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
31 /*
32 * Test privilege check on /dev/io. By default, the permissions also protect
33 * against non-superuser access, so this program will modify permissions on
34 * /dev/io to allow world access, and revert the change on exit. This is not
35 * good for run-time security, but is necessary to test the checks properly.
36 */
37
38 #include <sys/types.h>
39 #include <sys/stat.h>
40
41 #include <err.h>
42 #include <errno.h>
43 #include <fcntl.h>
44 #include <unistd.h>
45
46 #include "main.h"
47
48 #define NEW_PERMS 0666
49 #define DEV_IO "/dev/io"
50 #define EXPECTED_PERMS 0600
51
52 static int initialized;
53 static mode_t saved_perms;
54
55 int
priv_io_setup(int asroot,int asjail,struct test * test)56 priv_io_setup(int asroot, int asjail, struct test *test)
57 {
58 struct stat sb;
59
60 if (stat(DEV_IO, &sb) < 0) {
61 warn("priv_io_setup: stat(%s)", DEV_IO);
62 return (-1);
63 }
64 saved_perms = sb.st_mode & ALLPERMS;
65 if (saved_perms != EXPECTED_PERMS) {
66 warnx("priv_io_setup: perms = 0%o; expected 0%o",
67 saved_perms, EXPECTED_PERMS);
68 return (-1);
69 }
70 if (chmod(DEV_IO, NEW_PERMS) < 0) {
71 warn("priv_io_setup: chmod(%s, 0%o)", DEV_IO, NEW_PERMS);
72 return (-1);
73 }
74 initialized = 1;
75 return (0);
76 }
77
78 void
priv_io(int asroot,int injail,struct test * test)79 priv_io(int asroot, int injail, struct test *test)
80 {
81 int error, fd;
82
83 fd = open(DEV_IO, O_RDONLY);
84 if (fd < 0)
85 error = -1;
86 else
87 error = 0;
88 if (asroot && injail)
89 expect("priv_io(asroot, injail)", error, -1, EPERM);
90 if (asroot && !injail)
91 expect("priv_io(asroot, !injail)", error, 0, 0);
92 if (!asroot && injail)
93 expect("priv_io(!asroot, injail)", error, -1, EPERM);
94 if (!asroot && !injail)
95 expect("priv_io(!asroot, !injail)", error, -1, EPERM);
96 if (fd != -1)
97 close(fd);
98 }
99
100 void
priv_io_cleanup(int asroot,int asjail,struct test * test)101 priv_io_cleanup(int asroot, int asjail, struct test *test)
102 {
103
104 if (!initialized)
105 return;
106 if (chmod(DEV_IO, saved_perms) < 0)
107 err(-1, "priv_io_cleanup: chmod(%s, 0%o)", DEV_IO,
108 saved_perms);
109 initialized = 0;
110 }
111