mirror of
https://github.com/yuzu-emu/mbedtls.git
synced 2025-11-04 14:05:08 +00:00
Add FI countermeasures to the ssl module
This commit adds mainly buffer pointer and length duplication and checks, but also some hamming distance and return values checking improvements. Signed-off-by: Andrzej Kurek <andrzej.kurek@arm.com>
This commit is contained in:
Andrzej Kurek
parent
74f7d0f03d
commit
84bde419e1
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@ -3587,7 +3587,10 @@ static int ssl_out_client_key_exchange_write( mbedtls_ssl_context *ssl,
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{
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int ret;
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unsigned char *p, *end;
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volatile unsigned char *buf_dup = buf;
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volatile size_t buflen_dup = buflen;
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size_t n;
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mbedtls_ssl_ciphersuite_handle_t ciphersuite_info =
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mbedtls_ssl_handshake_get_ciphersuite( ssl->handshake );
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@ -3870,7 +3873,12 @@ static int ssl_out_client_key_exchange_write( mbedtls_ssl_context *ssl,
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}
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*olen = p - buf;
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return( 0 );
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/* Secure against buffer substitution */
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if( buf_dup == buf && buflen_dup == buflen )
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{
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return( 0 );
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}
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return( MBEDTLS_ERR_PLATFORM_FAULT_DETECTED );
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}
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static int ssl_out_client_key_exchange_postprocess( mbedtls_ssl_context *ssl )
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@ -3269,13 +3269,19 @@ static int ssl_resume_server_key_exchange( mbedtls_ssl_context *ssl,
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- sig_start );
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int ret = ssl->conf->f_async_resume( ssl,
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sig_start, signature_len, sig_max_len );
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volatile size_t *signature_len_dup = signature_len;
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if( ret != MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS )
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{
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ssl->handshake->async_in_progress = 0;
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mbedtls_ssl_set_async_operation_data( ssl, NULL );
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}
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MBEDTLS_SSL_DEBUG_RET( 2, "ssl_resume_server_key_exchange", ret );
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return( ret );
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/* Secure against buffer substitution */
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if( signature_len_dup == signature_len )
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{
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return( ret );
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}
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return( MBEDTLS_ERR_PLATFORM_FAULT_DETECTED );
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}
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#endif /* defined(MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED) &&
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defined(MBEDTLS_SSL_ASYNC_PRIVATE) */
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@ -3678,7 +3684,7 @@ static int ssl_prepare_server_key_exchange( mbedtls_ssl_context *ssl,
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{
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return( 0 );
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}
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return MBEDTLS_ERR_PLATFORM_FAULT_DETECTED;
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return( MBEDTLS_ERR_PLATFORM_FAULT_DETECTED );
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}
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/* Prepare the ServerKeyExchange message and send it. For ciphersuites
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@ -3826,6 +3832,8 @@ static int ssl_parse_client_dh_public( mbedtls_ssl_context *ssl, unsigned char *
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const unsigned char *end )
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{
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int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
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unsigned char ** volatile p_dup = p;
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volatile const unsigned char *end_dup = end;
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size_t n;
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/*
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@ -3856,7 +3864,12 @@ static int ssl_parse_client_dh_public( mbedtls_ssl_context *ssl, unsigned char *
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MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: GY", &ssl->handshake->dhm_ctx.GY );
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return( ret );
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/* Secure against buffer substitution */
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if( p_dup == p && end_dup == end )
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{
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return( ret );
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}
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return( MBEDTLS_ERR_PLATFORM_FAULT_DETECTED );
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}
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#endif /* MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED ||
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MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED */
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@ -4423,7 +4436,7 @@ static int ssl_in_client_key_exchange_parse( mbedtls_ssl_context *ssl,
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{
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return( ret );
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}
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return MBEDTLS_ERR_PLATFORM_FAULT_DETECTED;
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return( MBEDTLS_ERR_PLATFORM_FAULT_DETECTED );
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}
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/* Update the handshake state */
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@ -232,7 +232,7 @@ exit:
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if( buf_dup != buf || buflen_dup != buflen )
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{
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return MBEDTLS_ERR_PLATFORM_FAULT_DETECTED;
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return( MBEDTLS_ERR_PLATFORM_FAULT_DETECTED );
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}
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MBEDTLS_SSL_DEBUG_MSG( 1, ( "<= mbedtls_ssl_check_record" ) );
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return( ret );
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@ -288,6 +288,9 @@ int mbedtls_ssl_set_cid( mbedtls_ssl_context *ssl,
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unsigned char const *own_cid,
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size_t own_cid_len )
