diff --git a/library/ssl_msg.c b/library/ssl_msg.c index 8274240d2a..bed3e52d1f 100644 --- a/library/ssl_msg.c +++ b/library/ssl_msg.c @@ -1,5 +1,3 @@ -#if 0 - /* * SSLv3/TLSv1 shared functions * @@ -166,99 +164,6 @@ exit: #if defined(MBEDTLS_SSL_PROTO_DTLS) -#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) -/* Top-level Connection ID API */ - -int mbedtls_ssl_conf_cid( mbedtls_ssl_config *conf, - size_t len, - int ignore_other_cid ) -{ - if( len > MBEDTLS_SSL_CID_IN_LEN_MAX ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - if( ignore_other_cid != MBEDTLS_SSL_UNEXPECTED_CID_FAIL && - ignore_other_cid != MBEDTLS_SSL_UNEXPECTED_CID_IGNORE ) - { - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - - conf->ignore_unexpected_cid = ignore_other_cid; - conf->cid_len = len; - return( 0 ); -} - -int mbedtls_ssl_set_cid( mbedtls_ssl_context *ssl, - int enable, - unsigned char const *own_cid, - size_t own_cid_len ) -{ - if( ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - ssl->negotiate_cid = enable; - if( enable == MBEDTLS_SSL_CID_DISABLED ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "Disable use of CID extension." ) ); - return( 0 ); - } - MBEDTLS_SSL_DEBUG_MSG( 3, ( "Enable use of CID extension." ) ); - MBEDTLS_SSL_DEBUG_BUF( 3, "Own CID", own_cid, own_cid_len ); - - if( own_cid_len != ssl->conf->cid_len ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "CID length %u does not match CID length %u in config", - (unsigned) own_cid_len, - (unsigned) ssl->conf->cid_len ) ); - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - - memcpy( ssl->own_cid, own_cid, own_cid_len ); - /* Truncation is not an issue here because - * MBEDTLS_SSL_CID_IN_LEN_MAX at most 255. */ - ssl->own_cid_len = (uint8_t) own_cid_len; - - return( 0 ); -} - -int mbedtls_ssl_get_peer_cid( mbedtls_ssl_context *ssl, - int *enabled, - unsigned char peer_cid[ MBEDTLS_SSL_CID_OUT_LEN_MAX ], - size_t *peer_cid_len ) -{ - *enabled = MBEDTLS_SSL_CID_DISABLED; - - if( ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM || - ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER ) - { - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - - /* We report MBEDTLS_SSL_CID_DISABLED in case the CID extensions - * were used, but client and server requested the empty CID. - * This is indistinguishable from not using the CID extension - * in the first place. */ - if( ssl->transform_in->in_cid_len == 0 && - ssl->transform_in->out_cid_len == 0 ) - { - return( 0 ); - } - - if( peer_cid_len != NULL ) - { - *peer_cid_len = ssl->transform_in->out_cid_len; - if( peer_cid != NULL ) - { - memcpy( peer_cid, ssl->transform_in->out_cid, - ssl->transform_in->out_cid_len ); - } - } - - *enabled = MBEDTLS_SSL_CID_ENABLED; - - return( 0 ); -} -#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ - /* Forward declarations for functions related to message buffering. */ static void ssl_buffering_free_slot( mbedtls_ssl_context *ssl, uint8_t slot ); @@ -390,93 +295,6 @@ static void ssl_reset_retransmit_timeout( mbedtls_ssl_context *ssl ) } #endif /* MBEDTLS_SSL_PROTO_DTLS */ -#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) -/* - * Convert max_fragment_length codes to length. - * RFC 6066 says: - * enum{ - * 2^9(1), 2^10(2), 2^11(3), 2^12(4), (255) - * } MaxFragmentLength; - * and we add 0 -> extension unused - */ -static unsigned int ssl_mfl_code_to_length( int mfl ) -{ - switch( mfl ) - { - case MBEDTLS_SSL_MAX_FRAG_LEN_NONE: - return ( MBEDTLS_TLS_EXT_ADV_CONTENT_LEN ); - case MBEDTLS_SSL_MAX_FRAG_LEN_512: - return 512; - case MBEDTLS_SSL_MAX_FRAG_LEN_1024: - return 1024; - case MBEDTLS_SSL_MAX_FRAG_LEN_2048: - return 2048; - case MBEDTLS_SSL_MAX_FRAG_LEN_4096: - return 4096; - default: - return ( MBEDTLS_TLS_EXT_ADV_CONTENT_LEN ); - } -} -#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */ - -int mbedtls_ssl_session_copy( mbedtls_ssl_session *dst, - const mbedtls_ssl_session *src ) -{ - mbedtls_ssl_session_free( dst ); - memcpy( dst, src, sizeof( mbedtls_ssl_session ) ); - -#if defined(MBEDTLS_X509_CRT_PARSE_C) - -#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) - if( src->peer_cert != NULL ) - { - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - - dst->peer_cert = mbedtls_calloc( 1, sizeof(mbedtls_x509_crt) ); - if( dst->peer_cert == NULL ) - return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); - - mbedtls_x509_crt_init( dst->peer_cert ); - - if( ( ret = mbedtls_x509_crt_parse_der( dst->peer_cert, src->peer_cert->raw.p, - src->peer_cert->raw.len ) ) != 0 ) - { - mbedtls_free( dst->peer_cert ); - dst->peer_cert = NULL; - return( ret ); - } - } -#else /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ - if( src->peer_cert_digest != NULL ) - { - dst->peer_cert_digest = - mbedtls_calloc( 1, src->peer_cert_digest_len ); - if( dst->peer_cert_digest == NULL ) - return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); - - memcpy( dst->peer_cert_digest, src->peer_cert_digest, - src->peer_cert_digest_len ); - dst->peer_cert_digest_type = src->peer_cert_digest_type; - dst->peer_cert_digest_len = src->peer_cert_digest_len; - } -#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ - -#endif /* MBEDTLS_X509_CRT_PARSE_C */ - -#if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C) - if( src->ticket != NULL ) - { - dst->ticket = mbedtls_calloc( 1, src->ticket_len ); - if( dst->ticket == NULL ) - return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); - - memcpy( dst->ticket, src->ticket, src->ticket_len ); - } -#endif /* MBEDTLS_SSL_SESSION_TICKETS && MBEDTLS_SSL_CLI_C */ - - return( 0 ); -} - #if defined(MBEDTLS_SSL_HW_RECORD_ACCEL) int (*mbedtls_ssl_hw_record_init)( mbedtls_ssl_context *ssl, const unsigned char *key_enc, const unsigned char *key_dec, @@ -492,1749 +310,6 @@ int (*mbedtls_ssl_hw_record_read)( mbedtls_ssl_context *ssl ) = NULL; int (*mbedtls_ssl_hw_record_finish)( mbedtls_ssl_context *ssl ) = NULL; #endif /* MBEDTLS_SSL_HW_RECORD_ACCEL */ -/* - * Key material generation - */ -#if defined(MBEDTLS_SSL_PROTO_SSL3) -static int ssl3_prf( const unsigned char *secret, size_t slen, - const char *label, - const unsigned char *random, size_t rlen, - unsigned char *dstbuf, size_t dlen ) -{ - int ret = 0; - size_t i; - mbedtls_md5_context md5; - mbedtls_sha1_context sha1; - unsigned char padding[16]; - unsigned char sha1sum[20]; - ((void)label); - - mbedtls_md5_init( &md5 ); - mbedtls_sha1_init( &sha1 ); - - /* - * SSLv3: - * block = - * MD5( secret + SHA1( 'A' + secret + random ) ) + - * MD5( secret + SHA1( 'BB' + secret + random ) ) + - * MD5( secret + SHA1( 'CCC' + secret + random ) ) + - * ... - */ - for( i = 0; i < dlen / 16; i++ ) - { - memset( padding, (unsigned char) ('A' + i), 1 + i ); - - if( ( ret = mbedtls_sha1_starts_ret( &sha1 ) ) != 0 ) - goto exit; - if( ( ret = mbedtls_sha1_update_ret( &sha1, padding, 1 + i ) ) != 0 ) - goto exit; - if( ( ret = mbedtls_sha1_update_ret( &sha1, secret, slen ) ) != 0 ) - goto exit; - if( ( ret = mbedtls_sha1_update_ret( &sha1, random, rlen ) ) != 0 ) - goto exit; - if( ( ret = mbedtls_sha1_finish_ret( &sha1, sha1sum ) ) != 0 ) - goto exit; - - if( ( ret = mbedtls_md5_starts_ret( &md5 ) ) != 0 ) - goto exit; - if( ( ret = mbedtls_md5_update_ret( &md5, secret, slen ) ) != 0 ) - goto exit; - if( ( ret = mbedtls_md5_update_ret( &md5, sha1sum, 20 ) ) != 0 ) - goto exit; - if( ( ret = mbedtls_md5_finish_ret( &md5, dstbuf + i * 16 ) ) != 0 ) - goto exit; - } - -exit: - mbedtls_md5_free( &md5 ); - mbedtls_sha1_free( &sha1 ); - - mbedtls_platform_zeroize( padding, sizeof( padding ) ); - mbedtls_platform_zeroize( sha1sum, sizeof( sha1sum ) ); - - return( ret ); -} -#endif /* MBEDTLS_SSL_PROTO_SSL3 */ - -#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) -static int tls1_prf( const unsigned char *secret, size_t slen, - const char *label, - const unsigned char *random, size_t rlen, - unsigned char *dstbuf, size_t dlen ) -{ - size_t nb, hs; - size_t i, j, k; - const unsigned char *S1, *S2; - unsigned char *tmp; - size_t tmp_len = 0; - unsigned char h_i[20]; - const mbedtls_md_info_t *md_info; - mbedtls_md_context_t md_ctx; - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - - mbedtls_md_init( &md_ctx ); - - tmp_len = 20 + strlen( label ) + rlen; - tmp = mbedtls_calloc( 1, tmp_len ); - if( tmp == NULL ) - { - ret = MBEDTLS_ERR_SSL_ALLOC_FAILED; - goto exit; - } - - hs = ( slen + 1 ) / 2; - S1 = secret; - S2 = secret + slen - hs; - - nb = strlen( label ); - memcpy( tmp + 20, label, nb ); - memcpy( tmp + 20 + nb, random, rlen ); - nb += rlen; - - /* - * First compute P_md5(secret,label+random)[0..dlen] - */ - if( ( md_info = mbedtls_md_info_from_type( MBEDTLS_MD_MD5 ) ) == NULL ) - { - ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR; - goto exit; - } - - if( ( ret = mbedtls_md_setup( &md_ctx, md_info, 1 ) ) != 0 ) - { - goto exit; - } - - mbedtls_md_hmac_starts( &md_ctx, S1, hs ); - mbedtls_md_hmac_update( &md_ctx, tmp + 20, nb ); - mbedtls_md_hmac_finish( &md_ctx, 4 + tmp ); - - for( i = 0; i < dlen; i += 16 ) - { - mbedtls_md_hmac_reset ( &md_ctx ); - mbedtls_md_hmac_update( &md_ctx, 4 + tmp, 16 + nb ); - mbedtls_md_hmac_finish( &md_ctx, h_i ); - - mbedtls_md_hmac_reset ( &md_ctx ); - mbedtls_md_hmac_update( &md_ctx, 4 + tmp, 16 ); - mbedtls_md_hmac_finish( &md_ctx, 4 + tmp ); - - k = ( i + 16 > dlen ) ? dlen % 16 : 16; - - for( j = 0; j < k; j++ ) - dstbuf[i + j] = h_i[j]; - } - - mbedtls_md_free( &md_ctx ); - - /* - * XOR out with P_sha1(secret,label+random)[0..dlen] - */ - if( ( md_info = mbedtls_md_info_from_type( MBEDTLS_MD_SHA1 ) ) == NULL ) - { - ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR; - goto exit; - } - - if( ( ret = mbedtls_md_setup( &md_ctx, md_info, 1 ) ) != 0 ) - { - goto exit; - } - - mbedtls_md_hmac_starts( &md_ctx, S2, hs ); - mbedtls_md_hmac_update( &md_ctx, tmp + 20, nb ); - mbedtls_md_hmac_finish( &md_ctx, tmp ); - - for( i = 0; i < dlen; i += 20 ) - { - mbedtls_md_hmac_reset ( &md_ctx ); - mbedtls_md_hmac_update( &md_ctx, tmp, 20 + nb ); - mbedtls_md_hmac_finish( &md_ctx, h_i ); - - mbedtls_md_hmac_reset ( &md_ctx ); - mbedtls_md_hmac_update( &md_ctx, tmp, 20 ); - mbedtls_md_hmac_finish( &md_ctx, tmp ); - - k = ( i + 20 > dlen ) ? dlen % 20 : 20; - - for( j = 0; j < k; j++ ) - dstbuf[i + j] = (unsigned char)( dstbuf[i + j] ^ h_i[j] ); - } - -exit: - mbedtls_md_free( &md_ctx ); - - mbedtls_platform_zeroize( tmp, tmp_len ); - mbedtls_platform_zeroize( h_i, sizeof( h_i ) ); - - mbedtls_free( tmp ); - return( ret ); -} -#endif /* MBEDTLS_SSL_PROTO_TLS1) || MBEDTLS_SSL_PROTO_TLS1_1 */ - -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) -#if defined(MBEDTLS_USE_PSA_CRYPTO) - -static psa_status_t setup_psa_key_derivation( psa_key_derivation_operation_t* derivation, - psa_key_handle_t slot, - psa_algorithm_t alg, - const unsigned char* seed, size_t seed_length, - const unsigned char* label, size_t label_length, - size_t capacity ) -{ - psa_status_t status; - - status = psa_key_derivation_setup( derivation, alg ); - if( status != PSA_SUCCESS ) - return( status ); - - if( PSA_ALG_IS_TLS12_PRF( alg ) || PSA_ALG_IS_TLS12_PSK_TO_MS( alg ) ) - { - status = psa_key_derivation_input_bytes( derivation, - PSA_KEY_DERIVATION_INPUT_SEED, - seed, seed_length ); - if( status != PSA_SUCCESS ) - return( status ); - - if( slot == 0 ) - { - status = psa_key_derivation_input_bytes( - derivation, PSA_KEY_DERIVATION_INPUT_SECRET, - NULL, 0 ); - } - else - { - status = psa_key_derivation_input_key( - derivation, PSA_KEY_DERIVATION_INPUT_SECRET, - slot ); - } - if( status != PSA_SUCCESS ) - return( status ); - - status = psa_key_derivation_input_bytes( derivation, - PSA_KEY_DERIVATION_INPUT_LABEL, - label, label_length ); - if( status != PSA_SUCCESS ) - return( status ); - } - else - { - return( PSA_ERROR_NOT_SUPPORTED ); - } - - status = psa_key_derivation_set_capacity( derivation, capacity ); - if( status != PSA_SUCCESS ) - return( status ); - - return( PSA_SUCCESS ); -} - -static int tls_prf_generic( mbedtls_md_type_t md_type, - const unsigned char *secret, size_t slen, - const char *label, - const unsigned char *random, size_t rlen, - unsigned char *dstbuf, size_t dlen ) -{ - psa_status_t status; - psa_algorithm_t alg; - psa_key_handle_t master_slot = 0; - psa_key_derivation_operation_t derivation = - PSA_KEY_DERIVATION_OPERATION_INIT; - - if( md_type == MBEDTLS_MD_SHA384 ) - alg = PSA_ALG_TLS12_PRF(PSA_ALG_SHA_384); - else - alg = PSA_ALG_TLS12_PRF(PSA_ALG_SHA_256); - - /* Normally a "secret" should be long enough to be impossible to - * find by brute force, and in particular should not be empty. But - * this PRF is also used to derive an IV, in particular in EAP-TLS, - * and for this use case it makes sense to have a 0-length "secret". - * Since the key API doesn't allow importing a key of length 0, - * keep master_slot=0, which setup_psa_key_derivation() understands - * to mean a 0-length "secret" input. */ - if( slen != 0 ) - { - psa_key_attributes_t key_attributes = psa_key_attributes_init(); - psa_set_key_usage_flags( &key_attributes, PSA_KEY_USAGE_DERIVE ); - psa_set_key_algorithm( &key_attributes, alg ); - psa_set_key_type( &key_attributes, PSA_KEY_TYPE_DERIVE ); - - status = psa_import_key( &key_attributes, secret, slen, &master_slot ); - if( status != PSA_SUCCESS ) - return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED ); - } - - status = setup_psa_key_derivation( &derivation, - master_slot, alg, - random, rlen, - (unsigned char const *) label, - (size_t) strlen( label ), - dlen ); - if( status != PSA_SUCCESS ) - { - psa_key_derivation_abort( &derivation ); - psa_destroy_key( master_slot ); - return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED ); - } - - status = psa_key_derivation_output_bytes( &derivation, dstbuf, dlen ); - if( status != PSA_SUCCESS ) - { - psa_key_derivation_abort( &derivation ); - psa_destroy_key( master_slot ); - return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED ); - } - - status = psa_key_derivation_abort( &derivation ); - if( status != PSA_SUCCESS ) - { - psa_destroy_key( master_slot ); - return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED ); - } - - if( master_slot != 0 ) - status = psa_destroy_key( master_slot ); - if( status != PSA_SUCCESS ) - return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED ); - - return( 0 ); -} - -#else /* MBEDTLS_USE_PSA_CRYPTO */ - -static int tls_prf_generic( mbedtls_md_type_t md_type, - const unsigned char *secret, size_t slen, - const char *label, - const unsigned char *random, size_t rlen, - unsigned char *dstbuf, size_t dlen ) -{ - size_t nb; - size_t i, j, k, md_len; - unsigned char *tmp; - size_t tmp_len = 0; - unsigned char h_i[MBEDTLS_MD_MAX_SIZE]; - const mbedtls_md_info_t *md_info; - mbedtls_md_context_t md_ctx; - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - - mbedtls_md_init( &md_ctx ); - - if( ( md_info = mbedtls_md_info_from_type( md_type ) ) == NULL ) - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - - md_len = mbedtls_md_get_size( md_info ); - - tmp_len = md_len + strlen( label ) + rlen; - tmp = mbedtls_calloc( 1, tmp_len ); - if( tmp == NULL ) - { - ret = MBEDTLS_ERR_SSL_ALLOC_FAILED; - goto exit; - } - - nb = strlen( label ); - memcpy( tmp + md_len, label, nb ); - memcpy( tmp + md_len + nb, random, rlen ); - nb += rlen; - - /* - * Compute P_(secret, label + random)[0..dlen] - */ - if ( ( ret = mbedtls_md_setup( &md_ctx, md_info, 1 ) ) != 0 ) - goto exit; - - mbedtls_md_hmac_starts( &md_ctx, secret, slen ); - mbedtls_md_hmac_update( &md_ctx, tmp + md_len, nb ); - mbedtls_md_hmac_finish( &md_ctx, tmp ); - - for( i = 0; i < dlen; i += md_len ) - { - mbedtls_md_hmac_reset ( &md_ctx ); - mbedtls_md_hmac_update( &md_ctx, tmp, md_len + nb ); - mbedtls_md_hmac_finish( &md_ctx, h_i ); - - mbedtls_md_hmac_reset ( &md_ctx ); - mbedtls_md_hmac_update( &md_ctx, tmp, md_len ); - mbedtls_md_hmac_finish( &md_ctx, tmp ); - - k = ( i + md_len > dlen ) ? dlen % md_len : md_len; - - for( j = 0; j < k; j++ ) - dstbuf[i + j] = h_i[j]; - } - -exit: - mbedtls_md_free( &md_ctx ); - - mbedtls_platform_zeroize( tmp, tmp_len ); - mbedtls_platform_zeroize( h_i, sizeof( h_i ) ); - - mbedtls_free( tmp ); - - return( ret ); -} -#endif /* MBEDTLS_USE_PSA_CRYPTO */ -#if defined(MBEDTLS_SHA256_C) -static int tls_prf_sha256( const unsigned char *secret, size_t slen, - const char *label, - const unsigned char *random, size_t rlen, - unsigned char *dstbuf, size_t dlen ) -{ - return( tls_prf_generic( MBEDTLS_MD_SHA256, secret, slen, - label, random, rlen, dstbuf, dlen ) ); -} -#endif /* MBEDTLS_SHA256_C */ - -#if defined(MBEDTLS_SHA512_C) -static int tls_prf_sha384( const unsigned char *secret, size_t slen, - const char *label, - const unsigned char *random, size_t rlen, - unsigned char *dstbuf, size_t dlen ) -{ - return( tls_prf_generic( MBEDTLS_MD_SHA384, secret, slen, - label, random, rlen, dstbuf, dlen ) ); -} -#endif /* MBEDTLS_SHA512_C */ -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ - -static void ssl_update_checksum_start( mbedtls_ssl_context *, const unsigned char *, size_t ); - -#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \ - defined(MBEDTLS_SSL_PROTO_TLS1_1) -static void ssl_update_checksum_md5sha1( mbedtls_ssl_context *, const unsigned char *, size_t ); -#endif - -#if defined(MBEDTLS_SSL_PROTO_SSL3) -static void ssl_calc_verify_ssl( const mbedtls_ssl_context *, unsigned char *, size_t * ); -static void ssl_calc_finished_ssl( mbedtls_ssl_context *, unsigned char *, int ); -#endif - -#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) -static void ssl_calc_verify_tls( const mbedtls_ssl_context *, unsigned char *, size_t * ); -static void ssl_calc_finished_tls( mbedtls_ssl_context *, unsigned char *, int ); -#endif - -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) -#if defined(MBEDTLS_SHA256_C) -static void ssl_update_checksum_sha256( mbedtls_ssl_context *, const unsigned char *, size_t ); -static void ssl_calc_verify_tls_sha256( const mbedtls_ssl_context *,unsigned char *, size_t * ); -static void ssl_calc_finished_tls_sha256( mbedtls_ssl_context *,unsigned char *, int ); -#endif - -#if defined(MBEDTLS_SHA512_C) -static void ssl_update_checksum_sha384( mbedtls_ssl_context *, const unsigned char *, size_t ); -static void ssl_calc_verify_tls_sha384( const mbedtls_ssl_context *, unsigned char *, size_t * ); -static void ssl_calc_finished_tls_sha384( mbedtls_ssl_context *, unsigned char *, int ); -#endif -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ - -#if defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED) && \ - defined(MBEDTLS_USE_PSA_CRYPTO) -static int ssl_use_opaque_psk( mbedtls_ssl_context const *ssl ) -{ - if( ssl->conf->f_psk != NULL ) - { - /* If we've used a callback to select the PSK, - * the static configuration is irrelevant. */ - if( ssl->handshake->psk_opaque != 0 ) - return( 1 ); - - return( 0 ); - } - - if( ssl->conf->psk_opaque != 0 ) - return( 1 ); - - return( 0 ); -} -#endif /* MBEDTLS_USE_PSA_CRYPTO && - MBEDTLS_KEY_EXCHANGE_PSK_ENABLED */ - -#if defined(MBEDTLS_SSL_EXPORT_KEYS) -static mbedtls_tls_prf_types tls_prf_get_type( mbedtls_ssl_tls_prf_cb *tls_prf ) -{ -#if defined(MBEDTLS_SSL_PROTO_SSL3) - if( tls_prf == ssl3_prf ) - { - return( MBEDTLS_SSL_TLS_PRF_SSL3 ); - } - else -#endif -#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) - if( tls_prf == tls1_prf ) - { - return( MBEDTLS_SSL_TLS_PRF_TLS1 ); - } - else -#endif -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) -#if defined(MBEDTLS_SHA512_C) - if( tls_prf == tls_prf_sha384 ) - { - return( MBEDTLS_SSL_TLS_PRF_SHA384 ); - } - else -#endif -#if defined(MBEDTLS_SHA256_C) - if( tls_prf == tls_prf_sha256 ) - { - return( MBEDTLS_SSL_TLS_PRF_SHA256 ); - } - else -#endif -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ - return( MBEDTLS_SSL_TLS_PRF_NONE ); -} -#endif /* MBEDTLS_SSL_EXPORT_KEYS */ - -int mbedtls_ssl_tls_prf( const mbedtls_tls_prf_types prf, - const unsigned char *secret, size_t slen, - const char *label, - const unsigned char *random, size_t rlen, - unsigned char *dstbuf, size_t dlen ) -{ - mbedtls_ssl_tls_prf_cb *tls_prf = NULL; - - switch( prf ) - { -#if defined(MBEDTLS_SSL_PROTO_SSL3) - case MBEDTLS_SSL_TLS_PRF_SSL3: - tls_prf = ssl3_prf; - break; -#endif /* MBEDTLS_SSL_PROTO_SSL3 */ -#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) - case MBEDTLS_SSL_TLS_PRF_TLS1: - tls_prf = tls1_prf; - break; -#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 */ - -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) -#if defined(MBEDTLS_SHA512_C) - case MBEDTLS_SSL_TLS_PRF_SHA384: - tls_prf = tls_prf_sha384; - break; -#endif /* MBEDTLS_SHA512_C */ -#if defined(MBEDTLS_SHA256_C) - case MBEDTLS_SSL_TLS_PRF_SHA256: - tls_prf = tls_prf_sha256; - break; -#endif /* MBEDTLS_SHA256_C */ -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ - default: - return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE ); - } - - return( tls_prf( secret, slen, label, random, rlen, dstbuf, dlen ) ); -} - -/* Type for the TLS PRF */ -typedef int ssl_tls_prf_t(const unsigned char *, size_t, const char *, - const unsigned char *, size_t, - unsigned char *, size_t); - -/* - * Populate a transform structure with session keys and all the other - * necessary information. - * - * Parameters: - * - [in/out]: transform: structure to populate - * [in] must be just initialised with mbedtls_ssl_transform_init() - * [out] fully populated, ready for use by mbedtls_ssl_{en,de}crypt_buf() - * - [in] ciphersuite - * - [in] master - * - [in] encrypt_then_mac - * - [in] trunc_hmac - * - [in] compression - * - [in] tls_prf: pointer to PRF to use for key derivation - * - [in] randbytes: buffer holding ServerHello.random + ClientHello.random - * - [in] minor_ver: SSL/TLS minor version - * - [in] endpoint: client or server - * - [in] ssl: optionally used for: - * - MBEDTLS_SSL_HW_RECORD_ACCEL: whole context - * - MBEDTLS_SSL_EXPORT_KEYS: ssl->conf->{f,p}_export_keys - * - MBEDTLS_DEBUG_C: ssl->conf->{f,p}_dbg - */ -static int ssl_populate_transform( mbedtls_ssl_transform *transform, - int ciphersuite, - const unsigned char master[48], -#if defined(MBEDTLS_SSL_SOME_MODES_USE_MAC) -#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) - int encrypt_then_mac, -#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */ -#if defined(MBEDTLS_SSL_TRUNCATED_HMAC) - int trunc_hmac, -#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */ -#endif /* MBEDTLS_SSL_SOME_MODES_USE_MAC */ -#if defined(MBEDTLS_ZLIB_SUPPORT) - int compression, -#endif - ssl_tls_prf_t tls_prf, - const unsigned char randbytes[64], - int minor_ver, - unsigned endpoint, - const mbedtls_ssl_context *ssl ) -{ - int ret = 0; -#if defined(MBEDTLS_USE_PSA_CRYPTO) - int psa_fallthrough; -#endif /* MBEDTLS_USE_PSA_CRYPTO */ - unsigned char keyblk[256]; - unsigned char *key1; - unsigned char *key2; - unsigned char *mac_enc; - unsigned char *mac_dec; - size_t mac_key_len; - size_t iv_copy_len; - unsigned keylen; - const mbedtls_ssl_ciphersuite_t *ciphersuite_info; - const mbedtls_cipher_info_t *cipher_info; - const mbedtls_md_info_t *md_info; - -#if !defined(MBEDTLS_SSL_HW_RECORD_ACCEL) && \ - !defined(MBEDTLS_SSL_EXPORT_KEYS) && \ - !defined(MBEDTLS_DEBUG_C) - ssl = NULL; /* make sure we don't use it except for those cases */ - (void) ssl; -#endif - - /* - * Some data just needs copying into the structure - */ -#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) && \ - defined(MBEDTLS_SSL_SOME_MODES_USE_MAC) - transform->encrypt_then_mac = encrypt_then_mac; -#endif - transform->minor_ver = minor_ver; - -#if defined(MBEDTLS_SSL_CONTEXT_SERIALIZATION) - memcpy( transform->randbytes, randbytes, sizeof( transform->randbytes ) ); -#endif - - /* - * Get various info structures - */ - ciphersuite_info = mbedtls_ssl_ciphersuite_from_id( ciphersuite ); - if( ciphersuite_info == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "ciphersuite info for %d not found", - ciphersuite ) ); - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - - cipher_info = mbedtls_cipher_info_from_type( ciphersuite_info->cipher ); - if( cipher_info == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "cipher info for %d not found", - ciphersuite_info->cipher ) ); - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - - md_info = mbedtls_md_info_from_type( ciphersuite_info->mac ); - if( md_info == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "mbedtls_md info for %d not found", - ciphersuite_info->mac ) ); - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - -#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) - /* Copy own and peer's CID if the use of the CID - * extension has been negotiated. */ - if( ssl->handshake->cid_in_use == MBEDTLS_SSL_CID_ENABLED ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "Copy CIDs into SSL transform" ) ); - - transform->in_cid_len = ssl->own_cid_len; - memcpy( transform->in_cid, ssl->own_cid, ssl->own_cid_len ); - MBEDTLS_SSL_DEBUG_BUF( 3, "Incoming CID", transform->in_cid, - transform->in_cid_len ); - - transform->out_cid_len = ssl->handshake->peer_cid_len; - memcpy( transform->out_cid, ssl->handshake->peer_cid, - ssl->handshake->peer_cid_len ); - MBEDTLS_SSL_DEBUG_BUF( 3, "Outgoing CID", transform->out_cid, - transform->out_cid_len ); - } -#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ - - /* - * Compute key block using the PRF - */ - ret = tls_prf( master, 48, "key expansion", randbytes, 64, keyblk, 256 ); - if( ret != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "prf", ret ); - return( ret ); - } - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite = %s", - mbedtls_ssl_get_ciphersuite_name( ciphersuite ) ) ); - MBEDTLS_SSL_DEBUG_BUF( 3, "master secret", master, 48 ); - MBEDTLS_SSL_DEBUG_BUF( 4, "random bytes", randbytes, 64 ); - MBEDTLS_SSL_DEBUG_BUF( 4, "key block", keyblk, 256 ); - - /* - * Determine the appropriate key, IV and MAC length. - */ - - keylen = cipher_info->key_bitlen / 8; - -#if defined(MBEDTLS_GCM_C) || \ - defined(MBEDTLS_CCM_C) || \ - defined(MBEDTLS_CHACHAPOLY_C) - if( cipher_info->mode == MBEDTLS_MODE_GCM || - cipher_info->mode == MBEDTLS_MODE_CCM || - cipher_info->mode == MBEDTLS_MODE_CHACHAPOLY ) - { - size_t explicit_ivlen; - - transform->maclen = 0; - mac_key_len = 0; - transform->taglen = - ciphersuite_info->flags & MBEDTLS_CIPHERSUITE_SHORT_TAG ? 8 : 16; - - /* All modes haves 96-bit IVs; - * GCM and CCM has 4 implicit and 8 explicit bytes - * ChachaPoly has all 12 bytes implicit - */ - transform->ivlen = 12; - if( cipher_info->mode == MBEDTLS_MODE_CHACHAPOLY ) - transform->fixed_ivlen = 12; - else - transform->fixed_ivlen = 4; - - /* Minimum length of encrypted record */ - explicit_ivlen = transform->ivlen - transform->fixed_ivlen; - transform->minlen = explicit_ivlen + transform->taglen; - } - else -#endif /* MBEDTLS_GCM_C || MBEDTLS_CCM_C || MBEDTLS_CHACHAPOLY_C */ -#if defined(MBEDTLS_SSL_SOME_MODES_USE_MAC) - if( cipher_info->mode == MBEDTLS_MODE_STREAM || - cipher_info->mode == MBEDTLS_MODE_CBC ) - { - /* Initialize HMAC contexts */ - if( ( ret = mbedtls_md_setup( &transform->md_ctx_enc, md_info, 1 ) ) != 0 || - ( ret = mbedtls_md_setup( &transform->md_ctx_dec, md_info, 1 ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md_setup", ret ); - goto end; - } - - /* Get MAC length */ - mac_key_len = mbedtls_md_get_size( md_info ); - transform->maclen = mac_key_len; - -#if defined(MBEDTLS_SSL_TRUNCATED_HMAC) - /* - * If HMAC is to be truncated, we shall keep the leftmost bytes, - * (rfc 6066 page 13 or rfc 2104 section 4), - * so we only need to adjust the length here. - */ - if( trunc_hmac == MBEDTLS_SSL_TRUNC_HMAC_ENABLED ) - { - transform->maclen = MBEDTLS_SSL_TRUNCATED_HMAC_LEN; - -#if defined(MBEDTLS_SSL_TRUNCATED_HMAC_COMPAT) - /* Fall back to old, non-compliant version of the truncated - * HMAC implementation which also truncates the key - * (Mbed TLS versions from 1.3 to 2.6.0) */ - mac_key_len = transform->maclen; -#endif - } -#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */ - - /* IV length */ - transform->ivlen = cipher_info->iv_size; - - /* Minimum length */ - if( cipher_info->mode == MBEDTLS_MODE_STREAM ) - transform->minlen = transform->maclen; - else - { - /* - * GenericBlockCipher: - * 1. if EtM is in use: one block plus MAC - * otherwise: * first multiple of blocklen greater than maclen - * 2. IV except for SSL3 and TLS 1.0 - */ -#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) - if( encrypt_then_mac == MBEDTLS_SSL_ETM_ENABLED ) - { - transform->minlen = transform->maclen - + cipher_info->block_size; - } - else -#endif - { - transform->minlen = transform->maclen - + cipher_info->block_size - - transform->maclen % cipher_info->block_size; - } - -#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) - if( minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 || - minor_ver == MBEDTLS_SSL_MINOR_VERSION_1 ) - ; /* No need to adjust minlen */ - else -#endif -#if defined(MBEDTLS_SSL_PROTO_TLS1_1) || defined(MBEDTLS_SSL_PROTO_TLS1_2) - if( minor_ver == MBEDTLS_SSL_MINOR_VERSION_2 || - minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 ) - { - transform->minlen += transform->ivlen; - } - else -#endif - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR; - goto end; - } - } - } - else -#endif /* MBEDTLS_SSL_SOME_MODES_USE_MAC */ - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "keylen: %u, minlen: %u, ivlen: %u, maclen: %u", - (unsigned) keylen, - (unsigned) transform->minlen, - (unsigned) transform->ivlen, - (unsigned) transform->maclen ) ); - - /* - * Finally setup the cipher contexts, IVs and MAC secrets. - */ -#if defined(MBEDTLS_SSL_CLI_C) - if( endpoint == MBEDTLS_SSL_IS_CLIENT ) - { - key1 = keyblk + mac_key_len * 2; - key2 = keyblk + mac_key_len * 2 + keylen; - - mac_enc = keyblk; - mac_dec = keyblk + mac_key_len; - - /* - * This is not used in TLS v1.1. - */ - iv_copy_len = ( transform->fixed_ivlen ) ? - transform->fixed_ivlen : transform->ivlen; - memcpy( transform->iv_enc, key2 + keylen, iv_copy_len ); - memcpy( transform->iv_dec, key2 + keylen + iv_copy_len, - iv_copy_len ); - } - else -#endif /* MBEDTLS_SSL_CLI_C */ -#if defined(MBEDTLS_SSL_SRV_C) - if( endpoint == MBEDTLS_SSL_IS_SERVER ) - { - key1 = keyblk + mac_key_len * 2 + keylen; - key2 = keyblk + mac_key_len * 2; - - mac_enc = keyblk + mac_key_len; - mac_dec = keyblk; - - /* - * This is not used in TLS v1.1. - */ - iv_copy_len = ( transform->fixed_ivlen ) ? - transform->fixed_ivlen : transform->ivlen; - memcpy( transform->iv_dec, key1 + keylen, iv_copy_len ); - memcpy( transform->iv_enc, key1 + keylen + iv_copy_len, - iv_copy_len ); - } - else -#endif /* MBEDTLS_SSL_SRV_C */ - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR; - goto end; - } - -#if defined(MBEDTLS_SSL_SOME_MODES_USE_MAC) -#if defined(MBEDTLS_SSL_PROTO_SSL3) - if( minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) - { - if( mac_key_len > sizeof( transform->mac_enc ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR; - goto end; - } - - memcpy( transform->mac_enc, mac_enc, mac_key_len ); - memcpy( transform->mac_dec, mac_dec, mac_key_len ); - } - else -#endif /* MBEDTLS_SSL_PROTO_SSL3 */ -#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \ - defined(MBEDTLS_SSL_PROTO_TLS1_2) - if( minor_ver >= MBEDTLS_SSL_MINOR_VERSION_1 ) - { - /* For HMAC-based ciphersuites, initialize the HMAC transforms. - For AEAD-based ciphersuites, there is nothing to do here. */ - if( mac_key_len != 0 ) - { - mbedtls_md_hmac_starts( &transform->md_ctx_enc, mac_enc, mac_key_len ); - mbedtls_md_hmac_starts( &transform->md_ctx_dec, mac_dec, mac_key_len ); - } - } - else -#endif - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR; - goto end; - } -#endif /* MBEDTLS_SSL_SOME_MODES_USE_MAC */ - -#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL) - if( mbedtls_ssl_hw_record_init != NULL ) - { - int ret = 0; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "going for mbedtls_ssl_hw_record_init()" ) ); - - if( ( ret = mbedtls_ssl_hw_record_init( ssl, key1, key2, keylen, - transform->iv_enc, transform->iv_dec, - iv_copy_len, - mac_enc, mac_dec, - mac_key_len ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_init", ret ); - ret = MBEDTLS_ERR_SSL_HW_ACCEL_FAILED; - goto end; - } - } -#else - ((void) mac_dec); - ((void) mac_enc); -#endif /* MBEDTLS_SSL_HW_RECORD_ACCEL */ - -#if defined(MBEDTLS_SSL_EXPORT_KEYS) - if( ssl->conf->f_export_keys != NULL ) - { - ssl->conf->f_export_keys( ssl->conf->p_export_keys, - master, keyblk, - mac_key_len, keylen, - iv_copy_len ); - } - - if( ssl->conf->f_export_keys_ext != NULL ) - { - ssl->conf->f_export_keys_ext( ssl->conf->p_export_keys, - master, keyblk, - mac_key_len, keylen, - iv_copy_len, - randbytes + 32, - randbytes, - tls_prf_get_type( tls_prf ) ); - } -#endif - -#if defined(MBEDTLS_USE_PSA_CRYPTO) - - /* Only use PSA-based ciphers for TLS-1.2. - * That's relevant at least for TLS-1.0, where - * we assume that mbedtls_cipher_crypt() updates - * the structure field for the IV, which the PSA-based - * implementation currently doesn't. */ -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) - if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 ) - { - ret = mbedtls_cipher_setup_psa( &transform->cipher_ctx_enc, - cipher_info, transform->taglen ); - if( ret != 0 && ret != MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setup_psa", ret ); - goto end; - } - - if( ret == 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "Successfully setup PSA-based encryption cipher context" ) ); - psa_fallthrough = 0; - } - else - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "Failed to setup PSA-based cipher context for record encryption - fall through to default setup." ) ); - psa_fallthrough = 1; - } - } - else - psa_fallthrough = 1; -#else - psa_fallthrough = 1; -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ - - if( psa_fallthrough == 1 ) -#endif /* MBEDTLS_USE_PSA_CRYPTO */ - if( ( ret = mbedtls_cipher_setup( &transform->cipher_ctx_enc, - cipher_info ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setup", ret ); - goto end; - } - -#if defined(MBEDTLS_USE_PSA_CRYPTO) - /* Only use PSA-based ciphers for TLS-1.2. - * That's relevant at least for TLS-1.0, where - * we assume that mbedtls_cipher_crypt() updates - * the structure field for the IV, which the PSA-based - * implementation currently doesn't. */ -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) - if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 ) - { - ret = mbedtls_cipher_setup_psa( &transform->cipher_ctx_dec, - cipher_info, transform->taglen ); - if( ret != 0 && ret != MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setup_psa", ret ); - goto end; - } - - if( ret == 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "Successfully setup PSA-based decryption cipher context" ) ); - psa_fallthrough = 0; - } - else - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "Failed to setup PSA-based cipher context for record decryption - fall through to default setup." ) ); - psa_fallthrough = 1; - } - } - else - psa_fallthrough = 1; -#else - psa_fallthrough = 1; -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ - - if( psa_fallthrough == 1 ) -#endif /* MBEDTLS_USE_PSA_CRYPTO */ - if( ( ret = mbedtls_cipher_setup( &transform->cipher_ctx_dec, - cipher_info ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setup", ret ); - goto end; - } - - if( ( ret = mbedtls_cipher_setkey( &transform->cipher_ctx_enc, key1, - cipher_info->key_bitlen, - MBEDTLS_ENCRYPT ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setkey", ret ); - goto end; - } - - if( ( ret = mbedtls_cipher_setkey( &transform->cipher_ctx_dec, key2, - cipher_info->key_bitlen, - MBEDTLS_DECRYPT ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setkey", ret ); - goto end; - } - -#if defined(MBEDTLS_CIPHER_MODE_CBC) - if( cipher_info->mode == MBEDTLS_MODE_CBC ) - { - if( ( ret = mbedtls_cipher_set_padding_mode( &transform->cipher_ctx_enc, - MBEDTLS_PADDING_NONE ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_set_padding_mode", ret ); - goto end; - } - - if( ( ret = mbedtls_cipher_set_padding_mode( &transform->cipher_ctx_dec, - MBEDTLS_PADDING_NONE ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_set_padding_mode", ret ); - goto end; - } - } -#endif /* MBEDTLS_CIPHER_MODE_CBC */ - - - /* Initialize Zlib contexts */ -#if defined(MBEDTLS_ZLIB_SUPPORT) - if( compression == MBEDTLS_SSL_COMPRESS_DEFLATE ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "Initializing zlib states" ) ); - - memset( &transform->ctx_deflate, 0, sizeof( transform->ctx_deflate ) ); - memset( &transform->ctx_inflate, 0, sizeof( transform->ctx_inflate ) ); - - if( deflateInit( &transform->ctx_deflate, - Z_DEFAULT_COMPRESSION ) != Z_OK || - inflateInit( &transform->ctx_inflate ) != Z_OK ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "Failed to initialize compression" ) ); - ret = MBEDTLS_ERR_SSL_COMPRESSION_FAILED; - goto end; - } - } -#endif /* MBEDTLS_ZLIB_SUPPORT */ - -end: - mbedtls_platform_zeroize( keyblk, sizeof( keyblk ) ); - return( ret ); -} - -/* - * Set appropriate PRF function and other SSL / TLS 1.0/1.1 / TLS1.2 functions - * - * Inputs: - * - SSL/TLS minor version - * - hash associated with the ciphersuite (only used by TLS 1.2) - * - * Outputs: - * - the tls_prf, calc_verify and calc_finished members of handshake structure - */ -static int ssl_set_handshake_prfs( mbedtls_ssl_handshake_params *handshake, - int minor_ver, - mbedtls_md_type_t hash ) -{ -#if !defined(MBEDTLS_SSL_PROTO_TLS1_2) || !defined(MBEDTLS_SHA512_C) - (void) hash; -#endif - -#if defined(MBEDTLS_SSL_PROTO_SSL3) - if( minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) - { - handshake->tls_prf = ssl3_prf; - handshake->calc_verify = ssl_calc_verify_ssl; - handshake->calc_finished = ssl_calc_finished_ssl; - } - else -#endif -#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) - if( minor_ver < MBEDTLS_SSL_MINOR_VERSION_3 ) - { - handshake->tls_prf = tls1_prf; - handshake->calc_verify = ssl_calc_verify_tls; - handshake->calc_finished = ssl_calc_finished_tls; - } - else -#endif -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) -#if defined(MBEDTLS_SHA512_C) - if( minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 && - hash == MBEDTLS_MD_SHA384 ) - { - handshake->tls_prf = tls_prf_sha384; - handshake->calc_verify = ssl_calc_verify_tls_sha384; - handshake->calc_finished = ssl_calc_finished_tls_sha384; - } - else -#endif -#if defined(MBEDTLS_SHA256_C) - if( minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 ) - { - handshake->tls_prf = tls_prf_sha256; - handshake->calc_verify = ssl_calc_verify_tls_sha256; - handshake->calc_finished = ssl_calc_finished_tls_sha256; - } - else -#endif -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ - { - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - - return( 0 ); -} - -/* - * Compute master secret if needed - * - * Parameters: - * [in/out] handshake - * [in] resume, premaster, extended_ms, calc_verify, tls_prf - * (PSA-PSK) ciphersuite_info, psk_opaque - * [out] premaster (cleared) - * [out] master - * [in] ssl: optionally used for debugging, EMS and PSA-PSK - * debug: conf->f_dbg, conf->p_dbg - * EMS: passed to calc_verify (debug + (SSL3) session_negotiate) - * PSA-PSA: minor_ver, conf - */ -static int ssl_compute_master( mbedtls_ssl_handshake_params *handshake, - unsigned char *master, - const mbedtls_ssl_context *ssl ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - - /* cf. RFC 5246, Section 8.1: - * "The master secret is always exactly 48 bytes in length." */ - size_t const master_secret_len = 48; - -#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET) - unsigned char session_hash[48]; -#endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */ - - /* The label for the KDF used for key expansion. - * This is either "master secret" or "extended master secret" - * depending on whether the Extended Master Secret extension - * is used. */ - char const *lbl = "master secret"; - - /* The salt for the KDF used for key expansion. - * - If the Extended Master Secret extension is not used, - * this is ClientHello.Random + ServerHello.Random - * (see Sect. 8.1 in RFC 5246). - * - If the Extended Master Secret extension is used, - * this is the transcript of the handshake so far. - * (see Sect. 4 in RFC 7627). */ - unsigned char const *salt = handshake->randbytes; - size_t salt_len = 64; - -#if !defined(MBEDTLS_DEBUG_C) && \ - !defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET) && \ - !(defined(MBEDTLS_USE_PSA_CRYPTO) && \ - defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED)) - ssl = NULL; /* make sure we don't use it except for those cases */ - (void) ssl; -#endif - - if( handshake->resume != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "no premaster (session resumed)" ) ); - return( 0 ); - } - -#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET) - if( handshake->extended_ms == MBEDTLS_SSL_EXTENDED_MS_ENABLED ) - { - lbl = "extended master secret"; - salt = session_hash; - handshake->calc_verify( ssl, session_hash, &salt_len ); - - MBEDTLS_SSL_DEBUG_BUF( 3, "session hash for extended master secret", - session_hash, salt_len ); - } -#endif /* MBEDTLS_SSL_EXTENDED_MS_ENABLED */ - -#if defined(MBEDTLS_USE_PSA_CRYPTO) && \ - defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED) - if( handshake->ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK && - ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 && - ssl_use_opaque_psk( ssl ) == 1 ) - { - /* Perform PSK-to-MS expansion in a single step. */ - psa_status_t status; - psa_algorithm_t alg; - psa_key_handle_t psk; - psa_key_derivation_operation_t derivation = - PSA_KEY_DERIVATION_OPERATION_INIT; - mbedtls_md_type_t hash_alg = handshake->ciphersuite_info->mac; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "perform PSA-based PSK-to-MS expansion" ) ); - - psk = ssl->conf->psk_opaque; - if( handshake->psk_opaque != 0 ) - psk = handshake->psk_opaque; - - if( hash_alg == MBEDTLS_MD_SHA384 ) - alg = PSA_ALG_TLS12_PSK_TO_MS(PSA_ALG_SHA_384); - else - alg = PSA_ALG_TLS12_PSK_TO_MS(PSA_ALG_SHA_256); - - status = setup_psa_key_derivation( &derivation, psk, alg, - salt, salt_len, - (unsigned char const *) lbl, - (size_t) strlen( lbl ), - master_secret_len ); - if( status != PSA_SUCCESS ) - { - psa_key_derivation_abort( &derivation ); - return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED ); - } - - status = psa_key_derivation_output_bytes( &derivation, - master, - master_secret_len ); - if( status != PSA_SUCCESS ) - { - psa_key_derivation_abort( &derivation ); - return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED ); - } - - status = psa_key_derivation_abort( &derivation ); - if( status != PSA_SUCCESS ) - return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED ); - } - else -#endif - { - ret = handshake->tls_prf( handshake->premaster, handshake->pmslen, - lbl, salt, salt_len, - master, - master_secret_len ); - if( ret != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "prf", ret ); - return( ret ); - } - - MBEDTLS_SSL_DEBUG_BUF( 3, "premaster secret", - handshake->premaster, - handshake->pmslen ); - - mbedtls_platform_zeroize( handshake->premaster, - sizeof(handshake->premaster) ); - } - - return( 0 ); -} - -int mbedtls_ssl_derive_keys( mbedtls_ssl_context *ssl ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - const mbedtls_ssl_ciphersuite_t * const ciphersuite_info = - ssl->handshake->ciphersuite_info; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> derive keys" ) ); - - /* Set PRF, calc_verify and calc_finished function pointers */ - ret = ssl_set_handshake_prfs( ssl->handshake, - ssl->minor_ver, - ciphersuite_info->mac ); - if( ret != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "ssl_set_handshake_prfs", ret ); - return( ret ); - } - - /* Compute master secret if needed */ - ret = ssl_compute_master( ssl->handshake, - ssl->session_negotiate->master, - ssl ); - if( ret != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "ssl_compute_master", ret ); - return( ret ); - } - - /* Swap the client and server random values: - * - MS derivation wanted client+server (RFC 5246 8.1) - * - key derivation wants server+client (RFC 5246 6.3) */ - { - unsigned char tmp[64]; - memcpy( tmp, ssl->handshake->randbytes, 64 ); - memcpy( ssl->handshake->randbytes, tmp + 32, 32 ); - memcpy( ssl->handshake->randbytes + 32, tmp, 32 ); - mbedtls_platform_zeroize( tmp, sizeof( tmp ) ); - } - - /* Populate transform structure */ - ret = ssl_populate_transform( ssl->transform_negotiate, - ssl->session_negotiate->ciphersuite, - ssl->session_negotiate->master, -#if defined(MBEDTLS_SSL_SOME_MODES_USE_MAC) -#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) - ssl->session_negotiate->encrypt_then_mac, -#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */ -#if defined(MBEDTLS_SSL_TRUNCATED_HMAC) - ssl->session_negotiate->trunc_hmac, -#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */ -#endif /* MBEDTLS_SSL_SOME_MODES_USE_MAC */ -#if defined(MBEDTLS_ZLIB_SUPPORT) - ssl->session_negotiate->compression, -#endif - ssl->handshake->tls_prf, - ssl->handshake->randbytes, - ssl->minor_ver, - ssl->conf->endpoint, - ssl ); - if( ret != