1 /*-
2 * Copyright (c) 1999-2002, 2007, 2009, 2019 Robert N. M. Watson
3 * Copyright (c) 2001 Ilmar S. Habibulin
4 * Copyright (c) 2001-2004 Networks Associates Technology, Inc.
5 * Copyright (c) 2006 SPARTA, Inc.
6 * Copyright (c) 2008 Apple Inc.
7 * All rights reserved.
8 *
9 * This software was developed by Robert Watson and Ilmar Habibulin for the
10 * TrustedBSD Project.
11 *
12 * This software was developed for the FreeBSD Project in part by Network
13 * Associates Laboratories, the Security Research Division of Network
14 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
15 * as part of the DARPA CHATS research program.
16 *
17 * This software was enhanced by SPARTA ISSO under SPAWAR contract
18 * N66001-04-C-6019 ("SEFOS").
19 *
20 * This software was developed at the University of Cambridge Computer
21 * Laboratory with support from a grant from Google, Inc.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the above copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 *
32 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
33 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
34 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
35 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
36 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
37 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
38 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
39 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
40 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
41 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
42 * SUCH DAMAGE.
43 */
44
45 #include <sys/cdefs.h>
46 __FBSDID("$FreeBSD$");
47
48 #include "opt_mac.h"
49
50 #include <sys/param.h>
51 #include <sys/kernel.h>
52 #include <sys/lock.h>
53 #include <sys/malloc.h>
54 #include <sys/mutex.h>
55 #include <sys/sbuf.h>
56 #include <sys/sdt.h>
57 #include <sys/systm.h>
58 #include <sys/mount.h>
59 #include <sys/file.h>
60 #include <sys/namei.h>
61 #include <sys/protosw.h>
62 #include <sys/socket.h>
63 #include <sys/socketvar.h>
64 #include <sys/sysctl.h>
65
66 #include <net/if.h>
67 #include <net/if_var.h>
68
69 #include <netinet/in.h>
70 #include <netinet/in_pcb.h>
71 #include <netinet/ip_var.h>
72
73 #include <security/mac/mac_framework.h>
74 #include <security/mac/mac_internal.h>
75 #include <security/mac/mac_policy.h>
76
77 static struct label *
78 mac_inpcb_label_alloc(int flag)
79 {
80 struct label *label;
81 int error;
82
83 label = mac_labelzone_alloc(flag);
84 if (label == NULL)
85 return (NULL);
86 if (flag & M_WAITOK)
87 MAC_POLICY_CHECK(inpcb_init_label, label, flag);
88 else
89 MAC_POLICY_CHECK_NOSLEEP(inpcb_init_label, label, flag);
90 if (error) {
91 MAC_POLICY_PERFORM_NOSLEEP(inpcb_destroy_label, label);
92 mac_labelzone_free(label);
93 return (NULL);
94 }
95 return (label);
96 }
97
98 int
99 mac_inpcb_init(struct inpcb *inp, int flag)
100 {
101
102 if (mac_labeled & MPC_OBJECT_INPCB) {
103 inp->inp_label = mac_inpcb_label_alloc(flag);
