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("$FreeBSD$");
47
48 #include "opt_mac.h"
49
50 #include <sys/param.h>
51 #include <sys/condvar.h>
52 #include <sys/extattr.h>
53 #include <sys/imgact.h>
54 #include <sys/kernel.h>
55 #include <sys/lock.h>
56 #include <sys/malloc.h>
57 #include <sys/mutex.h>
58 #include <sys/proc.h>
59 #include <sys/sbuf.h>
60 #include <sys/systm.h>
61 #include <sys/vnode.h>
62 #include <sys/mount.h>
63 #include <sys/file.h>
64 #include <sys/namei.h>
65 #include <sys/sdt.h>
66 #include <sys/sysctl.h>
67
68 #include <vm/vm.h>
69 #include <vm/pmap.h>
70 #include <vm/vm_map.h>
71 #include <vm/vm_object.h>
72
73 #include <fs/devfs/devfs.h>
74
75 #include <security/mac/mac_framework.h>
76 #include <security/mac/mac_internal.h>
77 #include <security/mac/mac_policy.h>
78
79 /*
80 * Warn about EA transactions only the first time they happen. No locking on
81 * this variable.
82 */
83 static int ea_warn_once = 0;
84
85 static int mac_vnode_setlabel_extattr(struct ucred *cred,
86 struct vnode *vp, struct label *intlabel);
87
88 static struct label *
89 mac_devfs_label_alloc(void)
90 {
91 struct label *label;
92
93 label = mac_labelzone_alloc(M_WAITOK);
94 MAC_POLICY_PERFORM(devfs_init_label, label);
95 return (label);
96 }
97
98 void
99 mac_devfs_init(struct devfs_dirent *de)
100 {
101
102 if (mac_labeled & MPC_OBJECT_DEVFS)
103 de->de_label = mac_devfs_label_alloc();
104 else
105 de->de_label = NULL;
106 }
107
108 static struct label *
109 mac_mount_label_alloc(void)
110 {
111 struct label *label;
112
113 label = mac_labelzone_alloc(M_WAITOK);
114 MAC_POLICY_PERFORM(mount_init_label, label);
115 return (label);
116 }
117
118 void
119 mac_mount_init(struct mount *mp)
120 {
121
122 if (mac_labeled & MPC_OBJECT_MOUNT)
123 mp->mnt_label = mac_mount_label_alloc();
124 else
125 mp->mnt_label = NULL;
126 }
127
128 struct label *
129 mac_vnode_label_alloc(void)
130 {
131 struct label *label;
132
133 label = mac_labelzone_alloc(M_WAITOK);
134 MAC_POLICY_PERFORM(vnode_init_label, label);
135 return (label);
136 }
137
138 void
139 mac_vnode_init(struct vnode *vp)
140 {
141
142 if (mac_labeled & MPC_OBJECT_VNODE)
143 vp->v_label = mac_vnode_label_alloc();
144 else
145 vp->v_label = NULL;
146 }
147
148 static void
149 mac_devfs_label_free(struct label *label)
150 {
151
152 MAC_POLICY_PERFORM_NOSLEEP(devfs_destroy_label, label);
153 mac_labelzone_free(label);
154 }
155
156 void
157 mac_devfs_destroy(struct devfs_dirent *de)
158 {
159
160 if (de->de_label != NULL) {
161 mac_devfs_label_free(de->de_label);
162 de->de_label = NULL;
163 }
164 }
165
166 static void
167 mac_mount_label_free(struct label *label)
168 {
169
170 MAC_POLICY_PERFORM_NOSLEEP(mount_destroy_label, label);
171 mac_labelzone_free(label);
172 }
173
174 void
175 mac_mount_destroy(struct mount *mp)
176 {
177
178 if (mp->mnt_label != NULL) {
179 mac_mount_label_free(mp->mnt_label);
180 mp->mnt_label = NULL;
181 }
182 }
183
184 void
185 mac_vnode_label_free(struct label *label)
186 {
187
188 MAC_POLICY_PERFORM_NOSLEEP(vnode_destroy_label, label);
189 mac_labelzone_free(label);
190 }
191
192 void
193 mac_vnode_destroy(struct vnode *vp)
194 {
195
196 if (vp->v_label != NULL) {
197 mac_vnode_label_free(vp->v_label);
198 vp->v_label = NULL;
199 }
200 }
201
202 void
203 mac_vnode_copy_label(struct label *src, struct label *dest)
204 {
205
206 MAC_POLICY_PERFORM_NOSLEEP(vnode_copy_label, src, dest);
207 }
208
209 int
