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Commit | Line | Data |
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db9ecf05 | 1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
cad45ba1 | 2 | |
66b6d9d5 | 3 | #include <errno.h> |
ca78ad1d | 4 | #include <fcntl.h> |
66b6d9d5 | 5 | #include <malloc.h> |
11c3a366 TA |
6 | #include <stddef.h> |
7 | #include <string.h> | |
8 | #include <sys/stat.h> | |
9 | #include <sys/time.h> | |
ca78ad1d | 10 | #include <sys/types.h> |
66b6d9d5 | 11 | #include <sys/un.h> |
11c3a366 | 12 | #include <syslog.h> |
a07e9cfb | 13 | |
349cc4a5 | 14 | #if HAVE_SELINUX |
61f3e897 | 15 | #include <selinux/avc.h> |
66b6d9d5 | 16 | #include <selinux/context.h> |
cf0fbc49 TA |
17 | #include <selinux/label.h> |
18 | #include <selinux/selinux.h> | |
66b6d9d5 WC |
19 | #endif |
20 | ||
b5efdb8a | 21 | #include "alloc-util.h" |
2b2fec7d | 22 | #include "errno-util.h" |
08c84981 | 23 | #include "fd-util.h" |
11c3a366 TA |
24 | #include "log.h" |
25 | #include "macro.h" | |
93cc7779 TA |
26 | #include "path-util.h" |
27 | #include "selinux-util.h" | |
08c84981 | 28 | #include "stdio-util.h" |
11c3a366 | 29 | #include "time-util.h" |
cad45ba1 | 30 | |
349cc4a5 | 31 | #if HAVE_SELINUX |
fd421c4a | 32 | DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(context_t, context_free, NULL); |
66b6d9d5 | 33 | #define _cleanup_context_free_ _cleanup_(context_freep) |
0b6018f3 | 34 | |
61f3e897 CG |
35 | static int mac_selinux_reload(int seqno); |
36 | ||
6baa7db0 | 37 | static int cached_use = -1; |
fd5e402f CG |
38 | static bool initialized = false; |
39 | static int (*enforcing_status_func)(void) = security_getenforce; | |
40 | static int last_policyload = 0; | |
66b6d9d5 | 41 | static struct selabel_handle *label_hnd = NULL; |
66cedb30 | 42 | |
3cd44590 | 43 | #define log_enforcing(...) \ |
fd5e402f | 44 | log_full(mac_selinux_enforcing() ? LOG_ERR : LOG_WARNING, __VA_ARGS__) |
65804d6a LP |
45 | |
46 | #define log_enforcing_errno(error, ...) \ | |
47 | ({ \ | |
fd5e402f | 48 | bool _enforcing = mac_selinux_enforcing(); \ |
65804d6a LP |
49 | int _level = _enforcing ? LOG_ERR : LOG_WARNING; \ |
50 | int _e = (error); \ | |
51 | \ | |
52 | int _r = (log_get_max_level() >= LOG_PRI(_level)) \ | |
10d296c1 | 53 | ? log_internal(_level, _e, PROJECT_FILE, __LINE__, __func__, __VA_ARGS__) \ |
65804d6a LP |
54 | : -ERRNO_VALUE(_e); \ |
55 | _enforcing ? _r : 0; \ | |
56 | }) | |
66b6d9d5 | 57 | #endif |
cad45ba1 | 58 | |
6d395665 | 59 | bool mac_selinux_use(void) { |
349cc4a5 | 60 | #if HAVE_SELINUX |
2073bf3f | 61 | if (_unlikely_(cached_use < 0)) { |
6baa7db0 | 62 | cached_use = is_selinux_enabled() > 0; |
2073bf3f CG |
63 | log_debug("SELinux enabled state cached to: %s", cached_use ? "enabled" : "disabled"); |
64 | } | |
cad45ba1 | 65 | |
6baa7db0 | 66 | return cached_use; |
66b6d9d5 WC |
67 | #else |
68 | return false; | |
69 | #endif | |
cad45ba1 LP |
70 | } |
71 | ||
fd5e402f CG |
72 | bool mac_selinux_enforcing(void) { |
