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Use PSA-based ciphers for record protections in TLS-1.2 only

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Reasons:
- For the first release, we attempt to support TLS-1.2 only,
- At least TLS-1.0 is known to not work at the moment, as
  for CBC ciphersuites the code in mbedtls_ssl_decrypt_buf()
  and mbedtls_ssl_encrypt_buf() assumes that mbedtls_cipher_crypt()
  updates the structure field for the IV in the cipher context,
  which the PSA-based implementation currently doesn't.
This commit is contained in:
Hanno Becker 2018-11-17 22:27:38 +00:00
parent 329919eadf
commit fc20c14e76
1 changed files with 64 additions and 21 deletions
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49
library/ssl_tls.c
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@ -610,6 +610,9 @@ static void ssl_calc_finished_tls_sha384( mbedtls_ssl_context *, unsigned char *
int mbedtls_ssl_derive_keys( mbedtls_ssl_context *ssl ) int mbedtls_ssl_derive_keys( mbedtls_ssl_context *ssl )
{ {
int ret = 0; int ret = 0;
#if defined(MBEDTLS_USE_PSA_CRYPTO)
int psa_fallthrough;
#endif /* MBEDTLS_USE_PSA_CRYPTO */
unsigned char tmp[64]; unsigned char tmp[64];
unsigned char keyblk[256]; unsigned char keyblk[256];
unsigned char *key1; unsigned char *key1;
@ -1032,6 +1035,15 @@ int mbedtls_ssl_derive_keys( mbedtls_ssl_context *ssl )
#endif #endif
#if defined(MBEDTLS_USE_PSA_CRYPTO) #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, ret = mbedtls_cipher_setup_psa( &transform->cipher_ctx_enc,
cipher_info, taglen ); cipher_info, taglen );
if( ret != 0 && ret != MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE ) if( ret != 0 && ret != MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE )
@ -1041,11 +1053,23 @@ int mbedtls_ssl_derive_keys( mbedtls_ssl_context *ssl )
} }
if( ret == 0 ) if( ret == 0 )
{
MBEDTLS_SSL_DEBUG_MSG( 1, ( "Successfully setup PSA-based encryption cipher context" ) ); MBEDTLS_SSL_DEBUG_MSG( 1, ( "Successfully setup PSA-based encryption cipher context" ) );
psa_fallthrough = 0;
}
else else
{
MBEDTLS_SSL_DEBUG_MSG( 1, ( "Failed to setup PSA-based cipher context for record encryption - fall through to default setup." ) ); 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( ret != 0 ) if( psa_fallthrough == 1 )
#endif /* MBEDTLS_USE_PSA_CRYPTO */ #endif /* MBEDTLS_USE_PSA_CRYPTO */
if( ( ret = mbedtls_cipher_setup( &transform->cipher_ctx_enc, if( ( ret = mbedtls_cipher_setup( &transform->cipher_ctx_enc,
cipher_info ) ) != 0 ) cipher_info ) ) != 0 )
@ -1055,9 +1079,16 @@ int mbedtls_ssl_derive_keys( mbedtls_ssl_context *ssl )
} }
#if defined(MBEDTLS_USE_PSA_CRYPTO) #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, ret = mbedtls_cipher_setup_psa( &transform->cipher_ctx_dec,
cipher_info, taglen ); cipher_info, taglen );
if( ret != 0 && ret != MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE ) if( ret != 0 && ret != MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE )
{ {
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setup_psa", ret ); MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setup_psa", ret );
@ -1065,11 +1096,23 @@ int mbedtls_ssl_derive_keys( mbedtls_ssl_context *ssl )
} }
if( ret == 0 ) if( ret == 0 )
{
MBEDTLS_SSL_DEBUG_MSG( 1, ( "Successfully setup PSA-based decryption cipher context" ) ); MBEDTLS_SSL_DEBUG_MSG( 1, ( "Successfully setup PSA-based decryption cipher context" ) );
psa_fallthrough = 0;
}
else else
{
MBEDTLS_SSL_DEBUG_MSG( 1, ( "Failed to setup PSA-based cipher context for record decryption - fall through to default setup." ) ); 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( ret != 0 ) if( psa_fallthrough == 1 )
#endif /* MBEDTLS_USE_PSA_CRYPTO */ #endif /* MBEDTLS_USE_PSA_CRYPTO */
if( ( ret = mbedtls_cipher_setup( &transform->cipher_ctx_dec, if( ( ret = mbedtls_cipher_setup( &transform->cipher_ctx_dec,
cipher_info ) ) != 0 ) cipher_info ) ) != 0 )