1 /*-
2 * Copyright (c) 1999-2002, 2009 Robert N. M. Watson
3 * Copyright (c) 2001 Ilmar S. Habibulin
4 * Copyright (c) 2001-2005 McAfee, Inc.
5 * Copyright (c) 2005-2006 SPARTA, Inc.
6 * Copyright (c) 2008 Apple Inc.
7 * All rights reserved.
8 *
9 * This software was developed by Robert Watson and Ilmar Habibulin for the
10 * TrustedBSD Project.
11 *
12 * This software was developed for the FreeBSD Project in part by McAfee
13 * Research, the Security Research Division of McAfee, Inc. under
14 * DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA
15 * CHATS research program.
16 *
17 * This software was enhanced by SPARTA ISSO under SPAWAR contract
18 * N66001-04-C-6019 ("SEFOS").
19 *
20 * This software was developed at the University of Cambridge Computer
21 * Laboratory with support from a grant from Google, Inc.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the above copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 *
32 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
33 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
34 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
35 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
36 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
37 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
38 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
39 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
40 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
41 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
42 * SUCH DAMAGE.
43 */
44
45 #include <sys/cdefs.h>
46 __FBSDID("$FreeBSD: releng/10.0/sys/security/mac/mac_vfs.c 255971 2013-10-01 15:40:27Z markj $");
47
48 #include "opt_kdtrace.h"
49 #include "opt_mac.h"
50
51 #include <sys/param.h>
52 #include <sys/condvar.h>
53 #include <sys/extattr.h>
54 #include <sys/imgact.h>
55 #include <sys/kernel.h>
56 #include <sys/lock.h>
57 #include <sys/malloc.h>
58 #include <sys/mutex.h>
59 #include <sys/proc.h>
60 #include <sys/sbuf.h>
61 #include <sys/systm.h>
62 #include <sys/vnode.h>
63 #include <sys/mount.h>
64 #include <sys/file.h>
65 #include <sys/namei.h>
66 #include <sys/sdt.h>
67 #include <sys/sysctl.h>
68
69 #include <vm/vm.h>
70 #include <vm/pmap.h>
71 #include <vm/vm_map.h>
72 #include <vm/vm_object.h>
73
74 #include <fs/devfs/devfs.h>
75
76 #include <security/mac/mac_framework.h>
77 #include <security/mac/mac_internal.h>
78 #include <security/mac/mac_policy.h>
79
80 /*
81 * Warn about EA transactions only the first time they happen. No locking on
82 * this variable.
83 */
84 static int ea_warn_once = 0;
85
86 static int mac_vnode_setlabel_extattr(struct ucred *cred,
87 struct vnode *vp, struct label *intlabel);
88
89 static struct label *
90 mac_devfs_label_alloc(void)
91 {
92 struct label *label;
93
94 label = mac_labelzone_alloc(M_WAITOK);
95 MAC_POLICY_PERFORM(devfs_init_label, label);
96 return (label);
97 }
98
99 void
100 mac_devfs_init(struct devfs_dirent *de)
101 {
102
103 if (mac_labeled & MPC_OBJECT_DEVFS)
104 de->de_label = mac_devfs_label_alloc();
105 else
106 de->de_label = NULL;
107 }
108
109 static struct label *
110 mac_mount_label_alloc(void)
111 {
112 struct label *label;
113
114 label = mac_labelzone_alloc(M_WAITOK);
115 MAC_POLICY_PERFORM(mount_init_label, label);
116 return (label);
117 }
118
119 void
120 mac_mount_init(struct mount *mp)
121 {
122
123 if (mac_labeled & MPC_OBJECT_MOUNT)
