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/* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* _ _
* _ __ ___ ___ __| | ___ ___| | mod_ssl
* | '_ ` _ \ / _ \ / _` | / __/ __| | Apache Interface to OpenSSL
* | | | | | | (_) | (_| | \__ \__ \ |
* |_| |_| |_|\___/ \__,_|___|___/___/_|
* |_____|
* ssl_scache.c
* Session Cache Abstraction
*/
/* ``Open-Source Software: generous
programmers from around the world all
join forces to help you shoot
yourself in the foot for free.''
-- Unknown */
#include "ssl_private.h"
#include "mod_status.h"
/* _________________________________________________________________
**
** Session Cache: Common Abstraction Layer
** _________________________________________________________________
*/
apr_status_t ssl_scache_init(server_rec *s, apr_pool_t *p)
{
SSLModConfigRec *mc = myModConfig(s);
apr_status_t rv;
struct ap_socache_hints hints;
/* The very first invocation of this function will be the
* post_config invocation during server startup; do nothing for
* this first (and only the first) time through, since the pool
* will be immediately cleared anyway. For every subsequent
* invocation, initialize the configured cache. */
if (ap_state_query(AP_SQ_MAIN_STATE) == AP_SQ_MS_CREATE_PRE_CONFIG)
return APR_SUCCESS;
#ifdef HAVE_OCSP_STAPLING
if (mc->stapling_cache) {
memset(&hints, 0, sizeof hints);
hints.avg_obj_size = 1500;
hints.avg_id_len = 20;
hints.expiry_interval = 300;
rv = mc->stapling_cache->init(mc->stapling_cache_context,
"mod_ssl-stapling", &hints, s, p);
if (rv) {
ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(01872)
"Could not initialize stapling cache. Exiting.");
return ssl_die(s);
}
}
#endif
/*
* Warn the user that he should use the session cache.
* But we can operate without it, of course.
*/
if (mc->sesscache == NULL) {
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(01873)
"Init: Session Cache is not configured "
"[hint: SSLSessionCache]");
return APR_SUCCESS;
}
memset(&hints, 0, sizeof hints);
hints.avg_obj_size = 150;
hints.avg_id_len = 30;
hints.expiry_interval = 30;
rv = mc->sesscache->init(mc->sesscache_context, "mod_ssl-session", &hints, s, p);
if (rv) {
ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(01874)
"Could not initialize session cache. Exiting.");
return ssl_die(s);
}
return APR_SUCCESS;
}
void ssl_scache_kill(server_rec *s)
{
SSLModConfigRec *mc = myModConfig(s);
if (mc->sesscache) {
mc->sesscache->destroy(mc->sesscache_context, s);
}
#ifdef HAVE_OCSP_STAPLING
if (mc->stapling_cache) {
mc->stapling_cache->destroy(mc->stapling_cache_context, s);
}
#endif
}
BOOL ssl_scache_store(server_rec *s, UCHAR *id, int idlen,
apr_time_t expiry, SSL_SESSION *sess,
apr_pool_t *p)
{
SSLModConfigRec *mc = myModConfig(s);
unsigned char encoded[SSL_SESSION_MAX_DER], *ptr;
unsigned int len;
apr_status_t rv;
/* Serialise the session. */
len = i2d_SSL_SESSION(sess, NULL);
if (len > sizeof encoded) {
ap_log_error(APLOG_MARK, APLOG_ERR, 0, s, APLOGNO(01875)
"session is too big (%u bytes)", len);
return FALSE;
}
ptr = encoded;
len = i2d_SSL_SESSION(sess, &ptr);
if (mc->sesscache->flags & AP_SOCACHE_FLAG_NOTMPSAFE) {
ssl_mutex_on(s);
}
rv = mc->sesscache->store(mc->sesscache_context, s, id, idlen,
expiry, encoded, len, p);
if (mc->sesscache->flags & AP_SOCACHE_FLAG_NOTMPSAFE) {
ssl_mutex_off(s);
}
return rv == APR_SUCCESS ? TRUE : FALSE;
}
SSL_SESSION *ssl_scache_retrieve(server_rec *s, UCHAR *id, int idlen,
apr_pool_t *p)
{
SSLModConfigRec *mc = myModConfig(s);
unsigned char dest[SSL_SESSION_MAX_DER];
unsigned int destlen = SSL_SESSION_MAX_DER;
const unsigned char *ptr;
apr_status_t rv;
if (mc->sesscache->flags & AP_SOCACHE_FLAG_NOTMPSAFE) {
ssl_mutex_on(s);
}
rv = mc->sesscache->retrieve(mc->sesscache_context, s, id, idlen,
dest, &destlen, p);
if (mc->sesscache->flags & AP_SOCACHE_FLAG_NOTMPSAFE) {
ssl_mutex_off(s);
}
if (rv != APR_SUCCESS) {
return NULL;
}
ptr = dest;
return d2i_SSL_SESSION(NULL, &ptr, destlen);
}
void ssl_scache_remove(server_rec *s, UCHAR *id, int idlen,
apr_pool_t *p)
{
SSLModConfigRec *mc = myModConfig(s);
if (mc->sesscache->flags & AP_SOCACHE_FLAG_NOTMPSAFE) {
ssl_mutex_on(s);
}
mc->sesscache->remove(mc->sesscache_context, s, id, idlen, p);
if (mc->sesscache->flags & AP_SOCACHE_FLAG_NOTMPSAFE) {
ssl_mutex_off(s);
}
}
/* _________________________________________________________________
**
** SSL Extension to mod_status
** _________________________________________________________________
*/
static int ssl_ext_status_hook(request_rec *r, int flags)
{
SSLModConfigRec *mc = myModConfig(r->server);
if (mc == NULL || flags & AP_STATUS_SHORT || mc->sesscache == NULL)
return OK;
ap_rputs("<hr>\n", r);
ap_rputs("<table cellspacing=0 cellpadding=0>\n", r);
ap_rputs("<tr><td bgcolor=\"#000000\">\n", r);
ap_rputs("<b><font color=\"#ffffff\" face=\"Arial,Helvetica\">SSL/TLS Session Cache Status:</font></b>\r", r);
ap_rputs("</td></tr>\n", r);
ap_rputs("<tr><td bgcolor=\"#ffffff\">\n", r);
if (mc->sesscache->flags & AP_SOCACHE_FLAG_NOTMPSAFE) {
ssl_mutex_on(r->server);
}
mc->sesscache->status(mc->sesscache_context, r, flags);
if (mc->sesscache->flags & AP_SOCACHE_FLAG_NOTMPSAFE) {
ssl_mutex_off(r->server);
}
ap_rputs("</td></tr>\n", r);
ap_rputs("</table>\n", r);
return OK;
}
void ssl_scache_status_register(apr_pool_t *p)
{
APR_OPTIONAL_HOOK(ap, status_hook, ssl_ext_status_hook, NULL, NULL,
APR_HOOK_MIDDLE);
}
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