1 /*-
2 * Copyright (c) 1999-2002, 2007-2009 Robert N. M. Watson
3 * Copyright (c) 2001-2005 Networks Associates Technology, Inc.
4 * Copyright (c) 2006 SPARTA, Inc.
5 * All rights reserved.
6 *
7 * This software was developed by Robert Watson for the TrustedBSD Project.
8 *
9 * This software was developed for the FreeBSD Project in part by NAI Labs,
10 * the Security Research Division of Network Associates, Inc. under
11 * DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA
12 * CHATS research program.
13 *
14 * This software was enhanced by SPARTA ISSO under SPAWAR contract
15 * N66001-04-C-6019 ("SEFOS").
16 *
17 * Redistribution and use in source and binary forms, with or without
18 * modification, are permitted provided that the following conditions
19 * are met:
20 * 1. Redistributions of source code must retain the above copyright
21 * notice, this list of conditions and the following disclaimer.
22 * 2. Redistributions in binary form must reproduce the above copyright
23 * notice, this list of conditions and the following disclaimer in the
24 * documentation and/or other materials provided with the distribution.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 *
38 * $FreeBSD$
39 */
40
41 /*
42 * Developed by the TrustedBSD Project.
43 *
44 * Low-watermark floating label mandatory integrity policy.
45 */
46
47 #include <sys/types.h>
48 #include <sys/param.h>
49 #include <sys/acl.h>
50 #include <sys/conf.h>
51 #include <sys/extattr.h>
52 #include <sys/kernel.h>
53 #include <sys/malloc.h>
54 #include <sys/mman.h>
55 #include <sys/mount.h>
56 #include <sys/priv.h>
57 #include <sys/proc.h>
58 #include <sys/sbuf.h>
59 #include <sys/systm.h>
60 #include <sys/sysproto.h>
61 #include <sys/sysent.h>
62 #include <sys/systm.h>
63 #include <sys/vnode.h>
64 #include <sys/file.h>
65 #include <sys/socket.h>
66 #include <sys/socketvar.h>
67 #include <sys/sx.h>
68 #include <sys/pipe.h>
69 #include <sys/sysctl.h>
70 #include <sys/syslog.h>
71
72 #include <fs/devfs/devfs.h>
73
74 #include <net/bpfdesc.h>
75 #include <net/if.h>
76 #include <net/if_types.h>
77 #include <net/if_var.h>
78
79 #include <netinet/in.h>
80 #include <netinet/in_pcb.h>
81 #include <netinet/ip_var.h>
82
83 #include <vm/vm.h>
84
85 #include <security/mac/mac_policy.h>
86 #include <security/mac/mac_framework.h>
87 #include <security/mac_lomac/mac_lomac.h>
88
89 struct mac_lomac_proc {
90 struct mac_lomac mac_lomac;
91 struct mtx mtx;
92 };
93
94 SYSCTL_DECL(_security_mac);
95
96 SYSCTL_NODE(_security_mac, OID_AUTO, lomac, CTLFLAG_RW, 0,
97 "TrustedBSD mac_lomac policy controls");
98
99 static int lomac_label_size = sizeof(struct mac_lomac);
100 SYSCTL_INT(_security_mac_lomac, OID_AUTO, label_size, CTLFLAG_RD,
101 &lomac_label_size, 0, "Size of struct mac_lomac");
102
103 static int lomac_enabled = 1;
104 SYSCTL_INT(_security_mac_lomac, OID_AUTO, enabled, CTLFLAG_RW,
105 &lomac_enabled, 0, "Enforce MAC/LOMAC policy");
106 TUNABLE_INT("security.mac.lomac.enabled", &lomac_enabled);
107
108 static int destroyed_not_inited;
109 SYSCTL_INT(_security_mac_lomac, OID_AUTO, destroyed_not_inited, CTLFLAG_RD,
110 &destroyed_not_inited, 0, "Count of labels destroyed but not inited");
111
112 static int trust_all_interfaces = 0;
113 SYSCTL_INT(_security_mac_lomac, OID_AUTO, trust_all_interfaces, CTLFLAG_RD,
114 &trust_all_interfaces, 0, "Consider all interfaces 'trusted' by MAC/LOMAC");
115 TUNABLE_INT("security.mac.lomac.trust_all_interfaces", &trust_all_interfaces);
116
117 static char trusted_interfaces[128];
118 SYSCTL_STRING(_security_mac_lomac, OID_AUTO, trusted_interfaces, CTLFLAG_RD,
119 trusted_interfaces, 0, "Interfaces considered 'trusted' by MAC/LOMAC");
120 TUNABLE_STR("security.mac.lomac.trusted_interfaces", trusted_interfaces,
121 sizeof(trusted_interfaces));
122
123 static int ptys_equal = 0;
124 SYSCTL_INT(_security_mac_lomac, OID_AUTO, ptys_equal, CTLFLAG_RW,
125 &ptys_equal, 0, "Label pty devices as lomac/equal on create");
126 TUNABLE_INT("security.mac.lomac.ptys_equal", &ptys_equal);
127
128 static int revocation_enabled = 1;
129 SYSCTL_INT(_security_mac_lomac, OID_AUTO, revocation_enabled, CTLFLAG_RW,
130 &revocation_enabled, 0, "Revoke access to objects on relabel");
131 TUNABLE_INT("security.mac.lomac.revocation_enabled", &revocation_enabled);
132
133 static int lomac_slot;
134 #define SLOT(l) ((struct mac_lomac *)mac_label_get((l), lomac_slot))
135 #define SLOT_SET(l, val) mac_label_set((l), lomac_slot, (uintptr_t)(val))
136 #define PSLOT(l) ((struct mac_lomac_proc *) \
137 mac_label_get((l), lomac_slot))
138 #define PSLOT_SET(l, val) mac_label_set((l), lomac_slot, (uintptr_t)(val))
139
140 MALLOC_DEFINE(M_LOMAC, "mac_lomac_label", "MAC/LOMAC labels");
141
142 static struct mac_lomac *
143 lomac_alloc(int flag)
144 {
145 struct mac_lomac *ml;
146
147 ml = malloc(sizeof(*ml), M_LOMAC, M_ZERO | flag);
148
149 return (ml);
150 }
151
152 static void
153 lomac_free(struct mac_lomac *ml)
154 {
155
156 if (ml != NULL)
157 free(ml, M_LOMAC);
158 else
159 atomic_add_int(&destroyed_not_inited, 1);
160 }
161
162 static int
163 lomac_atmostflags(struct mac_lomac *ml, int flags)
164 {
165
166 if ((ml->ml_flags & flags) != ml->ml_flags)
167 return (EINVAL);
168 return (0);
169 }
170
171 static int
172 lomac_dominate_element(struct mac_lomac_element *a,
173 struct mac_lomac_element *b)
174 {
175
176 switch (a->mle_type) {
177 case MAC_LOMAC_TYPE_EQUAL:
178 case MAC_LOMAC_TYPE_HIGH:
179 return (1);
180
181 case MAC_LOMAC_TYPE_LOW:
182 switch (b->mle_type) {
183 case MAC_LOMAC_TYPE_GRADE:
184 case MAC_LOMAC_TYPE_HIGH:
185 return (0);
186
187 case MAC_LOMAC_TYPE_EQUAL:
188 case MAC_LOMAC_TYPE_LOW:
189 return (1);
190
191 default:
192 panic("lomac_dominate_element: b->mle_type invalid");
193 }
194
195 case MAC_LOMAC_TYPE_GRADE:
196 switch (b->mle_type) {
197 case MAC_LOMAC_TYPE_EQUAL:
198 case MAC_LOMAC_TYPE_LOW:
199 return (1);
200
201 case MAC_LOMAC_TYPE_HIGH:
202 return (0);
203
204 case MAC_LOMAC_TYPE_GRADE:
205 return (a->mle_grade >= b->mle_grade);
206
207 default:
208 panic("lomac_dominate_element: b->mle_type invalid");
209 }
210
211 default:
212 panic("lomac_dominate_element: a->mle_type invalid");
213 }
214 }
215
216 static int
217 lomac_range_in_range(struct mac_lomac *rangea, struct mac_lomac *rangeb)
218 {
219
220 return (lomac_dominate_element(&rangeb->ml_rangehigh,
221 &rangea->ml_rangehigh) &&
222 lomac_dominate_element(&rangea->ml_rangelow,
223 &rangeb->ml_rangelow));
224 }
225
226 static int
227 lomac_single_in_range(struct mac_lomac *single, struct mac_lomac *range)
228 {
229
230 KASSERT((single->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0,
231 ("lomac_single_in_range: a not single"));
232 KASSERT((range->ml_flags & MAC_LOMAC_FLAG_RANGE) != 0,
233 ("lomac_single_in_range: b not range"));
234
235 return (lomac_dominate_element(&range->ml_rangehigh,
236 &single->ml_single) && lomac_dominate_element(&single->ml_single,
237 &range->ml_rangelow));
238 }
239
240 static int
241 lomac_auxsingle_in_range(struct mac_lomac *single, struct mac_lomac *range)
242 {
243
244 KASSERT((single->ml_flags & MAC_LOMAC_FLAG_AUX) != 0,
245 ("lomac_single_in_range: a not auxsingle"));
246 KASSERT((range->ml_flags & MAC_LOMAC_FLAG_RANGE) != 0,
247 ("lomac_single_in_range: b not range"));
248
249 return (lomac_dominate_element(&range->ml_rangehigh,
250 &single->ml_auxsingle) &&
251 lomac_dominate_element(&single->ml_auxsingle,
252 &range->ml_rangelow));
253 }
254
255 static int
256 lomac_dominate_single(struct mac_lomac *a, struct mac_lomac *b)
257 {
258 KASSERT((a->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0,
259 ("lomac_dominate_single: a not single"));
260 KASSERT((b->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0,
261 ("lomac_dominate_single: b not single"));
262
263 return (lomac_dominate_element(&a->ml_single, &b->ml_single));
264 }
265
266 static int
267 lomac_subject_dominate(struct mac_lomac *a, struct mac_lomac *b)
268 {
269 KASSERT((~a->ml_flags &
270 (MAC_LOMAC_FLAG_SINGLE | MAC_LOMAC_FLAG_RANGE)) == 0,
271 ("lomac_dominate_single: a not subject"));
272 KASSERT((b->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0,
273 ("lomac_dominate_single: b not single"));
274
275 return (lomac_dominate_element(&a->ml_rangehigh, &b->ml_single));
276 }
277
278 static int
279 lomac_equal_element(struct mac_lomac_element *a, struct mac_lomac_element *b)
280 {
281
282 if (a->mle_type == MAC_LOMAC_TYPE_EQUAL ||
283 b->mle_type == MAC_LOMAC_TYPE_EQUAL)
284 return (1);
285
286 return (a->mle_type == b->mle_type && a->mle_grade == b->mle_grade);
287 }
288
289 static int
290 lomac_equal_single(struct mac_lomac *a, struct mac_lomac *b)
291 {
292
293 KASSERT((a->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0,
294 ("lomac_equal_single: a not single"));
295 KASSERT((b->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0,
296 ("lomac_equal_single: b not single"));
297
298 return (lomac_equal_element(&a->ml_single, &b->ml_single));
299 }
300
301 static int
302 lomac_contains_equal(struct mac_lomac *ml)
303 {
304
305 if (ml->ml_flags & MAC_LOMAC_FLAG_SINGLE)
306 if (ml->ml_single.mle_type == MAC_LOMAC_TYPE_EQUAL)
307 return (1);
308 if (ml->ml_flags & MAC_LOMAC_FLAG_AUX)
309 if (ml->ml_auxsingle.mle_type == MAC_LOMAC_TYPE_EQUAL)
310 return (1);
311
312 if (ml->ml_flags & MAC_LOMAC_FLAG_RANGE) {
313 if (ml->ml_rangelow.mle_type == MAC_LOMAC_TYPE_EQUAL)
314 return (1);
315 if (ml->ml_rangehigh.mle_type == MAC_LOMAC_TYPE_EQUAL)
316 return (1);
317 }
318
319 return (0);
320 }
321
322 static int
323 lomac_subject_privileged(struct mac_lomac *ml)
324 {
325
326 KASSERT((ml->ml_flags & MAC_LOMAC_FLAGS_BOTH) ==
327 MAC_LOMAC_FLAGS_BOTH,
328 ("lomac_subject_privileged: subject doesn't have both labels"));
329
330 /* If the single is EQUAL, it's ok. */
331 if (ml->ml_single.mle_type == MAC_LOMAC_TYPE_EQUAL)
332 return (0);
333
334 /* If either range endpoint is EQUAL, it's ok. */
335 if (ml->ml_rangelow.mle_type == MAC_LOMAC_TYPE_EQUAL ||
336 ml->ml_rangehigh.mle_type == MAC_LOMAC_TYPE_EQUAL)
337 return (0);
338
339 /* If the range is low-high, it's ok. */
340 if (ml->ml_rangelow.mle_type == MAC_LOMAC_TYPE_LOW &&
341 ml->ml_rangehigh.mle_type == MAC_LOMAC_TYPE_HIGH)
342 return (0);
343
344 /* It's not ok. */
345 return (EPERM);
346 }
347
348 static int
349 lomac_high_single(struct mac_lomac *ml)
350 {
351
352 KASSERT((ml->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0,
353 ("lomac_high_single: mac_lomac not single"));
354
355 return (ml->ml_single.mle_type == MAC_LOMAC_TYPE_HIGH);
356 }
357
358 static int
359 lomac_valid(struct mac_lomac *ml)
