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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
ffbd2c4d | 2 | /*** |
810adae9 | 3 | Copyright © 2013 Intel Corporation |
ffbd2c4d NC |
4 | Authors: |
5 | Nathaniel Chen <nathaniel.chen@intel.com> | |
ffbd2c4d NC |
6 | ***/ |
7 | ||
07630cea | 8 | #include <dirent.h> |
ffbd2c4d | 9 | #include <errno.h> |
ffbd2c4d | 10 | #include <fcntl.h> |
07630cea | 11 | #include <stdio.h> |
0d536673 | 12 | #include <stdio_ext.h> |
07630cea LP |
13 | #include <stdlib.h> |
14 | #include <string.h> | |
ffbd2c4d | 15 | |
b5efdb8a | 16 | #include "alloc-util.h" |
ea8b6526 | 17 | #include "def.h" |
a0956174 | 18 | #include "dirent-util.h" |
3ffd4af2 | 19 | #include "fd-util.h" |
8b197c3a | 20 | #include "fileio.h" |
ffbd2c4d | 21 | #include "log.h" |
07630cea | 22 | #include "macro.h" |
3ffd4af2 | 23 | #include "smack-setup.h" |
07630cea LP |
24 | #include "string-util.h" |
25 | #include "util.h" | |
ffbd2c4d | 26 | |
f9fa32f0 | 27 | #if ENABLE_SMACK |
2b3e18de | 28 | |
6656aefb WC |
29 | static int write_access2_rules(const char* srcdir) { |
30 | _cleanup_close_ int load2_fd = -1, change_fd = -1; | |
ffbd2c4d NC |
31 | _cleanup_closedir_ DIR *dir = NULL; |
32 | struct dirent *entry; | |
ffbd2c4d | 33 | int dfd = -1; |
a4783bd1 | 34 | int r = 0; |
ffbd2c4d | 35 | |
6656aefb WC |
36 | load2_fd = open("/sys/fs/smackfs/load2", O_RDWR|O_CLOEXEC|O_NONBLOCK|O_NOCTTY); |
37 | if (load2_fd < 0) { | |
38 | if (errno != ENOENT) | |
39 | log_warning_errno(errno, "Failed to open '/sys/fs/smackfs/load2': %m"); | |
40 | return -errno; /* negative error */ | |
41 | } | |
42 | ||
43 | change_fd = open("/sys/fs/smackfs/change-rule", O_RDWR|O_CLOEXEC|O_NONBLOCK|O_NOCTTY); | |
44 | if (change_fd < 0) { | |
a4783bd1 | 45 | if (errno != ENOENT) |
6656aefb | 46 | log_warning_errno(errno, "Failed to open '/sys/fs/smackfs/change-rule': %m"); |
a4783bd1 | 47 | return -errno; /* negative error */ |
ffbd2c4d NC |
48 | } |
49 | ||
6656aefb | 50 | /* write rules to load2 or change-rule from every file in the directory */ |
a4783bd1 | 51 | dir = opendir(srcdir); |
ffbd2c4d | 52 | if (!dir) { |
a4783bd1 | 53 | if (errno != ENOENT) |
6656aefb | 54 | log_warning_errno(errno, "Failed to opendir '%s': %m", srcdir); |
a4783bd1 | 55 | return errno; /* positive on purpose */ |
ffbd2c4d NC |
56 | } |
57 | ||
58 | dfd = dirfd(dir); | |
fea7838e | 59 | assert(dfd >= 0); |
ffbd2c4d NC |
60 | |
61 | FOREACH_DIRENT(entry, dir, return 0) { | |
a4783bd1 | 62 | int fd; |
ffbd2c4d | 63 | _cleanup_fclose_ FILE *policy = NULL; |
ffbd2c4d | 64 | |
6656aefb WC |
65 | if (!dirent_is_file(entry)) |
66 | continue; | |
67 | ||
a4783bd1 ZJS |
68 | fd = openat(dfd, entry->d_name, O_RDONLY|O_CLOEXEC); |
69 | if (fd < 0) { | |
70 | if (r == 0) | |
71 | r = -errno; | |
6656aefb | 72 | log_warning_errno(errno, "Failed to open '%s': %m", entry->d_name); |
ffbd2c4d NC |
73 | continue; |
74 | } | |
75 | ||
a4783bd1 | 76 | policy = fdopen(fd, "re"); |
ffbd2c4d | 77 | if (!policy) { |
a4783bd1 ZJS |
78 | if (r == 0) |
79 | r = -errno; | |
03e334a1 | 80 | safe_close(fd); |
