1/*-
| 1/*-
|
2 * Copyright (c) 1999-2002, 2007-2009 Robert N. M. Watson
| 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 *
| 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 *
|
17 * Redistribution and use in source and binary forms, with or without
18 * modification, are permitted provided that the following conditions
19 * are met:
20 * 1. Redistributions of source code must retain the above copyright
21 * notice, this list of conditions and the following disclaimer.
22 * 2. Redistributions in binary form must reproduce the above copyright
23 * notice, this list of conditions and the following disclaimer in the
24 * documentation and/or other materials provided with the distribution.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 *
| 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 *
|
38 * $FreeBSD: head/sys/security/mac_biba/mac_biba.c 204581 2010-03-02 15:05:48Z rwatson $
| 41 * $FreeBSD: head/sys/security/mac_biba/mac_biba.c 225344 2011-09-02 17:40:39Z rwatson $
|
39 */
40
41/*
42 * Developed by the TrustedBSD Project.
43 *
44 * Biba fixed label mandatory integrity policy.
45 */
46
47#include <sys/param.h>
48#include <sys/conf.h>
49#include <sys/extattr.h>
50#include <sys/kernel.h>
51#include <sys/ksem.h>
52#include <sys/malloc.h>
53#include <sys/mman.h>
54#include <sys/mount.h>
55#include <sys/priv.h>
56#include <sys/proc.h>
57#include <sys/sbuf.h>
58#include <sys/systm.h>
59#include <sys/sysproto.h>
60#include <sys/sysent.h>
61#include <sys/systm.h>
62#include <sys/vnode.h>
63#include <sys/file.h>
64#include <sys/socket.h>
65#include <sys/socketvar.h>
66#include <sys/pipe.h>
67#include <sys/sx.h>
68#include <sys/sysctl.h>
69#include <sys/msg.h>
70#include <sys/sem.h>
71#include <sys/shm.h>
72
73#include <fs/devfs/devfs.h>
74
75#include <net/bpfdesc.h>
76#include <net/if.h>
77#include <net/if_types.h>
78#include <net/if_var.h>
79
80#include <netinet/in.h>
81#include <netinet/in_pcb.h>
82#include <netinet/ip_var.h>
83
84#include <vm/uma.h>
85#include <vm/vm.h>
86
87#include <security/mac/mac_policy.h>
88#include <security/mac_biba/mac_biba.h>
89
90SYSCTL_DECL(_security_mac);
91
92SYSCTL_NODE(_security_mac, OID_AUTO, biba, CTLFLAG_RW, 0,
93 "TrustedBSD mac_biba policy controls");
94
95static int biba_label_size = sizeof(struct mac_biba);
96SYSCTL_INT(_security_mac_biba, OID_AUTO, label_size, CTLFLAG_RD,
97 &biba_label_size, 0, "Size of struct mac_biba");
98
99static int biba_enabled = 1;
100SYSCTL_INT(_security_mac_biba, OID_AUTO, enabled, CTLFLAG_RW, &biba_enabled,
101 0, "Enforce MAC/Biba policy");
102TUNABLE_INT("security.mac.biba.enabled", &biba_enabled);
103
104static int destroyed_not_inited;
105SYSCTL_INT(_security_mac_biba, OID_AUTO, destroyed_not_inited, CTLFLAG_RD,
106 &destroyed_not_inited, 0, "Count of labels destroyed but not inited");
107
108static int trust_all_interfaces = 0;
109SYSCTL_INT(_security_mac_biba, OID_AUTO, trust_all_interfaces, CTLFLAG_RD,
110 &trust_all_interfaces, 0, "Consider all interfaces 'trusted' by MAC/Biba");
111TUNABLE_INT("security.mac.biba.trust_all_interfaces", &trust_all_interfaces);
112
113static char trusted_interfaces[128];
114SYSCTL_STRING(_security_mac_biba, OID_AUTO, trusted_interfaces, CTLFLAG_RD,
115 trusted_interfaces, 0, "Interfaces considered 'trusted' by MAC/Biba");
116TUNABLE_STR("security.mac.biba.trusted_interfaces", trusted_interfaces,
117 sizeof(trusted_interfaces));
118
119static int max_compartments = MAC_BIBA_MAX_COMPARTMENTS;
120SYSCTL_INT(_security_mac_biba, OID_AUTO, max_compartments, CTLFLAG_RD,
121 &max_compartments, 0, "Maximum supported compartments");
122
123static int ptys_equal = 0;
124SYSCTL_INT(_security_mac_biba, OID_AUTO, ptys_equal, CTLFLAG_RW, &ptys_equal,
125 0, "Label pty devices as biba/equal on create");
126TUNABLE_INT("security.mac.biba.ptys_equal", &ptys_equal);
127
128static int interfaces_equal = 1;
129SYSCTL_INT(_security_mac_biba, OID_AUTO, interfaces_equal, CTLFLAG_RW,
130 &interfaces_equal, 0, "Label network interfaces as biba/equal on create");
131TUNABLE_INT("security.mac.biba.interfaces_equal", &interfaces_equal);
132
133static int revocation_enabled = 0;
134SYSCTL_INT(_security_mac_biba, OID_AUTO, revocation_enabled, CTLFLAG_RW,
135 &revocation_enabled, 0, "Revoke access to objects on relabel");
136TUNABLE_INT("security.mac.biba.revocation_enabled", &revocation_enabled);
137
138static int biba_slot;
139#define SLOT(l) ((struct mac_biba *)mac_label_get((l), biba_slot))
140#define SLOT_SET(l, val) mac_label_set((l), biba_slot, (uintptr_t)(val))
141
142static uma_zone_t zone_biba;
143
144static __inline int
145biba_bit_set_empty(u_char *set) {
146 int i;
147
148 for (i = 0; i < MAC_BIBA_MAX_COMPARTMENTS >> 3; i++)
149 if (set[i] != 0)
150 return (0);
151 return (1);
152}
153
154static struct mac_biba *
155biba_alloc(int flag)
156{
157
158 return (uma_zalloc(zone_biba, flag | M_ZERO));
159}
160
161static void
162biba_free(struct mac_biba *mb)
163{
164
165 if (mb != NULL)
166 uma_zfree(zone_biba, mb);
167 else
168 atomic_add_int(&destroyed_not_inited, 1);
169}
170
171static int
172biba_atmostflags(struct mac_biba *mb, int flags)
173{
174
175 if ((mb->mb_flags & flags) != mb->mb_flags)
176 return (EINVAL);
177 return (0);
178}
179
180static int
181biba_dominate_element(struct mac_biba_element *a, struct mac_biba_element *b)
182{
183 int bit;
184
185 switch (a->mbe_type) {
186 case MAC_BIBA_TYPE_EQUAL:
187 case MAC_BIBA_TYPE_HIGH:
188 return (1);
189
190 case MAC_BIBA_TYPE_LOW:
191 switch (b->mbe_type) {
192 case MAC_BIBA_TYPE_GRADE:
193 case MAC_BIBA_TYPE_HIGH:
194 return (0);
195
196 case MAC_BIBA_TYPE_EQUAL:
197 case MAC_BIBA_TYPE_LOW:
198 return (1);
199
200 default:
201 panic("biba_dominate_element: b->mbe_type invalid");
202 }
203
204 case MAC_BIBA_TYPE_GRADE:
205 switch (b->mbe_type) {
206 case MAC_BIBA_TYPE_EQUAL:
207 case MAC_BIBA_TYPE_LOW:
208 return (1);
209
210 case MAC_BIBA_TYPE_HIGH:
211 return (0);
212
213 case MAC_BIBA_TYPE_GRADE:
214 for (bit = 1; bit <= MAC_BIBA_MAX_COMPARTMENTS; bit++)
215 if (!MAC_BIBA_BIT_TEST(bit,
216 a->mbe_compartments) &&
217 MAC_BIBA_BIT_TEST(bit, b->mbe_compartments))
218 return (0);
219 return (a->mbe_grade >= b->mbe_grade);
220
221 default:
222 panic("biba_dominate_element: b->mbe_type invalid");
223 }
224
225 default:
226 panic("biba_dominate_element: a->mbe_type invalid");
227 }
228
229 return (0);
230}
231
232static int
233biba_subject_dominate_high(struct mac_biba *mb)
234{
235 struct mac_biba_element *element;
236
237 KASSERT((mb->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0,
238 ("biba_effective_in_range: mb not effective"));
239 element = &mb->mb_effective;
240
241 return (element->mbe_type == MAC_BIBA_TYPE_EQUAL ||
242 element->mbe_type == MAC_BIBA_TYPE_HIGH);
243}
244
245static int
246biba_range_in_range(struct mac_biba *rangea, struct mac_biba *rangeb)
247{
248
249 return (biba_dominate_element(&rangeb->mb_rangehigh,
250 &rangea->mb_rangehigh) &&
251 biba_dominate_element(&rangea->mb_rangelow,
252 &rangeb->mb_rangelow));
253}
254
255static int
256biba_effective_in_range(struct mac_biba *effective, struct mac_biba *range)
257{
258
259 KASSERT((effective->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0,
260 ("biba_effective_in_range: a not effective"));
261 KASSERT((range->mb_flags & MAC_BIBA_FLAG_RANGE) != 0,
262 ("biba_effective_in_range: b not range"));
263
264 return (biba_dominate_element(&range->mb_rangehigh,
265 &effective->mb_effective) &&
266 biba_dominate_element(&effective->mb_effective,
267 &range->mb_rangelow));
268
269 return (1);
270}
271
272static int
273biba_dominate_effective(struct mac_biba *a, struct mac_biba *b)
274{
275 KASSERT((a->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0,
276 ("biba_dominate_effective: a not effective"));
277 KASSERT((b->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0,
278 ("biba_dominate_effective: b not effective"));
279
280 return (biba_dominate_element(&a->mb_effective, &b->mb_effective));
281}
282
283static int
284biba_equal_element(struct mac_biba_element *a, struct mac_biba_element *b)
285{
286
287 if (a->mbe_type == MAC_BIBA_TYPE_EQUAL ||
288 b->mbe_type == MAC_BIBA_TYPE_EQUAL)
289 return (1);
290
291 return (a->mbe_type == b->mbe_type && a->mbe_grade == b->mbe_grade);
292}
293
294static int
295biba_equal_effective(struct mac_biba *a, struct mac_biba *b)
296{
297
298 KASSERT((a->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0,
299 ("biba_equal_effective: a not effective"));
300 KASSERT((b->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0,
301 ("biba_equal_effective: b not effective"));
302
303 return (biba_equal_element(&a->mb_effective, &b->mb_effective));
304}
305
306static int
307biba_contains_equal(struct mac_biba *mb)
308{
309
310 if (mb->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) {
311 if (mb->mb_effective.mbe_type == MAC_BIBA_TYPE_EQUAL)
312 return (1);
313 }
314
315 if (mb->mb_flags & MAC_BIBA_FLAG_RANGE) {
316 if (mb->mb_rangelow.mbe_type == MAC_BIBA_TYPE_EQUAL)
317 return (1);
318 if (mb->mb_rangehigh.mbe_type == MAC_BIBA_TYPE_EQUAL)
319 return (1);
320 }
321
322 return (0);
323}
324
325static int
326biba_subject_privileged(struct mac_biba *mb)
327{
328
329 KASSERT((mb->mb_flags & MAC_BIBA_FLAGS_BOTH) == MAC_BIBA_FLAGS_BOTH,
330 ("biba_subject_privileged: subject doesn't have both labels"));
331
332 /* If the effective is EQUAL, it's ok. */
333 if (mb->mb_effective.mbe_type == MAC_BIBA_TYPE_EQUAL)
334 return (0);
335
336 /* If either range endpoint is EQUAL, it's ok. */
337 if (mb->mb_rangelow.mbe_type == MAC_BIBA_TYPE_EQUAL ||
338 mb->mb_rangehigh.mbe_type == MAC_BIBA_TYPE_EQUAL)
339 return (0);
340
341 /* If the range is low-high, it's ok. */
342 if (mb->mb_rangelow.mbe_type == MAC_BIBA_TYPE_LOW &&
343 mb->mb_rangehigh.mbe_type == MAC_BIBA_TYPE_HIGH)
344 return (0);
345
346 /* It's not ok. */
347 return (EPERM);
348}
349
350static int
351biba_high_effective(struct mac_biba *mb)
352{
353
354 KASSERT((mb->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0,
355 ("biba_equal_effective: mb not effective"));
356
357 return (mb->mb_effective.mbe_type == MAC_BIBA_TYPE_HIGH);
358}
359
360static int
361biba_valid(struct mac_biba *mb)
362{
363
364 if (mb->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) {
365 switch (mb->mb_effective.mbe_type) {
366 case MAC_BIBA_TYPE_GRADE:
367 break;
368
369 case MAC_BIBA_TYPE_EQUAL:
370 case MAC_BIBA_TYPE_HIGH:
371 case MAC_BIBA_TYPE_LOW:
372 if (mb->mb_effective.mbe_grade != 0 ||
373 !MAC_BIBA_BIT_SET_EMPTY(
374 mb->mb_effective.mbe_compartments))
375 return (EINVAL);
376 break;
377
378 default:
379 return (EINVAL);
380 }
381 } else {
382 if (mb->mb_effective.mbe_type != MAC_BIBA_TYPE_UNDEF)
383 return (EINVAL);
384 }
385
386 if (mb->mb_flags & MAC_BIBA_FLAG_RANGE) {
387 switch (mb->mb_rangelow.mbe_type) {
388 case MAC_BIBA_TYPE_GRADE:
389 break;
390
391 case MAC_BIBA_TYPE_EQUAL:
392 case MAC_BIBA_TYPE_HIGH:
393 case MAC_BIBA_TYPE_LOW:
394 if (mb->mb_rangelow.mbe_grade != 0 ||
395 !MAC_BIBA_BIT_SET_EMPTY(
396 mb->mb_rangelow.mbe_compartments))
397 return (EINVAL);
398 break;
399
400 default:
401 return (EINVAL);
402 }
403
404 switch (mb->mb_rangehigh.mbe_type) {
405 case MAC_BIBA_TYPE_GRADE:
406 break;
407
408 case MAC_BIBA_TYPE_EQUAL:
409 case MAC_BIBA_TYPE_HIGH:
410 case MAC_BIBA_TYPE_LOW:
411 if (mb->mb_rangehigh.mbe_grade != 0 ||
412 !MAC_BIBA_BIT_SET_EMPTY(
413 mb->mb_rangehigh.mbe_compartments))
414 return (EINVAL);
415 break;
416
417 default:
418 return (EINVAL);
419 }
420 if (!biba_dominate_element(&mb->mb_rangehigh,
421 &mb->mb_rangelow))
422 return (EINVAL);
423 } else {
424 if (mb->mb_rangelow.mbe_type != MAC_BIBA_TYPE_UNDEF ||
425 mb->mb_rangehigh.mbe_type != MAC_BIBA_TYPE_UNDEF)
426 return (EINVAL);
427 }
428
429 return (0);
430}
431
432static void
433biba_set_range(struct mac_biba *mb, u_short typelow, u_short gradelow,
434 u_char *compartmentslow, u_short typehigh, u_short gradehigh,
435 u_char *compartmentshigh)
436{
437
438 mb->mb_rangelow.mbe_type = typelow;
439 mb->mb_rangelow.mbe_grade = gradelow;
440 if (compartmentslow != NULL)
441 memcpy(mb->mb_rangelow.mbe_compartments, compartmentslow,
442 sizeof(mb->mb_rangelow.mbe_compartments));
443 mb->mb_rangehigh.mbe_type = typehigh;
444 mb->mb_rangehigh.mbe_grade = gradehigh;
445 if (compartmentshigh != NULL)
446 memcpy(mb->mb_rangehigh.mbe_compartments, compartmentshigh,
447 sizeof(mb->mb_rangehigh.mbe_compartments));
448 mb->mb_flags |= MAC_BIBA_FLAG_RANGE;
449}
450
451static void
452biba_set_effective(struct mac_biba *mb, u_short type, u_short grade,
453 u_char *compartments)
454{
455
456 mb->mb_effective.mbe_type = type;
457 mb->mb_effective.mbe_grade = grade;
458 if (compartments != NULL)
459 memcpy(mb->mb_effective.mbe_compartments, compartments,
460 sizeof(mb->mb_effective.mbe_compartments));
461 mb->mb_flags |= MAC_BIBA_FLAG_EFFECTIVE;
462}
463
464static void
465biba_copy_range(struct mac_biba *labelfrom, struct mac_biba *labelto)
466{
467
468 KASSERT((labelfrom->mb_flags & MAC_BIBA_FLAG_RANGE) != 0,
469 ("biba_copy_range: labelfrom not range"));
470
471 labelto->mb_rangelow = labelfrom->mb_rangelow;
472 labelto->mb_rangehigh = labelfrom->mb_rangehigh;
473 labelto->mb_flags |= MAC_BIBA_FLAG_RANGE;
474}
475
476static void
477biba_copy_effective(struct mac_biba *labelfrom, struct mac_biba *labelto)
478{
479
480 KASSERT((labelfrom->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0,
481 ("biba_copy_effective: labelfrom not effective"));
482
483 labelto->mb_effective = labelfrom->mb_effective;
484 labelto->mb_flags |= MAC_BIBA_FLAG_EFFECTIVE;
485}
486
487static void
488biba_copy(struct mac_biba *source, struct mac_biba *dest)
489{
490
491 if (source->mb_flags & MAC_BIBA_FLAG_EFFECTIVE)
492 biba_copy_effective(source, dest);
493 if (source->mb_flags & MAC_BIBA_FLAG_RANGE)
494 biba_copy_range(source, dest);
495}
496
497/*
498 * Policy module operations.
499 */
500static void
501biba_init(struct mac_policy_conf *conf)
502{
503
504 zone_biba = uma_zcreate("mac_biba", sizeof(struct mac_biba), NULL,
505 NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
506}
507
508/*
509 * Label operations.
510 */
511static void
512biba_init_label(struct label *label)
513{
514
515 SLOT_SET(label, biba_alloc(M_WAITOK));
516}
517
518static int
519biba_init_label_waitcheck(struct label *label, int flag)
520{
521
522 SLOT_SET(label, biba_alloc(flag));
523 if (SLOT(label) == NULL)
524 return (ENOMEM);
525
526 return (0);
527}
528
529static void
530biba_destroy_label(struct label *label)
531{
532
533 biba_free(SLOT(label));
534 SLOT_SET(label, NULL);
535}
536
537/*
538 * biba_element_to_string() accepts an sbuf and Biba element. It converts
539 * the Biba element to a string and stores the result in the sbuf; if there
540 * isn't space in the sbuf, -1 is returned.
541 */
542static int
543biba_element_to_string(struct sbuf *sb, struct mac_biba_element *element)
544{
545 int i, first;
546
547 switch (element->mbe_type) {
548 case MAC_BIBA_TYPE_HIGH:
549 return (sbuf_printf(sb, "high"));
550
551 case MAC_BIBA_TYPE_LOW:
552 return (sbuf_printf(sb, "low"));
553
554 case MAC_BIBA_TYPE_EQUAL:
555 return (sbuf_printf(sb, "equal"));
556
557 case MAC_BIBA_TYPE_GRADE:
558 if (sbuf_printf(sb, "%d", element->mbe_grade) == -1)
559 return (-1);
560
561 first = 1;
562 for (i = 1; i <= MAC_BIBA_MAX_COMPARTMENTS; i++) {
563 if (MAC_BIBA_BIT_TEST(i, element->mbe_compartments)) {
564 if (first) {
565 if (sbuf_putc(sb, ':') == -1)
566 return (-1);
567 if (sbuf_printf(sb, "%d", i) == -1)
568 return (-1);
569 first = 0;
570 } else {
571 if (sbuf_printf(sb, "+%d", i) == -1)
572 return (-1);
573 }
574 }
575 }
576 return (0);
577
578 default:
579 panic("biba_element_to_string: invalid type (%d)",
580 element->mbe_type);
581 }
582}
583
584/*
585 * biba_to_string() converts a Biba label to a string, and places the results
586 * in the passed sbuf. It returns 0 on success, or EINVAL if there isn't
587 * room in the sbuf. Note: the sbuf will be modified even in a failure case,
588 * so the caller may need to revert the sbuf by restoring the offset if
589 * that's undesired.
590 */
591static int
592biba_to_string(struct sbuf *sb, struct mac_biba *mb)
593{
594
595 if (mb->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) {
596 if (biba_element_to_string(sb, &mb->mb_effective) == -1)
597 return (EINVAL);
598 }
599
600 if (mb->mb_flags & MAC_BIBA_FLAG_RANGE) {
601 if (sbuf_putc(sb, '(') == -1)
602 return (EINVAL);
603
604 if (biba_element_to_string(sb, &mb->mb_rangelow) == -1)
605 return (EINVAL);
606
607 if (sbuf_putc(sb, '-') == -1)
608 return (EINVAL);
609
610 if (biba_element_to_string(sb, &mb->mb_rangehigh) == -1)
611 return (EINVAL);
612
613 if (sbuf_putc(sb, ')') == -1)
614 return (EINVAL);
615 }
616
617 return (0);
618}
619
620static int
621biba_externalize_label(struct label *label, char *element_name,
622 struct sbuf *sb, int *claimed)
623{
624 struct mac_biba *mb;
625
626 if (strcmp(MAC_BIBA_LABEL_NAME, element_name) != 0)
627 return (0);
628
629 (*claimed)++;
630
631 mb = SLOT(label);
632 return (biba_to_string(sb, mb));
633}
634
635static int
636biba_parse_element(struct mac_biba_element *element, char *string)
637{
638 char *compartment, *end, *grade;
639 int value;
640
641 if (strcmp(string, "high") == 0 || strcmp(string, "hi") == 0) {
642 element->mbe_type = MAC_BIBA_TYPE_HIGH;
643 element->mbe_grade = MAC_BIBA_TYPE_UNDEF;
644 } else if (strcmp(string, "low") == 0 || strcmp(string, "lo") == 0) {
645 element->mbe_type = MAC_BIBA_TYPE_LOW;
646 element->mbe_grade = MAC_BIBA_TYPE_UNDEF;
647 } else if (strcmp(string, "equal") == 0 ||
648 strcmp(string, "eq") == 0) {
649 element->mbe_type = MAC_BIBA_TYPE_EQUAL;
650 element->mbe_grade = MAC_BIBA_TYPE_UNDEF;
651 } else {
652 element->mbe_type = MAC_BIBA_TYPE_GRADE;
653
654 /*
655 * Numeric grade piece of the element.
656 */
657 grade = strsep(&string, ":");
658 value = strtol(grade, &end, 10);
659 if (end == grade || *end != '\0')
660 return (EINVAL);
661 if (value < 0 || value > 65535)
662 return (EINVAL);
663 element->mbe_grade = value;
664
665 /*
666 * Optional compartment piece of the element. If none are
667 * included, we assume that the label has no compartments.
668 */
669 if (string == NULL)
670 return (0);
671 if (*string == '\0')
672 return (0);
673
674 while ((compartment = strsep(&string, "+")) != NULL) {
675 value = strtol(compartment, &end, 10);
676 if (compartment == end || *end != '\0')
677 return (EINVAL);
678 if (value < 1 || value > MAC_BIBA_MAX_COMPARTMENTS)
679 return (EINVAL);
680 MAC_BIBA_BIT_SET(value, element->mbe_compartments);
681 }
682 }
683
684 return (0);
685}
686
687/*
688 * Note: destructively consumes the string, make a local copy before calling
689 * if that's a problem.
690 */
691static int
692biba_parse(struct mac_biba *mb, char *string)
693{
694 char *rangehigh, *rangelow, *effective;
695 int error;
696
697 effective = strsep(&string, "(");
698 if (*effective == '\0')
699 effective = NULL;
700
701 if (string != NULL) {
702 rangelow = strsep(&string, "-");
703 if (string == NULL)
704 return (EINVAL);
705 rangehigh = strsep(&string, ")");
706 if (string == NULL)
707 return (EINVAL);
708 if (*string != '\0')
709 return (EINVAL);
710 } else {
711 rangelow = NULL;
712 rangehigh = NULL;
713 }
714
715 KASSERT((rangelow != NULL && rangehigh != NULL) ||
716 (rangelow == NULL && rangehigh == NULL),
717 ("biba_parse: range mismatch"));
718
719 bzero(mb, sizeof(*mb));
720 if (effective != NULL) {
721 error = biba_parse_element(&mb->mb_effective, effective);
722 if (error)
723 return (error);
724 mb->mb_flags |= MAC_BIBA_FLAG_EFFECTIVE;
725 }
726
727 if (rangelow != NULL) {
728 error = biba_parse_element(&mb->mb_rangelow, rangelow);
729 if (error)
730 return (error);
731 error = biba_parse_element(&mb->mb_rangehigh, rangehigh);
732 if (error)
733 return (error);
734 mb->mb_flags |= MAC_BIBA_FLAG_RANGE;
735 }
736
737 error = biba_valid(mb);
738 if (error)
739 return (error);
740
741 return (0);
742}
743
744static int
745biba_internalize_label(struct label *label, char *element_name,
746 char *element_data, int *claimed)
747{
748 struct mac_biba *mb, mb_temp;
749 int error;
750
751 if (strcmp(MAC_BIBA_LABEL_NAME, element_name) != 0)
752 return (0);
753
754 (*claimed)++;
755
756 error = biba_parse(&mb_temp, element_data);
757 if (error)
758 return (error);
759
760 mb = SLOT(label);
761 *mb = mb_temp;
762
763 return (0);
764}
765
766static void
767biba_copy_label(struct label *src, struct label *dest)
768{
769
770 *SLOT(dest) = *SLOT(src);
771}
772
773/*
774 * Object-specific entry point implementations are sorted alphabetically by
775 * object type name and then by operation.
776 */
777static int
778biba_bpfdesc_check_receive(struct bpf_d *d, struct label *dlabel,
779 struct ifnet *ifp, struct label *ifplabel)
780{
781 struct mac_biba *a, *b;
782
783 if (!biba_enabled)
784 return (0);
785
786 a = SLOT(dlabel);
787 b = SLOT(ifplabel);
788
789 if (biba_equal_effective(a, b))
790 return (0);
791 return (EACCES);
792}
793
794static void
795biba_bpfdesc_create(struct ucred *cred, struct bpf_d *d,
796 struct label *dlabel)
797{
798 struct mac_biba *source, *dest;
799
800 source = SLOT(cred->cr_label);
801 dest = SLOT(dlabel);
802
803 biba_copy_effective(source, dest);
804}
805
806static void
807biba_bpfdesc_create_mbuf(struct bpf_d *d, struct label *dlabel,
808 struct mbuf *m, struct label *mlabel)
809{
810 struct mac_biba *source, *dest;
811
812 source = SLOT(dlabel);
813 dest = SLOT(mlabel);
814
815 biba_copy_effective(source, dest);
816}
817
818static void
819biba_cred_associate_nfsd(struct ucred *cred)
820{
821 struct mac_biba *label;
822
823 label = SLOT(cred->cr_label);
824 biba_set_effective(label, MAC_BIBA_TYPE_LOW, 0, NULL);
825 biba_set_range(label, MAC_BIBA_TYPE_LOW, 0, NULL, MAC_BIBA_TYPE_HIGH,
826 0, NULL);
827}
828
829static int
830biba_cred_check_relabel(struct ucred *cred, struct label *newlabel)
831{
832 struct mac_biba *subj, *new;
833 int error;
834
835 subj = SLOT(cred->cr_label);
836 new = SLOT(newlabel);
837
838 /*
839 * If there is a Biba label update for the credential, it may
840 * be an update of the effective, range, or both.
841 */
842 error = biba_atmostflags(new, MAC_BIBA_FLAGS_BOTH);
843 if (error)
844 return (error);
845
846 /*
847 * If the Biba label is to be changed, authorize as appropriate.
848 */
849 if (new->mb_flags & MAC_BIBA_FLAGS_BOTH) {
850 /*
851 * If the change request modifies both the Biba label
852 * effective and range, check that the new effective will be
853 * in the new range.
854 */
855 if ((new->mb_flags & MAC_BIBA_FLAGS_BOTH) ==
856 MAC_BIBA_FLAGS_BOTH &&
857 !biba_effective_in_range(new, new))
858 return (EINVAL);
859
860 /*
861 * To change the Biba effective label on a credential, the
862 * new effective label must be in the current range.
863 */
864 if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE &&
865 !biba_effective_in_range(new, subj))
866 return (EPERM);
867
868 /*
869 * To change the Biba range on a credential, the new range
870 * label must be in the current range.
871 */
872 if (new->mb_flags & MAC_BIBA_FLAG_RANGE &&
873 !biba_range_in_range(new, subj))
874 return (EPERM);
875
876 /*
877 * To have EQUAL in any component of the new credential Biba
878 * label, the subject must already have EQUAL in their label.