360 {
361
362 if (ml->ml_flags & MAC_LOMAC_FLAG_SINGLE) {
363 switch (ml->ml_single.mle_type) {
364 case MAC_LOMAC_TYPE_GRADE:
365 case MAC_LOMAC_TYPE_EQUAL:
366 case MAC_LOMAC_TYPE_HIGH:
367 case MAC_LOMAC_TYPE_LOW:
368 break;
369
370 default:
371 return (EINVAL);
372 }
373 } else {
374 if (ml->ml_single.mle_type != MAC_LOMAC_TYPE_UNDEF)
375 return (EINVAL);
376 }
377
378 if (ml->ml_flags & MAC_LOMAC_FLAG_AUX) {
379 switch (ml->ml_auxsingle.mle_type) {
380 case MAC_LOMAC_TYPE_GRADE:
381 case MAC_LOMAC_TYPE_EQUAL:
382 case MAC_LOMAC_TYPE_HIGH:
383 case MAC_LOMAC_TYPE_LOW:
384 break;
385
386 default:
387 return (EINVAL);
388 }
389 } else {
390 if (ml->ml_auxsingle.mle_type != MAC_LOMAC_TYPE_UNDEF)
391 return (EINVAL);
392 }
393
394 if (ml->ml_flags & MAC_LOMAC_FLAG_RANGE) {
395 switch (ml->ml_rangelow.mle_type) {
396 case MAC_LOMAC_TYPE_GRADE:
397 case MAC_LOMAC_TYPE_EQUAL:
398 case MAC_LOMAC_TYPE_HIGH:
399 case MAC_LOMAC_TYPE_LOW:
400 break;
401
402 default:
403 return (EINVAL);
404 }
405
406 switch (ml->ml_rangehigh.mle_type) {
407 case MAC_LOMAC_TYPE_GRADE:
408 case MAC_LOMAC_TYPE_EQUAL:
409 case MAC_LOMAC_TYPE_HIGH:
410 case MAC_LOMAC_TYPE_LOW:
411 break;
412
413 default:
414 return (EINVAL);
415 }
416 if (!lomac_dominate_element(&ml->ml_rangehigh,
417 &ml->ml_rangelow))
418 return (EINVAL);
419 } else {
420 if (ml->ml_rangelow.mle_type != MAC_LOMAC_TYPE_UNDEF ||
421 ml->ml_rangehigh.mle_type != MAC_LOMAC_TYPE_UNDEF)
422 return (EINVAL);
423 }
424
425 return (0);
426 }
427
428 static void
429 lomac_set_range(struct mac_lomac *ml, u_short typelow, u_short gradelow,
430 u_short typehigh, u_short gradehigh)
431 {
432
433 ml->ml_rangelow.mle_type = typelow;
434 ml->ml_rangelow.mle_grade = gradelow;
435 ml->ml_rangehigh.mle_type = typehigh;
436 ml->ml_rangehigh.mle_grade = gradehigh;
437 ml->ml_flags |= MAC_LOMAC_FLAG_RANGE;
438 }
439
440 static void
441 lomac_set_single(struct mac_lomac *ml, u_short type, u_short grade)
442 {
443
444 ml->ml_single.mle_type = type;
445 ml->ml_single.mle_grade = grade;
446 ml->ml_flags |= MAC_LOMAC_FLAG_SINGLE;
447 }
448
449 static void
450 lomac_copy_range(struct mac_lomac *labelfrom, struct mac_lomac *labelto)
451 {
452
453 KASSERT((labelfrom->ml_flags & MAC_LOMAC_FLAG_RANGE) != 0,
454 ("lomac_copy_range: labelfrom not range"));
455
456 labelto->ml_rangelow = labelfrom->ml_rangelow;
457 labelto->ml_rangehigh = labelfrom->ml_rangehigh;
458 labelto->ml_flags |= MAC_LOMAC_FLAG_RANGE;
459 }
460
461 static void
462 lomac_copy_single(struct mac_lomac *labelfrom, struct mac_lomac *labelto)
463 {
464
465 KASSERT((labelfrom->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0,
466 ("lomac_copy_single: labelfrom not single"));
467
468 labelto->ml_single = labelfrom->ml_single;
469 labelto->ml_flags |= MAC_LOMAC_FLAG_SINGLE;
470 }
471
472 static void
473 lomac_copy_auxsingle(struct mac_lomac *labelfrom, struct mac_lomac *labelto)
474 {
475
476 KASSERT((labelfrom->ml_flags & MAC_LOMAC_FLAG_AUX) != 0,
477 ("lomac_copy_auxsingle: labelfrom not auxsingle"));
478
479 labelto->ml_auxsingle = labelfrom->ml_auxsingle;
480 labelto->ml_flags |= MAC_LOMAC_FLAG_AUX;
481 }
482
483 static void
484 lomac_copy(struct mac_lomac *source, struct mac_lomac *dest)
485 {
486
487 if (source->ml_flags & MAC_LOMAC_FLAG_SINGLE)
488 lomac_copy_single(source, dest);
489 if (source->ml_flags & MAC_LOMAC_FLAG_AUX)
490 lomac_copy_auxsingle(source, dest);
491 if (source->ml_flags & MAC_LOMAC_FLAG_RANGE)
492 lomac_copy_range(source, dest);
493 }
494
495 static int lomac_to_string(struct sbuf *sb, struct mac_lomac *ml);
496
497 static int
498 maybe_demote(struct mac_lomac *subjlabel, struct mac_lomac *objlabel,
499 const char *actionname, const char *objname, struct vnode *vp)
500 {
501 struct sbuf subjlabel_sb, subjtext_sb, objlabel_sb;
502 char *subjlabeltext, *objlabeltext, *subjtext;
503 struct mac_lomac cached_subjlabel;
504 struct mac_lomac_proc *subj;
505 struct vattr va;
506 struct proc *p;
507 pid_t pgid;
508
509 subj = PSLOT(curthread->td_proc->p_label);
510
511 p = curthread->td_proc;
512 mtx_lock(&subj->mtx);
513 if (subj->mac_lomac.ml_flags & MAC_LOMAC_FLAG_UPDATE) {
514 /*
515 * Check to see if the pending demotion would be more or less
516 * severe than this one, and keep the more severe. This can
517 * only happen for a multi-threaded application.
518 */
519 if (lomac_dominate_single(objlabel, &subj->mac_lomac)) {
520 mtx_unlock(&subj->mtx);
521 return (0);
522 }
523 }
524 bzero(&subj->mac_lomac, sizeof(subj->mac_lomac));
525 /*
526 * Always demote the single label.
527 */
528 lomac_copy_single(objlabel, &subj->mac_lomac);
529 /*
530 * Start with the original range, then minimize each side of the
531 * range to the point of not dominating the object. The high side
532 * will always be demoted, of course.
533 */
534 lomac_copy_range(subjlabel, &subj->mac_lomac);
535 if (!lomac_dominate_element(&objlabel->ml_single,
536 &subj->mac_lomac.ml_rangelow))
537 subj->mac_lomac.ml_rangelow = objlabel->ml_single;
538 subj->mac_lomac.ml_rangehigh = objlabel->ml_single;
539 subj->mac_lomac.ml_flags |= MAC_LOMAC_FLAG_UPDATE;
540 thread_lock(curthread);
541 curthread->td_flags |= TDF_ASTPENDING | TDF_MACPEND;
542 thread_unlock(curthread);
543
544 /*
545 * Avoid memory allocation while holding a mutex; cache the label.
546 */
547 lomac_copy_single(&subj->mac_lomac, &cached_subjlabel);
548 mtx_unlock(&subj->mtx);
549
550 sbuf_new(&subjlabel_sb, NULL, 0, SBUF_AUTOEXTEND);
551 lomac_to_string(&subjlabel_sb, subjlabel);
552 sbuf_finish(&subjlabel_sb);
553 subjlabeltext = sbuf_data(&subjlabel_sb);
554
555 sbuf_new(&subjtext_sb, NULL, 0, SBUF_AUTOEXTEND);
556 lomac_to_string(&subjtext_sb, &subj->mac_lomac);
557 sbuf_finish(&subjtext_sb);
558 subjtext = sbuf_data(&subjtext_sb);
559
560 sbuf_new(&objlabel_sb, NULL, 0, SBUF_AUTOEXTEND);
561 lomac_to_string(&objlabel_sb, objlabel);
562 sbuf_finish(&objlabel_sb);
563 objlabeltext = sbuf_data(&objlabel_sb);
564
565 pgid = p->p_pgrp->pg_id; /* XXX could be stale? */
566 if (vp != NULL && VOP_GETATTR(vp, &va, curthread->td_ucred) == 0) {
567 log(LOG_INFO, "LOMAC: level-%s subject p%dg%du%d:%s demoted to"
568 " level %s after %s a level-%s %s (inode=%ld, "
569 "mountpount=%s)\n",
570 subjlabeltext, p->p_pid, pgid, curthread->td_ucred->cr_uid,
571 p->p_comm, subjtext, actionname, objlabeltext, objname,
572 va.va_fileid, vp->v_mount->mnt_stat.f_mntonname);
573 } else {
574 log(LOG_INFO, "LOMAC: level-%s subject p%dg%du%d:%s demoted to"
575 " level %s after %s a level-%s %s\n",
576 subjlabeltext, p->p_pid, pgid, curthread->td_ucred->cr_uid,
577 p->p_comm, subjtext, actionname, objlabeltext, objname);
578 }
579
580 sbuf_delete(&subjlabel_sb);
581 sbuf_delete(&subjtext_sb);
582 sbuf_delete(&objlabel_sb);
583
584 return (0);
585 }
586
587 /*
588 * Relabel "to" to "from" only if "from" is a valid label (contains at least
589 * a single), as for a relabel operation which may or may not involve a
590 * relevant label.
591 */
592 static void
593 try_relabel(struct mac_lomac *from, struct mac_lomac *to)
594 {
595
596 if (from->ml_flags & MAC_LOMAC_FLAG_SINGLE) {
597 bzero(to, sizeof(*to));
598 lomac_copy(from, to);
599 }
600 }
601
602 /*
603 * Policy module operations.
604 */
605 static void
606 lomac_init(struct mac_policy_conf *conf)
607 {
608
609 }
610
611 /*
612 * Label operations.
613 */
614 static void
615 lomac_init_label(struct label *label)
616 {
617
618 SLOT_SET(label, lomac_alloc(M_WAITOK));
619 }
620
621 static int
622 lomac_init_label_waitcheck(struct label *label, int flag)
623 {
624
625 SLOT_SET(label, lomac_alloc(flag));
626 if (SLOT(label) == NULL)
627 return (ENOMEM);
628
629 return (0);
630 }
631
632 static void
633 lomac_destroy_label(struct label *label)
634 {
635
636 lomac_free(SLOT(label));
637 SLOT_SET(label, NULL);
638 }
639
640 static int
641 lomac_element_to_string(struct sbuf *sb, struct mac_lomac_element *element)
642 {
643
644 switch (element->mle_type) {
645 case MAC_LOMAC_TYPE_HIGH:
646 return (sbuf_printf(sb, "high"));
647
648 case MAC_LOMAC_TYPE_LOW:
649 return (sbuf_printf(sb, "low"));
650
651 case MAC_LOMAC_TYPE_EQUAL:
652 return (sbuf_printf(sb, "equal"));
653
654 case MAC_LOMAC_TYPE_GRADE:
655 return (sbuf_printf(sb, "%d", element->mle_grade));
656
657 default:
658 panic("lomac_element_to_string: invalid type (%d)",
659 element->mle_type);
660 }
661 }
662
663 static int
664 lomac_to_string(struct sbuf *sb, struct mac_lomac *ml)
665 {
666
667 if (ml->ml_flags & MAC_LOMAC_FLAG_SINGLE) {
668 if (lomac_element_to_string(sb, &ml->ml_single) == -1)
669 return (EINVAL);
670 }
671
672 if (ml->ml_flags & MAC_LOMAC_FLAG_AUX) {
673 if (sbuf_putc(sb, '[') == -1)
674 return (EINVAL);
675
676 if (lomac_element_to_string(sb, &ml->ml_auxsingle) == -1)
677 return (EINVAL);
678
679 if (sbuf_putc(sb, ']') == -1)
680 return (EINVAL);
681 }
682
683 if (ml->ml_flags & MAC_LOMAC_FLAG_RANGE) {
684 if (sbuf_putc(sb, '(') == -1)
685 return (EINVAL);
686
687 if (lomac_element_to_string(sb, &ml->ml_rangelow) == -1)
688 return (EINVAL);
689
690 if (sbuf_putc(sb, '-') == -1)
691 return (EINVAL);
692
693 if (lomac_element_to_string(sb, &ml->ml_rangehigh) == -1)
694 return (EINVAL);
695
696 if (sbuf_putc(sb, ')') == -1)
697 return (EINVAL);
698 }
699
700 return (0);
701 }
702
703 static int
704 lomac_externalize_label(struct label *label, char *element_name,
705 struct sbuf *sb, int *claimed)
706 {
707 struct mac_lomac *ml;
708
709 if (strcmp(MAC_LOMAC_LABEL_NAME, element_name) != 0)
710 return (0);
711
712 (*claimed)++;
713
714 ml = SLOT(label);
715
716 return (lomac_to_string(sb, ml));
717 }
718
719 static int
720 lomac_parse_element(struct mac_lomac_element *element, char *string)
721 {
722
723 if (strcmp(string, "high") == 0 || strcmp(string, "hi") == 0) {
724 element->mle_type = MAC_LOMAC_TYPE_HIGH;
725 element->mle_grade = MAC_LOMAC_TYPE_UNDEF;
726 } else if (strcmp(string, "low") == 0 || strcmp(string, "lo") == 0) {
727 element->mle_type = MAC_LOMAC_TYPE_LOW;
728 element->mle_grade = MAC_LOMAC_TYPE_UNDEF;
729 } else if (strcmp(string, "equal") == 0 ||
730 strcmp(string, "eq") == 0) {
731 element->mle_type = MAC_LOMAC_TYPE_EQUAL;
732 element->mle_grade = MAC_LOMAC_TYPE_UNDEF;
733 } else {
734 char *p0, *p1;
735 int d;
736
737 p0 = string;
738 d = strtol(p0, &p1, 10);
739
740 if (d < 0 || d > 65535)
741 return (EINVAL);
742 element->mle_type = MAC_LOMAC_TYPE_GRADE;
743 element->mle_grade = d;
744
745 if (p1 == p0 || *p1 != '\0')
746 return (EINVAL);
747 }
748
749 return (0);
750 }
751
752 /*
753 * Note: destructively consumes the string, make a local copy before calling
754 * if that's a problem.
