1 /*-
2 * Copyright (c) 1999-2002, 2007-2009 Robert N. M. Watson
3 * Copyright (c) 2001-2005 Networks Associates Technology, Inc.
4 * Copyright (c) 2006 SPARTA, Inc.
5 * All rights reserved.
6 *
7 * This software was developed by Robert Watson for the TrustedBSD Project.
8 *
9 * This software was developed for the FreeBSD Project in part by NAI Labs,
10 * the Security Research Division of Network Associates, Inc. under
11 * DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA
12 * CHATS research program.
13 *
14 * This software was enhanced by SPARTA ISSO under SPAWAR contract
15 * N66001-04-C-6019 ("SEFOS").
16 *
17 * Redistribution and use in source and binary forms, with or without
18 * modification, are permitted provided that the following conditions
19 * are met:
20 * 1. Redistributions of source code must retain the above copyright
21 * notice, this list of conditions and the following disclaimer.
22 * 2. Redistributions in binary form must reproduce the above copyright
23 * notice, this list of conditions and the following disclaimer in the
24 * documentation and/or other materials provided with the distribution.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 *
38 * $FreeBSD$
39 */
40
41 /*
42 * Developed by the TrustedBSD Project.
43 *
44 * Low-watermark floating label mandatory integrity policy.
45 */
46
47 #include <sys/types.h>
48 #include <sys/param.h>
49 #include <sys/acl.h>
50 #include <sys/conf.h>
51 #include <sys/extattr.h>
52 #include <sys/kernel.h>
53 #include <sys/malloc.h>
54 #include <sys/mman.h>
55 #include <sys/mount.h>
56 #include <sys/priv.h>
57 #include <sys/proc.h>
58 #include <sys/sbuf.h>
59 #include <sys/systm.h>
60 #include <sys/sysproto.h>
61 #include <sys/sysent.h>
62 #include <sys/systm.h>
63 #include <sys/vnode.h>
64 #include <sys/file.h>
65 #include <sys/socket.h>
66 #include <sys/socketvar.h>
67 #include <sys/sx.h>
68 #include <sys/pipe.h>
69 #include <sys/sysctl.h>
70 #include <sys/syslog.h>
71
72 #include <fs/devfs/devfs.h>
73
74 #include <net/bpfdesc.h>
75 #include <net/if.h>
76 #include <net/if_types.h>
77 #include <net/if_var.h>
78
79 #include <netinet/in.h>
80 #include <netinet/in_pcb.h>
81 #include <netinet/ip_var.h>
82
83 #include <vm/vm.h>
84
85 #include <security/mac/mac_policy.h>
86 #include <security/mac/mac_framework.h>
87 #include <security/mac_lomac/mac_lomac.h>
88
89 struct mac_lomac_proc {
90 struct mac_lomac mac_lomac;
91 struct mtx mtx;
92 };
93
94 SYSCTL_DECL(_security_mac);
95
96 SYSCTL_NODE(_security_mac, OID_AUTO, lomac, CTLFLAG_RW, 0,
97 "TrustedBSD mac_lomac policy controls");
98
99 static int lomac_label_size = sizeof(struct mac_lomac);
100 SYSCTL_INT(_security_mac_lomac, OID_AUTO, label_size, CTLFLAG_RD,
101 &lomac_label_size, 0, "Size of struct mac_lomac");
102
103 static int lomac_enabled = 1;
104 SYSCTL_INT(_security_mac_lomac, OID_AUTO, enabled, CTLFLAG_RW,
105 &lomac_enabled, 0, "Enforce MAC/LOMAC policy");
106 TUNABLE_INT("security.mac.lomac.enabled", &lomac_enabled);
107
108 static int destroyed_not_inited;
109 SYSCTL_INT(_security_mac_lomac, OID_AUTO, destroyed_not_inited, CTLFLAG_RD,
110 &destroyed_not_inited, 0, "Count of labels destroyed but not inited");
111
112 static int trust_all_interfaces = 0;
113 SYSCTL_INT(_security_mac_lomac, OID_AUTO, trust_all_interfaces, CTLFLAG_RD,
114 &trust_all_interfaces, 0, "Consider all interfaces 'trusted' by MAC/LOMAC");
115 TUNABLE_INT("security.mac.lomac.trust_all_interfaces", &trust_all_interfaces);
116
117 static char trusted_interfaces[128];
118 SYSCTL_STRING(_security_mac_lomac, OID_AUTO, trusted_interfaces, CTLFLAG_RD,
119 trusted_interfaces, 0, "Interfaces considered 'trusted' by MAC/LOMAC");
120 TUNABLE_STR("security.mac.lomac.trusted_interfaces", trusted_interfaces,
121 sizeof(trusted_interfaces));
122
123 static int ptys_equal = 0;
124 SYSCTL_INT(_security_mac_lomac, OID_AUTO, ptys_equal, CTLFLAG_RW,
125 &ptys_equal, 0, "Label pty devices as lomac/equal on create");
126 TUNABLE_INT("security.mac.lomac.ptys_equal", &ptys_equal);
127
128 static int revocation_enabled = 1;
129 SYSCTL_INT(_security_mac_lomac, OID_AUTO, revocation_enabled, CTLFLAG_RW,
130 &revocation_enabled, 0, "Revoke access to objects on relabel");
131 TUNABLE_INT("security.mac.lomac.revocation_enabled", &revocation_enabled);
132
133 static int lomac_slot;
134 #define SLOT(l) ((struct mac_lomac *)mac_label_get((l), lomac_slot))
135 #define SLOT_SET(l, val) mac_label_set((l), lomac_slot, (uintptr_t)(val))
136 #define PSLOT(l) ((struct mac_lomac_proc *) \
137 mac_label_get((l), lomac_slot))
138 #define PSLOT_SET(l, val) mac_label_set((l), lomac_slot, (uintptr_t)(val))
139
140 MALLOC_DEFINE(M_LOMAC, "mac_lomac_label", "MAC/LOMAC labels");
141
142 static struct mac_lomac *
143 lomac_alloc(int flag)
144 {
145 struct mac_lomac *ml;
146
147 ml = malloc(sizeof(*ml), M_LOMAC, M_ZERO | flag);
148
149 return (ml);
150 }
151
152 static void
153 lomac_free(struct mac_lomac *ml)
154 {
155
156 if (ml != NULL)
157 free(ml, M_LOMAC);
158 else
159 atomic_add_int(&destroyed_not_inited, 1);
160 }
161
162 static int
163 lomac_atmostflags(struct mac_lomac *ml, int flags)
164 {
165
166 if ((ml->ml_flags & flags) != ml->ml_flags)
167 return (EINVAL);
168 return (0);
169 }
170
171 static int
172 lomac_dominate_element(struct mac_lomac_element *a,
173 struct mac_lomac_element *b)
174 {
175
176 switch (a->mle_type) {
177 case MAC_LOMAC_TYPE_EQUAL:
178 case MAC_LOMAC_TYPE_HIGH:
179 return (1);
180
181 case MAC_LOMAC_TYPE_LOW:
182 switch (b->mle_type) {
183 case MAC_LOMAC_TYPE_GRADE:
184 case MAC_LOMAC_TYPE_HIGH:
185 return (0);
186
187 case MAC_LOMAC_TYPE_EQUAL:
188 case MAC_LOMAC_TYPE_LOW:
189 return (1);
190
191 default:
192 panic("lomac_dominate_element: b->mle_type invalid");
193 }
194
195 case MAC_LOMAC_TYPE_GRADE:
196 switch (b->mle_type) {
197 case MAC_LOMAC_TYPE_EQUAL:
198 case MAC_LOMAC_TYPE_LOW:
199 return (1);
200
201 case MAC_LOMAC_TYPE_HIGH:
202 return (0);
203
204 case MAC_LOMAC_TYPE_GRADE:
205 return (a->mle_grade >= b->mle_grade);
206
207 default:
208 panic("lomac_dominate_element: b->mle_type invalid");
209 }
210
211 default:
212 panic("lomac_dominate_element: a->mle_type invalid");
213 }
214 }
215
216 static int
217 lomac_range_in_range(struct mac_lomac *rangea, struct mac_lomac *rangeb)
218 {
219
220 return (lomac_dominate_element(&rangeb->ml_rangehigh,
221 &rangea->ml_rangehigh) &&
222 lomac_dominate_element(&rangea->ml_rangelow,
223 &rangeb->ml_rangelow));
224 }
225
226 static int
227 lomac_single_in_range(struct mac_lomac *single, struct mac_lomac *range)
228 {
229
230 KASSERT((single->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0,
231 ("lomac_single_in_range: a not single"));
232 KASSERT((range->ml_flags & MAC_LOMAC_FLAG_RANGE) != 0,
233 ("lomac_single_in_range: b not range"));
234
235 return (lomac_dominate_element(&range->ml_rangehigh,
236 &single->ml_single) && lomac_dominate_element(&single->ml_single,
237 &range->ml_rangelow));
238 }
239
240 static int
241 lomac_auxsingle_in_range(struct mac_lomac *single, struct mac_lomac *range)
242 {
243
244 KASSERT((single->ml_flags & MAC_LOMAC_FLAG_AUX) != 0,
245 ("lomac_single_in_range: a not auxsingle"));
246 KASSERT((range->ml_flags & MAC_LOMAC_FLAG_RANGE) != 0,
247 ("lomac_single_in_range: b not range"));
248
249 return (lomac_dominate_element(&range->ml_rangehigh,
250 &single->ml_auxsingle) &&
251 lomac_dominate_element(&single->ml_auxsingle,
252 &range->ml_rangelow));
253 }
254
255 static int
256 lomac_dominate_single(struct mac_lomac *a, struct mac_lomac *b)
257 {
258 KASSERT((a->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0,
259 ("lomac_dominate_single: a not single"));
260 KASSERT((b->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0,
261 ("lomac_dominate_single: b not single"));
262
263 return (lomac_dominate_element(&a->ml_single, &b->ml_single));
264 }
265
266 static int
267 lomac_subject_dominate(struct mac_lomac *a, struct mac_lomac *b)
268 {
269 KASSERT((~a->ml_flags &
270 (MAC_LOMAC_FLAG_SINGLE | MAC_LOMAC_FLAG_RANGE)) == 0,
271 ("lomac_dominate_single: a not subject"));
272 KASSERT((b->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0,
273 ("lomac_dominate_single: b not single"));
274
275 return (lomac_dominate_element(&a->ml_rangehigh, &b->ml_single));
276 }
277
278 static int
279 lomac_equal_element(struct mac_lomac_element *a, struct mac_lomac_element *b)
280 {
281
282 if (a->mle_type == MAC_LOMAC_TYPE_EQUAL ||
283 b->mle_type == MAC_LOMAC_TYPE_EQUAL)
284 return (1);
285
286 return (a->mle_type == b->mle_type && a->mle_grade == b->mle_grade);
287 }
288
289 static int
290 lomac_equal_single(struct mac_lomac *a, struct mac_lomac *b)
291 {
292
293 KASSERT((a->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0,
294 ("lomac_equal_single: a not single"));
295 KASSERT((b->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0,
296 ("lomac_equal_single: b not single"));
297
298 return (lomac_equal_element(&a->ml_single, &b->ml_single));
299 }
300
301 static int
302 lomac_contains_equal(struct mac_lomac *ml)
303 {
304
305 if (ml->ml_flags & MAC_LOMAC_FLAG_SINGLE)
306 if (ml->ml_single.mle_type == MAC_LOMAC_TYPE_EQUAL)
307 return (1);
308 if (ml->ml_flags & MAC_LOMAC_FLAG_AUX)
309 if (ml->ml_auxsingle.mle_type == MAC_LOMAC_TYPE_EQUAL)
310 return (1);
311
312 if (ml->ml_flags & MAC_LOMAC_FLAG_RANGE) {
313 if (ml->ml_rangelow.mle_type == MAC_LOMAC_TYPE_EQUAL)
314 return (1);
315 if (ml->ml_rangehigh.mle_type == MAC_LOMAC_TYPE_EQUAL)
316 return (1);
317 }
318
319 return (0);
320 }
321
322 static int
323 lomac_subject_privileged(struct mac_lomac *ml)
324 {
325
326 KASSERT((ml->ml_flags & MAC_LOMAC_FLAGS_BOTH) ==
327 MAC_LOMAC_FLAGS_BOTH,
328 ("lomac_subject_privileged: subject doesn't have both labels"));
329
330 /* If the single is EQUAL, it's ok. */
331 if (ml->ml_single.mle_type == MAC_LOMAC_TYPE_EQUAL)
332 return (0);
333
334 /* If either range endpoint is EQUAL, it's ok. */
335 if (ml->ml_rangelow.mle_type == MAC_LOMAC_TYPE_EQUAL ||
336 ml->ml_rangehigh.mle_type == MAC_LOMAC_TYPE_EQUAL)
337 return (0);
338
339 /* If the range is low-high, it's ok. */
340 if (ml->ml_rangelow.mle_type == MAC_LOMAC_TYPE_LOW &&
341 ml->ml_rangehigh.mle_type == MAC_LOMAC_TYPE_HIGH)
342 return (0);
343
344 /* It's not ok. */
345 return (EPERM);
346 }
347
348 static int
349 lomac_high_single(struct mac_lomac *ml)
350 {
351
352 KASSERT((ml->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0,
353 ("lomac_high_single: mac_lomac not single"));
354
355 return (ml->ml_single.mle_type == MAC_LOMAC_TYPE_HIGH);
356 }
357
358 static int
359 lomac_valid(struct mac_lomac *ml)
