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Merge pull request #5916 from yuhaoth/pr/tls13-refactor-get-sig-alg-from-pk

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Refactor signature algorithm chooser
This commit is contained in:
Ronald Cron 2022-07-04 09:10:08 +02:00 • committed by GitHub
commit 0e39ece23f
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GPG key ID: 4AEE18F83AFDEB23
9 changed files with 624 additions and 309 deletions
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281
library/ssl_misc.h
View file

@ -1925,8 +1925,12 @@ static inline const void *mbedtls_ssl_get_sig_algs(
#if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
#if !defined(MBEDTLS_DEPRECATED_REMOVED)
if( ssl->handshake != NULL && ssl->handshake->sig_algs != NULL )
if( ssl->handshake != NULL &&
ssl->handshake->sig_algs_heap_allocated == 1 &&
ssl->handshake->sig_algs != NULL )
{
return( ssl->handshake->sig_algs );
}
#endif
return( ssl->conf->sig_algs );
@ -1972,97 +1976,177 @@ static inline int mbedtls_ssl_sig_alg_is_offered( const mbedtls_ssl_context *ssl
return( 0 );
}
#if defined(MBEDTLS_SSL_PROTO_TLS1_3)
static inline int mbedtls_ssl_tls13_get_pk_type_and_md_alg_from_sig_alg(
uint16_t sig_alg, mbedtls_pk_type_t *pk_type, mbedtls_md_type_t *md_alg )
{
*pk_type = MBEDTLS_PK_NONE;
*md_alg = MBEDTLS_MD_NONE;
*pk_type = mbedtls_ssl_pk_alg_from_sig( sig_alg & 0xff );
*md_alg = mbedtls_ssl_md_alg_from_hash( ( sig_alg >> 8 ) & 0xff );
if( *pk_type != MBEDTLS_PK_NONE && *md_alg != MBEDTLS_MD_NONE )
return( 0 );
switch( sig_alg )
{
#if defined(MBEDTLS_ECDSA_C)
#if defined(MBEDTLS_SHA256_C) && defined(MBEDTLS_ECP_DP_SECP256R1_ENABLED)
case MBEDTLS_TLS1_3_SIG_ECDSA_SECP256R1_SHA256:
*md_alg = MBEDTLS_MD_SHA256;
*pk_type = MBEDTLS_PK_ECDSA;
break;
#endif /* MBEDTLS_SHA256_C && MBEDTLS_ECP_DP_SECP256R1_ENABLED */
#if defined(MBEDTLS_SHA384_C) && defined(MBEDTLS_ECP_DP_SECP384R1_ENABLED)
case MBEDTLS_TLS1_3_SIG_ECDSA_SECP384R1_SHA384:
*md_alg = MBEDTLS_MD_SHA384;
*pk_type = MBEDTLS_PK_ECDSA;
break;
#endif /* MBEDTLS_SHA384_C && MBEDTLS_ECP_DP_SECP384R1_ENABLED */
#if defined(MBEDTLS_SHA512_C) && defined(MBEDTLS_ECP_DP_SECP521R1_ENABLED)
case MBEDTLS_TLS1_3_SIG_ECDSA_SECP521R1_SHA512:
*md_alg = MBEDTLS_MD_SHA512;
*pk_type = MBEDTLS_PK_ECDSA;
break;
#endif /* MBEDTLS_SHA512_C && MBEDTLS_ECP_DP_SECP521R1_ENABLED */
#endif /* MBEDTLS_ECDSA_C */
#if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT)
#if defined(MBEDTLS_PKCS1_V21)
#if defined(MBEDTLS_SHA256_C)
case MBEDTLS_TLS1_3_SIG_RSA_PSS_RSAE_SHA256:
*md_alg = MBEDTLS_MD_SHA256;
*pk_type = MBEDTLS_PK_RSASSA_PSS;
break;
#endif /* MBEDTLS_SHA256_C */
#if defined(MBEDTLS_SHA384_C)
case MBEDTLS_TLS1_3_SIG_RSA_PSS_RSAE_SHA384:
*md_alg = MBEDTLS_MD_SHA384;
*pk_type = MBEDTLS_PK_RSASSA_PSS;
