mac_sysv_msg.c revision 142383 
1/*-
2 * Copyright (c) 2003-2004 Networks Associates Technology, Inc.
3 * All rights reserved.
4 *
5 * This software was developed for the FreeBSD Project in part by Network
6 * Associates Laboratories, the Security Research Division of Network
7 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
8 * as part of the DARPA CHATS research program.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33__FBSDID("$FreeBSD: head/sys/security/mac/mac_sysv_msg.c 142383 2005-02-24 16:08:41Z rwatson $");
34
35#include "opt_mac.h"
36
37#include <sys/param.h>
38#include <sys/kernel.h>
39#include <sys/lock.h>
40#include <sys/malloc.h>
41#include <sys/mutex.h>
42#include <sys/mac.h>
43#include <sys/sbuf.h>
44#include <sys/systm.h>
45#include <sys/vnode.h>
46#include <sys/mount.h>
47#include <sys/file.h>
48#include <sys/namei.h>
49#include <sys/sysctl.h>
50#include <sys/msg.h>
51
52#include <sys/mac_policy.h>
53
54#include <security/mac/mac_internal.h>
55
56static int	mac_enforce_sysv_msg = 1;
57SYSCTL_INT(_security_mac, OID_AUTO, enforce_sysv_msg, CTLFLAG_RW,
58    &mac_enforce_sysv_msg, 0,
59    "Enforce MAC policy on System V IPC Message Queues");
60TUNABLE_INT("security.mac.enforce_sysv_msg", &mac_enforce_sysv_msg);
61
62#ifdef MAC_DEBUG
63static unsigned int nmacipcmsgs, nmacipcmsqs;
64SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, ipc_msgs, CTLFLAG_RD,
65    &nmacipcmsgs, 0, "number of sysv ipc messages inuse");
66SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, ipc_msqs, CTLFLAG_RD,
67    &nmacipcmsqs, 0, "number of sysv ipc message queue identifiers inuse");
68#endif
69
70static struct label *
71mac_sysv_msgmsg_label_alloc(void)
72{
73	struct label *label;
74
75	label = mac_labelzone_alloc(M_WAITOK);
76	MAC_PERFORM(init_sysv_msgmsg_label, label);
77	MAC_DEBUG_COUNTER_INC(&nmacipcmsgs);
78	return (label);
79}
80
81void
82mac_init_sysv_msgmsg(struct msg *msgptr)
83{
84
85	msgptr->label = mac_sysv_msgmsg_label_alloc();
86}
87
88static struct label *
89mac_sysv_msgqueue_label_alloc(void)
90{
91	struct label *label;
92
93	label = mac_labelzone_alloc(M_WAITOK);
94	MAC_PERFORM(init_sysv_msgqueue_label, label);
95	MAC_DEBUG_COUNTER_INC(&nmacipcmsqs);
96	return (label);
97}
98
99void
100mac_init_sysv_msgqueue(struct msqid_kernel *msqkptr)
101{
102
103	msqkptr->label = mac_sysv_msgqueue_label_alloc();
104}
105
106static void
107mac_sysv_msgmsg_label_free(struct label *label)
108{
109
110	MAC_PERFORM(destroy_sysv_msgmsg_label, label);
111	mac_labelzone_free(label);
112	MAC_DEBUG_COUNTER_DEC(&nmacipcmsgs);
113}
114
115void
116mac_destroy_sysv_msgmsg(struct msg *msgptr)
117{
118
119	mac_sysv_msgmsg_label_free(msgptr->label);
120	msgptr->label = NULL;
121}
122
123static void
124mac_sysv_msgqueue_label_free(struct label *label)
125{
126
127	MAC_PERFORM(destroy_sysv_msgqueue_label, label);
128	mac_labelzone_free(label);
129	MAC_DEBUG_COUNTER_DEC(&nmacipcmsqs);
130}
131
132void
133mac_destroy_sysv_msgqueue(struct msqid_kernel *msqkptr)
134{
135
136	mac_sysv_msgqueue_label_free(msqkptr->label);
137	msqkptr->label = NULL;
138}
139
140void
141mac_create_sysv_msgmsg(struct ucred *cred, struct msqid_kernel *msqkptr,
142    struct msg *msgptr)
143{
144
145	MAC_PERFORM(create_sysv_msgmsg, cred, msqkptr, msqkptr->label,
146		msgptr, msgptr->label);
147}
148
149void
150mac_create_sysv_msgqueue(struct ucred *cred, struct msqid_kernel *msqkptr)
151{
152
153	MAC_PERFORM(create_sysv_msgqueue, cred, msqkptr, msqkptr->label);
154}
155
156void
157mac_cleanup_sysv_msgmsg(struct msg *msgptr)
158{
159
160	MAC_PERFORM(cleanup_sysv_msgmsg, msgptr->label);
161}
162
163void
164mac_cleanup_sysv_msgqueue(struct msqid_kernel *msqkptr)
165{
166
167	MAC_PERFORM(cleanup_sysv_msgqueue, msqkptr->label);
168}
169
170int
171mac_check_sysv_msgmsq(struct ucred *cred, struct msg *msgptr,
172	struct msqid_kernel *msqkptr)
173{
174	int error;
175
176	if (!mac_enforce_sysv_msg)
177		return (0);
178
179	MAC_CHECK(check_sysv_msgmsq, cred,  msgptr, msgptr->label, msqkptr,
180	    msqkptr->label);
181
182	return(error);
183}
184
185int
186mac_check_sysv_msgrcv(struct ucred *cred, struct msg *msgptr)
187{
188	int error;
189
190	if (!mac_enforce_sysv_msg)
191		return (0);
192
193	MAC_CHECK(check_sysv_msgrcv, cred, msgptr, msgptr->label);
194
195	return(error);
196}
197
198int
199mac_check_sysv_msgrmid(struct ucred *cred, struct msg *msgptr)
200{
201	int error;
202
203	if (!mac_enforce_sysv_msg)
204		return (0);
205
206	MAC_CHECK(check_sysv_msgrmid, cred,  msgptr, msgptr->label);
207
208	return(error);
209}
210
211int
212mac_check_sysv_msqget(struct ucred *cred, struct msqid_kernel *msqkptr)
213{
214	int error;
215
216	if (!mac_enforce_sysv_msg)
217		return (0);
218
219	MAC_CHECK(check_sysv_msqget, cred, msqkptr, msqkptr->label);
220
221	return(error);
222}
223
224int
225mac_check_sysv_msqsnd(struct ucred *cred, struct msqid_kernel *msqkptr)
226{
227	int error;
228
229	if (!mac_enforce_sysv_msg)
230		return (0);
231
232	MAC_CHECK(check_sysv_msqsnd, cred, msqkptr, msqkptr->label);
233
234	return(error);
235}
236
237int
238mac_check_sysv_msqrcv(struct ucred *cred, struct msqid_kernel *msqkptr)
239{
240	int error;
241
242	if (!mac_enforce_sysv_msg)
243		return (0);
244
245	MAC_CHECK(check_sysv_msqrcv, cred, msqkptr, msqkptr->label);
246
247	return(error);
248}
249
250int
251mac_check_sysv_msqctl(struct ucred *cred, struct msqid_kernel *msqkptr,
252    int cmd)
253{
254	int error;
255
256	if (!mac_enforce_sysv_msg)
257		return (0);
258
259	MAC_CHECK(check_sysv_msqctl, cred, msqkptr, msqkptr->label, cmd);
260
261	return(error);
262}
263