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d6c9574f | 1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
e51bc1a2 LP |
2 | |
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2010 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
9 | under the terms of the GNU Lesser General Public License as published by |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
e51bc1a2 LP |
11 | (at your option) any later version. |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
5430f7f2 | 16 | Lesser General Public License for more details. |
e51bc1a2 | 17 | |
5430f7f2 | 18 | You should have received a copy of the GNU Lesser General Public License |
e51bc1a2 LP |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
20 | ***/ | |
21 | ||
22 | #include <errno.h> | |
23 | #include <sys/stat.h> | |
24 | #include <unistd.h> | |
455a946f | 25 | #include <malloc.h> |
f13e30d2 LP |
26 | #include <sys/socket.h> |
27 | #include <sys/un.h> | |
e51bc1a2 LP |
28 | |
29 | #include "label.h" | |
30 | #include "util.h" | |
9eb977db | 31 | #include "path-util.h" |
e51bc1a2 LP |
32 | |
33 | #ifdef HAVE_SELINUX | |
34 | #include <selinux/selinux.h> | |
35 | #include <selinux/label.h> | |
36 | ||
37 | static struct selabel_handle *label_hnd = NULL; | |
38 | ||
4d4c7486 LP |
39 | static int use_selinux_cached = -1; |
40 | ||
e51bc1a2 | 41 | static inline bool use_selinux(void) { |
e51bc1a2 | 42 | |
4ef31082 LP |
43 | if (use_selinux_cached < 0) |
44 | use_selinux_cached = is_selinux_enabled() > 0; | |
e51bc1a2 | 45 | |
4ef31082 | 46 | return use_selinux_cached; |
e51bc1a2 LP |
47 | } |
48 | ||
4d4c7486 LP |
49 | void label_retest_selinux(void) { |
50 | use_selinux_cached = -1; | |
51 | } | |
52 | ||
e51bc1a2 LP |
53 | #endif |
54 | ||
9b5af248 | 55 | int label_init(const char *prefixes[]) { |
e51bc1a2 LP |
56 | int r = 0; |
57 | ||
58 | #ifdef HAVE_SELINUX | |
189583d7 LP |
59 | usec_t before_timestamp, after_timestamp; |
60 | struct mallinfo before_mallinfo, after_mallinfo; | |
e51bc1a2 LP |
61 | |
62 | if (!use_selinux()) | |
63 | return 0; | |
64 | ||
c4dcdb9f LP |
65 | if (label_hnd) |
66 | return 0; | |
67 | ||
189583d7 LP |
68 | before_mallinfo = mallinfo(); |
69 | before_timestamp = now(CLOCK_MONOTONIC); | |
455a946f | 70 | |
9b5af248 | 71 | if (prefixes) { |
e9a5ef7c | 72 | struct selinux_opt options[] = { |
9b5af248 | 73 | { .type = SELABEL_OPT_SUBSET, .values = prefixes }, |
e9a5ef7c KS |
74 | }; |
75 | ||
76 | label_hnd = selabel_open(SELABEL_CTX_FILE, options, ELEMENTSOF(options)); | |
77 | } else | |
78 | label_hnd = selabel_open(SELABEL_CTX_FILE, NULL, 0); | |
79 | ||
e51bc1a2 LP |
80 | if (!label_hnd) { |
81 | log_full(security_getenforce() == 1 ? LOG_ERR : LOG_DEBUG, | |
82 | "Failed to initialize SELinux context: %m"); | |
049f8642 | 83 | r = security_getenforce() == 1 ? -errno : 0; |
871e5809 | 84 | } else { |
189583d7 | 85 | char timespan[FORMAT_TIMESPAN_MAX]; |
455a946f | 86 | int l; |
871e5809 | 87 | |
189583d7 LP |
88 | after_timestamp = now(CLOCK_MONOTONIC); |
