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TLS 1.3: Take into account key policy while picking a signature algorithm

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Signed-off-by: Przemek Stekiel <przemyslaw.stekiel@mobica.com>
This commit is contained in:
Przemek Stekiel 2022-07-04 16:16:15 +02:00 committed by Ronald Cron
parent 409a620dea
commit b40f2e81ec
1 changed files with 34 additions and 1 deletions
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35
library/ssl_tls13_generic.c
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@ -934,13 +934,46 @@ static int ssl_tls13_select_sig_alg_for_certificate_verify(
uint16_t *algorithm )
{
uint16_t *sig_alg = ssl->handshake->received_sig_algs;
psa_algorithm_t psa_alg = 0;
*algorithm = MBEDTLS_TLS1_3_SIG_NONE;
for( ; *sig_alg != MBEDTLS_TLS1_3_SIG_NONE ; sig_alg++ )
{
switch( *sig_alg )
{
case MBEDTLS_TLS1_3_SIG_ECDSA_SECP256R1_SHA256:
psa_alg = PSA_ALG_ECDSA( PSA_ALG_SHA_256 );
break;
case MBEDTLS_TLS1_3_SIG_ECDSA_SECP384R1_SHA384:
psa_alg = PSA_ALG_ECDSA( PSA_ALG_SHA_384 );
break;
case MBEDTLS_TLS1_3_SIG_ECDSA_SECP521R1_SHA512:
psa_alg = PSA_ALG_ECDSA( PSA_ALG_SHA_512 );
break;
case MBEDTLS_TLS1_3_SIG_RSA_PSS_RSAE_SHA256:
psa_alg = PSA_ALG_RSA_PSS( PSA_ALG_SHA_256 );
break;
case MBEDTLS_TLS1_3_SIG_RSA_PSS_RSAE_SHA384:
psa_alg = PSA_ALG_RSA_PSS( PSA_ALG_SHA_384 );
break;
case MBEDTLS_TLS1_3_SIG_RSA_PSS_RSAE_SHA512:
psa_alg = PSA_ALG_RSA_PSS( PSA_ALG_SHA_512 );
break;
case MBEDTLS_TLS1_3_SIG_RSA_PKCS1_SHA256:
case MBEDTLS_TLS1_3_SIG_RSA_PKCS1_SHA384:
case MBEDTLS_TLS1_3_SIG_RSA_PKCS1_SHA512:
psa_alg = PSA_ALG_RSA_PKCS1V15_CRYPT;
break;
default:
break;
}
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_tls13_check_sig_alg_cert_key_match( *sig_alg, own_key ) &&
psa_alg != 0 &&
mbedtls_pk_can_do_ext( own_key, psa_alg,
PSA_KEY_USAGE_SIGN_HASH ) == 1 )
{
MBEDTLS_SSL_DEBUG_MSG( 3,
( "select_sig_alg_for_certificate_verify:"