124 mp->mnt_label = mac_mount_label_alloc();
125 else
126 mp->mnt_label = NULL;
127 }
128
129 struct label *
130 mac_vnode_label_alloc(void)
131 {
132 struct label *label;
133
134 label = mac_labelzone_alloc(M_WAITOK);
135 MAC_POLICY_PERFORM(vnode_init_label, label);
136 return (label);
137 }
138
139 void
140 mac_vnode_init(struct vnode *vp)
141 {
142
143 if (mac_labeled & MPC_OBJECT_VNODE)
144 vp->v_label = mac_vnode_label_alloc();
145 else
146 vp->v_label = NULL;
147 }
148
149 static void
150 mac_devfs_label_free(struct label *label)
151 {
152
153 MAC_POLICY_PERFORM_NOSLEEP(devfs_destroy_label, label);
154 mac_labelzone_free(label);
155 }
156
157 void
158 mac_devfs_destroy(struct devfs_dirent *de)
159 {
160
161 if (de->de_label != NULL) {
162 mac_devfs_label_free(de->de_label);
163 de->de_label = NULL;
164 }
165 }
166
167 static void
168 mac_mount_label_free(struct label *label)
169 {
170
171 MAC_POLICY_PERFORM_NOSLEEP(mount_destroy_label, label);
172 mac_labelzone_free(label);
173 }
174
175 void
176 mac_mount_destroy(struct mount *mp)
177 {
178
179 if (mp->mnt_label != NULL) {
180 mac_mount_label_free(mp->mnt_label);
181 mp->mnt_label = NULL;
182 }
183 }
184
185 void
186 mac_vnode_label_free(struct label *label)
187 {
188
189 MAC_POLICY_PERFORM_NOSLEEP(vnode_destroy_label, label);
190 mac_labelzone_free(label);
191 }
192
193 void
194 mac_vnode_destroy(struct vnode *vp)
195 {
196
197 if (vp->v_label != NULL) {
198 mac_vnode_label_free(vp->v_label);
199 vp->v_label = NULL;
200 }
201 }
202
203 void
204 mac_vnode_copy_label(struct label *src, struct label *dest)
205 {
206
207 MAC_POLICY_PERFORM_NOSLEEP(vnode_copy_label, src, dest);
208 }
209
210 int
211 mac_vnode_externalize_label(struct label *label, char *elements,
212 char *outbuf, size_t outbuflen)
213 {
214 int error;
215
216 MAC_POLICY_EXTERNALIZE(vnode, label, elements, outbuf, outbuflen);
217
218 return (error);
219 }
220
221 int
222 mac_vnode_internalize_label(struct label *label, char *string)
223 {
224 int error;
225
226 MAC_POLICY_INTERNALIZE(vnode, label, string);
227
228 return (error);
229 }
230
231 void
232 mac_devfs_update(struct mount *mp, struct devfs_dirent *de, struct vnode *vp)
233 {
234
235 MAC_POLICY_PERFORM_NOSLEEP(devfs_update, mp, de, de->de_label, vp,
236 vp->v_label);
237 }
238
239 void
240 mac_devfs_vnode_associate(struct mount *mp, struct devfs_dirent *de,
241 struct vnode *vp)
242 {
243
244 MAC_POLICY_PERFORM_NOSLEEP(devfs_vnode_associate, mp, mp->mnt_label,
245 de, de->de_label, vp, vp->v_label);
246 }
247
248 int
249 mac_vnode_associate_extattr(struct mount *mp, struct vnode *vp)
250 {
251 int error;
252
253 ASSERT_VOP_LOCKED(vp, "mac_vnode_associate_extattr");
254
255 MAC_POLICY_CHECK(vnode_associate_extattr, mp, mp->mnt_label, vp,
256 vp->v_label);
257
258 return (error);
259 }
260
261 void
262 mac_vnode_associate_singlelabel(struct mount *mp, struct vnode *vp)
263 {
264
265 MAC_POLICY_PERFORM_NOSLEEP(vnode_associate_singlelabel, mp,
266 mp->mnt_label, vp, vp->v_label);
267 }
268
269 /*
270 * Functions implementing extended-attribute backed labels for file systems
271 * that support it.
272 *
273 * Where possible, we use EA transactions to make writes to multiple
274 * attributes across difference policies mutually atomic. We allow work to
275 * continue on file systems not supporting EA transactions, but generate a
276 * printf warning.
