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Commit	Line	Data
44bd5ea7 A	1	/*
	2	* Copyright (c) 1988, 1993
	3	* The Regents of the University of California. All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
	13	* 3. All advertising materials mentioning features or use of this software
	14	* must display the following acknowledgement:
	15	* This product includes software developed by the University of
	16	* California, Berkeley and its contributors.
	17	* 4. Neither the name of the University nor the names of its contributors
	18	* may be used to endorse or promote products derived from this software
	19	* without specific prior written permission.
	20	*
	21	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	22	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	23	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	24	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	25	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	26	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	27	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	28	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	29	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	30	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	31	* SUCH DAMAGE.
	32	*/
	33
	34	#include <sys/cdefs.h>
	35	#ifndef lint
	36	__COPYRIGHT("@(#) Copyright (c) 1988, 1993\n\
	37	The Regents of the University of California. All rights reserved.\n");
	38	#endif /* not lint */
	39
	40	#ifndef lint
	41	#if 0
	42	static char sccsid[] = "@(#)chroot.c 8.1 (Berkeley) 6/9/93";
	43	#else
	44	__RCSID("$NetBSD: chroot.c,v 1.7 1998/10/06 03:47:51 mrg Exp $");
	45	#endif
	46	#endif /* not lint */
	47
	48	#include <sys/param.h>
	49
	50	#include <ctype.h>
	51	#include <err.h>
	52	#include <errno.h>
	53	#include <grp.h>
	54	#include <paths.h>
	55	#include <pwd.h>
	56	#include <stdio.h>
	57	#include <stdlib.h>
	58	#include <string.h>
	59	#include <unistd.h>
	60
	61	int main __P((int, char **));
	62	void usage __P((void)) __attribute__((__noreturn__));
	63
	64	char user; / user to switch to before running program */
65	char group; / group to switch to ... */
66	char grouplist; / group list to switch to ... */
67
68	int
69	main(argc, argv)
70	int argc;
71	char *argv[];
72	{
73	struct group *gp;
74	struct passwd *pw;
75	char shell, endp, *comma;
76	gid_t gid = 0, gidlist[NGROUPS_MAX];
77	uid_t uid = 0;
78	int ch, gids;
79
80	while ((ch = getopt(argc, argv, "G:g:u:")) != -1)
81	switch(ch) {
82	case 'u':
83	user = optarg;
84	break;
85	case 'g':
86	group = optarg;
87	break;
88	case 'G':
89	grouplist = optarg;
90	break;
91	case '?':
92	default:
93	usage();
94	}
95	argc -= optind;
96	argv += optind;
97
98	if (argc < 1)
99	usage();
100
101	if (group) {
102	if (isdigit(*group)) {
103	gid = (gid_t)strtol(group, &endp, 0);
104	if (endp == group)
105	goto getgroup;
106	} else {
107	getgroup:
108	if ((gp = getgrnam(group)))
109	gid = gp->gr_gid;
110	else
111	errx(1, "no such group %s", group);
112	}
113	}
114
115	for (gids = 0; grouplist; ) {
116	comma = strchr(grouplist, ',');
117
118	if (comma)
119	*comma++ = '\0';
120
121	if (isdigit(*grouplist)) {
122	gidlist[gids] = (gid_t)strtol(grouplist, &endp, 0);
123	if (endp == grouplist)
124	goto getglist;
125	} else {
126	getglist:
127	if ((gp = getgrnam(grouplist)))
128	gidlist[gids] = gp->gr_gid;
129	else
130	errx(1, "no such group %s", group);
131	}
132	gids++;
133	grouplist = comma;
134	}
135
136	if (user) {
137	if (isdigit(*user)) {
138	uid = (uid_t)strtol(user, &endp, 0);
139	if (endp == user)
140	goto getuser;
141	} else {
142	getuser:
143	if ((pw = getpwnam(user)))
144	uid = pw->pw_uid;
145	else
146	errx(1, "no such user %s", user);
147	}
148	}
149
150	if (chdir(argv[0]) \|\| chroot("."))
151	err(1, "%s", argv[0]);
152
153	if (gids && setgroups(gids, gidlist) < 0)
154	err(1, "setgroups");
155	if (group && setgid(gid) < 0)
156	err(1, "setgid");
157	if (user && setuid(uid) < 0)
158	err(1, "setuid");
159
160	if (argv[1]) {
161	execvp(argv[1], &argv[1]);
162	err(1, "%s", argv[1]);
163	}
164
165	if (!(shell = getenv("SHELL")))
166	shell = _PATH_BSHELL;
167	execlp(shell, shell, "-i", NULL);
168	err(1, "%s", shell);
169	/* NOTREACHED */
170	}
171
172	void
173	usage()
174	{
175	(void)fprintf(stderr, "usage: chroot [-g group] [-G group,group,...] "
176	"[-u user] newroot [command]\n");
177	exit(1);
178	}