879 */
880 if (biba_contains_equal(new)) {
881 error = biba_subject_privileged(subj);
882 if (error)
883 return (error);
884 }
885 }
886
887 return (0);
888}
889
890static int
891biba_cred_check_visible(struct ucred *u1, struct ucred *u2)
892{
893 struct mac_biba *subj, *obj;
894
895 if (!biba_enabled)
896 return (0);
897
898 subj = SLOT(u1->cr_label);
899 obj = SLOT(u2->cr_label);
900
901 /* XXX: range */
902 if (!biba_dominate_effective(obj, subj))
903 return (ESRCH);
904
905 return (0);
906}
907
908static void
909biba_cred_create_init(struct ucred *cred)
910{
911 struct mac_biba *dest;
912
913 dest = SLOT(cred->cr_label);
914
915 biba_set_effective(dest, MAC_BIBA_TYPE_HIGH, 0, NULL);
916 biba_set_range(dest, MAC_BIBA_TYPE_LOW, 0, NULL, MAC_BIBA_TYPE_HIGH,
917 0, NULL);
918}
919
920static void
921biba_cred_create_swapper(struct ucred *cred)
922{
923 struct mac_biba *dest;
924
925 dest = SLOT(cred->cr_label);
926
927 biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL);
928 biba_set_range(dest, MAC_BIBA_TYPE_LOW, 0, NULL, MAC_BIBA_TYPE_HIGH,
929 0, NULL);
930}
931
932static void
933biba_cred_relabel(struct ucred *cred, struct label *newlabel)
934{
935 struct mac_biba *source, *dest;
936
937 source = SLOT(newlabel);
938 dest = SLOT(cred->cr_label);
939
940 biba_copy(source, dest);
941}
942
943static void
944biba_devfs_create_device(struct ucred *cred, struct mount *mp,
945 struct cdev *dev, struct devfs_dirent *de, struct label *delabel)
946{
947 struct mac_biba *mb;
948 int biba_type;
949
950 mb = SLOT(delabel);
951 if (strcmp(dev->si_name, "null") == 0 ||
952 strcmp(dev->si_name, "zero") == 0 ||
953 strcmp(dev->si_name, "random") == 0 ||
954 strncmp(dev->si_name, "fd/", strlen("fd/")) == 0)
955 biba_type = MAC_BIBA_TYPE_EQUAL;
956 else if (ptys_equal &&
957 (strncmp(dev->si_name, "ttyp", strlen("ttyp")) == 0 ||
958 strncmp(dev->si_name, "pts/", strlen("pts/")) == 0 ||
959 strncmp(dev->si_name, "ptyp", strlen("ptyp")) == 0))
960 biba_type = MAC_BIBA_TYPE_EQUAL;
961 else
962 biba_type = MAC_BIBA_TYPE_HIGH;
963 biba_set_effective(mb, biba_type, 0, NULL);
964}
965
966static void
967biba_devfs_create_directory(struct mount *mp, char *dirname, int dirnamelen,
968 struct devfs_dirent *de, struct label *delabel)
969{
970 struct mac_biba *mb;
971
972 mb = SLOT(delabel);
973
974 biba_set_effective(mb, MAC_BIBA_TYPE_HIGH, 0, NULL);
975}
976
977static void
978biba_devfs_create_symlink(struct ucred *cred, struct mount *mp,
979 struct devfs_dirent *dd, struct label *ddlabel, struct devfs_dirent *de,
980 struct label *delabel)
981{
982 struct mac_biba *source, *dest;
983
984 source = SLOT(cred->cr_label);
985 dest = SLOT(delabel);
986
987 biba_copy_effective(source, dest);
988}
989
990static void
991biba_devfs_update(struct mount *mp, struct devfs_dirent *de,
992 struct label *delabel, struct vnode *vp, struct label *vplabel)
993{
994 struct mac_biba *source, *dest;
995
996 source = SLOT(vplabel);
997 dest = SLOT(delabel);
998
999 biba_copy(source, dest);
1000}
1001
1002static void
1003biba_devfs_vnode_associate(struct mount *mp, struct label *mntlabel,
1004 struct devfs_dirent *de, struct label *delabel, struct vnode *vp,
1005 struct label *vplabel)
1006{
1007 struct mac_biba *source, *dest;
1008
1009 source = SLOT(delabel);
1010 dest = SLOT(vplabel);
1011
1012 biba_copy_effective(source, dest);
1013}
1014
1015static int
1016biba_ifnet_check_relabel(struct ucred *cred, struct ifnet *ifp,
1017 struct label *ifplabel, struct label *newlabel)
1018{
1019 struct mac_biba *subj, *new;
1020 int error;
1021
1022 subj = SLOT(cred->cr_label);
1023 new = SLOT(newlabel);
1024
1025 /*
1026 * If there is a Biba label update for the interface, it may be an
1027 * update of the effective, range, or both.
1028 */
1029 error = biba_atmostflags(new, MAC_BIBA_FLAGS_BOTH);
1030 if (error)
1031 return (error);
1032
1033 /*
1034 * Relabling network interfaces requires Biba privilege.
1035 */
1036 error = biba_subject_privileged(subj);
1037 if (error)
1038 return (error);
1039
1040 return (0);
1041}
1042
1043static int
1044biba_ifnet_check_transmit(struct ifnet *ifp, struct label *ifplabel,
1045 struct mbuf *m, struct label *mlabel)
1046{
1047 struct mac_biba *p, *i;
1048
1049 if (!biba_enabled)
1050 return (0);
1051
1052 p = SLOT(mlabel);
1053 i = SLOT(ifplabel);
1054
1055 return (biba_effective_in_range(p, i) ? 0 : EACCES);
1056}
1057
1058static void
1059biba_ifnet_create(struct ifnet *ifp, struct label *ifplabel)
1060{
1061 char tifname[IFNAMSIZ], *p, *q;
1062 char tiflist[sizeof(trusted_interfaces)];
1063 struct mac_biba *dest;
1064 int len, type;
1065
1066 dest = SLOT(ifplabel);
1067
1068 if (ifp->if_type == IFT_LOOP || interfaces_equal != 0) {
1069 type = MAC_BIBA_TYPE_EQUAL;
1070 goto set;
1071 }
1072
1073 if (trust_all_interfaces) {
1074 type = MAC_BIBA_TYPE_HIGH;
1075 goto set;
1076 }
1077
1078 type = MAC_BIBA_TYPE_LOW;
1079
1080 if (trusted_interfaces[0] == '\0' ||
1081 !strvalid(trusted_interfaces, sizeof(trusted_interfaces)))
1082 goto set;
1083
1084 bzero(tiflist, sizeof(tiflist));
1085 for (p = trusted_interfaces, q = tiflist; *p != '\0'; p++, q++)
1086 if(*p != ' ' && *p != '\t')
1087 *q = *p;
1088
1089 for (p = q = tiflist;; p++) {
1090 if (*p == ',' || *p == '\0') {
1091 len = p - q;
1092 if (len < IFNAMSIZ) {
1093 bzero(tifname, sizeof(tifname));
1094 bcopy(q, tifname, len);
1095 if (strcmp(tifname, ifp->if_xname) == 0) {
1096 type = MAC_BIBA_TYPE_HIGH;
1097 break;
1098 }
1099 } else {
1100 *p = '\0';
1101 printf("mac_biba warning: interface name "
1102 "\"%s\" is too long (must be < %d)\n",
1103 q, IFNAMSIZ);
1104 }
1105 if (*p == '\0')
1106 break;
1107 q = p + 1;
1108 }
1109 }
1110set:
1111 biba_set_effective(dest, type, 0, NULL);
1112 biba_set_range(dest, type, 0, NULL, type, 0, NULL);
1113}
1114
1115static void
1116biba_ifnet_create_mbuf(struct ifnet *ifp, struct label *ifplabel,
1117 struct mbuf *m, struct label *mlabel)
1118{
1119 struct mac_biba *source, *dest;
1120
1121 source = SLOT(ifplabel);
1122 dest = SLOT(mlabel);
1123
1124 biba_copy_effective(source, dest);
1125}
1126
1127static void
1128biba_ifnet_relabel(struct ucred *cred, struct ifnet *ifp,
1129 struct label *ifplabel, struct label *newlabel)
1130{
1131 struct mac_biba *source, *dest;
1132
1133 source = SLOT(newlabel);
1134 dest = SLOT(ifplabel);
1135
1136 biba_copy(source, dest);
1137}
1138
1139static int
1140biba_inpcb_check_deliver(struct inpcb *inp, struct label *inplabel,
1141 struct mbuf *m, struct label *mlabel)
1142{
1143 struct mac_biba *p, *i;
1144
1145 if (!biba_enabled)
1146 return (0);
1147
1148 p = SLOT(mlabel);
1149 i = SLOT(inplabel);
1150
1151 return (biba_equal_effective(p, i) ? 0 : EACCES);
1152}
1153
1154static int
1155biba_inpcb_check_visible(struct ucred *cred, struct inpcb *inp,
1156 struct label *inplabel)
1157{
1158 struct mac_biba *subj, *obj;
1159
1160 if (!biba_enabled)
1161 return (0);
1162
1163 subj = SLOT(cred->cr_label);
1164 obj = SLOT(inplabel);
1165
1166 if (!biba_dominate_effective(obj, subj))
1167 return (ENOENT);
1168
1169 return (0);
1170}
1171
1172static void
1173biba_inpcb_create(struct socket *so, struct label *solabel,
1174 struct inpcb *inp, struct label *inplabel)
1175{
1176 struct mac_biba *source, *dest;
1177
1178 source = SLOT(solabel);
1179 dest = SLOT(inplabel);
1180
1181 SOCK_LOCK(so);
1182 biba_copy_effective(source, dest);
1183 SOCK_UNLOCK(so);
1184}
1185
1186static void
1187biba_inpcb_create_mbuf(struct inpcb *inp, struct label *inplabel,
1188 struct mbuf *m, struct label *mlabel)
1189{
1190 struct mac_biba *source, *dest;
1191
1192 source = SLOT(inplabel);
1193 dest = SLOT(mlabel);
1194
1195 biba_copy_effective(source, dest);
1196}
1197
1198static void
1199biba_inpcb_sosetlabel(struct socket *so, struct label *solabel,
1200 struct inpcb *inp, struct label *inplabel)
1201{
1202 struct mac_biba *source, *dest;
1203
1204 SOCK_LOCK_ASSERT(so);
1205
1206 source = SLOT(solabel);
1207 dest = SLOT(inplabel);
1208
1209 biba_copy(source, dest);
1210}
1211
1212static void
1213biba_ip6q_create(struct mbuf *m, struct label *mlabel, struct ip6q *q6,
1214 struct label *q6label)
1215{
1216 struct mac_biba *source, *dest;
1217
1218 source = SLOT(mlabel);
1219 dest = SLOT(q6label);
1220
1221 biba_copy_effective(source, dest);
1222}
1223
1224static int
1225biba_ip6q_match(struct mbuf *m, struct label *mlabel, struct ip6q *q6,
1226 struct label *q6label)
1227{
1228 struct mac_biba *a, *b;
1229
1230 a = SLOT(q6label);
1231 b = SLOT(mlabel);
1232
1233 return (biba_equal_effective(a, b));
1234}
1235
1236static void
1237biba_ip6q_reassemble(struct ip6q *q6, struct label *q6label, struct mbuf *m,
1238 struct label *mlabel)
1239{
1240 struct mac_biba *source, *dest;
1241
1242 source = SLOT(q6label);
1243 dest = SLOT(mlabel);
1244
1245 /* Just use the head, since we require them all to match. */
1246 biba_copy_effective(source, dest);
1247}
1248
1249static void
1250biba_ip6q_update(struct mbuf *m, struct label *mlabel, struct ip6q *q6,
1251 struct label *q6label)
1252{
1253
1254 /* NOOP: we only accept matching labels, so no need to update */
1255}
1256
1257static void
1258biba_ipq_create(struct mbuf *m, struct label *mlabel, struct ipq *q,
1259 struct label *qlabel)
1260{
1261 struct mac_biba *source, *dest;
1262
1263 source = SLOT(mlabel);
1264 dest = SLOT(qlabel);
1265
1266 biba_copy_effective(source, dest);
1267}
1268
1269static int
1270biba_ipq_match(struct mbuf *m, struct label *mlabel, struct ipq *q,
1271 struct label *qlabel)
1272{
1273 struct mac_biba *a, *b;
1274
1275 a = SLOT(qlabel);
1276 b = SLOT(mlabel);
1277
1278 return (biba_equal_effective(a, b));
1279}
1280
1281static void
1282biba_ipq_reassemble(struct ipq *q, struct label *qlabel, struct mbuf *m,
1283 struct label *mlabel)
1284{
1285 struct mac_biba *source, *dest;
1286
1287 source = SLOT(qlabel);
1288 dest = SLOT(mlabel);
1289
1290 /* Just use the head, since we require them all to match. */
1291 biba_copy_effective(source, dest);
1292}
1293
1294static void
1295biba_ipq_update(struct mbuf *m, struct label *mlabel, struct ipq *q,
1296 struct label *qlabel)
1297{
1298
1299 /* NOOP: we only accept matching labels, so no need to update */
1300}
1301
1302static int
1303biba_kld_check_load(struct ucred *cred, struct vnode *vp,
1304 struct label *vplabel)
1305{
1306 struct mac_biba *subj, *obj;
1307 int error;
1308
1309 if (!biba_enabled)
1310 return (0);
1311
1312 subj = SLOT(cred->cr_label);
1313
1314 error = biba_subject_privileged(subj);
1315 if (error)
1316 return (error);
1317
1318 obj = SLOT(vplabel);
1319 if (!biba_high_effective(obj))
1320 return (EACCES);
1321
1322 return (0);
1323}
1324
1325static int
1326biba_mount_check_stat(struct ucred *cred, struct mount *mp,
1327 struct label *mplabel)
1328{
1329 struct mac_biba *subj, *obj;
1330
1331 if (!biba_enabled)
1332 return (0);
1333
1334 subj = SLOT(cred->cr_label);
1335 obj = SLOT(mplabel);
1336
1337 if (!biba_dominate_effective(obj, subj))
1338 return (EACCES);
1339
1340 return (0);
1341}
1342
1343static void
1344biba_mount_create(struct ucred *cred, struct mount *mp,
1345 struct label *mplabel)
1346{
1347 struct mac_biba *source, *dest;
1348
1349 source = SLOT(cred->cr_label);
1350 dest = SLOT(mplabel);
1351
1352 biba_copy_effective(source, dest);
1353}
1354
1355static void
1356biba_netatalk_aarp_send(struct ifnet *ifp, struct label *ifplabel,
1357 struct mbuf *m, struct label *mlabel)
1358{
1359 struct mac_biba *dest;
1360
1361 dest = SLOT(mlabel);
1362
1363 biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL);
1364}
1365
1366static void
1367biba_netinet_arp_send(struct ifnet *ifp, struct label *ifplabel,
1368 struct mbuf *m, struct label *mlabel)
1369{
1370 struct mac_biba *dest;
1371
1372 dest = SLOT(mlabel);
1373
1374 biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL);
1375}
1376
1377static void
1378biba_netinet_firewall_reply(struct mbuf *mrecv, struct label *mrecvlabel,
1379 struct mbuf *msend, struct label *msendlabel)
1380{
1381 struct mac_biba *source, *dest;
1382
1383 source = SLOT(mrecvlabel);
1384 dest = SLOT(msendlabel);
1385
1386 biba_copy_effective(source, dest);
1387}
1388
1389static void
1390biba_netinet_firewall_send(struct mbuf *m, struct label *mlabel)
1391{
1392 struct mac_biba *dest;
1393
1394 dest = SLOT(mlabel);
1395
1396 /* XXX: where is the label for the firewall really coming from? */
1397 biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL);
1398}
1399
1400static void
1401biba_netinet_fragment(struct mbuf *m, struct label *mlabel,
1402 struct mbuf *frag, struct label *fraglabel)
1403{
1404 struct mac_biba *source, *dest;
1405
1406 source = SLOT(mlabel);
1407 dest = SLOT(fraglabel);
1408
1409 biba_copy_effective(source, dest);
1410}
1411
1412static void
1413biba_netinet_icmp_reply(struct mbuf *mrecv, struct label *mrecvlabel,
1414 struct mbuf *msend, struct label *msendlabel)
1415{
1416 struct mac_biba *source, *dest;
1417
1418 source = SLOT(mrecvlabel);
1419 dest = SLOT(msendlabel);
1420
1421 biba_copy_effective(source, dest);
1422}
1423
1424static void
1425biba_netinet_igmp_send(struct ifnet *ifp, struct label *ifplabel,
1426 struct mbuf *m, struct label *mlabel)
1427{
1428 struct mac_biba *dest;
1429
1430 dest = SLOT(mlabel);
1431
1432 biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL);
1433}
1434
1435static void
1436biba_netinet6_nd6_send(struct ifnet *ifp, struct label *ifplabel,
1437 struct mbuf *m, struct label *mlabel)
1438{
1439 struct mac_biba *dest;
1440
1441 dest = SLOT(mlabel);
1442
1443 biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL);
1444}
1445
1446static int
1447biba_pipe_check_ioctl(struct ucred *cred, struct pipepair *pp,
1448 struct label *pplabel, unsigned long cmd, void /* caddr_t */ *data)
1449{
1450
1451 if(!biba_enabled)
1452 return (0);
1453
1454 /* XXX: This will be implemented soon... */
1455
1456 return (0);
1457}
1458
1459static int
1460biba_pipe_check_poll(struct ucred *cred, struct pipepair *pp,
1461 struct label *pplabel)
1462{
1463 struct mac_biba *subj, *obj;
1464
1465 if (!biba_enabled)
1466 return (0);
1467
1468 subj = SLOT(cred->cr_label);
1469 obj = SLOT(pplabel);
1470
1471 if (!biba_dominate_effective(obj, subj))
1472 return (EACCES);
1473
1474 return (0);
1475}
1476
1477static int
1478biba_pipe_check_read(struct ucred *cred, struct pipepair *pp,
1479 struct label *pplabel)
1480{
1481 struct mac_biba *subj, *obj;
1482
1483 if (!biba_enabled)
1484 return (0);
1485
1486 subj = SLOT(cred->cr_label);
1487 obj = SLOT(pplabel);
1488
1489 if (!biba_dominate_effective(obj, subj))
1490 return (EACCES);
1491
1492 return (0);
1493}
1494
1495static int
1496biba_pipe_check_relabel(struct ucred *cred, struct pipepair *pp,
1497 struct label *pplabel, struct label *newlabel)
1498{
1499 struct mac_biba *subj, *obj, *new;
1500 int error;
1501
1502 new = SLOT(newlabel);
1503 subj = SLOT(cred->cr_label);
1504 obj = SLOT(pplabel);
1505
1506 /*
1507 * If there is a Biba label update for a pipe, it must be a effective
1508 * update.
1509 */
1510 error = biba_atmostflags(new, MAC_BIBA_FLAG_EFFECTIVE);
1511 if (error)
1512 return (error);
1513
1514 /*
1515 * To perform a relabel of a pipe (Biba label or not), Biba must
1516 * authorize the relabel.
1517 */
1518 if (!biba_effective_in_range(obj, subj))
1519 return (EPERM);
1520
1521 /*
1522 * If the Biba label is to be changed, authorize as appropriate.
1523 */
1524 if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) {
1525 /*
1526 * To change the Biba label on a pipe, the new pipe label
1527 * must be in the subject range.
1528 */
1529 if (!biba_effective_in_range(new, subj))
1530 return (EPERM);
1531
1532 /*
1533 * To change the Biba label on a pipe to be EQUAL, the
1534 * subject must have appropriate privilege.
1535 */
1536 if (biba_contains_equal(new)) {
1537 error = biba_subject_privileged(subj);
1538 if (error)
1539 return (error);
1540 }
1541 }
1542
1543 return (0);
1544}
1545
1546static int
1547biba_pipe_check_stat(struct ucred *cred, struct pipepair *pp,
1548 struct label *pplabel)
1549{
1550 struct mac_biba *subj, *obj;
1551
1552 if (!biba_enabled)
1553 return (0);
1554
1555 subj = SLOT(cred->cr_label);
1556 obj = SLOT(pplabel);
1557
1558 if (!biba_dominate_effective(obj, subj))
1559 return (EACCES);
1560
1561 return (0);
1562}
1563
1564static int
1565biba_pipe_check_write(struct ucred *cred, struct pipepair *pp,
1566 struct label *pplabel)
1567{
1568 struct mac_biba *subj, *obj;
1569
1570 if (!biba_enabled)
1571 return (0);
1572
1573 subj = SLOT(cred->cr_label);
1574 obj = SLOT(pplabel);
1575
1576 if (!biba_dominate_effective(subj, obj))
1577 return (EACCES);
1578
1579 return (0);
1580}
1581
1582static void
1583biba_pipe_create(struct ucred *cred, struct pipepair *pp,
1584 struct label *pplabel)
1585{
1586 struct mac_biba *source, *dest;
1587
1588 source = SLOT(cred->cr_label);
1589 dest = SLOT(pplabel);
1590
1591 biba_copy_effective(source, dest);
1592}
1593
1594static void
1595biba_pipe_relabel(struct ucred *cred, struct pipepair *pp,
1596 struct label *pplabel, struct label *newlabel)
1597{
1598 struct mac_biba *source, *dest;
1599
1600 source = SLOT(newlabel);
1601 dest = SLOT(pplabel);
1602
1603 biba_copy(source, dest);
1604}
1605
1606static int
1607biba_posixsem_check_openunlink(struct ucred *cred, struct ksem *ks,
1608 struct label *kslabel)
1609{
1610 struct mac_biba *subj, *obj;
1611
1612 if (!biba_enabled)
1613 return (0);
1614
1615 subj = SLOT(cred->cr_label);
1616 obj = SLOT(kslabel);
1617
1618 if (!biba_dominate_effective(subj, obj))
1619 return (EACCES);
1620
1621 return (0);
1622}
1623
1624static int
| 42 */
43
44/*
45 * Developed by the TrustedBSD Project.
46 *
47 * Biba fixed label mandatory integrity policy.
48 */
49
50#include <sys/param.h>
51#include <sys/conf.h>
52#include <sys/extattr.h>
53#include <sys/kernel.h>
54#include <sys/ksem.h>
55#include <sys/malloc.h>
56#include <sys/mman.h>
57#include <sys/mount.h>
58#include <sys/priv.h>
59#include <sys/proc.h>
60#include <sys/sbuf.h>
61#include <sys/systm.h>
62#include <sys/sysproto.h>
63#include <sys/sysent.h>
64#include <sys/systm.h>
65#include <sys/vnode.h>
66#include <sys/file.h>
67#include <sys/socket.h>
68#include <sys/socketvar.h>
69#include <sys/pipe.h>
70#include <sys/sx.h>
71#include <sys/sysctl.h>
72#include <sys/msg.h>
73#include <sys/sem.h>
74#include <sys/shm.h>
75
76#include <fs/devfs/devfs.h>
77
78#include <net/bpfdesc.h>
79#include <net/if.h>
80#include <net/if_types.h>
81#include <net/if_var.h>
82
83#include <netinet/in.h>
84#include <netinet/in_pcb.h>
85#include <netinet/ip_var.h>
86
87#include <vm/uma.h>
88#include <vm/vm.h>
89
90#include <security/mac/mac_policy.h>
91#include <security/mac_biba/mac_biba.h>
92
93SYSCTL_DECL(_security_mac);
94
95SYSCTL_NODE(_security_mac, OID_AUTO, biba, CTLFLAG_RW, 0,
96 "TrustedBSD mac_biba policy controls");
97
98static int biba_label_size = sizeof(struct mac_biba);
99SYSCTL_INT(_security_mac_biba, OID_AUTO, label_size, CTLFLAG_RD,
100 &biba_label_size, 0, "Size of struct mac_biba");
101
102static int biba_enabled = 1;
103SYSCTL_INT(_security_mac_biba, OID_AUTO, enabled, CTLFLAG_RW, &biba_enabled,
104 0, "Enforce MAC/Biba policy");
105TUNABLE_INT("security.mac.biba.enabled", &biba_enabled);
106
107static int destroyed_not_inited;
108SYSCTL_INT(_security_mac_biba, OID_AUTO, destroyed_not_inited, CTLFLAG_RD,
109 &destroyed_not_inited, 0, "Count of labels destroyed but not inited");
110
111static int trust_all_interfaces = 0;
112SYSCTL_INT(_security_mac_biba, OID_AUTO, trust_all_interfaces, CTLFLAG_RD,
113 &trust_all_interfaces, 0, "Consider all interfaces 'trusted' by MAC/Biba");
114TUNABLE_INT("security.mac.biba.trust_all_interfaces", &trust_all_interfaces);
115
116static char trusted_interfaces[128];
117SYSCTL_STRING(_security_mac_biba, OID_AUTO, trusted_interfaces, CTLFLAG_RD,
118 trusted_interfaces, 0, "Interfaces considered 'trusted' by MAC/Biba");
119TUNABLE_STR("security.mac.biba.trusted_interfaces", trusted_interfaces,
120 sizeof(trusted_interfaces));
121
122static int max_compartments = MAC_BIBA_MAX_COMPARTMENTS;
123SYSCTL_INT(_security_mac_biba, OID_AUTO, max_compartments, CTLFLAG_RD,
124 &max_compartments, 0, "Maximum supported compartments");
125
126static int ptys_equal = 0;
127SYSCTL_INT(_security_mac_biba, OID_AUTO, ptys_equal, CTLFLAG_RW, &ptys_equal,
128 0, "Label pty devices as biba/equal on create");
129TUNABLE_INT("security.mac.biba.ptys_equal", &ptys_equal);
130
131static int interfaces_equal = 1;
132SYSCTL_INT(_security_mac_biba, OID_AUTO, interfaces_equal, CTLFLAG_RW,
133 &interfaces_equal, 0, "Label network interfaces as biba/equal on create");
134TUNABLE_INT("security.mac.biba.interfaces_equal", &interfaces_equal);
135
136static int revocation_enabled = 0;
137SYSCTL_INT(_security_mac_biba, OID_AUTO, revocation_enabled, CTLFLAG_RW,
138 &revocation_enabled, 0, "Revoke access to objects on relabel");
139TUNABLE_INT("security.mac.biba.revocation_enabled", &revocation_enabled);
140
141static int biba_slot;
142#define SLOT(l) ((struct mac_biba *)mac_label_get((l), biba_slot))
143#define SLOT_SET(l, val) mac_label_set((l), biba_slot, (uintptr_t)(val))
144
145static uma_zone_t zone_biba;
146
147static __inline int
148biba_bit_set_empty(u_char *set) {
149 int i;
150
151 for (i = 0; i < MAC_BIBA_MAX_COMPARTMENTS >> 3; i++)
152 if (set[i] != 0)
153 return (0);
154 return (1);
155}
156
157static struct mac_biba *
158biba_alloc(int flag)
159{
160
161 return (uma_zalloc(zone_biba, flag | M_ZERO));
162}
163
164static void
165biba_free(struct mac_biba *mb)
166{
167
168 if (mb != NULL)
169 uma_zfree(zone_biba, mb);
170 else
171 atomic_add_int(&destroyed_not_inited, 1);
172}
173
174static int
175biba_atmostflags(struct mac_biba *mb, int flags)
176{
177
178 if ((mb->mb_flags & flags) != mb->mb_flags)
179 return (EINVAL);
180 return (0);
181}
182
183static int
184biba_dominate_element(struct mac_biba_element *a, struct mac_biba_element *b)
185{
186 int bit;
187
188 switch (a->mbe_type) {
189 case MAC_BIBA_TYPE_EQUAL:
190 case MAC_BIBA_TYPE_HIGH:
191 return (1);
192
193 case MAC_BIBA_TYPE_LOW:
194 switch (b->mbe_type) {
195 case MAC_BIBA_TYPE_GRADE:
196 case MAC_BIBA_TYPE_HIGH:
197 return (0);
198
199 case MAC_BIBA_TYPE_EQUAL:
200 case MAC_BIBA_TYPE_LOW:
201 return (1);
202
203 default:
204 panic("biba_dominate_element: b->mbe_type invalid");
205 }
206
207 case MAC_BIBA_TYPE_GRADE:
208 switch (b->mbe_type) {
209 case MAC_BIBA_TYPE_EQUAL:
210 case MAC_BIBA_TYPE_LOW:
211 return (1);
212
213 case MAC_BIBA_TYPE_HIGH:
214 return (0);
215
216 case MAC_BIBA_TYPE_GRADE:
217 for (bit = 1; bit <= MAC_BIBA_MAX_COMPARTMENTS; bit++)
218 if (!MAC_BIBA_BIT_TEST(bit,
219 a->mbe_compartments) &&
220 MAC_BIBA_BIT_TEST(bit, b->mbe_compartments))
221 return (0);
222 return (a->mbe_grade >= b->mbe_grade);
223
224 default:
225 panic("biba_dominate_element: b->mbe_type invalid");
226 }
227
228 default:
229 panic("biba_dominate_element: a->mbe_type invalid");
230 }
231
232 return (0);
233}
234
235static int
236biba_subject_dominate_high(struct mac_biba *mb)
237{
238 struct mac_biba_element *element;
239
240 KASSERT((mb->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0,
241 ("biba_effective_in_range: mb not effective"));
242 element = &mb->mb_effective;
243
244 return (element->mbe_type == MAC_BIBA_TYPE_EQUAL ||
245 element->mbe_type == MAC_BIBA_TYPE_HIGH);
246}
247
248static int
249biba_range_in_range(struct mac_biba *rangea, struct mac_biba *rangeb)
250{
251
252 return (biba_dominate_element(&rangeb->mb_rangehigh,
253 &rangea->mb_rangehigh) &&
254 biba_dominate_element(&rangea->mb_rangelow,
255 &rangeb->mb_rangelow));
256}
257
258static int
259biba_effective_in_range(struct mac_biba *effective, struct mac_biba *range)
260{
261
262 KASSERT((effective->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0,
263 ("biba_effective_in_range: a not effective"));
264 KASSERT((range->mb_flags & MAC_BIBA_FLAG_RANGE) != 0,
265 ("biba_effective_in_range: b not range"));
266
267 return (biba_dominate_element(&range->mb_rangehigh,
268 &effective->mb_effective) &&
269 biba_dominate_element(&effective->mb_effective,
270 &range->mb_rangelow));
271
272 return (1);
273}
274
275static int
276biba_dominate_effective(struct mac_biba *a, struct mac_biba *b)
277{
278 KASSERT((a->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0,
279 ("biba_dominate_effective: a not effective"));
280 KASSERT((b->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0,
281 ("biba_dominate_effective: b not effective"));
282
283 return (biba_dominate_element(&a->mb_effective, &b->mb_effective));
284}
285
286static int
287biba_equal_element(struct mac_biba_element *a, struct mac_biba_element *b)
288{
289
290 if (a->mbe_type == MAC_BIBA_TYPE_EQUAL ||
291 b->mbe_type == MAC_BIBA_TYPE_EQUAL)
292 return (1);
293
294 return (a->mbe_type == b->mbe_type && a->mbe_grade == b->mbe_grade);
295}
296
297static int
298biba_equal_effective(struct mac_biba *a, struct mac_biba *b)
299{
300
301 KASSERT((a->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0,
302 ("biba_equal_effective: a not effective"));
303 KASSERT((b->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0,
304 ("biba_equal_effective: b not effective"));
305
306 return (biba_equal_element(&a->mb_effective, &b->mb_effective));
307}
308
309static int
310biba_contains_equal(struct mac_biba *mb)
311{
312
313 if (mb->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) {
314 if (mb->mb_effective.mbe_type == MAC_BIBA_TYPE_EQUAL)
315 return (1);
316 }
317
318 if (mb->mb_flags & MAC_BIBA_FLAG_RANGE) {
319 if (mb->mb_rangelow.mbe_type == MAC_BIBA_TYPE_EQUAL)
320 return (1);
321 if (mb->mb_rangehigh.mbe_type == MAC_BIBA_TYPE_EQUAL)
322 return (1);
323 }
324
325 return (0);
326}
327
328static int
329biba_subject_privileged(struct mac_biba *mb)
330{
331
332 KASSERT((mb->mb_flags & MAC_BIBA_FLAGS_BOTH) == MAC_BIBA_FLAGS_BOTH,
333 ("biba_subject_privileged: subject doesn't have both labels"));
334
335 /* If the effective is EQUAL, it's ok. */
336 if (mb->mb_effective.mbe_type == MAC_BIBA_TYPE_EQUAL)
337 return (0);
338
339 /* If either range endpoint is EQUAL, it's ok. */
340 if (mb->mb_rangelow.mbe_type == MAC_BIBA_TYPE_EQUAL ||
341 mb->mb_rangehigh.mbe_type == MAC_BIBA_TYPE_EQUAL)
342 return (0);
343
344 /* If the range is low-high, it's ok. */
345 if (mb->mb_rangelow.mbe_type == MAC_BIBA_TYPE_LOW &&
346 mb->mb_rangehigh.mbe_type == MAC_BIBA_TYPE_HIGH)
347 return (0);
348
349 /* It's not ok. */
350 return (EPERM);
351}
352
353static int
354biba_high_effective(struct mac_biba *mb)
355{
356
357 KASSERT((mb->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0,
358 ("biba_equal_effective: mb not effective"));
359
360 return (mb->mb_effective.mbe_type == MAC_BIBA_TYPE_HIGH);
361}
362
363static int
364biba_valid(struct mac_biba *mb)
365{
366
367 if (mb->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) {
368 switch (mb->mb_effective.mbe_type) {
369 case MAC_BIBA_TYPE_GRADE:
370 break;
371
372 case MAC_BIBA_TYPE_EQUAL:
373 case MAC_BIBA_TYPE_HIGH:
374 case MAC_BIBA_TYPE_LOW:
375 if (mb->mb_effective.mbe_grade != 0 ||
376 !MAC_BIBA_BIT_SET_EMPTY(
377 mb->mb_effective.mbe_compartments))
378 return (EINVAL);
379 break;
380
381 default:
382 return (EINVAL);
383 }
384 } else {
385 if (mb->mb_effective.mbe_type != MAC_BIBA_TYPE_UNDEF)
386 return (EINVAL);
387 }
388
389 if (mb->mb_flags & MAC_BIBA_FLAG_RANGE) {
390 switch (mb->mb_rangelow.mbe_type) {
391 case MAC_BIBA_TYPE_GRADE:
392 break;
393
394 case MAC_BIBA_TYPE_EQUAL:
395 case MAC_BIBA_TYPE_HIGH:
396 case MAC_BIBA_TYPE_LOW:
397 if (mb->mb_rangelow.mbe_grade != 0 ||
398 !MAC_BIBA_BIT_SET_EMPTY(
399 mb->mb_rangelow.mbe_compartments))
400 return (EINVAL);
401 break;
402
403 default:
404 return (EINVAL);
405 }
406
407 switch (mb->mb_rangehigh.mbe_type) {
408 case MAC_BIBA_TYPE_GRADE:
409 break;
410
411 case MAC_BIBA_TYPE_EQUAL:
412 case MAC_BIBA_TYPE_HIGH:
413 case MAC_BIBA_TYPE_LOW:
414 if (mb->mb_rangehigh.mbe_grade != 0 ||
415 !MAC_BIBA_BIT_SET_EMPTY(
416 mb->mb_rangehigh.mbe_compartments))
417 return (EINVAL);
418 break;
419
420 default:
421 return (EINVAL);
422 }
423 if (!biba_dominate_element(&mb->mb_rangehigh,
424 &mb->mb_rangelow))
425 return (EINVAL);
426 } else {
427 if (mb->mb_rangelow.mbe_type != MAC_BIBA_TYPE_UNDEF ||
428 mb->mb_rangehigh.mbe_type != MAC_BIBA_TYPE_UNDEF)
429 return (EINVAL);
430 }
431
432 return (0);
433}
434
435static void
436biba_set_range(struct mac_biba *mb, u_short typelow, u_short gradelow,
437 u_char *compartmentslow, u_short typehigh, u_short gradehigh,
438 u_char *compartmentshigh)
439{
440
441 mb->mb_rangelow.mbe_type = typelow;
442 mb->mb_rangelow.mbe_grade = gradelow;
443 if (compartmentslow != NULL)
444 memcpy(mb->mb_rangelow.mbe_compartments, compartmentslow,
445 sizeof(mb->mb_rangelow.mbe_compartments));
446 mb->mb_rangehigh.mbe_type = typehigh;
447 mb->mb_rangehigh.mbe_grade = gradehigh;
448 if (compartmentshigh != NULL)
449 memcpy(mb->mb_rangehigh.mbe_compartments, compartmentshigh,
450 sizeof(mb->mb_rangehigh.mbe_compartments));
451 mb->mb_flags |= MAC_BIBA_FLAG_RANGE;
452}
453
454static void
455biba_set_effective(struct mac_biba *mb, u_short type, u_short grade,
456 u_char *compartments)
457{
458
459 mb->mb_effective.mbe_type = type;
460 mb->mb_effective.mbe_grade = grade;
461 if (compartments != NULL)
462 memcpy(mb->mb_effective.mbe_compartments, compartments,
463 sizeof(mb->mb_effective.mbe_compartments));
464 mb->mb_flags |= MAC_BIBA_FLAG_EFFECTIVE;
465}
466
467static void
468biba_copy_range(struct mac_biba *labelfrom, struct mac_biba *labelto)
469{
470
471 KASSERT((labelfrom->mb_flags & MAC_BIBA_FLAG_RANGE) != 0,
472 ("biba_copy_range: labelfrom not range"));
473
474 labelto->mb_rangelow = labelfrom->mb_rangelow;
475 labelto->mb_rangehigh = labelfrom->mb_rangehigh;
476 labelto->mb_flags |= MAC_BIBA_FLAG_RANGE;
477}
478
479static void
480biba_copy_effective(struct mac_biba *labelfrom, struct mac_biba *labelto)
481{
482
483 KASSERT((labelfrom->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0,
484 ("biba_copy_effective: labelfrom not effective"));
485
486 labelto->mb_effective = labelfrom->mb_effective;
487 labelto->mb_flags |= MAC_BIBA_FLAG_EFFECTIVE;
488}
489
490static void
491biba_copy(struct mac_biba *source, struct mac_biba *dest)
492{
493
494 if (source->mb_flags & MAC_BIBA_FLAG_EFFECTIVE)
495 biba_copy_effective(source, dest);
496 if (source->mb_flags & MAC_BIBA_FLAG_RANGE)
497 biba_copy_range(source, dest);
498}
499
500/*
501 * Policy module operations.
