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
89struct mac_lomac_proc {
90 struct mac_lomac mac_lomac;
91 struct mtx mtx;
92};
93
94SYSCTL_DECL(_security_mac);
95
96SYSCTL_NODE(_security_mac, OID_AUTO, lomac, CTLFLAG_RW, 0,
97 "TrustedBSD mac_lomac policy controls");
98
99static int lomac_label_size = sizeof(struct mac_lomac);
100SYSCTL_INT(_security_mac_lomac, OID_AUTO, label_size, CTLFLAG_RD,
101 &lomac_label_size, 0, "Size of struct mac_lomac");
102
103static int lomac_enabled = 1;
104SYSCTL_INT(_security_mac_lomac, OID_AUTO, enabled, CTLFLAG_RW,
105 &lomac_enabled, 0, "Enforce MAC/LOMAC policy");
106TUNABLE_INT("security.mac.lomac.enabled", &lomac_enabled);
107
108static int destroyed_not_inited;
109SYSCTL_INT(_security_mac_lomac, OID_AUTO, destroyed_not_inited, CTLFLAG_RD,
110 &destroyed_not_inited, 0, "Count of labels destroyed but not inited");
111
112static int trust_all_interfaces = 0;
113SYSCTL_INT(_security_mac_lomac, OID_AUTO, trust_all_interfaces, CTLFLAG_RD,
114 &trust_all_interfaces, 0, "Consider all interfaces 'trusted' by MAC/LOMAC");
115TUNABLE_INT("security.mac.lomac.trust_all_interfaces", &trust_all_interfaces);
116
117static char trusted_interfaces[128];
118SYSCTL_STRING(_security_mac_lomac, OID_AUTO, trusted_interfaces, CTLFLAG_RD,
119 trusted_interfaces, 0, "Interfaces considered 'trusted' by MAC/LOMAC");
120TUNABLE_STR("security.mac.lomac.trusted_interfaces", trusted_interfaces,
121 sizeof(trusted_interfaces));
122
123static int ptys_equal = 0;
124SYSCTL_INT(_security_mac_lomac, OID_AUTO, ptys_equal, CTLFLAG_RW,
125 &ptys_equal, 0, "Label pty devices as lomac/equal on create");
126TUNABLE_INT("security.mac.lomac.ptys_equal", &ptys_equal);
127
128static int revocation_enabled = 1;
129SYSCTL_INT(_security_mac_lomac, OID_AUTO, revocation_enabled, CTLFLAG_RW,
130 &revocation_enabled, 0, "Revoke access to objects on relabel");
131TUNABLE_INT("security.mac.lomac.revocation_enabled", &revocation_enabled);
132
133static 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
140MALLOC_DEFINE(M_LOMAC, "mac_lomac_label", "MAC/LOMAC labels");
141
142static struct mac_lomac *
143lomac_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
152static void
153lomac_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
162static int
163lomac_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
171static int
172lomac_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
216static int
217lomac_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
226static int
227lomac_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
240static int
241lomac_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
255static int
256lomac_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
266static int
267lomac_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
278static int
279lomac_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
289static int
290lomac_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
301static int
302lomac_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
322static int
323lomac_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
348static int
349lomac_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
358static int
359lomac_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
428static void
429lomac_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
440static void
441lomac_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
449static void
450lomac_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
461static void
462lomac_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
472static void
473lomac_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
483static void
484lomac_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
495static int lomac_to_string(struct sbuf *sb, struct mac_lomac *ml);
496
497static int
498maybe_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 */
592static void
593try_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 */
605static void
606lomac_init(struct mac_policy_conf *conf)
607{
608
609}
610
611/*
612 * Label operations.
613 */
614static void
615lomac_init_label(struct label *label)
616{
617
618 SLOT_SET(label, lomac_alloc(M_WAITOK));
619}
620
621static int
622lomac_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
632static void
633lomac_destroy_label(struct label *label)
634{
635
636 lomac_free(SLOT(label));
637 SLOT_SET(label, NULL);
638}
639
640static int
641lomac_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
663static int
664lomac_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
703static int
704lomac_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
719static int
720lomac_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 */
756static int
757lomac_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
842static int
843lomac_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
864static void
865lomac_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 */
875static int
876lomac_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
892static void
893lomac_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
904static void
905lomac_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
916static int
917lomac_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
979static int
980lomac_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
997static void
998lomac_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
1008static void
1009lomac_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
1019static void
1020lomac_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
1030static void
1031lomac_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
1053static void
1054lomac_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
1063static void
1064lomac_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
1076static void
1077lomac_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
1088static void
1089lomac_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
1101static int
1102lomac_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
1158static int
1159lomac_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
1173static void
1174lomac_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 }
1226set:
1227 lomac_set_single(dest, grade, 0);
1228 lomac_set_range(dest, grade, 0, grade, 0);
1229}
1230
1231static void
1232lomac_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
1243static void
1244lomac_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
1255static int
1256lomac_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
1270static int
1271lomac_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
1288static void
1289lomac_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
1300static void
1301lomac_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
1312static void
1313lomac_inpcb_sosetlabel(struct socket *so, struct label *solabel,
1314 struct inpcb *inp, struct label *inplabel)
1315{
1316 struct mac_lomac *source, *dest;
1317
1318 source = SLOT(solabel);
1319 dest = SLOT(inplabel);
1320
1321 lomac_copy_single(source, dest);
1322}
1323
1324static void
1325lomac_ip6q_create(struct mbuf *m, struct label *mlabel, struct ip6q *q6,
1326 struct label *q6label)
1327{
1328 struct mac_lomac *source, *dest;
1329
1330 source = SLOT(mlabel);
1331 dest = SLOT(q6label);
1332
1333 lomac_copy_single(source, dest);
1334}
1335
1336static int
1337lomac_ip6q_match(struct mbuf *m, struct label *mlabel, struct ip6q *q6,
1338 struct label *q6label)
1339{
1340 struct mac_lomac *a, *b;
1341
1342 a = SLOT(q6label);
1343 b = SLOT(mlabel);
1344
1345 return (lomac_equal_single(a, b));
1346}
1347
1348static void
1349lomac_ip6q_reassemble(struct ip6q *q6, struct label *q6label, struct mbuf *m,
1350 struct label *mlabel)
1351{
1352 struct mac_lomac *source, *dest;
1353
1354 source = SLOT(q6label);
1355 dest = SLOT(mlabel);
1356
1357 /* Just use the head, since we require them all to match. */
1358 lomac_copy_single(source, dest);
1359}
1360
1361static void
1362lomac_ip6q_update(struct mbuf *m, struct label *mlabel, struct ip6q *q6,
1363 struct label *q6label)
1364{
1365
1366 /* NOOP: we only accept matching labels, so no need to update */
1367}
1368
1369static void
1370lomac_ipq_create(struct mbuf *m, struct label *mlabel, struct ipq *q,
1371 struct label *qlabel)
1372{
1373 struct mac_lomac *source, *dest;
1374
1375 source = SLOT(mlabel);
1376 dest = SLOT(qlabel);
1377
1378 lomac_copy_single(source, dest);
1379}
1380
1381static int
1382lomac_ipq_match(struct mbuf *m, struct label *mlabel, struct ipq *q,
1383 struct label *qlabel)
1384{
1385 struct mac_lomac *a, *b;
1386
1387 a = SLOT(qlabel);
1388 b = SLOT(mlabel);
1389
1390 return (lomac_equal_single(a, b));
1391}
1392
1393static void
1394lomac_ipq_reassemble(struct ipq *q, struct label *qlabel, struct mbuf *m,
1395 struct label *mlabel)
1396{
1397 struct mac_lomac *source, *dest;
1398
1399 source = SLOT(qlabel);
1400 dest = SLOT(mlabel);
1401
1402 /* Just use the head, since we require them all to match. */
1403 lomac_copy_single(source, dest);
1404}
1405
1406static void
1407lomac_ipq_update(struct mbuf *m, struct label *mlabel, struct ipq *q,
1408 struct label *qlabel)
1409{
1410
1411 /* NOOP: we only accept matching labels, so no need to update */
1412}
1413
1414static int
1415lomac_kld_check_load(struct ucred *cred, struct vnode *vp,
1416 struct label *vplabel)
1417{
1418 struct mac_lomac *subj, *obj;
1419
1420 if (!lomac_enabled)
1421 return (0);
1422
1423 subj = SLOT(cred->cr_label);
1424 obj = SLOT(vplabel);
1425
1426 if (lomac_subject_privileged(subj))
1427 return (EPERM);
1428
1429 if (!lomac_high_single(obj))
1430 return (EACCES);
1431
1432 return (0);
1433}
1434
1435static void
1436lomac_mount_create(struct ucred *cred, struct mount *mp,
1437 struct label *mplabel)
1438{
1439 struct mac_lomac *source, *dest;
1440
1441 source = SLOT(cred->cr_label);
1442 dest = SLOT(mplabel);
1443 lomac_copy_single(source, dest);
1444}
1445
1446static void
1447lomac_netatalk_aarp_send(struct ifnet *ifp, struct label *ifplabel,
1448 struct mbuf *m, struct label *mlabel)
1449{
1450 struct mac_lomac *dest;
1451
1452 dest = SLOT(mlabel);
1453
1454 lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0);
1455}
1456
1457static void
1458lomac_netinet_arp_send(struct ifnet *ifp, struct label *ifplabel,
1459 struct mbuf *m, struct label *mlabel)
1460{
1461 struct mac_lomac *dest;
1462
1463 dest = SLOT(mlabel);
1464
1465 lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0);
1466}
1467
1468static void
1469lomac_netinet_firewall_reply(struct mbuf *mrecv, struct label *mrecvlabel,
1470 struct mbuf *msend, struct label *msendlabel)
1471{
1472 struct mac_lomac *source, *dest;
1473
1474 source = SLOT(mrecvlabel);
1475 dest = SLOT(msendlabel);
1476
1477 lomac_copy_single(source, dest);
1478}
1479
1480static void
1481lomac_netinet_firewall_send(struct mbuf *m, struct label *mlabel)
1482{
1483 struct mac_lomac *dest;
1484
1485 dest = SLOT(mlabel);
1486
1487 /* XXX: where is the label for the firewall really comming from? */
1488 lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0);
1489}
1490
1491static void
1492lomac_netinet_fragment(struct mbuf *m, struct label *mlabel,
1493 struct mbuf *frag, struct label *fraglabel)
1494{
1495 struct mac_lomac *source, *dest;
1496
1497 source = SLOT(mlabel);
1498 dest = SLOT(fraglabel);
1499
1500 lomac_copy_single(source, dest);
1501}
1502
1503static void
1504lomac_netinet_icmp_reply(struct mbuf *mrecv, struct label *mrecvlabel,
1505 struct mbuf *msend, struct label *msendlabel)
1506{
1507 struct mac_lomac *source, *dest;
1508
1509 source = SLOT(mrecvlabel);
1510 dest = SLOT(msendlabel);
1511
1512 lomac_copy_single(source, dest);
1513}
1514
1515static void
1516lomac_netinet_igmp_send(struct ifnet *ifp, struct label *ifplabel,
1517 struct mbuf *m, struct label *mlabel)
1518{
1519 struct mac_lomac *dest;
1520
1521 dest = SLOT(mlabel);
1522
1523 lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0);
1524}
1525
1526static void
1527lomac_netinet6_nd6_send(struct ifnet *ifp, struct label *ifplabel,
1528 struct mbuf *m, struct label *mlabel)
1529{
1530 struct mac_lomac *dest;
1531
1532 dest = SLOT(mlabel);
1533
1534 lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0);
1535}
1536
1537static int
1538lomac_pipe_check_ioctl(struct ucred *cred, struct pipepair *pp,
1539 struct label *pplabel, unsigned long cmd, void /* caddr_t */ *data)
1540{
1541
1542 if (!lomac_enabled)
1543 return (0);
1544
1545 /* XXX: This will be implemented soon... */
1546
1547 return (0);
1548}
1549
1550static int
1551lomac_pipe_check_read(struct ucred *cred, struct pipepair *pp,
1552 struct label *pplabel)
1553{
1554 struct mac_lomac *subj, *obj;
1555
1556 if (!lomac_enabled)
1557 return (0);
1558
1559 subj = SLOT(cred->cr_label);
1560 obj = SLOT(pplabel);
1561
1562 if (!lomac_dominate_single(obj, subj))
1563 return (maybe_demote(subj, obj, "reading", "pipe", NULL));
1564
1565 return (0);
1566}
1567
1568static int
1569lomac_pipe_check_relabel(struct ucred *cred, struct pipepair *pp,
1570 struct label *pplabel, struct label *newlabel)
1571{
1572 struct mac_lomac *subj, *obj, *new;
1573 int error;
1574
1575 new = SLOT(newlabel);
1576 subj = SLOT(cred->cr_label);
1577 obj = SLOT(pplabel);
1578
1579 /*
1580 * If there is a LOMAC label update for a pipe, it must be a single
1581 * update.
1582 */
1583 error = lomac_atmostflags(new, MAC_LOMAC_FLAG_SINGLE);
1584 if (error)
1585 return (error);
1586
1587 /*
1588 * To perform a relabel of a pipe (LOMAC label or not), LOMAC must
1589 * authorize the relabel.
1590 */
1591 if (!lomac_single_in_range(obj, subj))
1592 return (EPERM);
1593
1594 /*
1595 * If the LOMAC label is to be changed, authorize as appropriate.
1596 */
1597 if (new->ml_flags & MAC_LOMAC_FLAG_SINGLE) {
1598 /*
1599 * To change the LOMAC label on a pipe, the new pipe label
1600 * must be in the subject range.
1601 */
1602 if (!lomac_single_in_range(new, subj))
1603 return (EPERM);
1604
1605 /*
1606 * To change the LOMAC label on a pipe to be EQUAL, the
1607 * subject must have appropriate privilege.
1608 */
1609 if (lomac_contains_equal(new)) {
1610 error = lomac_subject_privileged(subj);
1611 if (error)
1612 return (error);
1613 }
1614 }
1615
1616 return (0);
1617}
1618
1619static int
1620lomac_pipe_check_write(struct ucred *cred, struct pipepair *pp,
1621 struct label *pplabel)
1622{
1623 struct mac_lomac *subj, *obj;
1624
1625 if (!lomac_enabled)
1626 return (0);
1627
1628 subj = SLOT(cred->cr_label);
1629 obj = SLOT(pplabel);
1630
1631 if (!lomac_subject_dominate(subj, obj))
1632 return (EACCES);
1633
1634 return (0);
1635}
1636
1637static void
1638lomac_pipe_create(struct ucred *cred, struct pipepair *pp,
1639 struct label *pplabel)
1640{
1641 struct mac_lomac *source, *dest;
1642
1643 source = SLOT(cred->cr_label);
1644 dest = SLOT(pplabel);
1645
1646 lomac_copy_single(source, dest);
1647}
1648
1649static void
1650lomac_pipe_relabel(struct ucred *cred, struct pipepair *pp,
1651 struct label *pplabel, struct label *newlabel)
1652{
1653 struct mac_lomac *source, *dest;
1654
1655 source = SLOT(newlabel);
1656 dest = SLOT(pplabel);
1657
1658 try_relabel(source, dest);
1659}
1660
1661/*
1662 * Some system privileges are allowed regardless of integrity grade; others
1663 * are allowed only when running with privilege with respect to the LOMAC
1664 * policy as they might otherwise allow bypassing of the integrity policy.
1665 */
1666static int
1667lomac_priv_check(struct ucred *cred, int priv)
1668{
1669 struct mac_lomac *subj;
1670 int error;
1671
1672 if (!lomac_enabled)
1673 return (0);
1674
1675 /*
1676 * Exempt only specific privileges from the LOMAC integrity policy.
1677 */
1678 switch (priv) {
1679 case PRIV_KTRACE:
1680 case PRIV_MSGBUF:
1681
1682 /*
1683 * Allow processes to manipulate basic process audit properties, and
1684 * to submit audit records.
1685 */
1686 case PRIV_AUDIT_GETAUDIT:
1687 case PRIV_AUDIT_SETAUDIT:
1688 case PRIV_AUDIT_SUBMIT:
1689
1690 /*
1691 * Allow processes to manipulate their regular UNIX credentials.
1692 */
1693 case PRIV_CRED_SETUID:
1694 case PRIV_CRED_SETEUID:
1695 case PRIV_CRED_SETGID:
1696 case PRIV_CRED_SETEGID:
1697 case PRIV_CRED_SETGROUPS:
1698 case PRIV_CRED_SETREUID:
1699 case PRIV_CRED_SETREGID:
1700 case PRIV_CRED_SETRESUID:
1701 case PRIV_CRED_SETRESGID:
1702
1703 /*
1704 * Allow processes to perform system monitoring.
