756 lines
16 KiB
C
756 lines
16 KiB
C
/* Dynamic fetching of X.509 CRLs
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* Copyright (C) 2002 Stephane Laroche <stephane.laroche@colubris.com>
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* Copyright (C) 2002-2004 Andreas Steffen, Zuercher Hochschule Winterthur
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* RCSID $Id$
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*/
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#include <stdlib.h>
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#include <errno.h>
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#include <sys/time.h>
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#include <time.h>
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#include <string.h>
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#ifdef THREADS
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#include <pthread.h>
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#endif
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#include <freeswan.h>
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#include <library.h>
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#include <debug.h>
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#include <asn1/asn1.h>
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#include "constants.h"
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#include "defs.h"
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#include "log.h"
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#include "id.h"
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#include "pem.h"
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#include "x509.h"
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#include "ca.h"
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#include "whack.h"
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#include "ocsp.h"
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#include "crl.h"
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#include "fetch.h"
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fetch_req_t empty_fetch_req = {
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NULL , /* next */
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0 , /* installed */
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0 , /* trials */
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{ NULL, 0}, /* issuer */
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{ NULL, 0}, /* authKeyID */
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{ NULL, 0}, /* authKeySerialNumber */
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NULL /* distributionPoints */
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};
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/* chained list of crl fetch requests */
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static fetch_req_t *crl_fetch_reqs = NULL;
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/* chained list of ocsp fetch requests */
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static ocsp_location_t *ocsp_fetch_reqs = NULL;
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#ifdef THREADS
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static pthread_t thread;
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static pthread_mutex_t certs_and_keys_mutex = PTHREAD_MUTEX_INITIALIZER;
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static pthread_mutex_t authcert_list_mutex = PTHREAD_MUTEX_INITIALIZER;
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static pthread_mutex_t crl_list_mutex = PTHREAD_MUTEX_INITIALIZER;
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static pthread_mutex_t ocsp_cache_mutex = PTHREAD_MUTEX_INITIALIZER;
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static pthread_mutex_t ca_info_list_mutex = PTHREAD_MUTEX_INITIALIZER;
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static pthread_mutex_t crl_fetch_list_mutex = PTHREAD_MUTEX_INITIALIZER;
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static pthread_mutex_t ocsp_fetch_list_mutex = PTHREAD_MUTEX_INITIALIZER;
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static pthread_mutex_t fetch_wake_mutex = PTHREAD_MUTEX_INITIALIZER;
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static pthread_cond_t fetch_wake_cond = PTHREAD_COND_INITIALIZER;
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/**
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* lock access to my certs and keys
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*/
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void lock_certs_and_keys(const char *who)
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{
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pthread_mutex_lock(&certs_and_keys_mutex);
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DBG(DBG_CONTROLMORE,
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DBG_log("certs and keys locked by '%s'", who)
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)
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}
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/**
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* Unlock access to my certs and keys
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*/
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void unlock_certs_and_keys(const char *who)
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{
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DBG(DBG_CONTROLMORE,
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DBG_log("certs and keys unlocked by '%s'", who)
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)
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pthread_mutex_unlock(&certs_and_keys_mutex);
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}
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/**
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* Lock access to the chained authcert list
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*/
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void lock_authcert_list(const char *who)
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{
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pthread_mutex_lock(&authcert_list_mutex);
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DBG(DBG_CONTROLMORE,
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DBG_log("authcert list locked by '%s'", who)
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)
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}
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/**
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* Unlock access to the chained authcert list
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*/
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void unlock_authcert_list(const char *who)
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{
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DBG(DBG_CONTROLMORE,
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DBG_log("authcert list unlocked by '%s'", who)
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)
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pthread_mutex_unlock(&authcert_list_mutex);
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}
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/**
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* Lock access to the chained crl list
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*/
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void lock_crl_list(const char *who)
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{
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pthread_mutex_lock(&crl_list_mutex);
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DBG(DBG_CONTROLMORE,
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DBG_log("crl list locked by '%s'", who)
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)
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}
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/**
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* Unlock access to the chained crl list
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*/
