mirror of
https://github.com/Mbed-TLS/mbedtls.git
synced 2025-03-29 04:20:12 +00:00
Add TLS1.3 process certificate request
Signed-off-by: Xiaofei Bai <xiaofei.bai@arm.com>
This commit is contained in:
Xiaofei Bai
parent
f51b79c297
commit
e1e344213a
@ -556,6 +556,13 @@ struct mbedtls_ssl_handshake_params
|
||||
#if defined(MBEDTLS_SSL_PROTO_DTLS)
|
||||
unsigned char retransmit_state; /*!< Retransmission state */
|
||||
#endif
|
||||
/*
|
||||
* Handshake specific crypto variables
|
||||
*/
|
||||
#if defined(MBEDTLS_X509_CRT_PARSE_C)
|
||||
int recv_sig_schemes_list[MBEDTLS_PK_SIGNATURE_MAX_SIZE];
|
||||
/*!< Received signature algorithms */
|
||||
#endif /* MBEDTLS_X509_CRT_PARSE_C */
|
||||
|
||||
#if !defined(MBEDTLS_DEPRECATED_REMOVED)
|
||||
unsigned char group_list_heap_allocated;
|
||||
@ -802,6 +809,12 @@ struct mbedtls_ssl_handshake_params
|
||||
represents an extension and defined
|
||||
as \c MBEDTLS_SSL_EXT_XXX */
|
||||
|
||||
#if defined(MBEDTLS_ECDSA_C)
|
||||
unsigned char cert_req_ctx_len; /*!< certificate request context
|
||||
length */
|
||||
unsigned char* cert_req_ctx; /*!< certificate request context */
|
||||
#endif
|
||||
|
||||
union
|
||||
{
|
||||
unsigned char early [MBEDTLS_TLS1_3_MD_MAX_SIZE];
|
||||
@ -1687,6 +1700,11 @@ int mbedtls_ssl_tls13_start_handshake_msg( mbedtls_ssl_context *ssl,
|
||||
unsigned char **buf,
|
||||
size_t *buf_len );
|
||||
|
||||
/*
|
||||
* Handler of TLS 1.3 server certificate request message
|
||||
*/
|
||||
int mbedtls_ssl_tls13_process_certificate_request( mbedtls_ssl_context *ssl );
|
||||
|
||||
/*
|
||||
* Handler of TLS 1.3 server certificate message
|
||||
*/
|
||||
|
||||
@ -1415,10 +1415,9 @@ static int ssl_tls13_process_certificate_request( mbedtls_ssl_context *ssl )
|
||||
if( ( ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE ) &&
|
||||
( ssl->in_msg[0] == MBEDTLS_SSL_HS_CERTIFICATE_REQUEST ) )
|
||||
{
|
||||
MBEDTLS_SSL_DEBUG_MSG( 1, ( "CertificateRequest not supported" ) );
|
||||
MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE,
|
||||
MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE );
|
||||
return( MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE );
|
||||
ret = mbedtls_ssl_tls13_process_certificate_request( ssl );
|
||||
if( ret != 0 )
|
||||
return( ret );
|
||||
}
|
||||
|
||||
ssl->keep_current_message = 1;
|
||||
|
||||
@ -136,6 +136,379 @@ void mbedtls_ssl_tls13_add_hs_hdr_to_checksum( mbedtls_ssl_context *ssl,
|
||||
}
|
||||
|
||||
#if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
|
||||
|
||||
/*
|
||||
* mbedtls_ssl_tls13_write_sig_alg_ext( )
|
||||
*
|
||||
* enum {
|
||||
* ....
|
||||
* ecdsa_secp256r1_sha256( 0x0403 ),
|
||||
* ecdsa_secp384r1_sha384( 0x0503 ),
|
||||
* ecdsa_secp521r1_sha512( 0x0603 ),
|
||||
* ....
|
||||
* } SignatureScheme;
|
||||
*
|
||||
* struct {
|
||||
* SignatureScheme supported_signature_algorithms<2..2^16-2>;
|
||||
* } SignatureSchemeList;
|
||||
*
|
||||
* Only if we handle at least one key exchange that needs signatures.