755 */
756 static int
757 lomac_parse(struct mac_lomac *ml, char *string)
758 {
759 char *range, *rangeend, *rangehigh, *rangelow, *single, *auxsingle,
760 *auxsingleend;
761 int error;
762
763 /* Do we have a range? */
764 single = string;
765 range = index(string, '(');
766 if (range == single)
767 single = NULL;
768 auxsingle = index(string, '[');
769 if (auxsingle == single)
770 single = NULL;
771 if (range != NULL && auxsingle != NULL)
772 return (EINVAL);
773 rangelow = rangehigh = NULL;
774 if (range != NULL) {
775 /* Nul terminate the end of the single string. */
776 *range = '\0';
777 range++;
778 rangelow = range;
779 rangehigh = index(rangelow, '-');
780 if (rangehigh == NULL)
781 return (EINVAL);
782 rangehigh++;
783 if (*rangelow == '\0' || *rangehigh == '\0')
784 return (EINVAL);
785 rangeend = index(rangehigh, ')');
786 if (rangeend == NULL)
787 return (EINVAL);
788 if (*(rangeend + 1) != '\0')
789 return (EINVAL);
790 /* Nul terminate the ends of the ranges. */
791 *(rangehigh - 1) = '\0';
792 *rangeend = '\0';
793 }
794 KASSERT((rangelow != NULL && rangehigh != NULL) ||
795 (rangelow == NULL && rangehigh == NULL),
796 ("lomac_internalize_label: range mismatch"));
797 if (auxsingle != NULL) {
798 /* Nul terminate the end of the single string. */
799 *auxsingle = '\0';
800 auxsingle++;
801 auxsingleend = index(auxsingle, ']');
802 if (auxsingleend == NULL)
803 return (EINVAL);
804 if (*(auxsingleend + 1) != '\0')
805 return (EINVAL);
806 /* Nul terminate the end of the auxsingle. */
807 *auxsingleend = '\0';
808 }
809
810 bzero(ml, sizeof(*ml));
811 if (single != NULL) {
812 error = lomac_parse_element(&ml->ml_single, single);
813 if (error)
814 return (error);
815 ml->ml_flags |= MAC_LOMAC_FLAG_SINGLE;
816 }
817
818 if (auxsingle != NULL) {
819 error = lomac_parse_element(&ml->ml_auxsingle, auxsingle);
820 if (error)
821 return (error);
822 ml->ml_flags |= MAC_LOMAC_FLAG_AUX;
823 }
824
825 if (rangelow != NULL) {
826 error = lomac_parse_element(&ml->ml_rangelow, rangelow);
827 if (error)
828 return (error);
829 error = lomac_parse_element(&ml->ml_rangehigh, rangehigh);
830 if (error)
831 return (error);
832 ml->ml_flags |= MAC_LOMAC_FLAG_RANGE;
833 }
834
835 error = lomac_valid(ml);
836 if (error)
837 return (error);
838
839 return (0);
840 }
841
842 static int
843 lomac_internalize_label(struct label *label, char *element_name,
844 char *element_data, int *claimed)
845 {
846 struct mac_lomac *ml, ml_temp;
847 int error;
848
849 if (strcmp(MAC_LOMAC_LABEL_NAME, element_name) != 0)
850 return (0);
851
852 (*claimed)++;
853
854 error = lomac_parse(&ml_temp, element_data);
855 if (error)
856 return (error);
857
858 ml = SLOT(label);
859 *ml = ml_temp;
860
861 return (0);
862 }
863
864 static void
865 lomac_copy_label(struct label *src, struct label *dest)
866 {
867
868 *SLOT(dest) = *SLOT(src);
869 }
870
871 /*
872 * Object-specific entry point implementations are sorted alphabetically by
873 * object type name and then by operation.
874 */
875 static int
876 lomac_bpfdesc_check_receive(struct bpf_d *d, struct label *dlabel,
877 struct ifnet *ifp, struct label *ifplabel)
878 {
879 struct mac_lomac *a, *b;
880
881 if (!lomac_enabled)
882 return (0);
883
884 a = SLOT(dlabel);
885 b = SLOT(ifplabel);
886
887 if (lomac_equal_single(a, b))
888 return (0);
889 return (EACCES);
890 }
891
892 static void
893 lomac_bpfdesc_create(struct ucred *cred, struct bpf_d *d,
894 struct label *dlabel)
895 {
896 struct mac_lomac *source, *dest;
897
898 source = SLOT(cred->cr_label);
899 dest = SLOT(dlabel);
900
901 lomac_copy_single(source, dest);
902 }
903
904 static void
905 lomac_bpfdesc_create_mbuf(struct bpf_d *d, struct label *dlabel,
906 struct mbuf *m, struct label *mlabel)
907 {
908 struct mac_lomac *source, *dest;
909
910 source = SLOT(dlabel);
911 dest = SLOT(mlabel);
912
913 lomac_copy_single(source, dest);
914 }
915
916 static int
917 lomac_cred_check_relabel(struct ucred *cred, struct label *newlabel)
918 {
919 struct mac_lomac *subj, *new;
920 int error;
921
922 subj = SLOT(cred->cr_label);
923 new = SLOT(newlabel);
924
925 /*
926 * If there is a LOMAC label update for the credential, it may be an
927 * update of the single, range, or both.
928 */
929 error = lomac_atmostflags(new, MAC_LOMAC_FLAGS_BOTH);
930 if (error)
931 return (error);
932
933 /*
934 * If the LOMAC label is to be changed, authorize as appropriate.
935 */
936 if (new->ml_flags & MAC_LOMAC_FLAGS_BOTH) {
937 /*
938 * Fill in the missing parts from the previous label.
939 */
940 if ((new->ml_flags & MAC_LOMAC_FLAG_SINGLE) == 0)
941 lomac_copy_single(subj, new);
942 if ((new->ml_flags & MAC_LOMAC_FLAG_RANGE) == 0)
943 lomac_copy_range(subj, new);
944
945 /*
946 * To change the LOMAC range on a credential, the new range
947 * label must be in the current range.
948 */
949 if (!lomac_range_in_range(new, subj))
950 return (EPERM);
951
952 /*
953 * To change the LOMAC single label on a credential, the new
954 * single label must be in the new range. Implicitly from
955 * the previous check, the new single is in the old range.
956 */
957 if (!lomac_single_in_range(new, new))
958 return (EPERM);
959
960 /*
961 * To have EQUAL in any component of the new credential LOMAC
962 * label, the subject must already have EQUAL in their label.
963 */
964 if (lomac_contains_equal(new)) {
965 error = lomac_subject_privileged(subj);
966 if (error)
967 return (error);
968 }
969
970 /*
971 * XXXMAC: Additional consistency tests regarding the single
972 * and range of the new label might be performed here.
973 */
974 }
975
976 return (0);
977 }
978
979 static int
980 lomac_cred_check_visible(struct ucred *cr1, struct ucred *cr2)
981 {
982 struct mac_lomac *subj, *obj;
983
984 if (!lomac_enabled)
985 return (0);
986
987 subj = SLOT(cr1->cr_label);
988 obj = SLOT(cr2->cr_label);
989
990 /* XXX: range */
991 if (!lomac_dominate_single(obj, subj))
992 return (ESRCH);
993
994 return (0);
995 }
996
997 static void
998 lomac_cred_create_init(struct ucred *cred)
999 {
1000 struct mac_lomac *dest;
1001
1002 dest = SLOT(cred->cr_label);
1003
1004 lomac_set_single(dest, MAC_LOMAC_TYPE_HIGH, 0);
1005 lomac_set_range(dest, MAC_LOMAC_TYPE_LOW, 0, MAC_LOMAC_TYPE_HIGH, 0);
1006 }
1007
1008 static void
1009 lomac_cred_create_swapper(struct ucred *cred)
1010 {
1011 struct mac_lomac *dest;
1012
1013 dest = SLOT(cred->cr_label);
1014
1015 lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0);
1016 lomac_set_range(dest, MAC_LOMAC_TYPE_LOW, 0, MAC_LOMAC_TYPE_HIGH, 0);
1017 }
1018
1019 static void
1020 lomac_cred_relabel(struct ucred *cred, struct label *newlabel)
1021 {
1022 struct mac_lomac *source, *dest;
1023
1024 source = SLOT(newlabel);
1025 dest = SLOT(cred->cr_label);
1026
1027 try_relabel(source, dest);
1028 }
1029
1030 static void
1031 lomac_devfs_create_device(struct ucred *cred, struct mount *mp,
1032 struct cdev *dev, struct devfs_dirent *de, struct label *delabel)
1033 {
1034 struct mac_lomac *ml;
1035 int lomac_type;
1036
1037 ml = SLOT(delabel);
1038 if (strcmp(dev->si_name, "null") == 0 ||
1039 strcmp(dev->si_name, "zero") == 0 ||
1040 strcmp(dev->si_name, "random") == 0 ||
1041 strncmp(dev->si_name, "fd/", strlen("fd/")) == 0 ||
1042 strncmp(dev->si_name, "ttyv", strlen("ttyv")) == 0)
1043 lomac_type = MAC_LOMAC_TYPE_EQUAL;
1044 else if (ptys_equal &&
1045 (strncmp(dev->si_name, "ttyp", strlen("ttyp")) == 0 ||
1046 strncmp(dev->si_name, "pts/", strlen("pts/")) == 0 ||
1047 strncmp(dev->si_name, "ptyp", strlen("ptyp")) == 0))
1048 lomac_type = MAC_LOMAC_TYPE_EQUAL;
1049 else
1050 lomac_type = MAC_LOMAC_TYPE_HIGH;
1051 lomac_set_single(ml, lomac_type, 0);
1052 }
1053
1054 static void
1055 lomac_devfs_create_directory(struct mount *mp, char *dirname, int dirnamelen,
1056 struct devfs_dirent *de, struct label *delabel)
1057 {
1058 struct mac_lomac *ml;
1059
1060 ml = SLOT(delabel);
1061 lomac_set_single(ml, MAC_LOMAC_TYPE_HIGH, 0);
1062 }
1063
1064 static void
1065 lomac_devfs_create_symlink(struct ucred *cred, struct mount *mp,
1066 struct devfs_dirent *dd, struct label *ddlabel, struct devfs_dirent *de,
1067 struct label *delabel)
1068 {
1069 struct mac_lomac *source, *dest;
1070
1071 source = SLOT(cred->cr_label);
1072 dest = SLOT(delabel);
1073
1074 lomac_copy_single(source, dest);
1075 }
1076
1077 static void
1078 lomac_devfs_update(struct mount *mp, struct devfs_dirent *de,
1079 struct label *delabel, struct vnode *vp, struct label *vplabel)
1080 {
1081 struct mac_lomac *source, *dest;
1082
1083 source = SLOT(vplabel);
1084 dest = SLOT(delabel);
1085
1086 lomac_copy(source, dest);
1087 }
1088
1089 static void
1090 lomac_devfs_vnode_associate(struct mount *mp, struct label *mplabel,
1091 struct devfs_dirent *de, struct label *delabel, struct vnode *vp,
1092 struct label *vplabel)
1093 {
1094 struct mac_lomac *source, *dest;
1095
1096 source = SLOT(delabel);
1097 dest = SLOT(vplabel);
1098
1099 lomac_copy_single(source, dest);
1100 }
1101
1102 static int
1103 lomac_ifnet_check_relabel(struct ucred *cred, struct ifnet *ifp,
1104 struct label *ifplabel, struct label *newlabel)
1105 {
1106 struct mac_lomac *subj, *new;
1107 int error;
1108
1109 subj = SLOT(cred->cr_label);
1110 new = SLOT(newlabel);
1111
1112 /*
1113 * If there is a LOMAC label update for the interface, it may be an
1114 * update of the single, range, or both.
1115 */
1116 error = lomac_atmostflags(new, MAC_LOMAC_FLAGS_BOTH);
1117 if (error)
1118 return (error);
1119
1120 /*
1121 * Relabling network interfaces requires LOMAC privilege.
1122 */
1123 error = lomac_subject_privileged(subj);
1124 if (error)
1125 return (error);
1126
1127 /*
1128 * If the LOMAC label is to be changed, authorize as appropriate.
1129 */
1130 if (new->ml_flags & MAC_LOMAC_FLAGS_BOTH) {
1131 /*
1132 * Fill in the missing parts from the previous label.
1133 */
1134 if ((new->ml_flags & MAC_LOMAC_FLAG_SINGLE) == 0)
1135 lomac_copy_single(subj, new);
1136 if ((new->ml_flags & MAC_LOMAC_FLAG_RANGE) == 0)
1137 lomac_copy_range(subj, new);
1138
1139 /*
1140 * Rely on the traditional superuser status for the LOMAC
1141 * interface relabel requirements. XXXMAC: This will go
1142 * away.
1143 *
1144 * XXXRW: This is also redundant to a higher layer check.
1145 */
1146 error = priv_check_cred(cred, PRIV_NET_SETIFMAC, 0);
1147 if (error)
1148 return (EPERM);
1149
1150 /*
1151 * XXXMAC: Additional consistency tests regarding the single
1152 * and the range of the new label might be performed here.
