1 /*-
2 * Copyright (c) 1999-2002, 2007-2011 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 * This software was developed at the University of Cambridge Computer
18 * Laboratory with support from a grant from Google, Inc.
19 *
20 * Redistribution and use in source and binary forms, with or without
21 * modification, are permitted provided that the following conditions
22 * are met:
23 * 1. Redistributions of source code must retain the above copyright
24 * notice, this list of conditions and the following disclaimer.
25 * 2. Redistributions in binary form must reproduce the above copyright
26 * notice, this list of conditions and the following disclaimer in the
27 * documentation and/or other materials provided with the distribution.
28 *
29 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
30 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
31 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
32 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
33 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
34 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
35 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
37 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
38 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
39 * SUCH DAMAGE.
40 */
41
42 /*
43 * Developed by the TrustedBSD Project.
44 *
45 * MLS fixed label mandatory confidentiality policy.
46 */
47
48 #include <sys/types.h>
49 #include <sys/param.h>
50 #include <sys/acl.h>
51 #include <sys/conf.h>
52 #include <sys/extattr.h>
53 #include <sys/kernel.h>
54 #include <sys/ksem.h>
55 #include <sys/mman.h>
56 #include <sys/malloc.h>
57 #include <sys/mount.h>
58 #include <sys/proc.h>
59 #include <sys/sbuf.h>
60 #include <sys/systm.h>
61 #include <sys/sysproto.h>
62 #include <sys/sysent.h>
63 #include <sys/systm.h>
64 #include <sys/vnode.h>
65 #include <sys/file.h>
66 #include <sys/socket.h>
67 #include <sys/socketvar.h>
68 #include <sys/pipe.h>
69 #include <sys/sx.h>
70 #include <sys/sysctl.h>
71 #include <sys/msg.h>
72 #include <sys/sem.h>
73 #include <sys/shm.h>
74
75 #include <fs/devfs/devfs.h>
76
77 #include <net/bpfdesc.h>
78 #include <net/if.h>
79 #include <net/if_types.h>
80 #include <net/if_var.h>
81
82 #include <netinet/in.h>
83 #include <netinet/in_pcb.h>
84 #include <netinet/ip_var.h>
85
86 #include <vm/uma.h>
87 #include <vm/vm.h>
88
89 #include <security/mac/mac_policy.h>
90 #include <security/mac_mls/mac_mls.h>
91
92 SYSCTL_DECL(_security_mac);
93
94 static SYSCTL_NODE(_security_mac, OID_AUTO, mls,
95 CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
96 "TrustedBSD mac_mls policy controls");
97
98 static int mls_label_size = sizeof(struct mac_mls);
99 SYSCTL_INT(_security_mac_mls, OID_AUTO, label_size, CTLFLAG_RD,
100 &mls_label_size, 0, "Size of struct mac_mls");
101
102 static int mls_enabled = 1;
103 SYSCTL_INT(_security_mac_mls, OID_AUTO, enabled, CTLFLAG_RWTUN, &mls_enabled, 0,
104 "Enforce MAC/MLS policy");
105
106 static int destroyed_not_inited;
107 SYSCTL_INT(_security_mac_mls, OID_AUTO, destroyed_not_inited, CTLFLAG_RD,
108 &destroyed_not_inited, 0, "Count of labels destroyed but not inited");
109
110 static int ptys_equal = 0;
111 SYSCTL_INT(_security_mac_mls, OID_AUTO, ptys_equal, CTLFLAG_RWTUN,
112 &ptys_equal, 0, "Label pty devices as mls/equal on create");
113
114 static int revocation_enabled = 0;
115 SYSCTL_INT(_security_mac_mls, OID_AUTO, revocation_enabled, CTLFLAG_RWTUN,
116 &revocation_enabled, 0, "Revoke access to objects on relabel");
117
118 static int max_compartments = MAC_MLS_MAX_COMPARTMENTS;
119 SYSCTL_INT(_security_mac_mls, OID_AUTO, max_compartments, CTLFLAG_RD,
120 &max_compartments, 0, "Maximum compartments the policy supports");
121
122 static int mls_slot;
123 #define SLOT(l) ((struct mac_mls *)mac_label_get((l), mls_slot))
124 #define SLOT_SET(l, val) mac_label_set((l), mls_slot, (uintptr_t)(val))
125
126 static uma_zone_t zone_mls;
127
128 static __inline int
mls_bit_set_empty(u_char * set)129 mls_bit_set_empty(u_char *set) {
130 int i;
131
132 for (i = 0; i < MAC_MLS_MAX_COMPARTMENTS >> 3; i++)
133 if (set[i] != 0)
134 return (0);
135 return (1);
136 }
137
138 static struct mac_mls *
mls_alloc(int flag)139 mls_alloc(int flag)
140 {
141
142 return (uma_zalloc(zone_mls, flag | M_ZERO));
143 }
144
145 static void
mls_free(struct mac_mls * mm)146 mls_free(struct mac_mls *mm)
147 {
148
149 if (mm != NULL)
150 uma_zfree(zone_mls, mm);
151 else
152 atomic_add_int(&destroyed_not_inited, 1);
153 }
154
155 static int
mls_atmostflags(struct mac_mls * mm,int flags)156 mls_atmostflags(struct mac_mls *mm, int flags)
157 {
158
159 if ((mm->mm_flags & flags) != mm->mm_flags)
160 return (EINVAL);
161 return (0);
162 }
163
164 static int
mls_dominate_element(struct mac_mls_element * a,struct mac_mls_element * b)165 mls_dominate_element(struct mac_mls_element *a, struct mac_mls_element *b)
166 {
167 int bit;
168
169 switch (a->mme_type) {
170 case MAC_MLS_TYPE_EQUAL:
171 case MAC_MLS_TYPE_HIGH:
172 return (1);
173
174 case MAC_MLS_TYPE_LOW:
175 switch (b->mme_type) {
176 case MAC_MLS_TYPE_LEVEL:
177 case MAC_MLS_TYPE_HIGH:
178 return (0);
179
180 case MAC_MLS_TYPE_EQUAL:
181 case MAC_MLS_TYPE_LOW:
182 return (1);
183
184 default:
185 panic("mls_dominate_element: b->mme_type invalid");
186 }
187
188 case MAC_MLS_TYPE_LEVEL:
189 switch (b->mme_type) {
190 case MAC_MLS_TYPE_EQUAL:
191 case MAC_MLS_TYPE_LOW:
192 return (1);
193
194 case MAC_MLS_TYPE_HIGH:
195 return (0);
196
197 case MAC_MLS_TYPE_LEVEL:
198 for (bit = 1; bit <= MAC_MLS_MAX_COMPARTMENTS; bit++)
199 if (!MAC_MLS_BIT_TEST(bit,
200 a->mme_compartments) &&
201 MAC_MLS_BIT_TEST(bit, b->mme_compartments))
202 return (0);
203 return (a->mme_level >= b->mme_level);
204
205 default:
206 panic("mls_dominate_element: b->mme_type invalid");
207 }
208
209 default:
210 panic("mls_dominate_element: a->mme_type invalid");
211 }
212
213 return (0);
214 }
215
216 static int
mls_range_in_range(struct mac_mls * rangea,struct mac_mls * rangeb)217 mls_range_in_range(struct mac_mls *rangea, struct mac_mls *rangeb)
218 {
219
220 return (mls_dominate_element(&rangeb->mm_rangehigh,
221 &rangea->mm_rangehigh) &&
222 mls_dominate_element(&rangea->mm_rangelow,
223 &rangeb->mm_rangelow));
224 }
225
226 static int
mls_effective_in_range(struct mac_mls * effective,struct mac_mls * range)227 mls_effective_in_range(struct mac_mls *effective, struct mac_mls *range)
228 {
229
230 KASSERT((effective->mm_flags & MAC_MLS_FLAG_EFFECTIVE) != 0,
231 ("mls_effective_in_range: a not effective"));
232 KASSERT((range->mm_flags & MAC_MLS_FLAG_RANGE) != 0,
233 ("mls_effective_in_range: b not range"));
234
235 return (mls_dominate_element(&range->mm_rangehigh,
236 &effective->mm_effective) &&
237 mls_dominate_element(&effective->mm_effective,
238 &range->mm_rangelow));
239
240 return (1);
241 }
242
243 static int
mls_dominate_effective(struct mac_mls * a,struct mac_mls * b)244 mls_dominate_effective(struct mac_mls *a, struct mac_mls *b)
245 {
246 KASSERT((a->mm_flags & MAC_MLS_FLAG_EFFECTIVE) != 0,
247 ("mls_dominate_effective: a not effective"));
248 KASSERT((b->mm_flags & MAC_MLS_FLAG_EFFECTIVE) != 0,
249 ("mls_dominate_effective: b not effective"));
250
251 return (mls_dominate_element(&a->mm_effective, &b->mm_effective));
252 }
253
254 static int
mls_equal_element(struct mac_mls_element * a,struct mac_mls_element * b)255 mls_equal_element(struct mac_mls_element *a, struct mac_mls_element *b)
256 {
257
258 if (a->mme_type == MAC_MLS_TYPE_EQUAL ||
259 b->mme_type == MAC_MLS_TYPE_EQUAL)
260 return (1);
261
262 return (a->mme_type == b->mme_type && a->mme_level == b->mme_level);
263 }
264
265 static int
mls_equal_effective(struct mac_mls * a,struct mac_mls * b)266 mls_equal_effective(struct mac_mls *a, struct mac_mls *b)
267 {
268
269 KASSERT((a->mm_flags & MAC_MLS_FLAG_EFFECTIVE) != 0,
270 ("mls_equal_effective: a not effective"));
271 KASSERT((b->mm_flags & MAC_MLS_FLAG_EFFECTIVE) != 0,
272 ("mls_equal_effective: b not effective"));
273
274 return (mls_equal_element(&a->mm_effective, &b->mm_effective));
275 }
276
277 static int
mls_contains_equal(struct mac_mls * mm)278 mls_contains_equal(struct mac_mls *mm)
279 {
280
281 if (mm->mm_flags & MAC_MLS_FLAG_EFFECTIVE)
282 if (mm->mm_effective.mme_type == MAC_MLS_TYPE_EQUAL)
283 return (1);
284
285 if (mm->mm_flags & MAC_MLS_FLAG_RANGE) {
286 if (mm->mm_rangelow.mme_type == MAC_MLS_TYPE_EQUAL)
287 return (1);
288 if (mm->mm_rangehigh.mme_type == MAC_MLS_TYPE_EQUAL)
289 return (1);
290 }
291
292 return (0);
293 }
294
295 static int
mls_subject_privileged(struct mac_mls * mm)296 mls_subject_privileged(struct mac_mls *mm)
297 {
298
299 KASSERT((mm->mm_flags & MAC_MLS_FLAGS_BOTH) == MAC_MLS_FLAGS_BOTH,
300 ("mls_subject_privileged: subject doesn't have both labels"));
301
302 /* If the effective is EQUAL, it's ok. */
303 if (mm->mm_effective.mme_type == MAC_MLS_TYPE_EQUAL)
304 return (0);
305
306 /* If either range endpoint is EQUAL, it's ok. */
307 if (mm->mm_rangelow.mme_type == MAC_MLS_TYPE_EQUAL ||
308 mm->mm_rangehigh.mme_type == MAC_MLS_TYPE_EQUAL)
309 return (0);
310
311 /* If the range is low-high, it's ok. */
312 if (mm->mm_rangelow.mme_type == MAC_MLS_TYPE_LOW &&
313 mm->mm_rangehigh.mme_type == MAC_MLS_TYPE_HIGH)
314 return (0);
315
316 /* It's not ok. */
317 return (EPERM);
318 }
319
320 static int
mls_valid(struct mac_mls * mm)321 mls_valid(struct mac_mls *mm)
322 {
323
324 if (mm->mm_flags & MAC_MLS_FLAG_EFFECTIVE) {
325 switch (mm->mm_effective.mme_type) {
326 case MAC_MLS_TYPE_LEVEL:
327 break;
328
329 case MAC_MLS_TYPE_EQUAL:
330 case MAC_MLS_TYPE_HIGH:
331 case MAC_MLS_TYPE_LOW:
332 if (mm->mm_effective.mme_level != 0 ||
333 !MAC_MLS_BIT_SET_EMPTY(
334 mm->mm_effective.mme_compartments))
335 return (EINVAL);
336 break;
337
338 default:
339 return (EINVAL);
340 }
341 } else {
342 if (mm->mm_effective.mme_type != MAC_MLS_TYPE_UNDEF)
343 return (EINVAL);
344 }
345
346 if (mm->mm_flags & MAC_MLS_FLAG_RANGE) {
347 switch (mm->mm_rangelow.mme_type) {
348 case MAC_MLS_TYPE_LEVEL:
349 break;
350
351 case MAC_MLS_TYPE_EQUAL:
352 case MAC_MLS_TYPE_HIGH:
353 case MAC_MLS_TYPE_LOW:
354 if (mm->mm_rangelow.mme_level != 0 ||
355 !MAC_MLS_BIT_SET_EMPTY(
356 mm->mm_rangelow.mme_compartments))
357 return (EINVAL);
358 break;
359
360 default:
361 return (EINVAL);
362 }
363
364 switch (mm->mm_rangehigh.mme_type) {
365 case MAC_MLS_TYPE_LEVEL:
366 break;
367
368 case MAC_MLS_TYPE_EQUAL:
369 case MAC_MLS_TYPE_HIGH:
370 case MAC_MLS_TYPE_LOW:
371 if (mm->mm_rangehigh.mme_level != 0 ||
372 !MAC_MLS_BIT_SET_EMPTY(
373 mm->mm_rangehigh.mme_compartments))
374 return (EINVAL);
375 break;
376
377 default:
378 return (EINVAL);
379 }
380 if (!mls_dominate_element(&mm->mm_rangehigh,
381 &mm->mm_rangelow))
382 return (EINVAL);
383 } else {
384 if (mm->mm_rangelow.mme_type != MAC_MLS_TYPE_UNDEF ||
385 mm->mm_rangehigh.mme_type != MAC_MLS_TYPE_UNDEF)
386 return (EINVAL);
387 }
388
389 return (0);
390 }
391
392 static void
mls_set_range(struct mac_mls * mm,u_short typelow,u_short levellow,u_char * compartmentslow,u_short typehigh,u_short levelhigh,u_char * compartmentshigh)393 mls_set_range(struct mac_mls *mm, u_short typelow, u_short levellow,
394 u_char *compartmentslow, u_short typehigh, u_short levelhigh,
395 u_char *compartmentshigh)
396 {
397
398 mm->mm_rangelow.mme_type = typelow;
399 mm->mm_rangelow.mme_level = levellow;
400 if (compartmentslow != NULL)
401 memcpy(mm->mm_rangelow.mme_compartments, compartmentslow,
402 sizeof(mm->mm_rangelow.mme_compartments));
403 mm->mm_rangehigh.mme_type = typehigh;
404 mm->mm_rangehigh.mme_level = levelhigh;
405 if (compartmentshigh != NULL)
406 memcpy(mm->mm_rangehigh.mme_compartments, compartmentshigh,
407 sizeof(mm->mm_rangehigh.mme_compartments));
408 mm->mm_flags |= MAC_MLS_FLAG_RANGE;
409 }
410
411 static void
mls_set_effective(struct mac_mls * mm,u_short type,u_short level,u_char * compartments)412 mls_set_effective(struct mac_mls *mm, u_short type, u_short level,
413 u_char *compartments)
414 {
415
416 mm->mm_effective.mme_type = type;
417 mm->mm_effective.mme_level = level;
418 if (compartments != NULL)
419 memcpy(mm->mm_effective.mme_compartments, compartments,
420 sizeof(mm->mm_effective.mme_compartments));
421 mm->mm_flags |= MAC_MLS_FLAG_EFFECTIVE;
422 }
423
424 static void
mls_copy_range(struct mac_mls * labelfrom,struct mac_mls * labelto)425 mls_copy_range(struct mac_mls *labelfrom, struct mac_mls *labelto)
426 {
427
428 KASSERT((labelfrom->mm_flags & MAC_MLS_FLAG_RANGE) != 0,
429 ("mls_copy_range: labelfrom not range"));
430
431 labelto->mm_rangelow = labelfrom->mm_rangelow;
432 labelto->mm_rangehigh = labelfrom->mm_rangehigh;
433 labelto->mm_flags |= MAC_MLS_FLAG_RANGE;
434 }
435
436 static void
mls_copy_effective(struct mac_mls * labelfrom,struct mac_mls * labelto)437 mls_copy_effective(struct mac_mls *labelfrom, struct mac_mls *labelto)
438 {
439
440 KASSERT((labelfrom->mm_flags & MAC_MLS_FLAG_EFFECTIVE) != 0,
441 ("mls_copy_effective: labelfrom not effective"));
442
443 labelto->mm_effective = labelfrom->mm_effective;
444 labelto->mm_flags |= MAC_MLS_FLAG_EFFECTIVE;
445 }
446
447 static void
mls_copy(struct mac_mls * source,struct mac_mls * dest)448 mls_copy(struct mac_mls *source, struct mac_mls *dest)
449 {
450
451 if (source->mm_flags & MAC_MLS_FLAG_EFFECTIVE)
452 mls_copy_effective(source, dest);
453 if (source->mm_flags & MAC_MLS_FLAG_RANGE)
454 mls_copy_range(source, dest);
455 }
456
457 /*
458 * Policy module operations.
