1/*-
2 * Copyright (c) 2006 nCircle Network Security, Inc.
3 * Copyright (c) 2007 Robert N. M. Watson
4 * All rights reserved.
5 *
6 * This software was developed by Robert N. M. Watson for the TrustedBSD
7 * Project under contract to nCircle Network Security, Inc.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR, NCIRCLE NETWORK SECURITY,
22 * INC., OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
24 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
25 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
26 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
27 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
28 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 *
30 * $FreeBSD$
31 */
32
33/*
34 * Test privilege check on /dev/io.  By default, the permissions also protect
35 * against non-superuser access, so this program will modify permissions on
36 * /dev/io to allow world access, and revert the change on exit.  This is not
37 * good for run-time security, but is necessary to test the checks properly.
38 */
39
40#include <sys/types.h>
41#include <sys/stat.h>
42
43#include <err.h>
44#include <errno.h>
45#include <fcntl.h>
46#include <unistd.h>
47
48#include "main.h"
49
50#define	NEW_PERMS	0666
51#define	DEV_IO		"/dev/io"
52#define	EXPECTED_PERMS	0600
53
54static int initialized;
55static mode_t saved_perms;
56
57int
58priv_io_setup(int asroot, int asjail, struct test *test)
59{
60	struct stat sb;
61
62	if (stat(DEV_IO, &sb) < 0) {
63		warn("priv_io_setup: stat(%s)", DEV_IO);
64		return (-1);
65	}
66	saved_perms = sb.st_mode & ALLPERMS;
67	if (saved_perms != EXPECTED_PERMS) {
68		warnx("priv_io_setup: perms = 0%o; expected 0%o",
69		    saved_perms, EXPECTED_PERMS);
70		return (-1);
71	}
72	if (chmod(DEV_IO, NEW_PERMS) < 0) {
73		warn("priv_io_setup: chmod(%s, 0%o)", DEV_IO, NEW_PERMS);
74		return (-1);
75	}
76	initialized = 1;
77	return (0);
78}
79
80void
81priv_io(int asroot, int injail, struct test *test)
82{
83	int error, fd;
84
85	fd = open(DEV_IO, O_RDONLY);
86	if (fd < 0)
87		error = -1;
88	else
89		error = 0;
90	if (asroot && injail)
91		expect("priv_io(asroot, injail)", error, -1, EPERM);
92	if (asroot && !injail)
93		expect("priv_io(asroot, !injail)", error, 0, 0);
94	if (!asroot && injail)
95		expect("priv_io(!asroot, injail)", error, -1, EPERM);
96	if (!asroot && !injail)
97		expect("priv_io(!asroot, !injail)", error, -1, EPERM);
98	if (fd != -1)
99		close(fd);
100}
101
102void
103priv_io_cleanup(int asroot, int asjail, struct test *test)
104{
105
106	if (!initialized)
107		return;
108	if (chmod(DEV_IO, saved_perms) < 0)
109		err(-1, "priv_io_cleanup: chmod(%s, 0%o)", DEV_IO,
110		    saved_perms);
111	initialized = 0;
112}
113