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Remove peer CRT from mbedtls_ssl_session if !KEEP_PEER_CERT

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This commit is contained in:
Hanno Becker 2019-02-06 15:40:27 +00:00
parent 4a2f8e584f
commit 2e6d34761f
5 changed files with 33 additions and 20 deletions
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5
include/mbedtls/ssl.h
View file

@ -851,14 +851,15 @@ struct mbedtls_ssl_session
unsigned char master[48]; /*!< the master secret */
#if defined(MBEDTLS_X509_CRT_PARSE_C)
#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
mbedtls_x509_crt *peer_cert; /*!< peer X.509 cert chain */
#if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
#else /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
/*! The digest of the peer's end-CRT. This must be kept to detect CRT
* changes during renegotiation, mitigating the triple handshake attack. */
unsigned char *peer_cert_digest;
size_t peer_cert_digest_len;
mbedtls_md_type_t peer_cert_digest_type;
#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
#endif /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
#endif /* MBEDTLS_X509_CRT_PARSE_C */
uint32_t verify_result; /*!< verification result */

3
include/mbedtls/ssl_cache.h
View file

@ -70,7 +70,8 @@ struct mbedtls_ssl_cache_entry
mbedtls_time_t timestamp; /*!< entry timestamp */
#endif
mbedtls_ssl_session session; /*!< entry session */
#if defined(MBEDTLS_X509_CRT_PARSE_C)
#if defined(MBEDTLS_X509_CRT_PARSE_C) && \
defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
mbedtls_x509_buf peer_cert; /*!< entry peer_cert */
#endif
mbedtls_ssl_cache_entry *next; /*!< chain pointer */

20
library/ssl_cache.c
View file

@ -100,7 +100,8 @@ int mbedtls_ssl_cache_get( void *data, mbedtls_ssl_session *session )
goto exit;
}
#if defined(MBEDTLS_X509_CRT_PARSE_C)
#if defined(MBEDTLS_X509_CRT_PARSE_C) && \
defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
/*
* Restore peer certificate (without rest of the original chain)
*/
@ -127,7 +128,7 @@ int mbedtls_ssl_cache_get( void *data, mbedtls_ssl_session *session )
goto exit;
}
}
#endif /* MBEDTLS_X509_CRT_PARSE_C */
#endif /* MBEDTLS_X509_CRT_PARSE_C && MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
ret = 0;
goto exit;
@ -247,7 +248,8 @@ int mbedtls_ssl_cache_set( void *data, const mbedtls_ssl_session *session )
#endif
}
#if defined(MBEDTLS_X509_CRT_PARSE_C)
#if defined(MBEDTLS_X509_CRT_PARSE_C) && \
defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
/*
* If we're reusing an entry, free its certificate first
*/
@ -256,7 +258,7 @@ int mbedtls_ssl_cache_set( void *data, const mbedtls_ssl_session *session )
mbedtls_free( cur->peer_cert.p );
memset( &cur->peer_cert, 0, sizeof(mbedtls_x509_buf) );
}
#endif /* MBEDTLS_X509_CRT_PARSE_C */
#endif /* MBEDTLS_X509_CRT_PARSE_C && MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
/* Copy the entire session; this temporarily makes a copy of the
* X.509 CRT structure even though we only want to store the raw CRT.
@ -270,7 +272,8 @@ int mbedtls_ssl_cache_set( void *data, const mbedtls_ssl_session *session )
goto exit;
}
#if defined(MBEDTLS_X509_CRT_PARSE_C)
#if defined(MBEDTLS_X509_CRT_PARSE_C) && \
defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
/* If present, free the X.509 structure and only store the raw CRT data. */
if( cur->session.peer_cert != NULL )
{
@ -291,7 +294,7 @@ int mbedtls_ssl_cache_set( void *data, const mbedtls_ssl_session *session )
mbedtls_free( cur->session.peer_cert );
cur->session.peer_cert = NULL;
}
#endif /* MBEDTLS_X509_CRT_PARSE_C */
#endif /* MBEDTLS_X509_CRT_PARSE_C && MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
ret = 0;
@ -333,9 +336,10 @@ void mbedtls_ssl_cache_free( mbedtls_ssl_cache_context *cache )
mbedtls_ssl_session_free( &prv->session );
#if defined(MBEDTLS_X509_CRT_PARSE_C)
#if defined(MBEDTLS_X509_CRT_PARSE_C) && \
defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
mbedtls_free( prv->peer_cert.p );
#endif /* MBEDTLS_X509_CRT_PARSE_C */
#endif /* MBEDTLS_X509_CRT_PARSE_C && MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
mbedtls_free( prv );
}