360 {
361
362 if (ml->ml_flags & MAC_LOMAC_FLAG_SINGLE) {
363 switch (ml->ml_single.mle_type) {
364 case MAC_LOMAC_TYPE_GRADE:
365 case MAC_LOMAC_TYPE_EQUAL:
366 case MAC_LOMAC_TYPE_HIGH:
367 case MAC_LOMAC_TYPE_LOW:
368 break;
369
370 default:
371 return (EINVAL);
372 }
373 } else {
374 if (ml->ml_single.mle_type != MAC_LOMAC_TYPE_UNDEF)
375 return (EINVAL);
376 }
377
378 if (ml->ml_flags & MAC_LOMAC_FLAG_AUX) {
379 switch (ml->ml_auxsingle.mle_type) {
380 case MAC_LOMAC_TYPE_GRADE:
381 case MAC_LOMAC_TYPE_EQUAL:
382 case MAC_LOMAC_TYPE_HIGH:
383 case MAC_LOMAC_TYPE_LOW:
384 break;
385
386 default:
387 return (EINVAL);
388 }
389 } else {
390 if (ml->ml_auxsingle.mle_type != MAC_LOMAC_TYPE_UNDEF)
391 return (EINVAL);
392 }
393
394 if (ml->ml_flags & MAC_LOMAC_FLAG_RANGE) {
395 switch (ml->ml_rangelow.mle_type) {
396 case MAC_LOMAC_TYPE_GRADE:
397 case MAC_LOMAC_TYPE_EQUAL:
398 case MAC_LOMAC_TYPE_HIGH:
399 case MAC_LOMAC_TYPE_LOW:
400 break;
401
402 default:
403 return (EINVAL);
404 }
405
406 switch (ml->ml_rangehigh.mle_type) {
407 case MAC_LOMAC_TYPE_GRADE:
408 case MAC_LOMAC_TYPE_EQUAL:
409 case MAC_LOMAC_TYPE_HIGH:
410 case MAC_LOMAC_TYPE_LOW:
411 break;
412
413 default:
414 return (EINVAL);
415 }
416 if (!lomac_dominate_element(&ml->ml_rangehigh,
417 &ml->ml_rangelow))
418 return (EINVAL);
419 } else {
420 if (ml->ml_rangelow.mle_type != MAC_LOMAC_TYPE_UNDEF ||
421 ml->ml_rangehigh.mle_type != MAC_LOMAC_TYPE_UNDEF)
422 return (EINVAL);
423 }
424
425 return (0);
426 }
427
428 static void
429 lomac_set_range(struct mac_lomac *ml, u_short typelow, u_short gradelow,
430 u_short typehigh, u_short gradehigh)
431 {
432
433 ml->ml_rangelow.mle_type = typelow;
434 ml->ml_rangelow.mle_grade = gradelow;
435 ml->ml_rangehigh.mle_type = typehigh;
436 ml->ml_rangehigh.mle_grade = gradehigh;
437 ml->ml_flags |= MAC_LOMAC_FLAG_RANGE;
438 }
439
440 static void
441 lomac_set_single(struct mac_lomac *ml, u_short type, u_short grade)
442 {
443
444 ml->ml_single.mle_type = type;
445 ml->ml_single.mle_grade = grade;
446 ml->ml_flags |= MAC_LOMAC_FLAG_SINGLE;
447 }
448
449 static void
450 lomac_copy_range(struct mac_lomac *labelfrom, struct mac_lomac *labelto)
451 {
452
453 KASSERT((labelfrom->ml_flags & MAC_LOMAC_FLAG_RANGE) != 0,
454 ("lomac_copy_range: labelfrom not range"));
455
456 labelto->ml_rangelow = labelfrom->ml_rangelow;
457 labelto->ml_rangehigh = labelfrom->ml_rangehigh;
458 labelto->ml_flags |= MAC_LOMAC_FLAG_RANGE;
459 }
460
461 static void
462 lomac_copy_single(struct mac_lomac *labelfrom, struct mac_lomac *labelto)
463 {
464
465 KASSERT((labelfrom->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0,
466 ("lomac_copy_single: labelfrom not single"));
467
468 labelto->ml_single = labelfrom->ml_single;
469 labelto->ml_flags |= MAC_LOMAC_FLAG_SINGLE;
470 }
471
472 static void
473 lomac_copy_auxsingle(struct mac_lomac *labelfrom, struct mac_lomac *labelto)
474 {
475
476 KASSERT((labelfrom->ml_flags & MAC_LOMAC_FLAG_AUX) != 0,
477 ("lomac_copy_auxsingle: labelfrom not auxsingle"));
478
479 labelto->ml_auxsingle = labelfrom->ml_auxsingle;
480 labelto->ml_flags |= MAC_LOMAC_FLAG_AUX;
481 }
482
483 static void
484 lomac_copy(struct mac_lomac *source, struct mac_lomac *dest)
485 {
486
487 if (source->ml_flags & MAC_LOMAC_FLAG_SINGLE)
488 lomac_copy_single(source, dest);
489 if (source->ml_flags & MAC_LOMAC_FLAG_AUX)
490 lomac_copy_auxsingle(source, dest);
491 if (source->ml_flags & MAC_LOMAC_FLAG_RANGE)
492 lomac_copy_range(source, dest);
493 }
494
495 static int lomac_to_string(struct sbuf *sb, struct mac_lomac *ml);
496
497 static int
498 maybe_demote(struct mac_lomac *subjlabel, struct mac_lomac *objlabel,
499 const char *actionname, const char *objname, struct vnode *vp)
500 {
501 struct sbuf subjlabel_sb, subjtext_sb, objlabel_sb;
502 char *subjlabeltext, *objlabeltext, *subjtext;
503 struct mac_lomac cached_subjlabel;
504 struct mac_lomac_proc *subj;
505 struct vattr va;
506 struct proc *p;
507 pid_t pgid;
508
509 subj = PSLOT(curthread->td_proc->p_label);
510
511 p = curthread->td_proc;
512 mtx_lock(&subj->mtx);
513 if (subj->mac_lomac.ml_flags & MAC_LOMAC_FLAG_UPDATE) {
514 /*
515 * Check to see if the pending demotion would be more or less
516 * severe than this one, and keep the more severe. This can
517 * only happen for a multi-threaded application.
518 */
519 if (lomac_dominate_single(objlabel, &subj->mac_lomac)) {
520 mtx_unlock(&subj->mtx);
521 return (0);
522 }
523 }
524 bzero(&subj->mac_lomac, sizeof(subj->mac_lomac));
525 /*
526 * Always demote the single label.
527 */
528 lomac_copy_single(objlabel, &subj->mac_lomac);
529 /*
530 * Start with the original range, then minimize each side of the
531 * range to the point of not dominating the object. The high side
532 * will always be demoted, of course.
533 */
534 lomac_copy_range(subjlabel, &subj->mac_lomac);
535 if (!lomac_dominate_element(&objlabel->ml_single,
536 &subj->mac_lomac.ml_rangelow))
537 subj->mac_lomac.ml_rangelow = objlabel->ml_single;
538 subj->mac_lomac.ml_rangehigh = objlabel->ml_single;
539 subj->mac_lomac.ml_flags |= MAC_LOMAC_FLAG_UPDATE;
540 thread_lock(curthread);
541 curthread->td_flags |= TDF_ASTPENDING | TDF_MACPEND;
542 thread_unlock(curthread);
543
544 /*
545 * Avoid memory allocation while holding a mutex; cache the label.
546 */
547 lomac_copy_single(&subj->mac_lomac, &cached_subjlabel);
548 mtx_unlock(&subj->mtx);
549
550 sbuf_new(&subjlabel_sb, NULL, 0, SBUF_AUTOEXTEND);
551 lomac_to_string(&subjlabel_sb, subjlabel);
552 sbuf_finish(&subjlabel_sb);
553 subjlabeltext = sbuf_data(&subjlabel_sb);
554
555 sbuf_new(&subjtext_sb, NULL, 0, SBUF_AUTOEXTEND);
556 lomac_to_string(&subjtext_sb, &subj->mac_lomac);
557 sbuf_finish(&subjtext_sb);
558 subjtext = sbuf_data(&subjtext_sb);
559
560 sbuf_new(&objlabel_sb, NULL, 0, SBUF_AUTOEXTEND);
561 lomac_to_string(&objlabel_sb, objlabel);
562 sbuf_finish(&objlabel_sb);
563 objlabeltext = sbuf_data(&objlabel_sb);
564
565 pgid = p->p_pgrp->pg_id; /* XXX could be stale? */
566 if (vp != NULL && VOP_GETATTR(vp, &va, curthread->td_ucred) == 0) {
567 log(LOG_INFO, "LOMAC: level-%s subject p%dg%du%d:%s demoted to"
568 " level %s after %s a level-%s %s (inode=%ld, "
569 "mountpount=%s)\n",
570 subjlabeltext, p->p_pid, pgid, curthread->td_ucred->cr_uid,
571 p->p_comm, subjtext, actionname, objlabeltext, objname,
572 va.va_fileid, vp->v_mount->mnt_stat.f_mntonname);
573 } else {
574 log(LOG_INFO, "LOMAC: level-%s subject p%dg%du%d:%s demoted to"
575 " level %s after %s a level-%s %s\n",
576 subjlabeltext, p->p_pid, pgid, curthread->td_ucred->cr_uid,
577 p->p_comm, subjtext, actionname, objlabeltext, objname);
578 }
579
580 sbuf_delete(&subjlabel_sb);
581 sbuf_delete(&subjtext_sb);
582 sbuf_delete(&objlabel_sb);
583
584 return (0);
585 }
586
587 /*
588 * Relabel "to" to "from" only if "from" is a valid label (contains at least
589 * a single), as for a relabel operation which may or may not involve a
590 * relevant label.
591 */
592 static void
593 try_relabel(struct mac_lomac *from, struct mac_lomac *to)
594 {
595
596 if (from->ml_flags & MAC_LOMAC_FLAG_SINGLE) {
597 bzero(to, sizeof(*to));
598 lomac_copy(from, to);
599 }
600 }
601
602 /*
603 * Policy module operations.
604 */
605 static void
606 lomac_init(struct mac_policy_conf *conf)
607 {
608
609 }
610
611 /*
612 * Label operations.
613 */
614 static void
615 lomac_init_label(struct label *label)
616 {
617
618 SLOT_SET(label, lomac_alloc(M_WAITOK));
619 }
620
621 static int
622 lomac_init_label_waitcheck(struct label *label, int flag)
623 {
624
625 SLOT_SET(label, lomac_alloc(flag));
626 if (SLOT(label) == NULL)
627 return (ENOMEM);
628
629 return (0);
630 }
631
632 static void
633 lomac_destroy_label(struct label *label)
634 {
635
636 lomac_free(SLOT(label));
637 SLOT_SET(label, NULL);
638 }
639
640 static int
641 lomac_element_to_string(struct sbuf *sb, struct mac_lomac_element *element)
642 {
643
644 switch (element->mle_type) {
645 case MAC_LOMAC_TYPE_HIGH:
646 return (sbuf_printf(sb, "high"));
647
648 case MAC_LOMAC_TYPE_LOW:
649 return (sbuf_printf(sb, "low"));
650
651 case MAC_LOMAC_TYPE_EQUAL:
652 return (sbuf_printf(sb, "equal"));
653
654 case MAC_LOMAC_TYPE_GRADE:
655 return (sbuf_printf(sb, "%d", element->mle_grade));
656
657 default:
658 panic("lomac_element_to_string: invalid type (%d)",
659 element->mle_type);
660 }
661 }
662
663 static int
664 lomac_to_string(struct sbuf *sb, struct mac_lomac *ml)
665 {
666
667 if (ml->ml_flags & MAC_LOMAC_FLAG_SINGLE) {
668 if (lomac_element_to_string(sb, &ml->ml_single) == -1)
669 return (EINVAL);
670 }
671
672 if (ml->ml_flags & MAC_LOMAC_FLAG_AUX) {
673 if (sbuf_putc(sb, '[') == -1)
674 return (EINVAL);
675
676 if (lomac_element_to_string(sb, &ml->ml_auxsingle) == -1)
677 return (EINVAL);
678
679 if (sbuf_putc(sb, ']') == -1)
680 return (EINVAL);
681 }
682
683 if (ml->ml_flags & MAC_LOMAC_FLAG_RANGE) {
684 if (sbuf_putc(sb, '(') == -1)
685 return (EINVAL);
686
687 if (lomac_element_to_string(sb, &ml->ml_rangelow) == -1)
688 return (EINVAL);
689
690 if (sbuf_putc(sb, '-') == -1)
691 return (EINVAL);
692
693 if (lomac_element_to_string(sb, &ml->ml_rangehigh) == -1)
694 return (EINVAL);
695
696 if (sbuf_putc(sb, ')') == -1)
697 return (EINVAL);
698 }
699
700 return (0);
701 }
702
703 static int
704 lomac_externalize_label(struct label *label, char *element_name,
705 struct sbuf *sb, int *claimed)
706 {
707 struct mac_lomac *ml;
708
709 if (strcmp(MAC_LOMAC_LABEL_NAME, element_name) != 0)
710 return (0);
711
712 (*claimed)++;
713
714 ml = SLOT(label);
715
716 return (lomac_to_string(sb, ml));
717 }
718
719 static int
720 lomac_parse_element(struct mac_lomac_element *element, char *string)
721 {
722
723 if (strcmp(string, "high") == 0 || strcmp(string, "hi") == 0) {
724 element->mle_type = MAC_LOMAC_TYPE_HIGH;
725 element->mle_grade = MAC_LOMAC_TYPE_UNDEF;
726 } else if (strcmp(string, "low") == 0 || strcmp(string, "lo") == 0) {
727 element->mle_type = MAC_LOMAC_TYPE_LOW;
728 element->mle_grade = MAC_LOMAC_TYPE_UNDEF;
729 } else if (strcmp(string, "equal") == 0 ||
730 strcmp(string, "eq") == 0) {
731 element->mle_type = MAC_LOMAC_TYPE_EQUAL;
732 element->mle_grade = MAC_LOMAC_TYPE_UNDEF;
733 } else {
734 char *p0, *p1;
735 int d;
736
737 p0 = string;
738 d = strtol(p0, &p1, 10);
739
740 if (d < 0 || d > 65535)
741 return (EINVAL);
742 element->mle_type = MAC_LOMAC_TYPE_GRADE;
743 element->mle_grade = d;
744
745 if (p1 == p0 || *p1 != '\0')
746 return (EINVAL);
747 }
748
749 return (0);
750 }
751
752 /*
753 * Note: destructively consumes the string, make a local copy before calling
754 * if that's a problem.
