1/*-
2 * Copyright (c) 2003-2004 Networks Associates Technology, Inc.
3 * Copyright (c) 2006 SPARTA, Inc.
4 * Copyright (c) 2008 Apple Inc.
5 * Copyright (c) 2009 Robert N. M. Watson
6 * All rights reserved.
7 *
8 * This software was developed for the FreeBSD Project in part by Network
9 * Associates Laboratories, the Security Research Division of Network
10 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
11 * as part of the DARPA CHATS research program.
12 *
13 * This software was enhanced by SPARTA ISSO under SPAWAR contract
14 * N66001-04-C-6019 ("SEFOS").
15 *
16 * This software was developed at the University of Cambridge Computer
17 * Laboratory with support from a grant from Google, Inc.
18 *
19 * Redistribution and use in source and binary forms, with or without
20 * modification, are permitted provided that the following conditions
21 * are met:
22 * 1. Redistributions of source code must retain the above copyright
23 *    notice, this list of conditions and the following disclaimer.
24 * 2. Redistributions in binary form must reproduce the above copyright
25 *    notice, this list of conditions and the following disclaimer in the
26 *    documentation and/or other materials provided with the distribution.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * SUCH DAMAGE.
39 */
40
41#include <sys/cdefs.h>
42__FBSDID("$FreeBSD: releng/11.0/sys/security/mac/mac_sysv_msg.c 258541 2013-11-25 07:38:45Z attilio $");
43
44#include "opt_mac.h"
45
46#include <sys/param.h>
47#include <sys/kernel.h>
48#include <sys/lock.h>
49#include <sys/malloc.h>
50#include <sys/mutex.h>
51#include <sys/sbuf.h>
52#include <sys/sdt.h>
53#include <sys/systm.h>
54#include <sys/vnode.h>
55#include <sys/mount.h>
56#include <sys/file.h>
57#include <sys/namei.h>
58#include <sys/sysctl.h>
59#include <sys/msg.h>
60
61#include <security/mac/mac_framework.h>
62#include <security/mac/mac_internal.h>
63#include <security/mac/mac_policy.h>
64
65static struct label *
66mac_sysv_msgmsg_label_alloc(void)
67{
68	struct label *label;
69
70	label = mac_labelzone_alloc(M_WAITOK);
71	MAC_POLICY_PERFORM(sysvmsg_init_label, label);
72	return (label);
73}
74
75void
76mac_sysvmsg_init(struct msg *msgptr)
77{
78
79	if (mac_labeled & MPC_OBJECT_SYSVMSG)
80		msgptr->label = mac_sysv_msgmsg_label_alloc();
81	else
82		msgptr->label = NULL;
83}
84
85static struct label *
86mac_sysv_msgqueue_label_alloc(void)
87{
88	struct label *label;
89
90	label = mac_labelzone_alloc(M_WAITOK);
91	MAC_POLICY_PERFORM(sysvmsq_init_label, label);
92	return (label);
93}
94
95void
96mac_sysvmsq_init(struct msqid_kernel *msqkptr)
97{
98
99	if (mac_labeled & MPC_OBJECT_SYSVMSQ)
100		msqkptr->label = mac_sysv_msgqueue_label_alloc();
101	else
102		msqkptr->label = NULL;
103}
104
105static void
106mac_sysv_msgmsg_label_free(struct label *label)
107{
108
109	MAC_POLICY_PERFORM_NOSLEEP(sysvmsg_destroy_label, label);
110	mac_labelzone_free(label);
111}
112
113void
114mac_sysvmsg_destroy(struct msg *msgptr)
115{
116
117	if (msgptr->label != NULL) {
118		mac_sysv_msgmsg_label_free(msgptr->label);
119		msgptr->label = NULL;
120	}
121}
122
123static void
124mac_sysv_msgqueue_label_free(struct label *label)
125{
126
127	MAC_POLICY_PERFORM_NOSLEEP(sysvmsq_destroy_label, label);
128	mac_labelzone_free(label);
129}
130
131void
132mac_sysvmsq_destroy(struct msqid_kernel *msqkptr)
133{
134
135	if (msqkptr->label != NULL) {
136		mac_sysv_msgqueue_label_free(msqkptr->label);
137		msqkptr->label = NULL;
138	}
139}
140
141void
