1 /*-
2 * Copyright (c) 1999-2002, 2007-2011 Robert N. M. Watson
3 * Copyright (c) 2001-2005 McAfee, Inc.
4 * Copyright (c) 2006 SPARTA, Inc.
5 * All rights reserved.
6 *
7 * This software was developed by Robert Watson for the TrustedBSD Project.
8 *
9 * This software was developed for the FreeBSD Project in part by McAfee
10 * Research, the Security Research Division of McAfee, Inc. under
11 * DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA
12 * CHATS research program.
13 *
14 * This software was enhanced by SPARTA ISSO under SPAWAR contract
15 * N66001-04-C-6019 ("SEFOS").
16 *
17 * This software was developed at the University of Cambridge Computer
18 * Laboratory with support from a grant from Google, Inc.
19 *
20 * Redistribution and use in source and binary forms, with or without
21 * modification, are permitted provided that the following conditions
22 * are met:
23 * 1. Redistributions of source code must retain the above copyright
24 * notice, this list of conditions and the following disclaimer.
25 * 2. Redistributions in binary form must reproduce the above copyright
26 * notice, this list of conditions and the following disclaimer in the
27 * documentation and/or other materials provided with the distribution.
28 *
29 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
30 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
31 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
32 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
33 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
34 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
35 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
37 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
38 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
39 * SUCH DAMAGE.
40 */
41
42 /*
43 * Developed by the TrustedBSD Project.
44 *
45 * Biba fixed label mandatory integrity policy.
46 */
47
48 #include <sys/param.h>
49 #include <sys/conf.h>
50 #include <sys/extattr.h>
51 #include <sys/kernel.h>
52 #include <sys/ksem.h>
53 #include <sys/malloc.h>
54 #include <sys/mman.h>
55 #include <sys/mount.h>
56 #include <sys/priv.h>
57 #include <sys/proc.h>
58 #include <sys/sbuf.h>
59 #include <sys/systm.h>
60 #include <sys/sysproto.h>
61 #include <sys/sysent.h>
62 #include <sys/systm.h>
63 #include <sys/vnode.h>
64 #include <sys/file.h>
65 #include <sys/socket.h>
66 #include <sys/socketvar.h>
67 #include <sys/pipe.h>
68 #include <sys/sx.h>
69 #include <sys/sysctl.h>
70 #include <sys/msg.h>
71 #include <sys/sem.h>
72 #include <sys/shm.h>
73
74 #include <fs/devfs/devfs.h>
75
76 #include <net/bpfdesc.h>
77 #include <net/if.h>
78 #include <net/if_types.h>
79 #include <net/if_var.h>
80
81 #include <netinet/in.h>
82 #include <netinet/in_pcb.h>
83 #include <netinet/ip_var.h>
84
85 #include <vm/uma.h>
86 #include <vm/vm.h>
87
88 #include <security/mac/mac_policy.h>
89 #include <security/mac_biba/mac_biba.h>
90
91 static SYSCTL_NODE(_security_mac, OID_AUTO, biba,
92 CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
93 "TrustedBSD mac_biba policy controls");
94
95 static int biba_label_size = sizeof(struct mac_biba);
96 SYSCTL_INT(_security_mac_biba, OID_AUTO, label_size, CTLFLAG_RD,
97 &biba_label_size, 0, "Size of struct mac_biba");
98
99 static int biba_enabled = 1;
100 SYSCTL_INT(_security_mac_biba, OID_AUTO, enabled, CTLFLAG_RWTUN, &biba_enabled,
101 0, "Enforce MAC/Biba policy");
102
103 static int destroyed_not_inited;
104 SYSCTL_INT(_security_mac_biba, OID_AUTO, destroyed_not_inited, CTLFLAG_RD,
105 &destroyed_not_inited, 0, "Count of labels destroyed but not inited");
106
107 static int trust_all_interfaces = 0;
108 SYSCTL_INT(_security_mac_biba, OID_AUTO, trust_all_interfaces, CTLFLAG_RDTUN,
109 &trust_all_interfaces, 0, "Consider all interfaces 'trusted' by MAC/Biba");
110
111 static char trusted_interfaces[128];
112 SYSCTL_STRING(_security_mac_biba, OID_AUTO, trusted_interfaces, CTLFLAG_RDTUN,
113 trusted_interfaces, sizeof(trusted_interfaces),
114 "Interfaces considered 'trusted' by MAC/Biba");
115
116 static int max_compartments = MAC_BIBA_MAX_COMPARTMENTS;
117 SYSCTL_INT(_security_mac_biba, OID_AUTO, max_compartments, CTLFLAG_RD,
118 &max_compartments, 0, "Maximum supported compartments");
119
120 static int ptys_equal = 0;
121 SYSCTL_INT(_security_mac_biba, OID_AUTO, ptys_equal, CTLFLAG_RWTUN, &ptys_equal,
122 0, "Label pty devices as biba/equal on create");
123
124 static int interfaces_equal = 1;
125 SYSCTL_INT(_security_mac_biba, OID_AUTO, interfaces_equal, CTLFLAG_RWTUN,
126 &interfaces_equal, 0, "Label network interfaces as biba/equal on create");
127
128 static int revocation_enabled = 0;
129 SYSCTL_INT(_security_mac_biba, OID_AUTO, revocation_enabled, CTLFLAG_RWTUN,
130 &revocation_enabled, 0, "Revoke access to objects on relabel");
131
132 static int biba_slot;
133 #define SLOT(l) ((struct mac_biba *)mac_label_get((l), biba_slot))
134 #define SLOT_SET(l, val) mac_label_set((l), biba_slot, (uintptr_t)(val))
135
136 static uma_zone_t zone_biba;
137
138 static __inline int
biba_bit_set_empty(u_char * set)139 biba_bit_set_empty(u_char *set) {
140 int i;
141
142 for (i = 0; i < MAC_BIBA_MAX_COMPARTMENTS >> 3; i++)
143 if (set[i] != 0)
144 return (0);
145 return (1);
146 }
147
148 static struct mac_biba *
biba_alloc(int flag)149 biba_alloc(int flag)
150 {
151
152 return (uma_zalloc(zone_biba, flag | M_ZERO));
153 }
154
155 static void
biba_free(struct mac_biba * mb)156 biba_free(struct mac_biba *mb)
157 {
158
159 if (mb != NULL)
160 uma_zfree(zone_biba, mb);
161 else
162 atomic_add_int(&destroyed_not_inited, 1);
163 }
164
165 static int
biba_atmostflags(struct mac_biba * mb,int flags)166 biba_atmostflags(struct mac_biba *mb, int flags)
167 {
168
169 if ((mb->mb_flags & flags) != mb->mb_flags)
170 return (EINVAL);
171 return (0);
172 }
173
174 static int
biba_dominate_element(struct mac_biba_element * a,struct mac_biba_element * b)175 biba_dominate_element(struct mac_biba_element *a, struct mac_biba_element *b)
176 {
177 int bit;
178
179 switch (a->mbe_type) {
180 case MAC_BIBA_TYPE_EQUAL:
181 case MAC_BIBA_TYPE_HIGH:
182 return (1);
183
184 case MAC_BIBA_TYPE_LOW:
185 switch (b->mbe_type) {
186 case MAC_BIBA_TYPE_GRADE:
187 case MAC_BIBA_TYPE_HIGH:
188 return (0);
189
190 case MAC_BIBA_TYPE_EQUAL:
191 case MAC_BIBA_TYPE_LOW:
192 return (1);
193
194 default:
195 panic("biba_dominate_element: b->mbe_type invalid");
196 }
197
198 case MAC_BIBA_TYPE_GRADE:
199 switch (b->mbe_type) {
200 case MAC_BIBA_TYPE_EQUAL:
201 case MAC_BIBA_TYPE_LOW:
202 return (1);
203
204 case MAC_BIBA_TYPE_HIGH:
205 return (0);
206
207 case MAC_BIBA_TYPE_GRADE:
208 for (bit = 1; bit <= MAC_BIBA_MAX_COMPARTMENTS; bit++)
209 if (!MAC_BIBA_BIT_TEST(bit,
210 a->mbe_compartments) &&
211 MAC_BIBA_BIT_TEST(bit, b->mbe_compartments))
212 return (0);
213 return (a->mbe_grade >= b->mbe_grade);
214
215 default:
216 panic("biba_dominate_element: b->mbe_type invalid");
217 }
218
219 default:
220 panic("biba_dominate_element: a->mbe_type invalid");
221 }
222
223 return (0);
224 }
225
226 static int
biba_subject_dominate_high(struct mac_biba * mb)227 biba_subject_dominate_high(struct mac_biba *mb)
228 {
229 struct mac_biba_element *element;
230
231 KASSERT((mb->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0,
232 ("biba_effective_in_range: mb not effective"));
233 element = &mb->mb_effective;
234
235 return (element->mbe_type == MAC_BIBA_TYPE_EQUAL ||
236 element->mbe_type == MAC_BIBA_TYPE_HIGH);
237 }
238
239 static int
biba_range_in_range(struct mac_biba * rangea,struct mac_biba * rangeb)240 biba_range_in_range(struct mac_biba *rangea, struct mac_biba *rangeb)
241 {
242
243 return (biba_dominate_element(&rangeb->mb_rangehigh,
244 &rangea->mb_rangehigh) &&
245 biba_dominate_element(&rangea->mb_rangelow,
246 &rangeb->mb_rangelow));
247 }
248
249 static int
biba_effective_in_range(struct mac_biba * effective,struct mac_biba * range)250 biba_effective_in_range(struct mac_biba *effective, struct mac_biba *range)
251 {
252
253 KASSERT((effective->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0,
254 ("biba_effective_in_range: a not effective"));
255 KASSERT((range->mb_flags & MAC_BIBA_FLAG_RANGE) != 0,
256 ("biba_effective_in_range: b not range"));
257
258 return (biba_dominate_element(&range->mb_rangehigh,
259 &effective->mb_effective) &&
260 biba_dominate_element(&effective->mb_effective,
261 &range->mb_rangelow));
262
263 return (1);
264 }
265
266 static int
biba_dominate_effective(struct mac_biba * a,struct mac_biba * b)267 biba_dominate_effective(struct mac_biba *a, struct mac_biba *b)
268 {
269 KASSERT((a->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0,
270 ("biba_dominate_effective: a not effective"));
271 KASSERT((b->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0,
272 ("biba_dominate_effective: b not effective"));
273
274 return (biba_dominate_element(&a->mb_effective, &b->mb_effective));
275 }
276
277 static int
biba_equal_element(struct mac_biba_element * a,struct mac_biba_element * b)278 biba_equal_element(struct mac_biba_element *a, struct mac_biba_element *b)
279 {
280
281 if (a->mbe_type == MAC_BIBA_TYPE_EQUAL ||
282 b->mbe_type == MAC_BIBA_TYPE_EQUAL)
283 return (1);
284
285 return (a->mbe_type == b->mbe_type && a->mbe_grade == b->mbe_grade);
286 }
287
288 static int
biba_equal_effective(struct mac_biba * a,struct mac_biba * b)289 biba_equal_effective(struct mac_biba *a, struct mac_biba *b)
290 {
291
292 KASSERT((a->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0,
293 ("biba_equal_effective: a not effective"));
294 KASSERT((b->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0,
295 ("biba_equal_effective: b not effective"));
296
297 return (biba_equal_element(&a->mb_effective, &b->mb_effective));
298 }
299
300 static int
biba_contains_equal(struct mac_biba * mb)301 biba_contains_equal(struct mac_biba *mb)
302 {
303
304 if (mb->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) {
305 if (mb->mb_effective.mbe_type == MAC_BIBA_TYPE_EQUAL)
306 return (1);
307 }
308
309 if (mb->mb_flags & MAC_BIBA_FLAG_RANGE) {
310 if (mb->mb_rangelow.mbe_type == MAC_BIBA_TYPE_EQUAL)
311 return (1);
312 if (mb->mb_rangehigh.mbe_type == MAC_BIBA_TYPE_EQUAL)
313 return (1);
314 }
315
316 return (0);
317 }
318
319 static int
biba_subject_privileged(struct mac_biba * mb)320 biba_subject_privileged(struct mac_biba *mb)
321 {
322
323 KASSERT((mb->mb_flags & MAC_BIBA_FLAGS_BOTH) == MAC_BIBA_FLAGS_BOTH,
324 ("biba_subject_privileged: subject doesn't have both labels"));
325
326 /* If the effective is EQUAL, it's ok. */
327 if (mb->mb_effective.mbe_type == MAC_BIBA_TYPE_EQUAL)
328 return (0);
329
330 /* If either range endpoint is EQUAL, it's ok. */
331 if (mb->mb_rangelow.mbe_type == MAC_BIBA_TYPE_EQUAL ||
332 mb->mb_rangehigh.mbe_type == MAC_BIBA_TYPE_EQUAL)
333 return (0);
334
335 /* If the range is low-high, it's ok. */
336 if (mb->mb_rangelow.mbe_type == MAC_BIBA_TYPE_LOW &&
337 mb->mb_rangehigh.mbe_type == MAC_BIBA_TYPE_HIGH)
338 return (0);
339
340 /* It's not ok. */
341 return (EPERM);
342 }
343
344 static int
biba_high_effective(struct mac_biba * mb)345 biba_high_effective(struct mac_biba *mb)
346 {
347
348 KASSERT((mb->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0,
349 ("biba_equal_effective: mb not effective"));
350
351 return (mb->mb_effective.mbe_type == MAC_BIBA_TYPE_HIGH);
352 }
353
354 static int
biba_valid(struct mac_biba * mb)355 biba_valid(struct mac_biba *mb)
356 {
357
358 if (mb->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) {
359 switch (mb->mb_effective.mbe_type) {
360 case MAC_BIBA_TYPE_GRADE:
361 break;
362
363 case MAC_BIBA_TYPE_EQUAL:
364 case MAC_BIBA_TYPE_HIGH:
365 case MAC_BIBA_TYPE_LOW:
366 if (mb->mb_effective.mbe_grade != 0 ||
367 !MAC_BIBA_BIT_SET_EMPTY(
368 mb->mb_effective.mbe_compartments))
369 return (EINVAL);
370 break;
371
372 default:
373 return (EINVAL);
374 }
375 } else {
376 if (mb->mb_effective.mbe_type != MAC_BIBA_TYPE_UNDEF)
377 return (EINVAL);
378 }
379
380 if (mb->mb_flags & MAC_BIBA_FLAG_RANGE) {
381 switch (mb->mb_rangelow.mbe_type) {
382 case MAC_BIBA_TYPE_GRADE:
383 break;
384
385 case MAC_BIBA_TYPE_EQUAL:
386 case MAC_BIBA_TYPE_HIGH:
387 case MAC_BIBA_TYPE_LOW:
388 if (mb->mb_rangelow.mbe_grade != 0 ||
389 !MAC_BIBA_BIT_SET_EMPTY(
390 mb->mb_rangelow.mbe_compartments))
391 return (EINVAL);
392 break;
393
394 default:
395 return (EINVAL);
396 }
397
398 switch (mb->mb_rangehigh.mbe_type) {
399 case MAC_BIBA_TYPE_GRADE:
400 break;
401
402 case MAC_BIBA_TYPE_EQUAL:
403 case MAC_BIBA_TYPE_HIGH:
404 case MAC_BIBA_TYPE_LOW:
405 if (mb->mb_rangehigh.mbe_grade != 0 ||
406 !MAC_BIBA_BIT_SET_EMPTY(
407 mb->mb_rangehigh.mbe_compartments))
408 return (EINVAL);
409 break;
410
411 default:
412 return (EINVAL);
413 }
414 if (!biba_dominate_element(&mb->mb_rangehigh,
415 &mb->mb_rangelow))
416 return (EINVAL);
417 } else {
418 if (mb->mb_rangelow.mbe_type != MAC_BIBA_TYPE_UNDEF ||
419 mb->mb_rangehigh.mbe_type != MAC_BIBA_TYPE_UNDEF)
420 return (EINVAL);
421 }
422
423 return (0);
424 }
425
426 static void
biba_set_range(struct mac_biba * mb,u_short typelow,u_short gradelow,u_char * compartmentslow,u_short typehigh,u_short gradehigh,u_char * compartmentshigh)427 biba_set_range(struct mac_biba *mb, u_short typelow, u_short gradelow,
428 u_char *compartmentslow, u_short typehigh, u_short gradehigh,
429 u_char *compartmentshigh)
430 {
431
432 mb->mb_rangelow.mbe_type = typelow;
433 mb->mb_rangelow.mbe_grade = gradelow;
434 if (compartmentslow != NULL)
435 memcpy(mb->mb_rangelow.mbe_compartments, compartmentslow,
436 sizeof(mb->mb_rangelow.mbe_compartments));
437 mb->mb_rangehigh.mbe_type = typehigh;
438 mb->mb_rangehigh.mbe_grade = gradehigh;
439 if (compartmentshigh != NULL)
440 memcpy(mb->mb_rangehigh.mbe_compartments, compartmentshigh,
441 sizeof(mb->mb_rangehigh.mbe_compartments));
442 mb->mb_flags |= MAC_BIBA_FLAG_RANGE;
443 }
444
445 static void
biba_set_effective(struct mac_biba * mb,u_short type,u_short grade,u_char * compartments)446 biba_set_effective(struct mac_biba *mb, u_short type, u_short grade,
447 u_char *compartments)
448 {
449
450 mb->mb_effective.mbe_type = type;
451 mb->mb_effective.mbe_grade = grade;
452 if (compartments != NULL)
453 memcpy(mb->mb_effective.mbe_compartments, compartments,
454 sizeof(mb->mb_effective.mbe_compartments));
455 mb->mb_flags |= MAC_BIBA_FLAG_EFFECTIVE;
456 }
457
458 static void
biba_copy_range(struct mac_biba * labelfrom,struct mac_biba * labelto)459 biba_copy_range(struct mac_biba *labelfrom, struct mac_biba *labelto)
460 {
461
462 KASSERT((labelfrom->mb_flags & MAC_BIBA_FLAG_RANGE) != 0,
463 ("biba_copy_range: labelfrom not range"));
464
465 labelto->mb_rangelow = labelfrom->mb_rangelow;
466 labelto->mb_rangehigh = labelfrom->mb_rangehigh;
467 labelto->mb_flags |= MAC_BIBA_FLAG_RANGE;
468 }
469
470 static void
biba_copy_effective(struct mac_biba * labelfrom,struct mac_biba * labelto)471 biba_copy_effective(struct mac_biba *labelfrom, struct mac_biba *labelto)
472 {
473
474 KASSERT((labelfrom->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0,
475 ("biba_copy_effective: labelfrom not effective"));
476
477 labelto->mb_effective = labelfrom->mb_effective;
478 labelto->mb_flags |= MAC_BIBA_FLAG_EFFECTIVE;
479 }
480
481 static void
biba_copy(struct mac_biba * source,struct mac_biba * dest)482 biba_copy(struct mac_biba *source, struct mac_biba *dest)
483 {
484
485 if (source->mb_flags & MAC_BIBA_FLAG_EFFECTIVE)
486 biba_copy_effective(source, dest);
487 if (source->mb_flags & MAC_BIBA_FLAG_RANGE)
488 biba_copy_range(source, dest);
489 }
490
491 /*
492 * Policy module operations.
