1 /* SPDX-License-Identifier: LGPL-2.1+ */
3 Copyright © 2013 Intel Corporation
5 Nathaniel Chen <nathaniel.chen@intel.com>
14 #include "alloc-util.h"
15 #include "dirent-util.h"
20 #include "smack-setup.h"
21 #include "string-util.h"
26 static int fdopen_unlocked_at(int dfd
, const char *dir
, const char *name
, int *status
, FILE **ret_file
) {
30 fd
= openat(dfd
, name
, O_RDONLY
|O_CLOEXEC
);
35 return log_warning_errno(errno
, "Failed to open \"%s/%s\": %m", dir
, name
);
38 r
= fdopen_unlocked(fd
, "r", &f
);
44 return log_error_errno(r
, "Failed to open \"%s/%s\": %m", dir
, name
);
51 static int write_access2_rules(const char *srcdir
) {
52 _cleanup_close_
int load2_fd
= -1, change_fd
= -1;
53 _cleanup_closedir_
DIR *dir
= NULL
;
57 load2_fd
= open("/sys/fs/smackfs/load2", O_RDWR
|O_CLOEXEC
|O_NONBLOCK
|O_NOCTTY
);
60 log_warning_errno(errno
, "Failed to open '/sys/fs/smackfs/load2': %m");
61 return -errno
; /* negative error */
64 change_fd
= open("/sys/fs/smackfs/change-rule", O_RDWR
|O_CLOEXEC
|O_NONBLOCK
|O_NOCTTY
);
67 log_warning_errno(errno
, "Failed to open '/sys/fs/smackfs/change-rule': %m");
68 return -errno
; /* negative error */
71 /* write rules to load2 or change-rule from every file in the directory */
72 dir
= opendir(srcdir
);
75 log_warning_errno(errno
, "Failed to opendir '%s': %m", srcdir
);
76 return errno
; /* positive on purpose */
82 FOREACH_DIRENT(entry
, dir
, return 0) {
83 _cleanup_fclose_
FILE *policy
= NULL
;
85 dirent_ensure_type(dir
, entry
);
86 if (!dirent_is_file(entry
))
89 if (fdopen_unlocked_at(dfd
, srcdir
, entry
->d_name
, &r
, &policy
) < 0)
92 /* load2 write rules in the kernel require a line buffered stream */
94 _cleanup_free_
char *buf
= NULL
, *sbj
= NULL
, *obj
= NULL
, *acc1
= NULL
, *acc2
= NULL
;
97 q
= read_line(policy
, NAME_MAX
, &buf
);
99 return log_error_errno(q
, "Failed to read line from '%s': %m", entry
->d_name
);
103 if (isempty(buf
) || strchr(COMMENTS
, buf
[0]))
106 /* if 3 args -> load rule : subject object access1 */
107 /* if 4 args -> change rule : subject object access1 access2 */
108 if (sscanf(buf
, "%ms %ms %ms %ms", &sbj
, &obj
, &acc1
, &acc2
) < 3) {
109 log_error_errno(errno
, "Failed to parse rule '%s' in '%s', ignoring.", buf
, entry
->d_name
);
113 if (write(isempty(acc2
) ? load2_fd
: change_fd
, buf
, strlen(buf
)) < 0) {
116 log_error_errno(errno
, "Failed to write '%s' to '%s' in '%s': %m",
117 buf
, isempty(acc2
) ? "/sys/fs/smackfs/load2" : "/sys/fs/smackfs/change-rule", entry
->d_name
);
125 static int write_cipso2_rules(const char *srcdir
) {
126 _cleanup_close_
int cipso2_fd
= -1;
127 _cleanup_closedir_
DIR *dir
= NULL
;
128 struct dirent
*entry
;
131 cipso2_fd
= open("/sys/fs/smackfs/cipso2", O_RDWR
|O_CLOEXEC
|O_NONBLOCK
|O_NOCTTY
);
134 log_warning_errno(errno
, "Failed to open '/sys/fs/smackfs/cipso2': %m");
135 return -errno
; /* negative error */
138 /* write rules to cipso2 from every file in the directory */
139 dir
= opendir(srcdir
);
142 log_warning_errno(errno
, "Failed to opendir '%s': %m", srcdir
);
143 return errno
; /* positive on purpose */
149 FOREACH_DIRENT(entry
, dir
, return 0) {
150 _cleanup_fclose_
FILE *policy
= NULL
;
152 dirent_ensure_type(dir
, entry
);
153 if (!dirent_is_file(entry
))
156 if (fdopen_unlocked_at(dfd
, srcdir
, entry
->d_name
, &r
, &policy
) < 0)
159 /* cipso2 write rules in the kernel require a line buffered stream */
161 _cleanup_free_
char *buf
= NULL
;
164 q
= read_line(policy
, NAME_MAX
, &buf
);
166 return log_error_errno(q
, "Failed to read line from '%s': %m", entry
->d_name
);
170 if (isempty(buf
) || strchr(COMMENTS
, buf
[0]))
173 if (write(cipso2_fd
, buf
, strlen(buf
)) < 0) {
176 log_error_errno(errno
, "Failed to write '%s' to '/sys/fs/smackfs/cipso2' in '%s': %m",
186 static int write_netlabel_rules(const char *srcdir
) {
187 _cleanup_fclose_
FILE *dst
= NULL
;
188 _cleanup_closedir_
DIR *dir
= NULL
;
189 struct dirent
*entry
;
192 dst
= fopen("/sys/fs/smackfs/netlabel", "we");
195 log_warning_errno(errno
, "Failed to open /sys/fs/smackfs/netlabel: %m");
196 return -errno
; /* negative error */