|
||||
*/
|
||||
int mbedtls_ssl_tls13_write_sig_alg_ext( mbedtls_ssl_context *ssl,
|
||||
unsigned char *buf,
|
||||
unsigned char *end,
|
||||
size_t *out_len )
|
||||
{
|
||||
unsigned char *p = buf;
|
||||
unsigned char *supported_sig_alg; /* Start of supported_signature_algorithms */
|
||||
size_t supported_sig_alg_len = 0; /* Length of supported_signature_algorithms */
|
||||
|
||||
*out_len = 0;
|
||||
|
||||
/* Skip the extension on the client if all allowed key exchanges
|
||||
* are PSK-based. */
|
||||
#if defined(MBEDTLS_SSL_CLI_C)
|
||||
if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT &&
|
||||
!mbedtls_ssl_conf_tls13_some_ephemeral_enabled( ssl ) )
|
||||
{
|
||||
return( 0 );
|
||||
}
|
||||
#endif /* MBEDTLS_SSL_CLI_C */
|
||||
|
||||
MBEDTLS_SSL_DEBUG_MSG( 3, ( "adding signature_algorithms extension" ) );
|
||||
|
||||
/* Check if we have space for header and length field:
|
||||
* - extension_type (2 bytes)
|
||||
* - extension_data_length (2 bytes)
|
||||
* - supported_signature_algorithms_length (2 bytes)
|
||||
*/
|
||||
MBEDTLS_SSL_CHK_BUF_PTR( p, end, 6 );
|
||||
p += 6;
|
||||
|
||||
/*
|
||||
* Write supported_signature_algorithms
|
||||
*/
|
||||
supported_sig_alg = p;
|
||||
for( const uint16_t *sig_alg = ssl->conf->tls13_sig_algs;
|
||||
*sig_alg != MBEDTLS_TLS1_3_SIG_NONE; sig_alg++ )
|
||||
{
|
||||
MBEDTLS_SSL_CHK_BUF_PTR( p, end, 2 );
|
||||
MBEDTLS_PUT_UINT16_BE( *sig_alg, p, 0 );
|
||||
p += 2;
|
||||
MBEDTLS_SSL_DEBUG_MSG( 3, ( "signature scheme [%x]", *sig_alg ) );
|
||||
}
|
||||
|
||||
/* Length of supported_signature_algorithms */
|
||||
supported_sig_alg_len = p - supported_sig_alg;
|
||||
if( supported_sig_alg_len == 0 )
|
||||
{
|
||||
MBEDTLS_SSL_DEBUG_MSG( 1, ( "No signature algorithms defined." ) );
|
||||
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
||||
}
|
||||
|
||||
/* Write extension_type */
|
||||
MBEDTLS_PUT_UINT16_BE( MBEDTLS_TLS_EXT_SIG_ALG, buf, 0 );
|
||||
/* Write extension_data_length */
|
||||
MBEDTLS_PUT_UINT16_BE( supported_sig_alg_len + 2, buf, 2 );
|
||||
/* Write length of supported_signature_algorithms */
|
||||
MBEDTLS_PUT_UINT16_BE( supported_sig_alg_len, buf, 4 );
|
||||
|
||||
/* Output the total length of signature algorithms extension. */
|
||||
*out_len = p - buf;
|
||||
|
||||
ssl->handshake->extensions_present |= MBEDTLS_SSL_EXT_SIG_ALG;
|
||||
return( 0 );
|
||||
}
|
||||
|
||||
#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED)
|
||||
static int ssl_tls13_parse_signature_algorithms_ext( mbedtls_ssl_context *ssl,
|
||||
const unsigned char *buf,
|
||||
const unsigned char *end )
|
||||
{
|
||||
size_t sig_alg_list_size; /* size of receive signature algorithms list */
|
||||
const unsigned char *p; /* pointer to individual signature algorithm */
|
||||
const uint16_t *sig_alg; /* iterate through configured signature schemes */
|
||||
unsigned int signature_scheme; /* store received signature algorithm scheme */
|
||||
uint32_t common_idx = 0; /* iterate through received_signature_schemes_list */
|
||||
size_t buf_len = end - buf;
|
||||
|
||||
MBEDTLS_SSL_CHK_BUF_READ_PTR( buf, end, 2 );
|
||||
|
||||
sig_alg_list_size = MBEDTLS_GET_UINT16_BE( buf, 0 );
|
||||
if( sig_alg_list_size + 2 != buf_len ||
|
||||
