2 This file is part of systemd.
4 Copyright 2013 Intel Corporation
6 Author: Auke Kok <auke-jan.h.kok@intel.com>
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
25 #include <sys/xattr.h>
28 #include "alloc-util.h"
32 #include "path-util.h"
33 #include "process-util.h"
34 #include "smack-util.h"
35 #include "string-table.h"
36 #include "xattr-util.h"
39 bool mac_smack_use(void) {
40 static int cached_use = -1;
43 cached_use = access("/sys/fs/smackfs/", F_OK) >= 0;
48 #if 0 /// UNNEEDED by elogind
49 static const char* const smack_attr_table[_SMACK_ATTR_MAX] = {
50 [SMACK_ATTR_ACCESS] = "security.SMACK64",
51 [SMACK_ATTR_EXEC] = "security.SMACK64EXEC",
52 [SMACK_ATTR_MMAP] = "security.SMACK64MMAP",
53 [SMACK_ATTR_TRANSMUTE] = "security.SMACK64TRANSMUTE",
54 [SMACK_ATTR_IPIN] = "security.SMACK64IPIN",
55 [SMACK_ATTR_IPOUT] = "security.SMACK64IPOUT",
58 DEFINE_STRING_TABLE_LOOKUP(smack_attr, SmackAttr);
60 int mac_smack_read(const char *path, SmackAttr attr, char **label) {
62 assert(attr >= 0 && attr < _SMACK_ATTR_MAX);
68 return getxattr_malloc(path, smack_attr_to_string(attr), label, true);
71 int mac_smack_read_fd(int fd, SmackAttr attr, char **label) {
73 assert(attr >= 0 && attr < _SMACK_ATTR_MAX);
79 return fgetxattr_malloc(fd, smack_attr_to_string(attr), label);
82 int mac_smack_apply(const char *path, SmackAttr attr, const char *label) {
86 assert(attr >= 0 && attr < _SMACK_ATTR_MAX);
92 r = lsetxattr(path, smack_attr_to_string(attr), label, strlen(label), 0);
94 r = lremovexattr(path, smack_attr_to_string(attr));
101 int mac_smack_apply_fd(int fd, SmackAttr attr, const char *label) {
105 assert(attr >= 0 && attr < _SMACK_ATTR_MAX);
107 if (!mac_smack_use())
111 r = fsetxattr(fd, smack_attr_to_string(attr), label, strlen(label), 0);
113 r = fremovexattr(fd, smack_attr_to_string(attr));
120 int mac_smack_apply_pid(pid_t pid, const char *label) {
126 if (!mac_smack_use())
129 p = procfs_file_alloca(pid, "attr/current");
130 r = write_string_file(p, label, 0);
138 int mac_smack_fix(const char *path, bool ignore_enoent, bool ignore_erofs) {
144 if (!mac_smack_use())
148 * Path must be in /dev and must exist
150 if (!path_startswith(path, "/dev"))
153 r = lstat(path, &st);
158 * Label directories and character devices "*".
159 * Label symlinks "_".
160 * Don't change anything else.
163 if (S_ISDIR(st.st_mode))
164 label = SMACK_STAR_LABEL;
165 else if (S_ISLNK(st.st_mode))
166 label = SMACK_FLOOR_LABEL;
167 else if (S_ISCHR(st.st_mode))
168 label = SMACK_STAR_LABEL;
172 r = lsetxattr(path, "security.SMACK64", label, strlen(label), 0);
174 /* If the FS doesn't support labels, then exit without warning */
175 if (r < 0 && errno == EOPNOTSUPP)
180 /* Ignore ENOENT in some cases */
181 if (ignore_enoent && errno == ENOENT)
184 if (ignore_erofs && errno == EROFS)
187 r = log_debug_errno(errno, "Unable to fix SMACK label of %s: %m", path);
193 #if 0 /// UNNEEDED by elogind
194 int mac_smack_copy(const char *dest, const char *src) {
196 _cleanup_free_ char *label = NULL;
201 r = mac_smack_read(src, SMACK_ATTR_ACCESS, &label);
205 r = mac_smack_apply(dest, SMACK_ATTR_ACCESS, label);
214 bool mac_smack_use(void) {
218 #if 0 /// UNNEEDED by elogind
219 int mac_smack_read(const char *path, SmackAttr attr, char **label) {
223 int mac_smack_read_fd(int fd, SmackAttr attr, char **label) {
227 int mac_smack_apply(const char *path, SmackAttr attr, const char *label) {
231 int mac_smack_apply_fd(int fd, SmackAttr attr, const char *label) {
235 int mac_smack_apply_pid(pid_t pid, const char *label) {
240 int mac_smack_fix(const char *path, bool ignore_enoent, bool ignore_erofs) {
244 #if 0 /// UNNEEDED by elogind
245 int mac_smack_copy(const char *dest, const char *src) {