1 /*-
2 * Copyright (c) 2016 Ed Maste <emaste@FreeBSD.org>
3 * Copyright (c) 2016 Conrad Meyer <cem@FreeBSD.org>
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD: stable/12/tests/sys/vfs/lookup_cap_dotdot.c 312215 2017-01-15 09:13:41Z ngie $");
29
30 #include <sys/param.h>
31 #include <sys/capsicum.h>
32 #include <sys/sysctl.h>
33 #include <sys/stat.h>
34
35 #include <atf-c.h>
36 #include <errno.h>
37 #include <stdlib.h>
38 #include <string.h>
39
40 #include "freebsd_test_suite/macros.h"
41
42 static int dirfd = -1;
43 static char *abspath;
44
45 static void
touchat(int _dirfd,const char * name)46 touchat(int _dirfd, const char *name)
47 {
48 int fd;
49
50 ATF_REQUIRE((fd = openat(_dirfd, name, O_CREAT | O_TRUNC | O_WRONLY,
51 0777)) >= 0);
52 ATF_REQUIRE(close(fd) == 0);
53 }
54
55 static void
prepare_dotdot_tests(void)56 prepare_dotdot_tests(void)
57 {
58 char cwd[MAXPATHLEN];
59
60 ATF_REQUIRE(getcwd(cwd, sizeof(cwd)) != NULL);
61 asprintf(&abspath, "%s/testdir/d1/f1", cwd);
62
63 ATF_REQUIRE(mkdir("testdir", 0777) == 0);
64 ATF_REQUIRE((dirfd = open("testdir", O_RDONLY)) >= 0);
65
66 ATF_REQUIRE(mkdirat(dirfd, "d1", 0777) == 0);
67 ATF_REQUIRE(mkdirat(dirfd, "d1/d2", 0777) == 0);
68 ATF_REQUIRE(mkdirat(dirfd, "d1/d2/d3", 0777) == 0);
69 touchat(dirfd, "d1/f1");
70 touchat(dirfd, "d1/d2/f2");
71 touchat(dirfd, "d1/d2/d3/f3");
72 ATF_REQUIRE(symlinkat("d1/d2/d3", dirfd, "l3") == 0);
73 ATF_REQUIRE(symlinkat("../testdir/d1", dirfd, "lup") == 0);
74 ATF_REQUIRE(symlinkat("../..", dirfd, "d1/d2/d3/ld1") == 0);
75 ATF_REQUIRE(symlinkat("../../f1", dirfd, "d1/d2/d3/lf1") == 0);
76 }
77
78 static void
check_capsicum(void)79 check_capsicum(void)
80 {
81 ATF_REQUIRE_FEATURE("security_capabilities");
82 ATF_REQUIRE_FEATURE("security_capability_mode");
83 }
84
85 /*
86 * Positive tests
87 */
88 ATF_TC(openat__basic_positive);
ATF_TC_HEAD(openat__basic_positive,tc)89 ATF_TC_HEAD(openat__basic_positive, tc)
90 {
91 atf_tc_set_md_var(tc, "descr", "Basic positive openat testcases");
92 }
93
ATF_TC_BODY(openat__basic_positive,tc)94 ATF_TC_BODY(openat__basic_positive, tc)
95 {
96 prepare_dotdot_tests();
97
98 ATF_REQUIRE(openat(dirfd, "d1/d2/d3/f3", O_RDONLY) >= 0);
99 ATF_REQUIRE(openat(dirfd, "d1/d2/d3/../../f1", O_RDONLY) >= 0);
100 ATF_REQUIRE(openat(dirfd, "l3/f3", O_RDONLY) >= 0);
101 ATF_REQUIRE(openat(dirfd, "l3/../../f1", O_RDONLY) >= 0);
102 ATF_REQUIRE(openat(dirfd, "../testdir/d1/f1", O_RDONLY) >= 0);
103 ATF_REQUIRE(openat(dirfd, "lup/f1", O_RDONLY) >= 0);
