12d7249e24
PR: 108523 Submitted by: Dmitri Alenitchev <dmitri@dworlds.ru> (original version) Reviewed by: mpp (first reply to PR)
160 lines
4.0 KiB
C
160 lines
4.0 KiB
C
/*-
|
|
* Copyright (c) 1999 Berkeley Software Design, Inc. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Berkeley Software Design Inc's name may not be used to endorse or
|
|
* promote products derived from this software without specific prior
|
|
* written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN INC ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL BERKELEY SOFTWARE DESIGN INC BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* From BSDI: daemon.c,v 1.2 1996/08/15 01:11:09 jch Exp
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/param.h>
|
|
|
|
#include <err.h>
|
|
#include <errno.h>
|
|
#include <pwd.h>
|
|
#include <grp.h>
|
|
#include <libutil.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
|
|
static void restrict_process(const char *, const char *);
|
|
static void usage(void);
|
|
|
|
int
|
|
main(int argc, char *argv[])
|
|
{
|
|
struct pidfh *pfh;
|
|
int ch, nochdir, noclose, errcode;
|
|
const char *pidfile, *user, *group;
|
|
pid_t otherpid;
|
|
|
|
nochdir = noclose = 1;
|
|
pidfile = user = group = NULL;
|
|
while ((ch = getopt(argc, argv, "-cfg:p:u:")) != -1) {
|
|
switch (ch) {
|
|
case 'c':
|
|
nochdir = 0;
|
|
break;
|
|
case 'f':
|
|
noclose = 0;
|
|
break;
|
|
case 'u':
|
|
user = optarg;
|
|
break;
|
|
case 'g':
|
|
group = optarg;
|
|
break;
|
|
case 'p':
|
|
pidfile = optarg;
|
|
break;
|
|
default:
|
|
usage();
|
|
}
|
|
}
|
|
argc -= optind;
|
|
argv += optind;
|
|
|
|
if (argc == 0)
|
|
usage();
|
|
|
|
if (user || group) {
|
|
if (getuid() != 0)
|
|
errx(1, "only root user is allowed to chroot "
|
|
"and change UID/GID");
|
|
restrict_process(user, group);
|
|
}
|
|
|
|
/*
|
|
* Try to open the pidfile before calling daemon(3),
|
|
* to be able to report the error intelligently
|
|
*/
|
|
if (pidfile) {
|
|
pfh = pidfile_open(pidfile, 0600, &otherpid);
|
|
if (pfh == NULL) {
|
|
if (errno == EEXIST) {
|
|
errx(3, "process already running, pid: %d",
|
|
otherpid);
|
|
}
|
|
err(2, "pidfile ``%s''", pidfile);
|
|
}
|
|
}
|
|
|
|
if (daemon(nochdir, noclose) == -1)
|
|
err(1, NULL);
|
|
|
|
/* Now that we are the child, write out the pid */
|
|
if (pidfile)
|
|
pidfile_write(pfh);
|
|
|
|
execvp(argv[0], argv);
|
|
|
|
/*
|
|
* execvp() failed -- unlink pidfile if any, and
|
|
* report the error
|
|
*/
|
|
errcode = errno; /* Preserve errcode -- unlink may reset it */
|
|
if (pidfile)
|
|
pidfile_remove(pfh);
|
|
|
|
/* The child is now running, so the exit status doesn't matter. */
|
|
errc(1, errcode, "%s", argv[0]);
|
|
}
|
|
|
|
static void
|
|
restrict_process(const char *user, const char *group)
|
|
{
|
|
struct group *gr = NULL;
|
|
struct passwd *pw = NULL;
|
|
errno = 0;
|
|
|
|
if (group != NULL) {
|
|
if (initgroups(user, gr->gr_gid) == -1)
|
|
errx(1, "User not in group list");
|
|
if ((gr = getgrnam(group)) == NULL)
|
|
errx(1, "Group %s does not exist", group);
|
|
if (setgid(gr->gr_gid) == -1)
|
|
err(1, "%s", group);
|
|
}
|
|
|
|
if (user != NULL) {
|
|
if ((pw = getpwnam(user)) == NULL)
|
|
errx(1, "User %s does not exist", user);
|
|
if (setuid(pw->pw_uid) == -1)
|
|
err(1, "%s", user);
|
|
}
|
|
}
|
|
|
|
static void
|
|
usage(void)
|
|
{
|
|
(void)fprintf(stderr,
|
|
"usage: daemon [-cf] [-g group] [-p pidfile] [-u user] command "
|
|
"arguments ...\n");
|
|
exit(1);
|
|
}
|