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db9ecf05 | 1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
ffbd2c4d | 2 | /*** |
810adae9 | 3 | Copyright © 2013 Intel Corporation |
ffbd2c4d NC |
4 | Authors: |
5 | Nathaniel Chen <nathaniel.chen@intel.com> | |
ffbd2c4d NC |
6 | ***/ |
7 | ||
ffbd2c4d | 8 | #include <errno.h> |
ffbd2c4d | 9 | #include <fcntl.h> |
07630cea LP |
10 | #include <stdio.h> |
11 | #include <stdlib.h> | |
ca78ad1d | 12 | #include <unistd.h> |
ffbd2c4d | 13 | |
ad5db940 OJ |
14 | #include "sd-messages.h" |
15 | ||
b5efdb8a | 16 | #include "alloc-util.h" |
a0956174 | 17 | #include "dirent-util.h" |
3ffd4af2 | 18 | #include "fd-util.h" |
8b197c3a | 19 | #include "fileio.h" |
ffbd2c4d | 20 | #include "log.h" |
07630cea | 21 | #include "macro.h" |
3ffd4af2 | 22 | #include "smack-setup.h" |
07630cea | 23 | #include "string-util.h" |
ffbd2c4d | 24 | |
f9fa32f0 | 25 | #if ENABLE_SMACK |
2b3e18de | 26 | |
b636d78a ZJS |
27 | static int fdopen_unlocked_at(int dfd, const char *dir, const char *name, int *status, FILE **ret_file) { |
28 | int fd, r; | |
29 | FILE *f; | |
30 | ||
31 | fd = openat(dfd, name, O_RDONLY|O_CLOEXEC); | |
32 | if (fd < 0) { | |
33 | if (*status == 0) | |
34 | *status = -errno; | |
35 | ||
36 | return log_warning_errno(errno, "Failed to open \"%s/%s\": %m", dir, name); | |
37 | } | |
38 | ||
39 | r = fdopen_unlocked(fd, "r", &f); | |
40 | if (r < 0) { | |
41 | if (*status == 0) | |
42 | *status = r; | |
43 | ||
44 | safe_close(fd); | |
45 | return log_error_errno(r, "Failed to open \"%s/%s\": %m", dir, name); | |
46 | } | |
47 | ||
48 | *ret_file = f; | |
49 | return 0; | |
50 | } | |
51 | ||
52 | static int write_access2_rules(const char *srcdir) { | |
254d1313 | 53 | _cleanup_close_ int load2_fd = -EBADF, change_fd = -EBADF; |
ffbd2c4d | 54 | _cleanup_closedir_ DIR *dir = NULL; |
254d1313 | 55 | int dfd = -EBADF, r = 0; |
ffbd2c4d | 56 | |
6656aefb WC |
57 | load2_fd = open("/sys/fs/smackfs/load2", O_RDWR|O_CLOEXEC|O_NONBLOCK|O_NOCTTY); |
58 | if (load2_fd < 0) { | |
59 | if (errno != ENOENT) | |
60 | log_warning_errno(errno, "Failed to open '/sys/fs/smackfs/load2': %m"); | |
61 | return -errno; /* negative error */ | |
62 | } | |
63 | ||
64 | change_fd = open("/sys/fs/smackfs/change-rule", O_RDWR|O_CLOEXEC|O_NONBLOCK|O_NOCTTY); | |
65 | if (change_fd < 0) { | |
a4783bd1 | 66 | if (errno != ENOENT) |
6656aefb | 67 | log_warning_errno(errno, "Failed to open '/sys/fs/smackfs/change-rule': %m"); |
a4783bd1 | 68 | return -errno; /* negative error */ |
ffbd2c4d NC |
69 | } |
70 | ||
6656aefb | 71 | /* write rules to load2 or change-rule from every file in the directory */ |
a4783bd1 | 72 | dir = opendir(srcdir); |
ffbd2c4d | 73 | if (!dir) { |
a4783bd1 | 74 | if (errno != ENOENT) |
6656aefb | 75 | log_warning_errno(errno, "Failed to opendir '%s': %m", srcdir); |
a4783bd1 | 76 | return errno; /* positive on purpose */ |
ffbd2c4d NC |
77 | } |
78 | ||
79 | dfd = dirfd(dir); | |
fea7838e | 80 | assert(dfd >= 0); |
