775 lines
19 KiB
C
775 lines
19 KiB
C
/*
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* Copyright (C) 2006-2009 Tobias Brunner
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* Copyright (C) 2005-2009 Martin Willi
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* Copyright (C) 2006 Daniel Roethlisberger
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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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#ifdef HAVE_PRCTL
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#include <sys/prctl.h>
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#endif
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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 CAPABILITIES
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#include <sys/capability.h>
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#endif /* CAPABILITIES */
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#include "daemon.h"
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#include <library.h>
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#include <utils/backtrace.h>
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#include <config/traffic_selector.h>
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#include <config/proposal.h>
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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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#ifdef CAPABILITIES
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/**
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* capabilities to keep
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*/
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cap_t caps;
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#endif /* CAPABILITIES */
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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->vlog(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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/* unload plugins to release threads */
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lib->plugins->unload(lib->plugins);
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#ifdef CAPABILITIES
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cap_free(this->caps);
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#endif /* CAPABILITIES */
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DESTROY_IF(this->public.traps);
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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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DESTROY_IF(this->public.sim);
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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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this->public.file_loggers->destroy_offset(this->public.file_loggers,
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offsetof(file_logger_t, destroy));
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this->public.sys_loggers->destroy_offset(this->public.sys_loggers,
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offsetof(sys_logger_t, destroy));
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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->public.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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pthread_kill(this->public.main_thread_id, 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)
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{
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#ifdef HAVE_PRCTL
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prctl(PR_SET_KEEPCAPS, 1);
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#endif
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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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#ifdef CAPABILITIES
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if (cap_set_proc(this->caps) != 0)
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{
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kill_daemon(this, "unable to drop daemon capabilities");
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}
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#endif /* CAPABILITIES */
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}
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/**
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* Implementation of daemon_t.keep_cap
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*/
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static void keep_cap(private_daemon_t *this, u_int cap)
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{
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#ifdef CAPABILITIES
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cap_set_flag(this->caps, CAP_EFFECTIVE, 1, &cap, CAP_SET);
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cap_set_flag(this->caps, CAP_INHERITABLE, 1, &cap, CAP_SET);
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cap_set_flag(this->caps, CAP_PERMITTED, 1, &cap, CAP_SET);
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#endif /* CAPABILITIES */
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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, "resolving 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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* Log loaded plugins
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*/
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static void print_plugins()
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{
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char buf[512], *plugin;
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int len = 0;
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enumerator_t *enumerator;
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buf[0] = '\0';
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enumerator = lib->plugins->create_plugin_enumerator(lib->plugins);
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while (len < sizeof(buf) && enumerator->enumerate(enumerator, &plugin))
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{
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len += snprintf(&buf[len], sizeof(buf)-len, "%s ", plugin);
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}
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enumerator->destroy(enumerator);
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DBG1(DBG_DMN, "loaded plugins: %s", buf);
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}
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/**
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* Initialize logging
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*/
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static void initialize_loggers(private_daemon_t *this, bool use_stderr,
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level_t levels[])
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{
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sys_logger_t *sys_logger;
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file_logger_t *file_logger;
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enumerator_t *enumerator;
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char *facility, *filename;
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int loggers_defined = 0;
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debug_t group;
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level_t def;
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bool append;
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FILE *file;
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/* setup sysloggers */
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enumerator = lib->settings->create_section_enumerator(lib->settings,
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"charon.syslog");
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while (enumerator->enumerate(enumerator, &facility))
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{
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loggers_defined++;
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if (streq(facility, "daemon"))
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{
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sys_logger = sys_logger_create(LOG_DAEMON);
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}
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else if (streq(facility, "auth"))
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{
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sys_logger = sys_logger_create(LOG_AUTHPRIV);
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}
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else
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{
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continue;
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}
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def = lib->settings->get_int(lib->settings,
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"charon.syslog.%s.default", 1, facility);
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for (group = 0; group < DBG_MAX; group++)
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{
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sys_logger->set_level(sys_logger, group,
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lib->settings->get_int(lib->settings,
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"charon.syslog.%s.%N", def,
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facility, debug_lower_names, group));
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}
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this->public.sys_loggers->insert_last(this->public.sys_loggers,
