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