49
50#include <sys/param.h>
51#include <sys/extattr.h>
52#include <sys/kernel.h>
53#include <sys/lock.h>
54#include <sys/malloc.h>
55#include <sys/mutex.h>
56#include <sys/mac.h>
57#include <sys/module.h>
58#include <sys/proc.h>
59#include <sys/systm.h>
60#include <sys/sysproto.h>
61#include <sys/sysent.h>
62#include <sys/vnode.h>
63#include <sys/mount.h>
64#include <sys/file.h>
65#include <sys/namei.h>
66#include <sys/socket.h>
67#include <sys/pipe.h>
68#include <sys/socketvar.h>
69#include <sys/sysctl.h>
70
71#include <vm/vm.h>
72#include <vm/pmap.h>
73#include <vm/vm_map.h>
74#include <vm/vm_object.h>
75
76#include <sys/mac_policy.h>
77
78#include <fs/devfs/devfs.h>
79
80#include <net/bpfdesc.h>
81#include <net/if.h>
82#include <net/if_var.h>
83
84#include <netinet/in.h>
85#include <netinet/ip_var.h>
86
87#ifdef MAC
88
89/*
90 * Declare that the kernel provides MAC support, version 1. This permits
91 * modules to refuse to be loaded if the necessary support isn't present,
92 * even if it's pre-boot.
93 */
94MODULE_VERSION(kernel_mac_support, 1);
95
96SYSCTL_DECL(_security);
97
98SYSCTL_NODE(_security, OID_AUTO, mac, CTLFLAG_RW, 0,
99 "TrustedBSD MAC policy controls");
100#ifndef MAC_MAX_POLICIES
101#define MAC_MAX_POLICIES 8
102#endif
103#if MAC_MAX_POLICIES > 32
104#error "MAC_MAX_POLICIES too large"
105#endif
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
180static unsigned int nmacmbufs, nmaccreds, nmacifnets, nmacbpfdescs,
181 nmacsockets, nmacmounts, nmactemp, nmacvnodes, nmacdevfsdirents,
182 nmacipqs, nmacpipes;
183SYSCTL_UINT(_security_mac_debug, OID_AUTO, mbufs, CTLFLAG_RD,
184 &nmacmbufs, 0, "number of mbufs in use");
185SYSCTL_UINT(_security_mac_debug, OID_AUTO, creds, CTLFLAG_RD,
186 &nmaccreds, 0, "number of ucreds in use");
187SYSCTL_UINT(_security_mac_debug, OID_AUTO, ifnets, CTLFLAG_RD,
188 &nmacifnets, 0, "number of ifnets in use");
189SYSCTL_UINT(_security_mac_debug, OID_AUTO, ipqs, CTLFLAG_RD,
190 &nmacipqs, 0, "number of ipqs in use");
191SYSCTL_UINT(_security_mac_debug, OID_AUTO, bpfdescs, CTLFLAG_RD,
192 &nmacbpfdescs, 0, "number of bpfdescs in use");
193SYSCTL_UINT(_security_mac_debug, OID_AUTO, sockets, CTLFLAG_RD,
194 &nmacsockets, 0, "number of sockets in use");
195SYSCTL_UINT(_security_mac_debug, OID_AUTO, pipes, CTLFLAG_RD,
196 &nmacpipes, 0, "number of pipes in use");
197SYSCTL_UINT(_security_mac_debug, OID_AUTO, mounts, CTLFLAG_RD,
198 &nmacmounts, 0, "number of mounts in use");
199SYSCTL_UINT(_security_mac_debug, OID_AUTO, temp, CTLFLAG_RD,
200 &nmactemp, 0, "number of temporary labels in use");
201SYSCTL_UINT(_security_mac_debug, OID_AUTO, vnodes, CTLFLAG_RD,
202 &nmacvnodes, 0, "number of vnodes in use");
203SYSCTL_UINT(_security_mac_debug, OID_AUTO, devfsdirents, CTLFLAG_RD,
204 &nmacdevfsdirents, 0, "number of devfs dirents inuse");
205#endif
206
207static int error_select(int error1, int error2);
208static int mac_externalize(struct label *label, struct mac *mac);
209static int mac_policy_register(struct mac_policy_conf *mpc);
210static int mac_policy_unregister(struct mac_policy_conf *mpc);
211
212static int mac_stdcreatevnode_ea(struct vnode *vp);
213static void mac_cred_mmapped_drop_perms(struct thread *td,
214 struct ucred *cred);
215static void mac_cred_mmapped_drop_perms_recurse(struct thread *td,
216 struct ucred *cred, struct vm_map *map);
217
218MALLOC_DEFINE(M_MACOPVEC, "macopvec", "MAC policy operation vector");
219MALLOC_DEFINE(M_MACPIPELABEL, "macpipelabel", "MAC labels for pipes");
220
221/*
222 * mac_policy_list_lock protects the consistency of 'mac_policy_list',
223 * the linked list of attached policy modules. Read-only consumers of
224 * the list must acquire a shared lock for the duration of their use;
225 * writers must acquire an exclusive lock. Note that for compound
226 * operations, locks should be held for the entire compound operation,
227 * and that this is not yet done for relabel requests.
228 */
229static struct mtx mac_policy_list_lock;
230static LIST_HEAD(, mac_policy_conf) mac_policy_list;
231static int mac_policy_list_busy;
232#define MAC_POLICY_LIST_LOCKINIT() mtx_init(&mac_policy_list_lock, \
233 "mac_policy_list_lock", NULL, MTX_DEF);
234#define MAC_POLICY_LIST_LOCK() mtx_lock(&mac_policy_list_lock);
235#define MAC_POLICY_LIST_UNLOCK() mtx_unlock(&mac_policy_list_lock);
236
237#define MAC_POLICY_LIST_BUSY() do { \
238 MAC_POLICY_LIST_LOCK(); \
239 mac_policy_list_busy++; \
240 MAC_POLICY_LIST_UNLOCK(); \
241} while (0)
242
243#define MAC_POLICY_LIST_UNBUSY() do { \
244 MAC_POLICY_LIST_LOCK(); \
245 mac_policy_list_busy--; \
246 if (mac_policy_list_busy < 0) \
247 panic("Extra mac_policy_list_busy--"); \
248 MAC_POLICY_LIST_UNLOCK(); \
249} while (0)
250
251/*
252 * MAC_CHECK performs the designated check by walking the policy
253 * module list and checking with each as to how it feels about the
254 * request. Note that it returns its value via 'error' in the scope
255 * of the caller.
256 */
257#define MAC_CHECK(check, args...) do { \
258 struct mac_policy_conf *mpc; \
259 \
260 error = 0; \
261 MAC_POLICY_LIST_BUSY(); \
262 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \
263 if (mpc->mpc_ops->mpo_ ## check != NULL) \
264 error = error_select( \
265 mpc->mpc_ops->mpo_ ## check (args), \
266 error); \
267 } \
268 MAC_POLICY_LIST_UNBUSY(); \
269} while (0)
270
271/*
272 * MAC_BOOLEAN performs the designated boolean composition by walking
273 * the module list, invoking each instance of the operation, and
274 * combining the results using the passed C operator. Note that it
275 * returns its value via 'result' in the scope of the caller, which
276 * should be initialized by the caller in a meaningful way to get
277 * a meaningful result.
278 */
279#define MAC_BOOLEAN(operation, composition, args...) do { \
280 struct mac_policy_conf *mpc; \
281 \
282 MAC_POLICY_LIST_BUSY(); \
283 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \
284 if (mpc->mpc_ops->mpo_ ## operation != NULL) \
285 result = result composition \
286 mpc->mpc_ops->mpo_ ## operation (args); \
287 } \
288 MAC_POLICY_LIST_UNBUSY(); \
289} while (0)
290
291/*
292 * MAC_PERFORM performs the designated operation by walking the policy
293 * module list and invoking that operation for each policy.
294 */
295#define MAC_PERFORM(operation, args...) do { \
296 struct mac_policy_conf *mpc; \
297 \
298 MAC_POLICY_LIST_BUSY(); \
299 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \
300 if (mpc->mpc_ops->mpo_ ## operation != NULL) \
301 mpc->mpc_ops->mpo_ ## operation (args); \
302 } \
303 MAC_POLICY_LIST_UNBUSY(); \
304} while (0)
305
306/*
307 * Initialize the MAC subsystem, including appropriate SMP locks.
308 */
309static void
310mac_init(void)
311{
312
313 LIST_INIT(&mac_policy_list);
314 MAC_POLICY_LIST_LOCKINIT();
315}
316
317/*
318 * For the purposes of modules that want to know if they were loaded
319 * "early", set the mac_late flag once we've processed modules either
320 * linked into the kernel, or loaded before the kernel startup.
321 */
322static void
323mac_late_init(void)
324{
325
326 mac_late = 1;
327}
328
329/*
330 * Allow MAC policy modules to register during boot, etc.
331 */
332int
333mac_policy_modevent(module_t mod, int type, void *data)
334{
335 struct mac_policy_conf *mpc;
336 int error;
337
338 error = 0;
339 mpc = (struct mac_policy_conf *) data;
340
341 switch (type) {
342 case MOD_LOAD:
343 if (mpc->mpc_loadtime_flags & MPC_LOADTIME_FLAG_NOTLATE &&
344 mac_late) {
345 printf("mac_policy_modevent: can't load %s policy "
346 "after booting\n", mpc->mpc_name);
347 error = EBUSY;
348 break;
349 }
350 error = mac_policy_register(mpc);
351 break;
352 case MOD_UNLOAD:
353 /* Don't unregister the module if it was never registered. */
354 if ((mpc->mpc_runtime_flags & MPC_RUNTIME_FLAG_REGISTERED)
355 != 0)
356 error = mac_policy_unregister(mpc);
357 else
358 error = 0;
359 break;
360 default:
361 break;
362 }
363
364 return (error);
365}
366
367static int
368mac_policy_register(struct mac_policy_conf *mpc)
369{
370 struct mac_policy_conf *tmpc;
371 struct mac_policy_op_entry *mpe;
372 int slot;
373
374 MALLOC(mpc->mpc_ops, struct mac_policy_ops *, sizeof(*mpc->mpc_ops),
375 M_MACOPVEC, M_WAITOK | M_ZERO);
376 for (mpe = mpc->mpc_entries; mpe->mpe_constant != MAC_OP_LAST; mpe++) {
377 switch (mpe->mpe_constant) {
378 case MAC_OP_LAST:
379 /*
380 * Doesn't actually happen, but this allows checking
381 * that all enumerated values are handled.
382 */
383 break;
384 case MAC_DESTROY:
385 mpc->mpc_ops->mpo_destroy =
386 mpe->mpe_function;
387 break;
388 case MAC_INIT:
389 mpc->mpc_ops->mpo_init =
390 mpe->mpe_function;
391 break;
392 case MAC_SYSCALL:
393 mpc->mpc_ops->mpo_syscall =
394 mpe->mpe_function;
395 break;
396 case MAC_INIT_BPFDESC:
397 mpc->mpc_ops->mpo_init_bpfdesc =
398 mpe->mpe_function;
399 break;
400 case MAC_INIT_CRED:
401 mpc->mpc_ops->mpo_init_cred =
402 mpe->mpe_function;
403 break;
404 case MAC_INIT_DEVFSDIRENT:
405 mpc->mpc_ops->mpo_init_devfsdirent =
406 mpe->mpe_function;
407 break;
408 case MAC_INIT_IFNET:
409 mpc->mpc_ops->mpo_init_ifnet =
410 mpe->mpe_function;
411 break;
412 case MAC_INIT_IPQ:
413 mpc->mpc_ops->mpo_init_ipq =
414 mpe->mpe_function;
415 break;
416 case MAC_INIT_MBUF:
417 mpc->mpc_ops->mpo_init_mbuf =
418 mpe->mpe_function;
419 break;
420 case MAC_INIT_MOUNT:
421 mpc->mpc_ops->mpo_init_mount =
422 mpe->mpe_function;
423 break;
424 case MAC_INIT_PIPE:
425 mpc->mpc_ops->mpo_init_pipe =
426 mpe->mpe_function;
427 break;
428 case MAC_INIT_SOCKET:
429 mpc->mpc_ops->mpo_init_socket =
430 mpe->mpe_function;
431 break;
432 case MAC_INIT_TEMP:
433 mpc->mpc_ops->mpo_init_temp =
434 mpe->mpe_function;
435 break;
436 case MAC_INIT_VNODE:
437 mpc->mpc_ops->mpo_init_vnode =
438 mpe->mpe_function;
439 break;
440 case MAC_DESTROY_BPFDESC:
441 mpc->mpc_ops->mpo_destroy_bpfdesc =
442 mpe->mpe_function;
443 break;
444 case MAC_DESTROY_CRED:
445 mpc->mpc_ops->mpo_destroy_cred =
446 mpe->mpe_function;
447 break;
448 case MAC_DESTROY_DEVFSDIRENT:
449 mpc->mpc_ops->mpo_destroy_devfsdirent =
450 mpe->mpe_function;
451 break;
452 case MAC_DESTROY_IFNET:
453 mpc->mpc_ops->mpo_destroy_ifnet =
454 mpe->mpe_function;
455 break;
456 case MAC_DESTROY_IPQ:
457 mpc->mpc_ops->mpo_destroy_ipq =
458 mpe->mpe_function;
459 break;
460 case MAC_DESTROY_MBUF:
461 mpc->mpc_ops->mpo_destroy_mbuf =
462 mpe->mpe_function;
463 break;
464 case MAC_DESTROY_MOUNT:
465 mpc->mpc_ops->mpo_destroy_mount =
466 mpe->mpe_function;
467 break;
468 case MAC_DESTROY_PIPE:
469 mpc->mpc_ops->mpo_destroy_pipe =
470 mpe->mpe_function;
471 break;
472 case MAC_DESTROY_SOCKET:
473 mpc->mpc_ops->mpo_destroy_socket =
474 mpe->mpe_function;
475 break;
476 case MAC_DESTROY_TEMP:
477 mpc->mpc_ops->mpo_destroy_temp =
478 mpe->mpe_function;
479 break;
480 case MAC_DESTROY_VNODE:
481 mpc->mpc_ops->mpo_destroy_vnode =
482 mpe->mpe_function;
483 break;
484 case MAC_EXTERNALIZE:
485 mpc->mpc_ops->mpo_externalize =
486 mpe->mpe_function;
487 break;
488 case MAC_INTERNALIZE:
489 mpc->mpc_ops->mpo_internalize =
490 mpe->mpe_function;
491 break;
492 case MAC_CREATE_DEVFS_DEVICE:
493 mpc->mpc_ops->mpo_create_devfs_device =
494 mpe->mpe_function;
495 break;
496 case MAC_CREATE_DEVFS_DIRECTORY:
497 mpc->mpc_ops->mpo_create_devfs_directory =
498 mpe->mpe_function;
499 break;
500 case MAC_CREATE_DEVFS_VNODE:
501 mpc->mpc_ops->mpo_create_devfs_vnode =
502 mpe->mpe_function;
503 break;
504 case MAC_STDCREATEVNODE_EA:
505 mpc->mpc_ops->mpo_stdcreatevnode_ea =
506 mpe->mpe_function;
507 break;
508 case MAC_CREATE_VNODE:
509 mpc->mpc_ops->mpo_create_vnode =
510 mpe->mpe_function;
511 break;
512 case MAC_CREATE_MOUNT:
513 mpc->mpc_ops->mpo_create_mount =
514 mpe->mpe_function;
515 break;
516 case MAC_CREATE_ROOT_MOUNT:
517 mpc->mpc_ops->mpo_create_root_mount =
518 mpe->mpe_function;
519 break;
520 case MAC_RELABEL_VNODE:
521 mpc->mpc_ops->mpo_relabel_vnode =
522 mpe->mpe_function;
523 break;
524 case MAC_UPDATE_DEVFSDIRENT:
525 mpc->mpc_ops->mpo_update_devfsdirent =
526 mpe->mpe_function;
527 break;
528 case MAC_UPDATE_PROCFSVNODE:
529 mpc->mpc_ops->mpo_update_procfsvnode =
530 mpe->mpe_function;
531 break;
532 case MAC_UPDATE_VNODE_FROM_EXTATTR:
533 mpc->mpc_ops->mpo_update_vnode_from_extattr =
534 mpe->mpe_function;
535 break;
536 case MAC_UPDATE_VNODE_FROM_EXTERNALIZED:
537 mpc->mpc_ops->mpo_update_vnode_from_externalized =
538 mpe->mpe_function;
539 break;
540 case MAC_UPDATE_VNODE_FROM_MOUNT:
541 mpc->mpc_ops->mpo_update_vnode_from_mount =
542 mpe->mpe_function;
543 break;
544 case MAC_CREATE_MBUF_FROM_SOCKET:
545 mpc->mpc_ops->mpo_create_mbuf_from_socket =
546 mpe->mpe_function;
547 break;
548 case MAC_CREATE_PIPE:
549 mpc->mpc_ops->mpo_create_pipe =
550 mpe->mpe_function;
551 break;
552 case MAC_CREATE_SOCKET:
553 mpc->mpc_ops->mpo_create_socket =
554 mpe->mpe_function;
555 break;
556 case MAC_CREATE_SOCKET_FROM_SOCKET:
557 mpc->mpc_ops->mpo_create_socket_from_socket =
558 mpe->mpe_function;
559 break;
560 case MAC_RELABEL_PIPE:
561 mpc->mpc_ops->mpo_relabel_pipe =
562 mpe->mpe_function;
563 break;
564 case MAC_RELABEL_SOCKET:
565 mpc->mpc_ops->mpo_relabel_socket =
566 mpe->mpe_function;
567 break;
568 case MAC_SET_SOCKET_PEER_FROM_MBUF:
569 mpc->mpc_ops->mpo_set_socket_peer_from_mbuf =
570 mpe->mpe_function;
571 break;
572 case MAC_SET_SOCKET_PEER_FROM_SOCKET:
573 mpc->mpc_ops->mpo_set_socket_peer_from_socket =
574 mpe->mpe_function;
575 break;
576 case MAC_CREATE_BPFDESC:
577 mpc->mpc_ops->mpo_create_bpfdesc =
578 mpe->mpe_function;
579 break;
580 case MAC_CREATE_DATAGRAM_FROM_IPQ:
581 mpc->mpc_ops->mpo_create_datagram_from_ipq =
582 mpe->mpe_function;
583 break;
584 case MAC_CREATE_FRAGMENT:
585 mpc->mpc_ops->mpo_create_fragment =
586 mpe->mpe_function;
587 break;
588 case MAC_CREATE_IFNET:
589 mpc->mpc_ops->mpo_create_ifnet =
590 mpe->mpe_function;
591 break;
592 case MAC_CREATE_IPQ:
593 mpc->mpc_ops->mpo_create_ipq =
594 mpe->mpe_function;
595 break;
596 case MAC_CREATE_MBUF_FROM_MBUF:
597 mpc->mpc_ops->mpo_create_mbuf_from_mbuf =
598 mpe->mpe_function;
599 break;
600 case MAC_CREATE_MBUF_LINKLAYER:
601 mpc->mpc_ops->mpo_create_mbuf_linklayer =
602 mpe->mpe_function;
603 break;
604 case MAC_CREATE_MBUF_FROM_BPFDESC:
605 mpc->mpc_ops->mpo_create_mbuf_from_bpfdesc =
606 mpe->mpe_function;
607 break;
608 case MAC_CREATE_MBUF_FROM_IFNET:
609 mpc->mpc_ops->mpo_create_mbuf_from_ifnet =
610 mpe->mpe_function;
611 break;
612 case MAC_CREATE_MBUF_MULTICAST_ENCAP:
613 mpc->mpc_ops->mpo_create_mbuf_multicast_encap =
614 mpe->mpe_function;
615 break;
616 case MAC_CREATE_MBUF_NETLAYER:
617 mpc->mpc_ops->mpo_create_mbuf_netlayer =
618 mpe->mpe_function;
619 break;
620 case MAC_FRAGMENT_MATCH:
621 mpc->mpc_ops->mpo_fragment_match =
622 mpe->mpe_function;
623 break;
624 case MAC_RELABEL_IFNET:
625 mpc->mpc_ops->mpo_relabel_ifnet =
626 mpe->mpe_function;
627 break;
628 case MAC_UPDATE_IPQ:
629 mpc->mpc_ops->mpo_update_ipq =
630 mpe->mpe_function;
631 break;
632 case MAC_CREATE_CRED:
633 mpc->mpc_ops->mpo_create_cred =
634 mpe->mpe_function;
635 break;
636 case MAC_EXECVE_TRANSITION:
637 mpc->mpc_ops->mpo_execve_transition =
638 mpe->mpe_function;
639 break;
640 case MAC_EXECVE_WILL_TRANSITION:
641 mpc->mpc_ops->mpo_execve_will_transition =
642 mpe->mpe_function;
643 break;
644 case MAC_CREATE_PROC0:
645 mpc->mpc_ops->mpo_create_proc0 = mpe->mpe_function;
646 break;
647 case MAC_CREATE_PROC1:
648 mpc->mpc_ops->mpo_create_proc1 = mpe->mpe_function;
649 break;
650 case MAC_RELABEL_CRED:
651 mpc->mpc_ops->mpo_relabel_cred =
652 mpe->mpe_function;
653 break;
654 case MAC_CHECK_BPFDESC_RECEIVE:
655 mpc->mpc_ops->mpo_check_bpfdesc_receive =
656 mpe->mpe_function;
657 break;
658 case MAC_CHECK_CRED_RELABEL:
659 mpc->mpc_ops->mpo_check_cred_relabel =
660 mpe->mpe_function;
661 break;
662 case MAC_CHECK_CRED_VISIBLE:
663 mpc->mpc_ops->mpo_check_cred_visible =
664 mpe->mpe_function;
665 break;
666 case MAC_CHECK_IFNET_RELABEL:
667 mpc->mpc_ops->mpo_check_ifnet_relabel =
668 mpe->mpe_function;
669 break;
670 case MAC_CHECK_IFNET_TRANSMIT:
671 mpc->mpc_ops->mpo_check_ifnet_transmit =
672 mpe->mpe_function;
673 break;
674 case MAC_CHECK_MOUNT_STAT:
675 mpc->mpc_ops->mpo_check_mount_stat =
676 mpe->mpe_function;
677 break;
678 case MAC_CHECK_PIPE_IOCTL:
679 mpc->mpc_ops->mpo_check_pipe_ioctl =
680 mpe->mpe_function;
681 break;
682 case MAC_CHECK_PIPE_POLL:
683 mpc->mpc_ops->mpo_check_pipe_poll =
684 mpe->mpe_function;
685 break;
686 case MAC_CHECK_PIPE_READ:
687 mpc->mpc_ops->mpo_check_pipe_read =
688 mpe->mpe_function;
689 break;
690 case MAC_CHECK_PIPE_RELABEL:
691 mpc->mpc_ops->mpo_check_pipe_relabel =
692 mpe->mpe_function;
693 break;
694 case MAC_CHECK_PIPE_STAT:
695 mpc->mpc_ops->mpo_check_pipe_stat =
696 mpe->mpe_function;
697 break;
698 case MAC_CHECK_PIPE_WRITE:
699 mpc->mpc_ops->mpo_check_pipe_write =
700 mpe->mpe_function;
701 break;
702 case MAC_CHECK_PROC_DEBUG:
703 mpc->mpc_ops->mpo_check_proc_debug =
704 mpe->mpe_function;
705 break;
706 case MAC_CHECK_PROC_SCHED:
707 mpc->mpc_ops->mpo_check_proc_sched =
708 mpe->mpe_function;
709 break;
710 case MAC_CHECK_PROC_SIGNAL:
711 mpc->mpc_ops->mpo_check_proc_signal =
712 mpe->mpe_function;
713 break;
714 case MAC_CHECK_SOCKET_BIND:
715 mpc->mpc_ops->mpo_check_socket_bind =
716 mpe->mpe_function;
717 break;
718 case MAC_CHECK_SOCKET_CONNECT:
719 mpc->mpc_ops->mpo_check_socket_connect =
720 mpe->mpe_function;
721 break;
722 case MAC_CHECK_SOCKET_DELIVER:
723 mpc->mpc_ops->mpo_check_socket_deliver =
724 mpe->mpe_function;
725 break;
726 case MAC_CHECK_SOCKET_LISTEN:
727 mpc->mpc_ops->mpo_check_socket_listen =
728 mpe->mpe_function;
729 break;
730 case MAC_CHECK_SOCKET_RELABEL:
731 mpc->mpc_ops->mpo_check_socket_relabel =
732 mpe->mpe_function;
733 break;
734 case MAC_CHECK_SOCKET_VISIBLE:
735 mpc->mpc_ops->mpo_check_socket_visible =
736 mpe->mpe_function;
737 break;
738 case MAC_CHECK_VNODE_ACCESS:
739 mpc->mpc_ops->mpo_check_vnode_access =
740 mpe->mpe_function;
741 break;
742 case MAC_CHECK_VNODE_CHDIR:
743 mpc->mpc_ops->mpo_check_vnode_chdir =
744 mpe->mpe_function;
745 break;
746 case MAC_CHECK_VNODE_CHROOT:
747 mpc->mpc_ops->mpo_check_vnode_chroot =
748 mpe->mpe_function;
749 break;
750 case MAC_CHECK_VNODE_CREATE:
751 mpc->mpc_ops->mpo_check_vnode_create =
752 mpe->mpe_function;
753 break;
754 case MAC_CHECK_VNODE_DELETE:
755 mpc->mpc_ops->mpo_check_vnode_delete =
756 mpe->mpe_function;
757 break;
758 case MAC_CHECK_VNODE_DELETEACL:
759 mpc->mpc_ops->mpo_check_vnode_deleteacl =
760 mpe->mpe_function;
761 break;
762 case MAC_CHECK_VNODE_EXEC:
763 mpc->mpc_ops->mpo_check_vnode_exec =
764 mpe->mpe_function;
765 break;
766 case MAC_CHECK_VNODE_GETACL:
767 mpc->mpc_ops->mpo_check_vnode_getacl =
768 mpe->mpe_function;
769 break;
770 case MAC_CHECK_VNODE_GETEXTATTR:
771 mpc->mpc_ops->mpo_check_vnode_getextattr =
772 mpe->mpe_function;
773 break;
774 case MAC_CHECK_VNODE_LOOKUP:
775 mpc->mpc_ops->mpo_check_vnode_lookup =
776 mpe->mpe_function;
777 break;
778 case MAC_CHECK_VNODE_MMAP_PERMS:
779 mpc->mpc_ops->mpo_check_vnode_mmap_perms =
780 mpe->mpe_function;
781 break;
782 case MAC_CHECK_VNODE_OPEN:
783 mpc->mpc_ops->mpo_check_vnode_open =
784 mpe->mpe_function;
785 break;
786 case MAC_CHECK_VNODE_POLL:
787 mpc->mpc_ops->mpo_check_vnode_poll =
788 mpe->mpe_function;
789 break;
790 case MAC_CHECK_VNODE_READ:
791 mpc->mpc_ops->mpo_check_vnode_read =
792 mpe->mpe_function;
793 break;
794 case MAC_CHECK_VNODE_READDIR:
795 mpc->mpc_ops->mpo_check_vnode_readdir =
796 mpe->mpe_function;
797 break;
798 case MAC_CHECK_VNODE_READLINK:
799 mpc->mpc_ops->mpo_check_vnode_readlink =
800 mpe->mpe_function;
801 break;
802 case MAC_CHECK_VNODE_RELABEL:
803 mpc->mpc_ops->mpo_check_vnode_relabel =
804 mpe->mpe_function;
805 break;
806 case MAC_CHECK_VNODE_RENAME_FROM:
807 mpc->mpc_ops->mpo_check_vnode_rename_from =
808 mpe->mpe_function;
809 break;
810 case MAC_CHECK_VNODE_RENAME_TO:
811 mpc->mpc_ops->mpo_check_vnode_rename_to =
812 mpe->mpe_function;
813 break;
814 case MAC_CHECK_VNODE_REVOKE:
815 mpc->mpc_ops->mpo_check_vnode_revoke =
816 mpe->mpe_function;
817 break;
818 case MAC_CHECK_VNODE_SETACL:
819 mpc->mpc_ops->mpo_check_vnode_setacl =
820 mpe->mpe_function;
821 break;
822 case MAC_CHECK_VNODE_SETEXTATTR:
823 mpc->mpc_ops->mpo_check_vnode_setextattr =
824 mpe->mpe_function;
825 break;
826 case MAC_CHECK_VNODE_SETFLAGS:
827 mpc->mpc_ops->mpo_check_vnode_setflags =
828 mpe->mpe_function;
829 break;
830 case MAC_CHECK_VNODE_SETMODE:
831 mpc->mpc_ops->mpo_check_vnode_setmode =
832 mpe->mpe_function;
833 break;
834 case MAC_CHECK_VNODE_SETOWNER:
835 mpc->mpc_ops->mpo_check_vnode_setowner =
836 mpe->mpe_function;
837 break;
838 case MAC_CHECK_VNODE_SETUTIMES:
839 mpc->mpc_ops->mpo_check_vnode_setutimes =
840 mpe->mpe_function;
841 break;
842 case MAC_CHECK_VNODE_STAT:
843 mpc->mpc_ops->mpo_check_vnode_stat =
844 mpe->mpe_function;
845 break;
846 case MAC_CHECK_VNODE_WRITE:
847 mpc->mpc_ops->mpo_check_vnode_write =
848 mpe->mpe_function;
849 break;
850/*
851 default:
852 printf("MAC policy `%s': unknown operation %d\n",
853 mpc->mpc_name, mpe->mpe_constant);
854 return (EINVAL);
855*/
856 }
857 }
858 MAC_POLICY_LIST_LOCK();
859 if (mac_policy_list_busy > 0) {
860 MAC_POLICY_LIST_UNLOCK();
861 FREE(mpc->mpc_ops, M_MACOPVEC);
862 mpc->mpc_ops = NULL;
863 return (EBUSY);
864 }
865 LIST_FOREACH(tmpc, &mac_policy_list, mpc_list) {
866 if (strcmp(tmpc->mpc_name, mpc->mpc_name) == 0) {
867 MAC_POLICY_LIST_UNLOCK();
868 FREE(mpc->mpc_ops, M_MACOPVEC);
869 mpc->mpc_ops = NULL;
870 return (EEXIST);
871 }
872 }
873 if (mpc->mpc_field_off != NULL) {
874 slot = ffs(mac_policy_offsets_free);
875 if (slot == 0) {
876 MAC_POLICY_LIST_UNLOCK();
877 FREE(mpc->mpc_ops, M_MACOPVEC);
878 mpc->mpc_ops = NULL;
879 return (ENOMEM);
880 }
881 slot--;
882 mac_policy_offsets_free &= ~(1 << slot);
883 *mpc->mpc_field_off = slot;
884 }
885 mpc->mpc_runtime_flags |= MPC_RUNTIME_FLAG_REGISTERED;
886 LIST_INSERT_HEAD(&mac_policy_list, mpc, mpc_list);
887
888 /* Per-policy initialization. */
889 if (mpc->mpc_ops->mpo_init != NULL)
890 (*(mpc->mpc_ops->mpo_init))(mpc);
891 MAC_POLICY_LIST_UNLOCK();
892
893 printf("Security policy loaded: %s (%s)\n", mpc->mpc_fullname,
894 mpc->mpc_name);
895
896 return (0);
897}
898
899static int
900mac_policy_unregister(struct mac_policy_conf *mpc)
901{
902
903#if 0
904 /*
905 * Don't allow unloading modules with private data.
