Cross Reference: /freebsd-11.0-release/sys/security/mac/mac

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1/*-
2 * Copyright (c) 1999, 2000, 2001, 2002 Robert N. M. Watson
3 * Copyright (c) 2001 Ilmar S. Habibulin
4 * Copyright (c) 2001, 2002 Networks Associates Technology, Inc.
5 * All rights reserved.
6 *
7 * This software was developed by Robert Watson and Ilmar Habibulin for the
8 * TrustedBSD Project.
9 *
10 * This software was developed for the FreeBSD Project in part by NAI Labs,
11 * the Security Research Division of Network Associates, Inc. under
12 * DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA
13 * CHATS research program.
14 *
15 * Redistribution and use in source and binary forms, with or without
16 * modification, are permitted provided that the following conditions
17 * are met:
18 * 1. Redistributions of source code must retain the above copyright
19 * notice, this list of conditions and the following disclaimer.
20 * 2. Redistributions in binary form must reproduce the above copyright
21 * notice, this list of conditions and the following disclaimer in the
22 * documentation and/or other materials provided with the distribution.
23 * 3. The names of the authors may not be used to endorse or promote
24 * products derived from this software without specific prior written
25 * permission.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * SUCH DAMAGE.
38 *

39 * $FreeBSD: head/sys/security/mac/mac_pipe.c 104533 2002-10-05 18:40:10Z rwatson $

39 * $FreeBSD: head/sys/security/mac/mac_pipe.c 104541 2002-10-05 21:23:47Z rwatson $

40 */
41/*
42 * Developed by the TrustedBSD Project.
43 *
44 * Framework for extensible kernel access control. Kernel and userland
45 * interface to the framework, policy registration and composition.
46 */
47
48#include "opt_mac.h"
49#include "opt_devfs.h"
50
51#include <sys/param.h>
52#include <sys/extattr.h>
53#include <sys/kernel.h>
54#include <sys/lock.h>
55#include <sys/malloc.h>
56#include <sys/mutex.h>
57#include <sys/mac.h>
58#include <sys/module.h>
59#include <sys/proc.h>
60#include <sys/systm.h>
61#include <sys/sysproto.h>
62#include <sys/sysent.h>
63#include <sys/vnode.h>
64#include <sys/mount.h>
65#include <sys/file.h>
66#include <sys/namei.h>
67#include <sys/socket.h>
68#include <sys/pipe.h>
69#include <sys/socketvar.h>
70#include <sys/sysctl.h>
71
72#include <vm/vm.h>
73#include <vm/pmap.h>
74#include <vm/vm_map.h>
75#include <vm/vm_object.h>
76
77#include <sys/mac_policy.h>
78
79#include <fs/devfs/devfs.h>
80
81#include <net/bpfdesc.h>
82#include <net/if.h>
83#include <net/if_var.h>
84
85#include <netinet/in.h>
86#include <netinet/ip_var.h>
87
88#ifdef MAC
89
90/*
91 * Declare that the kernel provides MAC support, version 1. This permits
92 * modules to refuse to be loaded if the necessary support isn't present,
93 * even if it's pre-boot.
94 */
95MODULE_VERSION(kernel_mac_support, 1);
96
97SYSCTL_DECL(_security);
98
99SYSCTL_NODE(_security, OID_AUTO, mac, CTLFLAG_RW, 0,
100 "TrustedBSD MAC policy controls");
101
102#ifndef MAC_MAX_POLICIES
103#define MAC_MAX_POLICIES 8
104#endif
105#if MAC_MAX_POLICIES > 32
106#error "MAC_MAX_POLICIES too large"
107#endif
108static unsigned int mac_max_policies = MAC_MAX_POLICIES;
109static unsigned int mac_policy_offsets_free = (1 << MAC_MAX_POLICIES) - 1;
110SYSCTL_UINT(_security_mac, OID_AUTO, max_policies, CTLFLAG_RD,
111 &mac_max_policies, 0, "");
112
113static int mac_late = 0;
114
115static int mac_enforce_fs = 1;
116SYSCTL_INT(_security_mac, OID_AUTO, enforce_fs, CTLFLAG_RW,
117 &mac_enforce_fs, 0, "Enforce MAC policy on file system objects");
118TUNABLE_INT("security.mac.enforce_fs", &mac_enforce_fs);
119
120static int mac_enforce_network = 1;
121SYSCTL_INT(_security_mac, OID_AUTO, enforce_network, CTLFLAG_RW,
122 &mac_enforce_network, 0, "Enforce MAC policy on network packets");
123TUNABLE_INT("security.mac.enforce_network", &mac_enforce_network);
124
125static int mac_enforce_pipe = 1;
126SYSCTL_INT(_security_mac, OID_AUTO, enforce_pipe, CTLFLAG_RW,
127 &mac_enforce_pipe, 0, "Enforce MAC policy on pipe operations");
128TUNABLE_INT("security.mac.enforce_pipe", &mac_enforce_pipe);
129
130static int mac_enforce_process = 1;
131SYSCTL_INT(_security_mac, OID_AUTO, enforce_process, CTLFLAG_RW,
132 &mac_enforce_process, 0, "Enforce MAC policy on inter-process operations");
133TUNABLE_INT("security.mac.enforce_process", &mac_enforce_process);
134
135static int mac_enforce_socket = 1;
136SYSCTL_INT(_security_mac, OID_AUTO, enforce_socket, CTLFLAG_RW,
137 &mac_enforce_socket, 0, "Enforce MAC policy on socket operations");
138TUNABLE_INT("security.mac.enforce_socket", &mac_enforce_socket);
139
140static int mac_enforce_vm = 1;
141SYSCTL_INT(_security_mac, OID_AUTO, enforce_vm, CTLFLAG_RW,
142 &mac_enforce_vm, 0, "Enforce MAC policy on vm operations");
143TUNABLE_INT("security.mac.enforce_vm", &mac_enforce_vm);
144
145static int mac_label_size = sizeof(struct mac);
146SYSCTL_INT(_security_mac, OID_AUTO, label_size, CTLFLAG_RD,
147 &mac_label_size, 0, "Pre-compiled MAC label size");
148
149static int mac_cache_fslabel_in_vnode = 1;
150SYSCTL_INT(_security_mac, OID_AUTO, cache_fslabel_in_vnode, CTLFLAG_RW,
151 &mac_cache_fslabel_in_vnode, 0, "Cache mount fslabel in vnode");
152TUNABLE_INT("security.mac.cache_fslabel_in_vnode",
153 &mac_cache_fslabel_in_vnode);
154
155static int mac_vnode_label_cache_hits = 0;
156SYSCTL_INT(_security_mac, OID_AUTO, vnode_label_cache_hits, CTLFLAG_RD,
157 &mac_vnode_label_cache_hits, 0, "Cache hits on vnode labels");
158static int mac_vnode_label_cache_misses = 0;
159SYSCTL_INT(_security_mac, OID_AUTO, vnode_label_cache_misses, CTLFLAG_RD,
160 &mac_vnode_label_cache_misses, 0, "Cache misses on vnode labels");
161
162static int mac_mmap_revocation = 1;
163SYSCTL_INT(_security_mac, OID_AUTO, mmap_revocation, CTLFLAG_RW,
164 &mac_mmap_revocation, 0, "Revoke mmap access to files on subject "
165 "relabel");
166static int mac_mmap_revocation_via_cow = 0;
167SYSCTL_INT(_security_mac, OID_AUTO, mmap_revocation_via_cow, CTLFLAG_RW,
168 &mac_mmap_revocation_via_cow, 0, "Revoke mmap access to files via "
169 "copy-on-write semantics, or by removing all write access");
170
171#ifdef MAC_DEBUG
172SYSCTL_NODE(_security_mac, OID_AUTO, debug, CTLFLAG_RW, 0,
173 "TrustedBSD MAC debug info");
174
175static int mac_debug_label_fallback = 0;
176SYSCTL_INT(_security_mac_debug, OID_AUTO, label_fallback, CTLFLAG_RW,
177 &mac_debug_label_fallback, 0, "Filesystems should fall back to fs label"
178 "when label is corrupted.");
179TUNABLE_INT("security.mac.debug_label_fallback",
180 &mac_debug_label_fallback);
181
182SYSCTL_NODE(_security_mac_debug, OID_AUTO, counters, CTLFLAG_RW, 0,
183 "TrustedBSD MAC object counters");
184
185static unsigned int nmacmbufs, nmaccreds, nmacifnets, nmacbpfdescs,
186 nmacsockets, nmacmounts, nmactemp, nmacvnodes, nmacdevfsdirents,
187 nmacipqs, nmacpipes;
188
189SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, mbufs, CTLFLAG_RD,
190 &nmacmbufs, 0, "number of mbufs in use");
191SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, creds, CTLFLAG_RD,
192 &nmaccreds, 0, "number of ucreds in use");
193SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, ifnets, CTLFLAG_RD,
194 &nmacifnets, 0, "number of ifnets in use");
195SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, ipqs, CTLFLAG_RD,
196 &nmacipqs, 0, "number of ipqs in use");
197SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, bpfdescs, CTLFLAG_RD,
198 &nmacbpfdescs, 0, "number of bpfdescs in use");
199SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, sockets, CTLFLAG_RD,
200 &nmacsockets, 0, "number of sockets in use");
201SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, pipes, CTLFLAG_RD,
202 &nmacpipes, 0, "number of pipes in use");
203SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, mounts, CTLFLAG_RD,
204 &nmacmounts, 0, "number of mounts in use");
205SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, temp, CTLFLAG_RD,
206 &nmactemp, 0, "number of temporary labels in use");
207SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, vnodes, CTLFLAG_RD,
208 &nmacvnodes, 0, "number of vnodes in use");
209SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, devfsdirents, CTLFLAG_RD,
210 &nmacdevfsdirents, 0, "number of devfs dirents inuse");
211#endif
212
213static int error_select(int error1, int error2);
214static int mac_externalize(struct label *label, struct mac *mac);
215static int mac_policy_register(struct mac_policy_conf *mpc);
216static int mac_policy_unregister(struct mac_policy_conf *mpc);
217
218static int mac_stdcreatevnode_ea(struct vnode *vp);
219static void mac_cred_mmapped_drop_perms(struct thread *td,
220 struct ucred *cred);
221static void mac_cred_mmapped_drop_perms_recurse(struct thread *td,
222 struct ucred *cred, struct vm_map *map);
223

