xref: /freebsd/sys/security/mac_mls/mac_mls.c (revision 1e413cf93298b5b97441a21d9a50fdcd0ee9945e)
1 /*-
2  * Copyright (c) 1999-2002, 2007 Robert N. M. Watson
3  * Copyright (c) 2001-2005 McAfee, 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 McAfee
10  * Research, the Security Research Division of McAfee, 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  * MLS fixed label mandatory confidentiality 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/ksem.h>
54 #include <sys/mman.h>
55 #include <sys/malloc.h>
56 #include <sys/mount.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/pipe.h>
68 #include <sys/sx.h>
69 #include <sys/sysctl.h>
70 #include <sys/msg.h>
71 #include <sys/sem.h>
72 #include <sys/shm.h>
73 
74 #include <fs/devfs/devfs.h>
75 
76 #include <net/bpfdesc.h>
77 #include <net/if.h>
78 #include <net/if_types.h>
79 #include <net/if_var.h>
80 
81 #include <netinet/in.h>
82 #include <netinet/in_pcb.h>
83 #include <netinet/ip_var.h>
84 
85 #include <vm/uma.h>
86 #include <vm/vm.h>
87 
88 #include <security/mac/mac_policy.h>
89 #include <security/mac_mls/mac_mls.h>
90 
91 SYSCTL_DECL(_security_mac);
92 
93 SYSCTL_NODE(_security_mac, OID_AUTO, mls, CTLFLAG_RW, 0,
94     "TrustedBSD mac_mls policy controls");
95 
96 static int	mls_label_size = sizeof(struct mac_mls);
97 SYSCTL_INT(_security_mac_mls, OID_AUTO, label_size, CTLFLAG_RD,
98     &mls_label_size, 0, "Size of struct mac_mls");
99 
100 static int	mls_enabled = 1;
101 SYSCTL_INT(_security_mac_mls, OID_AUTO, enabled, CTLFLAG_RW, &mls_enabled, 0,
102     "Enforce MAC/MLS policy");
103 TUNABLE_INT("security.mac.mls.enabled", &mls_enabled);
104 
105 static int	destroyed_not_inited;
106 SYSCTL_INT(_security_mac_mls, OID_AUTO, destroyed_not_inited, CTLFLAG_RD,
107     &destroyed_not_inited, 0, "Count of labels destroyed but not inited");
108 
109 static int	ptys_equal = 0;
110 SYSCTL_INT(_security_mac_mls, OID_AUTO, ptys_equal, CTLFLAG_RW,
111     &ptys_equal, 0, "Label pty devices as mls/equal on create");
112 TUNABLE_INT("security.mac.mls.ptys_equal", &ptys_equal);
113 
114 static int	revocation_enabled = 0;
115 SYSCTL_INT(_security_mac_mls, OID_AUTO, revocation_enabled, CTLFLAG_RW,
116     &revocation_enabled, 0, "Revoke access to objects on relabel");
117 TUNABLE_INT("security.mac.mls.revocation_enabled", &revocation_enabled);
118 
119 static int	max_compartments = MAC_MLS_MAX_COMPARTMENTS;
120 SYSCTL_INT(_security_mac_mls, OID_AUTO, max_compartments, CTLFLAG_RD,
121     &max_compartments, 0, "Maximum compartments the policy supports");
122 
123 static int	mls_slot;
124 #define	SLOT(l)	((struct mac_mls *)mac_label_get((l), mls_slot))
125 #define	SLOT_SET(l, val) mac_label_set((l), mls_slot, (uintptr_t)(val))
126 
127 static uma_zone_t	zone_mls;
128 
129 static __inline int
130 mls_bit_set_empty(u_char *set) {
131 	int i;
132 
133 	for (i = 0; i < MAC_MLS_MAX_COMPARTMENTS >> 3; i++)
134 		if (set[i] != 0)
135 			return (0);
136 	return (1);
137 }
138 
139 static struct mac_mls *
140 mls_alloc(int flag)
141 {
142 
143 	return (uma_zalloc(zone_mls, flag | M_ZERO));
144 }
145 
146 static void
147 mls_free(struct mac_mls *mm)
148 {
149 
150 	if (mm != NULL)
151 		uma_zfree(zone_mls, mm);
152 	else
153 		atomic_add_int(&destroyed_not_inited, 1);
154 }
155 
156 static int
157 mls_atmostflags(struct mac_mls *mm, int flags)
158 {
159 
160 	if ((mm->mm_flags & flags) != mm->mm_flags)
161 		return (EINVAL);
162 	return (0);
163 }
164 
165 static int
166 mls_dominate_element(struct mac_mls_element *a, struct mac_mls_element *b)
167 {
168 	int bit;
169 
170 	switch (a->mme_type) {
171 	case MAC_MLS_TYPE_EQUAL:
172 	case MAC_MLS_TYPE_HIGH:
173 		return (1);
174 
175 	case MAC_MLS_TYPE_LOW:
176 		switch (b->mme_type) {
177 		case MAC_MLS_TYPE_LEVEL:
178 		case MAC_MLS_TYPE_HIGH:
179 			return (0);
180 
181 		case MAC_MLS_TYPE_EQUAL:
182 		case MAC_MLS_TYPE_LOW:
183 			return (1);
184 
185 		default:
186 			panic("mls_dominate_element: b->mme_type invalid");
187 		}
188 
189 	case MAC_MLS_TYPE_LEVEL:
190 		switch (b->mme_type) {
191 		case MAC_MLS_TYPE_EQUAL:
192 		case MAC_MLS_TYPE_LOW:
193 			return (1);
194 
195 		case MAC_MLS_TYPE_HIGH:
196 			return (0);
197 
198 		case MAC_MLS_TYPE_LEVEL:
199 			for (bit = 1; bit <= MAC_MLS_MAX_COMPARTMENTS; bit++)
200 				if (!MAC_MLS_BIT_TEST(bit,
201 				    a->mme_compartments) &&
202 				    MAC_MLS_BIT_TEST(bit, b->mme_compartments))
203 					return (0);
204 			return (a->mme_level >= b->mme_level);
205 
206 		default:
207 			panic("mls_dominate_element: b->mme_type invalid");
208 		}
209 
210 	default:
211 		panic("mls_dominate_element: a->mme_type invalid");
212 	}
213 
214 	return (0);
215 }
216 
217 static int
218 mls_range_in_range(struct mac_mls *rangea, struct mac_mls *rangeb)
219 {
220 
221 	return (mls_dominate_element(&rangeb->mm_rangehigh,
222 	    &rangea->mm_rangehigh) &&
223 	    mls_dominate_element(&rangea->mm_rangelow,
224 	    &rangeb->mm_rangelow));
225 }
226 
227 static int
228 mls_effective_in_range(struct mac_mls *effective, struct mac_mls *range)
229 {
230 
231 	KASSERT((effective->mm_flags & MAC_MLS_FLAG_EFFECTIVE) != 0,
232 	    ("mls_effective_in_range: a not effective"));
233 	KASSERT((range->mm_flags & MAC_MLS_FLAG_RANGE) != 0,
234 	    ("mls_effective_in_range: b not range"));
235 
236 	return (mls_dominate_element(&range->mm_rangehigh,
237 	    &effective->mm_effective) &&
238 	    mls_dominate_element(&effective->mm_effective,
239 	    &range->mm_rangelow));
240 
241 	return (1);
242 }
243 
244 static int
245 mls_dominate_effective(struct mac_mls *a, struct mac_mls *b)
246 {
247 	KASSERT((a->mm_flags & MAC_MLS_FLAG_EFFECTIVE) != 0,
248 	    ("mls_dominate_effective: a not effective"));
249 	KASSERT((b->mm_flags & MAC_MLS_FLAG_EFFECTIVE) != 0,
250 	    ("mls_dominate_effective: b not effective"));
251 
252 	return (mls_dominate_element(&a->mm_effective, &b->mm_effective));
253 }
254 
255 static int
256 mls_equal_element(struct mac_mls_element *a, struct mac_mls_element *b)
257 {
258 
259 	if (a->mme_type == MAC_MLS_TYPE_EQUAL ||
260 	    b->mme_type == MAC_MLS_TYPE_EQUAL)
261 		return (1);
262 
263 	return (a->mme_type == b->mme_type && a->mme_level == b->mme_level);
264 }
265 
266 static int
267 mls_equal_effective(struct mac_mls *a, struct mac_mls *b)
268 {
269 
270 	KASSERT((a->mm_flags & MAC_MLS_FLAG_EFFECTIVE) != 0,
271 	    ("mls_equal_effective: a not effective"));
272 	KASSERT((b->mm_flags & MAC_MLS_FLAG_EFFECTIVE) != 0,
273 	    ("mls_equal_effective: b not effective"));
274 
275 	return (mls_equal_element(&a->mm_effective, &b->mm_effective));
276 }
277 
278 static int
279 mls_contains_equal(struct mac_mls *mm)
280 {
281 
282 	if (mm->mm_flags & MAC_MLS_FLAG_EFFECTIVE)
283 		if (mm->mm_effective.mme_type == MAC_MLS_TYPE_EQUAL)
284 			return (1);
285 
286 	if (mm->mm_flags & MAC_MLS_FLAG_RANGE) {
287 		if (mm->mm_rangelow.mme_type == MAC_MLS_TYPE_EQUAL)
288 			return (1);
289 		if (mm->mm_rangehigh.mme_type == MAC_MLS_TYPE_EQUAL)
290 			return (1);
291 	}
292 
293 	return (0);
294 }
295 
296 static int
297 mls_subject_privileged(struct mac_mls *mm)
298 {
299 
300 	KASSERT((mm->mm_flags & MAC_MLS_FLAGS_BOTH) == MAC_MLS_FLAGS_BOTH,
301 	    ("mls_subject_privileged: subject doesn't have both labels"));
302 
303 	/* If the effective is EQUAL, it's ok. */
304 	if (mm->mm_effective.mme_type == MAC_MLS_TYPE_EQUAL)
305 		return (0);
306 
307 	/* If either range endpoint is EQUAL, it's ok. */
308 	if (mm->mm_rangelow.mme_type == MAC_MLS_TYPE_EQUAL ||
309 	    mm->mm_rangehigh.mme_type == MAC_MLS_TYPE_EQUAL)
310 		return (0);
311 
312 	/* If the range is low-high, it's ok. */
313 	if (mm->mm_rangelow.mme_type == MAC_MLS_TYPE_LOW &&
314 	    mm->mm_rangehigh.mme_type == MAC_MLS_TYPE_HIGH)
315 		return (0);
316 
317 	/* It's not ok. */
318 	return (EPERM);
319 }
320 
321 static int
322 mls_valid(struct mac_mls *mm)
323 {
324 
325 	if (mm->mm_flags & MAC_MLS_FLAG_EFFECTIVE) {
326 		switch (mm->mm_effective.mme_type) {
327 		case MAC_MLS_TYPE_LEVEL:
328 			break;
329 
330 		case MAC_MLS_TYPE_EQUAL:
331 		case MAC_MLS_TYPE_HIGH:
332 		case MAC_MLS_TYPE_LOW:
333 			if (mm->mm_effective.mme_level != 0 ||
334 			    !MAC_MLS_BIT_SET_EMPTY(
335 			    mm->mm_effective.mme_compartments))
336 				return (EINVAL);
337 			break;
338 
339 		default:
340 			return (EINVAL);
341 		}
342 	} else {
343 		if (mm->mm_effective.mme_type != MAC_MLS_TYPE_UNDEF)
344 			return (EINVAL);
345 	}
346 
347 	if (mm->mm_flags & MAC_MLS_FLAG_RANGE) {
348 		switch (mm->mm_rangelow.mme_type) {
349 		case MAC_MLS_TYPE_LEVEL:
350 			break;
351 
352 		case MAC_MLS_TYPE_EQUAL:
353 		case MAC_MLS_TYPE_HIGH:
354 		case MAC_MLS_TYPE_LOW:
355 			if (mm->mm_rangelow.mme_level != 0 ||
356 			    !MAC_MLS_BIT_SET_EMPTY(
357 			    mm->mm_rangelow.mme_compartments))
358 				return (EINVAL);
359 			break;
360 
361 		default:
362 			return (EINVAL);
363 		}
364 
365 		switch (mm->mm_rangehigh.mme_type) {
366 		case MAC_MLS_TYPE_LEVEL:
367 			break;
368 
369 		case MAC_MLS_TYPE_EQUAL:
370 		case MAC_MLS_TYPE_HIGH:
371 		case MAC_MLS_TYPE_LOW:
372 			if (mm->mm_rangehigh.mme_level != 0 ||
373 			    !MAC_MLS_BIT_SET_EMPTY(
374 			    mm->mm_rangehigh.mme_compartments))
375 				return (EINVAL);
376 			break;
377 
378 		default:
379 			return (EINVAL);
380 		}
381 		if (!mls_dominate_element(&mm->mm_rangehigh,
382 		    &mm->mm_rangelow))
383 			return (EINVAL);
384 	} else {
385 		if (mm->mm_rangelow.mme_type != MAC_MLS_TYPE_UNDEF ||
386 		    mm->mm_rangehigh.mme_type != MAC_MLS_TYPE_UNDEF)
387 			return (EINVAL);
388 	}
389 
390 	return (0);
391 }
392 
393 static void
394 mls_set_range(struct mac_mls *mm, u_short typelow, u_short levellow,
395     u_char *compartmentslow, u_short typehigh, u_short levelhigh,
396     u_char *compartmentshigh)
397 {
398 
399 	mm->mm_rangelow.mme_type = typelow;
400 	mm->mm_rangelow.mme_level = levellow;
401 	if (compartmentslow != NULL)
402 		memcpy(mm->mm_rangelow.mme_compartments,
403 		    compartmentslow,
404 		    sizeof(mm->mm_rangelow.mme_compartments));
405 	mm->mm_rangehigh.mme_type = typehigh;
406 	mm->mm_rangehigh.mme_level = levelhigh;
407 	if (compartmentshigh != NULL)
408 		memcpy(mm->mm_rangehigh.mme_compartments,
409 		    compartmentshigh,
410 		    sizeof(mm->mm_rangehigh.mme_compartments));
411 	mm->mm_flags |= MAC_MLS_FLAG_RANGE;
412 }
413 
414 static void
415 mls_set_effective(struct mac_mls *mm, u_short type, u_short level,
416     u_char *compartments)
417 {
418 
419 	mm->mm_effective.mme_type = type;
420 	mm->mm_effective.mme_level = level;
421 	if (compartments != NULL)
422 		memcpy(mm->mm_effective.mme_compartments, compartments,
423 		    sizeof(mm->mm_effective.mme_compartments));
424 	mm->mm_flags |= MAC_MLS_FLAG_EFFECTIVE;
425 }
426 
427 static void
428 mls_copy_range(struct mac_mls *labelfrom, struct mac_mls *labelto)
429 {
430 
431 	KASSERT((labelfrom->mm_flags & MAC_MLS_FLAG_RANGE) != 0,
432 	    ("mls_copy_range: labelfrom not range"));
433 
434 	labelto->mm_rangelow = labelfrom->mm_rangelow;
435 	labelto->mm_rangehigh = labelfrom->mm_rangehigh;
436 	labelto->mm_flags |= MAC_MLS_FLAG_RANGE;
437 }
438 
439 static void
440 mls_copy_effective(struct mac_mls *labelfrom, struct mac_mls *labelto)
441 {
442 
443 	KASSERT((labelfrom->mm_flags & MAC_MLS_FLAG_EFFECTIVE) != 0,
444 	    ("mls_copy_effective: labelfrom not effective"));
445 
446 	labelto->mm_effective = labelfrom->mm_effective;
447 	labelto->mm_flags |= MAC_MLS_FLAG_EFFECTIVE;
448 }
449 
450 static void
451 mls_copy(struct mac_mls *source, struct mac_mls *dest)
452 {
453 
454 	if (source->mm_flags & MAC_MLS_FLAG_EFFECTIVE)
455 		mls_copy_effective(source, dest);
456 	if (source->mm_flags & MAC_MLS_FLAG_RANGE)
457 		mls_copy_range(source, dest);
458 }
459 
460 /*
461  * Policy module operations.