906 */
907 if (mpc->mpc_field_off != NULL)
908 return (EBUSY);
909#endif
910 if ((mpc->mpc_loadtime_flags & MPC_LOADTIME_FLAG_UNLOADOK) == 0)
911 return (EBUSY);
912 MAC_POLICY_LIST_LOCK();
913 if (mac_policy_list_busy > 0) {
914 MAC_POLICY_LIST_UNLOCK();
915 return (EBUSY);
916 }
917 if (mpc->mpc_ops->mpo_destroy != NULL)
918 (*(mpc->mpc_ops->mpo_destroy))(mpc);
919
920 LIST_REMOVE(mpc, mpc_list);
921 MAC_POLICY_LIST_UNLOCK();
922
923 FREE(mpc->mpc_ops, M_MACOPVEC);
924 mpc->mpc_ops = NULL;
925
926 printf("Security policy unload: %s (%s)\n", mpc->mpc_fullname,
927 mpc->mpc_name);
928
929 return (0);
930}
931
932/*
933 * Define an error value precedence, and given two arguments, selects the
934 * value with the higher precedence.
935 */
936static int
937error_select(int error1, int error2)
938{
939
940 /* Certain decision-making errors take top priority. */
941 if (error1 == EDEADLK || error2 == EDEADLK)
942 return (EDEADLK);
943
944 /* Invalid arguments should be reported where possible. */
945 if (error1 == EINVAL || error2 == EINVAL)
946 return (EINVAL);
947
948 /* Precedence goes to "visibility", with both process and file. */
949 if (error1 == ESRCH || error2 == ESRCH)
950 return (ESRCH);
951
952 if (error1 == ENOENT || error2 == ENOENT)
953 return (ENOENT);
954
955 /* Precedence goes to DAC/MAC protections. */
956 if (error1 == EACCES || error2 == EACCES)
957 return (EACCES);
958
959 /* Precedence goes to privilege. */
960 if (error1 == EPERM || error2 == EPERM)
961 return (EPERM);
962
963 /* Precedence goes to error over success; otherwise, arbitrary. */
964 if (error1 != 0)
965 return (error1);
966 return (error2);
967}
968
969void
970mac_update_devfsdirent(struct devfs_dirent *de, struct vnode *vp)
971{
972
973 MAC_PERFORM(update_devfsdirent, de, &de->de_label, vp, &vp->v_label);
974}
975
976void
977mac_update_procfsvnode(struct vnode *vp, struct ucred *cred)
978{
979
980 MAC_PERFORM(update_procfsvnode, vp, &vp->v_label, cred);
981}
982
983/*
984 * Support callout for policies that manage their own externalization
985 * using extended attributes.
986 */
987static int
988mac_update_vnode_from_extattr(struct vnode *vp, struct mount *mp)
989{
990 int error;
991
992 MAC_CHECK(update_vnode_from_extattr, vp, &vp->v_label, mp,
993 &mp->mnt_fslabel);
994
995 return (error);
996}
997
998/*
999 * Given an externalized mac label, internalize it and stamp it on a
1000 * vnode.
1001 */
1002static int
1003mac_update_vnode_from_externalized(struct vnode *vp, struct mac *extmac)
1004{
1005 int error;
1006
1007 MAC_CHECK(update_vnode_from_externalized, vp, &vp->v_label, extmac);
1008
1009 return (error);
1010}
1011
1012/*
1013 * Call out to individual policies to update the label in a vnode from
1014 * the mountpoint.
1015 */
1016void
1017mac_update_vnode_from_mount(struct vnode *vp, struct mount *mp)
1018{
1019
1020 MAC_PERFORM(update_vnode_from_mount, vp, &vp->v_label, mp,
1021 &mp->mnt_fslabel);
1022
1023 ASSERT_VOP_LOCKED(vp, "mac_update_vnode_from_mount");
1024 if (mac_cache_fslabel_in_vnode)
1025 vp->v_vflag |= VV_CACHEDLABEL;
1026}
1027
1028/*
1029 * Implementation of VOP_REFRESHLABEL() that relies on extended attributes
1030 * to store label data. Can be referenced by filesystems supporting
1031 * extended attributes.
1032 */
1033int
1034vop_stdrefreshlabel_ea(struct vop_refreshlabel_args *ap)
1035{
1036 struct vnode *vp = ap->a_vp;
1037 struct mac extmac;
1038 int buflen, error;
1039
1040 ASSERT_VOP_LOCKED(vp, "vop_stdrefreshlabel_ea");
1041
1042 /*
1043 * Call out to external policies first. Order doesn't really
1044 * matter, as long as failure of one assures failure of all.
1045 */
1046 error = mac_update_vnode_from_extattr(vp, vp->v_mount);
1047 if (error)
1048 return (error);
1049
1050 buflen = sizeof(extmac);
1051 error = vn_extattr_get(vp, IO_NODELOCKED,
1052 FREEBSD_MAC_EXTATTR_NAMESPACE, FREEBSD_MAC_EXTATTR_NAME, &buflen,
1053 (char *)&extmac, curthread);
1054 switch (error) {
1055 case 0:
1056 /* Got it */
1057 break;
1058
1059 case ENOATTR:
1060 /*
1061 * Use the label from the mount point.
1062 */
1063 mac_update_vnode_from_mount(vp, vp->v_mount);
1064 return (0);
1065
1066 case EOPNOTSUPP:
1067 default:
1068 /* Fail horribly. */
1069 return (error);
1070 }
1071
1072 if (buflen != sizeof(extmac))
1073 error = EPERM; /* Fail very closed. */
1074 if (error == 0)
1075 error = mac_update_vnode_from_externalized(vp, &extmac);
1076 if (error == 0)
1077 vp->v_vflag |= VV_CACHEDLABEL;
1078 else {
1079 struct vattr va;
1080
1081 printf("Corrupted label on %s",
1082 vp->v_mount->mnt_stat.f_mntonname);
1083 if (VOP_GETATTR(vp, &va, curthread->td_ucred, curthread) == 0)
1084 printf(" inum %ld", va.va_fileid);
1085#ifdef MAC_DEBUG
1086 if (mac_debug_label_fallback) {
1087 printf(", falling back.\n");
1088 mac_update_vnode_from_mount(vp, vp->v_mount);
1089 error = 0;
1090 } else {
1091#endif
1092 printf(".\n");
1093 error = EPERM;
1094#ifdef MAC_DEBUG
1095 }
1096#endif
1097 }
1098
1099 return (error);
1100}
1101
1102/*
1103 * Make sure the vnode label is up-to-date. If EOPNOTSUPP, then we handle
1104 * the labeling activity outselves. Filesystems should be careful not
1105 * to change their minds regarding whether they support vop_refreshlabel()
1106 * for a vnode or not. Don't cache the vnode here, allow the file
1107 * system code to determine if it's safe to cache. If we update from
1108 * the mount, don't cache since a change to the mount label should affect
1109 * all vnodes.
1110 */
1111static int
1112vn_refreshlabel(struct vnode *vp, struct ucred *cred)
1113{
1114 int error;
1115
1116 ASSERT_VOP_LOCKED(vp, "vn_refreshlabel");
1117
1118 if (vp->v_mount == NULL) {
1119/*
1120 Eventually, we probably want to special-case refreshing
1121 of deadfs vnodes, and if there's a lock-free race somewhere,
1122 that case might be handled here.
1123
1124 mac_update_vnode_deadfs(vp);
1125 return (0);
1126 */
1127 /* printf("vn_refreshlabel: null v_mount\n"); */
1128 if (vp->v_type != VNON)
1129 printf(
1130 "vn_refreshlabel: null v_mount with non-VNON\n");
1131 return (EBADF);
1132 }
1133
1134 if (vp->v_vflag & VV_CACHEDLABEL) {
1135 mac_vnode_label_cache_hits++;
1136 return (0);
1137 } else
1138 mac_vnode_label_cache_misses++;
1139
1140 if ((vp->v_mount->mnt_flag & MNT_MULTILABEL) == 0) {
1141 mac_update_vnode_from_mount(vp, vp->v_mount);
1142 return (0);
1143 }
1144
1145 error = VOP_REFRESHLABEL(vp, cred, curthread);
1146 switch (error) {
1147 case EOPNOTSUPP:
1148 /*
1149 * If labels are not supported on this vnode, fall back to
1150 * the label in the mount and propagate it to the vnode.
1151 * There should probably be some sort of policy/flag/decision
1152 * about doing this.
1153 */
1154 mac_update_vnode_from_mount(vp, vp->v_mount);
1155 error = 0;
1156 default:
1157 return (error);
1158 }
1159}
1160
1161/*
1162 * Helper function for file systems using the vop_std*_ea() calls. This
1163 * function must be called after EA service is available for the vnode,
1164 * but before it's hooked up to the namespace so that the node persists
1165 * if there's a crash, or before it can be accessed. On successful
1166 * commit of the label to disk (etc), do cache the label.
1167 */
1168int
1169vop_stdcreatevnode_ea(struct vnode *dvp, struct vnode *tvp, struct ucred *cred)
1170{
1171 struct mac extmac;
1172 int error;
1173
1174 ASSERT_VOP_LOCKED(tvp, "vop_stdcreatevnode_ea");
1175 if ((dvp->v_mount->mnt_flag & MNT_MULTILABEL) == 0) {
1176 mac_update_vnode_from_mount(tvp, tvp->v_mount);
1177 } else {
1178 error = vn_refreshlabel(dvp, cred);
1179 if (error)
1180 return (error);
1181
1182 /*
1183 * Stick the label in the vnode. Then try to write to
1184 * disk. If we fail, return a failure to abort the
1185 * create operation. Really, this failure shouldn't
1186 * happen except in fairly unusual circumstances (out
1187 * of disk, etc).
1188 */
1189 mac_create_vnode(cred, dvp, tvp);
1190
1191 error = mac_stdcreatevnode_ea(tvp);
1192 if (error)
1193 return (error);
1194
1195 /*
1196 * XXX: Eventually this will go away and all policies will
1197 * directly manage their extended attributes.
1198 */
1199 error = mac_externalize(&tvp->v_label, &extmac);
1200 if (error)
1201 return (error);
1202
1203 error = vn_extattr_set(tvp, IO_NODELOCKED,
1204 FREEBSD_MAC_EXTATTR_NAMESPACE, FREEBSD_MAC_EXTATTR_NAME,
1205 sizeof(extmac), (char *)&extmac, curthread);
1206 if (error == 0)
1207 tvp->v_vflag |= VV_CACHEDLABEL;
1208 else {
1209#if 0
1210 /*
1211 * In theory, we could have fall-back behavior here.
1212 * It would probably be incorrect.
1213 */
1214#endif
1215 return (error);
1216 }
1217 }
1218
1219 return (0);
1220}
1221
1222void
1223mac_execve_transition(struct ucred *old, struct ucred *new, struct vnode *vp)
1224{
1225 int error;
1226
1227 ASSERT_VOP_LOCKED(vp, "mac_execve_transition");
1228
1229 error = vn_refreshlabel(vp, old);
1230 if (error) {
1231 printf("mac_execve_transition: vn_refreshlabel returned %d\n",
1232 error);
1233 printf("mac_execve_transition: using old vnode label\n");
1234 }
1235
1236 MAC_PERFORM(execve_transition, old, new, vp, &vp->v_label);
1237}
1238
1239int
1240mac_execve_will_transition(struct ucred *old, struct vnode *vp)
1241{
1242 int error, result;
1243
1244 error = vn_refreshlabel(vp, old);
1245 if (error)
1246 return (error);
1247
1248 result = 0;
1249 MAC_BOOLEAN(execve_will_transition, ||, old, vp, &vp->v_label);
1250
1251 return (result);
1252}
1253
1254static void
1255mac_init_label(struct label *label)
1256{
1257
1258 bzero(label, sizeof(*label));
1259 label->l_flags = MAC_FLAG_INITIALIZED;
1260}
1261
1262static void
1263mac_init_structmac(struct mac *mac)
1264{
1265
1266 bzero(mac, sizeof(*mac));
1267 mac->m_macflags = MAC_FLAG_INITIALIZED;
1268}
1269
1270static void
1271mac_destroy_label(struct label *label)
1272{
1273
1274 KASSERT(label->l_flags & MAC_FLAG_INITIALIZED,
1275 ("destroying uninitialized label"));
1276
1277 bzero(label, sizeof(*label));
1278 /* implicit: label->l_flags &= ~MAC_FLAG_INITIALIZED; */
1279}
1280
1281int
1282mac_init_mbuf(struct mbuf *m, int how)
1283{
1284 KASSERT(m->m_flags & M_PKTHDR, ("mac_init_mbuf on non-header mbuf"));
1285
1286 /* "how" is one of M_(TRY|DONT)WAIT */
1287 mac_init_label(&m->m_pkthdr.label);
1288 MAC_PERFORM(init_mbuf, m, how, &m->m_pkthdr.label);
1289#ifdef MAC_DEBUG
1290 atomic_add_int(&nmacmbufs, 1);
1291#endif
1292 return (0);
1293}
1294
1295void
1296mac_destroy_mbuf(struct mbuf *m)
1297{
1298
1299 MAC_PERFORM(destroy_mbuf, m, &m->m_pkthdr.label);
1300 mac_destroy_label(&m->m_pkthdr.label);
1301#ifdef MAC_DEBUG
1302 atomic_subtract_int(&nmacmbufs, 1);
1303#endif
1304}
1305
1306void
1307mac_init_cred(struct ucred *cr)
1308{
1309
1310 mac_init_label(&cr->cr_label);
1311 MAC_PERFORM(init_cred, cr, &cr->cr_label);
1312#ifdef MAC_DEBUG
1313 atomic_add_int(&nmaccreds, 1);
1314#endif
1315}
1316
1317void
1318mac_destroy_cred(struct ucred *cr)
1319{
1320
1321 MAC_PERFORM(destroy_cred, cr, &cr->cr_label);
1322 mac_destroy_label(&cr->cr_label);
1323#ifdef MAC_DEBUG
1324 atomic_subtract_int(&nmaccreds, 1);
1325#endif
1326}
1327
1328void
1329mac_init_ifnet(struct ifnet *ifp)
1330{
1331
1332 mac_init_label(&ifp->if_label);
1333 MAC_PERFORM(init_ifnet, ifp, &ifp->if_label);
1334#ifdef MAC_DEBUG
1335 atomic_add_int(&nmacifnets, 1);
1336#endif
1337}
1338
1339void
1340mac_destroy_ifnet(struct ifnet *ifp)
1341{
1342
1343 MAC_PERFORM(destroy_ifnet, ifp, &ifp->if_label);
1344 mac_destroy_label(&ifp->if_label);
1345#ifdef MAC_DEBUG
1346 atomic_subtract_int(&nmacifnets, 1);
1347#endif
1348}
1349
1350void
1351mac_init_ipq(struct ipq *ipq)
1352{
1353
1354 mac_init_label(&ipq->ipq_label);
1355 MAC_PERFORM(init_ipq, ipq, &ipq->ipq_label);
1356#ifdef MAC_DEBUG
1357 atomic_add_int(&nmacipqs, 1);
1358#endif
1359}
1360
1361void
1362mac_destroy_ipq(struct ipq *ipq)
1363{
1364
1365 MAC_PERFORM(destroy_ipq, ipq, &ipq->ipq_label);
1366 mac_destroy_label(&ipq->ipq_label);
1367#ifdef MAC_DEBUG
1368 atomic_subtract_int(&nmacipqs, 1);
1369#endif
1370}
1371
1372void
1373mac_init_socket(struct socket *socket)
1374{
1375
1376 mac_init_label(&socket->so_label);
1377 mac_init_label(&socket->so_peerlabel);
1378 MAC_PERFORM(init_socket, socket, &socket->so_label,
1379 &socket->so_peerlabel);
1380#ifdef MAC_DEBUG
1381 atomic_add_int(&nmacsockets, 1);
1382#endif
1383}
1384
1385void
1386mac_destroy_socket(struct socket *socket)
1387{
1388
1389 MAC_PERFORM(destroy_socket, socket, &socket->so_label,
1390 &socket->so_peerlabel);
1391 mac_destroy_label(&socket->so_label);
1392 mac_destroy_label(&socket->so_peerlabel);
1393#ifdef MAC_DEBUG
1394 atomic_subtract_int(&nmacsockets, 1);
1395#endif
1396}
1397
1398void
1399mac_init_pipe(struct pipe *pipe)
1400{
1401 struct label *label;
1402
1403 label = malloc(sizeof(struct label), M_MACPIPELABEL, M_ZERO|M_WAITOK);
1404 mac_init_label(label);
1405 pipe->pipe_label = label;
1406 pipe->pipe_peer->pipe_label = label;
1407 MAC_PERFORM(init_pipe, pipe, pipe->pipe_label);
1408#ifdef MAC_DEBUG
1409 atomic_add_int(&nmacpipes, 1);
1410#endif
1411}
1412
1413void
1414mac_destroy_pipe(struct pipe *pipe)
1415{
1416
1417 MAC_PERFORM(destroy_pipe, pipe, pipe->pipe_label);
1418 mac_destroy_label(pipe->pipe_label);
1419 free(pipe->pipe_label, M_MACPIPELABEL);
1420#ifdef MAC_DEBUG
1421 atomic_subtract_int(&nmacpipes, 1);
1422#endif
1423}
1424
1425void
1426mac_init_bpfdesc(struct bpf_d *bpf_d)
1427{
1428
1429 mac_init_label(&bpf_d->bd_label);
1430 MAC_PERFORM(init_bpfdesc, bpf_d, &bpf_d->bd_label);
1431#ifdef MAC_DEBUG
1432 atomic_add_int(&nmacbpfdescs, 1);
1433#endif
1434}
1435
1436void
1437mac_destroy_bpfdesc(struct bpf_d *bpf_d)
1438{
1439
1440 MAC_PERFORM(destroy_bpfdesc, bpf_d, &bpf_d->bd_label);
1441 mac_destroy_label(&bpf_d->bd_label);
1442#ifdef MAC_DEBUG
1443 atomic_subtract_int(&nmacbpfdescs, 1);
1444#endif
1445}
1446
1447void
1448mac_init_mount(struct mount *mp)
1449{
1450
1451 mac_init_label(&mp->mnt_mntlabel);
1452 mac_init_label(&mp->mnt_fslabel);
1453 MAC_PERFORM(init_mount, mp, &mp->mnt_mntlabel, &mp->mnt_fslabel);
1454#ifdef MAC_DEBUG
1455 atomic_add_int(&nmacmounts, 1);
1456#endif
1457}
1458
1459void
1460mac_destroy_mount(struct mount *mp)
1461{
1462
1463 MAC_PERFORM(destroy_mount, mp, &mp->mnt_mntlabel, &mp->mnt_fslabel);
1464 mac_destroy_label(&mp->mnt_fslabel);
1465 mac_destroy_label(&mp->mnt_mntlabel);
1466#ifdef MAC_DEBUG
1467 atomic_subtract_int(&nmacmounts, 1);
1468#endif
1469}
1470
1471static void
1472mac_init_temp(struct label *label)
1473{
1474
1475 mac_init_label(label);
1476 MAC_PERFORM(init_temp, label);
1477#ifdef MAC_DEBUG
1478 atomic_add_int(&nmactemp, 1);
1479#endif
1480}
1481
1482static void
1483mac_destroy_temp(struct label *label)
1484{
1485
1486 MAC_PERFORM(destroy_temp, label);
1487 mac_destroy_label(label);
1488#ifdef MAC_DEBUG
1489 atomic_subtract_int(&nmactemp, 1);
1490#endif
1491}
1492
1493void
1494mac_init_vnode(struct vnode *vp)
1495{
1496
1497 mac_init_label(&vp->v_label);
1498 MAC_PERFORM(init_vnode, vp, &vp->v_label);
1499#ifdef MAC_DEBUG
1500 atomic_add_int(&nmacvnodes, 1);
1501#endif
1502}
1503
1504void
1505mac_destroy_vnode(struct vnode *vp)
1506{
1507
1508 MAC_PERFORM(destroy_vnode, vp, &vp->v_label);
1509 mac_destroy_label(&vp->v_label);
1510#ifdef MAC_DEBUG
1511 atomic_subtract_int(&nmacvnodes, 1);
1512#endif
1513}
1514
1515void
1516mac_init_devfsdirent(struct devfs_dirent *de)
1517{
1518
1519 mac_init_label(&de->de_label);
1520 MAC_PERFORM(init_devfsdirent, de, &de->de_label);
1521#ifdef MAC_DEBUG
1522 atomic_add_int(&nmacdevfsdirents, 1);
1523#endif
1524}
1525
1526void
1527mac_destroy_devfsdirent(struct devfs_dirent *de)
1528{
1529
1530 MAC_PERFORM(destroy_devfsdirent, de, &de->de_label);
1531 mac_destroy_label(&de->de_label);
1532#ifdef MAC_DEBUG
1533 atomic_subtract_int(&nmacdevfsdirents, 1);
1534#endif
1535}
1536
1537static int
1538mac_externalize(struct label *label, struct mac *mac)
1539{
1540 int error;
1541
1542 mac_init_structmac(mac);
1543 MAC_CHECK(externalize, label, mac);
1544
1545 return (error);
1546}
1547
1548static int
1549mac_internalize(struct label *label, struct mac *mac)
1550{
1551 int error;
1552
1553 mac_init_temp(label);
1554 MAC_CHECK(internalize, label, mac);
1555 if (error)
1556 mac_destroy_temp(label);
1557
1558 return (error);
1559}
1560
1561/*
1562 * Initialize MAC label for the first kernel process, from which other
1563 * kernel processes and threads are spawned.
1564 */
1565void
1566mac_create_proc0(struct ucred *cred)
1567{
1568
1569 MAC_PERFORM(create_proc0, cred);
1570}
1571
1572/*
1573 * Initialize MAC label for the first userland process, from which other
1574 * userland processes and threads are spawned.
1575 */
1576void
1577mac_create_proc1(struct ucred *cred)
1578{
1579
1580 MAC_PERFORM(create_proc1, cred);
1581}
1582
1583/*
1584 * When a new process is created, its label must be initialized. Generally,
1585 * this involves inheritence from the parent process, modulo possible
1586 * deltas. This function allows that processing to take place.
