335 lines
8.1 KiB
C
335 lines
8.1 KiB
C
/*
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* SSL session cache implementation
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*
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* Copyright (C) 2006-2014, Brainspark B.V.
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*
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* This file is part of PolarSSL (http://www.polarssl.org)
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* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/*
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* These session callbacks use a simple chained list
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* to store and retrieve the session information.
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*/
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#if !defined(POLARSSL_CONFIG_FILE)
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#include "polarssl/config.h"
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#else
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#include POLARSSL_CONFIG_FILE
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#endif
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#if defined(POLARSSL_SSL_CACHE_C)
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#include "polarssl/ssl_cache.h"
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#if defined(POLARSSL_PLATFORM_C)
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#include "polarssl/platform.h"
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#else
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#define polarssl_malloc malloc
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#define polarssl_free free
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#endif
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#include <stdlib.h>
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void ssl_cache_init( ssl_cache_context *cache )
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{
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memset( cache, 0, sizeof( ssl_cache_context ) );
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cache->timeout = SSL_CACHE_DEFAULT_TIMEOUT;
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cache->max_entries = SSL_CACHE_DEFAULT_MAX_ENTRIES;
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#if defined(POLARSSL_THREADING_C)
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polarssl_mutex_init( &cache->mutex );
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#endif
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}
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int ssl_cache_get( void *data, ssl_session *session )
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{
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int ret = 1;
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#if defined(POLARSSL_HAVE_TIME)
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time_t t = time( NULL );
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#endif
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ssl_cache_context *cache = (ssl_cache_context *) data;
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ssl_cache_entry *cur, *entry;
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#if defined(POLARSSL_THREADING_C)
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if( polarssl_mutex_lock( &cache->mutex ) != 0 )
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return( 1 );
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#endif
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cur = cache->chain;
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entry = NULL;
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while( cur != NULL )
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{
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entry = cur;
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cur = cur->next;
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#if defined(POLARSSL_HAVE_TIME)
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if( cache->timeout != 0 &&
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(int) ( t - entry->timestamp ) > cache->timeout )
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continue;
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#endif
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if( session->ciphersuite != entry->session.ciphersuite ||
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session->compression != entry->session.compression ||
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session->length != entry->session.length )
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continue;
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if( memcmp( session->id, entry->session.id,
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entry->session.length ) != 0 )
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continue;
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memcpy( session->master, entry->session.master, 48 );
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session->verify_result = entry->session.verify_result;
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#if defined(POLARSSL_X509_CRT_PARSE_C)
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/*
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* Restore peer certificate (without rest of the original chain)
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*/
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if( entry->peer_cert.p != NULL )
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{
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session->peer_cert =
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(x509_crt *) polarssl_malloc( sizeof(x509_crt) );
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if( session->peer_cert == NULL )
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{
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ret = 1;
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goto exit;
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}
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x509_crt_init( session->peer_cert );
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if( x509_crt_parse( session->peer_cert, entry->peer_cert.p,
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entry->peer_cert.len ) != 0 )
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{
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polarssl_free( session->peer_cert );
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session->peer_cert = NULL;
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ret = 1;
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goto exit;
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}
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}
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#endif /* POLARSSL_X509_CRT_PARSE_C */
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ret = 0;
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goto exit;
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}
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exit:
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#if defined(POLARSSL_THREADING_C)
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if( polarssl_mutex_unlock( &cache->mutex ) != 0 )
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ret = 1;
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#endif
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return( ret );
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}
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int ssl_cache_set( void *data, const ssl_session *session )
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{
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int ret = 1;
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#if defined(POLARSSL_HAVE_TIME)
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time_t t = time( NULL ), oldest = 0;
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ssl_cache_entry *old = NULL;
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#endif
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ssl_cache_context *cache = (ssl_cache_context *) data;
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ssl_cache_entry *cur, *prv;
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int count = 0;
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#if defined(POLARSSL_THREADING_C)
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if( ( ret = polarssl_mutex_lock( &cache->mutex ) ) != 0 )
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return( ret );
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#endif
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cur = cache->chain;
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prv = NULL;
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while( cur != NULL )
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{
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count++;
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#if defined(POLARSSL_HAVE_TIME)
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if( cache->timeout != 0 &&
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(int) ( t - cur->timestamp ) > cache->timeout )
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{
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cur->timestamp = t;
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break; /* expired, reuse this slot, update timestamp */
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}
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#endif
