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Merge pull request #5253 from AndrzejKurek/chacha-iv-len-16-fixes

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Return an error from `mbedtls_cipher_set_iv` for an invalid IV length with ChaCha20 and ChaCha20+Poly
This commit is contained in:
Gilles Peskine 2022-01-21 21:46:08 +01:00 committed by GitHub
commit fe271b9c92
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GPG Key ID: 4AEE18F83AFDEB23
5 changed files with 115 additions and 3 deletions
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4
ChangeLog.d/chacha20_invalid_iv_len_fix.txt Normal file
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@ -0,0 +1,4 @@
Default behavior changes
* mbedtls_cipher_set_iv will now fail with ChaCha20 and ChaCha20+Poly1305
for IV lengths other than 12. The library was silently overwriting this
length with 12, but did not inform the caller about it. Fixes #4301.

11
library/cipher.c
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@ -386,6 +386,12 @@ int mbedtls_cipher_set_iv( mbedtls_cipher_context_t *ctx,
#if defined(MBEDTLS_CHACHA20_C)
if ( ctx->cipher_info->type == MBEDTLS_CIPHER_CHACHA20 )
{
/* Even though the actual_iv_size is overwritten with a correct value
* of 12 from the cipher info, return an error to indicate that
* the input iv_len is wrong. */
if( iv_len != 12 )
return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
if ( 0 != mbedtls_chacha20_starts( (mbedtls_chacha20_context*)ctx->cipher_ctx,
iv,
0U ) ) /* Initial counter value */
@ -393,6 +399,11 @@ int mbedtls_cipher_set_iv( mbedtls_cipher_context_t *ctx,
return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
}
}
#if defined(MBEDTLS_CHACHAPOLY_C)
if ( ctx->cipher_info->type == MBEDTLS_CIPHER_CHACHA20_POLY1305 &&
iv_len != 12 )
return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
#endif
#endif
#if defined(MBEDTLS_GCM_C)

24
tests/suites/test_suite_cipher.chacha20.data
View File

@ -1,3 +1,7 @@
Decrypt empty buffer
depends_on:MBEDTLS_CHACHA20_C
dec_empty_buf:MBEDTLS_CIPHER_CHACHA20:0:0
Chacha20 RFC 7539 Test Vector #1
depends_on:MBEDTLS_CHACHA20_C
decrypt_test_vec:MBEDTLS_CIPHER_CHACHA20:-1:"0000000000000000000000000000000000000000000000000000000000000000":"000000000000000000000000":"76b8e0ada0f13d90405d6ae55386bd28bdd219b8a08ded1aa836efcc8b770dc7da41597c5157488d7724e03fb8d84a376a43b8f41518a11cc387b669b2ee6586":"00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000":"":"":0:0
@ -109,3 +113,23 @@ enc_dec_buf_multipart:MBEDTLS_CIPHER_CHACHA20:256:6:16:-1:6:16:6:16
ChaCha20 Encrypt and decrypt 32 bytes in multiple parts
depends_on:MBEDTLS_CHACHA20_C
enc_dec_buf_multipart:MBEDTLS_CIPHER_CHACHA20:256:16:16:-1:16:16:16:16
ChaCha20 IV Length 0
depends_on:MBEDTLS_CHACHA20_C
check_iv:MBEDTLS_CIPHER_CHACHA20:"CHACHA20":0:MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA
ChaCha20 IV Length 11
depends_on:MBEDTLS_CHACHA20_C
check_iv:MBEDTLS_CIPHER_CHACHA20:"CHACHA20":11:MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA
ChaCha20 IV Length 12
depends_on:MBEDTLS_CHACHA20_C
check_iv:MBEDTLS_CIPHER_CHACHA20:"CHACHA20":12:0
ChaCha20 IV Length 13
depends_on:MBEDTLS_CHACHA20_C
check_iv:MBEDTLS_CIPHER_CHACHA20:"CHACHA20":13:MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA
ChaCha20 IV Length 16
depends_on:MBEDTLS_CHACHA20_C
check_iv:MBEDTLS_CIPHER_CHACHA20:"CHACHA20":16:MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA

