2 * SSL session cache implementation
4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
5 * SPDX-License-Identifier: Apache-2.0
7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
8 * not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
19 * This file is part of mbed TLS (https://tls.mbed.org)
22 * These session callbacks use a simple chained list
23 * to store and retrieve the session information.
26 #if !defined(MBEDTLS_CONFIG_FILE)
27 #include "mbedtls/config.h"
29 #include MBEDTLS_CONFIG_FILE
32 #if defined(MBEDTLS_SSL_CACHE_C)
34 #if defined(MBEDTLS_PLATFORM_C)
35 #include "mbedtls/platform.h"
38 #define mbedtls_calloc calloc
39 #define mbedtls_free free
42 #include "mbedtls/ssl_cache.h"
46 void mbedtls_ssl_cache_init( mbedtls_ssl_cache_context *cache )
48 memset( cache, 0, sizeof( mbedtls_ssl_cache_context ) );
50 cache->timeout = MBEDTLS_SSL_CACHE_DEFAULT_TIMEOUT;
51 cache->max_entries = MBEDTLS_SSL_CACHE_DEFAULT_MAX_ENTRIES;
53 #if defined(MBEDTLS_THREADING_C)
54 mbedtls_mutex_init( &cache->mutex );
58 int mbedtls_ssl_cache_get( void *data, mbedtls_ssl_session *session )
61 #if defined(MBEDTLS_HAVE_TIME)
62 mbedtls_time_t t = mbedtls_time( NULL );
64 mbedtls_ssl_cache_context *cache = (mbedtls_ssl_cache_context *) data;
65 mbedtls_ssl_cache_entry *cur, *entry;
67 #if defined(MBEDTLS_THREADING_C)
68 if( mbedtls_mutex_lock( &cache->mutex ) != 0 )
80 #if defined(MBEDTLS_HAVE_TIME)
81 if( cache->timeout != 0 &&
82 (int) ( t - entry->timestamp ) > cache->timeout )
86 if( session->ciphersuite != entry->session.ciphersuite ||
87 session->compression != entry->session.compression ||
88 session->id_len != entry->session.id_len )
91 if( memcmp( session->id, entry->session.id,
92 entry->session.id_len ) != 0 )
95 memcpy( session->master, entry->session.master, 48 );
97 session->verify_result = entry->session.verify_result;
99 #if defined(MBEDTLS_X509_CRT_PARSE_C)
101 * Restore peer certificate (without rest of the original chain)
103 if( entry->peer_cert.p != NULL )
105 if( ( session->peer_cert = mbedtls_calloc( 1,
106 sizeof(mbedtls_x509_crt) ) ) == NULL )
112 mbedtls_x509_crt_init( session->peer_cert );
113 if( mbedtls_x509_crt_parse( session->peer_cert, entry->peer_cert.p,
114 entry->peer_cert.len ) != 0 )
116 mbedtls_free( session->peer_cert );
117 session->peer_cert = NULL;
122 #endif /* MBEDTLS_X509_CRT_PARSE_C */
129 #if defined(MBEDTLS_THREADING_C)
130 if( mbedtls_mutex_unlock( &cache->mutex ) != 0 )
137 int mbedtls_ssl_cache_set( void *data, const mbedtls_ssl_session *session )
140 #if defined(MBEDTLS_HAVE_TIME)
141 mbedtls_time_t t = mbedtls_time( NULL ), oldest = 0;
142 mbedtls_ssl_cache_entry *old = NULL;
144 mbedtls_ssl_cache_context *cache = (mbedtls_ssl_cache_context *) data;
145 mbedtls_ssl_cache_entry *cur, *prv;
148 #if defined(MBEDTLS_THREADING_C)
149 if( ( ret = mbedtls_mutex_lock( &cache->mutex ) ) != 0 )
160 #if defined(MBEDTLS_HAVE_TIME)
161 if( cache->timeout != 0 &&
162 (int) ( t - cur->timestamp ) > cache->timeout )
165 break; /* expired, reuse this slot, update timestamp */
169 if( memcmp( session->id, cur->session.id, cur->session.id_len ) == 0 )
170 break; /* client reconnected, keep timestamp for session id */
172 #if defined(MBEDTLS_HAVE_TIME)
173 if( oldest == 0 || cur->timestamp < oldest )
175 oldest = cur->timestamp;
186 #if defined(MBEDTLS_HAVE_TIME)
188 * Reuse oldest entry if max_entries reached
190 if( count >= cache->max_entries )
200 #else /* MBEDTLS_HAVE_TIME */
202 * Reuse first entry in chain if max_entries reached,
203 * but move to last place
205 if( count >= cache->max_entries )
207 if( cache->chain == NULL )
214 cache->chain = cur->next;
218 #endif /* MBEDTLS_HAVE_TIME */
222 * max_entries not reached, create new entry
224 cur = mbedtls_calloc( 1, sizeof(mbedtls_ssl_cache_entry) );
237 #if defined(MBEDTLS_HAVE_TIME)
242 memcpy( &cur->session, session, sizeof( mbedtls_ssl_session ) );
244 #if defined(MBEDTLS_X509_CRT_PARSE_C)
246 * If we're reusing an entry, free its certificate first
248 if( cur->peer_cert.p != NULL )
250 mbedtls_free( cur->peer_cert.p );
251 memset( &cur->peer_cert, 0, sizeof(mbedtls_x509_buf) );
255 * Store peer certificate
257 if( session->peer_cert != NULL )
259 cur->peer_cert.p = mbedtls_calloc( 1, session->peer_cert->raw.len );
260 if( cur->peer_cert.p == NULL )
266 memcpy( cur->peer_cert.p, session->peer_cert->raw.p,
267 session->peer_cert->raw.len );
268 cur->peer_cert.len = session->peer_cert->raw.len;
270 cur->session.peer_cert = NULL;
272 #endif /* MBEDTLS_X509_CRT_PARSE_C */
277 #if defined(MBEDTLS_THREADING_C)
278 if( mbedtls_mutex_unlock( &cache->mutex ) != 0 )
285 #if defined(MBEDTLS_HAVE_TIME)
286 void mbedtls_ssl_cache_set_timeout( mbedtls_ssl_cache_context *cache, int timeout )
288 if( timeout < 0 ) timeout = 0;
290 cache->timeout = timeout;
292 #endif /* MBEDTLS_HAVE_TIME */
294 void mbedtls_ssl_cache_set_max_entries( mbedtls_ssl_cache_context *cache, int max )
296 if( max < 0 ) max = 0;
298 cache->max_entries = max;
301 void mbedtls_ssl_cache_free( mbedtls_ssl_cache_context *cache )
303 mbedtls_ssl_cache_entry *cur, *prv;
312 mbedtls_ssl_session_free( &prv->session );
314 #if defined(MBEDTLS_X509_CRT_PARSE_C)
315 mbedtls_free( prv->peer_cert.p );
316 #endif /* MBEDTLS_X509_CRT_PARSE_C */
321 #if defined(MBEDTLS_THREADING_C)
322 mbedtls_mutex_free( &cache->mutex );
327 #endif /* MBEDTLS_SSL_CACHE_C */