1705 */
1706 case PRIV_SEEOTHERGIDS:
1707 case PRIV_SEEOTHERUIDS:
1708 break;
1709
1710 /*
1711 * Allow access to general process debugging facilities. We
1712 * separately control debugging based on MAC label.
1713 */
1714 case PRIV_DEBUG_DIFFCRED:
1715 case PRIV_DEBUG_SUGID:
1716 case PRIV_DEBUG_UNPRIV:
1717
1718 /*
1719 * Allow manipulating jails.
1720 */
1721 case PRIV_JAIL_ATTACH:
1722
1723 /*
1724 * Allow privilege with respect to the Partition policy, but not the
1725 * Privs policy.
1726 */
1727 case PRIV_MAC_PARTITION:
1728
1729 /*
1730 * Allow privilege with respect to process resource limits and login
1731 * context.
1732 */
1733 case PRIV_PROC_LIMIT:
1734 case PRIV_PROC_SETLOGIN:
1735 case PRIV_PROC_SETRLIMIT:
1736
1737 /*
1738 * Allow System V and POSIX IPC privileges.
1739 */
1740 case PRIV_IPC_READ:
1741 case PRIV_IPC_WRITE:
1742 case PRIV_IPC_ADMIN:
1743 case PRIV_IPC_MSGSIZE:
1744 case PRIV_MQ_ADMIN:
1745
1746 /*
1747 * Allow certain scheduler manipulations -- possibly this should be
1748 * controlled by more fine-grained policy, as potentially low
1749 * integrity processes can deny CPU to higher integrity ones.
1750 */
1751 case PRIV_SCHED_DIFFCRED:
1752 case PRIV_SCHED_SETPRIORITY:
1753 case PRIV_SCHED_RTPRIO:
1754 case PRIV_SCHED_SETPOLICY:
1755 case PRIV_SCHED_SET:
1756 case PRIV_SCHED_SETPARAM:
1757
1758 /*
1759 * More IPC privileges.
1760 */
1761 case PRIV_SEM_WRITE:
1762
1763 /*
1764 * Allow signaling privileges subject to integrity policy.
1765 */
1766 case PRIV_SIGNAL_DIFFCRED:
1767 case PRIV_SIGNAL_SUGID:
1768
1769 /*
1770 * Allow access to only limited sysctls from lower integrity levels;
1771 * piggy-back on the Jail definition.
1772 */
1773 case PRIV_SYSCTL_WRITEJAIL:
1774
1775 /*
1776 * Allow TTY-based privileges, subject to general device access using
1777 * labels on TTY device nodes, but not console privilege.
1778 */
1779 case PRIV_TTY_DRAINWAIT:
1780 case PRIV_TTY_DTRWAIT:
1781 case PRIV_TTY_EXCLUSIVE:
1782 case PRIV_TTY_PRISON:
1783 case PRIV_TTY_STI:
1784 case PRIV_TTY_SETA:
1785
1786 /*
1787 * Grant most VFS privileges, as almost all are in practice bounded
1788 * by more specific checks using labels.
1789 */
1790 case PRIV_VFS_READ:
1791 case PRIV_VFS_WRITE:
1792 case PRIV_VFS_ADMIN:
1793 case PRIV_VFS_EXEC:
1794 case PRIV_VFS_LOOKUP:
1795 case PRIV_VFS_CHFLAGS_DEV:
1796 case PRIV_VFS_CHOWN:
1797 case PRIV_VFS_CHROOT:
1798 case PRIV_VFS_RETAINSUGID:
1799 case PRIV_VFS_EXCEEDQUOTA:
1800 case PRIV_VFS_FCHROOT:
1801 case PRIV_VFS_FHOPEN:
1802 case PRIV_VFS_FHSTATFS:
1803 case PRIV_VFS_GENERATION:
1804 case PRIV_VFS_GETFH:
1805 case PRIV_VFS_GETQUOTA:
1806 case PRIV_VFS_LINK:
1807 case PRIV_VFS_MOUNT:
1808 case PRIV_VFS_MOUNT_OWNER:
1809 case PRIV_VFS_MOUNT_PERM:
1810 case PRIV_VFS_MOUNT_SUIDDIR:
1811 case PRIV_VFS_MOUNT_NONUSER:
1812 case PRIV_VFS_SETGID:
1813 case PRIV_VFS_STICKYFILE:
1814 case PRIV_VFS_SYSFLAGS:
1815 case PRIV_VFS_UNMOUNT:
1816
1817 /*
1818 * Allow VM privileges; it would be nice if these were subject to
1819 * resource limits.
1820 */
1821 case PRIV_VM_MADV_PROTECT:
1822 case PRIV_VM_MLOCK:
1823 case PRIV_VM_MUNLOCK:
1824
1825 /*
1826 * Allow some but not all network privileges. In general, dont allow
1827 * reconfiguring the network stack, just normal use.
1828 */
1829 case PRIV_NETATALK_RESERVEDPORT:
1830 case PRIV_NETINET_RESERVEDPORT:
1831 case PRIV_NETINET_RAW:
1832 case PRIV_NETINET_REUSEPORT:
1833 case PRIV_NETIPX_RESERVEDPORT:
1834 case PRIV_NETIPX_RAW:
1835 break;
1836
1837 /*
1838 * All remaining system privileges are allow only if the process
1839 * holds privilege with respect to the LOMAC policy.
1840 */
1841 default:
1842 subj = SLOT(cred->cr_label);
1843 error = lomac_subject_privileged(subj);
1844 if (error)
1845 return (error);
1846 }
1847 return (0);
1848}
1849
1850static int
1851lomac_proc_check_debug(struct ucred *cred, struct proc *p)
1852{
1853 struct mac_lomac *subj, *obj;
1854
1855 if (!lomac_enabled)
1856 return (0);
1857
1858 subj = SLOT(cred->cr_label);
1859 obj = SLOT(p->p_ucred->cr_label);
1860
1861 /* XXX: range checks */
1862 if (!lomac_dominate_single(obj, subj))
1863 return (ESRCH);
1864 if (!lomac_subject_dominate(subj, obj))
1865 return (EACCES);
1866
1867 return (0);
1868}
1869
1870static int
1871lomac_proc_check_sched(struct ucred *cred, struct proc *p)
1872{
1873 struct mac_lomac *subj, *obj;
1874
1875 if (!lomac_enabled)
1876 return (0);
1877
1878 subj = SLOT(cred->cr_label);
1879 obj = SLOT(p->p_ucred->cr_label);
1880
1881 /* XXX: range checks */
1882 if (!lomac_dominate_single(obj, subj))
1883 return (ESRCH);
1884 if (!lomac_subject_dominate(subj, obj))
1885 return (EACCES);
1886
1887 return (0);
1888}
1889
1890static int
1891lomac_proc_check_signal(struct ucred *cred, struct proc *p, int signum)
1892{
1893 struct mac_lomac *subj, *obj;
1894
1895 if (!lomac_enabled)
1896 return (0);
1897
1898 subj = SLOT(cred->cr_label);
1899 obj = SLOT(p->p_ucred->cr_label);
1900
1901 /* XXX: range checks */
1902 if (!lomac_dominate_single(obj, subj))
1903 return (ESRCH);
1904 if (!lomac_subject_dominate(subj, obj))
1905 return (EACCES);
1906
1907 return (0);
1908}
1909
1910static void
1911lomac_proc_destroy_label(struct label *label)
1912{
1913
1914 mtx_destroy(&PSLOT(label)->mtx);
1915 free(PSLOT(label), M_LOMAC);
1916 PSLOT_SET(label, NULL);
1917}
1918
1919static void
1920lomac_proc_init_label(struct label *label)
1921{
1922
1923 PSLOT_SET(label, malloc(sizeof(struct mac_lomac_proc), M_LOMAC,
1924 M_ZERO | M_WAITOK));
1925 mtx_init(&PSLOT(label)->mtx, "MAC/Lomac proc lock", NULL, MTX_DEF);
1926}
1927
1928static int
1929lomac_socket_check_deliver(struct socket *so, struct label *solabel,
1930 struct mbuf *m, struct label *mlabel)
1931{
1932 struct mac_lomac *p, *s;
1933
1934 if (!lomac_enabled)
1935 return (0);
1936
1937 p = SLOT(mlabel);
1938 s = SLOT(solabel);
1939
1940 return (lomac_equal_single(p, s) ? 0 : EACCES);
1941}
1942
1943static int
1944lomac_socket_check_relabel(struct ucred *cred, struct socket *so,
1945 struct label *solabel, struct label *newlabel)
1946{
1947 struct mac_lomac *subj, *obj, *new;
1948 int error;
1949
1950 new = SLOT(newlabel);
1951 subj = SLOT(cred->cr_label);
1952 obj = SLOT(solabel);
1953
1954 /*
1955 * If there is a LOMAC label update for the socket, it may be an
1956 * update of single.
1957 */
1958 error = lomac_atmostflags(new, MAC_LOMAC_FLAG_SINGLE);
1959 if (error)
1960 return (error);
1961
1962 /*
1963 * To relabel a socket, the old socket single must be in the subject
1964 * range.
1965 */
1966 if (!lomac_single_in_range(obj, subj))
1967 return (EPERM);
1968
1969 /*
1970 * If the LOMAC label is to be changed, authorize as appropriate.
1971 */
1972 if (new->ml_flags & MAC_LOMAC_FLAG_SINGLE) {
1973 /*
1974 * To relabel a socket, the new socket single must be in the
1975 * subject range.
1976 */
1977 if (!lomac_single_in_range(new, subj))
1978 return (EPERM);
1979
1980 /*
1981 * To change the LOMAC label on the socket to contain EQUAL,
1982 * the subject must have appropriate privilege.
1983 */
1984 if (lomac_contains_equal(new)) {
1985 error = lomac_subject_privileged(subj);
1986 if (error)
1987 return (error);
1988 }
1989 }
1990
1991 return (0);
1992}
1993
1994static int
1995lomac_socket_check_visible(struct ucred *cred, struct socket *so,
1996 struct label *solabel)
1997{
1998 struct mac_lomac *subj, *obj;
1999
2000 if (!lomac_enabled)
2001 return (0);
2002
2003 subj = SLOT(cred->cr_label);
2004 obj = SLOT(solabel);
2005
2006 if (!lomac_dominate_single(obj, subj))
2007 return (ENOENT);
2008
2009 return (0);
2010}
2011
2012static void
2013lomac_socket_create(struct ucred *cred, struct socket *so,
2014 struct label *solabel)
2015{
2016 struct mac_lomac *source, *dest;
2017
2018 source = SLOT(cred->cr_label);
2019 dest = SLOT(solabel);
2020
2021 lomac_copy_single(source, dest);
2022}
2023
2024static void
2025lomac_socket_create_mbuf(struct socket *so, struct label *solabel,
2026 struct mbuf *m, struct label *mlabel)
2027{
2028 struct mac_lomac *source, *dest;
2029
2030 source = SLOT(solabel);
2031 dest = SLOT(mlabel);
2032
2033 lomac_copy_single(source, dest);
2034}
2035
2036static void
2037lomac_socket_newconn(struct socket *oldso, struct label *oldsolabel,
2038 struct socket *newso, struct label *newsolabel)
2039{
2040 struct mac_lomac *source, *dest;
2041
2042 source = SLOT(oldsolabel);
2043 dest = SLOT(newsolabel);
2044
2045 lomac_copy_single(source, dest);
2046}
2047
2048static void
2049lomac_socket_relabel(struct ucred *cred, struct socket *so,
2050 struct label *solabel, struct label *newlabel)
2051{
2052 struct mac_lomac *source, *dest;
2053
2054 source = SLOT(newlabel);
2055 dest = SLOT(solabel);
2056
2057 try_relabel(source, dest);
2058}
2059
2060static void
2061lomac_socketpeer_set_from_mbuf(struct mbuf *m, struct label *mlabel,
2062 struct socket *so, struct label *sopeerlabel)
2063{
2064 struct mac_lomac *source, *dest;
2065
2066 source = SLOT(mlabel);
2067 dest = SLOT(sopeerlabel);
2068
2069 lomac_copy_single(source, dest);
2070}
2071
2072static void
2073lomac_socketpeer_set_from_socket(struct socket *oldso,
2074 struct label *oldsolabel, struct socket *newso,
2075 struct label *newsopeerlabel)
2076{
2077 struct mac_lomac *source, *dest;
2078
2079 source = SLOT(oldsolabel);
2080 dest = SLOT(newsopeerlabel);
2081
2082 lomac_copy_single(source, dest);
2083}
2084
2085static void
2086lomac_syncache_create(struct label *label, struct inpcb *inp)
2087{
2088 struct mac_lomac *source, *dest;
2089
2090 source = SLOT(inp->inp_label);
2091 dest = SLOT(label);
2092 lomac_copy(source, dest);
2093}
2094
2095static void
2096lomac_syncache_create_mbuf(struct label *sc_label, struct mbuf *m,
2097 struct label *mlabel)
2098{
2099 struct mac_lomac *source, *dest;
2100
2101 source = SLOT(sc_label);
2102 dest = SLOT(mlabel);
2103 lomac_copy(source, dest);
2104}
2105
2106static int
2107lomac_system_check_acct(struct ucred *cred, struct vnode *vp,
2108 struct label *vplabel)
2109{
2110 struct mac_lomac *subj, *obj;
2111
2112 if (!lomac_enabled)
2113 return (0);
2114
2115 subj = SLOT(cred->cr_label);
2116 obj = SLOT(vplabel);
2117
2118 if (lomac_subject_privileged(subj))
2119 return (EPERM);
2120
2121 if (!lomac_high_single(obj))
2122 return (EACCES);
2123
2124 return (0);
2125}
2126
2127static int
2128lomac_system_check_auditctl(struct ucred *cred, struct vnode *vp,
2129 struct label *vplabel)
2130{
2131 struct mac_lomac *subj, *obj;
2132
2133 if (!lomac_enabled)
2134 return (0);
2135
2136 subj = SLOT(cred->cr_label);
2137 obj = SLOT(vplabel);
2138
2139 if (lomac_subject_privileged(subj))
2140 return (EPERM);
2141
2142 if (!lomac_high_single(obj))
2143 return (EACCES);
2144
2145 return (0);
2146}
2147
2148static int
2149lomac_system_check_swapoff(struct ucred *cred, struct vnode *vp,
2150 struct label *vplabel)
2151{
2152 struct mac_lomac *subj;
2153
2154 if (!lomac_enabled)
2155 return (0);
2156
2157 subj = SLOT(cred->cr_label);
2158
2159 if (lomac_subject_privileged(subj))
2160 return (EPERM);
2161
2162 return (0);
2163}
2164
2165static int
2166lomac_system_check_swapon(struct ucred *cred, struct vnode *vp,
2167 struct label *vplabel)
2168{
2169 struct mac_lomac *subj, *obj;
2170
2171 if (!lomac_enabled)
2172 return (0);
2173
2174 subj = SLOT(cred->cr_label);
2175 obj = SLOT(vplabel);
2176
2177 if (lomac_subject_privileged(subj))
2178 return (EPERM);
2179
2180 if (!lomac_high_single(obj))
2181 return (EACCES);
2182
2183 return (0);
2184}
2185
2186static int
2187lomac_system_check_sysctl(struct ucred *cred, struct sysctl_oid *oidp,
2188 void *arg1, int arg2, struct sysctl_req *req)
2189{
2190 struct mac_lomac *subj;
2191
2192 if (!lomac_enabled)
2193 return (0);
2194
2195 subj = SLOT(cred->cr_label);
2196
2197 /*
2198 * Treat sysctl variables without CTLFLAG_ANYBODY flag as lomac/high,
2199 * but also require privilege to change them.