277 */
278 int
279 mac_vnode_create_extattr(struct ucred *cred, struct mount *mp,
280 struct vnode *dvp, struct vnode *vp, struct componentname *cnp)
281 {
282 int error;
283
284 ASSERT_VOP_LOCKED(dvp, "mac_vnode_create_extattr");
285 ASSERT_VOP_LOCKED(vp, "mac_vnode_create_extattr");
286
287 error = VOP_OPENEXTATTR(vp, cred, curthread);
288 if (error == EOPNOTSUPP) {
289 if (ea_warn_once == 0) {
290 printf("Warning: transactions not supported "
291 "in EA write.\n");
292 ea_warn_once = 1;
293 }
294 } else if (error)
295 return (error);
296
297 MAC_POLICY_CHECK(vnode_create_extattr, cred, mp, mp->mnt_label, dvp,
298 dvp->v_label, vp, vp->v_label, cnp);
299
300 if (error) {
301 VOP_CLOSEEXTATTR(vp, 0, NOCRED, curthread);
302 return (error);
303 }
304
305 error = VOP_CLOSEEXTATTR(vp, 1, NOCRED, curthread);
306 if (error == EOPNOTSUPP)
307 error = 0;
308
309 return (error);
310 }
311
312 static int
313 mac_vnode_setlabel_extattr(struct ucred *cred, struct vnode *vp,
314 struct label *intlabel)
315 {
316 int error;
317
318 ASSERT_VOP_LOCKED(vp, "mac_vnode_setlabel_extattr");
319
320 error = VOP_OPENEXTATTR(vp, cred, curthread);
321 if (error == EOPNOTSUPP) {
322 if (ea_warn_once == 0) {
323 printf("Warning: transactions not supported "
324 "in EA write.\n");
325 ea_warn_once = 1;
326 }
327 } else if (error)
328 return (error);
329
330 MAC_POLICY_CHECK(vnode_setlabel_extattr, cred, vp, vp->v_label,
331 intlabel);
332
333 if (error) {
334 VOP_CLOSEEXTATTR(vp, 0, NOCRED, curthread);
335 return (error);
336 }
337
338 error = VOP_CLOSEEXTATTR(vp, 1, NOCRED, curthread);
339 if (error == EOPNOTSUPP)
340 error = 0;
341
342 return (error);
343 }
344
345 void
346 mac_vnode_execve_transition(struct ucred *old, struct ucred *new,
347 struct vnode *vp, struct label *interpvplabel, struct image_params *imgp)
348 {
349
350 ASSERT_VOP_LOCKED(vp, "mac_vnode_execve_transition");
351
352 MAC_POLICY_PERFORM(vnode_execve_transition, old, new, vp,
353 vp->v_label, interpvplabel, imgp, imgp->execlabel);
354 }
355
356 int
357 mac_vnode_execve_will_transition(struct ucred *old, struct vnode *vp,
358 struct label *interpvplabel, struct image_params *imgp)
359 {
360 int result;
361
362 ASSERT_VOP_LOCKED(vp, "mac_vnode_execve_will_transition");
363
364 result = 0;
365 /* No sleeping since the process lock will be held by the caller. */
366 MAC_POLICY_BOOLEAN_NOSLEEP(vnode_execve_will_transition, ||, old, vp,
367 vp->v_label, interpvplabel, imgp, imgp->execlabel);
368
369 return (result);
370 }
371
372 MAC_CHECK_PROBE_DEFINE3(vnode_check_access, "struct ucred *",
373 "struct vnode *", "accmode_t");
374
375 int
376 mac_vnode_check_access(struct ucred *cred, struct vnode *vp, accmode_t accmode)
377 {
378 int error;
379
380 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_access");
381
382 MAC_POLICY_CHECK(vnode_check_access, cred, vp, vp->v_label, accmode);
383 MAC_CHECK_PROBE3(vnode_check_access, error, cred, vp, accmode);
384
385 return (error);
386 }
387
388 MAC_CHECK_PROBE_DEFINE2(vnode_check_chdir, "struct ucred *",
389 "struct vnode *");
390
391 int
392 mac_vnode_check_chdir(struct ucred *cred, struct vnode *dvp)
393 {
394 int error;
395
396 ASSERT_VOP_LOCKED(dvp, "mac_vnode_check_chdir");
397
398 MAC_POLICY_CHECK(vnode_check_chdir, cred, dvp, dvp->v_label);
399 MAC_CHECK_PROBE2(vnode_check_chdir, error, cred, dvp);
400
401 return (error);
402 }
403
404 MAC_CHECK_PROBE_DEFINE2(vnode_check_chroot, "struct ucred *",
405 "struct vnode *");
406
407 int
408 mac_vnode_check_chroot(struct ucred *cred, struct vnode *dvp)
409 {
410 int error;
411
412 ASSERT_VOP_LOCKED(dvp, "mac_vnode_check_chroot");
413
414 MAC_POLICY_CHECK(vnode_check_chroot, cred, dvp, dvp->v_label);
415 MAC_CHECK_PROBE2(vnode_check_chroot, error, cred, dvp);
