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 103570 2002-09-18 22:35:02Z 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
50#include <sys/param.h>
51#include <sys/extattr.h>
52#include <sys/kernel.h>
53#include <sys/lock.h>
54#include <sys/malloc.h>
55#include <sys/mutex.h>
56#include <sys/mac.h>
57#include <sys/module.h>
58#include <sys/proc.h>
59#include <sys/systm.h>
60#include <sys/sysproto.h>
61#include <sys/sysent.h>
62#include <sys/vnode.h>
63#include <sys/mount.h>
64#include <sys/file.h>
65#include <sys/namei.h>
66#include <sys/socket.h>
67#include <sys/pipe.h>
68#include <sys/socketvar.h>
69#include <sys/sysctl.h>
70
71#include <vm/vm.h>
72#include <vm/pmap.h>
73#include <vm/vm_map.h>
74#include <vm/vm_object.h>
75
76#include <sys/mac_policy.h>
77
78#include <fs/devfs/devfs.h>
79
80#include <net/bpfdesc.h>
81#include <net/if.h>
82#include <net/if_var.h>
83
84#include <netinet/in.h>
85#include <netinet/ip_var.h>
86
87#ifdef MAC
88
89/*
90 * Declare that the kernel provides MAC support, version 1. This permits
91 * modules to refuse to be loaded if the necessary support isn't present,
92 * even if it's pre-boot.
93 */
94MODULE_VERSION(kernel_mac_support, 1);
95
96SYSCTL_DECL(_security);
97
98SYSCTL_NODE(_security, OID_AUTO, mac, CTLFLAG_RW, 0,
99 "TrustedBSD MAC policy controls");
100SYSCTL_NODE(_security_mac, OID_AUTO, debug, CTLFLAG_RW, 0,
101 "TrustedBSD MAC debug info");
102
103static int mac_debug_label_fallback = 0;
104SYSCTL_INT(_security_mac_debug, OID_AUTO, label_fallback, CTLFLAG_RW,
105 &mac_debug_label_fallback, 0, "Filesystems should fall back to fs label"
106 "when label is corrupted.");
107TUNABLE_INT("security.mac.debug_label_fallback",
108 &mac_debug_label_fallback);
109
110#ifndef MAC_MAX_POLICIES
111#define MAC_MAX_POLICIES 8
112#endif
113#if MAC_MAX_POLICIES > 32
114#error "MAC_MAX_POLICIES too large"
115#endif
116static unsigned int mac_max_policies = MAC_MAX_POLICIES;
117static unsigned int mac_policy_offsets_free = (1 << MAC_MAX_POLICIES) - 1;
118SYSCTL_UINT(_security_mac, OID_AUTO, max_policies, CTLFLAG_RD,
119 &mac_max_policies, 0, "");
120
121static int mac_late = 0;
122
123static int mac_enforce_fs = 1;
124SYSCTL_INT(_security_mac, OID_AUTO, enforce_fs, CTLFLAG_RW,
125 &mac_enforce_fs, 0, "Enforce MAC policy on file system objects");
126TUNABLE_INT("security.mac.enforce_fs", &mac_enforce_fs);
127
128static int mac_enforce_network = 1;
129SYSCTL_INT(_security_mac, OID_AUTO, enforce_network, CTLFLAG_RW,
130 &mac_enforce_network, 0, "Enforce MAC policy on network packets");
131TUNABLE_INT("security.mac.enforce_network", &mac_enforce_network);
132
133static int mac_enforce_pipe = 1;
134SYSCTL_INT(_security_mac, OID_AUTO, enforce_pipe, CTLFLAG_RW,
135 &mac_enforce_pipe, 0, "Enforce MAC policy on pipe operations");
136
137static int mac_enforce_process = 1;
138SYSCTL_INT(_security_mac, OID_AUTO, enforce_process, CTLFLAG_RW,
139 &mac_enforce_process, 0, "Enforce MAC policy on inter-process operations");
140TUNABLE_INT("security.mac.enforce_process", &mac_enforce_process);
141
142static int mac_enforce_socket = 1;
143SYSCTL_INT(_security_mac, OID_AUTO, enforce_socket, CTLFLAG_RW,
144 &mac_enforce_socket, 0, "Enforce MAC policy on socket operations");
145TUNABLE_INT("security.mac.enforce_socket", &mac_enforce_socket);
146
147static int mac_enforce_vm = 1;
148SYSCTL_INT(_security_mac, OID_AUTO, enforce_vm, CTLFLAG_RW,
149 &mac_enforce_vm, 0, "Enforce MAC policy on vm operations");
150
151static int mac_label_size = sizeof(struct mac);
152SYSCTL_INT(_security_mac, OID_AUTO, label_size, CTLFLAG_RD,
153 &mac_label_size, 0, "Pre-compiled MAC label size");
154
155static int mac_cache_fslabel_in_vnode = 1;
156SYSCTL_INT(_security_mac, OID_AUTO, cache_fslabel_in_vnode, CTLFLAG_RW,
157 &mac_cache_fslabel_in_vnode, 0, "Cache mount fslabel in vnode");
158TUNABLE_INT("security.mac.cache_fslabel_in_vnode",
159 &mac_cache_fslabel_in_vnode);
160
161static int mac_vnode_label_cache_hits = 0;
162SYSCTL_INT(_security_mac, OID_AUTO, vnode_label_cache_hits, CTLFLAG_RD,
163 &mac_vnode_label_cache_hits, 0, "Cache hits on vnode labels");
164static int mac_vnode_label_cache_misses = 0;
165SYSCTL_INT(_security_mac, OID_AUTO, vnode_label_cache_misses, CTLFLAG_RD,
166 &mac_vnode_label_cache_misses, 0, "Cache misses on vnode labels");
167
168static int mac_mmap_revocation = 1;
169SYSCTL_INT(_security_mac, OID_AUTO, mmap_revocation, CTLFLAG_RW,
170 &mac_mmap_revocation, 0, "Revoke mmap access to files on subject "
171 "relabel");
172static int mac_mmap_revocation_via_cow = 0;
173SYSCTL_INT(_security_mac, OID_AUTO, mmap_revocation_via_cow, CTLFLAG_RW,
174 &mac_mmap_revocation_via_cow, 0, "Revoke mmap access to files via "
175 "copy-on-write semantics, or by removing all write access");
176
177#ifdef MAC_DEBUG
178static unsigned int nmacmbufs, nmaccreds, nmacifnets, nmacbpfdescs,
179 nmacsockets, nmacmounts, nmactemp, nmacvnodes, nmacdevfsdirents,
180 nmacipqs, nmacpipes;
181SYSCTL_UINT(_security_mac_debug, OID_AUTO, mbufs, CTLFLAG_RD,
182 &nmacmbufs, 0, "number of mbufs in use");
183SYSCTL_UINT(_security_mac_debug, OID_AUTO, creds, CTLFLAG_RD,
184 &nmaccreds, 0, "number of ucreds in use");
185SYSCTL_UINT(_security_mac_debug, OID_AUTO, ifnets, CTLFLAG_RD,
186 &nmacifnets, 0, "number of ifnets in use");
187SYSCTL_UINT(_security_mac_debug, OID_AUTO, ipqs, CTLFLAG_RD,
188 &nmacipqs, 0, "number of ipqs in use");
189SYSCTL_UINT(_security_mac_debug, OID_AUTO, bpfdescs, CTLFLAG_RD,
190 &nmacbpfdescs, 0, "number of bpfdescs in use");
191SYSCTL_UINT(_security_mac_debug, OID_AUTO, sockets, CTLFLAG_RD,
192 &nmacsockets, 0, "number of sockets in use");
193SYSCTL_UINT(_security_mac_debug, OID_AUTO, pipes, CTLFLAG_RD,
194 &nmacpipes, 0, "number of pipes in use");
195SYSCTL_UINT(_security_mac_debug, OID_AUTO, mounts, CTLFLAG_RD,
196 &nmacmounts, 0, "number of mounts in use");
197SYSCTL_UINT(_security_mac_debug, OID_AUTO, temp, CTLFLAG_RD,
198 &nmactemp, 0, "number of temporary labels in use");
199SYSCTL_UINT(_security_mac_debug, OID_AUTO, vnodes, CTLFLAG_RD,
200 &nmacvnodes, 0, "number of vnodes in use");
201SYSCTL_UINT(_security_mac_debug, OID_AUTO, devfsdirents, CTLFLAG_RD,
202 &nmacdevfsdirents, 0, "number of devfs dirents inuse");
203#endif
204
205static int error_select(int error1, int error2);
206static int mac_externalize(struct label *label, struct mac *mac);
207static int mac_policy_register(struct mac_policy_conf *mpc);
208static int mac_policy_unregister(struct mac_policy_conf *mpc);
209
210static int mac_stdcreatevnode_ea(struct vnode *vp);
211static void mac_cred_mmapped_drop_perms(struct thread *td,
212 struct ucred *cred);
213static void mac_cred_mmapped_drop_perms_recurse(struct thread *td,
214 struct ucred *cred, struct vm_map *map);
215
216MALLOC_DEFINE(M_MACOPVEC, "macopvec", "MAC policy operation vector");
217MALLOC_DEFINE(M_MACPIPELABEL, "macpipelabel", "MAC labels for pipes");
218
219/*
220 * mac_policy_list_lock protects the consistency of 'mac_policy_list',
221 * the linked list of attached policy modules. Read-only consumers of
222 * the list must acquire a shared lock for the duration of their use;
223 * writers must acquire an exclusive lock. Note that for compound
224 * operations, locks should be held for the entire compound operation,
225 * and that this is not yet done for relabel requests.
226 */
227static struct mtx mac_policy_list_lock;
228static LIST_HEAD(, mac_policy_conf) mac_policy_list;
229static int mac_policy_list_busy;
230#define MAC_POLICY_LIST_LOCKINIT() mtx_init(&mac_policy_list_lock, \
231 "mac_policy_list_lock", NULL, MTX_DEF);
232#define MAC_POLICY_LIST_LOCK() mtx_lock(&mac_policy_list_lock);
233#define MAC_POLICY_LIST_UNLOCK() mtx_unlock(&mac_policy_list_lock);
234
235#define MAC_POLICY_LIST_BUSY() do { \
236 MAC_POLICY_LIST_LOCK(); \
237 mac_policy_list_busy++; \
238 MAC_POLICY_LIST_UNLOCK(); \
239} while (0)
240
241#define MAC_POLICY_LIST_UNBUSY() do { \
242 MAC_POLICY_LIST_LOCK(); \
243 mac_policy_list_busy--; \
244 if (mac_policy_list_busy < 0) \
245 panic("Extra mac_policy_list_busy--"); \
246 MAC_POLICY_LIST_UNLOCK(); \
247} while (0)
248
249/*
250 * MAC_CHECK performs the designated check by walking the policy
251 * module list and checking with each as to how it feels about the
252 * request. Note that it returns its value via 'error' in the scope
253 * of the caller.
254 */
255#define MAC_CHECK(check, args...) do { \
256 struct mac_policy_conf *mpc; \
257 \
258 error = 0; \
259 MAC_POLICY_LIST_BUSY(); \
260 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \
261 if (mpc->mpc_ops->mpo_ ## check != NULL) \
262 error = error_select( \
263 mpc->mpc_ops->mpo_ ## check (args), \
264 error); \
265 } \
266 MAC_POLICY_LIST_UNBUSY(); \
267} while (0)
268
269/*
270 * MAC_BOOLEAN performs the designated boolean composition by walking
271 * the module list, invoking each instance of the operation, and
272 * combining the results using the passed C operator. Note that it
273 * returns its value via 'result' in the scope of the caller, which
274 * should be initialized by the caller in a meaningful way to get
275 * a meaningful result.
276 */
277#define MAC_BOOLEAN(operation, composition, args...) do { \
278 struct mac_policy_conf *mpc; \
279 \
280 MAC_POLICY_LIST_BUSY(); \
281 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \
282 if (mpc->mpc_ops->mpo_ ## operation != NULL) \
283 result = result composition \
284 mpc->mpc_ops->mpo_ ## operation (args); \
285 } \
286 MAC_POLICY_LIST_UNBUSY(); \
287} while (0)
288
289/*
290 * MAC_PERFORM performs the designated operation by walking the policy
291 * module list and invoking that operation for each policy.
292 */
293#define MAC_PERFORM(operation, args...) do { \
294 struct mac_policy_conf *mpc; \
295 \
296 MAC_POLICY_LIST_BUSY(); \
297 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \
298 if (mpc->mpc_ops->mpo_ ## operation != NULL) \
299 mpc->mpc_ops->mpo_ ## operation (args); \
300 } \
301 MAC_POLICY_LIST_UNBUSY(); \
302} while (0)
303
304/*
305 * Initialize the MAC subsystem, including appropriate SMP locks.
306 */
307static void
308mac_init(void)
309{
310
311 LIST_INIT(&mac_policy_list);
312 MAC_POLICY_LIST_LOCKINIT();
313}
314
315/*
316 * For the purposes of modules that want to know if they were loaded
317 * "early", set the mac_late flag once we've processed modules either
318 * linked into the kernel, or loaded before the kernel startup.
319 */
320static void
321mac_late_init(void)
322{
323
324 mac_late = 1;
325}
326
327/*
328 * Allow MAC policy modules to register during boot, etc.
