reactos/dll/3rdparty/mbedtls/ssl_cache.c

   1 /*
   2  *  SSL session cache implementation
   3  *
   4  *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
   5  *  SPDX-License-Identifier: GPL-2.0
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 2 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License along
  18  *  with this program; if not, write to the Free Software Foundation, Inc.,
  19  *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  *  This file is part of mbed TLS (https://tls.mbed.org)
  22  */
  23 /*
  24  * These session callbacks use a simple chained list
  25  * to store and retrieve the session information.
  26  */
  27
  28 #if !defined(MBEDTLS_CONFIG_FILE)
  29 #include "mbedtls/config.h"
  30 #else
  31 #include MBEDTLS_CONFIG_FILE
  32 #endif
  33
  34 #if defined(MBEDTLS_SSL_CACHE_C)
  35
  36 #if defined(MBEDTLS_PLATFORM_C)
  37 #include "mbedtls/platform.h"
  38 #else
  39 #include <stdlib.h>
  40 #define mbedtls_calloc    calloc
  41 #define mbedtls_free      free
  42 #endif
  43
  44 #include "mbedtls/ssl_cache.h"
  45
  46 #include <string.h>
  47
  48 void mbedtls_ssl_cache_init( mbedtls_ssl_cache_context *cache )
  49 {
  50     memset( cache, 0, sizeof( mbedtls_ssl_cache_context ) );
  51
  52     cache->timeout = MBEDTLS_SSL_CACHE_DEFAULT_TIMEOUT;
  53     cache->max_entries = MBEDTLS_SSL_CACHE_DEFAULT_MAX_ENTRIES;
  54
  55 #if defined(MBEDTLS_THREADING_C)
  56     mbedtls_mutex_init( &cache->mutex );
  57 #endif
  58 }
  59
  60 int mbedtls_ssl_cache_get( void *data, mbedtls_ssl_session *session )
  61 {
  62     int ret = 1;
  63 #if defined(MBEDTLS_HAVE_TIME)
  64     mbedtls_time_t t = mbedtls_time( NULL );
  65 #endif
  66     mbedtls_ssl_cache_context *cache = (mbedtls_ssl_cache_context *) data;
  67     mbedtls_ssl_cache_entry *cur, *entry;
  68
  69 #if defined(MBEDTLS_THREADING_C)
  70     if( mbedtls_mutex_lock( &cache->mutex ) != 0 )
  71         return( 1 );
  72 #endif
  73
  74     cur = cache->chain;
  75     entry = NULL;
  76
  77     while( cur != NULL )
  78     {
  79         entry = cur;
  80         cur = cur->next;
  81
  82 #if defined(MBEDTLS_HAVE_TIME)
  83         if( cache->timeout != 0 &&
  84             (int) ( t - entry->timestamp ) > cache->timeout )
  85             continue;
  86 #endif
  87
  88         if( session->ciphersuite != entry->session.ciphersuite ||
  89             session->compression != entry->session.compression ||
  90             session->id_len != entry->session.id_len )
  91             continue;
  92
  93         if( memcmp( session->id, entry->session.id,
  94                     entry->session.id_len ) != 0 )
  95             continue;
  96
  97         memcpy( session->master, entry->session.master, 48 );
  98
  99         session->verify_result = entry->session.verify_result;
 100
 101 #if defined(MBEDTLS_X509_CRT_PARSE_C)
 102         /*
 103          * Restore peer certificate (without rest of the original chain)
 104          */
 105         if( entry->peer_cert.p != NULL )
 106         {
 107             if( ( session->peer_cert = mbedtls_calloc( 1,
 108                                  sizeof(mbedtls_x509_crt) ) ) == NULL )
 109             {
 110                 ret = 1;
 111                 goto exit;
 112             }
 113
 114             mbedtls_x509_crt_init( session->peer_cert );
 115             if( mbedtls_x509_crt_parse( session->peer_cert, entry->peer_cert.p,
 116                                 entry->peer_cert.len ) != 0 )
 117             {
 118                 mbedtls_free( session->peer_cert );
 119                 session->peer_cert = NULL;
 120                 ret = 1;
 121                 goto exit;
 122             }
 123         }
 124 #endif /* MBEDTLS_X509_CRT_PARSE_C */
 125
 126         ret = 0;
 127         goto exit;
 128     }
 129
 130 exit:
 131 #if defined(MBEDTLS_THREADING_C)
 132     if( mbedtls_mutex_unlock( &cache->mutex ) != 0 )
 133         ret = 1;
 134 #endif
 135
 136     return( ret );
 137 }
 138
 139 int mbedtls_ssl_cache_set( void *data, const mbedtls_ssl_session *session )
 140 {
 141     int ret = 1;
 142 #if defined(MBEDTLS_HAVE_TIME)
 143     mbedtls_time_t t = time( NULL ), oldest = 0;
 144     mbedtls_ssl_cache_entry *old = NULL;
 145 #endif
 146     mbedtls_ssl_cache_context *cache = (mbedtls_ssl_cache_context *) data;
 147     mbedtls_ssl_cache_entry *cur, *prv;
 148     int count = 0;
 149
 150 #if defined(MBEDTLS_THREADING_C)
 151     if( ( ret = mbedtls_mutex_lock( &cache->mutex ) ) != 0 )
 152         return( ret );
 153 #endif
 154
 155     cur = cache->chain;
 156     prv = NULL;
 157
 158     while( cur != NULL )
 159     {