493 */
494 static void
biba_init(struct mac_policy_conf * conf)495 biba_init(struct mac_policy_conf *conf)
496 {
497
498 zone_biba = uma_zcreate("mac_biba", sizeof(struct mac_biba), NULL,
499 NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
500 }
501
502 /*
503 * Label operations.
504 */
505 static void
biba_init_label(struct label * label)506 biba_init_label(struct label *label)
507 {
508
509 SLOT_SET(label, biba_alloc(M_WAITOK));
510 }
511
512 static int
biba_init_label_waitcheck(struct label * label,int flag)513 biba_init_label_waitcheck(struct label *label, int flag)
514 {
515
516 SLOT_SET(label, biba_alloc(flag));
517 if (SLOT(label) == NULL)
518 return (ENOMEM);
519
520 return (0);
521 }
522
523 static void
biba_destroy_label(struct label * label)524 biba_destroy_label(struct label *label)
525 {
526
527 biba_free(SLOT(label));
528 SLOT_SET(label, NULL);
529 }
530
531 /*
532 * biba_element_to_string() accepts an sbuf and Biba element. It converts
533 * the Biba element to a string and stores the result in the sbuf; if there
534 * isn't space in the sbuf, -1 is returned.
535 */
536 static int
biba_element_to_string(struct sbuf * sb,struct mac_biba_element * element)537 biba_element_to_string(struct sbuf *sb, struct mac_biba_element *element)
538 {
539 int i, first;
540
541 switch (element->mbe_type) {
542 case MAC_BIBA_TYPE_HIGH:
543 return (sbuf_printf(sb, "high"));
544
545 case MAC_BIBA_TYPE_LOW:
546 return (sbuf_printf(sb, "low"));
547
548 case MAC_BIBA_TYPE_EQUAL:
549 return (sbuf_printf(sb, "equal"));
550
551 case MAC_BIBA_TYPE_GRADE:
552 if (sbuf_printf(sb, "%d", element->mbe_grade) == -1)
553 return (-1);
554
555 first = 1;
556 for (i = 1; i <= MAC_BIBA_MAX_COMPARTMENTS; i++) {
557 if (MAC_BIBA_BIT_TEST(i, element->mbe_compartments)) {
558 if (first) {
559 if (sbuf_putc(sb, ':') == -1)
560 return (-1);
561 if (sbuf_printf(sb, "%d", i) == -1)
562 return (-1);
563 first = 0;
564 } else {
565 if (sbuf_printf(sb, "+%d", i) == -1)
566 return (-1);
567 }
568 }
569 }
570 return (0);
571
572 default:
573 panic("biba_element_to_string: invalid type (%d)",
574 element->mbe_type);
575 }
576 }
577
578 /*
579 * biba_to_string() converts a Biba label to a string, and places the results
580 * in the passed sbuf. It returns 0 on success, or EINVAL if there isn't
581 * room in the sbuf. Note: the sbuf will be modified even in a failure case,
582 * so the caller may need to revert the sbuf by restoring the offset if
583 * that's undesired.
584 */
585 static int
biba_to_string(struct sbuf * sb,struct mac_biba * mb)586 biba_to_string(struct sbuf *sb, struct mac_biba *mb)
587 {
588
589 if (mb->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) {
590 if (biba_element_to_string(sb, &mb->mb_effective) == -1)
591 return (EINVAL);
592 }
593
594 if (mb->mb_flags & MAC_BIBA_FLAG_RANGE) {
595 if (sbuf_putc(sb, '(') == -1)
596 return (EINVAL);
597
598 if (biba_element_to_string(sb, &mb->mb_rangelow) == -1)
599 return (EINVAL);
600
601 if (sbuf_putc(sb, '-') == -1)
602 return (EINVAL);
603
604 if (biba_element_to_string(sb, &mb->mb_rangehigh) == -1)
605 return (EINVAL);
606
607 if (sbuf_putc(sb, ')') == -1)
608 return (EINVAL);
609 }
610
611 return (0);
612 }
613
614 static int
biba_externalize_label(struct label * label,char * element_name,struct sbuf * sb,int * claimed)615 biba_externalize_label(struct label *label, char *element_name,
616 struct sbuf *sb, int *claimed)
617 {
618 struct mac_biba *mb;
619
620 if (strcmp(MAC_BIBA_LABEL_NAME, element_name) != 0)
621 return (0);
622
623 (*claimed)++;
624
625 mb = SLOT(label);
626 return (biba_to_string(sb, mb));
627 }
628
629 static int
biba_parse_element(struct mac_biba_element * element,char * string)630 biba_parse_element(struct mac_biba_element *element, char *string)
631 {
632 char *compartment, *end, *grade;
633 int value;
634
635 if (strcmp(string, "high") == 0 || strcmp(string, "hi") == 0) {
636 element->mbe_type = MAC_BIBA_TYPE_HIGH;
637 element->mbe_grade = MAC_BIBA_TYPE_UNDEF;
638 } else if (strcmp(string, "low") == 0 || strcmp(string, "lo") == 0) {
639 element->mbe_type = MAC_BIBA_TYPE_LOW;
640 element->mbe_grade = MAC_BIBA_TYPE_UNDEF;
641 } else if (strcmp(string, "equal") == 0 ||
642 strcmp(string, "eq") == 0) {
643 element->mbe_type = MAC_BIBA_TYPE_EQUAL;
644 element->mbe_grade = MAC_BIBA_TYPE_UNDEF;
645 } else {
646 element->mbe_type = MAC_BIBA_TYPE_GRADE;
647
648 /*
649 * Numeric grade piece of the element.
650 */
651 grade = strsep(&string, ":");
652 value = strtol(grade, &end, 10);
653 if (end == grade || *end != '\0')
654 return (EINVAL);
655 if (value < 0 || value > 65535)
656 return (EINVAL);
657 element->mbe_grade = value;
658
659 /*
660 * Optional compartment piece of the element. If none are
661 * included, we assume that the label has no compartments.
662 */
663 if (string == NULL)
664 return (0);
665 if (*string == '\0')
666 return (0);
667
668 while ((compartment = strsep(&string, "+")) != NULL) {
669 value = strtol(compartment, &end, 10);
670 if (compartment == end || *end != '\0')
671 return (EINVAL);
672 if (value < 1 || value > MAC_BIBA_MAX_COMPARTMENTS)
673 return (EINVAL);
674 MAC_BIBA_BIT_SET(value, element->mbe_compartments);
675 }
676 }
677
678 return (0);
679 }
680
681 /*
682 * Note: destructively consumes the string, make a local copy before calling
683 * if that's a problem.
684 */
685 static int
biba_parse(struct mac_biba * mb,char * string)686 biba_parse(struct mac_biba *mb, char *string)
687 {
688 char *rangehigh, *rangelow, *effective;
689 int error;
690
691 effective = strsep(&string, "(");
692 if (*effective == '\0')
693 effective = NULL;
694
695 if (string != NULL) {
696 rangelow = strsep(&string, "-");
697 if (string == NULL)
698 return (EINVAL);
699 rangehigh = strsep(&string, ")");
700 if (string == NULL)
701 return (EINVAL);
702 if (*string != '\0')
703 return (EINVAL);
704 } else {
705 rangelow = NULL;
706 rangehigh = NULL;
707 }
708
709 KASSERT((rangelow != NULL && rangehigh != NULL) ||
710 (rangelow == NULL && rangehigh == NULL),
711 ("biba_parse: range mismatch"));
712
713 bzero(mb, sizeof(*mb));
714 if (effective != NULL) {
715 error = biba_parse_element(&mb->mb_effective, effective);
716 if (error)
717 return (error);
718 mb->mb_flags |= MAC_BIBA_FLAG_EFFECTIVE;
719 }
720
721 if (rangelow != NULL) {
722 error = biba_parse_element(&mb->mb_rangelow, rangelow);
723 if (error)
724 return (error);
725 error = biba_parse_element(&mb->mb_rangehigh, rangehigh);
726 if (error)
727 return (error);
728 mb->mb_flags |= MAC_BIBA_FLAG_RANGE;
729 }
730
731 error = biba_valid(mb);
732 if (error)
733 return (error);
734
735 return (0);
736 }
737
738 static int
biba_internalize_label(struct label * label,char * element_name,char * element_data,int * claimed)739 biba_internalize_label(struct label *label, char *element_name,
740 char *element_data, int *claimed)
741 {
742 struct mac_biba *mb, mb_temp;
743 int error;
744
745 if (strcmp(MAC_BIBA_LABEL_NAME, element_name) != 0)
746 return (0);
747
748 (*claimed)++;
749
750 error = biba_parse(&mb_temp, element_data);
751 if (error)
752 return (error);
753
754 mb = SLOT(label);
755 *mb = mb_temp;
756
757 return (0);
758 }
759
760 static void
biba_copy_label(struct label * src,struct label * dest)761 biba_copy_label(struct label *src, struct label *dest)
762 {
763
764 *SLOT(dest) = *SLOT(src);
765 }
766
767 /*
768 * Object-specific entry point implementations are sorted alphabetically by
769 * object type name and then by operation.
770 */
771 static int
biba_bpfdesc_check_receive(struct bpf_d * d,struct label * dlabel,struct ifnet * ifp,struct label * ifplabel)772 biba_bpfdesc_check_receive(struct bpf_d *d, struct label *dlabel,
773 struct ifnet *ifp, struct label *ifplabel)
774 {
775 struct mac_biba *a, *b;
776
777 if (!biba_enabled)
778 return (0);
779
780 a = SLOT(dlabel);
781 b = SLOT(ifplabel);
782
783 if (biba_equal_effective(a, b))
784 return (0);
785 return (EACCES);
786 }
787
788 static void
biba_bpfdesc_create(struct ucred * cred,struct bpf_d * d,struct label * dlabel)789 biba_bpfdesc_create(struct ucred *cred, struct bpf_d *d,
790 struct label *dlabel)
791 {
792 struct mac_biba *source, *dest;
793
794 source = SLOT(cred->cr_label);
795 dest = SLOT(dlabel);
796
797 biba_copy_effective(source, dest);
798 }
799
800 static void
biba_bpfdesc_create_mbuf(struct bpf_d * d,struct label * dlabel,struct mbuf * m,struct label * mlabel)801 biba_bpfdesc_create_mbuf(struct bpf_d *d, struct label *dlabel,
802 struct mbuf *m, struct label *mlabel)
803 {
804 struct mac_biba *source, *dest;
805
806 source = SLOT(dlabel);
807 dest = SLOT(mlabel);
808
809 biba_copy_effective(source, dest);
810 }
811
812 static void
biba_cred_associate_nfsd(struct ucred * cred)813 biba_cred_associate_nfsd(struct ucred *cred)
814 {
815 struct mac_biba *label;
816
817 label = SLOT(cred->cr_label);
818 biba_set_effective(label, MAC_BIBA_TYPE_LOW, 0, NULL);
819 biba_set_range(label, MAC_BIBA_TYPE_LOW, 0, NULL, MAC_BIBA_TYPE_HIGH,
820 0, NULL);
821 }
822
823 static int
biba_cred_check_relabel(struct ucred * cred,struct label * newlabel)824 biba_cred_check_relabel(struct ucred *cred, struct label *newlabel)
825 {
826 struct mac_biba *subj, *new;
827 int error;
828
829 subj = SLOT(cred->cr_label);
830 new = SLOT(newlabel);
831
832 /*
833 * If there is a Biba label update for the credential, it may
834 * be an update of the effective, range, or both.
835 */
836 error = biba_atmostflags(new, MAC_BIBA_FLAGS_BOTH);
837 if (error)
838 return (error);
839
840 /*
841 * If the Biba label is to be changed, authorize as appropriate.
842 */
843 if (new->mb_flags & MAC_BIBA_FLAGS_BOTH) {
844 /*
845 * If the change request modifies both the Biba label
846 * effective and range, check that the new effective will be
847 * in the new range.
848 */
849 if ((new->mb_flags & MAC_BIBA_FLAGS_BOTH) ==
850 MAC_BIBA_FLAGS_BOTH &&
851 !biba_effective_in_range(new, new))
852 return (EINVAL);
853
854 /*
855 * To change the Biba effective label on a credential, the
856 * new effective label must be in the current range.
857 */
858 if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE &&
859 !biba_effective_in_range(new, subj))
860 return (EPERM);
861
862 /*
863 * To change the Biba range on a credential, the new range
864 * label must be in the current range.
865 */
866 if (new->mb_flags & MAC_BIBA_FLAG_RANGE &&
867 !biba_range_in_range(new, subj))
868 return (EPERM);
869
870 /*
871 * To have EQUAL in any component of the new credential Biba
872 * label, the subject must already have EQUAL in their label.
873 */
874 if (biba_contains_equal(new)) {
875 error = biba_subject_privileged(subj);
876 if (error)
877 return (error);
878 }
879 }
880
881 return (0);
882 }
883
884 static int
biba_cred_check_visible(struct ucred * u1,struct ucred * u2)885 biba_cred_check_visible(struct ucred *u1, struct ucred *u2)
886 {
887 struct mac_biba *subj, *obj;
888
889 if (!biba_enabled)
890 return (0);
891
892 subj = SLOT(u1->cr_label);
893 obj = SLOT(u2->cr_label);
894
895 /* XXX: range */
896 if (!biba_dominate_effective(obj, subj))
897 return (ESRCH);
898
899 return (0);
900 }
901
902 static void
biba_cred_create_init(struct ucred * cred)903 biba_cred_create_init(struct ucred *cred)
904 {
905 struct mac_biba *dest;
906
907 dest = SLOT(cred->cr_label);
908
909 biba_set_effective(dest, MAC_BIBA_TYPE_HIGH, 0, NULL);
910 biba_set_range(dest, MAC_BIBA_TYPE_LOW, 0, NULL, MAC_BIBA_TYPE_HIGH,
911 0, NULL);
912 }
913
914 static void
biba_cred_create_swapper(struct ucred * cred)915 biba_cred_create_swapper(struct ucred *cred)
916 {
917 struct mac_biba *dest;
918
919 dest = SLOT(cred->cr_label);
920
921 biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL);
922 biba_set_range(dest, MAC_BIBA_TYPE_LOW, 0, NULL, MAC_BIBA_TYPE_HIGH,
923 0, NULL);
924 }
925
926 static void
biba_cred_relabel(struct ucred * cred,struct label * newlabel)927 biba_cred_relabel(struct ucred *cred, struct label *newlabel)
928 {
929 struct mac_biba *source, *dest;
930
931 source = SLOT(newlabel);
932 dest = SLOT(cred->cr_label);
933
934 biba_copy(source, dest);
935 }
936
937 static void
biba_devfs_create_device(struct ucred * cred,struct mount * mp,struct cdev * dev,struct devfs_dirent * de,struct label * delabel)938 biba_devfs_create_device(struct ucred *cred, struct mount *mp,
939 struct cdev *dev, struct devfs_dirent *de, struct label *delabel)
940 {
941 struct mac_biba *mb;
942 const char *dn;
943 int biba_type;
944
945 mb = SLOT(delabel);
946 dn = devtoname(dev);
947 if (strcmp(dn, "null") == 0 ||
948 strcmp(dn, "zero") == 0 ||
949 strcmp(dn, "random") == 0 ||
950 strncmp(dn, "fd/", strlen("fd/")) == 0)
951 biba_type = MAC_BIBA_TYPE_EQUAL;
952 else if (ptys_equal &&
953 (strncmp(dn, "ttyp", strlen("ttyp")) == 0 ||
954 strncmp(dn, "pts/", strlen("pts/")) == 0 ||
955 strncmp(dn, "ptyp", strlen("ptyp")) == 0))
956 biba_type = MAC_BIBA_TYPE_EQUAL;
957 else
958 biba_type = MAC_BIBA_TYPE_HIGH;
959 biba_set_effective(mb, biba_type, 0, NULL);
960 }
961
962 static void
biba_devfs_create_directory(struct mount * mp,char * dirname,int dirnamelen,struct devfs_dirent * de,struct label * delabel)963 biba_devfs_create_directory(struct mount *mp, char *dirname, int dirnamelen,
964 struct devfs_dirent *de, struct label *delabel)
965 {
966 struct mac_biba *mb;
967
968 mb = SLOT(delabel);
969
970 biba_set_effective(mb, MAC_BIBA_TYPE_HIGH, 0, NULL);
971 }
972
973 static void
biba_devfs_create_symlink(struct ucred * cred,struct mount * mp,struct devfs_dirent * dd,struct label * ddlabel,struct devfs_dirent * de,struct label * delabel)974 biba_devfs_create_symlink(struct ucred *cred, struct mount *mp,
975 struct devfs_dirent *dd, struct label *ddlabel, struct devfs_dirent *de,
976 struct label *delabel)
977 {
978 struct mac_biba *source, *dest;
979
980 source = SLOT(cred->cr_label);
981 dest = SLOT(delabel);
982
983 biba_copy_effective(source, dest);
984 }
985
986 static void
biba_devfs_update(struct mount * mp,struct devfs_dirent * de,struct label * delabel,struct vnode * vp,struct label * vplabel)987 biba_devfs_update(struct mount *mp, struct devfs_dirent *de,
988 struct label *delabel, struct vnode *vp, struct label *vplabel)
989 {
990 struct mac_biba *source, *dest;
991
992 source = SLOT(vplabel);
993 dest = SLOT(delabel);
994
995 biba_copy(source, dest);
996 }
997
998 static void
biba_devfs_vnode_associate(struct mount * mp,struct label * mntlabel,struct devfs_dirent * de,struct label * delabel,struct vnode * vp,struct label * vplabel)999 biba_devfs_vnode_associate(struct mount *mp, struct label *mntlabel,
1000 struct devfs_dirent *de, struct label *delabel, struct vnode *vp,
1001 struct label *vplabel)
1002 {
1003 struct mac_biba *source, *dest;
1004
1005 source = SLOT(delabel);
1006 dest = SLOT(vplabel);
1007
1008 biba_copy_effective(source, dest);
1009 }
1010
1011 static int
biba_ifnet_check_relabel(struct ucred * cred,struct ifnet * ifp,struct label * ifplabel,struct label * newlabel)1012 biba_ifnet_check_relabel(struct ucred *cred, struct ifnet *ifp,
1013 struct label *ifplabel, struct label *newlabel)
1014 {
1015 struct mac_biba *subj, *new;
1016 int error;
1017
1018 subj = SLOT(cred->cr_label);
1019 new = SLOT(newlabel);
1020
1021 /*
1022 * If there is a Biba label update for the interface, it may be an
1023 * update of the effective, range, or both.