329 */
330int
331mac_policy_modevent(module_t mod, int type, void *data)
332{
333 struct mac_policy_conf *mpc;
334 int error;
335
336 error = 0;
337 mpc = (struct mac_policy_conf *) data;
338
339 switch (type) {
340 case MOD_LOAD:
341 if (mpc->mpc_loadtime_flags & MPC_LOADTIME_FLAG_NOTLATE &&
342 mac_late) {
343 printf("mac_policy_modevent: can't load %s policy "
344 "after booting\n", mpc->mpc_name);
345 error = EBUSY;
346 break;
347 }
348 error = mac_policy_register(mpc);
349 break;
350 case MOD_UNLOAD:
351 /* Don't unregister the module if it was never registered. */
352 if ((mpc->mpc_runtime_flags & MPC_RUNTIME_FLAG_REGISTERED)
353 != 0)
354 error = mac_policy_unregister(mpc);
355 else
356 error = 0;
357 break;
358 default:
359 break;
360 }
361
362 return (error);
363}
364
365static int
366mac_policy_register(struct mac_policy_conf *mpc)
367{
368 struct mac_policy_conf *tmpc;
369 struct mac_policy_op_entry *mpe;
370 int slot;
371
372 MALLOC(mpc->mpc_ops, struct mac_policy_ops *, sizeof(*mpc->mpc_ops),
373 M_MACOPVEC, M_WAITOK | M_ZERO);
374 for (mpe = mpc->mpc_entries; mpe->mpe_constant != MAC_OP_LAST; mpe++) {
375 switch (mpe->mpe_constant) {
376 case MAC_OP_LAST:
377 /*
378 * Doesn't actually happen, but this allows checking
379 * that all enumerated values are handled.
380 */
381 break;
382 case MAC_DESTROY:
383 mpc->mpc_ops->mpo_destroy =
384 mpe->mpe_function;
385 break;
386 case MAC_INIT:
387 mpc->mpc_ops->mpo_init =
388 mpe->mpe_function;
389 break;
390 case MAC_SYSCALL:
391 mpc->mpc_ops->mpo_syscall =
392 mpe->mpe_function;
393 break;
394 case MAC_INIT_BPFDESC:
395 mpc->mpc_ops->mpo_init_bpfdesc =
396 mpe->mpe_function;
397 break;
398 case MAC_INIT_CRED:
399 mpc->mpc_ops->mpo_init_cred =
400 mpe->mpe_function;
401 break;
402 case MAC_INIT_DEVFSDIRENT:
403 mpc->mpc_ops->mpo_init_devfsdirent =
404 mpe->mpe_function;
405 break;
406 case MAC_INIT_IFNET:
407 mpc->mpc_ops->mpo_init_ifnet =
408 mpe->mpe_function;
409 break;
410 case MAC_INIT_IPQ:
411 mpc->mpc_ops->mpo_init_ipq =
412 mpe->mpe_function;
413 break;
414 case MAC_INIT_MBUF:
415 mpc->mpc_ops->mpo_init_mbuf =
416 mpe->mpe_function;
417 break;
418 case MAC_INIT_MOUNT:
419 mpc->mpc_ops->mpo_init_mount =
420 mpe->mpe_function;
421 break;
422 case MAC_INIT_PIPE:
423 mpc->mpc_ops->mpo_init_pipe =
424 mpe->mpe_function;
425 break;
426 case MAC_INIT_SOCKET:
427 mpc->mpc_ops->mpo_init_socket =
428 mpe->mpe_function;
429 break;
430 case MAC_INIT_TEMP:
431 mpc->mpc_ops->mpo_init_temp =
432 mpe->mpe_function;
433 break;
434 case MAC_INIT_VNODE:
435 mpc->mpc_ops->mpo_init_vnode =
436 mpe->mpe_function;
437 break;
438 case MAC_DESTROY_BPFDESC:
439 mpc->mpc_ops->mpo_destroy_bpfdesc =
440 mpe->mpe_function;
441 break;
442 case MAC_DESTROY_CRED:
443 mpc->mpc_ops->mpo_destroy_cred =
444 mpe->mpe_function;
445 break;
446 case MAC_DESTROY_DEVFSDIRENT:
447 mpc->mpc_ops->mpo_destroy_devfsdirent =
448 mpe->mpe_function;
449 break;
450 case MAC_DESTROY_IFNET:
451 mpc->mpc_ops->mpo_destroy_ifnet =
452 mpe->mpe_function;
453 break;
454 case MAC_DESTROY_IPQ:
455 mpc->mpc_ops->mpo_destroy_ipq =
456 mpe->mpe_function;
457 break;
458 case MAC_DESTROY_MBUF:
459 mpc->mpc_ops->mpo_destroy_mbuf =
460 mpe->mpe_function;
461 break;
462 case MAC_DESTROY_MOUNT:
463 mpc->mpc_ops->mpo_destroy_mount =
464 mpe->mpe_function;
465 break;
466 case MAC_DESTROY_PIPE:
467 mpc->mpc_ops->mpo_destroy_pipe =
468 mpe->mpe_function;
469 break;
470 case MAC_DESTROY_SOCKET:
471 mpc->mpc_ops->mpo_destroy_socket =
472 mpe->mpe_function;
473 break;
474 case MAC_DESTROY_TEMP:
475 mpc->mpc_ops->mpo_destroy_temp =
476 mpe->mpe_function;
477 break;
478 case MAC_DESTROY_VNODE:
479 mpc->mpc_ops->mpo_destroy_vnode =
480 mpe->mpe_function;
481 break;
482 case MAC_EXTERNALIZE:
483 mpc->mpc_ops->mpo_externalize =
484 mpe->mpe_function;
485 break;
486 case MAC_INTERNALIZE:
487 mpc->mpc_ops->mpo_internalize =
488 mpe->mpe_function;
489 break;
490 case MAC_CREATE_DEVFS_DEVICE:
491 mpc->mpc_ops->mpo_create_devfs_device =
492 mpe->mpe_function;
493 break;
494 case MAC_CREATE_DEVFS_DIRECTORY:
495 mpc->mpc_ops->mpo_create_devfs_directory =
496 mpe->mpe_function;
497 break;
498 case MAC_CREATE_DEVFS_VNODE:
499 mpc->mpc_ops->mpo_create_devfs_vnode =
500 mpe->mpe_function;
501 break;
502 case MAC_STDCREATEVNODE_EA:
503 mpc->mpc_ops->mpo_stdcreatevnode_ea =
504 mpe->mpe_function;
505 break;
506 case MAC_CREATE_VNODE:
507 mpc->mpc_ops->mpo_create_vnode =
508 mpe->mpe_function;
509 break;
510 case MAC_CREATE_MOUNT:
511 mpc->mpc_ops->mpo_create_mount =
512 mpe->mpe_function;
513 break;
514 case MAC_CREATE_ROOT_MOUNT:
515 mpc->mpc_ops->mpo_create_root_mount =
516 mpe->mpe_function;
517 break;
518 case MAC_RELABEL_VNODE:
519 mpc->mpc_ops->mpo_relabel_vnode =
520 mpe->mpe_function;
521 break;
522 case MAC_UPDATE_DEVFSDIRENT:
523 mpc->mpc_ops->mpo_update_devfsdirent =
524 mpe->mpe_function;
525 break;
526 case MAC_UPDATE_PROCFSVNODE:
527 mpc->mpc_ops->mpo_update_procfsvnode =
528 mpe->mpe_function;
529 break;
530 case MAC_UPDATE_VNODE_FROM_EXTATTR:
531 mpc->mpc_ops->mpo_update_vnode_from_extattr =
532 mpe->mpe_function;
533 break;
534 case MAC_UPDATE_VNODE_FROM_EXTERNALIZED:
535 mpc->mpc_ops->mpo_update_vnode_from_externalized =
536 mpe->mpe_function;
537 break;
538 case MAC_UPDATE_VNODE_FROM_MOUNT:
539 mpc->mpc_ops->mpo_update_vnode_from_mount =
540 mpe->mpe_function;
541 break;
542 case MAC_CREATE_MBUF_FROM_SOCKET:
543 mpc->mpc_ops->mpo_create_mbuf_from_socket =
544 mpe->mpe_function;
545 break;
546 case MAC_CREATE_PIPE:
547 mpc->mpc_ops->mpo_create_pipe =
548 mpe->mpe_function;
549 break;
550 case MAC_CREATE_SOCKET:
551 mpc->mpc_ops->mpo_create_socket =
552 mpe->mpe_function;
553 break;
554 case MAC_CREATE_SOCKET_FROM_SOCKET:
555 mpc->mpc_ops->mpo_create_socket_from_socket =
556 mpe->mpe_function;
557 break;
558 case MAC_RELABEL_PIPE:
559 mpc->mpc_ops->mpo_relabel_pipe =
560 mpe->mpe_function;
561 break;
562 case MAC_RELABEL_SOCKET:
563 mpc->mpc_ops->mpo_relabel_socket =
564 mpe->mpe_function;
565 break;
566 case MAC_SET_SOCKET_PEER_FROM_MBUF:
567 mpc->mpc_ops->mpo_set_socket_peer_from_mbuf =
568 mpe->mpe_function;
569 break;
570 case MAC_SET_SOCKET_PEER_FROM_SOCKET:
571 mpc->mpc_ops->mpo_set_socket_peer_from_socket =
572 mpe->mpe_function;
573 break;
574 case MAC_CREATE_BPFDESC:
575 mpc->mpc_ops->mpo_create_bpfdesc =
576 mpe->mpe_function;
577 break;
578 case MAC_CREATE_DATAGRAM_FROM_IPQ:
579 mpc->mpc_ops->mpo_create_datagram_from_ipq =
580 mpe->mpe_function;
581 break;
582 case MAC_CREATE_FRAGMENT:
583 mpc->mpc_ops->mpo_create_fragment =
584 mpe->mpe_function;
585 break;
586 case MAC_CREATE_IFNET:
587 mpc->mpc_ops->mpo_create_ifnet =
588 mpe->mpe_function;
589 break;
590 case MAC_CREATE_IPQ:
591 mpc->mpc_ops->mpo_create_ipq =
592 mpe->mpe_function;
593 break;
594 case MAC_CREATE_MBUF_FROM_MBUF:
595 mpc->mpc_ops->mpo_create_mbuf_from_mbuf =
596 mpe->mpe_function;
597 break;
598 case MAC_CREATE_MBUF_LINKLAYER:
599 mpc->mpc_ops->mpo_create_mbuf_linklayer =
600 mpe->mpe_function;
601 break;
602 case MAC_CREATE_MBUF_FROM_BPFDESC:
603 mpc->mpc_ops->mpo_create_mbuf_from_bpfdesc =
604 mpe->mpe_function;
605 break;
606 case MAC_CREATE_MBUF_FROM_IFNET:
607 mpc->mpc_ops->mpo_create_mbuf_from_ifnet =
608 mpe->mpe_function;
609 break;
610 case MAC_CREATE_MBUF_MULTICAST_ENCAP:
611 mpc->mpc_ops->mpo_create_mbuf_multicast_encap =
612 mpe->mpe_function;
613 break;
614 case MAC_CREATE_MBUF_NETLAYER:
615 mpc->mpc_ops->mpo_create_mbuf_netlayer =
616 mpe->mpe_function;
617 break;
618 case MAC_FRAGMENT_MATCH:
619 mpc->mpc_ops->mpo_fragment_match =
620 mpe->mpe_function;
621 break;
622 case MAC_RELABEL_IFNET:
623 mpc->mpc_ops->mpo_relabel_ifnet =
624 mpe->mpe_function;
625 break;
626 case MAC_UPDATE_IPQ:
627 mpc->mpc_ops->mpo_update_ipq =
628 mpe->mpe_function;
629 break;
630 case MAC_CREATE_CRED:
631 mpc->mpc_ops->mpo_create_cred =
632 mpe->mpe_function;
633 break;
634 case MAC_EXECVE_TRANSITION:
635 mpc->mpc_ops->mpo_execve_transition =
636 mpe->mpe_function;
637 break;
638 case MAC_EXECVE_WILL_TRANSITION:
639 mpc->mpc_ops->mpo_execve_will_transition =
640 mpe->mpe_function;
641 break;
642 case MAC_CREATE_PROC0:
643 mpc->mpc_ops->mpo_create_proc0 = mpe->mpe_function;
644 break;
645 case MAC_CREATE_PROC1:
646 mpc->mpc_ops->mpo_create_proc1 = mpe->mpe_function;
647 break;
648 case MAC_RELABEL_CRED:
649 mpc->mpc_ops->mpo_relabel_cred =
650 mpe->mpe_function;
651 break;
652 case MAC_CHECK_BPFDESC_RECEIVE:
653 mpc->mpc_ops->mpo_check_bpfdesc_receive =
654 mpe->mpe_function;
655 break;
656 case MAC_CHECK_CRED_RELABEL:
657 mpc->mpc_ops->mpo_check_cred_relabel =
658 mpe->mpe_function;
659 break;
660 case MAC_CHECK_CRED_VISIBLE:
661 mpc->mpc_ops->mpo_check_cred_visible =
662 mpe->mpe_function;
663 break;
664 case MAC_CHECK_IFNET_RELABEL:
665 mpc->mpc_ops->mpo_check_ifnet_relabel =
666 mpe->mpe_function;
667 break;
668 case MAC_CHECK_IFNET_TRANSMIT:
669 mpc->mpc_ops->mpo_check_ifnet_transmit =
670 mpe->mpe_function;
671 break;
672 case MAC_CHECK_MOUNT_STAT:
673 mpc->mpc_ops->mpo_check_mount_stat =
674 mpe->mpe_function;
675 break;
676 case MAC_CHECK_PIPE_IOCTL:
677 mpc->mpc_ops->mpo_check_pipe_ioctl =
678 mpe->mpe_function;
679 break;
680 case MAC_CHECK_PIPE_POLL:
681 mpc->mpc_ops->mpo_check_pipe_poll =
682 mpe->mpe_function;
683 break;
684 case MAC_CHECK_PIPE_READ:
685 mpc->mpc_ops->mpo_check_pipe_read =
686 mpe->mpe_function;
687 break;
688 case MAC_CHECK_PIPE_RELABEL:
689 mpc->mpc_ops->mpo_check_pipe_relabel =
690 mpe->mpe_function;
691 break;
692 case MAC_CHECK_PIPE_STAT:
693 mpc->mpc_ops->mpo_check_pipe_stat =
694 mpe->mpe_function;
695 break;
696 case MAC_CHECK_PIPE_WRITE:
697 mpc->mpc_ops->mpo_check_pipe_write =
