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_mac.h"
43
44 #include <sys/param.h>
45 #include <sys/kernel.h>
46 #include <sys/mman.h>
47 #include <sys/malloc.h>
48 #include <sys/module.h>
49 #include <sys/sdt.h>
50 #include <sys/systm.h>
51 #include <sys/sysctl.h>
52
53 #include <security/mac/mac_framework.h>
54 #include <security/mac/mac_internal.h>
55 #include <security/mac/mac_policy.h>
56
57 static struct label *
58 mac_posixshm_label_alloc(void)
59 {
60 struct label *label;
61
62 label = mac_labelzone_alloc(M_WAITOK);
63 MAC_POLICY_PERFORM(posixshm_init_label, label);
64 return (label);
65 }
66
67 void
68 mac_posixshm_init(struct shmfd *shmfd)
69 {
70
71 if (mac_labeled & MPC_OBJECT_POSIXSHM)
72 shmfd->shm_label = mac_posixshm_label_alloc();
73 else
74 shmfd->shm_label = NULL;
75 }
76
77 static void
78 mac_posixshm_label_free(struct label *label)
79 {
80
81 MAC_POLICY_PERFORM_NOSLEEP(posixshm_destroy_label, label);
82 mac_labelzone_free(label);
83 }
84
85 void
86 mac_posixshm_destroy(struct shmfd *shmfd)
87 {
88
89 if (shmfd->shm_label != NULL) {
90 mac_posixshm_label_free(shmfd->shm_label);
91 shmfd->shm_label = NULL;
92 }
93 }
94
95 void
96 mac_posixshm_create(struct ucred *cred, struct shmfd *shmfd)
97 {
98
99 MAC_POLICY_PERFORM_NOSLEEP(posixshm_create, cred, shmfd,
100 shmfd->shm_label);
101 }
102
103 MAC_CHECK_PROBE_DEFINE2(posixshm_check_create, "struct ucred *",
104 "const char *");
105
106 int
107 mac_posixshm_check_create(struct ucred *cred, const char *path)
108 {
109 int error;
110
111 MAC_POLICY_CHECK_NOSLEEP(posixshm_check_create, cred, path);
112 MAC_CHECK_PROBE2(posixshm_check_create, error, cred, path);
113
114 return (error);
115 }
116
117 MAC_CHECK_PROBE_DEFINE4(posixshm_check_mmap, "struct ucred *",
118 "struct shmfd *", "int", "int");
119
120 int
121 mac_posixshm_check_mmap(struct ucred *cred, struct shmfd *shmfd, int prot,
122 int flags)
123 {
124 int error;
125
126 MAC_POLICY_CHECK_NOSLEEP(posixshm_check_mmap, cred, shmfd,
127 shmfd->shm_label, prot, flags);
128 MAC_CHECK_PROBE4(posixshm_check_mmap, error, cred, shmfd, prot,
129 flags);
130
131 return (error);
132 }
133
134 MAC_CHECK_PROBE_DEFINE3(posixshm_check_open, "struct ucred *",
135 "struct shmfd *", "accmode_t");
136
137 int
138 mac_posixshm_check_open(struct ucred *cred, struct shmfd *shmfd,
139 accmode_t accmode)
140 {
141 int error;
142
143 MAC_POLICY_CHECK_NOSLEEP(posixshm_check_open, cred, shmfd,
144 shmfd->shm_label, accmode);
145 MAC_CHECK_PROBE3(posixshm_check_open, error, cred, shmfd, accmode);
146
147 return (error);
148 }
149
150 MAC_CHECK_PROBE_DEFINE3(posixshm_check_stat, "struct ucred *",
151 "struct ucred *", "struct shmfd *");
152
153 int
154 mac_posixshm_check_stat(struct ucred *active_cred, struct ucred *file_cred,
155 struct shmfd *shmfd)
156 {
157 int error;
158
159 MAC_POLICY_CHECK_NOSLEEP(posixshm_check_stat, active_cred, file_cred,
