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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 | 38 | static bool initialized = false; |
fd5e402f | 39 | static int last_policyload = 0; |
66b6d9d5 | 40 | static struct selabel_handle *label_hnd = NULL; |
c3b8bacd | 41 | static bool have_status_page = false; |
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 | 72 | bool mac_selinux_enforcing(void) { |
c3b8bacd | 73 | int r = 0; |
fd5e402f | 74 | #if HAVE_SELINUX |
c3b8bacd ZJS |
75 | |
76 | /* If the SELinux status page has been successfully opened, retrieve the enforcing | |
77 | * status over it to avoid system calls in security_getenforce(). */ | |
78 | ||
79 | if (have_status_page) | |
80 | r = selinux_status_getenforce(); | |
81 | else | |
82 | r = security_getenforce(); | |
83 | ||
fd5e402f | 84 | #endif |
c3b8bacd | 85 | return r != 0; |
fd5e402f CG |
86 | } |
87 | ||
6baa7db0 | 88 | void mac_selinux_retest(void) { |
349cc4a5 | 89 | #if HAVE_SELINUX |
6baa7db0 | 90 | cached_use = -1; |
66b6d9d5 | 91 | #endif |
cad45ba1 | 92 | } |
0b6018f3 | 93 | |
349cc4a5 | 94 | #if HAVE_SELINUX |
1885169c LP |
95 | # if HAVE_MALLINFO2 |
96 | # define HAVE_GENERIC_MALLINFO 1 | |
97 | typedef struct mallinfo2 generic_mallinfo; | |
98 | static generic_mallinfo generic_mallinfo_get(void) { | |
99 | return mallinfo2(); | |
100 | } | |
101 | # elif HAVE_MALLINFO | |
102 | # define HAVE_GENERIC_MALLINFO 1 | |
103 | typedef struct mallinfo generic_mallinfo; | |
104 | static generic_mallinfo generic_mallinfo_get(void) { | |
105 | /* glibc has deprecated mallinfo(), let's suppress the deprecation warning if mallinfo2() doesn't | |
106 | * exist yet. */ | |
4b6f74f5 ZJS |
107 | DISABLE_WARNING_DEPRECATED_DECLARATIONS |
108 | return mallinfo(); | |
109 | REENABLE_WARNING | |
110 | } | |
111 | # else | |
1885169c | 112 | # define HAVE_GENERIC_MALLINFO 0 |
4b6f74f5 ZJS |
113 | # endif |
114 | ||
fd5e402f CG |
115 | static int open_label_db(void) { |
116 | struct selabel_handle *hnd; | |
66b6d9d5 | 117 | usec_t before_timestamp, after_timestamp; |
66b6d9d5 | 118 | |
1885169c LP |
119 | # if HAVE_GENERIC_MALLINFO |
120 | generic_mallinfo before_mallinfo = generic_mallinfo_get(); | |
4b6f74f5 | 121 | # endif |
66b6d9d5 WC |
122 | before_timestamp = now(CLOCK_MONOTONIC); |
123 | ||
fd5e402f CG |
124 | hnd = selabel_open(SELABEL_CTX_FILE, NULL, 0); |
125 | if (!hnd) | |
a9ba0e32 | 126 | return log_enforcing_errno(errno, "Failed to initialize SELinux labeling handle: %m"); |
66b6d9d5 | 127 | |
65804d6a | 128 | after_timestamp = now(CLOCK_MONOTONIC); |
1885169c LP |
129 | # if HAVE_GENERIC_MALLINFO |
130 | generic_mallinfo after_mallinfo = generic_mallinfo_get(); | |
131 | size_t l = LESS_BY((size_t) after_mallinfo.uordblks, (size_t) before_mallinfo.uordblks); | |
132 | log_debug("Successfully loaded SELinux database in %s, size on heap is %zuK.", | |
5291f26d | 133 | FORMAT_TIMESPAN(after_timestamp - before_timestamp, 0), |
4b6f74f5 ZJS |
134 | DIV_ROUND_UP(l, 1024)); |
135 | # else | |
136 | log_debug("Successfully loaded SELinux database in %s.", | |
5291f26d | 137 | FORMAT_TIMESPAN(after_timestamp - before_timestamp, 0)); |
4b6f74f5 | 138 | # endif |