698 mpe->mpe_function;
699 break;
700 case MAC_CHECK_PROC_DEBUG:
701 mpc->mpc_ops->mpo_check_proc_debug =
702 mpe->mpe_function;
703 break;
704 case MAC_CHECK_PROC_SCHED:
705 mpc->mpc_ops->mpo_check_proc_sched =
706 mpe->mpe_function;
707 break;
708 case MAC_CHECK_PROC_SIGNAL:
709 mpc->mpc_ops->mpo_check_proc_signal =
710 mpe->mpe_function;
711 break;
712 case MAC_CHECK_SOCKET_BIND:
713 mpc->mpc_ops->mpo_check_socket_bind =
714 mpe->mpe_function;
715 break;
716 case MAC_CHECK_SOCKET_CONNECT:
717 mpc->mpc_ops->mpo_check_socket_connect =
718 mpe->mpe_function;
719 break;
720 case MAC_CHECK_SOCKET_DELIVER:
721 mpc->mpc_ops->mpo_check_socket_deliver =
722 mpe->mpe_function;
723 break;
724 case MAC_CHECK_SOCKET_LISTEN:
725 mpc->mpc_ops->mpo_check_socket_listen =
726 mpe->mpe_function;
727 break;
728 case MAC_CHECK_SOCKET_RELABEL:
729 mpc->mpc_ops->mpo_check_socket_relabel =
730 mpe->mpe_function;
731 break;
732 case MAC_CHECK_SOCKET_VISIBLE:
733 mpc->mpc_ops->mpo_check_socket_visible =
734 mpe->mpe_function;
735 break;
736 case MAC_CHECK_VNODE_ACCESS:
737 mpc->mpc_ops->mpo_check_vnode_access =
738 mpe->mpe_function;
739 break;
740 case MAC_CHECK_VNODE_CHDIR:
741 mpc->mpc_ops->mpo_check_vnode_chdir =
742 mpe->mpe_function;
743 break;
744 case MAC_CHECK_VNODE_CHROOT:
745 mpc->mpc_ops->mpo_check_vnode_chroot =
746 mpe->mpe_function;
747 break;
748 case MAC_CHECK_VNODE_CREATE:
749 mpc->mpc_ops->mpo_check_vnode_create =
750 mpe->mpe_function;
751 break;
752 case MAC_CHECK_VNODE_DELETE:
753 mpc->mpc_ops->mpo_check_vnode_delete =
754 mpe->mpe_function;
755 break;
756 case MAC_CHECK_VNODE_DELETEACL:
757 mpc->mpc_ops->mpo_check_vnode_deleteacl =
758 mpe->mpe_function;
759 break;
760 case MAC_CHECK_VNODE_EXEC:
761 mpc->mpc_ops->mpo_check_vnode_exec =
762 mpe->mpe_function;
763 break;
764 case MAC_CHECK_VNODE_GETACL:
765 mpc->mpc_ops->mpo_check_vnode_getacl =
766 mpe->mpe_function;
767 break;
768 case MAC_CHECK_VNODE_GETEXTATTR:
769 mpc->mpc_ops->mpo_check_vnode_getextattr =
770 mpe->mpe_function;
771 break;
772 case MAC_CHECK_VNODE_LOOKUP:
773 mpc->mpc_ops->mpo_check_vnode_lookup =
774 mpe->mpe_function;
775 break;
776 case MAC_CHECK_VNODE_MMAP_PERMS:
777 mpc->mpc_ops->mpo_check_vnode_mmap_perms =
778 mpe->mpe_function;
779 break;
780 case MAC_CHECK_VNODE_OPEN:
781 mpc->mpc_ops->mpo_check_vnode_open =
782 mpe->mpe_function;
783 break;
784 case MAC_CHECK_VNODE_POLL:
785 mpc->mpc_ops->mpo_check_vnode_poll =
786 mpe->mpe_function;
787 break;
788 case MAC_CHECK_VNODE_READ:
789 mpc->mpc_ops->mpo_check_vnode_read =
790 mpe->mpe_function;
791 break;
792 case MAC_CHECK_VNODE_READDIR:
793 mpc->mpc_ops->mpo_check_vnode_readdir =
794 mpe->mpe_function;
795 break;
796 case MAC_CHECK_VNODE_READLINK:
797 mpc->mpc_ops->mpo_check_vnode_readlink =
798 mpe->mpe_function;
799 break;
800 case MAC_CHECK_VNODE_RELABEL:
801 mpc->mpc_ops->mpo_check_vnode_relabel =
802 mpe->mpe_function;
803 break;
804 case MAC_CHECK_VNODE_RENAME_FROM:
805 mpc->mpc_ops->mpo_check_vnode_rename_from =
806 mpe->mpe_function;
807 break;
808 case MAC_CHECK_VNODE_RENAME_TO:
809 mpc->mpc_ops->mpo_check_vnode_rename_to =
810 mpe->mpe_function;
811 break;
812 case MAC_CHECK_VNODE_REVOKE:
813 mpc->mpc_ops->mpo_check_vnode_revoke =
814 mpe->mpe_function;
815 break;
816 case MAC_CHECK_VNODE_SETACL:
817 mpc->mpc_ops->mpo_check_vnode_setacl =
818 mpe->mpe_function;
819 break;
820 case MAC_CHECK_VNODE_SETEXTATTR:
821 mpc->mpc_ops->mpo_check_vnode_setextattr =
822 mpe->mpe_function;
823 break;
824 case MAC_CHECK_VNODE_SETFLAGS:
825 mpc->mpc_ops->mpo_check_vnode_setflags =
826 mpe->mpe_function;
827 break;
828 case MAC_CHECK_VNODE_SETMODE:
829 mpc->mpc_ops->mpo_check_vnode_setmode =
830 mpe->mpe_function;
831 break;
832 case MAC_CHECK_VNODE_SETOWNER:
833 mpc->mpc_ops->mpo_check_vnode_setowner =
834 mpe->mpe_function;
835 break;
836 case MAC_CHECK_VNODE_SETUTIMES:
837 mpc->mpc_ops->mpo_check_vnode_setutimes =
838 mpe->mpe_function;
839 break;
840 case MAC_CHECK_VNODE_STAT:
841 mpc->mpc_ops->mpo_check_vnode_stat =
842 mpe->mpe_function;
843 break;
844 case MAC_CHECK_VNODE_WRITE:
845 mpc->mpc_ops->mpo_check_vnode_write =
846 mpe->mpe_function;
847 break;
848/*
849 default:
850 printf("MAC policy `%s': unknown operation %d\n",
851 mpc->mpc_name, mpe->mpe_constant);
852 return (EINVAL);
853*/
854 }
855 }
856 MAC_POLICY_LIST_LOCK();
857 if (mac_policy_list_busy > 0) {
858 MAC_POLICY_LIST_UNLOCK();
859 FREE(mpc->mpc_ops, M_MACOPVEC);
860 mpc->mpc_ops = NULL;
861 return (EBUSY);
862 }
863 LIST_FOREACH(tmpc, &mac_policy_list, mpc_list) {
864 if (strcmp(tmpc->mpc_name, mpc->mpc_name) == 0) {
865 MAC_POLICY_LIST_UNLOCK();
866 FREE(mpc->mpc_ops, M_MACOPVEC);
867 mpc->mpc_ops = NULL;
868 return (EEXIST);
869 }
870 }
871 if (mpc->mpc_field_off != NULL) {
872 slot = ffs(mac_policy_offsets_free);
873 if (slot == 0) {
874 MAC_POLICY_LIST_UNLOCK();
875 FREE(mpc->mpc_ops, M_MACOPVEC);
876 mpc->mpc_ops = NULL;
877 return (ENOMEM);
878 }
879 slot--;
880 mac_policy_offsets_free &= ~(1 << slot);
881 *mpc->mpc_field_off = slot;
882 }
883 mpc->mpc_runtime_flags |= MPC_RUNTIME_FLAG_REGISTERED;
884 LIST_INSERT_HEAD(&mac_policy_list, mpc, mpc_list);
885
886 /* Per-policy initialization. */
887 if (mpc->mpc_ops->mpo_init != NULL)
888 (*(mpc->mpc_ops->mpo_init))(mpc);
889 MAC_POLICY_LIST_UNLOCK();
890
891 printf("Security policy loaded: %s (%s)\n", mpc->mpc_fullname,
892 mpc->mpc_name);
893
894 return (0);
895}
896
897static int
898mac_policy_unregister(struct mac_policy_conf *mpc)
899{
900
901#if 0
902 /*
903 * Don't allow unloading modules with private data.
904 */
905 if (mpc->mpc_field_off != NULL)
906 return (EBUSY);
907#endif
908 if ((mpc->mpc_loadtime_flags & MPC_LOADTIME_FLAG_UNLOADOK) == 0)
909 return (EBUSY);
910 MAC_POLICY_LIST_LOCK();
911 if (mac_policy_list_busy > 0) {
912 MAC_POLICY_LIST_UNLOCK();
913 return (EBUSY);
914 }
915 if (mpc->mpc_ops->mpo_destroy != NULL)
916 (*(mpc->mpc_ops->mpo_destroy))(mpc);
917
918 LIST_REMOVE(mpc, mpc_list);
919 MAC_POLICY_LIST_UNLOCK();
920
921 FREE(mpc->mpc_ops, M_MACOPVEC);
922 mpc->mpc_ops = NULL;
923
924 printf("Security policy unload: %s (%s)\n", mpc->mpc_fullname,
925 mpc->mpc_name);
926
927 return (0);
928}
929
930/*
931 * Define an error value precedence, and given two arguments, selects the
932 * value with the higher precedence.
933 */
934static int
935error_select(int error1, int error2)
936{
937
938 /* Certain decision-making errors take top priority. */
939 if (error1 == EDEADLK || error2 == EDEADLK)
940 return (EDEADLK);
941
942 /* Invalid arguments should be reported where possible. */
943 if (error1 == EINVAL || error2 == EINVAL)
944 return (EINVAL);
945
946 /* Precedence goes to "visibility", with both process and file. */
947 if (error1 == ESRCH || error2 == ESRCH)
948 return (ESRCH);
949
950 if (error1 == ENOENT || error2 == ENOENT)
951 return (ENOENT);
952
953 /* Precedence goes to DAC/MAC protections. */
954 if (error1 == EACCES || error2 == EACCES)
955 return (EACCES);
956
957 /* Precedence goes to privilege. */
958 if (error1 == EPERM || error2 == EPERM)
959 return (EPERM);
960
961 /* Precedence goes to error over success; otherwise, arbitrary. */
962 if (error1 != 0)
963 return (error1);
964 return (error2);
965}
966
967void
968mac_update_devfsdirent(struct devfs_dirent *de, struct vnode *vp)
969{
970
971 MAC_PERFORM(update_devfsdirent, de, &de->de_label, vp, &vp->v_label);
972}
973
974void
975mac_update_procfsvnode(struct vnode *vp, struct ucred *cred)
976{
977
978 MAC_PERFORM(update_procfsvnode, vp, &vp->v_label, cred);
979}
980
981/*
982 * Support callout for policies that manage their own externalization
983 * using extended attributes.
984 */
985static int
986mac_update_vnode_from_extattr(struct vnode *vp, struct mount *mp)
987{
988 int error;
989
990 MAC_CHECK(update_vnode_from_extattr, vp, &vp->v_label, mp,
991 &mp->mnt_fslabel);
992
993 return (error);
994}
995
996/*
997 * Given an externalized mac label, internalize it and stamp it on a
998 * vnode.
999 */
1000static int
1001mac_update_vnode_from_externalized(struct vnode *vp, struct mac *extmac)
1002{
1003 int error;
1004
1005 MAC_CHECK(update_vnode_from_externalized, vp, &vp->v_label, extmac);
1006
1007 return (error);
1008}
1009
1010/*
1011 * Call out to individual policies to update the label in a vnode from
1012 * the mountpoint.
1013 */
1014void
1015mac_update_vnode_from_mount(struct vnode *vp, struct mount *mp)
1016{
1017
1018 MAC_PERFORM(update_vnode_from_mount, vp, &vp->v_label, mp,
1019 &mp->mnt_fslabel);
1020
1021 ASSERT_VOP_LOCKED(vp, "mac_update_vnode_from_mount");
1022 if (mac_cache_fslabel_in_vnode)
1023 vp->v_vflag |= VV_CACHEDLABEL;
1024}
1025
1026/*
1027 * Implementation of VOP_REFRESHLABEL() that relies on extended attributes
1028 * to store label data. Can be referenced by filesystems supporting
1029 * extended attributes.
1030 */
1031int
1032vop_stdrefreshlabel_ea(struct vop_refreshlabel_args *ap)
1033{
1034 struct vnode *vp = ap->a_vp;
1035 struct mac extmac;
1036 int buflen, error;
1037
1038 ASSERT_VOP_LOCKED(vp, "vop_stdrefreshlabel_ea");
1039
1040 /*
1041 * Call out to external policies first. Order doesn't really
1042 * matter, as long as failure of one assures failure of all.
1043 */
1044 error = mac_update_vnode_from_extattr(vp, vp->v_mount);
1045 if (error)
1046 return (error);
1047
1048 buflen = sizeof(extmac);
1049 error = vn_extattr_get(vp, IO_NODELOCKED,
1050 FREEBSD_MAC_EXTATTR_NAMESPACE, FREEBSD_MAC_EXTATTR_NAME, &buflen,
1051 (char *)&extmac, curthread);
1052 switch (error) {
1053 case 0:
1054 /* Got it */
1055 break;
1056
1057 case ENOATTR:
1058 /*
1059 * Use the label from the mount point.
