1 /*-
2 * Copyright (c) 2003-2006 SPARTA, Inc.
3 * Copyright (c) 2009-2011 Robert N. M. Watson
4 * All rights reserved.
5 *
6 * This software was developed for the FreeBSD Project in part by Network
7 * Associates Laboratories, the Security Research Division of Network
8 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
9 * as part of the DARPA CHATS research program.
10 *
11 * This software was enhanced by SPARTA ISSO under SPAWAR contract
12 * N66001-04-C-6019 ("SEFOS"). *
13 *
14 * This software was developed at the University of Cambridge Computer
15 * Laboratory with support from a grant from Google, Inc.
16 *
17 * Redistribution and use in source and binary forms, with or without
18 * modification, are permitted provided that the following conditions
19 * are met:
20 * 1. Redistributions of source code must retain the above copyright
21 * notice, this list of conditions and the following disclaimer.
22 * 2. Redistributions in binary form must reproduce the above copyright
23 * notice, this list of conditions and the following disclaimer in the
24 * documentation and/or other materials provided with the distribution.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 */
38
39 #include <sys/cdefs.h>
40 __FBSDID("$FreeBSD$");
41
42 #include "opt_kdtrace.h"
43 #include "opt_mac.h"
44
45 #include <sys/param.h>
46 #include <sys/kernel.h>
47 #include <sys/mman.h>
48 #include <sys/malloc.h>
49 #include <sys/module.h>
50 #include <sys/sdt.h>
51 #include <sys/systm.h>
52 #include <sys/sysctl.h>
53
54 #include <security/mac/mac_framework.h>
55 #include <security/mac/mac_internal.h>
56 #include <security/mac/mac_policy.h>
57
58 static struct label *
59 mac_posixshm_label_alloc(void)
60 {
61 struct label *label;
62
63 label = mac_labelzone_alloc(M_WAITOK);
64 MAC_POLICY_PERFORM(posixshm_init_label, label);
65 return (label);
66 }
67
68 void
69 mac_posixshm_init(struct shmfd *shmfd)
70 {
71
72 if (mac_labeled & MPC_OBJECT_POSIXSHM)
73 shmfd->shm_label = mac_posixshm_label_alloc();
74 else
75 shmfd->shm_label = NULL;
76 }
77
78 static void
79 mac_posixshm_label_free(struct label *label)
80 {
81
82 MAC_POLICY_PERFORM_NOSLEEP(posixshm_destroy_label, label);
83 mac_labelzone_free(label);
84 }
85
86 void
87 mac_posixshm_destroy(struct shmfd *shmfd)
88 {
89
90 if (shmfd->shm_label != NULL) {
91 mac_posixshm_label_free(shmfd->shm_label);
92 shmfd->shm_label = NULL;
93 }
94 }
95
96 void
97 mac_posixshm_create(struct ucred *cred, struct shmfd *shmfd)
98 {
99
100 MAC_POLICY_PERFORM_NOSLEEP(posixshm_create, cred, shmfd,
101 shmfd->shm_label);
102 }
103
104 MAC_CHECK_PROBE_DEFINE2(posixshm_check_create, "struct ucred *",
105 "const char *");
106
107 int
108 mac_posixshm_check_create(struct ucred *cred, const char *path)
109 {
110 int error;
111
112 MAC_POLICY_CHECK_NOSLEEP(posixshm_check_create, cred, path);
113 MAC_CHECK_PROBE2(posixshm_check_create, error, cred, path);
114
115 return (error);
116 }
117
118 MAC_CHECK_PROBE_DEFINE4(posixshm_check_mmap, "struct ucred *",
119 "struct shmfd *", "int", "int");
120
121 int
122 mac_posixshm_check_mmap(struct ucred *cred, struct shmfd *shmfd, int prot,
123 int flags)
124 {
125 int error;
126
127 MAC_POLICY_CHECK_NOSLEEP(posixshm_check_mmap, cred, shmfd,
128 shmfd->shm_label, prot, flags);
129 MAC_CHECK_PROBE4(posixshm_check_mmap, error, cred, shmfd, prot,
130 flags);
131
132 return (error);
133 }
134
135 MAC_CHECK_PROBE_DEFINE3(posixshm_check_open, "struct ucred *",
136 "struct shmfd *", "accmode_t");
137
138 int
