108static unsigned int mac_max_policies = MAC_MAX_POLICIES;
109static unsigned int mac_policy_offsets_free = (1 << MAC_MAX_POLICIES) - 1;
110SYSCTL_UINT(_security_mac, OID_AUTO, max_policies, CTLFLAG_RD,
111 &mac_max_policies, 0, "");
112
113static int mac_late = 0;
114
115static int mac_enforce_fs = 1;
116SYSCTL_INT(_security_mac, OID_AUTO, enforce_fs, CTLFLAG_RW,
117 &mac_enforce_fs, 0, "Enforce MAC policy on file system objects");
118TUNABLE_INT("security.mac.enforce_fs", &mac_enforce_fs);
119
120static int mac_enforce_network = 1;
121SYSCTL_INT(_security_mac, OID_AUTO, enforce_network, CTLFLAG_RW,
122 &mac_enforce_network, 0, "Enforce MAC policy on network packets");
123TUNABLE_INT("security.mac.enforce_network", &mac_enforce_network);
124
125static int mac_enforce_pipe = 1;
126SYSCTL_INT(_security_mac, OID_AUTO, enforce_pipe, CTLFLAG_RW,
127 &mac_enforce_pipe, 0, "Enforce MAC policy on pipe operations");
128TUNABLE_INT("security.mac.enforce_pipe", &mac_enforce_pipe);
129
130static int mac_enforce_process = 1;
131SYSCTL_INT(_security_mac, OID_AUTO, enforce_process, CTLFLAG_RW,
132 &mac_enforce_process, 0, "Enforce MAC policy on inter-process operations");
133TUNABLE_INT("security.mac.enforce_process", &mac_enforce_process);
134
135static int mac_enforce_socket = 1;
136SYSCTL_INT(_security_mac, OID_AUTO, enforce_socket, CTLFLAG_RW,
137 &mac_enforce_socket, 0, "Enforce MAC policy on socket operations");
138TUNABLE_INT("security.mac.enforce_socket", &mac_enforce_socket);
139
140static int mac_enforce_vm = 1;
141SYSCTL_INT(_security_mac, OID_AUTO, enforce_vm, CTLFLAG_RW,
142 &mac_enforce_vm, 0, "Enforce MAC policy on vm operations");
143TUNABLE_INT("security.mac.enforce_vm", &mac_enforce_vm);
144
145static int mac_label_size = sizeof(struct mac);
146SYSCTL_INT(_security_mac, OID_AUTO, label_size, CTLFLAG_RD,
147 &mac_label_size, 0, "Pre-compiled MAC label size");
148
149static int mac_cache_fslabel_in_vnode = 1;
150SYSCTL_INT(_security_mac, OID_AUTO, cache_fslabel_in_vnode, CTLFLAG_RW,
151 &mac_cache_fslabel_in_vnode, 0, "Cache mount fslabel in vnode");
152TUNABLE_INT("security.mac.cache_fslabel_in_vnode",
153 &mac_cache_fslabel_in_vnode);
154
155static int mac_vnode_label_cache_hits = 0;
156SYSCTL_INT(_security_mac, OID_AUTO, vnode_label_cache_hits, CTLFLAG_RD,
157 &mac_vnode_label_cache_hits, 0, "Cache hits on vnode labels");
158static int mac_vnode_label_cache_misses = 0;
159SYSCTL_INT(_security_mac, OID_AUTO, vnode_label_cache_misses, CTLFLAG_RD,
160 &mac_vnode_label_cache_misses, 0, "Cache misses on vnode labels");
161
162static int mac_mmap_revocation = 1;
163SYSCTL_INT(_security_mac, OID_AUTO, mmap_revocation, CTLFLAG_RW,
164 &mac_mmap_revocation, 0, "Revoke mmap access to files on subject "
165 "relabel");
166static int mac_mmap_revocation_via_cow = 0;
167SYSCTL_INT(_security_mac, OID_AUTO, mmap_revocation_via_cow, CTLFLAG_RW,
168 &mac_mmap_revocation_via_cow, 0, "Revoke mmap access to files via "
169 "copy-on-write semantics, or by removing all write access");
170
171#ifdef MAC_DEBUG
172SYSCTL_NODE(_security_mac, OID_AUTO, debug, CTLFLAG_RW, 0,
173 "TrustedBSD MAC debug info");
174
175static int mac_debug_label_fallback = 0;
176SYSCTL_INT(_security_mac_debug, OID_AUTO, label_fallback, CTLFLAG_RW,
177 &mac_debug_label_fallback, 0, "Filesystems should fall back to fs label"
178 "when label is corrupted.");
179TUNABLE_INT("security.mac.debug_label_fallback",
180 &mac_debug_label_fallback);
181
182SYSCTL_NODE(_security_mac_debug, OID_AUTO, counters, CTLFLAG_RW, 0,
183 "TrustedBSD MAC object counters");
184
185static unsigned int nmacmbufs, nmaccreds, nmacifnets, nmacbpfdescs,
186 nmacsockets, nmacmounts, nmactemp, nmacvnodes, nmacdevfsdirents,
187 nmacipqs, nmacpipes;
188
189SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, mbufs, CTLFLAG_RD,
190 &nmacmbufs, 0, "number of mbufs in use");
191SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, creds, CTLFLAG_RD,
192 &nmaccreds, 0, "number of ucreds in use");
193SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, ifnets, CTLFLAG_RD,
194 &nmacifnets, 0, "number of ifnets in use");
195SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, ipqs, CTLFLAG_RD,
196 &nmacipqs, 0, "number of ipqs in use");
197SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, bpfdescs, CTLFLAG_RD,
198 &nmacbpfdescs, 0, "number of bpfdescs in use");
199SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, sockets, CTLFLAG_RD,
200 &nmacsockets, 0, "number of sockets in use");
201SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, pipes, CTLFLAG_RD,
202 &nmacpipes, 0, "number of pipes in use");
203SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, mounts, CTLFLAG_RD,
204 &nmacmounts, 0, "number of mounts in use");
205SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, temp, CTLFLAG_RD,
206 &nmactemp, 0, "number of temporary labels in use");
207SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, vnodes, CTLFLAG_RD,
208 &nmacvnodes, 0, "number of vnodes in use");
209SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, devfsdirents, CTLFLAG_RD,
210 &nmacdevfsdirents, 0, "number of devfs dirents inuse");
211#endif
212
213static int error_select(int error1, int error2);
214static int mac_externalize(struct label *label, struct mac *mac);
215static int mac_policy_register(struct mac_policy_conf *mpc);
216static int mac_policy_unregister(struct mac_policy_conf *mpc);
217
218static int mac_stdcreatevnode_ea(struct vnode *vp);
219static void mac_check_vnode_mmap_downgrade(struct ucred *cred,
220 struct vnode *vp, int *prot);
221static void mac_cred_mmapped_drop_perms_recurse(struct thread *td,
222 struct ucred *cred, struct vm_map *map);
223
224static void mac_destroy_socket_label(struct label *label);
225
226MALLOC_DEFINE(M_MACOPVEC, "macopvec", "MAC policy operation vector");
227MALLOC_DEFINE(M_MACPIPELABEL, "macpipelabel", "MAC labels for pipes");
228
229/*
230 * mac_policy_list_lock protects the consistency of 'mac_policy_list',
231 * the linked list of attached policy modules. Read-only consumers of
232 * the list must acquire a shared lock for the duration of their use;
233 * writers must acquire an exclusive lock. Note that for compound
234 * operations, locks should be held for the entire compound operation,
235 * and that this is not yet done for relabel requests.
236 */
237static struct mtx mac_policy_list_lock;
238static LIST_HEAD(, mac_policy_conf) mac_policy_list;
239static int mac_policy_list_busy;
240#define MAC_POLICY_LIST_LOCKINIT() mtx_init(&mac_policy_list_lock, \
241 "mac_policy_list_lock", NULL, MTX_DEF);
242#define MAC_POLICY_LIST_LOCK() mtx_lock(&mac_policy_list_lock);
243#define MAC_POLICY_LIST_UNLOCK() mtx_unlock(&mac_policy_list_lock);
244
245#define MAC_POLICY_LIST_BUSY() do { \
246 MAC_POLICY_LIST_LOCK(); \
247 mac_policy_list_busy++; \
248 MAC_POLICY_LIST_UNLOCK(); \
249} while (0)
250
251#define MAC_POLICY_LIST_UNBUSY() do { \
252 MAC_POLICY_LIST_LOCK(); \
253 mac_policy_list_busy--; \
254 if (mac_policy_list_busy < 0) \
255 panic("Extra mac_policy_list_busy--"); \
256 MAC_POLICY_LIST_UNLOCK(); \
257} while (0)
258
259/*
260 * MAC_CHECK performs the designated check by walking the policy
261 * module list and checking with each as to how it feels about the
262 * request. Note that it returns its value via 'error' in the scope
263 * of the caller.
264 */
265#define MAC_CHECK(check, args...) do { \
266 struct mac_policy_conf *mpc; \
267 \
268 error = 0; \
269 MAC_POLICY_LIST_BUSY(); \
270 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \
271 if (mpc->mpc_ops->mpo_ ## check != NULL) \
272 error = error_select( \
273 mpc->mpc_ops->mpo_ ## check (args), \
274 error); \
275 } \
276 MAC_POLICY_LIST_UNBUSY(); \
277} while (0)
278
279/*
280 * MAC_BOOLEAN performs the designated boolean composition by walking
281 * the module list, invoking each instance of the operation, and
282 * combining the results using the passed C operator. Note that it
283 * returns its value via 'result' in the scope of the caller, which
284 * should be initialized by the caller in a meaningful way to get
285 * a meaningful result.
286 */
287#define MAC_BOOLEAN(operation, composition, args...) do { \
288 struct mac_policy_conf *mpc; \
289 \
290 MAC_POLICY_LIST_BUSY(); \
291 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \
292 if (mpc->mpc_ops->mpo_ ## operation != NULL) \
293 result = result composition \
294 mpc->mpc_ops->mpo_ ## operation (args); \
295 } \
296 MAC_POLICY_LIST_UNBUSY(); \
297} while (0)
298
299/*
300 * MAC_PERFORM performs the designated operation by walking the policy
301 * module list and invoking that operation for each policy.
302 */
303#define MAC_PERFORM(operation, args...) do { \
304 struct mac_policy_conf *mpc; \
305 \
306 MAC_POLICY_LIST_BUSY(); \
307 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \
308 if (mpc->mpc_ops->mpo_ ## operation != NULL) \
309 mpc->mpc_ops->mpo_ ## operation (args); \
310 } \
311 MAC_POLICY_LIST_UNBUSY(); \
312} while (0)
313
314/*
315 * Initialize the MAC subsystem, including appropriate SMP locks.
316 */
317static void
318mac_init(void)
319{
320
321 LIST_INIT(&mac_policy_list);
322 MAC_POLICY_LIST_LOCKINIT();
323}
324
325/*
326 * For the purposes of modules that want to know if they were loaded
327 * "early", set the mac_late flag once we've processed modules either
328 * linked into the kernel, or loaded before the kernel startup.
329 */
330static void
331mac_late_init(void)
332{
333
334 mac_late = 1;
335}
336
337/*
338 * Allow MAC policy modules to register during boot, etc.
339 */
340int
341mac_policy_modevent(module_t mod, int type, void *data)
342{
343 struct mac_policy_conf *mpc;
344 int error;
345
346 error = 0;
347 mpc = (struct mac_policy_conf *) data;
348
349 switch (type) {
350 case MOD_LOAD:
351 if (mpc->mpc_loadtime_flags & MPC_LOADTIME_FLAG_NOTLATE &&
352 mac_late) {
353 printf("mac_policy_modevent: can't load %s policy "
354 "after booting\n", mpc->mpc_name);
355 error = EBUSY;
356 break;
357 }
358 error = mac_policy_register(mpc);
359 break;
360 case MOD_UNLOAD:
361 /* Don't unregister the module if it was never registered. */
362 if ((mpc->mpc_runtime_flags & MPC_RUNTIME_FLAG_REGISTERED)
363 != 0)
364 error = mac_policy_unregister(mpc);
365 else
366 error = 0;
367 break;
368 default:
369 break;
370 }
371
372 return (error);
373}
374
375static int
376mac_policy_register(struct mac_policy_conf *mpc)
377{
378 struct mac_policy_conf *tmpc;
379 struct mac_policy_op_entry *mpe;
380 int slot;
381
382 MALLOC(mpc->mpc_ops, struct mac_policy_ops *, sizeof(*mpc->mpc_ops),
383 M_MACOPVEC, M_WAITOK | M_ZERO);
384 for (mpe = mpc->mpc_entries; mpe->mpe_constant != MAC_OP_LAST; mpe++) {
385 switch (mpe->mpe_constant) {
386 case MAC_OP_LAST:
387 /*
388 * Doesn't actually happen, but this allows checking
389 * that all enumerated values are handled.
390 */
391 break;
392 case MAC_DESTROY:
393 mpc->mpc_ops->mpo_destroy =
394 mpe->mpe_function;
395 break;
396 case MAC_INIT:
397 mpc->mpc_ops->mpo_init =
398 mpe->mpe_function;
399 break;
400 case MAC_SYSCALL:
401 mpc->mpc_ops->mpo_syscall =
402 mpe->mpe_function;
403 break;
404 case MAC_INIT_BPFDESC_LABEL:
405 mpc->mpc_ops->mpo_init_bpfdesc_label =
406 mpe->mpe_function;
407 break;
408 case MAC_INIT_CRED_LABEL:
409 mpc->mpc_ops->mpo_init_cred_label =
410 mpe->mpe_function;
411 break;
412 case MAC_INIT_DEVFSDIRENT_LABEL:
413 mpc->mpc_ops->mpo_init_devfsdirent_label =
414 mpe->mpe_function;
415 break;
416 case MAC_INIT_IFNET_LABEL:
417 mpc->mpc_ops->mpo_init_ifnet_label =
418 mpe->mpe_function;
419 break;
420 case MAC_INIT_IPQ_LABEL:
421 mpc->mpc_ops->mpo_init_ipq_label =
422 mpe->mpe_function;
423 break;
424 case MAC_INIT_MBUF_LABEL:
425 mpc->mpc_ops->mpo_init_mbuf_label =
426 mpe->mpe_function;
427 break;
428 case MAC_INIT_MOUNT_LABEL:
429 mpc->mpc_ops->mpo_init_mount_label =
430 mpe->mpe_function;
431 break;
432 case MAC_INIT_MOUNT_FS_LABEL:
433 mpc->mpc_ops->mpo_init_mount_fs_label =
434 mpe->mpe_function;
435 break;
436 case MAC_INIT_PIPE_LABEL:
437 mpc->mpc_ops->mpo_init_pipe_label =
438 mpe->mpe_function;
439 break;
440 case MAC_INIT_SOCKET_LABEL:
441 mpc->mpc_ops->mpo_init_socket_label =
442 mpe->mpe_function;
443 break;
444 case MAC_INIT_SOCKET_PEER_LABEL:
445 mpc->mpc_ops->mpo_init_socket_peer_label =
446 mpe->mpe_function;
447 break;
448 case MAC_INIT_TEMP_LABEL:
449 mpc->mpc_ops->mpo_init_temp_label =
450 mpe->mpe_function;
451 break;
452 case MAC_INIT_VNODE_LABEL:
453 mpc->mpc_ops->mpo_init_vnode_label =
454 mpe->mpe_function;
455 break;
456 case MAC_DESTROY_BPFDESC_LABEL:
457 mpc->mpc_ops->mpo_destroy_bpfdesc_label =
458 mpe->mpe_function;
459 break;
460 case MAC_DESTROY_CRED_LABEL:
461 mpc->mpc_ops->mpo_destroy_cred_label =
462 mpe->mpe_function;
463 break;
464 case MAC_DESTROY_DEVFSDIRENT_LABEL:
465 mpc->mpc_ops->mpo_destroy_devfsdirent_label =
466 mpe->mpe_function;
467 break;
468 case MAC_DESTROY_IFNET_LABEL:
469 mpc->mpc_ops->mpo_destroy_ifnet_label =
470 mpe->mpe_function;
471 break;
472 case MAC_DESTROY_IPQ_LABEL:
473 mpc->mpc_ops->mpo_destroy_ipq_label =
474 mpe->mpe_function;
475 break;
476 case MAC_DESTROY_MBUF_LABEL:
477 mpc->mpc_ops->mpo_destroy_mbuf_label =
478 mpe->mpe_function;
479 break;
480 case MAC_DESTROY_MOUNT_LABEL:
481 mpc->mpc_ops->mpo_destroy_mount_label =
482 mpe->mpe_function;
483 break;
484 case MAC_DESTROY_MOUNT_FS_LABEL:
485 mpc->mpc_ops->mpo_destroy_mount_fs_label =
486 mpe->mpe_function;
487 break;
488 case MAC_DESTROY_PIPE_LABEL:
489 mpc->mpc_ops->mpo_destroy_pipe_label =
490 mpe->mpe_function;
491 break;
492 case MAC_DESTROY_SOCKET_LABEL:
493 mpc->mpc_ops->mpo_destroy_socket_label =
494 mpe->mpe_function;
495 break;
496 case MAC_DESTROY_SOCKET_PEER_LABEL:
497 mpc->mpc_ops->mpo_destroy_socket_peer_label =
498 mpe->mpe_function;
499 break;
500 case MAC_DESTROY_TEMP_LABEL:
501 mpc->mpc_ops->mpo_destroy_temp_label =
502 mpe->mpe_function;
503 break;
504 case MAC_DESTROY_VNODE_LABEL:
505 mpc->mpc_ops->mpo_destroy_vnode_label =
506 mpe->mpe_function;
507 break;
508 case MAC_EXTERNALIZE:
509 mpc->mpc_ops->mpo_externalize =
510 mpe->mpe_function;
511 break;
512 case MAC_INTERNALIZE:
513 mpc->mpc_ops->mpo_internalize =
514 mpe->mpe_function;
515 break;
516 case MAC_CREATE_DEVFS_DEVICE:
517 mpc->mpc_ops->mpo_create_devfs_device =
518 mpe->mpe_function;
519 break;
520 case MAC_CREATE_DEVFS_DIRECTORY:
521 mpc->mpc_ops->mpo_create_devfs_directory =
522 mpe->mpe_function;
523 break;
524 case MAC_CREATE_DEVFS_SYMLINK:
525 mpc->mpc_ops->mpo_create_devfs_symlink =
526 mpe->mpe_function;
527 break;
528 case MAC_CREATE_DEVFS_VNODE:
529 mpc->mpc_ops->mpo_create_devfs_vnode =
530 mpe->mpe_function;
531 break;
532 case MAC_STDCREATEVNODE_EA:
533 mpc->mpc_ops->mpo_stdcreatevnode_ea =
534 mpe->mpe_function;
535 break;
536 case MAC_CREATE_VNODE:
537 mpc->mpc_ops->mpo_create_vnode =
538 mpe->mpe_function;
539 break;
540 case MAC_CREATE_MOUNT:
541 mpc->mpc_ops->mpo_create_mount =
542 mpe->mpe_function;
543 break;
544 case MAC_CREATE_ROOT_MOUNT:
545 mpc->mpc_ops->mpo_create_root_mount =
546 mpe->mpe_function;
547 break;
548 case MAC_RELABEL_VNODE:
549 mpc->mpc_ops->mpo_relabel_vnode =
550 mpe->mpe_function;
551 break;
552 case MAC_UPDATE_DEVFSDIRENT:
553 mpc->mpc_ops->mpo_update_devfsdirent =
554 mpe->mpe_function;
555 break;
556 case MAC_UPDATE_PROCFSVNODE:
557 mpc->mpc_ops->mpo_update_procfsvnode =
558 mpe->mpe_function;
559 break;
560 case MAC_UPDATE_VNODE_FROM_EXTATTR:
561 mpc->mpc_ops->mpo_update_vnode_from_extattr =
562 mpe->mpe_function;
563 break;
564 case MAC_UPDATE_VNODE_FROM_EXTERNALIZED:
565 mpc->mpc_ops->mpo_update_vnode_from_externalized =
566 mpe->mpe_function;
567 break;
568 case MAC_UPDATE_VNODE_FROM_MOUNT:
569 mpc->mpc_ops->mpo_update_vnode_from_mount =
570 mpe->mpe_function;
571 break;
572 case MAC_CREATE_MBUF_FROM_SOCKET:
573 mpc->mpc_ops->mpo_create_mbuf_from_socket =
574 mpe->mpe_function;
575 break;
576 case MAC_CREATE_PIPE:
577 mpc->mpc_ops->mpo_create_pipe =
578 mpe->mpe_function;
579 break;
580 case MAC_CREATE_SOCKET:
581 mpc->mpc_ops->mpo_create_socket =
582 mpe->mpe_function;
583 break;
584 case MAC_CREATE_SOCKET_FROM_SOCKET:
585 mpc->mpc_ops->mpo_create_socket_from_socket =
586 mpe->mpe_function;
587 break;
588 case MAC_RELABEL_PIPE:
589 mpc->mpc_ops->mpo_relabel_pipe =
590 mpe->mpe_function;
591 break;
592 case MAC_RELABEL_SOCKET:
593 mpc->mpc_ops->mpo_relabel_socket =
594 mpe->mpe_function;
595 break;
596 case MAC_SET_SOCKET_PEER_FROM_MBUF:
597 mpc->mpc_ops->mpo_set_socket_peer_from_mbuf =
598 mpe->mpe_function;
599 break;
600 case MAC_SET_SOCKET_PEER_FROM_SOCKET:
601 mpc->mpc_ops->mpo_set_socket_peer_from_socket =
602 mpe->mpe_function;
603 break;
604 case MAC_CREATE_BPFDESC:
605 mpc->mpc_ops->mpo_create_bpfdesc =
606 mpe->mpe_function;
607 break;
608 case MAC_CREATE_DATAGRAM_FROM_IPQ:
609 mpc->mpc_ops->mpo_create_datagram_from_ipq =
610 mpe->mpe_function;
611 break;
612 case MAC_CREATE_FRAGMENT:
613 mpc->mpc_ops->mpo_create_fragment =
614 mpe->mpe_function;
615 break;
616 case MAC_CREATE_IFNET:
617 mpc->mpc_ops->mpo_create_ifnet =
618 mpe->mpe_function;
619 break;
620 case MAC_CREATE_IPQ:
621 mpc->mpc_ops->mpo_create_ipq =
622 mpe->mpe_function;
623 break;
624 case MAC_CREATE_MBUF_FROM_MBUF:
625 mpc->mpc_ops->mpo_create_mbuf_from_mbuf =
626 mpe->mpe_function;
627 break;
628 case MAC_CREATE_MBUF_LINKLAYER:
629 mpc->mpc_ops->mpo_create_mbuf_linklayer =
630 mpe->mpe_function;
631 break;
632 case MAC_CREATE_MBUF_FROM_BPFDESC:
633 mpc->mpc_ops->mpo_create_mbuf_from_bpfdesc =
634 mpe->mpe_function;
635 break;
636 case MAC_CREATE_MBUF_FROM_IFNET:
637 mpc->mpc_ops->mpo_create_mbuf_from_ifnet =
638 mpe->mpe_function;
639 break;
640 case MAC_CREATE_MBUF_MULTICAST_ENCAP:
641 mpc->mpc_ops->mpo_create_mbuf_multicast_encap =
642 mpe->mpe_function;
643 break;
644 case MAC_CREATE_MBUF_NETLAYER:
645 mpc->mpc_ops->mpo_create_mbuf_netlayer =
646 mpe->mpe_function;
647 break;
648 case MAC_FRAGMENT_MATCH:
649 mpc->mpc_ops->mpo_fragment_match =
650 mpe->mpe_function;
651 break;
652 case MAC_RELABEL_IFNET:
653 mpc->mpc_ops->mpo_relabel_ifnet =
654 mpe->mpe_function;
655 break;
656 case MAC_UPDATE_IPQ:
657 mpc->mpc_ops->mpo_update_ipq =
658 mpe->mpe_function;
659 break;
660 case MAC_CREATE_CRED:
661 mpc->mpc_ops->mpo_create_cred =
662 mpe->mpe_function;
663 break;
664 case MAC_EXECVE_TRANSITION:
665 mpc->mpc_ops->mpo_execve_transition =
666 mpe->mpe_function;
667 break;
668 case MAC_EXECVE_WILL_TRANSITION:
669 mpc->mpc_ops->mpo_execve_will_transition =
670 mpe->mpe_function;
671 break;
672 case MAC_CREATE_PROC0:
673 mpc->mpc_ops->mpo_create_proc0 =
674 mpe->mpe_function;
675 break;
676 case MAC_CREATE_PROC1:
677 mpc->mpc_ops->mpo_create_proc1 =
678 mpe->mpe_function;
679 break;
680 case MAC_RELABEL_CRED:
681 mpc->mpc_ops->mpo_relabel_cred =
682 mpe->mpe_function;
683 break;
684 case MAC_THREAD_USERRET:
685 mpc->mpc_ops->mpo_thread_userret =
686 mpe->mpe_function;
687 break;
688 case MAC_CHECK_BPFDESC_RECEIVE:
689 mpc->mpc_ops->mpo_check_bpfdesc_receive =
690 mpe->mpe_function;
691 break;
692 case MAC_CHECK_CRED_RELABEL:
693 mpc->mpc_ops->mpo_check_cred_relabel =
694 mpe->mpe_function;
695 break;
696 case MAC_CHECK_CRED_VISIBLE:
697 mpc->mpc_ops->mpo_check_cred_visible =
698 mpe->mpe_function;
699 break;
700 case MAC_CHECK_IFNET_RELABEL:
701 mpc->mpc_ops->mpo_check_ifnet_relabel =
702 mpe->mpe_function;
703 break;
704 case MAC_CHECK_IFNET_TRANSMIT:
705 mpc->mpc_ops->mpo_check_ifnet_transmit =
706 mpe->mpe_function;
707 break;
708 case MAC_CHECK_MOUNT_STAT:
709 mpc->mpc_ops->mpo_check_mount_stat =
710 mpe->mpe_function;
711 break;
712 case MAC_CHECK_PIPE_IOCTL:
713 mpc->mpc_ops->mpo_check_pipe_ioctl =
714 mpe->mpe_function;
715 break;
716 case MAC_CHECK_PIPE_POLL:
717 mpc->mpc_ops->mpo_check_pipe_poll =
718 mpe->mpe_function;
719 break;
720 case MAC_CHECK_PIPE_READ:
721 mpc->mpc_ops->mpo_check_pipe_read =
722 mpe->mpe_function;
723 break;
724 case MAC_CHECK_PIPE_RELABEL:
725 mpc->mpc_ops->mpo_check_pipe_relabel =
726 mpe->mpe_function;
727 break;
728 case MAC_CHECK_PIPE_STAT:
729 mpc->mpc_ops->mpo_check_pipe_stat =
730 mpe->mpe_function;
731 break;
732 case MAC_CHECK_PIPE_WRITE:
733 mpc->mpc_ops->mpo_check_pipe_write =
734 mpe->mpe_function;
735 break;
736 case MAC_CHECK_PROC_DEBUG:
737 mpc->mpc_ops->mpo_check_proc_debug =
738 mpe->mpe_function;
739 break;
740 case MAC_CHECK_PROC_SCHED:
741 mpc->mpc_ops->mpo_check_proc_sched =
742 mpe->mpe_function;
743 break;
744 case MAC_CHECK_PROC_SIGNAL:
745 mpc->mpc_ops->mpo_check_proc_signal =
746 mpe->mpe_function;
747 break;
748 case MAC_CHECK_SOCKET_BIND:
749 mpc->mpc_ops->mpo_check_socket_bind =
750 mpe->mpe_function;
751 break;
752 case MAC_CHECK_SOCKET_CONNECT:
753 mpc->mpc_ops->mpo_check_socket_connect =
754 mpe->mpe_function;
755 break;
756 case MAC_CHECK_SOCKET_DELIVER:
757 mpc->mpc_ops->mpo_check_socket_deliver =
758 mpe->mpe_function;
759 break;
760 case MAC_CHECK_SOCKET_LISTEN:
761 mpc->mpc_ops->mpo_check_socket_listen =
762 mpe->mpe_function;
763 break;
764 case MAC_CHECK_SOCKET_RECEIVE:
765 mpc->mpc_ops->mpo_check_socket_receive =
766 mpe->mpe_function;
767 break;
768 case MAC_CHECK_SOCKET_RELABEL:
769 mpc->mpc_ops->mpo_check_socket_relabel =
770 mpe->mpe_function;
771 break;
772 case MAC_CHECK_SOCKET_SEND:
773 mpc->mpc_ops->mpo_check_socket_send =
774 mpe->mpe_function;
775 break;
776 case MAC_CHECK_SOCKET_VISIBLE:
777 mpc->mpc_ops->mpo_check_socket_visible =
778 mpe->mpe_function;
779 break;
780 case MAC_CHECK_VNODE_ACCESS:
781 mpc->mpc_ops->mpo_check_vnode_access =
782 mpe->mpe_function;
783 break;
784 case MAC_CHECK_VNODE_CHDIR:
785 mpc->mpc_ops->mpo_check_vnode_chdir =
786 mpe->mpe_function;
787 break;
788 case MAC_CHECK_VNODE_CHROOT:
789 mpc->mpc_ops->mpo_check_vnode_chroot =
790 mpe->mpe_function;
791 break;
792 case MAC_CHECK_VNODE_CREATE:
793 mpc->mpc_ops->mpo_check_vnode_create =
794 mpe->mpe_function;
795 break;
796 case MAC_CHECK_VNODE_DELETE:
797 mpc->mpc_ops->mpo_check_vnode_delete =
798 mpe->mpe_function;
799 break;
800 case MAC_CHECK_VNODE_DELETEACL:
801 mpc->mpc_ops->mpo_check_vnode_deleteacl =
802 mpe->mpe_function;
803 break;
804 case MAC_CHECK_VNODE_EXEC:
805 mpc->mpc_ops->mpo_check_vnode_exec =
806 mpe->mpe_function;
807 break;
808 case MAC_CHECK_VNODE_GETACL:
809 mpc->mpc_ops->mpo_check_vnode_getacl =
810 mpe->mpe_function;
811 break;
812 case MAC_CHECK_VNODE_GETEXTATTR:
813 mpc->mpc_ops->mpo_check_vnode_getextattr =
814 mpe->mpe_function;
815 break;
816 case MAC_CHECK_VNODE_LINK:
817 mpc->mpc_ops->mpo_check_vnode_link =
818 mpe->mpe_function;
819 break;
820 case MAC_CHECK_VNODE_LOOKUP:
821 mpc->mpc_ops->mpo_check_vnode_lookup =
822 mpe->mpe_function;
823 break;
824 case MAC_CHECK_VNODE_MMAP:
825 mpc->mpc_ops->mpo_check_vnode_mmap =
826 mpe->mpe_function;
827 break;
828 case MAC_CHECK_VNODE_MMAP_DOWNGRADE:
829 mpc->mpc_ops->mpo_check_vnode_mmap_downgrade =
830 mpe->mpe_function;
831 break;
832 case MAC_CHECK_VNODE_MPROTECT:
833 mpc->mpc_ops->mpo_check_vnode_mprotect =
834 mpe->mpe_function;
835 break;
836 case MAC_CHECK_VNODE_OPEN:
837 mpc->mpc_ops->mpo_check_vnode_open =
838 mpe->mpe_function;
839 break;
840 case MAC_CHECK_VNODE_POLL:
841 mpc->mpc_ops->mpo_check_vnode_poll =
842 mpe->mpe_function;
843 break;
844 case MAC_CHECK_VNODE_READ:
845 mpc->mpc_ops->mpo_check_vnode_read =
846 mpe->mpe_function;
847 break;
848 case MAC_CHECK_VNODE_READDIR:
849 mpc->mpc_ops->mpo_check_vnode_readdir =
850 mpe->mpe_function;
851 break;
852 case MAC_CHECK_VNODE_READLINK:
853 mpc->mpc_ops->mpo_check_vnode_readlink =
854 mpe->mpe_function;
855 break;
856 case MAC_CHECK_VNODE_RELABEL:
857 mpc->mpc_ops->mpo_check_vnode_relabel =
858 mpe->mpe_function;
859 break;
860 case MAC_CHECK_VNODE_RENAME_FROM:
861 mpc->mpc_ops->mpo_check_vnode_rename_from =
862 mpe->mpe_function;
863 break;
864 case MAC_CHECK_VNODE_RENAME_TO:
865 mpc->mpc_ops->mpo_check_vnode_rename_to =
866 mpe->mpe_function;
867 break;
868 case MAC_CHECK_VNODE_REVOKE:
869 mpc->mpc_ops->mpo_check_vnode_revoke =
870 mpe->mpe_function;
871 break;
872 case MAC_CHECK_VNODE_SETACL:
873 mpc->mpc_ops->mpo_check_vnode_setacl =
874 mpe->mpe_function;
875 break;
876 case MAC_CHECK_VNODE_SETEXTATTR:
877 mpc->mpc_ops->mpo_check_vnode_setextattr =
878 mpe->mpe_function;
879 break;
880 case MAC_CHECK_VNODE_SETFLAGS:
881 mpc->mpc_ops->mpo_check_vnode_setflags =
882 mpe->mpe_function;
883 break;
884 case MAC_CHECK_VNODE_SETMODE:
885 mpc->mpc_ops->mpo_check_vnode_setmode =
886 mpe->mpe_function;
887 break;
888 case MAC_CHECK_VNODE_SETOWNER:
889 mpc->mpc_ops->mpo_check_vnode_setowner =
890 mpe->mpe_function;
891 break;
892 case MAC_CHECK_VNODE_SETUTIMES:
893 mpc->mpc_ops->mpo_check_vnode_setutimes =
894 mpe->mpe_function;
895 break;
896 case MAC_CHECK_VNODE_STAT:
897 mpc->mpc_ops->mpo_check_vnode_stat =
898 mpe->mpe_function;
899 break;
900 case MAC_CHECK_VNODE_WRITE:
901 mpc->mpc_ops->mpo_check_vnode_write =
902 mpe->mpe_function;
903 break;
904/*
905 default:
906 printf("MAC policy `%s': unknown operation %d\n",
907 mpc->mpc_name, mpe->mpe_constant);
908 return (EINVAL);
909*/
910 }
911 }
912 MAC_POLICY_LIST_LOCK();
913 if (mac_policy_list_busy > 0) {
914 MAC_POLICY_LIST_UNLOCK();
915 FREE(mpc->mpc_ops, M_MACOPVEC);
916 mpc->mpc_ops = NULL;
917 return (EBUSY);
918 }
919 LIST_FOREACH(tmpc, &mac_policy_list, mpc_list) {
920 if (strcmp(tmpc->mpc_name, mpc->mpc_name) == 0) {
921 MAC_POLICY_LIST_UNLOCK();
922 FREE(mpc->mpc_ops, M_MACOPVEC);
923 mpc->mpc_ops = NULL;
924 return (EEXIST);
925 }
926 }
927 if (mpc->mpc_field_off != NULL) {
928 slot = ffs(mac_policy_offsets_free);
929 if (slot == 0) {
930 MAC_POLICY_LIST_UNLOCK();
931 FREE(mpc->mpc_ops, M_MACOPVEC);
932 mpc->mpc_ops = NULL;
933 return (ENOMEM);
934 }
935 slot--;
936 mac_policy_offsets_free &= ~(1 << slot);
937 *mpc->mpc_field_off = slot;
938 }
939 mpc->mpc_runtime_flags |= MPC_RUNTIME_FLAG_REGISTERED;
940 LIST_INSERT_HEAD(&mac_policy_list, mpc, mpc_list);
941
942 /* Per-policy initialization. */
943 if (mpc->mpc_ops->mpo_init != NULL)
944 (*(mpc->mpc_ops->mpo_init))(mpc);
945 MAC_POLICY_LIST_UNLOCK();
946
947 printf("Security policy loaded: %s (%s)\n", mpc->mpc_fullname,
948 mpc->mpc_name);
949
950 return (0);
951}
952
953static int
954mac_policy_unregister(struct mac_policy_conf *mpc)
955{
956
957 /*
958 * If we fail the load, we may get a request to unload. Check
959 * to see if we did the run-time registration, and if not,
960 * silently succeed.