break;
#endif /* MBEDTLS_SHA384_C */
#if defined(MBEDTLS_SHA512_C)
case MBEDTLS_TLS1_3_SIG_RSA_PSS_RSAE_SHA512:
*md_alg = MBEDTLS_MD_SHA512;
*pk_type = MBEDTLS_PK_RSASSA_PSS;
break;
#endif /* MBEDTLS_SHA512_C */
#endif /* MBEDTLS_X509_RSASSA_PSS_SUPPORT */
#if defined(MBEDTLS_PKCS1_V15) && defined(MBEDTLS_RSA_C)
#if defined(MBEDTLS_SHA256_C)
case MBEDTLS_TLS1_3_SIG_RSA_PKCS1_SHA256:
*md_alg = MBEDTLS_MD_SHA256;
*pk_type = MBEDTLS_PK_RSA;
break;
#endif /* MBEDTLS_SHA256_C */
#if defined(MBEDTLS_SHA384_C)
case MBEDTLS_TLS1_3_SIG_RSA_PKCS1_SHA384:
*md_alg = MBEDTLS_MD_SHA384;
*pk_type = MBEDTLS_PK_RSA;
break;
#endif /* MBEDTLS_SHA384_C */
#if defined(MBEDTLS_SHA512_C)
case MBEDTLS_TLS1_3_SIG_RSA_PKCS1_SHA512:
*md_alg = MBEDTLS_MD_SHA512;
*pk_type = MBEDTLS_PK_RSA;
break;
#endif /* MBEDTLS_SHA512_C */
#endif /* MBEDTLS_PKCS1_V15 && MBEDTLS_RSA_C */
#endif /* MBEDTLS_PKCS1_V21 */
default:
return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
}
return( 0 );
}
#if defined(MBEDTLS_SSL_PROTO_TLS1_3)
static inline int mbedtls_ssl_tls13_sig_alg_for_cert_verify_is_supported(
const uint16_t sig_alg )
{
switch( sig_alg )
{
#if defined(MBEDTLS_ECDSA_C)
#if defined(MBEDTLS_SHA256_C) && defined(MBEDTLS_ECP_DP_SECP256R1_ENABLED)
case MBEDTLS_TLS1_3_SIG_ECDSA_SECP256R1_SHA256:
break;
#endif /* MBEDTLS_SHA256_C && MBEDTLS_ECP_DP_SECP256R1_ENABLED */
#if defined(MBEDTLS_SHA384_C) && defined(MBEDTLS_ECP_DP_SECP384R1_ENABLED)
case MBEDTLS_TLS1_3_SIG_ECDSA_SECP384R1_SHA384:
break;
#endif /* MBEDTLS_SHA384_C && MBEDTLS_ECP_DP_SECP384R1_ENABLED */
#if defined(MBEDTLS_SHA512_C) && defined(MBEDTLS_ECP_DP_SECP521R1_ENABLED)
case MBEDTLS_TLS1_3_SIG_ECDSA_SECP521R1_SHA512:
break;
#endif /* MBEDTLS_SHA512_C && MBEDTLS_ECP_DP_SECP521R1_ENABLED */
#endif /* MBEDTLS_ECDSA_C */
#if defined(MBEDTLS_PKCS1_V21)
#if defined(MBEDTLS_SHA256_C)
case MBEDTLS_TLS1_3_SIG_RSA_PSS_RSAE_SHA256:
break;
#endif /* MBEDTLS_SHA256_C */
#if defined(MBEDTLS_SHA384_C)
case MBEDTLS_TLS1_3_SIG_RSA_PSS_RSAE_SHA384:
break;
#endif /* MBEDTLS_SHA384_C */
#if defined(MBEDTLS_SHA512_C)
case MBEDTLS_TLS1_3_SIG_RSA_PSS_RSAE_SHA512:
break;
#endif /* MBEDTLS_SHA512_C */
#endif /* MBEDTLS_PKCS1_V21 */
default:
return( 0 );
}
return( 1 );
}
static inline int mbedtls_ssl_tls13_sig_alg_is_supported(
const uint16_t sig_alg )
{
switch( sig_alg )
{
#if defined(MBEDTLS_PKCS1_V15)
#if defined(MBEDTLS_SHA256_C)
case MBEDTLS_TLS1_3_SIG_RSA_PKCS1_SHA256:
break;
#endif /* MBEDTLS_SHA256_C */
#if defined(MBEDTLS_SHA384_C)
case MBEDTLS_TLS1_3_SIG_RSA_PKCS1_SHA384:
break;
#endif /* MBEDTLS_SHA384_C */
#if defined(MBEDTLS_SHA512_C)
case MBEDTLS_TLS1_3_SIG_RSA_PKCS1_SHA512:
break;
#endif /* MBEDTLS_SHA512_C */
#endif /* MBEDTLS_PKCS1_V15 */
default:
return( mbedtls_ssl_tls13_sig_alg_for_cert_verify_is_supported(