2200 */
2201 if (req->newptr != NULL && (oidp->oid_kind & CTLFLAG_ANYBODY) == 0) {
2202#ifdef notdef
2203 if (!lomac_subject_dominate_high(subj))
2204 return (EACCES);
2205#endif
2206
2207 if (lomac_subject_privileged(subj))
2208 return (EPERM);
2209 }
2210
2211 return (0);
2212}
2213
2214static void
2215lomac_thread_userret(struct thread *td)
2216{
2217 struct proc *p = td->td_proc;
2218 struct mac_lomac_proc *subj = PSLOT(p->p_label);
2219 struct ucred *newcred, *oldcred;
2220 int dodrop;
2221
2222 mtx_lock(&subj->mtx);
2223 if (subj->mac_lomac.ml_flags & MAC_LOMAC_FLAG_UPDATE) {
2224 dodrop = 0;
2225 mtx_unlock(&subj->mtx);
2226 newcred = crget();
2227 /*
| 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
89struct mac_lomac_proc {
90 struct mac_lomac mac_lomac;
91 struct mtx mtx;
92};
93
94SYSCTL_DECL(_security_mac);
95
96SYSCTL_NODE(_security_mac, OID_AUTO, lomac, CTLFLAG_RW, 0,
97 "TrustedBSD mac_lomac policy controls");
98
99static int lomac_label_size = sizeof(struct mac_lomac);
100SYSCTL_INT(_security_mac_lomac, OID_AUTO, label_size, CTLFLAG_RD,
101 &lomac_label_size, 0, "Size of struct mac_lomac");
102
103static int lomac_enabled = 1;
104SYSCTL_INT(_security_mac_lomac, OID_AUTO, enabled, CTLFLAG_RW,
105 &lomac_enabled, 0, "Enforce MAC/LOMAC policy");
106TUNABLE_INT("security.mac.lomac.enabled", &lomac_enabled);
107
108static int destroyed_not_inited;
109SYSCTL_INT(_security_mac_lomac, OID_AUTO, destroyed_not_inited, CTLFLAG_RD,
110 &destroyed_not_inited, 0, "Count of labels destroyed but not inited");
111
112static int trust_all_interfaces = 0;
113SYSCTL_INT(_security_mac_lomac, OID_AUTO, trust_all_interfaces, CTLFLAG_RD,
114 &trust_all_interfaces, 0, "Consider all interfaces 'trusted' by MAC/LOMAC");
115TUNABLE_INT("security.mac.lomac.trust_all_interfaces", &trust_all_interfaces);
116
117static char trusted_interfaces[128];
118SYSCTL_STRING(_security_mac_lomac, OID_AUTO, trusted_interfaces, CTLFLAG_RD,
119 trusted_interfaces, 0, "Interfaces considered 'trusted' by MAC/LOMAC");
120TUNABLE_STR("security.mac.lomac.trusted_interfaces", trusted_interfaces,
121 sizeof(trusted_interfaces));
122
123static int ptys_equal = 0;
124SYSCTL_INT(_security_mac_lomac, OID_AUTO, ptys_equal, CTLFLAG_RW,
125 &ptys_equal, 0, "Label pty devices as lomac/equal on create");
126TUNABLE_INT("security.mac.lomac.ptys_equal", &ptys_equal);
127
128static int revocation_enabled = 1;
129SYSCTL_INT(_security_mac_lomac, OID_AUTO, revocation_enabled, CTLFLAG_RW,
130 &revocation_enabled, 0, "Revoke access to objects on relabel");
131TUNABLE_INT("security.mac.lomac.revocation_enabled", &revocation_enabled);
132
133static 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
140MALLOC_DEFINE(M_LOMAC, "mac_lomac_label", "MAC/LOMAC labels");
141
142static struct mac_lomac *
143lomac_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
152static void
153lomac_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
162static int
163lomac_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
171static int
172lomac_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
216static int
217lomac_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
226static int
227lomac_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
240static int
241lomac_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
255static int
256lomac_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
266static int
267lomac_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
278static int
279lomac_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
289static int
290lomac_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
301static int
302lomac_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
322static int
323lomac_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
348static int
349lomac_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
358static int
359lomac_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
428static void
429lomac_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
440static void
441lomac_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
449static void
450lomac_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
461static void
462lomac_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
472static void
473lomac_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
483static void
484lomac_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
495static int lomac_to_string(struct sbuf *sb, struct mac_lomac *ml);
496
497static int
498maybe_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 */
592static void
593try_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 */
605static void
606lomac_init(struct mac_policy_conf *conf)
607{
608
609}
610
611/*
612 * Label operations.
613 */
614static void
615lomac_init_label(struct label *label)
616{
617
618 SLOT_SET(label, lomac_alloc(M_WAITOK));
619}
620
621static int
622lomac_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
632static void
633lomac_destroy_label(struct label *label)
634{
635
636 lomac_free(SLOT(label));
637 SLOT_SET(label, NULL);
638}
639
640static int
641lomac_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
663static int
664lomac_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
703static int
704lomac_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
719static int
720lomac_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 */
756static int
757lomac_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
842static int
843lomac_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
864static void
865lomac_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 */
875static int
876lomac_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
892static void
893lomac_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
904static void
905lomac_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
916static int
917lomac_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
979static int
980lomac_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
997static void
998lomac_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
1008static void
1009lomac_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
1019static void
1020lomac_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
1030static void
1031lomac_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
1053static void
1054lomac_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
1063static void
1064lomac_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
1076static void
1077lomac_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
1088static void
1089lomac_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
1101static int
1102lomac_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
1158static int
1159lomac_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
1173static void
1174lomac_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 }
1226set:
1227 lomac_set_single(dest, grade, 0);
1228 lomac_set_range(dest, grade, 0, grade, 0);
1229}
1230
1231static void
1232lomac_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
1243static void
1244lomac_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
1255static int
1256lomac_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
1270static int
1271lomac_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
1288static void
1289lomac_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
1300static void
1301lomac_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
1312static void
1313lomac_inpcb_sosetlabel(struct socket *so, struct label *solabel,
1314 struct inpcb *inp, struct label *inplabel)
1315{
1316 struct mac_lomac *source, *dest;
1317
1318 source = SLOT(solabel);
1319 dest = SLOT(inplabel);
1320
1321 lomac_copy_single(source, dest);
1322}
1323
1324static void
1325lomac_ip6q_create(struct mbuf *m, struct label *mlabel, struct ip6q *q6,
1326 struct label *q6label)
1327{
1328 struct mac_lomac *source, *dest;
1329
1330 source = SLOT(mlabel);
1331 dest = SLOT(q6label);
1332
1333 lomac_copy_single(source, dest);
1334}
1335
1336static int
1337lomac_ip6q_match(struct mbuf *m, struct label *mlabel, struct ip6q *q6,
1338 struct label *q6label)
1339{
1340 struct mac_lomac *a, *b;
1341
1342 a = SLOT(q6label);
1343 b = SLOT(mlabel);
1344
1345 return (lomac_equal_single(a, b));
1346}
1347
1348static void
1349lomac_ip6q_reassemble(struct ip6q *q6, struct label *q6label, struct mbuf *m,
1350 struct label *mlabel)
1351{
1352 struct mac_lomac *source, *dest;
1353
1354 source = SLOT(q6label);
1355 dest = SLOT(mlabel);
1356
1357 /* Just use the head, since we require them all to match. */
1358 lomac_copy_single(source, dest);
1359}
1360
1361static void
1362lomac_ip6q_update(struct mbuf *m, struct label *mlabel, struct ip6q *q6,
1363 struct label *q6label)
1364{
1365
1366 /* NOOP: we only accept matching labels, so no need to update */
1367}
1368
1369static void
1370lomac_ipq_create(struct mbuf *m, struct label *mlabel, struct ipq *q,
1371 struct label *qlabel)
1372{
1373 struct mac_lomac *source, *dest;
1374
1375 source = SLOT(mlabel);
1376 dest = SLOT(qlabel);
1377
1378 lomac_copy_single(source, dest);
1379}
1380
1381static int
1382lomac_ipq_match(struct mbuf *m, struct label *mlabel, struct ipq *q,
1383 struct label *qlabel)
1384{
1385 struct mac_lomac *a, *b;
1386
1387 a = SLOT(qlabel);
1388 b = SLOT(mlabel);
1389
1390 return (lomac_equal_single(a, b));
1391}
1392
1393static void
1394lomac_ipq_reassemble(struct ipq *q, struct label *qlabel, struct mbuf *m,
1395 struct label *mlabel)
1396{
1397 struct mac_lomac *source, *dest;
1398
1399 source = SLOT(qlabel);
1400 dest = SLOT(mlabel);
1401
1402 /* Just use the head, since we require them all to match. */
1403 lomac_copy_single(source, dest);
1404}
1405
1406static void
1407lomac_ipq_update(struct mbuf *m, struct label *mlabel, struct ipq *q,
1408 struct label *qlabel)
1409{
1410
1411 /* NOOP: we only accept matching labels, so no need to update */
1412}
1413
1414static int
1415lomac_kld_check_load(struct ucred *cred, struct vnode *vp,
1416 struct label *vplabel)
1417{
1418 struct mac_lomac *subj, *obj;
1419
1420 if (!lomac_enabled)
1421 return (0);
1422
1423 subj = SLOT(cred->cr_label);
1424 obj = SLOT(vplabel);
1425
1426 if (lomac_subject_privileged(subj))
1427 return (EPERM);
1428
1429 if (!lomac_high_single(obj))
1430 return (EACCES);
1431
1432 return (0);
1433}
1434
1435static void
1436lomac_mount_create(struct ucred *cred, struct mount *mp,
1437 struct label *mplabel)
1438{
1439 struct mac_lomac *source, *dest;
1440
1441 source = SLOT(cred->cr_label);
1442 dest = SLOT(mplabel);
1443 lomac_copy_single(source, dest);
1444}
1445
1446static void
1447lomac_netatalk_aarp_send(struct ifnet *ifp, struct label *ifplabel,
1448 struct mbuf *m, struct label *mlabel)
1449{
1450 struct mac_lomac *dest;
1451
1452 dest = SLOT(mlabel);
1453
1454 lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0);
1455}
1456
1457static void
1458lomac_netinet_arp_send(struct ifnet *ifp, struct label *ifplabel,
1459 struct mbuf *m, struct label *mlabel)
1460{
1461 struct mac_lomac *dest;
1462
1463 dest = SLOT(mlabel);
1464
1465 lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0);
1466}
1467
1468static void
1469lomac_netinet_firewall_reply(struct mbuf *mrecv, struct label *mrecvlabel,
1470 struct mbuf *msend, struct label *msendlabel)
1471{
1472 struct mac_lomac *source, *dest;
1473
1474 source = SLOT(mrecvlabel);
1475 dest = SLOT(msendlabel);
1476
1477 lomac_copy_single(source, dest);
1478}
1479
1480static void
1481lomac_netinet_firewall_send(struct mbuf *m, struct label *mlabel)
1482{
1483 struct mac_lomac *dest;
1484
1485 dest = SLOT(mlabel);
1486
1487 /* XXX: where is the label for the firewall really comming from? */
1488 lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0);
1489}
1490
1491static void
1492lomac_netinet_fragment(struct mbuf *m, struct label *mlabel,
1493 struct mbuf *frag, struct label *fraglabel)
1494{
1495 struct mac_lomac *source, *dest;
1496
1497 source = SLOT(mlabel);
1498 dest = SLOT(fraglabel);
1499
1500 lomac_copy_single(source, dest);
1501}
1502
1503static void
1504lomac_netinet_icmp_reply(struct mbuf *mrecv, struct label *mrecvlabel,
1505 struct mbuf *msend, struct label *msendlabel)
1506{
1507 struct mac_lomac *source, *dest;
1508
1509 source = SLOT(mrecvlabel);
1510 dest = SLOT(msendlabel);
1511
1512 lomac_copy_single(source, dest);
1513}
1514
1515static void
1516lomac_netinet_igmp_send(struct ifnet *ifp, struct label *ifplabel,
1517 struct mbuf *m, struct label *mlabel)
1518{
1519 struct mac_lomac *dest;
1520
1521 dest = SLOT(mlabel);
1522
1523 lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0);
1524}
1525
1526static void
1527lomac_netinet6_nd6_send(struct ifnet *ifp, struct label *ifplabel,
1528 struct mbuf *m, struct label *mlabel)
1529{
1530 struct mac_lomac *dest;
1531
1532 dest = SLOT(mlabel);
1533
1534 lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0);
1535}
1536
1537static int
1538lomac_pipe_check_ioctl(struct ucred *cred, struct pipepair *pp,
1539 struct label *pplabel, unsigned long cmd, void /* caddr_t */ *data)
1540{
1541
1542 if (!lomac_enabled)
1543 return (0);
1544
1545 /* XXX: This will be implemented soon... */
1546
1547 return (0);
1548}
1549
1550static int
1551lomac_pipe_check_read(struct ucred *cred, struct pipepair *pp,
1552 struct label *pplabel)
1553{
1554 struct mac_lomac *subj, *obj;
1555
1556 if (!lomac_enabled)
1557 return (0);
1558
1559 subj = SLOT(cred->cr_label);
1560 obj = SLOT(pplabel);
1561
1562 if (!lomac_dominate_single(obj, subj))
1563 return (maybe_demote(subj, obj, "reading", "pipe", NULL));
1564
1565 return (0);
1566}
1567
1568static int
1569lomac_pipe_check_relabel(struct ucred *cred, struct pipepair *pp,
1570 struct label *pplabel, struct label *newlabel)
1571{
1572 struct mac_lomac *subj, *obj, *new;
1573 int error;
1574
1575 new = SLOT(newlabel);
1576 subj = SLOT(cred->cr_label);
1577 obj = SLOT(pplabel);
1578
1579 /*
1580 * If there is a LOMAC label update for a pipe, it must be a single
1581 * update.
1582 */
1583 error = lomac_atmostflags(new, MAC_LOMAC_FLAG_SINGLE);
1584 if (error)
1585 return (error);
1586
1587 /*
1588 * To perform a relabel of a pipe (LOMAC label or not), LOMAC must
1589 * authorize the relabel.
1590 */
1591 if (!lomac_single_in_range(obj, subj))
1592 return (EPERM);
1593
1594 /*
1595 * If the LOMAC label is to be changed, authorize as appropriate.
1596 */
1597 if (new->ml_flags & MAC_LOMAC_FLAG_SINGLE) {
1598 /*
1599 * To change the LOMAC label on a pipe, the new pipe label
1600 * must be in the subject range.
1601 */
1602 if (!lomac_single_in_range(new, subj))
1603 return (EPERM);
1604
1605 /*
1606 * To change the LOMAC label on a pipe to be EQUAL, the
1607 * subject must have appropriate privilege.
1608 */
1609 if (lomac_contains_equal(new)) {
1610 error = lomac_subject_privileged(subj);
1611 if (error)
1612 return (error);
1613 }
1614 }
1615
1616 return (0);
1617}
1618
1619static int
1620lomac_pipe_check_write(struct ucred *cred, struct pipepair *pp,
1621 struct label *pplabel)
1622{
1623 struct mac_lomac *subj, *obj;
1624
1625 if (!lomac_enabled)
1626 return (0);
1627
1628 subj = SLOT(cred->cr_label);
1629 obj = SLOT(pplabel);
1630
1631 if (!lomac_subject_dominate(subj, obj))
1632 return (EACCES);
1633
1634 return (0);
1635}
1636
1637static void
1638lomac_pipe_create(struct ucred *cred, struct pipepair *pp,
1639 struct label *pplabel)
1640{
1641 struct mac_lomac *source, *dest;
1642
1643 source = SLOT(cred->cr_label);
1644 dest = SLOT(pplabel);
1645
1646 lomac_copy_single(source, dest);
1647}
1648
1649static void
1650lomac_pipe_relabel(struct ucred *cred, struct pipepair *pp,
1651 struct label *pplabel, struct label *newlabel)
1652{
1653 struct mac_lomac *source, *dest;
1654
1655 source = SLOT(newlabel);
1656 dest = SLOT(pplabel);
1657
1658 try_relabel(source, dest);
1659}
1660
1661/*
1662 * Some system privileges are allowed regardless of integrity grade; others
1663 * are allowed only when running with privilege with respect to the LOMAC
1664 * policy as they might otherwise allow bypassing of the integrity policy.
1665 */
1666static int
1667lomac_priv_check(struct ucred *cred, int priv)
1668{
1669 struct mac_lomac *subj;
1670 int error;
1671
1672 if (!lomac_enabled)
1673 return (0);
1674
1675 /*
1676 * Exempt only specific privileges from the LOMAC integrity policy.
1677 */
1678 switch (priv) {
1679 case PRIV_KTRACE:
1680 case PRIV_MSGBUF:
1681
1682 /*
1683 * Allow processes to manipulate basic process audit properties, and
1684 * to submit audit records.
1685 */
1686 case PRIV_AUDIT_GETAUDIT:
1687 case PRIV_AUDIT_SETAUDIT:
1688 case PRIV_AUDIT_SUBMIT:
1689
1690 /*
1691 * Allow processes to manipulate their regular UNIX credentials.
1692 */
1693 case PRIV_CRED_SETUID:
1694 case PRIV_CRED_SETEUID:
1695 case PRIV_CRED_SETGID:
1696 case PRIV_CRED_SETEGID:
1697 case PRIV_CRED_SETGROUPS:
1698 case PRIV_CRED_SETREUID:
1699 case PRIV_CRED_SETREGID:
1700 case PRIV_CRED_SETRESUID:
1701 case PRIV_CRED_SETRESGID:
1702
1703 /*
1704 * Allow processes to perform system monitoring.