1153 */
1154 }
1155
1156 return (0);
1157 }
1158
1159 static int
1160 lomac_ifnet_check_transmit(struct ifnet *ifp, struct label *ifplabel,
1161 struct mbuf *m, struct label *mlabel)
1162 {
1163 struct mac_lomac *p, *i;
1164
1165 if (!lomac_enabled)
1166 return (0);
1167
1168 p = SLOT(mlabel);
1169 i = SLOT(ifplabel);
1170
1171 return (lomac_single_in_range(p, i) ? 0 : EACCES);
1172 }
1173
1174 static void
1175 lomac_ifnet_create(struct ifnet *ifp, struct label *ifplabel)
1176 {
1177 char tifname[IFNAMSIZ], *p, *q;
1178 char tiflist[sizeof(trusted_interfaces)];
1179 struct mac_lomac *dest;
1180 int len, grade;
1181
1182 dest = SLOT(ifplabel);
1183
1184 if (ifp->if_type == IFT_LOOP) {
1185 grade = MAC_LOMAC_TYPE_EQUAL;
1186 goto set;
1187 }
1188
1189 if (trust_all_interfaces) {
1190 grade = MAC_LOMAC_TYPE_HIGH;
1191 goto set;
1192 }
1193
1194 grade = MAC_LOMAC_TYPE_LOW;
1195
1196 if (trusted_interfaces[0] == '\0' ||
1197 !strvalid(trusted_interfaces, sizeof(trusted_interfaces)))
1198 goto set;
1199
1200 bzero(tiflist, sizeof(tiflist));
1201 for (p = trusted_interfaces, q = tiflist; *p != '\0'; p++, q++)
1202 if(*p != ' ' && *p != '\t')
1203 *q = *p;
1204
1205 for (p = q = tiflist;; p++) {
1206 if (*p == ',' || *p == '\0') {
1207 len = p - q;
1208 if (len < IFNAMSIZ) {
1209 bzero(tifname, sizeof(tifname));
1210 bcopy(q, tifname, len);
1211 if (strcmp(tifname, ifp->if_xname) == 0) {
1212 grade = MAC_LOMAC_TYPE_HIGH;
1213 break;
1214 }
1215 }
1216 else {
1217 *p = '\0';
1218 printf("MAC/LOMAC warning: interface name "
1219 "\"%s\" is too long (must be < %d)\n",
1220 q, IFNAMSIZ);
1221 }
1222 if (*p == '\0')
1223 break;
1224 q = p + 1;
1225 }
1226 }
1227 set:
1228 lomac_set_single(dest, grade, 0);
1229 lomac_set_range(dest, grade, 0, grade, 0);
1230 }
1231
1232 static void
1233 lomac_ifnet_create_mbuf(struct ifnet *ifp, struct label *ifplabel,
1234 struct mbuf *m, struct label *mlabel)
1235 {
1236 struct mac_lomac *source, *dest;
1237
1238 source = SLOT(ifplabel);
1239 dest = SLOT(mlabel);
1240
1241 lomac_copy_single(source, dest);
1242 }
1243
1244 static void
1245 lomac_ifnet_relabel(struct ucred *cred, struct ifnet *ifp,
1246 struct label *ifplabel, struct label *newlabel)
1247 {
1248 struct mac_lomac *source, *dest;
1249
1250 source = SLOT(newlabel);
1251 dest = SLOT(ifplabel);
1252
1253 try_relabel(source, dest);
1254 }
1255
1256 static int
1257 lomac_inpcb_check_deliver(struct inpcb *inp, struct label *inplabel,
1258 struct mbuf *m, struct label *mlabel)
1259 {
1260 struct mac_lomac *p, *i;
1261
1262 if (!lomac_enabled)
1263 return (0);
1264
1265 p = SLOT(mlabel);
1266 i = SLOT(inplabel);
1267
1268 return (lomac_equal_single(p, i) ? 0 : EACCES);
1269 }
1270
1271 static int
1272 lomac_inpcb_check_visible(struct ucred *cred, struct inpcb *inp,
1273 struct label *inplabel)
1274 {
1275 struct mac_lomac *subj, *obj;
1276
1277 if (!lomac_enabled)
1278 return (0);
1279
1280 subj = SLOT(cred->cr_label);
1281 obj = SLOT(inplabel);
1282
1283 if (!lomac_dominate_single(obj, subj))
1284 return (ENOENT);
1285
1286 return (0);
1287 }
1288
1289 static void
1290 lomac_inpcb_create(struct socket *so, struct label *solabel,
1291 struct inpcb *inp, struct label *inplabel)
1292 {
1293 struct mac_lomac *source, *dest;
1294
1295 source = SLOT(solabel);
1296 dest = SLOT(inplabel);
1297
1298 lomac_copy_single(source, dest);
1299 }
1300
1301 static void
1302 lomac_inpcb_create_mbuf(struct inpcb *inp, struct label *inplabel,
1303 struct mbuf *m, struct label *mlabel)
1304 {
1305 struct mac_lomac *source, *dest;
1306
1307 source = SLOT(inplabel);
1308 dest = SLOT(mlabel);
1309
1310 lomac_copy_single(source, dest);
1311 }
1312
1313 static void
1314 lomac_inpcb_sosetlabel(struct socket *so, struct label *solabel,
1315 struct inpcb *inp, struct label *inplabel)
1316 {
1317 struct mac_lomac *source, *dest;
1318
1319 SOCK_LOCK_ASSERT(so);
1320
1321 source = SLOT(solabel);
1322 dest = SLOT(inplabel);
1323
1324 lomac_copy_single(source, dest);
1325 }
1326
1327 static void
1328 lomac_ip6q_create(struct mbuf *m, struct label *mlabel, struct ip6q *q6,
1329 struct label *q6label)
1330 {
1331 struct mac_lomac *source, *dest;
1332
1333 source = SLOT(mlabel);
1334 dest = SLOT(q6label);
1335
1336 lomac_copy_single(source, dest);
1337 }
1338
1339 static int
1340 lomac_ip6q_match(struct mbuf *m, struct label *mlabel, struct ip6q *q6,
1341 struct label *q6label)
1342 {
1343 struct mac_lomac *a, *b;
1344
1345 a = SLOT(q6label);
1346 b = SLOT(mlabel);
1347
1348 return (lomac_equal_single(a, b));
1349 }
1350
1351 static void
1352 lomac_ip6q_reassemble(struct ip6q *q6, struct label *q6label, struct mbuf *m,
1353 struct label *mlabel)
1354 {
1355 struct mac_lomac *source, *dest;
1356
1357 source = SLOT(q6label);
1358 dest = SLOT(mlabel);
1359
1360 /* Just use the head, since we require them all to match. */
1361 lomac_copy_single(source, dest);
1362 }
1363
1364 static void
1365 lomac_ip6q_update(struct mbuf *m, struct label *mlabel, struct ip6q *q6,
1366 struct label *q6label)
1367 {
1368
1369 /* NOOP: we only accept matching labels, so no need to update */
1370 }
1371
1372 static void
1373 lomac_ipq_create(struct mbuf *m, struct label *mlabel, struct ipq *q,
1374 struct label *qlabel)
1375 {
1376 struct mac_lomac *source, *dest;
1377
1378 source = SLOT(mlabel);
1379 dest = SLOT(qlabel);
1380
1381 lomac_copy_single(source, dest);
1382 }
1383
1384 static int
1385 lomac_ipq_match(struct mbuf *m, struct label *mlabel, struct ipq *q,
1386 struct label *qlabel)
1387 {
1388 struct mac_lomac *a, *b;
1389
1390 a = SLOT(qlabel);
1391 b = SLOT(mlabel);
1392
1393 return (lomac_equal_single(a, b));
1394 }
1395
1396 static void
1397 lomac_ipq_reassemble(struct ipq *q, struct label *qlabel, struct mbuf *m,
1398 struct label *mlabel)
1399 {
1400 struct mac_lomac *source, *dest;
1401
1402 source = SLOT(qlabel);
1403 dest = SLOT(mlabel);
1404
1405 /* Just use the head, since we require them all to match. */
1406 lomac_copy_single(source, dest);
1407 }
1408
1409 static void
1410 lomac_ipq_update(struct mbuf *m, struct label *mlabel, struct ipq *q,
1411 struct label *qlabel)
1412 {
1413
1414 /* NOOP: we only accept matching labels, so no need to update */
1415 }
1416
1417 static int
1418 lomac_kld_check_load(struct ucred *cred, struct vnode *vp,
1419 struct label *vplabel)
1420 {
1421 struct mac_lomac *subj, *obj;
1422
1423 if (!lomac_enabled)
1424 return (0);
1425
1426 subj = SLOT(cred->cr_label);
1427 obj = SLOT(vplabel);
1428
1429 if (lomac_subject_privileged(subj))
1430 return (EPERM);
1431
1432 if (!lomac_high_single(obj))
1433 return (EACCES);
1434
1435 return (0);
1436 }
1437
1438 static void
1439 lomac_mount_create(struct ucred *cred, struct mount *mp,
1440 struct label *mplabel)
1441 {
1442 struct mac_lomac *source, *dest;
1443
1444 source = SLOT(cred->cr_label);
1445 dest = SLOT(mplabel);
1446 lomac_copy_single(source, dest);
1447 }
1448
1449 static void
1450 lomac_netatalk_aarp_send(struct ifnet *ifp, struct label *ifplabel,
1451 struct mbuf *m, struct label *mlabel)
1452 {
1453 struct mac_lomac *dest;
1454
1455 dest = SLOT(mlabel);
1456
1457 lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0);
1458 }
1459
1460 static void
1461 lomac_netinet_arp_send(struct ifnet *ifp, struct label *ifplabel,
1462 struct mbuf *m, struct label *mlabel)
1463 {
1464 struct mac_lomac *dest;
1465
1466 dest = SLOT(mlabel);
1467
1468 lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0);
1469 }
1470
1471 static void
1472 lomac_netinet_firewall_reply(struct mbuf *mrecv, struct label *mrecvlabel,
1473 struct mbuf *msend, struct label *msendlabel)
1474 {
1475 struct mac_lomac *source, *dest;
1476
1477 source = SLOT(mrecvlabel);
1478 dest = SLOT(msendlabel);
1479
1480 lomac_copy_single(source, dest);
1481 }
1482
1483 static void
1484 lomac_netinet_firewall_send(struct mbuf *m, struct label *mlabel)
1485 {
1486 struct mac_lomac *dest;
1487
1488 dest = SLOT(mlabel);
1489
1490 /* XXX: where is the label for the firewall really comming from? */
1491 lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0);
1492 }
1493
1494 static void
1495 lomac_netinet_fragment(struct mbuf *m, struct label *mlabel,
1496 struct mbuf *frag, struct label *fraglabel)
1497 {
1498 struct mac_lomac *source, *dest;
1499
1500 source = SLOT(mlabel);
1501 dest = SLOT(fraglabel);
1502
1503 lomac_copy_single(source, dest);
1504 }
1505
1506 static void
1507 lomac_netinet_icmp_reply(struct mbuf *mrecv, struct label *mrecvlabel,
1508 struct mbuf *msend, struct label *msendlabel)
1509 {
1510 struct mac_lomac *source, *dest;
1511
1512 source = SLOT(mrecvlabel);
1513 dest = SLOT(msendlabel);
1514
1515 lomac_copy_single(source, dest);
1516 }
1517
1518 static void
1519 lomac_netinet_igmp_send(struct ifnet *ifp, struct label *ifplabel,
1520 struct mbuf *m, struct label *mlabel)
1521 {
1522 struct mac_lomac *dest;
1523
1524 dest = SLOT(mlabel);
1525
1526 lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0);
1527 }
1528
1529 static void
1530 lomac_netinet6_nd6_send(struct ifnet *ifp, struct label *ifplabel,
1531 struct mbuf *m, struct label *mlabel)
1532 {
1533 struct mac_lomac *dest;
1534
1535 dest = SLOT(mlabel);
1536
1537 lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0);
1538 }
1539
1540 static int
1541 lomac_pipe_check_ioctl(struct ucred *cred, struct pipepair *pp,
1542 struct label *pplabel, unsigned long cmd, void /* caddr_t */ *data)
1543 {
1544
1545 if (!lomac_enabled)
1546 return (0);
1547
1548 /* XXX: This will be implemented soon... */
1549
1550 return (0);
1551 }
1552
1553 static int
1554 lomac_pipe_check_read(struct ucred *cred, struct pipepair *pp,
1555 struct label *pplabel)
1556 {
1557 struct mac_lomac *subj, *obj;
1558
1559 if (!lomac_enabled)
1560 return (0);
1561
1562 subj = SLOT(cred->cr_label);
1563 obj = SLOT(pplabel);
1564
1565 if (!lomac_dominate_single(obj, subj))
1566 return (maybe_demote(subj, obj, "reading", "pipe", NULL));
1567
1568 return (0);
1569 }
1570
1571 static int
1572 lomac_pipe_check_relabel(struct ucred *cred, struct pipepair *pp,
1573 struct label *pplabel, struct label *newlabel)
1574 {
1575 struct mac_lomac *subj, *obj, *new;
1576 int error;
1577
1578 new = SLOT(newlabel);
1579 subj = SLOT(cred->cr_label);
1580 obj = SLOT(pplabel);
1581
1582 /*
1583 * If there is a LOMAC label update for a pipe, it must be a single
1584 * update.
1585 */
1586 error = lomac_atmostflags(new, MAC_LOMAC_FLAG_SINGLE);
1587 if (error)
1588 return (error);
1589
1590 /*
1591 * To perform a relabel of a pipe (LOMAC label or not), LOMAC must
1592 * authorize the relabel.
1593 */
1594 if (!lomac_single_in_range(obj, subj))
1595 return (EPERM);
1596
1597 /*
1598 * If the LOMAC label is to be changed, authorize as appropriate.
