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/sbuf.h>
66#include <sys/systm.h>
67#include <sys/sysctl.h>
68#include <security/mac_internal.h>
69#include <sys/posix_sem.h>
70
71
72static struct label *
73mac_posixsem_label_alloc(void)
74{
75 struct label *label;
76
77 label = mac_labelzone_alloc(MAC_WAITOK);
78 if (label == NULL)
79 return (NULL);
80 MAC_PERFORM(posixsem_label_init, label);
81 return (label);
82}
83
84void
85mac_posixsem_label_init(struct pseminfo *psem)
86{
87
88 psem->psem_label = mac_posixsem_label_alloc();
89}
90
91static void
92mac_posixsem_label_free(struct label *label)
93{
94
95 MAC_PERFORM(posixsem_label_destroy, label);
96 mac_labelzone_free(label);
97}
98
99void
100mac_posixsem_label_destroy(struct pseminfo *psem)
101{
102
103 mac_posixsem_label_free(psem->psem_label);
104 psem->psem_label = NULL;
105}
106
107void
108mac_posixsem_label_associate(kauth_cred_t cred, struct pseminfo *psem,
109 const char *name)
110{
111
112 MAC_PERFORM(posixsem_label_associate, cred, psem, psem->psem_label, name);
113}
114
115
116void
117mac_posixsem_vnode_label_associate(kauth_cred_t cred,
118 struct pseminfo *psem, struct label *plabel,
119 vnode_t vp, struct label *vlabel)
120{
121 MAC_PERFORM(vnode_label_associate_posixsem, cred,
122 psem, plabel, vp, vlabel);
123}
124
125int
126mac_posixsem_check_create(kauth_cred_t cred, const char *name)
127{
128 int error;
129
130#if SECURITY_MAC_CHECK_ENFORCE
131 /* 21167099 - only check if we allow write */
132 if (!mac_posixsem_enforce)
133 return (0);
134#endif
135
136 MAC_CHECK(posixsem_check_create, cred, name);
137
138 return (error);
139}
140
141int
142mac_posixsem_check_open(kauth_cred_t cred, struct pseminfo *psem)
143{
144 int error;
145
146#if SECURITY_MAC_CHECK_ENFORCE
147 /* 21167099 - only check if we allow write */
148 if (!mac_posixsem_enforce)
149 return (0);
150#endif
151
152 MAC_CHECK(posixsem_check_open, cred, psem,
153 psem->psem_label);
154
155 return (error);
156}
157
158int
159mac_posixsem_check_post(kauth_cred_t cred, struct pseminfo *psem)
160{
161 int error;
162
163#if SECURITY_MAC_CHECK_ENFORCE
164 /* 21167099 - only check if we allow write */
165 if (!mac_posixsem_enforce)
166 return (0);
167#endif
168
169 MAC_CHECK(posixsem_check_post, cred, psem, psem->psem_label);
170
171 return (error);
172}
173
174int
175mac_posixsem_check_unlink(kauth_cred_t cred, struct pseminfo *psem,
176 const char *name)
177{
178 int error;
179
180#if SECURITY_MAC_CHECK_ENFORCE
181 /* 21167099 - only check if we allow write */
182 if (!mac_posixsem_enforce)
183 return (0);
184#endif
185
186 MAC_CHECK(posixsem_check_unlink, cred, psem, psem->psem_label, name);
187
188 return (error);
189}
190
191int
192mac_posixsem_check_wait(kauth_cred_t cred, struct pseminfo *psem)
193{
194 int error;
195
196#if SECURITY_MAC_CHECK_ENFORCE
197 /* 21167099 - only check if we allow write */
198 if (!mac_posixsem_enforce)
199 return (0);
200#endif
201
202 MAC_CHECK(posixsem_check_wait, cred, psem, psem->psem_label);
203
204 return (error);
205}
206