1024 */
1025 error = biba_atmostflags(new, MAC_BIBA_FLAGS_BOTH);
1026 if (error)
1027 return (error);
1028
1029 /*
1030 * Relabling network interfaces requires Biba privilege.
1031 */
1032 error = biba_subject_privileged(subj);
1033 if (error)
1034 return (error);
1035
1036 return (0);
1037 }
1038
1039 static int
biba_ifnet_check_transmit(struct ifnet * ifp,struct label * ifplabel,struct mbuf * m,struct label * mlabel)1040 biba_ifnet_check_transmit(struct ifnet *ifp, struct label *ifplabel,
1041 struct mbuf *m, struct label *mlabel)
1042 {
1043 struct mac_biba *p, *i;
1044
1045 if (!biba_enabled)
1046 return (0);
1047
1048 p = SLOT(mlabel);
1049 i = SLOT(ifplabel);
1050
1051 return (biba_effective_in_range(p, i) ? 0 : EACCES);
1052 }
1053
1054 static void
biba_ifnet_create(struct ifnet * ifp,struct label * ifplabel)1055 biba_ifnet_create(struct ifnet *ifp, struct label *ifplabel)
1056 {
1057 char tifname[IFNAMSIZ], *p, *q;
1058 char tiflist[sizeof(trusted_interfaces)];
1059 struct mac_biba *dest;
1060 int len, type;
1061
1062 dest = SLOT(ifplabel);
1063
1064 if (if_gettype(ifp) == IFT_LOOP || interfaces_equal != 0) {
1065 type = MAC_BIBA_TYPE_EQUAL;
1066 goto set;
1067 }
1068
1069 if (trust_all_interfaces) {
1070 type = MAC_BIBA_TYPE_HIGH;
1071 goto set;
1072 }
1073
1074 type = MAC_BIBA_TYPE_LOW;
1075
1076 if (trusted_interfaces[0] == '\0' ||
1077 !strvalid(trusted_interfaces, sizeof(trusted_interfaces)))
1078 goto set;
1079
1080 bzero(tiflist, sizeof(tiflist));
1081 for (p = trusted_interfaces, q = tiflist; *p != '\0'; p++, q++)
1082 if(*p != ' ' && *p != '\t')
1083 *q = *p;
1084
1085 for (p = q = tiflist;; p++) {
1086 if (*p == ',' || *p == '\0') {
1087 len = p - q;
1088 if (len < IFNAMSIZ) {
1089 bzero(tifname, sizeof(tifname));
1090 bcopy(q, tifname, len);
1091 if (strcmp(tifname, if_name(ifp)) == 0) {
1092 type = MAC_BIBA_TYPE_HIGH;
1093 break;
1094 }
1095 } else {
1096 *p = '\0';
1097 printf("mac_biba warning: interface name "
1098 "\"%s\" is too long (must be < %d)\n",
1099 q, IFNAMSIZ);
1100 }
1101 if (*p == '\0')
1102 break;
1103 q = p + 1;
1104 }
1105 }
1106 set:
1107 biba_set_effective(dest, type, 0, NULL);
1108 biba_set_range(dest, type, 0, NULL, type, 0, NULL);
1109 }
1110
1111 static void
biba_ifnet_create_mbuf(struct ifnet * ifp,struct label * ifplabel,struct mbuf * m,struct label * mlabel)1112 biba_ifnet_create_mbuf(struct ifnet *ifp, struct label *ifplabel,
1113 struct mbuf *m, struct label *mlabel)
1114 {
1115 struct mac_biba *source, *dest;
1116
1117 source = SLOT(ifplabel);
1118 dest = SLOT(mlabel);
1119
1120 biba_copy_effective(source, dest);
1121 }
1122
1123 static void
biba_ifnet_relabel(struct ucred * cred,struct ifnet * ifp,struct label * ifplabel,struct label * newlabel)1124 biba_ifnet_relabel(struct ucred *cred, struct ifnet *ifp,
1125 struct label *ifplabel, struct label *newlabel)
1126 {
1127 struct mac_biba *source, *dest;
1128
1129 source = SLOT(newlabel);
1130 dest = SLOT(ifplabel);
1131
1132 biba_copy(source, dest);
1133 }
1134
1135 static int
biba_inpcb_check_deliver(struct inpcb * inp,struct label * inplabel,struct mbuf * m,struct label * mlabel)1136 biba_inpcb_check_deliver(struct inpcb *inp, struct label *inplabel,
1137 struct mbuf *m, struct label *mlabel)
1138 {
1139 struct mac_biba *p, *i;
1140
1141 if (!biba_enabled)
1142 return (0);
1143
1144 p = SLOT(mlabel);
1145 i = SLOT(inplabel);
1146
1147 return (biba_equal_effective(p, i) ? 0 : EACCES);
1148 }
1149
1150 static int
biba_inpcb_check_visible(struct ucred * cred,struct inpcb * inp,struct label * inplabel)1151 biba_inpcb_check_visible(struct ucred *cred, struct inpcb *inp,
1152 struct label *inplabel)
1153 {
1154 struct mac_biba *subj, *obj;
1155
1156 if (!biba_enabled)
1157 return (0);
1158
1159 subj = SLOT(cred->cr_label);
1160 obj = SLOT(inplabel);
1161
1162 if (!biba_dominate_effective(obj, subj))
1163 return (ENOENT);
1164
1165 return (0);
1166 }
1167
1168 static void
biba_inpcb_create(struct socket * so,struct label * solabel,struct inpcb * inp,struct label * inplabel)1169 biba_inpcb_create(struct socket *so, struct label *solabel,
1170 struct inpcb *inp, struct label *inplabel)
1171 {
1172 struct mac_biba *source, *dest;
1173
1174 source = SLOT(solabel);
1175 dest = SLOT(inplabel);
1176
1177 SOCK_LOCK(so);
1178 biba_copy_effective(source, dest);
1179 SOCK_UNLOCK(so);
1180 }
1181
1182 static void
biba_inpcb_create_mbuf(struct inpcb * inp,struct label * inplabel,struct mbuf * m,struct label * mlabel)1183 biba_inpcb_create_mbuf(struct inpcb *inp, struct label *inplabel,
1184 struct mbuf *m, struct label *mlabel)
1185 {
1186 struct mac_biba *source, *dest;
1187
1188 source = SLOT(inplabel);
1189 dest = SLOT(mlabel);
1190
1191 biba_copy_effective(source, dest);
1192 }
1193
1194 static void
biba_inpcb_sosetlabel(struct socket * so,struct label * solabel,struct inpcb * inp,struct label * inplabel)1195 biba_inpcb_sosetlabel(struct socket *so, struct label *solabel,
1196 struct inpcb *inp, struct label *inplabel)
1197 {
1198 struct mac_biba *source, *dest;
1199
1200 SOCK_LOCK_ASSERT(so);
1201
1202 source = SLOT(solabel);
1203 dest = SLOT(inplabel);
1204
1205 biba_copy(source, dest);
1206 }
1207
1208 static void
biba_ip6q_create(struct mbuf * m,struct label * mlabel,struct ip6q * q6,struct label * q6label)1209 biba_ip6q_create(struct mbuf *m, struct label *mlabel, struct ip6q *q6,
1210 struct label *q6label)
1211 {
1212 struct mac_biba *source, *dest;
1213
1214 source = SLOT(mlabel);
1215 dest = SLOT(q6label);
1216
1217 biba_copy_effective(source, dest);
1218 }
1219
1220 static int
biba_ip6q_match(struct mbuf * m,struct label * mlabel,struct ip6q * q6,struct label * q6label)1221 biba_ip6q_match(struct mbuf *m, struct label *mlabel, struct ip6q *q6,
1222 struct label *q6label)
1223 {
1224 struct mac_biba *a, *b;
1225
1226 a = SLOT(q6label);
1227 b = SLOT(mlabel);
1228
1229 return (biba_equal_effective(a, b));
1230 }
1231
1232 static void
biba_ip6q_reassemble(struct ip6q * q6,struct label * q6label,struct mbuf * m,struct label * mlabel)1233 biba_ip6q_reassemble(struct ip6q *q6, struct label *q6label, struct mbuf *m,
1234 struct label *mlabel)
1235 {
1236 struct mac_biba *source, *dest;
1237
1238 source = SLOT(q6label);
1239 dest = SLOT(mlabel);
1240
1241 /* Just use the head, since we require them all to match. */
1242 biba_copy_effective(source, dest);
1243 }
1244
1245 static void
biba_ip6q_update(struct mbuf * m,struct label * mlabel,struct ip6q * q6,struct label * q6label)1246 biba_ip6q_update(struct mbuf *m, struct label *mlabel, struct ip6q *q6,
1247 struct label *q6label)
1248 {
1249
1250 /* NOOP: we only accept matching labels, so no need to update */
1251 }
1252
1253 static void
biba_ipq_create(struct mbuf * m,struct label * mlabel,struct ipq * q,struct label * qlabel)1254 biba_ipq_create(struct mbuf *m, struct label *mlabel, struct ipq *q,
1255 struct label *qlabel)
1256 {
1257 struct mac_biba *source, *dest;
1258
1259 source = SLOT(mlabel);
1260 dest = SLOT(qlabel);
1261
1262 biba_copy_effective(source, dest);
1263 }
1264
1265 static int
biba_ipq_match(struct mbuf * m,struct label * mlabel,struct ipq * q,struct label * qlabel)1266 biba_ipq_match(struct mbuf *m, struct label *mlabel, struct ipq *q,
1267 struct label *qlabel)
1268 {
1269 struct mac_biba *a, *b;
1270
1271 a = SLOT(qlabel);
1272 b = SLOT(mlabel);
1273
1274 return (biba_equal_effective(a, b));
1275 }
1276
1277 static void
biba_ipq_reassemble(struct ipq * q,struct label * qlabel,struct mbuf * m,struct label * mlabel)1278 biba_ipq_reassemble(struct ipq *q, struct label *qlabel, struct mbuf *m,
1279 struct label *mlabel)
1280 {
1281 struct mac_biba *source, *dest;
1282
1283 source = SLOT(qlabel);
1284 dest = SLOT(mlabel);
1285
1286 /* Just use the head, since we require them all to match. */
1287 biba_copy_effective(source, dest);
1288 }
1289
1290 static void
biba_ipq_update(struct mbuf * m,struct label * mlabel,struct ipq * q,struct label * qlabel)1291 biba_ipq_update(struct mbuf *m, struct label *mlabel, struct ipq *q,
1292 struct label *qlabel)
1293 {
1294
1295 /* NOOP: we only accept matching labels, so no need to update */
1296 }
1297
1298 static int
biba_kld_check_load(struct ucred * cred,struct vnode * vp,struct label * vplabel)1299 biba_kld_check_load(struct ucred *cred, struct vnode *vp,
1300 struct label *vplabel)
1301 {
1302 struct mac_biba *subj, *obj;
1303 int error;
1304
1305 if (!biba_enabled)
1306 return (0);
1307
1308 subj = SLOT(cred->cr_label);
1309
1310 error = biba_subject_privileged(subj);
1311 if (error)
1312 return (error);
1313
1314 obj = SLOT(vplabel);
1315 if (!biba_high_effective(obj))
1316 return (EACCES);
1317
1318 return (0);
1319 }
1320
1321 static int
biba_mount_check_stat(struct ucred * cred,struct mount * mp,struct label * mplabel)1322 biba_mount_check_stat(struct ucred *cred, struct mount *mp,
1323 struct label *mplabel)
1324 {
1325 struct mac_biba *subj, *obj;
1326
1327 if (!biba_enabled)
1328 return (0);
1329
1330 subj = SLOT(cred->cr_label);
1331 obj = SLOT(mplabel);
1332
1333 if (!biba_dominate_effective(obj, subj))
1334 return (EACCES);
1335
1336 return (0);
1337 }
1338
1339 static void
biba_mount_create(struct ucred * cred,struct mount * mp,struct label * mplabel)1340 biba_mount_create(struct ucred *cred, struct mount *mp,
1341 struct label *mplabel)
1342 {
1343 struct mac_biba *source, *dest;
1344
1345 source = SLOT(cred->cr_label);
1346 dest = SLOT(mplabel);
1347
1348 biba_copy_effective(source, dest);
1349 }
1350
1351 static void
biba_netinet_arp_send(struct ifnet * ifp,struct label * ifplabel,struct mbuf * m,struct label * mlabel)1352 biba_netinet_arp_send(struct ifnet *ifp, struct label *ifplabel,
1353 struct mbuf *m, struct label *mlabel)
1354 {
1355 struct mac_biba *dest;
1356
1357 dest = SLOT(mlabel);
1358
1359 biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL);
1360 }
1361
1362 static void
biba_netinet_firewall_reply(struct mbuf * mrecv,struct label * mrecvlabel,struct mbuf * msend,struct label * msendlabel)1363 biba_netinet_firewall_reply(struct mbuf *mrecv, struct label *mrecvlabel,
1364 struct mbuf *msend, struct label *msendlabel)
1365 {
1366 struct mac_biba *source, *dest;
1367
1368 source = SLOT(mrecvlabel);
1369 dest = SLOT(msendlabel);
1370
1371 biba_copy_effective(source, dest);
1372 }
1373
1374 static void
biba_netinet_firewall_send(struct mbuf * m,struct label * mlabel)1375 biba_netinet_firewall_send(struct mbuf *m, struct label *mlabel)
1376 {
1377 struct mac_biba *dest;
1378
1379 dest = SLOT(mlabel);
1380
1381 /* XXX: where is the label for the firewall really coming from? */
1382 biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL);
1383 }
1384
1385 static void
biba_netinet_fragment(struct mbuf * m,struct label * mlabel,struct mbuf * frag,struct label * fraglabel)1386 biba_netinet_fragment(struct mbuf *m, struct label *mlabel,
1387 struct mbuf *frag, struct label *fraglabel)
1388 {
1389 struct mac_biba *source, *dest;
1390
1391 source = SLOT(mlabel);
1392 dest = SLOT(fraglabel);
1393
1394 biba_copy_effective(source, dest);
1395 }
1396
1397 static void
biba_netinet_icmp_reply(struct mbuf * mrecv,struct label * mrecvlabel,struct mbuf * msend,struct label * msendlabel)1398 biba_netinet_icmp_reply(struct mbuf *mrecv, struct label *mrecvlabel,
1399 struct mbuf *msend, struct label *msendlabel)
1400 {
1401 struct mac_biba *source, *dest;
1402
1403 source = SLOT(mrecvlabel);
1404 dest = SLOT(msendlabel);
1405
1406 biba_copy_effective(source, dest);
1407 }
1408
1409 static void
biba_netinet_igmp_send(struct ifnet * ifp,struct label * ifplabel,struct mbuf * m,struct label * mlabel)1410 biba_netinet_igmp_send(struct ifnet *ifp, struct label *ifplabel,
1411 struct mbuf *m, struct label *mlabel)
1412 {
1413 struct mac_biba *dest;
1414
1415 dest = SLOT(mlabel);
1416
1417 biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL);
1418 }
1419
1420 static void
biba_netinet6_nd6_send(struct ifnet * ifp,struct label * ifplabel,struct mbuf * m,struct label * mlabel)1421 biba_netinet6_nd6_send(struct ifnet *ifp, struct label *ifplabel,
1422 struct mbuf *m, struct label *mlabel)
1423 {
1424 struct mac_biba *dest;
1425
1426 dest = SLOT(mlabel);
1427
1428 biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL);
1429 }
1430
1431 static int
biba_pipe_check_ioctl(struct ucred * cred,struct pipepair * pp,struct label * pplabel,unsigned long cmd,void * data)1432 biba_pipe_check_ioctl(struct ucred *cred, struct pipepair *pp,
1433 struct label *pplabel, unsigned long cmd, void /* caddr_t */ *data)
1434 {
1435
1436 if(!biba_enabled)
1437 return (0);
1438
1439 /* XXX: This will be implemented soon... */
1440
1441 return (0);
1442 }
1443
1444 static int
biba_pipe_check_poll(struct ucred * cred,struct pipepair * pp,struct label * pplabel)1445 biba_pipe_check_poll(struct ucred *cred, struct pipepair *pp,
1446 struct label *pplabel)
1447 {
1448 struct mac_biba *subj, *obj;
1449
1450 if (!biba_enabled)
1451 return (0);
1452
1453 subj = SLOT(cred->cr_label);
1454 obj = SLOT(pplabel);
1455
1456 if (!biba_dominate_effective(obj, subj))
1457 return (EACCES);
1458
1459 return (0);
1460 }
1461
1462 static int
biba_pipe_check_read(struct ucred * cred,struct pipepair * pp,struct label * pplabel)1463 biba_pipe_check_read(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
1480 static int
biba_pipe_check_relabel(struct ucred * cred,struct pipepair * pp,struct label * pplabel,struct label * newlabel)1481 biba_pipe_check_relabel(struct ucred *cred, struct pipepair *pp,
1482 struct label *pplabel, struct label *newlabel)
1483 {
1484 struct mac_biba *subj, *obj, *new;
1485 int error;
1486
1487 new = SLOT(newlabel);
1488 subj = SLOT(cred->cr_label);
1489 obj = SLOT(pplabel);
1490
1491 /*
1492 * If there is a Biba label update for a pipe, it must be a effective
1493 * update.
