1 /*-
2 * Copyright (c) 1999-2002 Robert N. M. Watson
3 * Copyright (c) 2001 Ilmar S. Habibulin
4 * Copyright (c) 2001-2005 McAfee, Inc.
5 * Copyright (c) 2005 SPARTA, Inc.
6 * All rights reserved.
7 *
8 * This software was developed by Robert Watson and Ilmar Habibulin for the
9 * TrustedBSD Project.
10 *
11 * This software was developed for the FreeBSD Project in part by McAfee
12 * Research, the Security Research Division of McAfee, Inc. under
13 * DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA
14 * CHATS research program.
15 *
16 * This software was enhanced by SPARTA ISSO under SPAWAR contract
17 * N66001-04-C-6019 ("SEFOS").
18 *
19 * Redistribution and use in source and binary forms, with or without
20 * modification, are permitted provided that the following conditions
21 * are met:
22 * 1. Redistributions of source code must retain the above copyright
23 * notice, this list of conditions and the following disclaimer.
24 * 2. Redistributions in binary form must reproduce the above copyright
25 * notice, this list of conditions and the following disclaimer in the
26 * documentation and/or other materials provided with the distribution.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * SUCH DAMAGE.
39 */
40
41 #include <sys/cdefs.h>
42 __FBSDID("$FreeBSD: releng/6.2/sys/security/mac/mac_vfs.c 161925 2006-09-02 23:58:21Z csjp $");
43
44 #include "opt_mac.h"
45 #include "opt_devfs.h"
46
47 #include <sys/param.h>
48 #include <sys/condvar.h>
49 #include <sys/extattr.h>
50 #include <sys/imgact.h>
51 #include <sys/kernel.h>
52 #include <sys/lock.h>
53 #include <sys/malloc.h>
54 #include <sys/mutex.h>
55 #include <sys/mac.h>
56 #include <sys/proc.h>
57 #include <sys/sbuf.h>
58 #include <sys/systm.h>
59 #include <sys/vnode.h>
60 #include <sys/mount.h>
61 #include <sys/file.h>
62 #include <sys/namei.h>
63 #include <sys/sysctl.h>
64
65 #include <vm/vm.h>
66 #include <vm/pmap.h>
67 #include <vm/vm_map.h>
68 #include <vm/vm_object.h>
69
70 #include <sys/mac_policy.h>
71
72 #include <fs/devfs/devfs.h>
73
74 #include <security/mac/mac_internal.h>
75
76 /*
77 * Warn about EA transactions only the first time they happen.
78 * Weak coherency, no locking.
79 */
80 static int ea_warn_once = 0;
81
82 static int mac_enforce_fs = 1;
83 SYSCTL_INT(_security_mac, OID_AUTO, enforce_fs, CTLFLAG_RW,
84 &mac_enforce_fs, 0, "Enforce MAC policy on file system objects");
85 TUNABLE_INT("security.mac.enforce_fs", &mac_enforce_fs);
86
87 #ifdef MAC_DEBUG
88 static int mac_debug_label_fallback = 0;
89 SYSCTL_INT(_security_mac_debug, OID_AUTO, label_fallback, CTLFLAG_RW,
90 &mac_debug_label_fallback, 0, "Filesystems should fall back to fs label"
91 "when label is corrupted.");
92 TUNABLE_INT("security.mac.debug_label_fallback",
93 &mac_debug_label_fallback);
94
95 static unsigned int nmacmounts, nmacvnodes, nmacdevfsdirents;
96 SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, mounts, CTLFLAG_RD,
97 &nmacmounts, 0, "number of mounts in use");
98 SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, vnodes, CTLFLAG_RD,
99 &nmacvnodes, 0, "number of vnodes in use");
100 SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, devfsdirents, CTLFLAG_RD,
101 &nmacdevfsdirents, 0, "number of devfs dirents inuse");
102 #endif
103
104 static int mac_setlabel_vnode_extattr(struct ucred *cred,
105 struct vnode *vp, struct label *intlabel);
106
107 static struct label *
108 mac_devfsdirent_label_alloc(void)
109 {
110 struct label *label;
111
112 label = mac_labelzone_alloc(M_WAITOK);
113 MAC_PERFORM(init_devfsdirent_label, label);
114 MAC_DEBUG_COUNTER_INC(&nmacdevfsdirents);
115 return (label);
116 }