961 */
962 MAC_POLICY_LIST_LOCK();
963 if ((mpc->mpc_runtime_flags & MPC_RUNTIME_FLAG_REGISTERED) == 0) {
964 MAC_POLICY_LIST_UNLOCK();
965 return (0);
966 }
967#if 0
968 /*
969 * Don't allow unloading modules with private data.
970 */
971 if (mpc->mpc_field_off != NULL) {
972 MAC_POLICY_LIST_UNLOCK();
973 return (EBUSY);
974 }
975#endif
976 /*
977 * Only allow the unload to proceed if the module is unloadable
978 * by its own definition.
979 */
980 if ((mpc->mpc_loadtime_flags & MPC_LOADTIME_FLAG_UNLOADOK) == 0) {
981 MAC_POLICY_LIST_UNLOCK();
982 return (EBUSY);
983 }
984 /*
985 * Right now, we EBUSY if the list is in use. In the future,
986 * for reliability reasons, we might want to sleep and wakeup
987 * later to try again.
988 */
989 if (mac_policy_list_busy > 0) {
990 MAC_POLICY_LIST_UNLOCK();
991 return (EBUSY);
992 }
993 if (mpc->mpc_ops->mpo_destroy != NULL)
994 (*(mpc->mpc_ops->mpo_destroy))(mpc);
995
996 LIST_REMOVE(mpc, mpc_list);
997 MAC_POLICY_LIST_UNLOCK();
998
999 FREE(mpc->mpc_ops, M_MACOPVEC);
1000 mpc->mpc_ops = NULL;
1001 mpc->mpc_runtime_flags &= ~MPC_RUNTIME_FLAG_REGISTERED;
1002
1003 printf("Security policy unload: %s (%s)\n", mpc->mpc_fullname,
1004 mpc->mpc_name);
1005
1006 return (0);
1007}
1008
1009/*
1010 * Define an error value precedence, and given two arguments, selects the
1011 * value with the higher precedence.
1012 */
1013static int
1014error_select(int error1, int error2)
1015{
1016
1017 /* Certain decision-making errors take top priority. */
1018 if (error1 == EDEADLK || error2 == EDEADLK)
1019 return (EDEADLK);
1020
1021 /* Invalid arguments should be reported where possible. */
1022 if (error1 == EINVAL || error2 == EINVAL)
1023 return (EINVAL);
1024
1025 /* Precedence goes to "visibility", with both process and file. */
1026 if (error1 == ESRCH || error2 == ESRCH)
1027 return (ESRCH);
1028
1029 if (error1 == ENOENT || error2 == ENOENT)
1030 return (ENOENT);
1031
1032 /* Precedence goes to DAC/MAC protections. */
1033 if (error1 == EACCES || error2 == EACCES)
1034 return (EACCES);
1035
1036 /* Precedence goes to privilege. */
1037 if (error1 == EPERM || error2 == EPERM)
1038 return (EPERM);
1039
1040 /* Precedence goes to error over success; otherwise, arbitrary. */
1041 if (error1 != 0)
1042 return (error1);
1043 return (error2);
1044}
1045
1046static void
1047mac_init_label(struct label *label)
1048{
1049
1050 bzero(label, sizeof(*label));
1051 label->l_flags = MAC_FLAG_INITIALIZED;
1052}
1053
1054static void
1055mac_destroy_label(struct label *label)
1056{
1057
1058 KASSERT(label->l_flags & MAC_FLAG_INITIALIZED,
1059 ("destroying uninitialized label"));
1060
1061 bzero(label, sizeof(*label));
1062 /* implicit: label->l_flags &= ~MAC_FLAG_INITIALIZED; */
1063}
1064
1065static void
1066mac_init_structmac(struct mac *mac)
1067{
1068
1069 bzero(mac, sizeof(*mac));
1070 mac->m_macflags = MAC_FLAG_INITIALIZED;
1071}
1072
1073void
1074mac_init_bpfdesc(struct bpf_d *bpf_d)
1075{
1076
1077 mac_init_label(&bpf_d->bd_label);
1078 MAC_PERFORM(init_bpfdesc_label, &bpf_d->bd_label);
1079#ifdef MAC_DEBUG
1080 atomic_add_int(&nmacbpfdescs, 1);
1081#endif
1082}
1083
1084void
1085mac_init_cred(struct ucred *cr)
1086{
1087
1088 mac_init_label(&cr->cr_label);
1089 MAC_PERFORM(init_cred_label, &cr->cr_label);
1090#ifdef MAC_DEBUG
1091 atomic_add_int(&nmaccreds, 1);
1092#endif
1093}
1094
1095void
1096mac_init_devfsdirent(struct devfs_dirent *de)
1097{
1098
1099 mac_init_label(&de->de_label);
1100 MAC_PERFORM(init_devfsdirent_label, &de->de_label);
1101#ifdef MAC_DEBUG
1102 atomic_add_int(&nmacdevfsdirents, 1);
1103#endif
1104}
1105
1106void
1107mac_init_ifnet(struct ifnet *ifp)
1108{
1109
1110 mac_init_label(&ifp->if_label);
1111 MAC_PERFORM(init_ifnet_label, &ifp->if_label);
1112#ifdef MAC_DEBUG
1113 atomic_add_int(&nmacifnets, 1);
1114#endif
1115}
1116
1117void
1118mac_init_ipq(struct ipq *ipq)
1119{
1120
1121 mac_init_label(&ipq->ipq_label);
1122 MAC_PERFORM(init_ipq_label, &ipq->ipq_label);
1123#ifdef MAC_DEBUG
1124 atomic_add_int(&nmacipqs, 1);
1125#endif
1126}
1127
1128int
1129mac_init_mbuf(struct mbuf *m, int flag)
1130{
1131 int error;
1132
1133 KASSERT(m->m_flags & M_PKTHDR, ("mac_init_mbuf on non-header mbuf"));
1134
1135 mac_init_label(&m->m_pkthdr.label);
1136
1137 MAC_CHECK(init_mbuf_label, &m->m_pkthdr.label, flag);
1138 if (error) {
1139 MAC_PERFORM(destroy_mbuf_label, &m->m_pkthdr.label);
1140 mac_destroy_label(&m->m_pkthdr.label);
1141 }
1142
1143#ifdef MAC_DEBUG
1144 if (error == 0)
1145 atomic_add_int(&nmacmbufs, 1);
1146#endif
1147 return (error);
1148}
1149
1150void
1151mac_init_mount(struct mount *mp)
1152{
1153
1154 mac_init_label(&mp->mnt_mntlabel);
1155 mac_init_label(&mp->mnt_fslabel);
1156 MAC_PERFORM(init_mount_label, &mp->mnt_mntlabel);
1157 MAC_PERFORM(init_mount_fs_label, &mp->mnt_fslabel);
1158#ifdef MAC_DEBUG
1159 atomic_add_int(&nmacmounts, 1);
1160#endif
1161}
1162
1163void
1164mac_init_pipe(struct pipe *pipe)
1165{
1166 struct label *label;
1167
1168 label = malloc(sizeof(struct label), M_MACPIPELABEL, M_ZERO|M_WAITOK);
1169 mac_init_label(label);
1170 pipe->pipe_label = label;
1171 pipe->pipe_peer->pipe_label = label;
1172 MAC_PERFORM(init_pipe_label, pipe->pipe_label);
1173#ifdef MAC_DEBUG
1174 atomic_add_int(&nmacpipes, 1);
1175#endif
1176}
1177
1178static int
1179mac_init_socket_label(struct label *label, int flag)
1180{
1181 int error;
1182
1183 mac_init_label(label);
1184
1185 MAC_CHECK(init_socket_label, label, flag);
1186 if (error) {
1187 MAC_PERFORM(destroy_socket_label, label);
1188 mac_destroy_label(label);
1189 }
1190
1191#ifdef MAC_DEBUG
1192 if (error == 0)
1193 atomic_add_int(&nmacsockets, 1);
1194#endif
1195
1196 return (error);
1197}
1198
1199static int
1200mac_init_socket_peer_label(struct label *label, int flag)
1201{
1202 int error;
1203
1204 mac_init_label(label);
1205
1206 MAC_CHECK(init_socket_peer_label, label, flag);
1207 if (error) {
1208 MAC_PERFORM(destroy_socket_label, label);
1209 mac_destroy_label(label);
1210 }
1211
1212 return (error);
1213}
1214
1215int
1216mac_init_socket(struct socket *socket, int flag)
1217{
1218 int error;
1219
1220 error = mac_init_socket_label(&socket->so_label, flag);
1221 if (error)
1222 return (error);
1223
1224 error = mac_init_socket_peer_label(&socket->so_peerlabel, flag);
1225 if (error)
1226 mac_destroy_socket_label(&socket->so_label);
1227
1228 return (error);
1229}
1230
1231static void
1232mac_init_temp(struct label *label)
1233{
1234
1235 mac_init_label(label);
1236 MAC_PERFORM(init_temp_label, label);
1237#ifdef MAC_DEBUG
1238 atomic_add_int(&nmactemp, 1);
1239#endif
1240}
1241
1242void
1243mac_init_vnode(struct vnode *vp)
1244{
1245
1246 mac_init_label(&vp->v_label);
1247 MAC_PERFORM(init_vnode_label, &vp->v_label);
1248#ifdef MAC_DEBUG
1249 atomic_add_int(&nmacvnodes, 1);
1250#endif
1251}
1252
1253void
1254mac_destroy_bpfdesc(struct bpf_d *bpf_d)
1255{
1256
1257 MAC_PERFORM(destroy_bpfdesc_label, &bpf_d->bd_label);
1258 mac_destroy_label(&bpf_d->bd_label);
1259#ifdef MAC_DEBUG
1260 atomic_subtract_int(&nmacbpfdescs, 1);
1261#endif
1262}
1263
1264void
1265mac_destroy_cred(struct ucred *cr)
1266{
1267
1268 MAC_PERFORM(destroy_cred_label, &cr->cr_label);
1269 mac_destroy_label(&cr->cr_label);
1270#ifdef MAC_DEBUG
1271 atomic_subtract_int(&nmaccreds, 1);
1272#endif
1273}
1274
1275void
1276mac_destroy_devfsdirent(struct devfs_dirent *de)
1277{
1278
1279 MAC_PERFORM(destroy_devfsdirent_label, &de->de_label);
1280 mac_destroy_label(&de->de_label);
1281#ifdef MAC_DEBUG
1282 atomic_subtract_int(&nmacdevfsdirents, 1);
1283#endif
1284}
1285
1286void
1287mac_destroy_ifnet(struct ifnet *ifp)
1288{
1289
1290 MAC_PERFORM(destroy_ifnet_label, &ifp->if_label);
1291 mac_destroy_label(&ifp->if_label);
1292#ifdef MAC_DEBUG
1293 atomic_subtract_int(&nmacifnets, 1);
1294#endif
1295}
1296
1297void
1298mac_destroy_ipq(struct ipq *ipq)
1299{
1300
1301 MAC_PERFORM(destroy_ipq_label, &ipq->ipq_label);
1302 mac_destroy_label(&ipq->ipq_label);
1303#ifdef MAC_DEBUG
1304 atomic_subtract_int(&nmacipqs, 1);
1305#endif
1306}
1307
1308void
1309mac_destroy_mbuf(struct mbuf *m)
1310{
1311
1312 MAC_PERFORM(destroy_mbuf_label, &m->m_pkthdr.label);
1313 mac_destroy_label(&m->m_pkthdr.label);
1314#ifdef MAC_DEBUG
1315 atomic_subtract_int(&nmacmbufs, 1);
1316#endif
1317}
1318
1319void
1320mac_destroy_mount(struct mount *mp)
1321{
1322
1323 MAC_PERFORM(destroy_mount_label, &mp->mnt_mntlabel);
1324 MAC_PERFORM(destroy_mount_fs_label, &mp->mnt_fslabel);
1325 mac_destroy_label(&mp->mnt_fslabel);
1326 mac_destroy_label(&mp->mnt_mntlabel);
1327#ifdef MAC_DEBUG
1328 atomic_subtract_int(&nmacmounts, 1);
1329#endif
1330}
1331
1332void
1333mac_destroy_pipe(struct pipe *pipe)
1334{
1335
1336 MAC_PERFORM(destroy_pipe_label, pipe->pipe_label);
1337 mac_destroy_label(pipe->pipe_label);
1338 free(pipe->pipe_label, M_MACPIPELABEL);
1339#ifdef MAC_DEBUG
1340 atomic_subtract_int(&nmacpipes, 1);
1341#endif
1342}
1343
1344static void
1345mac_destroy_socket_label(struct label *label)
1346{
1347
1348 MAC_PERFORM(destroy_socket_label, label);
1349 mac_destroy_label(label);
1350#ifdef MAC_DEBUG
1351 atomic_subtract_int(&nmacsockets, 1);
1352#endif
1353}
1354
1355static void
1356mac_destroy_socket_peer_label(struct label *label)
1357{
1358
1359 MAC_PERFORM(destroy_socket_peer_label, label);
1360 mac_destroy_label(label);
1361}
1362
1363void
1364mac_destroy_socket(struct socket *socket)
1365{
1366
1367 mac_destroy_socket_label(&socket->so_label);
1368 mac_destroy_socket_peer_label(&socket->so_peerlabel);
1369}
1370
1371static void
1372mac_destroy_temp(struct label *label)
1373{
1374
1375 MAC_PERFORM(destroy_temp_label, label);
1376 mac_destroy_label(label);
1377#ifdef MAC_DEBUG
1378 atomic_subtract_int(&nmactemp, 1);
1379#endif
1380}
1381
1382void
1383mac_destroy_vnode(struct vnode *vp)
1384{
1385
1386 MAC_PERFORM(destroy_vnode_label, &vp->v_label);
1387 mac_destroy_label(&vp->v_label);
1388#ifdef MAC_DEBUG
1389 atomic_subtract_int(&nmacvnodes, 1);
1390#endif
1391}
1392
1393static int
1394mac_externalize(struct label *label, struct mac *mac)
1395{
1396 int error;
1397
1398 mac_init_structmac(mac);
1399 MAC_CHECK(externalize, label, mac);
1400
1401 return (error);
1402}
1403
1404static int
1405mac_internalize(struct label *label, struct mac *mac)
1406{
1407 int error;
1408
1409 mac_init_temp(label);
1410 MAC_CHECK(internalize, label, mac);
1411 if (error)
1412 mac_destroy_temp(label);
1413
1414 return (error);
1415}
1416
1417/*
1418 * Initialize MAC label for the first kernel process, from which other
1419 * kernel processes and threads are spawned.
1420 */
1421void
1422mac_create_proc0(struct ucred *cred)
1423{
1424
1425 MAC_PERFORM(create_proc0, cred);
1426}
1427
1428/*
1429 * Initialize MAC label for the first userland process, from which other
1430 * userland processes and threads are spawned.
1431 */
1432void
1433mac_create_proc1(struct ucred *cred)
1434{
1435
1436 MAC_PERFORM(create_proc1, cred);
1437}
1438
1439void
1440mac_thread_userret(struct thread *td)
1441{
1442
1443 MAC_PERFORM(thread_userret, td);
1444}
1445
1446/*
1447 * When a new process is created, its label must be initialized. Generally,
1448 * this involves inheritence from the parent process, modulo possible
1449 * deltas. This function allows that processing to take place.
1450 */
1451void
1452mac_create_cred(struct ucred *parent_cred, struct ucred *child_cred)
1453{
1454
1455 MAC_PERFORM(create_cred, parent_cred, child_cred);
1456}
1457
1458void
1459mac_update_devfsdirent(struct devfs_dirent *de, struct vnode *vp)
1460{
1461
1462 MAC_PERFORM(update_devfsdirent, de, &de->de_label, vp, &vp->v_label);
1463}
1464
1465void
1466mac_update_procfsvnode(struct vnode *vp, struct ucred *cred)
1467{
1468
1469 MAC_PERFORM(update_procfsvnode, vp, &vp->v_label, cred);
1470}
1471
1472/*
1473 * Support callout for policies that manage their own externalization
1474 * using extended attributes.
1475 */
1476static int
1477mac_update_vnode_from_extattr(struct vnode *vp, struct mount *mp)
1478{
1479 int error;
1480
1481 MAC_CHECK(update_vnode_from_extattr, vp, &vp->v_label, mp,
1482 &mp->mnt_fslabel);
1483
1484 return (error);
1485}
1486
1487/*
1488 * Given an externalized mac label, internalize it and stamp it on a
1489 * vnode.
1490 */
1491static int
1492mac_update_vnode_from_externalized(struct vnode *vp, struct mac *extmac)
1493{
1494 int error;
1495
1496 MAC_CHECK(update_vnode_from_externalized, vp, &vp->v_label, extmac);
1497
1498 return (error);
1499}
1500
1501/*
1502 * Call out to individual policies to update the label in a vnode from
1503 * the mountpoint.
1504 */
1505void
1506mac_update_vnode_from_mount(struct vnode *vp, struct mount *mp)
1507{
1508
1509 MAC_PERFORM(update_vnode_from_mount, vp, &vp->v_label, mp,
1510 &mp->mnt_fslabel);
1511
1512 ASSERT_VOP_LOCKED(vp, "mac_update_vnode_from_mount");
1513 if (mac_cache_fslabel_in_vnode)
1514 vp->v_vflag |= VV_CACHEDLABEL;
1515}
1516
1517/*
1518 * Implementation of VOP_REFRESHLABEL() that relies on extended attributes
1519 * to store label data. Can be referenced by filesystems supporting
1520 * extended attributes.
1521 */
1522int
1523vop_stdrefreshlabel_ea(struct vop_refreshlabel_args *ap)
1524{
1525 struct vnode *vp = ap->a_vp;
1526 struct mac extmac;
1527 int buflen, error;
1528
1529 ASSERT_VOP_LOCKED(vp, "vop_stdrefreshlabel_ea");
1530
1531 /*
1532 * Call out to external policies first. Order doesn't really
1533 * matter, as long as failure of one assures failure of all.
1534 */
1535 error = mac_update_vnode_from_extattr(vp, vp->v_mount);
1536 if (error)
1537 return (error);
1538
1539 buflen = sizeof(extmac);
1540 error = vn_extattr_get(vp, IO_NODELOCKED,
1541 FREEBSD_MAC_EXTATTR_NAMESPACE, FREEBSD_MAC_EXTATTR_NAME, &buflen,
1542 (char *)&extmac, curthread);
1543 switch (error) {
1544 case 0:
1545 /* Got it */
1546 break;
1547
1548 case ENOATTR:
1549 /*
1550 * Use the label from the mount point.
1551 */
1552 mac_update_vnode_from_mount(vp, vp->v_mount);
1553 return (0);
1554
1555 case EOPNOTSUPP:
1556 default:
1557 /* Fail horribly. */
1558 return (error);
1559 }
1560
1561 if (buflen != sizeof(extmac))
1562 error = EPERM; /* Fail very closed. */
1563 if (error == 0)
1564 error = mac_update_vnode_from_externalized(vp, &extmac);
1565 if (error == 0)
1566 vp->v_vflag |= VV_CACHEDLABEL;
1567 else {
1568 struct vattr va;
1569
1570 printf("Corrupted label on %s",
1571 vp->v_mount->mnt_stat.f_mntonname);
1572 if (VOP_GETATTR(vp, &va, curthread->td_ucred, curthread) == 0)
1573 printf(" inum %ld", va.va_fileid);
1574#ifdef MAC_DEBUG
1575 if (mac_debug_label_fallback) {
1576 printf(", falling back.\n");
1577 mac_update_vnode_from_mount(vp, vp->v_mount);
1578 error = 0;
1579 } else {
1580#endif
1581 printf(".\n");
1582 error = EPERM;
1583#ifdef MAC_DEBUG
1584 }
1585#endif
1586 }
1587
1588 return (error);
1589}
1590
1591/*
1592 * Make sure the vnode label is up-to-date. If EOPNOTSUPP, then we handle
1593 * the labeling activity outselves. Filesystems should be careful not
1594 * to change their minds regarding whether they support vop_refreshlabel()
1595 * for a vnode or not. Don't cache the vnode here, allow the file
1596 * system code to determine if it's safe to cache. If we update from
1597 * the mount, don't cache since a change to the mount label should affect
1598 * all vnodes.
1599 */
1600static int
1601vn_refreshlabel(struct vnode *vp, struct ucred *cred)
1602{
1603 int error;
1604
1605 ASSERT_VOP_LOCKED(vp, "vn_refreshlabel");
1606
1607 if (vp->v_mount == NULL) {
1608/*
1609 Eventually, we probably want to special-case refreshing
1610 of deadfs vnodes, and if there's a lock-free race somewhere,
1611 that case might be handled here.
1612
1613 mac_update_vnode_deadfs(vp);
1614 return (0);
1615 */
1616 /* printf("vn_refreshlabel: null v_mount\n"); */
1617 if (vp->v_type != VNON)
1618 printf(
1619 "vn_refreshlabel: null v_mount with non-VNON\n");
1620 return (EBADF);
1621 }
1622
1623 if (vp->v_vflag & VV_CACHEDLABEL) {
1624 mac_vnode_label_cache_hits++;
1625 return (0);
1626 } else
1627 mac_vnode_label_cache_misses++;
1628
1629 if ((vp->v_mount->mnt_flag & MNT_MULTILABEL) == 0) {
1630 mac_update_vnode_from_mount(vp, vp->v_mount);
1631 return (0);
1632 }
1633
1634 error = VOP_REFRESHLABEL(vp, cred, curthread);
1635 switch (error) {
1636 case EOPNOTSUPP:
1637 /*
1638 * If labels are not supported on this vnode, fall back to
1639 * the label in the mount and propagate it to the vnode.
1640 * There should probably be some sort of policy/flag/decision
1641 * about doing this.
1642 */
1643 mac_update_vnode_from_mount(vp, vp->v_mount);
1644 error = 0;
1645 default:
1646 return (error);
1647 }
1648}
1649
1650/*
1651 * Helper function for file systems using the vop_std*_ea() calls. This
1652 * function must be called after EA service is available for the vnode,
1653 * but before it's hooked up to the namespace so that the node persists
1654 * if there's a crash, or before it can be accessed. On successful
1655 * commit of the label to disk (etc), do cache the label.
