1 /*
2 *
3 * Copyright (c) International Business Machines Corp., 2001
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
13 * the GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18 *
19 * Ported by John George
20 */
21
22 /*
23 * Test setreuid() when executed by an unpriviledged user.
24 */
25
26 #include <errno.h>
27 #include <pwd.h>
28 #include <stdlib.h>
29
30 #include "test.h"
31 #include "safe_macros.h"
32 #include "compat_16.h"
33
34 #define FAILED 1
35
36 TCID_DEFINE(setreuid03);
37
38 static int fail = -1;
39 static int pass;
40 static uid_t neg_one = -1;
41
42 static struct passwd nobody, bin, root;
43
44 /*
45 * The following structure contains all test data. Each structure in the array
46 * is used for a separate test. The tests are executed in the for loop below.
47 */
48
49 static struct test_data_t {
50 uid_t *real_uid;
51 uid_t *eff_uid;
52 int *exp_ret;
53 struct passwd *exp_real_usr;
54 struct passwd *exp_eff_usr;
55 char *test_msg;
56 } test_data[] = {
57 {
58 &nobody.pw_uid, &nobody.pw_uid, &pass, &nobody, &nobody,
59 "After setreuid(nobody, nobody),"}, {
60 &neg_one, &nobody.pw_uid, &pass, &nobody, &nobody,
61 "After setreuid(-1, nobody),"}, {
62 &nobody.pw_uid, &neg_one, &pass, &nobody, &nobody,
63 "After setreuid(nobody, -1),"}, {
64 &neg_one, &neg_one, &pass, &nobody, &nobody, "After setreuid(-1, -1),"},
65 {
66 &neg_one, &root.pw_uid, &fail, &nobody, &nobody,
67 "After setreuid(-1, root),"}, {
68 &root.pw_uid, &neg_one, &fail, &nobody, &nobody,
69 "After setreuid(root, -1),"}, {
70 &root.pw_uid, &root.pw_uid, &fail, &nobody, &nobody,
71 "After setreuid(root, root),"}, {
72 &root.pw_uid, &nobody.pw_uid, &fail, &nobody, &nobody,
73 "After setreuid(root, nobody),"}, {
74 &root.pw_uid, &bin.pw_uid, &fail, &nobody, &nobody,
75 "After setreuid(root, nobody),"}, {
76 &bin.pw_uid, &root.pw_uid, &fail, &nobody, &nobody,
77 "After setreuid(bin, root),"}, {
78 &bin.pw_uid, &neg_one, &fail, &nobody, &nobody,
79 "After setreuid(bin, -1),"}, {
80 &bin.pw_uid, &bin.pw_uid, &fail, &nobody, &nobody,
81 "After setreuid(bin, bin,),"}, {
82 &bin.pw_uid, &nobody.pw_uid, &fail, &nobody, &nobody,
83 "After setreuid(bin, nobody),"}, {
84 &nobody.pw_uid, &bin.pw_uid, &fail, &nobody, &nobody,
85 "After setreuid(nobody, bin),"},};
86
87 int TST_TOTAL = ARRAY_SIZE(test_data);
88
89 static void setup(void);
90 static void cleanup(void);
91 static void uid_verify(struct passwd *, struct passwd *, char *);
92
main(int ac,char ** av)93 int main(int ac, char **av)
94 {
95 int lc;
96
97 tst_parse_opts(ac, av, NULL, NULL);
98
99 setup();
100
101 for (lc = 0; TEST_LOOPING(lc); lc++) {
102 int i;
103
104 tst_count = 0;
105
106 for (i = 0; i < TST_TOTAL; i++) {
107
108 /* Set the real or effective user id */
109 TEST(SETREUID(cleanup, *test_data[i].real_uid,
110 *test_data[i].eff_uid));
111
112 if (TEST_RETURN == *test_data[i].exp_ret) {
113 if (TEST_RETURN == neg_one) {
114 if (TEST_ERRNO != EPERM) {
115 tst_resm(TFAIL,
116 "setreuid(%d, %d) "
117 "did not set errno "
118 "value as expected.",
119 *test_data[i].real_uid,
120 *test_data[i].eff_uid);
121 continue;
122 }
123 tst_resm(TPASS, "setreuid(%d, %d) "
124 "failed as expected.",
125 *test_data[i].real_uid,
126 *test_data[i].eff_uid);
127 } else {
128 tst_resm(TPASS, "setreuid(%d, %d) "
129 "succeeded as expected.",
130 *test_data[i].real_uid,
131 *test_data[i].eff_uid);
132 }
133 } else {
134 tst_resm(TFAIL, "setreuid(%d, %d) "
135 "did not return as expected.",
136 *test_data[i].real_uid,
137 *test_data[i].eff_uid);
138 }
139
140 if (TEST_RETURN == -1) {
141 }
142 uid_verify(test_data[i].exp_real_usr,
143 test_data[i].exp_eff_usr,
144 test_data[i].test_msg);
145 }
146 }
147
148 cleanup();
149 tst_exit();
150 }
151
setup(void)152 static void setup(void)
153 {
154 tst_require_root();
155
156 tst_sig(FORK, DEF_HANDLER, cleanup);
157
158 if (getpwnam("nobody") == NULL)
159 tst_brkm(TBROK, NULL, "nobody must be a valid user.");
160
161 if (getpwnam("bin") == NULL)
162 tst_brkm(TBROK, NULL, "bin must be a valid user.");
163
164 root = *(getpwnam("root"));
165 UID16_CHECK(root.pw_uid, setreuid, cleanup);
166
167 nobody = *(getpwnam("nobody"));
168 UID16_CHECK(nobody.pw_uid, setreuid, cleanup);
169
170 bin = *(getpwnam("bin"));
171 UID16_CHECK(bin.pw_uid, setreuid, cleanup);
172
173 SAFE_SETUID(NULL, nobody.pw_uid);
174
175 TEST_PAUSE;
176 }
177
cleanup(void)178 static void cleanup(void)
179 {
180 }
181
uid_verify(struct passwd * ru,struct passwd * eu,char * when)182 static void uid_verify(struct passwd *ru, struct passwd *eu, char *when)
183 {
184 if ((getuid() != ru->pw_uid) || (geteuid() != eu->pw_uid)) {
185 tst_resm(TFAIL, "ERROR: %s real uid = %d; effective uid = %d",
186 when, getuid(), geteuid());
187 tst_resm(TINFO, "Expected: real uid = %d; effective uid = %d",
188 ru->pw_uid, eu->pw_uid);
189 }
190 }
191