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/10.0/sys/security/mac/mac_inet.c 193391 2009-06-03 18:46:28Z rwatson $");
47
48 #include "opt_kdtrace.h"
49 #include "opt_mac.h"
50
51 #include <sys/param.h>
52 #include <sys/kernel.h>
53 #include <sys/lock.h>
54 #include <sys/malloc.h>
55 #include <sys/mutex.h>
56 #include <sys/sbuf.h>
57 #include <sys/sdt.h>
58 #include <sys/systm.h>
59 #include <sys/mount.h>
60 #include <sys/file.h>
61 #include <sys/namei.h>
62 #include <sys/protosw.h>
63 #include <sys/socket.h>
64 #include <sys/socketvar.h>
65 #include <sys/sysctl.h>
66
67 #include <net/if.h>
68 #include <net/if_var.h>
69
70 #include <netinet/in.h>
71 #include <netinet/in_pcb.h>
72 #include <netinet/ip_var.h>
73
74 #include <security/mac/mac_framework.h>
75 #include <security/mac/mac_internal.h>
76 #include <security/mac/mac_policy.h>
77
78 static struct label *
79 mac_inpcb_label_alloc(int flag)
80 {
81 struct label *label;
82 int error;
83
84 label = mac_labelzone_alloc(flag);
85 if (label == NULL)
86 return (NULL);
87 if (flag & M_WAITOK)
88 MAC_POLICY_CHECK(inpcb_init_label, label, flag);
89 else
90 MAC_POLICY_CHECK_NOSLEEP(inpcb_init_label, label, flag);
91 if (error) {
92 MAC_POLICY_PERFORM_NOSLEEP(inpcb_destroy_label, label);
93 mac_labelzone_free(label);
94 return (NULL);
95 }
96 return (label);
97 }
98
99 int
100 mac_inpcb_init(struct inpcb *inp, int flag)
101 {
102
103 if (mac_labeled & MPC_OBJECT_INPCB) {
104 inp->inp_label = mac_inpcb_label_alloc(flag);
105 if (inp->inp_label == NULL)
106 return (ENOMEM);
107 } else
108 inp->inp_label = NULL;
109 return (0);
110 }
111
112 static struct label *
113 mac_ipq_label_alloc(int flag)
114 {
115 struct label *label;
116 int error;
117
118 label = mac_labelzone_alloc(flag);
119 if (label == NULL)
120 return (NULL);
121
122 if (flag & M_WAITOK)
123 MAC_POLICY_CHECK(ipq_init_label, label, flag);
124 else
125 MAC_POLICY_CHECK_NOSLEEP(ipq_init_label, label, flag);
126 if (error) {
127 MAC_POLICY_PERFORM_NOSLEEP(ipq_destroy_label, label);
128 mac_labelzone_free(label);
129 return (NULL);
130 }
131 return (label);
132 }
133
134 int
135 mac_ipq_init(struct ipq *q, int flag)
136 {
137
138 if (mac_labeled & MPC_OBJECT_IPQ) {
139 q->ipq_label = mac_ipq_label_alloc(flag);
140 if (q->ipq_label == NULL)
141 return (ENOMEM);
142 } else
143 q->ipq_label = NULL;
144 return (0);
145 }
146
147 static void
148 mac_inpcb_label_free(struct label *label)
149 {
150
151 MAC_POLICY_PERFORM_NOSLEEP(inpcb_destroy_label, label);
152 mac_labelzone_free(label);
153 }
154
155 void
156 mac_inpcb_destroy(struct inpcb *inp)
157 {
158
159 if (inp->inp_label != NULL) {
160 mac_inpcb_label_free(inp->inp_label);
161 inp->inp_label = NULL;
162 }
163 }
164
165 static void
166 mac_ipq_label_free(struct label *label)
167 {
168
169 MAC_POLICY_PERFORM_NOSLEEP(ipq_destroy_label, label);
170 mac_labelzone_free(label);
171 }
172
173 void
174 mac_ipq_destroy(struct ipq *q)
175 {
176
177 if (q->ipq_label != NULL) {
178 mac_ipq_label_free(q->ipq_label);
179 q->ipq_label = NULL;
180 }
181 }
182
183 void
184 mac_inpcb_create(struct socket *so, struct inpcb *inp)
185 {
186
187 MAC_POLICY_PERFORM_NOSLEEP(inpcb_create, so, so->so_label, inp,
188 inp->inp_label);
189 }
190
191 void