73 | #if HAVE_SELINUX | |
74 | return enforcing_status_func() != 0; | |
75 | #else | |
76 | return false; | |
77 | #endif | |
78 | } | |
79 | ||
6baa7db0 | 80 | void mac_selinux_retest(void) { |
349cc4a5 | 81 | #if HAVE_SELINUX |
6baa7db0 | 82 | cached_use = -1; |
66b6d9d5 | 83 | #endif |
cad45ba1 | 84 | } |
0b6018f3 | 85 | |
349cc4a5 | 86 | #if HAVE_SELINUX |
4b6f74f5 ZJS |
87 | # if HAVE_MALLINFO |
88 | static struct mallinfo mallinfo_nowarn(void) { | |
89 | /* glibc has deprecated mallinfo(), but the replacement malloc_info() returns an XML blob ;=[ */ | |
90 | DISABLE_WARNING_DEPRECATED_DECLARATIONS | |
91 | return mallinfo(); | |
92 | REENABLE_WARNING | |
93 | } | |
94 | # else | |
95 | # warning "mallinfo() is missing, add mallinfo2() supported instead." | |
96 | # endif | |
97 | ||
fd5e402f CG |
98 | static int open_label_db(void) { |
99 | struct selabel_handle *hnd; | |
66b6d9d5 | 100 | usec_t before_timestamp, after_timestamp; |
65804d6a | 101 | char timespan[FORMAT_TIMESPAN_MAX]; |
66b6d9d5 | 102 | |
4b6f74f5 ZJS |
103 | # if HAVE_MALLINFO |
104 | struct mallinfo before_mallinfo = mallinfo_nowarn(); | |
105 | # endif | |
66b6d9d5 WC |
106 | before_timestamp = now(CLOCK_MONOTONIC); |
107 | ||
fd5e402f CG |
108 | hnd = selabel_open(SELABEL_CTX_FILE, NULL, 0); |
109 | if (!hnd) | |
a9ba0e32 | 110 | return log_enforcing_errno(errno, "Failed to initialize SELinux labeling handle: %m"); |
66b6d9d5 | 111 | |
65804d6a | 112 | after_timestamp = now(CLOCK_MONOTONIC); |
4b6f74f5 ZJS |
113 | # if HAVE_MALLINFO |
114 | struct mallinfo after_mallinfo = mallinfo_nowarn(); | |
115 | int l = after_mallinfo.uordblks > before_mallinfo.uordblks ? after_mallinfo.uordblks - before_mallinfo.uordblks : 0; | |
65804d6a LP |
116 | log_debug("Successfully loaded SELinux database in %s, size on heap is %iK.", |
117 | format_timespan(timespan, sizeof(timespan), after_timestamp - before_timestamp, 0), | |
4b6f74f5 ZJS |
118 | DIV_ROUND_UP(l, 1024)); |
119 | # else | |
120 | log_debug("Successfully loaded SELinux database in %s.", | |
121 | format_timespan(timespan, sizeof(timespan), after_timestamp - before_timestamp, 0)); | |
122 | # endif | |
66b6d9d5 | 123 | |
fd5e402f CG |
124 | /* release memory after measurement */ |
125 | if (label_hnd) | |
126 | selabel_close(label_hnd); | |
127 | label_hnd = TAKE_PTR(hnd); | |
128 | ||
129 | return 0; | |
130 | } | |
131 | #endif | |
132 | ||
133 | int mac_selinux_init(void) { | |
134 | #if HAVE_SELINUX | |
135 | int r; | |
961b341e | 136 | bool have_status_page = false; |
fd5e402f CG |
137 | |
138 | if (initialized) | |
139 | return 0; | |
140 | ||
141 | if (!mac_selinux_use()) | |
142 | return 0; | |
143 | ||
961b341e ZJS |
144 | r = selinux_status_open(/* netlink fallback */ 1); |
145 | if (r < 0) { | |
146 | if (!ERRNO_IS_PRIVILEGE(errno)) | |
147 | return log_enforcing_errno(errno, "Failed to open SELinux status page: %m"); | |
148 | log_warning_errno(errno, "selinux_status_open() with netlink fallback failed, not checking for policy reloads: %m"); | |