459 */
460 static void
mls_init(struct mac_policy_conf * conf)461 mls_init(struct mac_policy_conf *conf)
462 {
463
464 zone_mls = uma_zcreate("mac_mls", sizeof(struct mac_mls), NULL,
465 NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
466 }
467
468 /*
469 * Label operations.
470 */
471 static void
mls_init_label(struct label * label)472 mls_init_label(struct label *label)
473 {
474
475 SLOT_SET(label, mls_alloc(M_WAITOK));
476 }
477
478 static int
mls_init_label_waitcheck(struct label * label,int flag)479 mls_init_label_waitcheck(struct label *label, int flag)
480 {
481
482 SLOT_SET(label, mls_alloc(flag));
483 if (SLOT(label) == NULL)
484 return (ENOMEM);
485
486 return (0);
487 }
488
489 static void
mls_destroy_label(struct label * label)490 mls_destroy_label(struct label *label)
491 {
492
493 mls_free(SLOT(label));
494 SLOT_SET(label, NULL);
495 }
496
497 /*
498 * mls_element_to_string() accepts an sbuf and MLS element. It converts the
499 * MLS element to a string and stores the result in the sbuf; if there isn't
500 * space in the sbuf, -1 is returned.
501 */
502 static int
mls_element_to_string(struct sbuf * sb,struct mac_mls_element * element)503 mls_element_to_string(struct sbuf *sb, struct mac_mls_element *element)
504 {
505 int i, first;
506
507 switch (element->mme_type) {
508 case MAC_MLS_TYPE_HIGH:
509 return (sbuf_printf(sb, "high"));
510
511 case MAC_MLS_TYPE_LOW:
512 return (sbuf_printf(sb, "low"));
513
514 case MAC_MLS_TYPE_EQUAL:
515 return (sbuf_printf(sb, "equal"));
516
517 case MAC_MLS_TYPE_LEVEL:
518 if (sbuf_printf(sb, "%d", element->mme_level) == -1)
519 return (-1);
520
521 first = 1;
522 for (i = 1; i <= MAC_MLS_MAX_COMPARTMENTS; i++) {
523 if (MAC_MLS_BIT_TEST(i, element->mme_compartments)) {
524 if (first) {
525 if (sbuf_putc(sb, ':') == -1)
526 return (-1);
527 if (sbuf_printf(sb, "%d", i) == -1)
528 return (-1);
529 first = 0;
530 } else {
531 if (sbuf_printf(sb, "+%d", i) == -1)
532 return (-1);
533 }
534 }
535 }
536 return (0);
537
538 default:
539 panic("mls_element_to_string: invalid type (%d)",
540 element->mme_type);
541 }
542 }
543
544 /*
545 * mls_to_string() converts an MLS label to a string, and places the results
546 * in the passed sbuf. It returns 0 on success, or EINVAL if there isn't
547 * room in the sbuf. Note: the sbuf will be modified even in a failure case,
548 * so the caller may need to revert the sbuf by restoring the offset if
549 * that's undesired.
550 */
551 static int
mls_to_string(struct sbuf * sb,struct mac_mls * mm)552 mls_to_string(struct sbuf *sb, struct mac_mls *mm)
553 {
554
555 if (mm->mm_flags & MAC_MLS_FLAG_EFFECTIVE) {
556 if (mls_element_to_string(sb, &mm->mm_effective) == -1)
557 return (EINVAL);
558 }
559
560 if (mm->mm_flags & MAC_MLS_FLAG_RANGE) {
561 if (sbuf_putc(sb, '(') == -1)
562 return (EINVAL);
563
564 if (mls_element_to_string(sb, &mm->mm_rangelow) == -1)
565 return (EINVAL);
566
567 if (sbuf_putc(sb, '-') == -1)
568 return (EINVAL);
569
570 if (mls_element_to_string(sb, &mm->mm_rangehigh) == -1)
571 return (EINVAL);
572
573 if (sbuf_putc(sb, ')') == -1)
574 return (EINVAL);
575 }
576
577 return (0);
578 }
579
580 static int
mls_externalize_label(struct label * label,char * element_name,struct sbuf * sb,int * claimed)581 mls_externalize_label(struct label *label, char *element_name,
582 struct sbuf *sb, int *claimed)
583 {
584 struct mac_mls *mm;
585
586 if (strcmp(MAC_MLS_LABEL_NAME, element_name) != 0)
587 return (0);
588
589 (*claimed)++;
590
591 mm = SLOT(label);
592
593 return (mls_to_string(sb, mm));
594 }
595
596 static int
mls_parse_element(struct mac_mls_element * element,char * string)597 mls_parse_element(struct mac_mls_element *element, char *string)
598 {
599 char *compartment, *end, *level;
600 int value;
601
602 if (strcmp(string, "high") == 0 || strcmp(string, "hi") == 0) {
603 element->mme_type = MAC_MLS_TYPE_HIGH;
604 element->mme_level = MAC_MLS_TYPE_UNDEF;
605 } else if (strcmp(string, "low") == 0 || strcmp(string, "lo") == 0) {
606 element->mme_type = MAC_MLS_TYPE_LOW;
607 element->mme_level = MAC_MLS_TYPE_UNDEF;
608 } else if (strcmp(string, "equal") == 0 ||
609 strcmp(string, "eq") == 0) {
610 element->mme_type = MAC_MLS_TYPE_EQUAL;
611 element->mme_level = MAC_MLS_TYPE_UNDEF;
612 } else {
613 element->mme_type = MAC_MLS_TYPE_LEVEL;
614
615 /*
616 * Numeric level piece of the element.
617 */
618 level = strsep(&string, ":");
619 value = strtol(level, &end, 10);
620 if (end == level || *end != '\0')
621 return (EINVAL);
622 if (value < 0 || value > 65535)
623 return (EINVAL);
624 element->mme_level = value;
625
626 /*
627 * Optional compartment piece of the element. If none are
628 * included, we assume that the label has no compartments.
629 */
630 if (string == NULL)
631 return (0);
632 if (*string == '\0')
633 return (0);
634
635 while ((compartment = strsep(&string, "+")) != NULL) {
636 value = strtol(compartment, &end, 10);
637 if (compartment == end || *end != '\0')
638 return (EINVAL);
639 if (value < 1 || value > MAC_MLS_MAX_COMPARTMENTS)
640 return (EINVAL);
641 MAC_MLS_BIT_SET(value, element->mme_compartments);
642 }
643 }
644
645 return (0);
646 }
647
648 /*
649 * Note: destructively consumes the string, make a local copy before calling
650 * if that's a problem.
651 */
652 static int
mls_parse(struct mac_mls * mm,char * string)653 mls_parse(struct mac_mls *mm, char *string)
654 {
655 char *rangehigh, *rangelow, *effective;
656 int error;
657
658 effective = strsep(&string, "(");
659 if (*effective == '\0')
660 effective = NULL;
661
662 if (string != NULL) {
663 rangelow = strsep(&string, "-");
664 if (string == NULL)
665 return (EINVAL);
666 rangehigh = strsep(&string, ")");
667 if (string == NULL)
668 return (EINVAL);
669 if (*string != '\0')
670 return (EINVAL);
671 } else {
672 rangelow = NULL;
673 rangehigh = NULL;
674 }
675
676 KASSERT((rangelow != NULL && rangehigh != NULL) ||
677 (rangelow == NULL && rangehigh == NULL),
678 ("mls_parse: range mismatch"));
679
680 bzero(mm, sizeof(*mm));
681 if (effective != NULL) {
682 error = mls_parse_element(&mm->mm_effective, effective);
683 if (error)
684 return (error);
685 mm->mm_flags |= MAC_MLS_FLAG_EFFECTIVE;
686 }
687
688 if (rangelow != NULL) {
689 error = mls_parse_element(&mm->mm_rangelow, rangelow);
690 if (error)
691 return (error);
692 error = mls_parse_element(&mm->mm_rangehigh, rangehigh);
693 if (error)
694 return (error);
695 mm->mm_flags |= MAC_MLS_FLAG_RANGE;
696 }
697
698 error = mls_valid(mm);
699 if (error)
700 return (error);
701
702 return (0);
703 }
704
705 static int
mls_internalize_label(struct label * label,char * element_name,char * element_data,int * claimed)706 mls_internalize_label(struct label *label, char *element_name,
707 char *element_data, int *claimed)
708 {
709 struct mac_mls *mm, mm_temp;
710 int error;
711
712 if (strcmp(MAC_MLS_LABEL_NAME, element_name) != 0)
713 return (0);
714
715 (*claimed)++;
716
717 error = mls_parse(&mm_temp, element_data);
718 if (error)
719 return (error);
720
721 mm = SLOT(label);
722 *mm = mm_temp;
723
724 return (0);
725 }
726
727 static void
mls_copy_label(struct label * src,struct label * dest)728 mls_copy_label(struct label *src, struct label *dest)
729 {
730
731 *SLOT(dest) = *SLOT(src);
732 }
733
734 /*
735 * Object-specific entry point implementations are sorted alphabetically by
736 * object type name and then by operation.
737 */
738 static int
mls_bpfdesc_check_receive(struct bpf_d * d,struct label * dlabel,struct ifnet * ifp,struct label * ifplabel)739 mls_bpfdesc_check_receive(struct bpf_d *d, struct label *dlabel,
740 struct ifnet *ifp, struct label *ifplabel)
741 {
742 struct mac_mls *a, *b;
743
744 if (!mls_enabled)
745 return (0);
746
747 a = SLOT(dlabel);
748 b = SLOT(ifplabel);
749
750 if (mls_equal_effective(a, b))
751 return (0);
752 return (EACCES);
753 }
754
755 static void
mls_bpfdesc_create(struct ucred * cred,struct bpf_d * d,struct label * dlabel)756 mls_bpfdesc_create(struct ucred *cred, struct bpf_d *d, struct label *dlabel)
757 {
758 struct mac_mls *source, *dest;
759
760 source = SLOT(cred->cr_label);
761 dest = SLOT(dlabel);
762
763 mls_copy_effective(source, dest);
764 }
765
766 static void
mls_bpfdesc_create_mbuf(struct bpf_d * d,struct label * dlabel,struct mbuf * m,struct label * mlabel)767 mls_bpfdesc_create_mbuf(struct bpf_d *d, struct label *dlabel,
768 struct mbuf *m, struct label *mlabel)
769 {
770 struct mac_mls *source, *dest;
771
772 source = SLOT(dlabel);
773 dest = SLOT(mlabel);
774
775 mls_copy_effective(source, dest);
776 }
777
778 static void
mls_cred_associate_nfsd(struct ucred * cred)779 mls_cred_associate_nfsd(struct ucred *cred)
780 {
781 struct mac_mls *label;
782
783 label = SLOT(cred->cr_label);
784 mls_set_effective(label, MAC_MLS_TYPE_LOW, 0, NULL);
785 mls_set_range(label, MAC_MLS_TYPE_LOW, 0, NULL, MAC_MLS_TYPE_HIGH, 0,
786 NULL);
787 }
788
789 static int
mls_cred_check_relabel(struct ucred * cred,struct label * newlabel)790 mls_cred_check_relabel(struct ucred *cred, struct label *newlabel)
791 {
792 struct mac_mls *subj, *new;
793 int error;
794
795 subj = SLOT(cred->cr_label);
796 new = SLOT(newlabel);
797
798 /*
799 * If there is an MLS label update for the credential, it may be an
800 * update of effective, range, or both.
801 */
802 error = mls_atmostflags(new, MAC_MLS_FLAGS_BOTH);
803 if (error)
804 return (error);
805
806 /*
807 * If the MLS label is to be changed, authorize as appropriate.
808 */
809 if (new->mm_flags & MAC_MLS_FLAGS_BOTH) {
810 /*
811 * If the change request modifies both the MLS label
812 * effective and range, check that the new effective will be
813 * in the new range.
814 */
815 if ((new->mm_flags & MAC_MLS_FLAGS_BOTH) ==
816 MAC_MLS_FLAGS_BOTH && !mls_effective_in_range(new, new))
817 return (EINVAL);
818
819 /*
820 * To change the MLS effective label on a credential, the new
821 * effective label must be in the current range.
822 */
823 if (new->mm_flags & MAC_MLS_FLAG_EFFECTIVE &&
824 !mls_effective_in_range(new, subj))
825 return (EPERM);
826
827 /*
828 * To change the MLS range label on a credential, the new
829 * range must be in the current range.
830 */
831 if (new->mm_flags & MAC_MLS_FLAG_RANGE &&
832 !mls_range_in_range(new, subj))
833 return (EPERM);
834
835 /*
836 * To have EQUAL in any component of the new credential MLS
837 * label, the subject must already have EQUAL in their label.