117
118 void
119 mac_init_devfsdirent(struct devfs_dirent *de)
120 {
121
122 de->de_label = mac_devfsdirent_label_alloc();
123 }
124
125 static struct label *
126 mac_mount_label_alloc(void)
127 {
128 struct label *label;
129
130 label = mac_labelzone_alloc(M_WAITOK);
131 MAC_PERFORM(init_mount_label, label);
132 MAC_DEBUG_COUNTER_INC(&nmacmounts);
133 return (label);
134 }
135
136 static struct label *
137 mac_mount_fs_label_alloc(void)
138 {
139 struct label *label;
140
141 label = mac_labelzone_alloc(M_WAITOK);
142 MAC_PERFORM(init_mount_fs_label, label);
143 MAC_DEBUG_COUNTER_INC(&nmacmounts);
144 return (label);
145 }
146
147 void
148 mac_init_mount(struct mount *mp)
149 {
150
151 mp->mnt_mntlabel = mac_mount_label_alloc();
152 mp->mnt_fslabel = mac_mount_fs_label_alloc();
153 }
154
155 struct label *
156 mac_vnode_label_alloc(void)
157 {
158 struct label *label;
159
160 label = mac_labelzone_alloc(M_WAITOK);
161 MAC_PERFORM(init_vnode_label, label);
162 MAC_DEBUG_COUNTER_INC(&nmacvnodes);
163 return (label);
164 }
165
166 void
167 mac_init_vnode(struct vnode *vp)
168 {
169
170 vp->v_label = mac_vnode_label_alloc();
171 }
172
173 static void
174 mac_devfsdirent_label_free(struct label *label)
175 {
176
177 MAC_PERFORM(destroy_devfsdirent_label, label);
178 mac_labelzone_free(label);
179 MAC_DEBUG_COUNTER_DEC(&nmacdevfsdirents);
180 }
181
182 void
183 mac_destroy_devfsdirent(struct devfs_dirent *de)
184 {
185
186 mac_devfsdirent_label_free(de->de_label);
187 de->de_label = NULL;
188 }
189
190 static void
191 mac_mount_label_free(struct label *label)
192 {
193
194 MAC_PERFORM(destroy_mount_label, label);
195 mac_labelzone_free(label);
196 MAC_DEBUG_COUNTER_DEC(&nmacmounts);
197 }
198
199 static void
200 mac_mount_fs_label_free(struct label *label)
201 {
202
203 MAC_PERFORM(destroy_mount_fs_label, label);
204 mac_labelzone_free(label);
205 MAC_DEBUG_COUNTER_DEC(&nmacmounts);
206 }
207
208 void
209 mac_destroy_mount(struct mount *mp)
210 {
211
212 mac_mount_fs_label_free(mp->mnt_fslabel);
213 mp->mnt_fslabel = NULL;
214 mac_mount_label_free(mp->mnt_mntlabel);
215 mp->mnt_mntlabel = NULL;
216 }
217
218 void
219 mac_vnode_label_free(struct label *label)
220 {
221
222 MAC_PERFORM(destroy_vnode_label, label);
223 mac_labelzone_free(label);
224 MAC_DEBUG_COUNTER_DEC(&nmacvnodes);
225 }
226
227 void
228 mac_destroy_vnode(struct vnode *vp)
229 {
230
231 mac_vnode_label_free(vp->v_label);
232 vp->v_label = NULL;
233 }
234
235 void
236 mac_copy_vnode_label(struct label *src, struct label *dest)
237 {
238
239 MAC_PERFORM(copy_vnode_label, src, dest);
240 }
241
242 int
243 mac_externalize_vnode_label(struct label *label, char *elements,
244 char *outbuf, size_t outbuflen)
245 {
246 int error;
247
248 MAC_EXTERNALIZE(vnode, label, elements, outbuf, outbuflen);
249
250 return (error);
251 }
252
253 int
254 mac_internalize_vnode_label(struct label *label, char *string)
255 {
256 int error;
257
258 MAC_INTERNALIZE(vnode, label, string);
259
260 return (error);
261 }
262
263 void
264 mac_update_devfsdirent(struct mount *mp, struct devfs_dirent *de,
265 struct vnode *vp)
266 {
267
268 MAC_PERFORM(update_devfsdirent, mp, de, de->de_label, vp,
269 vp->v_label);
270 }
271
272 void
273 mac_associate_vnode_devfs(struct mount *mp, struct devfs_dirent *de,
274 struct vnode *vp)
275 {
276
277 MAC_PERFORM(associate_vnode_devfs, mp, mp->mnt_fslabel, de,
278 de->de_label, vp, vp->v_label);
279 }
280
281 int
282 mac_associate_vnode_extattr(struct mount *mp, struct vnode *vp)
283 {
284 int error;
285
286 ASSERT_VOP_LOCKED(vp, "mac_associate_vnode_extattr");
287
288 MAC_CHECK(associate_vnode_extattr, mp, mp->mnt_fslabel, vp,
