1 /* SPDX-License-Identifier: LGPL-2.1+ */
3 Copyright © 2013 Intel Corporation
5 Nathaniel Chen <nathaniel.chen@intel.com>
15 #include "alloc-util.h"
16 #include "dirent-util.h"
21 #include "smack-setup.h"
22 #include "string-util.h"
27 static int fdopen_unlocked_at(int dfd
, const char *dir
, const char *name
, int *status
, FILE **ret_file
) {
31 fd
= openat(dfd
, name
, O_RDONLY
|O_CLOEXEC
);
36 return log_warning_errno(errno
, "Failed to open \"%s/%s\": %m", dir
, name
);
39 r
= fdopen_unlocked(fd
, "r", &f
);
45 return log_error_errno(r
, "Failed to open \"%s/%s\": %m", dir
, name
);
52 static int write_access2_rules(const char *srcdir
) {
53 _cleanup_close_
int load2_fd
= -1, change_fd
= -1;
54 _cleanup_closedir_
DIR *dir
= NULL
;
58 load2_fd
= open("/sys/fs/smackfs/load2", O_RDWR
|O_CLOEXEC
|O_NONBLOCK
|O_NOCTTY
);
61 log_warning_errno(errno
, "Failed to open '/sys/fs/smackfs/load2': %m");
62 return -errno
; /* negative error */
65 change_fd
= open("/sys/fs/smackfs/change-rule", O_RDWR
|O_CLOEXEC
|O_NONBLOCK
|O_NOCTTY
);
68 log_warning_errno(errno
, "Failed to open '/sys/fs/smackfs/change-rule': %m");
69 return -errno
; /* negative error */
72 /* write rules to load2 or change-rule from every file in the directory */
73 dir
= opendir(srcdir
);
76 log_warning_errno(errno
, "Failed to opendir '%s': %m", srcdir
);
77 return errno
; /* positive on purpose */
83 FOREACH_DIRENT(entry
, dir
, return 0) {
84 _cleanup_fclose_
FILE *policy
= NULL
;
86 dirent_ensure_type(dir
, entry
);
87 if (!dirent_is_file(entry
))
90 if (fdopen_unlocked_at(dfd
, srcdir
, entry
->d_name
, &r
, &policy
) < 0)
93 /* load2 write rules in the kernel require a line buffered stream */
95 _cleanup_free_
char *buf
= NULL
, *sbj
= NULL
, *obj
= NULL
, *acc1
= NULL
, *acc2
= NULL
;
98 q
= read_line(policy
, NAME_MAX
, &buf
);
100 return log_error_errno(q
, "Failed to read line from '%s': %m", entry
->d_name
);
104 if (isempty(buf
) || strchr(COMMENTS
, buf
[0]))
107 /* if 3 args -> load rule : subject object access1 */
108 /* if 4 args -> change rule : subject object access1 access2 */
109 if (sscanf(buf
, "%ms %ms %ms %ms", &sbj
, &obj
, &acc1
, &acc2
) < 3) {
110 log_error_errno(errno
, "Failed to parse rule '%s' in '%s', ignoring.", buf
, entry
->d_name
);
114 if (write(isempty(acc2
) ? load2_fd
: change_fd
, buf
, strlen(buf
)) < 0) {
117 log_error_errno(errno
, "Failed to write '%s' to '%s' in '%s': %m",
118 buf
, isempty(acc2
) ? "/sys/fs/smackfs/load2" : "/sys/fs/smackfs/change-rule", entry
->d_name
);
126 static int write_cipso2_rules(const char *srcdir
) {
127 _cleanup_close_
int cipso2_fd
= -1;
128 _cleanup_closedir_
DIR *dir
= NULL
;
129 struct dirent
*entry
;
132 cipso2_fd
= open("/sys/fs/smackfs/cipso2", O_RDWR
|O_CLOEXEC
|O_NONBLOCK
|O_NOCTTY
);
135 log_warning_errno(errno
, "Failed to open '/sys/fs/smackfs/cipso2': %m");
136 return -errno
; /* negative error */
139 /* write rules to cipso2 from every file in the directory */
140 dir
= opendir(srcdir
);
143 log_warning_errno(errno
, "Failed to opendir '%s': %m", srcdir
);
144 return errno
; /* positive on purpose */
150 FOREACH_DIRENT(entry
, dir
, return 0) {
151 _cleanup_fclose_
FILE *policy
= NULL
;
153 dirent_ensure_type(dir
, entry
);
154 if (!dirent_is_file(entry
))
157 if (fdopen_unlocked_at(dfd
, srcdir
, entry
->d_name
, &r
, &policy
) < 0)
160 /* cipso2 write rules in the kernel require a line buffered stream */
162 _cleanup_free_
char *buf
= NULL
;
165 q
= read_line(policy
, NAME_MAX
, &buf
);
167 return log_error_errno(q
, "Failed to read line from '%s': %m", entry
->d_name
);
171 if (isempty(buf
) || strchr(COMMENTS
, buf
[0]))
174 if (write(cipso2_fd
, buf
, strlen(buf
)) < 0) {
177 log_error_errno(errno
, "Failed to write '%s' to '/sys/fs/smackfs/cipso2' in '%s': %m",
187 static int write_netlabel_rules(const char *srcdir
) {
188 _cleanup_fclose_
FILE *dst
= NULL
;
189 _cleanup_closedir_
DIR *dir
= NULL
;
190 struct dirent
*entry
;
193 dst
= fopen("/sys/fs/smackfs/netlabel", "we");
196 log_warning_errno(errno
, "Failed to open /sys/fs/smackfs/netlabel: %m");
197 return -errno
; /* negative error */
