EL4121 Embedded System / mbed-os

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features/mbedtls/src/ssl_cache.c@0:b74591d5ab33, 2017-12-11 (annotated)

Committer:
be_bryan
Date:
Mon Dec 11 17:54:04 2017 +0000
Revision:
0:b74591d5ab33
motor ++

Who changed what in which revision?

UserRevisionLine numberNew contents of line
be_bryan 0:b74591d5ab33 1 /*
be_bryan 0:b74591d5ab33 2 * SSL session cache implementation
be_bryan 0:b74591d5ab33 3 *
be_bryan 0:b74591d5ab33 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
be_bryan 0:b74591d5ab33 5 * SPDX-License-Identifier: Apache-2.0
be_bryan 0:b74591d5ab33 6 *
be_bryan 0:b74591d5ab33 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
be_bryan 0:b74591d5ab33 8 * not use this file except in compliance with the License.
be_bryan 0:b74591d5ab33 9 * You may obtain a copy of the License at
be_bryan 0:b74591d5ab33 10 *
be_bryan 0:b74591d5ab33 11 * http://www.apache.org/licenses/LICENSE-2.0
be_bryan 0:b74591d5ab33 12 *
be_bryan 0:b74591d5ab33 13 * Unless required by applicable law or agreed to in writing, software
be_bryan 0:b74591d5ab33 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
be_bryan 0:b74591d5ab33 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
be_bryan 0:b74591d5ab33 16 * See the License for the specific language governing permissions and
be_bryan 0:b74591d5ab33 17 * limitations under the License.
be_bryan 0:b74591d5ab33 18 *
be_bryan 0:b74591d5ab33 19 * This file is part of mbed TLS (https://tls.mbed.org)
be_bryan 0:b74591d5ab33 20 */
be_bryan 0:b74591d5ab33 21 /*
be_bryan 0:b74591d5ab33 22 * These session callbacks use a simple chained list
be_bryan 0:b74591d5ab33 23 * to store and retrieve the session information.
be_bryan 0:b74591d5ab33 24 */
be_bryan 0:b74591d5ab33 25
be_bryan 0:b74591d5ab33 26 #if !defined(MBEDTLS_CONFIG_FILE)
be_bryan 0:b74591d5ab33 27 #include "mbedtls/config.h"
be_bryan 0:b74591d5ab33 28 #else
be_bryan 0:b74591d5ab33 29 #include MBEDTLS_CONFIG_FILE
be_bryan 0:b74591d5ab33 30 #endif
be_bryan 0:b74591d5ab33 31
be_bryan 0:b74591d5ab33 32 #if defined(MBEDTLS_SSL_CACHE_C)
be_bryan 0:b74591d5ab33 33
be_bryan 0:b74591d5ab33 34 #if defined(MBEDTLS_PLATFORM_C)
be_bryan 0:b74591d5ab33 35 #include "mbedtls/platform.h"
be_bryan 0:b74591d5ab33 36 #else
be_bryan 0:b74591d5ab33 37 #include <stdlib.h>
be_bryan 0:b74591d5ab33 38 #define mbedtls_calloc calloc
be_bryan 0:b74591d5ab33 39 #define mbedtls_free free
be_bryan 0:b74591d5ab33 40 #endif
be_bryan 0:b74591d5ab33 41
be_bryan 0:b74591d5ab33 42 #include "mbedtls/ssl_cache.h"
be_bryan 0:b74591d5ab33 43
be_bryan 0:b74591d5ab33 44 #include <string.h>
