639 lines
16 KiB
C
639 lines
16 KiB
C
/*
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* Copyright (C) 2006-2007 Tobias Brunner
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* Copyright (C) 2006 Daniel Roethlisberger
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* Copyright (C) 2005-2008 Martin Willi
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* Copyright (C) 2005 Jan Hutter
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* Hochschule fuer Technik Rapperswil
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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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#include <stdio.h>
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#include <linux/capability.h>
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#include <sys/prctl.h>
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#include <signal.h>
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#include <pthread.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <time.h>
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#include <string.h>
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#include <getopt.h>
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#include <errno.h>
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#include <pwd.h>
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#include <grp.h>
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#ifdef HAVE_BACKTRACE
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# include <execinfo.h>
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#endif /* HAVE_BACKTRACE */
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#include "daemon.h"
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#include <library.h>
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#include <config/traffic_selector.h>
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/* on some distros, a capset definition is missing */
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#ifdef NO_CAPSET_DEFINED
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extern int capset(cap_user_header_t hdrp, const cap_user_data_t datap);
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#endif /* NO_CAPSET_DEFINED */
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#ifdef INTEGRITY_TEST
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#include <fips/fips.h>
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#include <fips_signature.h>
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#endif /* INTEGRITY_TEST */
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typedef struct private_daemon_t private_daemon_t;
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/**
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* Private additions to daemon_t, contains threads and internal functions.
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*/
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struct private_daemon_t {
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/**
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* Public members of daemon_t.
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*/
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daemon_t public;
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/**
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* Signal set used for signal handling.
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*/
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sigset_t signal_set;
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/**
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* The thread_id of main-thread.
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*/
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pthread_t main_thread_id;
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};
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/**
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* One and only instance of the daemon.
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*/
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daemon_t *charon;
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/**
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* hook in library for debugging messages
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*/
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extern void (*dbg) (int level, char *fmt, ...);
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/**
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* Logging hook for library logs, spreads debug message over bus
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*/
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static void dbg_bus(int level, char *fmt, ...)
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{
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va_list args;
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va_start(args, fmt);
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charon->bus->vsignal(charon->bus, DBG_LIB, level, fmt, args);
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va_end(args);
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}
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/**
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* Logging hook for library logs, using stderr output
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*/
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static void dbg_stderr(int level, char *fmt, ...)
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{
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va_list args;
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if (level <= 1)
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{
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va_start(args, fmt);
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fprintf(stderr, "00[LIB] ");
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vfprintf(stderr, fmt, args);
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fprintf(stderr, "\n");
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va_end(args);
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}
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}
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/**
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* Run the daemon and handle unix signals
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*/
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static void run(private_daemon_t *this)
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{
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sigset_t set;
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/* handle SIGINT, SIGHUP ans SIGTERM in this handler */
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sigemptyset(&set);
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sigaddset(&set, SIGINT);
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sigaddset(&set, SIGHUP);
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sigaddset(&set, SIGTERM);
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while (TRUE)
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{
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int sig;
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int error;
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error = sigwait(&set, &sig);
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if (error)
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{
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DBG1(DBG_DMN, "error %d while waiting for a signal", error);
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return;
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}
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switch (sig)
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{
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case SIGHUP:
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{
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DBG1(DBG_DMN, "signal of type SIGHUP received. Ignored");
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break;
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}
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case SIGINT:
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{
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DBG1(DBG_DMN, "signal of type SIGINT received. Shutting down");
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return;
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}
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case SIGTERM:
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{
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DBG1(DBG_DMN, "signal of type SIGTERM received. Shutting down");
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return;
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}
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default:
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{
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DBG1(DBG_DMN, "unknown signal %d received. Ignored", sig);
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break;
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}
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}
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}
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}
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/**
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* Clean up all daemon resources
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*/
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static void destroy(private_daemon_t *this)
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{
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/* terminate all idle threads */
