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Remove compression field from SSL session if compression disabled

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This commit is contained in:
Hanno Becker 2019-07-03 14:16:13 +01:00 committed by Manuel Pégourié-Gonnard
parent 6852e95c2a
commit 8844055b0e
7 changed files with 91 additions and 15 deletions
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2
include/mbedtls/ssl.h
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@ -939,7 +939,9 @@ struct mbedtls_ssl_session
#if !defined(MBEDTLS_SSL_CONF_SINGLE_CIPHERSUITE)
int ciphersuite; /*!< chosen ciphersuite */
#endif /* MBEDTLS_SSL_CONF_SINGLE_CIPHERSUITE */
#if defined(MBEDTLS_ZLIB_SUPPORT)
int compression; /*!< chosen compression */
#endif /* MBEDTLS_ZLIB_SUPPORT */
size_t id_len; /*!< session id length */
unsigned char id[32]; /*!< session identifier */
unsigned char master[48]; /*!< the master secret */

15
include/mbedtls/ssl_internal.h
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@ -1780,4 +1780,19 @@ MBEDTLS_ALWAYS_INLINE static inline void mbedtls_ssl_pend_fatal_alert(
ssl->pending_fatal_alert_msg = message;
}
/*
* Getter functions for fields in SSL session.
*/
static inline int mbedtls_ssl_session_get_compression(
mbedtls_ssl_session const *session )
{
#if defined(MBEDTLS_ZLIB_SUPPORT)
return( session->compression );
#else
( (void) session );
return( MBEDTLS_SSL_COMPRESS_NULL );
#endif
}
#endif /* ssl_internal.h */

3
library/ssl_cache.c
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@ -86,7 +86,8 @@ int mbedtls_ssl_cache_get( void *data, mbedtls_ssl_session *session )
if( mbedtls_ssl_session_get_ciphersuite( session ) !=
mbedtls_ssl_session_get_ciphersuite( &entry->session ) ||
session->compression != entry->session.compression ||
mbedtls_ssl_session_get_compression( session ) !=
mbedtls_ssl_session_get_compression( &entry->session ) ||
session->id_len != entry->session.id_len )
{
continue;

6
library/ssl_cli.c
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@ -1837,7 +1837,7 @@ static int ssl_parse_server_hello( mbedtls_ssl_context *ssl )
if( n == 0 ||
mbedtls_ssl_get_renego_status( ssl ) != MBEDTLS_SSL_INITIAL_HANDSHAKE ||
mbedtls_ssl_session_get_ciphersuite( ssl->session_negotiate ) != i ||
ssl->session_negotiate->compression != comp ||
mbedtls_ssl_session_get_compression( ssl->session_negotiate ) != comp ||
ssl->session_negotiate->id_len != n ||
memcmp( ssl->session_negotiate->id, buf + 35, n ) != 0 )
{
@ -1868,7 +1868,9 @@ static int ssl_parse_server_hello( mbedtls_ssl_context *ssl )
#if !defined(MBEDTLS_SSL_CONF_SINGLE_CIPHERSUITE)
ssl->session_negotiate->ciphersuite = i;
#endif /* MBEDTLS_SSL_CONF_SINGLE_CIPHERSUITE */
#if defined(MBEDTLS_ZLIB_SUPPORT)
ssl->session_negotiate->compression = comp;
#endif
ssl->session_negotiate->id_len = n;
memcpy( ssl->session_negotiate->id, buf + 35, n );
}
@ -1932,7 +1934,9 @@ server_picked_valid_suite:
MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER );
return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
}
#if defined(MBEDTLS_ZLIB_SUPPORT)
ssl->session_negotiate->compression = comp;
#endif
ext = buf + 40 + n;