6656aefb | 81 | log_error_errno(errno, "Failed to open '%s': %m", entry->d_name); |
ffbd2c4d NC |
82 | continue; |
83 | } | |
84 | ||
ffbd2c4d | 85 | /* load2 write rules in the kernel require a line buffered stream */ |
ea8b6526 LP |
86 | for (;;) { |
87 | _cleanup_free_ char *buf = NULL, *sbj = NULL, *obj = NULL, *acc1 = NULL, *acc2 = NULL; | |
88 | int q; | |
6656aefb | 89 | |
ea8b6526 LP |
90 | q = read_line(policy, NAME_MAX, &buf); |
91 | if (q < 0) | |
92 | return log_error_errno(q, "Failed to read line from '%s': %m", entry->d_name); | |
93 | if (q == 0) | |
94 | break; | |
6656aefb | 95 | |
ea8b6526 | 96 | if (isempty(buf) || strchr(COMMENTS, buf[0])) |
6656aefb WC |
97 | continue; |
98 | ||
99 | /* if 3 args -> load rule : subject object access1 */ | |
100 | /* if 4 args -> change rule : subject object access1 access2 */ | |
101 | if (sscanf(buf, "%ms %ms %ms %ms", &sbj, &obj, &acc1, &acc2) < 3) { | |
102 | log_error_errno(errno, "Failed to parse rule '%s' in '%s', ignoring.", buf, entry->d_name); | |
103 | continue; | |
104 | } | |
105 | ||
106 | if (write(isempty(acc2) ? load2_fd : change_fd, buf, strlen(buf)) < 0) { | |
a4783bd1 | 107 | if (r == 0) |
6656aefb | 108 | r = -errno; |
5e1ee764 | 109 | log_error_errno(errno, "Failed to write '%s' to '%s' in '%s': %m", |
6656aefb | 110 | buf, isempty(acc2) ? "/sys/fs/smackfs/load2" : "/sys/fs/smackfs/change-rule", entry->d_name); |
a4783bd1 | 111 | } |
6656aefb WC |
112 | } |
113 | } | |
114 | ||
115 | return r; | |
116 | } | |
117 | ||
118 | static int write_cipso2_rules(const char* srcdir) { | |
119 | _cleanup_close_ int cipso2_fd = -1; | |
120 | _cleanup_closedir_ DIR *dir = NULL; | |
121 | struct dirent *entry; | |
6656aefb WC |
122 | int dfd = -1; |
123 | int r = 0; | |
124 | ||
125 | cipso2_fd = open("/sys/fs/smackfs/cipso2", O_RDWR|O_CLOEXEC|O_NONBLOCK|O_NOCTTY); | |
126 | if (cipso2_fd < 0) { | |
127 | if (errno != ENOENT) | |
128 | log_warning_errno(errno, "Failed to open '/sys/fs/smackfs/cipso2': %m"); | |
129 | return -errno; /* negative error */ | |
130 | } | |
131 | ||
132 | /* write rules to cipso2 from every file in the directory */ | |
133 | dir = opendir(srcdir); | |
134 | if (!dir) { | |
135 | if (errno != ENOENT) | |
136 | log_warning_errno(errno, "Failed to opendir '%s': %m", srcdir); | |
137 | return errno; /* positive on purpose */ | |
138 | } | |
139 | ||
140 | dfd = dirfd(dir); | |
141 | assert(dfd >= 0); | |
142 | ||
143 | FOREACH_DIRENT(entry, dir, return 0) { | |
144 | int fd; | |
145 | _cleanup_fclose_ FILE *policy = NULL; | |
146 | ||
147 | if (!dirent_is_file(entry)) | |
148 | continue; | |
149 | ||
150 | fd = openat(dfd, entry->d_name, O_RDONLY|O_CLOEXEC); | |
151 | if (fd < 0) { | |
152 | if (r == 0) | |
153 | r = -errno; | |
154 | log_error_errno(errno, "Failed to open '%s': %m", entry->d_name); | |
155 | continue; | |
156 | } | |
157 | ||
158 | policy = fdopen(fd, "re"); | |
159 | if (!policy) { | |
160 | if (r == 0) | |
161 | r = -errno; | |
162 | safe_close(fd); | |
163 | log_error_errno(errno, "Failed to open '%s': %m", entry->d_name); | |
164 | continue; | |
165 | } | |
166 | ||