66b6d9d5 | 139 | |
fd5e402f CG |
140 | /* release memory after measurement */ |
141 | if (label_hnd) | |
142 | selabel_close(label_hnd); | |
143 | label_hnd = TAKE_PTR(hnd); | |
144 | ||
145 | return 0; | |
146 | } | |
147 | #endif | |
148 | ||
149 | int mac_selinux_init(void) { | |
150 | #if HAVE_SELINUX | |
151 | int r; | |
152 | ||
153 | if (initialized) | |
154 | return 0; | |
155 | ||
156 | if (!mac_selinux_use()) | |
157 | return 0; | |
158 | ||
961b341e ZJS |
159 | r = selinux_status_open(/* netlink fallback */ 1); |
160 | if (r < 0) { | |
161 | if (!ERRNO_IS_PRIVILEGE(errno)) | |
162 | return log_enforcing_errno(errno, "Failed to open SELinux status page: %m"); | |
163 | log_warning_errno(errno, "selinux_status_open() with netlink fallback failed, not checking for policy reloads: %m"); | |
164 | } else if (r == 1) | |
165 | log_warning("selinux_status_open() failed to open the status page, using the netlink fallback."); | |
166 | else | |
167 | have_status_page = true; | |
fd5e402f CG |
168 | |
169 | r = open_label_db(); | |
170 | if (r < 0) { | |
171 | selinux_status_close(); | |
172 | return r; | |
173 | } | |
174 | ||
961b341e ZJS |
175 | /* Save the current policyload sequence number, so mac_selinux_maybe_reload() does not trigger on |
176 | * first call without any actual change. */ | |
fd5e402f CG |
177 | last_policyload = selinux_status_policyload(); |
178 | ||
fd5e402f | 179 | initialized = true; |
65804d6a LP |
180 | #endif |
181 | return 0; | |
d682b3a7 LP |
182 | } |
183 | ||
fd5e402f CG |
184 | void mac_selinux_maybe_reload(void) { |
185 | #if HAVE_SELINUX | |
c46c7688 | 186 | int policyload; |
fd5e402f | 187 | |
1006038c CG |
188 | if (!initialized) |
189 | return; | |
190 | ||
c46c7688 CG |
191 | /* Do not use selinux_status_updated(3), cause since libselinux 3.2 selinux_check_access(3), |
192 | * called in core and user instances, does also use it under the hood. | |
193 | * That can cause changes to be consumed by selinux_check_access(3) and not being visible here. | |
194 | * Also do not use selinux callbacks, selinux_set_callback(3), cause they are only automatically | |
195 | * invoked since libselinux 3.2 by selinux_status_updated(3). | |
196 | * Relevant libselinux commit: https://github.com/SELinuxProject/selinux/commit/05bdc03130d741e53e1fb45a958d0a2c184be503 | |
197 | * Debian Bullseye is going to ship libselinux 3.1, so stay compatible for backports. */ | |
198 | policyload = selinux_status_policyload(); | |
199 | if (policyload < 0) { | |
200 | log_debug_errno(errno, "Failed to get SELinux policyload from status page: %m"); | |
201 | return; | |
202 | } | |
fd5e402f | 203 | |
c46c7688 CG |
204 | if (policyload != last_policyload) { |
205 | mac_selinux_reload(policyload); | |
206 | last_policyload = policyload; | |
fd5e402f CG |
207 | } |
208 | #endif | |
209 | } | |
210 | ||
ecabcf8b LP |
211 | void mac_selinux_finish(void) { |
212 | ||
349cc4a5 | 213 | #if HAVE_SELINUX |
fd5e402f CG |
214 | if (label_hnd) { |
215 | selabel_close(label_hnd); | |
216 | label_hnd = NULL; | |
217 | } | |
218 | ||
fd5e402f | 219 | selinux_status_close(); |
c3b8bacd | 220 | have_status_page = false; |
fd5e402f CG |