1060 */
1061 mac_update_vnode_from_mount(vp, vp->v_mount);
1062 return (0);
1063
1064 case EOPNOTSUPP:
1065 default:
1066 /* Fail horribly. */
1067 return (error);
1068 }
1069
1070 if (buflen != sizeof(extmac))
1071 error = EPERM; /* Fail very closed. */
1072 if (error == 0)
1073 error = mac_update_vnode_from_externalized(vp, &extmac);
1074 if (error == 0)
1075 vp->v_vflag |= VV_CACHEDLABEL;
1076 else {
1077 struct vattr va;
1078
1079 printf("Corrupted label on %s",
1080 vp->v_mount->mnt_stat.f_mntonname);
1081 if (VOP_GETATTR(vp, &va, curthread->td_ucred, curthread) == 0)
1082 printf(" inum %ld", va.va_fileid);
1083 if (mac_debug_label_fallback) {
1084 printf(", falling back.\n");
1085 mac_update_vnode_from_mount(vp, vp->v_mount);
1086 error = 0;
1087 } else {
1088 printf(".\n");
1089 error = EPERM;
1090 }
1091 }
1092
1093 return (error);
1094}
1095
1096/*
1097 * Make sure the vnode label is up-to-date. If EOPNOTSUPP, then we handle
1098 * the labeling activity outselves. Filesystems should be careful not
1099 * to change their minds regarding whether they support vop_refreshlabel()
1100 * for a vnode or not. Don't cache the vnode here, allow the file
1101 * system code to determine if it's safe to cache. If we update from
1102 * the mount, don't cache since a change to the mount label should affect
1103 * all vnodes.
1104 */
1105static int
1106vn_refreshlabel(struct vnode *vp, struct ucred *cred)
1107{
1108 int error;
1109
1110 ASSERT_VOP_LOCKED(vp, "vn_refreshlabel");
1111
1112 if (vp->v_mount == NULL) {
1113/*
1114 Eventually, we probably want to special-case refreshing
1115 of deadfs vnodes, and if there's a lock-free race somewhere,
1116 that case might be handled here.
1117
1118 mac_update_vnode_deadfs(vp);
1119 return (0);
1120 */
1121 /* printf("vn_refreshlabel: null v_mount\n"); */
1122 if (vp->v_type != VNON)
1123 printf(
1124 "vn_refreshlabel: null v_mount with non-VNON\n");
1125 return (EBADF);
1126 }
1127
1128 if (vp->v_vflag & VV_CACHEDLABEL) {
1129 mac_vnode_label_cache_hits++;
1130 return (0);
1131 } else
1132 mac_vnode_label_cache_misses++;
1133
1134 if ((vp->v_mount->mnt_flag & MNT_MULTILABEL) == 0) {
1135 mac_update_vnode_from_mount(vp, vp->v_mount);
1136 return (0);
1137 }
1138
1139 error = VOP_REFRESHLABEL(vp, cred, curthread);
1140 switch (error) {
1141 case EOPNOTSUPP:
1142 /*
1143 * If labels are not supported on this vnode, fall back to
1144 * the label in the mount and propagate it to the vnode.
1145 * There should probably be some sort of policy/flag/decision
1146 * about doing this.
1147 */
1148 mac_update_vnode_from_mount(vp, vp->v_mount);
1149 error = 0;
1150 default:
1151 return (error);
1152 }
1153}
1154
1155/*
1156 * Helper function for file systems using the vop_std*_ea() calls. This
1157 * function must be called after EA service is available for the vnode,
1158 * but before it's hooked up to the namespace so that the node persists
1159 * if there's a crash, or before it can be accessed. On successful
1160 * commit of the label to disk (etc), do cache the label.
1161 */
1162int
1163vop_stdcreatevnode_ea(struct vnode *dvp, struct vnode *tvp, struct ucred *cred)
1164{
1165 struct mac extmac;
1166 int error;
1167
1168 ASSERT_VOP_LOCKED(tvp, "vop_stdcreatevnode_ea");
1169 if ((dvp->v_mount->mnt_flag & MNT_MULTILABEL) == 0) {
1170 mac_update_vnode_from_mount(tvp, tvp->v_mount);
1171 } else {
1172 error = vn_refreshlabel(dvp, cred);
1173 if (error)
1174 return (error);
1175
1176 /*
1177 * Stick the label in the vnode. Then try to write to
1178 * disk. If we fail, return a failure to abort the
1179 * create operation. Really, this failure shouldn't
1180 * happen except in fairly unusual circumstances (out
1181 * of disk, etc).
1182 */
1183 mac_create_vnode(cred, dvp, tvp);
1184
1185 error = mac_stdcreatevnode_ea(tvp);
1186 if (error)
1187 return (error);
1188
1189 /*
1190 * XXX: Eventually this will go away and all policies will
1191 * directly manage their extended attributes.
1192 */
1193 error = mac_externalize(&tvp->v_label, &extmac);
1194 if (error)
1195 return (error);
1196
1197 error = vn_extattr_set(tvp, IO_NODELOCKED,
1198 FREEBSD_MAC_EXTATTR_NAMESPACE, FREEBSD_MAC_EXTATTR_NAME,
1199 sizeof(extmac), (char *)&extmac, curthread);
1200 if (error == 0)
1201 tvp->v_vflag |= VV_CACHEDLABEL;
1202 else {
1203#if 0
1204 /*
1205 * In theory, we could have fall-back behavior here.
1206 * It would probably be incorrect.
1207 */
1208#endif
1209 return (error);
1210 }
1211 }
1212
1213 return (0);
1214}
1215
1216void
1217mac_execve_transition(struct ucred *old, struct ucred *new, struct vnode *vp)
1218{
1219 int error;
1220
1221 ASSERT_VOP_LOCKED(vp, "mac_execve_transition");
1222
1223 error = vn_refreshlabel(vp, old);
1224 if (error) {
1225 printf("mac_execve_transition: vn_refreshlabel returned %d\n",
1226 error);
1227 printf("mac_execve_transition: using old vnode label\n");
1228 }
1229
1230 MAC_PERFORM(execve_transition, old, new, vp, &vp->v_label);
1231}
1232
1233int
1234mac_execve_will_transition(struct ucred *old, struct vnode *vp)
1235{
1236 int error, result;
1237
1238 error = vn_refreshlabel(vp, old);
1239 if (error)
1240 return (error);
1241
1242 result = 0;
1243 MAC_BOOLEAN(execve_will_transition, ||, old, vp, &vp->v_label);
1244
1245 return (result);
1246}
1247
1248static void
1249mac_init_label(struct label *label)
1250{
1251
1252 bzero(label, sizeof(*label));
1253 label->l_flags = MAC_FLAG_INITIALIZED;
1254}
1255
1256static void
1257mac_init_structmac(struct mac *mac)
1258{
1259
1260 bzero(mac, sizeof(*mac));
1261 mac->m_macflags = MAC_FLAG_INITIALIZED;
1262}
1263
1264static void
1265mac_destroy_label(struct label *label)
1266{
1267
1268 KASSERT(label->l_flags & MAC_FLAG_INITIALIZED,
1269 ("destroying uninitialized label"));
1270
1271 bzero(label, sizeof(*label));
1272 /* implicit: label->l_flags &= ~MAC_FLAG_INITIALIZED; */
1273}
1274
1275int
1276mac_init_mbuf(struct mbuf *m, int how)
1277{
1278 KASSERT(m->m_flags & M_PKTHDR, ("mac_init_mbuf on non-header mbuf"));
1279
1280 /* "how" is one of M_(TRY|DONT)WAIT */
1281 mac_init_label(&m->m_pkthdr.label);
1282 MAC_PERFORM(init_mbuf, m, how, &m->m_pkthdr.label);
1283#ifdef MAC_DEBUG
1284 atomic_add_int(&nmacmbufs, 1);
1285#endif
1286 return (0);
1287}
1288
1289void
1290mac_destroy_mbuf(struct mbuf *m)
1291{
1292
1293 MAC_PERFORM(destroy_mbuf, m, &m->m_pkthdr.label);
1294 mac_destroy_label(&m->m_pkthdr.label);
1295#ifdef MAC_DEBUG
1296 atomic_subtract_int(&nmacmbufs, 1);
1297#endif
1298}
1299
1300void
1301mac_init_cred(struct ucred *cr)
1302{
1303
1304 mac_init_label(&cr->cr_label);
1305 MAC_PERFORM(init_cred, cr, &cr->cr_label);
1306#ifdef MAC_DEBUG
1307 atomic_add_int(&nmaccreds, 1);
1308#endif
1309}
1310
1311void
1312mac_destroy_cred(struct ucred *cr)
1313{
1314
1315 MAC_PERFORM(destroy_cred, cr, &cr->cr_label);
1316 mac_destroy_label(&cr->cr_label);
1317#ifdef MAC_DEBUG
1318 atomic_subtract_int(&nmaccreds, 1);
1319#endif
1320}
1321
1322void
1323mac_init_ifnet(struct ifnet *ifp)
1324{
1325
1326 mac_init_label(&ifp->if_label);
1327 MAC_PERFORM(init_ifnet, ifp, &ifp->if_label);
1328#ifdef MAC_DEBUG
1329 atomic_add_int(&nmacifnets, 1);
1330#endif
1331}
1332
1333void
1334mac_destroy_ifnet(struct ifnet *ifp)
1335{
1336
1337 MAC_PERFORM(destroy_ifnet, ifp, &ifp->if_label);
1338 mac_destroy_label(&ifp->if_label);
1339#ifdef MAC_DEBUG
1340 atomic_subtract_int(&nmacifnets, 1);
1341#endif
1342}
1343
1344void
1345mac_init_ipq(struct ipq *ipq)
1346{
1347
1348 mac_init_label(&ipq->ipq_label);
1349 MAC_PERFORM(init_ipq, ipq, &ipq->ipq_label);
1350#ifdef MAC_DEBUG
1351 atomic_add_int(&nmacipqs, 1);
1352#endif
1353}
1354
1355void
1356mac_destroy_ipq(struct ipq *ipq)
1357{
1358
1359 MAC_PERFORM(destroy_ipq, ipq, &ipq->ipq_label);
1360 mac_destroy_label(&ipq->ipq_label);
1361#ifdef MAC_DEBUG
1362 atomic_subtract_int(&nmacipqs, 1);
1363#endif
1364}
1365
1366void
1367mac_init_socket(struct socket *socket)
1368{
1369
1370 mac_init_label(&socket->so_label);
1371 mac_init_label(&socket->so_peerlabel);
1372 MAC_PERFORM(init_socket, socket, &socket->so_label,
1373 &socket->so_peerlabel);
1374#ifdef MAC_DEBUG
1375 atomic_add_int(&nmacsockets, 1);
1376#endif
1377}
1378
1379void
1380mac_destroy_socket(struct socket *socket)
1381{
1382
1383 MAC_PERFORM(destroy_socket, socket, &socket->so_label,
1384 &socket->so_peerlabel);
1385 mac_destroy_label(&socket->so_label);
1386 mac_destroy_label(&socket->so_peerlabel);
1387#ifdef MAC_DEBUG
1388 atomic_subtract_int(&nmacsockets, 1);
1389#endif
1390}
1391
1392void
1393mac_init_pipe(struct pipe *pipe)
1394{
1395 struct label *label;
1396
1397 label = malloc(sizeof(struct label), M_MACPIPELABEL, M_ZERO|M_WAITOK);
1398 mac_init_label(label);
1399 pipe->pipe_label = label;
1400 pipe->pipe_peer->pipe_label = label;
1401 MAC_PERFORM(init_pipe, pipe, pipe->pipe_label);
1402#ifdef MAC_DEBUG
1403 atomic_add_int(&nmacpipes, 1);
1404#endif
1405}
1406
1407void
1408mac_destroy_pipe(struct pipe *pipe)
1409{
1410
1411 MAC_PERFORM(destroy_pipe, pipe, pipe->pipe_label);
1412 mac_destroy_label(pipe->pipe_label);
1413 free(pipe->pipe_label, M_MACPIPELABEL);
1414#ifdef MAC_DEBUG
1415 atomic_subtract_int(&nmacpipes, 1);
1416#endif
1417}
1418
1419void
1420mac_init_bpfdesc(struct bpf_d *bpf_d)
1421{
1422
1423 mac_init_label(&bpf_d->bd_label);
1424 MAC_PERFORM(init_bpfdesc, bpf_d, &bpf_d->bd_label);
1425#ifdef MAC_DEBUG
1426 atomic_add_int(&nmacbpfdescs, 1);
1427#endif
1428}
1429
1430void
1431mac_destroy_bpfdesc(struct bpf_d *bpf_d)
1432{
1433
1434 MAC_PERFORM(destroy_bpfdesc, bpf_d, &bpf_d->bd_label);
1435 mac_destroy_label(&bpf_d->bd_label);
1436#ifdef MAC_DEBUG
1437 atomic_subtract_int(&nmacbpfdescs, 1);
1438#endif
1439}
1440
1441void
1442mac_init_mount(struct mount *mp)
1443{
1444
1445 mac_init_label(&mp->mnt_mntlabel);
1446 mac_init_label(&mp->mnt_fslabel);
1447 MAC_PERFORM(init_mount, mp, &mp->mnt_mntlabel, &mp->mnt_fslabel);
1448#ifdef MAC_DEBUG
1449 atomic_add_int(&nmacmounts, 1);
1450#endif
1451}
1452
1453void
1454mac_destroy_mount(struct mount *mp)
1455{
1456
1457 MAC_PERFORM(destroy_mount, mp, &mp->mnt_mntlabel, &mp->mnt_fslabel);
1458 mac_destroy_label(&mp->mnt_fslabel);
1459 mac_destroy_label(&mp->mnt_mntlabel);
1460#ifdef MAC_DEBUG
1461 atomic_subtract_int(&nmacmounts, 1);
1462#endif
1463}
1464
1465static void
1466mac_init_temp(struct label *label)
1467{
1468
1469 mac_init_label(label);
1470 MAC_PERFORM(init_temp, label);
1471#ifdef MAC_DEBUG
1472 atomic_add_int(&nmactemp, 1);
1473#endif
1474}
1475
1476static void
1477mac_destroy_temp(struct label *label)
1478{
1479
1480 MAC_PERFORM(destroy_temp, label);
1481 mac_destroy_label(label);
1482#ifdef MAC_DEBUG
1483 atomic_subtract_int(&nmactemp, 1);
1484#endif
1485}
1486
1487void
1488mac_init_vnode(struct vnode *vp)
1489{
1490
1491 mac_init_label(&vp->v_label);
1492 MAC_PERFORM(init_vnode, vp, &vp->v_label);
1493#ifdef MAC_DEBUG
1494 atomic_add_int(&nmacvnodes, 1);
1495#endif
1496}
1497
1498void
1499mac_destroy_vnode(struct vnode *vp)
1500{
1501
1502 MAC_PERFORM(destroy_vnode, vp, &vp->v_label);
1503 mac_destroy_label(&vp->v_label);
1504#ifdef MAC_DEBUG
1505 atomic_subtract_int(&nmacvnodes, 1);
1506#endif
1507}
1508
1509void
1510mac_init_devfsdirent(struct devfs_dirent *de)
1511{
1512
1513 mac_init_label(&de->de_label);
1514 MAC_PERFORM(init_devfsdirent, de, &de->de_label);
1515#ifdef MAC_DEBUG
1516 atomic_add_int(&nmacdevfsdirents, 1);
1517#endif
1518}
1519
1520void
1521mac_destroy_devfsdirent(struct devfs_dirent *de)
1522{
1523
1524 MAC_PERFORM(destroy_devfsdirent, de, &de->de_label);
1525 mac_destroy_label(&de->de_label);
1526#ifdef MAC_DEBUG
1527 atomic_subtract_int(&nmacdevfsdirents, 1);
1528#endif
1529}
1530
1531static int
1532mac_externalize(struct label *label, struct mac *mac)
1533{
1534 int error;
1535
1536 mac_init_structmac(mac);
1537 MAC_CHECK(externalize, label, mac);
1538
1539 return (error);
1540}
1541
1542static int
1543mac_internalize(struct label *label, struct mac *mac)
1544{
1545 int error;
1546
1547 mac_init_temp(label);
1548 MAC_CHECK(internalize, label, mac);
1549 if (error)
1550 mac_destroy_temp(label);
1551
1552 return (error);
1553}
1554
1555/*
1556 * Initialize MAC label for the first kernel process, from which other
1557 * kernel processes and threads are spawned.
