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("$FreeBSD$");
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
78static struct label *
79mac_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
99int
100mac_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
112static struct label *
113mac_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
134int
135mac_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
147static void
148mac_inpcb_label_free(struct label *label)
149{
150
151	MAC_POLICY_PERFORM_NOSLEEP(inpcb_destroy_label, label);
152	mac_labelzone_free(label);
153}
154
155void
156mac_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
165static void
166mac_ipq_label_free(struct label *label)
167{
168
169	MAC_POLICY_PERFORM_NOSLEEP(ipq_destroy_label, label);
170	mac_labelzone_free(label);
171}
172
173void
174mac_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
183void
184mac_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
191void
192mac_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
205void
206mac_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
220void
221mac_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
233void
234mac_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
249int
250mac_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
266void
267mac_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
282void
283mac_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
297void
298mac_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
310void
311mac_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
326void
327mac_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
339void
340mac_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
352MAC_CHECK_PROBE_DEFINE2(inpcb_check_deliver, "struct inpcb *",
353    "struct mbuf *");
354
355int
356mac_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
375MAC_CHECK_PROBE_DEFINE2(inpcb_check_visible, "struct ucred *",
376    "struct inpcb *");
377
378int
379mac_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
392void
393mac_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
403void
404mac_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
421void
422mac_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 */
445void
446mac_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
456int
457mac_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
485void
486mac_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
494void
495mac_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}
509