2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1988, 1993
5 * The Regents of the University of California. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 static const char copyright[] =
35 "@(#) Copyright (c) 1988, 1993\n\
36 The Regents of the University of California. All rights reserved.\n";
40 static char sccsid[] = "@(#)chroot.c 8.1 (Berkeley) 6/9/93";
43 #include <sys/cdefs.h>
44 __FBSDID("$FreeBSD$");
46 #include <sys/types.h>
47 #include <sys/procctl.h>
61 static void usage(void);
64 main(int argc, char *argv[])
68 char *endp, *p, *user, *group, *grouplist;
72 int arg, ch, error, gids;
78 user = group = grouplist = NULL;
79 nonprivileged = false;
80 while ((ch = getopt(argc, argv, "G:g:u:n")) != -1) {
94 if (*grouplist == '\0')
112 if (isdigit((unsigned char)*group)) {
113 gid = (gid_t)strtoul(group, &endp, 0);
118 if ((gp = getgrnam(group)) != NULL)
121 errx(1, "no such group `%s'", group);
125 ngroups_max = sysconf(_SC_NGROUPS_MAX) + 1;
126 if ((gidlist = malloc(sizeof(gid_t) * ngroups_max)) == NULL)
129 (p = strsep(&grouplist, ",")) != NULL && gids < ngroups_max; ) {
133 if (isdigit((unsigned char)*p)) {
134 gidlist[gids] = (gid_t)strtoul(p, &endp, 0);
139 if ((gp = getgrnam(p)) != NULL)
140 gidlist[gids] = gp->gr_gid;
142 errx(1, "no such group `%s'", p);
146 if (p != NULL && gids == ngroups_max)
147 errx(1, "too many supplementary groups provided");
150 if (isdigit((unsigned char)*user)) {
151 uid = (uid_t)strtoul(user, &endp, 0);
156 if ((pw = getpwnam(user)) != NULL)
159 errx(1, "no such user `%s'", user);
164 arg = PROC_NO_NEW_PRIVS_ENABLE;
165 error = procctl(P_PID, getpid(), PROC_NO_NEW_PRIVS_CTL, &arg);
170 if (chdir(argv[0]) == -1 || chroot(".") == -1)
171 err(1, "%s", argv[0]);
173 if (gids && setgroups(gids, gidlist) == -1)
175 if (group && setgid(gid) == -1)
177 if (user && setuid(uid) == -1)
181 execvp(argv[1], &argv[1]);
182 err(1, "%s", argv[1]);
185 if (!(shell = getenv("SHELL")))
186 shell = _PATH_BSHELL;
187 execlp(shell, shell, "-i", (char *)NULL);
195 (void)fprintf(stderr, "usage: chroot [-g group] [-G group,group,...] "
196 "[-u user] [-n] newroot [command]\n");