221 | |
222 | initialized = false; | |
ecabcf8b LP |
223 | #endif |
224 | } | |
225 | ||
a9dfac21 | 226 | #if HAVE_SELINUX |
61f3e897 | 227 | static int mac_selinux_reload(int seqno) { |
fd5e402f | 228 | log_debug("SELinux reload %d", seqno); |
a9dfac21 | 229 | |
fd5e402f | 230 | (void) open_label_db(); |
61f3e897 CG |
231 | |
232 | return 0; | |
a9dfac21 | 233 | } |
61f3e897 | 234 | #endif |
a9dfac21 | 235 | |
c3151977 | 236 | int mac_selinux_fix_container(const char *path, const char *inside_path, LabelFixFlags flags) { |
66b6d9d5 | 237 | |
9271daee LP |
238 | assert(path); |
239 | assert(inside_path); | |
240 | ||
349cc4a5 | 241 | #if HAVE_SELINUX |
08c84981 | 242 | _cleanup_close_ int fd = -1; |
5dfc5461 LP |
243 | |
244 | /* if mac_selinux_init() wasn't called before we are a NOOP */ | |
66b6d9d5 WC |
245 | if (!label_hnd) |
246 | return 0; | |
247 | ||
08c84981 LP |
248 | /* Open the file as O_PATH, to pin it while we determine and adjust the label */ |
249 | fd = open(path, O_NOFOLLOW|O_CLOEXEC|O_PATH); | |
250 | if (fd < 0) { | |
251 | if ((flags & LABEL_IGNORE_ENOENT) && errno == ENOENT) | |
252 | return 0; | |
253 | ||
254 | return -errno; | |
255 | } | |
256 | ||
9271daee LP |
257 | return mac_selinux_fix_container_fd(fd, path, inside_path, flags); |
258 | #endif | |
259 | ||
260 | return 0; | |
261 | } | |
262 | ||
263 | int mac_selinux_fix_container_fd(int fd, const char *path, const char *inside_path, LabelFixFlags flags) { | |
264 | ||
265 | assert(fd >= 0); | |
266 | assert(inside_path); | |
267 | ||
268 | #if HAVE_SELINUX | |
269 | char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)]; | |
270 | _cleanup_freecon_ char* fcon = NULL; | |
271 | struct stat st; | |
272 | int r; | |
273 | ||
274 | /* if mac_selinux_init() wasn't called before we are a NOOP */ | |
275 | if (!label_hnd) | |
276 | return 0; | |
277 | ||
08c84981 LP |
278 | if (fstat(fd, &st) < 0) |
279 | return -errno; | |
5dfc5461 | 280 | |
61f3e897 | 281 | /* Check for policy reload so 'label_hnd' is kept up-to-date by callbacks */ |
fd5e402f | 282 | mac_selinux_maybe_reload(); |
7960ba96 ZJS |
283 | if (!label_hnd) |
284 | return 0; | |
61f3e897 | 285 | |
c3151977 | 286 | if (selabel_lookup_raw(label_hnd, &fcon, inside_path, st.st_mode) < 0) { |
66b6d9d5 | 287 | /* If there's no label to set, then exit without warning */ |
9271daee | 288 | if (errno == ENOENT) |
66b6d9d5 WC |
289 | return 0; |
290 | ||
9271daee | 291 | r = -errno; |
08c84981 | 292 | goto fail; |
66b6d9d5 WC |
293 | } |
294 | ||
08c84981 LP |
295 | xsprintf(procfs_path, "/proc/self/fd/%i", fd); |
296 | if (setfilecon_raw(procfs_path, fcon) < 0) { | |
297 | _cleanup_freecon_ char *oldcon = NULL; | |
298 | ||
08c84981 | 299 | /* If the FS doesn't support labels, then exit without warning */ |
9271daee | 300 | if (ERRNO_IS_NOT_SUPPORTED(errno)) |
66b6d9d5 WC |
301 | return 0; |
302 | ||
08c84981 | 303 | /* It the FS is read-only and we were told to ignore failures caused by that, suppress error */ |
9271daee | 304 | if (errno == EROFS && (flags & LABEL_IGNORE_EROFS)) |
66b6d9d5 WC |
305 | return 0; |
306 | ||
9271daee LP |
307 | r = -errno; |
308 | ||
08c84981 LP |