1494 */
1495 error = biba_atmostflags(new, MAC_BIBA_FLAG_EFFECTIVE);
1496 if (error)
1497 return (error);
1498
1499 /*
1500 * To perform a relabel of a pipe (Biba label or not), Biba must
1501 * authorize the relabel.
1502 */
1503 if (!biba_effective_in_range(obj, subj))
1504 return (EPERM);
1505
1506 /*
1507 * If the Biba label is to be changed, authorize as appropriate.
1508 */
1509 if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) {
1510 /*
1511 * To change the Biba label on a pipe, the new pipe label
1512 * must be in the subject range.
1513 */
1514 if (!biba_effective_in_range(new, subj))
1515 return (EPERM);
1516
1517 /*
1518 * To change the Biba label on a pipe to be EQUAL, the
1519 * subject must have appropriate privilege.
1520 */
1521 if (biba_contains_equal(new)) {
1522 error = biba_subject_privileged(subj);
1523 if (error)
1524 return (error);
1525 }
1526 }
1527
1528 return (0);
1529 }
1530
1531 static int
biba_pipe_check_stat(struct ucred * cred,struct pipepair * pp,struct label * pplabel)1532 biba_pipe_check_stat(struct ucred *cred, struct pipepair *pp,
1533 struct label *pplabel)
1534 {
1535 struct mac_biba *subj, *obj;
1536
1537 if (!biba_enabled)
1538 return (0);
1539
1540 subj = SLOT(cred->cr_label);
1541 obj = SLOT(pplabel);
1542
1543 if (!biba_dominate_effective(obj, subj))
1544 return (EACCES);
1545
1546 return (0);
1547 }
1548
1549 static int
biba_pipe_check_write(struct ucred * cred,struct pipepair * pp,struct label * pplabel)1550 biba_pipe_check_write(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(subj, obj))
1562 return (EACCES);
1563
1564 return (0);
1565 }
1566
1567 static void
biba_pipe_create(struct ucred * cred,struct pipepair * pp,struct label * pplabel)1568 biba_pipe_create(struct ucred *cred, struct pipepair *pp,
1569 struct label *pplabel)
1570 {
1571 struct mac_biba *source, *dest;
1572
1573 source = SLOT(cred->cr_label);
1574 dest = SLOT(pplabel);
1575
1576 biba_copy_effective(source, dest);
1577 }
1578
1579 static void
biba_pipe_relabel(struct ucred * cred,struct pipepair * pp,struct label * pplabel,struct label * newlabel)1580 biba_pipe_relabel(struct ucred *cred, struct pipepair *pp,
1581 struct label *pplabel, struct label *newlabel)
1582 {
1583 struct mac_biba *source, *dest;
1584
1585 source = SLOT(newlabel);
1586 dest = SLOT(pplabel);
1587
1588 biba_copy(source, dest);
1589 }
1590
1591 static int
biba_posixsem_check_openunlink(struct ucred * cred,struct ksem * ks,struct label * kslabel)1592 biba_posixsem_check_openunlink(struct ucred *cred, struct ksem *ks,
1593 struct label *kslabel)
1594 {
1595 struct mac_biba *subj, *obj;
1596
1597 if (!biba_enabled)
1598 return (0);
1599
1600 subj = SLOT(cred->cr_label);
1601 obj = SLOT(kslabel);
1602
1603 if (!biba_dominate_effective(subj, obj))
1604 return (EACCES);
1605
1606 return (0);
1607 }
1608
1609 static int
biba_posixsem_check_setmode(struct ucred * cred,struct ksem * ks,struct label * kslabel,mode_t mode)1610 biba_posixsem_check_setmode(struct ucred *cred, struct ksem *ks,
1611 struct label *kslabel, mode_t mode)
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
1627 static int
biba_posixsem_check_setowner(struct ucred * cred,struct ksem * ks,struct label * kslabel,uid_t uid,gid_t gid)1628 biba_posixsem_check_setowner(struct ucred *cred, struct ksem *ks,
1629 struct label *kslabel, uid_t uid, gid_t gid)
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
1645 static int
biba_posixsem_check_write(struct ucred * active_cred,struct ucred * file_cred,struct ksem * ks,struct label * kslabel)1646 biba_posixsem_check_write(struct ucred *active_cred, struct ucred *file_cred,
1647 struct ksem *ks, struct label *kslabel)
1648 {
1649 struct mac_biba *subj, *obj;
1650
1651 if (!biba_enabled)
1652 return (0);
1653
1654 subj = SLOT(active_cred->cr_label);
1655 obj = SLOT(kslabel);
1656
1657 if (!biba_dominate_effective(subj, obj))
1658 return (EACCES);
1659
1660 return (0);
1661 }
1662
1663 static int
biba_posixsem_check_rdonly(struct ucred * active_cred,struct ucred * file_cred,struct ksem * ks,struct label * kslabel)1664 biba_posixsem_check_rdonly(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(obj, subj))
1676 return (EACCES);
1677
1678 return (0);
1679 }
1680
1681 static void
biba_posixsem_create(struct ucred * cred,struct ksem * ks,struct label * kslabel)1682 biba_posixsem_create(struct ucred *cred, struct ksem *ks,
1683 struct label *kslabel)
1684 {
1685 struct mac_biba *source, *dest;
1686
1687 source = SLOT(cred->cr_label);
1688 dest = SLOT(kslabel);
1689
1690 biba_copy_effective(source, dest);
1691 }
1692
1693 static int
biba_posixshm_check_mmap(struct ucred * cred,struct shmfd * shmfd,struct label * shmlabel,int prot,int flags)1694 biba_posixshm_check_mmap(struct ucred *cred, struct shmfd *shmfd,
1695 struct label *shmlabel, int prot, int flags)
1696 {
1697 struct mac_biba *subj, *obj;
1698
1699 if (!biba_enabled || !revocation_enabled)
1700 return (0);
1701
1702 subj = SLOT(cred->cr_label);
1703 obj = SLOT(shmlabel);
1704
1705 if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) {
1706 if (!biba_dominate_effective(obj, subj))
1707 return (EACCES);
1708 }
1709 if (((prot & VM_PROT_WRITE) != 0) && ((flags & MAP_SHARED) != 0)) {
1710 if (!biba_dominate_effective(subj, obj))
1711 return (EACCES);
1712 }
1713
1714 return (0);
1715 }
1716
1717 static int
biba_posixshm_check_open(struct ucred * cred,struct shmfd * shmfd,struct label * shmlabel,accmode_t accmode)1718 biba_posixshm_check_open(struct ucred *cred, struct shmfd *shmfd,
1719 struct label *shmlabel, accmode_t accmode)
1720 {
1721 struct mac_biba *subj, *obj;
1722
1723 if (!biba_enabled)
1724 return (0);
1725
1726 subj = SLOT(cred->cr_label);
1727 obj = SLOT(shmlabel);
1728
1729 if (accmode & (VREAD | VEXEC | VSTAT_PERMS)) {
1730 if (!biba_dominate_effective(obj, subj))
1731 return (EACCES);
1732 }
1733 if (accmode & VMODIFY_PERMS) {
1734 if (!biba_dominate_effective(subj, obj))
1735 return (EACCES);
1736 }
1737
1738 return (0);
1739 }
1740
1741 static int
biba_posixshm_check_read(struct ucred * active_cred,struct ucred * file_cred,struct shmfd * vp,struct label * shmlabel)1742 biba_posixshm_check_read(struct ucred *active_cred, struct ucred *file_cred,
1743 struct shmfd *vp, struct label *shmlabel)
1744 {
1745 struct mac_biba *subj, *obj;
1746
1747 if (!biba_enabled || !revocation_enabled)
1748 return (0);
1749
1750 subj = SLOT(active_cred->cr_label);
1751 obj = SLOT(shmlabel);
1752
1753 if (!biba_dominate_effective(obj, subj))
1754 return (EACCES);
1755
1756 return (0);
1757 }
1758
1759 static int
biba_posixshm_check_setmode(struct ucred * cred,struct shmfd * shmfd,struct label * shmlabel,mode_t mode)1760 biba_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
1777 static int
biba_posixshm_check_setowner(struct ucred * cred,struct shmfd * shmfd,struct label * shmlabel,uid_t uid,gid_t gid)1778 biba_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
1795 static int
biba_posixshm_check_stat(struct ucred * active_cred,struct ucred * file_cred,struct shmfd * shmfd,struct label * shmlabel)1796 biba_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
1813 static int
biba_posixshm_check_truncate(struct ucred * active_cred,struct ucred * file_cred,struct shmfd * shmfd,struct label * shmlabel)1814 biba_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
1831 static int
biba_posixshm_check_unlink(struct ucred * cred,struct shmfd * shmfd,struct label * shmlabel)1832 biba_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
1849 static int
biba_posixshm_check_write(struct ucred * active_cred,struct ucred * file_cred,struct shmfd * vp,struct label * shmlabel)1850 biba_posixshm_check_write(struct ucred *active_cred, struct ucred *file_cred,
1851 struct shmfd *vp, struct label *shmlabel)
1852 {
1853 struct mac_biba *subj, *obj;
1854
1855 if (!biba_enabled || !revocation_enabled)
1856 return (0);
1857
1858 subj = SLOT(active_cred->cr_label);
1859 obj = SLOT(shmlabel);
1860
1861 if (!biba_dominate_effective(obj, subj))
1862 return (EACCES);
1863
1864 return (0);
1865 }
1866
1867 static void
biba_posixshm_create(struct ucred * cred,struct shmfd * shmfd,struct label * shmlabel)1868 biba_posixshm_create(struct ucred *cred, struct shmfd *shmfd,
1869 struct label *shmlabel)
1870 {
1871 struct mac_biba *source, *dest;
1872
1873 source = SLOT(cred->cr_label);
1874 dest = SLOT(shmlabel);
1875
1876 biba_copy_effective(source, dest);
1877 }
1878
1879 /*
1880 * Some system privileges are allowed regardless of integrity grade; others
1881 * are allowed only when running with privilege with respect to the Biba
1882 * policy as they might otherwise allow bypassing of the integrity policy.
1883 */
1884 static int
biba_priv_check(struct ucred * cred,int priv)1885 biba_priv_check(struct ucred *cred, int priv)
1886 {
1887 struct mac_biba *subj;
1888 int error;
1889
1890 if (!biba_enabled)
1891 return (0);
1892
1893 /*
1894 * Exempt only specific privileges from the Biba integrity policy.
1895 */
1896 switch (priv) {
1897 case PRIV_KTRACE:
1898 case PRIV_MSGBUF:
1899
1900 /*
1901 * Allow processes to manipulate basic process audit properties, and
1902 * to submit audit records.
1903 */
1904 case PRIV_AUDIT_GETAUDIT:
1905 case PRIV_AUDIT_SETAUDIT:
1906 case PRIV_AUDIT_SUBMIT:
1907
1908 /*
1909 * Allow processes to manipulate their regular UNIX credentials.
1910 */
1911 case PRIV_CRED_SETUID:
1912 case PRIV_CRED_SETEUID:
1913 case PRIV_CRED_SETGID:
1914 case PRIV_CRED_SETEGID:
1915 case PRIV_CRED_SETGROUPS:
1916 case PRIV_CRED_SETREUID:
1917 case PRIV_CRED_SETREGID:
1918 case PRIV_CRED_SETRESUID:
1919 case PRIV_CRED_SETRESGID:
1920
1921 /*
1922 * Allow processes to perform system monitoring.
1923 */
1924 case PRIV_SEEOTHERGIDS:
1925 case PRIV_SEEOTHERUIDS:
1926 case PRIV_SEEJAILPROC:
1927 break;
1928
1929 /*
1930 * Allow access to general process debugging facilities. We
1931 * separately control debugging based on MAC label.
1932 */
1933 case PRIV_DEBUG_DIFFCRED:
1934 case PRIV_DEBUG_SUGID:
1935 case PRIV_DEBUG_UNPRIV:
1936
1937 /*
1938 * Allow manipulating jails.
1939 */
1940 case PRIV_JAIL_ATTACH:
1941
1942 /*
1943 * Allow privilege with respect to the Partition policy, but not the
1944 * Privs policy.
1945 */
1946 case PRIV_MAC_PARTITION:
1947
1948 /*
1949 * Allow privilege with respect to process resource limits and login
1950 * context.
1951 */
1952 case PRIV_PROC_LIMIT:
1953 case PRIV_PROC_SETLOGIN:
1954 case PRIV_PROC_SETRLIMIT:
1955
1956 /*
1957 * Allow System V and POSIX IPC privileges.
1958 */
1959 case PRIV_IPC_READ:
1960 case PRIV_IPC_WRITE:
1961 case PRIV_IPC_ADMIN:
1962 case PRIV_IPC_MSGSIZE:
1963 case PRIV_MQ_ADMIN:
1964
1965 /*
1966 * Allow certain scheduler manipulations -- possibly this should be
1967 * controlled by more fine-grained policy, as potentially low
1968 * integrity processes can deny CPU to higher integrity ones.
1969 */
1970 case PRIV_SCHED_DIFFCRED:
1971 case PRIV_SCHED_SETPRIORITY:
1972 case PRIV_SCHED_RTPRIO:
1973 case PRIV_SCHED_SETPOLICY:
1974 case PRIV_SCHED_SET:
1975 case PRIV_SCHED_SETPARAM:
1976 case PRIV_SCHED_IDPRIO:
1977
1978 /*
1979 * More IPC privileges.
1980 */
1981 case PRIV_SEM_WRITE:
1982
1983 /*
1984 * Allow signaling privileges subject to integrity policy.
1985 */
1986 case PRIV_SIGNAL_DIFFCRED:
1987 case PRIV_SIGNAL_SUGID:
1988
1989 /*
1990 * Allow access to only limited sysctls from lower integrity levels;
1991 * piggy-back on the Jail definition.
1992 */
1993 case PRIV_SYSCTL_WRITEJAIL:
1994
1995 /*
1996 * Allow TTY-based privileges, subject to general device access using
1997 * labels on TTY device nodes, but not console privilege.
1998 */
1999 case PRIV_TTY_DRAINWAIT:
2000 case PRIV_TTY_DTRWAIT:
2001 case PRIV_TTY_EXCLUSIVE:
2002 case PRIV_TTY_STI:
2003 case PRIV_TTY_SETA:
2004
2005 /*
2006 * Grant most VFS privileges, as almost all are in practice bounded
2007 * by more specific checks using labels.
