mac_inet.c revision 126262 
1/*-
2 * Copyright (c) 1999-2002 Robert N. M. Watson
3 * Copyright (c) 2001 Ilmar S. Habibulin
4 * Copyright (c) 2001-2004 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 Network
11 * Associates Laboratories, the Security Research Division of Network
12 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
13 * as part of the DARPA 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 *
24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37#include <sys/cdefs.h>
38__FBSDID("$FreeBSD: head/sys/security/mac/mac_inet.c 126262 2004-02-26 03:51:04Z rwatson $");
39
40#include "opt_mac.h"
41
42#include <sys/param.h>
43#include <sys/kernel.h>
44#include <sys/lock.h>
45#include <sys/malloc.h>
46#include <sys/mutex.h>
47#include <sys/mac.h>
48#include <sys/sbuf.h>
49#include <sys/systm.h>
50#include <sys/mount.h>
51#include <sys/file.h>
52#include <sys/namei.h>
53#include <sys/protosw.h>
54#include <sys/socket.h>
55#include <sys/socketvar.h>
56#include <sys/sysctl.h>
57
58#include <sys/mac_policy.h>
59
60#include <net/if.h>
61#include <net/if_var.h>
62
63#include <netinet/in.h>
64#include <netinet/in_pcb.h>
65#include <netinet/ip_var.h>
66
67#include <security/mac/mac_internal.h>
68
69#ifdef MAC_DEBUG
70static unsigned int nmacinpcbs, nmacipqs;
71
72SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, inpcbs, CTLFLAG_RD,
73    &nmacinpcbs, 0, "number of inpcbs in use");
74SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, ipqs, CTLFLAG_RD,
75    &nmacipqs, 0, "number of ipqs in use");
76#endif
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	MAC_CHECK(init_inpcb_label, label, flag);
88	if (error) {
89		MAC_PERFORM(destroy_inpcb_label, label);
90		mac_labelzone_free(label);
91		return (NULL);
92	}
93	MAC_DEBUG_COUNTER_INC(&nmacinpcbs);
94	return (label);
95}
96
97int
98mac_init_inpcb(struct inpcb *inp, int flag)
99{
100
101	inp->inp_label = mac_inpcb_label_alloc(flag);
102	if (inp->inp_label == NULL)
103		return (ENOMEM);
104	return (0);
105}
106
107static struct label *
108mac_ipq_label_alloc(int flag)
109{
110	struct label *label;
111	int error;
112
113	label = mac_labelzone_alloc(flag);
114	if (label == NULL)
115		return (NULL);
116
117	MAC_CHECK(init_ipq_label, label, flag);
118	if (error) {
119		MAC_PERFORM(destroy_ipq_label, label);
120		mac_labelzone_free(label);
121		return (NULL);
122	}
123	MAC_DEBUG_COUNTER_INC(&nmacipqs);
124	return (label);
125}
126
127int
128mac_init_ipq(struct ipq *ipq, int flag)
129{
130
131	ipq->ipq_label = mac_ipq_label_alloc(flag);
132	if (ipq->ipq_label == NULL)
133		return (ENOMEM);
134	return (0);
135}
136
137static void
138mac_inpcb_label_free(struct label *label)
139{
140
141	MAC_PERFORM(destroy_inpcb_label, label);
142	mac_labelzone_free(label);
143	MAC_DEBUG_COUNTER_DEC(&nmacinpcbs);
144}
145
146void
147mac_destroy_inpcb(struct inpcb *inp)
148{
149
150	mac_inpcb_label_free(inp->inp_label);
151	inp->inp_label = NULL;
152}
153
154static void
155mac_ipq_label_free(struct label *label)
156{
157
158	MAC_PERFORM(destroy_ipq_label, label);
159	mac_labelzone_free(label);
160	MAC_DEBUG_COUNTER_DEC(&nmacipqs);
161}
162
163void
164mac_destroy_ipq(struct ipq *ipq)
165{
166
167	mac_ipq_label_free(ipq->ipq_label);
168	ipq->ipq_label = NULL;
169}
170
171void
172mac_create_inpcb_from_socket(struct socket *so, struct inpcb *inp)
173{
174
175	MAC_PERFORM(create_inpcb_from_socket, so, so->so_label, inp,
176	    inp->inp_label);
177}
178
179void
180mac_create_datagram_from_ipq(struct ipq *ipq, struct mbuf *datagram)
181{
182	struct label *label;
183
184	label = mac_mbuf_to_label(datagram);
185
186	MAC_PERFORM(create_datagram_from_ipq, ipq, ipq->ipq_label,
187	    datagram, label);
188}
189
190void
191mac_create_fragment(struct mbuf *datagram, struct mbuf *fragment)
192{
193	struct label *datagramlabel, *fragmentlabel;
194
195	datagramlabel = mac_mbuf_to_label(datagram);
196	fragmentlabel = mac_mbuf_to_label(fragment);
197
198	MAC_PERFORM(create_fragment, datagram, datagramlabel, fragment,
199	    fragmentlabel);
200}
201
202void
203mac_create_ipq(struct mbuf *fragment, struct ipq *ipq)
204{
205	struct label *label;
206
207	label = mac_mbuf_to_label(fragment);
208
209	MAC_PERFORM(create_ipq, fragment, label, ipq, ipq->ipq_label);
210}
211
212void
213mac_create_mbuf_from_inpcb(struct inpcb *inp, struct mbuf *m)
214{
215	struct label *mlabel;
216
217	INP_LOCK_ASSERT(inp);
218	mlabel = mac_mbuf_to_label(m);
219
220	MAC_PERFORM(create_mbuf_from_inpcb, inp, inp->inp_label, m, mlabel);
221}
222
223int
224mac_fragment_match(struct mbuf *fragment, struct ipq *ipq)
225{
226	struct label *label;
227	int result;
228
229	label = mac_mbuf_to_label(fragment);
230
231	result = 1;
232	MAC_BOOLEAN(fragment_match, &&, fragment, label, ipq,
233	    ipq->ipq_label);
234
235	return (result);
236}
237
238void
239mac_reflect_mbuf_icmp(struct mbuf *m)
240{
241	struct label *label;
242
243	label = mac_mbuf_to_label(m);
244
245	MAC_PERFORM(reflect_mbuf_icmp, m, label);
246}
247void
248mac_reflect_mbuf_tcp(struct mbuf *m)
249{
250	struct label *label;
251
252	label = mac_mbuf_to_label(m);
253
254	MAC_PERFORM(reflect_mbuf_tcp, m, label);
255}
256
257void
258mac_update_ipq(struct mbuf *fragment, struct ipq *ipq)
259{
260	struct label *label;
261
262	label = mac_mbuf_to_label(fragment);
263
264	MAC_PERFORM(update_ipq, fragment, label, ipq, ipq->ipq_label);
265}
266
267int
268mac_check_inpcb_deliver(struct inpcb *inp, struct mbuf *m)
269{
270	struct label *label;
271	int error;
272
273	M_ASSERTPKTHDR(m);
274
275	if (!mac_enforce_socket)
276		return (0);
277
278	label = mac_mbuf_to_label(m);
279
280	MAC_CHECK(check_inpcb_deliver, inp, inp->inp_label, m, label);
281
282	return (error);
283}
284
285void
286mac_inpcb_sosetlabel(struct socket *so, struct inpcb *inp)
287{
288
289	/* XXX: assert socket lock. */
290	INP_LOCK_ASSERT(inp);
291	MAC_PERFORM(inpcb_sosetlabel, so, so->so_label, inp, inp->inp_label);
292}
293