502 */
503static void
504biba_init(struct mac_policy_conf *conf)
505{
506
507 zone_biba = uma_zcreate("mac_biba", sizeof(struct mac_biba), NULL,
508 NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
509}
510
511/*
512 * Label operations.
513 */
514static void
515biba_init_label(struct label *label)
516{
517
518 SLOT_SET(label, biba_alloc(M_WAITOK));
519}
520
521static int
522biba_init_label_waitcheck(struct label *label, int flag)
523{
524
525 SLOT_SET(label, biba_alloc(flag));
526 if (SLOT(label) == NULL)
527 return (ENOMEM);
528
529 return (0);
530}
531
532static void
533biba_destroy_label(struct label *label)
534{
535
536 biba_free(SLOT(label));
537 SLOT_SET(label, NULL);
538}
539
540/*
541 * biba_element_to_string() accepts an sbuf and Biba element. It converts
542 * the Biba element to a string and stores the result in the sbuf; if there
543 * isn't space in the sbuf, -1 is returned.
544 */
545static int
546biba_element_to_string(struct sbuf *sb, struct mac_biba_element *element)
547{
548 int i, first;
549
550 switch (element->mbe_type) {
551 case MAC_BIBA_TYPE_HIGH:
552 return (sbuf_printf(sb, "high"));
553
554 case MAC_BIBA_TYPE_LOW:
555 return (sbuf_printf(sb, "low"));
556
557 case MAC_BIBA_TYPE_EQUAL:
558 return (sbuf_printf(sb, "equal"));
559
560 case MAC_BIBA_TYPE_GRADE:
561 if (sbuf_printf(sb, "%d", element->mbe_grade) == -1)
562 return (-1);
563
564 first = 1;
565 for (i = 1; i <= MAC_BIBA_MAX_COMPARTMENTS; i++) {
566 if (MAC_BIBA_BIT_TEST(i, element->mbe_compartments)) {
567 if (first) {
568 if (sbuf_putc(sb, ':') == -1)
569 return (-1);
570 if (sbuf_printf(sb, "%d", i) == -1)
571 return (-1);
572 first = 0;
573 } else {
574 if (sbuf_printf(sb, "+%d", i) == -1)
575 return (-1);
576 }
577 }
578 }
579 return (0);
580
581 default:
582 panic("biba_element_to_string: invalid type (%d)",
583 element->mbe_type);
584 }
585}
586
587/*
588 * biba_to_string() converts a Biba label to a string, and places the results
589 * in the passed sbuf. It returns 0 on success, or EINVAL if there isn't
590 * room in the sbuf. Note: the sbuf will be modified even in a failure case,
591 * so the caller may need to revert the sbuf by restoring the offset if
592 * that's undesired.
593 */
594static int
595biba_to_string(struct sbuf *sb, struct mac_biba *mb)
596{
597
598 if (mb->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) {
599 if (biba_element_to_string(sb, &mb->mb_effective) == -1)
600 return (EINVAL);
601 }
602
603 if (mb->mb_flags & MAC_BIBA_FLAG_RANGE) {
604 if (sbuf_putc(sb, '(') == -1)
605 return (EINVAL);
606
607 if (biba_element_to_string(sb, &mb->mb_rangelow) == -1)
608 return (EINVAL);
609
610 if (sbuf_putc(sb, '-') == -1)
611 return (EINVAL);
612
613 if (biba_element_to_string(sb, &mb->mb_rangehigh) == -1)
614 return (EINVAL);
615
616 if (sbuf_putc(sb, ')') == -1)
617 return (EINVAL);
618 }
619
620 return (0);
621}
622
623static int
624biba_externalize_label(struct label *label, char *element_name,
625 struct sbuf *sb, int *claimed)
626{
627 struct mac_biba *mb;
628
629 if (strcmp(MAC_BIBA_LABEL_NAME, element_name) != 0)
630 return (0);
631
632 (*claimed)++;
633
634 mb = SLOT(label);
635 return (biba_to_string(sb, mb));
636}
637
638static int
639biba_parse_element(struct mac_biba_element *element, char *string)
640{
641 char *compartment, *end, *grade;
642 int value;
643
644 if (strcmp(string, "high") == 0 || strcmp(string, "hi") == 0) {
645 element->mbe_type = MAC_BIBA_TYPE_HIGH;
646 element->mbe_grade = MAC_BIBA_TYPE_UNDEF;
647 } else if (strcmp(string, "low") == 0 || strcmp(string, "lo") == 0) {
648 element->mbe_type = MAC_BIBA_TYPE_LOW;
649 element->mbe_grade = MAC_BIBA_TYPE_UNDEF;
650 } else if (strcmp(string, "equal") == 0 ||
651 strcmp(string, "eq") == 0) {
652 element->mbe_type = MAC_BIBA_TYPE_EQUAL;
653 element->mbe_grade = MAC_BIBA_TYPE_UNDEF;
654 } else {
655 element->mbe_type = MAC_BIBA_TYPE_GRADE;
656
657 /*
658 * Numeric grade piece of the element.
659 */
660 grade = strsep(&string, ":");
661 value = strtol(grade, &end, 10);
662 if (end == grade || *end != '\0')
663 return (EINVAL);
664 if (value < 0 || value > 65535)
665 return (EINVAL);
666 element->mbe_grade = value;
667
668 /*
669 * Optional compartment piece of the element. If none are
670 * included, we assume that the label has no compartments.
671 */
672 if (string == NULL)
673 return (0);
674 if (*string == '\0')
675 return (0);
676
677 while ((compartment = strsep(&string, "+")) != NULL) {
678 value = strtol(compartment, &end, 10);
679 if (compartment == end || *end != '\0')
680 return (EINVAL);
681 if (value < 1 || value > MAC_BIBA_MAX_COMPARTMENTS)
682 return (EINVAL);
683 MAC_BIBA_BIT_SET(value, element->mbe_compartments);
684 }
685 }
686
687 return (0);
688}
689
690/*
691 * Note: destructively consumes the string, make a local copy before calling
692 * if that's a problem.
693 */
694static int
695biba_parse(struct mac_biba *mb, char *string)
696{
697 char *rangehigh, *rangelow, *effective;
698 int error;
699
700 effective = strsep(&string, "(");
701 if (*effective == '\0')
702 effective = NULL;
703
704 if (string != NULL) {
705 rangelow = strsep(&string, "-");
706 if (string == NULL)
707 return (EINVAL);
708 rangehigh = strsep(&string, ")");
709 if (string == NULL)
710 return (EINVAL);
711 if (*string != '\0')
712 return (EINVAL);
713 } else {
714 rangelow = NULL;
715 rangehigh = NULL;
716 }
717
718 KASSERT((rangelow != NULL && rangehigh != NULL) ||
719 (rangelow == NULL && rangehigh == NULL),
720 ("biba_parse: range mismatch"));
721
722 bzero(mb, sizeof(*mb));
723 if (effective != NULL) {
724 error = biba_parse_element(&mb->mb_effective, effective);
725 if (error)
726 return (error);
727 mb->mb_flags |= MAC_BIBA_FLAG_EFFECTIVE;
728 }
729
730 if (rangelow != NULL) {
731 error = biba_parse_element(&mb->mb_rangelow, rangelow);
732 if (error)
733 return (error);
734 error = biba_parse_element(&mb->mb_rangehigh, rangehigh);
735 if (error)
736 return (error);
737 mb->mb_flags |= MAC_BIBA_FLAG_RANGE;
738 }
739
740 error = biba_valid(mb);
741 if (error)
742 return (error);
743
744 return (0);
745}
746
747static int
748biba_internalize_label(struct label *label, char *element_name,
749 char *element_data, int *claimed)
750{
751 struct mac_biba *mb, mb_temp;
752 int error;
753
754 if (strcmp(MAC_BIBA_LABEL_NAME, element_name) != 0)
755 return (0);
756
757 (*claimed)++;
758
759 error = biba_parse(&mb_temp, element_data);
760 if (error)
761 return (error);
762
763 mb = SLOT(label);
764 *mb = mb_temp;
765
766 return (0);
767}
768
769static void
770biba_copy_label(struct label *src, struct label *dest)
771{
772
773 *SLOT(dest) = *SLOT(src);
774}
775
776/*
777 * Object-specific entry point implementations are sorted alphabetically by
778 * object type name and then by operation.
779 */
780static int
781biba_bpfdesc_check_receive(struct bpf_d *d, struct label *dlabel,
782 struct ifnet *ifp, struct label *ifplabel)
783{
784 struct mac_biba *a, *b;
785
786 if (!biba_enabled)
787 return (0);
788
789 a = SLOT(dlabel);
790 b = SLOT(ifplabel);
791
792 if (biba_equal_effective(a, b))
793 return (0);
794 return (EACCES);
795}
796
797static void
798biba_bpfdesc_create(struct ucred *cred, struct bpf_d *d,
799 struct label *dlabel)
800{
801 struct mac_biba *source, *dest;
802
803 source = SLOT(cred->cr_label);
804 dest = SLOT(dlabel);
805
806 biba_copy_effective(source, dest);
807}
808
809static void
810biba_bpfdesc_create_mbuf(struct bpf_d *d, struct label *dlabel,
811 struct mbuf *m, struct label *mlabel)
812{
813 struct mac_biba *source, *dest;
814
815 source = SLOT(dlabel);
816 dest = SLOT(mlabel);
817
818 biba_copy_effective(source, dest);
819}
820
821static void
822biba_cred_associate_nfsd(struct ucred *cred)
823{
824 struct mac_biba *label;
825
826 label = SLOT(cred->cr_label);
827 biba_set_effective(label, MAC_BIBA_TYPE_LOW, 0, NULL);
828 biba_set_range(label, MAC_BIBA_TYPE_LOW, 0, NULL, MAC_BIBA_TYPE_HIGH,
829 0, NULL);
830}
831
832static int
833biba_cred_check_relabel(struct ucred *cred, struct label *newlabel)
834{
835 struct mac_biba *subj, *new;
836 int error;
837
838 subj = SLOT(cred->cr_label);
839 new = SLOT(newlabel);
840
841 /*
842 * If there is a Biba label update for the credential, it may
843 * be an update of the effective, range, or both.
844 */
845 error = biba_atmostflags(new, MAC_BIBA_FLAGS_BOTH);
846 if (error)
847 return (error);
848
849 /*
850 * If the Biba label is to be changed, authorize as appropriate.
851 */
852 if (new->mb_flags & MAC_BIBA_FLAGS_BOTH) {
853 /*
854 * If the change request modifies both the Biba label
855 * effective and range, check that the new effective will be
856 * in the new range.
857 */
858 if ((new->mb_flags & MAC_BIBA_FLAGS_BOTH) ==
859 MAC_BIBA_FLAGS_BOTH &&
860 !biba_effective_in_range(new, new))
861 return (EINVAL);
862
863 /*
864 * To change the Biba effective label on a credential, the
865 * new effective label must be in the current range.
866 */
867 if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE &&
868 !biba_effective_in_range(new, subj))
869 return (EPERM);
870
871 /*
872 * To change the Biba range on a credential, the new range
873 * label must be in the current range.
874 */
875 if (new->mb_flags & MAC_BIBA_FLAG_RANGE &&
876 !biba_range_in_range(new, subj))
877 return (EPERM);
878
879 /*
880 * To have EQUAL in any component of the new credential Biba
881 * label, the subject must already have EQUAL in their label.
882 */
883 if (biba_contains_equal(new)) {
884 error = biba_subject_privileged(subj);
885 if (error)
886 return (error);
887 }
888 }
889
890 return (0);
891}
892
893static int
894biba_cred_check_visible(struct ucred *u1, struct ucred *u2)
895{
896 struct mac_biba *subj, *obj;
897
898 if (!biba_enabled)
899 return (0);
900
901 subj = SLOT(u1->cr_label);
902 obj = SLOT(u2->cr_label);
903
904 /* XXX: range */
905 if (!biba_dominate_effective(obj, subj))
906 return (ESRCH);
907
908 return (0);
909}
910
911static void
912biba_cred_create_init(struct ucred *cred)
913{
914 struct mac_biba *dest;
915
916 dest = SLOT(cred->cr_label);
917
918 biba_set_effective(dest, MAC_BIBA_TYPE_HIGH, 0, NULL);
919 biba_set_range(dest, MAC_BIBA_TYPE_LOW, 0, NULL, MAC_BIBA_TYPE_HIGH,
920 0, NULL);
921}
922
923static void
924biba_cred_create_swapper(struct ucred *cred)
925{
926 struct mac_biba *dest;
927
928 dest = SLOT(cred->cr_label);
929
930 biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL);
931 biba_set_range(dest, MAC_BIBA_TYPE_LOW, 0, NULL, MAC_BIBA_TYPE_HIGH,
932 0, NULL);
933}
934
935static void
936biba_cred_relabel(struct ucred *cred, struct label *newlabel)
937{
938 struct mac_biba *source, *dest;
939
940 source = SLOT(newlabel);
941 dest = SLOT(cred->cr_label);
942
943 biba_copy(source, dest);
944}
945
946static void
947biba_devfs_create_device(struct ucred *cred, struct mount *mp,
948 struct cdev *dev, struct devfs_dirent *de, struct label *delabel)
949{
950 struct mac_biba *mb;
951 int biba_type;
952
953 mb = SLOT(delabel);
954 if (strcmp(dev->si_name, "null") == 0 ||
955 strcmp(dev->si_name, "zero") == 0 ||
956 strcmp(dev->si_name, "random") == 0 ||
957 strncmp(dev->si_name, "fd/", strlen("fd/")) == 0)
958 biba_type = MAC_BIBA_TYPE_EQUAL;
959 else if (ptys_equal &&
960 (strncmp(dev->si_name, "ttyp", strlen("ttyp")) == 0 ||
961 strncmp(dev->si_name, "pts/", strlen("pts/")) == 0 ||
962 strncmp(dev->si_name, "ptyp", strlen("ptyp")) == 0))
963 biba_type = MAC_BIBA_TYPE_EQUAL;
964 else
965 biba_type = MAC_BIBA_TYPE_HIGH;
966 biba_set_effective(mb, biba_type, 0, NULL);
967}
968
969static void
970biba_devfs_create_directory(struct mount *mp, char *dirname, int dirnamelen,
971 struct devfs_dirent *de, struct label *delabel)
972{
973 struct mac_biba *mb;
974
975 mb = SLOT(delabel);
976
977 biba_set_effective(mb, MAC_BIBA_TYPE_HIGH, 0, NULL);
978}
979
980static void
981biba_devfs_create_symlink(struct ucred *cred, struct mount *mp,
982 struct devfs_dirent *dd, struct label *ddlabel, struct devfs_dirent *de,
983 struct label *delabel)
984{
985 struct mac_biba *source, *dest;
986
987 source = SLOT(cred->cr_label);
988 dest = SLOT(delabel);
989
990 biba_copy_effective(source, dest);
991}
992
993static void
994biba_devfs_update(struct mount *mp, struct devfs_dirent *de,
995 struct label *delabel, struct vnode *vp, struct label *vplabel)
996{
997 struct mac_biba *source, *dest;
998
999 source = SLOT(vplabel);
1000 dest = SLOT(delabel);
1001
1002 biba_copy(source, dest);
1003}
1004
1005static void
1006biba_devfs_vnode_associate(struct mount *mp, struct label *mntlabel,
1007 struct devfs_dirent *de, struct label *delabel, struct vnode *vp,
1008 struct label *vplabel)
1009{
1010 struct mac_biba *source, *dest;
1011
1012 source = SLOT(delabel);
1013 dest = SLOT(vplabel);
1014
1015 biba_copy_effective(source, dest);
1016}
1017
1018static int
1019biba_ifnet_check_relabel(struct ucred *cred, struct ifnet *ifp,
1020 struct label *ifplabel, struct label *newlabel)
1021{
1022 struct mac_biba *subj, *new;
1023 int error;
1024
1025 subj = SLOT(cred->cr_label);
1026 new = SLOT(newlabel);
1027
1028 /*
1029 * If there is a Biba label update for the interface, it may be an
1030 * update of the effective, range, or both.
1031 */
1032 error = biba_atmostflags(new, MAC_BIBA_FLAGS_BOTH);
1033 if (error)
1034 return (error);
1035
1036 /*
1037 * Relabling network interfaces requires Biba privilege.