2008 */
2009 case PRIV_VFS_READ:
2010 case PRIV_VFS_WRITE:
2011 case PRIV_VFS_ADMIN:
2012 case PRIV_VFS_EXEC:
2013 case PRIV_VFS_LOOKUP:
2014 case PRIV_VFS_CHFLAGS_DEV:
2015 case PRIV_VFS_CHOWN:
2016 case PRIV_VFS_CHROOT:
2017 case PRIV_VFS_RETAINSUGID:
2018 case PRIV_VFS_EXCEEDQUOTA:
2019 case PRIV_VFS_FCHROOT:
2020 case PRIV_VFS_FHOPEN:
2021 case PRIV_VFS_FHSTATFS:
2022 case PRIV_VFS_GENERATION:
2023 case PRIV_VFS_GETFH:
2024 case PRIV_VFS_GETQUOTA:
2025 case PRIV_VFS_LINK:
2026 case PRIV_VFS_MOUNT:
2027 case PRIV_VFS_MOUNT_OWNER:
2028 case PRIV_VFS_MOUNT_PERM:
2029 case PRIV_VFS_MOUNT_SUIDDIR:
2030 case PRIV_VFS_MOUNT_NONUSER:
2031 case PRIV_VFS_SETGID:
2032 case PRIV_VFS_STICKYFILE:
2033 case PRIV_VFS_SYSFLAGS:
2034 case PRIV_VFS_UNMOUNT:
2035
2036 /*
2037 * Allow VM privileges; it would be nice if these were subject to
2038 * resource limits.
2039 */
2040 case PRIV_VM_MADV_PROTECT:
2041 case PRIV_VM_MLOCK:
2042 case PRIV_VM_MUNLOCK:
2043 case PRIV_VM_SWAP_NOQUOTA:
2044 case PRIV_VM_SWAP_NORLIMIT:
2045
2046 /*
2047 * Allow some but not all network privileges. In general, dont allow
2048 * reconfiguring the network stack, just normal use.
2049 */
2050 case PRIV_NETINET_RESERVEDPORT:
2051 case PRIV_NETINET_RAW:
2052 case PRIV_NETINET_REUSEPORT:
2053 break;
2054
2055 /*
2056 * All remaining system privileges are allow only if the process
2057 * holds privilege with respect to the Biba policy.
2058 */
2059 default:
2060 subj = SLOT(cred->cr_label);
2061 error = biba_subject_privileged(subj);
2062 if (error)
2063 return (error);
2064 }
2065 return (0);
2066 }
2067
2068 static int
biba_proc_check_debug(struct ucred * cred,struct proc * p)2069 biba_proc_check_debug(struct ucred *cred, struct proc *p)
2070 {
2071 struct mac_biba *subj, *obj;
2072
2073 if (!biba_enabled)
2074 return (0);
2075
2076 subj = SLOT(cred->cr_label);
2077 obj = SLOT(p->p_ucred->cr_label);
2078
2079 /* XXX: range checks */
2080 if (!biba_dominate_effective(obj, subj))
2081 return (ESRCH);
2082 if (!biba_dominate_effective(subj, obj))
2083 return (EACCES);
2084
2085 return (0);
2086 }
2087
2088 static int
biba_proc_check_sched(struct ucred * cred,struct proc * p)2089 biba_proc_check_sched(struct ucred *cred, struct proc *p)
2090 {
2091 struct mac_biba *subj, *obj;
2092
2093 if (!biba_enabled)
2094 return (0);
2095
2096 subj = SLOT(cred->cr_label);
2097 obj = SLOT(p->p_ucred->cr_label);
2098
2099 /* XXX: range checks */
2100 if (!biba_dominate_effective(obj, subj))
2101 return (ESRCH);
2102 if (!biba_dominate_effective(subj, obj))
2103 return (EACCES);
2104
2105 return (0);
2106 }
2107
2108 static int
biba_proc_check_signal(struct ucred * cred,struct proc * p,int signum)2109 biba_proc_check_signal(struct ucred *cred, struct proc *p, int signum)
2110 {
2111 struct mac_biba *subj, *obj;
2112
2113 if (!biba_enabled)
2114 return (0);
2115
2116 subj = SLOT(cred->cr_label);
2117 obj = SLOT(p->p_ucred->cr_label);
2118
2119 /* XXX: range checks */
2120 if (!biba_dominate_effective(obj, subj))
2121 return (ESRCH);
2122 if (!biba_dominate_effective(subj, obj))
2123 return (EACCES);
2124
2125 return (0);
2126 }
2127
2128 static int
biba_socket_check_deliver(struct socket * so,struct label * solabel,struct mbuf * m,struct label * mlabel)2129 biba_socket_check_deliver(struct socket *so, struct label *solabel,
2130 struct mbuf *m, struct label *mlabel)
2131 {
2132 struct mac_biba *p, *s;
2133 int error;
2134
2135 if (!biba_enabled)
2136 return (0);
2137
2138 p = SLOT(mlabel);
2139 s = SLOT(solabel);
2140
2141 SOCK_LOCK(so);
2142 error = biba_equal_effective(p, s) ? 0 : EACCES;
2143 SOCK_UNLOCK(so);
2144 return (error);
2145 }
2146
2147 static int
biba_socket_check_relabel(struct ucred * cred,struct socket * so,struct label * solabel,struct label * newlabel)2148 biba_socket_check_relabel(struct ucred *cred, struct socket *so,
2149 struct label *solabel, struct label *newlabel)
2150 {
2151 struct mac_biba *subj, *obj, *new;
2152 int error;
2153
2154 SOCK_LOCK_ASSERT(so);
2155
2156 new = SLOT(newlabel);
2157 subj = SLOT(cred->cr_label);
2158 obj = SLOT(solabel);
2159
2160 /*
2161 * If there is a Biba label update for the socket, it may be an
2162 * update of effective.
2163 */
2164 error = biba_atmostflags(new, MAC_BIBA_FLAG_EFFECTIVE);
2165 if (error)
2166 return (error);
2167
2168 /*
2169 * To relabel a socket, the old socket effective must be in the
2170 * subject range.
2171 */
2172 if (!biba_effective_in_range(obj, subj))
2173 return (EPERM);
2174
2175 /*
2176 * If the Biba label is to be changed, authorize as appropriate.
2177 */
2178 if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) {
2179 /*
2180 * To relabel a socket, the new socket effective must be in
2181 * the subject range.
2182 */
2183 if (!biba_effective_in_range(new, subj))
2184 return (EPERM);
2185
2186 /*
2187 * To change the Biba label on the socket to contain EQUAL,
2188 * the subject must have appropriate privilege.
2189 */
2190 if (biba_contains_equal(new)) {
2191 error = biba_subject_privileged(subj);
2192 if (error)
2193 return (error);
2194 }
2195 }
2196
2197 return (0);
2198 }
2199
2200 static int
biba_socket_check_visible(struct ucred * cred,struct socket * so,struct label * solabel)2201 biba_socket_check_visible(struct ucred *cred, struct socket *so,
2202 struct label *solabel)
2203 {
2204 struct mac_biba *subj, *obj;
2205
2206 if (!biba_enabled)
2207 return (0);
2208
2209 subj = SLOT(cred->cr_label);
2210 obj = SLOT(solabel);
2211
2212 SOCK_LOCK(so);
2213 if (!biba_dominate_effective(obj, subj)) {
2214 SOCK_UNLOCK(so);
2215 return (ENOENT);
2216 }
2217 SOCK_UNLOCK(so);
2218
2219 return (0);
2220 }
2221
2222 static void
biba_socket_create(struct ucred * cred,struct socket * so,struct label * solabel)2223 biba_socket_create(struct ucred *cred, struct socket *so,
2224 struct label *solabel)
2225 {
2226 struct mac_biba *source, *dest;
2227
2228 source = SLOT(cred->cr_label);
2229 dest = SLOT(solabel);
2230
2231 biba_copy_effective(source, dest);
2232 }
2233
2234 static void
biba_socket_create_mbuf(struct socket * so,struct label * solabel,struct mbuf * m,struct label * mlabel)2235 biba_socket_create_mbuf(struct socket *so, struct label *solabel,
2236 struct mbuf *m, struct label *mlabel)
2237 {
2238 struct mac_biba *source, *dest;
2239
2240 source = SLOT(solabel);
2241 dest = SLOT(mlabel);
2242
2243 SOCK_LOCK(so);
2244 biba_copy_effective(source, dest);
2245 SOCK_UNLOCK(so);
2246 }
2247
2248 static void
biba_socket_newconn(struct socket * oldso,struct label * oldsolabel,struct socket * newso,struct label * newsolabel)2249 biba_socket_newconn(struct socket *oldso, struct label *oldsolabel,
2250 struct socket *newso, struct label *newsolabel)
2251 {
2252 struct mac_biba source, *dest;
2253
2254 SOCK_LOCK(oldso);
2255 source = *SLOT(oldsolabel);
2256 SOCK_UNLOCK(oldso);
2257
2258 dest = SLOT(newsolabel);
2259
2260 SOCK_LOCK(newso);
2261 biba_copy_effective(&source, dest);
2262 SOCK_UNLOCK(newso);
2263 }
2264
2265 static void
biba_socket_relabel(struct ucred * cred,struct socket * so,struct label * solabel,struct label * newlabel)2266 biba_socket_relabel(struct ucred *cred, struct socket *so,
2267 struct label *solabel, struct label *newlabel)
2268 {
2269 struct mac_biba *source, *dest;
2270
2271 SOCK_LOCK_ASSERT(so);
2272
2273 source = SLOT(newlabel);
2274 dest = SLOT(solabel);
2275
2276 biba_copy(source, dest);
2277 }
2278
2279 static void
biba_socketpeer_set_from_mbuf(struct mbuf * m,struct label * mlabel,struct socket * so,struct label * sopeerlabel)2280 biba_socketpeer_set_from_mbuf(struct mbuf *m, struct label *mlabel,
2281 struct socket *so, struct label *sopeerlabel)
2282 {
2283 struct mac_biba *source, *dest;
2284
2285 source = SLOT(mlabel);
2286 dest = SLOT(sopeerlabel);
2287
2288 SOCK_LOCK(so);
2289 biba_copy_effective(source, dest);
2290 SOCK_UNLOCK(so);
2291 }
2292
2293 static void
biba_socketpeer_set_from_socket(struct socket * oldso,struct label * oldsolabel,struct socket * newso,struct label * newsopeerlabel)2294 biba_socketpeer_set_from_socket(struct socket *oldso,
2295 struct label *oldsolabel, struct socket *newso,
2296 struct label *newsopeerlabel)
2297 {
2298 struct mac_biba source, *dest;
2299
2300 SOCK_LOCK(oldso);
2301 source = *SLOT(oldsolabel);
2302 SOCK_UNLOCK(oldso);
2303 dest = SLOT(newsopeerlabel);
2304
2305 SOCK_LOCK(newso);
2306 biba_copy_effective(&source, dest);
2307 SOCK_UNLOCK(newso);
2308 }
2309
2310 static void
biba_syncache_create(struct label * label,struct inpcb * inp)2311 biba_syncache_create(struct label *label, struct inpcb *inp)
2312 {
2313 struct mac_biba *source, *dest;
2314
2315 source = SLOT(inp->inp_label);
2316 dest = SLOT(label);
2317 biba_copy_effective(source, dest);
2318 }
2319
2320 static void
biba_syncache_create_mbuf(struct label * sc_label,struct mbuf * m,struct label * mlabel)2321 biba_syncache_create_mbuf(struct label *sc_label, struct mbuf *m,
2322 struct label *mlabel)
2323 {
2324 struct mac_biba *source, *dest;
2325
2326 source = SLOT(sc_label);
2327 dest = SLOT(mlabel);
2328 biba_copy_effective(source, dest);
2329 }
2330
2331 static int
biba_system_check_acct(struct ucred * cred,struct vnode * vp,struct label * vplabel)2332 biba_system_check_acct(struct ucred *cred, struct vnode *vp,
2333 struct label *vplabel)
2334 {
2335 struct mac_biba *subj, *obj;
2336 int error;
2337
2338 if (!biba_enabled)
2339 return (0);
2340
2341 subj = SLOT(cred->cr_label);
2342
2343 error = biba_subject_privileged(subj);
2344 if (error)
2345 return (error);
2346
2347 if (vplabel == NULL)
2348 return (0);
2349
2350 obj = SLOT(vplabel);
2351 if (!biba_high_effective(obj))
2352 return (EACCES);
2353
2354 return (0);
2355 }
2356
2357 static int
biba_system_check_auditctl(struct ucred * cred,struct vnode * vp,struct label * vplabel)2358 biba_system_check_auditctl(struct ucred *cred, struct vnode *vp,
2359 struct label *vplabel)
2360 {
2361 struct mac_biba *subj, *obj;
2362 int error;
2363
2364 if (!biba_enabled)
2365 return (0);
2366
2367 subj = SLOT(cred->cr_label);
2368
2369 error = biba_subject_privileged(subj);
2370 if (error)
2371 return (error);
2372
2373 if (vplabel == NULL)
2374 return (0);
2375
2376 obj = SLOT(vplabel);
2377 if (!biba_high_effective(obj))
2378 return (EACCES);
2379
2380 return (0);
2381 }
2382
2383 static int
biba_system_check_auditon(struct ucred * cred,int cmd)2384 biba_system_check_auditon(struct ucred *cred, int cmd)
2385 {
2386 struct mac_biba *subj;
2387 int error;
2388
2389 if (!biba_enabled)
2390 return (0);
2391
2392 subj = SLOT(cred->cr_label);
2393
2394 error = biba_subject_privileged(subj);
2395 if (error)
2396 return (error);
2397
2398 return (0);
2399 }
2400
2401 static int
biba_system_check_swapoff(struct ucred * cred,struct vnode * vp,struct label * label)2402 biba_system_check_swapoff(struct ucred *cred, struct vnode *vp,
2403 struct label *label)
2404 {
2405 struct mac_biba *subj;
2406 int error;
2407
2408 if (!biba_enabled)
2409 return (0);
2410
2411 subj = SLOT(cred->cr_label);
2412
2413 error = biba_subject_privileged(subj);
2414 if (error)
2415 return (error);
2416
2417 return (0);
2418 }
2419
2420 static int
biba_system_check_swapon(struct ucred * cred,struct vnode * vp,struct label * vplabel)2421 biba_system_check_swapon(struct ucred *cred, struct vnode *vp,
2422 struct label *vplabel)
2423 {
2424 struct mac_biba *subj, *obj;
2425 int error;
2426
2427 if (!biba_enabled)
2428 return (0);
2429
2430 subj = SLOT(cred->cr_label);
2431 obj = SLOT(vplabel);
2432
2433 error = biba_subject_privileged(subj);
2434 if (error)
2435 return (error);
2436
2437 if (!biba_high_effective(obj))
2438 return (EACCES);
2439
2440 return (0);
2441 }
2442
2443 static int
biba_system_check_sysctl(struct ucred * cred,struct sysctl_oid * oidp,void * arg1,int arg2,struct sysctl_req * req)2444 biba_system_check_sysctl(struct ucred *cred, struct sysctl_oid *oidp,
2445 void *arg1, int arg2, struct sysctl_req *req)
2446 {
2447 struct mac_biba *subj;
2448 int error;
2449
2450 if (!biba_enabled)
2451 return (0);
2452
2453 subj = SLOT(cred->cr_label);
2454
2455 /*
2456 * Treat sysctl variables without CTLFLAG_ANYBODY flag as biba/high,
2457 * but also require privilege to change them.
