source: azure_iot_hub_mbedtls/trunk/mbedtls-2.16.1/library/ssl_cache.c@ 398

Last change on this file since 398 was 398, checked in by coas-nagasima, 5 years ago

mbedTLS版Azure IoT Hub接続サンプルのソースコードを追加
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File size: 8.0 KB
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1/*
2 * SSL session cache implementation
3 *
4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
5 * SPDX-License-Identifier: Apache-2.0
6 *
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
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
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.
18 *
19 * This file is part of mbed TLS (https://tls.mbed.org)
20 */
21/*
22 * These session callbacks use a simple chained list
23 * to store and retrieve the session information.
24 */
25
26#if !defined(MBEDTLS_CONFIG_FILE)
27#include "mbedtls/config.h"
28#else
29#include MBEDTLS_CONFIG_FILE
30#endif
31
32#if defined(MBEDTLS_SSL_CACHE_C)
33
34#if defined(MBEDTLS_PLATFORM_C)
35#include "mbedtls/platform.h"
36#else
37#include <stdlib.h>
38#define mbedtls_calloc calloc
39#define mbedtls_free free
40#endif
41
42#include "mbedtls/ssl_cache.h"
43
44#include <string.h>
45
46void mbedtls_ssl_cache_init( mbedtls_ssl_cache_context *cache )
47{
48 memset( cache, 0, sizeof( mbedtls_ssl_cache_context ) );
49
50 cache->timeout = MBEDTLS_SSL_CACHE_DEFAULT_TIMEOUT;
51 cache->max_entries = MBEDTLS_SSL_CACHE_DEFAULT_MAX_ENTRIES;
52
53#if defined(MBEDTLS_THREADING_C)
54 mbedtls_mutex_init( &cache->mutex );
55#endif
56}
57
58int mbedtls_ssl_cache_get( void *data, mbedtls_ssl_session *session )
59{
60 int ret = 1;
61#if defined(MBEDTLS_HAVE_TIME)
62 mbedtls_time_t t = mbedtls_time( NULL );
63#endif
64 mbedtls_ssl_cache_context *cache = (mbedtls_ssl_cache_context *) data;
65 mbedtls_ssl_cache_entry *cur, *entry;
66
67#if defined(MBEDTLS_THREADING_C)
68 if( mbedtls_mutex_lock( &cache->mutex ) != 0 )
69 return( 1 );
70#endif
71
72 cur = cache->chain;
73 entry = NULL;
74
75 while( cur != NULL )
76 {
77 entry = cur;
78 cur = cur->next;
79
80#if defined(MBEDTLS_HAVE_TIME)
81 if( cache->timeout != 0 &&
82 (int) ( t - entry->timestamp ) > cache->timeout )
83 continue;
84#endif
85
86 if( session->ciphersuite != entry->session.ciphersuite ||
87 session->compression != entry->session.compression ||
88 session->id_len != entry->session.id_len )
89 continue;
90
91 if( memcmp( session->id, entry->session.id,
92 entry->session.id_len ) != 0 )
93 continue;
94
95 memcpy( session->master, entry->session.master, 48 );
96
97 session->verify_result = entry->session.verify_result;
98
99#if defined(MBEDTLS_X509_CRT_PARSE_C)
100 /*
101 * Restore peer certificate (without rest of the original chain)
102 */
103 if( entry->peer_cert.p != NULL )
104 {
105 if( ( session->peer_cert = mbedtls_calloc( 1,
106 sizeof(mbedtls_x509_crt) ) ) == NULL )
107 {
108 ret = 1;
109 goto exit;
110 }
111
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 )
115 {
116 mbedtls_free( session->peer_cert );
117 session->peer_cert = NULL;
118 ret = 1;
119 goto exit;
120 }
121 }
122#endif /* MBEDTLS_X509_CRT_PARSE_C */
123
124 ret = 0;
125 goto exit;
126 }
127
128exit:
129#if defined(MBEDTLS_THREADING_C)
130 if( mbedtls_mutex_unlock( &cache->mutex ) != 0 )
131 ret = 1;
132#endif
133
134 return( ret );
135}
136
137int mbedtls_ssl_cache_set( void *data, const mbedtls_ssl_session *session )
138{
139 int ret = 1;
140#if defined(MBEDTLS_HAVE_TIME)
141 mbedtls_time_t t = mbedtls_time( NULL ), oldest = 0;
142 mbedtls_ssl_cache_entry *old = NULL;
143#endif
144 mbedtls_ssl_cache_context *cache = (mbedtls_ssl_cache_context *) data;
145 mbedtls_ssl_cache_entry *cur, *prv;
146 int count = 0;
147
