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327 lines
8.2 KiB
327 lines
8.2 KiB
/*
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* Copyright (C)2008 Sourcefire, Inc.
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*
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* Author: aCaB <acab@clamav.net>
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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 <sys/types.h>
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#include <unistd.h>
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#include <pwd.h>
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#include <grp.h>
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#include <string.h>
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#include <syslog.h>
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#include <time.h>
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#include <libmilter/mfapi.h>
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#include "clamav.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 "connpool.h"
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#include "netcode.h"
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#include "clamfi.h"
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#include "whitelist.h"
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struct smfiDesc descr = {
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"ClamAV", /* filter name */
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SMFI_VERSION, /* milter version */
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SMFIF_CHGHDRS|SMFIF_QUARANTINE, /* flags */
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clamfi_connect, /* connection info filter */
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NULL, /* SMTP HELO command filter */
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clamfi_envfrom, /* envelope sender filter */
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clamfi_envrcpt, /* envelope recipient filter */
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clamfi_header, /* header filter */
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NULL, /* end of header */
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clamfi_body, /* body block */
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clamfi_eom, /* end of message */
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clamfi_abort, /* message aborted */
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NULL, /* connection cleanup */
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NULL, /* any unrecognized or unimplemented command filter */
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NULL, /* SMTP DATA command filter */
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NULL /* negotiation callback */
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};
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int main(int argc, char **argv) {
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char *my_socket, *pt;
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const struct optstruct *opt;
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struct optstruct *opts;
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int ret;
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opts = optparse(NULL, argc, argv, 1, OPT_MILTER, 0, NULL);
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if (!opts) {
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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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printf("Usage: %s [-c <config-file>]\n\n", argv[0]);
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printf(" --help -h Show this help\n");
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printf(" --version -V Show version and exit\n");
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printf(" --config-file <file> -c Read configuration from file\n\n");
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optfree(opts);
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return 0;
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}
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if(opts->filename) {
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int x;
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for(x = 0; opts->filename[x]; x++)
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mprintf("^Ignoring option %s\n", opts->filename[x]);
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}
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if(optget(opts, "version")->enabled) {
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printf("clamav-milter %s\n", get_version());
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optfree(opts);
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return 0;
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}
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pt = strdup(optget(opts, "config-file")->strarg);
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if((opts = optparse(pt, 0, NULL, 1, OPT_MILTER, 0, opts)) == NULL) {
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printf("%s: cannot parse config file %s\n", argv[0], 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((opt = optget(opts, "Chroot"))->enabled) {
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if(chdir(opt->strarg) != 0) {
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logg("!Cannot change directory to %s\n", opt->strarg);
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return 1;
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}
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if(chroot(opt->strarg) != 0) {
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logg("!chroot to %s failed. Are you root?\n", opt->strarg);
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return 1;
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}
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}
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if(geteuid() == 0 && (opt = optget(opts, "User"))->enabled) {
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struct passwd *user = NULL;
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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\n");
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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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logg_lock = !optget(opts, "LogFileUnlock")->enabled;
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logg_time = optget(opts, "LogTime")->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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if((opt = optget(opts, "LogFile"))->enabled) {
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time_t currtime;
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logg_file = opt->strarg;
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if(strlen(logg_file) < 2 || logg_file[0] != '/') {
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fprintf(stderr, "ERROR: LogFile requires full path.\n");
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logg_close();
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optfree(opts);
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return 1;
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}
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time(&currtime);
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if(logg("#+++ Started at %s", ctime(&currtime))) {
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fprintf(stderr, "ERROR: Can't initialize the internal logger\n");
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logg_close();
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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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logg_file = NULL;
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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;
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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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logg_close();
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optfree(opts);
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return 1;
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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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if((opt = optget(opts, "TemporaryDirectory"))->enabled)
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tempdir = opt->strarg;
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if(localnets_init(opts) || init_actions(opts)) {
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logg_close();
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optfree(opts);
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return 1;
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}
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if((opt = optget(opts, "Whitelist"))->enabled && whitelist_init(opt->strarg)) {
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localnets_free();
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logg_close();
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optfree(opts);
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return 1;
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}
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if(optget(opts, "AddHeader")->enabled) {
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char myname[255];
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if(!gethostname(myname, sizeof(myname))) {
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myname[sizeof(myname)-1] = '\0';
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snprintf(xvirushdr, sizeof(xvirushdr), "clamav-milter %s at %s", get_version(), myname);
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xvirushdr[sizeof(xvirushdr)-1] = '\0';
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} else {
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snprintf(xvirushdr, sizeof(xvirushdr), "clamav-milter %s", get_version());
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xvirushdr[sizeof(xvirushdr)-1] = '\0';
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}
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addxvirus = 1;
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}
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if(!(my_socket = optget(opts, "MilterSocket")->strarg)) {
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logg("!Please configure the MilterSocket directive\n");
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localnets_free();
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whitelist_free();
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logg_close();
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optfree(opts);
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return 1;
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}
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if(!optget(opts, "Foreground")->enabled) {
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if(daemonize() == -1) {
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logg("!daemonize() failed\n");
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localnets_free();
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whitelist_free();
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cpool_free();
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logg_close();
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optfree(opts);
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return 1;
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}
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if(chdir("/") == -1)
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logg("^Can't change current working directory to root\n");
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}
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if(smfi_setconn(my_socket) == MI_FAILURE) {
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logg("!smfi_setconn failed\n");
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localnets_free();
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whitelist_free();
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logg_close();
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optfree(opts);
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return 1;
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}
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if(smfi_register(descr) == MI_FAILURE) {
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logg("!smfi_register failed\n");
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localnets_free();
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whitelist_free();
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logg_close();
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optfree(opts);
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return 1;
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}
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opt = optget(opts, "FixStaleSocket");
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if(smfi_opensocket(opt->enabled) == MI_FAILURE) {
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logg("!Failed to create socket %s\n", my_socket);
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localnets_free();
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whitelist_free();
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logg_close();
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optfree(opts);
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return 1;
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}
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maxfilesize = optget(opts, "MaxFileSize")->numarg;
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readtimeout = optget(opts, "ReadTimeout")->numarg;
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cpool_init(opts);
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if (!cp) {
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logg("!Failed to init the socket pool\n");
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localnets_free();
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whitelist_free();
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logg_close();
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optfree(opts);
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return 1;
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}
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if((opt = optget(opts, "PidFile"))->enabled) {
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FILE *fd;
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mode_t old_umask = umask(0006);
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if((fd = fopen(opt->strarg, "w")) == NULL) {
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logg("!Can't save PID in file %s\n", opt->strarg);
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} else {
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if (fprintf(fd, "%u", (unsigned int)getpid())<0) {
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logg("!Can't save PID in file %s\n", opt->strarg);
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}
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fclose(fd);
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}
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umask(old_umask);
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}
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ret = smfi_main();
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optfree(opts);
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logg_close();
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cpool_free();
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localnets_free();
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whitelist_free();
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return ret;
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}
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/*
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* Local Variables:
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* mode: c
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* c-basic-offset: 4
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* tab-width: 8
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* End:
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* vim: set cindent smartindent autoindent softtabstop=4 shiftwidth=4 tabstop=8:
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*/
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