89 | after_mallinfo = mallinfo(); | |
871e5809 | 90 | |
189583d7 | 91 | l = after_mallinfo.uordblks > before_mallinfo.uordblks ? after_mallinfo.uordblks - before_mallinfo.uordblks : 0; |
455a946f | 92 | |
107a2db9 LP |
93 | log_debug("Successfully loaded SELinux database in %s, size on heap is %iK.", |
94 | format_timespan(timespan, sizeof(timespan), after_timestamp - before_timestamp), | |
95 | (l+1023)/1024); | |
455a946f | 96 | } |
e51bc1a2 LP |
97 | #endif |
98 | ||
99 | return r; | |
100 | } | |
101 | ||
c904f64d | 102 | int label_fix(const char *path, bool ignore_enoent) { |
e51bc1a2 LP |
103 | int r = 0; |
104 | ||
105 | #ifdef HAVE_SELINUX | |
106 | struct stat st; | |
107 | security_context_t fcon; | |
108 | ||
109 | if (!use_selinux() || !label_hnd) | |
110 | return 0; | |
111 | ||
112 | r = lstat(path, &st); | |
113 | if (r == 0) { | |
114 | r = selabel_lookup_raw(label_hnd, &fcon, path, st.st_mode); | |
115 | ||
5a33f657 LP |
116 | /* If there's no label to set, then exit without warning */ |
117 | if (r < 0 && errno == ENOENT) | |
118 | return 0; | |
119 | ||
e51bc1a2 | 120 | if (r == 0) { |
81c3f1f6 | 121 | r = lsetfilecon(path, fcon); |
e51bc1a2 | 122 | freecon(fcon); |
d2dfce17 LP |
123 | |
124 | /* If the FS doesn't support labels, then exit without warning */ | |
125 | if (r < 0 && errno == ENOTSUP) | |
126 | return 0; | |
e51bc1a2 LP |
127 | } |
128 | } | |
5a33f657 | 129 | |
e51bc1a2 | 130 | if (r < 0) { |
b4bd5144 LP |
131 | /* Ignore ENOENT in some cases */ |
132 | if (ignore_enoent && errno == ENOENT) | |
133 | return 0; | |
134 | ||
e51bc1a2 LP |
135 | log_full(security_getenforce() == 1 ? LOG_ERR : LOG_DEBUG, |
136 | "Unable to fix label of %s: %m", path); | |
049f8642 | 137 | r = security_getenforce() == 1 ? -errno : 0; |
e51bc1a2 LP |
138 | } |
139 | #endif | |
140 | ||
141 | return r; | |
142 | } | |
143 | ||
144 | void label_finish(void) { | |
145 | ||
146 | #ifdef HAVE_SELINUX | |
147 | if (use_selinux() && label_hnd) | |
148 | selabel_close(label_hnd); | |
149 | #endif | |
150 | } | |
151 | ||
189583d7 | 152 | int label_get_create_label_from_exe(const char *exe, char **label) { |
e51bc1a2 LP |
153 | |
154 | int r = 0; | |
155 | ||
156 | #ifdef HAVE_SELINUX | |
157 | security_context_t mycon = NULL, fcon = NULL; | |
158 | security_class_t sclass; | |
159 | ||
160 | if (!use_selinux()) { | |
161 | *label = NULL; | |
162 | return 0; | |
163 | } | |
164 | ||
165 | r = getcon(&mycon); | |
166 | if (r < 0) | |
167 | goto fail; | |
168 | ||
169 | r = getfilecon(exe, &fcon); | |
170 | if (r < 0) | |
171 | goto fail; | |
172 | ||
173 | sclass = string_to_security_class("process"); | |
174 | r = security_compute_create(mycon, fcon, sclass, (security_context_t *) label); | |
175 | if (r == 0) | |
176 | log_debug("SELinux Socket context for %s will be set to %s", exe, *label); | |
177 | ||
178 | fail: | |
179 | if (r < 0 && security_getenforce() == 1) | |
180 | r = -errno; | |
181 | ||
182 | freecon(mycon); | |