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void unlock_crl_list(const char *who)
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{
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DBG(DBG_CONTROLMORE,
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DBG_log("crl list unlocked by '%s'", who)
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)
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pthread_mutex_unlock(&crl_list_mutex);
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}
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/**
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* Lock access to the ocsp cache
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*/
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extern void lock_ocsp_cache(const char *who)
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{
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pthread_mutex_lock(&ocsp_cache_mutex);
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DBG(DBG_CONTROLMORE,
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DBG_log("ocsp cache locked by '%s'", who)
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)
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}
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/**
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* Unlock access to the ocsp cache
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*/
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extern void unlock_ocsp_cache(const char *who)
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{
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DBG(DBG_CONTROLMORE,
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DBG_log("ocsp cache unlocked by '%s'", who)
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)
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pthread_mutex_unlock(&ocsp_cache_mutex);
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}
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/**
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* Lock access to the ca info list
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*/
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extern void lock_ca_info_list(const char *who)
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{
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pthread_mutex_lock(&ca_info_list_mutex);
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DBG(DBG_CONTROLMORE,
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DBG_log("ca info list locked by '%s'", who)
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)
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}
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/**
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* Unlock access to the ca info list
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*/
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extern void unlock_ca_info_list(const char *who)
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{
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DBG(DBG_CONTROLMORE,
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DBG_log("ca info list unlocked by '%s'", who)
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)
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pthread_mutex_unlock(&ca_info_list_mutex);
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}
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/**
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* Lock access to the chained crl fetch request list
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*/
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static void lock_crl_fetch_list(const char *who)
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{
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pthread_mutex_lock(&crl_fetch_list_mutex);
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DBG(DBG_CONTROLMORE,
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DBG_log("crl fetch request list locked by '%s'", who)
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)
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}
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/**
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* Unlock access to the chained crl fetch request list
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*/
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static void unlock_crl_fetch_list(const char *who)
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{
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DBG(DBG_CONTROLMORE,
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DBG_log("crl fetch request list unlocked by '%s'", who)
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)
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pthread_mutex_unlock(&crl_fetch_list_mutex);
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}
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/**
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* Lock access to the chained ocsp fetch request list
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*/
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static void lock_ocsp_fetch_list(const char *who)
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{
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pthread_mutex_lock(&ocsp_fetch_list_mutex);
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DBG(DBG_CONTROLMORE,
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DBG_log("ocsp fetch request list locked by '%s'", who)
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)
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}
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/**
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* Unlock access to the chained ocsp fetch request list
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*/
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static void unlock_ocsp_fetch_list(const char *who)
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{
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DBG(DBG_CONTROLMORE,
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DBG_log("ocsp fetch request list unlocked by '%s'", who)
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)
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pthread_mutex_unlock(&ocsp_fetch_list_mutex);
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}
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/**
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* Wakes up the sleeping fetch thread
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*/
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void wake_fetch_thread(const char *who)
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{
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if (crl_check_interval > 0)
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{
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DBG(DBG_CONTROLMORE,
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DBG_log("fetch thread wake call by '%s'", who)
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)
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pthread_mutex_lock(&fetch_wake_mutex);
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pthread_cond_signal(&fetch_wake_cond);
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pthread_mutex_unlock(&fetch_wake_mutex);
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}
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}
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#else /* !THREADS */
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#define lock_crl_fetch_list(who) /* do nothing */
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#define unlock_crl_fetch_list(who) /* do nothing */
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#define lock_ocsp_fetch_list(who) /* do nothing */
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#define unlock_ocsp_fetch_list(who) /* do nothing */
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#endif /* !THREADS */
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/**
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* Free the dynamic memory used to store fetch requests