289 vp->v_label);
290
291 return (error);
292 }
293
294 void
295 mac_associate_vnode_singlelabel(struct mount *mp, struct vnode *vp)
296 {
297
298 MAC_PERFORM(associate_vnode_singlelabel, mp, mp->mnt_fslabel, vp,
299 vp->v_label);
300 }
301
302 int
303 mac_create_vnode_extattr(struct ucred *cred, struct mount *mp,
304 struct vnode *dvp, struct vnode *vp, struct componentname *cnp)
305 {
306 int error;
307
308 ASSERT_VOP_LOCKED(dvp, "mac_create_vnode_extattr");
309 ASSERT_VOP_LOCKED(vp, "mac_create_vnode_extattr");
310
311 error = VOP_OPENEXTATTR(vp, cred, curthread);
312 if (error == EOPNOTSUPP) {
313 /* XXX: Optionally abort if transactions not supported. */
314 if (ea_warn_once == 0) {
315 printf("Warning: transactions not supported "
316 "in EA write.\n");
317 ea_warn_once = 1;
318 }
319 } else if (error)
320 return (error);
321
322 MAC_CHECK(create_vnode_extattr, cred, mp, mp->mnt_fslabel,
323 dvp, dvp->v_label, vp, vp->v_label, cnp);
324
325 if (error) {
326 VOP_CLOSEEXTATTR(vp, 0, NOCRED, curthread);
327 return (error);
328 }
329
330 error = VOP_CLOSEEXTATTR(vp, 1, NOCRED, curthread);
331
332 if (error == EOPNOTSUPP)
333 error = 0; /* XXX */
334
335 return (error);
336 }
337
338 static int
339 mac_setlabel_vnode_extattr(struct ucred *cred, struct vnode *vp,
340 struct label *intlabel)
341 {
342 int error;
343
344 ASSERT_VOP_LOCKED(vp, "mac_setlabel_vnode_extattr");
345
346 error = VOP_OPENEXTATTR(vp, cred, curthread);
347 if (error == EOPNOTSUPP) {
348 /* XXX: Optionally abort if transactions not supported. */
349 if (ea_warn_once == 0) {
350 printf("Warning: transactions not supported "
351 "in EA write.\n");
352 ea_warn_once = 1;
353 }
354 } else if (error)
355 return (error);
356
357 MAC_CHECK(setlabel_vnode_extattr, cred, vp, vp->v_label, intlabel);
358
359 if (error) {
360 VOP_CLOSEEXTATTR(vp, 0, NOCRED, curthread);
361 return (error);
362 }
363
364 error = VOP_CLOSEEXTATTR(vp, 1, NOCRED, curthread);
365
366 if (error == EOPNOTSUPP)
367 error = 0; /* XXX */
368
369 return (error);
370 }
371
372 void
373 mac_execve_transition(struct ucred *old, struct ucred *new, struct vnode *vp,
374 struct label *interpvnodelabel, struct image_params *imgp)
375 {
376
377 ASSERT_VOP_LOCKED(vp, "mac_execve_transition");
378
379 if (!mac_enforce_process && !mac_enforce_fs)
380 return;
381
382 MAC_PERFORM(execve_transition, old, new, vp, vp->v_label,
383 interpvnodelabel, imgp, imgp->execlabel);
384 }
385
386 int
387 mac_execve_will_transition(struct ucred *old, struct vnode *vp,
388 struct label *interpvnodelabel, struct image_params *imgp)
389 {
390 int result;
391
392 ASSERT_VOP_LOCKED(vp, "mac_execve_will_transition");
393
394 if (!mac_enforce_process && !mac_enforce_fs)
395 return (0);
396
397 result = 0;
398 MAC_BOOLEAN(execve_will_transition, ||, old, vp, vp->v_label,
399 interpvnodelabel, imgp, imgp->execlabel);
400
401 return (result);
402 }
403
404 int
405 mac_check_vnode_access(struct ucred *cred, struct vnode *vp, int acc_mode)
406 {
407 int error;
408
409 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_access");
410
411 if (!mac_enforce_fs)
412 return (0);
413
414 MAC_CHECK(check_vnode_access, cred, vp, vp->v_label, acc_mode);
415 return (error);
416 }
417
418 int
419 mac_check_vnode_chdir(struct ucred *cred, struct vnode *dvp)
420 {
421 int error;
422
423 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_chdir");
424
425 if (!mac_enforce_fs)
426 return (0);
427
428 MAC_CHECK(check_vnode_chdir, cred, dvp, dvp->v_label);
429 return (error);
430 }
431
432 int
433 mac_check_vnode_chroot(struct ucred *cred, struct vnode *dvp)
434 {
435 int error;
436