1599 */
1600 if (new->ml_flags & MAC_LOMAC_FLAG_SINGLE) {
1601 /*
1602 * To change the LOMAC label on a pipe, the new pipe label
1603 * must be in the subject range.
1604 */
1605 if (!lomac_single_in_range(new, subj))
1606 return (EPERM);
1607
1608 /*
1609 * To change the LOMAC label on a pipe to be EQUAL, the
1610 * subject must have appropriate privilege.
1611 */
1612 if (lomac_contains_equal(new)) {
1613 error = lomac_subject_privileged(subj);
1614 if (error)
1615 return (error);
1616 }
1617 }
1618
1619 return (0);
1620 }
1621
1622 static int
1623 lomac_pipe_check_write(struct ucred *cred, struct pipepair *pp,
1624 struct label *pplabel)
1625 {
1626 struct mac_lomac *subj, *obj;
1627
1628 if (!lomac_enabled)
1629 return (0);
1630
1631 subj = SLOT(cred->cr_label);
1632 obj = SLOT(pplabel);
1633
1634 if (!lomac_subject_dominate(subj, obj))
1635 return (EACCES);
1636
1637 return (0);
1638 }
1639
1640 static void
1641 lomac_pipe_create(struct ucred *cred, struct pipepair *pp,
1642 struct label *pplabel)
1643 {
1644 struct mac_lomac *source, *dest;
1645
1646 source = SLOT(cred->cr_label);
1647 dest = SLOT(pplabel);
1648
1649 lomac_copy_single(source, dest);
1650 }
1651
1652 static void
1653 lomac_pipe_relabel(struct ucred *cred, struct pipepair *pp,
1654 struct label *pplabel, struct label *newlabel)
1655 {
1656 struct mac_lomac *source, *dest;
1657
1658 source = SLOT(newlabel);
1659 dest = SLOT(pplabel);
1660
1661 try_relabel(source, dest);
1662 }
1663
1664 /*
1665 * Some system privileges are allowed regardless of integrity grade; others
1666 * are allowed only when running with privilege with respect to the LOMAC
1667 * policy as they might otherwise allow bypassing of the integrity policy.
1668 */
1669 static int
1670 lomac_priv_check(struct ucred *cred, int priv)
1671 {
1672 struct mac_lomac *subj;
1673 int error;
1674
1675 if (!lomac_enabled)
1676 return (0);
1677
1678 /*
1679 * Exempt only specific privileges from the LOMAC integrity policy.
1680 */
1681 switch (priv) {
1682 case PRIV_KTRACE:
1683 case PRIV_MSGBUF:
1684
1685 /*
1686 * Allow processes to manipulate basic process audit properties, and
1687 * to submit audit records.
1688 */
1689 case PRIV_AUDIT_GETAUDIT:
1690 case PRIV_AUDIT_SETAUDIT:
1691 case PRIV_AUDIT_SUBMIT:
1692
1693 /*
1694 * Allow processes to manipulate their regular UNIX credentials.
1695 */
1696 case PRIV_CRED_SETUID:
1697 case PRIV_CRED_SETEUID:
1698 case PRIV_CRED_SETGID:
1699 case PRIV_CRED_SETEGID:
1700 case PRIV_CRED_SETGROUPS:
1701 case PRIV_CRED_SETREUID:
1702 case PRIV_CRED_SETREGID:
1703 case PRIV_CRED_SETRESUID:
1704 case PRIV_CRED_SETRESGID:
1705
1706 /*
1707 * Allow processes to perform system monitoring.
1708 */
1709 case PRIV_SEEOTHERGIDS:
1710 case PRIV_SEEOTHERUIDS:
1711 break;
1712
1713 /*
1714 * Allow access to general process debugging facilities. We
1715 * separately control debugging based on MAC label.
1716 */
1717 case PRIV_DEBUG_DIFFCRED:
1718 case PRIV_DEBUG_SUGID:
1719 case PRIV_DEBUG_UNPRIV:
1720
1721 /*
1722 * Allow manipulating jails.
1723 */
1724 case PRIV_JAIL_ATTACH:
1725
1726 /*
1727 * Allow privilege with respect to the Partition policy, but not the
1728 * Privs policy.
1729 */
1730 case PRIV_MAC_PARTITION:
1731
1732 /*
1733 * Allow privilege with respect to process resource limits and login
1734 * context.
1735 */
1736 case PRIV_PROC_LIMIT:
1737 case PRIV_PROC_SETLOGIN:
1738 case PRIV_PROC_SETRLIMIT:
1739
1740 /*
1741 * Allow System V and POSIX IPC privileges.
1742 */
1743 case PRIV_IPC_READ:
1744 case PRIV_IPC_WRITE:
1745 case PRIV_IPC_ADMIN:
1746 case PRIV_IPC_MSGSIZE:
1747 case PRIV_MQ_ADMIN:
1748
1749 /*
1750 * Allow certain scheduler manipulations -- possibly this should be
1751 * controlled by more fine-grained policy, as potentially low
1752 * integrity processes can deny CPU to higher integrity ones.
1753 */
1754 case PRIV_SCHED_DIFFCRED:
1755 case PRIV_SCHED_SETPRIORITY:
1756 case PRIV_SCHED_RTPRIO:
1757 case PRIV_SCHED_SETPOLICY:
1758 case PRIV_SCHED_SET:
1759 case PRIV_SCHED_SETPARAM:
1760
1761 /*
1762 * More IPC privileges.
1763 */
1764 case PRIV_SEM_WRITE:
1765
1766 /*
1767 * Allow signaling privileges subject to integrity policy.
1768 */
1769 case PRIV_SIGNAL_DIFFCRED:
1770 case PRIV_SIGNAL_SUGID:
1771
1772 /*
1773 * Allow access to only limited sysctls from lower integrity levels;
1774 * piggy-back on the Jail definition.
1775 */
1776 case PRIV_SYSCTL_WRITEJAIL:
1777
1778 /*
1779 * Allow TTY-based privileges, subject to general device access using
1780 * labels on TTY device nodes, but not console privilege.
1781 */
1782 case PRIV_TTY_DRAINWAIT:
1783 case PRIV_TTY_DTRWAIT:
1784 case PRIV_TTY_EXCLUSIVE:
1785 case PRIV_TTY_STI:
1786 case PRIV_TTY_SETA:
1787
1788 /*
1789 * Grant most VFS privileges, as almost all are in practice bounded
1790 * by more specific checks using labels.
1791 */
1792 case PRIV_VFS_READ:
1793 case PRIV_VFS_WRITE:
1794 case PRIV_VFS_ADMIN:
1795 case PRIV_VFS_EXEC:
1796 case PRIV_VFS_LOOKUP:
1797 case PRIV_VFS_CHFLAGS_DEV:
1798 case PRIV_VFS_CHOWN:
1799 case PRIV_VFS_CHROOT:
1800 case PRIV_VFS_RETAINSUGID:
1801 case PRIV_VFS_EXCEEDQUOTA:
1802 case PRIV_VFS_FCHROOT:
1803 case PRIV_VFS_FHOPEN:
1804 case PRIV_VFS_FHSTATFS:
1805 case PRIV_VFS_GENERATION:
1806 case PRIV_VFS_GETFH:
1807 case PRIV_VFS_GETQUOTA:
1808 case PRIV_VFS_LINK:
1809 case PRIV_VFS_MOUNT:
1810 case PRIV_VFS_MOUNT_OWNER:
1811 case PRIV_VFS_MOUNT_PERM:
1812 case PRIV_VFS_MOUNT_SUIDDIR:
1813 case PRIV_VFS_MOUNT_NONUSER:
1814 case PRIV_VFS_SETGID:
1815 case PRIV_VFS_STICKYFILE:
1816 case PRIV_VFS_SYSFLAGS:
1817 case PRIV_VFS_UNMOUNT:
1818
1819 /*
1820 * Allow VM privileges; it would be nice if these were subject to
1821 * resource limits.
1822 */
1823 case PRIV_VM_MADV_PROTECT:
1824 case PRIV_VM_MLOCK:
1825 case PRIV_VM_MUNLOCK:
1826 case PRIV_VM_SWAP_NOQUOTA:
1827 case PRIV_VM_SWAP_NORLIMIT:
1828
1829 /*
1830 * Allow some but not all network privileges. In general, dont allow
1831 * reconfiguring the network stack, just normal use.
1832 */
1833 case PRIV_NETATALK_RESERVEDPORT:
1834 case PRIV_NETINET_RESERVEDPORT:
1835 case PRIV_NETINET_RAW:
1836 case PRIV_NETINET_REUSEPORT:
1837 case PRIV_NETIPX_RESERVEDPORT:
1838 case PRIV_NETIPX_RAW:
1839 break;
1840
1841 /*
1842 * All remaining system privileges are allow only if the process
1843 * holds privilege with respect to the LOMAC policy.
1844 */
1845 default:
1846 subj = SLOT(cred->cr_label);
1847 error = lomac_subject_privileged(subj);
1848 if (error)
1849 return (error);
1850 }
1851 return (0);
1852 }
1853
1854 static int
1855 lomac_proc_check_debug(struct ucred *cred, struct proc *p)
1856 {
1857 struct mac_lomac *subj, *obj;
1858
1859 if (!lomac_enabled)
1860 return (0);
1861
1862 subj = SLOT(cred->cr_label);
1863 obj = SLOT(p->p_ucred->cr_label);
1864
1865 /* XXX: range checks */
1866 if (!lomac_dominate_single(obj, subj))
1867 return (ESRCH);
1868 if (!lomac_subject_dominate(subj, obj))
1869 return (EACCES);
1870
1871 return (0);
1872 }
1873
1874 static int
1875 lomac_proc_check_sched(struct ucred *cred, struct proc *p)
1876 {
1877 struct mac_lomac *subj, *obj;
1878
1879 if (!lomac_enabled)
1880 return (0);
1881
1882 subj = SLOT(cred->cr_label);
1883 obj = SLOT(p->p_ucred->cr_label);
1884
1885 /* XXX: range checks */
1886 if (!lomac_dominate_single(obj, subj))
1887 return (ESRCH);
1888 if (!lomac_subject_dominate(subj, obj))
1889 return (EACCES);
1890
1891 return (0);
1892 }
1893
1894 static int
1895 lomac_proc_check_signal(struct ucred *cred, struct proc *p, int signum)
1896 {
1897 struct mac_lomac *subj, *obj;
1898
1899 if (!lomac_enabled)
1900 return (0);
1901
1902 subj = SLOT(cred->cr_label);
1903 obj = SLOT(p->p_ucred->cr_label);
1904
1905 /* XXX: range checks */
1906 if (!lomac_dominate_single(obj, subj))
1907 return (ESRCH);
1908 if (!lomac_subject_dominate(subj, obj))
1909 return (EACCES);
1910
1911 return (0);
1912 }
1913
1914 static void
1915 lomac_proc_destroy_label(struct label *label)
1916 {
1917
1918 mtx_destroy(&PSLOT(label)->mtx);
1919 free(PSLOT(label), M_LOMAC);
1920 PSLOT_SET(label, NULL);
1921 }
1922
1923 static void
1924 lomac_proc_init_label(struct label *label)
1925 {
1926
1927 PSLOT_SET(label, malloc(sizeof(struct mac_lomac_proc), M_LOMAC,
1928 M_ZERO | M_WAITOK));
1929 mtx_init(&PSLOT(label)->mtx, "MAC/Lomac proc lock", NULL, MTX_DEF);
1930 }
1931
1932 static int
1933 lomac_socket_check_deliver(struct socket *so, struct label *solabel,
1934 struct mbuf *m, struct label *mlabel)
1935 {
1936 struct mac_lomac *p, *s;
1937 int error;
1938
1939 if (!lomac_enabled)
1940 return (0);
1941
1942 p = SLOT(mlabel);
1943 s = SLOT(solabel);
1944
1945 SOCK_LOCK(so);
1946 error = lomac_equal_single(p, s) ? 0 : EACCES;
1947 SOCK_UNLOCK(so);
1948 return (error);
1949 }
1950
1951 static int
1952 lomac_socket_check_relabel(struct ucred *cred, struct socket *so,
1953 struct label *solabel, struct label *newlabel)
1954 {
1955 struct mac_lomac *subj, *obj, *new;
1956 int error;
1957
1958 SOCK_LOCK_ASSERT(so);
1959
1960 new = SLOT(newlabel);
1961 subj = SLOT(cred->cr_label);
1962 obj = SLOT(solabel);
1963
1964 /*
1965 * If there is a LOMAC label update for the socket, it may be an
1966 * update of single.
1967 */
1968 error = lomac_atmostflags(new, MAC_LOMAC_FLAG_SINGLE);
1969 if (error)
1970 return (error);
1971
1972 /*
1973 * To relabel a socket, the old socket single must be in the subject
1974 * range.
1975 */
1976 if (!lomac_single_in_range(obj, subj))
1977 return (EPERM);
1978
1979 /*
1980 * If the LOMAC label is to be changed, authorize as appropriate.
1981 */
1982 if (new->ml_flags & MAC_LOMAC_FLAG_SINGLE) {
1983 /*
1984 * To relabel a socket, the new socket single must be in the
1985 * subject range.
1986 */
1987 if (!lomac_single_in_range(new, subj))
1988 return (EPERM);
1989
1990 /*
1991 * To change the LOMAC label on the socket to contain EQUAL,
1992 * the subject must have appropriate privilege.