sig_alg ) );
}
return( 1 );
}
#endif /* MBEDTLS_SSL_PROTO_TLS1_3 */
#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
static inline int mbedtls_ssl_tls12_sig_alg_is_supported(
const uint16_t sig_alg )
{
/* High byte is hash */
unsigned char hash = MBEDTLS_BYTE_1( sig_alg );
unsigned char sig = MBEDTLS_BYTE_0( sig_alg );
switch( hash )
{
#if defined(MBEDTLS_MD5_C)
case MBEDTLS_SSL_HASH_MD5:
break;
#endif
#if defined(MBEDTLS_SHA1_C)
case MBEDTLS_SSL_HASH_SHA1:
break;
#endif
#if defined(MBEDTLS_SHA224_C)
case MBEDTLS_SSL_HASH_SHA224:
break;
#endif
#if defined(MBEDTLS_SHA256_C)
case MBEDTLS_SSL_HASH_SHA256:
break;
#endif
#if defined(MBEDTLS_SHA384_C)
case MBEDTLS_SSL_HASH_SHA384:
break;
#endif
#if defined(MBEDTLS_SHA512_C)
case MBEDTLS_SSL_HASH_SHA512:
break;
#endif
default:
return( 0 );
}
switch( sig )
{
#if defined(MBEDTLS_RSA_C)
case MBEDTLS_SSL_SIG_RSA:
break;
#endif
#if defined(MBEDTLS_ECDSA_C)
case MBEDTLS_SSL_SIG_ECDSA:
break;
#endif
default:
return( 0 );
}
return( 1 );
}
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
static inline int mbedtls_ssl_sig_alg_is_supported(
const mbedtls_ssl_context *ssl,
const uint16_t sig_alg )
@ -2071,79 +2155,28 @@ static inline int mbedtls_ssl_sig_alg_is_supported(
#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
if( ssl->tls_version == MBEDTLS_SSL_VERSION_TLS1_2 )
{
/* High byte is hash */
unsigned char hash = MBEDTLS_BYTE_1( sig_alg );
unsigned char sig = MBEDTLS_BYTE_0( sig_alg );
switch( hash )
{
#if defined(MBEDTLS_MD5_C)
case MBEDTLS_SSL_HASH_MD5:
break;
#endif
#if defined(MBEDTLS_SHA1_C)
case MBEDTLS_SSL_HASH_SHA1:
break;
#endif
#if defined(MBEDTLS_SHA224_C)
case MBEDTLS_SSL_HASH_SHA224:
break;
#endif
#if defined(MBEDTLS_SHA256_C)
case MBEDTLS_SSL_HASH_SHA256:
break;
#endif
#if defined(MBEDTLS_SHA384_C)
case MBEDTLS_SSL_HASH_SHA384:
break;
#endif
#if defined(MBEDTLS_SHA512_C)
case MBEDTLS_SSL_HASH_SHA512:
break;
#endif
default:
return( 0 );
}
switch( sig )
{
#if defined(MBEDTLS_RSA_C)
case MBEDTLS_SSL_SIG_RSA:
break;
#endif
#if defined(MBEDTLS_ECDSA_C)
case MBEDTLS_SSL_SIG_ECDSA:
break;
#endif
default:
return( 0 );
}
return( 1 );
return( mbedtls_ssl_tls12_sig_alg_is_supported( sig_alg ) );
}
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
#if defined(MBEDTLS_SSL_PROTO_TLS1_3)
if( ssl->tls_version == MBEDTLS_SSL_VERSION_TLS1_3 )
{
mbedtls_pk_type_t pk_type;
mbedtls_md_type_t md_alg;
return( ! mbedtls_ssl_tls13_get_pk_type_and_md_alg_from_sig_alg(
sig_alg, &pk_type, &md_alg ) );
return( mbedtls_ssl_tls13_sig_alg_is_supported( sig_alg ) );
}
#endif /* MBEDTLS_SSL_PROTO_TLS1_3 */
((void) ssl);
((void) sig_alg);
return( 0 );
}
#if defined(MBEDTLS_SSL_PROTO_TLS1_3)
int mbedtls_ssl_tls13_check_sig_alg_cert_key_match( uint16_t sig_alg,
mbedtls_pk_context *key );
