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_process.c 104533 2002-10-05 18:40:10Z 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
224MALLOC_DEFINE(M_MACOPVEC, "macopvec", "MAC policy operation vector");
225MALLOC_DEFINE(M_MACPIPELABEL, "macpipelabel", "MAC labels for pipes");
226
227/*
228 * mac_policy_list_lock protects the consistency of 'mac_policy_list',
229 * the linked list of attached policy modules. Read-only consumers of
230 * the list must acquire a shared lock for the duration of their use;
231 * writers must acquire an exclusive lock. Note that for compound
232 * operations, locks should be held for the entire compound operation,
233 * and that this is not yet done for relabel requests.
234 */
235static struct mtx mac_policy_list_lock;
236static LIST_HEAD(, mac_policy_conf) mac_policy_list;
237static int mac_policy_list_busy;
238#define MAC_POLICY_LIST_LOCKINIT() mtx_init(&mac_policy_list_lock, \
239 "mac_policy_list_lock", NULL, MTX_DEF);
240#define MAC_POLICY_LIST_LOCK() mtx_lock(&mac_policy_list_lock);
241#define MAC_POLICY_LIST_UNLOCK() mtx_unlock(&mac_policy_list_lock);
242
243#define MAC_POLICY_LIST_BUSY() do { \
244 MAC_POLICY_LIST_LOCK(); \
245 mac_policy_list_busy++; \
246 MAC_POLICY_LIST_UNLOCK(); \
247} while (0)
248
249#define MAC_POLICY_LIST_UNBUSY() do { \
250 MAC_POLICY_LIST_LOCK(); \
251 mac_policy_list_busy--; \
252 if (mac_policy_list_busy < 0) \
253 panic("Extra mac_policy_list_busy--"); \
254 MAC_POLICY_LIST_UNLOCK(); \
255} while (0)
256
257/*
258 * MAC_CHECK performs the designated check by walking the policy
259 * module list and checking with each as to how it feels about the
260 * request. Note that it returns its value via 'error' in the scope
261 * of the caller.
262 */
263#define MAC_CHECK(check, args...) do { \
264 struct mac_policy_conf *mpc; \
265 \
266 error = 0; \
267 MAC_POLICY_LIST_BUSY(); \
268 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \
269 if (mpc->mpc_ops->mpo_ ## check != NULL) \
270 error = error_select( \
271 mpc->mpc_ops->mpo_ ## check (args), \
272 error); \
273 } \
274 MAC_POLICY_LIST_UNBUSY(); \
275} while (0)
276
277/*
278 * MAC_BOOLEAN performs the designated boolean composition by walking
279 * the module list, invoking each instance of the operation, and
280 * combining the results using the passed C operator. Note that it
281 * returns its value via 'result' in the scope of the caller, which
282 * should be initialized by the caller in a meaningful way to get
283 * a meaningful result.
284 */
285#define MAC_BOOLEAN(operation, composition, args...) do { \
286 struct mac_policy_conf *mpc; \
287 \
288 MAC_POLICY_LIST_BUSY(); \
289 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \
290 if (mpc->mpc_ops->mpo_ ## operation != NULL) \
291 result = result composition \
292 mpc->mpc_ops->mpo_ ## operation (args); \
293 } \
294 MAC_POLICY_LIST_UNBUSY(); \
295} while (0)
296
297/*
298 * MAC_PERFORM performs the designated operation by walking the policy
299 * module list and invoking that operation for each policy.
300 */
301#define MAC_PERFORM(operation, args...) do { \
302 struct mac_policy_conf *mpc; \
303 \
304 MAC_POLICY_LIST_BUSY(); \
305 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \
306 if (mpc->mpc_ops->mpo_ ## operation != NULL) \
307 mpc->mpc_ops->mpo_ ## operation (args); \
308 } \
309 MAC_POLICY_LIST_UNBUSY(); \
310} while (0)
311
312/*
313 * Initialize the MAC subsystem, including appropriate SMP locks.
314 */
315static void
316mac_init(void)
317{
318
319 LIST_INIT(&mac_policy_list);
320 MAC_POLICY_LIST_LOCKINIT();
321}
322
323/*
324 * For the purposes of modules that want to know if they were loaded
325 * "early", set the mac_late flag once we've processed modules either
326 * linked into the kernel, or loaded before the kernel startup.
327 */
328static void
329mac_late_init(void)
330{
331
332 mac_late = 1;
333}
334
335/*
336 * Allow MAC policy modules to register during boot, etc.
337 */
338int
339mac_policy_modevent(module_t mod, int type, void *data)
340{
341 struct mac_policy_conf *mpc;
342 int error;
343
344 error = 0;
345 mpc = (struct mac_policy_conf *) data;
346
347 switch (type) {
348 case MOD_LOAD:
349 if (mpc->mpc_loadtime_flags & MPC_LOADTIME_FLAG_NOTLATE &&
350 mac_late) {
351 printf("mac_policy_modevent: can't load %s policy "
352 "after booting\n", mpc->mpc_name);
353 error = EBUSY;
354 break;
355 }
356 error = mac_policy_register(mpc);
357 break;
358 case MOD_UNLOAD:
359 /* Don't unregister the module if it was never registered. */
360 if ((mpc->mpc_runtime_flags & MPC_RUNTIME_FLAG_REGISTERED)
361 != 0)
362 error = mac_policy_unregister(mpc);
363 else
364 error = 0;
365 break;
366 default:
367 break;
368 }
369
370 return (error);
371}
372
373static int
374mac_policy_register(struct mac_policy_conf *mpc)
375{
376 struct mac_policy_conf *tmpc;
377 struct mac_policy_op_entry *mpe;
378 int slot;
379
380 MALLOC(mpc->mpc_ops, struct mac_policy_ops *, sizeof(*mpc->mpc_ops),
381 M_MACOPVEC, M_WAITOK | M_ZERO);
382 for (mpe = mpc->mpc_entries; mpe->mpe_constant != MAC_OP_LAST; mpe++) {
383 switch (mpe->mpe_constant) {
384 case MAC_OP_LAST:
385 /*
386 * Doesn't actually happen, but this allows checking
387 * that all enumerated values are handled.
388 */
389 break;
390 case MAC_DESTROY:
391 mpc->mpc_ops->mpo_destroy =
392 mpe->mpe_function;
393 break;
394 case MAC_INIT:
395 mpc->mpc_ops->mpo_init =
396 mpe->mpe_function;
397 break;
398 case MAC_SYSCALL:
399 mpc->mpc_ops->mpo_syscall =
400 mpe->mpe_function;
401 break;
402 case MAC_INIT_BPFDESC_LABEL:
403 mpc->mpc_ops->mpo_init_bpfdesc_label =
404 mpe->mpe_function;
405 break;
406 case MAC_INIT_CRED_LABEL:
407 mpc->mpc_ops->mpo_init_cred_label =
408 mpe->mpe_function;
409 break;
410 case MAC_INIT_DEVFSDIRENT_LABEL:
411 mpc->mpc_ops->mpo_init_devfsdirent_label =
412 mpe->mpe_function;
413 break;
414 case MAC_INIT_IFNET_LABEL:
415 mpc->mpc_ops->mpo_init_ifnet_label =
416 mpe->mpe_function;
417 break;
418 case MAC_INIT_IPQ_LABEL:
419 mpc->mpc_ops->mpo_init_ipq_label =
420 mpe->mpe_function;
421 break;
422 case MAC_INIT_MBUF_LABEL:
423 mpc->mpc_ops->mpo_init_mbuf_label =
424 mpe->mpe_function;
425 break;
426 case MAC_INIT_MOUNT_LABEL:
427 mpc->mpc_ops->mpo_init_mount_label =
428 mpe->mpe_function;
429 break;
430 case MAC_INIT_MOUNT_FS_LABEL:
431 mpc->mpc_ops->mpo_init_mount_fs_label =
432 mpe->mpe_function;
433 break;
434 case MAC_INIT_PIPE_LABEL:
435 mpc->mpc_ops->mpo_init_pipe_label =
436 mpe->mpe_function;
437 break;
438 case MAC_INIT_SOCKET_LABEL:
439 mpc->mpc_ops->mpo_init_socket_label =
440 mpe->mpe_function;
441 break;
442 case MAC_INIT_SOCKET_PEER_LABEL:
443 mpc->mpc_ops->mpo_init_socket_peer_label =
444 mpe->mpe_function;
445 break;
446 case MAC_INIT_TEMP_LABEL:
447 mpc->mpc_ops->mpo_init_temp_label =
448 mpe->mpe_function;
449 break;
450 case MAC_INIT_VNODE_LABEL:
451 mpc->mpc_ops->mpo_init_vnode_label =
452 mpe->mpe_function;
453 break;
454 case MAC_DESTROY_BPFDESC_LABEL:
455 mpc->mpc_ops->mpo_destroy_bpfdesc_label =
456 mpe->mpe_function;
457 break;
458 case MAC_DESTROY_CRED_LABEL:
459 mpc->mpc_ops->mpo_destroy_cred_label =
460 mpe->mpe_function;
461 break;
462 case MAC_DESTROY_DEVFSDIRENT_LABEL:
463 mpc->mpc_ops->mpo_destroy_devfsdirent_label =
464 mpe->mpe_function;
465 break;
466 case MAC_DESTROY_IFNET_LABEL:
467 mpc->mpc_ops->mpo_destroy_ifnet_label =
468 mpe->mpe_function;
469 break;
470 case MAC_DESTROY_IPQ_LABEL:
471 mpc->mpc_ops->mpo_destroy_ipq_label =
472 mpe->mpe_function;
473 break;
474 case MAC_DESTROY_MBUF_LABEL:
475 mpc->mpc_ops->mpo_destroy_mbuf_label =
476 mpe->mpe_function;
477 break;
478 case MAC_DESTROY_MOUNT_LABEL:
479 mpc->mpc_ops->mpo_destroy_mount_label =
480 mpe->mpe_function;
481 break;
482 case MAC_DESTROY_MOUNT_FS_LABEL:
483 mpc->mpc_ops->mpo_destroy_mount_fs_label =
484 mpe->mpe_function;
485 break;
486 case MAC_DESTROY_PIPE_LABEL:
487 mpc->mpc_ops->mpo_destroy_pipe_label =
488 mpe->mpe_function;
489 break;
490 case MAC_DESTROY_SOCKET_LABEL:
491 mpc->mpc_ops->mpo_destroy_socket_label =
492 mpe->mpe_function;
493 break;
494 case MAC_DESTROY_SOCKET_PEER_LABEL:
495 mpc->mpc_ops->mpo_destroy_socket_peer_label =
496 mpe->mpe_function;
497 break;
498 case MAC_DESTROY_TEMP_LABEL:
499 mpc->mpc_ops->mpo_destroy_temp_label =
500 mpe->mpe_function;
501 break;
502 case MAC_DESTROY_VNODE_LABEL:
503 mpc->mpc_ops->mpo_destroy_vnode_label =
504 mpe->mpe_function;
505 break;
506 case MAC_EXTERNALIZE:
507 mpc->mpc_ops->mpo_externalize =
508 mpe->mpe_function;
509 break;
510 case MAC_INTERNALIZE:
511 mpc->mpc_ops->mpo_internalize =
512 mpe->mpe_function;
513 break;
514 case MAC_CREATE_DEVFS_DEVICE:
515 mpc->mpc_ops->mpo_create_devfs_device =
516 mpe->mpe_function;
517 break;
518 case MAC_CREATE_DEVFS_DIRECTORY:
519 mpc->mpc_ops->mpo_create_devfs_directory =
520 mpe->mpe_function;
521 break;
522 case MAC_CREATE_DEVFS_SYMLINK:
523 mpc->mpc_ops->mpo_create_devfs_symlink =
524 mpe->mpe_function;
525 break;
526 case MAC_CREATE_DEVFS_VNODE:
527 mpc->mpc_ops->mpo_create_devfs_vnode =
528 mpe->mpe_function;
529 break;
530 case MAC_STDCREATEVNODE_EA:
531 mpc->mpc_ops->mpo_stdcreatevnode_ea =
532 mpe->mpe_function;
533 break;
534 case MAC_CREATE_VNODE:
535 mpc->mpc_ops->mpo_create_vnode =
536 mpe->mpe_function;
537 break;
538 case MAC_CREATE_MOUNT:
539 mpc->mpc_ops->mpo_create_mount =
540 mpe->mpe_function;
541 break;
542 case MAC_CREATE_ROOT_MOUNT:
543 mpc->mpc_ops->mpo_create_root_mount =
544 mpe->mpe_function;
545 break;
546 case MAC_RELABEL_VNODE:
547 mpc->mpc_ops->mpo_relabel_vnode =
548 mpe->mpe_function;
549 break;
550 case MAC_UPDATE_DEVFSDIRENT:
551 mpc->mpc_ops->mpo_update_devfsdirent =
552 mpe->mpe_function;
553 break;
554 case MAC_UPDATE_PROCFSVNODE:
555 mpc->mpc_ops->mpo_update_procfsvnode =
556 mpe->mpe_function;
557 break;
558 case MAC_UPDATE_VNODE_FROM_EXTATTR:
559 mpc->mpc_ops->mpo_update_vnode_from_extattr =
560 mpe->mpe_function;
561 break;
562 case MAC_UPDATE_VNODE_FROM_EXTERNALIZED:
563 mpc->mpc_ops->mpo_update_vnode_from_externalized =
564 mpe->mpe_function;
565 break;
566 case MAC_UPDATE_VNODE_FROM_MOUNT:
567 mpc->mpc_ops->mpo_update_vnode_from_mount =
568 mpe->mpe_function;
569 break;