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "ssl_populate_transform", ret ); - return( ret ); - } - - /* We no longer need Server/ClientHello.random values */ - mbedtls_platform_zeroize( ssl->handshake->randbytes, - sizeof( ssl->handshake->randbytes ) ); - - /* Allocate compression buffer */ -#if defined(MBEDTLS_ZLIB_SUPPORT) - if( ssl->session_negotiate->compression == MBEDTLS_SSL_COMPRESS_DEFLATE && - ssl->compress_buf == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "Allocating compression buffer" ) ); - ssl->compress_buf = mbedtls_calloc( 1, MBEDTLS_SSL_COMPRESS_BUFFER_LEN ); - if( ssl->compress_buf == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc(%d bytes) failed", - MBEDTLS_SSL_COMPRESS_BUFFER_LEN ) ); - return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); - } - } -#endif - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= derive keys" ) ); - - return( 0 ); -} - -#if defined(MBEDTLS_SSL_PROTO_SSL3) -void ssl_calc_verify_ssl( const mbedtls_ssl_context *ssl, - unsigned char hash[36], - size_t *hlen ) -{ - mbedtls_md5_context md5; - mbedtls_sha1_context sha1; - unsigned char pad_1[48]; - unsigned char pad_2[48]; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc verify ssl" ) ); - - mbedtls_md5_init( &md5 ); - mbedtls_sha1_init( &sha1 ); - - mbedtls_md5_clone( &md5, &ssl->handshake->fin_md5 ); - mbedtls_sha1_clone( &sha1, &ssl->handshake->fin_sha1 ); - - memset( pad_1, 0x36, 48 ); - memset( pad_2, 0x5C, 48 ); - - mbedtls_md5_update_ret( &md5, ssl->session_negotiate->master, 48 ); - mbedtls_md5_update_ret( &md5, pad_1, 48 ); - mbedtls_md5_finish_ret( &md5, hash ); - - mbedtls_md5_starts_ret( &md5 ); - mbedtls_md5_update_ret( &md5, ssl->session_negotiate->master, 48 ); - mbedtls_md5_update_ret( &md5, pad_2, 48 ); - mbedtls_md5_update_ret( &md5, hash, 16 ); - mbedtls_md5_finish_ret( &md5, hash ); - - mbedtls_sha1_update_ret( &sha1, ssl->session_negotiate->master, 48 ); - mbedtls_sha1_update_ret( &sha1, pad_1, 40 ); - mbedtls_sha1_finish_ret( &sha1, hash + 16 ); - - mbedtls_sha1_starts_ret( &sha1 ); - mbedtls_sha1_update_ret( &sha1, ssl->session_negotiate->master, 48 ); - mbedtls_sha1_update_ret( &sha1, pad_2, 40 ); - mbedtls_sha1_update_ret( &sha1, hash + 16, 20 ); - mbedtls_sha1_finish_ret( &sha1, hash + 16 ); - - *hlen = 36; - - MBEDTLS_SSL_DEBUG_BUF( 3, "calculated verify result", hash, *hlen ); - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc verify" ) ); - - mbedtls_md5_free( &md5 ); - mbedtls_sha1_free( &sha1 ); - - return; -} -#endif /* MBEDTLS_SSL_PROTO_SSL3 */ - -#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) -void ssl_calc_verify_tls( const mbedtls_ssl_context *ssl, - unsigned char hash[36], - size_t *hlen ) -{ - mbedtls_md5_context md5; - mbedtls_sha1_context sha1; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc verify tls" ) ); - - mbedtls_md5_init( &md5 ); - mbedtls_sha1_init( &sha1 ); - - mbedtls_md5_clone( &md5, &ssl->handshake->fin_md5 ); - mbedtls_sha1_clone( &sha1, &ssl->handshake->fin_sha1 ); - - mbedtls_md5_finish_ret( &md5, hash ); - mbedtls_sha1_finish_ret( &sha1, hash + 16 ); - - *hlen = 36; - - MBEDTLS_SSL_DEBUG_BUF( 3, "calculated verify result", hash, *hlen ); - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc verify" ) ); - - mbedtls_md5_free( &md5 ); - mbedtls_sha1_free( &sha1 ); - - return; -} -#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 */ - -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) -#if defined(MBEDTLS_SHA256_C) -void ssl_calc_verify_tls_sha256( const mbedtls_ssl_context *ssl, - unsigned char hash[32], - size_t *hlen ) -{ -#if defined(MBEDTLS_USE_PSA_CRYPTO) - size_t hash_size; - psa_status_t status; - psa_hash_operation_t sha256_psa = psa_hash_operation_init(); - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> PSA calc verify sha256" ) ); - status = psa_hash_clone( &ssl->handshake->fin_sha256_psa, &sha256_psa ); - if( status != PSA_SUCCESS ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "PSA hash clone failed" ) ); - return; - } - - status = psa_hash_finish( &sha256_psa, hash, 32, &hash_size ); - if( status != PSA_SUCCESS ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "PSA hash finish failed" ) ); - return; - } - - *hlen = 32; - MBEDTLS_SSL_DEBUG_BUF( 3, "PSA calculated verify result", hash, *hlen ); - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= PSA calc verify" ) ); -#else - mbedtls_sha256_context sha256; - - mbedtls_sha256_init( &sha256 ); - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc verify sha256" ) ); - - mbedtls_sha256_clone( &sha256, &ssl->handshake->fin_sha256 ); - mbedtls_sha256_finish_ret( &sha256, hash ); - - *hlen = 32; - - MBEDTLS_SSL_DEBUG_BUF( 3, "calculated verify result", hash, *hlen ); - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc verify" ) ); - - mbedtls_sha256_free( &sha256 ); -#endif /* MBEDTLS_USE_PSA_CRYPTO */ - return; -} -#endif /* MBEDTLS_SHA256_C */ - -#if defined(MBEDTLS_SHA512_C) -void ssl_calc_verify_tls_sha384( const mbedtls_ssl_context *ssl, - unsigned char hash[48], - size_t *hlen ) -{ -#if defined(MBEDTLS_USE_PSA_CRYPTO) - size_t hash_size; - psa_status_t status; - psa_hash_operation_t sha384_psa = psa_hash_operation_init(); - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> PSA calc verify sha384" ) ); - status = psa_hash_clone( &ssl->handshake->fin_sha384_psa, &sha384_psa ); - if( status != PSA_SUCCESS ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "PSA hash clone failed" ) ); - return; - } - - status = psa_hash_finish( &sha384_psa, hash, 48, &hash_size ); - if( status != PSA_SUCCESS ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "PSA hash finish failed" ) ); - return; - } - - *hlen = 48; - MBEDTLS_SSL_DEBUG_BUF( 3, "PSA calculated verify result", hash, *hlen ); - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= PSA calc verify" ) ); -#else - mbedtls_sha512_context sha512; - - mbedtls_sha512_init( &sha512 ); - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc verify sha384" ) ); - - mbedtls_sha512_clone( &sha512, &ssl->handshake->fin_sha512 ); - mbedtls_sha512_finish_ret( &sha512, hash ); - - *hlen = 48; - - MBEDTLS_SSL_DEBUG_BUF( 3, "calculated verify result", hash, *hlen ); - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc verify" ) ); - - mbedtls_sha512_free( &sha512 ); -#endif /* MBEDTLS_USE_PSA_CRYPTO */ - return; -} -#endif /* MBEDTLS_SHA512_C */ -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ - -#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED) -int mbedtls_ssl_psk_derive_premaster( mbedtls_ssl_context *ssl, mbedtls_key_exchange_type_t key_ex ) -{ - unsigned char *p = ssl->handshake->premaster; - unsigned char *end = p + sizeof( ssl->handshake->premaster ); - const unsigned char *psk = ssl->conf->psk; - size_t psk_len = ssl->conf->psk_len; - - /* If the psk callback was called, use its result */ - if( ssl->handshake->psk != NULL ) - { - psk = ssl->handshake->psk; - psk_len = ssl->handshake->psk_len; - } - - /* - * PMS = struct { - * opaque other_secret<0..2^16-1>; - * opaque psk<0..2^16-1>; - * }; - * with "other_secret" depending on the particular key exchange - */ -#if defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED) - if( key_ex == MBEDTLS_KEY_EXCHANGE_PSK ) - { - if( end - p < 2 ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - *(p++) = (unsigned char)( psk_len >> 8 ); - *(p++) = (unsigned char)( psk_len ); - - if( end < p || (size_t)( end - p ) < psk_len ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - memset( p, 0, psk_len ); - p += psk_len; - } - else -#endif /* MBEDTLS_KEY_EXCHANGE_PSK_ENABLED */ -#if defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED) - if( key_ex == MBEDTLS_KEY_EXCHANGE_RSA_PSK ) - { - /* - * other_secret already set by the ClientKeyExchange message, - * and is 48 bytes long - */ - if( end - p < 2 ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - *p++ = 0; - *p++ = 48; - p += 48; - } - else -#endif /* MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED */ -#if defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED) - if( key_ex == MBEDTLS_KEY_EXCHANGE_DHE_PSK ) - { - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - size_t len; - - /* Write length only when we know the actual value */ - if( ( ret = mbedtls_dhm_calc_secret( &ssl->handshake->dhm_ctx, - p + 2, end - ( p + 2 ), &len, - ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_calc_secret", ret ); - return( ret ); - } - *(p++) = (unsigned char)( len >> 8 ); - *(p++) = (unsigned char)( len ); - p += len; - - MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: K ", &ssl->handshake->dhm_ctx.K ); - } - else -#endif /* MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED */ -#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED) - if( key_ex == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK ) - { - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - size_t zlen; - - if( ( ret = mbedtls_ecdh_calc_secret( &ssl->handshake->ecdh_ctx, &zlen, - p + 2, end - ( p + 2 ), - ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_calc_secret", ret ); - return( ret ); - } - - *(p++) = (unsigned char)( zlen >> 8 ); - *(p++) = (unsigned char)( zlen ); - p += zlen; - - MBEDTLS_SSL_DEBUG_ECDH( 3, &ssl->handshake->ecdh_ctx, - MBEDTLS_DEBUG_ECDH_Z ); - } - else -#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED */ - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - - /* opaque psk<0..2^16-1>; */ - if( end - p < 2 ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - *(p++) = (unsigned char)( psk_len >> 8 ); - *(p++) = (unsigned char)( psk_len ); - - if( end < p || (size_t)( end - p ) < psk_len ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - memcpy( p, psk, psk_len ); - p += psk_len; - - ssl->handshake->pmslen = p - ssl->handshake->premaster; - - return( 0 ); -} -#endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */ - -#if defined(MBEDTLS_SSL_PROTO_SSL3) -/* - * SSLv3.0 MAC functions - */ -#define SSL_MAC_MAX_BYTES 20 /* MD-5 or SHA-1 */ -static void ssl_mac( mbedtls_md_context_t *md_ctx, - const unsigned char *secret, - const unsigned char *buf, size_t len, - const unsigned char *ctr, int type, - unsigned char out[SSL_MAC_MAX_BYTES] ) -{ - unsigned char header[11]; - unsigned char padding[48]; - int padlen; - int md_size = mbedtls_md_get_size( md_ctx->md_info ); - int md_type = mbedtls_md_get_type( md_ctx->md_info ); - - /* Only MD5 and SHA-1 supported */ - if( md_type == MBEDTLS_MD_MD5 ) - padlen = 48; - else - padlen = 40; - - memcpy( header, ctr, 8 ); - header[ 8] = (unsigned char) type; - header[ 9] = (unsigned char)( len >> 8 ); - header[10] = (unsigned char)( len ); - - memset( padding, 0x36, padlen ); - mbedtls_md_starts( md_ctx ); - mbedtls_md_update( md_ctx, secret, md_size ); - mbedtls_md_update( md_ctx, padding, padlen ); - mbedtls_md_update( md_ctx, header, 11 ); - mbedtls_md_update( md_ctx, buf, len ); - mbedtls_md_finish( md_ctx, out ); - - memset( padding, 0x5C, padlen ); - mbedtls_md_starts( md_ctx ); - mbedtls_md_update( md_ctx, secret, md_size ); - mbedtls_md_update( md_ctx, padding, padlen ); - mbedtls_md_update( md_ctx, out, md_size ); - mbedtls_md_finish( md_ctx, out ); -} -#endif /* MBEDTLS_SSL_PROTO_SSL3 */ - /* The function below is only used in the Lucky 13 counter-measure in * mbedtls_ssl_decrypt_buf(). These are the defines that guard the call site. */ #if defined(MBEDTLS_SSL_SOME_MODES_USE_MAC) && \ @@ -3540,37 +1615,6 @@ static int ssl_decompress_buf( mbedtls_ssl_context *ssl ) } #endif /* MBEDTLS_ZLIB_SUPPORT */ -#if defined(MBEDTLS_SSL_SRV_C) && defined(MBEDTLS_SSL_RENEGOTIATION) -static int ssl_write_hello_request( mbedtls_ssl_context *ssl ); - -#if defined(MBEDTLS_SSL_PROTO_DTLS) -int mbedtls_ssl_resend_hello_request( mbedtls_ssl_context *ssl ) -{ - /* If renegotiation is not enforced, retransmit until we would reach max - * timeout if we were using the usual handshake doubling scheme */ - if( ssl->conf->renego_max_records < 0 ) - { - uint32_t ratio = ssl->conf->hs_timeout_max / ssl->conf->hs_timeout_min + 1; - unsigned char doublings = 1; - - while( ratio != 0 ) - { - ++doublings; - ratio >>= 1; - } - - if( ++ssl->renego_records_seen > doublings ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "no longer retransmitting hello request" ) ); - return( 0 ); - } - } - - return( ssl_write_hello_request( ssl ) ); -} -#endif -#endif /* MBEDTLS_SSL_SRV_C && MBEDTLS_SSL_RENEGOTIATION */ - /* * Fill the input message buffer by appending data to it. * The amount of data already fetched is in ssl->in_left. @@ -6623,857 +4667,6 @@ int mbedtls_ssl_send_alert_message( mbedtls_ssl_context *ssl, return( 0 ); } -#if defined(MBEDTLS_X509_CRT_PARSE_C) -static void ssl_clear_peer_cert( mbedtls_ssl_session *session ) -{ -#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) - if( session->peer_cert != NULL ) - { - mbedtls_x509_crt_free( session->peer_cert ); - mbedtls_free( session->peer_cert ); - session->peer_cert = NULL; - } -#else /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ - if( session->peer_cert_digest != NULL ) - { - /* Zeroization is not necessary. */ - mbedtls_free( session->peer_cert_digest ); - session->peer_cert_digest = NULL; - session->peer_cert_digest_type = MBEDTLS_MD_NONE; - session->peer_cert_digest_len = 0; - } -#endif /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ -} -#endif /* MBEDTLS_X509_CRT_PARSE_C */ - -/* - * Handshake functions - */ -#if !defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) -/* No certificate support -> dummy functions */ -int mbedtls_ssl_write_certificate( mbedtls_ssl_context *ssl ) -{ - const mbedtls_ssl_ciphersuite_t *ciphersuite_info = - ssl->handshake->ciphersuite_info; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate" ) ); - - if( !mbedtls_ssl_ciphersuite_uses_srv_cert( ciphersuite_info ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate" ) ); - ssl->state++; - return( 0 ); - } - - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); -} - -int mbedtls_ssl_parse_certificate( mbedtls_ssl_context *ssl ) -{ - const mbedtls_ssl_ciphersuite_t *ciphersuite_info = - ssl->handshake->ciphersuite_info; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse certificate" ) ); - - if( !mbedtls_ssl_ciphersuite_uses_srv_cert( ciphersuite_info ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate" ) ); - ssl->state++; - return( 0 ); - } - - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); -} - -#else /* MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */ -/* Some certificate support -> implement write and parse */ - -int mbedtls_ssl_write_certificate( mbedtls_ssl_context *ssl ) -{ - int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; - size_t i, n; - const mbedtls_x509_crt *crt; - const mbedtls_ssl_ciphersuite_t *ciphersuite_info = - ssl->handshake->ciphersuite_info; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate" ) ); - - if( !mbedtls_ssl_ciphersuite_uses_srv_cert( ciphersuite_info ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate" ) ); - ssl->state++; - return( 0 ); - } - -#if defined(MBEDTLS_SSL_CLI_C) - if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT ) - { - if( ssl->client_auth == 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate" ) ); - ssl->state++; - return( 0 ); - } - -#if defined(MBEDTLS_SSL_PROTO_SSL3) - /* - * If using SSLv3 and got no cert, send an Alert message - * (otherwise an empty Certificate message will be sent). - */ - if( mbedtls_ssl_own_cert( ssl ) == NULL && - ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) - { - ssl->out_msglen = 2; - ssl->out_msgtype = MBEDTLS_SSL_MSG_ALERT; - ssl->out_msg[0] = MBEDTLS_SSL_ALERT_LEVEL_WARNING; - ssl->out_msg[1] = MBEDTLS_SSL_ALERT_MSG_NO_CERT; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "got no certificate to send" ) ); - goto write_msg; - } -#endif /* MBEDTLS_SSL_PROTO_SSL3 */ - } -#endif /* MBEDTLS_SSL_CLI_C */ -#if defined(MBEDTLS_SSL_SRV_C) - if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER ) - { - if( mbedtls_ssl_own_cert( ssl ) == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no certificate to send" ) ); - return( MBEDTLS_ERR_SSL_CERTIFICATE_REQUIRED ); - } - } -#endif - - MBEDTLS_SSL_DEBUG_CRT( 3, "own certificate", mbedtls_ssl_own_cert( ssl ) ); - - /* - * 0 . 0 handshake type - * 1 . 3 handshake length - * 4 . 6 length of all certs - * 7 . 9 length of cert. 1 - * 10 . n-1 peer certificate - * n . n+2 length of cert. 2 - * n+3 . ... upper level cert, etc. - */ - i = 7; - crt = mbedtls_ssl_own_cert( ssl ); - - while( crt != NULL ) - { - n = crt->raw.len; - if( n > MBEDTLS_SSL_OUT_CONTENT_LEN - 3 - i ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "certificate too large, %d > %d", - i + 3 + n, MBEDTLS_SSL_OUT_CONTENT_LEN ) ); - return( MBEDTLS_ERR_SSL_CERTIFICATE_TOO_LARGE ); - } - - ssl->out_msg[i ] = (unsigned char)( n >> 16 ); - ssl->out_msg[i + 1] = (unsigned char)( n >> 8 ); - ssl->out_msg[i + 2] = (unsigned char)( n ); - - i += 3; memcpy( ssl->out_msg + i, crt->raw.p, n ); - i += n; crt = crt->next; - } - - ssl->out_msg[4] = (unsigned char)( ( i - 7 ) >> 16 ); - ssl->out_msg[5] = (unsigned char)( ( i - 7 ) >> 8 ); - ssl->out_msg[6] = (unsigned char)( ( i - 7 ) ); - - ssl->out_msglen = i; - ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE; - ssl->out_msg[0] = MBEDTLS_SSL_HS_CERTIFICATE; - -#if defined(MBEDTLS_SSL_PROTO_SSL3) && defined(MBEDTLS_SSL_CLI_C) -write_msg: -#endif - - ssl->state++; - - if( ( ret = mbedtls_ssl_write_handshake_msg( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_handshake_msg", ret ); - return( ret ); - } - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write certificate" ) ); - - return( ret ); -} - -#if defined(MBEDTLS_SSL_RENEGOTIATION) && defined(MBEDTLS_SSL_CLI_C) - -#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) -static int ssl_check_peer_crt_unchanged( mbedtls_ssl_context *ssl, - unsigned char *crt_buf, - size_t crt_buf_len ) -{ - mbedtls_x509_crt const * const peer_crt = ssl->session->peer_cert; - - if( peer_crt == NULL ) - return( -1 ); - - if( peer_crt->raw.len != crt_buf_len ) - return( -1 ); - - return( memcmp( peer_crt->raw.p, crt_buf, peer_crt->raw.len ) ); -} -#else /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ -static int ssl_check_peer_crt_unchanged( mbedtls_ssl_context *ssl, - unsigned char *crt_buf, - size_t crt_buf_len ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - unsigned char const * const peer_cert_digest = - ssl->session->peer_cert_digest; - mbedtls_md_type_t const peer_cert_digest_type = - ssl->session->peer_cert_digest_type; - mbedtls_md_info_t const * const digest_info = - mbedtls_md_info_from_type( peer_cert_digest_type ); - unsigned char tmp_digest[MBEDTLS_SSL_PEER_CERT_DIGEST_MAX_LEN]; - size_t digest_len; - - if( peer_cert_digest == NULL || digest_info == NULL ) - return( -1 ); - - digest_len = mbedtls_md_get_size( digest_info ); - if( digest_len > MBEDTLS_SSL_PEER_CERT_DIGEST_MAX_LEN ) - return( -1 ); - - ret = mbedtls_md( digest_info, crt_buf, crt_buf_len, tmp_digest ); - if( ret != 0 ) - return( -1 ); - - return( memcmp( tmp_digest, peer_cert_digest, digest_len ) ); -} -#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ -#endif /* MBEDTLS_SSL_RENEGOTIATION && MBEDTLS_SSL_CLI_C */ - -/* - * Once the certificate message is read, parse it into a cert chain and - * perform basic checks, but leave actual verification to the caller - */ -static int ssl_parse_certificate_chain( mbedtls_ssl_context *ssl, - mbedtls_x509_crt *chain ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; -#if defined(MBEDTLS_SSL_RENEGOTIATION) && defined(MBEDTLS_SSL_CLI_C) - int crt_cnt=0; -#endif - size_t i, n; - uint8_t alert; - - if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE ); - return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE ); - } - - if( ssl->in_msg[0] != MBEDTLS_SSL_HS_CERTIFICATE || - ssl->in_hslen < mbedtls_ssl_hs_hdr_len( ssl ) + 3 + 3 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE ); - } - - i = mbedtls_ssl_hs_hdr_len( ssl ); - - /* - * Same message structure as in mbedtls_ssl_write_certificate() - */ - n = ( ssl->in_msg[i+1] << 8 ) | ssl->in_msg[i+2]; - - if( ssl->in_msg[i] != 0 || - ssl->in_hslen != n + 3 + mbedtls_ssl_hs_hdr_len( ssl ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE ); - } - - /* Make &ssl->in_msg[i] point to the beginning of the CRT chain. */ - i += 3; - - /* Iterate through and parse the CRTs in the provided chain. */ - while( i < ssl->in_hslen ) - { - /* Check that there's room for the next CRT's length fields. */ - if ( i + 3 > ssl->in_hslen ) { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) ); - mbedtls_ssl_send_alert_message( ssl, - MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE ); - } - /* In theory, the CRT can be up to 2**24 Bytes, but we don't support - * anything beyond 2**16 ~ 64K. */ - if( ssl->in_msg[i] != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) ); - mbedtls_ssl_send_alert_message( ssl, - MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE ); - } - - /* Read length of the next CRT in the chain. */ - n = ( (unsigned int) ssl->in_msg[i + 1] << 8 ) - | (unsigned int) ssl->in_msg[i + 2]; - i += 3; - - if( n < 128 || i + n > ssl->in_hslen ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) ); - mbedtls_ssl_send_alert_message( ssl, - MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE ); - } - - /* Check if we're handling the first CRT in the chain. */ -#if defined(MBEDTLS_SSL_RENEGOTIATION) && defined(MBEDTLS_SSL_CLI_C) - if( crt_cnt++ == 0 && - ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT && - ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS ) - { - /* During client-side renegotiation, check that the server's - * end-CRTs hasn't changed compared to the initial handshake, - * mitigating the triple handshake attack. On success, reuse - * the original end-CRT instead of parsing it again. */ - MBEDTLS_SSL_DEBUG_MSG( 3, ( "Check that peer CRT hasn't changed during renegotiation" ) ); - if( ssl_check_peer_crt_unchanged( ssl, - &ssl->in_msg[i], - n ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "new server cert during renegotiation" ) ); - mbedtls_ssl_send_alert_message( ssl, - MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_ACCESS_DENIED ); - return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE ); - } - - /* Now we can safely free the original chain. */ - ssl_clear_peer_cert( ssl->session ); - } -#endif /* MBEDTLS_SSL_RENEGOTIATION && MBEDTLS_SSL_CLI_C */ - - /* Parse the next certificate in the chain. */ -#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) - ret = mbedtls_x509_crt_parse_der( chain, ssl->in_msg + i, n ); -#else - /* If we don't need to store the CRT chain permanently, parse - * it in-place from the input buffer instead of making a copy. */ - ret = mbedtls_x509_crt_parse_der_nocopy( chain, ssl->in_msg + i, n ); -#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ - switch( ret ) - { - case 0: /*ok*/ - case MBEDTLS_ERR_X509_UNKNOWN_SIG_ALG + MBEDTLS_ERR_OID_NOT_FOUND: - /* Ignore certificate with an unknown algorithm: maybe a - prior certificate was already trusted. */ - break; - - case MBEDTLS_ERR_X509_ALLOC_FAILED: - alert = MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR; - goto crt_parse_der_failed; - - case MBEDTLS_ERR_X509_UNKNOWN_VERSION: - alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT; - goto crt_parse_der_failed; - - default: - alert = MBEDTLS_SSL_ALERT_MSG_BAD_CERT; - crt_parse_der_failed: - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, alert ); - MBEDTLS_SSL_DEBUG_RET( 1, " mbedtls_x509_crt_parse_der", ret ); - return( ret ); - } - - i += n; - } - - MBEDTLS_SSL_DEBUG_CRT( 3, "peer certificate", chain ); - return( 0 ); -} - -#if defined(MBEDTLS_SSL_SRV_C) -static int ssl_srv_check_client_no_crt_notification( mbedtls_ssl_context *ssl ) -{ - if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT ) - return( -1 ); - -#if defined(MBEDTLS_SSL_PROTO_SSL3) - /* - * Check if the client sent an empty certificate - */ - if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) - { - if( ssl->in_msglen == 2 && - ssl->in_msgtype == MBEDTLS_SSL_MSG_ALERT && - ssl->in_msg[0] == MBEDTLS_SSL_ALERT_LEVEL_WARNING && - ssl->in_msg[1] == MBEDTLS_SSL_ALERT_MSG_NO_CERT ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "SSLv3 client has no certificate" ) ); - return( 0 ); - } - - return( -1 ); - } -#endif /* MBEDTLS_SSL_PROTO_SSL3 */ - -#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \ - defined(MBEDTLS_SSL_PROTO_TLS1_2) - if( ssl->in_hslen == 3 + mbedtls_ssl_hs_hdr_len( ssl ) && - ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE && - ssl->in_msg[0] == MBEDTLS_SSL_HS_CERTIFICATE && - memcmp( ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl ), "\0\0\0", 3 ) == 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "TLSv1 client has no certificate" ) ); - return( 0 ); - } - - return( -1 ); -#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 || \ - MBEDTLS_SSL_PROTO_TLS1_2 */ -} -#endif /* MBEDTLS_SSL_SRV_C */ - -/* Check if a certificate message is expected. - * Return either - * - SSL_CERTIFICATE_EXPECTED, or - * - SSL_CERTIFICATE_SKIP - * indicating whether a Certificate message is expected or not. - */ -#define SSL_CERTIFICATE_EXPECTED 0 -#define SSL_CERTIFICATE_SKIP 1 -static int ssl_parse_certificate_coordinate( mbedtls_ssl_context *ssl, - int authmode ) -{ - const mbedtls_ssl_ciphersuite_t *ciphersuite_info = - ssl->handshake->ciphersuite_info; - - if( !mbedtls_ssl_ciphersuite_uses_srv_cert( ciphersuite_info ) ) - return( SSL_CERTIFICATE_SKIP ); - -#if defined(MBEDTLS_SSL_SRV_C) - if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER ) - { - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK ) - return( SSL_CERTIFICATE_SKIP ); - - if( authmode == MBEDTLS_SSL_VERIFY_NONE ) - { - ssl->session_negotiate->verify_result = - MBEDTLS_X509_BADCERT_SKIP_VERIFY; - return( SSL_CERTIFICATE_SKIP ); - } - } -#else - ((void) authmode); -#endif /* MBEDTLS_SSL_SRV_C */ - - return( SSL_CERTIFICATE_EXPECTED ); -} - -static int ssl_parse_certificate_verify( mbedtls_ssl_context *ssl, - int authmode, - mbedtls_x509_crt *chain, - void *rs_ctx ) -{ - int ret = 0; - const mbedtls_ssl_ciphersuite_t *ciphersuite_info = - ssl->handshake->ciphersuite_info; - int have_ca_chain = 0; - - int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *); - void *p_vrfy; - - if( authmode == MBEDTLS_SSL_VERIFY_NONE ) - return( 0 ); - - if( ssl->f_vrfy != NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "Use context-specific verification callback" ) ); - f_vrfy = ssl->f_vrfy; - p_vrfy = ssl->p_vrfy; - } - else - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "Use configuration-specific verification callback" ) ); - f_vrfy = ssl->conf->f_vrfy; - p_vrfy = ssl->conf->p_vrfy; - } - - /* - * Main check: verify certificate - */ -#if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK) - if( ssl->conf->f_ca_cb != NULL ) - { - ((void) rs_ctx); - have_ca_chain = 1; - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "use CA callback for X.509 CRT verification" ) ); - ret = mbedtls_x509_crt_verify_with_ca_cb( - chain, - ssl->conf->f_ca_cb, - ssl->conf->p_ca_cb, - ssl->conf->cert_profile, - ssl->hostname, - &ssl->session_negotiate->verify_result, - f_vrfy, p_vrfy ); - } - else -#endif /* MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK */ - { - mbedtls_x509_crt *ca_chain; - mbedtls_x509_crl *ca_crl; - -#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) - if( ssl->handshake->sni_ca_chain != NULL ) - { - ca_chain = ssl->handshake->sni_ca_chain; - ca_crl = ssl->handshake->sni_ca_crl; - } - else -#endif - { - ca_chain = ssl->conf->ca_chain; - ca_crl = ssl->conf->ca_crl; - } - - if( ca_chain != NULL ) - have_ca_chain = 1; - - ret = mbedtls_x509_crt_verify_restartable( - chain, - ca_chain, ca_crl, - ssl->conf->cert_profile, - ssl->hostname, - &ssl->session_negotiate->verify_result, - f_vrfy, p_vrfy, rs_ctx ); - } - - if( ret != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "x509_verify_cert", ret ); - } - -#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) - if( ret == MBEDTLS_ERR_ECP_IN_PROGRESS ) - return( MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS ); -#endif - - /* - * Secondary checks: always done, but change 'ret' only if it was 0 - */ - -#if defined(MBEDTLS_ECP_C) - { - const mbedtls_pk_context *pk = &chain->pk; - - /* If certificate uses an EC key, make sure the curve is OK */ - if( mbedtls_pk_can_do( pk, MBEDTLS_PK_ECKEY ) && - mbedtls_ssl_check_curve( ssl, mbedtls_pk_ec( *pk )->grp.id ) != 0 ) - { - ssl->session_negotiate->verify_result |= MBEDTLS_X509_BADCERT_BAD_KEY; - - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate (EC key curve)" ) ); - if( ret == 0 ) - ret = MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE; - } - } -#endif /* MBEDTLS_ECP_C */ - - if( mbedtls_ssl_check_cert_usage( chain, - ciphersuite_info, - ! ssl->conf->endpoint, - &ssl->session_negotiate->verify_result ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate (usage extensions)" ) ); - if( ret == 0 ) - ret = MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE; - } - - /* mbedtls_x509_crt_verify_with_profile is supposed to report a - * verification failure through MBEDTLS_ERR_X509_CERT_VERIFY_FAILED, - * with details encoded in the verification flags. All other kinds - * of error codes, including those from the user provided f_vrfy - * functions, are treated as fatal and lead to a failure of - * ssl_parse_certificate even if verification was optional. */ - if( authmode == MBEDTLS_SSL_VERIFY_OPTIONAL && - ( ret == MBEDTLS_ERR_X509_CERT_VERIFY_FAILED || - ret == MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE ) ) - { - ret = 0; - } - - if( have_ca_chain == 0 && authmode == MBEDTLS_SSL_VERIFY_REQUIRED ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no CA chain" ) ); - ret = MBEDTLS_ERR_SSL_CA_CHAIN_REQUIRED; - } - - if( ret != 0 ) - { - uint8_t alert; - - /* The certificate may have been rejected for several reasons. - Pick one and send the corresponding alert. Which alert to send - may be a subject of debate in some cases. */ - if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_OTHER ) - alert = MBEDTLS_SSL_ALERT_MSG_ACCESS_DENIED; - else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_CN_MISMATCH ) - alert = MBEDTLS_SSL_ALERT_MSG_BAD_CERT; - else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_KEY_USAGE ) - alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT; - else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_EXT_KEY_USAGE ) - alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT; - else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_NS_CERT_TYPE ) - alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT; - else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_BAD_PK ) - alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT; - else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_BAD_KEY ) - alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT; - else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_EXPIRED ) - alert = MBEDTLS_SSL_ALERT_MSG_CERT_EXPIRED; - else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_REVOKED ) - alert = MBEDTLS_SSL_ALERT_MSG_CERT_REVOKED; - else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_NOT_TRUSTED ) - alert = MBEDTLS_SSL_ALERT_MSG_UNKNOWN_CA; - else - alert = MBEDTLS_SSL_ALERT_MSG_CERT_UNKNOWN; - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - alert ); - } - -#if defined(MBEDTLS_DEBUG_C) - if( ssl->session_negotiate->verify_result != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "! Certificate verification flags %x", - ssl->session_negotiate->verify_result ) ); - } - else - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "Certificate verification flags clear" ) ); - } -#endif /* MBEDTLS_DEBUG_C */ - - return( ret ); -} - -#if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) -static int ssl_remember_peer_crt_digest( mbedtls_ssl_context *ssl, - unsigned char *start, size_t len ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - /* Remember digest of the peer's end-CRT. */ - ssl->session_negotiate->peer_cert_digest = - mbedtls_calloc( 1, MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_LEN ); - if( ssl->session_negotiate->peer_cert_digest == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc(%d bytes) failed", - MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_LEN ) ); - mbedtls_ssl_send_alert_message( ssl, - MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR ); - - return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); - } - - ret = mbedtls_md( mbedtls_md_info_from_type( - MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_TYPE ), - start, len, - ssl->session_negotiate->peer_cert_digest ); - - ssl->session_negotiate->peer_cert_digest_type = - MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_TYPE; - ssl->session_negotiate->peer_cert_digest_len = - MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_LEN; - - return( ret ); -} - -static int ssl_remember_peer_pubkey( mbedtls_ssl_context *ssl, - unsigned char *start, size_t len ) -{ - unsigned char *end = start + len; - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - - /* Make a copy of the peer's raw public key. */ - mbedtls_pk_init( &ssl->handshake->peer_pubkey ); - ret = mbedtls_pk_parse_subpubkey( &start, end, - &ssl->handshake->peer_pubkey ); - if( ret != 0 ) - { - /* We should have parsed the public key before. */ - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - - return( 0 ); -} -#endif /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ - -int mbedtls_ssl_parse_certificate( mbedtls_ssl_context *ssl ) -{ - int ret = 0; - int crt_expected; -#if defined(MBEDTLS_SSL_SRV_C) && defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) - const int authmode = ssl->handshake->sni_authmode != MBEDTLS_SSL_VERIFY_UNSET - ? ssl->handshake->sni_authmode - : ssl->conf->authmode; -#else - const int authmode = ssl->conf->authmode; -#endif - void *rs_ctx = NULL; - mbedtls_x509_crt *chain = NULL; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse certificate" ) ); - - crt_expected = ssl_parse_certificate_coordinate( ssl, authmode ); - if( crt_expected == SSL_CERTIFICATE_SKIP ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate" ) ); - goto exit; - } - -#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) - if( ssl->handshake->ecrs_enabled && - ssl->handshake->ecrs_state == ssl_ecrs_crt_verify ) - { - chain = ssl->handshake->ecrs_peer_cert; - ssl->handshake->ecrs_peer_cert = NULL; - goto crt_verify; - } -#endif - - if( ( ret = mbedtls_ssl_read_record( ssl, 1 ) ) != 0 ) - { - /* mbedtls_ssl_read_record may have sent an alert already. We - let it decide whether to alert. */ - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret ); - goto exit; - } - -#if defined(MBEDTLS_SSL_SRV_C) - if( ssl_srv_check_client_no_crt_notification( ssl ) == 0 ) - { - ssl->session_negotiate->verify_result = MBEDTLS_X509_BADCERT_MISSING; - - if( authmode == MBEDTLS_SSL_VERIFY_OPTIONAL ) - ret = 0; - else - ret = MBEDTLS_ERR_SSL_NO_CLIENT_CERTIFICATE; - - goto exit; - } -#endif /* MBEDTLS_SSL_SRV_C */ - - /* Clear existing peer CRT structure in case we tried to - * reuse a session but it failed, and allocate a new one. */ - ssl_clear_peer_cert( ssl->session_negotiate ); - - chain = mbedtls_calloc( 1, sizeof( mbedtls_x509_crt ) ); - if( chain == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc(%d bytes) failed", - sizeof( mbedtls_x509_crt ) ) ); - mbedtls_ssl_send_alert_message( ssl, - MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR ); - - ret = MBEDTLS_ERR_SSL_ALLOC_FAILED; - goto exit; - } - mbedtls_x509_crt_init( chain ); - - ret = ssl_parse_certificate_chain( ssl, chain ); - if( ret != 0 ) - goto exit; - -#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) - if( ssl->handshake->ecrs_enabled) - ssl->handshake->ecrs_state = ssl_ecrs_crt_verify; - -crt_verify: - if( ssl->handshake->ecrs_enabled) - rs_ctx = &ssl->handshake->ecrs_ctx; -#endif - - ret = ssl_parse_certificate_verify( ssl, authmode, - chain, rs_ctx ); - if( ret != 0 ) - goto exit; - -#if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) - { - unsigned char *crt_start, *pk_start; - size_t crt_len, pk_len; - - /* We parse the CRT chain without copying, so - * these pointers point into the input buffer, - * and are hence still valid after freeing the - * CRT chain. */ - - crt_start = chain->raw.p; - crt_len = chain->raw.len; - - pk_start = chain->pk_raw.p; - pk_len = chain->pk_raw.len; - - /* Free the CRT structures before computing - * digest and copying the peer's public key. */ - mbedtls_x509_crt_free( chain ); - mbedtls_free( chain ); - chain = NULL; - - ret = ssl_remember_peer_crt_digest( ssl, crt_start, crt_len ); - if( ret != 0 ) - goto exit; - - ret = ssl_remember_peer_pubkey( ssl, pk_start, pk_len ); - if( ret != 0 ) - goto exit; - } -#else /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ - /* Pass ownership to session structure. */ - ssl->session_negotiate->peer_cert = chain; - chain = NULL; -#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse certificate" ) ); - -exit: - - if( ret == 0 ) - ssl->state++; - -#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) - if( ret == MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS ) - { - ssl->handshake->ecrs_peer_cert = chain; - chain = NULL; - } -#endif - - if( chain != NULL ) - { - mbedtls_x509_crt_free( chain ); - mbedtls_free( chain ); - } - - return( ret ); -} -#endif /* MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */ - int mbedtls_ssl_write_change_cipher_spec( mbedtls_ssl_context *ssl ) { int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; @@ -7570,894 +4763,6 @@ int mbedtls_ssl_parse_change_cipher_spec( mbedtls_ssl_context *ssl ) return( 0 ); } -void mbedtls_ssl_optimize_checksum( mbedtls_ssl_context *ssl, - const mbedtls_ssl_ciphersuite_t *ciphersuite_info ) -{ - ((void) ciphersuite_info); - -#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \ - defined(MBEDTLS_SSL_PROTO_TLS1_1) - if( ssl->minor_ver < MBEDTLS_SSL_MINOR_VERSION_3 ) - ssl->handshake->update_checksum = ssl_update_checksum_md5sha1; - else -#endif -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) -#if defined(MBEDTLS_SHA512_C) - if( ciphersuite_info->mac == MBEDTLS_MD_SHA384 ) - ssl->handshake->update_checksum = ssl_update_checksum_sha384; - else -#endif -#if defined(MBEDTLS_SHA256_C) - if( ciphersuite_info->mac != MBEDTLS_MD_SHA384 ) - ssl->handshake->update_checksum = ssl_update_checksum_sha256; - else -#endif -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return; - } -} - -void mbedtls_ssl_reset_checksum( mbedtls_ssl_context *ssl ) -{ -#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \ - defined(MBEDTLS_SSL_PROTO_TLS1_1) - mbedtls_md5_starts_ret( &ssl->handshake->fin_md5 ); - mbedtls_sha1_starts_ret( &ssl->handshake->fin_sha1 ); -#endif -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) -#if defined(MBEDTLS_SHA256_C) -#if defined(MBEDTLS_USE_PSA_CRYPTO) - psa_hash_abort( &ssl->handshake->fin_sha256_psa ); - psa_hash_setup( &ssl->handshake->fin_sha256_psa, PSA_ALG_SHA_256 ); -#else - mbedtls_sha256_starts_ret( &ssl->handshake->fin_sha256, 0 ); -#endif -#endif -#if defined(MBEDTLS_SHA512_C) -#if defined(MBEDTLS_USE_PSA_CRYPTO) - psa_hash_abort( &ssl->handshake->fin_sha384_psa ); - psa_hash_setup( &ssl->handshake->fin_sha384_psa, PSA_ALG_SHA_384 ); -#else - mbedtls_sha512_starts_ret( &ssl->handshake->fin_sha512, 1 ); -#endif -#endif -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ -} - -static void ssl_update_checksum_start( mbedtls_ssl_context *ssl, - const unsigned char *buf, size_t len ) -{ -#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \ - defined(MBEDTLS_SSL_PROTO_TLS1_1) - mbedtls_md5_update_ret( &ssl->handshake->fin_md5 , buf, len ); - mbedtls_sha1_update_ret( &ssl->handshake->fin_sha1, buf, len ); -#endif -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) -#if defined(MBEDTLS_SHA256_C) -#if defined(MBEDTLS_USE_PSA_CRYPTO) - psa_hash_update( &ssl->handshake->fin_sha256_psa, buf, len ); -#else - mbedtls_sha256_update_ret( &ssl->handshake->fin_sha256, buf, len ); -#endif -#endif -#if defined(MBEDTLS_SHA512_C) -#if defined(MBEDTLS_USE_PSA_CRYPTO) - psa_hash_update( &ssl->handshake->fin_sha384_psa, buf, len ); -#else - mbedtls_sha512_update_ret( &ssl->handshake->fin_sha512, buf, len ); -#endif -#endif -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ -} - -#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \ - defined(MBEDTLS_SSL_PROTO_TLS1_1) -static void ssl_update_checksum_md5sha1( mbedtls_ssl_context *ssl, - const unsigned char *buf, size_t len ) -{ - mbedtls_md5_update_ret( &ssl->handshake->fin_md5 , buf, len ); - mbedtls_sha1_update_ret( &ssl->handshake->fin_sha1, buf, len ); -} -#endif - -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) -#if defined(MBEDTLS_SHA256_C) -static void ssl_update_checksum_sha256( mbedtls_ssl_context *ssl, - const unsigned char *buf, size_t len ) -{ -#if defined(MBEDTLS_USE_PSA_CRYPTO) - psa_hash_update( &ssl->handshake->fin_sha256_psa, buf, len ); -#else - mbedtls_sha256_update_ret( &ssl->handshake->fin_sha256, buf, len ); -#endif -} -#endif - -#if defined(MBEDTLS_SHA512_C) -static void ssl_update_checksum_sha384( mbedtls_ssl_context *ssl, - const unsigned char *buf, size_t len ) -{ -#if defined(MBEDTLS_USE_PSA_CRYPTO) - psa_hash_update( &ssl->handshake->fin_sha384_psa, buf, len ); -#else - mbedtls_sha512_update_ret( &ssl->handshake->fin_sha512, buf, len ); -#endif -} -#endif -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ - -#if defined(MBEDTLS_SSL_PROTO_SSL3) -static void ssl_calc_finished_ssl( - mbedtls_ssl_context *ssl, unsigned char *buf, int from ) -{ - const char *sender; - mbedtls_md5_context md5; - mbedtls_sha1_context sha1; - - unsigned char padbuf[48]; - unsigned char md5sum[16]; - unsigned char sha1sum[20]; - - mbedtls_ssl_session *session = ssl->session_negotiate; - if( !session ) - session = ssl->session; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc finished ssl" ) ); - - mbedtls_md5_init( &md5 ); - mbedtls_sha1_init( &sha1 ); - - mbedtls_md5_clone( &md5, &ssl->handshake->fin_md5 ); - mbedtls_sha1_clone( &sha1, &ssl->handshake->fin_sha1 ); - - /* - * SSLv3: - * hash = - * MD5( master + pad2 + - * MD5( handshake + sender + master + pad1 ) ) - * + SHA1( master + pad2 + - * SHA1( handshake + sender + master + pad1 ) ) - */ - -#if !defined(MBEDTLS_MD5_ALT) - MBEDTLS_SSL_DEBUG_BUF( 4, "finished md5 state", (unsigned char *) - md5.state, sizeof( md5.state ) ); -#endif - -#if !defined(MBEDTLS_SHA1_ALT) - MBEDTLS_SSL_DEBUG_BUF( 4, "finished sha1 state", (unsigned char *) - sha1.state, sizeof( sha1.state ) ); -#endif - - sender = ( from == MBEDTLS_SSL_IS_CLIENT ) ? "CLNT" - : "SRVR"; - - memset( padbuf, 0x36, 48 ); - - mbedtls_md5_update_ret( &md5, (const unsigned char *) sender, 4 ); - mbedtls_md5_update_ret( &md5, session->master, 48 ); - mbedtls_md5_update_ret( &md5, padbuf, 48 ); - mbedtls_md5_finish_ret( &md5, md5sum ); - - mbedtls_sha1_update_ret( &sha1, (const unsigned char *) sender, 4 ); - mbedtls_sha1_update_ret( &sha1, session->master, 48 ); - mbedtls_sha1_update_ret( &sha1, padbuf, 40 ); - mbedtls_sha1_finish_ret( &sha1, sha1sum ); - - memset( padbuf, 0x5C, 48 ); - - mbedtls_md5_starts_ret( &md5 ); - mbedtls_md5_update_ret( &md5, session->master, 48 ); - mbedtls_md5_update_ret( &md5, padbuf, 48 ); - mbedtls_md5_update_ret( &md5, md5sum, 16 ); - mbedtls_md5_finish_ret( &md5, buf ); - - mbedtls_sha1_starts_ret( &sha1 ); - mbedtls_sha1_update_ret( &sha1, session->master, 48 ); - mbedtls_sha1_update_ret( &sha1, padbuf , 40 ); - mbedtls_sha1_update_ret( &sha1, sha1sum, 20 ); - mbedtls_sha1_finish_ret( &sha1, buf + 16 ); - - MBEDTLS_SSL_DEBUG_BUF( 3, "calc finished result", buf, 36 ); - - mbedtls_md5_free( &md5 ); - mbedtls_sha1_free( &sha1 ); - - mbedtls_platform_zeroize( padbuf, sizeof( padbuf ) ); - mbedtls_platform_zeroize( md5sum, sizeof( md5sum ) ); - mbedtls_platform_zeroize( sha1sum, sizeof( sha1sum ) ); - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc finished" ) ); -} -#endif /* MBEDTLS_SSL_PROTO_SSL3 */ - -#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) -static void ssl_calc_finished_tls( - mbedtls_ssl_context *ssl, unsigned char *buf, int from ) -{ - int len = 12; - const char *sender; - mbedtls_md5_context md5; - mbedtls_sha1_context sha1; - unsigned char padbuf[36]; - - mbedtls_ssl_session *session = ssl->session_negotiate; - if( !session ) - session = ssl->session; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc finished tls" ) ); - - mbedtls_md5_init( &md5 ); - mbedtls_sha1_init( &sha1 ); - - mbedtls_md5_clone( &md5, &ssl->handshake->fin_md5 ); - mbedtls_sha1_clone( &sha1, &ssl->handshake->fin_sha1 ); - - /* - * TLSv1: - * hash = PRF( master, finished_label, - * MD5( handshake ) + SHA1( handshake ) )[0..11] - */ - -#if !defined(MBEDTLS_MD5_ALT) - MBEDTLS_SSL_DEBUG_BUF( 4, "finished md5 state", (unsigned char *) - md5.state, sizeof( md5.state ) ); -#endif - -#if !defined(MBEDTLS_SHA1_ALT) - MBEDTLS_SSL_DEBUG_BUF( 4, "finished sha1 state", (unsigned char *) - sha1.state, sizeof( sha1.state ) ); -#endif - - sender = ( from == MBEDTLS_SSL_IS_CLIENT ) - ? "client finished" - : "server finished"; - - mbedtls_md5_finish_ret( &md5, padbuf ); - mbedtls_sha1_finish_ret( &sha1, padbuf + 16 ); - - ssl->handshake->tls_prf( session->master, 48, sender, - padbuf, 36, buf, len ); - - MBEDTLS_SSL_DEBUG_BUF( 3, "calc finished result", buf, len ); - - mbedtls_md5_free( &md5 ); - mbedtls_sha1_free( &sha1 ); - - mbedtls_platform_zeroize( padbuf, sizeof( padbuf ) ); - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc finished" ) ); -} -#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 */ - -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) -#if defined(MBEDTLS_SHA256_C) -static void ssl_calc_finished_tls_sha256( - mbedtls_ssl_context *ssl, unsigned char *buf, int from ) -{ - int len = 12; - const char *sender; - unsigned char padbuf[32]; -#if defined(MBEDTLS_USE_PSA_CRYPTO) - size_t hash_size; - psa_hash_operation_t sha256_psa = PSA_HASH_OPERATION_INIT; - psa_status_t status; -#else - mbedtls_sha256_context sha256; -#endif - - mbedtls_ssl_session *session = ssl->session_negotiate; - if( !session ) - session = ssl->session; - - sender = ( from == MBEDTLS_SSL_IS_CLIENT ) - ? "client finished" - : "server finished"; - -#if defined(MBEDTLS_USE_PSA_CRYPTO) - sha256_psa = psa_hash_operation_init(); - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc PSA finished tls sha256" ) ); - - status = psa_hash_clone( &ssl->handshake->fin_sha256_psa, &sha256_psa ); - if( status != PSA_SUCCESS ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "PSA hash clone failed" ) ); - return; - } - - status = psa_hash_finish( &sha256_psa, padbuf, sizeof( padbuf ), &hash_size ); - if( status != PSA_SUCCESS ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "PSA hash finish failed" ) ); - return; - } - MBEDTLS_SSL_DEBUG_BUF( 3, "PSA calculated padbuf", padbuf, 32 ); -#else - - mbedtls_sha256_init( &sha256 ); - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc finished tls sha256" ) ); - - mbedtls_sha256_clone( &sha256, &ssl->handshake->fin_sha256 ); - - /* - * TLSv1.2: - * hash = PRF( master, finished_label, - * Hash( handshake ) )[0.11] - */ - -#if !defined(MBEDTLS_SHA256_ALT) - MBEDTLS_SSL_DEBUG_BUF( 4, "finished sha2 state", (unsigned char *) - sha256.state, sizeof( sha256.state ) ); -#endif - - mbedtls_sha256_finish_ret( &sha256, padbuf ); - mbedtls_sha256_free( &sha256 ); -#endif /* MBEDTLS_USE_PSA_CRYPTO */ - - ssl->handshake->tls_prf( session->master, 48, sender, - padbuf, 32, buf, len ); - - MBEDTLS_SSL_DEBUG_BUF( 3, "calc finished result", buf, len ); - - mbedtls_platform_zeroize( padbuf, sizeof( padbuf ) ); - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc finished" ) ); -} -#endif /* MBEDTLS_SHA256_C */ - -#if defined(MBEDTLS_SHA512_C) -static void ssl_calc_finished_tls_sha384( - mbedtls_ssl_context *ssl, unsigned char *buf, int from ) -{ - int len = 12; - const char *sender; - unsigned char padbuf[48]; -#if defined(MBEDTLS_USE_PSA_CRYPTO) - size_t hash_size; - psa_hash_operation_t sha384_psa = PSA_HASH_OPERATION_INIT; - psa_status_t status; -#else - mbedtls_sha512_context sha512; -#endif - - mbedtls_ssl_session *session = ssl->session_negotiate; - if( !session ) - session = ssl->session; - - sender = ( from == MBEDTLS_SSL_IS_CLIENT ) - ? "client finished" - : "server finished"; - -#if defined(MBEDTLS_USE_PSA_CRYPTO) - sha384_psa = psa_hash_operation_init(); - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc PSA finished tls sha384" ) ); - - status = psa_hash_clone( &ssl->handshake->fin_sha384_psa, &sha384_psa ); - if( status != PSA_SUCCESS ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "PSA hash clone failed" ) ); - return; - } - - status = psa_hash_finish( &sha384_psa, padbuf, sizeof( padbuf ), &hash_size ); - if( status != PSA_SUCCESS ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "PSA hash finish failed" ) ); - return; - } - MBEDTLS_SSL_DEBUG_BUF( 3, "PSA calculated padbuf", padbuf, 48 ); -#else - mbedtls_sha512_init( &sha512 ); - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc finished tls sha384" ) ); - - mbedtls_sha512_clone( &sha512, &ssl->handshake->fin_sha512 ); - - /* - * TLSv1.2: - * hash = PRF( master, finished_label, - * Hash( handshake ) )[0.11] - */ - -#if !defined(MBEDTLS_SHA512_ALT) - MBEDTLS_SSL_DEBUG_BUF( 4, "finished sha512 state", (unsigned char *) - sha512.state, sizeof( sha512.state ) ); -#endif - - mbedtls_sha512_finish_ret( &sha512, padbuf ); - mbedtls_sha512_free( &sha512 ); -#endif - - ssl->handshake->tls_prf( session->master, 48, sender, - padbuf, 48, buf, len ); - - MBEDTLS_SSL_DEBUG_BUF( 3, "calc finished result", buf, len ); - - mbedtls_platform_zeroize( padbuf, sizeof( padbuf ) ); - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc finished" ) ); -} -#endif /* MBEDTLS_SHA512_C */ -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ - -void mbedtls_ssl_handshake_wrapup_free_hs_transform( mbedtls_ssl_context *ssl ) -{ - MBEDTLS_SSL_DEBUG_MSG( 3, ( "=> handshake wrapup: final free" ) ); - - /* - * Free our handshake params - */ - mbedtls_ssl_handshake_free( ssl ); - mbedtls_free( ssl->handshake ); - ssl->handshake = NULL; - - /* - * Free the previous transform and swith in the current one - */ - if( ssl->transform ) - { - mbedtls_ssl_transform_free( ssl->transform ); - mbedtls_free( ssl->transform ); - } - ssl->transform = ssl->transform_negotiate; - ssl->transform_negotiate = NULL; - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "<= handshake wrapup: final free" ) ); -} - -void mbedtls_ssl_handshake_wrapup( mbedtls_ssl_context *ssl ) -{ - int resume = ssl->handshake->resume; - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "=> handshake wrapup" ) ); - -#if defined(MBEDTLS_SSL_RENEGOTIATION) - if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS ) - { - ssl->renego_status = MBEDTLS_SSL_RENEGOTIATION_DONE; - ssl->renego_records_seen = 0; - } -#endif - - /* - * Free the previous session and switch in the current one - */ - if( ssl->session ) - { -#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) - /* RFC 7366 3.1: keep the EtM state */ - ssl->session_negotiate->encrypt_then_mac = - ssl->session->encrypt_then_mac; -#endif - - mbedtls_ssl_session_free( ssl->session ); - mbedtls_free( ssl->session ); - } - ssl->session = ssl->session_negotiate; - ssl->session_negotiate = NULL; - - /* - * Add cache entry - */ - if( ssl->conf->f_set_cache != NULL && - ssl->session->id_len != 0 && - resume == 0 ) - { - if( ssl->conf->f_set_cache( ssl->conf->p_cache, ssl->session ) != 0 ) - MBEDTLS_SSL_DEBUG_MSG( 1, ( "cache did not store session" ) ); - } - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && - ssl->handshake->flight != NULL ) - { - /* Cancel handshake timer */ - mbedtls_ssl_set_timer( ssl, 0 ); - - /* Keep last flight around in case we need to resend it: - * we need the handshake and transform structures for that */ - MBEDTLS_SSL_DEBUG_MSG( 3, ( "skip freeing handshake and transform" ) ); - } - else -#endif - mbedtls_ssl_handshake_wrapup_free_hs_transform( ssl ); - - ssl->state++; - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "<= handshake wrapup" ) ); -} - -int mbedtls_ssl_write_finished( mbedtls_ssl_context *ssl ) -{ - int ret, hash_len; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write finished" ) ); - - mbedtls_ssl_update_out_pointers( ssl, ssl->transform_negotiate ); - - ssl->handshake->calc_finished( ssl, ssl->out_msg + 4, ssl->conf->endpoint ); - - /* - * RFC 5246 7.4.9 (Page 63) says 12 is the default length and ciphersuites - * may define some other value. Currently (early 2016), no defined - * ciphersuite does this (and this is unlikely to change as activity has - * moved to TLS 1.3 now) so we can keep the hardcoded 12 here. - */ - hash_len = ( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) ? 