#endif /* MBEDTLS_SSL_PROTO_TLS1_3 */
#endif /* MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */
#if defined(MBEDTLS_USE_PSA_CRYPTO) || defined(MBEDTLS_SSL_PROTO_TLS1_3)
@ -2279,10 +2312,6 @@ int mbedtls_ssl_parse_server_name_ext( mbedtls_ssl_context *ssl,
const unsigned char *end );
#endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */
int mbedtls_ssl_tls13_get_sig_alg_from_pk( mbedtls_ssl_context *ssl,
mbedtls_pk_context *own_key,
uint16_t *algorithm );
#if defined(MBEDTLS_SSL_ALPN)
int mbedtls_ssl_parse_alpn_ext( mbedtls_ssl_context *ssl,
const unsigned char *buf,

91
library/ssl_tls.c
View file

@ -853,10 +853,9 @@ static int ssl_handshake_init( mbedtls_ssl_context *ssl )
else
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
{
ssl->handshake->sig_algs = ssl->conf->sig_algs;
ssl->handshake->sig_algs_heap_allocated = 0;
}
#endif /* MBEDTLS_DEPRECATED_REMOVED */
#endif /* !MBEDTLS_DEPRECATED_REMOVED */
#endif /* MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */
return( 0 );
}
@ -4027,28 +4026,6 @@ void mbedtls_ssl_config_init( mbedtls_ssl_config *conf )
memset( conf, 0, sizeof( mbedtls_ssl_config ) );
}
#if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
#if !defined(MBEDTLS_DEPRECATED_REMOVED)
/* The selection should be the same as mbedtls_x509_crt_profile_default in
* x509_crt.c. Here, the order matters. Currently we favor stronger hashes,
* for no fundamental reason.
* See the documentation of mbedtls_ssl_conf_curves() for what we promise
* about this list. */
static int ssl_preset_default_hashes[] = {
#if defined(MBEDTLS_SHA512_C)
MBEDTLS_MD_SHA512,
#endif
#if defined(MBEDTLS_SHA384_C)
MBEDTLS_MD_SHA384,
#endif
#if defined(MBEDTLS_SHA256_C)
MBEDTLS_MD_SHA256,
#endif
MBEDTLS_MD_NONE
};
#endif /* !MBEDTLS_DEPRECATED_REMOVED */
#endif /* MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */
/* The selection should be the same as mbedtls_x509_crt_profile_default in
* x509_crt.c, plus Montgomery curves for ECDHE. Here, the order matters:
* curves with a lower resource usage come first.
@ -4090,17 +4067,6 @@ static int ssl_preset_suiteb_ciphersuites[] = {
};
#if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
#if !defined(MBEDTLS_DEPRECATED_REMOVED)
static int ssl_preset_suiteb_hashes[] = {
#if defined(MBEDTLS_SHA256_C)
MBEDTLS_MD_SHA256,
#endif
#if defined(MBEDTLS_SHA384_C)
MBEDTLS_MD_SHA384,
#endif
MBEDTLS_MD_NONE
};
#endif /* !MBEDTLS_DEPRECATED_REMOVED */
/* NOTICE:
* For ssl_preset_*_sig_algs and ssl_tls12_preset_*_sig_algs, the following
@ -4109,6 +4075,13 @@ static int ssl_preset_suiteb_hashes[] = {
* - But if there is a good reason, do not change the order of the algorithms.
* - ssl_tls12_present* is for TLS 1.2 use only.
* - ssl_preset_* is for TLS 1.3 only or hybrid TLS 1.3/1.2 handshakes.