20
tests/suites/test_suite_cipher.chachapoly.data
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@ -121,3 +121,23 @@ auth_crypt_tv:MBEDTLS_CIPHER_CHACHA20_POLY1305:"1c9240a5eb55d38af333888604f6b5f0
Chacha20+Poly1305 RFC 7539 Test Vector #1 (streaming)
depends_on:MBEDTLS_CHACHAPOLY_C
decrypt_test_vec:MBEDTLS_CIPHER_CHACHA20_POLY1305:-1:"1c9240a5eb55d38af333888604f6b5f0473917c1402b80099dca5cbc207075c0":"000000000102030405060708":"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":"496e7465726e65742d4472616674732061726520647261667420646f63756d656e74732076616c696420666f722061206d6178696d756d206f6620736978206d6f6e74687320616e64206d617920626520757064617465642c207265706c616365642c206f72206f62736f6c65746564206279206f7468657220646f63756d656e747320617420616e792074696d652e20497420697320696e617070726f70726961746520746f2075736520496e7465726e65742d447261667473206173207265666572656e6365206d6174657269616c206f7220746f2063697465207468656d206f74686572207468616e206173202fe2809c776f726b20696e2070726f67726573732e2fe2809d":"f33388860000000000004e91":"eead9d67890cbb22392336fea1851f38":0:0
ChaCha20+Poly1305 IV Length 0
depends_on:MBEDTLS_CHACHAPOLY_C
check_iv:MBEDTLS_CIPHER_CHACHA20_POLY1305:"CHACHA20-POLY1305":0:MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA
ChaCha20+Poly1305 IV Length 11
depends_on:MBEDTLS_CHACHAPOLY_C
check_iv:MBEDTLS_CIPHER_CHACHA20_POLY1305:"CHACHA20-POLY1305":11:MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA
ChaCha20+Poly1305 IV Length 12
depends_on:MBEDTLS_CHACHAPOLY_C
check_iv:MBEDTLS_CIPHER_CHACHA20_POLY1305:"CHACHA20-POLY1305":12:0
ChaCha20+Poly1305 IV Length 13
depends_on:MBEDTLS_CHACHAPOLY_C
check_iv:MBEDTLS_CIPHER_CHACHA20_POLY1305:"CHACHA20-POLY1305":13:MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA
ChaCha20+Poly1305 IV Length 16
depends_on:MBEDTLS_CHACHAPOLY_C
check_iv:MBEDTLS_CIPHER_CHACHA20_POLY1305:"CHACHA20-POLY1305":16:MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA

