1 /* $NetBSD: t_chroot.c,v 1.2 2017/01/10 22:36:29 christos Exp $ */
2
3 /*-
4 * Copyright (c) 2011 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Jukka Ruohonen.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31 #include <sys/cdefs.h>
32 __RCSID("$NetBSD: t_chroot.c,v 1.2 2017/01/10 22:36:29 christos Exp $");
33
34 #include <sys/wait.h>
35 #include <sys/stat.h>
36
37 #include <atf-c.h>
38 #include <errno.h>
39 #include <fcntl.h>
40 #include <limits.h>
41 #include <pwd.h>
42 #include <stdlib.h>
43 #include <string.h>
44 #include <unistd.h>
45
46 ATF_TC(chroot_basic);
ATF_TC_HEAD(chroot_basic,tc)47 ATF_TC_HEAD(chroot_basic, tc)
48 {
49 atf_tc_set_md_var(tc, "descr", "A basic test of chroot(2)");
50 atf_tc_set_md_var(tc, "require.user", "root");
51 }
52
ATF_TC_BODY(chroot_basic,tc)53 ATF_TC_BODY(chroot_basic, tc)
54 {
55 char buf[PATH_MAX];
56 int fd, sta;
57 pid_t pid;
58
59 (void)memset(buf, '\0', sizeof(buf));
60 (void)getcwd(buf, sizeof(buf));
61 (void)strlcat(buf, "/dir", sizeof(buf));
62
63 ATF_REQUIRE(mkdir(buf, 0500) == 0);
64 ATF_REQUIRE(chdir(buf) == 0);
65
66 pid = fork();
67 ATF_REQUIRE(pid >= 0);
68
69 if (pid == 0) {
70
71 if (chroot(buf) != 0)
72 _exit(EXIT_FAILURE);
73
74 errno = 0;
75
76 if (chroot("/root") != -1)
77 _exit(EXIT_FAILURE);
78
79 if (errno != ENOENT)
80 _exit(EXIT_FAILURE);
81
82 fd = open("file", O_RDONLY | O_CREAT, 0600);
83
84 if (fd < 0)
85 _exit(EXIT_FAILURE);
86
87 if (close(fd) != 0)
88 _exit(EXIT_FAILURE);
89
90 _exit(EXIT_SUCCESS);
91 }
92
93 (void)wait(&sta);
94
95 if (WIFEXITED(sta) == 0 || WEXITSTATUS(sta) != EXIT_SUCCESS)
96 atf_tc_fail("chroot(2) failed");
97
98 (void)chdir("/");
99 (void)strlcat(buf, "/file", sizeof(buf));
100
101 fd = open(buf, O_RDONLY);
102
103 if (fd < 0)
104 atf_tc_fail("chroot(2) did not change the root directory");
105
106 ATF_REQUIRE(close(fd) == 0);
107 ATF_REQUIRE(unlink(buf) == 0);
108 }
109
110 ATF_TC(chroot_err);
ATF_TC_HEAD(chroot_err,tc)111 ATF_TC_HEAD(chroot_err, tc)
112 {
113 atf_tc_set_md_var(tc, "descr", "Test error conditions of chroot(2)");
114 atf_tc_set_md_var(tc, "require.user", "root");
115 }
116
ATF_TC_BODY(chroot_err,tc)117 ATF_TC_BODY(chroot_err, tc)
118 {
119 char buf[PATH_MAX + 1];
120
121 (void)memset(buf, 'x', sizeof(buf));
122
123 errno = 0;
124 ATF_REQUIRE_ERRNO(ENAMETOOLONG, chroot(buf) == -1);
125
126 errno = 0;
127 ATF_REQUIRE_ERRNO(EFAULT, chroot((void *)-1) == -1);
128
129 errno = 0;
130 ATF_REQUIRE_ERRNO(ENOENT, chroot("/a/b/c/d/e/f/g/h/i/j") == -1);
131 }
132
133 ATF_TC(chroot_perm);
ATF_TC_HEAD(chroot_perm,tc)134 ATF_TC_HEAD(chroot_perm, tc)
135 {
136 atf_tc_set_md_var(tc, "descr", "Test permissions with chroot(2)");
137 atf_tc_set_md_var(tc, "require.user", "unprivileged");
138 }
139
ATF_TC_BODY(chroot_perm,tc)140 ATF_TC_BODY(chroot_perm, tc)
141 {
142 static char buf[LINE_MAX];
143 pid_t pid;
144 int sta;
145
146 (void)memset(buf, '\0', sizeof(buf));
147 ATF_REQUIRE(getcwd(buf, sizeof(buf)) != NULL);
148
149 pid = fork();
150 ATF_REQUIRE(pid >= 0);
151
152 if (pid == 0) {
153
154 errno = 0;
155
156 if (chroot(buf) != -1)
157 _exit(EXIT_FAILURE);
158
159 if (errno != EPERM)
160 _exit(EXIT_FAILURE);
161
162 _exit(EXIT_SUCCESS);
163 }
164
165 (void)wait(&sta);
166
167 if (WIFEXITED(sta) == 0 || WEXITSTATUS(sta) != EXIT_SUCCESS)
168 atf_tc_fail("chroot(2) succeeded as unprivileged user");
169 }
