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/*
* SSL session cache implementation
*
* Copyright (C) 2006-2012, Brainspark B.V.
*
* This file is part of PolarSSL (http://www.polarssl.org)
* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
*
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/*
* These session callbacks use a simple chained list
* to store and retrieve the session information.
*/
#include "polarssl/config.h"
#if defined(POLARSSL_SSL_CACHE_C)
#include "polarssl/ssl_cache.h"
#if defined(POLARSSL_MEMORY_C)
#include "polarssl/memory.h"
#else
#define polarssl_malloc malloc
#define polarssl_free free
#endif
#include <stdlib.h>
void ssl_cache_init( ssl_cache_context *cache )
{
memset( cache, 0, sizeof( ssl_cache_context ) );
cache->timeout = SSL_CACHE_DEFAULT_TIMEOUT;
cache->max_entries = SSL_CACHE_DEFAULT_MAX_ENTRIES;
}
int ssl_cache_get( void *data, ssl_session *session )
{
time_t t = time( NULL );
ssl_cache_context *cache = (ssl_cache_context *) data;
ssl_cache_entry *cur, *entry;
cur = cache->chain;
entry = NULL;
while( cur != NULL )
{
entry = cur;
cur = cur->next;
if( cache->timeout != 0 &&
(int) ( t - entry->timestamp ) > cache->timeout )
continue;
if( session->ciphersuite != entry->session.ciphersuite ||
session->compression != entry->session.compression ||
session->length != entry->session.length )
continue;
if( memcmp( session->id, entry->session.id,
entry->session.length ) != 0 )
continue;
memcpy( session->master, entry->session.master, 48 );
#if defined(POLARSSL_X509_PARSE_C)
/*
* Restore peer certificate (without rest of the original chain)
*/
if( entry->peer_cert.p != NULL )
{
session->peer_cert = (x509_cert *) polarssl_malloc( sizeof(x509_cert) );
if( session->peer_cert == NULL )
return( 1 );
memset( session->peer_cert, 0, sizeof(x509_cert) );
if( x509parse_crt( session->peer_cert, entry->peer_cert.p,
entry->peer_cert.len ) != 0 )
{
polarssl_free( session->peer_cert );
session->peer_cert = NULL;
return( 1 );
}
}
#endif /* POLARSSL_X509_PARSE_C */
return( 0 );
}
return( 1 );
}
int ssl_cache_set( void *data, const ssl_session *session )
{
time_t t = time( NULL ), oldest = 0;
ssl_cache_context *cache = (ssl_cache_context *) data;
ssl_cache_entry *cur, *prv, *old = NULL;
int count = 0;
cur = cache->chain;
prv = NULL;
while( cur != NULL )
{
count++;
if( cache->timeout != 0 &&
(int) ( t - cur->timestamp ) > cache->timeout )
{
cur->timestamp = t;
break; /* expired, reuse this slot, update timestamp */
}
if( memcmp( session->id, cur->session.id, cur->session.length ) == 0 )
break; /* client reconnected, keep timestamp for session id */
if( oldest == 0 || cur->timestamp < oldest )
{
oldest = cur->timestamp;
old = cur;
}
prv = cur;
cur = cur->next;
}
if( cur == NULL )
{
/*
* Reuse oldest entry if max_entries reached
*/
if( old != NULL && count >= cache->max_entries )
{
cur = old;
memset( &cur->session, 0, sizeof(ssl_session) );
#if defined(POLARSSL_X509_PARSE_C)
if( cur->peer_cert.p != NULL )
{
polarssl_free( cur->peer_cert.p );
memset( &cur->peer_cert, 0, sizeof(x509_buf) );
}
#endif /* POLARSSL_X509_PARSE_C */
}
else
{
cur = (ssl_cache_entry *) polarssl_malloc( sizeof(ssl_cache_entry) );
if( cur == NULL )
return( 1 );
memset( cur, 0, sizeof(ssl_cache_entry) );
if( prv == NULL )
cache->chain = cur;
else
prv->next = cur;
}
cur->timestamp = t;
}
memcpy( &cur->session, session, sizeof( ssl_session ) );
#if defined(POLARSSL_X509_PARSE_C)
/*
* Store peer certificate
*/
if( session->peer_cert != NULL )
{
cur->peer_cert.p = (unsigned char *) polarssl_malloc( session->peer_cert->raw.len );
if( cur->peer_cert.p == NULL )
return( 1 );
memcpy( cur->peer_cert.p, session->peer_cert->raw.p,
session->peer_cert->raw.len );
cur->peer_cert.len = session->peer_cert->raw.len;
cur->session.peer_cert = NULL;
}
#endif /* POLARSSL_X509_PARSE_C */
return( 0 );
}
void ssl_cache_set_timeout( ssl_cache_context *cache, int timeout )
{
if( timeout < 0 ) timeout = 0;
cache->timeout = timeout;
}
void ssl_cache_set_max_entries( ssl_cache_context *cache, int max )
{
if( max < 0 ) max = 0;
cache->max_entries = max;
}
void ssl_cache_free( ssl_cache_context *cache )
{
ssl_cache_entry *cur, *prv;
cur = cache->chain;
while( cur != NULL )
{
prv = cur;
cur = cur->next;
ssl_session_free( &prv->session );
#if defined(POLARSSL_X509_PARSE_C)
if( prv->peer_cert.p != NULL )
polarssl_free( prv->peer_cert.p );
#endif /* POLARSSL_X509_PARSE_C */
polarssl_free( prv );
}
}
#endif /* POLARSSL_SSL_CACHE_C */