*
* When GnuTLS/Openssl server is configured in TLS 1.2 mode with a certificate
* declaring an RSA public key and Mbed TLS is configured in hybrid mode, if
* `rsa_pss_rsae_*` algorithms are before `rsa_pkcs1_*` ones in this list then
* the GnuTLS/Openssl server chooses an `rsa_pss_rsae_*` signature algorithm
* for its signature in the key exchange message. As Mbed TLS 1.2 does not
* support them, the handshake fails.
*/
static uint16_t ssl_preset_default_sig_algs[] = {
@ -4130,10 +4103,6 @@ static uint16_t ssl_preset_default_sig_algs[] = {
#endif /* MBEDTLS_ECDSA_C && MBEDTLS_SHA384_C &&
MBEDTLS_ECP_DP_SECP521R1_ENABLED */
#if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT) && defined(MBEDTLS_SHA256_C)
MBEDTLS_TLS1_3_SIG_RSA_PSS_RSAE_SHA256,
#endif /* MBEDTLS_X509_RSASSA_PSS_SUPPORT && MBEDTLS_SHA256_C */
#if defined(MBEDTLS_RSA_C) && defined(MBEDTLS_SHA512_C)
MBEDTLS_TLS1_3_SIG_RSA_PKCS1_SHA512,
#endif /* MBEDTLS_RSA_C && MBEDTLS_SHA512_C */
@ -4146,6 +4115,18 @@ static uint16_t ssl_preset_default_sig_algs[] = {
MBEDTLS_TLS1_3_SIG_RSA_PKCS1_SHA256,
#endif /* MBEDTLS_RSA_C && MBEDTLS_SHA256_C */
#if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT) && defined(MBEDTLS_SHA512_C)
MBEDTLS_TLS1_3_SIG_RSA_PSS_RSAE_SHA512,
#endif /* MBEDTLS_X509_RSASSA_PSS_SUPPORT && MBEDTLS_SHA512_C */
#if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT) && defined(MBEDTLS_SHA384_C)
MBEDTLS_TLS1_3_SIG_RSA_PSS_RSAE_SHA384,
#endif /* MBEDTLS_X509_RSASSA_PSS_SUPPORT && MBEDTLS_SHA384_C */
#if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT) && defined(MBEDTLS_SHA256_C)
MBEDTLS_TLS1_3_SIG_RSA_PSS_RSAE_SHA256,
#endif /* MBEDTLS_X509_RSASSA_PSS_SUPPORT && MBEDTLS_SHA256_C */
MBEDTLS_TLS_SIG_NONE
};
@ -4429,9 +4410,6 @@ int mbedtls_ssl_config_defaults( mbedtls_ssl_config *conf,
#endif
#if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
#if !defined(MBEDTLS_DEPRECATED_REMOVED)
conf->sig_hashes = ssl_preset_suiteb_hashes;
#endif /* !MBEDTLS_DEPRECATED_REMOVED */
#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
if( mbedtls_ssl_conf_is_tls12_only( conf ) )
conf->sig_algs = ssl_tls12_preset_suiteb_sig_algs;
@ -4458,9 +4436,6 @@ int mbedtls_ssl_config_defaults( mbedtls_ssl_config *conf,
#endif
#if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
#if !defined(MBEDTLS_DEPRECATED_REMOVED)
conf->sig_hashes = ssl_preset_default_hashes;
#endif /* !MBEDTLS_DEPRECATED_REMOVED */
#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
if( mbedtls_ssl_conf_is_tls12_only( conf ) )
conf->sig_algs = ssl_tls12_preset_default_sig_algs;
@ -4945,13 +4920,20 @@ int mbedtls_ssl_parse_sig_alg_ext( mbedtls_ssl_context *ssl,
MBEDTLS_SSL_CHK_BUF_READ_PTR( p, supported_sig_algs_end, 2 );