104 if (inp->inp_label == NULL)
105 return (ENOMEM);
106 } else
107 inp->inp_label = NULL;
108 return (0);
109 }
110
111 static struct label *
112 mac_ipq_label_alloc(int flag)
113 {
114 struct label *label;
115 int error;
116
117 label = mac_labelzone_alloc(flag);
118 if (label == NULL)
119 return (NULL);
120
121 if (flag & M_WAITOK)
122 MAC_POLICY_CHECK(ipq_init_label, label, flag);
123 else
124 MAC_POLICY_CHECK_NOSLEEP(ipq_init_label, label, flag);
125 if (error) {
126 MAC_POLICY_PERFORM_NOSLEEP(ipq_destroy_label, label);
127 mac_labelzone_free(label);
128 return (NULL);
129 }
130 return (label);
131 }
132
133 int
134 mac_ipq_init(struct ipq *q, int flag)
135 {
136
137 if (mac_labeled & MPC_OBJECT_IPQ) {
138 q->ipq_label = mac_ipq_label_alloc(flag);
139 if (q->ipq_label == NULL)
140 return (ENOMEM);
141 } else
142 q->ipq_label = NULL;
143 return (0);
144 }
145
146 static void
147 mac_inpcb_label_free(struct label *label)
148 {
149
150 MAC_POLICY_PERFORM_NOSLEEP(inpcb_destroy_label, label);
151 mac_labelzone_free(label);
152 }
153
154 void
155 mac_inpcb_destroy(struct inpcb *inp)
156 {
157
158 if (inp->inp_label != NULL) {
159 mac_inpcb_label_free(inp->inp_label);
160 inp->inp_label = NULL;
161 }
162 }
163
164 static void
165 mac_ipq_label_free(struct label *label)
166 {
167
168 MAC_POLICY_PERFORM_NOSLEEP(ipq_destroy_label, label);
169 mac_labelzone_free(label);
170 }
171
172 void
173 mac_ipq_destroy(struct ipq *q)
174 {
175
176 if (q->ipq_label != NULL) {
177 mac_ipq_label_free(q->ipq_label);
178 q->ipq_label = NULL;
179 }
180 }
181
182 void
183 mac_inpcb_create(struct socket *so, struct inpcb *inp)
184 {
185
186 MAC_POLICY_PERFORM_NOSLEEP(inpcb_create, so, so->so_label, inp,
187 inp->inp_label);
188 }
189
190 void
191 mac_ipq_reassemble(struct ipq *q, struct mbuf *m)
192 {
193 struct label *label;
194
195 if (mac_policy_count == 0)
196 return;
197
198 label = mac_mbuf_to_label(m);
199
200 MAC_POLICY_PERFORM_NOSLEEP(ipq_reassemble, q, q->ipq_label, m,
201 label);
202 }
203
204 void
205 mac_netinet_fragment(struct mbuf *m, struct mbuf *frag)
206 {
207 struct label *mlabel, *fraglabel;
208
209 if (mac_policy_count == 0)
210 return;
211
212 mlabel = mac_mbuf_to_label(m);
213 fraglabel = mac_mbuf_to_label(frag);
214
215 MAC_POLICY_PERFORM_NOSLEEP(netinet_fragment, m, mlabel, frag,
216 fraglabel);
217 }
218
219 void
220 mac_ipq_create(struct mbuf *m, struct ipq *q)
221 {
222 struct label *label;
223
224 if (mac_policy_count == 0)
225 return;
226
227 label = mac_mbuf_to_label(m);
228
229 MAC_POLICY_PERFORM_NOSLEEP(ipq_create, m, label, q, q->ipq_label);
230 }
231
232 void
233 mac_inpcb_create_mbuf(struct inpcb *inp, struct mbuf *m)
234 {
235 struct label *mlabel;
236
237 INP_LOCK_ASSERT(inp);
238
239 if (mac_policy_count == 0)
240 return;
241
242 mlabel = mac_mbuf_to_label(m);
243
244 MAC_POLICY_PERFORM_NOSLEEP(inpcb_create_mbuf, inp, inp->inp_label, m,
245 mlabel);
246 }
247
248 int
249 mac_ipq_match(struct mbuf *m, struct ipq *q)
250 {
251 struct label *label;
252 int result;
