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 * 	setresuid01.c
23 *
24 * DESCRIPTION
25 * 	Test setresuid() when executed by root.
26 *
27 * ALGORITHM
28 *
29 *	Setup:
30 *	  Setup signal handling
31 *	  Get user information.
32 *	  Pause for SIGUSER1 if option specified.
33 *	Setup test values.
34 *	Loop if the proper options are given.
35 *	For each test execute the system call
36 *	  Check return code, if system call failed (return=-1)
37 *		Log the errno and Issue a FAIL message.
38 *	  Otherwise,
39 *		Verify the Functionality of system call
40 *		if successful,
41 *			Issue Functionality-Pass message.
42 *		Otherwise,
43 *			Issue Functionality-Fail message.
44 *	Cleanup:
45 *	  Print errno log and/or timing stats if options given.
46 *
47 * USAGE:  <for command-line>
48 *	setresuid01 [-c n] [-e] [-f] [-i n] [-I x] [-P x] [-t]
49 *	where,  -c n : Run n copies concurrently.
50 *		-e   : Turn on errno logging.
51 *		-f   : Turn off functionality Testing.
52 *		-i n : Execute test n times.
53 *		-I x : Execute test for x seconds.
54 *		-P x : Pause for x seconds between iterations.
55 *		-t   : Turn on syscall timing.
56 * History
57 *	07/2001 John George
58 *		-Ported
59 *
60 * Restrictions
61 * 	This test must be ran as root.
62 *	nobody and bin must be valid users.
63 */
64
65#define _GNU_SOURCE 1
66#include <pwd.h>
67#include <stdlib.h>
68#include <string.h>
69#include "test.h"
70#include <errno.h>
71#include "compat_16.h"
72
73TCID_DEFINE(setresuid01);
74
75uid_t nobody_pw_uid, root_pw_uid, bin_pw_uid;
76uid_t neg_one = -1;
77
78struct passwd nobody, bin, root;
79
80/*
81 * The following structure contains all test data.  Each structure in the array
82 * is used for a separate test.  The tests are executed in the for loop below.
83 */
84
85struct test_data_t {
86	uid_t *real_uid;
87	uid_t *eff_uid;
88	uid_t *sav_uid;
89	struct passwd *exp_real_usr;
90	struct passwd *exp_eff_usr;
91	struct passwd *exp_sav_usr;
92	char *test_msg;
93} test_data[] = {
94	{
95	&neg_one, &neg_one, &neg_one, &root, &root, &root,
96		    "After setresuid(-1, -1, -1),"}, {
97	&neg_one, &neg_one, &nobody_pw_uid, &root, &root, &nobody,
98		    "After setresuid(-1, -1, nobody),"}, {
99	&neg_one, &bin_pw_uid, &neg_one, &root, &bin, &nobody,
100		    "After setresuid(-1, bin, -1),"}, {
101	&neg_one, &neg_one, &root_pw_uid, &root, &bin, &root,
102		    "After setresuid(-1, -1, root),"}, {
103	&neg_one, &neg_one, &bin_pw_uid, &root, &bin, &bin,
104		    "After setresuid(-1, -1, bin),"}, {
105	&neg_one, &root_pw_uid, &neg_one, &root, &root, &bin,
106		    "After setresuid(-1, root, -1),"}, {
107	&nobody_pw_uid, &neg_one, &neg_one, &nobody, &root, &bin,
108		    "After setresuid(nobody, -1, -1)"}, {
109	&neg_one, &root_pw_uid, &neg_one, &nobody, &root, &bin,
110		    "After setresuid(-1, root, -1),"}, {
111&root_pw_uid, &neg_one, &root_pw_uid, &root, &root, &root,
112		    "After setresuid(root, -1, -1),"},};
113
114int TST_TOTAL = sizeof(test_data) / sizeof(test_data[0]);
115
116void setup(void);
117void cleanup(void);
118
119void
120uid_verify(struct passwd *ru, struct passwd *eu, struct passwd *su, char *when);
121
122int main(int ac, char **av)
123{
124	int lc;
125
126	tst_parse_opts(ac, av, NULL, NULL);
127
128	setup();
129
130	for (lc = 0; TEST_LOOPING(lc); lc++) {
131		int i;
132
133		/* reset tst_count in case we are looping */
134		tst_count = 0;
135
136		for (i = 0; i < TST_TOTAL; i++) {
137			/* Set the real, effective or user id */
138			TEST(SETRESUID(cleanup, *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(TFAIL, "setresuid(%d, %d, %d) failed",
144					 *test_data[i].real_uid,
145					 *test_data[i].eff_uid,
146					 *test_data[i].sav_uid);
147			} else {
148				uid_verify(test_data[i].exp_real_usr,
149					   test_data[i].exp_eff_usr,
150					   test_data[i].exp_sav_usr,
151					   test_data[i].test_msg);
152			}
153		}
154	}
155
156	cleanup();
157	tst_exit();
158}
159
160/*
161 * setup()
162 *	performs all ONE TIME setup for this test
163 */
164void setup(void)
165{
166	tst_require_root();
167
168	tst_sig(FORK, DEF_HANDLER, cleanup);
169
170	if (getpwnam("nobody") == NULL) {
171		tst_brkm(TBROK, NULL, "nobody must be a valid user.");
172	}
173
174	if (getpwnam("bin") == NULL) {
175		tst_brkm(TBROK, NULL, "bin must be a valid user.");
176	}
177
178	root = *(getpwnam("root"));
179	UID16_CHECK((root_pw_uid = root.pw_uid), "setresuid", cleanup)
180
181	nobody = *(getpwnam("nobody"));
182	UID16_CHECK((nobody_pw_uid = nobody.pw_uid), "setresuid", cleanup)
183
184	bin = *(getpwnam("bin"));
185	UID16_CHECK((bin_pw_uid = bin.pw_uid), "setresuid", cleanup)
186
187	/* Pause if that option was specified
188	 * TEST_PAUSE contains the code to fork the test with the -c option.
189	 */
190	TEST_PAUSE;
191}
192
193/*
194 * cleanup()
195 *	performs all ONE TIME cleanup for this test at
196 *	completion or premature exit
197 */
198void cleanup(void)
199{
200
201}
202
203void
204uid_verify(struct passwd *ru, struct passwd *eu, struct passwd *su, char *when)
205{
206	uid_t cur_ru, cur_eu, cur_su;
207	if (getresuid(&cur_ru, &cur_eu, &cur_su) != 0) {
208		tst_brkm(TBROK, cleanup, "Set getresuid() failed");
209	}
210	if ((cur_ru != ru->pw_uid) || (cur_eu != eu->pw_uid) || (cur_su !=
211								 su->pw_uid)) {
212		tst_resm(TFAIL, "ERROR: %s real uid = %d; effective uid = %d; "
213			 "saved uid = %d", when, cur_ru, cur_eu, cur_su);
214		tst_resm(TINFO, "Expected: real uid = %d, effective uid = %d "
215			 "saved uid = %d", ru->pw_uid, eu->pw_uid, su->pw_uid);
216	} else {
217		tst_resm(TPASS,
218			 "real uid = %d, effective uid = %d, and saved uid = "
219			 "%d as expected", cur_ru, cur_eu, cur_su);
220	}
221}
222