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Remove ciphersuite from SSL session if single suite hardcoded

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If MBEDTLS_SSL_SINGLE_CIPHERSUITE is enabled, the type

  mbedtls_ssl_ciphersuite_handle_t

is logically a boolean (concretely realized as `unsigned char`),
containing the invalid handle and the unique valid handle, which
represents the single enabled ciphersuite.

The SSL session structure mbedtls_ssl_session contains an instance
of mbedtls_ssl_ciphersuite_handle_t which is guaranteed to be valid,
and which is hence redundant in any two-valued implementation of
mbedtls_ssl_ciphersuite_handle_t.

This commit replaces read-uses of

  mbedtls_ssl_session::ciphersuite_info

by a getter functions which, and defines this getter function
either by just reading the field from the session structure
(in case MBEDTLS_SSL_SINGLE_CIPHERSUITE is disabled), or by
returning the single valid ciphersuite handle (in case
MBEDTLS_SSL_SINGLE_CIPHERSUITE is enabled) and removing the
field from mbedtls_ssl_session in this case.
This commit is contained in:
Hanno Becker 2019-06-26 15:31:31 +01:00
parent 6ace4657b6
commit e02758c9c8
7 changed files with 78 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/mbedtls/ssl.h
View File

@ -923,7 +923,9 @@ struct mbedtls_ssl_session
#if defined(MBEDTLS_HAVE_TIME)
mbedtls_time_t start; /*!< starting time */
#endif
#if !defined(MBEDTLS_SSL_SINGLE_CIPHERSUITE)
int ciphersuite; /*!< chosen ciphersuite */
#endif /* MBEDTLS_SSL_SINGLE_CIPHERSUITE */
int compression; /*!< chosen compression */
size_t id_len; /*!< session id length */
unsigned char id[32]; /*!< session identifier */

15
include/mbedtls/ssl_ciphersuites.h
View File

@ -681,6 +681,21 @@ static inline int mbedtls_ssl_ciphersuite_uses_server_signature(
}
}
#if !defined(MBEDTLS_SSL_SINGLE_CIPHERSUITE)
static inline int mbedtls_ssl_session_get_ciphersuite(
mbedtls_ssl_session const * session )
{
return( session->ciphersuite );
}
#else /* !MBEDTLS_SSL_SINGLE_CIPHERSUITE */
static inline int mbedtls_ssl_session_get_ciphersuite(
mbedtls_ssl_session const * session )
{
((void) session);
return( MBEDTLS_SSL_SUITE_ID( MBEDTLS_SSL_SINGLE_CIPHERSUITE ) );
}
#endif /* MBEDTLS_SSL_SINGLE_CIPHERSUITE */
const int *mbedtls_ssl_list_ciphersuites( void );
mbedtls_ssl_ciphersuite_handle_t mbedtls_ssl_ciphersuite_from_string( const char *ciphersuite_name );

5
library/ssl_cache.c
View File

@ -84,10 +84,13 @@ int mbedtls_ssl_cache_get( void *data, mbedtls_ssl_session *session )
continue;
#endif
if( session->ciphersuite != entry->session.ciphersuite ||
if( mbedtls_ssl_session_get_ciphersuite( session ) !=
mbedtls_ssl_session_get_ciphersuite( &entry->session ) ||
session->compression != entry->session.compression ||
session->id_len != entry->session.id_len )
{
continue;
}
if( memcmp( session->id, entry->session.id,
entry->session.id_len ) != 0 )

4
library/ssl_cli.c
View File

@ -1845,7 +1845,7 @@ static int ssl_parse_server_hello( mbedtls_ssl_context *ssl )
#if !defined(MBEDTLS_SSL_NO_SESSION_RESUMPTION)
if( n == 0 ||
mbedtls_ssl_get_renego_status( ssl ) != MBEDTLS_SSL_INITIAL_HANDSHAKE ||
ssl->session_negotiate->ciphersuite != i ||
mbedtls_ssl_session_get_ciphersuite( ssl->session_negotiate ) != i ||
ssl->session_negotiate->compression != comp ||
ssl->session_negotiate->id_len != n ||
memcmp( ssl->session_negotiate->id, buf + 35, n ) != 0 )
@ -1874,7 +1874,9 @@ static int ssl_parse_server_hello( mbedtls_ssl_context *ssl )
#if defined(MBEDTLS_HAVE_TIME)
ssl->session_negotiate->start = mbedtls_time( NULL );
#endif
#if !defined(MBEDTLS_SSL_SINGLE_CIPHERSUITE)
ssl->session_negotiate->ciphersuite = i;
#endif /* MBEDTLS_SSL_SINGLE_CIPHERSUITE */
ssl->session_negotiate->compression = comp;
ssl->session_negotiate->id_len = n;
memcpy( ssl->session_negotiate->id, buf + 35, n );