1038 */
1039 error = biba_subject_privileged(subj);
1040 if (error)
1041 return (error);
1042
1043 return (0);
1044}
1045
1046static int
1047biba_ifnet_check_transmit(struct ifnet *ifp, struct label *ifplabel,
1048 struct mbuf *m, struct label *mlabel)
1049{
1050 struct mac_biba *p, *i;
1051
1052 if (!biba_enabled)
1053 return (0);
1054
1055 p = SLOT(mlabel);
1056 i = SLOT(ifplabel);
1057
1058 return (biba_effective_in_range(p, i) ? 0 : EACCES);
1059}
1060
1061static void
1062biba_ifnet_create(struct ifnet *ifp, struct label *ifplabel)
1063{
1064 char tifname[IFNAMSIZ], *p, *q;
1065 char tiflist[sizeof(trusted_interfaces)];
1066 struct mac_biba *dest;
1067 int len, type;
1068
1069 dest = SLOT(ifplabel);
1070
1071 if (ifp->if_type == IFT_LOOP || interfaces_equal != 0) {
1072 type = MAC_BIBA_TYPE_EQUAL;
1073 goto set;
1074 }
1075
1076 if (trust_all_interfaces) {
1077 type = MAC_BIBA_TYPE_HIGH;
1078 goto set;
1079 }
1080
1081 type = MAC_BIBA_TYPE_LOW;
1082
1083 if (trusted_interfaces[0] == '\0' ||
1084 !strvalid(trusted_interfaces, sizeof(trusted_interfaces)))
1085 goto set;
1086
1087 bzero(tiflist, sizeof(tiflist));
1088 for (p = trusted_interfaces, q = tiflist; *p != '\0'; p++, q++)
1089 if(*p != ' ' && *p != '\t')
1090 *q = *p;
1091
1092 for (p = q = tiflist;; p++) {
1093 if (*p == ',' || *p == '\0') {
1094 len = p - q;
1095 if (len < IFNAMSIZ) {
1096 bzero(tifname, sizeof(tifname));
1097 bcopy(q, tifname, len);
1098 if (strcmp(tifname, ifp->if_xname) == 0) {
1099 type = MAC_BIBA_TYPE_HIGH;
1100 break;
1101 }
1102 } else {
1103 *p = '\0';
1104 printf("mac_biba warning: interface name "
1105 "\"%s\" is too long (must be < %d)\n",
1106 q, IFNAMSIZ);
1107 }
1108 if (*p == '\0')
1109 break;
1110 q = p + 1;
1111 }
1112 }
1113set:
1114 biba_set_effective(dest, type, 0, NULL);
1115 biba_set_range(dest, type, 0, NULL, type, 0, NULL);
1116}
1117
1118static void
1119biba_ifnet_create_mbuf(struct ifnet *ifp, struct label *ifplabel,
1120 struct mbuf *m, struct label *mlabel)
1121{
1122 struct mac_biba *source, *dest;
1123
1124 source = SLOT(ifplabel);
1125 dest = SLOT(mlabel);
1126
1127 biba_copy_effective(source, dest);
1128}
1129
1130static void
1131biba_ifnet_relabel(struct ucred *cred, struct ifnet *ifp,
1132 struct label *ifplabel, struct label *newlabel)
1133{
1134 struct mac_biba *source, *dest;
1135
1136 source = SLOT(newlabel);
1137 dest = SLOT(ifplabel);
1138
1139 biba_copy(source, dest);
1140}
1141
1142static int
1143biba_inpcb_check_deliver(struct inpcb *inp, struct label *inplabel,
1144 struct mbuf *m, struct label *mlabel)
1145{
1146 struct mac_biba *p, *i;
1147
1148 if (!biba_enabled)
1149 return (0);
1150
1151 p = SLOT(mlabel);
1152 i = SLOT(inplabel);
1153
1154 return (biba_equal_effective(p, i) ? 0 : EACCES);
1155}
1156
1157static int
1158biba_inpcb_check_visible(struct ucred *cred, struct inpcb *inp,
1159 struct label *inplabel)
1160{
1161 struct mac_biba *subj, *obj;
1162
1163 if (!biba_enabled)
1164 return (0);
1165
1166 subj = SLOT(cred->cr_label);
1167 obj = SLOT(inplabel);
1168
1169 if (!biba_dominate_effective(obj, subj))
1170 return (ENOENT);
1171
1172 return (0);
1173}
1174
1175static void
1176biba_inpcb_create(struct socket *so, struct label *solabel,
1177 struct inpcb *inp, struct label *inplabel)
1178{
1179 struct mac_biba *source, *dest;
1180
1181 source = SLOT(solabel);
1182 dest = SLOT(inplabel);
1183
1184 SOCK_LOCK(so);
1185 biba_copy_effective(source, dest);
1186 SOCK_UNLOCK(so);
1187}
1188
1189static void
1190biba_inpcb_create_mbuf(struct inpcb *inp, struct label *inplabel,
1191 struct mbuf *m, struct label *mlabel)
1192{
1193 struct mac_biba *source, *dest;
1194
1195 source = SLOT(inplabel);
1196 dest = SLOT(mlabel);
1197
1198 biba_copy_effective(source, dest);
1199}
1200
1201static void
1202biba_inpcb_sosetlabel(struct socket *so, struct label *solabel,
1203 struct inpcb *inp, struct label *inplabel)
1204{
1205 struct mac_biba *source, *dest;
1206
1207 SOCK_LOCK_ASSERT(so);
1208
1209 source = SLOT(solabel);
1210 dest = SLOT(inplabel);
1211
1212 biba_copy(source, dest);
1213}
1214
1215static void
1216biba_ip6q_create(struct mbuf *m, struct label *mlabel, struct ip6q *q6,
1217 struct label *q6label)
1218{
1219 struct mac_biba *source, *dest;
1220
1221 source = SLOT(mlabel);
1222 dest = SLOT(q6label);
1223
1224 biba_copy_effective(source, dest);
1225}
1226
1227static int
1228biba_ip6q_match(struct mbuf *m, struct label *mlabel, struct ip6q *q6,
1229 struct label *q6label)
1230{
1231 struct mac_biba *a, *b;
1232
1233 a = SLOT(q6label);
1234 b = SLOT(mlabel);
1235
1236 return (biba_equal_effective(a, b));
1237}
1238
1239static void
1240biba_ip6q_reassemble(struct ip6q *q6, struct label *q6label, struct mbuf *m,
1241 struct label *mlabel)
1242{
1243 struct mac_biba *source, *dest;
1244
1245 source = SLOT(q6label);
1246 dest = SLOT(mlabel);
1247
1248 /* Just use the head, since we require them all to match. */
1249 biba_copy_effective(source, dest);
1250}
1251
1252static void
1253biba_ip6q_update(struct mbuf *m, struct label *mlabel, struct ip6q *q6,
1254 struct label *q6label)
1255{
1256
1257 /* NOOP: we only accept matching labels, so no need to update */
1258}
1259
1260static void
1261biba_ipq_create(struct mbuf *m, struct label *mlabel, struct ipq *q,
1262 struct label *qlabel)
1263{
1264 struct mac_biba *source, *dest;
1265
1266 source = SLOT(mlabel);
1267 dest = SLOT(qlabel);
1268
1269 biba_copy_effective(source, dest);
1270}
1271
1272static int
1273biba_ipq_match(struct mbuf *m, struct label *mlabel, struct ipq *q,
1274 struct label *qlabel)
1275{
1276 struct mac_biba *a, *b;
1277
1278 a = SLOT(qlabel);
1279 b = SLOT(mlabel);
1280
1281 return (biba_equal_effective(a, b));
1282}
1283
1284static void
1285biba_ipq_reassemble(struct ipq *q, struct label *qlabel, struct mbuf *m,
1286 struct label *mlabel)
1287{
1288 struct mac_biba *source, *dest;
1289
1290 source = SLOT(qlabel);
1291 dest = SLOT(mlabel);
1292
1293 /* Just use the head, since we require them all to match. */
1294 biba_copy_effective(source, dest);
1295}
1296
1297static void
1298biba_ipq_update(struct mbuf *m, struct label *mlabel, struct ipq *q,
1299 struct label *qlabel)
1300{
1301
1302 /* NOOP: we only accept matching labels, so no need to update */
1303}
1304
1305static int
1306biba_kld_check_load(struct ucred *cred, struct vnode *vp,
1307 struct label *vplabel)
1308{
1309 struct mac_biba *subj, *obj;
1310 int error;
1311
1312 if (!biba_enabled)
1313 return (0);
1314
1315 subj = SLOT(cred->cr_label);
1316
1317 error = biba_subject_privileged(subj);
1318 if (error)
1319 return (error);
1320
1321 obj = SLOT(vplabel);
1322 if (!biba_high_effective(obj))
1323 return (EACCES);
1324
1325 return (0);
1326}
1327
1328static int
1329biba_mount_check_stat(struct ucred *cred, struct mount *mp,
1330 struct label *mplabel)
1331{
1332 struct mac_biba *subj, *obj;
1333
1334 if (!biba_enabled)
1335 return (0);
1336
1337 subj = SLOT(cred->cr_label);
1338 obj = SLOT(mplabel);
1339
1340 if (!biba_dominate_effective(obj, subj))
1341 return (EACCES);
1342
1343 return (0);
1344}
1345
1346static void
1347biba_mount_create(struct ucred *cred, struct mount *mp,
1348 struct label *mplabel)
1349{
1350 struct mac_biba *source, *dest;
1351
1352 source = SLOT(cred->cr_label);
1353 dest = SLOT(mplabel);
1354
1355 biba_copy_effective(source, dest);
1356}
1357
1358static void
1359biba_netatalk_aarp_send(struct ifnet *ifp, struct label *ifplabel,
1360 struct mbuf *m, struct label *mlabel)
1361{
1362 struct mac_biba *dest;
1363
1364 dest = SLOT(mlabel);
1365
1366 biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL);
1367}
1368
1369static void
1370biba_netinet_arp_send(struct ifnet *ifp, struct label *ifplabel,
1371 struct mbuf *m, struct label *mlabel)
1372{
1373 struct mac_biba *dest;
1374
1375 dest = SLOT(mlabel);
1376
1377 biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL);
1378}
1379
1380static void
1381biba_netinet_firewall_reply(struct mbuf *mrecv, struct label *mrecvlabel,
1382 struct mbuf *msend, struct label *msendlabel)
1383{
1384 struct mac_biba *source, *dest;
1385
1386 source = SLOT(mrecvlabel);
1387 dest = SLOT(msendlabel);
1388
1389 biba_copy_effective(source, dest);
1390}
1391
1392static void
1393biba_netinet_firewall_send(struct mbuf *m, struct label *mlabel)
1394{
1395 struct mac_biba *dest;
1396
1397 dest = SLOT(mlabel);
1398
1399 /* XXX: where is the label for the firewall really coming from? */
1400 biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL);
1401}
1402
1403static void
1404biba_netinet_fragment(struct mbuf *m, struct label *mlabel,
1405 struct mbuf *frag, struct label *fraglabel)
1406{
1407 struct mac_biba *source, *dest;
1408
1409 source = SLOT(mlabel);
1410 dest = SLOT(fraglabel);
1411
1412 biba_copy_effective(source, dest);
1413}
1414
1415static void
1416biba_netinet_icmp_reply(struct mbuf *mrecv, struct label *mrecvlabel,
1417 struct mbuf *msend, struct label *msendlabel)
1418{
1419 struct mac_biba *source, *dest;
1420
1421 source = SLOT(mrecvlabel);
1422 dest = SLOT(msendlabel);
1423
1424 biba_copy_effective(source, dest);
1425}
1426
1427static void
1428biba_netinet_igmp_send(struct ifnet *ifp, struct label *ifplabel,
1429 struct mbuf *m, struct label *mlabel)
1430{
1431 struct mac_biba *dest;
1432
1433 dest = SLOT(mlabel);
1434
1435 biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL);
1436}
1437
1438static void
1439biba_netinet6_nd6_send(struct ifnet *ifp, struct label *ifplabel,
1440 struct mbuf *m, struct label *mlabel)
1441{
1442 struct mac_biba *dest;
1443
1444 dest = SLOT(mlabel);
1445
1446 biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL);
1447}
1448
1449static int
1450biba_pipe_check_ioctl(struct ucred *cred, struct pipepair *pp,
1451 struct label *pplabel, unsigned long cmd, void /* caddr_t */ *data)
1452{
1453
1454 if(!biba_enabled)
1455 return (0);
1456
1457 /* XXX: This will be implemented soon... */
1458
1459 return (0);
1460}
1461
1462static int
1463biba_pipe_check_poll(struct ucred *cred, struct pipepair *pp,
1464 struct label *pplabel)
1465{
1466 struct mac_biba *subj, *obj;
1467
1468 if (!biba_enabled)
1469 return (0);
1470
1471 subj = SLOT(cred->cr_label);
1472 obj = SLOT(pplabel);
1473
1474 if (!biba_dominate_effective(obj, subj))
1475 return (EACCES);
1476
1477 return (0);
1478}
1479
1480static int
1481biba_pipe_check_read(struct ucred *cred, struct pipepair *pp,
1482 struct label *pplabel)
1483{
1484 struct mac_biba *subj, *obj;
1485
1486 if (!biba_enabled)
1487 return (0);
1488
1489 subj = SLOT(cred->cr_label);
1490 obj = SLOT(pplabel);
1491
1492 if (!biba_dominate_effective(obj, subj))
1493 return (EACCES);
1494
1495 return (0);
1496}
1497
1498static int
1499biba_pipe_check_relabel(struct ucred *cred, struct pipepair *pp,
1500 struct label *pplabel, struct label *newlabel)
1501{
1502 struct mac_biba *subj, *obj, *new;
1503 int error;
1504
1505 new = SLOT(newlabel);
1506 subj = SLOT(cred->cr_label);
1507 obj = SLOT(pplabel);
1508
1509 /*
1510 * If there is a Biba label update for a pipe, it must be a effective
1511 * update.
1512 */
1513 error = biba_atmostflags(new, MAC_BIBA_FLAG_EFFECTIVE);
1514 if (error)
1515 return (error);
1516
1517 /*
1518 * To perform a relabel of a pipe (Biba label or not), Biba must
1519 * authorize the relabel.
1520 */
1521 if (!biba_effective_in_range(obj, subj))
1522 return (EPERM);
1523
1524 /*
1525 * If the Biba label is to be changed, authorize as appropriate.
1526 */
1527 if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) {
1528 /*
1529 * To change the Biba label on a pipe, the new pipe label
1530 * must be in the subject range.
1531 */
1532 if (!biba_effective_in_range(new, subj))
1533 return (EPERM);
1534
1535 /*
1536 * To change the Biba label on a pipe to be EQUAL, the
1537 * subject must have appropriate privilege.
1538 */
1539 if (biba_contains_equal(new)) {
1540 error = biba_subject_privileged(subj);
1541 if (error)
1542 return (error);
1543 }
1544 }
1545
1546 return (0);
1547}
1548
1549static int
1550biba_pipe_check_stat(struct ucred *cred, struct pipepair *pp,
1551 struct label *pplabel)
1552{
1553 struct mac_biba *subj, *obj;
1554
1555 if (!biba_enabled)
1556 return (0);
1557
1558 subj = SLOT(cred->cr_label);
1559 obj = SLOT(pplabel);
1560
1561 if (!biba_dominate_effective(obj, subj))
1562 return (EACCES);
1563
1564 return (0);
1565}
1566
1567static int
1568biba_pipe_check_write(struct ucred *cred, struct pipepair *pp,
1569 struct label *pplabel)
1570{
1571 struct mac_biba *subj, *obj;
1572
1573 if (!biba_enabled)
1574 return (0);
1575
1576 subj = SLOT(cred->cr_label);
1577 obj = SLOT(pplabel);
1578
1579 if (!biba_dominate_effective(subj, obj))
1580 return (EACCES);
1581
1582 return (0);
1583}
1584
1585static void
1586biba_pipe_create(struct ucred *cred, struct pipepair *pp,
1587 struct label *pplabel)
1588{
1589 struct mac_biba *source, *dest;
1590
1591 source = SLOT(cred->cr_label);
1592 dest = SLOT(pplabel);
1593
1594 biba_copy_effective(source, dest);
1595}
1596
1597static void
1598biba_pipe_relabel(struct ucred *cred, struct pipepair *pp,
1599 struct label *pplabel, struct label *newlabel)
1600{
1601 struct mac_biba *source, *dest;
1602
1603 source = SLOT(newlabel);
1604 dest = SLOT(pplabel);
1605
1606 biba_copy(source, dest);
1607}
1608
1609static int
1610biba_posixsem_check_openunlink(struct ucred *cred, struct ksem *ks,
1611 struct label *kslabel)
1612{
1613 struct mac_biba *subj, *obj;
1614
1615 if (!biba_enabled)
1616 return (0);
1617
1618 subj = SLOT(cred->cr_label);
1619 obj = SLOT(kslabel);
1620
1621 if (!biba_dominate_effective(subj, obj))
1622 return (EACCES);
1623
1624 return (0);
1625}
1626
1627static int
|
| 1628biba_posixsem_check_setmode(struct ucred *cred, struct ksem *ks,
1629 struct label *kslabel, mode_t mode)
1630{
1631 struct mac_biba *subj, *obj;
1632
1633 if (!biba_enabled)
1634 return (0);
1635
1636 subj = SLOT(cred->cr_label);
1637 obj = SLOT(kslabel);
1638
1639 if (!biba_dominate_effective(subj, obj))
1640 return (EACCES);
1641
1642 return (0);
1643}
1644
1645static int
1646biba_posixsem_check_setowner(struct ucred *cred, struct ksem *ks,
1647 struct label *kslabel, uid_t uid, gid_t gid)
1648{
1649 struct mac_biba *subj, *obj;
1650
1651 if (!biba_enabled)
1652 return (0);
1653
1654 subj = SLOT(cred->cr_label);
1655 obj = SLOT(kslabel);
1656
1657 if (!biba_dominate_effective(subj, obj))
1658 return (EACCES);
1659
1660 return (0);
1661}
1662
1663static int
|
1625biba_posixsem_check_write(struct ucred *active_cred, struct ucred *file_cred,
1626 struct ksem *ks, struct label *kslabel)
1627{
1628 struct mac_biba *subj, *obj;
1629
1630 if (!biba_enabled)
1631 return (0);
1632
1633 subj = SLOT(active_cred->cr_label);
1634 obj = SLOT(kslabel);
1635
1636 if (!biba_dominate_effective(subj, obj))
1637 return (EACCES);
1638
1639 return (0);
1640}
1641
1642static int
1643biba_posixsem_check_rdonly(struct ucred *active_cred, struct ucred *file_cred,
1644 struct ksem *ks, struct label *kslabel)
1645{
1646 struct mac_biba *subj, *obj;
1647
1648 if (!biba_enabled)
1649 return (0);
1650
1651 subj = SLOT(active_cred->cr_label);
1652 obj = SLOT(kslabel);
1653
1654 if (!biba_dominate_effective(obj, subj))
1655 return (EACCES);
1656
1657 return (0);
1658}
1659
1660static void
1661biba_posixsem_create(struct ucred *cred, struct ksem *ks,
1662 struct label *kslabel)
1663{
1664 struct mac_biba *source, *dest;
1665
1666 source = SLOT(cred->cr_label);
1667 dest = SLOT(kslabel);
1668
1669 biba_copy_effective(source, dest);
1670}
1671
| 1664biba_posixsem_check_write(struct ucred *active_cred, struct ucred *file_cred,
1665 struct ksem *ks, struct label *kslabel)
1666{
1667 struct mac_biba *subj, *obj;
1668
1669 if (!biba_enabled)
1670 return (0);
1671
1672 subj = SLOT(active_cred->cr_label);
1673 obj = SLOT(kslabel);
1674
1675 if (!biba_dominate_effective(subj, obj))
1676 return (EACCES);
1677
1678 return (0);
1679}
1680
1681static int
1682biba_posixsem_check_rdonly(struct ucred *active_cred, struct ucred *file_cred,
1683 struct ksem *ks, struct label *kslabel)
1684{
1685 struct mac_biba *subj, *obj;
1686
1687 if (!biba_enabled)
1688 return (0);
1689
1690 subj = SLOT(active_cred->cr_label);
1691 obj = SLOT(kslabel);
1692
1693 if (!biba_dominate_effective(obj, subj))
1694 return (EACCES);
1695
1696 return (0);
1697}
1698
1699static void
1700biba_posixsem_create(struct ucred *cred, struct ksem *ks,
1701 struct label *kslabel)
1702{
1703 struct mac_biba *source, *dest;
1704
1705 source = SLOT(cred->cr_label);
1706 dest = SLOT(kslabel);
1707
1708 biba_copy_effective(source, dest);
1709}
1710
|
| 1711static int
1712biba_posixshm_check_mmap(struct ucred *cred, struct shmfd *shmfd,
1713 struct label *shmlabel, int prot, int flags)
1714{
1715 struct mac_biba *subj, *obj;
1716
1717 if (!biba_enabled || !revocation_enabled)
1718 return (0);
1719
1720 subj = SLOT(cred->cr_label);
1721 obj = SLOT(shmlabel);
1722
1723 if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) {
1724 if (!biba_dominate_effective(obj, subj))
1725 return (EACCES);
1726 }
1727 if (((prot & VM_PROT_WRITE) != 0) && ((flags & MAP_SHARED) != 0)) {
1728 if (!biba_dominate_effective(subj, obj))
1729 return (EACCES);
1730 }
1731
1732 return (0);
1733}
1734
1735static int
1736biba_posixshm_check_open(struct ucred *cred, struct shmfd *shmfd,
1737 struct label *shmlabel, accmode_t accmode)
1738{
1739 struct mac_biba *subj, *obj;
1740
1741 if (!biba_enabled)
1742 return (0);
1743
1744 subj = SLOT(cred->cr_label);
1745 obj = SLOT(shmlabel);
1746
1747 if (accmode & (VREAD | VEXEC | VSTAT_PERMS)) {
1748 if (!biba_dominate_effective(obj, subj))
1749 return (EACCES);
1750 }
1751 if (accmode & VMODIFY_PERMS) {
1752 if (!biba_dominate_effective(subj, obj))
1753 return (EACCES);
1754 }
1755
1756 return (0);
1757}
1758
1759static int
1760biba_posixshm_check_setmode(struct ucred *cred, struct shmfd *shmfd,
1761 struct label *shmlabel, mode_t mode)
1762{
1763 struct mac_biba *subj, *obj;
1764
1765 if (!biba_enabled)
1766 return (0);
1767
1768 subj = SLOT(cred->cr_label);
1769 obj = SLOT(shmlabel);
1770
1771 if (!biba_dominate_effective(subj, obj))
1772 return (EACCES);
1773
1774 return (0);
1775}
1776
1777static int
1778biba_posixshm_check_setowner(struct ucred *cred, struct shmfd *shmfd,
1779 struct label *shmlabel, uid_t uid, gid_t gid)
1780{
1781 struct mac_biba *subj, *obj;
1782
1783 if (!biba_enabled)
1784 return (0);
1785
1786 subj = SLOT(cred->cr_label);
1787 obj = SLOT(shmlabel);
1788
1789 if (!biba_dominate_effective(subj, obj))
1790 return (EACCES);
1791
1792 return (0);
1793}
1794
1795static int
1796biba_posixshm_check_stat(struct ucred *active_cred, struct ucred *file_cred,
1797 struct shmfd *shmfd, struct label *shmlabel)
1798{
1799 struct mac_biba *subj, *obj;
1800
1801 if (!biba_enabled)
1802 return (0);
1803
1804 subj = SLOT(active_cred->cr_label);
1805 obj = SLOT(shmlabel);
1806
1807 if (!biba_dominate_effective(obj, subj))
1808 return (EACCES);
1809
1810 return (0);
1811}
1812
1813static int
1814biba_posixshm_check_truncate(struct ucred *active_cred,
1815 struct ucred *file_cred, struct shmfd *shmfd, struct label *shmlabel)
1816{
1817 struct mac_biba *subj, *obj;
1818
1819 if (!biba_enabled)
1820 return (0);
1821
1822 subj = SLOT(active_cred->cr_label);
1823 obj = SLOT(shmlabel);
1824
1825 if (!biba_dominate_effective(subj, obj))
1826 return (EACCES);
1827
1828 return (0);
1829}
1830
1831static int
1832biba_posixshm_check_unlink(struct ucred *cred, struct shmfd *shmfd,
1833 struct label *shmlabel)
1834{
1835 struct mac_biba *subj, *obj;
1836
1837 if (!biba_enabled)
1838 return (0);
1839
1840 subj = SLOT(cred->cr_label);
1841 obj = SLOT(shmlabel);
1842
1843 if (!biba_dominate_effective(subj, obj))
1844 return (EACCES);
1845
1846 return (0);
1847}
1848
1849static void
1850biba_posixshm_create(struct ucred *cred, struct shmfd *shmfd,
1851 struct label *shmlabel)
1852{
1853 struct mac_biba *source, *dest;
1854
1855 source = SLOT(cred->cr_label);
1856 dest = SLOT(shmlabel);
1857
1858 biba_copy_effective(source, dest);
1859}
1860
|
1672/*
1673 * Some system privileges are allowed regardless of integrity grade; others
1674 * are allowed only when running with privilege with respect to the Biba
1675 * policy as they might otherwise allow bypassing of the integrity policy.
1676 */
1677static int
1678biba_priv_check(struct ucred *cred, int priv)
1679{
1680 struct mac_biba *subj;
1681 int error;
1682
1683 if (!biba_enabled)
1684 return (0);
1685
1686 /*
1687 * Exempt only specific privileges from the Biba integrity policy.
1688 */
1689 switch (priv) {
1690 case PRIV_KTRACE:
1691 case PRIV_MSGBUF:
1692
1693 /*
1694 * Allow processes to manipulate basic process audit properties, and
1695 * to submit audit records.
1696 */
1697 case PRIV_AUDIT_GETAUDIT:
1698 case PRIV_AUDIT_SETAUDIT:
1699 case PRIV_AUDIT_SUBMIT:
1700
1701 /*
1702 * Allow processes to manipulate their regular UNIX credentials.
1703 */
1704 case PRIV_CRED_SETUID:
1705 case PRIV_CRED_SETEUID:
1706 case PRIV_CRED_SETGID:
1707 case PRIV_CRED_SETEGID:
1708 case PRIV_CRED_SETGROUPS:
1709 case PRIV_CRED_SETREUID:
1710 case PRIV_CRED_SETREGID:
1711 case PRIV_CRED_SETRESUID:
1712 case PRIV_CRED_SETRESGID:
1713
1714 /*
1715 * Allow processes to perform system monitoring.
1716 */
1717 case PRIV_SEEOTHERGIDS:
1718 case PRIV_SEEOTHERUIDS:
1719 break;
1720
1721 /*
1722 * Allow access to general process debugging facilities. We
1723 * separately control debugging based on MAC label.
1724 */
1725 case PRIV_DEBUG_DIFFCRED:
1726 case PRIV_DEBUG_SUGID:
1727 case PRIV_DEBUG_UNPRIV:
1728
1729 /*
1730 * Allow manipulating jails.
1731 */
1732 case PRIV_JAIL_ATTACH:
1733
1734 /*
1735 * Allow privilege with respect to the Partition policy, but not the
1736 * Privs policy.
1737 */
1738 case PRIV_MAC_PARTITION:
1739
1740 /*
1741 * Allow privilege with respect to process resource limits and login
1742 * context.
1743 */
1744 case PRIV_PROC_LIMIT:
1745 case PRIV_PROC_SETLOGIN:
1746 case PRIV_PROC_SETRLIMIT:
1747
1748 /*
1749 * Allow System V and POSIX IPC privileges.
1750 */
1751 case PRIV_IPC_READ:
1752 case PRIV_IPC_WRITE:
1753 case PRIV_IPC_ADMIN:
1754 case PRIV_IPC_MSGSIZE:
1755 case PRIV_MQ_ADMIN:
1756
1757 /*
1758 * Allow certain scheduler manipulations -- possibly this should be
1759 * controlled by more fine-grained policy, as potentially low
1760 * integrity processes can deny CPU to higher integrity ones.
1761 */
1762 case PRIV_SCHED_DIFFCRED:
1763 case PRIV_SCHED_SETPRIORITY:
1764 case PRIV_SCHED_RTPRIO:
1765 case PRIV_SCHED_SETPOLICY:
1766 case PRIV_SCHED_SET:
1767 case PRIV_SCHED_SETPARAM:
1768
1769 /*
1770 * More IPC privileges.
1771 */
1772 case PRIV_SEM_WRITE:
1773
1774 /*
1775 * Allow signaling privileges subject to integrity policy.
1776 */
1777 case PRIV_SIGNAL_DIFFCRED:
1778 case PRIV_SIGNAL_SUGID:
1779
1780 /*
1781 * Allow access to only limited sysctls from lower integrity levels;
1782 * piggy-back on the Jail definition.
1783 */
1784 case PRIV_SYSCTL_WRITEJAIL:
1785
1786 /*
1787 * Allow TTY-based privileges, subject to general device access using
1788 * labels on TTY device nodes, but not console privilege.
1789 */
1790 case PRIV_TTY_DRAINWAIT:
1791 case PRIV_TTY_DTRWAIT:
1792 case PRIV_TTY_EXCLUSIVE:
1793 case PRIV_TTY_STI:
1794 case PRIV_TTY_SETA:
1795
1796 /*
1797 * Grant most VFS privileges, as almost all are in practice bounded
1798 * by more specific checks using labels.
1799 */
1800 case PRIV_VFS_READ:
1801 case PRIV_VFS_WRITE:
1802 case PRIV_VFS_ADMIN:
1803 case PRIV_VFS_EXEC:
1804 case PRIV_VFS_LOOKUP:
1805 case PRIV_VFS_CHFLAGS_DEV:
1806 case PRIV_VFS_CHOWN:
1807 case PRIV_VFS_CHROOT:
1808 case PRIV_VFS_RETAINSUGID:
1809 case PRIV_VFS_EXCEEDQUOTA:
1810 case PRIV_VFS_FCHROOT:
1811 case PRIV_VFS_FHOPEN:
1812 case PRIV_VFS_FHSTATFS:
1813 case PRIV_VFS_GENERATION:
1814 case PRIV_VFS_GETFH:
1815 case PRIV_VFS_GETQUOTA:
1816 case PRIV_VFS_LINK:
1817 case PRIV_VFS_MOUNT:
1818 case PRIV_VFS_MOUNT_OWNER:
1819 case PRIV_VFS_MOUNT_PERM:
1820 case PRIV_VFS_MOUNT_SUIDDIR:
1821 case PRIV_VFS_MOUNT_NONUSER:
1822 case PRIV_VFS_SETGID:
1823 case PRIV_VFS_STICKYFILE:
1824 case PRIV_VFS_SYSFLAGS:
1825 case PRIV_VFS_UNMOUNT:
1826
1827 /*
1828 * Allow VM privileges; it would be nice if these were subject to
1829 * resource limits.
1830 */
1831 case PRIV_VM_MADV_PROTECT:
1832 case PRIV_VM_MLOCK:
1833 case PRIV_VM_MUNLOCK:
1834 case PRIV_VM_SWAP_NOQUOTA:
1835 case PRIV_VM_SWAP_NORLIMIT:
1836
1837 /*
1838 * Allow some but not all network privileges. In general, dont allow
1839 * reconfiguring the network stack, just normal use.
1840 */
1841 case PRIV_NETATALK_RESERVEDPORT:
1842 case PRIV_NETINET_RESERVEDPORT:
1843 case PRIV_NETINET_RAW:
1844 case PRIV_NETINET_REUSEPORT:
1845 case PRIV_NETIPX_RESERVEDPORT:
1846 case PRIV_NETIPX_RAW:
1847 break;
1848
1849 /*
1850 * All remaining system privileges are allow only if the process
1851 * holds privilege with respect to the Biba policy.
1852 */
1853 default:
1854 subj = SLOT(cred->cr_label);
1855 error = biba_subject_privileged(subj);
1856 if (error)
1857 return (error);
1858 }
1859 return (0);
1860}
1861
1862static int
1863biba_proc_check_debug(struct ucred *cred, struct proc *p)
1864{
1865 struct mac_biba *subj, *obj;
1866
1867 if (!biba_enabled)
1868 return (0);
1869
1870 subj = SLOT(cred->cr_label);
1871 obj = SLOT(p->p_ucred->cr_label);
1872
1873 /* XXX: range checks */
1874 if (!biba_dominate_effective(obj, subj))
1875 return (ESRCH);
1876 if (!biba_dominate_effective(subj, obj))
1877 return (EACCES);
1878
1879 return (0);
1880}
1881
1882static int
1883biba_proc_check_sched(struct ucred *cred, struct proc *p)
1884{
1885 struct mac_biba *subj, *obj;
1886
1887 if (!biba_enabled)
1888 return (0);
1889
1890 subj = SLOT(cred->cr_label);
1891 obj = SLOT(p->p_ucred->cr_label);
1892
1893 /* XXX: range checks */
1894 if (!biba_dominate_effective(obj, subj))
1895 return (ESRCH);
1896 if (!biba_dominate_effective(subj, obj))
1897 return (EACCES);
1898
1899 return (0);
1900}
1901
1902static int
1903biba_proc_check_signal(struct ucred *cred, struct proc *p, int signum)
1904{
1905 struct mac_biba *subj, *obj;
1906
1907 if (!biba_enabled)
1908 return (0);
1909
1910 subj = SLOT(cred->cr_label);
1911 obj = SLOT(p->p_ucred->cr_label);
1912
1913 /* XXX: range checks */
1914 if (!biba_dominate_effective(obj, subj))
1915 return (ESRCH);
1916 if (!biba_dominate_effective(subj, obj))
1917 return (EACCES);
1918
1919 return (0);
1920}
1921
1922static int
1923biba_socket_check_deliver(struct socket *so, struct label *solabel,
1924 struct mbuf *m, struct label *mlabel)
1925{
1926 struct mac_biba *p, *s;
1927 int error;
1928
1929 if (!biba_enabled)
1930 return (0);
1931
1932 p = SLOT(mlabel);
1933 s = SLOT(solabel);
1934
1935 SOCK_LOCK(so);
1936 error = biba_equal_effective(p, s) ? 0 : EACCES;
1937 SOCK_UNLOCK(so);
1938 return (error);
1939}
1940
1941static int
1942biba_socket_check_relabel(struct ucred *cred, struct socket *so,
1943 struct label *solabel, struct label *newlabel)
1944{
1945 struct mac_biba *subj, *obj, *new;
1946 int error;
1947
1948 SOCK_LOCK_ASSERT(so);
1949
1950 new = SLOT(newlabel);
1951 subj = SLOT(cred->cr_label);
1952 obj = SLOT(solabel);
1953
1954 /*
1955 * If there is a Biba label update for the socket, it may be an
1956 * update of effective.
1957 */
1958 error = biba_atmostflags(new, MAC_BIBA_FLAG_EFFECTIVE);
1959 if (error)
1960 return (error);
1961
1962 /*
1963 * To relabel a socket, the old socket effective must be in the
1964 * subject range.
1965 */
1966 if (!biba_effective_in_range(obj, subj))
1967 return (EPERM);
1968
1969 /*
1970 * If the Biba label is to be changed, authorize as appropriate.
1971 */
1972 if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) {
1973 /*
1974 * To relabel a socket, the new socket effective must be in
1975 * the subject range.