210 mac_vnode_externalize_label(struct label *label, char *elements,
211 char *outbuf, size_t outbuflen)
212 {
213 int error;
214
215 MAC_POLICY_EXTERNALIZE(vnode, label, elements, outbuf, outbuflen);
216
217 return (error);
218 }
219
220 int
221 mac_vnode_internalize_label(struct label *label, char *string)
222 {
223 int error;
224
225 MAC_POLICY_INTERNALIZE(vnode, label, string);
226
227 return (error);
228 }
229
230 void
231 mac_devfs_update(struct mount *mp, struct devfs_dirent *de, struct vnode *vp)
232 {
233
234 MAC_POLICY_PERFORM_NOSLEEP(devfs_update, mp, de, de->de_label, vp,
235 vp->v_label);
236 }
237
238 void
239 mac_devfs_vnode_associate(struct mount *mp, struct devfs_dirent *de,
240 struct vnode *vp)
241 {
242
243 MAC_POLICY_PERFORM_NOSLEEP(devfs_vnode_associate, mp, mp->mnt_label,
244 de, de->de_label, vp, vp->v_label);
245 }
246
247 int
248 mac_vnode_associate_extattr(struct mount *mp, struct vnode *vp)
249 {
250 int error;
251
252 ASSERT_VOP_LOCKED(vp, "mac_vnode_associate_extattr");
253
254 MAC_POLICY_CHECK(vnode_associate_extattr, mp, mp->mnt_label, vp,
255 vp->v_label);
256
257 return (error);
258 }
259
260 void
261 mac_vnode_associate_singlelabel(struct mount *mp, struct vnode *vp)
262 {
263
264 MAC_POLICY_PERFORM_NOSLEEP(vnode_associate_singlelabel, mp,
265 mp->mnt_label, vp, vp->v_label);
266 }
267
268 /*
269 * Functions implementing extended-attribute backed labels for file systems
270 * that support it.
271 *
272 * Where possible, we use EA transactions to make writes to multiple
273 * attributes across difference policies mutually atomic. We allow work to
274 * continue on file systems not supporting EA transactions, but generate a
275 * printf warning.
276 */
277 int
278 mac_vnode_create_extattr(struct ucred *cred, struct mount *mp,
279 struct vnode *dvp, struct vnode *vp, struct componentname *cnp)
280 {
281 int error;
282
283 ASSERT_VOP_LOCKED(dvp, "mac_vnode_create_extattr");
284 ASSERT_VOP_LOCKED(vp, "mac_vnode_create_extattr");
285
286 error = VOP_OPENEXTATTR(vp, cred, curthread);
287 if (error == EOPNOTSUPP) {
288 if (ea_warn_once == 0) {
289 printf("Warning: transactions not supported "
290 "in EA write.\n");
291 ea_warn_once = 1;
292 }
293 } else if (error)
294 return (error);
295
296 MAC_POLICY_CHECK(vnode_create_extattr, cred, mp, mp->mnt_label, dvp,
297 dvp->v_label, vp, vp->v_label, cnp);
298
299 if (error) {
300 VOP_CLOSEEXTATTR(vp, 0, NOCRED, curthread);
301 return (error);
302 }
303
304 error = VOP_CLOSEEXTATTR(vp, 1, NOCRED, curthread);
305 if (error == EOPNOTSUPP)
306 error = 0;
307
308 return (error);
309 }
310
311 static int
312 mac_vnode_setlabel_extattr(struct ucred *cred, struct vnode *vp,
313 struct label *intlabel)
314 {
315 int error;
316
317 ASSERT_VOP_LOCKED(vp, "mac_vnode_setlabel_extattr");
318
319 error = VOP_OPENEXTATTR(vp, cred, curthread);
320 if (error == EOPNOTSUPP) {
321 if (ea_warn_once == 0) {
322 printf("Warning: transactions not supported "
323 "in EA write.\n");
324 ea_warn_once = 1;
325 }
326 } else if (error)
327 return (error);
328
329 MAC_POLICY_CHECK(vnode_setlabel_extattr, cred, vp, vp->v_label,
330 intlabel);
331
332 if (error) {
333 VOP_CLOSEEXTATTR(vp, 0, NOCRED, curthread);
334 return (error);
335 }
336
337 error = VOP_CLOSEEXTATTR(vp, 1, NOCRED, curthread);
338 if (error == EOPNOTSUPP)
339 error = 0;
340
341 return (error);
342 }
343
344 void
345 mac_vnode_execve_transition(struct ucred *old, struct ucred *new,
346 struct vnode *vp, struct label *interpvplabel, struct image_params *imgp)