26
library/ssl_srv.c
View File

@ -1037,7 +1037,9 @@ static int ssl_parse_client_hello_v2( mbedtls_ssl_context *ssl )
size_t n;
unsigned int ciph_len, sess_len, chal_len;
unsigned char *buf, *p;
#if !defined(MBEDTLS_SSL_SINGLE_CIPHERSUITE)
mbedtls_ssl_ciphersuite_handle_t ciphersuite_info;
#endif
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse client hello v2" ) );
@ -1256,7 +1258,9 @@ static int ssl_parse_client_hello_v2( mbedtls_ssl_context *ssl )
if( ssl_ciphersuite_is_match( ssl, cur_info, NULL ) )
{
#if !defined(MBEDTLS_SSL_SINGLE_CIPHERSUITE)
ciphersuite_info = cur_info;
#endif
goto have_ciphersuite_v2;
}
@ -1289,9 +1293,9 @@ static int ssl_parse_client_hello_v2( mbedtls_ssl_context *ssl )
have_ciphersuite_v2:
#if !defined(MBEDTLS_SSL_SINGLE_CIPHERSUITE)
ssl->session_negotiate->ciphersuite =
mbedtls_ssl_suite_get_id( ciphersuite_info );
#if !defined(MBEDTLS_SSL_SINGLE_CIPHERSUITE)
ssl->handshake->ciphersuite_info = ciphersuite_info;
#endif
@ -1341,7 +1345,10 @@ static int ssl_parse_client_hello( mbedtls_ssl_context *ssl )
int extended_ms_seen = 0;
#endif
int handshake_failure = 0;
#if !defined(MBEDTLS_SSL_SINGLE_CIPHERSUITE)
mbedtls_ssl_ciphersuite_handle_t ciphersuite_info;
#endif
int major, minor;
#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \
@ -2175,7 +2182,9 @@ read_record_header:
if( ssl_ciphersuite_is_match( ssl, cur_info,
acceptable_ec_grp_ids) )
{
#if !defined(MBEDTLS_SSL_SINGLE_CIPHERSUITE)
ciphersuite_info = cur_info;
#endif /* MBEDTLS_SSL_SINGLE_CIPHERSUITE */
goto have_ciphersuite;
}
@ -2212,9 +2221,9 @@ read_record_header:
have_ciphersuite:
#if !defined(MBEDTLS_SSL_SINGLE_CIPHERSUITE)
ssl->session_negotiate->ciphersuite =
mbedtls_ssl_suite_get_id( ciphersuite_info );
#if !defined(MBEDTLS_SSL_SINGLE_CIPHERSUITE)
ssl->handshake->ciphersuite_info = ciphersuite_info;
#endif /* MBEDTLS_SSL_SINGLE_CIPHERSUITE */
@ -2354,7 +2363,7 @@ static void ssl_write_encrypt_then_mac_ext( mbedtls_ssl_context *ssl,
* encrypt-then-MAC response extension back to the client."
*/
suite = mbedtls_ssl_ciphersuite_from_id(
ssl->session_negotiate->ciphersuite );
mbedtls_ssl_session_get_ciphersuite( ssl->session_negotiate ) );
if( suite == MBEDTLS_SSL_CIPHERSUITE_INVALID_HANDLE )
{
*olen = 0;
@ -2695,6 +2704,7 @@ static int ssl_write_server_hello( mbedtls_ssl_context *ssl )
mbedtls_time_t t;
#endif
int ret;
int ciphersuite;
size_t olen, ext_len = 0, n;
unsigned char *buf, *p;
@ -2844,12 +2854,13 @@ static int ssl_write_server_hello( mbedtls_ssl_context *ssl )
MBEDTLS_SSL_DEBUG_MSG( 3, ( "%s session has been resumed",
mbedtls_ssl_handshake_get_resume( ssl->handshake ) ? "a" : "no" ) );
*p++ = (unsigned char)( ssl->session_negotiate->ciphersuite >> 8 );
*p++ = (unsigned char)( ssl->session_negotiate->ciphersuite );
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 );
MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, chosen ciphersuite: %s",
mbedtls_ssl_get_ciphersuite_name( ssl->session_negotiate->ciphersuite ) ) );
mbedtls_ssl_get_ciphersuite_name( ciphersuite ) ) );
MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, compress alg.: 0x%02X",
ssl->session_negotiate->compression ) );
@ -2898,7 +2909,8 @@ static int ssl_write_server_hello( mbedtls_ssl_context *ssl )
#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \
defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
if ( mbedtls_ssl_ciphersuite_uses_ec(
mbedtls_ssl_ciphersuite_from_id( ssl->session_negotiate->ciphersuite ) ) )
mbedtls_ssl_ciphersuite_from_id(
mbedtls_ssl_session_get_ciphersuite( ssl->session_negotiate ) ) ) )
{
ssl_write_supported_point_formats_ext( ssl, p + 2 + ext_len, &olen );
ext_len += olen;