sig_alg_list_size % 2 != 0 )
|
||||
{
|
||||
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad signature_algorithms extension" ) );
|
||||
return( MBEDTLS_ERR_SSL_DECODE_ERROR );
|
||||
}
|
||||
memset( ssl->handshake->recv_sig_schemes_list, 0,
|
||||
sizeof( ssl->handshake->recv_sig_schemes_list ) );
|
||||
|
||||
for( p = buf + 2; p < end && common_idx + 1 < MBEDTLS_PK_SIGNATURE_MAX_SIZE; p += 2 )
|
||||
{
|
||||
signature_scheme = MBEDTLS_GET_UINT16_BE( p, 0 );
|
||||
|
||||
MBEDTLS_SSL_DEBUG_MSG( 4, ( "received signature algorithm: 0x%x",
|
||||
signature_scheme ) );
|
||||
|
||||
for( sig_alg = ssl->conf->tls13_sig_algs;
|
||||
*sig_alg != MBEDTLS_TLS1_3_SIG_NONE; sig_alg++ )
|
||||
{
|
||||
if( *sig_alg == signature_scheme )
|
||||
{
|
||||
ssl->handshake->recv_sig_schemes_list[common_idx] = signature_scheme;
|
||||
common_idx++;
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if( common_idx == 0 )
|
||||
{
|
||||
MBEDTLS_SSL_DEBUG_MSG( 3, ( "no signature algorithm in common" ) );
|
||||
MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE,
|
||||
MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE );
|
||||
return( MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE );
|
||||
}
|
||||
|
||||
ssl->handshake->recv_sig_schemes_list[common_idx] = MBEDTLS_TLS1_3_SIG_NONE;
|
||||
|
||||
return( 0 );
|
||||
}
|
||||
#endif
|
||||
|
||||
/*
|
||||
*
|
||||
* STATE HANDLING: CertificateRequest
|
||||
*
|
||||
*/
|
||||
|
||||
/*
|
||||
* Overview
|
||||
*/
|
||||
|
||||
/* Coordination:
|
||||
* Deals with the ambiguity of not knowing if a CertificateRequest
|
||||
* will be sent. Returns a negative code on failure, or
|
||||
* - SSL_CERTIFICATE_REQUEST_EXPECT_REQUEST
|
||||
* - SSL_CERTIFICATE_REQUEST_SKIP
|
||||
* indicating if a Certificate Request is expected or not.
|
||||
*/
|
||||
#define SSL_CERTIFICATE_REQUEST_EXPECT_REQUEST 0
|
||||
#define SSL_CERTIFICATE_REQUEST_SKIP 1
|
||||
|
||||
/*
|
||||
* Implementation
|
||||
*/
|
||||
|
||||
static int ssl_tls13_certificate_request_coordinate( mbedtls_ssl_context *ssl )
|
||||
{
|
||||
int ret;
|
||||
|
||||
if( mbedtls_ssl_tls13_psk_enabled( ssl ) )
|
||||
{
|
||||
MBEDTLS_SSL_DEBUG_MSG( 3, ( "<= skip parse certificate request" ) );
|
||||
return( SSL_CERTIFICATE_REQUEST_SKIP );
|
||||
}
|
||||
|
||||
if( ( ret = mbedtls_ssl_read_record( ssl, 0 ) ) != 0 )
|
||||
{
|
||||
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
|
||||
return( ret );
|
||||
}
|
||||
ssl->keep_current_message = 1;
|
||||
|
||||
if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE )
|
||||
{
|
||||
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate request message" ) );
|
||||
MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE,
|
||||
MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
|
||||
return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
|
||||
}
|
||||
|
||||
return( SSL_CERTIFICATE_REQUEST_SKIP );
|
||||
}
|
||||
|
||||
#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED)
|
||||
static int ssl_tls13_parse_certificate_request( mbedtls_ssl_context *ssl,
|
||||
const unsigned char *buf,
|
||||
const unsigned char *end )
|
||||
{
|
||||
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
||||
const unsigned char *p = buf;
|
||||