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*/
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static void free_fetch_request(fetch_req_t *req)
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{
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free(req->issuer.ptr);
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free(req->authKeySerialNumber.ptr);
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free(req->authKeyID.ptr);
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free_generalNames(req->distributionPoints, TRUE);
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free(req);
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}
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#ifdef THREADS
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/**
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* Fetch an ASN.1 blob coded in PEM or DER format from a URL
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*/
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bool fetch_asn1_blob(char *url, chunk_t *blob)
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{
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err_t ugh = NULL;
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DBG1(" fetching crl from '%s' ...", url);
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if (lib->fetcher->fetch(lib->fetcher, url, blob, FETCH_END) != SUCCESS)
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{
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DBG1("crl fetching failed");
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return FALSE;
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}
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if (is_asn1(*blob))
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{
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DBG2(" fetched blob coded in DER format");
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}
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else
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{
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bool pgp = FALSE;
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ugh = pemtobin(blob, NULL, "", &pgp);
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if (ugh != NULL)
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{
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free(blob->ptr);
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return FALSE;
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};
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if (is_asn1(*blob))
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{
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DBG2(" fetched blob coded in PEM format");
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}
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else
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{
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DBG1("crl fetched successfully but data coded in unknown format");
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free(blob->ptr);
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return FALSE;
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}
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}
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return TRUE;
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}
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/**
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* Complete a distributionPoint URI with ca information
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*/
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static char* complete_uri(chunk_t distPoint, const char *ldaphost)
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{
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char *uri;
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char *ptr = distPoint.ptr;
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size_t len = distPoint.len;
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char *symbol = memchr(ptr, ':', len);
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if (symbol != NULL)
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{
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size_t type_len = symbol - ptr;
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if (type_len >= 4 && strncasecmp(ptr, "ldap", 4) == 0)
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{
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ptr = symbol + 1;
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len -= (type_len + 1);
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if (len > 2 && *ptr++ == '/' && *ptr++ == '/')
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{
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len -= 2;
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symbol = memchr(ptr, '/', len);
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if (symbol != NULL && symbol - ptr == 0 && ldaphost != NULL)
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{
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uri = malloc(distPoint.len + strlen(ldaphost) + 1);
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/* insert the ldaphost into the uri */
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sprintf(uri, "%.*s%s%.*s"
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, (int)(distPoint.len - len), distPoint.ptr
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, ldaphost
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, (int)len, symbol);
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return uri;
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}
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}
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}
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}
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/* default action: copy distributionPoint without change */
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uri = malloc(distPoint.len + 1);
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sprintf(uri, "%.*s", (int)distPoint.len, distPoint.ptr);
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return uri;
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}
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/**
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* Try to fetch the crls defined by the fetch requests
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*/
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static void fetch_crls(bool cache_crls)
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{
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fetch_req_t *req;
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fetch_req_t **reqp;
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lock_crl_fetch_list("fetch_crls");
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req = crl_fetch_reqs;
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reqp = &crl_fetch_reqs;
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while (req != NULL)
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{
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bool valid_crl = FALSE;
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chunk_t blob = chunk_empty;
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generalName_t *gn = req->distributionPoints;
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const char *ldaphost;
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ca_info_t *ca;
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lock_ca_info_list("fetch_crls");
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ca = get_ca_info(req->issuer, req->authKeySerialNumber, req->authKeyID);
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ldaphost = (ca == NULL)? NULL : ca->ldaphost;
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while (gn != NULL)
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{
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char *uri = complete_uri(gn->name, ldaphost);
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if (fetch_asn1_blob(uri, &blob))
