xref: /freebsd/tools/regression/priv/priv_vfs_chroot.c (revision 282a3889ebf826db9839be296ff1dd903f6d6d6e)
1 /*-
2  * Copyright (c) 2006 nCircle Network Security, Inc.
3  * All rights reserved.
4  *
5  * This software was developed by Robert N. M. Watson for the TrustedBSD
6  * Project under contract to nCircle Network Security, Inc.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in the
15  *    documentation and/or other materials provided with the distribution.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR, NCIRCLE NETWORK SECURITY,
21  * INC., OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
22  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
23  * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
24  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
25  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
26  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
27  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28  *
29  * $FreeBSD$
30  */
31 
32 /*
33  * Test that chroot() requires privilege; try with, and without.  Do a no-op
34  * chroot() to "/".
35  *
36  * XXXRW: Would also be good to check fchroot() permission, but that is not
37  * exposed via the BSD API.
38  */
39 
40 #include <err.h>
41 #include <errno.h>
42 #include <unistd.h>
43 
44 #include "main.h"
45 
46 void
47 priv_vfs_chroot(void)
48 {
49 	int error;
50 
51 	assert_root();
52 
53 	if (chroot("/") < 0)
54 		err(-1, "chroot(\"/\") as root");
55 
56 	set_euid(UID_OTHER);
57 
58 	error = chroot("/");
59 	if (error == 0)
60 		errx(-1, "chroot(\"/\") succeeded as !root");
61 	if (errno != EPERM)
62 		err(-1, "chroot(\"/\") wrong errno %d as !root", errno);
63 }
64