1976 */
1977 if (!biba_effective_in_range(new, subj))
1978 return (EPERM);
1979
1980 /*
1981 * To change the Biba label on the socket to contain EQUAL,
1982 * the subject must have appropriate privilege.
1983 */
1984 if (biba_contains_equal(new)) {
1985 error = biba_subject_privileged(subj);
1986 if (error)
1987 return (error);
1988 }
1989 }
1990
1991 return (0);
1992}
1993
1994static int
1995biba_socket_check_visible(struct ucred *cred, struct socket *so,
1996 struct label *solabel)
1997{
1998 struct mac_biba *subj, *obj;
1999
2000 if (!biba_enabled)
2001 return (0);
2002
2003 subj = SLOT(cred->cr_label);
2004 obj = SLOT(solabel);
2005
2006 SOCK_LOCK(so);
2007 if (!biba_dominate_effective(obj, subj)) {
2008 SOCK_UNLOCK(so);
2009 return (ENOENT);
2010 }
2011 SOCK_UNLOCK(so);
2012
2013 return (0);
2014}
2015
2016static void
2017biba_socket_create(struct ucred *cred, struct socket *so,
2018 struct label *solabel)
2019{
2020 struct mac_biba *source, *dest;
2021
2022 source = SLOT(cred->cr_label);
2023 dest = SLOT(solabel);
2024
2025 biba_copy_effective(source, dest);
2026}
2027
2028static void
2029biba_socket_create_mbuf(struct socket *so, struct label *solabel,
2030 struct mbuf *m, struct label *mlabel)
2031{
2032 struct mac_biba *source, *dest;
2033
2034 source = SLOT(solabel);
2035 dest = SLOT(mlabel);
2036
2037 SOCK_LOCK(so);
2038 biba_copy_effective(source, dest);
2039 SOCK_UNLOCK(so);
2040}
2041
2042static void
2043biba_socket_newconn(struct socket *oldso, struct label *oldsolabel,
2044 struct socket *newso, struct label *newsolabel)
2045{
2046 struct mac_biba source, *dest;
2047
2048 SOCK_LOCK(oldso);
2049 source = *SLOT(oldsolabel);
2050 SOCK_UNLOCK(oldso);
2051
2052 dest = SLOT(newsolabel);
2053
2054 SOCK_LOCK(newso);
2055 biba_copy_effective(&source, dest);
2056 SOCK_UNLOCK(newso);
2057}
2058
2059static void
2060biba_socket_relabel(struct ucred *cred, struct socket *so,
2061 struct label *solabel, struct label *newlabel)
2062{
2063 struct mac_biba *source, *dest;
2064
2065 SOCK_LOCK_ASSERT(so);
2066
2067 source = SLOT(newlabel);
2068 dest = SLOT(solabel);
2069
2070 biba_copy(source, dest);
2071}
2072
2073static void
2074biba_socketpeer_set_from_mbuf(struct mbuf *m, struct label *mlabel,
2075 struct socket *so, struct label *sopeerlabel)
2076{
2077 struct mac_biba *source, *dest;
2078
2079 source = SLOT(mlabel);
2080 dest = SLOT(sopeerlabel);
2081
2082 SOCK_LOCK(so);
2083 biba_copy_effective(source, dest);
2084 SOCK_UNLOCK(so);
2085}
2086
2087static void
2088biba_socketpeer_set_from_socket(struct socket *oldso,
2089 struct label *oldsolabel, struct socket *newso,
2090 struct label *newsopeerlabel)
2091{
2092 struct mac_biba source, *dest;
2093
2094 SOCK_LOCK(oldso);
2095 source = *SLOT(oldsolabel);
2096 SOCK_UNLOCK(oldso);
2097 dest = SLOT(newsopeerlabel);
2098
2099 SOCK_LOCK(newso);
2100 biba_copy_effective(&source, dest);
2101 SOCK_UNLOCK(newso);
2102}
2103
2104static void
2105biba_syncache_create(struct label *label, struct inpcb *inp)
2106{
2107 struct mac_biba *source, *dest;
2108
2109 source = SLOT(inp->inp_label);
2110 dest = SLOT(label);
2111 biba_copy_effective(source, dest);
2112}
2113
2114static void
2115biba_syncache_create_mbuf(struct label *sc_label, struct mbuf *m,
2116 struct label *mlabel)
2117{
2118 struct mac_biba *source, *dest;
2119
2120 source = SLOT(sc_label);
2121 dest = SLOT(mlabel);
2122 biba_copy_effective(source, dest);
2123}
2124
2125static int
2126biba_system_check_acct(struct ucred *cred, struct vnode *vp,
2127 struct label *vplabel)
2128{
2129 struct mac_biba *subj, *obj;
2130 int error;
2131
2132 if (!biba_enabled)
2133 return (0);
2134
2135 subj = SLOT(cred->cr_label);
2136
2137 error = biba_subject_privileged(subj);
2138 if (error)
2139 return (error);
2140
2141 if (vplabel == NULL)
2142 return (0);
2143
2144 obj = SLOT(vplabel);
2145 if (!biba_high_effective(obj))
2146 return (EACCES);
2147
2148 return (0);
2149}
2150
2151static int
2152biba_system_check_auditctl(struct ucred *cred, struct vnode *vp,
2153 struct label *vplabel)
2154{
2155 struct mac_biba *subj, *obj;
2156 int error;
2157
2158 if (!biba_enabled)
2159 return (0);
2160
2161 subj = SLOT(cred->cr_label);
2162
2163 error = biba_subject_privileged(subj);
2164 if (error)
2165 return (error);
2166
2167 if (vplabel == NULL)
2168 return (0);
2169
2170 obj = SLOT(vplabel);
2171 if (!biba_high_effective(obj))
2172 return (EACCES);
2173
2174 return (0);
2175}
2176
2177static int
2178biba_system_check_auditon(struct ucred *cred, int cmd)
2179{
2180 struct mac_biba *subj;
2181 int error;
2182
2183 if (!biba_enabled)
2184 return (0);
2185
2186 subj = SLOT(cred->cr_label);
2187
2188 error = biba_subject_privileged(subj);
2189 if (error)
2190 return (error);
2191
2192 return (0);
2193}
2194
2195static int
2196biba_system_check_swapoff(struct ucred *cred, struct vnode *vp,
2197 struct label *label)
2198{
2199 struct mac_biba *subj;
2200 int error;
2201
2202 if (!biba_enabled)
2203 return (0);
2204
2205 subj = SLOT(cred->cr_label);
2206
2207 error = biba_subject_privileged(subj);
2208 if (error)
2209 return (error);
2210
2211 return (0);
2212}
2213
2214static int
2215biba_system_check_swapon(struct ucred *cred, struct vnode *vp,
2216 struct label *vplabel)
2217{
2218 struct mac_biba *subj, *obj;
2219 int error;
2220
2221 if (!biba_enabled)
2222 return (0);
2223
2224 subj = SLOT(cred->cr_label);
2225 obj = SLOT(vplabel);
2226
2227 error = biba_subject_privileged(subj);
2228 if (error)
2229 return (error);
2230
2231 if (!biba_high_effective(obj))
2232 return (EACCES);
2233
2234 return (0);
2235}
2236
2237static int
2238biba_system_check_sysctl(struct ucred *cred, struct sysctl_oid *oidp,
2239 void *arg1, int arg2, struct sysctl_req *req)
2240{
2241 struct mac_biba *subj;
2242 int error;
2243
2244 if (!biba_enabled)
2245 return (0);
2246
2247 subj = SLOT(cred->cr_label);
2248
2249 /*
2250 * Treat sysctl variables without CTLFLAG_ANYBODY flag as biba/high,
2251 * but also require privilege to change them.
2252 */
2253 if (req->newptr != NULL && (oidp->oid_kind & CTLFLAG_ANYBODY) == 0) {
2254 if (!biba_subject_dominate_high(subj))
2255 return (EACCES);
2256
2257 error = biba_subject_privileged(subj);
2258 if (error)
2259 return (error);
2260 }
2261
2262 return (0);
2263}
2264
2265static void
2266biba_sysvmsg_cleanup(struct label *msglabel)
2267{
2268
2269 bzero(SLOT(msglabel), sizeof(struct mac_biba));
2270}
2271
2272static void
2273biba_sysvmsg_create(struct ucred *cred, struct msqid_kernel *msqkptr,
2274 struct label *msqlabel, struct msg *msgptr, struct label *msglabel)
2275{
2276 struct mac_biba *source, *dest;
2277
2278 /* Ignore the msgq label */
2279 source = SLOT(cred->cr_label);
2280 dest = SLOT(msglabel);
2281
2282 biba_copy_effective(source, dest);
2283}
2284
2285static int
2286biba_sysvmsq_check_msgrcv(struct ucred *cred, struct msg *msgptr,
2287 struct label *msglabel)
2288{
2289 struct mac_biba *subj, *obj;
2290
2291 if (!biba_enabled)
2292 return (0);
2293
2294 subj = SLOT(cred->cr_label);
2295 obj = SLOT(msglabel);
2296
2297 if (!biba_dominate_effective(obj, subj))
2298 return (EACCES);
2299
2300 return (0);
2301}
2302
2303static int
2304biba_sysvmsq_check_msgrmid(struct ucred *cred, struct msg *msgptr,
2305 struct label *msglabel)
2306{
2307 struct mac_biba *subj, *obj;
2308
2309 if (!biba_enabled)
2310 return (0);
2311
2312 subj = SLOT(cred->cr_label);
2313 obj = SLOT(msglabel);
2314
2315 if (!biba_dominate_effective(subj, obj))
2316 return (EACCES);
2317
2318 return (0);
2319}
2320
2321static int
2322biba_sysvmsq_check_msqget(struct ucred *cred, struct msqid_kernel *msqkptr,
2323 struct label *msqklabel)
2324{
2325 struct mac_biba *subj, *obj;
2326
2327 if (!biba_enabled)
2328 return (0);
2329
2330 subj = SLOT(cred->cr_label);
2331 obj = SLOT(msqklabel);
2332
2333 if (!biba_dominate_effective(obj, subj))
2334 return (EACCES);
2335
2336 return (0);
2337}
2338
2339static int
2340biba_sysvmsq_check_msqsnd(struct ucred *cred, struct msqid_kernel *msqkptr,
2341 struct label *msqklabel)
2342{
2343 struct mac_biba *subj, *obj;
2344
2345 if (!biba_enabled)
2346 return (0);
2347
2348 subj = SLOT(cred->cr_label);
2349 obj = SLOT(msqklabel);
2350
2351 if (!biba_dominate_effective(subj, obj))
2352 return (EACCES);
2353
2354 return (0);
2355}
2356
2357static int
2358biba_sysvmsq_check_msqrcv(struct ucred *cred, struct msqid_kernel *msqkptr,
2359 struct label *msqklabel)
2360{
2361 struct mac_biba *subj, *obj;
2362
2363 if (!biba_enabled)
2364 return (0);
2365
2366 subj = SLOT(cred->cr_label);
2367 obj = SLOT(msqklabel);
2368
2369 if (!biba_dominate_effective(obj, subj))
2370 return (EACCES);
2371
2372 return (0);
2373}
2374
2375static int
2376biba_sysvmsq_check_msqctl(struct ucred *cred, struct msqid_kernel *msqkptr,
2377 struct label *msqklabel, int cmd)
2378{
2379 struct mac_biba *subj, *obj;
2380
2381 if (!biba_enabled)
2382 return (0);
2383
2384 subj = SLOT(cred->cr_label);
2385 obj = SLOT(msqklabel);
2386
2387 switch(cmd) {
2388 case IPC_RMID:
2389 case IPC_SET:
2390 if (!biba_dominate_effective(subj, obj))
2391 return (EACCES);
2392 break;
2393
2394 case IPC_STAT:
2395 if (!biba_dominate_effective(obj, subj))
2396 return (EACCES);
2397 break;
2398
2399 default:
2400 return (EACCES);
2401 }
2402
2403 return (0);
2404}
2405
2406static void
2407biba_sysvmsq_cleanup(struct label *msqlabel)
2408{
2409
2410 bzero(SLOT(msqlabel), sizeof(struct mac_biba));
2411}
2412
2413static void
2414biba_sysvmsq_create(struct ucred *cred, struct msqid_kernel *msqkptr,
2415 struct label *msqlabel)
2416{
2417 struct mac_biba *source, *dest;
2418
2419 source = SLOT(cred->cr_label);
2420 dest = SLOT(msqlabel);
2421
2422 biba_copy_effective(source, dest);
2423}
2424
2425static int
2426biba_sysvsem_check_semctl(struct ucred *cred, struct semid_kernel *semakptr,
2427 struct label *semaklabel, int cmd)
2428{
2429 struct mac_biba *subj, *obj;
2430
2431 if (!biba_enabled)
2432 return (0);
2433
2434 subj = SLOT(cred->cr_label);
2435 obj = SLOT(semaklabel);
2436
2437 switch(cmd) {
2438 case IPC_RMID:
2439 case IPC_SET:
2440 case SETVAL:
2441 case SETALL:
2442 if (!biba_dominate_effective(subj, obj))
2443 return (EACCES);
2444 break;
2445
2446 case IPC_STAT:
2447 case GETVAL:
2448 case GETPID:
2449 case GETNCNT:
2450 case GETZCNT:
2451 case GETALL:
2452 if (!biba_dominate_effective(obj, subj))
2453 return (EACCES);
2454 break;
2455
2456 default:
2457 return (EACCES);
2458 }
2459
2460 return (0);
2461}
2462
2463static int
2464biba_sysvsem_check_semget(struct ucred *cred, struct semid_kernel *semakptr,
2465 struct label *semaklabel)
2466{
2467 struct mac_biba *subj, *obj;
2468
2469 if (!biba_enabled)
2470 return (0);
2471
2472 subj = SLOT(cred->cr_label);
2473 obj = SLOT(semaklabel);
2474
2475 if (!biba_dominate_effective(obj, subj))
2476 return (EACCES);
2477
2478 return (0);
2479}
2480
2481static int
2482biba_sysvsem_check_semop(struct ucred *cred, struct semid_kernel *semakptr,
2483 struct label *semaklabel, size_t accesstype)
2484{
2485 struct mac_biba *subj, *obj;
2486
2487 if (!biba_enabled)
2488 return (0);
2489
2490 subj = SLOT(cred->cr_label);
2491 obj = SLOT(semaklabel);
2492
2493 if (accesstype & SEM_R)
2494 if (!biba_dominate_effective(obj, subj))
2495 return (EACCES);
2496
2497 if (accesstype & SEM_A)
2498 if (!biba_dominate_effective(subj, obj))
2499 return (EACCES);
2500
2501 return (0);
2502}
2503
2504static void
2505biba_sysvsem_cleanup(struct label *semalabel)
2506{
2507
2508 bzero(SLOT(semalabel), sizeof(struct mac_biba));
2509}
2510
2511static void
2512biba_sysvsem_create(struct ucred *cred, struct semid_kernel *semakptr,
2513 struct label *semalabel)
2514{
2515 struct mac_biba *source, *dest;
2516
2517 source = SLOT(cred->cr_label);
2518 dest = SLOT(semalabel);
2519
2520 biba_copy_effective(source, dest);
2521}
2522
2523static int
2524biba_sysvshm_check_shmat(struct ucred *cred, struct shmid_kernel *shmsegptr,
2525 struct label *shmseglabel, int shmflg)
2526{
2527 struct mac_biba *subj, *obj;
2528
2529 if (!biba_enabled)
2530 return (0);
2531
2532 subj = SLOT(cred->cr_label);
2533 obj = SLOT(shmseglabel);
2534
2535 if (!biba_dominate_effective(obj, subj))
2536 return (EACCES);
2537 if ((shmflg & SHM_RDONLY) == 0) {
2538 if (!biba_dominate_effective(subj, obj))
2539 return (EACCES);
2540 }
2541
2542 return (0);
2543}
2544
2545static int
2546biba_sysvshm_check_shmctl(struct ucred *cred, struct shmid_kernel *shmsegptr,
2547 struct label *shmseglabel, int cmd)
2548{
2549 struct mac_biba *subj, *obj;
2550
2551 if (!biba_enabled)
2552 return (0);
2553
2554 subj = SLOT(cred->cr_label);
2555 obj = SLOT(shmseglabel);
2556
2557 switch(cmd) {
2558 case IPC_RMID:
2559 case IPC_SET:
2560 if (!biba_dominate_effective(subj, obj))
2561 return (EACCES);
2562 break;
2563
2564 case IPC_STAT:
2565 case SHM_STAT:
2566 if (!biba_dominate_effective(obj, subj))
2567 return (EACCES);
2568 break;
2569
2570 default:
2571 return (EACCES);
2572 }
2573
2574 return (0);
2575}
2576
2577static int
2578biba_sysvshm_check_shmget(struct ucred *cred, struct shmid_kernel *shmsegptr,
2579 struct label *shmseglabel, int shmflg)
2580{
2581 struct mac_biba *subj, *obj;
2582
2583 if (!biba_enabled)
2584 return (0);
2585
2586 subj = SLOT(cred->cr_label);
2587 obj = SLOT(shmseglabel);
2588
2589 if (!biba_dominate_effective(obj, subj))
2590 return (EACCES);
2591
2592 return (0);
2593}
2594
2595static void
2596biba_sysvshm_cleanup(struct label *shmlabel)
2597{
2598
2599 bzero(SLOT(shmlabel), sizeof(struct mac_biba));
2600}
2601
2602static void
2603biba_sysvshm_create(struct ucred *cred, struct shmid_kernel *shmsegptr,
2604 struct label *shmlabel)
2605{
2606 struct mac_biba *source, *dest;
2607
2608 source = SLOT(cred->cr_label);
2609 dest = SLOT(shmlabel);
2610
2611 biba_copy_effective(source, dest);
2612}
2613
2614static int
2615biba_vnode_associate_extattr(struct mount *mp, struct label *mplabel,
2616 struct vnode *vp, struct label *vplabel)
2617{
2618 struct mac_biba mb_temp, *source, *dest;
2619 int buflen, error;
2620
2621 source = SLOT(mplabel);
2622 dest = SLOT(vplabel);
2623
2624 buflen = sizeof(mb_temp);
2625 bzero(&mb_temp, buflen);
2626
2627 error = vn_extattr_get(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE,
2628 MAC_BIBA_EXTATTR_NAME, &buflen, (char *) &mb_temp, curthread);
2629 if (error == ENOATTR || error == EOPNOTSUPP) {
2630 /* Fall back to the mntlabel. */
2631 biba_copy_effective(source, dest);
2632 return (0);
2633 } else if (error)
2634 return (error);
2635
2636 if (buflen != sizeof(mb_temp)) {
2637 printf("biba_vnode_associate_extattr: bad size %d\n",
2638 buflen);
2639 return (EPERM);
2640 }
2641 if (biba_valid(&mb_temp) != 0) {
2642 printf("biba_vnode_associate_extattr: invalid\n");
2643 return (EPERM);
2644 }
2645 if ((mb_temp.mb_flags & MAC_BIBA_FLAGS_BOTH) !=
2646 MAC_BIBA_FLAG_EFFECTIVE) {
2647 printf("biba_vnode_associate_extattr: not effective\n");
2648 return (EPERM);
2649 }
2650
2651 biba_copy_effective(&mb_temp, dest);
2652 return (0);
2653}
2654
2655static void
2656biba_vnode_associate_singlelabel(struct mount *mp, struct label *mplabel,
2657 struct vnode *vp, struct label *vplabel)
2658{
2659 struct mac_biba *source, *dest;
2660
2661 source = SLOT(mplabel);
2662 dest = SLOT(vplabel);
2663
2664 biba_copy_effective(source, dest);
2665}
2666
2667static int
2668biba_vnode_check_chdir(struct ucred *cred, struct vnode *dvp,
2669 struct label *dvplabel)
2670{
2671 struct mac_biba *subj, *obj;
2672
2673 if (!biba_enabled)
2674 return (0);
2675
2676 subj = SLOT(cred->cr_label);
2677 obj = SLOT(dvplabel);
2678
2679 if (!biba_dominate_effective(obj, subj))
2680 return (EACCES);
2681
2682 return (0);
2683}
2684
2685static int
2686biba_vnode_check_chroot(struct ucred *cred, struct vnode *dvp,
2687 struct label *dvplabel)
2688{
2689 struct mac_biba *subj, *obj;
2690
2691 if (!biba_enabled)
2692 return (0);
2693
2694 subj = SLOT(cred->cr_label);
2695 obj = SLOT(dvplabel);
2696
2697 if (!biba_dominate_effective(obj, subj))
2698 return (EACCES);
2699
2700 return (0);
2701}
2702
2703static int
2704biba_vnode_check_create(struct ucred *cred, struct vnode *dvp,
2705 struct label *dvplabel, struct componentname *cnp, struct vattr *vap)
2706{
2707 struct mac_biba *subj, *obj;
2708
2709 if (!biba_enabled)
2710 return (0);
2711
2712 subj = SLOT(cred->cr_label);
2713 obj = SLOT(dvplabel);
2714
2715 if (!biba_dominate_effective(subj, obj))
2716 return (EACCES);
2717
2718 return (0);
2719}
2720
2721static int
2722biba_vnode_check_deleteacl(struct ucred *cred, struct vnode *vp,
2723 struct label *vplabel, acl_type_t type)
2724{
2725 struct mac_biba *subj, *obj;
2726
2727 if (!biba_enabled)
2728 return (0);
2729
2730 subj = SLOT(cred->cr_label);
2731 obj = SLOT(vplabel);
2732
2733 if (!biba_dominate_effective(subj, obj))
2734 return (EACCES);
2735
2736 return (0);
2737}
2738
2739static int
2740biba_vnode_check_deleteextattr(struct ucred *cred, struct vnode *vp,
2741 struct label *vplabel, int attrnamespace, const char *name)
2742{
2743 struct mac_biba *subj, *obj;
2744
2745 if (!biba_enabled)
2746 return (0);
2747
2748 subj = SLOT(cred->cr_label);
2749 obj = SLOT(vplabel);
2750
2751 if (!biba_dominate_effective(subj, obj))
2752 return (EACCES);
2753
2754 return (0);
2755}
2756
2757static int
2758biba_vnode_check_exec(struct ucred *cred, struct vnode *vp,
2759 struct label *vplabel, struct image_params *imgp,
2760 struct label *execlabel)
2761{
2762 struct mac_biba *subj, *obj, *exec;
2763 int error;
2764
2765 if (execlabel != NULL) {
2766 /*
2767 * We currently don't permit labels to be changed at
2768 * exec-time as part of Biba, so disallow non-NULL Biba label
2769 * elements in the execlabel.
2770 */
2771 exec = SLOT(execlabel);
2772 error = biba_atmostflags(exec, 0);
2773 if (error)
2774 return (error);
2775 }
2776
2777 if (!biba_enabled)
2778 return (0);
2779
2780 subj = SLOT(cred->cr_label);
2781 obj = SLOT(vplabel);
2782
2783 if (!biba_dominate_effective(obj, subj))
2784 return (EACCES);
2785
2786 return (0);
2787}
2788
2789static int
2790biba_vnode_check_getacl(struct ucred *cred, struct vnode *vp,
2791 struct label *vplabel, acl_type_t type)
2792{
2793 struct mac_biba *subj, *obj;
2794
2795 if (!biba_enabled)
2796 return (0);
2797
2798 subj = SLOT(cred->cr_label);
2799 obj = SLOT(vplabel);
2800
2801 if (!biba_dominate_effective(obj, subj))
2802 return (EACCES);
2803
2804 return (0);
2805}
2806
2807static int
2808biba_vnode_check_getextattr(struct ucred *cred, struct vnode *vp,
2809 struct label *vplabel, int attrnamespace, const char *name)
2810{
2811 struct mac_biba *subj, *obj;
2812
2813 if (!biba_enabled)
2814 return (0);
2815
2816 subj = SLOT(cred->cr_label);
2817 obj = SLOT(vplabel);
2818
2819 if (!biba_dominate_effective(obj, subj))
2820 return (EACCES);
2821
2822 return (0);
2823}
2824
2825static int
2826biba_vnode_check_link(struct ucred *cred, struct vnode *dvp,
2827 struct label *dvplabel, struct vnode *vp, struct label *vplabel,
2828 struct componentname *cnp)
2829{
2830 struct mac_biba *subj, *obj;
2831
2832 if (!biba_enabled)
2833 return (0);
2834
2835 subj = SLOT(cred->cr_label);
2836 obj = SLOT(dvplabel);
2837
2838 if (!biba_dominate_effective(subj, obj))
2839 return (EACCES);
2840
2841 obj = SLOT(vplabel);
2842
2843 if (!biba_dominate_effective(subj, obj))
2844 return (EACCES);
2845
2846 return (0);
2847}
2848
2849static int
2850biba_vnode_check_listextattr(struct ucred *cred, struct vnode *vp,
2851 struct label *vplabel, int attrnamespace)
2852{
2853 struct mac_biba *subj, *obj;
2854
2855 if (!biba_enabled)
2856 return (0);
2857
2858 subj = SLOT(cred->cr_label);
2859 obj = SLOT(vplabel);
2860
2861 if (!biba_dominate_effective(obj, subj))
2862 return (EACCES);
2863
2864 return (0);
2865}
2866
2867static int
2868biba_vnode_check_lookup(struct ucred *cred, struct vnode *dvp,
2869 struct label *dvplabel, struct componentname *cnp)
2870{
2871 struct mac_biba *subj, *obj;
2872
2873 if (!biba_enabled)
2874 return (0);
2875
2876 subj = SLOT(cred->cr_label);
2877 obj = SLOT(dvplabel);
2878
2879 if (!biba_dominate_effective(obj, subj))
2880 return (EACCES);
2881
2882 return (0);
2883}
2884
2885static int
2886biba_vnode_check_mmap(struct ucred *cred, struct vnode *vp,
2887 struct label *vplabel, int prot, int flags)
2888{
2889 struct mac_biba *subj, *obj;
2890
2891 /*
2892 * Rely on the use of open()-time protections to handle
2893 * non-revocation cases.
2894 */
2895 if (!biba_enabled || !revocation_enabled)
2896 return (0);
2897
2898 subj = SLOT(cred->cr_label);
2899 obj = SLOT(vplabel);
2900
2901 if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) {
2902 if (!biba_dominate_effective(obj, subj))
2903 return (EACCES);
2904 }
2905 if (((prot & VM_PROT_WRITE) != 0) && ((flags & MAP_SHARED) != 0)) {
2906 if (!biba_dominate_effective(subj, obj))
2907 return (EACCES);
2908 }
2909
2910 return (0);
2911}
2912
2913static int
2914biba_vnode_check_open(struct ucred *cred, struct vnode *vp,
2915 struct label *vplabel, accmode_t accmode)
2916{
2917 struct mac_biba *subj, *obj;
2918
2919 if (!biba_enabled)
2920 return (0);
2921
2922 subj = SLOT(cred->cr_label);
2923 obj = SLOT(vplabel);
2924
2925 /* XXX privilege override for admin? */
2926 if (accmode & (VREAD | VEXEC | VSTAT_PERMS)) {
2927 if (!biba_dominate_effective(obj, subj))
2928 return (EACCES);
2929 }
2930 if (accmode & VMODIFY_PERMS) {
2931 if (!biba_dominate_effective(subj, obj))
2932 return (EACCES);
2933 }
2934
2935 return (0);
2936}
2937
2938static int
2939biba_vnode_check_poll(struct ucred *active_cred, struct ucred *file_cred,
2940 struct vnode *vp, struct label *vplabel)
2941{
2942 struct mac_biba *subj, *obj;
2943
2944 if (!biba_enabled || !revocation_enabled)
2945 return (0);
2946
2947 subj = SLOT(active_cred->cr_label);
2948 obj = SLOT(vplabel);
2949
2950 if (!biba_dominate_effective(obj, subj))
2951 return (EACCES);
2952
2953 return (0);
2954}
2955
2956static int
2957biba_vnode_check_read(struct ucred *active_cred, struct ucred *file_cred,
2958 struct vnode *vp, struct label *vplabel)
2959{
2960 struct mac_biba *subj, *obj;
2961
2962 if (!biba_enabled || !revocation_enabled)
2963 return (0);
2964
2965 subj = SLOT(active_cred->cr_label);
2966 obj = SLOT(vplabel);
2967
2968 if (!biba_dominate_effective(obj, subj))
2969 return (EACCES);
2970
2971 return (0);
2972}
2973
2974static int
2975biba_vnode_check_readdir(struct ucred *cred, struct vnode *dvp,
2976 struct label *dvplabel)
2977{
2978 struct mac_biba *subj, *obj;
2979
2980 if (!biba_enabled)
2981 return (0);
2982
2983 subj = SLOT(cred->cr_label);
2984 obj = SLOT(dvplabel);
2985
2986 if (!biba_dominate_effective(obj, subj))
2987 return (EACCES);
2988
2989 return (0);
2990}
2991
2992static int
2993biba_vnode_check_readlink(struct ucred *cred, struct vnode *vp,
2994 struct label *vplabel)
2995{
2996 struct mac_biba *subj, *obj;
2997
2998 if (!biba_enabled)
2999 return (0);
3000
3001 subj = SLOT(cred->cr_label);
3002 obj = SLOT(vplabel);
3003
3004 if (!biba_dominate_effective(obj, subj))
3005 return (EACCES);
3006
3007 return (0);
3008}
3009
3010static int
3011biba_vnode_check_relabel(struct ucred *cred, struct vnode *vp,
3012 struct label *vplabel, struct label *newlabel)
3013{
3014 struct mac_biba *old, *new, *subj;
3015 int error;
3016
3017 old = SLOT(vplabel);
3018 new = SLOT(newlabel);
3019 subj = SLOT(cred->cr_label);
3020
3021 /*
3022 * If there is a Biba label update for the vnode, it must be a
3023 * effective label.
