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Write new DTLS handshake fields correctly

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Manuel Pégourié-Gonnard
2014-02-18 18:50:02 +01:00
committed by Paul Bakker
parent ce441b3442
commit e89bcf05da
3 changed files with 36 additions and 7 deletions
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24
library/ssl_tls.c
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@ -1934,12 +1934,19 @@ int ssl_write_record( ssl_context *ssl )
#if defined(POLARSSL_SSL_PROTO_DTLS)
if( ssl->transport == SSL_TRANSPORT_DATAGRAM )
{
memmove( ssl->out_msg + 12, ssl->out_msg + 4, ssl->out_msglen - 4 );
/* Make room for the additional DTLS fields */
memmove( ssl->out_msg + 12, ssl->out_msg + 4, len - 4 );
ssl->out_msglen += 8;
len += 8;
// TODO: DTLS: fill additional fields correctly
memset( ssl->out_msg + 4, 0x00, 8 );
/* Write message_seq and update it */
ssl->out_msg[4] = ( ssl->handshake->msg_seq >> 8 ) & 0xFF;
ssl->out_msg[5] = ( ssl->handshake->msg_seq ) & 0xFF;
++( ssl->handshake->msg_seq );
/* We don't fragment, so frag_offset = 0 and frag_len = len */
memset( ssl->out_msg + 6, 0x00, 3 );
memcpy( ssl->out_msg + 9, ssl->out_msg + 1, 3 );
}
#endif /* POLARSSL_SSL_PROTO_DTLS */
@ -2048,7 +2055,16 @@ static int ssl_prepare_handshake_record( ssl_context *ssl )
#if defined(POLARSSL_SSL_PROTO_DTLS)
if( ssl->transport == SSL_TRANSPORT_DATAGRAM )
{
// TODO: DTLS: actually use the additional fields before removing them!
// TODO: DTLS: check message_seq
/* For now we don't support fragmentation, so make sure
* fragment_offset == 0 and fragment_length == length */
if( ssl->in_msg[6] != 0 || ssl->in_msg[7] != 0 || ssl->in_msg[8] != 0 ||
memcmp( ssl->in_msg + 1, ssl->in_msg + 9, 3 ) != 0 )
{
SSL_DEBUG_MSG( 1, ( "handshake fragmentation not supported" ) );
return( POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE );
}
memmove( ssl->in_msg + 4, ssl->in_msg + 12, ssl->in_hslen - 12 );
ssl->in_hslen -= 8;