416
417 return (error);
418 }
419
420 MAC_CHECK_PROBE_DEFINE4(vnode_check_create, "struct ucred *",
421 "struct vnode *", "struct componentname *", "struct vattr *");
422
423 int
424 mac_vnode_check_create(struct ucred *cred, struct vnode *dvp,
425 struct componentname *cnp, struct vattr *vap)
426 {
427 int error;
428
429 ASSERT_VOP_LOCKED(dvp, "mac_vnode_check_create");
430
431 MAC_POLICY_CHECK(vnode_check_create, cred, dvp, dvp->v_label, cnp,
432 vap);
433 MAC_CHECK_PROBE4(vnode_check_create, error, cred, dvp, cnp, vap);
434
435 return (error);
436 }
437
438 MAC_CHECK_PROBE_DEFINE3(vnode_check_deleteacl, "struct ucred *",
439 "struct vnode *", "acl_type_t");
440
441 int
442 mac_vnode_check_deleteacl(struct ucred *cred, struct vnode *vp,
443 acl_type_t type)
444 {
445 int error;
446
447 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_deleteacl");
448
449 MAC_POLICY_CHECK(vnode_check_deleteacl, cred, vp, vp->v_label, type);
450 MAC_CHECK_PROBE3(vnode_check_deleteacl, error, cred, vp, type);
451
452 return (error);
453 }
454
455 MAC_CHECK_PROBE_DEFINE4(vnode_check_deleteextattr, "struct ucred *",
456 "struct vnode *", "int", "const char *");
457
458 int
459 mac_vnode_check_deleteextattr(struct ucred *cred, struct vnode *vp,
460 int attrnamespace, const char *name)
461 {
462 int error;
463
464 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_deleteextattr");
465
466 MAC_POLICY_CHECK(vnode_check_deleteextattr, cred, vp, vp->v_label,
467 attrnamespace, name);
468 MAC_CHECK_PROBE4(vnode_check_deleteextattr, error, cred, vp,
469 attrnamespace, name);
470
471 return (error);
472 }
473
474 MAC_CHECK_PROBE_DEFINE3(vnode_check_exec, "struct ucred *", "struct vnode *",
475 "struct image_params *");
476
477 int
478 mac_vnode_check_exec(struct ucred *cred, struct vnode *vp,
479 struct image_params *imgp)
480 {
481 int error;
482
483 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_exec");
484
485 MAC_POLICY_CHECK(vnode_check_exec, cred, vp, vp->v_label, imgp,
486 imgp->execlabel);
487 MAC_CHECK_PROBE3(vnode_check_exec, error, cred, vp, imgp);
488
489 return (error);
490 }
491
492 MAC_CHECK_PROBE_DEFINE3(vnode_check_getacl, "struct ucred *",
493 "struct vnode *", "acl_type_t");
494
495 int
496 mac_vnode_check_getacl(struct ucred *cred, struct vnode *vp, acl_type_t type)
497 {
498 int error;
499
500 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_getacl");
501
502 MAC_POLICY_CHECK(vnode_check_getacl, cred, vp, vp->v_label, type);
503 MAC_CHECK_PROBE3(vnode_check_getacl, error, cred, vp, type);
504
505 return (error);
506 }
507
508 MAC_CHECK_PROBE_DEFINE4(vnode_check_getextattr, "struct ucred *",
509 "struct vnode *", "int", "const char *");
510
511 int
512 mac_vnode_check_getextattr(struct ucred *cred, struct vnode *vp,
513 int attrnamespace, const char *name)
514 {
515 int error;
516
517 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_getextattr");
518
519 MAC_POLICY_CHECK(vnode_check_getextattr, cred, vp, vp->v_label,
520 attrnamespace, name);
521 MAC_CHECK_PROBE4(vnode_check_getextattr, error, cred, vp,
522 attrnamespace, name);
523
524 return (error);
525 }
526
527 MAC_CHECK_PROBE_DEFINE4(vnode_check_link, "struct ucred *", "struct vnode *",
528 "struct vnode *", "struct componentname *");
529
530 int
531 mac_vnode_check_link(struct ucred *cred, struct vnode *dvp,
532 struct vnode *vp, struct componentname *cnp)
533 {
534 int error;
535
536 ASSERT_VOP_LOCKED(dvp, "mac_vnode_check_link");
537 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_link");
538
539 MAC_POLICY_CHECK(vnode_check_link, cred, dvp, dvp->v_label, vp,
540 vp->v_label, cnp);
541 MAC_CHECK_PROBE4(vnode_check_link, error, cred, dvp, vp, cnp);
542
543 return (error);
544 }
545