104 ATF_REQUIRE(openat(dirfd, "l3/ld1", O_RDONLY) >= 0);
105 ATF_REQUIRE(openat(dirfd, "l3/lf1", O_RDONLY) >= 0);
106 ATF_REQUIRE(open(abspath, O_RDONLY) >= 0);
107 ATF_REQUIRE(openat(dirfd, abspath, O_RDONLY) >= 0);
108 }
109
110 ATF_TC(lookup_cap_dotdot__basic);
ATF_TC_HEAD(lookup_cap_dotdot__basic,tc)111 ATF_TC_HEAD(lookup_cap_dotdot__basic, tc)
112 {
113 atf_tc_set_md_var(tc, "descr",
114 "Validate cap-mode (testdir)/d1/.. lookup");
115 }
116
ATF_TC_BODY(lookup_cap_dotdot__basic,tc)117 ATF_TC_BODY(lookup_cap_dotdot__basic, tc)
118 {
119 cap_rights_t rights;
120
121 check_capsicum();
122 prepare_dotdot_tests();
123
124 cap_rights_init(&rights, CAP_LOOKUP, CAP_READ);
125 ATF_REQUIRE(cap_rights_limit(dirfd, &rights) >= 0);
126
127 atf_tc_expect_signal(SIGABRT, "needs change done upstream in atf/kyua according to cem: bug 215690");
128
129 ATF_REQUIRE(cap_enter() >= 0);
130
131 ATF_REQUIRE_MSG(openat(dirfd, "d1/..", O_RDONLY) >= 0, "%s",
132 strerror(errno));
133 }
134
135 ATF_TC(lookup_cap_dotdot__advanced);
ATF_TC_HEAD(lookup_cap_dotdot__advanced,tc)136 ATF_TC_HEAD(lookup_cap_dotdot__advanced, tc)
137 {
138 atf_tc_set_md_var(tc, "descr",
139 "Validate cap-mode (testdir)/d1/.. lookup");
140 }
141
ATF_TC_BODY(lookup_cap_dotdot__advanced,tc)142 ATF_TC_BODY(lookup_cap_dotdot__advanced, tc)
143 {
144 cap_rights_t rights;
145
146 check_capsicum();
147 prepare_dotdot_tests();
148
149 atf_tc_expect_signal(SIGABRT, "needs change done upstream in atf/kyua according to cem: bug 215690");
150
151 cap_rights_init(&rights, CAP_LOOKUP, CAP_READ);
152 ATF_REQUIRE(cap_rights_limit(dirfd, &rights) >= 0);
153
154 ATF_REQUIRE(cap_enter() >= 0);
155
156 ATF_REQUIRE(openat(dirfd, "d1/d2/d3/../../f1", O_RDONLY) >= 0);
157 ATF_REQUIRE(openat(dirfd, "l3/../../f1", O_RDONLY) >= 0);
158 ATF_REQUIRE(openat(dirfd, "l3/ld1", O_RDONLY) >= 0);
159 ATF_REQUIRE(openat(dirfd, "l3/lf1", O_RDONLY) >= 0);
160 }
161
162 /*
163 * Negative tests
164 */
165 ATF_TC(openat__basic_negative);
ATF_TC_HEAD(openat__basic_negative,tc)166 ATF_TC_HEAD(openat__basic_negative, tc)
167 {
168 atf_tc_set_md_var(tc, "descr", "Basic negative openat testcases");
169 }
170
ATF_TC_BODY(openat__basic_negative,tc)171 ATF_TC_BODY(openat__basic_negative, tc)
172 {
173 prepare_dotdot_tests();
174
175 ATF_REQUIRE_ERRNO(ENOENT,
176 openat(dirfd, "does-not-exist", O_RDONLY) < 0);
177 ATF_REQUIRE_ERRNO(ENOENT,
178 openat(dirfd, "l3/does-not-exist", O_RDONLY) < 0);
179 }
180
181 ATF_TC(capmode__negative);
