xref: /freebsd/sys/security/mac_lomac/mac_lomac.c (revision bb15ca603fa442c72dde3f3cb8b46db6970e3950)
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 static 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 static 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);
3086