546 MAC_CHECK_PROBE_DEFINE3(vnode_check_listextattr, "struct ucred *",
547 "struct vnode *", "int");
548
549 int
550 mac_vnode_check_listextattr(struct ucred *cred, struct vnode *vp,
551 int attrnamespace)
552 {
553 int error;
554
555 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_listextattr");
556
557 MAC_POLICY_CHECK(vnode_check_listextattr, cred, vp, vp->v_label,
558 attrnamespace);
559 MAC_CHECK_PROBE3(vnode_check_listextattr, error, cred, vp,
560 attrnamespace);
561
562 return (error);
563 }
564
565 MAC_CHECK_PROBE_DEFINE3(vnode_check_lookup, "struct ucred *",
566 "struct vnode *", "struct componentname *");
567
568 int
569 mac_vnode_check_lookup(struct ucred *cred, struct vnode *dvp,
570 struct componentname *cnp)
571 {
572 int error;
573
574 ASSERT_VOP_LOCKED(dvp, "mac_vnode_check_lookup");
575
576 MAC_POLICY_CHECK(vnode_check_lookup, cred, dvp, dvp->v_label, cnp);
577 MAC_CHECK_PROBE3(vnode_check_lookup, error, cred, dvp, cnp);
578
579 return (error);
580 }
581
582 MAC_CHECK_PROBE_DEFINE4(vnode_check_mmap, "struct ucred *", "struct vnode *",
583 "int", "int");
584
585 int
586 mac_vnode_check_mmap(struct ucred *cred, struct vnode *vp, int prot,
587 int flags)
588 {
589 int error;
590
591 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_mmap");
592
593 MAC_POLICY_CHECK(vnode_check_mmap, cred, vp, vp->v_label, prot, flags);
594 MAC_CHECK_PROBE4(vnode_check_mmap, error, cred, vp, prot, flags);
595
596 return (error);
597 }
598
599 void
600 mac_vnode_check_mmap_downgrade(struct ucred *cred, struct vnode *vp,
601 int *prot)
602 {
603 int result = *prot;
604
605 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_mmap_downgrade");
606
607 MAC_POLICY_PERFORM(vnode_check_mmap_downgrade, cred, vp, vp->v_label,
608 &result);
609
610 *prot = result;
611 }
612
613 MAC_CHECK_PROBE_DEFINE3(vnode_check_mprotect, "struct ucred *",
614 "struct vnode *", "int");
615
616 int
617 mac_vnode_check_mprotect(struct ucred *cred, struct vnode *vp, int prot)
618 {
619 int error;
620
621 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_mprotect");
622
623 MAC_POLICY_CHECK(vnode_check_mprotect, cred, vp, vp->v_label, prot);
624 MAC_CHECK_PROBE3(vnode_check_mprotect, error, cred, vp, prot);
625
626 return (error);
627 }
628
629 MAC_CHECK_PROBE_DEFINE3(vnode_check_open, "struct ucred *", "struct vnode *",
630 "accmode_t");
631
632 int
633 mac_vnode_check_open(struct ucred *cred, struct vnode *vp, accmode_t accmode)
634 {
635 int error;
636
637 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_open");
638
639 MAC_POLICY_CHECK(vnode_check_open, cred, vp, vp->v_label, accmode);
640 MAC_CHECK_PROBE3(vnode_check_open, error, cred, vp, accmode);
641
642 return (error);
643 }
644
645 MAC_CHECK_PROBE_DEFINE3(vnode_check_poll, "struct ucred *", "struct ucred *",
646 "struct vnode *");
647
648 int
649 mac_vnode_check_poll(struct ucred *active_cred, struct ucred *file_cred,
650 struct vnode *vp)
651 {
652 int error;
653
654 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_poll");
655
656 MAC_POLICY_CHECK(vnode_check_poll, active_cred, file_cred, vp,
657 vp->v_label);
658 MAC_CHECK_PROBE3(vnode_check_poll, error, active_cred, file_cred,
659 vp);
660
661 return (error);
662 }
663
664 MAC_CHECK_PROBE_DEFINE3(vnode_check_read, "struct ucred *", "struct ucred *",
665 "struct vnode *");
666
667 int
668 mac_vnode_check_read(struct ucred *active_cred, struct ucred *file_cred,
669 struct vnode *vp)
670 {
671 int error;
672
673 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_read");
674
675 MAC_POLICY_CHECK(vnode_check_read, active_cred, file_cred, vp,
676 vp->v_label);
677 MAC_CHECK_PROBE3(vnode_check_read, error, active_cred, file_cred,
678 vp);
679
680 return (error);
681 }
682