1656 */
1657int
1658vop_stdcreatevnode_ea(struct vnode *dvp, struct vnode *tvp, struct ucred *cred)
1659{
1660 struct mac extmac;
1661 int error;
1662
1663 ASSERT_VOP_LOCKED(tvp, "vop_stdcreatevnode_ea");
1664 if ((dvp->v_mount->mnt_flag & MNT_MULTILABEL) == 0) {
1665 mac_update_vnode_from_mount(tvp, tvp->v_mount);
1666 } else {
1667 error = vn_refreshlabel(dvp, cred);
1668 if (error)
1669 return (error);
1670
1671 /*
1672 * Stick the label in the vnode. Then try to write to
1673 * disk. If we fail, return a failure to abort the
1674 * create operation. Really, this failure shouldn't
1675 * happen except in fairly unusual circumstances (out
1676 * of disk, etc).
1677 */
1678 mac_create_vnode(cred, dvp, tvp);
1679
1680 error = mac_stdcreatevnode_ea(tvp);
1681 if (error)
1682 return (error);
1683
1684 /*
1685 * XXX: Eventually this will go away and all policies will
1686 * directly manage their extended attributes.
1687 */
1688 error = mac_externalize(&tvp->v_label, &extmac);
1689 if (error)
1690 return (error);
1691
1692 error = vn_extattr_set(tvp, IO_NODELOCKED,
1693 FREEBSD_MAC_EXTATTR_NAMESPACE, FREEBSD_MAC_EXTATTR_NAME,
1694 sizeof(extmac), (char *)&extmac, curthread);
1695 if (error == 0)
1696 tvp->v_vflag |= VV_CACHEDLABEL;
1697 else {
1698#if 0
1699 /*
1700 * In theory, we could have fall-back behavior here.
1701 * It would probably be incorrect.
1702 */
1703#endif
1704 return (error);
1705 }
1706 }
1707
1708 return (0);
1709}
1710
1711void
1712mac_execve_transition(struct ucred *old, struct ucred *new, struct vnode *vp)
1713{
1714 int error;
1715
1716 ASSERT_VOP_LOCKED(vp, "mac_execve_transition");
1717
1718 error = vn_refreshlabel(vp, old);
1719 if (error) {
1720 printf("mac_execve_transition: vn_refreshlabel returned %d\n",
1721 error);
1722 printf("mac_execve_transition: using old vnode label\n");
1723 }
1724
1725 MAC_PERFORM(execve_transition, old, new, vp, &vp->v_label);
1726}
1727
1728int
1729mac_execve_will_transition(struct ucred *old, struct vnode *vp)
1730{
1731 int error, result;
1732
1733 error = vn_refreshlabel(vp, old);
1734 if (error)
1735 return (error);
1736
1737 result = 0;
1738 MAC_BOOLEAN(execve_will_transition, ||, old, vp, &vp->v_label);
1739
1740 return (result);
1741}
1742
1743int
1744mac_check_vnode_access(struct ucred *cred, struct vnode *vp, int flags)
1745{
1746 int error;
1747
1748 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_access");
1749
1750 if (!mac_enforce_fs)
1751 return (0);
1752
1753 error = vn_refreshlabel(vp, cred);
1754 if (error)
1755 return (error);
1756
1757 MAC_CHECK(check_vnode_access, cred, vp, &vp->v_label, flags);
1758 return (error);
1759}
1760
1761int
1762mac_check_vnode_chdir(struct ucred *cred, struct vnode *dvp)
1763{
1764 int error;
1765
1766 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_chdir");
1767
1768 if (!mac_enforce_fs)
1769 return (0);
1770
1771 error = vn_refreshlabel(dvp, cred);
1772 if (error)
1773 return (error);
1774
1775 MAC_CHECK(check_vnode_chdir, cred, dvp, &dvp->v_label);
1776 return (error);
1777}
1778
1779int
1780mac_check_vnode_chroot(struct ucred *cred, struct vnode *dvp)
1781{
1782 int error;
1783
1784 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_chroot");
1785
1786 if (!mac_enforce_fs)
1787 return (0);
1788
1789 error = vn_refreshlabel(dvp, cred);
1790 if (error)
1791 return (error);
1792
1793 MAC_CHECK(check_vnode_chroot, cred, dvp, &dvp->v_label);
1794 return (error);
1795}
1796
1797int
1798mac_check_vnode_create(struct ucred *cred, struct vnode *dvp,
1799 struct componentname *cnp, struct vattr *vap)
1800{
1801 int error;
1802
1803 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_create");
1804
1805 if (!mac_enforce_fs)
1806 return (0);
1807
1808 error = vn_refreshlabel(dvp, cred);
1809 if (error)
1810 return (error);
1811
1812 MAC_CHECK(check_vnode_create, cred, dvp, &dvp->v_label, cnp, vap);
1813 return (error);
1814}
1815
1816int
1817mac_check_vnode_delete(struct ucred *cred, struct vnode *dvp, struct vnode *vp,
1818 struct componentname *cnp)
1819{
1820 int error;
1821
1822 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_delete");
1823 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_delete");
1824
1825 if (!mac_enforce_fs)
1826 return (0);
1827
1828 error = vn_refreshlabel(dvp, cred);
1829 if (error)
1830 return (error);
1831 error = vn_refreshlabel(vp, cred);
1832 if (error)
1833 return (error);
1834
1835 MAC_CHECK(check_vnode_delete, cred, dvp, &dvp->v_label, vp,
1836 &vp->v_label, cnp);
1837 return (error);
1838}
1839
1840int
1841mac_check_vnode_deleteacl(struct ucred *cred, struct vnode *vp,
1842 acl_type_t type)
1843{
1844 int error;
1845
1846 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_deleteacl");
1847
1848 if (!mac_enforce_fs)
1849 return (0);
1850
1851 error = vn_refreshlabel(vp, cred);
1852 if (error)
1853 return (error);
1854
1855 MAC_CHECK(check_vnode_deleteacl, cred, vp, &vp->v_label, type);
1856 return (error);
1857}
1858
1859int
1860mac_check_vnode_exec(struct ucred *cred, struct vnode *vp)
1861{
1862 int error;
1863
1864 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_exec");
1865
1866 if (!mac_enforce_process && !mac_enforce_fs)
1867 return (0);
1868
1869 error = vn_refreshlabel(vp, cred);
1870 if (error)
1871 return (error);
1872 MAC_CHECK(check_vnode_exec, cred, vp, &vp->v_label);
1873
1874 return (error);
1875}
1876
1877int
1878mac_check_vnode_getacl(struct ucred *cred, struct vnode *vp, acl_type_t type)
1879{
1880 int error;
1881
1882 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_getacl");
1883
1884 if (!mac_enforce_fs)
1885 return (0);
1886
1887 error = vn_refreshlabel(vp, cred);
1888 if (error)
1889 return (error);
1890
1891 MAC_CHECK(check_vnode_getacl, cred, vp, &vp->v_label, type);
1892 return (error);
1893}
1894
1895int
1896mac_check_vnode_getextattr(struct ucred *cred, struct vnode *vp,
1897 int attrnamespace, const char *name, struct uio *uio)
1898{
1899 int error;
1900
1901 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_getextattr");
1902
1903 if (!mac_enforce_fs)
1904 return (0);
1905
1906 error = vn_refreshlabel(vp, cred);
1907 if (error)
1908 return (error);
1909
1910 MAC_CHECK(check_vnode_getextattr, cred, vp, &vp->v_label,
1911 attrnamespace, name, uio);
1912 return (error);
1913}
1914
1915int
1916mac_check_vnode_link(struct ucred *cred, struct vnode *dvp,
1917 struct vnode *vp, struct componentname *cnp)
1918{
1919
1920 int error;
1921
1922 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_link");
1923 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_link");
1924
1925 if (!mac_enforce_fs)
1926 return (0);
1927
1928 error = vn_refreshlabel(dvp, cred);
1929 if (error)
1930 return (error);
1931
1932 error = vn_refreshlabel(vp, cred);
1933 if (error)
1934 return (error);
1935
1936 MAC_CHECK(check_vnode_link, cred, dvp, &dvp->v_label, vp,
1937 &vp->v_label, cnp);
1938 return (error);
1939}
1940
1941int
1942mac_check_vnode_lookup(struct ucred *cred, struct vnode *dvp,
1943 struct componentname *cnp)
1944{
1945 int error;
1946
1947 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_lookup");
1948
1949 if (!mac_enforce_fs)
1950 return (0);
1951
1952 error = vn_refreshlabel(dvp, cred);
1953 if (error)
1954 return (error);
1955
1956 MAC_CHECK(check_vnode_lookup, cred, dvp, &dvp->v_label, cnp);
1957 return (error);
1958}
1959
1960int
1961mac_check_vnode_mmap(struct ucred *cred, struct vnode *vp, int prot)
1962{
1963 int error;
1964
1965 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mmap");
1966
1967 if (!mac_enforce_fs || !mac_enforce_vm)
1968 return (0);
1969
1970 error = vn_refreshlabel(vp, cred);
1971 if (error)
1972 return (error);
1973
1974 MAC_CHECK(check_vnode_mmap, cred, vp, &vp->v_label, prot);
1975 return (error);
1976}
1977
1978void
1979mac_check_vnode_mmap_downgrade(struct ucred *cred, struct vnode *vp, int *prot)
1980{
1981 int result = *prot;
1982
1983 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mmap_downgrade");
1984
1985 if (!mac_enforce_fs || !mac_enforce_vm)
1986 return;
1987
1988 MAC_PERFORM(check_vnode_mmap_downgrade, cred, vp, &vp->v_label,
1989 &result);
1990
1991 *prot = result;
1992}
1993
1994int
1995mac_check_vnode_mprotect(struct ucred *cred, struct vnode *vp, int prot)
1996{
1997 int error;
1998
1999 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mprotect");
2000
2001 if (!mac_enforce_fs || !mac_enforce_vm)
2002 return (0);
2003
2004 error = vn_refreshlabel(vp, cred);
2005 if (error)
2006 return (error);
2007
2008 MAC_CHECK(check_vnode_mprotect, cred, vp, &vp->v_label, prot);
2009 return (error);
2010}
2011
2012int
2013mac_check_vnode_open(struct ucred *cred, struct vnode *vp, mode_t acc_mode)
2014{
2015 int error;
2016
2017 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_open");
2018
2019 if (!mac_enforce_fs)
2020 return (0);
2021
2022 error = vn_refreshlabel(vp, cred);
2023 if (error)
2024 return (error);
2025
2026 MAC_CHECK(check_vnode_open, cred, vp, &vp->v_label, acc_mode);
2027 return (error);
2028}
2029
2030int
2031mac_check_vnode_poll(struct ucred *active_cred, struct ucred *file_cred,
2032 struct vnode *vp)
2033{
2034 int error;
2035
2036 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_poll");
2037
2038 if (!mac_enforce_fs)
2039 return (0);
2040
2041 error = vn_refreshlabel(vp, active_cred);
2042 if (error)
2043 return (error);
2044
2045 MAC_CHECK(check_vnode_poll, active_cred, file_cred, vp,
2046 &vp->v_label);
2047
2048 return (error);
2049}
2050
2051int
2052mac_check_vnode_read(struct ucred *active_cred, struct ucred *file_cred,
2053 struct vnode *vp)
2054{
2055 int error;
2056
2057 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_read");
2058
2059 if (!mac_enforce_fs)
2060 return (0);
2061
2062 error = vn_refreshlabel(vp, active_cred);
2063 if (error)
2064 return (error);
2065
2066 MAC_CHECK(check_vnode_read, active_cred, file_cred, vp,
2067 &vp->v_label);
2068
2069 return (error);
2070}
2071
2072int
2073mac_check_vnode_readdir(struct ucred *cred, struct vnode *dvp)
2074{
2075 int error;
2076
2077 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_readdir");
2078
2079 if (!mac_enforce_fs)
2080 return (0);
2081
2082 error = vn_refreshlabel(dvp, cred);
2083 if (error)
2084 return (error);
2085
2086 MAC_CHECK(check_vnode_readdir, cred, dvp, &dvp->v_label);
2087 return (error);
2088}
2089
2090int
2091mac_check_vnode_readlink(struct ucred *cred, struct vnode *vp)
2092{
2093 int error;
2094
2095 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_readlink");
2096
2097 if (!mac_enforce_fs)
2098 return (0);
2099
2100 error = vn_refreshlabel(vp, cred);
2101 if (error)
2102 return (error);
2103
2104 MAC_CHECK(check_vnode_readlink, cred, vp, &vp->v_label);
2105 return (error);
2106}
2107
2108static int
2109mac_check_vnode_relabel(struct ucred *cred, struct vnode *vp,
2110 struct label *newlabel)
2111{
2112 int error;
2113
2114 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_relabel");
2115
2116 error = vn_refreshlabel(vp, cred);
2117 if (error)
2118 return (error);
2119
2120 MAC_CHECK(check_vnode_relabel, cred, vp, &vp->v_label, newlabel);
2121
2122 return (error);
2123}
2124
2125int
2126mac_check_vnode_rename_from(struct ucred *cred, struct vnode *dvp,
2127 struct vnode *vp, struct componentname *cnp)
2128{
2129 int error;
2130
2131 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_rename_from");
2132 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_rename_from");
2133
2134 if (!mac_enforce_fs)
2135 return (0);
2136
2137 error = vn_refreshlabel(dvp, cred);
2138 if (error)
2139 return (error);
2140 error = vn_refreshlabel(vp, cred);
2141 if (error)
2142 return (error);
2143
2144 MAC_CHECK(check_vnode_rename_from, cred, dvp, &dvp->v_label, vp,
2145 &vp->v_label, cnp);
2146 return (error);
2147}
2148
2149int
2150mac_check_vnode_rename_to(struct ucred *cred, struct vnode *dvp,
2151 struct vnode *vp, int samedir, struct componentname *cnp)
2152{
2153 int error;
2154
2155 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_rename_to");
2156 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_rename_to");
2157
2158 if (!mac_enforce_fs)
2159 return (0);
2160
2161 error = vn_refreshlabel(dvp, cred);
2162 if (error)
2163 return (error);
2164 if (vp != NULL) {
2165 error = vn_refreshlabel(vp, cred);
2166 if (error)
2167 return (error);
2168 }
2169 MAC_CHECK(check_vnode_rename_to, cred, dvp, &dvp->v_label, vp,
2170 vp != NULL ? &vp->v_label : NULL, samedir, cnp);
2171 return (error);
2172}
2173
2174int
2175mac_check_vnode_revoke(struct ucred *cred, struct vnode *vp)
2176{
2177 int error;
2178
2179 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_revoke");
2180
2181 if (!mac_enforce_fs)
2182 return (0);
2183
2184 error = vn_refreshlabel(vp, cred);
2185 if (error)
2186 return (error);
2187
2188 MAC_CHECK(check_vnode_revoke, cred, vp, &vp->v_label);
2189 return (error);
2190}
2191
2192int
2193mac_check_vnode_setacl(struct ucred *cred, struct vnode *vp, acl_type_t type,
2194 struct acl *acl)
2195{
2196 int error;
2197
2198 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setacl");
2199
2200 if (!mac_enforce_fs)
2201 return (0);
2202
2203 error = vn_refreshlabel(vp, cred);
2204 if (error)
2205 return (error);
2206
2207 MAC_CHECK(check_vnode_setacl, cred, vp, &vp->v_label, type, acl);
2208 return (error);
2209}
2210
2211int
2212mac_check_vnode_setextattr(struct ucred *cred, struct vnode *vp,
2213 int attrnamespace, const char *name, struct uio *uio)
2214{
2215 int error;
2216
2217 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setextattr");
2218
2219 if (!mac_enforce_fs)
2220 return (0);
2221
2222 error = vn_refreshlabel(vp, cred);
2223 if (error)
2224 return (error);
2225
2226 MAC_CHECK(check_vnode_setextattr, cred, vp, &vp->v_label,
2227 attrnamespace, name, uio);
2228 return (error);
2229}
2230
2231int
2232mac_check_vnode_setflags(struct ucred *cred, struct vnode *vp, u_long flags)
2233{
2234 int error;
2235
2236 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setflags");
2237
2238 if (!mac_enforce_fs)
2239 return (0);
2240
2241 error = vn_refreshlabel(vp, cred);
2242 if (error)
2243 return (error);
2244
2245 MAC_CHECK(check_vnode_setflags, cred, vp, &vp->v_label, flags);
2246 return (error);
2247}
2248
2249int
2250mac_check_vnode_setmode(struct ucred *cred, struct vnode *vp, mode_t mode)
2251{
2252 int error;
2253
2254 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setmode");
2255
2256 if (!mac_enforce_fs)
2257 return (0);
2258
2259 error = vn_refreshlabel(vp, cred);
2260 if (error)
2261 return (error);
2262
2263 MAC_CHECK(check_vnode_setmode, cred, vp, &vp->v_label, mode);
2264 return (error);
2265}
2266
2267int
2268mac_check_vnode_setowner(struct ucred *cred, struct vnode *vp, uid_t uid,
2269 gid_t gid)
2270{
2271 int error;
2272
2273 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setowner");
2274
2275 if (!mac_enforce_fs)
2276 return (0);
2277
2278 error = vn_refreshlabel(vp, cred);
2279 if (error)
2280 return (error);
2281
2282 MAC_CHECK(check_vnode_setowner, cred, vp, &vp->v_label, uid, gid);
2283 return (error);
2284}
2285
2286int
2287mac_check_vnode_setutimes(struct ucred *cred, struct vnode *vp,
2288 struct timespec atime, struct timespec mtime)
2289{
2290 int error;
2291
2292 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setutimes");
2293
2294 if (!mac_enforce_fs)
2295 return (0);
2296
2297 error = vn_refreshlabel(vp, cred);
2298 if (error)
2299 return (error);
2300
2301 MAC_CHECK(check_vnode_setutimes, cred, vp, &vp->v_label, atime,
2302 mtime);
2303 return (error);
2304}
2305
2306int
2307mac_check_vnode_stat(struct ucred *active_cred, struct ucred *file_cred,
2308 struct vnode *vp)
2309{
2310 int error;
2311
2312 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_stat");
2313
2314 if (!mac_enforce_fs)
2315 return (0);
2316
2317 error = vn_refreshlabel(vp, active_cred);
2318 if (error)
2319 return (error);
2320
2321 MAC_CHECK(check_vnode_stat, active_cred, file_cred, vp,
2322 &vp->v_label);
2323 return (error);
2324}
2325
2326int
2327mac_check_vnode_write(struct ucred *active_cred, struct ucred *file_cred,
2328 struct vnode *vp)
2329{
2330 int error;
2331
2332 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_write");
2333
2334 if (!mac_enforce_fs)
2335 return (0);
2336
2337 error = vn_refreshlabel(vp, active_cred);
2338 if (error)
2339 return (error);
2340
2341 MAC_CHECK(check_vnode_write, active_cred, file_cred, vp,
2342 &vp->v_label);
2343
2344 return (error);
2345}
2346
2347/*
2348 * When relabeling a process, call out to the policies for the maximum
2349 * permission allowed for each object type we know about in its
2350 * memory space, and revoke access (in the least surprising ways we
2351 * know) when necessary. The process lock is not held here.
2352 */
2353static void
2354mac_cred_mmapped_drop_perms(struct thread *td, struct ucred *cred)
2355{
2356
2357 /* XXX freeze all other threads */
2358 mac_cred_mmapped_drop_perms_recurse(td, cred,
2359 &td->td_proc->p_vmspace->vm_map);
2360 /* XXX allow other threads to continue */
2361}
2362
2363static __inline const char *
2364prot2str(vm_prot_t prot)
2365{
2366
2367 switch (prot & VM_PROT_ALL) {
2368 case VM_PROT_READ:
2369 return ("r--");
2370 case VM_PROT_READ | VM_PROT_WRITE:
2371 return ("rw-");
2372 case VM_PROT_READ | VM_PROT_EXECUTE:
2373 return ("r-x");
2374 case VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE:
2375 return ("rwx");
2376 case VM_PROT_WRITE:
2377 return ("-w-");
2378 case VM_PROT_EXECUTE:
2379 return ("--x");
2380 case VM_PROT_WRITE | VM_PROT_EXECUTE:
2381 return ("-wx");
2382 default:
2383 return ("---");
2384 }
2385}
2386
2387static void
2388mac_cred_mmapped_drop_perms_recurse(struct thread *td, struct ucred *cred,
2389 struct vm_map *map)
2390{
2391 struct vm_map_entry *vme;
2392 int result;
2393 vm_prot_t revokeperms;
2394 vm_object_t object;
2395 vm_ooffset_t offset;
2396 struct vnode *vp;
2397
2398 if (!mac_mmap_revocation)
2399 return;
2400
2401 vm_map_lock_read(map);
2402 for (vme = map->header.next; vme != &map->header; vme = vme->next) {
2403 if (vme->eflags & MAP_ENTRY_IS_SUB_MAP) {
2404 mac_cred_mmapped_drop_perms_recurse(td, cred,
2405 vme->object.sub_map);
2406 continue;
2407 }
2408 /*
2409 * Skip over entries that obviously are not shared.
2410 */
2411 if (vme->eflags & (MAP_ENTRY_COW | MAP_ENTRY_NOSYNC) ||
2412 !vme->max_protection)
2413 continue;
2414 /*
2415 * Drill down to the deepest backing object.
2416 */
2417 offset = vme->offset;
2418 object = vme->object.vm_object;
2419 if (object == NULL)
2420 continue;
2421 while (object->backing_object != NULL) {
2422 object = object->backing_object;
2423 offset += object->backing_object_offset;
2424 }
2425 /*
2426 * At the moment, vm_maps and objects aren't considered
2427 * by the MAC system, so only things with backing by a
2428 * normal object (read: vnodes) are checked.
2429 */
2430 if (object->type != OBJT_VNODE)
2431 continue;
2432 vp = (struct vnode *)object->handle;
2433 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
2434 result = vme->max_protection;
2435 mac_check_vnode_mmap_downgrade(cred, vp, &result);
2436 VOP_UNLOCK(vp, 0, td);
2437 /*
2438 * Find out what maximum protection we may be allowing
2439 * now but a policy needs to get removed.
2440 */
2441 revokeperms = vme->max_protection & ~result;
2442 if (!revokeperms)
2443 continue;
2444 printf("pid %ld: revoking %s perms from %#lx:%ld "
2445 "(max %s/cur %s)\n", (long)td->td_proc->p_pid,
2446 prot2str(revokeperms), (u_long)vme->start,
2447 (long)(vme->end - vme->start),
2448 prot2str(vme->max_protection), prot2str(vme->protection));
2449 vm_map_lock_upgrade(map);
2450 /*
2451 * This is the really simple case: if a map has more
2452 * max_protection than is allowed, but it's not being
2453 * actually used (that is, the current protection is
2454 * still allowed), we can just wipe it out and do
2455 * nothing more.
2456 */
2457 if ((vme->protection & revokeperms) == 0) {
2458 vme->max_protection -= revokeperms;
2459 } else {
2460 if (revokeperms & VM_PROT_WRITE) {
2461 /*
2462 * In the more complicated case, flush out all
2463 * pending changes to the object then turn it
2464 * copy-on-write.
2465 */
2466 vm_object_reference(object);
2467 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
2468 vm_object_page_clean(object,
2469 OFF_TO_IDX(offset),
2470 OFF_TO_IDX(offset + vme->end - vme->start +
2471 PAGE_MASK),
2472 OBJPC_SYNC);
2473 VOP_UNLOCK(vp, 0, td);
2474 vm_object_deallocate(object);
2475 /*
2476 * Why bother if there's no read permissions
2477 * anymore? For the rest, we need to leave
2478 * the write permissions on for COW, or
2479 * remove them entirely if configured to.
2480 */
2481 if (!mac_mmap_revocation_via_cow) {
2482 vme->max_protection &= ~VM_PROT_WRITE;
2483 vme->protection &= ~VM_PROT_WRITE;
2484 } if ((revokeperms & VM_PROT_READ) == 0)
2485 vme->eflags |= MAP_ENTRY_COW |
2486 MAP_ENTRY_NEEDS_COPY;
2487 }
2488 if (revokeperms & VM_PROT_EXECUTE) {
2489 vme->max_protection &= ~VM_PROT_EXECUTE;
2490 vme->protection &= ~VM_PROT_EXECUTE;
2491 }
2492 if (revokeperms & VM_PROT_READ) {
2493 vme->max_protection = 0;
2494 vme->protection = 0;
2495 }
2496 pmap_protect(map->pmap, vme->start, vme->end,
2497 vme->protection & ~revokeperms);
2498 vm_map_simplify_entry(map, vme);
2499 }
2500 vm_map_lock_downgrade(map);
2501 }
2502 vm_map_unlock_read(map);
2503}
2504
2505/*
2506 * When the subject's label changes, it may require revocation of privilege
2507 * to mapped objects. This can't be done on-the-fly later with a unified
2508 * buffer cache.