2458 */
2459 if (req->newptr != NULL && (oidp->oid_kind & CTLFLAG_ANYBODY) == 0) {
2460 if (!biba_subject_dominate_high(subj))
2461 return (EACCES);
2462
2463 error = biba_subject_privileged(subj);
2464 if (error)
2465 return (error);
2466 }
2467
2468 return (0);
2469 }
2470
2471 static void
biba_sysvmsg_cleanup(struct label * msglabel)2472 biba_sysvmsg_cleanup(struct label *msglabel)
2473 {
2474
2475 bzero(SLOT(msglabel), sizeof(struct mac_biba));
2476 }
2477
2478 static void
biba_sysvmsg_create(struct ucred * cred,struct msqid_kernel * msqkptr,struct label * msqlabel,struct msg * msgptr,struct label * msglabel)2479 biba_sysvmsg_create(struct ucred *cred, struct msqid_kernel *msqkptr,
2480 struct label *msqlabel, struct msg *msgptr, struct label *msglabel)
2481 {
2482 struct mac_biba *source, *dest;
2483
2484 /* Ignore the msgq label */
2485 source = SLOT(cred->cr_label);
2486 dest = SLOT(msglabel);
2487
2488 biba_copy_effective(source, dest);
2489 }
2490
2491 static int
biba_sysvmsq_check_msgrcv(struct ucred * cred,struct msg * msgptr,struct label * msglabel)2492 biba_sysvmsq_check_msgrcv(struct ucred *cred, struct msg *msgptr,
2493 struct label *msglabel)
2494 {
2495 struct mac_biba *subj, *obj;
2496
2497 if (!biba_enabled)
2498 return (0);
2499
2500 subj = SLOT(cred->cr_label);
2501 obj = SLOT(msglabel);
2502
2503 if (!biba_dominate_effective(obj, subj))
2504 return (EACCES);
2505
2506 return (0);
2507 }
2508
2509 static int
biba_sysvmsq_check_msgrmid(struct ucred * cred,struct msg * msgptr,struct label * msglabel)2510 biba_sysvmsq_check_msgrmid(struct ucred *cred, struct msg *msgptr,
2511 struct label *msglabel)
2512 {
2513 struct mac_biba *subj, *obj;
2514
2515 if (!biba_enabled)
2516 return (0);
2517
2518 subj = SLOT(cred->cr_label);
2519 obj = SLOT(msglabel);
2520
2521 if (!biba_dominate_effective(subj, obj))
2522 return (EACCES);
2523
2524 return (0);
2525 }
2526
2527 static int
biba_sysvmsq_check_msqget(struct ucred * cred,struct msqid_kernel * msqkptr,struct label * msqklabel)2528 biba_sysvmsq_check_msqget(struct ucred *cred, struct msqid_kernel *msqkptr,
2529 struct label *msqklabel)
2530 {
2531 struct mac_biba *subj, *obj;
2532
2533 if (!biba_enabled)
2534 return (0);
2535
2536 subj = SLOT(cred->cr_label);
2537 obj = SLOT(msqklabel);
2538
2539 if (!biba_dominate_effective(obj, subj))
2540 return (EACCES);
2541
2542 return (0);
2543 }
2544
2545 static int
biba_sysvmsq_check_msqsnd(struct ucred * cred,struct msqid_kernel * msqkptr,struct label * msqklabel)2546 biba_sysvmsq_check_msqsnd(struct ucred *cred, struct msqid_kernel *msqkptr,
2547 struct label *msqklabel)
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(msqklabel);
2556
2557 if (!biba_dominate_effective(subj, obj))
2558 return (EACCES);
2559
2560 return (0);
2561 }
2562
2563 static int
biba_sysvmsq_check_msqrcv(struct ucred * cred,struct msqid_kernel * msqkptr,struct label * msqklabel)2564 biba_sysvmsq_check_msqrcv(struct ucred *cred, struct msqid_kernel *msqkptr,
2565 struct label *msqklabel)
2566 {
2567 struct mac_biba *subj, *obj;
2568
2569 if (!biba_enabled)
2570 return (0);
2571
2572 subj = SLOT(cred->cr_label);
2573 obj = SLOT(msqklabel);
2574
2575 if (!biba_dominate_effective(obj, subj))
2576 return (EACCES);
2577
2578 return (0);
2579 }
2580
2581 static int
biba_sysvmsq_check_msqctl(struct ucred * cred,struct msqid_kernel * msqkptr,struct label * msqklabel,int cmd)2582 biba_sysvmsq_check_msqctl(struct ucred *cred, struct msqid_kernel *msqkptr,
2583 struct label *msqklabel, int cmd)
2584 {
2585 struct mac_biba *subj, *obj;
2586
2587 if (!biba_enabled)
2588 return (0);
2589
2590 subj = SLOT(cred->cr_label);
2591 obj = SLOT(msqklabel);
2592
2593 switch(cmd) {
2594 case IPC_RMID:
2595 case IPC_SET:
2596 if (!biba_dominate_effective(subj, obj))
2597 return (EACCES);
2598 break;
2599
2600 case IPC_STAT:
2601 if (!biba_dominate_effective(obj, subj))
2602 return (EACCES);
2603 break;
2604
2605 default:
2606 return (EACCES);
2607 }
2608
2609 return (0);
2610 }
2611
2612 static void
biba_sysvmsq_cleanup(struct label * msqlabel)2613 biba_sysvmsq_cleanup(struct label *msqlabel)
2614 {
2615
2616 bzero(SLOT(msqlabel), sizeof(struct mac_biba));
2617 }
2618
2619 static void
biba_sysvmsq_create(struct ucred * cred,struct msqid_kernel * msqkptr,struct label * msqlabel)2620 biba_sysvmsq_create(struct ucred *cred, struct msqid_kernel *msqkptr,
2621 struct label *msqlabel)
2622 {
2623 struct mac_biba *source, *dest;
2624
2625 source = SLOT(cred->cr_label);
2626 dest = SLOT(msqlabel);
2627
2628 biba_copy_effective(source, dest);
2629 }
2630
2631 static int
biba_sysvsem_check_semctl(struct ucred * cred,struct semid_kernel * semakptr,struct label * semaklabel,int cmd)2632 biba_sysvsem_check_semctl(struct ucred *cred, struct semid_kernel *semakptr,
2633 struct label *semaklabel, int cmd)
2634 {
2635 struct mac_biba *subj, *obj;
2636
2637 if (!biba_enabled)
2638 return (0);
2639
2640 subj = SLOT(cred->cr_label);
2641 obj = SLOT(semaklabel);
2642
2643 switch(cmd) {
2644 case IPC_RMID:
2645 case IPC_SET:
2646 case SETVAL:
2647 case SETALL:
2648 if (!biba_dominate_effective(subj, obj))
2649 return (EACCES);
2650 break;
2651
2652 case IPC_STAT:
2653 case GETVAL:
2654 case GETPID:
2655 case GETNCNT:
2656 case GETZCNT:
2657 case GETALL:
2658 if (!biba_dominate_effective(obj, subj))
2659 return (EACCES);
2660 break;
2661
2662 default:
2663 return (EACCES);
2664 }
2665
2666 return (0);
2667 }
2668
2669 static int
biba_sysvsem_check_semget(struct ucred * cred,struct semid_kernel * semakptr,struct label * semaklabel)2670 biba_sysvsem_check_semget(struct ucred *cred, struct semid_kernel *semakptr,
2671 struct label *semaklabel)
2672 {
2673 struct mac_biba *subj, *obj;
2674
2675 if (!biba_enabled)
2676 return (0);
2677
2678 subj = SLOT(cred->cr_label);
2679 obj = SLOT(semaklabel);
2680
2681 if (!biba_dominate_effective(obj, subj))
2682 return (EACCES);
2683
2684 return (0);
2685 }
2686
2687 static int
biba_sysvsem_check_semop(struct ucred * cred,struct semid_kernel * semakptr,struct label * semaklabel,size_t accesstype)2688 biba_sysvsem_check_semop(struct ucred *cred, struct semid_kernel *semakptr,
2689 struct label *semaklabel, size_t accesstype)
2690 {
2691 struct mac_biba *subj, *obj;
2692
2693 if (!biba_enabled)
2694 return (0);
2695
2696 subj = SLOT(cred->cr_label);
2697 obj = SLOT(semaklabel);
2698
2699 if (accesstype & SEM_R)
2700 if (!biba_dominate_effective(obj, subj))
2701 return (EACCES);
2702
2703 if (accesstype & SEM_A)
2704 if (!biba_dominate_effective(subj, obj))
2705 return (EACCES);
2706
2707 return (0);
2708 }
2709
2710 static void
biba_sysvsem_cleanup(struct label * semalabel)2711 biba_sysvsem_cleanup(struct label *semalabel)
2712 {
2713
2714 bzero(SLOT(semalabel), sizeof(struct mac_biba));
2715 }
2716
2717 static void
biba_sysvsem_create(struct ucred * cred,struct semid_kernel * semakptr,struct label * semalabel)2718 biba_sysvsem_create(struct ucred *cred, struct semid_kernel *semakptr,
2719 struct label *semalabel)
2720 {
2721 struct mac_biba *source, *dest;
2722
2723 source = SLOT(cred->cr_label);
2724 dest = SLOT(semalabel);
2725
2726 biba_copy_effective(source, dest);
2727 }
2728
2729 static int
biba_sysvshm_check_shmat(struct ucred * cred,struct shmid_kernel * shmsegptr,struct label * shmseglabel,int shmflg)2730 biba_sysvshm_check_shmat(struct ucred *cred, struct shmid_kernel *shmsegptr,
2731 struct label *shmseglabel, int shmflg)
2732 {
2733 struct mac_biba *subj, *obj;
2734
2735 if (!biba_enabled)
2736 return (0);
2737
2738 subj = SLOT(cred->cr_label);
2739 obj = SLOT(shmseglabel);
2740
2741 if (!biba_dominate_effective(obj, subj))
2742 return (EACCES);
2743 if ((shmflg & SHM_RDONLY) == 0) {
2744 if (!biba_dominate_effective(subj, obj))
2745 return (EACCES);
2746 }
2747
2748 return (0);
2749 }
2750
2751 static int
biba_sysvshm_check_shmctl(struct ucred * cred,struct shmid_kernel * shmsegptr,struct label * shmseglabel,int cmd)2752 biba_sysvshm_check_shmctl(struct ucred *cred, struct shmid_kernel *shmsegptr,
2753 struct label *shmseglabel, int cmd)
2754 {
2755 struct mac_biba *subj, *obj;
2756
2757 if (!biba_enabled)
2758 return (0);
2759
2760 subj = SLOT(cred->cr_label);
2761 obj = SLOT(shmseglabel);
2762
2763 switch(cmd) {
2764 case IPC_RMID:
2765 case IPC_SET:
2766 if (!biba_dominate_effective(subj, obj))
2767 return (EACCES);
2768 break;
2769
2770 case IPC_STAT:
2771 case SHM_STAT:
2772 if (!biba_dominate_effective(obj, subj))
2773 return (EACCES);
2774 break;
2775
2776 default:
2777 return (EACCES);
2778 }
2779
2780 return (0);
2781 }
2782
2783 static int
biba_sysvshm_check_shmget(struct ucred * cred,struct shmid_kernel * shmsegptr,struct label * shmseglabel,int shmflg)2784 biba_sysvshm_check_shmget(struct ucred *cred, struct shmid_kernel *shmsegptr,
2785 struct label *shmseglabel, int shmflg)
2786 {
2787 struct mac_biba *subj, *obj;
2788
2789 if (!biba_enabled)
2790 return (0);
2791
2792 subj = SLOT(cred->cr_label);
2793 obj = SLOT(shmseglabel);
2794
2795 if (!biba_dominate_effective(obj, subj))
2796 return (EACCES);
2797
2798 return (0);
2799 }
2800
2801 static void
biba_sysvshm_cleanup(struct label * shmlabel)2802 biba_sysvshm_cleanup(struct label *shmlabel)
2803 {
2804
2805 bzero(SLOT(shmlabel), sizeof(struct mac_biba));
2806 }
2807
2808 static void
biba_sysvshm_create(struct ucred * cred,struct shmid_kernel * shmsegptr,struct label * shmlabel)2809 biba_sysvshm_create(struct ucred *cred, struct shmid_kernel *shmsegptr,
2810 struct label *shmlabel)
2811 {
2812 struct mac_biba *source, *dest;
2813
2814 source = SLOT(cred->cr_label);
2815 dest = SLOT(shmlabel);
2816
2817 biba_copy_effective(source, dest);
2818 }
2819
2820 static int
biba_vnode_associate_extattr(struct mount * mp,struct label * mplabel,struct vnode * vp,struct label * vplabel)2821 biba_vnode_associate_extattr(struct mount *mp, struct label *mplabel,
2822 struct vnode *vp, struct label *vplabel)
2823 {
2824 struct mac_biba mb_temp, *source, *dest;
2825 int buflen, error;
2826
2827 source = SLOT(mplabel);
2828 dest = SLOT(vplabel);
2829
2830 buflen = sizeof(mb_temp);
2831 bzero(&mb_temp, buflen);
2832
2833 error = vn_extattr_get(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE,
2834 MAC_BIBA_EXTATTR_NAME, &buflen, (char *) &mb_temp, curthread);
2835 if (error == ENOATTR || error == EOPNOTSUPP) {
2836 /* Fall back to the mntlabel. */
2837 biba_copy_effective(source, dest);
2838 return (0);
2839 } else if (error)
2840 return (error);
2841
2842 if (buflen != sizeof(mb_temp)) {
2843 printf("biba_vnode_associate_extattr: bad size %d\n",
2844 buflen);
2845 return (EPERM);
2846 }
2847 if (biba_valid(&mb_temp) != 0) {
2848 printf("biba_vnode_associate_extattr: invalid\n");
2849 return (EPERM);
2850 }
2851 if ((mb_temp.mb_flags & MAC_BIBA_FLAGS_BOTH) !=
2852 MAC_BIBA_FLAG_EFFECTIVE) {
2853 printf("biba_vnode_associate_extattr: not effective\n");
2854 return (EPERM);
2855 }
2856
2857 biba_copy_effective(&mb_temp, dest);
2858 return (0);
2859 }
2860
2861 static void
biba_vnode_associate_singlelabel(struct mount * mp,struct label * mplabel,struct vnode * vp,struct label * vplabel)2862 biba_vnode_associate_singlelabel(struct mount *mp, struct label *mplabel,
2863 struct vnode *vp, struct label *vplabel)
2864 {
2865 struct mac_biba *source, *dest;
2866
2867 source = SLOT(mplabel);
2868 dest = SLOT(vplabel);
2869
2870 biba_copy_effective(source, dest);
2871 }
2872
2873 static int
biba_vnode_check_chdir(struct ucred * cred,struct vnode * dvp,struct label * dvplabel)2874 biba_vnode_check_chdir(struct ucred *cred, struct vnode *dvp,
2875 struct label *dvplabel)
2876 {
2877 struct mac_biba *subj, *obj;
2878
2879 if (!biba_enabled)
2880 return (0);
2881
2882 subj = SLOT(cred->cr_label);
2883 obj = SLOT(dvplabel);
2884
2885 if (!biba_dominate_effective(obj, subj))
2886 return (EACCES);
2887
2888 return (0);
2889 }
2890
2891 static int
biba_vnode_check_chroot(struct ucred * cred,struct vnode * dvp,struct label * dvplabel)2892 biba_vnode_check_chroot(struct ucred *cred, struct vnode *dvp,
2893 struct label *dvplabel)
2894 {
2895 struct mac_biba *subj, *obj;
2896
2897 if (!biba_enabled)
2898 return (0);
2899
2900 subj = SLOT(cred->cr_label);
2901 obj = SLOT(dvplabel);
2902
2903 if (!biba_dominate_effective(obj, subj))
2904 return (EACCES);
2905
2906 return (0);
2907 }
2908
2909 static int
biba_vnode_check_create(struct ucred * cred,struct vnode * dvp,struct label * dvplabel,struct componentname * cnp,struct vattr * vap)2910 biba_vnode_check_create(struct ucred *cred, struct vnode *dvp,
2911 struct label *dvplabel, struct componentname *cnp, struct vattr *vap)
2912 {
2913 struct mac_biba *subj, *obj;
2914
2915 if (!biba_enabled)
2916 return (0);
2917
2918 subj = SLOT(cred->cr_label);
2919 obj = SLOT(dvplabel);
2920
2921 if (!biba_dominate_effective(subj, obj))
2922 return (EACCES);
2923
2924 return (0);
2925 }
2926
2927 static int
biba_vnode_check_deleteacl(struct ucred * cred,struct vnode * vp,struct label * vplabel,acl_type_t type)2928 biba_vnode_check_deleteacl(struct ucred *cred, struct vnode *vp,
2929 struct label *vplabel, acl_type_t type)
2930 {
2931 struct mac_biba *subj, *obj;
2932
2933 if (!biba_enabled)
2934 return (0);
2935
2936 subj = SLOT(cred->cr_label);
2937 obj = SLOT(vplabel);
2938
2939 if (!biba_dominate_effective(subj, obj))
2940 return (EACCES);
2941
2942 return (0);
2943 }
2944
2945 static int
biba_vnode_check_deleteextattr(struct ucred * cred,struct vnode * vp,struct label * vplabel,int attrnamespace,const char * name)2946 biba_vnode_check_deleteextattr(struct ucred *cred, struct vnode *vp,
2947 struct label *vplabel, int attrnamespace, const char *name)
2948 {
2949 struct mac_biba *subj, *obj;
2950
2951 if (!biba_enabled)
2952 return (0);
2953
2954 subj = SLOT(cred->cr_label);
2955 obj = SLOT(vplabel);
2956
2957 if (!biba_dominate_effective(subj, obj))
2958 return (EACCES);
2959
2960 return (0);
2961 }
2962
2963 static int
biba_vnode_check_exec(struct ucred * cred,struct vnode * vp,struct label * vplabel,struct image_params * imgp,struct label * execlabel)2964 biba_vnode_check_exec(struct ucred *cred, struct vnode *vp,
2965 struct label *vplabel, struct image_params *imgp,
2966 struct label *execlabel)
2967 {
2968 struct mac_biba *subj, *obj, *exec;
2969 int error;
2970
2971 if (execlabel != NULL) {
2972 /*
2973 * We currently don't permit labels to be changed at
2974 * exec-time as part of Biba, so disallow non-NULL Biba label
2975 * elements in the execlabel.
