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567 lines
14 KiB
567 lines
14 KiB
/*
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* Copyright (C) 2007-2009 Sourcefire, Inc.
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*
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* Authors: Tomasz Kojm
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*/
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#if HAVE_CONFIG_H
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#include "clamav-config.h"
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifndef _WIN32
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#include <sys/time.h>
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#endif
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <time.h>
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#ifdef HAVE_PWD_H
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#include <pwd.h>
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#endif
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#ifdef HAVE_GRP_H
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#include <grp.h>
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#endif
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#include <signal.h>
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#if defined(USE_SYSLOG) && !defined(C_AIX)
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#include <syslog.h>
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#endif
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#ifdef C_LINUX
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#include <sys/resource.h>
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#endif
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#include "target.h"
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#include "libclamav/clamav.h"
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#include "libclamav/others.h"
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#include "libclamav/matcher-ac.h"
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#include "libclamav/readdb.h"
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#include "shared/output.h"
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#include "shared/optparser.h"
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#include "shared/misc.h"
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#include "server.h"
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#include "tcpserver.h"
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#include "localserver.h"
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#include "others.h"
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#include "shared.h"
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short debug_mode = 0, logok = 0;
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short foreground = 0;
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static void help(void)
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{
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printf("\n");
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printf(" Clam AntiVirus Daemon %s\n", get_version());
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printf(" By The ClamAV Team: http://www.clamav.net/team\n");
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printf(" (C) 2007-2009 Sourcefire, Inc.\n\n");
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printf(" --help -h Show this help.\n");
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printf(" --version -V Show version number.\n");
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printf(" --debug Enable debug mode.\n");
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printf(" --config-file=FILE -c FILE Read configuration from FILE.\n\n");
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}
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static struct optstruct *opts;
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/* When running under valgrind and daemonizing, valgrind incorrectly reports
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* leaks from the engine, because it can't see that all the memory is still
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* reachable (some pointers are stored mangled in the JIT).
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* So free the engine on exit from the parent too (during daemonize)
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*/
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static struct cl_engine *gengine = NULL;
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static void free_engine(void)
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{
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if (gengine) {
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cl_engine_free(gengine);
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gengine = NULL;
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}
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}
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int main(int argc, char **argv)
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{
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static struct cl_engine *engine = NULL;
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const struct optstruct *opt;
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#ifndef _WIN32
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struct passwd *user = NULL;
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struct sigaction sa;
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#endif
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time_t currtime;
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const char *dbdir, *cfgfile;
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char *pua_cats = NULL, *pt;
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int ret, tcpsock = 0, localsock = 0, i, min_port, max_port;
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unsigned int sigs = 0;
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int lsockets[2], nlsockets = 0;
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unsigned int dboptions = 0;
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#ifdef C_LINUX
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struct stat sb;
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#endif
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#ifndef _WIN32
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memset(&sa, 0, sizeof(sa));
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sa.sa_handler = SIG_IGN;
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sigaction(SIGHUP, &sa, NULL);
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sigaction(SIGUSR2, &sa, NULL);
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#endif
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if((opts = optparse(NULL, argc, argv, 1, OPT_CLAMD, 0, NULL)) == NULL) {
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mprintf("!Can't parse command line options\n");
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return 1;
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}
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if(optget(opts, "help")->enabled) {
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help();
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optfree(opts);
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return 0;
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}
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if(optget(opts, "debug")->enabled) {
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#if defined(C_LINUX)
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/* njh@bandsman.co.uk: create a dump if needed */
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struct rlimit rlim;
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rlim.rlim_cur = rlim.rlim_max = RLIM_INFINITY;
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if(setrlimit(RLIMIT_CORE, &rlim) < 0)
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perror("setrlimit");
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#endif
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debug_mode = 1;
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}
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/* parse the config file */
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cfgfile = optget(opts, "config-file")->strarg;
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pt = strdup(cfgfile);
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if((opts = optparse(cfgfile, 0, NULL, 1, OPT_CLAMD, 0, opts)) == NULL) {
