474 lines
11 KiB
C
474 lines
11 KiB
C
/*
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* Copyright (C) 2006-2017 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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* HSR 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 <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 <sys/utsname.h>
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#include <unistd.h>
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#include <getopt.h>
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#include <fcntl.h>
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#include <errno.h>
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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 <threading/thread.h>
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#ifdef ANDROID
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#include <private/android_filesystem_config.h> /* for AID_VPN */
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#endif
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/**
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* PID file, in which charon stores its process id
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*/
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#define PID_FILE IPSEC_PIDDIR "/charon.pid"
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/**
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* Default user and group
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*/
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#ifndef IPSEC_USER
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#define IPSEC_USER NULL
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#endif
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#ifndef IPSEC_GROUP
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#define IPSEC_GROUP NULL
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#endif
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/**
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* Global reference to PID file (required to truncate, if undeletable)
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*/
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static FILE *pidfile = NULL;
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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) (debug_t group, level_t level, char *fmt, ...);
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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(debug_t group, level_t 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[%N] ", debug_names, group);
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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()
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{
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sigset_t set;
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/* handle SIGINT, SIGHUP and 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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sigprocmask(SIG_BLOCK, &set, NULL);
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while (TRUE)
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{
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int sig;
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sig = sigwaitinfo(&set, NULL);
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if (sig == -1)
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{
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if (errno == EINTR)
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{ /* ignore signals we didn't wait for */
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continue;
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}
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DBG1(DBG_DMN, "waiting for signal failed: %s", strerror(errno));
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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. Reloading "
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"configuration");
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if (lib->settings->load_files(lib->settings, lib->conf, FALSE))
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{
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charon->load_loggers(charon);
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lib->plugins->reload(lib->plugins, NULL);
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}
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else
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{
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DBG1(DBG_DMN, "reloading config failed, keeping old");
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}
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break;
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}
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case SIGINT:
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case SIGTERM:
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{
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DBG1(DBG_DMN, "%s received, shutting down",
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sig == SIGINT ? "SIGINT" : "SIGTERM");
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charon->bus->alert(charon->bus, ALERT_SHUTDOWN_SIGNAL, sig);
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return;
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}
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}
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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 bool lookup_uid_gid()
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{
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char *name;
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name = lib->settings->get_str(lib->settings, "charon.user", IPSEC_USER);
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if (name && !lib->caps->resolve_uid(lib->caps, name))
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{
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return FALSE;
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}
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name = lib->settings->get_str(lib->settings, "charon.group", IPSEC_GROUP);
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if (name && !lib->caps->resolve_gid(lib->caps, name))
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{
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return FALSE;
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}
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#ifdef ANDROID
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lib->caps->set_uid(lib->caps, AID_VPN);
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#endif
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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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#ifndef DISABLE_SIGNAL_HANDLER
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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", thread_current_id(), signal);
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backtrace = backtrace_create(2);
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backtrace->log(backtrace, NULL, TRUE);
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backtrace->log(backtrace, stderr, TRUE);
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backtrace->destroy(backtrace);
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DBG1(DBG_DMN, "killing ourself, received critical signal");
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abort();
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}
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#endif /* DISABLE_SIGNAL_HANDLER */
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/**
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* Check/create PID file, return TRUE if already running
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*/
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static bool check_pidfile()
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{
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struct stat stb;
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if (stat(PID_FILE, &stb) == 0)
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{
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pidfile = fopen(PID_FILE, "r");
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if (pidfile)
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{
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char buf[64];
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pid_t pid = 0;
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memset(buf, 0, sizeof(buf));
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if (fread(buf, 1, sizeof(buf), pidfile))
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{
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buf[sizeof(buf) - 1] = '\0';
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pid = atoi(buf);
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}
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fclose(pidfile);
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pidfile = NULL;
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if (pid && pid != getpid() && kill(pid, 0) == 0)
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{
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DBG1(DBG_DMN, "charon already running ('"PID_FILE"' exists)");
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return TRUE;
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}
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}
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DBG1(DBG_DMN, "removing pidfile '"PID_FILE"', process not running");
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unlink(PID_FILE);
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}
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/* create new pidfile */
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pidfile = fopen(PID_FILE, "w");
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if (pidfile)
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{
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int fd;
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fd = fileno(pidfile);
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if (fd == -1)
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{
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DBG1(DBG_DMN, "unable to determine fd for '"PID_FILE"'");
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return TRUE;
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}
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if (fcntl(fd, F_SETFD, FD_CLOEXEC) == -1)
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{
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DBG1(DBG_LIB, "setting FD_CLOEXEC for '"PID_FILE"' failed: %s",
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strerror(errno));
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}
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/* Only change owner of the pidfile if we have CAP_CHOWN. Otherwise,
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* attempt to change group of pidfile to group under which charon
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* runs after dropping caps. This requires the user that charon
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* starts as to:
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* a) Have write access to the socket dir.
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* b) Belong to the group that charon will run under after dropping
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* caps. */
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if (lib->caps->check(lib->caps, CAP_CHOWN))
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{
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ignore_result(fchown(fd,
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lib->caps->get_uid(lib->caps),
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lib->caps->get_gid(lib->caps)));
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}
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else
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{
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ignore_result(fchown(fd, -1,
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lib->caps->get_gid(lib->caps)));
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}
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fprintf(pidfile, "%d\n", getpid());
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fflush(pidfile);
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return FALSE;
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}
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else
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{
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DBG1(DBG_DMN, "unable to create pidfile '"PID_FILE"'");
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return TRUE;
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}
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}
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/**
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* Delete/truncate the PID file
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*/
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static void unlink_pidfile()
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{
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/* because unlinking the PID file may fail, we truncate it to ensure the
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* daemon can be properly restarted. one probable cause for this is the
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* combination of not running as root and the effective user lacking
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* permissions on the parent dir(s) of the PID file */
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if (pidfile)
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{
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ignore_result(ftruncate(fileno(pidfile), 0));
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fclose(pidfile);
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unlink(PID_FILE);
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}
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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|asn|enc|tnc|imc|imv|pts|tls|esp|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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}
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/**
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* Main function, starts the daemon.