183 | freecon(fcon); | |
184 | #endif | |
185 | ||
186 | return r; | |
187 | } | |
188 | ||
e9a5ef7c | 189 | int label_context_set(const char *path, mode_t mode) { |
5c0532d1 LP |
190 | int r = 0; |
191 | ||
192 | #ifdef HAVE_SELINUX | |
193 | security_context_t filecon = NULL; | |
194 | ||
195 | if (!use_selinux() || !label_hnd) | |
196 | return 0; | |
197 | ||
e9a5ef7c | 198 | r = selabel_lookup_raw(label_hnd, &filecon, path, mode); |
382241ee LP |
199 | if (r < 0) |
200 | r = -errno; | |
201 | else if (r == 0) { | |
202 | r = setfscreatecon(filecon); | |
203 | if (r < 0) { | |
5c0532d1 LP |
204 | log_error("Failed to set SELinux file context on %s: %m", path); |
205 | r = -errno; | |
206 | } | |
207 | ||
208 | freecon(filecon); | |
209 | } | |
210 | ||
211 | if (r < 0 && security_getenforce() == 0) | |
212 | r = 0; | |
213 | #endif | |
214 | ||
215 | return r; | |
216 | } | |
217 | ||
e51bc1a2 LP |
218 | int label_socket_set(const char *label) { |
219 | ||
220 | #ifdef HAVE_SELINUX | |
221 | if (!use_selinux()) | |
222 | return 0; | |
223 | ||
224 | if (setsockcreatecon((security_context_t) label) < 0) { | |
225 | log_full(security_getenforce() == 1 ? LOG_ERR : LOG_DEBUG, | |
226 | "Failed to set SELinux context (%s) on socket: %m", label); | |
227 | ||
228 | if (security_getenforce() == 1) | |
229 | return -errno; | |
230 | } | |
231 | #endif | |
232 | ||
233 | return 0; | |
234 | } | |
235 | ||
e9a5ef7c | 236 | void label_context_clear(void) { |
e51bc1a2 LP |
237 | |
238 | #ifdef HAVE_SELINUX | |
239 | if (!use_selinux()) | |
240 | return; | |
241 | ||
242 | setfscreatecon(NULL); | |
243 | #endif | |
244 | } | |
245 | ||
246 | void label_socket_clear(void) { | |
247 | ||
248 | #ifdef HAVE_SELINUX | |
249 | if (!use_selinux()) | |
250 | return; | |
251 | ||
252 | setsockcreatecon(NULL); | |
253 | #endif | |
254 | } | |
255 | ||
256 | void label_free(const char *label) { | |
257 | ||
258 | #ifdef HAVE_SELINUX | |
259 | if (!use_selinux()) | |
260 | return; | |
261 | ||
262 | freecon((security_context_t) label); | |
263 | #endif | |
264 | } | |
265 | ||
c66e7f04 | 266 | int label_mkdir(const char *path, mode_t mode, bool apply) { |
e51bc1a2 LP |
267 | |
268 | /* Creates a directory and labels it according to the SELinux policy */ | |
e51bc1a2 LP |
269 | #ifdef HAVE_SELINUX |
270 | int r; | |
271 | security_context_t fcon = NULL; | |
272 | ||
c66e7f04 | 273 | if (!apply || !use_selinux() || !label_hnd) |
f13e30d2 | 274 | goto skipped; |
e51bc1a2 | 275 | |
f13e30d2 | 276 | if (path_is_absolute(path)) |
382241ee | 277 | r = selabel_lookup_raw(label_hnd, &fcon, path, S_IFDIR); |
f13e30d2 LP |
278 | else { |
279 | char *newpath; | |
e51bc1a2 | 280 | |
f13e30d2 LP |
281 | newpath = path_make_absolute_cwd(path); |
282 | if (!newpath) | |
283 | return -ENOMEM; | |
e51bc1a2 | 284 | |
382241ee | 285 | r = selabel_lookup_raw(label_hnd, &fcon, newpath, S_IFDIR); |
f13e30d2 LP |
286 | free(newpath); |
287 | } | |
288 | ||
289 | if (r == 0) | |