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{
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volatile unsigned char const *own_cid_dup = own_cid;
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volatile size_t own_cid_len_dup = own_cid_len;
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if( MBEDTLS_SSL_TRANSPORT_IS_TLS( ssl->conf->transport ) )
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return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
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@ -314,7 +317,12 @@ int mbedtls_ssl_set_cid( mbedtls_ssl_context *ssl,
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* MBEDTLS_SSL_CID_IN_LEN_MAX at most 255. */
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ssl->own_cid_len = (uint8_t) own_cid_len;
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return( 0 );
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/* Secure against buffer substitution */
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if( own_cid_dup == own_cid && own_cid_len_dup == own_cid_len )
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{
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return( 0 );
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}
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return( MBEDTLS_ERR_PLATFORM_FAULT_DETECTED );
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}
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int mbedtls_ssl_get_peer_cid( mbedtls_ssl_context *ssl,
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@ -611,7 +619,13 @@ MBEDTLS_NO_INLINE static int ssl3_prf( const unsigned char *secret, size_t slen,
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mbedtls_sha1_context sha1;
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unsigned char padding[16];
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unsigned char sha1sum[20];
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((void)label);
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volatile const unsigned char *secret_dup = secret;
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volatile size_t slen_dup = slen;
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volatile const char *label_dup = label;
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volatile const unsigned char *random_dup = random;
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volatile size_t rlen_dup = rlen;
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volatile unsigned char *dstbuf_dup = dstbuf;
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volatile size_t dlen_dup = dlen;
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mbedtls_md5_init( &md5 );
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mbedtls_sha1_init( &sha1 );
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@ -656,7 +670,14 @@ exit:
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mbedtls_platform_zeroize( padding, sizeof( padding ) );
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mbedtls_platform_zeroize( sha1sum, sizeof( sha1sum ) );
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return( ret );
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/* Secure against buffer substitution */
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if( secret_dup == secret && slen_dup == slen && label_dup == label &&
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random_dup == random && rlen_dup == rlen && dstbuf_dup == dstbuf &&
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dlen_dup == dlen )
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{
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return( ret );
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}
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return( MBEDTLS_ERR_PLATFORM_FAULT_DETECTED );
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}
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#endif /* MBEDTLS_SSL_PROTO_SSL3 */
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@ -674,6 +695,13 @@ MBEDTLS_NO_INLINE static int tls1_prf( const unsigned char *secret, size_t slen,
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mbedtls_md_handle_t md_info;
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mbedtls_md_context_t md_ctx;
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int ret;
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volatile const unsigned char *secret_dup = secret;
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volatile size_t slen_dup = slen;
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volatile const char *label_dup = label;
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volatile const unsigned char *random_dup = random;
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volatile size_t rlen_dup = rlen;
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volatile unsigned char *dstbuf_dup = dstbuf;
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volatile size_t dlen_dup = dlen;
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mbedtls_md_init( &md_ctx );
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@ -760,7 +788,14 @@ MBEDTLS_NO_INLINE static int tls1_prf( const unsigned char *secret, size_t slen,
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mbedtls_platform_zeroize( tmp, sizeof( tmp ) );
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mbedtls_platform_zeroize( h_i, sizeof( h_i ) );
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return( 0 );
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/* Secure against buffer substitution */
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if( secret_dup == secret && slen_dup == slen && label_dup == label &&
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random_dup == random && rlen_dup == rlen && dstbuf_dup == dstbuf &&
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dlen_dup == dlen )
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{
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return( 0 );
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}
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return( MBEDTLS_ERR_PLATFORM_FAULT_DETECTED );
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}
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#endif /* MBEDTLS_SSL_PROTO_TLS1) || MBEDTLS_SSL_PROTO_TLS1_1 */
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@ -783,6 +818,13 @@ int tls_prf_generic( mbedtls_md_type_t md_type,
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mbedtls_md_handle_t md_info;
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mbedtls_md_context_t md_ctx;
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int ret;
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volatile const unsigned char *secret_dup = secret;
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volatile size_t slen_dup = slen;
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volatile const char *label_dup = label;
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volatile const unsigned char *random_dup = random;
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volatile size_t rlen_dup = rlen;
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volatile unsigned char *dstbuf_dup = dstbuf;
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volatile size_t dlen_dup = dlen;
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mbedtls_md_init( &md_ctx );
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@ -842,7 +884,14 @@ int tls_prf_generic( mbedtls_md_type_t md_type,
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(void)mbedtls_platform_zeroize( tmp, sizeof( tmp ) );
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(void)mbedtls_platform_zeroize( h_i, sizeof( h_i ) );
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return( 0 );
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/* Secure against buffer substitution */
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if( secret_dup == secret && slen_dup == slen && label_dup == label &&
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random_dup == random && rlen_dup == rlen && dstbuf_dup == dstbuf &&