462  */
463 static void
464 mls_init(struct mac_policy_conf *conf)
465 {
466 
467 	zone_mls = uma_zcreate("mac_mls", sizeof(struct mac_mls), NULL,
468 	    NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
469 }
470 
471 /*
472  * Label operations.
473  */
474 static void
475 mls_init_label(struct label *label)
476 {
477 
478 	SLOT_SET(label, mls_alloc(M_WAITOK));
479 }
480 
481 static int
482 mls_init_label_waitcheck(struct label *label, int flag)
483 {
484 
485 	SLOT_SET(label, mls_alloc(flag));
486 	if (SLOT(label) == NULL)
487 		return (ENOMEM);
488 
489 	return (0);
490 }
491 
492 static void
493 mls_destroy_label(struct label *label)
494 {
495 
496 	mls_free(SLOT(label));
497 	SLOT_SET(label, NULL);
498 }
499 
500 /*
501  * mls_element_to_string() accepts an sbuf and MLS element.  It converts the
502  * MLS element to a string and stores the result in the sbuf; if there isn't
503  * space in the sbuf, -1 is returned.
504  */
505 static int
506 mls_element_to_string(struct sbuf *sb, struct mac_mls_element *element)
507 {
508 	int i, first;
509 
510 	switch (element->mme_type) {
511 	case MAC_MLS_TYPE_HIGH:
512 		return (sbuf_printf(sb, "high"));
513 
514 	case MAC_MLS_TYPE_LOW:
515 		return (sbuf_printf(sb, "low"));
516 
517 	case MAC_MLS_TYPE_EQUAL:
518 		return (sbuf_printf(sb, "equal"));
519 
520 	case MAC_MLS_TYPE_LEVEL:
521 		if (sbuf_printf(sb, "%d", element->mme_level) == -1)
522 			return (-1);
523 
524 		first = 1;
525 		for (i = 1; i <= MAC_MLS_MAX_COMPARTMENTS; i++) {
526 			if (MAC_MLS_BIT_TEST(i, element->mme_compartments)) {
527 				if (first) {
528 					if (sbuf_putc(sb, ':') == -1)
529 						return (-1);
530 					if (sbuf_printf(sb, "%d", i) == -1)
531 						return (-1);
532 					first = 0;
533 				} else {
534 					if (sbuf_printf(sb, "+%d", i) == -1)
535 						return (-1);
536 				}
537 			}
538 		}
539 		return (0);
540 
541 	default:
542 		panic("mls_element_to_string: invalid type (%d)",
543 		    element->mme_type);
544 	}
545 }
546 
547 /*
548  * mls_to_string() converts an MLS label to a string, and places the results
549  * in the passed sbuf.  It returns 0 on success, or EINVAL if there isn't
550  * room in the sbuf.  Note: the sbuf will be modified even in a failure case,
551  * so the caller may need to revert the sbuf by restoring the offset if
552  * that's undesired.
553  */
554 static int
555 mls_to_string(struct sbuf *sb, struct mac_mls *mm)
556 {
557 
558 	if (mm->mm_flags & MAC_MLS_FLAG_EFFECTIVE) {
559 		if (mls_element_to_string(sb, &mm->mm_effective) == -1)
560 			return (EINVAL);
561 	}
562 
563 	if (mm->mm_flags & MAC_MLS_FLAG_RANGE) {
564 		if (sbuf_putc(sb, '(') == -1)
565 			return (EINVAL);
566 
567 		if (mls_element_to_string(sb, &mm->mm_rangelow) == -1)
568 			return (EINVAL);
569 
570 		if (sbuf_putc(sb, '-') == -1)
571 			return (EINVAL);
572 
573 		if (mls_element_to_string(sb, &mm->mm_rangehigh) == -1)
574 			return (EINVAL);
575 
576 		if (sbuf_putc(sb, ')') == -1)
577 			return (EINVAL);
578 	}
579 
580 	return (0);
581 }
582 
583 static int
584 mls_externalize_label(struct label *label, char *element_name,
585     struct sbuf *sb, int *claimed)
586 {
587 	struct mac_mls *mm;
588 
589 	if (strcmp(MAC_MLS_LABEL_NAME, element_name) != 0)
590 		return (0);
591 
592 	(*claimed)++;
593 
594 	mm = SLOT(label);
595 
596 	return (mls_to_string(sb, mm));
597 }
598 
599 static int
600 mls_parse_element(struct mac_mls_element *element, char *string)
601 {
602 	char *compartment, *end, *level;
603 	int value;
604 
605 	if (strcmp(string, "high") == 0 || strcmp(string, "hi") == 0) {
606 		element->mme_type = MAC_MLS_TYPE_HIGH;
607 		element->mme_level = MAC_MLS_TYPE_UNDEF;
608 	} else if (strcmp(string, "low") == 0 || strcmp(string, "lo") == 0) {
609 		element->mme_type = MAC_MLS_TYPE_LOW;
610 		element->mme_level = MAC_MLS_TYPE_UNDEF;
611 	} else if (strcmp(string, "equal") == 0 ||
612 	    strcmp(string, "eq") == 0) {
613 		element->mme_type = MAC_MLS_TYPE_EQUAL;
614 		element->mme_level = MAC_MLS_TYPE_UNDEF;
615 	} else {
616 		element->mme_type = MAC_MLS_TYPE_LEVEL;
617 
618 		/*
619 		 * Numeric level piece of the element.
620 		 */
621 		level = strsep(&string, ":");
622 		value = strtol(level, &end, 10);
623 		if (end == level || *end != '\0')
624 			return (EINVAL);
625 		if (value < 0 || value > 65535)
626 			return (EINVAL);
627 		element->mme_level = value;
628 
629 		/*
630 		 * Optional compartment piece of the element.  If none are
631 		 * included, we assume that the label has no compartments.
632 		 */
633 		if (string == NULL)
634 			return (0);
635 		if (*string == '\0')
636 			return (0);
637 
638 		while ((compartment = strsep(&string, "+")) != NULL) {
639 			value = strtol(compartment, &end, 10);
640 			if (compartment == end || *end != '\0')
641 				return (EINVAL);
642 			if (value < 1 || value > MAC_MLS_MAX_COMPARTMENTS)
643 				return (EINVAL);
644 			MAC_MLS_BIT_SET(value, element->mme_compartments);
645 		}
646 	}
647 
648 	return (0);
649 }
650 
651 /*
652  * Note: destructively consumes the string, make a local copy before calling
653  * if that's a problem.
654  */
655 static int
656 mls_parse(struct mac_mls *mm, char *string)
657 {
658 	char *rangehigh, *rangelow, *effective;
659 	int error;
660 
661 	effective = strsep(&string, "(");
662 	if (*effective == '\0')
663 		effective = NULL;
664 
665 	if (string != NULL) {
666 		rangelow = strsep(&string, "-");
667 		if (string == NULL)
668 			return (EINVAL);
669 		rangehigh = strsep(&string, ")");
670 		if (string == NULL)
671 			return (EINVAL);
672 		if (*string != '\0')
673 			return (EINVAL);
674 	} else {
675 		rangelow = NULL;
676 		rangehigh = NULL;
677 	}
678 
679 	KASSERT((rangelow != NULL && rangehigh != NULL) ||
680 	    (rangelow == NULL && rangehigh == NULL),
681 	    ("mls_parse: range mismatch"));
682 
683 	bzero(mm, sizeof(*mm));
684 	if (effective != NULL) {
685 		error = mls_parse_element(&mm->mm_effective, effective);
686 		if (error)
687 			return (error);
688 		mm->mm_flags |= MAC_MLS_FLAG_EFFECTIVE;
689 	}
690 
691 	if (rangelow != NULL) {
692 		error = mls_parse_element(&mm->mm_rangelow,
693 		    rangelow);
694 		if (error)
695 			return (error);
696 		error = mls_parse_element(&mm->mm_rangehigh,
697 		    rangehigh);
698 		if (error)
699 			return (error);
700 		mm->mm_flags |= MAC_MLS_FLAG_RANGE;
701 	}
702 
703 	error = mls_valid(mm);
704 	if (error)
705 		return (error);
706 
707 	return (0);
708 }
709 
710 static int
711 mls_internalize_label(struct label *label, char *element_name,
712     char *element_data, int *claimed)
713 {
714 	struct mac_mls *mm, mm_temp;
715 	int error;
716 
717 	if (strcmp(MAC_MLS_LABEL_NAME, element_name) != 0)
718 		return (0);
719 
720 	(*claimed)++;
721 
722 	error = mls_parse(&mm_temp, element_data);
723 	if (error)
724 		return (error);
725 
726 	mm = SLOT(label);
727 	*mm = mm_temp;
728 
729 	return (0);
730 }
731 
732 static void
733 mls_copy_label(struct label *src, struct label *dest)
734 {
735 
736 	*SLOT(dest) = *SLOT(src);
737 }
738 
739 
740 /*
741  * Object-specific entry point implementations are sorted alphabetically by
742  * object type name and then by operation.
743  */
744 static int
745 mls_bpfdesc_check_receive(struct bpf_d *d, struct label *dlabel,
746      struct ifnet *ifp, struct label *ifplabel)
747 {
748 	struct mac_mls *a, *b;
749 
750 	if (!mls_enabled)
751 		return (0);
752 
753 	a = SLOT(dlabel);
754 	b = SLOT(ifplabel);
755 
756 	if (mls_equal_effective(a, b))
757 		return (0);
758 	return (EACCES);
759 }
760 
761 static void
762 mls_bpfdesc_create(struct ucred *cred, struct bpf_d *d, struct label *dlabel)
763 {
764 	struct mac_mls *source, *dest;
765 
766 	source = SLOT(cred->cr_label);
767 	dest = SLOT(dlabel);
768 
769 	mls_copy_effective(source, dest);
770 }
771 
772 static void
773 mls_bpfdesc_create_mbuf(struct bpf_d *d, struct label *dlabel,
774     struct mbuf *m, struct label *mlabel)
775 {
776 	struct mac_mls *source, *dest;
777 
778 	source = SLOT(dlabel);
779 	dest = SLOT(mlabel);
780 
781 	mls_copy_effective(source, dest);
782 }
783 
784 static int
785 mls_cred_check_relabel(struct ucred *cred, struct label *newlabel)
786 {
787 	struct mac_mls *subj, *new;
788 	int error;
789 
790 	subj = SLOT(cred->cr_label);
791 	new = SLOT(newlabel);
792 
793 	/*
794 	 * If there is an MLS label update for the credential, it may be an
795 	 * update of effective, range, or both.
796 	 */
797 	error = mls_atmostflags(new, MAC_MLS_FLAGS_BOTH);
798 	if (error)
799 		return (error);
800 
801 	/*
802 	 * If the MLS label is to be changed, authorize as appropriate.
803 	 */
804 	if (new->mm_flags & MAC_MLS_FLAGS_BOTH) {
805 		/*
806 		 * If the change request modifies both the MLS label
807 		 * effective and range, check that the new effective will be
808 		 * in the new range.