2509 */
2510static void
2511mac_relabel_cred(struct ucred *cred, struct label *newlabel)
2512{
2513
2514 MAC_PERFORM(relabel_cred, cred, newlabel);
2515}
2516
2517void
2518mac_relabel_vnode(struct ucred *cred, struct vnode *vp, struct label *newlabel)
2519{
2520
2521 MAC_PERFORM(relabel_vnode, cred, vp, &vp->v_label, newlabel);
2522}
2523
2524void
2525mac_create_ifnet(struct ifnet *ifnet)
2526{
2527
2528 MAC_PERFORM(create_ifnet, ifnet, &ifnet->if_label);
2529}
2530
2531void
2532mac_create_bpfdesc(struct ucred *cred, struct bpf_d *bpf_d)
2533{
2534
2535 MAC_PERFORM(create_bpfdesc, cred, bpf_d, &bpf_d->bd_label);
2536}
2537
2538void
2539mac_create_socket(struct ucred *cred, struct socket *socket)
2540{
2541
2542 MAC_PERFORM(create_socket, cred, socket, &socket->so_label);
2543}
2544
2545void
2546mac_create_pipe(struct ucred *cred, struct pipe *pipe)
2547{
2548
2549 MAC_PERFORM(create_pipe, cred, pipe, pipe->pipe_label);
2550}
2551
2552void
2553mac_create_socket_from_socket(struct socket *oldsocket,
2554 struct socket *newsocket)
2555{
2556
2557 MAC_PERFORM(create_socket_from_socket, oldsocket, &oldsocket->so_label,
2558 newsocket, &newsocket->so_label);
2559}
2560
2561static void
2562mac_relabel_socket(struct ucred *cred, struct socket *socket,
2563 struct label *newlabel)
2564{
2565
2566 MAC_PERFORM(relabel_socket, cred, socket, &socket->so_label, newlabel);
2567}
2568
2569static void
2570mac_relabel_pipe(struct ucred *cred, struct pipe *pipe, struct label *newlabel)
2571{
2572
2573 MAC_PERFORM(relabel_pipe, cred, pipe, pipe->pipe_label, newlabel);
2574}
2575
2576void
2577mac_set_socket_peer_from_mbuf(struct mbuf *mbuf, struct socket *socket)
2578{
2579
2580 MAC_PERFORM(set_socket_peer_from_mbuf, mbuf, &mbuf->m_pkthdr.label,
2581 socket, &socket->so_peerlabel);
2582}
2583
2584void
2585mac_set_socket_peer_from_socket(struct socket *oldsocket,
2586 struct socket *newsocket)
2587{
2588
2589 MAC_PERFORM(set_socket_peer_from_socket, oldsocket,
2590 &oldsocket->so_label, newsocket, &newsocket->so_peerlabel);
2591}
2592
2593void
2594mac_create_datagram_from_ipq(struct ipq *ipq, struct mbuf *datagram)
2595{
2596
2597 MAC_PERFORM(create_datagram_from_ipq, ipq, &ipq->ipq_label,
2598 datagram, &datagram->m_pkthdr.label);
2599}
2600
2601void
2602mac_create_fragment(struct mbuf *datagram, struct mbuf *fragment)
2603{
2604
2605 MAC_PERFORM(create_fragment, datagram, &datagram->m_pkthdr.label,
2606 fragment, &fragment->m_pkthdr.label);
2607}
2608
2609void
2610mac_create_ipq(struct mbuf *fragment, struct ipq *ipq)
2611{
2612
2613 MAC_PERFORM(create_ipq, fragment, &fragment->m_pkthdr.label, ipq,
2614 &ipq->ipq_label);
2615}
2616
2617void
2618mac_create_mbuf_from_mbuf(struct mbuf *oldmbuf, struct mbuf *newmbuf)
2619{
2620
2621 MAC_PERFORM(create_mbuf_from_mbuf, oldmbuf, &oldmbuf->m_pkthdr.label,
2622 newmbuf, &newmbuf->m_pkthdr.label);
2623}
2624
2625void
2626mac_create_mbuf_from_bpfdesc(struct bpf_d *bpf_d, struct mbuf *mbuf)
2627{
2628
2629 MAC_PERFORM(create_mbuf_from_bpfdesc, bpf_d, &bpf_d->bd_label, mbuf,
2630 &mbuf->m_pkthdr.label);
2631}
2632
2633void
2634mac_create_mbuf_linklayer(struct ifnet *ifnet, struct mbuf *mbuf)
2635{
2636
2637 MAC_PERFORM(create_mbuf_linklayer, ifnet, &ifnet->if_label, mbuf,
2638 &mbuf->m_pkthdr.label);
2639}
2640
2641void
2642mac_create_mbuf_from_ifnet(struct ifnet *ifnet, struct mbuf *mbuf)
2643{
2644
2645 MAC_PERFORM(create_mbuf_from_ifnet, ifnet, &ifnet->if_label, mbuf,
2646 &mbuf->m_pkthdr.label);
2647}
2648
2649void
2650mac_create_mbuf_multicast_encap(struct mbuf *oldmbuf, struct ifnet *ifnet,
2651 struct mbuf *newmbuf)
2652{
2653
2654 MAC_PERFORM(create_mbuf_multicast_encap, oldmbuf,
2655 &oldmbuf->m_pkthdr.label, ifnet, &ifnet->if_label, newmbuf,
2656 &newmbuf->m_pkthdr.label);
2657}
2658
2659void
2660mac_create_mbuf_netlayer(struct mbuf *oldmbuf, struct mbuf *newmbuf)
2661{
2662
2663 MAC_PERFORM(create_mbuf_netlayer, oldmbuf, &oldmbuf->m_pkthdr.label,
2664 newmbuf, &newmbuf->m_pkthdr.label);
2665}
2666
2667int
2668mac_fragment_match(struct mbuf *fragment, struct ipq *ipq)
2669{
2670 int result;
2671
2672 result = 1;
2673 MAC_BOOLEAN(fragment_match, &&, fragment, &fragment->m_pkthdr.label,
2674 ipq, &ipq->ipq_label);
2675
2676 return (result);
2677}
2678
2679void
2680mac_update_ipq(struct mbuf *fragment, struct ipq *ipq)
2681{
2682
2683 MAC_PERFORM(update_ipq, fragment, &fragment->m_pkthdr.label, ipq,
2684 &ipq->ipq_label);
2685}
2686
2687void
2688mac_create_mbuf_from_socket(struct socket *socket, struct mbuf *mbuf)
2689{
2690
2691 MAC_PERFORM(create_mbuf_from_socket, socket, &socket->so_label, mbuf,
2692 &mbuf->m_pkthdr.label);
2693}
2694
2695void
2696mac_create_mount(struct ucred *cred, struct mount *mp)
2697{
2698
2699 MAC_PERFORM(create_mount, cred, mp, &mp->mnt_mntlabel,
2700 &mp->mnt_fslabel);
2701}
2702
2703void
2704mac_create_root_mount(struct ucred *cred, struct mount *mp)
2705{
2706
2707 MAC_PERFORM(create_root_mount, cred, mp, &mp->mnt_mntlabel,
2708 &mp->mnt_fslabel);
2709}
2710
2711int
2712mac_check_bpfdesc_receive(struct bpf_d *bpf_d, struct ifnet *ifnet)
2713{
2714 int error;
2715
2716 if (!mac_enforce_network)
2717 return (0);
2718
2719 MAC_CHECK(check_bpfdesc_receive, bpf_d, &bpf_d->bd_label, ifnet,
2720 &ifnet->if_label);
2721
2722 return (error);
2723}
2724
2725static int
2726mac_check_cred_relabel(struct ucred *cred, struct label *newlabel)
2727{
2728 int error;
2729
2730 MAC_CHECK(check_cred_relabel, cred, newlabel);
2731
2732 return (error);
2733}
2734
2735int
2736mac_check_cred_visible(struct ucred *u1, struct ucred *u2)
2737{
2738 int error;
2739
2740 if (!mac_enforce_process)
2741 return (0);
2742
2743 MAC_CHECK(check_cred_visible, u1, u2);
2744
2745 return (error);
2746}
2747
2748int
2749mac_check_ifnet_transmit(struct ifnet *ifnet, struct mbuf *mbuf)
2750{
2751 int error;
2752
2753 if (!mac_enforce_network)
2754 return (0);
2755
2756 KASSERT(mbuf->m_flags & M_PKTHDR, ("packet has no pkthdr"));
2757 if (!(mbuf->m_pkthdr.label.l_flags & MAC_FLAG_INITIALIZED))
2758 printf("%s%d: not initialized\n", ifnet->if_name,
2759 ifnet->if_unit);
2760
2761 MAC_CHECK(check_ifnet_transmit, ifnet, &ifnet->if_label, mbuf,
2762 &mbuf->m_pkthdr.label);
2763
2764 return (error);
2765}
2766
2767int
2768mac_check_mount_stat(struct ucred *cred, struct mount *mount)
2769{
2770 int error;
2771
2772 if (!mac_enforce_fs)
2773 return (0);
2774
2775 MAC_CHECK(check_mount_stat, cred, mount, &mount->mnt_mntlabel);
2776
2777 return (error);
2778}
2779
2780int
2781mac_check_pipe_ioctl(struct ucred *cred, struct pipe *pipe, unsigned long cmd,
2782 void *data)
2783{
2784 int error;
2785
2786 PIPE_LOCK_ASSERT(pipe, MA_OWNED);
2787
2788 if (!mac_enforce_pipe)
2789 return (0);
2790
2791 MAC_CHECK(check_pipe_ioctl, cred, pipe, pipe->pipe_label, cmd, data);
2792
2793 return (error);
2794}
2795
2796int
2797mac_check_pipe_poll(struct ucred *cred, struct pipe *pipe)
2798{
2799 int error;
2800
2801 PIPE_LOCK_ASSERT(pipe, MA_OWNED);
2802
2803 if (!mac_enforce_pipe)
2804 return (0);
2805
2806 MAC_CHECK(check_pipe_poll, cred, pipe, pipe->pipe_label);
2807
2808 return (error);
2809}
2810
2811int
2812mac_check_pipe_read(struct ucred *cred, struct pipe *pipe)
2813{
2814 int error;
2815
2816 PIPE_LOCK_ASSERT(pipe, MA_OWNED);
2817
2818 if (!mac_enforce_pipe)
2819 return (0);
2820
2821 MAC_CHECK(check_pipe_read, cred, pipe, pipe->pipe_label);
2822
2823 return (error);
2824}
2825
2826static int
2827mac_check_pipe_relabel(struct ucred *cred, struct pipe *pipe,
2828 struct label *newlabel)
2829{
2830 int error;
2831
2832 PIPE_LOCK_ASSERT(pipe, MA_OWNED);
2833
2834 if (!mac_enforce_pipe)
2835 return (0);
2836
2837 MAC_CHECK(check_pipe_relabel, cred, pipe, pipe->pipe_label, newlabel);
2838
2839 return (error);
2840}
2841
2842int
2843mac_check_pipe_stat(struct ucred *cred, struct pipe *pipe)
2844{
2845 int error;
2846
2847 PIPE_LOCK_ASSERT(pipe, MA_OWNED);
2848
2849 if (!mac_enforce_pipe)
2850 return (0);
2851
2852 MAC_CHECK(check_pipe_stat, cred, pipe, pipe->pipe_label);
2853
2854 return (error);
2855}
2856
2857int
2858mac_check_pipe_write(struct ucred *cred, struct pipe *pipe)
2859{
2860 int error;
2861
2862 PIPE_LOCK_ASSERT(pipe, MA_OWNED);
2863
2864 if (!mac_enforce_pipe)
2865 return (0);
2866
2867 MAC_CHECK(check_pipe_write, cred, pipe, pipe->pipe_label);
2868
2869 return (error);
2870}
2871
2872int
2873mac_check_proc_debug(struct ucred *cred, struct proc *proc)
2874{
2875 int error;
2876
2877 PROC_LOCK_ASSERT(proc, MA_OWNED);
2878
2879 if (!mac_enforce_process)
2880 return (0);
2881
2882 MAC_CHECK(check_proc_debug, cred, proc);
2883
2884 return (error);
2885}
2886
2887int
2888mac_check_proc_sched(struct ucred *cred, struct proc *proc)
2889{
2890 int error;
2891
2892 PROC_LOCK_ASSERT(proc, MA_OWNED);
2893
2894 if (!mac_enforce_process)
2895 return (0);
2896
2897 MAC_CHECK(check_proc_sched, cred, proc);
2898
2899 return (error);
2900}
2901
2902int
2903mac_check_proc_signal(struct ucred *cred, struct proc *proc, int signum)
2904{
2905 int error;
2906
2907 PROC_LOCK_ASSERT(proc, MA_OWNED);
2908
2909 if (!mac_enforce_process)
2910 return (0);
2911
2912 MAC_CHECK(check_proc_signal, cred, proc, signum);
2913
2914 return (error);
2915}
2916
2917int
2918mac_check_socket_bind(struct ucred *ucred, struct socket *socket,
2919 struct sockaddr *sockaddr)
2920{
2921 int error;
2922
2923 if (!mac_enforce_socket)
2924 return (0);
2925
2926 MAC_CHECK(check_socket_bind, ucred, socket, &socket->so_label,
2927 sockaddr);
2928
2929 return (error);
2930}
2931
2932int
2933mac_check_socket_connect(struct ucred *cred, struct socket *socket,
2934 struct sockaddr *sockaddr)
2935{
2936 int error;
2937
2938 if (!mac_enforce_socket)
2939 return (0);
2940
2941 MAC_CHECK(check_socket_connect, cred, socket, &socket->so_label,
2942 sockaddr);
2943
2944 return (error);
2945}
2946
2947int
2948mac_check_socket_deliver(struct socket *socket, struct mbuf *mbuf)
2949{
2950 int error;
2951
2952 if (!mac_enforce_socket)
2953 return (0);
2954
2955 MAC_CHECK(check_socket_deliver, socket, &socket->so_label, mbuf,
2956 &mbuf->m_pkthdr.label);
2957
2958 return (error);
2959}
2960
2961int
2962mac_check_socket_listen(struct ucred *cred, struct socket *socket)
2963{
2964 int error;
2965
2966 if (!mac_enforce_socket)
2967 return (0);
2968
2969 MAC_CHECK(check_socket_listen, cred, socket, &socket->so_label);
2970 return (error);
2971}
2972
2973int
2974mac_check_socket_receive(struct ucred *cred, struct socket *so)
2975{
2976 int error;
2977
2978 if (!mac_enforce_socket)
2979 return (0);
2980
2981 MAC_CHECK(check_socket_receive, cred, so, &so->so_label);
2982
2983 return (error);
2984}
2985
2986static int
2987mac_check_socket_relabel(struct ucred *cred, struct socket *socket,
2988 struct label *newlabel)
2989{
2990 int error;
2991
2992 MAC_CHECK(check_socket_relabel, cred, socket, &socket->so_label,
2993 newlabel);
2994
2995 return (error);
2996}
2997
2998int
2999mac_check_socket_send(struct ucred *cred, struct socket *so)
3000{
3001 int error;
3002
3003 if (!mac_enforce_socket)
3004 return (0);
3005
3006 MAC_CHECK(check_socket_send, cred, so, &so->so_label);
3007
3008 return (error);
3009}
3010
3011int
3012mac_check_socket_visible(struct ucred *cred, struct socket *socket)
3013{
3014 int error;
3015
3016 if (!mac_enforce_socket)
3017 return (0);
3018
3019 MAC_CHECK(check_socket_visible, cred, socket, &socket->so_label);
3020
3021 return (error);
3022}
3023
3024int
3025mac_ioctl_ifnet_get(struct ucred *cred, struct ifreq *ifr,
3026 struct ifnet *ifnet)
3027{
3028 struct mac label;
3029 int error;
3030
3031 error = mac_externalize(&ifnet->if_label, &label);
3032 if (error)
3033 return (error);
3034
3035 return (copyout(&label, ifr->ifr_ifru.ifru_data, sizeof(label)));
3036}
3037
3038int
3039mac_ioctl_ifnet_set(struct ucred *cred, struct ifreq *ifr,
3040 struct ifnet *ifnet)
3041{
3042 struct mac newlabel;
3043 struct label intlabel;
3044 int error;
3045
3046 error = copyin(ifr->ifr_ifru.ifru_data, &newlabel, sizeof(newlabel));
3047 if (error)
3048 return (error);
3049
3050 error = mac_internalize(&intlabel, &newlabel);
3051 if (error)
3052 return (error);
3053
3054 /*
3055 * XXX: Note that this is a redundant privilege check, since
3056 * policies impose this check themselves if required by the
3057 * policy. Eventually, this should go away.
3058 */
3059 error = suser_cred(cred, 0);
3060 if (error)
3061 goto out;
3062
3063 MAC_CHECK(check_ifnet_relabel, cred, ifnet, &ifnet->if_label,
3064 &intlabel);
3065 if (error)
3066 goto out;
3067
3068 MAC_PERFORM(relabel_ifnet, cred, ifnet, &ifnet->if_label, &intlabel);
3069
3070out:
3071 mac_destroy_temp(&intlabel);
3072 return (error);
3073}
3074
3075void
3076mac_create_devfs_vnode(struct devfs_dirent *de, struct vnode *vp)
3077{
3078
3079 MAC_PERFORM(create_devfs_vnode, de, &de->de_label, vp, &vp->v_label);
3080}
3081
3082void
3083mac_create_devfs_device(dev_t dev, struct devfs_dirent *de)
3084{
3085
3086 MAC_PERFORM(create_devfs_device, dev, de, &de->de_label);
3087}
3088
3089void
3090mac_create_devfs_symlink(struct ucred *cred, struct devfs_dirent *dd,
3091 struct devfs_dirent *de)
3092{
3093
3094 MAC_PERFORM(create_devfs_symlink, cred, dd, &dd->de_label, de,
3095 &de->de_label);
3096}
3097
3098static int
3099mac_stdcreatevnode_ea(struct vnode *vp)
3100{
3101 int error;
3102
3103 MAC_CHECK(stdcreatevnode_ea, vp, &vp->v_label);
3104
3105 return (error);
3106}
3107
3108void
3109mac_create_devfs_directory(char *dirname, int dirnamelen,
3110 struct devfs_dirent *de)
3111{
3112
3113 MAC_PERFORM(create_devfs_directory, dirname, dirnamelen, de,
3114 &de->de_label);
3115}
3116
3117/*
3118 * When a new vnode is created, this call will initialize its label.
3119 */
3120void
3121mac_create_vnode(struct ucred *cred, struct vnode *parent,
3122 struct vnode *child)
3123{
3124 int error;
3125
3126 ASSERT_VOP_LOCKED(parent, "mac_create_vnode");
3127 ASSERT_VOP_LOCKED(child, "mac_create_vnode");
3128
3129 error = vn_refreshlabel(parent, cred);
3130 if (error) {
3131 printf("mac_create_vnode: vn_refreshlabel returned %d\n",
3132 error);
3133 printf("mac_create_vnode: using old vnode label\n");
3134 }
3135
3136 MAC_PERFORM(create_vnode, cred, parent, &parent->v_label, child,
3137 &child->v_label);
3138}
3139
3140int
3141mac_setsockopt_label_set(struct ucred *cred, struct socket *so,
3142 struct mac *extmac)
3143{
3144 struct label intlabel;
3145 int error;
3146
3147 error = mac_internalize(&intlabel, extmac);
3148 if (error)
3149 return (error);
3150
3151 mac_check_socket_relabel(cred, so, &intlabel);
3152 if (error) {
3153 mac_destroy_temp(&intlabel);
3154 return (error);
3155 }
3156
3157 mac_relabel_socket(cred, so, &intlabel);
3158
3159 mac_destroy_temp(&intlabel);
3160 return (0);
3161}
3162
3163int
3164mac_pipe_label_set(struct ucred *cred, struct pipe *pipe, struct label *label)
3165{
3166 int error;
3167
3168 PIPE_LOCK_ASSERT(pipe, MA_OWNED);
3169
3170 error = mac_check_pipe_relabel(cred, pipe, label);
3171 if (error)
3172 return (error);
3173
3174 mac_relabel_pipe(cred, pipe, label);
3175
3176 return (0);
3177}
3178
3179int
3180mac_getsockopt_label_get(struct ucred *cred, struct socket *so,
3181 struct mac *extmac)
3182{
3183
3184 return (mac_externalize(&so->so_label, extmac));
3185}
3186
3187int
3188mac_getsockopt_peerlabel_get(struct ucred *cred, struct socket *so,
3189 struct mac *extmac)
3190{
3191
3192 return (mac_externalize(&so->so_peerlabel, extmac));
3193}
3194
3195/*
3196 * Implementation of VOP_SETLABEL() that relies on extended attributes
3197 * to store label data. Can be referenced by filesystems supporting
3198 * extended attributes.
3199 */
3200int
3201vop_stdsetlabel_ea(struct vop_setlabel_args *ap)
3202{
3203 struct vnode *vp = ap->a_vp;
3204 struct label *intlabel = ap->a_label;
3205 struct mac extmac;
3206 int error;
3207
3208 ASSERT_VOP_LOCKED(vp, "vop_stdsetlabel_ea");
3209
3210 /*
3211 * XXX: Eventually call out to EA check/set calls here.
3212 * Be particularly careful to avoid race conditions,
3213 * consistency problems, and stability problems when
3214 * dealing with multiple EAs. In particular, we require
3215 * the ability to write multiple EAs on the same file in
3216 * a single transaction, which the current EA interface
3217 * does not provide.
3218 */
3219
3220 error = mac_externalize(intlabel, &extmac);
3221 if (error)
3222 return (error);
3223
3224 error = vn_extattr_set(vp, IO_NODELOCKED,
3225 FREEBSD_MAC_EXTATTR_NAMESPACE, FREEBSD_MAC_EXTATTR_NAME,
3226 sizeof(extmac), (char *)&extmac, curthread);
3227 if (error)
3228 return (error);
3229
3230 mac_relabel_vnode(ap->a_cred, vp, intlabel);
3231
3232 vp->v_vflag |= VV_CACHEDLABEL;
3233
3234 return (0);
3235}
3236
3237static int
3238vn_setlabel(struct vnode *vp, struct label *intlabel, struct ucred *cred)
3239{
3240 int error;
3241
3242 if (vp->v_mount == NULL) {
3243 /* printf("vn_setlabel: null v_mount\n"); */
3244 if (vp->v_type != VNON)
3245 printf("vn_setlabel: null v_mount with non-VNON\n");
3246 return (EBADF);
3247 }
3248
3249 if ((vp->v_mount->mnt_flag & MNT_MULTILABEL) == 0)
3250 return (EOPNOTSUPP);
3251
3252 /*
3253 * Multi-phase commit. First check the policies to confirm the
3254 * change is OK. Then commit via the filesystem. Finally,
3255 * update the actual vnode label. Question: maybe the filesystem
3256 * should update the vnode at the end as part of VOP_SETLABEL()?
3257 */
3258 error = mac_check_vnode_relabel(cred, vp, intlabel);
3259 if (error)
3260 return (error);
3261
3262 /*
3263 * VADMIN provides the opportunity for the filesystem to make
3264 * decisions about who is and is not able to modify labels
3265 * and protections on files. This might not be right. We can't
3266 * assume VOP_SETLABEL() will do it, because we might implement
3267 * that as part of vop_stdsetlabel_ea().
3268 */
3269 error = VOP_ACCESS(vp, VADMIN, cred, curthread);
3270 if (error)
3271 return (error);
3272
3273 error = VOP_SETLABEL(vp, intlabel, cred, curthread);
3274 if (error)
3275 return (error);
3276
3277 return (0);
3278}
3279
3280/*
3281 * MPSAFE
3282 */
3283int
3284__mac_get_proc(struct thread *td, struct __mac_get_proc_args *uap)
3285{
3286 struct mac extmac;
3287 int error;
3288
3289 error = mac_externalize(&td->td_ucred->cr_label, &extmac);
3290 if (error == 0)
3291 error = copyout(&extmac, SCARG(uap, mac_p), sizeof(extmac));
3292
3293 return (error);
3294}
3295
3296/*
3297 * MPSAFE
3298 */
3299int
3300__mac_set_proc(struct thread *td, struct __mac_set_proc_args *uap)
3301{
3302 struct ucred *newcred, *oldcred;
3303 struct proc *p;
3304 struct mac extmac;
3305 struct label intlabel;
3306 int error;
3307
3308 error = copyin(SCARG(uap, mac_p), &extmac, sizeof(extmac));
3309 if (error)
3310 return (error);
3311
3312 error = mac_internalize(&intlabel, &extmac);
3313 if (error)
3314 return (error);
3315
3316 newcred = crget();
3317
3318 p = td->td_proc;
3319 PROC_LOCK(p);
3320 oldcred = p->p_ucred;
3321
3322 error = mac_check_cred_relabel(oldcred, &intlabel);
3323 if (error) {
3324 PROC_UNLOCK(p);
3325 mac_destroy_temp(&intlabel);
3326 crfree(newcred);
3327 return (error);
3328 }
3329
3330 setsugid(p);
3331 crcopy(newcred, oldcred);
3332 mac_relabel_cred(newcred, &intlabel);
3333 p->p_ucred = newcred;
3334
3335 /*
3336 * Grab additional reference for use while revoking mmaps, prior
3337 * to releasing the proc lock and sharing the cred.
3338 */
3339 crhold(newcred);
3340 PROC_UNLOCK(p);
3341
3342 mtx_lock(&Giant);
3343 mac_cred_mmapped_drop_perms(td, newcred);
3344 mtx_unlock(&Giant);
3345
3346 crfree(newcred); /* Free revocation reference. */
3347 crfree(oldcred);
3348 mac_destroy_temp(&intlabel);
3349 return (0);
3350}
3351
3352/*
3353 * MPSAFE
3354 */
3355int
3356__mac_get_fd(struct thread *td, struct __mac_get_fd_args *uap)
3357{
3358 struct file *fp;
3359 struct mac extmac;
3360 struct vnode *vp;
3361 struct pipe *pipe;
3362 int error;
3363
3364 mtx_lock(&Giant);
3365
3366 error = fget(td, SCARG(uap, fd), &fp);
3367 if (error)
3368 goto out;
3369
3370 switch (fp->f_type) {
3371 case DTYPE_FIFO:
3372 case DTYPE_VNODE:
3373 vp = (struct vnode *)fp->f_data;
3374
3375 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
3376 error = vn_refreshlabel(vp, td->td_ucred);
3377 if (error == 0)
3378 error = mac_externalize(&vp->v_label, &extmac);
3379 VOP_UNLOCK(vp, 0, td);
3380 break;
3381 case DTYPE_PIPE:
3382 pipe = (struct pipe *)fp->f_data;
3383 error = mac_externalize(pipe->pipe_label, &extmac);
3384 break;
3385 default:
3386 error = EINVAL;
3387 }
3388
3389 if (error == 0)
3390 error = copyout(&extmac, SCARG(uap, mac_p), sizeof(extmac));
3391
3392 fdrop(fp, td);
3393
3394out:
3395 mtx_unlock(&Giant);
3396 return (error);
3397}
3398
3399/*
3400 * MPSAFE
3401 */
3402int
3403__mac_get_file(struct thread *td, struct __mac_get_file_args *uap)
3404{
3405 struct nameidata nd;
3406 struct mac extmac;
3407 int error;
3408
3409 mtx_lock(&Giant);
3410 NDINIT(&nd, LOOKUP, LOCKLEAF | FOLLOW, UIO_USERSPACE,
3411 SCARG(uap, path_p), td);
3412 error = namei(&nd);
3413 if (error)
3414 goto out;
3415
3416 error = vn_refreshlabel(nd.ni_vp, td->td_ucred);
3417 if (error == 0)
3418 error = mac_externalize(&nd.ni_vp->v_label, &extmac);
3419 NDFREE(&nd, 0);
3420 if (error)
3421 goto out;
3422
3423 error = copyout(&extmac, SCARG(uap, mac_p), sizeof(extmac));
3424
3425out:
3426 mtx_unlock(&Giant);
3427 return (error);
3428}
3429
3430/*
3431 * MPSAFE
3432 */
3433int
3434__mac_set_fd(struct thread *td, struct __mac_set_fd_args *uap)
3435{
3436 struct file *fp;
3437 struct mac extmac;
3438 struct label intlabel;
3439 struct mount *mp;
3440 struct vnode *vp;
3441 struct pipe *pipe;
3442 int error;
3443
3444 mtx_lock(&Giant);
3445 error = fget(td, SCARG(uap, fd), &fp);
3446 if (error)
3447 goto out1;
3448
3449 error = copyin(SCARG(uap, mac_p), &extmac, sizeof(extmac));
3450 if (error)
3451 goto out2;
3452
3453 error = mac_internalize(&intlabel, &extmac);
3454 if (error)
3455 goto out2;
3456
3457 switch (fp->f_type) {
3458 case DTYPE_FIFO:
3459 case DTYPE_VNODE:
3460 vp = (struct vnode *)fp->f_data;
3461 error = vn_start_write(vp, &mp, V_WAIT | PCATCH);
3462 if (error != 0)
3463 break;
3464
3465 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
3466 error = vn_setlabel(vp, &intlabel, td->td_ucred);
3467 VOP_UNLOCK(vp, 0, td);
3468 vn_finished_write(mp);
3469 mac_destroy_temp(&intlabel);
3470 break;
3471 case DTYPE_PIPE:
3472 pipe = (struct pipe *)fp->f_data;
3473 PIPE_LOCK(pipe);
3474 error = mac_pipe_label_set(td->td_ucred, pipe, &intlabel);
3475 PIPE_UNLOCK(pipe);
3476 break;
3477 default:
3478 error = EINVAL;
3479 }
3480
3481out2:
3482 fdrop(fp, td);
3483out1:
3484 mtx_unlock(&Giant);
3485 return (error);
3486}
3487
3488/*
3489 * MPSAFE
3490 */
3491int
3492__mac_set_file(struct thread *td, struct __mac_set_file_args *uap)
3493{
3494 struct nameidata nd;
3495 struct mac extmac;
3496 struct label intlabel;
3497 struct mount *mp;
3498 int error;
3499
3500 mtx_lock(&Giant);
3501
3502 error = copyin(SCARG(uap, mac_p), &extmac, sizeof(extmac));
3503 if (error)
3504 goto out;
3505
3506 error = mac_internalize(&intlabel, &extmac);
3507 if (error)
3508 goto out;
3509
3510 NDINIT(&nd, LOOKUP, LOCKLEAF | FOLLOW, UIO_USERSPACE,
3511 SCARG(uap, path_p), td);
3512 error = namei(&nd);
3513 if (error)
3514 goto out2;
3515 error = vn_start_write(nd.ni_vp, &mp, V_WAIT | PCATCH);
3516 if (error)
3517 goto out2;
3518
3519 error = vn_setlabel(nd.ni_vp, &intlabel, td->td_ucred);
3520
3521 vn_finished_write(mp);
3522out2:
3523 mac_destroy_temp(&intlabel);
3524 NDFREE(&nd, 0);
3525out:
3526 mtx_unlock(&Giant);
3527 return (error);
3528}
3529
3530int
3531mac_syscall(struct thread *td, struct mac_syscall_args *uap)
3532{
3533 struct mac_policy_conf *mpc;
3534 char target[MAC_MAX_POLICY_NAME];
3535 int error;
3536
3537 error = copyinstr(SCARG(uap, policy), target, sizeof(target), NULL);
3538 if (error)
3539 return (error);
3540
3541 error = ENOSYS;
3542 MAC_POLICY_LIST_BUSY();
3543 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) {
3544 if (strcmp(mpc->mpc_name, target) == 0 &&
3545 mpc->mpc_ops->mpo_syscall != NULL) {
3546 error = mpc->mpc_ops->mpo_syscall(td,
3547 SCARG(uap, call), SCARG(uap, arg));
3548 goto out;
3549 }
3550 }
3551
3552out:
3553 MAC_POLICY_LIST_UNBUSY();
3554 return (error);
3555}
3556
3557SYSINIT(mac, SI_SUB_MAC, SI_ORDER_FIRST, mac_init, NULL);
3558SYSINIT(mac_late, SI_SUB_MAC_LATE, SI_ORDER_FIRST, mac_late_init, NULL);
3559
3560#else /* !MAC */
3561
3562int
3563__mac_get_proc(struct thread *td, struct __mac_get_proc_args *uap)
3564{
3565
3566 return (ENOSYS);
3567}
3568
3569int
3570__mac_set_proc(struct thread *td, struct __mac_set_proc_args *uap)
3571{
3572
3573 return (ENOSYS);
3574}
3575
3576int
3577__mac_get_fd(struct thread *td, struct __mac_get_fd_args *uap)
3578{
3579
3580 return (ENOSYS);
3581}
3582
3583int
3584__mac_get_file(struct thread *td, struct __mac_get_file_args *uap)
3585{
3586
3587 return (ENOSYS);
3588}
3589
3590int
3591__mac_set_fd(struct thread *td, struct __mac_set_fd_args *uap)
3592{
3593
3594 return (ENOSYS);
3595}
3596
3597int
3598__mac_set_file(struct thread *td, struct __mac_set_file_args *uap)
3599{
3600
3601 return (ENOSYS);
3602}
3603
3604int
3605mac_syscall(struct thread *td, struct mac_syscall_args *uap)
3606{
3607
3608 return (ENOSYS);
3609}
3610
3611#endif /* !MAC */
| 106static unsigned int mac_max_policies = MAC_MAX_POLICIES;
107static unsigned int mac_policy_offsets_free = (1 << MAC_MAX_POLICIES) - 1;
108SYSCTL_UINT(_security_mac, OID_AUTO, max_policies, CTLFLAG_RD,
109 &mac_max_policies, 0, "");
110
111static int mac_late = 0;
112
113static int mac_enforce_fs = 1;
114SYSCTL_INT(_security_mac, OID_AUTO, enforce_fs, CTLFLAG_RW,
115 &mac_enforce_fs, 0, "Enforce MAC policy on file system objects");
116TUNABLE_INT("security.mac.enforce_fs", &mac_enforce_fs);
117
118static int mac_enforce_network = 1;
119SYSCTL_INT(_security_mac, OID_AUTO, enforce_network, CTLFLAG_RW,
120 &mac_enforce_network, 0, "Enforce MAC policy on network packets");
121TUNABLE_INT("security.mac.enforce_network", &mac_enforce_network);
122
123static int mac_enforce_pipe = 1;
124SYSCTL_INT(_security_mac, OID_AUTO, enforce_pipe, CTLFLAG_RW,
125 &mac_enforce_pipe, 0, "Enforce MAC policy on pipe operations");
126TUNABLE_INT("security.mac.enforce_pipe", &mac_enforce_pipe);
127
128static int mac_enforce_process = 1;
129SYSCTL_INT(_security_mac, OID_AUTO, enforce_process, CTLFLAG_RW,
130 &mac_enforce_process, 0, "Enforce MAC policy on inter-process operations");
131TUNABLE_INT("security.mac.enforce_process", &mac_enforce_process);
132
133static int mac_enforce_socket = 1;
134SYSCTL_INT(_security_mac, OID_AUTO, enforce_socket, CTLFLAG_RW,
135 &mac_enforce_socket, 0, "Enforce MAC policy on socket operations");
136TUNABLE_INT("security.mac.enforce_socket", &mac_enforce_socket);
137
138static int mac_enforce_vm = 1;
139SYSCTL_INT(_security_mac, OID_AUTO, enforce_vm, CTLFLAG_RW,
140 &mac_enforce_vm, 0, "Enforce MAC policy on vm operations");
141TUNABLE_INT("security.mac.enforce_vm", &mac_enforce_vm);
142
143static int mac_label_size = sizeof(struct mac);
144SYSCTL_INT(_security_mac, OID_AUTO, label_size, CTLFLAG_RD,
145 &mac_label_size, 0, "Pre-compiled MAC label size");
146
147static int mac_cache_fslabel_in_vnode = 1;
148SYSCTL_INT(_security_mac, OID_AUTO, cache_fslabel_in_vnode, CTLFLAG_RW,
149 &mac_cache_fslabel_in_vnode, 0, "Cache mount fslabel in vnode");
150TUNABLE_INT("security.mac.cache_fslabel_in_vnode",
151 &mac_cache_fslabel_in_vnode);
152
153static int mac_vnode_label_cache_hits = 0;
154SYSCTL_INT(_security_mac, OID_AUTO, vnode_label_cache_hits, CTLFLAG_RD,
155 &mac_vnode_label_cache_hits, 0, "Cache hits on vnode labels");
156static int mac_vnode_label_cache_misses = 0;
157SYSCTL_INT(_security_mac, OID_AUTO, vnode_label_cache_misses, CTLFLAG_RD,
158 &mac_vnode_label_cache_misses, 0, "Cache misses on vnode labels");
159
160static int mac_mmap_revocation = 1;
161SYSCTL_INT(_security_mac, OID_AUTO, mmap_revocation, CTLFLAG_RW,
162 &mac_mmap_revocation, 0, "Revoke mmap access to files on subject "
163 "relabel");
164static int mac_mmap_revocation_via_cow = 0;
165SYSCTL_INT(_security_mac, OID_AUTO, mmap_revocation_via_cow, CTLFLAG_RW,
166 &mac_mmap_revocation_via_cow, 0, "Revoke mmap access to files via "
167 "copy-on-write semantics, or by removing all write access");
168
169#ifdef MAC_DEBUG
170SYSCTL_NODE(_security_mac, OID_AUTO, debug, CTLFLAG_RW, 0,
171 "TrustedBSD MAC debug info");
172
173static int mac_debug_label_fallback = 0;
174SYSCTL_INT(_security_mac_debug, OID_AUTO, label_fallback, CTLFLAG_RW,
175 &mac_debug_label_fallback, 0, "Filesystems should fall back to fs label"
176 "when label is corrupted.");
177TUNABLE_INT("security.mac.debug_label_fallback",
178 &mac_debug_label_fallback);
179
180SYSCTL_NODE(_security_mac_debug, OID_AUTO, counters, CTLFLAG_RW, 0,
181 "TrustedBSD MAC object counters");
182
183static unsigned int nmacmbufs, nmaccreds, nmacifnets, nmacbpfdescs,
184 nmacsockets, nmacmounts, nmactemp, nmacvnodes, nmacdevfsdirents,
185 nmacipqs, nmacpipes;
186
187SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, mbufs, CTLFLAG_RD,
188 &nmacmbufs, 0, "number of mbufs in use");
189SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, creds, CTLFLAG_RD,
190 &nmaccreds, 0, "number of ucreds in use");
191SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, ifnets, CTLFLAG_RD,
192 &nmacifnets, 0, "number of ifnets in use");
193SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, ipqs, CTLFLAG_RD,
194 &nmacipqs, 0, "number of ipqs in use");
195SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, bpfdescs, CTLFLAG_RD,
196 &nmacbpfdescs, 0, "number of bpfdescs in use");
197SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, sockets, CTLFLAG_RD,
198 &nmacsockets, 0, "number of sockets in use");
199SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, pipes, CTLFLAG_RD,
200 &nmacpipes, 0, "number of pipes in use");
201SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, mounts, CTLFLAG_RD,
202 &nmacmounts, 0, "number of mounts in use");
203SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, temp, CTLFLAG_RD,
204 &nmactemp, 0, "number of temporary labels in use");
205SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, vnodes, CTLFLAG_RD,
206 &nmacvnodes, 0, "number of vnodes in use");
207SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, devfsdirents, CTLFLAG_RD,
208 &nmacdevfsdirents, 0, "number of devfs dirents inuse");
209#endif
210
211static int error_select(int error1, int error2);
212static int mac_externalize(struct label *label, struct mac *mac);
213static int mac_policy_register(struct mac_policy_conf *mpc);
214static int mac_policy_unregister(struct mac_policy_conf *mpc);
215
216static int mac_stdcreatevnode_ea(struct vnode *vp);
217static void mac_check_vnode_mmap_downgrade(struct ucred *cred,
218 struct vnode *vp, int *prot);
219static void mac_cred_mmapped_drop_perms_recurse(struct thread *td,
220 struct ucred *cred, struct vm_map *map);
221
222static void mac_destroy_socket_label(struct label *label);
223
224MALLOC_DEFINE(M_MACOPVEC, "macopvec", "MAC policy operation vector");
225MALLOC_DEFINE(M_MACPIPELABEL, "macpipelabel", "MAC labels for pipes");
226
227/*
228 * mac_policy_list_lock protects the consistency of 'mac_policy_list',
229 * the linked list of attached policy modules. Read-only consumers of
230 * the list must acquire a shared lock for the duration of their use;
231 * writers must acquire an exclusive lock. Note that for compound
232 * operations, locks should be held for the entire compound operation,
233 * and that this is not yet done for relabel requests.