sig_alg = MBEDTLS_GET_UINT16_BE( p, 0 );
p += 2;
MBEDTLS_SSL_DEBUG_MSG( 4, ( "received signature algorithm: 0x%x",
sig_alg ) );
if( ! mbedtls_ssl_sig_alg_is_supported( ssl, sig_alg ) ||
! mbedtls_ssl_sig_alg_is_offered( ssl, sig_alg ) )
MBEDTLS_SSL_DEBUG_MSG( 4, ( "received signature algorithm: 0x%x %s",
sig_alg,
mbedtls_ssl_sig_alg_to_str( sig_alg ) ) );
#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
if( ssl->tls_version == MBEDTLS_SSL_VERSION_TLS1_2 &&
( ! ( mbedtls_ssl_sig_alg_is_supported( ssl, sig_alg ) &&
mbedtls_ssl_sig_alg_is_offered( ssl, sig_alg ) ) ) )
{
continue;
}
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
MBEDTLS_SSL_DEBUG_MSG( 4, ( "valid signature algorithm: %s",
mbedtls_ssl_sig_alg_to_str( sig_alg ) ) );
if( common_idx + 1 < MBEDTLS_RECEIVED_SIG_ALGS_SIZE )
{
@ -8189,12 +8171,17 @@ int mbedtls_ssl_write_sig_alg_ext( mbedtls_ssl_context *ssl, unsigned char *buf,
for( ; *sig_alg != MBEDTLS_TLS1_3_SIG_NONE; sig_alg++ )
{
MBEDTLS_SSL_DEBUG_MSG( 3, ( "got signature scheme [%x] %s",
*sig_alg,
mbedtls_ssl_sig_alg_to_str( *sig_alg ) ) );
if( ! mbedtls_ssl_sig_alg_is_supported( ssl, *sig_alg ) )
continue;
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 ) );
MBEDTLS_SSL_DEBUG_MSG( 3, ( "sent signature scheme [%x] %s",
*sig_alg,
mbedtls_ssl_sig_alg_to_str( *sig_alg ) ) );
}
/* Length of supported_signature_algorithms */

162
library/ssl_tls13_generic.c
View file

@ -850,120 +850,84 @@ cleanup:
/*
* STATE HANDLING: Output Certificate Verify
*/
int mbedtls_ssl_tls13_get_sig_alg_from_pk( mbedtls_ssl_context *ssl,
mbedtls_pk_context *own_key,
uint16_t *algorithm )
{
mbedtls_pk_type_t sig = mbedtls_ssl_sig_from_pk( own_key );
/* Determine the size of the key */
size_t own_key_size = mbedtls_pk_get_bitlen( own_key );
*algorithm = MBEDTLS_TLS1_3_SIG_NONE;
((void) own_key_size);
switch( sig )
int mbedtls_ssl_tls13_check_sig_alg_cert_key_match( uint16_t sig_alg,
mbedtls_pk_context *key )
{
mbedtls_pk_type_t pk_type = mbedtls_ssl_sig_from_pk( key );
size_t key_size = mbedtls_pk_get_bitlen( key );
switch( pk_type )
{
#if defined(MBEDTLS_ECDSA_C)
case MBEDTLS_SSL_SIG_ECDSA:
switch( own_key_size )
switch( key_size )
{
case 256:
*algorithm = MBEDTLS_TLS1_3_SIG_ECDSA_SECP256R1_SHA256;
return( 0 );
return(
sig_alg == MBEDTLS_TLS1_3_SIG_ECDSA_SECP256R1_SHA256 );
case 384:
*algorithm = MBEDTLS_TLS1_3_SIG_ECDSA_SECP384R1_SHA384;
return( 0 );
return(
sig_alg == MBEDTLS_TLS1_3_SIG_ECDSA_SECP384R1_SHA384 );
case 521:
*algorithm = MBEDTLS_TLS1_3_SIG_ECDSA_SECP521R1_SHA512;
return( 0 );
return(
sig_alg == MBEDTLS_TLS1_3_SIG_ECDSA_SECP521R1_SHA512 );
default:
MBEDTLS_SSL_DEBUG_MSG( 3,
( "unknown key size: %"
MBEDTLS_PRINTF_SIZET " bits",
own_key_size ) );
