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
58 static struct label *
59 mac_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
68 void
69 mac_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
78 static void
79 mac_posixsem_label_free(struct label *label)
80 {
81
82 MAC_POLICY_PERFORM_NOSLEEP(posixsem_destroy_label, label);
83 mac_labelzone_free(label);
84 }
85
86 void
87 mac_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
96 void
97 mac_posixsem_create(struct ucred *cred, struct ksem *ks)
98 {
99
100 MAC_POLICY_PERFORM_NOSLEEP(posixsem_create, cred, ks, ks->ks_label);
101 }
102
103 MAC_CHECK_PROBE_DEFINE2(posixsem_check_open, "struct ucred *",
104 "struct ksem *");
105
106 int
107 mac_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
118 MAC_CHECK_PROBE_DEFINE3(posixsem_check_getvalue, "struct ucred *",
119 "struct ucred *", "struct ksem *");
120
121 int
122 mac_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
135 MAC_CHECK_PROBE_DEFINE3(posixsem_check_post, "struct ucred *",
136 "struct ucred *", "struct ksem *");
137
138 int
139 mac_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
152 MAC_CHECK_PROBE_DEFINE3(posixsem_check_stat, "struct ucred *",
153 "struct ucred *", "struct ksem *");
154
155 int
156 mac_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
169 MAC_CHECK_PROBE_DEFINE2(posixsem_check_unlink, "struct ucred *",
170 "struct ksem *");
171
172 int
173 mac_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
184 MAC_CHECK_PROBE_DEFINE3(posixsem_check_wait, "struct ucred *",
185 "struct ucred *", "struct ksem *");
186
187 int
188 mac_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
201 MAC_CHECK_PROBE_DEFINE3(posixsem_check_setmode, "struct ucred *",
202 "struct ksem *", "mode_t");
203
204 int
205 mac_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
216 MAC_CHECK_PROBE_DEFINE4(posixsem_check_setowner, "struct ucred *",
217 "struct ks *", "uid_t", "gid_t");
218
219 int
220 mac_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 }
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