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 #include "opt_mac.h"
41
42 #include <sys/param.h>
43 #include <sys/kernel.h>
44 #include <sys/mman.h>
45 #include <sys/malloc.h>
46 #include <sys/module.h>
47 #include <sys/sdt.h>
48 #include <sys/systm.h>
49 #include <sys/sysctl.h>
50
51 #include <security/mac/mac_framework.h>
52 #include <security/mac/mac_internal.h>
53 #include <security/mac/mac_policy.h>
54
55 static struct label *
mac_posixshm_label_alloc(void)56 mac_posixshm_label_alloc(void)
57 {
58 struct label *label;
59
60 label = mac_labelzone_alloc(M_WAITOK);
61 MAC_POLICY_PERFORM(posixshm_init_label, label);
62 return (label);
63 }
64
65 void
mac_posixshm_init(struct shmfd * shmfd)66 mac_posixshm_init(struct shmfd *shmfd)
67 {
68
69 if (mac_labeled & MPC_OBJECT_POSIXSHM)
70 shmfd->shm_label = mac_posixshm_label_alloc();
71 else
72 shmfd->shm_label = NULL;
73 }
74
75 static void
mac_posixshm_label_free(struct label * label)76 mac_posixshm_label_free(struct label *label)
77 {
78
79 MAC_POLICY_PERFORM_NOSLEEP(posixshm_destroy_label, label);
80 mac_labelzone_free(label);
81 }
82
83 void
mac_posixshm_destroy(struct shmfd * shmfd)84 mac_posixshm_destroy(struct shmfd *shmfd)
85 {
86
87 if (shmfd->shm_label != NULL) {
88 mac_posixshm_label_free(shmfd->shm_label);
89 shmfd->shm_label = NULL;
90 }
91 }
92
93 void
mac_posixshm_create(struct ucred * cred,struct shmfd * shmfd)94 mac_posixshm_create(struct ucred *cred, struct shmfd *shmfd)
95 {
96
97 MAC_POLICY_PERFORM_NOSLEEP(posixshm_create, cred, shmfd,
98 shmfd->shm_label);
99 }
100
101 MAC_CHECK_PROBE_DEFINE2(posixshm_check_create, "struct ucred *",
102 "const char *");
103
104 int
mac_posixshm_check_create(struct ucred * cred,const char * path)105 mac_posixshm_check_create(struct ucred *cred, const char *path)
106 {
107 int error;
108
109 MAC_POLICY_CHECK_NOSLEEP(posixshm_check_create, cred, path);
110 MAC_CHECK_PROBE2(posixshm_check_create, error, cred, path);
111
112 return (error);
113 }
114
115 MAC_CHECK_PROBE_DEFINE4(posixshm_check_mmap, "struct ucred *",
116 "struct shmfd *", "int", "int");
117
118 int
mac_posixshm_check_mmap(struct ucred * cred,struct shmfd * shmfd,int prot,int flags)119 mac_posixshm_check_mmap(struct ucred *cred, struct shmfd *shmfd, int prot,
120 int flags)
121 {
122 int error;
123
124 MAC_POLICY_CHECK_NOSLEEP(posixshm_check_mmap, cred, shmfd,
125 shmfd->shm_label, prot, flags);
126 MAC_CHECK_PROBE4(posixshm_check_mmap, error, cred, shmfd, prot,
127 flags);
128
129 return (error);
130 }
131
132 MAC_CHECK_PROBE_DEFINE3(posixshm_check_open, "struct ucred *",
133 "struct shmfd *", "accmode_t");
134
135 int
mac_posixshm_check_open(struct ucred * cred,struct shmfd * shmfd,accmode_t accmode)136 mac_posixshm_check_open(struct ucred *cred, struct shmfd *shmfd,
137 accmode_t accmode)
138 {
139 int error;
140
141 MAC_POLICY_CHECK_NOSLEEP(posixshm_check_open, cred, shmfd,
142 shmfd->shm_label, accmode);
143 MAC_CHECK_PROBE3(posixshm_check_open, error, cred, shmfd, accmode);
144
145 return (error);
146 }
147
148 MAC_CHECK_PROBE_DEFINE3(posixshm_check_stat, "struct ucred *",
149 "struct ucred *", "struct shmfd *");
150
151 int
mac_posixshm_check_stat(struct ucred * active_cred,struct ucred * file_cred,struct shmfd * shmfd)152 mac_posixshm_check_stat(struct ucred *active_cred, struct ucred *file_cred,
153 struct shmfd *shmfd)
154 {
155 int error;
156
157 MAC_POLICY_CHECK_NOSLEEP(posixshm_check_stat, active_cred, file_cred,
