1/*-
2 * Copyright (c) 2003-2006 SPARTA, Inc.
3 * Copyright (c) 2009 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#include "opt_posix.h"
44
45#include <sys/param.h>
46#include <sys/kernel.h>
47#include <sys/ksem.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
58static struct label *
59mac_posixsem_label_alloc(void)
60{
61	struct label *label;
62
63	label = mac_labelzone_alloc(M_WAITOK);
64	MAC_POLICY_PERFORM(posixsem_init_label, label);
65	return (label);
66}
67
68void
69mac_posixsem_init(struct ksem *ks)
70{
71
72	if (mac_labeled & MPC_OBJECT_POSIXSEM)
73		ks->ks_label = mac_posixsem_label_alloc();
74	else
75		ks->ks_label = NULL;
76}
77
78static void
79mac_posixsem_label_free(struct label *label)
80{
81
82	MAC_POLICY_PERFORM_NOSLEEP(posixsem_destroy_label, label);
83	mac_labelzone_free(label);
84}
85
86void
87mac_posixsem_destroy(struct ksem *ks)
88{
89
90	if (ks->ks_label != NULL) {
91		mac_posixsem_label_free(ks->ks_label);
92		ks->ks_label = NULL;
93	}
94}
95
96void
97mac_posixsem_create(struct ucred *cred, struct ksem *ks)
98{
99
100	MAC_POLICY_PERFORM_NOSLEEP(posixsem_create, cred, ks, ks->ks_label);
101}
102
103MAC_CHECK_PROBE_DEFINE2(posixsem_check_open, "struct ucred *",
104    "struct ksem *");
105
106int
107mac_posixsem_check_open(struct ucred *cred, struct ksem *ks)
108{
109	int error;
110
111	MAC_POLICY_CHECK_NOSLEEP(posixsem_check_open, cred, ks,
112	    ks->ks_label);
113	MAC_CHECK_PROBE2(posixsem_check_open, error, cred, ks);
114
115	return (error);
116}
117
118MAC_CHECK_PROBE_DEFINE3(posixsem_check_getvalue, "struct ucred *",
119    "struct ucred *", "struct ksem *");
120
121int
122mac_posixsem_check_getvalue(struct ucred *active_cred, struct ucred *file_cred,
123    struct ksem *ks)
124{
125	int error;
126
127	MAC_POLICY_CHECK_NOSLEEP(posixsem_check_getvalue, active_cred,
128	    file_cred, ks, ks->ks_label);
129	MAC_CHECK_PROBE3(posixsem_check_getvalue, error, active_cred,
130	    file_cred, ks);
131
132	return (error);
133}
134
135MAC_CHECK_PROBE_DEFINE3(posixsem_check_post, "struct ucred *",
136    "struct ucred *", "struct ksem *");
137
138int
139mac_posixsem_check_post(struct ucred *active_cred, struct ucred *file_cred,
140    struct ksem *ks)
141{
142	int error;
143
144	MAC_POLICY_CHECK_NOSLEEP(posixsem_check_post, active_cred, file_cred,
145	    ks, ks->ks_label);
146	MAC_CHECK_PROBE3(posixsem_check_post, error, active_cred, file_cred,
147	    ks);
148
149	return (error);
150}
151
152MAC_CHECK_PROBE_DEFINE3(posixsem_check_stat, "struct ucred *",
153    "struct ucred *", "struct ksem *");
154
155int
156mac_posixsem_check_stat(struct ucred *active_cred, struct ucred *file_cred,
157    struct ksem *ks)
158{
159	int error;
160
161	MAC_POLICY_CHECK_NOSLEEP(posixsem_check_stat, active_cred, file_cred,
162	    ks, ks->ks_label);
163	MAC_CHECK_PROBE3(posixsem_check_stat, error, active_cred, file_cred,
164	    ks);
165
166	return (error);
167}
168
169MAC_CHECK_PROBE_DEFINE2(posixsem_check_unlink, "struct ucred *",
170    "struct ksem *");
171
172int
173mac_posixsem_check_unlink(struct ucred *cred, struct ksem *ks)
174{
175	int error;
176
177	MAC_POLICY_CHECK_NOSLEEP(posixsem_check_unlink, cred, ks,
178	    ks->ks_label);
179	MAC_CHECK_PROBE2(posixsem_check_unlink, error, cred, ks);
180
181	return (error);
182}
183
184MAC_CHECK_PROBE_DEFINE3(posixsem_check_wait, "struct ucred *",
185    "struct ucred *", "struct ksem *");
186
187int
188mac_posixsem_check_wait(struct ucred *active_cred, struct ucred *file_cred,
189    struct ksem *ks)
190{
191	int error;
192
193	MAC_POLICY_CHECK_NOSLEEP(posixsem_check_wait, active_cred, file_cred,
194	    ks, ks->ks_label);
195	MAC_CHECK_PROBE3(posixsem_check_wait, error, active_cred, file_cred,
196	    ks);
197
198	return (error);
199}
200
201MAC_CHECK_PROBE_DEFINE3(posixsem_check_setmode, "struct ucred *",
202    "struct ksem *", "mode_t");
203
204int
205mac_posixsem_check_setmode(struct ucred *cred, struct ksem *ks, mode_t mode)
206{
207	int error;
208
209	MAC_POLICY_CHECK_NOSLEEP(posixsem_check_setmode, cred, ks,
210	    ks->ks_label, mode);
211	MAC_CHECK_PROBE3(posixsem_check_setmode, error, cred, ks, mode);
212
213	return (error);
214}
215
216MAC_CHECK_PROBE_DEFINE4(posixsem_check_setowner, "struct ucred *",
217    "struct ks *", "uid_t", "gid_t");
218
219int
220mac_posixsem_check_setowner(struct ucred *cred, struct ksem *ks, uid_t uid,
221    gid_t gid)
222{
223	int error;
224
225	MAC_POLICY_CHECK_NOSLEEP(posixsem_check_setowner, cred, ks,
226	    ks->ks_label, uid, gid);
227	MAC_CHECK_PROBE4(posixsem_check_setowner, error, cred, ks,
228	    uid, gid);
229
230	return (error);
231}
232