838 */
839 if (mls_contains_equal(new)) {
840 error = mls_subject_privileged(subj);
841 if (error)
842 return (error);
843 }
844 }
845
846 return (0);
847 }
848
849 static int
mls_cred_check_visible(struct ucred * cr1,struct ucred * cr2)850 mls_cred_check_visible(struct ucred *cr1, struct ucred *cr2)
851 {
852 struct mac_mls *subj, *obj;
853
854 if (!mls_enabled)
855 return (0);
856
857 subj = SLOT(cr1->cr_label);
858 obj = SLOT(cr2->cr_label);
859
860 /* XXX: range */
861 if (!mls_dominate_effective(subj, obj))
862 return (ESRCH);
863
864 return (0);
865 }
866
867 static void
mls_cred_create_init(struct ucred * cred)868 mls_cred_create_init(struct ucred *cred)
869 {
870 struct mac_mls *dest;
871
872 dest = SLOT(cred->cr_label);
873
874 mls_set_effective(dest, MAC_MLS_TYPE_LOW, 0, NULL);
875 mls_set_range(dest, MAC_MLS_TYPE_LOW, 0, NULL, MAC_MLS_TYPE_HIGH, 0,
876 NULL);
877 }
878
879 static void
mls_cred_create_swapper(struct ucred * cred)880 mls_cred_create_swapper(struct ucred *cred)
881 {
882 struct mac_mls *dest;
883
884 dest = SLOT(cred->cr_label);
885
886 mls_set_effective(dest, MAC_MLS_TYPE_EQUAL, 0, NULL);
887 mls_set_range(dest, MAC_MLS_TYPE_LOW, 0, NULL, MAC_MLS_TYPE_HIGH, 0,
888 NULL);
889 }
890
891 static void
mls_cred_relabel(struct ucred * cred,struct label * newlabel)892 mls_cred_relabel(struct ucred *cred, struct label *newlabel)
893 {
894 struct mac_mls *source, *dest;
895
896 source = SLOT(newlabel);
897 dest = SLOT(cred->cr_label);
898
899 mls_copy(source, dest);
900 }
901
902 static void
mls_devfs_create_device(struct ucred * cred,struct mount * mp,struct cdev * dev,struct devfs_dirent * de,struct label * delabel)903 mls_devfs_create_device(struct ucred *cred, struct mount *mp,
904 struct cdev *dev, struct devfs_dirent *de, struct label *delabel)
905 {
906 struct mac_mls *mm;
907 const char *dn;
908 int mls_type;
909
910 mm = SLOT(delabel);
911 dn = devtoname(dev);
912 if (strcmp(dn, "null") == 0 ||
913 strcmp(dn, "zero") == 0 ||
914 strcmp(dn, "random") == 0 ||
915 strncmp(dn, "fd/", strlen("fd/")) == 0)
916 mls_type = MAC_MLS_TYPE_EQUAL;
917 else if (strcmp(dn, "kmem") == 0 ||
918 strcmp(dn, "mem") == 0)
919 mls_type = MAC_MLS_TYPE_HIGH;
920 else if (ptys_equal &&
921 (strncmp(dn, "ttyp", strlen("ttyp")) == 0 ||
922 strncmp(dn, "pts/", strlen("pts/")) == 0 ||
923 strncmp(dn, "ptyp", strlen("ptyp")) == 0))
924 mls_type = MAC_MLS_TYPE_EQUAL;
925 else
926 mls_type = MAC_MLS_TYPE_LOW;
927 mls_set_effective(mm, mls_type, 0, NULL);
928 }
929
930 static void
mls_devfs_create_directory(struct mount * mp,char * dirname,int dirnamelen,struct devfs_dirent * de,struct label * delabel)931 mls_devfs_create_directory(struct mount *mp, char *dirname, int dirnamelen,
932 struct devfs_dirent *de, struct label *delabel)
933 {
934 struct mac_mls *mm;
935
936 mm = SLOT(delabel);
937 mls_set_effective(mm, MAC_MLS_TYPE_LOW, 0, NULL);
938 }
939
940 static void
mls_devfs_create_symlink(struct ucred * cred,struct mount * mp,struct devfs_dirent * dd,struct label * ddlabel,struct devfs_dirent * de,struct label * delabel)941 mls_devfs_create_symlink(struct ucred *cred, struct mount *mp,
942 struct devfs_dirent *dd, struct label *ddlabel, struct devfs_dirent *de,
943 struct label *delabel)
944 {
945 struct mac_mls *source, *dest;
946
947 source = SLOT(cred->cr_label);
948 dest = SLOT(delabel);
949
950 mls_copy_effective(source, dest);
951 }
952
953 static void
mls_devfs_update(struct mount * mp,struct devfs_dirent * de,struct label * delabel,struct vnode * vp,struct label * vplabel)954 mls_devfs_update(struct mount *mp, struct devfs_dirent *de,
955 struct label *delabel, struct vnode *vp, struct label *vplabel)
956 {
957 struct mac_mls *source, *dest;
958
959 source = SLOT(vplabel);
960 dest = SLOT(delabel);
961
962 mls_copy_effective(source, dest);
963 }
964
965 static void
mls_devfs_vnode_associate(struct mount * mp,struct label * mplabel,struct devfs_dirent * de,struct label * delabel,struct vnode * vp,struct label * vplabel)966 mls_devfs_vnode_associate(struct mount *mp, struct label *mplabel,
967 struct devfs_dirent *de, struct label *delabel, struct vnode *vp,
968 struct label *vplabel)
969 {
970 struct mac_mls *source, *dest;
971
972 source = SLOT(delabel);
973 dest = SLOT(vplabel);
974
975 mls_copy_effective(source, dest);
976 }
977
978 static int
mls_ifnet_check_relabel(struct ucred * cred,struct ifnet * ifp,struct label * ifplabel,struct label * newlabel)979 mls_ifnet_check_relabel(struct ucred *cred, struct ifnet *ifp,
980 struct label *ifplabel, struct label *newlabel)
981 {
982 struct mac_mls *subj, *new;
983 int error;
984
985 subj = SLOT(cred->cr_label);
986 new = SLOT(newlabel);
987
988 /*
989 * If there is an MLS label update for the interface, it may be an
990 * update of effective, range, or both.
991 */
992 error = mls_atmostflags(new, MAC_MLS_FLAGS_BOTH);
993 if (error)
994 return (error);
995
996 /*
997 * Relabeling network interfaces requires MLS privilege.
998 */
999 return (mls_subject_privileged(subj));
1000 }
1001
1002 static int
mls_ifnet_check_transmit(struct ifnet * ifp,struct label * ifplabel,struct mbuf * m,struct label * mlabel)1003 mls_ifnet_check_transmit(struct ifnet *ifp, struct label *ifplabel,
1004 struct mbuf *m, struct label *mlabel)
1005 {
1006 struct mac_mls *p, *i;
1007
1008 if (!mls_enabled)
1009 return (0);
1010
1011 p = SLOT(mlabel);
1012 i = SLOT(ifplabel);
1013
1014 return (mls_effective_in_range(p, i) ? 0 : EACCES);
1015 }
1016
1017 static void
mls_ifnet_create(struct ifnet * ifp,struct label * ifplabel)1018 mls_ifnet_create(struct ifnet *ifp, struct label *ifplabel)
1019 {
1020 struct mac_mls *dest;
1021 int type;
1022
1023 dest = SLOT(ifplabel);
1024
1025 if (if_gettype(ifp) == IFT_LOOP)
1026 type = MAC_MLS_TYPE_EQUAL;
1027 else
1028 type = MAC_MLS_TYPE_LOW;
1029
1030 mls_set_effective(dest, type, 0, NULL);
1031 mls_set_range(dest, type, 0, NULL, type, 0, NULL);
1032 }
1033
1034 static void
mls_ifnet_create_mbuf(struct ifnet * ifp,struct label * ifplabel,struct mbuf * m,struct label * mlabel)1035 mls_ifnet_create_mbuf(struct ifnet *ifp, struct label *ifplabel,
1036 struct mbuf *m, struct label *mlabel)
1037 {
1038 struct mac_mls *source, *dest;
1039
1040 source = SLOT(ifplabel);
1041 dest = SLOT(mlabel);
1042
1043 mls_copy_effective(source, dest);
1044 }
1045
1046 static void
mls_ifnet_relabel(struct ucred * cred,struct ifnet * ifp,struct label * ifplabel,struct label * newlabel)1047 mls_ifnet_relabel(struct ucred *cred, struct ifnet *ifp,
1048 struct label *ifplabel, struct label *newlabel)
1049 {
1050 struct mac_mls *source, *dest;
1051
1052 source = SLOT(newlabel);
1053 dest = SLOT(ifplabel);
1054
1055 mls_copy(source, dest);
1056 }
1057
1058 static int
mls_inpcb_check_deliver(struct inpcb * inp,struct label * inplabel,struct mbuf * m,struct label * mlabel)1059 mls_inpcb_check_deliver(struct inpcb *inp, struct label *inplabel,
1060 struct mbuf *m, struct label *mlabel)
1061 {
1062 struct mac_mls *p, *i;
1063
1064 if (!mls_enabled)
1065 return (0);
1066
1067 p = SLOT(mlabel);
1068 i = SLOT(inplabel);
1069
1070 return (mls_equal_effective(p, i) ? 0 : EACCES);
1071 }
1072
1073 static int
mls_inpcb_check_visible(struct ucred * cred,struct inpcb * inp,struct label * inplabel)1074 mls_inpcb_check_visible(struct ucred *cred, struct inpcb *inp,
1075 struct label *inplabel)
1076 {
1077 struct mac_mls *subj, *obj;
1078
1079 if (!mls_enabled)
1080 return (0);
1081
1082 subj = SLOT(cred->cr_label);
1083 obj = SLOT(inplabel);
1084
1085 if (!mls_dominate_effective(subj, obj))
1086 return (ENOENT);
1087
1088 return (0);
1089 }
1090
1091 static void
mls_inpcb_create(struct socket * so,struct label * solabel,struct inpcb * inp,struct label * inplabel)1092 mls_inpcb_create(struct socket *so, struct label *solabel, struct inpcb *inp,
1093 struct label *inplabel)
1094 {
1095 struct mac_mls *source, *dest;
1096
1097 source = SLOT(solabel);
1098 dest = SLOT(inplabel);
1099
1100 mls_copy_effective(source, dest);
1101 }
1102
1103 static void
mls_inpcb_create_mbuf(struct inpcb * inp,struct label * inplabel,struct mbuf * m,struct label * mlabel)1104 mls_inpcb_create_mbuf(struct inpcb *inp, struct label *inplabel,
1105 struct mbuf *m, struct label *mlabel)
1106 {
1107 struct mac_mls *source, *dest;
1108
1109 source = SLOT(inplabel);
1110 dest = SLOT(mlabel);
1111
1112 mls_copy_effective(source, dest);
1113 }
1114
1115 static void
mls_inpcb_sosetlabel(struct socket * so,struct label * solabel,struct inpcb * inp,struct label * inplabel)1116 mls_inpcb_sosetlabel(struct socket *so, struct label *solabel,
1117 struct inpcb *inp, struct label *inplabel)
1118 {
1119 struct mac_mls *source, *dest;
1120
1121 SOCK_LOCK_ASSERT(so);
1122
1123 source = SLOT(solabel);
1124 dest = SLOT(inplabel);
1125
1126 mls_copy(source, dest);
1127 }
1128
1129 static void
mls_ip6q_create(struct mbuf * m,struct label * mlabel,struct ip6q * q6,struct label * q6label)1130 mls_ip6q_create(struct mbuf *m, struct label *mlabel, struct ip6q *q6,
1131 struct label *q6label)
1132 {
1133 struct mac_mls *source, *dest;
1134
1135 source = SLOT(mlabel);
1136 dest = SLOT(q6label);
1137
1138 mls_copy_effective(source, dest);
1139 }
1140
1141 static int
mls_ip6q_match(struct mbuf * m,struct label * mlabel,struct ip6q * q6,struct label * q6label)1142 mls_ip6q_match(struct mbuf *m, struct label *mlabel, struct ip6q *q6,
1143 struct label *q6label)
1144 {
1145 struct mac_mls *a, *b;
1146
1147 a = SLOT(q6label);
1148 b = SLOT(mlabel);
1149
1150 return (mls_equal_effective(a, b));
1151 }
1152
1153 static void
mls_ip6q_reassemble(struct ip6q * q6,struct label * q6label,struct mbuf * m,struct label * mlabel)1154 mls_ip6q_reassemble(struct ip6q *q6, struct label *q6label, struct mbuf *m,
1155 struct label *mlabel)
1156 {
1157 struct mac_mls *source, *dest;
1158
1159 source = SLOT(q6label);
1160 dest = SLOT(mlabel);
1161
1162 /* Just use the head, since we require them all to match. */
1163 mls_copy_effective(source, dest);
1164 }
1165
1166 static void
mls_ip6q_update(struct mbuf * m,struct label * mlabel,struct ip6q * q6,struct label * q6label)1167 mls_ip6q_update(struct mbuf *m, struct label *mlabel, struct ip6q *q6,
1168 struct label *q6label)
1169 {
1170
1171 /* NOOP: we only accept matching labels, so no need to update */
1172 }
1173
1174 static void
mls_ipq_create(struct mbuf * m,struct label * mlabel,struct ipq * q,struct label * qlabel)1175 mls_ipq_create(struct mbuf *m, struct label *mlabel, struct ipq *q,
1176 struct label *qlabel)
1177 {
1178 struct mac_mls *source, *dest;
1179
1180 source = SLOT(mlabel);
1181 dest = SLOT(qlabel);
1182
1183 mls_copy_effective(source, dest);
1184 }
1185
1186 static int
mls_ipq_match(struct mbuf * m,struct label * mlabel,struct ipq * q,struct label * qlabel)1187 mls_ipq_match(struct mbuf *m, struct label *mlabel, struct ipq *q,
1188 struct label *qlabel)
1189 {
1190 struct mac_mls *a, *b;
1191
1192 a = SLOT(qlabel);
1193 b = SLOT(mlabel);
1194
1195 return (mls_equal_effective(a, b));
1196 }
1197
1198 static void
mls_ipq_reassemble(struct ipq * q,struct label * qlabel,struct mbuf * m,struct label * mlabel)1199 mls_ipq_reassemble(struct ipq *q, struct label *qlabel, struct mbuf *m,
1200 struct label *mlabel)
1201 {
1202 struct mac_mls *source, *dest;
1203
1204 source = SLOT(qlabel);
1205 dest = SLOT(mlabel);
1206
1207 /* Just use the head, since we require them all to match. */
1208 mls_copy_effective(source, dest);
1209 }
1210
1211 static void
mls_ipq_update(struct mbuf * m,struct label * mlabel,struct ipq * q,struct label * qlabel)1212 mls_ipq_update(struct mbuf *m, struct label *mlabel, struct ipq *q,
1213 struct label *qlabel)
1214 {
1215
1216 /* NOOP: we only accept matching labels, so no need to update */
1217 }
1218
1219 static int
mls_mount_check_stat(struct ucred * cred,struct mount * mp,struct label * mntlabel)1220 mls_mount_check_stat(struct ucred *cred, struct mount *mp,
1221 struct label *mntlabel)
1222 {
1223 struct mac_mls *subj, *obj;
1224
1225 if (!mls_enabled)
1226 return (0);
1227
1228 subj = SLOT(cred->cr_label);
1229 obj = SLOT(mntlabel);
1230
1231 if (!mls_dominate_effective(subj, obj))
1232 return (EACCES);
1233
1234 return (0);
1235 }
1236
1237 static void
mls_mount_create(struct ucred * cred,struct mount * mp,struct label * mplabel)1238 mls_mount_create(struct ucred *cred, struct mount *mp, struct label *mplabel)
1239 {
1240 struct mac_mls *source, *dest;
1241
1242 source = SLOT(cred->cr_label);
1243 dest = SLOT(mplabel);
1244
1245 mls_copy_effective(source, dest);
1246 }
1247
1248 static void
mls_netinet_arp_send(struct ifnet * ifp,struct label * ifplabel,struct mbuf * m,struct label * mlabel)1249 mls_netinet_arp_send(struct ifnet *ifp, struct label *ifplabel,
1250 struct mbuf *m, struct label *mlabel)
1251 {
1252 struct mac_mls *dest;
1253
1254 dest = SLOT(mlabel);
1255
1256 mls_set_effective(dest, MAC_MLS_TYPE_EQUAL, 0, NULL);
1257 }
1258
1259 static void
mls_netinet_firewall_reply(struct mbuf * mrecv,struct label * mrecvlabel,struct mbuf * msend,struct label * msendlabel)1260 mls_netinet_firewall_reply(struct mbuf *mrecv, struct label *mrecvlabel,
1261 struct mbuf *msend, struct label *msendlabel)
1262 {
1263 struct mac_mls *source, *dest;
1264
1265 source = SLOT(mrecvlabel);
1266 dest = SLOT(msendlabel);
1267
1268 mls_copy_effective(source, dest);
1269 }
1270
1271 static void
mls_netinet_firewall_send(struct mbuf * m,struct label * mlabel)1272 mls_netinet_firewall_send(struct mbuf *m, struct label *mlabel)
1273 {
1274 struct mac_mls *dest;
1275
1276 dest = SLOT(mlabel);
1277
1278 /* XXX: where is the label for the firewall really coming from? */
1279 mls_set_effective(dest, MAC_MLS_TYPE_EQUAL, 0, NULL);
1280 }
1281
1282 static void
mls_netinet_fragment(struct mbuf * m,struct label * mlabel,struct mbuf * frag,struct label * fraglabel)1283 mls_netinet_fragment(struct mbuf *m, struct label *mlabel, struct mbuf *frag,
1284 struct label *fraglabel)
1285 {
1286 struct mac_mls *source, *dest;
1287
1288 source = SLOT(mlabel);
1289 dest = SLOT(fraglabel);
1290
1291 mls_copy_effective(source, dest);
1292 }
1293
1294 static void
mls_netinet_icmp_reply(struct mbuf * mrecv,struct label * mrecvlabel,struct mbuf * msend,struct label * msendlabel)1295 mls_netinet_icmp_reply(struct mbuf *mrecv, struct label *mrecvlabel,
1296 struct mbuf *msend, struct label *msendlabel)
1297 {
1298 struct mac_mls *source, *dest;
1299
1300 source = SLOT(mrecvlabel);
1301 dest = SLOT(msendlabel);
1302
1303 mls_copy_effective(source, dest);
1304 }
1305
1306 static void
mls_netinet_igmp_send(struct ifnet * ifp,struct label * ifplabel,struct mbuf * m,struct label * mlabel)1307 mls_netinet_igmp_send(struct ifnet *ifp, struct label *ifplabel,
1308 struct mbuf *m, struct label *mlabel)
1309 {
1310 struct mac_mls *dest;
1311
1312 dest = SLOT(mlabel);
1313
1314 mls_set_effective(dest, MAC_MLS_TYPE_EQUAL, 0, NULL);
1315 }
1316
1317 static void
mls_netinet6_nd6_send(struct ifnet * ifp,struct label * ifplabel,struct mbuf * m,struct label * mlabel)1318 mls_netinet6_nd6_send(struct ifnet *ifp, struct label *ifplabel,
1319 struct mbuf *m, struct label *mlabel)
1320 {
1321 struct mac_mls *dest;
1322
1323 dest = SLOT(mlabel);
1324
1325 mls_set_effective(dest, MAC_MLS_TYPE_EQUAL, 0, NULL);
1326 }
1327
1328 static int
mls_pipe_check_ioctl(struct ucred * cred,struct pipepair * pp,struct label * pplabel,unsigned long cmd,void * data)1329 mls_pipe_check_ioctl(struct ucred *cred, struct pipepair *pp,
1330 struct label *pplabel, unsigned long cmd, void /* caddr_t */ *data)
1331 {
1332
1333 if (!mls_enabled)
1334 return (0);
1335
1336 /* XXX: This will be implemented soon... */
1337
1338 return (0);
1339 }
1340
1341 static int
mls_pipe_check_poll(struct ucred * cred,struct pipepair * pp,struct label * pplabel)1342 mls_pipe_check_poll(struct ucred *cred, struct pipepair *pp,
1343 struct label *pplabel)
1344 {
1345 struct mac_mls *subj, *obj;
1346
1347 if (!mls_enabled)
1348 return (0);
1349
1350 subj = SLOT(cred->cr_label);
1351 obj = SLOT(pplabel);
1352
1353 if (!mls_dominate_effective(subj, obj))
1354 return (EACCES);
1355
1356 return (0);
1357 }
1358
1359 static int
mls_pipe_check_read(struct ucred * cred,struct pipepair * pp,struct label * pplabel)1360 mls_pipe_check_read(struct ucred *cred, struct pipepair *pp,
1361 struct label *pplabel)
1362 {
1363 struct mac_mls *subj, *obj;
1364
1365 if (!mls_enabled)
1366 return (0);
1367
1368 subj = SLOT(cred->cr_label);
1369 obj = SLOT(pplabel);
1370
1371 if (!mls_dominate_effective(subj, obj))
1372 return (EACCES);
1373
1374 return (0);
1375 }
1376
1377 static int
mls_pipe_check_relabel(struct ucred * cred,struct pipepair * pp,struct label * pplabel,struct label * newlabel)1378 mls_pipe_check_relabel(struct ucred *cred, struct pipepair *pp,
1379 struct label *pplabel, struct label *newlabel)
1380 {
1381 struct mac_mls *subj, *obj, *new;
1382 int error;
1383
1384 new = SLOT(newlabel);
1385 subj = SLOT(cred->cr_label);
1386 obj = SLOT(pplabel);
1387
1388 /*
1389 * If there is an MLS label update for a pipe, it must be a effective
1390 * update.