be_bryan 0:b74591d5ab33 45
be_bryan 0:b74591d5ab33 46 void mbedtls_ssl_cache_init( mbedtls_ssl_cache_context *cache )
be_bryan 0:b74591d5ab33 47 {
be_bryan 0:b74591d5ab33 48 memset( cache, 0, sizeof( mbedtls_ssl_cache_context ) );
be_bryan 0:b74591d5ab33 49
be_bryan 0:b74591d5ab33 50 cache->timeout = MBEDTLS_SSL_CACHE_DEFAULT_TIMEOUT;
be_bryan 0:b74591d5ab33 51 cache->max_entries = MBEDTLS_SSL_CACHE_DEFAULT_MAX_ENTRIES;
be_bryan 0:b74591d5ab33 52
be_bryan 0:b74591d5ab33 53 #if defined(MBEDTLS_THREADING_C)
be_bryan 0:b74591d5ab33 54 mbedtls_mutex_init( &cache->mutex );
be_bryan 0:b74591d5ab33 55 #endif
be_bryan 0:b74591d5ab33 56 }
be_bryan 0:b74591d5ab33 57
be_bryan 0:b74591d5ab33 58 int mbedtls_ssl_cache_get( void *data, mbedtls_ssl_session *session )
be_bryan 0:b74591d5ab33 59 {
be_bryan 0:b74591d5ab33 60 int ret = 1;
be_bryan 0:b74591d5ab33 61 #if defined(MBEDTLS_HAVE_TIME)
be_bryan 0:b74591d5ab33 62 mbedtls_time_t t = mbedtls_time( NULL );
be_bryan 0:b74591d5ab33 63 #endif
be_bryan 0:b74591d5ab33 64 mbedtls_ssl_cache_context *cache = (mbedtls_ssl_cache_context *) data;
be_bryan 0:b74591d5ab33 65 mbedtls_ssl_cache_entry *cur, *entry;
be_bryan 0:b74591d5ab33 66
be_bryan 0:b74591d5ab33 67 #if defined(MBEDTLS_THREADING_C)
be_bryan 0:b74591d5ab33 68 if( mbedtls_mutex_lock( &cache->mutex ) != 0 )
be_bryan 0:b74591d5ab33 69 return( 1 );
be_bryan 0:b74591d5ab33 70 #endif
be_bryan 0:b74591d5ab33 71
be_bryan 0:b74591d5ab33 72 cur = cache->chain;
be_bryan 0:b74591d5ab33 73 entry = NULL;
be_bryan 0:b74591d5ab33 74
be_bryan 0:b74591d5ab33 75 while( cur != NULL )
be_bryan 0:b74591d5ab33 76 {
be_bryan 0:b74591d5ab33 77 entry = cur;
be_bryan 0:b74591d5ab33 78 cur = cur->next;
be_bryan 0:b74591d5ab33 79
be_bryan 0:b74591d5ab33 80 #if defined(MBEDTLS_HAVE_TIME)
be_bryan 0:b74591d5ab33 81 if( cache->timeout != 0 &&
be_bryan 0:b74591d5ab33 82 (int) ( t - entry->timestamp ) > cache->timeout )
be_bryan 0:b74591d5ab33 83 continue;
be_bryan 0:b74591d5ab33 84 #endif
be_bryan 0:b74591d5ab33 85
be_bryan 0:b74591d5ab33 86 if( session->ciphersuite != entry->session.ciphersuite ||
be_bryan 0:b74591d5ab33 87 session->compression != entry->session.compression ||
be_bryan 0:b74591d5ab33 88 session->id_len != entry->session.id_len )
be_bryan 0:b74591d5ab33 89 continue;
be_bryan 0:b74591d5ab33 90
be_bryan 0:b74591d5ab33 91 if( memcmp( session->id, entry->session.id,
be_bryan 0:b74591d5ab33 92 entry->session.id_len ) != 0 )
be_bryan 0:b74591d5ab33 93 continue;
be_bryan 0:b74591d5ab33 94
be_bryan 0:b74591d5ab33 95 memcpy( session->master, entry->session.master, 48 );
be_bryan 0:b74591d5ab33 96