347 {
348
349 ASSERT_VOP_LOCKED(vp, "mac_vnode_execve_transition");
350
351 MAC_POLICY_PERFORM(vnode_execve_transition, old, new, vp,
352 vp->v_label, interpvplabel, imgp, imgp->execlabel);
353 }
354
355 int
356 mac_vnode_execve_will_transition(struct ucred *old, struct vnode *vp,
357 struct label *interpvplabel, struct image_params *imgp)
358 {
359 int result;
360
361 ASSERT_VOP_LOCKED(vp, "mac_vnode_execve_will_transition");
362
363 result = 0;
364 /* No sleeping since the process lock will be held by the caller. */
365 MAC_POLICY_BOOLEAN_NOSLEEP(vnode_execve_will_transition, ||, old, vp,
366 vp->v_label, interpvplabel, imgp, imgp->execlabel);
367
368 return (result);
369 }
370
371 MAC_CHECK_PROBE_DEFINE3(vnode_check_access, "struct ucred *",
372 "struct vnode *", "accmode_t");
373
374 int
375 mac_vnode_check_access_impl(struct ucred *cred, struct vnode *vp, accmode_t accmode)
376 {
377 int error;
378
379 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_access");
380
381 MAC_POLICY_CHECK(vnode_check_access, cred, vp, vp->v_label, accmode);
382 MAC_CHECK_PROBE3(vnode_check_access, error, cred, vp, accmode);
383
384 return (error);
385 }
386
387 MAC_CHECK_PROBE_DEFINE2(vnode_check_chdir, "struct ucred *",
388 "struct vnode *");
389
390 int
391 mac_vnode_check_chdir(struct ucred *cred, struct vnode *dvp)
392 {
393 int error;
394
395 ASSERT_VOP_LOCKED(dvp, "mac_vnode_check_chdir");
396
397 MAC_POLICY_CHECK(vnode_check_chdir, cred, dvp, dvp->v_label);
398 MAC_CHECK_PROBE2(vnode_check_chdir, error, cred, dvp);
399
400 return (error);
401 }
402
403 MAC_CHECK_PROBE_DEFINE2(vnode_check_chroot, "struct ucred *",
404 "struct vnode *");
405
406 int
407 mac_vnode_check_chroot(struct ucred *cred, struct vnode *dvp)
408 {
409 int error;
410
411 ASSERT_VOP_LOCKED(dvp, "mac_vnode_check_chroot");
412
413 MAC_POLICY_CHECK(vnode_check_chroot, cred, dvp, dvp->v_label);
414 MAC_CHECK_PROBE2(vnode_check_chroot, error, cred, dvp);
415
416 return (error);
417 }
418
419 MAC_CHECK_PROBE_DEFINE4(vnode_check_create, "struct ucred *",
420 "struct vnode *", "struct componentname *", "struct vattr *");
421
422 int
423 mac_vnode_check_create(struct ucred *cred, struct vnode *dvp,
424 struct componentname *cnp, struct vattr *vap)
425 {
426 int error;
427
428 ASSERT_VOP_LOCKED(dvp, "mac_vnode_check_create");
429
430 MAC_POLICY_CHECK(vnode_check_create, cred, dvp, dvp->v_label, cnp,
431 vap);
432 MAC_CHECK_PROBE4(vnode_check_create, error, cred, dvp, cnp, vap);
433
434 return (error);
435 }
436
437 MAC_CHECK_PROBE_DEFINE3(vnode_check_deleteacl, "struct ucred *",
438 "struct vnode *", "acl_type_t");
439
440 int
441 mac_vnode_check_deleteacl(struct ucred *cred, struct vnode *vp,
442 acl_type_t type)
443 {
444 int error;
445
446 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_deleteacl");
447
448 MAC_POLICY_CHECK(vnode_check_deleteacl, cred, vp, vp->v_label, type);
449 MAC_CHECK_PROBE3(vnode_check_deleteacl, error, cred, vp, type);
450
451 return (error);
452 }
453
454 MAC_CHECK_PROBE_DEFINE4(vnode_check_deleteextattr, "struct ucred *",
455 "struct vnode *", "int", "const char *");
456
457 int
458 mac_vnode_check_deleteextattr(struct ucred *cred, struct vnode *vp,
459 int attrnamespace, const char *name)
460 {
461 int error;
462
463 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_deleteextattr");
464
465 MAC_POLICY_CHECK(vnode_check_deleteextattr, cred, vp, vp->v_label,
466 attrnamespace, name);