167 | /* cipso2 write rules in the kernel require a line buffered stream */ | |
ea8b6526 LP |
168 | for (;;) { |
169 | _cleanup_free_ char *buf = NULL; | |
170 | int q; | |
171 | ||
172 | q = read_line(policy, NAME_MAX, &buf); | |
173 | if (q < 0) | |
174 | return log_error_errno(q, "Failed to read line from '%s': %m", entry->d_name); | |
175 | if (q == 0) | |
176 | break; | |
6656aefb | 177 | |
ea8b6526 | 178 | if (isempty(buf) || strchr(COMMENTS, buf[0])) |
6656aefb WC |
179 | continue; |
180 | ||
181 | if (write(cipso2_fd, buf, strlen(buf)) < 0) { | |
a4783bd1 ZJS |
182 | if (r == 0) |
183 | r = -errno; | |
5e1ee764 | 184 | log_error_errno(errno, "Failed to write '%s' to '/sys/fs/smackfs/cipso2' in '%s': %m", |
6656aefb | 185 | buf, entry->d_name); |
a4783bd1 ZJS |
186 | break; |
187 | } | |
ffbd2c4d NC |
188 | } |
189 | } | |
190 | ||
6656aefb | 191 | return r; |
a4783bd1 ZJS |
192 | } |
193 | ||
ae176752 CS |
194 | static int write_netlabel_rules(const char* srcdir) { |
195 | _cleanup_fclose_ FILE *dst = NULL; | |
196 | _cleanup_closedir_ DIR *dir = NULL; | |
197 | struct dirent *entry; | |
ae176752 CS |
198 | int dfd = -1; |
199 | int r = 0; | |
200 | ||
201 | dst = fopen("/sys/fs/smackfs/netlabel", "we"); | |
202 | if (!dst) { | |
203 | if (errno != ENOENT) | |
204 | log_warning_errno(errno, "Failed to open /sys/fs/smackfs/netlabel: %m"); | |
205 | return -errno; /* negative error */ | |
206 | } | |
207 | ||
208 | /* write rules to dst from every file in the directory */ | |
209 | dir = opendir(srcdir); | |
210 | if (!dir) { | |
211 | if (errno != ENOENT) | |
212 | log_warning_errno(errno, "Failed to opendir %s: %m", srcdir); | |
213 | return errno; /* positive on purpose */ | |
214 | } | |
215 | ||
216 | dfd = dirfd(dir); | |
217 | assert(dfd >= 0); | |
218 | ||
219 | FOREACH_DIRENT(entry, dir, return 0) { | |
220 | int fd; | |
221 | _cleanup_fclose_ FILE *policy = NULL; | |
222 | ||
223 | fd = openat(dfd, entry->d_name, O_RDONLY|O_CLOEXEC); | |
224 | if (fd < 0) { | |
225 | if (r == 0) | |
226 | r = -errno; | |
227 | log_warning_errno(errno, "Failed to open %s: %m", entry->d_name); | |
228 | continue; | |
229 | } | |
230 | ||
231 | policy = fdopen(fd, "re"); | |
232 | if (!policy) { | |
233 | if (r == 0) | |
234 | r = -errno; | |
235 | safe_close(fd); | |
236 | log_error_errno(errno, "Failed to open %s: %m", entry->d_name); | |
237 | continue; | |
238 | } | |
239 | ||
0d536673 LP |
240 | (void) __fsetlocking(policy, FSETLOCKING_BYCALLER); |
241 | ||
ae176752 | 242 | /* load2 write rules in the kernel require a line buffered stream */ |
ea8b6526 LP |
243 | for (;;) { |
244 | _cleanup_free_ char *buf = NULL; | |
0d536673 LP |
245 | int q; |
246 | ||
ea8b6526 LP |
247 | q = read_line(policy, NAME_MAX, &buf); |
248 | if (q < 0) | |
249 | return log_error_errno(q, "Failed to read line from %s: %m", entry->d_name); | |
250 | if (q == 0) | |
251 | break; | |
252 | ||
0d536673 | 253 | if (!fputs(buf, dst)) { |
ae176752 CS |
254 | if (r == 0) |
255 | r = -EINVAL; | |
5e1ee764 | 256 | log_error_errno(errno, "Failed to write line to /sys/fs/smackfs/netlabel: %m"); |
ae176752 CS |