1391 */
1392 error = mls_atmostflags(new, MAC_MLS_FLAG_EFFECTIVE);
1393 if (error)
1394 return (error);
1395
1396 /*
1397 * To perform a relabel of a pipe (MLS label or not), MLS must
1398 * authorize the relabel.
1399 */
1400 if (!mls_effective_in_range(obj, subj))
1401 return (EPERM);
1402
1403 /*
1404 * If the MLS label is to be changed, authorize as appropriate.
1405 */
1406 if (new->mm_flags & MAC_MLS_FLAG_EFFECTIVE) {
1407 /*
1408 * To change the MLS label on a pipe, the new pipe label must
1409 * be in the subject range.
1410 */
1411 if (!mls_effective_in_range(new, subj))
1412 return (EPERM);
1413
1414 /*
1415 * To change the MLS label on a pipe to be EQUAL, the subject
1416 * must have appropriate privilege.
1417 */
1418 if (mls_contains_equal(new)) {
1419 error = mls_subject_privileged(subj);
1420 if (error)
1421 return (error);
1422 }
1423 }
1424
1425 return (0);
1426 }
1427
1428 static int
mls_pipe_check_stat(struct ucred * cred,struct pipepair * pp,struct label * pplabel)1429 mls_pipe_check_stat(struct ucred *cred, struct pipepair *pp,
1430 struct label *pplabel)
1431 {
1432 struct mac_mls *subj, *obj;
1433
1434 if (!mls_enabled)
1435 return (0);
1436
1437 subj = SLOT(cred->cr_label);
1438 obj = SLOT(pplabel);
1439
1440 if (!mls_dominate_effective(subj, obj))
1441 return (EACCES);
1442
1443 return (0);
1444 }
1445
1446 static int
mls_pipe_check_write(struct ucred * cred,struct pipepair * pp,struct label * pplabel)1447 mls_pipe_check_write(struct ucred *cred, struct pipepair *pp,
1448 struct label *pplabel)
1449 {
1450 struct mac_mls *subj, *obj;
1451
1452 if (!mls_enabled)
1453 return (0);
1454
1455 subj = SLOT(cred->cr_label);
1456 obj = SLOT(pplabel);
1457
1458 if (!mls_dominate_effective(obj, subj))
1459 return (EACCES);
1460
1461 return (0);
1462 }
1463
1464 static void
mls_pipe_create(struct ucred * cred,struct pipepair * pp,struct label * pplabel)1465 mls_pipe_create(struct ucred *cred, struct pipepair *pp,
1466 struct label *pplabel)
1467 {
1468 struct mac_mls *source, *dest;
1469
1470 source = SLOT(cred->cr_label);
1471 dest = SLOT(pplabel);
1472
1473 mls_copy_effective(source, dest);
1474 }
1475
1476 static void
mls_pipe_relabel(struct ucred * cred,struct pipepair * pp,struct label * pplabel,struct label * newlabel)1477 mls_pipe_relabel(struct ucred *cred, struct pipepair *pp,
1478 struct label *pplabel, struct label *newlabel)
1479 {
1480 struct mac_mls *source, *dest;
1481
1482 source = SLOT(newlabel);
1483 dest = SLOT(pplabel);
1484
1485 mls_copy(source, dest);
1486 }
1487
1488 static int
mls_posixsem_check_openunlink(struct ucred * cred,struct ksem * ks,struct label * kslabel)1489 mls_posixsem_check_openunlink(struct ucred *cred, struct ksem *ks,
1490 struct label *kslabel)
1491 {
1492 struct mac_mls *subj, *obj;
1493
1494 if (!mls_enabled)
1495 return (0);
1496
1497 subj = SLOT(cred->cr_label);
1498 obj = SLOT(kslabel);
1499
1500 if (!mls_dominate_effective(obj, subj))
1501 return (EACCES);
1502
1503 return (0);
1504 }
1505
1506 static int
mls_posixsem_check_rdonly(struct ucred * active_cred,struct ucred * file_cred,struct ksem * ks,struct label * kslabel)1507 mls_posixsem_check_rdonly(struct ucred *active_cred, struct ucred *file_cred,
1508 struct ksem *ks, struct label *kslabel)
1509 {
1510 struct mac_mls *subj, *obj;
1511
1512 if (!mls_enabled)
1513 return (0);
1514
1515 subj = SLOT(active_cred->cr_label);
1516 obj = SLOT(kslabel);
1517
1518 if (!mls_dominate_effective(subj, obj))
1519 return (EACCES);
1520
1521 return (0);
1522 }
1523
1524 static int
mls_posixsem_check_setmode(struct ucred * cred,struct ksem * ks,struct label * shmlabel,mode_t mode)1525 mls_posixsem_check_setmode(struct ucred *cred, struct ksem *ks,
1526 struct label *shmlabel, mode_t mode)
1527 {
1528 struct mac_mls *subj, *obj;
1529
1530 if (!mls_enabled)
1531 return (0);
1532
1533 subj = SLOT(cred->cr_label);
1534 obj = SLOT(shmlabel);
1535
1536 if (!mls_dominate_effective(obj, subj))
1537 return (EACCES);
1538
1539 return (0);
1540 }
1541
1542 static int
mls_posixsem_check_setowner(struct ucred * cred,struct ksem * ks,struct label * shmlabel,uid_t uid,gid_t gid)1543 mls_posixsem_check_setowner(struct ucred *cred, struct ksem *ks,
1544 struct label *shmlabel, uid_t uid, gid_t gid)
1545 {
1546 struct mac_mls *subj, *obj;
1547
1548 if (!mls_enabled)
1549 return (0);
1550
1551 subj = SLOT(cred->cr_label);
1552 obj = SLOT(shmlabel);
1553
1554 if (!mls_dominate_effective(obj, subj))
1555 return (EACCES);
1556
1557 return (0);
1558 }
1559
1560 static int
mls_posixsem_check_write(struct ucred * active_cred,struct ucred * file_cred,struct ksem * ks,struct label * kslabel)1561 mls_posixsem_check_write(struct ucred *active_cred, struct ucred *file_cred,
1562 struct ksem *ks, struct label *kslabel)
1563 {
1564 struct mac_mls *subj, *obj;
1565
1566 if (!mls_enabled)
1567 return (0);
1568
1569 subj = SLOT(active_cred->cr_label);
1570 obj = SLOT(kslabel);
1571
1572 if (!mls_dominate_effective(obj, subj))
1573 return (EACCES);
1574
1575 return (0);
1576 }
1577
1578 static void
mls_posixsem_create(struct ucred * cred,struct ksem * ks,struct label * kslabel)1579 mls_posixsem_create(struct ucred *cred, struct ksem *ks,
1580 struct label *kslabel)
1581 {
1582 struct mac_mls *source, *dest;
1583
1584 source = SLOT(cred->cr_label);
1585 dest = SLOT(kslabel);
1586
1587 mls_copy_effective(source, dest);
1588 }
1589
1590 static int
mls_posixshm_check_mmap(struct ucred * cred,struct shmfd * shmfd,struct label * shmlabel,int prot,int flags)1591 mls_posixshm_check_mmap(struct ucred *cred, struct shmfd *shmfd,
1592 struct label *shmlabel, int prot, int flags)
1593 {
1594 struct mac_mls *subj, *obj;
1595
1596 if (!mls_enabled)
1597 return (0);
1598
1599 subj = SLOT(cred->cr_label);
1600 obj = SLOT(shmlabel);
1601
1602 if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) {
1603 if (!mls_dominate_effective(subj, obj))
1604 return (EACCES);
1605 }
1606 if (((prot & VM_PROT_WRITE) != 0) && ((flags & MAP_SHARED) != 0)) {
1607 if (!mls_dominate_effective(obj, subj))
1608 return (EACCES);
1609 }
1610
1611 return (0);
1612 }
1613
1614 static int
mls_posixshm_check_open(struct ucred * cred,struct shmfd * shmfd,struct label * shmlabel,accmode_t accmode)1615 mls_posixshm_check_open(struct ucred *cred, struct shmfd *shmfd,
1616 struct label *shmlabel, accmode_t accmode)
1617 {
1618 struct mac_mls *subj, *obj;
1619
1620 if (!mls_enabled)
1621 return (0);
1622
1623 subj = SLOT(cred->cr_label);
1624 obj = SLOT(shmlabel);
1625
1626 if (accmode & (VREAD | VEXEC | VSTAT_PERMS)) {
1627 if (!mls_dominate_effective(subj, obj))
1628 return (EACCES);
1629 }
1630 if (accmode & VMODIFY_PERMS) {
1631 if (!mls_dominate_effective(obj, subj))
1632 return (EACCES);
1633 }
1634
1635 return (0);
1636 }
1637
1638 static int
mls_posixshm_check_read(struct ucred * active_cred,struct ucred * file_cred,struct shmfd * shm,struct label * shmlabel)1639 mls_posixshm_check_read(struct ucred *active_cred, struct ucred *file_cred,
1640 struct shmfd *shm, struct label *shmlabel)
1641 {
1642 struct mac_mls *subj, *obj;
1643
1644 if (!mls_enabled || !revocation_enabled)
1645 return (0);
1646
1647 subj = SLOT(active_cred->cr_label);
1648 obj = SLOT(shmlabel);
1649
1650 if (!mls_dominate_effective(subj, obj))
1651 return (EACCES);
1652
1653 return (0);
1654 }
1655
1656 static int
mls_posixshm_check_setmode(struct ucred * cred,struct shmfd * shmfd,struct label * shmlabel,mode_t mode)1657 mls_posixshm_check_setmode(struct ucred *cred, struct shmfd *shmfd,
1658 struct label *shmlabel, mode_t mode)
1659 {
1660 struct mac_mls *subj, *obj;
1661
1662 if (!mls_enabled)
1663 return (0);
1664
1665 subj = SLOT(cred->cr_label);
1666 obj = SLOT(shmlabel);
1667
1668 if (!mls_dominate_effective(obj, subj))
1669 return (EACCES);
1670
1671 return (0);
1672 }
1673
1674 static int
mls_posixshm_check_setowner(struct ucred * cred,struct shmfd * shmfd,struct label * shmlabel,uid_t uid,gid_t gid)1675 mls_posixshm_check_setowner(struct ucred *cred, struct shmfd *shmfd,
1676 struct label *shmlabel, uid_t uid, gid_t gid)
1677 {
1678 struct mac_mls *subj, *obj;
1679
1680 if (!mls_enabled)
1681 return (0);
1682
1683 subj = SLOT(cred->cr_label);
1684 obj = SLOT(shmlabel);
1685
1686 if (!mls_dominate_effective(obj, subj))
1687 return (EACCES);
1688
1689 return (0);
1690 }
1691
1692 static int
mls_posixshm_check_stat(struct ucred * active_cred,struct ucred * file_cred,struct shmfd * shmfd,struct label * shmlabel)1693 mls_posixshm_check_stat(struct ucred *active_cred, struct ucred *file_cred,
1694 struct shmfd *shmfd, struct label *shmlabel)
1695 {
1696 struct mac_mls *subj, *obj;
1697
1698 if (!mls_enabled)
1699 return (0);
1700
1701 subj = SLOT(active_cred->cr_label);
1702 obj = SLOT(shmlabel);
1703
1704 if (!mls_dominate_effective(subj, obj))
1705 return (EACCES);
1706
1707 return (0);
1708 }
1709
1710 static int
mls_posixshm_check_truncate(struct ucred * active_cred,struct ucred * file_cred,struct shmfd * shmfd,struct label * shmlabel)1711 mls_posixshm_check_truncate(struct ucred *active_cred,
1712 struct ucred *file_cred, struct shmfd *shmfd, struct label *shmlabel)
1713 {
1714 struct mac_mls *subj, *obj;
1715
1716 if (!mls_enabled)
1717 return (0);
1718
1719 subj = SLOT(active_cred->cr_label);
1720 obj = SLOT(shmlabel);
1721
1722 if (!mls_dominate_effective(obj, subj))
1723 return (EACCES);
1724
1725 return (0);
1726 }
1727
1728 static int
mls_posixshm_check_unlink(struct ucred * cred,struct shmfd * shmfd,struct label * shmlabel)1729 mls_posixshm_check_unlink(struct ucred *cred, struct shmfd *shmfd,
1730 struct label *shmlabel)
1731 {
1732 struct mac_mls *subj, *obj;
1733
1734 if (!mls_enabled)
1735 return (0);
1736
1737 subj = SLOT(cred->cr_label);
1738 obj = SLOT(shmlabel);
1739
1740 if (!mls_dominate_effective(obj, subj))
1741 return (EACCES);
1742
1743 return (0);
1744 }
1745
1746 static int
mls_posixshm_check_write(struct ucred * active_cred,struct ucred * file_cred,struct shmfd * shm,struct label * shmlabel)1747 mls_posixshm_check_write(struct ucred *active_cred, struct ucred *file_cred,
1748 struct shmfd *shm, struct label *shmlabel)
1749 {
1750 struct mac_mls *subj, *obj;
1751
1752 if (!mls_enabled || !revocation_enabled)
1753 return (0);
1754
1755 subj = SLOT(active_cred->cr_label);
1756 obj = SLOT(shmlabel);
1757
1758 if (!mls_dominate_effective(subj, obj))
1759 return (EACCES);
1760
1761 return (0);
1762 }
1763
1764 static void
mls_posixshm_create(struct ucred * cred,struct shmfd * shmfd,struct label * shmlabel)1765 mls_posixshm_create(struct ucred *cred, struct shmfd *shmfd,
1766 struct label *shmlabel)
1767 {
1768 struct mac_mls *source, *dest;
1769
1770 source = SLOT(cred->cr_label);
1771 dest = SLOT(shmlabel);
1772
1773 mls_copy_effective(source, dest);
1774 }
1775
1776 static int
mls_proc_check_debug(struct ucred * cred,struct proc * p)1777 mls_proc_check_debug(struct ucred *cred, struct proc *p)
1778 {
1779 struct mac_mls *subj, *obj;
1780
1781 if (!mls_enabled)
1782 return (0);
1783
1784 subj = SLOT(cred->cr_label);
1785 obj = SLOT(p->p_ucred->cr_label);
1786
1787 /* XXX: range checks */
1788 if (!mls_dominate_effective(subj, obj))
1789 return (ESRCH);
1790 if (!mls_dominate_effective(obj, subj))
1791 return (EACCES);
1792
1793 return (0);
1794 }
1795
1796 static int
mls_proc_check_sched(struct ucred * cred,struct proc * p)1797 mls_proc_check_sched(struct ucred *cred, struct proc *p)
1798 {
1799 struct mac_mls *subj, *obj;
1800
1801 if (!mls_enabled)
1802 return (0);
1803
1804 subj = SLOT(cred->cr_label);
1805 obj = SLOT(p->p_ucred->cr_label);
1806
1807 /* XXX: range checks */
1808 if (!mls_dominate_effective(subj, obj))
1809 return (ESRCH);
1810 if (!mls_dominate_effective(obj, subj))
1811 return (EACCES);
1812
1813 return (0);
1814 }
1815
1816 static int
mls_proc_check_signal(struct ucred * cred,struct proc * p,int signum)1817 mls_proc_check_signal(struct ucred *cred, struct proc *p, int signum)
1818 {
1819 struct mac_mls *subj, *obj;
1820
1821 if (!mls_enabled)
1822 return (0);
1823
1824 subj = SLOT(cred->cr_label);
1825 obj = SLOT(p->p_ucred->cr_label);
1826
1827 /* XXX: range checks */
1828 if (!mls_dominate_effective(subj, obj))
1829 return (ESRCH);
1830 if (!mls_dominate_effective(obj, subj))
1831 return (EACCES);
1832
1833 return (0);
1834 }
1835
1836 static int
mls_socket_check_deliver(struct socket * so,struct label * solabel,struct mbuf * m,struct label * mlabel)1837 mls_socket_check_deliver(struct socket *so, struct label *solabel,
1838 struct mbuf *m, struct label *mlabel)
1839 {
1840 struct mac_mls *p, *s;
1841 int error;
1842
1843 if (!mls_enabled)
1844 return (0);
1845
1846 p = SLOT(mlabel);
1847 s = SLOT(solabel);
1848
1849 SOCK_LOCK(so);
1850 error = mls_equal_effective(p, s) ? 0 : EACCES;
1851 SOCK_UNLOCK(so);
1852
1853 return (error);
1854 }
1855
1856 static int
mls_socket_check_relabel(struct ucred * cred,struct socket * so,struct label * solabel,struct label * newlabel)1857 mls_socket_check_relabel(struct ucred *cred, struct socket *so,
1858 struct label *solabel, struct label *newlabel)
1859 {
1860 struct mac_mls *subj, *obj, *new;
1861 int error;
1862
1863 SOCK_LOCK_ASSERT(so);
1864
1865 new = SLOT(newlabel);
1866 subj = SLOT(cred->cr_label);
1867 obj = SLOT(solabel);
1868
1869 /*
1870 * If there is an MLS label update for the socket, it may be an
1871 * update of effective.