253
254 if (mac_policy_count == 0)
255 return (1);
256
257 label = mac_mbuf_to_label(m);
258
259 result = 1;
260 MAC_POLICY_BOOLEAN_NOSLEEP(ipq_match, &&, m, label, q, q->ipq_label);
261
262 return (result);
263 }
264
265 void
266 mac_netinet_arp_send(struct ifnet *ifp, struct mbuf *m)
267 {
268 struct label *mlabel;
269 int locked;
270
271 if (mac_policy_count == 0)
272 return;
273
274 mlabel = mac_mbuf_to_label(m);
275
276 MAC_IFNET_LOCK(ifp, locked);
277 MAC_POLICY_PERFORM_NOSLEEP(netinet_arp_send, ifp, ifp->if_label, m,
278 mlabel);
279 MAC_IFNET_UNLOCK(ifp, locked);
280 }
281
282 void
283 mac_netinet_icmp_reply(struct mbuf *mrecv, struct mbuf *msend)
284 {
285 struct label *mrecvlabel, *msendlabel;
286
287 if (mac_policy_count == 0)
288 return;
289
290 mrecvlabel = mac_mbuf_to_label(mrecv);
291 msendlabel = mac_mbuf_to_label(msend);
292
293 MAC_POLICY_PERFORM_NOSLEEP(netinet_icmp_reply, mrecv, mrecvlabel,
294 msend, msendlabel);
295 }
296
297 void
298 mac_netinet_icmp_replyinplace(struct mbuf *m)
299 {
300 struct label *label;
301
302 if (mac_policy_count == 0)
303 return;
304
305 label = mac_mbuf_to_label(m);
306
307 MAC_POLICY_PERFORM_NOSLEEP(netinet_icmp_replyinplace, m, label);
308 }
309
310 void
311 mac_netinet_igmp_send(struct ifnet *ifp, struct mbuf *m)
312 {
313 struct label *mlabel;
314 int locked;
315
316 if (mac_policy_count == 0)
317 return;
318
319 mlabel = mac_mbuf_to_label(m);
320
321 MAC_IFNET_LOCK(ifp, locked);
322 MAC_POLICY_PERFORM_NOSLEEP(netinet_igmp_send, ifp, ifp->if_label, m,
323 mlabel);
324 MAC_IFNET_UNLOCK(ifp, locked);
325 }
326
327 void
328 mac_netinet_tcp_reply(struct mbuf *m)
329 {
330 struct label *label;
331
332 if (mac_policy_count == 0)
333 return;
334
335 label = mac_mbuf_to_label(m);
336
337 MAC_POLICY_PERFORM_NOSLEEP(netinet_tcp_reply, m, label);
338 }
339
340 void
341 mac_ipq_update(struct mbuf *m, struct ipq *q)
342 {
343 struct label *label;
344
345 if (mac_policy_count == 0)
346 return;
347
348 label = mac_mbuf_to_label(m);
349
350 MAC_POLICY_PERFORM_NOSLEEP(ipq_update, m, label, q, q->ipq_label);
351 }
352
353 MAC_CHECK_PROBE_DEFINE2(inpcb_check_deliver, "struct inpcb *",
354 "struct mbuf *");
355
356 int
357 mac_inpcb_check_deliver(struct inpcb *inp, struct mbuf *m)
358 {
359 struct label *label;
360 int error;
361
362 M_ASSERTPKTHDR(m);
363
364 if (mac_policy_count == 0)
365 return (0);
366
367 label = mac_mbuf_to_label(m);
368
369 MAC_POLICY_CHECK_NOSLEEP(inpcb_check_deliver, inp, inp->inp_label, m,
370 label);
371 MAC_CHECK_PROBE2(inpcb_check_deliver, error, inp, m);
372
373 return (error);
374 }
375
376 MAC_CHECK_PROBE_DEFINE2(inpcb_check_visible, "struct ucred *",
377 "struct inpcb *");
378
379 int
380 mac_inpcb_check_visible(struct ucred *cred, struct inpcb *inp)
381 {
382 int error;
383
384 INP_LOCK_ASSERT(inp);
385
386 MAC_POLICY_CHECK_NOSLEEP(inpcb_check_visible, cred, inp,
387 inp->inp_label);
388 MAC_CHECK_PROBE2(inpcb_check_visible, error, cred, inp);
389
390 return (error);
391 }
392