467 MAC_CHECK_PROBE4(vnode_check_deleteextattr, error, cred, vp,
468 attrnamespace, name);
469
470 return (error);
471 }
472
473 MAC_CHECK_PROBE_DEFINE3(vnode_check_exec, "struct ucred *", "struct vnode *",
474 "struct image_params *");
475
476 int
477 mac_vnode_check_exec(struct ucred *cred, struct vnode *vp,
478 struct image_params *imgp)
479 {
480 int error;
481
482 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_exec");
483
484 MAC_POLICY_CHECK(vnode_check_exec, cred, vp, vp->v_label, imgp,
485 imgp->execlabel);
486 MAC_CHECK_PROBE3(vnode_check_exec, error, cred, vp, imgp);
487
488 return (error);
489 }
490
491 MAC_CHECK_PROBE_DEFINE3(vnode_check_getacl, "struct ucred *",
492 "struct vnode *", "acl_type_t");
493
494 int
495 mac_vnode_check_getacl(struct ucred *cred, struct vnode *vp, acl_type_t type)
496 {
497 int error;
498
499 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_getacl");
500
501 MAC_POLICY_CHECK(vnode_check_getacl, cred, vp, vp->v_label, type);
502 MAC_CHECK_PROBE3(vnode_check_getacl, error, cred, vp, type);
503
504 return (error);
505 }
506
507 MAC_CHECK_PROBE_DEFINE4(vnode_check_getextattr, "struct ucred *",
508 "struct vnode *", "int", "const char *");
509
510 int
511 mac_vnode_check_getextattr(struct ucred *cred, struct vnode *vp,
512 int attrnamespace, const char *name)
513 {
514 int error;
515
516 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_getextattr");
517
518 MAC_POLICY_CHECK(vnode_check_getextattr, cred, vp, vp->v_label,
519 attrnamespace, name);
520 MAC_CHECK_PROBE4(vnode_check_getextattr, error, cred, vp,
521 attrnamespace, name);
522
523 return (error);
524 }
525
526 MAC_CHECK_PROBE_DEFINE4(vnode_check_link, "struct ucred *", "struct vnode *",
527 "struct vnode *", "struct componentname *");
528
529 int
530 mac_vnode_check_link(struct ucred *cred, struct vnode *dvp,
531 struct vnode *vp, struct componentname *cnp)
532 {
533 int error;
534
535 ASSERT_VOP_LOCKED(dvp, "mac_vnode_check_link");
536 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_link");
537
538 MAC_POLICY_CHECK(vnode_check_link, cred, dvp, dvp->v_label, vp,
539 vp->v_label, cnp);
540 MAC_CHECK_PROBE4(vnode_check_link, error, cred, dvp, vp, cnp);
541
542 return (error);
543 }
544
545 MAC_CHECK_PROBE_DEFINE3(vnode_check_listextattr, "struct ucred *",
546 "struct vnode *", "int");
547
548 int
549 mac_vnode_check_listextattr(struct ucred *cred, struct vnode *vp,
550 int attrnamespace)
551 {
552 int error;
553
554 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_listextattr");
555
556 MAC_POLICY_CHECK(vnode_check_listextattr, cred, vp, vp->v_label,
557 attrnamespace);
558 MAC_CHECK_PROBE3(vnode_check_listextattr, error, cred, vp,
559 attrnamespace);
560
561 return (error);
562 }
563
564 MAC_CHECK_PROBE_DEFINE3(vnode_check_lookup, "struct ucred *",
565 "struct vnode *", "struct componentname *");
566
567 int
568 mac_vnode_check_lookup_impl(struct ucred *cred, struct vnode *dvp,
569 struct componentname *cnp)
570 {
571 int error;
572
573 ASSERT_VOP_LOCKED(dvp, "mac_vnode_check_lookup");
574
575 if ((cnp->cn_flags & NOMACCHECK) != 0)
576 return (0);
577 MAC_POLICY_CHECK(vnode_check_lookup, cred, dvp, dvp->v_label, cnp);
578 MAC_CHECK_PROBE3(vnode_check_lookup, error, cred, dvp, cnp);
579
580 return (error);
581 }
582
583 MAC_CHECK_PROBE_DEFINE4(vnode_check_mmap, "struct ucred *", "struct vnode *",
584 "int", "int");
585
586 int
587 mac_vnode_check_mmap_impl(struct ucred *cred, struct vnode *vp, int prot,