1872 */
1873 error = mls_atmostflags(new, MAC_MLS_FLAG_EFFECTIVE);
1874 if (error)
1875 return (error);
1876
1877 /*
1878 * To relabel a socket, the old socket effective must be in the
1879 * subject range.
1880 */
1881 if (!mls_effective_in_range(obj, subj))
1882 return (EPERM);
1883
1884 /*
1885 * If the MLS label is to be changed, authorize as appropriate.
1886 */
1887 if (new->mm_flags & MAC_MLS_FLAG_EFFECTIVE) {
1888 /*
1889 * To relabel a socket, the new socket effective must be in
1890 * the subject range.
1891 */
1892 if (!mls_effective_in_range(new, subj))
1893 return (EPERM);
1894
1895 /*
1896 * To change the MLS label on the socket to contain EQUAL,
1897 * the subject must have appropriate privilege.
1898 */
1899 if (mls_contains_equal(new)) {
1900 error = mls_subject_privileged(subj);
1901 if (error)
1902 return (error);
1903 }
1904 }
1905
1906 return (0);
1907 }
1908
1909 static int
mls_socket_check_visible(struct ucred * cred,struct socket * so,struct label * solabel)1910 mls_socket_check_visible(struct ucred *cred, struct socket *so,
1911 struct label *solabel)
1912 {
1913 struct mac_mls *subj, *obj;
1914
1915 if (!mls_enabled)
1916 return (0);
1917
1918 subj = SLOT(cred->cr_label);
1919 obj = SLOT(solabel);
1920
1921 SOCK_LOCK(so);
1922 if (!mls_dominate_effective(subj, obj)) {
1923 SOCK_UNLOCK(so);
1924 return (ENOENT);
1925 }
1926 SOCK_UNLOCK(so);
1927
1928 return (0);
1929 }
1930
1931 static void
mls_socket_create(struct ucred * cred,struct socket * so,struct label * solabel)1932 mls_socket_create(struct ucred *cred, struct socket *so,
1933 struct label *solabel)
1934 {
1935 struct mac_mls *source, *dest;
1936
1937 source = SLOT(cred->cr_label);
1938 dest = SLOT(solabel);
1939
1940 mls_copy_effective(source, dest);
1941 }
1942
1943 static void
mls_socket_create_mbuf(struct socket * so,struct label * solabel,struct mbuf * m,struct label * mlabel)1944 mls_socket_create_mbuf(struct socket *so, struct label *solabel,
1945 struct mbuf *m, struct label *mlabel)
1946 {
1947 struct mac_mls *source, *dest;
1948
1949 source = SLOT(solabel);
1950 dest = SLOT(mlabel);
1951
1952 SOCK_LOCK(so);
1953 mls_copy_effective(source, dest);
1954 SOCK_UNLOCK(so);
1955 }
1956
1957 static void
mls_socket_newconn(struct socket * oldso,struct label * oldsolabel,struct socket * newso,struct label * newsolabel)1958 mls_socket_newconn(struct socket *oldso, struct label *oldsolabel,
1959 struct socket *newso, struct label *newsolabel)
1960 {
1961 struct mac_mls source, *dest;
1962
1963 SOCK_LOCK(oldso);
1964 source = *SLOT(oldsolabel);
1965 SOCK_UNLOCK(oldso);
1966
1967 dest = SLOT(newsolabel);
1968
1969 SOCK_LOCK(newso);
1970 mls_copy_effective(&source, dest);
1971 SOCK_UNLOCK(newso);
1972 }
1973
1974 static void
mls_socket_relabel(struct ucred * cred,struct socket * so,struct label * solabel,struct label * newlabel)1975 mls_socket_relabel(struct ucred *cred, struct socket *so,
1976 struct label *solabel, struct label *newlabel)
1977 {
1978 struct mac_mls *source, *dest;
1979
1980 SOCK_LOCK_ASSERT(so);
1981
1982 source = SLOT(newlabel);
1983 dest = SLOT(solabel);
1984
1985 mls_copy(source, dest);
1986 }
1987
1988 static void
mls_socketpeer_set_from_mbuf(struct mbuf * m,struct label * mlabel,struct socket * so,struct label * sopeerlabel)1989 mls_socketpeer_set_from_mbuf(struct mbuf *m, struct label *mlabel,
1990 struct socket *so, struct label *sopeerlabel)
1991 {
1992 struct mac_mls *source, *dest;
1993
1994 source = SLOT(mlabel);
1995 dest = SLOT(sopeerlabel);
1996
1997 SOCK_LOCK(so);
1998 mls_copy_effective(source, dest);
1999 SOCK_UNLOCK(so);
2000 }
2001
2002 static void
mls_socketpeer_set_from_socket(struct socket * oldso,struct label * oldsolabel,struct socket * newso,struct label * newsopeerlabel)2003 mls_socketpeer_set_from_socket(struct socket *oldso,
2004 struct label *oldsolabel, struct socket *newso,
2005 struct label *newsopeerlabel)
2006 {
2007 struct mac_mls source, *dest;
2008
2009 SOCK_LOCK(oldso);
2010 source = *SLOT(oldsolabel);
2011 SOCK_UNLOCK(oldso);
2012
2013 dest = SLOT(newsopeerlabel);
2014
2015 SOCK_LOCK(newso);
2016 mls_copy_effective(&source, dest);
2017 SOCK_UNLOCK(newso);
2018 }
2019
2020 static void
mls_syncache_create(struct label * label,struct inpcb * inp)2021 mls_syncache_create(struct label *label, struct inpcb *inp)
2022 {
2023 struct mac_mls *source, *dest;
2024
2025 source = SLOT(inp->inp_label);
2026 dest = SLOT(label);
2027
2028 mls_copy_effective(source, dest);
2029 }
2030
2031 static void
mls_syncache_create_mbuf(struct label * sc_label,struct mbuf * m,struct label * mlabel)2032 mls_syncache_create_mbuf(struct label *sc_label, struct mbuf *m,
2033 struct label *mlabel)
2034 {
2035 struct mac_mls *source, *dest;
2036
2037 source = SLOT(sc_label);
2038 dest = SLOT(mlabel);
2039
2040 mls_copy_effective(source, dest);
2041 }
2042
2043 static int
mls_system_check_acct(struct ucred * cred,struct vnode * vp,struct label * vplabel)2044 mls_system_check_acct(struct ucred *cred, struct vnode *vp,
2045 struct label *vplabel)
2046 {
2047 struct mac_mls *subj, *obj;
2048
2049 if (!mls_enabled)
2050 return (0);
2051
2052 if (vplabel == NULL)
2053 return (0);
2054
2055 subj = SLOT(cred->cr_label);
2056 obj = SLOT(vplabel);
2057
2058 if (!mls_dominate_effective(obj, subj) ||
2059 !mls_dominate_effective(subj, obj))
2060 return (EACCES);
2061
2062 return (0);
2063 }
2064
2065 static int
mls_system_check_auditctl(struct ucred * cred,struct vnode * vp,struct label * vplabel)2066 mls_system_check_auditctl(struct ucred *cred, struct vnode *vp,
2067 struct label *vplabel)
2068 {
2069 struct mac_mls *subj, *obj;
2070
2071 if (!mls_enabled)
2072 return (0);
2073
2074 subj = SLOT(cred->cr_label);
2075 obj = SLOT(vplabel);
2076
2077 if (!mls_dominate_effective(obj, subj) ||
2078 !mls_dominate_effective(subj, obj))
2079 return (EACCES);
2080
2081 return (0);
2082 }
2083
2084 static int
mls_system_check_swapon(struct ucred * cred,struct vnode * vp,struct label * vplabel)2085 mls_system_check_swapon(struct ucred *cred, struct vnode *vp,
2086 struct label *vplabel)
2087 {
2088 struct mac_mls *subj, *obj;
2089
2090 if (!mls_enabled)
2091 return (0);
2092
2093 subj = SLOT(cred->cr_label);
2094 obj = SLOT(vplabel);
2095
2096 if (!mls_dominate_effective(obj, subj) ||
2097 !mls_dominate_effective(subj, obj))
2098 return (EACCES);
2099
2100 return (0);
2101 }
2102
2103 static void
mls_sysvmsg_cleanup(struct label * msglabel)2104 mls_sysvmsg_cleanup(struct label *msglabel)
2105 {
2106
2107 bzero(SLOT(msglabel), sizeof(struct mac_mls));
2108 }
2109
2110 static void
mls_sysvmsg_create(struct ucred * cred,struct msqid_kernel * msqkptr,struct label * msqlabel,struct msg * msgptr,struct label * msglabel)2111 mls_sysvmsg_create(struct ucred *cred, struct msqid_kernel *msqkptr,
2112 struct label *msqlabel, struct msg *msgptr, struct label *msglabel)
2113 {
2114 struct mac_mls *source, *dest;
2115
2116 /* Ignore the msgq label. */
2117 source = SLOT(cred->cr_label);
2118 dest = SLOT(msglabel);
2119
2120 mls_copy_effective(source, dest);
2121 }
2122
2123 static int
mls_sysvmsq_check_msgrcv(struct ucred * cred,struct msg * msgptr,struct label * msglabel)2124 mls_sysvmsq_check_msgrcv(struct ucred *cred, struct msg *msgptr,
2125 struct label *msglabel)
2126 {
2127 struct mac_mls *subj, *obj;
2128
2129 if (!mls_enabled)
2130 return (0);
2131
2132 subj = SLOT(cred->cr_label);
2133 obj = SLOT(msglabel);
2134
2135 if (!mls_dominate_effective(subj, obj))
2136 return (EACCES);
2137
2138 return (0);
2139 }
2140
2141 static int
mls_sysvmsq_check_msgrmid(struct ucred * cred,struct msg * msgptr,struct label * msglabel)2142 mls_sysvmsq_check_msgrmid(struct ucred *cred, struct msg *msgptr,
2143 struct label *msglabel)
2144 {
2145 struct mac_mls *subj, *obj;
2146
2147 if (!mls_enabled)
2148 return (0);
2149
2150 subj = SLOT(cred->cr_label);
2151 obj = SLOT(msglabel);
2152
2153 if (!mls_dominate_effective(obj, subj))
2154 return (EACCES);
2155
2156 return (0);
2157 }
2158
2159 static int
mls_sysvmsq_check_msqget(struct ucred * cred,struct msqid_kernel * msqkptr,struct label * msqklabel)2160 mls_sysvmsq_check_msqget(struct ucred *cred, struct msqid_kernel *msqkptr,
2161 struct label *msqklabel)
2162 {
2163 struct mac_mls *subj, *obj;
2164
2165 if (!mls_enabled)
2166 return (0);
2167
2168 subj = SLOT(cred->cr_label);
2169 obj = SLOT(msqklabel);
2170
2171 if (!mls_dominate_effective(subj, obj))
2172 return (EACCES);
2173
2174 return (0);
2175 }
2176
2177 static int
mls_sysvmsq_check_msqsnd(struct ucred * cred,struct msqid_kernel * msqkptr,struct label * msqklabel)2178 mls_sysvmsq_check_msqsnd(struct ucred *cred, struct msqid_kernel *msqkptr,
2179 struct label *msqklabel)
2180 {
2181 struct mac_mls *subj, *obj;
2182
2183 if (!mls_enabled)
2184 return (0);
2185
2186 subj = SLOT(cred->cr_label);
2187 obj = SLOT(msqklabel);
2188
2189 if (!mls_dominate_effective(obj, subj))
2190 return (EACCES);
2191
2192 return (0);
2193 }
2194
2195 static int
mls_sysvmsq_check_msqrcv(struct ucred * cred,struct msqid_kernel * msqkptr,struct label * msqklabel)2196 mls_sysvmsq_check_msqrcv(struct ucred *cred, struct msqid_kernel *msqkptr,
2197 struct label *msqklabel)
2198 {
2199 struct mac_mls *subj, *obj;
2200
2201 if (!mls_enabled)
2202 return (0);
2203
2204 subj = SLOT(cred->cr_label);
2205 obj = SLOT(msqklabel);
2206
2207 if (!mls_dominate_effective(subj, obj))
2208 return (EACCES);
2209
2210 return (0);
2211 }
2212
2213 static int
mls_sysvmsq_check_msqctl(struct ucred * cred,struct msqid_kernel * msqkptr,struct label * msqklabel,int cmd)2214 mls_sysvmsq_check_msqctl(struct ucred *cred, struct msqid_kernel *msqkptr,
2215 struct label *msqklabel, int cmd)
2216 {
2217 struct mac_mls *subj, *obj;
2218
2219 if (!mls_enabled)
2220 return (0);
2221
2222 subj = SLOT(cred->cr_label);
2223 obj = SLOT(msqklabel);
2224
2225 switch(cmd) {
2226 case IPC_RMID:
2227 case IPC_SET:
2228 if (!mls_dominate_effective(obj, subj))
2229 return (EACCES);
2230 break;
2231
2232 case IPC_STAT:
2233 if (!mls_dominate_effective(subj, obj))
2234 return (EACCES);
2235 break;
2236
2237 default:
2238 return (EACCES);
2239 }
2240
2241 return (0);
2242 }
2243
2244 static void
mls_sysvmsq_cleanup(struct label * msqlabel)2245 mls_sysvmsq_cleanup(struct label *msqlabel)
2246 {
2247
2248 bzero(SLOT(msqlabel), sizeof(struct mac_mls));
2249 }
2250
2251 static void
mls_sysvmsq_create(struct ucred * cred,struct msqid_kernel * msqkptr,struct label * msqlabel)2252 mls_sysvmsq_create(struct ucred *cred, struct msqid_kernel *msqkptr,
2253 struct label *msqlabel)
2254 {
2255 struct mac_mls *source, *dest;
2256
2257 source = SLOT(cred->cr_label);
2258 dest = SLOT(msqlabel);
2259
2260 mls_copy_effective(source, dest);
2261 }
2262
2263 static int
mls_sysvsem_check_semctl(struct ucred * cred,struct semid_kernel * semakptr,struct label * semaklabel,int cmd)2264 mls_sysvsem_check_semctl(struct ucred *cred, struct semid_kernel *semakptr,
2265 struct label *semaklabel, int cmd)
2266 {
2267 struct mac_mls *subj, *obj;
2268
2269 if (!mls_enabled)
2270 return (0);
2271
2272 subj = SLOT(cred->cr_label);
2273 obj = SLOT(semaklabel);
2274
2275 switch(cmd) {
2276 case IPC_RMID:
2277 case IPC_SET:
2278 case SETVAL:
2279 case SETALL:
2280 if (!mls_dominate_effective(obj, subj))
2281 return (EACCES);
2282 break;
2283
2284 case IPC_STAT:
2285 case GETVAL:
2286 case GETPID:
2287 case GETNCNT:
2288 case GETZCNT:
2289 case GETALL:
2290 if (!mls_dominate_effective(subj, obj))
2291 return (EACCES);
2292 break;
2293
2294 default:
2295 return (EACCES);
2296 }
2297
2298 return (0);
2299 }
2300
2301 static int
mls_sysvsem_check_semget(struct ucred * cred,struct semid_kernel * semakptr,struct label * semaklabel)2302 mls_sysvsem_check_semget(struct ucred *cred, struct semid_kernel *semakptr,
2303 struct label *semaklabel)
2304 {
2305 struct mac_mls *subj, *obj;
2306
2307 if (!mls_enabled)
2308 return (0);
2309
2310 subj = SLOT(cred->cr_label);
2311 obj = SLOT(semaklabel);