683 MAC_CHECK_PROBE_DEFINE2(vnode_check_readdir, "struct ucred *",
684 "struct vnode *");
685
686 int
687 mac_vnode_check_readdir(struct ucred *cred, struct vnode *dvp)
688 {
689 int error;
690
691 ASSERT_VOP_LOCKED(dvp, "mac_vnode_check_readdir");
692
693 MAC_POLICY_CHECK(vnode_check_readdir, cred, dvp, dvp->v_label);
694 MAC_CHECK_PROBE2(vnode_check_readdir, error, cred, dvp);
695
696 return (error);
697 }
698
699 MAC_CHECK_PROBE_DEFINE2(vnode_check_readlink, "struct ucred *",
700 "struct vnode *");
701
702 int
703 mac_vnode_check_readlink(struct ucred *cred, struct vnode *vp)
704 {
705 int error;
706
707 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_readlink");
708
709 MAC_POLICY_CHECK(vnode_check_readlink, cred, vp, vp->v_label);
710 MAC_CHECK_PROBE2(vnode_check_readlink, error, cred, vp);
711
712 return (error);
713 }
714
715 MAC_CHECK_PROBE_DEFINE3(vnode_check_relabel, "struct ucred *",
716 "struct vnode *", "struct label *");
717
718 static int
719 mac_vnode_check_relabel(struct ucred *cred, struct vnode *vp,
720 struct label *newlabel)
721 {
722 int error;
723
724 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_relabel");
725
726 MAC_POLICY_CHECK(vnode_check_relabel, cred, vp, vp->v_label, newlabel);
727 MAC_CHECK_PROBE3(vnode_check_relabel, error, cred, vp, newlabel);
728
729 return (error);
730 }
731
732 MAC_CHECK_PROBE_DEFINE4(vnode_check_rename_from, "struct ucred *",
733 "struct vnode *", "struct vnode *", "struct componentname *");
734
735 int
736 mac_vnode_check_rename_from(struct ucred *cred, struct vnode *dvp,
737 struct vnode *vp, struct componentname *cnp)
738 {
739 int error;
740
741 ASSERT_VOP_LOCKED(dvp, "mac_vnode_check_rename_from");
742 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_rename_from");
743
744 MAC_POLICY_CHECK(vnode_check_rename_from, cred, dvp, dvp->v_label, vp,
745 vp->v_label, cnp);
746 MAC_CHECK_PROBE4(vnode_check_rename_from, error, cred, dvp, vp, cnp);
747
748 return (error);
749 }
750
751 MAC_CHECK_PROBE_DEFINE4(vnode_check_rename_to, "struct ucred *",
752 "struct vnode *", "struct vnode *", "struct componentname *");
753
754 int
755 mac_vnode_check_rename_to(struct ucred *cred, struct vnode *dvp,
756 struct vnode *vp, int samedir, struct componentname *cnp)
757 {
758 int error;
759
760 ASSERT_VOP_LOCKED(dvp, "mac_vnode_check_rename_to");
761 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_rename_to");
762
763 MAC_POLICY_CHECK(vnode_check_rename_to, cred, dvp, dvp->v_label, vp,
764 vp != NULL ? vp->v_label : NULL, samedir, cnp);
765 MAC_CHECK_PROBE4(vnode_check_rename_to, error, cred, dvp, vp, cnp);
766 return (error);
767 }
768
769 MAC_CHECK_PROBE_DEFINE2(vnode_check_revoke, "struct ucred *",
770 "struct vnode *");
771
772 int
773 mac_vnode_check_revoke(struct ucred *cred, struct vnode *vp)
774 {
775 int error;
776
777 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_revoke");
778
779 MAC_POLICY_CHECK(vnode_check_revoke, cred, vp, vp->v_label);
780 MAC_CHECK_PROBE2(vnode_check_revoke, error, cred, vp);
781
782 return (error);
783 }
784
785 MAC_CHECK_PROBE_DEFINE4(vnode_check_setacl, "struct ucred *",
786 "struct vnode *", "acl_type_t", "struct acl *");
787
788 int
789 mac_vnode_check_setacl(struct ucred *cred, struct vnode *vp, acl_type_t type,
790 struct acl *acl)
791 {
792 int error;
793
794 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_setacl");
795
796 MAC_POLICY_CHECK(vnode_check_setacl, cred, vp, vp->v_label, type, acl);
797 MAC_CHECK_PROBE4(vnode_check_setacl, error, cred, vp, type, acl);
798
799 return (error);
800 }
801
802 MAC_CHECK_PROBE_DEFINE4(vnode_check_setextattr, "struct ucred *",
803 "struct vnode *", "int", "const char *");
804
805 int
806 mac_vnode_check_setextattr(struct ucred *cred, struct vnode *vp,
