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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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3
include/polarssl/ssl.h
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@ -616,6 +616,9 @@ struct _ssl_handshake_params
ssl_key_cert *sni_key_cert; /*!< key/cert list from SNI */ ssl_key_cert *sni_key_cert; /*!< key/cert list from SNI */
#endif #endif
#endif /* POLARSSL_X509_CRT_PARSE_C */ #endif /* POLARSSL_X509_CRT_PARSE_C */
#if defined(POLARSSL_SSL_PROTO_DTLS)
unsigned int msg_seq; /*!< DTLS handshake sequence number */
#endif
/* /*
* Checksum contexts * Checksum contexts

16
library/ssl_srv.c
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@ -1203,6 +1203,8 @@ static int ssl_parse_client_hello( ssl_context *ssl )
else else
n = ssl->in_msglen; n = ssl->in_msglen;
SSL_DEBUG_BUF( 4, "record contents", buf, n );
ssl->handshake->update_checksum( ssl, buf, n ); ssl->handshake->update_checksum( ssl, buf, n );
/* /*
@ -1211,7 +1213,17 @@ static int ssl_parse_client_hello( ssl_context *ssl )
#if defined(POLARSSL_SSL_PROTO_DTLS) #if defined(POLARSSL_SSL_PROTO_DTLS)
if( ssl->transport == SSL_TRANSPORT_DATAGRAM ) 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( buf + 4, buf + 12, n - 12 ); memmove( buf + 4, buf + 12, n - 12 );
n -= 8; n -= 8;
@ -1233,8 +1245,6 @@ static int ssl_parse_client_hello( ssl_context *ssl )
* 42+y . 41+z compression algs * 42+y . 41+z compression algs
* .. . .. extensions * .. . .. extensions
*/ */
SSL_DEBUG_BUF( 4, "record contents", buf, n );
SSL_DEBUG_MSG( 3, ( "client hello v3, handshake type: %d", SSL_DEBUG_MSG( 3, ( "client hello v3, handshake type: %d",
buf[0] ) ); buf[0] ) );
SSL_DEBUG_MSG( 3, ( "client hello v3, handshake len.: %d", SSL_DEBUG_MSG( 3, ( "client hello v3, handshake len.: %d",

24
library/ssl_tls.c
View File

@ -1934,12 +1934,19 @@ int ssl_write_record( ssl_context *ssl )
#if defined(POLARSSL_SSL_PROTO_DTLS) #if defined(POLARSSL_SSL_PROTO_DTLS)
if( ssl->transport == SSL_TRANSPORT_DATAGRAM ) 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; ssl->out_msglen += 8;
len += 8; len += 8;
// TODO: DTLS: fill additional fields correctly /* Write message_seq and update it */
memset( ssl->out_msg + 4, 0x00, 8 ); 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 */ #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 defined(POLARSSL_SSL_PROTO_DTLS)
if( ssl->transport == SSL_TRANSPORT_DATAGRAM ) 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 ); memmove( ssl->in_msg + 4, ssl->in_msg + 12, ssl->in_hslen - 12 );
ssl->in_hslen -= 8; ssl->in_hslen -= 8;