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
69TCID_DEFINE(setresuid02);
70
71uid_t neg_one = -1;
72
73/* flag to tell parent if child passed or failed. */
74int flag = 0;
75
76uid_t nobody_pw_uid, bin_pw_uid;
77char user1name[] = "nobody";
78char user2name[] = "bin";
79
80struct 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
87struct 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
104int TST_TOTAL = sizeof(test_data) / sizeof(test_data[0]);
105
106void setup(void);
107void cleanup(void);
108
109void
110uid_verify(struct passwd *ru, struct passwd *eu, struct passwd *su, char *);
111
112int 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 */
175void 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 */
208void cleanup(void)
209{
210
211}
212
213void
214uid_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