1587 */
1588void
1589mac_create_cred(struct ucred *parent_cred, struct ucred *child_cred)
1590{
1591
1592 MAC_PERFORM(create_cred, parent_cred, child_cred);
1593}
1594
1595int
1596mac_check_vnode_access(struct ucred *cred, struct vnode *vp, int flags)
1597{
1598 int error;
1599
1600 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_access");
1601
1602 if (!mac_enforce_fs)
1603 return (0);
1604
1605 error = vn_refreshlabel(vp, cred);
1606 if (error)
1607 return (error);
1608
1609 MAC_CHECK(check_vnode_access, cred, vp, &vp->v_label, flags);
1610 return (error);
1611}
1612
1613int
1614mac_check_vnode_chdir(struct ucred *cred, struct vnode *dvp)
1615{
1616 int error;
1617
1618 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_chdir");
1619
1620 if (!mac_enforce_fs)
1621 return (0);
1622
1623 error = vn_refreshlabel(dvp, cred);
1624 if (error)
1625 return (error);
1626
1627 MAC_CHECK(check_vnode_chdir, cred, dvp, &dvp->v_label);
1628 return (error);
1629}
1630
1631int
1632mac_check_vnode_chroot(struct ucred *cred, struct vnode *dvp)
1633{
1634 int error;
1635
1636 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_chroot");
1637
1638 if (!mac_enforce_fs)
1639 return (0);
1640
1641 error = vn_refreshlabel(dvp, cred);
1642 if (error)
1643 return (error);
1644
1645 MAC_CHECK(check_vnode_chroot, cred, dvp, &dvp->v_label);
1646 return (error);
1647}
1648
1649int
1650mac_check_vnode_create(struct ucred *cred, struct vnode *dvp,
1651 struct componentname *cnp, struct vattr *vap)
1652{
1653 int error;
1654
1655 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_create");
1656
1657 if (!mac_enforce_fs)
1658 return (0);
1659
1660 error = vn_refreshlabel(dvp, cred);
1661 if (error)
1662 return (error);
1663
1664 MAC_CHECK(check_vnode_create, cred, dvp, &dvp->v_label, cnp, vap);
1665 return (error);
1666}
1667
1668int
1669mac_check_vnode_delete(struct ucred *cred, struct vnode *dvp, struct vnode *vp,
1670 struct componentname *cnp)
1671{
1672 int error;
1673
1674 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_delete");
1675 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_delete");
1676
1677 if (!mac_enforce_fs)
1678 return (0);
1679
1680 error = vn_refreshlabel(dvp, cred);
1681 if (error)
1682 return (error);
1683 error = vn_refreshlabel(vp, cred);
1684 if (error)
1685 return (error);
1686
1687 MAC_CHECK(check_vnode_delete, cred, dvp, &dvp->v_label, vp,
1688 &vp->v_label, cnp);
1689 return (error);
1690}
1691
1692int
1693mac_check_vnode_deleteacl(struct ucred *cred, struct vnode *vp,
1694 acl_type_t type)
1695{
1696 int error;
1697
1698 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_deleteacl");
1699
1700 if (!mac_enforce_fs)
1701 return (0);
1702
1703 error = vn_refreshlabel(vp, cred);
1704 if (error)
1705 return (error);
1706
1707 MAC_CHECK(check_vnode_deleteacl, cred, vp, &vp->v_label, type);
1708 return (error);
1709}
1710
1711int
1712mac_check_vnode_exec(struct ucred *cred, struct vnode *vp)
1713{
1714 int error;
1715
1716 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_exec");
1717
1718 if (!mac_enforce_process && !mac_enforce_fs)
1719 return (0);
1720
1721 error = vn_refreshlabel(vp, cred);
1722 if (error)
1723 return (error);
1724 MAC_CHECK(check_vnode_exec, cred, vp, &vp->v_label);
1725
1726 return (error);
1727}
1728
1729int
1730mac_check_vnode_getacl(struct ucred *cred, struct vnode *vp, acl_type_t type)
1731{
1732 int error;
1733
1734 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_getacl");
1735
1736 if (!mac_enforce_fs)
1737 return (0);
1738
1739 error = vn_refreshlabel(vp, cred);
1740 if (error)
1741 return (error);
1742
1743 MAC_CHECK(check_vnode_getacl, cred, vp, &vp->v_label, type);
1744 return (error);
1745}
1746
1747int
1748mac_check_vnode_getextattr(struct ucred *cred, struct vnode *vp,
1749 int attrnamespace, const char *name, struct uio *uio)
1750{
1751 int error;
1752
1753 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_getextattr");
1754
1755 if (!mac_enforce_fs)
1756 return (0);
1757
1758 error = vn_refreshlabel(vp, cred);
1759 if (error)
1760 return (error);
1761
1762 MAC_CHECK(check_vnode_getextattr, cred, vp, &vp->v_label,
1763 attrnamespace, name, uio);
1764 return (error);
1765}
1766
1767int
1768mac_check_vnode_lookup(struct ucred *cred, struct vnode *dvp,
1769 struct componentname *cnp)
1770{
1771 int error;
1772
1773 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_lookup");
1774
1775 if (!mac_enforce_fs)
1776 return (0);
1777
1778 error = vn_refreshlabel(dvp, cred);
1779 if (error)
1780 return (error);
1781
1782 MAC_CHECK(check_vnode_lookup, cred, dvp, &dvp->v_label, cnp);
1783 return (error);
1784}
1785
1786vm_prot_t
1787mac_check_vnode_mmap_prot(struct ucred *cred, struct vnode *vp, int newmapping)
1788{
1789 vm_prot_t result = VM_PROT_ALL;
1790
1791 if (!mac_enforce_vm)
1792 return (result);
1793
1794 /*
1795 * This should be some sort of MAC_BITWISE, maybe :)
1796 */
1797 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mmap_perms");
1798 MAC_BOOLEAN(check_vnode_mmap_perms, &, cred, vp, &vp->v_label,
1799 newmapping);
1800 return (result);
1801}
1802
1803int
1804mac_check_vnode_open(struct ucred *cred, struct vnode *vp, mode_t acc_mode)
1805{
1806 int error;
1807
1808 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_open");
1809
1810 if (!mac_enforce_fs)
1811 return (0);
1812
1813 error = vn_refreshlabel(vp, cred);
1814 if (error)
1815 return (error);
1816
1817 MAC_CHECK(check_vnode_open, cred, vp, &vp->v_label, acc_mode);
1818 return (error);
1819}
1820
1821int
1822mac_check_vnode_poll(struct ucred *active_cred, struct ucred *file_cred,
1823 struct vnode *vp)
1824{
1825 int error;
1826
1827 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_poll");
1828
1829 if (!mac_enforce_fs)
1830 return (0);
1831
1832 error = vn_refreshlabel(vp, active_cred);
1833 if (error)
1834 return (error);
1835
1836 MAC_CHECK(check_vnode_poll, active_cred, file_cred, vp,
1837 &vp->v_label);
1838
1839 return (error);
1840}
1841
1842int
1843mac_check_vnode_read(struct ucred *active_cred, struct ucred *file_cred,
1844 struct vnode *vp)
1845{
1846 int error;
1847
1848 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_read");
1849
1850 if (!mac_enforce_fs)
1851 return (0);
1852
1853 error = vn_refreshlabel(vp, active_cred);
1854 if (error)
1855 return (error);
1856
1857 MAC_CHECK(check_vnode_read, active_cred, file_cred, vp,
1858 &vp->v_label);
1859
1860 return (error);
1861}
1862
1863int
1864mac_check_vnode_readdir(struct ucred *cred, struct vnode *dvp)
1865{
1866 int error;
1867
1868 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_readdir");
1869
1870 if (!mac_enforce_fs)
1871 return (0);
1872
1873 error = vn_refreshlabel(dvp, cred);
1874 if (error)
1875 return (error);
1876
1877 MAC_CHECK(check_vnode_readdir, cred, dvp, &dvp->v_label);
1878 return (error);
1879}
1880
1881int
1882mac_check_vnode_readlink(struct ucred *cred, struct vnode *vp)
1883{
1884 int error;
1885
1886 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_readlink");
1887
1888 if (!mac_enforce_fs)
1889 return (0);
1890
1891 error = vn_refreshlabel(vp, cred);
1892 if (error)
1893 return (error);
1894
1895 MAC_CHECK(check_vnode_readlink, cred, vp, &vp->v_label);
1896 return (error);
1897}
1898
1899static int
1900mac_check_vnode_relabel(struct ucred *cred, struct vnode *vp,
1901 struct label *newlabel)
1902{
1903 int error;
1904
1905 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_relabel");
1906
1907 error = vn_refreshlabel(vp, cred);
1908 if (error)
1909 return (error);
1910
1911 MAC_CHECK(check_vnode_relabel, cred, vp, &vp->v_label, newlabel);
1912
1913 return (error);
1914}
1915
1916int
1917mac_check_vnode_rename_from(struct ucred *cred, struct vnode *dvp,
1918 struct vnode *vp, struct componentname *cnp)
1919{
1920 int error;
1921
1922 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_rename_from");
1923 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_rename_from");
1924
1925 if (!mac_enforce_fs)
1926 return (0);
1927
1928 error = vn_refreshlabel(dvp, cred);
1929 if (error)
1930 return (error);
1931 error = vn_refreshlabel(vp, cred);
1932 if (error)
1933 return (error);
1934
1935 MAC_CHECK(check_vnode_rename_from, cred, dvp, &dvp->v_label, vp,
1936 &vp->v_label, cnp);
1937 return (error);
1938}
1939
1940int
1941mac_check_vnode_rename_to(struct ucred *cred, struct vnode *dvp,
1942 struct vnode *vp, int samedir, struct componentname *cnp)
1943{
1944 int error;
1945
1946 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_rename_to");
1947 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_rename_to");
1948
1949 if (!mac_enforce_fs)
1950 return (0);
1951
1952 error = vn_refreshlabel(dvp, cred);
1953 if (error)
1954 return (error);
1955 if (vp != NULL) {
1956 error = vn_refreshlabel(vp, cred);
1957 if (error)
1958 return (error);
1959 }
1960 MAC_CHECK(check_vnode_rename_to, cred, dvp, &dvp->v_label, vp,
1961 vp != NULL ? &vp->v_label : NULL, samedir, cnp);
1962 return (error);
1963}
1964
1965int
1966mac_check_vnode_revoke(struct ucred *cred, struct vnode *vp)
1967{
1968 int error;
1969
1970 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_revoke");
1971
1972 if (!mac_enforce_fs)
1973 return (0);
1974
1975 error = vn_refreshlabel(vp, cred);
1976 if (error)
1977 return (error);
1978
1979 MAC_CHECK(check_vnode_revoke, cred, vp, &vp->v_label);
1980 return (error);
1981}
1982
1983int
1984mac_check_vnode_setacl(struct ucred *cred, struct vnode *vp, acl_type_t type,
1985 struct acl *acl)
1986{
1987 int error;
1988
1989 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setacl");
1990
1991 if (!mac_enforce_fs)
1992 return (0);
1993
1994 error = vn_refreshlabel(vp, cred);
1995 if (error)
1996 return (error);
1997
1998 MAC_CHECK(check_vnode_setacl, cred, vp, &vp->v_label, type, acl);
1999 return (error);
2000}
2001
2002int
2003mac_check_vnode_setextattr(struct ucred *cred, struct vnode *vp,
2004 int attrnamespace, const char *name, struct uio *uio)
2005{
2006 int error;
2007
2008 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setextattr");
2009
2010 if (!mac_enforce_fs)
2011 return (0);
2012
2013 error = vn_refreshlabel(vp, cred);
2014 if (error)
2015 return (error);
2016
2017 MAC_CHECK(check_vnode_setextattr, cred, vp, &vp->v_label,
2018 attrnamespace, name, uio);
2019 return (error);
2020}
2021
2022int
2023mac_check_vnode_setflags(struct ucred *cred, struct vnode *vp, u_long flags)
2024{
2025 int error;
2026
2027 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setflags");
2028
2029 if (!mac_enforce_fs)
2030 return (0);
2031
2032 error = vn_refreshlabel(vp, cred);
2033 if (error)
2034 return (error);
2035
2036 MAC_CHECK(check_vnode_setflags, cred, vp, &vp->v_label, flags);
2037 return (error);
2038}
2039
2040int
2041mac_check_vnode_setmode(struct ucred *cred, struct vnode *vp, mode_t mode)
2042{
2043 int error;
2044
2045 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setmode");
2046
2047 if (!mac_enforce_fs)
2048 return (0);
2049
2050 error = vn_refreshlabel(vp, cred);
2051 if (error)
2052 return (error);
2053
2054 MAC_CHECK(check_vnode_setmode, cred, vp, &vp->v_label, mode);
2055 return (error);
2056}
2057
2058int
2059mac_check_vnode_setowner(struct ucred *cred, struct vnode *vp, uid_t uid,
2060 gid_t gid)
2061{
2062 int error;
2063
2064 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setowner");
2065
2066 if (!mac_enforce_fs)
2067 return (0);
2068
2069 error = vn_refreshlabel(vp, cred);
2070 if (error)
2071 return (error);
2072
2073 MAC_CHECK(check_vnode_setowner, cred, vp, &vp->v_label, uid, gid);
2074 return (error);
2075}
2076
2077int
2078mac_check_vnode_setutimes(struct ucred *cred, struct vnode *vp,
2079 struct timespec atime, struct timespec mtime)
2080{
2081 int error;
2082
2083 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setutimes");
2084
2085 if (!mac_enforce_fs)
2086 return (0);
2087
2088 error = vn_refreshlabel(vp, cred);
2089 if (error)
2090 return (error);
2091
2092 MAC_CHECK(check_vnode_setutimes, cred, vp, &vp->v_label, atime,
2093 mtime);
2094 return (error);
2095}
2096
2097int
2098mac_check_vnode_stat(struct ucred *active_cred, struct ucred *file_cred,
2099 struct vnode *vp)
2100{
2101 int error;
2102
2103 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_stat");
2104
2105 if (!mac_enforce_fs)
2106 return (0);
2107
2108 error = vn_refreshlabel(vp, active_cred);
2109 if (error)
2110 return (error);
2111
2112 MAC_CHECK(check_vnode_stat, active_cred, file_cred, vp,
2113 &vp->v_label);
2114 return (error);
2115}
2116
2117int
2118mac_check_vnode_write(struct ucred *active_cred, struct ucred *file_cred,
2119 struct vnode *vp)
2120{
2121 int error;
2122
2123 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_write");
2124
2125 if (!mac_enforce_fs)
2126 return (0);
2127
2128 error = vn_refreshlabel(vp, active_cred);
2129 if (error)
2130 return (error);
2131
2132 MAC_CHECK(check_vnode_write, active_cred, file_cred, vp,
2133 &vp->v_label);
2134
2135 return (error);
2136}
2137
2138/*
2139 * When relabeling a process, call out to the policies for the maximum
2140 * permission allowed for each object type we know about in its
2141 * memory space, and revoke access (in the least surprising ways we
2142 * know) when necessary. The process lock is not held here.
2143 */
2144static void
2145mac_cred_mmapped_drop_perms(struct thread *td, struct ucred *cred)
2146{
2147
2148 /* XXX freeze all other threads */
2149 mac_cred_mmapped_drop_perms_recurse(td, cred,
2150 &td->td_proc->p_vmspace->vm_map);
2151 /* XXX allow other threads to continue */
2152}
2153
2154static __inline const char *
2155prot2str(vm_prot_t prot)
2156{
2157
2158 switch (prot & VM_PROT_ALL) {
2159 case VM_PROT_READ:
2160 return ("r--");
2161 case VM_PROT_READ | VM_PROT_WRITE:
2162 return ("rw-");
2163 case VM_PROT_READ | VM_PROT_EXECUTE:
2164 return ("r-x");
2165 case VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE:
2166 return ("rwx");
2167 case VM_PROT_WRITE:
2168 return ("-w-");
2169 case VM_PROT_EXECUTE:
2170 return ("--x");
2171 case VM_PROT_WRITE | VM_PROT_EXECUTE:
2172 return ("-wx");
2173 default:
2174 return ("---");
2175 }
2176}
2177
2178static void
2179mac_cred_mmapped_drop_perms_recurse(struct thread *td, struct ucred *cred,
2180 struct vm_map *map)
2181{
2182 struct vm_map_entry *vme;
2183 vm_prot_t result, revokeperms;
2184 vm_object_t object;
2185 vm_ooffset_t offset;
2186 struct vnode *vp;
2187
2188 if (!mac_mmap_revocation)
2189 return;
2190
2191 vm_map_lock_read(map);
2192 for (vme = map->header.next; vme != &map->header; vme = vme->next) {
2193 if (vme->eflags & MAP_ENTRY_IS_SUB_MAP) {
2194 mac_cred_mmapped_drop_perms_recurse(td, cred,
2195 vme->object.sub_map);
2196 continue;
2197 }
2198 /*
2199 * Skip over entries that obviously are not shared.
2200 */
2201 if (vme->eflags & (MAP_ENTRY_COW | MAP_ENTRY_NOSYNC) ||
2202 !vme->max_protection)
2203 continue;
2204 /*
2205 * Drill down to the deepest backing object.
2206 */
2207 offset = vme->offset;
2208 object = vme->object.vm_object;
2209 if (object == NULL)
2210 continue;
2211 while (object->backing_object != NULL) {
2212 object = object->backing_object;
2213 offset += object->backing_object_offset;
2214 }
2215 /*
2216 * At the moment, vm_maps and objects aren't considered
2217 * by the MAC system, so only things with backing by a
2218 * normal object (read: vnodes) are checked.
2219 */
2220 if (object->type != OBJT_VNODE)
2221 continue;
2222 vp = (struct vnode *)object->handle;
2223 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
2224 result = mac_check_vnode_mmap_prot(cred, vp, 0);
2225 VOP_UNLOCK(vp, 0, td);
2226 /*
2227 * Find out what maximum protection we may be allowing
2228 * now but a policy needs to get removed.
2229 */
2230 revokeperms = vme->max_protection & ~result;
2231 if (!revokeperms)
2232 continue;
2233 printf("pid %ld: revoking %s perms from %#lx:%ld "
2234 "(max %s/cur %s)\n", (long)td->td_proc->p_pid,
2235 prot2str(revokeperms), (u_long)vme->start,
2236 (long)(vme->end - vme->start),
2237 prot2str(vme->max_protection), prot2str(vme->protection));
2238 vm_map_lock_upgrade(map);
2239 /*
2240 * This is the really simple case: if a map has more
2241 * max_protection than is allowed, but it's not being
2242 * actually used (that is, the current protection is
2243 * still allowed), we can just wipe it out and do
2244 * nothing more.
2245 */
2246 if ((vme->protection & revokeperms) == 0) {
2247 vme->max_protection -= revokeperms;
2248 } else {
2249 if (revokeperms & VM_PROT_WRITE) {
2250 /*
2251 * In the more complicated case, flush out all
2252 * pending changes to the object then turn it
2253 * copy-on-write.
2254 */
2255 vm_object_reference(object);
2256 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
2257 vm_object_page_clean(object,
2258 OFF_TO_IDX(offset),
2259 OFF_TO_IDX(offset + vme->end - vme->start +
2260 PAGE_MASK),
2261 OBJPC_SYNC);
2262 VOP_UNLOCK(vp, 0, td);
2263 vm_object_deallocate(object);
2264 /*
2265 * Why bother if there's no read permissions
2266 * anymore? For the rest, we need to leave
2267 * the write permissions on for COW, or
2268 * remove them entirely if configured to.
2269 */
2270 if (!mac_mmap_revocation_via_cow) {
2271 vme->max_protection &= ~VM_PROT_WRITE;
2272 vme->protection &= ~VM_PROT_WRITE;
2273 } if ((revokeperms & VM_PROT_READ) == 0)
2274 vme->eflags |= MAP_ENTRY_COW |
2275 MAP_ENTRY_NEEDS_COPY;
2276 }
2277 if (revokeperms & VM_PROT_EXECUTE) {
2278 vme->max_protection &= ~VM_PROT_EXECUTE;
2279 vme->protection &= ~VM_PROT_EXECUTE;
2280 }
2281 if (revokeperms & VM_PROT_READ) {
2282 vme->max_protection = 0;
2283 vme->protection = 0;
2284 }
2285 pmap_protect(map->pmap, vme->start, vme->end,
2286 vme->protection & ~revokeperms);
2287 vm_map_simplify_entry(map, vme);
2288 }
2289 vm_map_lock_downgrade(map);
2290 }
2291 vm_map_unlock_read(map);
2292}
2293
2294/*
2295 * When the subject's label changes, it may require revocation of privilege
2296 * to mapped objects. This can't be done on-the-fly later with a unified
2297 * buffer cache.
