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
|
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2013 Intel Corporation
Author: Auke Kok <auke-jan.h.kok@intel.com>
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <sys/xattr.h>
#include "util.h"
#include "path-util.h"
#include "smack-util.h"
bool mac_smack_use(void) {
#ifdef HAVE_SMACK
static int cached_use = -1;
if (cached_use < 0)
cached_use = access("/sys/fs/smackfs/", F_OK) >= 0;
return cached_use;
#else
return false;
#endif
}
int mac_smack_apply(const char *path, const char *label) {
#ifdef HAVE_SMACK
if (!mac_smack_use())
return 0;
if (label)
return setxattr(path, "security.SMACK64", label, strlen(label), 0);
else
return lremovexattr(path, "security.SMACK64");
#else
return 0;
#endif
}
int mac_smack_apply_fd(int fd, const char *label) {
#ifdef HAVE_SMACK
if (!mac_smack_use())
return 0;
return fsetxattr(fd, "security.SMACK64", label, strlen(label), 0);
#else
return 0;
#endif
}
int mac_smack_apply_ip_out_fd(int fd, const char *label) {
#ifdef HAVE_SMACK
if (!mac_smack_use())
return 0;
return fsetxattr(fd, "security.SMACK64IPOUT", label, strlen(label), 0);
#else
return 0;
#endif
}
int mac_smack_apply_ip_in_fd(int fd, const char *label) {
#ifdef HAVE_SMACK
if (!mac_smack_use())
return 0;
return fsetxattr(fd, "security.SMACK64IPIN", label, strlen(label), 0);
#else
return 0;
#endif
}
int mac_smack_fix(const char *path) {
int r = 0;
#ifdef HAVE_SMACK
struct stat sb;
const char *label;
/*
* Path must be in /dev and must exist
*/
if (!path_startswith(path, "/dev"))
return 0;
r = lstat(path, &sb);
if (r < 0)
return -errno;
/*
* Label directories and character devices "*".
* Label symlinks "_".
* Don't change anything else.
*/
if (S_ISDIR(sb.st_mode))
label = SMACK_STAR_LABEL;
else if (S_ISLNK(sb.st_mode))
label = SMACK_FLOOR_LABEL;
else if (S_ISCHR(sb.st_mode))
label = SMACK_STAR_LABEL;
else
return 0;
r = setxattr(path, "security.SMACK64", label, strlen(label), 0);
if (r < 0) {
log_error("Smack relabeling \"%s\" %m", path);
return -errno;
}
#endif
return r;
}
|