437 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_chroot");
438
439 if (!mac_enforce_fs)
440 return (0);
441
442 MAC_CHECK(check_vnode_chroot, cred, dvp, dvp->v_label);
443 return (error);
444 }
445
446 int
447 mac_check_vnode_create(struct ucred *cred, struct vnode *dvp,
448 struct componentname *cnp, struct vattr *vap)
449 {
450 int error;
451
452 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_create");
453
454 if (!mac_enforce_fs)
455 return (0);
456
457 MAC_CHECK(check_vnode_create, cred, dvp, dvp->v_label, cnp, vap);
458 return (error);
459 }
460
461 int
462 mac_check_vnode_delete(struct ucred *cred, struct vnode *dvp, struct vnode *vp,
463 struct componentname *cnp)
464 {
465 int error;
466
467 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_delete");
468 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_delete");
469
470 if (!mac_enforce_fs)
471 return (0);
472
473 MAC_CHECK(check_vnode_delete, cred, dvp, dvp->v_label, vp,
474 vp->v_label, cnp);
475 return (error);
476 }
477
478 int
479 mac_check_vnode_deleteacl(struct ucred *cred, struct vnode *vp,
480 acl_type_t type)
481 {
482 int error;
483
484 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_deleteacl");
485
486 if (!mac_enforce_fs)
487 return (0);
488
489 MAC_CHECK(check_vnode_deleteacl, cred, vp, vp->v_label, type);
490 return (error);
491 }
492
493 int
494 mac_check_vnode_deleteextattr(struct ucred *cred, struct vnode *vp,
495 int attrnamespace, const char *name)
496 {
497 int error;
498
499 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_deleteextattr");
500
501 if (!mac_enforce_fs)
502 return (0);
503
504 MAC_CHECK(check_vnode_deleteextattr, cred, vp, vp->v_label,
505 attrnamespace, name);
506 return (error);
507 }
508
509 int
510 mac_check_vnode_exec(struct ucred *cred, struct vnode *vp,
511 struct image_params *imgp)
512 {
513 int error;
514
515 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_exec");
516
517 if (!mac_enforce_process && !mac_enforce_fs)
518 return (0);
519
520 MAC_CHECK(check_vnode_exec, cred, vp, vp->v_label, imgp,
521 imgp->execlabel);
522
523 return (error);
524 }
525
526 int
527 mac_check_vnode_getacl(struct ucred *cred, struct vnode *vp, acl_type_t type)
528 {
529 int error;
530
531 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_getacl");
532
533 if (!mac_enforce_fs)
534 return (0);
535
536 MAC_CHECK(check_vnode_getacl, cred, vp, vp->v_label, type);
537 return (error);
538 }
539
540 int
541 mac_check_vnode_getextattr(struct ucred *cred, struct vnode *vp,
542 int attrnamespace, const char *name, struct uio *uio)
543 {
544 int error;
545
546 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_getextattr");
547
548 if (!mac_enforce_fs)
549 return (0);
550
551 MAC_CHECK(check_vnode_getextattr, cred, vp, vp->v_label,
552 attrnamespace, name, uio);
553 return (error);
554 }
555
556 int
557 mac_check_vnode_link(struct ucred *cred, struct vnode *dvp,
558 struct vnode *vp, struct componentname *cnp)
559 {
560 int error;
561
562 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_link");
563 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_link");
564
565 if (!mac_enforce_fs)
566 return (0);
567
568 MAC_CHECK(check_vnode_link, cred, dvp, dvp->v_label, vp,
569 vp->v_label, cnp);
570 return (error);
571 }
572
573 int
574 mac_check_vnode_listextattr(struct ucred *cred, struct vnode *vp,
575 int attrnamespace)
576 {
577 int error;
578
579 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_listextattr");
580
581 if (!mac_enforce_fs)
582 return (0);
583
584 MAC_CHECK(check_vnode_listextattr, cred, vp, vp->v_label,
585 attrnamespace);
586 return (error);
587 }
588