257 | break; |
258 | } | |
0d536673 LP |
259 | q = fflush_and_check(dst); |
260 | if (q < 0) { | |
ae176752 | 261 | if (r == 0) |
0d536673 LP |
262 | r = q; |
263 | log_error_errno(q, "Failed to flush writes to /sys/fs/smackfs/netlabel: %m"); | |
ae176752 CS |
264 | break; |
265 | } | |
266 | } | |
267 | } | |
268 | ||
7f508f2c | 269 | return r; |
ae176752 CS |
270 | } |
271 | ||
217f95db WC |
272 | static int write_onlycap_list(void) { |
273 | _cleanup_close_ int onlycap_fd = -1; | |
274 | _cleanup_free_ char *list = NULL; | |
275 | _cleanup_fclose_ FILE *f = NULL; | |
276 | size_t len = 0, allocated = 0; | |
217f95db WC |
277 | int r; |
278 | ||
279 | f = fopen("/etc/smack/onlycap", "re"); | |
280 | if (!f) { | |
281 | if (errno != ENOENT) | |
9fd0b029 LP |
282 | log_warning_errno(errno, "Failed to read '/etc/smack/onlycap': %m"); |
283 | ||
217f95db WC |
284 | return errno == ENOENT ? ENOENT : -errno; |
285 | } | |
286 | ||
ea8b6526 LP |
287 | for (;;) { |
288 | _cleanup_free_ char *buf = NULL; | |
217f95db WC |
289 | size_t l; |
290 | ||
ea8b6526 LP |
291 | r = read_line(f, LONG_LINE_MAX, &buf); |
292 | if (r < 0) | |
293 | return log_error_errno(r, "Failed to read line from /etc/smack/onlycap: %m"); | |
294 | if (r == 0) | |
295 | break; | |
296 | ||
297 | if (isempty(buf) || strchr(COMMENTS, *buf)) | |
217f95db WC |
298 | continue; |
299 | ||
300 | l = strlen(buf); | |
301 | if (!GREEDY_REALLOC(list, allocated, len + l + 1)) | |
302 | return log_oom(); | |
303 | ||
304 | stpcpy(list + len, buf)[0] = ' '; | |
305 | len += l + 1; | |
306 | } | |
307 | ||
9fd0b029 | 308 | if (len == 0) |
217f95db WC |
309 | return 0; |
310 | ||
311 | list[len - 1] = 0; | |
312 | ||
313 | onlycap_fd = open("/sys/fs/smackfs/onlycap", O_WRONLY|O_CLOEXEC|O_NONBLOCK|O_NOCTTY); | |
314 | if (onlycap_fd < 0) { | |
315 | if (errno != ENOENT) | |
9fd0b029 | 316 | log_warning_errno(errno, "Failed to open '/sys/fs/smackfs/onlycap': %m"); |
217f95db WC |
317 | return -errno; /* negative error */ |
318 | } | |
319 | ||
320 | r = write(onlycap_fd, list, len); | |
321 | if (r < 0) | |
9fd0b029 | 322 | return log_error_errno(errno, "Failed to write onlycap list(%s) to '/sys/fs/smackfs/onlycap': %m", list); |
217f95db WC |
323 | |
324 | return 0; | |
325 | } | |
326 | ||
2b3e18de | 327 | #endif |
ffbd2c4d | 328 | |
8a188de9 | 329 | int mac_smack_setup(bool *loaded_policy) { |
2b3e18de | 330 | |
f9fa32f0 | 331 | #if ENABLE_SMACK |
2b3e18de | 332 | |
a4783bd1 ZJS |
333 | int r; |
334 | ||
e49d3c01 ŁS |
335 | assert(loaded_policy); |
336 | ||
6656aefb | 337 | r = write_access2_rules("/etc/smack/accesses.d/"); |
a4783bd1 ZJS |
338 | switch(r) { |
339 | case -ENOENT: | |
340 | log_debug("Smack is not enabled in the kernel."); | |
341 | return 0; | |
342 | case ENOENT: | |
6656aefb | 343 | log_debug("Smack access rules directory '/etc/smack/accesses.d/' not found"); |
a4783bd1 ZJS |
344 | return 0; |
345 | case 0: | |
346 | log_info("Successfully loaded Smack policies."); | |
abbacb1d NC |
347 | break; |
348 | default: | |
e53fc357 | 349 | log_warning_errno(r, "Failed to load Smack access rules, ignoring: %m"); |
