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) 2002, 2003 Networks Associates Technology, Inc. |
30 | * Copyright (c) 2005 SPARTA, Inc. |
31 | * All rights reserved. |
32 | * |
33 | * This software was developed for the FreeBSD Project in part by Network |
34 | * Associates Laboratories, the Security Research Division of Network |
35 | * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), |
36 | * as part of the DARPA CHATS research program. |
37 | * |
38 | * Redistribution and use in source and binary forms, with or without |
39 | * modification, are permitted provided that the following conditions |
40 | * are met: |
41 | * 1. Redistributions of source code must retain the above copyright |
42 | * notice, this list of conditions and the following disclaimer. |
43 | * 2. Redistributions in binary form must reproduce the above copyright |
44 | * notice, this list of conditions and the following disclaimer in the |
45 | * documentation and/or other materials provided with the distribution. |
46 | * |
47 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
48 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
49 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
50 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
51 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
52 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
53 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
54 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
55 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
56 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
57 | * SUCH DAMAGE. |
58 | */ |
59 | |
60 | #include <sys/cdefs.h> |
61 | |
62 | #include <sys/param.h> |
63 | #include <sys/kernel.h> |
64 | #include <sys/lock.h> |
65 | #include <sys/malloc.h> |
66 | #include <sys/sbuf.h> |
67 | #include <sys/systm.h> |
68 | #include <sys/vnode.h> |
69 | #include <sys/pipe.h> |
70 | #include <sys/sysctl.h> |
71 | |
72 | #include <security/mac_internal.h> |
73 | |
74 | |
75 | static struct label * |
76 | mac_pipe_label_alloc(void) |
77 | { |
78 | struct label *label; |
79 | |
80 | label = mac_labelzone_alloc(MAC_WAITOK); |
81 | if (label == NULL) { |
82 | return NULL; |
83 | } |
84 | MAC_PERFORM(pipe_label_init, label); |
85 | return label; |
86 | } |
87 | |
88 | struct label * |
89 | mac_pipe_label(struct pipe *cpipe) |
90 | { |
91 | return cpipe->pipe_label; |
92 | } |
93 | |
94 | void |
95 | mac_pipe_set_label(struct pipe *cpipe, struct label *label) |
96 | { |
97 | cpipe->pipe_label = label; |
98 | } |
99 | |
100 | void |
101 | mac_pipe_label_init(struct pipe *cpipe) |
102 | { |
103 | mac_pipe_set_label(cpipe, label: mac_pipe_label_alloc()); |
104 | } |
105 | |
106 | void |
107 | mac_pipe_label_free(struct label *label) |
108 | { |
109 | MAC_PERFORM(pipe_label_destroy, label); |
110 | mac_labelzone_free(l: label); |
111 | } |
112 | |
113 | void |
114 | mac_pipe_label_destroy(struct pipe *cpipe) |
115 | { |
116 | struct label *label = mac_pipe_label(cpipe); |
117 | mac_pipe_set_label(cpipe, NULL); |
118 | mac_pipe_label_free(label); |
119 | } |
120 | |
121 | void |
122 | mac_pipe_label_associate(kauth_cred_t cred, struct pipe *cpipe) |
123 | { |
124 | MAC_PERFORM(pipe_label_associate, cred, cpipe, mac_pipe_label(cpipe)); |
125 | } |
126 | |
127 | int |
128 | mac_pipe_check_kqfilter(kauth_cred_t cred, struct knote *kn, |
129 | struct pipe *cpipe) |
130 | { |
131 | int error; |
132 | |
133 | #if SECURITY_MAC_CHECK_ENFORCE |
134 | /* 21167099 - only check if we allow write */ |
135 | if (!mac_pipe_enforce) { |
136 | return 0; |
137 | } |
138 | #endif |
139 | MAC_CHECK(pipe_check_kqfilter, cred, kn, cpipe, mac_pipe_label(cpipe)); |
140 | return error; |
141 | } |
142 | int |
143 | mac_pipe_check_ioctl(kauth_cred_t cred, struct pipe *cpipe, u_long cmd) |
144 | { |
145 | int error; |
146 | |
147 | #if SECURITY_MAC_CHECK_ENFORCE |
148 | /* 21167099 - only check if we allow write */ |
149 | if (!mac_pipe_enforce) { |
150 | return 0; |
151 | } |
152 | #endif |
153 | |
154 | MAC_CHECK(pipe_check_ioctl, cred, cpipe, mac_pipe_label(cpipe), cmd); |
155 | |
156 | return error; |
157 | } |
158 | |
159 | int |
160 | mac_pipe_check_read(kauth_cred_t cred, struct pipe *cpipe) |
161 | { |
162 | int error; |
163 | |
164 | #if SECURITY_MAC_CHECK_ENFORCE |
165 | /* 21167099 - only check if we allow write */ |
166 | if (!mac_pipe_enforce) { |
167 | return 0; |
168 | } |
169 | #endif |
170 | |
171 | MAC_CHECK(pipe_check_read, cred, cpipe, mac_pipe_label(cpipe)); |
172 | |
173 | return error; |
174 | } |
175 | |
176 | int |
177 | mac_pipe_check_select(kauth_cred_t cred, struct pipe *cpipe, int which) |
178 | { |
179 | int error; |
180 | |
181 | #if SECURITY_MAC_CHECK_ENFORCE |
182 | /* 21167099 - only check if we allow write */ |
183 | if (!mac_pipe_enforce) { |
184 | return 0; |
185 | } |
186 | #endif |
187 | |
188 | MAC_CHECK(pipe_check_select, cred, cpipe, mac_pipe_label(cpipe), which); |
189 | |
190 | return error; |
191 | } |
192 | |
193 | int |
194 | mac_pipe_check_stat(kauth_cred_t cred, struct pipe *cpipe) |
195 | { |
196 | int error; |
197 | |
198 | #if SECURITY_MAC_CHECK_ENFORCE |
199 | /* 21167099 - only check if we allow write */ |
200 | if (!mac_pipe_enforce) { |
201 | return 0; |
202 | } |
203 | #endif |
204 | |
205 | MAC_CHECK(pipe_check_stat, cred, cpipe, mac_pipe_label(cpipe)); |
206 | |
207 | return error; |
208 | } |
209 | |
210 | int |
211 | mac_pipe_check_write(kauth_cred_t cred, struct pipe *cpipe) |
212 | { |
213 | int error; |
214 | |
215 | #if SECURITY_MAC_CHECK_ENFORCE |
216 | /* 21167099 - only check if we allow write */ |
217 | if (!mac_pipe_enforce) { |
218 | return 0; |
219 | } |
220 | #endif |
221 | |
222 | MAC_CHECK(pipe_check_write, cred, cpipe, mac_pipe_label(cpipe)); |
223 | |
224 | return error; |
225 | } |
226 | |