149 | } else if (r == 1) | |
150 | log_warning("selinux_status_open() failed to open the status page, using the netlink fallback."); | |
151 | else | |
152 | have_status_page = true; | |
fd5e402f CG |
153 | |
154 | r = open_label_db(); | |
155 | if (r < 0) { | |
156 | selinux_status_close(); | |
157 | return r; | |
158 | } | |
159 | ||
961b341e ZJS |
160 | /* Save the current policyload sequence number, so mac_selinux_maybe_reload() does not trigger on |
161 | * first call without any actual change. */ | |
fd5e402f CG |
162 | last_policyload = selinux_status_policyload(); |
163 | ||
961b341e ZJS |
164 | if (have_status_page) |
165 | /* Now that the SELinux status page has been successfully opened, retrieve the enforcing | |
166 | * status over it (to avoid system calls in security_getenforce()). */ | |
167 | enforcing_status_func = selinux_status_getenforce; | |
fd5e402f CG |
168 | |
169 | initialized = true; | |
65804d6a LP |
170 | #endif |
171 | return 0; | |
d682b3a7 LP |
172 | } |
173 | ||
fd5e402f CG |
174 | void mac_selinux_maybe_reload(void) { |
175 | #if HAVE_SELINUX | |
176 | int r; | |
177 | ||
1006038c CG |
178 | if (!initialized) |
179 | return; | |
180 | ||
fd5e402f CG |
181 | r = selinux_status_updated(); |
182 | if (r < 0) | |
183 | log_debug_errno(errno, "Failed to update SELinux from status page: %m"); | |
184 | if (r > 0) { | |
185 | int policyload; | |
186 | ||
187 | log_debug("SELinux status page update"); | |
188 | ||
189 | /* from libselinux > 3.1 callbacks gets automatically called, see | |
190 | https://github.com/SELinuxProject/selinux/commit/05bdc03130d741e53e1fb45a958d0a2c184be503 */ | |
191 | ||
192 | /* only reload on policy changes, not enforcing status changes */ | |
193 | policyload = selinux_status_policyload(); | |
194 | if (policyload != last_policyload) { | |
195 | mac_selinux_reload(policyload); | |
196 | last_policyload = policyload; | |
197 | } | |
198 | } | |
199 | #endif | |
200 | } | |
201 | ||
ecabcf8b LP |
202 | void mac_selinux_finish(void) { |
203 | ||
349cc4a5 | 204 | #if HAVE_SELINUX |
fd5e402f CG |
205 | if (label_hnd) { |
206 | selabel_close(label_hnd); | |
207 | label_hnd = NULL; | |
208 | } | |
209 | ||
210 | enforcing_status_func = security_getenforce; | |
ecabcf8b | 211 | |
fd5e402f CG |
212 | selinux_status_close(); |
213 | ||
214 | initialized = false; | |
ecabcf8b LP |
215 | #endif |
216 | } | |
217 | ||
a9dfac21 | 218 | #if HAVE_SELINUX |
61f3e897 | 219 | static int mac_selinux_reload(int seqno) { |
fd5e402f | 220 | log_debug("SELinux reload %d", seqno); |
a9dfac21 | 221 | |
fd5e402f | 222 | (void) open_label_db(); |
61f3e897 CG |
223 | |
224 | return 0; | |
a9dfac21 | 225 | } |
61f3e897 | 226 | #endif |
a9dfac21 | 227 | |
c3151977 | 228 | int mac_selinux_fix_container(const char *path, const char *inside_path, LabelFixFlags flags) { |
66b6d9d5 | 229 | |
9271daee LP |
230 | assert(path); |
231 | assert(inside_path); | |
232 | ||
349cc4a5 | 233 | #if HAVE_SELINUX |
08c84981 | 234 | _cleanup_close_ int fd = -1; |