755 */
756 static int
757 lomac_parse(struct mac_lomac *ml, char *string)
758 {
759 char *range, *rangeend, *rangehigh, *rangelow, *single, *auxsingle,
760 *auxsingleend;
761 int error;
762
763 /* Do we have a range? */
764 single = string;
765 range = index(string, '(');
766 if (range == single)
767 single = NULL;
768 auxsingle = index(string, '[');
769 if (auxsingle == single)
770 single = NULL;
771 if (range != NULL && auxsingle != NULL)
772 return (EINVAL);
773 rangelow = rangehigh = NULL;
774 if (range != NULL) {
775 /* Nul terminate the end of the single string. */
776 *range = '\0';
777 range++;
778 rangelow = range;
779 rangehigh = index(rangelow, '-');
780 if (rangehigh == NULL)
781 return (EINVAL);
782 rangehigh++;
783 if (*rangelow == '\0' || *rangehigh == '\0')
784 return (EINVAL);
785 rangeend = index(rangehigh, ')');
786 if (rangeend == NULL)
787 return (EINVAL);
788 if (*(rangeend + 1) != '\0')
789 return (EINVAL);
790 /* Nul terminate the ends of the ranges. */
791 *(rangehigh - 1) = '\0';
792 *rangeend = '\0';
793 }
794 KASSERT((rangelow != NULL && rangehigh != NULL) ||
795 (rangelow == NULL && rangehigh == NULL),
796 ("lomac_internalize_label: range mismatch"));
797 if (auxsingle != NULL) {
798 /* Nul terminate the end of the single string. */
799 *auxsingle = '\0';
800 auxsingle++;
801 auxsingleend = index(auxsingle, ']');
802 if (auxsingleend == NULL)
803 return (EINVAL);
804 if (*(auxsingleend + 1) != '\0')
805 return (EINVAL);
806 /* Nul terminate the end of the auxsingle. */
807 *auxsingleend = '\0';
808 }
809
810 bzero(ml, sizeof(*ml));
811 if (single != NULL) {
812 error = lomac_parse_element(&ml->ml_single, single);
813 if (error)
814 return (error);
815 ml->ml_flags |= MAC_LOMAC_FLAG_SINGLE;
816 }
817
818 if (auxsingle != NULL) {
819 error = lomac_parse_element(&ml->ml_auxsingle, auxsingle);
820 if (error)
821 return (error);
822 ml->ml_flags |= MAC_LOMAC_FLAG_AUX;
823 }
824
825 if (rangelow != NULL) {
826 error = lomac_parse_element(&ml->ml_rangelow, rangelow);
827 if (error)
828 return (error);
829 error = lomac_parse_element(&ml->ml_rangehigh, rangehigh);
830 if (error)
831 return (error);
832 ml->ml_flags |= MAC_LOMAC_FLAG_RANGE;
833 }
834
835 error = lomac_valid(ml);
836 if (error)
837 return (error);
838
839 return (0);
840 }
841
842 static int
843 lomac_internalize_label(struct label *label, char *element_name,
844 char *element_data, int *claimed)
845 {
846 struct mac_lomac *ml, ml_temp;
847 int error;
848
849 if (strcmp(MAC_LOMAC_LABEL_NAME, element_name) != 0)
850 return (0);
851
852 (*claimed)++;
853
854 error = lomac_parse(&ml_temp, element_data);
855 if (error)
856 return (error);
857
858 ml = SLOT(label);
859 *ml = ml_temp;
860
861 return (0);
862 }
863
864 static void
865 lomac_copy_label(struct label *src, struct label *dest)
866 {
867
868 *SLOT(dest) = *SLOT(src);
869 }
870
871 /*
872 * Object-specific entry point implementations are sorted alphabetically by
873 * object type name and then by operation.
874 */
875 static int
876 lomac_bpfdesc_check_receive(struct bpf_d *d, struct label *dlabel,
877 struct ifnet *ifp, struct label *ifplabel)
878 {
879 struct mac_lomac *a, *b;
880
881 if (!lomac_enabled)
882 return (0);
883
884 a = SLOT(dlabel);
885 b = SLOT(ifplabel);
886
887 if (lomac_equal_single(a, b))
888 return (0);
889 return (EACCES);
890 }
891
892 static void
893 lomac_bpfdesc_create(struct ucred *cred, struct bpf_d *d,
894 struct label *dlabel)
895 {
896 struct mac_lomac *source, *dest;
897
898 source = SLOT(cred->cr_label);
899 dest = SLOT(dlabel);
900
901 lomac_copy_single(source, dest);
902 }
903
904 static void
905 lomac_bpfdesc_create_mbuf(struct bpf_d *d, struct label *dlabel,
906 struct mbuf *m, struct label *mlabel)
907 {
908 struct mac_lomac *source, *dest;
909
910 source = SLOT(dlabel);
911 dest = SLOT(mlabel);
912
913 lomac_copy_single(source, dest);
914 }
915
916 static int
917 lomac_cred_check_relabel(struct ucred *cred, struct label *newlabel)
918 {
919 struct mac_lomac *subj, *new;
920 int error;
921
922 subj = SLOT(cred->cr_label);
923 new = SLOT(newlabel);
924
925 /*
926 * If there is a LOMAC label update for the credential, it may be an
927 * update of the single, range, or both.
928 */
929 error = lomac_atmostflags(new, MAC_LOMAC_FLAGS_BOTH);
930 if (error)
931 return (error);
932
933 /*
934 * If the LOMAC label is to be changed, authorize as appropriate.
935 */
936 if (new->ml_flags & MAC_LOMAC_FLAGS_BOTH) {
937 /*
938 * Fill in the missing parts from the previous label.
939 */
940 if ((new->ml_flags & MAC_LOMAC_FLAG_SINGLE) == 0)
941 lomac_copy_single(subj, new);
942 if ((new->ml_flags & MAC_LOMAC_FLAG_RANGE) == 0)
943 lomac_copy_range(subj, new);
944
945 /*
946 * To change the LOMAC range on a credential, the new range
947 * label must be in the current range.
948 */
949 if (!lomac_range_in_range(new, subj))
950 return (EPERM);
951
952 /*
953 * To change the LOMAC single label on a credential, the new
954 * single label must be in the new range. Implicitly from
955 * the previous check, the new single is in the old range.
956 */
957 if (!lomac_single_in_range(new, new))
958 return (EPERM);
959
960 /*
961 * To have EQUAL in any component of the new credential LOMAC
962 * label, the subject must already have EQUAL in their label.
963 */
964 if (lomac_contains_equal(new)) {
965 error = lomac_subject_privileged(subj);
966 if (error)
967 return (error);
968 }
969
970 /*
971 * XXXMAC: Additional consistency tests regarding the single
972 * and range of the new label might be performed here.
973 */
974 }
975
976 return (0);
977 }
978
979 static int
980 lomac_cred_check_visible(struct ucred *cr1, struct ucred *cr2)
981 {
982 struct mac_lomac *subj, *obj;
983
984 if (!lomac_enabled)
985 return (0);
986
987 subj = SLOT(cr1->cr_label);
988 obj = SLOT(cr2->cr_label);
989
990 /* XXX: range */
991 if (!lomac_dominate_single(obj, subj))
992 return (ESRCH);
993
994 return (0);
995 }
996
997 static void
998 lomac_cred_create_init(struct ucred *cred)
999 {
1000 struct mac_lomac *dest;
1001
1002 dest = SLOT(cred->cr_label);
1003
1004 lomac_set_single(dest, MAC_LOMAC_TYPE_HIGH, 0);
1005 lomac_set_range(dest, MAC_LOMAC_TYPE_LOW, 0, MAC_LOMAC_TYPE_HIGH, 0);
1006 }
1007
1008 static void
1009 lomac_cred_create_swapper(struct ucred *cred)
1010 {
1011 struct mac_lomac *dest;
1012
1013 dest = SLOT(cred->cr_label);
1014
1015 lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0);
1016 lomac_set_range(dest, MAC_LOMAC_TYPE_LOW, 0, MAC_LOMAC_TYPE_HIGH, 0);
1017 }
1018
1019 static void
1020 lomac_cred_relabel(struct ucred *cred, struct label *newlabel)
1021 {
1022 struct mac_lomac *source, *dest;
1023
1024 source = SLOT(newlabel);
1025 dest = SLOT(cred->cr_label);
1026
1027 try_relabel(source, dest);
1028 }
1029
1030 static void
1031 lomac_devfs_create_device(struct ucred *cred, struct mount *mp,
1032 struct cdev *dev, struct devfs_dirent *de, struct label *delabel)
1033 {
1034 struct mac_lomac *ml;
1035 int lomac_type;
1036
1037 ml = SLOT(delabel);
1038 if (strcmp(dev->si_name, "null") == 0 ||
1039 strcmp(dev->si_name, "zero") == 0 ||
1040 strcmp(dev->si_name, "random") == 0 ||
1041 strncmp(dev->si_name, "fd/", strlen("fd/")) == 0 ||
1042 strncmp(dev->si_name, "ttyv", strlen("ttyv")) == 0)
1043 lomac_type = MAC_LOMAC_TYPE_EQUAL;
1044 else if (ptys_equal &&
1045 (strncmp(dev->si_name, "ttyp", strlen("ttyp")) == 0 ||
1046 strncmp(dev->si_name, "ptyp", strlen("ptyp")) == 0))
1047 lomac_type = MAC_LOMAC_TYPE_EQUAL;
1048 else
1049 lomac_type = MAC_LOMAC_TYPE_HIGH;
1050 lomac_set_single(ml, lomac_type, 0);
1051 }
1052
1053 static void
1054 lomac_devfs_create_directory(struct mount *mp, char *dirname, int dirnamelen,
1055 struct devfs_dirent *de, struct label *delabel)
1056 {
1057 struct mac_lomac *ml;
1058
1059 ml = SLOT(delabel);
1060 lomac_set_single(ml, MAC_LOMAC_TYPE_HIGH, 0);
1061 }
1062
1063 static void
1064 lomac_devfs_create_symlink(struct ucred *cred, struct mount *mp,
1065 struct devfs_dirent *dd, struct label *ddlabel, struct devfs_dirent *de,
1066 struct label *delabel)
1067 {
1068 struct mac_lomac *source, *dest;
1069
1070 source = SLOT(cred->cr_label);
1071 dest = SLOT(delabel);
1072
1073 lomac_copy_single(source, dest);
1074 }
1075
1076 static void
1077 lomac_devfs_update(struct mount *mp, struct devfs_dirent *de,
1078 struct label *delabel, struct vnode *vp, struct label *vplabel)
1079 {
1080 struct mac_lomac *source, *dest;
1081
1082 source = SLOT(vplabel);
1083 dest = SLOT(delabel);
1084
1085 lomac_copy(source, dest);
1086 }
1087
1088 static void
1089 lomac_devfs_vnode_associate(struct mount *mp, struct label *mplabel,
1090 struct devfs_dirent *de, struct label *delabel, struct vnode *vp,
1091 struct label *vplabel)
1092 {
1093 struct mac_lomac *source, *dest;
1094
1095 source = SLOT(delabel);
1096 dest = SLOT(vplabel);
1097
1098 lomac_copy_single(source, dest);
1099 }
1100
1101 static int
1102 lomac_ifnet_check_relabel(struct ucred *cred, struct ifnet *ifp,
1103 struct label *ifplabel, struct label *newlabel)
1104 {
1105 struct mac_lomac *subj, *new;
1106 int error;
1107
1108 subj = SLOT(cred->cr_label);
1109 new = SLOT(newlabel);
1110
1111 /*
1112 * If there is a LOMAC label update for the interface, it may be an
1113 * update of the single, range, or both.
1114 */
1115 error = lomac_atmostflags(new, MAC_LOMAC_FLAGS_BOTH);
1116 if (error)
1117 return (error);
1118
1119 /*
1120 * Relabling network interfaces requires LOMAC privilege.
1121 */
1122 error = lomac_subject_privileged(subj);
1123 if (error)
1124 return (error);
1125
1126 /*
1127 * If the LOMAC label is to be changed, authorize as appropriate.
1128 */
1129 if (new->ml_flags & MAC_LOMAC_FLAGS_BOTH) {
1130 /*
1131 * Fill in the missing parts from the previous label.
1132 */
1133 if ((new->ml_flags & MAC_LOMAC_FLAG_SINGLE) == 0)
1134 lomac_copy_single(subj, new);
1135 if ((new->ml_flags & MAC_LOMAC_FLAG_RANGE) == 0)
1136 lomac_copy_range(subj, new);
1137
1138 /*
1139 * Rely on the traditional superuser status for the LOMAC
1140 * interface relabel requirements. XXXMAC: This will go
1141 * away.
1142 *
1143 * XXXRW: This is also redundant to a higher layer check.
1144 */
1145 error = priv_check_cred(cred, PRIV_NET_SETIFMAC, 0);
1146 if (error)
1147 return (EPERM);
1148
1149 /*
1150 * XXXMAC: Additional consistency tests regarding the single
1151 * and the range of the new label might be performed here.