36 : 12; - -#if defined(MBEDTLS_SSL_RENEGOTIATION) - ssl->verify_data_len = hash_len; - memcpy( ssl->own_verify_data, ssl->out_msg + 4, hash_len ); -#endif - - ssl->out_msglen = 4 + hash_len; - ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE; - ssl->out_msg[0] = MBEDTLS_SSL_HS_FINISHED; - - /* - * In case of session resuming, invert the client and server - * ChangeCipherSpec messages order. - */ - if( ssl->handshake->resume != 0 ) - { -#if defined(MBEDTLS_SSL_CLI_C) - if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT ) - ssl->state = MBEDTLS_SSL_HANDSHAKE_WRAPUP; -#endif -#if defined(MBEDTLS_SSL_SRV_C) - if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER ) - ssl->state = MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC; -#endif - } - else - ssl->state++; - - /* - * Switch to our negotiated transform and session parameters for outbound - * data. - */ - MBEDTLS_SSL_DEBUG_MSG( 3, ( "switching to new transform spec for outbound data" ) ); - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - { - unsigned char i; - - /* Remember current epoch settings for resending */ - ssl->handshake->alt_transform_out = ssl->transform_out; - memcpy( ssl->handshake->alt_out_ctr, ssl->cur_out_ctr, 8 ); - - /* Set sequence_number to zero */ - memset( ssl->cur_out_ctr + 2, 0, 6 ); - - /* Increment epoch */ - for( i = 2; i > 0; i-- ) - if( ++ssl->cur_out_ctr[i - 1] != 0 ) - break; - - /* The loop goes to its end iff the counter is wrapping */ - if( i == 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "DTLS epoch would wrap" ) ); - return( MBEDTLS_ERR_SSL_COUNTER_WRAPPING ); - } - } - else -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - memset( ssl->cur_out_ctr, 0, 8 ); - - ssl->transform_out = ssl->transform_negotiate; - ssl->session_out = ssl->session_negotiate; - -#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL) - if( mbedtls_ssl_hw_record_activate != NULL ) - { - if( ( ret = mbedtls_ssl_hw_record_activate( ssl, MBEDTLS_SSL_CHANNEL_OUTBOUND ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_activate", ret ); - return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED ); - } - } -#endif - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - mbedtls_ssl_send_flight_completed( ssl ); -#endif - - if( ( ret = mbedtls_ssl_write_handshake_msg( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_handshake_msg", ret ); - return( ret ); - } - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && - ( ret = mbedtls_ssl_flight_transmit( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_flight_transmit", ret ); - return( ret ); - } -#endif - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write finished" ) ); - - return( 0 ); -} - -#if defined(MBEDTLS_SSL_PROTO_SSL3) -#define SSL_MAX_HASH_LEN 36 -#else -#define SSL_MAX_HASH_LEN 12 -#endif - -int mbedtls_ssl_parse_finished( mbedtls_ssl_context *ssl ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - unsigned int hash_len; - unsigned char buf[SSL_MAX_HASH_LEN]; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse finished" ) ); - - ssl->handshake->calc_finished( ssl, buf, ssl->conf->endpoint ^ 1 ); - - if( ( ret = mbedtls_ssl_read_record( ssl, 1 ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret ); - return( ret ); - } - - if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad finished message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE ); - return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE ); - } - - /* There is currently no ciphersuite using another length with TLS 1.2 */ -#if defined(MBEDTLS_SSL_PROTO_SSL3) - if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) - hash_len = 36; - else -#endif - hash_len = 12; - - if( ssl->in_msg[0] != MBEDTLS_SSL_HS_FINISHED || - ssl->in_hslen != mbedtls_ssl_hs_hdr_len( ssl ) + hash_len ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad finished message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_FINISHED ); - } - - if( mbedtls_ssl_safer_memcmp( ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl ), - buf, hash_len ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad finished message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_FINISHED ); - } - -#if defined(MBEDTLS_SSL_RENEGOTIATION) - ssl->verify_data_len = hash_len; - memcpy( ssl->peer_verify_data, buf, hash_len ); -#endif - - if( ssl->handshake->resume != 0 ) - { -#if defined(MBEDTLS_SSL_CLI_C) - if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT ) - ssl->state = MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC; -#endif -#if defined(MBEDTLS_SSL_SRV_C) - if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER ) - ssl->state = MBEDTLS_SSL_HANDSHAKE_WRAPUP; -#endif - } - else - ssl->state++; - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - mbedtls_ssl_recv_flight_completed( ssl ); -#endif - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse finished" ) ); - - return( 0 ); -} - -static void ssl_handshake_params_init( mbedtls_ssl_handshake_params *handshake ) -{ - memset( handshake, 0, sizeof( mbedtls_ssl_handshake_params ) ); - -#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \ - defined(MBEDTLS_SSL_PROTO_TLS1_1) - mbedtls_md5_init( &handshake->fin_md5 ); - mbedtls_sha1_init( &handshake->fin_sha1 ); - mbedtls_md5_starts_ret( &handshake->fin_md5 ); - mbedtls_sha1_starts_ret( &handshake->fin_sha1 ); -#endif -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) -#if defined(MBEDTLS_SHA256_C) -#if defined(MBEDTLS_USE_PSA_CRYPTO) - handshake->fin_sha256_psa = psa_hash_operation_init(); - psa_hash_setup( &handshake->fin_sha256_psa, PSA_ALG_SHA_256 ); -#else - mbedtls_sha256_init( &handshake->fin_sha256 ); - mbedtls_sha256_starts_ret( &handshake->fin_sha256, 0 ); -#endif -#endif -#if defined(MBEDTLS_SHA512_C) -#if defined(MBEDTLS_USE_PSA_CRYPTO) - handshake->fin_sha384_psa = psa_hash_operation_init(); - psa_hash_setup( &handshake->fin_sha384_psa, PSA_ALG_SHA_384 ); -#else - mbedtls_sha512_init( &handshake->fin_sha512 ); - mbedtls_sha512_starts_ret( &handshake->fin_sha512, 1 ); -#endif -#endif -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ - - handshake->update_checksum = ssl_update_checksum_start; - -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \ - defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) - mbedtls_ssl_sig_hash_set_init( &handshake->hash_algs ); -#endif - -#if defined(MBEDTLS_DHM_C) - mbedtls_dhm_init( &handshake->dhm_ctx ); -#endif -#if defined(MBEDTLS_ECDH_C) - mbedtls_ecdh_init( &handshake->ecdh_ctx ); -#endif -#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) - mbedtls_ecjpake_init( &handshake->ecjpake_ctx ); -#if defined(MBEDTLS_SSL_CLI_C) - handshake->ecjpake_cache = NULL; - handshake->ecjpake_cache_len = 0; -#endif -#endif - -#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) - mbedtls_x509_crt_restart_init( &handshake->ecrs_ctx ); -#endif - -#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) - handshake->sni_authmode = MBEDTLS_SSL_VERIFY_UNSET; -#endif - -#if defined(MBEDTLS_X509_CRT_PARSE_C) && \ - !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) - mbedtls_pk_init( &handshake->peer_pubkey ); -#endif -} - -void mbedtls_ssl_transform_init( mbedtls_ssl_transform *transform ) -{ - memset( transform, 0, sizeof(mbedtls_ssl_transform) ); - - mbedtls_cipher_init( &transform->cipher_ctx_enc ); - mbedtls_cipher_init( &transform->cipher_ctx_dec ); - -#if defined(MBEDTLS_SSL_SOME_MODES_USE_MAC) - mbedtls_md_init( &transform->md_ctx_enc ); - mbedtls_md_init( &transform->md_ctx_dec ); -#endif -} - -void mbedtls_ssl_session_init( mbedtls_ssl_session *session ) -{ - memset( session, 0, sizeof(mbedtls_ssl_session) ); -} - -static int ssl_handshake_init( mbedtls_ssl_context *ssl ) -{ - /* Clear old handshake information if present */ - if( ssl->transform_negotiate ) - mbedtls_ssl_transform_free( ssl->transform_negotiate ); - if( ssl->session_negotiate ) - mbedtls_ssl_session_free( ssl->session_negotiate ); - if( ssl->handshake ) - mbedtls_ssl_handshake_free( ssl ); - - /* - * Either the pointers are now NULL or cleared properly and can be freed. - * Now allocate missing structures. - */ - if( ssl->transform_negotiate == NULL ) - { - ssl->transform_negotiate = mbedtls_calloc( 1, sizeof(mbedtls_ssl_transform) ); - } - - if( ssl->session_negotiate == NULL ) - { - ssl->session_negotiate = mbedtls_calloc( 1, sizeof(mbedtls_ssl_session) ); - } - - if( ssl->handshake == NULL ) - { - ssl->handshake = mbedtls_calloc( 1, sizeof(mbedtls_ssl_handshake_params) ); - } - - /* All pointers should exist and can be directly freed without issue */ - if( ssl->handshake == NULL || - ssl->transform_negotiate == NULL || - ssl->session_negotiate == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc() of ssl sub-contexts failed" ) ); - - mbedtls_free( ssl->handshake ); - mbedtls_free( ssl->transform_negotiate ); - mbedtls_free( ssl->session_negotiate ); - - ssl->handshake = NULL; - ssl->transform_negotiate = NULL; - ssl->session_negotiate = NULL; - - return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); - } - - /* Initialize structures */ - mbedtls_ssl_session_init( ssl->session_negotiate ); - mbedtls_ssl_transform_init( ssl->transform_negotiate ); - ssl_handshake_params_init( ssl->handshake ); - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - { - ssl->handshake->alt_transform_out = ssl->transform_out; - - if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT ) - ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_PREPARING; - else - ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_WAITING; - - mbedtls_ssl_set_timer( ssl, 0 ); - } -#endif - - return( 0 ); -} - -#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C) -/* Dummy cookie callbacks for defaults */ -static int ssl_cookie_write_dummy( void *ctx, - unsigned char **p, unsigned char *end, - const unsigned char *cli_id, size_t cli_id_len ) -{ - ((void) ctx); - ((void) p); - ((void) end); - ((void) cli_id); - ((void) cli_id_len); - - return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE ); -} - -static int ssl_cookie_check_dummy( void *ctx, - const unsigned char *cookie, size_t cookie_len, - const unsigned char *cli_id, size_t cli_id_len ) -{ - ((void) ctx); - ((void) cookie); - ((void) cookie_len); - ((void) cli_id); - ((void) cli_id_len); - - return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE ); -} -#endif /* MBEDTLS_SSL_DTLS_HELLO_VERIFY && MBEDTLS_SSL_SRV_C */ - /* Once ssl->out_hdr as the address of the beginning of the * next outgoing record is set, deduce the other pointers. * @@ -8555,14 +4860,6 @@ void mbedtls_ssl_update_in_pointers( mbedtls_ssl_context *ssl ) ssl->in_msg = ssl->in_iv; } -/* - * Initialize an SSL context - */ -void mbedtls_ssl_init( mbedtls_ssl_context *ssl ) -{ - memset( ssl, 0, sizeof( mbedtls_ssl_context ) ); -} - /* * Setup an SSL context */ @@ -8588,1027 +4885,6 @@ void mbedtls_ssl_reset_in_out_pointers( mbedtls_ssl_context *ssl ) mbedtls_ssl_update_in_pointers ( ssl ); } -int mbedtls_ssl_setup( mbedtls_ssl_context *ssl, - const mbedtls_ssl_config *conf ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - - ssl->conf = conf; - - /* - * Prepare base structures - */ - - /* Set to NULL in case of an error condition */ - ssl->out_buf = NULL; - - ssl->in_buf = mbedtls_calloc( 1, MBEDTLS_SSL_IN_BUFFER_LEN ); - if( ssl->in_buf == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc(%d bytes) failed", MBEDTLS_SSL_IN_BUFFER_LEN) ); - ret = MBEDTLS_ERR_SSL_ALLOC_FAILED; - goto error; - } - - ssl->out_buf = mbedtls_calloc( 1, MBEDTLS_SSL_OUT_BUFFER_LEN ); - if( ssl->out_buf == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc(%d bytes) failed", MBEDTLS_SSL_OUT_BUFFER_LEN) ); - ret = MBEDTLS_ERR_SSL_ALLOC_FAILED; - goto error; - } - - mbedtls_ssl_reset_in_out_pointers( ssl ); - - if( ( ret = ssl_handshake_init( ssl ) ) != 0 ) - goto error; - - return( 0 ); - -error: - mbedtls_free( ssl->in_buf ); - mbedtls_free( ssl->out_buf ); - - ssl->conf = NULL; - - ssl->in_buf = NULL; - ssl->out_buf = NULL; - - ssl->in_hdr = NULL; - ssl->in_ctr = NULL; - ssl->in_len = NULL; - ssl->in_iv = NULL; - ssl->in_msg = NULL; - - ssl->out_hdr = NULL; - ssl->out_ctr = NULL; - ssl->out_len = NULL; - ssl->out_iv = NULL; - ssl->out_msg = NULL; - - return( ret ); -} - -/* - * Reset an initialized and used SSL context for re-use while retaining - * all application-set variables, function pointers and data. - * - * If partial is non-zero, keep data in the input buffer and client ID. - * (Use when a DTLS client reconnects from the same port.) - */ -int mbedtls_ssl_session_reset_int( mbedtls_ssl_context *ssl, int partial ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - -#if !defined(MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE) || \ - !defined(MBEDTLS_SSL_SRV_C) - ((void) partial); -#endif - - ssl->state = MBEDTLS_SSL_HELLO_REQUEST; - - /* Cancel any possibly running timer */ - mbedtls_ssl_set_timer( ssl, 0 ); - -#if defined(MBEDTLS_SSL_RENEGOTIATION) - ssl->renego_status = MBEDTLS_SSL_INITIAL_HANDSHAKE; - ssl->renego_records_seen = 0; - - ssl->verify_data_len = 0; - memset( ssl->own_verify_data, 0, MBEDTLS_SSL_VERIFY_DATA_MAX_LEN ); - memset( ssl->peer_verify_data, 0, MBEDTLS_SSL_VERIFY_DATA_MAX_LEN ); -#endif - ssl->secure_renegotiation = MBEDTLS_SSL_LEGACY_RENEGOTIATION; - - ssl->in_offt = NULL; - mbedtls_ssl_reset_in_out_pointers( ssl ); - - ssl->in_msgtype = 0; - ssl->in_msglen = 0; -#if defined(MBEDTLS_SSL_PROTO_DTLS) - ssl->next_record_offset = 0; - ssl->in_epoch = 0; -#endif -#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY) - mbedtls_ssl_dtls_replay_reset( ssl ); -#endif - - ssl->in_hslen = 0; - ssl->nb_zero = 0; - - ssl->keep_current_message = 0; - - ssl->out_msgtype = 0; - ssl->out_msglen = 0; - ssl->out_left = 0; -#if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING) - if( ssl->split_done != MBEDTLS_SSL_CBC_RECORD_SPLITTING_DISABLED ) - ssl->split_done = 0; -#endif - - memset( ssl->cur_out_ctr, 0, sizeof( ssl->cur_out_ctr ) ); - - ssl->transform_in = NULL; - ssl->transform_out = NULL; - - ssl->session_in = NULL; - ssl->session_out = NULL; - - memset( ssl->out_buf, 0, MBEDTLS_SSL_OUT_BUFFER_LEN ); - -#if defined(MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE) && defined(MBEDTLS_SSL_SRV_C) - if( partial == 0 ) -#endif /* MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE && MBEDTLS_SSL_SRV_C */ - { - ssl->in_left = 0; - memset( ssl->in_buf, 0, MBEDTLS_SSL_IN_BUFFER_LEN ); - } - -#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL) - if( mbedtls_ssl_hw_record_reset != NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "going for mbedtls_ssl_hw_record_reset()" ) ); - if( ( ret = mbedtls_ssl_hw_record_reset( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_reset", ret ); - return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED ); - } - } -#endif - - if( ssl->transform ) - { - mbedtls_ssl_transform_free( ssl->transform ); - mbedtls_free( ssl->transform ); - ssl->transform = NULL; - } - - if( ssl->session ) - { - mbedtls_ssl_session_free( ssl->session ); - mbedtls_free( ssl->session ); - ssl->session = NULL; - } - -#if defined(MBEDTLS_SSL_ALPN) - ssl->alpn_chosen = NULL; -#endif - -#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C) -#if defined(MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE) - if( partial == 0 ) -#endif - { - mbedtls_free( ssl->cli_id ); - ssl->cli_id = NULL; - ssl->cli_id_len = 0; - } -#endif - - if( ( ret = ssl_handshake_init( ssl ) ) != 0 ) - return( ret ); - - return( 0 ); -} - -/* - * Reset an initialized and used SSL context for re-use while retaining - * all application-set variables, function pointers and data. - */ -int mbedtls_ssl_session_reset( mbedtls_ssl_context *ssl ) -{ - return( mbedtls_ssl_session_reset_int( ssl, 0 ) ); -} - -/* - * SSL set accessors - */ -void mbedtls_ssl_conf_endpoint( mbedtls_ssl_config *conf, int endpoint ) -{ - conf->endpoint = endpoint; -} - -void mbedtls_ssl_conf_transport( mbedtls_ssl_config *conf, int transport ) -{ - conf->transport = transport; -} - -#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY) -void mbedtls_ssl_conf_dtls_anti_replay( mbedtls_ssl_config *conf, char mode ) -{ - conf->anti_replay = mode; -} -#endif - -#if defined(MBEDTLS_SSL_DTLS_BADMAC_LIMIT) -void mbedtls_ssl_conf_dtls_badmac_limit( mbedtls_ssl_config *conf, unsigned limit ) -{ - conf->badmac_limit = limit; -} -#endif - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - -void mbedtls_ssl_set_datagram_packing( mbedtls_ssl_context *ssl, - unsigned allow_packing ) -{ - ssl->disable_datagram_packing = !allow_packing; -} - -void mbedtls_ssl_conf_handshake_timeout( mbedtls_ssl_config *conf, - uint32_t min, uint32_t max ) -{ - conf->hs_timeout_min = min; - conf->hs_timeout_max = max; -} -#endif - -void mbedtls_ssl_conf_authmode( mbedtls_ssl_config *conf, int authmode ) -{ - conf->authmode = authmode; -} - -#if defined(MBEDTLS_X509_CRT_PARSE_C) -void mbedtls_ssl_conf_verify( mbedtls_ssl_config *conf, - int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *), - void *p_vrfy ) -{ - conf->f_vrfy = f_vrfy; - conf->p_vrfy = p_vrfy; -} -#endif /* MBEDTLS_X509_CRT_PARSE_C */ - -void mbedtls_ssl_conf_rng( mbedtls_ssl_config *conf, - int (*f_rng)(void *, unsigned char *, size_t), - void *p_rng ) -{ - conf->f_rng = f_rng; - conf->p_rng = p_rng; -} - -void mbedtls_ssl_conf_dbg( mbedtls_ssl_config *conf, - void (*f_dbg)(void *, int, const char *, int, const char *), - void *p_dbg ) -{ - conf->f_dbg = f_dbg; - conf->p_dbg = p_dbg; -} - -void mbedtls_ssl_set_bio( mbedtls_ssl_context *ssl, - void *p_bio, - mbedtls_ssl_send_t *f_send, - mbedtls_ssl_recv_t *f_recv, - mbedtls_ssl_recv_timeout_t *f_recv_timeout ) -{ - ssl->p_bio = p_bio; - ssl->f_send = f_send; - ssl->f_recv = f_recv; - ssl->f_recv_timeout = f_recv_timeout; -} - -#if defined(MBEDTLS_SSL_PROTO_DTLS) -void mbedtls_ssl_set_mtu( mbedtls_ssl_context *ssl, uint16_t mtu ) -{ - ssl->mtu = mtu; -} -#endif - -void mbedtls_ssl_conf_read_timeout( mbedtls_ssl_config *conf, uint32_t timeout ) -{ - conf->read_timeout = timeout; -} - -void mbedtls_ssl_set_timer_cb( mbedtls_ssl_context *ssl, - void *p_timer, - mbedtls_ssl_set_timer_t *f_set_timer, - mbedtls_ssl_get_timer_t *f_get_timer ) -{ - ssl->p_timer = p_timer; - ssl->f_set_timer = f_set_timer; - ssl->f_get_timer = f_get_timer; - - /* Make sure we start with no timer running */ - mbedtls_ssl_set_timer( ssl, 0 ); -} - -#if defined(MBEDTLS_SSL_SRV_C) -void mbedtls_ssl_conf_session_cache( mbedtls_ssl_config *conf, - void *p_cache, - int (*f_get_cache)(void *, mbedtls_ssl_session *), - int (*f_set_cache)(void *, const mbedtls_ssl_session *) ) -{ - conf->p_cache = p_cache; - conf->f_get_cache = f_get_cache; - conf->f_set_cache = f_set_cache; -} -#endif /* MBEDTLS_SSL_SRV_C */ - -#if defined(MBEDTLS_SSL_CLI_C) -int mbedtls_ssl_set_session( mbedtls_ssl_context *ssl, const mbedtls_ssl_session *session ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - - if( ssl == NULL || - session == NULL || - ssl->session_negotiate == NULL || - ssl->conf->endpoint != MBEDTLS_SSL_IS_CLIENT ) - { - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - - if( ( ret = mbedtls_ssl_session_copy( ssl->session_negotiate, - session ) ) != 0 ) - return( ret ); - - ssl->handshake->resume = 1; - - return( 0 ); -} -#endif /* MBEDTLS_SSL_CLI_C */ - -void mbedtls_ssl_conf_ciphersuites( mbedtls_ssl_config *conf, - const int *ciphersuites ) -{ - conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_0] = ciphersuites; - conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_1] = ciphersuites; - conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_2] = ciphersuites; - conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_3] = ciphersuites; -} - -void mbedtls_ssl_conf_ciphersuites_for_version( mbedtls_ssl_config *conf, - const int *ciphersuites, - int major, int minor ) -{ - if( major != MBEDTLS_SSL_MAJOR_VERSION_3 ) - return; - - if( minor < MBEDTLS_SSL_MINOR_VERSION_0 || minor > MBEDTLS_SSL_MINOR_VERSION_3 ) - return; - - conf->ciphersuite_list[minor] = ciphersuites; -} - -#if defined(MBEDTLS_X509_CRT_PARSE_C) -void mbedtls_ssl_conf_cert_profile( mbedtls_ssl_config *conf, - const mbedtls_x509_crt_profile *profile ) -{ - conf->cert_profile = profile; -} - -/* Append a new keycert entry to a (possibly empty) list */ -static int ssl_append_key_cert( mbedtls_ssl_key_cert **head, - mbedtls_x509_crt *cert, - mbedtls_pk_context *key ) -{ - mbedtls_ssl_key_cert *new_cert; - - new_cert = mbedtls_calloc( 1, sizeof( mbedtls_ssl_key_cert ) ); - if( new_cert == NULL ) - return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); - - new_cert->cert = cert; - new_cert->key = key; - new_cert->next = NULL; - - /* Update head is the list was null, else add to the end */ - if( *head == NULL ) - { - *head = new_cert; - } - else - { - mbedtls_ssl_key_cert *cur = *head; - while( cur->next != NULL ) - cur = cur->next; - cur->next = new_cert; - } - - return( 0 ); -} - -int mbedtls_ssl_conf_own_cert( mbedtls_ssl_config *conf, - mbedtls_x509_crt *own_cert, - mbedtls_pk_context *pk_key ) -{ - return( ssl_append_key_cert( &conf->key_cert, own_cert, pk_key ) ); -} - -void mbedtls_ssl_conf_ca_chain( mbedtls_ssl_config *conf, - mbedtls_x509_crt *ca_chain, - mbedtls_x509_crl *ca_crl ) -{ - conf->ca_chain = ca_chain; - conf->ca_crl = ca_crl; - -#if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK) - /* mbedtls_ssl_conf_ca_chain() and mbedtls_ssl_conf_ca_cb() - * cannot be used together. */ - conf->f_ca_cb = NULL; - conf->p_ca_cb = NULL; -#endif /* MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK */ -} - -#if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK) -void mbedtls_ssl_conf_ca_cb( mbedtls_ssl_config *conf, - mbedtls_x509_crt_ca_cb_t f_ca_cb, - void *p_ca_cb ) -{ - conf->f_ca_cb = f_ca_cb; - conf->p_ca_cb = p_ca_cb; - - /* mbedtls_ssl_conf_ca_chain() and mbedtls_ssl_conf_ca_cb() - * cannot be used together. */ - conf->ca_chain = NULL; - conf->ca_crl = NULL; -} -#endif /* MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK */ -#endif /* MBEDTLS_X509_CRT_PARSE_C */ - -#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) -int mbedtls_ssl_set_hs_own_cert( mbedtls_ssl_context *ssl, - mbedtls_x509_crt *own_cert, - mbedtls_pk_context *pk_key ) -{ - return( ssl_append_key_cert( &ssl->handshake->sni_key_cert, - own_cert, pk_key ) ); -} - -void mbedtls_ssl_set_hs_ca_chain( mbedtls_ssl_context *ssl, - mbedtls_x509_crt *ca_chain, - mbedtls_x509_crl *ca_crl ) -{ - ssl->handshake->sni_ca_chain = ca_chain; - ssl->handshake->sni_ca_crl = ca_crl; -} - -void mbedtls_ssl_set_hs_authmode( mbedtls_ssl_context *ssl, - int authmode ) -{ - ssl->handshake->sni_authmode = authmode; -} -#endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */ - -#if defined(MBEDTLS_X509_CRT_PARSE_C) -void mbedtls_ssl_set_verify( mbedtls_ssl_context *ssl, - int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *), - void *p_vrfy ) -{ - ssl->f_vrfy = f_vrfy; - ssl->p_vrfy = p_vrfy; -} -#endif - -#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) -/* - * Set EC J-PAKE password for current handshake - */ -int mbedtls_ssl_set_hs_ecjpake_password( mbedtls_ssl_context *ssl, - const unsigned char *pw, - size_t pw_len ) -{ - mbedtls_ecjpake_role role; - - if( ssl->handshake == NULL || ssl->conf == NULL ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER ) - role = MBEDTLS_ECJPAKE_SERVER; - else - role = MBEDTLS_ECJPAKE_CLIENT; - - return( mbedtls_ecjpake_setup( &ssl->handshake->ecjpake_ctx, - role, - MBEDTLS_MD_SHA256, - MBEDTLS_ECP_DP_SECP256R1, - pw, pw_len ) ); -} -#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */ - -#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED) - -static void ssl_conf_remove_psk( mbedtls_ssl_config *conf ) -{ - /* Remove reference to existing PSK, if any. */ -#if defined(MBEDTLS_USE_PSA_CRYPTO) - if( conf->psk_opaque != 0 ) - { - /* The maintenance of the PSK key slot is the - * user's responsibility. */ - conf->psk_opaque = 0; - } - /* This and the following branch should never - * be taken simultaenously as we maintain the - * invariant that raw and opaque PSKs are never - * configured simultaneously. As a safeguard, - * though, `else` is omitted here. */ -#endif /* MBEDTLS_USE_PSA_CRYPTO */ - if( conf->psk != NULL ) - { - mbedtls_platform_zeroize( conf->psk, conf->psk_len ); - - mbedtls_free( conf->psk ); - conf->psk = NULL; - conf->psk_len = 0; - } - - /* Remove reference to PSK identity, if any. */ - if( conf->psk_identity != NULL ) - { - mbedtls_free( conf->psk_identity ); - conf->psk_identity = NULL; - conf->psk_identity_len = 0; - } -} - -/* This function assumes that PSK identity in the SSL config is unset. - * It checks that the provided identity is well-formed and attempts - * to make a copy of it in the SSL config. - * On failure, the PSK identity in the config remains unset. */ -static int ssl_conf_set_psk_identity( mbedtls_ssl_config *conf, - unsigned char const *psk_identity, - size_t psk_identity_len ) -{ - /* Identity len will be encoded on two bytes */ - if( psk_identity == NULL || - ( psk_identity_len >> 16 ) != 0 || - psk_identity_len > MBEDTLS_SSL_OUT_CONTENT_LEN ) - { - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - - conf->psk_identity = mbedtls_calloc( 1, psk_identity_len ); - if( conf->psk_identity == NULL ) - return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); - - conf->psk_identity_len = psk_identity_len; - memcpy( conf->psk_identity, psk_identity, conf->psk_identity_len ); - - return( 0 ); -} - -int mbedtls_ssl_conf_psk( mbedtls_ssl_config *conf, - const unsigned char *psk, size_t psk_len, - const unsigned char *psk_identity, size_t psk_identity_len ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - /* Remove opaque/raw PSK + PSK Identity */ - ssl_conf_remove_psk( conf ); - - /* Check and set raw PSK */ - if( psk == NULL ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - if( psk_len == 0 ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - if( psk_len > MBEDTLS_PSK_MAX_LEN ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - if( ( conf->psk = mbedtls_calloc( 1, psk_len ) ) == NULL ) - return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); - conf->psk_len = psk_len; - memcpy( conf->psk, psk, conf->psk_len ); - - /* Check and set PSK Identity */ - ret = ssl_conf_set_psk_identity( conf, psk_identity, psk_identity_len ); - if( ret != 0 ) - ssl_conf_remove_psk( conf ); - - return( ret ); -} - -static void ssl_remove_psk( mbedtls_ssl_context *ssl ) -{ -#if defined(MBEDTLS_USE_PSA_CRYPTO) - if( ssl->handshake->psk_opaque != 0 ) - { - ssl->handshake->psk_opaque = 0; - } - else -#endif /* MBEDTLS_USE_PSA_CRYPTO */ - if( ssl->handshake->psk != NULL ) - { - mbedtls_platform_zeroize( ssl->handshake->psk, - ssl->handshake->psk_len ); - mbedtls_free( ssl->handshake->psk ); - ssl->handshake->psk_len = 0; - } -} - -int mbedtls_ssl_set_hs_psk( mbedtls_ssl_context *ssl, - const unsigned char *psk, size_t psk_len ) -{ - if( psk == NULL || ssl->handshake == NULL ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - if( psk_len > MBEDTLS_PSK_MAX_LEN ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - ssl_remove_psk( ssl ); - - if( ( ssl->handshake->psk = mbedtls_calloc( 1, psk_len ) ) == NULL ) - return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); - - ssl->handshake->psk_len = psk_len; - memcpy( ssl->handshake->psk, psk, ssl->handshake->psk_len ); - - return( 0 ); -} - -#if defined(MBEDTLS_USE_PSA_CRYPTO) -int mbedtls_ssl_conf_psk_opaque( mbedtls_ssl_config *conf, - psa_key_handle_t psk_slot, - const unsigned char *psk_identity, - size_t psk_identity_len ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - /* Clear opaque/raw PSK + PSK Identity, if present. */ - ssl_conf_remove_psk( conf ); - - /* Check and set opaque PSK */ - if( psk_slot == 0 ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - conf->psk_opaque = psk_slot; - - /* Check and set PSK Identity */ - ret = ssl_conf_set_psk_identity( conf, psk_identity, - psk_identity_len ); - if( ret != 0 ) - ssl_conf_remove_psk( conf ); - - return( ret ); -} - -int mbedtls_ssl_set_hs_psk_opaque( mbedtls_ssl_context *ssl, - psa_key_handle_t psk_slot ) -{ - if( psk_slot == 0 || ssl->handshake == NULL ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - ssl_remove_psk( ssl ); - ssl->handshake->psk_opaque = psk_slot; - return( 0 ); -} -#endif /* MBEDTLS_USE_PSA_CRYPTO */ - -void mbedtls_ssl_conf_psk_cb( mbedtls_ssl_config *conf, - int (*f_psk)(void *, mbedtls_ssl_context *, const unsigned char *, - size_t), - void *p_psk ) -{ - conf->f_psk = f_psk; - conf->p_psk = p_psk; -} -#endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */ - -#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_SRV_C) - -#if !defined(MBEDTLS_DEPRECATED_REMOVED) -int mbedtls_ssl_conf_dh_param( mbedtls_ssl_config *conf, const char *dhm_P, const char *dhm_G ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - - if( ( ret = mbedtls_mpi_read_string( &conf->dhm_P, 16, dhm_P ) ) != 0 || - ( ret = mbedtls_mpi_read_string( &conf->dhm_G, 16, dhm_G ) ) != 0 ) - { - mbedtls_mpi_free( &conf->dhm_P ); - mbedtls_mpi_free( &conf->dhm_G ); - return( ret ); - } - - return( 0 ); -} -#endif /* MBEDTLS_DEPRECATED_REMOVED */ - -int mbedtls_ssl_conf_dh_param_bin( mbedtls_ssl_config *conf, - const unsigned char *dhm_P, size_t P_len, - const unsigned char *dhm_G, size_t G_len ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - - if( ( ret = mbedtls_mpi_read_binary( &conf->dhm_P, dhm_P, P_len ) ) != 0 || - ( ret = mbedtls_mpi_read_binary( &conf->dhm_G, dhm_G, G_len ) ) != 0 ) - { - mbedtls_mpi_free( &conf->dhm_P ); - mbedtls_mpi_free( &conf->dhm_G ); - return( ret ); - } - - return( 0 ); -} - -int mbedtls_ssl_conf_dh_param_ctx( mbedtls_ssl_config *conf, mbedtls_dhm_context *dhm_ctx ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - - if( ( ret = mbedtls_mpi_copy( &conf->dhm_P, &dhm_ctx->P ) ) != 0 || - ( ret = mbedtls_mpi_copy( &conf->dhm_G, &dhm_ctx->G ) ) != 0 ) - { - mbedtls_mpi_free( &conf->dhm_P ); - mbedtls_mpi_free( &conf->dhm_G ); - return( ret ); - } - - return( 0 ); -} -#endif /* MBEDTLS_DHM_C && MBEDTLS_SSL_SRV_C */ - -#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_CLI_C) -/* - * Set the minimum length for Diffie-Hellman parameters - */ -void mbedtls_ssl_conf_dhm_min_bitlen( mbedtls_ssl_config *conf, - unsigned int bitlen ) -{ - conf->dhm_min_bitlen = bitlen; -} -#endif /* MBEDTLS_DHM_C && MBEDTLS_SSL_CLI_C */ - -#if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) -/* - * Set allowed/preferred hashes for handshake signatures - */ -void mbedtls_ssl_conf_sig_hashes( mbedtls_ssl_config *conf, - const int *hashes ) -{ - conf->sig_hashes = hashes; -} -#endif /* MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */ - -#if defined(MBEDTLS_ECP_C) -/* - * Set the allowed elliptic curves - */ -void mbedtls_ssl_conf_curves( mbedtls_ssl_config *conf, - const mbedtls_ecp_group_id *curve_list ) -{ - conf->curve_list = curve_list; -} -#endif /* MBEDTLS_ECP_C */ - -#if defined(MBEDTLS_X509_CRT_PARSE_C) -int mbedtls_ssl_set_hostname( mbedtls_ssl_context *ssl, const char *hostname ) -{ - /* Initialize to suppress unnecessary compiler warning */ - size_t hostname_len = 0; - - /* Check if new hostname is valid before - * making any change to current one */ - if( hostname != NULL ) - { - hostname_len = strlen( hostname ); - - if( hostname_len > MBEDTLS_SSL_MAX_HOST_NAME_LEN ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - - /* Now it's clear that we will overwrite the old hostname, - * so we can free it safely */ - - if( ssl->hostname != NULL ) - { - mbedtls_platform_zeroize( ssl->hostname, strlen( ssl->hostname ) ); - mbedtls_free( ssl->hostname ); - } - - /* Passing NULL as hostname shall clear the old one */ - - if( hostname == NULL ) - { - ssl->hostname = NULL; - } - else - { - ssl->hostname = mbedtls_calloc( 1, hostname_len + 1 ); - if( ssl->hostname == NULL ) - return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); - - memcpy( ssl->hostname, hostname, hostname_len ); - - ssl->hostname[hostname_len] = '\0'; - } - - return( 0 ); -} -#endif /* MBEDTLS_X509_CRT_PARSE_C */ - -#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) -void mbedtls_ssl_conf_sni( mbedtls_ssl_config *conf, - int (*f_sni)(void *, mbedtls_ssl_context *, - const unsigned char *, size_t), - void *p_sni ) -{ - conf->f_sni = f_sni; - conf->p_sni = p_sni; -} -#endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */ - -#if defined(MBEDTLS_SSL_ALPN) -int mbedtls_ssl_conf_alpn_protocols( mbedtls_ssl_config *conf, const char **protos ) -{ - size_t cur_len, tot_len; - const char **p; - - /* - * RFC 7301 3.1: "Empty strings MUST NOT be included and byte strings - * MUST NOT be truncated." - * We check lengths now rather than later. - */ - tot_len = 0; - for( p = protos; *p != NULL; p++ ) - { - cur_len = strlen( *p ); - tot_len += cur_len; - - if( cur_len == 0 || cur_len > 255 || tot_len > 65535 ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - - conf->alpn_list = protos; - - return( 0 ); -} - -const char *mbedtls_ssl_get_alpn_protocol( const mbedtls_ssl_context *ssl ) -{ - return( ssl->alpn_chosen ); -} -#endif /* MBEDTLS_SSL_ALPN */ - -void mbedtls_ssl_conf_max_version( mbedtls_ssl_config *conf, int major, int minor ) -{ - conf->max_major_ver = major; - conf->max_minor_ver = minor; -} - -void mbedtls_ssl_conf_min_version( mbedtls_ssl_config *conf, int major, int minor ) -{ - conf->min_major_ver = major; - conf->min_minor_ver = minor; -} - -#if defined(MBEDTLS_SSL_FALLBACK_SCSV) && defined(MBEDTLS_SSL_CLI_C) -void mbedtls_ssl_conf_fallback( mbedtls_ssl_config *conf, char fallback ) -{ - conf->fallback = fallback; -} -#endif - -#if defined(MBEDTLS_SSL_SRV_C) -void mbedtls_ssl_conf_cert_req_ca_list( mbedtls_ssl_config *conf, - char cert_req_ca_list ) -{ - conf->cert_req_ca_list = cert_req_ca_list; -} -#endif - -#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) -void mbedtls_ssl_conf_encrypt_then_mac( mbedtls_ssl_config *conf, char etm ) -{ - conf->encrypt_then_mac = etm; -} -#endif - -#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET) -void mbedtls_ssl_conf_extended_master_secret( mbedtls_ssl_config *conf, char ems ) -{ - conf->extended_ms = ems; -} -#endif - -#if defined(MBEDTLS_ARC4_C) -void mbedtls_ssl_conf_arc4_support( mbedtls_ssl_config *conf, char arc4 ) -{ - conf->arc4_disabled = arc4; -} -#endif - -#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) -int mbedtls_ssl_conf_max_frag_len( mbedtls_ssl_config *conf, unsigned char mfl_code ) -{ - if( mfl_code >= MBEDTLS_SSL_MAX_FRAG_LEN_INVALID || - ssl_mfl_code_to_length( mfl_code ) > MBEDTLS_TLS_EXT_ADV_CONTENT_LEN ) - { - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - - conf->mfl_code = mfl_code; - - return( 0 ); -} -#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */ - -#if defined(MBEDTLS_SSL_TRUNCATED_HMAC) -void mbedtls_ssl_conf_truncated_hmac( mbedtls_ssl_config *conf, int truncate ) -{ - conf->trunc_hmac = truncate; -} -#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */ - -#if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING) -void mbedtls_ssl_conf_cbc_record_splitting( mbedtls_ssl_config *conf, char split ) -{ - conf->cbc_record_splitting = split; -} -#endif - -void mbedtls_ssl_conf_legacy_renegotiation( mbedtls_ssl_config *conf, int allow_legacy ) -{ - conf->allow_legacy_renegotiation = allow_legacy; -} - -#if defined(MBEDTLS_SSL_RENEGOTIATION) -void mbedtls_ssl_conf_renegotiation( mbedtls_ssl_config *conf, int renegotiation ) -{ - conf->disable_renegotiation = renegotiation; -} - -void mbedtls_ssl_conf_renegotiation_enforced( mbedtls_ssl_config *conf, int max_records ) -{ - conf->renego_max_records = max_records; -} - -void mbedtls_ssl_conf_renegotiation_period( mbedtls_ssl_config *conf, - const unsigned char period[8] ) -{ - memcpy( conf->renego_period, period, 8 ); -} -#endif /* MBEDTLS_SSL_RENEGOTIATION */ - -#if defined(MBEDTLS_SSL_SESSION_TICKETS) -#if defined(MBEDTLS_SSL_CLI_C) -void mbedtls_ssl_conf_session_tickets( mbedtls_ssl_config *conf, int use_tickets ) -{ - conf->session_tickets = use_tickets; -} -#endif - -#if defined(MBEDTLS_SSL_SRV_C) -void mbedtls_ssl_conf_session_tickets_cb( mbedtls_ssl_config *conf, - mbedtls_ssl_ticket_write_t *f_ticket_write, - mbedtls_ssl_ticket_parse_t *f_ticket_parse, - void *p_ticket ) -{ - conf->f_ticket_write = f_ticket_write; - conf->f_ticket_parse = f_ticket_parse; - conf->p_ticket = p_ticket; -} -#endif -#endif /* MBEDTLS_SSL_SESSION_TICKETS */ - -#if defined(MBEDTLS_SSL_EXPORT_KEYS) -void mbedtls_ssl_conf_export_keys_cb( mbedtls_ssl_config *conf, - mbedtls_ssl_export_keys_t *f_export_keys, - void *p_export_keys ) -{ - conf->f_export_keys = f_export_keys; - conf->p_export_keys = p_export_keys; -} - -void mbedtls_ssl_conf_export_keys_ext_cb( mbedtls_ssl_config *conf, - mbedtls_ssl_export_keys_ext_t *f_export_keys_ext, - void *p_export_keys ) -{ - conf->f_export_keys_ext = f_export_keys_ext; - conf->p_export_keys = p_export_keys; -} -#endif - -#if defined(MBEDTLS_SSL_ASYNC_PRIVATE) -void mbedtls_ssl_conf_async_private_cb( - mbedtls_ssl_config *conf, - mbedtls_ssl_async_sign_t *f_async_sign, - mbedtls_ssl_async_decrypt_t *f_async_decrypt, - mbedtls_ssl_async_resume_t *f_async_resume, - mbedtls_ssl_async_cancel_t *f_async_cancel, - void *async_config_data ) -{ - conf->f_async_sign_start = f_async_sign; - conf->f_async_decrypt_start = f_async_decrypt; - conf->f_async_resume = f_async_resume; - conf->f_async_cancel = f_async_cancel; - conf->p_async_config_data = async_config_data; -} - -void *mbedtls_ssl_conf_get_async_config_data( const mbedtls_ssl_config *conf ) -{ - return( conf->p_async_config_data ); -} - -void *mbedtls_ssl_get_async_operation_data( const mbedtls_ssl_context *ssl ) -{ - if( ssl->handshake == NULL ) - return( NULL ); - else - return( ssl->handshake->user_async_ctx ); -} - -void mbedtls_ssl_set_async_operation_data( mbedtls_ssl_context *ssl, - void *ctx ) -{ - if( ssl->handshake != NULL ) - ssl->handshake->user_async_ctx = ctx; -} -#endif /* MBEDTLS_SSL_ASYNC_PRIVATE */ - /* * SSL get accessors */ @@ -9672,62 +4948,6 @@ int mbedtls_ssl_check_pending( const mbedtls_ssl_context *ssl ) return( 0 ); } -uint32_t mbedtls_ssl_get_verify_result( const mbedtls_ssl_context *ssl ) -{ - if( ssl->session != NULL ) - return( ssl->session->verify_result ); - - if( ssl->session_negotiate != NULL ) - return( ssl->session_negotiate->verify_result ); - - return( 0xFFFFFFFF ); -} - -const char *mbedtls_ssl_get_ciphersuite( const mbedtls_ssl_context *ssl ) -{ - if( ssl == NULL || ssl->session == NULL ) - return( NULL ); - - return mbedtls_ssl_get_ciphersuite_name( ssl->session->ciphersuite ); -} - -const char *mbedtls_ssl_get_version( const mbedtls_ssl_context *ssl ) -{ -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - { - switch( ssl->minor_ver ) - { - case MBEDTLS_SSL_MINOR_VERSION_2: - return( "DTLSv1.0" ); - - case MBEDTLS_SSL_MINOR_VERSION_3: - return( "DTLSv1.2" ); - - default: - return( "unknown (DTLS)" ); - } - } -#endif - - switch( ssl->minor_ver ) - { - case MBEDTLS_SSL_MINOR_VERSION_0: - return( "SSLv3.0" ); - - case MBEDTLS_SSL_MINOR_VERSION_1: - return( "TLSv1.0" ); - - case MBEDTLS_SSL_MINOR_VERSION_2: - return( "TLSv1.1" ); - - case MBEDTLS_SSL_MINOR_VERSION_3: - return( "TLSv1.2" ); - - default: - return( "unknown" ); - } -} int mbedtls_ssl_get_record_expansion( const mbedtls_ssl_context *ssl ) { @@ -9789,872 +5009,7 @@ int mbedtls_ssl_get_record_expansion( const mbedtls_ssl_context *ssl ) return( (int)( out_hdr_len + transform_expansion ) ); } -#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) -size_t mbedtls_ssl_get_max_frag_len( const mbedtls_ssl_context *ssl ) -{ - size_t max_len; - - /* - * Assume mfl_code is correct since it was checked when set - */ - max_len = ssl_mfl_code_to_length( ssl->conf->mfl_code ); - - /* Check if a smaller max length was negotiated */ - if( ssl->session_out != NULL && - ssl_mfl_code_to_length( ssl->session_out->mfl_code ) < max_len ) - { - max_len = ssl_mfl_code_to_length( ssl->session_out->mfl_code ); - } - - /* During a handshake, use the value being negotiated */ - if( ssl->session_negotiate != NULL && - ssl_mfl_code_to_length( ssl->session_negotiate->mfl_code ) < max_len ) - { - max_len = ssl_mfl_code_to_length( ssl->session_negotiate->mfl_code ); - } - - return( max_len ); -} -#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */ - -#if defined(MBEDTLS_SSL_PROTO_DTLS) -size_t mbedtls_ssl_get_current_mtu( const mbedtls_ssl_context *ssl ) -{ - /* Return unlimited mtu for client hello messages to avoid fragmentation. */ - if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT && - ( ssl->state == MBEDTLS_SSL_CLIENT_HELLO || - ssl->state == MBEDTLS_SSL_SERVER_HELLO ) ) - return ( 0 ); - - if( ssl->handshake == NULL || ssl->handshake->mtu == 0 ) - return( ssl->mtu ); - - if( ssl->mtu == 0 ) - return( ssl->handshake->mtu ); - - return( ssl->mtu < ssl->handshake->mtu ? - ssl->mtu : ssl->handshake->mtu ); -} -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - -int mbedtls_ssl_get_max_out_record_payload( const mbedtls_ssl_context *ssl ) -{ - size_t max_len = MBEDTLS_SSL_OUT_CONTENT_LEN; - -#if !defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) && \ - !defined(MBEDTLS_SSL_PROTO_DTLS) - (void) ssl; -#endif - -#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) - const size_t mfl = mbedtls_ssl_get_max_frag_len( ssl ); - - if( max_len > mfl ) - max_len = mfl; -#endif - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( mbedtls_ssl_get_current_mtu( ssl ) != 0 ) - { - const size_t mtu = mbedtls_ssl_get_current_mtu( ssl ); - const int ret = mbedtls_ssl_get_record_expansion( ssl ); - const size_t overhead = (size_t) ret; - - if( ret < 0 ) - return( ret ); - - if( mtu <= overhead ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "MTU too low for record expansion" ) ); - return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE ); - } - - if( max_len > mtu - overhead ) - max_len = mtu - overhead; - } -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - -#if !defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) && \ - !defined(MBEDTLS_SSL_PROTO_DTLS) - ((void) ssl); -#endif - - return( (int) max_len ); -} - -#if defined(MBEDTLS_X509_CRT_PARSE_C) -const mbedtls_x509_crt *mbedtls_ssl_get_peer_cert( const mbedtls_ssl_context *ssl ) -{ - if( ssl == NULL || ssl->session == NULL ) - return( NULL ); - -#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) - return( ssl->session->peer_cert ); -#else - return( NULL ); -#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ -} -#endif /* MBEDTLS_X509_CRT_PARSE_C */ - -#if defined(MBEDTLS_SSL_CLI_C) -int mbedtls_ssl_get_session( const mbedtls_ssl_context *ssl, - mbedtls_ssl_session *dst ) -{ - if( ssl == NULL || - dst == NULL || - ssl->session == NULL || - ssl->conf->endpoint != MBEDTLS_SSL_IS_CLIENT ) - { - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - - return( mbedtls_ssl_session_copy( dst, ssl->session ) ); -} -#endif /* MBEDTLS_SSL_CLI_C */ - -const mbedtls_ssl_session *mbedtls_ssl_get_session_pointer( const mbedtls_ssl_context *ssl ) -{ - if( ssl == NULL ) - return( NULL ); - - return( ssl->session ); -} - -/* - * Define ticket header determining Mbed TLS version - * and structure of the ticket. - */ - -/* - * Define bitflag determining compile-time settings influencing - * structure of serialized SSL sessions. - */ - -#if defined(MBEDTLS_HAVE_TIME) -#define SSL_SERIALIZED_SESSION_CONFIG_TIME 1 -#else -#define SSL_SERIALIZED_SESSION_CONFIG_TIME 0 -#endif /* MBEDTLS_HAVE_TIME */ - -#if defined(MBEDTLS_X509_CRT_PARSE_C) -#define SSL_SERIALIZED_SESSION_CONFIG_CRT 1 -#else -#define SSL_SERIALIZED_SESSION_CONFIG_CRT 0 -#endif /* MBEDTLS_X509_CRT_PARSE_C */ - -#if defined(MBEDTLS_SSL_CLI_C) && defined(MBEDTLS_SSL_SESSION_TICKETS) -#define SSL_SERIALIZED_SESSION_CONFIG_CLIENT_TICKET 1 -#else -#define SSL_SERIALIZED_SESSION_CONFIG_CLIENT_TICKET 0 -#endif /* MBEDTLS_SSL_CLI_C && MBEDTLS_SSL_SESSION_TICKETS */ - -#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) -#define SSL_SERIALIZED_SESSION_CONFIG_MFL 1 -#else -#define SSL_SERIALIZED_SESSION_CONFIG_MFL 0 -#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */ - -#if defined(MBEDTLS_SSL_TRUNCATED_HMAC) -#define SSL_SERIALIZED_SESSION_CONFIG_TRUNC_HMAC 1 -#else -#define SSL_SERIALIZED_SESSION_CONFIG_TRUNC_HMAC 0 -#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */ - -#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) -#define SSL_SERIALIZED_SESSION_CONFIG_ETM 1 -#else -#define SSL_SERIALIZED_SESSION_CONFIG_ETM 0 -#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */ - -#if defined(MBEDTLS_SSL_SESSION_TICKETS) -#define SSL_SERIALIZED_SESSION_CONFIG_TICKET 1 -#else -#define SSL_SERIALIZED_SESSION_CONFIG_TICKET 0 -#endif /* MBEDTLS_SSL_SESSION_TICKETS */ - -#define SSL_SERIALIZED_SESSION_CONFIG_TIME_BIT 0 -#define SSL_SERIALIZED_SESSION_CONFIG_CRT_BIT 1 -#define SSL_SERIALIZED_SESSION_CONFIG_CLIENT_TICKET_BIT 2 -#define SSL_SERIALIZED_SESSION_CONFIG_MFL_BIT 3 -#define SSL_SERIALIZED_SESSION_CONFIG_TRUNC_HMAC_BIT 4 -#define SSL_SERIALIZED_SESSION_CONFIG_ETM_BIT 5 -#define SSL_SERIALIZED_SESSION_CONFIG_TICKET_BIT 6 - -#define SSL_SERIALIZED_SESSION_CONFIG_BITFLAG \ - ( (uint16_t) ( \ - ( SSL_SERIALIZED_SESSION_CONFIG_TIME << SSL_SERIALIZED_SESSION_CONFIG_TIME_BIT ) | \ - ( SSL_SERIALIZED_SESSION_CONFIG_CRT << SSL_SERIALIZED_SESSION_CONFIG_CRT_BIT ) | \ - ( SSL_SERIALIZED_SESSION_CONFIG_CLIENT_TICKET << SSL_SERIALIZED_SESSION_CONFIG_CLIENT_TICKET_BIT ) | \ - ( SSL_SERIALIZED_SESSION_CONFIG_MFL << SSL_SERIALIZED_SESSION_CONFIG_MFL_BIT ) | \ - ( SSL_SERIALIZED_SESSION_CONFIG_TRUNC_HMAC << SSL_SERIALIZED_SESSION_CONFIG_TRUNC_HMAC_BIT ) | \ - ( SSL_SERIALIZED_SESSION_CONFIG_ETM << SSL_SERIALIZED_SESSION_CONFIG_ETM_BIT ) | \ - ( SSL_SERIALIZED_SESSION_CONFIG_TICKET << SSL_SERIALIZED_SESSION_CONFIG_TICKET_BIT ) ) ) - -static unsigned char ssl_serialized_session_header[] = { - MBEDTLS_VERSION_MAJOR, - MBEDTLS_VERSION_MINOR, - MBEDTLS_VERSION_PATCH, - ( SSL_SERIALIZED_SESSION_CONFIG_BITFLAG >> 8 ) & 0xFF, - ( SSL_SERIALIZED_SESSION_CONFIG_BITFLAG >> 0 ) & 0xFF, -}; - -/* - * Serialize a session in the following format: - * (in the presentation language of TLS, RFC 8446 section 3) - * - * opaque mbedtls_version[3]; // major, minor, patch - * opaque session_format[2]; // version-specific 16-bit field determining - * // the format of the remaining - * // serialized data. - * - * Note: When updating the format, remember to keep - * these version+format bytes. - * - * // In this version, `session_format` determines - * // the setting of those compile-time - * // configuration options which influence - * // the structure of mbedtls_ssl_session. - * uint64 start_time; - * uint8 ciphersuite[2]; // defined by the standard - * uint8 compression; // 0 or 1 - * uint8 session_id_len; // at most 32 - * opaque session_id[32]; - * opaque master[48]; // fixed length in the standard - * uint32 verify_result; - * opaque peer_cert<0..2^24-1>; // length 0 means no peer cert - * opaque ticket<0..2^24-1>; // length 0 means no ticket - * uint32 ticket_lifetime; - * uint8 mfl_code; // up to 255 according to standard - * uint8 trunc_hmac; // 0 or 1 - * uint8 encrypt_then_mac; // 0 or 1 - * - * The order is the same as in the definition of the structure, except - * verify_result is put before peer_cert so that all mandatory fields come - * together in one block. - */ -static int ssl_session_save( const mbedtls_ssl_session *session, - unsigned char omit_header, - unsigned char *buf, - size_t buf_len, - size_t *olen ) -{ - unsigned char *p = buf; - size_t used = 0; -#if defined(MBEDTLS_HAVE_TIME) - uint64_t start; -#endif -#if defined(MBEDTLS_X509_CRT_PARSE_C) -#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) - size_t cert_len; -#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ -#endif /* MBEDTLS_X509_CRT_PARSE_C */ - - - if( !omit_header ) - { - /* - * Add version identifier - */ - - used += sizeof( ssl_serialized_session_header ); - - if( used <= buf_len ) - { - memcpy( p, ssl_serialized_session_header, - sizeof( ssl_serialized_session_header ) ); - p += sizeof( ssl_serialized_session_header ); - } - } - - /* - * Time - */ -#if defined(MBEDTLS_HAVE_TIME) - used += 8; - - if( used <= buf_len ) - { - start = (uint64_t) session->start; - - *p++ = (unsigned char)( ( start >> 56 ) & 0xFF ); - *p++ = (unsigned char)( ( start >> 48 ) & 0xFF ); - *p++ = (unsigned char)( ( start >> 40 ) & 0xFF ); - *p++ = (unsigned char)( ( start >> 32 ) & 0xFF ); - *p++ = (unsigned char)( ( start >> 24 ) & 0xFF ); - *p++ = (unsigned char)( ( start >> 16 ) & 0xFF ); - *p++ = (unsigned char)( ( start >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( start ) & 0xFF ); - } -#endif /* MBEDTLS_HAVE_TIME */ - - /* - * Basic mandatory fields - */ - used += 2 /* ciphersuite */ - + 1 /* compression */ - + 1 /* id_len */ - + sizeof( session->id ) - + sizeof( session->master ) - + 4; /* verify_result */ - - if( used <= buf_len ) - { - *p++ = (unsigned char)( ( session->ciphersuite >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( session->ciphersuite ) & 0xFF ); - - *p++ = (unsigned char)( session->compression & 0xFF ); - - *p++ = (unsigned char)( session->id_len & 0xFF ); - memcpy( p, session->id, 32 ); - p += 32; - - memcpy( p, session->master, 48 ); - p += 48; - - *p++ = (unsigned char)( ( session->verify_result >> 24 ) & 0xFF ); - *p++ = (unsigned char)( ( session->verify_result >> 16 ) & 0xFF ); - *p++ = (unsigned char)( ( session->verify_result >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( session->verify_result ) & 0xFF ); - } - - /* - * Peer's end-entity certificate - */ -#if defined(MBEDTLS_X509_CRT_PARSE_C) -#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) - if( session->peer_cert == NULL ) - cert_len = 0; - else - cert_len = session->peer_cert->raw.len; - - used += 3 + cert_len; - - if( used <= buf_len ) - { - *p++ = (unsigned char)( ( cert_len >> 16 ) & 0xFF ); - *p++ = (unsigned char)( ( cert_len >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( cert_len ) & 0xFF ); - - if( session->peer_cert != NULL ) - { - memcpy( p, session->peer_cert->raw.p, cert_len ); - p += cert_len; - } - } -#else /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ - if( session->peer_cert_digest != NULL ) - { - used += 1 /* type */ + 1 /* length */ + session->peer_cert_digest_len; - if( used <= buf_len ) - { - *p++ = (unsigned char) session->peer_cert_digest_type; - *p++ = (unsigned char) session->peer_cert_digest_len; - memcpy( p, session->peer_cert_digest, - session->peer_cert_digest_len ); - p += session->peer_cert_digest_len; - } - } - else - { - used += 2; - if( used <= buf_len ) - { - *p++ = (unsigned char) MBEDTLS_MD_NONE; - *p++ = 0; - } - } -#endif /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ -#endif /* MBEDTLS_X509_CRT_PARSE_C */ - - /* - * Session ticket if any, plus associated data - */ -#if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C) - used += 3 + session->ticket_len + 4; /* len + ticket + lifetime */ - - if( used <= buf_len ) - { - *p++ = (unsigned char)( ( session->ticket_len >> 16 ) & 0xFF ); - *p++ = (unsigned char)( ( session->ticket_len >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( session->ticket_len ) & 0xFF ); - - if( session->ticket != NULL ) - { - memcpy( p, session->ticket, session->ticket_len ); - p += session->ticket_len; - } - - *p++ = (unsigned char)( ( session->ticket_lifetime >> 24 ) & 0xFF ); - *p++ = (unsigned char)( ( session->ticket_lifetime >> 16 ) & 0xFF ); - *p++ = (unsigned char)( ( session->ticket_lifetime >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( session->ticket_lifetime ) & 0xFF ); - } -#endif /* MBEDTLS_SSL_SESSION_TICKETS && MBEDTLS_SSL_CLI_C */ - - /* - * Misc extension-related info - */ -#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) - used += 1; - - if( used <= buf_len ) - *p++ = session->mfl_code; -#endif - -#if defined(MBEDTLS_SSL_TRUNCATED_HMAC) - used += 1; - - if( used <= buf_len ) - *p++ = (unsigned char)( ( session->trunc_hmac ) & 0xFF ); -#endif - -#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) - used += 1; - - if( used <= buf_len ) - *p++ = (unsigned char)( ( session->encrypt_then_mac ) & 0xFF ); -#endif - - /* Done */ - *olen = used; - - if( used > buf_len ) - return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL ); - - return( 0 ); -} - -/* - * Public wrapper for ssl_session_save() - */ -int mbedtls_ssl_session_save( const mbedtls_ssl_session *session, - unsigned char *buf, - size_t buf_len, - size_t *olen ) -{ - return( ssl_session_save( session, 0, buf, buf_len, olen ) ); -} - -/* - * Deserialize session, see mbedtls_ssl_session_save() for format. - * - * This internal version is wrapped by a public function that cleans up in - * case of error, and has an extra option omit_header. - */ -static int ssl_session_load( mbedtls_ssl_session *session, - unsigned char omit_header, - const unsigned char *buf, - size_t len ) -{ - const unsigned char *p = buf; - const unsigned char * const end = buf + len; -#if defined(MBEDTLS_HAVE_TIME) - uint64_t start; -#endif -#if defined(MBEDTLS_X509_CRT_PARSE_C) -#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) - size_t cert_len; -#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ -#endif /* MBEDTLS_X509_CRT_PARSE_C */ - - if( !omit_header ) - { - /* - * Check version identifier - */ - - if( (size_t)( end - p ) < sizeof( ssl_serialized_session_header ) ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - if( memcmp( p, ssl_serialized_session_header, - sizeof( ssl_serialized_session_header ) ) != 0 ) - { - return( MBEDTLS_ERR_SSL_VERSION_MISMATCH ); - } - p += sizeof( ssl_serialized_session_header ); - } - - /* - * Time - */ -#if defined(MBEDTLS_HAVE_TIME) - if( 8 > (size_t)( end - p ) ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - start = ( (uint64_t) p[0] << 56 ) | - ( (uint64_t) p[1] << 48 ) | - ( (uint64_t) p[2] << 40 ) | - ( (uint64_t) p[3] << 32 ) | - ( (uint64_t) p[4] << 24 ) | - ( (uint64_t) p[5] << 16 ) | - ( (uint64_t) p[6] << 8 ) | - ( (uint64_t) p[7] ); - p += 8; - - session->start = (time_t) start; -#endif /* MBEDTLS_HAVE_TIME */ - - /* - * Basic mandatory fields - */ - if( 2 + 1 + 1 + 32 + 48 + 4 > (size_t)( end - p ) ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - session->ciphersuite = ( p[0] << 8 ) | p[1]; - p += 2; - - session->compression = *p++; - - session->id_len = *p++; - memcpy( session->id, p, 32 ); - p += 32; - - memcpy( session->master, p, 48 ); - p += 48; - - session->verify_result = ( (uint32_t) p[0] << 24 ) | - ( (uint32_t) p[1] << 16 ) | - ( (uint32_t) p[2] << 8 ) | - ( (uint32_t) p[3] ); - p += 4; - - /* Immediately clear invalid pointer values that have been read, in case - * we exit early before we replaced them with valid ones. */ -#if defined(MBEDTLS_X509_CRT_PARSE_C) -#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) - session->peer_cert = NULL; -#else - session->peer_cert_digest = NULL; -#endif /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ -#endif /* MBEDTLS_X509_CRT_PARSE_C */ -#if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C) - session->ticket = NULL; -#endif /* MBEDTLS_SSL_SESSION_TICKETS && MBEDTLS_SSL_CLI_C */ - - /* - * Peer certificate - */ -#if defined(MBEDTLS_X509_CRT_PARSE_C) -#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) - /* Deserialize CRT from the end of the ticket. */ - if( 3 > (size_t)( end - p ) ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - cert_len = ( p[0] << 16 ) | ( p[1] << 8 ) | p[2]; - p += 3; - - if( cert_len != 0 ) - { - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - - if( cert_len > (size_t)( end - p ) ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - session->peer_cert = mbedtls_calloc( 1, sizeof( mbedtls_x509_crt ) ); - - if( session->peer_cert == NULL ) - return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); - - mbedtls_x509_crt_init( session->peer_cert ); - - if( ( ret = mbedtls_x509_crt_parse_der( session->peer_cert, - p, cert_len ) ) != 0 ) - { - mbedtls_x509_crt_free( session->peer_cert ); - mbedtls_free( session->peer_cert ); - session->peer_cert = NULL; - return( ret ); - } - - p += cert_len; - } -#else /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ - /* Deserialize CRT digest from the end of the ticket. */ - if( 2 > (size_t)( end - p ) ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - session->peer_cert_digest_type = (mbedtls_md_type_t) *p++; - session->peer_cert_digest_len = (size_t) *p++; - - if( session->peer_cert_digest_len != 0 ) - { - const mbedtls_md_info_t *md_info = - mbedtls_md_info_from_type( session->peer_cert_digest_type ); - if( md_info == NULL ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - if( session->peer_cert_digest_len != mbedtls_md_get_size( md_info ) ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - if( session->peer_cert_digest_len > (size_t)( end - p ) ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - session->peer_cert_digest = - mbedtls_calloc( 1, session->peer_cert_digest_len ); - if( session->peer_cert_digest == NULL ) - return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); - - memcpy( session->peer_cert_digest, p, - session->peer_cert_digest_len ); - p += session->peer_cert_digest_len; - } -#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ -#endif /* MBEDTLS_X509_CRT_PARSE_C */ - - /* - * Session ticket and associated data - */ -#if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C) - if( 3 > (size_t)( end - p ) ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - session->ticket_len = ( p[0] << 16 ) | ( p[1] << 8 ) | p[2]; - p += 3; - - if( session->ticket_len != 0 ) - { - if( session->ticket_len > (size_t)( end - p ) ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - session->ticket = mbedtls_calloc( 1, session->ticket_len ); - if( session->ticket == NULL ) - return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); - - memcpy( session->ticket, p, session->ticket_len ); - p += session->ticket_len; - } - - if( 4 > (size_t)( end - p ) ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - session->ticket_lifetime = ( (uint32_t) p[0] << 24 ) | - ( (uint32_t) p[1] << 16 ) | - ( (uint32_t) p[2] << 8 ) | - ( (uint32_t) p[3] ); - p += 4; -#endif /* MBEDTLS_SSL_SESSION_TICKETS && MBEDTLS_SSL_CLI_C */ - - /* - * Misc extension-related info - */ -#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) - if( 1 > (size_t)( end - p ) ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - session->mfl_code = *p++; -#endif - -#if defined(MBEDTLS_SSL_TRUNCATED_HMAC) - if( 1 > (size_t)( end - p ) ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - session->trunc_hmac = *p++; -#endif - -#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) - if( 1 > (size_t)( end - p ) ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - session->encrypt_then_mac = *p++; -#endif - - /* Done, should have consumed entire buffer */ - if( p != end ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - return( 0 ); -} - -/* - * Deserialize session: public wrapper for error cleaning - */ -int mbedtls_ssl_session_load( mbedtls_ssl_session *session, - const unsigned char *buf, - size_t len ) -{ - int ret = ssl_session_load( session, 0, buf, len ); - - if( ret != 0 ) - mbedtls_ssl_session_free( session ); - - return( ret ); -} - -/* - * Perform a single step of the SSL handshake - */ -int mbedtls_ssl_handshake_step( mbedtls_ssl_context *ssl ) -{ - int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; - - if( ssl == NULL || ssl->conf == NULL ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - -#if defined(MBEDTLS_SSL_CLI_C) - if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT ) - ret = mbedtls_ssl_handshake_client_step( ssl ); -#endif -#if defined(MBEDTLS_SSL_SRV_C) - if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER ) - ret = mbedtls_ssl_handshake_server_step( ssl ); -#endif - - return( ret ); -} - -/* - * Perform the SSL handshake - */ -int mbedtls_ssl_handshake( mbedtls_ssl_context *ssl ) -{ - int ret = 0; - - if( ssl == NULL || ssl->conf == NULL ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> handshake" ) ); - - while( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER ) - { - ret = mbedtls_ssl_handshake_step( ssl ); - - if( ret != 0 ) - break; - } - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= handshake" ) ); - - return( ret ); -} - #if defined(MBEDTLS_SSL_RENEGOTIATION) -#if defined(MBEDTLS_SSL_SRV_C) -/* - * Write HelloRequest to request renegotiation on server - */ -static int ssl_write_hello_request( mbedtls_ssl_context *ssl ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write hello request" ) ); - - ssl->out_msglen = 4; - ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE; - ssl->out_msg[0] = MBEDTLS_SSL_HS_HELLO_REQUEST; - - if( ( ret = mbedtls_ssl_write_handshake_msg( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_handshake_msg", ret ); - return( ret ); - } - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write hello request" ) ); - - return( 0 ); -} -#endif /* MBEDTLS_SSL_SRV_C */ - -/* - * Actually renegotiate current connection, triggered by either: - * - any side: calling mbedtls_ssl_renegotiate(), - * - client: receiving a HelloRequest during mbedtls_ssl_read(), - * - server: receiving any handshake message on server during mbedtls_ssl_read() after - * the initial handshake is completed. - * If the handshake doesn't complete due to waiting for I/O, it will continue - * during the next calls to mbedtls_ssl_renegotiate() or mbedtls_ssl_read() respectively. - */ -int mbedtls_ssl_start_renegotiation( mbedtls_ssl_context *ssl ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> renegotiate" ) ); - - if( ( ret = ssl_handshake_init( ssl ) ) != 0 ) - return( ret ); - - /* RFC 6347 4.2.2: "[...] the HelloRequest will have message_seq = 0 and - * the ServerHello will have message_seq = 1" */ -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && - ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_PENDING ) - { - if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER ) - ssl->handshake->out_msg_seq = 1; - else - ssl->handshake->in_msg_seq = 1; - } -#endif - - ssl->state = MBEDTLS_SSL_HELLO_REQUEST; - ssl->renego_status = MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS; - - if( ( ret = mbedtls_ssl_handshake( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_handshake", ret ); - return( ret ); - } - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= renegotiate" ) ); - - return( 0 ); -} - -/* - * Renegotiate current connection on client, - * or request renegotiation on server - */ -int mbedtls_ssl_renegotiate( mbedtls_ssl_context *ssl ) -{ - int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; - - if( ssl == NULL || ssl->conf == NULL ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - -#if defined(MBEDTLS_SSL_SRV_C) - /* On server, just send the request */ - if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER ) - { - if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - ssl->renego_status = MBEDTLS_SSL_RENEGOTIATION_PENDING; - - /* Did we already try/start sending HelloRequest? */ - if( ssl->out_left != 0 ) - return( mbedtls_ssl_flush_output( ssl ) ); - - return( ssl_write_hello_request( ssl ) ); - } -#endif /* MBEDTLS_SSL_SRV_C */ - -#if defined(MBEDTLS_SSL_CLI_C) - /* - * On client, either start the renegotiation process or, - * if already in progress, continue the handshake - */ - if( ssl->renego_status != MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS ) - { - if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - if( ( ret = mbedtls_ssl_start_renegotiation( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_start_renegotiation", ret ); - return( ret ); - } - } - else - { - if( ( ret = mbedtls_ssl_handshake( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_handshake", ret ); - return( ret ); - } - } -#endif /* MBEDTLS_SSL_CLI_C */ - - return( ret ); -} - /* * Check record counters and renegotiate if they're above the limit. */ @@ -11196,20 +5551,6 @@ void mbedtls_ssl_transform_free( mbedtls_ssl_transform *transform ) mbedtls_platform_zeroize( transform, sizeof( mbedtls_ssl_transform ) ); } -#if defined(MBEDTLS_X509_CRT_PARSE_C) -static void ssl_key_cert_free( mbedtls_ssl_key_cert *key_cert ) -{ - mbedtls_ssl_key_cert *cur = key_cert, *next; - - while( cur != NULL ) - { - next = cur->next; - mbedtls_free( cur ); - cur = next; - } -} -#endif /* MBEDTLS_X509_CRT_PARSE_C */ - #if defined(MBEDTLS_SSL_PROTO_DTLS) void mbedtls_ssl_buffering_free( mbedtls_ssl_context *ssl ) @@ -11246,1402 +5587,6 @@ static void ssl_buffering_free_slot( mbedtls_ssl_context *ssl, #endif /* MBEDTLS_SSL_PROTO_DTLS */ -void mbedtls_ssl_handshake_free( mbedtls_ssl_context *ssl ) -{ - mbedtls_ssl_handshake_params *handshake = ssl->handshake; - - if( handshake == NULL ) - return; - -#if defined(MBEDTLS_SSL_ASYNC_PRIVATE) - if( ssl->conf->f_async_cancel != NULL && handshake->async_in_progress != 0 ) - { - ssl->conf->f_async_cancel( ssl ); - handshake->async_in_progress = 0; - } -#endif /* MBEDTLS_SSL_ASYNC_PRIVATE */ - -#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \ - defined(MBEDTLS_SSL_PROTO_TLS1_1) - mbedtls_md5_free( &handshake->fin_md5 ); - mbedtls_sha1_free( &handshake->fin_sha1 ); -#endif -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) -#if defined(MBEDTLS_SHA256_C) -#if defined(MBEDTLS_USE_PSA_CRYPTO) - psa_hash_abort( &handshake->fin_sha256_psa ); -#else - mbedtls_sha256_free( &handshake->fin_sha256 ); -#endif -#endif -#if defined(MBEDTLS_SHA512_C) -#if defined(MBEDTLS_USE_PSA_CRYPTO) - psa_hash_abort( &handshake->fin_sha384_psa ); -#else - mbedtls_sha512_free( &handshake->fin_sha512 ); -#endif -#endif -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ - -#if defined(MBEDTLS_DHM_C) - mbedtls_dhm_free( &handshake->dhm_ctx ); -#endif -#if defined(MBEDTLS_ECDH_C) - mbedtls_ecdh_free( &handshake->ecdh_ctx ); -#endif -#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) - mbedtls_ecjpake_free( &handshake->ecjpake_ctx ); -#if defined(MBEDTLS_SSL_CLI_C) - mbedtls_free( handshake->ecjpake_cache ); - handshake->ecjpake_cache = NULL; - handshake->ecjpake_cache_len = 0; -#endif -#endif - -#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) - /* explicit void pointer cast for buggy MS compiler */ - mbedtls_free( (void *) handshake->curves ); -#endif - -#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED) - if( handshake->psk != NULL ) - { - mbedtls_platform_zeroize( handshake->psk, handshake->psk_len ); - mbedtls_free( handshake->psk ); - } -#endif - -#if defined(MBEDTLS_X509_CRT_PARSE_C) && \ - defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) - /* - * Free only the linked list wrapper, not the keys themselves - * since the belong to the SNI callback - */ - if( handshake->sni_key_cert != NULL ) - { - mbedtls_ssl_key_cert *cur = handshake->sni_key_cert, *next; - - while( cur != NULL ) - { - next = cur->next; - mbedtls_free( cur ); - cur = next; - } - } -#endif /* MBEDTLS_X509_CRT_PARSE_C && MBEDTLS_SSL_SERVER_NAME_INDICATION */ - -#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) - mbedtls_x509_crt_restart_free( &handshake->ecrs_ctx ); - if( handshake->ecrs_peer_cert != NULL ) - { - mbedtls_x509_crt_free( handshake->ecrs_peer_cert ); - mbedtls_free( handshake->ecrs_peer_cert ); - } -#endif - -#if defined(MBEDTLS_X509_CRT_PARSE_C) && \ - !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) - mbedtls_pk_free( &handshake->peer_pubkey ); -#endif /* MBEDTLS_X509_CRT_PARSE_C && !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - mbedtls_free( handshake->verify_cookie ); - mbedtls_ssl_flight_free( handshake->flight ); - mbedtls_ssl_buffering_free( ssl ); -#endif - -#if defined(MBEDTLS_ECDH_C) && \ - defined(MBEDTLS_USE_PSA_CRYPTO) - psa_destroy_key( handshake->ecdh_psa_privkey ); -#endif /* MBEDTLS_ECDH_C && MBEDTLS_USE_PSA_CRYPTO */ - - mbedtls_platform_zeroize( handshake, - sizeof( mbedtls_ssl_handshake_params ) ); -} - -void mbedtls_ssl_session_free( mbedtls_ssl_session *session ) -{ - if( session == NULL ) - return; - -#if defined(MBEDTLS_X509_CRT_PARSE_C) - ssl_clear_peer_cert( session ); -#endif - -#if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C) - mbedtls_free( session->ticket ); -#endif - - mbedtls_platform_zeroize( session, sizeof( mbedtls_ssl_session ) ); -} - -#if defined(MBEDTLS_SSL_CONTEXT_SERIALIZATION) - -#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) -#define SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_CONNECTION_ID 1u -#else -#define SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_CONNECTION_ID 0u -#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ - -#if defined(MBEDTLS_SSL_DTLS_BADMAC_LIMIT) -#define SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_BADMAC_LIMIT 1u -#else -#define SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_BADMAC_LIMIT 0u -#endif /* MBEDTLS_SSL_DTLS_BADMAC_LIMIT */ - -#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY) -#define SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_ANTI_REPLAY 1u -#else -#define SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_ANTI_REPLAY 0u -#endif /* MBEDTLS_SSL_DTLS_ANTI_REPLAY */ - -#if defined(MBEDTLS_SSL_ALPN) -#define SSL_SERIALIZED_CONTEXT_CONFIG_ALPN 1u -#else -#define SSL_SERIALIZED_CONTEXT_CONFIG_ALPN 0u -#endif /* MBEDTLS_SSL_ALPN */ - -#define SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_CONNECTION_ID_BIT 0 -#define SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_BADMAC_LIMIT_BIT 1 -#define SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_ANTI_REPLAY_BIT 2 -#define SSL_SERIALIZED_CONTEXT_CONFIG_ALPN_BIT 3 - -#define SSL_SERIALIZED_CONTEXT_CONFIG_BITFLAG \ - ( (uint32_t) ( \ - ( SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_CONNECTION_ID << SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_CONNECTION_ID_BIT ) | \ - ( SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_BADMAC_LIMIT << SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_BADMAC_LIMIT_BIT ) | \ - ( SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_ANTI_REPLAY << SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_ANTI_REPLAY_BIT ) | \ - ( SSL_SERIALIZED_CONTEXT_CONFIG_ALPN << SSL_SERIALIZED_CONTEXT_CONFIG_ALPN_BIT ) | \ - 0u ) ) - -static unsigned char ssl_serialized_context_header[] = { - MBEDTLS_VERSION_MAJOR, - MBEDTLS_VERSION_MINOR, - MBEDTLS_VERSION_PATCH, - ( SSL_SERIALIZED_SESSION_CONFIG_BITFLAG >> 8 ) & 0xFF, - ( SSL_SERIALIZED_SESSION_CONFIG_BITFLAG >> 0 ) & 0xFF, - ( SSL_SERIALIZED_CONTEXT_CONFIG_BITFLAG >> 16 ) & 0xFF, - ( SSL_SERIALIZED_CONTEXT_CONFIG_BITFLAG >> 8 ) & 0xFF, - ( SSL_SERIALIZED_CONTEXT_CONFIG_BITFLAG >> 0 ) & 0xFF, -}; - -/* - * Serialize a full SSL context - * - * The format of the serialized data is: - * (in the presentation language of TLS, RFC 8446 section 3) - * - * // header - * opaque mbedtls_version[3]; // major, minor, patch - * opaque context_format[5]; // version-specific field determining - * // the format of the remaining - * // serialized data. - * Note: When updating the format, remember to keep these - * version+format bytes. (We may make their size part of the API.) - * - * // session sub-structure - * opaque session<1..2^32-1>; // see mbedtls_ssl_session_save() - * // transform sub-structure - * uint8 random[64]; // ServerHello.random+ClientHello.random - * uint8 in_cid<0..2^8-1> // Connection ID: expected incoming value - * uint8 out_cid<0..2^8-1> // Connection ID: outgoing value to use - * // fields from ssl_context - * uint32 badmac_seen; // DTLS: number of records with failing MAC - * uint64 in_window_top; // DTLS: last validated record seq_num - * uint64 in_window; // DTLS: bitmask for replay protection - * uint8 disable_datagram_packing; // DTLS: only one record per datagram - * uint64 cur_out_ctr; // Record layer: outgoing sequence number - * uint16 mtu; // DTLS: path mtu (max outgoing fragment size) - * uint8 alpn_chosen<0..2^8-1> // ALPN: negotiated application protocol - * - * Note that many fields of the ssl_context or sub-structures are not - * serialized, as they fall in one of the following categories: - * - * 1. forced value (eg in_left must be 0) - * 2. pointer to dynamically-allocated memory (eg session, transform) - * 3. value can be re-derived from other data (eg session keys from MS) - * 4. value was temporary (eg content of input buffer) - * 5. value will be provided by the user again (eg I/O callbacks and context) - */ -int mbedtls_ssl_context_save( mbedtls_ssl_context *ssl, - unsigned char *buf, - size_t buf_len, - size_t *olen ) -{ - unsigned char *p = buf; - size_t used = 0; - size_t session_len; - int ret = 0; - - /* - * Enforce usage restrictions, see "return BAD_INPUT_DATA" in - * this function's documentation. - * - * These are due to assumptions/limitations in the implementation. Some of - * them are likely to stay (no handshake in progress) some might go away - * (only DTLS) but are currently used to simplify the implementation. - */ - /* The initial handshake must be over */ - if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "Initial handshake isn't over" ) ); - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - if( ssl->handshake != NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "Handshake isn't completed" ) ); - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - /* Double-check that sub-structures are indeed ready */ - if( ssl->transform == NULL || ssl->session == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "Serialised structures aren't ready" ) ); - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - /* There must be no pending incoming or outgoing data */ - if( mbedtls_ssl_check_pending( ssl ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "There is pending incoming data" ) ); - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - if( ssl->out_left != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "There is pending outgoing data" ) ); - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - /* Protocol must be DLTS, not TLS */ - if( ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "Only DTLS is supported" ) ); - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - /* Version must be 1.2 */ - if( ssl->major_ver != MBEDTLS_SSL_MAJOR_VERSION_3 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "Only version 1.2 supported" ) ); - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - if( ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_3 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "Only version 1.2 supported" ) ); - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - /* We must be using an AEAD ciphersuite */ - if( mbedtls_ssl_transform_uses_aead( ssl->transform ) != 1 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "Only AEAD ciphersuites supported" ) ); - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - /* Renegotiation must not be enabled */ -#if defined(MBEDTLS_SSL_RENEGOTIATION) - if( ssl->conf->disable_renegotiation != MBEDTLS_SSL_RENEGOTIATION_DISABLED ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "Renegotiation must not be enabled" ) ); - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } -#endif - - /* - * Version and format identifier - */ - used += sizeof( ssl_serialized_context_header ); - - if( used <= buf_len ) - { - memcpy( p, ssl_serialized_context_header, - sizeof( ssl_serialized_context_header ) ); - p += sizeof( ssl_serialized_context_header ); - } - - /* - * Session (length + data) - */ - ret = ssl_session_save( ssl->session, 1, NULL, 0, &session_len ); - if( ret != MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL ) - return( ret ); - - used += 4 + session_len; - if( used <= buf_len ) - { - *p++ = (unsigned char)( ( session_len >> 24 ) & 0xFF ); - *p++ = (unsigned char)( ( session_len >> 16 ) & 0xFF ); - *p++ = (unsigned char)( ( session_len >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( session_len ) & 0xFF ); - - ret = ssl_session_save( ssl->session, 1, - p, session_len, &session_len ); - if( ret != 0 ) - return( ret ); - - p += session_len; - } - - /* - * Transform - */ - used += sizeof( ssl->transform->randbytes ); - if( used <= buf_len ) - { - memcpy( p, ssl->transform->randbytes, - sizeof( ssl->transform->randbytes ) ); - p += sizeof( ssl->transform->randbytes ); - } - -#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) - used += 2 + ssl->transform->in_cid_len + ssl->transform->out_cid_len; - if( used <= buf_len ) - { - *p++ = ssl->transform->in_cid_len; - memcpy( p, ssl->transform->in_cid, ssl->transform->in_cid_len ); - p += ssl->transform->in_cid_len; - - *p++ = ssl->transform->out_cid_len; - memcpy( p, ssl->transform->out_cid, ssl->transform->out_cid_len ); - p += ssl->transform->out_cid_len; - } -#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ - - /* - * Saved fields from top-level ssl_context structure - */ -#if defined(MBEDTLS_SSL_DTLS_BADMAC_LIMIT) - used += 4; - if( used <= buf_len ) - { - *p++ = (unsigned char)( ( ssl->badmac_seen >> 24 ) & 0xFF ); - *p++ = (unsigned char)( ( ssl->badmac_seen >> 16 ) & 0xFF ); - *p++ = (unsigned char)( ( ssl->badmac_seen >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( ssl->badmac_seen ) & 0xFF ); - } -#endif /* MBEDTLS_SSL_DTLS_BADMAC_LIMIT */ - -#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY) - used += 16; - if( used <= buf_len ) - { - *p++ = (unsigned char)( ( ssl->in_window_top >> 56 ) & 0xFF ); - *p++ = (unsigned char)( ( ssl->in_window_top >> 48 ) & 0xFF ); - *p++ = (unsigned char)( ( ssl->in_window_top >> 40 ) & 0xFF ); - *p++ = (unsigned char)( ( ssl->in_window_top >> 32 ) & 0xFF ); - *p++ = (unsigned char)( ( ssl->in_window_top >> 24 ) & 0xFF ); - *p++ = (unsigned char)( ( ssl->in_window_top >> 16 ) & 0xFF ); - *p++ = (unsigned char)( ( ssl->in_window_top >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( ssl->in_window_top ) & 0xFF ); - - *p++ = (unsigned char)( ( ssl->in_window >> 56 ) & 0xFF ); - *p++ = (unsigned char)( ( ssl->in_window >> 48 ) & 0xFF ); - *p++ = (unsigned char)( ( ssl->in_window >> 40 ) & 0xFF ); - *p++ = (unsigned char)( ( ssl->in_window >> 32 ) & 0xFF ); - *p++ = (unsigned char)( ( ssl->in_window >> 24 ) & 0xFF ); - *p++ = (unsigned char)( ( ssl->in_window >> 16 ) & 0xFF ); - *p++ = (unsigned char)( ( ssl->in_window >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( ssl->in_window ) & 0xFF ); - } -#endif /* MBEDTLS_SSL_DTLS_ANTI_REPLAY */ - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - used += 1; - if( used <= buf_len ) - { - *p++ = ssl->disable_datagram_packing; - } -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - - used += 8; - if( used <= buf_len ) - { - memcpy( p, ssl->cur_out_ctr, 8 ); - p += 8; - } - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - used += 2; - if( used <= buf_len ) - { - *p++ = (unsigned char)( ( ssl->mtu >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( ssl->mtu ) & 0xFF ); - } -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - -#if defined(MBEDTLS_SSL_ALPN) - { - const uint8_t alpn_len = ssl->alpn_chosen - ? (uint8_t) strlen( ssl->alpn_chosen ) - : 0; - - used += 1 + alpn_len; - if( used <= buf_len ) - { - *p++ = alpn_len; - - if( ssl->alpn_chosen != NULL ) - { - memcpy( p, ssl->alpn_chosen, alpn_len ); - p += alpn_len; - } - } - } -#endif /* MBEDTLS_SSL_ALPN */ - - /* - * Done - */ - *olen = used; - - if( used > buf_len ) - return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL ); - - MBEDTLS_SSL_DEBUG_BUF( 4, "saved context", buf, used ); - - return( mbedtls_ssl_session_reset_int( ssl, 0 ) ); -} - -/* - * Helper to get TLS 1.2 PRF from ciphersuite - * (Duplicates bits of logic from ssl_set_handshake_prfs().) - */ -typedef int (*tls_prf_fn)( const unsigned char *secret, size_t slen, - const char *label, - const unsigned char *random, size_t rlen, - unsigned char *dstbuf, size_t dlen ); -static tls_prf_fn ssl_tls12prf_from_cs( int ciphersuite_id ) -{ -#if defined(MBEDTLS_SHA512_C) - const mbedtls_ssl_ciphersuite_t * const ciphersuite_info = - mbedtls_ssl_ciphersuite_from_id( ciphersuite_id ); - - if( ciphersuite_info->mac == MBEDTLS_MD_SHA384 ) - return( tls_prf_sha384 ); -#else - (void) ciphersuite_id; -#endif - return( tls_prf_sha256 ); -} - -/* - * Deserialize context, see mbedtls_ssl_context_save() for format. - * - * This internal version is wrapped by a public function that cleans up in - * case of error. - */ -static int ssl_context_load( mbedtls_ssl_context *ssl, - const unsigned char *buf, - size_t len ) -{ - const unsigned char *p = buf; - const unsigned char * const end = buf + len; - size_t session_len; - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - - /* - * The context should have been freshly setup or reset. - * Give the user an error in case of obvious misuse. - * (Checking session is useful because it won't be NULL if we're - * renegotiating, or if the user mistakenly loaded a session first.) - */ - if( ssl->state != MBEDTLS_SSL_HELLO_REQUEST || - ssl->session != NULL ) - { - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - - /* - * We can't check that the config matches the initial one, but we can at - * least check it matches the requirements for serializing. - */ - if( ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM || - ssl->conf->max_major_ver < MBEDTLS_SSL_MAJOR_VERSION_3 || - ssl->conf->min_major_ver > MBEDTLS_SSL_MAJOR_VERSION_3 || - ssl->conf->max_minor_ver < MBEDTLS_SSL_MINOR_VERSION_3 || - ssl->conf->min_minor_ver > MBEDTLS_SSL_MINOR_VERSION_3 || -#if defined(MBEDTLS_SSL_RENEGOTIATION) - ssl->conf->disable_renegotiation != MBEDTLS_SSL_RENEGOTIATION_DISABLED || -#endif - 0 ) - { - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - - MBEDTLS_SSL_DEBUG_BUF( 4, "context to load", buf, len ); - - /* - * Check version identifier - */ - if( (size_t)( end - p ) < sizeof( ssl_serialized_context_header ) ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - if( memcmp( p, ssl_serialized_context_header, - sizeof( ssl_serialized_context_header ) ) != 0 ) - { - return( MBEDTLS_ERR_SSL_VERSION_MISMATCH ); - } - p += sizeof( ssl_serialized_context_header ); - - /* - * Session - */ - if( (size_t)( end - p ) < 4 ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - session_len = ( (size_t) p[0] << 24 ) | - ( (size_t) p[1] << 16 ) | - ( (size_t) p[2] << 8 ) | - ( (size_t) p[3] ); - p += 4; - - /* This has been allocated by ssl_handshake_init(), called by - * by either mbedtls_ssl_session_reset_int() or mbedtls_ssl_setup(). */ - ssl->session = ssl->session_negotiate; - ssl->session_in = ssl->session; - ssl->session_out = ssl->session; - ssl->session_negotiate = NULL; - - if( (size_t)( end - p ) < session_len ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - ret = ssl_session_load( ssl->session, 1, p, session_len ); - if( ret != 0 ) - { - mbedtls_ssl_session_free( ssl->session ); - return( ret ); - } - - p += session_len; - - /* - * Transform - */ - - /* This has been allocated by ssl_handshake_init(), called by - * by either mbedtls_ssl_session_reset_int() or mbedtls_ssl_setup(). */ - ssl->transform = ssl->transform_negotiate; - ssl->transform_in = ssl->transform; - ssl->transform_out = ssl->transform; - ssl->transform_negotiate = NULL; - - /* Read random bytes and populate structure */ - if( (size_t)( end - p ) < sizeof( ssl->transform->randbytes ) ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - ret = ssl_populate_transform( ssl->transform, - ssl->session->ciphersuite, - ssl->session->master, -#if defined(MBEDTLS_SSL_SOME_MODES_USE_MAC) -#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) - ssl->session->encrypt_then_mac, -#endif -#if defined(MBEDTLS_SSL_TRUNCATED_HMAC) - ssl->session->trunc_hmac, -#endif -#endif /* MBEDTLS_SSL_SOME_MODES_USE_MAC */ -#if defined(MBEDTLS_ZLIB_SUPPORT) - ssl->session->compression, -#endif - ssl_tls12prf_from_cs( ssl->session->ciphersuite ), - p, /* currently pointing to randbytes */ - MBEDTLS_SSL_MINOR_VERSION_3, /* (D)TLS 1.2 is forced */ - ssl->conf->endpoint, - ssl ); - if( ret != 0 ) - return( ret ); - - p += sizeof( ssl->transform->randbytes ); - -#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) - /* Read connection IDs and store them */ - if( (size_t)( end - p ) < 1 ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - ssl->transform->in_cid_len = *p++; - - if( (size_t)( end - p ) < ssl->transform->in_cid_len + 1u ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - memcpy( ssl->transform->in_cid, p, ssl->transform->in_cid_len ); - p += ssl->transform->in_cid_len; - - ssl->transform->out_cid_len = *p++; - - if( (size_t)( end - p ) < ssl->transform->out_cid_len ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - memcpy( ssl->transform->out_cid, p, ssl->transform->out_cid_len ); - p += ssl->transform->out_cid_len; -#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ - - /* - * Saved fields from top-level ssl_context structure - */ -#if defined(MBEDTLS_SSL_DTLS_BADMAC_LIMIT) - if( (size_t)( end - p ) < 4 ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - ssl->badmac_seen = ( (uint32_t) p[0] << 24 ) | - ( (uint32_t) p[1] << 16 ) | - ( (uint32_t) p[2] << 8 ) | - ( (uint32_t) p[3] ); - p += 4; -#endif /* MBEDTLS_SSL_DTLS_BADMAC_LIMIT */ - -#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY) - if( (size_t)( end - p ) < 16 ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - ssl->in_window_top = ( (uint64_t) p[0] << 56 ) | - ( (uint64_t) p[1] << 48 ) | - ( (uint64_t) p[2] << 40 ) | - ( (uint64_t) p[3] << 32 ) | - ( (uint64_t) p[4] << 24 ) | - ( (uint64_t) p[5] << 16 ) | - ( (uint64_t) p[6] << 8 ) | - ( (uint64_t) p[7] ); - p += 8; - - ssl->in_window = ( (uint64_t) p[0] << 56 ) | - ( (uint64_t) p[1] << 48 ) | - ( (uint64_t) p[2] << 40 ) | - ( (uint64_t) p[3] << 32 ) | - ( (uint64_t) p[4] << 24 ) | - ( (uint64_t) p[5] << 16 ) | - ( (uint64_t) p[6] << 8 ) | - ( (uint64_t) p[7] ); - p += 8; -#endif /* MBEDTLS_SSL_DTLS_ANTI_REPLAY */ - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( (size_t)( end - p ) < 1 ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - ssl->disable_datagram_packing = *p++; -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - - if( (size_t)( end - p ) < 8 ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - memcpy( ssl->cur_out_ctr, p, 8 ); - p += 8; - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( (size_t)( end - p ) < 2 ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - ssl->mtu = ( p[0] << 8 ) | p[1]; - p += 2; -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - -#if defined(MBEDTLS_SSL_ALPN) - { - uint8_t alpn_len; - const char **cur; - - if( (size_t)( end - p ) < 1 ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - alpn_len = *p++; - - if( alpn_len != 0 && ssl->conf->alpn_list != NULL ) - { - /* alpn_chosen should point to an item in the configured list */ - for( cur = ssl->conf->alpn_list; *cur != NULL; cur++ ) - { - if( strlen( *cur ) == alpn_len && - memcmp( p, cur, alpn_len ) == 0 ) - { - ssl->alpn_chosen = *cur; - break; - } - } - } - - /* can only happen on conf mismatch */ - if( alpn_len != 0 && ssl->alpn_chosen == NULL ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - p += alpn_len; - } -#endif /* MBEDTLS_SSL_ALPN */ - - /* - * Forced fields from top-level ssl_context structure - * - * Most of them already set to the correct value by mbedtls_ssl_init() and - * mbedtls_ssl_reset(), so we only need to set the remaining ones. - */ - ssl->state = MBEDTLS_SSL_HANDSHAKE_OVER; - - ssl->major_ver = MBEDTLS_SSL_MAJOR_VERSION_3; - ssl->minor_ver = MBEDTLS_SSL_MINOR_VERSION_3; - - /* Adjust pointers for header fields of outgoing records to - * the given transform, accounting for explicit IV and CID. */ - mbedtls_ssl_update_out_pointers( ssl, ssl->transform ); - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - ssl->in_epoch = 1; -#endif - - /* mbedtls_ssl_reset() leaves the handshake sub-structure allocated, - * which we don't want - otherwise we'd end up freeing the wrong transform - * by calling mbedtls_ssl_handshake_wrapup_free_hs_transform() - * inappropriately. */ - if( ssl->handshake != NULL ) - { - mbedtls_ssl_handshake_free( ssl ); - mbedtls_free( ssl->handshake ); - ssl->handshake = NULL; - } - - /* - * Done - should have consumed entire buffer - */ - if( p != end ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - return( 0 ); -} - -/* - * Deserialize context: public wrapper for error cleaning - */ -int mbedtls_ssl_context_load( mbedtls_ssl_context *context, - const unsigned char *buf, - size_t len ) -{ - int ret = ssl_context_load( context, buf, len ); - - if( ret != 0 ) - mbedtls_ssl_free( context ); - - return( ret ); -} -#endif /* MBEDTLS_SSL_CONTEXT_SERIALIZATION */ - -/* - * Free an SSL context - */ -void mbedtls_ssl_free( mbedtls_ssl_context *ssl ) -{ - if( ssl == NULL ) - return; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> free" ) ); - - if( ssl->out_buf != NULL ) - { - mbedtls_platform_zeroize( ssl->out_buf, MBEDTLS_SSL_OUT_BUFFER_LEN ); - mbedtls_free( ssl->out_buf ); - } - - if( ssl->in_buf != NULL ) - { - mbedtls_platform_zeroize( ssl->in_buf, MBEDTLS_SSL_IN_BUFFER_LEN ); - mbedtls_free( ssl->in_buf ); - } - -#if defined(MBEDTLS_ZLIB_SUPPORT) - if( ssl->compress_buf != NULL ) - { - mbedtls_platform_zeroize( ssl->compress_buf, MBEDTLS_SSL_COMPRESS_BUFFER_LEN ); - mbedtls_free( ssl->compress_buf ); - } -#endif - - if( ssl->transform ) - { - mbedtls_ssl_transform_free( ssl->transform ); - mbedtls_free( ssl->transform ); - } - - if( ssl->handshake ) - { - mbedtls_ssl_handshake_free( ssl ); - mbedtls_ssl_transform_free( ssl->transform_negotiate ); - mbedtls_ssl_session_free( ssl->session_negotiate ); - - mbedtls_free( ssl->handshake ); - mbedtls_free( ssl->transform_negotiate ); - mbedtls_free( ssl->session_negotiate ); - } - - if( ssl->session ) - { - mbedtls_ssl_session_free( ssl->session ); - mbedtls_free( ssl->session ); - } - -#if defined(MBEDTLS_X509_CRT_PARSE_C) - if( ssl->hostname != NULL ) - { - mbedtls_platform_zeroize( ssl->hostname, strlen( ssl->hostname ) ); - mbedtls_free( ssl->hostname ); - } -#endif - -#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL) - if( mbedtls_ssl_hw_record_finish != NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "going for mbedtls_ssl_hw_record_finish()" ) ); - mbedtls_ssl_hw_record_finish( ssl ); - } -#endif - -#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C) - mbedtls_free( ssl->cli_id ); -#endif - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= free" ) ); - - /* Actually clear after last debug message */ - mbedtls_platform_zeroize( ssl, sizeof( mbedtls_ssl_context ) ); -} - -/* - * Initialze mbedtls_ssl_config - */ -void mbedtls_ssl_config_init( mbedtls_ssl_config *conf ) -{ - memset( conf, 0, sizeof( mbedtls_ssl_config ) ); -} - -#if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) -static int ssl_preset_default_hashes[] = { -#if defined(MBEDTLS_SHA512_C) - MBEDTLS_MD_SHA512, - MBEDTLS_MD_SHA384, -#endif -#if defined(MBEDTLS_SHA256_C) - MBEDTLS_MD_SHA256, - MBEDTLS_MD_SHA224, -#endif -#if defined(MBEDTLS_SHA1_C) && defined(MBEDTLS_TLS_DEFAULT_ALLOW_SHA1_IN_KEY_EXCHANGE) - MBEDTLS_MD_SHA1, -#endif - MBEDTLS_MD_NONE -}; -#endif - -static int ssl_preset_suiteb_ciphersuites[] = { - MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, - MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384, - 0 -}; - -#if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) -static int ssl_preset_suiteb_hashes[] = { - MBEDTLS_MD_SHA256, - MBEDTLS_MD_SHA384, - MBEDTLS_MD_NONE -}; -#endif - -#if defined(MBEDTLS_ECP_C) -static mbedtls_ecp_group_id ssl_preset_suiteb_curves[] = { -#if defined(MBEDTLS_ECP_DP_SECP256R1_ENABLED) - MBEDTLS_ECP_DP_SECP256R1, -#endif -#if defined(MBEDTLS_ECP_DP_SECP384R1_ENABLED) - MBEDTLS_ECP_DP_SECP384R1, -#endif - MBEDTLS_ECP_DP_NONE -}; -#endif - -/* - * Load default in mbedtls_ssl_config - */ -int mbedtls_ssl_config_defaults( mbedtls_ssl_config *conf, - int endpoint, int transport, int preset ) -{ -#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_SRV_C) - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; -#endif - - /* Use the functions here so that they are covered in tests, - * but otherwise access member directly for efficiency */ - mbedtls_ssl_conf_endpoint( conf, endpoint ); - mbedtls_ssl_conf_transport( conf, transport ); - - /* - * Things that are common to all presets - */ -#if defined(MBEDTLS_SSL_CLI_C) - if( endpoint == MBEDTLS_SSL_IS_CLIENT ) - { - conf->authmode = MBEDTLS_SSL_VERIFY_REQUIRED; -#if defined(MBEDTLS_SSL_SESSION_TICKETS) - conf->session_tickets = MBEDTLS_SSL_SESSION_TICKETS_ENABLED; -#endif - } -#endif - -#if defined(MBEDTLS_ARC4_C) - conf->arc4_disabled = MBEDTLS_SSL_ARC4_DISABLED; -#endif - -#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) - conf->encrypt_then_mac = MBEDTLS_SSL_ETM_ENABLED; -#endif - -#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET) - conf->extended_ms = MBEDTLS_SSL_EXTENDED_MS_ENABLED; -#endif - -#if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING) - conf->cbc_record_splitting = MBEDTLS_SSL_CBC_RECORD_SPLITTING_ENABLED; -#endif - -#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C) - conf->f_cookie_write = ssl_cookie_write_dummy; - conf->f_cookie_check = ssl_cookie_check_dummy; -#endif - -#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY) - conf->anti_replay = MBEDTLS_SSL_ANTI_REPLAY_ENABLED; -#endif - -#if defined(MBEDTLS_SSL_SRV_C) - conf->cert_req_ca_list = MBEDTLS_SSL_CERT_REQ_CA_LIST_ENABLED; -#endif - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - conf->hs_timeout_min = MBEDTLS_SSL_DTLS_TIMEOUT_DFL_MIN; - conf->hs_timeout_max = MBEDTLS_SSL_DTLS_TIMEOUT_DFL_MAX; -#endif - -#if defined(MBEDTLS_SSL_RENEGOTIATION) - conf->renego_max_records = MBEDTLS_SSL_RENEGO_MAX_RECORDS_DEFAULT; - memset( conf->renego_period, 0x00, 2 ); - memset( conf->renego_period + 2, 0xFF, 6 ); -#endif - -#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_SRV_C) - if( endpoint == MBEDTLS_SSL_IS_SERVER ) - { - const unsigned char dhm_p[] = - MBEDTLS_DHM_RFC3526_MODP_2048_P_BIN; - const unsigned char dhm_g[] = - MBEDTLS_DHM_RFC3526_MODP_2048_G_BIN; - - if ( ( ret = mbedtls_ssl_conf_dh_param_bin( conf, - dhm_p, sizeof( dhm_p ), - dhm_g, sizeof( dhm_g ) ) ) != 0 ) - { - return( ret ); - } - } -#endif - - /* - * Preset-specific defaults - */ - switch( preset ) - { - /* - * NSA Suite B - */ - case MBEDTLS_SSL_PRESET_SUITEB: - conf->min_major_ver = MBEDTLS_SSL_MAJOR_VERSION_3; - conf->min_minor_ver = MBEDTLS_SSL_MINOR_VERSION_3; /* TLS 1.2 */ - conf->max_major_ver = MBEDTLS_SSL_MAX_MAJOR_VERSION; - conf->max_minor_ver = MBEDTLS_SSL_MAX_MINOR_VERSION; - - conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_0] = - conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_1] = - conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_2] = - conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_3] = - ssl_preset_suiteb_ciphersuites; - -#if defined(MBEDTLS_X509_CRT_PARSE_C) - conf->cert_profile = &mbedtls_x509_crt_profile_suiteb; -#endif - -#if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) - conf->sig_hashes = ssl_preset_suiteb_hashes; -#endif - -#if defined(MBEDTLS_ECP_C) - conf->curve_list = ssl_preset_suiteb_curves; -#endif - break; - - /* - * Default - */ - default: - conf->min_major_ver = ( MBEDTLS_SSL_MIN_MAJOR_VERSION > - MBEDTLS_SSL_MIN_VALID_MAJOR_VERSION ) ? - MBEDTLS_SSL_MIN_MAJOR_VERSION : - MBEDTLS_SSL_MIN_VALID_MAJOR_VERSION; - conf->min_minor_ver = ( MBEDTLS_SSL_MIN_MINOR_VERSION > - MBEDTLS_SSL_MIN_VALID_MINOR_VERSION ) ? - MBEDTLS_SSL_MIN_MINOR_VERSION : - MBEDTLS_SSL_MIN_VALID_MINOR_VERSION; - conf->max_major_ver = MBEDTLS_SSL_MAX_MAJOR_VERSION; - conf->max_minor_ver = MBEDTLS_SSL_MAX_MINOR_VERSION; - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - conf->min_minor_ver = MBEDTLS_SSL_MINOR_VERSION_2; -#endif - - conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_0] = - conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_1] = - conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_2] = - conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_3] = - mbedtls_ssl_list_ciphersuites(); - -#if defined(MBEDTLS_X509_CRT_PARSE_C) - conf->cert_profile = &mbedtls_x509_crt_profile_default; -#endif - -#if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) - conf->sig_hashes = ssl_preset_default_hashes; -#endif - -#if defined(MBEDTLS_ECP_C) - conf->curve_list = mbedtls_ecp_grp_id_list(); -#endif - -#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_CLI_C) - conf->dhm_min_bitlen = 1024; -#endif - } - - return( 0 ); -} - -/* - * Free mbedtls_ssl_config - */ -void mbedtls_ssl_config_free( mbedtls_ssl_config *conf ) -{ -#if defined(MBEDTLS_DHM_C) - mbedtls_mpi_free( &conf->dhm_P ); - mbedtls_mpi_free( &conf->dhm_G ); -#endif - -#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED) - if( conf->psk != NULL ) - { - mbedtls_platform_zeroize( conf->psk, conf->psk_len ); - mbedtls_free( conf->psk ); - conf->psk = NULL; - conf->psk_len = 0; - } - - if( conf->psk_identity != NULL ) - { - mbedtls_platform_zeroize( conf->psk_identity, conf->psk_identity_len ); - mbedtls_free( conf->psk_identity ); - conf->psk_identity = NULL; - conf->psk_identity_len = 0; - } -#endif - -#if defined(MBEDTLS_X509_CRT_PARSE_C) - ssl_key_cert_free( conf->key_cert ); -#endif - - mbedtls_platform_zeroize( conf, sizeof( mbedtls_ssl_config ) ); -} - -#if defined(MBEDTLS_PK_C) && \ - ( defined(MBEDTLS_RSA_C) || defined(MBEDTLS_ECDSA_C) ) -/* - * Convert between MBEDTLS_PK_XXX and SSL_SIG_XXX - */ -unsigned char mbedtls_ssl_sig_from_pk( mbedtls_pk_context *pk ) -{ -#if defined(MBEDTLS_RSA_C) - if( mbedtls_pk_can_do( pk, MBEDTLS_PK_RSA ) ) - return( MBEDTLS_SSL_SIG_RSA ); -#endif -#if defined(MBEDTLS_ECDSA_C) - if( mbedtls_pk_can_do( pk, MBEDTLS_PK_ECDSA ) ) - return( MBEDTLS_SSL_SIG_ECDSA ); -#endif - return( MBEDTLS_SSL_SIG_ANON ); -} - -unsigned char mbedtls_ssl_sig_from_pk_alg( mbedtls_pk_type_t type ) -{ - switch( type ) { - case MBEDTLS_PK_RSA: - return( MBEDTLS_SSL_SIG_RSA ); - case MBEDTLS_PK_ECDSA: - case MBEDTLS_PK_ECKEY: - return( MBEDTLS_SSL_SIG_ECDSA ); - default: - return( MBEDTLS_SSL_SIG_ANON ); - } -} - -mbedtls_pk_type_t mbedtls_ssl_pk_alg_from_sig( unsigned char sig ) -{ - switch( sig ) - { -#if defined(MBEDTLS_RSA_C) - case MBEDTLS_SSL_SIG_RSA: - return( MBEDTLS_PK_RSA ); -#endif -#if defined(MBEDTLS_ECDSA_C) - case MBEDTLS_SSL_SIG_ECDSA: - return( MBEDTLS_PK_ECDSA ); -#endif - default: - return( MBEDTLS_PK_NONE ); - } -} -#endif /* MBEDTLS_PK_C && ( MBEDTLS_RSA_C || MBEDTLS_ECDSA_C ) */ - -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \ - defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) - -/* Find an entry in a signature-hash set matching a given hash algorithm. */ -mbedtls_md_type_t mbedtls_ssl_sig_hash_set_find( mbedtls_ssl_sig_hash_set_t *set, - mbedtls_pk_type_t sig_alg ) -{ - switch( sig_alg ) - { - case MBEDTLS_PK_RSA: - return( set->rsa ); - case MBEDTLS_PK_ECDSA: - return( set->ecdsa ); - default: - return( MBEDTLS_MD_NONE ); - } -} - -/* Add a signature-hash-pair to a signature-hash set */ -void mbedtls_ssl_sig_hash_set_add( mbedtls_ssl_sig_hash_set_t *set, - mbedtls_pk_type_t sig_alg, - mbedtls_md_type_t md_alg ) -{ - switch( sig_alg ) - { - case MBEDTLS_PK_RSA: - if( set->rsa == MBEDTLS_MD_NONE ) - set->rsa = md_alg; - break; - - case MBEDTLS_PK_ECDSA: - if( set->ecdsa == MBEDTLS_MD_NONE ) - set->ecdsa = md_alg; - break; - - default: - break; - } -} - -/* Allow exactly one hash algorithm for each signature. */ -void mbedtls_ssl_sig_hash_set_const_hash( mbedtls_ssl_sig_hash_set_t *set, - mbedtls_md_type_t md_alg ) -{ - set->rsa = md_alg; - set->ecdsa = md_alg; -} - -#endif /* MBEDTLS_SSL_PROTO_TLS1_2) && - MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */ - -/* - * Convert from MBEDTLS_SSL_HASH_XXX to MBEDTLS_MD_XXX - */ -mbedtls_md_type_t mbedtls_ssl_md_alg_from_hash( unsigned char hash ) -{ - switch( hash ) - { -#if defined(MBEDTLS_MD5_C) - case MBEDTLS_SSL_HASH_MD5: - return( MBEDTLS_MD_MD5 ); -#endif -#if defined(MBEDTLS_SHA1_C) - case MBEDTLS_SSL_HASH_SHA1: - return( MBEDTLS_MD_SHA1 ); -#endif -#if defined(MBEDTLS_SHA256_C) - case MBEDTLS_SSL_HASH_SHA224: - return( MBEDTLS_MD_SHA224 ); - case MBEDTLS_SSL_HASH_SHA256: - return( MBEDTLS_MD_SHA256 ); -#endif -#if defined(MBEDTLS_SHA512_C) - case MBEDTLS_SSL_HASH_SHA384: - return( MBEDTLS_MD_SHA384 ); - case MBEDTLS_SSL_HASH_SHA512: - return( MBEDTLS_MD_SHA512 ); -#endif - default: - return( MBEDTLS_MD_NONE ); - } -} - -/* - * Convert from MBEDTLS_MD_XXX to MBEDTLS_SSL_HASH_XXX - */ -unsigned char mbedtls_ssl_hash_from_md_alg( int md ) -{ - switch( md ) - { -#if defined(MBEDTLS_MD5_C) - case MBEDTLS_MD_MD5: - return( MBEDTLS_SSL_HASH_MD5 ); -#endif -#if defined(MBEDTLS_SHA1_C) - case MBEDTLS_MD_SHA1: - return( MBEDTLS_SSL_HASH_SHA1 ); -#endif -#if defined(MBEDTLS_SHA256_C) - case MBEDTLS_MD_SHA224: - return( MBEDTLS_SSL_HASH_SHA224 ); - case MBEDTLS_MD_SHA256: - return( MBEDTLS_SSL_HASH_SHA256 ); -#endif -#if defined(MBEDTLS_SHA512_C) - case MBEDTLS_MD_SHA384: - return( MBEDTLS_SSL_HASH_SHA384 ); - case MBEDTLS_MD_SHA512: - return( MBEDTLS_SSL_HASH_SHA512 ); -#endif - default: - return( MBEDTLS_SSL_HASH_NONE ); - } -} - -#if defined(MBEDTLS_ECP_C) -/* - * Check if a curve proposed by the peer is in our list. - * Return 0 if we're willing to use it, -1 otherwise. - */ -int mbedtls_ssl_check_curve( const mbedtls_ssl_context *ssl, mbedtls_ecp_group_id grp_id ) -{ - const mbedtls_ecp_group_id *gid; - - if( ssl->conf->curve_list == NULL ) - return( -1 ); - - for( gid = ssl->conf->curve_list; *gid != MBEDTLS_ECP_DP_NONE; gid++ ) - if( *gid == grp_id ) - return( 0 ); - - return( -1 ); -} -#endif /* MBEDTLS_ECP_C */ - -#if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) -/* - * Check if a hash proposed by the peer is in our list. - * Return 0 if we're willing to use it, -1 otherwise. - */ -int mbedtls_ssl_check_sig_hash( const mbedtls_ssl_context *ssl, - mbedtls_md_type_t md ) -{ - const int *cur; - - if( ssl->conf->sig_hashes == NULL ) - return( -1 ); - - for( cur = ssl->conf->sig_hashes; *cur != MBEDTLS_MD_NONE; cur++ ) - if( *cur == (int) md ) - return( 0 ); - - return( -1 ); -} -#endif /* MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */ - -#if defined(MBEDTLS_X509_CRT_PARSE_C) -int mbedtls_ssl_check_cert_usage( const mbedtls_x509_crt *cert, - const mbedtls_ssl_ciphersuite_t *ciphersuite, - int cert_endpoint, - uint32_t *flags ) -{ - int ret = 0; -#if defined(MBEDTLS_X509_CHECK_KEY_USAGE) - int usage = 0; -#endif -#if defined(MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE) - const char *ext_oid; - size_t ext_len; -#endif - -#if !defined(MBEDTLS_X509_CHECK_KEY_USAGE) && \ - !defined(MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE) - ((void) cert); - ((void) cert_endpoint); - ((void) flags); -#endif - -#if defined(MBEDTLS_X509_CHECK_KEY_USAGE) - if( cert_endpoint == MBEDTLS_SSL_IS_SERVER ) - { - /* Server part of the key exchange */ - switch( ciphersuite->key_exchange ) - { - case MBEDTLS_KEY_EXCHANGE_RSA: - case MBEDTLS_KEY_EXCHANGE_RSA_PSK: - usage = MBEDTLS_X509_KU_KEY_ENCIPHERMENT; - break; - - case MBEDTLS_KEY_EXCHANGE_DHE_RSA: - case MBEDTLS_KEY_EXCHANGE_ECDHE_RSA: - case MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA: - usage = MBEDTLS_X509_KU_DIGITAL_SIGNATURE; - break; - - case MBEDTLS_KEY_EXCHANGE_ECDH_RSA: - case MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA: - usage = MBEDTLS_X509_KU_KEY_AGREEMENT; - break; - - /* Don't use default: we want warnings when adding new values */ - case MBEDTLS_KEY_EXCHANGE_NONE: - case MBEDTLS_KEY_EXCHANGE_PSK: - case MBEDTLS_KEY_EXCHANGE_DHE_PSK: - case MBEDTLS_KEY_EXCHANGE_ECDHE_PSK: - case MBEDTLS_KEY_EXCHANGE_ECJPAKE: - usage = 0; - } - } - else - { - /* Client auth: we only implement rsa_sign and mbedtls_ecdsa_sign for now */ - usage = MBEDTLS_X509_KU_DIGITAL_SIGNATURE; - } - - if( mbedtls_x509_crt_check_key_usage( cert, usage ) != 0 ) - { - *flags |= MBEDTLS_X509_BADCERT_KEY_USAGE; - ret = -1; - } -#else - ((void) ciphersuite); -#endif /* MBEDTLS_X509_CHECK_KEY_USAGE */ - -#if defined(MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE) - if( cert_endpoint == MBEDTLS_SSL_IS_SERVER ) - { - ext_oid = MBEDTLS_OID_SERVER_AUTH; - ext_len = MBEDTLS_OID_SIZE( MBEDTLS_OID_SERVER_AUTH ); - } - else - { - ext_oid = MBEDTLS_OID_CLIENT_AUTH; - ext_len = MBEDTLS_OID_SIZE( MBEDTLS_OID_CLIENT_AUTH ); - } - - if( mbedtls_x509_crt_check_extended_key_usage( cert, ext_oid, ext_len ) != 0 ) - { - *flags |= MBEDTLS_X509_BADCERT_EXT_KEY_USAGE; - ret = -1; - } -#endif /* MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE */ - - return( ret ); -} -#endif /* MBEDTLS_X509_CRT_PARSE_C */ - /* * Convert version numbers to/from wire format * and, for DTLS, to/from TLS equivalent. @@ -12695,261 +5640,4 @@ void mbedtls_ssl_read_version( int *major, int *minor, int transport, } } -int mbedtls_ssl_set_calc_verify_md( mbedtls_ssl_context *ssl, int md ) -{ -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) - if( ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_3 ) - return MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH; - - switch( md ) - { -#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) -#if defined(MBEDTLS_MD5_C) - case MBEDTLS_SSL_HASH_MD5: - return MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH; -#endif -#if defined(MBEDTLS_SHA1_C) - case MBEDTLS_SSL_HASH_SHA1: - ssl->handshake->calc_verify = ssl_calc_verify_tls; - break; -#endif -#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 */ -#if defined(MBEDTLS_SHA512_C) - case MBEDTLS_SSL_HASH_SHA384: - ssl->handshake->calc_verify = ssl_calc_verify_tls_sha384; - break; -#endif -#if defined(MBEDTLS_SHA256_C) - case MBEDTLS_SSL_HASH_SHA256: - ssl->handshake->calc_verify = ssl_calc_verify_tls_sha256; - break; -#endif - default: - return MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH; - } - - return 0; -#else /* !MBEDTLS_SSL_PROTO_TLS1_2 */ - (void) ssl; - (void) md; - - return MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH; -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ -} - -#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \ - defined(MBEDTLS_SSL_PROTO_TLS1_1) -int mbedtls_ssl_get_key_exchange_md_ssl_tls( mbedtls_ssl_context *ssl, - unsigned char *output, - unsigned char *data, size_t data_len ) -{ - int ret = 0; - mbedtls_md5_context mbedtls_md5; - mbedtls_sha1_context mbedtls_sha1; - - mbedtls_md5_init( &mbedtls_md5 ); - mbedtls_sha1_init( &mbedtls_sha1 ); - - /* - * digitally-signed struct { - * opaque md5_hash[16]; - * opaque sha_hash[20]; - * }; - * - * md5_hash - * MD5(ClientHello.random + ServerHello.random - * + ServerParams); - * sha_hash - * SHA(ClientHello.random + ServerHello.random - * + ServerParams); - */ - if( ( ret = mbedtls_md5_starts_ret( &mbedtls_md5 ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md5_starts_ret", ret ); - goto exit; - } - if( ( ret = mbedtls_md5_update_ret( &mbedtls_md5, - ssl->handshake->randbytes, 64 ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md5_update_ret", ret ); - goto exit; - } - if( ( ret = mbedtls_md5_update_ret( &mbedtls_md5, data, data_len ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md5_update_ret", ret ); - goto exit; - } - if( ( ret = mbedtls_md5_finish_ret( &mbedtls_md5, output ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md5_finish_ret", ret ); - goto exit; - } - - if( ( ret = mbedtls_sha1_starts_ret( &mbedtls_sha1 ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_sha1_starts_ret", ret ); - goto exit; - } - if( ( ret = mbedtls_sha1_update_ret( &mbedtls_sha1, - ssl->handshake->randbytes, 64 ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_sha1_update_ret", ret ); - goto exit; - } - if( ( ret = mbedtls_sha1_update_ret( &mbedtls_sha1, data, - data_len ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_sha1_update_ret", ret ); - goto exit; - } - if( ( ret = mbedtls_sha1_finish_ret( &mbedtls_sha1, - output + 16 ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_sha1_finish_ret", ret ); - goto exit; - } - -exit: - mbedtls_md5_free( &mbedtls_md5 ); - mbedtls_sha1_free( &mbedtls_sha1 ); - - if( ret != 0 ) - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR ); - - return( ret ); - -} -#endif /* MBEDTLS_SSL_PROTO_SSL3 || MBEDTLS_SSL_PROTO_TLS1 || \ - MBEDTLS_SSL_PROTO_TLS1_1 */ - -#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \ - defined(MBEDTLS_SSL_PROTO_TLS1_2) - -#if defined(MBEDTLS_USE_PSA_CRYPTO) -int mbedtls_ssl_get_key_exchange_md_tls1_2( mbedtls_ssl_context *ssl, - unsigned char *hash, size_t *hashlen, - unsigned char *data, size_t data_len, - mbedtls_md_type_t md_alg ) -{ - psa_status_t status; - psa_hash_operation_t hash_operation = PSA_HASH_OPERATION_INIT; - psa_algorithm_t hash_alg = mbedtls_psa_translate_md( md_alg ); - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "Perform PSA-based computation of digest of ServerKeyExchange" ) ); - - if( ( status = psa_hash_setup( &hash_operation, - hash_alg ) ) != PSA_SUCCESS ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "psa_hash_setup", status ); - goto exit; - } - - if( ( status = psa_hash_update( &hash_operation, ssl->handshake->randbytes, - 64 ) ) != PSA_SUCCESS ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "psa_hash_update", status ); - goto exit; - } - - if( ( status = psa_hash_update( &hash_operation, - data, data_len ) ) != PSA_SUCCESS ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "psa_hash_update", status ); - goto exit; - } - - if( ( status = psa_hash_finish( &hash_operation, hash, MBEDTLS_MD_MAX_SIZE, - hashlen ) ) != PSA_SUCCESS ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "psa_hash_finish", status ); - goto exit; - } - -exit: - if( status != PSA_SUCCESS ) - { - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR ); - switch( status ) - { - case PSA_ERROR_NOT_SUPPORTED: - return( MBEDTLS_ERR_MD_FEATURE_UNAVAILABLE ); - case PSA_ERROR_BAD_STATE: /* Intentional fallthrough */ - case PSA_ERROR_BUFFER_TOO_SMALL: - return( MBEDTLS_ERR_MD_BAD_INPUT_DATA ); - case PSA_ERROR_INSUFFICIENT_MEMORY: - return( MBEDTLS_ERR_MD_ALLOC_FAILED ); - default: - return( MBEDTLS_ERR_MD_HW_ACCEL_FAILED ); - } - } - return( 0 ); -} - -#else - -int mbedtls_ssl_get_key_exchange_md_tls1_2( mbedtls_ssl_context *ssl, - unsigned char *hash, size_t *hashlen, - unsigned char *data, size_t data_len, - mbedtls_md_type_t md_alg ) -{ - int ret = 0; - mbedtls_md_context_t ctx; - const mbedtls_md_info_t *md_info = mbedtls_md_info_from_type( md_alg ); - *hashlen = mbedtls_md_get_size( md_info ); - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "Perform mbedtls-based computation of digest of ServerKeyExchange" ) ); - - mbedtls_md_init( &ctx ); - - /* - * digitally-signed struct { - * opaque client_random[32]; - * opaque server_random[32]; - * ServerDHParams params; - * }; - */ - if( ( ret = mbedtls_md_setup( &ctx, md_info, 0 ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md_setup", ret ); - goto exit; - } - if( ( ret = mbedtls_md_starts( &ctx ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md_starts", ret ); - goto exit; - } - if( ( ret = mbedtls_md_update( &ctx, ssl->handshake->randbytes, 64 ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md_update", ret ); - goto exit; - } - if( ( ret = mbedtls_md_update( &ctx, data, data_len ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md_update", ret ); - goto exit; - } - if( ( ret = mbedtls_md_finish( &ctx, hash ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md_finish", ret ); - goto exit; - } - -exit: - mbedtls_md_free( &ctx ); - - if( ret != 0 ) - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR ); - - return( ret ); -} -#endif /* MBEDTLS_USE_PSA_CRYPTO */ - -#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 || \ - MBEDTLS_SSL_PROTO_TLS1_2 */ - #endif /* MBEDTLS_SSL_TLS_C */ - -#endif /* 0 */ diff --git a/library/ssl_tls.c b/library/ssl_tls.c index 085a0b94a5..24bf5aa046 100644 --- a/library/ssl_tls.c +++ b/library/ssl_tls.c @@ -61,107 +61,6 @@ #include "mbedtls/oid.h" #endif -static uint32_t ssl_get_hs_total_len( mbedtls_ssl_context const *ssl ); - -/* - * Start a timer. - * Passing millisecs = 0 cancels a running timer. - */ -void mbedtls_ssl_set_timer( mbedtls_ssl_context *ssl, uint32_t millisecs ) -{ - if( ssl->f_set_timer == NULL ) - return; - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "set_timer to %d ms", (int) millisecs ) ); - ssl->f_set_timer( ssl->p_timer, millisecs / 4, millisecs ); -} - -/* - * Return -1 is timer is expired, 0 if it isn't. - */ -int mbedtls_ssl_check_timer( mbedtls_ssl_context *ssl ) -{ - if( ssl->f_get_timer == NULL ) - return( 0 ); - - if( ssl->f_get_timer( ssl->p_timer ) == 2 ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "timer expired" ) ); - return( -1 ); - } - - return( 0 ); -} - -#if defined(MBEDTLS_SSL_RECORD_CHECKING) -static int ssl_parse_record_header( mbedtls_ssl_context const *ssl, - unsigned char *buf, - size_t len, - mbedtls_record *rec ); - -int mbedtls_ssl_check_record( mbedtls_ssl_context const *ssl, - unsigned char *buf, - size_t buflen ) -{ - int ret = 0; - MBEDTLS_SSL_DEBUG_MSG( 1, ( "=> mbedtls_ssl_check_record" ) ); - MBEDTLS_SSL_DEBUG_BUF( 3, "record buffer", buf, buflen ); - - /* We don't support record checking in TLS because - * (a) there doesn't seem to be a usecase for it, and - * (b) In SSLv3 and TLS 1.0, CBC record decryption has state - * and we'd need to backup the transform here. - */ - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_STREAM ) - { - ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; - goto exit; - } -#if defined(MBEDTLS_SSL_PROTO_DTLS) - else - { - mbedtls_record rec; - - ret = ssl_parse_record_header( ssl, buf, buflen, &rec ); - if( ret != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 3, "ssl_parse_record_header", ret ); - goto exit; - } - - if( ssl->transform_in != NULL ) - { - ret = mbedtls_ssl_decrypt_buf( ssl, ssl->transform_in, &rec ); - if( ret != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 3, "mbedtls_ssl_decrypt_buf", ret ); - goto exit; - } - } - } -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - -exit: - /* On success, we have decrypted the buffer in-place, so make - * sure we don't leak any plaintext data. */ - mbedtls_platform_zeroize( buf, buflen ); - - /* For the purpose of this API, treat messages with unexpected CID - * as well as such from future epochs as unexpected. */ - if( ret == MBEDTLS_ERR_SSL_UNEXPECTED_CID || - ret == MBEDTLS_ERR_SSL_EARLY_MESSAGE ) - { - ret = MBEDTLS_ERR_SSL_UNEXPECTED_RECORD; - } - - MBEDTLS_SSL_DEBUG_MSG( 1, ( "<= mbedtls_ssl_check_record" ) ); - return( ret ); -} -#endif /* MBEDTLS_SSL_RECORD_CHECKING */ - -#define SSL_DONT_FORCE_FLUSH 0 -#define SSL_FORCE_FLUSH 1 - #if defined(MBEDTLS_SSL_PROTO_DTLS) #if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) @@ -257,135 +156,6 @@ int mbedtls_ssl_get_peer_cid( mbedtls_ssl_context *ssl, } #endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ -/* Forward declarations for functions related to message buffering. */ -static void ssl_buffering_free_slot( mbedtls_ssl_context *ssl, - uint8_t slot ); -static void ssl_free_buffered_record( mbedtls_ssl_context *ssl ); -static int ssl_load_buffered_message( mbedtls_ssl_context *ssl ); -static int ssl_load_buffered_record( mbedtls_ssl_context *ssl ); -static int ssl_buffer_message( mbedtls_ssl_context *ssl ); -static int ssl_buffer_future_record( mbedtls_ssl_context *ssl, - mbedtls_record const *rec ); -static int ssl_next_record_is_in_datagram( mbedtls_ssl_context *ssl ); - -static size_t ssl_get_maximum_datagram_size( mbedtls_ssl_context const *ssl ) -{ - size_t mtu = mbedtls_ssl_get_current_mtu( ssl ); - - if( mtu != 0 && mtu < MBEDTLS_SSL_OUT_BUFFER_LEN ) - return( mtu ); - - return( MBEDTLS_SSL_OUT_BUFFER_LEN ); -} - -static int ssl_get_remaining_space_in_datagram( mbedtls_ssl_context const *ssl ) -{ - size_t const bytes_written = ssl->out_left; - size_t const mtu = ssl_get_maximum_datagram_size( ssl ); - - /* Double-check that the write-index hasn't gone - * past what we can transmit in a single datagram. */ - if( bytes_written > mtu ) - { - /* Should never happen... */ - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - - return( (int) ( mtu - bytes_written ) ); -} - -static int ssl_get_remaining_payload_in_datagram( mbedtls_ssl_context const *ssl ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - size_t remaining, expansion; - size_t max_len = MBEDTLS_SSL_OUT_CONTENT_LEN; - -#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) - const size_t mfl = mbedtls_ssl_get_max_frag_len( ssl ); - - if( max_len > mfl ) - max_len = mfl; - - /* By the standard (RFC 6066 Sect. 4), the MFL extension - * only limits the maximum record payload size, so in theory - * we would be allowed to pack multiple records of payload size - * MFL into a single datagram. However, this would mean that there's - * no way to explicitly communicate MTU restrictions to the peer. - * - * The following reduction of max_len makes sure that we never - * write datagrams larger than MFL + Record Expansion Overhead. - */ - if( max_len <= ssl->out_left ) - return( 0 ); - - max_len -= ssl->out_left; -#endif - - ret = ssl_get_remaining_space_in_datagram( ssl ); - if( ret < 0 ) - return( ret ); - remaining = (size_t) ret; - - ret = mbedtls_ssl_get_record_expansion( ssl ); - if( ret < 0 ) - return( ret ); - expansion = (size_t) ret; - - if( remaining <= expansion ) - return( 0 ); - - remaining -= expansion; - if( remaining >= max_len ) - remaining = max_len; - - return( (int) remaining ); -} - -/* - * Double the retransmit timeout value, within the allowed range, - * returning -1 if the maximum value has already been reached. - */ -static int ssl_double_retransmit_timeout( mbedtls_ssl_context *ssl ) -{ - uint32_t new_timeout; - - if( ssl->handshake->retransmit_timeout >= ssl->conf->hs_timeout_max ) - return( -1 ); - - /* Implement the final paragraph of RFC 6347 section 4.1.1.1 - * in the following way: after the initial transmission and a first - * retransmission, back off to a temporary estimated MTU of 508 bytes. - * This value is guaranteed to be deliverable (if not guaranteed to be - * delivered) of any compliant IPv4 (and IPv6) network, and should work - * on most non-IP stacks too. */ - if( ssl->handshake->retransmit_timeout != ssl->conf->hs_timeout_min ) - { - ssl->handshake->mtu = 508; - MBEDTLS_SSL_DEBUG_MSG( 2, ( "mtu autoreduction to %d bytes", ssl->handshake->mtu ) ); - } - - new_timeout = 2 * ssl->handshake->retransmit_timeout; - - /* Avoid arithmetic overflow and range overflow */ - if( new_timeout < ssl->handshake->retransmit_timeout || - new_timeout > ssl->conf->hs_timeout_max ) - { - new_timeout = ssl->conf->hs_timeout_max; - } - - ssl->handshake->retransmit_timeout = new_timeout; - MBEDTLS_SSL_DEBUG_MSG( 3, ( "update timeout value to %d millisecs", - ssl->handshake->retransmit_timeout ) ); - - return( 0 ); -} - -static void ssl_reset_retransmit_timeout( mbedtls_ssl_context *ssl ) -{ - ssl->handshake->retransmit_timeout = ssl->conf->hs_timeout_min; - MBEDTLS_SSL_DEBUG_MSG( 3, ( "update timeout value to %d millisecs", - ssl->handshake->retransmit_timeout ) ); -} #endif /* MBEDTLS_SSL_PROTO_DTLS */ #if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) @@ -475,21 +245,6 @@ int mbedtls_ssl_session_copy( mbedtls_ssl_session *dst, return( 0 ); } -#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL) -int (*mbedtls_ssl_hw_record_init)( mbedtls_ssl_context *ssl, - const unsigned char *key_enc, const unsigned char *key_dec, - size_t keylen, - const unsigned char *iv_enc, const unsigned char *iv_dec, - size_t ivlen, - const unsigned char *mac_enc, const unsigned char *mac_dec, - size_t maclen ) = NULL; -int (*mbedtls_ssl_hw_record_activate)( mbedtls_ssl_context *ssl, int direction) = NULL; -int (*mbedtls_ssl_hw_record_reset)( mbedtls_ssl_context *ssl ) = NULL; -int (*mbedtls_ssl_hw_record_write)( mbedtls_ssl_context *ssl ) = NULL; -int (*mbedtls_ssl_hw_record_read)( mbedtls_ssl_context *ssl ) = NULL; -int (*mbedtls_ssl_hw_record_finish)( mbedtls_ssl_context *ssl ) = NULL; -#endif /* MBEDTLS_SSL_HW_RECORD_ACCEL */ - /* * Key material generation */ @@ -2233,1311 +1988,6 @@ static void ssl_mac( mbedtls_md_context_t *md_ctx, } #endif /* MBEDTLS_SSL_PROTO_SSL3 */ -/* The function below is only used in the Lucky 13 counter-measure in - * mbedtls_ssl_decrypt_buf(). These are the defines that guard the call site. */ -#if defined(MBEDTLS_SSL_SOME_MODES_USE_MAC) && \ - ( defined(MBEDTLS_SSL_PROTO_TLS1) || \ - defined(MBEDTLS_SSL_PROTO_TLS1_1) || \ - defined(MBEDTLS_SSL_PROTO_TLS1_2) ) -/* This function makes sure every byte in the memory region is accessed - * (in ascending addresses order) */ -static void ssl_read_memory( unsigned char *p, size_t len ) -{ - unsigned char acc = 0; - volatile unsigned char force; - - for( ; len != 0; p++, len-- ) - acc ^= *p; - - force = acc; - (void) force; -} -#endif /* SSL_SOME_MODES_USE_MAC && ( TLS1 || TLS1_1 || TLS1_2 ) */ - -/* - * Encryption/decryption functions - */ - -#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) -/* This functions transforms a DTLS plaintext fragment and a record content - * type into an instance of the DTLSInnerPlaintext structure: - * - * struct { - * opaque content[DTLSPlaintext.length]; - * ContentType real_type; - * uint8 zeros[length_of_padding]; - * } DTLSInnerPlaintext; - * - * Input: - * - `content`: The beginning of the buffer holding the - * plaintext to be wrapped. - * - `*content_size`: The length of the plaintext in Bytes. - * - `max_len`: The number of Bytes available starting from - * `content`. This must be `>= *content_size`. - * - `rec_type`: The desired record content type. - * - * Output: - * - `content`: The beginning of the resulting DTLSInnerPlaintext structure. - * - `*content_size`: The length of the resulting DTLSInnerPlaintext structure. - * - * Returns: - * - `0` on success. - * - A negative error code if `max_len` didn't offer enough space - * for the expansion. - */ -static int ssl_cid_build_inner_plaintext( unsigned char *content, - size_t *content_size, - size_t remaining, - uint8_t rec_type ) -{ - size_t len = *content_size; - size_t pad = ( MBEDTLS_SSL_CID_PADDING_GRANULARITY - - ( len + 1 ) % MBEDTLS_SSL_CID_PADDING_GRANULARITY ) % - MBEDTLS_SSL_CID_PADDING_GRANULARITY; - - /* Write real content type */ - if( remaining == 0 ) - return( -1 ); - content[ len ] = rec_type; - len++; - remaining--; - - if( remaining < pad ) - return( -1 ); - memset( content + len, 0, pad ); - len += pad; - remaining -= pad; - - *content_size = len; - return( 0 ); -} - -/* This function parses a DTLSInnerPlaintext structure. - * See ssl_cid_build_inner_plaintext() for details. */ -static int ssl_cid_parse_inner_plaintext( unsigned char const *content, - size_t *content_size, - uint8_t *rec_type ) -{ - size_t remaining = *content_size; - - /* Determine length of padding by skipping zeroes from the back. */ - do - { - if( remaining == 0 ) - return( -1 ); - remaining--; - } while( content[ remaining ] == 0 ); - - *content_size = remaining; - *rec_type = content[ remaining ]; - - return( 0 ); -} -#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ - -/* `add_data` must have size 13 Bytes if the CID extension is disabled, - * and 13 + 1 + CID-length Bytes if the CID extension is enabled. */ -static void ssl_extract_add_data_from_record( unsigned char* add_data, - size_t *add_data_len, - mbedtls_record *rec ) -{ - /* Quoting RFC 5246 (TLS 1.2): - * - * additional_data = seq_num + TLSCompressed.type + - * TLSCompressed.version + TLSCompressed.length; - * - * For the CID extension, this is extended as follows - * (quoting draft-ietf-tls-dtls-connection-id-05, - * https://tools.ietf.org/html/draft-ietf-tls-dtls-connection-id-05): - * - * additional_data = seq_num + DTLSPlaintext.type + - * DTLSPlaintext.version + - * cid + - * cid_length + - * length_of_DTLSInnerPlaintext; - */ - - memcpy( add_data, rec->ctr, sizeof( rec->ctr ) ); - add_data[8] = rec->type; - memcpy( add_data + 9, rec->ver, sizeof( rec->ver ) ); - -#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) - if( rec->cid_len != 0 ) - { - memcpy( add_data + 11, rec->cid, rec->cid_len ); - add_data[11 + rec->cid_len + 0] = rec->cid_len; - add_data[11 + rec->cid_len + 1] = ( rec->data_len >> 8 ) & 0xFF; - add_data[11 + rec->cid_len + 2] = ( rec->data_len >> 0 ) & 0xFF; - *add_data_len = 13 + 1 + rec->cid_len; - } - else -#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ - { - add_data[11 + 0] = ( rec->data_len >> 8 ) & 0xFF; - add_data[11 + 1] = ( rec->data_len >> 0 ) & 0xFF; - *add_data_len = 13; - } -} - -int mbedtls_ssl_encrypt_buf( mbedtls_ssl_context *ssl, - mbedtls_ssl_transform *transform, - mbedtls_record *rec, - int (*f_rng)(void *, unsigned char *, size_t), - void *p_rng ) -{ - mbedtls_cipher_mode_t mode; - int auth_done = 0; - unsigned char * data; - unsigned char add_data[13 + 1 + MBEDTLS_SSL_CID_OUT_LEN_MAX ]; - size_t add_data_len; - size_t post_avail; - - /* The SSL context is only used for debugging purposes! */ -#if !defined(MBEDTLS_DEBUG_C) - ssl = NULL; /* make sure we don't use it except for debug */ - ((void) ssl); -#endif - - /* The PRNG is used for dynamic IV generation that's used - * for CBC transformations in TLS 1.1 and TLS 1.2. */ -#if !( defined(MBEDTLS_CIPHER_MODE_CBC) && \ - ( defined(MBEDTLS_AES_C) || \ - defined(MBEDTLS_ARIA_C) || \ - defined(MBEDTLS_CAMELLIA_C) ) && \ - ( defined(MBEDTLS_SSL_PROTO_TLS1_1) || defined(MBEDTLS_SSL_PROTO_TLS1_2) ) ) - ((void) f_rng); - ((void) p_rng); -#endif - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> encrypt buf" ) ); - - if( transform == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "no transform provided to encrypt_buf" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - if( rec == NULL - || rec->buf == NULL - || rec->buf_len < rec->data_offset - || rec->buf_len - rec->data_offset < rec->data_len -#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) - || rec->cid_len != 0 -#endif - ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad record structure provided to encrypt_buf" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - - data = rec->buf + rec->data_offset; - post_avail = rec->buf_len - ( rec->data_len + rec->data_offset ); - MBEDTLS_SSL_DEBUG_BUF( 4, "before encrypt: output payload", - data, rec->data_len ); - - mode = mbedtls_cipher_get_cipher_mode( &transform->cipher_ctx_enc ); - - if( rec->data_len > MBEDTLS_SSL_OUT_CONTENT_LEN ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "Record content %u too large, maximum %d", - (unsigned) rec->data_len, - MBEDTLS_SSL_OUT_CONTENT_LEN ) ); - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - -#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) - /* - * Add CID information - */ - rec->cid_len = transform->out_cid_len; - memcpy( rec->cid, transform->out_cid, transform->out_cid_len ); - MBEDTLS_SSL_DEBUG_BUF( 3, "CID", rec->cid, rec->cid_len ); - - if( rec->cid_len != 0 ) - { - /* - * Wrap plaintext into DTLSInnerPlaintext structure. - * See ssl_cid_build_inner_plaintext() for more information. - * - * Note that this changes `rec->data_len`, and hence - * `post_avail` needs to be recalculated afterwards. - */ - if( ssl_cid_build_inner_plaintext( data, - &rec->data_len, - post_avail, - rec->type ) != 0 ) - { - return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL ); - } - - rec->type = MBEDTLS_SSL_MSG_CID; - } -#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ - - post_avail = rec->buf_len - ( rec->data_len + rec->data_offset ); - - /* - * Add MAC before if needed - */ -#if defined(MBEDTLS_SSL_SOME_MODES_USE_MAC) - if( mode == MBEDTLS_MODE_STREAM || - ( mode == MBEDTLS_MODE_CBC -#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) - && transform->encrypt_then_mac == MBEDTLS_SSL_ETM_DISABLED -#endif - ) ) - { - if( post_avail < transform->maclen ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "Buffer provided for encrypted record not large enough" ) ); - return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL ); - } - -#if defined(MBEDTLS_SSL_PROTO_SSL3) - if( transform->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) - { - unsigned char mac[SSL_MAC_MAX_BYTES]; - ssl_mac( &transform->md_ctx_enc, transform->mac_enc, - data, rec->data_len, rec->ctr, rec->type, mac ); - memcpy( data + rec->data_len, mac, transform->maclen ); - } - else -#endif -#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \ - defined(MBEDTLS_SSL_PROTO_TLS1_2) - if( transform->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_1 ) - { - unsigned char mac[MBEDTLS_SSL_MAC_ADD]; - - ssl_extract_add_data_from_record( add_data, &add_data_len, rec ); - - mbedtls_md_hmac_update( &transform->md_ctx_enc, add_data, - add_data_len ); - mbedtls_md_hmac_update( &transform->md_ctx_enc, - data, rec->data_len ); - mbedtls_md_hmac_finish( &transform->md_ctx_enc, mac ); - mbedtls_md_hmac_reset( &transform->md_ctx_enc ); - - memcpy( data + rec->data_len, mac, transform->maclen ); - } - else -#endif - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - - MBEDTLS_SSL_DEBUG_BUF( 4, "computed mac", data + rec->data_len, - transform->maclen ); - - rec->data_len += transform->maclen; - post_avail -= transform->maclen; - auth_done++; - } -#endif /* MBEDTLS_SSL_SOME_MODES_USE_MAC */ - - /* - * Encrypt - */ -#if defined(MBEDTLS_ARC4_C) || defined(MBEDTLS_CIPHER_NULL_CIPHER) - if( mode == MBEDTLS_MODE_STREAM ) - { - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - size_t olen; - MBEDTLS_SSL_DEBUG_MSG( 3, ( "before encrypt: msglen = %d, " - "including %d bytes of padding", - rec->data_len, 0 ) ); - - if( ( ret = mbedtls_cipher_crypt( &transform->cipher_ctx_enc, - transform->iv_enc, transform->ivlen, - data, rec->data_len, - data, &olen ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_crypt", ret ); - return( ret ); - } - - if( rec->data_len != olen ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - } - else -#endif /* MBEDTLS_ARC4_C || MBEDTLS_CIPHER_NULL_CIPHER */ - -#if defined(MBEDTLS_GCM_C) || \ - defined(MBEDTLS_CCM_C) || \ - defined(MBEDTLS_CHACHAPOLY_C) - if( mode == MBEDTLS_MODE_GCM || - mode == MBEDTLS_MODE_CCM || - mode == MBEDTLS_MODE_CHACHAPOLY ) - { - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - unsigned char iv[12]; - size_t explicit_iv_len = transform->ivlen - transform->fixed_ivlen; - - /* Check that there's space for both the authentication tag - * and the explicit IV before and after the record content. */ - if( post_avail < transform->taglen || - rec->data_offset < explicit_iv_len ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "Buffer provided for encrypted record not large enough" ) ); - return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL ); - } - - /* - * Generate IV - */ - if( transform->ivlen == 12 && transform->fixed_ivlen == 4 ) - { - /* GCM and CCM: fixed || explicit (=seqnum) */ - memcpy( iv, transform->iv_enc, transform->fixed_ivlen ); - memcpy( iv + transform->fixed_ivlen, rec->ctr, - explicit_iv_len ); - /* Prefix record content with explicit IV. */ - memcpy( data - explicit_iv_len, rec->ctr, explicit_iv_len ); - } - else if( transform->ivlen == 12 && transform->fixed_ivlen == 12 ) - { - /* ChachaPoly: fixed XOR sequence number */ - unsigned char i; - - memcpy( iv, transform->iv_enc, transform->fixed_ivlen ); - - for( i = 0; i < 8; i++ ) - iv[i+4] ^= rec->ctr[i]; - } - else - { - /* Reminder if we ever add an AEAD mode with a different size */ - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - - ssl_extract_add_data_from_record( add_data, &add_data_len, rec ); - - MBEDTLS_SSL_DEBUG_BUF( 4, "IV used (internal)", - iv, transform->ivlen ); - MBEDTLS_SSL_DEBUG_BUF( 4, "IV used (transmitted)", - data - explicit_iv_len, explicit_iv_len ); - MBEDTLS_SSL_DEBUG_BUF( 4, "additional data used for AEAD", - add_data, add_data_len ); - MBEDTLS_SSL_DEBUG_MSG( 3, ( "before encrypt: msglen = %d, " - "including 0 bytes of padding", - rec->data_len ) ); - - /* - * Encrypt and authenticate - */ - - if( ( ret = mbedtls_cipher_auth_encrypt( &transform->cipher_ctx_enc, - iv, transform->ivlen, - add_data, add_data_len, /* add data */ - data, rec->data_len, /* source */ - data, &rec->data_len, /* destination */ - data + rec->data_len, transform->taglen ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_auth_encrypt", ret ); - return( ret ); - } - - MBEDTLS_SSL_DEBUG_BUF( 4, "after encrypt: tag", - data + rec->data_len, transform->taglen ); - - rec->data_len += transform->taglen + explicit_iv_len; - rec->data_offset -= explicit_iv_len; - post_avail -= transform->taglen; - auth_done++; - } - else -#endif /* MBEDTLS_GCM_C || MBEDTLS_CCM_C */ -#if defined(MBEDTLS_CIPHER_MODE_CBC) && \ - ( defined(MBEDTLS_AES_C) || defined(MBEDTLS_CAMELLIA_C) || defined(MBEDTLS_ARIA_C) ) - if( mode == MBEDTLS_MODE_CBC ) - { - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - size_t padlen, i; - size_t olen; - - /* Currently we're always using minimal padding - * (up to 255 bytes would be allowed). */ - padlen = transform->ivlen - ( rec->data_len + 1 ) % transform->ivlen; - if( padlen == transform->ivlen ) - padlen = 0; - - /* Check there's enough space in the buffer for the padding. */ - if( post_avail < padlen + 1 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "Buffer provided for encrypted record not large enough" ) ); - return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL ); - } - - for( i = 0; i <= padlen; i++ ) - data[rec->data_len + i] = (unsigned char) padlen; - - rec->data_len += padlen + 1; - post_avail -= padlen + 1; - -#if defined(MBEDTLS_SSL_PROTO_TLS1_1) || defined(MBEDTLS_SSL_PROTO_TLS1_2) - /* - * Prepend per-record IV for block cipher in TLS v1.1 and up as per - * Method 1 (6.2.3.2. in RFC4346 and RFC5246) - */ - if( transform->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_2 ) - { - if( f_rng == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "No PRNG provided to encrypt_record routine" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - - if( rec->data_offset < transform->ivlen ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "Buffer provided for encrypted record not large enough" ) ); - return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL ); - } - - /* - * Generate IV - */ - ret = f_rng( p_rng, transform->iv_enc, transform->ivlen ); - if( ret != 0 ) - return( ret ); - - memcpy( data - transform->ivlen, transform->iv_enc, - transform->ivlen ); - - } -#endif /* MBEDTLS_SSL_PROTO_TLS1_1 || MBEDTLS_SSL_PROTO_TLS1_2 */ - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "before encrypt: msglen = %d, " - "including %d bytes of IV and %d bytes of padding", - rec->data_len, transform->ivlen, - padlen + 1 ) ); - - if( ( ret = mbedtls_cipher_crypt( &transform->cipher_ctx_enc, - transform->iv_enc, - transform->ivlen, - data, rec->data_len, - data, &olen ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_crypt", ret ); - return( ret ); - } - - if( rec->data_len != olen ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - -#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) - if( transform->minor_ver < MBEDTLS_SSL_MINOR_VERSION_2 ) - { - /* - * Save IV in SSL3 and TLS1 - */ - memcpy( transform->iv_enc, transform->cipher_ctx_enc.iv, - transform->ivlen ); - } - else -#endif - { - data -= transform->ivlen; - rec->data_offset -= transform->ivlen; - rec->data_len += transform->ivlen; - } - -#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) - if( auth_done == 0 ) - { - unsigned char mac[MBEDTLS_SSL_MAC_ADD]; - - /* - * MAC(MAC_write_key, seq_num + - * TLSCipherText.type + - * TLSCipherText.version + - * length_of( (IV +) ENC(...) ) + - * IV + // except for TLS 1.0 - * ENC(content + padding + padding_length)); - */ - - if( post_avail < transform->maclen) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "Buffer provided for encrypted record not large enough" ) ); - return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL ); - } - - ssl_extract_add_data_from_record( add_data, &add_data_len, rec ); - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "using encrypt then mac" ) ); - MBEDTLS_SSL_DEBUG_BUF( 4, "MAC'd meta-data", add_data, - add_data_len ); - - mbedtls_md_hmac_update( &transform->md_ctx_enc, add_data, - add_data_len ); - mbedtls_md_hmac_update( &transform->md_ctx_enc, - data, rec->data_len ); - mbedtls_md_hmac_finish( &transform->md_ctx_enc, mac ); - mbedtls_md_hmac_reset( &transform->md_ctx_enc ); - - memcpy( data + rec->data_len, mac, transform->maclen ); - - rec->data_len += transform->maclen; - post_avail -= transform->maclen; - auth_done++; - } -#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */ - } - else -#endif /* MBEDTLS_CIPHER_MODE_CBC && - ( MBEDTLS_AES_C || MBEDTLS_CAMELLIA_C || MBEDTLS_ARIA_C ) */ - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - - /* Make extra sure authentication was performed, exactly once */ - if( auth_done != 1 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= encrypt buf" ) ); - - return( 0 ); -} - -int mbedtls_ssl_decrypt_buf( mbedtls_ssl_context const *ssl, - mbedtls_ssl_transform *transform, - mbedtls_record *rec ) -{ - size_t olen; - mbedtls_cipher_mode_t mode; - int ret, auth_done = 0; -#if defined(MBEDTLS_SSL_SOME_MODES_USE_MAC) - size_t padlen = 0, correct = 1; -#endif - unsigned char* data; - unsigned char add_data[13 + 1 + MBEDTLS_SSL_CID_IN_LEN_MAX ]; - size_t add_data_len; - -#if !defined(MBEDTLS_DEBUG_C) - ssl = NULL; /* make sure we don't use it except for debug */ - ((void) ssl); -#endif - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> decrypt buf" ) ); - if( rec == NULL || - rec->buf == NULL || - rec->buf_len < rec->data_offset || - rec->buf_len - rec->data_offset < rec->data_len ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad record structure provided to decrypt_buf" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - - data = rec->buf + rec->data_offset; - mode = mbedtls_cipher_get_cipher_mode( &transform->cipher_ctx_dec ); - -#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) - /* - * Match record's CID with incoming CID. - */ - if( rec->cid_len != transform->in_cid_len || - memcmp( rec->cid, transform->in_cid, rec->cid_len ) != 0 ) - { - return( MBEDTLS_ERR_SSL_UNEXPECTED_CID ); - } -#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ - -#if defined(MBEDTLS_ARC4_C) || defined(MBEDTLS_CIPHER_NULL_CIPHER) - if( mode == MBEDTLS_MODE_STREAM ) - { - padlen = 0; - if( ( ret = mbedtls_cipher_crypt( &transform->cipher_ctx_dec, - transform->iv_dec, - transform->ivlen, - data, rec->data_len, - data, &olen ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_crypt", ret ); - return( ret ); - } - - if( rec->data_len != olen ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - } - else -#endif /* MBEDTLS_ARC4_C || MBEDTLS_CIPHER_NULL_CIPHER */ -#if defined(MBEDTLS_GCM_C) || \ - defined(MBEDTLS_CCM_C) || \ - defined(MBEDTLS_CHACHAPOLY_C) - if( mode == MBEDTLS_MODE_GCM || - mode == MBEDTLS_MODE_CCM || - mode == MBEDTLS_MODE_CHACHAPOLY ) - { - unsigned char iv[12]; - size_t explicit_iv_len = transform->ivlen - transform->fixed_ivlen; - - /* - * Prepare IV from explicit and implicit data. - */ - - /* Check that there's enough space for the explicit IV - * (at the beginning of the record) and the MAC (at the - * end of the record). */ - if( rec->data_len < explicit_iv_len + transform->taglen ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "msglen (%d) < explicit_iv_len (%d) " - "+ taglen (%d)", rec->data_len, - explicit_iv_len, transform->taglen ) ); - return( MBEDTLS_ERR_SSL_INVALID_MAC ); - } - -#if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CCM_C) - if( transform->ivlen == 12 && transform->fixed_ivlen == 4 ) - { - /* GCM and CCM: fixed || explicit */ - - /* Fixed */ - memcpy( iv, transform->iv_dec, transform->fixed_ivlen ); - /* Explicit */ - memcpy( iv + transform->fixed_ivlen, data, 8 ); - } - else -#endif /* MBEDTLS_GCM_C || MBEDTLS_CCM_C */ -#if defined(MBEDTLS_CHACHAPOLY_C) - if( transform->ivlen == 12 && transform->fixed_ivlen == 12 ) - { - /* ChachaPoly: fixed XOR sequence number */ - unsigned char i; - - memcpy( iv, transform->iv_dec, transform->fixed_ivlen ); - - for( i = 0; i < 8; i++ ) - iv[i+4] ^= rec->ctr[i]; - } - else -#endif /* MBEDTLS_CHACHAPOLY_C */ - { - /* Reminder if we ever add an AEAD mode with a different size */ - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - - /* Group changes to data, data_len, and add_data, because - * add_data depends on data_len. */ - data += explicit_iv_len; - rec->data_offset += explicit_iv_len; - rec->data_len -= explicit_iv_len + transform->taglen; - - ssl_extract_add_data_from_record( add_data, &add_data_len, rec ); - MBEDTLS_SSL_DEBUG_BUF( 4, "additional data used for AEAD", - add_data, add_data_len ); - - /* Because of the check above, we know that there are - * explicit_iv_len Bytes preceeding data, and taglen - * bytes following data + data_len. This justifies - * the debug message and the invocation of - * mbedtls_cipher_auth_decrypt() below. */ - - MBEDTLS_SSL_DEBUG_BUF( 4, "IV used", iv, transform->ivlen ); - MBEDTLS_SSL_DEBUG_BUF( 4, "TAG used", data + rec->data_len, - transform->taglen ); - - /* - * Decrypt and authenticate - */ - if( ( ret = mbedtls_cipher_auth_decrypt( &transform->cipher_ctx_dec, - iv, transform->ivlen, - add_data, add_data_len, - data, rec->data_len, - data, &olen, - data + rec->data_len, - transform->taglen ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_auth_decrypt", ret ); - - if( ret == MBEDTLS_ERR_CIPHER_AUTH_FAILED ) - return( MBEDTLS_ERR_SSL_INVALID_MAC ); - - return( ret ); - } - auth_done++; - - /* Double-check that AEAD decryption doesn't change content length. */ - if( olen != rec->data_len ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - } - else -#endif /* MBEDTLS_GCM_C || MBEDTLS_CCM_C */ -#if defined(MBEDTLS_CIPHER_MODE_CBC) && \ - ( defined(MBEDTLS_AES_C) || defined(MBEDTLS_CAMELLIA_C) || defined(MBEDTLS_ARIA_C) ) - if( mode == MBEDTLS_MODE_CBC ) - { - size_t minlen = 0; - - /* - * Check immediate ciphertext sanity - */ -#if defined(MBEDTLS_SSL_PROTO_TLS1_1) || defined(MBEDTLS_SSL_PROTO_TLS1_2) - if( transform->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_2 ) - { - /* The ciphertext is prefixed with the CBC IV. */ - minlen += transform->ivlen; - } -#endif - - /* Size considerations: - * - * - The CBC cipher text must not be empty and hence - * at least of size transform->ivlen. - * - * Together with the potential IV-prefix, this explains - * the first of the two checks below. - * - * - The record must contain a MAC, either in plain or - * encrypted, depending on whether Encrypt-then-MAC - * is used or not. - * - If it is, the message contains the IV-prefix, - * the CBC ciphertext, and the MAC. - * - If it is not, the padded plaintext, and hence - * the CBC ciphertext, has at least length maclen + 1 - * because there is at least the padding length byte. - * - * As the CBC ciphertext is not empty, both cases give the - * lower bound minlen + maclen + 1 on the record size, which - * we test for in the second check below. - */ - if( rec->data_len < minlen + transform->ivlen || - rec->data_len < minlen + transform->maclen + 1 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "msglen (%d) < max( ivlen(%d), maclen (%d) " - "+ 1 ) ( + expl IV )", rec->data_len, - transform->ivlen, - transform->maclen ) ); - return( MBEDTLS_ERR_SSL_INVALID_MAC ); - } - - /* - * Authenticate before decrypt if enabled - */ -#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) - if( transform->encrypt_then_mac == MBEDTLS_SSL_ETM_ENABLED ) - { - unsigned char mac_expect[MBEDTLS_SSL_MAC_ADD]; - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "using encrypt then mac" ) ); - - /* Update data_len in tandem with add_data. - * - * The subtraction is safe because of the previous check - * data_len >= minlen + maclen + 1. - * - * Afterwards, we know that data + data_len is followed by at - * least maclen Bytes, which justifies the call to - * mbedtls_ssl_safer_memcmp() below. - * - * Further, we still know that data_len > minlen */ - rec->data_len -= transform->maclen; - ssl_extract_add_data_from_record( add_data, &add_data_len, rec ); - - /* Calculate expected MAC. */ - MBEDTLS_SSL_DEBUG_BUF( 4, "MAC'd meta-data", add_data, - add_data_len ); - mbedtls_md_hmac_update( &transform->md_ctx_dec, add_data, - add_data_len ); - mbedtls_md_hmac_update( &transform->md_ctx_dec, - data, rec->data_len ); - mbedtls_md_hmac_finish( &transform->md_ctx_dec, mac_expect ); - mbedtls_md_hmac_reset( &transform->md_ctx_dec ); - - MBEDTLS_SSL_DEBUG_BUF( 4, "message mac", data + rec->data_len, - transform->maclen ); - MBEDTLS_SSL_DEBUG_BUF( 4, "expected mac", mac_expect, - transform->maclen ); - - /* Compare expected MAC with MAC at the end of the record. */ - if( mbedtls_ssl_safer_memcmp( data + rec->data_len, mac_expect, - transform->maclen ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "message mac does not match" ) ); - return( MBEDTLS_ERR_SSL_INVALID_MAC ); - } - auth_done++; - } -#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */ - - /* - * Check length sanity - */ - - /* We know from above that data_len > minlen >= 0, - * so the following check in particular implies that - * data_len >= minlen + ivlen ( = minlen or 2 * minlen ). */ - if( rec->data_len % transform->ivlen != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "msglen (%d) %% ivlen (%d) != 0", - rec->data_len, transform->ivlen ) ); - return( MBEDTLS_ERR_SSL_INVALID_MAC ); - } - -#if defined(MBEDTLS_SSL_PROTO_TLS1_1) || defined(MBEDTLS_SSL_PROTO_TLS1_2) - /* - * Initialize for prepended IV for block cipher in TLS v1.1 and up - */ - if( transform->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_2 ) - { - /* Safe because data_len >= minlen + ivlen = 2 * ivlen. */ - memcpy( transform->iv_dec, data, transform->ivlen ); - - data += transform->ivlen; - rec->data_offset += transform->ivlen; - rec->data_len -= transform->ivlen; - } -#endif /* MBEDTLS_SSL_PROTO_TLS1_1 || MBEDTLS_SSL_PROTO_TLS1_2 */ - - /* We still have data_len % ivlen == 0 and data_len >= ivlen here. */ - - if( ( ret = mbedtls_cipher_crypt( &transform->cipher_ctx_dec, - transform->iv_dec, transform->ivlen, - data, rec->data_len, data, &olen ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_crypt", ret ); - return( ret ); - } - - /* Double-check that length hasn't changed during decryption. */ - if( rec->data_len != olen ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - -#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) - if( transform->minor_ver < MBEDTLS_SSL_MINOR_VERSION_2 ) - { - /* - * Save IV in SSL3 and TLS1, where CBC decryption of consecutive - * records is equivalent to CBC decryption of the concatenation - * of the records; in other words, IVs are maintained across - * record decryptions. - */ - memcpy( transform->iv_dec, transform->cipher_ctx_dec.iv, - transform->ivlen ); - } -#endif - - /* Safe since data_len >= minlen + maclen + 1, so after having - * subtracted at most minlen and maclen up to this point, - * data_len > 0 (because of data_len % ivlen == 0, it's actually - * >= ivlen ). */ - padlen = data[rec->data_len - 1]; - - if( auth_done == 1 ) - { - correct *= ( rec->data_len >= padlen + 1 ); - padlen *= ( rec->data_len >= padlen + 1 ); - } - else - { -#if defined(MBEDTLS_SSL_DEBUG_ALL) - if( rec->data_len < transform->maclen + padlen + 1 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "msglen (%d) < maclen (%d) + padlen (%d)", - rec->data_len, - transform->maclen, - padlen + 1 ) ); - } -#endif - - correct *= ( rec->data_len >= transform->maclen + padlen + 1 ); - padlen *= ( rec->data_len >= transform->maclen + padlen + 1 ); - } - - padlen++; - - /* Regardless of the validity of the padding, - * we have data_len >= padlen here. */ - -#if defined(MBEDTLS_SSL_PROTO_SSL3) - if( transform->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) - { - if( padlen > transform->ivlen ) - { -#if defined(MBEDTLS_SSL_DEBUG_ALL) - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad padding length: is %d, " - "should be no more than %d", - padlen, transform->ivlen ) ); -#endif - correct = 0; - } - } - else -#endif /* MBEDTLS_SSL_PROTO_SSL3 */ -#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \ - defined(MBEDTLS_SSL_PROTO_TLS1_2) - if( transform->minor_ver > MBEDTLS_SSL_MINOR_VERSION_0 ) - { - /* The padding check involves a series of up to 256 - * consecutive memory reads at the end of the record - * plaintext buffer. In order to hide the length and - * validity of the padding, always perform exactly - * `min(256,plaintext_len)` reads (but take into account - * only the last `padlen` bytes for the padding check). */ - size_t pad_count = 0; - size_t real_count = 0; - volatile unsigned char* const check = data; - - /* Index of first padding byte; it has been ensured above - * that the subtraction is safe. */ - size_t const padding_idx = rec->data_len - padlen; - size_t const num_checks = rec->data_len <= 256 ? rec->data_len : 256; - size_t const start_idx = rec->data_len - num_checks; - size_t idx; - - for( idx = start_idx; idx < rec->data_len; idx++ ) - { - real_count |= ( idx >= padding_idx ); - pad_count += real_count * ( check[idx] == padlen - 1 ); - } - correct &= ( pad_count == padlen ); - -#if defined(MBEDTLS_SSL_DEBUG_ALL) - if( padlen > 0 && correct == 0 ) - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad padding byte detected" ) ); -#endif - padlen &= correct * 0x1FF; - } - else -#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 || \ - MBEDTLS_SSL_PROTO_TLS1_2 */ - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - - /* If the padding was found to be invalid, padlen == 0 - * and the subtraction is safe. If the padding was found valid, - * padlen hasn't been changed and the previous assertion - * data_len >= padlen still holds. */ - rec->data_len -= padlen; - } - else -#endif /* MBEDTLS_CIPHER_MODE_CBC && - ( MBEDTLS_AES_C || MBEDTLS_CAMELLIA_C || MBEDTLS_ARIA_C ) */ - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - -#if defined(MBEDTLS_SSL_DEBUG_ALL) - MBEDTLS_SSL_DEBUG_BUF( 4, "raw buffer after decryption", - data, rec->data_len ); -#endif - - /* - * Authenticate if not done yet. - * Compute the MAC regardless of the padding result (RFC4346, CBCTIME). - */ -#if defined(MBEDTLS_SSL_SOME_MODES_USE_MAC) - if( auth_done == 0 ) - { - unsigned char mac_expect[MBEDTLS_SSL_MAC_ADD]; - - /* If the initial value of padlen was such that - * data_len < maclen + padlen + 1, then padlen - * got reset to 1, and the initial check - * data_len >= minlen + maclen + 1 - * guarantees that at this point we still - * have at least data_len >= maclen. - * - * If the initial value of padlen was such that - * data_len >= maclen + padlen + 1, then we have - * subtracted either padlen + 1 (if the padding was correct) - * or 0 (if the padding was incorrect) since then, - * hence data_len >= maclen in any case. - */ - rec->data_len -= transform->maclen; - ssl_extract_add_data_from_record( add_data, &add_data_len, rec ); - -#if defined(MBEDTLS_SSL_PROTO_SSL3) - if( transform->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) - { - ssl_mac( &transform->md_ctx_dec, - transform->mac_dec, - data, rec->data_len, - rec->ctr, rec->type, - mac_expect ); - } - else -#endif /* MBEDTLS_SSL_PROTO_SSL3 */ -#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \ - defined(MBEDTLS_SSL_PROTO_TLS1_2) - if( transform->minor_ver > MBEDTLS_SSL_MINOR_VERSION_0 ) - { - /* - * Process MAC and always update for padlen afterwards to make - * total time independent of padlen. - * - * Known timing attacks: - * - Lucky Thirteen (http://www.isg.rhul.ac.uk/tls/TLStiming.pdf) - * - * To compensate for different timings for the MAC calculation - * depending on how much padding was removed (which is determined - * by padlen), process extra_run more blocks through the hash - * function. - * - * The formula in the paper is - * extra_run = ceil( (L1-55) / 64 ) - ceil( (L2-55) / 64 ) - * where L1 is the size of the header plus the decrypted message - * plus CBC padding and L2 is the size of the header plus the - * decrypted message. This is for an underlying hash function - * with 64-byte blocks. - * We use ( (Lx+8) / 64 ) to handle 'negative Lx' values - * correctly. We round down instead of up, so -56 is the correct - * value for our calculations instead of -55. - * - * Repeat the formula rather than defining a block_size variable. - * This avoids requiring division by a variable at runtime - * (which would be marginally less efficient and would require - * linking an extra division function in some builds). - */ - size_t j, extra_run = 0; - unsigned char tmp[MBEDTLS_MD_MAX_BLOCK_SIZE]; - - /* - * The next two sizes are the minimum and maximum values of - * in_msglen over all padlen values. - * - * They're independent of padlen, since we previously did - * data_len -= padlen. - * - * Note that max_len + maclen is never more than the buffer - * length, as we previously did in_msglen -= maclen too. - */ - const size_t max_len = rec->data_len + padlen; - const size_t min_len = ( max_len > 256 ) ? max_len - 256 : 0; - - memset( tmp, 0, sizeof( tmp ) ); - - switch( mbedtls_md_get_type( transform->md_ctx_dec.md_info ) ) - { -#if defined(MBEDTLS_MD5_C) || defined(MBEDTLS_SHA1_C) || \ - defined(MBEDTLS_SHA256_C) - case MBEDTLS_MD_MD5: - case MBEDTLS_MD_SHA1: - case MBEDTLS_MD_SHA256: - /* 8 bytes of message size, 64-byte compression blocks */ - extra_run = - ( add_data_len + rec->data_len + padlen + 8 ) / 64 - - ( add_data_len + rec->data_len + 8 ) / 64; - break; -#endif -#if defined(MBEDTLS_SHA512_C) - case MBEDTLS_MD_SHA384: - /* 16 bytes of message size, 128-byte compression blocks */ - extra_run = - ( add_data_len + rec->data_len + padlen + 16 ) / 128 - - ( add_data_len + rec->data_len + 16 ) / 128; - break; -#endif - default: - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - - extra_run &= correct * 0xFF; - - mbedtls_md_hmac_update( &transform->md_ctx_dec, add_data, - add_data_len ); - mbedtls_md_hmac_update( &transform->md_ctx_dec, data, - rec->data_len ); - /* Make sure we access everything even when padlen > 0. This - * makes the synchronisation requirements for just-in-time - * Prime+Probe attacks much tighter and hopefully impractical. */ - ssl_read_memory( data + rec->data_len, padlen ); - mbedtls_md_hmac_finish( &transform->md_ctx_dec, mac_expect ); - - /* Call mbedtls_md_process at least once due to cache attacks - * that observe whether md_process() was called of not */ - for( j = 0; j < extra_run + 1; j++ ) - mbedtls_md_process( &transform->md_ctx_dec, tmp ); - - mbedtls_md_hmac_reset( &transform->md_ctx_dec ); - - /* Make sure we access all the memory that could contain the MAC, - * before we check it in the next code block. This makes the - * synchronisation requirements for just-in-time Prime+Probe - * attacks much tighter and hopefully impractical. */ - ssl_read_memory( data + min_len, - max_len - min_len + transform->maclen ); - } - else -#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 || \ - MBEDTLS_SSL_PROTO_TLS1_2 */ - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - -#if defined(MBEDTLS_SSL_DEBUG_ALL) - MBEDTLS_SSL_DEBUG_BUF( 4, "expected mac", mac_expect, transform->maclen ); - MBEDTLS_SSL_DEBUG_BUF( 4, "message mac", data + rec->data_len, transform->maclen ); -#endif - - if( mbedtls_ssl_safer_memcmp( data + rec->data_len, mac_expect, - transform->maclen ) != 0 ) - { -#if defined(MBEDTLS_SSL_DEBUG_ALL) - MBEDTLS_SSL_DEBUG_MSG( 1, ( "message mac does not match" ) ); -#endif - correct = 0; - } - auth_done++; - } - - /* - * Finally check the correct flag - */ - if( correct == 0 ) - return( MBEDTLS_ERR_SSL_INVALID_MAC ); -#endif /* MBEDTLS_SSL_SOME_MODES_USE_MAC */ - - /* Make extra sure authentication was performed, exactly once */ - if( auth_done != 1 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - -#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) - if( rec->cid_len != 0 ) - { - ret = ssl_cid_parse_inner_plaintext( data, &rec->data_len, - &rec->type ); - if( ret != 0 ) - return( MBEDTLS_ERR_SSL_INVALID_RECORD ); - } -#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= decrypt buf" ) ); - - return( 0 ); -} - -#undef MAC_NONE -#undef MAC_PLAINTEXT -#undef MAC_CIPHERTEXT - -#if defined(MBEDTLS_ZLIB_SUPPORT) -/* - * Compression/decompression functions - */ -static int ssl_compress_buf( mbedtls_ssl_context *ssl ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - unsigned char *msg_post = ssl->out_msg; - ptrdiff_t bytes_written = ssl->out_msg - ssl->out_buf; - size_t len_pre = ssl->out_msglen; - unsigned char *msg_pre = ssl->compress_buf; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> compress buf" ) ); - - if( len_pre == 0 ) - return( 0 ); - - memcpy( msg_pre, ssl->out_msg, len_pre ); - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "before compression: msglen = %d, ", - ssl->out_msglen ) ); - - MBEDTLS_SSL_DEBUG_BUF( 4, "before compression: output payload", - ssl->out_msg, ssl->out_msglen ); - - ssl->transform_out->ctx_deflate.next_in = msg_pre; - ssl->transform_out->ctx_deflate.avail_in = len_pre; - ssl->transform_out->ctx_deflate.next_out = msg_post; - ssl->transform_out->ctx_deflate.avail_out = MBEDTLS_SSL_OUT_BUFFER_LEN - bytes_written; - - ret = deflate( &ssl->transform_out->ctx_deflate, Z_SYNC_FLUSH ); - if( ret != Z_OK ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "failed to perform compression (%d)", ret ) ); - return( MBEDTLS_ERR_SSL_COMPRESSION_FAILED ); - } - - ssl->out_msglen = MBEDTLS_SSL_OUT_BUFFER_LEN - - ssl->transform_out->ctx_deflate.avail_out - bytes_written; - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "after compression: msglen = %d, ", - ssl->out_msglen ) ); - - MBEDTLS_SSL_DEBUG_BUF( 4, "after compression: output payload", - ssl->out_msg, ssl->out_msglen ); - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= compress buf" ) ); - - return( 0 ); -} - -static int ssl_decompress_buf( mbedtls_ssl_context *ssl ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - unsigned char *msg_post = ssl->in_msg; - ptrdiff_t header_bytes = ssl->in_msg - ssl->in_buf; - size_t len_pre = ssl->in_msglen; - unsigned char *msg_pre = ssl->compress_buf; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> decompress buf" ) ); - - if( len_pre == 0 ) - return( 0 ); - - memcpy( msg_pre, ssl->in_msg, len_pre ); - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "before decompression: msglen = %d, ", - ssl->in_msglen ) ); - - MBEDTLS_SSL_DEBUG_BUF( 4, "before decompression: input payload", - ssl->in_msg, ssl->in_msglen ); - - ssl->transform_in->ctx_inflate.next_in = msg_pre; - ssl->transform_in->ctx_inflate.avail_in = len_pre; - ssl->transform_in->ctx_inflate.next_out = msg_post; - ssl->transform_in->ctx_inflate.avail_out = MBEDTLS_SSL_IN_BUFFER_LEN - - header_bytes; - - ret = inflate( &ssl->transform_in->ctx_inflate, Z_SYNC_FLUSH ); - if( ret != Z_OK ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "failed to perform decompression (%d)", ret ) ); - return( MBEDTLS_ERR_SSL_COMPRESSION_FAILED ); - } - - ssl->in_msglen = MBEDTLS_SSL_IN_BUFFER_LEN - - ssl->transform_in->ctx_inflate.avail_out - header_bytes; - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "after decompression: msglen = %d, ", - ssl->in_msglen ) ); - - MBEDTLS_SSL_DEBUG_BUF( 4, "after decompression: input payload", - ssl->in_msg, ssl->in_msglen ); - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= decompress buf" ) ); - - return( 0 ); -} -#endif /* MBEDTLS_ZLIB_SUPPORT */ - #if defined(MBEDTLS_SSL_SRV_C) && defined(MBEDTLS_SSL_RENEGOTIATION) static int ssl_write_hello_request( mbedtls_ssl_context *ssl ); @@ -3569,3058 +2019,6 @@ int mbedtls_ssl_resend_hello_request( mbedtls_ssl_context *ssl ) #endif #endif /* MBEDTLS_SSL_SRV_C && MBEDTLS_SSL_RENEGOTIATION */ -/* - * Fill the input message buffer by appending data to it. - * The amount of data already fetched is in ssl->in_left. - * - * If we return 0, is it guaranteed that (at least) nb_want bytes are - * available (from this read and/or a previous one). Otherwise, an error code - * is returned (possibly EOF or WANT_READ). - * - * With stream transport (TLS) on success ssl->in_left == nb_want, but - * with datagram transport (DTLS) on success ssl->in_left >= nb_want, - * since we always read a whole datagram at once. - * - * For DTLS, it is up to the caller to set ssl->next_record_offset when - * they're done reading a record. - */ -int mbedtls_ssl_fetch_input( mbedtls_ssl_context *ssl, size_t nb_want ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - size_t len; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> fetch input" ) ); - - if( ssl->f_recv == NULL && ssl->f_recv_timeout == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "Bad usage of mbedtls_ssl_set_bio() " - "or mbedtls_ssl_set_bio()" ) ); - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - - if( nb_want > MBEDTLS_SSL_IN_BUFFER_LEN - (size_t)( ssl->in_hdr - ssl->in_buf ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "requesting more data than fits" ) ); - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - { - uint32_t timeout; - - /* Just to be sure */ - if( ssl->f_set_timer == NULL || ssl->f_get_timer == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "You must use " - "mbedtls_ssl_set_timer_cb() for DTLS" ) ); - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - - /* - * The point is, we need to always read a full datagram at once, so we - * sometimes read more then requested, and handle the additional data. - * It could be the rest of the current record (while fetching the - * header) and/or some other records in the same datagram. - */ - - /* - * Move to the next record in the already read datagram if applicable - */ - if( ssl->next_record_offset != 0 ) - { - if( ssl->in_left < ssl->next_record_offset ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - - ssl->in_left -= ssl->next_record_offset; - - if( ssl->in_left != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "next record in same datagram, offset: %d", - ssl->next_record_offset ) ); - memmove( ssl->in_hdr, - ssl->in_hdr + ssl->next_record_offset, - ssl->in_left ); - } - - ssl->next_record_offset = 0; - } - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "in_left: %d, nb_want: %d", - ssl->in_left, nb_want ) ); - - /* - * Done if we already have enough data. - */ - if( nb_want <= ssl->in_left) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= fetch input" ) ); - return( 0 ); - } - - /* - * A record can't be split across datagrams. If we need to read but - * are not at the beginning of a new record, the caller did something - * wrong. - */ - if( ssl->in_left != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - - /* - * Don't even try to read if time's out already. - * This avoids by-passing the timer when repeatedly receiving messages - * that will end up being dropped. - */ - if( mbedtls_ssl_check_timer( ssl ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "timer has expired" ) ); - ret = MBEDTLS_ERR_SSL_TIMEOUT; - } - else - { - len = MBEDTLS_SSL_IN_BUFFER_LEN - ( ssl->in_hdr - ssl->in_buf ); - - if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER ) - timeout = ssl->handshake->retransmit_timeout; - else - timeout = ssl->conf->read_timeout; - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "f_recv_timeout: %u ms", timeout ) ); - - if( ssl->f_recv_timeout != NULL ) - ret = ssl->f_recv_timeout( ssl->p_bio, ssl->in_hdr, len, - timeout ); - else - ret = ssl->f_recv( ssl->p_bio, ssl->in_hdr, len ); - - MBEDTLS_SSL_DEBUG_RET( 2, "ssl->f_recv(_timeout)", ret ); - - if( ret == 0 ) - return( MBEDTLS_ERR_SSL_CONN_EOF ); - } - - if( ret == MBEDTLS_ERR_SSL_TIMEOUT ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "timeout" ) ); - mbedtls_ssl_set_timer( ssl, 0 ); - - if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER ) - { - if( ssl_double_retransmit_timeout( ssl ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "handshake timeout" ) ); - return( MBEDTLS_ERR_SSL_TIMEOUT ); - } - - if( ( ret = mbedtls_ssl_resend( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_resend", ret ); - return( ret ); - } - - return( MBEDTLS_ERR_SSL_WANT_READ ); - } -#if defined(MBEDTLS_SSL_SRV_C) && defined(MBEDTLS_SSL_RENEGOTIATION) - else if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER && - ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_PENDING ) - { - if( ( ret = mbedtls_ssl_resend_hello_request( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_resend_hello_request", - ret ); - return( ret ); - } - - return( MBEDTLS_ERR_SSL_WANT_READ ); - } -#endif /* MBEDTLS_SSL_SRV_C && MBEDTLS_SSL_RENEGOTIATION */ - } - - if( ret < 0 ) - return( ret ); - - ssl->in_left = ret; - } - else -#endif - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "in_left: %d, nb_want: %d", - ssl->in_left, nb_want ) ); - - while( ssl->in_left < nb_want ) - { - len = nb_want - ssl->in_left; - - if( mbedtls_ssl_check_timer( ssl ) != 0 ) - ret = MBEDTLS_ERR_SSL_TIMEOUT; - else - { - if( ssl->f_recv_timeout != NULL ) - { - ret = ssl->f_recv_timeout( ssl->p_bio, - ssl->in_hdr + ssl->in_left, len, - ssl->conf->read_timeout ); - } - else - { - ret = ssl->f_recv( ssl->p_bio, - ssl->in_hdr + ssl->in_left, len ); - } - } - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "in_left: %d, nb_want: %d", - ssl->in_left, nb_want ) ); - MBEDTLS_SSL_DEBUG_RET( 2, "ssl->f_recv(_timeout)", ret ); - - if( ret == 0 ) - return( MBEDTLS_ERR_SSL_CONN_EOF ); - - if( ret < 0 ) - return( ret ); - - if ( (size_t)ret > len || ( INT_MAX > SIZE_MAX && ret > SIZE_MAX ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, - ( "f_recv returned %d bytes but only %lu were requested", - ret, (unsigned long)len ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - - ssl->in_left += ret; - } - } - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= fetch input" ) ); - - return( 0 ); -} - -/* - * Flush any data not yet written - */ -int mbedtls_ssl_flush_output( mbedtls_ssl_context *ssl ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - unsigned char *buf; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> flush output" ) ); - - if( ssl->f_send == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "Bad usage of mbedtls_ssl_set_bio() " - "or mbedtls_ssl_set_bio()" ) ); - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - - /* Avoid incrementing counter if data is flushed */ - if( ssl->out_left == 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= flush output" ) ); - return( 0 ); - } - - while( ssl->out_left > 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "message length: %d, out_left: %d", - mbedtls_ssl_out_hdr_len( ssl ) + ssl->out_msglen, ssl->out_left ) ); - - buf = ssl->out_hdr - ssl->out_left; - ret = ssl->f_send( ssl->p_bio, buf, ssl->out_left ); - - MBEDTLS_SSL_DEBUG_RET( 2, "ssl->f_send", ret ); - - if( ret <= 0 ) - return( ret ); - - if( (size_t)ret > ssl->out_left || ( INT_MAX > SIZE_MAX && ret > SIZE_MAX ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, - ( "f_send returned %d bytes but only %lu bytes were sent", - ret, (unsigned long)ssl->out_left ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - - ssl->out_left -= ret; - } - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - { - ssl->out_hdr = ssl->out_buf; - } - else -#endif - { - ssl->out_hdr = ssl->out_buf + 8; - } - mbedtls_ssl_update_out_pointers( ssl, ssl->transform_out ); - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= flush output" ) ); - - return( 0 ); -} - -/* - * Functions to handle the DTLS retransmission state machine - */ -#if defined(MBEDTLS_SSL_PROTO_DTLS) -/* - * Append current handshake message to current outgoing flight - */ -static int ssl_flight_append( mbedtls_ssl_context *ssl ) -{ - mbedtls_ssl_flight_item *msg; - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> ssl_flight_append" ) ); - MBEDTLS_SSL_DEBUG_BUF( 4, "message appended to flight", - ssl->out_msg, ssl->out_msglen ); - - /* Allocate space for current message */ - if( ( msg = mbedtls_calloc( 1, sizeof( mbedtls_ssl_flight_item ) ) ) == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc %d bytes failed", - sizeof( mbedtls_ssl_flight_item ) ) ); - return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); - } - - if( ( msg->p = mbedtls_calloc( 1, ssl->out_msglen ) ) == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc %d bytes failed", ssl->out_msglen ) ); - mbedtls_free( msg ); - return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); - } - - /* Copy current handshake message with headers */ - memcpy( msg->p, ssl->out_msg, ssl->out_msglen ); - msg->len = ssl->out_msglen; - msg->type = ssl->out_msgtype; - msg->next = NULL; - - /* Append to the current flight */ - if( ssl->handshake->flight == NULL ) - ssl->handshake->flight = msg; - else - { - mbedtls_ssl_flight_item *cur = ssl->handshake->flight; - while( cur->next != NULL ) - cur = cur->next; - cur->next = msg; - } - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= ssl_flight_append" ) ); - return( 0 ); -} - -/* - * Free the current flight of handshake messages - */ -void mbedtls_ssl_flight_free( mbedtls_ssl_flight_item *flight ) -{ - mbedtls_ssl_flight_item *cur = flight; - mbedtls_ssl_flight_item *next; - - while( cur != NULL ) - { - next = cur->next; - - mbedtls_free( cur->p ); - mbedtls_free( cur ); - - cur = next; - } -} - -/* - * Swap transform_out and out_ctr with the alternative ones - */ -static void ssl_swap_epochs( mbedtls_ssl_context *ssl ) -{ - mbedtls_ssl_transform *tmp_transform; - unsigned char tmp_out_ctr[8]; - - if( ssl->transform_out == ssl->handshake->alt_transform_out ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "skip swap epochs" ) ); - return; - } - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "swap epochs" ) ); - - /* Swap transforms */ - tmp_transform = ssl->transform_out; - ssl->transform_out = ssl->handshake->alt_transform_out; - ssl->handshake->alt_transform_out = tmp_transform; - - /* Swap epoch + sequence_number */ - memcpy( tmp_out_ctr, ssl->cur_out_ctr, 8 ); - memcpy( ssl->cur_out_ctr, ssl->handshake->alt_out_ctr, 8 ); - memcpy( ssl->handshake->alt_out_ctr, tmp_out_ctr, 8 ); - - /* Adjust to the newly activated transform */ - mbedtls_ssl_update_out_pointers( ssl, ssl->transform_out ); - -#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL) - if( mbedtls_ssl_hw_record_activate != NULL ) - { - if( ( ret = mbedtls_ssl_hw_record_activate( ssl, MBEDTLS_SSL_CHANNEL_OUTBOUND ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_activate", ret ); - return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED ); - } - } -#endif -} - -/* - * Retransmit the current flight of messages. - */ -int mbedtls_ssl_resend( mbedtls_ssl_context *ssl ) -{ - int ret = 0; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> mbedtls_ssl_resend" ) ); - - ret = mbedtls_ssl_flight_transmit( ssl ); - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= mbedtls_ssl_resend" ) ); - - return( ret ); -} - -/* - * Transmit or retransmit the current flight of messages. - * - * Need to remember the current message in case flush_output returns - * WANT_WRITE, causing us to exit this function and come back later. - * This function must be called until state is no longer SENDING. - */ -int mbedtls_ssl_flight_transmit( mbedtls_ssl_context *ssl ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> mbedtls_ssl_flight_transmit" ) ); - - if( ssl->handshake->retransmit_state != MBEDTLS_SSL_RETRANS_SENDING ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "initialise flight transmission" ) ); - - ssl->handshake->cur_msg = ssl->handshake->flight; - ssl->handshake->cur_msg_p = ssl->handshake->flight->p + 12; - ssl_swap_epochs( ssl ); - - ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_SENDING; - } - - while( ssl->handshake->cur_msg != NULL ) - { - size_t max_frag_len; - const mbedtls_ssl_flight_item * const cur = ssl->handshake->cur_msg; - - int const is_finished = - ( cur->type == MBEDTLS_SSL_MSG_HANDSHAKE && - cur->p[0] == MBEDTLS_SSL_HS_FINISHED ); - - uint8_t const force_flush = ssl->disable_datagram_packing == 1 ? - SSL_FORCE_FLUSH : SSL_DONT_FORCE_FLUSH; - - /* Swap epochs before sending Finished: we can't do it after - * sending ChangeCipherSpec, in case write returns WANT_READ. - * Must be done before copying, may change out_msg pointer */ - if( is_finished && ssl->handshake->cur_msg_p == ( cur->p + 12 ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "swap epochs to send finished message" ) ); - ssl_swap_epochs( ssl ); - } - - ret = ssl_get_remaining_payload_in_datagram( ssl ); - if( ret < 0 ) - return( ret ); - max_frag_len = (size_t) ret; - - /* CCS is copied as is, while HS messages may need fragmentation */ - if( cur->type == MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC ) - { - if( max_frag_len == 0 ) - { - if( ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 ) - return( ret ); - - continue; - } - - memcpy( ssl->out_msg, cur->p, cur->len ); - ssl->out_msglen = cur->len; - ssl->out_msgtype = cur->type; - - /* Update position inside current message */ - ssl->handshake->cur_msg_p += cur->len; - } - else - { - const unsigned char * const p = ssl->handshake->cur_msg_p; - const size_t hs_len = cur->len - 12; - const size_t frag_off = p - ( cur->p + 12 ); - const size_t rem_len = hs_len - frag_off; - size_t cur_hs_frag_len, max_hs_frag_len; - - if( ( max_frag_len < 12 ) || ( max_frag_len == 12 && hs_len != 0 ) ) - { - if( is_finished ) - ssl_swap_epochs( ssl ); - - if( ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 ) - return( ret ); - - continue; - } - max_hs_frag_len = max_frag_len - 12; - - cur_hs_frag_len = rem_len > max_hs_frag_len ? - max_hs_frag_len : rem_len; - - if( frag_off == 0 && cur_hs_frag_len != hs_len ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "fragmenting handshake message (%u > %u)", - (unsigned) cur_hs_frag_len, - (unsigned) max_hs_frag_len ) ); - } - - /* Messages are stored with handshake headers as if not fragmented, - * copy beginning of headers then fill fragmentation fields. - * Handshake headers: type(1) len(3) seq(2) f_off(3) f_len(3) */ - memcpy( ssl->out_msg, cur->p, 6 ); - - ssl->out_msg[6] = ( ( frag_off >> 16 ) & 0xff ); - ssl->out_msg[7] = ( ( frag_off >> 8 ) & 0xff ); - ssl->out_msg[8] = ( ( frag_off ) & 0xff ); - - ssl->out_msg[ 9] = ( ( cur_hs_frag_len >> 16 ) & 0xff ); - ssl->out_msg[10] = ( ( cur_hs_frag_len >> 8 ) & 0xff ); - ssl->out_msg[11] = ( ( cur_hs_frag_len ) & 0xff ); - - MBEDTLS_SSL_DEBUG_BUF( 3, "handshake header", ssl->out_msg, 12 ); - - /* Copy the handshake message content and set records fields */ - memcpy( ssl->out_msg + 12, p, cur_hs_frag_len ); - ssl->out_msglen = cur_hs_frag_len + 12; - ssl->out_msgtype = cur->type; - - /* Update position inside current message */ - ssl->handshake->cur_msg_p += cur_hs_frag_len; - } - - /* If done with the current message move to the next one if any */ - if( ssl->handshake->cur_msg_p >= cur->p + cur->len ) - { - if( cur->next != NULL ) - { - ssl->handshake->cur_msg = cur->next; - ssl->handshake->cur_msg_p = cur->next->p + 12; - } - else - { - ssl->handshake->cur_msg = NULL; - ssl->handshake->cur_msg_p = NULL; - } - } - - /* Actually send the message out */ - if( ( ret = mbedtls_ssl_write_record( ssl, force_flush ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret ); - return( ret ); - } - } - - if( ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 ) - return( ret ); - - /* Update state and set timer */ - if( ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER ) - ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_FINISHED; - else - { - ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_WAITING; - mbedtls_ssl_set_timer( ssl, ssl->handshake->retransmit_timeout ); - } - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= mbedtls_ssl_flight_transmit" ) ); - - return( 0 ); -} - -/* - * To be called when the last message of an incoming flight is received. - */ -void mbedtls_ssl_recv_flight_completed( mbedtls_ssl_context *ssl ) -{ - /* We won't need to resend that one any more */ - mbedtls_ssl_flight_free( ssl->handshake->flight ); - ssl->handshake->flight = NULL; - ssl->handshake->cur_msg = NULL; - - /* The next incoming flight will start with this msg_seq */ - ssl->handshake->in_flight_start_seq = ssl->handshake->in_msg_seq; - - /* We don't want to remember CCS's across flight boundaries. */ - ssl->handshake->buffering.seen_ccs = 0; - - /* Clear future message buffering structure. */ - mbedtls_ssl_buffering_free( ssl ); - - /* Cancel timer */ - mbedtls_ssl_set_timer( ssl, 0 ); - - if( ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE && - ssl->in_msg[0] == MBEDTLS_SSL_HS_FINISHED ) - { - ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_FINISHED; - } - else - ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_PREPARING; -} - -/* - * To be called when the last message of an outgoing flight is send. - */ -void mbedtls_ssl_send_flight_completed( mbedtls_ssl_context *ssl ) -{ - ssl_reset_retransmit_timeout( ssl ); - mbedtls_ssl_set_timer( ssl, ssl->handshake->retransmit_timeout ); - - if( ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE && - ssl->in_msg[0] == MBEDTLS_SSL_HS_FINISHED ) - { - ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_FINISHED; - } - else - ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_WAITING; -} -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - -/* - * Handshake layer functions - */ - -/* - * Write (DTLS: or queue) current handshake (including CCS) message. - * - * - fill in handshake headers - * - update handshake checksum - * - DTLS: save message for resending - * - then pass to the record layer - * - * DTLS: except for HelloRequest, messages are only queued, and will only be - * actually sent when calling flight_transmit() or resend(). - * - * Inputs: - * - ssl->out_msglen: 4 + actual handshake message len - * (4 is the size of handshake headers for TLS) - * - ssl->out_msg[0]: the handshake type (ClientHello, ServerHello, etc) - * - ssl->out_msg + 4: the handshake message body - * - * Outputs, ie state before passing to flight_append() or write_record(): - * - ssl->out_msglen: the length of the record contents - * (including handshake headers but excluding record headers) - * - ssl->out_msg: the record contents (handshake headers + content) - */ -int mbedtls_ssl_write_handshake_msg( mbedtls_ssl_context *ssl ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - const size_t hs_len = ssl->out_msglen - 4; - const unsigned char hs_type = ssl->out_msg[0]; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write handshake message" ) ); - - /* - * Sanity checks - */ - if( ssl->out_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE && - ssl->out_msgtype != MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC ) - { - /* In SSLv3, the client might send a NoCertificate alert. */ -#if defined(MBEDTLS_SSL_PROTO_SSL3) && defined(MBEDTLS_SSL_CLI_C) - if( ! ( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 && - ssl->out_msgtype == MBEDTLS_SSL_MSG_ALERT && - ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT ) ) -#endif /* MBEDTLS_SSL_PROTO_SSL3 && MBEDTLS_SSL_SRV_C */ - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - } - - /* Whenever we send anything different from a - * HelloRequest we should be in a handshake - double check. */ - if( ! ( ssl->out_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE && - hs_type == MBEDTLS_SSL_HS_HELLO_REQUEST ) && - ssl->handshake == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && - ssl->handshake != NULL && - ssl->handshake->retransmit_state == MBEDTLS_SSL_RETRANS_SENDING ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } -#endif - - /* Double-check that we did not exceed the bounds - * of the outgoing record buffer. - * This should never fail as the various message - * writing functions must obey the bounds of the - * outgoing record buffer, but better be safe. - * - * Note: We deliberately do not check for the MTU or MFL here. - */ - if( ssl->out_msglen > MBEDTLS_SSL_OUT_CONTENT_LEN ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "Record too large: " - "size %u, maximum %u", - (unsigned) ssl->out_msglen, - (unsigned) MBEDTLS_SSL_OUT_CONTENT_LEN ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - - /* - * Fill handshake headers - */ - if( ssl->out_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE ) - { - ssl->out_msg[1] = (unsigned char)( hs_len >> 16 ); - ssl->out_msg[2] = (unsigned char)( hs_len >> 8 ); - ssl->out_msg[3] = (unsigned char)( hs_len ); - - /* - * DTLS has additional fields in the Handshake layer, - * between the length field and the actual payload: - * uint16 message_seq; - * uint24 fragment_offset; - * uint24 fragment_length; - */ -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - { - /* Make room for the additional DTLS fields */ - if( MBEDTLS_SSL_OUT_CONTENT_LEN - ssl->out_msglen < 8 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "DTLS handshake message too large: " - "size %u, maximum %u", - (unsigned) ( hs_len ), - (unsigned) ( MBEDTLS_SSL_OUT_CONTENT_LEN - 12 ) ) ); - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - - memmove( ssl->out_msg + 12, ssl->out_msg + 4, hs_len ); - ssl->out_msglen += 8; - - /* Write message_seq and update it, except for HelloRequest */ - if( hs_type != MBEDTLS_SSL_HS_HELLO_REQUEST ) - { - ssl->out_msg[4] = ( ssl->handshake->out_msg_seq >> 8 ) & 0xFF; - ssl->out_msg[5] = ( ssl->handshake->out_msg_seq ) & 0xFF; - ++( ssl->handshake->out_msg_seq ); - } - else - { - ssl->out_msg[4] = 0; - ssl->out_msg[5] = 0; - } - - /* Handshake hashes are computed without fragmentation, - * so set frag_offset = 0 and frag_len = hs_len for now */ - memset( ssl->out_msg + 6, 0x00, 3 ); - memcpy( ssl->out_msg + 9, ssl->out_msg + 1, 3 ); - } -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - - /* Update running hashes of handshake messages seen */ - if( hs_type != MBEDTLS_SSL_HS_HELLO_REQUEST ) - ssl->handshake->update_checksum( ssl, ssl->out_msg, ssl->out_msglen ); - } - - /* Either send now, or just save to be sent (and resent) later */ -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && - ! ( ssl->out_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE && - hs_type == MBEDTLS_SSL_HS_HELLO_REQUEST ) ) - { - if( ( ret = ssl_flight_append( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "ssl_flight_append", ret ); - return( ret ); - } - } - else -#endif - { - if( ( ret = mbedtls_ssl_write_record( ssl, SSL_FORCE_FLUSH ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "ssl_write_record", ret ); - return( ret ); - } - } - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write handshake message" ) ); - - return( 0 ); -} - -/* - * Record layer functions - */ - -/* - * Write current record. - * - * Uses: - * - ssl->out_msgtype: type of the message (AppData, Handshake, Alert, CCS) - * - ssl->out_msglen: length of the record content (excl headers) - * - ssl->out_msg: record content - */ -int mbedtls_ssl_write_record( mbedtls_ssl_context *ssl, uint8_t force_flush ) -{ - int ret, done = 0; - size_t len = ssl->out_msglen; - uint8_t flush = force_flush; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write record" ) ); - -#if defined(MBEDTLS_ZLIB_SUPPORT) - if( ssl->transform_out != NULL && - ssl->session_out->compression == MBEDTLS_SSL_COMPRESS_DEFLATE ) - { - if( ( ret = ssl_compress_buf( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "ssl_compress_buf", ret ); - return( ret ); - } - - len = ssl->out_msglen; - } -#endif /*MBEDTLS_ZLIB_SUPPORT */ - -#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL) - if( mbedtls_ssl_hw_record_write != NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "going for mbedtls_ssl_hw_record_write()" ) ); - - ret = mbedtls_ssl_hw_record_write( ssl ); - if( ret != 0 && ret != MBEDTLS_ERR_SSL_HW_ACCEL_FALLTHROUGH ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_write", ret ); - return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED ); - } - - if( ret == 0 ) - done = 1; - } -#endif /* MBEDTLS_SSL_HW_RECORD_ACCEL */ - if( !done ) - { - unsigned i; - size_t protected_record_size; - - /* Skip writing the record content type to after the encryption, - * as it may change when using the CID extension. */ - - mbedtls_ssl_write_version( ssl->major_ver, ssl->minor_ver, - ssl->conf->transport, ssl->out_hdr + 1 ); - - memcpy( ssl->out_ctr, ssl->cur_out_ctr, 8 ); - ssl->out_len[0] = (unsigned char)( len >> 8 ); - ssl->out_len[1] = (unsigned char)( len ); - - if( ssl->transform_out != NULL ) - { - mbedtls_record rec; - - rec.buf = ssl->out_iv; - rec.buf_len = MBEDTLS_SSL_OUT_BUFFER_LEN - - ( ssl->out_iv - ssl->out_buf ); - rec.data_len = ssl->out_msglen; - rec.data_offset = ssl->out_msg - rec.buf; - - memcpy( &rec.ctr[0], ssl->out_ctr, 8 ); - mbedtls_ssl_write_version( ssl->major_ver, ssl->minor_ver, - ssl->conf->transport, rec.ver ); - rec.type = ssl->out_msgtype; - -#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) - /* The CID is set by mbedtls_ssl_encrypt_buf(). */ - rec.cid_len = 0; -#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ - - if( ( ret = mbedtls_ssl_encrypt_buf( ssl, ssl->transform_out, &rec, - ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "ssl_encrypt_buf", ret ); - return( ret ); - } - - if( rec.data_offset != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - - /* Update the record content type and CID. */ - ssl->out_msgtype = rec.type; -#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID ) - memcpy( ssl->out_cid, rec.cid, rec.cid_len ); -#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ - ssl->out_msglen = len = rec.data_len; - ssl->out_len[0] = (unsigned char)( rec.data_len >> 8 ); - ssl->out_len[1] = (unsigned char)( rec.data_len ); - } - - protected_record_size = len + mbedtls_ssl_out_hdr_len( ssl ); - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - /* In case of DTLS, double-check that we don't exceed - * the remaining space in the datagram. */ - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - { - ret = ssl_get_remaining_space_in_datagram( ssl ); - if( ret < 0 ) - return( ret ); - - if( protected_record_size > (size_t) ret ) - { - /* Should never happen */ - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - } -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - - /* Now write the potentially updated record content type. */ - ssl->out_hdr[0] = (unsigned char) ssl->out_msgtype; - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "output record: msgtype = %d, " - "version = [%d:%d], msglen = %d", - ssl->out_hdr[0], ssl->out_hdr[1], - ssl->out_hdr[2], len ) ); - - MBEDTLS_SSL_DEBUG_BUF( 4, "output record sent to network", - ssl->out_hdr, protected_record_size ); - - ssl->out_left += protected_record_size; - ssl->out_hdr += protected_record_size; - mbedtls_ssl_update_out_pointers( ssl, ssl->transform_out ); - - for( i = 8; i > mbedtls_ssl_ep_len( ssl ); i-- ) - if( ++ssl->cur_out_ctr[i - 1] != 0 ) - break; - - /* The loop goes to its end iff the counter is wrapping */ - if( i == mbedtls_ssl_ep_len( ssl ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "outgoing message counter would wrap" ) ); - return( MBEDTLS_ERR_SSL_COUNTER_WRAPPING ); - } - } - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && - flush == SSL_DONT_FORCE_FLUSH ) - { - size_t remaining; - ret = ssl_get_remaining_payload_in_datagram( ssl ); - if( ret < 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "ssl_get_remaining_payload_in_datagram", - ret ); - return( ret ); - } - - remaining = (size_t) ret; - if( remaining == 0 ) - { - flush = SSL_FORCE_FLUSH; - } - else - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "Still %u bytes available in current datagram", (unsigned) remaining ) ); - } - } -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - - if( ( flush == SSL_FORCE_FLUSH ) && - ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_flush_output", ret ); - return( ret ); - } - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write record" ) ); - - return( 0 ); -} - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - -static int ssl_hs_is_proper_fragment( mbedtls_ssl_context *ssl ) -{ - if( ssl->in_msglen < ssl->in_hslen || - memcmp( ssl->in_msg + 6, "\0\0\0", 3 ) != 0 || - memcmp( ssl->in_msg + 9, ssl->in_msg + 1, 3 ) != 0 ) - { - return( 1 ); - } - return( 0 ); -} - -static uint32_t ssl_get_hs_frag_len( mbedtls_ssl_context const *ssl ) -{ - return( ( ssl->in_msg[9] << 16 ) | - ( ssl->in_msg[10] << 8 ) | - ssl->in_msg[11] ); -} - -static uint32_t ssl_get_hs_frag_off( mbedtls_ssl_context const *ssl ) -{ - return( ( ssl->in_msg[6] << 16 ) | - ( ssl->in_msg[7] << 8 ) | - ssl->in_msg[8] ); -} - -static int ssl_check_hs_header( mbedtls_ssl_context const *ssl ) -{ - uint32_t msg_len, frag_off, frag_len; - - msg_len = ssl_get_hs_total_len( ssl ); - frag_off = ssl_get_hs_frag_off( ssl ); - frag_len = ssl_get_hs_frag_len( ssl ); - - if( frag_off > msg_len ) - return( -1 ); - - if( frag_len > msg_len - frag_off ) - return( -1 ); - - if( frag_len + 12 > ssl->in_msglen ) - return( -1 ); - - return( 0 ); -} - -/* - * Mark bits in bitmask (used for DTLS HS reassembly) - */ -static void ssl_bitmask_set( unsigned char *mask, size_t offset, size_t len ) -{ - unsigned int start_bits, end_bits; - - start_bits = 8 - ( offset % 8 ); - if( start_bits != 8 ) - { - size_t first_byte_idx = offset / 8; - - /* Special case */ - if( len <= start_bits ) - { - for( ; len != 0; len-- ) - mask[first_byte_idx] |= 1 << ( start_bits - len ); - - /* Avoid potential issues with offset or len becoming invalid */ - return; - } - - offset += start_bits; /* Now offset % 8 == 0 */ - len -= start_bits; - - for( ; start_bits != 0; start_bits-- ) - mask[first_byte_idx] |= 1 << ( start_bits - 1 ); - } - - end_bits = len % 8; - if( end_bits != 0 ) - { - size_t last_byte_idx = ( offset + len ) / 8; - - len -= end_bits; /* Now len % 8 == 0 */ - - for( ; end_bits != 0; end_bits-- ) - mask[last_byte_idx] |= 1 << ( 8 - end_bits ); - } - - memset( mask + offset / 8, 0xFF, len / 8 ); -} - -/* - * Check that bitmask is full - */ -static int ssl_bitmask_check( unsigned char *mask, size_t len ) -{ - size_t i; - - for( i = 0; i < len / 8; i++ ) - if( mask[i] != 0xFF ) - return( -1 ); - - for( i = 0; i < len % 8; i++ ) - if( ( mask[len / 8] & ( 1 << ( 7 - i ) ) ) == 0 ) - return( -1 ); - - return( 0 ); -} - -/* msg_len does not include the handshake header */ -static size_t ssl_get_reassembly_buffer_size( size_t msg_len, - unsigned add_bitmap ) -{ - size_t alloc_len; - - alloc_len = 12; /* Handshake header */ - alloc_len += msg_len; /* Content buffer */ - - if( add_bitmap ) - alloc_len += msg_len / 8 + ( msg_len % 8 != 0 ); /* Bitmap */ - - return( alloc_len ); -} - -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - -static uint32_t ssl_get_hs_total_len( mbedtls_ssl_context const *ssl ) -{ - return( ( ssl->in_msg[1] << 16 ) | - ( ssl->in_msg[2] << 8 ) | - ssl->in_msg[3] ); -} - -int mbedtls_ssl_prepare_handshake_record( mbedtls_ssl_context *ssl ) -{ - if( ssl->in_msglen < mbedtls_ssl_hs_hdr_len( ssl ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "handshake message too short: %d", - ssl->in_msglen ) ); - return( MBEDTLS_ERR_SSL_INVALID_RECORD ); - } - - ssl->in_hslen = mbedtls_ssl_hs_hdr_len( ssl ) + ssl_get_hs_total_len( ssl ); - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "handshake message: msglen =" - " %d, type = %d, hslen = %d", - ssl->in_msglen, ssl->in_msg[0], ssl->in_hslen ) ); - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - { - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - unsigned int recv_msg_seq = ( ssl->in_msg[4] << 8 ) | ssl->in_msg[5]; - - if( ssl_check_hs_header( ssl ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid handshake header" ) ); - return( MBEDTLS_ERR_SSL_INVALID_RECORD ); - } - - if( ssl->handshake != NULL && - ( ( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER && - recv_msg_seq != ssl->handshake->in_msg_seq ) || - ( ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER && - ssl->in_msg[0] != MBEDTLS_SSL_HS_CLIENT_HELLO ) ) ) - { - if( recv_msg_seq > ssl->handshake->in_msg_seq ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "received future handshake message of sequence number %u (next %u)", - recv_msg_seq, - ssl->handshake->in_msg_seq ) ); - return( MBEDTLS_ERR_SSL_EARLY_MESSAGE ); - } - - /* Retransmit only on last message from previous flight, to avoid - * too many retransmissions. - * Besides, No sane server ever retransmits HelloVerifyRequest */ - if( recv_msg_seq == ssl->handshake->in_flight_start_seq - 1 && - ssl->in_msg[0] != MBEDTLS_SSL_HS_HELLO_VERIFY_REQUEST ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "received message from last flight, " - "message_seq = %d, start_of_flight = %d", - recv_msg_seq, - ssl->handshake->in_flight_start_seq ) ); - - if( ( ret = mbedtls_ssl_resend( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_resend", ret ); - return( ret ); - } - } - else - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "dropping out-of-sequence message: " - "message_seq = %d, expected = %d", - recv_msg_seq, - ssl->handshake->in_msg_seq ) ); - } - - return( MBEDTLS_ERR_SSL_CONTINUE_PROCESSING ); - } - /* Wait until message completion to increment in_msg_seq */ - - /* Message reassembly is handled alongside buffering of future - * messages; the commonality is that both handshake fragments and - * future messages cannot be forwarded immediately to the - * handshake logic layer. */ - if( ssl_hs_is_proper_fragment( ssl ) == 1 ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "found fragmented DTLS handshake message" ) ); - return( MBEDTLS_ERR_SSL_EARLY_MESSAGE ); - } - } - else -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - /* With TLS we don't handle fragmentation (for now) */ - if( ssl->in_msglen < ssl->in_hslen ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "TLS handshake fragmentation not supported" ) ); - return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE ); - } - - return( 0 ); -} - -void mbedtls_ssl_update_handshake_status( mbedtls_ssl_context *ssl ) -{ - mbedtls_ssl_handshake_params * const hs = ssl->handshake; - - if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER && hs != NULL ) - { - ssl->handshake->update_checksum( ssl, ssl->in_msg, ssl->in_hslen ); - } - - /* Handshake message is complete, increment counter */ -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && - ssl->handshake != NULL ) - { - unsigned offset; - mbedtls_ssl_hs_buffer *hs_buf; - - /* Increment handshake sequence number */ - hs->in_msg_seq++; - - /* - * Clear up handshake buffering and reassembly structure. - */ - - /* Free first entry */ - ssl_buffering_free_slot( ssl, 0 ); - - /* Shift all other entries */ - for( offset = 0, hs_buf = &hs->buffering.hs[0]; - offset + 1 < MBEDTLS_SSL_MAX_BUFFERED_HS; - offset++, hs_buf++ ) - { - *hs_buf = *(hs_buf + 1); - } - - /* Create a fresh last entry */ - memset( hs_buf, 0, sizeof( mbedtls_ssl_hs_buffer ) ); - } -#endif -} - -/* - * DTLS anti-replay: RFC 6347 4.1.2.6 - * - * in_window is a field of bits numbered from 0 (lsb) to 63 (msb). - * Bit n is set iff record number in_window_top - n has been seen. - * - * Usually, in_window_top is the last record number seen and the lsb of - * in_window is set. The only exception is the initial state (record number 0 - * not seen yet). - */ -#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY) -void mbedtls_ssl_dtls_replay_reset( mbedtls_ssl_context *ssl ) -{ - ssl->in_window_top = 0; - ssl->in_window = 0; -} - -static inline uint64_t ssl_load_six_bytes( unsigned char *buf ) -{ - return( ( (uint64_t) buf[0] << 40 ) | - ( (uint64_t) buf[1] << 32 ) | - ( (uint64_t) buf[2] << 24 ) | - ( (uint64_t) buf[3] << 16 ) | - ( (uint64_t) buf[4] << 8 ) | - ( (uint64_t) buf[5] ) ); -} - -static int mbedtls_ssl_dtls_record_replay_check( mbedtls_ssl_context *ssl, uint8_t *record_in_ctr ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - unsigned char *original_in_ctr; - - // save original in_ctr - original_in_ctr = ssl->in_ctr; - - // use counter from record - ssl->in_ctr = record_in_ctr; - - ret = mbedtls_ssl_dtls_replay_check( (mbedtls_ssl_context const *) ssl ); - - // restore the counter - ssl->in_ctr = original_in_ctr; - - return ret; -} - -/* - * Return 0 if sequence number is acceptable, -1 otherwise - */ -int mbedtls_ssl_dtls_replay_check( mbedtls_ssl_context const *ssl ) -{ - uint64_t rec_seqnum = ssl_load_six_bytes( ssl->in_ctr + 2 ); - uint64_t bit; - - if( ssl->conf->anti_replay == MBEDTLS_SSL_ANTI_REPLAY_DISABLED ) - return( 0 ); - - if( rec_seqnum > ssl->in_window_top ) - return( 0 ); - - bit = ssl->in_window_top - rec_seqnum; - - if( bit >= 64 ) - return( -1 ); - - if( ( ssl->in_window & ( (uint64_t) 1 << bit ) ) != 0 ) - return( -1 ); - - return( 0 ); -} - -/* - * Update replay window on new validated record - */ -void mbedtls_ssl_dtls_replay_update( mbedtls_ssl_context *ssl ) -{ - uint64_t rec_seqnum = ssl_load_six_bytes( ssl->in_ctr + 2 ); - - if( ssl->conf->anti_replay == MBEDTLS_SSL_ANTI_REPLAY_DISABLED ) - return; - - if( rec_seqnum > ssl->in_window_top ) - { - /* Update window_top and the contents of the window */ - uint64_t shift = rec_seqnum - ssl->in_window_top; - - if( shift >= 64 ) - ssl->in_window = 1; - else - { - ssl->in_window <<= shift; - ssl->in_window |= 1; - } - - ssl->in_window_top = rec_seqnum; - } - else - { - /* Mark that number as seen in the current window */ - uint64_t bit = ssl->in_window_top - rec_seqnum; - - if( bit < 64 ) /* Always true, but be extra sure */ - ssl->in_window |= (uint64_t) 1 << bit; - } -} -#endif /* MBEDTLS_SSL_DTLS_ANTI_REPLAY */ - -#if defined(MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE) && defined(MBEDTLS_SSL_SRV_C) -/* - * Without any SSL context, check if a datagram looks like a ClientHello with - * a valid cookie, and if it doesn't, generate a HelloVerifyRequest message. - * Both input and output include full DTLS headers. - * - * - if cookie is valid, return 0 - * - if ClientHello looks superficially valid but cookie is not, - * fill obuf and set olen, then - * return MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED - * - otherwise return a specific error code - */ -static int ssl_check_dtls_clihlo_cookie( - mbedtls_ssl_cookie_write_t *f_cookie_write, - mbedtls_ssl_cookie_check_t *f_cookie_check, - void *p_cookie, - const unsigned char *cli_id, size_t cli_id_len, - const unsigned char *in, size_t in_len, - unsigned char *obuf, size_t buf_len, size_t *olen ) -{ - size_t sid_len, cookie_len; - unsigned char *p; - - /* - * Structure of ClientHello with record and handshake headers, - * and expected values. We don't need to check a lot, more checks will be - * done when actually parsing the ClientHello - skipping those checks - * avoids code duplication and does not make cookie forging any easier. - * - * 0-0 ContentType type; copied, must be handshake - * 1-2 ProtocolVersion version; copied - * 3-4 uint16 epoch; copied, must be 0 - * 5-10 uint48 sequence_number; copied - * 11-12 uint16 length; (ignored) - * - * 13-13 HandshakeType msg_type; (ignored) - * 14-16 uint24 length; (ignored) - * 17-18 uint16 message_seq; copied - * 19-21 uint24 fragment_offset; copied, must be 0 - * 22-24 uint24 fragment_length; (ignored) - * - * 25-26 ProtocolVersion client_version; (ignored) - * 27-58 Random random; (ignored) - * 59-xx SessionID session_id; 1 byte len + sid_len content - * 60+ opaque cookie<0..2^8-1>; 1 byte len + content - * ... - * - * Minimum length is 61 bytes. - */ - if( in_len < 61 || - in[0] != MBEDTLS_SSL_MSG_HANDSHAKE || - in[3] != 0 || in[4] != 0 || - in[19] != 0 || in[20] != 0 || in[21] != 0 ) - { - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - sid_len = in[59]; - if( sid_len > in_len - 61 ) - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - - cookie_len = in[60 + sid_len]; - if( cookie_len > in_len - 60 ) - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - - if( f_cookie_check( p_cookie, in + sid_len + 61, cookie_len, - cli_id, cli_id_len ) == 0 ) - { - /* Valid cookie */ - return( 0 ); - } - - /* - * If we get here, we've got an invalid cookie, let's prepare HVR. - * - * 0-0 ContentType type; copied - * 1-2 ProtocolVersion version; copied - * 3-4 uint16 epoch; copied - * 5-10 uint48 sequence_number; copied - * 11-12 uint16 length; olen - 13 - * - * 13-13 HandshakeType msg_type; hello_verify_request - * 14-16 uint24 length; olen - 25 - * 17-18 uint16 message_seq; copied - * 19-21 uint24 fragment_offset; copied - * 22-24 uint24 fragment_length; olen - 25 - * - * 25-26 ProtocolVersion server_version; 0xfe 0xff - * 27-27 opaque cookie<0..2^8-1>; cookie_len = olen - 27, cookie - * - * Minimum length is 28. - */ - if( buf_len < 28 ) - return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL ); - - /* Copy most fields and adapt others */ - memcpy( obuf, in, 25 ); - obuf[13] = MBEDTLS_SSL_HS_HELLO_VERIFY_REQUEST; - obuf[25] = 0xfe; - obuf[26] = 0xff; - - /* Generate and write actual cookie */ - p = obuf + 28; - if( f_cookie_write( p_cookie, - &p, obuf + buf_len, cli_id, cli_id_len ) != 0 ) - { - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - - *olen = p - obuf; - - /* Go back and fill length fields */ - obuf[27] = (unsigned char)( *olen - 28 ); - - obuf[14] = obuf[22] = (unsigned char)( ( *olen - 25 ) >> 16 ); - obuf[15] = obuf[23] = (unsigned char)( ( *olen - 25 ) >> 8 ); - obuf[16] = obuf[24] = (unsigned char)( ( *olen - 25 ) ); - - obuf[11] = (unsigned char)( ( *olen - 13 ) >> 8 ); - obuf[12] = (unsigned char)( ( *olen - 13 ) ); - - return( MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED ); -} - -/* - * Handle possible client reconnect with the same UDP quadruplet - * (RFC 6347 Section 4.2.8). - * - * Called by ssl_parse_record_header() in case we receive an epoch 0 record - * that looks like a ClientHello. - * - * - if the input looks like a ClientHello without cookies, - * send back HelloVerifyRequest, then - * return MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED - * - if the input looks like a ClientHello with a valid cookie, - * reset the session of the current context, and - * return MBEDTLS_ERR_SSL_CLIENT_RECONNECT - * - if anything goes wrong, return a specific error code - * - * mbedtls_ssl_read_record() will ignore the record if anything else than - * MBEDTLS_ERR_SSL_CLIENT_RECONNECT or 0 is returned, although this function - * cannot not return 0. - */ -static int ssl_handle_possible_reconnect( mbedtls_ssl_context *ssl ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - size_t len; - - if( ssl->conf->f_cookie_write == NULL || - ssl->conf->f_cookie_check == NULL ) - { - /* If we can't use cookies to verify reachability of the peer, - * drop the record. */ - return( 0 ); - } - - ret = ssl_check_dtls_clihlo_cookie( - ssl->conf->f_cookie_write, - ssl->conf->f_cookie_check, - ssl->conf->p_cookie, - ssl->cli_id, ssl->cli_id_len, - ssl->in_buf, ssl->in_left, - ssl->out_buf, MBEDTLS_SSL_OUT_CONTENT_LEN, &len ); - - MBEDTLS_SSL_DEBUG_RET( 2, "ssl_check_dtls_clihlo_cookie", ret ); - - if( ret == MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED ) - { - /* Don't check write errors as we can't do anything here. - * If the error is permanent we'll catch it later, - * if it's not, then hopefully it'll work next time. */ - (void) ssl->f_send( ssl->p_bio, ssl->out_buf, len ); - ret = 0; - } - - if( ret == 0 ) - { - /* Got a valid cookie, partially reset context */ - if( ( ret = mbedtls_ssl_session_reset_int( ssl, 1 ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "reset", ret ); - return( ret ); - } - - return( MBEDTLS_ERR_SSL_CLIENT_RECONNECT ); - } - - return( ret ); -} -#endif /* MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE && MBEDTLS_SSL_SRV_C */ - -static int ssl_check_record_type( uint8_t record_type ) -{ - if( record_type != MBEDTLS_SSL_MSG_HANDSHAKE && - record_type != MBEDTLS_SSL_MSG_ALERT && - record_type != MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC && - record_type != MBEDTLS_SSL_MSG_APPLICATION_DATA ) - { - return( MBEDTLS_ERR_SSL_INVALID_RECORD ); - } - - return( 0 ); -} - -/* - * ContentType type; - * ProtocolVersion version; - * uint16 epoch; // DTLS only - * uint48 sequence_number; // DTLS only - * uint16 length; - * - * Return 0 if header looks sane (and, for DTLS, the record is expected) - * MBEDTLS_ERR_SSL_INVALID_RECORD if the header looks bad, - * MBEDTLS_ERR_SSL_UNEXPECTED_RECORD (DTLS only) if sane but unexpected. - * - * With DTLS, mbedtls_ssl_read_record() will: - * 1. proceed with the record if this function returns 0 - * 2. drop only the current record if this function returns UNEXPECTED_RECORD - * 3. return CLIENT_RECONNECT if this function return that value - * 4. drop the whole datagram if this function returns anything else. - * Point 2 is needed when the peer is resending, and we have already received - * the first record from a datagram but are still waiting for the others. - */ -static int ssl_parse_record_header( mbedtls_ssl_context const *ssl, - unsigned char *buf, - size_t len, - mbedtls_record *rec ) -{ - int major_ver, minor_ver; - - size_t const rec_hdr_type_offset = 0; - size_t const rec_hdr_type_len = 1; - - size_t const rec_hdr_version_offset = rec_hdr_type_offset + - rec_hdr_type_len; - size_t const rec_hdr_version_len = 2; - - size_t const rec_hdr_ctr_len = 8; -#if defined(MBEDTLS_SSL_PROTO_DTLS) - uint32_t rec_epoch; - size_t const rec_hdr_ctr_offset = rec_hdr_version_offset + - rec_hdr_version_len; - -#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) - size_t const rec_hdr_cid_offset = rec_hdr_ctr_offset + - rec_hdr_ctr_len; - size_t rec_hdr_cid_len = 0; -#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - - size_t rec_hdr_len_offset; /* To be determined */ - size_t const rec_hdr_len_len = 2; - - /* - * Check minimum lengths for record header. - */ - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - { - rec_hdr_len_offset = rec_hdr_ctr_offset + rec_hdr_ctr_len; - } - else -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - { - rec_hdr_len_offset = rec_hdr_version_offset + rec_hdr_version_len; - } - - if( len < rec_hdr_len_offset + rec_hdr_len_len ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "datagram of length %u too small to hold DTLS record header of length %u", - (unsigned) len, - (unsigned)( rec_hdr_len_len + rec_hdr_len_len ) ) ); - return( MBEDTLS_ERR_SSL_INVALID_RECORD ); - } - - /* - * Parse and validate record content type - */ - - rec->type = buf[ rec_hdr_type_offset ]; - - /* Check record content type */ -#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) - rec->cid_len = 0; - - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && - ssl->conf->cid_len != 0 && - rec->type == MBEDTLS_SSL_MSG_CID ) - { - /* Shift pointers to account for record header including CID - * struct { - * ContentType special_type = tls12_cid; - * ProtocolVersion version; - * uint16 epoch; - * uint48 sequence_number; - * opaque cid[cid_length]; // Additional field compared to - * // default DTLS record format - * uint16 length; - * opaque enc_content[DTLSCiphertext.length]; - * } DTLSCiphertext; - */ - - /* So far, we only support static CID lengths - * fixed in the configuration. */ - rec_hdr_cid_len = ssl->conf->cid_len; - rec_hdr_len_offset += rec_hdr_cid_len; - - if( len < rec_hdr_len_offset + rec_hdr_len_len ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "datagram of length %u too small to hold DTLS record header including CID, length %u", - (unsigned) len, - (unsigned)( rec_hdr_len_offset + rec_hdr_len_len ) ) ); - return( MBEDTLS_ERR_SSL_INVALID_RECORD ); - } - - /* configured CID len is guaranteed at most 255, see - * MBEDTLS_SSL_CID_OUT_LEN_MAX in check_config.h */ - rec->cid_len = (uint8_t) rec_hdr_cid_len; - memcpy( rec->cid, buf + rec_hdr_cid_offset, rec_hdr_cid_len ); - } - else -#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ - { - if( ssl_check_record_type( rec->type ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "unknown record type %u", - (unsigned) rec->type ) ); - return( MBEDTLS_ERR_SSL_INVALID_RECORD ); - } - } - - /* - * Parse and validate record version - */ - - rec->ver[0] = buf[ rec_hdr_version_offset + 0 ]; - rec->ver[1] = buf[ rec_hdr_version_offset + 1 ]; - mbedtls_ssl_read_version( &major_ver, &minor_ver, - ssl->conf->transport, - &rec->ver[0] ); - - if( major_ver != ssl->major_ver ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "major version mismatch" ) ); - return( MBEDTLS_ERR_SSL_INVALID_RECORD ); - } - - if( minor_ver > ssl->conf->max_minor_ver ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "minor version mismatch" ) ); - return( MBEDTLS_ERR_SSL_INVALID_RECORD ); - } - - /* - * Parse/Copy record sequence number. - */ - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - { - /* Copy explicit record sequence number from input buffer. */ - memcpy( &rec->ctr[0], buf + rec_hdr_ctr_offset, - rec_hdr_ctr_len ); - } - else -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - { - /* Copy implicit record sequence number from SSL context structure. */ - memcpy( &rec->ctr[0], ssl->in_ctr, rec_hdr_ctr_len ); - } - - /* - * Parse record length. - */ - - rec->data_offset = rec_hdr_len_offset + rec_hdr_len_len; - rec->data_len = ( (size_t) buf[ rec_hdr_len_offset + 0 ] << 8 ) | - ( (size_t) buf[ rec_hdr_len_offset + 1 ] << 0 ); - MBEDTLS_SSL_DEBUG_BUF( 4, "input record header", buf, rec->data_offset ); - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "input record: msgtype = %d, " - "version = [%d:%d], msglen = %d", - rec->type, - major_ver, minor_ver, rec->data_len ) ); - - rec->buf = buf; - rec->buf_len = rec->data_offset + rec->data_len; - - if( rec->data_len == 0 ) - return( MBEDTLS_ERR_SSL_INVALID_RECORD ); - - /* - * DTLS-related tests. - * Check epoch before checking length constraint because - * the latter varies with the epoch. E.g., if a ChangeCipherSpec - * message gets duplicated before the corresponding Finished message, - * the second ChangeCipherSpec should be discarded because it belongs - * to an old epoch, but not because its length is shorter than - * the minimum record length for packets using the new record transform. - * Note that these two kinds of failures are handled differently, - * as an unexpected record is silently skipped but an invalid - * record leads to the entire datagram being dropped. - */ -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - { - rec_epoch = ( rec->ctr[0] << 8 ) | rec->ctr[1]; - - /* Check that the datagram is large enough to contain a record - * of the advertised length. */ - if( len < rec->data_offset + rec->data_len ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "Datagram of length %u too small to contain record of advertised length %u.", - (unsigned) len, - (unsigned)( rec->data_offset + rec->data_len ) ) ); - return( MBEDTLS_ERR_SSL_INVALID_RECORD ); - } - - /* Records from other, non-matching epochs are silently discarded. - * (The case of same-port Client reconnects must be considered in - * the caller). */ - if( rec_epoch != ssl->in_epoch ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "record from another epoch: " - "expected %d, received %d", - ssl->in_epoch, rec_epoch ) ); - - /* Records from the next epoch are considered for buffering - * (concretely: early Finished messages). */ - if( rec_epoch == (unsigned) ssl->in_epoch + 1 ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "Consider record for buffering" ) ); - return( MBEDTLS_ERR_SSL_EARLY_MESSAGE ); - } - - return( MBEDTLS_ERR_SSL_UNEXPECTED_RECORD ); - } -#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY) - /* For records from the correct epoch, check whether their - * sequence number has been seen before. */ - else if( mbedtls_ssl_dtls_record_replay_check( (mbedtls_ssl_context *) ssl, - &rec->ctr[0] ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "replayed record" ) ); - return( MBEDTLS_ERR_SSL_UNEXPECTED_RECORD ); - } -#endif - } -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - - return( 0 ); -} - - -#if defined(MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE) && defined(MBEDTLS_SSL_SRV_C) -static int ssl_check_client_reconnect( mbedtls_ssl_context *ssl ) -{ - unsigned int rec_epoch = ( ssl->in_ctr[0] << 8 ) | ssl->in_ctr[1]; - - /* - * Check for an epoch 0 ClientHello. We can't use in_msg here to - * access the first byte of record content (handshake type), as we - * have an active transform (possibly iv_len != 0), so use the - * fact that the record header len is 13 instead. - */ - if( rec_epoch == 0 && - ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER && - ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER && - ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE && - ssl->in_left > 13 && - ssl->in_buf[13] == MBEDTLS_SSL_HS_CLIENT_HELLO ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "possible client reconnect " - "from the same port" ) ); - return( ssl_handle_possible_reconnect( ssl ) ); - } - - return( 0 ); -} -#endif /* MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE && MBEDTLS_SSL_SRV_C */ - -/* - * If applicable, decrypt record content - */ -static int ssl_prepare_record_content( mbedtls_ssl_context *ssl, - mbedtls_record *rec ) -{ - int ret, done = 0; - - MBEDTLS_SSL_DEBUG_BUF( 4, "input record from network", - rec->buf, rec->buf_len ); - -#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL) - if( mbedtls_ssl_hw_record_read != NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "going for mbedtls_ssl_hw_record_read()" ) ); - - ret = mbedtls_ssl_hw_record_read( ssl ); - if( ret != 0 && ret != MBEDTLS_ERR_SSL_HW_ACCEL_FALLTHROUGH ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_read", ret ); - return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED ); - } - - if( ret == 0 ) - done = 1; - } -#endif /* MBEDTLS_SSL_HW_RECORD_ACCEL */ - if( !done && ssl->transform_in != NULL ) - { - unsigned char const old_msg_type = rec->type; - - if( ( ret = mbedtls_ssl_decrypt_buf( ssl, ssl->transform_in, - rec ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "ssl_decrypt_buf", ret ); - -#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) - if( ret == MBEDTLS_ERR_SSL_UNEXPECTED_CID && - ssl->conf->ignore_unexpected_cid - == MBEDTLS_SSL_UNEXPECTED_CID_IGNORE ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "ignoring unexpected CID" ) ); - ret = MBEDTLS_ERR_SSL_CONTINUE_PROCESSING; - } -#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ - - return( ret ); - } - - if( old_msg_type != rec->type ) - { - MBEDTLS_SSL_DEBUG_MSG( 4, ( "record type after decrypt (before %d): %d", - old_msg_type, rec->type ) ); - } - - MBEDTLS_SSL_DEBUG_BUF( 4, "input payload after decrypt", - rec->buf + rec->data_offset, rec->data_len ); - -#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) - /* We have already checked the record content type - * in ssl_parse_record_header(), failing or silently - * dropping the record in the case of an unknown type. - * - * Since with the use of CIDs, the record content type - * might change during decryption, re-check the record - * content type, but treat a failure as fatal this time. */ - if( ssl_check_record_type( rec->type ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "unknown record type" ) ); - return( MBEDTLS_ERR_SSL_INVALID_RECORD ); - } -#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ - - if( rec->data_len == 0 ) - { -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) - if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 - && rec->type != MBEDTLS_SSL_MSG_APPLICATION_DATA ) - { - /* TLS v1.2 explicitly disallows zero-length messages which are not application data */ - MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid zero-length message type: %d", ssl->in_msgtype ) ); - return( MBEDTLS_ERR_SSL_INVALID_RECORD ); - } -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ - - ssl->nb_zero++; - - /* - * Three or more empty messages may be a DoS attack - * (excessive CPU consumption). - */ - if( ssl->nb_zero > 3 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "received four consecutive empty " - "messages, possible DoS attack" ) ); - /* Treat the records as if they were not properly authenticated, - * thereby failing the connection if we see more than allowed - * by the configured bad MAC threshold. */ - return( MBEDTLS_ERR_SSL_INVALID_MAC ); - } - } - else - ssl->nb_zero = 0; - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - { - ; /* in_ctr read from peer, not maintained internally */ - } - else -#endif - { - unsigned i; - for( i = 8; i > mbedtls_ssl_ep_len( ssl ); i-- ) - if( ++ssl->in_ctr[i - 1] != 0 ) - break; - - /* The loop goes to its end iff the counter is wrapping */ - if( i == mbedtls_ssl_ep_len( ssl ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "incoming message counter would wrap" ) ); - return( MBEDTLS_ERR_SSL_COUNTER_WRAPPING ); - } - } - - } - -#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - { - mbedtls_ssl_dtls_replay_update( ssl ); - } -#endif - - /* Check actual (decrypted) record content length against - * configured maximum. */ - if( ssl->in_msglen > MBEDTLS_SSL_IN_CONTENT_LEN ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad message length" ) ); - return( MBEDTLS_ERR_SSL_INVALID_RECORD ); - } - - return( 0 ); -} - -/* - * Read a record. - * - * Silently ignore non-fatal alert (and for DTLS, invalid records as well, - * RFC 6347 4.1.2.7) and continue reading until a valid record is found. - * - */ - -/* Helper functions for mbedtls_ssl_read_record(). */ -static int ssl_consume_current_message( mbedtls_ssl_context *ssl ); -static int ssl_get_next_record( mbedtls_ssl_context *ssl ); -static int ssl_record_is_in_progress( mbedtls_ssl_context *ssl ); - -int mbedtls_ssl_read_record( mbedtls_ssl_context *ssl, - unsigned update_hs_digest ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> read record" ) ); - - if( ssl->keep_current_message == 0 ) - { - do { - - ret = ssl_consume_current_message( ssl ); - if( ret != 0 ) - return( ret ); - - if( ssl_record_is_in_progress( ssl ) == 0 ) - { -#if defined(MBEDTLS_SSL_PROTO_DTLS) - int have_buffered = 0; - - /* We only check for buffered messages if the - * current datagram is fully consumed. */ - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && - ssl_next_record_is_in_datagram( ssl ) == 0 ) - { - if( ssl_load_buffered_message( ssl ) == 0 ) - have_buffered = 1; - } - - if( have_buffered == 0 ) -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - { - ret = ssl_get_next_record( ssl ); - if( ret == MBEDTLS_ERR_SSL_CONTINUE_PROCESSING ) - continue; - - if( ret != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_get_next_record" ), ret ); - return( ret ); - } - } - } - - ret = mbedtls_ssl_handle_message_type( ssl ); - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ret == MBEDTLS_ERR_SSL_EARLY_MESSAGE ) - { - /* Buffer future message */ - ret = ssl_buffer_message( ssl ); - if( ret != 0 ) - return( ret ); - - ret = MBEDTLS_ERR_SSL_CONTINUE_PROCESSING; - } -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - - } while( MBEDTLS_ERR_SSL_NON_FATAL == ret || - MBEDTLS_ERR_SSL_CONTINUE_PROCESSING == ret ); - - if( 0 != ret ) - { - MBEDTLS_SSL_DEBUG_RET( 1, ( "mbedtls_ssl_handle_message_type" ), ret ); - return( ret ); - } - - if( ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE && - update_hs_digest == 1 ) - { - mbedtls_ssl_update_handshake_status( ssl ); - } - } - else - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "reuse previously read message" ) ); - ssl->keep_current_message = 0; - } - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= read record" ) ); - - return( 0 ); -} - -#if defined(MBEDTLS_SSL_PROTO_DTLS) -static int ssl_next_record_is_in_datagram( mbedtls_ssl_context *ssl ) -{ - if( ssl->in_left > ssl->next_record_offset ) - return( 1 ); - - return( 0 ); -} - -static int ssl_load_buffered_message( mbedtls_ssl_context *ssl ) -{ - mbedtls_ssl_handshake_params * const hs = ssl->handshake; - mbedtls_ssl_hs_buffer * hs_buf; - int ret = 0; - - if( hs == NULL ) - return( -1 ); - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> ssl_load_buffered_messsage" ) ); - - if( ssl->state == MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC || - ssl->state == MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC ) - { - /* Check if we have seen a ChangeCipherSpec before. - * If yes, synthesize a CCS record. */ - if( !hs->buffering.seen_ccs ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "CCS not seen in the current flight" ) ); - ret = -1; - goto exit; - } - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "Injecting buffered CCS message" ) ); - ssl->in_msgtype = MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC; - ssl->in_msglen = 1; - ssl->in_msg[0] = 1; - - /* As long as they are equal, the exact value doesn't matter. */ - ssl->in_left = 0; - ssl->next_record_offset = 0; - - hs->buffering.seen_ccs = 0; - goto exit; - } - -#if defined(MBEDTLS_DEBUG_C) - /* Debug only */ - { - unsigned offset; - for( offset = 1; offset < MBEDTLS_SSL_MAX_BUFFERED_HS; offset++ ) - { - hs_buf = &hs->buffering.hs[offset]; - if( hs_buf->is_valid == 1 ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "Future message with sequence number %u %s buffered.", - hs->in_msg_seq + offset, - hs_buf->is_complete ? "fully" : "partially" ) ); - } - } - } -#endif /* MBEDTLS_DEBUG_C */ - - /* Check if we have buffered and/or fully reassembled the - * next handshake message. */ - hs_buf = &hs->buffering.hs[0]; - if( ( hs_buf->is_valid == 1 ) && ( hs_buf->is_complete == 1 ) ) - { - /* Synthesize a record containing the buffered HS message. */ - size_t msg_len = ( hs_buf->data[1] << 16 ) | - ( hs_buf->data[2] << 8 ) | - hs_buf->data[3]; - - /* Double-check that we haven't accidentally buffered - * a message that doesn't fit into the input buffer. */ - if( msg_len + 12 > MBEDTLS_SSL_IN_CONTENT_LEN ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "Next handshake message has been buffered - load" ) ); - MBEDTLS_SSL_DEBUG_BUF( 3, "Buffered handshake message (incl. header)", - hs_buf->data, msg_len + 12 ); - - ssl->in_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE; - ssl->in_hslen = msg_len + 12; - ssl->in_msglen = msg_len + 12; - memcpy( ssl->in_msg, hs_buf->data, ssl->in_hslen ); - - ret = 0; - goto exit; - } - else - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "Next handshake message %u not or only partially bufffered", - hs->in_msg_seq ) ); - } - - ret = -1; - -exit: - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= ssl_load_buffered_message" ) ); - return( ret ); -} - -static int ssl_buffer_make_space( mbedtls_ssl_context *ssl, - size_t desired ) -{ - int offset; - mbedtls_ssl_handshake_params * const hs = ssl->handshake; - MBEDTLS_SSL_DEBUG_MSG( 2, ( "Attempt to free buffered messages to have %u bytes available", - (unsigned) desired ) ); - - /* Get rid of future records epoch first, if such exist. */ - ssl_free_buffered_record( ssl ); - - /* Check if we have enough space available now. */ - if( desired <= ( MBEDTLS_SSL_DTLS_MAX_BUFFERING - - hs->buffering.total_bytes_buffered ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "Enough space available after freeing future epoch record" ) ); - return( 0 ); - } - - /* We don't have enough space to buffer the next expected handshake - * message. Remove buffers used for future messages to gain space, - * starting with the most distant one. */ - for( offset = MBEDTLS_SSL_MAX_BUFFERED_HS - 1; - offset >= 0; offset-- ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "Free buffering slot %d to make space for reassembly of next handshake message", - offset ) ); - - ssl_buffering_free_slot( ssl, (uint8_t) offset ); - - /* Check if we have enough space available now. */ - if( desired <= ( MBEDTLS_SSL_DTLS_MAX_BUFFERING - - hs->buffering.total_bytes_buffered ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "Enough space available after freeing buffered HS messages" ) ); - return( 0 ); - } - } - - return( -1 ); -} - -static int ssl_buffer_message( mbedtls_ssl_context *ssl ) -{ - int ret = 0; - mbedtls_ssl_handshake_params * const hs = ssl->handshake; - - if( hs == NULL ) - return( 0 ); - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> ssl_buffer_message" ) ); - - switch( ssl->in_msgtype ) - { - case MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC: - MBEDTLS_SSL_DEBUG_MSG( 2, ( "Remember CCS message" ) ); - - hs->buffering.seen_ccs = 1; - break; - - case MBEDTLS_SSL_MSG_HANDSHAKE: - { - unsigned recv_msg_seq_offset; - unsigned recv_msg_seq = ( ssl->in_msg[4] << 8 ) | ssl->in_msg[5]; - mbedtls_ssl_hs_buffer *hs_buf; - size_t msg_len = ssl->in_hslen - 12; - - /* We should never receive an old handshake - * message - double-check nonetheless. */ - if( recv_msg_seq < ssl->handshake->in_msg_seq ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - - recv_msg_seq_offset = recv_msg_seq - ssl->handshake->in_msg_seq; - if( recv_msg_seq_offset >= MBEDTLS_SSL_MAX_BUFFERED_HS ) - { - /* Silently ignore -- message too far in the future */ - MBEDTLS_SSL_DEBUG_MSG( 2, - ( "Ignore future HS message with sequence number %u, " - "buffering window %u - %u", - recv_msg_seq, ssl->handshake->in_msg_seq, - ssl->handshake->in_msg_seq + MBEDTLS_SSL_MAX_BUFFERED_HS - 1 ) ); - - goto exit; - } - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "Buffering HS message with sequence number %u, offset %u ", - recv_msg_seq, recv_msg_seq_offset ) ); - - hs_buf = &hs->buffering.hs[ recv_msg_seq_offset ]; - - /* Check if the buffering for this seq nr has already commenced. */ - if( !hs_buf->is_valid ) - { - size_t reassembly_buf_sz; - - hs_buf->is_fragmented = - ( ssl_hs_is_proper_fragment( ssl ) == 1 ); - - /* We copy the message back into the input buffer - * after reassembly, so check that it's not too large. - * This is an implementation-specific limitation - * and not one from the standard, hence it is not - * checked in ssl_check_hs_header(). */ - if( msg_len + 12 > MBEDTLS_SSL_IN_CONTENT_LEN ) - { - /* Ignore message */ - goto exit; - } - - /* Check if we have enough space to buffer the message. */ - if( hs->buffering.total_bytes_buffered > - MBEDTLS_SSL_DTLS_MAX_BUFFERING ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - - reassembly_buf_sz = ssl_get_reassembly_buffer_size( msg_len, - hs_buf->is_fragmented ); - - if( reassembly_buf_sz > ( MBEDTLS_SSL_DTLS_MAX_BUFFERING - - hs->buffering.total_bytes_buffered ) ) - { - if( recv_msg_seq_offset > 0 ) - { - /* If we can't buffer a future message because - * of space limitations -- ignore. */ - MBEDTLS_SSL_DEBUG_MSG( 2, ( "Buffering of future message of size %u would exceed the compile-time limit %u (already %u bytes buffered) -- ignore\n", - (unsigned) msg_len, MBEDTLS_SSL_DTLS_MAX_BUFFERING, - (unsigned) hs->buffering.total_bytes_buffered ) ); - goto exit; - } - else - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "Buffering of future message of size %u would exceed the compile-time limit %u (already %u bytes buffered) -- attempt to make space by freeing buffered future messages\n", - (unsigned) msg_len, MBEDTLS_SSL_DTLS_MAX_BUFFERING, - (unsigned) hs->buffering.total_bytes_buffered ) ); - } - - if( ssl_buffer_make_space( ssl, reassembly_buf_sz ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "Reassembly of next message of size %u (%u with bitmap) would exceed the compile-time limit %u (already %u bytes buffered) -- fail\n", - (unsigned) msg_len, - (unsigned) reassembly_buf_sz, - MBEDTLS_SSL_DTLS_MAX_BUFFERING, - (unsigned) hs->buffering.total_bytes_buffered ) ); - ret = MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL; - goto exit; - } - } - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "initialize reassembly, total length = %d", - msg_len ) ); - - hs_buf->data = mbedtls_calloc( 1, reassembly_buf_sz ); - if( hs_buf->data == NULL ) - { - ret = MBEDTLS_ERR_SSL_ALLOC_FAILED; - goto exit; - } - hs_buf->data_len = reassembly_buf_sz; - - /* Prepare final header: copy msg_type, length and message_seq, - * then add standardised fragment_offset and fragment_length */ - memcpy( hs_buf->data, ssl->in_msg, 6 ); - memset( hs_buf->data + 6, 0, 3 ); - memcpy( hs_buf->data + 9, hs_buf->data + 1, 3 ); - - hs_buf->is_valid = 1; - - hs->buffering.total_bytes_buffered += reassembly_buf_sz; - } - else - { - /* Make sure msg_type and length are consistent */ - if( memcmp( hs_buf->data, ssl->in_msg, 4 ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "Fragment header mismatch - ignore" ) ); - /* Ignore */ - goto exit; - } - } - - if( !hs_buf->is_complete ) - { - size_t frag_len, frag_off; - unsigned char * const msg = hs_buf->data + 12; - - /* - * Check and copy current fragment - */ - - /* Validation of header fields already done in - * mbedtls_ssl_prepare_handshake_record(). */ - frag_off = ssl_get_hs_frag_off( ssl ); - frag_len = ssl_get_hs_frag_len( ssl ); - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "adding fragment, offset = %d, length = %d", - frag_off, frag_len ) ); - memcpy( msg + frag_off, ssl->in_msg + 12, frag_len ); - - if( hs_buf->is_fragmented ) - { - unsigned