abbacb1d NC |
350 | return 0; |
351 | } | |
352 | ||
8b197c3a | 353 | #ifdef SMACK_RUN_LABEL |
57512c89 | 354 | r = write_string_file("/proc/self/attr/current", SMACK_RUN_LABEL, WRITE_STRING_FILE_DISABLE_BUFFER); |
ae176752 CS |
355 | if (r < 0) |
356 | log_warning_errno(r, "Failed to set SMACK label \"" SMACK_RUN_LABEL "\" on self: %m"); | |
57512c89 | 357 | r = write_string_file("/sys/fs/smackfs/ambient", SMACK_RUN_LABEL, WRITE_STRING_FILE_DISABLE_BUFFER); |
ae176752 CS |
358 | if (r < 0) |
359 | log_warning_errno(r, "Failed to set SMACK ambient label \"" SMACK_RUN_LABEL "\": %m"); | |
360 | r = write_string_file("/sys/fs/smackfs/netlabel", | |
57512c89 | 361 | "0.0.0.0/0 " SMACK_RUN_LABEL, WRITE_STRING_FILE_DISABLE_BUFFER); |
ae176752 CS |
362 | if (r < 0) |
363 | log_warning_errno(r, "Failed to set SMACK netlabel rule \"0.0.0.0/0 " SMACK_RUN_LABEL "\": %m"); | |
57512c89 | 364 | r = write_string_file("/sys/fs/smackfs/netlabel", "127.0.0.1 -CIPSO", WRITE_STRING_FILE_DISABLE_BUFFER); |
ae176752 CS |
365 | if (r < 0) |
366 | log_warning_errno(r, "Failed to set SMACK netlabel rule \"127.0.0.1 -CIPSO\": %m"); | |
8b197c3a AK |
367 | #endif |
368 | ||
6656aefb | 369 | r = write_cipso2_rules("/etc/smack/cipso.d/"); |
abbacb1d NC |
370 | switch(r) { |
371 | case -ENOENT: | |
372 | log_debug("Smack/CIPSO is not enabled in the kernel."); | |
373 | return 0; | |
374 | case ENOENT: | |
6656aefb | 375 | log_debug("Smack/CIPSO access rules directory '/etc/smack/cipso.d/' not found"); |
ae176752 | 376 | break; |
abbacb1d NC |
377 | case 0: |
378 | log_info("Successfully loaded Smack/CIPSO policies."); | |
b9289d4c | 379 | break; |
a4783bd1 | 380 | default: |
e53fc357 | 381 | log_warning_errno(r, "Failed to load Smack/CIPSO access rules, ignoring: %m"); |
ae176752 CS |
382 | break; |
383 | } | |
384 | ||
385 | r = write_netlabel_rules("/etc/smack/netlabel.d/"); | |
386 | switch(r) { | |
387 | case -ENOENT: | |
388 | log_debug("Smack/CIPSO is not enabled in the kernel."); | |
a4783bd1 | 389 | return 0; |
ae176752 CS |
390 | case ENOENT: |
391 | log_debug("Smack network host rules directory '/etc/smack/netlabel.d/' not found"); | |
392 | break; | |
393 | case 0: | |
394 | log_info("Successfully loaded Smack network host rules."); | |
395 | break; | |
396 | default: | |
397 | log_warning_errno(r, "Failed to load Smack network host rules: %m, ignoring."); | |
398 | break; | |
a4783bd1 | 399 | } |
2b3e18de | 400 | |
217f95db WC |
401 | r = write_onlycap_list(); |
402 | switch(r) { | |
403 | case -ENOENT: | |
404 | log_debug("Smack is not enabled in the kernel."); | |
405 | break; | |
406 | case ENOENT: | |
407 | log_debug("Smack onlycap list file '/etc/smack/onlycap' not found"); | |
408 | break; | |
409 | case 0: | |
410 | log_info("Successfully wrote Smack onlycap list."); | |
411 | break; | |
412 | default: | |
5e1ee764 | 413 | log_emergency_errno(r, "Failed to write Smack onlycap list: %m"); |
217f95db WC |
414 | return r; |
415 | } | |
416 | ||
e49d3c01 ŁS |
417 | *loaded_policy = true; |
418 | ||
2b3e18de KL |
419 | #endif |
420 | ||
421 | return 0; | |
ffbd2c4d | 422 | } |