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Don't check ciphersuite and compression in SSL session cache lookup

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Session-ID based session resumption requires that the resumed session
is consistent with the client's ClientHello in terms of choice of
ciphersuite and choice of compression.

This check was previously assumed to be performed in the session cache
implementation, which seems wrong: The session cache should be an id-based
lookup only, and protocol specific checks should be left to Mbed TLS.

This commit
- adds an explicit ciphersuite and compression consistency check after
  the SSL session cache has been queried
- removes the ciphersuite and compression consistency check from
  Mbed TLS' session cache reference implementation.

Signed-off-by: Hanno Becker <hanno.becker@arm.com>
This commit is contained in:
Hanno Becker 2021-04-15 08:19:40 +01:00
parent fce7061a51
commit 64ce974180
2 changed files with 52 additions and 22 deletions
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10
library/ssl_cache.c
View File

@ -78,14 +78,12 @@ int mbedtls_ssl_cache_get( void *data, mbedtls_ssl_session *session )
continue;
#endif
if( session->ciphersuite != entry->session.ciphersuite ||
session->compression != entry->session.compression ||
session->id_len != entry->session.id_len )
continue;
if( memcmp( session->id, entry->session.id,
if( session->id_len != entry->session.id_len ||
memcmp( session->id, entry->session.id,
entry->session.id_len ) != 0 )
{
continue;
}
ret = mbedtls_ssl_session_copy( session, &entry->session );
if( ret != 0 )

64
library/ssl_srv.c
View File

@ -2765,6 +2765,53 @@ static int ssl_write_hello_verify_request( mbedtls_ssl_context *ssl )
}
#endif /* MBEDTLS_SSL_DTLS_HELLO_VERIFY */
static void ssl_check_id_based_session_resumption( mbedtls_ssl_context *ssl )
{
int ret;
mbedtls_ssl_session session_tmp = { 0 };
mbedtls_ssl_session * const session = ssl->session_negotiate;
/* Resume is 0 by default, see ssl_handshake_init().
* It may be already set to 1 by ssl_parse_session_ticket_ext(). */
if( ssl->handshake->resume == 1 )
return;
if( ssl->session_negotiate->id_len == 0 )
return;
if( ssl->conf->f_get_cache == NULL )
return;
#if defined(MBEDTLS_SSL_RENEGOTIATION)
if( ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE )
return;
#endif
session_tmp.id_len = session->id_len;
memcpy( session_tmp.id, session->id, session->id_len );
ret = ssl->conf->f_get_cache( ssl->conf->p_cache,
&session_tmp );
if( ret != 0 )
goto exit;
if( session->ciphersuite != session_tmp.ciphersuite ||
session->compression != session_tmp.compression )
{
/* Mismatch between cached and negotiated session */
goto exit;
}
/* Move semantics */
/* Zeroization of session_tmp happens at the end of the function. */
mbedtls_ssl_session_free( session );
*session = session_tmp;
MBEDTLS_SSL_DEBUG_MSG( 3, ( "session successfully restored from cache" ) );
ssl->handshake->resume = 1;
exit:
mbedtls_platform_zeroize( &session_tmp, sizeof( session_tmp ) );
}
static int ssl_write_server_hello( mbedtls_ssl_context *ssl )
{
#if defined(MBEDTLS_HAVE_TIME)
@ -2835,22 +2882,7 @@ static int ssl_write_server_hello( mbedtls_ssl_context *ssl )
MBEDTLS_SSL_DEBUG_BUF( 3, "server hello, random bytes", buf + 6, 32 );
/*
* Resume is 0 by default, see ssl_handshake_init().
* It may be already set to 1 by ssl_parse_session_ticket_ext().
* If not, try looking up session ID in our cache.
*/
if( ssl->handshake->resume == 0 &&
#if defined(MBEDTLS_SSL_RENEGOTIATION)
ssl->renego_status == MBEDTLS_SSL_INITIAL_HANDSHAKE &&
#endif
ssl->session_negotiate->id_len != 0 &&
ssl->conf->f_get_cache != NULL &&
ssl->conf->f_get_cache( ssl->conf->p_cache, ssl->session_negotiate ) == 0 )
{
MBEDTLS_SSL_DEBUG_MSG( 3, ( "session successfully restored from cache" ) );
ssl->handshake->resume = 1;
}
ssl_check_id_based_session_resumption( ssl );
if( ssl->handshake->resume == 0 )
{