809 		 */
810 		if ((new->mm_flags & MAC_MLS_FLAGS_BOTH) ==
811 		    MAC_MLS_FLAGS_BOTH && !mls_effective_in_range(new, new))
812 			return (EINVAL);
813 
814 		/*
815 		 * To change the MLS effective label on a credential, the new
816 		 * effective label must be in the current range.
817 		 */
818 		if (new->mm_flags & MAC_MLS_FLAG_EFFECTIVE &&
819 		    !mls_effective_in_range(new, subj))
820 			return (EPERM);
821 
822 		/*
823 		 * To change the MLS range label on a credential, the new
824 		 * range must be in the current range.
825 		 */
826 		if (new->mm_flags & MAC_MLS_FLAG_RANGE &&
827 		    !mls_range_in_range(new, subj))
828 			return (EPERM);
829 
830 		/*
831 		 * To have EQUAL in any component of the new credential MLS
832 		 * label, the subject must already have EQUAL in their label.
833 		 */
834 		if (mls_contains_equal(new)) {
835 			error = mls_subject_privileged(subj);
836 			if (error)
837 				return (error);
838 		}
839 	}
840 
841 	return (0);
842 }
843 
844 static int
845 mls_cred_check_visible(struct ucred *cr1, struct ucred *cr2)
846 {
847 	struct mac_mls *subj, *obj;
848 
849 	if (!mls_enabled)
850 		return (0);
851 
852 	subj = SLOT(cr1->cr_label);
853 	obj = SLOT(cr2->cr_label);
854 
855 	/* XXX: range */
856 	if (!mls_dominate_effective(subj, obj))
857 		return (ESRCH);
858 
859 	return (0);
860 }
861 
862 static void
863 mls_cred_relabel(struct ucred *cred, struct label *newlabel)
864 {
865 	struct mac_mls *source, *dest;
866 
867 	source = SLOT(newlabel);
868 	dest = SLOT(cred->cr_label);
869 
870 	mls_copy(source, dest);
871 }
872 
873 static void
874 mls_devfs_create_device(struct ucred *cred, struct mount *mp,
875     struct cdev *dev, struct devfs_dirent *de, struct label *delabel)
876 {
877 	struct mac_mls *mm;
878 	int mls_type;
879 
880 	mm = SLOT(delabel);
881 	if (strcmp(dev->si_name, "null") == 0 ||
882 	    strcmp(dev->si_name, "zero") == 0 ||
883 	    strcmp(dev->si_name, "random") == 0 ||
884 	    strncmp(dev->si_name, "fd/", strlen("fd/")) == 0)
885 		mls_type = MAC_MLS_TYPE_EQUAL;
886 	else if (strcmp(dev->si_name, "kmem") == 0 ||
887 	    strcmp(dev->si_name, "mem") == 0)
888 		mls_type = MAC_MLS_TYPE_HIGH;
889 	else if (ptys_equal &&
890 	    (strncmp(dev->si_name, "ttyp", strlen("ttyp")) == 0 ||
891 	    strncmp(dev->si_name, "ptyp", strlen("ptyp")) == 0))
892 		mls_type = MAC_MLS_TYPE_EQUAL;
893 	else
894 		mls_type = MAC_MLS_TYPE_LOW;
895 	mls_set_effective(mm, mls_type, 0, NULL);
896 }
897 
898 static void
899 mls_devfs_create_directory(struct mount *mp, char *dirname, int dirnamelen,
900     struct devfs_dirent *de, struct label *delabel)
901 {
902 	struct mac_mls *mm;
903 
904 	mm = SLOT(delabel);
905 	mls_set_effective(mm, MAC_MLS_TYPE_LOW, 0, NULL);
906 }
907 
908 static void
909 mls_devfs_create_symlink(struct ucred *cred, struct mount *mp,
910     struct devfs_dirent *dd, struct label *ddlabel, struct devfs_dirent *de,
911     struct label *delabel)
912 {
913 	struct mac_mls *source, *dest;
914 
915 	source = SLOT(cred->cr_label);
916 	dest = SLOT(delabel);
917 
918 	mls_copy_effective(source, dest);
919 }
920 
921 static void
922 mls_devfs_update(struct mount *mp, struct devfs_dirent *de,
923     struct label *delabel, struct vnode *vp, struct label *vplabel)
924 {
925 	struct mac_mls *source, *dest;
926 
927 	source = SLOT(vplabel);
928 	dest = SLOT(delabel);
929 
930 	mls_copy_effective(source, dest);
931 }
932 
933 static void
934 mls_devfs_vnode_associate(struct mount *mp, struct label *mplabel,
935     struct devfs_dirent *de, struct label *delabel, struct vnode *vp,
936     struct label *vplabel)
937 {
938 	struct mac_mls *source, *dest;
939 
940 	source = SLOT(delabel);
941 	dest = SLOT(vplabel);
942 
943 	mls_copy_effective(source, dest);
944 }
945 
946 static int
947 mls_ifnet_check_relabel(struct ucred *cred, struct ifnet *ifp,
948     struct label *ifplabel, struct label *newlabel)
949 {
950 	struct mac_mls *subj, *new;
951 	int error;
952 
953 	subj = SLOT(cred->cr_label);
954 	new = SLOT(newlabel);
955 
956 	/*
957 	 * If there is an MLS label update for the interface, it may be an
958 	 * update of effective, range, or both.
959 	 */
960 	error = mls_atmostflags(new, MAC_MLS_FLAGS_BOTH);
961 	if (error)
962 		return (error);
963 
964 	/*
965 	 * Relabeling network interfaces requires MLS privilege.
966 	 */
967 	error = mls_subject_privileged(subj);
968 
969 	return (0);
970 }
971 
972 static int
973 mls_ifnet_check_transmit(struct ifnet *ifp, struct label *ifplabel,
974     struct mbuf *m, struct label *mlabel)
975 {
976 	struct mac_mls *p, *i;
977 
978 	if (!mls_enabled)
979 		return (0);
980 
981 	p = SLOT(mlabel);
982 	i = SLOT(ifplabel);
983 
984 	return (mls_effective_in_range(p, i) ? 0 : EACCES);
985 }
986 
987 static void
988 mls_ifnet_create(struct ifnet *ifp, struct label *ifplabel)
989 {
990 	struct mac_mls *dest;
991 	int type;
992 
993 	dest = SLOT(ifplabel);
994 
995 	if (ifp->if_type == IFT_LOOP)
996 		type = MAC_MLS_TYPE_EQUAL;
997 	else
998 		type = MAC_MLS_TYPE_LOW;
999 
1000 	mls_set_effective(dest, type, 0, NULL);
1001 	mls_set_range(dest, type, 0, NULL, type, 0, NULL);
1002 }
1003 
1004 static void
1005 mls_ifnet_create_mbuf(struct ifnet *ifp, struct label *ifplabel,
1006     struct mbuf *m, struct label *mlabel)
1007 {
1008 	struct mac_mls *source, *dest;
1009 
1010 	source = SLOT(ifplabel);
1011 	dest = SLOT(mlabel);
1012 
1013 	mls_copy_effective(source, dest);
1014 }
1015 
1016 static void
1017 mls_ifnet_relabel(struct ucred *cred, struct ifnet *ifp,
1018     struct label *ifplabel, struct label *newlabel)
1019 {
1020 	struct mac_mls *source, *dest;
1021 
1022 	source = SLOT(newlabel);
1023 	dest = SLOT(ifplabel);
1024 
1025 	mls_copy(source, dest);
1026 }
1027 
1028 static int
1029 mls_inpcb_check_deliver(struct inpcb *inp, struct label *inplabel,
1030     struct mbuf *m, struct label *mlabel)
1031 {
1032 	struct mac_mls *p, *i;
1033 
1034 	if (!mls_enabled)
1035 		return (0);
1036 
1037 	p = SLOT(mlabel);
1038 	i = SLOT(inplabel);
1039 
1040 	return (mls_equal_effective(p, i) ? 0 : EACCES);
1041 }
1042 
1043 static void
1044 mls_inpcb_create(struct socket *so, struct label *solabel, struct inpcb *inp,
1045     struct label *inplabel)
1046 {
1047 	struct mac_mls *source, *dest;
1048 
1049 	source = SLOT(solabel);
1050 	dest = SLOT(inplabel);
1051 
1052 	mls_copy_effective(source, dest);
1053 }
1054 
1055 static void
1056 mls_inpcb_create_mbuf(struct inpcb *inp, struct label *inplabel,
1057     struct mbuf *m, struct label *mlabel)
1058 {
1059 	struct mac_mls *source, *dest;
1060 
1061 	source = SLOT(inplabel);
1062 	dest = SLOT(mlabel);
1063 
1064 	mls_copy_effective(source, dest);
1065 }
1066 
1067 static void
1068 mls_inpcb_sosetlabel(struct socket *so, struct label *solabel,
1069     struct inpcb *inp, struct label *inplabel)
1070 {
1071 	struct mac_mls *source, *dest;
1072 
1073 	source = SLOT(solabel);
1074 	dest = SLOT(inplabel);
1075 
1076 	mls_copy(source, dest);
1077 }
1078 
1079 static void
1080 mls_ipq_create(struct mbuf *m, struct label *mlabel, struct ipq *ipq,
1081     struct label *ipqlabel)
1082 {
1083 	struct mac_mls *source, *dest;
1084 
1085 	source = SLOT(mlabel);
1086 	dest = SLOT(ipqlabel);
1087 
1088 	mls_copy_effective(source, dest);
1089 }
1090 
1091 static int
1092 mls_ipq_match(struct mbuf *m, struct label *mlabel, struct ipq *ipq,
1093     struct label *ipqlabel)
1094 {
1095 	struct mac_mls *a, *b;
1096 
1097 	a = SLOT(ipqlabel);
1098 	b = SLOT(mlabel);
1099 
1100 	return (mls_equal_effective(a, b));
1101 }
1102 
1103 static void
1104 mls_ipq_reassemble(struct ipq *ipq, struct label *ipqlabel, struct mbuf *m,
1105     struct label *mlabel)
1106 {
1107 	struct mac_mls *source, *dest;
1108 
1109 	source = SLOT(ipqlabel);
1110 	dest = SLOT(mlabel);
1111 
1112 	/* Just use the head, since we require them all to match. */
1113 	mls_copy_effective(source, dest);
1114 }
1115 
1116 static void
1117 mls_ipq_update(struct mbuf *m, struct label *mlabel, struct ipq *ipq,
1118     struct label *ipqlabel)
1119 {
1120 
1121 	/* NOOP: we only accept matching labels, so no need to update */
1122 }
1123 
1124 static int
1125 mls_mount_check_stat(struct ucred *cred, struct mount *mp,
1126     struct label *mntlabel)
1127 {
1128 	struct mac_mls *subj, *obj;
1129 
1130 	if (!mls_enabled)
1131 		return (0);
1132 
1133 	subj = SLOT(cred->cr_label);
1134 	obj = SLOT(mntlabel);
1135 
1136 	if (!mls_dominate_effective(subj, obj))
1137 		return (EACCES);
1138 
1139 	return (0);
1140 }
1141 
1142 static void
1143 mls_mount_create(struct ucred *cred, struct mount *mp, struct label *mplabel)
1144 {
1145 	struct mac_mls *source, *dest;
1146 
1147 	source = SLOT(cred->cr_label);
1148 	dest = SLOT(mplabel);
1149 
1150 	mls_copy_effective(source, dest);
1151 }
1152 
1153 static void
1154 mls_netatalk_aarp_send(struct ifnet *ifp, struct label *ifplabel,
1155     struct mbuf *m, struct label *mlabel)
1156 {
1157 	struct mac_mls *dest;
1158 
1159 	dest = SLOT(mlabel);
1160 
1161 	mls_set_effective(dest, MAC_MLS_TYPE_EQUAL, 0, NULL);
1162 }
1163 
1164 static void
1165 mls_netinet_arp_send(struct ifnet *ifp, struct label *ifplabel,
1166     struct mbuf *m, struct label *mlabel)
1167 {
1168 	struct mac_mls *dest;
1169 
1170 	dest = SLOT(mlabel);
1171 
1172 	mls_set_effective(dest, MAC_MLS_TYPE_EQUAL, 0, NULL);
1173 }
1174 
1175 static void
1176 mls_netinet_firewall_reply(struct mbuf *mrecv, struct label *mrecvlabel,
1177     struct mbuf *msend, struct label *msendlabel)
1178 {
1179 	struct mac_mls *source, *dest;
1180 
1181 	source = SLOT(mrecvlabel);
1182 	dest = SLOT(msendlabel);
1183 
1184 	mls_copy_effective(source, dest);
1185 }
1186 
1187 static void
1188 mls_netinet_firewall_send(struct mbuf *m, struct label *mlabel)
1189 {
1190 	struct mac_mls *dest;
1191 
1192 	dest = SLOT(mlabel);
1193 
1194 	/* XXX: where is the label for the firewall really comming from? */
1195 	mls_set_effective(dest, MAC_MLS_TYPE_EQUAL, 0, NULL);
1196 }
1197 
1198 static void
1199 mls_netinet_fragment(struct mbuf *m, struct label *mlabel, struct mbuf *frag,
1200     struct label *fraglabel)
1201 {
1202 	struct mac_mls *source, *dest;
1203 
1204 	source = SLOT(mlabel);
1205 	dest = SLOT(fraglabel);
1206 
1207 	mls_copy_effective(source, dest);
1208 }
1209 
1210 static void
1211 mls_netinet_icmp_reply(struct mbuf *mrecv, struct label *mrecvlabel,
1212     struct mbuf *msend, struct label *msendlabel)
1213 {
1214 	struct mac_mls *source, *dest;
1215 
1216 	source = SLOT(mrecvlabel);
1217 	dest = SLOT(msendlabel);
1218 
1219 	mls_copy_effective(source, dest);
1220 }
1221 
1222 static void
1223 mls_netinet_igmp_send(struct ifnet *ifp, struct label *ifplabel,
1224     struct mbuf *m, struct label *mlabel)
1225 {
1226 	struct mac_mls *dest;
1227 
1228 	dest = SLOT(mlabel);
1229 
1230 	mls_set_effective(dest, MAC_MLS_TYPE_EQUAL, 0, NULL);
1231 }
1232 
1233 static void
1234 mls_netinet6_nd6_send(struct ifnet *ifp, struct label *ifplabel,
1235     struct mbuf *m, struct label *mlabel)
1236 {
1237 	struct mac_mls *dest;
1238 
1239 	dest = SLOT(mlabel);
1240 
1241 	mls_set_effective(dest, MAC_MLS_TYPE_EQUAL, 0, NULL);
1242 }
1243 
1244 static int
1245 mls_pipe_check_ioctl(struct ucred *cred, struct pipepair *pp,
1246     struct label *pplabel, unsigned long cmd, void /* caddr_t */ *data)
1247 {
1248 
1249 	if (!mls_enabled)
1250 		return (0);
1251 
1252 	/* XXX: This will be implemented soon... */
1253 
1254 	return (0);
1255 }
1256 
1257 static int
1258 mls_pipe_check_poll(struct ucred *cred, struct pipepair *pp,
1259     struct label *pplabel)
1260 {
1261 	struct mac_mls *subj, *obj;
1262 
1263 	if (!mls_enabled)
1264 		return (0);
1265 
1266 	subj = SLOT(cred->cr_label);
1267 	obj = SLOT(pplabel);
1268 
1269 	if (!mls_dominate_effective(subj, obj))
1270 		return (EACCES);
1271 
1272 	return (0);
1273 }
1274 
1275 static int
1276 mls_pipe_check_read(struct ucred *cred, struct pipepair *pp,
1277     struct label *pplabel)
1278 {
1279 	struct mac_mls *subj, *obj;
1280 
1281 	if (!mls_enabled)
1282 		return (0);
1283 
1284 	subj = SLOT(cred->cr_label);
1285 	obj = SLOT(pplabel);
1286 
1287 	if (!mls_dominate_effective(subj, obj))
1288 		return (EACCES);
1289 
1290 	return (0);
1291 }
1292 
1293 static int
1294 mls_pipe_check_relabel(struct ucred *cred, struct pipepair *pp,
1295     struct label *pplabel, struct label *newlabel)
1296 {
1297 	struct mac_mls *subj, *obj, *new;
1298 	int error;
1299 
1300 	new = SLOT(newlabel);
1301 	subj = SLOT(cred->cr_label);
1302 	obj = SLOT(pplabel);
1303 
1304 	/*
1305 	 * If there is an MLS label update for a pipe, it must be a effective
1306 	 * update.