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if( memcmp( session->id, cur->session.id, cur->session.length ) == 0 )
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break; /* client reconnected, keep timestamp for session id */
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#if defined(POLARSSL_HAVE_TIME)
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if( oldest == 0 || cur->timestamp < oldest )
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{
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oldest = cur->timestamp;
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old = cur;
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}
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#endif
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prv = cur;
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cur = cur->next;
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}
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if( cur == NULL )
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{
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#if defined(POLARSSL_HAVE_TIME)
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/*
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* Reuse oldest entry if max_entries reached
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*/
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if( count >= cache->max_entries )
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{
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if( old == NULL )
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{
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ret = 1;
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goto exit;
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}
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cur = old;
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}
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#else /* POLARSSL_HAVE_TIME */
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/*
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* Reuse first entry in chain if max_entries reached,
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* but move to last place
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*/
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if( count >= cache->max_entries )
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{
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if( cache->chain == NULL )
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{
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ret = 1;
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goto exit;
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}
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cur = cache->chain;
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cache->chain = cur->next;
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cur->next = NULL;
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prv->next = cur;
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}
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#endif /* POLARSSL_HAVE_TIME */
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else
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{
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/*
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* max_entries not reached, create new entry
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*/
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cur = (ssl_cache_entry *)
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polarssl_malloc( sizeof(ssl_cache_entry) );
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if( cur == NULL )
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{
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ret = 1;
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goto exit;
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}
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memset( cur, 0, sizeof(ssl_cache_entry) );
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if( prv == NULL )
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cache->chain = cur;
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else
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prv->next = cur;
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}
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#if defined(POLARSSL_HAVE_TIME)
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cur->timestamp = t;
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#endif
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}
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memcpy( &cur->session, session, sizeof( ssl_session ) );
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#if defined(POLARSSL_X509_CRT_PARSE_C)
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/*
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* If we're reusing an entry, free its certificate first
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*/
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if( cur->peer_cert.p != NULL )
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{
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polarssl_free( cur->peer_cert.p );
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memset( &cur->peer_cert, 0, sizeof(x509_buf) );
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}
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/*
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* Store peer certificate
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*/
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if( session->peer_cert != NULL )
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{
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cur->peer_cert.p = (unsigned char *)
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polarssl_malloc( session->peer_cert->raw.len );
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if( cur->peer_cert.p == NULL )
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{
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ret = 1;
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goto exit;
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}
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memcpy( cur->peer_cert.p, session->peer_cert->raw.p,
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session->peer_cert->raw.len );
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cur->peer_cert.len = session->peer_cert->raw.len;
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cur->session.peer_cert = NULL;
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}
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#endif /* POLARSSL_X509_CRT_PARSE_C */
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ret = 0;
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exit:
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#if defined(POLARSSL_THREADING_C)
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if( polarssl_mutex_unlock( &cache->mutex ) != 0 )
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ret = 1;
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#endif
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return( ret );
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}
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#if defined(POLARSSL_HAVE_TIME)
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void ssl_cache_set_timeout( ssl_cache_context *cache, int timeout )
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{
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if( timeout < 0 ) timeout = 0;
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cache->timeout = timeout;
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}
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#endif /* POLARSSL_HAVE_TIME */
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void ssl_cache_set_max_entries( ssl_cache_context *cache, int max )
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{
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if( max < 0 ) max = 0;
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cache->max_entries = max;
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}
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void ssl_cache_free( ssl_cache_context *cache )
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{
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ssl_cache_entry *cur, *prv;
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cur = cache->chain;
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while( cur != NULL )
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{
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prv = cur;
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cur = cur->next;
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ssl_session_free( &prv->session );
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#if defined(POLARSSL_X509_CRT_PARSE_C)
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polarssl_free( prv->peer_cert.p );
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#endif /* POLARSSL_X509_CRT_PARSE_C */
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polarssl_free( prv );
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}
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#if defined(POLARSSL_THREADING_C)
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polarssl_mutex_free( &cache->mutex );
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#endif
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}
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#endif /* POLARSSL_SSL_CACHE_C */
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