const unsigned char *ext = NULL;
|
||||
size_t ext_len = 0;
|
||||
size_t context_len = 0;
|
||||
|
||||
|
||||
/*
|
||||
* struct {
|
||||
* opaque certificate_request_context<0..2^8-1>;
|
||||
* Extension extensions<2..2^16-1>;
|
||||
* } CertificateRequest;
|
||||
*/
|
||||
|
||||
/*
|
||||
* Parse certificate_request_context
|
||||
*/
|
||||
|
||||
MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, 1 );
|
||||
context_len = (size_t) p[0];
|
||||
/* skip context_len */
|
||||
p++;
|
||||
|
||||
/* Fixed length fields are:
|
||||
* - 1 for length of context
|
||||
* - 2 for length of extensions
|
||||
* -----
|
||||
* 3 bytes
|
||||
*/
|
||||
MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, 3 );
|
||||
|
||||
/* store context ( if necessary ) */
|
||||
if( context_len > 0 )
|
||||
{
|
||||
MBEDTLS_SSL_DEBUG_BUF( 3, "Certificate Request Context",
|
||||
p, context_len );
|
||||
|
||||
ssl->handshake->cert_req_ctx = mbedtls_calloc( context_len, 1 );
|
||||
if( ssl->handshake->cert_req_ctx == NULL )
|
||||
{
|
||||
MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
|
||||
return ( MBEDTLS_ERR_SSL_ALLOC_FAILED );
|
||||
}
|
||||
memcpy( ssl->handshake->cert_req_ctx, p, context_len );
|
||||
|
||||
/* jump over certificate_request_context */
|
||||
p += context_len;
|
||||
}
|
||||
|
||||
/*
|
||||
* Parse extensions
|
||||
*/
|
||||
ext_len = MBEDTLS_GET_UINT16_BE( p, 0 );
|
||||
|
||||
/* At least one extension needs to be present,
|
||||
* namely signature_algorithms ext. */
|
||||
if( ext_len < 4 )
|
||||
{
|
||||
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate request message" ) );
|
||||
MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR,
|
||||
MBEDTLS_ERR_SSL_DECODE_ERROR );
|
||||
return( MBEDTLS_ERR_SSL_DECODE_ERROR );
|
||||
}
|
||||
|
||||
/* skip total extension length */
|
||||
p += 2;
|
||||
|
||||
ext = p; /* jump to extensions */
|
||||
while( ext_len )
|
||||
{
|
||||
size_t ext_id = MBEDTLS_GET_UINT16_BE( ext, 0 );
|
||||
size_t ext_size = MBEDTLS_GET_UINT16_BE( ext, 1 );
|
||||
|
||||
if( ext_size + 4 > ext_len )
|
||||
{
|
||||
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate request message" ) );
|
||||
MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR,
|
||||
MBEDTLS_ERR_SSL_DECODE_ERROR );
|
||||
return( MBEDTLS_ERR_SSL_DECODE_ERROR );
|
||||
}
|
||||
|
||||
switch( ext_id )
|
||||
{
|
||||
case MBEDTLS_TLS_EXT_SIG_ALG:
|
||||
MBEDTLS_SSL_DEBUG_MSG( 3,
|
||||
( "found signature_algorithms extension" ) );
|
||||
|
||||
if( ( ret = ssl_tls13_parse_signature_algorithms_ext( ssl,
|
||||
ext + 4, ext + 4 + ext_size ) ) != 0 )
|
||||
{
|
||||
MBEDTLS_SSL_DEBUG_RET( 1,
|
||||
"ssl_tls13_parse_signature_algorithms_ext", ret );
|
||||
MBEDTLS_SSL_PEND_FATAL_ALERT(
|
||||
MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR, ret );
|
||||
return( ret );
|
||||
}
|
||||
break;
|
||||
|
||||
default:
|
||||
MBEDTLS_SSL_DEBUG_MSG( 3,
|
||||
( "unknown extension found: %" MBEDTLS_PRINTF_SIZET " ( ignoring )",
|
||||
ext_id ) );
|
||||
break;
|
||||
}
|
||||
|
||||
ext_len -= 4 + ext_size;
|
||||
ext += 4 + ext_size;
|
||||
|
||||
if( ( ext_len > 0 ) && ( ext_len < 4 ) )
|
||||
{
|
||||
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate request message" ) );
|
||||
MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR,
|
||||
MBEDTLS_ERR_SSL_DECODE_ERROR );
|
||||
return( MBEDTLS_ERR_SSL_DECODE_ERROR );
|
||||
}
|
||||
}
|
||||
|
||||
ssl->client_auth = 1;
|
||||
return( 0 );
|
||||
}
|
||||
#endif /* ( MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED ) */
|
||||
|
||||
/* Main entry point; orchestrates the other functions */
|
||||
int mbedtls_ssl_tls13_process_certificate_request( mbedtls_ssl_context *ssl )
|
||||
{
|
||||
int ret = 0;
|
||||
|
||||
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse certificate request" ) );
|
||||
|
||||
/* Coordination step
|
||||
* - Fetch record
|
||||
* - Make sure it's either a CertificateRequest or a ServerHelloDone
|
||||
*/
|
||||
MBEDTLS_SSL_PROC_CHK_NEG( ssl_tls13_certificate_request_coordinate( ssl ) );
|
||||
|
||||
#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED)
|
||||
if( ret == SSL_CERTIFICATE_REQUEST_EXPECT_REQUEST )
|
||||
{
|
||||
unsigned char *buf;
|
||||
size_t buf_len;
|
||||
|
||||
MBEDTLS_SSL_PROC_CHK( mbedtls_ssl_tls13_fetch_handshake_msg( ssl,
|
||||
MBEDTLS_SSL_HS_CERTIFICATE_REQUEST,
|
||||
&buf, &buf_len ) );
|
||||
|
||||
MBEDTLS_SSL_PROC_CHK( ssl_tls13_parse_certificate_request( ssl,
|
||||
buf, buf + buf_len ) );
|
||||
|
||||
mbedtls_ssl_tls13_add_hs_msg_to_checksum(
|
||||
ssl, MBEDTLS_SSL_HS_CERTIFICATE_REQUEST, buf, buf_len );
|
||||
}
|
||||
else
|
||||
#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED */
|
||||
if( ret == SSL_CERTIFICATE_REQUEST_SKIP )
|
||||
{
|
||||
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate request" ) );
|
||||
}
|
||||
else
|
||||
{
|
||||
MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
|
||||
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
||||
}
|
||||
|
||||
MBEDTLS_SSL_DEBUG_MSG( 3, ( "got %s certificate request",
|
||||
ssl->client_auth ? "a" : "no" ) );
|
||||
|
||||
cleanup:
|
||||
|
||||
/* In the MPS one would close the read-port here to
|
||||
* ensure there's no overlap of reading and writing. */
|
||||
|
||||
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse certificate request" ) );
|
||||
return( ret );
|
||||
}
|
||||
|
||||
/*
|
||||
* STATE HANDLING: Read CertificateVerify
|
||||
*/
|
||||
@ -487,20 +860,20 @@ static int ssl_tls13_parse_certificate( mbedtls_ssl_context *ssl,
|
||||
const unsigned char *end )
|
||||
{
|
||||
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
||||
size_t certificate_request_context_len = 0;
|
||||
size_t cert_req_ctx_len = 0;
|
||||
size_t certificate_list_len = 0;
|
||||
const unsigned char *p = buf;
|
||||
const unsigned char *certificate_list_end;
|
||||
|
||||
MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, 4 );
|
||||
certificate_request_context_len = p[0];
|
||||
cert_req_ctx_len = p[0];
|
||||
certificate_list_len = MBEDTLS_GET_UINT24_BE( p, 1 );
|
||||
p += 4;
|
||||
|
||||
/* In theory, the certificate list can be up to 2^24 Bytes, but we don't
|
||||
* support anything beyond 2^16 = 64K.
|
||||
*/
|
||||
if( ( certificate_request_context_len != 0 ) ||
|
||||
if( ( cert_req_ctx_len != 0 ) ||
|
||||
( certificate_list_len >= 0x10000 ) )
|
||||
{
|
||||
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) );
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user