224static void mac_destroy_socket_label(struct label *label);
225

226MALLOC_DEFINE(M_MACOPVEC, "macopvec", "MAC policy operation vector");
227MALLOC_DEFINE(M_MACPIPELABEL, "macpipelabel", "MAC labels for pipes");
228
229/*
230 * mac_policy_list_lock protects the consistency of 'mac_policy_list',
231 * the linked list of attached policy modules. Read-only consumers of
232 * the list must acquire a shared lock for the duration of their use;
233 * writers must acquire an exclusive lock. Note that for compound
234 * operations, locks should be held for the entire compound operation,
235 * and that this is not yet done for relabel requests.
236 */
237static struct mtx mac_policy_list_lock;
238static LIST_HEAD(, mac_policy_conf) mac_policy_list;
239static int mac_policy_list_busy;
240#define MAC_POLICY_LIST_LOCKINIT() mtx_init(&mac_policy_list_lock, \
241 "mac_policy_list_lock", NULL, MTX_DEF);
242#define MAC_POLICY_LIST_LOCK() mtx_lock(&mac_policy_list_lock);
243#define MAC_POLICY_LIST_UNLOCK() mtx_unlock(&mac_policy_list_lock);
244
245#define MAC_POLICY_LIST_BUSY() do { \
246 MAC_POLICY_LIST_LOCK(); \
247 mac_policy_list_busy++; \
248 MAC_POLICY_LIST_UNLOCK(); \
249} while (0)
250
251#define MAC_POLICY_LIST_UNBUSY() do { \
252 MAC_POLICY_LIST_LOCK(); \
253 mac_policy_list_busy--; \
254 if (mac_policy_list_busy < 0) \
255 panic("Extra mac_policy_list_busy--"); \
256 MAC_POLICY_LIST_UNLOCK(); \
257} while (0)
258
259/*
260 * MAC_CHECK performs the designated check by walking the policy
261 * module list and checking with each as to how it feels about the
262 * request. Note that it returns its value via 'error' in the scope
263 * of the caller.
264 */
265#define MAC_CHECK(check, args...) do { \
266 struct mac_policy_conf *mpc; \
267 \
268 error = 0; \
269 MAC_POLICY_LIST_BUSY(); \
270 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \
271 if (mpc->mpc_ops->mpo_ ## check != NULL) \
272 error = error_select( \
273 mpc->mpc_ops->mpo_ ## check (args), \
274 error); \
275 } \
276 MAC_POLICY_LIST_UNBUSY(); \
277} while (0)
278
279/*
280 * MAC_BOOLEAN performs the designated boolean composition by walking
281 * the module list, invoking each instance of the operation, and
282 * combining the results using the passed C operator. Note that it
283 * returns its value via 'result' in the scope of the caller, which
284 * should be initialized by the caller in a meaningful way to get
285 * a meaningful result.
286 */
287#define MAC_BOOLEAN(operation, composition, args...) do { \
288 struct mac_policy_conf *mpc; \
289 \
290 MAC_POLICY_LIST_BUSY(); \
291 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \
292 if (mpc->mpc_ops->mpo_ ## operation != NULL) \
293 result = result composition \
294 mpc->mpc_ops->mpo_ ## operation (args); \
295 } \
296 MAC_POLICY_LIST_UNBUSY(); \
297} while (0)
298
299/*
300 * MAC_PERFORM performs the designated operation by walking the policy
301 * module list and invoking that operation for each policy.
302 */
303#define MAC_PERFORM(operation, args...) do { \
304 struct mac_policy_conf *mpc; \
305 \
306 MAC_POLICY_LIST_BUSY(); \
307 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \
308 if (mpc->mpc_ops->mpo_ ## operation != NULL) \
309 mpc->mpc_ops->mpo_ ## operation (args); \
310 } \
311 MAC_POLICY_LIST_UNBUSY(); \
312} while (0)
313
314/*
315 * Initialize the MAC subsystem, including appropriate SMP locks.
316 */
317static void
318mac_init(void)
319{
320
321 LIST_INIT(&mac_policy_list);
322 MAC_POLICY_LIST_LOCKINIT();
323}
324
325/*
326 * For the purposes of modules that want to know if they were loaded
327 * "early", set the mac_late flag once we've processed modules either
328 * linked into the kernel, or loaded before the kernel startup.
329 */
330static void
331mac_late_init(void)
332{
333
334 mac_late = 1;
335}
336
337/*
338 * Allow MAC policy modules to register during boot, etc.
339 */
340int
341mac_policy_modevent(module_t mod, int type, void *data)
342{
343 struct mac_policy_conf *mpc;
344 int error;
345
346 error = 0;
347 mpc = (struct mac_policy_conf *) data;
348
349 switch (type) {
350 case MOD_LOAD:
351 if (mpc->mpc_loadtime_flags & MPC_LOADTIME_FLAG_NOTLATE &&
352 mac_late) {
353 printf("mac_policy_modevent: can't load %s policy "
354 "after booting\n", mpc->mpc_name);
355 error = EBUSY;
356 break;
357 }
358 error = mac_policy_register(mpc);
359 break;
360 case MOD_UNLOAD:
361 /* Don't unregister the module if it was never registered. */
362 if ((mpc->mpc_runtime_flags & MPC_RUNTIME_FLAG_REGISTERED)
363 != 0)
364 error = mac_policy_unregister(mpc);
365 else
366 error = 0;
367 break;
368 default:
369 break;
370 }
371
372 return (error);
373}
374
375static int
376mac_policy_register(struct mac_policy_conf *mpc)
377{
378 struct mac_policy_conf *tmpc;
379 struct mac_policy_op_entry *mpe;
380 int slot;
381
382 MALLOC(mpc->mpc_ops, struct mac_policy_ops *, sizeof(*mpc->mpc_ops),
383 M_MACOPVEC, M_WAITOK | M_ZERO);
384 for (mpe = mpc->mpc_entries; mpe->mpe_constant != MAC_OP_LAST; mpe++) {
385 switch (mpe->mpe_constant) {
386 case MAC_OP_LAST:
387 /*
388 * Doesn't actually happen, but this allows checking
389 * that all enumerated values are handled.
390 */
391 break;
392 case MAC_DESTROY:
393 mpc->mpc_ops->mpo_destroy =
394 mpe->mpe_function;
395 break;
396 case MAC_INIT:
397 mpc->mpc_ops->mpo_init =
398 mpe->mpe_function;
399 break;
400 case MAC_SYSCALL:
401 mpc->mpc_ops->mpo_syscall =
402 mpe->mpe_function;
403 break;
404 case MAC_INIT_BPFDESC_LABEL:
405 mpc->mpc_ops->mpo_init_bpfdesc_label =
406 mpe->mpe_function;
407 break;
408 case MAC_INIT_CRED_LABEL:
409 mpc->mpc_ops->mpo_init_cred_label =
410 mpe->mpe_function;
411 break;
412 case MAC_INIT_DEVFSDIRENT_LABEL:
413 mpc->mpc_ops->mpo_init_devfsdirent_label =
414 mpe->mpe_function;
415 break;
416 case MAC_INIT_IFNET_LABEL:
417 mpc->mpc_ops->mpo_init_ifnet_label =
418 mpe->mpe_function;
419 break;
420 case MAC_INIT_IPQ_LABEL:
421 mpc->mpc_ops->mpo_init_ipq_label =
422 mpe->mpe_function;
423 break;
424 case MAC_INIT_MBUF_LABEL:
425 mpc->mpc_ops->mpo_init_mbuf_label =
426 mpe->mpe_function;
427 break;
428 case MAC_INIT_MOUNT_LABEL:
429 mpc->mpc_ops->mpo_init_mount_label =
430 mpe->mpe_function;
431 break;
432 case MAC_INIT_MOUNT_FS_LABEL:
433 mpc->mpc_ops->mpo_init_mount_fs_label =
434 mpe->mpe_function;
435 break;
436 case MAC_INIT_PIPE_LABEL:
437 mpc->mpc_ops->mpo_init_pipe_label =
438 mpe->mpe_function;
439 break;
440 case MAC_INIT_SOCKET_LABEL:
441 mpc->mpc_ops->mpo_init_socket_label =
442 mpe->mpe_function;
443 break;
444 case MAC_INIT_SOCKET_PEER_LABEL:
445 mpc->mpc_ops->mpo_init_socket_peer_label =
446 mpe->mpe_function;
447 break;
448 case MAC_INIT_TEMP_LABEL:
449 mpc->mpc_ops->mpo_init_temp_label =
450 mpe->mpe_function;
451 break;
452 case MAC_INIT_VNODE_LABEL:
453 mpc->mpc_ops->mpo_init_vnode_label =
454 mpe->mpe_function;
455 break;
456 case MAC_DESTROY_BPFDESC_LABEL:
457 mpc->mpc_ops->mpo_destroy_bpfdesc_label =
458 mpe->mpe_function;
459 break;
460 case MAC_DESTROY_CRED_LABEL:
461 mpc->mpc_ops->mpo_destroy_cred_label =
462 mpe->mpe_function;
463 break;
464 case MAC_DESTROY_DEVFSDIRENT_LABEL:
465 mpc->mpc_ops->mpo_destroy_devfsdirent_label =
466 mpe->mpe_function;
467 break;
468 case MAC_DESTROY_IFNET_LABEL:
469 mpc->mpc_ops->mpo_destroy_ifnet_label =
470 mpe->mpe_function;
471 break;
472 case MAC_DESTROY_IPQ_LABEL:
473 mpc->mpc_ops->mpo_destroy_ipq_label =
474 mpe->mpe_function;
475 break;
476 case MAC_DESTROY_MBUF_LABEL:
477 mpc->mpc_ops->mpo_destroy_mbuf_label =
478 mpe->mpe_function;
479 break;
480 case MAC_DESTROY_MOUNT_LABEL:
481 mpc->mpc_ops->mpo_destroy_mount_label =
482 mpe->mpe_function;
483 break;
484 case MAC_DESTROY_MOUNT_FS_LABEL:
485 mpc->mpc_ops->mpo_destroy_mount_fs_label =
486 mpe->mpe_function;
487 break;
488 case MAC_DESTROY_PIPE_LABEL:
489 mpc->mpc_ops->mpo_destroy_pipe_label =
490 mpe->mpe_function;
491 break;
492 case MAC_DESTROY_SOCKET_LABEL:
493 mpc->mpc_ops->mpo_destroy_socket_label =
494 mpe->mpe_function;
495 break;
496 case MAC_DESTROY_SOCKET_PEER_LABEL:
497 mpc->mpc_ops->mpo_destroy_socket_peer_label =
498 mpe->mpe_function;
499 break;
500 case MAC_DESTROY_TEMP_LABEL:
501 mpc->mpc_ops->mpo_destroy_temp_label =
502 mpe->mpe_function;
503 break;
504 case MAC_DESTROY_VNODE_LABEL:
505 mpc->mpc_ops->mpo_destroy_vnode_label =
506 mpe->mpe_function;
507 break;
508 case MAC_EXTERNALIZE:
509 mpc->mpc_ops->mpo_externalize =
510 mpe->mpe_function;
511 break;
512 case MAC_INTERNALIZE:
513 mpc->mpc_ops->mpo_internalize =
514 mpe->mpe_function;
515 break;
516 case MAC_CREATE_DEVFS_DEVICE:
517 mpc->mpc_ops->mpo_create_devfs_device =
518 mpe->mpe_function;
519 break;
520 case MAC_CREATE_DEVFS_DIRECTORY:
521 mpc->mpc_ops->mpo_create_devfs_directory =
522 mpe->mpe_function;
523 break;
524 case MAC_CREATE_DEVFS_SYMLINK:
525 mpc->mpc_ops->mpo_create_devfs_symlink =
526 mpe->mpe_function;
527 break;
528 case MAC_CREATE_DEVFS_VNODE:
529 mpc->mpc_ops->mpo_create_devfs_vnode =
530 mpe->mpe_function;
531 break;
532 case MAC_STDCREATEVNODE_EA:
533 mpc->mpc_ops->mpo_stdcreatevnode_ea =
534 mpe->mpe_function;
535 break;
536 case MAC_CREATE_VNODE:
537 mpc->mpc_ops->mpo_create_vnode =
538 mpe->mpe_function;
539 break;
540 case MAC_CREATE_MOUNT:
541 mpc->mpc_ops->mpo_create_mount =
542 mpe->mpe_function;
543 break;
544 case MAC_CREATE_ROOT_MOUNT:
545 mpc->mpc_ops->mpo_create_root_mount =
546 mpe->mpe_function;
547 break;
548 case MAC_RELABEL_VNODE:
549 mpc->mpc_ops->mpo_relabel_vnode =
550 mpe->mpe_function;
551 break;
552 case MAC_UPDATE_DEVFSDIRENT:
553 mpc->mpc_ops->mpo_update_devfsdirent =
554 mpe->mpe_function;
555 break;
556 case MAC_UPDATE_PROCFSVNODE:
557 mpc->mpc_ops->mpo_update_procfsvnode =
558 mpe->mpe_function;
559 break;
560 case MAC_UPDATE_VNODE_FROM_EXTATTR:
561 mpc->mpc_ops->mpo_update_vnode_from_extattr =
562 mpe->mpe_function;
563 break;
564 case MAC_UPDATE_VNODE_FROM_EXTERNALIZED:
565 mpc->mpc_ops->mpo_update_vnode_from_externalized =
566 mpe->mpe_function;
567 break;
568 case MAC_UPDATE_VNODE_FROM_MOUNT:
569 mpc->mpc_ops->mpo_update_vnode_from_mount =
570 mpe->mpe_function;
571 break;
572 case MAC_CREATE_MBUF_FROM_SOCKET:
573 mpc->mpc_ops->mpo_create_mbuf_from_socket =
574 mpe->mpe_function;
575 break;
576 case MAC_CREATE_PIPE:
577 mpc->mpc_ops->mpo_create_pipe =
578 mpe->mpe_function;
579 break;
580 case MAC_CREATE_SOCKET:
581 mpc->mpc_ops->mpo_create_socket =
582 mpe->mpe_function;
583 break;
584 case MAC_CREATE_SOCKET_FROM_SOCKET:
585 mpc->mpc_ops->mpo_create_socket_from_socket =
586 mpe->mpe_function;
587 break;
588 case MAC_RELABEL_PIPE:
589 mpc->mpc_ops->mpo_relabel_pipe =
590 mpe->mpe_function;
591 break;
592 case MAC_RELABEL_SOCKET:
593 mpc->mpc_ops->mpo_relabel_socket =
594 mpe->mpe_function;
595 break;
596 case MAC_SET_SOCKET_PEER_FROM_MBUF:
597 mpc->mpc_ops->mpo_set_socket_peer_from_mbuf =
598 mpe->mpe_function;
599 break;
600 case MAC_SET_SOCKET_PEER_FROM_SOCKET:
601 mpc->mpc_ops->mpo_set_socket_peer_from_socket =
602 mpe->mpe_function;
603 break;
604 case MAC_CREATE_BPFDESC:
605 mpc->mpc_ops->mpo_create_bpfdesc =
606 mpe->mpe_function;
607 break;
608 case MAC_CREATE_DATAGRAM_FROM_IPQ:
609 mpc->mpc_ops->mpo_create_datagram_from_ipq =
610 mpe->mpe_function;
611 break;
612 case MAC_CREATE_FRAGMENT:
613 mpc->mpc_ops->mpo_create_fragment =
614 mpe->mpe_function;
615 break;
616 case MAC_CREATE_IFNET:
617 mpc->mpc_ops->mpo_create_ifnet =
618 mpe->mpe_function;
619 break;
620 case MAC_CREATE_IPQ:
621 mpc->mpc_ops->mpo_create_ipq =
622 mpe->mpe_function;
623 break;
624 case MAC_CREATE_MBUF_FROM_MBUF:
625 mpc->mpc_ops->mpo_create_mbuf_from_mbuf =
626 mpe->mpe_function;
627 break;
628 case MAC_CREATE_MBUF_LINKLAYER:
629 mpc->mpc_ops->mpo_create_mbuf_linklayer =
630 mpe->mpe_function;
631 break;
632 case MAC_CREATE_MBUF_FROM_BPFDESC:
633 mpc->mpc_ops->mpo_create_mbuf_from_bpfdesc =
634 mpe->mpe_function;
635 break;
636 case MAC_CREATE_MBUF_FROM_IFNET:
637 mpc->mpc_ops->mpo_create_mbuf_from_ifnet =
638 mpe->mpe_function;
639 break;
640 case MAC_CREATE_MBUF_MULTICAST_ENCAP:
641 mpc->mpc_ops->mpo_create_mbuf_multicast_encap =
642 mpe->mpe_function;
643 break;
644 case MAC_CREATE_MBUF_NETLAYER:
645 mpc->mpc_ops->mpo_create_mbuf_netlayer =
646 mpe->mpe_function;
647 break;
648 case MAC_FRAGMENT_MATCH:
649 mpc->mpc_ops->mpo_fragment_match =
650 mpe->mpe_function;
651 break;
652 case MAC_RELABEL_IFNET:
653 mpc->mpc_ops->mpo_relabel_ifnet =
654 mpe->mpe_function;
655 break;
656 case MAC_UPDATE_IPQ:
657 mpc->mpc_ops->mpo_update_ipq =
658 mpe->mpe_function;
659 break;
660 case MAC_CREATE_CRED:
661 mpc->mpc_ops->mpo_create_cred =
662 mpe->mpe_function;
663 break;
664 case MAC_EXECVE_TRANSITION:
665 mpc->mpc_ops->mpo_execve_transition =
666 mpe->mpe_function;
667 break;
668 case MAC_EXECVE_WILL_TRANSITION:
669 mpc->mpc_ops->mpo_execve_will_transition =
670 mpe->mpe_function;
671 break;
672 case MAC_CREATE_PROC0:
673 mpc->mpc_ops->mpo_create_proc0 =
674 mpe->mpe_function;
675 break;
676 case MAC_CREATE_PROC1:
677 mpc->mpc_ops->mpo_create_proc1 =
678 mpe->mpe_function;
679 break;
680 case MAC_RELABEL_CRED:
681 mpc->mpc_ops->mpo_relabel_cred =
682 mpe->mpe_function;
683 break;
684 case MAC_THREAD_USERRET:
685 mpc->mpc_ops->mpo_thread_userret =
686 mpe->mpe_function;
687 break;
688 case MAC_CHECK_BPFDESC_RECEIVE:
689 mpc->mpc_ops->mpo_check_bpfdesc_receive =
690 mpe->mpe_function;
691 break;
692 case MAC_CHECK_CRED_RELABEL:
693 mpc->mpc_ops->mpo_check_cred_relabel =
694 mpe->mpe_function;
695 break;
696 case MAC_CHECK_CRED_VISIBLE:
697 mpc->mpc_ops->mpo_check_cred_visible =
698 mpe->mpe_function;
699 break;
700 case MAC_CHECK_IFNET_RELABEL:
701 mpc->mpc_ops->mpo_check_ifnet_relabel =
702 mpe->mpe_function;
703 break;
704 case MAC_CHECK_IFNET_TRANSMIT:
705 mpc->mpc_ops->mpo_check_ifnet_transmit =
706 mpe->mpe_function;
707 break;
708 case MAC_CHECK_MOUNT_STAT:
709 mpc->mpc_ops->mpo_check_mount_stat =
710 mpe->mpe_function;
711 break;
712 case MAC_CHECK_PIPE_IOCTL:
713 mpc->mpc_ops->mpo_check_pipe_ioctl =
714 mpe->mpe_function;
715 break;
716 case MAC_CHECK_PIPE_POLL:
717 mpc->mpc_ops->mpo_check_pipe_poll =
718 mpe->mpe_function;
719 break;
720 case MAC_CHECK_PIPE_READ:
721 mpc->mpc_ops->mpo_check_pipe_read =
722 mpe->mpe_function;
723 break;
724 case MAC_CHECK_PIPE_RELABEL:
725 mpc->mpc_ops->mpo_check_pipe_relabel =
726 mpe->mpe_function;
727 break;
728 case MAC_CHECK_PIPE_STAT:
729 mpc->mpc_ops->mpo_check_pipe_stat =
730 mpe->mpe_function;
731 break;
732 case MAC_CHECK_PIPE_WRITE:
733 mpc->mpc_ops->mpo_check_pipe_write =
734 mpe->mpe_function;
735 break;
736 case MAC_CHECK_PROC_DEBUG:
737 mpc->mpc_ops->mpo_check_proc_debug =
738 mpe->mpe_function;
739 break;
740 case MAC_CHECK_PROC_SCHED:
741 mpc->mpc_ops->mpo_check_proc_sched =
742 mpe->mpe_function;
743 break;
744 case MAC_CHECK_PROC_SIGNAL:
745 mpc->mpc_ops->mpo_check_proc_signal =
746 mpe->mpe_function;
747 break;
748 case MAC_CHECK_SOCKET_BIND:
749 mpc->mpc_ops->mpo_check_socket_bind =
750 mpe->mpe_function;
751 break;
752 case MAC_CHECK_SOCKET_CONNECT:
753 mpc->mpc_ops->mpo_check_socket_connect =
754 mpe->mpe_function;
755 break;
756 case MAC_CHECK_SOCKET_DELIVER:
757 mpc->mpc_ops->mpo_check_socket_deliver =
758 mpe->mpe_function;
759 break;
760 case MAC_CHECK_SOCKET_LISTEN:
761 mpc->mpc_ops->mpo_check_socket_listen =
762 mpe->mpe_function;
763 break;
764 case MAC_CHECK_SOCKET_RELABEL:
765 mpc->mpc_ops->mpo_check_socket_relabel =
766 mpe->mpe_function;
767 break;
768 case MAC_CHECK_SOCKET_VISIBLE:
769 mpc->mpc_ops->mpo_check_socket_visible =
770 mpe->mpe_function;
771 break;
772 case MAC_CHECK_VNODE_ACCESS:
773 mpc->mpc_ops->mpo_check_vnode_access =
774 mpe->mpe_function;
775 break;
776 case MAC_CHECK_VNODE_CHDIR:
777 mpc->mpc_ops->mpo_check_vnode_chdir =
778 mpe->mpe_function;
779 break;
780 case MAC_CHECK_VNODE_CHROOT:
781 mpc->mpc_ops->mpo_check_vnode_chroot =
782 mpe->mpe_function;
783 break;
784 case MAC_CHECK_VNODE_CREATE:
785 mpc->mpc_ops->mpo_check_vnode_create =
786 mpe->mpe_function;
787 break;
788 case MAC_CHECK_VNODE_DELETE:
789 mpc->mpc_ops->mpo_check_vnode_delete =
790 mpe->mpe_function;
791 break;
792 case MAC_CHECK_VNODE_DELETEACL:
793 mpc->mpc_ops->mpo_check_vnode_deleteacl =
794 mpe->mpe_function;
795 break;
796 case MAC_CHECK_VNODE_EXEC:
797 mpc->mpc_ops->mpo_check_vnode_exec =
798 mpe->mpe_function;
799 break;
800 case MAC_CHECK_VNODE_GETACL:
801 mpc->mpc_ops->mpo_check_vnode_getacl =
802 mpe->mpe_function;
803 break;
804 case MAC_CHECK_VNODE_GETEXTATTR:
805 mpc->mpc_ops->mpo_check_vnode_getextattr =
806 mpe->mpe_function;
807 break;
808 case MAC_CHECK_VNODE_LINK:
809 mpc->mpc_ops->mpo_check_vnode_link =
810 mpe->mpe_function;
811 break;
812 case MAC_CHECK_VNODE_LOOKUP:
813 mpc->mpc_ops->mpo_check_vnode_lookup =
814 mpe->mpe_function;
815 break;
816 case MAC_CHECK_VNODE_MMAP_PERMS:
817 mpc->mpc_ops->mpo_check_vnode_mmap_perms =
818 mpe->mpe_function;
819 break;
820 case MAC_CHECK_VNODE_OPEN:
821 mpc->mpc_ops->mpo_check_vnode_open =
822 mpe->mpe_function;
823 break;
824 case MAC_CHECK_VNODE_POLL:
825 mpc->mpc_ops->mpo_check_vnode_poll =
826 mpe->mpe_function;
827 break;
828 case MAC_CHECK_VNODE_READ:
829 mpc->mpc_ops->mpo_check_vnode_read =
830 mpe->mpe_function;
831 break;
832 case MAC_CHECK_VNODE_READDIR:
833 mpc->mpc_ops->mpo_check_vnode_readdir =
834 mpe->mpe_function;
835 break;
836 case MAC_CHECK_VNODE_READLINK:
837 mpc->mpc_ops->mpo_check_vnode_readlink =
838 mpe->mpe_function;
839 break;
840 case MAC_CHECK_VNODE_RELABEL:
841 mpc->mpc_ops->mpo_check_vnode_relabel =
842 mpe->mpe_function;
843 break;
844 case MAC_CHECK_VNODE_RENAME_FROM:
845 mpc->mpc_ops->mpo_check_vnode_rename_from =
846 mpe->mpe_function;
847 break;
848 case MAC_CHECK_VNODE_RENAME_TO:
849 mpc->mpc_ops->mpo_check_vnode_rename_to =
850 mpe->mpe_function;
851 break;
852 case MAC_CHECK_VNODE_REVOKE:
853 mpc->mpc_ops->mpo_check_vnode_revoke =
854 mpe->mpe_function;
855 break;
856 case MAC_CHECK_VNODE_SETACL:
857 mpc->mpc_ops->mpo_check_vnode_setacl =
858 mpe->mpe_function;
859 break;
860 case MAC_CHECK_VNODE_SETEXTATTR:
861 mpc->mpc_ops->mpo_check_vnode_setextattr =
862 mpe->mpe_function;
863 break;
864 case MAC_CHECK_VNODE_SETFLAGS:
865 mpc->mpc_ops->mpo_check_vnode_setflags =
866 mpe->mpe_function;
867 break;
868 case MAC_CHECK_VNODE_SETMODE:
869 mpc->mpc_ops->mpo_check_vnode_setmode =
870 mpe->mpe_function;
871 break;
872 case MAC_CHECK_VNODE_SETOWNER:
873 mpc->mpc_ops->mpo_check_vnode_setowner =
874 mpe->mpe_function;
875 break;
876 case MAC_CHECK_VNODE_SETUTIMES:
877 mpc->mpc_ops->mpo_check_vnode_setutimes =
878 mpe->mpe_function;
879 break;
880 case MAC_CHECK_VNODE_STAT:
881 mpc->mpc_ops->mpo_check_vnode_stat =
882 mpe->mpe_function;
883 break;
884 case MAC_CHECK_VNODE_WRITE:
885 mpc->mpc_ops->mpo_check_vnode_write =
886 mpe->mpe_function;
887 break;
888/*
889 default:
890 printf("MAC policy `%s': unknown operation %d\n",
891 mpc->mpc_name, mpe->mpe_constant);
892 return (EINVAL);
893*/
894 }
895 }
896 MAC_POLICY_LIST_LOCK();
897 if (mac_policy_list_busy > 0) {
898 MAC_POLICY_LIST_UNLOCK();
899 FREE(mpc->mpc_ops, M_MACOPVEC);
900 mpc->mpc_ops = NULL;
901 return (EBUSY);
902 }
903 LIST_FOREACH(tmpc, &mac_policy_list, mpc_list) {
904 if (strcmp(tmpc->mpc_name, mpc->mpc_name) == 0) {
905 MAC_POLICY_LIST_UNLOCK();
906 FREE(mpc->mpc_ops, M_MACOPVEC);
907 mpc->mpc_ops = NULL;
908 return (EEXIST);
909 }
910 }
911 if (mpc->mpc_field_off != NULL) {
912 slot = ffs(mac_policy_offsets_free);
913 if (slot == 0) {
914 MAC_POLICY_LIST_UNLOCK();
915 FREE(mpc->mpc_ops, M_MACOPVEC);
916 mpc->mpc_ops = NULL;
917 return (ENOMEM);
918 }
919 slot--;
920 mac_policy_offsets_free &= ~(1 << slot);
921 *mpc->mpc_field_off = slot;
922 }
923 mpc->mpc_runtime_flags |= MPC_RUNTIME_FLAG_REGISTERED;
924 LIST_INSERT_HEAD(&mac_policy_list, mpc, mpc_list);
925
926 /* Per-policy initialization. */
927 if (mpc->mpc_ops->mpo_init != NULL)
928 (*(mpc->mpc_ops->mpo_init))(mpc);
929 MAC_POLICY_LIST_UNLOCK();
930
931 printf("Security policy loaded: %s (%s)\n", mpc->mpc_fullname,
932 mpc->mpc_name);
933
934 return (0);
935}
936
937static int
938mac_policy_unregister(struct mac_policy_conf *mpc)
939{
940
941 /*
942 * If we fail the load, we may get a request to unload. Check
943 * to see if we did the run-time registration, and if not,
944 * silently succeed.
945 */
946 MAC_POLICY_LIST_LOCK();
947 if ((mpc->mpc_runtime_flags & MPC_RUNTIME_FLAG_REGISTERED) == 0) {
948 MAC_POLICY_LIST_UNLOCK();
949 return (0);
950 }
951#if 0
952 /*
953 * Don't allow unloading modules with private data.
954 */
955 if (mpc->mpc_field_off != NULL) {
956 MAC_POLICY_LIST_UNLOCK();
957 return (EBUSY);
958 }
959#endif
960 /*
961 * Only allow the unload to proceed if the module is unloadable
962 * by its own definition.
963 */
964 if ((mpc->mpc_loadtime_flags & MPC_LOADTIME_FLAG_UNLOADOK) == 0) {
965 MAC_POLICY_LIST_UNLOCK();
966 return (EBUSY);
967 }
968 /*
969 * Right now, we EBUSY if the list is in use. In the future,
970 * for reliability reasons, we might want to sleep and wakeup
971 * later to try again.
972 */
973 if (mac_policy_list_busy > 0) {
974 MAC_POLICY_LIST_UNLOCK();
975 return (EBUSY);
976 }
977 if (mpc->mpc_ops->mpo_destroy != NULL)
978 (*(mpc->mpc_ops->mpo_destroy))(mpc);
979
980 LIST_REMOVE(mpc, mpc_list);
981 MAC_POLICY_LIST_UNLOCK();
982
983 FREE(mpc->mpc_ops, M_MACOPVEC);
984 mpc->mpc_ops = NULL;
985
986 printf("Security policy unload: %s (%s)\n", mpc->mpc_fullname,
987 mpc->mpc_name);
988
989 return (0);
990}
991
992/*
993 * Define an error value precedence, and given two arguments, selects the
994 * value with the higher precedence.
995 */
996static int
997error_select(int error1, int error2)
998{
999
1000 /* Certain decision-making errors take top priority. */
1001 if (error1 == EDEADLK || error2 == EDEADLK)
1002 return (EDEADLK);
1003
1004 /* Invalid arguments should be reported where possible. */
1005 if (error1 == EINVAL || error2 == EINVAL)
1006 return (EINVAL);
1007
1008 /* Precedence goes to "visibility", with both process and file. */
1009 if (error1 == ESRCH || error2 == ESRCH)
1010 return (ESRCH);
1011
1012 if (error1 == ENOENT || error2 == ENOENT)
1013 return (ENOENT);
1014
1015 /* Precedence goes to DAC/MAC protections. */
1016 if (error1 == EACCES || error2 == EACCES)
1017 return (EACCES);
1018
1019 /* Precedence goes to privilege. */
1020 if (error1 == EPERM || error2 == EPERM)
1021 return (EPERM);
1022
1023 /* Precedence goes to error over success; otherwise, arbitrary. */
1024 if (error1 != 0)
1025 return (error1);
1026 return (error2);
1027}
1028
1029static void
1030mac_init_label(struct label *label)
1031{
1032
1033 bzero(label, sizeof(*label));
1034 label->l_flags = MAC_FLAG_INITIALIZED;
1035}
1036
1037static void
1038mac_destroy_label(struct label *label)
1039{
1040
1041 KASSERT(label->l_flags & MAC_FLAG_INITIALIZED,
1042 ("destroying uninitialized label"));
1043
1044 bzero(label, sizeof(*label));
1045 /* implicit: label->l_flags &= ~MAC_FLAG_INITIALIZED; */
1046}
1047
1048static void
1049mac_init_structmac(struct mac *mac)
1050{
1051
1052 bzero(mac, sizeof(*mac));
1053 mac->m_macflags = MAC_FLAG_INITIALIZED;
1054}
1055
1056void
1057mac_init_bpfdesc(struct bpf_d *bpf_d)
1058{
1059
1060 mac_init_label(&bpf_d->bd_label);
1061 MAC_PERFORM(init_bpfdesc_label, &bpf_d->bd_label);
1062#ifdef MAC_DEBUG
1063 atomic_add_int(&nmacbpfdescs, 1);
1064#endif
1065}
1066
1067void
1068mac_init_cred(struct ucred *cr)
1069{
1070
1071 mac_init_label(&cr->cr_label);
1072 MAC_PERFORM(init_cred_label, &cr->cr_label);
1073#ifdef MAC_DEBUG
1074 atomic_add_int(&nmaccreds, 1);
1075#endif
1076}
1077
1078void
1079mac_init_devfsdirent(struct devfs_dirent *de)
1080{
1081
1082 mac_init_label(&de->de_label);
1083 MAC_PERFORM(init_devfsdirent_label, &de->de_label);
1084#ifdef MAC_DEBUG
1085 atomic_add_int(&nmacdevfsdirents, 1);
1086#endif
1087}
1088
1089void
1090mac_init_ifnet(struct ifnet *ifp)
1091{
1092
1093 mac_init_label(&ifp->if_label);
1094 MAC_PERFORM(init_ifnet_label, &ifp->if_label);
1095#ifdef MAC_DEBUG
1096 atomic_add_int(&nmacifnets, 1);
1097#endif
1098}
1099
1100void
1101mac_init_ipq(struct ipq *ipq)
1102{
1103
1104 mac_init_label(&ipq->ipq_label);
1105 MAC_PERFORM(init_ipq_label, &ipq->ipq_label);
1106#ifdef MAC_DEBUG
1107 atomic_add_int(&nmacipqs, 1);
1108#endif
1109}
1110
1111int
1112mac_init_mbuf(struct mbuf *m, int flag)
1113{
1114 int error;
1115
1116 KASSERT(m->m_flags & M_PKTHDR, ("mac_init_mbuf on non-header mbuf"));
1117
1118 mac_init_label(&m->m_pkthdr.label);
1119
1120 MAC_CHECK(init_mbuf_label, &m->m_pkthdr.label, flag);
1121 if (error) {
1122 MAC_PERFORM(destroy_mbuf_label, &m->m_pkthdr.label);
1123 mac_destroy_label(&m->m_pkthdr.label);
1124 }
1125
1126#ifdef MAC_DEBUG
1127 if (error == 0)
1128 atomic_add_int(&nmacmbufs, 1);
1129#endif
1130 return (error);
1131}
1132
1133void
1134mac_init_mount(struct mount *mp)
1135{
1136
1137 mac_init_label(&mp->mnt_mntlabel);
1138 mac_init_label(&mp->mnt_fslabel);
1139 MAC_PERFORM(init_mount_label, &mp->mnt_mntlabel);
1140 MAC_PERFORM(init_mount_fs_label, &mp->mnt_fslabel);
1141#ifdef MAC_DEBUG
1142 atomic_add_int(&nmacmounts, 1);
1143#endif
1144}
1145
1146void
1147mac_init_pipe(struct pipe *pipe)
1148{
1149 struct label *label;
1150
1151 label = malloc(sizeof(struct label), M_MACPIPELABEL, M_ZERO|M_WAITOK);
1152 mac_init_label(label);
1153 pipe->pipe_label = label;
1154 pipe->pipe_peer->pipe_label = label;
1155 MAC_PERFORM(init_pipe_label, pipe->pipe_label);
1156#ifdef MAC_DEBUG
1157 atomic_add_int(&nmacpipes, 1);
1158#endif
1159}
1160