1307 	 */
1308 	error = mls_atmostflags(new, MAC_MLS_FLAG_EFFECTIVE);
1309 	if (error)
1310 		return (error);
1311 
1312 	/*
1313 	 * To perform a relabel of a pipe (MLS label or not), MLS must
1314 	 * authorize the relabel.
1315 	 */
1316 	if (!mls_effective_in_range(obj, subj))
1317 		return (EPERM);
1318 
1319 	/*
1320 	 * If the MLS label is to be changed, authorize as appropriate.
1321 	 */
1322 	if (new->mm_flags & MAC_MLS_FLAG_EFFECTIVE) {
1323 		/*
1324 		 * To change the MLS label on a pipe, the new pipe label must
1325 		 * be in the subject range.
1326 		 */
1327 		if (!mls_effective_in_range(new, subj))
1328 			return (EPERM);
1329 
1330 		/*
1331 		 * To change the MLS label on a pipe to be EQUAL, the subject
1332 		 * must have appropriate privilege.
1333 		 */
1334 		if (mls_contains_equal(new)) {
1335 			error = mls_subject_privileged(subj);
1336 			if (error)
1337 				return (error);
1338 		}
1339 	}
1340 
1341 	return (0);
1342 }
1343 
1344 static int
1345 mls_pipe_check_stat(struct ucred *cred, struct pipepair *pp,
1346     struct label *pplabel)
1347 {
1348 	struct mac_mls *subj, *obj;
1349 
1350 	if (!mls_enabled)
1351 		return (0);
1352 
1353 	subj = SLOT(cred->cr_label);
1354 	obj = SLOT(pplabel);
1355 
1356 	if (!mls_dominate_effective(subj, obj))
1357 		return (EACCES);
1358 
1359 	return (0);
1360 }
1361 
1362 static int
1363 mls_pipe_check_write(struct ucred *cred, struct pipepair *pp,
1364     struct label *pplabel)
1365 {
1366 	struct mac_mls *subj, *obj;
1367 
1368 	if (!mls_enabled)
1369 		return (0);
1370 
1371 	subj = SLOT(cred->cr_label);
1372 	obj = SLOT(pplabel);
1373 
1374 	if (!mls_dominate_effective(obj, subj))
1375 		return (EACCES);
1376 
1377 	return (0);
1378 }
1379 
1380 static void
1381 mls_pipe_create(struct ucred *cred, struct pipepair *pp,
1382     struct label *pplabel)
1383 {
1384 	struct mac_mls *source, *dest;
1385 
1386 	source = SLOT(cred->cr_label);
1387 	dest = SLOT(pplabel);
1388 
1389 	mls_copy_effective(source, dest);
1390 }
1391 
1392 static void
1393 mls_pipe_relabel(struct ucred *cred, struct pipepair *pp,
1394     struct label *pplabel, struct label *newlabel)
1395 {
1396 	struct mac_mls *source, *dest;
1397 
1398 	source = SLOT(newlabel);
1399 	dest = SLOT(pplabel);
1400 
1401 	mls_copy(source, dest);
1402 }
1403 
1404 static int
1405 mls_posixsem_check_rdonly(struct ucred *cred, struct ksem *ks,
1406     struct label *kslabel)
1407 {
1408 	struct mac_mls *subj, *obj;
1409 
1410 	if (!mls_enabled)
1411 		return (0);
1412 
1413 	subj = SLOT(cred->cr_label);
1414 	obj = SLOT(kslabel);
1415 
1416 	if (!mls_dominate_effective(subj, obj))
1417 		return (EACCES);
1418 
1419 	return (0);
1420 }
1421 
1422 static int
1423 mls_posixsem_check_write(struct ucred *cred, struct ksem *ks,
1424     struct label *kslabel)
1425 {
1426 	struct mac_mls *subj, *obj;
1427 
1428 	if (!mls_enabled)
1429 		return (0);
1430 
1431 	subj = SLOT(cred->cr_label);
1432 	obj = SLOT(kslabel);
1433 
1434 	if (!mls_dominate_effective(obj, subj))
1435 		return (EACCES);
1436 
1437 	return (0);
1438 }
1439 
1440 static void
1441 mls_posixsem_create(struct ucred *cred, struct ksem *ks,
1442     struct label *kslabel)
1443 {
1444 	struct mac_mls *source, *dest;
1445 
1446 	source = SLOT(cred->cr_label);
1447 	dest = SLOT(kslabel);
1448 
1449 	mls_copy_effective(source, dest);
1450 }
1451 
1452 static void
1453 mls_proc_associate_nfsd(struct ucred *cred)
1454 {
1455 	struct mac_mls *label;
1456 
1457 	label = SLOT(cred->cr_label);
1458 	mls_set_effective(label, MAC_MLS_TYPE_LOW, 0, NULL);
1459 	mls_set_range(label, MAC_MLS_TYPE_LOW, 0, NULL, MAC_MLS_TYPE_HIGH, 0,
1460 	    NULL);
1461 }
1462 
1463 static int
1464 mls_proc_check_debug(struct ucred *cred, struct proc *p)
1465 {
1466 	struct mac_mls *subj, *obj;
1467 
1468 	if (!mls_enabled)
1469 		return (0);
1470 
1471 	subj = SLOT(cred->cr_label);
1472 	obj = SLOT(p->p_ucred->cr_label);
1473 
1474 	/* XXX: range checks */
1475 	if (!mls_dominate_effective(subj, obj))
1476 		return (ESRCH);
1477 	if (!mls_dominate_effective(obj, subj))
1478 		return (EACCES);
1479 
1480 	return (0);
1481 }
1482 
1483 static int
1484 mls_proc_check_sched(struct ucred *cred, struct proc *p)
1485 {
1486 	struct mac_mls *subj, *obj;
1487 
1488 	if (!mls_enabled)
1489 		return (0);
1490 
1491 	subj = SLOT(cred->cr_label);
1492 	obj = SLOT(p->p_ucred->cr_label);
1493 
1494 	/* XXX: range checks */
1495 	if (!mls_dominate_effective(subj, obj))
1496 		return (ESRCH);
1497 	if (!mls_dominate_effective(obj, subj))
1498 		return (EACCES);
1499 
1500 	return (0);
1501 }
1502 
1503 static int
1504 mls_proc_check_signal(struct ucred *cred, struct proc *p, int signum)
1505 {
1506 	struct mac_mls *subj, *obj;
1507 
1508 	if (!mls_enabled)
1509 		return (0);
1510 
1511 	subj = SLOT(cred->cr_label);
1512 	obj = SLOT(p->p_ucred->cr_label);
1513 
1514 	/* XXX: range checks */
1515 	if (!mls_dominate_effective(subj, obj))
1516 		return (ESRCH);
1517 	if (!mls_dominate_effective(obj, subj))
1518 		return (EACCES);
1519 
1520 	return (0);
1521 }
1522 
1523 static void
1524 mls_proc_create_init(struct ucred *cred)
1525 {
1526 	struct mac_mls *dest;
1527 
1528 	dest = SLOT(cred->cr_label);
1529 
1530 	mls_set_effective(dest, MAC_MLS_TYPE_LOW, 0, NULL);
1531 	mls_set_range(dest, MAC_MLS_TYPE_LOW, 0, NULL, MAC_MLS_TYPE_HIGH, 0,
1532 	    NULL);
1533 }
1534 
1535 static void
1536 mls_proc_create_swapper(struct ucred *cred)
1537 {
1538 	struct mac_mls *dest;
1539 
1540 	dest = SLOT(cred->cr_label);
1541 
1542 	mls_set_effective(dest, MAC_MLS_TYPE_EQUAL, 0, NULL);
1543 	mls_set_range(dest, MAC_MLS_TYPE_LOW, 0, NULL, MAC_MLS_TYPE_HIGH, 0,
1544 	    NULL);
1545 }
1546 
1547 static int
1548 mls_socket_check_deliver(struct socket *so, struct label *solabel,
1549     struct mbuf *m, struct label *mlabel)
1550 {
1551 	struct mac_mls *p, *s;
1552 
1553 	if (!mls_enabled)
1554 		return (0);
1555 
1556 	p = SLOT(mlabel);
1557 	s = SLOT(solabel);
1558 
1559 	return (mls_equal_effective(p, s) ? 0 : EACCES);
1560 }
1561 
1562 static int
1563 mls_socket_check_relabel(struct ucred *cred, struct socket *so,
1564     struct label *solabel, struct label *newlabel)
1565 {
1566 	struct mac_mls *subj, *obj, *new;
1567 	int error;
1568 
1569 	new = SLOT(newlabel);
1570 	subj = SLOT(cred->cr_label);
1571 	obj = SLOT(solabel);
1572 
1573 	/*
1574 	 * If there is an MLS label update for the socket, it may be an
1575 	 * update of effective.
1576 	 */
1577 	error = mls_atmostflags(new, MAC_MLS_FLAG_EFFECTIVE);
1578 	if (error)
1579 		return (error);
1580 
1581 	/*
1582 	 * To relabel a socket, the old socket effective must be in the
1583 	 * subject range.
1584 	 */
1585 	if (!mls_effective_in_range(obj, subj))
1586 		return (EPERM);
1587 
1588 	/*
1589 	 * If the MLS label is to be changed, authorize as appropriate.
1590 	 */
1591 	if (new->mm_flags & MAC_MLS_FLAG_EFFECTIVE) {
1592 		/*
1593 		 * To relabel a socket, the new socket effective must be in
1594 		 * the subject range.
1595 		 */
1596 		if (!mls_effective_in_range(new, subj))
1597 			return (EPERM);
1598 
1599 		/*
1600 		 * To change the MLS label on the socket to contain EQUAL,
1601 		 * the subject must have appropriate privilege.