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fprintf(stderr, "ERROR: Can't open/parse the config file %s\n", pt);
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free(pt);
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return 1;
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}
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free(pt);
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if(optget(opts, "version")->enabled) {
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print_version(optget(opts, "DatabaseDirectory")->strarg);
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optfree(opts);
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return 0;
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}
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/* drop privileges */
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#ifndef _WIN32
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if(geteuid() == 0 && (opt = optget(opts, "User"))->enabled) {
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if((user = getpwnam(opt->strarg)) == NULL) {
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fprintf(stderr, "ERROR: Can't get information about user %s.\n", opt->strarg);
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optfree(opts);
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return 1;
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}
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if(optget(opts, "AllowSupplementaryGroups")->enabled) {
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#ifdef HAVE_INITGROUPS
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if(initgroups(opt->strarg, user->pw_gid)) {
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fprintf(stderr, "ERROR: initgroups() failed.\n");
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optfree(opts);
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return 1;
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}
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#else
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mprintf("!AllowSupplementaryGroups: initgroups() is not available, please disable AllowSupplementaryGroups in %s\n", cfgfile);
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optfree(opts);
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return 1;
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#endif
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} else {
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#ifdef HAVE_SETGROUPS
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if(setgroups(1, &user->pw_gid)) {
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fprintf(stderr, "ERROR: setgroups() failed.\n");
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optfree(opts);
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return 1;
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}
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#endif
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}
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if(setgid(user->pw_gid)) {
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fprintf(stderr, "ERROR: setgid(%d) failed.\n", (int) user->pw_gid);
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optfree(opts);
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return 1;
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}
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if(setuid(user->pw_uid)) {
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fprintf(stderr, "ERROR: setuid(%d) failed.\n", (int) user->pw_uid);
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optfree(opts);
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return 1;
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}
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}
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#endif
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/* initialize logger */
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logg_lock = !optget(opts, "LogFileUnlock")->enabled;
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logg_time = optget(opts, "LogTime")->enabled;
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logok = optget(opts, "LogClean")->enabled;
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logg_size = optget(opts, "LogFileMaxSize")->numarg;
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logg_verbose = mprintf_verbose = optget(opts, "LogVerbose")->enabled;
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mprintf_send_timeout = optget(opts, "SendBufTimeout")->numarg;
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do { /* logger initialized */
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if((opt = optget(opts, "LogFile"))->enabled) {
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char timestr[32];
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logg_file = opt->strarg;
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if(!cli_is_abspath(logg_file)) {
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fprintf(stderr, "ERROR: LogFile requires full path.\n");
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ret = 1;
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break;
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}
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time(&currtime);
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if(logg("#+++ Started at %s", cli_ctime(&currtime, timestr, sizeof(timestr)))) {
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fprintf(stderr, "ERROR: Can't initialize the internal logger\n");
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ret = 1;
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break;
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}
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} else
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logg_file = NULL;
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if((ret = cl_init(CL_INIT_DEFAULT))) {
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logg("!Can't initialize libclamav: %s\n", cl_strerror(ret));
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ret = 1;
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break;
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}
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if(optget(opts, "Debug")->enabled) /* enable debug messages in libclamav */ {
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cl_debug();
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logg_verbose = 2;
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}
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#if defined(USE_SYSLOG) && !defined(C_AIX)
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if(optget(opts, "LogSyslog")->enabled) {
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int fac = LOG_LOCAL6;
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opt = optget(opts, "LogFacility");
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if((fac = logg_facility(opt->strarg)) == -1) {
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logg("!LogFacility: %s: No such facility.\n", opt->strarg);
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ret = 1;
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break;
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}
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openlog("clamd", LOG_PID, fac);
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logg_syslog = 1;
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}
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#endif
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#ifdef C_LINUX
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procdev = 0;
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if(stat("/proc", &sb) != -1 && !sb.st_size)
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procdev = sb.st_dev;
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#endif
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/* check socket type */
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if(optget(opts, "TCPSocket")->enabled)
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tcpsock = 1;
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if(optget(opts, "LocalSocket")->enabled)
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localsock = 1;
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if(!tcpsock && !localsock) {
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logg("!Please define server type (local and/or TCP).\n");
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ret = 1;
