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Reduce dependency of ssl_prepare_record_content() on in_xxx fields

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This commit is contained in:
Hanno Becker 2019-07-12 09:35:58 +01:00
parent d8bf8ceeb4
commit 58ef0bf19f
1 changed files with 8 additions and 6 deletions
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14
library/ssl_tls.c
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@ -5176,6 +5176,8 @@ static int ssl_prepare_record_content( mbedtls_ssl_context *ssl,
#endif /* MBEDTLS_SSL_HW_RECORD_ACCEL */
if( !done && ssl->transform_in != NULL )
{
unsigned char const old_msg_type = rec->type;
if( ( ret = mbedtls_ssl_decrypt_buf( ssl, ssl->transform_in,
rec ) ) != 0 )
{
@ -5194,10 +5196,10 @@ static int ssl_prepare_record_content( mbedtls_ssl_context *ssl,
return( ret );
}
if( ssl->in_msgtype != rec->type )
if( old_msg_type != rec->type )
{
MBEDTLS_SSL_DEBUG_MSG( 4, ( "record type after decrypt (before %d): %d",
ssl->in_msgtype, rec->type ) );
old_msg_type, rec->type ) );
}
/* The record content type may change during decryption,
@ -5214,7 +5216,7 @@ static int ssl_prepare_record_content( mbedtls_ssl_context *ssl,
ssl->in_len[1] = (unsigned char)( rec->data_len );
MBEDTLS_SSL_DEBUG_BUF( 4, "input payload after decrypt",
ssl->in_msg, ssl->in_msglen );
rec->buf + rec->data_offset, rec->data_len );
#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
/* We have already checked the record content type
@ -5224,18 +5226,18 @@ static int ssl_prepare_record_content( mbedtls_ssl_context *ssl,
* Since with the use of CIDs, the record content type
* might change during decryption, re-check the record
* content type, but treat a failure as fatal this time. */
if( ssl_check_record_type( ssl->in_msgtype ) )
if( ssl_check_record_type( rec->type ) )
{
MBEDTLS_SSL_DEBUG_MSG( 1, ( "unknown record type" ) );
return( MBEDTLS_ERR_SSL_INVALID_RECORD );
}
#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
if( ssl->in_msglen == 0 )
if( rec->data_len == 0 )
{
#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3
&& ssl->in_msgtype != MBEDTLS_SSL_MSG_APPLICATION_DATA )
&& rec->type != MBEDTLS_SSL_MSG_APPLICATION_DATA )
{
/* TLS v1.2 explicitly disallows zero-length messages which are not application data */
MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid zero-length message type: %d", ssl->in_msgtype ) );