1705 */
1706 case PRIV_SEEOTHERGIDS:
1707 case PRIV_SEEOTHERUIDS:
1708 break;
1709
1710 /*
1711 * Allow access to general process debugging facilities. We
1712 * separately control debugging based on MAC label.
1713 */
1714 case PRIV_DEBUG_DIFFCRED:
1715 case PRIV_DEBUG_SUGID:
1716 case PRIV_DEBUG_UNPRIV:
1717
1718 /*
1719 * Allow manipulating jails.
1720 */
1721 case PRIV_JAIL_ATTACH:
1722
1723 /*
1724 * Allow privilege with respect to the Partition policy, but not the
1725 * Privs policy.
1726 */
1727 case PRIV_MAC_PARTITION:
1728
1729 /*
1730 * Allow privilege with respect to process resource limits and login
1731 * context.
1732 */
1733 case PRIV_PROC_LIMIT:
1734 case PRIV_PROC_SETLOGIN:
1735 case PRIV_PROC_SETRLIMIT:
1736
1737 /*
1738 * Allow System V and POSIX IPC privileges.
1739 */
1740 case PRIV_IPC_READ:
1741 case PRIV_IPC_WRITE:
1742 case PRIV_IPC_ADMIN:
1743 case PRIV_IPC_MSGSIZE:
1744 case PRIV_MQ_ADMIN:
1745
1746 /*
1747 * Allow certain scheduler manipulations -- possibly this should be
1748 * controlled by more fine-grained policy, as potentially low
1749 * integrity processes can deny CPU to higher integrity ones.
1750 */
1751 case PRIV_SCHED_DIFFCRED:
1752 case PRIV_SCHED_SETPRIORITY:
1753 case PRIV_SCHED_RTPRIO:
1754 case PRIV_SCHED_SETPOLICY:
1755 case PRIV_SCHED_SET:
1756 case PRIV_SCHED_SETPARAM:
1757
1758 /*
1759 * More IPC privileges.
1760 */
1761 case PRIV_SEM_WRITE:
1762
1763 /*
1764 * Allow signaling privileges subject to integrity policy.
1765 */
1766 case PRIV_SIGNAL_DIFFCRED:
1767 case PRIV_SIGNAL_SUGID:
1768
1769 /*
1770 * Allow access to only limited sysctls from lower integrity levels;
1771 * piggy-back on the Jail definition.
1772 */
1773 case PRIV_SYSCTL_WRITEJAIL:
1774
1775 /*
1776 * Allow TTY-based privileges, subject to general device access using
1777 * labels on TTY device nodes, but not console privilege.
1778 */
1779 case PRIV_TTY_DRAINWAIT:
1780 case PRIV_TTY_DTRWAIT:
1781 case PRIV_TTY_EXCLUSIVE:
1782 case PRIV_TTY_PRISON:
1783 case PRIV_TTY_STI:
1784 case PRIV_TTY_SETA:
1785
1786 /*
1787 * Grant most VFS privileges, as almost all are in practice bounded
1788 * by more specific checks using labels.
1789 */
1790 case PRIV_VFS_READ:
1791 case PRIV_VFS_WRITE:
1792 case PRIV_VFS_ADMIN:
1793 case PRIV_VFS_EXEC:
1794 case PRIV_VFS_LOOKUP:
1795 case PRIV_VFS_CHFLAGS_DEV:
1796 case PRIV_VFS_CHOWN:
1797 case PRIV_VFS_CHROOT:
1798 case PRIV_VFS_RETAINSUGID:
1799 case PRIV_VFS_EXCEEDQUOTA:
1800 case PRIV_VFS_FCHROOT:
1801 case PRIV_VFS_FHOPEN:
1802 case PRIV_VFS_FHSTATFS:
1803 case PRIV_VFS_GENERATION:
1804 case PRIV_VFS_GETFH:
1805 case PRIV_VFS_GETQUOTA:
1806 case PRIV_VFS_LINK:
1807 case PRIV_VFS_MOUNT:
1808 case PRIV_VFS_MOUNT_OWNER:
1809 case PRIV_VFS_MOUNT_PERM:
1810 case PRIV_VFS_MOUNT_SUIDDIR:
1811 case PRIV_VFS_MOUNT_NONUSER:
1812 case PRIV_VFS_SETGID:
1813 case PRIV_VFS_STICKYFILE:
1814 case PRIV_VFS_SYSFLAGS:
1815 case PRIV_VFS_UNMOUNT:
1816
1817 /*
1818 * Allow VM privileges; it would be nice if these were subject to
1819 * resource limits.
1820 */
1821 case PRIV_VM_MADV_PROTECT:
1822 case PRIV_VM_MLOCK:
1823 case PRIV_VM_MUNLOCK:
1824
1825 /*
1826 * Allow some but not all network privileges. In general, dont allow
1827 * reconfiguring the network stack, just normal use.
1828 */
1829 case PRIV_NETATALK_RESERVEDPORT:
1830 case PRIV_NETINET_RESERVEDPORT:
1831 case PRIV_NETINET_RAW:
1832 case PRIV_NETINET_REUSEPORT:
1833 case PRIV_NETIPX_RESERVEDPORT:
1834 case PRIV_NETIPX_RAW:
1835 break;
1836
1837 /*
1838 * All remaining system privileges are allow only if the process
1839 * holds privilege with respect to the LOMAC policy.
1840 */
1841 default:
1842 subj = SLOT(cred->cr_label);
1843 error = lomac_subject_privileged(subj);
1844 if (error)
1845 return (error);
1846 }
1847 return (0);
1848}
1849
1850static int
1851lomac_proc_check_debug(struct ucred *cred, struct proc *p)
1852{
1853 struct mac_lomac *subj, *obj;
1854
1855 if (!lomac_enabled)
1856 return (0);
1857
1858 subj = SLOT(cred->cr_label);
1859 obj = SLOT(p->p_ucred->cr_label);
1860
1861 /* XXX: range checks */
1862 if (!lomac_dominate_single(obj, subj))
1863 return (ESRCH);
1864 if (!lomac_subject_dominate(subj, obj))
1865 return (EACCES);
1866
1867 return (0);
1868}
1869
1870static int
1871lomac_proc_check_sched(struct ucred *cred, struct proc *p)
1872{
1873 struct mac_lomac *subj, *obj;
1874
1875 if (!lomac_enabled)
1876 return (0);
1877
1878 subj = SLOT(cred->cr_label);
1879 obj = SLOT(p->p_ucred->cr_label);
1880
1881 /* XXX: range checks */
1882 if (!lomac_dominate_single(obj, subj))
1883 return (ESRCH);
1884 if (!lomac_subject_dominate(subj, obj))
1885 return (EACCES);
1886
1887 return (0);
1888}
1889
1890static int
1891lomac_proc_check_signal(struct ucred *cred, struct proc *p, int signum)
1892{
1893 struct mac_lomac *subj, *obj;
1894
1895 if (!lomac_enabled)
1896 return (0);
1897
1898 subj = SLOT(cred->cr_label);
1899 obj = SLOT(p->p_ucred->cr_label);
1900
1901 /* XXX: range checks */
1902 if (!lomac_dominate_single(obj, subj))
1903 return (ESRCH);
1904 if (!lomac_subject_dominate(subj, obj))
1905 return (EACCES);
1906
1907 return (0);
1908}
1909
1910static void
1911lomac_proc_destroy_label(struct label *label)
1912{
1913
1914 mtx_destroy(&PSLOT(label)->mtx);
1915 free(PSLOT(label), M_LOMAC);
1916 PSLOT_SET(label, NULL);
1917}
1918
1919static void
1920lomac_proc_init_label(struct label *label)
1921{
1922
1923 PSLOT_SET(label, malloc(sizeof(struct mac_lomac_proc), M_LOMAC,
1924 M_ZERO | M_WAITOK));
1925 mtx_init(&PSLOT(label)->mtx, "MAC/Lomac proc lock", NULL, MTX_DEF);
1926}
1927
1928static int
1929lomac_socket_check_deliver(struct socket *so, struct label *solabel,
1930 struct mbuf *m, struct label *mlabel)
1931{
1932 struct mac_lomac *p, *s;
1933
1934 if (!lomac_enabled)
1935 return (0);
1936
1937 p = SLOT(mlabel);
1938 s = SLOT(solabel);
1939
1940 return (lomac_equal_single(p, s) ? 0 : EACCES);
1941}
1942
1943static int
1944lomac_socket_check_relabel(struct ucred *cred, struct socket *so,
1945 struct label *solabel, struct label *newlabel)
1946{
1947 struct mac_lomac *subj, *obj, *new;
1948 int error;
1949
1950 new = SLOT(newlabel);
1951 subj = SLOT(cred->cr_label);
1952 obj = SLOT(solabel);
1953
1954 /*
1955 * If there is a LOMAC label update for the socket, it may be an
1956 * update of single.
1957 */
1958 error = lomac_atmostflags(new, MAC_LOMAC_FLAG_SINGLE);
1959 if (error)
1960 return (error);
1961
1962 /*
1963 * To relabel a socket, the old socket single must be in the subject
1964 * range.
1965 */
1966 if (!lomac_single_in_range(obj, subj))
1967 return (EPERM);
1968
1969 /*
1970 * If the LOMAC label is to be changed, authorize as appropriate.
1971 */
1972 if (new->ml_flags & MAC_LOMAC_FLAG_SINGLE) {
1973 /*
1974 * To relabel a socket, the new socket single must be in the
1975 * subject range.
1976 */
1977 if (!lomac_single_in_range(new, subj))
1978 return (EPERM);
1979
1980 /*
1981 * To change the LOMAC label on the socket to contain EQUAL,
1982 * the subject must have appropriate privilege.
1983 */
1984 if (lomac_contains_equal(new)) {
1985 error = lomac_subject_privileged(subj);
1986 if (error)
1987 return (error);
1988 }
1989 }
1990
1991 return (0);
1992}
1993
1994static int
1995lomac_socket_check_visible(struct ucred *cred, struct socket *so,
1996 struct label *solabel)
1997{
1998 struct mac_lomac *subj, *obj;
1999
2000 if (!lomac_enabled)
2001 return (0);
2002
2003 subj = SLOT(cred->cr_label);
2004 obj = SLOT(solabel);
2005
2006 if (!lomac_dominate_single(obj, subj))
2007 return (ENOENT);
2008
2009 return (0);
2010}
2011
2012static void
2013lomac_socket_create(struct ucred *cred, struct socket *so,
2014 struct label *solabel)
2015{
2016 struct mac_lomac *source, *dest;
2017
2018 source = SLOT(cred->cr_label);
2019 dest = SLOT(solabel);
2020
2021 lomac_copy_single(source, dest);
2022}
2023
2024static void
2025lomac_socket_create_mbuf(struct socket *so, struct label *solabel,
2026 struct mbuf *m, struct label *mlabel)
2027{
2028 struct mac_lomac *source, *dest;
2029
2030 source = SLOT(solabel);
2031 dest = SLOT(mlabel);
2032
2033 lomac_copy_single(source, dest);
2034}
2035
2036static void
2037lomac_socket_newconn(struct socket *oldso, struct label *oldsolabel,
2038 struct socket *newso, struct label *newsolabel)
2039{
2040 struct mac_lomac *source, *dest;
2041
2042 source = SLOT(oldsolabel);
2043 dest = SLOT(newsolabel);
2044
2045 lomac_copy_single(source, dest);
2046}
2047
2048static void
2049lomac_socket_relabel(struct ucred *cred, struct socket *so,
2050 struct label *solabel, struct label *newlabel)
2051{
2052 struct mac_lomac *source, *dest;
2053
2054 source = SLOT(newlabel);
2055 dest = SLOT(solabel);
2056
2057 try_relabel(source, dest);
2058}
2059
2060static void
2061lomac_socketpeer_set_from_mbuf(struct mbuf *m, struct label *mlabel,
2062 struct socket *so, struct label *sopeerlabel)
2063{
2064 struct mac_lomac *source, *dest;
2065
2066 source = SLOT(mlabel);
2067 dest = SLOT(sopeerlabel);
2068
2069 lomac_copy_single(source, dest);
2070}
2071
2072static void
2073lomac_socketpeer_set_from_socket(struct socket *oldso,
2074 struct label *oldsolabel, struct socket *newso,
2075 struct label *newsopeerlabel)
2076{
2077 struct mac_lomac *source, *dest;
2078
2079 source = SLOT(oldsolabel);
2080 dest = SLOT(newsopeerlabel);
2081
2082 lomac_copy_single(source, dest);
2083}
2084
2085static void
2086lomac_syncache_create(struct label *label, struct inpcb *inp)
2087{
2088 struct mac_lomac *source, *dest;
2089
2090 source = SLOT(inp->inp_label);
2091 dest = SLOT(label);
2092 lomac_copy(source, dest);
2093}
2094
2095static void
2096lomac_syncache_create_mbuf(struct label *sc_label, struct mbuf *m,
2097 struct label *mlabel)
2098{
2099 struct mac_lomac *source, *dest;
2100
2101 source = SLOT(sc_label);
2102 dest = SLOT(mlabel);
2103 lomac_copy(source, dest);
2104}
2105
2106static int
2107lomac_system_check_acct(struct ucred *cred, struct vnode *vp,
2108 struct label *vplabel)
2109{
2110 struct mac_lomac *subj, *obj;
2111
2112 if (!lomac_enabled)
2113 return (0);
2114
2115 subj = SLOT(cred->cr_label);
2116 obj = SLOT(vplabel);
2117
2118 if (lomac_subject_privileged(subj))
2119 return (EPERM);
2120
2121 if (!lomac_high_single(obj))
2122 return (EACCES);
2123
2124 return (0);
2125}
2126
2127static int
2128lomac_system_check_auditctl(struct ucred *cred, struct vnode *vp,
2129 struct label *vplabel)
2130{
2131 struct mac_lomac *subj, *obj;
2132
2133 if (!lomac_enabled)
2134 return (0);
2135
2136 subj = SLOT(cred->cr_label);
2137 obj = SLOT(vplabel);
2138
2139 if (lomac_subject_privileged(subj))
2140 return (EPERM);
2141
2142 if (!lomac_high_single(obj))
2143 return (EACCES);
2144
2145 return (0);
2146}
2147
2148static int
2149lomac_system_check_swapoff(struct ucred *cred, struct vnode *vp,
2150 struct label *vplabel)
2151{
2152 struct mac_lomac *subj;
2153
2154 if (!lomac_enabled)
2155 return (0);
2156
2157 subj = SLOT(cred->cr_label);
2158
2159 if (lomac_subject_privileged(subj))
2160 return (EPERM);
2161
2162 return (0);
2163}
2164
2165static int
2166lomac_system_check_swapon(struct ucred *cred, struct vnode *vp,
2167 struct label *vplabel)
2168{
2169 struct mac_lomac *subj, *obj;
2170
2171 if (!lomac_enabled)
2172 return (0);
2173
2174 subj = SLOT(cred->cr_label);
2175 obj = SLOT(vplabel);
2176
2177 if (lomac_subject_privileged(subj))
2178 return (EPERM);
2179
2180 if (!lomac_high_single(obj))
2181 return (EACCES);
2182
2183 return (0);
2184}
2185
2186static int
2187lomac_system_check_sysctl(struct ucred *cred, struct sysctl_oid *oidp,
2188 void *arg1, int arg2, struct sysctl_req *req)
2189{
2190 struct mac_lomac *subj;
2191
2192 if (!lomac_enabled)
2193 return (0);
2194
2195 subj = SLOT(cred->cr_label);
2196
2197 /*
2198 * Treat sysctl variables without CTLFLAG_ANYBODY flag as lomac/high,
2199 * but also require privilege to change them.