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{
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chunk_t crl_uri = chunk_clone(gn->name);
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if (insert_crl(blob, crl_uri, cache_crls))
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{
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DBG(DBG_CONTROL,
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DBG_log("we have a valid crl")
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)
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valid_crl = TRUE;
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free(uri);
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break;
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}
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}
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free(uri);
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gn = gn->next;
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}
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unlock_ca_info_list("fetch_crls");
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if (valid_crl)
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{
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/* delete fetch request */
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fetch_req_t *req_free = req;
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req = req->next;
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*reqp = req;
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free_fetch_request(req_free);
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}
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else
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{
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/* try again next time */
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req->trials++;
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reqp = &req->next;
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req = req->next;
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}
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}
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unlock_crl_fetch_list("fetch_crls");
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}
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static void fetch_ocsp_status(ocsp_location_t* location)
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{
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chunk_t request, response;
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char *uri;
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request = build_ocsp_request(location);
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response = chunk_empty;
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/* we need a null terminated string for curl */
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uri = malloc(location->uri.len + 1);
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memcpy(uri, location->uri.ptr, location->uri.len);
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*(uri + location->uri.len) = '\0';
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DBG1(" requesting ocsp status from '%s' ...", uri);
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if (lib->fetcher->fetch(lib->fetcher, uri, &response,
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FETCH_REQUEST_DATA, request,
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FETCH_REQUEST_TYPE, "application/ocsp-request",
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FETCH_END) == SUCCESS)
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{
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parse_ocsp(location, response);
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}
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else
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{
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DBG1("ocsp request to %s failed", uri);
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}
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free(uri);
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free(request.ptr);
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chunk_free(&location->nonce);
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/* increment the trial counter of the unresolved fetch requests */
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{
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ocsp_certinfo_t *certinfo = location->certinfo;
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while (certinfo != NULL)
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{
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certinfo->trials++;
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certinfo = certinfo->next;
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}
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}
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}
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/**
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* Try to fetch the necessary ocsp information
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*/
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static void fetch_ocsp(void)
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{
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ocsp_location_t *location;
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lock_ocsp_fetch_list("fetch_ocsp");
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location = ocsp_fetch_reqs;
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/* fetch the ocps status for all locations */
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while (location != NULL)
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{
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if (location->certinfo != NULL)
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{
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fetch_ocsp_status(location);
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}
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location = location->next;
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}
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unlock_ocsp_fetch_list("fetch_ocsp");
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}
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static void* fetch_thread(void *arg)
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{
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struct timespec wait_interval;
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DBG(DBG_CONTROL,
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DBG_log("fetch thread started")
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)
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pthread_mutex_lock(&fetch_wake_mutex);
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while(1)
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{
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int status;
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wait_interval.tv_nsec = 0;
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wait_interval.tv_sec = time(NULL) + crl_check_interval;
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DBG(DBG_CONTROL,
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DBG_log("next regular crl check in %ld seconds", crl_check_interval)
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)
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status = pthread_cond_timedwait(&fetch_wake_cond, &fetch_wake_mutex
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, &wait_interval);
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if (status == ETIMEDOUT)
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{
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DBG(DBG_CONTROL,
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DBG_log(" ");
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DBG_log("*time to check crls and the ocsp cache")
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)
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check_ocsp();
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check_crls();