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if (this->public.processor)
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{
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this->public.processor->set_threads(this->public.processor, 0);
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}
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/* close all IKE_SAs */
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if (this->public.ike_sa_manager)
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{
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this->public.ike_sa_manager->flush(this->public.ike_sa_manager);
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}
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DESTROY_IF(this->public.plugins);
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DESTROY_IF(this->public.ike_sa_manager);
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DESTROY_IF(this->public.kernel_interface);
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DESTROY_IF(this->public.scheduler);
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DESTROY_IF(this->public.controller);
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DESTROY_IF(this->public.eap);
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#ifdef ME
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DESTROY_IF(this->public.connect_manager);
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DESTROY_IF(this->public.mediation_manager);
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#endif /* ME */
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DESTROY_IF(this->public.backends);
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DESTROY_IF(this->public.attributes);
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DESTROY_IF(this->public.credentials);
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DESTROY_IF(this->public.sender);
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DESTROY_IF(this->public.receiver);
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DESTROY_IF(this->public.socket);
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/* wait until all threads are gone */
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DESTROY_IF(this->public.processor);
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/* rehook library logging, shutdown logging */
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dbg = dbg_stderr;
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DESTROY_IF(this->public.bus);
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DESTROY_IF(this->public.outlog);
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DESTROY_IF(this->public.syslog);
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DESTROY_IF(this->public.authlog);
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free(this);
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}
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/**
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* Enforce daemon shutdown, with a given reason to do so.
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*/
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static void kill_daemon(private_daemon_t *this, char *reason)
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{
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/* we send SIGTERM, so the daemon can cleanly shut down */
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if (this->public.bus)
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{
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DBG1(DBG_DMN, "killing daemon: %s", reason);
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}
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else
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{
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fprintf(stderr, "killing daemon: %s\n", reason);
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}
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if (this->main_thread_id == pthread_self())
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{
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/* initialization failed, terminate daemon */
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unlink(PID_FILE);
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exit(-1);
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}
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else
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{
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DBG1(DBG_DMN, "sending SIGTERM to ourself");
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raise(SIGTERM);
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/* thread must die, since he produced a ciritcal failure and can't continue */
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pthread_exit(NULL);
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}
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}
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/**
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* drop daemon capabilities
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*/
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static void drop_capabilities(private_daemon_t *this, bool full)
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{
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struct __user_cap_header_struct hdr;
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struct __user_cap_data_struct data;
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/* CAP_NET_ADMIN is needed to use netlink */
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u_int32_t keep = (1<<CAP_NET_ADMIN) | (1<<CAP_SYS_NICE);
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if (full)
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{
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if (setgid(charon->gid) != 0)
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{
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kill_daemon(this, "change to unprivileged group failed");
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}
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if (setuid(charon->uid) != 0)
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{
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kill_daemon(this, "change to unprivileged user failed");
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}
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}
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else
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{
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/* CAP_NET_BIND_SERVICE to bind services below port 1024 */
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keep |= (1<<CAP_NET_BIND_SERVICE);
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/* CAP_NET_RAW to create RAW sockets */
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keep |= (1<<CAP_NET_RAW);
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/* CAP_DAC_READ_SEARCH to read ipsec.secrets */
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keep |= (1<<CAP_DAC_READ_SEARCH);
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/* CAP_CHOWN to change file permissions (socket permissions) */
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keep |= (1<<CAP_CHOWN);
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/* CAP_SETUID to call setuid() */
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keep |= (1<<CAP_SETUID);
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/* CAP_SETGID to call setgid() */
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keep |= (1<<CAP_SETGID);
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}
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/* we use the old capset version for now. For systems with version 2
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* available, we specifiy version 1 excplicitly. */
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#ifdef _LINUX_CAPABILITY_VERSION_1
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hdr.version = _LINUX_CAPABILITY_VERSION_1;
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#else
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hdr.version = _LINUX_CAPABILITY_VERSION;
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#endif
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hdr.pid = 0;
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data.inheritable = data.effective = data.permitted = keep;
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if (capset(&hdr, &data))
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{
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kill_daemon(this, "unable to drop daemon capabilities");
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}
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}
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/**
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* lookup UID and GID
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*/
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static void lookup_uid_gid(private_daemon_t *this)
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{
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#ifdef IPSEC_USER
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{
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char buf[1024];
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struct passwd passwd, *pwp;
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if (getpwnam_r(IPSEC_USER, &passwd, buf, sizeof(buf), &pwp) != 0 ||
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pwp == NULL)
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{
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kill_daemon(this, "resolving user '"IPSEC_USER"' failed");