27
library/ssl_tls.c
View File

@ -1378,7 +1378,7 @@ int mbedtls_ssl_derive_keys( mbedtls_ssl_context *ssl )
/* Populate transform structure */
ret = ssl_populate_transform( ssl->transform_negotiate,
ssl->session_negotiate->ciphersuite,
mbedtls_ssl_session_get_ciphersuite( ssl->session_negotiate ),
ssl->session_negotiate->master,
#if defined(MBEDTLS_SSL_SOME_MODES_USE_MAC)
#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
@ -8968,10 +8968,13 @@ uint32_t mbedtls_ssl_get_verify_result( const mbedtls_ssl_context *ssl )
const char *mbedtls_ssl_get_ciphersuite( const mbedtls_ssl_context *ssl )
{
int suite;
if( ssl == NULL || ssl->session == NULL )
return( NULL );
return mbedtls_ssl_get_ciphersuite_name( ssl->session->ciphersuite );
suite = mbedtls_ssl_session_get_ciphersuite( ssl->session );
return( mbedtls_ssl_get_ciphersuite_name( suite ) );
}
const char *mbedtls_ssl_get_version( const mbedtls_ssl_context *ssl )
@ -9393,8 +9396,10 @@ int mbedtls_ssl_session_save( const mbedtls_ssl_session *session,
if( used <= buf_len )
{
*p++ = (unsigned char)( ( session->ciphersuite >> 8 ) & 0xFF );
*p++ = (unsigned char)( ( session->ciphersuite ) & 0xFF );
const int ciphersuite =
mbedtls_ssl_session_get_ciphersuite( session );
*p++ = (unsigned char)( ( ciphersuite >> 8 ) & 0xFF );
*p++ = (unsigned char)( ( ciphersuite ) & 0xFF );
*p++ = (unsigned char)( session->compression & 0xFF );
@ -9532,6 +9537,7 @@ static int ssl_session_load( mbedtls_ssl_session *session,
{
const unsigned char *p = buf;
const unsigned char * const end = buf + len;
int ciphersuite;
#if defined(MBEDTLS_HAVE_TIME)
uint64_t start;
#endif
@ -9578,12 +9584,23 @@ static int ssl_session_load( mbedtls_ssl_session *session,
/*
* Basic mandatory fields
*/
if( 2 + 1 + 1 + 32 + 48 + 4 > (size_t)( end - p ) )
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
session->ciphersuite = ( p[0] << 8 ) | p[1];
ciphersuite = ( p[0] << 8 ) | p[1];
p += 2;
#if !defined(MBEDTLS_SSL_SINGLE_CIPHERSUITE)
session->ciphersuite = ciphersuite;
#else
if( ciphersuite !=
MBEDTLS_SSL_SUITE_ID( MBEDTLS_SSL_SINGLE_CIPHERSUITE ) )
{
return( MBEDTLS_ERR_SSL_VERSION_MISMATCH );
}
#endif
session->compression = *p++;
session->id_len = *p++;

4
tests/suites/test_suite_ssl.function
View File

@ -279,7 +279,9 @@ static int ssl_populate_session( mbedtls_ssl_session *session,
#if defined(MBEDTLS_HAVE_TIME)
session->start = mbedtls_time( NULL ) - 42;
#endif
#if !defined(MBEDTLS_SSL_CONF_SINGLE_CIPHERSUITE)
session->ciphersuite = 0xabcd;
#endif
session->compression = 1;
session->id_len = sizeof( session->id );
memset( session->id, 66, session->id_len );
@ -698,7 +700,9 @@ void ssl_serialize_session_save_load( int ticket_len, char *crt_file )
#if defined(MBEDTLS_HAVE_TIME)
TEST_ASSERT( original.start == restored.start );
#endif
#if !defined(MBEDTLS_SSL_CONF_SINGLE_CIPHERSUITE)
TEST_ASSERT( original.ciphersuite == restored.ciphersuite );
#endif
TEST_ASSERT( original.compression == restored.compression );
TEST_ASSERT( original.id_len == restored.id_len );
TEST_ASSERT( memcmp( original.id,