2976 */
2977 exec = SLOT(execlabel);
2978 error = biba_atmostflags(exec, 0);
2979 if (error)
2980 return (error);
2981 }
2982
2983 if (!biba_enabled)
2984 return (0);
2985
2986 subj = SLOT(cred->cr_label);
2987 obj = SLOT(vplabel);
2988
2989 if (!biba_dominate_effective(obj, subj))
2990 return (EACCES);
2991
2992 return (0);
2993 }
2994
2995 static int
biba_vnode_check_getacl(struct ucred * cred,struct vnode * vp,struct label * vplabel,acl_type_t type)2996 biba_vnode_check_getacl(struct ucred *cred, struct vnode *vp,
2997 struct label *vplabel, acl_type_t type)
2998 {
2999 struct mac_biba *subj, *obj;
3000
3001 if (!biba_enabled)
3002 return (0);
3003
3004 subj = SLOT(cred->cr_label);
3005 obj = SLOT(vplabel);
3006
3007 if (!biba_dominate_effective(obj, subj))
3008 return (EACCES);
3009
3010 return (0);
3011 }
3012
3013 static int
biba_vnode_check_getextattr(struct ucred * cred,struct vnode * vp,struct label * vplabel,int attrnamespace,const char * name)3014 biba_vnode_check_getextattr(struct ucred *cred, struct vnode *vp,
3015 struct label *vplabel, int attrnamespace, const char *name)
3016 {
3017 struct mac_biba *subj, *obj;
3018
3019 if (!biba_enabled)
3020 return (0);
3021
3022 subj = SLOT(cred->cr_label);
3023 obj = SLOT(vplabel);
3024
3025 if (!biba_dominate_effective(obj, subj))
3026 return (EACCES);
3027
3028 return (0);
3029 }
3030
3031 static int
biba_vnode_check_link(struct ucred * cred,struct vnode * dvp,struct label * dvplabel,struct vnode * vp,struct label * vplabel,struct componentname * cnp)3032 biba_vnode_check_link(struct ucred *cred, struct vnode *dvp,
3033 struct label *dvplabel, struct vnode *vp, struct label *vplabel,
3034 struct componentname *cnp)
3035 {
3036 struct mac_biba *subj, *obj;
3037
3038 if (!biba_enabled)
3039 return (0);
3040
3041 subj = SLOT(cred->cr_label);
3042 obj = SLOT(dvplabel);
3043
3044 if (!biba_dominate_effective(subj, obj))
3045 return (EACCES);
3046
3047 obj = SLOT(vplabel);
3048
3049 if (!biba_dominate_effective(subj, obj))
3050 return (EACCES);
3051
3052 return (0);
3053 }
3054
3055 static int
biba_vnode_check_listextattr(struct ucred * cred,struct vnode * vp,struct label * vplabel,int attrnamespace)3056 biba_vnode_check_listextattr(struct ucred *cred, struct vnode *vp,
3057 struct label *vplabel, int attrnamespace)
3058 {
3059 struct mac_biba *subj, *obj;
3060
3061 if (!biba_enabled)
3062 return (0);
3063
3064 subj = SLOT(cred->cr_label);
3065 obj = SLOT(vplabel);
3066
3067 if (!biba_dominate_effective(obj, subj))
3068 return (EACCES);
3069
3070 return (0);
3071 }
3072
3073 static int
biba_vnode_check_lookup(struct ucred * cred,struct vnode * dvp,struct label * dvplabel,struct componentname * cnp)3074 biba_vnode_check_lookup(struct ucred *cred, struct vnode *dvp,
3075 struct label *dvplabel, struct componentname *cnp)
3076 {
3077 struct mac_biba *subj, *obj;
3078
3079 if (!biba_enabled)
3080 return (0);
3081
3082 subj = SLOT(cred->cr_label);
3083 obj = SLOT(dvplabel);
3084
3085 if (!biba_dominate_effective(obj, subj))
3086 return (EACCES);
3087
3088 return (0);
3089 }
3090
3091 static int
biba_vnode_check_mmap(struct ucred * cred,struct vnode * vp,struct label * vplabel,int prot,int flags)3092 biba_vnode_check_mmap(struct ucred *cred, struct vnode *vp,
3093 struct label *vplabel, int prot, int flags)
3094 {
3095 struct mac_biba *subj, *obj;
3096
3097 /*
3098 * Rely on the use of open()-time protections to handle
3099 * non-revocation cases.
3100 */
3101 if (!biba_enabled || !revocation_enabled)
3102 return (0);
3103
3104 subj = SLOT(cred->cr_label);
3105 obj = SLOT(vplabel);
3106
3107 if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) {
3108 if (!biba_dominate_effective(obj, subj))
3109 return (EACCES);
3110 }
3111 if (((prot & VM_PROT_WRITE) != 0) && ((flags & MAP_SHARED) != 0)) {
3112 if (!biba_dominate_effective(subj, obj))
3113 return (EACCES);
3114 }
3115
3116 return (0);
3117 }
3118
3119 static int
biba_vnode_check_open(struct ucred * cred,struct vnode * vp,struct label * vplabel,accmode_t accmode)3120 biba_vnode_check_open(struct ucred *cred, struct vnode *vp,
3121 struct label *vplabel, accmode_t accmode)
3122 {
3123 struct mac_biba *subj, *obj;
3124
3125 if (!biba_enabled)
3126 return (0);
3127
3128 subj = SLOT(cred->cr_label);
3129 obj = SLOT(vplabel);
3130
3131 /* XXX privilege override for admin? */
3132 if (accmode & (VREAD | VEXEC | VSTAT_PERMS)) {
3133 if (!biba_dominate_effective(obj, subj))
3134 return (EACCES);
3135 }
3136 if (accmode & VMODIFY_PERMS) {
3137 if (!biba_dominate_effective(subj, obj))
3138 return (EACCES);
3139 }
3140
3141 return (0);
3142 }
3143
3144 static int
biba_vnode_check_poll(struct ucred * active_cred,struct ucred * file_cred,struct vnode * vp,struct label * vplabel)3145 biba_vnode_check_poll(struct ucred *active_cred, struct ucred *file_cred,
3146 struct vnode *vp, struct label *vplabel)
3147 {
3148 struct mac_biba *subj, *obj;
3149
3150 if (!biba_enabled || !revocation_enabled)
3151 return (0);
3152
3153 subj = SLOT(active_cred->cr_label);
3154 obj = SLOT(vplabel);
3155
3156 if (!biba_dominate_effective(obj, subj))
3157 return (EACCES);
3158
3159 return (0);
3160 }
3161
3162 static int
biba_vnode_check_read(struct ucred * active_cred,struct ucred * file_cred,struct vnode * vp,struct label * vplabel)3163 biba_vnode_check_read(struct ucred *active_cred, struct ucred *file_cred,
3164 struct vnode *vp, struct label *vplabel)
3165 {
3166 struct mac_biba *subj, *obj;
3167
3168 if (!biba_enabled || !revocation_enabled)
3169 return (0);
3170
3171 subj = SLOT(active_cred->cr_label);
3172 obj = SLOT(vplabel);
3173
3174 if (!biba_dominate_effective(obj, subj))
3175 return (EACCES);
3176
3177 return (0);
3178 }
3179
3180 static int
biba_vnode_check_readdir(struct ucred * cred,struct vnode * dvp,struct label * dvplabel)3181 biba_vnode_check_readdir(struct ucred *cred, struct vnode *dvp,
3182 struct label *dvplabel)
3183 {
3184 struct mac_biba *subj, *obj;
3185
3186 if (!biba_enabled)
3187 return (0);
3188
3189 subj = SLOT(cred->cr_label);
3190 obj = SLOT(dvplabel);
3191
3192 if (!biba_dominate_effective(obj, subj))
3193 return (EACCES);
3194
3195 return (0);
3196 }
3197
3198 static int
biba_vnode_check_readlink(struct ucred * cred,struct vnode * vp,struct label * vplabel)3199 biba_vnode_check_readlink(struct ucred *cred, struct vnode *vp,
3200 struct label *vplabel)
3201 {
3202 struct mac_biba *subj, *obj;
3203
3204 if (!biba_enabled)
3205 return (0);
3206
3207 subj = SLOT(cred->cr_label);
3208 obj = SLOT(vplabel);
3209
3210 if (!biba_dominate_effective(obj, subj))
3211 return (EACCES);
3212
3213 return (0);
3214 }
3215
3216 static int
biba_vnode_check_relabel(struct ucred * cred,struct vnode * vp,struct label * vplabel,struct label * newlabel)3217 biba_vnode_check_relabel(struct ucred *cred, struct vnode *vp,
3218 struct label *vplabel, struct label *newlabel)
3219 {
3220 struct mac_biba *old, *new, *subj;
3221 int error;
3222
3223 old = SLOT(vplabel);
3224 new = SLOT(newlabel);
3225 subj = SLOT(cred->cr_label);
3226
3227 /*
3228 * If there is a Biba label update for the vnode, it must be a
3229 * effective label.
3230 */
3231 error = biba_atmostflags(new, MAC_BIBA_FLAG_EFFECTIVE);
3232 if (error)
3233 return (error);
3234
3235 /*
3236 * To perform a relabel of the vnode (Biba label or not), Biba must
3237 * authorize the relabel.
3238 */
3239 if (!biba_effective_in_range(old, subj))
3240 return (EPERM);
3241
3242 /*
3243 * If the Biba label is to be changed, authorize as appropriate.
3244 */
3245 if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) {
3246 /*
3247 * To change the Biba label on a vnode, the new vnode label
3248 * must be in the subject range.
3249 */
3250 if (!biba_effective_in_range(new, subj))
3251 return (EPERM);
3252
3253 /*
3254 * To change the Biba label on the vnode to be EQUAL, the
3255 * subject must have appropriate privilege.
3256 */
3257 if (biba_contains_equal(new)) {
3258 error = biba_subject_privileged(subj);
3259 if (error)
3260 return (error);
3261 }
3262 }
3263
3264 return (0);
3265 }
3266
3267 static int
biba_vnode_check_rename_from(struct ucred * cred,struct vnode * dvp,struct label * dvplabel,struct vnode * vp,struct label * vplabel,struct componentname * cnp)3268 biba_vnode_check_rename_from(struct ucred *cred, struct vnode *dvp,
3269 struct label *dvplabel, struct vnode *vp, struct label *vplabel,
3270 struct componentname *cnp)
3271 {
3272 struct mac_biba *subj, *obj;
3273
3274 if (!biba_enabled)
3275 return (0);
3276
3277 subj = SLOT(cred->cr_label);
3278 obj = SLOT(dvplabel);
3279
3280 if (!biba_dominate_effective(subj, obj))
3281 return (EACCES);
3282
3283 obj = SLOT(vplabel);
3284
3285 if (!biba_dominate_effective(subj, obj))
3286 return (EACCES);
3287
3288 return (0);
3289 }
3290
3291 static int
biba_vnode_check_rename_to(struct ucred * cred,struct vnode * dvp,struct label * dvplabel,struct vnode * vp,struct label * vplabel,int samedir,struct componentname * cnp)3292 biba_vnode_check_rename_to(struct ucred *cred, struct vnode *dvp,
3293 struct label *dvplabel, struct vnode *vp, struct label *vplabel,
3294 int samedir, struct componentname *cnp)
3295 {
3296 struct mac_biba *subj, *obj;
3297
3298 if (!biba_enabled)
3299 return (0);
3300
3301 subj = SLOT(cred->cr_label);
3302 obj = SLOT(dvplabel);
3303
3304 if (!biba_dominate_effective(subj, obj))
3305 return (EACCES);
3306
3307 if (vp != NULL) {
3308 obj = SLOT(vplabel);
3309
3310 if (!biba_dominate_effective(subj, obj))
3311 return (EACCES);
3312 }
3313
3314 return (0);
3315 }
3316
3317 static int
biba_vnode_check_revoke(struct ucred * cred,struct vnode * vp,struct label * vplabel)3318 biba_vnode_check_revoke(struct ucred *cred, struct vnode *vp,
3319 struct label *vplabel)
3320 {
3321 struct mac_biba *subj, *obj;
3322
3323 if (!biba_enabled)
3324 return (0);
3325
3326 subj = SLOT(cred->cr_label);
3327 obj = SLOT(vplabel);
3328
3329 if (!biba_dominate_effective(subj, obj))
3330 return (EACCES);
3331
3332 return (0);
3333 }
3334
3335 static int
biba_vnode_check_setacl(struct ucred * cred,struct vnode * vp,struct label * vplabel,acl_type_t type,struct acl * acl)3336 biba_vnode_check_setacl(struct ucred *cred, struct vnode *vp,
3337 struct label *vplabel, acl_type_t type, struct acl *acl)
3338 {
3339 struct mac_biba *subj, *obj;
3340
3341 if (!biba_enabled)
3342 return (0);
3343
3344 subj = SLOT(cred->cr_label);
3345 obj = SLOT(vplabel);
3346
3347 if (!biba_dominate_effective(subj, obj))
3348 return (EACCES);
3349
3350 return (0);
3351 }
3352
3353 static int
biba_vnode_check_setextattr(struct ucred * cred,struct vnode * vp,struct label * vplabel,int attrnamespace,const char * name)3354 biba_vnode_check_setextattr(struct ucred *cred, struct vnode *vp,
3355 struct label *vplabel, int attrnamespace, const char *name)
3356 {
3357 struct mac_biba *subj, *obj;
3358
3359 if (!biba_enabled)
3360 return (0);
3361
3362 subj = SLOT(cred->cr_label);
3363 obj = SLOT(vplabel);
3364
3365 if (!biba_dominate_effective(subj, obj))
3366 return (EACCES);
3367
3368 /* XXX: protect the MAC EA in a special way? */
3369
3370 return (0);
3371 }
3372
3373 static int
biba_vnode_check_setflags(struct ucred * cred,struct vnode * vp,struct label * vplabel,u_long flags)3374 biba_vnode_check_setflags(struct ucred *cred, struct vnode *vp,
3375 struct label *vplabel, u_long flags)
3376 {
3377 struct mac_biba *subj, *obj;
3378
3379 if (!biba_enabled)
3380 return (0);
3381
3382 subj = SLOT(cred->cr_label);
3383 obj = SLOT(vplabel);
3384
3385 if (!biba_dominate_effective(subj, obj))
3386 return (EACCES);
3387
3388 return (0);
3389 }
3390
3391 static int
biba_vnode_check_setmode(struct ucred * cred,struct vnode * vp,struct label * vplabel,mode_t mode)3392 biba_vnode_check_setmode(struct ucred *cred, struct vnode *vp,
3393 struct label *vplabel, mode_t mode)
3394 {
3395 struct mac_biba *subj, *obj;
3396
3397 if (!biba_enabled)
3398 return (0);
3399
3400 subj = SLOT(cred->cr_label);
3401 obj = SLOT(vplabel);
3402
3403 if (!biba_dominate_effective(subj, obj))
3404 return (EACCES);
3405
3406 return (0);
3407 }
3408
3409 static int
biba_vnode_check_setowner(struct ucred * cred,struct vnode * vp,struct label * vplabel,uid_t uid,gid_t gid)3410 biba_vnode_check_setowner(struct ucred *cred, struct vnode *vp,
3411 struct label *vplabel, uid_t uid, gid_t gid)
3412 {
3413 struct mac_biba *subj, *obj;
3414
3415 if (!biba_enabled)
3416 return (0);
3417
3418 subj = SLOT(cred->cr_label);
3419 obj = SLOT(vplabel);
3420
3421 if (!biba_dominate_effective(subj, obj))
3422 return (EACCES);
3423
3424 return (0);
3425 }
3426
3427 static int
biba_vnode_check_setutimes(struct ucred * cred,struct vnode * vp,struct label * vplabel,struct timespec atime,struct timespec mtime)3428 biba_vnode_check_setutimes(struct ucred *cred, struct vnode *vp,
3429 struct label *vplabel, struct timespec atime, struct timespec mtime)
3430 {
3431 struct mac_biba *subj, *obj;
3432
3433 if (!biba_enabled)
3434 return (0);
3435
3436 subj = SLOT(cred->cr_label);
3437 obj = SLOT(vplabel);
3438
3439 if (!biba_dominate_effective(subj, obj))
3440 return (EACCES);
3441
3442 return (0);
3443 }
3444
3445 static int
biba_vnode_check_stat(struct ucred * active_cred,struct ucred * file_cred,struct vnode * vp,struct label * vplabel)3446 biba_vnode_check_stat(struct ucred *active_cred, struct ucred *file_cred,
3447 struct vnode *vp, struct label *vplabel)
3448 {
3449 struct mac_biba *subj, *obj;
3450
3451 if (!biba_enabled)
3452 return (0);
3453
3454 subj = SLOT(active_cred->cr_label);
3455 obj = SLOT(vplabel);
3456
3457 if (!biba_dominate_effective(obj, subj))
3458 return (EACCES);
3459
3460 return (0);
3461 }
3462
3463 static int
biba_vnode_check_unlink(struct ucred * cred,struct vnode * dvp,struct label * dvplabel,struct vnode * vp,struct label * vplabel,struct componentname * cnp)3464 biba_vnode_check_unlink(struct ucred *cred, struct vnode *dvp,
3465 struct label *dvplabel, struct vnode *vp, struct label *vplabel,
3466 struct componentname *cnp)
3467 {
3468 struct mac_biba *subj, *obj;
3469
3470 if (!biba_enabled)
3471 return (0);
3472
3473 subj = SLOT(cred->cr_label);
3474 obj = SLOT(dvplabel);
3475
3476 if (!biba_dominate_effective(subj, obj))
3477 return (EACCES);
3478