200 /* write rules to dst from every file in the directory */
201 dir
= opendir(srcdir
);
204 log_warning_errno(errno
, "Failed to opendir %s: %m", srcdir
);
205 return errno
; /* positive on purpose */
211 FOREACH_DIRENT(entry
, dir
, return 0) {
212 _cleanup_fclose_
FILE *policy
= NULL
;
214 if (fdopen_unlocked_at(dfd
, srcdir
, entry
->d_name
, &r
, &policy
) < 0)
217 /* load2 write rules in the kernel require a line buffered stream */
219 _cleanup_free_
char *buf
= NULL
;
222 q
= read_line(policy
, NAME_MAX
, &buf
);
224 return log_error_errno(q
, "Failed to read line from %s: %m", entry
->d_name
);
228 if (!fputs(buf
, dst
)) {
231 log_error_errno(errno
, "Failed to write line to /sys/fs/smackfs/netlabel: %m");
234 q
= fflush_and_check(dst
);
238 log_error_errno(q
, "Failed to flush writes to /sys/fs/smackfs/netlabel: %m");
247 static int write_onlycap_list(void) {
248 _cleanup_close_
int onlycap_fd
= -1;
249 _cleanup_free_
char *list
= NULL
;
250 _cleanup_fclose_
FILE *f
= NULL
;
251 size_t len
= 0, allocated
= 0;
254 f
= fopen("/etc/smack/onlycap", "re");
257 log_warning_errno(errno
, "Failed to read '/etc/smack/onlycap': %m");
259 return errno
== ENOENT
? ENOENT
: -errno
;
263 _cleanup_free_
char *buf
= NULL
;
266 r
= read_line(f
, LONG_LINE_MAX
, &buf
);
268 return log_error_errno(r
, "Failed to read line from /etc/smack/onlycap: %m");
272 if (isempty(buf
) || strchr(COMMENTS
, *buf
))
276 if (!GREEDY_REALLOC(list
, allocated
, len
+ l
+ 1))
279 stpcpy(list
+ len
, buf
)[0] = ' ';
288 onlycap_fd
= open("/sys/fs/smackfs/onlycap", O_WRONLY
|O_CLOEXEC
|O_NONBLOCK
|O_NOCTTY
);
289 if (onlycap_fd
< 0) {
291 log_warning_errno(errno
, "Failed to open '/sys/fs/smackfs/onlycap': %m");
292 return -errno
; /* negative error */
295 r
= write(onlycap_fd
, list
, len
);
297 return log_error_errno(errno
, "Failed to write onlycap list(%s) to '/sys/fs/smackfs/onlycap': %m", list
);
304 int mac_smack_setup(bool *loaded_policy
) {
310 assert(loaded_policy
);
312 r
= write_access2_rules("/etc/smack/accesses.d/");
315 log_debug("Smack is not enabled in the kernel.");
318 log_debug("Smack access rules directory '/etc/smack/accesses.d/' not found");
321 log_info("Successfully loaded Smack policies.");
324 log_warning_errno(r
, "Failed to load Smack access rules, ignoring: %m");
328 #ifdef SMACK_RUN_LABEL
329 r
= write_string_file("/proc/self/attr/current", SMACK_RUN_LABEL
, WRITE_STRING_FILE_DISABLE_BUFFER
);
331 log_warning_errno(r
, "Failed to set SMACK label \"" SMACK_RUN_LABEL
"\" on self: %m");
332 r
= write_string_file("/sys/fs/smackfs/ambient", SMACK_RUN_LABEL
, WRITE_STRING_FILE_DISABLE_BUFFER
);
334 log_warning_errno(r
, "Failed to set SMACK ambient label \"" SMACK_RUN_LABEL
"\": %m");
335 r
= write_string_file("/sys/fs/smackfs/netlabel",
336 "0.0.0.0/0 " SMACK_RUN_LABEL
, WRITE_STRING_FILE_DISABLE_BUFFER
);
338 log_warning_errno(r
, "Failed to set SMACK netlabel rule \"0.0.0.0/0 " SMACK_RUN_LABEL
"\": %m");
339 r
= write_string_file("/sys/fs/smackfs/netlabel", "127.0.0.1 -CIPSO", WRITE_STRING_FILE_DISABLE_BUFFER
);
341 log_warning_errno(r
, "Failed to set SMACK netlabel rule \"127.0.0.1 -CIPSO\": %m");
344 r
= write_cipso2_rules("/etc/smack/cipso.d/");
347 log_debug("Smack/CIPSO is not enabled in the kernel.");
350 log_debug("Smack/CIPSO access rules directory '/etc/smack/cipso.d/' not found");
353 log_info("Successfully loaded Smack/CIPSO policies.");
356 log_warning_errno(r
, "Failed to load Smack/CIPSO access rules, ignoring: %m");
360 r
= write_netlabel_rules("/etc/smack/netlabel.d/");
363 log_debug("Smack/CIPSO is not enabled in the kernel.");
366 log_debug("Smack network host rules directory '/etc/smack/netlabel.d/' not found");
369 log_info("Successfully loaded Smack network host rules.");
372 log_warning_errno(r
, "Failed to load Smack network host rules: %m, ignoring.");
376 r
= write_onlycap_list();
379 log_debug("Smack is not enabled in the kernel.");
382 log_debug("Smack onlycap list file '/etc/smack/onlycap' not found");
385 log_info("Successfully wrote Smack onlycap list.");
388 log_emergency_errno(r
, "Failed to write Smack onlycap list: %m");
392 *loaded_policy
= true;