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*/
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int main(int argc, char *argv[])
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{
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struct sigaction action;
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int group, status = SS_RC_INITIALIZATION_FAILED;
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struct utsname utsname;
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level_t levels[DBG_MAX];
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bool use_syslog = FALSE;
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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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if (!library_init(NULL, "charon"))
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{
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library_deinit();
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exit(SS_RC_LIBSTRONGSWAN_INTEGRITY);
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}
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if (lib->integrity &&
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!lib->integrity->check_file(lib->integrity, "charon", argv[0]))
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{
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dbg_stderr(DBG_DMN, 1, "integrity check of charon failed");
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library_deinit();
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exit(SS_RC_DAEMON_INTEGRITY);
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}
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if (!libcharon_init())
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{
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dbg_stderr(DBG_DMN, 1, "initialization failed - aborting charon");
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goto deinit;
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}
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/* use CTRL loglevel for default */
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for (group = 0; group < DBG_MAX; group++)
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{
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levels[group] = LEVEL_CTRL;
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}
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/* handle arguments */
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for (;;)
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{
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struct option long_opts[] = {
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{ "help", no_argument, NULL, 'h' },
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{ "version", no_argument, NULL, 'v' },
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{ "use-syslog", no_argument, NULL, 'l' },
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/* TODO: handle "debug-all" */
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{ "debug-dmn", required_argument, &group, DBG_DMN },
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{ "debug-mgr", required_argument, &group, DBG_MGR },
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{ "debug-ike", required_argument, &group, DBG_IKE },
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{ "debug-chd", required_argument, &group, DBG_CHD },
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{ "debug-job", required_argument, &group, DBG_JOB },
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{ "debug-cfg", required_argument, &group, DBG_CFG },
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{ "debug-knl", required_argument, &group, DBG_KNL },
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{ "debug-net", required_argument, &group, DBG_NET },
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{ "debug-asn", required_argument, &group, DBG_ASN },
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{ "debug-enc", required_argument, &group, DBG_ENC },
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{ "debug-tnc", required_argument, &group, DBG_TNC },
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{ "debug-imc", required_argument, &group, DBG_IMC },
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{ "debug-imv", required_argument, &group, DBG_IMV },
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{ "debug-pts", required_argument, &group, DBG_PTS },
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{ "debug-tls", required_argument, &group, DBG_TLS },
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{ "debug-esp", required_argument, &group, DBG_ESP },
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{ "debug-lib", required_argument, &group, DBG_LIB },
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{ 0,0,0,0 }
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};
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int c = getopt_long(argc, argv, "", long_opts, NULL);
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switch (c)
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{
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case EOF:
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break;
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case 'h':
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usage(NULL);
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status = 0;
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goto deinit;
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case 'v':
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printf("Linux strongSwan %s\n", VERSION);
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status = 0;
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goto deinit;
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case 'l':
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use_syslog = TRUE;
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continue;
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case 0:
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/* option is in group */
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levels[group] = atoi(optarg);
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continue;
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default:
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usage("");
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status = 1;
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goto deinit;
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}
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break;
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}
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if (!lookup_uid_gid())
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{
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dbg_stderr(DBG_DMN, 1, "invalid uid/gid - aborting charon");
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goto deinit;
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}
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charon->set_default_loggers(charon, levels, !use_syslog);
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charon->load_loggers(charon);
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if (uname(&utsname) != 0)
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{
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memset(&utsname, 0, sizeof(utsname));
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}
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DBG1(DBG_DMN, "Starting IKE charon daemon (strongSwan "VERSION", %s %s, %s)",
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utsname.sysname, utsname.release, utsname.machine);
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if (lib->integrity)
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{
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DBG1(DBG_DMN, "integrity tests enabled:");
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DBG1(DBG_DMN, "lib 'libstrongswan': passed file and segment integrity tests");
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DBG1(DBG_DMN, "lib 'libcharon': passed file and segment integrity tests");
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DBG1(DBG_DMN, "daemon 'charon': passed file integrity test");
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}
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/* initialize daemon */
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if (!charon->initialize(charon,
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lib->settings->get_str(lib->settings, "charon.load", PLUGINS)))
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{
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DBG1(DBG_DMN, "initialization failed - aborting charon");
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goto deinit;
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}
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lib->plugins->status(lib->plugins, LEVEL_CTRL);
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if (check_pidfile())
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{
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goto deinit;
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}
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if (!lib->caps->drop(lib->caps))
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{
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DBG1(DBG_DMN, "capability dropping failed - aborting charon");
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goto deinit;
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}
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/* add handler for fatal signals,
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* INT, TERM and HUP are handled by sigwaitinfo() in run() */
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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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/* optionally let the external system handle fatal signals */
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#ifndef DISABLE_SIGNAL_HANDLER
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action.sa_handler = segv_handler;
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sigaction(SIGSEGV, &action, NULL);
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sigaction(SIGILL, &action, NULL);
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sigaction(SIGBUS, &action, NULL);
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#endif /* DISABLE_SIGNAL_HANDLER */
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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, NULL);
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/* start daemon (i.e. the threads in the thread-pool) */
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charon->start(charon);
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/* main thread goes to run loop */
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run();
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status = 0;
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deinit:
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libcharon_deinit();
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unlink_pidfile();
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library_deinit();
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return status;
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}
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