1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
|
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/mount.h>
#include <sys/socket.h>
#include <sys/xattr.h>
#include <linux/limits.h>
#include <signal.h>
#include "zdtmtst.h"
/* Enabling the right policy happens in selinux00.hook and selinx00.checkskip */
const char *test_doc = "Check that a SELinux socket context is restored";
const char *test_author = "Adrian Reber <areber@redhat.com>";
/* This is all based on Tycho's apparmor code */
#define CONTEXT "unconfined_u:unconfined_r:unconfined_dbusd_t:s0"
/*
* This is used to store the state of SELinux. For this test
* SELinux is switched to permissive mode and later the previous
* SELinux state is restored.
*/
char state;
int check_for_selinux()
{
if (access("/sys/fs/selinux", F_OK) == 0)
return 0;
return 1;
}
int setprofile()
{
int fd, len;
fd = open("/proc/self/attr/current", O_WRONLY);
if (fd < 0) {
fail("Could not open /proc/self/attr/current\n");
return -1;
}
len = write(fd, CONTEXT, strlen(CONTEXT));
close(fd);
if (len < 0) {
fail("Could not write context\n");
return -1;
}
return 0;
}
int set_sockcreate()
{
int fd, len;
fd = open("/proc/self/attr/sockcreate", O_WRONLY);
if (fd < 0) {
fail("Could not open /proc/self/attr/sockcreate\n");
return -1;
}
len = write(fd, CONTEXT, strlen(CONTEXT));
close(fd);
if (len < 0) {
fail("Could not write context\n");
return -1;
}
return 0;
}
int check_sockcreate()
{
int fd;
char context[1024];
int len;
fd = open("/proc/self/attr/sockcreate", O_RDONLY);
if (fd < 0) {
fail("Could not open /proc/self/attr/sockcreate\n");
return -1;
}
len = read(fd, context, strlen(CONTEXT));
close(fd);
if (len != strlen(CONTEXT)) {
fail("SELinux context has unexpected length %d, expected %zd\n",
len, strlen(CONTEXT));
return -1;
}
if (strncmp(context, CONTEXT, strlen(CONTEXT)) != 0) {
fail("Wrong SELinux context %s expected %s\n", context, CONTEXT);
return -1;
}
return 0;
}
int check_sockcreate_empty()
{
char *output = NULL;
FILE *f = fopen("/proc/self/attr/sockcreate", "r");
int ret = fscanf(f, "%ms", &output);
fclose(f);
if (ret >= 1) {
free(output);
/* sockcreate should be empty, if fscanf found something
* it is wrong.*/
fail("sockcreate should be empty\n");
return -1;
}
if (output) {
free(output);
/* Same here, output should still be NULL. */
fail("sockcreate should be empty\n");
return -1;
}
return 0;
}
int main(int argc, char **argv)
{
int sk;
char ctx[1024];
test_init(argc, argv);
if (check_for_selinux()) {
skip("SELinux not found on this system.");
test_daemon();
test_waitsig();
pass();
return 0;
}
#ifdef USING_SOCKCREATE
if (set_sockcreate())
return -1;
#else
if (check_sockcreate_empty())
return -1;
if (setprofile())
return -1;
if (check_sockcreate_empty())
return -1;
#endif
/* Open our test socket */
sk = socket(AF_INET, SOCK_STREAM, 0);
memset(ctx, 0, 1024);
/* Read out the socket label */
if (fgetxattr(sk, "security.selinux", ctx, 1024) == -1) {
fail("Reading xattr 'security.selinux' failed.\n");
return -1;
}
if (strncmp(ctx, CONTEXT, strlen(CONTEXT)) != 0) {
fail("Wrong SELinux context %s expected %s\n", ctx, CONTEXT);
return -1;
}
memset(ctx, 0, 1024);
test_daemon();
test_waitsig();
/* Read out the socket label again */
if (fgetxattr(sk, "security.selinux", ctx, 1024) == -1) {
fail("Reading xattr 'security.selinux' failed.\n");
return -1;
}
if (strncmp(ctx, CONTEXT, strlen(CONTEXT)) != 0) {
fail("Wrong SELinux context %s expected %s\n", ctx, CONTEXT);
return -1;
}
#ifdef USING_SOCKCREATE
if (check_sockcreate())
return -1;
#else
if (check_sockcreate_empty())
return -1;
#endif
pass();
return 0;
}
|