~~1159~~void
~~1160~~mac_init_socket(struct socket *socket)

1161static int
1162mac_init_socket_label(struct label *label, int flag)

1163{

1164 int error;

1165

~~1163~~ mac_init_label(&socket->so_label);
~~1164~~ mac_init_label(&socket->so_peerlabel);
~~1165~~ MAC_PERFORM(init_socket_label, &socket->so_label);
~~1166~~ MAC_PERFORM(init_socket_peer_label, &socket->so_peerlabel);

1166 mac_init_label(label);
1167
1168 MAC_CHECK(init_socket_label, label, flag);
1169 if (error) {
1170 MAC_PERFORM(destroy_socket_label, label);
1171 mac_destroy_label(label);
1172 }
1173

1174#ifdef MAC_DEBUG

~~1168~~ atomic_add_int(&nmacsockets, 1);

1175 if (error == 0)
1176 atomic_add_int(&nmacsockets, 1);

1177#endif

1178
1179 return (error);

1180}
1181

1182static int
1183mac_init_socket_peer_label(struct label *label, int flag)
1184{
1185 int error;
1186
1187 mac_init_label(label);
1188
1189 MAC_CHECK(init_socket_peer_label, label, flag);
1190 if (error) {
1191 MAC_PERFORM(destroy_socket_label, label);
1192 mac_destroy_label(label);
1193 }
1194
1195 return (error);
1196}
1197
1198int
1199mac_init_socket(struct socket *socket, int flag)
1200{
1201 int error;
1202
1203 error = mac_init_socket_label(&socket->so_label, flag);
1204 if (error)
1205 return (error);
1206
1207 error = mac_init_socket_peer_label(&socket->so_peerlabel, flag);
1208 if (error)
1209 mac_destroy_socket_label(&socket->so_label);
1210
1211 return (error);
1212}
1213

1214static void
1215mac_init_temp(struct label *label)
1216{
1217
1218 mac_init_label(label);
1219 MAC_PERFORM(init_temp_label, label);
1220#ifdef MAC_DEBUG
1221 atomic_add_int(&nmactemp, 1);
1222#endif
1223}
1224
1225void
1226mac_init_vnode(struct vnode *vp)
1227{
1228
1229 mac_init_label(&vp->v_label);
1230 MAC_PERFORM(init_vnode_label, &vp->v_label);
1231#ifdef MAC_DEBUG
1232 atomic_add_int(&nmacvnodes, 1);
1233#endif
1234}
1235
1236void
1237mac_destroy_bpfdesc(struct bpf_d *bpf_d)
1238{
1239
1240 MAC_PERFORM(destroy_bpfdesc_label, &bpf_d->bd_label);
1241 mac_destroy_label(&bpf_d->bd_label);
1242#ifdef MAC_DEBUG
1243 atomic_subtract_int(&nmacbpfdescs, 1);
1244#endif
1245}
1246
1247void
1248mac_destroy_cred(struct ucred *cr)
1249{
1250
1251 MAC_PERFORM(destroy_cred_label, &cr->cr_label);
1252 mac_destroy_label(&cr->cr_label);
1253#ifdef MAC_DEBUG
1254 atomic_subtract_int(&nmaccreds, 1);
1255#endif
1256}
1257
1258void
1259mac_destroy_devfsdirent(struct devfs_dirent *de)
1260{
1261
1262 MAC_PERFORM(destroy_devfsdirent_label, &de->de_label);
1263 mac_destroy_label(&de->de_label);
1264#ifdef MAC_DEBUG
1265 atomic_subtract_int(&nmacdevfsdirents, 1);
1266#endif
1267}
1268
1269void
1270mac_destroy_ifnet(struct ifnet *ifp)
1271{
1272
1273 MAC_PERFORM(destroy_ifnet_label, &ifp->if_label);
1274 mac_destroy_label(&ifp->if_label);
1275#ifdef MAC_DEBUG
1276 atomic_subtract_int(&nmacifnets, 1);
1277#endif
1278}
1279
1280void
1281mac_destroy_ipq(struct ipq *ipq)
1282{
1283
1284 MAC_PERFORM(destroy_ipq_label, &ipq->ipq_label);
1285 mac_destroy_label(&ipq->ipq_label);
1286#ifdef MAC_DEBUG
1287 atomic_subtract_int(&nmacipqs, 1);
1288#endif
1289}
1290
1291void
1292mac_destroy_mbuf(struct mbuf *m)
1293{
1294
1295 MAC_PERFORM(destroy_mbuf_label, &m->m_pkthdr.label);
1296 mac_destroy_label(&m->m_pkthdr.label);
1297#ifdef MAC_DEBUG
1298 atomic_subtract_int(&nmacmbufs, 1);
1299#endif
1300}
1301
1302void
1303mac_destroy_mount(struct mount *mp)
1304{
1305
1306 MAC_PERFORM(destroy_mount_label, &mp->mnt_mntlabel);
1307 MAC_PERFORM(destroy_mount_fs_label, &mp->mnt_fslabel);
1308 mac_destroy_label(&mp->mnt_fslabel);
1309 mac_destroy_label(&mp->mnt_mntlabel);
1310#ifdef MAC_DEBUG
1311 atomic_subtract_int(&nmacmounts, 1);
1312#endif
1313}
1314
1315void
1316mac_destroy_pipe(struct pipe *pipe)
1317{
1318
1319 MAC_PERFORM(destroy_pipe_label, pipe->pipe_label);
1320 mac_destroy_label(pipe->pipe_label);
1321 free(pipe->pipe_label, M_MACPIPELABEL);
1322#ifdef MAC_DEBUG
1323 atomic_subtract_int(&nmacpipes, 1);
1324#endif
1325}
1326

~~1285~~void
~~1286~~mac_destroy_socket(struct socket *socket)

1327static void
1328mac_destroy_socket_label(struct label *label)

1329{
1330

~~1289~~ MAC_PERFORM(destroy_socket_label, &socket->so_label);
~~1290~~ MAC_PERFORM(destroy_socket_peer_label, &socket->so_peerlabel);
~~1291~~ mac_destroy_label(&socket->so_label);
~~1292~~ mac_destroy_label(&socket->so_peerlabel);

1331 MAC_PERFORM(destroy_socket_label, label);
1332 mac_destroy_label(label);

1333#ifdef MAC_DEBUG
1334 atomic_subtract_int(&nmacsockets, 1);
1335#endif
1336}
1337
1338static void

1339mac_destroy_socket_peer_label(struct label *label)
1340{
1341
1342 MAC_PERFORM(destroy_socket_peer_label, label);
1343 mac_destroy_label(label);
1344}
1345
1346void
1347mac_destroy_socket(struct socket *socket)
1348{
1349
1350 mac_destroy_socket_label(&socket->so_label);
1351 mac_destroy_socket_peer_label(&socket->so_peerlabel);
1352}
1353
1354static void