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break;
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}
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logg("#clamd daemon %s (OS: "TARGET_OS_TYPE", ARCH: "TARGET_ARCH_TYPE", CPU: "TARGET_CPU_TYPE")\n", get_version());
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#ifndef _WIN32
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if(user)
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logg("#Running as user %s (UID %u, GID %u)\n", user->pw_name, user->pw_uid, user->pw_gid);
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#endif
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if(logg_size)
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logg("#Log file size limited to %d bytes.\n", logg_size);
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else
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logg("#Log file size limit disabled.\n");
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min_port = optget(opts, "StreamMinPort")->numarg;
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max_port = optget(opts, "StreamMaxPort")->numarg;
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if (min_port < 1024 || min_port > max_port || max_port > 65535) {
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logg("!Invalid StreamMinPort/StreamMaxPort: %d, %d\n", min_port, max_port);
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ret = 1;
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break;
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}
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if(!(engine = cl_engine_new())) {
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logg("!Can't initialize antivirus engine\n");
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ret = 1;
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break;
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}
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/* load the database(s) */
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dbdir = optget(opts, "DatabaseDirectory")->strarg;
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logg("#Reading databases from %s\n", dbdir);
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if(optget(opts, "DetectPUA")->enabled) {
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dboptions |= CL_DB_PUA;
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if((opt = optget(opts, "ExcludePUA"))->enabled) {
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dboptions |= CL_DB_PUA_EXCLUDE;
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i = 0;
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logg("#Excluded PUA categories:");
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while(opt) {
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if(!(pua_cats = realloc(pua_cats, i + strlen(opt->strarg) + 3))) {
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logg("!Can't allocate memory for pua_cats\n");
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cl_engine_free(engine);
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ret = 1;
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break;
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}
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logg("# %s", opt->strarg);
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sprintf(pua_cats + i, ".%s", opt->strarg);
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i += strlen(opt->strarg) + 1;
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pua_cats[i] = 0;
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opt = opt->nextarg;
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}
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if (ret)
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break;
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logg("#\n");
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pua_cats[i] = '.';
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pua_cats[i + 1] = 0;
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}
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if((opt = optget(opts, "IncludePUA"))->enabled) {
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if(pua_cats) {
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logg("!ExcludePUA and IncludePUA cannot be used at the same time\n");
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free(pua_cats);
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ret = 1;
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break;
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}
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dboptions |= CL_DB_PUA_INCLUDE;
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i = 0;
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logg("#Included PUA categories:");
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while(opt) {
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if(!(pua_cats = realloc(pua_cats, i + strlen(opt->strarg) + 3))) {
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logg("!Can't allocate memory for pua_cats\n");
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ret = 1;
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break;
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}
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logg("# %s", opt->strarg);
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sprintf(pua_cats + i, ".%s", opt->strarg);
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i += strlen(opt->strarg) + 1;
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pua_cats[i] = 0;
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opt = opt->nextarg;
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}
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if (ret)
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break;
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logg("#\n");
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pua_cats[i] = '.';
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pua_cats[i + 1] = 0;
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}
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if(pua_cats) {
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if((ret = cl_engine_set_str(engine, CL_ENGINE_PUA_CATEGORIES, pua_cats))) {
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logg("!cli_engine_set_str(CL_ENGINE_PUA_CATEGORIES) failed: %s\n", cl_strerror(ret));
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free(pua_cats);
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ret = 1;
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break;
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}
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free(pua_cats);
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}
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} else {
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logg("#Not loading PUA signatures.\n");
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}
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if(optget(opts, "OfficialDatabaseOnly")->enabled) {
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dboptions |= CL_DB_OFFICIAL_ONLY;
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logg("#Only loading official signatures.\n");
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}
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/* set the temporary dir */
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if((opt = optget(opts, "TemporaryDirectory"))->enabled) {
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if((ret = cl_engine_set_str(engine, CL_ENGINE_TMPDIR, opt->strarg))) {
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logg("!cli_engine_set_str(CL_ENGINE_TMPDIR) failed: %s\n", cl_strerror(ret));
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ret = 1;
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break;
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}
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}
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if(optget(opts, "LeaveTemporaryFiles")->enabled)
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cl_engine_set_num(engine, CL_ENGINE_KEEPTMP, 1);
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if(optget(opts, "PhishingSignatures")->enabled)
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dboptions |= CL_DB_PHISHING;
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else
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logg("#Not loading phishing signatures.\n");
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if(optget(opts,"Bytecode")->enabled)