570 case MAC_CREATE_MBUF_FROM_SOCKET:
571 mpc->mpc_ops->mpo_create_mbuf_from_socket =
572 mpe->mpe_function;
573 break;
574 case MAC_CREATE_PIPE:
575 mpc->mpc_ops->mpo_create_pipe =
576 mpe->mpe_function;
577 break;
578 case MAC_CREATE_SOCKET:
579 mpc->mpc_ops->mpo_create_socket =
580 mpe->mpe_function;
581 break;
582 case MAC_CREATE_SOCKET_FROM_SOCKET:
583 mpc->mpc_ops->mpo_create_socket_from_socket =
584 mpe->mpe_function;
585 break;
586 case MAC_RELABEL_PIPE:
587 mpc->mpc_ops->mpo_relabel_pipe =
588 mpe->mpe_function;
589 break;
590 case MAC_RELABEL_SOCKET:
591 mpc->mpc_ops->mpo_relabel_socket =
592 mpe->mpe_function;
593 break;
594 case MAC_SET_SOCKET_PEER_FROM_MBUF:
595 mpc->mpc_ops->mpo_set_socket_peer_from_mbuf =
596 mpe->mpe_function;
597 break;
598 case MAC_SET_SOCKET_PEER_FROM_SOCKET:
599 mpc->mpc_ops->mpo_set_socket_peer_from_socket =
600 mpe->mpe_function;
601 break;
602 case MAC_CREATE_BPFDESC:
603 mpc->mpc_ops->mpo_create_bpfdesc =
604 mpe->mpe_function;
605 break;
606 case MAC_CREATE_DATAGRAM_FROM_IPQ:
607 mpc->mpc_ops->mpo_create_datagram_from_ipq =
608 mpe->mpe_function;
609 break;
610 case MAC_CREATE_FRAGMENT:
611 mpc->mpc_ops->mpo_create_fragment =
612 mpe->mpe_function;
613 break;
614 case MAC_CREATE_IFNET:
615 mpc->mpc_ops->mpo_create_ifnet =
616 mpe->mpe_function;
617 break;
618 case MAC_CREATE_IPQ:
619 mpc->mpc_ops->mpo_create_ipq =
620 mpe->mpe_function;
621 break;
622 case MAC_CREATE_MBUF_FROM_MBUF:
623 mpc->mpc_ops->mpo_create_mbuf_from_mbuf =
624 mpe->mpe_function;
625 break;
626 case MAC_CREATE_MBUF_LINKLAYER:
627 mpc->mpc_ops->mpo_create_mbuf_linklayer =
628 mpe->mpe_function;
629 break;
630 case MAC_CREATE_MBUF_FROM_BPFDESC:
631 mpc->mpc_ops->mpo_create_mbuf_from_bpfdesc =
632 mpe->mpe_function;
633 break;
634 case MAC_CREATE_MBUF_FROM_IFNET:
635 mpc->mpc_ops->mpo_create_mbuf_from_ifnet =
636 mpe->mpe_function;
637 break;
638 case MAC_CREATE_MBUF_MULTICAST_ENCAP:
639 mpc->mpc_ops->mpo_create_mbuf_multicast_encap =
640 mpe->mpe_function;
641 break;
642 case MAC_CREATE_MBUF_NETLAYER:
643 mpc->mpc_ops->mpo_create_mbuf_netlayer =
644 mpe->mpe_function;
645 break;
646 case MAC_FRAGMENT_MATCH:
647 mpc->mpc_ops->mpo_fragment_match =
648 mpe->mpe_function;
649 break;
650 case MAC_RELABEL_IFNET:
651 mpc->mpc_ops->mpo_relabel_ifnet =
652 mpe->mpe_function;
653 break;
654 case MAC_UPDATE_IPQ:
655 mpc->mpc_ops->mpo_update_ipq =
656 mpe->mpe_function;
657 break;
658 case MAC_CREATE_CRED:
659 mpc->mpc_ops->mpo_create_cred =
660 mpe->mpe_function;
661 break;
662 case MAC_EXECVE_TRANSITION:
663 mpc->mpc_ops->mpo_execve_transition =
664 mpe->mpe_function;
665 break;
666 case MAC_EXECVE_WILL_TRANSITION:
667 mpc->mpc_ops->mpo_execve_will_transition =
668 mpe->mpe_function;
669 break;
670 case MAC_CREATE_PROC0:
671 mpc->mpc_ops->mpo_create_proc0 =
672 mpe->mpe_function;
673 break;
674 case MAC_CREATE_PROC1:
675 mpc->mpc_ops->mpo_create_proc1 =
676 mpe->mpe_function;
677 break;
678 case MAC_RELABEL_CRED:
679 mpc->mpc_ops->mpo_relabel_cred =
680 mpe->mpe_function;
681 break;
682 case MAC_THREAD_USERRET:
683 mpc->mpc_ops->mpo_thread_userret =
684 mpe->mpe_function;
685 break;
686 case MAC_CHECK_BPFDESC_RECEIVE:
687 mpc->mpc_ops->mpo_check_bpfdesc_receive =
688 mpe->mpe_function;
689 break;
690 case MAC_CHECK_CRED_RELABEL:
691 mpc->mpc_ops->mpo_check_cred_relabel =
692 mpe->mpe_function;
693 break;
694 case MAC_CHECK_CRED_VISIBLE:
695 mpc->mpc_ops->mpo_check_cred_visible =
696 mpe->mpe_function;
697 break;
698 case MAC_CHECK_IFNET_RELABEL:
699 mpc->mpc_ops->mpo_check_ifnet_relabel =
700 mpe->mpe_function;
701 break;
702 case MAC_CHECK_IFNET_TRANSMIT:
703 mpc->mpc_ops->mpo_check_ifnet_transmit =
704 mpe->mpe_function;
705 break;
706 case MAC_CHECK_MOUNT_STAT:
707 mpc->mpc_ops->mpo_check_mount_stat =
708 mpe->mpe_function;
709 break;
710 case MAC_CHECK_PIPE_IOCTL:
711 mpc->mpc_ops->mpo_check_pipe_ioctl =
712 mpe->mpe_function;
713 break;
714 case MAC_CHECK_PIPE_POLL:
715 mpc->mpc_ops->mpo_check_pipe_poll =
716 mpe->mpe_function;
717 break;
718 case MAC_CHECK_PIPE_READ:
719 mpc->mpc_ops->mpo_check_pipe_read =
720 mpe->mpe_function;
721 break;
722 case MAC_CHECK_PIPE_RELABEL:
723 mpc->mpc_ops->mpo_check_pipe_relabel =
724 mpe->mpe_function;
725 break;
726 case MAC_CHECK_PIPE_STAT:
727 mpc->mpc_ops->mpo_check_pipe_stat =
728 mpe->mpe_function;
729 break;
730 case MAC_CHECK_PIPE_WRITE:
731 mpc->mpc_ops->mpo_check_pipe_write =
732 mpe->mpe_function;
733 break;
734 case MAC_CHECK_PROC_DEBUG:
735 mpc->mpc_ops->mpo_check_proc_debug =
736 mpe->mpe_function;
737 break;
738 case MAC_CHECK_PROC_SCHED:
739 mpc->mpc_ops->mpo_check_proc_sched =
740 mpe->mpe_function;
741 break;
742 case MAC_CHECK_PROC_SIGNAL:
743 mpc->mpc_ops->mpo_check_proc_signal =
744 mpe->mpe_function;
745 break;
746 case MAC_CHECK_SOCKET_BIND:
747 mpc->mpc_ops->mpo_check_socket_bind =
748 mpe->mpe_function;
749 break;
750 case MAC_CHECK_SOCKET_CONNECT:
751 mpc->mpc_ops->mpo_check_socket_connect =
752 mpe->mpe_function;
753 break;
754 case MAC_CHECK_SOCKET_DELIVER:
755 mpc->mpc_ops->mpo_check_socket_deliver =
756 mpe->mpe_function;
757 break;
758 case MAC_CHECK_SOCKET_LISTEN:
759 mpc->mpc_ops->mpo_check_socket_listen =
760 mpe->mpe_function;
761 break;
762 case MAC_CHECK_SOCKET_RELABEL:
763 mpc->mpc_ops->mpo_check_socket_relabel =
764 mpe->mpe_function;
765 break;
766 case MAC_CHECK_SOCKET_VISIBLE:
767 mpc->mpc_ops->mpo_check_socket_visible =
768 mpe->mpe_function;
769 break;
770 case MAC_CHECK_VNODE_ACCESS:
771 mpc->mpc_ops->mpo_check_vnode_access =
772 mpe->mpe_function;
773 break;
774 case MAC_CHECK_VNODE_CHDIR:
775 mpc->mpc_ops->mpo_check_vnode_chdir =
776 mpe->mpe_function;
777 break;
778 case MAC_CHECK_VNODE_CHROOT:
779 mpc->mpc_ops->mpo_check_vnode_chroot =
780 mpe->mpe_function;
781 break;
782 case MAC_CHECK_VNODE_CREATE:
783 mpc->mpc_ops->mpo_check_vnode_create =
784 mpe->mpe_function;
785 break;
786 case MAC_CHECK_VNODE_DELETE:
787 mpc->mpc_ops->mpo_check_vnode_delete =
788 mpe->mpe_function;
789 break;
790 case MAC_CHECK_VNODE_DELETEACL:
791 mpc->mpc_ops->mpo_check_vnode_deleteacl =
792 mpe->mpe_function;
793 break;
794 case MAC_CHECK_VNODE_EXEC:
795 mpc->mpc_ops->mpo_check_vnode_exec =
796 mpe->mpe_function;
797 break;
798 case MAC_CHECK_VNODE_GETACL:
799 mpc->mpc_ops->mpo_check_vnode_getacl =
800 mpe->mpe_function;
801 break;
802 case MAC_CHECK_VNODE_GETEXTATTR:
803 mpc->mpc_ops->mpo_check_vnode_getextattr =
804 mpe->mpe_function;
805 break;
806 case MAC_CHECK_VNODE_LINK:
807 mpc->mpc_ops->mpo_check_vnode_link =
808 mpe->mpe_function;
809 break;
810 case MAC_CHECK_VNODE_LOOKUP:
811 mpc->mpc_ops->mpo_check_vnode_lookup =
812 mpe->mpe_function;
813 break;
814 case MAC_CHECK_VNODE_MMAP_PERMS:
815 mpc->mpc_ops->mpo_check_vnode_mmap_perms =
816 mpe->mpe_function;
817 break;
818 case MAC_CHECK_VNODE_OPEN:
819 mpc->mpc_ops->mpo_check_vnode_open =
820 mpe->mpe_function;
821 break;
822 case MAC_CHECK_VNODE_POLL:
823 mpc->mpc_ops->mpo_check_vnode_poll =
824 mpe->mpe_function;
825 break;
826 case MAC_CHECK_VNODE_READ:
827 mpc->mpc_ops->mpo_check_vnode_read =
828 mpe->mpe_function;
829 break;
830 case MAC_CHECK_VNODE_READDIR:
831 mpc->mpc_ops->mpo_check_vnode_readdir =
832 mpe->mpe_function;
833 break;
834 case MAC_CHECK_VNODE_READLINK:
835 mpc->mpc_ops->mpo_check_vnode_readlink =
836 mpe->mpe_function;
837 break;
838 case MAC_CHECK_VNODE_RELABEL:
839 mpc->mpc_ops->mpo_check_vnode_relabel =
840 mpe->mpe_function;
841 break;
842 case MAC_CHECK_VNODE_RENAME_FROM:
843 mpc->mpc_ops->mpo_check_vnode_rename_from =
844 mpe->mpe_function;
845 break;
846 case MAC_CHECK_VNODE_RENAME_TO:
847 mpc->mpc_ops->mpo_check_vnode_rename_to =
848 mpe->mpe_function;
849 break;
850 case MAC_CHECK_VNODE_REVOKE:
851 mpc->mpc_ops->mpo_check_vnode_revoke =
852 mpe->mpe_function;
853 break;
854 case MAC_CHECK_VNODE_SETACL:
855 mpc->mpc_ops->mpo_check_vnode_setacl =
856 mpe->mpe_function;
857 break;
858 case MAC_CHECK_VNODE_SETEXTATTR:
859 mpc->mpc_ops->mpo_check_vnode_setextattr =
860 mpe->mpe_function;
861 break;
862 case MAC_CHECK_VNODE_SETFLAGS:
863 mpc->mpc_ops->mpo_check_vnode_setflags =
864 mpe->mpe_function;
865 break;
866 case MAC_CHECK_VNODE_SETMODE:
867 mpc->mpc_ops->mpo_check_vnode_setmode =
868 mpe->mpe_function;
869 break;
870 case MAC_CHECK_VNODE_SETOWNER:
871 mpc->mpc_ops->mpo_check_vnode_setowner =
872 mpe->mpe_function;
873 break;
874 case MAC_CHECK_VNODE_SETUTIMES:
875 mpc->mpc_ops->mpo_check_vnode_setutimes =
876 mpe->mpe_function;
877 break;
878 case MAC_CHECK_VNODE_STAT:
879 mpc->mpc_ops->mpo_check_vnode_stat =
880 mpe->mpe_function;
881 break;
882 case MAC_CHECK_VNODE_WRITE:
883 mpc->mpc_ops->mpo_check_vnode_write =
884 mpe->mpe_function;
885 break;
886/*
887 default:
888 printf("MAC policy `%s': unknown operation %d\n",
889 mpc->mpc_name, mpe->mpe_constant);
890 return (EINVAL);
891*/
892 }
893 }
894 MAC_POLICY_LIST_LOCK();
895 if (mac_policy_list_busy > 0) {
896 MAC_POLICY_LIST_UNLOCK();
897 FREE(mpc->mpc_ops, M_MACOPVEC);
898 mpc->mpc_ops = NULL;
899 return (EBUSY);
900 }
901 LIST_FOREACH(tmpc, &mac_policy_list, mpc_list) {
902 if (strcmp(tmpc->mpc_name, mpc->mpc_name) == 0) {
903 MAC_POLICY_LIST_UNLOCK();
904 FREE(mpc->mpc_ops, M_MACOPVEC);
905 mpc->mpc_ops = NULL;
906 return (EEXIST);
907 }
908 }
909 if (mpc->mpc_field_off != NULL) {
910 slot = ffs(mac_policy_offsets_free);
911 if (slot == 0) {
912 MAC_POLICY_LIST_UNLOCK();
913 FREE(mpc->mpc_ops, M_MACOPVEC);
914 mpc->mpc_ops = NULL;
915 return (ENOMEM);
916 }
917 slot--;
918 mac_policy_offsets_free &= ~(1 << slot);
919 *mpc->mpc_field_off = slot;
920 }
921 mpc->mpc_runtime_flags |= MPC_RUNTIME_FLAG_REGISTERED;
922 LIST_INSERT_HEAD(&mac_policy_list, mpc, mpc_list);
923
924 /* Per-policy initialization. */
925 if (mpc->mpc_ops->mpo_init != NULL)
926 (*(mpc->mpc_ops->mpo_init))(mpc);
927 MAC_POLICY_LIST_UNLOCK();
928
929 printf("Security policy loaded: %s (%s)\n", mpc->mpc_fullname,
930 mpc->mpc_name);
931
932 return (0);
933}
934
935static int
936mac_policy_unregister(struct mac_policy_conf *mpc)
937{
938
939 /*
940 * If we fail the load, we may get a request to unload. Check
941 * to see if we did the run-time registration, and if not,
942 * silently succeed.