2312
2313 if (!mls_dominate_effective(subj, obj))
2314 return (EACCES);
2315
2316 return (0);
2317 }
2318
2319 static int
mls_sysvsem_check_semop(struct ucred * cred,struct semid_kernel * semakptr,struct label * semaklabel,size_t accesstype)2320 mls_sysvsem_check_semop(struct ucred *cred, struct semid_kernel *semakptr,
2321 struct label *semaklabel, size_t accesstype)
2322 {
2323 struct mac_mls *subj, *obj;
2324
2325 if (!mls_enabled)
2326 return (0);
2327
2328 subj = SLOT(cred->cr_label);
2329 obj = SLOT(semaklabel);
2330
2331 if( accesstype & SEM_R )
2332 if (!mls_dominate_effective(subj, obj))
2333 return (EACCES);
2334
2335 if( accesstype & SEM_A )
2336 if (!mls_dominate_effective(obj, subj))
2337 return (EACCES);
2338
2339 return (0);
2340 }
2341
2342 static void
mls_sysvsem_cleanup(struct label * semalabel)2343 mls_sysvsem_cleanup(struct label *semalabel)
2344 {
2345
2346 bzero(SLOT(semalabel), sizeof(struct mac_mls));
2347 }
2348
2349 static void
mls_sysvsem_create(struct ucred * cred,struct semid_kernel * semakptr,struct label * semalabel)2350 mls_sysvsem_create(struct ucred *cred, struct semid_kernel *semakptr,
2351 struct label *semalabel)
2352 {
2353 struct mac_mls *source, *dest;
2354
2355 source = SLOT(cred->cr_label);
2356 dest = SLOT(semalabel);
2357
2358 mls_copy_effective(source, dest);
2359 }
2360
2361 static int
mls_sysvshm_check_shmat(struct ucred * cred,struct shmid_kernel * shmsegptr,struct label * shmseglabel,int shmflg)2362 mls_sysvshm_check_shmat(struct ucred *cred, struct shmid_kernel *shmsegptr,
2363 struct label *shmseglabel, int shmflg)
2364 {
2365 struct mac_mls *subj, *obj;
2366
2367 if (!mls_enabled)
2368 return (0);
2369
2370 subj = SLOT(cred->cr_label);
2371 obj = SLOT(shmseglabel);
2372
2373 if (!mls_dominate_effective(subj, obj))
2374 return (EACCES);
2375 if ((shmflg & SHM_RDONLY) == 0) {
2376 if (!mls_dominate_effective(obj, subj))
2377 return (EACCES);
2378 }
2379
2380 return (0);
2381 }
2382
2383 static int
mls_sysvshm_check_shmctl(struct ucred * cred,struct shmid_kernel * shmsegptr,struct label * shmseglabel,int cmd)2384 mls_sysvshm_check_shmctl(struct ucred *cred, struct shmid_kernel *shmsegptr,
2385 struct label *shmseglabel, int cmd)
2386 {
2387 struct mac_mls *subj, *obj;
2388
2389 if (!mls_enabled)
2390 return (0);
2391
2392 subj = SLOT(cred->cr_label);
2393 obj = SLOT(shmseglabel);
2394
2395 switch(cmd) {
2396 case IPC_RMID:
2397 case IPC_SET:
2398 if (!mls_dominate_effective(obj, subj))
2399 return (EACCES);
2400 break;
2401
2402 case IPC_STAT:
2403 case SHM_STAT:
2404 if (!mls_dominate_effective(subj, obj))
2405 return (EACCES);
2406 break;
2407
2408 default:
2409 return (EACCES);
2410 }
2411
2412 return (0);
2413 }
2414
2415 static int
mls_sysvshm_check_shmget(struct ucred * cred,struct shmid_kernel * shmsegptr,struct label * shmseglabel,int shmflg)2416 mls_sysvshm_check_shmget(struct ucred *cred, struct shmid_kernel *shmsegptr,
2417 struct label *shmseglabel, int shmflg)
2418 {
2419 struct mac_mls *subj, *obj;
2420
2421 if (!mls_enabled)
2422 return (0);
2423
2424 subj = SLOT(cred->cr_label);
2425 obj = SLOT(shmseglabel);
2426
2427 if (!mls_dominate_effective(obj, subj))
2428 return (EACCES);
2429
2430 return (0);
2431 }
2432
2433 static void
mls_sysvshm_cleanup(struct label * shmlabel)2434 mls_sysvshm_cleanup(struct label *shmlabel)
2435 {
2436
2437 bzero(SLOT(shmlabel), sizeof(struct mac_mls));
2438 }
2439
2440 static void
mls_sysvshm_create(struct ucred * cred,struct shmid_kernel * shmsegptr,struct label * shmlabel)2441 mls_sysvshm_create(struct ucred *cred, struct shmid_kernel *shmsegptr,
2442 struct label *shmlabel)
2443 {
2444 struct mac_mls *source, *dest;
2445
2446 source = SLOT(cred->cr_label);
2447 dest = SLOT(shmlabel);
2448
2449 mls_copy_effective(source, dest);
2450 }
2451
2452 static int
mls_vnode_associate_extattr(struct mount * mp,struct label * mplabel,struct vnode * vp,struct label * vplabel)2453 mls_vnode_associate_extattr(struct mount *mp, struct label *mplabel,
2454 struct vnode *vp, struct label *vplabel)
2455 {
2456 struct mac_mls mm_temp, *source, *dest;
2457 int buflen, error;
2458
2459 source = SLOT(mplabel);
2460 dest = SLOT(vplabel);
2461
2462 buflen = sizeof(mm_temp);
2463 bzero(&mm_temp, buflen);
2464
2465 error = vn_extattr_get(vp, IO_NODELOCKED, MAC_MLS_EXTATTR_NAMESPACE,
2466 MAC_MLS_EXTATTR_NAME, &buflen, (char *) &mm_temp, curthread);
2467 if (error == ENOATTR || error == EOPNOTSUPP) {
2468 /* Fall back to the mntlabel. */
2469 mls_copy_effective(source, dest);
2470 return (0);
2471 } else if (error)
2472 return (error);
2473
2474 if (buflen != sizeof(mm_temp)) {
2475 printf("mls_vnode_associate_extattr: bad size %d\n", buflen);
2476 return (EPERM);
2477 }
2478 if (mls_valid(&mm_temp) != 0) {
2479 printf("mls_vnode_associate_extattr: invalid\n");
2480 return (EPERM);
2481 }
2482 if ((mm_temp.mm_flags & MAC_MLS_FLAGS_BOTH) !=
2483 MAC_MLS_FLAG_EFFECTIVE) {
2484 printf("mls_associated_vnode_extattr: not effective\n");
2485 return (EPERM);
2486 }
2487
2488 mls_copy_effective(&mm_temp, dest);
2489 return (0);
2490 }
2491
2492 static void
mls_vnode_associate_singlelabel(struct mount * mp,struct label * mplabel,struct vnode * vp,struct label * vplabel)2493 mls_vnode_associate_singlelabel(struct mount *mp, struct label *mplabel,
2494 struct vnode *vp, struct label *vplabel)
2495 {
2496 struct mac_mls *source, *dest;
2497
2498 source = SLOT(mplabel);
2499 dest = SLOT(vplabel);
2500
2501 mls_copy_effective(source, dest);
2502 }
2503
2504 static int
mls_vnode_check_chdir(struct ucred * cred,struct vnode * dvp,struct label * dvplabel)2505 mls_vnode_check_chdir(struct ucred *cred, struct vnode *dvp,
2506 struct label *dvplabel)
2507 {
2508 struct mac_mls *subj, *obj;
2509
2510 if (!mls_enabled)
2511 return (0);
2512
2513 subj = SLOT(cred->cr_label);
2514 obj = SLOT(dvplabel);
2515
2516 if (!mls_dominate_effective(subj, obj))
2517 return (EACCES);
2518
2519 return (0);
2520 }
2521
2522 static int
mls_vnode_check_chroot(struct ucred * cred,struct vnode * dvp,struct label * dvplabel)2523 mls_vnode_check_chroot(struct ucred *cred, struct vnode *dvp,
2524 struct label *dvplabel)
2525 {
2526 struct mac_mls *subj, *obj;
2527
2528 if (!mls_enabled)
2529 return (0);
2530
2531 subj = SLOT(cred->cr_label);
2532 obj = SLOT(dvplabel);
2533
2534 if (!mls_dominate_effective(subj, obj))
2535 return (EACCES);
2536
2537 return (0);
2538 }
2539
2540 static int
mls_vnode_check_create(struct ucred * cred,struct vnode * dvp,struct label * dvplabel,struct componentname * cnp,struct vattr * vap)2541 mls_vnode_check_create(struct ucred *cred, struct vnode *dvp,
2542 struct label *dvplabel, struct componentname *cnp, struct vattr *vap)
2543 {
2544 struct mac_mls *subj, *obj;
2545
2546 if (!mls_enabled)
2547 return (0);
2548
2549 subj = SLOT(cred->cr_label);
2550 obj = SLOT(dvplabel);
2551
2552 if (!mls_dominate_effective(obj, subj))
2553 return (EACCES);
2554
2555 return (0);
2556 }
2557
2558 static int
mls_vnode_check_deleteacl(struct ucred * cred,struct vnode * vp,struct label * vplabel,acl_type_t type)2559 mls_vnode_check_deleteacl(struct ucred *cred, struct vnode *vp,
2560 struct label *vplabel, acl_type_t type)
2561 {
2562 struct mac_mls *subj, *obj;
2563
2564 if (!mls_enabled)
2565 return (0);
2566
2567 subj = SLOT(cred->cr_label);
2568 obj = SLOT(vplabel);
2569
2570 if (!mls_dominate_effective(obj, subj))
2571 return (EACCES);
2572
2573 return (0);
2574 }
2575
2576 static int
mls_vnode_check_deleteextattr(struct ucred * cred,struct vnode * vp,struct label * vplabel,int attrnamespace,const char * name)2577 mls_vnode_check_deleteextattr(struct ucred *cred, struct vnode *vp,
2578 struct label *vplabel, int attrnamespace, const char *name)
2579 {
2580 struct mac_mls *subj, *obj;
2581
2582 if (!mls_enabled)
2583 return (0);
2584
2585 subj = SLOT(cred->cr_label);
2586 obj = SLOT(vplabel);
2587
2588 if (!mls_dominate_effective(obj, subj))
2589 return (EACCES);
2590
2591 return (0);
2592 }
2593
2594 static int
mls_vnode_check_exec(struct ucred * cred,struct vnode * vp,struct label * vplabel,struct image_params * imgp,struct label * execlabel)2595 mls_vnode_check_exec(struct ucred *cred, struct vnode *vp,
2596 struct label *vplabel, struct image_params *imgp,
2597 struct label *execlabel)
2598 {
2599 struct mac_mls *subj, *obj, *exec;
2600 int error;
2601
2602 if (execlabel != NULL) {
2603 /*
2604 * We currently don't permit labels to be changed at
2605 * exec-time as part of MLS, so disallow non-NULL MLS label
2606 * elements in the execlabel.
2607 */
2608 exec = SLOT(execlabel);
2609 error = mls_atmostflags(exec, 0);
2610 if (error)
2611 return (error);
2612 }
2613
2614 if (!mls_enabled)
2615 return (0);
2616
2617 subj = SLOT(cred->cr_label);
2618 obj = SLOT(vplabel);
2619
2620 if (!mls_dominate_effective(subj, obj))
2621 return (EACCES);
2622
2623 return (0);
2624 }
2625
2626 static int
mls_vnode_check_getacl(struct ucred * cred,struct vnode * vp,struct label * vplabel,acl_type_t type)2627 mls_vnode_check_getacl(struct ucred *cred, struct vnode *vp,
2628 struct label *vplabel, acl_type_t type)
2629 {
2630 struct mac_mls *subj, *obj;
2631
2632 if (!mls_enabled)
2633 return (0);
2634
2635 subj = SLOT(cred->cr_label);
2636 obj = SLOT(vplabel);
2637
2638 if (!mls_dominate_effective(subj, obj))
2639 return (EACCES);
2640
2641 return (0);
2642 }
2643
2644 static int
mls_vnode_check_getextattr(struct ucred * cred,struct vnode * vp,struct label * vplabel,int attrnamespace,const char * name)2645 mls_vnode_check_getextattr(struct ucred *cred, struct vnode *vp,
2646 struct label *vplabel, int attrnamespace, const char *name)
2647 {
2648 struct mac_mls *subj, *obj;
2649
2650 if (!mls_enabled)
2651 return (0);
2652
2653 subj = SLOT(cred->cr_label);
2654 obj = SLOT(vplabel);
2655
2656 if (!mls_dominate_effective(subj, obj))
2657 return (EACCES);
2658
2659 return (0);
2660 }
2661
2662 static int
mls_vnode_check_link(struct ucred * cred,struct vnode * dvp,struct label * dvplabel,struct vnode * vp,struct label * vplabel,struct componentname * cnp)2663 mls_vnode_check_link(struct ucred *cred, struct vnode *dvp,
2664 struct label *dvplabel, struct vnode *vp, struct label *vplabel,
2665 struct componentname *cnp)
2666 {
2667 struct mac_mls *subj, *obj;
2668
2669 if (!mls_enabled)
2670 return (0);
2671
2672 subj = SLOT(cred->cr_label);
2673 obj = SLOT(dvplabel);
2674
2675 if (!mls_dominate_effective(obj, subj))
2676 return (EACCES);
2677
2678 obj = SLOT(vplabel);
2679 if (!mls_dominate_effective(obj, subj))
2680 return (EACCES);
2681
2682 return (0);
2683 }
2684
2685 static int
mls_vnode_check_listextattr(struct ucred * cred,struct vnode * vp,struct label * vplabel,int attrnamespace)2686 mls_vnode_check_listextattr(struct ucred *cred, struct vnode *vp,
2687 struct label *vplabel, int attrnamespace)
2688 {
2689
2690 struct mac_mls *subj, *obj;
2691
2692 if (!mls_enabled)
2693 return (0);
2694
2695 subj = SLOT(cred->cr_label);
2696 obj = SLOT(vplabel);
2697
2698 if (!mls_dominate_effective(subj, obj))
2699 return (EACCES);
2700
2701 return (0);
2702 }
2703
2704 static int
mls_vnode_check_lookup(struct ucred * cred,struct vnode * dvp,struct label * dvplabel,struct componentname * cnp)2705 mls_vnode_check_lookup(struct ucred *cred, struct vnode *dvp,
2706 struct label *dvplabel, struct componentname *cnp)
2707 {
2708 struct mac_mls *subj, *obj;
2709
2710 if (!mls_enabled)
2711 return (0);
2712
2713 subj = SLOT(cred->cr_label);
2714 obj = SLOT(dvplabel);
2715
2716 if (!mls_dominate_effective(subj, obj))
2717 return (EACCES);
2718
2719 return (0);
2720 }
2721
2722 static int
mls_vnode_check_mmap(struct ucred * cred,struct vnode * vp,struct label * vplabel,int prot,int flags)2723 mls_vnode_check_mmap(struct ucred *cred, struct vnode *vp,
2724 struct label *vplabel, int prot, int flags)
2725 {
2726 struct mac_mls *subj, *obj;
2727
2728 /*
2729 * Rely on the use of open()-time protections to handle
2730 * non-revocation cases.