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dlen_dup == dlen )
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{
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return( 0 );
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}
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return( MBEDTLS_ERR_PLATFORM_FAULT_DETECTED );
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}
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#if defined(MBEDTLS_SHA256_C)
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@ -1834,6 +1883,7 @@ static int ssl_compute_master( mbedtls_ssl_handshake_params *handshake,
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const mbedtls_ssl_context *ssl )
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{
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int ret;
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volatile unsigned char *master_dup = master;
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/* #if !defined(MBEDTLS_DEBUG_C) && !defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET) */
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/* ssl = NULL; /\* make sure we don't use it except for debug and EMS *\/ */
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@ -1894,8 +1944,12 @@ static int ssl_compute_master( mbedtls_ssl_handshake_params *handshake,
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mbedtls_platform_zeroize( handshake->premaster,
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sizeof(handshake->premaster) );
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return( 0 );
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/* Secure against buffer substitution */
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if( master_dup == master )
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{
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return( 0 );
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}
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return( MBEDTLS_ERR_PLATFORM_FAULT_DETECTED );
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}
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int mbedtls_ssl_derive_keys( mbedtls_ssl_context *ssl )
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@ -2412,22 +2466,33 @@ static int ssl_cid_build_inner_plaintext( unsigned char *content,
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size_t pad = ( MBEDTLS_SSL_CID_PADDING_GRANULARITY -
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( len + 1 ) % MBEDTLS_SSL_CID_PADDING_GRANULARITY ) %
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MBEDTLS_SSL_CID_PADDING_GRANULARITY;
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volatile unsigned char *content_dup = content;
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volatile size_t *content_size_dup = content_size;
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volatile size_t remaining_dup = remaining;
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/* Write real content type */
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if( remaining == 0 )
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return( -1 );
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return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
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content[ len ] = rec_type;
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len++;
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remaining--;
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if( remaining < pad )
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return( -1 );
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return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
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mbedtls_platform_memset( content + len, 0, pad );
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len += pad;
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remaining -= pad;
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*content_size = len;
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return( 0 );
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/* Secure against buffer substitution */
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if( content_dup == content && content_size_dup == content_size &&
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( remaining_dup - 1 - pad ) == remaining )
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{
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return( 0 );
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}
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return( MBEDTLS_ERR_PLATFORM_FAULT_DETECTED );
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}
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/* This function parses a DTLSInnerPlaintext structure.
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@ -2572,6 +2637,7 @@ int mbedtls_ssl_encrypt_buf( mbedtls_ssl_context *ssl,
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if( rec->cid_len != 0 )
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{
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int ret = MBEDTLS_ERR_PLATFORM_FAULT_DETECTED;
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/*
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* Wrap plaintext into DTLSInnerPlaintext structure.
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* See ssl_cid_build_inner_plaintext() for more information.
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@ -2579,12 +2645,12 @@ int mbedtls_ssl_encrypt_buf( mbedtls_ssl_context *ssl,
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* Note that this changes `rec->data_len`, and hence
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* `post_avail` needs to be recalculated afterwards.
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*/
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if( ssl_cid_build_inner_plaintext( data,
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&rec->data_len,
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post_avail,
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rec->type ) != 0 )
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if( ( ret = ssl_cid_build_inner_plaintext( data,
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&rec->data_len,
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post_avail,
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rec->type ) ) != 0 )
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{
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return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
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return( ret );
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}
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rec->type = MBEDTLS_SSL_MSG_CID;
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@ -4831,13 +4897,13 @@ static int ssl_bitmask_check( unsigned char *mask, size_t len )
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for( i = 0; i < len / 8; i++ )
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if( mask[i] != 0xFF )
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return( -1 );
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return( 0x75555555 );
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for( i = 0; i < len % 8; i++ )
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if( ( mask[len / 8] & ( 1 << ( 7 - i ) ) ) == 0 )
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return( -1 );
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return( 0x75555555 );
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return( 0 );
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return( 0 );
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}
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/* msg_len does not include the handshake header */
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@ -7070,10 +7136,10 @@ static int ssl_check_peer_crt_unchanged( mbedtls_ssl_context *ssl,
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mbedtls_x509_crt const * const peer_crt = ssl->session->peer_cert;
