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Add run-time check for handshake message size in ssl_write_record

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This commit is contained in:
Hanno Becker 2017-09-18 10:55:54 +01:00
parent d33f1ca34c
commit 9648f8b59c
1 changed files with 9 additions and 0 deletions
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9
library/ssl_tls.c
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@ -2742,6 +2742,15 @@ int mbedtls_ssl_write_record( mbedtls_ssl_context *ssl )
if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
{ {
/* Make room for the additional DTLS fields */ /* Make room for the additional DTLS fields */
if( MBEDTLS_SSL_MAX_CONTENT_LEN - ssl->out_msglen < 8 )
{
MBEDTLS_SSL_DEBUG_MSG( 1, ( "DTLS handshake message too large: "
"size %u, maximum %u",
(unsigned) ( ssl->in_hslen - 4 ),
(unsigned) ( MBEDTLS_SSL_MAX_CONTENT_LEN - 12 ) ) );
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
}
memmove( ssl->out_msg + 12, ssl->out_msg + 4, len - 4 ); memmove( ssl->out_msg + 12, ssl->out_msg + 4, len - 4 );
ssl->out_msglen += 8; ssl->out_msglen += 8;
len += 8; len += 8;