589 int
590 mac_check_vnode_lookup(struct ucred *cred, struct vnode *dvp,
591 struct componentname *cnp)
592 {
593 int error;
594
595 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_lookup");
596
597 if (!mac_enforce_fs)
598 return (0);
599
600 MAC_CHECK(check_vnode_lookup, cred, dvp, dvp->v_label, cnp);
601 return (error);
602 }
603
604 int
605 mac_check_vnode_mmap(struct ucred *cred, struct vnode *vp,
606 int prot, int flags)
607 {
608 int error;
609
610 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mmap");
611
612 if (!mac_enforce_fs || !mac_enforce_vm)
613 return (0);
614
615 MAC_CHECK(check_vnode_mmap, cred, vp, vp->v_label, prot, flags);
616 return (error);
617 }
618
619 void
620 mac_check_vnode_mmap_downgrade(struct ucred *cred, struct vnode *vp, int *prot)
621 {
622 int result = *prot;
623
624 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mmap_downgrade");
625
626 if (!mac_enforce_fs || !mac_enforce_vm)
627 return;
628
629 MAC_PERFORM(check_vnode_mmap_downgrade, cred, vp, vp->v_label,
630 &result);
631
632 *prot = result;
633 }
634
635 int
636 mac_check_vnode_mprotect(struct ucred *cred, struct vnode *vp, int prot)
637 {
638 int error;
639
640 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mprotect");
641
642 if (!mac_enforce_fs || !mac_enforce_vm)
643 return (0);
644
645 MAC_CHECK(check_vnode_mprotect, cred, vp, vp->v_label, prot);
646 return (error);
647 }
648
649 int
650 mac_check_vnode_open(struct ucred *cred, struct vnode *vp, int acc_mode)
651 {
652 int error;
653
654 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_open");
655
656 if (!mac_enforce_fs)
657 return (0);
658
659 MAC_CHECK(check_vnode_open, cred, vp, vp->v_label, acc_mode);
660 return (error);
661 }
662
663 int
664 mac_check_vnode_poll(struct ucred *active_cred, struct ucred *file_cred,
665 struct vnode *vp)
666 {
667 int error;
668
669 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_poll");
670
671 if (!mac_enforce_fs)
672 return (0);
673
674 MAC_CHECK(check_vnode_poll, active_cred, file_cred, vp,
675 vp->v_label);
676
677 return (error);
678 }
679
680 int
681 mac_check_vnode_read(struct ucred *active_cred, struct ucred *file_cred,
682 struct vnode *vp)
683 {
684 int error;
685
686 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_read");
687
688 if (!mac_enforce_fs)
689 return (0);
690
691 MAC_CHECK(check_vnode_read, active_cred, file_cred, vp,
692 vp->v_label);
693
694 return (error);
695 }
696
697 int
698 mac_check_vnode_readdir(struct ucred *cred, struct vnode *dvp)
699 {
700 int error;
701
702 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_readdir");
703
704 if (!mac_enforce_fs)
705 return (0);
706
707 MAC_CHECK(check_vnode_readdir, cred, dvp, dvp->v_label);
708 return (error);
709 }
710
711 int
712 mac_check_vnode_readlink(struct ucred *cred, struct vnode *vp)
713 {
714 int error;
715
716 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_readlink");
717
718 if (!mac_enforce_fs)
719 return (0);
720
721 MAC_CHECK(check_vnode_readlink, cred, vp, vp->v_label);
722 return (error);
723 }
724
725 static int
726 mac_check_vnode_relabel(struct ucred *cred, struct vnode *vp,
727 struct label *newlabel)
728 {
729 int error;
730
731 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_relabel");
732
733 MAC_CHECK(check_vnode_relabel, cred, vp, vp->v_label, newlabel);
734
735 return (error);
736 }
737
738 int
739 mac_check_vnode_rename_from(struct ucred *cred, struct vnode *dvp,
740 struct vnode *vp, struct componentname *cnp)
741 {
742 int error;
743
744 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_rename_from");