309 | /* If the old label is identical to the new one, suppress any kind of error */ |
310 | if (getfilecon_raw(procfs_path, &oldcon) >= 0 && streq(fcon, oldcon)) | |
311 | return 0; | |
312 | ||
313 | goto fail; | |
66b6d9d5 | 314 | } |
08c84981 LP |
315 | |
316 | return 0; | |
317 | ||
318 | fail: | |
9271daee | 319 | return log_enforcing_errno(r, "Unable to fix SELinux security context of %s (%s): %m", strna(path), strna(inside_path)); |
66b6d9d5 WC |
320 | #endif |
321 | ||
ecabcf8b | 322 | return 0; |
66b6d9d5 WC |
323 | } |
324 | ||
ecabcf8b | 325 | int mac_selinux_apply(const char *path, const char *label) { |
66b6d9d5 | 326 | |
9271daee LP |
327 | assert(path); |
328 | ||
349cc4a5 | 329 | #if HAVE_SELINUX |
ecabcf8b LP |
330 | if (!mac_selinux_use()) |
331 | return 0; | |
332 | ||
0f474365 LP |
333 | assert(label); |
334 | ||
65804d6a LP |
335 | if (setfilecon(path, label) < 0) |
336 | return log_enforcing_errno(errno, "Failed to set SELinux security context %s on path %s: %m", label, path); | |
66b6d9d5 | 337 | #endif |
ecabcf8b | 338 | return 0; |
d682b3a7 LP |
339 | } |
340 | ||
9271daee LP |
341 | int mac_selinux_apply_fd(int fd, const char *path, const char *label) { |
342 | ||
343 | assert(fd >= 0); | |
344 | ||
345 | #if HAVE_SELINUX | |
346 | if (!mac_selinux_use()) | |
347 | return 0; | |
348 | ||
349 | assert(label); | |
350 | ||
351 | if (fsetfilecon(fd, label) < 0) | |
352 | return log_enforcing_errno(errno, "Failed to set SELinux security context %s on path %s: %m", label, strna(path)); | |
353 | #endif | |
354 | return 0; | |
355 | } | |
356 | ||
cc56fafe | 357 | int mac_selinux_get_create_label_from_exe(const char *exe, char **label) { |
349cc4a5 | 358 | #if HAVE_SELINUX |
2ed96880 | 359 | _cleanup_freecon_ char *mycon = NULL, *fcon = NULL; |
66b6d9d5 | 360 | security_class_t sclass; |
65804d6a | 361 | int r; |
66b6d9d5 | 362 | |
7f416dae LP |
363 | assert(exe); |
364 | assert(label); | |
365 | ||
6d395665 | 366 | if (!mac_selinux_use()) |
7f416dae | 367 | return -EOPNOTSUPP; |
66b6d9d5 | 368 | |
24154879 | 369 | r = getcon_raw(&mycon); |
66b6d9d5 | 370 | if (r < 0) |
7f416dae | 371 | return -errno; |
66b6d9d5 | 372 | |
24154879 | 373 | r = getfilecon_raw(exe, &fcon); |
66b6d9d5 | 374 | if (r < 0) |
7f416dae | 375 | return -errno; |
66b6d9d5 WC |
376 | |
377 | sclass = string_to_security_class("process"); | |
fdb0405e CG |
378 | if (sclass == 0) |
379 | return -ENOSYS; | |
380 | ||
2ed96880 | 381 | r = security_compute_create_raw(mycon, fcon, sclass, label); |
7f416dae LP |
382 | if (r < 0) |
383 | return -errno; | |
66b6d9d5 | 384 | |
65804d6a LP |
385 | return 0; |
386 | #else | |
387 | return -EOPNOTSUPP; | |
388 | #endif | |
66b6d9d5 WC |
389 | } |
390 | ||
cc56fafe | 391 | int mac_selinux_get_our_label(char **label) { |
65804d6a LP |
392 | #if HAVE_SELINUX |
393 | int r; | |
66b6d9d5 | 394 | |
7f416dae LP |
395 | assert(label); |
396 | ||
6d395665 | 397 | if (!mac_selinux_use()) |
7f416dae | 398 | return -EOPNOTSUPP; |
66b6d9d5 | 399 | |
24154879 | 400 | r = getcon_raw(label); |
66b6d9d5 | 401 | if (r < 0) |
7f416dae | 402 | return -errno; |
66b6d9d5 | 403 | |
65804d6a LP |
404 | return 0; |
405 | #else | |
406 | return -EOPNOTSUPP; | |