1355mac_destroy_temp(struct label *label)
1356{
1357
1358 MAC_PERFORM(destroy_temp_label, label);
1359 mac_destroy_label(label);
1360#ifdef MAC_DEBUG
1361 atomic_subtract_int(&nmactemp, 1);
1362#endif
1363}
1364
1365void
1366mac_destroy_vnode(struct vnode *vp)
1367{
1368
1369 MAC_PERFORM(destroy_vnode_label, &vp->v_label);
1370 mac_destroy_label(&vp->v_label);
1371#ifdef MAC_DEBUG
1372 atomic_subtract_int(&nmacvnodes, 1);
1373#endif
1374}
1375
1376static int
1377mac_externalize(struct label *label, struct mac *mac)
1378{
1379 int error;
1380
1381 mac_init_structmac(mac);
1382 MAC_CHECK(externalize, label, mac);
1383
1384 return (error);
1385}
1386
1387static int
1388mac_internalize(struct label *label, struct mac *mac)
1389{
1390 int error;
1391
1392 mac_init_temp(label);
1393 MAC_CHECK(internalize, label, mac);
1394 if (error)
1395 mac_destroy_temp(label);
1396
1397 return (error);
1398}
1399
1400/*
1401 * Initialize MAC label for the first kernel process, from which other
1402 * kernel processes and threads are spawned.
1403 */
1404void
1405mac_create_proc0(struct ucred *cred)
1406{
1407
1408 MAC_PERFORM(create_proc0, cred);
1409}
1410
1411/*
1412 * Initialize MAC label for the first userland process, from which other
1413 * userland processes and threads are spawned.
1414 */
1415void
1416mac_create_proc1(struct ucred *cred)
1417{
1418
1419 MAC_PERFORM(create_proc1, cred);
1420}
1421
1422void
1423mac_thread_userret(struct thread *td)
1424{
1425
1426 MAC_PERFORM(thread_userret, td);
1427}
1428
1429/*
1430 * When a new process is created, its label must be initialized. Generally,
1431 * this involves inheritence from the parent process, modulo possible
1432 * deltas. This function allows that processing to take place.
1433 */
1434void
1435mac_create_cred(struct ucred *parent_cred, struct ucred *child_cred)
1436{
1437
1438 MAC_PERFORM(create_cred, parent_cred, child_cred);
1439}
1440
1441void
1442mac_update_devfsdirent(struct devfs_dirent *de, struct vnode *vp)
1443{
1444
1445 MAC_PERFORM(update_devfsdirent, de, &de->de_label, vp, &vp->v_label);
1446}
1447
1448void
1449mac_update_procfsvnode(struct vnode *vp, struct ucred *cred)
1450{
1451
1452 MAC_PERFORM(update_procfsvnode, vp, &vp->v_label, cred);
1453}
1454
1455/*
1456 * Support callout for policies that manage their own externalization
1457 * using extended attributes.
1458 */
1459static int
1460mac_update_vnode_from_extattr(struct vnode *vp, struct mount *mp)
1461{
1462 int error;
1463
1464 MAC_CHECK(update_vnode_from_extattr, vp, &vp->v_label, mp,
1465 &mp->mnt_fslabel);
1466
1467 return (error);
1468}
1469
1470/*
1471 * Given an externalized mac label, internalize it and stamp it on a
1472 * vnode.
1473 */
1474static int
1475mac_update_vnode_from_externalized(struct vnode *vp, struct mac *extmac)
1476{
1477 int error;
1478
1479 MAC_CHECK(update_vnode_from_externalized, vp, &vp->v_label, extmac);
1480
1481 return (error);
1482}
1483
1484/*
1485 * Call out to individual policies to update the label in a vnode from
1486 * the mountpoint.
1487 */
1488void
1489mac_update_vnode_from_mount(struct vnode *vp, struct mount *mp)
1490{
1491
1492 MAC_PERFORM(update_vnode_from_mount, vp, &vp->v_label, mp,
1493 &mp->mnt_fslabel);
1494
1495 ASSERT_VOP_LOCKED(vp, "mac_update_vnode_from_mount");
1496 if (mac_cache_fslabel_in_vnode)
1497 vp->v_vflag |= VV_CACHEDLABEL;
1498}
1499
1500/*
1501 * Implementation of VOP_REFRESHLABEL() that relies on extended attributes
1502 * to store label data. Can be referenced by filesystems supporting
1503 * extended attributes.
1504 */
1505int
1506vop_stdrefreshlabel_ea(struct vop_refreshlabel_args *ap)
1507{
1508 struct vnode *vp = ap->a_vp;
1509 struct mac extmac;
1510 int buflen, error;
1511
1512 ASSERT_VOP_LOCKED(vp, "vop_stdrefreshlabel_ea");
1513
1514 /*
1515 * Call out to external policies first. Order doesn't really
1516 * matter, as long as failure of one assures failure of all.
1517 */
1518 error = mac_update_vnode_from_extattr(vp, vp->v_mount);
1519 if (error)
1520 return (error);
1521
1522 buflen = sizeof(extmac);
1523 error = vn_extattr_get(vp, IO_NODELOCKED,
1524 FREEBSD_MAC_EXTATTR_NAMESPACE, FREEBSD_MAC_EXTATTR_NAME, &buflen,
1525 (char *)&extmac, curthread);
1526 switch (error) {
1527 case 0:
1528 /* Got it */
1529 break;
1530
1531 case ENOATTR:
1532 /*
1533 * Use the label from the mount point.
1534 */
1535 mac_update_vnode_from_mount(vp, vp->v_mount);
1536 return (0);
1537
1538 case EOPNOTSUPP:
1539 default:
1540 /* Fail horribly. */
1541 return (error);
1542 }
1543
1544 if (buflen != sizeof(extmac))
1545 error = EPERM; /* Fail very closed. */
1546 if (error == 0)
1547 error = mac_update_vnode_from_externalized(vp, &extmac);
1548 if (error == 0)
1549 vp->v_vflag |= VV_CACHEDLABEL;
1550 else {
1551 struct vattr va;
1552
1553 printf("Corrupted label on %s",
1554 vp->v_mount->mnt_stat.f_mntonname);
1555 if (VOP_GETATTR(vp, &va, curthread->td_ucred, curthread) == 0)
1556 printf(" inum %ld", va.va_fileid);
1557#ifdef MAC_DEBUG
1558 if (mac_debug_label_fallback) {
1559 printf(", falling back.\n");
1560 mac_update_vnode_from_mount(vp, vp->v_mount);
1561 error = 0;
1562 } else {
1563#endif
1564 printf(".\n");
1565 error = EPERM;
1566#ifdef MAC_DEBUG
1567 }
1568#endif
1569 }
1570
1571 return (error);
1572}
1573
1574/*
1575 * Make sure the vnode label is up-to-date. If EOPNOTSUPP, then we handle
1576 * the labeling activity outselves. Filesystems should be careful not
1577 * to change their minds regarding whether they support vop_refreshlabel()
1578 * for a vnode or not. Don't cache the vnode here, allow the file
1579 * system code to determine if it's safe to cache. If we update from
1580 * the mount, don't cache since a change to the mount label should affect
1581 * all vnodes.
1582 */
1583static int
1584vn_refreshlabel(struct vnode *vp, struct ucred *cred)
1585{
1586 int error;
1587
1588 ASSERT_VOP_LOCKED(vp, "vn_refreshlabel");
1589
1590 if (vp->v_mount == NULL) {
1591/*
1592 Eventually, we probably want to special-case refreshing
1593 of deadfs vnodes, and if there's a lock-free race somewhere,
1594 that case might be handled here.
1595
1596 mac_update_vnode_deadfs(vp);
1597 return (0);
1598 */
1599 /* printf("vn_refreshlabel: null v_mount\n"); */
1600 if (vp->v_type != VNON)
1601 printf(
1602 "vn_refreshlabel: null v_mount with non-VNON\n");
1603 return (EBADF);
1604 }
1605
1606 if (vp->v_vflag & VV_CACHEDLABEL) {
1607 mac_vnode_label_cache_hits++;
1608 return (0);
1609 } else
1610 mac_vnode_label_cache_misses++;
1611
1612 if ((vp->v_mount->mnt_flag & MNT_MULTILABEL) == 0) {
1613 mac_update_vnode_from_mount(vp, vp->v_mount);
1614 return (0);
1615 }
1616
1617 error = VOP_REFRESHLABEL(vp, cred, curthread);
1618 switch (error) {
1619 case EOPNOTSUPP:
1620 /*
1621 * If labels are not supported on this vnode, fall back to
1622 * the label in the mount and propagate it to the vnode.
1623 * There should probably be some sort of policy/flag/decision
1624 * about doing this.
1625 */
1626 mac_update_vnode_from_mount(vp, vp->v_mount);
1627 error = 0;
1628 default:
1629 return (error);
1630 }
1631}
1632
1633/*
1634 * Helper function for file systems using the vop_std*_ea() calls. This
1635 * function must be called after EA service is available for the vnode,
1636 * but before it's hooked up to the namespace so that the node persists
1637 * if there's a crash, or before it can be accessed. On successful
1638 * commit of the label to disk (etc), do cache the label.
1639 */
1640int
1641vop_stdcreatevnode_ea(struct vnode *dvp, struct vnode *tvp, struct ucred *cred)
1642{
1643 struct mac extmac;
1644 int error;
1645
1646 ASSERT_VOP_LOCKED(tvp, "vop_stdcreatevnode_ea");
1647 if ((dvp->v_mount->mnt_flag & MNT_MULTILABEL) == 0) {
1648 mac_update_vnode_from_mount(tvp, tvp->v_mount);
1649 } else {
1650 error = vn_refreshlabel(dvp, cred);
1651 if (error)
1652 return (error);
1653
1654 /*
1655 * Stick the label in the vnode. Then try to write to
1656 * disk. If we fail, return a failure to abort the
1657 * create operation. Really, this failure shouldn't
1658 * happen except in fairly unusual circumstances (out
1659 * of disk, etc).
1660 */
1661 mac_create_vnode(cred, dvp, tvp);
1662
1663 error = mac_stdcreatevnode_ea(tvp);
1664 if (error)
1665 return (error);
1666
1667 /*
1668 * XXX: Eventually this will go away and all policies will
1669 * directly manage their extended attributes.
1670 */
1671 error = mac_externalize(&tvp->v_label, &extmac);
1672 if (error)
1673 return (error);
1674
1675 error = vn_extattr_set(tvp, IO_NODELOCKED,
1676 FREEBSD_MAC_EXTATTR_NAMESPACE, FREEBSD_MAC_EXTATTR_NAME,
1677 sizeof(extmac), (char *)&extmac, curthread);
1678 if (error == 0)
1679 tvp->v_vflag |= VV_CACHEDLABEL;
1680 else {
1681#if 0
1682 /*
1683 * In theory, we could have fall-back behavior here.
1684 * It would probably be incorrect.
1685 */
1686#endif
1687 return (error);
1688 }
1689 }
1690
1691 return (0);
1692}
1693
1694void
1695mac_execve_transition(struct ucred *old, struct ucred *new, struct vnode *vp)
1696{
1697 int error;
1698
1699 ASSERT_VOP_LOCKED(vp, "mac_execve_transition");
1700
1701 error = vn_refreshlabel(vp, old);
1702 if (error) {
1703 printf("mac_execve_transition: vn_refreshlabel returned %d\n",
1704 error);
1705 printf("mac_execve_transition: using old vnode label\n");
1706 }
1707
1708 MAC_PERFORM(execve_transition, old, new, vp, &vp->v_label);
1709}
1710
1711int
1712mac_execve_will_transition(struct ucred *old, struct vnode *vp)
1713{
1714 int error, result;
1715
1716 error = vn_refreshlabel(vp, old);
1717 if (error)
1718 return (error);
1719
1720 result = 0;
1721 MAC_BOOLEAN(execve_will_transition, ||, old, vp, &vp->v_label);
1722
1723 return (result);
1724}
1725
1726int
1727mac_check_vnode_access(struct ucred *cred, struct vnode *vp, int flags)
1728{
1729 int error;
1730
1731 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_access");
1732
1733 if (!mac_enforce_fs)
1734 return (0);
1735
1736 error = vn_refreshlabel(vp, cred);
1737 if (error)
1738 return (error);
1739
1740 MAC_CHECK(check_vnode_access, cred, vp, &vp->v_label, flags);
1741 return (error);
1742}
1743
1744int
1745mac_check_vnode_chdir(struct ucred *cred, struct vnode *dvp)
1746{
1747 int error;
1748
1749 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_chdir");
1750
1751 if (!mac_enforce_fs)
1752 return (0);
1753
1754 error = vn_refreshlabel(dvp, cred);
1755 if (error)
1756 return (error);
1757
1758 MAC_CHECK(check_vnode_chdir, cred, dvp, &dvp->v_label);
1759 return (error);
1760}
1761
1762int
1763mac_check_vnode_chroot(struct ucred *cred, struct vnode *dvp)
1764{
1765 int error;
1766
1767 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_chroot");
1768
1769 if (!mac_enforce_fs)
1770 return (0);
1771
1772 error = vn_refreshlabel(dvp, cred);
1773 if (error)
1774 return (error);
1775
1776 MAC_CHECK(check_vnode_chroot, cred, dvp, &dvp->v_label);
1777 return (error);
1778}
1779
1780int
1781mac_check_vnode_create(struct ucred *cred, struct vnode *dvp,
1782 struct componentname *cnp, struct vattr *vap)
1783{
1784 int error;
1785
1786 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_create");
1787
1788 if (!mac_enforce_fs)
1789 return (0);
1790
1791 error = vn_refreshlabel(dvp, cred);
1792 if (error)
1793 return (error);
1794
1795 MAC_CHECK(check_vnode_create, cred, dvp, &dvp->v_label, cnp, vap);
1796 return (error);
1797}
1798
1799int
1800mac_check_vnode_delete(struct ucred *cred, struct vnode *dvp, struct vnode *vp,
1801 struct componentname *cnp)
1802{
1803 int error;
1804
1805 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_delete");
1806 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_delete");
1807
1808 if (!mac_enforce_fs)
1809 return (0);
1810
1811 error = vn_refreshlabel(dvp, cred);
1812 if (error)
1813 return (error);
1814 error = vn_refreshlabel(vp, cred);
1815 if (error)
1816 return (error);
1817
1818 MAC_CHECK(check_vnode_delete, cred, dvp, &dvp->v_label, vp,
1819 &vp->v_label, cnp);
1820 return (error);
1821}
1822
1823int
1824mac_check_vnode_deleteacl(struct ucred *cred, struct vnode *vp,
1825 acl_type_t type)
1826{
1827 int error;
1828
1829 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_deleteacl");
1830
1831 if (!mac_enforce_fs)
1832 return (0);
1833
1834 error = vn_refreshlabel(vp, cred);
1835 if (error)
1836 return (error);
1837
1838 MAC_CHECK(check_vnode_deleteacl, cred, vp, &vp->v_label, type);
1839 return (error);
1840}
1841
1842int
1843mac_check_vnode_exec(struct ucred *cred, struct vnode *vp)
1844{
1845 int error;
1846
1847 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_exec");
1848
1849 if (!mac_enforce_process && !mac_enforce_fs)
1850 return (0);
1851
1852 error = vn_refreshlabel(vp, cred);
1853 if (error)
1854 return (error);
1855 MAC_CHECK(check_vnode_exec, cred, vp, &vp->v_label);
1856
1857 return (error);
1858}
1859
1860int
1861mac_check_vnode_getacl(struct ucred *cred, struct vnode *vp, acl_type_t type)
1862{
1863 int error;
1864
1865 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_getacl");
1866
1867 if (!mac_enforce_fs)
1868 return (0);
1869
1870 error = vn_refreshlabel(vp, cred);
1871 if (error)
1872 return (error);
1873
1874 MAC_CHECK(check_vnode_getacl, cred, vp, &vp->v_label, type);
1875 return (error);