1152 */
1153 }
1154
1155 return (0);
1156 }
1157
1158 static int
1159 lomac_ifnet_check_transmit(struct ifnet *ifp, struct label *ifplabel,
1160 struct mbuf *m, struct label *mlabel)
1161 {
1162 struct mac_lomac *p, *i;
1163
1164 if (!lomac_enabled)
1165 return (0);
1166
1167 p = SLOT(mlabel);
1168 i = SLOT(ifplabel);
1169
1170 return (lomac_single_in_range(p, i) ? 0 : EACCES);
1171 }
1172
1173 static void
1174 lomac_ifnet_create(struct ifnet *ifp, struct label *ifplabel)
1175 {
1176 char tifname[IFNAMSIZ], *p, *q;
1177 char tiflist[sizeof(trusted_interfaces)];
1178 struct mac_lomac *dest;
1179 int len, grade;
1180
1181 dest = SLOT(ifplabel);
1182
1183 if (ifp->if_type == IFT_LOOP) {
1184 grade = MAC_LOMAC_TYPE_EQUAL;
1185 goto set;
1186 }
1187
1188 if (trust_all_interfaces) {
1189 grade = MAC_LOMAC_TYPE_HIGH;
1190 goto set;
1191 }
1192
1193 grade = MAC_LOMAC_TYPE_LOW;
1194
1195 if (trusted_interfaces[0] == '\0' ||
1196 !strvalid(trusted_interfaces, sizeof(trusted_interfaces)))
1197 goto set;
1198
1199 bzero(tiflist, sizeof(tiflist));
1200 for (p = trusted_interfaces, q = tiflist; *p != '\0'; p++, q++)
1201 if(*p != ' ' && *p != '\t')
1202 *q = *p;
1203
1204 for (p = q = tiflist;; p++) {
1205 if (*p == ',' || *p == '\0') {
1206 len = p - q;
1207 if (len < IFNAMSIZ) {
1208 bzero(tifname, sizeof(tifname));
1209 bcopy(q, tifname, len);
1210 if (strcmp(tifname, ifp->if_xname) == 0) {
1211 grade = MAC_LOMAC_TYPE_HIGH;
1212 break;
1213 }
1214 }
1215 else {
1216 *p = '\0';
1217 printf("MAC/LOMAC warning: interface name "
1218 "\"%s\" is too long (must be < %d)\n",
1219 q, IFNAMSIZ);
1220 }
1221 if (*p == '\0')
1222 break;
1223 q = p + 1;
1224 }
1225 }
1226 set:
1227 lomac_set_single(dest, grade, 0);
1228 lomac_set_range(dest, grade, 0, grade, 0);
1229 }
1230
1231 static void
1232 lomac_ifnet_create_mbuf(struct ifnet *ifp, struct label *ifplabel,
1233 struct mbuf *m, struct label *mlabel)
1234 {
1235 struct mac_lomac *source, *dest;
1236
1237 source = SLOT(ifplabel);
1238 dest = SLOT(mlabel);
1239
1240 lomac_copy_single(source, dest);
1241 }
1242
1243 static void
1244 lomac_ifnet_relabel(struct ucred *cred, struct ifnet *ifp,
1245 struct label *ifplabel, struct label *newlabel)
1246 {
1247 struct mac_lomac *source, *dest;
1248
1249 source = SLOT(newlabel);
1250 dest = SLOT(ifplabel);
1251
1252 try_relabel(source, dest);
1253 }
1254
1255 static int
1256 lomac_inpcb_check_deliver(struct inpcb *inp, struct label *inplabel,
1257 struct mbuf *m, struct label *mlabel)
1258 {
1259 struct mac_lomac *p, *i;
1260
1261 if (!lomac_enabled)
1262 return (0);
1263
1264 p = SLOT(mlabel);
1265 i = SLOT(inplabel);
1266
1267 return (lomac_equal_single(p, i) ? 0 : EACCES);
1268 }
1269
1270 static int
1271 lomac_inpcb_check_visible(struct ucred *cred, struct inpcb *inp,
1272 struct label *inplabel)
1273 {
1274 struct mac_lomac *subj, *obj;
1275
1276 if (!lomac_enabled)
1277 return (0);
1278
1279 subj = SLOT(cred->cr_label);
1280 obj = SLOT(inplabel);
1281
1282 if (!lomac_dominate_single(obj, subj))
1283 return (ENOENT);
1284
1285 return (0);
1286 }
1287
1288 static void
1289 lomac_inpcb_create(struct socket *so, struct label *solabel,
1290 struct inpcb *inp, struct label *inplabel)
1291 {
1292 struct mac_lomac *source, *dest;
1293
1294 source = SLOT(solabel);
1295 dest = SLOT(inplabel);
1296
1297 lomac_copy_single(source, dest);
1298 }
1299
1300 static void
1301 lomac_inpcb_create_mbuf(struct inpcb *inp, struct label *inplabel,
1302 struct mbuf *m, struct label *mlabel)
1303 {
1304 struct mac_lomac *source, *dest;
1305
1306 source = SLOT(inplabel);
1307 dest = SLOT(mlabel);
1308
1309 lomac_copy_single(source, dest);
1310 }
1311
1312 static void
1313 lomac_inpcb_sosetlabel(struct socket *so, struct label *solabel,
1314 struct inpcb *inp, struct label *inplabel)
1315 {
1316 struct mac_lomac *source, *dest;
1317
1318 SOCK_LOCK_ASSERT(so);
1319
1320 source = SLOT(solabel);
1321 dest = SLOT(inplabel);
1322
1323 lomac_copy_single(source, dest);
1324 }
1325
1326 static void
1327 lomac_ip6q_create(struct mbuf *m, struct label *mlabel, struct ip6q *q6,
1328 struct label *q6label)
1329 {
1330 struct mac_lomac *source, *dest;
1331
1332 source = SLOT(mlabel);
1333 dest = SLOT(q6label);
1334
1335 lomac_copy_single(source, dest);
1336 }
1337
1338 static int
1339 lomac_ip6q_match(struct mbuf *m, struct label *mlabel, struct ip6q *q6,
1340 struct label *q6label)
1341 {
1342 struct mac_lomac *a, *b;
1343
1344 a = SLOT(q6label);
1345 b = SLOT(mlabel);
1346
1347 return (lomac_equal_single(a, b));
1348 }
1349
1350 static void
1351 lomac_ip6q_reassemble(struct ip6q *q6, struct label *q6label, struct mbuf *m,
1352 struct label *mlabel)
1353 {
1354 struct mac_lomac *source, *dest;
1355
1356 source = SLOT(q6label);
1357 dest = SLOT(mlabel);
1358
1359 /* Just use the head, since we require them all to match. */
1360 lomac_copy_single(source, dest);
1361 }
1362
1363 static void
1364 lomac_ip6q_update(struct mbuf *m, struct label *mlabel, struct ip6q *q6,
1365 struct label *q6label)
1366 {
1367
1368 /* NOOP: we only accept matching labels, so no need to update */
1369 }
1370
1371 static void
1372 lomac_ipq_create(struct mbuf *m, struct label *mlabel, struct ipq *q,
1373 struct label *qlabel)
1374 {
1375 struct mac_lomac *source, *dest;
1376
1377 source = SLOT(mlabel);
1378 dest = SLOT(qlabel);
1379
1380 lomac_copy_single(source, dest);
1381 }
1382
1383 static int
1384 lomac_ipq_match(struct mbuf *m, struct label *mlabel, struct ipq *q,
1385 struct label *qlabel)
1386 {
1387 struct mac_lomac *a, *b;
1388
1389 a = SLOT(qlabel);
1390 b = SLOT(mlabel);
1391
1392 return (lomac_equal_single(a, b));
1393 }
1394
1395 static void
1396 lomac_ipq_reassemble(struct ipq *q, struct label *qlabel, struct mbuf *m,
1397 struct label *mlabel)
1398 {
1399 struct mac_lomac *source, *dest;
1400
1401 source = SLOT(qlabel);
1402 dest = SLOT(mlabel);
1403
1404 /* Just use the head, since we require them all to match. */
1405 lomac_copy_single(source, dest);
1406 }
1407
1408 static void
1409 lomac_ipq_update(struct mbuf *m, struct label *mlabel, struct ipq *q,
1410 struct label *qlabel)
1411 {
1412
1413 /* NOOP: we only accept matching labels, so no need to update */
1414 }
1415
1416 static int
1417 lomac_kld_check_load(struct ucred *cred, struct vnode *vp,
1418 struct label *vplabel)
1419 {
1420 struct mac_lomac *subj, *obj;
1421
1422 if (!lomac_enabled)
1423 return (0);
1424
1425 subj = SLOT(cred->cr_label);
1426 obj = SLOT(vplabel);
1427
1428 if (lomac_subject_privileged(subj))
1429 return (EPERM);
1430
1431 if (!lomac_high_single(obj))
1432 return (EACCES);
1433
1434 return (0);
1435 }
1436
1437 static void
1438 lomac_mount_create(struct ucred *cred, struct mount *mp,
1439 struct label *mplabel)
1440 {
1441 struct mac_lomac *source, *dest;
1442
1443 source = SLOT(cred->cr_label);
1444 dest = SLOT(mplabel);
1445 lomac_copy_single(source, dest);
1446 }
1447
1448 static void
1449 lomac_netatalk_aarp_send(struct ifnet *ifp, struct label *ifplabel,
1450 struct mbuf *m, struct label *mlabel)
1451 {
1452 struct mac_lomac *dest;
1453
1454 dest = SLOT(mlabel);
1455
1456 lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0);
1457 }
1458
1459 static void
1460 lomac_netinet_arp_send(struct ifnet *ifp, struct label *ifplabel,
1461 struct mbuf *m, struct label *mlabel)
1462 {
1463 struct mac_lomac *dest;
1464
1465 dest = SLOT(mlabel);
1466
1467 lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0);
1468 }
1469
1470 static void
1471 lomac_netinet_firewall_reply(struct mbuf *mrecv, struct label *mrecvlabel,
1472 struct mbuf *msend, struct label *msendlabel)
1473 {
1474 struct mac_lomac *source, *dest;
1475
1476 source = SLOT(mrecvlabel);
1477 dest = SLOT(msendlabel);
1478
1479 lomac_copy_single(source, dest);
1480 }
1481
1482 static void
1483 lomac_netinet_firewall_send(struct mbuf *m, struct label *mlabel)
1484 {
1485 struct mac_lomac *dest;
1486
1487 dest = SLOT(mlabel);
1488
1489 /* XXX: where is the label for the firewall really comming from? */
1490 lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0);
1491 }
1492
1493 static void
1494 lomac_netinet_fragment(struct mbuf *m, struct label *mlabel,
1495 struct mbuf *frag, struct label *fraglabel)
1496 {
1497 struct mac_lomac *source, *dest;
1498
1499 source = SLOT(mlabel);
1500 dest = SLOT(fraglabel);
1501
1502 lomac_copy_single(source, dest);
1503 }
1504
1505 static void
1506 lomac_netinet_icmp_reply(struct mbuf *mrecv, struct label *mrecvlabel,
1507 struct mbuf *msend, struct label *msendlabel)
1508 {
1509 struct mac_lomac *source, *dest;
1510
1511 source = SLOT(mrecvlabel);
1512 dest = SLOT(msendlabel);
1513
1514 lomac_copy_single(source, dest);
1515 }
1516
1517 static void
1518 lomac_netinet_igmp_send(struct ifnet *ifp, struct label *ifplabel,
1519 struct mbuf *m, struct label *mlabel)
1520 {
1521 struct mac_lomac *dest;
1522
1523 dest = SLOT(mlabel);
1524
1525 lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0);
1526 }
1527
1528 static void
1529 lomac_netinet6_nd6_send(struct ifnet *ifp, struct label *ifplabel,
1530 struct mbuf *m, struct label *mlabel)
1531 {
1532 struct mac_lomac *dest;
1533
1534 dest = SLOT(mlabel);
1535
1536 lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0);
1537 }
1538
1539 static int
1540 lomac_pipe_check_ioctl(struct ucred *cred, struct pipepair *pp,
1541 struct label *pplabel, unsigned long cmd, void /* caddr_t */ *data)
1542 {
1543
1544 if (!lomac_enabled)
1545 return (0);
1546
1547 /* XXX: This will be implemented soon... */
1548
1549 return (0);
1550 }
1551
1552 static int
1553 lomac_pipe_check_read(struct ucred *cred, struct pipepair *pp,
1554 struct label *pplabel)
1555 {
1556 struct mac_lomac *subj, *obj;
1557
1558 if (!lomac_enabled)
1559 return (0);
1560
1561 subj = SLOT(cred->cr_label);
1562 obj = SLOT(pplabel);
1563
1564 if (!lomac_dominate_single(obj, subj))
1565 return (maybe_demote(subj, obj, "reading", "pipe", NULL));
1566
1567 return (0);
1568 }
1569
1570 static int
1571 lomac_pipe_check_relabel(struct ucred *cred, struct pipepair *pp,
1572 struct label *pplabel, struct label *newlabel)
1573 {
1574 struct mac_lomac *subj, *obj, *new;
1575 int error;
1576
1577 new = SLOT(newlabel);
1578 subj = SLOT(cred->cr_label);
1579 obj = SLOT(pplabel);
1580
1581 /*
1582 * If there is a LOMAC label update for a pipe, it must be a single
1583 * update.
1584 */
1585 error = lomac_atmostflags(new, MAC_LOMAC_FLAG_SINGLE);
1586 if (error)
1587 return (error);
1588
1589 /*
1590 * To perform a relabel of a pipe (LOMAC label or not), LOMAC must
1591 * authorize the relabel.
1592 */
1593 if (!lomac_single_in_range(obj, subj))
1594 return (EPERM);
1595
1596 /*
1597 * If the LOMAC label is to be changed, authorize as appropriate.