59
tests/suites/test_suite_cipher.function
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@ -442,6 +442,9 @@ void enc_dec_buf( int cipher_id, char * cipher_string, int key_len,
if( NULL != strstr( cipher_info->name, "CCM*-NO-TAG") )
iv_len = 13; /* For CCM, IV length is expected to be between 7 and 13 bytes.
* For CCM*-NO-TAG, IV length must be exactly 13 bytes long. */
else if( cipher_info->type == MBEDTLS_CIPHER_CHACHA20 ||
cipher_info->type == MBEDTLS_CIPHER_CHACHA20_POLY1305 )
iv_len = 12;
else
iv_len = sizeof(iv);
@ -568,7 +571,9 @@ void dec_empty_buf( int cipher,
int expected_finish_ret )
{
unsigned char key[32];
unsigned char iv[16];
unsigned char *iv = NULL;
size_t iv_len = 16;
mbedtls_cipher_context_t ctx_dec;
const mbedtls_cipher_info_t *cipher_info;
@ -579,7 +584,6 @@ void dec_empty_buf( int cipher,
size_t outlen = 0;
memset( key, 0, 32 );
memset( iv , 0, 16 );
mbedtls_cipher_init( &ctx_dec );
@ -589,6 +593,14 @@ void dec_empty_buf( int cipher,
/* Initialise context */
cipher_info = mbedtls_cipher_info_from_type( cipher );
TEST_ASSERT( NULL != cipher_info);
if( cipher_info->type == MBEDTLS_CIPHER_CHACHA20 ||
cipher_info->type == MBEDTLS_CIPHER_CHACHA20_POLY1305 )
iv_len = 12;
ASSERT_ALLOC( iv, iv_len );
memset( iv , 0, iv_len );
TEST_ASSERT( sizeof(key) * 8 >= cipher_info->key_bitlen );
TEST_ASSERT( 0 == mbedtls_cipher_setup( &ctx_dec, cipher_info ) );
@ -597,7 +609,7 @@ void dec_empty_buf( int cipher,
key, cipher_info->key_bitlen,
MBEDTLS_DECRYPT ) );
TEST_ASSERT( 0 == mbedtls_cipher_set_iv( &ctx_dec, iv, 16 ) );
TEST_ASSERT( 0 == mbedtls_cipher_set_iv( &ctx_dec, iv, iv_len ) );
TEST_ASSERT( 0 == mbedtls_cipher_reset( &ctx_dec ) );
@ -627,6 +639,7 @@ void dec_empty_buf( int cipher,
TEST_ASSERT( 0 == outlen );
exit:
mbedtls_free( iv );
mbedtls_cipher_free( &ctx_dec );
}
/* END_CASE */
@ -689,6 +702,9 @@ void enc_dec_buf_multipart( int cipher_id, int key_len, int first_length_val,
if( NULL != strstr( cipher_info->name, "CCM*-NO-TAG") )
iv_len = 13; /* For CCM, IV length is expected to be between 7 and 13 bytes.
* For CCM*-NO-TAG, IV length must be exactly 13 bytes long. */
else if( cipher_info->type == MBEDTLS_CIPHER_CHACHA20 ||
cipher_info->type == MBEDTLS_CIPHER_CHACHA20_POLY1305 )
iv_len = 12;
else
iv_len = sizeof(iv);
@ -1130,3 +1146,40 @@ void check_padding( int pad_mode, data_t * input, int ret, int dlen_check
TEST_ASSERT( dlen == (size_t) dlen_check );
}
/* END_CASE */
/* BEGIN_CASE */
void check_iv( int cipher_id, char * cipher_string,
int iv_len_val, int ret )
{
size_t iv_len = iv_len_val;
unsigned char iv[16];
const mbedtls_cipher_info_t *cipher_info;
mbedtls_cipher_context_t ctx_dec;
mbedtls_cipher_context_t ctx_enc;
/*
* Prepare contexts
*/
mbedtls_cipher_init( &ctx_dec );
mbedtls_cipher_init( &ctx_enc );
/* Check and get info structures */
cipher_info = mbedtls_cipher_info_from_type( cipher_id );
TEST_ASSERT( NULL != cipher_info );
TEST_ASSERT( mbedtls_cipher_info_from_string( cipher_string ) == cipher_info );
TEST_ASSERT( strcmp( mbedtls_cipher_info_get_name( cipher_info ),
cipher_string ) == 0 );
/* Initialise enc and dec contexts */
TEST_ASSERT( 0 == mbedtls_cipher_setup( &ctx_dec, cipher_info ) );
TEST_ASSERT( 0 == mbedtls_cipher_setup( &ctx_enc, cipher_info ) );
TEST_ASSERT( ret == mbedtls_cipher_set_iv( &ctx_dec, iv, iv_len ) );
TEST_ASSERT( ret == mbedtls_cipher_set_iv( &ctx_enc, iv, iv_len ) );
exit:
mbedtls_cipher_free( &ctx_dec );
mbedtls_cipher_free( &ctx_enc );
}
/* END_CASE */