break;
}
break;
#endif /* MBEDTLS_ECDSA_C */
#if defined(MBEDTLS_RSA_C)
case MBEDTLS_SSL_SIG_RSA:
#if defined(MBEDTLS_PKCS1_V21)
#if defined(MBEDTLS_SHA256_C)
if( own_key_size <= 2048 &&
mbedtls_ssl_sig_alg_is_received( ssl,
MBEDTLS_TLS1_3_SIG_RSA_PSS_RSAE_SHA256 ) )
switch( sig_alg )
{
*algorithm = MBEDTLS_TLS1_3_SIG_RSA_PSS_RSAE_SHA256;
return( 0 );
}
else
#endif /* MBEDTLS_SHA256_C */
#if defined(MBEDTLS_SHA384_C)
if( own_key_size <= 3072 &&
mbedtls_ssl_sig_alg_is_received( ssl,
MBEDTLS_TLS1_3_SIG_RSA_PSS_RSAE_SHA384 ) )
{
*algorithm = MBEDTLS_TLS1_3_SIG_RSA_PSS_RSAE_SHA384;
return( 0 );
}
else
#endif /* MBEDTLS_SHA384_C */
#if defined(MBEDTLS_SHA512_C)
if( own_key_size <= 4096 &&
mbedtls_ssl_sig_alg_is_received( ssl,
MBEDTLS_TLS1_3_SIG_RSA_PSS_RSAE_SHA512 ) )
{
*algorithm = MBEDTLS_TLS1_3_SIG_RSA_PSS_RSAE_SHA512;
return( 0 );
}
else
#endif /* MBEDTLS_SHA512_C */
#endif /* MBEDTLS_PKCS1_V21 */
#if defined(MBEDTLS_PKCS1_V15)
#if defined(MBEDTLS_SHA256_C)
if( own_key_size <= 2048 &&
mbedtls_ssl_sig_alg_is_received( ssl,
MBEDTLS_TLS1_3_SIG_RSA_PKCS1_SHA256 ) )
{
*algorithm = MBEDTLS_TLS1_3_SIG_RSA_PKCS1_SHA256;
return( 0 );
}
else
#endif /* MBEDTLS_SHA256_C */
#if defined(MBEDTLS_SHA384_C)
if( own_key_size <= 3072 &&
mbedtls_ssl_sig_alg_is_received( ssl,
MBEDTLS_TLS1_3_SIG_RSA_PKCS1_SHA384 ) )
{
*algorithm = MBEDTLS_TLS1_3_SIG_RSA_PKCS1_SHA384;
return( 0 );
}
else
#endif /* MBEDTLS_SHA384_C */
#if defined(MBEDTLS_SHA512_C)
if( own_key_size <= 4096 &&
mbedtls_ssl_sig_alg_is_received( ssl,
MBEDTLS_TLS1_3_SIG_RSA_PKCS1_SHA512 ) )
{
*algorithm = MBEDTLS_TLS1_3_SIG_RSA_PKCS1_SHA512;
return( 0 );
}
else
#endif /* MBEDTLS_SHA512_C */
#endif /* MBEDTLS_PKCS1_V15 */
{
MBEDTLS_SSL_DEBUG_MSG( 3,
( "unknown key size: %"
MBEDTLS_PRINTF_SIZET " bits",
own_key_size ) );
case MBEDTLS_TLS1_3_SIG_RSA_PSS_RSAE_SHA256:
return( key_size <= 3072 );
case MBEDTLS_TLS1_3_SIG_RSA_PSS_RSAE_SHA384:
return( key_size <= 7680 );
case MBEDTLS_TLS1_3_SIG_RSA_PSS_RSAE_SHA512:
return( 1 );
default:
break;
}
break;
#endif /* MBEDTLS_RSA_C */
default:
MBEDTLS_SSL_DEBUG_MSG( 1,
( "unknown signature type : %u", sig ) );
break;
}
return( 0 );
}
static int ssl_tls13_select_sig_alg_for_certificate_verify(
mbedtls_ssl_context *ssl,
mbedtls_pk_context *own_key,
uint16_t *algorithm )
{
uint16_t *sig_alg = ssl->handshake->received_sig_algs;
*algorithm = MBEDTLS_TLS1_3_SIG_NONE;
for( ; *sig_alg != MBEDTLS_TLS1_3_SIG_NONE ; sig_alg++ )
{
if( mbedtls_ssl_sig_alg_is_offered( ssl, *sig_alg ) &&
mbedtls_ssl_tls13_sig_alg_for_cert_verify_is_supported( *sig_alg ) &&
mbedtls_ssl_tls13_check_sig_alg_cert_key_match( *sig_alg, own_key ) )
{
MBEDTLS_SSL_DEBUG_MSG( 3,
( "select_sig_alg_for_certificate_verify:"