943 */
944 MAC_POLICY_LIST_LOCK();
945 if ((mpc->mpc_runtime_flags & MPC_RUNTIME_FLAG_REGISTERED) == 0) {
946 MAC_POLICY_LIST_UNLOCK();
947 return (0);
948 }
949#if 0
950 /*
951 * Don't allow unloading modules with private data.
952 */
953 if (mpc->mpc_field_off != NULL) {
954 MAC_POLICY_LIST_UNLOCK();
955 return (EBUSY);
956 }
957#endif
958 /*
959 * Only allow the unload to proceed if the module is unloadable
960 * by its own definition.
961 */
962 if ((mpc->mpc_loadtime_flags & MPC_LOADTIME_FLAG_UNLOADOK) == 0) {
963 MAC_POLICY_LIST_UNLOCK();
964 return (EBUSY);
965 }
966 /*
967 * Right now, we EBUSY if the list is in use. In the future,
968 * for reliability reasons, we might want to sleep and wakeup
969 * later to try again.
970 */
971 if (mac_policy_list_busy > 0) {
972 MAC_POLICY_LIST_UNLOCK();
973 return (EBUSY);
974 }
975 if (mpc->mpc_ops->mpo_destroy != NULL)
976 (*(mpc->mpc_ops->mpo_destroy))(mpc);
977
978 LIST_REMOVE(mpc, mpc_list);
979 MAC_POLICY_LIST_UNLOCK();
980
981 FREE(mpc->mpc_ops, M_MACOPVEC);
982 mpc->mpc_ops = NULL;
983
984 printf("Security policy unload: %s (%s)\n", mpc->mpc_fullname,
985 mpc->mpc_name);
986
987 return (0);
988}
989
990/*
991 * Define an error value precedence, and given two arguments, selects the
992 * value with the higher precedence.
993 */
994static int
995error_select(int error1, int error2)
996{
997
998 /* Certain decision-making errors take top priority. */
999 if (error1 == EDEADLK || error2 == EDEADLK)
1000 return (EDEADLK);
1001
1002 /* Invalid arguments should be reported where possible. */
1003 if (error1 == EINVAL || error2 == EINVAL)
1004 return (EINVAL);
1005
1006 /* Precedence goes to "visibility", with both process and file. */
1007 if (error1 == ESRCH || error2 == ESRCH)
1008 return (ESRCH);
1009
1010 if (error1 == ENOENT || error2 == ENOENT)
1011 return (ENOENT);
1012
1013 /* Precedence goes to DAC/MAC protections. */
1014 if (error1 == EACCES || error2 == EACCES)
1015 return (EACCES);
1016
1017 /* Precedence goes to privilege. */
1018 if (error1 == EPERM || error2 == EPERM)
1019 return (EPERM);
1020
1021 /* Precedence goes to error over success; otherwise, arbitrary. */
1022 if (error1 != 0)
1023 return (error1);
1024 return (error2);
1025}
1026
1027static void
1028mac_init_label(struct label *label)
1029{
1030
1031 bzero(label, sizeof(*label));
1032 label->l_flags = MAC_FLAG_INITIALIZED;
1033}
1034
1035static void
1036mac_destroy_label(struct label *label)
1037{
1038
1039 KASSERT(label->l_flags & MAC_FLAG_INITIALIZED,
1040 ("destroying uninitialized label"));
1041
1042 bzero(label, sizeof(*label));
1043 /* implicit: label->l_flags &= ~MAC_FLAG_INITIALIZED; */
1044}
1045
1046static void
1047mac_init_structmac(struct mac *mac)
1048{
1049
1050 bzero(mac, sizeof(*mac));
1051 mac->m_macflags = MAC_FLAG_INITIALIZED;
1052}
1053
1054void
1055mac_init_bpfdesc(struct bpf_d *bpf_d)
1056{
1057
1058 mac_init_label(&bpf_d->bd_label);
1059 MAC_PERFORM(init_bpfdesc_label, &bpf_d->bd_label);
1060#ifdef MAC_DEBUG
1061 atomic_add_int(&nmacbpfdescs, 1);
1062#endif
1063}
1064
1065void
1066mac_init_cred(struct ucred *cr)
1067{
1068
1069 mac_init_label(&cr->cr_label);
1070 MAC_PERFORM(init_cred_label, &cr->cr_label);
1071#ifdef MAC_DEBUG
1072 atomic_add_int(&nmaccreds, 1);
1073#endif
1074}
1075
1076void
1077mac_init_devfsdirent(struct devfs_dirent *de)
1078{
1079
1080 mac_init_label(&de->de_label);
1081 MAC_PERFORM(init_devfsdirent_label, &de->de_label);
1082#ifdef MAC_DEBUG
1083 atomic_add_int(&nmacdevfsdirents, 1);
1084#endif
1085}
1086
1087void
1088mac_init_ifnet(struct ifnet *ifp)
1089{
1090
1091 mac_init_label(&ifp->if_label);
1092 MAC_PERFORM(init_ifnet_label, &ifp->if_label);
1093#ifdef MAC_DEBUG
1094 atomic_add_int(&nmacifnets, 1);
1095#endif
1096}
1097
1098void
1099mac_init_ipq(struct ipq *ipq)
1100{
1101
1102 mac_init_label(&ipq->ipq_label);
1103 MAC_PERFORM(init_ipq_label, &ipq->ipq_label);
1104#ifdef MAC_DEBUG
1105 atomic_add_int(&nmacipqs, 1);
1106#endif
1107}
1108
1109int
1110mac_init_mbuf(struct mbuf *m, int flag)
1111{
1112 int error;
1113
1114 KASSERT(m->m_flags & M_PKTHDR, ("mac_init_mbuf on non-header mbuf"));
1115
1116 mac_init_label(&m->m_pkthdr.label);
1117
1118 MAC_CHECK(init_mbuf_label, &m->m_pkthdr.label, flag);
1119 if (error) {
1120 MAC_PERFORM(destroy_mbuf_label, &m->m_pkthdr.label);
1121 mac_destroy_label(&m->m_pkthdr.label);
1122 }
1123
1124#ifdef MAC_DEBUG
1125 if (error == 0)
1126 atomic_add_int(&nmacmbufs, 1);
1127#endif
1128 return (error);
1129}
1130
1131void
1132mac_init_mount(struct mount *mp)
1133{
1134
1135 mac_init_label(&mp->mnt_mntlabel);
1136 mac_init_label(&mp->mnt_fslabel);
1137 MAC_PERFORM(init_mount_label, &mp->mnt_mntlabel);
1138 MAC_PERFORM(init_mount_fs_label, &mp->mnt_fslabel);
1139#ifdef MAC_DEBUG
1140 atomic_add_int(&nmacmounts, 1);
1141#endif
1142}
1143
1144void
1145mac_init_pipe(struct pipe *pipe)
1146{
1147 struct label *label;
1148
1149 label = malloc(sizeof(struct label), M_MACPIPELABEL, M_ZERO|M_WAITOK);
1150 mac_init_label(label);
1151 pipe->pipe_label = label;
1152 pipe->pipe_peer->pipe_label = label;
1153 MAC_PERFORM(init_pipe_label, pipe->pipe_label);
1154#ifdef MAC_DEBUG
1155 atomic_add_int(&nmacpipes, 1);
1156#endif
1157}
1158
1159void
1160mac_init_socket(struct socket *socket)
1161{
1162
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);
1167#ifdef MAC_DEBUG
1168 atomic_add_int(&nmacsockets, 1);
1169#endif
1170}
1171
1172static void
1173mac_init_temp(struct label *label)
1174{
1175
1176 mac_init_label(label);
1177 MAC_PERFORM(init_temp_label, label);
1178#ifdef MAC_DEBUG
1179 atomic_add_int(&nmactemp, 1);
1180#endif
1181}
1182
1183void
1184mac_init_vnode(struct vnode *vp)
1185{
1186
1187 mac_init_label(&vp->v_label);
1188 MAC_PERFORM(init_vnode_label, &vp->v_label);
1189#ifdef MAC_DEBUG
1190 atomic_add_int(&nmacvnodes, 1);
1191#endif
1192}
1193
1194void
1195mac_destroy_bpfdesc(struct bpf_d *bpf_d)
1196{
1197
1198 MAC_PERFORM(destroy_bpfdesc_label, &bpf_d->bd_label);
1199 mac_destroy_label(&bpf_d->bd_label);
1200#ifdef MAC_DEBUG
1201 atomic_subtract_int(&nmacbpfdescs, 1);
1202#endif
1203}
1204
1205void
1206mac_destroy_cred(struct ucred *cr)
1207{
1208
1209 MAC_PERFORM(destroy_cred_label, &cr->cr_label);
1210 mac_destroy_label(&cr->cr_label);
1211#ifdef MAC_DEBUG
1212 atomic_subtract_int(&nmaccreds, 1);
1213#endif
1214}
1215
1216void
1217mac_destroy_devfsdirent(struct devfs_dirent *de)
1218{
1219
1220 MAC_PERFORM(destroy_devfsdirent_label, &de->de_label);
1221 mac_destroy_label(&de->de_label);
1222#ifdef MAC_DEBUG
1223 atomic_subtract_int(&nmacdevfsdirents, 1);
1224#endif
1225}
1226
1227void
1228mac_destroy_ifnet(struct ifnet *ifp)
1229{
1230
1231 MAC_PERFORM(destroy_ifnet_label, &ifp->if_label);
1232 mac_destroy_label(&ifp->if_label);
1233#ifdef MAC_DEBUG
1234 atomic_subtract_int(&nmacifnets, 1);
1235#endif
1236}
1237
1238void
1239mac_destroy_ipq(struct ipq *ipq)
1240{
1241
1242 MAC_PERFORM(destroy_ipq_label, &ipq->ipq_label);
1243 mac_destroy_label(&ipq->ipq_label);
1244#ifdef MAC_DEBUG
1245 atomic_subtract_int(&nmacipqs, 1);
1246#endif
1247}
1248
1249void
1250mac_destroy_mbuf(struct mbuf *m)
1251{
1252
1253 MAC_PERFORM(destroy_mbuf_label, &m->m_pkthdr.label);
1254 mac_destroy_label(&m->m_pkthdr.label);
1255#ifdef MAC_DEBUG
1256 atomic_subtract_int(&nmacmbufs, 1);
1257#endif
1258}
1259
1260void
1261mac_destroy_mount(struct mount *mp)
1262{
1263
1264 MAC_PERFORM(destroy_mount_label, &mp->mnt_mntlabel);
1265 MAC_PERFORM(destroy_mount_fs_label, &mp->mnt_fslabel);
1266 mac_destroy_label(&mp->mnt_fslabel);
1267 mac_destroy_label(&mp->mnt_mntlabel);
1268#ifdef MAC_DEBUG
1269 atomic_subtract_int(&nmacmounts, 1);
1270#endif
1271}
1272
1273void
1274mac_destroy_pipe(struct pipe *pipe)
1275{
1276
1277 MAC_PERFORM(destroy_pipe_label, pipe->pipe_label);
1278 mac_destroy_label(pipe->pipe_label);
1279 free(pipe->pipe_label, M_MACPIPELABEL);
1280#ifdef MAC_DEBUG
1281 atomic_subtract_int(&nmacpipes, 1);
1282#endif
1283}
1284
1285void
1286mac_destroy_socket(struct socket *socket)
1287{
1288
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);
1293#ifdef MAC_DEBUG
1294 atomic_subtract_int(&nmacsockets, 1);
1295#endif
1296}
1297
1298static void
1299mac_destroy_temp(struct label *label)
1300{
1301
1302 MAC_PERFORM(destroy_temp_label, label);
1303 mac_destroy_label(label);
1304#ifdef MAC_DEBUG
1305 atomic_subtract_int(&nmactemp, 1);
1306#endif
1307}
1308
1309void
1310mac_destroy_vnode(struct vnode *vp)
1311{
1312
1313 MAC_PERFORM(destroy_vnode_label, &vp->v_label);
1314 mac_destroy_label(&vp->v_label);
1315#ifdef MAC_DEBUG
1316 atomic_subtract_int(&nmacvnodes, 1);
1317#endif
1318}
1319
1320static int
1321mac_externalize(struct label *label, struct mac *mac)
1322{
1323 int error;
1324
1325 mac_init_structmac(mac);
1326 MAC_CHECK(externalize, label, mac);
1327
1328 return (error);
1329}
1330
1331static int
1332mac_internalize(struct label *label, struct mac *mac)
1333{
1334 int error;
1335
1336 mac_init_temp(label);
1337 MAC_CHECK(internalize, label, mac);
1338 if (error)
1339 mac_destroy_temp(label);
1340
1341 return (error);
1342}
1343
1344/*
1345 * Initialize MAC label for the first kernel process, from which other
1346 * kernel processes and threads are spawned.
