1 /*-
2 * Copyright (c) 2002-2003 Networks Associates Technology, Inc.
3 * Copyright (c) 2006 SPARTA, Inc.
4 * Copyright (c) 2009 Robert N. M. Watson
5 * All rights reserved.
6 *
7 * This software was developed for the FreeBSD Project in part by Network
8 * Associates Laboratories, the Security Research Division of Network
9 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
10 * as part of the DARPA CHATS research program.
11 *
12 * This software was enhanced by SPARTA ISSO under SPAWAR contract
13 * N66001-04-C-6019 ("SEFOS").
14 *
15 * This software was developed at the University of Cambridge Computer
16 * Laboratory with support from a grant from Google, Inc.
17 *
18 * Redistribution and use in source and binary forms, with or without
19 * modification, are permitted provided that the following conditions
20 * are met:
21 * 1. Redistributions of source code must retain the above copyright
22 * notice, this list of conditions and the following disclaimer.
23 * 2. Redistributions in binary form must reproduce the above copyright
24 * notice, this list of conditions and the following disclaimer in the
25 * documentation and/or other materials provided with the distribution.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * SUCH DAMAGE.
38 */
39
40 #include <sys/cdefs.h>
41 __FBSDID("$FreeBSD: releng/10.0/sys/security/mac/mac_pipe.c 191731 2009-05-01 21:05:40Z rwatson $");
42
43 #include "opt_kdtrace.h"
44 #include "opt_mac.h"
45
46 #include <sys/param.h>
47 #include <sys/kernel.h>
48 #include <sys/lock.h>
49 #include <sys/malloc.h>
50 #include <sys/module.h>
51 #include <sys/mutex.h>
52 #include <sys/sbuf.h>
53 #include <sys/sdt.h>
54 #include <sys/systm.h>
55 #include <sys/vnode.h>
56 #include <sys/pipe.h>
57 #include <sys/sysctl.h>
58
59 #include <security/mac/mac_framework.h>
60 #include <security/mac/mac_internal.h>
61 #include <security/mac/mac_policy.h>
62
63 struct label *
64 mac_pipe_label_alloc(void)
65 {
66 struct label *label;
67
68 label = mac_labelzone_alloc(M_WAITOK);
69 MAC_POLICY_PERFORM(pipe_init_label, label);
70 return (label);
71 }
72
73 void
74 mac_pipe_init(struct pipepair *pp)
75 {
76
77 if (mac_labeled & MPC_OBJECT_PIPE)
78 pp->pp_label = mac_pipe_label_alloc();
79 else
80 pp->pp_label = NULL;
81 }
82
83 void
84 mac_pipe_label_free(struct label *label)
85 {
86
87 MAC_POLICY_PERFORM_NOSLEEP(pipe_destroy_label, label);
88 mac_labelzone_free(label);
89 }
90
91 void
92 mac_pipe_destroy(struct pipepair *pp)
93 {
94
95 if (pp->pp_label != NULL) {
96 mac_pipe_label_free(pp->pp_label);
97 pp->pp_label = NULL;
98 }
99 }
100
101 void
102 mac_pipe_copy_label(struct label *src, struct label *dest)
103 {
104
105 MAC_POLICY_PERFORM_NOSLEEP(pipe_copy_label, src, dest);
106 }
107
108 int
109 mac_pipe_externalize_label(struct label *label, char *elements,
110 char *outbuf, size_t outbuflen)
111 {
112 int error;
113
114 MAC_POLICY_EXTERNALIZE(pipe, label, elements, outbuf, outbuflen);
115
116 return (error);
117 }
118
119 int
120 mac_pipe_internalize_label(struct label *label, char *string)
121 {
122 int error;
123
124 MAC_POLICY_INTERNALIZE(pipe, label, string);
125
126 return (error);
127 }
128
129 void
130 mac_pipe_create(struct ucred *cred, struct pipepair *pp)