1602 		 */
1603 		if (mls_contains_equal(new)) {
1604 			error = mls_subject_privileged(subj);
1605 			if (error)
1606 				return (error);
1607 		}
1608 	}
1609 
1610 	return (0);
1611 }
1612 
1613 static int
1614 mls_socket_check_visible(struct ucred *cred, struct socket *so,
1615     struct label *solabel)
1616 {
1617 	struct mac_mls *subj, *obj;
1618 
1619 	if (!mls_enabled)
1620 		return (0);
1621 
1622 	subj = SLOT(cred->cr_label);
1623 	obj = SLOT(solabel);
1624 
1625 	if (!mls_dominate_effective(subj, obj))
1626 		return (ENOENT);
1627 
1628 	return (0);
1629 }
1630 
1631 static void
1632 mls_socket_create(struct ucred *cred, struct socket *so,
1633     struct label *solabel)
1634 {
1635 	struct mac_mls *source, *dest;
1636 
1637 	source = SLOT(cred->cr_label);
1638 	dest = SLOT(solabel);
1639 
1640 	mls_copy_effective(source, dest);
1641 }
1642 
1643 static void
1644 mls_socket_create_mbuf(struct socket *so, struct label *solabel,
1645     struct mbuf *m, struct label *mlabel)
1646 {
1647 	struct mac_mls *source, *dest;
1648 
1649 	source = SLOT(solabel);
1650 	dest = SLOT(mlabel);
1651 
1652 	mls_copy_effective(source, dest);
1653 }
1654 
1655 static void
1656 mls_socket_newconn(struct socket *oldso, struct label *oldsolabel,
1657     struct socket *newso, struct label *newsolabel)
1658 {
1659 	struct mac_mls *source, *dest;
1660 
1661 	source = SLOT(oldsolabel);
1662 	dest = SLOT(newsolabel);
1663 
1664 	mls_copy_effective(source, dest);
1665 }
1666 
1667 static void
1668 mls_socket_relabel(struct ucred *cred, struct socket *so,
1669     struct label *solabel, struct label *newlabel)
1670 {
1671 	struct mac_mls *source, *dest;
1672 
1673 	source = SLOT(newlabel);
1674 	dest = SLOT(solabel);
1675 
1676 	mls_copy(source, dest);
1677 }
1678 
1679 static void
1680 mls_socketpeer_set_from_mbuf(struct mbuf *m, struct label *mlabel,
1681     struct socket *so, struct label *sopeerlabel)
1682 {
1683 	struct mac_mls *source, *dest;
1684 
1685 	source = SLOT(mlabel);
1686 	dest = SLOT(sopeerlabel);
1687 
1688 	mls_copy_effective(source, dest);
1689 }
1690 
1691 static void
1692 mls_socketpeer_set_from_socket(struct socket *oldso,
1693     struct label *oldsolabel, struct socket *newso,
1694     struct label *newsopeerlabel)
1695 {
1696 	struct mac_mls *source, *dest;
1697 
1698 	source = SLOT(oldsolabel);
1699 	dest = SLOT(newsopeerlabel);
1700 
1701 	mls_copy_effective(source, dest);
1702 }
1703 
1704 static void
1705 mls_syncache_create(struct label *label, struct inpcb *inp)
1706 {
1707 	struct mac_mls *source, *dest;
1708 
1709 	source = SLOT(inp->inp_label);
1710 	dest = SLOT(label);
1711 
1712 	mls_copy_effective(source, dest);
1713 }
1714 
1715 static void
1716 mls_syncache_create_mbuf(struct label *sc_label, struct mbuf *m,
1717     struct label *mlabel)
1718 {
1719 	struct mac_mls *source, *dest;
1720 
1721 	source = SLOT(sc_label);
1722 	dest = SLOT(mlabel);
1723 
1724 	mls_copy_effective(source, dest);
1725 }
1726 
1727 static int
1728 mls_system_check_acct(struct ucred *cred, struct vnode *vp,
1729     struct label *vplabel)
1730 {
1731 	struct mac_mls *subj, *obj;
1732 
1733 	if (!mls_enabled)
1734 		return (0);
1735 
1736 	subj = SLOT(cred->cr_label);
1737 	obj = SLOT(vplabel);
1738 
1739 	if (!mls_dominate_effective(obj, subj) ||
1740 	    !mls_dominate_effective(subj, obj))
1741 		return (EACCES);
1742 
1743 	return (0);
1744 }
1745 
1746 static int
1747 mls_system_check_auditctl(struct ucred *cred, struct vnode *vp,
1748     struct label *vplabel)
1749 {
1750 	struct mac_mls *subj, *obj;
1751 
1752 	if (!mls_enabled)
1753 		return (0);
1754 
1755 	subj = SLOT(cred->cr_label);
1756 	obj = SLOT(vplabel);
1757 
1758 	if (!mls_dominate_effective(obj, subj) ||
1759 	    !mls_dominate_effective(subj, obj))
1760 		return (EACCES);
1761 
1762 	return (0);
1763 }
1764 
1765 static int
1766 mls_system_check_swapon(struct ucred *cred, struct vnode *vp,
1767     struct label *vplabel)
1768 {
1769 	struct mac_mls *subj, *obj;
1770 
1771 	if (!mls_enabled)
1772 		return (0);
1773 
1774 	subj = SLOT(cred->cr_label);
1775 	obj = SLOT(vplabel);
1776 
1777 	if (!mls_dominate_effective(obj, subj) ||
1778 	    !mls_dominate_effective(subj, obj))
1779 		return (EACCES);
1780 
1781 	return (0);
1782 }
1783 
1784 static void
1785 mls_sysvmsg_cleanup(struct label *msglabel)
1786 {
1787 
1788 	bzero(SLOT(msglabel), sizeof(struct mac_mls));
1789 }
1790 
1791 static void
1792 mls_sysvmsg_create(struct ucred *cred, struct msqid_kernel *msqkptr,
1793     struct label *msqlabel, struct msg *msgptr, struct label *msglabel)
1794 {
1795 	struct mac_mls *source, *dest;
1796 
1797 	/* Ignore the msgq label. */
1798 	source = SLOT(cred->cr_label);
1799 	dest = SLOT(msglabel);
1800 
1801 	mls_copy_effective(source, dest);
1802 }
1803 
1804 static int
1805 mls_sysvmsq_check_msgrcv(struct ucred *cred, struct msg *msgptr,
1806     struct label *msglabel)
1807 {
1808 	struct mac_mls *subj, *obj;
1809 
1810 	if (!mls_enabled)
1811 		return (0);
1812 
1813 	subj = SLOT(cred->cr_label);
1814 	obj = SLOT(msglabel);
1815 
1816 	if (!mls_dominate_effective(subj, obj))
1817 		return (EACCES);
1818 
1819 	return (0);
1820 }
1821 
1822 static int
1823 mls_sysvmsq_check_msgrmid(struct ucred *cred, struct msg *msgptr,
1824     struct label *msglabel)
1825 {
1826 	struct mac_mls *subj, *obj;
1827 
1828 	if (!mls_enabled)
1829 		return (0);
1830 
1831 	subj = SLOT(cred->cr_label);
1832 	obj = SLOT(msglabel);
1833 
1834 	if (!mls_dominate_effective(obj, subj))
1835 		return (EACCES);
1836 
1837 	return (0);
1838 }
1839 
1840 static int
1841 mls_sysvmsq_check_msqget(struct ucred *cred, struct msqid_kernel *msqkptr,
1842     struct label *msqklabel)
1843 {
1844 	struct mac_mls *subj, *obj;
1845 
1846 	if (!mls_enabled)
1847 		return (0);
1848 
1849 	subj = SLOT(cred->cr_label);
1850 	obj = SLOT(msqklabel);
1851 
1852 	if (!mls_dominate_effective(subj, obj))
1853 		return (EACCES);
1854 
1855 	return (0);
1856 }
1857 
1858 static int
1859 mls_sysvmsq_check_msqsnd(struct ucred *cred, struct msqid_kernel *msqkptr,
1860     struct label *msqklabel)
1861 {
1862 	struct mac_mls *subj, *obj;
1863 
1864 	if (!mls_enabled)
1865 		return (0);
1866 
1867 	subj = SLOT(cred->cr_label);
1868 	obj = SLOT(msqklabel);
1869 
1870 	if (!mls_dominate_effective(obj, subj))
1871 		return (EACCES);
1872 
1873 	return (0);
1874 }
1875 
1876 static int
1877 mls_sysvmsq_check_msqrcv(struct ucred *cred, struct msqid_kernel *msqkptr,
1878     struct label *msqklabel)
1879 {
1880 	struct mac_mls *subj, *obj;
1881 
1882 	if (!mls_enabled)
1883 		return (0);
1884 
1885 	subj = SLOT(cred->cr_label);
1886 	obj = SLOT(msqklabel);
1887 
1888 	if (!mls_dominate_effective(subj, obj))
1889 		return (EACCES);
1890 
1891 	return (0);
1892 }
1893 
1894 static int
1895 mls_sysvmsq_check_msqctl(struct ucred *cred, struct msqid_kernel *msqkptr,
1896     struct label *msqklabel, int cmd)
1897 {
1898 	struct mac_mls *subj, *obj;
1899 
1900 	if (!mls_enabled)
1901 		return (0);
1902 
1903 	subj = SLOT(cred->cr_label);
1904 	obj = SLOT(msqklabel);
1905 
1906 	switch(cmd) {
1907 	case IPC_RMID:
1908 	case IPC_SET:
1909 		if (!mls_dominate_effective(obj, subj))
1910 			return (EACCES);
1911 		break;
1912 
1913 	case IPC_STAT:
1914 		if (!mls_dominate_effective(subj, obj))
1915 			return (EACCES);
1916 		break;
1917 
1918 	default:
1919 		return (EACCES);
1920 	}
1921 
1922 	return (0);
1923 }
1924 
1925 static void
1926 mls_sysvmsq_cleanup(struct label *msqlabel)
1927 {
1928 
1929 	bzero(SLOT(msqlabel), sizeof(struct mac_mls));
1930 }
1931 
1932 static void
1933 mls_sysvmsq_create(struct ucred *cred, struct msqid_kernel *msqkptr,
1934     struct label *msqlabel)
1935 {
1936 	struct mac_mls *source, *dest;
1937 
1938 	source = SLOT(cred->cr_label);
1939 	dest = SLOT(msqlabel);
1940 
1941 	mls_copy_effective(source, dest);
1942 }
1943 
1944 static int
1945 mls_sysvsem_check_semctl(struct ucred *cred, struct semid_kernel *semakptr,
1946     struct label *semaklabel, int cmd)
1947 {
1948 	struct mac_mls *subj, *obj;
1949 
1950 	if (!mls_enabled)
1951 		return (0);
1952 
1953 	subj = SLOT(cred->cr_label);
1954 	obj = SLOT(semaklabel);
1955 
1956 	switch(cmd) {
1957 	case IPC_RMID:
1958 	case IPC_SET:
1959 	case SETVAL:
1960 	case SETALL:
1961 		if (!mls_dominate_effective(obj, subj))
1962 			return (EACCES);
1963 		break;
1964 
1965 	case IPC_STAT:
1966 	case GETVAL:
1967 	case GETPID:
1968 	case GETNCNT:
1969 	case GETZCNT:
1970 	case GETALL:
1971 		if (!mls_dominate_effective(subj, obj))
1972 			return (EACCES);
1973 		break;
1974 
1975 	default:
1976 		return (EACCES);
1977 	}
1978 
1979 	return (0);
1980 }
1981 
1982 static int
1983 mls_sysvsem_check_semget(struct ucred *cred, struct semid_kernel *semakptr,
1984     struct label *semaklabel)
1985 {
1986 	struct mac_mls *subj, *obj;
1987 
1988 	if (!mls_enabled)
1989 		return (0);
1990 
1991 	subj = SLOT(cred->cr_label);
1992 	obj = SLOT(semaklabel);
1993 
1994 	if (!mls_dominate_effective(subj, obj))
1995 		return (EACCES);
1996 
1997 	return (0);
1998 }
1999 
2000 static int
2001 mls_sysvsem_check_semop(struct ucred *cred, struct semid_kernel *semakptr,
2002     struct label *semaklabel, size_t accesstype)
2003 {
2004 	struct mac_mls *subj, *obj;
2005 
2006 	if (!mls_enabled)
2007 		return (0);
2008 
2009 	subj = SLOT(cred->cr_label);
2010 	obj = SLOT(semaklabel);
2011 
2012 	if( accesstype & SEM_R )
2013 		if (!mls_dominate_effective(subj, obj))
2014 			return (EACCES);
2015 
2016 	if( accesstype & SEM_A )
2017 		if (!mls_dominate_effective(obj, subj))
2018 			return (EACCES);
2019 
2020 	return (0);
2021 }
2022 
2023 static void
2024 mls_sysvsem_cleanup(struct label *semalabel)
2025 {
2026 
2027 	bzero(SLOT(semalabel), sizeof(struct mac_mls));
2028 }
2029 
2030 static void
2031 mls_sysvsem_create(struct ucred *cred, struct semid_kernel *semakptr,
2032     struct label *semalabel)
2033 {
2034 	struct mac_mls *source, *dest;
2035 
2036 	source = SLOT(cred->cr_label);
2037 	dest = SLOT(semalabel);
2038 
2039 	mls_copy_effective(source, dest);
2040 }
2041 
2042 static int
2043 mls_sysvshm_check_shmat(struct ucred *cred, struct shmid_kernel *shmsegptr,
2044     struct label *shmseglabel, int shmflg)
2045 {
2046 	struct mac_mls *subj, *obj;
2047 
2048 	if (!mls_enabled)
2049 		return (0);
2050 
2051 	subj = SLOT(cred->cr_label);
2052 	obj = SLOT(shmseglabel);
2053 
2054 	if (!mls_dominate_effective(subj, obj))
2055 		return (EACCES);
2056 	if ((shmflg & SHM_RDONLY) == 0) {
2057 		if (!mls_dominate_effective(obj, subj))
2058 			return (EACCES);
2059 	}
2060 
2061 	return (0);
2062 }
2063 
2064 static int
2065 mls_sysvshm_check_shmctl(struct ucred *cred, struct shmid_kernel *shmsegptr,
2066     struct label *shmseglabel, int cmd)
2067 {
2068 	struct mac_mls *subj, *obj;
2069 
2070 	if (!mls_enabled)
2071 		return (0);
2072 
2073 	subj = SLOT(cred->cr_label);
2074 	obj = SLOT(shmseglabel);
2075 
2076 	switch(cmd) {
2077 	case IPC_RMID:
2078 	case IPC_SET:
2079 		if (!mls_dominate_effective(obj, subj))
2080 			return (EACCES);
2081 		break;
2082 
2083 	case IPC_STAT:
2084 	case SHM_STAT:
2085 		if (!mls_dominate_effective(subj, obj))
2086 			return (EACCES);
2087 		break;
2088 
2089 	default:
2090 		return (EACCES);
2091 	}
2092 
2093 	return (0);
2094 }
2095 
2096 static int
2097 mls_sysvshm_check_shmget(struct ucred *cred, struct shmid_kernel *shmsegptr,
2098     struct label *shmseglabel, int shmflg)
2099 {
2100 	struct mac_mls *subj, *obj;
2101 
2102 	if (!mls_enabled)
2103 		return (0);
2104 
2105 	subj = SLOT(cred->cr_label);
2106 	obj = SLOT(shmseglabel);
2107 
2108 	if (!mls_dominate_effective(obj, subj))
2109 		return (EACCES);
2110 
2111 	return (0);
2112 }
2113 
2114 static void
2115 mls_sysvshm_cleanup(struct label *shmlabel)
2116 {
2117 
2118 	bzero(SLOT(shmlabel), sizeof(struct mac_mls));
2119 }
2120 
2121 static void
2122 mls_sysvshm_create(struct ucred *cred, struct shmid_kernel *shmsegptr,
2123     struct label *shmlabel)
2124 {
2125 	struct mac_mls *source, *dest;
2126 
2127 	source = SLOT(cred->cr_label);
2128 	dest = SLOT(shmlabel);
2129 
2130 	mls_copy_effective(source, dest);
2131 }
2132 
2133 static int
2134 mls_vnode_associate_extattr(struct mount *mp, struct label *mplabel,
2135     struct vnode *vp, struct label *vplabel)
2136 {
2137 	struct mac_mls mm_temp, *source, *dest;
2138 	int buflen, error;
2139 
2140 	source = SLOT(mplabel);
2141 	dest = SLOT(vplabel);
2142 
2143 	buflen = sizeof(mm_temp);
2144 	bzero(&mm_temp, buflen);
2145 
2146 	error = vn_extattr_get(vp, IO_NODELOCKED, MAC_MLS_EXTATTR_NAMESPACE,
2147 	    MAC_MLS_EXTATTR_NAME, &buflen, (char *) &mm_temp, curthread);
2148 	if (error == ENOATTR || error == EOPNOTSUPP) {
2149 		/* Fall back to the mntlabel. */
2150 		mls_copy_effective(source, dest);
2151 		return (0);
2152 	} else if (error)
2153 		return (error);
2154 
2155 	if (buflen != sizeof(mm_temp)) {
2156 		printf("mls_vnode_associate_extattr: bad size %d\n", buflen);
2157 		return (EPERM);
2158 	}
2159 	if (mls_valid(&mm_temp) != 0) {
2160 		printf("mls_vnode_associate_extattr: invalid\n");
2161 		return (EPERM);
2162 	}
2163 	if ((mm_temp.mm_flags & MAC_MLS_FLAGS_BOTH) !=
2164 	    MAC_MLS_FLAG_EFFECTIVE) {
2165 		printf("mls_associated_vnode_extattr: not effective\n");
2166 		return (EPERM);
2167 	}
2168 
2169 	mls_copy_effective(&mm_temp, dest);
2170 	return (0);
2171 }
2172 
2173 static void
2174 mls_vnode_associate_singlelabel(struct mount *mp, struct label *mplabel,
2175     struct vnode *vp, struct label *vplabel)
2176 {
2177 	struct mac_mls *source, *dest;
2178 
2179 	source = SLOT(mplabel);
2180 	dest = SLOT(vplabel);
2181 
2182 	mls_copy_effective(source, dest);
2183 }
2184 
2185 static int
2186 mls_vnode_check_chdir(struct ucred *cred, struct vnode *dvp,
2187     struct label *dvplabel)
2188 {
2189 	struct mac_mls *subj, *obj;
2190 
2191 	if (!mls_enabled)
2192 		return (0);
2193 
2194 	subj = SLOT(cred->cr_label);
2195 	obj = SLOT(dvplabel);
2196 
2197 	if (!mls_dominate_effective(subj, obj))
2198 		return (EACCES);
2199 
2200 	return (0);
2201 }
2202 
2203 static int
2204 mls_vnode_check_chroot(struct ucred *cred, struct vnode *dvp,
2205     struct label *dvplabel)
2206 {
2207 	struct mac_mls *subj, *obj;
2208 
2209 	if (!mls_enabled)
2210 		return (0);
2211 
2212 	subj = SLOT(cred->cr_label);
2213 	obj = SLOT(dvplabel);
2214 
2215 	if (!mls_dominate_effective(subj, obj))
2216 		return (EACCES);
2217 
2218 	return (0);
2219 }
2220 
2221 static int
2222 mls_vnode_check_create(struct ucred *cred, struct vnode *dvp,
2223     struct label *dvplabel, struct componentname *cnp, struct vattr *vap)
2224 {
2225 	struct mac_mls *subj, *obj;
2226 
2227 	if (!mls_enabled)
2228 		return (0);
2229 
2230 	subj = SLOT(cred->cr_label);
2231 	obj = SLOT(dvplabel);
2232 
2233 	if (!mls_dominate_effective(obj, subj))
2234 		return (EACCES);
2235 
2236 	return (0);
2237 }
2238 
2239 static int
2240 mls_vnode_check_deleteacl(struct ucred *cred, struct vnode *vp,
2241     struct label *vplabel, acl_type_t type)
2242 {
2243 	struct mac_mls *subj, *obj;
2244 
2245 	if (!mls_enabled)
2246 		return (0);
2247 
2248 	subj = SLOT(cred->cr_label);
2249 	obj = SLOT(vplabel);
2250 
2251 	if (!mls_dominate_effective(obj, subj))
2252 		return (EACCES);
2253 
2254 	return (0);
2255 }
2256 
2257 static int
2258 mls_vnode_check_deleteextattr(struct ucred *cred, struct vnode *vp,
2259     struct label *vplabel, int attrnamespace, const char *name)
2260 {
2261 	struct mac_mls *subj, *obj;
2262 
2263 	if (!mls_enabled)
2264 		return (0);
2265 
2266 	subj = SLOT(cred->cr_label);
2267 	obj = SLOT(vplabel);
2268 
2269 	if (!mls_dominate_effective(obj, subj))
2270 		return (EACCES);
2271 
2272 	return (0);
2273 }
2274 
2275 static int
2276 mls_vnode_check_exec(struct ucred *cred, struct vnode *vp,
2277     struct label *vplabel, struct image_params *imgp,
2278     struct label *execlabel)
2279 {
2280 	struct mac_mls *subj, *obj, *exec;
2281 	int error;
2282 
2283 	if (execlabel != NULL) {
2284 		/*
2285 		 * We currently don't permit labels to be changed at
2286 		 * exec-time as part of MLS, so disallow non-NULL MLS label
2287 		 * elements in the execlabel.
2288 		 */
2289 		exec = SLOT(execlabel);
2290 		error = mls_atmostflags(exec, 0);
2291 		if (error)
2292 			return (error);
2293 	}
2294 
2295 	if (!mls_enabled)
2296 		return (0);
2297 
2298 	subj = SLOT(cred->cr_label);
2299 	obj = SLOT(vplabel);
2300 
2301 	if (!mls_dominate_effective(subj, obj))
2302 		return (EACCES);
2303 
2304 	return (0);
2305 }
2306 
2307 static int
2308 mls_vnode_check_getacl(struct ucred *cred, struct vnode *vp,
2309     struct label *vplabel, acl_type_t type)
2310 {
2311 	struct mac_mls *subj, *obj;
2312 
2313 	if (!mls_enabled)
2314 		return (0);
2315 
2316 	subj = SLOT(cred->cr_label);
2317 	obj = SLOT(vplabel);
2318 
2319 	if (!mls_dominate_effective(subj, obj))
2320 		return (EACCES);
2321 
2322 	return (0);
2323 }
2324 
2325 static int
2326 mls_vnode_check_getextattr(struct ucred *cred, struct vnode *vp,
2327     struct label *vplabel, int attrnamespace, const char *name,
2328     struct uio *uio)
2329 {
2330 	struct mac_mls *subj, *obj;
2331 
2332 	if (!mls_enabled)
2333 		return (0);
2334 
2335 	subj = SLOT(cred->cr_label);
2336 	obj = SLOT(vplabel);
2337 
2338 	if (!mls_dominate_effective(subj, obj))
2339 		return (EACCES);
2340 
2341 	return (0);
2342 }
2343 
2344 static int
2345 mls_vnode_check_link(struct ucred *cred, struct vnode *dvp,
2346     struct label *dvplabel, struct vnode *vp, struct label *vplabel,
2347     struct componentname *cnp)
2348 {
2349 	struct mac_mls *subj, *obj;
2350 
2351 	if (!mls_enabled)
2352 		return (0);
2353 
2354 	subj = SLOT(cred->cr_label);
2355 	obj = SLOT(dvplabel);
2356 
2357 	if (!mls_dominate_effective(obj, subj))
2358 		return (EACCES);
2359 
2360 	obj = SLOT(vplabel);
2361 	if (!mls_dominate_effective(obj, subj))
2362 		return (EACCES);
2363 
2364 	return (0);
2365 }
2366 
2367 static int
2368 mls_vnode_check_listextattr(struct ucred *cred, struct vnode *vp,
2369     struct label *vplabel, int attrnamespace)
2370 {
2371 
2372 	struct mac_mls *subj, *obj;
2373 
2374 	if (!mls_enabled)
2375 		return (0);
2376 
2377 	subj = SLOT(cred->cr_label);
2378 	obj = SLOT(vplabel);
2379 
2380 	if (!mls_dominate_effective(subj, obj))
2381 		return (EACCES);
2382 
2383 	return (0);
2384 }
2385 
2386 static int
2387 mls_vnode_check_lookup(struct ucred *cred, struct vnode *dvp,
2388     struct label *dvplabel, struct componentname *cnp)
2389 {
2390 	struct mac_mls *subj, *obj;
2391 
2392 	if (!mls_enabled)
2393 		return (0);
2394 
2395 	subj = SLOT(cred->cr_label);
2396 	obj = SLOT(dvplabel);
2397 
2398 	if (!mls_dominate_effective(subj, obj))
2399 		return (EACCES);
2400 
2401 	return (0);
2402 }
2403 
2404 static int
2405 mls_vnode_check_mmap(struct ucred *cred, struct vnode *vp,
2406     struct label *vplabel, int prot, int flags)
2407 {
2408 	struct mac_mls *subj, *obj;
2409 
2410 	/*
2411 	 * Rely on the use of open()-time protections to handle
2412 	 * non-revocation cases.
2413 	 */
2414 	if (!mls_enabled || !revocation_enabled)
2415 		return (0);
2416 
2417 	subj = SLOT(cred->cr_label);
2418 	obj = SLOT(vplabel);
2419 
2420 	if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) {
2421 		if (!mls_dominate_effective(subj, obj))
2422 			return (EACCES);
2423 	}
2424 	if (((prot & VM_PROT_WRITE) != 0) && ((flags & MAP_SHARED) != 0)) {
2425 		if (!mls_dominate_effective(obj, subj))
2426 			return (EACCES);
2427 	}
2428 
2429 	return (0);
2430 }
2431 
2432 static int
2433 mls_vnode_check_open(struct ucred *cred, struct vnode *vp,
2434     struct label *vplabel, int acc_mode)
2435 {
2436 	struct mac_mls *subj, *obj;
2437 
2438 	if (!mls_enabled)
2439 		return (0);
2440 
2441 	subj = SLOT(cred->cr_label);
2442 	obj = SLOT(vplabel);
2443 
2444 	/* XXX privilege override for admin? */
2445 	if (acc_mode & (VREAD | VEXEC | VSTAT)) {
2446 		if (!mls_dominate_effective(subj, obj))
2447 			return (EACCES);
2448 	}
2449 	if (acc_mode & (VWRITE | VAPPEND | VADMIN)) {
2450 		if (!mls_dominate_effective(obj, subj))
2451 			return (EACCES);
2452 	}
2453 
2454 	return (0);
2455 }
2456 
2457 static int
2458 mls_vnode_check_poll(struct ucred *active_cred, struct ucred *file_cred,
2459     struct vnode *vp, struct label *vplabel)
2460 {
2461 	struct mac_mls *subj, *obj;
2462 
2463 	if (!mls_enabled || !revocation_enabled)
2464 		return (0);
2465 
2466 	subj = SLOT(active_cred->cr_label);
2467 	obj = SLOT(vplabel);
2468 
2469 	if (!mls_dominate_effective(subj, obj))
2470 		return (EACCES);
2471 
2472 	return (0);
2473 }
2474 
2475 static int
2476 mls_vnode_check_read(struct ucred *active_cred, struct ucred *file_cred,
2477     struct vnode *vp, struct label *vplabel)
2478 {
2479 	struct mac_mls *subj, *obj;
2480 
2481 	if (!mls_enabled || !revocation_enabled)
2482 		return (0);
2483 
2484 	subj = SLOT(active_cred->cr_label);
2485 	obj = SLOT(vplabel);
2486 
2487 	if (!mls_dominate_effective(subj, obj))
2488 		return (EACCES);
2489 
2490 	return (0);
2491 }
2492 
2493 static int
2494 mls_vnode_check_readdir(struct ucred *cred, struct vnode *dvp,
2495     struct label *dvplabel)
2496 {
2497 	struct mac_mls *subj, *obj;
2498 
2499 	if (!mls_enabled)
2500 		return (0);
2501 
2502 	subj = SLOT(cred->cr_label);
2503 	obj = SLOT(dvplabel);
2504 
2505 	if (!mls_dominate_effective(subj, obj))
2506 		return (EACCES);
2507 
2508 	return (0);
2509 }
2510 
2511 static int
2512 mls_vnode_check_readlink(struct ucred *cred, struct vnode *vp,
2513     struct label *vplabel)
2514 {
2515 	struct mac_mls *subj, *obj;
2516 
2517 	if (!mls_enabled)
2518 		return (0);
2519 
2520 	subj = SLOT(cred->cr_label);
2521 	obj = SLOT(vplabel);
2522 
2523 	if (!mls_dominate_effective(subj, obj))
2524 		return (EACCES);
2525 
2526 	return (0);
2527 }
2528 
2529 static int
2530 mls_vnode_check_relabel(struct ucred *cred, struct vnode *vp,
2531     struct label *vplabel, struct label *newlabel)
2532 {
2533 	struct mac_mls *old, *new, *subj;
2534 	int error;
2535 
2536 	old = SLOT(vplabel);
2537 	new = SLOT(newlabel);
2538 	subj = SLOT(cred->cr_label);
2539 
2540 	/*
2541 	 * If there is an MLS label update for the vnode, it must be a
2542 	 * effective label.