234 */
235static struct mtx mac_policy_list_lock;
236static LIST_HEAD(, mac_policy_conf) mac_policy_list;
237static int mac_policy_list_busy;
238#define MAC_POLICY_LIST_LOCKINIT() mtx_init(&mac_policy_list_lock, \
239 "mac_policy_list_lock", NULL, MTX_DEF);
240#define MAC_POLICY_LIST_LOCK() mtx_lock(&mac_policy_list_lock);
241#define MAC_POLICY_LIST_UNLOCK() mtx_unlock(&mac_policy_list_lock);
242
243#define MAC_POLICY_LIST_BUSY() do { \
244 MAC_POLICY_LIST_LOCK(); \
245 mac_policy_list_busy++; \
246 MAC_POLICY_LIST_UNLOCK(); \
247} while (0)
248
249#define MAC_POLICY_LIST_UNBUSY() do { \
250 MAC_POLICY_LIST_LOCK(); \
251 mac_policy_list_busy--; \
252 if (mac_policy_list_busy < 0) \
253 panic("Extra mac_policy_list_busy--"); \
254 MAC_POLICY_LIST_UNLOCK(); \
255} while (0)
256
257/*
258 * MAC_CHECK performs the designated check by walking the policy
259 * module list and checking with each as to how it feels about the
260 * request. Note that it returns its value via 'error' in the scope
261 * of the caller.
262 */
263#define MAC_CHECK(check, args...) do { \
264 struct mac_policy_conf *mpc; \
265 \
266 error = 0; \
267 MAC_POLICY_LIST_BUSY(); \
268 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \
269 if (mpc->mpc_ops->mpo_ ## check != NULL) \
270 error = error_select( \
271 mpc->mpc_ops->mpo_ ## check (args), \
272 error); \
273 } \
274 MAC_POLICY_LIST_UNBUSY(); \
275} while (0)
276
277/*
278 * MAC_BOOLEAN performs the designated boolean composition by walking
279 * the module list, invoking each instance of the operation, and
280 * combining the results using the passed C operator. Note that it
281 * returns its value via 'result' in the scope of the caller, which
282 * should be initialized by the caller in a meaningful way to get
283 * a meaningful result.
284 */
285#define MAC_BOOLEAN(operation, composition, args...) do { \
286 struct mac_policy_conf *mpc; \
287 \
288 MAC_POLICY_LIST_BUSY(); \
289 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \
290 if (mpc->mpc_ops->mpo_ ## operation != NULL) \
291 result = result composition \
292 mpc->mpc_ops->mpo_ ## operation (args); \
293 } \
294 MAC_POLICY_LIST_UNBUSY(); \
295} while (0)
296
297/*
298 * MAC_PERFORM performs the designated operation by walking the policy
299 * module list and invoking that operation for each policy.
300 */
301#define MAC_PERFORM(operation, args...) do { \
302 struct mac_policy_conf *mpc; \
303 \
304 MAC_POLICY_LIST_BUSY(); \
305 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \
306 if (mpc->mpc_ops->mpo_ ## operation != NULL) \
307 mpc->mpc_ops->mpo_ ## operation (args); \
308 } \
309 MAC_POLICY_LIST_UNBUSY(); \
310} while (0)
311
312/*
313 * Initialize the MAC subsystem, including appropriate SMP locks.
314 */
315static void
316mac_init(void)
317{
318
319 LIST_INIT(&mac_policy_list);
320 MAC_POLICY_LIST_LOCKINIT();
321}
322
323/*
324 * For the purposes of modules that want to know if they were loaded
325 * "early", set the mac_late flag once we've processed modules either
326 * linked into the kernel, or loaded before the kernel startup.
327 */
328static void
329mac_late_init(void)
330{
331
332 mac_late = 1;
333}
334
335/*
336 * Allow MAC policy modules to register during boot, etc.
337 */
338int
339mac_policy_modevent(module_t mod, int type, void *data)
340{
341 struct mac_policy_conf *mpc;
342 int error;
343
344 error = 0;
345 mpc = (struct mac_policy_conf *) data;
346
347 switch (type) {
348 case MOD_LOAD:
349 if (mpc->mpc_loadtime_flags & MPC_LOADTIME_FLAG_NOTLATE &&
350 mac_late) {
351 printf("mac_policy_modevent: can't load %s policy "
352 "after booting\n", mpc->mpc_name);
353 error = EBUSY;
354 break;
355 }
356 error = mac_policy_register(mpc);
357 break;
358 case MOD_UNLOAD:
359 /* Don't unregister the module if it was never registered. */
360 if ((mpc->mpc_runtime_flags & MPC_RUNTIME_FLAG_REGISTERED)
361 != 0)
362 error = mac_policy_unregister(mpc);
363 else
364 error = 0;
365 break;
366 default:
367 break;
368 }
369
370 return (error);
371}
372
373static int
374mac_policy_register(struct mac_policy_conf *mpc)
375{
376 struct mac_policy_conf *tmpc;
377 struct mac_policy_op_entry *mpe;
378 int slot;
379
380 MALLOC(mpc->mpc_ops, struct mac_policy_ops *, sizeof(*mpc->mpc_ops),
381 M_MACOPVEC, M_WAITOK | M_ZERO);
382 for (mpe = mpc->mpc_entries; mpe->mpe_constant != MAC_OP_LAST; mpe++) {
383 switch (mpe->mpe_constant) {
384 case MAC_OP_LAST:
385 /*
386 * Doesn't actually happen, but this allows checking
387 * that all enumerated values are handled.
388 */
389 break;
390 case MAC_DESTROY:
391 mpc->mpc_ops->mpo_destroy =
392 mpe->mpe_function;
393 break;
394 case MAC_INIT:
395 mpc->mpc_ops->mpo_init =
396 mpe->mpe_function;
397 break;
398 case MAC_SYSCALL:
399 mpc->mpc_ops->mpo_syscall =
400 mpe->mpe_function;
401 break;
402 case MAC_INIT_BPFDESC_LABEL:
403 mpc->mpc_ops->mpo_init_bpfdesc_label =
404 mpe->mpe_function;
405 break;
406 case MAC_INIT_CRED_LABEL:
407 mpc->mpc_ops->mpo_init_cred_label =
408 mpe->mpe_function;
409 break;
410 case MAC_INIT_DEVFSDIRENT_LABEL:
411 mpc->mpc_ops->mpo_init_devfsdirent_label =
412 mpe->mpe_function;
413 break;
414 case MAC_INIT_IFNET_LABEL:
415 mpc->mpc_ops->mpo_init_ifnet_label =
416 mpe->mpe_function;
417 break;
418 case MAC_INIT_IPQ_LABEL:
419 mpc->mpc_ops->mpo_init_ipq_label =
420 mpe->mpe_function;
421 break;
422 case MAC_INIT_MBUF_LABEL:
423 mpc->mpc_ops->mpo_init_mbuf_label =
424 mpe->mpe_function;
425 break;
426 case MAC_INIT_MOUNT_LABEL:
427 mpc->mpc_ops->mpo_init_mount_label =
428 mpe->mpe_function;
429 break;
430 case MAC_INIT_MOUNT_FS_LABEL:
431 mpc->mpc_ops->mpo_init_mount_fs_label =
432 mpe->mpe_function;
433 break;
434 case MAC_INIT_PIPE_LABEL:
435 mpc->mpc_ops->mpo_init_pipe_label =
436 mpe->mpe_function;
437 break;
438 case MAC_INIT_SOCKET_LABEL:
439 mpc->mpc_ops->mpo_init_socket_label =
440 mpe->mpe_function;
441 break;
442 case MAC_INIT_SOCKET_PEER_LABEL:
443 mpc->mpc_ops->mpo_init_socket_peer_label =
444 mpe->mpe_function;
445 break;
446 case MAC_INIT_TEMP_LABEL:
447 mpc->mpc_ops->mpo_init_temp_label =
448 mpe->mpe_function;
449 break;
450 case MAC_INIT_VNODE_LABEL:
451 mpc->mpc_ops->mpo_init_vnode_label =
452 mpe->mpe_function;
453 break;
454 case MAC_DESTROY_BPFDESC_LABEL:
455 mpc->mpc_ops->mpo_destroy_bpfdesc_label =
456 mpe->mpe_function;
457 break;
458 case MAC_DESTROY_CRED_LABEL:
459 mpc->mpc_ops->mpo_destroy_cred_label =
460 mpe->mpe_function;
461 break;
462 case MAC_DESTROY_DEVFSDIRENT_LABEL:
463 mpc->mpc_ops->mpo_destroy_devfsdirent_label =
464 mpe->mpe_function;
465 break;
466 case MAC_DESTROY_IFNET_LABEL:
467 mpc->mpc_ops->mpo_destroy_ifnet_label =
468 mpe->mpe_function;
469 break;
470 case MAC_DESTROY_IPQ_LABEL:
471 mpc->mpc_ops->mpo_destroy_ipq_label =
472 mpe->mpe_function;
473 break;
474 case MAC_DESTROY_MBUF_LABEL:
475 mpc->mpc_ops->mpo_destroy_mbuf_label =
476 mpe->mpe_function;
477 break;
478 case MAC_DESTROY_MOUNT_LABEL:
479 mpc->mpc_ops->mpo_destroy_mount_label =
480 mpe->mpe_function;
481 break;
482 case MAC_DESTROY_MOUNT_FS_LABEL:
483 mpc->mpc_ops->mpo_destroy_mount_fs_label =
484 mpe->mpe_function;
485 break;
486 case MAC_DESTROY_PIPE_LABEL:
487 mpc->mpc_ops->mpo_destroy_pipe_label =
488 mpe->mpe_function;
489 break;
490 case MAC_DESTROY_SOCKET_LABEL:
491 mpc->mpc_ops->mpo_destroy_socket_label =
492 mpe->mpe_function;
493 break;
494 case MAC_DESTROY_SOCKET_PEER_LABEL:
495 mpc->mpc_ops->mpo_destroy_socket_peer_label =
496 mpe->mpe_function;
497 break;
498 case MAC_DESTROY_TEMP_LABEL:
499 mpc->mpc_ops->mpo_destroy_temp_label =
500 mpe->mpe_function;
501 break;
502 case MAC_DESTROY_VNODE_LABEL:
503 mpc->mpc_ops->mpo_destroy_vnode_label =
504 mpe->mpe_function;
505 break;
506 case MAC_EXTERNALIZE:
507 mpc->mpc_ops->mpo_externalize =
508 mpe->mpe_function;
509 break;
510 case MAC_INTERNALIZE:
511 mpc->mpc_ops->mpo_internalize =
512 mpe->mpe_function;
513 break;
514 case MAC_CREATE_DEVFS_DEVICE:
515 mpc->mpc_ops->mpo_create_devfs_device =
516 mpe->mpe_function;
517 break;
518 case MAC_CREATE_DEVFS_DIRECTORY:
519 mpc->mpc_ops->mpo_create_devfs_directory =
520 mpe->mpe_function;
521 break;
522 case MAC_CREATE_DEVFS_SYMLINK:
523 mpc->mpc_ops->mpo_create_devfs_symlink =
524 mpe->mpe_function;
525 break;
526 case MAC_CREATE_DEVFS_VNODE:
527 mpc->mpc_ops->mpo_create_devfs_vnode =
528 mpe->mpe_function;
529 break;
530 case MAC_STDCREATEVNODE_EA:
531 mpc->mpc_ops->mpo_stdcreatevnode_ea =
532 mpe->mpe_function;
533 break;
534 case MAC_CREATE_VNODE:
535 mpc->mpc_ops->mpo_create_vnode =
536 mpe->mpe_function;
537 break;
538 case MAC_CREATE_MOUNT:
539 mpc->mpc_ops->mpo_create_mount =
540 mpe->mpe_function;
541 break;
542 case MAC_CREATE_ROOT_MOUNT:
543 mpc->mpc_ops->mpo_create_root_mount =
544 mpe->mpe_function;
545 break;
546 case MAC_RELABEL_VNODE:
547 mpc->mpc_ops->mpo_relabel_vnode =
548 mpe->mpe_function;
549 break;
550 case MAC_UPDATE_DEVFSDIRENT:
551 mpc->mpc_ops->mpo_update_devfsdirent =
552 mpe->mpe_function;
553 break;
554 case MAC_UPDATE_PROCFSVNODE:
555 mpc->mpc_ops->mpo_update_procfsvnode =
556 mpe->mpe_function;
557 break;
558 case MAC_UPDATE_VNODE_FROM_EXTATTR:
559 mpc->mpc_ops->mpo_update_vnode_from_extattr =
560 mpe->mpe_function;
561 break;
562 case MAC_UPDATE_VNODE_FROM_EXTERNALIZED:
563 mpc->mpc_ops->mpo_update_vnode_from_externalized =
564 mpe->mpe_function;
565 break;
566 case MAC_UPDATE_VNODE_FROM_MOUNT:
567 mpc->mpc_ops->mpo_update_vnode_from_mount =
568 mpe->mpe_function;
569 break;
570 case MAC_CREATE_MBUF_FROM_SOCKET:
571 mpc->mpc_ops->mpo_create_mbuf_from_socket =
572 mpe->mpe_function;
573 break;
574 case MAC_CREATE_PIPE:
575 mpc->mpc_ops->mpo_create_pipe =
576 mpe->mpe_function;
577 break;
578 case MAC_CREATE_SOCKET:
579 mpc->mpc_ops->mpo_create_socket =
580 mpe->mpe_function;
581 break;
582 case MAC_CREATE_SOCKET_FROM_SOCKET:
583 mpc->mpc_ops->mpo_create_socket_from_socket =
584 mpe->mpe_function;
585 break;
586 case MAC_RELABEL_PIPE:
587 mpc->mpc_ops->mpo_relabel_pipe =
588 mpe->mpe_function;
589 break;
590 case MAC_RELABEL_SOCKET:
591 mpc->mpc_ops->mpo_relabel_socket =
592 mpe->mpe_function;
593 break;
594 case MAC_SET_SOCKET_PEER_FROM_MBUF:
595 mpc->mpc_ops->mpo_set_socket_peer_from_mbuf =
596 mpe->mpe_function;
597 break;
598 case MAC_SET_SOCKET_PEER_FROM_SOCKET:
599 mpc->mpc_ops->mpo_set_socket_peer_from_socket =
600 mpe->mpe_function;
601 break;
602 case MAC_CREATE_BPFDESC:
603 mpc->mpc_ops->mpo_create_bpfdesc =
604 mpe->mpe_function;
605 break;
606 case MAC_CREATE_DATAGRAM_FROM_IPQ:
607 mpc->mpc_ops->mpo_create_datagram_from_ipq =
608 mpe->mpe_function;
609 break;
610 case MAC_CREATE_FRAGMENT:
611 mpc->mpc_ops->mpo_create_fragment =
612 mpe->mpe_function;
613 break;
614 case MAC_CREATE_IFNET:
615 mpc->mpc_ops->mpo_create_ifnet =
616 mpe->mpe_function;
617 break;
618 case MAC_CREATE_IPQ:
619 mpc->mpc_ops->mpo_create_ipq =
620 mpe->mpe_function;
621 break;
622 case MAC_CREATE_MBUF_FROM_MBUF:
623 mpc->mpc_ops->mpo_create_mbuf_from_mbuf =
624 mpe->mpe_function;
625 break;
626 case MAC_CREATE_MBUF_LINKLAYER:
627 mpc->mpc_ops->mpo_create_mbuf_linklayer =
628 mpe->mpe_function;
629 break;
630 case MAC_CREATE_MBUF_FROM_BPFDESC:
631 mpc->mpc_ops->mpo_create_mbuf_from_bpfdesc =
632 mpe->mpe_function;
633 break;
634 case MAC_CREATE_MBUF_FROM_IFNET:
635 mpc->mpc_ops->mpo_create_mbuf_from_ifnet =
636 mpe->mpe_function;
637 break;
638 case MAC_CREATE_MBUF_MULTICAST_ENCAP:
639 mpc->mpc_ops->mpo_create_mbuf_multicast_encap =
640 mpe->mpe_function;
641 break;
642 case MAC_CREATE_MBUF_NETLAYER:
643 mpc->mpc_ops->mpo_create_mbuf_netlayer =
644 mpe->mpe_function;
645 break;
646 case MAC_FRAGMENT_MATCH:
647 mpc->mpc_ops->mpo_fragment_match =
648 mpe->mpe_function;
649 break;
650 case MAC_RELABEL_IFNET:
651 mpc->mpc_ops->mpo_relabel_ifnet =
652 mpe->mpe_function;
653 break;
654 case MAC_UPDATE_IPQ:
655 mpc->mpc_ops->mpo_update_ipq =
656 mpe->mpe_function;
657 break;
658 case MAC_CREATE_CRED:
659 mpc->mpc_ops->mpo_create_cred =
660 mpe->mpe_function;
661 break;
662 case MAC_EXECVE_TRANSITION:
663 mpc->mpc_ops->mpo_execve_transition =
664 mpe->mpe_function;
665 break;
666 case MAC_EXECVE_WILL_TRANSITION:
667 mpc->mpc_ops->mpo_execve_will_transition =
668 mpe->mpe_function;
669 break;
670 case MAC_CREATE_PROC0:
671 mpc->mpc_ops->mpo_create_proc0 =
672 mpe->mpe_function;
673 break;
674 case MAC_CREATE_PROC1:
675 mpc->mpc_ops->mpo_create_proc1 =
676 mpe->mpe_function;
677 break;
678 case MAC_RELABEL_CRED:
679 mpc->mpc_ops->mpo_relabel_cred =
680 mpe->mpe_function;
681 break;
682 case MAC_THREAD_USERRET:
683 mpc->mpc_ops->mpo_thread_userret =
684 mpe->mpe_function;
685 break;
686 case MAC_CHECK_BPFDESC_RECEIVE:
687 mpc->mpc_ops->mpo_check_bpfdesc_receive =
688 mpe->mpe_function;
689 break;
690 case MAC_CHECK_CRED_RELABEL:
691 mpc->mpc_ops->mpo_check_cred_relabel =
692 mpe->mpe_function;
693 break;
694 case MAC_CHECK_CRED_VISIBLE:
695 mpc->mpc_ops->mpo_check_cred_visible =
696 mpe->mpe_function;
697 break;
698 case MAC_CHECK_IFNET_RELABEL:
699 mpc->mpc_ops->mpo_check_ifnet_relabel =
700 mpe->mpe_function;
701 break;
702 case MAC_CHECK_IFNET_TRANSMIT:
703 mpc->mpc_ops->mpo_check_ifnet_transmit =
704 mpe->mpe_function;
705 break;
706 case MAC_CHECK_MOUNT_STAT:
707 mpc->mpc_ops->mpo_check_mount_stat =
708 mpe->mpe_function;
709 break;
710 case MAC_CHECK_PIPE_IOCTL:
711 mpc->mpc_ops->mpo_check_pipe_ioctl =
712 mpe->mpe_function;
713 break;
714 case MAC_CHECK_PIPE_POLL:
715 mpc->mpc_ops->mpo_check_pipe_poll =
716 mpe->mpe_function;
717 break;
718 case MAC_CHECK_PIPE_READ:
719 mpc->mpc_ops->mpo_check_pipe_read =
720 mpe->mpe_function;
721 break;
722 case MAC_CHECK_PIPE_RELABEL:
723 mpc->mpc_ops->mpo_check_pipe_relabel =
724 mpe->mpe_function;
725 break;
726 case MAC_CHECK_PIPE_STAT:
727 mpc->mpc_ops->mpo_check_pipe_stat =
728 mpe->mpe_function;
729 break;
730 case MAC_CHECK_PIPE_WRITE:
731 mpc->mpc_ops->mpo_check_pipe_write =
732 mpe->mpe_function;
733 break;
734 case MAC_CHECK_PROC_DEBUG:
735 mpc->mpc_ops->mpo_check_proc_debug =
736 mpe->mpe_function;
737 break;
738 case MAC_CHECK_PROC_SCHED:
739 mpc->mpc_ops->mpo_check_proc_sched =
740 mpe->mpe_function;
741 break;
742 case MAC_CHECK_PROC_SIGNAL:
743 mpc->mpc_ops->mpo_check_proc_signal =
744 mpe->mpe_function;
745 break;
746 case MAC_CHECK_SOCKET_BIND:
747 mpc->mpc_ops->mpo_check_socket_bind =
748 mpe->mpe_function;
749 break;
750 case MAC_CHECK_SOCKET_CONNECT:
751 mpc->mpc_ops->mpo_check_socket_connect =
752 mpe->mpe_function;
753 break;
754 case MAC_CHECK_SOCKET_DELIVER:
755 mpc->mpc_ops->mpo_check_socket_deliver =
756 mpe->mpe_function;
757 break;
758 case MAC_CHECK_SOCKET_LISTEN:
759 mpc->mpc_ops->mpo_check_socket_listen =
760 mpe->mpe_function;
761 break;
762 case MAC_CHECK_SOCKET_RECEIVE:
763 mpc->mpc_ops->mpo_check_socket_receive =
764 mpe->mpe_function;
765 break;
766 case MAC_CHECK_SOCKET_RELABEL:
767 mpc->mpc_ops->mpo_check_socket_relabel =
768 mpe->mpe_function;
769 break;
770 case MAC_CHECK_SOCKET_SEND:
771 mpc->mpc_ops->mpo_check_socket_send =
772 mpe->mpe_function;
773 break;
774 case MAC_CHECK_SOCKET_VISIBLE:
775 mpc->mpc_ops->mpo_check_socket_visible =
776 mpe->mpe_function;
777 break;
778 case MAC_CHECK_VNODE_ACCESS:
779 mpc->mpc_ops->mpo_check_vnode_access =
780 mpe->mpe_function;
781 break;
782 case MAC_CHECK_VNODE_CHDIR:
783 mpc->mpc_ops->mpo_check_vnode_chdir =
784 mpe->mpe_function;
785 break;
786 case MAC_CHECK_VNODE_CHROOT:
787 mpc->mpc_ops->mpo_check_vnode_chroot =
788 mpe->mpe_function;
789 break;
790 case MAC_CHECK_VNODE_CREATE:
791 mpc->mpc_ops->mpo_check_vnode_create =
792 mpe->mpe_function;
793 break;
794 case MAC_CHECK_VNODE_DELETE:
795 mpc->mpc_ops->mpo_check_vnode_delete =
796 mpe->mpe_function;
797 break;
798 case MAC_CHECK_VNODE_DELETEACL:
799 mpc->mpc_ops->mpo_check_vnode_deleteacl =
800 mpe->mpe_function;
801 break;
802 case MAC_CHECK_VNODE_EXEC:
803 mpc->mpc_ops->mpo_check_vnode_exec =
804 mpe->mpe_function;
805 break;
806 case MAC_CHECK_VNODE_GETACL:
807 mpc->mpc_ops->mpo_check_vnode_getacl =
808 mpe->mpe_function;
809 break;
810 case MAC_CHECK_VNODE_GETEXTATTR:
811 mpc->mpc_ops->mpo_check_vnode_getextattr =
812 mpe->mpe_function;
813 break;
814 case MAC_CHECK_VNODE_LINK:
815 mpc->mpc_ops->mpo_check_vnode_link =
816 mpe->mpe_function;
817 break;
818 case MAC_CHECK_VNODE_LOOKUP:
819 mpc->mpc_ops->mpo_check_vnode_lookup =
820 mpe->mpe_function;
821 break;
822 case MAC_CHECK_VNODE_MMAP:
823 mpc->mpc_ops->mpo_check_vnode_mmap =
824 mpe->mpe_function;
825 break;
826 case MAC_CHECK_VNODE_MMAP_DOWNGRADE:
827 mpc->mpc_ops->mpo_check_vnode_mmap_downgrade =
828 mpe->mpe_function;
829 break;
830 case MAC_CHECK_VNODE_MPROTECT:
831 mpc->mpc_ops->mpo_check_vnode_mprotect =
832 mpe->mpe_function;
833 break;
834 case MAC_CHECK_VNODE_OPEN:
835 mpc->mpc_ops->mpo_check_vnode_open =
836 mpe->mpe_function;
837 break;
838 case MAC_CHECK_VNODE_POLL:
839 mpc->mpc_ops->mpo_check_vnode_poll =
840 mpe->mpe_function;
841 break;
842 case MAC_CHECK_VNODE_READ:
843 mpc->mpc_ops->mpo_check_vnode_read =
844 mpe->mpe_function;
845 break;
846 case MAC_CHECK_VNODE_READDIR:
847 mpc->mpc_ops->mpo_check_vnode_readdir =
848 mpe->mpe_function;
849 break;
850 case MAC_CHECK_VNODE_READLINK:
851 mpc->mpc_ops->mpo_check_vnode_readlink =
852 mpe->mpe_function;
853 break;
854 case MAC_CHECK_VNODE_RELABEL:
855 mpc->mpc_ops->mpo_check_vnode_relabel =
856 mpe->mpe_function;
857 break;
858 case MAC_CHECK_VNODE_RENAME_FROM:
859 mpc->mpc_ops->mpo_check_vnode_rename_from =
860 mpe->mpe_function;
861 break;
862 case MAC_CHECK_VNODE_RENAME_TO:
863 mpc->mpc_ops->mpo_check_vnode_rename_to =
864 mpe->mpe_function;
865 break;
866 case MAC_CHECK_VNODE_REVOKE:
867 mpc->mpc_ops->mpo_check_vnode_revoke =
868 mpe->mpe_function;
869 break;
870 case MAC_CHECK_VNODE_SETACL:
871 mpc->mpc_ops->mpo_check_vnode_setacl =
872 mpe->mpe_function;
873 break;
874 case MAC_CHECK_VNODE_SETEXTATTR:
875 mpc->mpc_ops->mpo_check_vnode_setextattr =
876 mpe->mpe_function;
877 break;
878 case MAC_CHECK_VNODE_SETFLAGS:
879 mpc->mpc_ops->mpo_check_vnode_setflags =
880 mpe->mpe_function;
881 break;
882 case MAC_CHECK_VNODE_SETMODE:
883 mpc->mpc_ops->mpo_check_vnode_setmode =
884 mpe->mpe_function;
885 break;
886 case MAC_CHECK_VNODE_SETOWNER:
887 mpc->mpc_ops->mpo_check_vnode_setowner =
888 mpe->mpe_function;
889 break;
890 case MAC_CHECK_VNODE_SETUTIMES:
891 mpc->mpc_ops->mpo_check_vnode_setutimes =
892 mpe->mpe_function;
893 break;
894 case MAC_CHECK_VNODE_STAT:
895 mpc->mpc_ops->mpo_check_vnode_stat =
896 mpe->mpe_function;
897 break;
898 case MAC_CHECK_VNODE_WRITE:
899 mpc->mpc_ops->mpo_check_vnode_write =
900 mpe->mpe_function;
901 break;
902/*
903 default:
904 printf("MAC policy `%s': unknown operation %d\n",
905 mpc->mpc_name, mpe->mpe_constant);
906 return (EINVAL);
907*/
908 }
909 }
910 MAC_POLICY_LIST_LOCK();
911 if (mac_policy_list_busy > 0) {
912 MAC_POLICY_LIST_UNLOCK();
913 FREE(mpc->mpc_ops, M_MACOPVEC);
914 mpc->mpc_ops = NULL;
915 return (EBUSY);
916 }
917 LIST_FOREACH(tmpc, &mac_policy_list, mpc_list) {
918 if (strcmp(tmpc->mpc_name, mpc->mpc_name) == 0) {
919 MAC_POLICY_LIST_UNLOCK();
920 FREE(mpc->mpc_ops, M_MACOPVEC);
921 mpc->mpc_ops = NULL;
922 return (EEXIST);
923 }
924 }
925 if (mpc->mpc_field_off != NULL) {
926 slot = ffs(mac_policy_offsets_free);
927 if (slot == 0) {
928 MAC_POLICY_LIST_UNLOCK();
929 FREE(mpc->mpc_ops, M_MACOPVEC);
930 mpc->mpc_ops = NULL;
931 return (ENOMEM);
932 }
933 slot--;
934 mac_policy_offsets_free &= ~(1 << slot);
935 *mpc->mpc_field_off = slot;
936 }
937 mpc->mpc_runtime_flags |= MPC_RUNTIME_FLAG_REGISTERED;
938 LIST_INSERT_HEAD(&mac_policy_list, mpc, mpc_list);
939
940 /* Per-policy initialization. */
941 if (mpc->mpc_ops->mpo_init != NULL)
942 (*(mpc->mpc_ops->mpo_init))(mpc);
943 MAC_POLICY_LIST_UNLOCK();
944
945 printf("Security policy loaded: %s (%s)\n", mpc->mpc_fullname,
946 mpc->mpc_name);
947
948 return (0);
949}
950
951static int
952mac_policy_unregister(struct mac_policy_conf *mpc)
953{
954
955 /*
956 * If we fail the load, we may get a request to unload. Check
957 * to see if we did the run-time registration, and if not,
958 * silently succeed.