2200 */
2201 if (req->newptr != NULL && (oidp->oid_kind & CTLFLAG_ANYBODY) == 0) {
2202#ifdef notdef
2203 if (!lomac_subject_dominate_high(subj))
2204 return (EACCES);
2205#endif
2206
2207 if (lomac_subject_privileged(subj))
2208 return (EPERM);
2209 }
2210
2211 return (0);
2212}
2213
2214static void
2215lomac_thread_userret(struct thread *td)
2216{
2217 struct proc *p = td->td_proc;
2218 struct mac_lomac_proc *subj = PSLOT(p->p_label);
2219 struct ucred *newcred, *oldcred;
2220 int dodrop;
2221
2222 mtx_lock(&subj->mtx);
2223 if (subj->mac_lomac.ml_flags & MAC_LOMAC_FLAG_UPDATE) {
2224 dodrop = 0;
2225 mtx_unlock(&subj->mtx);
2226 newcred = crget();
2227 /*
|
2254 mtx_unlock(&Giant);
2255 } else {
2256 mtx_unlock(&subj->mtx);
2257 }
2258}
2259
2260static int
2261lomac_vnode_associate_extattr(struct mount *mp, struct label *mplabel,
2262 struct vnode *vp, struct label *vplabel)
2263{
2264 struct mac_lomac ml_temp, *source, *dest;
2265 int buflen, error;
2266
2267 source = SLOT(mplabel);
2268 dest = SLOT(vplabel);
2269
2270 buflen = sizeof(ml_temp);
2271 bzero(&ml_temp, buflen);
2272
2273 error = vn_extattr_get(vp, IO_NODELOCKED, MAC_LOMAC_EXTATTR_NAMESPACE,
2274 MAC_LOMAC_EXTATTR_NAME, &buflen, (char *)&ml_temp, curthread);
2275 if (error == ENOATTR || error == EOPNOTSUPP) {
2276 /* Fall back to the mntlabel. */
2277 lomac_copy_single(source, dest);
2278 return (0);
2279 } else if (error)
2280 return (error);
2281
2282 if (buflen != sizeof(ml_temp)) {
2283 if (buflen != sizeof(ml_temp) - sizeof(ml_temp.ml_auxsingle)) {
2284 printf("lomac_vnode_associate_extattr: bad size %d\n",
2285 buflen);
2286 return (EPERM);
2287 }
2288 bzero(&ml_temp.ml_auxsingle, sizeof(ml_temp.ml_auxsingle));
2289 buflen = sizeof(ml_temp);
2290 (void)vn_extattr_set(vp, IO_NODELOCKED,
2291 MAC_LOMAC_EXTATTR_NAMESPACE, MAC_LOMAC_EXTATTR_NAME,
2292 buflen, (char *)&ml_temp, curthread);
2293 }
2294 if (lomac_valid(&ml_temp) != 0) {
2295 printf("lomac_vnode_associate_extattr: invalid\n");
2296 return (EPERM);
2297 }
2298 if ((ml_temp.ml_flags & MAC_LOMAC_FLAGS_BOTH) !=
2299 MAC_LOMAC_FLAG_SINGLE) {
2300 printf("lomac_vnode_associate_extattr: not single\n");
2301 return (EPERM);
2302 }
2303
2304 lomac_copy_single(&ml_temp, dest);
2305 return (0);
2306}
2307
2308static void
2309lomac_vnode_associate_singlelabel(struct mount *mp, struct label *mplabel,
2310 struct vnode *vp, struct label *vplabel)
2311{
2312 struct mac_lomac *source, *dest;
2313
2314 source = SLOT(mplabel);
2315 dest = SLOT(vplabel);
2316
2317 lomac_copy_single(source, dest);
2318}
2319
2320static int
2321lomac_vnode_check_create(struct ucred *cred, struct vnode *dvp,
2322 struct label *dvplabel, struct componentname *cnp, struct vattr *vap)
2323{
2324 struct mac_lomac *subj, *obj;
2325
2326 if (!lomac_enabled)
2327 return (0);
2328
2329 subj = SLOT(cred->cr_label);
2330 obj = SLOT(dvplabel);
2331
2332 if (!lomac_subject_dominate(subj, obj))
2333 return (EACCES);
2334 if (obj->ml_flags & MAC_LOMAC_FLAG_AUX &&
2335 !lomac_dominate_element(&subj->ml_single, &obj->ml_auxsingle))
2336 return (EACCES);
2337
2338 return (0);
2339}
2340
2341static int
2342lomac_vnode_check_deleteacl(struct ucred *cred, struct vnode *vp,
2343 struct label *vplabel, acl_type_t type)
2344{
2345 struct mac_lomac *subj, *obj;
2346
2347 if (!lomac_enabled)
2348 return (0);
2349
2350 subj = SLOT(cred->cr_label);
2351 obj = SLOT(vplabel);
2352
2353 if (!lomac_subject_dominate(subj, obj))
2354 return (EACCES);
2355
2356 return (0);
2357}
2358
2359static int
2360lomac_vnode_check_link(struct ucred *cred, struct vnode *dvp,
2361 struct label *dvplabel, struct vnode *vp, struct label *vplabel,
2362 struct componentname *cnp)
2363{
2364 struct mac_lomac *subj, *obj;
2365
2366 if (!lomac_enabled)
2367 return (0);
2368
2369 subj = SLOT(cred->cr_label);
2370 obj = SLOT(dvplabel);
2371
2372 if (!lomac_subject_dominate(subj, obj))
2373 return (EACCES);
2374
2375 obj = SLOT(vplabel);
2376
2377 if (!lomac_subject_dominate(subj, obj))
2378 return (EACCES);
2379
2380 return (0);
2381}
2382
2383static int
2384lomac_vnode_check_mmap(struct ucred *cred, struct vnode *vp,
2385 struct label *vplabel, int prot, int flags)
2386{
2387 struct mac_lomac *subj, *obj;
2388
2389 /*
2390 * Rely on the use of open()-time protections to handle
2391 * non-revocation cases.
2392 */
2393 if (!lomac_enabled)
2394 return (0);
2395
2396 subj = SLOT(cred->cr_label);
2397 obj = SLOT(vplabel);
2398
2399 if (((prot & VM_PROT_WRITE) != 0) && ((flags & MAP_SHARED) != 0)) {
2400 if (!lomac_subject_dominate(subj, obj))
2401 return (EACCES);
2402 }
2403 if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) {
2404 if (!lomac_dominate_single(obj, subj))
2405 return (maybe_demote(subj, obj, "mapping", "file", vp));
2406 }
2407
2408 return (0);
2409}
2410
2411static void
2412lomac_vnode_check_mmap_downgrade(struct ucred *cred, struct vnode *vp,
2413 struct label *vplabel, /* XXX vm_prot_t */ int *prot)
2414{
2415 struct mac_lomac *subj, *obj;
2416
2417 /*
2418 * Rely on the use of open()-time protections to handle
2419 * non-revocation cases.
2420 */
2421 if (!lomac_enabled || !revocation_enabled)
2422 return;
2423
2424 subj = SLOT(cred->cr_label);
2425 obj = SLOT(vplabel);
2426
2427 if (!lomac_subject_dominate(subj, obj))
2428 *prot &= ~VM_PROT_WRITE;
2429}
2430
2431static int
2432lomac_vnode_check_open(struct ucred *cred, struct vnode *vp,
2433 struct label *vplabel, int acc_mode)
2434{
2435 struct mac_lomac *subj, *obj;
2436
2437 if (!lomac_enabled)
2438 return (0);
2439
2440 subj = SLOT(cred->cr_label);
2441 obj = SLOT(vplabel);
2442
2443 /* XXX privilege override for admin? */
2444 if (acc_mode & (VWRITE | VAPPEND | VADMIN)) {
2445 if (!lomac_subject_dominate(subj, obj))
2446 return (EACCES);
2447 }
2448
2449 return (0);
2450}
2451
2452static int
2453lomac_vnode_check_read(struct ucred *active_cred, struct ucred *file_cred,
2454 struct vnode *vp, struct label *vplabel)
2455{
2456 struct mac_lomac *subj, *obj;
2457
2458 if (!lomac_enabled || !revocation_enabled)
2459 return (0);
2460
2461 subj = SLOT(active_cred->cr_label);
2462 obj = SLOT(vplabel);
2463
2464 if (!lomac_dominate_single(obj, subj))
2465 return (maybe_demote(subj, obj, "reading", "file", vp));
2466
2467 return (0);
2468}
2469
2470static int
2471lomac_vnode_check_relabel(struct ucred *cred, struct vnode *vp,
2472 struct label *vplabel, struct label *newlabel)
2473{
2474 struct mac_lomac *old, *new, *subj;
2475 int error;
2476
2477 old = SLOT(vplabel);
2478 new = SLOT(newlabel);
2479 subj = SLOT(cred->cr_label);
2480
2481 /*
2482 * If there is a LOMAC label update for the vnode, it must be a
2483 * single label, with an optional explicit auxiliary single.
2484 */
2485 error = lomac_atmostflags(new,
2486 MAC_LOMAC_FLAG_SINGLE | MAC_LOMAC_FLAG_AUX);
2487 if (error)
2488 return (error);
2489
2490 /*
2491 * To perform a relabel of the vnode (LOMAC label or not), LOMAC must
2492 * authorize the relabel.
2493 */
2494 if (!lomac_single_in_range(old, subj))
2495 return (EPERM);
2496
2497 /*
2498 * If the LOMAC label is to be changed, authorize as appropriate.
2499 */
2500 if (new->ml_flags & MAC_LOMAC_FLAG_SINGLE) {
2501 /*
2502 * To change the LOMAC label on a vnode, the new vnode label
2503 * must be in the subject range.
2504 */
2505 if (!lomac_single_in_range(new, subj))
2506 return (EPERM);
2507
2508 /*
2509 * To change the LOMAC label on the vnode to be EQUAL, the
2510 * subject must have appropriate privilege.
2511 */
2512 if (lomac_contains_equal(new)) {
2513 error = lomac_subject_privileged(subj);
2514 if (error)
2515 return (error);
2516 }
2517 }
2518 if (new->ml_flags & MAC_LOMAC_FLAG_AUX) {
2519 /*
2520 * Fill in the missing parts from the previous label.
2521 */
2522 if ((new->ml_flags & MAC_LOMAC_FLAG_SINGLE) == 0)
2523 lomac_copy_single(subj, new);
2524
2525 /*
2526 * To change the auxiliary LOMAC label on a vnode, the new
2527 * vnode label must be in the subject range.
2528 */
2529 if (!lomac_auxsingle_in_range(new, subj))
2530 return (EPERM);
2531
2532 /*
2533 * To change the auxiliary LOMAC label on the vnode to be
2534 * EQUAL, the subject must have appropriate privilege.
2535 */
2536 if (lomac_contains_equal(new)) {
2537 error = lomac_subject_privileged(subj);
2538 if (error)
2539 return (error);
2540 }
2541 }
2542
2543 return (0);
2544}
2545
2546static int
2547lomac_vnode_check_rename_from(struct ucred *cred, struct vnode *dvp,
2548 struct label *dvplabel, struct vnode *vp, struct label *vplabel,
2549 struct componentname *cnp)
2550{
2551 struct mac_lomac *subj, *obj;
2552
2553 if (!lomac_enabled)
2554 return (0);
2555
2556 subj = SLOT(cred->cr_label);
2557 obj = SLOT(dvplabel);
2558
2559 if (!lomac_subject_dominate(subj, obj))
2560 return (EACCES);
2561
2562 obj = SLOT(vplabel);
2563
2564 if (!lomac_subject_dominate(subj, obj))
2565 return (EACCES);
2566
2567 return (0);
2568}
2569
2570static int
2571lomac_vnode_check_rename_to(struct ucred *cred, struct vnode *dvp,
2572 struct label *dvplabel, struct vnode *vp, struct label *vplabel,
2573 int samedir, struct componentname *cnp)
2574{
2575 struct mac_lomac *subj, *obj;
2576
2577 if (!lomac_enabled)
2578 return (0);
2579
2580 subj = SLOT(cred->cr_label);
2581 obj = SLOT(dvplabel);
2582
2583 if (!lomac_subject_dominate(subj, obj))
2584 return (EACCES);
2585
2586 if (vp != NULL) {
2587 obj = SLOT(vplabel);
2588
2589 if (!lomac_subject_dominate(subj, obj))
2590 return (EACCES);
2591 }
2592
2593 return (0);
2594}
2595
2596static int
2597lomac_vnode_check_revoke(struct ucred *cred, struct vnode *vp,
2598 struct label *vplabel)
2599{
2600 struct mac_lomac *subj, *obj;
2601
2602 if (!lomac_enabled)
2603 return (0);
2604
2605 subj = SLOT(cred->cr_label);
2606 obj = SLOT(vplabel);
2607
2608 if (!lomac_subject_dominate(subj, obj))
2609 return (EACCES);
2610
2611 return (0);
2612}
2613
2614static int
2615lomac_vnode_check_setacl(struct ucred *cred, struct vnode *vp,
2616 struct label *vplabel, acl_type_t type, struct acl *acl)
2617{
2618 struct mac_lomac *subj, *obj;
2619
2620 if (!lomac_enabled)
2621 return (0);
2622
2623 subj = SLOT(cred->cr_label);
2624 obj = SLOT(vplabel);
2625
2626 if (!lomac_subject_dominate(subj, obj))
2627 return (EACCES);
2628
2629 return (0);
2630}
2631
2632static int
2633lomac_vnode_check_setextattr(struct ucred *cred, struct vnode *vp,
2634 struct label *vplabel, int attrnamespace, const char *name,
2635 struct uio *uio)
2636{
2637 struct mac_lomac *subj, *obj;
2638
2639 if (!lomac_enabled)
2640 return (0);
2641
2642 subj = SLOT(cred->cr_label);
2643 obj = SLOT(vplabel);
2644
2645 if (!lomac_subject_dominate(subj, obj))
2646 return (EACCES);
2647
2648 /* XXX: protect the MAC EA in a special way? */
2649
2650 return (0);
2651}
2652
2653static int
2654lomac_vnode_check_setflags(struct ucred *cred, struct vnode *vp,
2655 struct label *vplabel, u_long flags)
2656{
2657 struct mac_lomac *subj, *obj;
2658
2659 if (!lomac_enabled)
2660 return (0);
2661
2662 subj = SLOT(cred->cr_label);
2663 obj = SLOT(vplabel);
2664
2665 if (!lomac_subject_dominate(subj, obj))
2666 return (EACCES);
2667
2668 return (0);
2669}
2670
2671static int
2672lomac_vnode_check_setmode(struct ucred *cred, struct vnode *vp,
2673 struct label *vplabel, mode_t mode)
2674{
2675 struct mac_lomac *subj, *obj;
2676
2677 if (!lomac_enabled)
2678 return (0);
2679
2680 subj = SLOT(cred->cr_label);
2681 obj = SLOT(vplabel);
2682
2683 if (!lomac_subject_dominate(subj, obj))
2684 return (EACCES);
2685
2686 return (0);
2687}
2688
2689static int
2690lomac_vnode_check_setowner(struct ucred *cred, struct vnode *vp,
2691 struct label *vplabel, uid_t uid, gid_t gid)
2692{
2693 struct mac_lomac *subj, *obj;
2694
2695 if (!lomac_enabled)
2696 return (0);
2697
2698 subj = SLOT(cred->cr_label);
2699 obj = SLOT(vplabel);
2700
2701 if (!lomac_subject_dominate(subj, obj))
2702 return (EACCES);
2703
2704 return (0);
2705}
2706
2707static int
2708lomac_vnode_check_setutimes(struct ucred *cred, struct vnode *vp,
2709 struct label *vplabel, struct timespec atime, struct timespec mtime)
2710{
2711 struct mac_lomac *subj, *obj;
2712
2713 if (!lomac_enabled)
2714 return (0);
2715
2716 subj = SLOT(cred->cr_label);
2717 obj = SLOT(vplabel);
2718
2719 if (!lomac_subject_dominate(subj, obj))
2720 return (EACCES);
2721
2722 return (0);
2723}
2724
2725static int
2726lomac_vnode_check_unlink(struct ucred *cred, struct vnode *dvp,
2727 struct label *dvplabel, struct vnode *vp, struct label *vplabel,
2728 struct componentname *cnp)
2729{
2730 struct mac_lomac *subj, *obj;
2731
2732 if (!lomac_enabled)
2733 return (0);
2734
2735 subj = SLOT(cred->cr_label);
2736 obj = SLOT(dvplabel);
2737
2738 if (!lomac_subject_dominate(subj, obj))
2739 return (EACCES);
2740
2741 obj = SLOT(vplabel);
2742
2743 if (!lomac_subject_dominate(subj, obj))
2744 return (EACCES);
2745
2746 return (0);
2747}
2748
2749static int
2750lomac_vnode_check_write(struct ucred *active_cred,
2751 struct ucred *file_cred, struct vnode *vp, struct label *vplabel)
2752{
2753 struct mac_lomac *subj, *obj;
2754
2755 if (!lomac_enabled || !revocation_enabled)
2756 return (0);
2757
2758 subj = SLOT(active_cred->cr_label);
2759 obj = SLOT(vplabel);
2760
2761 if (!lomac_subject_dominate(subj, obj))
2762 return (EACCES);
2763
2764 return (0);
2765}
2766
2767static int
2768lomac_vnode_create_extattr(struct ucred *cred, struct mount *mp,
2769 struct label *mplabel, struct vnode *dvp, struct label *dvplabel,
2770 struct vnode *vp, struct label *vplabel, struct componentname *cnp)
2771{
2772 struct mac_lomac *source, *dest, *dir, temp;
2773 size_t buflen;
2774 int error;
2775
2776 buflen = sizeof(temp);
2777 bzero(&temp, buflen);
2778
2779 source = SLOT(cred->cr_label);
2780 dest = SLOT(vplabel);
2781 dir = SLOT(dvplabel);
2782 if (dir->ml_flags & MAC_LOMAC_FLAG_AUX) {
2783 lomac_copy_auxsingle(dir, &temp);
2784 lomac_set_single(&temp, dir->ml_auxsingle.mle_type,
2785 dir->ml_auxsingle.mle_grade);
2786 } else {
2787 lomac_copy_single(source, &temp);
2788 }
2789
2790 error = vn_extattr_set(vp, IO_NODELOCKED, MAC_LOMAC_EXTATTR_NAMESPACE,
2791 MAC_LOMAC_EXTATTR_NAME, buflen, (char *)&temp, curthread);
2792 if (error == 0)
2793 lomac_copy(&temp, dest);
2794 return (error);
2795}
2796
2797static void
2798lomac_vnode_execve_transition(struct ucred *old, struct ucred *new,
2799 struct vnode *vp, struct label *vplabel, struct label *interpvplabel,
2800 struct image_params *imgp, struct label *execlabel)
2801{
2802 struct mac_lomac *source, *dest, *obj, *robj;
2803
2804 source = SLOT(old->cr_label);
2805 dest = SLOT(new->cr_label);
2806 obj = SLOT(vplabel);
2807 robj = interpvplabel != NULL ? SLOT(interpvplabel) : obj;
2808
2809 lomac_copy(source, dest);
2810 /*
2811 * If there's an auxiliary label on the real object, respect it and
2812 * assume that this level should be assumed immediately if a higher
2813 * level is currently in place.