1993 */
1994 if (lomac_contains_equal(new)) {
1995 error = lomac_subject_privileged(subj);
1996 if (error)
1997 return (error);
1998 }
1999 }
2000
2001 return (0);
2002 }
2003
2004 static int
2005 lomac_socket_check_visible(struct ucred *cred, struct socket *so,
2006 struct label *solabel)
2007 {
2008 struct mac_lomac *subj, *obj;
2009
2010 if (!lomac_enabled)
2011 return (0);
2012
2013 subj = SLOT(cred->cr_label);
2014 obj = SLOT(solabel);
2015
2016 SOCK_LOCK(so);
2017 if (!lomac_dominate_single(obj, subj)) {
2018 SOCK_UNLOCK(so);
2019 return (ENOENT);
2020 }
2021 SOCK_UNLOCK(so);
2022
2023 return (0);
2024 }
2025
2026 static void
2027 lomac_socket_create(struct ucred *cred, struct socket *so,
2028 struct label *solabel)
2029 {
2030 struct mac_lomac *source, *dest;
2031
2032 source = SLOT(cred->cr_label);
2033 dest = SLOT(solabel);
2034
2035 lomac_copy_single(source, dest);
2036 }
2037
2038 static void
2039 lomac_socket_create_mbuf(struct socket *so, struct label *solabel,
2040 struct mbuf *m, struct label *mlabel)
2041 {
2042 struct mac_lomac *source, *dest;
2043
2044 source = SLOT(solabel);
2045 dest = SLOT(mlabel);
2046
2047 SOCK_LOCK(so);
2048 lomac_copy_single(source, dest);
2049 SOCK_UNLOCK(so);
2050 }
2051
2052 static void
2053 lomac_socket_newconn(struct socket *oldso, struct label *oldsolabel,
2054 struct socket *newso, struct label *newsolabel)
2055 {
2056 struct mac_lomac source, *dest;
2057
2058 SOCK_LOCK(oldso);
2059 source = *SLOT(oldsolabel);
2060 SOCK_UNLOCK(oldso);
2061
2062 dest = SLOT(newsolabel);
2063
2064 SOCK_LOCK(newso);
2065 lomac_copy_single(&source, dest);
2066 SOCK_UNLOCK(newso);
2067 }
2068
2069 static void
2070 lomac_socket_relabel(struct ucred *cred, struct socket *so,
2071 struct label *solabel, struct label *newlabel)
2072 {
2073 struct mac_lomac *source, *dest;
2074
2075 SOCK_LOCK_ASSERT(so);
2076
2077 source = SLOT(newlabel);
2078 dest = SLOT(solabel);
2079
2080 try_relabel(source, dest);
2081 }
2082
2083 static void
2084 lomac_socketpeer_set_from_mbuf(struct mbuf *m, struct label *mlabel,
2085 struct socket *so, struct label *sopeerlabel)
2086 {
2087 struct mac_lomac *source, *dest;
2088
2089 source = SLOT(mlabel);
2090 dest = SLOT(sopeerlabel);
2091
2092 SOCK_LOCK(so);
2093 lomac_copy_single(source, dest);
2094 SOCK_UNLOCK(so);
2095 }
2096
2097 static void
2098 lomac_socketpeer_set_from_socket(struct socket *oldso,
2099 struct label *oldsolabel, struct socket *newso,
2100 struct label *newsopeerlabel)
2101 {
2102 struct mac_lomac source, *dest;
2103
2104 SOCK_LOCK(oldso);
2105 source = *SLOT(oldsolabel);
2106 SOCK_UNLOCK(oldso);
2107
2108 dest = SLOT(newsopeerlabel);
2109
2110 SOCK_LOCK(newso);
2111 lomac_copy_single(&source, dest);
2112 SOCK_UNLOCK(newso);
2113 }
2114
2115 static void
2116 lomac_syncache_create(struct label *label, struct inpcb *inp)
2117 {
2118 struct mac_lomac *source, *dest;
2119
2120 source = SLOT(inp->inp_label);
2121 dest = SLOT(label);
2122 lomac_copy(source, dest);
2123 }
2124
2125 static void
2126 lomac_syncache_create_mbuf(struct label *sc_label, struct mbuf *m,
2127 struct label *mlabel)
2128 {
2129 struct mac_lomac *source, *dest;
2130
2131 source = SLOT(sc_label);
2132 dest = SLOT(mlabel);
2133 lomac_copy(source, dest);
2134 }
2135
2136 static int
2137 lomac_system_check_acct(struct ucred *cred, struct vnode *vp,
2138 struct label *vplabel)
2139 {
2140 struct mac_lomac *subj, *obj;
2141
2142 if (!lomac_enabled)
2143 return (0);
2144
2145 subj = SLOT(cred->cr_label);
2146 obj = SLOT(vplabel);
2147
2148 if (lomac_subject_privileged(subj))
2149 return (EPERM);
2150
2151 if (!lomac_high_single(obj))
2152 return (EACCES);
2153
2154 return (0);
2155 }
2156
2157 static int
2158 lomac_system_check_auditctl(struct ucred *cred, struct vnode *vp,
2159 struct label *vplabel)
2160 {
2161 struct mac_lomac *subj, *obj;
2162
2163 if (!lomac_enabled)
2164 return (0);
2165
2166 subj = SLOT(cred->cr_label);
2167 obj = SLOT(vplabel);
2168
2169 if (lomac_subject_privileged(subj))
2170 return (EPERM);
2171
2172 if (!lomac_high_single(obj))
2173 return (EACCES);
2174
2175 return (0);
2176 }
2177
2178 static int
2179 lomac_system_check_swapoff(struct ucred *cred, struct vnode *vp,
2180 struct label *vplabel)
2181 {
2182 struct mac_lomac *subj;
2183
2184 if (!lomac_enabled)
2185 return (0);
2186
2187 subj = SLOT(cred->cr_label);
2188
2189 if (lomac_subject_privileged(subj))
2190 return (EPERM);
2191
2192 return (0);
2193 }
2194
2195 static int
2196 lomac_system_check_swapon(struct ucred *cred, struct vnode *vp,
2197 struct label *vplabel)
2198 {
2199 struct mac_lomac *subj, *obj;
2200
2201 if (!lomac_enabled)
2202 return (0);
2203
2204 subj = SLOT(cred->cr_label);
2205 obj = SLOT(vplabel);
2206
2207 if (lomac_subject_privileged(subj))
2208 return (EPERM);
2209
2210 if (!lomac_high_single(obj))
2211 return (EACCES);
2212
2213 return (0);
2214 }
2215
2216 static int
2217 lomac_system_check_sysctl(struct ucred *cred, struct sysctl_oid *oidp,
2218 void *arg1, int arg2, struct sysctl_req *req)
2219 {
2220 struct mac_lomac *subj;
2221
2222 if (!lomac_enabled)
2223 return (0);
2224
2225 subj = SLOT(cred->cr_label);
2226
2227 /*
2228 * Treat sysctl variables without CTLFLAG_ANYBODY flag as lomac/high,
2229 * but also require privilege to change them.
2230 */
2231 if (req->newptr != NULL && (oidp->oid_kind & CTLFLAG_ANYBODY) == 0) {
2232 #ifdef notdef
2233 if (!lomac_subject_dominate_high(subj))
2234 return (EACCES);
2235 #endif
2236
2237 if (lomac_subject_privileged(subj))
2238 return (EPERM);
2239 }
2240
2241 return (0);
2242 }
2243
2244 static void
2245 lomac_thread_userret(struct thread *td)
2246 {
2247 struct proc *p = td->td_proc;
2248 struct mac_lomac_proc *subj = PSLOT(p->p_label);
2249 struct ucred *newcred, *oldcred;
2250 int dodrop;
2251
2252 mtx_lock(&subj->mtx);
2253 if (subj->mac_lomac.ml_flags & MAC_LOMAC_FLAG_UPDATE) {
2254 dodrop = 0;
2255 mtx_unlock(&subj->mtx);
2256 newcred = crget();
2257 /*
2258 * Prevent a lock order reversal in mac_proc_vm_revoke;
2259 * ideally, the other user of subj->mtx wouldn't be holding
2260 * Giant.
2261 */
2262 mtx_lock(&Giant);
2263 PROC_LOCK(p);
2264 mtx_lock(&subj->mtx);
2265 /*
2266 * Check if we lost the race while allocating the cred.
2267 */
2268 if ((subj->mac_lomac.ml_flags & MAC_LOMAC_FLAG_UPDATE) == 0) {
2269 crfree(newcred);
2270 goto out;
2271 }
2272 oldcred = p->p_ucred;
2273 crcopy(newcred, oldcred);
2274 crhold(newcred);
2275 lomac_copy(&subj->mac_lomac, SLOT(newcred->cr_label));
2276 p->p_ucred = newcred;
2277 crfree(oldcred);
2278 dodrop = 1;
2279 out:
2280 mtx_unlock(&subj->mtx);
2281 PROC_UNLOCK(p);
2282 if (dodrop)
2283 mac_proc_vm_revoke(curthread);
2284 mtx_unlock(&Giant);
2285 } else {
2286 mtx_unlock(&subj->mtx);
2287 }
2288 }
2289
2290 static int
2291 lomac_vnode_associate_extattr(struct mount *mp, struct label *mplabel,
2292 struct vnode *vp, struct label *vplabel)
2293 {
2294 struct mac_lomac ml_temp, *source, *dest;
2295 int buflen, error;
2296
2297 source = SLOT(mplabel);
2298 dest = SLOT(vplabel);
2299
2300 buflen = sizeof(ml_temp);
2301 bzero(&ml_temp, buflen);
2302
2303 error = vn_extattr_get(vp, IO_NODELOCKED, MAC_LOMAC_EXTATTR_NAMESPACE,
2304 MAC_LOMAC_EXTATTR_NAME, &buflen, (char *)&ml_temp, curthread);
2305 if (error == ENOATTR || error == EOPNOTSUPP) {
2306 /* Fall back to the mntlabel. */
2307 lomac_copy_single(source, dest);
2308 return (0);
2309 } else if (error)
2310 return (error);
2311
2312 if (buflen != sizeof(ml_temp)) {
2313 if (buflen != sizeof(ml_temp) - sizeof(ml_temp.ml_auxsingle)) {
2314 printf("lomac_vnode_associate_extattr: bad size %d\n",
2315 buflen);
2316 return (EPERM);
2317 }
2318 bzero(&ml_temp.ml_auxsingle, sizeof(ml_temp.ml_auxsingle));
2319 buflen = sizeof(ml_temp);
2320 (void)vn_extattr_set(vp, IO_NODELOCKED,
2321 MAC_LOMAC_EXTATTR_NAMESPACE, MAC_LOMAC_EXTATTR_NAME,
2322 buflen, (char *)&ml_temp, curthread);
2323 }
2324 if (lomac_valid(&ml_temp) != 0) {
2325 printf("lomac_vnode_associate_extattr: invalid\n");
2326 return (EPERM);
2327 }
2328 if ((ml_temp.ml_flags & MAC_LOMAC_FLAGS_BOTH) !=
2329 MAC_LOMAC_FLAG_SINGLE) {
2330 printf("lomac_vnode_associate_extattr: not single\n");
2331 return (EPERM);
2332 }
2333
2334 lomac_copy_single(&ml_temp, dest);
2335 return (0);
2336 }
2337
2338 static void
2339 lomac_vnode_associate_singlelabel(struct mount *mp, struct label *mplabel,
2340 struct vnode *vp, struct label *vplabel)
2341 {
2342 struct mac_lomac *source, *dest;
2343
2344 source = SLOT(mplabel);
2345 dest = SLOT(vplabel);
2346
2347 lomac_copy_single(source, dest);
2348 }
2349
2350 static int
2351 lomac_vnode_check_create(struct ucred *cred, struct vnode *dvp,
2352 struct label *dvplabel, struct componentname *cnp, struct vattr *vap)
2353 {
2354 struct mac_lomac *subj, *obj;
2355
2356 if (!lomac_enabled)
2357 return (0);
2358
2359 subj = SLOT(cred->cr_label);
2360 obj = SLOT(dvplabel);
2361
2362 if (!lomac_subject_dominate(subj, obj))
2363 return (EACCES);
2364 if (obj->ml_flags & MAC_LOMAC_FLAG_AUX &&
2365 !lomac_dominate_element(&subj->ml_single, &obj->ml_auxsingle))
2366 return (EACCES);
2367
2368 return (0);
2369 }
2370
2371 static int
2372 lomac_vnode_check_deleteacl(struct ucred *cred, struct vnode *vp,
2373 struct label *vplabel, acl_type_t type)
2374 {
2375 struct mac_lomac *subj, *obj;
2376
2377 if (!lomac_enabled)
2378 return (0);
2379
2380 subj = SLOT(cred->cr_label);
2381 obj = SLOT(vplabel);
2382
2383 if (!lomac_subject_dominate(subj, obj))
2384 return (EACCES);
2385
2386 return (0);
2387 }
2388
2389 static int
2390 lomac_vnode_check_link(struct ucred *cred, struct vnode *dvp,
2391 struct label *dvplabel, struct vnode *vp, struct label *vplabel,
2392 struct componentname *cnp)
2393 {
2394 struct mac_lomac *subj, *obj;
2395
2396 if (!lomac_enabled)
2397 return (0);
2398
2399 subj = SLOT(cred->cr_label);
2400 obj = SLOT(dvplabel);
2401
2402 if (!lomac_subject_dominate(subj, obj))
2403 return (EACCES);
2404
2405 obj = SLOT(vplabel);
2406
2407 if (!lomac_subject_dominate(subj, obj))
2408 return (EACCES);
2409
2410 return (0);
2411 }
2412
2413 static int
2414 lomac_vnode_check_mmap(struct ucred *cred, struct vnode *vp,
2415 struct label *vplabel, int prot, int flags)
2416 {
2417 struct mac_lomac *subj, *obj;
2418
2419 /*
2420 * Rely on the use of open()-time protections to handle
2421 * non-revocation cases.
