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
57static struct label *
58mac_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
67void
68mac_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
77static void
78mac_posixshm_label_free(struct label *label)
79{
80
81	MAC_POLICY_PERFORM_NOSLEEP(posixshm_destroy_label, label);
82	mac_labelzone_free(label);
83}
84
85void
86mac_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
95void
96mac_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
103MAC_CHECK_PROBE_DEFINE2(posixshm_check_create, "struct ucred *",
104    "const char *");
105
106int
107mac_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
117MAC_CHECK_PROBE_DEFINE4(posixshm_check_mmap, "struct ucred *",
118    "struct shmfd *", "int", "int");
119
120int
121mac_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
134MAC_CHECK_PROBE_DEFINE3(posixshm_check_open, "struct ucred *",
135    "struct shmfd *", "accmode_t");
136
137int
138mac_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
150MAC_CHECK_PROBE_DEFINE3(posixshm_check_stat, "struct ucred *",
151    "struct ucred *", "struct shmfd *");
152
153int
154mac_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
167MAC_CHECK_PROBE_DEFINE3(posixshm_check_truncate, "struct ucred *",
168    "struct ucred *", "struct shmfd *");
169
170int
171mac_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
184MAC_CHECK_PROBE_DEFINE2(posixshm_check_unlink, "struct ucred *",
185    "struct shmfd *");
186
187int
188mac_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
199MAC_CHECK_PROBE_DEFINE3(posixshm_check_setmode, "struct ucred *",
200    "struct shmfd *", "mode_t");
201
202int
203mac_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
214MAC_CHECK_PROBE_DEFINE4(posixshm_check_setowner, "struct ucred *",
215    "struct shmfd *", "uid_t", "gid_t");
216
217int
218mac_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
231MAC_CHECK_PROBE_DEFINE3(posixshm_check_read, "struct ucred *",
232    "struct ucred *", "struct shmfd *");
233
234int
235mac_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
248MAC_CHECK_PROBE_DEFINE3(posixshm_check_write, "struct ucred *",
249    "struct ucred *", "struct shmfd *");
250
251int
252mac_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}
264