1558 */
1559void
1560mac_create_proc0(struct ucred *cred)
1561{
1562
1563 MAC_PERFORM(create_proc0, cred);
1564}
1565
1566/*
1567 * Initialize MAC label for the first userland process, from which other
1568 * userland processes and threads are spawned.
1569 */
1570void
1571mac_create_proc1(struct ucred *cred)
1572{
1573
1574 MAC_PERFORM(create_proc1, cred);
1575}
1576
1577/*
1578 * When a new process is created, its label must be initialized. Generally,
1579 * this involves inheritence from the parent process, modulo possible
1580 * deltas. This function allows that processing to take place.
1581 */
1582void
1583mac_create_cred(struct ucred *parent_cred, struct ucred *child_cred)
1584{
1585
1586 MAC_PERFORM(create_cred, parent_cred, child_cred);
1587}
1588
1589int
1590mac_check_vnode_access(struct ucred *cred, struct vnode *vp, int flags)
1591{
1592 int error;
1593
1594 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_access");
1595
1596 if (!mac_enforce_fs)
1597 return (0);
1598
1599 error = vn_refreshlabel(vp, cred);
1600 if (error)
1601 return (error);
1602
1603 MAC_CHECK(check_vnode_access, cred, vp, &vp->v_label, flags);
1604 return (error);
1605}
1606
1607int
1608mac_check_vnode_chdir(struct ucred *cred, struct vnode *dvp)
1609{
1610 int error;
1611
1612 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_chdir");
1613
1614 if (!mac_enforce_fs)
1615 return (0);
1616
1617 error = vn_refreshlabel(dvp, cred);
1618 if (error)
1619 return (error);
1620
1621 MAC_CHECK(check_vnode_chdir, cred, dvp, &dvp->v_label);
1622 return (error);
1623}
1624
1625int
1626mac_check_vnode_chroot(struct ucred *cred, struct vnode *dvp)
1627{
1628 int error;
1629
1630 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_chroot");
1631
1632 if (!mac_enforce_fs)
1633 return (0);
1634
1635 error = vn_refreshlabel(dvp, cred);
1636 if (error)
1637 return (error);
1638
1639 MAC_CHECK(check_vnode_chroot, cred, dvp, &dvp->v_label);
1640 return (error);
1641}
1642
1643int
1644mac_check_vnode_create(struct ucred *cred, struct vnode *dvp,
1645 struct componentname *cnp, struct vattr *vap)
1646{
1647 int error;
1648
1649 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_create");
1650
1651 if (!mac_enforce_fs)
1652 return (0);
1653
1654 error = vn_refreshlabel(dvp, cred);
1655 if (error)
1656 return (error);
1657
1658 MAC_CHECK(check_vnode_create, cred, dvp, &dvp->v_label, cnp, vap);
1659 return (error);
1660}
1661
1662int
1663mac_check_vnode_delete(struct ucred *cred, struct vnode *dvp, struct vnode *vp,
1664 struct componentname *cnp)
1665{
1666 int error;
1667
1668 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_delete");
1669 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_delete");
1670
1671 if (!mac_enforce_fs)
1672 return (0);
1673
1674 error = vn_refreshlabel(dvp, cred);
1675 if (error)
1676 return (error);
1677 error = vn_refreshlabel(vp, cred);
1678 if (error)
1679 return (error);
1680
1681 MAC_CHECK(check_vnode_delete, cred, dvp, &dvp->v_label, vp,
1682 &vp->v_label, cnp);
1683 return (error);
1684}
1685
1686int
1687mac_check_vnode_deleteacl(struct ucred *cred, struct vnode *vp,
1688 acl_type_t type)
1689{
1690 int error;
1691
1692 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_deleteacl");
1693
1694 if (!mac_enforce_fs)
1695 return (0);
1696
1697 error = vn_refreshlabel(vp, cred);
1698 if (error)
1699 return (error);
1700
1701 MAC_CHECK(check_vnode_deleteacl, cred, vp, &vp->v_label, type);
1702 return (error);
1703}
1704
1705int
1706mac_check_vnode_exec(struct ucred *cred, struct vnode *vp)
1707{
1708 int error;
1709
1710 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_exec");
1711
1712 if (!mac_enforce_process && !mac_enforce_fs)
1713 return (0);
1714
1715 error = vn_refreshlabel(vp, cred);
1716 if (error)
1717 return (error);
1718 MAC_CHECK(check_vnode_exec, cred, vp, &vp->v_label);
1719
1720 return (error);
1721}
1722
1723int
1724mac_check_vnode_getacl(struct ucred *cred, struct vnode *vp, acl_type_t type)
1725{
1726 int error;
1727
1728 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_getacl");
1729
1730 if (!mac_enforce_fs)
1731 return (0);
1732
1733 error = vn_refreshlabel(vp, cred);
1734 if (error)
1735 return (error);
1736
1737 MAC_CHECK(check_vnode_getacl, cred, vp, &vp->v_label, type);
1738 return (error);
1739}
1740
1741int
1742mac_check_vnode_getextattr(struct ucred *cred, struct vnode *vp,
1743 int attrnamespace, const char *name, struct uio *uio)
1744{
1745 int error;
1746
1747 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_getextattr");
1748
1749 if (!mac_enforce_fs)
1750 return (0);
1751
1752 error = vn_refreshlabel(vp, cred);
1753 if (error)
1754 return (error);
1755
1756 MAC_CHECK(check_vnode_getextattr, cred, vp, &vp->v_label,
1757 attrnamespace, name, uio);
1758 return (error);
1759}
1760
1761int
1762mac_check_vnode_lookup(struct ucred *cred, struct vnode *dvp,
1763 struct componentname *cnp)
1764{
1765 int error;
1766
1767 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_lookup");
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_lookup, cred, dvp, &dvp->v_label, cnp);
1777 return (error);
1778}
1779
1780vm_prot_t
1781mac_check_vnode_mmap_prot(struct ucred *cred, struct vnode *vp, int newmapping)
1782{
1783 vm_prot_t result = VM_PROT_ALL;
1784
1785 if (!mac_enforce_vm)
1786 return (result);
1787
1788 /*
1789 * This should be some sort of MAC_BITWISE, maybe :)
1790 */
1791 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mmap_perms");
1792 MAC_BOOLEAN(check_vnode_mmap_perms, &, cred, vp, &vp->v_label,
1793 newmapping);
1794 return (result);
1795}
1796
1797int
1798mac_check_vnode_open(struct ucred *cred, struct vnode *vp, mode_t acc_mode)
1799{
1800 int error;
1801
1802 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_open");
1803
1804 if (!mac_enforce_fs)
1805 return (0);
1806
1807 error = vn_refreshlabel(vp, cred);
1808 if (error)
1809 return (error);
1810
1811 MAC_CHECK(check_vnode_open, cred, vp, &vp->v_label, acc_mode);
1812 return (error);
1813}
1814
1815int
1816mac_check_vnode_poll(struct ucred *active_cred, struct ucred *file_cred,
1817 struct vnode *vp)
1818{
1819 int error;
1820
1821 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_poll");
1822
1823 if (!mac_enforce_fs)
1824 return (0);
1825
1826 error = vn_refreshlabel(vp, active_cred);
1827 if (error)
1828 return (error);
1829
1830 MAC_CHECK(check_vnode_poll, active_cred, file_cred, vp,
1831 &vp->v_label);
1832
1833 return (error);
1834}
1835
1836int
1837mac_check_vnode_read(struct ucred *active_cred, struct ucred *file_cred,
1838 struct vnode *vp)
1839{
1840 int error;
1841
1842 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_read");
1843
1844 if (!mac_enforce_fs)
1845 return (0);
1846
1847 error = vn_refreshlabel(vp, active_cred);
1848 if (error)
1849 return (error);
1850
1851 MAC_CHECK(check_vnode_read, active_cred, file_cred, vp,
1852 &vp->v_label);
1853
1854 return (error);
1855}
1856
1857int
1858mac_check_vnode_readdir(struct ucred *cred, struct vnode *dvp)
1859{
1860 int error;
1861
1862 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_readdir");
1863
1864 if (!mac_enforce_fs)
1865 return (0);
1866
1867 error = vn_refreshlabel(dvp, cred);
1868 if (error)
1869 return (error);
1870
1871 MAC_CHECK(check_vnode_readdir, cred, dvp, &dvp->v_label);
1872 return (error);
1873}
1874
1875int
1876mac_check_vnode_readlink(struct ucred *cred, struct vnode *vp)
1877{
1878 int error;
1879
1880 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_readlink");
1881
1882 if (!mac_enforce_fs)
1883 return (0);
1884
1885 error = vn_refreshlabel(vp, cred);
1886 if (error)
1887 return (error);
1888
1889 MAC_CHECK(check_vnode_readlink, cred, vp, &vp->v_label);
1890 return (error);
1891}
1892
1893static int
1894mac_check_vnode_relabel(struct ucred *cred, struct vnode *vp,
1895 struct label *newlabel)
1896{
1897 int error;
1898
1899 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_relabel");
1900
1901 error = vn_refreshlabel(vp, cred);
1902 if (error)
1903 return (error);
1904
1905 MAC_CHECK(check_vnode_relabel, cred, vp, &vp->v_label, newlabel);
1906
1907 return (error);
1908}
1909
1910int
1911mac_check_vnode_rename_from(struct ucred *cred, struct vnode *dvp,
1912 struct vnode *vp, struct componentname *cnp)
1913{
1914 int error;
1915
1916 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_rename_from");
1917 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_rename_from");
1918
1919 if (!mac_enforce_fs)
1920 return (0);
1921
1922 error = vn_refreshlabel(dvp, cred);
1923 if (error)
1924 return (error);
1925 error = vn_refreshlabel(vp, cred);
1926 if (error)
1927 return (error);
1928
1929 MAC_CHECK(check_vnode_rename_from, cred, dvp, &dvp->v_label, vp,
1930 &vp->v_label, cnp);
1931 return (error);
1932}
1933
1934int
1935mac_check_vnode_rename_to(struct ucred *cred, struct vnode *dvp,
1936 struct vnode *vp, int samedir, struct componentname *cnp)
1937{
1938 int error;
1939
1940 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_rename_to");
1941 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_rename_to");
1942
1943 if (!mac_enforce_fs)
1944 return (0);
1945
1946 error = vn_refreshlabel(dvp, cred);
1947 if (error)
1948 return (error);
1949 if (vp != NULL) {
1950 error = vn_refreshlabel(vp, cred);
1951 if (error)
1952 return (error);
1953 }
1954 MAC_CHECK(check_vnode_rename_to, cred, dvp, &dvp->v_label, vp,
1955 vp != NULL ? &vp->v_label : NULL, samedir, cnp);
1956 return (error);
1957}
1958
1959int
1960mac_check_vnode_revoke(struct ucred *cred, struct vnode *vp)
1961{
1962 int error;
1963
1964 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_revoke");
1965
1966 if (!mac_enforce_fs)
1967 return (0);
1968
1969 error = vn_refreshlabel(vp, cred);
1970 if (error)
1971 return (error);
1972
1973 MAC_CHECK(check_vnode_revoke, cred, vp, &vp->v_label);
1974 return (error);
1975}
1976
1977int
1978mac_check_vnode_setacl(struct ucred *cred, struct vnode *vp, acl_type_t type,
1979 struct acl *acl)
1980{
1981 int error;
1982
1983 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setacl");
1984
1985 if (!mac_enforce_fs)
1986 return (0);
1987
1988 error = vn_refreshlabel(vp, cred);
1989 if (error)
1990 return (error);
1991
1992 MAC_CHECK(check_vnode_setacl, cred, vp, &vp->v_label, type, acl);
1993 return (error);
1994}
1995
1996int
1997mac_check_vnode_setextattr(struct ucred *cred, struct vnode *vp,
1998 int attrnamespace, const char *name, struct uio *uio)
1999{
2000 int error;
2001
2002 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setextattr");
2003
2004 if (!mac_enforce_fs)
2005 return (0);
2006
2007 error = vn_refreshlabel(vp, cred);
2008 if (error)
2009 return (error);
2010
2011 MAC_CHECK(check_vnode_setextattr, cred, vp, &vp->v_label,
2012 attrnamespace, name, uio);
2013 return (error);
2014}
2015
2016int
2017mac_check_vnode_setflags(struct ucred *cred, struct vnode *vp, u_long flags)
2018{
2019 int error;
2020
2021 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setflags");
2022
2023 if (!mac_enforce_fs)
2024 return (0);
2025
2026 error = vn_refreshlabel(vp, cred);
2027 if (error)
2028 return (error);
2029
2030 MAC_CHECK(check_vnode_setflags, cred, vp, &vp->v_label, flags);
2031 return (error);
2032}
2033
2034int
2035mac_check_vnode_setmode(struct ucred *cred, struct vnode *vp, mode_t mode)
2036{
2037 int error;
2038
2039 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setmode");
2040
2041 if (!mac_enforce_fs)
2042 return (0);
2043
2044 error = vn_refreshlabel(vp, cred);
2045 if (error)
2046 return (error);
2047
2048 MAC_CHECK(check_vnode_setmode, cred, vp, &vp->v_label, mode);
2049 return (error);
2050}
2051
2052int
2053mac_check_vnode_setowner(struct ucred *cred, struct vnode *vp, uid_t uid,
2054 gid_t gid)
2055{
2056 int error;
2057
2058 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setowner");
2059
2060 if (!mac_enforce_fs)
2061 return (0);
2062
2063 error = vn_refreshlabel(vp, cred);
2064 if (error)
2065 return (error);
2066
2067 MAC_CHECK(check_vnode_setowner, cred, vp, &vp->v_label, uid, gid);
2068 return (error);
2069}
2070
2071int
2072mac_check_vnode_setutimes(struct ucred *cred, struct vnode *vp,
2073 struct timespec atime, struct timespec mtime)
2074{
2075 int error;
2076
2077 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setutimes");
2078
2079 if (!mac_enforce_fs)
2080 return (0);
2081
2082 error = vn_refreshlabel(vp, cred);
2083 if (error)
2084 return (error);
2085
2086 MAC_CHECK(check_vnode_setutimes, cred, vp, &vp->v_label, atime,
2087 mtime);
2088 return (error);
2089}
2090
2091int
2092mac_check_vnode_stat(struct ucred *active_cred, struct ucred *file_cred,
2093 struct vnode *vp)
2094{
2095 int error;
2096
2097 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_stat");
2098
2099 if (!mac_enforce_fs)
2100 return (0);
2101
2102 error = vn_refreshlabel(vp, active_cred);
2103 if (error)
2104 return (error);
2105
2106 MAC_CHECK(check_vnode_stat, active_cred, file_cred, vp,
2107 &vp->v_label);
2108 return (error);
2109}
2110
2111int
2112mac_check_vnode_write(struct ucred *active_cred, struct ucred *file_cred,
2113 struct vnode *vp)
2114{
2115 int error;
2116
2117 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_write");
2118
2119 if (!mac_enforce_fs)
2120 return (0);
2121
2122 error = vn_refreshlabel(vp, active_cred);
2123 if (error)
2124 return (error);
2125
2126 MAC_CHECK(check_vnode_write, active_cred, file_cred, vp,
2127 &vp->v_label);
2128
2129 return (error);
2130}
2131
2132/*
2133 * When relabeling a process, call out to the policies for the maximum
2134 * permission allowed for each object type we know about in its
2135 * memory space, and revoke access (in the least surprising ways we
2136 * know) when necessary. The process lock is not held here.