2422 */
2423 if (!lomac_enabled)
2424 return (0);
2425
2426 subj = SLOT(cred->cr_label);
2427 obj = SLOT(vplabel);
2428
2429 if (((prot & VM_PROT_WRITE) != 0) && ((flags & MAP_SHARED) != 0)) {
2430 if (!lomac_subject_dominate(subj, obj))
2431 return (EACCES);
2432 }
2433 if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) {
2434 if (!lomac_dominate_single(obj, subj))
2435 return (maybe_demote(subj, obj, "mapping", "file", vp));
2436 }
2437
2438 return (0);
2439 }
2440
2441 static void
2442 lomac_vnode_check_mmap_downgrade(struct ucred *cred, struct vnode *vp,
2443 struct label *vplabel, /* XXX vm_prot_t */ int *prot)
2444 {
2445 struct mac_lomac *subj, *obj;
2446
2447 /*
2448 * Rely on the use of open()-time protections to handle
2449 * non-revocation cases.
2450 */
2451 if (!lomac_enabled || !revocation_enabled)
2452 return;
2453
2454 subj = SLOT(cred->cr_label);
2455 obj = SLOT(vplabel);
2456
2457 if (!lomac_subject_dominate(subj, obj))
2458 *prot &= ~VM_PROT_WRITE;
2459 }
2460
2461 static int
2462 lomac_vnode_check_open(struct ucred *cred, struct vnode *vp,
2463 struct label *vplabel, accmode_t accmode)
2464 {
2465 struct mac_lomac *subj, *obj;
2466
2467 if (!lomac_enabled)
2468 return (0);
2469
2470 subj = SLOT(cred->cr_label);
2471 obj = SLOT(vplabel);
2472
2473 /* XXX privilege override for admin? */
2474 if (accmode & VMODIFY_PERMS) {
2475 if (!lomac_subject_dominate(subj, obj))
2476 return (EACCES);
2477 }
2478
2479 return (0);
2480 }
2481
2482 static int
2483 lomac_vnode_check_read(struct ucred *active_cred, struct ucred *file_cred,
2484 struct vnode *vp, struct label *vplabel)
2485 {
2486 struct mac_lomac *subj, *obj;
2487
2488 if (!lomac_enabled || !revocation_enabled)
2489 return (0);
2490
2491 subj = SLOT(active_cred->cr_label);
2492 obj = SLOT(vplabel);
2493
2494 if (!lomac_dominate_single(obj, subj))
2495 return (maybe_demote(subj, obj, "reading", "file", vp));
2496
2497 return (0);
2498 }
2499
2500 static int
2501 lomac_vnode_check_relabel(struct ucred *cred, struct vnode *vp,
2502 struct label *vplabel, struct label *newlabel)
2503 {
2504 struct mac_lomac *old, *new, *subj;
2505 int error;
2506
2507 old = SLOT(vplabel);
2508 new = SLOT(newlabel);
2509 subj = SLOT(cred->cr_label);
2510
2511 /*
2512 * If there is a LOMAC label update for the vnode, it must be a
2513 * single label, with an optional explicit auxiliary single.
2514 */
2515 error = lomac_atmostflags(new,
2516 MAC_LOMAC_FLAG_SINGLE | MAC_LOMAC_FLAG_AUX);
2517 if (error)
2518 return (error);
2519
2520 /*
2521 * To perform a relabel of the vnode (LOMAC label or not), LOMAC must
2522 * authorize the relabel.
2523 */
2524 if (!lomac_single_in_range(old, subj))
2525 return (EPERM);
2526
2527 /*
2528 * If the LOMAC label is to be changed, authorize as appropriate.
2529 */
2530 if (new->ml_flags & MAC_LOMAC_FLAG_SINGLE) {
2531 /*
2532 * To change the LOMAC label on a vnode, the new vnode label
2533 * must be in the subject range.
2534 */
2535 if (!lomac_single_in_range(new, subj))
2536 return (EPERM);
2537
2538 /*
2539 * To change the LOMAC label on the vnode to be EQUAL, the
2540 * subject must have appropriate privilege.
2541 */
2542 if (lomac_contains_equal(new)) {
2543 error = lomac_subject_privileged(subj);
2544 if (error)
2545 return (error);
2546 }
2547 }
2548 if (new->ml_flags & MAC_LOMAC_FLAG_AUX) {
2549 /*
2550 * Fill in the missing parts from the previous label.
2551 */
2552 if ((new->ml_flags & MAC_LOMAC_FLAG_SINGLE) == 0)
2553 lomac_copy_single(subj, new);
2554
2555 /*
2556 * To change the auxiliary LOMAC label on a vnode, the new
2557 * vnode label must be in the subject range.
2558 */
2559 if (!lomac_auxsingle_in_range(new, subj))
2560 return (EPERM);
2561
2562 /*
2563 * To change the auxiliary LOMAC label on the vnode to be
2564 * EQUAL, the subject must have appropriate privilege.
2565 */
2566 if (lomac_contains_equal(new)) {
2567 error = lomac_subject_privileged(subj);
2568 if (error)
2569 return (error);
2570 }
2571 }
2572
2573 return (0);
2574 }
2575
2576 static int
2577 lomac_vnode_check_rename_from(struct ucred *cred, struct vnode *dvp,
2578 struct label *dvplabel, struct vnode *vp, struct label *vplabel,
2579 struct componentname *cnp)
2580 {
2581 struct mac_lomac *subj, *obj;
2582
2583 if (!lomac_enabled)
2584 return (0);
2585
2586 subj = SLOT(cred->cr_label);
2587 obj = SLOT(dvplabel);
2588
2589 if (!lomac_subject_dominate(subj, obj))
2590 return (EACCES);
2591
2592 obj = SLOT(vplabel);
2593
2594 if (!lomac_subject_dominate(subj, obj))
2595 return (EACCES);
2596
2597 return (0);
2598 }
2599
2600 static int
2601 lomac_vnode_check_rename_to(struct ucred *cred, struct vnode *dvp,
2602 struct label *dvplabel, struct vnode *vp, struct label *vplabel,
2603 int samedir, struct componentname *cnp)
2604 {
2605 struct mac_lomac *subj, *obj;
2606
2607 if (!lomac_enabled)
2608 return (0);
2609
2610 subj = SLOT(cred->cr_label);
2611 obj = SLOT(dvplabel);
2612
2613 if (!lomac_subject_dominate(subj, obj))
2614 return (EACCES);
2615
2616 if (vp != NULL) {
2617 obj = SLOT(vplabel);
2618
2619 if (!lomac_subject_dominate(subj, obj))
2620 return (EACCES);
2621 }
2622
2623 return (0);
2624 }
2625
2626 static int
2627 lomac_vnode_check_revoke(struct ucred *cred, struct vnode *vp,
2628 struct label *vplabel)
2629 {
2630 struct mac_lomac *subj, *obj;
2631
2632 if (!lomac_enabled)
2633 return (0);
2634
2635 subj = SLOT(cred->cr_label);
2636 obj = SLOT(vplabel);
2637
2638 if (!lomac_subject_dominate(subj, obj))
2639 return (EACCES);
2640
2641 return (0);
2642 }
2643
2644 static int
2645 lomac_vnode_check_setacl(struct ucred *cred, struct vnode *vp,
2646 struct label *vplabel, acl_type_t type, struct acl *acl)
2647 {
2648 struct mac_lomac *subj, *obj;
2649
2650 if (!lomac_enabled)
2651 return (0);
2652
2653 subj = SLOT(cred->cr_label);
2654 obj = SLOT(vplabel);
2655
2656 if (!lomac_subject_dominate(subj, obj))
2657 return (EACCES);
2658
2659 return (0);
2660 }
2661
2662 static int
2663 lomac_vnode_check_setextattr(struct ucred *cred, struct vnode *vp,
2664 struct label *vplabel, int attrnamespace, const char *name)
2665 {
2666 struct mac_lomac *subj, *obj;
2667
2668 if (!lomac_enabled)
2669 return (0);
2670
2671 subj = SLOT(cred->cr_label);
2672 obj = SLOT(vplabel);
2673
2674 if (!lomac_subject_dominate(subj, obj))
2675 return (EACCES);
2676
2677 /* XXX: protect the MAC EA in a special way? */
2678
2679 return (0);
2680 }
2681
2682 static int
2683 lomac_vnode_check_setflags(struct ucred *cred, struct vnode *vp,
2684 struct label *vplabel, u_long flags)
2685 {
2686 struct mac_lomac *subj, *obj;
2687
2688 if (!lomac_enabled)
2689 return (0);
2690
2691 subj = SLOT(cred->cr_label);
2692 obj = SLOT(vplabel);
2693
2694 if (!lomac_subject_dominate(subj, obj))
2695 return (EACCES);
2696
2697 return (0);
2698 }
2699
2700 static int
2701 lomac_vnode_check_setmode(struct ucred *cred, struct vnode *vp,
2702 struct label *vplabel, mode_t mode)
2703 {
2704 struct mac_lomac *subj, *obj;
2705
2706 if (!lomac_enabled)
2707 return (0);
2708
2709 subj = SLOT(cred->cr_label);
2710 obj = SLOT(vplabel);
2711
2712 if (!lomac_subject_dominate(subj, obj))
2713 return (EACCES);
2714
2715 return (0);
2716 }
2717
2718 static int
2719 lomac_vnode_check_setowner(struct ucred *cred, struct vnode *vp,
2720 struct label *vplabel, uid_t uid, gid_t gid)
2721 {
2722 struct mac_lomac *subj, *obj;
2723
2724 if (!lomac_enabled)
2725 return (0);
2726
2727 subj = SLOT(cred->cr_label);
2728 obj = SLOT(vplabel);
2729
2730 if (!lomac_subject_dominate(subj, obj))
2731 return (EACCES);
2732
2733 return (0);
2734 }
2735
2736 static int
2737 lomac_vnode_check_setutimes(struct ucred *cred, struct vnode *vp,
2738 struct label *vplabel, struct timespec atime, struct timespec mtime)
2739 {
2740 struct mac_lomac *subj, *obj;
2741
2742 if (!lomac_enabled)
2743 return (0);
2744
2745 subj = SLOT(cred->cr_label);
2746 obj = SLOT(vplabel);
2747
2748 if (!lomac_subject_dominate(subj, obj))
2749 return (EACCES);
2750
2751 return (0);
2752 }
2753
2754 static int
2755 lomac_vnode_check_unlink(struct ucred *cred, struct vnode *dvp,
2756 struct label *dvplabel, struct vnode *vp, struct label *vplabel,
2757 struct componentname *cnp)
2758 {
2759 struct mac_lomac *subj, *obj;
2760
2761 if (!lomac_enabled)
2762 return (0);
2763
2764 subj = SLOT(cred->cr_label);
2765 obj = SLOT(dvplabel);
2766
2767 if (!lomac_subject_dominate(subj, obj))
2768 return (EACCES);
2769
2770 obj = SLOT(vplabel);
2771
2772 if (!lomac_subject_dominate(subj, obj))
2773 return (EACCES);
2774
2775 return (0);
2776 }
2777
2778 static int
2779 lomac_vnode_check_write(struct ucred *active_cred,
2780 struct ucred *file_cred, struct vnode *vp, struct label *vplabel)
2781 {
2782 struct mac_lomac *subj, *obj;
2783
2784 if (!lomac_enabled || !revocation_enabled)
2785 return (0);
2786
2787 subj = SLOT(active_cred->cr_label);
2788 obj = SLOT(vplabel);
2789
2790 if (!lomac_subject_dominate(subj, obj))
2791 return (EACCES);
2792
2793 return (0);
2794 }
2795
2796 static int
2797 lomac_vnode_create_extattr(struct ucred *cred, struct mount *mp,
2798 struct label *mplabel, struct vnode *dvp, struct label *dvplabel,
2799 struct vnode *vp, struct label *vplabel, struct componentname *cnp)
2800 {
2801 struct mac_lomac *source, *dest, *dir, temp;
2802 size_t buflen;
2803 int error;
2804
2805 buflen = sizeof(temp);
2806 bzero(&temp, buflen);
2807
2808 source = SLOT(cred->cr_label);
2809 dest = SLOT(vplabel);
2810 dir = SLOT(dvplabel);
2811 if (dir->ml_flags & MAC_LOMAC_FLAG_AUX) {
2812 lomac_copy_auxsingle(dir, &temp);
2813 lomac_set_single(&temp, dir->ml_auxsingle.mle_type,
2814 dir->ml_auxsingle.mle_grade);
2815 } else {
2816 lomac_copy_single(source, &temp);
2817 }
2818
2819 error = vn_extattr_set(vp, IO_NODELOCKED, MAC_LOMAC_EXTATTR_NAMESPACE,
2820 MAC_LOMAC_EXTATTR_NAME, buflen, (char *)&temp, curthread);
2821 if (error == 0)
2822 lomac_copy(&temp, dest);
2823 return (error);
2824 }
2825
2826 static void
2827 lomac_vnode_execve_transition(struct ucred *old, struct ucred *new,
2828 struct vnode *vp, struct label *vplabel, struct label *interpvplabel,
2829 struct image_params *imgp, struct label *execlabel)
2830 {
2831 struct mac_lomac *source, *dest, *obj, *robj;
2832
2833 source = SLOT(old->cr_label);
2834 dest = SLOT(new->cr_label);
2835 obj = SLOT(vplabel);
2836 robj = interpvplabel != NULL ? SLOT(interpvplabel) : obj;
2837
2838 lomac_copy(source, dest);
2839 /*
2840 * If there's an auxiliary label on the real object, respect it and
2841 * assume that this level should be assumed immediately if a higher
2842 * level is currently in place.
2843 */
2844 if (robj->ml_flags & MAC_LOMAC_FLAG_AUX &&
2845 !lomac_dominate_element(&robj->ml_auxsingle, &dest->ml_single)
2846 && lomac_auxsingle_in_range(robj, dest))
2847 lomac_set_single(dest, robj->ml_auxsingle.mle_type,
2848 robj->ml_auxsingle.mle_grade);
2849 /*
2850 * Restructuring to use the execve transitioning mechanism instead of
2851 * the normal demotion mechanism here would be difficult, so just
2852 * copy the label over and perform standard demotion. This is also
2853 * non-optimal because it will result in the intermediate label "new"
2854 * being created and immediately recycled.