5dfc5461 LP |
235 | |
236 | /* if mac_selinux_init() wasn't called before we are a NOOP */ | |
66b6d9d5 WC |
237 | if (!label_hnd) |
238 | return 0; | |
239 | ||
08c84981 LP |
240 | /* Open the file as O_PATH, to pin it while we determine and adjust the label */ |
241 | fd = open(path, O_NOFOLLOW|O_CLOEXEC|O_PATH); | |
242 | if (fd < 0) { | |
243 | if ((flags & LABEL_IGNORE_ENOENT) && errno == ENOENT) | |
244 | return 0; | |
245 | ||
246 | return -errno; | |
247 | } | |
248 | ||
9271daee LP |
249 | return mac_selinux_fix_container_fd(fd, path, inside_path, flags); |
250 | #endif | |
251 | ||
252 | return 0; | |
253 | } | |
254 | ||
255 | int mac_selinux_fix_container_fd(int fd, const char *path, const char *inside_path, LabelFixFlags flags) { | |
256 | ||
257 | assert(fd >= 0); | |
258 | assert(inside_path); | |
259 | ||
260 | #if HAVE_SELINUX | |
261 | char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)]; | |
262 | _cleanup_freecon_ char* fcon = NULL; | |
263 | struct stat st; | |
264 | int r; | |
265 | ||
266 | /* if mac_selinux_init() wasn't called before we are a NOOP */ | |
267 | if (!label_hnd) | |
268 | return 0; | |
269 | ||
08c84981 LP |
270 | if (fstat(fd, &st) < 0) |
271 | return -errno; | |
5dfc5461 | 272 | |
61f3e897 | 273 | /* Check for policy reload so 'label_hnd' is kept up-to-date by callbacks */ |
fd5e402f | 274 | mac_selinux_maybe_reload(); |
61f3e897 | 275 | |
c3151977 | 276 | if (selabel_lookup_raw(label_hnd, &fcon, inside_path, st.st_mode) < 0) { |
66b6d9d5 | 277 | /* If there's no label to set, then exit without warning */ |
9271daee | 278 | if (errno == ENOENT) |
66b6d9d5 WC |
279 | return 0; |
280 | ||
9271daee | 281 | r = -errno; |
08c84981 | 282 | goto fail; |
66b6d9d5 WC |
283 | } |
284 | ||
08c84981 LP |
285 | xsprintf(procfs_path, "/proc/self/fd/%i", fd); |
286 | if (setfilecon_raw(procfs_path, fcon) < 0) { | |
287 | _cleanup_freecon_ char *oldcon = NULL; | |
288 | ||
08c84981 | 289 | /* If the FS doesn't support labels, then exit without warning */ |
9271daee | 290 | if (ERRNO_IS_NOT_SUPPORTED(errno)) |
66b6d9d5 WC |
291 | return 0; |
292 | ||
08c84981 | 293 | /* It the FS is read-only and we were told to ignore failures caused by that, suppress error */ |
9271daee | 294 | if (errno == EROFS && (flags & LABEL_IGNORE_EROFS)) |
66b6d9d5 WC |
295 | return 0; |
296 | ||
9271daee LP |
297 | r = -errno; |
298 | ||
08c84981 LP |
299 | /* If the old label is identical to the new one, suppress any kind of error */ |
300 | if (getfilecon_raw(procfs_path, &oldcon) >= 0 && streq(fcon, oldcon)) | |
301 | return 0; | |
302 | ||
303 | goto fail; | |
66b6d9d5 | 304 | } |
08c84981 LP |
305 | |
306 | return 0; | |
307 | ||
308 | fail: | |
9271daee | 309 | return log_enforcing_errno(r, "Unable to fix SELinux security context of %s (%s): %m", strna(path), strna(inside_path)); |
66b6d9d5 WC |
310 | #endif |
311 | ||
ecabcf8b | 312 | return 0; |
66b6d9d5 WC |
313 | } |
314 | ||
ecabcf8b | 315 | int mac_selinux_apply(const char *path, const char *label) { |