3024 */
3025 error = biba_atmostflags(new, MAC_BIBA_FLAG_EFFECTIVE);
3026 if (error)
3027 return (error);
3028
3029 /*
3030 * To perform a relabel of the vnode (Biba label or not), Biba must
3031 * authorize the relabel.
3032 */
3033 if (!biba_effective_in_range(old, subj))
3034 return (EPERM);
3035
3036 /*
3037 * If the Biba label is to be changed, authorize as appropriate.
3038 */
3039 if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) {
3040 /*
3041 * To change the Biba label on a vnode, the new vnode label
3042 * must be in the subject range.
3043 */
3044 if (!biba_effective_in_range(new, subj))
3045 return (EPERM);
3046
3047 /*
3048 * To change the Biba label on the vnode to be EQUAL, the
3049 * subject must have appropriate privilege.
3050 */
3051 if (biba_contains_equal(new)) {
3052 error = biba_subject_privileged(subj);
3053 if (error)
3054 return (error);
3055 }
3056 }
3057
3058 return (0);
3059}
3060
3061static int
3062biba_vnode_check_rename_from(struct ucred *cred, struct vnode *dvp,
3063 struct label *dvplabel, struct vnode *vp, struct label *vplabel,
3064 struct componentname *cnp)
3065{
3066 struct mac_biba *subj, *obj;
3067
3068 if (!biba_enabled)
3069 return (0);
3070
3071 subj = SLOT(cred->cr_label);
3072 obj = SLOT(dvplabel);
3073
3074 if (!biba_dominate_effective(subj, obj))
3075 return (EACCES);
3076
3077 obj = SLOT(vplabel);
3078
3079 if (!biba_dominate_effective(subj, obj))
3080 return (EACCES);
3081
3082 return (0);
3083}
3084
3085static int
3086biba_vnode_check_rename_to(struct ucred *cred, struct vnode *dvp,
3087 struct label *dvplabel, struct vnode *vp, struct label *vplabel,
3088 int samedir, struct componentname *cnp)
3089{
3090 struct mac_biba *subj, *obj;
3091
3092 if (!biba_enabled)
3093 return (0);
3094
3095 subj = SLOT(cred->cr_label);
3096 obj = SLOT(dvplabel);
3097
3098 if (!biba_dominate_effective(subj, obj))
3099 return (EACCES);
3100
3101 if (vp != NULL) {
3102 obj = SLOT(vplabel);
3103
3104 if (!biba_dominate_effective(subj, obj))
3105 return (EACCES);
3106 }
3107
3108 return (0);
3109}
3110
3111static int
3112biba_vnode_check_revoke(struct ucred *cred, struct vnode *vp,
3113 struct label *vplabel)
3114{
3115 struct mac_biba *subj, *obj;
3116
3117 if (!biba_enabled)
3118 return (0);
3119
3120 subj = SLOT(cred->cr_label);
3121 obj = SLOT(vplabel);
3122
3123 if (!biba_dominate_effective(subj, obj))
3124 return (EACCES);
3125
3126 return (0);
3127}
3128
3129static int
3130biba_vnode_check_setacl(struct ucred *cred, struct vnode *vp,
3131 struct label *vplabel, acl_type_t type, struct acl *acl)
3132{
3133 struct mac_biba *subj, *obj;
3134
3135 if (!biba_enabled)
3136 return (0);
3137
3138 subj = SLOT(cred->cr_label);
3139 obj = SLOT(vplabel);
3140
3141 if (!biba_dominate_effective(subj, obj))
3142 return (EACCES);
3143
3144 return (0);
3145}
3146
3147static int
3148biba_vnode_check_setextattr(struct ucred *cred, struct vnode *vp,
3149 struct label *vplabel, int attrnamespace, const char *name)
3150{
3151 struct mac_biba *subj, *obj;
3152
3153 if (!biba_enabled)
3154 return (0);
3155
3156 subj = SLOT(cred->cr_label);
3157 obj = SLOT(vplabel);
3158
3159 if (!biba_dominate_effective(subj, obj))
3160 return (EACCES);
3161
3162 /* XXX: protect the MAC EA in a special way? */
3163
3164 return (0);
3165}
3166
3167static int
3168biba_vnode_check_setflags(struct ucred *cred, struct vnode *vp,
3169 struct label *vplabel, u_long flags)
3170{
3171 struct mac_biba *subj, *obj;
3172
3173 if (!biba_enabled)
3174 return (0);
3175
3176 subj = SLOT(cred->cr_label);
3177 obj = SLOT(vplabel);
3178
3179 if (!biba_dominate_effective(subj, obj))
3180 return (EACCES);
3181
3182 return (0);
3183}
3184
3185static int
3186biba_vnode_check_setmode(struct ucred *cred, struct vnode *vp,
3187 struct label *vplabel, mode_t mode)
3188{
3189 struct mac_biba *subj, *obj;
3190
3191 if (!biba_enabled)
3192 return (0);
3193
3194 subj = SLOT(cred->cr_label);
3195 obj = SLOT(vplabel);
3196
3197 if (!biba_dominate_effective(subj, obj))
3198 return (EACCES);
3199
3200 return (0);
3201}
3202
3203static int
3204biba_vnode_check_setowner(struct ucred *cred, struct vnode *vp,
3205 struct label *vplabel, uid_t uid, gid_t gid)
3206{
3207 struct mac_biba *subj, *obj;
3208
3209 if (!biba_enabled)
3210 return (0);
3211
3212 subj = SLOT(cred->cr_label);
3213 obj = SLOT(vplabel);
3214
3215 if (!biba_dominate_effective(subj, obj))
3216 return (EACCES);
3217
3218 return (0);
3219}
3220
3221static int
3222biba_vnode_check_setutimes(struct ucred *cred, struct vnode *vp,
3223 struct label *vplabel, struct timespec atime, struct timespec mtime)
3224{
3225 struct mac_biba *subj, *obj;
3226
3227 if (!biba_enabled)
3228 return (0);
3229
3230 subj = SLOT(cred->cr_label);
3231 obj = SLOT(vplabel);
3232
3233 if (!biba_dominate_effective(subj, obj))
3234 return (EACCES);
3235
3236 return (0);
3237}
3238
3239static int
3240biba_vnode_check_stat(struct ucred *active_cred, struct ucred *file_cred,
3241 struct vnode *vp, struct label *vplabel)
3242{
3243 struct mac_biba *subj, *obj;
3244
3245 if (!biba_enabled)
3246 return (0);
3247
3248 subj = SLOT(active_cred->cr_label);
3249 obj = SLOT(vplabel);
3250
3251 if (!biba_dominate_effective(obj, subj))
3252 return (EACCES);
3253
3254 return (0);
3255}
3256
3257static int
3258biba_vnode_check_unlink(struct ucred *cred, struct vnode *dvp,
3259 struct label *dvplabel, struct vnode *vp, struct label *vplabel,
3260 struct componentname *cnp)
3261{
3262 struct mac_biba *subj, *obj;
3263
3264 if (!biba_enabled)
3265 return (0);
3266
3267 subj = SLOT(cred->cr_label);
3268 obj = SLOT(dvplabel);
3269
3270 if (!biba_dominate_effective(subj, obj))
3271 return (EACCES);
3272
3273 obj = SLOT(vplabel);
3274
3275 if (!biba_dominate_effective(subj, obj))
3276 return (EACCES);
3277
3278 return (0);
3279}
3280
3281static int
3282biba_vnode_check_write(struct ucred *active_cred,
3283 struct ucred *file_cred, struct vnode *vp, struct label *vplabel)
3284{
3285 struct mac_biba *subj, *obj;
3286
3287 if (!biba_enabled || !revocation_enabled)
3288 return (0);
3289
3290 subj = SLOT(active_cred->cr_label);
3291 obj = SLOT(vplabel);
3292
3293 if (!biba_dominate_effective(subj, obj))
3294 return (EACCES);
3295
3296 return (0);
3297}
3298
3299static int
3300biba_vnode_create_extattr(struct ucred *cred, struct mount *mp,
3301 struct label *mplabel, struct vnode *dvp, struct label *dvplabel,
3302 struct vnode *vp, struct label *vplabel, struct componentname *cnp)
3303{
3304 struct mac_biba *source, *dest, mb_temp;
3305 size_t buflen;
3306 int error;
3307
3308 buflen = sizeof(mb_temp);
3309 bzero(&mb_temp, buflen);
3310
3311 source = SLOT(cred->cr_label);
3312 dest = SLOT(vplabel);
3313 biba_copy_effective(source, &mb_temp);
3314
3315 error = vn_extattr_set(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE,
3316 MAC_BIBA_EXTATTR_NAME, buflen, (char *) &mb_temp, curthread);
3317 if (error == 0)
3318 biba_copy_effective(source, dest);
3319 return (error);
3320}
3321
3322static void
3323biba_vnode_relabel(struct ucred *cred, struct vnode *vp,
3324 struct label *vplabel, struct label *newlabel)
3325{
3326 struct mac_biba *source, *dest;
3327
3328 source = SLOT(newlabel);
3329 dest = SLOT(vplabel);
3330
3331 biba_copy(source, dest);
3332}
3333
3334static int
3335biba_vnode_setlabel_extattr(struct ucred *cred, struct vnode *vp,
3336 struct label *vplabel, struct label *intlabel)
3337{
3338 struct mac_biba *source, mb_temp;
3339 size_t buflen;
3340 int error;
3341
3342 buflen = sizeof(mb_temp);
3343 bzero(&mb_temp, buflen);
3344
3345 source = SLOT(intlabel);
3346 if ((source->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) == 0)
3347 return (0);
3348
3349 biba_copy_effective(source, &mb_temp);
3350
3351 error = vn_extattr_set(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE,
3352 MAC_BIBA_EXTATTR_NAME, buflen, (char *) &mb_temp, curthread);
3353 return (error);
3354}
3355
3356static struct mac_policy_ops mac_biba_ops =
3357{
3358 .mpo_init = biba_init,
3359
3360 .mpo_bpfdesc_check_receive = biba_bpfdesc_check_receive,
3361 .mpo_bpfdesc_create = biba_bpfdesc_create,
3362 .mpo_bpfdesc_create_mbuf = biba_bpfdesc_create_mbuf,
3363 .mpo_bpfdesc_destroy_label = biba_destroy_label,
3364 .mpo_bpfdesc_init_label = biba_init_label,
3365
3366 .mpo_cred_associate_nfsd = biba_cred_associate_nfsd,
3367 .mpo_cred_check_relabel = biba_cred_check_relabel,
3368 .mpo_cred_check_visible = biba_cred_check_visible,
3369 .mpo_cred_copy_label = biba_copy_label,
3370 .mpo_cred_create_init = biba_cred_create_init,
3371 .mpo_cred_create_swapper = biba_cred_create_swapper,
3372 .mpo_cred_destroy_label = biba_destroy_label,
3373 .mpo_cred_externalize_label = biba_externalize_label,
3374 .mpo_cred_init_label = biba_init_label,
3375 .mpo_cred_internalize_label = biba_internalize_label,
3376 .mpo_cred_relabel = biba_cred_relabel,
3377
3378 .mpo_devfs_create_device = biba_devfs_create_device,
3379 .mpo_devfs_create_directory = biba_devfs_create_directory,
3380 .mpo_devfs_create_symlink = biba_devfs_create_symlink,
3381 .mpo_devfs_destroy_label = biba_destroy_label,
3382 .mpo_devfs_init_label = biba_init_label,
3383 .mpo_devfs_update = biba_devfs_update,
3384 .mpo_devfs_vnode_associate = biba_devfs_vnode_associate,
3385
3386 .mpo_ifnet_check_relabel = biba_ifnet_check_relabel,
3387 .mpo_ifnet_check_transmit = biba_ifnet_check_transmit,
3388 .mpo_ifnet_copy_label = biba_copy_label,
3389 .mpo_ifnet_create = biba_ifnet_create,
3390 .mpo_ifnet_create_mbuf = biba_ifnet_create_mbuf,
3391 .mpo_ifnet_destroy_label = biba_destroy_label,
3392 .mpo_ifnet_externalize_label = biba_externalize_label,
3393 .mpo_ifnet_init_label = biba_init_label,
3394 .mpo_ifnet_internalize_label = biba_internalize_label,
3395 .mpo_ifnet_relabel = biba_ifnet_relabel,
3396
3397 .mpo_inpcb_check_deliver = biba_inpcb_check_deliver,
3398 .mpo_inpcb_check_visible = biba_inpcb_check_visible,
3399 .mpo_inpcb_create = biba_inpcb_create,
3400 .mpo_inpcb_create_mbuf = biba_inpcb_create_mbuf,
3401 .mpo_inpcb_destroy_label = biba_destroy_label,
3402 .mpo_inpcb_init_label = biba_init_label_waitcheck,
3403 .mpo_inpcb_sosetlabel = biba_inpcb_sosetlabel,
3404
3405 .mpo_ip6q_create = biba_ip6q_create,
3406 .mpo_ip6q_destroy_label = biba_destroy_label,
3407 .mpo_ip6q_init_label = biba_init_label_waitcheck,
3408 .mpo_ip6q_match = biba_ip6q_match,
3409 .mpo_ip6q_reassemble = biba_ip6q_reassemble,
3410 .mpo_ip6q_update = biba_ip6q_update,
3411
3412 .mpo_ipq_create = biba_ipq_create,
3413 .mpo_ipq_destroy_label = biba_destroy_label,
3414 .mpo_ipq_init_label = biba_init_label_waitcheck,
3415 .mpo_ipq_match = biba_ipq_match,
3416 .mpo_ipq_reassemble = biba_ipq_reassemble,
3417 .mpo_ipq_update = biba_ipq_update,
3418
3419 .mpo_kld_check_load = biba_kld_check_load,
3420
3421 .mpo_mbuf_copy_label = biba_copy_label,
3422 .mpo_mbuf_destroy_label = biba_destroy_label,
3423 .mpo_mbuf_init_label = biba_init_label_waitcheck,
3424
3425 .mpo_mount_check_stat = biba_mount_check_stat,
3426 .mpo_mount_create = biba_mount_create,
3427 .mpo_mount_destroy_label = biba_destroy_label,
3428 .mpo_mount_init_label = biba_init_label,
3429
3430 .mpo_netatalk_aarp_send = biba_netatalk_aarp_send,
3431
3432 .mpo_netinet_arp_send = biba_netinet_arp_send,
3433 .mpo_netinet_firewall_reply = biba_netinet_firewall_reply,
3434 .mpo_netinet_firewall_send = biba_netinet_firewall_send,
3435 .mpo_netinet_fragment = biba_netinet_fragment,
3436 .mpo_netinet_icmp_reply = biba_netinet_icmp_reply,
3437 .mpo_netinet_igmp_send = biba_netinet_igmp_send,
3438
3439 .mpo_netinet6_nd6_send = biba_netinet6_nd6_send,
3440
3441 .mpo_pipe_check_ioctl = biba_pipe_check_ioctl,
3442 .mpo_pipe_check_poll = biba_pipe_check_poll,
3443 .mpo_pipe_check_read = biba_pipe_check_read,
3444 .mpo_pipe_check_relabel = biba_pipe_check_relabel,
3445 .mpo_pipe_check_stat = biba_pipe_check_stat,
3446 .mpo_pipe_check_write = biba_pipe_check_write,
3447 .mpo_pipe_copy_label = biba_copy_label,
3448 .mpo_pipe_create = biba_pipe_create,
3449 .mpo_pipe_destroy_label = biba_destroy_label,
3450 .mpo_pipe_externalize_label = biba_externalize_label,
3451 .mpo_pipe_init_label = biba_init_label,
3452 .mpo_pipe_internalize_label = biba_internalize_label,
3453 .mpo_pipe_relabel = biba_pipe_relabel,
3454
3455 .mpo_posixsem_check_getvalue = biba_posixsem_check_rdonly,
3456 .mpo_posixsem_check_open = biba_posixsem_check_openunlink,
3457 .mpo_posixsem_check_post = biba_posixsem_check_write,
| 1861/*
1862 * Some system privileges are allowed regardless of integrity grade; others
1863 * are allowed only when running with privilege with respect to the Biba
1864 * policy as they might otherwise allow bypassing of the integrity policy.
1865 */
1866static int
1867biba_priv_check(struct ucred *cred, int priv)
1868{
1869 struct mac_biba *subj;
1870 int error;
1871
1872 if (!biba_enabled)
1873 return (0);
1874
1875 /*
1876 * Exempt only specific privileges from the Biba integrity policy.
1877 */
1878 switch (priv) {
1879 case PRIV_KTRACE:
1880 case PRIV_MSGBUF:
1881
1882 /*
1883 * Allow processes to manipulate basic process audit properties, and
1884 * to submit audit records.
1885 */
1886 case PRIV_AUDIT_GETAUDIT:
1887 case PRIV_AUDIT_SETAUDIT:
1888 case PRIV_AUDIT_SUBMIT:
1889
1890 /*
1891 * Allow processes to manipulate their regular UNIX credentials.
1892 */
1893 case PRIV_CRED_SETUID:
1894 case PRIV_CRED_SETEUID:
1895 case PRIV_CRED_SETGID:
1896 case PRIV_CRED_SETEGID:
1897 case PRIV_CRED_SETGROUPS:
1898 case PRIV_CRED_SETREUID:
1899 case PRIV_CRED_SETREGID:
1900 case PRIV_CRED_SETRESUID:
1901 case PRIV_CRED_SETRESGID:
1902
1903 /*
1904 * Allow processes to perform system monitoring.
1905 */
1906 case PRIV_SEEOTHERGIDS:
1907 case PRIV_SEEOTHERUIDS:
1908 break;
1909
1910 /*
1911 * Allow access to general process debugging facilities. We
1912 * separately control debugging based on MAC label.
1913 */
1914 case PRIV_DEBUG_DIFFCRED:
1915 case PRIV_DEBUG_SUGID:
1916 case PRIV_DEBUG_UNPRIV:
1917
1918 /*
1919 * Allow manipulating jails.
1920 */
1921 case PRIV_JAIL_ATTACH:
1922
1923 /*
1924 * Allow privilege with respect to the Partition policy, but not the
1925 * Privs policy.
1926 */
1927 case PRIV_MAC_PARTITION:
1928
1929 /*
1930 * Allow privilege with respect to process resource limits and login
1931 * context.
1932 */
1933 case PRIV_PROC_LIMIT:
1934 case PRIV_PROC_SETLOGIN:
1935 case PRIV_PROC_SETRLIMIT:
1936
1937 /*
1938 * Allow System V and POSIX IPC privileges.
1939 */
1940 case PRIV_IPC_READ:
1941 case PRIV_IPC_WRITE:
1942 case PRIV_IPC_ADMIN:
1943 case PRIV_IPC_MSGSIZE:
1944 case PRIV_MQ_ADMIN:
1945
1946 /*
1947 * Allow certain scheduler manipulations -- possibly this should be
1948 * controlled by more fine-grained policy, as potentially low
1949 * integrity processes can deny CPU to higher integrity ones.
1950 */
1951 case PRIV_SCHED_DIFFCRED:
1952 case PRIV_SCHED_SETPRIORITY:
1953 case PRIV_SCHED_RTPRIO:
1954 case PRIV_SCHED_SETPOLICY:
1955 case PRIV_SCHED_SET:
1956 case PRIV_SCHED_SETPARAM:
1957
1958 /*
1959 * More IPC privileges.
1960 */
1961 case PRIV_SEM_WRITE:
1962
1963 /*
1964 * Allow signaling privileges subject to integrity policy.
1965 */
1966 case PRIV_SIGNAL_DIFFCRED:
1967 case PRIV_SIGNAL_SUGID:
1968
1969 /*
1970 * Allow access to only limited sysctls from lower integrity levels;
1971 * piggy-back on the Jail definition.
1972 */
1973 case PRIV_SYSCTL_WRITEJAIL:
1974
1975 /*
1976 * Allow TTY-based privileges, subject to general device access using
1977 * labels on TTY device nodes, but not console privilege.
1978 */
1979 case PRIV_TTY_DRAINWAIT:
1980 case PRIV_TTY_DTRWAIT:
1981 case PRIV_TTY_EXCLUSIVE:
1982 case PRIV_TTY_STI:
1983 case PRIV_TTY_SETA:
1984
1985 /*
1986 * Grant most VFS privileges, as almost all are in practice bounded
1987 * by more specific checks using labels.
1988 */
1989 case PRIV_VFS_READ:
1990 case PRIV_VFS_WRITE:
1991 case PRIV_VFS_ADMIN:
1992 case PRIV_VFS_EXEC:
1993 case PRIV_VFS_LOOKUP:
1994 case PRIV_VFS_CHFLAGS_DEV:
1995 case PRIV_VFS_CHOWN:
1996 case PRIV_VFS_CHROOT:
1997 case PRIV_VFS_RETAINSUGID:
1998 case PRIV_VFS_EXCEEDQUOTA:
1999 case PRIV_VFS_FCHROOT:
2000 case PRIV_VFS_FHOPEN:
2001 case PRIV_VFS_FHSTATFS:
2002 case PRIV_VFS_GENERATION:
2003 case PRIV_VFS_GETFH:
2004 case PRIV_VFS_GETQUOTA:
2005 case PRIV_VFS_LINK:
2006 case PRIV_VFS_MOUNT:
2007 case PRIV_VFS_MOUNT_OWNER:
2008 case PRIV_VFS_MOUNT_PERM:
2009 case PRIV_VFS_MOUNT_SUIDDIR:
2010 case PRIV_VFS_MOUNT_NONUSER:
2011 case PRIV_VFS_SETGID:
2012 case PRIV_VFS_STICKYFILE:
2013 case PRIV_VFS_SYSFLAGS:
2014 case PRIV_VFS_UNMOUNT:
2015
2016 /*
2017 * Allow VM privileges; it would be nice if these were subject to
2018 * resource limits.
2019 */
2020 case PRIV_VM_MADV_PROTECT:
2021 case PRIV_VM_MLOCK:
2022 case PRIV_VM_MUNLOCK:
2023 case PRIV_VM_SWAP_NOQUOTA:
2024 case PRIV_VM_SWAP_NORLIMIT:
2025
2026 /*
2027 * Allow some but not all network privileges. In general, dont allow
2028 * reconfiguring the network stack, just normal use.
2029 */
2030 case PRIV_NETATALK_RESERVEDPORT:
2031 case PRIV_NETINET_RESERVEDPORT:
2032 case PRIV_NETINET_RAW:
2033 case PRIV_NETINET_REUSEPORT:
2034 case PRIV_NETIPX_RESERVEDPORT:
2035 case PRIV_NETIPX_RAW:
2036 break;
2037
2038 /*
2039 * All remaining system privileges are allow only if the process
2040 * holds privilege with respect to the Biba policy.
2041 */
2042 default:
2043 subj = SLOT(cred->cr_label);
2044 error = biba_subject_privileged(subj);
2045 if (error)
2046 return (error);
2047 }
2048 return (0);
2049}
2050
2051static int
2052biba_proc_check_debug(struct ucred *cred, struct proc *p)
2053{
2054 struct mac_biba *subj, *obj;
2055
2056 if (!biba_enabled)
2057 return (0);
2058
2059 subj = SLOT(cred->cr_label);
2060 obj = SLOT(p->p_ucred->cr_label);
2061
2062 /* XXX: range checks */
2063 if (!biba_dominate_effective(obj, subj))
2064 return (ESRCH);
2065 if (!biba_dominate_effective(subj, obj))
2066 return (EACCES);
2067
2068 return (0);
2069}
2070
2071static int
2072biba_proc_check_sched(struct ucred *cred, struct proc *p)
2073{
2074 struct mac_biba *subj, *obj;
2075
2076 if (!biba_enabled)
2077 return (0);
2078
2079 subj = SLOT(cred->cr_label);
2080 obj = SLOT(p->p_ucred->cr_label);
2081
2082 /* XXX: range checks */
2083 if (!biba_dominate_effective(obj, subj))
2084 return (ESRCH);
2085 if (!biba_dominate_effective(subj, obj))
2086 return (EACCES);
2087
2088 return (0);
2089}
2090
2091static int
2092biba_proc_check_signal(struct ucred *cred, struct proc *p, int signum)
2093{
2094 struct mac_biba *subj, *obj;
2095
2096 if (!biba_enabled)
2097 return (0);
2098
2099 subj = SLOT(cred->cr_label);
2100 obj = SLOT(p->p_ucred->cr_label);
2101
2102 /* XXX: range checks */
2103 if (!biba_dominate_effective(obj, subj))
2104 return (ESRCH);
2105 if (!biba_dominate_effective(subj, obj))
2106 return (EACCES);
2107
2108 return (0);
2109}
2110
2111static int
2112biba_socket_check_deliver(struct socket *so, struct label *solabel,
2113 struct mbuf *m, struct label *mlabel)
2114{
2115 struct mac_biba *p, *s;
2116 int error;
2117
2118 if (!biba_enabled)
2119 return (0);
2120
2121 p = SLOT(mlabel);
2122 s = SLOT(solabel);
2123
2124 SOCK_LOCK(so);
2125 error = biba_equal_effective(p, s) ? 0 : EACCES;
2126 SOCK_UNLOCK(so);
2127 return (error);
2128}
2129
2130static int
2131biba_socket_check_relabel(struct ucred *cred, struct socket *so,
2132 struct label *solabel, struct label *newlabel)
2133{
2134 struct mac_biba *subj, *obj, *new;
2135 int error;
2136
2137 SOCK_LOCK_ASSERT(so);
2138
2139 new = SLOT(newlabel);
2140 subj = SLOT(cred->cr_label);
2141 obj = SLOT(solabel);
2142
2143 /*
2144 * If there is a Biba label update for the socket, it may be an
2145 * update of effective.
2146 */
2147 error = biba_atmostflags(new, MAC_BIBA_FLAG_EFFECTIVE);
2148 if (error)
2149 return (error);
2150
2151 /*
2152 * To relabel a socket, the old socket effective must be in the
2153 * subject range.
2154 */
2155 if (!biba_effective_in_range(obj, subj))
2156 return (EPERM);
2157
2158 /*
2159 * If the Biba label is to be changed, authorize as appropriate.
2160 */
2161 if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) {
2162 /*
2163 * To relabel a socket, the new socket effective must be in
2164 * the subject range.
2165 */
2166 if (!biba_effective_in_range(new, subj))
2167 return (EPERM);
2168
2169 /*
2170 * To change the Biba label on the socket to contain EQUAL,
2171 * the subject must have appropriate privilege.