131 {
132
133 MAC_POLICY_PERFORM_NOSLEEP(pipe_create, cred, pp, pp->pp_label);
134 }
135
136 static void
137 mac_pipe_relabel(struct ucred *cred, struct pipepair *pp,
138 struct label *newlabel)
139 {
140
141 MAC_POLICY_PERFORM_NOSLEEP(pipe_relabel, cred, pp, pp->pp_label,
142 newlabel);
143 }
144
145 MAC_CHECK_PROBE_DEFINE4(pipe_check_ioctl, "struct ucred *",
146 "struct pipepair *", "unsigned long", "void *");
147
148 int
149 mac_pipe_check_ioctl(struct ucred *cred, struct pipepair *pp,
150 unsigned long cmd, void *data)
151 {
152 int error;
153
154 mtx_assert(&pp->pp_mtx, MA_OWNED);
155
156 MAC_POLICY_CHECK_NOSLEEP(pipe_check_ioctl, cred, pp, pp->pp_label,
157 cmd, data);
158 MAC_CHECK_PROBE4(pipe_check_ioctl, error, cred, pp, cmd, data);
159
160 return (error);
161 }
162
163 MAC_CHECK_PROBE_DEFINE2(pipe_check_poll, "struct ucred *",
164 "struct pipepair *");
165
166 int
167 mac_pipe_check_poll(struct ucred *cred, struct pipepair *pp)
168 {
169 int error;
170
171 mtx_assert(&pp->pp_mtx, MA_OWNED);
172
173 MAC_POLICY_CHECK_NOSLEEP(pipe_check_poll, cred, pp, pp->pp_label);
174 MAC_CHECK_PROBE2(pipe_check_poll, error, cred, pp);
175
176 return (error);
177 }
178
179 MAC_CHECK_PROBE_DEFINE2(pipe_check_read, "struct ucred *",
180 "struct pipepair *");
181
182 int
183 mac_pipe_check_read(struct ucred *cred, struct pipepair *pp)
184 {
185 int error;
186
187 mtx_assert(&pp->pp_mtx, MA_OWNED);
188
189 MAC_POLICY_CHECK_NOSLEEP(pipe_check_read, cred, pp, pp->pp_label);
190 MAC_CHECK_PROBE2(pipe_check_read, error, cred, pp);
191
192 return (error);
193 }
194
195 MAC_CHECK_PROBE_DEFINE3(pipe_check_relabel, "struct ucred *",
196 "struct pipepair *", "struct label *");
197
198 static int
199 mac_pipe_check_relabel(struct ucred *cred, struct pipepair *pp,
200 struct label *newlabel)
201 {
202 int error;
203
204 mtx_assert(&pp->pp_mtx, MA_OWNED);
205
206 MAC_POLICY_CHECK_NOSLEEP(pipe_check_relabel, cred, pp, pp->pp_label,
207 newlabel);
208 MAC_CHECK_PROBE3(pipe_check_relabel, error, cred, pp, newlabel);
209
210 return (error);
211 }
212
213 MAC_CHECK_PROBE_DEFINE2(pipe_check_stat, "struct ucred *",
214 "struct pipepair *");
215
216 int
217 mac_pipe_check_stat(struct ucred *cred, struct pipepair *pp)
218 {
219 int error;
220
221 mtx_assert(&pp->pp_mtx, MA_OWNED);
222
223 MAC_POLICY_CHECK_NOSLEEP(pipe_check_stat, cred, pp, pp->pp_label);
224 MAC_CHECK_PROBE2(pipe_check_stat, error, cred, pp);
225
226 return (error);
227 }
228
229 MAC_CHECK_PROBE_DEFINE2(pipe_check_write, "struct ucred *",
230 "struct pipepair *");
231
232 int
233 mac_pipe_check_write(struct ucred *cred, struct pipepair *pp)
234 {
235 int error;
236
237 mtx_assert(&pp->pp_mtx, MA_OWNED);
238
239 MAC_POLICY_CHECK_NOSLEEP(pipe_check_write, cred, pp, pp->pp_label);
240 MAC_CHECK_PROBE2(pipe_check_write, error, cred, pp);
241
242 return (error);
243 }
244
245 int
246 mac_pipe_label_set(struct ucred *cred, struct pipepair *pp,
247 struct label *label)
248 {
249 int error;
250
251 mtx_assert(&pp->pp_mtx, MA_OWNED);
252
253 error = mac_pipe_check_relabel(cred, pp, label);
254 if (error)
255 return (error);
256
257 mac_pipe_relabel(cred, pp, label);
258
259 return (0);
260 }
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