407 | #endif | |
66b6d9d5 WC |
408 | } |
409 | ||
9008e1ac | 410 | int mac_selinux_get_child_mls_label(int socket_fd, const char *exe, const char *exec_label, char **label) { |
349cc4a5 | 411 | #if HAVE_SELINUX |
2ed96880 | 412 | _cleanup_freecon_ char *mycon = NULL, *peercon = NULL, *fcon = NULL; |
66b6d9d5 WC |
413 | _cleanup_context_free_ context_t pcon = NULL, bcon = NULL; |
414 | security_class_t sclass; | |
66b6d9d5 | 415 | const char *range = NULL; |
65804d6a | 416 | int r; |
66b6d9d5 WC |
417 | |
418 | assert(socket_fd >= 0); | |
419 | assert(exe); | |
420 | assert(label); | |
421 | ||
6d395665 | 422 | if (!mac_selinux_use()) |
7f416dae LP |
423 | return -EOPNOTSUPP; |
424 | ||
24154879 | 425 | r = getcon_raw(&mycon); |
7f416dae LP |
426 | if (r < 0) |
427 | return -errno; | |
66b6d9d5 | 428 | |
a1d2de07 | 429 | r = getpeercon_raw(socket_fd, &peercon); |
7f416dae LP |
430 | if (r < 0) |
431 | return -errno; | |
66b6d9d5 | 432 | |
9008e1ac | 433 | if (!exec_label) { |
66b6d9d5 WC |
434 | /* If there is no context set for next exec let's use context |
435 | of target executable */ | |
24154879 | 436 | r = getfilecon_raw(exe, &fcon); |
7f416dae LP |
437 | if (r < 0) |
438 | return -errno; | |
66b6d9d5 WC |
439 | } |
440 | ||
441 | bcon = context_new(mycon); | |
7f416dae LP |
442 | if (!bcon) |
443 | return -ENOMEM; | |
66b6d9d5 WC |
444 | |
445 | pcon = context_new(peercon); | |
7f416dae LP |
446 | if (!pcon) |
447 | return -ENOMEM; | |
66b6d9d5 WC |
448 | |
449 | range = context_range_get(pcon); | |
7f416dae LP |
450 | if (!range) |
451 | return -errno; | |
66b6d9d5 WC |
452 | |
453 | r = context_range_set(bcon, range); | |
7f416dae LP |
454 | if (r) |
455 | return -errno; | |
66b6d9d5 WC |
456 | |
457 | freecon(mycon); | |
458 | mycon = strdup(context_str(bcon)); | |
7f416dae LP |
459 | if (!mycon) |
460 | return -ENOMEM; | |
66b6d9d5 WC |
461 | |
462 | sclass = string_to_security_class("process"); | |
fdb0405e CG |
463 | if (sclass == 0) |
464 | return -ENOSYS; | |
465 | ||
2ed96880 | 466 | r = security_compute_create_raw(mycon, fcon, sclass, label); |
7f416dae LP |
467 | if (r < 0) |
468 | return -errno; | |
7f416dae | 469 | |
65804d6a LP |
470 | return 0; |
471 | #else | |
472 | return -EOPNOTSUPP; | |
473 | #endif | |
66b6d9d5 WC |
474 | } |
475 | ||
710a6b50 | 476 | char* mac_selinux_free(char *label) { |
ecabcf8b | 477 | |
349cc4a5 | 478 | #if HAVE_SELINUX |
2ed96880 | 479 | freecon(label); |
3d9fbea4 CG |
480 | #else |
481 | assert(!label); | |
ecabcf8b | 482 | #endif |
710a6b50 LP |
483 | |
484 | return NULL; | |
ecabcf8b LP |
485 | } |
486 | ||
349cc4a5 | 487 | #if HAVE_SELINUX |
7e531a52 | 488 | static int selinux_create_file_prepare_abspath(const char *abspath, mode_t mode) { |
2ed96880 | 489 | _cleanup_freecon_ char *filecon = NULL; |
0f474365 | 490 | int r; |
66b6d9d5 | 491 | |
7e531a52 FB |
492 | assert(abspath); |
493 | assert(path_is_absolute(abspath)); | |
c34255bd | 494 | |
61f3e897 | 495 | /* Check for policy reload so 'label_hnd' is kept up-to-date by callbacks */ |
fd5e402f | 496 | mac_selinux_maybe_reload(); |
7960ba96 ZJS |
497 | if (!label_hnd) |
498 | return 0; | |
61f3e897 | 499 | |