959 */
960 MAC_POLICY_LIST_LOCK();
961 if ((mpc->mpc_runtime_flags & MPC_RUNTIME_FLAG_REGISTERED) == 0) {
962 MAC_POLICY_LIST_UNLOCK();
963 return (0);
964 }
965#if 0
966 /*
967 * Don't allow unloading modules with private data.
968 */
969 if (mpc->mpc_field_off != NULL) {
970 MAC_POLICY_LIST_UNLOCK();
971 return (EBUSY);
972 }
973#endif
974 /*
975 * Only allow the unload to proceed if the module is unloadable
976 * by its own definition.
977 */
978 if ((mpc->mpc_loadtime_flags & MPC_LOADTIME_FLAG_UNLOADOK) == 0) {
979 MAC_POLICY_LIST_UNLOCK();
980 return (EBUSY);
981 }
982 /*
983 * Right now, we EBUSY if the list is in use. In the future,
984 * for reliability reasons, we might want to sleep and wakeup
985 * later to try again.
986 */
987 if (mac_policy_list_busy > 0) {
988 MAC_POLICY_LIST_UNLOCK();
989 return (EBUSY);
990 }
991 if (mpc->mpc_ops->mpo_destroy != NULL)
992 (*(mpc->mpc_ops->mpo_destroy))(mpc);
993
994 LIST_REMOVE(mpc, mpc_list);
995 MAC_POLICY_LIST_UNLOCK();
996
997 FREE(mpc->mpc_ops, M_MACOPVEC);
998 mpc->mpc_ops = NULL;
999 mpc->mpc_runtime_flags &= ~MPC_RUNTIME_FLAG_REGISTERED;
1000
1001 printf("Security policy unload: %s (%s)\n", mpc->mpc_fullname,
1002 mpc->mpc_name);
1003
1004 return (0);
1005}
1006
1007/*
1008 * Define an error value precedence, and given two arguments, selects the
1009 * value with the higher precedence.
1010 */
1011static int
1012error_select(int error1, int error2)
1013{
1014
1015 /* Certain decision-making errors take top priority. */
1016 if (error1 == EDEADLK || error2 == EDEADLK)
1017 return (EDEADLK);
1018
1019 /* Invalid arguments should be reported where possible. */
1020 if (error1 == EINVAL || error2 == EINVAL)
1021 return (EINVAL);
1022
1023 /* Precedence goes to "visibility", with both process and file. */
1024 if (error1 == ESRCH || error2 == ESRCH)
1025 return (ESRCH);
1026
1027 if (error1 == ENOENT || error2 == ENOENT)
1028 return (ENOENT);
1029
1030 /* Precedence goes to DAC/MAC protections. */
1031 if (error1 == EACCES || error2 == EACCES)
1032 return (EACCES);
1033
1034 /* Precedence goes to privilege. */
1035 if (error1 == EPERM || error2 == EPERM)
1036 return (EPERM);
1037
1038 /* Precedence goes to error over success; otherwise, arbitrary. */
1039 if (error1 != 0)
1040 return (error1);
1041 return (error2);
1042}
1043
1044static void
1045mac_init_label(struct label *label)
1046{
1047
1048 bzero(label, sizeof(*label));
1049 label->l_flags = MAC_FLAG_INITIALIZED;
1050}
1051
1052static void
1053mac_destroy_label(struct label *label)
1054{
1055
1056 KASSERT(label->l_flags & MAC_FLAG_INITIALIZED,
1057 ("destroying uninitialized label"));
1058
1059 bzero(label, sizeof(*label));
1060 /* implicit: label->l_flags &= ~MAC_FLAG_INITIALIZED; */
1061}
1062
1063static void
1064mac_init_structmac(struct mac *mac)
1065{
1066
1067 bzero(mac, sizeof(*mac));
1068 mac->m_macflags = MAC_FLAG_INITIALIZED;
1069}
1070
1071void
1072mac_init_bpfdesc(struct bpf_d *bpf_d)
1073{
1074
1075 mac_init_label(&bpf_d->bd_label);
1076 MAC_PERFORM(init_bpfdesc_label, &bpf_d->bd_label);
1077#ifdef MAC_DEBUG
1078 atomic_add_int(&nmacbpfdescs, 1);
1079#endif
1080}
1081
1082void
1083mac_init_cred(struct ucred *cr)
1084{
1085
1086 mac_init_label(&cr->cr_label);
1087 MAC_PERFORM(init_cred_label, &cr->cr_label);
1088#ifdef MAC_DEBUG
1089 atomic_add_int(&nmaccreds, 1);
1090#endif
1091}
1092
1093void
1094mac_init_devfsdirent(struct devfs_dirent *de)
1095{
1096
1097 mac_init_label(&de->de_label);
1098 MAC_PERFORM(init_devfsdirent_label, &de->de_label);
1099#ifdef MAC_DEBUG
1100 atomic_add_int(&nmacdevfsdirents, 1);
1101#endif
1102}
1103
1104void
1105mac_init_ifnet(struct ifnet *ifp)
1106{
1107
1108 mac_init_label(&ifp->if_label);
1109 MAC_PERFORM(init_ifnet_label, &ifp->if_label);
1110#ifdef MAC_DEBUG
1111 atomic_add_int(&nmacifnets, 1);
1112#endif
1113}
1114
1115void
1116mac_init_ipq(struct ipq *ipq)
1117{
1118
1119 mac_init_label(&ipq->ipq_label);
1120 MAC_PERFORM(init_ipq_label, &ipq->ipq_label);
1121#ifdef MAC_DEBUG
1122 atomic_add_int(&nmacipqs, 1);
1123#endif
1124}
1125
1126int
1127mac_init_mbuf(struct mbuf *m, int flag)
1128{
1129 int error;
1130
1131 KASSERT(m->m_flags & M_PKTHDR, ("mac_init_mbuf on non-header mbuf"));
1132
1133 mac_init_label(&m->m_pkthdr.label);
1134
1135 MAC_CHECK(init_mbuf_label, &m->m_pkthdr.label, flag);
1136 if (error) {
1137 MAC_PERFORM(destroy_mbuf_label, &m->m_pkthdr.label);
1138 mac_destroy_label(&m->m_pkthdr.label);
1139 }
1140
1141#ifdef MAC_DEBUG
1142 if (error == 0)
1143 atomic_add_int(&nmacmbufs, 1);
1144#endif
1145 return (error);
1146}
1147
1148void
1149mac_init_mount(struct mount *mp)
1150{
1151
1152 mac_init_label(&mp->mnt_mntlabel);
1153 mac_init_label(&mp->mnt_fslabel);
1154 MAC_PERFORM(init_mount_label, &mp->mnt_mntlabel);
1155 MAC_PERFORM(init_mount_fs_label, &mp->mnt_fslabel);
1156#ifdef MAC_DEBUG
1157 atomic_add_int(&nmacmounts, 1);
1158#endif
1159}
1160
1161void
1162mac_init_pipe(struct pipe *pipe)
1163{
1164 struct label *label;
1165
1166 label = malloc(sizeof(struct label), M_MACPIPELABEL, M_ZERO|M_WAITOK);
1167 mac_init_label(label);
1168 pipe->pipe_label = label;
1169 pipe->pipe_peer->pipe_label = label;
1170 MAC_PERFORM(init_pipe_label, pipe->pipe_label);
1171#ifdef MAC_DEBUG
1172 atomic_add_int(&nmacpipes, 1);
1173#endif
1174}
1175
1176static int
1177mac_init_socket_label(struct label *label, int flag)
1178{
1179 int error;
1180
1181 mac_init_label(label);
1182
1183 MAC_CHECK(init_socket_label, label, flag);
1184 if (error) {
1185 MAC_PERFORM(destroy_socket_label, label);
1186 mac_destroy_label(label);
1187 }
1188
1189#ifdef MAC_DEBUG
1190 if (error == 0)
1191 atomic_add_int(&nmacsockets, 1);
1192#endif
1193
1194 return (error);
1195}
1196
1197static int
1198mac_init_socket_peer_label(struct label *label, int flag)
1199{
1200 int error;
1201
1202 mac_init_label(label);
1203
1204 MAC_CHECK(init_socket_peer_label, label, flag);
1205 if (error) {
1206 MAC_PERFORM(destroy_socket_label, label);
1207 mac_destroy_label(label);
1208 }
1209
1210 return (error);
1211}
1212
1213int
1214mac_init_socket(struct socket *socket, int flag)
1215{
1216 int error;
1217
1218 error = mac_init_socket_label(&socket->so_label, flag);
1219 if (error)
1220 return (error);
1221
1222 error = mac_init_socket_peer_label(&socket->so_peerlabel, flag);
1223 if (error)
1224 mac_destroy_socket_label(&socket->so_label);
1225
1226 return (error);
1227}
1228
1229static void
1230mac_init_temp(struct label *label)
1231{
1232
1233 mac_init_label(label);
1234 MAC_PERFORM(init_temp_label, label);
1235#ifdef MAC_DEBUG
1236 atomic_add_int(&nmactemp, 1);
1237#endif
1238}
1239
1240void
1241mac_init_vnode(struct vnode *vp)
1242{
1243
1244 mac_init_label(&vp->v_label);
1245 MAC_PERFORM(init_vnode_label, &vp->v_label);
1246#ifdef MAC_DEBUG
1247 atomic_add_int(&nmacvnodes, 1);
1248#endif
1249}
1250
1251void
1252mac_destroy_bpfdesc(struct bpf_d *bpf_d)
1253{
1254
1255 MAC_PERFORM(destroy_bpfdesc_label, &bpf_d->bd_label);
1256 mac_destroy_label(&bpf_d->bd_label);
1257#ifdef MAC_DEBUG
1258 atomic_subtract_int(&nmacbpfdescs, 1);
1259#endif
1260}
1261
1262void
1263mac_destroy_cred(struct ucred *cr)
1264{
1265
1266 MAC_PERFORM(destroy_cred_label, &cr->cr_label);
1267 mac_destroy_label(&cr->cr_label);
1268#ifdef MAC_DEBUG
1269 atomic_subtract_int(&nmaccreds, 1);
1270#endif
1271}
1272
1273void
1274mac_destroy_devfsdirent(struct devfs_dirent *de)
1275{
1276
1277 MAC_PERFORM(destroy_devfsdirent_label, &de->de_label);
1278 mac_destroy_label(&de->de_label);
1279#ifdef MAC_DEBUG
1280 atomic_subtract_int(&nmacdevfsdirents, 1);
1281#endif
1282}
1283
1284void
1285mac_destroy_ifnet(struct ifnet *ifp)
1286{
1287
1288 MAC_PERFORM(destroy_ifnet_label, &ifp->if_label);
1289 mac_destroy_label(&ifp->if_label);
1290#ifdef MAC_DEBUG
1291 atomic_subtract_int(&nmacifnets, 1);
1292#endif
1293}
1294
1295void
1296mac_destroy_ipq(struct ipq *ipq)
1297{
1298
1299 MAC_PERFORM(destroy_ipq_label, &ipq->ipq_label);
1300 mac_destroy_label(&ipq->ipq_label);
1301#ifdef MAC_DEBUG
1302 atomic_subtract_int(&nmacipqs, 1);
1303#endif
1304}
1305
1306void
1307mac_destroy_mbuf(struct mbuf *m)
1308{
1309
1310 MAC_PERFORM(destroy_mbuf_label, &m->m_pkthdr.label);
1311 mac_destroy_label(&m->m_pkthdr.label);
1312#ifdef MAC_DEBUG
1313 atomic_subtract_int(&nmacmbufs, 1);
1314#endif
1315}
1316
1317void
1318mac_destroy_mount(struct mount *mp)
1319{
1320
1321 MAC_PERFORM(destroy_mount_label, &mp->mnt_mntlabel);
1322 MAC_PERFORM(destroy_mount_fs_label, &mp->mnt_fslabel);
1323 mac_destroy_label(&mp->mnt_fslabel);
1324 mac_destroy_label(&mp->mnt_mntlabel);
1325#ifdef MAC_DEBUG
1326 atomic_subtract_int(&nmacmounts, 1);
1327#endif
1328}
1329
1330void
1331mac_destroy_pipe(struct pipe *pipe)
1332{
1333
1334 MAC_PERFORM(destroy_pipe_label, pipe->pipe_label);
1335 mac_destroy_label(pipe->pipe_label);
1336 free(pipe->pipe_label, M_MACPIPELABEL);
1337#ifdef MAC_DEBUG
1338 atomic_subtract_int(&nmacpipes, 1);
1339#endif
1340}
1341
1342static void
1343mac_destroy_socket_label(struct label *label)
1344{
1345
1346 MAC_PERFORM(destroy_socket_label, label);
1347 mac_destroy_label(label);
1348#ifdef MAC_DEBUG
1349 atomic_subtract_int(&nmacsockets, 1);
1350#endif
1351}
1352
1353static void
1354mac_destroy_socket_peer_label(struct label *label)
1355{
1356
1357 MAC_PERFORM(destroy_socket_peer_label, label);
1358 mac_destroy_label(label);
1359}
1360
1361void
1362mac_destroy_socket(struct socket *socket)
1363{
1364
1365 mac_destroy_socket_label(&socket->so_label);
1366 mac_destroy_socket_peer_label(&socket->so_peerlabel);
1367}
1368
1369static void
1370mac_destroy_temp(struct label *label)
1371{
1372
1373 MAC_PERFORM(destroy_temp_label, label);
1374 mac_destroy_label(label);
1375#ifdef MAC_DEBUG
1376 atomic_subtract_int(&nmactemp, 1);
1377#endif
1378}
1379
1380void
1381mac_destroy_vnode(struct vnode *vp)
1382{
1383
1384 MAC_PERFORM(destroy_vnode_label, &vp->v_label);
1385 mac_destroy_label(&vp->v_label);
1386#ifdef MAC_DEBUG
1387 atomic_subtract_int(&nmacvnodes, 1);
1388#endif
1389}
1390
1391static int
1392mac_externalize(struct label *label, struct mac *mac)
1393{
1394 int error;
1395
1396 mac_init_structmac(mac);
1397 MAC_CHECK(externalize, label, mac);
1398
1399 return (error);
1400}
1401
1402static int
1403mac_internalize(struct label *label, struct mac *mac)
1404{
1405 int error;
1406
1407 mac_init_temp(label);
1408 MAC_CHECK(internalize, label, mac);
1409 if (error)
1410 mac_destroy_temp(label);
1411
1412 return (error);
1413}
1414
1415/*
1416 * Initialize MAC label for the first kernel process, from which other
1417 * kernel processes and threads are spawned.
1418 */
1419void
1420mac_create_proc0(struct ucred *cred)
1421{
1422
1423 MAC_PERFORM(create_proc0, cred);
1424}
1425
1426/*
1427 * Initialize MAC label for the first userland process, from which other
1428 * userland processes and threads are spawned.
1429 */
1430void
1431mac_create_proc1(struct ucred *cred)
1432{
1433
1434 MAC_PERFORM(create_proc1, cred);
1435}
1436
1437void
1438mac_thread_userret(struct thread *td)
1439{
1440
1441 MAC_PERFORM(thread_userret, td);
1442}
1443
1444/*
1445 * When a new process is created, its label must be initialized. Generally,
1446 * this involves inheritence from the parent process, modulo possible
1447 * deltas. This function allows that processing to take place.
1448 */
1449void
1450mac_create_cred(struct ucred *parent_cred, struct ucred *child_cred)
1451{
1452
1453 MAC_PERFORM(create_cred, parent_cred, child_cred);
1454}
1455
1456void
1457mac_update_devfsdirent(struct devfs_dirent *de, struct vnode *vp)
1458{
1459
1460 MAC_PERFORM(update_devfsdirent, de, &de->de_label, vp, &vp->v_label);
1461}
1462
1463void
1464mac_update_procfsvnode(struct vnode *vp, struct ucred *cred)
1465{
1466
1467 MAC_PERFORM(update_procfsvnode, vp, &vp->v_label, cred);
1468}
1469
1470/*
1471 * Support callout for policies that manage their own externalization
1472 * using extended attributes.
1473 */
1474static int
1475mac_update_vnode_from_extattr(struct vnode *vp, struct mount *mp)
1476{
1477 int error;
1478
1479 MAC_CHECK(update_vnode_from_extattr, vp, &vp->v_label, mp,
1480 &mp->mnt_fslabel);
1481
1482 return (error);
1483}
1484
1485/*
1486 * Given an externalized mac label, internalize it and stamp it on a
1487 * vnode.
1488 */
1489static int
1490mac_update_vnode_from_externalized(struct vnode *vp, struct mac *extmac)
1491{
1492 int error;
1493
1494 MAC_CHECK(update_vnode_from_externalized, vp, &vp->v_label, extmac);
1495
1496 return (error);
1497}
1498
1499/*
1500 * Call out to individual policies to update the label in a vnode from
1501 * the mountpoint.
1502 */
1503void
1504mac_update_vnode_from_mount(struct vnode *vp, struct mount *mp)
1505{
1506
1507 MAC_PERFORM(update_vnode_from_mount, vp, &vp->v_label, mp,
1508 &mp->mnt_fslabel);
1509
1510 ASSERT_VOP_LOCKED(vp, "mac_update_vnode_from_mount");
1511 if (mac_cache_fslabel_in_vnode)
1512 vp->v_vflag |= VV_CACHEDLABEL;
1513}
1514
1515/*
1516 * Implementation of VOP_REFRESHLABEL() that relies on extended attributes
1517 * to store label data. Can be referenced by filesystems supporting
1518 * extended attributes.
1519 */
1520int
1521vop_stdrefreshlabel_ea(struct vop_refreshlabel_args *ap)
1522{
1523 struct vnode *vp = ap->a_vp;
1524 struct mac extmac;
1525 int buflen, error;
1526
1527 ASSERT_VOP_LOCKED(vp, "vop_stdrefreshlabel_ea");
1528
1529 /*
1530 * Call out to external policies first. Order doesn't really
1531 * matter, as long as failure of one assures failure of all.
1532 */
1533 error = mac_update_vnode_from_extattr(vp, vp->v_mount);
1534 if (error)
1535 return (error);
1536
1537 buflen = sizeof(extmac);
1538 error = vn_extattr_get(vp, IO_NODELOCKED,
1539 FREEBSD_MAC_EXTATTR_NAMESPACE, FREEBSD_MAC_EXTATTR_NAME, &buflen,
1540 (char *)&extmac, curthread);
1541 switch (error) {
1542 case 0:
1543 /* Got it */
1544 break;
1545
1546 case ENOATTR:
1547 /*
1548 * Use the label from the mount point.
1549 */
1550 mac_update_vnode_from_mount(vp, vp->v_mount);
1551 return (0);
1552
1553 case EOPNOTSUPP:
1554 default:
1555 /* Fail horribly. */
1556 return (error);
1557 }
1558
1559 if (buflen != sizeof(extmac))
1560 error = EPERM; /* Fail very closed. */
1561 if (error == 0)
1562 error = mac_update_vnode_from_externalized(vp, &extmac);
1563 if (error == 0)
1564 vp->v_vflag |= VV_CACHEDLABEL;
1565 else {
1566 struct vattr va;
1567
1568 printf("Corrupted label on %s",
1569 vp->v_mount->mnt_stat.f_mntonname);
1570 if (VOP_GETATTR(vp, &va, curthread->td_ucred, curthread) == 0)
1571 printf(" inum %ld", va.va_fileid);
1572#ifdef MAC_DEBUG
1573 if (mac_debug_label_fallback) {
1574 printf(", falling back.\n");
1575 mac_update_vnode_from_mount(vp, vp->v_mount);
1576 error = 0;
1577 } else {
1578#endif
1579 printf(".\n");
1580 error = EPERM;
1581#ifdef MAC_DEBUG
1582 }
1583#endif
1584 }
1585
1586 return (error);
1587}
1588
1589/*
1590 * Make sure the vnode label is up-to-date. If EOPNOTSUPP, then we handle
1591 * the labeling activity outselves. Filesystems should be careful not
1592 * to change their minds regarding whether they support vop_refreshlabel()
1593 * for a vnode or not. Don't cache the vnode here, allow the file
1594 * system code to determine if it's safe to cache. If we update from
1595 * the mount, don't cache since a change to the mount label should affect
1596 * all vnodes.
1597 */
1598static int
1599vn_refreshlabel(struct vnode *vp, struct ucred *cred)
1600{
1601 int error;
1602
1603 ASSERT_VOP_LOCKED(vp, "vn_refreshlabel");
1604
1605 if (vp->v_mount == NULL) {
1606/*
1607 Eventually, we probably want to special-case refreshing
1608 of deadfs vnodes, and if there's a lock-free race somewhere,
1609 that case might be handled here.
1610
1611 mac_update_vnode_deadfs(vp);
1612 return (0);
1613 */
1614 /* printf("vn_refreshlabel: null v_mount\n"); */
1615 if (vp->v_type != VNON)
1616 printf(
1617 "vn_refreshlabel: null v_mount with non-VNON\n");
1618 return (EBADF);
1619 }
1620
1621 if (vp->v_vflag & VV_CACHEDLABEL) {
1622 mac_vnode_label_cache_hits++;
1623 return (0);
1624 } else
1625 mac_vnode_label_cache_misses++;
1626
1627 if ((vp->v_mount->mnt_flag & MNT_MULTILABEL) == 0) {
1628 mac_update_vnode_from_mount(vp, vp->v_mount);
1629 return (0);
1630 }
1631
1632 error = VOP_REFRESHLABEL(vp, cred, curthread);
1633 switch (error) {
1634 case EOPNOTSUPP:
1635 /*
1636 * If labels are not supported on this vnode, fall back to
1637 * the label in the mount and propagate it to the vnode.
1638 * There should probably be some sort of policy/flag/decision
1639 * about doing this.
1640 */
1641 mac_update_vnode_from_mount(vp, vp->v_mount);
1642 error = 0;
1643 default:
1644 return (error);
1645 }
1646}
1647
1648/*
1649 * Helper function for file systems using the vop_std*_ea() calls. This
1650 * function must be called after EA service is available for the vnode,
1651 * but before it's hooked up to the namespace so that the node persists
1652 * if there's a crash, or before it can be accessed. On successful
1653 * commit of the label to disk (etc), do cache the label.