139 mac_posixshm_check_open(struct ucred *cred, struct shmfd *shmfd,
140 accmode_t accmode)
141 {
142 int error;
143
144 MAC_POLICY_CHECK_NOSLEEP(posixshm_check_open, cred, shmfd,
145 shmfd->shm_label, accmode);
146 MAC_CHECK_PROBE3(posixshm_check_open, error, cred, shmfd, accmode);
147
148 return (error);
149 }
150
151 MAC_CHECK_PROBE_DEFINE3(posixshm_check_stat, "struct ucred *",
152 "struct ucred *", "struct shmfd *");
153
154 int
155 mac_posixshm_check_stat(struct ucred *active_cred, struct ucred *file_cred,
156 struct shmfd *shmfd)
157 {
158 int error;
159
160 MAC_POLICY_CHECK_NOSLEEP(posixshm_check_stat, active_cred, file_cred,
161 shmfd, shmfd->shm_label);
162 MAC_CHECK_PROBE3(posixshm_check_stat, error, active_cred, file_cred,
163 shmfd);
164
165 return (error);
166 }
167
168 MAC_CHECK_PROBE_DEFINE3(posixshm_check_truncate, "struct ucred *",
169 "struct ucred *", "struct shmfd *");
170
171 int
172 mac_posixshm_check_truncate(struct ucred *active_cred, struct ucred *file_cred,
173 struct shmfd *shmfd)
174 {
175 int error;
176
177 MAC_POLICY_CHECK_NOSLEEP(posixshm_check_truncate, active_cred,
178 file_cred, shmfd, shmfd->shm_label);
179 MAC_CHECK_PROBE3(posixshm_check_truncate, error, active_cred,
180 file_cred, shmfd);
181
182 return (error);
183 }
184
185 MAC_CHECK_PROBE_DEFINE2(posixshm_check_unlink, "struct ucred *",
186 "struct shmfd *");
187
188 int
189 mac_posixshm_check_unlink(struct ucred *cred, struct shmfd *shmfd)
190 {
191 int error;
192
193 MAC_POLICY_CHECK_NOSLEEP(posixshm_check_unlink, cred, shmfd,
194 shmfd->shm_label);
195 MAC_CHECK_PROBE2(posixshm_check_unlink, error, cred, shmfd);
196
197 return (error);
198 }
199
200 MAC_CHECK_PROBE_DEFINE3(posixshm_check_setmode, "struct ucred *",
201 "struct shmfd *", "mode_t");
202
203 int
204 mac_posixshm_check_setmode(struct ucred *cred, struct shmfd *shmfd, mode_t mode)
205 {
206 int error;
207
208 MAC_POLICY_CHECK_NOSLEEP(posixshm_check_setmode, cred, shmfd,
209 shmfd->shm_label, mode);
210 MAC_CHECK_PROBE3(posixshm_check_setmode, error, cred, shmfd, mode);
211
212 return (error);
213 }
214
215 MAC_CHECK_PROBE_DEFINE4(posixshm_check_setowner, "struct ucred *",
216 "struct shmfd *", "uid_t", "gid_t");
217
218 int
219 mac_posixshm_check_setowner(struct ucred *cred, struct shmfd *shmfd, uid_t uid,
220 gid_t gid)
221 {
222 int error;
223
224 MAC_POLICY_CHECK_NOSLEEP(posixshm_check_setowner, cred, shmfd,
225 shmfd->shm_label, uid, gid);
226 MAC_CHECK_PROBE4(posixshm_check_setowner, error, cred, shmfd,
227 uid, gid);
228
229 return (error);
230 }
231
232 MAC_CHECK_PROBE_DEFINE3(posixshm_check_read, "struct ucred *",
233 "struct ucred *", "struct shmfd *");
234
235 int
236 mac_posixshm_check_read(struct ucred *active_cred, struct ucred *file_cred,
237 struct shmfd *shmfd)
238 {
239 int error;
240
241 MAC_POLICY_CHECK_NOSLEEP(posixshm_check_read, active_cred,
242 file_cred, shmfd, shmfd->shm_label);
243 MAC_CHECK_PROBE3(posixshm_check_read, error, active_cred,
244 file_cred, shmfd);
245
246 return (error);
247 }
248
249 MAC_CHECK_PROBE_DEFINE3(posixshm_check_write, "struct ucred *",
250 "struct ucred *", "struct shmfd *");
251
252 int
253 mac_posixshm_check_write(struct ucred *active_cred, struct ucred *file_cred,
254 struct shmfd *shmfd)
255 {
256 int error;
257
258 MAC_POLICY_CHECK_NOSLEEP(posixshm_check_write, active_cred,
259 file_cred, shmfd, shmfd->shm_label);
260 MAC_CHECK_PROBE3(posixshm_check_write, error, active_cred,
261 file_cred, shmfd);
262
263 return (error);
264 }
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