745 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_rename_from");
746
747 if (!mac_enforce_fs)
748 return (0);
749
750 MAC_CHECK(check_vnode_rename_from, cred, dvp, dvp->v_label, vp,
751 vp->v_label, cnp);
752 return (error);
753 }
754
755 int
756 mac_check_vnode_rename_to(struct ucred *cred, struct vnode *dvp,
757 struct vnode *vp, int samedir, struct componentname *cnp)
758 {
759 int error;
760
761 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_rename_to");
762 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_rename_to");
763
764 if (!mac_enforce_fs)
765 return (0);
766
767 MAC_CHECK(check_vnode_rename_to, cred, dvp, dvp->v_label, vp,
768 vp != NULL ? vp->v_label : NULL, samedir, cnp);
769 return (error);
770 }
771
772 int
773 mac_check_vnode_revoke(struct ucred *cred, struct vnode *vp)
774 {
775 int error;
776
777 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_revoke");
778
779 if (!mac_enforce_fs)
780 return (0);
781
782 MAC_CHECK(check_vnode_revoke, cred, vp, vp->v_label);
783 return (error);
784 }
785
786 int
787 mac_check_vnode_setacl(struct ucred *cred, struct vnode *vp, acl_type_t type,
788 struct acl *acl)
789 {
790 int error;
791
792 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setacl");
793
794 if (!mac_enforce_fs)
795 return (0);
796
797 MAC_CHECK(check_vnode_setacl, cred, vp, vp->v_label, type, acl);
798 return (error);
799 }
800
801 int
802 mac_check_vnode_setextattr(struct ucred *cred, struct vnode *vp,
803 int attrnamespace, const char *name, struct uio *uio)
804 {
805 int error;
806
807 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setextattr");
808
809 if (!mac_enforce_fs)
810 return (0);
811
812 MAC_CHECK(check_vnode_setextattr, cred, vp, vp->v_label,
813 attrnamespace, name, uio);
814 return (error);
815 }
816
817 int
818 mac_check_vnode_setflags(struct ucred *cred, struct vnode *vp, u_long flags)
819 {
820 int error;
821
822 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setflags");
823
824 if (!mac_enforce_fs)
825 return (0);
826
827 MAC_CHECK(check_vnode_setflags, cred, vp, vp->v_label, flags);
828 return (error);
829 }
830
831 int
832 mac_check_vnode_setmode(struct ucred *cred, struct vnode *vp, mode_t mode)
833 {
834 int error;
835
836 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setmode");
837
838 if (!mac_enforce_fs)
839 return (0);
840
841 MAC_CHECK(check_vnode_setmode, cred, vp, vp->v_label, mode);
842 return (error);
843 }
844
845 int
846 mac_check_vnode_setowner(struct ucred *cred, struct vnode *vp, uid_t uid,
847 gid_t gid)
848 {
849 int error;
850
851 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setowner");
852
853 if (!mac_enforce_fs)
854 return (0);
855
856 MAC_CHECK(check_vnode_setowner, cred, vp, vp->v_label, uid, gid);
857 return (error);
858 }
859
860 int
861 mac_check_vnode_setutimes(struct ucred *cred, struct vnode *vp,
862 struct timespec atime, struct timespec mtime)
863 {
864 int error;
865
866 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setutimes");
867
868 if (!mac_enforce_fs)
869 return (0);
870
871 MAC_CHECK(check_vnode_setutimes, cred, vp, vp->v_label, atime,
872 mtime);
873 return (error);
874 }
875
876 int
877 mac_check_vnode_stat(struct ucred *active_cred, struct ucred *file_cred,
878 struct vnode *vp)
879 {
880 int error;
881
882 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_stat");
883
884 if (!mac_enforce_fs)
885 return (0);
886
887 MAC_CHECK(check_vnode_stat, active_cred, file_cred, vp,
888 vp->v_label);
889 return (error);
890 }
891
892 int
893 mac_check_vnode_write(struct ucred *active_cred, struct ucred *file_cred,
894 struct vnode *vp)
895 {
896 int error;
897