2543 	 */
2544 	error = mls_atmostflags(new, MAC_MLS_FLAG_EFFECTIVE);
2545 	if (error)
2546 		return (error);
2547 
2548 	/*
2549 	 * To perform a relabel of the vnode (MLS label or not), MLS must
2550 	 * authorize the relabel.
2551 	 */
2552 	if (!mls_effective_in_range(old, subj))
2553 		return (EPERM);
2554 
2555 	/*
2556 	 * If the MLS label is to be changed, authorize as appropriate.
2557 	 */
2558 	if (new->mm_flags & MAC_MLS_FLAG_EFFECTIVE) {
2559 		/*
2560 		 * To change the MLS label on a vnode, the new vnode label
2561 		 * must be in the subject range.
2562 		 */
2563 		if (!mls_effective_in_range(new, subj))
2564 			return (EPERM);
2565 
2566 		/*
2567 		 * To change the MLS label on the vnode to be EQUAL, the
2568 		 * subject must have appropriate privilege.
2569 		 */
2570 		if (mls_contains_equal(new)) {
2571 			error = mls_subject_privileged(subj);
2572 			if (error)
2573 				return (error);
2574 		}
2575 	}
2576 
2577 	return (0);
2578 }
2579 
2580 static int
2581 mls_vnode_check_rename_from(struct ucred *cred, struct vnode *dvp,
2582     struct label *dvplabel, struct vnode *vp, struct label *vplabel,
2583     struct componentname *cnp)
2584 {
2585 	struct mac_mls *subj, *obj;
2586 
2587 	if (!mls_enabled)
2588 		return (0);
2589 
2590 	subj = SLOT(cred->cr_label);
2591 	obj = SLOT(dvplabel);
2592 
2593 	if (!mls_dominate_effective(obj, subj))
2594 		return (EACCES);
2595 
2596 	obj = SLOT(vplabel);
2597 
2598 	if (!mls_dominate_effective(obj, subj))
2599 		return (EACCES);
2600 
2601 	return (0);
2602 }
2603 
2604 static int
2605 mls_vnode_check_rename_to(struct ucred *cred, struct vnode *dvp,
2606     struct label *dvplabel, struct vnode *vp, struct label *vplabel,
2607     int samedir, struct componentname *cnp)
2608 {
2609 	struct mac_mls *subj, *obj;
2610 
2611 	if (!mls_enabled)
2612 		return (0);
2613 
2614 	subj = SLOT(cred->cr_label);
2615 	obj = SLOT(dvplabel);
2616 
2617 	if (!mls_dominate_effective(obj, subj))
2618 		return (EACCES);
2619 
2620 	if (vp != NULL) {
2621 		obj = SLOT(vplabel);
2622 
2623 		if (!mls_dominate_effective(obj, subj))
2624 			return (EACCES);
2625 	}
2626 
2627 	return (0);
2628 }
2629 
2630 static int
2631 mls_vnode_check_revoke(struct ucred *cred, struct vnode *vp,
2632     struct label *vplabel)
2633 {
2634 	struct mac_mls *subj, *obj;
2635 
2636 	if (!mls_enabled)
2637 		return (0);
2638 
2639 	subj = SLOT(cred->cr_label);
2640 	obj = SLOT(vplabel);
2641 
2642 	if (!mls_dominate_effective(obj, subj))
2643 		return (EACCES);
2644 
2645 	return (0);
2646 }
2647 
2648 static int
2649 mls_vnode_check_setacl(struct ucred *cred, struct vnode *vp,
2650     struct label *vplabel, acl_type_t type, struct acl *acl)
2651 {
2652 	struct mac_mls *subj, *obj;
2653 
2654 	if (!mls_enabled)
2655 		return (0);
2656 
2657 	subj = SLOT(cred->cr_label);
2658 	obj = SLOT(vplabel);
2659 
2660 	if (!mls_dominate_effective(obj, subj))
2661 		return (EACCES);
2662 
2663 	return (0);
2664 }
2665 
2666 static int
2667 mls_vnode_check_setextattr(struct ucred *cred, struct vnode *vp,
2668     struct label *vplabel, int attrnamespace, const char *name,
2669     struct uio *uio)
2670 {
2671 	struct mac_mls *subj, *obj;
2672 
2673 	if (!mls_enabled)
2674 		return (0);
2675 
2676 	subj = SLOT(cred->cr_label);
2677 	obj = SLOT(vplabel);
2678 
2679 	if (!mls_dominate_effective(obj, subj))
2680 		return (EACCES);
2681 
2682 	/* XXX: protect the MAC EA in a special way? */
2683 
2684 	return (0);
2685 }
2686 
2687 static int
2688 mls_vnode_check_setflags(struct ucred *cred, struct vnode *vp,
2689     struct label *vplabel, u_long flags)
2690 {
2691 	struct mac_mls *subj, *obj;
2692 
2693 	if (!mls_enabled)
2694 		return (0);
2695 
2696 	subj = SLOT(cred->cr_label);
2697 	obj = SLOT(vplabel);
2698 
2699 	if (!mls_dominate_effective(obj, subj))
2700 		return (EACCES);
2701 
2702 	return (0);
2703 }
2704 
2705 static int
2706 mls_vnode_check_setmode(struct ucred *cred, struct vnode *vp,
2707     struct label *vplabel, mode_t mode)
2708 {
2709 	struct mac_mls *subj, *obj;
2710 
2711 	if (!mls_enabled)
2712 		return (0);
2713 
2714 	subj = SLOT(cred->cr_label);
2715 	obj = SLOT(vplabel);
2716 
2717 	if (!mls_dominate_effective(obj, subj))
2718 		return (EACCES);
2719 
2720 	return (0);
2721 }
2722 
2723 static int
2724 mls_vnode_check_setowner(struct ucred *cred, struct vnode *vp,
2725     struct label *vplabel, uid_t uid, gid_t gid)
2726 {
2727 	struct mac_mls *subj, *obj;
2728 
2729 	if (!mls_enabled)
2730 		return (0);
2731 
2732 	subj = SLOT(cred->cr_label);
2733 	obj = SLOT(vplabel);
2734 
2735 	if (!mls_dominate_effective(obj, subj))
2736 		return (EACCES);
2737 
2738 	return (0);
2739 }
2740 
2741 static int
2742 mls_vnode_check_setutimes(struct ucred *cred, struct vnode *vp,
2743     struct label *vplabel, struct timespec atime, struct timespec mtime)
2744 {
2745 	struct mac_mls *subj, *obj;
2746 
2747 	if (!mls_enabled)
2748 		return (0);
2749 
2750 	subj = SLOT(cred->cr_label);
2751 	obj = SLOT(vplabel);
2752 
2753 	if (!mls_dominate_effective(obj, subj))
2754 		return (EACCES);
2755 
2756 	return (0);
2757 }
2758 
2759 static int
2760 mls_vnode_check_stat(struct ucred *active_cred, struct ucred *file_cred,
2761     struct vnode *vp, struct label *vplabel)
2762 {
2763 	struct mac_mls *subj, *obj;
2764 
2765 	if (!mls_enabled)
2766 		return (0);
2767 
2768 	subj = SLOT(active_cred->cr_label);
2769 	obj = SLOT(vplabel);
2770 
2771 	if (!mls_dominate_effective(subj, obj))
2772 		return (EACCES);
2773 
2774 	return (0);
2775 }
2776 
2777 static int
2778 mls_vnode_check_unlink(struct ucred *cred, struct vnode *dvp,
2779     struct label *dvplabel, struct vnode *vp, struct label *vplabel,
2780     struct componentname *cnp)
2781 {
2782 	struct mac_mls *subj, *obj;
2783 
2784 	if (!mls_enabled)
2785 		return (0);
2786 
2787 	subj = SLOT(cred->cr_label);
2788 	obj = SLOT(dvplabel);
2789 
2790 	if (!mls_dominate_effective(obj, subj))
2791 		return (EACCES);
2792 
2793 	obj = SLOT(vplabel);
2794 
2795 	if (!mls_dominate_effective(obj, subj))
2796 		return (EACCES);
2797 
2798 	return (0);
2799 }
2800 
2801 static int
2802 mls_vnode_check_write(struct ucred *active_cred, struct ucred *file_cred,
2803     struct vnode *vp, struct label *vplabel)
2804 {
2805 	struct mac_mls *subj, *obj;
2806 
2807 	if (!mls_enabled || !revocation_enabled)
2808 		return (0);
2809 
2810 	subj = SLOT(active_cred->cr_label);
2811 	obj = SLOT(vplabel);
2812 
2813 	if (!mls_dominate_effective(obj, subj))
2814 		return (EACCES);
2815 
2816 	return (0);
2817 }
2818 
2819 static int
2820 mls_vnode_create_extattr(struct ucred *cred, struct mount *mp,
2821     struct label *mplabel, struct vnode *dvp, struct label *dvplabel,
2822     struct vnode *vp, struct label *vplabel, struct componentname *cnp)
2823 {
2824 	struct mac_mls *source, *dest, mm_temp;
2825 	size_t buflen;
2826 	int error;
2827 
2828 	buflen = sizeof(mm_temp);
2829 	bzero(&mm_temp, buflen);
2830 
2831 	source = SLOT(cred->cr_label);
2832 	dest = SLOT(vplabel);
2833 	mls_copy_effective(source, &mm_temp);
2834 
2835 	error = vn_extattr_set(vp, IO_NODELOCKED, MAC_MLS_EXTATTR_NAMESPACE,
2836 	    MAC_MLS_EXTATTR_NAME, buflen, (char *) &mm_temp, curthread);
2837 	if (error == 0)
2838 		mls_copy_effective(source, dest);
2839 	return (error);
2840 }
2841 
2842 static void
2843 mls_vnode_relabel(struct ucred *cred, struct vnode *vp,
2844     struct label *vplabel, struct label *label)
2845 {
2846 	struct mac_mls *source, *dest;
2847 
2848 	source = SLOT(label);
2849 	dest = SLOT(vplabel);
2850 
2851 	mls_copy(source, dest);
2852 }
2853 
2854 static int
2855 mls_vnode_setlabel_extattr(struct ucred *cred, struct vnode *vp,
2856     struct label *vplabel, struct label *intlabel)
2857 {
2858 	struct mac_mls *source, mm_temp;
2859 	size_t buflen;
2860 	int error;
2861 
2862 	buflen = sizeof(mm_temp);
2863 	bzero(&mm_temp, buflen);
2864 
2865 	source = SLOT(intlabel);
2866 	if ((source->mm_flags & MAC_MLS_FLAG_EFFECTIVE) == 0)
2867 		return (0);
2868 
2869 	mls_copy_effective(source, &mm_temp);
2870 
2871 	error = vn_extattr_set(vp, IO_NODELOCKED, MAC_MLS_EXTATTR_NAMESPACE,
2872 	    MAC_MLS_EXTATTR_NAME, buflen, (char *) &mm_temp, curthread);
2873 	return (error);
2874 }
2875 
2876 static struct mac_policy_ops mls_ops =
2877 {
2878 	.mpo_init = mls_init,
2879 
2880 	.mpo_bpfdesc_check_receive = mls_bpfdesc_check_receive,
2881 	.mpo_bpfdesc_create = mls_bpfdesc_create,
2882 	.mpo_bpfdesc_create_mbuf = mls_bpfdesc_create_mbuf,
2883 	.mpo_bpfdesc_destroy_label = mls_destroy_label,
2884 	.mpo_bpfdesc_init_label = mls_init_label,
2885 
2886 	.mpo_cred_check_relabel = mls_cred_check_relabel,
2887 	.mpo_cred_check_visible = mls_cred_check_visible,
2888 	.mpo_cred_copy_label = mls_copy_label,
2889 	.mpo_cred_destroy_label = mls_destroy_label,
2890 	.mpo_cred_externalize_label = mls_externalize_label,
2891 	.mpo_cred_init_label = mls_init_label,
2892 	.mpo_cred_internalize_label = mls_internalize_label,
2893 	.mpo_cred_relabel = mls_cred_relabel,
2894 
2895 	.mpo_devfs_create_device = mls_devfs_create_device,
2896 	.mpo_devfs_create_directory = mls_devfs_create_directory,