7e531a52 | 500 | r = selabel_lookup_raw(label_hnd, &filecon, abspath, mode); |
0f474365 LP |
501 | if (r < 0) { |
502 | /* No context specified by the policy? Proceed without setting it. */ | |
503 | if (errno == ENOENT) | |
504 | return 0; | |
2d58aa46 | 505 | |
65804d6a | 506 | return log_enforcing_errno(errno, "Failed to determine SELinux security context for %s: %m", abspath); |
66b6d9d5 WC |
507 | } |
508 | ||
65804d6a LP |
509 | if (setfscreatecon_raw(filecon) < 0) |
510 | return log_enforcing_errno(errno, "Failed to set SELinux security context %s for %s: %m", filecon, abspath); | |
66b6d9d5 | 511 | |
0f474365 | 512 | return 0; |
66b6d9d5 | 513 | } |
7e531a52 FB |
514 | #endif |
515 | ||
516 | int mac_selinux_create_file_prepare_at(int dirfd, const char *path, mode_t mode) { | |
7e531a52 FB |
517 | #if HAVE_SELINUX |
518 | _cleanup_free_ char *abspath = NULL; | |
65804d6a LP |
519 | int r; |
520 | ||
7e531a52 FB |
521 | assert(path); |
522 | ||
523 | if (!label_hnd) | |
524 | return 0; | |
525 | ||
526 | if (!path_is_absolute(path)) { | |
7e531a52 | 527 | if (dirfd == AT_FDCWD) |
4ede9802 | 528 | r = safe_getcwd(&abspath); |
7e531a52 | 529 | else |
4ede9802 | 530 | r = fd_get_path(dirfd, &abspath); |
7e531a52 FB |
531 | if (r < 0) |
532 | return r; | |
533 | ||
4ede9802 | 534 | if (!path_extend(&abspath, path)) |
7e531a52 | 535 | return -ENOMEM; |
4ede9802 LP |
536 | |
537 | path = abspath; | |
7e531a52 FB |
538 | } |
539 | ||
65804d6a LP |
540 | return selinux_create_file_prepare_abspath(path, mode); |
541 | #else | |
542 | return 0; | |
7e531a52 | 543 | #endif |
7e531a52 FB |
544 | } |
545 | ||
546 | int mac_selinux_create_file_prepare(const char *path, mode_t mode) { | |
7e531a52 | 547 | #if HAVE_SELINUX |
65804d6a LP |
548 | int r; |
549 | ||
7e531a52 FB |
550 | _cleanup_free_ char *abspath = NULL; |
551 | ||
552 | assert(path); | |
553 | ||
554 | if (!label_hnd) | |
555 | return 0; | |
556 | ||
557 | r = path_make_absolute_cwd(path, &abspath); | |
558 | if (r < 0) | |
559 | return r; | |
560 | ||
65804d6a LP |
561 | return selinux_create_file_prepare_abspath(abspath, mode); |
562 | #else | |
563 | return 0; | |
7e531a52 | 564 | #endif |
7e531a52 | 565 | } |
66b6d9d5 | 566 | |
ecabcf8b | 567 | void mac_selinux_create_file_clear(void) { |
66b6d9d5 | 568 | |
349cc4a5 | 569 | #if HAVE_SELINUX |
66b6d9d5 WC |
570 | PROTECT_ERRNO; |
571 | ||
6baa7db0 | 572 | if (!mac_selinux_use()) |
66b6d9d5 WC |
573 | return; |
574 | ||
a1d2de07 | 575 | setfscreatecon_raw(NULL); |
66b6d9d5 WC |
576 | #endif |
577 | } | |
578 | ||
ecabcf8b | 579 | int mac_selinux_create_socket_prepare(const char *label) { |
66b6d9d5 | 580 | |
349cc4a5 | 581 | #if HAVE_SELINUX |
ecabcf8b LP |
582 | assert(label); |
583 | ||
65804d6a LP |
584 | if (!mac_selinux_use()) |
585 | return 0; | |
ecabcf8b | 586 | |
65804d6a LP |
587 | if (setsockcreatecon(label) < 0) |
588 | return log_enforcing_errno(errno, "Failed to set SELinux security context %s for sockets: %m", label); | |
66b6d9d5 | 589 | #endif |
ecabcf8b LP |
590 | |
591 | return 0; | |
66b6d9d5 WC |
592 | } |
593 | ||
ecabcf8b | 594 | void mac_selinux_create_socket_clear(void) { |
66b6d9d5 | 595 | |
349cc4a5 | 596 | #if HAVE_SELINUX |