"selected signature algorithm %s [%04x]",
mbedtls_ssl_sig_alg_to_str( *sig_alg ),
*sig_alg ) );
*algorithm = *sig_alg;
return( 0 );
}
}
MBEDTLS_SSL_DEBUG_MSG( 2,
( "select_sig_alg_for_certificate_verify:"
"no suitable signature algorithm found" ) );
return( -1 );
}
@ -1020,8 +984,9 @@ static int ssl_tls13_write_certificate_verify_body( mbedtls_ssl_context *ssl,
* opaque signature<0..2^16-1>;
* } CertificateVerify;
*/
ret = mbedtls_ssl_tls13_get_sig_alg_from_pk( ssl, own_key, &algorithm );
if( ret != 0 || ! mbedtls_ssl_sig_alg_is_received( ssl, algorithm ) )
ret = ssl_tls13_select_sig_alg_for_certificate_verify( ssl, own_key,
&algorithm );
if( ret != 0 )
{
MBEDTLS_SSL_DEBUG_MSG( 1,
( "signature algorithm not in received or offered list." ) );
@ -1034,6 +999,9 @@ static int ssl_tls13_write_certificate_verify_body( mbedtls_ssl_context *ssl,
return( MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE );
}
MBEDTLS_SSL_DEBUG_MSG( 2, ( "CertificateVerify with %s",
mbedtls_ssl_sig_alg_to_str( algorithm )) );
if( mbedtls_ssl_tls13_get_pk_type_and_md_alg_from_sig_alg(
algorithm, &pk_type, &md_alg ) != 0 )
{

22
library/ssl_tls13_server.c
View file

@ -352,7 +352,6 @@ static int ssl_tls13_pick_key_cert( mbedtls_ssl_context *ssl )
{
mbedtls_ssl_key_cert *key_cert, *key_cert_list;
const uint16_t *sig_alg = ssl->handshake->received_sig_algs;
uint16_t key_sig_alg;
#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
if( ssl->handshake->sni_key_cert != NULL )
@ -372,7 +371,6 @@ static int ssl_tls13_pick_key_cert( mbedtls_ssl_context *ssl )
for( key_cert = key_cert_list; key_cert != NULL;
key_cert = key_cert->next )
{
int ret;
MBEDTLS_SSL_DEBUG_CRT( 3, "certificate (chain) candidate",
key_cert->cert );
@ -391,13 +389,21 @@ static int ssl_tls13_pick_key_cert( mbedtls_ssl_context *ssl )
continue;
}
ret = mbedtls_ssl_tls13_get_sig_alg_from_pk(
ssl, &key_cert->cert->pk, &key_sig_alg );
if( ret != 0 )
continue;
if( *sig_alg == key_sig_alg )
MBEDTLS_SSL_DEBUG_MSG( 3,
( "ssl_tls13_pick_key_cert:"
"check signature algorithm %s [%04x]",
mbedtls_ssl_sig_alg_to_str( *sig_alg ),
*sig_alg ) );
if( mbedtls_ssl_tls13_check_sig_alg_cert_key_match(
*sig_alg, &key_cert->cert->pk ) )
{
ssl->handshake->key_cert = key_cert;
MBEDTLS_SSL_DEBUG_MSG( 3,
( "ssl_tls13_pick_key_cert:"
"selected signature algorithm"
" %s [%04x]",
mbedtls_ssl_sig_alg_to_str( *sig_alg ),
*sig_alg ) );
MBEDTLS_SSL_DEBUG_CRT(
3, "selected certificate (chain)",
ssl->handshake->key_cert->cert );
@ -406,6 +412,8 @@ static int ssl_tls13_pick_key_cert( mbedtls_ssl_context *ssl )
}
}
MBEDTLS_SSL_DEBUG_MSG( 2, ( "ssl_tls13_pick_key_cert:"
"no suitable certificate found" ) );
return( -1 );
}
#endif /* MBEDTLS_X509_CRT_PARSE_C &&