1876}
1877
1878int
1879mac_check_vnode_getextattr(struct ucred *cred, struct vnode *vp,
1880 int attrnamespace, const char *name, struct uio *uio)
1881{
1882 int error;
1883
1884 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_getextattr");
1885
1886 if (!mac_enforce_fs)
1887 return (0);
1888
1889 error = vn_refreshlabel(vp, cred);
1890 if (error)
1891 return (error);
1892
1893 MAC_CHECK(check_vnode_getextattr, cred, vp, &vp->v_label,
1894 attrnamespace, name, uio);
1895 return (error);
1896}
1897
1898int
1899mac_check_vnode_link(struct ucred *cred, struct vnode *dvp,
1900 struct vnode *vp, struct componentname *cnp)
1901{
1902
1903 int error;
1904
1905 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_link");
1906 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_link");
1907
1908 if (!mac_enforce_fs)
1909 return (0);
1910
1911 error = vn_refreshlabel(dvp, cred);
1912 if (error)
1913 return (error);
1914
1915 error = vn_refreshlabel(vp, cred);
1916 if (error)
1917 return (error);
1918
1919 MAC_CHECK(check_vnode_link, cred, dvp, &dvp->v_label, vp,
1920 &vp->v_label, cnp);
1921 return (error);
1922}
1923
1924int
1925mac_check_vnode_lookup(struct ucred *cred, struct vnode *dvp,
1926 struct componentname *cnp)
1927{
1928 int error;
1929
1930 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_lookup");
1931
1932 if (!mac_enforce_fs)
1933 return (0);
1934
1935 error = vn_refreshlabel(dvp, cred);
1936 if (error)
1937 return (error);
1938
1939 MAC_CHECK(check_vnode_lookup, cred, dvp, &dvp->v_label, cnp);
1940 return (error);
1941}
1942
1943vm_prot_t
1944mac_check_vnode_mmap_prot(struct ucred *cred, struct vnode *vp, int newmapping)
1945{
1946 vm_prot_t result = VM_PROT_ALL;
1947
1948 if (!mac_enforce_vm)
1949 return (result);
1950
1951 /*
1952 * This should be some sort of MAC_BITWISE, maybe :)
1953 */
1954 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mmap_perms");
1955 MAC_BOOLEAN(check_vnode_mmap_perms, &, cred, vp, &vp->v_label,
1956 newmapping);
1957 return (result);
1958}
1959
1960int
1961mac_check_vnode_open(struct ucred *cred, struct vnode *vp, mode_t acc_mode)
1962{
1963 int error;
1964
1965 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_open");
1966
1967 if (!mac_enforce_fs)
1968 return (0);
1969
1970 error = vn_refreshlabel(vp, cred);
1971 if (error)
1972 return (error);
1973
1974 MAC_CHECK(check_vnode_open, cred, vp, &vp->v_label, acc_mode);
1975 return (error);
1976}
1977
1978int
1979mac_check_vnode_poll(struct ucred *active_cred, struct ucred *file_cred,
1980 struct vnode *vp)
1981{
1982 int error;
1983
1984 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_poll");
1985
1986 if (!mac_enforce_fs)
1987 return (0);
1988
1989 error = vn_refreshlabel(vp, active_cred);
1990 if (error)
1991 return (error);
1992
1993 MAC_CHECK(check_vnode_poll, active_cred, file_cred, vp,
1994 &vp->v_label);
1995
1996 return (error);
1997}
1998
1999int
2000mac_check_vnode_read(struct ucred *active_cred, struct ucred *file_cred,
2001 struct vnode *vp)
2002{
2003 int error;
2004
2005 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_read");
2006
2007 if (!mac_enforce_fs)
2008 return (0);
2009
2010 error = vn_refreshlabel(vp, active_cred);
2011 if (error)
2012 return (error);
2013
2014 MAC_CHECK(check_vnode_read, active_cred, file_cred, vp,
2015 &vp->v_label);
2016
2017 return (error);
2018}
2019
2020int
2021mac_check_vnode_readdir(struct ucred *cred, struct vnode *dvp)
2022{
2023 int error;
2024
2025 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_readdir");
2026
2027 if (!mac_enforce_fs)
2028 return (0);
2029
2030 error = vn_refreshlabel(dvp, cred);
2031 if (error)
2032 return (error);
2033
2034 MAC_CHECK(check_vnode_readdir, cred, dvp, &dvp->v_label);
2035 return (error);
2036}
2037
2038int
2039mac_check_vnode_readlink(struct ucred *cred, struct vnode *vp)
2040{
2041 int error;
2042
2043 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_readlink");
2044
2045 if (!mac_enforce_fs)
2046 return (0);
2047
2048 error = vn_refreshlabel(vp, cred);
2049 if (error)
2050 return (error);
2051
2052 MAC_CHECK(check_vnode_readlink, cred, vp, &vp->v_label);
2053 return (error);
2054}
2055
2056static int
2057mac_check_vnode_relabel(struct ucred *cred, struct vnode *vp,
2058 struct label *newlabel)
2059{
2060 int error;
2061
2062 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_relabel");
2063
2064 error = vn_refreshlabel(vp, cred);
2065 if (error)
2066 return (error);
2067
2068 MAC_CHECK(check_vnode_relabel, cred, vp, &vp->v_label, newlabel);
2069
2070 return (error);
2071}
2072
2073int
2074mac_check_vnode_rename_from(struct ucred *cred, struct vnode *dvp,
2075 struct vnode *vp, struct componentname *cnp)
2076{
2077 int error;
2078
2079 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_rename_from");
2080 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_rename_from");
2081
2082 if (!mac_enforce_fs)
2083 return (0);
2084
2085 error = vn_refreshlabel(dvp, cred);
2086 if (error)
2087 return (error);
2088 error = vn_refreshlabel(vp, cred);
2089 if (error)
2090 return (error);
2091
2092 MAC_CHECK(check_vnode_rename_from, cred, dvp, &dvp->v_label, vp,
2093 &vp->v_label, cnp);
2094 return (error);
2095}
2096
2097int
2098mac_check_vnode_rename_to(struct ucred *cred, struct vnode *dvp,
2099 struct vnode *vp, int samedir, struct componentname *cnp)
2100{
2101 int error;
2102
2103 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_rename_to");
2104 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_rename_to");
2105
2106 if (!mac_enforce_fs)
2107 return (0);
2108
2109 error = vn_refreshlabel(dvp, cred);
2110 if (error)
2111 return (error);
2112 if (vp != NULL) {
2113 error = vn_refreshlabel(vp, cred);
2114 if (error)
2115 return (error);
2116 }
2117 MAC_CHECK(check_vnode_rename_to, cred, dvp, &dvp->v_label, vp,
2118 vp != NULL ? &vp->v_label : NULL, samedir, cnp);
2119 return (error);
2120}
2121
2122int
2123mac_check_vnode_revoke(struct ucred *cred, struct vnode *vp)
2124{
2125 int error;
2126
2127 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_revoke");
2128
2129 if (!mac_enforce_fs)
2130 return (0);
2131
2132 error = vn_refreshlabel(vp, cred);
2133 if (error)
2134 return (error);
2135
2136 MAC_CHECK(check_vnode_revoke, cred, vp, &vp->v_label);
2137 return (error);
2138}
2139
2140int
2141mac_check_vnode_setacl(struct ucred *cred, struct vnode *vp, acl_type_t type,
2142 struct acl *acl)
2143{
2144 int error;
2145
2146 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setacl");
2147
2148 if (!mac_enforce_fs)
2149 return (0);
2150
2151 error = vn_refreshlabel(vp, cred);
2152 if (error)
2153 return (error);
2154
2155 MAC_CHECK(check_vnode_setacl, cred, vp, &vp->v_label, type, acl);
2156 return (error);
2157}
2158
2159int
2160mac_check_vnode_setextattr(struct ucred *cred, struct vnode *vp,
2161 int attrnamespace, const char *name, struct uio *uio)
2162{
2163 int error;
2164
2165 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setextattr");
2166
2167 if (!mac_enforce_fs)
2168 return (0);
2169
2170 error = vn_refreshlabel(vp, cred);
2171 if (error)
2172 return (error);
2173
2174 MAC_CHECK(check_vnode_setextattr, cred, vp, &vp->v_label,
2175 attrnamespace, name, uio);
2176 return (error);
2177}
2178
2179int
2180mac_check_vnode_setflags(struct ucred *cred, struct vnode *vp, u_long flags)
2181{
2182 int error;
2183
2184 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setflags");
2185
2186 if (!mac_enforce_fs)
2187 return (0);
2188
2189 error = vn_refreshlabel(vp, cred);
2190 if (error)
2191 return (error);
2192
2193 MAC_CHECK(check_vnode_setflags, cred, vp, &vp->v_label, flags);
2194 return (error);
2195}
2196
2197int
2198mac_check_vnode_setmode(struct ucred *cred, struct vnode *vp, mode_t mode)
2199{
2200 int error;
2201
2202 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setmode");
2203
2204 if (!mac_enforce_fs)
2205 return (0);
2206
2207 error = vn_refreshlabel(vp, cred);
2208 if (error)
2209 return (error);
2210
2211 MAC_CHECK(check_vnode_setmode, cred, vp, &vp->v_label, mode);
2212 return (error);
2213}
2214
2215int
2216mac_check_vnode_setowner(struct ucred *cred, struct vnode *vp, uid_t uid,
2217 gid_t gid)
2218{
2219 int error;
2220
2221 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setowner");
2222
2223 if (!mac_enforce_fs)
2224 return (0);
2225
2226 error = vn_refreshlabel(vp, cred);
2227 if (error)
2228 return (error);
2229
2230 MAC_CHECK(check_vnode_setowner, cred, vp, &vp->v_label, uid, gid);
2231 return (error);
2232}
2233
2234int
2235mac_check_vnode_setutimes(struct ucred *cred, struct vnode *vp,
2236 struct timespec atime, struct timespec mtime)
2237{
2238 int error;
2239
2240 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setutimes");
2241
2242 if (!mac_enforce_fs)
2243 return (0);
2244
2245 error = vn_refreshlabel(vp, cred);
2246 if (error)
2247 return (error);
2248
2249 MAC_CHECK(check_vnode_setutimes, cred, vp, &vp->v_label, atime,
2250 mtime);
2251 return (error);
2252}
2253
2254int
2255mac_check_vnode_stat(struct ucred *active_cred, struct ucred *file_cred,
2256 struct vnode *vp)
2257{
2258 int error;
2259
2260 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_stat");
2261
2262 if (!mac_enforce_fs)
2263 return (0);
2264
2265 error = vn_refreshlabel(vp, active_cred);
2266 if (error)
2267 return (error);
2268
2269 MAC_CHECK(check_vnode_stat, active_cred, file_cred, vp,
2270 &vp->v_label);
2271 return (error);
2272}
2273
2274int
2275mac_check_vnode_write(struct ucred *active_cred, struct ucred *file_cred,
2276 struct vnode *vp)
2277{
2278 int error;
2279
2280 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_write");
2281
2282 if (!mac_enforce_fs)
2283 return (0);
2284
2285 error = vn_refreshlabel(vp, active_cred);
2286 if (error)
2287 return (error);
2288
2289 MAC_CHECK(check_vnode_write, active_cred, file_cred, vp,
2290 &vp->v_label);
2291
2292 return (error);
2293}
2294
2295/*
2296 * When relabeling a process, call out to the policies for the maximum
2297 * permission allowed for each object type we know about in its
2298 * memory space, and revoke access (in the least surprising ways we
2299 * know) when necessary. The process lock is not held here.
2300 */
2301static void
2302mac_cred_mmapped_drop_perms(struct thread *td, struct ucred *cred)
2303{
2304
2305 /* XXX freeze all other threads */
2306 mac_cred_mmapped_drop_perms_recurse(td, cred,
2307 &td->td_proc->p_vmspace->vm_map);
2308 /* XXX allow other threads to continue */
2309}
2310
2311static __inline const char *
2312prot2str(vm_prot_t prot)
2313{
2314
2315 switch (prot & VM_PROT_ALL) {
2316 case VM_PROT_READ:
2317 return ("r--");
2318 case VM_PROT_READ | VM_PROT_WRITE:
2319 return ("rw-");
2320 case VM_PROT_READ | VM_PROT_EXECUTE:
2321 return ("r-x");
2322 case VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE:
2323 return ("rwx");
2324 case VM_PROT_WRITE:
2325 return ("-w-");
2326 case VM_PROT_EXECUTE:
2327 return ("--x");
2328 case VM_PROT_WRITE | VM_PROT_EXECUTE:
2329 return ("-wx");
2330 default:
2331 return ("---");
2332 }
2333}
2334
2335static void
2336mac_cred_mmapped_drop_perms_recurse(struct thread *td, struct ucred *cred,
2337 struct vm_map *map)
2338{
2339 struct vm_map_entry *vme;
2340 vm_prot_t result, revokeperms;
2341 vm_object_t object;
2342 vm_ooffset_t offset;
2343 struct vnode *vp;
2344
2345 if (!mac_mmap_revocation)
2346 return;
2347
2348 vm_map_lock_read(map);
2349 for (vme = map->header.next; vme != &map->header; vme = vme->next) {
2350 if (vme->eflags & MAP_ENTRY_IS_SUB_MAP) {
2351 mac_cred_mmapped_drop_perms_recurse(td, cred,
2352 vme->object.sub_map);
2353 continue;
2354 }
2355 /*
2356 * Skip over entries that obviously are not shared.
2357 */
2358 if (vme->eflags & (MAP_ENTRY_COW | MAP_ENTRY_NOSYNC) ||
2359 !vme->max_protection)
2360 continue;
2361 /*
2362 * Drill down to the deepest backing object.
2363 */
2364 offset = vme->offset;
2365 object = vme->object.vm_object;
2366 if (object == NULL)
2367 continue;
2368 while (object->backing_object != NULL) {
2369 object = object->backing_object;
2370 offset += object->backing_object_offset;
2371 }
2372 /*
2373 * At the moment, vm_maps and objects aren't considered
2374 * by the MAC system, so only things with backing by a
2375 * normal object (read: vnodes) are checked.
2376 */
2377 if (object->type != OBJT_VNODE)
2378 continue;
2379 vp = (struct vnode *)object->handle;
2380 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
2381 result = mac_check_vnode_mmap_prot(cred, vp, 0);
2382 VOP_UNLOCK(vp, 0, td);
2383 /*
2384 * Find out what maximum protection we may be allowing
2385 * now but a policy needs to get removed.
2386 */
2387 revokeperms = vme->max_protection & ~result;
2388 if (!revokeperms)
2389 continue;
2390 printf("pid %ld: revoking %s perms from %#lx:%ld "
2391 "(max %s/cur %s)\n", (long)td->td_proc->p_pid,
2392 prot2str(revokeperms), (u_long)vme->start,
2393 (long)(vme->end - vme->start),
2394 prot2str(vme->max_protection), prot2str(vme->protection));
2395 vm_map_lock_upgrade(map);
2396 /*
2397 * This is the really simple case: if a map has more
2398 * max_protection than is allowed, but it's not being
2399 * actually used (that is, the current protection is
2400 * still allowed), we can just wipe it out and do