2298 */
2299static void
2300mac_relabel_cred(struct ucred *cred, struct label *newlabel)
2301{
2302
2303 MAC_PERFORM(relabel_cred, cred, newlabel);
2304}
2305
2306void
2307mac_relabel_vnode(struct ucred *cred, struct vnode *vp, struct label *newlabel)
2308{
2309
2310 MAC_PERFORM(relabel_vnode, cred, vp, &vp->v_label, newlabel);
2311}
2312
2313void
2314mac_create_ifnet(struct ifnet *ifnet)
2315{
2316
2317 MAC_PERFORM(create_ifnet, ifnet, &ifnet->if_label);
2318}
2319
2320void
2321mac_create_bpfdesc(struct ucred *cred, struct bpf_d *bpf_d)
2322{
2323
2324 MAC_PERFORM(create_bpfdesc, cred, bpf_d, &bpf_d->bd_label);
2325}
2326
2327void
2328mac_create_socket(struct ucred *cred, struct socket *socket)
2329{
2330
2331 MAC_PERFORM(create_socket, cred, socket, &socket->so_label);
2332}
2333
2334void
2335mac_create_pipe(struct ucred *cred, struct pipe *pipe)
2336{
2337
2338 MAC_PERFORM(create_pipe, cred, pipe, pipe->pipe_label);
2339}
2340
2341void
2342mac_create_socket_from_socket(struct socket *oldsocket,
2343 struct socket *newsocket)
2344{
2345
2346 MAC_PERFORM(create_socket_from_socket, oldsocket, &oldsocket->so_label,
2347 newsocket, &newsocket->so_label);
2348}
2349
2350static void
2351mac_relabel_socket(struct ucred *cred, struct socket *socket,
2352 struct label *newlabel)
2353{
2354
2355 MAC_PERFORM(relabel_socket, cred, socket, &socket->so_label, newlabel);
2356}
2357
2358static void
2359mac_relabel_pipe(struct ucred *cred, struct pipe *pipe, struct label *newlabel)
2360{
2361
2362 MAC_PERFORM(relabel_pipe, cred, pipe, pipe->pipe_label, newlabel);
2363}
2364
2365void
2366mac_set_socket_peer_from_mbuf(struct mbuf *mbuf, struct socket *socket)
2367{
2368
2369 MAC_PERFORM(set_socket_peer_from_mbuf, mbuf, &mbuf->m_pkthdr.label,
2370 socket, &socket->so_peerlabel);
2371}
2372
2373void
2374mac_set_socket_peer_from_socket(struct socket *oldsocket,
2375 struct socket *newsocket)
2376{
2377
2378 MAC_PERFORM(set_socket_peer_from_socket, oldsocket,
2379 &oldsocket->so_label, newsocket, &newsocket->so_peerlabel);
2380}
2381
2382void
2383mac_create_datagram_from_ipq(struct ipq *ipq, struct mbuf *datagram)
2384{
2385
2386 MAC_PERFORM(create_datagram_from_ipq, ipq, &ipq->ipq_label,
2387 datagram, &datagram->m_pkthdr.label);
2388}
2389
2390void
2391mac_create_fragment(struct mbuf *datagram, struct mbuf *fragment)
2392{
2393
2394 MAC_PERFORM(create_fragment, datagram, &datagram->m_pkthdr.label,
2395 fragment, &fragment->m_pkthdr.label);
2396}
2397
2398void
2399mac_create_ipq(struct mbuf *fragment, struct ipq *ipq)
2400{
2401
2402 MAC_PERFORM(create_ipq, fragment, &fragment->m_pkthdr.label, ipq,
2403 &ipq->ipq_label);
2404}
2405
2406void
2407mac_create_mbuf_from_mbuf(struct mbuf *oldmbuf, struct mbuf *newmbuf)
2408{
2409
2410 MAC_PERFORM(create_mbuf_from_mbuf, oldmbuf, &oldmbuf->m_pkthdr.label,
2411 newmbuf, &newmbuf->m_pkthdr.label);
2412}
2413
2414void
2415mac_create_mbuf_from_bpfdesc(struct bpf_d *bpf_d, struct mbuf *mbuf)
2416{
2417
2418 MAC_PERFORM(create_mbuf_from_bpfdesc, bpf_d, &bpf_d->bd_label, mbuf,
2419 &mbuf->m_pkthdr.label);
2420}
2421
2422void
2423mac_create_mbuf_linklayer(struct ifnet *ifnet, struct mbuf *mbuf)
2424{
2425
2426 MAC_PERFORM(create_mbuf_linklayer, ifnet, &ifnet->if_label, mbuf,
2427 &mbuf->m_pkthdr.label);
2428}
2429
2430void
2431mac_create_mbuf_from_ifnet(struct ifnet *ifnet, struct mbuf *mbuf)
2432{
2433
2434 MAC_PERFORM(create_mbuf_from_ifnet, ifnet, &ifnet->if_label, mbuf,
2435 &mbuf->m_pkthdr.label);
2436}
2437
2438void
2439mac_create_mbuf_multicast_encap(struct mbuf *oldmbuf, struct ifnet *ifnet,
2440 struct mbuf *newmbuf)
2441{
2442
2443 MAC_PERFORM(create_mbuf_multicast_encap, oldmbuf,
2444 &oldmbuf->m_pkthdr.label, ifnet, &ifnet->if_label, newmbuf,
2445 &newmbuf->m_pkthdr.label);
2446}
2447
2448void
2449mac_create_mbuf_netlayer(struct mbuf *oldmbuf, struct mbuf *newmbuf)
2450{
2451
2452 MAC_PERFORM(create_mbuf_netlayer, oldmbuf, &oldmbuf->m_pkthdr.label,
2453 newmbuf, &newmbuf->m_pkthdr.label);
2454}
2455
2456int
2457mac_fragment_match(struct mbuf *fragment, struct ipq *ipq)
2458{
2459 int result;
2460
2461 result = 1;
2462 MAC_BOOLEAN(fragment_match, &&, fragment, &fragment->m_pkthdr.label,
2463 ipq, &ipq->ipq_label);
2464
2465 return (result);
2466}
2467
2468void
2469mac_update_ipq(struct mbuf *fragment, struct ipq *ipq)
2470{
2471
2472 MAC_PERFORM(update_ipq, fragment, &fragment->m_pkthdr.label, ipq,
2473 &ipq->ipq_label);
2474}
2475
2476void
2477mac_create_mbuf_from_socket(struct socket *socket, struct mbuf *mbuf)
2478{
2479
2480 MAC_PERFORM(create_mbuf_from_socket, socket, &socket->so_label, mbuf,
2481 &mbuf->m_pkthdr.label);
2482}
2483
2484void
2485mac_create_mount(struct ucred *cred, struct mount *mp)
2486{
2487
2488 MAC_PERFORM(create_mount, cred, mp, &mp->mnt_mntlabel,
2489 &mp->mnt_fslabel);
2490}
2491
2492void
2493mac_create_root_mount(struct ucred *cred, struct mount *mp)
2494{
2495
2496 MAC_PERFORM(create_root_mount, cred, mp, &mp->mnt_mntlabel,
2497 &mp->mnt_fslabel);
2498}
2499
2500int
2501mac_check_bpfdesc_receive(struct bpf_d *bpf_d, struct ifnet *ifnet)
2502{
2503 int error;
2504
2505 if (!mac_enforce_network)
2506 return (0);
2507
2508 MAC_CHECK(check_bpfdesc_receive, bpf_d, &bpf_d->bd_label, ifnet,
2509 &ifnet->if_label);
2510
2511 return (error);
2512}
2513
2514static int
2515mac_check_cred_relabel(struct ucred *cred, struct label *newlabel)
2516{
2517 int error;
2518
2519 MAC_CHECK(check_cred_relabel, cred, newlabel);
2520
2521 return (error);
2522}
2523
2524int
2525mac_check_cred_visible(struct ucred *u1, struct ucred *u2)
2526{
2527 int error;
2528
2529 if (!mac_enforce_process)
2530 return (0);
2531
2532 MAC_CHECK(check_cred_visible, u1, u2);
2533
2534 return (error);
2535}
2536
2537int
2538mac_check_ifnet_transmit(struct ifnet *ifnet, struct mbuf *mbuf)
2539{
2540 int error;
2541
2542 if (!mac_enforce_network)
2543 return (0);
2544
2545 KASSERT(mbuf->m_flags & M_PKTHDR, ("packet has no pkthdr"));
2546 if (!(mbuf->m_pkthdr.label.l_flags & MAC_FLAG_INITIALIZED))
2547 printf("%s%d: not initialized\n", ifnet->if_name,
2548 ifnet->if_unit);
2549
2550 MAC_CHECK(check_ifnet_transmit, ifnet, &ifnet->if_label, mbuf,
2551 &mbuf->m_pkthdr.label);
2552
2553 return (error);
2554}
2555
2556int
2557mac_check_mount_stat(struct ucred *cred, struct mount *mount)
2558{
2559 int error;
2560
2561 if (!mac_enforce_fs)
2562 return (0);
2563
2564 MAC_CHECK(check_mount_stat, cred, mount, &mount->mnt_mntlabel);
2565
2566 return (error);
2567}
2568
2569int
2570mac_check_pipe_ioctl(struct ucred *cred, struct pipe *pipe, unsigned long cmd,
2571 void *data)
2572{
2573 int error;
2574
2575 PIPE_LOCK_ASSERT(pipe, MA_OWNED);
2576
2577 if (!mac_enforce_pipe)
2578 return (0);
2579
2580 MAC_CHECK(check_pipe_ioctl, cred, pipe, pipe->pipe_label, cmd, data);
2581
2582 return (error);
2583}
2584
2585int
2586mac_check_pipe_poll(struct ucred *cred, struct pipe *pipe)
2587{
2588 int error;
2589
2590 PIPE_LOCK_ASSERT(pipe, MA_OWNED);
2591
2592 if (!mac_enforce_pipe)
2593 return (0);
2594
2595 MAC_CHECK(check_pipe_poll, cred, pipe, pipe->pipe_label);
2596
2597 return (error);
2598}
2599
2600int
2601mac_check_pipe_read(struct ucred *cred, struct pipe *pipe)
2602{
2603 int error;
2604
2605 PIPE_LOCK_ASSERT(pipe, MA_OWNED);
2606
2607 if (!mac_enforce_pipe)
2608 return (0);
2609
2610 MAC_CHECK(check_pipe_read, cred, pipe, pipe->pipe_label);
2611
2612 return (error);
2613}
2614
2615static int
2616mac_check_pipe_relabel(struct ucred *cred, struct pipe *pipe,
2617 struct label *newlabel)
2618{
2619 int error;
2620
2621 PIPE_LOCK_ASSERT(pipe, MA_OWNED);
2622
2623 if (!mac_enforce_pipe)
2624 return (0);
2625
2626 MAC_CHECK(check_pipe_relabel, cred, pipe, pipe->pipe_label, newlabel);
2627
2628 return (error);
2629}
2630
2631int
2632mac_check_pipe_stat(struct ucred *cred, struct pipe *pipe)
2633{
2634 int error;
2635
2636 PIPE_LOCK_ASSERT(pipe, MA_OWNED);
2637
2638 if (!mac_enforce_pipe)
2639 return (0);
2640
2641 MAC_CHECK(check_pipe_stat, cred, pipe, pipe->pipe_label);
2642
2643 return (error);
2644}
2645
2646int
2647mac_check_pipe_write(struct ucred *cred, struct pipe *pipe)
2648{
2649 int error;
2650
2651 PIPE_LOCK_ASSERT(pipe, MA_OWNED);
2652
2653 if (!mac_enforce_pipe)
2654 return (0);
2655
2656 MAC_CHECK(check_pipe_write, cred, pipe, pipe->pipe_label);
2657
2658 return (error);
2659}
2660
2661int
2662mac_check_proc_debug(struct ucred *cred, struct proc *proc)
2663{
2664 int error;
2665
2666 PROC_LOCK_ASSERT(proc, MA_OWNED);
2667
2668 if (!mac_enforce_process)
2669 return (0);
2670
2671 MAC_CHECK(check_proc_debug, cred, proc);
2672
2673 return (error);
2674}
2675
2676int
2677mac_check_proc_sched(struct ucred *cred, struct proc *proc)
2678{
2679 int error;
2680
2681 PROC_LOCK_ASSERT(proc, MA_OWNED);
2682
2683 if (!mac_enforce_process)
2684 return (0);
2685
2686 MAC_CHECK(check_proc_sched, cred, proc);
2687
2688 return (error);
2689}
2690
2691int
2692mac_check_proc_signal(struct ucred *cred, struct proc *proc, int signum)
2693{
2694 int error;
2695
2696 PROC_LOCK_ASSERT(proc, MA_OWNED);
2697
2698 if (!mac_enforce_process)
2699 return (0);
2700
2701 MAC_CHECK(check_proc_signal, cred, proc, signum);
2702
2703 return (error);
2704}
2705
2706int
2707mac_check_socket_bind(struct ucred *ucred, struct socket *socket,
2708 struct sockaddr *sockaddr)
2709{
2710 int error;
2711
2712 if (!mac_enforce_socket)
2713 return (0);
2714
2715 MAC_CHECK(check_socket_bind, ucred, socket, &socket->so_label,
2716 sockaddr);
2717
2718 return (error);
2719}
2720
2721int
2722mac_check_socket_connect(struct ucred *cred, struct socket *socket,
2723 struct sockaddr *sockaddr)
2724{
2725 int error;
2726
2727 if (!mac_enforce_socket)
2728 return (0);
2729
2730 MAC_CHECK(check_socket_connect, cred, socket, &socket->so_label,
2731 sockaddr);
2732
2733 return (error);
2734}
2735
2736int
2737mac_check_socket_deliver(struct socket *socket, struct mbuf *mbuf)
2738{
2739 int error;
2740
2741 if (!mac_enforce_socket)
2742 return (0);
2743
2744 MAC_CHECK(check_socket_deliver, socket, &socket->so_label, mbuf,
2745 &mbuf->m_pkthdr.label);
2746
2747 return (error);
2748}
2749
2750int
2751mac_check_socket_listen(struct ucred *cred, struct socket *socket)
2752{
2753 int error;
2754
2755 if (!mac_enforce_socket)
2756 return (0);
2757
2758 MAC_CHECK(check_socket_listen, cred, socket, &socket->so_label);
2759 return (error);
2760}
2761
2762static int
2763mac_check_socket_relabel(struct ucred *cred, struct socket *socket,
2764 struct label *newlabel)
2765{
2766 int error;
2767
2768 MAC_CHECK(check_socket_relabel, cred, socket, &socket->so_label,
2769 newlabel);
2770
2771 return (error);
2772}
2773
2774int
2775mac_check_socket_visible(struct ucred *cred, struct socket *socket)
2776{
2777 int error;
2778
2779 if (!mac_enforce_socket)
2780 return (0);
2781
2782 MAC_CHECK(check_socket_visible, cred, socket, &socket->so_label);
2783
2784 return (error);
2785}
2786
2787int
2788mac_ioctl_ifnet_get(struct ucred *cred, struct ifreq *ifr,
2789 struct ifnet *ifnet)
2790{
2791 struct mac label;
2792 int error;
2793
2794 error = mac_externalize(&ifnet->if_label, &label);
2795 if (error)
2796 return (error);
2797
2798 return (copyout(&label, ifr->ifr_ifru.ifru_data, sizeof(label)));
2799}
2800
2801int
2802mac_ioctl_ifnet_set(struct ucred *cred, struct ifreq *ifr,
2803 struct ifnet *ifnet)
2804{
2805 struct mac newlabel;
2806 struct label intlabel;
2807 int error;
2808
2809 error = copyin(ifr->ifr_ifru.ifru_data, &newlabel, sizeof(newlabel));
2810 if (error)
2811 return (error);
2812
2813 error = mac_internalize(&intlabel, &newlabel);
2814 if (error)
2815 return (error);
2816
2817 /*
2818 * XXX: Note that this is a redundant privilege check, since
2819 * policies impose this check themselves if required by the
2820 * policy. Eventually, this should go away.
2821 */
2822 error = suser_cred(cred, 0);
2823 if (error)
2824 goto out;
2825
2826 MAC_CHECK(check_ifnet_relabel, cred, ifnet, &ifnet->if_label,
2827 &intlabel);
2828 if (error)
2829 goto out;
2830
2831 MAC_PERFORM(relabel_ifnet, cred, ifnet, &ifnet->if_label, &intlabel);
2832
2833out:
2834 mac_destroy_temp(&intlabel);
2835 return (error);
2836}
2837
2838void
2839mac_create_devfs_vnode(struct devfs_dirent *de, struct vnode *vp)
2840{
2841
2842 MAC_PERFORM(create_devfs_vnode, de, &de->de_label, vp, &vp->v_label);
2843}
2844
2845void
2846mac_create_devfs_device(dev_t dev, struct devfs_dirent *de)
2847{
2848
2849 MAC_PERFORM(create_devfs_device, dev, de, &de->de_label);
2850}
2851
2852static int
2853mac_stdcreatevnode_ea(struct vnode *vp)
2854{
2855 int error;
2856
2857 MAC_CHECK(stdcreatevnode_ea, vp, &vp->v_label);
2858
2859 return (error);
2860}
2861
2862void
2863mac_create_devfs_directory(char *dirname, int dirnamelen,
2864 struct devfs_dirent *de)
2865{
2866
2867 MAC_PERFORM(create_devfs_directory, dirname, dirnamelen, de,
2868 &de->de_label);
2869}
2870
2871/*
2872 * When a new vnode is created, this call will initialize its label.
2873 */
2874void
2875mac_create_vnode(struct ucred *cred, struct vnode *parent,
2876 struct vnode *child)
2877{
2878 int error;
2879
2880 ASSERT_VOP_LOCKED(parent, "mac_create_vnode");
2881 ASSERT_VOP_LOCKED(child, "mac_create_vnode");
2882
2883 error = vn_refreshlabel(parent, cred);
2884 if (error) {
2885 printf("mac_create_vnode: vn_refreshlabel returned %d\n",
2886 error);
2887 printf("mac_create_vnode: using old vnode label\n");
2888 }
2889
2890 MAC_PERFORM(create_vnode, cred, parent, &parent->v_label, child,
2891 &child->v_label);
2892}
2893
2894int
2895mac_setsockopt_label_set(struct ucred *cred, struct socket *so,
2896 struct mac *extmac)
2897{
2898 struct label intlabel;
2899 int error;
2900
2901 error = mac_internalize(&intlabel, extmac);
2902 if (error)
2903 return (error);
2904
2905 mac_check_socket_relabel(cred, so, &intlabel);
2906 if (error) {
2907 mac_destroy_temp(&intlabel);
2908 return (error);
2909 }
2910
2911 mac_relabel_socket(cred, so, &intlabel);
2912
2913 mac_destroy_temp(&intlabel);
2914 return (0);
2915}
2916
2917int
2918mac_pipe_label_set(struct ucred *cred, struct pipe *pipe, struct label *label)
2919{
2920 int error;
2921
2922 PIPE_LOCK_ASSERT(pipe, MA_OWNED);
2923
2924 error = mac_check_pipe_relabel(cred, pipe, label);
2925 if (error)
2926 return (error);
2927
2928 mac_relabel_pipe(cred, pipe, label);
2929
2930 return (0);
2931}
2932
2933int
2934mac_getsockopt_label_get(struct ucred *cred, struct socket *so,
2935 struct mac *extmac)
2936{
2937
2938 return (mac_externalize(&so->so_label, extmac));
2939}
2940
2941int
2942mac_getsockopt_peerlabel_get(struct ucred *cred, struct socket *so,
2943 struct mac *extmac)
2944{
2945
2946 return (mac_externalize(&so->so_peerlabel, extmac));
2947}
2948
2949/*
2950 * Implementation of VOP_SETLABEL() that relies on extended attributes
2951 * to store label data. Can be referenced by filesystems supporting
2952 * extended attributes.
2953 */
2954int
2955vop_stdsetlabel_ea(struct vop_setlabel_args *ap)
2956{
2957 struct vnode *vp = ap->a_vp;
2958 struct label *intlabel = ap->a_label;
2959 struct mac extmac;
2960 int error;
2961
2962 ASSERT_VOP_LOCKED(vp, "vop_stdsetlabel_ea");
2963
2964 /*
2965 * XXX: Eventually call out to EA check/set calls here.
2966 * Be particularly careful to avoid race conditions,
2967 * consistency problems, and stability problems when
2968 * dealing with multiple EAs. In particular, we require
2969 * the ability to write multiple EAs on the same file in
2970 * a single transaction, which the current EA interface
2971 * does not provide.
2972 */
2973
2974 error = mac_externalize(intlabel, &extmac);
2975 if (error)
2976 return (error);
2977
2978 error = vn_extattr_set(vp, IO_NODELOCKED,
2979 FREEBSD_MAC_EXTATTR_NAMESPACE, FREEBSD_MAC_EXTATTR_NAME,
2980 sizeof(extmac), (char *)&extmac, curthread);
2981 if (error)
2982 return (error);
2983
2984 mac_relabel_vnode(ap->a_cred, vp, intlabel);
2985
2986 vp->v_vflag |= VV_CACHEDLABEL;
2987
2988 return (0);
2989}
2990
2991static int
2992vn_setlabel(struct vnode *vp, struct label *intlabel, struct ucred *cred)
2993{
2994 int error;
2995
2996 if (vp->v_mount == NULL) {
2997 /* printf("vn_setlabel: null v_mount\n"); */
2998 if (vp->v_type != VNON)
2999 printf("vn_setlabel: null v_mount with non-VNON\n");
3000 return (EBADF);
3001 }
3002
3003 if ((vp->v_mount->mnt_flag & MNT_MULTILABEL) == 0)
3004 return (EOPNOTSUPP);
3005
3006 /*
3007 * Multi-phase commit. First check the policies to confirm the
3008 * change is OK. Then commit via the filesystem. Finally,
3009 * update the actual vnode label. Question: maybe the filesystem
3010 * should update the vnode at the end as part of VOP_SETLABEL()?
3011 */
3012 error = mac_check_vnode_relabel(cred, vp, intlabel);
3013 if (error)
3014 return (error);
3015
3016 /*
3017 * VADMIN provides the opportunity for the filesystem to make
3018 * decisions about who is and is not able to modify labels
3019 * and protections on files. This might not be right. We can't
3020 * assume VOP_SETLABEL() will do it, because we might implement
3021 * that as part of vop_stdsetlabel_ea().
3022 */
3023 error = VOP_ACCESS(vp, VADMIN, cred, curthread);
3024 if (error)
3025 return (error);
3026
3027 error = VOP_SETLABEL(vp, intlabel, cred, curthread);
3028 if (error)
3029 return (error);
3030
3031 return (0);
3032}
3033
3034/*
3035 * MPSAFE
3036 */
3037int
3038__mac_get_proc(struct thread *td, struct __mac_get_proc_args *uap)
3039{
3040 struct mac extmac;
3041 int error;
3042
3043 error = mac_externalize(&td->td_ucred->cr_label, &extmac);
3044 if (error == 0)
3045 error = copyout(&extmac, SCARG(uap, mac_p), sizeof(extmac));
3046
3047 return (error);
3048}
3049
3050/*
3051 * MPSAFE
3052 */
3053int
3054__mac_set_proc(struct thread *td, struct __mac_set_proc_args *uap)
3055{
3056 struct ucred *newcred, *oldcred;
3057 struct proc *p;
3058 struct mac extmac;
3059 struct label intlabel;
3060 int error;
3061
3062 error = copyin(SCARG(uap, mac_p), &extmac, sizeof(extmac));
3063 if (error)
3064 return (error);
3065
3066 error = mac_internalize(&intlabel, &extmac);
3067 if (error)
3068 return (error);
3069
3070 newcred = crget();
3071
3072 p = td->td_proc;
3073 PROC_LOCK(p);
3074 oldcred = p->p_ucred;
3075
3076 error = mac_check_cred_relabel(oldcred, &intlabel);
3077 if (error) {
3078 PROC_UNLOCK(p);
3079 mac_destroy_temp(&intlabel);
3080 crfree(newcred);
3081 return (error);
3082 }
3083
3084 setsugid(p);
3085 crcopy(newcred, oldcred);
3086 mac_relabel_cred(newcred, &intlabel);
3087 p->p_ucred = newcred;
3088
3089 /*
3090 * Grab additional reference for use while revoking mmaps, prior
3091 * to releasing the proc lock and sharing the cred.
3092 */
3093 crhold(newcred);
3094 PROC_UNLOCK(p);
3095
3096 mtx_lock(&Giant);
3097 mac_cred_mmapped_drop_perms(td, newcred);
3098 mtx_unlock(&Giant);
3099
3100 crfree(newcred); /* Free revocation reference. */
3101 crfree(oldcred);
3102 mac_destroy_temp(&intlabel);
3103 return (0);
3104}
3105
3106/*
3107 * MPSAFE
3108 */
3109int
3110__mac_get_fd(struct thread *td, struct __mac_get_fd_args *uap)
3111{
3112 struct file *fp;
3113 struct mac extmac;
3114 struct vnode *vp;
3115 struct pipe *pipe;
3116 int error;
3117
3118 mtx_lock(&Giant);
3119
3120 error = fget(td, SCARG(uap, fd), &fp);
3121 if (error)
3122 goto out;
3123
3124 switch (fp->f_type) {
3125 case DTYPE_FIFO:
3126 case DTYPE_VNODE:
3127 vp = (struct vnode *)fp->f_data;
3128
3129 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
3130 error = vn_refreshlabel(vp, td->td_ucred);
3131 if (error == 0)
3132 error = mac_externalize(&vp->v_label, &extmac);
3133 VOP_UNLOCK(vp, 0, td);
3134 break;
3135 case DTYPE_PIPE:
3136 pipe = (struct pipe *)fp->f_data;
3137 error = mac_externalize(pipe->pipe_label, &extmac);
3138 break;
3139 default:
3140 error = EINVAL;
3141 }
3142
3143 if (error == 0)
3144 error = copyout(&extmac, SCARG(uap, mac_p), sizeof(extmac));
3145
3146 fdrop(fp, td);
3147
3148out:
3149 mtx_unlock(&Giant);
3150 return (error);
3151}
3152
3153/*
3154 * MPSAFE
3155 */
3156int
3157__mac_get_file(struct thread *td, struct __mac_get_file_args *uap)
3158{
3159 struct nameidata nd;
3160 struct mac extmac;
3161 int error;
3162
3163 mtx_lock(&Giant);
3164 NDINIT(&nd, LOOKUP, LOCKLEAF | FOLLOW, UIO_USERSPACE,
3165 SCARG(uap, path_p), td);
3166 error = namei(&nd);
3167 if (error)
3168 goto out;
3169
3170 error = vn_refreshlabel(nd.ni_vp, td->td_ucred);
3171 if (error == 0)
3172 error = mac_externalize(&nd.ni_vp->v_label, &extmac);
3173 NDFREE(&nd, 0);
3174 if (error)
3175 goto out;
3176
3177 error = copyout(&extmac, SCARG(uap, mac_p), sizeof(extmac));
3178
3179out:
3180 mtx_unlock(&Giant);
3181 return (error);
3182}
3183
3184/*
3185 * MPSAFE
3186 */
3187int
3188__mac_set_fd(struct thread *td, struct __mac_set_fd_args *uap)
3189{
3190 struct file *fp;
3191 struct mac extmac;
3192 struct label intlabel;
3193 struct mount *mp;
3194 struct vnode *vp;
3195 struct pipe *pipe;
3196 int error;
3197
3198 mtx_lock(&Giant);
3199 error = fget(td, SCARG(uap, fd), &fp);
3200 if (error)
3201 goto out1;
3202
3203 error = copyin(SCARG(uap, mac_p), &extmac, sizeof(extmac));
3204 if (error)
3205 goto out2;
3206
3207 error = mac_internalize(&intlabel, &extmac);
3208 if (error)
3209 goto out2;
3210
3211 switch (fp->f_type) {
3212 case DTYPE_FIFO:
3213 case DTYPE_VNODE:
3214 vp = (struct vnode *)fp->f_data;
3215 error = vn_start_write(vp, &mp, V_WAIT | PCATCH);
3216 if (error != 0)
3217 break;
3218
3219 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
3220 error = vn_setlabel(vp, &intlabel, td->td_ucred);
3221 VOP_UNLOCK(vp, 0, td);
3222 vn_finished_write(mp);
3223 mac_destroy_temp(&intlabel);
3224 break;
3225 case DTYPE_PIPE:
3226 pipe = (struct pipe *)fp->f_data;
3227 PIPE_LOCK(pipe);
3228 error = mac_pipe_label_set(td->td_ucred, pipe, &intlabel);
3229 PIPE_UNLOCK(pipe);
3230 break;
3231 default:
3232 error = EINVAL;
3233 }
3234
3235out2:
3236 fdrop(fp, td);
3237out1:
3238 mtx_unlock(&Giant);
3239 return (error);
3240}
3241
3242/*
3243 * MPSAFE
3244 */
3245int
3246__mac_set_file(struct thread *td, struct __mac_set_file_args *uap)
3247{
3248 struct nameidata nd;
3249 struct mac extmac;
3250 struct label intlabel;
3251 struct mount *mp;
3252 int error;
3253
3254 mtx_lock(&Giant);
3255
3256 error = copyin(SCARG(uap, mac_p), &extmac, sizeof(extmac));
3257 if (error)
3258 goto out;
3259
3260 error = mac_internalize(&intlabel, &extmac);
3261 if (error)
3262 goto out;
3263
3264 NDINIT(&nd, LOOKUP, LOCKLEAF | FOLLOW, UIO_USERSPACE,
3265 SCARG(uap, path_p), td);
3266 error = namei(&nd);
3267 if (error)
3268 goto out2;
3269 error = vn_start_write(nd.ni_vp, &mp, V_WAIT | PCATCH);
3270 if (error)
3271 goto out2;
3272
3273 error = vn_setlabel(nd.ni_vp, &intlabel, td->td_ucred);
3274
3275 vn_finished_write(mp);
3276out2:
3277 mac_destroy_temp(&intlabel);
3278 NDFREE(&nd, 0);
3279out:
3280 mtx_unlock(&Giant);
3281 return (error);
3282}
3283
3284int
3285mac_syscall(struct thread *td, struct mac_syscall_args *uap)
3286{
3287 struct mac_policy_conf *mpc;
3288 char target[MAC_MAX_POLICY_NAME];
3289 int error;
3290
3291 error = copyinstr(SCARG(uap, policy), target, sizeof(target), NULL);
3292 if (error)
3293 return (error);
3294
3295 error = ENOSYS;
3296 MAC_POLICY_LIST_BUSY();
3297 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) {
3298 if (strcmp(mpc->mpc_name, target) == 0 &&
3299 mpc->mpc_ops->mpo_syscall != NULL) {
3300 error = mpc->mpc_ops->mpo_syscall(td,
3301 SCARG(uap, call), SCARG(uap, arg));
3302 goto out;
3303 }
3304 }
3305
3306out:
3307 MAC_POLICY_LIST_UNBUSY();
3308 return (error);
3309}
3310
3311SYSINIT(mac, SI_SUB_MAC, SI_ORDER_FIRST, mac_init, NULL);
3312SYSINIT(mac_late, SI_SUB_MAC_LATE, SI_ORDER_FIRST, mac_late_init, NULL);
3313
3314#else /* !MAC */
3315
3316int
3317__mac_get_proc(struct thread *td, struct __mac_get_proc_args *uap)
3318{
3319
3320 return (ENOSYS);
3321}
3322
3323int
3324__mac_set_proc(struct thread *td, struct __mac_set_proc_args *uap)
3325{
3326
3327 return (ENOSYS);
3328}
3329
3330int
3331__mac_get_fd(struct thread *td, struct __mac_get_fd_args *uap)
3332{
3333
3334 return (ENOSYS);
3335}
3336
3337int
3338__mac_get_file(struct thread *td, struct __mac_get_file_args *uap)
3339{
3340
3341 return (ENOSYS);
3342}
3343
3344int
3345__mac_set_fd(struct thread *td, struct __mac_set_fd_args *uap)
3346{
3347
3348 return (ENOSYS);
3349}
3350
3351int
3352__mac_set_file(struct thread *td, struct __mac_set_file_args *uap)
3353{
3354
3355 return (ENOSYS);
3356}
3357
3358int
3359mac_syscall(struct thread *td, struct mac_syscall_args *uap)
3360{
3361
3362 return (ENOSYS);
3363}
3364
3365#endif /* !MAC */
| 50
51#include <sys/param.h>
52#include <sys/extattr.h>
53#include <sys/kernel.h>
54#include <sys/lock.h>
55#include <sys/malloc.h>
56#include <sys/mutex.h>
57#include <sys/mac.h>
58#include <sys/module.h>
59#include <sys/proc.h>
60#include <sys/systm.h>
61#include <sys/sysproto.h>
62#include <sys/sysent.h>
63#include <sys/vnode.h>
64#include <sys/mount.h>
65#include <sys/file.h>
66#include <sys/namei.h>
67#include <sys/socket.h>
68#include <sys/pipe.h>
69#include <sys/socketvar.h>
70#include <sys/sysctl.h>
71
72#include <vm/vm.h>
73#include <vm/pmap.h>
74#include <vm/vm_map.h>
75#include <vm/vm_object.h>
76
77#include <sys/mac_policy.h>
78
79#include <fs/devfs/devfs.h>
80
81#include <net/bpfdesc.h>
82#include <net/if.h>
83#include <net/if_var.h>
84
85#include <netinet/in.h>
86#include <netinet/ip_var.h>
87
88#ifdef MAC
89
90/*
91 * Declare that the kernel provides MAC support, version 1. This permits
92 * modules to refuse to be loaded if the necessary support isn't present,
93 * even if it's pre-boot.