1598 */
1599 if (new->ml_flags & MAC_LOMAC_FLAG_SINGLE) {
1600 /*
1601 * To change the LOMAC label on a pipe, the new pipe label
1602 * must be in the subject range.
1603 */
1604 if (!lomac_single_in_range(new, subj))
1605 return (EPERM);
1606
1607 /*
1608 * To change the LOMAC label on a pipe to be EQUAL, the
1609 * subject must have appropriate privilege.
1610 */
1611 if (lomac_contains_equal(new)) {
1612 error = lomac_subject_privileged(subj);
1613 if (error)
1614 return (error);
1615 }
1616 }
1617
1618 return (0);
1619 }
1620
1621 static int
1622 lomac_pipe_check_write(struct ucred *cred, struct pipepair *pp,
1623 struct label *pplabel)
1624 {
1625 struct mac_lomac *subj, *obj;
1626
1627 if (!lomac_enabled)
1628 return (0);
1629
1630 subj = SLOT(cred->cr_label);
1631 obj = SLOT(pplabel);
1632
1633 if (!lomac_subject_dominate(subj, obj))
1634 return (EACCES);
1635
1636 return (0);
1637 }
1638
1639 static void
1640 lomac_pipe_create(struct ucred *cred, struct pipepair *pp,
1641 struct label *pplabel)
1642 {
1643 struct mac_lomac *source, *dest;
1644
1645 source = SLOT(cred->cr_label);
1646 dest = SLOT(pplabel);
1647
1648 lomac_copy_single(source, dest);
1649 }
1650
1651 static void
1652 lomac_pipe_relabel(struct ucred *cred, struct pipepair *pp,
1653 struct label *pplabel, struct label *newlabel)
1654 {
1655 struct mac_lomac *source, *dest;
1656
1657 source = SLOT(newlabel);
1658 dest = SLOT(pplabel);
1659
1660 try_relabel(source, dest);
1661 }
1662
1663 /*
1664 * Some system privileges are allowed regardless of integrity grade; others
1665 * are allowed only when running with privilege with respect to the LOMAC
1666 * policy as they might otherwise allow bypassing of the integrity policy.
1667 */
1668 static int
1669 lomac_priv_check(struct ucred *cred, int priv)
1670 {
1671 struct mac_lomac *subj;
1672 int error;
1673
1674 if (!lomac_enabled)
1675 return (0);
1676
1677 /*
1678 * Exempt only specific privileges from the LOMAC integrity policy.
1679 */
1680 switch (priv) {
1681 case PRIV_KTRACE:
1682 case PRIV_MSGBUF:
1683
1684 /*
1685 * Allow processes to manipulate basic process audit properties, and
1686 * to submit audit records.
1687 */
1688 case PRIV_AUDIT_GETAUDIT:
1689 case PRIV_AUDIT_SETAUDIT:
1690 case PRIV_AUDIT_SUBMIT:
1691
1692 /*
1693 * Allow processes to manipulate their regular UNIX credentials.
1694 */
1695 case PRIV_CRED_SETUID:
1696 case PRIV_CRED_SETEUID:
1697 case PRIV_CRED_SETGID:
1698 case PRIV_CRED_SETEGID:
1699 case PRIV_CRED_SETGROUPS:
1700 case PRIV_CRED_SETREUID:
1701 case PRIV_CRED_SETREGID:
1702 case PRIV_CRED_SETRESUID:
1703 case PRIV_CRED_SETRESGID:
1704
1705 /*
1706 * Allow processes to perform system monitoring.
1707 */
1708 case PRIV_SEEOTHERGIDS:
1709 case PRIV_SEEOTHERUIDS:
1710 break;
1711
1712 /*
1713 * Allow access to general process debugging facilities. We
1714 * separately control debugging based on MAC label.
1715 */
1716 case PRIV_DEBUG_DIFFCRED:
1717 case PRIV_DEBUG_SUGID:
1718 case PRIV_DEBUG_UNPRIV:
1719
1720 /*
1721 * Allow manipulating jails.
1722 */
1723 case PRIV_JAIL_ATTACH:
1724
1725 /*
1726 * Allow privilege with respect to the Partition policy, but not the
1727 * Privs policy.
1728 */
1729 case PRIV_MAC_PARTITION:
1730
1731 /*
1732 * Allow privilege with respect to process resource limits and login
1733 * context.
1734 */
1735 case PRIV_PROC_LIMIT:
1736 case PRIV_PROC_SETLOGIN:
1737 case PRIV_PROC_SETRLIMIT:
1738
1739 /*
1740 * Allow System V and POSIX IPC privileges.
1741 */
1742 case PRIV_IPC_READ:
1743 case PRIV_IPC_WRITE:
1744 case PRIV_IPC_ADMIN:
1745 case PRIV_IPC_MSGSIZE:
1746 case PRIV_MQ_ADMIN:
1747
1748 /*
1749 * Allow certain scheduler manipulations -- possibly this should be
1750 * controlled by more fine-grained policy, as potentially low
1751 * integrity processes can deny CPU to higher integrity ones.
1752 */
1753 case PRIV_SCHED_DIFFCRED:
1754 case PRIV_SCHED_SETPRIORITY:
1755 case PRIV_SCHED_RTPRIO:
1756 case PRIV_SCHED_SETPOLICY:
1757 case PRIV_SCHED_SET:
1758 case PRIV_SCHED_SETPARAM:
1759
1760 /*
1761 * More IPC privileges.
1762 */
1763 case PRIV_SEM_WRITE:
1764
1765 /*
1766 * Allow signaling privileges subject to integrity policy.
1767 */
1768 case PRIV_SIGNAL_DIFFCRED:
1769 case PRIV_SIGNAL_SUGID:
1770
1771 /*
1772 * Allow access to only limited sysctls from lower integrity levels;
1773 * piggy-back on the Jail definition.
1774 */
1775 case PRIV_SYSCTL_WRITEJAIL:
1776
1777 /*
1778 * Allow TTY-based privileges, subject to general device access using
1779 * labels on TTY device nodes, but not console privilege.
1780 */
1781 case PRIV_TTY_DRAINWAIT:
1782 case PRIV_TTY_DTRWAIT:
1783 case PRIV_TTY_EXCLUSIVE:
1784 case PRIV_TTY_STI:
1785 case PRIV_TTY_SETA:
1786
1787 /*
1788 * Grant most VFS privileges, as almost all are in practice bounded
1789 * by more specific checks using labels.
1790 */
1791 case PRIV_VFS_READ:
1792 case PRIV_VFS_WRITE:
1793 case PRIV_VFS_ADMIN:
1794 case PRIV_VFS_EXEC:
1795 case PRIV_VFS_LOOKUP:
1796 case PRIV_VFS_CHFLAGS_DEV:
1797 case PRIV_VFS_CHOWN:
1798 case PRIV_VFS_CHROOT:
1799 case PRIV_VFS_RETAINSUGID:
1800 case PRIV_VFS_EXCEEDQUOTA:
1801 case PRIV_VFS_FCHROOT:
1802 case PRIV_VFS_FHOPEN:
1803 case PRIV_VFS_FHSTATFS:
1804 case PRIV_VFS_GENERATION:
1805 case PRIV_VFS_GETFH:
1806 case PRIV_VFS_GETQUOTA:
1807 case PRIV_VFS_LINK:
1808 case PRIV_VFS_MOUNT:
1809 case PRIV_VFS_MOUNT_OWNER:
1810 case PRIV_VFS_MOUNT_PERM:
1811 case PRIV_VFS_MOUNT_SUIDDIR:
1812 case PRIV_VFS_MOUNT_NONUSER:
1813 case PRIV_VFS_SETGID:
1814 case PRIV_VFS_STICKYFILE:
1815 case PRIV_VFS_SYSFLAGS:
1816 case PRIV_VFS_UNMOUNT:
1817
1818 /*
1819 * Allow VM privileges; it would be nice if these were subject to
1820 * resource limits.
1821 */
1822 case PRIV_VM_MADV_PROTECT:
1823 case PRIV_VM_MLOCK:
1824 case PRIV_VM_MUNLOCK:
1825 case PRIV_VM_SWAP_NOQUOTA:
1826 case PRIV_VM_SWAP_NORLIMIT:
1827
1828 /*
1829 * Allow some but not all network privileges. In general, dont allow
1830 * reconfiguring the network stack, just normal use.
1831 */
1832 case PRIV_NETATALK_RESERVEDPORT:
1833 case PRIV_NETINET_RESERVEDPORT:
1834 case PRIV_NETINET_RAW:
1835 case PRIV_NETINET_REUSEPORT:
1836 case PRIV_NETIPX_RESERVEDPORT:
1837 case PRIV_NETIPX_RAW:
1838 break;
1839
1840 /*
1841 * All remaining system privileges are allow only if the process
1842 * holds privilege with respect to the LOMAC policy.
1843 */
1844 default:
1845 subj = SLOT(cred->cr_label);
1846 error = lomac_subject_privileged(subj);
1847 if (error)
1848 return (error);
1849 }
1850 return (0);
1851 }
1852
1853 static int
1854 lomac_proc_check_debug(struct ucred *cred, struct proc *p)
1855 {
1856 struct mac_lomac *subj, *obj;
1857
1858 if (!lomac_enabled)
1859 return (0);
1860
1861 subj = SLOT(cred->cr_label);
1862 obj = SLOT(p->p_ucred->cr_label);
1863
1864 /* XXX: range checks */
1865 if (!lomac_dominate_single(obj, subj))
1866 return (ESRCH);
1867 if (!lomac_subject_dominate(subj, obj))
1868 return (EACCES);
1869
1870 return (0);
1871 }
1872
1873 static int
1874 lomac_proc_check_sched(struct ucred *cred, struct proc *p)
1875 {
1876 struct mac_lomac *subj, *obj;
1877
1878 if (!lomac_enabled)
1879 return (0);
1880
1881 subj = SLOT(cred->cr_label);
1882 obj = SLOT(p->p_ucred->cr_label);
1883
1884 /* XXX: range checks */
1885 if (!lomac_dominate_single(obj, subj))
1886 return (ESRCH);
1887 if (!lomac_subject_dominate(subj, obj))
1888 return (EACCES);
1889
1890 return (0);
1891 }
1892
1893 static int
1894 lomac_proc_check_signal(struct ucred *cred, struct proc *p, int signum)
1895 {
1896 struct mac_lomac *subj, *obj;
1897
1898 if (!lomac_enabled)
1899 return (0);
1900
1901 subj = SLOT(cred->cr_label);
1902 obj = SLOT(p->p_ucred->cr_label);
1903
1904 /* XXX: range checks */
1905 if (!lomac_dominate_single(obj, subj))
1906 return (ESRCH);
1907 if (!lomac_subject_dominate(subj, obj))
1908 return (EACCES);
1909
1910 return (0);
1911 }
1912
1913 static void
1914 lomac_proc_destroy_label(struct label *label)
1915 {
1916
1917 mtx_destroy(&PSLOT(label)->mtx);
1918 free(PSLOT(label), M_LOMAC);
1919 PSLOT_SET(label, NULL);
1920 }
1921
1922 static void
1923 lomac_proc_init_label(struct label *label)
1924 {
1925
1926 PSLOT_SET(label, malloc(sizeof(struct mac_lomac_proc), M_LOMAC,
1927 M_ZERO | M_WAITOK));
1928 mtx_init(&PSLOT(label)->mtx, "MAC/Lomac proc lock", NULL, MTX_DEF);
1929 }
1930
1931 static int
1932 lomac_socket_check_deliver(struct socket *so, struct label *solabel,
1933 struct mbuf *m, struct label *mlabel)
1934 {
1935 struct mac_lomac *p, *s;
1936 int error;
1937
1938 if (!lomac_enabled)
1939 return (0);
1940
1941 p = SLOT(mlabel);
1942 s = SLOT(solabel);
1943
1944 SOCK_LOCK(so);
1945 error = lomac_equal_single(p, s) ? 0 : EACCES;
1946 SOCK_UNLOCK(so);
1947 return (error);
1948 }
1949
1950 static int
1951 lomac_socket_check_relabel(struct ucred *cred, struct socket *so,
1952 struct label *solabel, struct label *newlabel)
1953 {
1954 struct mac_lomac *subj, *obj, *new;
1955 int error;
1956
1957 SOCK_LOCK_ASSERT(so);
1958
1959 new = SLOT(newlabel);
1960 subj = SLOT(cred->cr_label);
1961 obj = SLOT(solabel);
1962
1963 /*
1964 * If there is a LOMAC label update for the socket, it may be an
1965 * update of single.
1966 */
1967 error = lomac_atmostflags(new, MAC_LOMAC_FLAG_SINGLE);
1968 if (error)
1969 return (error);
1970
1971 /*
1972 * To relabel a socket, the old socket single must be in the subject
1973 * range.
1974 */
1975 if (!lomac_single_in_range(obj, subj))
1976 return (EPERM);
1977
1978 /*
1979 * If the LOMAC label is to be changed, authorize as appropriate.
1980 */
1981 if (new->ml_flags & MAC_LOMAC_FLAG_SINGLE) {
1982 /*
1983 * To relabel a socket, the new socket single must be in the
1984 * subject range.
1985 */
1986 if (!lomac_single_in_range(new, subj))
1987 return (EPERM);
1988
1989 /*
1990 * To change the LOMAC label on the socket to contain EQUAL,
1991 * the subject must have appropriate privilege.
