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