1347 */
1348void
1349mac_create_proc0(struct ucred *cred)
1350{
1351
1352 MAC_PERFORM(create_proc0, cred);
1353}
1354
1355/*
1356 * Initialize MAC label for the first userland process, from which other
1357 * userland processes and threads are spawned.
1358 */
1359void
1360mac_create_proc1(struct ucred *cred)
1361{
1362
1363 MAC_PERFORM(create_proc1, cred);
1364}
1365
1366void
1367mac_thread_userret(struct thread *td)
1368{
1369
1370 MAC_PERFORM(thread_userret, td);
1371}
1372
1373/*
1374 * When a new process is created, its label must be initialized. Generally,
1375 * this involves inheritence from the parent process, modulo possible
1376 * deltas. This function allows that processing to take place.
1377 */
1378void
1379mac_create_cred(struct ucred *parent_cred, struct ucred *child_cred)
1380{
1381
1382 MAC_PERFORM(create_cred, parent_cred, child_cred);
1383}
1384
1385void
1386mac_update_devfsdirent(struct devfs_dirent *de, struct vnode *vp)
1387{
1388
1389 MAC_PERFORM(update_devfsdirent, de, &de->de_label, vp, &vp->v_label);
1390}
1391
1392void
1393mac_update_procfsvnode(struct vnode *vp, struct ucred *cred)
1394{
1395
1396 MAC_PERFORM(update_procfsvnode, vp, &vp->v_label, cred);
1397}
1398
1399/*
1400 * Support callout for policies that manage their own externalization
1401 * using extended attributes.
1402 */
1403static int
1404mac_update_vnode_from_extattr(struct vnode *vp, struct mount *mp)
1405{
1406 int error;
1407
1408 MAC_CHECK(update_vnode_from_extattr, vp, &vp->v_label, mp,
1409 &mp->mnt_fslabel);
1410
1411 return (error);
1412}
1413
1414/*
1415 * Given an externalized mac label, internalize it and stamp it on a
1416 * vnode.
1417 */
1418static int
1419mac_update_vnode_from_externalized(struct vnode *vp, struct mac *extmac)
1420{
1421 int error;
1422
1423 MAC_CHECK(update_vnode_from_externalized, vp, &vp->v_label, extmac);
1424
1425 return (error);
1426}
1427
1428/*
1429 * Call out to individual policies to update the label in a vnode from
1430 * the mountpoint.
1431 */
1432void
1433mac_update_vnode_from_mount(struct vnode *vp, struct mount *mp)
1434{
1435
1436 MAC_PERFORM(update_vnode_from_mount, vp, &vp->v_label, mp,
1437 &mp->mnt_fslabel);
1438
1439 ASSERT_VOP_LOCKED(vp, "mac_update_vnode_from_mount");
1440 if (mac_cache_fslabel_in_vnode)
1441 vp->v_vflag |= VV_CACHEDLABEL;
1442}
1443
1444/*
1445 * Implementation of VOP_REFRESHLABEL() that relies on extended attributes
1446 * to store label data. Can be referenced by filesystems supporting
1447 * extended attributes.
1448 */
1449int
1450vop_stdrefreshlabel_ea(struct vop_refreshlabel_args *ap)
1451{
1452 struct vnode *vp = ap->a_vp;
1453 struct mac extmac;
1454 int buflen, error;
1455
1456 ASSERT_VOP_LOCKED(vp, "vop_stdrefreshlabel_ea");
1457
1458 /*
1459 * Call out to external policies first. Order doesn't really
1460 * matter, as long as failure of one assures failure of all.
1461 */
1462 error = mac_update_vnode_from_extattr(vp, vp->v_mount);
1463 if (error)
1464 return (error);
1465
1466 buflen = sizeof(extmac);
1467 error = vn_extattr_get(vp, IO_NODELOCKED,
1468 FREEBSD_MAC_EXTATTR_NAMESPACE, FREEBSD_MAC_EXTATTR_NAME, &buflen,
1469 (char *)&extmac, curthread);
1470 switch (error) {
1471 case 0:
1472 /* Got it */
1473 break;
1474
1475 case ENOATTR:
1476 /*
1477 * Use the label from the mount point.
1478 */
1479 mac_update_vnode_from_mount(vp, vp->v_mount);
1480 return (0);
1481
1482 case EOPNOTSUPP:
1483 default:
1484 /* Fail horribly. */
1485 return (error);
1486 }
1487
1488 if (buflen != sizeof(extmac))
1489 error = EPERM; /* Fail very closed. */
1490 if (error == 0)
1491 error = mac_update_vnode_from_externalized(vp, &extmac);
1492 if (error == 0)
1493 vp->v_vflag |= VV_CACHEDLABEL;
1494 else {
1495 struct vattr va;
1496
1497 printf("Corrupted label on %s",
1498 vp->v_mount->mnt_stat.f_mntonname);
1499 if (VOP_GETATTR(vp, &va, curthread->td_ucred, curthread) == 0)
1500 printf(" inum %ld", va.va_fileid);
1501#ifdef MAC_DEBUG
1502 if (mac_debug_label_fallback) {
1503 printf(", falling back.\n");
1504 mac_update_vnode_from_mount(vp, vp->v_mount);
1505 error = 0;
1506 } else {
1507#endif
1508 printf(".\n");
1509 error = EPERM;
1510#ifdef MAC_DEBUG
1511 }
1512#endif
1513 }
1514
1515 return (error);
1516}
1517
1518/*
1519 * Make sure the vnode label is up-to-date. If EOPNOTSUPP, then we handle
1520 * the labeling activity outselves. Filesystems should be careful not
1521 * to change their minds regarding whether they support vop_refreshlabel()
1522 * for a vnode or not. Don't cache the vnode here, allow the file
1523 * system code to determine if it's safe to cache. If we update from
1524 * the mount, don't cache since a change to the mount label should affect
1525 * all vnodes.
1526 */
1527static int
1528vn_refreshlabel(struct vnode *vp, struct ucred *cred)
1529{
1530 int error;
1531
1532 ASSERT_VOP_LOCKED(vp, "vn_refreshlabel");
1533
1534 if (vp->v_mount == NULL) {
1535/*
1536 Eventually, we probably want to special-case refreshing
1537 of deadfs vnodes, and if there's a lock-free race somewhere,
1538 that case might be handled here.
1539
1540 mac_update_vnode_deadfs(vp);
1541 return (0);
1542 */
1543 /* printf("vn_refreshlabel: null v_mount\n"); */
1544 if (vp->v_type != VNON)
1545 printf(
1546 "vn_refreshlabel: null v_mount with non-VNON\n");
1547 return (EBADF);
1548 }
1549
1550 if (vp->v_vflag & VV_CACHEDLABEL) {
1551 mac_vnode_label_cache_hits++;
1552 return (0);
1553 } else
1554 mac_vnode_label_cache_misses++;
1555
1556 if ((vp->v_mount->mnt_flag & MNT_MULTILABEL) == 0) {
1557 mac_update_vnode_from_mount(vp, vp->v_mount);
1558 return (0);
1559 }
1560
1561 error = VOP_REFRESHLABEL(vp, cred, curthread);
1562 switch (error) {
1563 case EOPNOTSUPP:
1564 /*
1565 * If labels are not supported on this vnode, fall back to
1566 * the label in the mount and propagate it to the vnode.
1567 * There should probably be some sort of policy/flag/decision
1568 * about doing this.
1569 */
1570 mac_update_vnode_from_mount(vp, vp->v_mount);
1571 error = 0;
1572 default:
1573 return (error);
1574 }
1575}
1576
1577/*
1578 * Helper function for file systems using the vop_std*_ea() calls. This
1579 * function must be called after EA service is available for the vnode,
1580 * but before it's hooked up to the namespace so that the node persists
1581 * if there's a crash, or before it can be accessed. On successful
1582 * commit of the label to disk (etc), do cache the label.
1583 */
1584int
1585vop_stdcreatevnode_ea(struct vnode *dvp, struct vnode *tvp, struct ucred *cred)
1586{
1587 struct mac extmac;
1588 int error;
1589
1590 ASSERT_VOP_LOCKED(tvp, "vop_stdcreatevnode_ea");
1591 if ((dvp->v_mount->mnt_flag & MNT_MULTILABEL) == 0) {
1592 mac_update_vnode_from_mount(tvp, tvp->v_mount);
1593 } else {
1594 error = vn_refreshlabel(dvp, cred);
1595 if (error)
1596 return (error);
1597
1598 /*
1599 * Stick the label in the vnode. Then try to write to
1600 * disk. If we fail, return a failure to abort the
1601 * create operation. Really, this failure shouldn't
1602 * happen except in fairly unusual circumstances (out
1603 * of disk, etc).
1604 */
1605 mac_create_vnode(cred, dvp, tvp);
1606
1607 error = mac_stdcreatevnode_ea(tvp);
1608 if (error)
1609 return (error);
1610
1611 /*
1612 * XXX: Eventually this will go away and all policies will
1613 * directly manage their extended attributes.
1614 */
1615 error = mac_externalize(&tvp->v_label, &extmac);
1616 if (error)
1617 return (error);
1618
1619 error = vn_extattr_set(tvp, IO_NODELOCKED,
1620 FREEBSD_MAC_EXTATTR_NAMESPACE, FREEBSD_MAC_EXTATTR_NAME,
1621 sizeof(extmac), (char *)&extmac, curthread);
1622 if (error == 0)
1623 tvp->v_vflag |= VV_CACHEDLABEL;
1624 else {
1625#if 0
1626 /*
1627 * In theory, we could have fall-back behavior here.
1628 * It would probably be incorrect.
