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) 2003-2005 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/param.h> |
62 | #include <sys/kernel.h> |
63 | #include <sys/lock.h> |
64 | #include <sys/malloc.h> |
65 | #include <sys/posix_shm.h> |
66 | #include <sys/sbuf.h> |
67 | #include <sys/systm.h> |
68 | #include <sys/sysctl.h> |
69 | #include <sys/vnode.h> |
70 | |
71 | #include <security/mac_internal.h> |
72 | |
73 | static struct label * |
74 | mac_posixshm_label_alloc(void) |
75 | { |
76 | struct label *label; |
77 | |
78 | label = mac_labelzone_alloc(MAC_WAITOK); |
79 | if (label == NULL) |
80 | return (NULL); |
81 | MAC_PERFORM(posixshm_label_init, label); |
82 | return (label); |
83 | } |
84 | |
85 | void |
86 | mac_posixshm_label_init(struct pshminfo *pshm) |
87 | { |
88 | |
89 | pshm->pshm_label = mac_posixshm_label_alloc(); |
90 | } |
91 | |
92 | static void |
93 | mac_posixshm_label_free(struct label *label) |
94 | { |
95 | |
96 | MAC_PERFORM(posixshm_label_destroy, label); |
97 | mac_labelzone_free(label); |
98 | } |
99 | |
100 | void |
101 | mac_posixshm_label_destroy(struct pshminfo *pshm) |
102 | { |
103 | |
104 | mac_posixshm_label_free(pshm->pshm_label); |
105 | pshm->pshm_label = NULL; |
106 | } |
107 | |
108 | void |
109 | mac_posixshm_vnode_label_associate(kauth_cred_t cred, |
110 | struct pshminfo *pshm, struct label *plabel, |
111 | vnode_t vp, struct label *vlabel) |
112 | { |
113 | MAC_PERFORM(vnode_label_associate_posixshm, cred, |
114 | pshm, plabel, vp, vlabel); |
115 | } |
116 | |
117 | void |
118 | mac_posixshm_label_associate(kauth_cred_t cred, struct pshminfo *pshm, |
119 | const char *name) |
120 | { |
121 | |
122 | MAC_PERFORM(posixshm_label_associate, cred, pshm, pshm->pshm_label, name); |
123 | } |
124 | |
125 | int |
126 | mac_posixshm_check_create(kauth_cred_t cred, const char *name) |
127 | { |
128 | int error = 0; |
129 | |
130 | #if SECURITY_MAC_CHECK_ENFORCE |
131 | /* 21167099 - only check if we allow write */ |
132 | if (!mac_posixshm_enforce) |
133 | return 0; |
134 | #endif |
135 | |
136 | MAC_CHECK(posixshm_check_create, cred, name); |
137 | |
138 | return error; |
139 | } |
140 | |
141 | int |
142 | mac_posixshm_check_open(kauth_cred_t cred, struct pshminfo *shm, int fflags) |
143 | { |
144 | int error = 0; |
145 | |
146 | #if SECURITY_MAC_CHECK_ENFORCE |
147 | /* 21167099 - only check if we allow write */ |
148 | if (!mac_posixshm_enforce) |
149 | return 0; |
150 | #endif |
151 | |
152 | MAC_CHECK(posixshm_check_open, cred, shm, shm->pshm_label, fflags); |
153 | |
154 | return (error); |
155 | } |
156 | |
157 | int |
158 | mac_posixshm_check_mmap(kauth_cred_t cred, struct pshminfo *shm, |
159 | int prot, int flags) |
160 | { |
161 | int error = 0; |
162 | |
163 | #if SECURITY_MAC_CHECK_ENFORCE |
164 | /* 21167099 - only check if we allow write */ |
165 | if (!mac_posixshm_enforce) |
166 | return 0; |
167 | #endif |
168 | |
169 | MAC_CHECK(posixshm_check_mmap, cred, shm, shm->pshm_label, |
170 | prot, flags); |
171 | |
172 | return (error); |
173 | } |
174 | |
175 | int |
176 | mac_posixshm_check_stat(kauth_cred_t cred, struct pshminfo *shm) |
177 | { |
178 | int error = 0; |
179 | |
180 | #if SECURITY_MAC_CHECK_ENFORCE |
181 | /* 21167099 - only check if we allow write */ |
182 | if (!mac_posixshm_enforce) |
183 | return 0; |
184 | #endif |
185 | |
186 | MAC_CHECK(posixshm_check_stat, cred, shm, shm->pshm_label); |
187 | |
188 | return (error); |
189 | } |
190 | |
191 | int |
192 | mac_posixshm_check_truncate(kauth_cred_t cred, struct pshminfo *shm, |
193 | off_t size) |
194 | { |
195 | int error = 0; |
196 | |
197 | #if SECURITY_MAC_CHECK_ENFORCE |
198 | /* 21167099 - only check if we allow write */ |
199 | if (!mac_posixshm_enforce) |
200 | return 0; |
201 | #endif |
202 | |
203 | MAC_CHECK(posixshm_check_truncate, cred, shm, shm->pshm_label, size); |
204 | |
205 | return (error); |
206 | } |
207 | |
208 | int |
209 | mac_posixshm_check_unlink(kauth_cred_t cred, struct pshminfo *shm, |
210 | const char *name) |
211 | { |
212 | int error = 0; |
213 | |
214 | #if SECURITY_MAC_CHECK_ENFORCE |
215 | /* 21167099 - only check if we allow write */ |
216 | if (!mac_posixshm_enforce) |
217 | return 0; |
218 | #endif |
219 | |
220 | MAC_CHECK(posixshm_check_unlink, cred, shm, shm->pshm_label, name); |
221 | |
222 | return (error); |
223 | } |
224 | |