2172 */
2173 if (biba_contains_equal(new)) {
2174 error = biba_subject_privileged(subj);
2175 if (error)
2176 return (error);
2177 }
2178 }
2179
2180 return (0);
2181}
2182
2183static int
2184biba_socket_check_visible(struct ucred *cred, struct socket *so,
2185 struct label *solabel)
2186{
2187 struct mac_biba *subj, *obj;
2188
2189 if (!biba_enabled)
2190 return (0);
2191
2192 subj = SLOT(cred->cr_label);
2193 obj = SLOT(solabel);
2194
2195 SOCK_LOCK(so);
2196 if (!biba_dominate_effective(obj, subj)) {
2197 SOCK_UNLOCK(so);
2198 return (ENOENT);
2199 }
2200 SOCK_UNLOCK(so);
2201
2202 return (0);
2203}
2204
2205static void
2206biba_socket_create(struct ucred *cred, struct socket *so,
2207 struct label *solabel)
2208{
2209 struct mac_biba *source, *dest;
2210
2211 source = SLOT(cred->cr_label);
2212 dest = SLOT(solabel);
2213
2214 biba_copy_effective(source, dest);
2215}
2216
2217static void
2218biba_socket_create_mbuf(struct socket *so, struct label *solabel,
2219 struct mbuf *m, struct label *mlabel)
2220{
2221 struct mac_biba *source, *dest;
2222
2223 source = SLOT(solabel);
2224 dest = SLOT(mlabel);
2225
2226 SOCK_LOCK(so);
2227 biba_copy_effective(source, dest);
2228 SOCK_UNLOCK(so);
2229}
2230
2231static void
2232biba_socket_newconn(struct socket *oldso, struct label *oldsolabel,
2233 struct socket *newso, struct label *newsolabel)
2234{
2235 struct mac_biba source, *dest;
2236
2237 SOCK_LOCK(oldso);
2238 source = *SLOT(oldsolabel);
2239 SOCK_UNLOCK(oldso);
2240
2241 dest = SLOT(newsolabel);
2242
2243 SOCK_LOCK(newso);
2244 biba_copy_effective(&source, dest);
2245 SOCK_UNLOCK(newso);
2246}
2247
2248static void
2249biba_socket_relabel(struct ucred *cred, struct socket *so,
2250 struct label *solabel, struct label *newlabel)
2251{
2252 struct mac_biba *source, *dest;
2253
2254 SOCK_LOCK_ASSERT(so);
2255
2256 source = SLOT(newlabel);
2257 dest = SLOT(solabel);
2258
2259 biba_copy(source, dest);
2260}
2261
2262static void
2263biba_socketpeer_set_from_mbuf(struct mbuf *m, struct label *mlabel,
2264 struct socket *so, struct label *sopeerlabel)
2265{
2266 struct mac_biba *source, *dest;
2267
2268 source = SLOT(mlabel);
2269 dest = SLOT(sopeerlabel);
2270
2271 SOCK_LOCK(so);
2272 biba_copy_effective(source, dest);
2273 SOCK_UNLOCK(so);
2274}
2275
2276static void
2277biba_socketpeer_set_from_socket(struct socket *oldso,
2278 struct label *oldsolabel, struct socket *newso,
2279 struct label *newsopeerlabel)
2280{
2281 struct mac_biba source, *dest;
2282
2283 SOCK_LOCK(oldso);
2284 source = *SLOT(oldsolabel);
2285 SOCK_UNLOCK(oldso);
2286 dest = SLOT(newsopeerlabel);
2287
2288 SOCK_LOCK(newso);
2289 biba_copy_effective(&source, dest);
2290 SOCK_UNLOCK(newso);
2291}
2292
2293static void
2294biba_syncache_create(struct label *label, struct inpcb *inp)
2295{
2296 struct mac_biba *source, *dest;
2297
2298 source = SLOT(inp->inp_label);
2299 dest = SLOT(label);
2300 biba_copy_effective(source, dest);
2301}
2302
2303static void
2304biba_syncache_create_mbuf(struct label *sc_label, struct mbuf *m,
2305 struct label *mlabel)
2306{
2307 struct mac_biba *source, *dest;
2308
2309 source = SLOT(sc_label);
2310 dest = SLOT(mlabel);
2311 biba_copy_effective(source, dest);
2312}
2313
2314static int
2315biba_system_check_acct(struct ucred *cred, struct vnode *vp,
2316 struct label *vplabel)
2317{
2318 struct mac_biba *subj, *obj;
2319 int error;
2320
2321 if (!biba_enabled)
2322 return (0);
2323
2324 subj = SLOT(cred->cr_label);
2325
2326 error = biba_subject_privileged(subj);
2327 if (error)
2328 return (error);
2329
2330 if (vplabel == NULL)
2331 return (0);
2332
2333 obj = SLOT(vplabel);
2334 if (!biba_high_effective(obj))
2335 return (EACCES);
2336
2337 return (0);
2338}
2339
2340static int
2341biba_system_check_auditctl(struct ucred *cred, struct vnode *vp,
2342 struct label *vplabel)
2343{
2344 struct mac_biba *subj, *obj;
2345 int error;
2346
2347 if (!biba_enabled)
2348 return (0);
2349
2350 subj = SLOT(cred->cr_label);
2351
2352 error = biba_subject_privileged(subj);
2353 if (error)
2354 return (error);
2355
2356 if (vplabel == NULL)
2357 return (0);
2358
2359 obj = SLOT(vplabel);
2360 if (!biba_high_effective(obj))
2361 return (EACCES);
2362
2363 return (0);
2364}
2365
2366static int
2367biba_system_check_auditon(struct ucred *cred, int cmd)
2368{
2369 struct mac_biba *subj;
2370 int error;
2371
2372 if (!biba_enabled)
2373 return (0);
2374
2375 subj = SLOT(cred->cr_label);
2376
2377 error = biba_subject_privileged(subj);
2378 if (error)
2379 return (error);
2380
2381 return (0);
2382}
2383
2384static int
2385biba_system_check_swapoff(struct ucred *cred, struct vnode *vp,
2386 struct label *label)
2387{
2388 struct mac_biba *subj;
2389 int error;
2390
2391 if (!biba_enabled)
2392 return (0);
2393
2394 subj = SLOT(cred->cr_label);
2395
2396 error = biba_subject_privileged(subj);
2397 if (error)
2398 return (error);
2399
2400 return (0);
2401}
2402
2403static int
2404biba_system_check_swapon(struct ucred *cred, struct vnode *vp,
2405 struct label *vplabel)
2406{
2407 struct mac_biba *subj, *obj;
2408 int error;
2409
2410 if (!biba_enabled)
2411 return (0);
2412
2413 subj = SLOT(cred->cr_label);
2414 obj = SLOT(vplabel);
2415
2416 error = biba_subject_privileged(subj);
2417 if (error)
2418 return (error);
2419
2420 if (!biba_high_effective(obj))
2421 return (EACCES);
2422
2423 return (0);
2424}
2425
2426static int
2427biba_system_check_sysctl(struct ucred *cred, struct sysctl_oid *oidp,
2428 void *arg1, int arg2, struct sysctl_req *req)
2429{
2430 struct mac_biba *subj;
2431 int error;
2432
2433 if (!biba_enabled)
2434 return (0);
2435
2436 subj = SLOT(cred->cr_label);
2437
2438 /*
2439 * Treat sysctl variables without CTLFLAG_ANYBODY flag as biba/high,
2440 * but also require privilege to change them.
2441 */
2442 if (req->newptr != NULL && (oidp->oid_kind & CTLFLAG_ANYBODY) == 0) {
2443 if (!biba_subject_dominate_high(subj))
2444 return (EACCES);
2445
2446 error = biba_subject_privileged(subj);
2447 if (error)
2448 return (error);
2449 }
2450
2451 return (0);
2452}
2453
2454static void
2455biba_sysvmsg_cleanup(struct label *msglabel)
2456{
2457
2458 bzero(SLOT(msglabel), sizeof(struct mac_biba));
2459}
2460
2461static void
2462biba_sysvmsg_create(struct ucred *cred, struct msqid_kernel *msqkptr,
2463 struct label *msqlabel, struct msg *msgptr, struct label *msglabel)
2464{
2465 struct mac_biba *source, *dest;
2466
2467 /* Ignore the msgq label */
2468 source = SLOT(cred->cr_label);
2469 dest = SLOT(msglabel);
2470
2471 biba_copy_effective(source, dest);
2472}
2473
2474static int
2475biba_sysvmsq_check_msgrcv(struct ucred *cred, struct msg *msgptr,
2476 struct label *msglabel)
2477{
2478 struct mac_biba *subj, *obj;
2479
2480 if (!biba_enabled)
2481 return (0);
2482
2483 subj = SLOT(cred->cr_label);
2484 obj = SLOT(msglabel);
2485
2486 if (!biba_dominate_effective(obj, subj))
2487 return (EACCES);
2488
2489 return (0);
2490}
2491
2492static int
2493biba_sysvmsq_check_msgrmid(struct ucred *cred, struct msg *msgptr,
2494 struct label *msglabel)
2495{
2496 struct mac_biba *subj, *obj;
2497
2498 if (!biba_enabled)
2499 return (0);
2500
2501 subj = SLOT(cred->cr_label);
2502 obj = SLOT(msglabel);
2503
2504 if (!biba_dominate_effective(subj, obj))
2505 return (EACCES);
2506
2507 return (0);
2508}
2509
2510static int
2511biba_sysvmsq_check_msqget(struct ucred *cred, struct msqid_kernel *msqkptr,
2512 struct label *msqklabel)
2513{
2514 struct mac_biba *subj, *obj;
2515
2516 if (!biba_enabled)
2517 return (0);
2518
2519 subj = SLOT(cred->cr_label);
2520 obj = SLOT(msqklabel);
2521
2522 if (!biba_dominate_effective(obj, subj))
2523 return (EACCES);
2524
2525 return (0);
2526}
2527
2528static int
2529biba_sysvmsq_check_msqsnd(struct ucred *cred, struct msqid_kernel *msqkptr,
2530 struct label *msqklabel)
2531{
2532 struct mac_biba *subj, *obj;
2533
2534 if (!biba_enabled)
2535 return (0);
2536
2537 subj = SLOT(cred->cr_label);
2538 obj = SLOT(msqklabel);
2539
2540 if (!biba_dominate_effective(subj, obj))
2541 return (EACCES);
2542
2543 return (0);
2544}
2545
2546static int
2547biba_sysvmsq_check_msqrcv(struct ucred *cred, struct msqid_kernel *msqkptr,
2548 struct label *msqklabel)
2549{
2550 struct mac_biba *subj, *obj;
2551
2552 if (!biba_enabled)
2553 return (0);
2554
2555 subj = SLOT(cred->cr_label);
2556 obj = SLOT(msqklabel);
2557
2558 if (!biba_dominate_effective(obj, subj))
2559 return (EACCES);
2560
2561 return (0);
2562}
2563
2564static int
2565biba_sysvmsq_check_msqctl(struct ucred *cred, struct msqid_kernel *msqkptr,
2566 struct label *msqklabel, int cmd)
2567{
2568 struct mac_biba *subj, *obj;
2569
2570 if (!biba_enabled)
2571 return (0);
2572
2573 subj = SLOT(cred->cr_label);
2574 obj = SLOT(msqklabel);
2575
2576 switch(cmd) {
2577 case IPC_RMID:
2578 case IPC_SET:
2579 if (!biba_dominate_effective(subj, obj))
2580 return (EACCES);
2581 break;
2582
2583 case IPC_STAT:
2584 if (!biba_dominate_effective(obj, subj))
2585 return (EACCES);
2586 break;
2587
2588 default:
2589 return (EACCES);
2590 }
2591
2592 return (0);
2593}
2594
2595static void
2596biba_sysvmsq_cleanup(struct label *msqlabel)
2597{
2598
2599 bzero(SLOT(msqlabel), sizeof(struct mac_biba));
2600}
2601
2602static void
2603biba_sysvmsq_create(struct ucred *cred, struct msqid_kernel *msqkptr,
2604 struct label *msqlabel)
2605{
2606 struct mac_biba *source, *dest;
2607
2608 source = SLOT(cred->cr_label);
2609 dest = SLOT(msqlabel);
2610
2611 biba_copy_effective(source, dest);
2612}
2613
2614static int
2615biba_sysvsem_check_semctl(struct ucred *cred, struct semid_kernel *semakptr,
2616 struct label *semaklabel, int cmd)
2617{
2618 struct mac_biba *subj, *obj;
2619
2620 if (!biba_enabled)
2621 return (0);
2622
2623 subj = SLOT(cred->cr_label);
2624 obj = SLOT(semaklabel);
2625
2626 switch(cmd) {
2627 case IPC_RMID:
2628 case IPC_SET:
2629 case SETVAL:
2630 case SETALL:
2631 if (!biba_dominate_effective(subj, obj))
2632 return (EACCES);
2633 break;
2634
2635 case IPC_STAT:
2636 case GETVAL:
2637 case GETPID:
2638 case GETNCNT:
2639 case GETZCNT:
2640 case GETALL:
2641 if (!biba_dominate_effective(obj, subj))
2642 return (EACCES);
2643 break;
2644
2645 default:
2646 return (EACCES);
2647 }
2648
2649 return (0);
2650}
2651
2652static int
2653biba_sysvsem_check_semget(struct ucred *cred, struct semid_kernel *semakptr,
2654 struct label *semaklabel)
2655{
2656 struct mac_biba *subj, *obj;
2657
2658 if (!biba_enabled)
2659 return (0);
2660
2661 subj = SLOT(cred->cr_label);
2662 obj = SLOT(semaklabel);
2663
2664 if (!biba_dominate_effective(obj, subj))
2665 return (EACCES);
2666
2667 return (0);
2668}
2669
2670static int
2671biba_sysvsem_check_semop(struct ucred *cred, struct semid_kernel *semakptr,
2672 struct label *semaklabel, size_t accesstype)
2673{
2674 struct mac_biba *subj, *obj;
2675
2676 if (!biba_enabled)
2677 return (0);
2678
2679 subj = SLOT(cred->cr_label);
2680 obj = SLOT(semaklabel);
2681
2682 if (accesstype & SEM_R)
2683 if (!biba_dominate_effective(obj, subj))
2684 return (EACCES);
2685
2686 if (accesstype & SEM_A)
2687 if (!biba_dominate_effective(subj, obj))
2688 return (EACCES);
2689
2690 return (0);
2691}
2692
2693static void
2694biba_sysvsem_cleanup(struct label *semalabel)
2695{
2696
2697 bzero(SLOT(semalabel), sizeof(struct mac_biba));
2698}
2699
2700static void
2701biba_sysvsem_create(struct ucred *cred, struct semid_kernel *semakptr,
2702 struct label *semalabel)
2703{
2704 struct mac_biba *source, *dest;
2705
2706 source = SLOT(cred->cr_label);
2707 dest = SLOT(semalabel);
2708
2709 biba_copy_effective(source, dest);
2710}
2711
2712static int
2713biba_sysvshm_check_shmat(struct ucred *cred, struct shmid_kernel *shmsegptr,
2714 struct label *shmseglabel, int shmflg)
2715{
2716 struct mac_biba *subj, *obj;
2717
2718 if (!biba_enabled)
2719 return (0);
2720
2721 subj = SLOT(cred->cr_label);
2722 obj = SLOT(shmseglabel);
2723
2724 if (!biba_dominate_effective(obj, subj))
2725 return (EACCES);
2726 if ((shmflg & SHM_RDONLY) == 0) {
2727 if (!biba_dominate_effective(subj, obj))
2728 return (EACCES);
2729 }
2730
2731 return (0);
2732}
2733
2734static int
2735biba_sysvshm_check_shmctl(struct ucred *cred, struct shmid_kernel *shmsegptr,
2736 struct label *shmseglabel, int cmd)
2737{
2738 struct mac_biba *subj, *obj;
2739
2740 if (!biba_enabled)
2741 return (0);
2742
2743 subj = SLOT(cred->cr_label);
2744 obj = SLOT(shmseglabel);
2745
2746 switch(cmd) {
2747 case IPC_RMID:
2748 case IPC_SET:
2749 if (!biba_dominate_effective(subj, obj))
2750 return (EACCES);
2751 break;
2752
2753 case IPC_STAT:
2754 case SHM_STAT:
2755 if (!biba_dominate_effective(obj, subj))
2756 return (EACCES);
2757 break;
2758
2759 default:
2760 return (EACCES);
2761 }
2762
2763 return (0);
2764}
2765
2766static int
2767biba_sysvshm_check_shmget(struct ucred *cred, struct shmid_kernel *shmsegptr,
2768 struct label *shmseglabel, int shmflg)
2769{
2770 struct mac_biba *subj, *obj;
2771
2772 if (!biba_enabled)
2773 return (0);
2774
2775 subj = SLOT(cred->cr_label);
2776 obj = SLOT(shmseglabel);
2777
2778 if (!biba_dominate_effective(obj, subj))
2779 return (EACCES);
2780
2781 return (0);
2782}
2783
2784static void
2785biba_sysvshm_cleanup(struct label *shmlabel)
2786{
2787
2788 bzero(SLOT(shmlabel), sizeof(struct mac_biba));
2789}
2790
2791static void
2792biba_sysvshm_create(struct ucred *cred, struct shmid_kernel *shmsegptr,
2793 struct label *shmlabel)
2794{
2795 struct mac_biba *source, *dest;
2796
2797 source = SLOT(cred->cr_label);
2798 dest = SLOT(shmlabel);
2799
2800 biba_copy_effective(source, dest);
2801}
2802
2803static int
2804biba_vnode_associate_extattr(struct mount *mp, struct label *mplabel,
2805 struct vnode *vp, struct label *vplabel)
2806{
2807 struct mac_biba mb_temp, *source, *dest;
2808 int buflen, error;
2809
2810 source = SLOT(mplabel);
2811 dest = SLOT(vplabel);
2812
2813 buflen = sizeof(mb_temp);
2814 bzero(&mb_temp, buflen);
2815
2816 error = vn_extattr_get(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE,
2817 MAC_BIBA_EXTATTR_NAME, &buflen, (char *) &mb_temp, curthread);
2818 if (error == ENOATTR || error == EOPNOTSUPP) {
2819 /* Fall back to the mntlabel. */
2820 biba_copy_effective(source, dest);
2821 return (0);
2822 } else if (error)
2823 return (error);
2824
2825 if (buflen != sizeof(mb_temp)) {
2826 printf("biba_vnode_associate_extattr: bad size %d\n",
2827 buflen);
2828 return (EPERM);
2829 }
2830 if (biba_valid(&mb_temp) != 0) {
2831 printf("biba_vnode_associate_extattr: invalid\n");
2832 return (EPERM);
2833 }
2834 if ((mb_temp.mb_flags & MAC_BIBA_FLAGS_BOTH) !=
2835 MAC_BIBA_FLAG_EFFECTIVE) {
2836 printf("biba_vnode_associate_extattr: not effective\n");
2837 return (EPERM);
2838 }
2839
2840 biba_copy_effective(&mb_temp, dest);
2841 return (0);
2842}
2843
2844static void
2845biba_vnode_associate_singlelabel(struct mount *mp, struct label *mplabel,
2846 struct vnode *vp, struct label *vplabel)
2847{
2848 struct mac_biba *source, *dest;
2849
2850 source = SLOT(mplabel);
2851 dest = SLOT(vplabel);
2852
2853 biba_copy_effective(source, dest);
2854}
2855
2856static int
2857biba_vnode_check_chdir(struct ucred *cred, struct vnode *dvp,
2858 struct label *dvplabel)
2859{
2860 struct mac_biba *subj, *obj;
2861
2862 if (!biba_enabled)
2863 return (0);
2864
2865 subj = SLOT(cred->cr_label);
2866 obj = SLOT(dvplabel);
2867
2868 if (!biba_dominate_effective(obj, subj))
2869 return (EACCES);
2870
2871 return (0);
2872}
2873
2874static int
2875biba_vnode_check_chroot(struct ucred *cred, struct vnode *dvp,
2876 struct label *dvplabel)
2877{
2878 struct mac_biba *subj, *obj;
2879
2880 if (!biba_enabled)
2881 return (0);
2882
2883 subj = SLOT(cred->cr_label);
2884 obj = SLOT(dvplabel);
2885
2886 if (!biba_dominate_effective(obj, subj))
2887 return (EACCES);
2888
2889 return (0);
2890}
2891
2892static int
2893biba_vnode_check_create(struct ucred *cred, struct vnode *dvp,
2894 struct label *dvplabel, struct componentname *cnp, struct vattr *vap)
2895{
2896 struct mac_biba *subj, *obj;
2897
2898 if (!biba_enabled)
2899 return (0);
2900
2901 subj = SLOT(cred->cr_label);
2902 obj = SLOT(dvplabel);
2903
2904 if (!biba_dominate_effective(subj, obj))
2905 return (EACCES);
2906
2907 return (0);
2908}
2909
2910static int
2911biba_vnode_check_deleteacl(struct ucred *cred, struct vnode *vp,
2912 struct label *vplabel, acl_type_t type)
2913{
2914 struct mac_biba *subj, *obj;
2915
2916 if (!biba_enabled)
2917 return (0);
2918
2919 subj = SLOT(cred->cr_label);
2920 obj = SLOT(vplabel);
2921
2922 if (!biba_dominate_effective(subj, obj))
2923 return (EACCES);
2924
2925 return (0);
2926}
2927
2928static int
2929biba_vnode_check_deleteextattr(struct ucred *cred, struct vnode *vp,
2930 struct label *vplabel, int attrnamespace, const char *name)
2931{
2932 struct mac_biba *subj, *obj;
2933
2934 if (!biba_enabled)
2935 return (0);
2936
2937 subj = SLOT(cred->cr_label);
2938 obj = SLOT(vplabel);
2939
2940 if (!biba_dominate_effective(subj, obj))
2941 return (EACCES);
2942
2943 return (0);
2944}
2945
2946static int
2947biba_vnode_check_exec(struct ucred *cred, struct vnode *vp,
2948 struct label *vplabel, struct image_params *imgp,
2949 struct label *execlabel)
2950{
2951 struct mac_biba *subj, *obj, *exec;
2952 int error;
2953
2954 if (execlabel != NULL) {
2955 /*
2956 * We currently don't permit labels to be changed at
2957 * exec-time as part of Biba, so disallow non-NULL Biba label
2958 * elements in the execlabel.
2959 */
2960 exec = SLOT(execlabel);
2961 error = biba_atmostflags(exec, 0);
2962 if (error)
2963 return (error);
2964 }
2965
2966 if (!biba_enabled)
2967 return (0);
2968
2969 subj = SLOT(cred->cr_label);
2970 obj = SLOT(vplabel);
2971
2972 if (!biba_dominate_effective(obj, subj))
2973 return (EACCES);
2974
2975 return (0);
2976}
2977
2978static int
2979biba_vnode_check_getacl(struct ucred *cred, struct vnode *vp,
2980 struct label *vplabel, acl_type_t type)
2981{
2982 struct mac_biba *subj, *obj;
2983
2984 if (!biba_enabled)
2985 return (0);
2986
2987 subj = SLOT(cred->cr_label);
2988 obj = SLOT(vplabel);
2989
2990 if (!biba_dominate_effective(obj, subj))
2991 return (EACCES);
2992
2993 return (0);
2994}
2995
2996static int
2997biba_vnode_check_getextattr(struct ucred *cred, struct vnode *vp,
2998 struct label *vplabel, int attrnamespace, const char *name)
2999{
3000 struct mac_biba *subj, *obj;
3001
3002 if (!biba_enabled)
3003 return (0);
3004
3005 subj = SLOT(cred->cr_label);
3006 obj = SLOT(vplabel);
3007
3008 if (!biba_dominate_effective(obj, subj))
3009 return (EACCES);
3010
3011 return (0);
3012}
3013
3014static int
3015biba_vnode_check_link(struct ucred *cred, struct vnode *dvp,
3016 struct label *dvplabel, struct vnode *vp, struct label *vplabel,
3017 struct componentname *cnp)
3018{
3019 struct mac_biba *subj, *obj;
3020
3021 if (!biba_enabled)
3022 return (0);
3023
3024 subj = SLOT(cred->cr_label);
3025 obj = SLOT(dvplabel);
3026
3027 if (!biba_dominate_effective(subj, obj))
3028 return (EACCES);
3029
3030 obj = SLOT(vplabel);
3031
3032 if (!biba_dominate_effective(subj, obj))
3033 return (EACCES);
3034
3035 return (0);
3036}
3037
3038static int
3039biba_vnode_check_listextattr(struct ucred *cred, struct vnode *vp,
3040 struct label *vplabel, int attrnamespace)
3041{
3042 struct mac_biba *subj, *obj;
3043
3044 if (!biba_enabled)
3045 return (0);
3046
3047 subj = SLOT(cred->cr_label);
3048 obj = SLOT(vplabel);
3049
3050 if (!biba_dominate_effective(obj, subj))
3051 return (EACCES);
3052
3053 return (0);
3054}
3055
3056static int
3057biba_vnode_check_lookup(struct ucred *cred, struct vnode *dvp,
3058 struct label *dvplabel, struct componentname *cnp)
3059{
3060 struct mac_biba *subj, *obj;
3061
3062 if (!biba_enabled)
3063 return (0);
3064
3065 subj = SLOT(cred->cr_label);
3066 obj = SLOT(dvplabel);
3067
3068 if (!biba_dominate_effective(obj, subj))
3069 return (EACCES);
3070
3071 return (0);
3072}
3073
3074static int
3075biba_vnode_check_mmap(struct ucred *cred, struct vnode *vp,
3076 struct label *vplabel, int prot, int flags)
3077{
3078 struct mac_biba *subj, *obj;
3079
3080 /*
3081 * Rely on the use of open()-time protections to handle
3082 * non-revocation cases.
3083 */
3084 if (!biba_enabled || !revocation_enabled)
3085 return (0);
3086
3087 subj = SLOT(cred->cr_label);
3088 obj = SLOT(vplabel);
3089
3090 if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) {
3091 if (!biba_dominate_effective(obj, subj))
3092 return (EACCES);
3093 }
3094 if (((prot & VM_PROT_WRITE) != 0) && ((flags & MAP_SHARED) != 0)) {
3095 if (!biba_dominate_effective(subj, obj))
3096 return (EACCES);
3097 }
3098
3099 return (0);
3100}
3101
3102static int
3103biba_vnode_check_open(struct ucred *cred, struct vnode *vp,
3104 struct label *vplabel, accmode_t accmode)
3105{
3106 struct mac_biba *subj, *obj;
3107
3108 if (!biba_enabled)
3109 return (0);
3110
3111 subj = SLOT(cred->cr_label);
3112 obj = SLOT(vplabel);
3113
3114 /* XXX privilege override for admin? */
3115 if (accmode & (VREAD | VEXEC | VSTAT_PERMS)) {
3116 if (!biba_dominate_effective(obj, subj))
3117 return (EACCES);
3118 }
3119 if (accmode & VMODIFY_PERMS) {
3120 if (!biba_dominate_effective(subj, obj))
3121 return (EACCES);
3122 }
3123
3124 return (0);
3125}
3126
3127static int
3128biba_vnode_check_poll(struct ucred *active_cred, struct ucred *file_cred,
3129 struct vnode *vp, struct label *vplabel)
3130{
3131 struct mac_biba *subj, *obj;
3132
3133 if (!biba_enabled || !revocation_enabled)
3134 return (0);
3135
3136 subj = SLOT(active_cred->cr_label);
3137 obj = SLOT(vplabel);
3138
3139 if (!biba_dominate_effective(obj, subj))
3140 return (EACCES);
3141
3142 return (0);
3143}
3144
3145static int
3146biba_vnode_check_read(struct ucred *active_cred, struct ucred *file_cred,
3147 struct vnode *vp, struct label *vplabel)
3148{
3149 struct mac_biba *subj, *obj;
3150
3151 if (!biba_enabled || !revocation_enabled)
3152 return (0);
3153
3154 subj = SLOT(active_cred->cr_label);
3155 obj = SLOT(vplabel);
3156
3157 if (!biba_dominate_effective(obj, subj))
3158 return (EACCES);
3159
3160 return (0);
3161}
3162
3163static int
3164biba_vnode_check_readdir(struct ucred *cred, struct vnode *dvp,
3165 struct label *dvplabel)
3166{
3167 struct mac_biba *subj, *obj;
3168
3169 if (!biba_enabled)
3170 return (0);
3171
3172 subj = SLOT(cred->cr_label);
3173 obj = SLOT(dvplabel);
3174
3175 if (!biba_dominate_effective(obj, subj))
3176 return (EACCES);
3177
3178 return (0);
3179}
3180
3181static int
3182biba_vnode_check_readlink(struct ucred *cred, struct vnode *vp,
3183 struct label *vplabel)
3184{
3185 struct mac_biba *subj, *obj;
3186
3187 if (!biba_enabled)
3188 return (0);
3189
3190 subj = SLOT(cred->cr_label);
3191 obj = SLOT(vplabel);
3192
3193 if (!biba_dominate_effective(obj, subj))
3194 return (EACCES);
3195
3196 return (0);
3197}
3198
3199static int
3200biba_vnode_check_relabel(struct ucred *cred, struct vnode *vp,
3201 struct label *vplabel, struct label *newlabel)
3202{
3203 struct mac_biba *old, *new, *subj;
3204 int error;
3205
3206 old = SLOT(vplabel);
3207 new = SLOT(newlabel);
3208 subj = SLOT(cred->cr_label);
3209
3210 /*
3211 * If there is a Biba label update for the vnode, it must be a
3212 * effective label.
3213 */
3214 error = biba_atmostflags(new, MAC_BIBA_FLAG_EFFECTIVE);
3215 if (error)
3216 return (error);
3217
3218 /*
3219 * To perform a relabel of the vnode (Biba label or not), Biba must
3220 * authorize the relabel.
3221 */
3222 if (!biba_effective_in_range(old, subj))
3223 return (EPERM);
3224
3225 /*
3226 * If the Biba label is to be changed, authorize as appropriate.
3227 */
3228 if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) {
3229 /*
3230 * To change the Biba label on a vnode, the new vnode label
3231 * must be in the subject range.
3232 */
3233 if (!biba_effective_in_range(new, subj))
3234 return (EPERM);
3235
3236 /*
3237 * To change the Biba label on the vnode to be EQUAL, the
3238 * subject must have appropriate privilege.