588 int flags)
589 {
590 int error;
591
592 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_mmap");
593
594 MAC_POLICY_CHECK(vnode_check_mmap, cred, vp, vp->v_label, prot, flags);
595 MAC_CHECK_PROBE4(vnode_check_mmap, error, cred, vp, prot, flags);
596
597 return (error);
598 }
599
600 void
601 mac_vnode_check_mmap_downgrade(struct ucred *cred, struct vnode *vp,
602 int *prot)
603 {
604 int result = *prot;
605
606 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_mmap_downgrade");
607
608 MAC_POLICY_PERFORM(vnode_check_mmap_downgrade, cred, vp, vp->v_label,
609 &result);
610
611 *prot = result;
612 }
613
614 MAC_CHECK_PROBE_DEFINE3(vnode_check_mprotect, "struct ucred *",
615 "struct vnode *", "int");
616
617 int
618 mac_vnode_check_mprotect(struct ucred *cred, struct vnode *vp, int prot)
619 {
620 int error;
621
622 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_mprotect");
623
624 MAC_POLICY_CHECK(vnode_check_mprotect, cred, vp, vp->v_label, prot);
625 MAC_CHECK_PROBE3(vnode_check_mprotect, error, cred, vp, prot);
626
627 return (error);
628 }
629
630 MAC_CHECK_PROBE_DEFINE3(vnode_check_open, "struct ucred *", "struct vnode *",
631 "accmode_t");
632
633 int
634 mac_vnode_check_open_impl(struct ucred *cred, struct vnode *vp, accmode_t accmode)
635 {
636 int error;
637
638 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_open");
639
640 MAC_POLICY_CHECK(vnode_check_open, cred, vp, vp->v_label, accmode);
641 MAC_CHECK_PROBE3(vnode_check_open, error, cred, vp, accmode);
642
643 return (error);
644 }
645
646 MAC_CHECK_PROBE_DEFINE3(vnode_check_poll, "struct ucred *", "struct ucred *",
647 "struct vnode *");
648
649 int
650 mac_vnode_check_poll(struct ucred *active_cred, struct ucred *file_cred,
651 struct vnode *vp)
652 {
653 int error;
654
655 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_poll");
656
657 MAC_POLICY_CHECK(vnode_check_poll, active_cred, file_cred, vp,
658 vp->v_label);
659 MAC_CHECK_PROBE3(vnode_check_poll, error, active_cred, file_cred,
660 vp);
661
662 return (error);
663 }
664
665 MAC_CHECK_PROBE_DEFINE3(vnode_check_read, "struct ucred *", "struct ucred *",
666 "struct vnode *");
667
668 int
669 mac_vnode_check_read_impl(struct ucred *active_cred, struct ucred *file_cred,
670 struct vnode *vp)
671 {
672 int error;
673
674 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_read");
675
676 MAC_POLICY_CHECK(vnode_check_read, active_cred, file_cred, vp,
677 vp->v_label);
678 MAC_CHECK_PROBE3(vnode_check_read, error, active_cred, file_cred,
679 vp);
680
681 return (error);
682 }
683
684 MAC_CHECK_PROBE_DEFINE2(vnode_check_readdir, "struct ucred *",
685 "struct vnode *");
686
687 int
688 mac_vnode_check_readdir(struct ucred *cred, struct vnode *dvp)
689 {
690 int error;
691
692 ASSERT_VOP_LOCKED(dvp, "mac_vnode_check_readdir");
693
694 MAC_POLICY_CHECK(vnode_check_readdir, cred, dvp, dvp->v_label);
695 MAC_CHECK_PROBE2(vnode_check_readdir, error, cred, dvp);
696
697 return (error);
698 }
699
700 MAC_CHECK_PROBE_DEFINE2(vnode_check_readlink, "struct ucred *",
701 "struct vnode *");
702
703 int
704 mac_vnode_check_readlink_impl(struct ucred *cred, struct vnode *vp)
705 {
706 int error;
707
708 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_readlink");
709
710 MAC_POLICY_CHECK(vnode_check_readlink, cred, vp, vp->v_label);
711 MAC_CHECK_PROBE2(vnode_check_readlink, error, cred, vp);
712
713 return (error);
714 }
715
716 MAC_CHECK_PROBE_DEFINE3(vnode_check_relabel, "struct ucred *",
