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
73static struct label *
74mac_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
85void
86mac_posixshm_label_init(struct pshminfo *pshm)
87{
88
89 pshm->pshm_label = mac_posixshm_label_alloc();
90}
91
92static void
93mac_posixshm_label_free(struct label *label)
94{
95
96 MAC_PERFORM(posixshm_label_destroy, label);
97 mac_labelzone_free(label);
98}
99
100void
101mac_posixshm_label_destroy(struct pshminfo *pshm)
102{
103
104 mac_posixshm_label_free(pshm->pshm_label);
105 pshm->pshm_label = NULL;
106}
107
108void
109mac_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
117void
118mac_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
125int
126mac_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
141int
142mac_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
157int
158mac_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
175int
176mac_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
191int
192mac_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
208int
209mac_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