2814 */
2815 if (robj->ml_flags & MAC_LOMAC_FLAG_AUX &&
2816 !lomac_dominate_element(&robj->ml_auxsingle, &dest->ml_single)
2817 && lomac_auxsingle_in_range(robj, dest))
2818 lomac_set_single(dest, robj->ml_auxsingle.mle_type,
2819 robj->ml_auxsingle.mle_grade);
2820 /*
2821 * Restructuring to use the execve transitioning mechanism instead of
2822 * the normal demotion mechanism here would be difficult, so just
2823 * copy the label over and perform standard demotion. This is also
2824 * non-optimal because it will result in the intermediate label "new"
2825 * being created and immediately recycled.
2826 */
2827 if (lomac_enabled && revocation_enabled &&
2828 !lomac_dominate_single(obj, source))
2829 (void)maybe_demote(source, obj, "executing", "file", vp);
2830}
2831
2832static int
2833lomac_vnode_execve_will_transition(struct ucred *old, struct vnode *vp,
2834 struct label *vplabel, struct label *interpvplabel,
2835 struct image_params *imgp, struct label *execlabel)
2836{
2837 struct mac_lomac *subj, *obj, *robj;
2838
2839 if (!lomac_enabled || !revocation_enabled)
2840 return (0);
2841
2842 subj = SLOT(old->cr_label);
2843 obj = SLOT(vplabel);
2844 robj = interpvplabel != NULL ? SLOT(interpvplabel) : obj;
2845
2846 return ((robj->ml_flags & MAC_LOMAC_FLAG_AUX &&
2847 !lomac_dominate_element(&robj->ml_auxsingle, &subj->ml_single)
2848 && lomac_auxsingle_in_range(robj, subj)) ||
2849 !lomac_dominate_single(obj, subj));
2850}
2851
2852static void
2853lomac_vnode_relabel(struct ucred *cred, struct vnode *vp,
2854 struct label *vplabel, struct label *newlabel)
2855{
2856 struct mac_lomac *source, *dest;
2857
2858 source = SLOT(newlabel);
2859 dest = SLOT(vplabel);
2860
2861 try_relabel(source, dest);
2862}
2863
2864static int
2865lomac_vnode_setlabel_extattr(struct ucred *cred, struct vnode *vp,
2866 struct label *vplabel, struct label *intlabel)
2867{
2868 struct mac_lomac *source, temp;
2869 size_t buflen;
2870 int error;
2871
2872 buflen = sizeof(temp);
2873 bzero(&temp, buflen);
2874
2875 source = SLOT(intlabel);
2876 if ((source->ml_flags & MAC_LOMAC_FLAG_SINGLE) == 0)
2877 return (0);
2878
2879 lomac_copy_single(source, &temp);
2880 error = vn_extattr_set(vp, IO_NODELOCKED, MAC_LOMAC_EXTATTR_NAMESPACE,
2881 MAC_LOMAC_EXTATTR_NAME, buflen, (char *)&temp, curthread);
2882 return (error);
2883}
2884
2885static struct mac_policy_ops lomac_ops =
2886{
2887 .mpo_init = lomac_init,
2888
2889 .mpo_bpfdesc_check_receive = lomac_bpfdesc_check_receive,
2890 .mpo_bpfdesc_create = lomac_bpfdesc_create,
2891 .mpo_bpfdesc_create_mbuf = lomac_bpfdesc_create_mbuf,
2892 .mpo_bpfdesc_destroy_label = lomac_destroy_label,
2893 .mpo_bpfdesc_init_label = lomac_init_label,
2894
2895 .mpo_cred_check_relabel = lomac_cred_check_relabel,
2896 .mpo_cred_check_visible = lomac_cred_check_visible,
2897 .mpo_cred_copy_label = lomac_copy_label,
2898 .mpo_cred_create_swapper = lomac_cred_create_swapper,
2899 .mpo_cred_create_init = lomac_cred_create_init,
2900 .mpo_cred_destroy_label = lomac_destroy_label,
2901 .mpo_cred_externalize_label = lomac_externalize_label,
2902 .mpo_cred_init_label = lomac_init_label,
2903 .mpo_cred_internalize_label = lomac_internalize_label,
2904 .mpo_cred_relabel = lomac_cred_relabel,
2905
2906 .mpo_devfs_create_device = lomac_devfs_create_device,
2907 .mpo_devfs_create_directory = lomac_devfs_create_directory,
2908 .mpo_devfs_create_symlink = lomac_devfs_create_symlink,
2909 .mpo_devfs_destroy_label = lomac_destroy_label,
2910 .mpo_devfs_init_label = lomac_init_label,
2911 .mpo_devfs_update = lomac_devfs_update,
2912 .mpo_devfs_vnode_associate = lomac_devfs_vnode_associate,
2913
2914 .mpo_ifnet_check_relabel = lomac_ifnet_check_relabel,
2915 .mpo_ifnet_check_transmit = lomac_ifnet_check_transmit,
2916 .mpo_ifnet_copy_label = lomac_copy_label,
2917 .mpo_ifnet_create = lomac_ifnet_create,
2918 .mpo_ifnet_create_mbuf = lomac_ifnet_create_mbuf,
2919 .mpo_ifnet_destroy_label = lomac_destroy_label,
2920 .mpo_ifnet_externalize_label = lomac_externalize_label,
2921 .mpo_ifnet_init_label = lomac_init_label,
2922 .mpo_ifnet_internalize_label = lomac_internalize_label,
2923 .mpo_ifnet_relabel = lomac_ifnet_relabel,
2924
2925 .mpo_syncache_create = lomac_syncache_create,
2926 .mpo_syncache_destroy_label = lomac_destroy_label,
2927 .mpo_syncache_init_label = lomac_init_label_waitcheck,
2928
2929 .mpo_inpcb_check_deliver = lomac_inpcb_check_deliver,
2930 .mpo_inpcb_check_visible = lomac_inpcb_check_visible,
2931 .mpo_inpcb_create = lomac_inpcb_create,
2932 .mpo_inpcb_create_mbuf = lomac_inpcb_create_mbuf,
2933 .mpo_inpcb_destroy_label = lomac_destroy_label,
2934 .mpo_inpcb_init_label = lomac_init_label_waitcheck,
2935 .mpo_inpcb_sosetlabel = lomac_inpcb_sosetlabel,
2936
2937 .mpo_ip6q_create = lomac_ip6q_create,
2938 .mpo_ip6q_destroy_label = lomac_destroy_label,
2939 .mpo_ip6q_init_label = lomac_init_label_waitcheck,
2940 .mpo_ip6q_match = lomac_ip6q_match,
2941 .mpo_ip6q_reassemble = lomac_ip6q_reassemble,
2942 .mpo_ip6q_update = lomac_ip6q_update,
2943
2944 .mpo_ipq_create = lomac_ipq_create,
2945 .mpo_ipq_destroy_label = lomac_destroy_label,
2946 .mpo_ipq_init_label = lomac_init_label_waitcheck,
2947 .mpo_ipq_match = lomac_ipq_match,
2948 .mpo_ipq_reassemble = lomac_ipq_reassemble,
2949 .mpo_ipq_update = lomac_ipq_update,
2950
2951 .mpo_kld_check_load = lomac_kld_check_load,
2952
2953 .mpo_mbuf_copy_label = lomac_copy_label,
2954 .mpo_mbuf_destroy_label = lomac_destroy_label,
2955 .mpo_mbuf_init_label = lomac_init_label_waitcheck,
2956
2957 .mpo_mount_create = lomac_mount_create,
2958 .mpo_mount_destroy_label = lomac_destroy_label,
2959 .mpo_mount_init_label = lomac_init_label,
2960
2961 .mpo_netatalk_aarp_send = lomac_netatalk_aarp_send,
2962
2963 .mpo_netinet_arp_send = lomac_netinet_arp_send,
2964 .mpo_netinet_firewall_reply = lomac_netinet_firewall_reply,
2965 .mpo_netinet_firewall_send = lomac_netinet_firewall_send,
2966 .mpo_netinet_fragment = lomac_netinet_fragment,
2967 .mpo_netinet_icmp_reply = lomac_netinet_icmp_reply,
2968 .mpo_netinet_igmp_send = lomac_netinet_igmp_send,
2969
2970 .mpo_netinet6_nd6_send = lomac_netinet6_nd6_send,
2971
2972 .mpo_pipe_check_ioctl = lomac_pipe_check_ioctl,
2973 .mpo_pipe_check_read = lomac_pipe_check_read,
2974 .mpo_pipe_check_relabel = lomac_pipe_check_relabel,
2975 .mpo_pipe_check_write = lomac_pipe_check_write,
2976 .mpo_pipe_copy_label = lomac_copy_label,
2977 .mpo_pipe_create = lomac_pipe_create,
2978 .mpo_pipe_destroy_label = lomac_destroy_label,
2979 .mpo_pipe_externalize_label = lomac_externalize_label,
2980 .mpo_pipe_init_label = lomac_init_label,
2981 .mpo_pipe_internalize_label = lomac_internalize_label,
2982 .mpo_pipe_relabel = lomac_pipe_relabel,
2983
2984 .mpo_priv_check = lomac_priv_check,
2985
2986 .mpo_proc_check_debug = lomac_proc_check_debug,
2987 .mpo_proc_check_sched = lomac_proc_check_sched,
2988 .mpo_proc_check_signal = lomac_proc_check_signal,
2989 .mpo_proc_destroy_label = lomac_proc_destroy_label,
2990 .mpo_proc_init_label = lomac_proc_init_label,
2991
2992 .mpo_socket_check_deliver = lomac_socket_check_deliver,
2993 .mpo_socket_check_relabel = lomac_socket_check_relabel,
2994 .mpo_socket_check_visible = lomac_socket_check_visible,
2995 .mpo_socket_copy_label = lomac_copy_label,
2996 .mpo_socket_create = lomac_socket_create,
2997 .mpo_socket_create_mbuf = lomac_socket_create_mbuf,
2998 .mpo_socket_destroy_label = lomac_destroy_label,
2999 .mpo_socket_externalize_label = lomac_externalize_label,
3000 .mpo_socket_init_label = lomac_init_label_waitcheck,
3001 .mpo_socket_internalize_label = lomac_internalize_label,
3002 .mpo_socket_newconn = lomac_socket_newconn,
3003 .mpo_socket_relabel = lomac_socket_relabel,
3004
3005 .mpo_socketpeer_destroy_label = lomac_destroy_label,
3006 .mpo_socketpeer_externalize_label = lomac_externalize_label,
3007 .mpo_socketpeer_init_label = lomac_init_label_waitcheck,
3008 .mpo_socketpeer_set_from_mbuf = lomac_socketpeer_set_from_mbuf,
3009 .mpo_socketpeer_set_from_socket = lomac_socketpeer_set_from_socket,
3010
3011 .mpo_syncache_create_mbuf = lomac_syncache_create_mbuf,
3012
3013 .mpo_system_check_acct = lomac_system_check_acct,
3014 .mpo_system_check_auditctl = lomac_system_check_auditctl,
3015 .mpo_system_check_swapoff = lomac_system_check_swapoff,
3016 .mpo_system_check_swapon = lomac_system_check_swapon,
3017 .mpo_system_check_sysctl = lomac_system_check_sysctl,
3018
3019 .mpo_thread_userret = lomac_thread_userret,
3020
3021 .mpo_vnode_associate_extattr = lomac_vnode_associate_extattr,
3022 .mpo_vnode_associate_singlelabel = lomac_vnode_associate_singlelabel,
3023 .mpo_vnode_check_access = lomac_vnode_check_open,
3024 .mpo_vnode_check_create = lomac_vnode_check_create,
3025 .mpo_vnode_check_deleteacl = lomac_vnode_check_deleteacl,
3026 .mpo_vnode_check_link = lomac_vnode_check_link,
3027 .mpo_vnode_check_mmap = lomac_vnode_check_mmap,
3028 .mpo_vnode_check_mmap_downgrade = lomac_vnode_check_mmap_downgrade,
3029 .mpo_vnode_check_open = lomac_vnode_check_open,
3030 .mpo_vnode_check_read = lomac_vnode_check_read,
3031 .mpo_vnode_check_relabel = lomac_vnode_check_relabel,
3032 .mpo_vnode_check_rename_from = lomac_vnode_check_rename_from,
3033 .mpo_vnode_check_rename_to = lomac_vnode_check_rename_to,
3034 .mpo_vnode_check_revoke = lomac_vnode_check_revoke,
3035 .mpo_vnode_check_setacl = lomac_vnode_check_setacl,
3036 .mpo_vnode_check_setextattr = lomac_vnode_check_setextattr,
3037 .mpo_vnode_check_setflags = lomac_vnode_check_setflags,
3038 .mpo_vnode_check_setmode = lomac_vnode_check_setmode,
3039 .mpo_vnode_check_setowner = lomac_vnode_check_setowner,
3040 .mpo_vnode_check_setutimes = lomac_vnode_check_setutimes,
3041 .mpo_vnode_check_unlink = lomac_vnode_check_unlink,
3042 .mpo_vnode_check_write = lomac_vnode_check_write,
3043 .mpo_vnode_copy_label = lomac_copy_label,
3044 .mpo_vnode_create_extattr = lomac_vnode_create_extattr,
3045 .mpo_vnode_destroy_label = lomac_destroy_label,
3046 .mpo_vnode_execve_transition = lomac_vnode_execve_transition,
3047 .mpo_vnode_execve_will_transition = lomac_vnode_execve_will_transition,
3048 .mpo_vnode_externalize_label = lomac_externalize_label,
3049 .mpo_vnode_init_label = lomac_init_label,
3050 .mpo_vnode_internalize_label = lomac_internalize_label,
3051 .mpo_vnode_relabel = lomac_vnode_relabel,
3052 .mpo_vnode_setlabel_extattr = lomac_vnode_setlabel_extattr,
3053};
3054
3055#define LOMAC_OBJECTS (MPC_OBJECT_CRED | \
3056 /* MPC_OBJECT_PROC | */ \
3057 MPC_OBJECT_VNODE | \
3058 MPC_OBJECT_INPCB | \
3059 MPC_OBJECT_SOCKET | \
3060 MPC_OBJECT_DEVFS | \
3061 MPC_OBJECT_MBUF | \
3062 MPC_OBJECT_IPQ | \
3063 MPC_OBJECT_IFNET | \
3064 MPC_OBJECT_BPFDESC | \
3065 MPC_OBJECT_PIPE | \
3066 MPC_OBJECT_MOUNT | \
3067 /* MPC_OBJECT_POSIXSEM | */ \
3068 /* MPC_OBJECT_POSIXSHM | */ \
3069 /* MPC_OBJECT_SYSVMSG | */ \
3070 /* MPC_OBJECT_SYSVMSQ | */ \
3071 /* MPC_OBJECT_SYSVSEM | */ \
3072 /* MPC_OBJECT_SYSVSHM | */ \
3073 MPC_OBJECT_SYNCACHE)
3074
3075MAC_POLICY_SET(&lomac_ops, mac_lomac, "TrustedBSD MAC/LOMAC",
3076 MPC_LOADTIME_FLAG_NOTLATE, &lomac_slot, LOMAC_OBJECTS);
| 2254 mtx_unlock(&Giant);
2255 } else {
2256 mtx_unlock(&subj->mtx);
2257 }
2258}
2259
2260static int
2261lomac_vnode_associate_extattr(struct mount *mp, struct label *mplabel,
2262 struct vnode *vp, struct label *vplabel)
2263{
2264 struct mac_lomac ml_temp, *source, *dest;
2265 int buflen, error;
2266
2267 source = SLOT(mplabel);
2268 dest = SLOT(vplabel);
2269
2270 buflen = sizeof(ml_temp);
2271 bzero(&ml_temp, buflen);
2272
2273 error = vn_extattr_get(vp, IO_NODELOCKED, MAC_LOMAC_EXTATTR_NAMESPACE,
2274 MAC_LOMAC_EXTATTR_NAME, &buflen, (char *)&ml_temp, curthread);
2275 if (error == ENOATTR || error == EOPNOTSUPP) {
2276 /* Fall back to the mntlabel. */
2277 lomac_copy_single(source, dest);
2278 return (0);
2279 } else if (error)
2280 return (error);
2281
2282 if (buflen != sizeof(ml_temp)) {
2283 if (buflen != sizeof(ml_temp) - sizeof(ml_temp.ml_auxsingle)) {
2284 printf("lomac_vnode_associate_extattr: bad size %d\n",
2285 buflen);
2286 return (EPERM);
2287 }
2288 bzero(&ml_temp.ml_auxsingle, sizeof(ml_temp.ml_auxsingle));
2289 buflen = sizeof(ml_temp);
2290 (void)vn_extattr_set(vp, IO_NODELOCKED,
2291 MAC_LOMAC_EXTATTR_NAMESPACE, MAC_LOMAC_EXTATTR_NAME,
2292 buflen, (char *)&ml_temp, curthread);
2293 }
2294 if (lomac_valid(&ml_temp) != 0) {
2295 printf("lomac_vnode_associate_extattr: invalid\n");
2296 return (EPERM);
2297 }
2298 if ((ml_temp.ml_flags & MAC_LOMAC_FLAGS_BOTH) !=
2299 MAC_LOMAC_FLAG_SINGLE) {
2300 printf("lomac_vnode_associate_extattr: not single\n");
2301 return (EPERM);
2302 }
2303
2304 lomac_copy_single(&ml_temp, dest);
2305 return (0);
2306}
2307
2308static void
2309lomac_vnode_associate_singlelabel(struct mount *mp, struct label *mplabel,
2310 struct vnode *vp, struct label *vplabel)
2311{
2312 struct mac_lomac *source, *dest;
2313
2314 source = SLOT(mplabel);
2315 dest = SLOT(vplabel);
2316
2317 lomac_copy_single(source, dest);
2318}
2319
2320static int
2321lomac_vnode_check_create(struct ucred *cred, struct vnode *dvp,
2322 struct label *dvplabel, struct componentname *cnp, struct vattr *vap)
2323{
2324 struct mac_lomac *subj, *obj;
2325
2326 if (!lomac_enabled)
2327 return (0);
2328
2329 subj = SLOT(cred->cr_label);
2330 obj = SLOT(dvplabel);
2331
2332 if (!lomac_subject_dominate(subj, obj))
2333 return (EACCES);
2334 if (obj->ml_flags & MAC_LOMAC_FLAG_AUX &&
2335 !lomac_dominate_element(&subj->ml_single, &obj->ml_auxsingle))
2336 return (EACCES);
2337
2338 return (0);
2339}
2340
2341static int
2342lomac_vnode_check_deleteacl(struct ucred *cred, struct vnode *vp,
2343 struct label *vplabel, acl_type_t type)
2344{
2345 struct mac_lomac *subj, *obj;
2346
2347 if (!lomac_enabled)
2348 return (0);
2349
2350 subj = SLOT(cred->cr_label);
2351 obj = SLOT(vplabel);
2352
2353 if (!lomac_subject_dominate(subj, obj))
2354 return (EACCES);
2355
2356 return (0);
2357}
2358
2359static int
2360lomac_vnode_check_link(struct ucred *cred, struct vnode *dvp,
2361 struct label *dvplabel, struct vnode *vp, struct label *vplabel,
2362 struct componentname *cnp)
2363{
2364 struct mac_lomac *subj, *obj;
2365
2366 if (!lomac_enabled)
2367 return (0);
2368
2369 subj = SLOT(cred->cr_label);
2370 obj = SLOT(dvplabel);
2371
2372 if (!lomac_subject_dominate(subj, obj))
2373 return (EACCES);
2374
2375 obj = SLOT(vplabel);
2376
2377 if (!lomac_subject_dominate(subj, obj))
2378 return (EACCES);
2379
2380 return (0);
2381}
2382
2383static int
2384lomac_vnode_check_mmap(struct ucred *cred, struct vnode *vp,
2385 struct label *vplabel, int prot, int flags)
2386{
2387 struct mac_lomac *subj, *obj;
2388
2389 /*
2390 * Rely on the use of open()-time protections to handle
2391 * non-revocation cases.