1629 */
1630#endif
1631 return (error);
1632 }
1633 }
1634
1635 return (0);
1636}
1637
1638void
1639mac_execve_transition(struct ucred *old, struct ucred *new, struct vnode *vp)
1640{
1641 int error;
1642
1643 ASSERT_VOP_LOCKED(vp, "mac_execve_transition");
1644
1645 error = vn_refreshlabel(vp, old);
1646 if (error) {
1647 printf("mac_execve_transition: vn_refreshlabel returned %d\n",
1648 error);
1649 printf("mac_execve_transition: using old vnode label\n");
1650 }
1651
1652 MAC_PERFORM(execve_transition, old, new, vp, &vp->v_label);
1653}
1654
1655int
1656mac_execve_will_transition(struct ucred *old, struct vnode *vp)
1657{
1658 int error, result;
1659
1660 error = vn_refreshlabel(vp, old);
1661 if (error)
1662 return (error);
1663
1664 result = 0;
1665 MAC_BOOLEAN(execve_will_transition, ||, old, vp, &vp->v_label);
1666
1667 return (result);
1668}
1669
1670int
1671mac_check_vnode_access(struct ucred *cred, struct vnode *vp, int flags)
1672{
1673 int error;
1674
1675 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_access");
1676
1677 if (!mac_enforce_fs)
1678 return (0);
1679
1680 error = vn_refreshlabel(vp, cred);
1681 if (error)
1682 return (error);
1683
1684 MAC_CHECK(check_vnode_access, cred, vp, &vp->v_label, flags);
1685 return (error);
1686}
1687
1688int
1689mac_check_vnode_chdir(struct ucred *cred, struct vnode *dvp)
1690{
1691 int error;
1692
1693 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_chdir");
1694
1695 if (!mac_enforce_fs)
1696 return (0);
1697
1698 error = vn_refreshlabel(dvp, cred);
1699 if (error)
1700 return (error);
1701
1702 MAC_CHECK(check_vnode_chdir, cred, dvp, &dvp->v_label);
1703 return (error);
1704}
1705
1706int
1707mac_check_vnode_chroot(struct ucred *cred, struct vnode *dvp)
1708{
1709 int error;
1710
1711 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_chroot");
1712
1713 if (!mac_enforce_fs)
1714 return (0);
1715
1716 error = vn_refreshlabel(dvp, cred);
1717 if (error)
1718 return (error);
1719
1720 MAC_CHECK(check_vnode_chroot, cred, dvp, &dvp->v_label);
1721 return (error);
1722}
1723
1724int
1725mac_check_vnode_create(struct ucred *cred, struct vnode *dvp,
1726 struct componentname *cnp, struct vattr *vap)
1727{
1728 int error;
1729
1730 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_create");
1731
1732 if (!mac_enforce_fs)
1733 return (0);
1734
1735 error = vn_refreshlabel(dvp, cred);
1736 if (error)
1737 return (error);
1738
1739 MAC_CHECK(check_vnode_create, cred, dvp, &dvp->v_label, cnp, vap);
1740 return (error);
1741}
1742
1743int
1744mac_check_vnode_delete(struct ucred *cred, struct vnode *dvp, struct vnode *vp,
1745 struct componentname *cnp)
1746{
1747 int error;
1748
1749 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_delete");
1750 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_delete");
1751
1752 if (!mac_enforce_fs)
1753 return (0);
1754
1755 error = vn_refreshlabel(dvp, cred);
1756 if (error)
1757 return (error);
1758 error = vn_refreshlabel(vp, cred);
1759 if (error)
1760 return (error);
1761
1762 MAC_CHECK(check_vnode_delete, cred, dvp, &dvp->v_label, vp,
1763 &vp->v_label, cnp);
1764 return (error);
1765}
1766
1767int
1768mac_check_vnode_deleteacl(struct ucred *cred, struct vnode *vp,
1769 acl_type_t type)
1770{
1771 int error;
1772
1773 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_deleteacl");
1774
1775 if (!mac_enforce_fs)
1776 return (0);
1777
1778 error = vn_refreshlabel(vp, cred);
1779 if (error)
1780 return (error);
1781
1782 MAC_CHECK(check_vnode_deleteacl, cred, vp, &vp->v_label, type);
1783 return (error);
1784}
1785
1786int
1787mac_check_vnode_exec(struct ucred *cred, struct vnode *vp)
1788{
1789 int error;
1790
1791 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_exec");
1792
1793 if (!mac_enforce_process && !mac_enforce_fs)
1794 return (0);
1795
1796 error = vn_refreshlabel(vp, cred);
1797 if (error)
1798 return (error);
1799 MAC_CHECK(check_vnode_exec, cred, vp, &vp->v_label);
1800
1801 return (error);
1802}
1803
1804int
1805mac_check_vnode_getacl(struct ucred *cred, struct vnode *vp, acl_type_t type)
1806{
1807 int error;
1808
1809 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_getacl");
1810
1811 if (!mac_enforce_fs)
1812 return (0);
1813
1814 error = vn_refreshlabel(vp, cred);
1815 if (error)
1816 return (error);
1817
1818 MAC_CHECK(check_vnode_getacl, cred, vp, &vp->v_label, type);
1819 return (error);
1820}
1821
1822int
1823mac_check_vnode_getextattr(struct ucred *cred, struct vnode *vp,
1824 int attrnamespace, const char *name, struct uio *uio)
1825{
1826 int error;
1827
1828 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_getextattr");
1829
1830 if (!mac_enforce_fs)
1831 return (0);
1832
1833 error = vn_refreshlabel(vp, cred);
1834 if (error)
1835 return (error);
1836
1837 MAC_CHECK(check_vnode_getextattr, cred, vp, &vp->v_label,
1838 attrnamespace, name, uio);
1839 return (error);
1840}
1841
1842int
1843mac_check_vnode_link(struct ucred *cred, struct vnode *dvp,
1844 struct vnode *vp, struct componentname *cnp)
1845{
1846
1847 int error;
1848
1849 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_link");
1850 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_link");
1851
1852 if (!mac_enforce_fs)
1853 return (0);
1854
1855 error = vn_refreshlabel(dvp, cred);
1856 if (error)
1857 return (error);
1858
1859 error = vn_refreshlabel(vp, cred);
1860 if (error)
1861 return (error);
1862
1863 MAC_CHECK(check_vnode_link, cred, dvp, &dvp->v_label, vp,
1864 &vp->v_label, cnp);
1865 return (error);
1866}
1867
1868int
1869mac_check_vnode_lookup(struct ucred *cred, struct vnode *dvp,
1870 struct componentname *cnp)
1871{
1872 int error;
1873
1874 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_lookup");
1875
1876 if (!mac_enforce_fs)
1877 return (0);
1878
1879 error = vn_refreshlabel(dvp, cred);
1880 if (error)
1881 return (error);
1882
1883 MAC_CHECK(check_vnode_lookup, cred, dvp, &dvp->v_label, cnp);
1884 return (error);
1885}
1886
1887vm_prot_t
1888mac_check_vnode_mmap_prot(struct ucred *cred, struct vnode *vp, int newmapping)
1889{
1890 vm_prot_t result = VM_PROT_ALL;
1891
1892 if (!mac_enforce_vm)
1893 return (result);
1894
1895 /*
1896 * This should be some sort of MAC_BITWISE, maybe :)
1897 */
1898 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mmap_perms");
1899 MAC_BOOLEAN(check_vnode_mmap_perms, &, cred, vp, &vp->v_label,
1900 newmapping);
1901 return (result);
1902}
1903
1904int
1905mac_check_vnode_open(struct ucred *cred, struct vnode *vp, mode_t acc_mode)
1906{
1907 int error;
1908
1909 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_open");
1910
1911 if (!mac_enforce_fs)
1912 return (0);
1913
1914 error = vn_refreshlabel(vp, cred);
1915 if (error)
1916 return (error);
1917
1918 MAC_CHECK(check_vnode_open, cred, vp, &vp->v_label, acc_mode);
1919 return (error);
1920}
1921
1922int
1923mac_check_vnode_poll(struct ucred *active_cred, struct ucred *file_cred,
1924 struct vnode *vp)
1925{
1926 int error;
1927
1928 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_poll");
1929
1930 if (!mac_enforce_fs)
1931 return (0);
1932
1933 error = vn_refreshlabel(vp, active_cred);
1934 if (error)
1935 return (error);
1936
1937 MAC_CHECK(check_vnode_poll, active_cred, file_cred, vp,
1938 &vp->v_label);
1939
1940 return (error);
1941}
1942
1943int
1944mac_check_vnode_read(struct ucred *active_cred, struct ucred *file_cred,
1945 struct vnode *vp)
1946{
1947 int error;
1948
1949 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_read");
1950
1951 if (!mac_enforce_fs)
1952 return (0);
1953
1954 error = vn_refreshlabel(vp, active_cred);
1955 if (error)
1956 return (error);
1957
1958 MAC_CHECK(check_vnode_read, active_cred, file_cred, vp,
1959 &vp->v_label);
1960
1961 return (error);
1962}
1963
1964int
1965mac_check_vnode_readdir(struct ucred *cred, struct vnode *dvp)
1966{
1967 int error;
1968
1969 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_readdir");
1970
1971 if (!mac_enforce_fs)
1972 return (0);
1973
1974 error = vn_refreshlabel(dvp, cred);
1975 if (error)
1976 return (error);
1977
1978 MAC_CHECK(check_vnode_readdir, cred, dvp, &dvp->v_label);
1979 return (error);
1980}
1981
1982int
1983mac_check_vnode_readlink(struct ucred *cred, struct vnode *vp)
1984{
1985 int error;
1986
1987 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_readlink");
1988
1989 if (!mac_enforce_fs)
1990 return (0);
1991
1992 error = vn_refreshlabel(vp, cred);
1993 if (error)
1994 return (error);
1995
1996 MAC_CHECK(check_vnode_readlink, cred, vp, &vp->v_label);
1997 return (error);
1998}
1999
2000static int
2001mac_check_vnode_relabel(struct ucred *cred, struct vnode *vp,
2002 struct label *newlabel)
2003{
2004 int error;
2005
2006 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_relabel");
2007
2008 error = vn_refreshlabel(vp, cred);
2009 if (error)
2010 return (error);
2011
2012 MAC_CHECK(check_vnode_relabel, cred, vp, &vp->v_label, newlabel);
2013
2014 return (error);
2015}
2016
2017int
2018mac_check_vnode_rename_from(struct ucred *cred, struct vnode *dvp,
2019 struct vnode *vp, struct componentname *cnp)
2020{
2021 int error;
2022
2023 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_rename_from");
2024 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_rename_from");
2025
2026 if (!mac_enforce_fs)
2027 return (0);
2028
2029 error = vn_refreshlabel(dvp, cred);
2030 if (error)
2031 return (error);
2032 error = vn_refreshlabel(vp, cred);
2033 if (error)
2034 return (error);
2035
2036 MAC_CHECK(check_vnode_rename_from, cred, dvp, &dvp->v_label, vp,
2037 &vp->v_label, cnp);
2038 return (error);
2039}
2040
2041int
2042mac_check_vnode_rename_to(struct ucred *cred, struct vnode *dvp,
2043 struct vnode *vp, int samedir, struct componentname *cnp)
2044{
2045 int error;
2046
2047 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_rename_to");
2048 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_rename_to");
2049
2050 if (!mac_enforce_fs)
2051 return (0);
2052
2053 error = vn_refreshlabel(dvp, cred);
2054 if (error)
2055 return (error);
2056 if (vp != NULL) {
2057 error = vn_refreshlabel(vp, cred);
2058 if (error)
2059 return (error);
2060 }
2061 MAC_CHECK(check_vnode_rename_to, cred, dvp, &dvp->v_label, vp,
2062 vp != NULL ? &vp->v_label : NULL, samedir, cnp);
2063 return (error);
2064}
2065
2066int
2067mac_check_vnode_revoke(struct ucred *cred, struct vnode *vp)
2068{
2069 int error;
2070
2071 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_revoke");
2072
2073 if (!mac_enforce_fs)
2074 return (0);
2075
2076 error = vn_refreshlabel(vp, cred);
2077 if (error)
2078 return (error);
2079
2080 MAC_CHECK(check_vnode_revoke, cred, vp, &vp->v_label);
2081 return (error);
2082}
2083
2084int
2085mac_check_vnode_setacl(struct ucred *cred, struct vnode *vp, acl_type_t type,
2086 struct acl *acl)
2087{
2088 int error;
2089
2090 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setacl");
2091
2092 if (!mac_enforce_fs)
2093 return (0);
2094
2095 error = vn_refreshlabel(vp, cred);
2096 if (error)
2097 return (error);
2098
2099 MAC_CHECK(check_vnode_setacl, cred, vp, &vp->v_label, type, acl);
2100 return (error);
2101}
2102
2103int
2104mac_check_vnode_setextattr(struct ucred *cred, struct vnode *vp,
2105 int attrnamespace, const char *name, struct uio *uio)
2106{
2107 int error;
2108
2109 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setextattr");
2110
2111 if (!mac_enforce_fs)
2112 return (0);
2113
2114 error = vn_refreshlabel(vp, cred);
2115 if (error)
2116 return (error);
2117
2118 MAC_CHECK(check_vnode_setextattr, cred, vp, &vp->v_label,
2119 attrnamespace, name, uio);
2120 return (error);
2121}
2122
2123int
2124mac_check_vnode_setflags(struct ucred *cred, struct vnode *vp, u_long flags)
2125{
2126 int error;
2127
2128 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setflags");
2129
2130 if (!mac_enforce_fs)
2131 return (0);
2132
2133 error = vn_refreshlabel(vp, cred);
2134 if (error)
2135 return (error);
2136
2137 MAC_CHECK(check_vnode_setflags, cred, vp, &vp->v_label, flags);
2138 return (error);
2139}
2140
2141int
2142mac_check_vnode_setmode(struct ucred *cred, struct vnode *vp, mode_t mode)
2143{
2144 int error;
2145
2146 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setmode");
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_setmode, cred, vp, &vp->v_label, mode);
2156 return (error);
2157}
2158
2159int
2160mac_check_vnode_setowner(struct ucred *cred, struct vnode *vp, uid_t uid,
2161 gid_t gid)
2162{
2163 int error;
2164
2165 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setowner");
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_setowner, cred, vp, &vp->v_label, uid, gid);
2175 return (error);
2176}
2177
2178int
2179mac_check_vnode_setutimes(struct ucred *cred, struct vnode *vp,
2180 struct timespec atime, struct timespec mtime)
2181{
2182 int error;
2183
2184 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setutimes");
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_setutimes, cred, vp, &vp->v_label, atime,
2194 mtime);
2195 return (error);
2196}
2197
2198int
2199mac_check_vnode_stat(struct ucred *active_cred, struct ucred *file_cred,
2200 struct vnode *vp)
2201{
2202 int error;
2203
2204 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_stat");
2205
2206 if (!mac_enforce_fs)
2207 return (0);
2208
2209 error = vn_refreshlabel(vp, active_cred);
2210 if (error)
2211 return (error);
2212
2213 MAC_CHECK(check_vnode_stat, active_cred, file_cred, vp,
2214 &vp->v_label);
2215 return (error);
2216}
2217
2218int
2219mac_check_vnode_write(struct ucred *active_cred, struct ucred *file_cred,
2220 struct vnode *vp)
2221{
2222 int error;
2223
2224 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_write");
2225
2226 if (!mac_enforce_fs)
2227 return (0);
2228
2229 error = vn_refreshlabel(vp, active_cred);
2230 if (error)
2231 return (error);
2232
2233 MAC_CHECK(check_vnode_write, active_cred, file_cred, vp,
2234 &vp->v_label);
2235
2236 return (error);
2237}
2238
2239/*
2240 * When relabeling a process, call out to the policies for the maximum
2241 * permission allowed for each object type we know about in its
2242 * memory space, and revoke access (in the least surprising ways we
2243 * know) when necessary. The process lock is not held here.
