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/* ====================================================================
* Copyright 2004 Paul Querna
*
* Licensed 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.
*
*/
#include "mod_gnutls.h"
#include "ap_mpm.h"
/**
* GnuTLS Session Cache using libmemcached
*
*/
/* The underlying apr_memcache system is thread safe... woohoo */
static apr_memcache_t* mc;
int mod_gnutls_cache_child_init(apr_pool_t *p, server_rec *s,
mod_gnutls_srvconf_rec *sc)
{
apr_status_t rv = APR_SUCCESS;
int thread_limit = 0;
int nservers = 0;
char* cache_config;
char* split;
char* tok;
ap_mpm_query(AP_MPMQ_HARD_LIMIT_THREADS, &thread_limit);
/* Find all the servers in the first run to get a total count */
cache_config = apr_pstrdup(p, sc->cache_config);
split = apr_strtok(cache_config, " ", &tok);
while (split) {
nservers++;
split = apr_strtok(NULL," ", &tok);
}
rv = apr_memcache_create(p, nservers, 0, &mc);
if (rv != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_CRIT, rv, s,
"[gnutls_cache] Failed to create Memcache Object of '%d' size.",
nservers);
return rv;
}
/* Now add each server to the memcache */
cache_config = apr_pstrdup(p, sc->cache_config);
split = apr_strtok(cache_config, " ", &tok);
while (split) {
apr_memcache_server_t* st;
char* split2;
char* host_str;
char* port_str;
int port;
host_str = apr_strtok(split,":", &split2);
port_str = apr_strtok(NULL,":", &split2);
if (!port_str) {
port = 11211; /* default port */
}
else {
port = atoi(port_str);
}
/* Should Max Conns be (thread_limit / nservers) ? */
rv = apr_memcache_server_create(p,
host_str, port,
0,
1,
thread_limit,
600,
&st);
if(rv != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_CRIT, rv, s,
"[gnutls_cache] Failed to Create Server: %s:%d",
host_str, port);
return rv;
}
rv = apr_memcache_add_server(mc, st);
if(rv != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_CRIT, rv, s,
"[gnutls_cache] Failed to Add Server: %s:%d",
host_str, port);
return rv;
}
split = apr_strtok(NULL," ", &tok);
}
return rv;
}
/* thanks mod_ssl */
#define GNUTLS_SESSION_ID_STRING_LEN \
((GNUTLS_MAX_SESSION_ID + 1) * 2)
#define MC_TAG "mod_gnutls:"
#define MC_TAG_LEN \
(sizeof(MC_TAG))
#define STR_SESSION_LEN (GNUTLS_SESSION_ID_STRING_LEN + MC_TAG_LEN)
static char *gnutls_session_id2sz(unsigned char *id, int idlen,
char *str, int strsize)
{
char *cp;
int n;
cp = apr_cpystrn(str, MC_TAG, MC_TAG_LEN);
for (n = 0; n < idlen && n < GNUTLS_MAX_SESSION_ID; n++) {
apr_snprintf(cp, strsize - (cp-str), "%02X", id[n]);
cp += 2;
}
*cp = '\0';
return str;
}
static int cache_store(void* baton, gnutls_datum_t key, gnutls_datum_t data)
{
apr_status_t rv = APR_SUCCESS;
mod_gnutls_handle_t *ctxt = baton;
char buf[STR_SESSION_LEN];
char* strkey = NULL;
apr_uint32_t timeout;
strkey = gnutls_session_id2sz(key.data, key.size, buf, sizeof(buf));
if(!strkey)
return -1;
timeout = 3600;
rv = apr_memcache_set(mc, strkey, data.data, data.size, timeout, 0);
if(rv != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_CRIT, rv,
ctxt->c->base_server,
"[gnutls_cache] error setting key '%s' "
"with %d bytes of data", strkey, data.size);
return -1;
}
return 0;
}
static gnutls_datum_t cache_fetch(void* baton, gnutls_datum_t key)
{
apr_status_t rv = APR_SUCCESS;
mod_gnutls_handle_t *ctxt = baton;
char buf[STR_SESSION_LEN];
char* strkey = NULL;
char* value;
apr_size_t value_len;
gnutls_datum_t data = { NULL, 0 };
strkey = gnutls_session_id2sz(key.data, key.size, buf, sizeof(buf));
if(!strkey) {
return data;
}
rv = apr_memcache_getp(mc, ctxt->c->pool, strkey,
&value, &value_len, NULL);
if(rv != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_DEBUG, rv,
ctxt->c->base_server,
"[gnutls_cache] error fetching key '%s' ",
strkey);
data.size = 0;
data.data = NULL;
return data;
}
/* TODO: Eliminate this memcpy. ffs. gnutls-- */
data.data = gnutls_malloc(value_len);
if (data.data == NULL)
return data;
data.size = value_len;
memcpy(data.data, value, value_len);
return data;
}
static int cache_delete(void* baton, gnutls_datum_t key)
{
apr_status_t rv = APR_SUCCESS;
mod_gnutls_handle_t *ctxt = baton;
char buf[STR_SESSION_LEN];
char* strkey = NULL;
strkey = gnutls_session_id2sz(key.data, key.size, buf, sizeof(buf));
if(!strkey)
return -1;
rv = apr_memcache_delete(mc, strkey, 0);
if(rv != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_DEBUG, rv,
ctxt->c->base_server,
"[gnutls_cache] error deleting key '%s' ",
strkey);
return -1;
}
return 0;
}
int mod_gnutls_cache_session_init(mod_gnutls_handle_t *ctxt)
{
gnutls_db_set_retrieve_function(ctxt->session, cache_fetch);
gnutls_db_set_remove_function(ctxt->session, cache_delete);
gnutls_db_set_store_function(ctxt->session, cache_store);
gnutls_db_set_ptr(ctxt->session, ctxt);
return 0;
}
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