717 "struct vnode *", "struct label *");
718
719 static int
720 mac_vnode_check_relabel(struct ucred *cred, struct vnode *vp,
721 struct label *newlabel)
722 {
723 int error;
724
725 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_relabel");
726
727 MAC_POLICY_CHECK(vnode_check_relabel, cred, vp, vp->v_label, newlabel);
728 MAC_CHECK_PROBE3(vnode_check_relabel, error, cred, vp, newlabel);
729
730 return (error);
731 }
732
733 MAC_CHECK_PROBE_DEFINE4(vnode_check_rename_from, "struct ucred *",
734 "struct vnode *", "struct vnode *", "struct componentname *");
735
736 int
737 mac_vnode_check_rename_from(struct ucred *cred, struct vnode *dvp,
738 struct vnode *vp, struct componentname *cnp)
739 {
740 int error;
741
742 ASSERT_VOP_LOCKED(dvp, "mac_vnode_check_rename_from");
743 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_rename_from");
744
745 MAC_POLICY_CHECK(vnode_check_rename_from, cred, dvp, dvp->v_label, vp,
746 vp->v_label, cnp);
747 MAC_CHECK_PROBE4(vnode_check_rename_from, error, cred, dvp, vp, cnp);
748
749 return (error);
750 }
751
752 MAC_CHECK_PROBE_DEFINE4(vnode_check_rename_to, "struct ucred *",
753 "struct vnode *", "struct vnode *", "struct componentname *");
754
755 int
756 mac_vnode_check_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_vnode_check_rename_to");
762 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_rename_to");
763
764 MAC_POLICY_CHECK(vnode_check_rename_to, cred, dvp, dvp->v_label, vp,
765 vp != NULL ? vp->v_label : NULL, samedir, cnp);
766 MAC_CHECK_PROBE4(vnode_check_rename_to, error, cred, dvp, vp, cnp);
767 return (error);
768 }
769
770 MAC_CHECK_PROBE_DEFINE2(vnode_check_revoke, "struct ucred *",
771 "struct vnode *");
772
773 int
774 mac_vnode_check_revoke(struct ucred *cred, struct vnode *vp)
775 {
776 int error;
777
778 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_revoke");
779
780 MAC_POLICY_CHECK(vnode_check_revoke, cred, vp, vp->v_label);
781 MAC_CHECK_PROBE2(vnode_check_revoke, error, cred, vp);
782
783 return (error);
784 }
785
786 MAC_CHECK_PROBE_DEFINE4(vnode_check_setacl, "struct ucred *",
787 "struct vnode *", "acl_type_t", "struct acl *");
788
789 int
790 mac_vnode_check_setacl(struct ucred *cred, struct vnode *vp, acl_type_t type,
791 struct acl *acl)
792 {
793 int error;
794
795 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_setacl");
796
797 MAC_POLICY_CHECK(vnode_check_setacl, cred, vp, vp->v_label, type, acl);
798 MAC_CHECK_PROBE4(vnode_check_setacl, error, cred, vp, type, acl);
799
800 return (error);
801 }
802
803 MAC_CHECK_PROBE_DEFINE4(vnode_check_setextattr, "struct ucred *",
804 "struct vnode *", "int", "const char *");
805
806 int
807 mac_vnode_check_setextattr(struct ucred *cred, struct vnode *vp,
808 int attrnamespace, const char *name)
809 {
810 int error;
811
812 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_setextattr");
813
814 MAC_POLICY_CHECK(vnode_check_setextattr, cred, vp, vp->v_label,
815 attrnamespace, name);
816 MAC_CHECK_PROBE4(vnode_check_setextattr, error, cred, vp,
817 attrnamespace, name);
818
819 return (error);
820 }
821
822 MAC_CHECK_PROBE_DEFINE3(vnode_check_setflags, "struct ucred *",
823 "struct vnode *", "u_long");
824
825 int
826 mac_vnode_check_setflags(struct ucred *cred, struct vnode *vp, u_long flags)
827 {
828 int error;
829
830 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_setflags");
831
832 MAC_POLICY_CHECK(vnode_check_setflags, cred, vp, vp->v_label, flags);