290 | r = setfscreatecon(fcon); | |
e51bc1a2 | 291 | |
f13e30d2 LP |
292 | if (r < 0 && errno != ENOENT) { |
293 | log_error("Failed to set security context %s for %s: %m", fcon, path); | |
e51bc1a2 | 294 | |
f13e30d2 | 295 | if (security_getenforce() == 1) { |
e51bc1a2 | 296 | r = -errno; |
f13e30d2 | 297 | goto finish; |
e51bc1a2 LP |
298 | } |
299 | } | |
300 | ||
f13e30d2 LP |
301 | r = mkdir(path, mode); |
302 | if (r < 0) | |
e51bc1a2 LP |
303 | r = -errno; |
304 | ||
305 | finish: | |
f13e30d2 LP |
306 | setfscreatecon(NULL); |
307 | freecon(fcon); | |
308 | ||
309 | return r; | |
310 | ||
311 | skipped: | |
312 | #endif | |
313 | return mkdir(path, mode) < 0 ? -errno : 0; | |
314 | } | |
315 | ||
316 | int label_bind(int fd, const struct sockaddr *addr, socklen_t addrlen) { | |
317 | ||
318 | /* Binds a socket and label its file system object according to the SELinux policy */ | |
319 | ||
320 | #ifdef HAVE_SELINUX | |
321 | int r; | |
322 | security_context_t fcon = NULL; | |
323 | const struct sockaddr_un *un; | |
324 | char *path = NULL; | |
325 | ||
326 | assert(fd >= 0); | |
327 | assert(addr); | |
328 | assert(addrlen >= sizeof(sa_family_t)); | |
329 | ||
330 | if (!use_selinux() || !label_hnd) | |
331 | goto skipped; | |
332 | ||
333 | /* Filter out non-local sockets */ | |
334 | if (addr->sa_family != AF_UNIX) | |
335 | goto skipped; | |
336 | ||
337 | /* Filter out anonymous sockets */ | |
338 | if (addrlen < sizeof(sa_family_t) + 1) | |
339 | goto skipped; | |
340 | ||
341 | /* Filter out abstract namespace sockets */ | |
342 | un = (const struct sockaddr_un*) addr; | |
343 | if (un->sun_path[0] == 0) | |
344 | goto skipped; | |
345 | ||
346 | path = strndup(un->sun_path, addrlen - offsetof(struct sockaddr_un, sun_path)); | |
347 | if (!path) | |
348 | return -ENOMEM; | |
349 | ||
350 | if (path_is_absolute(path)) | |
382241ee | 351 | r = selabel_lookup_raw(label_hnd, &fcon, path, S_IFSOCK); |
f13e30d2 LP |
352 | else { |
353 | char *newpath; | |
354 | ||
355 | newpath = path_make_absolute_cwd(path); | |
356 | ||
357 | if (!newpath) { | |
358 | free(path); | |
359 | return -ENOMEM; | |
360 | } | |
361 | ||
382241ee | 362 | r = selabel_lookup_raw(label_hnd, &fcon, newpath, S_IFSOCK); |
f13e30d2 | 363 | free(newpath); |
e51bc1a2 LP |
364 | } |
365 | ||
f13e30d2 LP |
366 | if (r == 0) |
367 | r = setfscreatecon(fcon); | |
368 | ||
369 | if (r < 0 && errno != ENOENT) { | |
370 | log_error("Failed to set security context %s for %s: %m", fcon, path); | |
371 | ||
372 | if (security_getenforce() == 1) { | |
373 | r = -errno; | |
374 | goto finish; | |
375 | } | |
376 | } | |
377 | ||
378 | r = bind(fd, addr, addrlen); | |
379 | if (r < 0) | |
380 | r = -errno; | |
381 | ||
382 | finish: | |
383 | setfscreatecon(NULL); | |
384 | freecon(fcon); | |
385 | free(path); | |
386 | ||
e51bc1a2 | 387 | return r; |
f13e30d2 LP |
388 | |
389 | skipped: | |
e51bc1a2 | 390 | #endif |
f13e30d2 | 391 | return bind(fd, addr, addrlen) < 0 ? -errno : 0; |
e51bc1a2 | 392 | } |