1654 */
1655int
1656vop_stdcreatevnode_ea(struct vnode *dvp, struct vnode *tvp, struct ucred *cred)
1657{
1658 struct mac extmac;
1659 int error;
1660
1661 ASSERT_VOP_LOCKED(tvp, "vop_stdcreatevnode_ea");
1662 if ((dvp->v_mount->mnt_flag & MNT_MULTILABEL) == 0) {
1663 mac_update_vnode_from_mount(tvp, tvp->v_mount);
1664 } else {
1665 error = vn_refreshlabel(dvp, cred);
1666 if (error)
1667 return (error);
1668
1669 /*
1670 * Stick the label in the vnode. Then try to write to
1671 * disk. If we fail, return a failure to abort the
1672 * create operation. Really, this failure shouldn't
1673 * happen except in fairly unusual circumstances (out
1674 * of disk, etc).
1675 */
1676 mac_create_vnode(cred, dvp, tvp);
1677
1678 error = mac_stdcreatevnode_ea(tvp);
1679 if (error)
1680 return (error);
1681
1682 /*
1683 * XXX: Eventually this will go away and all policies will
1684 * directly manage their extended attributes.
1685 */
1686 error = mac_externalize(&tvp->v_label, &extmac);
1687 if (error)
1688 return (error);
1689
1690 error = vn_extattr_set(tvp, IO_NODELOCKED,
1691 FREEBSD_MAC_EXTATTR_NAMESPACE, FREEBSD_MAC_EXTATTR_NAME,
1692 sizeof(extmac), (char *)&extmac, curthread);
1693 if (error == 0)
1694 tvp->v_vflag |= VV_CACHEDLABEL;
1695 else {
1696#if 0
1697 /*
1698 * In theory, we could have fall-back behavior here.
1699 * It would probably be incorrect.
1700 */
1701#endif
1702 return (error);
1703 }
1704 }
1705
1706 return (0);
1707}
1708
1709void
1710mac_execve_transition(struct ucred *old, struct ucred *new, struct vnode *vp)
1711{
1712 int error;
1713
1714 ASSERT_VOP_LOCKED(vp, "mac_execve_transition");
1715
1716 error = vn_refreshlabel(vp, old);
1717 if (error) {
1718 printf("mac_execve_transition: vn_refreshlabel returned %d\n",
1719 error);
1720 printf("mac_execve_transition: using old vnode label\n");
1721 }
1722
1723 MAC_PERFORM(execve_transition, old, new, vp, &vp->v_label);
1724}
1725
1726int
1727mac_execve_will_transition(struct ucred *old, struct vnode *vp)
1728{
1729 int error, result;
1730
1731 error = vn_refreshlabel(vp, old);
1732 if (error)
1733 return (error);
1734
1735 result = 0;
1736 MAC_BOOLEAN(execve_will_transition, ||, old, vp, &vp->v_label);
1737
1738 return (result);
1739}
1740
1741int
1742mac_check_vnode_access(struct ucred *cred, struct vnode *vp, int flags)
1743{
1744 int error;
1745
1746 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_access");
1747
1748 if (!mac_enforce_fs)
1749 return (0);
1750
1751 error = vn_refreshlabel(vp, cred);
1752 if (error)
1753 return (error);
1754
1755 MAC_CHECK(check_vnode_access, cred, vp, &vp->v_label, flags);
1756 return (error);
1757}
1758
1759int
1760mac_check_vnode_chdir(struct ucred *cred, struct vnode *dvp)
1761{
1762 int error;
1763
1764 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_chdir");
1765
1766 if (!mac_enforce_fs)
1767 return (0);
1768
1769 error = vn_refreshlabel(dvp, cred);
1770 if (error)
1771 return (error);
1772
1773 MAC_CHECK(check_vnode_chdir, cred, dvp, &dvp->v_label);
1774 return (error);
1775}
1776
1777int
1778mac_check_vnode_chroot(struct ucred *cred, struct vnode *dvp)
1779{
1780 int error;
1781
1782 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_chroot");
1783
1784 if (!mac_enforce_fs)
1785 return (0);
1786
1787 error = vn_refreshlabel(dvp, cred);
1788 if (error)
1789 return (error);
1790
1791 MAC_CHECK(check_vnode_chroot, cred, dvp, &dvp->v_label);
1792 return (error);
1793}
1794
1795int
1796mac_check_vnode_create(struct ucred *cred, struct vnode *dvp,
1797 struct componentname *cnp, struct vattr *vap)
1798{
1799 int error;
1800
1801 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_create");
1802
1803 if (!mac_enforce_fs)
1804 return (0);
1805
1806 error = vn_refreshlabel(dvp, cred);
1807 if (error)
1808 return (error);
1809
1810 MAC_CHECK(check_vnode_create, cred, dvp, &dvp->v_label, cnp, vap);
1811 return (error);
1812}
1813
1814int
1815mac_check_vnode_delete(struct ucred *cred, struct vnode *dvp, struct vnode *vp,
1816 struct componentname *cnp)
1817{
1818 int error;
1819
1820 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_delete");
1821 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_delete");
1822
1823 if (!mac_enforce_fs)
1824 return (0);
1825
1826 error = vn_refreshlabel(dvp, cred);
1827 if (error)
1828 return (error);
1829 error = vn_refreshlabel(vp, cred);
1830 if (error)
1831 return (error);
1832
1833 MAC_CHECK(check_vnode_delete, cred, dvp, &dvp->v_label, vp,
1834 &vp->v_label, cnp);
1835 return (error);
1836}
1837
1838int
1839mac_check_vnode_deleteacl(struct ucred *cred, struct vnode *vp,
1840 acl_type_t type)
1841{
1842 int error;
1843
1844 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_deleteacl");
1845
1846 if (!mac_enforce_fs)
1847 return (0);
1848
1849 error = vn_refreshlabel(vp, cred);
1850 if (error)
1851 return (error);
1852
1853 MAC_CHECK(check_vnode_deleteacl, cred, vp, &vp->v_label, type);
1854 return (error);
1855}
1856
1857int
1858mac_check_vnode_exec(struct ucred *cred, struct vnode *vp)
1859{
1860 int error;
1861
1862 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_exec");
1863
1864 if (!mac_enforce_process && !mac_enforce_fs)
1865 return (0);
1866
1867 error = vn_refreshlabel(vp, cred);
1868 if (error)
1869 return (error);
1870 MAC_CHECK(check_vnode_exec, cred, vp, &vp->v_label);
1871
1872 return (error);
1873}
1874
1875int
1876mac_check_vnode_getacl(struct ucred *cred, struct vnode *vp, acl_type_t type)
1877{
1878 int error;
1879
1880 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_getacl");
1881
1882 if (!mac_enforce_fs)
1883 return (0);
1884
1885 error = vn_refreshlabel(vp, cred);
1886 if (error)
1887 return (error);
1888
1889 MAC_CHECK(check_vnode_getacl, cred, vp, &vp->v_label, type);
1890 return (error);
1891}
1892
1893int
1894mac_check_vnode_getextattr(struct ucred *cred, struct vnode *vp,
1895 int attrnamespace, const char *name, struct uio *uio)
1896{
1897 int error;
1898
1899 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_getextattr");
1900
1901 if (!mac_enforce_fs)
1902 return (0);
1903
1904 error = vn_refreshlabel(vp, cred);
1905 if (error)
1906 return (error);
1907
1908 MAC_CHECK(check_vnode_getextattr, cred, vp, &vp->v_label,
1909 attrnamespace, name, uio);
1910 return (error);
1911}
1912
1913int
1914mac_check_vnode_link(struct ucred *cred, struct vnode *dvp,
1915 struct vnode *vp, struct componentname *cnp)
1916{
1917
1918 int error;
1919
1920 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_link");
1921 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_link");
1922
1923 if (!mac_enforce_fs)
1924 return (0);
1925
1926 error = vn_refreshlabel(dvp, cred);
1927 if (error)
1928 return (error);
1929
1930 error = vn_refreshlabel(vp, cred);
1931 if (error)
1932 return (error);
1933
1934 MAC_CHECK(check_vnode_link, cred, dvp, &dvp->v_label, vp,
1935 &vp->v_label, cnp);
1936 return (error);
1937}
1938
1939int
1940mac_check_vnode_lookup(struct ucred *cred, struct vnode *dvp,
1941 struct componentname *cnp)
1942{
1943 int error;
1944
1945 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_lookup");
1946
1947 if (!mac_enforce_fs)
1948 return (0);
1949
1950 error = vn_refreshlabel(dvp, cred);
1951 if (error)
1952 return (error);
1953
1954 MAC_CHECK(check_vnode_lookup, cred, dvp, &dvp->v_label, cnp);
1955 return (error);
1956}
1957
1958int
1959mac_check_vnode_mmap(struct ucred *cred, struct vnode *vp, int prot)
1960{
1961 int error;
1962
1963 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mmap");
1964
1965 if (!mac_enforce_fs || !mac_enforce_vm)
1966 return (0);
1967
1968 error = vn_refreshlabel(vp, cred);
1969 if (error)
1970 return (error);
1971
1972 MAC_CHECK(check_vnode_mmap, cred, vp, &vp->v_label, prot);
1973 return (error);
1974}
1975
1976void
1977mac_check_vnode_mmap_downgrade(struct ucred *cred, struct vnode *vp, int *prot)
1978{
1979 int result = *prot;
1980
1981 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mmap_downgrade");
1982
1983 if (!mac_enforce_fs || !mac_enforce_vm)
1984 return;
1985
1986 MAC_PERFORM(check_vnode_mmap_downgrade, cred, vp, &vp->v_label,
1987 &result);
1988
1989 *prot = result;
1990}
1991
1992int
1993mac_check_vnode_mprotect(struct ucred *cred, struct vnode *vp, int prot)
1994{
1995 int error;
1996
1997 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mprotect");
1998
1999 if (!mac_enforce_fs || !mac_enforce_vm)
2000 return (0);
2001
2002 error = vn_refreshlabel(vp, cred);
2003 if (error)
2004 return (error);
2005
2006 MAC_CHECK(check_vnode_mprotect, cred, vp, &vp->v_label, prot);
2007 return (error);
2008}
2009
2010int
2011mac_check_vnode_open(struct ucred *cred, struct vnode *vp, mode_t acc_mode)
2012{
2013 int error;
2014
2015 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_open");
2016
2017 if (!mac_enforce_fs)
2018 return (0);
2019
2020 error = vn_refreshlabel(vp, cred);
2021 if (error)
2022 return (error);
2023
2024 MAC_CHECK(check_vnode_open, cred, vp, &vp->v_label, acc_mode);
2025 return (error);
2026}
2027
2028int
2029mac_check_vnode_poll(struct ucred *active_cred, struct ucred *file_cred,
2030 struct vnode *vp)
2031{
2032 int error;
2033
2034 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_poll");
2035
2036 if (!mac_enforce_fs)
2037 return (0);
2038
2039 error = vn_refreshlabel(vp, active_cred);
2040 if (error)
2041 return (error);
2042
2043 MAC_CHECK(check_vnode_poll, active_cred, file_cred, vp,
2044 &vp->v_label);
2045
2046 return (error);
2047}
2048
2049int
2050mac_check_vnode_read(struct ucred *active_cred, struct ucred *file_cred,
2051 struct vnode *vp)
2052{
2053 int error;
2054
2055 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_read");
2056
2057 if (!mac_enforce_fs)
2058 return (0);
2059
2060 error = vn_refreshlabel(vp, active_cred);
2061 if (error)
2062 return (error);
2063
2064 MAC_CHECK(check_vnode_read, active_cred, file_cred, vp,
2065 &vp->v_label);
2066
2067 return (error);
2068}
2069
2070int
2071mac_check_vnode_readdir(struct ucred *cred, struct vnode *dvp)
2072{
2073 int error;
2074
2075 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_readdir");
2076
2077 if (!mac_enforce_fs)
2078 return (0);
2079
2080 error = vn_refreshlabel(dvp, cred);
2081 if (error)
2082 return (error);
2083
2084 MAC_CHECK(check_vnode_readdir, cred, dvp, &dvp->v_label);
2085 return (error);
2086}
2087
2088int
2089mac_check_vnode_readlink(struct ucred *cred, struct vnode *vp)
2090{
2091 int error;
2092
2093 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_readlink");
2094
2095 if (!mac_enforce_fs)
2096 return (0);
2097
2098 error = vn_refreshlabel(vp, cred);
2099 if (error)
2100 return (error);
2101
2102 MAC_CHECK(check_vnode_readlink, cred, vp, &vp->v_label);
2103 return (error);
2104}
2105
2106static int
2107mac_check_vnode_relabel(struct ucred *cred, struct vnode *vp,
2108 struct label *newlabel)
2109{
2110 int error;
2111
2112 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_relabel");
2113
2114 error = vn_refreshlabel(vp, cred);
2115 if (error)
2116 return (error);
2117
2118 MAC_CHECK(check_vnode_relabel, cred, vp, &vp->v_label, newlabel);
2119
2120 return (error);
2121}
2122
2123int
2124mac_check_vnode_rename_from(struct ucred *cred, struct vnode *dvp,
2125 struct vnode *vp, struct componentname *cnp)
2126{
2127 int error;
2128
2129 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_rename_from");
2130 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_rename_from");
2131
2132 if (!mac_enforce_fs)
2133 return (0);
2134
2135 error = vn_refreshlabel(dvp, cred);
2136 if (error)
2137 return (error);
2138 error = vn_refreshlabel(vp, cred);
2139 if (error)
2140 return (error);
2141
2142 MAC_CHECK(check_vnode_rename_from, cred, dvp, &dvp->v_label, vp,
2143 &vp->v_label, cnp);
2144 return (error);
2145}
2146
2147int
2148mac_check_vnode_rename_to(struct ucred *cred, struct vnode *dvp,
2149 struct vnode *vp, int samedir, struct componentname *cnp)
2150{
2151 int error;
2152
2153 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_rename_to");
2154 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_rename_to");
2155
2156 if (!mac_enforce_fs)
2157 return (0);
2158
2159 error = vn_refreshlabel(dvp, cred);
2160 if (error)
2161 return (error);
2162 if (vp != NULL) {
2163 error = vn_refreshlabel(vp, cred);
2164 if (error)
2165 return (error);
2166 }
2167 MAC_CHECK(check_vnode_rename_to, cred, dvp, &dvp->v_label, vp,
2168 vp != NULL ? &vp->v_label : NULL, samedir, cnp);
2169 return (error);
2170}
2171
2172int
2173mac_check_vnode_revoke(struct ucred *cred, struct vnode *vp)
2174{
2175 int error;
2176
2177 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_revoke");
2178
2179 if (!mac_enforce_fs)
2180 return (0);
2181
2182 error = vn_refreshlabel(vp, cred);
2183 if (error)
2184 return (error);
2185
2186 MAC_CHECK(check_vnode_revoke, cred, vp, &vp->v_label);
2187 return (error);
2188}
2189
2190int
2191mac_check_vnode_setacl(struct ucred *cred, struct vnode *vp, acl_type_t type,
2192 struct acl *acl)
2193{
2194 int error;
2195
2196 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setacl");
2197
2198 if (!mac_enforce_fs)
2199 return (0);
2200
2201 error = vn_refreshlabel(vp, cred);
2202 if (error)
2203 return (error);
2204
2205 MAC_CHECK(check_vnode_setacl, cred, vp, &vp->v_label, type, acl);
2206 return (error);
2207}
2208
2209int
2210mac_check_vnode_setextattr(struct ucred *cred, struct vnode *vp,
2211 int attrnamespace, const char *name, struct uio *uio)
2212{
2213 int error;
2214
2215 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setextattr");
2216
2217 if (!mac_enforce_fs)
2218 return (0);
2219
2220 error = vn_refreshlabel(vp, cred);
2221 if (error)
2222 return (error);
2223
2224 MAC_CHECK(check_vnode_setextattr, cred, vp, &vp->v_label,
2225 attrnamespace, name, uio);
2226 return (error);
2227}
2228
2229int
2230mac_check_vnode_setflags(struct ucred *cred, struct vnode *vp, u_long flags)
2231{
2232 int error;
2233
2234 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setflags");
2235
2236 if (!mac_enforce_fs)
2237 return (0);
2238
2239 error = vn_refreshlabel(vp, cred);
2240 if (error)
2241 return (error);
2242
2243 MAC_CHECK(check_vnode_setflags, cred, vp, &vp->v_label, flags);
2244 return (error);
2245}
2246
2247int
2248mac_check_vnode_setmode(struct ucred *cred, struct vnode *vp, mode_t mode)
2249{
2250 int error;
2251
2252 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setmode");
2253
2254 if (!mac_enforce_fs)
2255 return (0);
2256
2257 error = vn_refreshlabel(vp, cred);
2258 if (error)
2259 return (error);
2260
2261 MAC_CHECK(check_vnode_setmode, cred, vp, &vp->v_label, mode);
2262 return (error);
2263}
2264
2265int
2266mac_check_vnode_setowner(struct ucred *cred, struct vnode *vp, uid_t uid,
2267 gid_t gid)
2268{
2269 int error;
2270
2271 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setowner");
2272
2273 if (!mac_enforce_fs)
2274 return (0);
2275
2276 error = vn_refreshlabel(vp, cred);
2277 if (error)
2278 return (error);
2279
2280 MAC_CHECK(check_vnode_setowner, cred, vp, &vp->v_label, uid, gid);
2281 return (error);
2282}
2283
2284int
2285mac_check_vnode_setutimes(struct ucred *cred, struct vnode *vp,
2286 struct timespec atime, struct timespec mtime)
2287{
2288 int error;
2289
2290 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setutimes");
2291
2292 if (!mac_enforce_fs)
2293 return (0);
2294
2295 error = vn_refreshlabel(vp, cred);
2296 if (error)
2297 return (error);
2298
2299 MAC_CHECK(check_vnode_setutimes, cred, vp, &vp->v_label, atime,
2300 mtime);
2301 return (error);
2302}
2303
2304int
2305mac_check_vnode_stat(struct ucred *active_cred, struct ucred *file_cred,
2306 struct vnode *vp)
2307{
2308 int error;
2309
2310 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_stat");
2311
2312 if (!mac_enforce_fs)
2313 return (0);
2314
2315 error = vn_refreshlabel(vp, active_cred);
2316 if (error)
2317 return (error);
2318
2319 MAC_CHECK(check_vnode_stat, active_cred, file_cred, vp,
2320 &vp->v_label);
2321 return (error);
2322}
2323
2324int
2325mac_check_vnode_write(struct ucred *active_cred, struct ucred *file_cred,
2326 struct vnode *vp)
2327{
2328 int error;
2329
2330 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_write");
2331
2332 if (!mac_enforce_fs)
2333 return (0);
2334
2335 error = vn_refreshlabel(vp, active_cred);
2336 if (error)
2337 return (error);
2338
2339 MAC_CHECK(check_vnode_write, active_cred, file_cred, vp,
2340 &vp->v_label);
2341
2342 return (error);
2343}
2344
2345/*
2346 * When relabeling a process, call out to the policies for the maximum
2347 * permission allowed for each object type we know about in its
2348 * memory space, and revoke access (in the least surprising ways we
2349 * know) when necessary. The process lock is not held here.
2350 */
2351static void
2352mac_cred_mmapped_drop_perms(struct thread *td, struct ucred *cred)
2353{
2354
2355 /* XXX freeze all other threads */
2356 mac_cred_mmapped_drop_perms_recurse(td, cred,
2357 &td->td_proc->p_vmspace->vm_map);
2358 /* XXX allow other threads to continue */
2359}
2360
2361static __inline const char *
2362prot2str(vm_prot_t prot)
2363{
2364
2365 switch (prot & VM_PROT_ALL) {
2366 case VM_PROT_READ:
2367 return ("r--");
2368 case VM_PROT_READ | VM_PROT_WRITE:
2369 return ("rw-");
2370 case VM_PROT_READ | VM_PROT_EXECUTE:
2371 return ("r-x");
2372 case VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE:
2373 return ("rwx");
2374 case VM_PROT_WRITE:
2375 return ("-w-");
2376 case VM_PROT_EXECUTE:
2377 return ("--x");
2378 case VM_PROT_WRITE | VM_PROT_EXECUTE:
2379 return ("-wx");
2380 default:
2381 return ("---");
2382 }
2383}
2384
2385static void
2386mac_cred_mmapped_drop_perms_recurse(struct thread *td, struct ucred *cred,
2387 struct vm_map *map)
2388{
2389 struct vm_map_entry *vme;
2390 int result;
2391 vm_prot_t revokeperms;
2392 vm_object_t object;
2393 vm_ooffset_t offset;
2394 struct vnode *vp;
2395
2396 if (!mac_mmap_revocation)
2397 return;
2398
2399 vm_map_lock_read(map);
2400 for (vme = map->header.next; vme != &map->header; vme = vme->next) {
2401 if (vme->eflags & MAP_ENTRY_IS_SUB_MAP) {
2402 mac_cred_mmapped_drop_perms_recurse(td, cred,
2403 vme->object.sub_map);
2404 continue;
2405 }
2406 /*
2407 * Skip over entries that obviously are not shared.
2408 */
2409 if (vme->eflags & (MAP_ENTRY_COW | MAP_ENTRY_NOSYNC) ||
2410 !vme->max_protection)
2411 continue;
2412 /*
2413 * Drill down to the deepest backing object.
2414 */
2415 offset = vme->offset;
2416 object = vme->object.vm_object;
2417 if (object == NULL)
2418 continue;
2419 while (object->backing_object != NULL) {
2420 object = object->backing_object;
2421 offset += object->backing_object_offset;
2422 }
2423 /*
2424 * At the moment, vm_maps and objects aren't considered
2425 * by the MAC system, so only things with backing by a
2426 * normal object (read: vnodes) are checked.
2427 */
2428 if (object->type != OBJT_VNODE)
2429 continue;
2430 vp = (struct vnode *)object->handle;
2431 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
2432 result = vme->max_protection;
2433 mac_check_vnode_mmap_downgrade(cred, vp, &result);
2434 VOP_UNLOCK(vp, 0, td);
2435 /*
2436 * Find out what maximum protection we may be allowing
2437 * now but a policy needs to get removed.
2438 */
2439 revokeperms = vme->max_protection & ~result;
2440 if (!revokeperms)
2441 continue;
2442 printf("pid %ld: revoking %s perms from %#lx:%ld "
2443 "(max %s/cur %s)\n", (long)td->td_proc->p_pid,
2444 prot2str(revokeperms), (u_long)vme->start,
2445 (long)(vme->end - vme->start),
2446 prot2str(vme->max_protection), prot2str(vme->protection));
2447 vm_map_lock_upgrade(map);
2448 /*
2449 * This is the really simple case: if a map has more
2450 * max_protection than is allowed, but it's not being
2451 * actually used (that is, the current protection is
2452 * still allowed), we can just wipe it out and do
2453 * nothing more.
2454 */
2455 if ((vme->protection & revokeperms) == 0) {
2456 vme->max_protection -= revokeperms;
2457 } else {
2458 if (revokeperms & VM_PROT_WRITE) {
2459 /*
2460 * In the more complicated case, flush out all
2461 * pending changes to the object then turn it
2462 * copy-on-write.
2463 */
2464 vm_object_reference(object);
2465 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
2466 vm_object_page_clean(object,
2467 OFF_TO_IDX(offset),
2468 OFF_TO_IDX(offset + vme->end - vme->start +
2469 PAGE_MASK),
2470 OBJPC_SYNC);
2471 VOP_UNLOCK(vp, 0, td);
2472 vm_object_deallocate(object);
2473 /*
2474 * Why bother if there's no read permissions
2475 * anymore? For the rest, we need to leave
2476 * the write permissions on for COW, or
2477 * remove them entirely if configured to.
2478 */
2479 if (!mac_mmap_revocation_via_cow) {
2480 vme->max_protection &= ~VM_PROT_WRITE;
2481 vme->protection &= ~VM_PROT_WRITE;
2482 } if ((revokeperms & VM_PROT_READ) == 0)
2483 vme->eflags |= MAP_ENTRY_COW |
2484 MAP_ENTRY_NEEDS_COPY;
2485 }
2486 if (revokeperms & VM_PROT_EXECUTE) {
2487 vme->max_protection &= ~VM_PROT_EXECUTE;
2488 vme->protection &= ~VM_PROT_EXECUTE;
2489 }
2490 if (revokeperms & VM_PROT_READ) {
2491 vme->max_protection = 0;
2492 vme->protection = 0;
2493 }
2494 pmap_protect(map->pmap, vme->start, vme->end,
2495 vme->protection & ~revokeperms);
2496 vm_map_simplify_entry(map, vme);
2497 }
2498 vm_map_lock_downgrade(map);
2499 }
2500 vm_map_unlock_read(map);
2501}
2502
2503/*
2504 * When the subject's label changes, it may require revocation of privilege
2505 * to mapped objects. This can't be done on-the-fly later with a unified
2506 * buffer cache.