833 MAC_CHECK_PROBE3(vnode_check_setflags, error, cred, vp, flags);
834
835 return (error);
836 }
837
838 MAC_CHECK_PROBE_DEFINE3(vnode_check_setmode, "struct ucred *",
839 "struct vnode *", "mode_t");
840
841 int
842 mac_vnode_check_setmode(struct ucred *cred, struct vnode *vp, mode_t mode)
843 {
844 int error;
845
846 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_setmode");
847
848 MAC_POLICY_CHECK(vnode_check_setmode, cred, vp, vp->v_label, mode);
849 MAC_CHECK_PROBE3(vnode_check_setmode, error, cred, vp, mode);
850
851 return (error);
852 }
853
854 MAC_CHECK_PROBE_DEFINE4(vnode_check_setowner, "struct ucred *",
855 "struct vnode *", "uid_t", "gid_t");
856
857 int
858 mac_vnode_check_setowner(struct ucred *cred, struct vnode *vp, uid_t uid,
859 gid_t gid)
860 {
861 int error;
862
863 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_setowner");
864
865 MAC_POLICY_CHECK(vnode_check_setowner, cred, vp, vp->v_label, uid, gid);
866 MAC_CHECK_PROBE4(vnode_check_setowner, error, cred, vp, uid, gid);
867
868 return (error);
869 }
870
871 MAC_CHECK_PROBE_DEFINE4(vnode_check_setutimes, "struct ucred *",
872 "struct vnode *", "struct timespec *", "struct timespec *");
873
874 int
875 mac_vnode_check_setutimes(struct ucred *cred, struct vnode *vp,
876 struct timespec atime, struct timespec mtime)
877 {
878 int error;
879
880 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_setutimes");
881
882 MAC_POLICY_CHECK(vnode_check_setutimes, cred, vp, vp->v_label, atime,
883 mtime);
884 MAC_CHECK_PROBE4(vnode_check_setutimes, error, cred, vp, &atime,
885 &mtime);
886
887 return (error);
888 }
889
890 MAC_CHECK_PROBE_DEFINE3(vnode_check_stat, "struct ucred *", "struct ucred *",
891 "struct vnode *");
892
893 int
894 mac_vnode_check_stat_impl(struct ucred *active_cred, struct ucred *file_cred,
895 struct vnode *vp)
896 {
897 int error;
898
899 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_stat");
900
901 MAC_POLICY_CHECK(vnode_check_stat, active_cred, file_cred, vp,
902 vp->v_label);
903 MAC_CHECK_PROBE3(vnode_check_stat, error, active_cred, file_cred,
904 vp);
905
906 return (error);
907 }
908
909 MAC_CHECK_PROBE_DEFINE4(vnode_check_unlink, "struct ucred *",
910 "struct vnode *", "struct vnode *", "struct componentname *");
911
912 int
913 mac_vnode_check_unlink(struct ucred *cred, struct vnode *dvp,
914 struct vnode *vp, struct componentname *cnp)
915 {
916 int error;
917
918 ASSERT_VOP_LOCKED(dvp, "mac_vnode_check_unlink");
919 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_unlink");
920
921 MAC_POLICY_CHECK(vnode_check_unlink, cred, dvp, dvp->v_label, vp,
922 vp->v_label, cnp);
923 MAC_CHECK_PROBE4(vnode_check_unlink, error, cred, dvp, vp, cnp);
924
925 return (error);
926 }
927
928 MAC_CHECK_PROBE_DEFINE3(vnode_check_write, "struct ucred *",
929 "struct ucred *", "struct vnode *");
930
931 int
932 mac_vnode_check_write_impl(struct ucred *active_cred, struct ucred *file_cred,
933 struct vnode *vp)
934 {
935 int error;
936
937 ASSERT_VOP_LOCKED(vp, "mac_vnode_check_write");
938
939 MAC_POLICY_CHECK(vnode_check_write, active_cred, file_cred, vp,
940 vp->v_label);
941 MAC_CHECK_PROBE3(vnode_check_write, error, active_cred, file_cred,
942 vp);
943
944 return (error);
945 }
946
947 void
948 mac_vnode_relabel(struct ucred *cred, struct vnode *vp,
949 struct label *newlabel)
950 {
951
952 MAC_POLICY_PERFORM(vnode_relabel, cred, vp, vp->v_label, newlabel);
953 }
954
955 void