2401 * nothing more.
2402 */
2403 if ((vme->protection & revokeperms) == 0) {
2404 vme->max_protection -= revokeperms;
2405 } else {
2406 if (revokeperms & VM_PROT_WRITE) {
2407 /*
2408 * In the more complicated case, flush out all
2409 * pending changes to the object then turn it
2410 * copy-on-write.
2411 */
2412 vm_object_reference(object);
2413 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
2414 vm_object_page_clean(object,
2415 OFF_TO_IDX(offset),
2416 OFF_TO_IDX(offset + vme->end - vme->start +
2417 PAGE_MASK),
2418 OBJPC_SYNC);
2419 VOP_UNLOCK(vp, 0, td);
2420 vm_object_deallocate(object);
2421 /*
2422 * Why bother if there's no read permissions
2423 * anymore? For the rest, we need to leave
2424 * the write permissions on for COW, or
2425 * remove them entirely if configured to.
2426 */
2427 if (!mac_mmap_revocation_via_cow) {
2428 vme->max_protection &= ~VM_PROT_WRITE;
2429 vme->protection &= ~VM_PROT_WRITE;
2430 } if ((revokeperms & VM_PROT_READ) == 0)
2431 vme->eflags |= MAP_ENTRY_COW |
2432 MAP_ENTRY_NEEDS_COPY;
2433 }
2434 if (revokeperms & VM_PROT_EXECUTE) {
2435 vme->max_protection &= ~VM_PROT_EXECUTE;
2436 vme->protection &= ~VM_PROT_EXECUTE;
2437 }
2438 if (revokeperms & VM_PROT_READ) {
2439 vme->max_protection = 0;
2440 vme->protection = 0;
2441 }
2442 pmap_protect(map->pmap, vme->start, vme->end,
2443 vme->protection & ~revokeperms);
2444 vm_map_simplify_entry(map, vme);
2445 }
2446 vm_map_lock_downgrade(map);
2447 }
2448 vm_map_unlock_read(map);
2449}
2450
2451/*
2452 * When the subject's label changes, it may require revocation of privilege
2453 * to mapped objects. This can't be done on-the-fly later with a unified
2454 * buffer cache.
2455 */
2456static void
2457mac_relabel_cred(struct ucred *cred, struct label *newlabel)
2458{
2459
2460 MAC_PERFORM(relabel_cred, cred, newlabel);
2461}
2462
2463void
2464mac_relabel_vnode(struct ucred *cred, struct vnode *vp, struct label *newlabel)
2465{
2466
2467 MAC_PERFORM(relabel_vnode, cred, vp, &vp->v_label, newlabel);
2468}
2469
2470void
2471mac_create_ifnet(struct ifnet *ifnet)
2472{
2473
2474 MAC_PERFORM(create_ifnet, ifnet, &ifnet->if_label);
2475}
2476
2477void
2478mac_create_bpfdesc(struct ucred *cred, struct bpf_d *bpf_d)
2479{
2480
2481 MAC_PERFORM(create_bpfdesc, cred, bpf_d, &bpf_d->bd_label);
2482}
2483
2484void
2485mac_create_socket(struct ucred *cred, struct socket *socket)
2486{
2487
2488 MAC_PERFORM(create_socket, cred, socket, &socket->so_label);
2489}
2490
2491void
2492mac_create_pipe(struct ucred *cred, struct pipe *pipe)
2493{
2494
2495 MAC_PERFORM(create_pipe, cred, pipe, pipe->pipe_label);
2496}
2497
2498void
2499mac_create_socket_from_socket(struct socket *oldsocket,
2500 struct socket *newsocket)
2501{
2502
2503 MAC_PERFORM(create_socket_from_socket, oldsocket, &oldsocket->so_label,
2504 newsocket, &newsocket->so_label);
2505}
2506
2507static void
2508mac_relabel_socket(struct ucred *cred, struct socket *socket,
2509 struct label *newlabel)
2510{
2511
2512 MAC_PERFORM(relabel_socket, cred, socket, &socket->so_label, newlabel);
2513}
2514
2515static void
2516mac_relabel_pipe(struct ucred *cred, struct pipe *pipe, struct label *newlabel)
2517{
2518
2519 MAC_PERFORM(relabel_pipe, cred, pipe, pipe->pipe_label, newlabel);
2520}
2521
2522void
2523mac_set_socket_peer_from_mbuf(struct mbuf *mbuf, struct socket *socket)
2524{
2525
2526 MAC_PERFORM(set_socket_peer_from_mbuf, mbuf, &mbuf->m_pkthdr.label,
2527 socket, &socket->so_peerlabel);
2528}
2529
2530void
2531mac_set_socket_peer_from_socket(struct socket *oldsocket,
2532 struct socket *newsocket)
2533{
2534
2535 MAC_PERFORM(set_socket_peer_from_socket, oldsocket,
2536 &oldsocket->so_label, newsocket, &newsocket->so_peerlabel);
2537}
2538
2539void
2540mac_create_datagram_from_ipq(struct ipq *ipq, struct mbuf *datagram)
2541{
2542
2543 MAC_PERFORM(create_datagram_from_ipq, ipq, &ipq->ipq_label,
2544 datagram, &datagram->m_pkthdr.label);
2545}
2546
2547void
2548mac_create_fragment(struct mbuf *datagram, struct mbuf *fragment)
2549{
2550
2551 MAC_PERFORM(create_fragment, datagram, &datagram->m_pkthdr.label,
2552 fragment, &fragment->m_pkthdr.label);
2553}
2554
2555void
2556mac_create_ipq(struct mbuf *fragment, struct ipq *ipq)
2557{
2558
2559 MAC_PERFORM(create_ipq, fragment, &fragment->m_pkthdr.label, ipq,
2560 &ipq->ipq_label);
2561}
2562
2563void
2564mac_create_mbuf_from_mbuf(struct mbuf *oldmbuf, struct mbuf *newmbuf)
2565{
2566
2567 MAC_PERFORM(create_mbuf_from_mbuf, oldmbuf, &oldmbuf->m_pkthdr.label,
2568 newmbuf, &newmbuf->m_pkthdr.label);
2569}
2570
2571void
2572mac_create_mbuf_from_bpfdesc(struct bpf_d *bpf_d, struct mbuf *mbuf)
2573{
2574
2575 MAC_PERFORM(create_mbuf_from_bpfdesc, bpf_d, &bpf_d->bd_label, mbuf,
2576 &mbuf->m_pkthdr.label);
2577}
2578
2579void
2580mac_create_mbuf_linklayer(struct ifnet *ifnet, struct mbuf *mbuf)
2581{
2582
2583 MAC_PERFORM(create_mbuf_linklayer, ifnet, &ifnet->if_label, mbuf,
2584 &mbuf->m_pkthdr.label);
2585}
2586
2587void
2588mac_create_mbuf_from_ifnet(struct ifnet *ifnet, struct mbuf *mbuf)
2589{
2590
2591 MAC_PERFORM(create_mbuf_from_ifnet, ifnet, &ifnet->if_label, mbuf,
2592 &mbuf->m_pkthdr.label);
2593}
2594
2595void
2596mac_create_mbuf_multicast_encap(struct mbuf *oldmbuf, struct ifnet *ifnet,
2597 struct mbuf *newmbuf)
2598{
2599
2600 MAC_PERFORM(create_mbuf_multicast_encap, oldmbuf,
2601 &oldmbuf->m_pkthdr.label, ifnet, &ifnet->if_label, newmbuf,
2602 &newmbuf->m_pkthdr.label);
2603}
2604
2605void
2606mac_create_mbuf_netlayer(struct mbuf *oldmbuf, struct mbuf *newmbuf)
2607{
2608
2609 MAC_PERFORM(create_mbuf_netlayer, oldmbuf, &oldmbuf->m_pkthdr.label,
2610 newmbuf, &newmbuf->m_pkthdr.label);
2611}
2612
2613int
2614mac_fragment_match(struct mbuf *fragment, struct ipq *ipq)
2615{
2616 int result;
2617
2618 result = 1;
2619 MAC_BOOLEAN(fragment_match, &&, fragment, &fragment->m_pkthdr.label,
2620 ipq, &ipq->ipq_label);
2621
2622 return (result);
2623}
2624
2625void
2626mac_update_ipq(struct mbuf *fragment, struct ipq *ipq)
2627{
2628
2629 MAC_PERFORM(update_ipq, fragment, &fragment->m_pkthdr.label, ipq,
2630 &ipq->ipq_label);
2631}
2632
2633void
2634mac_create_mbuf_from_socket(struct socket *socket, struct mbuf *mbuf)
2635{
2636
2637 MAC_PERFORM(create_mbuf_from_socket, socket, &socket->so_label, mbuf,
2638 &mbuf->m_pkthdr.label);
2639}
2640
2641void
2642mac_create_mount(struct ucred *cred, struct mount *mp)
2643{
2644
2645 MAC_PERFORM(create_mount, cred, mp, &mp->mnt_mntlabel,
2646 &mp->mnt_fslabel);
2647}
2648
2649void
2650mac_create_root_mount(struct ucred *cred, struct mount *mp)
2651{
2652
2653 MAC_PERFORM(create_root_mount, cred, mp, &mp->mnt_mntlabel,
2654 &mp->mnt_fslabel);
2655}
2656
2657int
2658mac_check_bpfdesc_receive(struct bpf_d *bpf_d, struct ifnet *ifnet)
2659{
2660 int error;
2661
2662 if (!mac_enforce_network)
2663 return (0);
2664
2665 MAC_CHECK(check_bpfdesc_receive, bpf_d, &bpf_d->bd_label, ifnet,
2666 &ifnet->if_label);
2667
2668 return (error);
2669}
2670
2671static int
2672mac_check_cred_relabel(struct ucred *cred, struct label *newlabel)
2673{
2674 int error;
2675
2676 MAC_CHECK(check_cred_relabel, cred, newlabel);
2677
2678 return (error);
2679}
2680
2681int
2682mac_check_cred_visible(struct ucred *u1, struct ucred *u2)
2683{
2684 int error;
2685
2686 if (!mac_enforce_process)
2687 return (0);
2688
2689 MAC_CHECK(check_cred_visible, u1, u2);
2690
2691 return (error);
2692}
2693
2694int
2695mac_check_ifnet_transmit(struct ifnet *ifnet, struct mbuf *mbuf)
2696{
2697 int error;
2698
2699 if (!mac_enforce_network)
2700 return (0);
2701
2702 KASSERT(mbuf->m_flags & M_PKTHDR, ("packet has no pkthdr"));
2703 if (!(mbuf->m_pkthdr.label.l_flags & MAC_FLAG_INITIALIZED))
2704 printf("%s%d: not initialized\n", ifnet->if_name,
2705 ifnet->if_unit);
2706
2707 MAC_CHECK(check_ifnet_transmit, ifnet, &ifnet->if_label, mbuf,
2708 &mbuf->m_pkthdr.label);
2709
2710 return (error);
2711}
2712
2713int
2714mac_check_mount_stat(struct ucred *cred, struct mount *mount)
2715{
2716 int error;
2717
2718 if (!mac_enforce_fs)
2719 return (0);
2720
2721 MAC_CHECK(check_mount_stat, cred, mount, &mount->mnt_mntlabel);
2722
2723 return (error);
2724}
2725
2726int
2727mac_check_pipe_ioctl(struct ucred *cred, struct pipe *pipe, unsigned long cmd,
2728 void *data)
2729{
2730 int error;
2731
2732 PIPE_LOCK_ASSERT(pipe, MA_OWNED);
2733
2734 if (!mac_enforce_pipe)
2735 return (0);
2736
2737 MAC_CHECK(check_pipe_ioctl, cred, pipe, pipe->pipe_label, cmd, data);
2738
2739 return (error);
2740}
2741
2742int
2743mac_check_pipe_poll(struct ucred *cred, struct pipe *pipe)
2744{
2745 int error;
2746
2747 PIPE_LOCK_ASSERT(pipe, MA_OWNED);
2748
2749 if (!mac_enforce_pipe)
2750 return (0);
2751
2752 MAC_CHECK(check_pipe_poll, cred, pipe, pipe->pipe_label);
2753
2754 return (error);
2755}
2756
2757int
2758mac_check_pipe_read(struct ucred *cred, struct pipe *pipe)
2759{
2760 int error;
2761
2762 PIPE_LOCK_ASSERT(pipe, MA_OWNED);
2763
2764 if (!mac_enforce_pipe)
2765 return (0);
2766
2767 MAC_CHECK(check_pipe_read, cred, pipe, pipe->pipe_label);
2768
2769 return (error);
2770}
2771
2772static int
2773mac_check_pipe_relabel(struct ucred *cred, struct pipe *pipe,
2774 struct label *newlabel)
2775{
2776 int error;
2777
2778 PIPE_LOCK_ASSERT(pipe, MA_OWNED);
2779
2780 if (!mac_enforce_pipe)
2781 return (0);
2782
2783 MAC_CHECK(check_pipe_relabel, cred, pipe, pipe->pipe_label, newlabel);
2784
2785 return (error);
2786}
2787
2788int
2789mac_check_pipe_stat(struct ucred *cred, struct pipe *pipe)
2790{
2791 int error;
2792
2793 PIPE_LOCK_ASSERT(pipe, MA_OWNED);
2794
2795 if (!mac_enforce_pipe)
2796 return (0);
2797
2798 MAC_CHECK(check_pipe_stat, cred, pipe, pipe->pipe_label);
2799
2800 return (error);
2801}
2802
2803int
2804mac_check_pipe_write(struct ucred *cred, struct pipe *pipe)
2805{
2806 int error;
2807
2808 PIPE_LOCK_ASSERT(pipe, MA_OWNED);
2809
2810 if (!mac_enforce_pipe)
2811 return (0);
2812
2813 MAC_CHECK(check_pipe_write, cred, pipe, pipe->pipe_label);
2814
2815 return (error);
2816}
2817
2818int
2819mac_check_proc_debug(struct ucred *cred, struct proc *proc)
2820{
2821 int error;
2822
2823 PROC_LOCK_ASSERT(proc, MA_OWNED);
2824
2825 if (!mac_enforce_process)
2826 return (0);
2827
2828 MAC_CHECK(check_proc_debug, cred, proc);
2829
2830 return (error);
2831}
2832
2833int
2834mac_check_proc_sched(struct ucred *cred, struct proc *proc)
2835{
2836 int error;
2837
2838 PROC_LOCK_ASSERT(proc, MA_OWNED);
2839
2840 if (!mac_enforce_process)
2841 return (0);
2842
2843 MAC_CHECK(check_proc_sched, cred, proc);
2844
2845 return (error);
2846}
2847
2848int
2849mac_check_proc_signal(struct ucred *cred, struct proc *proc, int signum)
2850{
2851 int error;
2852
2853 PROC_LOCK_ASSERT(proc, MA_OWNED);
2854
2855 if (!mac_enforce_process)
2856 return (0);
2857
2858 MAC_CHECK(check_proc_signal, cred, proc, signum);
2859
2860 return (error);
2861}
2862
2863int
2864mac_check_socket_bind(struct ucred *ucred, struct socket *socket,
2865 struct sockaddr *sockaddr)
2866{
2867 int error;
2868
2869 if (!mac_enforce_socket)
2870 return (0);
2871
2872 MAC_CHECK(check_socket_bind, ucred, socket, &socket->so_label,
2873 sockaddr);
2874
2875 return (error);
2876}
2877
2878int
2879mac_check_socket_connect(struct ucred *cred, struct socket *socket,
2880 struct sockaddr *sockaddr)
2881{
2882 int error;
2883
2884 if (!mac_enforce_socket)
2885 return (0);
2886
2887 MAC_CHECK(check_socket_connect, cred, socket, &socket->so_label,
2888 sockaddr);
2889
2890 return (error);
2891}
2892
2893int
2894mac_check_socket_deliver(struct socket *socket, struct mbuf *mbuf)
2895{
2896 int error;
2897
2898 if (!mac_enforce_socket)
2899 return (0);
2900
2901 MAC_CHECK(check_socket_deliver, socket, &socket->so_label, mbuf,
2902 &mbuf->m_pkthdr.label);
2903
2904 return (error);
2905}
2906
2907int
2908mac_check_socket_listen(struct ucred *cred, struct socket *socket)
2909{
2910 int error;
2911
2912 if (!mac_enforce_socket)
2913 return (0);
2914
2915 MAC_CHECK(check_socket_listen, cred, socket, &socket->so_label);
2916 return (error);
2917}
2918
2919static int
2920mac_check_socket_relabel(struct ucred *cred, struct socket *socket,
2921 struct label *newlabel)
2922{
2923 int error;
2924
2925 MAC_CHECK(check_socket_relabel, cred, socket, &socket->so_label,
2926 newlabel);
2927
2928 return (error);
2929}
2930
2931int
2932mac_check_socket_visible(struct ucred *cred, struct socket *socket)
2933{
2934 int error;
2935
2936 if (!mac_enforce_socket)
2937 return (0);
2938
2939 MAC_CHECK(check_socket_visible, cred, socket, &socket->so_label);
2940
2941 return (error);
2942}
2943
2944int
2945mac_ioctl_ifnet_get(struct ucred *cred, struct ifreq *ifr,
2946 struct ifnet *ifnet)
2947{
2948 struct mac label;
2949 int error;
2950
2951 error = mac_externalize(&ifnet->if_label, &label);
2952 if (error)
2953 return (error);
2954
2955 return (copyout(&label, ifr->ifr_ifru.ifru_data, sizeof(label)));
2956}
2957
2958int
2959mac_ioctl_ifnet_set(struct ucred *cred, struct ifreq *ifr,
2960 struct ifnet *ifnet)
2961{
2962 struct mac newlabel;
2963 struct label intlabel;
2964 int error;
2965
2966 error = copyin(ifr->ifr_ifru.ifru_data, &newlabel, sizeof(newlabel));
2967 if (error)
2968 return (error);
2969