2507 */
2508static void
2509mac_relabel_cred(struct ucred *cred, struct label *newlabel)
2510{
2511
2512 MAC_PERFORM(relabel_cred, cred, newlabel);
2513}
2514
2515void
2516mac_relabel_vnode(struct ucred *cred, struct vnode *vp, struct label *newlabel)
2517{
2518
2519 MAC_PERFORM(relabel_vnode, cred, vp, &vp->v_label, newlabel);
2520}
2521
2522void
2523mac_create_ifnet(struct ifnet *ifnet)
2524{
2525
2526 MAC_PERFORM(create_ifnet, ifnet, &ifnet->if_label);
2527}
2528
2529void
2530mac_create_bpfdesc(struct ucred *cred, struct bpf_d *bpf_d)
2531{
2532
2533 MAC_PERFORM(create_bpfdesc, cred, bpf_d, &bpf_d->bd_label);
2534}
2535
2536void
2537mac_create_socket(struct ucred *cred, struct socket *socket)
2538{
2539
2540 MAC_PERFORM(create_socket, cred, socket, &socket->so_label);
2541}
2542
2543void
2544mac_create_pipe(struct ucred *cred, struct pipe *pipe)
2545{
2546
2547 MAC_PERFORM(create_pipe, cred, pipe, pipe->pipe_label);
2548}
2549
2550void
2551mac_create_socket_from_socket(struct socket *oldsocket,
2552 struct socket *newsocket)
2553{
2554
2555 MAC_PERFORM(create_socket_from_socket, oldsocket, &oldsocket->so_label,
2556 newsocket, &newsocket->so_label);
2557}
2558
2559static void
2560mac_relabel_socket(struct ucred *cred, struct socket *socket,
2561 struct label *newlabel)
2562{
2563
2564 MAC_PERFORM(relabel_socket, cred, socket, &socket->so_label, newlabel);
2565}
2566
2567static void
2568mac_relabel_pipe(struct ucred *cred, struct pipe *pipe, struct label *newlabel)
2569{
2570
2571 MAC_PERFORM(relabel_pipe, cred, pipe, pipe->pipe_label, newlabel);
2572}
2573
2574void
2575mac_set_socket_peer_from_mbuf(struct mbuf *mbuf, struct socket *socket)
2576{
2577
2578 MAC_PERFORM(set_socket_peer_from_mbuf, mbuf, &mbuf->m_pkthdr.label,
2579 socket, &socket->so_peerlabel);
2580}
2581
2582void
2583mac_set_socket_peer_from_socket(struct socket *oldsocket,
2584 struct socket *newsocket)
2585{
2586
2587 MAC_PERFORM(set_socket_peer_from_socket, oldsocket,
2588 &oldsocket->so_label, newsocket, &newsocket->so_peerlabel);
2589}
2590
2591void
2592mac_create_datagram_from_ipq(struct ipq *ipq, struct mbuf *datagram)
2593{
2594
2595 MAC_PERFORM(create_datagram_from_ipq, ipq, &ipq->ipq_label,
2596 datagram, &datagram->m_pkthdr.label);
2597}
2598
2599void
2600mac_create_fragment(struct mbuf *datagram, struct mbuf *fragment)
2601{
2602
2603 MAC_PERFORM(create_fragment, datagram, &datagram->m_pkthdr.label,
2604 fragment, &fragment->m_pkthdr.label);
2605}
2606
2607void
2608mac_create_ipq(struct mbuf *fragment, struct ipq *ipq)
2609{
2610
2611 MAC_PERFORM(create_ipq, fragment, &fragment->m_pkthdr.label, ipq,
2612 &ipq->ipq_label);
2613}
2614
2615void
2616mac_create_mbuf_from_mbuf(struct mbuf *oldmbuf, struct mbuf *newmbuf)
2617{
2618
2619 MAC_PERFORM(create_mbuf_from_mbuf, oldmbuf, &oldmbuf->m_pkthdr.label,
2620 newmbuf, &newmbuf->m_pkthdr.label);
2621}
2622
2623void
2624mac_create_mbuf_from_bpfdesc(struct bpf_d *bpf_d, struct mbuf *mbuf)
2625{
2626
2627 MAC_PERFORM(create_mbuf_from_bpfdesc, bpf_d, &bpf_d->bd_label, mbuf,
2628 &mbuf->m_pkthdr.label);
2629}
2630
2631void
2632mac_create_mbuf_linklayer(struct ifnet *ifnet, struct mbuf *mbuf)
2633{
2634
2635 MAC_PERFORM(create_mbuf_linklayer, ifnet, &ifnet->if_label, mbuf,
2636 &mbuf->m_pkthdr.label);
2637}
2638
2639void
2640mac_create_mbuf_from_ifnet(struct ifnet *ifnet, struct mbuf *mbuf)
2641{
2642
2643 MAC_PERFORM(create_mbuf_from_ifnet, ifnet, &ifnet->if_label, mbuf,
2644 &mbuf->m_pkthdr.label);
2645}
2646
2647void
2648mac_create_mbuf_multicast_encap(struct mbuf *oldmbuf, struct ifnet *ifnet,
2649 struct mbuf *newmbuf)
2650{
2651
2652 MAC_PERFORM(create_mbuf_multicast_encap, oldmbuf,
2653 &oldmbuf->m_pkthdr.label, ifnet, &ifnet->if_label, newmbuf,
2654 &newmbuf->m_pkthdr.label);
2655}
2656
2657void
2658mac_create_mbuf_netlayer(struct mbuf *oldmbuf, struct mbuf *newmbuf)
2659{
2660
2661 MAC_PERFORM(create_mbuf_netlayer, oldmbuf, &oldmbuf->m_pkthdr.label,
2662 newmbuf, &newmbuf->m_pkthdr.label);
2663}
2664
2665int
2666mac_fragment_match(struct mbuf *fragment, struct ipq *ipq)
2667{
2668 int result;
2669
2670 result = 1;
2671 MAC_BOOLEAN(fragment_match, &&, fragment, &fragment->m_pkthdr.label,
2672 ipq, &ipq->ipq_label);
2673
2674 return (result);
2675}
2676
2677void
2678mac_update_ipq(struct mbuf *fragment, struct ipq *ipq)
2679{
2680
2681 MAC_PERFORM(update_ipq, fragment, &fragment->m_pkthdr.label, ipq,
2682 &ipq->ipq_label);
2683}
2684
2685void
2686mac_create_mbuf_from_socket(struct socket *socket, struct mbuf *mbuf)
2687{
2688
2689 MAC_PERFORM(create_mbuf_from_socket, socket, &socket->so_label, mbuf,
2690 &mbuf->m_pkthdr.label);
2691}
2692
2693void
2694mac_create_mount(struct ucred *cred, struct mount *mp)
2695{
2696
2697 MAC_PERFORM(create_mount, cred, mp, &mp->mnt_mntlabel,
2698 &mp->mnt_fslabel);
2699}
2700
2701void
2702mac_create_root_mount(struct ucred *cred, struct mount *mp)
2703{
2704
2705 MAC_PERFORM(create_root_mount, cred, mp, &mp->mnt_mntlabel,
2706 &mp->mnt_fslabel);
2707}
2708
2709int
2710mac_check_bpfdesc_receive(struct bpf_d *bpf_d, struct ifnet *ifnet)
2711{
2712 int error;
2713
2714 if (!mac_enforce_network)
2715 return (0);
2716
2717 MAC_CHECK(check_bpfdesc_receive, bpf_d, &bpf_d->bd_label, ifnet,
2718 &ifnet->if_label);
2719
2720 return (error);
2721}
2722
2723static int
2724mac_check_cred_relabel(struct ucred *cred, struct label *newlabel)
2725{
2726 int error;
2727
2728 MAC_CHECK(check_cred_relabel, cred, newlabel);
2729
2730 return (error);
2731}
2732
2733int
2734mac_check_cred_visible(struct ucred *u1, struct ucred *u2)
2735{
2736 int error;
2737
2738 if (!mac_enforce_process)
2739 return (0);
2740
2741 MAC_CHECK(check_cred_visible, u1, u2);
2742
2743 return (error);
2744}
2745
2746int
2747mac_check_ifnet_transmit(struct ifnet *ifnet, struct mbuf *mbuf)
2748{
2749 int error;
2750
2751 if (!mac_enforce_network)
2752 return (0);
2753
2754 KASSERT(mbuf->m_flags & M_PKTHDR, ("packet has no pkthdr"));
2755 if (!(mbuf->m_pkthdr.label.l_flags & MAC_FLAG_INITIALIZED))
2756 printf("%s%d: not initialized\n", ifnet->if_name,
2757 ifnet->if_unit);
2758
2759 MAC_CHECK(check_ifnet_transmit, ifnet, &ifnet->if_label, mbuf,
2760 &mbuf->m_pkthdr.label);
2761
2762 return (error);
2763}
2764
2765int
2766mac_check_mount_stat(struct ucred *cred, struct mount *mount)
2767{
2768 int error;
2769
2770 if (!mac_enforce_fs)
2771 return (0);
2772
2773 MAC_CHECK(check_mount_stat, cred, mount, &mount->mnt_mntlabel);
2774
2775 return (error);
2776}
2777
2778int
2779mac_check_pipe_ioctl(struct ucred *cred, struct pipe *pipe, unsigned long cmd,
2780 void *data)
2781{
2782 int error;
2783
2784 PIPE_LOCK_ASSERT(pipe, MA_OWNED);
2785
2786 if (!mac_enforce_pipe)
2787 return (0);
2788
2789 MAC_CHECK(check_pipe_ioctl, cred, pipe, pipe->pipe_label, cmd, data);
2790
2791 return (error);
2792}
2793
2794int
2795mac_check_pipe_poll(struct ucred *cred, struct pipe *pipe)
2796{
2797 int error;
2798
2799 PIPE_LOCK_ASSERT(pipe, MA_OWNED);
2800
2801 if (!mac_enforce_pipe)
2802 return (0);
2803
2804 MAC_CHECK(check_pipe_poll, cred, pipe, pipe->pipe_label);
2805
2806 return (error);
2807}
2808
2809int
2810mac_check_pipe_read(struct ucred *cred, struct pipe *pipe)
2811{
2812 int error;
2813
2814 PIPE_LOCK_ASSERT(pipe, MA_OWNED);
2815
2816 if (!mac_enforce_pipe)
2817 return (0);
2818
2819 MAC_CHECK(check_pipe_read, cred, pipe, pipe->pipe_label);
2820
2821 return (error);
2822}
2823
2824static int
2825mac_check_pipe_relabel(struct ucred *cred, struct pipe *pipe,
2826 struct label *newlabel)
2827{
2828 int error;
2829
2830 PIPE_LOCK_ASSERT(pipe, MA_OWNED);
2831
2832 if (!mac_enforce_pipe)
2833 return (0);
2834
2835 MAC_CHECK(check_pipe_relabel, cred, pipe, pipe->pipe_label, newlabel);
2836
2837 return (error);
2838}
2839
2840int
2841mac_check_pipe_stat(struct ucred *cred, struct pipe *pipe)
2842{
2843 int error;
2844
2845 PIPE_LOCK_ASSERT(pipe, MA_OWNED);
2846
2847 if (!mac_enforce_pipe)
2848 return (0);
2849
2850 MAC_CHECK(check_pipe_stat, cred, pipe, pipe->pipe_label);
2851
2852 return (error);
2853}
2854
2855int
2856mac_check_pipe_write(struct ucred *cred, struct pipe *pipe)
2857{
2858 int error;
2859
2860 PIPE_LOCK_ASSERT(pipe, MA_OWNED);
2861
2862 if (!mac_enforce_pipe)
2863 return (0);
2864
2865 MAC_CHECK(check_pipe_write, cred, pipe, pipe->pipe_label);
2866
2867 return (error);
2868}
2869
2870int
2871mac_check_proc_debug(struct ucred *cred, struct proc *proc)
2872{
2873 int error;
2874
2875 PROC_LOCK_ASSERT(proc, MA_OWNED);
2876
2877 if (!mac_enforce_process)
2878 return (0);
2879
2880 MAC_CHECK(check_proc_debug, cred, proc);
2881
2882 return (error);
2883}
2884
2885int
2886mac_check_proc_sched(struct ucred *cred, struct proc *proc)
2887{
2888 int error;
2889
2890 PROC_LOCK_ASSERT(proc, MA_OWNED);
2891
2892 if (!mac_enforce_process)
2893 return (0);
2894
2895 MAC_CHECK(check_proc_sched, cred, proc);
2896
2897 return (error);
2898}
2899
2900int
2901mac_check_proc_signal(struct ucred *cred, struct proc *proc, int signum)
2902{
2903 int error;
2904
2905 PROC_LOCK_ASSERT(proc, MA_OWNED);
2906
2907 if (!mac_enforce_process)
2908 return (0);
2909
2910 MAC_CHECK(check_proc_signal, cred, proc, signum);
2911
2912 return (error);
2913}
2914
2915int
2916mac_check_socket_bind(struct ucred *ucred, struct socket *socket,
2917 struct sockaddr *sockaddr)
2918{
2919 int error;
2920
2921 if (!mac_enforce_socket)
2922 return (0);
2923
2924 MAC_CHECK(check_socket_bind, ucred, socket, &socket->so_label,
2925 sockaddr);
2926
2927 return (error);
2928}
2929
2930int
2931mac_check_socket_connect(struct ucred *cred, struct socket *socket,
2932 struct sockaddr *sockaddr)
2933{
2934 int error;
2935
2936 if (!mac_enforce_socket)
2937 return (0);
2938
2939 MAC_CHECK(check_socket_connect, cred, socket, &socket->so_label,
2940 sockaddr);
2941
2942 return (error);
2943}
2944
2945int
2946mac_check_socket_deliver(struct socket *socket, struct mbuf *mbuf)
2947{
2948 int error;
2949
2950 if (!mac_enforce_socket)
2951 return (0);
2952
2953 MAC_CHECK(check_socket_deliver, socket, &socket->so_label, mbuf,
2954 &mbuf->m_pkthdr.label);
2955
2956 return (error);
2957}
2958
2959int
2960mac_check_socket_listen(struct ucred *cred, struct socket *socket)
2961{
2962 int error;
2963
2964 if (!mac_enforce_socket)
2965 return (0);
2966
2967 MAC_CHECK(check_socket_listen, cred, socket, &socket->so_label);
2968 return (error);
2969}
2970
2971int
2972mac_check_socket_receive(struct ucred *cred, struct socket *so)
2973{
2974 int error;
2975
2976 if (!mac_enforce_socket)
2977 return (0);
2978
2979 MAC_CHECK(check_socket_receive, cred, so, &so->so_label);
2980
2981 return (error);
2982}
2983
2984static int
2985mac_check_socket_relabel(struct ucred *cred, struct socket *socket,
2986 struct label *newlabel)
2987{
2988 int error;
2989
2990 MAC_CHECK(check_socket_relabel, cred, socket, &socket->so_label,
2991 newlabel);
2992
2993 return (error);
2994}
2995
2996int
2997mac_check_socket_send(struct ucred *cred, struct socket *so)
2998{
2999 int error;
3000
3001 if (!mac_enforce_socket)
3002 return (0);
3003
3004 MAC_CHECK(check_socket_send, cred, so, &so->so_label);
3005
3006 return (error);
3007}
3008
3009int
3010mac_check_socket_visible(struct ucred *cred, struct socket *socket)
3011{
3012 int error;
3013
3014 if (!mac_enforce_socket)
3015 return (0);
3016
3017 MAC_CHECK(check_socket_visible, cred, socket, &socket->so_label);
3018
3019 return (error);
3020}
3021
3022int
3023mac_ioctl_ifnet_get(struct ucred *cred, struct ifreq *ifr,
3024 struct ifnet *ifnet)
3025{
3026 struct mac label;
3027 int error;
3028
3029 error = mac_externalize(&ifnet->if_label, &label);
3030 if (error)
3031 return (error);
3032
3033 return (copyout(&label, ifr->ifr_ifru.ifru_data, sizeof(label)));
3034}
3035
3036int
3037mac_ioctl_ifnet_set(struct ucred *cred, struct ifreq *ifr,
3038 struct ifnet *ifnet)
3039{
3040 struct mac newlabel;
3041 struct label intlabel;
3042 int error;
3043
3044 error = copyin(ifr->ifr_ifru.ifru_data, &newlabel, sizeof(newlabel));
3045 if (error)
3046 return (error);
3047
3048 error = mac_internalize(&intlabel, &newlabel);
3049 if (error)
3050 return (error);
3051
3052 /*
3053 * XXX: Note that this is a redundant privilege check, since
3054 * policies impose this check themselves if required by the
3055 * policy. Eventually, this should go away.
3056 */
3057 error = suser_cred(cred, 0);
3058 if (error)
3059 goto out;
3060
3061 MAC_CHECK(check_ifnet_relabel, cred, ifnet, &ifnet->if_label,
3062 &intlabel);
3063 if (error)
3064 goto out;
3065
3066 MAC_PERFORM(relabel_ifnet, cred, ifnet, &ifnet->if_label, &intlabel);
3067
3068out:
3069 mac_destroy_temp(&intlabel);
3070 return (error);
3071}
3072
3073void
3074mac_create_devfs_vnode(struct devfs_dirent *de, struct vnode *vp)
3075{
3076
3077 MAC_PERFORM(create_devfs_vnode, de, &de->de_label, vp, &vp->v_label);
3078}
3079
3080void
3081mac_create_devfs_device(dev_t dev, struct devfs_dirent *de)
3082{
3083
3084 MAC_PERFORM(create_devfs_device, dev, de, &de->de_label);
3085}
3086
3087void
3088mac_create_devfs_symlink(struct ucred *cred, struct devfs_dirent *dd,
3089 struct devfs_dirent *de)
3090{
3091
3092 MAC_PERFORM(create_devfs_symlink, cred, dd, &dd->de_label, de,
3093 &de->de_label);
3094}
3095
3096static int
3097mac_stdcreatevnode_ea(struct vnode *vp)
3098{
3099 int error;
3100
3101 MAC_CHECK(stdcreatevnode_ea, vp, &vp->v_label);
3102
3103 return (error);
3104}
3105
3106void
3107mac_create_devfs_directory(char *dirname, int dirnamelen,
3108 struct devfs_dirent *de)
3109{
3110
3111 MAC_PERFORM(create_devfs_directory, dirname, dirnamelen, de,
3112 &de->de_label);
3113}
3114
3115/*
3116 * When a new vnode is created, this call will initialize its label.
3117 */
3118void
3119mac_create_vnode(struct ucred *cred, struct vnode *parent,
3120 struct vnode *child)
3121{
3122 int error;
3123
3124 ASSERT_VOP_LOCKED(parent, "mac_create_vnode");
3125 ASSERT_VOP_LOCKED(child, "mac_create_vnode");
3126
3127 error = vn_refreshlabel(parent, cred);
3128 if (error) {
3129 printf("mac_create_vnode: vn_refreshlabel returned %d\n",
3130 error);
3131 printf("mac_create_vnode: using old vnode label\n");
3132 }
3133
3134 MAC_PERFORM(create_vnode, cred, parent, &parent->v_label, child,
3135 &child->v_label);
3136}
3137
3138int
3139mac_setsockopt_label_set(struct ucred *cred, struct socket *so,
3140 struct mac *extmac)
3141{
3142 struct label intlabel;
3143 int error;
3144
3145 error = mac_internalize(&intlabel, extmac);
3146 if (error)
3147 return (error);
3148
3149 mac_check_socket_relabel(cred, so, &intlabel);
3150 if (error) {
3151 mac_destroy_temp(&intlabel);
3152 return (error);
3153 }
3154
3155 mac_relabel_socket(cred, so, &intlabel);
3156
3157 mac_destroy_temp(&intlabel);
3158 return (0);
3159}
3160
3161int
3162mac_pipe_label_set(struct ucred *cred, struct pipe *pipe, struct label *label)
3163{
3164 int error;
3165
3166 PIPE_LOCK_ASSERT(pipe, MA_OWNED);
3167
3168 error = mac_check_pipe_relabel(cred, pipe, label);
3169 if (error)
3170 return (error);
3171
3172 mac_relabel_pipe(cred, pipe, label);
3173
3174 return (0);
3175}
3176
3177int
3178mac_getsockopt_label_get(struct ucred *cred, struct socket *so,
3179 struct mac *extmac)
3180{
3181
3182 return (mac_externalize(&so->so_label, extmac));
3183}
3184
3185int
3186mac_getsockopt_peerlabel_get(struct ucred *cred, struct socket *so,
3187 struct mac *extmac)
3188{
3189
3190 return (mac_externalize(&so->so_peerlabel, extmac));
3191}
3192
3193/*
3194 * Implementation of VOP_SETLABEL() that relies on extended attributes
3195 * to store label data. Can be referenced by filesystems supporting
3196 * extended attributes.
3197 */
3198int
3199vop_stdsetlabel_ea(struct vop_setlabel_args *ap)
3200{
3201 struct vnode *vp = ap->a_vp;
3202 struct label *intlabel = ap->a_label;
3203 struct mac extmac;
3204 int error;
3205
3206 ASSERT_VOP_LOCKED(vp, "vop_stdsetlabel_ea");
3207
3208 /*
3209 * XXX: Eventually call out to EA check/set calls here.
3210 * Be particularly careful to avoid race conditions,
3211 * consistency problems, and stability problems when
3212 * dealing with multiple EAs. In particular, we require
3213 * the ability to write multiple EAs on the same file in
3214 * a single transaction, which the current EA interface
3215 * does not provide.
3216 */
3217
3218 error = mac_externalize(intlabel, &extmac);
3219 if (error)
3220 return (error);
3221
3222 error = vn_extattr_set(vp, IO_NODELOCKED,
3223 FREEBSD_MAC_EXTATTR_NAMESPACE, FREEBSD_MAC_EXTATTR_NAME,
3224 sizeof(extmac), (char *)&extmac, curthread);
3225 if (error)
3226 return (error);
3227
3228 mac_relabel_vnode(ap->a_cred, vp, intlabel);
3229
3230 vp->v_vflag |= VV_CACHEDLABEL;
3231
3232 return (0);
3233}
3234
3235static int
3236vn_setlabel(struct vnode *vp, struct label *intlabel, struct ucred *cred)
3237{
3238 int error;
3239
3240 if (vp->v_mount == NULL) {
3241 /* printf("vn_setlabel: null v_mount\n"); */
3242 if (vp->v_type != VNON)
3243 printf("vn_setlabel: null v_mount with non-VNON\n");
3244 return (EBADF);
3245 }
3246
3247 if ((vp->v_mount->mnt_flag & MNT_MULTILABEL) == 0)
3248 return (EOPNOTSUPP);
3249
3250 /*
3251 * Multi-phase commit. First check the policies to confirm the
3252 * change is OK. Then commit via the filesystem. Finally,
3253 * update the actual vnode label. Question: maybe the filesystem
3254 * should update the vnode at the end as part of VOP_SETLABEL()?
3255 */
3256 error = mac_check_vnode_relabel(cred, vp, intlabel);
3257 if (error)
3258 return (error);
3259
3260 /*
3261 * VADMIN provides the opportunity for the filesystem to make
3262 * decisions about who is and is not able to modify labels
3263 * and protections on files. This might not be right. We can't
3264 * assume VOP_SETLABEL() will do it, because we might implement
3265 * that as part of vop_stdsetlabel_ea().
3266 */
3267 error = VOP_ACCESS(vp, VADMIN, cred, curthread);
3268 if (error)
3269 return (error);
3270
3271 error = VOP_SETLABEL(vp, intlabel, cred, curthread);
3272 if (error)
3273 return (error);
3274
3275 return (0);
3276}
3277
3278/*
3279 * MPSAFE
3280 */
3281int
3282__mac_get_proc(struct thread *td, struct __mac_get_proc_args *uap)
3283{
3284 struct mac extmac;
3285 int error;
3286
3287 error = mac_externalize(&td->td_ucred->cr_label, &extmac);
3288 if (error == 0)
3289 error = copyout(&extmac, SCARG(uap, mac_p), sizeof(extmac));
3290
3291 return (error);
3292}
3293
3294/*
3295 * MPSAFE
3296 */
3297int
3298__mac_set_proc(struct thread *td, struct __mac_set_proc_args *uap)
3299{
3300 struct ucred *newcred, *oldcred;
3301 struct proc *p;
3302 struct mac extmac;
3303 struct label intlabel;
3304 int error;
3305
3306 error = copyin(SCARG(uap, mac_p), &extmac, sizeof(extmac));
3307 if (error)
3308 return (error);
3309
3310 error = mac_internalize(&intlabel, &extmac);
3311 if (error)
3312 return (error);
3313
3314 newcred = crget();
3315
3316 p = td->td_proc;
3317 PROC_LOCK(p);
3318 oldcred = p->p_ucred;
3319
3320 error = mac_check_cred_relabel(oldcred, &intlabel);
3321 if (error) {
3322 PROC_UNLOCK(p);
3323 mac_destroy_temp(&intlabel);
3324 crfree(newcred);
3325 return (error);
3326 }
3327
3328 setsugid(p);
3329 crcopy(newcred, oldcred);
3330 mac_relabel_cred(newcred, &intlabel);
3331 p->p_ucred = newcred;
3332
3333 /*
3334 * Grab additional reference for use while revoking mmaps, prior
3335 * to releasing the proc lock and sharing the cred.
3336 */
3337 crhold(newcred);
3338 PROC_UNLOCK(p);
3339
3340 mtx_lock(&Giant);
3341 mac_cred_mmapped_drop_perms(td, newcred);
3342 mtx_unlock(&Giant);
3343
3344 crfree(newcred); /* Free revocation reference. */
3345 crfree(oldcred);
3346 mac_destroy_temp(&intlabel);
3347 return (0);
3348}
3349
3350/*
3351 * MPSAFE
3352 */
3353int
3354__mac_get_fd(struct thread *td, struct __mac_get_fd_args *uap)
3355{
3356 struct file *fp;
3357 struct mac extmac;
3358 struct vnode *vp;
3359 struct pipe *pipe;
3360 int error;
3361
3362 mtx_lock(&Giant);
3363
3364 error = fget(td, SCARG(uap, fd), &fp);
3365 if (error)
3366 goto out;
3367
3368 switch (fp->f_type) {
3369 case DTYPE_FIFO:
3370 case DTYPE_VNODE:
3371 vp = (struct vnode *)fp->f_data;
3372
3373 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
3374 error = vn_refreshlabel(vp, td->td_ucred);
3375 if (error == 0)
3376 error = mac_externalize(&vp->v_label, &extmac);
3377 VOP_UNLOCK(vp, 0, td);
3378 break;
3379 case DTYPE_PIPE:
3380 pipe = (struct pipe *)fp->f_data;
3381 error = mac_externalize(pipe->pipe_label, &extmac);
3382 break;
3383 default:
3384 error = EINVAL;
3385 }
3386
3387 if (error == 0)
3388 error = copyout(&extmac, SCARG(uap, mac_p), sizeof(extmac));
3389
3390 fdrop(fp, td);
3391
3392out:
3393 mtx_unlock(&Giant);
3394 return (error);
3395}
3396
3397/*
3398 * MPSAFE
3399 */
3400int
3401__mac_get_file(struct thread *td, struct __mac_get_file_args *uap)
3402{
3403 struct nameidata nd;
3404 struct mac extmac;
3405 int error;
3406
3407 mtx_lock(&Giant);
3408 NDINIT(&nd, LOOKUP, LOCKLEAF | FOLLOW, UIO_USERSPACE,
3409 SCARG(uap, path_p), td);
3410 error = namei(&nd);
3411 if (error)
3412 goto out;
3413
3414 error = vn_refreshlabel(nd.ni_vp, td->td_ucred);
3415 if (error == 0)
3416 error = mac_externalize(&nd.ni_vp->v_label, &extmac);
3417 NDFREE(&nd, 0);
3418 if (error)
3419 goto out;
3420
3421 error = copyout(&extmac, SCARG(uap, mac_p), sizeof(extmac));
3422
3423out:
3424 mtx_unlock(&Giant);
3425 return (error);
3426}
3427
3428/*
3429 * MPSAFE
3430 */
3431int
3432__mac_set_fd(struct thread *td, struct __mac_set_fd_args *uap)
3433{
3434 struct file *fp;
3435 struct mac extmac;
3436 struct label intlabel;
3437 struct mount *mp;
3438 struct vnode *vp;
3439 struct pipe *pipe;
3440 int error;
3441
3442 mtx_lock(&Giant);
3443 error = fget(td, SCARG(uap, fd), &fp);
3444 if (error)
3445 goto out1;
3446
3447 error = copyin(SCARG(uap, mac_p), &extmac, sizeof(extmac));
3448 if (error)
3449 goto out2;
3450
3451 error = mac_internalize(&intlabel, &extmac);
3452 if (error)
3453 goto out2;
3454
3455 switch (fp->f_type) {
3456 case DTYPE_FIFO:
3457 case DTYPE_VNODE:
3458 vp = (struct vnode *)fp->f_data;
3459 error = vn_start_write(vp, &mp, V_WAIT | PCATCH);
3460 if (error != 0)
3461 break;
3462
3463 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
3464 error = vn_setlabel(vp, &intlabel, td->td_ucred);
3465 VOP_UNLOCK(vp, 0, td);
3466 vn_finished_write(mp);
3467 mac_destroy_temp(&intlabel);
3468 break;
3469 case DTYPE_PIPE:
3470 pipe = (struct pipe *)fp->f_data;
3471 PIPE_LOCK(pipe);
3472 error = mac_pipe_label_set(td->td_ucred, pipe, &intlabel);
3473 PIPE_UNLOCK(pipe);
3474 break;
3475 default:
3476 error = EINVAL;
3477 }
3478
3479out2:
3480 fdrop(fp, td);
3481out1:
3482 mtx_unlock(&Giant);
3483 return (error);
3484}
3485
3486/*
3487 * MPSAFE
3488 */
3489int
3490__mac_set_file(struct thread *td, struct __mac_set_file_args *uap)
3491{
3492 struct nameidata nd;
3493 struct mac extmac;
3494 struct label intlabel;
3495 struct mount *mp;
3496 int error;
3497
3498 mtx_lock(&Giant);
3499
3500 error = copyin(SCARG(uap, mac_p), &extmac, sizeof(extmac));
3501 if (error)
3502 goto out;
3503
3504 error = mac_internalize(&intlabel, &extmac);
3505 if (error)
3506 goto out;
3507
3508 NDINIT(&nd, LOOKUP, LOCKLEAF | FOLLOW, UIO_USERSPACE,
3509 SCARG(uap, path_p), td);
3510 error = namei(&nd);
3511 if (error)
3512 goto out2;
3513 error = vn_start_write(nd.ni_vp, &mp, V_WAIT | PCATCH);
3514 if (error)
3515 goto out2;
3516
3517 error = vn_setlabel(nd.ni_vp, &intlabel, td->td_ucred);
3518
3519 vn_finished_write(mp);
3520out2:
3521 mac_destroy_temp(&intlabel);
3522 NDFREE(&nd, 0);
3523out:
3524 mtx_unlock(&Giant);
3525 return (error);
3526}
3527
3528int
3529mac_syscall(struct thread *td, struct mac_syscall_args *uap)
3530{
3531 struct mac_policy_conf *mpc;
3532 char target[MAC_MAX_POLICY_NAME];
3533 int error;
3534
3535 error = copyinstr(SCARG(uap, policy), target, sizeof(target), NULL);
3536 if (error)
3537 return (error);
3538
3539 error = ENOSYS;
3540 MAC_POLICY_LIST_BUSY();
3541 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) {
3542 if (strcmp(mpc->mpc_name, target) == 0 &&
3543 mpc->mpc_ops->mpo_syscall != NULL) {
3544 error = mpc->mpc_ops->mpo_syscall(td,
3545 SCARG(uap, call), SCARG(uap, arg));
3546 goto out;
3547 }
3548 }
3549
3550out:
3551 MAC_POLICY_LIST_UNBUSY();
3552 return (error);
3553}
3554
3555SYSINIT(mac, SI_SUB_MAC, SI_ORDER_FIRST, mac_init, NULL);
3556SYSINIT(mac_late, SI_SUB_MAC_LATE, SI_ORDER_FIRST, mac_late_init, NULL);
3557
3558#else /* !MAC */
3559
3560int
3561__mac_get_proc(struct thread *td, struct __mac_get_proc_args *uap)
3562{
3563
3564 return (ENOSYS);
3565}
3566
3567int
3568__mac_set_proc(struct thread *td, struct __mac_set_proc_args *uap)
3569{
3570
3571 return (ENOSYS);
3572}
3573
3574int
3575__mac_get_fd(struct thread *td, struct __mac_get_fd_args *uap)
3576{
3577
3578 return (ENOSYS);
3579}
3580
3581int
3582__mac_get_file(struct thread *td, struct __mac_get_file_args *uap)
3583{
3584
3585 return (ENOSYS);
3586}
3587
3588int
3589__mac_set_fd(struct thread *td, struct __mac_set_fd_args *uap)
3590{
3591
3592 return (ENOSYS);
3593}
3594
3595int
3596__mac_set_file(struct thread *td, struct __mac_set_file_args *uap)
3597{
3598
3599 return (ENOSYS);
3600}
3601
3602int
3603mac_syscall(struct thread *td, struct mac_syscall_args *uap)
3604{
3605
3606 return (ENOSYS);
3607}
3608
3609#endif /* !MAC */
|