ATF_TC_HEAD(capmode__negative,tc)182 ATF_TC_HEAD(capmode__negative, tc)
183 {
184 atf_tc_set_md_var(tc, "descr", "Negative Capability mode testcases");
185 }
186
ATF_TC_BODY(capmode__negative,tc)187 ATF_TC_BODY(capmode__negative, tc)
188 {
189 int subdirfd;
190
191 check_capsicum();
192 prepare_dotdot_tests();
193
194 atf_tc_expect_signal(SIGABRT, "needs change done upstream in atf/kyua according to cem: bug 215690");
195
196 ATF_REQUIRE(cap_enter() == 0);
197
198 /* open() not permitted in capability mode */
199 ATF_REQUIRE_ERRNO(ECAPMODE, open("testdir", O_RDONLY) < 0);
200
201 /* AT_FDCWD not permitted in capability mode */
202 ATF_REQUIRE_ERRNO(ECAPMODE, openat(AT_FDCWD, "d1/f1", O_RDONLY) < 0);
203
204 /* Relative path above dirfd not capable */
205 ATF_REQUIRE_ERRNO(ENOTCAPABLE, openat(dirfd, "..", O_RDONLY) < 0);
206 ATF_REQUIRE((subdirfd = openat(dirfd, "l3", O_RDONLY)) >= 0);
207 ATF_REQUIRE_ERRNO(ENOTCAPABLE,
208 openat(subdirfd, "../../f1", O_RDONLY) < 0);
209
210 /* Absolute paths not capable */
211 ATF_REQUIRE_ERRNO(ENOTCAPABLE, openat(dirfd, abspath, O_RDONLY) < 0);
212
213 /* Symlink above dirfd */
214 ATF_REQUIRE_ERRNO(ENOTCAPABLE, openat(dirfd, "lup/f1", O_RDONLY) < 0);
215 }
216
217 ATF_TC(lookup_cap_dotdot__negative);
ATF_TC_HEAD(lookup_cap_dotdot__negative,tc)218 ATF_TC_HEAD(lookup_cap_dotdot__negative, tc)
219 {
220 atf_tc_set_md_var(tc, "descr",
221 "Validate cap-mode (testdir)/.. lookup fails");
222 }
223
ATF_TC_BODY(lookup_cap_dotdot__negative,tc)224 ATF_TC_BODY(lookup_cap_dotdot__negative, tc)
225 {
226 cap_rights_t rights;
227
228 check_capsicum();
229 prepare_dotdot_tests();
230
231 cap_rights_init(&rights, CAP_LOOKUP, CAP_READ);
232 ATF_REQUIRE(cap_rights_limit(dirfd, &rights) >= 0);
233
234 atf_tc_expect_signal(SIGABRT, "needs change done upstream in atf/kyua according to cem: bug 215690");
235
236 ATF_REQUIRE(cap_enter() >= 0);
237
238 ATF_REQUIRE_ERRNO(ENOTCAPABLE, openat(dirfd, "..", O_RDONLY) < 0);
239 ATF_REQUIRE_ERRNO(ENOTCAPABLE, openat(dirfd, "d1/../..", O_RDONLY) < 0);
240 ATF_REQUIRE_ERRNO(ENOTCAPABLE, openat(dirfd, "../testdir/d1/f1", O_RDONLY) < 0);
241 }
242
ATF_TP_ADD_TCS(tp)243 ATF_TP_ADD_TCS(tp)
244 {
245
246 ATF_TP_ADD_TC(tp, openat__basic_positive);
247 ATF_TP_ADD_TC(tp, openat__basic_negative);
248
249 ATF_TP_ADD_TC(tp, capmode__negative);
250
251 ATF_TP_ADD_TC(tp, lookup_cap_dotdot__basic);
252 ATF_TP_ADD_TC(tp, lookup_cap_dotdot__advanced);
253 ATF_TP_ADD_TC(tp, lookup_cap_dotdot__negative);
254
255 return (atf_no_error());
256 }
257