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if( peer_crt == NULL )
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return( -1 );
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return( 0x75555555 );
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if( peer_crt->raw.len != crt_buf_len )
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return( -1 );
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return( 0x75555555 );
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return( mbedtls_platform_memcmp( peer_crt->raw.p, crt_buf, crt_buf_len ) );
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}
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@ -7095,16 +7161,16 @@ static int ssl_check_peer_crt_unchanged( mbedtls_ssl_context *ssl,
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if( peer_cert_digest == NULL ||
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digest_info == MBEDTLS_MD_INVALID_HANDLE )
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{
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return( -1 );
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return( 0x75555555 );
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}
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digest_len = mbedtls_md_get_size( digest_info );
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if( digest_len > MBEDTLS_SSL_PEER_CERT_DIGEST_MAX_LEN )
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return( -1 );
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return( 0x75555555 );
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ret = mbedtls_md( digest_info, crt_buf, crt_buf_len, tmp_digest );
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if( ret != 0 )
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return( -1 );
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return( 0x75555555 );
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return( mbedtls_platform_memcmp( tmp_digest, peer_cert_digest, digest_len ) );
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}
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@ -10869,6 +10935,8 @@ int mbedtls_ssl_read( mbedtls_ssl_context *ssl, unsigned char *buf, size_t len )
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{
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int ret;
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size_t n;
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volatile unsigned char *buf_dup = buf;
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volatile size_t len_dup = len;
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if( ssl == NULL || ssl->conf == NULL )
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return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
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@ -11182,7 +11250,12 @@ int mbedtls_ssl_read( mbedtls_ssl_context *ssl, unsigned char *buf, size_t len )
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MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= read" ) );
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return( (int) n );
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/* Secure against buffer substitution */
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if( buf_dup == buf && len_dup == len )
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{
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return( (int) n );
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}
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return( MBEDTLS_ERR_PLATFORM_FAULT_DETECTED );
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}
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/*
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@ -11202,6 +11275,8 @@ static int ssl_write_real( mbedtls_ssl_context *ssl,
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{
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int ret = mbedtls_ssl_get_max_out_record_payload( ssl );
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const size_t max_len = (size_t) ret;
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volatile const unsigned char *buf_dup = buf;
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volatile size_t len_dup = len;
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if( ret < 0 )
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{
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@ -11224,6 +11299,7 @@ static int ssl_write_real( mbedtls_ssl_context *ssl,
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#if defined(MBEDTLS_SSL_PROTO_TLS)
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{
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len = max_len;
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len_dup = len;
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}
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#endif
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}
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@ -11259,8 +11335,12 @@ static int ssl_write_real( mbedtls_ssl_context *ssl,
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return( ret );
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}
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}
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return( (int) len );
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/* Secure against buffer substitution */
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if( buf_dup == buf && len_dup == len )
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{
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return( (int) len );
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}
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return( MBEDTLS_ERR_PLATFORM_FAULT_DETECTED );
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}
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/*
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@ -11309,6 +11389,8 @@ static int ssl_write_split( mbedtls_ssl_context *ssl,
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int mbedtls_ssl_write( mbedtls_ssl_context *ssl, const unsigned char *buf, size_t len )
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{
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int ret;
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volatile const unsigned char *buf_dup = buf;
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volatile size_t len_dup = len;
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MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write" ) );
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||||
|
|
@ -11340,7 +11422,12 @@ int mbedtls_ssl_write( mbedtls_ssl_context *ssl, const unsigned char *buf, size_
|
|||
|
||||
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write" ) );
|
||||
|
||||
return( ret );
|
||||
/* Secure against buffer substitution */
|
||||
if( buf_dup == buf && len_dup == len )
|
||||
{
|
||||
return( ret );
|
||||
}
|
||||
return( MBEDTLS_ERR_PLATFORM_FAULT_DETECTED );
|
||||
}
|
||||
|
||||
/*
|
||||
|
|
@ -12924,6 +13011,11 @@ int mbedtls_ssl_get_key_exchange_md_tls1_2( mbedtls_ssl_context *ssl,
|
|||
{
|
||||
int ret = 0;
|
||||
mbedtls_md_context_t ctx;
|
||||
volatile unsigned char* hash_dup = hash;
|
||||
volatile size_t *hashlen_dup = hashlen;
|
||||
volatile unsigned char* data_dup = data;
|
||||
volatile size_t data_len_dup = data_len;
|
||||
|
||||
mbedtls_md_handle_t md_info = mbedtls_md_info_from_type( md_alg );
|
||||
*hashlen = mbedtls_md_get_size( md_info );
|
||||
|
||||
|
|
@ -12969,7 +13061,13 @@ exit:
|
|||
mbedtls_ssl_pend_fatal_alert( ssl,
|
||||
MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR );
|
||||
|
||||
return( ret );
|
||||
/* Secure against buffer substitution */
|
||||
if( hash_dup == hash && hashlen_dup == hashlen &&
|
||||
data_dup == data && data_len_dup == data_len )
|
||||
{
|
||||
return( ret );
|
||||
}
|
||||
return( MBEDTLS_ERR_PLATFORM_FAULT_DETECTED );
|
||||
}
|
||||
#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 || \
|
||||
MBEDTLS_SSL_PROTO_TLS1_2 */
|
||||
|
|
|
|||
Loading…
Reference in a new issue