94 */
95MODULE_VERSION(kernel_mac_support, 1);
96
97SYSCTL_DECL(_security);
98
99SYSCTL_NODE(_security, OID_AUTO, mac, CTLFLAG_RW, 0,
100 "TrustedBSD MAC policy controls");
101#ifndef MAC_MAX_POLICIES
102#define MAC_MAX_POLICIES 8
103#endif
104#if MAC_MAX_POLICIES > 32
105#error "MAC_MAX_POLICIES too large"
106#endif
107static unsigned int mac_max_policies = MAC_MAX_POLICIES;
108static unsigned int mac_policy_offsets_free = (1 << MAC_MAX_POLICIES) - 1;
109SYSCTL_UINT(_security_mac, OID_AUTO, max_policies, CTLFLAG_RD,
110 &mac_max_policies, 0, "");
111
112static int mac_late = 0;
113
114static int mac_enforce_fs = 1;
115SYSCTL_INT(_security_mac, OID_AUTO, enforce_fs, CTLFLAG_RW,
116 &mac_enforce_fs, 0, "Enforce MAC policy on file system objects");
117TUNABLE_INT("security.mac.enforce_fs", &mac_enforce_fs);
118
119static int mac_enforce_network = 1;
120SYSCTL_INT(_security_mac, OID_AUTO, enforce_network, CTLFLAG_RW,
121 &mac_enforce_network, 0, "Enforce MAC policy on network packets");
122TUNABLE_INT("security.mac.enforce_network", &mac_enforce_network);
123
124static int mac_enforce_pipe = 1;
125SYSCTL_INT(_security_mac, OID_AUTO, enforce_pipe, CTLFLAG_RW,
126 &mac_enforce_pipe, 0, "Enforce MAC policy on pipe operations");
127TUNABLE_INT("security.mac.enforce_pipe", &mac_enforce_pipe);
128
129static int mac_enforce_process = 1;
130SYSCTL_INT(_security_mac, OID_AUTO, enforce_process, CTLFLAG_RW,
131 &mac_enforce_process, 0, "Enforce MAC policy on inter-process operations");
132TUNABLE_INT("security.mac.enforce_process", &mac_enforce_process);
133
134static int mac_enforce_socket = 1;
135SYSCTL_INT(_security_mac, OID_AUTO, enforce_socket, CTLFLAG_RW,
136 &mac_enforce_socket, 0, "Enforce MAC policy on socket operations");
137TUNABLE_INT("security.mac.enforce_socket", &mac_enforce_socket);
138
139static int mac_enforce_vm = 1;
140SYSCTL_INT(_security_mac, OID_AUTO, enforce_vm, CTLFLAG_RW,
141 &mac_enforce_vm, 0, "Enforce MAC policy on vm operations");
142TUNABLE_INT("security.mac.enforce_vm", &mac_enforce_vm);
143
144static int mac_label_size = sizeof(struct mac);
145SYSCTL_INT(_security_mac, OID_AUTO, label_size, CTLFLAG_RD,
146 &mac_label_size, 0, "Pre-compiled MAC label size");
147
148static int mac_cache_fslabel_in_vnode = 1;
149SYSCTL_INT(_security_mac, OID_AUTO, cache_fslabel_in_vnode, CTLFLAG_RW,
150 &mac_cache_fslabel_in_vnode, 0, "Cache mount fslabel in vnode");
151TUNABLE_INT("security.mac.cache_fslabel_in_vnode",
152 &mac_cache_fslabel_in_vnode);
153
154static int mac_vnode_label_cache_hits = 0;
155SYSCTL_INT(_security_mac, OID_AUTO, vnode_label_cache_hits, CTLFLAG_RD,
156 &mac_vnode_label_cache_hits, 0, "Cache hits on vnode labels");
157static int mac_vnode_label_cache_misses = 0;
158SYSCTL_INT(_security_mac, OID_AUTO, vnode_label_cache_misses, CTLFLAG_RD,
159 &mac_vnode_label_cache_misses, 0, "Cache misses on vnode labels");
160
161static int mac_mmap_revocation = 1;
162SYSCTL_INT(_security_mac, OID_AUTO, mmap_revocation, CTLFLAG_RW,
163 &mac_mmap_revocation, 0, "Revoke mmap access to files on subject "
164 "relabel");
165static int mac_mmap_revocation_via_cow = 0;
166SYSCTL_INT(_security_mac, OID_AUTO, mmap_revocation_via_cow, CTLFLAG_RW,
167 &mac_mmap_revocation_via_cow, 0, "Revoke mmap access to files via "
168 "copy-on-write semantics, or by removing all write access");
169
170#ifdef MAC_DEBUG
171SYSCTL_NODE(_security_mac, OID_AUTO, debug, CTLFLAG_RW, 0,
172 "TrustedBSD MAC debug info");
173
174static int mac_debug_label_fallback = 0;
175SYSCTL_INT(_security_mac_debug, OID_AUTO, label_fallback, CTLFLAG_RW,
176 &mac_debug_label_fallback, 0, "Filesystems should fall back to fs label"
177 "when label is corrupted.");
178TUNABLE_INT("security.mac.debug_label_fallback",
179 &mac_debug_label_fallback);
180
181static unsigned int nmacmbufs, nmaccreds, nmacifnets, nmacbpfdescs,
182 nmacsockets, nmacmounts, nmactemp, nmacvnodes, nmacdevfsdirents,
183 nmacipqs, nmacpipes;
184SYSCTL_UINT(_security_mac_debug, OID_AUTO, mbufs, CTLFLAG_RD,
185 &nmacmbufs, 0, "number of mbufs in use");
186SYSCTL_UINT(_security_mac_debug, OID_AUTO, creds, CTLFLAG_RD,
187 &nmaccreds, 0, "number of ucreds in use");
188SYSCTL_UINT(_security_mac_debug, OID_AUTO, ifnets, CTLFLAG_RD,
189 &nmacifnets, 0, "number of ifnets in use");
190SYSCTL_UINT(_security_mac_debug, OID_AUTO, ipqs, CTLFLAG_RD,
191 &nmacipqs, 0, "number of ipqs in use");
192SYSCTL_UINT(_security_mac_debug, OID_AUTO, bpfdescs, CTLFLAG_RD,
193 &nmacbpfdescs, 0, "number of bpfdescs in use");
194SYSCTL_UINT(_security_mac_debug, OID_AUTO, sockets, CTLFLAG_RD,
195 &nmacsockets, 0, "number of sockets in use");
196SYSCTL_UINT(_security_mac_debug, OID_AUTO, pipes, CTLFLAG_RD,
197 &nmacpipes, 0, "number of pipes in use");
198SYSCTL_UINT(_security_mac_debug, OID_AUTO, mounts, CTLFLAG_RD,
199 &nmacmounts, 0, "number of mounts in use");
200SYSCTL_UINT(_security_mac_debug, OID_AUTO, temp, CTLFLAG_RD,
201 &nmactemp, 0, "number of temporary labels in use");
202SYSCTL_UINT(_security_mac_debug, OID_AUTO, vnodes, CTLFLAG_RD,
203 &nmacvnodes, 0, "number of vnodes in use");
204SYSCTL_UINT(_security_mac_debug, OID_AUTO, devfsdirents, CTLFLAG_RD,
205 &nmacdevfsdirents, 0, "number of devfs dirents inuse");
206#endif
207
208static int error_select(int error1, int error2);
209static int mac_externalize(struct label *label, struct mac *mac);
210static int mac_policy_register(struct mac_policy_conf *mpc);
211static int mac_policy_unregister(struct mac_policy_conf *mpc);
212
213static int mac_stdcreatevnode_ea(struct vnode *vp);
214static void mac_cred_mmapped_drop_perms(struct thread *td,
215 struct ucred *cred);
216static void mac_cred_mmapped_drop_perms_recurse(struct thread *td,
217 struct ucred *cred, struct vm_map *map);
218
219MALLOC_DEFINE(M_MACOPVEC, "macopvec", "MAC policy operation vector");
220MALLOC_DEFINE(M_MACPIPELABEL, "macpipelabel", "MAC labels for pipes");
221
222/*
223 * mac_policy_list_lock protects the consistency of 'mac_policy_list',
224 * the linked list of attached policy modules. Read-only consumers of
225 * the list must acquire a shared lock for the duration of their use;
226 * writers must acquire an exclusive lock. Note that for compound
227 * operations, locks should be held for the entire compound operation,
228 * and that this is not yet done for relabel requests.
229 */
230static struct mtx mac_policy_list_lock;
231static LIST_HEAD(, mac_policy_conf) mac_policy_list;
232static int mac_policy_list_busy;
233#define MAC_POLICY_LIST_LOCKINIT() mtx_init(&mac_policy_list_lock, \
234 "mac_policy_list_lock", NULL, MTX_DEF);
235#define MAC_POLICY_LIST_LOCK() mtx_lock(&mac_policy_list_lock);
236#define MAC_POLICY_LIST_UNLOCK() mtx_unlock(&mac_policy_list_lock);
237
238#define MAC_POLICY_LIST_BUSY() do { \
239 MAC_POLICY_LIST_LOCK(); \
240 mac_policy_list_busy++; \
241 MAC_POLICY_LIST_UNLOCK(); \
242} while (0)
243
244#define MAC_POLICY_LIST_UNBUSY() do { \
245 MAC_POLICY_LIST_LOCK(); \
246 mac_policy_list_busy--; \
247 if (mac_policy_list_busy < 0) \
248 panic("Extra mac_policy_list_busy--"); \
249 MAC_POLICY_LIST_UNLOCK(); \
250} while (0)
251
252/*
253 * MAC_CHECK performs the designated check by walking the policy
254 * module list and checking with each as to how it feels about the
255 * request. Note that it returns its value via 'error' in the scope
256 * of the caller.
257 */
258#define MAC_CHECK(check, args...) do { \
259 struct mac_policy_conf *mpc; \
260 \
261 error = 0; \
262 MAC_POLICY_LIST_BUSY(); \
263 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \
264 if (mpc->mpc_ops->mpo_ ## check != NULL) \
265 error = error_select( \
266 mpc->mpc_ops->mpo_ ## check (args), \
267 error); \
268 } \
269 MAC_POLICY_LIST_UNBUSY(); \
270} while (0)
271
272/*
273 * MAC_BOOLEAN performs the designated boolean composition by walking
274 * the module list, invoking each instance of the operation, and
275 * combining the results using the passed C operator. Note that it
276 * returns its value via 'result' in the scope of the caller, which
277 * should be initialized by the caller in a meaningful way to get
278 * a meaningful result.
279 */
280#define MAC_BOOLEAN(operation, composition, args...) do { \
281 struct mac_policy_conf *mpc; \
282 \
283 MAC_POLICY_LIST_BUSY(); \
284 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \
285 if (mpc->mpc_ops->mpo_ ## operation != NULL) \
286 result = result composition \
287 mpc->mpc_ops->mpo_ ## operation (args); \
288 } \
289 MAC_POLICY_LIST_UNBUSY(); \
290} while (0)
291
292/*
293 * MAC_PERFORM performs the designated operation by walking the policy
294 * module list and invoking that operation for each policy.
295 */
296#define MAC_PERFORM(operation, args...) do { \
297 struct mac_policy_conf *mpc; \
298 \
299 MAC_POLICY_LIST_BUSY(); \
300 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \
301 if (mpc->mpc_ops->mpo_ ## operation != NULL) \
302 mpc->mpc_ops->mpo_ ## operation (args); \
303 } \
304 MAC_POLICY_LIST_UNBUSY(); \
305} while (0)
306
307/*
308 * Initialize the MAC subsystem, including appropriate SMP locks.
309 */
310static void
311mac_init(void)
312{
313
314 LIST_INIT(&mac_policy_list);
315 MAC_POLICY_LIST_LOCKINIT();
316}
317
318/*
319 * For the purposes of modules that want to know if they were loaded
320 * "early", set the mac_late flag once we've processed modules either
321 * linked into the kernel, or loaded before the kernel startup.
322 */
323static void
324mac_late_init(void)
325{
326
327 mac_late = 1;
328}
329
330/*
331 * Allow MAC policy modules to register during boot, etc.
332 */
333int
334mac_policy_modevent(module_t mod, int type, void *data)
335{
336 struct mac_policy_conf *mpc;
337 int error;
338
339 error = 0;
340 mpc = (struct mac_policy_conf *) data;
341
342 switch (type) {
343 case MOD_LOAD:
344 if (mpc->mpc_loadtime_flags & MPC_LOADTIME_FLAG_NOTLATE &&
345 mac_late) {
346 printf("mac_policy_modevent: can't load %s policy "
347 "after booting\n", mpc->mpc_name);
348 error = EBUSY;
349 break;
350 }
351 error = mac_policy_register(mpc);
352 break;
353 case MOD_UNLOAD:
354 /* Don't unregister the module if it was never registered. */
355 if ((mpc->mpc_runtime_flags & MPC_RUNTIME_FLAG_REGISTERED)
356 != 0)
357 error = mac_policy_unregister(mpc);
358 else
359 error = 0;
360 break;
361 default:
362 break;
363 }
364
365 return (error);
366}
367
368static int
369mac_policy_register(struct mac_policy_conf *mpc)
370{
371 struct mac_policy_conf *tmpc;
372 struct mac_policy_op_entry *mpe;
373 int slot;
374
375 MALLOC(mpc->mpc_ops, struct mac_policy_ops *, sizeof(*mpc->mpc_ops),
376 M_MACOPVEC, M_WAITOK | M_ZERO);
377 for (mpe = mpc->mpc_entries; mpe->mpe_constant != MAC_OP_LAST; mpe++) {
378 switch (mpe->mpe_constant) {
379 case MAC_OP_LAST:
380 /*
381 * Doesn't actually happen, but this allows checking
382 * that all enumerated values are handled.
383 */
384 break;
385 case MAC_DESTROY:
386 mpc->mpc_ops->mpo_destroy =
387 mpe->mpe_function;
388 break;
389 case MAC_INIT:
390 mpc->mpc_ops->mpo_init =
391 mpe->mpe_function;
392 break;
393 case MAC_SYSCALL:
394 mpc->mpc_ops->mpo_syscall =
395 mpe->mpe_function;
396 break;
397 case MAC_INIT_BPFDESC:
398 mpc->mpc_ops->mpo_init_bpfdesc =
399 mpe->mpe_function;
400 break;
401 case MAC_INIT_CRED:
402 mpc->mpc_ops->mpo_init_cred =
403 mpe->mpe_function;
404 break;
405 case MAC_INIT_DEVFSDIRENT:
406 mpc->mpc_ops->mpo_init_devfsdirent =
407 mpe->mpe_function;
408 break;
409 case MAC_INIT_IFNET:
410 mpc->mpc_ops->mpo_init_ifnet =
411 mpe->mpe_function;
412 break;
413 case MAC_INIT_IPQ:
414 mpc->mpc_ops->mpo_init_ipq =
415 mpe->mpe_function;
416 break;
417 case MAC_INIT_MBUF:
418 mpc->mpc_ops->mpo_init_mbuf =
419 mpe->mpe_function;
420 break;
421 case MAC_INIT_MOUNT:
422 mpc->mpc_ops->mpo_init_mount =
423 mpe->mpe_function;
424 break;
425 case MAC_INIT_PIPE:
426 mpc->mpc_ops->mpo_init_pipe =
427 mpe->mpe_function;
428 break;
429 case MAC_INIT_SOCKET:
430 mpc->mpc_ops->mpo_init_socket =
431 mpe->mpe_function;
432 break;
433 case MAC_INIT_TEMP:
434 mpc->mpc_ops->mpo_init_temp =
435 mpe->mpe_function;
436 break;
437 case MAC_INIT_VNODE:
438 mpc->mpc_ops->mpo_init_vnode =
439 mpe->mpe_function;
440 break;
441 case MAC_DESTROY_BPFDESC:
442 mpc->mpc_ops->mpo_destroy_bpfdesc =
443 mpe->mpe_function;
444 break;
445 case MAC_DESTROY_CRED:
446 mpc->mpc_ops->mpo_destroy_cred =
447 mpe->mpe_function;
448 break;
449 case MAC_DESTROY_DEVFSDIRENT:
450 mpc->mpc_ops->mpo_destroy_devfsdirent =
451 mpe->mpe_function;
452 break;
453 case MAC_DESTROY_IFNET:
454 mpc->mpc_ops->mpo_destroy_ifnet =
455 mpe->mpe_function;
456 break;
457 case MAC_DESTROY_IPQ:
458 mpc->mpc_ops->mpo_destroy_ipq =
459 mpe->mpe_function;
460 break;
461 case MAC_DESTROY_MBUF:
462 mpc->mpc_ops->mpo_destroy_mbuf =
463 mpe->mpe_function;
464 break;
465 case MAC_DESTROY_MOUNT:
466 mpc->mpc_ops->mpo_destroy_mount =
467 mpe->mpe_function;
468 break;
469 case MAC_DESTROY_PIPE:
470 mpc->mpc_ops->mpo_destroy_pipe =
471 mpe->mpe_function;
472 break;
473 case MAC_DESTROY_SOCKET:
474 mpc->mpc_ops->mpo_destroy_socket =
475 mpe->mpe_function;
476 break;
477 case MAC_DESTROY_TEMP:
478 mpc->mpc_ops->mpo_destroy_temp =
479 mpe->mpe_function;
480 break;
481 case MAC_DESTROY_VNODE:
482 mpc->mpc_ops->mpo_destroy_vnode =
483 mpe->mpe_function;
484 break;
485 case MAC_EXTERNALIZE:
486 mpc->mpc_ops->mpo_externalize =
487 mpe->mpe_function;
488 break;
489 case MAC_INTERNALIZE:
490 mpc->mpc_ops->mpo_internalize =
491 mpe->mpe_function;
492 break;
493 case MAC_CREATE_DEVFS_DEVICE:
494 mpc->mpc_ops->mpo_create_devfs_device =
495 mpe->mpe_function;
496 break;
497 case MAC_CREATE_DEVFS_DIRECTORY:
498 mpc->mpc_ops->mpo_create_devfs_directory =
499 mpe->mpe_function;
500 break;
501 case MAC_CREATE_DEVFS_VNODE:
502 mpc->mpc_ops->mpo_create_devfs_vnode =
503 mpe->mpe_function;
504 break;
505 case MAC_STDCREATEVNODE_EA:
506 mpc->mpc_ops->mpo_stdcreatevnode_ea =
507 mpe->mpe_function;
508 break;
509 case MAC_CREATE_VNODE:
510 mpc->mpc_ops->mpo_create_vnode =
511 mpe->mpe_function;
512 break;
513 case MAC_CREATE_MOUNT:
514 mpc->mpc_ops->mpo_create_mount =
515 mpe->mpe_function;
516 break;
517 case MAC_CREATE_ROOT_MOUNT:
518 mpc->mpc_ops->mpo_create_root_mount =
519 mpe->mpe_function;
520 break;
521 case MAC_RELABEL_VNODE:
522 mpc->mpc_ops->mpo_relabel_vnode =
523 mpe->mpe_function;
524 break;
525 case MAC_UPDATE_DEVFSDIRENT:
526 mpc->mpc_ops->mpo_update_devfsdirent =
527 mpe->mpe_function;
528 break;
529 case MAC_UPDATE_PROCFSVNODE:
530 mpc->mpc_ops->mpo_update_procfsvnode =
531 mpe->mpe_function;
532 break;
533 case MAC_UPDATE_VNODE_FROM_EXTATTR:
534 mpc->mpc_ops->mpo_update_vnode_from_extattr =
535 mpe->mpe_function;
536 break;
537 case MAC_UPDATE_VNODE_FROM_EXTERNALIZED:
538 mpc->mpc_ops->mpo_update_vnode_from_externalized =
539 mpe->mpe_function;
540 break;
541 case MAC_UPDATE_VNODE_FROM_MOUNT:
542 mpc->mpc_ops->mpo_update_vnode_from_mount =
543 mpe->mpe_function;
544 break;
545 case MAC_CREATE_MBUF_FROM_SOCKET:
546 mpc->mpc_ops->mpo_create_mbuf_from_socket =
547 mpe->mpe_function;
548 break;
549 case MAC_CREATE_PIPE:
550 mpc->mpc_ops->mpo_create_pipe =
551 mpe->mpe_function;
552 break;
553 case MAC_CREATE_SOCKET:
554 mpc->mpc_ops->mpo_create_socket =
555 mpe->mpe_function;
556 break;
557 case MAC_CREATE_SOCKET_FROM_SOCKET:
558 mpc->mpc_ops->mpo_create_socket_from_socket =
559 mpe->mpe_function;
560 break;
561 case MAC_RELABEL_PIPE:
562 mpc->mpc_ops->mpo_relabel_pipe =
563 mpe->mpe_function;
564 break;
565 case MAC_RELABEL_SOCKET:
566 mpc->mpc_ops->mpo_relabel_socket =
567 mpe->mpe_function;
568 break;
569 case MAC_SET_SOCKET_PEER_FROM_MBUF:
570 mpc->mpc_ops->mpo_set_socket_peer_from_mbuf =
571 mpe->mpe_function;
572 break;
573 case MAC_SET_SOCKET_PEER_FROM_SOCKET:
574 mpc->mpc_ops->mpo_set_socket_peer_from_socket =
575 mpe->mpe_function;
576 break;
577 case MAC_CREATE_BPFDESC:
578 mpc->mpc_ops->mpo_create_bpfdesc =
579 mpe->mpe_function;
580 break;
581 case MAC_CREATE_DATAGRAM_FROM_IPQ:
582 mpc->mpc_ops->mpo_create_datagram_from_ipq =
583 mpe->mpe_function;
584 break;
585 case MAC_CREATE_FRAGMENT:
586 mpc->mpc_ops->mpo_create_fragment =
587 mpe->mpe_function;
588 break;
589 case MAC_CREATE_IFNET:
590 mpc->mpc_ops->mpo_create_ifnet =
591 mpe->mpe_function;
592 break;
593 case MAC_CREATE_IPQ:
594 mpc->mpc_ops->mpo_create_ipq =
595 mpe->mpe_function;
596 break;
597 case MAC_CREATE_MBUF_FROM_MBUF:
598 mpc->mpc_ops->mpo_create_mbuf_from_mbuf =
599 mpe->mpe_function;
600 break;
601 case MAC_CREATE_MBUF_LINKLAYER:
602 mpc->mpc_ops->mpo_create_mbuf_linklayer =
603 mpe->mpe_function;
604 break;
605 case MAC_CREATE_MBUF_FROM_BPFDESC:
606 mpc->mpc_ops->mpo_create_mbuf_from_bpfdesc =
607 mpe->mpe_function;
608 break;
609 case MAC_CREATE_MBUF_FROM_IFNET:
610 mpc->mpc_ops->mpo_create_mbuf_from_ifnet =
611 mpe->mpe_function;
612 break;
613 case MAC_CREATE_MBUF_MULTICAST_ENCAP:
614 mpc->mpc_ops->mpo_create_mbuf_multicast_encap =
615 mpe->mpe_function;
616 break;
617 case MAC_CREATE_MBUF_NETLAYER:
618 mpc->mpc_ops->mpo_create_mbuf_netlayer =
619 mpe->mpe_function;
620 break;
621 case MAC_FRAGMENT_MATCH:
622 mpc->mpc_ops->mpo_fragment_match =
623 mpe->mpe_function;
624 break;
625 case MAC_RELABEL_IFNET:
626 mpc->mpc_ops->mpo_relabel_ifnet =
627 mpe->mpe_function;
628 break;
629 case MAC_UPDATE_IPQ:
630 mpc->mpc_ops->mpo_update_ipq =
631 mpe->mpe_function;
632 break;
633 case MAC_CREATE_CRED:
634 mpc->mpc_ops->mpo_create_cred =
635 mpe->mpe_function;
636 break;
637 case MAC_EXECVE_TRANSITION:
638 mpc->mpc_ops->mpo_execve_transition =
639 mpe->mpe_function;
640 break;
641 case MAC_EXECVE_WILL_TRANSITION:
642 mpc->mpc_ops->mpo_execve_will_transition =
643 mpe->mpe_function;
644 break;
645 case MAC_CREATE_PROC0:
646 mpc->mpc_ops->mpo_create_proc0 = mpe->mpe_function;
647 break;
648 case MAC_CREATE_PROC1:
649 mpc->mpc_ops->mpo_create_proc1 = mpe->mpe_function;
650 break;
651 case MAC_RELABEL_CRED:
652 mpc->mpc_ops->mpo_relabel_cred =
653 mpe->mpe_function;
654 break;
655 case MAC_CHECK_BPFDESC_RECEIVE:
656 mpc->mpc_ops->mpo_check_bpfdesc_receive =
657 mpe->mpe_function;
658 break;
659 case MAC_CHECK_CRED_RELABEL:
660 mpc->mpc_ops->mpo_check_cred_relabel =
661 mpe->mpe_function;
662 break;
663 case MAC_CHECK_CRED_VISIBLE:
664 mpc->mpc_ops->mpo_check_cred_visible =
665 mpe->mpe_function;
666 break;
667 case MAC_CHECK_IFNET_RELABEL:
668 mpc->mpc_ops->mpo_check_ifnet_relabel =
669 mpe->mpe_function;
670 break;
671 case MAC_CHECK_IFNET_TRANSMIT:
672 mpc->mpc_ops->mpo_check_ifnet_transmit =
673 mpe->mpe_function;
674 break;
675 case MAC_CHECK_MOUNT_STAT:
676 mpc->mpc_ops->mpo_check_mount_stat =
677 mpe->mpe_function;
678 break;
679 case MAC_CHECK_PIPE_IOCTL:
680 mpc->mpc_ops->mpo_check_pipe_ioctl =
681 mpe->mpe_function;
682 break;
683 case MAC_CHECK_PIPE_POLL:
684 mpc->mpc_ops->mpo_check_pipe_poll =
685 mpe->mpe_function;
686 break;
687 case MAC_CHECK_PIPE_READ:
688 mpc->mpc_ops->mpo_check_pipe_read =
689 mpe->mpe_function;
690 break;
691 case MAC_CHECK_PIPE_RELABEL:
692 mpc->mpc_ops->mpo_check_pipe_relabel =
693 mpe->mpe_function;
694 break;
695 case MAC_CHECK_PIPE_STAT:
696 mpc->mpc_ops->mpo_check_pipe_stat =
697 mpe->mpe_function;
698 break;
699 case MAC_CHECK_PIPE_WRITE:
700 mpc->mpc_ops->mpo_check_pipe_write =
701 mpe->mpe_function;
702 break;
703 case MAC_CHECK_PROC_DEBUG:
704 mpc->mpc_ops->mpo_check_proc_debug =
705 mpe->mpe_function;
706 break;
707 case MAC_CHECK_PROC_SCHED:
708 mpc->mpc_ops->mpo_check_proc_sched =
709 mpe->mpe_function;
710 break;
711 case MAC_CHECK_PROC_SIGNAL:
712 mpc->mpc_ops->mpo_check_proc_signal =
713 mpe->mpe_function;
714 break;
715 case MAC_CHECK_SOCKET_BIND:
716 mpc->mpc_ops->mpo_check_socket_bind =
717 mpe->mpe_function;
718 break;
719 case MAC_CHECK_SOCKET_CONNECT:
720 mpc->mpc_ops->mpo_check_socket_connect =
721 mpe->mpe_function;
722 break;
723 case MAC_CHECK_SOCKET_DELIVER:
724 mpc->mpc_ops->mpo_check_socket_deliver =
725 mpe->mpe_function;
726 break;
727 case MAC_CHECK_SOCKET_LISTEN:
728 mpc->mpc_ops->mpo_check_socket_listen =
729 mpe->mpe_function;
730 break;
731 case MAC_CHECK_SOCKET_RELABEL:
732 mpc->mpc_ops->mpo_check_socket_relabel =
733 mpe->mpe_function;
734 break;
735 case MAC_CHECK_SOCKET_VISIBLE:
736 mpc->mpc_ops->mpo_check_socket_visible =
737 mpe->mpe_function;
738 break;
739 case MAC_CHECK_VNODE_ACCESS:
740 mpc->mpc_ops->mpo_check_vnode_access =
741 mpe->mpe_function;
742 break;
743 case MAC_CHECK_VNODE_CHDIR:
744 mpc->mpc_ops->mpo_check_vnode_chdir =
745 mpe->mpe_function;
746 break;
747 case MAC_CHECK_VNODE_CHROOT:
748 mpc->mpc_ops->mpo_check_vnode_chroot =
749 mpe->mpe_function;
750 break;
751 case MAC_CHECK_VNODE_CREATE:
752 mpc->mpc_ops->mpo_check_vnode_create =
753 mpe->mpe_function;
754 break;
755 case MAC_CHECK_VNODE_DELETE:
756 mpc->mpc_ops->mpo_check_vnode_delete =
757 mpe->mpe_function;
758 break;
759 case MAC_CHECK_VNODE_DELETEACL:
760 mpc->mpc_ops->mpo_check_vnode_deleteacl =
761 mpe->mpe_function;
762 break;
763 case MAC_CHECK_VNODE_EXEC:
764 mpc->mpc_ops->mpo_check_vnode_exec =
765 mpe->mpe_function;
766 break;
767 case MAC_CHECK_VNODE_GETACL:
768 mpc->mpc_ops->mpo_check_vnode_getacl =
769 mpe->mpe_function;
770 break;
771 case MAC_CHECK_VNODE_GETEXTATTR:
772 mpc->mpc_ops->mpo_check_vnode_getextattr =
773 mpe->mpe_function;
774 break;
775 case MAC_CHECK_VNODE_LOOKUP:
776 mpc->mpc_ops->mpo_check_vnode_lookup =
777 mpe->mpe_function;
778 break;
779 case MAC_CHECK_VNODE_MMAP_PERMS:
780 mpc->mpc_ops->mpo_check_vnode_mmap_perms =
781 mpe->mpe_function;
782 break;
783 case MAC_CHECK_VNODE_OPEN:
784 mpc->mpc_ops->mpo_check_vnode_open =
785 mpe->mpe_function;
786 break;
787 case MAC_CHECK_VNODE_POLL:
788 mpc->mpc_ops->mpo_check_vnode_poll =
789 mpe->mpe_function;
790 break;
791 case MAC_CHECK_VNODE_READ:
792 mpc->mpc_ops->mpo_check_vnode_read =
793 mpe->mpe_function;
794 break;
795 case MAC_CHECK_VNODE_READDIR:
796 mpc->mpc_ops->mpo_check_vnode_readdir =
797 mpe->mpe_function;
798 break;
799 case MAC_CHECK_VNODE_READLINK:
800 mpc->mpc_ops->mpo_check_vnode_readlink =
801 mpe->mpe_function;
802 break;
803 case MAC_CHECK_VNODE_RELABEL:
804 mpc->mpc_ops->mpo_check_vnode_relabel =
805 mpe->mpe_function;
806 break;
807 case MAC_CHECK_VNODE_RENAME_FROM:
808 mpc->mpc_ops->mpo_check_vnode_rename_from =
809 mpe->mpe_function;
810 break;
811 case MAC_CHECK_VNODE_RENAME_TO:
812 mpc->mpc_ops->mpo_check_vnode_rename_to =
813 mpe->mpe_function;
814 break;
815 case MAC_CHECK_VNODE_REVOKE:
816 mpc->mpc_ops->mpo_check_vnode_revoke =
817 mpe->mpe_function;
818 break;
819 case MAC_CHECK_VNODE_SETACL:
820 mpc->mpc_ops->mpo_check_vnode_setacl =
821 mpe->mpe_function;
822 break;
823 case MAC_CHECK_VNODE_SETEXTATTR:
824 mpc->mpc_ops->mpo_check_vnode_setextattr =
825 mpe->mpe_function;
826 break;
827 case MAC_CHECK_VNODE_SETFLAGS:
828 mpc->mpc_ops->mpo_check_vnode_setflags =
829 mpe->mpe_function;
830 break;
831 case MAC_CHECK_VNODE_SETMODE:
832 mpc->mpc_ops->mpo_check_vnode_setmode =
833 mpe->mpe_function;
834 break;
835 case MAC_CHECK_VNODE_SETOWNER:
836 mpc->mpc_ops->mpo_check_vnode_setowner =
837 mpe->mpe_function;
838 break;
839 case MAC_CHECK_VNODE_SETUTIMES:
840 mpc->mpc_ops->mpo_check_vnode_setutimes =
841 mpe->mpe_function;
842 break;
843 case MAC_CHECK_VNODE_STAT:
844 mpc->mpc_ops->mpo_check_vnode_stat =
845 mpe->mpe_function;
846 break;
847 case MAC_CHECK_VNODE_WRITE:
848 mpc->mpc_ops->mpo_check_vnode_write =
849 mpe->mpe_function;
850 break;
851/*
852 default:
853 printf("MAC policy `%s': unknown operation %d\n",
854 mpc->mpc_name, mpe->mpe_constant);
855 return (EINVAL);
856*/
857 }
858 }
859 MAC_POLICY_LIST_LOCK();
860 if (mac_policy_list_busy > 0) {
861 MAC_POLICY_LIST_UNLOCK();
862 FREE(mpc->mpc_ops, M_MACOPVEC);
863 mpc->mpc_ops = NULL;
864 return (EBUSY);
865 }
866 LIST_FOREACH(tmpc, &mac_policy_list, mpc_list) {
867 if (strcmp(tmpc->mpc_name, mpc->mpc_name) == 0) {
868 MAC_POLICY_LIST_UNLOCK();
869 FREE(mpc->mpc_ops, M_MACOPVEC);
870 mpc->mpc_ops = NULL;
871 return (EEXIST);
872 }
873 }
874 if (mpc->mpc_field_off != NULL) {
875 slot = ffs(mac_policy_offsets_free);
876 if (slot == 0) {
877 MAC_POLICY_LIST_UNLOCK();
878 FREE(mpc->mpc_ops, M_MACOPVEC);
879 mpc->mpc_ops = NULL;
880 return (ENOMEM);
881 }
882 slot--;
883 mac_policy_offsets_free &= ~(1 << slot);
884 *mpc->mpc_field_off = slot;
885 }
886 mpc->mpc_runtime_flags |= MPC_RUNTIME_FLAG_REGISTERED;
887 LIST_INSERT_HEAD(&mac_policy_list, mpc, mpc_list);
888
889 /* Per-policy initialization. */
890 if (mpc->mpc_ops->mpo_init != NULL)
891 (*(mpc->mpc_ops->mpo_init))(mpc);
892 MAC_POLICY_LIST_UNLOCK();
893
894 printf("Security policy loaded: %s (%s)\n", mpc->mpc_fullname,
895 mpc->mpc_name);
896
897 return (0);
898}
899
900static int
901mac_policy_unregister(struct mac_policy_conf *mpc)
902{
903
904#if 0
905 /*
906 * Don't allow unloading modules with private data.