2244 */
2245static void
2246mac_cred_mmapped_drop_perms(struct thread *td, struct ucred *cred)
2247{
2248
2249 /* XXX freeze all other threads */
2250 mac_cred_mmapped_drop_perms_recurse(td, cred,
2251 &td->td_proc->p_vmspace->vm_map);
2252 /* XXX allow other threads to continue */
2253}
2254
2255static __inline const char *
2256prot2str(vm_prot_t prot)
2257{
2258
2259 switch (prot & VM_PROT_ALL) {
2260 case VM_PROT_READ:
2261 return ("r--");
2262 case VM_PROT_READ | VM_PROT_WRITE:
2263 return ("rw-");
2264 case VM_PROT_READ | VM_PROT_EXECUTE:
2265 return ("r-x");
2266 case VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE:
2267 return ("rwx");
2268 case VM_PROT_WRITE:
2269 return ("-w-");
2270 case VM_PROT_EXECUTE:
2271 return ("--x");
2272 case VM_PROT_WRITE | VM_PROT_EXECUTE:
2273 return ("-wx");
2274 default:
2275 return ("---");
2276 }
2277}
2278
2279static void
2280mac_cred_mmapped_drop_perms_recurse(struct thread *td, struct ucred *cred,
2281 struct vm_map *map)
2282{
2283 struct vm_map_entry *vme;
2284 vm_prot_t result, revokeperms;
2285 vm_object_t object;
2286 vm_ooffset_t offset;
2287 struct vnode *vp;
2288
2289 if (!mac_mmap_revocation)
2290 return;
2291
2292 vm_map_lock_read(map);
2293 for (vme = map->header.next; vme != &map->header; vme = vme->next) {
2294 if (vme->eflags & MAP_ENTRY_IS_SUB_MAP) {
2295 mac_cred_mmapped_drop_perms_recurse(td, cred,
2296 vme->object.sub_map);
2297 continue;
2298 }
2299 /*
2300 * Skip over entries that obviously are not shared.
2301 */
2302 if (vme->eflags & (MAP_ENTRY_COW | MAP_ENTRY_NOSYNC) ||
2303 !vme->max_protection)
2304 continue;
2305 /*
2306 * Drill down to the deepest backing object.
2307 */
2308 offset = vme->offset;
2309 object = vme->object.vm_object;
2310 if (object == NULL)
2311 continue;
2312 while (object->backing_object != NULL) {
2313 object = object->backing_object;
2314 offset += object->backing_object_offset;
2315 }
2316 /*
2317 * At the moment, vm_maps and objects aren't considered
2318 * by the MAC system, so only things with backing by a
2319 * normal object (read: vnodes) are checked.
2320 */
2321 if (object->type != OBJT_VNODE)
2322 continue;
2323 vp = (struct vnode *)object->handle;
2324 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
2325 result = mac_check_vnode_mmap_prot(cred, vp, 0);
2326 VOP_UNLOCK(vp, 0, td);
2327 /*
2328 * Find out what maximum protection we may be allowing
2329 * now but a policy needs to get removed.
2330 */
2331 revokeperms = vme->max_protection & ~result;
2332 if (!revokeperms)
2333 continue;
2334 printf("pid %ld: revoking %s perms from %#lx:%ld "
2335 "(max %s/cur %s)\n", (long)td->td_proc->p_pid,
2336 prot2str(revokeperms), (u_long)vme->start,
2337 (long)(vme->end - vme->start),
2338 prot2str(vme->max_protection), prot2str(vme->protection));
2339 vm_map_lock_upgrade(map);
2340 /*
2341 * This is the really simple case: if a map has more
2342 * max_protection than is allowed, but it's not being
2343 * actually used (that is, the current protection is
2344 * still allowed), we can just wipe it out and do
2345 * nothing more.
2346 */
2347 if ((vme->protection & revokeperms) == 0) {
2348 vme->max_protection -= revokeperms;
2349 } else {
2350 if (revokeperms & VM_PROT_WRITE) {
2351 /*
2352 * In the more complicated case, flush out all
2353 * pending changes to the object then turn it
2354 * copy-on-write.
2355 */
2356 vm_object_reference(object);
2357 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
2358 vm_object_page_clean(object,
2359 OFF_TO_IDX(offset),
2360 OFF_TO_IDX(offset + vme->end - vme->start +
2361 PAGE_MASK),
2362 OBJPC_SYNC);
2363 VOP_UNLOCK(vp, 0, td);
2364 vm_object_deallocate(object);
2365 /*
2366 * Why bother if there's no read permissions
2367 * anymore? For the rest, we need to leave
2368 * the write permissions on for COW, or
2369 * remove them entirely if configured to.
2370 */
2371 if (!mac_mmap_revocation_via_cow) {
2372 vme->max_protection &= ~VM_PROT_WRITE;
2373 vme->protection &= ~VM_PROT_WRITE;
2374 } if ((revokeperms & VM_PROT_READ) == 0)
2375 vme->eflags |= MAP_ENTRY_COW |
2376 MAP_ENTRY_NEEDS_COPY;
2377 }
2378 if (revokeperms & VM_PROT_EXECUTE) {
2379 vme->max_protection &= ~VM_PROT_EXECUTE;
2380 vme->protection &= ~VM_PROT_EXECUTE;
2381 }
2382 if (revokeperms & VM_PROT_READ) {
2383 vme->max_protection = 0;
2384 vme->protection = 0;
2385 }
2386 pmap_protect(map->pmap, vme->start, vme->end,
2387 vme->protection & ~revokeperms);
2388 vm_map_simplify_entry(map, vme);
2389 }
2390 vm_map_lock_downgrade(map);
2391 }
2392 vm_map_unlock_read(map);
2393}
2394
2395/*
2396 * When the subject's label changes, it may require revocation of privilege
2397 * to mapped objects. This can't be done on-the-fly later with a unified
2398 * buffer cache.
2399 */
2400static void
2401mac_relabel_cred(struct ucred *cred, struct label *newlabel)
2402{
2403
2404 MAC_PERFORM(relabel_cred, cred, newlabel);
2405}
2406
2407void
2408mac_relabel_vnode(struct ucred *cred, struct vnode *vp, struct label *newlabel)
2409{
2410
2411 MAC_PERFORM(relabel_vnode, cred, vp, &vp->v_label, newlabel);
2412}
2413
2414void
2415mac_create_ifnet(struct ifnet *ifnet)
2416{
2417
2418 MAC_PERFORM(create_ifnet, ifnet, &ifnet->if_label);
2419}
2420
2421void
2422mac_create_bpfdesc(struct ucred *cred, struct bpf_d *bpf_d)
2423{
2424
2425 MAC_PERFORM(create_bpfdesc, cred, bpf_d, &bpf_d->bd_label);
2426}
2427
2428void
2429mac_create_socket(struct ucred *cred, struct socket *socket)
2430{
2431
2432 MAC_PERFORM(create_socket, cred, socket, &socket->so_label);
2433}
2434
2435void
2436mac_create_pipe(struct ucred *cred, struct pipe *pipe)
2437{
2438
2439 MAC_PERFORM(create_pipe, cred, pipe, pipe->pipe_label);
2440}
2441
2442void
2443mac_create_socket_from_socket(struct socket *oldsocket,
2444 struct socket *newsocket)
2445{
2446
2447 MAC_PERFORM(create_socket_from_socket, oldsocket, &oldsocket->so_label,
2448 newsocket, &newsocket->so_label);
2449}
2450
2451static void
2452mac_relabel_socket(struct ucred *cred, struct socket *socket,
2453 struct label *newlabel)
2454{
2455
2456 MAC_PERFORM(relabel_socket, cred, socket, &socket->so_label, newlabel);
2457}
2458
2459static void
2460mac_relabel_pipe(struct ucred *cred, struct pipe *pipe, struct label *newlabel)
2461{
2462
2463 MAC_PERFORM(relabel_pipe, cred, pipe, pipe->pipe_label, newlabel);
2464}
2465
2466void
2467mac_set_socket_peer_from_mbuf(struct mbuf *mbuf, struct socket *socket)
2468{
2469
2470 MAC_PERFORM(set_socket_peer_from_mbuf, mbuf, &mbuf->m_pkthdr.label,
2471 socket, &socket->so_peerlabel);
2472}
2473
2474void
2475mac_set_socket_peer_from_socket(struct socket *oldsocket,
2476 struct socket *newsocket)
2477{
2478
2479 MAC_PERFORM(set_socket_peer_from_socket, oldsocket,
2480 &oldsocket->so_label, newsocket, &newsocket->so_peerlabel);
2481}
2482
2483void
2484mac_create_datagram_from_ipq(struct ipq *ipq, struct mbuf *datagram)
2485{
2486
2487 MAC_PERFORM(create_datagram_from_ipq, ipq, &ipq->ipq_label,
2488 datagram, &datagram->m_pkthdr.label);
2489}
2490
2491void
2492mac_create_fragment(struct mbuf *datagram, struct mbuf *fragment)
2493{
2494
2495 MAC_PERFORM(create_fragment, datagram, &datagram->m_pkthdr.label,
2496 fragment, &fragment->m_pkthdr.label);
2497}
2498
2499void
2500mac_create_ipq(struct mbuf *fragment, struct ipq *ipq)
2501{
2502
2503 MAC_PERFORM(create_ipq, fragment, &fragment->m_pkthdr.label, ipq,
2504 &ipq->ipq_label);
2505}
2506
2507void
2508mac_create_mbuf_from_mbuf(struct mbuf *oldmbuf, struct mbuf *newmbuf)
2509{
2510
2511 MAC_PERFORM(create_mbuf_from_mbuf, oldmbuf, &oldmbuf->m_pkthdr.label,
2512 newmbuf, &newmbuf->m_pkthdr.label);
2513}
2514
2515void
2516mac_create_mbuf_from_bpfdesc(struct bpf_d *bpf_d, struct mbuf *mbuf)
2517{
2518
2519 MAC_PERFORM(create_mbuf_from_bpfdesc, bpf_d, &bpf_d->bd_label, mbuf,
2520 &mbuf->m_pkthdr.label);
2521}
2522
2523void
2524mac_create_mbuf_linklayer(struct ifnet *ifnet, struct mbuf *mbuf)
2525{
2526
2527 MAC_PERFORM(create_mbuf_linklayer, ifnet, &ifnet->if_label, mbuf,
2528 &mbuf->m_pkthdr.label);
2529}
2530
2531void
2532mac_create_mbuf_from_ifnet(struct ifnet *ifnet, struct mbuf *mbuf)
2533{
2534
2535 MAC_PERFORM(create_mbuf_from_ifnet, ifnet, &ifnet->if_label, mbuf,
2536 &mbuf->m_pkthdr.label);
2537}
2538
2539void
2540mac_create_mbuf_multicast_encap(struct mbuf *oldmbuf, struct ifnet *ifnet,
2541 struct mbuf *newmbuf)
2542{
2543
2544 MAC_PERFORM(create_mbuf_multicast_encap, oldmbuf,
2545 &oldmbuf->m_pkthdr.label, ifnet, &ifnet->if_label, newmbuf,
2546 &newmbuf->m_pkthdr.label);
2547}
2548
2549void
2550mac_create_mbuf_netlayer(struct mbuf *oldmbuf, struct mbuf *newmbuf)
2551{
2552
2553 MAC_PERFORM(create_mbuf_netlayer, oldmbuf, &oldmbuf->m_pkthdr.label,
2554 newmbuf, &newmbuf->m_pkthdr.label);
2555}
2556
2557int
2558mac_fragment_match(struct mbuf *fragment, struct ipq *ipq)
2559{
2560 int result;
2561
2562 result = 1;
2563 MAC_BOOLEAN(fragment_match, &&, fragment, &fragment->m_pkthdr.label,
2564 ipq, &ipq->ipq_label);
2565
2566 return (result);
2567}
2568
2569void
2570mac_update_ipq(struct mbuf *fragment, struct ipq *ipq)
2571{
2572
2573 MAC_PERFORM(update_ipq, fragment, &fragment->m_pkthdr.label, ipq,
2574 &ipq->ipq_label);
2575}
2576
2577void
2578mac_create_mbuf_from_socket(struct socket *socket, struct mbuf *mbuf)
2579{
2580
2581 MAC_PERFORM(create_mbuf_from_socket, socket, &socket->so_label, mbuf,
2582 &mbuf->m_pkthdr.label);
2583}
2584
2585void
2586mac_create_mount(struct ucred *cred, struct mount *mp)
2587{
2588
2589 MAC_PERFORM(create_mount, cred, mp, &mp->mnt_mntlabel,
2590 &mp->mnt_fslabel);
2591}
2592
2593void
2594mac_create_root_mount(struct ucred *cred, struct mount *mp)
2595{
2596
2597 MAC_PERFORM(create_root_mount, cred, mp, &mp->mnt_mntlabel,
2598 &mp->mnt_fslabel);
2599}
2600
2601int
2602mac_check_bpfdesc_receive(struct bpf_d *bpf_d, struct ifnet *ifnet)
2603{
2604 int error;
2605
2606 if (!mac_enforce_network)
2607 return (0);
2608