2897 	.mpo_devfs_create_symlink = mls_devfs_create_symlink,
2898 	.mpo_devfs_destroy_label = mls_destroy_label,
2899 	.mpo_devfs_init_label = mls_init_label,
2900 	.mpo_devfs_update = mls_devfs_update,
2901 	.mpo_devfs_vnode_associate = mls_devfs_vnode_associate,
2902 
2903 	.mpo_ifnet_check_relabel = mls_ifnet_check_relabel,
2904 	.mpo_ifnet_check_transmit = mls_ifnet_check_transmit,
2905 	.mpo_ifnet_copy_label = mls_copy_label,
2906 	.mpo_ifnet_create = mls_ifnet_create,
2907 	.mpo_ifnet_create_mbuf = mls_ifnet_create_mbuf,
2908 	.mpo_ifnet_destroy_label = mls_destroy_label,
2909 	.mpo_ifnet_externalize_label = mls_externalize_label,
2910 	.mpo_ifnet_init_label = mls_init_label,
2911 	.mpo_ifnet_internalize_label = mls_internalize_label,
2912 	.mpo_ifnet_relabel = mls_ifnet_relabel,
2913 
2914 	.mpo_inpcb_check_deliver = mls_inpcb_check_deliver,
2915 	.mpo_inpcb_create = mls_inpcb_create,
2916 	.mpo_inpcb_create_mbuf = mls_inpcb_create_mbuf,
2917 	.mpo_inpcb_destroy_label = mls_destroy_label,
2918 	.mpo_inpcb_init_label = mls_init_label_waitcheck,
2919 	.mpo_inpcb_sosetlabel = mls_inpcb_sosetlabel,
2920 
2921 	.mpo_ipq_create = mls_ipq_create,
2922 	.mpo_ipq_destroy_label = mls_destroy_label,
2923 	.mpo_ipq_init_label = mls_init_label_waitcheck,
2924 	.mpo_ipq_match = mls_ipq_match,
2925 	.mpo_ipq_reassemble = mls_ipq_reassemble,
2926 	.mpo_ipq_update = mls_ipq_update,
2927 
2928 	.mpo_mbuf_copy_label = mls_copy_label,
2929 	.mpo_mbuf_destroy_label = mls_destroy_label,
2930 	.mpo_mbuf_init_label = mls_init_label_waitcheck,
2931 
2932 	.mpo_mount_check_stat = mls_mount_check_stat,
2933 	.mpo_mount_create = mls_mount_create,
2934 	.mpo_mount_destroy_label = mls_destroy_label,
2935 	.mpo_mount_init_label = mls_init_label,
2936 
2937 	.mpo_netatalk_aarp_send = mls_netatalk_aarp_send,
2938 
2939 	.mpo_netinet_arp_send = mls_netinet_arp_send,
2940 	.mpo_netinet_firewall_reply = mls_netinet_firewall_reply,
2941 	.mpo_netinet_firewall_send = mls_netinet_firewall_send,
2942 	.mpo_netinet_fragment = mls_netinet_fragment,
2943 	.mpo_netinet_icmp_reply = mls_netinet_icmp_reply,
2944 	.mpo_netinet_igmp_send = mls_netinet_igmp_send,
2945 
2946 	.mpo_netinet6_nd6_send = mls_netinet6_nd6_send,
2947 
2948 	.mpo_pipe_check_ioctl = mls_pipe_check_ioctl,
2949 	.mpo_pipe_check_poll = mls_pipe_check_poll,
2950 	.mpo_pipe_check_read = mls_pipe_check_read,
2951 	.mpo_pipe_check_relabel = mls_pipe_check_relabel,
2952 	.mpo_pipe_check_stat = mls_pipe_check_stat,
2953 	.mpo_pipe_check_write = mls_pipe_check_write,
2954 	.mpo_pipe_copy_label = mls_copy_label,
2955 	.mpo_pipe_create = mls_pipe_create,
2956 	.mpo_pipe_destroy_label = mls_destroy_label,
2957 	.mpo_pipe_externalize_label = mls_externalize_label,
2958 	.mpo_pipe_init_label = mls_init_label,
2959 	.mpo_pipe_internalize_label = mls_internalize_label,
2960 	.mpo_pipe_relabel = mls_pipe_relabel,
2961 
2962 	.mpo_posixsem_check_destroy = mls_posixsem_check_write,
2963 	.mpo_posixsem_check_getvalue = mls_posixsem_check_rdonly,
2964 	.mpo_posixsem_check_open = mls_posixsem_check_write,
2965 	.mpo_posixsem_check_post = mls_posixsem_check_write,
2966 	.mpo_posixsem_check_unlink = mls_posixsem_check_write,
2967 	.mpo_posixsem_check_wait = mls_posixsem_check_write,
2968 	.mpo_posixsem_create = mls_posixsem_create,
2969 	.mpo_posixsem_destroy_label = mls_destroy_label,
2970 	.mpo_posixsem_init_label = mls_init_label,
2971 
2972 	.mpo_proc_associate_nfsd = mls_proc_associate_nfsd,
2973 	.mpo_proc_check_debug = mls_proc_check_debug,
2974 	.mpo_proc_check_sched = mls_proc_check_sched,
2975 	.mpo_proc_check_signal = mls_proc_check_signal,
2976 	.mpo_proc_create_init = mls_proc_create_init,
2977 	.mpo_proc_create_swapper = mls_proc_create_swapper,
2978 
2979 	.mpo_socket_check_deliver = mls_socket_check_deliver,
2980 	.mpo_socket_check_relabel = mls_socket_check_relabel,
2981 	.mpo_socket_check_visible = mls_socket_check_visible,
2982 	.mpo_socket_copy_label = mls_copy_label,
2983 	.mpo_socket_create = mls_socket_create,
2984 	.mpo_socket_create_mbuf = mls_socket_create_mbuf,
2985 	.mpo_socket_destroy_label = mls_destroy_label,
2986 	.mpo_socket_externalize_label = mls_externalize_label,
2987 	.mpo_socket_init_label = mls_init_label_waitcheck,
2988 	.mpo_socket_internalize_label = mls_internalize_label,
2989 	.mpo_socket_newconn = mls_socket_newconn,
2990 	.mpo_socket_relabel = mls_socket_relabel,
2991 
2992 	.mpo_socketpeer_destroy_label = mls_destroy_label,
2993 	.mpo_socketpeer_externalize_label = mls_externalize_label,
2994 	.mpo_socketpeer_init_label = mls_init_label_waitcheck,
2995 	.mpo_socketpeer_set_from_mbuf = mls_socketpeer_set_from_mbuf,
2996 	.mpo_socketpeer_set_from_socket = mls_socketpeer_set_from_socket,
2997 
2998 	.mpo_syncache_create = mls_syncache_create,
2999 	.mpo_syncache_create_mbuf = mls_syncache_create_mbuf,
3000 	.mpo_syncache_destroy_label = mls_destroy_label,
3001 	.mpo_syncache_init_label = mls_init_label_waitcheck,
3002 
3003 	.mpo_sysvmsg_cleanup = mls_sysvmsg_cleanup,
3004 	.mpo_sysvmsg_create = mls_sysvmsg_create,
3005 	.mpo_sysvmsg_destroy_label = mls_destroy_label,
3006 	.mpo_sysvmsg_init_label = mls_init_label,
3007 
3008 	.mpo_sysvmsq_check_msgrcv = mls_sysvmsq_check_msgrcv,
3009 	.mpo_sysvmsq_check_msgrmid = mls_sysvmsq_check_msgrmid,
3010 	.mpo_sysvmsq_check_msqget = mls_sysvmsq_check_msqget,
3011 	.mpo_sysvmsq_check_msqsnd = mls_sysvmsq_check_msqsnd,
3012 	.mpo_sysvmsq_check_msqrcv = mls_sysvmsq_check_msqrcv,
3013 	.mpo_sysvmsq_check_msqctl = mls_sysvmsq_check_msqctl,
3014 	.mpo_sysvmsq_cleanup = mls_sysvmsq_cleanup,
3015 	.mpo_sysvmsq_destroy_label = mls_destroy_label,
3016 	.mpo_sysvmsq_init_label = mls_init_label,
3017 	.mpo_sysvmsq_create = mls_sysvmsq_create,
3018 
3019 	.mpo_sysvsem_check_semctl = mls_sysvsem_check_semctl,
3020 	.mpo_sysvsem_check_semget = mls_sysvsem_check_semget,
3021 	.mpo_sysvsem_check_semop = mls_sysvsem_check_semop,
3022 	.mpo_sysvsem_cleanup = mls_sysvsem_cleanup,
3023 	.mpo_sysvsem_create = mls_sysvsem_create,
3024 	.mpo_sysvsem_destroy_label = mls_destroy_label,
3025 	.mpo_sysvsem_init_label = mls_init_label,
3026 
3027 	.mpo_sysvshm_check_shmat = mls_sysvshm_check_shmat,
3028 	.mpo_sysvshm_check_shmctl = mls_sysvshm_check_shmctl,
3029 	.mpo_sysvshm_check_shmget = mls_sysvshm_check_shmget,
3030 	.mpo_sysvshm_cleanup = mls_sysvshm_cleanup,
3031 	.mpo_sysvshm_create = mls_sysvshm_create,
3032 	.mpo_sysvshm_destroy_label = mls_destroy_label,
3033 	.mpo_sysvshm_init_label = mls_init_label,
3034 
3035 
3036 	.mpo_system_check_acct = mls_system_check_acct,
3037 	.mpo_system_check_auditctl = mls_system_check_auditctl,
3038 	.mpo_system_check_swapon = mls_system_check_swapon,
3039 
3040 	.mpo_vnode_associate_extattr = mls_vnode_associate_extattr,
3041 	.mpo_vnode_associate_singlelabel = mls_vnode_associate_singlelabel,
3042 	.mpo_vnode_check_access = mls_vnode_check_open,
3043 	.mpo_vnode_check_chdir = mls_vnode_check_chdir,
3044 	.mpo_vnode_check_chroot = mls_vnode_check_chroot,
3045 	.mpo_vnode_check_create = mls_vnode_check_create,
3046 	.mpo_vnode_check_deleteacl = mls_vnode_check_deleteacl,
3047 	.mpo_vnode_check_deleteextattr = mls_vnode_check_deleteextattr,
3048 	.mpo_vnode_check_exec = mls_vnode_check_exec,
3049 	.mpo_vnode_check_getacl = mls_vnode_check_getacl,
3050 	.mpo_vnode_check_getextattr = mls_vnode_check_getextattr,
3051 	.mpo_vnode_check_link = mls_vnode_check_link,
3052 	.mpo_vnode_check_listextattr = mls_vnode_check_listextattr,
3053 	.mpo_vnode_check_lookup = mls_vnode_check_lookup,
3054 	.mpo_vnode_check_mmap = mls_vnode_check_mmap,
3055 	.mpo_vnode_check_open = mls_vnode_check_open,
3056 	.mpo_vnode_check_poll = mls_vnode_check_poll,
3057 	.mpo_vnode_check_read = mls_vnode_check_read,
3058 	.mpo_vnode_check_readdir = mls_vnode_check_readdir,
3059 	.mpo_vnode_check_readlink = mls_vnode_check_readlink,
3060 	.mpo_vnode_check_relabel = mls_vnode_check_relabel,
3061 	.mpo_vnode_check_rename_from = mls_vnode_check_rename_from,
3062 	.mpo_vnode_check_rename_to = mls_vnode_check_rename_to,
3063 	.mpo_vnode_check_revoke = mls_vnode_check_revoke,
3064 	.mpo_vnode_check_setacl = mls_vnode_check_setacl,
3065 	.mpo_vnode_check_setextattr = mls_vnode_check_setextattr,
3066 	.mpo_vnode_check_setflags = mls_vnode_check_setflags,
3067 	.mpo_vnode_check_setmode = mls_vnode_check_setmode,
3068 	.mpo_vnode_check_setowner = mls_vnode_check_setowner,
3069 	.mpo_vnode_check_setutimes = mls_vnode_check_setutimes,
3070 	.mpo_vnode_check_stat = mls_vnode_check_stat,
3071 	.mpo_vnode_check_unlink = mls_vnode_check_unlink,
3072 	.mpo_vnode_check_write = mls_vnode_check_write,
3073 	.mpo_vnode_copy_label = mls_copy_label,
3074 	.mpo_vnode_create_extattr = mls_vnode_create_extattr,
3075 	.mpo_vnode_destroy_label = mls_destroy_label,
3076 	.mpo_vnode_externalize_label = mls_externalize_label,
3077 	.mpo_vnode_init_label = mls_init_label,
3078 	.mpo_vnode_internalize_label = mls_internalize_label,
3079 	.mpo_vnode_relabel = mls_vnode_relabel,
3080 	.mpo_vnode_setlabel_extattr = mls_vnode_setlabel_extattr,
3081 };
3082 
3083 MAC_POLICY_SET(&mls_ops, mac_mls, "TrustedBSD MAC/MLS",
3084     MPC_LOADTIME_FLAG_NOTLATE | MPC_LOADTIME_FLAG_LABELMBUFS, &mls_slot);
3085