898 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_write");
899
900 if (!mac_enforce_fs)
901 return (0);
902
903 MAC_CHECK(check_vnode_write, active_cred, file_cred, vp,
904 vp->v_label);
905
906 return (error);
907 }
908
909 void
910 mac_relabel_vnode(struct ucred *cred, struct vnode *vp, struct label *newlabel)
911 {
912
913 MAC_PERFORM(relabel_vnode, cred, vp, vp->v_label, newlabel);
914 }
915
916 void
917 mac_create_mount(struct ucred *cred, struct mount *mp)
918 {
919
920 MAC_PERFORM(create_mount, cred, mp, mp->mnt_mntlabel,
921 mp->mnt_fslabel);
922 }
923
924 int
925 mac_check_mount_stat(struct ucred *cred, struct mount *mount)
926 {
927 int error;
928
929 if (!mac_enforce_fs)
930 return (0);
931
932 MAC_CHECK(check_mount_stat, cred, mount, mount->mnt_mntlabel);
933
934 return (error);
935 }
936
937 void
938 mac_create_devfs_device(struct ucred *cred, struct mount *mp,
939 struct cdev *dev, struct devfs_dirent *de)
940 {
941
942 MAC_PERFORM(create_devfs_device, cred, mp, dev, de, de->de_label);
943 }
944
945 void
946 mac_create_devfs_symlink(struct ucred *cred, struct mount *mp,
947 struct devfs_dirent *dd, struct devfs_dirent *de)
948 {
949
950 MAC_PERFORM(create_devfs_symlink, cred, mp, dd, dd->de_label, de,
951 de->de_label);
952 }
953
954 void
955 mac_create_devfs_directory(struct mount *mp, char *dirname, int dirnamelen,
956 struct devfs_dirent *de)
957 {
958
959 MAC_PERFORM(create_devfs_directory, mp, dirname, dirnamelen, de,
960 de->de_label);
961 }
962
963 /*
964 * Implementation of VOP_SETLABEL() that relies on extended attributes
965 * to store label data. Can be referenced by filesystems supporting
966 * extended attributes.
967 */
968 int
969 vop_stdsetlabel_ea(struct vop_setlabel_args *ap)
970 {
971 struct vnode *vp = ap->a_vp;
972 struct label *intlabel = ap->a_label;
973 int error;
974
975 ASSERT_VOP_LOCKED(vp, "vop_stdsetlabel_ea");
976
977 if ((vp->v_mount->mnt_flag & MNT_MULTILABEL) == 0)
978 return (EOPNOTSUPP);
979
980 error = mac_setlabel_vnode_extattr(ap->a_cred, vp, intlabel);
981 if (error)
982 return (error);
983
984 mac_relabel_vnode(ap->a_cred, vp, intlabel);
985
986 return (0);
987 }
988
989 int
990 vn_setlabel(struct vnode *vp, struct label *intlabel, struct ucred *cred)
991 {
992 int error;
993
994 if (vp->v_mount == NULL) {
995 /* printf("vn_setlabel: null v_mount\n"); */
996 if (vp->v_type != VNON)
997 printf("vn_setlabel: null v_mount with non-VNON\n");
998 return (EBADF);
999 }
1000
1001 if ((vp->v_mount->mnt_flag & MNT_MULTILABEL) == 0)
1002 return (EOPNOTSUPP);
1003
1004 /*
1005 * Multi-phase commit. First check the policies to confirm the
1006 * change is OK. Then commit via the filesystem. Finally,
1007 * update the actual vnode label. Question: maybe the filesystem
1008 * should update the vnode at the end as part of VOP_SETLABEL()?
1009 */
1010 error = mac_check_vnode_relabel(cred, vp, intlabel);
1011 if (error)
1012 return (error);
1013
1014 /*
1015 * VADMIN provides the opportunity for the filesystem to make
1016 * decisions about who is and is not able to modify labels
1017 * and protections on files. This might not be right. We can't
1018 * assume VOP_SETLABEL() will do it, because we might implement
1019 * that as part of vop_stdsetlabel_ea().
1020 */
1021 error = VOP_ACCESS(vp, VADMIN, cred, curthread);
1022 if (error)
1023 return (error);
1024
1025 error = VOP_SETLABEL(vp, intlabel, cred, curthread);
1026 if (error)
1027 return (error);
1028
1029 return (0);
1030 }
1031
1032 void
1033 mac_associate_nfsd_label(struct ucred *cred)
1034 {
1035
1036 MAC_PERFORM(associate_nfsd_label, cred);
1037 }
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