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/shm.h>
51
52 #include <sys/mac_policy.h>
53
54 #include <security/mac/mac_internal.h>
55
56 static int mac_enforce_sysv_shm = 1;
57 SYSCTL_INT(_security_mac, OID_AUTO, enforce_sysv_shm, CTLFLAG_RW,
58 &mac_enforce_sysv_shm, 0,
59 "Enforce MAC policy on System V IPC shared memory");
60 TUNABLE_INT("security.mac.enforce_sysv", &mac_enforce_sysv_shm);
61
62 #ifdef MAC_DEBUG
63 static unsigned int nmacipcshms;
64 SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, ipc_shms, CTLFLAG_RD,
65 &nmacipcshms, 0, "number of sysv ipc shm identifiers inuse");
66 #endif
67
68 static struct label *
69 mac_sysv_shm_label_alloc(void)
70 {
71 struct label *label;
72
73 label = mac_labelzone_alloc(M_WAITOK);
74 MAC_PERFORM(init_sysv_shm_label, label);
75 MAC_DEBUG_COUNTER_INC(&nmacipcshms);
76 return (label);
77 }
78
79 void
80 mac_init_sysv_shm(struct shmid_kernel *shmsegptr)
81 {
82
83 shmsegptr->label = mac_sysv_shm_label_alloc();
84 }
85
86 static void
87 mac_sysv_shm_label_free(struct label *label)
88 {
89
90 MAC_PERFORM(destroy_sysv_shm_label, label);
91 mac_labelzone_free(label);
92 MAC_DEBUG_COUNTER_DEC(&nmacipcshms);
93 }
94
95 void
96 mac_destroy_sysv_shm(struct shmid_kernel *shmsegptr)
97 {
98
99 mac_sysv_shm_label_free(shmsegptr->label);
100 shmsegptr->label = NULL;
101 }
102
103 void
104 mac_create_sysv_shm(struct ucred *cred, struct shmid_kernel *shmsegptr)
105 {
106
107 MAC_PERFORM(create_sysv_shm, cred, shmsegptr, shmsegptr->label);
108 }
109
110 void
111 mac_cleanup_sysv_shm(struct shmid_kernel *shmsegptr)
112 {
113
114 MAC_PERFORM(cleanup_sysv_shm, shmsegptr->label);
115 }
116
117 int
118 mac_check_sysv_shmat(struct ucred *cred, struct shmid_kernel *shmsegptr,
119 int shmflg)
120 {
121 int error;
122
123 if (!mac_enforce_sysv_shm)
124 return (0);
125
126 MAC_CHECK(check_sysv_shmat, cred, shmsegptr, shmsegptr->label,
127 shmflg);
128
129 return(error);
130 }
131
132 int
133 mac_check_sysv_shmctl(struct ucred *cred, struct shmid_kernel *shmsegptr,
134 int cmd)
135 {
136 int error;
137
138 if (!mac_enforce_sysv_shm)
139 return (0);
140
141 MAC_CHECK(check_sysv_shmctl, cred, shmsegptr, shmsegptr->label,
142 cmd);
143
144 return(error);
145 }
146
147 int
148 mac_check_sysv_shmdt(struct ucred *cred, struct shmid_kernel *shmsegptr)
149 {
150 int error;
151
152 if (!mac_enforce_sysv_shm)
153 return (0);
154
155 MAC_CHECK(check_sysv_shmdt, cred, shmsegptr, shmsegptr->label);
156
157 return(error);
158 }
159
160 int
161 mac_check_sysv_shmget(struct ucred *cred, struct shmid_kernel *shmsegptr,
162 int shmflg)
163 {
164 int error;
165
166 if (!mac_enforce_sysv_shm)
167 return (0);
168
169 MAC_CHECK(check_sysv_shmget, cred, shmsegptr, shmsegptr->label,
170 shmflg);
171
172 return(error);
173 }
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