2731 */
2732 if (!mls_enabled || !revocation_enabled)
2733 return (0);
2734
2735 subj = SLOT(cred->cr_label);
2736 obj = SLOT(vplabel);
2737
2738 if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) {
2739 if (!mls_dominate_effective(subj, obj))
2740 return (EACCES);
2741 }
2742 if (((prot & VM_PROT_WRITE) != 0) && ((flags & MAP_SHARED) != 0)) {
2743 if (!mls_dominate_effective(obj, subj))
2744 return (EACCES);
2745 }
2746
2747 return (0);
2748 }
2749
2750 static int
mls_vnode_check_open(struct ucred * cred,struct vnode * vp,struct label * vplabel,accmode_t accmode)2751 mls_vnode_check_open(struct ucred *cred, struct vnode *vp,
2752 struct label *vplabel, accmode_t accmode)
2753 {
2754 struct mac_mls *subj, *obj;
2755
2756 if (!mls_enabled)
2757 return (0);
2758
2759 subj = SLOT(cred->cr_label);
2760 obj = SLOT(vplabel);
2761
2762 /* XXX privilege override for admin? */
2763 if (accmode & (VREAD | VEXEC | VSTAT_PERMS)) {
2764 if (!mls_dominate_effective(subj, obj))
2765 return (EACCES);
2766 }
2767 if (accmode & VMODIFY_PERMS) {
2768 if (!mls_dominate_effective(obj, subj))
2769 return (EACCES);
2770 }
2771
2772 return (0);
2773 }
2774
2775 static int
mls_vnode_check_poll(struct ucred * active_cred,struct ucred * file_cred,struct vnode * vp,struct label * vplabel)2776 mls_vnode_check_poll(struct ucred *active_cred, struct ucred *file_cred,
2777 struct vnode *vp, struct label *vplabel)
2778 {
2779 struct mac_mls *subj, *obj;
2780
2781 if (!mls_enabled || !revocation_enabled)
2782 return (0);
2783
2784 subj = SLOT(active_cred->cr_label);
2785 obj = SLOT(vplabel);
2786
2787 if (!mls_dominate_effective(subj, obj))
2788 return (EACCES);
2789
2790 return (0);
2791 }
2792
2793 static int
mls_vnode_check_read(struct ucred * active_cred,struct ucred * file_cred,struct vnode * vp,struct label * vplabel)2794 mls_vnode_check_read(struct ucred *active_cred, struct ucred *file_cred,
2795 struct vnode *vp, struct label *vplabel)
2796 {
2797 struct mac_mls *subj, *obj;
2798
2799 if (!mls_enabled || !revocation_enabled)
2800 return (0);
2801
2802 subj = SLOT(active_cred->cr_label);
2803 obj = SLOT(vplabel);
2804
2805 if (!mls_dominate_effective(subj, obj))
2806 return (EACCES);
2807
2808 return (0);
2809 }
2810
2811 static int
mls_vnode_check_readdir(struct ucred * cred,struct vnode * dvp,struct label * dvplabel)2812 mls_vnode_check_readdir(struct ucred *cred, struct vnode *dvp,
2813 struct label *dvplabel)
2814 {
2815 struct mac_mls *subj, *obj;
2816
2817 if (!mls_enabled)
2818 return (0);
2819
2820 subj = SLOT(cred->cr_label);
2821 obj = SLOT(dvplabel);
2822
2823 if (!mls_dominate_effective(subj, obj))
2824 return (EACCES);
2825
2826 return (0);
2827 }
2828
2829 static int
mls_vnode_check_readlink(struct ucred * cred,struct vnode * vp,struct label * vplabel)2830 mls_vnode_check_readlink(struct ucred *cred, struct vnode *vp,
2831 struct label *vplabel)
2832 {
2833 struct mac_mls *subj, *obj;
2834
2835 if (!mls_enabled)
2836 return (0);
2837
2838 subj = SLOT(cred->cr_label);
2839 obj = SLOT(vplabel);
2840
2841 if (!mls_dominate_effective(subj, obj))
2842 return (EACCES);
2843
2844 return (0);
2845 }
2846
2847 static int
mls_vnode_check_relabel(struct ucred * cred,struct vnode * vp,struct label * vplabel,struct label * newlabel)2848 mls_vnode_check_relabel(struct ucred *cred, struct vnode *vp,
2849 struct label *vplabel, struct label *newlabel)
2850 {
2851 struct mac_mls *old, *new, *subj;
2852 int error;
2853
2854 old = SLOT(vplabel);
2855 new = SLOT(newlabel);
2856 subj = SLOT(cred->cr_label);
2857
2858 /*
2859 * If there is an MLS label update for the vnode, it must be a
2860 * effective label.
2861 */
2862 error = mls_atmostflags(new, MAC_MLS_FLAG_EFFECTIVE);
2863 if (error)
2864 return (error);
2865
2866 /*
2867 * To perform a relabel of the vnode (MLS label or not), MLS must
2868 * authorize the relabel.
2869 */
2870 if (!mls_effective_in_range(old, subj))
2871 return (EPERM);
2872
2873 /*
2874 * If the MLS label is to be changed, authorize as appropriate.
2875 */
2876 if (new->mm_flags & MAC_MLS_FLAG_EFFECTIVE) {
2877 /*
2878 * To change the MLS label on a vnode, the new vnode label
2879 * must be in the subject range.
2880 */
2881 if (!mls_effective_in_range(new, subj))
2882 return (EPERM);
2883
2884 /*
2885 * To change the MLS label on the vnode to be EQUAL, the
2886 * subject must have appropriate privilege.
2887 */
2888 if (mls_contains_equal(new)) {
2889 error = mls_subject_privileged(subj);
2890 if (error)
2891 return (error);
2892 }
2893 }
2894
2895 return (0);
2896 }
2897
2898 static int
mls_vnode_check_rename_from(struct ucred * cred,struct vnode * dvp,struct label * dvplabel,struct vnode * vp,struct label * vplabel,struct componentname * cnp)2899 mls_vnode_check_rename_from(struct ucred *cred, struct vnode *dvp,
2900 struct label *dvplabel, struct vnode *vp, struct label *vplabel,
2901 struct componentname *cnp)
2902 {
2903 struct mac_mls *subj, *obj;
2904
2905 if (!mls_enabled)
2906 return (0);
2907
2908 subj = SLOT(cred->cr_label);
2909 obj = SLOT(dvplabel);
2910
2911 if (!mls_dominate_effective(obj, subj))
2912 return (EACCES);
2913
2914 obj = SLOT(vplabel);
2915
2916 if (!mls_dominate_effective(obj, subj))
2917 return (EACCES);
2918
2919 return (0);
2920 }
2921
2922 static int
mls_vnode_check_rename_to(struct ucred * cred,struct vnode * dvp,struct label * dvplabel,struct vnode * vp,struct label * vplabel,int samedir,struct componentname * cnp)2923 mls_vnode_check_rename_to(struct ucred *cred, struct vnode *dvp,
2924 struct label *dvplabel, struct vnode *vp, struct label *vplabel,
2925 int samedir, struct componentname *cnp)
2926 {
2927 struct mac_mls *subj, *obj;
2928
2929 if (!mls_enabled)
2930 return (0);
2931
2932 subj = SLOT(cred->cr_label);
2933 obj = SLOT(dvplabel);
2934
2935 if (!mls_dominate_effective(obj, subj))
2936 return (EACCES);
2937
2938 if (vp != NULL) {
2939 obj = SLOT(vplabel);
2940
2941 if (!mls_dominate_effective(obj, subj))
2942 return (EACCES);
2943 }
2944
2945 return (0);
2946 }
2947
2948 static int
mls_vnode_check_revoke(struct ucred * cred,struct vnode * vp,struct label * vplabel)2949 mls_vnode_check_revoke(struct ucred *cred, struct vnode *vp,
2950 struct label *vplabel)
2951 {
2952 struct mac_mls *subj, *obj;
2953
2954 if (!mls_enabled)
2955 return (0);
2956
2957 subj = SLOT(cred->cr_label);
2958 obj = SLOT(vplabel);
2959
2960 if (!mls_dominate_effective(obj, subj))
2961 return (EACCES);
2962
2963 return (0);
2964 }
2965
2966 static int
mls_vnode_check_setacl(struct ucred * cred,struct vnode * vp,struct label * vplabel,acl_type_t type,struct acl * acl)2967 mls_vnode_check_setacl(struct ucred *cred, struct vnode *vp,
2968 struct label *vplabel, acl_type_t type, struct acl *acl)
2969 {
2970 struct mac_mls *subj, *obj;
2971
2972 if (!mls_enabled)
2973 return (0);
2974
2975 subj = SLOT(cred->cr_label);
2976 obj = SLOT(vplabel);
2977
2978 if (!mls_dominate_effective(obj, subj))
2979 return (EACCES);
2980
2981 return (0);
2982 }
2983
2984 static int
mls_vnode_check_setextattr(struct ucred * cred,struct vnode * vp,struct label * vplabel,int attrnamespace,const char * name)2985 mls_vnode_check_setextattr(struct ucred *cred, struct vnode *vp,
2986 struct label *vplabel, int attrnamespace, const char *name)
2987 {
2988 struct mac_mls *subj, *obj;
2989
2990 if (!mls_enabled)
2991 return (0);
2992
2993 subj = SLOT(cred->cr_label);
2994 obj = SLOT(vplabel);
2995
2996 if (!mls_dominate_effective(obj, subj))
2997 return (EACCES);
2998
2999 /* XXX: protect the MAC EA in a special way? */
3000
3001 return (0);
3002 }
3003
3004 static int
mls_vnode_check_setflags(struct ucred * cred,struct vnode * vp,struct label * vplabel,u_long flags)3005 mls_vnode_check_setflags(struct ucred *cred, struct vnode *vp,
3006 struct label *vplabel, u_long flags)
3007 {
3008 struct mac_mls *subj, *obj;
3009
3010 if (!mls_enabled)
3011 return (0);
3012
3013 subj = SLOT(cred->cr_label);
3014 obj = SLOT(vplabel);
3015
3016 if (!mls_dominate_effective(obj, subj))
3017 return (EACCES);
3018
3019 return (0);
3020 }
3021
3022 static int
mls_vnode_check_setmode(struct ucred * cred,struct vnode * vp,struct label * vplabel,mode_t mode)3023 mls_vnode_check_setmode(struct ucred *cred, struct vnode *vp,
3024 struct label *vplabel, mode_t mode)
3025 {
3026 struct mac_mls *subj, *obj;
3027
3028 if (!mls_enabled)
3029 return (0);
3030
3031 subj = SLOT(cred->cr_label);
3032 obj = SLOT(vplabel);
3033
3034 if (!mls_dominate_effective(obj, subj))
3035 return (EACCES);
3036
3037 return (0);
3038 }
3039
3040 static int
mls_vnode_check_setowner(struct ucred * cred,struct vnode * vp,struct label * vplabel,uid_t uid,gid_t gid)3041 mls_vnode_check_setowner(struct ucred *cred, struct vnode *vp,
3042 struct label *vplabel, uid_t uid, gid_t gid)
3043 {
3044 struct mac_mls *subj, *obj;
3045
3046 if (!mls_enabled)
3047 return (0);
3048
3049 subj = SLOT(cred->cr_label);
3050 obj = SLOT(vplabel);
3051
3052 if (!mls_dominate_effective(obj, subj))
3053 return (EACCES);
3054
3055 return (0);
3056 }
3057
3058 static int
mls_vnode_check_setutimes(struct ucred * cred,struct vnode * vp,struct label * vplabel,struct timespec atime,struct timespec mtime)3059 mls_vnode_check_setutimes(struct ucred *cred, struct vnode *vp,
3060 struct label *vplabel, struct timespec atime, struct timespec mtime)
3061 {
3062 struct mac_mls *subj, *obj;
3063
3064 if (!mls_enabled)
3065 return (0);
3066
3067 subj = SLOT(cred->cr_label);
3068 obj = SLOT(vplabel);
3069
3070 if (!mls_dominate_effective(obj, subj))
3071 return (EACCES);
3072
3073 return (0);
3074 }
3075
3076 static int
mls_vnode_check_stat(struct ucred * active_cred,struct ucred * file_cred,struct vnode * vp,struct label * vplabel)3077 mls_vnode_check_stat(struct ucred *active_cred, struct ucred *file_cred,
3078 struct vnode *vp, struct label *vplabel)
3079 {
3080 struct mac_mls *subj, *obj;
3081
3082 if (!mls_enabled)
3083 return (0);
3084
3085 subj = SLOT(active_cred->cr_label);
3086 obj = SLOT(vplabel);
3087
3088 if (!mls_dominate_effective(subj, obj))
3089 return (EACCES);
3090
3091 return (0);
3092 }
3093
3094 static int
mls_vnode_check_unlink(struct ucred * cred,struct vnode * dvp,struct label * dvplabel,struct vnode * vp,struct label * vplabel,struct componentname * cnp)3095 mls_vnode_check_unlink(struct ucred *cred, struct vnode *dvp,
3096 struct label *dvplabel, struct vnode *vp, struct label *vplabel,
3097 struct componentname *cnp)
3098 {
3099 struct mac_mls *subj, *obj;
3100
3101 if (!mls_enabled)
3102 return (0);
3103
3104 subj = SLOT(cred->cr_label);
3105 obj = SLOT(dvplabel);
3106
3107 if (!mls_dominate_effective(obj, subj))
3108 return (EACCES);
3109
3110 obj = SLOT(vplabel);
3111
3112 if (!mls_dominate_effective(obj, subj))
3113 return (EACCES);
3114
3115 return (0);
3116 }
3117
3118 static int
mls_vnode_check_write(struct ucred * active_cred,struct ucred * file_cred,struct vnode * vp,struct label * vplabel)3119 mls_vnode_check_write(struct ucred *active_cred, struct ucred *file_cred,
3120 struct vnode *vp, struct label *vplabel)
3121 {
3122 struct mac_mls *subj, *obj;
3123
3124 if (!mls_enabled || !revocation_enabled)
3125 return (0);
3126
3127 subj = SLOT(active_cred->cr_label);
3128 obj = SLOT(vplabel);
3129
3130 if (!mls_dominate_effective(obj, subj))
3131 return (EACCES);
3132
3133 return (0);
3134 }
3135
3136 static int
mls_vnode_create_extattr(struct ucred * cred,struct mount * mp,struct label * mplabel,struct vnode * dvp,struct label * dvplabel,struct vnode * vp,struct label * vplabel,struct componentname * cnp)3137 mls_vnode_create_extattr(struct ucred *cred, struct mount *mp,
3138 struct label *mplabel, struct vnode *dvp, struct label *dvplabel,
3139 struct vnode *vp, struct label *vplabel, struct componentname *cnp)
3140 {
3141 struct mac_mls *source, *dest, mm_temp;
3142 size_t buflen;
3143 int error;
3144
3145 buflen = sizeof(mm_temp);
3146 bzero(&mm_temp, buflen);
3147
3148 source = SLOT(cred->cr_label);
3149 dest = SLOT(vplabel);
3150 mls_copy_effective(source, &mm_temp);
3151
3152 error = vn_extattr_set(vp, IO_NODELOCKED, MAC_MLS_EXTATTR_NAMESPACE,
3153 MAC_MLS_EXTATTR_NAME, buflen, (char *) &mm_temp, curthread);