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sys_logger);
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this->public.bus->add_listener(this->public.bus, &sys_logger->listener);
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}
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enumerator->destroy(enumerator);
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/* and file loggers */
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enumerator = lib->settings->create_section_enumerator(lib->settings,
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"charon.filelog");
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while (enumerator->enumerate(enumerator, &filename))
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{
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loggers_defined++;
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if (streq(filename, "stderr"))
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{
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file = stderr;
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}
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else if (streq(filename, "stdout"))
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{
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file = stdout;
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}
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else
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{
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append = lib->settings->get_bool(lib->settings,
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"charon.filelog.%s.append", TRUE, filename);
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file = fopen(filename, append ? "a" : "w");
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if (file == NULL)
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{
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DBG1(DBG_DMN, "opening file %s for logging failed: %s",
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filename, strerror(errno));
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continue;
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}
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}
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file_logger = file_logger_create(file);
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def = lib->settings->get_int(lib->settings,
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"charon.filelog.%s.default", 1, filename);
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for (group = 0; group < DBG_MAX; group++)
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{
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file_logger->set_level(file_logger, group,
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lib->settings->get_int(lib->settings,
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"charon.filelog.%s.%N", def,
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filename, debug_lower_names, group));
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}
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this->public.file_loggers->insert_last(this->public.file_loggers,
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file_logger);
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this->public.bus->add_listener(this->public.bus, &file_logger->listener);
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}
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enumerator->destroy(enumerator);
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/* set up legacy style default loggers provided via command-line */
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if (!loggers_defined)
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{
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/* set up default stdout file_logger */
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file_logger = file_logger_create(stdout);
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this->public.bus->add_listener(this->public.bus, &file_logger->listener);
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this->public.file_loggers->insert_last(this->public.file_loggers,
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file_logger);
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/* set up default daemon sys_logger */
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sys_logger = sys_logger_create(LOG_DAEMON);
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this->public.bus->add_listener(this->public.bus, &sys_logger->listener);
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this->public.sys_loggers->insert_last(this->public.sys_loggers,
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sys_logger);
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for (group = 0; group < DBG_MAX; group++)
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{
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sys_logger->set_level(sys_logger, group, levels[group]);
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if (use_stderr)
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{
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file_logger->set_level(file_logger, group, levels[group]);
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}
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}
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/* set up default auth sys_logger */
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sys_logger = sys_logger_create(LOG_AUTHPRIV);
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this->public.bus->add_listener(this->public.bus, &sys_logger->listener);
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this->public.sys_loggers->insert_last(this->public.sys_loggers,
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sys_logger);
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sys_logger->set_level(sys_logger, DBG_ANY, LEVEL_AUDIT);
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}
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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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/* 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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/* set up hook to log dbg message in library via charons message bus */
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dbg = dbg_bus;
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initialize_loggers(this, !syslog, levels);
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DBG1(DBG_DMN, "Starting IKEv2 charon daemon (strongSwan "VERSION")");
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/* load secrets, ca certificates and crls */
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this->public.processor = processor_create();
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this->public.scheduler = scheduler_create();
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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.sim = sim_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.kernel_interface = kernel_interface_create();
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this->public.socket = socket_create();
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this->public.traps = trap_manager_create();
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/* load plugins, further infrastructure may need it */
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lib->plugins->load(lib->plugins, IPSEC_PLUGINDIR,
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lib->settings->get_str(lib->settings, "charon.load", PLUGINS));
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print_plugins();
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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.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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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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backtrace_t *backtrace;
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DBG1(DBG_DMN, "thread %u received %d", pthread_self(), signal);
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backtrace = backtrace_create(2);
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backtrace->log(backtrace, stderr);
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backtrace->destroy(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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this->public.keep_cap = (void(*)(daemon_t*, u_int cap))keep_cap;
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/* NULL members for clean destruction */
|
|
this->public.socket = NULL;
|
|
this->public.ike_sa_manager = NULL;
|
|
this->public.traps = NULL;
|
|
this->public.credentials = NULL;
|
|
this->public.backends = NULL;
|
|
this->public.attributes = NULL;
|
|
this->public.sender= NULL;
|
|
this->public.receiver = NULL;
|
|
this->public.scheduler = NULL;
|
|
this->public.kernel_interface = NULL;
|
|
this->public.processor = NULL;
|
|
this->public.controller = NULL;
|
|
this->public.eap = NULL;
|
|
this->public.sim = NULL;
|
|
this->public.bus = NULL;
|
|
this->public.file_loggers = linked_list_create();
|
|
this->public.sys_loggers = linked_list_create();
|
|
#ifdef ME
|
|
this->public.connect_manager = NULL;
|
|
this->public.mediation_manager = NULL;
|
|
#endif /* ME */
|
|
this->public.uid = 0;
|
|
this->public.gid = 0;
|
|
|
|
this->public.main_thread_id = pthread_self();
|
|
#ifdef CAPABILITIES
|
|
this->caps = cap_init();
|
|
keep_cap(this, CAP_NET_ADMIN);
|
|
if (lib->leak_detective)
|
|
{
|
|
keep_cap(this, CAP_SYS_NICE);
|
|
}
|
|
#endif /* CAPABILITIES */
|
|
|
|
/* add handler for SEGV and ILL,
|
|
* add handler for USR1 (cancellation).