192 mac_ipq_reassemble(struct ipq *q, struct mbuf *m)
193 {
194 struct label *label;
195
196 if (mac_policy_count == 0)
197 return;
198
199 label = mac_mbuf_to_label(m);
200
201 MAC_POLICY_PERFORM_NOSLEEP(ipq_reassemble, q, q->ipq_label, m,
202 label);
203 }
204
205 void
206 mac_netinet_fragment(struct mbuf *m, struct mbuf *frag)
207 {
208 struct label *mlabel, *fraglabel;
209
210 if (mac_policy_count == 0)
211 return;
212
213 mlabel = mac_mbuf_to_label(m);
214 fraglabel = mac_mbuf_to_label(frag);
215
216 MAC_POLICY_PERFORM_NOSLEEP(netinet_fragment, m, mlabel, frag,
217 fraglabel);
218 }
219
220 void
221 mac_ipq_create(struct mbuf *m, struct ipq *q)
222 {
223 struct label *label;
224
225 if (mac_policy_count == 0)
226 return;
227
228 label = mac_mbuf_to_label(m);
229
230 MAC_POLICY_PERFORM_NOSLEEP(ipq_create, m, label, q, q->ipq_label);
231 }
232
233 void
234 mac_inpcb_create_mbuf(struct inpcb *inp, struct mbuf *m)
235 {
236 struct label *mlabel;
237
238 INP_LOCK_ASSERT(inp);
239
240 if (mac_policy_count == 0)
241 return;
242
243 mlabel = mac_mbuf_to_label(m);
244
245 MAC_POLICY_PERFORM_NOSLEEP(inpcb_create_mbuf, inp, inp->inp_label, m,
246 mlabel);
247 }
248
249 int
250 mac_ipq_match(struct mbuf *m, struct ipq *q)
251 {
252 struct label *label;
253 int result;
254
255 if (mac_policy_count == 0)
256 return (1);
257
258 label = mac_mbuf_to_label(m);
259
260 result = 1;
261 MAC_POLICY_BOOLEAN_NOSLEEP(ipq_match, &&, m, label, q, q->ipq_label);
262
263 return (result);
264 }
265
266 void
267 mac_netinet_arp_send(struct ifnet *ifp, struct mbuf *m)
268 {
269 struct label *mlabel;
270
271 if (mac_policy_count == 0)
272 return;
273
274 mlabel = mac_mbuf_to_label(m);
275
276 MAC_IFNET_LOCK(ifp);
277 MAC_POLICY_PERFORM_NOSLEEP(netinet_arp_send, ifp, ifp->if_label, m,
278 mlabel);
279 MAC_IFNET_UNLOCK(ifp);
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
315 if (mac_policy_count == 0)
316 return;
317
318 mlabel = mac_mbuf_to_label(m);
319
320 MAC_IFNET_LOCK(ifp);
321 MAC_POLICY_PERFORM_NOSLEEP(netinet_igmp_send, ifp, ifp->if_label, m,
322 mlabel);
323 MAC_IFNET_UNLOCK(ifp);
324 }
325
326 void
327 mac_netinet_tcp_reply(struct mbuf *m)
328 {
329 struct label *label;
330
331 if (mac_policy_count == 0)
332 return;
333
334 label = mac_mbuf_to_label(m);
335
336 MAC_POLICY_PERFORM_NOSLEEP(netinet_tcp_reply, m, label);
337 }
338
339 void
340 mac_ipq_update(struct mbuf *m, struct ipq *q)
341 {
342 struct label *label;
343
344 if (mac_policy_count == 0)
345 return;
346
347 label = mac_mbuf_to_label(m);
348
349 MAC_POLICY_PERFORM_NOSLEEP(ipq_update, m, label, q, q->ipq_label);
350 }
351
352 MAC_CHECK_PROBE_DEFINE2(inpcb_check_deliver, "struct inpcb *",
353 "struct mbuf *");
354
355 int
356 mac_inpcb_check_deliver(struct inpcb *inp, struct mbuf *m)
357 {
358 struct label *label;
359 int error;
360
361 M_ASSERTPKTHDR(m);
362
363 if (mac_policy_count == 0)
364 return (0);
365
366 label = mac_mbuf_to_label(m);
367
368 MAC_POLICY_CHECK_NOSLEEP(inpcb_check_deliver, inp, inp->inp_label, m,
369 label);
370 MAC_CHECK_PROBE2(inpcb_check_deliver, error, inp, m);
371
372 return (error);
373 }
374
375 MAC_CHECK_PROBE_DEFINE2(inpcb_check_visible, "struct ucred *",
376 "struct inpcb *");
377
378 int
379 mac_inpcb_check_visible(struct ucred *cred, struct inpcb *inp)