807 int attrnamespace, const char *name)
808 {
809 int error;
810
811 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_setextattr");
812
813 MAC_POLICY_CHECK(vnode_check_setextattr, cred, vp, vp->v_label,
814 attrnamespace, name);
815 MAC_CHECK_PROBE4(vnode_check_setextattr, error, cred, vp,
816 attrnamespace, name);
817
818 return (error);
819 }
820
821 MAC_CHECK_PROBE_DEFINE3(vnode_check_setflags, "struct ucred *",
822 "struct vnode *", "u_long");
823
824 int
825 mac_vnode_check_setflags(struct ucred *cred, struct vnode *vp, u_long flags)
826 {
827 int error;
828
829 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_setflags");
830
831 MAC_POLICY_CHECK(vnode_check_setflags, cred, vp, vp->v_label, flags);
832 MAC_CHECK_PROBE3(vnode_check_setflags, error, cred, vp, flags);
833
834 return (error);
835 }
836
837 MAC_CHECK_PROBE_DEFINE3(vnode_check_setmode, "struct ucred *",
838 "struct vnode *", "mode_t");
839
840 int
841 mac_vnode_check_setmode(struct ucred *cred, struct vnode *vp, mode_t mode)
842 {
843 int error;
844
845 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_setmode");
846
847 MAC_POLICY_CHECK(vnode_check_setmode, cred, vp, vp->v_label, mode);
848 MAC_CHECK_PROBE3(vnode_check_setmode, error, cred, vp, mode);
849
850 return (error);
851 }
852
853 MAC_CHECK_PROBE_DEFINE4(vnode_check_setowner, "struct ucred *",
854 "struct vnode *", "uid_t", "gid_t");
855
856 int
857 mac_vnode_check_setowner(struct ucred *cred, struct vnode *vp, uid_t uid,
858 gid_t gid)
859 {
860 int error;
861
862 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_setowner");
863
864 MAC_POLICY_CHECK(vnode_check_setowner, cred, vp, vp->v_label, uid, gid);
865 MAC_CHECK_PROBE4(vnode_check_setowner, error, cred, vp, uid, gid);
866
867 return (error);
868 }
869
870 MAC_CHECK_PROBE_DEFINE4(vnode_check_setutimes, "struct ucred *",
871 "struct vnode *", "struct timespec *", "struct timespec *");
872
873 int
874 mac_vnode_check_setutimes(struct ucred *cred, struct vnode *vp,
875 struct timespec atime, struct timespec mtime)
876 {
877 int error;
878
879 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_setutimes");
880
881 MAC_POLICY_CHECK(vnode_check_setutimes, cred, vp, vp->v_label, atime,
882 mtime);
883 MAC_CHECK_PROBE4(vnode_check_setutimes, error, cred, vp, &atime,
884 &mtime);
885
886 return (error);
887 }
888
889 MAC_CHECK_PROBE_DEFINE3(vnode_check_stat, "struct ucred *", "struct ucred *",
890 "struct vnode *");
891
892 int
893 mac_vnode_check_stat(struct ucred *active_cred, struct ucred *file_cred,
894 struct vnode *vp)
895 {
896 int error;
897
898 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_stat");
899
900 MAC_POLICY_CHECK(vnode_check_stat, active_cred, file_cred, vp,
901 vp->v_label);
902 MAC_CHECK_PROBE3(vnode_check_stat, error, active_cred, file_cred,
903 vp);
904
905 return (error);
906 }
907
908 MAC_CHECK_PROBE_DEFINE4(vnode_check_unlink, "struct ucred *",
909 "struct vnode *", "struct vnode *", "struct componentname *");
910
911 int
912 mac_vnode_check_unlink(struct ucred *cred, struct vnode *dvp,
913 struct vnode *vp, struct componentname *cnp)
914 {
915 int error;
916
917 ASSERT_VOP_LOCKED(dvp, "mac_vnode_check_unlink");
918 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_unlink");
919
920 MAC_POLICY_CHECK(vnode_check_unlink, cred, dvp, dvp->v_label, vp,
921 vp->v_label, cnp);
922 MAC_CHECK_PROBE4(vnode_check_unlink, error, cred, dvp, vp, cnp);
923
924 return (error);
925 }
926
927 MAC_CHECK_PROBE_DEFINE3(vnode_check_write, "struct ucred *",
928 "struct ucred *", "struct vnode *");
929
930 int
931 mac_vnode_check_write(struct ucred *active_cred, struct ucred *file_cred,
932 struct vnode *vp)
933 {
934 int error;
935
936 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_write");
