1 /*-
2 * Copyright (c) 2002-2003 Networks Associates Technology, Inc.
3 * Copyright (c) 2006 SPARTA, Inc.
4 * Copyright (c) 2007, 2009 Robert N. M. Watson
5 * All rights reserved.
6 *
7 * This software was developed for the FreeBSD Project in part by Network
8 * Associates Laboratories, the Security Research Division of Network
9 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
10 * as part of the DARPA CHATS research program.
11 *
12 * Portions of this software were developed by Robert Watson for the
13 * TrustedBSD Project.
14 *
15 * This software was enhanced by SPARTA ISSO under SPAWAR contract
16 * N66001-04-C-6019 ("SEFOS").
17 *
18 * This software was developed at the University of Cambridge Computer
19 * Laboratory with support from a grant from Google, Inc.
20 *
21 * Redistribution and use in source and binary forms, with or without
22 * modification, are permitted provided that the following conditions
23 * are met:
24 * 1. Redistributions of source code must retain the above copyright
25 * notice, this list of conditions and the following disclaimer.
26 * 2. Redistributions in binary form must reproduce the above copyright
27 * notice, this list of conditions and the following disclaimer in the
28 * documentation and/or other materials provided with the distribution.
29 *
30 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
31 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
32 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
33 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
34 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
35 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
36 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
37 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
38 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
39 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
40 * SUCH DAMAGE.
41 */
42
43 /*
44 * MAC Framework entry points relating to overall operation of system,
45 * including global services such as the kernel environment and loadable
46 * modules.
47 *
48 * System checks often align with existing privilege checks, but provide
49 * additional security context that may be relevant to policies, such as the
50 * specific object being operated on.
51 */
52
53 #include <sys/cdefs.h>
54 __FBSDID("$FreeBSD: releng/11.0/sys/security/mac/mac_system.c 258541 2013-11-25 07:38:45Z attilio $");
55
56 #include "opt_mac.h"
57
58 #include <sys/param.h>
59 #include <sys/kernel.h>
60 #include <sys/lock.h>
61 #include <sys/malloc.h>
62 #include <sys/module.h>
63 #include <sys/mutex.h>
64 #include <sys/sdt.h>
65 #include <sys/systm.h>
66 #include <sys/vnode.h>
67 #include <sys/sysctl.h>
68
69 #include <security/mac/mac_framework.h>
70 #include <security/mac/mac_internal.h>
71 #include <security/mac/mac_policy.h>
72
73 MAC_CHECK_PROBE_DEFINE1(kenv_check_dump, "struct ucred *");
74
75 int
76 mac_kenv_check_dump(struct ucred *cred)
77 {
78 int error;
79
80 MAC_POLICY_CHECK_NOSLEEP(kenv_check_dump, cred);
81 MAC_CHECK_PROBE1(kenv_check_dump, error, cred);
82
83 return (error);
84 }
85
86 MAC_CHECK_PROBE_DEFINE2(kenv_check_get, "struct ucred *", "char *");
87
88 int
89 mac_kenv_check_get(struct ucred *cred, char *name)
90 {
91 int error;
92
93 MAC_POLICY_CHECK_NOSLEEP(kenv_check_get, cred, name);
94 MAC_CHECK_PROBE2(kenv_check_get, error, cred, name);
95
96 return (error);
97 }
98
99 MAC_CHECK_PROBE_DEFINE3(kenv_check_set, "struct ucred *", "char *",
100 "char *");
101
102 int