ecabcf8b LP |
597 | PROTECT_ERRNO; |
598 | ||
6baa7db0 | 599 | if (!mac_selinux_use()) |
66b6d9d5 WC |
600 | return; |
601 | ||
a1d2de07 | 602 | setsockcreatecon_raw(NULL); |
66b6d9d5 WC |
603 | #endif |
604 | } | |
605 | ||
cc56fafe | 606 | int mac_selinux_bind(int fd, const struct sockaddr *addr, socklen_t addrlen) { |
66b6d9d5 WC |
607 | |
608 | /* Binds a socket and label its file system object according to the SELinux policy */ | |
609 | ||
349cc4a5 | 610 | #if HAVE_SELINUX |
2ed96880 | 611 | _cleanup_freecon_ char *fcon = NULL; |
66b6d9d5 | 612 | const struct sockaddr_un *un; |
0f474365 | 613 | bool context_changed = false; |
66b6d9d5 WC |
614 | char *path; |
615 | int r; | |
616 | ||
617 | assert(fd >= 0); | |
618 | assert(addr); | |
619 | assert(addrlen >= sizeof(sa_family_t)); | |
620 | ||
ecabcf8b | 621 | if (!label_hnd) |
66b6d9d5 WC |
622 | goto skipped; |
623 | ||
624 | /* Filter out non-local sockets */ | |
625 | if (addr->sa_family != AF_UNIX) | |
626 | goto skipped; | |
627 | ||
628 | /* Filter out anonymous sockets */ | |
0f474365 | 629 | if (addrlen < offsetof(struct sockaddr_un, sun_path) + 1) |
66b6d9d5 WC |
630 | goto skipped; |
631 | ||
632 | /* Filter out abstract namespace sockets */ | |
633 | un = (const struct sockaddr_un*) addr; | |
634 | if (un->sun_path[0] == 0) | |
635 | goto skipped; | |
636 | ||
637 | path = strndupa(un->sun_path, addrlen - offsetof(struct sockaddr_un, sun_path)); | |
638 | ||
61f3e897 | 639 | /* Check for policy reload so 'label_hnd' is kept up-to-date by callbacks */ |
fd5e402f | 640 | mac_selinux_maybe_reload(); |
7960ba96 ZJS |
641 | if (!label_hnd) |
642 | goto skipped; | |
61f3e897 | 643 | |
66b6d9d5 WC |
644 | if (path_is_absolute(path)) |
645 | r = selabel_lookup_raw(label_hnd, &fcon, path, S_IFSOCK); | |
646 | else { | |
0f474365 | 647 | _cleanup_free_ char *newpath = NULL; |
66b6d9d5 | 648 | |
0f474365 LP |
649 | r = path_make_absolute_cwd(path, &newpath); |
650 | if (r < 0) | |
651 | return r; | |
66b6d9d5 WC |
652 | |
653 | r = selabel_lookup_raw(label_hnd, &fcon, newpath, S_IFSOCK); | |
654 | } | |
655 | ||
0f474365 LP |
656 | if (r < 0) { |
657 | /* No context specified by the policy? Proceed without setting it */ | |
658 | if (errno == ENOENT) | |
659 | goto skipped; | |
66b6d9d5 | 660 | |
65804d6a LP |
661 | r = log_enforcing_errno(errno, "Failed to determine SELinux security context for %s: %m", path); |
662 | if (r < 0) | |
663 | return r; | |
0f474365 | 664 | } else { |
a1d2de07 | 665 | if (setfscreatecon_raw(fcon) < 0) { |
65804d6a LP |
666 | r = log_enforcing_errno(errno, "Failed to set SELinux security context %s for %s: %m", fcon, path); |
667 | if (r < 0) | |
668 | return r; | |
0f474365 LP |
669 | } else |
670 | context_changed = true; | |
66b6d9d5 WC |
671 | } |
672 | ||
0f474365 LP |
673 | r = bind(fd, addr, addrlen) < 0 ? -errno : 0; |
674 | ||
675 | if (context_changed) | |
65804d6a | 676 | (void) setfscreatecon_raw(NULL); |
66b6d9d5 | 677 | |
66b6d9d5 WC |
678 | return r; |
679 | ||
680 | skipped: | |
681 | #endif | |
0f474365 LP |
682 | if (bind(fd, addr, addrlen) < 0) |
683 | return -errno; | |
684 | ||
685 | return 0; | |
66b6d9d5 | 686 | } |