170
171 #ifdef __NetBSD__
172 ATF_TC(fchroot_basic);
ATF_TC_HEAD(fchroot_basic,tc)173 ATF_TC_HEAD(fchroot_basic, tc)
174 {
175 atf_tc_set_md_var(tc, "descr", "A basic test of fchroot(2)");
176 atf_tc_set_md_var(tc, "require.user", "root");
177 }
178
ATF_TC_BODY(fchroot_basic,tc)179 ATF_TC_BODY(fchroot_basic, tc)
180 {
181 char buf[PATH_MAX];
182 int fd, sta;
183 pid_t pid;
184
185 (void)memset(buf, '\0', sizeof(buf));
186 (void)getcwd(buf, sizeof(buf));
187 (void)strlcat(buf, "/dir", sizeof(buf));
188
189 ATF_REQUIRE(mkdir(buf, 0500) == 0);
190 ATF_REQUIRE(chdir(buf) == 0);
191
192 fd = open(buf, O_RDONLY);
193 ATF_REQUIRE(fd >= 0);
194
195 pid = fork();
196 ATF_REQUIRE(pid >= 0);
197
198 if (pid == 0) {
199
200 if (fchroot(fd) != 0)
201 _exit(EXIT_FAILURE);
202
203 if (close(fd) != 0)
204 _exit(EXIT_FAILURE);
205
206 fd = open("file", O_RDONLY | O_CREAT, 0600);
207
208 if (fd < 0)
209 _exit(EXIT_FAILURE);
210
211 if (close(fd) != 0)
212 _exit(EXIT_FAILURE);
213
214 _exit(EXIT_SUCCESS);
215 }
216
217 (void)wait(&sta);
218
219 if (WIFEXITED(sta) == 0 || WEXITSTATUS(sta) != EXIT_SUCCESS)
220 atf_tc_fail("fchroot(2) failed");
221
222 (void)chdir("/");
223 (void)strlcat(buf, "/file", sizeof(buf));
224
225 fd = open(buf, O_RDONLY);
226
227 if (fd < 0)
228 atf_tc_fail("fchroot(2) did not change the root directory");
229
230 ATF_REQUIRE(close(fd) == 0);
231 ATF_REQUIRE(unlink(buf) == 0);
232 }
233
234 ATF_TC(fchroot_err);
ATF_TC_HEAD(fchroot_err,tc)235 ATF_TC_HEAD(fchroot_err, tc)
236 {
237 atf_tc_set_md_var(tc, "descr", "Test error conditions of fchroot(2)");
238 atf_tc_set_md_var(tc, "require.user", "root");
239 }
240
ATF_TC_BODY(fchroot_err,tc)241 ATF_TC_BODY(fchroot_err, tc)
242 {
243 int fd;
244
245 fd = open("/etc/passwd", O_RDONLY);
246 ATF_REQUIRE(fd >= 0);
247
248 errno = 0;
249 ATF_REQUIRE_ERRNO(EBADF, fchroot(-1) == -1);
250
251 errno = 0;
252 ATF_REQUIRE_ERRNO(ENOTDIR, fchroot(fd) == -1);
253
254 ATF_REQUIRE(close(fd) == 0);
255 }
256
257 ATF_TC(fchroot_perm);
ATF_TC_HEAD(fchroot_perm,tc)258 ATF_TC_HEAD(fchroot_perm, tc)
259 {
260 atf_tc_set_md_var(tc, "descr", "Test permissions with fchroot(2)");
261 atf_tc_set_md_var(tc, "require.user", "root");
262 }
263
ATF_TC_BODY(fchroot_perm,tc)264 ATF_TC_BODY(fchroot_perm, tc)
265 {
266 static char buf[LINE_MAX];
267 struct passwd *pw;
268 int fd, sta;
269 pid_t pid;
270
271 (void)memset(buf, '\0', sizeof(buf));
272 ATF_REQUIRE(getcwd(buf, sizeof(buf)) != NULL);
273
274 pw = getpwnam("nobody");
275 fd = open(buf, O_RDONLY);
276
277 ATF_REQUIRE(fd >= 0);
278 ATF_REQUIRE(pw != NULL);
279
280 pid = fork();
281 ATF_REQUIRE(pid >= 0);
282
283 if (pid == 0) {
284
285 (void)setuid(pw->pw_uid);
286
287 errno = 0;
288
289 if (fchroot(fd) != -1)
290 _exit(EXIT_FAILURE);
291
292 if (errno != EPERM)
293 _exit(EXIT_FAILURE);
294
295 _exit(EXIT_SUCCESS);
296 }
297
298 (void)wait(&sta);
299
300 if (WIFEXITED(sta) == 0 || WEXITSTATUS(sta) != EXIT_SUCCESS)
301 atf_tc_fail("fchroot(2) succeeded as unprivileged user");
302 }
303 #endif
304
ATF_TP_ADD_TCS(tp)305 ATF_TP_ADD_TCS(tp)
306 {
307
308 ATF_TP_ADD_TC(tp, chroot_basic);
309 ATF_TP_ADD_TC(tp, chroot_err);
310 ATF_TP_ADD_TC(tp, chroot_perm);
311 #ifdef __NetBSD__
312 ATF_TP_ADD_TC(tp, fchroot_basic);
313 ATF_TP_ADD_TC(tp, fchroot_err);
314 ATF_TP_ADD_TC(tp, fchroot_perm);
315 #endif
316
317 return atf_no_error();
318 }
319