3479 obj = SLOT(vplabel);
3480
3481 if (!biba_dominate_effective(subj, obj))
3482 return (EACCES);
3483
3484 return (0);
3485 }
3486
3487 static int
biba_vnode_check_write(struct ucred * active_cred,struct ucred * file_cred,struct vnode * vp,struct label * vplabel)3488 biba_vnode_check_write(struct ucred *active_cred,
3489 struct ucred *file_cred, struct vnode *vp, struct label *vplabel)
3490 {
3491 struct mac_biba *subj, *obj;
3492
3493 if (!biba_enabled || !revocation_enabled)
3494 return (0);
3495
3496 subj = SLOT(active_cred->cr_label);
3497 obj = SLOT(vplabel);
3498
3499 if (!biba_dominate_effective(subj, obj))
3500 return (EACCES);
3501
3502 return (0);
3503 }
3504
3505 static int
biba_vnode_create_extattr(struct ucred * cred,struct mount * mp,struct label * mplabel,struct vnode * dvp,struct label * dvplabel,struct vnode * vp,struct label * vplabel,struct componentname * cnp)3506 biba_vnode_create_extattr(struct ucred *cred, struct mount *mp,
3507 struct label *mplabel, struct vnode *dvp, struct label *dvplabel,
3508 struct vnode *vp, struct label *vplabel, struct componentname *cnp)
3509 {
3510 struct mac_biba *source, *dest, mb_temp;
3511 size_t buflen;
3512 int error;
3513
3514 buflen = sizeof(mb_temp);
3515 bzero(&mb_temp, buflen);
3516
3517 source = SLOT(cred->cr_label);
3518 dest = SLOT(vplabel);
3519 biba_copy_effective(source, &mb_temp);
3520
3521 error = vn_extattr_set(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE,
3522 MAC_BIBA_EXTATTR_NAME, buflen, (char *) &mb_temp, curthread);
3523 if (error == 0)
3524 biba_copy_effective(source, dest);
3525 return (error);
3526 }
3527
3528 static void
biba_vnode_relabel(struct ucred * cred,struct vnode * vp,struct label * vplabel,struct label * newlabel)3529 biba_vnode_relabel(struct ucred *cred, struct vnode *vp,
3530 struct label *vplabel, struct label *newlabel)
3531 {
3532 struct mac_biba *source, *dest;
3533
3534 source = SLOT(newlabel);
3535 dest = SLOT(vplabel);
3536
3537 biba_copy(source, dest);
3538 }
3539
3540 static int
biba_vnode_setlabel_extattr(struct ucred * cred,struct vnode * vp,struct label * vplabel,struct label * intlabel)3541 biba_vnode_setlabel_extattr(struct ucred *cred, struct vnode *vp,
3542 struct label *vplabel, struct label *intlabel)
3543 {
3544 struct mac_biba *source, mb_temp;
3545 size_t buflen;
3546 int error;
3547
3548 buflen = sizeof(mb_temp);
3549 bzero(&mb_temp, buflen);
3550
3551 source = SLOT(intlabel);
3552 if ((source->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) == 0)
3553 return (0);
3554
3555 biba_copy_effective(source, &mb_temp);
3556
3557 error = vn_extattr_set(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE,
3558 MAC_BIBA_EXTATTR_NAME, buflen, (char *) &mb_temp, curthread);
3559 return (error);
3560 }
3561
3562 static struct mac_policy_ops mac_biba_ops =
3563 {
3564 .mpo_init = biba_init,
3565
3566 .mpo_bpfdesc_check_receive = biba_bpfdesc_check_receive,
3567 .mpo_bpfdesc_create = biba_bpfdesc_create,
3568 .mpo_bpfdesc_create_mbuf = biba_bpfdesc_create_mbuf,
3569 .mpo_bpfdesc_destroy_label = biba_destroy_label,
3570 .mpo_bpfdesc_init_label = biba_init_label,
3571
3572 .mpo_cred_associate_nfsd = biba_cred_associate_nfsd,
3573 .mpo_cred_check_relabel = biba_cred_check_relabel,
3574 .mpo_cred_check_visible = biba_cred_check_visible,
3575 .mpo_cred_copy_label = biba_copy_label,
3576 .mpo_cred_create_init = biba_cred_create_init,
3577 .mpo_cred_create_swapper = biba_cred_create_swapper,
3578 .mpo_cred_destroy_label = biba_destroy_label,
3579 .mpo_cred_externalize_label = biba_externalize_label,
3580 .mpo_cred_init_label = biba_init_label,
3581 .mpo_cred_internalize_label = biba_internalize_label,
3582 .mpo_cred_relabel = biba_cred_relabel,
3583
3584 .mpo_devfs_create_device = biba_devfs_create_device,
3585 .mpo_devfs_create_directory = biba_devfs_create_directory,
3586 .mpo_devfs_create_symlink = biba_devfs_create_symlink,
3587 .mpo_devfs_destroy_label = biba_destroy_label,
3588 .mpo_devfs_init_label = biba_init_label,
3589 .mpo_devfs_update = biba_devfs_update,
3590 .mpo_devfs_vnode_associate = biba_devfs_vnode_associate,
3591
3592 .mpo_ifnet_check_relabel = biba_ifnet_check_relabel,
3593 .mpo_ifnet_check_transmit = biba_ifnet_check_transmit,
3594 .mpo_ifnet_copy_label = biba_copy_label,
3595 .mpo_ifnet_create = biba_ifnet_create,
3596 .mpo_ifnet_create_mbuf = biba_ifnet_create_mbuf,
3597 .mpo_ifnet_destroy_label = biba_destroy_label,
3598 .mpo_ifnet_externalize_label = biba_externalize_label,
3599 .mpo_ifnet_init_label = biba_init_label,
3600 .mpo_ifnet_internalize_label = biba_internalize_label,
3601 .mpo_ifnet_relabel = biba_ifnet_relabel,
3602
3603 .mpo_inpcb_check_deliver = biba_inpcb_check_deliver,
3604 .mpo_inpcb_check_visible = biba_inpcb_check_visible,
3605 .mpo_inpcb_create = biba_inpcb_create,
3606 .mpo_inpcb_create_mbuf = biba_inpcb_create_mbuf,
3607 .mpo_inpcb_destroy_label = biba_destroy_label,
3608 .mpo_inpcb_init_label = biba_init_label_waitcheck,
3609 .mpo_inpcb_sosetlabel = biba_inpcb_sosetlabel,
3610
3611 .mpo_ip6q_create = biba_ip6q_create,
3612 .mpo_ip6q_destroy_label = biba_destroy_label,
3613 .mpo_ip6q_init_label = biba_init_label_waitcheck,
3614 .mpo_ip6q_match = biba_ip6q_match,
3615 .mpo_ip6q_reassemble = biba_ip6q_reassemble,
3616 .mpo_ip6q_update = biba_ip6q_update,
3617
3618 .mpo_ipq_create = biba_ipq_create,
3619 .mpo_ipq_destroy_label = biba_destroy_label,
3620 .mpo_ipq_init_label = biba_init_label_waitcheck,
3621 .mpo_ipq_match = biba_ipq_match,
3622 .mpo_ipq_reassemble = biba_ipq_reassemble,
3623 .mpo_ipq_update = biba_ipq_update,
3624
3625 .mpo_kld_check_load = biba_kld_check_load,
3626
3627 .mpo_mbuf_copy_label = biba_copy_label,
3628 .mpo_mbuf_destroy_label = biba_destroy_label,
3629 .mpo_mbuf_init_label = biba_init_label_waitcheck,
3630
3631 .mpo_mount_check_stat = biba_mount_check_stat,
3632 .mpo_mount_create = biba_mount_create,
3633 .mpo_mount_destroy_label = biba_destroy_label,
3634 .mpo_mount_init_label = biba_init_label,
3635
3636 .mpo_netinet_arp_send = biba_netinet_arp_send,
3637 .mpo_netinet_firewall_reply = biba_netinet_firewall_reply,
3638 .mpo_netinet_firewall_send = biba_netinet_firewall_send,
3639 .mpo_netinet_fragment = biba_netinet_fragment,
3640 .mpo_netinet_icmp_reply = biba_netinet_icmp_reply,
3641 .mpo_netinet_igmp_send = biba_netinet_igmp_send,
3642
3643 .mpo_netinet6_nd6_send = biba_netinet6_nd6_send,
3644
3645 .mpo_pipe_check_ioctl = biba_pipe_check_ioctl,
3646 .mpo_pipe_check_poll = biba_pipe_check_poll,
3647 .mpo_pipe_check_read = biba_pipe_check_read,
3648 .mpo_pipe_check_relabel = biba_pipe_check_relabel,
3649 .mpo_pipe_check_stat = biba_pipe_check_stat,
3650 .mpo_pipe_check_write = biba_pipe_check_write,
3651 .mpo_pipe_copy_label = biba_copy_label,
3652 .mpo_pipe_create = biba_pipe_create,
3653 .mpo_pipe_destroy_label = biba_destroy_label,
3654 .mpo_pipe_externalize_label = biba_externalize_label,
3655 .mpo_pipe_init_label = biba_init_label,
3656 .mpo_pipe_internalize_label = biba_internalize_label,
3657 .mpo_pipe_relabel = biba_pipe_relabel,
3658
3659 .mpo_posixsem_check_getvalue = biba_posixsem_check_rdonly,
3660 .mpo_posixsem_check_open = biba_posixsem_check_openunlink,
3661 .mpo_posixsem_check_post = biba_posixsem_check_write,
3662 .mpo_posixsem_check_setmode = biba_posixsem_check_setmode,
3663 .mpo_posixsem_check_setowner = biba_posixsem_check_setowner,
3664 .mpo_posixsem_check_stat = biba_posixsem_check_rdonly,
3665 .mpo_posixsem_check_unlink = biba_posixsem_check_openunlink,
3666 .mpo_posixsem_check_wait = biba_posixsem_check_write,
3667 .mpo_posixsem_create = biba_posixsem_create,
3668 .mpo_posixsem_destroy_label = biba_destroy_label,
3669 .mpo_posixsem_init_label = biba_init_label,
3670
3671 .mpo_posixshm_check_mmap = biba_posixshm_check_mmap,
3672 .mpo_posixshm_check_open = biba_posixshm_check_open,
3673 .mpo_posixshm_check_read = biba_posixshm_check_read,
3674 .mpo_posixshm_check_setmode = biba_posixshm_check_setmode,
3675 .mpo_posixshm_check_setowner = biba_posixshm_check_setowner,
3676 .mpo_posixshm_check_stat = biba_posixshm_check_stat,
3677 .mpo_posixshm_check_truncate = biba_posixshm_check_truncate,
3678 .mpo_posixshm_check_unlink = biba_posixshm_check_unlink,
3679 .mpo_posixshm_check_write = biba_posixshm_check_write,
3680 .mpo_posixshm_create = biba_posixshm_create,
3681 .mpo_posixshm_destroy_label = biba_destroy_label,
3682 .mpo_posixshm_init_label = biba_init_label,
3683
3684 .mpo_priv_check = biba_priv_check,
3685
3686 .mpo_proc_check_debug = biba_proc_check_debug,
3687 .mpo_proc_check_sched = biba_proc_check_sched,
3688 .mpo_proc_check_signal = biba_proc_check_signal,
3689
3690 .mpo_socket_check_deliver = biba_socket_check_deliver,
3691 .mpo_socket_check_relabel = biba_socket_check_relabel,
3692 .mpo_socket_check_visible = biba_socket_check_visible,
3693 .mpo_socket_copy_label = biba_copy_label,
3694 .mpo_socket_create = biba_socket_create,
3695 .mpo_socket_create_mbuf = biba_socket_create_mbuf,
3696 .mpo_socket_destroy_label = biba_destroy_label,
3697 .mpo_socket_externalize_label = biba_externalize_label,
3698 .mpo_socket_init_label = biba_init_label_waitcheck,
3699 .mpo_socket_internalize_label = biba_internalize_label,
3700 .mpo_socket_newconn = biba_socket_newconn,
3701 .mpo_socket_relabel = biba_socket_relabel,
3702
3703 .mpo_socketpeer_destroy_label = biba_destroy_label,
3704 .mpo_socketpeer_externalize_label = biba_externalize_label,
3705 .mpo_socketpeer_init_label = biba_init_label_waitcheck,
3706 .mpo_socketpeer_set_from_mbuf = biba_socketpeer_set_from_mbuf,
3707 .mpo_socketpeer_set_from_socket = biba_socketpeer_set_from_socket,
3708
3709 .mpo_syncache_create = biba_syncache_create,
3710 .mpo_syncache_create_mbuf = biba_syncache_create_mbuf,
3711 .mpo_syncache_destroy_label = biba_destroy_label,
3712 .mpo_syncache_init_label = biba_init_label_waitcheck,
3713
3714 .mpo_system_check_acct = biba_system_check_acct,
3715 .mpo_system_check_auditctl = biba_system_check_auditctl,
3716 .mpo_system_check_auditon = biba_system_check_auditon,
3717 .mpo_system_check_swapoff = biba_system_check_swapoff,
3718 .mpo_system_check_swapon = biba_system_check_swapon,
3719 .mpo_system_check_sysctl = biba_system_check_sysctl,
3720
3721 .mpo_sysvmsg_cleanup = biba_sysvmsg_cleanup,
3722 .mpo_sysvmsg_create = biba_sysvmsg_create,
3723 .mpo_sysvmsg_destroy_label = biba_destroy_label,
3724 .mpo_sysvmsg_init_label = biba_init_label,
3725
3726 .mpo_sysvmsq_check_msgrcv = biba_sysvmsq_check_msgrcv,
3727 .mpo_sysvmsq_check_msgrmid = biba_sysvmsq_check_msgrmid,
3728 .mpo_sysvmsq_check_msqget = biba_sysvmsq_check_msqget,
3729 .mpo_sysvmsq_check_msqsnd = biba_sysvmsq_check_msqsnd,
3730 .mpo_sysvmsq_check_msqrcv = biba_sysvmsq_check_msqrcv,
3731 .mpo_sysvmsq_check_msqctl = biba_sysvmsq_check_msqctl,
3732 .mpo_sysvmsq_cleanup = biba_sysvmsq_cleanup,
3733 .mpo_sysvmsq_create = biba_sysvmsq_create,
3734 .mpo_sysvmsq_destroy_label = biba_destroy_label,
3735 .mpo_sysvmsq_init_label = biba_init_label,
3736
3737 .mpo_sysvsem_check_semctl = biba_sysvsem_check_semctl,
3738 .mpo_sysvsem_check_semget = biba_sysvsem_check_semget,
3739 .mpo_sysvsem_check_semop = biba_sysvsem_check_semop,
3740 .mpo_sysvsem_cleanup = biba_sysvsem_cleanup,
3741 .mpo_sysvsem_create = biba_sysvsem_create,
3742 .mpo_sysvsem_destroy_label = biba_destroy_label,
3743 .mpo_sysvsem_init_label = biba_init_label,
3744
3745 .mpo_sysvshm_check_shmat = biba_sysvshm_check_shmat,
3746 .mpo_sysvshm_check_shmctl = biba_sysvshm_check_shmctl,
3747 .mpo_sysvshm_check_shmget = biba_sysvshm_check_shmget,
3748 .mpo_sysvshm_cleanup = biba_sysvshm_cleanup,
3749 .mpo_sysvshm_create = biba_sysvshm_create,
3750 .mpo_sysvshm_destroy_label = biba_destroy_label,
3751 .mpo_sysvshm_init_label = biba_init_label,
3752
3753 .mpo_vnode_associate_extattr = biba_vnode_associate_extattr,
3754 .mpo_vnode_associate_singlelabel = biba_vnode_associate_singlelabel,
3755 .mpo_vnode_check_access = biba_vnode_check_open,
3756 .mpo_vnode_check_chdir = biba_vnode_check_chdir,
3757 .mpo_vnode_check_chroot = biba_vnode_check_chroot,
3758 .mpo_vnode_check_create = biba_vnode_check_create,
3759 .mpo_vnode_check_deleteacl = biba_vnode_check_deleteacl,
3760 .mpo_vnode_check_deleteextattr = biba_vnode_check_deleteextattr,
3761 .mpo_vnode_check_exec = biba_vnode_check_exec,
3762 .mpo_vnode_check_getacl = biba_vnode_check_getacl,
3763 .mpo_vnode_check_getextattr = biba_vnode_check_getextattr,
3764 .mpo_vnode_check_link = biba_vnode_check_link,
3765 .mpo_vnode_check_listextattr = biba_vnode_check_listextattr,
3766 .mpo_vnode_check_lookup = biba_vnode_check_lookup,
3767 .mpo_vnode_check_mmap = biba_vnode_check_mmap,
3768 .mpo_vnode_check_open = biba_vnode_check_open,
3769 .mpo_vnode_check_poll = biba_vnode_check_poll,
3770 .mpo_vnode_check_read = biba_vnode_check_read,
3771 .mpo_vnode_check_readdir = biba_vnode_check_readdir,
3772 .mpo_vnode_check_readlink = biba_vnode_check_readlink,
3773 .mpo_vnode_check_relabel = biba_vnode_check_relabel,
3774 .mpo_vnode_check_rename_from = biba_vnode_check_rename_from,
3775 .mpo_vnode_check_rename_to = biba_vnode_check_rename_to,
3776 .mpo_vnode_check_revoke = biba_vnode_check_revoke,
3777 .mpo_vnode_check_setacl = biba_vnode_check_setacl,
3778 .mpo_vnode_check_setextattr = biba_vnode_check_setextattr,
3779 .mpo_vnode_check_setflags = biba_vnode_check_setflags,
3780 .mpo_vnode_check_setmode = biba_vnode_check_setmode,
3781 .mpo_vnode_check_setowner = biba_vnode_check_setowner,
3782 .mpo_vnode_check_setutimes = biba_vnode_check_setutimes,
3783 .mpo_vnode_check_stat = biba_vnode_check_stat,
3784 .mpo_vnode_check_unlink = biba_vnode_check_unlink,
3785 .mpo_vnode_check_write = biba_vnode_check_write,
3786 .mpo_vnode_create_extattr = biba_vnode_create_extattr,
3787 .mpo_vnode_copy_label = biba_copy_label,
3788 .mpo_vnode_destroy_label = biba_destroy_label,
3789 .mpo_vnode_externalize_label = biba_externalize_label,
3790 .mpo_vnode_init_label = biba_init_label,
3791 .mpo_vnode_internalize_label = biba_internalize_label,
3792 .mpo_vnode_relabel = biba_vnode_relabel,
3793 .mpo_vnode_setlabel_extattr = biba_vnode_setlabel_extattr,
3794 };
3795
3796 MAC_POLICY_SET(&mac_biba_ops, mac_biba, "TrustedBSD MAC/Biba",
3797 MPC_LOADTIME_FLAG_NOTLATE, &biba_slot);
3798