2609 MAC_CHECK(check_bpfdesc_receive, bpf_d, &bpf_d->bd_label, ifnet,
2610 &ifnet->if_label);
2611
2612 return (error);
2613}
2614
2615static int
2616mac_check_cred_relabel(struct ucred *cred, struct label *newlabel)
2617{
2618 int error;
2619
2620 MAC_CHECK(check_cred_relabel, cred, newlabel);
2621
2622 return (error);
2623}
2624
2625int
2626mac_check_cred_visible(struct ucred *u1, struct ucred *u2)
2627{
2628 int error;
2629
2630 if (!mac_enforce_process)
2631 return (0);
2632
2633 MAC_CHECK(check_cred_visible, u1, u2);
2634
2635 return (error);
2636}
2637
2638int
2639mac_check_ifnet_transmit(struct ifnet *ifnet, struct mbuf *mbuf)
2640{
2641 int error;
2642
2643 if (!mac_enforce_network)
2644 return (0);
2645
2646 KASSERT(mbuf->m_flags & M_PKTHDR, ("packet has no pkthdr"));
2647 if (!(mbuf->m_pkthdr.label.l_flags & MAC_FLAG_INITIALIZED))
2648 printf("%s%d: not initialized\n", ifnet->if_name,
2649 ifnet->if_unit);
2650
2651 MAC_CHECK(check_ifnet_transmit, ifnet, &ifnet->if_label, mbuf,
2652 &mbuf->m_pkthdr.label);
2653
2654 return (error);
2655}
2656
2657int
2658mac_check_mount_stat(struct ucred *cred, struct mount *mount)
2659{
2660 int error;
2661
2662 if (!mac_enforce_fs)
2663 return (0);
2664
2665 MAC_CHECK(check_mount_stat, cred, mount, &mount->mnt_mntlabel);
2666
2667 return (error);
2668}
2669
2670int
2671mac_check_pipe_ioctl(struct ucred *cred, struct pipe *pipe, unsigned long cmd,
2672 void *data)
2673{
2674 int error;
2675
2676 PIPE_LOCK_ASSERT(pipe, MA_OWNED);
2677
2678 if (!mac_enforce_pipe)
2679 return (0);
2680
2681 MAC_CHECK(check_pipe_ioctl, cred, pipe, pipe->pipe_label, cmd, data);
2682
2683 return (error);
2684}
2685
2686int
2687mac_check_pipe_poll(struct ucred *cred, struct pipe *pipe)
2688{
2689 int error;
2690
2691 PIPE_LOCK_ASSERT(pipe, MA_OWNED);
2692
2693 if (!mac_enforce_pipe)
2694 return (0);
2695
2696 MAC_CHECK(check_pipe_poll, cred, pipe, pipe->pipe_label);
2697
2698 return (error);
2699}
2700
2701int
2702mac_check_pipe_read(struct ucred *cred, struct pipe *pipe)
2703{
2704 int error;
2705
2706 PIPE_LOCK_ASSERT(pipe, MA_OWNED);
2707
2708 if (!mac_enforce_pipe)
2709 return (0);
2710
2711 MAC_CHECK(check_pipe_read, cred, pipe, pipe->pipe_label);
2712
2713 return (error);
2714}
2715
2716static int
2717mac_check_pipe_relabel(struct ucred *cred, struct pipe *pipe,
2718 struct label *newlabel)
2719{
2720 int error;
2721
2722 PIPE_LOCK_ASSERT(pipe, MA_OWNED);
2723
2724 if (!mac_enforce_pipe)
2725 return (0);
2726
2727 MAC_CHECK(check_pipe_relabel, cred, pipe, pipe->pipe_label, newlabel);
2728
2729 return (error);
2730}
2731
2732int
2733mac_check_pipe_stat(struct ucred *cred, struct pipe *pipe)
2734{
2735 int error;
2736
2737 PIPE_LOCK_ASSERT(pipe, MA_OWNED);
2738
2739 if (!mac_enforce_pipe)
2740 return (0);
2741
2742 MAC_CHECK(check_pipe_stat, cred, pipe, pipe->pipe_label);
2743
2744 return (error);
2745}
2746
2747int
2748mac_check_pipe_write(struct ucred *cred, struct pipe *pipe)
2749{
2750 int error;
2751
2752 PIPE_LOCK_ASSERT(pipe, MA_OWNED);
2753
2754 if (!mac_enforce_pipe)
2755 return (0);
2756
2757 MAC_CHECK(check_pipe_write, cred, pipe, pipe->pipe_label);
2758
2759 return (error);
2760}
2761
2762int
2763mac_check_proc_debug(struct ucred *cred, struct proc *proc)
2764{
2765 int error;
2766
2767 PROC_LOCK_ASSERT(proc, MA_OWNED);
2768
2769 if (!mac_enforce_process)
2770 return (0);
2771
2772 MAC_CHECK(check_proc_debug, cred, proc);
2773
2774 return (error);
2775}
2776
2777int
2778mac_check_proc_sched(struct ucred *cred, struct proc *proc)
2779{
2780 int error;
2781
2782 PROC_LOCK_ASSERT(proc, MA_OWNED);
2783
2784 if (!mac_enforce_process)
2785 return (0);
2786
2787 MAC_CHECK(check_proc_sched, cred, proc);
2788
2789 return (error);
2790}
2791
2792int
2793mac_check_proc_signal(struct ucred *cred, struct proc *proc, int signum)
2794{
2795 int error;
2796
2797 PROC_LOCK_ASSERT(proc, MA_OWNED);
2798
2799 if (!mac_enforce_process)
2800 return (0);
2801
2802 MAC_CHECK(check_proc_signal, cred, proc, signum);
2803
2804 return (error);
2805}
2806
2807int
2808mac_check_socket_bind(struct ucred *ucred, struct socket *socket,
2809 struct sockaddr *sockaddr)
2810{
2811 int error;
2812
2813 if (!mac_enforce_socket)
2814 return (0);
2815
2816 MAC_CHECK(check_socket_bind, ucred, socket, &socket->so_label,
2817 sockaddr);
2818
2819 return (error);
2820}
2821
2822int
2823mac_check_socket_connect(struct ucred *cred, struct socket *socket,
2824 struct sockaddr *sockaddr)
2825{
2826 int error;
2827
2828 if (!mac_enforce_socket)
2829 return (0);
2830
2831 MAC_CHECK(check_socket_connect, cred, socket, &socket->so_label,
2832 sockaddr);
2833
2834 return (error);
2835}
2836
2837int
2838mac_check_socket_deliver(struct socket *socket, struct mbuf *mbuf)
2839{
2840 int error;
2841
2842 if (!mac_enforce_socket)
2843 return (0);
2844
2845 MAC_CHECK(check_socket_deliver, socket, &socket->so_label, mbuf,
2846 &mbuf->m_pkthdr.label);
2847
2848 return (error);
2849}
2850
2851int
2852mac_check_socket_listen(struct ucred *cred, struct socket *socket)
2853{
2854 int error;
2855
2856 if (!mac_enforce_socket)
2857 return (0);
2858
2859 MAC_CHECK(check_socket_listen, cred, socket, &socket->so_label);
2860 return (error);
2861}
2862
2863static int
2864mac_check_socket_relabel(struct ucred *cred, struct socket *socket,
2865 struct label *newlabel)
2866{
2867 int error;
2868
2869 MAC_CHECK(check_socket_relabel, cred, socket, &socket->so_label,
2870 newlabel);
2871
2872 return (error);
2873}
2874
2875int
2876mac_check_socket_visible(struct ucred *cred, struct socket *socket)
2877{
2878 int error;
2879
2880 if (!mac_enforce_socket)
2881 return (0);
2882
2883 MAC_CHECK(check_socket_visible, cred, socket, &socket->so_label);
2884
2885 return (error);
2886}
2887
2888int
2889mac_ioctl_ifnet_get(struct ucred *cred, struct ifreq *ifr,
2890 struct ifnet *ifnet)
2891{
2892 struct mac label;
2893 int error;
2894
2895 error = mac_externalize(&ifnet->if_label, &label);
2896 if (error)
2897 return (error);
2898
2899 return (copyout(&label, ifr->ifr_ifru.ifru_data, sizeof(label)));
2900}
2901
2902int
2903mac_ioctl_ifnet_set(struct ucred *cred, struct ifreq *ifr,
2904 struct ifnet *ifnet)
2905{
2906 struct mac newlabel;
2907 struct label intlabel;
2908 int error;
2909
2910 error = copyin(ifr->ifr_ifru.ifru_data, &newlabel, sizeof(newlabel));
2911 if (error)
2912 return (error);
2913
2914 error = mac_internalize(&intlabel, &newlabel);
2915 if (error)
2916 return (error);
2917
2918 /*
2919 * XXX: Note that this is a redundant privilege check, since
2920 * policies impose this check themselves if required by the
2921 * policy. Eventually, this should go away.
2922 */
2923 error = suser_cred(cred, 0);
2924 if (error)
2925 goto out;
2926
2927 MAC_CHECK(check_ifnet_relabel, cred, ifnet, &ifnet->if_label,
2928 &intlabel);
2929 if (error)
2930 goto out;
2931
2932 MAC_PERFORM(relabel_ifnet, cred, ifnet, &ifnet->if_label, &intlabel);
2933
2934out:
2935 mac_destroy_temp(&intlabel);
2936 return (error);
2937}
2938
2939void
2940mac_create_devfs_vnode(struct devfs_dirent *de, struct vnode *vp)
2941{
2942
2943 MAC_PERFORM(create_devfs_vnode, de, &de->de_label, vp, &vp->v_label);
2944}
2945
2946void
2947mac_create_devfs_device(dev_t dev, struct devfs_dirent *de)
2948{
2949
2950 MAC_PERFORM(create_devfs_device, dev, de, &de->de_label);
2951}
2952
2953void
2954mac_create_devfs_symlink(struct ucred *cred, struct devfs_dirent *dd,
2955 struct devfs_dirent *de)
2956{
2957
2958 MAC_PERFORM(create_devfs_symlink, cred, dd, &dd->de_label, de,
2959 &de->de_label);
2960}
2961
2962static int
2963mac_stdcreatevnode_ea(struct vnode *vp)
2964{
2965 int error;
2966
2967 MAC_CHECK(stdcreatevnode_ea, vp, &vp->v_label);
2968
2969 return (error);
2970}
2971
2972void
2973mac_create_devfs_directory(char *dirname, int dirnamelen,
2974 struct devfs_dirent *de)
2975{
2976
2977 MAC_PERFORM(create_devfs_directory, dirname, dirnamelen, de,
2978 &de->de_label);
2979}
2980
2981/*
2982 * When a new vnode is created, this call will initialize its label.
2983 */
2984void
2985mac_create_vnode(struct ucred *cred, struct vnode *parent,
2986 struct vnode *child)
2987{
2988 int error;
2989
2990 ASSERT_VOP_LOCKED(parent, "mac_create_vnode");
2991 ASSERT_VOP_LOCKED(child, "mac_create_vnode");
2992
2993 error = vn_refreshlabel(parent, cred);
2994 if (error) {
2995 printf("mac_create_vnode: vn_refreshlabel returned %d\n",
2996 error);
2997 printf("mac_create_vnode: using old vnode label\n");
2998 }
2999
3000 MAC_PERFORM(create_vnode, cred, parent, &parent->v_label, child,
3001 &child->v_label);
3002}
3003
3004int
3005mac_setsockopt_label_set(struct ucred *cred, struct socket *so,
3006 struct mac *extmac)
3007{
3008 struct label intlabel;
3009 int error;
3010
3011 error = mac_internalize(&intlabel, extmac);
3012 if (error)
3013 return (error);
3014
3015 mac_check_socket_relabel(cred, so, &intlabel);
3016 if (error) {
3017 mac_destroy_temp(&intlabel);
3018 return (error);
3019 }
3020
3021 mac_relabel_socket(cred, so, &intlabel);
3022
3023 mac_destroy_temp(&intlabel);
3024 return (0);
3025}
3026
3027int
3028mac_pipe_label_set(struct ucred *cred, struct pipe *pipe, struct label *label)
3029{
3030 int error;
3031
3032 PIPE_LOCK_ASSERT(pipe, MA_OWNED);
3033
3034 error = mac_check_pipe_relabel(cred, pipe, label);
3035 if (error)
3036 return (error);
3037
3038 mac_relabel_pipe(cred, pipe, label);
3039
3040 return (0);
3041}
3042
3043int
3044mac_getsockopt_label_get(struct ucred *cred, struct socket *so,
3045 struct mac *extmac)
3046{
3047
3048 return (mac_externalize(&so->so_label, extmac));
3049}
3050
3051int
3052mac_getsockopt_peerlabel_get(struct ucred *cred, struct socket *so,
3053 struct mac *extmac)
3054{
3055
3056 return (mac_externalize(&so->so_peerlabel, extmac));
3057}
3058
3059/*
3060 * Implementation of VOP_SETLABEL() that relies on extended attributes
3061 * to store label data. Can be referenced by filesystems supporting
3062 * extended attributes.