937
938 MAC_POLICY_CHECK(vnode_check_write, active_cred, file_cred, vp,
939 vp->v_label);
940 MAC_CHECK_PROBE3(vnode_check_write, error, active_cred, file_cred,
941 vp);
942
943 return (error);
944 }
945
946 void
947 mac_vnode_relabel(struct ucred *cred, struct vnode *vp,
948 struct label *newlabel)
949 {
950
951 MAC_POLICY_PERFORM(vnode_relabel, cred, vp, vp->v_label, newlabel);
952 }
953
954 void
955 mac_mount_create(struct ucred *cred, struct mount *mp)
956 {
957
958 MAC_POLICY_PERFORM(mount_create, cred, mp, mp->mnt_label);
959 }
960
961 MAC_CHECK_PROBE_DEFINE2(mount_check_stat, "struct ucred *",
962 "struct mount *");
963
964 int
965 mac_mount_check_stat(struct ucred *cred, struct mount *mount)
966 {
967 int error;
968
969 MAC_POLICY_CHECK_NOSLEEP(mount_check_stat, cred, mount, mount->mnt_label);
970 MAC_CHECK_PROBE2(mount_check_stat, error, cred, mount);
971
972 return (error);
973 }
974
975 void
976 mac_devfs_create_device(struct ucred *cred, struct mount *mp,
977 struct cdev *dev, struct devfs_dirent *de)
978 {
979
980 MAC_POLICY_PERFORM_NOSLEEP(devfs_create_device, cred, mp, dev, de,
981 de->de_label);
982 }
983
984 void
985 mac_devfs_create_symlink(struct ucred *cred, struct mount *mp,
986 struct devfs_dirent *dd, struct devfs_dirent *de)
987 {
988
989 MAC_POLICY_PERFORM_NOSLEEP(devfs_create_symlink, cred, mp, dd,
990 dd->de_label, de, de->de_label);
991 }
992
993 void
994 mac_devfs_create_directory(struct mount *mp, char *dirname, int dirnamelen,
995 struct devfs_dirent *de)
996 {
997
998 MAC_POLICY_PERFORM_NOSLEEP(devfs_create_directory, mp, dirname,
999 dirnamelen, de, de->de_label);
1000 }
1001
1002 /*
1003 * Implementation of VOP_SETLABEL() that relies on extended attributes to
1004 * store label data. Can be referenced by filesystems supporting extended
1005 * attributes.
1006 */
1007 int
1008 vop_stdsetlabel_ea(struct vop_setlabel_args *ap)
1009 {
1010 struct vnode *vp = ap->a_vp;
1011 struct label *intlabel = ap->a_label;
1012 int error;
1013
1014 ASSERT_VOP_LOCKED(vp, "vop_stdsetlabel_ea");
1015
1016 if ((vp->v_mount->mnt_flag & MNT_MULTILABEL) == 0)
1017 return (EOPNOTSUPP);
1018
1019 error = mac_vnode_setlabel_extattr(ap->a_cred, vp, intlabel);
1020 if (error)
1021 return (error);
1022
1023 mac_vnode_relabel(ap->a_cred, vp, intlabel);
1024
1025 return (0);
1026 }
1027
1028 int
1029 vn_setlabel(struct vnode *vp, struct label *intlabel, struct ucred *cred)
1030 {
1031 int error;
1032
1033 if (vp->v_mount == NULL) {
1034 /* printf("vn_setlabel: null v_mount\n"); */
1035 if (vp->v_type != VNON)
1036 printf("vn_setlabel: null v_mount with non-VNON\n");
1037 return (EBADF);
1038 }
1039
1040 if ((vp->v_mount->mnt_flag & MNT_MULTILABEL) == 0)
1041 return (EOPNOTSUPP);
1042
1043 /*
1044 * Multi-phase commit. First check the policies to confirm the
1045 * change is OK. Then commit via the filesystem. Finally, update
1046 * the actual vnode label.
1047 *
1048 * Question: maybe the filesystem should update the vnode at the end
1049 * as part of VOP_SETLABEL()?
1050 */
1051 error = mac_vnode_check_relabel(cred, vp, intlabel);
1052 if (error)
1053 return (error);
1054
1055 /*
1056 * VADMIN provides the opportunity for the filesystem to make
1057 * decisions about who is and is not able to modify labels and
1058 * protections on files. This might not be right. We can't assume
1059 * VOP_SETLABEL() will do it, because we might implement that as part
1060 * of vop_stdsetlabel_ea().
1061 */
1062 error = VOP_ACCESS(vp, VADMIN, cred, curthread);
1063 if (error)
1064 return (error);
1065
1066 error = VOP_SETLABEL(vp, intlabel, cred, curthread);
1067 if (error)
1068 return (error);
1069
1070 return (0);
1071 }
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