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
202
203
204
205
|
#include <sys/syscall.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include "selinux_internal.h"
#include "policy.h"
static pid_t gettid(void)
{
return syscall(__NR_gettid);
}
static int getprocattrcon_raw(security_context_t * context,
pid_t pid, const char *attr)
{
char *path, *buf;
size_t size;
int fd, rc;
ssize_t ret;
pid_t tid;
int errno_hold;
if (pid > 0)
rc = asprintf(&path, "/proc/%d/attr/%s", pid, attr);
else {
tid = gettid();
rc = asprintf(&path, "/proc/self/task/%d/attr/%s", tid, attr);
}
if (rc < 0)
return -1;
fd = open(path, O_RDONLY);
free(path);
if (fd < 0)
return -1;
size = selinux_page_size;
buf = malloc(size);
if (!buf) {
ret = -1;
goto out;
}
memset(buf, 0, size);
do {
ret = read(fd, buf, size - 1);
} while (ret < 0 && errno == EINTR);
if (ret < 0)
goto out2;
if (ret == 0) {
*context = NULL;
goto out2;
}
*context = strdup(buf);
if (!(*context)) {
ret = -1;
goto out2;
}
ret = 0;
out2:
free(buf);
out:
errno_hold = errno;
close(fd);
errno = errno_hold;
return ret;
}
static int getprocattrcon(security_context_t * context,
pid_t pid, const char *attr)
{
int ret;
security_context_t rcontext;
ret = getprocattrcon_raw(&rcontext, pid, attr);
if (!ret) {
ret = selinux_raw_to_trans_context(rcontext, context);
freecon(rcontext);
}
return ret;
}
static int setprocattrcon_raw(security_context_t context,
pid_t pid, const char *attr)
{
char *path;
int fd, rc;
pid_t tid;
ssize_t ret;
int errno_hold;
if (pid > 0)
rc = asprintf(&path, "/proc/%d/attr/%s", pid, attr);
else {
tid = gettid();
rc = asprintf(&path, "/proc/self/task/%d/attr/%s", tid, attr);
}
if (rc < 0)
return -1;
fd = open(path, O_RDWR);
free(path);
if (fd < 0)
return -1;
if (context)
do {
ret = write(fd, context, strlen(context) + 1);
} while (ret < 0 && errno == EINTR);
else
do {
ret = write(fd, NULL, 0); /* clear */
} while (ret < 0 && errno == EINTR);
errno_hold = errno;
close(fd);
errno = errno_hold;
if (ret < 0)
return -1;
else
return 0;
}
static int setprocattrcon(security_context_t context,
pid_t pid, const char *attr)
{
int ret;
security_context_t rcontext = context;
if (selinux_trans_to_raw_context(context, &rcontext))
return -1;
ret = setprocattrcon_raw(rcontext, pid, attr);
freecon(rcontext);
return ret;
}
#define getselfattr_def(fn, attr) \
int get##fn##_raw(security_context_t *c) \
{ \
return getprocattrcon_raw(c, 0, #attr); \
} \
int get##fn(security_context_t *c) \
{ \
return getprocattrcon(c, 0, #attr); \
}
#define setselfattr_def(fn, attr) \
int set##fn##_raw(security_context_t c) \
{ \
return setprocattrcon_raw(c, 0, #attr); \
} \
int set##fn(security_context_t c) \
{ \
return setprocattrcon(c, 0, #attr); \
}
#define all_selfattr_def(fn, attr) \
getselfattr_def(fn, attr) \
setselfattr_def(fn, attr)
#define getpidattr_def(fn, attr) \
int get##fn##_raw(pid_t pid, security_context_t *c) \
{ \
return getprocattrcon_raw(c, pid, #attr); \
} \
int get##fn(pid_t pid, security_context_t *c) \
{ \
return getprocattrcon(c, pid, #attr); \
}
all_selfattr_def(con, current)
getpidattr_def(pidcon, current)
getselfattr_def(prevcon, prev)
all_selfattr_def(execcon, exec)
all_selfattr_def(fscreatecon, fscreate)
all_selfattr_def(sockcreatecon, sockcreate)
all_selfattr_def(keycreatecon, keycreate)
hidden_def(getcon_raw)
hidden_def(getcon)
hidden_def(getexeccon_raw)
hidden_def(getfilecon_raw)
hidden_def(getfilecon)
hidden_def(getfscreatecon_raw)
hidden_def(getkeycreatecon_raw)
hidden_def(getpeercon_raw)
hidden_def(getpidcon_raw)
hidden_def(getprevcon_raw)
hidden_def(getprevcon)
hidden_def(getsockcreatecon_raw)
hidden_def(setcon_raw)
hidden_def(setexeccon_raw)
hidden_def(setexeccon)
hidden_def(setfilecon_raw)
hidden_def(setfscreatecon_raw)
hidden_def(setkeycreatecon_raw)
hidden_def(setsockcreatecon_raw)
|