be_bryan 0:b74591d5ab33 97 session->verify_result = entry->session.verify_result;
be_bryan 0:b74591d5ab33 98
be_bryan 0:b74591d5ab33 99 #if defined(MBEDTLS_X509_CRT_PARSE_C)
be_bryan 0:b74591d5ab33 100 /*
be_bryan 0:b74591d5ab33 101 * Restore peer certificate (without rest of the original chain)
be_bryan 0:b74591d5ab33 102 */
be_bryan 0:b74591d5ab33 103 if( entry->peer_cert.p != NULL )
be_bryan 0:b74591d5ab33 104 {
be_bryan 0:b74591d5ab33 105 if( ( session->peer_cert = mbedtls_calloc( 1,
be_bryan 0:b74591d5ab33 106 sizeof(mbedtls_x509_crt) ) ) == NULL )
be_bryan 0:b74591d5ab33 107 {
be_bryan 0:b74591d5ab33 108 ret = 1;
be_bryan 0:b74591d5ab33 109 goto exit;
be_bryan 0:b74591d5ab33 110 }
be_bryan 0:b74591d5ab33 111
be_bryan 0:b74591d5ab33 112 mbedtls_x509_crt_init( session->peer_cert );
be_bryan 0:b74591d5ab33 113 if( mbedtls_x509_crt_parse( session->peer_cert, entry->peer_cert.p,
be_bryan 0:b74591d5ab33 114 entry->peer_cert.len ) != 0 )
be_bryan 0:b74591d5ab33 115 {
be_bryan 0:b74591d5ab33 116 mbedtls_free( session->peer_cert );
be_bryan 0:b74591d5ab33 117 session->peer_cert = NULL;
be_bryan 0:b74591d5ab33 118 ret = 1;
be_bryan 0:b74591d5ab33 119 goto exit;
be_bryan 0:b74591d5ab33 120 }
be_bryan 0:b74591d5ab33 121 }
be_bryan 0:b74591d5ab33 122 #endif /* MBEDTLS_X509_CRT_PARSE_C */
be_bryan 0:b74591d5ab33 123
be_bryan 0:b74591d5ab33 124 ret = 0;
be_bryan 0:b74591d5ab33 125 goto exit;
be_bryan 0:b74591d5ab33 126 }
be_bryan 0:b74591d5ab33 127
be_bryan 0:b74591d5ab33 128 exit:
be_bryan 0:b74591d5ab33 129 #if defined(MBEDTLS_THREADING_C)
be_bryan 0:b74591d5ab33 130 if( mbedtls_mutex_unlock( &cache->mutex ) != 0 )
be_bryan 0:b74591d5ab33 131 ret = 1;
be_bryan 0:b74591d5ab33 132 #endif
be_bryan 0:b74591d5ab33 133
be_bryan 0:b74591d5ab33 134 return( ret );
be_bryan 0:b74591d5ab33 135 }
be_bryan 0:b74591d5ab33 136
be_bryan 0:b74591d5ab33 137 int mbedtls_ssl_cache_set( void *data, const mbedtls_ssl_session *session )
be_bryan 0:b74591d5ab33 138 {
be_bryan 0:b74591d5ab33 139 int ret = 1;
be_bryan 0:b74591d5ab33 140 #if defined(MBEDTLS_HAVE_TIME)
be_bryan 0:b74591d5ab33 141 mbedtls_time_t t = mbedtls_time( NULL ), oldest = 0;
be_bryan 0:b74591d5ab33 142 mbedtls_ssl_cache_entry *old = NULL;
be_bryan 0:b74591d5ab33 143 #endif
be_bryan 0:b74591d5ab33 144 mbedtls_ssl_cache_context *cache = (mbedtls_ssl_cache_context *) data;
be_bryan 0:b74591d5ab33 145 mbedtls_ssl_cache_entry *cur, *prv;
be_bryan 0:b74591d5ab33 146 int count = 0;
be_bryan 0:b74591d5ab33 147
be_bryan 0:b74591d5ab33 148 #if defined(MBEDTLS_THREADING_C)
be_bryan 0:b74591d5ab33 149 if( ( ret = mbedtls_mutex_lock( &cache->mutex ) ) != 0 )
be_bryan 0:b74591d5ab33 150 return( ret );
