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