160 shmfd, shmfd->shm_label);
161 MAC_CHECK_PROBE3(posixshm_check_stat, error, active_cred, file_cred,
162 shmfd);
163
164 return (error);
165 }
166
167 MAC_CHECK_PROBE_DEFINE3(posixshm_check_truncate, "struct ucred *",
168 "struct ucred *", "struct shmfd *");
169
170 int
171 mac_posixshm_check_truncate(struct ucred *active_cred, struct ucred *file_cred,
172 struct shmfd *shmfd)
173 {
174 int error;
175
176 MAC_POLICY_CHECK_NOSLEEP(posixshm_check_truncate, active_cred,
177 file_cred, shmfd, shmfd->shm_label);
178 MAC_CHECK_PROBE3(posixshm_check_truncate, error, active_cred,
179 file_cred, shmfd);
180
181 return (error);
182 }
183
184 MAC_CHECK_PROBE_DEFINE2(posixshm_check_unlink, "struct ucred *",
185 "struct shmfd *");
186
187 int
188 mac_posixshm_check_unlink(struct ucred *cred, struct shmfd *shmfd)
189 {
190 int error;
191
192 MAC_POLICY_CHECK_NOSLEEP(posixshm_check_unlink, cred, shmfd,
193 shmfd->shm_label);
194 MAC_CHECK_PROBE2(posixshm_check_unlink, error, cred, shmfd);
195
196 return (error);
197 }
198
199 MAC_CHECK_PROBE_DEFINE3(posixshm_check_setmode, "struct ucred *",
200 "struct shmfd *", "mode_t");
201
202 int
203 mac_posixshm_check_setmode(struct ucred *cred, struct shmfd *shmfd, mode_t mode)
204 {
205 int error;
206
207 MAC_POLICY_CHECK_NOSLEEP(posixshm_check_setmode, cred, shmfd,
208 shmfd->shm_label, mode);
209 MAC_CHECK_PROBE3(posixshm_check_setmode, error, cred, shmfd, mode);
210
211 return (error);
212 }
213
214 MAC_CHECK_PROBE_DEFINE4(posixshm_check_setowner, "struct ucred *",
215 "struct shmfd *", "uid_t", "gid_t");
216
217 int
218 mac_posixshm_check_setowner(struct ucred *cred, struct shmfd *shmfd, uid_t uid,
219 gid_t gid)
220 {
221 int error;
222
223 MAC_POLICY_CHECK_NOSLEEP(posixshm_check_setowner, cred, shmfd,
224 shmfd->shm_label, uid, gid);
225 MAC_CHECK_PROBE4(posixshm_check_setowner, error, cred, shmfd,
226 uid, gid);
227
228 return (error);
229 }
230
231 MAC_CHECK_PROBE_DEFINE3(posixshm_check_read, "struct ucred *",
232 "struct ucred *", "struct shmfd *");
233
234 int
235 mac_posixshm_check_read(struct ucred *active_cred, struct ucred *file_cred,
236 struct shmfd *shmfd)
237 {
238 int error;
239
240 MAC_POLICY_CHECK_NOSLEEP(posixshm_check_read, active_cred,
241 file_cred, shmfd, shmfd->shm_label);
242 MAC_CHECK_PROBE3(posixshm_check_read, error, active_cred,
243 file_cred, shmfd);
244
245 return (error);
246 }
247
248 MAC_CHECK_PROBE_DEFINE3(posixshm_check_write, "struct ucred *",
249 "struct ucred *", "struct shmfd *");
250
251 int
252 mac_posixshm_check_write(struct ucred *active_cred, struct ucred *file_cred,
253 struct shmfd *shmfd)
254 {
255 int error;
256
257 MAC_POLICY_CHECK_NOSLEEP(posixshm_check_write, active_cred,
258 file_cred, shmfd, shmfd->shm_label);
259 MAC_CHECK_PROBE3(posixshm_check_write, error, active_cred,
260 file_cred, shmfd);
261
262 return (error);
263 }
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