1 /*-
2 * Copyright (c) 1999-2002, 2007, 2009 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: releng/11.0/sys/security/mac/mac_inet.c 258541 2013-11-25 07:38:45Z attilio $");
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
270 if (mac_policy_count == 0)
271 return;
272
273 mlabel = mac_mbuf_to_label(m);
274
275 MAC_IFNET_LOCK(ifp);
276 MAC_POLICY_PERFORM_NOSLEEP(netinet_arp_send, ifp, ifp->if_label, m,
277 mlabel);
278 MAC_IFNET_UNLOCK(ifp);
279 }
280
281 void
282 mac_netinet_icmp_reply(struct mbuf *mrecv, struct mbuf *msend)
283 {
284 struct label *mrecvlabel, *msendlabel;
285
286 if (mac_policy_count == 0)
287 return;
288
289 mrecvlabel = mac_mbuf_to_label(mrecv);
290 msendlabel = mac_mbuf_to_label(msend);
291
292 MAC_POLICY_PERFORM_NOSLEEP(netinet_icmp_reply, mrecv, mrecvlabel,
293 msend, msendlabel);
294 }
295
296 void
297 mac_netinet_icmp_replyinplace(struct mbuf *m)
298 {
299 struct label *label;
300
301 if (mac_policy_count == 0)
302 return;
303
304 label = mac_mbuf_to_label(m);
305
306 MAC_POLICY_PERFORM_NOSLEEP(netinet_icmp_replyinplace, m, label);
307 }
308
309 void
310 mac_netinet_igmp_send(struct ifnet *ifp, struct mbuf *m)
311 {
312 struct label *mlabel;
313
314 if (mac_policy_count == 0)
315 return;
316
317 mlabel = mac_mbuf_to_label(m);
318
319 MAC_IFNET_LOCK(ifp);
320 MAC_POLICY_PERFORM_NOSLEEP(netinet_igmp_send, ifp, ifp->if_label, m,
321 mlabel);
322 MAC_IFNET_UNLOCK(ifp);
323 }
324
325 void
326 mac_netinet_tcp_reply(struct mbuf *m)
327 {
328 struct label *label;
329
330 if (mac_policy_count == 0)
331 return;
332
333 label = mac_mbuf_to_label(m);
334
335 MAC_POLICY_PERFORM_NOSLEEP(netinet_tcp_reply, m, label);
336 }
337
338 void
339 mac_ipq_update(struct mbuf *m, struct ipq *q)
340 {
341 struct label *label;
342
343 if (mac_policy_count == 0)
344 return;
345
346 label = mac_mbuf_to_label(m);
347
348 MAC_POLICY_PERFORM_NOSLEEP(ipq_update, m, label, q, q->ipq_label);
349 }
350
351 MAC_CHECK_PROBE_DEFINE2(inpcb_check_deliver, "struct inpcb *",
352 "struct mbuf *");
353
354 int
355 mac_inpcb_check_deliver(struct inpcb *inp, struct mbuf *m)
356 {
357 struct label *label;
358 int error;
359
360 M_ASSERTPKTHDR(m);
361
362 if (mac_policy_count == 0)
363 return (0);
364
365 label = mac_mbuf_to_label(m);
366
367 MAC_POLICY_CHECK_NOSLEEP(inpcb_check_deliver, inp, inp->inp_label, m,
368 label);
369 MAC_CHECK_PROBE2(inpcb_check_deliver, error, inp, m);
370
371 return (error);
372 }
373
374 MAC_CHECK_PROBE_DEFINE2(inpcb_check_visible, "struct ucred *",
375 "struct inpcb *");
376
377 int
378 mac_inpcb_check_visible(struct ucred *cred, struct inpcb *inp)
379 {
380 int error;
381
382 INP_LOCK_ASSERT(inp);
383
384 MAC_POLICY_CHECK_NOSLEEP(inpcb_check_visible, cred, inp,
385 inp->inp_label);
386 MAC_CHECK_PROBE2(inpcb_check_visible, error, cred, inp);
387
388 return (error);
389 }
390
391 void
392 mac_inpcb_sosetlabel(struct socket *so, struct inpcb *inp)
393 {
394