|
|
* INT, TERM and HUP are handled by sigwait() in run() */
|
|
action.sa_handler = segv_handler;
|
|
action.sa_flags = 0;
|
|
sigemptyset(&action.sa_mask);
|
|
sigaddset(&action.sa_mask, SIGINT);
|
|
sigaddset(&action.sa_mask, SIGTERM);
|
|
sigaddset(&action.sa_mask, SIGHUP);
|
|
sigaction(SIGSEGV, &action, NULL);
|
|
sigaction(SIGILL, &action, NULL);
|
|
sigaction(SIGBUS, &action, NULL);
|
|
action.sa_handler = SIG_IGN;
|
|
sigaction(SIGPIPE, &action, NULL);
|
|
|
|
pthread_sigmask(SIG_SETMASK, &action.sa_mask, 0);
|
|
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* Check/create PID file, return TRUE if already running
|
|
*/
|
|
static bool check_pidfile()
|
|
{
|
|
struct stat stb;
|
|
FILE *file;
|
|
|
|
if (stat(PID_FILE, &stb) == 0)
|
|
{
|
|
file = fopen(PID_FILE, "r");
|
|
if (file)
|
|
{
|
|
char buf[64];
|
|
pid_t pid = 0;
|
|
|
|
memset(buf, 0, sizeof(buf));
|
|
if (fread(buf, 1, sizeof(buf), file))
|
|
{
|
|
pid = atoi(buf);
|
|
}
|
|
fclose(file);
|
|
if (pid && kill(pid, 0) == 0)
|
|
{ /* such a process is running */
|
|
return TRUE;
|
|
}
|
|
}
|
|
DBG1(DBG_DMN, "removing pidfile '"PID_FILE"', process not running");
|
|
unlink(PID_FILE);
|
|
}
|
|
|
|
/* create new pidfile */
|
|
file = fopen(PID_FILE, "w");
|
|
if (file)
|
|
{
|
|
fprintf(file, "%d\n", getpid());
|
|
ignore_result(fchown(fileno(file), charon->uid, charon->gid));
|
|
fclose(file);
|
|
}
|
|
return FALSE;
|
|
}
|
|
|
|
/**
|
|
* print command line usage and exit
|
|
*/
|
|
static void usage(const char *msg)
|
|
{
|
|
if (msg != NULL && *msg != '\0')
|
|
{
|
|
fprintf(stderr, "%s\n", msg);
|
|
}
|
|
fprintf(stderr, "Usage: charon\n"
|
|
" [--help]\n"
|
|
" [--version]\n"
|
|
" [--use-syslog]\n"
|
|
" [--debug-<type> <level>]\n"
|
|
" <type>: log context type (dmn|mgr|ike|chd|job|cfg|knl|net|enc|lib)\n"
|
|
" <level>: log verbosity (-1 = silent, 0 = audit, 1 = control,\n"
|
|
" 2 = controlmore, 3 = raw, 4 = private)\n"
|
|
"\n"
|
|
);
|
|
exit(msg == NULL? 0 : 1);
|
|
}
|
|
|
|
/**
|
|
* Main function, manages the daemon.
|
|
*/
|
|
int main(int argc, char *argv[])
|
|
{
|
|
bool use_syslog = FALSE;
|
|
private_daemon_t *private_charon;
|
|
level_t levels[DBG_MAX];
|
|
int group;
|
|
|
|
/* logging for library during initialization, as we have no bus yet */
|
|
dbg = dbg_stderr;
|
|
|
|
/* initialize library */
|
|
if (!library_init(STRONGSWAN_CONF))
|
|
{
|
|
exit(-1);
|
|
}
|
|
lib->printf_hook->add_handler(lib->printf_hook, 'R',
|
|
traffic_selector_printf_hook,
|
|
PRINTF_HOOK_ARGTYPE_POINTER,
|
|
PRINTF_HOOK_ARGTYPE_END);
|
|
lib->printf_hook->add_handler(lib->printf_hook, 'P',
|
|
proposal_printf_hook,
|
|
PRINTF_HOOK_ARGTYPE_POINTER,
|
|
PRINTF_HOOK_ARGTYPE_END);
|
|
private_charon = daemon_create();
|
|
charon = (daemon_t*)private_charon;
|
|
|
|
lookup_uid_gid(private_charon);
|
|
|
|
/* use CTRL loglevel for default */
|
|
for (group = 0; group < DBG_MAX; group++)
|
|
{
|
|
levels[group] = 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, &group, DBG_DMN },
|
|
{ "debug-mgr", required_argument, &group, DBG_MGR },
|
|
{ "debug-ike", required_argument, &group, DBG_IKE },
|
|
{ "debug-chd", required_argument, &group, DBG_CHD },
|
|
{ "debug-job", required_argument, &group, DBG_JOB },
|
|
{ "debug-cfg", required_argument, &group, DBG_CFG },
|
|
{ "debug-knl", required_argument, &group, DBG_KNL },
|
|
{ "debug-net", required_argument, &group, DBG_NET },
|
|
{ "debug-enc", required_argument, &group, DBG_ENC },
|
|
{ "debug-lib", required_argument, &group, 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 group */
|
|
levels[group] = 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);
|
|
}
|
|
|
|
if (check_pidfile())
|
|
{
|
|
DBG1(DBG_DMN, "charon already running (\""PID_FILE"\" exists)");
|
|
destroy(private_charon);
|
|
exit(-1);
|
|
}
|
|
|
|
/* drop the capabilities we won't need */
|
|
drop_capabilities(private_charon);
|
|
|
|
/* 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;
|
|
}
|
|
|