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 * Test Name: chmod05
22 *
23 * Test Description:
24 //wjh
25 //This test seems to be invalid see comments below
26 //The man page for chmod doesn't seem to indicate that the setgid bit can
27 //only be set by root
28 * Verify that, chmod(2) will succeed to change the mode of a directory
29 * but fails to set the setgid bit on it if invoked by non-root (uid != 0)
30 * process with the following constraints,
31 * - the process is the owner of the directory.
32 * - the effective group ID or one of the supplementary group ID's of the
33 * process is not equal to the group ID of the directory.
34 *
35 * Expected Result:
36 * chmod() should return value 0 on success and though succeeds to change
37 * the mode of a directory but fails to set setgid bit on it.
38 *
39 * Algorithm:
40 * Setup:
41 * Setup signal handling.
42 * Create temporary directory.
43 * Pause for SIGUSR1 if option specified.
44 *
45 * Test:
46 * Loop if the proper options are given.
47 * Execute system call
48 * Check return code, if system call failed (return=-1)
49 * Log the errno and Issue a FAIL message.
50 * Otherwise,
51 * Verify the Functionality of system call
52 * if successful,
53 * Issue Functionality-Pass message.
54 * Otherwise,
55 * Issue Functionality-Fail message.
56 * Cleanup:
57 * Print errno log and/or timing stats if options given
58 * Delete the temporary directory created.
59 *
60 * Usage: <for command-line>
61 * chmod05 [-c n] [-e] [-f] [-i n] [-I x] [-P x] [-t]
62 * where, -c n : Run n copies concurrently.
63 * -e : Turn on errno logging.
64 * -f : Turn off functionality Testing.
65 * -i n : Execute test n times.
66 * -I x : Execute test for x seconds.
67 * -P x : Pause for x seconds between iterations.
68 * -t : Turn on syscall timing.
69 *
70 * HISTORY
71 * 07/2001 Ported by Wayne Boyer
72 * 05/2002 Fixes by wjhuie and Ferhan Shareef
73 * changed conditional to check for valid tests only and
74 * in a more logically understandable way
75 * 07/2002 Additional fixes to #defines to allow comparisions to work.
76 * -Robbie Williamson
77 *
78 * RESTRICTIONS:
79 * This test should be run by root.
80 *
81 */
82
83 #ifndef _GNU_SOURCE
84 #define _GNU_SOURCE
85 #endif
86
87 #include <stdio.h>
88 #include <stdlib.h>
89 #include <sys/types.h>
90 #include <sys/stat.h>
91 #include <sys/fcntl.h>
92 #include <errno.h>
93 #include <string.h>
94 #include <signal.h>
95 #include <unistd.h>
96 #include <grp.h>
97 #include <pwd.h>
98
99 #include "test.h"
100
101 #define DEBUG 0
102
103 #define MODE_RWX (mode_t)(S_IRWXU | S_IRWXG | S_IRWXO)
104 #define DIR_MODE (mode_t)(S_ISVTX | S_ISGID | S_IFDIR)
105 #define PERMS (mode_t)(MODE_RWX | DIR_MODE)
106 #define TESTDIR "testdir"
107
108 char *TCID = "chmod05";
109 int TST_TOTAL = 1;
110
111 void setup(); /* Main setup function for test */
112 void cleanup(); /* Main cleanup function for test */
113
main(int ac,char ** av)114 int main(int ac, char **av)
115 {
116 struct stat stat_buf; /* stat struct */
117 int lc;
118 mode_t dir_mode; /* mode permissions set on test directory */
119
120 tst_parse_opts(ac, av, NULL, NULL);
121
122 setup();
123
124 for (lc = 0; TEST_LOOPING(lc); lc++) {
125
126 tst_count = 0;
127
128 TEST(chmod(TESTDIR, PERMS));
129
130 if (TEST_RETURN == -1) {
131 tst_resm(TFAIL, "chmod(%s, %#o) failed",
132 TESTDIR, PERMS);
133 continue;
134 }
135 /*
136 * Get the directory information using
137 * stat(2).
138 */
139 if (stat(TESTDIR, &stat_buf) < 0) {
140 tst_brkm(TFAIL | TERRNO, cleanup,
141 "stat(%s) failed", TESTDIR);
142 }
143 dir_mode = stat_buf.st_mode;
144 #if DEBUG
145 printf("DIR_MODE = 0%03o\n", DIR_MODE);
146 printf("MODE_RWX = 0%03o\n", MODE_RWX);
147 printf("PERMS = 0%03o\n", PERMS);
148 printf("dir_mode = 0%03o\n", dir_mode);
149 #endif
150 if ((PERMS & ~S_ISGID) != dir_mode)
151 tst_resm(TFAIL, "%s: Incorrect modes 0%03o, "
152 "Expected 0%03o", TESTDIR, dir_mode,
153 PERMS & ~S_ISGID);
154 else
155 tst_resm(TPASS,
156 "Functionality of chmod(%s, %#o) successful",
157 TESTDIR, PERMS);
158 }
159
160 cleanup();
161 tst_exit();
162 }
163
164 /*
165 * void
166 * setup() - performs all ONE TIME setup for this test.
167 * Create a temporary directory and cd to it.
168 * Create a test directory under temporary directory.
169 //wjh we are root so do we really need this kluged helper program?
170 * Invoke setuid to root program to modify group ownership
171 * on test directory.
172 */
setup(void)173 void setup(void)
174 {
175 struct passwd *nobody_u;
176 struct group *bin_group;
177
178 tst_require_root();
179
180 TEST_PAUSE;
181
182 tst_tmpdir();
183
184 nobody_u = getpwnam("nobody");
185 if (nobody_u == NULL)
186 tst_brkm(TBROK | TERRNO, cleanup,
187 "getpwnam(\"nobody\") failed");
188 #ifdef ANDROID
189 bin_group = getgrnam("everybody");
190 #else
191 bin_group = getgrnam("bin");
192 #endif
193 if (bin_group == NULL)
194 tst_brkm(TBROK | TERRNO, cleanup, "getgrnam(\"bin\") failed");
195
196 /*
197 * Create a test directory under temporary directory with specified
198 * mode permissions and change the gid of test directory to nobody's
199 * gid.
200 */
201 if (mkdir(TESTDIR, MODE_RWX) < 0)
202 tst_brkm(TBROK | TERRNO, cleanup, "mkdir(%s) failed", TESTDIR);
203
204 if (setgroups(1, &nobody_u->pw_gid) == -1)
205 tst_brkm(TBROK | TERRNO, cleanup,
206 "setgroups to nobody's gid failed");
207
208 if (chown(TESTDIR, nobody_u->pw_uid, bin_group->gr_gid) == -1)
209 tst_brkm(TBROK | TERRNO, cleanup,
210 "chowning testdir to nobody:bin failed");
211
212 /* change to nobody:nobody */
213 if (setegid(nobody_u->pw_gid) == -1 || seteuid(nobody_u->pw_uid) == -1)
214 tst_brkm(TBROK | TERRNO, cleanup,
215 "Couldn't switch to nobody:nobody");
216 }
217
cleanup(void)218 void cleanup(void)
219 {
220 if (setegid(0) == -1)
221 tst_resm(TWARN | TERRNO, "setegid(0) failed");
222 if (seteuid(0) == -1)
223 tst_resm(TWARN | TERRNO, "seteuid(0) failed");
224
225 tst_rmdir();
226 }
227