158 shmfd, shmfd->shm_label);
159 MAC_CHECK_PROBE3(posixshm_check_stat, error, active_cred, file_cred,
160 shmfd);
161
162 return (error);
163 }
164
165 MAC_CHECK_PROBE_DEFINE3(posixshm_check_truncate, "struct ucred *",
166 "struct ucred *", "struct shmfd *");
167
168 int
mac_posixshm_check_truncate(struct ucred * active_cred,struct ucred * file_cred,struct shmfd * shmfd)169 mac_posixshm_check_truncate(struct ucred *active_cred, struct ucred *file_cred,
170 struct shmfd *shmfd)
171 {
172 int error;
173
174 MAC_POLICY_CHECK_NOSLEEP(posixshm_check_truncate, active_cred,
175 file_cred, shmfd, shmfd->shm_label);
176 MAC_CHECK_PROBE3(posixshm_check_truncate, error, active_cred,
177 file_cred, shmfd);
178
179 return (error);
180 }
181
182 MAC_CHECK_PROBE_DEFINE2(posixshm_check_unlink, "struct ucred *",
183 "struct shmfd *");
184
185 int
mac_posixshm_check_unlink(struct ucred * cred,struct shmfd * shmfd)186 mac_posixshm_check_unlink(struct ucred *cred, struct shmfd *shmfd)
187 {
188 int error;
189
190 MAC_POLICY_CHECK_NOSLEEP(posixshm_check_unlink, cred, shmfd,
191 shmfd->shm_label);
192 MAC_CHECK_PROBE2(posixshm_check_unlink, error, cred, shmfd);
193
194 return (error);
195 }
196
197 MAC_CHECK_PROBE_DEFINE3(posixshm_check_setmode, "struct ucred *",
198 "struct shmfd *", "mode_t");
199
200 int
mac_posixshm_check_setmode(struct ucred * cred,struct shmfd * shmfd,mode_t mode)201 mac_posixshm_check_setmode(struct ucred *cred, struct shmfd *shmfd, mode_t mode)
202 {
203 int error;
204
205 MAC_POLICY_CHECK_NOSLEEP(posixshm_check_setmode, cred, shmfd,
206 shmfd->shm_label, mode);
207 MAC_CHECK_PROBE3(posixshm_check_setmode, error, cred, shmfd, mode);
208
209 return (error);
210 }
211
212 MAC_CHECK_PROBE_DEFINE4(posixshm_check_setowner, "struct ucred *",
213 "struct shmfd *", "uid_t", "gid_t");
214
215 int
mac_posixshm_check_setowner(struct ucred * cred,struct shmfd * shmfd,uid_t uid,gid_t gid)216 mac_posixshm_check_setowner(struct ucred *cred, struct shmfd *shmfd, uid_t uid,
217 gid_t gid)
218 {
219 int error;
220
221 MAC_POLICY_CHECK_NOSLEEP(posixshm_check_setowner, cred, shmfd,
222 shmfd->shm_label, uid, gid);
223 MAC_CHECK_PROBE4(posixshm_check_setowner, error, cred, shmfd,
224 uid, gid);
225
226 return (error);
227 }
228
229 MAC_CHECK_PROBE_DEFINE3(posixshm_check_read, "struct ucred *",
230 "struct ucred *", "struct shmfd *");
231
232 int
mac_posixshm_check_read(struct ucred * active_cred,struct ucred * file_cred,struct shmfd * shmfd)233 mac_posixshm_check_read(struct ucred *active_cred, struct ucred *file_cred,
234 struct shmfd *shmfd)
235 {
236 int error;
237
238 MAC_POLICY_CHECK_NOSLEEP(posixshm_check_read, active_cred,
239 file_cred, shmfd, shmfd->shm_label);
240 MAC_CHECK_PROBE3(posixshm_check_read, error, active_cred,
241 file_cred, shmfd);
242
243 return (error);
244 }
245
246 MAC_CHECK_PROBE_DEFINE3(posixshm_check_write, "struct ucred *",
247 "struct ucred *", "struct shmfd *");
248
249 int
mac_posixshm_check_write(struct ucred * active_cred,struct ucred * file_cred,struct shmfd * shmfd)250 mac_posixshm_check_write(struct ucred *active_cred, struct ucred *file_cred,
251 struct shmfd *shmfd)
252 {
253 int error;
254
255 MAC_POLICY_CHECK_NOSLEEP(posixshm_check_write, active_cred,
256 file_cred, shmfd, shmfd->shm_label);
257 MAC_CHECK_PROBE3(posixshm_check_write, error, active_cred,
258 file_cred, shmfd);
259
260 return (error);
261 }
262