907 */
908 if (mpc->mpc_field_off != NULL)
909 return (EBUSY);
910#endif
911 if ((mpc->mpc_loadtime_flags & MPC_LOADTIME_FLAG_UNLOADOK) == 0)
912 return (EBUSY);
913 MAC_POLICY_LIST_LOCK();
914 if (mac_policy_list_busy > 0) {
915 MAC_POLICY_LIST_UNLOCK();
916 return (EBUSY);
917 }
918 if (mpc->mpc_ops->mpo_destroy != NULL)
919 (*(mpc->mpc_ops->mpo_destroy))(mpc);
920
921 LIST_REMOVE(mpc, mpc_list);
922 MAC_POLICY_LIST_UNLOCK();
923
924 FREE(mpc->mpc_ops, M_MACOPVEC);
925 mpc->mpc_ops = NULL;
926
927 printf("Security policy unload: %s (%s)\n", mpc->mpc_fullname,
928 mpc->mpc_name);
929
930 return (0);
931}
932
933/*
934 * Define an error value precedence, and given two arguments, selects the
935 * value with the higher precedence.
936 */
937static int
938error_select(int error1, int error2)
939{
940
941 /* Certain decision-making errors take top priority. */
942 if (error1 == EDEADLK || error2 == EDEADLK)
943 return (EDEADLK);
944
945 /* Invalid arguments should be reported where possible. */
946 if (error1 == EINVAL || error2 == EINVAL)
947 return (EINVAL);
948
949 /* Precedence goes to "visibility", with both process and file. */
950 if (error1 == ESRCH || error2 == ESRCH)
951 return (ESRCH);
952
953 if (error1 == ENOENT || error2 == ENOENT)
954 return (ENOENT);
955
956 /* Precedence goes to DAC/MAC protections. */
957 if (error1 == EACCES || error2 == EACCES)
958 return (EACCES);
959
960 /* Precedence goes to privilege. */
961 if (error1 == EPERM || error2 == EPERM)
962 return (EPERM);
963
964 /* Precedence goes to error over success; otherwise, arbitrary. */
965 if (error1 != 0)
966 return (error1);
967 return (error2);
968}
969
970void
971mac_update_devfsdirent(struct devfs_dirent *de, struct vnode *vp)
972{
973
974 MAC_PERFORM(update_devfsdirent, de, &de->de_label, vp, &vp->v_label);
975}
976
977void
978mac_update_procfsvnode(struct vnode *vp, struct ucred *cred)
979{
980
981 MAC_PERFORM(update_procfsvnode, vp, &vp->v_label, cred);
982}
983
984/*
985 * Support callout for policies that manage their own externalization
986 * using extended attributes.
987 */
988static int
989mac_update_vnode_from_extattr(struct vnode *vp, struct mount *mp)
990{
991 int error;
992
993 MAC_CHECK(update_vnode_from_extattr, vp, &vp->v_label, mp,
994 &mp->mnt_fslabel);
995
996 return (error);
997}
998
999/*
1000 * Given an externalized mac label, internalize it and stamp it on a
1001 * vnode.
1002 */
1003static int
1004mac_update_vnode_from_externalized(struct vnode *vp, struct mac *extmac)
1005{
1006 int error;
1007
1008 MAC_CHECK(update_vnode_from_externalized, vp, &vp->v_label, extmac);
1009
1010 return (error);
1011}
1012
1013/*
1014 * Call out to individual policies to update the label in a vnode from
1015 * the mountpoint.
1016 */
1017void
1018mac_update_vnode_from_mount(struct vnode *vp, struct mount *mp)
1019{
1020
1021 MAC_PERFORM(update_vnode_from_mount, vp, &vp->v_label, mp,
1022 &mp->mnt_fslabel);
1023
1024 ASSERT_VOP_LOCKED(vp, "mac_update_vnode_from_mount");
1025 if (mac_cache_fslabel_in_vnode)
1026 vp->v_vflag |= VV_CACHEDLABEL;
1027}
1028
1029/*
1030 * Implementation of VOP_REFRESHLABEL() that relies on extended attributes
1031 * to store label data. Can be referenced by filesystems supporting
1032 * extended attributes.
1033 */
1034int
1035vop_stdrefreshlabel_ea(struct vop_refreshlabel_args *ap)
1036{
1037 struct vnode *vp = ap->a_vp;
1038 struct mac extmac;
1039 int buflen, error;
1040
1041 ASSERT_VOP_LOCKED(vp, "vop_stdrefreshlabel_ea");
1042
1043 /*
1044 * Call out to external policies first. Order doesn't really
1045 * matter, as long as failure of one assures failure of all.
1046 */
1047 error = mac_update_vnode_from_extattr(vp, vp->v_mount);
1048 if (error)
1049 return (error);
1050
1051 buflen = sizeof(extmac);
1052 error = vn_extattr_get(vp, IO_NODELOCKED,
1053 FREEBSD_MAC_EXTATTR_NAMESPACE, FREEBSD_MAC_EXTATTR_NAME, &buflen,
1054 (char *)&extmac, curthread);
1055 switch (error) {
1056 case 0:
1057 /* Got it */
1058 break;
1059
1060 case ENOATTR:
1061 /*
1062 * Use the label from the mount point.
1063 */
1064 mac_update_vnode_from_mount(vp, vp->v_mount);
1065 return (0);
1066
1067 case EOPNOTSUPP:
1068 default:
1069 /* Fail horribly. */
1070 return (error);
1071 }
1072
1073 if (buflen != sizeof(extmac))
1074 error = EPERM; /* Fail very closed. */
1075 if (error == 0)
1076 error = mac_update_vnode_from_externalized(vp, &extmac);
1077 if (error == 0)
1078 vp->v_vflag |= VV_CACHEDLABEL;
1079 else {
1080 struct vattr va;
1081
1082 printf("Corrupted label on %s",
1083 vp->v_mount->mnt_stat.f_mntonname);
1084 if (VOP_GETATTR(vp, &va, curthread->td_ucred, curthread) == 0)
1085 printf(" inum %ld", va.va_fileid);
1086#ifdef MAC_DEBUG
1087 if (mac_debug_label_fallback) {
1088 printf(", falling back.\n");
1089 mac_update_vnode_from_mount(vp, vp->v_mount);
1090 error = 0;
1091 } else {
1092#endif
1093 printf(".\n");
1094 error = EPERM;
1095#ifdef MAC_DEBUG
1096 }
1097#endif
1098 }
1099
1100 return (error);
1101}
1102
1103/*
1104 * Make sure the vnode label is up-to-date. If EOPNOTSUPP, then we handle
1105 * the labeling activity outselves. Filesystems should be careful not
1106 * to change their minds regarding whether they support vop_refreshlabel()
1107 * for a vnode or not. Don't cache the vnode here, allow the file
1108 * system code to determine if it's safe to cache. If we update from
1109 * the mount, don't cache since a change to the mount label should affect
1110 * all vnodes.
1111 */
1112static int
1113vn_refreshlabel(struct vnode *vp, struct ucred *cred)
1114{
1115 int error;
1116
1117 ASSERT_VOP_LOCKED(vp, "vn_refreshlabel");
1118
1119 if (vp->v_mount == NULL) {
1120/*
1121 Eventually, we probably want to special-case refreshing
1122 of deadfs vnodes, and if there's a lock-free race somewhere,
1123 that case might be handled here.
1124
1125 mac_update_vnode_deadfs(vp);
1126 return (0);
1127 */
1128 /* printf("vn_refreshlabel: null v_mount\n"); */
1129 if (vp->v_type != VNON)
1130 printf(
1131 "vn_refreshlabel: null v_mount with non-VNON\n");
1132 return (EBADF);
1133 }
1134
1135 if (vp->v_vflag & VV_CACHEDLABEL) {
1136 mac_vnode_label_cache_hits++;
1137 return (0);
1138 } else
1139 mac_vnode_label_cache_misses++;
1140
1141 if ((vp->v_mount->mnt_flag & MNT_MULTILABEL) == 0) {
1142 mac_update_vnode_from_mount(vp, vp->v_mount);
1143 return (0);
1144 }
1145
1146 error = VOP_REFRESHLABEL(vp, cred, curthread);
1147 switch (error) {
1148 case EOPNOTSUPP:
1149 /*
1150 * If labels are not supported on this vnode, fall back to
1151 * the label in the mount and propagate it to the vnode.
1152 * There should probably be some sort of policy/flag/decision
1153 * about doing this.
1154 */
1155 mac_update_vnode_from_mount(vp, vp->v_mount);
1156 error = 0;
1157 default:
1158 return (error);
1159 }
1160}
1161
1162/*
1163 * Helper function for file systems using the vop_std*_ea() calls. This
1164 * function must be called after EA service is available for the vnode,
1165 * but before it's hooked up to the namespace so that the node persists
1166 * if there's a crash, or before it can be accessed. On successful
1167 * commit of the label to disk (etc), do cache the label.
1168 */
1169int
1170vop_stdcreatevnode_ea(struct vnode *dvp, struct vnode *tvp, struct ucred *cred)
1171{
1172 struct mac extmac;
1173 int error;
1174
1175 ASSERT_VOP_LOCKED(tvp, "vop_stdcreatevnode_ea");
1176 if ((dvp->v_mount->mnt_flag & MNT_MULTILABEL) == 0) {
1177 mac_update_vnode_from_mount(tvp, tvp->v_mount);
1178 } else {
1179 error = vn_refreshlabel(dvp, cred);
1180 if (error)
1181 return (error);
1182
1183 /*
1184 * Stick the label in the vnode. Then try to write to
1185 * disk. If we fail, return a failure to abort the
1186 * create operation. Really, this failure shouldn't
1187 * happen except in fairly unusual circumstances (out
1188 * of disk, etc).
1189 */
1190 mac_create_vnode(cred, dvp, tvp);
1191
1192 error = mac_stdcreatevnode_ea(tvp);
1193 if (error)
1194 return (error);
1195
1196 /*
1197 * XXX: Eventually this will go away and all policies will
1198 * directly manage their extended attributes.
1199 */
1200 error = mac_externalize(&tvp->v_label, &extmac);
1201 if (error)
1202 return (error);
1203
1204 error = vn_extattr_set(tvp, IO_NODELOCKED,
1205 FREEBSD_MAC_EXTATTR_NAMESPACE, FREEBSD_MAC_EXTATTR_NAME,
1206 sizeof(extmac), (char *)&extmac, curthread);
1207 if (error == 0)
1208 tvp->v_vflag |= VV_CACHEDLABEL;
1209 else {
1210#if 0
1211 /*
1212 * In theory, we could have fall-back behavior here.
1213 * It would probably be incorrect.
1214 */
1215#endif
1216 return (error);
1217 }
1218 }
1219
1220 return (0);
1221}
1222
1223void
1224mac_execve_transition(struct ucred *old, struct ucred *new, struct vnode *vp)
1225{
1226 int error;
1227
1228 ASSERT_VOP_LOCKED(vp, "mac_execve_transition");
1229
1230 error = vn_refreshlabel(vp, old);
1231 if (error) {
1232 printf("mac_execve_transition: vn_refreshlabel returned %d\n",
1233 error);
1234 printf("mac_execve_transition: using old vnode label\n");
1235 }
1236
1237 MAC_PERFORM(execve_transition, old, new, vp, &vp->v_label);
1238}
1239
1240int
1241mac_execve_will_transition(struct ucred *old, struct vnode *vp)
1242{
1243 int error, result;
1244
1245 error = vn_refreshlabel(vp, old);
1246 if (error)
1247 return (error);
1248
1249 result = 0;
1250 MAC_BOOLEAN(execve_will_transition, ||, old, vp, &vp->v_label);
1251
1252 return (result);
1253}
1254
1255static void
1256mac_init_label(struct label *label)
1257{
1258
1259 bzero(label, sizeof(*label));
1260 label->l_flags = MAC_FLAG_INITIALIZED;
1261}
1262
1263static void
1264mac_init_structmac(struct mac *mac)
1265{
1266
1267 bzero(mac, sizeof(*mac));
1268 mac->m_macflags = MAC_FLAG_INITIALIZED;
1269}
1270
1271static void
1272mac_destroy_label(struct label *label)
1273{
1274
1275 KASSERT(label->l_flags & MAC_FLAG_INITIALIZED,
1276 ("destroying uninitialized label"));
1277
1278 bzero(label, sizeof(*label));
1279 /* implicit: label->l_flags &= ~MAC_FLAG_INITIALIZED; */
1280}
1281
1282int
1283mac_init_mbuf(struct mbuf *m, int how)
1284{
1285 KASSERT(m->m_flags & M_PKTHDR, ("mac_init_mbuf on non-header mbuf"));
1286
1287 /* "how" is one of M_(TRY|DONT)WAIT */
1288 mac_init_label(&m->m_pkthdr.label);
1289 MAC_PERFORM(init_mbuf, m, how, &m->m_pkthdr.label);
1290#ifdef MAC_DEBUG
1291 atomic_add_int(&nmacmbufs, 1);
1292#endif
1293 return (0);
1294}
1295
1296void
1297mac_destroy_mbuf(struct mbuf *m)
1298{
1299
1300 MAC_PERFORM(destroy_mbuf, m, &m->m_pkthdr.label);
1301 mac_destroy_label(&m->m_pkthdr.label);
1302#ifdef MAC_DEBUG
1303 atomic_subtract_int(&nmacmbufs, 1);
1304#endif
1305}
1306
1307void
1308mac_init_cred(struct ucred *cr)
1309{
1310
1311 mac_init_label(&cr->cr_label);
1312 MAC_PERFORM(init_cred, cr, &cr->cr_label);
1313#ifdef MAC_DEBUG
1314 atomic_add_int(&nmaccreds, 1);
1315#endif
1316}
1317
1318void
1319mac_destroy_cred(struct ucred *cr)
1320{
1321
1322 MAC_PERFORM(destroy_cred, cr, &cr->cr_label);
1323 mac_destroy_label(&cr->cr_label);
1324#ifdef MAC_DEBUG
1325 atomic_subtract_int(&nmaccreds, 1);
1326#endif
1327}
1328
1329void
1330mac_init_ifnet(struct ifnet *ifp)
1331{
1332
1333 mac_init_label(&ifp->if_label);
1334 MAC_PERFORM(init_ifnet, ifp, &ifp->if_label);
1335#ifdef MAC_DEBUG
1336 atomic_add_int(&nmacifnets, 1);
1337#endif
1338}
1339
1340void
1341mac_destroy_ifnet(struct ifnet *ifp)
1342{
1343
1344 MAC_PERFORM(destroy_ifnet, ifp, &ifp->if_label);
1345 mac_destroy_label(&ifp->if_label);
1346#ifdef MAC_DEBUG
1347 atomic_subtract_int(&nmacifnets, 1);
1348#endif
1349}
1350
1351void
1352mac_init_ipq(struct ipq *ipq)
1353{
1354
1355 mac_init_label(&ipq->ipq_label);
1356 MAC_PERFORM(init_ipq, ipq, &ipq->ipq_label);
1357#ifdef MAC_DEBUG
1358 atomic_add_int(&nmacipqs, 1);
1359#endif
1360}
1361
1362void
1363mac_destroy_ipq(struct ipq *ipq)
1364{
1365
1366 MAC_PERFORM(destroy_ipq, ipq, &ipq->ipq_label);
1367 mac_destroy_label(&ipq->ipq_label);
1368#ifdef MAC_DEBUG
1369 atomic_subtract_int(&nmacipqs, 1);
1370#endif
1371}
1372
1373void
1374mac_init_socket(struct socket *socket)
1375{
1376
1377 mac_init_label(&socket->so_label);
1378 mac_init_label(&socket->so_peerlabel);
1379 MAC_PERFORM(init_socket, socket, &socket->so_label,
1380 &socket->so_peerlabel);
1381#ifdef MAC_DEBUG
1382 atomic_add_int(&nmacsockets, 1);
1383#endif
1384}
1385
1386void
1387mac_destroy_socket(struct socket *socket)
1388{
1389
1390 MAC_PERFORM(destroy_socket, socket, &socket->so_label,
1391 &socket->so_peerlabel);
1392 mac_destroy_label(&socket->so_label);
1393 mac_destroy_label(&socket->so_peerlabel);
1394#ifdef MAC_DEBUG
1395 atomic_subtract_int(&nmacsockets, 1);
1396#endif
1397}
1398
1399void
1400mac_init_pipe(struct pipe *pipe)
1401{
1402 struct label *label;
1403
1404 label = malloc(sizeof(struct label), M_MACPIPELABEL, M_ZERO|M_WAITOK);
1405 mac_init_label(label);
1406 pipe->pipe_label = label;
1407 pipe->pipe_peer->pipe_label = label;
1408 MAC_PERFORM(init_pipe, pipe, pipe->pipe_label);
1409#ifdef MAC_DEBUG
1410 atomic_add_int(&nmacpipes, 1);
1411#endif
1412}
1413
1414void
1415mac_destroy_pipe(struct pipe *pipe)
1416{
1417
1418 MAC_PERFORM(destroy_pipe, pipe, pipe->pipe_label);
1419 mac_destroy_label(pipe->pipe_label);
1420 free(pipe->pipe_label, M_MACPIPELABEL);
1421#ifdef MAC_DEBUG
1422 atomic_subtract_int(&nmacpipes, 1);
1423#endif
1424}
1425
1426void
1427mac_init_bpfdesc(struct bpf_d *bpf_d)
1428{
1429
1430 mac_init_label(&bpf_d->bd_label);
1431 MAC_PERFORM(init_bpfdesc, bpf_d, &bpf_d->bd_label);
1432#ifdef MAC_DEBUG
1433 atomic_add_int(&nmacbpfdescs, 1);
1434#endif
1435}
1436
1437void
1438mac_destroy_bpfdesc(struct bpf_d *bpf_d)
1439{
1440
1441 MAC_PERFORM(destroy_bpfdesc, bpf_d, &bpf_d->bd_label);
1442 mac_destroy_label(&bpf_d->bd_label);
1443#ifdef MAC_DEBUG
1444 atomic_subtract_int(&nmacbpfdescs, 1);
1445#endif
1446}
1447
1448void
1449mac_init_mount(struct mount *mp)
1450{
1451
1452 mac_init_label(&mp->mnt_mntlabel);
1453 mac_init_label(&mp->mnt_fslabel);
1454 MAC_PERFORM(init_mount, mp, &mp->mnt_mntlabel, &mp->mnt_fslabel);
1455#ifdef MAC_DEBUG
1456 atomic_add_int(&nmacmounts, 1);
1457#endif
1458}
1459
1460void
1461mac_destroy_mount(struct mount *mp)
1462{
1463
1464 MAC_PERFORM(destroy_mount, mp, &mp->mnt_mntlabel, &mp->mnt_fslabel);
1465 mac_destroy_label(&mp->mnt_fslabel);
1466 mac_destroy_label(&mp->mnt_mntlabel);
1467#ifdef MAC_DEBUG
1468 atomic_subtract_int(&nmacmounts, 1);
1469#endif
1470}
1471
1472static void
1473mac_init_temp(struct label *label)
1474{
1475
1476 mac_init_label(label);
1477 MAC_PERFORM(init_temp, label);
1478#ifdef MAC_DEBUG
1479 atomic_add_int(&nmactemp, 1);
1480#endif
1481}
1482
1483static void
1484mac_destroy_temp(struct label *label)
1485{
1486
1487 MAC_PERFORM(destroy_temp, label);
1488 mac_destroy_label(label);
1489#ifdef MAC_DEBUG
1490 atomic_subtract_int(&nmactemp, 1);
1491#endif
1492}
1493
1494void
1495mac_init_vnode(struct vnode *vp)
1496{
1497
1498 mac_init_label(&vp->v_label);
1499 MAC_PERFORM(init_vnode, vp, &vp->v_label);
1500#ifdef MAC_DEBUG
1501 atomic_add_int(&nmacvnodes, 1);
1502#endif
1503}
1504
1505void
1506mac_destroy_vnode(struct vnode *vp)
1507{
1508
1509 MAC_PERFORM(destroy_vnode, vp, &vp->v_label);
1510 mac_destroy_label(&vp->v_label);
1511#ifdef MAC_DEBUG
1512 atomic_subtract_int(&nmacvnodes, 1);
1513#endif
1514}
1515
1516void
1517mac_init_devfsdirent(struct devfs_dirent *de)
1518{
1519
1520 mac_init_label(&de->de_label);
1521 MAC_PERFORM(init_devfsdirent, de, &de->de_label);
1522#ifdef MAC_DEBUG
1523 atomic_add_int(&nmacdevfsdirents, 1);
1524#endif
1525}
1526
1527void
1528mac_destroy_devfsdirent(struct devfs_dirent *de)
1529{
1530
1531 MAC_PERFORM(destroy_devfsdirent, de, &de->de_label);
1532 mac_destroy_label(&de->de_label);
1533#ifdef MAC_DEBUG
1534 atomic_subtract_int(&nmacdevfsdirents, 1);
1535#endif
1536}
1537
1538static int
1539mac_externalize(struct label *label, struct mac *mac)
1540{
1541 int error;
1542
1543 mac_init_structmac(mac);
1544 MAC_CHECK(externalize, label, mac);
1545
1546 return (error);
1547}
1548
1549static int
1550mac_internalize(struct label *label, struct mac *mac)
1551{
1552 int error;
1553
1554 mac_init_temp(label);
1555 MAC_CHECK(internalize, label, mac);
1556 if (error)
1557 mac_destroy_temp(label);
1558
1559 return (error);
1560}
1561
1562/*
1563 * Initialize MAC label for the first kernel process, from which other
1564 * kernel processes and threads are spawned.