66b6d9d5 | 316 | |
9271daee LP |
317 | assert(path); |
318 | ||
349cc4a5 | 319 | #if HAVE_SELINUX |
ecabcf8b LP |
320 | if (!mac_selinux_use()) |
321 | return 0; | |
322 | ||
0f474365 LP |
323 | assert(label); |
324 | ||
65804d6a LP |
325 | if (setfilecon(path, label) < 0) |
326 | return log_enforcing_errno(errno, "Failed to set SELinux security context %s on path %s: %m", label, path); | |
66b6d9d5 | 327 | #endif |
ecabcf8b | 328 | return 0; |
d682b3a7 LP |
329 | } |
330 | ||
9271daee LP |
331 | int mac_selinux_apply_fd(int fd, const char *path, const char *label) { |
332 | ||
333 | assert(fd >= 0); | |
334 | ||
335 | #if HAVE_SELINUX | |
336 | if (!mac_selinux_use()) | |
337 | return 0; | |
338 | ||
339 | assert(label); | |
340 | ||
341 | if (fsetfilecon(fd, label) < 0) | |
342 | return log_enforcing_errno(errno, "Failed to set SELinux security context %s on path %s: %m", label, strna(path)); | |
343 | #endif | |
344 | return 0; | |
345 | } | |
346 | ||
cc56fafe | 347 | int mac_selinux_get_create_label_from_exe(const char *exe, char **label) { |
349cc4a5 | 348 | #if HAVE_SELINUX |
2ed96880 | 349 | _cleanup_freecon_ char *mycon = NULL, *fcon = NULL; |
66b6d9d5 | 350 | security_class_t sclass; |
65804d6a | 351 | int r; |
66b6d9d5 | 352 | |
7f416dae LP |
353 | assert(exe); |
354 | assert(label); | |
355 | ||
6d395665 | 356 | if (!mac_selinux_use()) |
7f416dae | 357 | return -EOPNOTSUPP; |
66b6d9d5 | 358 | |
24154879 | 359 | r = getcon_raw(&mycon); |
66b6d9d5 | 360 | if (r < 0) |
7f416dae | 361 | return -errno; |
66b6d9d5 | 362 | |
24154879 | 363 | r = getfilecon_raw(exe, &fcon); |
66b6d9d5 | 364 | if (r < 0) |
7f416dae | 365 | return -errno; |
66b6d9d5 WC |
366 | |
367 | sclass = string_to_security_class("process"); | |
fdb0405e CG |
368 | if (sclass == 0) |
369 | return -ENOSYS; | |
370 | ||
2ed96880 | 371 | r = security_compute_create_raw(mycon, fcon, sclass, label); |
7f416dae LP |
372 | if (r < 0) |
373 | return -errno; | |
66b6d9d5 | 374 | |
65804d6a LP |
375 | return 0; |
376 | #else | |
377 | return -EOPNOTSUPP; | |
378 | #endif | |
66b6d9d5 WC |
379 | } |
380 | ||
cc56fafe | 381 | int mac_selinux_get_our_label(char **label) { |
65804d6a LP |
382 | #if HAVE_SELINUX |
383 | int r; | |
66b6d9d5 | 384 | |
7f416dae LP |
385 | assert(label); |
386 | ||
6d395665 | 387 | if (!mac_selinux_use()) |
7f416dae | 388 | return -EOPNOTSUPP; |
66b6d9d5 | 389 | |
24154879 | 390 | r = getcon_raw(label); |
66b6d9d5 | 391 | if (r < 0) |
7f416dae | 392 | return -errno; |
66b6d9d5 | 393 | |
65804d6a LP |
394 | return 0; |
395 | #else | |
396 | return -EOPNOTSUPP; | |
397 | #endif | |
66b6d9d5 WC |
398 | } |
399 | ||
9008e1ac | 400 | int mac_selinux_get_child_mls_label(int socket_fd, const char *exe, const char *exec_label, char **label) { |
349cc4a5 | 401 | #if HAVE_SELINUX |
2ed96880 | 402 | _cleanup_freecon_ char *mycon = NULL, *peercon = NULL, *fcon = NULL; |
66b6d9d5 WC |
403 | _cleanup_context_free_ context_t pcon = NULL, bcon = NULL; |