3063 */
3064int
3065vop_stdsetlabel_ea(struct vop_setlabel_args *ap)
3066{
3067 struct vnode *vp = ap->a_vp;
3068 struct label *intlabel = ap->a_label;
3069 struct mac extmac;
3070 int error;
3071
3072 ASSERT_VOP_LOCKED(vp, "vop_stdsetlabel_ea");
3073
3074 /*
3075 * XXX: Eventually call out to EA check/set calls here.
3076 * Be particularly careful to avoid race conditions,
3077 * consistency problems, and stability problems when
3078 * dealing with multiple EAs. In particular, we require
3079 * the ability to write multiple EAs on the same file in
3080 * a single transaction, which the current EA interface
3081 * does not provide.
3082 */
3083
3084 error = mac_externalize(intlabel, &extmac);
3085 if (error)
3086 return (error);
3087
3088 error = vn_extattr_set(vp, IO_NODELOCKED,
3089 FREEBSD_MAC_EXTATTR_NAMESPACE, FREEBSD_MAC_EXTATTR_NAME,
3090 sizeof(extmac), (char *)&extmac, curthread);
3091 if (error)
3092 return (error);
3093
3094 mac_relabel_vnode(ap->a_cred, vp, intlabel);
3095
3096 vp->v_vflag |= VV_CACHEDLABEL;
3097
3098 return (0);
3099}
3100
3101static int
3102vn_setlabel(struct vnode *vp, struct label *intlabel, struct ucred *cred)
3103{
3104 int error;
3105
3106 if (vp->v_mount == NULL) {
3107 /* printf("vn_setlabel: null v_mount\n"); */
3108 if (vp->v_type != VNON)
3109 printf("vn_setlabel: null v_mount with non-VNON\n");
3110 return (EBADF);
3111 }
3112
3113 if ((vp->v_mount->mnt_flag & MNT_MULTILABEL) == 0)
3114 return (EOPNOTSUPP);
3115
3116 /*
3117 * Multi-phase commit. First check the policies to confirm the
3118 * change is OK. Then commit via the filesystem. Finally,
3119 * update the actual vnode label. Question: maybe the filesystem
3120 * should update the vnode at the end as part of VOP_SETLABEL()?
3121 */
3122 error = mac_check_vnode_relabel(cred, vp, intlabel);
3123 if (error)
3124 return (error);
3125
3126 /*
3127 * VADMIN provides the opportunity for the filesystem to make
3128 * decisions about who is and is not able to modify labels
3129 * and protections on files. This might not be right. We can't
3130 * assume VOP_SETLABEL() will do it, because we might implement
3131 * that as part of vop_stdsetlabel_ea().
3132 */
3133 error = VOP_ACCESS(vp, VADMIN, cred, curthread);
3134 if (error)
3135 return (error);
3136
3137 error = VOP_SETLABEL(vp, intlabel, cred, curthread);
3138 if (error)
3139 return (error);
3140
3141 return (0);
3142}
3143
3144/*
3145 * MPSAFE
3146 */
3147int
3148__mac_get_proc(struct thread *td, struct __mac_get_proc_args *uap)
3149{
3150 struct mac extmac;
3151 int error;
3152
3153 error = mac_externalize(&td->td_ucred->cr_label, &extmac);
3154 if (error == 0)
3155 error = copyout(&extmac, SCARG(uap, mac_p), sizeof(extmac));
3156
3157 return (error);
3158}
3159
3160/*
3161 * MPSAFE
3162 */
3163int
3164__mac_set_proc(struct thread *td, struct __mac_set_proc_args *uap)
3165{
3166 struct ucred *newcred, *oldcred;
3167 struct proc *p;
3168 struct mac extmac;
3169 struct label intlabel;
3170 int error;
3171
3172 error = copyin(SCARG(uap, mac_p), &extmac, sizeof(extmac));
3173 if (error)
3174 return (error);
3175
3176 error = mac_internalize(&intlabel, &extmac);
3177 if (error)
3178 return (error);
3179
3180 newcred = crget();
3181
3182 p = td->td_proc;
3183 PROC_LOCK(p);
3184 oldcred = p->p_ucred;
3185
3186 error = mac_check_cred_relabel(oldcred, &intlabel);
3187 if (error) {
3188 PROC_UNLOCK(p);
3189 mac_destroy_temp(&intlabel);
3190 crfree(newcred);
3191 return (error);
3192 }
3193
3194 setsugid(p);
3195 crcopy(newcred, oldcred);
3196 mac_relabel_cred(newcred, &intlabel);
3197 p->p_ucred = newcred;
3198
3199 /*
3200 * Grab additional reference for use while revoking mmaps, prior
3201 * to releasing the proc lock and sharing the cred.
3202 */
3203 crhold(newcred);
3204 PROC_UNLOCK(p);
3205
3206 mtx_lock(&Giant);
3207 mac_cred_mmapped_drop_perms(td, newcred);
3208 mtx_unlock(&Giant);
3209
3210 crfree(newcred); /* Free revocation reference. */
3211 crfree(oldcred);
3212 mac_destroy_temp(&intlabel);
3213 return (0);
3214}
3215
3216/*
3217 * MPSAFE
3218 */
3219int
3220__mac_get_fd(struct thread *td, struct __mac_get_fd_args *uap)
3221{
3222 struct file *fp;
3223 struct mac extmac;
3224 struct vnode *vp;
3225 struct pipe *pipe;
3226 int error;
3227
3228 mtx_lock(&Giant);
3229
3230 error = fget(td, SCARG(uap, fd), &fp);
3231 if (error)
3232 goto out;
3233
3234 switch (fp->f_type) {
3235 case DTYPE_FIFO:
3236 case DTYPE_VNODE:
3237 vp = (struct vnode *)fp->f_data;
3238
3239 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
3240 error = vn_refreshlabel(vp, td->td_ucred);
3241 if (error == 0)
3242 error = mac_externalize(&vp->v_label, &extmac);
3243 VOP_UNLOCK(vp, 0, td);
3244 break;
3245 case DTYPE_PIPE:
3246 pipe = (struct pipe *)fp->f_data;
3247 error = mac_externalize(pipe->pipe_label, &extmac);
3248 break;
3249 default:
3250 error = EINVAL;
3251 }
3252
3253 if (error == 0)
3254 error = copyout(&extmac, SCARG(uap, mac_p), sizeof(extmac));
3255
3256 fdrop(fp, td);
3257
3258out:
3259 mtx_unlock(&Giant);
3260 return (error);
3261}
3262
3263/*
3264 * MPSAFE
3265 */
3266int
3267__mac_get_file(struct thread *td, struct __mac_get_file_args *uap)
3268{
3269 struct nameidata nd;
3270 struct mac extmac;
3271 int error;
3272
3273 mtx_lock(&Giant);
3274 NDINIT(&nd, LOOKUP, LOCKLEAF | FOLLOW, UIO_USERSPACE,
3275 SCARG(uap, path_p), td);
3276 error = namei(&nd);
3277 if (error)
3278 goto out;
3279
3280 error = vn_refreshlabel(nd.ni_vp, td->td_ucred);
3281 if (error == 0)
3282 error = mac_externalize(&nd.ni_vp->v_label, &extmac);
3283 NDFREE(&nd, 0);
3284 if (error)
3285 goto out;
3286
3287 error = copyout(&extmac, SCARG(uap, mac_p), sizeof(extmac));
3288
3289out:
3290 mtx_unlock(&Giant);
3291 return (error);
3292}
3293
3294/*
3295 * MPSAFE
3296 */
3297int
3298__mac_set_fd(struct thread *td, struct __mac_set_fd_args *uap)
3299{
3300 struct file *fp;
3301 struct mac extmac;
3302 struct label intlabel;
3303 struct mount *mp;
3304 struct vnode *vp;
3305 struct pipe *pipe;
3306 int error;
3307
3308 mtx_lock(&Giant);
3309 error = fget(td, SCARG(uap, fd), &fp);
3310 if (error)
3311 goto out1;
3312
3313 error = copyin(SCARG(uap, mac_p), &extmac, sizeof(extmac));
3314 if (error)
3315 goto out2;
3316
3317 error = mac_internalize(&intlabel, &extmac);
3318 if (error)
3319 goto out2;
3320
3321 switch (fp->f_type) {
3322 case DTYPE_FIFO:
3323 case DTYPE_VNODE:
3324 vp = (struct vnode *)fp->f_data;
3325 error = vn_start_write(vp, &mp, V_WAIT | PCATCH);
3326 if (error != 0)
3327 break;
3328
3329 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
3330 error = vn_setlabel(vp, &intlabel, td->td_ucred);
3331 VOP_UNLOCK(vp, 0, td);
3332 vn_finished_write(mp);
3333 mac_destroy_temp(&intlabel);
3334 break;
3335 case DTYPE_PIPE:
3336 pipe = (struct pipe *)fp->f_data;
3337 PIPE_LOCK(pipe);
3338 error = mac_pipe_label_set(td->td_ucred, pipe, &intlabel);
3339 PIPE_UNLOCK(pipe);
3340 break;
3341 default:
3342 error = EINVAL;
3343 }
3344
3345out2:
3346 fdrop(fp, td);
3347out1:
3348 mtx_unlock(&Giant);
3349 return (error);
3350}
3351
3352/*
3353 * MPSAFE
3354 */
3355int
3356__mac_set_file(struct thread *td, struct __mac_set_file_args *uap)
3357{
3358 struct nameidata nd;
3359 struct mac extmac;
3360 struct label intlabel;
3361 struct mount *mp;
3362 int error;
3363
3364 mtx_lock(&Giant);
3365
3366 error = copyin(SCARG(uap, mac_p), &extmac, sizeof(extmac));
3367 if (error)
3368 goto out;
3369
3370 error = mac_internalize(&intlabel, &extmac);
3371 if (error)
3372 goto out;
3373
3374 NDINIT(&nd, LOOKUP, LOCKLEAF | FOLLOW, UIO_USERSPACE,
3375 SCARG(uap, path_p), td);
3376 error = namei(&nd);
3377 if (error)
3378 goto out2;
3379 error = vn_start_write(nd.ni_vp, &mp, V_WAIT | PCATCH);
3380 if (error)
3381 goto out2;
3382
3383 error = vn_setlabel(nd.ni_vp, &intlabel, td->td_ucred);
3384
3385 vn_finished_write(mp);
3386out2:
3387 mac_destroy_temp(&intlabel);
3388 NDFREE(&nd, 0);
3389out:
3390 mtx_unlock(&Giant);
3391 return (error);
3392}
3393
3394int
3395mac_syscall(struct thread *td, struct mac_syscall_args *uap)
3396{
3397 struct mac_policy_conf *mpc;
3398 char target[MAC_MAX_POLICY_NAME];
3399 int error;
3400
3401 error = copyinstr(SCARG(uap, policy), target, sizeof(target), NULL);
3402 if (error)
3403 return (error);
3404
3405 error = ENOSYS;
3406 MAC_POLICY_LIST_BUSY();
3407 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) {
3408 if (strcmp(mpc->mpc_name, target) == 0 &&
3409 mpc->mpc_ops->mpo_syscall != NULL) {
3410 error = mpc->mpc_ops->mpo_syscall(td,
3411 SCARG(uap, call), SCARG(uap, arg));
3412 goto out;
3413 }
3414 }
3415
3416out:
3417 MAC_POLICY_LIST_UNBUSY();
3418 return (error);
3419}
3420
3421SYSINIT(mac, SI_SUB_MAC, SI_ORDER_FIRST, mac_init, NULL);
3422SYSINIT(mac_late, SI_SUB_MAC_LATE, SI_ORDER_FIRST, mac_late_init, NULL);
3423
3424#else /* !MAC */
3425
3426int
3427__mac_get_proc(struct thread *td, struct __mac_get_proc_args *uap)
3428{
3429
3430 return (ENOSYS);
3431}
3432
3433int
3434__mac_set_proc(struct thread *td, struct __mac_set_proc_args *uap)
3435{
3436
3437 return (ENOSYS);
3438}
3439
3440int
3441__mac_get_fd(struct thread *td, struct __mac_get_fd_args *uap)
3442{
3443
3444 return (ENOSYS);
3445}
3446
3447int
3448__mac_get_file(struct thread *td, struct __mac_get_file_args *uap)
3449{
3450
3451 return (ENOSYS);
3452}
3453
3454int
3455__mac_set_fd(struct thread *td, struct __mac_set_fd_args *uap)
3456{
3457
3458 return (ENOSYS);
3459}
3460
3461int
3462__mac_set_file(struct thread *td, struct __mac_set_file_args *uap)
3463{
3464
3465 return (ENOSYS);
3466}
3467
3468int
3469mac_syscall(struct thread *td, struct mac_syscall_args *uap)
3470{
3471
3472 return (ENOSYS);
3473}
3474
3475#endif /* !MAC */