18
library/ssl_tls.c
View file

@ -9104,7 +9104,9 @@ int mbedtls_ssl_session_save( const mbedtls_ssl_session *session,
uint64_t start;
#endif
#if defined(MBEDTLS_X509_CRT_PARSE_C)
#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
size_t cert_len;
#endif
#endif
/*
@ -9175,6 +9177,7 @@ int mbedtls_ssl_session_save( const mbedtls_ssl_session *session,
* Peer's end-entity certificate
*/
#if defined(MBEDTLS_X509_CRT_PARSE_C)
#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
if( session->peer_cert == NULL )
cert_len = 0;
else
@ -9195,8 +9198,8 @@ int mbedtls_ssl_session_save( const mbedtls_ssl_session *session,
}
}
#else /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
/* Digest of peer certificate */
#if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
if( session->peer_cert_digest != NULL )
{
used += 1 /* type */ + 1 /* length */ + session->peer_cert_digest_len;
@ -9295,8 +9298,10 @@ static int ssl_session_load( mbedtls_ssl_session *session,
uint64_t start;
#endif
#if defined(MBEDTLS_X509_CRT_PARSE_C)
#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
size_t cert_len;
#endif /* MBEDTLS_X509_CRT_PARSE_C */
#endif
#endif
/*
* Check version identifier
@ -9359,10 +9364,11 @@ static int ssl_session_load( mbedtls_ssl_session *session,
/* Immediately clear invalid pointer values that have been read, in case
* we exit early before we replaced them with valid ones. */
#if defined(MBEDTLS_X509_CRT_PARSE_C)
#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
session->peer_cert = NULL;
#if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
#else
session->peer_cert_digest = NULL;
#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
#endif /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
#endif
#if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C)
session->ticket = NULL;
@ -9372,6 +9378,7 @@ static int ssl_session_load( mbedtls_ssl_session *session,
* Peer certificate
*/
#if defined(MBEDTLS_X509_CRT_PARSE_C)
#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
if( 3 > (size_t)( end - p ) )
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
@ -9407,8 +9414,7 @@ static int ssl_session_load( mbedtls_ssl_session *session,
p += cert_len;
}
#if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
#else /* defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
/* Deserialize CRT digest from the end of the ticket. */
if( 2 > (size_t)( end - p ) )
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );

7
tests/suites/test_suite_ssl.function
View file

@ -311,14 +311,14 @@ static int ssl_populate_session( mbedtls_ssl_session *session,
MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_TYPE;
session->peer_cert_digest_len =
MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_LEN;
#endif /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
#else /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
/* Move temporary CRT. */
session->peer_cert = mbedtls_calloc( 1, sizeof( *session->peer_cert ) );
if( session->peer_cert == NULL )
return( -1 );
*session->peer_cert = tmp_crt;
memset( &tmp_crt, 0, sizeof( tmp_crt ) );
#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
mbedtls_x509_crt_free( &tmp_crt );
}
@ -706,6 +706,7 @@ void ssl_serialize_session_save_load( int ticket_len, char *crt_file )
restored.master, sizeof( original.master ) ) == 0 );
#if defined(MBEDTLS_X509_CRT_PARSE_C)
#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
TEST_ASSERT( ( original.peer_cert == NULL ) ==
( restored.peer_cert == NULL ) );
if( original.peer_cert != NULL )
@ -716,7 +717,7 @@ void ssl_serialize_session_save_load( int ticket_len, char *crt_file )
restored.peer_cert->raw.p,
original.peer_cert->raw.len ) == 0 );
}
#if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
#else /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
TEST_ASSERT( original.peer_cert_digest_type ==
restored.peer_cert_digest_type );
TEST_ASSERT( original.peer_cert_digest_len ==