char * const bitmask = msg + msg_len; - ssl_bitmask_set( bitmask, frag_off, frag_len ); - hs_buf->is_complete = ( ssl_bitmask_check( bitmask, - msg_len ) == 0 ); - } - else - { - hs_buf->is_complete = 1; - } - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "message %scomplete", - hs_buf->is_complete ? "" : "not yet " ) ); - } - - break; - } - - default: - /* We don't buffer other types of messages. */ - break; - } - -exit: - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= ssl_buffer_message" ) ); - return( ret ); -} -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - -static int ssl_consume_current_message( mbedtls_ssl_context *ssl ) -{ - /* - * Consume last content-layer message and potentially - * update in_msglen which keeps track of the contents' - * consumption state. - * - * (1) Handshake messages: - * Remove last handshake message, move content - * and adapt in_msglen. - * - * (2) Alert messages: - * Consume whole record content, in_msglen = 0. - * - * (3) Change cipher spec: - * Consume whole record content, in_msglen = 0. - * - * (4) Application data: - * Don't do anything - the record layer provides - * the application data as a stream transport - * and consumes through mbedtls_ssl_read only. - * - */ - - /* Case (1): Handshake messages */ - if( ssl->in_hslen != 0 ) - { - /* Hard assertion to be sure that no application data - * is in flight, as corrupting ssl->in_msglen during - * ssl->in_offt != NULL is fatal. */ - if( ssl->in_offt != NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - - /* - * Get next Handshake message in the current record - */ - - /* Notes: - * (1) in_hslen is not necessarily the size of the - * current handshake content: If DTLS handshake - * fragmentation is used, that's the fragment - * size instead. Using the total handshake message - * size here is faulty and should be changed at - * some point. - * (2) While it doesn't seem to cause problems, one - * has to be very careful not to assume that in_hslen - * is always <= in_msglen in a sensible communication. - * Again, it's wrong for DTLS handshake fragmentation. - * The following check is therefore mandatory, and - * should not be treated as a silently corrected assertion. - * Additionally, ssl->in_hslen might be arbitrarily out of - * bounds after handling a DTLS message with an unexpected - * sequence number, see mbedtls_ssl_prepare_handshake_record. - */ - if( ssl->in_hslen < ssl->in_msglen ) - { - ssl->in_msglen -= ssl->in_hslen; - memmove( ssl->in_msg, ssl->in_msg + ssl->in_hslen, - ssl->in_msglen ); - - MBEDTLS_SSL_DEBUG_BUF( 4, "remaining content in record", - ssl->in_msg, ssl->in_msglen ); - } - else - { - ssl->in_msglen = 0; - } - - ssl->in_hslen = 0; - } - /* Case (4): Application data */ - else if( ssl->in_offt != NULL ) - { - return( 0 ); - } - /* Everything else (CCS & Alerts) */ - else - { - ssl->in_msglen = 0; - } - - return( 0 ); -} - -static int ssl_record_is_in_progress( mbedtls_ssl_context *ssl ) -{ - if( ssl->in_msglen > 0 ) - return( 1 ); - - return( 0 ); -} - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - -static void ssl_free_buffered_record( mbedtls_ssl_context *ssl ) -{ - mbedtls_ssl_handshake_params * const hs = ssl->handshake; - if( hs == NULL ) - return; - - if( hs->buffering.future_record.data != NULL ) - { - hs->buffering.total_bytes_buffered -= - hs->buffering.future_record.len; - - mbedtls_free( hs->buffering.future_record.data ); - hs->buffering.future_record.data = NULL; - } -} - -static int ssl_load_buffered_record( mbedtls_ssl_context *ssl ) -{ - mbedtls_ssl_handshake_params * const hs = ssl->handshake; - unsigned char * rec; - size_t rec_len; - unsigned rec_epoch; - - if( ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - return( 0 ); - - if( hs == NULL ) - return( 0 ); - - rec = hs->buffering.future_record.data; - rec_len = hs->buffering.future_record.len; - rec_epoch = hs->buffering.future_record.epoch; - - if( rec == NULL ) - return( 0 ); - - /* Only consider loading future records if the - * input buffer is empty. */ - if( ssl_next_record_is_in_datagram( ssl ) == 1 ) - return( 0 ); - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> ssl_load_buffered_record" ) ); - - if( rec_epoch != ssl->in_epoch ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "Buffered record not from current epoch." ) ); - goto exit; - } - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "Found buffered record from current epoch - load" ) ); - - /* Double-check that the record is not too large */ - if( rec_len > MBEDTLS_SSL_IN_BUFFER_LEN - - (size_t)( ssl->in_hdr - ssl->in_buf ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - - memcpy( ssl->in_hdr, rec, rec_len ); - ssl->in_left = rec_len; - ssl->next_record_offset = 0; - - ssl_free_buffered_record( ssl ); - -exit: - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= ssl_load_buffered_record" ) ); - return( 0 ); -} - -static int ssl_buffer_future_record( mbedtls_ssl_context *ssl, - mbedtls_record const *rec ) -{ - mbedtls_ssl_handshake_params * const hs = ssl->handshake; - - /* Don't buffer future records outside handshakes. */ - if( hs == NULL ) - return( 0 ); - - /* Only buffer handshake records (we are only interested - * in Finished messages). */ - if( rec->type != MBEDTLS_SSL_MSG_HANDSHAKE ) - return( 0 ); - - /* Don't buffer more than one future epoch record. */ - if( hs->buffering.future_record.data != NULL ) - return( 0 ); - - /* Don't buffer record if there's not enough buffering space remaining. */ - if( rec->buf_len > ( MBEDTLS_SSL_DTLS_MAX_BUFFERING - - hs->buffering.total_bytes_buffered ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "Buffering of future epoch record of size %u would exceed the compile-time limit %u (already %u bytes buffered) -- ignore\n", - (unsigned) rec->buf_len, MBEDTLS_SSL_DTLS_MAX_BUFFERING, - (unsigned) hs->buffering.total_bytes_buffered ) ); - return( 0 ); - } - - /* Buffer record */ - MBEDTLS_SSL_DEBUG_MSG( 2, ( "Buffer record from epoch %u", - ssl->in_epoch + 1 ) ); - MBEDTLS_SSL_DEBUG_BUF( 3, "Buffered record", rec->buf, rec->buf_len ); - - /* ssl_parse_record_header() only considers records - * of the next epoch as candidates for buffering. */ - hs->buffering.future_record.epoch = ssl->in_epoch + 1; - hs->buffering.future_record.len = rec->buf_len; - - hs->buffering.future_record.data = - mbedtls_calloc( 1, hs->buffering.future_record.len ); - if( hs->buffering.future_record.data == NULL ) - { - /* If we run out of RAM trying to buffer a - * record from the next epoch, just ignore. */ - return( 0 ); - } - - memcpy( hs->buffering.future_record.data, rec->buf, rec->buf_len ); - - hs->buffering.total_bytes_buffered += rec->buf_len; - return( 0 ); -} - -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - -static int ssl_get_next_record( mbedtls_ssl_context *ssl ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - mbedtls_record rec; - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - /* We might have buffered a future record; if so, - * and if the epoch matches now, load it. - * On success, this call will set ssl->in_left to - * the length of the buffered record, so that - * the calls to ssl_fetch_input() below will - * essentially be no-ops. */ - ret = ssl_load_buffered_record( ssl ); - if( ret != 0 ) - return( ret ); -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - - /* Ensure that we have enough space available for the default form - * of TLS / DTLS record headers (5 Bytes for TLS, 13 Bytes for DTLS, - * with no space for CIDs counted in). */ - ret = mbedtls_ssl_fetch_input( ssl, mbedtls_ssl_in_hdr_len( ssl ) ); - if( ret != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_fetch_input", ret ); - return( ret ); - } - - ret = ssl_parse_record_header( ssl, ssl->in_hdr, ssl->in_left, &rec ); - if( ret != 0 ) - { -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - { - if( ret == MBEDTLS_ERR_SSL_EARLY_MESSAGE ) - { - ret = ssl_buffer_future_record( ssl, &rec ); - if( ret != 0 ) - return( ret ); - - /* Fall through to handling of unexpected records */ - ret = MBEDTLS_ERR_SSL_UNEXPECTED_RECORD; - } - - if( ret == MBEDTLS_ERR_SSL_UNEXPECTED_RECORD ) - { -#if defined(MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE) && defined(MBEDTLS_SSL_SRV_C) - /* Reset in pointers to default state for TLS/DTLS records, - * assuming no CID and no offset between record content and - * record plaintext. */ - mbedtls_ssl_update_in_pointers( ssl ); - - /* Setup internal message pointers from record structure. */ - ssl->in_msgtype = rec.type; -#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) - ssl->in_len = ssl->in_cid + rec.cid_len; -#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ - ssl->in_iv = ssl->in_msg = ssl->in_len + 2; - ssl->in_msglen = rec.data_len; - - ret = ssl_check_client_reconnect( ssl ); - if( ret != 0 ) - return( ret ); -#endif - - /* Skip unexpected record (but not whole datagram) */ - ssl->next_record_offset = rec.buf_len; - - MBEDTLS_SSL_DEBUG_MSG( 1, ( "discarding unexpected record " - "(header)" ) ); - } - else - { - /* Skip invalid record and the rest of the datagram */ - ssl->next_record_offset = 0; - ssl->in_left = 0; - - MBEDTLS_SSL_DEBUG_MSG( 1, ( "discarding invalid record " - "(header)" ) ); - } - - /* Get next record */ - return( MBEDTLS_ERR_SSL_CONTINUE_PROCESSING ); - } - else -#endif - { - return( ret ); - } - } - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - { - /* Remember offset of next record within datagram. */ - ssl->next_record_offset = rec.buf_len; - if( ssl->next_record_offset < ssl->in_left ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "more than one record within datagram" ) ); - } - } - else -#endif - { - /* - * Fetch record contents from underlying transport. - */ - ret = mbedtls_ssl_fetch_input( ssl, rec.buf_len ); - if( ret != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_fetch_input", ret ); - return( ret ); - } - - ssl->in_left = 0; - } - - /* - * Decrypt record contents. - */ - - if( ( ret = ssl_prepare_record_content( ssl, &rec ) ) != 0 ) - { -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - { - /* Silently discard invalid records */ - if( ret == MBEDTLS_ERR_SSL_INVALID_MAC ) - { - /* Except when waiting for Finished as a bad mac here - * probably means something went wrong in the handshake - * (eg wrong psk used, mitm downgrade attempt, etc.) */ - if( ssl->state == MBEDTLS_SSL_CLIENT_FINISHED || - ssl->state == MBEDTLS_SSL_SERVER_FINISHED ) - { -#if defined(MBEDTLS_SSL_ALL_ALERT_MESSAGES) - if( ret == MBEDTLS_ERR_SSL_INVALID_MAC ) - { - mbedtls_ssl_send_alert_message( ssl, - MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_BAD_RECORD_MAC ); - } -#endif - return( ret ); - } - -#if defined(MBEDTLS_SSL_DTLS_BADMAC_LIMIT) - if( ssl->conf->badmac_limit != 0 && - ++ssl->badmac_seen >= ssl->conf->badmac_limit ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "too many records with bad MAC" ) ); - return( MBEDTLS_ERR_SSL_INVALID_MAC ); - } -#endif - - /* As above, invalid records cause - * dismissal of the whole datagram. */ - - ssl->next_record_offset = 0; - ssl->in_left = 0; - - MBEDTLS_SSL_DEBUG_MSG( 1, ( "discarding invalid record (mac)" ) ); - return( MBEDTLS_ERR_SSL_CONTINUE_PROCESSING ); - } - - return( ret ); - } - else -#endif - { - /* Error out (and send alert) on invalid records */ -#if defined(MBEDTLS_SSL_ALL_ALERT_MESSAGES) - if( ret == MBEDTLS_ERR_SSL_INVALID_MAC ) - { - mbedtls_ssl_send_alert_message( ssl, - MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_BAD_RECORD_MAC ); - } -#endif - return( ret ); - } - } - - - /* Reset in pointers to default state for TLS/DTLS records, - * assuming no CID and no offset between record content and - * record plaintext. */ - mbedtls_ssl_update_in_pointers( ssl ); -#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) - ssl->in_len = ssl->in_cid + rec.cid_len; -#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ - ssl->in_iv = ssl->in_len + 2; - - /* The record content type may change during decryption, - * so re-read it. */ - ssl->in_msgtype = rec.type; - /* Also update the input buffer, because unfortunately - * the server-side ssl_parse_client_hello() reparses the - * record header when receiving a ClientHello initiating - * a renegotiation. */ - ssl->in_hdr[0] = rec.type; - ssl->in_msg = rec.buf + rec.data_offset; - ssl->in_msglen = rec.data_len; - ssl->in_len[0] = (unsigned char)( rec.data_len >> 8 ); - ssl->in_len[1] = (unsigned char)( rec.data_len ); - -#if defined(MBEDTLS_ZLIB_SUPPORT) - if( ssl->transform_in != NULL && - ssl->session_in->compression == MBEDTLS_SSL_COMPRESS_DEFLATE ) - { - if( ( ret = ssl_decompress_buf( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "ssl_decompress_buf", ret ); - return( ret ); - } - - /* Check actual (decompress) record content length against - * configured maximum. */ - if( ssl->in_msglen > MBEDTLS_SSL_IN_CONTENT_LEN ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad message length" ) ); - return( MBEDTLS_ERR_SSL_INVALID_RECORD ); - } - } -#endif /* MBEDTLS_ZLIB_SUPPORT */ - - return( 0 ); -} - -int mbedtls_ssl_handle_message_type( mbedtls_ssl_context *ssl ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - - /* - * Handle particular types of records - */ - if( ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE ) - { - if( ( ret = mbedtls_ssl_prepare_handshake_record( ssl ) ) != 0 ) - { - return( ret ); - } - } - - if( ssl->in_msgtype == MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC ) - { - if( ssl->in_msglen != 1 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid CCS message, len: %d", - ssl->in_msglen ) ); - return( MBEDTLS_ERR_SSL_INVALID_RECORD ); - } - - if( ssl->in_msg[0] != 1 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid CCS message, content: %02x", - ssl->in_msg[0] ) ); - return( MBEDTLS_ERR_SSL_INVALID_RECORD ); - } - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && - ssl->state != MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC && - ssl->state != MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC ) - { - if( ssl->handshake == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "dropping ChangeCipherSpec outside handshake" ) ); - return( MBEDTLS_ERR_SSL_UNEXPECTED_RECORD ); - } - - MBEDTLS_SSL_DEBUG_MSG( 1, ( "received out-of-order ChangeCipherSpec - remember" ) ); - return( MBEDTLS_ERR_SSL_EARLY_MESSAGE ); - } -#endif - } - - if( ssl->in_msgtype == MBEDTLS_SSL_MSG_ALERT ) - { - if( ssl->in_msglen != 2 ) - { - /* Note: Standard allows for more than one 2 byte alert - to be packed in a single message, but Mbed TLS doesn't - currently support this. */ - MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid alert message, len: %d", - ssl->in_msglen ) ); - return( MBEDTLS_ERR_SSL_INVALID_RECORD ); - } - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "got an alert message, type: [%d:%d]", - ssl->in_msg[0], ssl->in_msg[1] ) ); - - /* - * Ignore non-fatal alerts, except close_notify and no_renegotiation - */ - if( ssl->in_msg[0] == MBEDTLS_SSL_ALERT_LEVEL_FATAL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "is a fatal alert message (msg %d)", - ssl->in_msg[1] ) ); - return( MBEDTLS_ERR_SSL_FATAL_ALERT_MESSAGE ); - } - - if( ssl->in_msg[0] == MBEDTLS_SSL_ALERT_LEVEL_WARNING && - ssl->in_msg[1] == MBEDTLS_SSL_ALERT_MSG_CLOSE_NOTIFY ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "is a close notify message" ) ); - return( MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY ); - } - -#if defined(MBEDTLS_SSL_RENEGOTIATION_ENABLED) - if( ssl->in_msg[0] == MBEDTLS_SSL_ALERT_LEVEL_WARNING && - ssl->in_msg[1] == MBEDTLS_SSL_ALERT_MSG_NO_RENEGOTIATION ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "is a SSLv3 no renegotiation alert" ) ); - /* Will be handled when trying to parse ServerHello */ - return( 0 ); - } -#endif - -#if defined(MBEDTLS_SSL_PROTO_SSL3) && defined(MBEDTLS_SSL_SRV_C) - if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 && - ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER && - ssl->in_msg[0] == MBEDTLS_SSL_ALERT_LEVEL_WARNING && - ssl->in_msg[1] == MBEDTLS_SSL_ALERT_MSG_NO_CERT ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "is a SSLv3 no_cert" ) ); - /* Will be handled in mbedtls_ssl_parse_certificate() */ - return( 0 ); - } -#endif /* MBEDTLS_SSL_PROTO_SSL3 && MBEDTLS_SSL_SRV_C */ - - /* Silently ignore: fetch new message */ - return MBEDTLS_ERR_SSL_NON_FATAL; - } - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - { - /* Drop unexpected ApplicationData records, - * except at the beginning of renegotiations */ - if( ssl->in_msgtype == MBEDTLS_SSL_MSG_APPLICATION_DATA && - ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER -#if defined(MBEDTLS_SSL_RENEGOTIATION) - && ! ( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS && - ssl->state == MBEDTLS_SSL_SERVER_HELLO ) -#endif - ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "dropping unexpected ApplicationData" ) ); - return( MBEDTLS_ERR_SSL_NON_FATAL ); - } - - if( ssl->handshake != NULL && - ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER ) - { - mbedtls_ssl_handshake_wrapup_free_hs_transform( ssl ); - } - } -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - - return( 0 ); -} - -int mbedtls_ssl_send_fatal_handshake_failure( mbedtls_ssl_context *ssl ) -{ - return( mbedtls_ssl_send_alert_message( ssl, - MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ) ); -} - -int mbedtls_ssl_send_alert_message( mbedtls_ssl_context *ssl, - unsigned char level, - unsigned char message ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - - if( ssl == NULL || ssl->conf == NULL ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> send alert message" ) ); - MBEDTLS_SSL_DEBUG_MSG( 3, ( "send alert level=%u message=%u", level, message )); - - ssl->out_msgtype = MBEDTLS_SSL_MSG_ALERT; - ssl->out_msglen = 2; - ssl->out_msg[0] = level; - ssl->out_msg[1] = message; - - if( ( ret = mbedtls_ssl_write_record( ssl, SSL_FORCE_FLUSH ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret ); - return( ret ); - } - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= send alert message" ) ); - - return( 0 ); -} - #if defined(MBEDTLS_X509_CRT_PARSE_C) static void ssl_clear_peer_cert( mbedtls_ssl_session *session ) { @@ -7472,102 +2870,6 @@ exit: } #endif /* MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */ -int mbedtls_ssl_write_change_cipher_spec( mbedtls_ssl_context *ssl ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write change cipher spec" ) ); - - ssl->out_msgtype = MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC; - ssl->out_msglen = 1; - ssl->out_msg[0] = 1; - - ssl->state++; - - if( ( ret = mbedtls_ssl_write_handshake_msg( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_handshake_msg", ret ); - return( ret ); - } - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write change cipher spec" ) ); - - return( 0 ); -} - -int mbedtls_ssl_parse_change_cipher_spec( mbedtls_ssl_context *ssl ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse change cipher spec" ) ); - - if( ( ret = mbedtls_ssl_read_record( ssl, 1 ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret ); - return( ret ); - } - - if( ssl->in_msgtype != MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad change cipher spec message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE ); - return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE ); - } - - /* CCS records are only accepted if they have length 1 and content '1', - * so we don't need to check this here. */ - - /* - * Switch to our negotiated transform and session parameters for inbound - * data. - */ - MBEDTLS_SSL_DEBUG_MSG( 3, ( "switching to new transform spec for inbound data" ) ); - ssl->transform_in = ssl->transform_negotiate; - ssl->session_in = ssl->session_negotiate; - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - { -#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY) - mbedtls_ssl_dtls_replay_reset( ssl ); -#endif - - /* Increment epoch */ - if( ++ssl->in_epoch == 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "DTLS epoch would wrap" ) ); - /* This is highly unlikely to happen for legitimate reasons, so - treat it as an attack and don't send an alert. */ - return( MBEDTLS_ERR_SSL_COUNTER_WRAPPING ); - } - } - else -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - memset( ssl->in_ctr, 0, 8 ); - - mbedtls_ssl_update_in_pointers( ssl ); - -#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL) - if( mbedtls_ssl_hw_record_activate != NULL ) - { - if( ( ret = mbedtls_ssl_hw_record_activate( ssl, MBEDTLS_SSL_CHANNEL_INBOUND ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_activate", ret ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR ); - return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED ); - } - } -#endif - - ssl->state++; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse change cipher spec" ) ); - - return( 0 ); -} - void mbedtls_ssl_optimize_checksum( mbedtls_ssl_context *ssl, const mbedtls_ssl_ciphersuite_t *ciphersuite_info ) { @@ -8456,103 +3758,6 @@ static int ssl_cookie_check_dummy( void *ctx, } #endif /* MBEDTLS_SSL_DTLS_HELLO_VERIFY && MBEDTLS_SSL_SRV_C */ -/* Once ssl->out_hdr as the address of the beginning of the - * next outgoing record is set, deduce the other pointers. - * - * Note: For TLS, we save the implicit record sequence number - * (entering MAC computation) in the 8 bytes before ssl->out_hdr, - * and the caller has to make sure there's space for this. - */ - -void mbedtls_ssl_update_out_pointers( mbedtls_ssl_context *ssl, - mbedtls_ssl_transform *transform ) -{ -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - { - ssl->out_ctr = ssl->out_hdr + 3; -#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) - ssl->out_cid = ssl->out_ctr + 8; - ssl->out_len = ssl->out_cid; - if( transform != NULL ) - ssl->out_len += transform->out_cid_len; -#else /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ - ssl->out_len = ssl->out_ctr + 8; -#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ - ssl->out_iv = ssl->out_len + 2; - } - else -#endif - { - ssl->out_ctr = ssl->out_hdr - 8; - ssl->out_len = ssl->out_hdr + 3; -#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) - ssl->out_cid = ssl->out_len; -#endif - ssl->out_iv = ssl->out_hdr + 5; - } - - /* Adjust out_msg to make space for explicit IV, if used. */ - if( transform != NULL && - ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_2 ) - { - ssl->out_msg = ssl->out_iv + transform->ivlen - transform->fixed_ivlen; - } - else - ssl->out_msg = ssl->out_iv; -} - -/* Once ssl->in_hdr as the address of the beginning of the - * next incoming record is set, deduce the other pointers. - * - * Note: For TLS, we save the implicit record sequence number - * (entering MAC computation) in the 8 bytes before ssl->in_hdr, - * and the caller has to make sure there's space for this. - */ - -void mbedtls_ssl_update_in_pointers( mbedtls_ssl_context *ssl ) -{ - /* This function sets the pointers to match the case - * of unprotected TLS/DTLS records, with both ssl->in_iv - * and ssl->in_msg pointing to the beginning of the record - * content. - * - * When decrypting a protected record, ssl->in_msg - * will be shifted to point to the beginning of the - * record plaintext. - */ - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - { - /* This sets the header pointers to match records - * without CID. When we receive a record containing - * a CID, the fields are shifted accordingly in - * ssl_parse_record_header(). */ - ssl->in_ctr = ssl->in_hdr + 3; -#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) - ssl->in_cid = ssl->in_ctr + 8; - ssl->in_len = ssl->in_cid; /* Default: no CID */ -#else /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ - ssl->in_len = ssl->in_ctr + 8; -#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ - ssl->in_iv = ssl->in_len + 2; - } - else -#endif - { - ssl->in_ctr = ssl->in_hdr - 8; - ssl->in_len = ssl->in_hdr + 3; -#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) - ssl->in_cid = ssl->in_len; -#endif - ssl->in_iv = ssl->in_hdr + 5; - } - - /* This will be adjusted at record decryption time. */ - ssl->in_msg = ssl->in_iv; -} - /* * Initialize an SSL context */ @@ -8565,27 +3770,6 @@ void mbedtls_ssl_init( mbedtls_ssl_context *ssl ) * Setup an SSL context */ -void mbedtls_ssl_reset_in_out_pointers( mbedtls_ssl_context *ssl ) -{ - /* Set the incoming and outgoing record pointers. */ -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - { - ssl->out_hdr = ssl->out_buf; - ssl->in_hdr = ssl->in_buf; - } - else -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - { - ssl->out_hdr = ssl->out_buf + 8; - ssl->in_hdr = ssl->in_buf + 8; - } - - /* Derive other internal pointers. */ - mbedtls_ssl_update_out_pointers( ssl, NULL /* no transform enabled */ ); - mbedtls_ssl_update_in_pointers ( ssl ); -} - int mbedtls_ssl_setup( mbedtls_ssl_context *ssl, const mbedtls_ssl_config *conf ) { @@ -9610,66 +4794,6 @@ void mbedtls_ssl_set_async_operation_data( mbedtls_ssl_context *ssl, /* * SSL get accessors */ -size_t mbedtls_ssl_get_bytes_avail( const mbedtls_ssl_context *ssl ) -{ - return( ssl->in_offt == NULL ? 0 : ssl->in_msglen ); -} - -int mbedtls_ssl_check_pending( const mbedtls_ssl_context *ssl ) -{ - /* - * Case A: We're currently holding back - * a message for further processing. - */ - - if( ssl->keep_current_message == 1 ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "ssl_check_pending: record held back for processing" ) ); - return( 1 ); - } - - /* - * Case B: Further records are pending in the current datagram. - */ - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && - ssl->in_left > ssl->next_record_offset ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "ssl_check_pending: more records within current datagram" ) ); - return( 1 ); - } -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - - /* - * Case C: A handshake message is being processed. - */ - - if( ssl->in_hslen > 0 && ssl->in_hslen < ssl->in_msglen ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "ssl_check_pending: more handshake messages within current record" ) ); - return( 1 ); - } - - /* - * Case D: An application data message is being processed - */ - if( ssl->in_offt != NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "ssl_check_pending: application data record is being processed" ) ); - return( 1 ); - } - - /* - * In all other cases, the rest of the message can be dropped. - * As in ssl_get_next_record, this needs to be adapted if - * we implement support for multiple alerts in single records. - */ - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "ssl_check_pending: nothing pending" ) ); - return( 0 ); -} - uint32_t mbedtls_ssl_get_verify_result( const mbedtls_ssl_context *ssl ) { if( ssl->session != NULL ) @@ -9727,66 +4851,6 @@ const char *mbedtls_ssl_get_version( const mbedtls_ssl_context *ssl ) } } -int mbedtls_ssl_get_record_expansion( const mbedtls_ssl_context *ssl ) -{ - size_t transform_expansion = 0; - const mbedtls_ssl_transform *transform = ssl->transform_out; - unsigned block_size; - - size_t out_hdr_len = mbedtls_ssl_out_hdr_len( ssl ); - - if( transform == NULL ) - return( (int) out_hdr_len ); - -#if defined(MBEDTLS_ZLIB_SUPPORT) - if( ssl->session_out->compression != MBEDTLS_SSL_COMPRESS_NULL ) - return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE ); -#endif - - switch( mbedtls_cipher_get_cipher_mode( &transform->cipher_ctx_enc ) ) - { - case MBEDTLS_MODE_GCM: - case MBEDTLS_MODE_CCM: - case MBEDTLS_MODE_CHACHAPOLY: - case MBEDTLS_MODE_STREAM: - transform_expansion = transform->minlen; - break; - - case MBEDTLS_MODE_CBC: - - block_size = mbedtls_cipher_get_block_size( - &transform->cipher_ctx_enc ); - - /* Expansion due to the addition of the MAC. */ - transform_expansion += transform->maclen; - - /* Expansion due to the addition of CBC padding; - * Theoretically up to 256 bytes, but we never use - * more than the block size of the underlying cipher. */ - transform_expansion += block_size; - - /* For TLS 1.1 or higher, an explicit IV is added - * after the record header. */ -#if defined(MBEDTLS_SSL_PROTO_TLS1_1) || defined(MBEDTLS_SSL_PROTO_TLS1_2) - if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_2 ) - transform_expansion += block_size; -#endif /* MBEDTLS_SSL_PROTO_TLS1_1 || MBEDTLS_SSL_PROTO_TLS1_2 */ - - break; - - default: - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - -#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) - if( transform->out_cid_len != 0 ) - transform_expansion += MBEDTLS_SSL_MAX_CID_EXPANSION; -#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ - - return( (int)( out_hdr_len + transform_expansion ) ); -} - #if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) size_t mbedtls_ssl_get_max_frag_len( const mbedtls_ssl_context *ssl ) { @@ -10652,548 +5716,8 @@ int mbedtls_ssl_renegotiate( mbedtls_ssl_context *ssl ) return( ret ); } - -/* - * Check record counters and renegotiate if they're above the limit. - */ -static int ssl_check_ctr_renegotiate( mbedtls_ssl_context *ssl ) -{ - size_t ep_len = mbedtls_ssl_ep_len( ssl ); - int in_ctr_cmp; - int out_ctr_cmp; - - if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER || - ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_PENDING || - ssl->conf->disable_renegotiation == MBEDTLS_SSL_RENEGOTIATION_DISABLED ) - { - return( 0 ); - } - - in_ctr_cmp = memcmp( ssl->in_ctr + ep_len, - ssl->conf->renego_period + ep_len, 8 - ep_len ); - out_ctr_cmp = memcmp( ssl->cur_out_ctr + ep_len, - ssl->conf->renego_period + ep_len, 8 - ep_len ); - - if( in_ctr_cmp <= 0 && out_ctr_cmp <= 0 ) - { - return( 0 ); - } - - MBEDTLS_SSL_DEBUG_MSG( 1, ( "record counter limit reached: renegotiate" ) ); - return( mbedtls_ssl_renegotiate( ssl ) ); -} #endif /* MBEDTLS_SSL_RENEGOTIATION */ -/* - * Receive application data decrypted from the SSL layer - */ -int mbedtls_ssl_read( mbedtls_ssl_context *ssl, unsigned char *buf, size_t len ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - size_t n; - - if( ssl == NULL || ssl->conf == NULL ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> read" ) ); - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - { - if( ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 ) - return( ret ); - - if( ssl->handshake != NULL && - ssl->handshake->retransmit_state == MBEDTLS_SSL_RETRANS_SENDING ) - { - if( ( ret = mbedtls_ssl_flight_transmit( ssl ) ) != 0 ) - return( ret ); - } - } -#endif - - /* - * Check if renegotiation is necessary and/or handshake is - * in process. If yes, perform/continue, and fall through - * if an unexpected packet is received while the client - * is waiting for the ServerHello. - * - * (There is no equivalent to the last condition on - * the server-side as it is not treated as within - * a handshake while waiting for the ClientHello - * after a renegotiation request.) - */ - -#if defined(MBEDTLS_SSL_RENEGOTIATION) - ret = ssl_check_ctr_renegotiate( ssl ); - if( ret != MBEDTLS_ERR_SSL_WAITING_SERVER_HELLO_RENEGO && - ret != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "ssl_check_ctr_renegotiate", ret ); - return( ret ); - } -#endif - - if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER ) - { - ret = mbedtls_ssl_handshake( ssl ); - if( ret != MBEDTLS_ERR_SSL_WAITING_SERVER_HELLO_RENEGO && - ret != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_handshake", ret ); - return( ret ); - } - } - - /* Loop as long as no application data record is available */ - while( ssl->in_offt == NULL ) - { - /* Start timer if not already running */ - if( ssl->f_get_timer != NULL && - ssl->f_get_timer( ssl->p_timer ) == -1 ) - { - mbedtls_ssl_set_timer( ssl, ssl->conf->read_timeout ); - } - - if( ( ret = mbedtls_ssl_read_record( ssl, 1 ) ) != 0 ) - { - if( ret == MBEDTLS_ERR_SSL_CONN_EOF ) - return( 0 ); - - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret ); - return( ret ); - } - - if( ssl->in_msglen == 0 && - ssl->in_msgtype == MBEDTLS_SSL_MSG_APPLICATION_DATA ) - { - /* - * OpenSSL sends empty messages to randomize the IV - */ - if( ( ret = mbedtls_ssl_read_record( ssl, 1 ) ) != 0 ) - { - if( ret == MBEDTLS_ERR_SSL_CONN_EOF ) - return( 0 ); - - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret ); - return( ret ); - } - } - - if( ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "received handshake message" ) ); - - /* - * - For client-side, expect SERVER_HELLO_REQUEST. - * - For server-side, expect CLIENT_HELLO. - * - Fail (TLS) or silently drop record (DTLS) in other cases. - */ - -#if defined(MBEDTLS_SSL_CLI_C) - if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT && - ( ssl->in_msg[0] != MBEDTLS_SSL_HS_HELLO_REQUEST || - ssl->in_hslen != mbedtls_ssl_hs_hdr_len( ssl ) ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "handshake received (not HelloRequest)" ) ); - - /* With DTLS, drop the packet (probably from last handshake) */ -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - { - continue; - } -#endif - return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE ); - } -#endif /* MBEDTLS_SSL_CLI_C */ - -#if defined(MBEDTLS_SSL_SRV_C) - if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER && - ssl->in_msg[0] != MBEDTLS_SSL_HS_CLIENT_HELLO ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "handshake received (not ClientHello)" ) ); - - /* With DTLS, drop the packet (probably from last handshake) */ -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - { - continue; - } -#endif - return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE ); - } -#endif /* MBEDTLS_SSL_SRV_C */ - -#if defined(MBEDTLS_SSL_RENEGOTIATION) - /* Determine whether renegotiation attempt should be accepted */ - if( ! ( ssl->conf->disable_renegotiation == MBEDTLS_SSL_RENEGOTIATION_DISABLED || - ( ssl->secure_renegotiation == MBEDTLS_SSL_LEGACY_RENEGOTIATION && - ssl->conf->allow_legacy_renegotiation == - MBEDTLS_SSL_LEGACY_NO_RENEGOTIATION ) ) ) - { - /* - * Accept renegotiation request - */ - - /* DTLS clients need to know renego is server-initiated */ -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && - ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT ) - { - ssl->renego_status = MBEDTLS_SSL_RENEGOTIATION_PENDING; - } -#endif - ret = mbedtls_ssl_start_renegotiation( ssl ); - if( ret != MBEDTLS_ERR_SSL_WAITING_SERVER_HELLO_RENEGO && - ret != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_start_renegotiation", - ret ); - return( ret ); - } - } - else -#endif /* MBEDTLS_SSL_RENEGOTIATION */ - { - /* - * Refuse renegotiation - */ - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "refusing renegotiation, sending alert" ) ); - -#if defined(MBEDTLS_SSL_PROTO_SSL3) - if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) - { - /* SSLv3 does not have a "no_renegotiation" warning, so - we send a fatal alert and abort the connection. */ - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE ); - return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE ); - } - else -#endif /* MBEDTLS_SSL_PROTO_SSL3 */ -#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \ - defined(MBEDTLS_SSL_PROTO_TLS1_2) - if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_1 ) - { - if( ( ret = mbedtls_ssl_send_alert_message( ssl, - MBEDTLS_SSL_ALERT_LEVEL_WARNING, - MBEDTLS_SSL_ALERT_MSG_NO_RENEGOTIATION ) ) != 0 ) - { - return( ret ); - } - } - else -#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 || - MBEDTLS_SSL_PROTO_TLS1_2 */ - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - } - - /* At this point, we don't know whether the renegotiation has been - * completed or not. The cases to consider are the following: - * 1) The renegotiation is complete. In this case, no new record - * has been read yet. - * 2) The renegotiation is incomplete because the client received - * an application data record while awaiting the ServerHello. - * 3) The renegotiation is incomplete because the client received - * a non-handshake, non-application data message while awaiting - * the ServerHello. - * In each of these case, looping will be the proper action: - * - For 1), the next iteration will read a new record and check - * if it's application data. - * - For 2), the loop condition isn't satisfied as application data - * is present, hence continue is the same as break - * - For 3), the loop condition is satisfied and read_record - * will re-deliver the message that was held back by the client - * when expecting the ServerHello. - */ - continue; - } -#if defined(MBEDTLS_SSL_RENEGOTIATION) - else if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_PENDING ) - { - if( ssl->conf->renego_max_records >= 0 ) - { - if( ++ssl->renego_records_seen > ssl->conf->renego_max_records ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "renegotiation requested, " - "but not honored by client" ) ); - return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE ); - } - } - } -#endif /* MBEDTLS_SSL_RENEGOTIATION */ - - /* Fatal and closure alerts handled by mbedtls_ssl_read_record() */ - if( ssl->in_msgtype == MBEDTLS_SSL_MSG_ALERT ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "ignoring non-fatal non-closure alert" ) ); - return( MBEDTLS_ERR_SSL_WANT_READ ); - } - - if( ssl->in_msgtype != MBEDTLS_SSL_MSG_APPLICATION_DATA ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad application data message" ) ); - return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE ); - } - - ssl->in_offt = ssl->in_msg; - - /* We're going to return something now, cancel timer, - * except if handshake (renegotiation) is in progress */ - if( ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER ) - mbedtls_ssl_set_timer( ssl, 0 ); - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - /* If we requested renego but received AppData, resend HelloRequest. - * Do it now, after setting in_offt, to avoid taking this branch - * again if ssl_write_hello_request() returns WANT_WRITE */ -#if defined(MBEDTLS_SSL_SRV_C) && defined(MBEDTLS_SSL_RENEGOTIATION) - if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER && - ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_PENDING ) - { - if( ( ret = mbedtls_ssl_resend_hello_request( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_resend_hello_request", - ret ); - return( ret ); - } - } -#endif /* MBEDTLS_SSL_SRV_C && MBEDTLS_SSL_RENEGOTIATION */ -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - } - - n = ( len < ssl->in_msglen ) - ? len : ssl->in_msglen; - - memcpy( buf, ssl->in_offt, n ); - ssl->in_msglen -= n; - - if( ssl->in_msglen == 0 ) - { - /* all bytes consumed */ - ssl->in_offt = NULL; - ssl->keep_current_message = 0; - } - else - { - /* more data available */ - ssl->in_offt += n; - } - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= read" ) ); - - return( (int) n ); -} - -/* - * Send application data to be encrypted by the SSL layer, taking care of max - * fragment length and buffer size. - * - * According to RFC 5246 Section 6.2.1: - * - * Zero-length fragments of Application data MAY be sent as they are - * potentially useful as a traffic analysis countermeasure. - * - * Therefore, it is possible that the input message length is 0 and the - * corresponding return code is 0 on success. - */ -static int ssl_write_real( mbedtls_ssl_context *ssl, - const unsigned char *buf, size_t len ) -{ - int ret = mbedtls_ssl_get_max_out_record_payload( ssl ); - const size_t max_len = (size_t) ret; - - if( ret < 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_get_max_out_record_payload", ret ); - return( ret ); - } - - if( len > max_len ) - { -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "fragment larger than the (negotiated) " - "maximum fragment length: %d > %d", - len, max_len ) ); - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - else -#endif - len = max_len; - } - - if( ssl->out_left != 0 ) - { - /* - * The user has previously tried to send the data and - * MBEDTLS_ERR_SSL_WANT_WRITE or the message was only partially - * written. In this case, we expect the high-level write function - * (e.g. mbedtls_ssl_write()) to be called with the same parameters - */ - if( ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_flush_output", ret ); - return( ret ); - } - } - else - { - /* - * The user is trying to send a message the first time, so we need to - * copy the data into the internal buffers and setup the data structure - * to keep track of partial writes - */ - ssl->out_msglen = len; - ssl->out_msgtype = MBEDTLS_SSL_MSG_APPLICATION_DATA; - memcpy( ssl->out_msg, buf, len ); - - if( ( ret = mbedtls_ssl_write_record( ssl, SSL_FORCE_FLUSH ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret ); - return( ret ); - } - } - - return( (int) len ); -} - -/* - * Write application data, doing 1/n-1 splitting if necessary. - * - * With non-blocking I/O, ssl_write_real() may return WANT_WRITE, - * then the caller will call us again with the same arguments, so - * remember whether we already did the split or not. - */ -#if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING) -static int ssl_write_split( mbedtls_ssl_context *ssl, - const unsigned char *buf, size_t len ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - - if( ssl->conf->cbc_record_splitting == - MBEDTLS_SSL_CBC_RECORD_SPLITTING_DISABLED || - len <= 1 || - ssl->minor_ver > MBEDTLS_SSL_MINOR_VERSION_1 || - mbedtls_cipher_get_cipher_mode( &ssl->transform_out->cipher_ctx_enc ) - != MBEDTLS_MODE_CBC ) - { - return( ssl_write_real( ssl, buf, len ) ); - } - - if( ssl->split_done == 0 ) - { - if( ( ret = ssl_write_real( ssl, buf, 1 ) ) <= 0 ) - return( ret ); - ssl->split_done = 1; - } - - if( ( ret = ssl_write_real( ssl, buf + 1, len - 1 ) ) <= 0 ) - return( ret ); - ssl->split_done = 0; - - return( ret + 1 ); -} -#endif /* MBEDTLS_SSL_CBC_RECORD_SPLITTING */ - -/* - * Write application data (public-facing wrapper) - */ -int mbedtls_ssl_write( mbedtls_ssl_context *ssl, const unsigned char *buf, size_t len ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write" ) ); - - if( ssl == NULL || ssl->conf == NULL ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - -#if defined(MBEDTLS_SSL_RENEGOTIATION) - if( ( ret = ssl_check_ctr_renegotiate( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "ssl_check_ctr_renegotiate", ret ); - return( ret ); - } -#endif - - if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER ) - { - if( ( ret = mbedtls_ssl_handshake( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_handshake", ret ); - return( ret ); - } - } - -#if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING) - ret = ssl_write_split( ssl, buf, len ); -#else - ret = ssl_write_real( ssl, buf, len ); -#endif - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write" ) ); - - return( ret ); -} - -/* - * Notify the peer that the connection is being closed - */ -int mbedtls_ssl_close_notify( mbedtls_ssl_context *ssl ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - - if( ssl == NULL || ssl->conf == NULL ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write close notify" ) ); - - if( ssl->out_left != 0 ) - return( mbedtls_ssl_flush_output( ssl ) ); - - if( ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER ) - { - if( ( ret = mbedtls_ssl_send_alert_message( ssl, - MBEDTLS_SSL_ALERT_LEVEL_WARNING, - MBEDTLS_SSL_ALERT_MSG_CLOSE_NOTIFY ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_send_alert_message", ret ); - return( ret ); - } - } - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write close notify" ) ); - - return( 0 ); -} - -void mbedtls_ssl_transform_free( mbedtls_ssl_transform *transform ) -{ - if( transform == NULL ) - return; - -#if defined(MBEDTLS_ZLIB_SUPPORT) - deflateEnd( &transform->ctx_deflate ); - inflateEnd( &transform->ctx_inflate ); -#endif - - mbedtls_cipher_free( &transform->cipher_ctx_enc ); - mbedtls_cipher_free( &transform->cipher_ctx_dec ); - -#if defined(MBEDTLS_SSL_SOME_MODES_USE_MAC) - mbedtls_md_free( &transform->md_ctx_enc ); - mbedtls_md_free( &transform->md_ctx_dec ); -#endif - - mbedtls_platform_zeroize( transform, sizeof( mbedtls_ssl_transform ) ); -} - #if defined(MBEDTLS_X509_CRT_PARSE_C) static void ssl_key_cert_free( mbedtls_ssl_key_cert *key_cert ) { @@ -11208,42 +5732,6 @@ static void ssl_key_cert_free( mbedtls_ssl_key_cert *key_cert ) } #endif /* MBEDTLS_X509_CRT_PARSE_C */ -#if defined(MBEDTLS_SSL_PROTO_DTLS) - -void mbedtls_ssl_buffering_free( mbedtls_ssl_context *ssl ) -{ - unsigned offset; - mbedtls_ssl_handshake_params * const hs = ssl->handshake; - - if( hs == NULL ) - return; - - ssl_free_buffered_record( ssl ); - - for( offset = 0; offset < MBEDTLS_SSL_MAX_BUFFERED_HS; offset++ ) - ssl_buffering_free_slot( ssl, offset ); -} - -static void ssl_buffering_free_slot( mbedtls_ssl_context *ssl, - uint8_t slot ) -{ - mbedtls_ssl_handshake_params * const hs = ssl->handshake; - mbedtls_ssl_hs_buffer * const hs_buf = &hs->buffering.hs[slot]; - - if( slot >= MBEDTLS_SSL_MAX_BUFFERED_HS ) - return; - - if( hs_buf->is_valid == 1 ) - { - hs->buffering.total_bytes_buffered -= hs_buf->data_len; - mbedtls_platform_zeroize( hs_buf->data, hs_buf->data_len ); - mbedtls_free( hs_buf->data ); - memset( hs_buf, 0, sizeof( mbedtls_ssl_hs_buffer ) ); - } -} - -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - void mbedtls_ssl_handshake_free( mbedtls_ssl_context *ssl ) { mbedtls_ssl_handshake_params *handshake = ssl->handshake; @@ -12640,59 +7128,6 @@ int mbedtls_ssl_check_cert_usage( const mbedtls_x509_crt *cert, } #endif /* MBEDTLS_X509_CRT_PARSE_C */ -/* - * Convert version numbers to/from wire format - * and, for DTLS, to/from TLS equivalent. - * - * For TLS this is the identity. - * For DTLS, use 1's complement (v -> 255 - v, and then map as follows: - * 1.0 <-> 3.2 (DTLS 1.0 is based on TLS 1.1) - * 1.x <-> 3.x+1 for x != 0 (DTLS 1.2 based on TLS 1.2) - */ -void mbedtls_ssl_write_version( int major, int minor, int transport, - unsigned char ver[2] ) -{ -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - { - if( minor == MBEDTLS_SSL_MINOR_VERSION_2 ) - --minor; /* DTLS 1.0 stored as TLS 1.1 internally */ - - ver[0] = (unsigned char)( 255 - ( major - 2 ) ); - ver[1] = (unsigned char)( 255 - ( minor - 1 ) ); - } - else -#else - ((void) transport); -#endif - { - ver[0] = (unsigned char) major; - ver[1] = (unsigned char) minor; - } -} - -void mbedtls_ssl_read_version( int *major, int *minor, int transport, - const unsigned char ver[2] ) -{ -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - { - *major = 255 - ver[0] + 2; - *minor = 255 - ver[1] + 1; - - if( *minor == MBEDTLS_SSL_MINOR_VERSION_1 ) - ++*minor; /* DTLS 1.0 stored as TLS 1.1 internally */ - } - else -#else - ((void) transport); -#endif - { - *major = ver[0]; - *minor = ver[1]; - } -} - int mbedtls_ssl_set_calc_verify_md( mbedtls_ssl_context *ssl, int md ) { #if defined(MBEDTLS_SSL_PROTO_TLS1_2)