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Move size check for records

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This commit is contained in:
Hanno Becker 2018-08-06 11:52:54 +01:00
parent 67bc7c3a38
commit b50a253a87
1 changed files with 17 additions and 8 deletions
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25
library/ssl_tls.c
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@ -1413,14 +1413,6 @@ static int ssl_encrypt_buf( mbedtls_ssl_context *ssl )
MBEDTLS_SSL_DEBUG_BUF( 4, "before encrypt: output payload", MBEDTLS_SSL_DEBUG_BUF( 4, "before encrypt: output payload",
ssl->out_msg, ssl->out_msglen ); ssl->out_msg, ssl->out_msglen );
if( ssl->out_msglen > MBEDTLS_SSL_OUT_CONTENT_LEN )
{
MBEDTLS_SSL_DEBUG_MSG( 1, ( "Record content %u too large, maximum %d",
(unsigned) ssl->out_msglen,
MBEDTLS_SSL_OUT_CONTENT_LEN ) );
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
}
/* /*
* Add MAC before if needed * Add MAC before if needed
*/ */
@ -3166,6 +3158,23 @@ int mbedtls_ssl_write_handshake_msg( mbedtls_ssl_context *ssl )
} }
#endif #endif
/* Double-check that we did not exceed the bounds
* of the outgoing record buffer.
* This should never fail as the various message
* writing functions must obey the bounds of the
* outgoing record buffer, but better be safe.
*
* Note: We deliberately do not check for the MTU or MFL here.
*/
if( ssl->out_msglen > MBEDTLS_SSL_OUT_CONTENT_LEN )
{
MBEDTLS_SSL_DEBUG_MSG( 1, ( "Record too large: "
"size %u, maximum %u",
(unsigned) ssl->out_msglen,
(unsigned) MBEDTLS_SSL_OUT_CONTENT_LEN ) );
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
}
/* /*
* Fill handshake headers * Fill handshake headers
*/ */