1565 */
1566void
1567mac_create_proc0(struct ucred *cred)
1568{
1569
1570 MAC_PERFORM(create_proc0, cred);
1571}
1572
1573/*
1574 * Initialize MAC label for the first userland process, from which other
1575 * userland processes and threads are spawned.
1576 */
1577void
1578mac_create_proc1(struct ucred *cred)
1579{
1580
1581 MAC_PERFORM(create_proc1, cred);
1582}
1583
1584/*
1585 * When a new process is created, its label must be initialized. Generally,
1586 * this involves inheritence from the parent process, modulo possible
1587 * deltas. This function allows that processing to take place.
1588 */
1589void
1590mac_create_cred(struct ucred *parent_cred, struct ucred *child_cred)
1591{
1592
1593 MAC_PERFORM(create_cred, parent_cred, child_cred);
1594}
1595
1596int
1597mac_check_vnode_access(struct ucred *cred, struct vnode *vp, int flags)
1598{
1599 int error;
1600
1601 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_access");
1602
1603 if (!mac_enforce_fs)
1604 return (0);
1605
1606 error = vn_refreshlabel(vp, cred);
1607 if (error)
1608 return (error);
1609
1610 MAC_CHECK(check_vnode_access, cred, vp, &vp->v_label, flags);
1611 return (error);
1612}
1613
1614int
1615mac_check_vnode_chdir(struct ucred *cred, struct vnode *dvp)
1616{
1617 int error;
1618
1619 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_chdir");
1620
1621 if (!mac_enforce_fs)
1622 return (0);
1623
1624 error = vn_refreshlabel(dvp, cred);
1625 if (error)
1626 return (error);
1627
1628 MAC_CHECK(check_vnode_chdir, cred, dvp, &dvp->v_label);
1629 return (error);
1630}
1631
1632int
1633mac_check_vnode_chroot(struct ucred *cred, struct vnode *dvp)
1634{
1635 int error;
1636
1637 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_chroot");
1638
1639 if (!mac_enforce_fs)
1640 return (0);
1641
1642 error = vn_refreshlabel(dvp, cred);
1643 if (error)
1644 return (error);
1645
1646 MAC_CHECK(check_vnode_chroot, cred, dvp, &dvp->v_label);
1647 return (error);
1648}
1649
1650int
1651mac_check_vnode_create(struct ucred *cred, struct vnode *dvp,
1652 struct componentname *cnp, struct vattr *vap)
1653{
1654 int error;
1655
1656 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_create");
1657
1658 if (!mac_enforce_fs)
1659 return (0);
1660
1661 error = vn_refreshlabel(dvp, cred);
1662 if (error)
1663 return (error);
1664
1665 MAC_CHECK(check_vnode_create, cred, dvp, &dvp->v_label, cnp, vap);
1666 return (error);
1667}
1668
1669int
1670mac_check_vnode_delete(struct ucred *cred, struct vnode *dvp, struct vnode *vp,
1671 struct componentname *cnp)
1672{
1673 int error;
1674
1675 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_delete");
1676 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_delete");
1677
1678 if (!mac_enforce_fs)
1679 return (0);
1680
1681 error = vn_refreshlabel(dvp, cred);
1682 if (error)
1683 return (error);
1684 error = vn_refreshlabel(vp, cred);
1685 if (error)
1686 return (error);
1687
1688 MAC_CHECK(check_vnode_delete, cred, dvp, &dvp->v_label, vp,
1689 &vp->v_label, cnp);
1690 return (error);
1691}
1692
1693int
1694mac_check_vnode_deleteacl(struct ucred *cred, struct vnode *vp,
1695 acl_type_t type)
1696{
1697 int error;
1698
1699 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_deleteacl");
1700
1701 if (!mac_enforce_fs)
1702 return (0);
1703
1704 error = vn_refreshlabel(vp, cred);
1705 if (error)
1706 return (error);
1707
1708 MAC_CHECK(check_vnode_deleteacl, cred, vp, &vp->v_label, type);
1709 return (error);
1710}
1711
1712int
1713mac_check_vnode_exec(struct ucred *cred, struct vnode *vp)
1714{
1715 int error;
1716
1717 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_exec");
1718
1719 if (!mac_enforce_process && !mac_enforce_fs)
1720 return (0);
1721
1722 error = vn_refreshlabel(vp, cred);
1723 if (error)
1724 return (error);
1725 MAC_CHECK(check_vnode_exec, cred, vp, &vp->v_label);
1726
1727 return (error);
1728}
1729
1730int
1731mac_check_vnode_getacl(struct ucred *cred, struct vnode *vp, acl_type_t type)
1732{
1733 int error;
1734
1735 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_getacl");
1736
1737 if (!mac_enforce_fs)
1738 return (0);
1739
1740 error = vn_refreshlabel(vp, cred);
1741 if (error)
1742 return (error);
1743
1744 MAC_CHECK(check_vnode_getacl, cred, vp, &vp->v_label, type);
1745 return (error);
1746}
1747
1748int
1749mac_check_vnode_getextattr(struct ucred *cred, struct vnode *vp,
1750 int attrnamespace, const char *name, struct uio *uio)
1751{
1752 int error;
1753
1754 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_getextattr");
1755
1756 if (!mac_enforce_fs)
1757 return (0);
1758
1759 error = vn_refreshlabel(vp, cred);
1760 if (error)
1761 return (error);
1762
1763 MAC_CHECK(check_vnode_getextattr, cred, vp, &vp->v_label,
1764 attrnamespace, name, uio);
1765 return (error);
1766}
1767
1768int
1769mac_check_vnode_lookup(struct ucred *cred, struct vnode *dvp,
1770 struct componentname *cnp)
1771{
1772 int error;
1773
1774 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_lookup");
1775
1776 if (!mac_enforce_fs)
1777 return (0);
1778
1779 error = vn_refreshlabel(dvp, cred);
1780 if (error)
1781 return (error);
1782
1783 MAC_CHECK(check_vnode_lookup, cred, dvp, &dvp->v_label, cnp);
1784 return (error);
1785}
1786
1787vm_prot_t
1788mac_check_vnode_mmap_prot(struct ucred *cred, struct vnode *vp, int newmapping)
1789{
1790 vm_prot_t result = VM_PROT_ALL;
1791
1792 if (!mac_enforce_vm)
1793 return (result);
1794
1795 /*
1796 * This should be some sort of MAC_BITWISE, maybe :)
1797 */
1798 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mmap_perms");
1799 MAC_BOOLEAN(check_vnode_mmap_perms, &, cred, vp, &vp->v_label,
1800 newmapping);
1801 return (result);
1802}
1803
1804int
1805mac_check_vnode_open(struct ucred *cred, struct vnode *vp, mode_t acc_mode)
1806{
1807 int error;
1808
1809 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_open");
1810
1811 if (!mac_enforce_fs)
1812 return (0);
1813
1814 error = vn_refreshlabel(vp, cred);
1815 if (error)
1816 return (error);
1817
1818 MAC_CHECK(check_vnode_open, cred, vp, &vp->v_label, acc_mode);
1819 return (error);
1820}
1821
1822int
1823mac_check_vnode_poll(struct ucred *active_cred, struct ucred *file_cred,
1824 struct vnode *vp)
1825{
1826 int error;
1827
1828 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_poll");
1829
1830 if (!mac_enforce_fs)
1831 return (0);
1832
1833 error = vn_refreshlabel(vp, active_cred);
1834 if (error)
1835 return (error);
1836
1837 MAC_CHECK(check_vnode_poll, active_cred, file_cred, vp,
1838 &vp->v_label);
1839
1840 return (error);
1841}
1842
1843int
1844mac_check_vnode_read(struct ucred *active_cred, struct ucred *file_cred,
1845 struct vnode *vp)
1846{
1847 int error;
1848
1849 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_read");
1850
1851 if (!mac_enforce_fs)
1852 return (0);
1853
1854 error = vn_refreshlabel(vp, active_cred);
1855 if (error)
1856 return (error);
1857
1858 MAC_CHECK(check_vnode_read, active_cred, file_cred, vp,
1859 &vp->v_label);
1860
1861 return (error);
1862}
1863
1864int
1865mac_check_vnode_readdir(struct ucred *cred, struct vnode *dvp)
1866{
1867 int error;
1868
1869 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_readdir");
1870
1871 if (!mac_enforce_fs)
1872 return (0);
1873
1874 error = vn_refreshlabel(dvp, cred);
1875 if (error)
1876 return (error);
1877
1878 MAC_CHECK(check_vnode_readdir, cred, dvp, &dvp->v_label);
1879 return (error);
1880}
1881
1882int
1883mac_check_vnode_readlink(struct ucred *cred, struct vnode *vp)
1884{
1885 int error;
1886
1887 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_readlink");
1888
1889 if (!mac_enforce_fs)
1890 return (0);
1891
1892 error = vn_refreshlabel(vp, cred);
1893 if (error)
1894 return (error);
1895
1896 MAC_CHECK(check_vnode_readlink, cred, vp, &vp->v_label);
1897 return (error);
1898}
1899
1900static int
1901mac_check_vnode_relabel(struct ucred *cred, struct vnode *vp,
1902 struct label *newlabel)
1903{
1904 int error;
1905
1906 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_relabel");
1907
1908 error = vn_refreshlabel(vp, cred);
1909 if (error)
1910 return (error);
1911
1912 MAC_CHECK(check_vnode_relabel, cred, vp, &vp->v_label, newlabel);
1913
1914 return (error);
1915}
1916
1917int
1918mac_check_vnode_rename_from(struct ucred *cred, struct vnode *dvp,
1919 struct vnode *vp, struct componentname *cnp)
1920{
1921 int error;
1922
1923 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_rename_from");
1924 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_rename_from");
1925
1926 if (!mac_enforce_fs)
1927 return (0);
1928
1929 error = vn_refreshlabel(dvp, cred);
1930 if (error)
1931 return (error);
1932 error = vn_refreshlabel(vp, cred);
1933 if (error)
1934 return (error);
1935
1936 MAC_CHECK(check_vnode_rename_from, cred, dvp, &dvp->v_label, vp,
1937 &vp->v_label, cnp);
1938 return (error);
1939}
1940
1941int
1942mac_check_vnode_rename_to(struct ucred *cred, struct vnode *dvp,
1943 struct vnode *vp, int samedir, struct componentname *cnp)
1944{
1945 int error;
1946
1947 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_rename_to");
1948 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_rename_to");
1949
1950 if (!mac_enforce_fs)
1951 return (0);
1952
1953 error = vn_refreshlabel(dvp, cred);
1954 if (error)
1955 return (error);
1956 if (vp != NULL) {
1957 error = vn_refreshlabel(vp, cred);
1958 if (error)
1959 return (error);
1960 }
1961 MAC_CHECK(check_vnode_rename_to, cred, dvp, &dvp->v_label, vp,
1962 vp != NULL ? &vp->v_label : NULL, samedir, cnp);
1963 return (error);
1964}
1965
1966int
1967mac_check_vnode_revoke(struct ucred *cred, struct vnode *vp)
1968{
1969 int error;
1970
1971 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_revoke");
1972
1973 if (!mac_enforce_fs)
1974 return (0);
1975
1976 error = vn_refreshlabel(vp, cred);
1977 if (error)
1978 return (error);
1979
1980 MAC_CHECK(check_vnode_revoke, cred, vp, &vp->v_label);
1981 return (error);
1982}
1983
1984int
1985mac_check_vnode_setacl(struct ucred *cred, struct vnode *vp, acl_type_t type,
1986 struct acl *acl)
1987{
1988 int error;
1989
1990 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setacl");
1991
1992 if (!mac_enforce_fs)
1993 return (0);
1994
1995 error = vn_refreshlabel(vp, cred);
1996 if (error)
1997 return (error);
1998
1999 MAC_CHECK(check_vnode_setacl, cred, vp, &vp->v_label, type, acl);
2000 return (error);
2001}
2002
2003int
2004mac_check_vnode_setextattr(struct ucred *cred, struct vnode *vp,
2005 int attrnamespace, const char *name, struct uio *uio)
2006{
2007 int error;
2008
2009 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setextattr");
2010
2011 if (!mac_enforce_fs)
2012 return (0);
2013
2014 error = vn_refreshlabel(vp, cred);
2015 if (error)
2016 return (error);
2017
2018 MAC_CHECK(check_vnode_setextattr, cred, vp, &vp->v_label,
2019 attrnamespace, name, uio);
2020 return (error);
2021}
2022
2023int
2024mac_check_vnode_setflags(struct ucred *cred, struct vnode *vp, u_long flags)
2025{
2026 int error;
2027
2028 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setflags");
2029
2030 if (!mac_enforce_fs)
2031 return (0);
2032
2033 error = vn_refreshlabel(vp, cred);
2034 if (error)
2035 return (error);
2036
2037 MAC_CHECK(check_vnode_setflags, cred, vp, &vp->v_label, flags);
2038 return (error);
2039}
2040
2041int
2042mac_check_vnode_setmode(struct ucred *cred, struct vnode *vp, mode_t mode)
2043{
2044 int error;
2045
2046 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setmode");
2047
2048 if (!mac_enforce_fs)
2049 return (0);
2050
2051 error = vn_refreshlabel(vp, cred);
2052 if (error)
2053 return (error);
2054
2055 MAC_CHECK(check_vnode_setmode, cred, vp, &vp->v_label, mode);
2056 return (error);
2057}
2058
2059int
2060mac_check_vnode_setowner(struct ucred *cred, struct vnode *vp, uid_t uid,
2061 gid_t gid)
2062{
2063 int error;
2064
2065 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setowner");
2066
2067 if (!mac_enforce_fs)
2068 return (0);
2069
2070 error = vn_refreshlabel(vp, cred);
2071 if (error)
2072 return (error);
2073
2074 MAC_CHECK(check_vnode_setowner, cred, vp, &vp->v_label, uid, gid);
2075 return (error);
2076}
2077
2078int
2079mac_check_vnode_setutimes(struct ucred *cred, struct vnode *vp,
2080 struct timespec atime, struct timespec mtime)
2081{
2082 int error;
2083
2084 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setutimes");
2085
2086 if (!mac_enforce_fs)
2087 return (0);
2088
2089 error = vn_refreshlabel(vp, cred);
2090 if (error)
2091 return (error);
2092
2093 MAC_CHECK(check_vnode_setutimes, cred, vp, &vp->v_label, atime,
2094 mtime);
2095 return (error);
2096}
2097
2098int
2099mac_check_vnode_stat(struct ucred *active_cred, struct ucred *file_cred,
2100 struct vnode *vp)
2101{
2102 int error;
2103
2104 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_stat");
2105
2106 if (!mac_enforce_fs)
2107 return (0);
2108
2109 error = vn_refreshlabel(vp, active_cred);
2110 if (error)
2111 return (error);
2112
2113 MAC_CHECK(check_vnode_stat, active_cred, file_cred, vp,
2114 &vp->v_label);
2115 return (error);
2116}
2117
2118int
2119mac_check_vnode_write(struct ucred *active_cred, struct ucred *file_cred,
2120 struct vnode *vp)
2121{
2122 int error;
2123
2124 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_write");
2125
2126 if (!mac_enforce_fs)
2127 return (0);
2128
2129 error = vn_refreshlabel(vp, active_cred);
2130 if (error)
2131 return (error);
2132
2133 MAC_CHECK(check_vnode_write, active_cred, file_cred, vp,
2134 &vp->v_label);
2135
2136 return (error);
2137}
2138
2139/*
2140 * When relabeling a process, call out to the policies for the maximum
2141 * permission allowed for each object type we know about in its
2142 * memory space, and revoke access (in the least surprising ways we
2143 * know) when necessary. The process lock is not held here.
2144 */
2145static void
2146mac_cred_mmapped_drop_perms(struct thread *td, struct ucred *cred)
2147{
2148
2149 /* XXX freeze all other threads */
2150 mac_cred_mmapped_drop_perms_recurse(td, cred,
2151 &td->td_proc->p_vmspace->vm_map);
2152 /* XXX allow other threads to continue */
2153}
2154
2155static __inline const char *
2156prot2str(vm_prot_t prot)
2157{
2158
2159 switch (prot & VM_PROT_ALL) {
2160 case VM_PROT_READ:
2161 return ("r--");
2162 case VM_PROT_READ | VM_PROT_WRITE:
2163 return ("rw-");
2164 case VM_PROT_READ | VM_PROT_EXECUTE:
2165 return ("r-x");
2166 case VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE:
2167 return ("rwx");
2168 case VM_PROT_WRITE:
2169 return ("-w-");
2170 case VM_PROT_EXECUTE:
2171 return ("--x");
2172 case VM_PROT_WRITE | VM_PROT_EXECUTE:
2173 return ("-wx");
2174 default:
2175 return ("---");
2176 }
2177}
2178
2179static void
2180mac_cred_mmapped_drop_perms_recurse(struct thread *td, struct ucred *cred,
2181 struct vm_map *map)
2182{
2183 struct vm_map_entry *vme;
2184 vm_prot_t result, revokeperms;
2185 vm_object_t object;
2186 vm_ooffset_t offset;
2187 struct vnode *vp;
2188
2189 if (!mac_mmap_revocation)
2190 return;
2191
2192 vm_map_lock_read(map);
2193 for (vme = map->header.next; vme != &map->header; vme = vme->next) {
2194 if (vme->eflags & MAP_ENTRY_IS_SUB_MAP) {
2195 mac_cred_mmapped_drop_perms_recurse(td, cred,
2196 vme->object.sub_map);
2197 continue;
2198 }
2199 /*
2200 * Skip over entries that obviously are not shared.
2201 */
2202 if (vme->eflags & (MAP_ENTRY_COW | MAP_ENTRY_NOSYNC) ||
2203 !vme->max_protection)
2204 continue;
2205 /*
2206 * Drill down to the deepest backing object.
2207 */
2208 offset = vme->offset;
2209 object = vme->object.vm_object;
2210 if (object == NULL)
2211 continue;
2212 while (object->backing_object != NULL) {
2213 object = object->backing_object;
2214 offset += object->backing_object_offset;
2215 }
2216 /*
2217 * At the moment, vm_maps and objects aren't considered
2218 * by the MAC system, so only things with backing by a
2219 * normal object (read: vnodes) are checked.
2220 */
2221 if (object->type != OBJT_VNODE)
2222 continue;
2223 vp = (struct vnode *)object->handle;
2224 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
2225 result = mac_check_vnode_mmap_prot(cred, vp, 0);
2226 VOP_UNLOCK(vp, 0, td);
2227 /*
2228 * Find out what maximum protection we may be allowing
2229 * now but a policy needs to get removed.
2230 */
2231 revokeperms = vme->max_protection & ~result;
2232 if (!revokeperms)
2233 continue;
2234 printf("pid %ld: revoking %s perms from %#lx:%ld "
2235 "(max %s/cur %s)\n", (long)td->td_proc->p_pid,
2236 prot2str(revokeperms), (u_long)vme->start,
2237 (long)(vme->end - vme->start),
2238 prot2str(vme->max_protection), prot2str(vme->protection));
2239 vm_map_lock_upgrade(map);
2240 /*
2241 * This is the really simple case: if a map has more
2242 * max_protection than is allowed, but it's not being
2243 * actually used (that is, the current protection is
2244 * still allowed), we can just wipe it out and do
2245 * nothing more.
2246 */
2247 if ((vme->protection & revokeperms) == 0) {
2248 vme->max_protection -= revokeperms;
2249 } else {
2250 if (revokeperms & VM_PROT_WRITE) {
2251 /*
2252 * In the more complicated case, flush out all
2253 * pending changes to the object then turn it
2254 * copy-on-write.
2255 */
2256 vm_object_reference(object);
2257 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
2258 vm_object_page_clean(object,
2259 OFF_TO_IDX(offset),
2260 OFF_TO_IDX(offset + vme->end - vme->start +
2261 PAGE_MASK),
2262 OBJPC_SYNC);
2263 VOP_UNLOCK(vp, 0, td);
2264 vm_object_deallocate(object);
2265 /*
2266 * Why bother if there's no read permissions
2267 * anymore? For the rest, we need to leave
2268 * the write permissions on for COW, or
2269 * remove them entirely if configured to.
2270 */
2271 if (!mac_mmap_revocation_via_cow) {
2272 vme->max_protection &= ~VM_PROT_WRITE;
2273 vme->protection &= ~VM_PROT_WRITE;
2274 } if ((revokeperms & VM_PROT_READ) == 0)
2275 vme->eflags |= MAP_ENTRY_COW |
2276 MAP_ENTRY_NEEDS_COPY;
2277 }
2278 if (revokeperms & VM_PROT_EXECUTE) {
2279 vme->max_protection &= ~VM_PROT_EXECUTE;
2280 vme->protection &= ~VM_PROT_EXECUTE;
2281 }
2282 if (revokeperms & VM_PROT_READ) {
2283 vme->max_protection = 0;
2284 vme->protection = 0;
2285 }
2286 pmap_protect(map->pmap, vme->start, vme->end,
2287 vme->protection & ~revokeperms);
2288 vm_map_simplify_entry(map, vme);
2289 }
2290 vm_map_lock_downgrade(map);
2291 }
2292 vm_map_unlock_read(map);
2293}
2294
2295/*
2296 * When the subject's label changes, it may require revocation of privilege
2297 * to mapped objects. This can't be done on-the-fly later with a unified
2298 * buffer cache.