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}
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charon->uid = pwp->pw_uid;
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}
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#endif
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#ifdef IPSEC_GROUP
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{
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char buf[1024];
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struct group group, *grp;
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if (getgrnam_r(IPSEC_GROUP, &group, buf, sizeof(buf), &grp) != 0 ||
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grp == NULL)
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{
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kill_daemon(this, "reslvoing group '"IPSEC_GROUP"' failed");
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}
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charon->gid = grp->gr_gid;
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}
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#endif
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}
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/**
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* Initialize the daemon
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*/
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static bool initialize(private_daemon_t *this, bool syslog, level_t levels[])
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{
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signal_t signal;
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/* for uncritical pseudo random numbers */
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srandom(time(NULL) + getpid());
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/* setup bus and it's listeners first to enable log output */
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this->public.bus = bus_create();
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this->public.outlog = file_logger_create(stdout);
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this->public.syslog = sys_logger_create(LOG_DAEMON);
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this->public.authlog = sys_logger_create(LOG_AUTHPRIV);
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this->public.bus->add_listener(this->public.bus, &this->public.syslog->listener);
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this->public.bus->add_listener(this->public.bus, &this->public.outlog->listener);
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this->public.bus->add_listener(this->public.bus, &this->public.authlog->listener);
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this->public.authlog->set_level(this->public.authlog, SIG_ANY, LEVEL_AUDIT);
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/* set up hook to log dbg message in library via charons message bus */
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dbg = dbg_bus;
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/* apply loglevels */
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for (signal = 0; signal < DBG_MAX; signal++)
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{
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this->public.syslog->set_level(this->public.syslog,
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signal, levels[signal]);
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if (!syslog)
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{
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this->public.outlog->set_level(this->public.outlog,
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signal, levels[signal]);
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}
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}
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DBG1(DBG_DMN, "starting charon (strongSwan Version %s)", VERSION);
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#ifdef INTEGRITY_TEST
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DBG1(DBG_DMN, "integrity test of libstrongswan code");
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if (fips_verify_hmac_signature(hmac_key, hmac_signature))
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{
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DBG1(DBG_DMN, " integrity test passed");
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}
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else
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{
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DBG1(DBG_DMN, " integrity test failed");
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return FALSE;
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}
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#endif /* INTEGRITY_TEST */
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this->public.ike_sa_manager = ike_sa_manager_create();
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if (this->public.ike_sa_manager == NULL)
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{
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return FALSE;
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}
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this->public.processor = processor_create();
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this->public.scheduler = scheduler_create();
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/* load secrets, ca certificates and crls */
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this->public.credentials = credential_manager_create();
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this->public.controller = controller_create();
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this->public.eap = eap_manager_create();
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this->public.backends = backend_manager_create();
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this->public.attributes = attribute_manager_create();
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this->public.plugins = plugin_loader_create();
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this->public.kernel_interface = kernel_interface_create();
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this->public.socket = socket_create();
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this->public.sender = sender_create();
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this->public.receiver = receiver_create();
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if (this->public.receiver == NULL)
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{
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return FALSE;
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}
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#ifdef ME
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this->public.connect_manager = connect_manager_create();
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if (this->public.connect_manager == NULL)
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{
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return FALSE;
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}
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this->public.mediation_manager = mediation_manager_create();
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#endif /* ME */
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this->public.plugins->load(this->public.plugins, IPSEC_PLUGINDIR, "libcharon-");
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return TRUE;
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}
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/**
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* Handle SIGSEGV/SIGILL signals raised by threads
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*/
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static void segv_handler(int signal)
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{
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#ifdef HAVE_BACKTRACE
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void *array[20];
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size_t size;
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char **strings;
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size_t i;
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size = backtrace(array, 20);
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strings = backtrace_symbols(array, size);
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DBG1(DBG_JOB, "thread %u received %s. Dumping %d frames from stack:",
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pthread_self(), signal == SIGSEGV ? "SIGSEGV" : "SIGILL", size);
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for (i = 0; i < size; i++)
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{
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DBG1(DBG_DMN, " %s", strings[i]);
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}
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free (strings);
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#else /* !HAVE_BACKTRACE */
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DBG1(DBG_DMN, "thread %u received %s",
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pthread_self(), signal == SIGSEGV ? "SIGSEGV" : "SIGILL");
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#endif /* HAVE_BACKTRACE */
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DBG1(DBG_DMN, "killing ourself, received critical signal");
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raise(SIGKILL);
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}
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/**
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* Create the daemon.