2970 error = mac_internalize(&intlabel, &newlabel);
2971 if (error)
2972 return (error);
2973
2974 /*
2975 * XXX: Note that this is a redundant privilege check, since
2976 * policies impose this check themselves if required by the
2977 * policy. Eventually, this should go away.
2978 */
2979 error = suser_cred(cred, 0);
2980 if (error)
2981 goto out;
2982
2983 MAC_CHECK(check_ifnet_relabel, cred, ifnet, &ifnet->if_label,
2984 &intlabel);
2985 if (error)
2986 goto out;
2987
2988 MAC_PERFORM(relabel_ifnet, cred, ifnet, &ifnet->if_label, &intlabel);
2989
2990out:
2991 mac_destroy_temp(&intlabel);
2992 return (error);
2993}
2994
2995void
2996mac_create_devfs_vnode(struct devfs_dirent *de, struct vnode *vp)
2997{
2998
2999 MAC_PERFORM(create_devfs_vnode, de, &de->de_label, vp, &vp->v_label);
3000}
3001
3002void
3003mac_create_devfs_device(dev_t dev, struct devfs_dirent *de)
3004{
3005
3006 MAC_PERFORM(create_devfs_device, dev, de, &de->de_label);
3007}
3008
3009void
3010mac_create_devfs_symlink(struct ucred *cred, struct devfs_dirent *dd,
3011 struct devfs_dirent *de)
3012{
3013
3014 MAC_PERFORM(create_devfs_symlink, cred, dd, &dd->de_label, de,
3015 &de->de_label);
3016}
3017
3018static int
3019mac_stdcreatevnode_ea(struct vnode *vp)
3020{
3021 int error;
3022
3023 MAC_CHECK(stdcreatevnode_ea, vp, &vp->v_label);
3024
3025 return (error);
3026}
3027
3028void
3029mac_create_devfs_directory(char *dirname, int dirnamelen,
3030 struct devfs_dirent *de)
3031{
3032
3033 MAC_PERFORM(create_devfs_directory, dirname, dirnamelen, de,
3034 &de->de_label);
3035}
3036
3037/*
3038 * When a new vnode is created, this call will initialize its label.
3039 */
3040void
3041mac_create_vnode(struct ucred *cred, struct vnode *parent,
3042 struct vnode *child)
3043{
3044 int error;
3045
3046 ASSERT_VOP_LOCKED(parent, "mac_create_vnode");
3047 ASSERT_VOP_LOCKED(child, "mac_create_vnode");
3048
3049 error = vn_refreshlabel(parent, cred);
3050 if (error) {
3051 printf("mac_create_vnode: vn_refreshlabel returned %d\n",
3052 error);
3053 printf("mac_create_vnode: using old vnode label\n");
3054 }
3055
3056 MAC_PERFORM(create_vnode, cred, parent, &parent->v_label, child,
3057 &child->v_label);
3058}
3059
3060int
3061mac_setsockopt_label_set(struct ucred *cred, struct socket *so,
3062 struct mac *extmac)
3063{
3064 struct label intlabel;
3065 int error;
3066
3067 error = mac_internalize(&intlabel, extmac);
3068 if (error)
3069 return (error);
3070
3071 mac_check_socket_relabel(cred, so, &intlabel);
3072 if (error) {
3073 mac_destroy_temp(&intlabel);
3074 return (error);
3075 }
3076
3077 mac_relabel_socket(cred, so, &intlabel);
3078
3079 mac_destroy_temp(&intlabel);
3080 return (0);
3081}
3082
3083int
3084mac_pipe_label_set(struct ucred *cred, struct pipe *pipe, struct label *label)
3085{
3086 int error;
3087
3088 PIPE_LOCK_ASSERT(pipe, MA_OWNED);
3089
3090 error = mac_check_pipe_relabel(cred, pipe, label);
3091 if (error)
3092 return (error);
3093
3094 mac_relabel_pipe(cred, pipe, label);
3095
3096 return (0);
3097}
3098
3099int
3100mac_getsockopt_label_get(struct ucred *cred, struct socket *so,
3101 struct mac *extmac)
3102{
3103
3104 return (mac_externalize(&so->so_label, extmac));
3105}
3106
3107int
3108mac_getsockopt_peerlabel_get(struct ucred *cred, struct socket *so,
3109 struct mac *extmac)
3110{
3111
3112 return (mac_externalize(&so->so_peerlabel, extmac));
3113}
3114
3115/*
3116 * Implementation of VOP_SETLABEL() that relies on extended attributes
3117 * to store label data. Can be referenced by filesystems supporting
3118 * extended attributes.
3119 */
3120int
3121vop_stdsetlabel_ea(struct vop_setlabel_args *ap)
3122{
3123 struct vnode *vp = ap->a_vp;
3124 struct label *intlabel = ap->a_label;
3125 struct mac extmac;
3126 int error;
3127
3128 ASSERT_VOP_LOCKED(vp, "vop_stdsetlabel_ea");
3129
3130 /*
3131 * XXX: Eventually call out to EA check/set calls here.
3132 * Be particularly careful to avoid race conditions,
3133 * consistency problems, and stability problems when
3134 * dealing with multiple EAs. In particular, we require
3135 * the ability to write multiple EAs on the same file in
3136 * a single transaction, which the current EA interface
3137 * does not provide.
3138 */
3139
3140 error = mac_externalize(intlabel, &extmac);
3141 if (error)
3142 return (error);
3143
3144 error = vn_extattr_set(vp, IO_NODELOCKED,
3145 FREEBSD_MAC_EXTATTR_NAMESPACE, FREEBSD_MAC_EXTATTR_NAME,
3146 sizeof(extmac), (char *)&extmac, curthread);
3147 if (error)
3148 return (error);
3149
3150 mac_relabel_vnode(ap->a_cred, vp, intlabel);
3151
3152 vp->v_vflag |= VV_CACHEDLABEL;
3153
3154 return (0);
3155}
3156
3157static int
3158vn_setlabel(struct vnode *vp, struct label *intlabel, struct ucred *cred)
3159{
3160 int error;
3161
3162 if (vp->v_mount == NULL) {
3163 /* printf("vn_setlabel: null v_mount\n"); */
3164 if (vp->v_type != VNON)
3165 printf("vn_setlabel: null v_mount with non-VNON\n");
3166 return (EBADF);
3167 }
3168
3169 if ((vp->v_mount->mnt_flag & MNT_MULTILABEL) == 0)
3170 return (EOPNOTSUPP);
3171
3172 /*
3173 * Multi-phase commit. First check the policies to confirm the
3174 * change is OK. Then commit via the filesystem. Finally,
3175 * update the actual vnode label. Question: maybe the filesystem
3176 * should update the vnode at the end as part of VOP_SETLABEL()?
3177 */
3178 error = mac_check_vnode_relabel(cred, vp, intlabel);
3179 if (error)
3180 return (error);
3181
3182 /*
3183 * VADMIN provides the opportunity for the filesystem to make
3184 * decisions about who is and is not able to modify labels
3185 * and protections on files. This might not be right. We can't
3186 * assume VOP_SETLABEL() will do it, because we might implement
3187 * that as part of vop_stdsetlabel_ea().
3188 */
3189 error = VOP_ACCESS(vp, VADMIN, cred, curthread);
3190 if (error)
3191 return (error);
3192
3193 error = VOP_SETLABEL(vp, intlabel, cred, curthread);
3194 if (error)
3195 return (error);
3196
3197 return (0);
3198}
3199
3200/*
3201 * MPSAFE
3202 */
3203int
3204__mac_get_proc(struct thread *td, struct __mac_get_proc_args *uap)
3205{
3206 struct mac extmac;
3207 int error;
3208
3209 error = mac_externalize(&td->td_ucred->cr_label, &extmac);
3210 if (error == 0)
3211 error = copyout(&extmac, SCARG(uap, mac_p), sizeof(extmac));
3212
3213 return (error);
3214}
3215
3216/*
3217 * MPSAFE
3218 */
3219int
3220__mac_set_proc(struct thread *td, struct __mac_set_proc_args *uap)
3221{
3222 struct ucred *newcred, *oldcred;
3223 struct proc *p;
3224 struct mac extmac;
3225 struct label intlabel;
3226 int error;
3227
3228 error = copyin(SCARG(uap, mac_p), &extmac, sizeof(extmac));
3229 if (error)
3230 return (error);
3231
3232 error = mac_internalize(&intlabel, &extmac);
3233 if (error)
3234 return (error);
3235
3236 newcred = crget();
3237
3238 p = td->td_proc;
3239 PROC_LOCK(p);
3240 oldcred = p->p_ucred;
3241
3242 error = mac_check_cred_relabel(oldcred, &intlabel);
3243 if (error) {
3244 PROC_UNLOCK(p);
3245 mac_destroy_temp(&intlabel);
3246 crfree(newcred);
3247 return (error);
3248 }
3249
3250 setsugid(p);
3251 crcopy(newcred, oldcred);
3252 mac_relabel_cred(newcred, &intlabel);
3253 p->p_ucred = newcred;
3254
3255 /*
3256 * Grab additional reference for use while revoking mmaps, prior
3257 * to releasing the proc lock and sharing the cred.
3258 */
3259 crhold(newcred);
3260 PROC_UNLOCK(p);
3261
3262 mtx_lock(&Giant);
3263 mac_cred_mmapped_drop_perms(td, newcred);
3264 mtx_unlock(&Giant);
3265
3266 crfree(newcred); /* Free revocation reference. */
3267 crfree(oldcred);
3268 mac_destroy_temp(&intlabel);
3269 return (0);
3270}
3271
3272/*
3273 * MPSAFE
3274 */
3275int
3276__mac_get_fd(struct thread *td, struct __mac_get_fd_args *uap)
3277{
3278 struct file *fp;
3279 struct mac extmac;
3280 struct vnode *vp;
3281 struct pipe *pipe;
3282 int error;
3283
3284 mtx_lock(&Giant);
3285
3286 error = fget(td, SCARG(uap, fd), &fp);
3287 if (error)
3288 goto out;
3289
3290 switch (fp->f_type) {
3291 case DTYPE_FIFO:
3292 case DTYPE_VNODE:
3293 vp = (struct vnode *)fp->f_data;
3294
3295 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
3296 error = vn_refreshlabel(vp, td->td_ucred);
3297 if (error == 0)
3298 error = mac_externalize(&vp->v_label, &extmac);
3299 VOP_UNLOCK(vp, 0, td);
3300 break;
3301 case DTYPE_PIPE:
3302 pipe = (struct pipe *)fp->f_data;
3303 error = mac_externalize(pipe->pipe_label, &extmac);
3304 break;
3305 default:
3306 error = EINVAL;
3307 }
3308
3309 if (error == 0)
3310 error = copyout(&extmac, SCARG(uap, mac_p), sizeof(extmac));
3311
3312 fdrop(fp, td);
3313
3314out:
3315 mtx_unlock(&Giant);
3316 return (error);
3317}
3318
3319/*
3320 * MPSAFE
3321 */
3322int
3323__mac_get_file(struct thread *td, struct __mac_get_file_args *uap)
3324{
3325 struct nameidata nd;
3326 struct mac extmac;
3327 int error;
3328
3329 mtx_lock(&Giant);
3330 NDINIT(&nd, LOOKUP, LOCKLEAF | FOLLOW, UIO_USERSPACE,
3331 SCARG(uap, path_p), td);
3332 error = namei(&nd);
3333 if (error)
3334 goto out;
3335
3336 error = vn_refreshlabel(nd.ni_vp, td->td_ucred);
3337 if (error == 0)
3338 error = mac_externalize(&nd.ni_vp->v_label, &extmac);
3339 NDFREE(&nd, 0);
3340 if (error)
3341 goto out;
3342
3343 error = copyout(&extmac, SCARG(uap, mac_p), sizeof(extmac));
3344
3345out:
3346 mtx_unlock(&Giant);
3347 return (error);
3348}
3349
3350/*
3351 * MPSAFE
3352 */
3353int
3354__mac_set_fd(struct thread *td, struct __mac_set_fd_args *uap)
3355{
3356 struct file *fp;
3357 struct mac extmac;
3358 struct label intlabel;
3359 struct mount *mp;
3360 struct vnode *vp;
3361 struct pipe *pipe;
3362 int error;
3363
3364 mtx_lock(&Giant);
3365 error = fget(td, SCARG(uap, fd), &fp);
3366 if (error)
3367 goto out1;
3368
3369 error = copyin(SCARG(uap, mac_p), &extmac, sizeof(extmac));
3370 if (error)
3371 goto out2;
3372
3373 error = mac_internalize(&intlabel, &extmac);
3374 if (error)
3375 goto out2;
3376
3377 switch (fp->f_type) {
3378 case DTYPE_FIFO:
3379 case DTYPE_VNODE:
3380 vp = (struct vnode *)fp->f_data;
3381 error = vn_start_write(vp, &mp, V_WAIT | PCATCH);
3382 if (error != 0)
3383 break;
3384
3385 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
3386 error = vn_setlabel(vp, &intlabel, td->td_ucred);
3387 VOP_UNLOCK(vp, 0, td);
3388 vn_finished_write(mp);
3389 mac_destroy_temp(&intlabel);
3390 break;
3391 case DTYPE_PIPE:
3392 pipe = (struct pipe *)fp->f_data;
3393 PIPE_LOCK(pipe);
3394 error = mac_pipe_label_set(td->td_ucred, pipe, &intlabel);
3395 PIPE_UNLOCK(pipe);
3396 break;
3397 default:
3398 error = EINVAL;
3399 }
3400
3401out2:
3402 fdrop(fp, td);
3403out1:
3404 mtx_unlock(&Giant);
3405 return (error);
3406}
3407
3408/*
3409 * MPSAFE
3410 */
3411int
3412__mac_set_file(struct thread *td, struct __mac_set_file_args *uap)
3413{
3414 struct nameidata nd;
3415 struct mac extmac;
3416 struct label intlabel;
3417 struct mount *mp;
3418 int error;
3419
3420 mtx_lock(&Giant);
3421
3422 error = copyin(SCARG(uap, mac_p), &extmac, sizeof(extmac));
3423 if (error)
3424 goto out;
3425
3426 error = mac_internalize(&intlabel, &extmac);
3427 if (error)
3428 goto out;
3429
3430 NDINIT(&nd, LOOKUP, LOCKLEAF | FOLLOW, UIO_USERSPACE,
3431 SCARG(uap, path_p), td);
3432 error = namei(&nd);
3433 if (error)
3434 goto out2;
3435 error = vn_start_write(nd.ni_vp, &mp, V_WAIT | PCATCH);
3436 if (error)
3437 goto out2;
3438
3439 error = vn_setlabel(nd.ni_vp, &intlabel, td->td_ucred);
3440
3441 vn_finished_write(mp);
3442out2:
3443 mac_destroy_temp(&intlabel);
3444 NDFREE(&nd, 0);
3445out:
3446 mtx_unlock(&Giant);
3447 return (error);
3448}
3449
3450int
3451mac_syscall(struct thread *td, struct mac_syscall_args *uap)
3452{
3453 struct mac_policy_conf *mpc;
3454 char target[MAC_MAX_POLICY_NAME];
3455 int error;
3456
3457 error = copyinstr(SCARG(uap, policy), target, sizeof(target), NULL);
3458 if (error)
3459 return (error);
3460
3461 error = ENOSYS;
3462 MAC_POLICY_LIST_BUSY();
3463 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) {
3464 if (strcmp(mpc->mpc_name, target) == 0 &&
3465 mpc->mpc_ops->mpo_syscall != NULL) {
3466 error = mpc->mpc_ops->mpo_syscall(td,
3467 SCARG(uap, call), SCARG(uap, arg));
3468 goto out;
3469 }
3470 }
3471
3472out:
3473 MAC_POLICY_LIST_UNBUSY();
3474 return (error);
3475}
3476
3477SYSINIT(mac, SI_SUB_MAC, SI_ORDER_FIRST, mac_init, NULL);
3478SYSINIT(mac_late, SI_SUB_MAC_LATE, SI_ORDER_FIRST, mac_late_init, NULL);
3479
3480#else /* !MAC */
3481
3482int
3483__mac_get_proc(struct thread *td, struct __mac_get_proc_args *uap)
3484{
3485
3486 return (ENOSYS);
3487}
3488
3489int
3490__mac_set_proc(struct thread *td, struct __mac_set_proc_args *uap)
3491{
3492
3493 return (ENOSYS);
3494}
3495
3496int
3497__mac_get_fd(struct thread *td, struct __mac_get_fd_args *uap)
3498{
3499
3500 return (ENOSYS);
3501}
3502
3503int
3504__mac_get_file(struct thread *td, struct __mac_get_file_args *uap)
3505{
3506
3507 return (ENOSYS);
3508}
3509
3510int
3511__mac_set_fd(struct thread *td, struct __mac_set_fd_args *uap)
3512{
3513
3514 return (ENOSYS);
3515}
3516
3517int
3518__mac_set_file(struct thread *td, struct __mac_set_file_args *uap)
3519{
3520
3521 return (ENOSYS);
3522}
3523
3524int
3525mac_syscall(struct thread *td, struct mac_syscall_args *uap)
3526{
3527
3528 return (ENOSYS);
3529}
3530
3531#endif /* !MAC */