2855 */
2856 if (lomac_enabled && revocation_enabled &&
2857 !lomac_dominate_single(obj, source))
2858 (void)maybe_demote(source, obj, "executing", "file", vp);
2859 }
2860
2861 static int
2862 lomac_vnode_execve_will_transition(struct ucred *old, struct vnode *vp,
2863 struct label *vplabel, struct label *interpvplabel,
2864 struct image_params *imgp, struct label *execlabel)
2865 {
2866 struct mac_lomac *subj, *obj, *robj;
2867
2868 if (!lomac_enabled || !revocation_enabled)
2869 return (0);
2870
2871 subj = SLOT(old->cr_label);
2872 obj = SLOT(vplabel);
2873 robj = interpvplabel != NULL ? SLOT(interpvplabel) : obj;
2874
2875 return ((robj->ml_flags & MAC_LOMAC_FLAG_AUX &&
2876 !lomac_dominate_element(&robj->ml_auxsingle, &subj->ml_single)
2877 && lomac_auxsingle_in_range(robj, subj)) ||
2878 !lomac_dominate_single(obj, subj));
2879 }
2880
2881 static void
2882 lomac_vnode_relabel(struct ucred *cred, struct vnode *vp,
2883 struct label *vplabel, struct label *newlabel)
2884 {
2885 struct mac_lomac *source, *dest;
2886
2887 source = SLOT(newlabel);
2888 dest = SLOT(vplabel);
2889
2890 try_relabel(source, dest);
2891 }
2892
2893 static int
2894 lomac_vnode_setlabel_extattr(struct ucred *cred, struct vnode *vp,
2895 struct label *vplabel, struct label *intlabel)
2896 {
2897 struct mac_lomac *source, temp;
2898 size_t buflen;
2899 int error;
2900
2901 buflen = sizeof(temp);
2902 bzero(&temp, buflen);
2903
2904 source = SLOT(intlabel);
2905 if ((source->ml_flags & MAC_LOMAC_FLAG_SINGLE) == 0)
2906 return (0);
2907
2908 lomac_copy_single(source, &temp);
2909 error = vn_extattr_set(vp, IO_NODELOCKED, MAC_LOMAC_EXTATTR_NAMESPACE,
2910 MAC_LOMAC_EXTATTR_NAME, buflen, (char *)&temp, curthread);
2911 return (error);
2912 }
2913
2914 static struct mac_policy_ops lomac_ops =
2915 {
2916 .mpo_init = lomac_init,
2917
2918 .mpo_bpfdesc_check_receive = lomac_bpfdesc_check_receive,
2919 .mpo_bpfdesc_create = lomac_bpfdesc_create,
2920 .mpo_bpfdesc_create_mbuf = lomac_bpfdesc_create_mbuf,
2921 .mpo_bpfdesc_destroy_label = lomac_destroy_label,
2922 .mpo_bpfdesc_init_label = lomac_init_label,
2923
2924 .mpo_cred_check_relabel = lomac_cred_check_relabel,
2925 .mpo_cred_check_visible = lomac_cred_check_visible,
2926 .mpo_cred_copy_label = lomac_copy_label,
2927 .mpo_cred_create_swapper = lomac_cred_create_swapper,
2928 .mpo_cred_create_init = lomac_cred_create_init,
2929 .mpo_cred_destroy_label = lomac_destroy_label,
2930 .mpo_cred_externalize_label = lomac_externalize_label,
2931 .mpo_cred_init_label = lomac_init_label,
2932 .mpo_cred_internalize_label = lomac_internalize_label,
2933 .mpo_cred_relabel = lomac_cred_relabel,
2934
2935 .mpo_devfs_create_device = lomac_devfs_create_device,
2936 .mpo_devfs_create_directory = lomac_devfs_create_directory,
2937 .mpo_devfs_create_symlink = lomac_devfs_create_symlink,
2938 .mpo_devfs_destroy_label = lomac_destroy_label,
2939 .mpo_devfs_init_label = lomac_init_label,
2940 .mpo_devfs_update = lomac_devfs_update,
2941 .mpo_devfs_vnode_associate = lomac_devfs_vnode_associate,
2942
2943 .mpo_ifnet_check_relabel = lomac_ifnet_check_relabel,
2944 .mpo_ifnet_check_transmit = lomac_ifnet_check_transmit,
2945 .mpo_ifnet_copy_label = lomac_copy_label,
2946 .mpo_ifnet_create = lomac_ifnet_create,
2947 .mpo_ifnet_create_mbuf = lomac_ifnet_create_mbuf,
2948 .mpo_ifnet_destroy_label = lomac_destroy_label,
2949 .mpo_ifnet_externalize_label = lomac_externalize_label,
2950 .mpo_ifnet_init_label = lomac_init_label,
2951 .mpo_ifnet_internalize_label = lomac_internalize_label,
2952 .mpo_ifnet_relabel = lomac_ifnet_relabel,
2953
2954 .mpo_syncache_create = lomac_syncache_create,
2955 .mpo_syncache_destroy_label = lomac_destroy_label,
2956 .mpo_syncache_init_label = lomac_init_label_waitcheck,
2957
2958 .mpo_inpcb_check_deliver = lomac_inpcb_check_deliver,
2959 .mpo_inpcb_check_visible = lomac_inpcb_check_visible,
2960 .mpo_inpcb_create = lomac_inpcb_create,
2961 .mpo_inpcb_create_mbuf = lomac_inpcb_create_mbuf,
2962 .mpo_inpcb_destroy_label = lomac_destroy_label,
2963 .mpo_inpcb_init_label = lomac_init_label_waitcheck,
2964 .mpo_inpcb_sosetlabel = lomac_inpcb_sosetlabel,
2965
2966 .mpo_ip6q_create = lomac_ip6q_create,
2967 .mpo_ip6q_destroy_label = lomac_destroy_label,
2968 .mpo_ip6q_init_label = lomac_init_label_waitcheck,
2969 .mpo_ip6q_match = lomac_ip6q_match,
2970 .mpo_ip6q_reassemble = lomac_ip6q_reassemble,
2971 .mpo_ip6q_update = lomac_ip6q_update,
2972
2973 .mpo_ipq_create = lomac_ipq_create,
2974 .mpo_ipq_destroy_label = lomac_destroy_label,
2975 .mpo_ipq_init_label = lomac_init_label_waitcheck,
2976 .mpo_ipq_match = lomac_ipq_match,
2977 .mpo_ipq_reassemble = lomac_ipq_reassemble,
2978 .mpo_ipq_update = lomac_ipq_update,
2979
2980 .mpo_kld_check_load = lomac_kld_check_load,
2981
2982 .mpo_mbuf_copy_label = lomac_copy_label,
2983 .mpo_mbuf_destroy_label = lomac_destroy_label,
2984 .mpo_mbuf_init_label = lomac_init_label_waitcheck,
2985
2986 .mpo_mount_create = lomac_mount_create,
2987 .mpo_mount_destroy_label = lomac_destroy_label,
2988 .mpo_mount_init_label = lomac_init_label,
2989
2990 .mpo_netatalk_aarp_send = lomac_netatalk_aarp_send,
2991
2992 .mpo_netinet_arp_send = lomac_netinet_arp_send,
2993 .mpo_netinet_firewall_reply = lomac_netinet_firewall_reply,
2994 .mpo_netinet_firewall_send = lomac_netinet_firewall_send,
2995 .mpo_netinet_fragment = lomac_netinet_fragment,
2996 .mpo_netinet_icmp_reply = lomac_netinet_icmp_reply,
2997 .mpo_netinet_igmp_send = lomac_netinet_igmp_send,
2998
2999 .mpo_netinet6_nd6_send = lomac_netinet6_nd6_send,
3000
3001 .mpo_pipe_check_ioctl = lomac_pipe_check_ioctl,
3002 .mpo_pipe_check_read = lomac_pipe_check_read,
3003 .mpo_pipe_check_relabel = lomac_pipe_check_relabel,
3004 .mpo_pipe_check_write = lomac_pipe_check_write,
3005 .mpo_pipe_copy_label = lomac_copy_label,
3006 .mpo_pipe_create = lomac_pipe_create,
3007 .mpo_pipe_destroy_label = lomac_destroy_label,
3008 .mpo_pipe_externalize_label = lomac_externalize_label,
3009 .mpo_pipe_init_label = lomac_init_label,
3010 .mpo_pipe_internalize_label = lomac_internalize_label,
3011 .mpo_pipe_relabel = lomac_pipe_relabel,
3012
3013 .mpo_priv_check = lomac_priv_check,
3014
3015 .mpo_proc_check_debug = lomac_proc_check_debug,
3016 .mpo_proc_check_sched = lomac_proc_check_sched,
3017 .mpo_proc_check_signal = lomac_proc_check_signal,
3018 .mpo_proc_destroy_label = lomac_proc_destroy_label,
3019 .mpo_proc_init_label = lomac_proc_init_label,
3020
3021 .mpo_socket_check_deliver = lomac_socket_check_deliver,
3022 .mpo_socket_check_relabel = lomac_socket_check_relabel,
3023 .mpo_socket_check_visible = lomac_socket_check_visible,
3024 .mpo_socket_copy_label = lomac_copy_label,
3025 .mpo_socket_create = lomac_socket_create,
3026 .mpo_socket_create_mbuf = lomac_socket_create_mbuf,
3027 .mpo_socket_destroy_label = lomac_destroy_label,
3028 .mpo_socket_externalize_label = lomac_externalize_label,
3029 .mpo_socket_init_label = lomac_init_label_waitcheck,
3030 .mpo_socket_internalize_label = lomac_internalize_label,
3031 .mpo_socket_newconn = lomac_socket_newconn,
3032 .mpo_socket_relabel = lomac_socket_relabel,
3033
3034 .mpo_socketpeer_destroy_label = lomac_destroy_label,
3035 .mpo_socketpeer_externalize_label = lomac_externalize_label,
3036 .mpo_socketpeer_init_label = lomac_init_label_waitcheck,
3037 .mpo_socketpeer_set_from_mbuf = lomac_socketpeer_set_from_mbuf,
3038 .mpo_socketpeer_set_from_socket = lomac_socketpeer_set_from_socket,
3039
3040 .mpo_syncache_create_mbuf = lomac_syncache_create_mbuf,
3041
3042 .mpo_system_check_acct = lomac_system_check_acct,
3043 .mpo_system_check_auditctl = lomac_system_check_auditctl,
3044 .mpo_system_check_swapoff = lomac_system_check_swapoff,
3045 .mpo_system_check_swapon = lomac_system_check_swapon,
3046 .mpo_system_check_sysctl = lomac_system_check_sysctl,
3047
3048 .mpo_thread_userret = lomac_thread_userret,
3049
3050 .mpo_vnode_associate_extattr = lomac_vnode_associate_extattr,
3051 .mpo_vnode_associate_singlelabel = lomac_vnode_associate_singlelabel,
3052 .mpo_vnode_check_access = lomac_vnode_check_open,
3053 .mpo_vnode_check_create = lomac_vnode_check_create,
3054 .mpo_vnode_check_deleteacl = lomac_vnode_check_deleteacl,
3055 .mpo_vnode_check_link = lomac_vnode_check_link,
3056 .mpo_vnode_check_mmap = lomac_vnode_check_mmap,
3057 .mpo_vnode_check_mmap_downgrade = lomac_vnode_check_mmap_downgrade,
3058 .mpo_vnode_check_open = lomac_vnode_check_open,
3059 .mpo_vnode_check_read = lomac_vnode_check_read,
3060 .mpo_vnode_check_relabel = lomac_vnode_check_relabel,
3061 .mpo_vnode_check_rename_from = lomac_vnode_check_rename_from,
3062 .mpo_vnode_check_rename_to = lomac_vnode_check_rename_to,
3063 .mpo_vnode_check_revoke = lomac_vnode_check_revoke,
3064 .mpo_vnode_check_setacl = lomac_vnode_check_setacl,
3065 .mpo_vnode_check_setextattr = lomac_vnode_check_setextattr,
3066 .mpo_vnode_check_setflags = lomac_vnode_check_setflags,
3067 .mpo_vnode_check_setmode = lomac_vnode_check_setmode,
3068 .mpo_vnode_check_setowner = lomac_vnode_check_setowner,
3069 .mpo_vnode_check_setutimes = lomac_vnode_check_setutimes,
3070 .mpo_vnode_check_unlink = lomac_vnode_check_unlink,
3071 .mpo_vnode_check_write = lomac_vnode_check_write,
3072 .mpo_vnode_copy_label = lomac_copy_label,
3073 .mpo_vnode_create_extattr = lomac_vnode_create_extattr,
3074 .mpo_vnode_destroy_label = lomac_destroy_label,
3075 .mpo_vnode_execve_transition = lomac_vnode_execve_transition,
3076 .mpo_vnode_execve_will_transition = lomac_vnode_execve_will_transition,
3077 .mpo_vnode_externalize_label = lomac_externalize_label,
3078 .mpo_vnode_init_label = lomac_init_label,
3079 .mpo_vnode_internalize_label = lomac_internalize_label,
3080 .mpo_vnode_relabel = lomac_vnode_relabel,
3081 .mpo_vnode_setlabel_extattr = lomac_vnode_setlabel_extattr,
3082 };
3083
3084 MAC_POLICY_SET(&lomac_ops, mac_lomac, "TrustedBSD MAC/LOMAC",
3085 MPC_LOADTIME_FLAG_NOTLATE, &lomac_slot);
Cache object: a4c4d8b9daffc93b6c246175eeaf26a4
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