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("$FreeBSD$");
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
56 static int mac_enforce_sysv_msg = 1;
57 SYSCTL_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");
60 TUNABLE_INT("security.mac.enforce_sysv_msg", &mac_enforce_sysv_msg);
61
62 #ifdef MAC_DEBUG
63 static unsigned int nmacipcmsgs, nmacipcmsqs;
64 SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, ipc_msgs, CTLFLAG_RD,
65 &nmacipcmsgs, 0, "number of sysv ipc messages inuse");
66 SYSCTL_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
70 static struct label *
71 mac_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
81 void
82 mac_init_sysv_msgmsg(struct msg *msgptr)
83 {
84
85 msgptr->label = mac_sysv_msgmsg_label_alloc();
86 }
87
88 static struct label *
89 mac_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
99 void
100 mac_init_sysv_msgqueue(struct msqid_kernel *msqkptr)
101 {
102
103 msqkptr->label = mac_sysv_msgqueue_label_alloc();
104 }
105
106 static void
107 mac_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
115 void
116 mac_destroy_sysv_msgmsg(struct msg *msgptr)
117 {
118
119 mac_sysv_msgmsg_label_free(msgptr->label);
120 msgptr->label = NULL;
121 }
122
123 static void
124 mac_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
132 void
133 mac_destroy_sysv_msgqueue(struct msqid_kernel *msqkptr)
134 {
135
136 mac_sysv_msgqueue_label_free(msqkptr->label);
137 msqkptr->label = NULL;
138 }
139
140 void
141 mac_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
149 void
150 mac_create_sysv_msgqueue(struct ucred *cred, struct msqid_kernel *msqkptr)
151 {
152
153 MAC_PERFORM(create_sysv_msgqueue, cred, msqkptr, msqkptr->label);
154 }
155
156 void
157 mac_cleanup_sysv_msgmsg(struct msg *msgptr)
158 {
159
160 MAC_PERFORM(cleanup_sysv_msgmsg, msgptr->label);
161 }
162
163 void
164 mac_cleanup_sysv_msgqueue(struct msqid_kernel *msqkptr)
165 {
166
167 MAC_PERFORM(cleanup_sysv_msgqueue, msqkptr->label);
168 }
169
170 int
171 mac_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
185 int
186 mac_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
198 int
199 mac_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
211 int
212 mac_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
224 int
225 mac_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
237 int
238 mac_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
250 int
251 mac_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 }
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