2137 */
2138static void
2139mac_cred_mmapped_drop_perms(struct thread *td, struct ucred *cred)
2140{
2141
2142 /* XXX freeze all other threads */
2143 mac_cred_mmapped_drop_perms_recurse(td, cred,
2144 &td->td_proc->p_vmspace->vm_map);
2145 /* XXX allow other threads to continue */
2146}
2147
2148static __inline const char *
2149prot2str(vm_prot_t prot)
2150{
2151
2152 switch (prot & VM_PROT_ALL) {
2153 case VM_PROT_READ:
2154 return ("r--");
2155 case VM_PROT_READ | VM_PROT_WRITE:
2156 return ("rw-");
2157 case VM_PROT_READ | VM_PROT_EXECUTE:
2158 return ("r-x");
2159 case VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE:
2160 return ("rwx");
2161 case VM_PROT_WRITE:
2162 return ("-w-");
2163 case VM_PROT_EXECUTE:
2164 return ("--x");
2165 case VM_PROT_WRITE | VM_PROT_EXECUTE:
2166 return ("-wx");
2167 default:
2168 return ("---");
2169 }
2170}
2171
2172static void
2173mac_cred_mmapped_drop_perms_recurse(struct thread *td, struct ucred *cred,
2174 struct vm_map *map)
2175{
2176 struct vm_map_entry *vme;
2177 vm_prot_t result, revokeperms;
2178 vm_object_t object;
2179 vm_ooffset_t offset;
2180 struct vnode *vp;
2181
2182 if (!mac_mmap_revocation)
2183 return;
2184
2185 vm_map_lock_read(map);
2186 for (vme = map->header.next; vme != &map->header; vme = vme->next) {
2187 if (vme->eflags & MAP_ENTRY_IS_SUB_MAP) {
2188 mac_cred_mmapped_drop_perms_recurse(td, cred,
2189 vme->object.sub_map);
2190 continue;
2191 }
2192 /*
2193 * Skip over entries that obviously are not shared.
2194 */
2195 if (vme->eflags & (MAP_ENTRY_COW | MAP_ENTRY_NOSYNC) ||
2196 !vme->max_protection)
2197 continue;
2198 /*
2199 * Drill down to the deepest backing object.
2200 */
2201 offset = vme->offset;
2202 object = vme->object.vm_object;
2203 if (object == NULL)
2204 continue;
2205 while (object->backing_object != NULL) {
2206 object = object->backing_object;
2207 offset += object->backing_object_offset;
2208 }
2209 /*
2210 * At the moment, vm_maps and objects aren't considered
2211 * by the MAC system, so only things with backing by a
2212 * normal object (read: vnodes) are checked.
2213 */
2214 if (object->type != OBJT_VNODE)
2215 continue;
2216 vp = (struct vnode *)object->handle;
2217 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
2218 result = mac_check_vnode_mmap_prot(cred, vp, 0);
2219 VOP_UNLOCK(vp, 0, td);
2220 /*
2221 * Find out what maximum protection we may be allowing
2222 * now but a policy needs to get removed.
2223 */
2224 revokeperms = vme->max_protection & ~result;
2225 if (!revokeperms)
2226 continue;
2227 printf("pid %ld: revoking %s perms from %#lx:%ld "
2228 "(max %s/cur %s)\n", (long)td->td_proc->p_pid,
2229 prot2str(revokeperms), (u_long)vme->start,
2230 (long)(vme->end - vme->start),
2231 prot2str(vme->max_protection), prot2str(vme->protection));
2232 vm_map_lock_upgrade(map);
2233 /*
2234 * This is the really simple case: if a map has more
2235 * max_protection than is allowed, but it's not being
2236 * actually used (that is, the current protection is
2237 * still allowed), we can just wipe it out and do
2238 * nothing more.
2239 */
2240 if ((vme->protection & revokeperms) == 0) {
2241 vme->max_protection -= revokeperms;
2242 } else {
2243 if (revokeperms & VM_PROT_WRITE) {
2244 /*
2245 * In the more complicated case, flush out all
2246 * pending changes to the object then turn it
2247 * copy-on-write.
2248 */
2249 vm_object_reference(object);
2250 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
2251 vm_object_page_clean(object,
2252 OFF_TO_IDX(offset),
2253 OFF_TO_IDX(offset + vme->end - vme->start +
2254 PAGE_MASK),
2255 OBJPC_SYNC);
2256 VOP_UNLOCK(vp, 0, td);
2257 vm_object_deallocate(object);
2258 /*
2259 * Why bother if there's no read permissions
2260 * anymore? For the rest, we need to leave
2261 * the write permissions on for COW, or
2262 * remove them entirely if configured to.
2263 */
2264 if (!mac_mmap_revocation_via_cow) {
2265 vme->max_protection &= ~VM_PROT_WRITE;
2266 vme->protection &= ~VM_PROT_WRITE;
2267 } if ((revokeperms & VM_PROT_READ) == 0)
2268 vme->eflags |= MAP_ENTRY_COW |
2269 MAP_ENTRY_NEEDS_COPY;
2270 }
2271 if (revokeperms & VM_PROT_EXECUTE) {
2272 vme->max_protection &= ~VM_PROT_EXECUTE;
2273 vme->protection &= ~VM_PROT_EXECUTE;
2274 }
2275 if (revokeperms & VM_PROT_READ) {
2276 vme->max_protection = 0;
2277 vme->protection = 0;
2278 }
2279 pmap_protect(map->pmap, vme->start, vme->end,
2280 vme->protection & ~revokeperms);
2281 vm_map_simplify_entry(map, vme);
2282 }
2283 vm_map_lock_downgrade(map);
2284 }
2285 vm_map_unlock_read(map);
2286}
2287
2288/*
2289 * When the subject's label changes, it may require revocation of privilege
2290 * to mapped objects. This can't be done on-the-fly later with a unified
2291 * buffer cache.
