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
20 /*
21 * NAME
22 * setresuid02.c
23 *
24 * DESCRIPTION
25 * Test that a non-root user can change the real, effective and saved
26 * uid values through the setresuid system call.
27 *
28 * ALGORITHM
29 *
30 * Setup:
31 * Setup signal handling
32 * Get user information.
33 * Pause for SIGUSER1 if option specified.
34 *
35 * Setup test values.
36 * Loop if the proper options are given.
37 * For each test set execute the system call
38 * Check that we received the expected result.
39 * Verify that the uid, euid and suid values are still correct.
40 * Cleanup:
41 * Print errno log and/or timing stats if option given.
42 *
43 * USAGE: <for command-line>
44 * setresuid02 [-c n] [-f] [-i n] [-I x] [-P x] [-t]
45 * where, -c n : Run n copies concurrently.
46 * -f : Turn off functionality Testing.
47 * -i n : Execute test n times.
48 * -I x : Execute test for x seconds.
49 * -P x : Pause for x seconds between iterations.
50 * -t : Turn on syscall timing.
51 *
52 * History
53 * 07/2001 John George
54 * -Ported
55 *
56 * Restrictions
57 * This test must be run by root.
58 * nobody and bin must be a valid users.
59 */
60
61 #define _GNU_SOURCE 1
62 #include <pwd.h>
63 #include <stdlib.h>
64 #include "test.h"
65 #include <errno.h>
66 #include <sys/wait.h>
67 #include "compat_16.h"
68
69 TCID_DEFINE(setresuid02);
70
71 uid_t neg_one = -1;
72
73 /* flag to tell parent if child passed or failed. */
74 int flag = 0;
75
76 uid_t nobody_pw_uid, bin_pw_uid;
77 char user1name[] = "nobody";
78 char user2name[] = "bin";
79
80 struct passwd nobody, bin;
81
82 /*
83 * The following structure contains all test data. Each structure in the array
84 * is used for a separate test. The tests are executed in the for loop below.
85 */
86
87 struct test_data_t {
88 uid_t *real_uid;
89 uid_t *eff_uid;
90 uid_t *sav_uid;
91 struct passwd *exp_real_usr;
92 struct passwd *exp_eff_usr;
93 struct passwd *exp_sav_usr;
94 char *test_msg;
95 } test_data[] = {
96 {
97 &neg_one, &neg_one, &bin_pw_uid, &nobody, &bin, &bin,
98 "After setresuid(-1, -1, bin),"}, {
99 &neg_one, &nobody_pw_uid, &neg_one, &nobody, &nobody, &bin,
100 "After setresuid(-1, nobody -1),"}, {
101 &bin_pw_uid, &neg_one, &neg_one, &bin, &nobody, &bin,
102 "After setresuid(bin, -1 -1),"},};
103
104 int TST_TOTAL = sizeof(test_data) / sizeof(test_data[0]);
105
106 void setup(void);
107 void cleanup(void);
108
109 void
110 uid_verify(struct passwd *ru, struct passwd *eu, struct passwd *su, char *);
111
main(int ac,char ** av)112 int main(int ac, char **av)
113 {
114 int lc;
115
116 tst_parse_opts(ac, av, NULL, NULL);
117
118 setup();
119
120 for (lc = 0; TEST_LOOPING(lc); lc++) {
121 int i, pid;
122
123 /* reset tst_count in case we are looping */
124 tst_count = 0;
125
126 /* set the appropriate ownership values */
127 if (setresuid(nobody_pw_uid, bin_pw_uid, nobody_pw_uid) == -1) {
128 tst_brkm(TFAIL, cleanup, "Initial setresuid failed");
129 }
130
131 if ((pid = FORK_OR_VFORK()) == -1) {
132 tst_brkm(TBROK, cleanup, "fork failed");
133 } else if (pid == 0) { /* child */
134
135 for (i = 0; i < TST_TOTAL; i++) {
136
137 /* Set the real, effective or saved user id */
138 TEST(SETRESUID(NULL, *test_data[i].real_uid,
139 *test_data[i].eff_uid,
140 *test_data[i].sav_uid));
141
142 if (TEST_RETURN != -1) {
143 tst_resm(TPASS, "setresuid(%d, %d, %d) "
144 "succeeded as expected.",
145 *test_data[i].real_uid,
146 *test_data[i].eff_uid,
147 *test_data[i].sav_uid);
148 } else {
149 tst_resm(TFAIL, "setresuid(%d, %d, %d) "
150 "did not return as expected.",
151 *test_data[i].real_uid,
152 *test_data[i].eff_uid,
153 *test_data[i].sav_uid);
154 flag = -1;
155 }
156
157 uid_verify(test_data[i].exp_real_usr,
158 test_data[i].exp_eff_usr,
159 test_data[i].exp_sav_usr,
160 test_data[i].test_msg);
161 }
162 exit(flag);
163 } else { /* parent */
164 tst_record_childstatus(cleanup, pid);
165 }
166 }
167 cleanup();
168 tst_exit();
169 }
170
171 /*
172 * setup()
173 * performs all ONE TIME setup for this test
174 */
setup(void)175 void setup(void)
176 {
177 tst_require_root();
178
179 tst_sig(FORK, DEF_HANDLER, cleanup);
180
181 if (getpwnam("nobody") == NULL) {
182 tst_brkm(TBROK, NULL, "nobody must be a valid user.");
183 }
184
185 if (getpwnam("bin") == NULL) {
186 tst_brkm(TBROK, NULL, "bin must be a valid user.");
187 }
188
189 nobody = *(getpwnam("nobody"));
190 UID16_CHECK((nobody_pw_uid = nobody.pw_uid), "setresuid", cleanup)
191
192 bin = *(getpwnam("bin"));
193 UID16_CHECK((bin_pw_uid = bin.pw_uid), "setresuid", cleanup)
194
195 /* Pause if that option was specified
196 * TEST_PAUSE contains the code to fork the test with the -i option.
197 * You want to make sure you do this before you create your temporary
198 * directory.
199 */
200 TEST_PAUSE;
201 }
202
203 /*
204 * cleanup()
205 * performs all ONE TIME cleanup for this test at
206 * completion or premature exit
207 */
cleanup(void)208 void cleanup(void)
209 {
210
211 }
212
213 void
uid_verify(struct passwd * ru,struct passwd * eu,struct passwd * su,char * when)214 uid_verify(struct passwd *ru, struct passwd *eu, struct passwd *su, char *when)
215 {
216 uid_t cur_ru, cur_eu, cur_su;
217 if (getresuid(&cur_ru, &cur_eu, &cur_su) != 0) {
218 flag = -1;
219 tst_brkm(TBROK, cleanup, "Set getresuid() failed");
220 }
221 if ((cur_ru != ru->pw_uid) || (cur_eu != eu->pw_uid) || (cur_su !=
222 su->pw_uid)) {
223 tst_resm(TFAIL, "ERROR: %s real uid = %d; effective uid = %d; "
224 "saved uid = %d", when, cur_ru, cur_eu, cur_su);
225 tst_resm(TINFO, "Expected: real uid = %d, effective uid = %d "
226 "saved uid = %d", ru->pw_uid, eu->pw_uid, su->pw_uid);
227 flag = -1;
228 } else {
229 tst_resm(TINFO, "real uid = %d, effective uid = %d, and "
230 "saved uid = %d as expected", cur_ru, cur_eu, cur_su);
231 }
232 }
233