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}
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else
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{
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DBG(DBG_CONTROL,
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DBG_log("fetch thread was woken up")
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)
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}
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fetch_ocsp();
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fetch_crls(cache_crls);
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}
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}
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#endif /* THREADS*/
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/**
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* Initializes curl and starts the fetching thread
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*/
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void init_fetch(void)
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{
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if (crl_check_interval > 0)
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{
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#ifdef THREADS
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int status = pthread_create( &thread, NULL, fetch_thread, NULL);
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if (status != 0)
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{
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plog("fetching thread could not be started, status = %d", status);
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}
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#else /* !THREADS */
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plog("warning: not compiled with pthread support");
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#endif /* !THREADS */
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}
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}
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void free_crl_fetch(void)
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{
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lock_crl_fetch_list("free_crl_fetch");
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while (crl_fetch_reqs != NULL)
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{
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fetch_req_t *req = crl_fetch_reqs;
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crl_fetch_reqs = req->next;
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free_fetch_request(req);
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}
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unlock_crl_fetch_list("free_crl_fetch");
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}
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/**
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* Free the chained list of ocsp requests
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*/
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void free_ocsp_fetch(void)
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{
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lock_ocsp_fetch_list("free_ocsp_fetch");
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free_ocsp_locations(&ocsp_fetch_reqs);
|
|
unlock_ocsp_fetch_list("free_ocsp_fetch");
|
|
}
|
|
|
|
|
|
/**
|
|
* Add additional distribution points
|
|
*/
|
|
void add_distribution_points(const generalName_t *newPoints ,generalName_t **distributionPoints)
|
|
{
|
|
while (newPoints != NULL)
|
|
{
|
|
/* skip empty distribution point */
|
|
if (newPoints->name.len > 0)
|
|
{
|
|
bool add = TRUE;
|
|
generalName_t *gn = *distributionPoints;
|
|
|
|
while (gn != NULL)
|
|
{
|
|
if (gn->kind == newPoints->kind
|
|
&& gn->name.len == newPoints->name.len
|
|
&& memeq(gn->name.ptr, newPoints->name.ptr, gn->name.len))
|
|
{
|
|
/* skip if the distribution point is already present */
|
|
add = FALSE;
|
|
break;
|
|
}
|
|
gn = gn->next;
|
|
}
|
|
|
|
if (add)
|
|
{
|
|
/* clone additional distribution point */
|
|
gn = clone_thing(*newPoints);
|
|
gn->name = chunk_clone(newPoints->name);
|
|
|
|
/* insert additional CRL distribution point */
|
|
gn->next = *distributionPoints;
|
|
*distributionPoints = gn;
|
|
}
|
|
}
|
|
newPoints = newPoints->next;
|
|
}
|
|
}
|
|
|
|
fetch_req_t* build_crl_fetch_request(chunk_t issuer, chunk_t authKeySerialNumber,
|
|
chunk_t authKeyID, const generalName_t *gn)
|
|
{
|
|
fetch_req_t *req = malloc_thing(fetch_req_t);
|
|
*req = empty_fetch_req;
|
|
|
|
/* note current time */
|
|
req->installed = time(NULL);
|
|
|
|
/* clone fields */
|
|
req->issuer = chunk_clone(issuer);
|
|
req->authKeySerialNumber = chunk_clone(authKeySerialNumber);
|
|
req->authKeyID = chunk_clone(authKeyID);
|
|
|
|
/* copy distribution points */
|
|
add_distribution_points(gn, &req->distributionPoints);
|
|
|
|
return req;
|
|
}
|
|
|
|
/**
|
|
* Add a crl fetch request to the chained list
|
|
*/
|
|
void add_crl_fetch_request(fetch_req_t *req)
|
|
{
|
|
fetch_req_t *r;
|
|
|
|
lock_crl_fetch_list("add_crl_fetch_request");
|
|
r = crl_fetch_reqs;
|
|
|
|
while (r != NULL)
|
|
{
|
|
if ((req->authKeyID.ptr != NULL)? same_keyid(req->authKeyID, r->authKeyID)
|
|
: (same_dn(req->issuer, r->issuer)
|
|
&& same_serial(req->authKeySerialNumber, r->authKeySerialNumber)))
|
|
{
|
|
/* there is already a fetch request */
|
|
DBG(DBG_CONTROL,
|
|
DBG_log("crl fetch request already exists")
|
|
)
|
|
|
|
/* there might be new distribution points */
|
|
add_distribution_points(req->distributionPoints, &r->distributionPoints);
|
|
|
|
unlock_crl_fetch_list("add_crl_fetch_request");
|
|
free_fetch_request(req);
|
|
return;
|
|
}
|
|
r = r->next;
|
|
}
|
|
|
|
/* insert new fetch request at the head of the queue */
|
|
req->next = crl_fetch_reqs;
|
|
crl_fetch_reqs = req;
|
|
|
|
DBG(DBG_CONTROL,
|
|
DBG_log("crl fetch request added")
|
|
)
|
|
unlock_crl_fetch_list("add_crl_fetch_request");
|
|
}
|
|
|
|
/**
|
|
* Add an ocsp fetch request to the chained list
|
|
*/
|
|
void add_ocsp_fetch_request(ocsp_location_t *location, chunk_t serialNumber)
|
|
{
|
|
ocsp_certinfo_t certinfo;
|
|
|
|
certinfo.serialNumber = serialNumber;
|
|
|
|
lock_ocsp_fetch_list("add_ocsp_fetch_request");
|
|
add_certinfo(location, &certinfo, &ocsp_fetch_reqs, TRUE);
|
|
unlock_ocsp_fetch_list("add_ocsp_fetch_request");
|
|
}
|
|
|
|
/**
|
|
* List all distribution points
|
|
*/
|
|
void list_distribution_points(const generalName_t *gn)
|
|
{
|
|
bool first_gn = TRUE;
|
|
|
|
while (gn != NULL)
|
|
{
|
|
whack_log(RC_COMMENT, " %s '%.*s'", (first_gn)? "distPts: "
|
|
:" ", (int)gn->name.len, gn->name.ptr);
|
|
first_gn = FALSE;
|
|
gn = gn->next;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* List all fetch requests in the chained list
|
|
*/
|
|
void list_crl_fetch_requests(bool utc)
|
|
{
|
|
fetch_req_t *req;
|
|
|
|
lock_crl_fetch_list("list_crl_fetch_requests");
|
|
req = crl_fetch_reqs;
|
|
|
|
if (req != NULL)
|
|
{
|
|
whack_log(RC_COMMENT, " ");
|
|
whack_log(RC_COMMENT, "List of CRL fetch requests:");
|
|
whack_log(RC_COMMENT, " ");
|
|
}
|
|
|
|
while (req != NULL)
|
|
{
|
|
u_char buf[BUF_LEN];
|
|
|
|
whack_log(RC_COMMENT, "%T, trials: %d"
|
|
, &req->installed, utc, req->trials);
|
|
dntoa(buf, BUF_LEN, req->issuer);
|
|
whack_log(RC_COMMENT, " issuer: '%s'", buf);
|
|
if (req->authKeyID.ptr != NULL)
|
|
{
|
|
datatot(req->authKeyID.ptr, req->authKeyID.len, ':'
|
|
, buf, BUF_LEN);
|
|
whack_log(RC_COMMENT, " authkey: %s", buf);
|
|
}
|
|
if (req->authKeySerialNumber.ptr != NULL)
|
|
{
|
|
datatot(req->authKeySerialNumber.ptr, req->authKeySerialNumber.len, ':'
|
|
, buf, BUF_LEN);
|
|
whack_log(RC_COMMENT, " aserial: %s", buf);
|
|
}
|
|
list_distribution_points(req->distributionPoints);
|
|
req = req->next;
|
|
}
|
|
unlock_crl_fetch_list("list_crl_fetch_requests");
|
|
}
|
|
|
|
void list_ocsp_fetch_requests(bool utc)
|
|
{
|
|
lock_ocsp_fetch_list("list_ocsp_fetch_requests");
|
|
list_ocsp_locations(ocsp_fetch_reqs, TRUE, utc, FALSE);
|
|
unlock_ocsp_fetch_list("list_ocsp_fetch_requests");
|
|
|
|
}
|