9
library/ssl_srv.c
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@ -1802,8 +1802,8 @@ read_record_header:
MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, compression",
buf + comp_offset + 1, comp_len );
ssl->session_negotiate->compression = MBEDTLS_SSL_COMPRESS_NULL;
#if defined(MBEDTLS_ZLIB_SUPPORT)
ssl->session_negotiate->compression = MBEDTLS_SSL_COMPRESS_NULL;
for( i = 0; i < comp_len; ++i )
{
if( buf[comp_offset + 1 + i] == MBEDTLS_SSL_COMPRESS_DEFLATE )
@ -1812,13 +1812,13 @@ read_record_header:
break;
}
}
#endif
/* See comments in ssl_write_client_hello() */
#if defined(MBEDTLS_SSL_PROTO_DTLS)
if( MBEDTLS_SSL_TRANSPORT_IS_DTLS( ssl->conf->transport ) )
ssl->session_negotiate->compression = MBEDTLS_SSL_COMPRESS_NULL;
#endif
#endif /* MBEDTLS_ZLIB_SUPPORT */
/* Do not parse the extensions if the protocol is SSLv3 */
#if defined(MBEDTLS_SSL_PROTO_SSL3)
@ -2881,12 +2881,13 @@ static int ssl_write_server_hello( mbedtls_ssl_context *ssl )
ciphersuite = mbedtls_ssl_session_get_ciphersuite( ssl->session_negotiate );
*p++ = (unsigned char)( ciphersuite >> 8 );
*p++ = (unsigned char)( ciphersuite );
*p++ = (unsigned char)( ssl->session_negotiate->compression );
*p++ = (unsigned char)(
mbedtls_ssl_session_get_compression( ssl->session_negotiate ) );
MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, chosen ciphersuite: %s",
mbedtls_ssl_get_ciphersuite_name( ciphersuite ) ) );
MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, compress alg.: 0x%02X",
ssl->session_negotiate->compression ) );
mbedtls_ssl_session_get_compression( ssl->session_negotiate ) ) );
/* Do not write the extensions if the protocol is SSLv3 */
#if defined(MBEDTLS_SSL_PROTO_SSL3)