395 INP_WLOCK_ASSERT(inp);
396 SOCK_LOCK_ASSERT(so);
397
398 MAC_POLICY_PERFORM_NOSLEEP(inpcb_sosetlabel, so, so->so_label, inp,
399 inp->inp_label);
400 }
401
402 void
403 mac_netinet_firewall_reply(struct mbuf *mrecv, struct mbuf *msend)
404 {
405 struct label *mrecvlabel, *msendlabel;
406
407 M_ASSERTPKTHDR(mrecv);
408 M_ASSERTPKTHDR(msend);
409
410 if (mac_policy_count == 0)
411 return;
412
413 mrecvlabel = mac_mbuf_to_label(mrecv);
414 msendlabel = mac_mbuf_to_label(msend);
415
416 MAC_POLICY_PERFORM_NOSLEEP(netinet_firewall_reply, mrecv, mrecvlabel,
417 msend, msendlabel);
418 }
419
420 void
421 mac_netinet_firewall_send(struct mbuf *m)
422 {
423 struct label *label;
424
425 M_ASSERTPKTHDR(m);
426
427 if (mac_policy_count == 0)
428 return;
429
430 label = mac_mbuf_to_label(m);
431
432 MAC_POLICY_PERFORM_NOSLEEP(netinet_firewall_send, m, label);
433 }
434
435 /*
436 * These functions really should be referencing the syncache structure
437 * instead of the label. However, due to some of the complexities associated
438 * with exposing this syncache structure we operate directly on it's label
439 * pointer. This should be OK since we aren't making any access control
440 * decisions within this code directly, we are merely allocating and copying
441 * label storage so we can properly initialize mbuf labels for any packets
442 * the syncache code might create.
443 */
444 void
445 mac_syncache_destroy(struct label **label)
446 {
447
448 if (*label != NULL) {
449 MAC_POLICY_PERFORM_NOSLEEP(syncache_destroy_label, *label);
450 mac_labelzone_free(*label);
451 *label = NULL;
452 }
453 }
454
455 int
456 mac_syncache_init(struct label **label)
457 {
458 int error;
459
460 if (mac_labeled & MPC_OBJECT_SYNCACHE) {
461 *label = mac_labelzone_alloc(M_NOWAIT);
462 if (*label == NULL)
463 return (ENOMEM);
464 /*
465 * Since we are holding the inpcb locks the policy can not
466 * allocate policy specific label storage using M_WAITOK. So
467 * we need to do a MAC_CHECK instead of the typical
468 * MAC_PERFORM so we can propagate allocation failures back
469 * to the syncache code.
470 */
471 MAC_POLICY_CHECK_NOSLEEP(syncache_init_label, *label,
472 M_NOWAIT);
473 if (error) {
474 MAC_POLICY_PERFORM_NOSLEEP(syncache_destroy_label,
475 *label);
476 mac_labelzone_free(*label);
477 }
478 return (error);
479 } else
480 *label = NULL;
481 return (0);
482 }
483
484 void
485 mac_syncache_create(struct label *label, struct inpcb *inp)
486 {
487
488 INP_WLOCK_ASSERT(inp);
489
490 MAC_POLICY_PERFORM_NOSLEEP(syncache_create, label, inp);
491 }
492
493 void
494 mac_syncache_create_mbuf(struct label *sc_label, struct mbuf *m)
495 {
496 struct label *mlabel;
497
498 M_ASSERTPKTHDR(m);
499
500 if (mac_policy_count == 0)
501 return;
502
503 mlabel = mac_mbuf_to_label(m);
504
505 MAC_POLICY_PERFORM_NOSLEEP(syncache_create_mbuf, sc_label, m,
506 mlabel);
507 }
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