1992 */
1993 if (lomac_contains_equal(new)) {
1994 error = lomac_subject_privileged(subj);
1995 if (error)
1996 return (error);
1997 }
1998 }
1999
2000 return (0);
2001 }
2002
2003 static int
2004 lomac_socket_check_visible(struct ucred *cred, struct socket *so,
2005 struct label *solabel)
2006 {
2007 struct mac_lomac *subj, *obj;
2008
2009 if (!lomac_enabled)
2010 return (0);
2011
2012 subj = SLOT(cred->cr_label);
2013 obj = SLOT(solabel);
2014
2015 SOCK_LOCK(so);
2016 if (!lomac_dominate_single(obj, subj)) {
2017 SOCK_UNLOCK(so);
2018 return (ENOENT);
2019 }
2020 SOCK_UNLOCK(so);
2021
2022 return (0);
2023 }
2024
2025 static void
2026 lomac_socket_create(struct ucred *cred, struct socket *so,
2027 struct label *solabel)
2028 {
2029 struct mac_lomac *source, *dest;
2030
2031 source = SLOT(cred->cr_label);
2032 dest = SLOT(solabel);
2033
2034 lomac_copy_single(source, dest);
2035 }
2036
2037 static void
2038 lomac_socket_create_mbuf(struct socket *so, struct label *solabel,
2039 struct mbuf *m, struct label *mlabel)
2040 {
2041 struct mac_lomac *source, *dest;
2042
2043 source = SLOT(solabel);
2044 dest = SLOT(mlabel);
2045
2046 SOCK_LOCK(so);
2047 lomac_copy_single(source, dest);
2048 SOCK_UNLOCK(so);
2049 }
2050
2051 static void
2052 lomac_socket_newconn(struct socket *oldso, struct label *oldsolabel,
2053 struct socket *newso, struct label *newsolabel)
2054 {
2055 struct mac_lomac source, *dest;
2056
2057 SOCK_LOCK(oldso);
2058 source = *SLOT(oldsolabel);
2059 SOCK_UNLOCK(oldso);
2060
2061 dest = SLOT(newsolabel);
2062
2063 SOCK_LOCK(newso);
2064 lomac_copy_single(&source, dest);
2065 SOCK_UNLOCK(newso);
2066 }
2067
2068 static void
2069 lomac_socket_relabel(struct ucred *cred, struct socket *so,
2070 struct label *solabel, struct label *newlabel)
2071 {
2072 struct mac_lomac *source, *dest;
2073
2074 SOCK_LOCK_ASSERT(so);
2075
2076 source = SLOT(newlabel);
2077 dest = SLOT(solabel);
2078
2079 try_relabel(source, dest);
2080 }
2081
2082 static void
2083 lomac_socketpeer_set_from_mbuf(struct mbuf *m, struct label *mlabel,
2084 struct socket *so, struct label *sopeerlabel)
2085 {
2086 struct mac_lomac *source, *dest;
2087
2088 source = SLOT(mlabel);
2089 dest = SLOT(sopeerlabel);
2090
2091 SOCK_LOCK(so);
2092 lomac_copy_single(source, dest);
2093 SOCK_UNLOCK(so);
2094 }
2095
2096 static void
2097 lomac_socketpeer_set_from_socket(struct socket *oldso,
2098 struct label *oldsolabel, struct socket *newso,
2099 struct label *newsopeerlabel)
2100 {
2101 struct mac_lomac source, *dest;
2102
2103 SOCK_LOCK(oldso);
2104 source = *SLOT(oldsolabel);
2105 SOCK_UNLOCK(oldso);
2106
2107 dest = SLOT(newsopeerlabel);
2108
2109 SOCK_LOCK(newso);
2110 lomac_copy_single(&source, dest);
2111 SOCK_UNLOCK(newso);
2112 }
2113
2114 static void
2115 lomac_syncache_create(struct label *label, struct inpcb *inp)
2116 {
2117 struct mac_lomac *source, *dest;
2118
2119 source = SLOT(inp->inp_label);
2120 dest = SLOT(label);
2121 lomac_copy(source, dest);
2122 }
2123
2124 static void
2125 lomac_syncache_create_mbuf(struct label *sc_label, struct mbuf *m,
2126 struct label *mlabel)
2127 {
2128 struct mac_lomac *source, *dest;
2129
2130 source = SLOT(sc_label);
2131 dest = SLOT(mlabel);
2132 lomac_copy(source, dest);
2133 }
2134
2135 static int
2136 lomac_system_check_acct(struct ucred *cred, struct vnode *vp,
2137 struct label *vplabel)
2138 {
2139 struct mac_lomac *subj, *obj;
2140
2141 if (!lomac_enabled)
2142 return (0);
2143
2144 subj = SLOT(cred->cr_label);
2145 obj = SLOT(vplabel);
2146
2147 if (lomac_subject_privileged(subj))
2148 return (EPERM);
2149
2150 if (!lomac_high_single(obj))
2151 return (EACCES);
2152
2153 return (0);
2154 }
2155
2156 static int
2157 lomac_system_check_auditctl(struct ucred *cred, struct vnode *vp,
2158 struct label *vplabel)
2159 {
2160 struct mac_lomac *subj, *obj;
2161
2162 if (!lomac_enabled)
2163 return (0);
2164
2165 subj = SLOT(cred->cr_label);
2166 obj = SLOT(vplabel);
2167
2168 if (lomac_subject_privileged(subj))
2169 return (EPERM);
2170
2171 if (!lomac_high_single(obj))
2172 return (EACCES);
2173
2174 return (0);
2175 }
2176
2177 static int
2178 lomac_system_check_swapoff(struct ucred *cred, struct vnode *vp,
2179 struct label *vplabel)
2180 {
2181 struct mac_lomac *subj;
2182
2183 if (!lomac_enabled)
2184 return (0);
2185
2186 subj = SLOT(cred->cr_label);
2187
2188 if (lomac_subject_privileged(subj))
2189 return (EPERM);
2190
2191 return (0);
2192 }
2193
2194 static int
2195 lomac_system_check_swapon(struct ucred *cred, struct vnode *vp,
2196 struct label *vplabel)
2197 {
2198 struct mac_lomac *subj, *obj;
2199
2200 if (!lomac_enabled)
2201 return (0);
2202
2203 subj = SLOT(cred->cr_label);
2204 obj = SLOT(vplabel);
2205
2206 if (lomac_subject_privileged(subj))
2207 return (EPERM);
2208
2209 if (!lomac_high_single(obj))
2210 return (EACCES);
2211
2212 return (0);
2213 }
2214
2215 static int
2216 lomac_system_check_sysctl(struct ucred *cred, struct sysctl_oid *oidp,
2217 void *arg1, int arg2, struct sysctl_req *req)
2218 {
2219 struct mac_lomac *subj;
2220
2221 if (!lomac_enabled)
2222 return (0);
2223
2224 subj = SLOT(cred->cr_label);
2225
2226 /*
2227 * Treat sysctl variables without CTLFLAG_ANYBODY flag as lomac/high,
2228 * but also require privilege to change them.
2229 */
2230 if (req->newptr != NULL && (oidp->oid_kind & CTLFLAG_ANYBODY) == 0) {
2231 #ifdef notdef
2232 if (!lomac_subject_dominate_high(subj))
2233 return (EACCES);
2234 #endif
2235
2236 if (lomac_subject_privileged(subj))
2237 return (EPERM);
2238 }
2239
2240 return (0);
2241 }
2242
2243 static void
2244 lomac_thread_userret(struct thread *td)
2245 {
2246 struct proc *p = td->td_proc;
2247 struct mac_lomac_proc *subj = PSLOT(p->p_label);
2248 struct ucred *newcred, *oldcred;
2249 int dodrop;
2250
2251 mtx_lock(&subj->mtx);
2252 if (subj->mac_lomac.ml_flags & MAC_LOMAC_FLAG_UPDATE) {
2253 dodrop = 0;
2254 mtx_unlock(&subj->mtx);
2255 newcred = crget();
2256 /*
2257 * Prevent a lock order reversal in mac_proc_vm_revoke;
2258 * ideally, the other user of subj->mtx wouldn't be holding
2259 * Giant.
2260 */
2261 mtx_lock(&Giant);
2262 PROC_LOCK(p);
2263 mtx_lock(&subj->mtx);
2264 /*
2265 * Check if we lost the race while allocating the cred.
2266 */
2267 if ((subj->mac_lomac.ml_flags & MAC_LOMAC_FLAG_UPDATE) == 0) {
2268 crfree(newcred);
2269 goto out;
2270 }
2271 oldcred = p->p_ucred;
2272 crcopy(newcred, oldcred);
2273 crhold(newcred);
2274 lomac_copy(&subj->mac_lomac, SLOT(newcred->cr_label));
2275 p->p_ucred = newcred;
2276 crfree(oldcred);
2277 dodrop = 1;
2278 out:
2279 mtx_unlock(&subj->mtx);
2280 PROC_UNLOCK(p);
2281 if (dodrop)
2282 mac_proc_vm_revoke(curthread);
2283 mtx_unlock(&Giant);
2284 } else {
2285 mtx_unlock(&subj->mtx);
2286 }
2287 }
2288
2289 static int
2290 lomac_vnode_associate_extattr(struct mount *mp, struct label *mplabel,
2291 struct vnode *vp, struct label *vplabel)
2292 {
2293 struct mac_lomac ml_temp, *source, *dest;
2294 int buflen, error;
2295
2296 source = SLOT(mplabel);
2297 dest = SLOT(vplabel);
2298
2299 buflen = sizeof(ml_temp);
2300 bzero(&ml_temp, buflen);
2301
2302 error = vn_extattr_get(vp, IO_NODELOCKED, MAC_LOMAC_EXTATTR_NAMESPACE,
2303 MAC_LOMAC_EXTATTR_NAME, &buflen, (char *)&ml_temp, curthread);
2304 if (error == ENOATTR || error == EOPNOTSUPP) {
2305 /* Fall back to the mntlabel. */
2306 lomac_copy_single(source, dest);
2307 return (0);
2308 } else if (error)
2309 return (error);
2310
2311 if (buflen != sizeof(ml_temp)) {
2312 if (buflen != sizeof(ml_temp) - sizeof(ml_temp.ml_auxsingle)) {
2313 printf("lomac_vnode_associate_extattr: bad size %d\n",
2314 buflen);
2315 return (EPERM);
2316 }
2317 bzero(&ml_temp.ml_auxsingle, sizeof(ml_temp.ml_auxsingle));
2318 buflen = sizeof(ml_temp);
2319 (void)vn_extattr_set(vp, IO_NODELOCKED,
2320 MAC_LOMAC_EXTATTR_NAMESPACE, MAC_LOMAC_EXTATTR_NAME,
2321 buflen, (char *)&ml_temp, curthread);
2322 }
2323 if (lomac_valid(&ml_temp) != 0) {
2324 printf("lomac_vnode_associate_extattr: invalid\n");
2325 return (EPERM);
2326 }
2327 if ((ml_temp.ml_flags & MAC_LOMAC_FLAGS_BOTH) !=
2328 MAC_LOMAC_FLAG_SINGLE) {
2329 printf("lomac_vnode_associate_extattr: not single\n");
2330 return (EPERM);
2331 }
2332
2333 lomac_copy_single(&ml_temp, dest);
2334 return (0);
2335 }
2336
2337 static void
2338 lomac_vnode_associate_singlelabel(struct mount *mp, struct label *mplabel,
2339 struct vnode *vp, struct label *vplabel)
2340 {
2341 struct mac_lomac *source, *dest;
2342
2343 source = SLOT(mplabel);
2344 dest = SLOT(vplabel);
2345
2346 lomac_copy_single(source, dest);
2347 }
2348
2349 static int
2350 lomac_vnode_check_create(struct ucred *cred, struct vnode *dvp,
2351 struct label *dvplabel, struct componentname *cnp, struct vattr *vap)
2352 {
2353 struct mac_lomac *subj, *obj;
2354
2355 if (!lomac_enabled)
2356 return (0);
2357
2358 subj = SLOT(cred->cr_label);
2359 obj = SLOT(dvplabel);
2360
2361 if (!lomac_subject_dominate(subj, obj))
2362 return (EACCES);
2363 if (obj->ml_flags & MAC_LOMAC_FLAG_AUX &&
2364 !lomac_dominate_element(&subj->ml_single, &obj->ml_auxsingle))
2365 return (EACCES);
2366
2367 return (0);
2368 }
2369
2370 static int
2371 lomac_vnode_check_deleteacl(struct ucred *cred, struct vnode *vp,
2372 struct label *vplabel, acl_type_t type)
2373 {
2374 struct mac_lomac *subj, *obj;
2375
2376 if (!lomac_enabled)
2377 return (0);
2378
2379 subj = SLOT(cred->cr_label);
2380 obj = SLOT(vplabel);
2381
2382 if (!lomac_subject_dominate(subj, obj))
2383 return (EACCES);
2384
2385 return (0);
2386 }
2387
2388 static int
2389 lomac_vnode_check_link(struct ucred *cred, struct vnode *dvp,
2390 struct label *dvplabel, struct vnode *vp, struct label *vplabel,
2391 struct componentname *cnp)
2392 {
2393 struct mac_lomac *subj, *obj;
2394
2395 if (!lomac_enabled)
2396 return (0);
2397
2398 subj = SLOT(cred->cr_label);
2399 obj = SLOT(dvplabel);
2400
2401 if (!lomac_subject_dominate(subj, obj))
2402 return (EACCES);
2403
2404 obj = SLOT(vplabel);
2405
2406 if (!lomac_subject_dominate(subj, obj))
2407 return (EACCES);
2408
2409 return (0);
2410 }
2411
2412 static int
2413 lomac_vnode_check_mmap(struct ucred *cred, struct vnode *vp,
2414 struct label *vplabel, int prot, int flags)
2415 {
2416 struct mac_lomac *subj, *obj;
2417
2418 /*
2419 * Rely on the use of open()-time protections to handle
2420 * non-revocation cases.