3239 */
3240 if (biba_contains_equal(new)) {
3241 error = biba_subject_privileged(subj);
3242 if (error)
3243 return (error);
3244 }
3245 }
3246
3247 return (0);
3248}
3249
3250static int
3251biba_vnode_check_rename_from(struct ucred *cred, struct vnode *dvp,
3252 struct label *dvplabel, struct vnode *vp, struct label *vplabel,
3253 struct componentname *cnp)
3254{
3255 struct mac_biba *subj, *obj;
3256
3257 if (!biba_enabled)
3258 return (0);
3259
3260 subj = SLOT(cred->cr_label);
3261 obj = SLOT(dvplabel);
3262
3263 if (!biba_dominate_effective(subj, obj))
3264 return (EACCES);
3265
3266 obj = SLOT(vplabel);
3267
3268 if (!biba_dominate_effective(subj, obj))
3269 return (EACCES);
3270
3271 return (0);
3272}
3273
3274static int
3275biba_vnode_check_rename_to(struct ucred *cred, struct vnode *dvp,
3276 struct label *dvplabel, struct vnode *vp, struct label *vplabel,
3277 int samedir, struct componentname *cnp)
3278{
3279 struct mac_biba *subj, *obj;
3280
3281 if (!biba_enabled)
3282 return (0);
3283
3284 subj = SLOT(cred->cr_label);
3285 obj = SLOT(dvplabel);
3286
3287 if (!biba_dominate_effective(subj, obj))
3288 return (EACCES);
3289
3290 if (vp != NULL) {
3291 obj = SLOT(vplabel);
3292
3293 if (!biba_dominate_effective(subj, obj))
3294 return (EACCES);
3295 }
3296
3297 return (0);
3298}
3299
3300static int
3301biba_vnode_check_revoke(struct ucred *cred, struct vnode *vp,
3302 struct label *vplabel)
3303{
3304 struct mac_biba *subj, *obj;
3305
3306 if (!biba_enabled)
3307 return (0);
3308
3309 subj = SLOT(cred->cr_label);
3310 obj = SLOT(vplabel);
3311
3312 if (!biba_dominate_effective(subj, obj))
3313 return (EACCES);
3314
3315 return (0);
3316}
3317
3318static int
3319biba_vnode_check_setacl(struct ucred *cred, struct vnode *vp,
3320 struct label *vplabel, acl_type_t type, struct acl *acl)
3321{
3322 struct mac_biba *subj, *obj;
3323
3324 if (!biba_enabled)
3325 return (0);
3326
3327 subj = SLOT(cred->cr_label);
3328 obj = SLOT(vplabel);
3329
3330 if (!biba_dominate_effective(subj, obj))
3331 return (EACCES);
3332
3333 return (0);
3334}
3335
3336static int
3337biba_vnode_check_setextattr(struct ucred *cred, struct vnode *vp,
3338 struct label *vplabel, int attrnamespace, const char *name)
3339{
3340 struct mac_biba *subj, *obj;
3341
3342 if (!biba_enabled)
3343 return (0);
3344
3345 subj = SLOT(cred->cr_label);
3346 obj = SLOT(vplabel);
3347
3348 if (!biba_dominate_effective(subj, obj))
3349 return (EACCES);
3350
3351 /* XXX: protect the MAC EA in a special way? */
3352
3353 return (0);
3354}
3355
3356static int
3357biba_vnode_check_setflags(struct ucred *cred, struct vnode *vp,
3358 struct label *vplabel, u_long flags)
3359{
3360 struct mac_biba *subj, *obj;
3361
3362 if (!biba_enabled)
3363 return (0);
3364
3365 subj = SLOT(cred->cr_label);
3366 obj = SLOT(vplabel);
3367
3368 if (!biba_dominate_effective(subj, obj))
3369 return (EACCES);
3370
3371 return (0);
3372}
3373
3374static int
3375biba_vnode_check_setmode(struct ucred *cred, struct vnode *vp,
3376 struct label *vplabel, mode_t mode)
3377{
3378 struct mac_biba *subj, *obj;
3379
3380 if (!biba_enabled)
3381 return (0);
3382
3383 subj = SLOT(cred->cr_label);
3384 obj = SLOT(vplabel);
3385
3386 if (!biba_dominate_effective(subj, obj))
3387 return (EACCES);
3388
3389 return (0);
3390}
3391
3392static int
3393biba_vnode_check_setowner(struct ucred *cred, struct vnode *vp,
3394 struct label *vplabel, uid_t uid, gid_t gid)
3395{
3396 struct mac_biba *subj, *obj;
3397
3398 if (!biba_enabled)
3399 return (0);
3400
3401 subj = SLOT(cred->cr_label);
3402 obj = SLOT(vplabel);
3403
3404 if (!biba_dominate_effective(subj, obj))
3405 return (EACCES);
3406
3407 return (0);
3408}
3409
3410static int
3411biba_vnode_check_setutimes(struct ucred *cred, struct vnode *vp,
3412 struct label *vplabel, struct timespec atime, struct timespec mtime)
3413{
3414 struct mac_biba *subj, *obj;
3415
3416 if (!biba_enabled)
3417 return (0);
3418
3419 subj = SLOT(cred->cr_label);
3420 obj = SLOT(vplabel);
3421
3422 if (!biba_dominate_effective(subj, obj))
3423 return (EACCES);
3424
3425 return (0);
3426}
3427
3428static int
3429biba_vnode_check_stat(struct ucred *active_cred, struct ucred *file_cred,
3430 struct vnode *vp, struct label *vplabel)
3431{
3432 struct mac_biba *subj, *obj;
3433
3434 if (!biba_enabled)
3435 return (0);
3436
3437 subj = SLOT(active_cred->cr_label);
3438 obj = SLOT(vplabel);
3439
3440 if (!biba_dominate_effective(obj, subj))
3441 return (EACCES);
3442
3443 return (0);
3444}
3445
3446static int
3447biba_vnode_check_unlink(struct ucred *cred, struct vnode *dvp,
3448 struct label *dvplabel, struct vnode *vp, struct label *vplabel,
3449 struct componentname *cnp)
3450{
3451 struct mac_biba *subj, *obj;
3452
3453 if (!biba_enabled)
3454 return (0);
3455
3456 subj = SLOT(cred->cr_label);
3457 obj = SLOT(dvplabel);
3458
3459 if (!biba_dominate_effective(subj, obj))
3460 return (EACCES);
3461
3462 obj = SLOT(vplabel);
3463
3464 if (!biba_dominate_effective(subj, obj))
3465 return (EACCES);
3466
3467 return (0);
3468}
3469
3470static int
3471biba_vnode_check_write(struct ucred *active_cred,
3472 struct ucred *file_cred, struct vnode *vp, struct label *vplabel)
3473{
3474 struct mac_biba *subj, *obj;
3475
3476 if (!biba_enabled || !revocation_enabled)
3477 return (0);
3478
3479 subj = SLOT(active_cred->cr_label);
3480 obj = SLOT(vplabel);
3481
3482 if (!biba_dominate_effective(subj, obj))
3483 return (EACCES);
3484
3485 return (0);
3486}
3487
3488static int
3489biba_vnode_create_extattr(struct ucred *cred, struct mount *mp,
3490 struct label *mplabel, struct vnode *dvp, struct label *dvplabel,
3491 struct vnode *vp, struct label *vplabel, struct componentname *cnp)
3492{
3493 struct mac_biba *source, *dest, mb_temp;
3494 size_t buflen;
3495 int error;
3496
3497 buflen = sizeof(mb_temp);
3498 bzero(&mb_temp, buflen);
3499
3500 source = SLOT(cred->cr_label);
3501 dest = SLOT(vplabel);
3502 biba_copy_effective(source, &mb_temp);
3503
3504 error = vn_extattr_set(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE,
3505 MAC_BIBA_EXTATTR_NAME, buflen, (char *) &mb_temp, curthread);
3506 if (error == 0)
3507 biba_copy_effective(source, dest);
3508 return (error);
3509}
3510
3511static void
3512biba_vnode_relabel(struct ucred *cred, struct vnode *vp,
3513 struct label *vplabel, struct label *newlabel)
3514{
3515 struct mac_biba *source, *dest;
3516
3517 source = SLOT(newlabel);
3518 dest = SLOT(vplabel);
3519
3520 biba_copy(source, dest);
3521}
3522
3523static int
3524biba_vnode_setlabel_extattr(struct ucred *cred, struct vnode *vp,
3525 struct label *vplabel, struct label *intlabel)
3526{
3527 struct mac_biba *source, mb_temp;
3528 size_t buflen;
3529 int error;
3530
3531 buflen = sizeof(mb_temp);
3532 bzero(&mb_temp, buflen);
3533
3534 source = SLOT(intlabel);
3535 if ((source->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) == 0)
3536 return (0);
3537
3538 biba_copy_effective(source, &mb_temp);
3539
3540 error = vn_extattr_set(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE,
3541 MAC_BIBA_EXTATTR_NAME, buflen, (char *) &mb_temp, curthread);
3542 return (error);
3543}
3544
3545static struct mac_policy_ops mac_biba_ops =
3546{
3547 .mpo_init = biba_init,
3548
3549 .mpo_bpfdesc_check_receive = biba_bpfdesc_check_receive,
3550 .mpo_bpfdesc_create = biba_bpfdesc_create,
3551 .mpo_bpfdesc_create_mbuf = biba_bpfdesc_create_mbuf,
3552 .mpo_bpfdesc_destroy_label = biba_destroy_label,
3553 .mpo_bpfdesc_init_label = biba_init_label,
3554
3555 .mpo_cred_associate_nfsd = biba_cred_associate_nfsd,
3556 .mpo_cred_check_relabel = biba_cred_check_relabel,
3557 .mpo_cred_check_visible = biba_cred_check_visible,
3558 .mpo_cred_copy_label = biba_copy_label,
3559 .mpo_cred_create_init = biba_cred_create_init,
3560 .mpo_cred_create_swapper = biba_cred_create_swapper,
3561 .mpo_cred_destroy_label = biba_destroy_label,
3562 .mpo_cred_externalize_label = biba_externalize_label,
3563 .mpo_cred_init_label = biba_init_label,
3564 .mpo_cred_internalize_label = biba_internalize_label,
3565 .mpo_cred_relabel = biba_cred_relabel,
3566
3567 .mpo_devfs_create_device = biba_devfs_create_device,
3568 .mpo_devfs_create_directory = biba_devfs_create_directory,
3569 .mpo_devfs_create_symlink = biba_devfs_create_symlink,
3570 .mpo_devfs_destroy_label = biba_destroy_label,
3571 .mpo_devfs_init_label = biba_init_label,
3572 .mpo_devfs_update = biba_devfs_update,
3573 .mpo_devfs_vnode_associate = biba_devfs_vnode_associate,
3574
3575 .mpo_ifnet_check_relabel = biba_ifnet_check_relabel,
3576 .mpo_ifnet_check_transmit = biba_ifnet_check_transmit,
3577 .mpo_ifnet_copy_label = biba_copy_label,
3578 .mpo_ifnet_create = biba_ifnet_create,
3579 .mpo_ifnet_create_mbuf = biba_ifnet_create_mbuf,
3580 .mpo_ifnet_destroy_label = biba_destroy_label,
3581 .mpo_ifnet_externalize_label = biba_externalize_label,
3582 .mpo_ifnet_init_label = biba_init_label,
3583 .mpo_ifnet_internalize_label = biba_internalize_label,
3584 .mpo_ifnet_relabel = biba_ifnet_relabel,
3585
3586 .mpo_inpcb_check_deliver = biba_inpcb_check_deliver,
3587 .mpo_inpcb_check_visible = biba_inpcb_check_visible,
3588 .mpo_inpcb_create = biba_inpcb_create,
3589 .mpo_inpcb_create_mbuf = biba_inpcb_create_mbuf,
3590 .mpo_inpcb_destroy_label = biba_destroy_label,
3591 .mpo_inpcb_init_label = biba_init_label_waitcheck,
3592 .mpo_inpcb_sosetlabel = biba_inpcb_sosetlabel,
3593
3594 .mpo_ip6q_create = biba_ip6q_create,
3595 .mpo_ip6q_destroy_label = biba_destroy_label,
3596 .mpo_ip6q_init_label = biba_init_label_waitcheck,
3597 .mpo_ip6q_match = biba_ip6q_match,
3598 .mpo_ip6q_reassemble = biba_ip6q_reassemble,
3599 .mpo_ip6q_update = biba_ip6q_update,
3600
3601 .mpo_ipq_create = biba_ipq_create,
3602 .mpo_ipq_destroy_label = biba_destroy_label,
3603 .mpo_ipq_init_label = biba_init_label_waitcheck,
3604 .mpo_ipq_match = biba_ipq_match,
3605 .mpo_ipq_reassemble = biba_ipq_reassemble,
3606 .mpo_ipq_update = biba_ipq_update,
3607
3608 .mpo_kld_check_load = biba_kld_check_load,
3609
3610 .mpo_mbuf_copy_label = biba_copy_label,
3611 .mpo_mbuf_destroy_label = biba_destroy_label,
3612 .mpo_mbuf_init_label = biba_init_label_waitcheck,
3613
3614 .mpo_mount_check_stat = biba_mount_check_stat,
3615 .mpo_mount_create = biba_mount_create,
3616 .mpo_mount_destroy_label = biba_destroy_label,
3617 .mpo_mount_init_label = biba_init_label,
3618
3619 .mpo_netatalk_aarp_send = biba_netatalk_aarp_send,
3620
3621 .mpo_netinet_arp_send = biba_netinet_arp_send,
3622 .mpo_netinet_firewall_reply = biba_netinet_firewall_reply,
3623 .mpo_netinet_firewall_send = biba_netinet_firewall_send,
3624 .mpo_netinet_fragment = biba_netinet_fragment,
3625 .mpo_netinet_icmp_reply = biba_netinet_icmp_reply,
3626 .mpo_netinet_igmp_send = biba_netinet_igmp_send,
3627
3628 .mpo_netinet6_nd6_send = biba_netinet6_nd6_send,
3629
3630 .mpo_pipe_check_ioctl = biba_pipe_check_ioctl,
3631 .mpo_pipe_check_poll = biba_pipe_check_poll,
3632 .mpo_pipe_check_read = biba_pipe_check_read,
3633 .mpo_pipe_check_relabel = biba_pipe_check_relabel,
3634 .mpo_pipe_check_stat = biba_pipe_check_stat,
3635 .mpo_pipe_check_write = biba_pipe_check_write,
3636 .mpo_pipe_copy_label = biba_copy_label,
3637 .mpo_pipe_create = biba_pipe_create,
3638 .mpo_pipe_destroy_label = biba_destroy_label,
3639 .mpo_pipe_externalize_label = biba_externalize_label,
3640 .mpo_pipe_init_label = biba_init_label,
3641 .mpo_pipe_internalize_label = biba_internalize_label,
3642 .mpo_pipe_relabel = biba_pipe_relabel,
3643
3644 .mpo_posixsem_check_getvalue = biba_posixsem_check_rdonly,
3645 .mpo_posixsem_check_open = biba_posixsem_check_openunlink,
3646 .mpo_posixsem_check_post = biba_posixsem_check_write,
|
| 3647 .mpo_posixsem_check_setmode = biba_posixsem_check_setmode,
3648 .mpo_posixsem_check_setowner = biba_posixsem_check_setowner,
|
3458 .mpo_posixsem_check_stat = biba_posixsem_check_rdonly,
3459 .mpo_posixsem_check_unlink = biba_posixsem_check_openunlink,
3460 .mpo_posixsem_check_wait = biba_posixsem_check_write,
3461 .mpo_posixsem_create = biba_posixsem_create,
3462 .mpo_posixsem_destroy_label = biba_destroy_label,
3463 .mpo_posixsem_init_label = biba_init_label,
3464
| 3649 .mpo_posixsem_check_stat = biba_posixsem_check_rdonly,
3650 .mpo_posixsem_check_unlink = biba_posixsem_check_openunlink,
3651 .mpo_posixsem_check_wait = biba_posixsem_check_write,
3652 .mpo_posixsem_create = biba_posixsem_create,
3653 .mpo_posixsem_destroy_label = biba_destroy_label,
3654 .mpo_posixsem_init_label = biba_init_label,
3655
|
| 3656 .mpo_posixshm_check_mmap = biba_posixshm_check_mmap,
3657 .mpo_posixshm_check_open = biba_posixshm_check_open,
3658 .mpo_posixshm_check_setmode = biba_posixshm_check_setmode,
3659 .mpo_posixshm_check_setowner = biba_posixshm_check_setowner,
3660 .mpo_posixshm_check_stat = biba_posixshm_check_stat,
3661 .mpo_posixshm_check_truncate = biba_posixshm_check_truncate,
3662 .mpo_posixshm_check_unlink = biba_posixshm_check_unlink,
3663 .mpo_posixshm_create = biba_posixshm_create,
3664 .mpo_posixshm_destroy_label = biba_destroy_label,
3665 .mpo_posixshm_init_label = biba_init_label,
3666
|
3465 .mpo_priv_check = biba_priv_check,
3466
3467 .mpo_proc_check_debug = biba_proc_check_debug,
3468 .mpo_proc_check_sched = biba_proc_check_sched,
3469 .mpo_proc_check_signal = biba_proc_check_signal,
3470
3471 .mpo_socket_check_deliver = biba_socket_check_deliver,
3472 .mpo_socket_check_relabel = biba_socket_check_relabel,
3473 .mpo_socket_check_visible = biba_socket_check_visible,
3474 .mpo_socket_copy_label = biba_copy_label,
3475 .mpo_socket_create = biba_socket_create,
3476 .mpo_socket_create_mbuf = biba_socket_create_mbuf,
3477 .mpo_socket_destroy_label = biba_destroy_label,
3478 .mpo_socket_externalize_label = biba_externalize_label,
3479 .mpo_socket_init_label = biba_init_label_waitcheck,
3480 .mpo_socket_internalize_label = biba_internalize_label,
3481 .mpo_socket_newconn = biba_socket_newconn,
3482 .mpo_socket_relabel = biba_socket_relabel,
3483
3484 .mpo_socketpeer_destroy_label = biba_destroy_label,
3485 .mpo_socketpeer_externalize_label = biba_externalize_label,
3486 .mpo_socketpeer_init_label = biba_init_label_waitcheck,
3487 .mpo_socketpeer_set_from_mbuf = biba_socketpeer_set_from_mbuf,
3488 .mpo_socketpeer_set_from_socket = biba_socketpeer_set_from_socket,
3489
3490 .mpo_syncache_create = biba_syncache_create,
3491 .mpo_syncache_create_mbuf = biba_syncache_create_mbuf,
3492 .mpo_syncache_destroy_label = biba_destroy_label,
3493 .mpo_syncache_init_label = biba_init_label_waitcheck,
3494
3495 .mpo_system_check_acct = biba_system_check_acct,
3496 .mpo_system_check_auditctl = biba_system_check_auditctl,
3497 .mpo_system_check_auditon = biba_system_check_auditon,
3498 .mpo_system_check_swapoff = biba_system_check_swapoff,
3499 .mpo_system_check_swapon = biba_system_check_swapon,
3500 .mpo_system_check_sysctl = biba_system_check_sysctl,
3501
3502 .mpo_sysvmsg_cleanup = biba_sysvmsg_cleanup,
3503 .mpo_sysvmsg_create = biba_sysvmsg_create,
3504 .mpo_sysvmsg_destroy_label = biba_destroy_label,
3505 .mpo_sysvmsg_init_label = biba_init_label,
3506
3507 .mpo_sysvmsq_check_msgrcv = biba_sysvmsq_check_msgrcv,
3508 .mpo_sysvmsq_check_msgrmid = biba_sysvmsq_check_msgrmid,
3509 .mpo_sysvmsq_check_msqget = biba_sysvmsq_check_msqget,
3510 .mpo_sysvmsq_check_msqsnd = biba_sysvmsq_check_msqsnd,
3511 .mpo_sysvmsq_check_msqrcv = biba_sysvmsq_check_msqrcv,
3512 .mpo_sysvmsq_check_msqctl = biba_sysvmsq_check_msqctl,
3513 .mpo_sysvmsq_cleanup = biba_sysvmsq_cleanup,
3514 .mpo_sysvmsq_create = biba_sysvmsq_create,
3515 .mpo_sysvmsq_destroy_label = biba_destroy_label,
3516 .mpo_sysvmsq_init_label = biba_init_label,
3517
3518 .mpo_sysvsem_check_semctl = biba_sysvsem_check_semctl,
3519 .mpo_sysvsem_check_semget = biba_sysvsem_check_semget,
3520 .mpo_sysvsem_check_semop = biba_sysvsem_check_semop,
3521 .mpo_sysvsem_cleanup = biba_sysvsem_cleanup,
3522 .mpo_sysvsem_create = biba_sysvsem_create,
3523 .mpo_sysvsem_destroy_label = biba_destroy_label,
3524 .mpo_sysvsem_init_label = biba_init_label,
3525
3526 .mpo_sysvshm_check_shmat = biba_sysvshm_check_shmat,
3527 .mpo_sysvshm_check_shmctl = biba_sysvshm_check_shmctl,
3528 .mpo_sysvshm_check_shmget = biba_sysvshm_check_shmget,
3529 .mpo_sysvshm_cleanup = biba_sysvshm_cleanup,
3530 .mpo_sysvshm_create = biba_sysvshm_create,
3531 .mpo_sysvshm_destroy_label = biba_destroy_label,
3532 .mpo_sysvshm_init_label = biba_init_label,
3533
3534 .mpo_vnode_associate_extattr = biba_vnode_associate_extattr,
3535 .mpo_vnode_associate_singlelabel = biba_vnode_associate_singlelabel,
3536 .mpo_vnode_check_access = biba_vnode_check_open,
3537 .mpo_vnode_check_chdir = biba_vnode_check_chdir,
3538 .mpo_vnode_check_chroot = biba_vnode_check_chroot,
3539 .mpo_vnode_check_create = biba_vnode_check_create,
3540 .mpo_vnode_check_deleteacl = biba_vnode_check_deleteacl,
3541 .mpo_vnode_check_deleteextattr = biba_vnode_check_deleteextattr,
3542 .mpo_vnode_check_exec = biba_vnode_check_exec,
3543 .mpo_vnode_check_getacl = biba_vnode_check_getacl,
3544 .mpo_vnode_check_getextattr = biba_vnode_check_getextattr,
3545 .mpo_vnode_check_link = biba_vnode_check_link,
3546 .mpo_vnode_check_listextattr = biba_vnode_check_listextattr,
3547 .mpo_vnode_check_lookup = biba_vnode_check_lookup,
3548 .mpo_vnode_check_mmap = biba_vnode_check_mmap,
3549 .mpo_vnode_check_open = biba_vnode_check_open,
3550 .mpo_vnode_check_poll = biba_vnode_check_poll,
3551 .mpo_vnode_check_read = biba_vnode_check_read,
3552 .mpo_vnode_check_readdir = biba_vnode_check_readdir,
3553 .mpo_vnode_check_readlink = biba_vnode_check_readlink,
3554 .mpo_vnode_check_relabel = biba_vnode_check_relabel,
3555 .mpo_vnode_check_rename_from = biba_vnode_check_rename_from,
3556 .mpo_vnode_check_rename_to = biba_vnode_check_rename_to,
3557 .mpo_vnode_check_revoke = biba_vnode_check_revoke,
3558 .mpo_vnode_check_setacl = biba_vnode_check_setacl,
3559 .mpo_vnode_check_setextattr = biba_vnode_check_setextattr,
3560 .mpo_vnode_check_setflags = biba_vnode_check_setflags,
3561 .mpo_vnode_check_setmode = biba_vnode_check_setmode,
3562 .mpo_vnode_check_setowner = biba_vnode_check_setowner,
3563 .mpo_vnode_check_setutimes = biba_vnode_check_setutimes,
3564 .mpo_vnode_check_stat = biba_vnode_check_stat,
3565 .mpo_vnode_check_unlink = biba_vnode_check_unlink,
3566 .mpo_vnode_check_write = biba_vnode_check_write,
3567 .mpo_vnode_create_extattr = biba_vnode_create_extattr,
3568 .mpo_vnode_copy_label = biba_copy_label,
3569 .mpo_vnode_destroy_label = biba_destroy_label,
3570 .mpo_vnode_externalize_label = biba_externalize_label,
3571 .mpo_vnode_init_label = biba_init_label,
3572 .mpo_vnode_internalize_label = biba_internalize_label,
3573 .mpo_vnode_relabel = biba_vnode_relabel,
3574 .mpo_vnode_setlabel_extattr = biba_vnode_setlabel_extattr,
3575};
3576
3577MAC_POLICY_SET(&mac_biba_ops, mac_biba, "TrustedBSD MAC/Biba",
3578 MPC_LOADTIME_FLAG_NOTLATE, &biba_slot);
| 3667 .mpo_priv_check = biba_priv_check,
3668
3669 .mpo_proc_check_debug = biba_proc_check_debug,
3670 .mpo_proc_check_sched = biba_proc_check_sched,
3671 .mpo_proc_check_signal = biba_proc_check_signal,
3672
3673 .mpo_socket_check_deliver = biba_socket_check_deliver,
3674 .mpo_socket_check_relabel = biba_socket_check_relabel,
3675 .mpo_socket_check_visible = biba_socket_check_visible,
3676 .mpo_socket_copy_label = biba_copy_label,
3677 .mpo_socket_create = biba_socket_create,
3678 .mpo_socket_create_mbuf = biba_socket_create_mbuf,
3679 .mpo_socket_destroy_label = biba_destroy_label,
3680 .mpo_socket_externalize_label = biba_externalize_label,
3681 .mpo_socket_init_label = biba_init_label_waitcheck,
3682 .mpo_socket_internalize_label = biba_internalize_label,
3683 .mpo_socket_newconn = biba_socket_newconn,
3684 .mpo_socket_relabel = biba_socket_relabel,
3685
3686 .mpo_socketpeer_destroy_label = biba_destroy_label,
3687 .mpo_socketpeer_externalize_label = biba_externalize_label,
3688 .mpo_socketpeer_init_label = biba_init_label_waitcheck,
3689 .mpo_socketpeer_set_from_mbuf = biba_socketpeer_set_from_mbuf,
3690 .mpo_socketpeer_set_from_socket = biba_socketpeer_set_from_socket,
3691
3692 .mpo_syncache_create = biba_syncache_create,
3693 .mpo_syncache_create_mbuf = biba_syncache_create_mbuf,
3694 .mpo_syncache_destroy_label = biba_destroy_label,
3695 .mpo_syncache_init_label = biba_init_label_waitcheck,
3696
3697 .mpo_system_check_acct = biba_system_check_acct,
3698 .mpo_system_check_auditctl = biba_system_check_auditctl,
3699 .mpo_system_check_auditon = biba_system_check_auditon,
3700 .mpo_system_check_swapoff = biba_system_check_swapoff,
3701 .mpo_system_check_swapon = biba_system_check_swapon,
3702 .mpo_system_check_sysctl = biba_system_check_sysctl,
3703
3704 .mpo_sysvmsg_cleanup = biba_sysvmsg_cleanup,
3705 .mpo_sysvmsg_create = biba_sysvmsg_create,
3706 .mpo_sysvmsg_destroy_label = biba_destroy_label,
3707 .mpo_sysvmsg_init_label = biba_init_label,
3708
3709 .mpo_sysvmsq_check_msgrcv = biba_sysvmsq_check_msgrcv,
3710 .mpo_sysvmsq_check_msgrmid = biba_sysvmsq_check_msgrmid,
3711 .mpo_sysvmsq_check_msqget = biba_sysvmsq_check_msqget,
3712 .mpo_sysvmsq_check_msqsnd = biba_sysvmsq_check_msqsnd,
3713 .mpo_sysvmsq_check_msqrcv = biba_sysvmsq_check_msqrcv,
3714 .mpo_sysvmsq_check_msqctl = biba_sysvmsq_check_msqctl,
3715 .mpo_sysvmsq_cleanup = biba_sysvmsq_cleanup,
3716 .mpo_sysvmsq_create = biba_sysvmsq_create,
3717 .mpo_sysvmsq_destroy_label = biba_destroy_label,
3718 .mpo_sysvmsq_init_label = biba_init_label,
3719
3720 .mpo_sysvsem_check_semctl = biba_sysvsem_check_semctl,
3721 .mpo_sysvsem_check_semget = biba_sysvsem_check_semget,
3722 .mpo_sysvsem_check_semop = biba_sysvsem_check_semop,
3723 .mpo_sysvsem_cleanup = biba_sysvsem_cleanup,
3724 .mpo_sysvsem_create = biba_sysvsem_create,
3725 .mpo_sysvsem_destroy_label = biba_destroy_label,
3726 .mpo_sysvsem_init_label = biba_init_label,
3727
3728 .mpo_sysvshm_check_shmat = biba_sysvshm_check_shmat,
3729 .mpo_sysvshm_check_shmctl = biba_sysvshm_check_shmctl,
3730 .mpo_sysvshm_check_shmget = biba_sysvshm_check_shmget,
3731 .mpo_sysvshm_cleanup = biba_sysvshm_cleanup,
3732 .mpo_sysvshm_create = biba_sysvshm_create,
3733 .mpo_sysvshm_destroy_label = biba_destroy_label,
3734 .mpo_sysvshm_init_label = biba_init_label,
3735
3736 .mpo_vnode_associate_extattr = biba_vnode_associate_extattr,
3737 .mpo_vnode_associate_singlelabel = biba_vnode_associate_singlelabel,
3738 .mpo_vnode_check_access = biba_vnode_check_open,
3739 .mpo_vnode_check_chdir = biba_vnode_check_chdir,
3740 .mpo_vnode_check_chroot = biba_vnode_check_chroot,
3741 .mpo_vnode_check_create = biba_vnode_check_create,
3742 .mpo_vnode_check_deleteacl = biba_vnode_check_deleteacl,
3743 .mpo_vnode_check_deleteextattr = biba_vnode_check_deleteextattr,
3744 .mpo_vnode_check_exec = biba_vnode_check_exec,
3745 .mpo_vnode_check_getacl = biba_vnode_check_getacl,
3746 .mpo_vnode_check_getextattr = biba_vnode_check_getextattr,
3747 .mpo_vnode_check_link = biba_vnode_check_link,
3748 .mpo_vnode_check_listextattr = biba_vnode_check_listextattr,
3749 .mpo_vnode_check_lookup = biba_vnode_check_lookup,
3750 .mpo_vnode_check_mmap = biba_vnode_check_mmap,
3751 .mpo_vnode_check_open = biba_vnode_check_open,
3752 .mpo_vnode_check_poll = biba_vnode_check_poll,
3753 .mpo_vnode_check_read = biba_vnode_check_read,
3754 .mpo_vnode_check_readdir = biba_vnode_check_readdir,
3755 .mpo_vnode_check_readlink = biba_vnode_check_readlink,
3756 .mpo_vnode_check_relabel = biba_vnode_check_relabel,
3757 .mpo_vnode_check_rename_from = biba_vnode_check_rename_from,
3758 .mpo_vnode_check_rename_to = biba_vnode_check_rename_to,
3759 .mpo_vnode_check_revoke = biba_vnode_check_revoke,
3760 .mpo_vnode_check_setacl = biba_vnode_check_setacl,
3761 .mpo_vnode_check_setextattr = biba_vnode_check_setextattr,
3762 .mpo_vnode_check_setflags = biba_vnode_check_setflags,
3763 .mpo_vnode_check_setmode = biba_vnode_check_setmode,
3764 .mpo_vnode_check_setowner = biba_vnode_check_setowner,
3765 .mpo_vnode_check_setutimes = biba_vnode_check_setutimes,
3766 .mpo_vnode_check_stat = biba_vnode_check_stat,
3767 .mpo_vnode_check_unlink = biba_vnode_check_unlink,
3768 .mpo_vnode_check_write = biba_vnode_check_write,
3769 .mpo_vnode_create_extattr = biba_vnode_create_extattr,
3770 .mpo_vnode_copy_label = biba_copy_label,
3771 .mpo_vnode_destroy_label = biba_destroy_label,
3772 .mpo_vnode_externalize_label = biba_externalize_label,
3773 .mpo_vnode_init_label = biba_init_label,
3774 .mpo_vnode_internalize_label = biba_internalize_label,
3775 .mpo_vnode_relabel = biba_vnode_relabel,
3776 .mpo_vnode_setlabel_extattr = biba_vnode_setlabel_extattr,
3777};
3778
3779MAC_POLICY_SET(&mac_biba_ops, mac_biba, "TrustedBSD MAC/Biba",
3780 MPC_LOADTIME_FLAG_NOTLATE, &biba_slot);
|