GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: usr.sbin/chroot/chroot.c Lines: 0 54 0.0 %
Date: 2017-11-13 Branches: 0 53 0.0 %

Line Branch Exec Source
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/*	$OpenBSD: chroot.c,v 1.14 2015/05/19 16:05:12 millert Exp $	*/
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/*
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 * Copyright (c) 1988, 1993
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 *	The Regents of the University of California.  All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
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 *    documentation and/or other materials provided with the distribution.
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 * 3. Neither the name of the University nor the names of its contributors
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 *    may be used to endorse or promote products derived from this software
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 *    without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 * SUCH DAMAGE.
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 */
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#include <sys/types.h>
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <grp.h>
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#include <limits.h>
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#include <login_cap.h>
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#include <paths.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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int		main(int, char **);
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__dead void	usage(void);
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int
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main(int argc, char **argv)
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{
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	struct group	*grp;
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	struct passwd	*pwd;
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	login_cap_t	*lc;
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	const char	*shell;
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	char		*user, *group, *grouplist;
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	gid_t		gidlist[NGROUPS_MAX];
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	int		ch, ngids;
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	int		flags = LOGIN_SETALL & ~(LOGIN_SETLOGIN|LOGIN_SETUSER);
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	lc = NULL;
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	ngids = 0;
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	pwd = NULL;
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	user = grouplist = NULL;
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	while ((ch = getopt(argc, argv, "g:u:")) != -1) {
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		switch(ch) {
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		case 'u':
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			user = optarg;
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			if (*user == '\0')
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				usage();
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			break;
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		case 'g':
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			grouplist = optarg;
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			if (*grouplist == '\0')
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				usage();
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			break;
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		default:
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			usage();
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		}
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	}
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	argc -= optind;
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	argv += optind;
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	if (argc < 1)
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		usage();
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	if (user != NULL) {
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		if ((pwd = getpwnam(user)) == NULL)
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			errx(1, "no such user `%s'", user);
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		if ((lc = login_getclass(pwd->pw_class)) == NULL)
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			err(1, "unable to get login class for `%s'", user);
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	}
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	while ((group = strsep(&grouplist, ",")) != NULL) {
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		if (*group == '\0')
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			continue;
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		if (ngids == NGROUPS_MAX)
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			errx(1, "too many supplementary groups provided");
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		if ((grp = getgrnam(group)) == NULL)
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			errx(1, "no such group `%s'", group);
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		gidlist[ngids++] = grp->gr_gid;
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	}
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	if (ngids != 0) {
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		if (setgid(gidlist[0]) != 0)
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			err(1, "setgid");
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		if (setgroups(ngids, gidlist) != 0)
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			err(1, "setgroups");
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		flags &= ~LOGIN_SETGROUP;
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	}
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	if (lc != NULL) {
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		if (setusercontext(lc, pwd, pwd->pw_uid, flags) == -1)
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			err(1, "setusercontext");
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	}
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	if (chroot(argv[0]) != 0 || chdir("/") != 0)
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		err(1, "%s", argv[0]);
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	if (pwd != NULL) {
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		/* only set login name if we are/can be a session leader */
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		if (getsid(0) == getpid() || setsid() != -1)
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			setlogin(pwd->pw_name);
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		if (setuid(pwd->pw_uid) != 0)
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			err(1, "setuid");
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	}
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	if (argv[1]) {
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		execvp(argv[1], &argv[1]);
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		err(1, "%s", argv[1]);
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	}
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	if ((shell = getenv("SHELL")) == NULL || *shell == '\0')
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		shell = _PATH_BSHELL;
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	execlp(shell, shell, "-i", (char *)NULL);
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	err(1, "%s", shell);
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	/* NOTREACHED */
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}
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__dead void
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usage(void)
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{
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	extern char *__progname;
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	(void)fprintf(stderr, "usage: %s [-g group,group,...] [-u user] "
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	    "newroot [command]\n", __progname);
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	exit(1);
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}