199 /* write rules to dst from every file in the directory */
200 dir
= opendir(srcdir
);
203 log_warning_errno(errno
, "Failed to opendir %s: %m", srcdir
);
204 return errno
; /* positive on purpose */
210 FOREACH_DIRENT(entry
, dir
, return 0) {
211 _cleanup_fclose_
FILE *policy
= NULL
;
213 if (fdopen_unlocked_at(dfd
, srcdir
, entry
->d_name
, &r
, &policy
) < 0)
216 /* load2 write rules in the kernel require a line buffered stream */
218 _cleanup_free_
char *buf
= NULL
;
221 q
= read_line(policy
, NAME_MAX
, &buf
);
223 return log_error_errno(q
, "Failed to read line from %s: %m", entry
->d_name
);
227 if (!fputs(buf
, dst
)) {
230 log_error_errno(errno
, "Failed to write line to /sys/fs/smackfs/netlabel: %m");
233 q
= fflush_and_check(dst
);
237 log_error_errno(q
, "Failed to flush writes to /sys/fs/smackfs/netlabel: %m");
246 static int write_onlycap_list(void) {
247 _cleanup_close_
int onlycap_fd
= -1;
248 _cleanup_free_
char *list
= NULL
;
249 _cleanup_fclose_
FILE *f
= NULL
;
250 size_t len
= 0, allocated
= 0;
253 f
= fopen("/etc/smack/onlycap", "re");
256 log_warning_errno(errno
, "Failed to read '/etc/smack/onlycap': %m");
258 return errno
== ENOENT
? ENOENT
: -errno
;
262 _cleanup_free_
char *buf
= NULL
;
265 r
= read_line(f
, LONG_LINE_MAX
, &buf
);
267 return log_error_errno(r
, "Failed to read line from /etc/smack/onlycap: %m");
271 if (isempty(buf
) || strchr(COMMENTS
, *buf
))
275 if (!GREEDY_REALLOC(list
, allocated
, len
+ l
+ 1))
278 stpcpy(list
+ len
, buf
)[0] = ' ';
287 onlycap_fd
= open("/sys/fs/smackfs/onlycap", O_WRONLY
|O_CLOEXEC
|O_NONBLOCK
|O_NOCTTY
);
288 if (onlycap_fd
< 0) {
290 log_warning_errno(errno
, "Failed to open '/sys/fs/smackfs/onlycap': %m");
291 return -errno
; /* negative error */
294 r
= write(onlycap_fd
, list
, len
);
296 return log_error_errno(errno
, "Failed to write onlycap list(%s) to '/sys/fs/smackfs/onlycap': %m", list
);
303 int mac_smack_setup(bool *loaded_policy
) {
309 assert(loaded_policy
);
311 r
= write_access2_rules("/etc/smack/accesses.d/");
314 log_debug("Smack is not enabled in the kernel.");
317 log_debug("Smack access rules directory '/etc/smack/accesses.d/' not found");
320 log_info("Successfully loaded Smack policies.");
323 log_warning_errno(r
, "Failed to load Smack access rules, ignoring: %m");
327 #ifdef SMACK_RUN_LABEL
328 r
= write_string_file("/proc/self/attr/current", SMACK_RUN_LABEL
, WRITE_STRING_FILE_DISABLE_BUFFER
);
330 log_warning_errno(r
, "Failed to set SMACK label \"" SMACK_RUN_LABEL
"\" on self: %m");
331 r
= write_string_file("/sys/fs/smackfs/ambient", SMACK_RUN_LABEL
, WRITE_STRING_FILE_DISABLE_BUFFER
);
333 log_warning_errno(r
, "Failed to set SMACK ambient label \"" SMACK_RUN_LABEL
"\": %m");
334 r
= write_string_file("/sys/fs/smackfs/netlabel",
335 "0.0.0.0/0 " SMACK_RUN_LABEL
, WRITE_STRING_FILE_DISABLE_BUFFER
);
337 log_warning_errno(r
, "Failed to set SMACK netlabel rule \"0.0.0.0/0 " SMACK_RUN_LABEL
"\": %m");
338 r
= write_string_file("/sys/fs/smackfs/netlabel", "127.0.0.1 -CIPSO", WRITE_STRING_FILE_DISABLE_BUFFER
);
340 log_warning_errno(r
, "Failed to set SMACK netlabel rule \"127.0.0.1 -CIPSO\": %m");
343 r
= write_cipso2_rules("/etc/smack/cipso.d/");
346 log_debug("Smack/CIPSO is not enabled in the kernel.");
349 log_debug("Smack/CIPSO access rules directory '/etc/smack/cipso.d/' not found");
352 log_info("Successfully loaded Smack/CIPSO policies.");
355 log_warning_errno(r
, "Failed to load Smack/CIPSO access rules, ignoring: %m");
359 r
= write_netlabel_rules("/etc/smack/netlabel.d/");
362 log_debug("Smack/CIPSO is not enabled in the kernel.");
365 log_debug("Smack network host rules directory '/etc/smack/netlabel.d/' not found");
368 log_info("Successfully loaded Smack network host rules.");
371 log_warning_errno(r
, "Failed to load Smack network host rules: %m, ignoring.");
375 r
= write_onlycap_list();
378 log_debug("Smack is not enabled in the kernel.");
381 log_debug("Smack onlycap list file '/etc/smack/onlycap' not found");
384 log_info("Successfully wrote Smack onlycap list.");
387 log_emergency_errno(r
, "Failed to write Smack onlycap list: %m");
391 *loaded_policy
= true;