2292 */
2293static void
2294mac_relabel_cred(struct ucred *cred, struct label *newlabel)
2295{
2296
2297 MAC_PERFORM(relabel_cred, cred, newlabel);
2298}
2299
2300void
2301mac_relabel_vnode(struct ucred *cred, struct vnode *vp, struct label *newlabel)
2302{
2303
2304 MAC_PERFORM(relabel_vnode, cred, vp, &vp->v_label, newlabel);
2305}
2306
2307void
2308mac_create_ifnet(struct ifnet *ifnet)
2309{
2310
2311 MAC_PERFORM(create_ifnet, ifnet, &ifnet->if_label);
2312}
2313
2314void
2315mac_create_bpfdesc(struct ucred *cred, struct bpf_d *bpf_d)
2316{
2317
2318 MAC_PERFORM(create_bpfdesc, cred, bpf_d, &bpf_d->bd_label);
2319}
2320
2321void
2322mac_create_socket(struct ucred *cred, struct socket *socket)
2323{
2324
2325 MAC_PERFORM(create_socket, cred, socket, &socket->so_label);
2326}
2327
2328void
2329mac_create_pipe(struct ucred *cred, struct pipe *pipe)
2330{
2331
2332 MAC_PERFORM(create_pipe, cred, pipe, pipe->pipe_label);
2333}
2334
2335void
2336mac_create_socket_from_socket(struct socket *oldsocket,
2337 struct socket *newsocket)
2338{
2339
2340 MAC_PERFORM(create_socket_from_socket, oldsocket, &oldsocket->so_label,
2341 newsocket, &newsocket->so_label);
2342}
2343
2344static void
2345mac_relabel_socket(struct ucred *cred, struct socket *socket,
2346 struct label *newlabel)
2347{
2348
2349 MAC_PERFORM(relabel_socket, cred, socket, &socket->so_label, newlabel);
2350}
2351
2352static void
2353mac_relabel_pipe(struct ucred *cred, struct pipe *pipe, struct label *newlabel)
2354{
2355
2356 MAC_PERFORM(relabel_pipe, cred, pipe, pipe->pipe_label, newlabel);
2357}
2358
2359void
2360mac_set_socket_peer_from_mbuf(struct mbuf *mbuf, struct socket *socket)
2361{
2362
2363 MAC_PERFORM(set_socket_peer_from_mbuf, mbuf, &mbuf->m_pkthdr.label,
2364 socket, &socket->so_peerlabel);
2365}
2366
2367void
2368mac_set_socket_peer_from_socket(struct socket *oldsocket,
2369 struct socket *newsocket)
2370{
2371
2372 MAC_PERFORM(set_socket_peer_from_socket, oldsocket,
2373 &oldsocket->so_label, newsocket, &newsocket->so_peerlabel);
2374}
2375
2376void
2377mac_create_datagram_from_ipq(struct ipq *ipq, struct mbuf *datagram)
2378{
2379
2380 MAC_PERFORM(create_datagram_from_ipq, ipq, &ipq->ipq_label,
2381 datagram, &datagram->m_pkthdr.label);
2382}
2383
2384void
2385mac_create_fragment(struct mbuf *datagram, struct mbuf *fragment)
2386{
2387
2388 MAC_PERFORM(create_fragment, datagram, &datagram->m_pkthdr.label,
2389 fragment, &fragment->m_pkthdr.label);
2390}
2391
2392void
2393mac_create_ipq(struct mbuf *fragment, struct ipq *ipq)
2394{
2395
2396 MAC_PERFORM(create_ipq, fragment, &fragment->m_pkthdr.label, ipq,
2397 &ipq->ipq_label);
2398}
2399
2400void
2401mac_create_mbuf_from_mbuf(struct mbuf *oldmbuf, struct mbuf *newmbuf)
2402{
2403
2404 MAC_PERFORM(create_mbuf_from_mbuf, oldmbuf, &oldmbuf->m_pkthdr.label,
2405 newmbuf, &newmbuf->m_pkthdr.label);
2406}
2407
2408void
2409mac_create_mbuf_from_bpfdesc(struct bpf_d *bpf_d, struct mbuf *mbuf)
2410{
2411
2412 MAC_PERFORM(create_mbuf_from_bpfdesc, bpf_d, &bpf_d->bd_label, mbuf,
2413 &mbuf->m_pkthdr.label);
2414}
2415
2416void
2417mac_create_mbuf_linklayer(struct ifnet *ifnet, struct mbuf *mbuf)
2418{
2419
2420 MAC_PERFORM(create_mbuf_linklayer, ifnet, &ifnet->if_label, mbuf,
2421 &mbuf->m_pkthdr.label);
2422}
2423
2424void
2425mac_create_mbuf_from_ifnet(struct ifnet *ifnet, struct mbuf *mbuf)
2426{
2427
2428 MAC_PERFORM(create_mbuf_from_ifnet, ifnet, &ifnet->if_label, mbuf,
2429 &mbuf->m_pkthdr.label);
2430}
2431
2432void
2433mac_create_mbuf_multicast_encap(struct mbuf *oldmbuf, struct ifnet *ifnet,
2434 struct mbuf *newmbuf)
2435{
2436
2437 MAC_PERFORM(create_mbuf_multicast_encap, oldmbuf,
2438 &oldmbuf->m_pkthdr.label, ifnet, &ifnet->if_label, newmbuf,
2439 &newmbuf->m_pkthdr.label);
2440}
2441
2442void
2443mac_create_mbuf_netlayer(struct mbuf *oldmbuf, struct mbuf *newmbuf)
2444{
2445
2446 MAC_PERFORM(create_mbuf_netlayer, oldmbuf, &oldmbuf->m_pkthdr.label,
2447 newmbuf, &newmbuf->m_pkthdr.label);
2448}
2449
2450int
2451mac_fragment_match(struct mbuf *fragment, struct ipq *ipq)
2452{
2453 int result;
2454
2455 result = 1;
2456 MAC_BOOLEAN(fragment_match, &&, fragment, &fragment->m_pkthdr.label,
2457 ipq, &ipq->ipq_label);
2458
2459 return (result);
2460}
2461
2462void
2463mac_update_ipq(struct mbuf *fragment, struct ipq *ipq)
2464{
2465
2466 MAC_PERFORM(update_ipq, fragment, &fragment->m_pkthdr.label, ipq,
2467 &ipq->ipq_label);
2468}
2469
2470void
2471mac_create_mbuf_from_socket(struct socket *socket, struct mbuf *mbuf)
2472{
2473
2474 MAC_PERFORM(create_mbuf_from_socket, socket, &socket->so_label, mbuf,
2475 &mbuf->m_pkthdr.label);
2476}
2477
2478void
2479mac_create_mount(struct ucred *cred, struct mount *mp)
2480{
2481
2482 MAC_PERFORM(create_mount, cred, mp, &mp->mnt_mntlabel,
2483 &mp->mnt_fslabel);
2484}
2485
2486void
2487mac_create_root_mount(struct ucred *cred, struct mount *mp)
2488{
2489
2490 MAC_PERFORM(create_root_mount, cred, mp, &mp->mnt_mntlabel,
2491 &mp->mnt_fslabel);
2492}
2493
2494int
2495mac_check_bpfdesc_receive(struct bpf_d *bpf_d, struct ifnet *ifnet)
2496{
2497 int error;
2498
2499 if (!mac_enforce_network)
2500 return (0);
2501
2502 MAC_CHECK(check_bpfdesc_receive, bpf_d, &bpf_d->bd_label, ifnet,
2503 &ifnet->if_label);
2504
2505 return (error);
2506}
2507
2508static int
2509mac_check_cred_relabel(struct ucred *cred, struct label *newlabel)
2510{
2511 int error;
2512
2513 MAC_CHECK(check_cred_relabel, cred, newlabel);
2514
2515 return (error);
2516}
2517
2518int
2519mac_check_cred_visible(struct ucred *u1, struct ucred *u2)
2520{
2521 int error;
2522
2523 if (!mac_enforce_process)
2524 return (0);
2525
2526 MAC_CHECK(check_cred_visible, u1, u2);
2527
2528 return (error);
2529}
2530
2531int
2532mac_check_ifnet_transmit(struct ifnet *ifnet, struct mbuf *mbuf)
2533{
2534 int error;
2535
2536 if (!mac_enforce_network)
2537 return (0);
2538
2539 KASSERT(mbuf->m_flags & M_PKTHDR, ("packet has no pkthdr"));
2540 if (!(mbuf->m_pkthdr.label.l_flags & MAC_FLAG_INITIALIZED))
2541 printf("%s%d: not initialized\n", ifnet->if_name,
2542 ifnet->if_unit);
2543
2544 MAC_CHECK(check_ifnet_transmit, ifnet, &ifnet->if_label, mbuf,
2545 &mbuf->m_pkthdr.label);
2546
2547 return (error);
2548}
2549
2550int
2551mac_check_mount_stat(struct ucred *cred, struct mount *mount)
2552{
2553 int error;
2554
2555 if (!mac_enforce_fs)
2556 return (0);
2557
2558 MAC_CHECK(check_mount_stat, cred, mount, &mount->mnt_mntlabel);
2559
2560 return (error);
2561}
2562
2563int
2564mac_check_pipe_ioctl(struct ucred *cred, struct pipe *pipe, unsigned long cmd,
2565 void *data)
2566{
2567 int error;
2568
2569 MAC_CHECK(check_pipe_ioctl, cred, pipe, pipe->pipe_label, cmd, data);
2570
2571 return (error);
2572}
2573
2574int
2575mac_check_pipe_poll(struct ucred *cred, struct pipe *pipe)
2576{
2577 int error;
2578
2579 MAC_CHECK(check_pipe_poll, cred, pipe, pipe->pipe_label);
2580
2581 return (error);
2582}
2583
2584int
2585mac_check_pipe_read(struct ucred *cred, struct pipe *pipe)
2586{
2587 int error;
2588
2589 MAC_CHECK(check_pipe_read, cred, pipe, pipe->pipe_label);
2590
2591 return (error);
2592}
2593
2594static int
2595mac_check_pipe_relabel(struct ucred *cred, struct pipe *pipe,
2596 struct label *newlabel)
2597{
2598 int error;
2599
2600 MAC_CHECK(check_pipe_relabel, cred, pipe, pipe->pipe_label, newlabel);
2601
2602 return (error);
2603}
2604
2605int
2606mac_check_pipe_stat(struct ucred *cred, struct pipe *pipe)
2607{
2608 int error;
2609
2610 MAC_CHECK(check_pipe_stat, cred, pipe, pipe->pipe_label);
2611
2612 return (error);
2613}
2614
2615int
2616mac_check_pipe_write(struct ucred *cred, struct pipe *pipe)
2617{
2618 int error;
2619
2620 MAC_CHECK(check_pipe_write, cred, pipe, pipe->pipe_label);
2621
2622 return (error);
2623}
2624
2625int
2626mac_check_proc_debug(struct ucred *cred, struct proc *proc)
2627{
2628 int error;
2629
2630 PROC_LOCK_ASSERT(proc, MA_OWNED);
2631
2632 if (!mac_enforce_process)
2633 return (0);
2634
2635 MAC_CHECK(check_proc_debug, cred, proc);
2636
2637 return (error);
2638}
2639
2640int
2641mac_check_proc_sched(struct ucred *cred, struct proc *proc)
2642{
2643 int error;
2644
2645 PROC_LOCK_ASSERT(proc, MA_OWNED);
2646
2647 if (!mac_enforce_process)
2648 return (0);
2649
2650 MAC_CHECK(check_proc_sched, cred, proc);
2651
2652 return (error);
2653}
2654
2655int
2656mac_check_proc_signal(struct ucred *cred, struct proc *proc, int signum)
2657{
2658 int error;
2659
2660 PROC_LOCK_ASSERT(proc, MA_OWNED);
2661
2662 if (!mac_enforce_process)
2663 return (0);
2664
2665 MAC_CHECK(check_proc_signal, cred, proc, signum);
2666
2667 return (error);
2668}
2669
2670int
2671mac_check_socket_bind(struct ucred *ucred, struct socket *socket,
2672 struct sockaddr *sockaddr)
2673{
2674 int error;
2675
2676 if (!mac_enforce_socket)
2677 return (0);
2678
2679 MAC_CHECK(check_socket_bind, ucred, socket, &socket->so_label,
2680 sockaddr);
2681
2682 return (error);
2683}
2684
2685int
2686mac_check_socket_connect(struct ucred *cred, struct socket *socket,
2687 struct sockaddr *sockaddr)
2688{
2689 int error;
2690
2691 if (!mac_enforce_socket)
2692 return (0);
2693
2694 MAC_CHECK(check_socket_connect, cred, socket, &socket->so_label,
2695 sockaddr);
2696
2697 return (error);
2698}
2699
2700int
2701mac_check_socket_deliver(struct socket *socket, struct mbuf *mbuf)
2702{
2703 int error;
2704
2705 if (!mac_enforce_socket)
2706 return (0);
2707
2708 MAC_CHECK(check_socket_deliver, socket, &socket->so_label, mbuf,
2709 &mbuf->m_pkthdr.label);
2710
2711 return (error);
2712}
2713
2714int
2715mac_check_socket_listen(struct ucred *cred, struct socket *socket)
2716{
2717 int error;
2718
2719 if (!mac_enforce_socket)
2720 return (0);
2721
2722 MAC_CHECK(check_socket_listen, cred, socket, &socket->so_label);
2723 return (error);
2724}
2725
2726static int
2727mac_check_socket_relabel(struct ucred *cred, struct socket *socket,
2728 struct label *newlabel)
2729{
2730 int error;
2731
2732 MAC_CHECK(check_socket_relabel, cred, socket, &socket->so_label,
2733 newlabel);
2734
2735 return (error);
2736}
2737
2738int
2739mac_check_socket_visible(struct ucred *cred, struct socket *socket)
2740{
2741 int error;
2742
2743 if (!mac_enforce_socket)
2744 return (0);
2745
2746 MAC_CHECK(check_socket_visible, cred, socket, &socket->so_label);
2747
2748 return (error);
2749}
2750
2751int
2752mac_ioctl_ifnet_get(struct ucred *cred, struct ifreq *ifr,
2753 struct ifnet *ifnet)
2754{
2755 struct mac label;
2756 int error;
2757
2758 error = mac_externalize(&ifnet->if_label, &label);
2759 if (error)
2760 return (error);
2761
2762 return (copyout(&label, ifr->ifr_ifru.ifru_data, sizeof(label)));
2763}
2764
2765int
2766mac_ioctl_ifnet_set(struct ucred *cred, struct ifreq *ifr,
2767 struct ifnet *ifnet)
2768{
2769 struct mac newlabel;
2770 struct label intlabel;
2771 int error;
2772
2773 error = copyin(ifr->ifr_ifru.ifru_data, &newlabel, sizeof(newlabel));
2774 if (error)
2775 return (error);
2776
2777 error = mac_internalize(&intlabel, &newlabel);
2778 if (error)
2779 return (error);
2780
2781 /*
2782 * XXX: Note that this is a redundant privilege check, since
2783 * policies impose this check themselves if required by the
2784 * policy. Eventually, this should go away.
2785 */
2786 error = suser_cred(cred, 0);
2787 if (error)
2788 goto out;
2789
2790 MAC_CHECK(check_ifnet_relabel, cred, ifnet, &ifnet->if_label,
2791 &intlabel);
2792 if (error)
2793 goto out;
2794
2795 MAC_PERFORM(relabel_ifnet, cred, ifnet, &ifnet->if_label, &intlabel);
2796
2797out:
2798 mac_destroy_temp(&intlabel);
2799 return (error);
2800}
2801
2802void
2803mac_create_devfs_vnode(struct devfs_dirent *de, struct vnode *vp)
2804{
2805
2806 MAC_PERFORM(create_devfs_vnode, de, &de->de_label, vp, &vp->v_label);
2807}
2808
2809void
2810mac_create_devfs_device(dev_t dev, struct devfs_dirent *de)
2811{
2812
2813 MAC_PERFORM(create_devfs_device, dev, de, &de->de_label);
2814}
2815
2816static int
2817mac_stdcreatevnode_ea(struct vnode *vp)
2818{
2819 int error;
2820
2821 MAC_CHECK(stdcreatevnode_ea, vp, &vp->v_label);
2822
2823 return (error);
2824}
2825
2826void
2827mac_create_devfs_directory(char *dirname, int dirnamelen,
2828 struct devfs_dirent *de)
2829{
2830
2831 MAC_PERFORM(create_devfs_directory, dirname, dirnamelen, de,
2832 &de->de_label);
2833}
2834
2835/*
2836 * When a new vnode is created, this call will initialize its label.
