1 /*-
2 * Copyright (c) 2002, 2003 Networks Associates Technology, Inc.
3 * All rights reserved.
4 *
5 * This software was developed for the FreeBSD Project in part by Network
6 * Associates Laboratories, the Security Research Division of Network
7 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
8 * as part of the DARPA CHATS research program.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD: releng/5.2/sys/security/mac/mac_pipe.c 122524 2003-11-12 03:14:31Z rwatson $");
34
35 #include "opt_mac.h"
36
37 #include <sys/param.h>
38 #include <sys/kernel.h>
39 #include <sys/lock.h>
40 #include <sys/malloc.h>
41 #include <sys/mutex.h>
42 #include <sys/mac.h>
43 #include <sys/sbuf.h>
44 #include <sys/systm.h>
45 #include <sys/vnode.h>
46 #include <sys/pipe.h>
47 #include <sys/sysctl.h>
48
49 #include <sys/mac_policy.h>
50
51 #include <security/mac/mac_internal.h>
52
53 static int mac_enforce_pipe = 1;
54 SYSCTL_INT(_security_mac, OID_AUTO, enforce_pipe, CTLFLAG_RW,
55 &mac_enforce_pipe, 0, "Enforce MAC policy on pipe operations");
56 TUNABLE_INT("security.mac.enforce_pipe", &mac_enforce_pipe);
57
58 #ifdef MAC_DEBUG
59 static unsigned int nmacpipes;
60 SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, pipes, CTLFLAG_RD,
61 &nmacpipes, 0, "number of pipes in use");
62 #endif
63
64 struct label *
65 mac_pipe_label_alloc(void)
66 {
67 struct label *label;
68
69 label = mac_labelzone_alloc(M_WAITOK);
70 MAC_PERFORM(init_pipe_label, label);
71 MAC_DEBUG_COUNTER_INC(&nmacpipes);
72 return (label);
73 }
74
75 void
76 mac_init_pipe(struct pipe *pipe)
77 {
78
79 pipe->pipe_label = pipe->pipe_peer->pipe_label =
80 mac_pipe_label_alloc();
81 }
82
83 void
84 mac_pipe_label_free(struct label *label)
85 {
86
87 MAC_PERFORM(destroy_pipe_label, label);
88 mac_labelzone_free(label);
89 MAC_DEBUG_COUNTER_DEC(&nmacpipes);
90 }
91
92 void
93 mac_destroy_pipe(struct pipe *pipe)
94 {
95
96 mac_pipe_label_free(pipe->pipe_label);
97 pipe->pipe_label = NULL;
98 }
99
100 void
101 mac_copy_pipe_label(struct label *src, struct label *dest)
102 {
103
104 MAC_PERFORM(copy_pipe_label, src, dest);
105 }
106
107 int
108 mac_externalize_pipe_label(struct label *label, char *elements,
109 char *outbuf, size_t outbuflen)
110 {
111 int error;
112
113 MAC_EXTERNALIZE(pipe, label, elements, outbuf, outbuflen);
114
115 return (error);
116 }
117
118 int
119 mac_internalize_pipe_label(struct label *label, char *string)
120 {
121 int error;
122
123 MAC_INTERNALIZE(pipe, label, string);
124
125 return (error);
126 }
127
128 void
129 mac_create_pipe(struct ucred *cred, struct pipe *pipe)
130 {
131
132 MAC_PERFORM(create_pipe, cred, pipe, pipe->pipe_label);
133 }
134
135 static void
136 mac_relabel_pipe(struct ucred *cred, struct pipe *pipe, struct label *newlabel)
137 {
138
139 MAC_PERFORM(relabel_pipe, cred, pipe, pipe->pipe_label, newlabel);
140 }
141
142 int
143 mac_check_pipe_ioctl(struct ucred *cred, struct pipe *pipe, unsigned long cmd,
144 void *data)
145 {
146 int error;
147
148 PIPE_LOCK_ASSERT(pipe, MA_OWNED);
149
150 if (!mac_enforce_pipe)
151 return (0);
152
153 MAC_CHECK(check_pipe_ioctl, cred, pipe, pipe->pipe_label, cmd, data);
154
155 return (error);
156 }
157
158 int
159 mac_check_pipe_poll(struct ucred *cred, struct pipe *pipe)
160 {
161 int error;
162
163 PIPE_LOCK_ASSERT(pipe, MA_OWNED);
164
165 if (!mac_enforce_pipe)
166 return (0);
167
168 MAC_CHECK(check_pipe_poll, cred, pipe, pipe->pipe_label);
169
170 return (error);
171 }
172
173 int
174 mac_check_pipe_read(struct ucred *cred, struct pipe *pipe)
175 {
176 int error;
177
178 PIPE_LOCK_ASSERT(pipe, MA_OWNED);
179
180 if (!mac_enforce_pipe)
181 return (0);
182
183 MAC_CHECK(check_pipe_read, cred, pipe, pipe->pipe_label);
184
185 return (error);
186 }
187
188 static int
189 mac_check_pipe_relabel(struct ucred *cred, struct pipe *pipe,
190 struct label *newlabel)
191 {
192 int error;
193
194 PIPE_LOCK_ASSERT(pipe, MA_OWNED);
195
196 if (!mac_enforce_pipe)
197 return (0);
198
199 MAC_CHECK(check_pipe_relabel, cred, pipe, pipe->pipe_label, newlabel);
200
201 return (error);
202 }
203
204 int
205 mac_check_pipe_stat(struct ucred *cred, struct pipe *pipe)
206 {
207 int error;
208
209 PIPE_LOCK_ASSERT(pipe, MA_OWNED);
210
211 if (!mac_enforce_pipe)
212 return (0);
213
214 MAC_CHECK(check_pipe_stat, cred, pipe, pipe->pipe_label);
215
216 return (error);
217 }
218
219 int
220 mac_check_pipe_write(struct ucred *cred, struct pipe *pipe)
221 {
222 int error;
223
224 PIPE_LOCK_ASSERT(pipe, MA_OWNED);
225
226 if (!mac_enforce_pipe)
227 return (0);
228
229 MAC_CHECK(check_pipe_write, cred, pipe, pipe->pipe_label);
230
231 return (error);
232 }
233
234 int
235 mac_pipe_label_set(struct ucred *cred, struct pipe *pipe, struct label *label)
236 {
237 int error;
238
239 PIPE_LOCK_ASSERT(pipe, MA_OWNED);
240
241 error = mac_check_pipe_relabel(cred, pipe, label);
242 if (error)
243 return (error);
244
245 mac_relabel_pipe(cred, pipe, label);
246
247 return (0);
248 }
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