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Add peer CRT digest to session tickets

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This commit changes the format of session tickets to include
the digest of the peer's CRT if MBEDTLS_SSL_KEEP_PEER_CERTIFICATE
is disabled.

This commit does not yet remove the peer CRT itself.
This commit is contained in:
Hanno Becker 2019-02-06 15:23:38 +00:00
parent e4aeb76a2c
commit 4a2f8e584f
2 changed files with 107 additions and 5 deletions
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64
library/ssl_tls.c
View file

@ -9023,6 +9023,12 @@ const mbedtls_ssl_session *mbedtls_ssl_get_session_pointer( const mbedtls_ssl_co
#define SSL_SERIALIZED_SESSION_CONFIG_TICKET 0
#endif /* MBEDTLS_SSL_SESSION_TICKETS */
#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
#define SSL_SERIALIZED_SESSION_CONFIG_KEEP_CRT 1
#else
#define SSL_SERIALIZED_SESSION_CONFIG_KEEP_CRT 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
@ -9030,6 +9036,7 @@ const mbedtls_ssl_session *mbedtls_ssl_get_session_pointer( const mbedtls_ssl_co
#define SSL_SERIALIZED_SESSION_CONFIG_TRUNC_HMAC_BIT 4
#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_BITFLAG \
( (uint16_t) ( \
@ -9039,7 +9046,8 @@ const mbedtls_ssl_session *mbedtls_ssl_get_session_pointer( const mbedtls_ssl_co
( SSL_SERIALIZED_SESSION_CONFIG_MFL << SSL_SERIALIZED_SESSION_CONFIG_MFL_BIT ) | \
( 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_TICKET << SSL_SERIALIZED_SESSION_CONFIG_TICKET_BIT ) | \
( SSL_SERIALIZED_SESSION_CONFIG_KEEP_CRT << SSL_SERIALIZED_SESSION_CONFIG_KEEP_CRT_BIT ) ) )
static unsigned char ssl_serialized_session_header[] = {
MBEDTLS_VERSION_MAJOR,
@ -9073,6 +9081,8 @@ static unsigned char ssl_serialized_session_header[] = {
* opaque master[48]; // fixed length in the standard
* uint32 verify_result;
* opaque peer_cert<0..2^24-1>; // length 0 means no peer cert
* uint8_t peer_cert_digest_type;
* opaque peer_cert_digest<0..2^8-1>;
* opaque ticket<0..2^24-1>; // length 0 means no ticket
* uint32 ticket_lifetime;
* uint8 mfl_code; // up to 255 according to standard
@ -9184,6 +9194,31 @@ int mbedtls_ssl_session_save( const mbedtls_ssl_session *session,
p += cert_len;
}
}
/* 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;
if( used <= buf_len )
{
*p++ = (unsigned char) session->peer_cert_digest_type;
*p++ = (unsigned char) session->peer_cert_digest_len;
memcpy( p, session->peer_cert_digest,
session->peer_cert_digest_len );
p += session->peer_cert_digest_len;
}
}
else
{
used += 2;
if( used <= buf_len )
{
*p++ = (unsigned char) MBEDTLS_MD_NONE;
*p++ = 0;
}
}
#endif /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
#endif /* MBEDTLS_X509_CRT_PARSE_C */
/*
@ -9325,6 +9360,9 @@ static int ssl_session_load( mbedtls_ssl_session *session,
* we exit early before we replaced them with valid ones. */
#if defined(MBEDTLS_X509_CRT_PARSE_C)
session->peer_cert = NULL;
#if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
session->peer_cert_digest = NULL;
#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
#endif
#if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C)
session->ticket = NULL;
@ -9369,6 +9407,30 @@ static int ssl_session_load( mbedtls_ssl_session *session,
p += cert_len;
}
#if !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 );
session->peer_cert_digest_type = (mbedtls_md_type_t) *p++;
session->peer_cert_digest_len = (size_t) *p++;
if( session->peer_cert_digest_len != 0 )
{
if( session->peer_cert_digest_len > (size_t)( end - p ) )
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
session->peer_cert_digest =
mbedtls_calloc( 1, session->peer_cert_digest_len );
if( session->peer_cert_digest == NULL )
return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
memcpy( session->peer_cert_digest, p,
session->peer_cert_digest_len );
p += session->peer_cert_digest_len;
}
#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
#endif /* MBEDTLS_X509_CRT_PARSE_C */
/*

48
tests/suites/test_suite_ssl.function
View file

@ -1,6 +1,7 @@
/* BEGIN_HEADER */
#include <mbedtls/ssl.h>
#include <mbedtls/ssl_internal.h>
#include <mbedtls/md.h>
/*
* Helper function setting up inverse record transformations
@ -286,15 +287,40 @@ static int ssl_populate_session( mbedtls_ssl_session *session,
#if defined(MBEDTLS_X509_CRT_PARSE_C) && defined(MBEDTLS_FS_IO)
if( strlen( crt_file ) != 0 )
{
mbedtls_x509_crt tmp_crt;
int ret;
mbedtls_x509_crt_init( &tmp_crt );
ret = mbedtls_x509_crt_parse_file( &tmp_crt, crt_file );
if( ret != 0 )
return( ret );
#if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
/* Calculate digest of temporary CRT. */
session->peer_cert_digest =
mbedtls_calloc( 1, MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_LEN );
if( session->peer_cert_digest == NULL )
return( -1 );
ret = mbedtls_md( mbedtls_md_info_from_type(
MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_TYPE ),
tmp_crt.raw.p, tmp_crt.raw.len,
session->peer_cert_digest );
if( ret != 0 )
return( ret );
session->peer_cert_digest_type =
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 */
/* 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 ) );
ret = mbedtls_x509_crt_parse_file( session->peer_cert, crt_file );
if( ret != 0 )
return( ret );
mbedtls_x509_crt_free( &tmp_crt );
}
#else
(void) crt_file;
@ -690,7 +716,21 @@ void ssl_serialize_session_save_load( int ticket_len, char *crt_file )
restored.peer_cert->raw.p,
original.peer_cert->raw.len ) == 0 );
}
#endif
#if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
TEST_ASSERT( original.peer_cert_digest_type ==
restored.peer_cert_digest_type );
TEST_ASSERT( original.peer_cert_digest_len ==
restored.peer_cert_digest_len );
TEST_ASSERT( ( original.peer_cert_digest == NULL ) ==
( restored.peer_cert_digest == NULL ) );
if( original.peer_cert_digest != NULL )
{
TEST_ASSERT( memcmp( original.peer_cert_digest,
restored.peer_cert_digest,
original.peer_cert_digest_len ) == 0 );
}
#endif /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
#endif /* MBEDTLS_X509_CRT_PARSE_C */
TEST_ASSERT( original.verify_result == restored.verify_result );
#if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C)