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Fix max_fragment_length with DTLS

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Manuel Pégourié-Gonnard 2014-10-13 17:55:52 +02:00 committed by Paul Bakker
parent 23cad339c4
commit 37e08e1689
3 changed files with 60 additions and 7 deletions
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6
include/polarssl/ssl.h
View file

@ -1946,6 +1946,12 @@ int ssl_read( ssl_context *ssl, unsigned char *buf, size_t len );
* \note When this function returns POLARSSL_ERR_NET_WANT_WRITE,
* it must be called later with the *same* arguments,
* until it returns a positive value.
*
* \note When DTLS is in use, and a maximum fragment length was
* either set with \c ssl_set_max_frag_len() or negotiated by
* the peer, len must not not be greater than the maximum
* fragment length, or POLARSSL_ERR_SSL_BAD_INPUT_DATA is
* returned.
*/
int ssl_write( ssl_context *ssl, const unsigned char *buf, size_t len );

28
library/ssl_tls.c
View file

@ -5894,8 +5894,9 @@ int ssl_read( ssl_context *ssl, unsigned char *buf, size_t len )
int ssl_write( ssl_context *ssl, const unsigned char *buf, size_t len )
{
int ret;
size_t n;
unsigned int max_len = SSL_MAX_CONTENT_LEN;
#if defined(POLARSSL_SSL_MAX_FRAGMENT_LENGTH)
unsigned int max_len;
#endif
SSL_DEBUG_MSG( 2, ( "=> write" ) );
@ -5922,9 +5923,22 @@ int ssl_write( ssl_context *ssl, const unsigned char *buf, size_t len )
{
max_len = mfl_code_to_length[ssl->session_out->mfl_code];
}
#endif /* POLARSSL_SSL_MAX_FRAGMENT_LENGTH */
n = ( len < max_len) ? len : max_len;
if( len > max_len )
{
#if defined(POLARSSL_SSL_PROTO_DTLS)
if( ssl->transport == SSL_TRANSPORT_DATAGRAM )
{
SSL_DEBUG_MSG( 1, ( "fragment larger than the (negotiated) "
"maximum fragment length: %d > %d",
len, max_len ) );
return( POLARSSL_ERR_SSL_BAD_INPUT_DATA );
}
else
#endif
len = max_len;
}
#endif /* POLARSSL_SSL_MAX_FRAGMENT_LENGTH */
if( ssl->out_left != 0 )
{
@ -5936,9 +5950,9 @@ int ssl_write( ssl_context *ssl, const unsigned char *buf, size_t len )
}
else
{
ssl->out_msglen = n;
ssl->out_msglen = len;
ssl->out_msgtype = SSL_MSG_APPLICATION_DATA;
memcpy( ssl->out_msg, buf, n );
memcpy( ssl->out_msg, buf, len );
if( ( ret = ssl_write_record( ssl ) ) != 0 )
{
@ -5949,7 +5963,7 @@ int ssl_write( ssl_context *ssl, const unsigned char *buf, size_t len )
SSL_DEBUG_MSG( 2, ( "<= write" ) );
return( (int) n );
return( (int) len );
}
/*

33
tests/ssl-opt.sh
View file

@ -748,6 +748,39 @@ run_test "Max fragment length: gnutls server" \
-c "client hello, adding max_fragment_length extension" \
-c "found max_fragment_length extension"
run_test "Max fragment length: client, message just fits" \
"$P_SRV debug_level=3" \
"$P_CLI debug_level=3 max_frag_len=2048 request_size=2048" \
0 \
-c "client hello, adding max_fragment_length extension" \
-s "found max fragment length extension" \
-s "server hello, max_fragment_length extension" \
-c "found max_fragment_length extension" \
-c "2048 bytes written in 1 fragments" \
-s "2048 bytes read"
run_test "Max fragment length: client, larger message" \
"$P_SRV debug_level=3" \
"$P_CLI debug_level=3 max_frag_len=2048 request_size=2345" \
0 \
-c "client hello, adding max_fragment_length extension" \
-s "found max fragment length extension" \
-s "server hello, max_fragment_length extension" \
-c "found max_fragment_length extension" \
-c "2345 bytes written in 2 fragments" \
-s "2048 bytes read" \
-s "297 bytes read"
run_test "Max fragment length: client, larger message" \
"$P_SRV debug_level=3 dtls=1" \
"$P_CLI debug_level=3 dtls=1 max_frag_len=2048 request_size=2345" \
1 \
-c "client hello, adding max_fragment_length extension" \
-s "found max fragment length extension" \
-s "server hello, max_fragment_length extension" \
-c "found max_fragment_length extension" \
-c "fragment larger than.*maximum"
# Tests for renegotiation
run_test "Renegotiation: none, for reference" \