142mac_sysvmsg_create(struct ucred *cred, struct msqid_kernel *msqkptr,
143    struct msg *msgptr)
144{
145
146	MAC_POLICY_PERFORM_NOSLEEP(sysvmsg_create, cred, msqkptr,
147	    msqkptr->label, msgptr, msgptr->label);
148}
149
150void
151mac_sysvmsq_create(struct ucred *cred, struct msqid_kernel *msqkptr)
152{
153
154	MAC_POLICY_PERFORM_NOSLEEP(sysvmsq_create, cred, msqkptr,
155	    msqkptr->label);
156}
157
158void
159mac_sysvmsg_cleanup(struct msg *msgptr)
160{
161
162	MAC_POLICY_PERFORM_NOSLEEP(sysvmsg_cleanup, msgptr->label);
163}
164
165void
166mac_sysvmsq_cleanup(struct msqid_kernel *msqkptr)
167{
168
169	MAC_POLICY_PERFORM_NOSLEEP(sysvmsq_cleanup, msqkptr->label);
170}
171
172MAC_CHECK_PROBE_DEFINE3(sysvmsq_check_msgmsq, "struct ucred *",
173    "struct msg *", "struct msqid_kernel *");
174
175int
176mac_sysvmsq_check_msgmsq(struct ucred *cred, struct msg *msgptr,
177	struct msqid_kernel *msqkptr)
178{
179	int error;
180
181	MAC_POLICY_CHECK_NOSLEEP(sysvmsq_check_msgmsq, cred, msgptr,
182	    msgptr->label, msqkptr, msqkptr->label);
183	MAC_CHECK_PROBE3(sysvmsq_check_msgmsq, error, cred, msgptr, msqkptr);
184
185	return (error);
186}
187
188MAC_CHECK_PROBE_DEFINE2(sysvmsq_check_msgrcv, "struct ucred *",
189    "struct msg *");
190
191int
192mac_sysvmsq_check_msgrcv(struct ucred *cred, struct msg *msgptr)
193{
194	int error;
195
196	MAC_POLICY_CHECK_NOSLEEP(sysvmsq_check_msgrcv, cred, msgptr,
197	    msgptr->label);
198	MAC_CHECK_PROBE2(sysvmsq_check_msgrcv, error, cred, msgptr);
199
200	return (error);
201}
202
203MAC_CHECK_PROBE_DEFINE2(sysvmsq_check_msgrmid, "struct ucred *",
204    "struct msg *");
205
206int
207mac_sysvmsq_check_msgrmid(struct ucred *cred, struct msg *msgptr)
208{
209	int error;
210
211	MAC_POLICY_CHECK_NOSLEEP(sysvmsq_check_msgrmid, cred, msgptr,
212	    msgptr->label);
213	MAC_CHECK_PROBE2(sysvmsq_check_msgrmid, error, cred, msgptr);
214
215	return (error);
216}
217
218MAC_CHECK_PROBE_DEFINE2(sysvmsq_check_msqget, "struct ucred *",
219    "struct msqid_kernel *");
220
221int
222mac_sysvmsq_check_msqget(struct ucred *cred, struct msqid_kernel *msqkptr)
223{
224	int error;
225
226	MAC_POLICY_CHECK_NOSLEEP(sysvmsq_check_msqget, cred, msqkptr,
227	    msqkptr->label);
228	MAC_CHECK_PROBE2(sysvmsq_check_msqget, error, cred, msqkptr);
229
230	return (error);
231}
232
233MAC_CHECK_PROBE_DEFINE2(sysvmsq_check_msqsnd, "struct ucred *",
234    "struct msqid_kernel *");
235
236int
237mac_sysvmsq_check_msqsnd(struct ucred *cred, struct msqid_kernel *msqkptr)
238{
239	int error;
240
241	MAC_POLICY_CHECK_NOSLEEP(sysvmsq_check_msqsnd, cred, msqkptr,
242	    msqkptr->label);
243	MAC_CHECK_PROBE2(sysvmsq_check_msqsnd, error, cred, msqkptr);
244
245	return (error);
246}
247
248MAC_CHECK_PROBE_DEFINE2(sysvmsq_check_msqrcv, "struct ucred *",
249    "struct msqid_kernel *");
250
251int
252mac_sysvmsq_check_msqrcv(struct ucred *cred, struct msqid_kernel *msqkptr)
253{
254	int error;
255
256	MAC_POLICY_CHECK_NOSLEEP(sysvmsq_check_msqrcv, cred, msqkptr,
257	    msqkptr->label);
258	MAC_CHECK_PROBE2(sysvmsq_check_msqrcv, error, cred, msqkptr);
259
260	return (error);
261}
262
263MAC_CHECK_PROBE_DEFINE3(sysvmsq_check_msqctl, "struct ucred *",
264    "struct msqid_kernel *", "int");
265
266int
267mac_sysvmsq_check_msqctl(struct ucred *cred, struct msqid_kernel *msqkptr,
268    int cmd)
269{
270	int error;
271
272	MAC_POLICY_CHECK_NOSLEEP(sysvmsq_check_msqctl, cred, msqkptr,
273	    msqkptr->label, cmd);
274	MAC_CHECK_PROBE3(sysvmsq_check_msqctl, error, cred, msqkptr, cmd);
275
276	return (error);
277}
278