103 mac_kenv_check_set(struct ucred *cred, char *name, char *value)
104 {
105 int error;
106
107 MAC_POLICY_CHECK_NOSLEEP(kenv_check_set, cred, name, value);
108 MAC_CHECK_PROBE3(kenv_check_set, error, cred, name, value);
109
110 return (error);
111 }
112
113 MAC_CHECK_PROBE_DEFINE2(kenv_check_unset, "struct ucred *", "char *");
114
115 int
116 mac_kenv_check_unset(struct ucred *cred, char *name)
117 {
118 int error;
119
120 MAC_POLICY_CHECK_NOSLEEP(kenv_check_unset, cred, name);
121 MAC_CHECK_PROBE2(kenv_check_unset, error, cred, name);
122
123 return (error);
124 }
125
126 MAC_CHECK_PROBE_DEFINE2(kld_check_load, "struct ucred *", "struct vnode *");
127
128 int
129 mac_kld_check_load(struct ucred *cred, struct vnode *vp)
130 {
131 int error;
132
133 ASSERT_VOP_LOCKED(vp, "mac_kld_check_load");
134
135 MAC_POLICY_CHECK(kld_check_load, cred, vp, vp->v_label);
136 MAC_CHECK_PROBE2(kld_check_load, error, cred, vp);
137
138 return (error);
139 }
140
141 MAC_CHECK_PROBE_DEFINE1(kld_check_stat, "struct ucred *");
142
143 int
144 mac_kld_check_stat(struct ucred *cred)
145 {
146 int error;
147
148 MAC_POLICY_CHECK_NOSLEEP(kld_check_stat, cred);
149 MAC_CHECK_PROBE1(kld_check_stat, error, cred);
150
151 return (error);
152 }
153
154 MAC_CHECK_PROBE_DEFINE2(system_check_acct, "struct ucred *",
155 "struct vnode *");
156
157 int
158 mac_system_check_acct(struct ucred *cred, struct vnode *vp)
159 {
160 int error;
161
162 if (vp != NULL) {
163 ASSERT_VOP_LOCKED(vp, "mac_system_check_acct");
164 }
165
166 MAC_POLICY_CHECK(system_check_acct, cred, vp,
167 vp != NULL ? vp->v_label : NULL);
168 MAC_CHECK_PROBE2(system_check_acct, error, cred, vp);
169
170 return (error);
171 }
172
173 MAC_CHECK_PROBE_DEFINE2(system_check_reboot, "struct ucred *", "int");
174
175 int
176 mac_system_check_reboot(struct ucred *cred, int howto)
177 {
178 int error;
179
180 MAC_POLICY_CHECK_NOSLEEP(system_check_reboot, cred, howto);
181 MAC_CHECK_PROBE2(system_check_reboot, error, cred, howto);
182
183 return (error);
184 }
185
186 MAC_CHECK_PROBE_DEFINE2(system_check_swapon, "struct ucred *",
187 "struct vnode *");
188
189 int
190 mac_system_check_swapon(struct ucred *cred, struct vnode *vp)
191 {
192 int error;
193
194 ASSERT_VOP_LOCKED(vp, "mac_system_check_swapon");
195
196 MAC_POLICY_CHECK(system_check_swapon, cred, vp, vp->v_label);
197 MAC_CHECK_PROBE2(system_check_swapon, error, cred, vp);
198
199 return (error);
200 }
201
202 MAC_CHECK_PROBE_DEFINE2(system_check_swapoff, "struct ucred *",
203 "struct vnode *");
204
205 int
206 mac_system_check_swapoff(struct ucred *cred, struct vnode *vp)
207 {
208 int error;
209
210 ASSERT_VOP_LOCKED(vp, "mac_system_check_swapoff");
211
212 MAC_POLICY_CHECK(system_check_swapoff, cred, vp, vp->v_label);
213 MAC_CHECK_PROBE2(system_check_swapoff, error, cred, vp);
214
215 return (error);
216 }
217
218 MAC_CHECK_PROBE_DEFINE3(system_check_sysctl, "struct ucred *",
219 "struct sysctl_oid *", "struct sysctl_req *");
220
221 int
222 mac_system_check_sysctl(struct ucred *cred, struct sysctl_oid *oidp,
223 void *arg1, int arg2, struct sysctl_req *req)
224 {
225 int error;
226
227 /*
228 * XXXMAC: We would very much like to assert the SYSCTL_LOCK here,
229 * but since it's not exported from kern_sysctl.c, we can't.
230 */
231 MAC_POLICY_CHECK_NOSLEEP(system_check_sysctl, cred, oidp, arg1, arg2,
232 req);
233 MAC_CHECK_PROBE3(system_check_sysctl, error, cred, oidp, req);
234
235 return (error);
236 }
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