380 {
381 int error;
382
383 INP_LOCK_ASSERT(inp);
384
385 MAC_POLICY_CHECK_NOSLEEP(inpcb_check_visible, cred, inp,
386 inp->inp_label);
387 MAC_CHECK_PROBE2(inpcb_check_visible, error, cred, inp);
388
389 return (error);
390 }
391
392 void
393 mac_inpcb_sosetlabel(struct socket *so, struct inpcb *inp)
394 {
395
396 INP_WLOCK_ASSERT(inp);
397 SOCK_LOCK_ASSERT(so);
398
399 MAC_POLICY_PERFORM_NOSLEEP(inpcb_sosetlabel, so, so->so_label, inp,
400 inp->inp_label);
401 }
402
403 void
404 mac_netinet_firewall_reply(struct mbuf *mrecv, struct mbuf *msend)
405 {
406 struct label *mrecvlabel, *msendlabel;
407
408 M_ASSERTPKTHDR(mrecv);
409 M_ASSERTPKTHDR(msend);
410
411 if (mac_policy_count == 0)
412 return;
413
414 mrecvlabel = mac_mbuf_to_label(mrecv);
415 msendlabel = mac_mbuf_to_label(msend);
416
417 MAC_POLICY_PERFORM_NOSLEEP(netinet_firewall_reply, mrecv, mrecvlabel,
418 msend, msendlabel);
419 }
420
421 void
422 mac_netinet_firewall_send(struct mbuf *m)
423 {
424 struct label *label;
425
426 M_ASSERTPKTHDR(m);
427
428 if (mac_policy_count == 0)
429 return;
430
431 label = mac_mbuf_to_label(m);
432
433 MAC_POLICY_PERFORM_NOSLEEP(netinet_firewall_send, m, label);
434 }
435
436 /*
437 * These functions really should be referencing the syncache structure
438 * instead of the label. However, due to some of the complexities associated
439 * with exposing this syncache structure we operate directly on it's label
440 * pointer. This should be OK since we aren't making any access control
441 * decisions within this code directly, we are merely allocating and copying
442 * label storage so we can properly initialize mbuf labels for any packets
443 * the syncache code might create.
444 */
445 void
446 mac_syncache_destroy(struct label **label)
447 {
448
449 if (*label != NULL) {
450 MAC_POLICY_PERFORM_NOSLEEP(syncache_destroy_label, *label);
451 mac_labelzone_free(*label);
452 *label = NULL;
453 }
454 }
455
456 int
457 mac_syncache_init(struct label **label)
458 {
459 int error;
460
461 if (mac_labeled & MPC_OBJECT_SYNCACHE) {
462 *label = mac_labelzone_alloc(M_NOWAIT);
463 if (*label == NULL)
464 return (ENOMEM);
465 /*
466 * Since we are holding the inpcb locks the policy can not
467 * allocate policy specific label storage using M_WAITOK. So
468 * we need to do a MAC_CHECK instead of the typical
469 * MAC_PERFORM so we can propagate allocation failures back
470 * to the syncache code.
471 */
472 MAC_POLICY_CHECK_NOSLEEP(syncache_init_label, *label,
473 M_NOWAIT);
474 if (error) {
475 MAC_POLICY_PERFORM_NOSLEEP(syncache_destroy_label,
476 *label);
477 mac_labelzone_free(*label);
478 }
479 return (error);
480 } else
481 *label = NULL;
482 return (0);
483 }
484
485 void
486 mac_syncache_create(struct label *label, struct inpcb *inp)
487 {
488
489 INP_WLOCK_ASSERT(inp);
490
491 MAC_POLICY_PERFORM_NOSLEEP(syncache_create, label, inp);
492 }
493
494 void
495 mac_syncache_create_mbuf(struct label *sc_label, struct mbuf *m)
496 {
497 struct label *mlabel;
498
499 M_ASSERTPKTHDR(m);
500
501 if (mac_policy_count == 0)
502 return;
503
504 mlabel = mac_mbuf_to_label(m);
505
506 MAC_POLICY_PERFORM_NOSLEEP(syncache_create_mbuf, sc_label, m,
507 mlabel);
508 }
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