404 | security_class_t sclass; | |
66b6d9d5 | 405 | const char *range = NULL; |
65804d6a | 406 | int r; |
66b6d9d5 WC |
407 | |
408 | assert(socket_fd >= 0); | |
409 | assert(exe); | |
410 | assert(label); | |
411 | ||
6d395665 | 412 | if (!mac_selinux_use()) |
7f416dae LP |
413 | return -EOPNOTSUPP; |
414 | ||
24154879 | 415 | r = getcon_raw(&mycon); |
7f416dae LP |
416 | if (r < 0) |
417 | return -errno; | |
66b6d9d5 | 418 | |
a1d2de07 | 419 | r = getpeercon_raw(socket_fd, &peercon); |
7f416dae LP |
420 | if (r < 0) |
421 | return -errno; | |
66b6d9d5 | 422 | |
9008e1ac | 423 | if (!exec_label) { |
66b6d9d5 WC |
424 | /* If there is no context set for next exec let's use context |
425 | of target executable */ | |
24154879 | 426 | r = getfilecon_raw(exe, &fcon); |
7f416dae LP |
427 | if (r < 0) |
428 | return -errno; | |
66b6d9d5 WC |
429 | } |
430 | ||
431 | bcon = context_new(mycon); | |
7f416dae LP |
432 | if (!bcon) |
433 | return -ENOMEM; | |
66b6d9d5 WC |
434 | |
435 | pcon = context_new(peercon); | |
7f416dae LP |
436 | if (!pcon) |
437 | return -ENOMEM; | |
66b6d9d5 WC |
438 | |
439 | range = context_range_get(pcon); | |
7f416dae LP |
440 | if (!range) |
441 | return -errno; | |
66b6d9d5 WC |
442 | |
443 | r = context_range_set(bcon, range); | |
7f416dae LP |
444 | if (r) |
445 | return -errno; | |
66b6d9d5 WC |
446 | |
447 | freecon(mycon); | |
448 | mycon = strdup(context_str(bcon)); | |
7f416dae LP |
449 | if (!mycon) |
450 | return -ENOMEM; | |
66b6d9d5 WC |
451 | |
452 | sclass = string_to_security_class("process"); | |
fdb0405e CG |
453 | if (sclass == 0) |
454 | return -ENOSYS; | |
455 | ||
2ed96880 | 456 | r = security_compute_create_raw(mycon, fcon, sclass, label); |
7f416dae LP |
457 | if (r < 0) |
458 | return -errno; | |
7f416dae | 459 | |
65804d6a LP |
460 | return 0; |
461 | #else | |
462 | return -EOPNOTSUPP; | |
463 | #endif | |
66b6d9d5 WC |
464 | } |
465 | ||
710a6b50 | 466 | char* mac_selinux_free(char *label) { |
ecabcf8b | 467 | |
349cc4a5 | 468 | #if HAVE_SELINUX |
2ed96880 | 469 | freecon(label); |
3d9fbea4 CG |
470 | #else |
471 | assert(!label); | |
ecabcf8b | 472 | #endif |
710a6b50 LP |
473 | |
474 | return NULL; | |
ecabcf8b LP |
475 | } |
476 | ||
349cc4a5 | 477 | #if HAVE_SELINUX |
7e531a52 | 478 | static int selinux_create_file_prepare_abspath(const char *abspath, mode_t mode) { |
2ed96880 | 479 | _cleanup_freecon_ char *filecon = NULL; |
0f474365 | 480 | int r; |
66b6d9d5 | 481 | |
7e531a52 FB |
482 | assert(abspath); |
483 | assert(path_is_absolute(abspath)); | |
c34255bd | 484 | |
61f3e897 | 485 | /* Check for policy reload so 'label_hnd' is kept up-to-date by callbacks */ |
fd5e402f | 486 | mac_selinux_maybe_reload(); |
61f3e897 | 487 | |
7e531a52 | 488 | r = selabel_lookup_raw(label_hnd, &filecon, abspath, mode); |
0f474365 LP |
489 | if (r < 0) { |
490 | /* No context specified by the policy? Proceed without setting it. */ | |
491 | if (errno == ENOENT) | |
492 | return 0; | |
2d58aa46 | 493 | |
