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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 that setregid() fails and sets the proper errno values when a
24  * non-root user attemps to change the real or effective group id to a
25  * value other than the current gid or the current effective gid.
26  */
27 
28 #include <errno.h>
29 #include <pwd.h>
30 #include <grp.h>
31 #include <stdlib.h>
32 #include <string.h>
33 
34 #include "test.h"
35 #include "safe_macros.h"
36 #include "compat_16.h"
37 
38 TCID_DEFINE(setregid02);
39 
40 static gid_t neg_one = -1;
41 
42 static struct passwd *ltpuser;
43 
44 static struct group ltpgroup, root, bin;
45 
46 /*
47  * The following structure contains all test data.  Each structure in the array
48  * is used for a separate test.  The tests are executed in the for loop below.
49  */
50 
51 struct test_data_t {
52 	gid_t *real_gid;
53 	gid_t *eff_gid;
54 	int exp_errno;
55 	struct group *exp_real_usr;
56 	struct group *exp_eff_usr;
57 	char *test_msg;
58 } test_data[] = {
59 	{
60 	&neg_one, &root.gr_gid, EPERM, &ltpgroup, &ltpgroup,
61 		    "After setregid(-1, root),"}, {
62 	&neg_one, &bin.gr_gid, EPERM, &ltpgroup, &ltpgroup,
63 		    "After setregid(-1, bin)"}, {
64 	&root.gr_gid, &neg_one, EPERM, &ltpgroup, &ltpgroup,
65 		    "After setregid(root,-1),"}, {
66 	&bin.gr_gid, &neg_one, EPERM, &ltpgroup, &ltpgroup,
67 		    "After setregid(bin, -1),"}, {
68 	&root.gr_gid, &bin.gr_gid, EPERM, &ltpgroup, &ltpgroup,
69 		    "After setregid(root, bin)"}, {
70 	&bin.gr_gid, &root.gr_gid, EPERM, &ltpgroup, &ltpgroup,
71 		    "After setregid(bin, root),"}
72 };
73 
74 int TST_TOTAL = ARRAY_SIZE(test_data);
75 
76 static void setup(void);
77 static void gid_verify(struct group *ru, struct group *eu, char *when);
78 static struct group get_group_by_name(const char *name);
79 static struct group get_group_by_gid(gid_t gid);
80 
main(int ac,char ** av)81 int main(int ac, char **av)
82 {
83 	int lc;
84 
85 	tst_parse_opts(ac, av, NULL, NULL);
86 
87 	setup();
88 
89 	for (lc = 0; TEST_LOOPING(lc); lc++) {
90 		int i;
91 
92 		tst_count = 0;
93 
94 		for (i = 0; i < TST_TOTAL; i++) {
95 			/* Set the real or effective group id */
96 			TEST(SETREGID(NULL, *test_data[i].real_gid,
97 				      *test_data[i].eff_gid));
98 
99 			if (TEST_RETURN == -1) {
100 				if (TEST_ERRNO == test_data[i].exp_errno) {
101 					tst_resm(TPASS, "setregid(%d, %d) "
102 						 "failed as expected.",
103 						 *test_data[i].real_gid,
104 						 *test_data[i].eff_gid);
105 				} else {
106 					tst_resm(TFAIL, "setregid(%d, %d) "
107 						 "failed (%d) but did not set the "
108 						 "expected errno (%d).",
109 						 *test_data[i].real_gid,
110 						 *test_data[i].eff_gid,
111 						 TEST_ERRNO,
112 						 test_data[i].exp_errno);
113 				}
114 			} else {
115 				tst_resm(TFAIL, "setregid(%d, %d) "
116 					 "did not fail (ret: %ld) as expected (ret: -1).",
117 					 *test_data[i].real_gid,
118 					 *test_data[i].eff_gid, TEST_RETURN);
119 			}
120 			gid_verify(test_data[i].exp_real_usr,
121 				   test_data[i].exp_eff_usr,
122 				   test_data[i].test_msg);
123 		}
124 	}
125 
126 	tst_exit();
127 }
128 
setup(void)129 static void setup(void)
130 {
131 	tst_require_root();
132 
133 	tst_sig(FORK, DEF_HANDLER, NULL);
134 
135 	ltpuser = getpwnam("nobody");
136 	if (ltpuser == NULL)
137 		tst_brkm(TBROK, NULL, "getpwnam(\"nobody\") failed");
138 
139 	SAFE_SETGID(NULL, ltpuser->pw_gid);
140 	SAFE_SETUID(NULL, ltpuser->pw_uid);
141 
142 	root = get_group_by_name("root");
143 	ltpgroup = get_group_by_gid(ltpuser->pw_gid);
144 	bin = get_group_by_name("bin");
145 
146 	TEST_PAUSE;
147 }
148 
get_group_by_name(const char * name)149 static struct group get_group_by_name(const char *name)
150 {
151 	struct group *ret = getgrnam(name);
152 
153 	if (ret == NULL)
154 		tst_brkm(TBROK|TERRNO, NULL, "getgrnam(\"%s\") failed", name);
155 
156 	GID16_CHECK(ret->gr_gid, setregid, NULL);
157 
158 	return *ret;
159 }
160 
get_group_by_gid(gid_t gid)161 static struct group get_group_by_gid(gid_t gid)
162 {
163 	struct group *ret = getgrgid(gid);
164 
165 	if (ret == NULL)
166 		tst_brkm(TBROK|TERRNO, NULL, "getgrgid(\"%d\") failed", gid);
167 
168 	GID16_CHECK(ret->gr_gid, setregid, NULL);
169 
170 	return *ret;
171 }
172 
gid_verify(struct group * rg,struct group * eg,char * when)173 void gid_verify(struct group *rg, struct group *eg, char *when)
174 {
175 	if ((getgid() != rg->gr_gid) || (getegid() != eg->gr_gid)) {
176 		tst_resm(TFAIL, "ERROR: %s real gid = %d; effective gid = %d",
177 			 when, getgid(), getegid());
178 		tst_resm(TINFO, "Expected: real gid = %d; effective gid = %d",
179 			 rg->gr_gid, eg->gr_gid);
180 	} else {
181 		tst_resm(TPASS, "real or effective gid was modified as expected");
182 	}
183 }
184