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dboptions |= CL_DB_BYTECODE;
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if((opt = optget(opts,"BytecodeSecurity"))->enabled) {
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enum bytecode_security s;
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if (!strcmp(opt->strarg, "TrustSigned"))
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s = CL_BYTECODE_TRUST_SIGNED;
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else if (!strcmp(opt->strarg, "None"))
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s = CL_BYTECODE_TRUST_ALL;
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else if (!strcmp(opt->strarg, "Paranoid"))
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s = CL_BYTECODE_TRUST_NOTHING;
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else {
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logg("!Unable to parse bytecode security setting:%s\n",
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opt->strarg);
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ret = 1;
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break;
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}
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if ((ret = cl_engine_set_num(engine, CL_ENGINE_BYTECODE_SECURITY, s))) {
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logg("Invalid bytecode security setting %s: %s\n", opt->strarg, cl_strerror(ret));
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ret = 1;
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break;
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}
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}
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if(optget(opts,"PhishingScanURLs")->enabled)
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dboptions |= CL_DB_PHISHING_URLS;
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else
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logg("#Disabling URL based phishing detection.\n");
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if(optget(opts,"DevACOnly")->enabled) {
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logg("#Only using the A-C matcher.\n");
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cl_engine_set_num(engine, CL_ENGINE_AC_ONLY, 1);
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}
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if((opt = optget(opts, "DevACDepth"))->enabled) {
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cl_engine_set_num(engine, CL_ENGINE_AC_MAXDEPTH, opt->numarg);
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logg("#Max A-C depth set to %u\n", (unsigned int) opt->numarg);
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}
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if((ret = cl_load(dbdir, engine, &sigs, dboptions))) {
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logg("!%s\n", cl_strerror(ret));
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ret = 1;
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break;
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}
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logg("#Loaded %u signatures.\n", sigs);
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if((ret = cl_engine_compile(engine)) != 0) {
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logg("!Database initialization error: %s\n", cl_strerror(ret));
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ret = 1;
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break;
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}
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if(tcpsock) {
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if ((lsockets[nlsockets] = tcpserver(opts)) == -1) {
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ret = 1;
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break;
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}
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nlsockets++;
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}
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#ifndef _WIN32
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if(localsock) {
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mode_t sock_mode, umsk = umask(0777); /* socket is created with 000 to avoid races */
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if ((lsockets[nlsockets] = localserver(opts)) == -1) {
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ret = 1;
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umask(umsk);
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break;
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}
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umask(umsk); /* restore umask */
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if(optget(opts, "LocalSocketGroup")->enabled) {
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char *gname = optget(opts, "LocalSocketGroup")->strarg, *end;
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gid_t sock_gid = strtol(gname, &end, 10);
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if(*end) {
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struct group *pgrp = getgrnam(gname);
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if(!pgrp) {
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logg("!Unknown group %s\n", gname);
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ret = 1;
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break;
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}
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sock_gid = pgrp->gr_gid;
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}
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if(chown(optget(opts, "LocalSocket")->strarg, -1, sock_gid)) {
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logg("!Failed to change socket ownership to group %s\n", gname);
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ret = 1;
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break;
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}
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}
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if(optget(opts, "LocalSocketMode")->enabled) {
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char *end;
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sock_mode = strtol(optget(opts, "LocalSocketMode")->strarg, &end, 8);
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if(*end) {
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logg("!Invalid LocalSocketMode %s\n", optget(opts, "LocalSocketMode")->strarg);
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ret = 1;
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break;
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}
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} else
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sock_mode = 0777 /* & ~umsk*/; /* conservative default: umask was 0 in clamd < 0.96 */
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|
|
|
if(chmod(optget(opts, "LocalSocket")->strarg, sock_mode & 0666)) {
|
|
logg("!Cannot set socket permission to %s\n", optget(opts, "LocalSocketMode")->strarg);
|
|
ret = 1;
|
|
break;
|
|
}
|
|
|
|
nlsockets++;
|
|
}
|
|
|
|
/* fork into background */
|
|
if(!optget(opts, "Foreground")->enabled) {
|
|
#ifdef C_BSD
|
|
/* workaround for OpenBSD bug, see https://wwws.clamav.net/bugzilla/show_bug.cgi?id=885 */
|
|
for(ret=0;ret<nlsockets;ret++) {
|
|
fcntl(lsockets[ret], F_SETFL, fcntl(lsockets[ret], F_GETFL) | O_NONBLOCK);
|
|
}
|
|
#endif
|
|
gengine = engine;
|
|
atexit(free_engine);
|
|
if(daemonize() == -1) {
|
|
logg("!daemonize() failed\n");
|
|
ret = 1;
|
|
break;
|
|
}
|
|
gengine = NULL;
|
|
#ifdef C_BSD
|
|
for(ret=0;ret<nlsockets;ret++) {
|
|
fcntl(lsockets[ret], F_SETFL, fcntl(lsockets[ret], F_GETFL) & ~O_NONBLOCK);
|
|
}
|
|
#endif
|
|
if(!debug_mode)
|
|
if(chdir("/") == -1)
|
|
logg("^Can't change current working directory to root\n");
|
|
|
|
} else
|
|
foreground = 1;
|
|
#endif
|
|
|
|
ret = recvloop_th(lsockets, nlsockets, engine, dboptions, opts);
|
|
|
|
} while (0);
|
|
|
|
logg("*Closing the main socket%s.\n", (nlsockets > 1) ? "s" : "");
|
|
|
|
for (i = 0; i < nlsockets; i++) {
|
|
closesocket(lsockets[i]);
|
|
}
|
|
|
|
#ifndef _WIN32
|
|
if(nlsockets && localsock) {
|
|
opt = optget(opts, "LocalSocket");
|
|
if(unlink(opt->strarg) == -1)
|
|
logg("!Can't unlink the socket file %s\n", opt->strarg);
|
|
else
|
|
logg("Socket file removed.\n");
|
|
}
|
|
#endif
|
|
|
|
logg_close();
|
|
optfree(opts);
|
|
|
|
return ret;
|
|
}
|
|
|