be_bryan 0:b74591d5ab33 151 #endif
be_bryan 0:b74591d5ab33 152
be_bryan 0:b74591d5ab33 153 cur = cache->chain;
be_bryan 0:b74591d5ab33 154 prv = NULL;
be_bryan 0:b74591d5ab33 155
be_bryan 0:b74591d5ab33 156 while( cur != NULL )
be_bryan 0:b74591d5ab33 157 {
be_bryan 0:b74591d5ab33 158 count++;
be_bryan 0:b74591d5ab33 159
be_bryan 0:b74591d5ab33 160 #if defined(MBEDTLS_HAVE_TIME)
be_bryan 0:b74591d5ab33 161 if( cache->timeout != 0 &&
be_bryan 0:b74591d5ab33 162 (int) ( t - cur->timestamp ) > cache->timeout )
be_bryan 0:b74591d5ab33 163 {
be_bryan 0:b74591d5ab33 164 cur->timestamp = t;
be_bryan 0:b74591d5ab33 165 break; /* expired, reuse this slot, update timestamp */
be_bryan 0:b74591d5ab33 166 }
be_bryan 0:b74591d5ab33 167 #endif
be_bryan 0:b74591d5ab33 168
be_bryan 0:b74591d5ab33 169 if( memcmp( session->id, cur->session.id, cur->session.id_len ) == 0 )
be_bryan 0:b74591d5ab33 170 break; /* client reconnected, keep timestamp for session id */
be_bryan 0:b74591d5ab33 171
be_bryan 0:b74591d5ab33 172 #if defined(MBEDTLS_HAVE_TIME)
be_bryan 0:b74591d5ab33 173 if( oldest == 0 || cur->timestamp < oldest )
be_bryan 0:b74591d5ab33 174 {
be_bryan 0:b74591d5ab33 175 oldest = cur->timestamp;
be_bryan 0:b74591d5ab33 176 old = cur;
be_bryan 0:b74591d5ab33 177 }
be_bryan 0:b74591d5ab33 178 #endif
be_bryan 0:b74591d5ab33 179
be_bryan 0:b74591d5ab33 180 prv = cur;
be_bryan 0:b74591d5ab33 181 cur = cur->next;
be_bryan 0:b74591d5ab33 182 }
be_bryan 0:b74591d5ab33 183
be_bryan 0:b74591d5ab33 184 if( cur == NULL )
be_bryan 0:b74591d5ab33 185 {
be_bryan 0:b74591d5ab33 186 #if defined(MBEDTLS_HAVE_TIME)
be_bryan 0:b74591d5ab33 187 /*
be_bryan 0:b74591d5ab33 188 * Reuse oldest entry if max_entries reached
be_bryan 0:b74591d5ab33 189 */
be_bryan 0:b74591d5ab33 190 if( count >= cache->max_entries )
be_bryan 0:b74591d5ab33 191 {
be_bryan 0:b74591d5ab33 192 if( old == NULL )
be_bryan 0:b74591d5ab33 193 {
be_bryan 0:b74591d5ab33 194 ret = 1;
be_bryan 0:b74591d5ab33 195 goto exit;
be_bryan 0:b74591d5ab33 196 }
be_bryan 0:b74591d5ab33 197
be_bryan 0:b74591d5ab33 198 cur = old;
be_bryan 0:b74591d5ab33 199 }
be_bryan 0:b74591d5ab33 200 #else /* MBEDTLS_HAVE_TIME */
be_bryan 0:b74591d5ab33 201 /*
be_bryan 0:b74591d5ab33 202 * Reuse first entry in chain if max_entries reached,
be_bryan 0:b74591d5ab33 203 * but move to last place
be_bryan 0:b74591d5ab33 204 */
be_bryan 0:b74591d5ab33 205 if( count >= cache->max_entries )
be_bryan 0:b74591d5ab33 206 {
be_bryan 0:b74591d5ab33 207 if( cache->chain == NULL )
be_bryan 0:b74591d5ab33 208 {
be_bryan 0:b74591d5ab33 209 ret = 1;
be_bryan 0:b74591d5ab33 210 goto exit;