65
library/ssl_tls.c
View File

@ -9327,6 +9327,12 @@ const mbedtls_ssl_session *mbedtls_ssl_get_session_pointer( const mbedtls_ssl_co
#define SSL_SERIALIZED_SESSION_CONFIG_KEEP_CRT 0
#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
#if defined(MBEDTLS_ZLIB_SUPPORT)
#define SSL_SERIALIZED_SESSION_CONFIG_COMPRESSION 1
#else
#define SSL_SERIALIZED_SESSION_CONFIG_COMPRESSION 0
#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
#define SSL_SERIALIZED_SESSION_CONFIG_TIME_BIT 0
#define SSL_SERIALIZED_SESSION_CONFIG_CRT_BIT 1
#define SSL_SERIALIZED_SESSION_CONFIG_CLIENT_TICKET_BIT 2
@ -9335,6 +9341,7 @@ const mbedtls_ssl_session *mbedtls_ssl_get_session_pointer( const mbedtls_ssl_co
#define SSL_SERIALIZED_SESSION_CONFIG_ETM_BIT 5
#define SSL_SERIALIZED_SESSION_CONFIG_TICKET_BIT 6
#define SSL_SERIALIZED_SESSION_CONFIG_KEEP_CRT_BIT 7
#define SSL_SERIALIZED_SESSION_CONFIG_COMPRESSION_BIT 8
#define SSL_SERIALIZED_SESSION_CONFIG_BITFLAG \
( (uint16_t) ( \
@ -9345,6 +9352,7 @@ const mbedtls_ssl_session *mbedtls_ssl_get_session_pointer( const mbedtls_ssl_co
( SSL_SERIALIZED_SESSION_CONFIG_TRUNC_HMAC << SSL_SERIALIZED_SESSION_CONFIG_TRUNC_HMAC_BIT ) | \
( SSL_SERIALIZED_SESSION_CONFIG_ETM << SSL_SERIALIZED_SESSION_CONFIG_ETM_BIT ) | \
( SSL_SERIALIZED_SESSION_CONFIG_TICKET << SSL_SERIALIZED_SESSION_CONFIG_TICKET_BIT ) | \
( SSL_SERIALIZED_SESSION_CONFIG_COMPRESSION << SSL_SERIALIZED_SESSION_CONFIG_COMPRESSION_BIT ) | \
( SSL_SERIALIZED_SESSION_CONFIG_KEEP_CRT << SSL_SERIALIZED_SESSION_CONFIG_KEEP_CRT_BIT ) ) )
static unsigned char ssl_serialized_session_header[] = {
@ -9450,12 +9458,28 @@ static int ssl_session_save( const mbedtls_ssl_session *session,
/*
* Basic mandatory fields
*/
used += 2 /* ciphersuite */
+ 1 /* compression */
+ 1 /* id_len */
+ sizeof( session->id )
+ sizeof( session->master )
+ 4; /* verify_result */
{
size_t const ciphersuite_len = 2;
#if defined(MBEDTLS_ZLIB_SUPPORT)
size_t const compression_len = 1;
#else
size_t const compression_len = 0;
#endif
size_t const id_len_len = 1;
size_t const id_len = 32;
size_t const master_len = 48;
size_t const verif_result_len = 4;
size_t const basic_len =
ciphersuite_len +
compression_len +
id_len_len +
id_len +
master_len +
verif_result_len;
used += basic_len;
}
if( used <= buf_len )
{
@ -9464,7 +9488,10 @@ static int ssl_session_save( const mbedtls_ssl_session *session,
*p++ = (unsigned char)( ( ciphersuite >> 8 ) & 0xFF );
*p++ = (unsigned char)( ( ciphersuite ) & 0xFF );
*p++ = (unsigned char)( session->compression & 0xFF );
#if defined(MBEDTLS_ZLIB_SUPPORT)
*p++ = (unsigned char)(
mbedtls_ssl_session_get_compression( session ) );
#endif
*p++ = (unsigned char)( session->id_len & 0xFF );
memcpy( p, session->id, 32 );
@ -9662,9 +9689,29 @@ static int ssl_session_load( mbedtls_ssl_session *session,
/*
* Basic mandatory fields
*/
{
size_t const ciphersuite_len = 2;
#if defined(MBEDTLS_ZLIB_SUPPORT)
size_t const compression_len = 1;
#else
size_t const compression_len = 0;
#endif
size_t const id_len_len = 1;
size_t const id_len = 32;
size_t const master_len = 48;
size_t const verif_result_len = 4;
if( 2 + 1 + 1 + 32 + 48 + 4 > (size_t)( end - p ) )
size_t const basic_len =
ciphersuite_len +
compression_len +
id_len_len +
id_len +
master_len +
verif_result_len;
if( basic_len > (size_t)( end - p ) )
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
}
ciphersuite = ( p[0] << 8 ) | p[1];
p += 2;
@ -9679,7 +9726,9 @@ static int ssl_session_load( mbedtls_ssl_session *session,
}
#endif
#if defined(MBEDTLS_ZLIB_SUPPORT)
session->compression = *p++;
#endif
session->id_len = *p++;
memcpy( session->id, p, 32 );

4
tests/suites/test_suite_ssl.function
View File

@ -286,7 +286,9 @@ static int ssl_populate_session( mbedtls_ssl_session *session,
#if !defined(MBEDTLS_SSL_CONF_SINGLE_CIPHERSUITE)
session->ciphersuite = 0xabcd;
#endif
#if defined(MBEDTLS_ZLIB_SUPPORT)
session->compression = 1;
#endif
session->id_len = sizeof( session->id );
memset( session->id, 66, session->id_len );
memset( session->master, 17, sizeof( session->master ) );
@ -716,7 +718,9 @@ void ssl_serialize_session_save_load( int ticket_len, char *crt_file )
#if !defined(MBEDTLS_SSL_CONF_SINGLE_CIPHERSUITE)
TEST_ASSERT( original.ciphersuite == restored.ciphersuite );
#endif
#if defined(MBEDTLS_ZLIB_SUPPORT)
TEST_ASSERT( original.compression == restored.compression );
#endif
TEST_ASSERT( original.id_len == restored.id_len );
TEST_ASSERT( memcmp( original.id,
restored.id, sizeof( original.id ) ) == 0 );