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*/
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private_daemon_t *daemon_create(void)
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{
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struct sigaction action;
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private_daemon_t *this = malloc_thing(private_daemon_t);
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/* assign methods */
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this->public.kill = (void (*) (daemon_t*,char*))kill_daemon;
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/* NULL members for clean destruction */
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this->public.socket = NULL;
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this->public.ike_sa_manager = NULL;
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this->public.credentials = NULL;
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this->public.backends = NULL;
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this->public.attributes = NULL;
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this->public.sender= NULL;
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this->public.receiver = NULL;
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this->public.scheduler = NULL;
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this->public.kernel_interface = NULL;
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this->public.processor = NULL;
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this->public.controller = NULL;
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this->public.eap = NULL;
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this->public.plugins = NULL;
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this->public.bus = NULL;
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this->public.outlog = NULL;
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this->public.syslog = NULL;
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this->public.authlog = NULL;
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this->public.uid = 0;
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this->public.gid = 0;
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this->main_thread_id = pthread_self();
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/* add handler for SEGV and ILL,
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* add handler for USR1 (cancellation).
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* INT, TERM and HUP are handled by sigwait() in run() */
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action.sa_handler = segv_handler;
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action.sa_flags = 0;
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sigemptyset(&action.sa_mask);
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sigaddset(&action.sa_mask, SIGINT);
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sigaddset(&action.sa_mask, SIGTERM);
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sigaddset(&action.sa_mask, SIGHUP);
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sigaction(SIGSEGV, &action, NULL);
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sigaction(SIGILL, &action, NULL);
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action.sa_handler = SIG_IGN;
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sigaction(SIGPIPE, &action, NULL);
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pthread_sigmask(SIG_SETMASK, &action.sa_mask, 0);
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return this;
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}
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/**
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* print command line usage and exit
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*/
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static void usage(const char *msg)
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{
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if (msg != NULL && *msg != '\0')
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{
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fprintf(stderr, "%s\n", msg);
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}
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fprintf(stderr, "Usage: charon\n"
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" [--help]\n"
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" [--version]\n"
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" [--use-syslog]\n"
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" [--debug-<type> <level>]\n"
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" <type>: log context type (dmn|mgr|ike|chd|job|cfg|knl|net|enc|lib)\n"
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" <level>: log verbosity (-1 = silent, 0 = audit, 1 = control,\n"
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" 2 = controlmore, 3 = raw, 4 = private)\n"
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"\n"
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);
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exit(msg == NULL? 0 : 1);
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}
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/**
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* Main function, manages the daemon.