956 mac_mount_create(struct ucred *cred, struct mount *mp)
957 {
958
959 MAC_POLICY_PERFORM(mount_create, cred, mp, mp->mnt_label);
960 }
961
962 MAC_CHECK_PROBE_DEFINE2(mount_check_stat, "struct ucred *",
963 "struct mount *");
964
965 int
966 mac_mount_check_stat(struct ucred *cred, struct mount *mount)
967 {
968 int error;
969
970 MAC_POLICY_CHECK_NOSLEEP(mount_check_stat, cred, mount, mount->mnt_label);
971 MAC_CHECK_PROBE2(mount_check_stat, error, cred, mount);
972
973 return (error);
974 }
975
976 void
977 mac_devfs_create_device(struct ucred *cred, struct mount *mp,
978 struct cdev *dev, struct devfs_dirent *de)
979 {
980
981 MAC_POLICY_PERFORM_NOSLEEP(devfs_create_device, cred, mp, dev, de,
982 de->de_label);
983 }
984
985 void
986 mac_devfs_create_symlink(struct ucred *cred, struct mount *mp,
987 struct devfs_dirent *dd, struct devfs_dirent *de)
988 {
989
990 MAC_POLICY_PERFORM_NOSLEEP(devfs_create_symlink, cred, mp, dd,
991 dd->de_label, de, de->de_label);
992 }
993
994 void
995 mac_devfs_create_directory(struct mount *mp, char *dirname, int dirnamelen,
996 struct devfs_dirent *de)
997 {
998
999 MAC_POLICY_PERFORM_NOSLEEP(devfs_create_directory, mp, dirname,
1000 dirnamelen, de, de->de_label);
1001 }
1002
1003 /*
1004 * Implementation of VOP_SETLABEL() that relies on extended attributes to
1005 * store label data. Can be referenced by filesystems supporting extended
1006 * attributes.
1007 */
1008 int
1009 vop_stdsetlabel_ea(struct vop_setlabel_args *ap)
1010 {
1011 struct vnode *vp = ap->a_vp;
1012 struct label *intlabel = ap->a_label;
1013 int error;
1014
1015 ASSERT_VOP_LOCKED(vp, "vop_stdsetlabel_ea");
1016
1017 if ((vp->v_mount->mnt_flag & MNT_MULTILABEL) == 0)
1018 return (EOPNOTSUPP);
1019
1020 error = mac_vnode_setlabel_extattr(ap->a_cred, vp, intlabel);
1021 if (error)
1022 return (error);
1023
1024 mac_vnode_relabel(ap->a_cred, vp, intlabel);
1025
1026 return (0);
1027 }
1028
1029 int
1030 vn_setlabel(struct vnode *vp, struct label *intlabel, struct ucred *cred)
1031 {
1032 int error;
1033
1034 if (vp->v_mount == NULL) {
1035 /* printf("vn_setlabel: null v_mount\n"); */
1036 if (vp->v_type != VNON)
1037 printf("vn_setlabel: null v_mount with non-VNON\n");
1038 return (EBADF);
1039 }
1040
1041 if ((vp->v_mount->mnt_flag & MNT_MULTILABEL) == 0)
1042 return (EOPNOTSUPP);
1043
1044 /*
1045 * Multi-phase commit. First check the policies to confirm the
1046 * change is OK. Then commit via the filesystem. Finally, update
1047 * the actual vnode label.
1048 *
1049 * Question: maybe the filesystem should update the vnode at the end
1050 * as part of VOP_SETLABEL()?
1051 */
1052 error = mac_vnode_check_relabel(cred, vp, intlabel);
1053 if (error)
1054 return (error);
1055
1056 /*
1057 * VADMIN provides the opportunity for the filesystem to make
1058 * decisions about who is and is not able to modify labels and
1059 * protections on files. This might not be right. We can't assume
1060 * VOP_SETLABEL() will do it, because we might implement that as part
1061 * of vop_stdsetlabel_ea().
1062 */
1063 error = VOP_ACCESS(vp, VADMIN, cred, curthread);
1064 if (error)
1065 return (error);
1066
1067 error = VOP_SETLABEL(vp, intlabel, cred, curthread);
1068 if (error)
1069 return (error);
1070
1071 return (0);
1072 }
1073
1074 #ifdef DEBUG_VFS_LOCKS
1075 void
1076 mac_vnode_assert_locked(struct vnode *vp, const char *func)
1077 {
1078
1079 ASSERT_VOP_LOCKED(vp, func);
1080 }
1081 #endif
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