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) 2003-2004 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/vnode.h>
68 #include <sys/mount.h>
69 #include <sys/file.h>
70 #include <sys/namei.h>
71 #include <sys/sysctl.h>
72 #include <sys/sem.h>
73 #include <sys/sem_internal.h>
74
75 #include <security/mac_internal.h>
76
77
78 void
mac_sysvsem_label_init(struct semid_kernel * semakptr)79 mac_sysvsem_label_init(struct semid_kernel *semakptr)
80 {
81 mac_labelzone_alloc_owned(&semakptr->label, MAC_WAITOK, ^(struct label *label) {
82 MAC_PERFORM(sysvsem_label_init, label);
83 });
84 }
85
86 struct label *
mac_sysvsem_label(struct semid_kernel * semakptr)87 mac_sysvsem_label(struct semid_kernel *semakptr)
88 {
89 return mac_label_verify(&semakptr->label);
90 }
91
92 void
mac_sysvsem_label_destroy(struct semid_kernel * semakptr)93 mac_sysvsem_label_destroy(struct semid_kernel *semakptr)
94 {
95 mac_labelzone_free_owned(&semakptr->label, ^(struct label *label) {
96 MAC_PERFORM(sysvsem_label_destroy, label);
97 });
98 }
99
100 void
mac_sysvsem_label_associate(kauth_cred_t cred,struct semid_kernel * semakptr)101 mac_sysvsem_label_associate(kauth_cred_t cred, struct semid_kernel *semakptr)
102 {
103 MAC_PERFORM(sysvsem_label_associate, cred, semakptr, mac_sysvsem_label(semakptr));
104 }
105
106 void
mac_sysvsem_label_recycle(struct semid_kernel * semakptr)107 mac_sysvsem_label_recycle(struct semid_kernel *semakptr)
108 {
109 MAC_PERFORM(sysvsem_label_recycle, mac_sysvsem_label(semakptr));
110 }
111
112 int
mac_sysvsem_check_semctl(kauth_cred_t cred,struct semid_kernel * semakptr,int cmd)113 mac_sysvsem_check_semctl(kauth_cred_t cred, struct semid_kernel *semakptr,
114 int cmd)
115 {
116 int error;
117
118 #if SECURITY_MAC_CHECK_ENFORCE
119 /* 21167099 - only check if we allow write */
120 if (!mac_sysvsem_enforce) {
121 return 0;
122 }
123 #endif
124
125 MAC_CHECK(sysvsem_check_semctl, cred, semakptr, mac_sysvsem_label(semakptr), cmd);
126
127 return error;
128 }
129
130 int
mac_sysvsem_check_semget(kauth_cred_t cred,struct semid_kernel * semakptr)131 mac_sysvsem_check_semget(kauth_cred_t cred, struct semid_kernel *semakptr)
132 {
133 int error;
134
135 #if SECURITY_MAC_CHECK_ENFORCE
136 /* 21167099 - only check if we allow write */
137 if (!mac_sysvsem_enforce) {
138 return 0;
139 }
140 #endif
141
142 MAC_CHECK(sysvsem_check_semget, cred, semakptr, mac_sysvsem_label(semakptr));
143
144 return error;
145 }
146
147 int
mac_sysvsem_check_semop(kauth_cred_t cred,struct semid_kernel * semakptr,size_t accesstype)148 mac_sysvsem_check_semop(kauth_cred_t cred, struct semid_kernel *semakptr,
149 size_t accesstype)
150 {
151 int error;
152
153 #if SECURITY_MAC_CHECK_ENFORCE
154 /* 21167099 - only check if we allow write */
155 if (!mac_sysvsem_enforce) {
156 return 0;
157 }
158 #endif
159
160 MAC_CHECK(sysvsem_check_semop, cred, semakptr, mac_sysvsem_label(semakptr),
161 accesstype);
162
163 return error;
164 }
165