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