ffbd2c4d NC |
81 | |
82 | FOREACH_DIRENT(entry, dir, return 0) { | |
83 | _cleanup_fclose_ FILE *policy = NULL; | |
ffbd2c4d | 84 | |
6656aefb WC |
85 | if (!dirent_is_file(entry)) |
86 | continue; | |
87 | ||
b636d78a | 88 | if (fdopen_unlocked_at(dfd, srcdir, entry->d_name, &r, &policy) < 0) |
ffbd2c4d | 89 | continue; |
ffbd2c4d | 90 | |
ffbd2c4d | 91 | /* load2 write rules in the kernel require a line buffered stream */ |
ea8b6526 LP |
92 | for (;;) { |
93 | _cleanup_free_ char *buf = NULL, *sbj = NULL, *obj = NULL, *acc1 = NULL, *acc2 = NULL; | |
94 | int q; | |
6656aefb | 95 | |
ea8b6526 LP |
96 | q = read_line(policy, NAME_MAX, &buf); |
97 | if (q < 0) | |
98 | return log_error_errno(q, "Failed to read line from '%s': %m", entry->d_name); | |
99 | if (q == 0) | |
100 | break; | |
6656aefb | 101 | |
ea8b6526 | 102 | if (isempty(buf) || strchr(COMMENTS, buf[0])) |
6656aefb WC |
103 | continue; |
104 | ||
105 | /* if 3 args -> load rule : subject object access1 */ | |
106 | /* if 4 args -> change rule : subject object access1 access2 */ | |
107 | if (sscanf(buf, "%ms %ms %ms %ms", &sbj, &obj, &acc1, &acc2) < 3) { | |
108 | log_error_errno(errno, "Failed to parse rule '%s' in '%s', ignoring.", buf, entry->d_name); | |
109 | continue; | |
110 | } | |
111 | ||
112 | if (write(isempty(acc2) ? load2_fd : change_fd, buf, strlen(buf)) < 0) { | |
a4783bd1 | 113 | if (r == 0) |
6656aefb | 114 | r = -errno; |
5e1ee764 | 115 | log_error_errno(errno, "Failed to write '%s' to '%s' in '%s': %m", |
6656aefb | 116 | buf, isempty(acc2) ? "/sys/fs/smackfs/load2" : "/sys/fs/smackfs/change-rule", entry->d_name); |
a4783bd1 | 117 | } |
6656aefb WC |
118 | } |
119 | } | |
120 | ||
121 | return r; | |
122 | } | |
123 | ||
b636d78a | 124 | static int write_cipso2_rules(const char *srcdir) { |
254d1313 | 125 | _cleanup_close_ int cipso2_fd = -EBADF; |
6656aefb | 126 | _cleanup_closedir_ DIR *dir = NULL; |
254d1313 | 127 | int dfd = -EBADF, r = 0; |
6656aefb WC |
128 | |
129 | cipso2_fd = open("/sys/fs/smackfs/cipso2", O_RDWR|O_CLOEXEC|O_NONBLOCK|O_NOCTTY); | |
130 | if (cipso2_fd < 0) { | |
131 | if (errno != ENOENT) | |
132 | log_warning_errno(errno, "Failed to open '/sys/fs/smackfs/cipso2': %m"); | |
133 | return -errno; /* negative error */ | |
134 | } | |
135 | ||
136 | /* write rules to cipso2 from every file in the directory */ | |
137 | dir = opendir(srcdir); | |
138 | if (!dir) { | |
139 | if (errno != ENOENT) | |
140 | log_warning_errno(errno, "Failed to opendir '%s': %m", srcdir); | |
141 | return errno; /* positive on purpose */ | |
142 | } | |
143 | ||
144 | dfd = dirfd(dir); | |
145 | assert(dfd >= 0); | |
146 | ||
147 | FOREACH_DIRENT(entry, dir, return 0) { | |
6656aefb WC |
148 | _cleanup_fclose_ FILE *policy = NULL; |
149 | ||
150 | if (!dirent_is_file(entry)) | |
151 | continue; | |
152 | ||
b636d78a | 153 | if (fdopen_unlocked_at(dfd, srcdir, entry->d_name, &r, &policy) < 0) |
6656aefb | 154 | continue; |
6656aefb WC |
155 | |
156 | /* cipso2 write rules in the kernel require a line buffered stream */ | |