148#if defined(MBEDTLS_THREADING_C)
149 if( ( ret = mbedtls_mutex_lock( &cache->mutex ) ) != 0 )
150 return( ret );
151#endif
152
153 cur = cache->chain;
154 prv = NULL;
155
156 while( cur != NULL )
157 {
158 count++;
159
160#if defined(MBEDTLS_HAVE_TIME)
161 if( cache->timeout != 0 &&
162 (int) ( t - cur->timestamp ) > cache->timeout )
163 {
164 cur->timestamp = t;
165 break; /* expired, reuse this slot, update timestamp */
166 }
167#endif
168
169 if( memcmp( session->id, cur->session.id, cur->session.id_len ) == 0 )
170 break; /* client reconnected, keep timestamp for session id */
171
172#if defined(MBEDTLS_HAVE_TIME)
173 if( oldest == 0 || cur->timestamp < oldest )
174 {
175 oldest = cur->timestamp;
176 old = cur;
177 }
178#endif
179
180 prv = cur;
181 cur = cur->next;
182 }
183
184 if( cur == NULL )
185 {
186#if defined(MBEDTLS_HAVE_TIME)
187 /*
188 * Reuse oldest entry if max_entries reached
189 */
190 if( count >= cache->max_entries )
191 {
192 if( old == NULL )
193 {
194 ret = 1;
195 goto exit;
196 }
197
198 cur = old;
199 }
200#else /* MBEDTLS_HAVE_TIME */
201 /*
202 * Reuse first entry in chain if max_entries reached,
203 * but move to last place
204 */
205 if( count >= cache->max_entries )
206 {
207 if( cache->chain == NULL )
208 {
209 ret = 1;
210 goto exit;
211 }
212
213 cur = cache->chain;
214 cache->chain = cur->next;
215 cur->next = NULL;
216 prv->next = cur;
217 }
218#endif /* MBEDTLS_HAVE_TIME */
219 else
220 {
221 /*
222 * max_entries not reached, create new entry
223 */
224 cur = mbedtls_calloc( 1, sizeof(mbedtls_ssl_cache_entry) );
225 if( cur == NULL )
226 {
227 ret = 1;
228 goto exit;
229 }
230
231 if( prv == NULL )
232 cache->chain = cur;
233 else
234 prv->next = cur;
235 }
236
237#if defined(MBEDTLS_HAVE_TIME)
238 cur->timestamp = t;
239#endif
240 }
241
242 memcpy( &cur->session, session, sizeof( mbedtls_ssl_session ) );
243
244#if defined(MBEDTLS_X509_CRT_PARSE_C)
245 /*
246 * If we're reusing an entry, free its certificate first
247 */
248 if( cur->peer_cert.p != NULL )
249 {
250 mbedtls_free( cur->peer_cert.p );
251 memset( &cur->peer_cert, 0, sizeof(mbedtls_x509_buf) );
252 }
253
254 /*
255 * Store peer certificate
256 */
257 if( session->peer_cert != NULL )
258 {
259 cur->peer_cert.p = mbedtls_calloc( 1, session->peer_cert->raw.len );
260 if( cur->peer_cert.p == NULL )
261 {
262 ret = 1;
263 goto exit;
264 }
265
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;
269
270 cur->session.peer_cert = NULL;
271 }
272#endif /* MBEDTLS_X509_CRT_PARSE_C */
273
274 ret = 0;
275
276exit:
277#if defined(MBEDTLS_THREADING_C)
278 if( mbedtls_mutex_unlock( &cache->mutex ) != 0 )
279 ret = 1;
280#endif
281
282 return( ret );
283}
284
285#if defined(MBEDTLS_HAVE_TIME)
286void mbedtls_ssl_cache_set_timeout( mbedtls_ssl_cache_context *cache, int timeout )
287{
288 if( timeout < 0 ) timeout = 0;
289
290 cache->timeout = timeout;
291}
292#endif /* MBEDTLS_HAVE_TIME */
293
294void mbedtls_ssl_cache_set_max_entries( mbedtls_ssl_cache_context *cache, int max )
295{
296 if( max < 0 ) max = 0;
297
298 cache->max_entries = max;
299}
300
301void mbedtls_ssl_cache_free( mbedtls_ssl_cache_context *cache )
302{
303 mbedtls_ssl_cache_entry *cur, *prv;
304
305 cur = cache->chain;
306
307 while( cur != NULL )
308 {
309 prv = cur;
310 cur = cur->next;
311
312 mbedtls_ssl_session_free( &prv->session );
313
314#if defined(MBEDTLS_X509_CRT_PARSE_C)
315 mbedtls_free( prv->peer_cert.p );
316#endif /* MBEDTLS_X509_CRT_PARSE_C */
317
318 mbedtls_free( prv );
319 }
320
321#if defined(MBEDTLS_THREADING_C)
322 mbedtls_mutex_free( &cache->mutex );
323#endif
324 cache->chain = NULL;
325}
326
327#endif /* MBEDTLS_SSL_CACHE_C */
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