65804d6a | 494 | return log_enforcing_errno(errno, "Failed to determine SELinux security context for %s: %m", abspath); |
66b6d9d5 WC |
495 | } |
496 | ||
65804d6a LP |
497 | if (setfscreatecon_raw(filecon) < 0) |
498 | return log_enforcing_errno(errno, "Failed to set SELinux security context %s for %s: %m", filecon, abspath); | |
66b6d9d5 | 499 | |
0f474365 | 500 | return 0; |
66b6d9d5 | 501 | } |
7e531a52 FB |
502 | #endif |
503 | ||
504 | int mac_selinux_create_file_prepare_at(int dirfd, const char *path, mode_t mode) { | |
7e531a52 FB |
505 | #if HAVE_SELINUX |
506 | _cleanup_free_ char *abspath = NULL; | |
65804d6a LP |
507 | int r; |
508 | ||
7e531a52 FB |
509 | |
510 | assert(path); | |
511 | ||
512 | if (!label_hnd) | |
513 | return 0; | |
514 | ||
515 | if (!path_is_absolute(path)) { | |
516 | _cleanup_free_ char *p = NULL; | |
517 | ||
518 | if (dirfd == AT_FDCWD) | |
519 | r = safe_getcwd(&p); | |
520 | else | |
521 | r = fd_get_path(dirfd, &p); | |
522 | if (r < 0) | |
523 | return r; | |
524 | ||
62a85ee0 | 525 | path = abspath = path_join(p, path); |
30016f21 | 526 | if (!path) |
7e531a52 | 527 | return -ENOMEM; |
7e531a52 FB |
528 | } |
529 | ||
65804d6a LP |
530 | return selinux_create_file_prepare_abspath(path, mode); |
531 | #else | |
532 | return 0; | |
7e531a52 | 533 | #endif |
7e531a52 FB |
534 | } |
535 | ||
536 | int mac_selinux_create_file_prepare(const char *path, mode_t mode) { | |
7e531a52 | 537 | #if HAVE_SELINUX |
65804d6a LP |
538 | int r; |
539 | ||
7e531a52 FB |
540 | _cleanup_free_ char *abspath = NULL; |
541 | ||
542 | assert(path); | |
543 | ||
544 | if (!label_hnd) | |
545 | return 0; | |
546 | ||
547 | r = path_make_absolute_cwd(path, &abspath); | |
548 | if (r < 0) | |
549 | return r; | |
550 | ||
65804d6a LP |
551 | return selinux_create_file_prepare_abspath(abspath, mode); |
552 | #else | |
553 | return 0; | |
7e531a52 | 554 | #endif |
7e531a52 | 555 | } |
66b6d9d5 | 556 | |
ecabcf8b | 557 | void mac_selinux_create_file_clear(void) { |
66b6d9d5 | 558 | |
349cc4a5 | 559 | #if HAVE_SELINUX |
66b6d9d5 WC |
560 | PROTECT_ERRNO; |
561 | ||
6baa7db0 | 562 | if (!mac_selinux_use()) |
66b6d9d5 WC |
563 | return; |
564 | ||
a1d2de07 | 565 | setfscreatecon_raw(NULL); |
66b6d9d5 WC |
566 | #endif |
567 | } | |
568 | ||
ecabcf8b | 569 | int mac_selinux_create_socket_prepare(const char *label) { |
66b6d9d5 | 570 | |
349cc4a5 | 571 | #if HAVE_SELINUX |
ecabcf8b LP |
572 | assert(label); |
573 | ||
65804d6a LP |
574 | if (!mac_selinux_use()) |
575 | return 0; | |
ecabcf8b | 576 | |
65804d6a LP |
577 | if (setsockcreatecon(label) < 0) |
578 | return log_enforcing_errno(errno, "Failed to set SELinux security context %s for sockets: %m", label); | |
66b6d9d5 | 579 | #endif |
ecabcf8b LP |
580 | |
581 | return 0; | |
66b6d9d5 WC |
582 | } |
583 | ||
ecabcf8b | 584 | void mac_selinux_create_socket_clear(void) { |
66b6d9d5 | 585 | |
349cc4a5 | 586 | #if HAVE_SELINUX |
ecabcf8b LP |
587 | PROTECT_ERRNO; |
588 | ||
6baa7db0 | 589 | if (!mac_selinux_use()) |
66b6d9d5 WC |