ea8b6526 LP |
157 | for (;;) { |
158 | _cleanup_free_ char *buf = NULL; | |
159 | int q; | |
160 | ||
161 | q = read_line(policy, NAME_MAX, &buf); | |
162 | if (q < 0) | |
163 | return log_error_errno(q, "Failed to read line from '%s': %m", entry->d_name); | |
164 | if (q == 0) | |
165 | break; | |
6656aefb | 166 | |
ea8b6526 | 167 | if (isempty(buf) || strchr(COMMENTS, buf[0])) |
6656aefb WC |
168 | continue; |
169 | ||
170 | if (write(cipso2_fd, buf, strlen(buf)) < 0) { | |
a4783bd1 ZJS |
171 | if (r == 0) |
172 | r = -errno; | |
5e1ee764 | 173 | log_error_errno(errno, "Failed to write '%s' to '/sys/fs/smackfs/cipso2' in '%s': %m", |
6656aefb | 174 | buf, entry->d_name); |
a4783bd1 ZJS |
175 | break; |
176 | } | |
ffbd2c4d NC |
177 | } |
178 | } | |
179 | ||
6656aefb | 180 | return r; |
a4783bd1 ZJS |
181 | } |
182 | ||
b636d78a | 183 | static int write_netlabel_rules(const char *srcdir) { |
ae176752 CS |
184 | _cleanup_fclose_ FILE *dst = NULL; |
185 | _cleanup_closedir_ DIR *dir = NULL; | |
254d1313 | 186 | int dfd = -EBADF, r = 0; |
ae176752 CS |
187 | |
188 | dst = fopen("/sys/fs/smackfs/netlabel", "we"); | |
189 | if (!dst) { | |
190 | if (errno != ENOENT) | |
191 | log_warning_errno(errno, "Failed to open /sys/fs/smackfs/netlabel: %m"); | |
192 | return -errno; /* negative error */ | |
193 | } | |
194 | ||
195 | /* write rules to dst from every file in the directory */ | |
196 | dir = opendir(srcdir); | |
197 | if (!dir) { | |
198 | if (errno != ENOENT) | |
199 | log_warning_errno(errno, "Failed to opendir %s: %m", srcdir); | |
200 | return errno; /* positive on purpose */ | |
201 | } | |
202 | ||
203 | dfd = dirfd(dir); | |
204 | assert(dfd >= 0); | |
205 | ||
206 | FOREACH_DIRENT(entry, dir, return 0) { | |
ae176752 CS |
207 | _cleanup_fclose_ FILE *policy = NULL; |
208 | ||
b636d78a | 209 | if (fdopen_unlocked_at(dfd, srcdir, entry->d_name, &r, &policy) < 0) |
ae176752 | 210 | continue; |
0d536673 | 211 | |
ae176752 | 212 | /* load2 write rules in the kernel require a line buffered stream */ |
ea8b6526 LP |
213 | for (;;) { |
214 | _cleanup_free_ char *buf = NULL; | |
0d536673 LP |
215 | int q; |
216 | ||
ea8b6526 LP |
217 | q = read_line(policy, NAME_MAX, &buf); |
218 | if (q < 0) | |
219 | return log_error_errno(q, "Failed to read line from %s: %m", entry->d_name); | |
220 | if (q == 0) | |
221 | break; | |
222 | ||
0d536673 | 223 | if (!fputs(buf, dst)) { |
ae176752 CS |
224 | if (r == 0) |
225 | r = -EINVAL; | |
5e1ee764 | 226 | log_error_errno(errno, "Failed to write line to /sys/fs/smackfs/netlabel: %m"); |
ae176752 CS |
227 | break; |
228 | } | |
0d536673 LP |
229 | q = fflush_and_check(dst); |
230 | if (q < 0) { | |
ae176752 | 231 | if (r == 0) |
0d536673 LP |
232 | r = q; |
233 | log_error_errno(q, "Failed to flush writes to /sys/fs/smackfs/netlabel: %m"); | |
ae176752 CS |
234 | break; |
235 | } | |
236 | } | |
237 | } | |
238 | ||
7f508f2c | 239 | return r; |
ae176752 CS |
240 | } |
241 | ||
