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Corrections after the code review

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Signed-off-by: TRodziewicz <tomasz.rodziewicz@mobica.com>
This commit is contained in:
TRodziewicz
2021-05-20 14:46:20 +02:00
parent d807060e0a
commit 4ca18aae38
9 changed files with 339 additions and 33 deletions
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66
library/ssl_msg.c
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@ -86,6 +86,70 @@ int mbedtls_ssl_check_timer( mbedtls_ssl_context *ssl )
return( 0 );
}
static int ssl_parse_record_header( mbedtls_ssl_context const *ssl,
unsigned char *buf,
size_t len,
mbedtls_record *rec );
int mbedtls_ssl_check_record( mbedtls_ssl_context const *ssl,
unsigned char *buf,
size_t buflen )
{
int ret = 0;
MBEDTLS_SSL_DEBUG_MSG( 1, ( "=> mbedtls_ssl_check_record" ) );
MBEDTLS_SSL_DEBUG_BUF( 3, "record buffer", buf, buflen );
/* We don't support record checking in TLS because
* (a) there doesn't seem to be a usecase for it, and
* (b) In TLS 1.0, CBC record decryption has state
* and we'd need to backup the transform here.
*/
if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_STREAM )
{
ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
goto exit;
}
#if defined(MBEDTLS_SSL_PROTO_DTLS)
else
{
mbedtls_record rec;
ret = ssl_parse_record_header( ssl, buf, buflen, &rec );
if( ret != 0 )
{
MBEDTLS_SSL_DEBUG_RET( 3, "ssl_parse_record_header", ret );
goto exit;
}
if( ssl->transform_in != NULL )
{
ret = mbedtls_ssl_decrypt_buf( ssl, ssl->transform_in, &rec );
if( ret != 0 )
{
MBEDTLS_SSL_DEBUG_RET( 3, "mbedtls_ssl_decrypt_buf", ret );
goto exit;
}
}
}
#endif /* MBEDTLS_SSL_PROTO_DTLS */
exit:
/* On success, we have decrypted the buffer in-place, so make
* sure we don't leak any plaintext data. */
mbedtls_platform_zeroize( buf, buflen );
/* For the purpose of this API, treat messages with unexpected CID
* as well as such from future epochs as unexpected. */
if( ret == MBEDTLS_ERR_SSL_UNEXPECTED_CID ||
ret == MBEDTLS_ERR_SSL_EARLY_MESSAGE )
{
ret = MBEDTLS_ERR_SSL_UNEXPECTED_RECORD;
}
MBEDTLS_SSL_DEBUG_MSG( 1, ( "<= mbedtls_ssl_check_record" ) );
return( ret );
}
#define SSL_DONT_FORCE_FLUSH 0
#define SSL_FORCE_FLUSH 1
@ -4960,7 +5024,7 @@ int mbedtls_ssl_get_record_expansion( const mbedtls_ssl_context *ssl )
* more than the block size of the underlying cipher. */
transform_expansion += block_size;
/* For TLS 1.1 or higher, an explicit IV is added
/* For TLS 1.2 or higher, an explicit IV is added
* after the record header. */
#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_3 )