393 void
394 mac_inpcb_sosetlabel(struct socket *so, struct inpcb *inp)
395 {
396
397 INP_WLOCK_ASSERT(inp);
398 SOCK_LOCK_ASSERT(so);
399
400 MAC_POLICY_PERFORM_NOSLEEP(inpcb_sosetlabel, so, so->so_label, inp,
401 inp->inp_label);
402 }
403
404 void
405 mac_netinet_firewall_reply(struct mbuf *mrecv, struct mbuf *msend)
406 {
407 struct label *mrecvlabel, *msendlabel;
408
409 M_ASSERTPKTHDR(mrecv);
410 M_ASSERTPKTHDR(msend);
411
412 if (mac_policy_count == 0)
413 return;
414
415 mrecvlabel = mac_mbuf_to_label(mrecv);
416 msendlabel = mac_mbuf_to_label(msend);
417
418 MAC_POLICY_PERFORM_NOSLEEP(netinet_firewall_reply, mrecv, mrecvlabel,
419 msend, msendlabel);
420 }
421
422 void
423 mac_netinet_firewall_send(struct mbuf *m)
424 {
425 struct label *label;
426
427 M_ASSERTPKTHDR(m);
428
429 if (mac_policy_count == 0)
430 return;
431
432 label = mac_mbuf_to_label(m);
433
434 MAC_POLICY_PERFORM_NOSLEEP(netinet_firewall_send, m, label);
435 }
436
437 /*
438 * These functions really should be referencing the syncache structure
439 * instead of the label. However, due to some of the complexities associated
440 * with exposing this syncache structure we operate directly on its label
441 * pointer. This should be OK since we aren't making any access control
442 * decisions within this code directly, we are merely allocating and copying
443 * label storage so we can properly initialize mbuf labels for any packets
444 * the syncache code might create.
445 */
446 void
447 mac_syncache_destroy(struct label **label)
448 {
449
450 if (*label != NULL) {
451 MAC_POLICY_PERFORM_NOSLEEP(syncache_destroy_label, *label);
452 mac_labelzone_free(*label);
453 *label = NULL;
454 }
455 }
456
457 int
458 mac_syncache_init(struct label **label)
459 {
460 int error;
461
462 if (mac_labeled & MPC_OBJECT_SYNCACHE) {
463 *label = mac_labelzone_alloc(M_NOWAIT);
464 if (*label == NULL)
465 return (ENOMEM);
466 /*
467 * Since we are holding the inpcb locks the policy can not
468 * allocate policy specific label storage using M_WAITOK. So
469 * we need to do a MAC_CHECK instead of the typical
470 * MAC_PERFORM so we can propagate allocation failures back
471 * to the syncache code.
472 */
473 MAC_POLICY_CHECK_NOSLEEP(syncache_init_label, *label,
474 M_NOWAIT);
475 if (error) {
476 MAC_POLICY_PERFORM_NOSLEEP(syncache_destroy_label,
477 *label);
478 mac_labelzone_free(*label);
479 }
480 return (error);
481 } else
482 *label = NULL;
483 return (0);
484 }
485
486 void
487 mac_syncache_create(struct label *label, struct inpcb *inp)
488 {
489
490 INP_WLOCK_ASSERT(inp);
491
492 MAC_POLICY_PERFORM_NOSLEEP(syncache_create, label, inp);
493 }
494
495 void
496 mac_syncache_create_mbuf(struct label *sc_label, struct mbuf *m)
497 {
498 struct label *mlabel;
499
500 M_ASSERTPKTHDR(m);
501
502 if (mac_policy_count == 0)
503 return;
504
505 mlabel = mac_mbuf_to_label(m);
506
507 MAC_POLICY_PERFORM_NOSLEEP(syncache_create_mbuf, sc_label, m,
508 mlabel);
509 }
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