217f95db | 242 | static int write_onlycap_list(void) { |
254d1313 | 243 | _cleanup_close_ int onlycap_fd = -EBADF; |
217f95db WC |
244 | _cleanup_free_ char *list = NULL; |
245 | _cleanup_fclose_ FILE *f = NULL; | |
319a4f4b | 246 | size_t len = 0; |
217f95db WC |
247 | int r; |
248 | ||
249 | f = fopen("/etc/smack/onlycap", "re"); | |
250 | if (!f) { | |
251 | if (errno != ENOENT) | |
9fd0b029 LP |
252 | log_warning_errno(errno, "Failed to read '/etc/smack/onlycap': %m"); |
253 | ||
217f95db WC |
254 | return errno == ENOENT ? ENOENT : -errno; |
255 | } | |
256 | ||
ea8b6526 LP |
257 | for (;;) { |
258 | _cleanup_free_ char *buf = NULL; | |
217f95db WC |
259 | size_t l; |
260 | ||
ea8b6526 LP |
261 | r = read_line(f, LONG_LINE_MAX, &buf); |
262 | if (r < 0) | |
263 | return log_error_errno(r, "Failed to read line from /etc/smack/onlycap: %m"); | |
264 | if (r == 0) | |
265 | break; | |
266 | ||
267 | if (isempty(buf) || strchr(COMMENTS, *buf)) | |
217f95db WC |
268 | continue; |
269 | ||
270 | l = strlen(buf); | |
319a4f4b | 271 | if (!GREEDY_REALLOC(list, len + l + 1)) |
217f95db WC |
272 | return log_oom(); |
273 | ||
274 | stpcpy(list + len, buf)[0] = ' '; | |
275 | len += l + 1; | |
276 | } | |
277 | ||
9fd0b029 | 278 | if (len == 0) |
217f95db WC |
279 | return 0; |
280 | ||
281 | list[len - 1] = 0; | |
282 | ||
283 | onlycap_fd = open("/sys/fs/smackfs/onlycap", O_WRONLY|O_CLOEXEC|O_NONBLOCK|O_NOCTTY); | |
284 | if (onlycap_fd < 0) { | |
285 | if (errno != ENOENT) | |
9fd0b029 | 286 | log_warning_errno(errno, "Failed to open '/sys/fs/smackfs/onlycap': %m"); |
217f95db WC |
287 | return -errno; /* negative error */ |
288 | } | |
289 | ||
290 | r = write(onlycap_fd, list, len); | |
291 | if (r < 0) | |
9fd0b029 | 292 | return log_error_errno(errno, "Failed to write onlycap list(%s) to '/sys/fs/smackfs/onlycap': %m", list); |
217f95db WC |
293 | |
294 | return 0; | |
295 | } | |
296 | ||
2b3e18de | 297 | #endif |
ffbd2c4d | 298 | |
8a188de9 | 299 | int mac_smack_setup(bool *loaded_policy) { |
2b3e18de | 300 | |
f9fa32f0 | 301 | #if ENABLE_SMACK |
2b3e18de | 302 | |
a4783bd1 ZJS |
303 | int r; |
304 | ||
e49d3c01 ŁS |
305 | assert(loaded_policy); |
306 | ||
6656aefb | 307 | r = write_access2_rules("/etc/smack/accesses.d/"); |
79893116 | 308 | switch (r) { |
a4783bd1 ZJS |
309 | case -ENOENT: |
310 | log_debug("Smack is not enabled in the kernel."); | |
311 | return 0; | |
312 | case ENOENT: | |
6656aefb | 313 | log_debug("Smack access rules directory '/etc/smack/accesses.d/' not found"); |
a4783bd1 ZJS |
314 | return 0; |
315 | case 0: | |
316 | log_info("Successfully loaded Smack policies."); | |
abbacb1d NC |
317 | break; |
318 | default: | |
e53fc357 | 319 | log_warning_errno(r, "Failed to load Smack access rules, ignoring: %m"); |
abbacb1d NC |
320 | return 0; |
321 | } | |
322 | ||
07b382cc | 323 | #if HAVE_SMACK_RUN_LABEL |
57512c89 | 324 | r = write_string_file("/proc/self/attr/current", SMACK_RUN_LABEL, WRITE_STRING_FILE_DISABLE_BUFFER); |
ae176752 CS |