3154 if (error == 0)
3155 mls_copy_effective(source, dest);
3156 return (error);
3157 }
3158
3159 static void
mls_vnode_relabel(struct ucred * cred,struct vnode * vp,struct label * vplabel,struct label * label)3160 mls_vnode_relabel(struct ucred *cred, struct vnode *vp,
3161 struct label *vplabel, struct label *label)
3162 {
3163 struct mac_mls *source, *dest;
3164
3165 source = SLOT(label);
3166 dest = SLOT(vplabel);
3167
3168 mls_copy(source, dest);
3169 }
3170
3171 static int
mls_vnode_setlabel_extattr(struct ucred * cred,struct vnode * vp,struct label * vplabel,struct label * intlabel)3172 mls_vnode_setlabel_extattr(struct ucred *cred, struct vnode *vp,
3173 struct label *vplabel, struct label *intlabel)
3174 {
3175 struct mac_mls *source, mm_temp;
3176 size_t buflen;
3177 int error;
3178
3179 buflen = sizeof(mm_temp);
3180 bzero(&mm_temp, buflen);
3181
3182 source = SLOT(intlabel);
3183 if ((source->mm_flags & MAC_MLS_FLAG_EFFECTIVE) == 0)
3184 return (0);
3185
3186 mls_copy_effective(source, &mm_temp);
3187
3188 error = vn_extattr_set(vp, IO_NODELOCKED, MAC_MLS_EXTATTR_NAMESPACE,
3189 MAC_MLS_EXTATTR_NAME, buflen, (char *) &mm_temp, curthread);
3190 return (error);
3191 }
3192
3193 static struct mac_policy_ops mls_ops =
3194 {
3195 .mpo_init = mls_init,
3196
3197 .mpo_bpfdesc_check_receive = mls_bpfdesc_check_receive,
3198 .mpo_bpfdesc_create = mls_bpfdesc_create,
3199 .mpo_bpfdesc_create_mbuf = mls_bpfdesc_create_mbuf,
3200 .mpo_bpfdesc_destroy_label = mls_destroy_label,
3201 .mpo_bpfdesc_init_label = mls_init_label,
3202
3203 .mpo_cred_associate_nfsd = mls_cred_associate_nfsd,
3204 .mpo_cred_check_relabel = mls_cred_check_relabel,
3205 .mpo_cred_check_visible = mls_cred_check_visible,
3206 .mpo_cred_copy_label = mls_copy_label,
3207 .mpo_cred_create_init = mls_cred_create_init,
3208 .mpo_cred_create_swapper = mls_cred_create_swapper,
3209 .mpo_cred_destroy_label = mls_destroy_label,
3210 .mpo_cred_externalize_label = mls_externalize_label,
3211 .mpo_cred_init_label = mls_init_label,
3212 .mpo_cred_internalize_label = mls_internalize_label,
3213 .mpo_cred_relabel = mls_cred_relabel,
3214
3215 .mpo_devfs_create_device = mls_devfs_create_device,
3216 .mpo_devfs_create_directory = mls_devfs_create_directory,
3217 .mpo_devfs_create_symlink = mls_devfs_create_symlink,
3218 .mpo_devfs_destroy_label = mls_destroy_label,
3219 .mpo_devfs_init_label = mls_init_label,
3220 .mpo_devfs_update = mls_devfs_update,
3221 .mpo_devfs_vnode_associate = mls_devfs_vnode_associate,
3222
3223 .mpo_ifnet_check_relabel = mls_ifnet_check_relabel,
3224 .mpo_ifnet_check_transmit = mls_ifnet_check_transmit,
3225 .mpo_ifnet_copy_label = mls_copy_label,
3226 .mpo_ifnet_create = mls_ifnet_create,
3227 .mpo_ifnet_create_mbuf = mls_ifnet_create_mbuf,
3228 .mpo_ifnet_destroy_label = mls_destroy_label,
3229 .mpo_ifnet_externalize_label = mls_externalize_label,
3230 .mpo_ifnet_init_label = mls_init_label,
3231 .mpo_ifnet_internalize_label = mls_internalize_label,
3232 .mpo_ifnet_relabel = mls_ifnet_relabel,
3233
3234 .mpo_inpcb_check_deliver = mls_inpcb_check_deliver,
3235 .mpo_inpcb_check_visible = mls_inpcb_check_visible,
3236 .mpo_inpcb_create = mls_inpcb_create,
3237 .mpo_inpcb_create_mbuf = mls_inpcb_create_mbuf,
3238 .mpo_inpcb_destroy_label = mls_destroy_label,
3239 .mpo_inpcb_init_label = mls_init_label_waitcheck,
3240 .mpo_inpcb_sosetlabel = mls_inpcb_sosetlabel,
3241
3242 .mpo_ip6q_create = mls_ip6q_create,
3243 .mpo_ip6q_destroy_label = mls_destroy_label,
3244 .mpo_ip6q_init_label = mls_init_label_waitcheck,
3245 .mpo_ip6q_match = mls_ip6q_match,
3246 .mpo_ip6q_reassemble = mls_ip6q_reassemble,
3247 .mpo_ip6q_update = mls_ip6q_update,
3248
3249 .mpo_ipq_create = mls_ipq_create,
3250 .mpo_ipq_destroy_label = mls_destroy_label,
3251 .mpo_ipq_init_label = mls_init_label_waitcheck,
3252 .mpo_ipq_match = mls_ipq_match,
3253 .mpo_ipq_reassemble = mls_ipq_reassemble,
3254 .mpo_ipq_update = mls_ipq_update,
3255
3256 .mpo_mbuf_copy_label = mls_copy_label,
3257 .mpo_mbuf_destroy_label = mls_destroy_label,
3258 .mpo_mbuf_init_label = mls_init_label_waitcheck,
3259
3260 .mpo_mount_check_stat = mls_mount_check_stat,
3261 .mpo_mount_create = mls_mount_create,
3262 .mpo_mount_destroy_label = mls_destroy_label,
3263 .mpo_mount_init_label = mls_init_label,
3264
3265 .mpo_netinet_arp_send = mls_netinet_arp_send,
3266 .mpo_netinet_firewall_reply = mls_netinet_firewall_reply,
3267 .mpo_netinet_firewall_send = mls_netinet_firewall_send,
3268 .mpo_netinet_fragment = mls_netinet_fragment,
3269 .mpo_netinet_icmp_reply = mls_netinet_icmp_reply,
3270 .mpo_netinet_igmp_send = mls_netinet_igmp_send,
3271
3272 .mpo_netinet6_nd6_send = mls_netinet6_nd6_send,
3273
3274 .mpo_pipe_check_ioctl = mls_pipe_check_ioctl,
3275 .mpo_pipe_check_poll = mls_pipe_check_poll,
3276 .mpo_pipe_check_read = mls_pipe_check_read,
3277 .mpo_pipe_check_relabel = mls_pipe_check_relabel,
3278 .mpo_pipe_check_stat = mls_pipe_check_stat,
3279 .mpo_pipe_check_write = mls_pipe_check_write,
3280 .mpo_pipe_copy_label = mls_copy_label,
3281 .mpo_pipe_create = mls_pipe_create,
3282 .mpo_pipe_destroy_label = mls_destroy_label,
3283 .mpo_pipe_externalize_label = mls_externalize_label,
3284 .mpo_pipe_init_label = mls_init_label,
3285 .mpo_pipe_internalize_label = mls_internalize_label,
3286 .mpo_pipe_relabel = mls_pipe_relabel,
3287
3288 .mpo_posixsem_check_getvalue = mls_posixsem_check_rdonly,
3289 .mpo_posixsem_check_open = mls_posixsem_check_openunlink,
3290 .mpo_posixsem_check_post = mls_posixsem_check_write,
3291 .mpo_posixsem_check_setmode = mls_posixsem_check_setmode,
3292 .mpo_posixsem_check_setowner = mls_posixsem_check_setowner,
3293 .mpo_posixsem_check_stat = mls_posixsem_check_rdonly,
3294 .mpo_posixsem_check_unlink = mls_posixsem_check_openunlink,
3295 .mpo_posixsem_check_wait = mls_posixsem_check_write,
3296 .mpo_posixsem_create = mls_posixsem_create,
3297 .mpo_posixsem_destroy_label = mls_destroy_label,
3298 .mpo_posixsem_init_label = mls_init_label,
3299
3300 .mpo_posixshm_check_mmap = mls_posixshm_check_mmap,
3301 .mpo_posixshm_check_open = mls_posixshm_check_open,
3302 .mpo_posixshm_check_read = mls_posixshm_check_read,
3303 .mpo_posixshm_check_setmode = mls_posixshm_check_setmode,
3304 .mpo_posixshm_check_setowner = mls_posixshm_check_setowner,
3305 .mpo_posixshm_check_stat = mls_posixshm_check_stat,
3306 .mpo_posixshm_check_truncate = mls_posixshm_check_truncate,
3307 .mpo_posixshm_check_unlink = mls_posixshm_check_unlink,
3308 .mpo_posixshm_check_write = mls_posixshm_check_write,
3309 .mpo_posixshm_create = mls_posixshm_create,
3310 .mpo_posixshm_destroy_label = mls_destroy_label,
3311 .mpo_posixshm_init_label = mls_init_label,
3312
3313 .mpo_proc_check_debug = mls_proc_check_debug,
3314 .mpo_proc_check_sched = mls_proc_check_sched,
3315 .mpo_proc_check_signal = mls_proc_check_signal,
3316
3317 .mpo_socket_check_deliver = mls_socket_check_deliver,
3318 .mpo_socket_check_relabel = mls_socket_check_relabel,
3319 .mpo_socket_check_visible = mls_socket_check_visible,
3320 .mpo_socket_copy_label = mls_copy_label,
3321 .mpo_socket_create = mls_socket_create,
3322 .mpo_socket_create_mbuf = mls_socket_create_mbuf,
3323 .mpo_socket_destroy_label = mls_destroy_label,
3324 .mpo_socket_externalize_label = mls_externalize_label,
3325 .mpo_socket_init_label = mls_init_label_waitcheck,
3326 .mpo_socket_internalize_label = mls_internalize_label,
3327 .mpo_socket_newconn = mls_socket_newconn,
3328 .mpo_socket_relabel = mls_socket_relabel,
3329
3330 .mpo_socketpeer_destroy_label = mls_destroy_label,
3331 .mpo_socketpeer_externalize_label = mls_externalize_label,
3332 .mpo_socketpeer_init_label = mls_init_label_waitcheck,
3333 .mpo_socketpeer_set_from_mbuf = mls_socketpeer_set_from_mbuf,
3334 .mpo_socketpeer_set_from_socket = mls_socketpeer_set_from_socket,
3335
3336 .mpo_syncache_create = mls_syncache_create,
3337 .mpo_syncache_create_mbuf = mls_syncache_create_mbuf,
3338 .mpo_syncache_destroy_label = mls_destroy_label,
3339 .mpo_syncache_init_label = mls_init_label_waitcheck,
3340
3341 .mpo_sysvmsg_cleanup = mls_sysvmsg_cleanup,
3342 .mpo_sysvmsg_create = mls_sysvmsg_create,
3343 .mpo_sysvmsg_destroy_label = mls_destroy_label,
3344 .mpo_sysvmsg_init_label = mls_init_label,
3345
3346 .mpo_sysvmsq_check_msgrcv = mls_sysvmsq_check_msgrcv,
3347 .mpo_sysvmsq_check_msgrmid = mls_sysvmsq_check_msgrmid,
3348 .mpo_sysvmsq_check_msqget = mls_sysvmsq_check_msqget,
3349 .mpo_sysvmsq_check_msqsnd = mls_sysvmsq_check_msqsnd,
3350 .mpo_sysvmsq_check_msqrcv = mls_sysvmsq_check_msqrcv,
3351 .mpo_sysvmsq_check_msqctl = mls_sysvmsq_check_msqctl,
3352 .mpo_sysvmsq_cleanup = mls_sysvmsq_cleanup,
3353 .mpo_sysvmsq_destroy_label = mls_destroy_label,
3354 .mpo_sysvmsq_init_label = mls_init_label,
3355 .mpo_sysvmsq_create = mls_sysvmsq_create,
3356
3357 .mpo_sysvsem_check_semctl = mls_sysvsem_check_semctl,
3358 .mpo_sysvsem_check_semget = mls_sysvsem_check_semget,
3359 .mpo_sysvsem_check_semop = mls_sysvsem_check_semop,
3360 .mpo_sysvsem_cleanup = mls_sysvsem_cleanup,
3361 .mpo_sysvsem_create = mls_sysvsem_create,
3362 .mpo_sysvsem_destroy_label = mls_destroy_label,
3363 .mpo_sysvsem_init_label = mls_init_label,
3364
3365 .mpo_sysvshm_check_shmat = mls_sysvshm_check_shmat,
3366 .mpo_sysvshm_check_shmctl = mls_sysvshm_check_shmctl,
3367 .mpo_sysvshm_check_shmget = mls_sysvshm_check_shmget,
3368 .mpo_sysvshm_cleanup = mls_sysvshm_cleanup,
3369 .mpo_sysvshm_create = mls_sysvshm_create,
3370 .mpo_sysvshm_destroy_label = mls_destroy_label,
3371 .mpo_sysvshm_init_label = mls_init_label,
3372
3373 .mpo_system_check_acct = mls_system_check_acct,
3374 .mpo_system_check_auditctl = mls_system_check_auditctl,
3375 .mpo_system_check_swapon = mls_system_check_swapon,
3376
3377 .mpo_vnode_associate_extattr = mls_vnode_associate_extattr,
3378 .mpo_vnode_associate_singlelabel = mls_vnode_associate_singlelabel,
3379 .mpo_vnode_check_access = mls_vnode_check_open,
3380 .mpo_vnode_check_chdir = mls_vnode_check_chdir,
3381 .mpo_vnode_check_chroot = mls_vnode_check_chroot,
3382 .mpo_vnode_check_create = mls_vnode_check_create,
3383 .mpo_vnode_check_deleteacl = mls_vnode_check_deleteacl,
3384 .mpo_vnode_check_deleteextattr = mls_vnode_check_deleteextattr,
3385 .mpo_vnode_check_exec = mls_vnode_check_exec,
3386 .mpo_vnode_check_getacl = mls_vnode_check_getacl,
3387 .mpo_vnode_check_getextattr = mls_vnode_check_getextattr,
3388 .mpo_vnode_check_link = mls_vnode_check_link,
3389 .mpo_vnode_check_listextattr = mls_vnode_check_listextattr,
3390 .mpo_vnode_check_lookup = mls_vnode_check_lookup,
3391 .mpo_vnode_check_mmap = mls_vnode_check_mmap,
3392 .mpo_vnode_check_open = mls_vnode_check_open,
3393 .mpo_vnode_check_poll = mls_vnode_check_poll,
3394 .mpo_vnode_check_read = mls_vnode_check_read,
3395 .mpo_vnode_check_readdir = mls_vnode_check_readdir,
3396 .mpo_vnode_check_readlink = mls_vnode_check_readlink,
3397 .mpo_vnode_check_relabel = mls_vnode_check_relabel,
3398 .mpo_vnode_check_rename_from = mls_vnode_check_rename_from,
3399 .mpo_vnode_check_rename_to = mls_vnode_check_rename_to,
3400 .mpo_vnode_check_revoke = mls_vnode_check_revoke,
3401 .mpo_vnode_check_setacl = mls_vnode_check_setacl,
3402 .mpo_vnode_check_setextattr = mls_vnode_check_setextattr,
3403 .mpo_vnode_check_setflags = mls_vnode_check_setflags,
3404 .mpo_vnode_check_setmode = mls_vnode_check_setmode,
3405 .mpo_vnode_check_setowner = mls_vnode_check_setowner,
3406 .mpo_vnode_check_setutimes = mls_vnode_check_setutimes,
3407 .mpo_vnode_check_stat = mls_vnode_check_stat,
3408 .mpo_vnode_check_unlink = mls_vnode_check_unlink,
3409 .mpo_vnode_check_write = mls_vnode_check_write,
3410 .mpo_vnode_copy_label = mls_copy_label,
3411 .mpo_vnode_create_extattr = mls_vnode_create_extattr,
3412 .mpo_vnode_destroy_label = mls_destroy_label,
3413 .mpo_vnode_externalize_label = mls_externalize_label,
3414 .mpo_vnode_init_label = mls_init_label,
3415 .mpo_vnode_internalize_label = mls_internalize_label,
3416 .mpo_vnode_relabel = mls_vnode_relabel,
3417 .mpo_vnode_setlabel_extattr = mls_vnode_setlabel_extattr,
3418 };
3419
3420 MAC_POLICY_SET(&mls_ops, mac_mls, "TrustedBSD MAC/MLS",
3421 MPC_LOADTIME_FLAG_NOTLATE, &mls_slot);
3422