2392 */
2393 if (!lomac_enabled)
2394 return (0);
2395
2396 subj = SLOT(cred->cr_label);
2397 obj = SLOT(vplabel);
2398
2399 if (((prot & VM_PROT_WRITE) != 0) && ((flags & MAP_SHARED) != 0)) {
2400 if (!lomac_subject_dominate(subj, obj))
2401 return (EACCES);
2402 }
2403 if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) {
2404 if (!lomac_dominate_single(obj, subj))
2405 return (maybe_demote(subj, obj, "mapping", "file", vp));
2406 }
2407
2408 return (0);
2409}
2410
2411static void
2412lomac_vnode_check_mmap_downgrade(struct ucred *cred, struct vnode *vp,
2413 struct label *vplabel, /* XXX vm_prot_t */ int *prot)
2414{
2415 struct mac_lomac *subj, *obj;
2416
2417 /*
2418 * Rely on the use of open()-time protections to handle
2419 * non-revocation cases.
2420 */
2421 if (!lomac_enabled || !revocation_enabled)
2422 return;
2423
2424 subj = SLOT(cred->cr_label);
2425 obj = SLOT(vplabel);
2426
2427 if (!lomac_subject_dominate(subj, obj))
2428 *prot &= ~VM_PROT_WRITE;
2429}
2430
2431static int
2432lomac_vnode_check_open(struct ucred *cred, struct vnode *vp,
2433 struct label *vplabel, int acc_mode)
2434{
2435 struct mac_lomac *subj, *obj;
2436
2437 if (!lomac_enabled)
2438 return (0);
2439
2440 subj = SLOT(cred->cr_label);
2441 obj = SLOT(vplabel);
2442
2443 /* XXX privilege override for admin? */
2444 if (acc_mode & (VWRITE | VAPPEND | VADMIN)) {
2445 if (!lomac_subject_dominate(subj, obj))
2446 return (EACCES);
2447 }
2448
2449 return (0);
2450}
2451
2452static int
2453lomac_vnode_check_read(struct ucred *active_cred, struct ucred *file_cred,
2454 struct vnode *vp, struct label *vplabel)
2455{
2456 struct mac_lomac *subj, *obj;
2457
2458 if (!lomac_enabled || !revocation_enabled)
2459 return (0);
2460
2461 subj = SLOT(active_cred->cr_label);
2462 obj = SLOT(vplabel);
2463
2464 if (!lomac_dominate_single(obj, subj))
2465 return (maybe_demote(subj, obj, "reading", "file", vp));
2466
2467 return (0);
2468}
2469
2470static int
2471lomac_vnode_check_relabel(struct ucred *cred, struct vnode *vp,
2472 struct label *vplabel, struct label *newlabel)
2473{
2474 struct mac_lomac *old, *new, *subj;
2475 int error;
2476
2477 old = SLOT(vplabel);
2478 new = SLOT(newlabel);
2479 subj = SLOT(cred->cr_label);
2480
2481 /*
2482 * If there is a LOMAC label update for the vnode, it must be a
2483 * single label, with an optional explicit auxiliary single.
2484 */
2485 error = lomac_atmostflags(new,
2486 MAC_LOMAC_FLAG_SINGLE | MAC_LOMAC_FLAG_AUX);
2487 if (error)
2488 return (error);
2489
2490 /*
2491 * To perform a relabel of the vnode (LOMAC label or not), LOMAC must
2492 * authorize the relabel.
2493 */
2494 if (!lomac_single_in_range(old, subj))
2495 return (EPERM);
2496
2497 /*
2498 * If the LOMAC label is to be changed, authorize as appropriate.
2499 */
2500 if (new->ml_flags & MAC_LOMAC_FLAG_SINGLE) {
2501 /*
2502 * To change the LOMAC label on a vnode, the new vnode label
2503 * must be in the subject range.
2504 */
2505 if (!lomac_single_in_range(new, subj))
2506 return (EPERM);
2507
2508 /*
2509 * To change the LOMAC label on the vnode to be EQUAL, the
2510 * subject must have appropriate privilege.
2511 */
2512 if (lomac_contains_equal(new)) {
2513 error = lomac_subject_privileged(subj);
2514 if (error)
2515 return (error);
2516 }
2517 }
2518 if (new->ml_flags & MAC_LOMAC_FLAG_AUX) {
2519 /*
2520 * Fill in the missing parts from the previous label.
2521 */
2522 if ((new->ml_flags & MAC_LOMAC_FLAG_SINGLE) == 0)
2523 lomac_copy_single(subj, new);
2524
2525 /*
2526 * To change the auxiliary LOMAC label on a vnode, the new
2527 * vnode label must be in the subject range.
2528 */
2529 if (!lomac_auxsingle_in_range(new, subj))
2530 return (EPERM);
2531
2532 /*
2533 * To change the auxiliary LOMAC label on the vnode to be
2534 * EQUAL, the subject must have appropriate privilege.
2535 */
2536 if (lomac_contains_equal(new)) {
2537 error = lomac_subject_privileged(subj);
2538 if (error)
2539 return (error);
2540 }
2541 }
2542
2543 return (0);
2544}
2545
2546static int
2547lomac_vnode_check_rename_from(struct ucred *cred, struct vnode *dvp,
2548 struct label *dvplabel, struct vnode *vp, struct label *vplabel,
2549 struct componentname *cnp)
2550{
2551 struct mac_lomac *subj, *obj;
2552
2553 if (!lomac_enabled)
2554 return (0);
2555
2556 subj = SLOT(cred->cr_label);
2557 obj = SLOT(dvplabel);
2558
2559 if (!lomac_subject_dominate(subj, obj))
2560 return (EACCES);
2561
2562 obj = SLOT(vplabel);
2563
2564 if (!lomac_subject_dominate(subj, obj))
2565 return (EACCES);
2566
2567 return (0);
2568}
2569
2570static int
2571lomac_vnode_check_rename_to(struct ucred *cred, struct vnode *dvp,
2572 struct label *dvplabel, struct vnode *vp, struct label *vplabel,
2573 int samedir, struct componentname *cnp)
2574{
2575 struct mac_lomac *subj, *obj;
2576
2577 if (!lomac_enabled)
2578 return (0);
2579
2580 subj = SLOT(cred->cr_label);
2581 obj = SLOT(dvplabel);
2582
2583 if (!lomac_subject_dominate(subj, obj))
2584 return (EACCES);
2585
2586 if (vp != NULL) {
2587 obj = SLOT(vplabel);
2588
2589 if (!lomac_subject_dominate(subj, obj))
2590 return (EACCES);
2591 }
2592
2593 return (0);
2594}
2595
2596static int
2597lomac_vnode_check_revoke(struct ucred *cred, struct vnode *vp,
2598 struct label *vplabel)
2599{
2600 struct mac_lomac *subj, *obj;
2601
2602 if (!lomac_enabled)
2603 return (0);
2604
2605 subj = SLOT(cred->cr_label);
2606 obj = SLOT(vplabel);
2607
2608 if (!lomac_subject_dominate(subj, obj))
2609 return (EACCES);
2610
2611 return (0);
2612}
2613
2614static int
2615lomac_vnode_check_setacl(struct ucred *cred, struct vnode *vp,
2616 struct label *vplabel, acl_type_t type, struct acl *acl)
2617{
2618 struct mac_lomac *subj, *obj;
2619
2620 if (!lomac_enabled)
2621 return (0);
2622
2623 subj = SLOT(cred->cr_label);
2624 obj = SLOT(vplabel);
2625
2626 if (!lomac_subject_dominate(subj, obj))
2627 return (EACCES);
2628
2629 return (0);
2630}
2631
2632static int
2633lomac_vnode_check_setextattr(struct ucred *cred, struct vnode *vp,
2634 struct label *vplabel, int attrnamespace, const char *name,
2635 struct uio *uio)
2636{
2637 struct mac_lomac *subj, *obj;
2638
2639 if (!lomac_enabled)
2640 return (0);
2641
2642 subj = SLOT(cred->cr_label);
2643 obj = SLOT(vplabel);
2644
2645 if (!lomac_subject_dominate(subj, obj))
2646 return (EACCES);
2647
2648 /* XXX: protect the MAC EA in a special way? */
2649
2650 return (0);
2651}
2652
2653static int
2654lomac_vnode_check_setflags(struct ucred *cred, struct vnode *vp,
2655 struct label *vplabel, u_long flags)
2656{
2657 struct mac_lomac *subj, *obj;
2658
2659 if (!lomac_enabled)
2660 return (0);
2661
2662 subj = SLOT(cred->cr_label);
2663 obj = SLOT(vplabel);
2664
2665 if (!lomac_subject_dominate(subj, obj))
2666 return (EACCES);
2667
2668 return (0);
2669}
2670
2671static int
2672lomac_vnode_check_setmode(struct ucred *cred, struct vnode *vp,
2673 struct label *vplabel, mode_t mode)
2674{
2675 struct mac_lomac *subj, *obj;
2676
2677 if (!lomac_enabled)
2678 return (0);
2679
2680 subj = SLOT(cred->cr_label);
2681 obj = SLOT(vplabel);
2682
2683 if (!lomac_subject_dominate(subj, obj))
2684 return (EACCES);
2685
2686 return (0);
2687}
2688
2689static int
2690lomac_vnode_check_setowner(struct ucred *cred, struct vnode *vp,
2691 struct label *vplabel, uid_t uid, gid_t gid)
2692{
2693 struct mac_lomac *subj, *obj;
2694
2695 if (!lomac_enabled)
2696 return (0);
2697
2698 subj = SLOT(cred->cr_label);
2699 obj = SLOT(vplabel);
2700
2701 if (!lomac_subject_dominate(subj, obj))
2702 return (EACCES);
2703
2704 return (0);
2705}
2706
2707static int
2708lomac_vnode_check_setutimes(struct ucred *cred, struct vnode *vp,
2709 struct label *vplabel, struct timespec atime, struct timespec mtime)
2710{
2711 struct mac_lomac *subj, *obj;
2712
2713 if (!lomac_enabled)
2714 return (0);
2715
2716 subj = SLOT(cred->cr_label);
2717 obj = SLOT(vplabel);
2718
2719 if (!lomac_subject_dominate(subj, obj))
2720 return (EACCES);
2721
2722 return (0);
2723}
2724
2725static int
2726lomac_vnode_check_unlink(struct ucred *cred, struct vnode *dvp,
2727 struct label *dvplabel, struct vnode *vp, struct label *vplabel,
2728 struct componentname *cnp)
2729{
2730 struct mac_lomac *subj, *obj;
2731
2732 if (!lomac_enabled)
2733 return (0);
2734
2735 subj = SLOT(cred->cr_label);
2736 obj = SLOT(dvplabel);
2737
2738 if (!lomac_subject_dominate(subj, obj))
2739 return (EACCES);
2740
2741 obj = SLOT(vplabel);
2742
2743 if (!lomac_subject_dominate(subj, obj))
2744 return (EACCES);
2745
2746 return (0);
2747}
2748
2749static int
2750lomac_vnode_check_write(struct ucred *active_cred,
2751 struct ucred *file_cred, struct vnode *vp, struct label *vplabel)
2752{
2753 struct mac_lomac *subj, *obj;
2754
2755 if (!lomac_enabled || !revocation_enabled)
2756 return (0);
2757
2758 subj = SLOT(active_cred->cr_label);
2759 obj = SLOT(vplabel);
2760
2761 if (!lomac_subject_dominate(subj, obj))
2762 return (EACCES);
2763
2764 return (0);
2765}
2766
2767static int
2768lomac_vnode_create_extattr(struct ucred *cred, struct mount *mp,
2769 struct label *mplabel, struct vnode *dvp, struct label *dvplabel,
2770 struct vnode *vp, struct label *vplabel, struct componentname *cnp)
2771{
2772 struct mac_lomac *source, *dest, *dir, temp;
2773 size_t buflen;
2774 int error;
2775
2776 buflen = sizeof(temp);
2777 bzero(&temp, buflen);
2778
2779 source = SLOT(cred->cr_label);
2780 dest = SLOT(vplabel);
2781 dir = SLOT(dvplabel);
2782 if (dir->ml_flags & MAC_LOMAC_FLAG_AUX) {
2783 lomac_copy_auxsingle(dir, &temp);
2784 lomac_set_single(&temp, dir->ml_auxsingle.mle_type,
2785 dir->ml_auxsingle.mle_grade);
2786 } else {
2787 lomac_copy_single(source, &temp);
2788 }
2789
2790 error = vn_extattr_set(vp, IO_NODELOCKED, MAC_LOMAC_EXTATTR_NAMESPACE,
2791 MAC_LOMAC_EXTATTR_NAME, buflen, (char *)&temp, curthread);
2792 if (error == 0)
2793 lomac_copy(&temp, dest);
2794 return (error);
2795}
2796
2797static void
2798lomac_vnode_execve_transition(struct ucred *old, struct ucred *new,
2799 struct vnode *vp, struct label *vplabel, struct label *interpvplabel,
2800 struct image_params *imgp, struct label *execlabel)
2801{
2802 struct mac_lomac *source, *dest, *obj, *robj;
2803
2804 source = SLOT(old->cr_label);
2805 dest = SLOT(new->cr_label);
2806 obj = SLOT(vplabel);
2807 robj = interpvplabel != NULL ? SLOT(interpvplabel) : obj;
2808
2809 lomac_copy(source, dest);
2810 /*
2811 * If there's an auxiliary label on the real object, respect it and
2812 * assume that this level should be assumed immediately if a higher
2813 * level is currently in place.