2421 */
2422 if (!lomac_enabled)
2423 return (0);
2424
2425 subj = SLOT(cred->cr_label);
2426 obj = SLOT(vplabel);
2427
2428 if (((prot & VM_PROT_WRITE) != 0) && ((flags & MAP_SHARED) != 0)) {
2429 if (!lomac_subject_dominate(subj, obj))
2430 return (EACCES);
2431 }
2432 if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) {
2433 if (!lomac_dominate_single(obj, subj))
2434 return (maybe_demote(subj, obj, "mapping", "file", vp));
2435 }
2436
2437 return (0);
2438 }
2439
2440 static void
2441 lomac_vnode_check_mmap_downgrade(struct ucred *cred, struct vnode *vp,
2442 struct label *vplabel, /* XXX vm_prot_t */ int *prot)
2443 {
2444 struct mac_lomac *subj, *obj;
2445
2446 /*
2447 * Rely on the use of open()-time protections to handle
2448 * non-revocation cases.
2449 */
2450 if (!lomac_enabled || !revocation_enabled)
2451 return;
2452
2453 subj = SLOT(cred->cr_label);
2454 obj = SLOT(vplabel);
2455
2456 if (!lomac_subject_dominate(subj, obj))
2457 *prot &= ~VM_PROT_WRITE;
2458 }
2459
2460 static int
2461 lomac_vnode_check_open(struct ucred *cred, struct vnode *vp,
2462 struct label *vplabel, accmode_t accmode)
2463 {
2464 struct mac_lomac *subj, *obj;
2465
2466 if (!lomac_enabled)
2467 return (0);
2468
2469 subj = SLOT(cred->cr_label);
2470 obj = SLOT(vplabel);
2471
2472 /* XXX privilege override for admin? */
2473 if (accmode & (VWRITE | VAPPEND | VADMIN)) {
2474 if (!lomac_subject_dominate(subj, obj))
2475 return (EACCES);
2476 }
2477
2478 return (0);
2479 }
2480
2481 static int
2482 lomac_vnode_check_read(struct ucred *active_cred, struct ucred *file_cred,
2483 struct vnode *vp, struct label *vplabel)
2484 {
2485 struct mac_lomac *subj, *obj;
2486
2487 if (!lomac_enabled || !revocation_enabled)
2488 return (0);
2489
2490 subj = SLOT(active_cred->cr_label);
2491 obj = SLOT(vplabel);
2492
2493 if (!lomac_dominate_single(obj, subj))
2494 return (maybe_demote(subj, obj, "reading", "file", vp));
2495
2496 return (0);
2497 }
2498
2499 static int
2500 lomac_vnode_check_relabel(struct ucred *cred, struct vnode *vp,
2501 struct label *vplabel, struct label *newlabel)
2502 {
2503 struct mac_lomac *old, *new, *subj;
2504 int error;
2505
2506 old = SLOT(vplabel);
2507 new = SLOT(newlabel);
2508 subj = SLOT(cred->cr_label);
2509
2510 /*
2511 * If there is a LOMAC label update for the vnode, it must be a
2512 * single label, with an optional explicit auxiliary single.
2513 */
2514 error = lomac_atmostflags(new,
2515 MAC_LOMAC_FLAG_SINGLE | MAC_LOMAC_FLAG_AUX);
2516 if (error)
2517 return (error);
2518
2519 /*
2520 * To perform a relabel of the vnode (LOMAC label or not), LOMAC must
2521 * authorize the relabel.
2522 */
2523 if (!lomac_single_in_range(old, subj))
2524 return (EPERM);
2525
2526 /*
2527 * If the LOMAC label is to be changed, authorize as appropriate.
2528 */
2529 if (new->ml_flags & MAC_LOMAC_FLAG_SINGLE) {
2530 /*
2531 * To change the LOMAC label on a vnode, the new vnode label
2532 * must be in the subject range.
2533 */
2534 if (!lomac_single_in_range(new, subj))
2535 return (EPERM);
2536
2537 /*
2538 * To change the LOMAC label on the vnode to be EQUAL, the
2539 * subject must have appropriate privilege.
2540 */
2541 if (lomac_contains_equal(new)) {
2542 error = lomac_subject_privileged(subj);
2543 if (error)
2544 return (error);
2545 }
2546 }
2547 if (new->ml_flags & MAC_LOMAC_FLAG_AUX) {
2548 /*
2549 * Fill in the missing parts from the previous label.
2550 */
2551 if ((new->ml_flags & MAC_LOMAC_FLAG_SINGLE) == 0)
2552 lomac_copy_single(subj, new);
2553
2554 /*
2555 * To change the auxiliary LOMAC label on a vnode, the new
2556 * vnode label must be in the subject range.
2557 */
2558 if (!lomac_auxsingle_in_range(new, subj))
2559 return (EPERM);
2560
2561 /*
2562 * To change the auxiliary LOMAC label on the vnode to be
2563 * EQUAL, the subject must have appropriate privilege.
2564 */
2565 if (lomac_contains_equal(new)) {
2566 error = lomac_subject_privileged(subj);
2567 if (error)
2568 return (error);
2569 }
2570 }
2571
2572 return (0);
2573 }
2574
2575 static int
2576 lomac_vnode_check_rename_from(struct ucred *cred, struct vnode *dvp,
2577 struct label *dvplabel, struct vnode *vp, struct label *vplabel,
2578 struct componentname *cnp)
2579 {
2580 struct mac_lomac *subj, *obj;
2581
2582 if (!lomac_enabled)
2583 return (0);
2584
2585 subj = SLOT(cred->cr_label);
2586 obj = SLOT(dvplabel);
2587
2588 if (!lomac_subject_dominate(subj, obj))
2589 return (EACCES);
2590
2591 obj = SLOT(vplabel);
2592
2593 if (!lomac_subject_dominate(subj, obj))
2594 return (EACCES);
2595
2596 return (0);
2597 }
2598
2599 static int
2600 lomac_vnode_check_rename_to(struct ucred *cred, struct vnode *dvp,
2601 struct label *dvplabel, struct vnode *vp, struct label *vplabel,
2602 int samedir, struct componentname *cnp)
2603 {
2604 struct mac_lomac *subj, *obj;
2605
2606 if (!lomac_enabled)
2607 return (0);
2608
2609 subj = SLOT(cred->cr_label);
2610 obj = SLOT(dvplabel);
2611
2612 if (!lomac_subject_dominate(subj, obj))
2613 return (EACCES);
2614
2615 if (vp != NULL) {
2616 obj = SLOT(vplabel);
2617
2618 if (!lomac_subject_dominate(subj, obj))
2619 return (EACCES);
2620 }
2621
2622 return (0);
2623 }
2624
2625 static int
2626 lomac_vnode_check_revoke(struct ucred *cred, struct vnode *vp,
2627 struct label *vplabel)
2628 {
2629 struct mac_lomac *subj, *obj;
2630
2631 if (!lomac_enabled)
2632 return (0);
2633
2634 subj = SLOT(cred->cr_label);
2635 obj = SLOT(vplabel);
2636
2637 if (!lomac_subject_dominate(subj, obj))
2638 return (EACCES);
2639
2640 return (0);
2641 }
2642
2643 static int
2644 lomac_vnode_check_setacl(struct ucred *cred, struct vnode *vp,
2645 struct label *vplabel, acl_type_t type, struct acl *acl)
2646 {
2647 struct mac_lomac *subj, *obj;
2648
2649 if (!lomac_enabled)
2650 return (0);
2651
2652 subj = SLOT(cred->cr_label);
2653 obj = SLOT(vplabel);
2654
2655 if (!lomac_subject_dominate(subj, obj))
2656 return (EACCES);
2657
2658 return (0);
2659 }
2660
2661 static int
2662 lomac_vnode_check_setextattr(struct ucred *cred, struct vnode *vp,
2663 struct label *vplabel, int attrnamespace, const char *name)
2664 {
2665 struct mac_lomac *subj, *obj;
2666
2667 if (!lomac_enabled)
2668 return (0);
2669
2670 subj = SLOT(cred->cr_label);
2671 obj = SLOT(vplabel);
2672
2673 if (!lomac_subject_dominate(subj, obj))
2674 return (EACCES);
2675
2676 /* XXX: protect the MAC EA in a special way? */
2677
2678 return (0);
2679 }
2680
2681 static int
2682 lomac_vnode_check_setflags(struct ucred *cred, struct vnode *vp,
2683 struct label *vplabel, u_long flags)
2684 {
2685 struct mac_lomac *subj, *obj;
2686
2687 if (!lomac_enabled)
2688 return (0);
2689
2690 subj = SLOT(cred->cr_label);
2691 obj = SLOT(vplabel);
2692
2693 if (!lomac_subject_dominate(subj, obj))
2694 return (EACCES);
2695
2696 return (0);
2697 }
2698
2699 static int
2700 lomac_vnode_check_setmode(struct ucred *cred, struct vnode *vp,
2701 struct label *vplabel, mode_t mode)
2702 {
2703 struct mac_lomac *subj, *obj;
2704
2705 if (!lomac_enabled)
2706 return (0);
2707
2708 subj = SLOT(cred->cr_label);
2709 obj = SLOT(vplabel);
2710
2711 if (!lomac_subject_dominate(subj, obj))
2712 return (EACCES);
2713
2714 return (0);
2715 }
2716
2717 static int
2718 lomac_vnode_check_setowner(struct ucred *cred, struct vnode *vp,
2719 struct label *vplabel, uid_t uid, gid_t gid)
2720 {
2721 struct mac_lomac *subj, *obj;
2722
2723 if (!lomac_enabled)
2724 return (0);
2725
2726 subj = SLOT(cred->cr_label);
2727 obj = SLOT(vplabel);
2728
2729 if (!lomac_subject_dominate(subj, obj))
2730 return (EACCES);
2731
2732 return (0);
2733 }
2734
2735 static int
2736 lomac_vnode_check_setutimes(struct ucred *cred, struct vnode *vp,
2737 struct label *vplabel, struct timespec atime, struct timespec mtime)
2738 {
2739 struct mac_lomac *subj, *obj;
2740
2741 if (!lomac_enabled)
2742 return (0);
2743
2744 subj = SLOT(cred->cr_label);
2745 obj = SLOT(vplabel);
2746
2747 if (!lomac_subject_dominate(subj, obj))
2748 return (EACCES);
2749
2750 return (0);
2751 }
2752
2753 static int
2754 lomac_vnode_check_unlink(struct ucred *cred, struct vnode *dvp,
2755 struct label *dvplabel, struct vnode *vp, struct label *vplabel,
2756 struct componentname *cnp)
2757 {
2758 struct mac_lomac *subj, *obj;
2759
2760 if (!lomac_enabled)
2761 return (0);
2762
2763 subj = SLOT(cred->cr_label);
2764 obj = SLOT(dvplabel);
2765
2766 if (!lomac_subject_dominate(subj, obj))
2767 return (EACCES);
2768
2769 obj = SLOT(vplabel);
2770
2771 if (!lomac_subject_dominate(subj, obj))
2772 return (EACCES);
2773
2774 return (0);
2775 }
2776
2777 static int
2778 lomac_vnode_check_write(struct ucred *active_cred,
2779 struct ucred *file_cred, struct vnode *vp, struct label *vplabel)
2780 {
2781 struct mac_lomac *subj, *obj;
2782
2783 if (!lomac_enabled || !revocation_enabled)
2784 return (0);
2785
2786 subj = SLOT(active_cred->cr_label);
2787 obj = SLOT(vplabel);
2788
2789 if (!lomac_subject_dominate(subj, obj))
2790 return (EACCES);
2791
2792 return (0);
2793 }
2794
2795 static int
2796 lomac_vnode_create_extattr(struct ucred *cred, struct mount *mp,
2797 struct label *mplabel, struct vnode *dvp, struct label *dvplabel,
2798 struct vnode *vp, struct label *vplabel, struct componentname *cnp)
2799 {
2800 struct mac_lomac *source, *dest, *dir, temp;
2801 size_t buflen;
2802 int error;
2803
2804 buflen = sizeof(temp);
2805 bzero(&temp, buflen);
2806
2807 source = SLOT(cred->cr_label);
2808 dest = SLOT(vplabel);
2809 dir = SLOT(dvplabel);
2810 if (dir->ml_flags & MAC_LOMAC_FLAG_AUX) {
2811 lomac_copy_auxsingle(dir, &temp);
2812 lomac_set_single(&temp, dir->ml_auxsingle.mle_type,
2813 dir->ml_auxsingle.mle_grade);
2814 } else {
2815 lomac_copy_single(source, &temp);
2816 }
2817
2818 error = vn_extattr_set(vp, IO_NODELOCKED, MAC_LOMAC_EXTATTR_NAMESPACE,
2819 MAC_LOMAC_EXTATTR_NAME, buflen, (char *)&temp, curthread);
2820 if (error == 0)
2821 lomac_copy(&temp, dest);
2822 return (error);
2823 }
2824
2825 static void
2826 lomac_vnode_execve_transition(struct ucred *old, struct ucred *new,
2827 struct vnode *vp, struct label *vplabel, struct label *interpvplabel,
2828 struct image_params *imgp, struct label *execlabel)
2829 {
2830 struct mac_lomac *source, *dest, *obj, *robj;
2831
2832 source = SLOT(old->cr_label);
2833 dest = SLOT(new->cr_label);
2834 obj = SLOT(vplabel);
2835 robj = interpvplabel != NULL ? SLOT(interpvplabel) : obj;
2836
2837 lomac_copy(source, dest);
2838 /*
2839 * If there's an auxiliary label on the real object, respect it and
2840 * assume that this level should be assumed immediately if a higher
2841 * level is currently in place.
2842 */
2843 if (robj->ml_flags & MAC_LOMAC_FLAG_AUX &&
2844 !lomac_dominate_element(&robj->ml_auxsingle, &dest->ml_single)
2845 && lomac_auxsingle_in_range(robj, dest))
2846 lomac_set_single(dest, robj->ml_auxsingle.mle_type,
2847 robj->ml_auxsingle.mle_grade);
2848 /*
2849 * Restructuring to use the execve transitioning mechanism instead of
2850 * the normal demotion mechanism here would be difficult, so just
2851 * copy the label over and perform standard demotion. This is also
2852 * non-optimal because it will result in the intermediate label "new"
2853 * being created and immediately recycled.
