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