2299 */
2300static void
2301mac_relabel_cred(struct ucred *cred, struct label *newlabel)
2302{
2303
2304 MAC_PERFORM(relabel_cred, cred, newlabel);
2305}
2306
2307void
2308mac_relabel_vnode(struct ucred *cred, struct vnode *vp, struct label *newlabel)
2309{
2310
2311 MAC_PERFORM(relabel_vnode, cred, vp, &vp->v_label, newlabel);
2312}
2313
2314void
2315mac_create_ifnet(struct ifnet *ifnet)
2316{
2317
2318 MAC_PERFORM(create_ifnet, ifnet, &ifnet->if_label);
2319}
2320
2321void
2322mac_create_bpfdesc(struct ucred *cred, struct bpf_d *bpf_d)
2323{
2324
2325 MAC_PERFORM(create_bpfdesc, cred, bpf_d, &bpf_d->bd_label);
2326}
2327
2328void
2329mac_create_socket(struct ucred *cred, struct socket *socket)
2330{
2331
2332 MAC_PERFORM(create_socket, cred, socket, &socket->so_label);
2333}
2334
2335void
2336mac_create_pipe(struct ucred *cred, struct pipe *pipe)
2337{
2338
2339 MAC_PERFORM(create_pipe, cred, pipe, pipe->pipe_label);
2340}
2341
2342void
2343mac_create_socket_from_socket(struct socket *oldsocket,
2344 struct socket *newsocket)
2345{
2346
2347 MAC_PERFORM(create_socket_from_socket, oldsocket, &oldsocket->so_label,
2348 newsocket, &newsocket->so_label);
2349}
2350
2351static void
2352mac_relabel_socket(struct ucred *cred, struct socket *socket,
2353 struct label *newlabel)
2354{
2355
2356 MAC_PERFORM(relabel_socket, cred, socket, &socket->so_label, newlabel);
2357}
2358
2359static void
2360mac_relabel_pipe(struct ucred *cred, struct pipe *pipe, struct label *newlabel)
2361{
2362
2363 MAC_PERFORM(relabel_pipe, cred, pipe, pipe->pipe_label, newlabel);
2364}
2365
2366void
2367mac_set_socket_peer_from_mbuf(struct mbuf *mbuf, struct socket *socket)
2368{
2369
2370 MAC_PERFORM(set_socket_peer_from_mbuf, mbuf, &mbuf->m_pkthdr.label,
2371 socket, &socket->so_peerlabel);
2372}
2373
2374void
2375mac_set_socket_peer_from_socket(struct socket *oldsocket,
2376 struct socket *newsocket)
2377{
2378
2379 MAC_PERFORM(set_socket_peer_from_socket, oldsocket,
2380 &oldsocket->so_label, newsocket, &newsocket->so_peerlabel);
2381}
2382
2383void
2384mac_create_datagram_from_ipq(struct ipq *ipq, struct mbuf *datagram)
2385{
2386
2387 MAC_PERFORM(create_datagram_from_ipq, ipq, &ipq->ipq_label,
2388 datagram, &datagram->m_pkthdr.label);
2389}
2390
2391void
2392mac_create_fragment(struct mbuf *datagram, struct mbuf *fragment)
2393{
2394
2395 MAC_PERFORM(create_fragment, datagram, &datagram->m_pkthdr.label,
2396 fragment, &fragment->m_pkthdr.label);
2397}
2398
2399void
2400mac_create_ipq(struct mbuf *fragment, struct ipq *ipq)
2401{
2402
2403 MAC_PERFORM(create_ipq, fragment, &fragment->m_pkthdr.label, ipq,
2404 &ipq->ipq_label);
2405}
2406
2407void
2408mac_create_mbuf_from_mbuf(struct mbuf *oldmbuf, struct mbuf *newmbuf)
2409{
2410
2411 MAC_PERFORM(create_mbuf_from_mbuf, oldmbuf, &oldmbuf->m_pkthdr.label,
2412 newmbuf, &newmbuf->m_pkthdr.label);
2413}
2414
2415void
2416mac_create_mbuf_from_bpfdesc(struct bpf_d *bpf_d, struct mbuf *mbuf)
2417{
2418
2419 MAC_PERFORM(create_mbuf_from_bpfdesc, bpf_d, &bpf_d->bd_label, mbuf,
2420 &mbuf->m_pkthdr.label);
2421}
2422
2423void
2424mac_create_mbuf_linklayer(struct ifnet *ifnet, struct mbuf *mbuf)
2425{
2426
2427 MAC_PERFORM(create_mbuf_linklayer, ifnet, &ifnet->if_label, mbuf,
2428 &mbuf->m_pkthdr.label);
2429}
2430
2431void
2432mac_create_mbuf_from_ifnet(struct ifnet *ifnet, struct mbuf *mbuf)
2433{
2434
2435 MAC_PERFORM(create_mbuf_from_ifnet, ifnet, &ifnet->if_label, mbuf,
2436 &mbuf->m_pkthdr.label);
2437}
2438
2439void
2440mac_create_mbuf_multicast_encap(struct mbuf *oldmbuf, struct ifnet *ifnet,
2441 struct mbuf *newmbuf)
2442{
2443
2444 MAC_PERFORM(create_mbuf_multicast_encap, oldmbuf,
2445 &oldmbuf->m_pkthdr.label, ifnet, &ifnet->if_label, newmbuf,
2446 &newmbuf->m_pkthdr.label);
2447}
2448
2449void
2450mac_create_mbuf_netlayer(struct mbuf *oldmbuf, struct mbuf *newmbuf)
2451{
2452
2453 MAC_PERFORM(create_mbuf_netlayer, oldmbuf, &oldmbuf->m_pkthdr.label,
2454 newmbuf, &newmbuf->m_pkthdr.label);
2455}
2456
2457int
2458mac_fragment_match(struct mbuf *fragment, struct ipq *ipq)
2459{
2460 int result;
2461
2462 result = 1;
2463 MAC_BOOLEAN(fragment_match, &&, fragment, &fragment->m_pkthdr.label,
2464 ipq, &ipq->ipq_label);
2465
2466 return (result);
2467}
2468
2469void
2470mac_update_ipq(struct mbuf *fragment, struct ipq *ipq)
2471{
2472
2473 MAC_PERFORM(update_ipq, fragment, &fragment->m_pkthdr.label, ipq,
2474 &ipq->ipq_label);
2475}
2476
2477void
2478mac_create_mbuf_from_socket(struct socket *socket, struct mbuf *mbuf)
2479{
2480
2481 MAC_PERFORM(create_mbuf_from_socket, socket, &socket->so_label, mbuf,
2482 &mbuf->m_pkthdr.label);
2483}
2484
2485void
2486mac_create_mount(struct ucred *cred, struct mount *mp)
2487{
2488
2489 MAC_PERFORM(create_mount, cred, mp, &mp->mnt_mntlabel,
2490 &mp->mnt_fslabel);
2491}
2492
2493void
2494mac_create_root_mount(struct ucred *cred, struct mount *mp)
2495{
2496
2497 MAC_PERFORM(create_root_mount, cred, mp, &mp->mnt_mntlabel,
2498 &mp->mnt_fslabel);
2499}
2500
2501int
2502mac_check_bpfdesc_receive(struct bpf_d *bpf_d, struct ifnet *ifnet)
2503{
2504 int error;
2505
2506 if (!mac_enforce_network)
2507 return (0);
2508
2509 MAC_CHECK(check_bpfdesc_receive, bpf_d, &bpf_d->bd_label, ifnet,
2510 &ifnet->if_label);
2511
2512 return (error);
2513}
2514
2515static int
2516mac_check_cred_relabel(struct ucred *cred, struct label *newlabel)
2517{
2518 int error;
2519
2520 MAC_CHECK(check_cred_relabel, cred, newlabel);
2521
2522 return (error);
2523}
2524
2525int
2526mac_check_cred_visible(struct ucred *u1, struct ucred *u2)
2527{
2528 int error;
2529
2530 if (!mac_enforce_process)
2531 return (0);
2532
2533 MAC_CHECK(check_cred_visible, u1, u2);
2534
2535 return (error);
2536}
2537
2538int
2539mac_check_ifnet_transmit(struct ifnet *ifnet, struct mbuf *mbuf)
2540{
2541 int error;
2542
2543 if (!mac_enforce_network)
2544 return (0);
2545
2546 KASSERT(mbuf->m_flags & M_PKTHDR, ("packet has no pkthdr"));
2547 if (!(mbuf->m_pkthdr.label.l_flags & MAC_FLAG_INITIALIZED))
2548 printf("%s%d: not initialized\n", ifnet->if_name,
2549 ifnet->if_unit);
2550
2551 MAC_CHECK(check_ifnet_transmit, ifnet, &ifnet->if_label, mbuf,
2552 &mbuf->m_pkthdr.label);
2553
2554 return (error);
2555}
2556
2557int
2558mac_check_mount_stat(struct ucred *cred, struct mount *mount)
2559{
2560 int error;
2561
2562 if (!mac_enforce_fs)
2563 return (0);
2564
2565 MAC_CHECK(check_mount_stat, cred, mount, &mount->mnt_mntlabel);
2566
2567 return (error);
2568}
2569
2570int
2571mac_check_pipe_ioctl(struct ucred *cred, struct pipe *pipe, unsigned long cmd,
2572 void *data)
2573{
2574 int error;
2575
2576 PIPE_LOCK_ASSERT(pipe, MA_OWNED);
2577
2578 if (!mac_enforce_pipe)
2579 return (0);
2580
2581 MAC_CHECK(check_pipe_ioctl, cred, pipe, pipe->pipe_label, cmd, data);
2582
2583 return (error);
2584}
2585
2586int
2587mac_check_pipe_poll(struct ucred *cred, struct pipe *pipe)
2588{
2589 int error;
2590
2591 PIPE_LOCK_ASSERT(pipe, MA_OWNED);
2592
2593 if (!mac_enforce_pipe)
2594 return (0);
2595
2596 MAC_CHECK(check_pipe_poll, cred, pipe, pipe->pipe_label);
2597
2598 return (error);
2599}
2600
2601int
2602mac_check_pipe_read(struct ucred *cred, struct pipe *pipe)
2603{
2604 int error;
2605
2606 PIPE_LOCK_ASSERT(pipe, MA_OWNED);
2607
2608 if (!mac_enforce_pipe)
2609 return (0);
2610
2611 MAC_CHECK(check_pipe_read, cred, pipe, pipe->pipe_label);
2612
2613 return (error);
2614}
2615
2616static int
2617mac_check_pipe_relabel(struct ucred *cred, struct pipe *pipe,
2618 struct label *newlabel)
2619{
2620 int error;
2621
2622 PIPE_LOCK_ASSERT(pipe, MA_OWNED);
2623
2624 if (!mac_enforce_pipe)
2625 return (0);
2626
2627 MAC_CHECK(check_pipe_relabel, cred, pipe, pipe->pipe_label, newlabel);
2628
2629 return (error);
2630}
2631
2632int
2633mac_check_pipe_stat(struct ucred *cred, struct pipe *pipe)
2634{
2635 int error;
2636
2637 PIPE_LOCK_ASSERT(pipe, MA_OWNED);
2638
2639 if (!mac_enforce_pipe)
2640 return (0);
2641
2642 MAC_CHECK(check_pipe_stat, cred, pipe, pipe->pipe_label);
2643
2644 return (error);
2645}
2646
2647int
2648mac_check_pipe_write(struct ucred *cred, struct pipe *pipe)
2649{
2650 int error;
2651
2652 PIPE_LOCK_ASSERT(pipe, MA_OWNED);
2653
2654 if (!mac_enforce_pipe)
2655 return (0);
2656
2657 MAC_CHECK(check_pipe_write, cred, pipe, pipe->pipe_label);
2658
2659 return (error);
2660}
2661
2662int
2663mac_check_proc_debug(struct ucred *cred, struct proc *proc)
2664{
2665 int error;
2666
2667 PROC_LOCK_ASSERT(proc, MA_OWNED);
2668
2669 if (!mac_enforce_process)
2670 return (0);
2671
2672 MAC_CHECK(check_proc_debug, cred, proc);
2673
2674 return (error);
2675}
2676
2677int
2678mac_check_proc_sched(struct ucred *cred, struct proc *proc)
2679{
2680 int error;
2681
2682 PROC_LOCK_ASSERT(proc, MA_OWNED);
2683
2684 if (!mac_enforce_process)
2685 return (0);
2686
2687 MAC_CHECK(check_proc_sched, cred, proc);
2688
2689 return (error);
2690}
2691
2692int
2693mac_check_proc_signal(struct ucred *cred, struct proc *proc, int signum)
2694{
2695 int error;
2696
2697 PROC_LOCK_ASSERT(proc, MA_OWNED);
2698
2699 if (!mac_enforce_process)
2700 return (0);
2701
2702 MAC_CHECK(check_proc_signal, cred, proc, signum);
2703
2704 return (error);
2705}
2706
2707int
2708mac_check_socket_bind(struct ucred *ucred, struct socket *socket,
2709 struct sockaddr *sockaddr)
2710{
2711 int error;
2712
2713 if (!mac_enforce_socket)
2714 return (0);
2715
2716 MAC_CHECK(check_socket_bind, ucred, socket, &socket->so_label,
2717 sockaddr);
2718
2719 return (error);
2720}
2721
2722int
2723mac_check_socket_connect(struct ucred *cred, struct socket *socket,
2724 struct sockaddr *sockaddr)
2725{
2726 int error;
2727
2728 if (!mac_enforce_socket)
2729 return (0);
2730
2731 MAC_CHECK(check_socket_connect, cred, socket, &socket->so_label,
2732 sockaddr);
2733
2734 return (error);
2735}
2736
2737int
2738mac_check_socket_deliver(struct socket *socket, struct mbuf *mbuf)
2739{
2740 int error;
2741
2742 if (!mac_enforce_socket)
2743 return (0);
2744
2745 MAC_CHECK(check_socket_deliver, socket, &socket->so_label, mbuf,
2746 &mbuf->m_pkthdr.label);
2747
2748 return (error);
2749}
2750
2751int
2752mac_check_socket_listen(struct ucred *cred, struct socket *socket)
2753{
2754 int error;
2755
2756 if (!mac_enforce_socket)
2757 return (0);
2758
2759 MAC_CHECK(check_socket_listen, cred, socket, &socket->so_label);
2760 return (error);
2761}
2762
2763static int
2764mac_check_socket_relabel(struct ucred *cred, struct socket *socket,
2765 struct label *newlabel)
2766{
2767 int error;
2768
2769 MAC_CHECK(check_socket_relabel, cred, socket, &socket->so_label,
2770 newlabel);
2771
2772 return (error);
2773}
2774
2775int
2776mac_check_socket_visible(struct ucred *cred, struct socket *socket)
2777{
2778 int error;
2779
2780 if (!mac_enforce_socket)
2781 return (0);
2782
2783 MAC_CHECK(check_socket_visible, cred, socket, &socket->so_label);
2784
2785 return (error);
2786}
2787
2788int
2789mac_ioctl_ifnet_get(struct ucred *cred, struct ifreq *ifr,
2790 struct ifnet *ifnet)
2791{
2792 struct mac label;
2793 int error;
2794
2795 error = mac_externalize(&ifnet->if_label, &label);
2796 if (error)
2797 return (error);
2798
2799 return (copyout(&label, ifr->ifr_ifru.ifru_data, sizeof(label)));
2800}
2801
2802int
2803mac_ioctl_ifnet_set(struct ucred *cred, struct ifreq *ifr,
2804 struct ifnet *ifnet)
2805{
2806 struct mac newlabel;
2807 struct label intlabel;
2808 int error;
2809
2810 error = copyin(ifr->ifr_ifru.ifru_data, &newlabel, sizeof(newlabel));
2811 if (error)
2812 return (error);
2813
2814 error = mac_internalize(&intlabel, &newlabel);
2815 if (error)
2816 return (error);
2817
2818 /*
2819 * XXX: Note that this is a redundant privilege check, since
2820 * policies impose this check themselves if required by the
2821 * policy. Eventually, this should go away.
2822 */
2823 error = suser_cred(cred, 0);
2824 if (error)
2825 goto out;
2826
2827 MAC_CHECK(check_ifnet_relabel, cred, ifnet, &ifnet->if_label,
2828 &intlabel);
2829 if (error)
2830 goto out;
2831
2832 MAC_PERFORM(relabel_ifnet, cred, ifnet, &ifnet->if_label, &intlabel);
2833
2834out:
2835 mac_destroy_temp(&intlabel);
2836 return (error);
2837}
2838
2839void
2840mac_create_devfs_vnode(struct devfs_dirent *de, struct vnode *vp)
2841{
2842
2843 MAC_PERFORM(create_devfs_vnode, de, &de->de_label, vp, &vp->v_label);
2844}
2845
2846void
2847mac_create_devfs_device(dev_t dev, struct devfs_dirent *de)
2848{
2849
2850 MAC_PERFORM(create_devfs_device, dev, de, &de->de_label);
2851}
2852
2853static int
2854mac_stdcreatevnode_ea(struct vnode *vp)
2855{
2856 int error;
2857
2858 MAC_CHECK(stdcreatevnode_ea, vp, &vp->v_label);
2859
2860 return (error);
2861}
2862
2863void
2864mac_create_devfs_directory(char *dirname, int dirnamelen,
2865 struct devfs_dirent *de)
2866{
2867
2868 MAC_PERFORM(create_devfs_directory, dirname, dirnamelen, de,
2869 &de->de_label);
2870}
2871
2872/*
2873 * When a new vnode is created, this call will initialize its label.
2874 */
2875void
2876mac_create_vnode(struct ucred *cred, struct vnode *parent,
2877 struct vnode *child)
2878{
2879 int error;
2880
2881 ASSERT_VOP_LOCKED(parent, "mac_create_vnode");
2882 ASSERT_VOP_LOCKED(child, "mac_create_vnode");
2883
2884 error = vn_refreshlabel(parent, cred);
2885 if (error) {
2886 printf("mac_create_vnode: vn_refreshlabel returned %d\n",
2887 error);
2888 printf("mac_create_vnode: using old vnode label\n");
2889 }
2890
2891 MAC_PERFORM(create_vnode, cred, parent, &parent->v_label, child,
2892 &child->v_label);
2893}
2894
2895int
2896mac_setsockopt_label_set(struct ucred *cred, struct socket *so,
2897 struct mac *extmac)
2898{
2899 struct label intlabel;
2900 int error;
2901
2902 error = mac_internalize(&intlabel, extmac);
2903 if (error)
2904 return (error);
2905
2906 mac_check_socket_relabel(cred, so, &intlabel);
2907 if (error) {
2908 mac_destroy_temp(&intlabel);
2909 return (error);
2910 }
2911
2912 mac_relabel_socket(cred, so, &intlabel);
2913
2914 mac_destroy_temp(&intlabel);
2915 return (0);
2916}
2917
2918int
2919mac_pipe_label_set(struct ucred *cred, struct pipe *pipe, struct label *label)
2920{
2921 int error;
2922
2923 PIPE_LOCK_ASSERT(pipe, MA_OWNED);
2924
2925 error = mac_check_pipe_relabel(cred, pipe, label);
2926 if (error)
2927 return (error);
2928
2929 mac_relabel_pipe(cred, pipe, label);
2930
2931 return (0);
2932}
2933
2934int
2935mac_getsockopt_label_get(struct ucred *cred, struct socket *so,
2936 struct mac *extmac)
2937{
2938
2939 return (mac_externalize(&so->so_label, extmac));
2940}
2941
2942int
2943mac_getsockopt_peerlabel_get(struct ucred *cred, struct socket *so,
2944 struct mac *extmac)
2945{
2946
2947 return (mac_externalize(&so->so_peerlabel, extmac));
2948}
2949
2950/*
2951 * Implementation of VOP_SETLABEL() that relies on extended attributes
2952 * to store label data. Can be referenced by filesystems supporting
2953 * extended attributes.
2954 */
2955int
2956vop_stdsetlabel_ea(struct vop_setlabel_args *ap)
2957{
2958 struct vnode *vp = ap->a_vp;
2959 struct label *intlabel = ap->a_label;
2960 struct mac extmac;
2961 int error;
2962
2963 ASSERT_VOP_LOCKED(vp, "vop_stdsetlabel_ea");
2964
2965 /*
2966 * XXX: Eventually call out to EA check/set calls here.
2967 * Be particularly careful to avoid race conditions,
2968 * consistency problems, and stability problems when
2969 * dealing with multiple EAs. In particular, we require
2970 * the ability to write multiple EAs on the same file in
2971 * a single transaction, which the current EA interface
2972 * does not provide.
2973 */
2974
2975 error = mac_externalize(intlabel, &extmac);
2976 if (error)
2977 return (error);
2978
2979 error = vn_extattr_set(vp, IO_NODELOCKED,
2980 FREEBSD_MAC_EXTATTR_NAMESPACE, FREEBSD_MAC_EXTATTR_NAME,
2981 sizeof(extmac), (char *)&extmac, curthread);
2982 if (error)
2983 return (error);
2984
2985 mac_relabel_vnode(ap->a_cred, vp, intlabel);
2986
2987 vp->v_vflag |= VV_CACHEDLABEL;
2988
2989 return (0);
2990}
2991
2992static int
2993vn_setlabel(struct vnode *vp, struct label *intlabel, struct ucred *cred)
2994{
2995 int error;
2996
2997 if (vp->v_mount == NULL) {
2998 /* printf("vn_setlabel: null v_mount\n"); */
2999 if (vp->v_type != VNON)
3000 printf("vn_setlabel: null v_mount with non-VNON\n");
3001 return (EBADF);
3002 }
3003
3004 if ((vp->v_mount->mnt_flag & MNT_MULTILABEL) == 0)
3005 return (EOPNOTSUPP);
3006
3007 /*
3008 * Multi-phase commit. First check the policies to confirm the
3009 * change is OK. Then commit via the filesystem. Finally,
3010 * update the actual vnode label. Question: maybe the filesystem
3011 * should update the vnode at the end as part of VOP_SETLABEL()?
3012 */
3013 error = mac_check_vnode_relabel(cred, vp, intlabel);
3014 if (error)
3015 return (error);
3016
3017 /*
3018 * VADMIN provides the opportunity for the filesystem to make
3019 * decisions about who is and is not able to modify labels
3020 * and protections on files. This might not be right. We can't
3021 * assume VOP_SETLABEL() will do it, because we might implement
3022 * that as part of vop_stdsetlabel_ea().
3023 */
3024 error = VOP_ACCESS(vp, VADMIN, cred, curthread);
3025 if (error)
3026 return (error);
3027
3028 error = VOP_SETLABEL(vp, intlabel, cred, curthread);
3029 if (error)
3030 return (error);
3031
3032 return (0);
3033}
3034
3035/*
3036 * MPSAFE
3037 */
3038int
3039__mac_get_proc(struct thread *td, struct __mac_get_proc_args *uap)
3040{
3041 struct mac extmac;
3042 int error;
3043
3044 error = mac_externalize(&td->td_ucred->cr_label, &extmac);
3045 if (error == 0)
3046 error = copyout(&extmac, SCARG(uap, mac_p), sizeof(extmac));
3047
3048 return (error);
3049}
3050
3051/*
3052 * MPSAFE
3053 */
3054int
3055__mac_set_proc(struct thread *td, struct __mac_set_proc_args *uap)
3056{
3057 struct ucred *newcred, *oldcred;
3058 struct proc *p;
3059 struct mac extmac;
3060 struct label intlabel;
3061 int error;
3062
3063 error = copyin(SCARG(uap, mac_p), &extmac, sizeof(extmac));
3064 if (error)
3065 return (error);
3066
3067 error = mac_internalize(&intlabel, &extmac);
3068 if (error)
3069 return (error);
3070
3071 newcred = crget();
3072
3073 p = td->td_proc;
3074 PROC_LOCK(p);
3075 oldcred = p->p_ucred;
3076
3077 error = mac_check_cred_relabel(oldcred, &intlabel);
3078 if (error) {
3079 PROC_UNLOCK(p);
3080 mac_destroy_temp(&intlabel);
3081 crfree(newcred);
3082 return (error);
3083 }
3084
3085 setsugid(p);
3086 crcopy(newcred, oldcred);
3087 mac_relabel_cred(newcred, &intlabel);
3088 p->p_ucred = newcred;
3089
3090 /*
3091 * Grab additional reference for use while revoking mmaps, prior
3092 * to releasing the proc lock and sharing the cred.
3093 */
3094 crhold(newcred);
3095 PROC_UNLOCK(p);
3096
3097 mtx_lock(&Giant);
3098 mac_cred_mmapped_drop_perms(td, newcred);
3099 mtx_unlock(&Giant);
3100
3101 crfree(newcred); /* Free revocation reference. */
3102 crfree(oldcred);
3103 mac_destroy_temp(&intlabel);
3104 return (0);
3105}
3106
3107/*
3108 * MPSAFE
3109 */
3110int
3111__mac_get_fd(struct thread *td, struct __mac_get_fd_args *uap)
3112{
3113 struct file *fp;
3114 struct mac extmac;
3115 struct vnode *vp;
3116 struct pipe *pipe;
3117 int error;
3118
3119 mtx_lock(&Giant);
3120
3121 error = fget(td, SCARG(uap, fd), &fp);
3122 if (error)
3123 goto out;
3124
3125 switch (fp->f_type) {
3126 case DTYPE_FIFO:
3127 case DTYPE_VNODE:
3128 vp = (struct vnode *)fp->f_data;
3129
3130 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
3131 error = vn_refreshlabel(vp, td->td_ucred);
3132 if (error == 0)
3133 error = mac_externalize(&vp->v_label, &extmac);
3134 VOP_UNLOCK(vp, 0, td);
3135 break;
3136 case DTYPE_PIPE:
3137 pipe = (struct pipe *)fp->f_data;
3138 error = mac_externalize(pipe->pipe_label, &extmac);
3139 break;
3140 default:
3141 error = EINVAL;
3142 }
3143
3144 if (error == 0)
3145 error = copyout(&extmac, SCARG(uap, mac_p), sizeof(extmac));
3146
3147 fdrop(fp, td);
3148
3149out:
3150 mtx_unlock(&Giant);
3151 return (error);
3152}
3153
3154/*
3155 * MPSAFE
3156 */
3157int
3158__mac_get_file(struct thread *td, struct __mac_get_file_args *uap)
3159{
3160 struct nameidata nd;
3161 struct mac extmac;
3162 int error;
3163
3164 mtx_lock(&Giant);
3165 NDINIT(&nd, LOOKUP, LOCKLEAF | FOLLOW, UIO_USERSPACE,
3166 SCARG(uap, path_p), td);
3167 error = namei(&nd);
3168 if (error)
3169 goto out;
3170
3171 error = vn_refreshlabel(nd.ni_vp, td->td_ucred);
3172 if (error == 0)
3173 error = mac_externalize(&nd.ni_vp->v_label, &extmac);
3174 NDFREE(&nd, 0);
3175 if (error)
3176 goto out;
3177
3178 error = copyout(&extmac, SCARG(uap, mac_p), sizeof(extmac));
3179
3180out:
3181 mtx_unlock(&Giant);
3182 return (error);
3183}
3184
3185/*
3186 * MPSAFE
3187 */
3188int
3189__mac_set_fd(struct thread *td, struct __mac_set_fd_args *uap)
3190{
3191 struct file *fp;
3192 struct mac extmac;
3193 struct label intlabel;
3194 struct mount *mp;
3195 struct vnode *vp;
3196 struct pipe *pipe;
3197 int error;
3198
3199 mtx_lock(&Giant);
3200 error = fget(td, SCARG(uap, fd), &fp);
3201 if (error)
3202 goto out1;
3203
3204 error = copyin(SCARG(uap, mac_p), &extmac, sizeof(extmac));
3205 if (error)
3206 goto out2;
3207
3208 error = mac_internalize(&intlabel, &extmac);
3209 if (error)
3210 goto out2;
3211
3212 switch (fp->f_type) {
3213 case DTYPE_FIFO:
3214 case DTYPE_VNODE:
3215 vp = (struct vnode *)fp->f_data;
3216 error = vn_start_write(vp, &mp, V_WAIT | PCATCH);
3217 if (error != 0)
3218 break;
3219
3220 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
3221 error = vn_setlabel(vp, &intlabel, td->td_ucred);
3222 VOP_UNLOCK(vp, 0, td);
3223 vn_finished_write(mp);
3224 mac_destroy_temp(&intlabel);
3225 break;
3226 case DTYPE_PIPE:
3227 pipe = (struct pipe *)fp->f_data;
3228 PIPE_LOCK(pipe);
3229 error = mac_pipe_label_set(td->td_ucred, pipe, &intlabel);
3230 PIPE_UNLOCK(pipe);
3231 break;
3232 default:
3233 error = EINVAL;
3234 }
3235
3236out2:
3237 fdrop(fp, td);
3238out1:
3239 mtx_unlock(&Giant);
3240 return (error);
3241}
3242
3243/*
3244 * MPSAFE
3245 */
3246int
3247__mac_set_file(struct thread *td, struct __mac_set_file_args *uap)
3248{
3249 struct nameidata nd;
3250 struct mac extmac;
3251 struct label intlabel;
3252 struct mount *mp;
3253 int error;
3254
3255 mtx_lock(&Giant);
3256
3257 error = copyin(SCARG(uap, mac_p), &extmac, sizeof(extmac));
3258 if (error)
3259 goto out;
3260
3261 error = mac_internalize(&intlabel, &extmac);
3262 if (error)
3263 goto out;
3264
3265 NDINIT(&nd, LOOKUP, LOCKLEAF | FOLLOW, UIO_USERSPACE,
3266 SCARG(uap, path_p), td);
3267 error = namei(&nd);
3268 if (error)
3269 goto out2;
3270 error = vn_start_write(nd.ni_vp, &mp, V_WAIT | PCATCH);
3271 if (error)
3272 goto out2;
3273
3274 error = vn_setlabel(nd.ni_vp, &intlabel, td->td_ucred);
3275
3276 vn_finished_write(mp);
3277out2:
3278 mac_destroy_temp(&intlabel);
3279 NDFREE(&nd, 0);
3280out:
3281 mtx_unlock(&Giant);
3282 return (error);
3283}
3284
3285int
3286mac_syscall(struct thread *td, struct mac_syscall_args *uap)
3287{
3288 struct mac_policy_conf *mpc;
3289 char target[MAC_MAX_POLICY_NAME];
3290 int error;
3291
3292 error = copyinstr(SCARG(uap, policy), target, sizeof(target), NULL);
3293 if (error)
3294 return (error);
3295
3296 error = ENOSYS;
3297 MAC_POLICY_LIST_BUSY();
3298 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) {
3299 if (strcmp(mpc->mpc_name, target) == 0 &&
3300 mpc->mpc_ops->mpo_syscall != NULL) {
3301 error = mpc->mpc_ops->mpo_syscall(td,
3302 SCARG(uap, call), SCARG(uap, arg));
3303 goto out;
3304 }
3305 }
3306
3307out:
3308 MAC_POLICY_LIST_UNBUSY();
3309 return (error);
3310}
3311
3312SYSINIT(mac, SI_SUB_MAC, SI_ORDER_FIRST, mac_init, NULL);
3313SYSINIT(mac_late, SI_SUB_MAC_LATE, SI_ORDER_FIRST, mac_late_init, NULL);
3314
3315#else /* !MAC */
3316
3317int
3318__mac_get_proc(struct thread *td, struct __mac_get_proc_args *uap)
3319{
3320
3321 return (ENOSYS);
3322}
3323
3324int
3325__mac_set_proc(struct thread *td, struct __mac_set_proc_args *uap)
3326{
3327
3328 return (ENOSYS);
3329}
3330
3331int
3332__mac_get_fd(struct thread *td, struct __mac_get_fd_args *uap)
3333{
3334
3335 return (ENOSYS);
3336}
3337
3338int
3339__mac_get_file(struct thread *td, struct __mac_get_file_args *uap)
3340{
3341
3342 return (ENOSYS);
3343}
3344
3345int
3346__mac_set_fd(struct thread *td, struct __mac_set_fd_args *uap)
3347{
3348
3349 return (ENOSYS);
3350}
3351
3352int
3353__mac_set_file(struct thread *td, struct __mac_set_file_args *uap)
3354{
3355
3356 return (ENOSYS);
3357}
3358
3359int
3360mac_syscall(struct thread *td, struct mac_syscall_args *uap)
3361{
3362
3363 return (ENOSYS);
3364}
3365
3366#endif /* !MAC */
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