2854 */
2855 if (lomac_enabled && revocation_enabled &&
2856 !lomac_dominate_single(obj, source))
2857 (void)maybe_demote(source, obj, "executing", "file", vp);
2858 }
2859
2860 static int
2861 lomac_vnode_execve_will_transition(struct ucred *old, struct vnode *vp,
2862 struct label *vplabel, struct label *interpvplabel,
2863 struct image_params *imgp, struct label *execlabel)
2864 {
2865 struct mac_lomac *subj, *obj, *robj;
2866
2867 if (!lomac_enabled || !revocation_enabled)
2868 return (0);
2869
2870 subj = SLOT(old->cr_label);
2871 obj = SLOT(vplabel);
2872 robj = interpvplabel != NULL ? SLOT(interpvplabel) : obj;
2873
2874 return ((robj->ml_flags & MAC_LOMAC_FLAG_AUX &&
2875 !lomac_dominate_element(&robj->ml_auxsingle, &subj->ml_single)
2876 && lomac_auxsingle_in_range(robj, subj)) ||
2877 !lomac_dominate_single(obj, subj));
2878 }
2879
2880 static void
2881 lomac_vnode_relabel(struct ucred *cred, struct vnode *vp,
2882 struct label *vplabel, struct label *newlabel)
2883 {
2884 struct mac_lomac *source, *dest;
2885
2886 source = SLOT(newlabel);
2887 dest = SLOT(vplabel);
2888
2889 try_relabel(source, dest);
2890 }
2891
2892 static int
2893 lomac_vnode_setlabel_extattr(struct ucred *cred, struct vnode *vp,
2894 struct label *vplabel, struct label *intlabel)
2895 {
2896 struct mac_lomac *source, temp;
2897 size_t buflen;
2898 int error;
2899
2900 buflen = sizeof(temp);
2901 bzero(&temp, buflen);
2902
2903 source = SLOT(intlabel);
2904 if ((source->ml_flags & MAC_LOMAC_FLAG_SINGLE) == 0)
2905 return (0);
2906
2907 lomac_copy_single(source, &temp);
2908 error = vn_extattr_set(vp, IO_NODELOCKED, MAC_LOMAC_EXTATTR_NAMESPACE,
2909 MAC_LOMAC_EXTATTR_NAME, buflen, (char *)&temp, curthread);
2910 return (error);
2911 }
2912
2913 static struct mac_policy_ops lomac_ops =
2914 {
2915 .mpo_init = lomac_init,
2916
2917 .mpo_bpfdesc_check_receive = lomac_bpfdesc_check_receive,
2918 .mpo_bpfdesc_create = lomac_bpfdesc_create,
2919 .mpo_bpfdesc_create_mbuf = lomac_bpfdesc_create_mbuf,
2920 .mpo_bpfdesc_destroy_label = lomac_destroy_label,
2921 .mpo_bpfdesc_init_label = lomac_init_label,
2922
2923 .mpo_cred_check_relabel = lomac_cred_check_relabel,
2924 .mpo_cred_check_visible = lomac_cred_check_visible,
2925 .mpo_cred_copy_label = lomac_copy_label,
2926 .mpo_cred_create_swapper = lomac_cred_create_swapper,
2927 .mpo_cred_create_init = lomac_cred_create_init,
2928 .mpo_cred_destroy_label = lomac_destroy_label,
2929 .mpo_cred_externalize_label = lomac_externalize_label,
2930 .mpo_cred_init_label = lomac_init_label,
2931 .mpo_cred_internalize_label = lomac_internalize_label,
2932 .mpo_cred_relabel = lomac_cred_relabel,
2933
2934 .mpo_devfs_create_device = lomac_devfs_create_device,
2935 .mpo_devfs_create_directory = lomac_devfs_create_directory,
2936 .mpo_devfs_create_symlink = lomac_devfs_create_symlink,
2937 .mpo_devfs_destroy_label = lomac_destroy_label,
2938 .mpo_devfs_init_label = lomac_init_label,
2939 .mpo_devfs_update = lomac_devfs_update,
2940 .mpo_devfs_vnode_associate = lomac_devfs_vnode_associate,
2941
2942 .mpo_ifnet_check_relabel = lomac_ifnet_check_relabel,
2943 .mpo_ifnet_check_transmit = lomac_ifnet_check_transmit,
2944 .mpo_ifnet_copy_label = lomac_copy_label,
2945 .mpo_ifnet_create = lomac_ifnet_create,
2946 .mpo_ifnet_create_mbuf = lomac_ifnet_create_mbuf,
2947 .mpo_ifnet_destroy_label = lomac_destroy_label,
2948 .mpo_ifnet_externalize_label = lomac_externalize_label,
2949 .mpo_ifnet_init_label = lomac_init_label,
2950 .mpo_ifnet_internalize_label = lomac_internalize_label,
2951 .mpo_ifnet_relabel = lomac_ifnet_relabel,
2952
2953 .mpo_syncache_create = lomac_syncache_create,
2954 .mpo_syncache_destroy_label = lomac_destroy_label,
2955 .mpo_syncache_init_label = lomac_init_label_waitcheck,
2956
2957 .mpo_inpcb_check_deliver = lomac_inpcb_check_deliver,
2958 .mpo_inpcb_check_visible = lomac_inpcb_check_visible,
2959 .mpo_inpcb_create = lomac_inpcb_create,
2960 .mpo_inpcb_create_mbuf = lomac_inpcb_create_mbuf,
2961 .mpo_inpcb_destroy_label = lomac_destroy_label,
2962 .mpo_inpcb_init_label = lomac_init_label_waitcheck,
2963 .mpo_inpcb_sosetlabel = lomac_inpcb_sosetlabel,
2964
2965 .mpo_ip6q_create = lomac_ip6q_create,
2966 .mpo_ip6q_destroy_label = lomac_destroy_label,
2967 .mpo_ip6q_init_label = lomac_init_label_waitcheck,
2968 .mpo_ip6q_match = lomac_ip6q_match,
2969 .mpo_ip6q_reassemble = lomac_ip6q_reassemble,
2970 .mpo_ip6q_update = lomac_ip6q_update,
2971
2972 .mpo_ipq_create = lomac_ipq_create,
2973 .mpo_ipq_destroy_label = lomac_destroy_label,
2974 .mpo_ipq_init_label = lomac_init_label_waitcheck,
2975 .mpo_ipq_match = lomac_ipq_match,
2976 .mpo_ipq_reassemble = lomac_ipq_reassemble,
2977 .mpo_ipq_update = lomac_ipq_update,
2978
2979 .mpo_kld_check_load = lomac_kld_check_load,
2980
2981 .mpo_mbuf_copy_label = lomac_copy_label,
2982 .mpo_mbuf_destroy_label = lomac_destroy_label,
2983 .mpo_mbuf_init_label = lomac_init_label_waitcheck,
2984
2985 .mpo_mount_create = lomac_mount_create,
2986 .mpo_mount_destroy_label = lomac_destroy_label,
2987 .mpo_mount_init_label = lomac_init_label,
2988
2989 .mpo_netatalk_aarp_send = lomac_netatalk_aarp_send,
2990
2991 .mpo_netinet_arp_send = lomac_netinet_arp_send,
2992 .mpo_netinet_firewall_reply = lomac_netinet_firewall_reply,
2993 .mpo_netinet_firewall_send = lomac_netinet_firewall_send,
2994 .mpo_netinet_fragment = lomac_netinet_fragment,
2995 .mpo_netinet_icmp_reply = lomac_netinet_icmp_reply,
2996 .mpo_netinet_igmp_send = lomac_netinet_igmp_send,
2997
2998 .mpo_netinet6_nd6_send = lomac_netinet6_nd6_send,
2999
3000 .mpo_pipe_check_ioctl = lomac_pipe_check_ioctl,
3001 .mpo_pipe_check_read = lomac_pipe_check_read,
3002 .mpo_pipe_check_relabel = lomac_pipe_check_relabel,
3003 .mpo_pipe_check_write = lomac_pipe_check_write,
3004 .mpo_pipe_copy_label = lomac_copy_label,
3005 .mpo_pipe_create = lomac_pipe_create,
3006 .mpo_pipe_destroy_label = lomac_destroy_label,
3007 .mpo_pipe_externalize_label = lomac_externalize_label,
3008 .mpo_pipe_init_label = lomac_init_label,
3009 .mpo_pipe_internalize_label = lomac_internalize_label,
3010 .mpo_pipe_relabel = lomac_pipe_relabel,
3011
3012 .mpo_priv_check = lomac_priv_check,
3013
3014 .mpo_proc_check_debug = lomac_proc_check_debug,
3015 .mpo_proc_check_sched = lomac_proc_check_sched,
3016 .mpo_proc_check_signal = lomac_proc_check_signal,
3017 .mpo_proc_destroy_label = lomac_proc_destroy_label,
3018 .mpo_proc_init_label = lomac_proc_init_label,
3019
3020 .mpo_socket_check_deliver = lomac_socket_check_deliver,
3021 .mpo_socket_check_relabel = lomac_socket_check_relabel,
3022 .mpo_socket_check_visible = lomac_socket_check_visible,
3023 .mpo_socket_copy_label = lomac_copy_label,
3024 .mpo_socket_create = lomac_socket_create,
3025 .mpo_socket_create_mbuf = lomac_socket_create_mbuf,
3026 .mpo_socket_destroy_label = lomac_destroy_label,
3027 .mpo_socket_externalize_label = lomac_externalize_label,
3028 .mpo_socket_init_label = lomac_init_label_waitcheck,
3029 .mpo_socket_internalize_label = lomac_internalize_label,
3030 .mpo_socket_newconn = lomac_socket_newconn,
3031 .mpo_socket_relabel = lomac_socket_relabel,
3032
3033 .mpo_socketpeer_destroy_label = lomac_destroy_label,
3034 .mpo_socketpeer_externalize_label = lomac_externalize_label,
3035 .mpo_socketpeer_init_label = lomac_init_label_waitcheck,
3036 .mpo_socketpeer_set_from_mbuf = lomac_socketpeer_set_from_mbuf,
3037 .mpo_socketpeer_set_from_socket = lomac_socketpeer_set_from_socket,
3038
3039 .mpo_syncache_create_mbuf = lomac_syncache_create_mbuf,
3040
3041 .mpo_system_check_acct = lomac_system_check_acct,
3042 .mpo_system_check_auditctl = lomac_system_check_auditctl,
3043 .mpo_system_check_swapoff = lomac_system_check_swapoff,
3044 .mpo_system_check_swapon = lomac_system_check_swapon,
3045 .mpo_system_check_sysctl = lomac_system_check_sysctl,
3046
3047 .mpo_thread_userret = lomac_thread_userret,
3048
3049 .mpo_vnode_associate_extattr = lomac_vnode_associate_extattr,
3050 .mpo_vnode_associate_singlelabel = lomac_vnode_associate_singlelabel,
3051 .mpo_vnode_check_access = lomac_vnode_check_open,
3052 .mpo_vnode_check_create = lomac_vnode_check_create,
3053 .mpo_vnode_check_deleteacl = lomac_vnode_check_deleteacl,
3054 .mpo_vnode_check_link = lomac_vnode_check_link,
3055 .mpo_vnode_check_mmap = lomac_vnode_check_mmap,
3056 .mpo_vnode_check_mmap_downgrade = lomac_vnode_check_mmap_downgrade,
3057 .mpo_vnode_check_open = lomac_vnode_check_open,
3058 .mpo_vnode_check_read = lomac_vnode_check_read,
3059 .mpo_vnode_check_relabel = lomac_vnode_check_relabel,
3060 .mpo_vnode_check_rename_from = lomac_vnode_check_rename_from,
3061 .mpo_vnode_check_rename_to = lomac_vnode_check_rename_to,
3062 .mpo_vnode_check_revoke = lomac_vnode_check_revoke,
3063 .mpo_vnode_check_setacl = lomac_vnode_check_setacl,
3064 .mpo_vnode_check_setextattr = lomac_vnode_check_setextattr,
3065 .mpo_vnode_check_setflags = lomac_vnode_check_setflags,
3066 .mpo_vnode_check_setmode = lomac_vnode_check_setmode,
3067 .mpo_vnode_check_setowner = lomac_vnode_check_setowner,
3068 .mpo_vnode_check_setutimes = lomac_vnode_check_setutimes,
3069 .mpo_vnode_check_unlink = lomac_vnode_check_unlink,
3070 .mpo_vnode_check_write = lomac_vnode_check_write,
3071 .mpo_vnode_copy_label = lomac_copy_label,
3072 .mpo_vnode_create_extattr = lomac_vnode_create_extattr,
3073 .mpo_vnode_destroy_label = lomac_destroy_label,
3074 .mpo_vnode_execve_transition = lomac_vnode_execve_transition,
3075 .mpo_vnode_execve_will_transition = lomac_vnode_execve_will_transition,
3076 .mpo_vnode_externalize_label = lomac_externalize_label,
3077 .mpo_vnode_init_label = lomac_init_label,
3078 .mpo_vnode_internalize_label = lomac_internalize_label,
3079 .mpo_vnode_relabel = lomac_vnode_relabel,
3080 .mpo_vnode_setlabel_extattr = lomac_vnode_setlabel_extattr,
3081 };
3082
3083 MAC_POLICY_SET(&lomac_ops, mac_lomac, "TrustedBSD MAC/LOMAC",
3084 MPC_LOADTIME_FLAG_NOTLATE, &lomac_slot);
Cache object: 89654b8302592390af92a1de5839c4a4
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