590 | return; |
591 | ||
a1d2de07 | 592 | setsockcreatecon_raw(NULL); |
66b6d9d5 WC |
593 | #endif |
594 | } | |
595 | ||
cc56fafe | 596 | int mac_selinux_bind(int fd, const struct sockaddr *addr, socklen_t addrlen) { |
66b6d9d5 WC |
597 | |
598 | /* Binds a socket and label its file system object according to the SELinux policy */ | |
599 | ||
349cc4a5 | 600 | #if HAVE_SELINUX |
2ed96880 | 601 | _cleanup_freecon_ char *fcon = NULL; |
66b6d9d5 | 602 | const struct sockaddr_un *un; |
0f474365 | 603 | bool context_changed = false; |
66b6d9d5 WC |
604 | char *path; |
605 | int r; | |
606 | ||
607 | assert(fd >= 0); | |
608 | assert(addr); | |
609 | assert(addrlen >= sizeof(sa_family_t)); | |
610 | ||
ecabcf8b | 611 | if (!label_hnd) |
66b6d9d5 WC |
612 | goto skipped; |
613 | ||
614 | /* Filter out non-local sockets */ | |
615 | if (addr->sa_family != AF_UNIX) | |
616 | goto skipped; | |
617 | ||
618 | /* Filter out anonymous sockets */ | |
0f474365 | 619 | if (addrlen < offsetof(struct sockaddr_un, sun_path) + 1) |
66b6d9d5 WC |
620 | goto skipped; |
621 | ||
622 | /* Filter out abstract namespace sockets */ | |
623 | un = (const struct sockaddr_un*) addr; | |
624 | if (un->sun_path[0] == 0) | |
625 | goto skipped; | |
626 | ||
627 | path = strndupa(un->sun_path, addrlen - offsetof(struct sockaddr_un, sun_path)); | |
628 | ||
61f3e897 | 629 | /* Check for policy reload so 'label_hnd' is kept up-to-date by callbacks */ |
fd5e402f | 630 | mac_selinux_maybe_reload(); |
61f3e897 | 631 | |
66b6d9d5 WC |
632 | if (path_is_absolute(path)) |
633 | r = selabel_lookup_raw(label_hnd, &fcon, path, S_IFSOCK); | |
634 | else { | |
0f474365 | 635 | _cleanup_free_ char *newpath = NULL; |
66b6d9d5 | 636 | |
0f474365 LP |
637 | r = path_make_absolute_cwd(path, &newpath); |
638 | if (r < 0) | |
639 | return r; | |
66b6d9d5 WC |
640 | |
641 | r = selabel_lookup_raw(label_hnd, &fcon, newpath, S_IFSOCK); | |
642 | } | |
643 | ||
0f474365 LP |
644 | if (r < 0) { |
645 | /* No context specified by the policy? Proceed without setting it */ | |
646 | if (errno == ENOENT) | |
647 | goto skipped; | |
66b6d9d5 | 648 | |
65804d6a LP |
649 | r = log_enforcing_errno(errno, "Failed to determine SELinux security context for %s: %m", path); |
650 | if (r < 0) | |
651 | return r; | |
0f474365 | 652 | } else { |
a1d2de07 | 653 | if (setfscreatecon_raw(fcon) < 0) { |
65804d6a LP |
654 | r = log_enforcing_errno(errno, "Failed to set SELinux security context %s for %s: %m", fcon, path); |
655 | if (r < 0) | |
656 | return r; | |
0f474365 LP |
657 | } else |
658 | context_changed = true; | |
66b6d9d5 WC |
659 | } |
660 | ||
0f474365 LP |
661 | r = bind(fd, addr, addrlen) < 0 ? -errno : 0; |
662 | ||
663 | if (context_changed) | |
65804d6a | 664 | (void) setfscreatecon_raw(NULL); |
66b6d9d5 | 665 | |
66b6d9d5 WC |
666 | return r; |
667 | ||
668 | skipped: | |
669 | #endif | |
0f474365 LP |
670 | if (bind(fd, addr, addrlen) < 0) |
671 | return -errno; | |
672 | ||
673 | return 0; | |
66b6d9d5 | 674 | } |