146 lines
3.1 KiB
C
146 lines
3.1 KiB
C
/*
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* auditd.c: This is a simple audit daemon that throws all messages away.
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*
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* Copyright (C) 2006 Red Hat, Inc. All rights reserved.
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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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, see <http://www.gnu.org/licenses/>.
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*
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* Author(s): Peter Jones <pjones@redhat.com>
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*/
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#define _GNU_SOURCE 1
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#include "config.h"
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#include <sys/types.h>
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#include <sys/syscall.h>
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#include <sys/poll.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <string.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <errno.h>
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#include <libaudit.h>
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#include "auditd.h"
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#ifdef USESELINUX
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static int done;
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static void sig_done(int sig)
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{
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done = 1;
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}
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static void do_auditd(int fd) {
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struct audit_reply rep;
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sigset_t sigs;
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struct sigaction sa;
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struct pollfd pds = {
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.events = POLLIN,
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.revents = 0,
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.fd = fd,
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};
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if (audit_set_pid(fd, getpid(), WAIT_YES) < 0)
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return;
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if (audit_set_enabled(fd, 1) < 0)
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return;
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memset(&sa, '\0', sizeof (sa));
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sa.sa_handler = sig_done;
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sigaction(SIGTERM, &sa, NULL);
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sigaction(SIGINT, &sa, NULL);
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sigaction(SIGHUP, &sa, NULL);
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sigfillset(&sigs);
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sigdelset(&sigs, SIGTERM);
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sigdelset(&sigs, SIGINT);
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sigdelset(&sigs, SIGHUP);
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while (1) {
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int retval;
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memset(&rep, 0, sizeof(rep));
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do {
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retval = ppoll(&pds, 1, NULL, &sigs);
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} while (retval == -1 && errno == EINTR && !done);
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if (done)
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break;
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if (audit_get_reply(fd, &rep, GET_REPLY_NONBLOCKING, 0) > 0) {
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/* we don't actually want to do anything here. */
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;
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}
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}
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return;
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}
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#endif /* USESELINUX */
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int audit_daemonize(void) {
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#ifdef USESELINUX
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int fd;
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pid_t child;
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if ((child = fork()) > 0)
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return 0;
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if (child < 0)
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return -1;
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#ifndef STANDALONE
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for (fd = 0; fd < getdtablesize(); fd++)
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close(fd);
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signal(SIGTTOU, SIG_IGN);
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signal(SIGTTIN, SIG_IGN);
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signal(SIGTSTP, SIG_IGN);
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#endif /* !defined(STANDALONE) */
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if ((fd = open("/proc/self/oom_adj", O_RDWR)) >= 0) {
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write(fd, "-17", 3);
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close(fd);
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}
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fd = audit_open();
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do_auditd(fd);
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audit_close(fd);
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#ifndef STANDALONE
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exit(0);
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#endif /* !defined(STANDALONE) */
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#endif /* USESELINUX */
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return 0;
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}
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#ifdef STANDALONE
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int main(void) {
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if (audit_daemonize() < 0)
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{
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perror("fork");
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return 1;
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}
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return 0;
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}
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#endif /* STANDALONE */
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/*
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* vim:ts=8:sw=4:sts=4:et
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*/
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