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*/
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int main(int argc, char *argv[])
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{
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bool use_syslog = FALSE;
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private_daemon_t *private_charon;
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FILE *pid_file;
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struct stat stb;
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level_t levels[DBG_MAX];
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int signal;
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/* logging for library during initialization, as we have no bus yet */
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dbg = dbg_stderr;
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/* initialize library */
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library_init(STRONGSWAN_CONF);
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lib->plugins->load(lib->plugins, IPSEC_PLUGINDIR, "libstrongswan-");
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lib->printf_hook->add_handler(lib->printf_hook, 'R',
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traffic_selector_get_printf_hooks());
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private_charon = daemon_create();
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|
charon = (daemon_t*)private_charon;
|
|
|
|
lookup_uid_gid(private_charon);
|
|
|
|
/* drop the capabilities we won't need for initialization */
|
|
prctl(PR_SET_KEEPCAPS, 1);
|
|
drop_capabilities(private_charon, FALSE);
|
|
|
|
/* use CTRL loglevel for default */
|
|
for (signal = 0; signal < DBG_MAX; signal++)
|
|
{
|
|
levels[signal] = LEVEL_CTRL;
|
|
}
|
|
|
|
/* handle arguments */
|
|
for (;;)
|
|
{
|
|
struct option long_opts[] = {
|
|
{ "help", no_argument, NULL, 'h' },
|
|
{ "version", no_argument, NULL, 'v' },
|
|
{ "use-syslog", no_argument, NULL, 'l' },
|
|
/* TODO: handle "debug-all" */
|
|
{ "debug-dmn", required_argument, &signal, DBG_DMN },
|
|
{ "debug-mgr", required_argument, &signal, DBG_MGR },
|
|
{ "debug-ike", required_argument, &signal, DBG_IKE },
|
|
{ "debug-chd", required_argument, &signal, DBG_CHD },
|
|
{ "debug-job", required_argument, &signal, DBG_JOB },
|
|
{ "debug-cfg", required_argument, &signal, DBG_CFG },
|
|
{ "debug-knl", required_argument, &signal, DBG_KNL },
|
|
{ "debug-net", required_argument, &signal, DBG_NET },
|
|
{ "debug-enc", required_argument, &signal, DBG_ENC },
|
|
{ "debug-lib", required_argument, &signal, DBG_LIB },
|
|
{ 0,0,0,0 }
|
|
};
|
|
|
|
int c = getopt_long(argc, argv, "", long_opts, NULL);
|
|
switch (c)
|
|
{
|
|
case EOF:
|
|
break;
|
|
case 'h':
|
|
usage(NULL);
|
|
break;
|
|
case 'v':
|
|
printf("Linux strongSwan %s\n", VERSION);
|
|
exit(0);
|
|
case 'l':
|
|
use_syslog = TRUE;
|
|
continue;
|
|
case 0:
|
|
/* option is in signal */
|
|
levels[signal] = atoi(optarg);
|
|
continue;
|
|
default:
|
|
usage("");
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
|
|
/* initialize daemon */
|
|
if (!initialize(private_charon, use_syslog, levels))
|
|
{
|
|
DBG1(DBG_DMN, "initialization failed - aborting charon");
|
|
destroy(private_charon);
|
|
exit(-1);
|
|
}
|
|
|
|
/* check/setup PID file */
|
|
if (stat(PID_FILE, &stb) == 0)
|
|
{
|
|
DBG1(DBG_DMN, "charon already running (\""PID_FILE"\" exists)");
|
|
destroy(private_charon);
|
|
exit(-1);
|
|
}
|
|
pid_file = fopen(PID_FILE, "w");
|
|
if (pid_file)
|
|
{
|
|
fprintf(pid_file, "%d\n", getpid());
|
|
fchown(fileno(pid_file), charon->uid, charon->gid);
|
|
fclose(pid_file);
|
|
}
|
|
|
|
/* drop additional capabilites (bind & root) */
|
|
drop_capabilities(private_charon, TRUE);
|
|
|
|
/* start the engine, go multithreaded */
|
|
charon->processor->set_threads(charon->processor,
|
|
lib->settings->get_int(lib->settings, "charon.threads",
|
|
DEFAULT_THREADS));
|
|
|
|
/* run daemon */
|
|
run(private_charon);
|
|
|
|
/* normal termination, cleanup and exit */
|
|
destroy(private_charon);
|
|
unlink(PID_FILE);
|
|
|
|
library_deinit();
|
|
|
|
return 0;
|
|
}
|
|
|