 160         count++;
 161
 162 #if defined(MBEDTLS_HAVE_TIME)
 163         if( cache->timeout != 0 &&
 164             (int) ( t - cur->timestamp ) > cache->timeout )
 165         {
 166             cur->timestamp = t;
 167             break; /* expired, reuse this slot, update timestamp */
 168         }
 169 #endif
 170
 171         if( memcmp( session->id, cur->session.id, cur->session.id_len ) == 0 )
 172             break; /* client reconnected, keep timestamp for session id */
 173
 174 #if defined(MBEDTLS_HAVE_TIME)
 175         if( oldest == 0 || cur->timestamp < oldest )
 176         {
 177             oldest = cur->timestamp;
 178             old = cur;
 179         }
 180 #endif
 181
 182         prv = cur;
 183         cur = cur->next;
 184     }
 185
 186     if( cur == NULL )
 187     {
 188 #if defined(MBEDTLS_HAVE_TIME)
 189         /*
 190          * Reuse oldest entry if max_entries reached
 191          */
 192         if( count >= cache->max_entries )
 193         {
 194             if( old == NULL )
 195             {
 196                 ret = 1;
 197                 goto exit;
 198             }
 199
 200             cur = old;
 201         }
 202 #else /* MBEDTLS_HAVE_TIME */
 203         /*
 204          * Reuse first entry in chain if max_entries reached,
 205          * but move to last place
 206          */
 207         if( count >= cache->max_entries )
 208         {
 209             if( cache->chain == NULL )
 210             {
 211                 ret = 1;
 212                 goto exit;
 213             }
 214
 215             cur = cache->chain;
 216             cache->chain = cur->next;
 217             cur->next = NULL;
 218             prv->next = cur;
 219         }
 220 #endif /* MBEDTLS_HAVE_TIME */
 221         else
 222         {
 223             /*
 224              * max_entries not reached, create new entry
 225              */
 226             cur = mbedtls_calloc( 1, sizeof(mbedtls_ssl_cache_entry) );
 227             if( cur == NULL )
 228             {
 229                 ret = 1;
 230                 goto exit;
 231             }
 232
 233             if( prv == NULL )
 234                 cache->chain = cur;
 235             else
 236                 prv->next = cur;
 237         }
 238
 239 #if defined(MBEDTLS_HAVE_TIME)
 240         cur->timestamp = t;
 241 #endif
 242     }
 243
 244     memcpy( &cur->session, session, sizeof( mbedtls_ssl_session ) );
 245
 246 #if defined(MBEDTLS_X509_CRT_PARSE_C)
 247     /*
 248      * If we're reusing an entry, free its certificate first
 249      */
 250     if( cur->peer_cert.p != NULL )
 251     {
 252         mbedtls_free( cur->peer_cert.p );
 253         memset( &cur->peer_cert, 0, sizeof(mbedtls_x509_buf) );
 254     }
 255
 256     /*
 257      * Store peer certificate
 258      */
 259     if( session->peer_cert != NULL )
 260     {
 261         cur->peer_cert.p = mbedtls_calloc( 1, session->peer_cert->raw.len );
 262         if( cur->peer_cert.p == NULL )
 263         {
 264             ret = 1;
 265             goto exit;
 266         }
 267
 268         memcpy( cur->peer_cert.p, session->peer_cert->raw.p,
 269                 session->peer_cert->raw.len );
 270         cur->peer_cert.len = session->peer_cert->raw.len;
 271
 272         cur->session.peer_cert = NULL;
 273     }
 274 #endif /* MBEDTLS_X509_CRT_PARSE_C */
 275
 276     ret = 0;
 277
 278 exit:
 279 #if defined(MBEDTLS_THREADING_C)
 280     if( mbedtls_mutex_unlock( &cache->mutex ) != 0 )
 281         ret = 1;
 282 #endif
 283
 284     return( ret );
 285 }
 286
 287 #if defined(MBEDTLS_HAVE_TIME)
 288 void mbedtls_ssl_cache_set_timeout( mbedtls_ssl_cache_context *cache, int timeout )
 289 {
 290     if( timeout < 0 ) timeout = 0;
 291
 292     cache->timeout = timeout;
 293 }
 294 #endif /* MBEDTLS_HAVE_TIME */
 295
 296 void mbedtls_ssl_cache_set_max_entries( mbedtls_ssl_cache_context *cache, int max )
 297 {
 298     if( max < 0 ) max = 0;
 299
 300     cache->max_entries = max;
 301 }
 302
 303 void mbedtls_ssl_cache_free( mbedtls_ssl_cache_context *cache )
 304 {
 305     mbedtls_ssl_cache_entry *cur, *prv;
 306
 307     cur = cache->chain;
 308
 309     while( cur != NULL )
 310     {
 311         prv = cur;
 312         cur = cur->next;
 313
 314         mbedtls_ssl_session_free( &prv->session );
 315
 316 #if defined(MBEDTLS_X509_CRT_PARSE_C)
 317         mbedtls_free( prv->peer_cert.p );
 318 #endif /* MBEDTLS_X509_CRT_PARSE_C */
 319
 320         mbedtls_free( prv );
 321     }
 322
 323 #if defined(MBEDTLS_THREADING_C)
 324     mbedtls_mutex_free( &cache->mutex );
 325 #endif
 326 }
 327
 328 #endif /* MBEDTLS_SSL_CACHE_C */