2814 */
2815 if (robj->ml_flags & MAC_LOMAC_FLAG_AUX &&
2816 !lomac_dominate_element(&robj->ml_auxsingle, &dest->ml_single)
2817 && lomac_auxsingle_in_range(robj, dest))
2818 lomac_set_single(dest, robj->ml_auxsingle.mle_type,
2819 robj->ml_auxsingle.mle_grade);
2820 /*
2821 * Restructuring to use the execve transitioning mechanism instead of
2822 * the normal demotion mechanism here would be difficult, so just
2823 * copy the label over and perform standard demotion. This is also
2824 * non-optimal because it will result in the intermediate label "new"
2825 * being created and immediately recycled.
2826 */
2827 if (lomac_enabled && revocation_enabled &&
2828 !lomac_dominate_single(obj, source))
2829 (void)maybe_demote(source, obj, "executing", "file", vp);
2830}
2831
2832static int
2833lomac_vnode_execve_will_transition(struct ucred *old, struct vnode *vp,
2834 struct label *vplabel, struct label *interpvplabel,
2835 struct image_params *imgp, struct label *execlabel)
2836{
2837 struct mac_lomac *subj, *obj, *robj;
2838
2839 if (!lomac_enabled || !revocation_enabled)
2840 return (0);
2841
2842 subj = SLOT(old->cr_label);
2843 obj = SLOT(vplabel);
2844 robj = interpvplabel != NULL ? SLOT(interpvplabel) : obj;
2845
2846 return ((robj->ml_flags & MAC_LOMAC_FLAG_AUX &&
2847 !lomac_dominate_element(&robj->ml_auxsingle, &subj->ml_single)
2848 && lomac_auxsingle_in_range(robj, subj)) ||
2849 !lomac_dominate_single(obj, subj));
2850}
2851
2852static void
2853lomac_vnode_relabel(struct ucred *cred, struct vnode *vp,
2854 struct label *vplabel, struct label *newlabel)
2855{
2856 struct mac_lomac *source, *dest;
2857
2858 source = SLOT(newlabel);
2859 dest = SLOT(vplabel);
2860
2861 try_relabel(source, dest);
2862}
2863
2864static int
2865lomac_vnode_setlabel_extattr(struct ucred *cred, struct vnode *vp,
2866 struct label *vplabel, struct label *intlabel)
2867{
2868 struct mac_lomac *source, temp;
2869 size_t buflen;
2870 int error;
2871
2872 buflen = sizeof(temp);
2873 bzero(&temp, buflen);
2874
2875 source = SLOT(intlabel);
2876 if ((source->ml_flags & MAC_LOMAC_FLAG_SINGLE) == 0)
2877 return (0);
2878
2879 lomac_copy_single(source, &temp);
2880 error = vn_extattr_set(vp, IO_NODELOCKED, MAC_LOMAC_EXTATTR_NAMESPACE,
2881 MAC_LOMAC_EXTATTR_NAME, buflen, (char *)&temp, curthread);
2882 return (error);
2883}
2884
2885static struct mac_policy_ops lomac_ops =
2886{
2887 .mpo_init = lomac_init,
2888
2889 .mpo_bpfdesc_check_receive = lomac_bpfdesc_check_receive,
2890 .mpo_bpfdesc_create = lomac_bpfdesc_create,
2891 .mpo_bpfdesc_create_mbuf = lomac_bpfdesc_create_mbuf,
2892 .mpo_bpfdesc_destroy_label = lomac_destroy_label,
2893 .mpo_bpfdesc_init_label = lomac_init_label,
2894
2895 .mpo_cred_check_relabel = lomac_cred_check_relabel,
2896 .mpo_cred_check_visible = lomac_cred_check_visible,
2897 .mpo_cred_copy_label = lomac_copy_label,
2898 .mpo_cred_create_swapper = lomac_cred_create_swapper,
2899 .mpo_cred_create_init = lomac_cred_create_init,
2900 .mpo_cred_destroy_label = lomac_destroy_label,
2901 .mpo_cred_externalize_label = lomac_externalize_label,
2902 .mpo_cred_init_label = lomac_init_label,
2903 .mpo_cred_internalize_label = lomac_internalize_label,
2904 .mpo_cred_relabel = lomac_cred_relabel,
2905
2906 .mpo_devfs_create_device = lomac_devfs_create_device,
2907 .mpo_devfs_create_directory = lomac_devfs_create_directory,
2908 .mpo_devfs_create_symlink = lomac_devfs_create_symlink,
2909 .mpo_devfs_destroy_label = lomac_destroy_label,
2910 .mpo_devfs_init_label = lomac_init_label,
2911 .mpo_devfs_update = lomac_devfs_update,
2912 .mpo_devfs_vnode_associate = lomac_devfs_vnode_associate,
2913
2914 .mpo_ifnet_check_relabel = lomac_ifnet_check_relabel,
2915 .mpo_ifnet_check_transmit = lomac_ifnet_check_transmit,
2916 .mpo_ifnet_copy_label = lomac_copy_label,
2917 .mpo_ifnet_create = lomac_ifnet_create,
2918 .mpo_ifnet_create_mbuf = lomac_ifnet_create_mbuf,
2919 .mpo_ifnet_destroy_label = lomac_destroy_label,
2920 .mpo_ifnet_externalize_label = lomac_externalize_label,
2921 .mpo_ifnet_init_label = lomac_init_label,
2922 .mpo_ifnet_internalize_label = lomac_internalize_label,
2923 .mpo_ifnet_relabel = lomac_ifnet_relabel,
2924
2925 .mpo_syncache_create = lomac_syncache_create,
2926 .mpo_syncache_destroy_label = lomac_destroy_label,
2927 .mpo_syncache_init_label = lomac_init_label_waitcheck,
2928
2929 .mpo_inpcb_check_deliver = lomac_inpcb_check_deliver,
2930 .mpo_inpcb_check_visible = lomac_inpcb_check_visible,
2931 .mpo_inpcb_create = lomac_inpcb_create,
2932 .mpo_inpcb_create_mbuf = lomac_inpcb_create_mbuf,
2933 .mpo_inpcb_destroy_label = lomac_destroy_label,
2934 .mpo_inpcb_init_label = lomac_init_label_waitcheck,
2935 .mpo_inpcb_sosetlabel = lomac_inpcb_sosetlabel,
2936
2937 .mpo_ip6q_create = lomac_ip6q_create,
2938 .mpo_ip6q_destroy_label = lomac_destroy_label,
2939 .mpo_ip6q_init_label = lomac_init_label_waitcheck,
2940 .mpo_ip6q_match = lomac_ip6q_match,
2941 .mpo_ip6q_reassemble = lomac_ip6q_reassemble,
2942 .mpo_ip6q_update = lomac_ip6q_update,
2943
2944 .mpo_ipq_create = lomac_ipq_create,
2945 .mpo_ipq_destroy_label = lomac_destroy_label,
2946 .mpo_ipq_init_label = lomac_init_label_waitcheck,
2947 .mpo_ipq_match = lomac_ipq_match,
2948 .mpo_ipq_reassemble = lomac_ipq_reassemble,
2949 .mpo_ipq_update = lomac_ipq_update,
2950
2951 .mpo_kld_check_load = lomac_kld_check_load,
2952
2953 .mpo_mbuf_copy_label = lomac_copy_label,
2954 .mpo_mbuf_destroy_label = lomac_destroy_label,
2955 .mpo_mbuf_init_label = lomac_init_label_waitcheck,
2956
2957 .mpo_mount_create = lomac_mount_create,
2958 .mpo_mount_destroy_label = lomac_destroy_label,
2959 .mpo_mount_init_label = lomac_init_label,
2960
2961 .mpo_netatalk_aarp_send = lomac_netatalk_aarp_send,
2962
2963 .mpo_netinet_arp_send = lomac_netinet_arp_send,
2964 .mpo_netinet_firewall_reply = lomac_netinet_firewall_reply,
2965 .mpo_netinet_firewall_send = lomac_netinet_firewall_send,
2966 .mpo_netinet_fragment = lomac_netinet_fragment,
2967 .mpo_netinet_icmp_reply = lomac_netinet_icmp_reply,
2968 .mpo_netinet_igmp_send = lomac_netinet_igmp_send,
2969
2970 .mpo_netinet6_nd6_send = lomac_netinet6_nd6_send,
2971
2972 .mpo_pipe_check_ioctl = lomac_pipe_check_ioctl,
2973 .mpo_pipe_check_read = lomac_pipe_check_read,
2974 .mpo_pipe_check_relabel = lomac_pipe_check_relabel,
2975 .mpo_pipe_check_write = lomac_pipe_check_write,
2976 .mpo_pipe_copy_label = lomac_copy_label,
2977 .mpo_pipe_create = lomac_pipe_create,
2978 .mpo_pipe_destroy_label = lomac_destroy_label,
2979 .mpo_pipe_externalize_label = lomac_externalize_label,
2980 .mpo_pipe_init_label = lomac_init_label,
2981 .mpo_pipe_internalize_label = lomac_internalize_label,
2982 .mpo_pipe_relabel = lomac_pipe_relabel,
2983
2984 .mpo_priv_check = lomac_priv_check,
2985
2986 .mpo_proc_check_debug = lomac_proc_check_debug,
2987 .mpo_proc_check_sched = lomac_proc_check_sched,
2988 .mpo_proc_check_signal = lomac_proc_check_signal,
2989 .mpo_proc_destroy_label = lomac_proc_destroy_label,
2990 .mpo_proc_init_label = lomac_proc_init_label,
2991
2992 .mpo_socket_check_deliver = lomac_socket_check_deliver,
2993 .mpo_socket_check_relabel = lomac_socket_check_relabel,
2994 .mpo_socket_check_visible = lomac_socket_check_visible,
2995 .mpo_socket_copy_label = lomac_copy_label,
2996 .mpo_socket_create = lomac_socket_create,
2997 .mpo_socket_create_mbuf = lomac_socket_create_mbuf,
2998 .mpo_socket_destroy_label = lomac_destroy_label,
2999 .mpo_socket_externalize_label = lomac_externalize_label,
3000 .mpo_socket_init_label = lomac_init_label_waitcheck,
3001 .mpo_socket_internalize_label = lomac_internalize_label,
3002 .mpo_socket_newconn = lomac_socket_newconn,
3003 .mpo_socket_relabel = lomac_socket_relabel,
3004
3005 .mpo_socketpeer_destroy_label = lomac_destroy_label,
3006 .mpo_socketpeer_externalize_label = lomac_externalize_label,
3007 .mpo_socketpeer_init_label = lomac_init_label_waitcheck,
3008 .mpo_socketpeer_set_from_mbuf = lomac_socketpeer_set_from_mbuf,
3009 .mpo_socketpeer_set_from_socket = lomac_socketpeer_set_from_socket,
3010
3011 .mpo_syncache_create_mbuf = lomac_syncache_create_mbuf,
3012
3013 .mpo_system_check_acct = lomac_system_check_acct,
3014 .mpo_system_check_auditctl = lomac_system_check_auditctl,
3015 .mpo_system_check_swapoff = lomac_system_check_swapoff,
3016 .mpo_system_check_swapon = lomac_system_check_swapon,
3017 .mpo_system_check_sysctl = lomac_system_check_sysctl,
3018
3019 .mpo_thread_userret = lomac_thread_userret,
3020
3021 .mpo_vnode_associate_extattr = lomac_vnode_associate_extattr,
3022 .mpo_vnode_associate_singlelabel = lomac_vnode_associate_singlelabel,
3023 .mpo_vnode_check_access = lomac_vnode_check_open,
3024 .mpo_vnode_check_create = lomac_vnode_check_create,
3025 .mpo_vnode_check_deleteacl = lomac_vnode_check_deleteacl,
3026 .mpo_vnode_check_link = lomac_vnode_check_link,
3027 .mpo_vnode_check_mmap = lomac_vnode_check_mmap,
3028 .mpo_vnode_check_mmap_downgrade = lomac_vnode_check_mmap_downgrade,
3029 .mpo_vnode_check_open = lomac_vnode_check_open,
3030 .mpo_vnode_check_read = lomac_vnode_check_read,
3031 .mpo_vnode_check_relabel = lomac_vnode_check_relabel,
3032 .mpo_vnode_check_rename_from = lomac_vnode_check_rename_from,
3033 .mpo_vnode_check_rename_to = lomac_vnode_check_rename_to,
3034 .mpo_vnode_check_revoke = lomac_vnode_check_revoke,
3035 .mpo_vnode_check_setacl = lomac_vnode_check_setacl,
3036 .mpo_vnode_check_setextattr = lomac_vnode_check_setextattr,
3037 .mpo_vnode_check_setflags = lomac_vnode_check_setflags,
3038 .mpo_vnode_check_setmode = lomac_vnode_check_setmode,
3039 .mpo_vnode_check_setowner = lomac_vnode_check_setowner,
3040 .mpo_vnode_check_setutimes = lomac_vnode_check_setutimes,
3041 .mpo_vnode_check_unlink = lomac_vnode_check_unlink,
3042 .mpo_vnode_check_write = lomac_vnode_check_write,
3043 .mpo_vnode_copy_label = lomac_copy_label,
3044 .mpo_vnode_create_extattr = lomac_vnode_create_extattr,
3045 .mpo_vnode_destroy_label = lomac_destroy_label,
3046 .mpo_vnode_execve_transition = lomac_vnode_execve_transition,
3047 .mpo_vnode_execve_will_transition = lomac_vnode_execve_will_transition,
3048 .mpo_vnode_externalize_label = lomac_externalize_label,
3049 .mpo_vnode_init_label = lomac_init_label,
3050 .mpo_vnode_internalize_label = lomac_internalize_label,
3051 .mpo_vnode_relabel = lomac_vnode_relabel,
3052 .mpo_vnode_setlabel_extattr = lomac_vnode_setlabel_extattr,
3053};
3054
3055#define LOMAC_OBJECTS (MPC_OBJECT_CRED | \
3056 /* MPC_OBJECT_PROC | */ \
3057 MPC_OBJECT_VNODE | \
3058 MPC_OBJECT_INPCB | \
3059 MPC_OBJECT_SOCKET | \
3060 MPC_OBJECT_DEVFS | \
3061 MPC_OBJECT_MBUF | \
3062 MPC_OBJECT_IPQ | \
3063 MPC_OBJECT_IFNET | \
3064 MPC_OBJECT_BPFDESC | \
3065 MPC_OBJECT_PIPE | \
3066 MPC_OBJECT_MOUNT | \
3067 /* MPC_OBJECT_POSIXSEM | */ \
3068 /* MPC_OBJECT_POSIXSHM | */ \
3069 /* MPC_OBJECT_SYSVMSG | */ \
3070 /* MPC_OBJECT_SYSVMSQ | */ \
3071 /* MPC_OBJECT_SYSVSEM | */ \
3072 /* MPC_OBJECT_SYSVSHM | */ \
3073 MPC_OBJECT_SYNCACHE)
3074
3075MAC_POLICY_SET(&lomac_ops, mac_lomac, "TrustedBSD MAC/LOMAC",
3076 MPC_LOADTIME_FLAG_NOTLATE, &lomac_slot, LOMAC_OBJECTS);
|