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  * DESCRIPTION
22  *	Testcase to check open(2) sets errno to EACCES correctly.
23  *
24  * ALGORITHM
25  *	Create a file owned by root with no read permission for other users.
26  *	Attempt to open it as ltpuser(1). The attempt should fail with EACCES.
27  * RESTRICTION
28  *	Must run test as root.
29  */
30 #include <errno.h>
31 #include <pwd.h>
32 #include <fcntl.h>
33 #include <sys/stat.h>
34 #include <sys/types.h>
35 #include <sys/wait.h>
36 
37 #include "test.h"
38 #include "safe_macros.h"
39 
40 char *TCID = "open05";
41 int TST_TOTAL = 1;
42 
43 static char fname[20];
44 static int fd;
45 
46 static uid_t nobody_uid;
47 
48 static void cleanup(void);
49 static void setup(void);
50 
51 int main(int ac, char **av)
52 {
53 	int lc;
54 	int e_code, status, retval = 0;
55 	pid_t pid;
56 
57 	tst_parse_opts(ac, av, NULL, NULL);
58 
59 	setup();
60 
61 	for (lc = 0; TEST_LOOPING(lc); lc++) {
62 		/* reset tst_count in case we are looping */
63 		tst_count = 0;
64 
65 		pid = FORK_OR_VFORK();
66 		if (pid == -1)
67 			tst_brkm(TBROK, cleanup, "fork() failed");
68 
69 		if (pid == 0) {
70 			if (seteuid(nobody_uid) == -1) {
71 				tst_resm(TWARN, "seteuid() failed, errno: %d",
72 					 errno);
73 			}
74 
75 			TEST(open(fname, O_RDWR));
76 
77 			if (TEST_RETURN != -1) {
78 				tst_resm(TFAIL, "open succeeded unexpectedly");
79 				continue;
80 			}
81 
82 			if (TEST_ERRNO != EACCES) {
83 				retval = 1;
84 				tst_resm(TFAIL, "Expected EACCES got %d",
85 					 TEST_ERRNO);
86 			} else {
87 				tst_resm(TPASS, "open returned expected "
88 					 "EACCES error");
89 			}
90 
91 			/* set the id back to root */
92 			if (seteuid(0) == -1)
93 				tst_resm(TWARN, "seteuid(0) failed");
94 
95 			exit(retval);
96 
97 		} else {
98 			/* wait for the child to finish */
99 			wait(&status);
100 			/* make sure the child returned a good exit status */
101 			e_code = status >> 8;
102 			if ((e_code != 0) || (retval != 0))
103 				tst_resm(TFAIL, "Failures reported above");
104 
105 			close(fd);
106 			cleanup();
107 
108 		}
109 	}
110 
111 	tst_exit();
112 }
113 
114 static void setup(void)
115 {
116 	struct passwd *pw;
117 
118 	tst_require_root();
119 
120 	pw = SAFE_GETPWNAM(NULL, "nobody");
121 	nobody_uid = pw->pw_uid;
122 
123 	tst_sig(FORK, DEF_HANDLER, cleanup);
124 
125 	TEST_PAUSE;
126 
127 	/* make a temporary directory and cd to it */
128 	tst_tmpdir();
129 
130 	sprintf(fname, "file.%d", getpid());
131 
132 	fd = SAFE_OPEN(cleanup, fname, O_RDWR | O_CREAT, 0700);
133 }
134 
135 static void cleanup(void)
136 {
137 	unlink(fname);
138 
139 	/* delete the test directory created in setup() */
140 	tst_rmdir();
141 }
142