be_bryan 0:b74591d5ab33 211 }
be_bryan 0:b74591d5ab33 212
be_bryan 0:b74591d5ab33 213 cur = cache->chain;
be_bryan 0:b74591d5ab33 214 cache->chain = cur->next;
be_bryan 0:b74591d5ab33 215 cur->next = NULL;
be_bryan 0:b74591d5ab33 216 prv->next = cur;
be_bryan 0:b74591d5ab33 217 }
be_bryan 0:b74591d5ab33 218 #endif /* MBEDTLS_HAVE_TIME */
be_bryan 0:b74591d5ab33 219 else
be_bryan 0:b74591d5ab33 220 {
be_bryan 0:b74591d5ab33 221 /*
be_bryan 0:b74591d5ab33 222 * max_entries not reached, create new entry
be_bryan 0:b74591d5ab33 223 */
be_bryan 0:b74591d5ab33 224 cur = mbedtls_calloc( 1, sizeof(mbedtls_ssl_cache_entry) );
be_bryan 0:b74591d5ab33 225 if( cur == NULL )
be_bryan 0:b74591d5ab33 226 {
be_bryan 0:b74591d5ab33 227 ret = 1;
be_bryan 0:b74591d5ab33 228 goto exit;
be_bryan 0:b74591d5ab33 229 }
be_bryan 0:b74591d5ab33 230
be_bryan 0:b74591d5ab33 231 if( prv == NULL )
be_bryan 0:b74591d5ab33 232 cache->chain = cur;
be_bryan 0:b74591d5ab33 233 else
be_bryan 0:b74591d5ab33 234 prv->next = cur;
be_bryan 0:b74591d5ab33 235 }
be_bryan 0:b74591d5ab33 236
be_bryan 0:b74591d5ab33 237 #if defined(MBEDTLS_HAVE_TIME)
be_bryan 0:b74591d5ab33 238 cur->timestamp = t;
be_bryan 0:b74591d5ab33 239 #endif
be_bryan 0:b74591d5ab33 240 }
be_bryan 0:b74591d5ab33 241
be_bryan 0:b74591d5ab33 242 memcpy( &cur->session, session, sizeof( mbedtls_ssl_session ) );
be_bryan 0:b74591d5ab33 243
be_bryan 0:b74591d5ab33 244 #if defined(MBEDTLS_X509_CRT_PARSE_C)
be_bryan 0:b74591d5ab33 245 /*
be_bryan 0:b74591d5ab33 246 * If we're reusing an entry, free its certificate first
be_bryan 0:b74591d5ab33 247 */
be_bryan 0:b74591d5ab33 248 if( cur->peer_cert.p != NULL )
be_bryan 0:b74591d5ab33 249 {
be_bryan 0:b74591d5ab33 250 mbedtls_free( cur->peer_cert.p );
be_bryan 0:b74591d5ab33 251 memset( &cur->peer_cert, 0, sizeof(mbedtls_x509_buf) );
be_bryan 0:b74591d5ab33 252 }
be_bryan 0:b74591d5ab33 253
be_bryan 0:b74591d5ab33 254 /*
be_bryan 0:b74591d5ab33 255 * Store peer certificate
be_bryan 0:b74591d5ab33 256 */
be_bryan 0:b74591d5ab33 257 if( session->peer_cert != NULL )
be_bryan 0:b74591d5ab33 258 {
be_bryan 0:b74591d5ab33 259 cur->peer_cert.p = mbedtls_calloc( 1, session->peer_cert->raw.len );
be_bryan 0:b74591d5ab33 260 if( cur->peer_cert.p == NULL )
be_bryan 0:b74591d5ab33 261 {
be_bryan 0:b74591d5ab33 262 ret = 1;
be_bryan 0:b74591d5ab33 263 goto exit;
be_bryan 0:b74591d5ab33 264 }
be_bryan 0:b74591d5ab33 265
be_bryan 0:b74591d5ab33 266 memcpy( cur->peer_cert.p, session->peer_cert->raw.p,
be_bryan 0:b74591d5ab33 267 session->peer_cert->raw.len );
be_bryan 0:b74591d5ab33 268 cur->peer_cert.len = session->peer_cert->raw.len;