325 | if (r < 0) |
326 | log_warning_errno(r, "Failed to set SMACK label \"" SMACK_RUN_LABEL "\" on self: %m"); | |
57512c89 | 327 | r = write_string_file("/sys/fs/smackfs/ambient", SMACK_RUN_LABEL, WRITE_STRING_FILE_DISABLE_BUFFER); |
ae176752 CS |
328 | if (r < 0) |
329 | log_warning_errno(r, "Failed to set SMACK ambient label \"" SMACK_RUN_LABEL "\": %m"); | |
330 | r = write_string_file("/sys/fs/smackfs/netlabel", | |
57512c89 | 331 | "0.0.0.0/0 " SMACK_RUN_LABEL, WRITE_STRING_FILE_DISABLE_BUFFER); |
ae176752 CS |
332 | if (r < 0) |
333 | log_warning_errno(r, "Failed to set SMACK netlabel rule \"0.0.0.0/0 " SMACK_RUN_LABEL "\": %m"); | |
57512c89 | 334 | r = write_string_file("/sys/fs/smackfs/netlabel", "127.0.0.1 -CIPSO", WRITE_STRING_FILE_DISABLE_BUFFER); |
ae176752 CS |
335 | if (r < 0) |
336 | log_warning_errno(r, "Failed to set SMACK netlabel rule \"127.0.0.1 -CIPSO\": %m"); | |
8b197c3a AK |
337 | #endif |
338 | ||
6656aefb | 339 | r = write_cipso2_rules("/etc/smack/cipso.d/"); |
79893116 | 340 | switch (r) { |
abbacb1d NC |
341 | case -ENOENT: |
342 | log_debug("Smack/CIPSO is not enabled in the kernel."); | |
343 | return 0; | |
344 | case ENOENT: | |
6656aefb | 345 | log_debug("Smack/CIPSO access rules directory '/etc/smack/cipso.d/' not found"); |
ae176752 | 346 | break; |
abbacb1d NC |
347 | case 0: |
348 | log_info("Successfully loaded Smack/CIPSO policies."); | |
b9289d4c | 349 | break; |
a4783bd1 | 350 | default: |
e53fc357 | 351 | log_warning_errno(r, "Failed to load Smack/CIPSO access rules, ignoring: %m"); |
ae176752 CS |
352 | break; |
353 | } | |
354 | ||
355 | r = write_netlabel_rules("/etc/smack/netlabel.d/"); | |
79893116 | 356 | switch (r) { |
ae176752 CS |
357 | case -ENOENT: |
358 | log_debug("Smack/CIPSO is not enabled in the kernel."); | |
a4783bd1 | 359 | return 0; |
ae176752 CS |
360 | case ENOENT: |
361 | log_debug("Smack network host rules directory '/etc/smack/netlabel.d/' not found"); | |
362 | break; | |
363 | case 0: | |
364 | log_info("Successfully loaded Smack network host rules."); | |
365 | break; | |
366 | default: | |
367 | log_warning_errno(r, "Failed to load Smack network host rules: %m, ignoring."); | |
368 | break; | |
a4783bd1 | 369 | } |
2b3e18de | 370 | |
217f95db | 371 | r = write_onlycap_list(); |
79893116 | 372 | switch (r) { |
217f95db WC |
373 | case -ENOENT: |
374 | log_debug("Smack is not enabled in the kernel."); | |
375 | break; | |
376 | case ENOENT: | |
377 | log_debug("Smack onlycap list file '/etc/smack/onlycap' not found"); | |
378 | break; | |
379 | case 0: | |
380 | log_info("Successfully wrote Smack onlycap list."); | |
381 | break; | |
382 | default: | |
ad5db940 OJ |
383 | return log_struct_errno(LOG_EMERG, r, |
384 | LOG_MESSAGE("Failed to write Smack onlycap list: %m"), | |
385 | "MESSAGE_ID=" SD_MESSAGE_SMACK_FAILED_WRITE_STR); | |
217f95db WC |
386 | } |
387 | ||
e49d3c01 ŁS |
388 | *loaded_policy = true; |
389 | ||
2b3e18de KL |
390 | #endif |
391 | ||
392 | return 0; | |
ffbd2c4d | 393 | } |