40 */
41/*
42 * Developed by the TrustedBSD Project.
43 *
44 * Framework for extensible kernel access control. Kernel and userland
45 * interface to the framework, policy registration and composition.
46 */
47
48#include "opt_mac.h"
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
| 40 */
41/*
42 * Developed by the TrustedBSD Project.
43 *
44 * Framework for extensible kernel access control. Kernel and userland
45 * interface to the framework, policy registration and composition.
46 */
47
48#include "opt_mac.h"
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
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