2837 */
2838void
2839mac_create_vnode(struct ucred *cred, struct vnode *parent,
2840 struct vnode *child)
2841{
2842 int error;
2843
2844 ASSERT_VOP_LOCKED(parent, "mac_create_vnode");
2845 ASSERT_VOP_LOCKED(child, "mac_create_vnode");
2846
2847 error = vn_refreshlabel(parent, cred);
2848 if (error) {
2849 printf("mac_create_vnode: vn_refreshlabel returned %d\n",
2850 error);
2851 printf("mac_create_vnode: using old vnode label\n");
2852 }
2853
2854 MAC_PERFORM(create_vnode, cred, parent, &parent->v_label, child,
2855 &child->v_label);
2856}
2857
2858int
2859mac_setsockopt_label_set(struct ucred *cred, struct socket *so,
2860 struct mac *extmac)
2861{
2862 struct label intlabel;
2863 int error;
2864
2865 error = mac_internalize(&intlabel, extmac);
2866 if (error)
2867 return (error);
2868
2869 mac_check_socket_relabel(cred, so, &intlabel);
2870 if (error) {
2871 mac_destroy_temp(&intlabel);
2872 return (error);
2873 }
2874
2875 mac_relabel_socket(cred, so, &intlabel);
2876
2877 mac_destroy_temp(&intlabel);
2878 return (0);
2879}
2880
2881int
2882mac_pipe_label_set(struct ucred *cred, struct pipe *pipe, struct label *label)
2883{
2884 int error;
2885
2886 error = mac_check_pipe_relabel(cred, pipe, label);
2887 if (error)
2888 return (error);
2889
2890 mac_relabel_pipe(cred, pipe, label);
2891
2892 return (0);
2893}
2894
2895int
2896mac_getsockopt_label_get(struct ucred *cred, struct socket *so,
2897 struct mac *extmac)
2898{
2899
2900 return (mac_externalize(&so->so_label, extmac));
2901}
2902
2903int
2904mac_getsockopt_peerlabel_get(struct ucred *cred, struct socket *so,
2905 struct mac *extmac)
2906{
2907
2908 return (mac_externalize(&so->so_peerlabel, extmac));
2909}
2910
2911/*
2912 * Implementation of VOP_SETLABEL() that relies on extended attributes
2913 * to store label data. Can be referenced by filesystems supporting
2914 * extended attributes.
2915 */
2916int
2917vop_stdsetlabel_ea(struct vop_setlabel_args *ap)
2918{
2919 struct vnode *vp = ap->a_vp;
2920 struct label *intlabel = ap->a_label;
2921 struct mac extmac;
2922 int error;
2923
2924 ASSERT_VOP_LOCKED(vp, "vop_stdsetlabel_ea");
2925
2926 /*
2927 * XXX: Eventually call out to EA check/set calls here.
2928 * Be particularly careful to avoid race conditions,
2929 * consistency problems, and stability problems when
2930 * dealing with multiple EAs. In particular, we require
2931 * the ability to write multiple EAs on the same file in
2932 * a single transaction, which the current EA interface
2933 * does not provide.
2934 */
2935
2936 error = mac_externalize(intlabel, &extmac);
2937 if (error)
2938 return (error);
2939
2940 error = vn_extattr_set(vp, IO_NODELOCKED,
2941 FREEBSD_MAC_EXTATTR_NAMESPACE, FREEBSD_MAC_EXTATTR_NAME,
2942 sizeof(extmac), (char *)&extmac, curthread);
2943 if (error)
2944 return (error);
2945
2946 mac_relabel_vnode(ap->a_cred, vp, intlabel);
2947
2948 vp->v_vflag |= VV_CACHEDLABEL;
2949
2950 return (0);
2951}
2952
2953static int
2954vn_setlabel(struct vnode *vp, struct label *intlabel, struct ucred *cred)
2955{
2956 int error;
2957
2958 if (vp->v_mount == NULL) {
2959 /* printf("vn_setlabel: null v_mount\n"); */
2960 if (vp->v_type != VNON)
2961 printf("vn_setlabel: null v_mount with non-VNON\n");
2962 return (EBADF);
2963 }
2964
2965 if ((vp->v_mount->mnt_flag & MNT_MULTILABEL) == 0)
2966 return (EOPNOTSUPP);
2967
2968 /*
2969 * Multi-phase commit. First check the policies to confirm the
2970 * change is OK. Then commit via the filesystem. Finally,
2971 * update the actual vnode label. Question: maybe the filesystem
2972 * should update the vnode at the end as part of VOP_SETLABEL()?
2973 */
2974 error = mac_check_vnode_relabel(cred, vp, intlabel);
2975 if (error)
2976 return (error);
2977
2978 /*
2979 * VADMIN provides the opportunity for the filesystem to make
2980 * decisions about who is and is not able to modify labels
2981 * and protections on files. This might not be right. We can't
2982 * assume VOP_SETLABEL() will do it, because we might implement
2983 * that as part of vop_stdsetlabel_ea().
2984 */
2985 error = VOP_ACCESS(vp, VADMIN, cred, curthread);
2986 if (error)
2987 return (error);
2988
2989 error = VOP_SETLABEL(vp, intlabel, cred, curthread);
2990 if (error)
2991 return (error);
2992
2993 return (0);
2994}
2995
2996/*
2997 * MPSAFE
2998 */
2999int
3000__mac_get_proc(struct thread *td, struct __mac_get_proc_args *uap)
3001{
3002 struct mac extmac;
3003 int error;
3004
3005 error = mac_externalize(&td->td_ucred->cr_label, &extmac);
3006 if (error == 0)
3007 error = copyout(&extmac, SCARG(uap, mac_p), sizeof(extmac));
3008
3009 return (error);
3010}
3011
3012/*
3013 * MPSAFE
3014 */
3015int
3016__mac_set_proc(struct thread *td, struct __mac_set_proc_args *uap)
3017{
3018 struct ucred *newcred, *oldcred;
3019 struct proc *p;
3020 struct mac extmac;
3021 struct label intlabel;
3022 int error;
3023
3024 error = copyin(SCARG(uap, mac_p), &extmac, sizeof(extmac));
3025 if (error)
3026 return (error);
3027
3028 error = mac_internalize(&intlabel, &extmac);
3029 if (error)
3030 return (error);
3031
3032 newcred = crget();
3033
3034 p = td->td_proc;
3035 PROC_LOCK(p);
3036 oldcred = p->p_ucred;
3037
3038 error = mac_check_cred_relabel(oldcred, &intlabel);
3039 if (error) {
3040 PROC_UNLOCK(p);
3041 mac_destroy_temp(&intlabel);
3042 crfree(newcred);
3043 return (error);
3044 }
3045
3046 setsugid(p);
3047 crcopy(newcred, oldcred);
3048 mac_relabel_cred(newcred, &intlabel);
3049 p->p_ucred = newcred;
3050
3051 /*
3052 * Grab additional reference for use while revoking mmaps, prior
3053 * to releasing the proc lock and sharing the cred.
3054 */
3055 crhold(newcred);
3056 PROC_UNLOCK(p);
3057
3058 mtx_lock(&Giant);
3059 mac_cred_mmapped_drop_perms(td, newcred);
3060 mtx_unlock(&Giant);
3061
3062 crfree(newcred); /* Free revocation reference. */
3063 crfree(oldcred);
3064 mac_destroy_temp(&intlabel);
3065 return (0);
3066}
3067
3068/*
3069 * MPSAFE
3070 */
3071int
3072__mac_get_fd(struct thread *td, struct __mac_get_fd_args *uap)
3073{
3074 struct file *fp;
3075 struct mac extmac;
3076 struct vnode *vp;
3077 struct pipe *pipe;
3078 int error;
3079
3080 mtx_lock(&Giant);
3081
3082 error = fget(td, SCARG(uap, fd), &fp);
3083 if (error)
3084 goto out;
3085
3086 switch (fp->f_type) {
3087 case DTYPE_FIFO:
3088 case DTYPE_VNODE:
3089 vp = (struct vnode *)fp->f_data;
3090
3091 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
3092 error = vn_refreshlabel(vp, td->td_ucred);
3093 if (error == 0)
3094 error = mac_externalize(&vp->v_label, &extmac);
3095 VOP_UNLOCK(vp, 0, td);
3096 break;
3097 case DTYPE_PIPE:
3098 pipe = (struct pipe *)fp->f_data;
3099 error = mac_externalize(pipe->pipe_label, &extmac);
3100 break;
3101 default:
3102 error = EINVAL;
3103 }
3104
3105 if (error == 0)
3106 error = copyout(&extmac, SCARG(uap, mac_p), sizeof(extmac));
3107
3108 fdrop(fp, td);
3109
3110out:
3111 mtx_unlock(&Giant);
3112 return (error);
3113}
3114
3115/*
3116 * MPSAFE
3117 */
3118int
3119__mac_get_file(struct thread *td, struct __mac_get_file_args *uap)
3120{
3121 struct nameidata nd;
3122 struct mac extmac;
3123 int error;
3124
3125 mtx_lock(&Giant);
3126 NDINIT(&nd, LOOKUP, LOCKLEAF | FOLLOW, UIO_USERSPACE,
3127 SCARG(uap, path_p), td);
3128 error = namei(&nd);
3129 if (error)
3130 goto out;
3131
3132 error = vn_refreshlabel(nd.ni_vp, td->td_ucred);
3133 if (error == 0)
3134 error = mac_externalize(&nd.ni_vp->v_label, &extmac);
3135 NDFREE(&nd, 0);
3136 if (error)
3137 goto out;
3138
3139 error = copyout(&extmac, SCARG(uap, mac_p), sizeof(extmac));
3140
3141out:
3142 mtx_unlock(&Giant);
3143 return (error);
3144}
3145
3146/*
3147 * MPSAFE
3148 */
3149int
3150__mac_set_fd(struct thread *td, struct __mac_set_fd_args *uap)
3151{
3152 struct file *fp;
3153 struct mac extmac;
3154 struct label intlabel;
3155 struct mount *mp;
3156 struct vnode *vp;
3157 struct pipe *pipe;
3158 int error;
3159
3160 mtx_lock(&Giant);
3161 error = fget(td, SCARG(uap, fd), &fp);
3162 if (error)
3163 goto out1;
3164
3165 error = copyin(SCARG(uap, mac_p), &extmac, sizeof(extmac));
3166 if (error)
3167 goto out2;
3168
3169 error = mac_internalize(&intlabel, &extmac);
3170 if (error)
3171 goto out2;
3172
3173 switch (fp->f_type) {
3174 case DTYPE_FIFO:
3175 case DTYPE_VNODE:
3176 vp = (struct vnode *)fp->f_data;
3177 error = vn_start_write(vp, &mp, V_WAIT | PCATCH);
3178 if (error != 0)
3179 break;
3180
3181 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
3182 error = vn_setlabel(vp, &intlabel, td->td_ucred);
3183 VOP_UNLOCK(vp, 0, td);
3184 vn_finished_write(mp);
3185 mac_destroy_temp(&intlabel);
3186 break;
3187 case DTYPE_PIPE:
3188 pipe = (struct pipe *)fp->f_data;
3189 error = mac_pipe_label_set(td->td_ucred, pipe, &intlabel);
3190 break;
3191 default:
3192 error = EINVAL;
3193 }
3194
3195out2:
3196 fdrop(fp, td);
3197out1:
3198 mtx_unlock(&Giant);
3199 return (error);
3200}
3201
3202/*
3203 * MPSAFE
3204 */
3205int
3206__mac_set_file(struct thread *td, struct __mac_set_file_args *uap)
3207{
3208 struct nameidata nd;
3209 struct mac extmac;
3210 struct label intlabel;
3211 struct mount *mp;
3212 int error;
3213
3214 mtx_lock(&Giant);
3215
3216 error = copyin(SCARG(uap, mac_p), &extmac, sizeof(extmac));
3217 if (error)
3218 goto out;
3219
3220 error = mac_internalize(&intlabel, &extmac);
3221 if (error)
3222 goto out;
3223
3224 NDINIT(&nd, LOOKUP, LOCKLEAF | FOLLOW, UIO_USERSPACE,
3225 SCARG(uap, path_p), td);
3226 error = namei(&nd);
3227 if (error)
3228 goto out2;
3229 error = vn_start_write(nd.ni_vp, &mp, V_WAIT | PCATCH);
3230 if (error)
3231 goto out2;
3232
3233 error = vn_setlabel(nd.ni_vp, &intlabel, td->td_ucred);
3234
3235 vn_finished_write(mp);
3236out2:
3237 mac_destroy_temp(&intlabel);
3238 NDFREE(&nd, 0);
3239out:
3240 mtx_unlock(&Giant);
3241 return (error);
3242}
3243
3244int
3245mac_syscall(struct thread *td, struct mac_syscall_args *uap)
3246{
3247 struct mac_policy_conf *mpc;
3248 char target[MAC_MAX_POLICY_NAME];
3249 int error;
3250
3251 error = copyinstr(SCARG(uap, policy), target, sizeof(target), NULL);
3252 if (error)
3253 return (error);
3254
3255 error = ENOSYS;
3256 MAC_POLICY_LIST_BUSY();
3257 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) {
3258 if (strcmp(mpc->mpc_name, target) == 0 &&
3259 mpc->mpc_ops->mpo_syscall != NULL) {
3260 error = mpc->mpc_ops->mpo_syscall(td,
3261 SCARG(uap, call), SCARG(uap, arg));
3262 goto out;
3263 }
3264 }
3265
3266out:
3267 MAC_POLICY_LIST_UNBUSY();
3268 return (error);
3269}
3270
3271SYSINIT(mac, SI_SUB_MAC, SI_ORDER_FIRST, mac_init, NULL);
3272SYSINIT(mac_late, SI_SUB_MAC_LATE, SI_ORDER_FIRST, mac_late_init, NULL);
3273
3274#else /* !MAC */
3275
3276int
3277__mac_get_proc(struct thread *td, struct __mac_get_proc_args *uap)
3278{
3279
3280 return (ENOSYS);
3281}
3282
3283int
3284__mac_set_proc(struct thread *td, struct __mac_set_proc_args *uap)
3285{
3286
3287 return (ENOSYS);
3288}
3289
3290int
3291__mac_get_fd(struct thread *td, struct __mac_get_fd_args *uap)
3292{
3293
3294 return (ENOSYS);
3295}
3296
3297int
3298__mac_get_file(struct thread *td, struct __mac_get_file_args *uap)
3299{
3300
3301 return (ENOSYS);
3302}
3303
3304int
3305__mac_set_fd(struct thread *td, struct __mac_set_fd_args *uap)
3306{
3307
3308 return (ENOSYS);
3309}
3310
3311int
3312__mac_set_file(struct thread *td, struct __mac_set_file_args *uap)
3313{
3314
3315 return (ENOSYS);
3316}
3317
3318int
3319mac_syscall(struct thread *td, struct mac_syscall_args *uap)
3320{
3321
3322 return (ENOSYS);
3323}
3324
3325#endif /* !MAC */