1 /*
2 * Copyright (c) 2007 Apple Inc. All rights reserved.
3 *
4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. The rights granted to you under the License
10 * may not be used to create, or enable the creation or redistribution of,
11 * unlawful or unlicensed copies of an Apple operating system, or to
12 * circumvent, violate, or enable the circumvention or violation of, any
13 * terms of an Apple operating system software license agreement.
14 *
15 * Please obtain a copy of the License at
16 * http://www.opensource.apple.com/apsl/ and read it before using this file.
17 *
18 * The Original Code and all software distributed under the License are
19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23 * Please see the License for the specific language governing rights and
24 * limitations under the License.
25 *
26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27 */
28 /*-
29 * Copyright (c) 2003-2004 Networks Associates Technology, Inc.
30 * All rights reserved.
31 *
32 * This software was developed for the FreeBSD Project in part by Network
33 * Associates Laboratories, the Security Research Division of Network
34 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
35 * as part of the DARPA CHATS research program.
36 *
37 * Redistribution and use in source and binary forms, with or without
38 * modification, are permitted provided that the following conditions
39 * are met:
40 * 1. Redistributions of source code must retain the above copyright
41 * notice, this list of conditions and the following disclaimer.
42 * 2. Redistributions in binary form must reproduce the above copyright
43 * notice, this list of conditions and the following disclaimer in the
44 * documentation and/or other materials provided with the distribution.
45 *
46 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
47 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
48 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
49 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
50 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
51 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
52 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
53 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
54 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
55 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
56 * SUCH DAMAGE.
57 */
58
59 #include <sys/cdefs.h>
60
61 #include <sys/cdefs.h>
62
63 #include <sys/param.h>
64 #include <sys/kernel.h>
65 #include <sys/lock.h>
66 #include <sys/malloc.h>
67 #include <sys/sbuf.h>
68 #include <sys/systm.h>
69 #include <sys/vnode.h>
70 #include <sys/mount.h>
71 #include <sys/file.h>
72 #include <sys/namei.h>
73 #include <sys/sysctl.h>
74 #include <sys/shm.h>
75 #include <sys/shm_internal.h>
76
77 #include <security/mac_internal.h>
78
79
80 void
mac_sysvshm_label_init(struct shmid_kernel * shmsegptr)81 mac_sysvshm_label_init(struct shmid_kernel *shmsegptr)
82 {
83 mac_labelzone_alloc_owned(&shmsegptr->label, MAC_WAITOK, ^(struct label *label) {
84 MAC_PERFORM(sysvshm_label_init, label);
85 });
86 }
87
88 struct label *
mac_sysvshm_label(struct shmid_kernel * shmsegptr)89 mac_sysvshm_label(struct shmid_kernel *shmsegptr)
90 {
91 return mac_label_verify(&shmsegptr->label);
92 }
93
94 void
mac_sysvshm_label_destroy(struct shmid_kernel * shmsegptr)95 mac_sysvshm_label_destroy(struct shmid_kernel *shmsegptr)
96 {
97 mac_labelzone_free_owned(&shmsegptr->label, ^(struct label *label) {
98 MAC_PERFORM(sysvshm_label_destroy, label);
99 });
100 }
101
102 void
mac_sysvshm_label_associate(struct ucred * cred,struct shmid_kernel * shmsegptr)103 mac_sysvshm_label_associate(struct ucred *cred, struct shmid_kernel *shmsegptr)
104 {
105 MAC_PERFORM(sysvshm_label_associate, cred, shmsegptr, mac_sysvshm_label(shmsegptr));
106 }
107
108 void
mac_sysvshm_label_recycle(struct shmid_kernel * shmsegptr)109 mac_sysvshm_label_recycle(struct shmid_kernel *shmsegptr)
110 {
111 MAC_PERFORM(sysvshm_label_recycle, mac_sysvshm_label(shmsegptr));
112 }
113
114 int
mac_sysvshm_check_shmat(struct ucred * cred,struct shmid_kernel * shmsegptr,int shmflg)115 mac_sysvshm_check_shmat(struct ucred *cred, struct shmid_kernel *shmsegptr,
116 int shmflg)
117 {
118 int error;
119
120 #if SECURITY_MAC_CHECK_ENFORCE
121 /* 21167099 - only check if we allow write */
122 if (!mac_sysvshm_enforce) {
123 return 0;
124 }
125 #endif
126
127 MAC_CHECK(sysvshm_check_shmat, cred, shmsegptr, mac_sysvshm_label(shmsegptr),
128 shmflg);
129
130 return error;
131 }
132
133 int
mac_sysvshm_check_shmctl(struct ucred * cred,struct shmid_kernel * shmsegptr,int cmd)134 mac_sysvshm_check_shmctl(struct ucred *cred, struct shmid_kernel *shmsegptr,
135 int cmd)
136 {
137 int error;
138
139 #if SECURITY_MAC_CHECK_ENFORCE
140 /* 21167099 - only check if we allow write */
141 if (!mac_sysvshm_enforce) {
142 return 0;
143 }
144 #endif
145
146 MAC_CHECK(sysvshm_check_shmctl, cred, shmsegptr, mac_sysvshm_label(shmsegptr),
147 cmd);
148
149 return error;
150 }
151
152 int
mac_sysvshm_check_shmdt(struct ucred * cred,struct shmid_kernel * shmsegptr)153 mac_sysvshm_check_shmdt(struct ucred *cred, struct shmid_kernel *shmsegptr)
154 {
155 int error;
156
157 #if SECURITY_MAC_CHECK_ENFORCE
158 /* 21167099 - only check if we allow write */
159 if (!mac_sysvshm_enforce) {
160 return 0;
161 }
162 #endif
163
164 MAC_CHECK(sysvshm_check_shmdt, cred, shmsegptr, mac_sysvshm_label(shmsegptr));
165
166 return error;
167 }
168
169 int
mac_sysvshm_check_shmget(struct ucred * cred,struct shmid_kernel * shmsegptr,int shmflg)170 mac_sysvshm_check_shmget(struct ucred *cred, struct shmid_kernel *shmsegptr,
171 int shmflg)
172 {
173 int error;
174
175 #if SECURITY_MAC_CHECK_ENFORCE
176 /* 21167099 - only check if we allow write */
177 if (!mac_sysvshm_enforce) {
178 return 0;
179 }
180 #endif
181
182 MAC_CHECK(sysvshm_check_shmget, cred, shmsegptr, mac_sysvshm_label(shmsegptr),
183 shmflg);
184
185 return error;
186 }
187