be_bryan 0:b74591d5ab33 269
be_bryan 0:b74591d5ab33 270 cur->session.peer_cert = NULL;
be_bryan 0:b74591d5ab33 271 }
be_bryan 0:b74591d5ab33 272 #endif /* MBEDTLS_X509_CRT_PARSE_C */
be_bryan 0:b74591d5ab33 273
be_bryan 0:b74591d5ab33 274 ret = 0;
be_bryan 0:b74591d5ab33 275
be_bryan 0:b74591d5ab33 276 exit:
be_bryan 0:b74591d5ab33 277 #if defined(MBEDTLS_THREADING_C)
be_bryan 0:b74591d5ab33 278 if( mbedtls_mutex_unlock( &cache->mutex ) != 0 )
be_bryan 0:b74591d5ab33 279 ret = 1;
be_bryan 0:b74591d5ab33 280 #endif
be_bryan 0:b74591d5ab33 281
be_bryan 0:b74591d5ab33 282 return( ret );
be_bryan 0:b74591d5ab33 283 }
be_bryan 0:b74591d5ab33 284
be_bryan 0:b74591d5ab33 285 #if defined(MBEDTLS_HAVE_TIME)
be_bryan 0:b74591d5ab33 286 void mbedtls_ssl_cache_set_timeout( mbedtls_ssl_cache_context *cache, int timeout )
be_bryan 0:b74591d5ab33 287 {
be_bryan 0:b74591d5ab33 288 if( timeout < 0 ) timeout = 0;
be_bryan 0:b74591d5ab33 289
be_bryan 0:b74591d5ab33 290 cache->timeout = timeout;
be_bryan 0:b74591d5ab33 291 }
be_bryan 0:b74591d5ab33 292 #endif /* MBEDTLS_HAVE_TIME */
be_bryan 0:b74591d5ab33 293
be_bryan 0:b74591d5ab33 294 void mbedtls_ssl_cache_set_max_entries( mbedtls_ssl_cache_context *cache, int max )
be_bryan 0:b74591d5ab33 295 {
be_bryan 0:b74591d5ab33 296 if( max < 0 ) max = 0;
be_bryan 0:b74591d5ab33 297
be_bryan 0:b74591d5ab33 298 cache->max_entries = max;
be_bryan 0:b74591d5ab33 299 }
be_bryan 0:b74591d5ab33 300
be_bryan 0:b74591d5ab33 301 void mbedtls_ssl_cache_free( mbedtls_ssl_cache_context *cache )
be_bryan 0:b74591d5ab33 302 {
be_bryan 0:b74591d5ab33 303 mbedtls_ssl_cache_entry *cur, *prv;
be_bryan 0:b74591d5ab33 304
be_bryan 0:b74591d5ab33 305 cur = cache->chain;
be_bryan 0:b74591d5ab33 306
be_bryan 0:b74591d5ab33 307 while( cur != NULL )
be_bryan 0:b74591d5ab33 308 {
be_bryan 0:b74591d5ab33 309 prv = cur;
be_bryan 0:b74591d5ab33 310 cur = cur->next;
be_bryan 0:b74591d5ab33 311
be_bryan 0:b74591d5ab33 312 mbedtls_ssl_session_free( &prv->session );
be_bryan 0:b74591d5ab33 313
be_bryan 0:b74591d5ab33 314 #if defined(MBEDTLS_X509_CRT_PARSE_C)
be_bryan 0:b74591d5ab33 315 mbedtls_free( prv->peer_cert.p );
be_bryan 0:b74591d5ab33 316 #endif /* MBEDTLS_X509_CRT_PARSE_C */
be_bryan 0:b74591d5ab33 317
be_bryan 0:b74591d5ab33 318 mbedtls_free( prv );
be_bryan 0:b74591d5ab33 319 }
be_bryan 0:b74591d5ab33 320
be_bryan 0:b74591d5ab33 321 #if defined(MBEDTLS_THREADING_C)
be_bryan 0:b74591d5ab33 322 mbedtls_mutex_free( &cache->mutex );
be_bryan 0:b74591d5ab33 323 #endif
be_bryan 0:b74591d5ab33 324 }
be_bryan 0:b74591d5ab33 325
be_bryan 0:b74591d5ab33 326 #endif /* MBEDTLS_SSL_CACHE_C */