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("$FreeBSD$");
55
56 #include "opt_kdtrace.h"
57 #include "opt_mac.h"
58
59 #include <sys/param.h>
60 #include <sys/kernel.h>
61 #include <sys/lock.h>
62 #include <sys/malloc.h>
63 #include <sys/module.h>
64 #include <sys/mutex.h>
65 #include <sys/sdt.h>
66 #include <sys/systm.h>
67 #include <sys/vnode.h>
68 #include <sys/sysctl.h>
69
70 #include <security/mac/mac_framework.h>
71 #include <security/mac/mac_internal.h>
72 #include <security/mac/mac_policy.h>
73
74 MAC_CHECK_PROBE_DEFINE1(kenv_check_dump, "struct ucred *");
75
76 int
77 mac_kenv_check_dump(struct ucred *cred)
78 {
79 int error;
80
81 MAC_POLICY_CHECK_NOSLEEP(kenv_check_dump, cred);
82 MAC_CHECK_PROBE1(kenv_check_dump, error, cred);
83
84 return (error);
85 }
86
87 MAC_CHECK_PROBE_DEFINE2(kenv_check_get, "struct ucred *", "char *");
88
89 int
90 mac_kenv_check_get(struct ucred *cred, char *name)
91 {
92 int error;
93
94 MAC_POLICY_CHECK_NOSLEEP(kenv_check_get, cred, name);
95 MAC_CHECK_PROBE2(kenv_check_get, error, cred, name);
96
97 return (error);
98 }
99
100 MAC_CHECK_PROBE_DEFINE3(kenv_check_set, "struct ucred *", "char *",
101 "char *");
102
103 int
104 mac_kenv_check_set(struct ucred *cred, char *name, char *value)
105 {
106 int error;
107
108 MAC_POLICY_CHECK_NOSLEEP(kenv_check_set, cred, name, value);
109 MAC_CHECK_PROBE3(kenv_check_set, error, cred, name, value);
110
111 return (error);
112 }
113
114 MAC_CHECK_PROBE_DEFINE2(kenv_check_unset, "struct ucred *", "char *");
115
116 int
117 mac_kenv_check_unset(struct ucred *cred, char *name)
118 {
119 int error;
120
121 MAC_POLICY_CHECK_NOSLEEP(kenv_check_unset, cred, name);
122 MAC_CHECK_PROBE2(kenv_check_unset, error, cred, name);
123
124 return (error);
125 }
126
127 MAC_CHECK_PROBE_DEFINE2(kld_check_load, "struct ucred *", "struct vnode *");
128
129 int
130 mac_kld_check_load(struct ucred *cred, struct vnode *vp)
131 {
132 int error;
133
134 ASSERT_VOP_LOCKED(vp, "mac_kld_check_load");
135
136 MAC_POLICY_CHECK(kld_check_load, cred, vp, vp->v_label);
137 MAC_CHECK_PROBE2(kld_check_load, error, cred, vp);
138
139 return (error);
140 }
141
142 MAC_CHECK_PROBE_DEFINE1(kld_check_stat, "struct ucred *");
143
144 int
145 mac_kld_check_stat(struct ucred *cred)
146 {
147 int error;
148
149 MAC_POLICY_CHECK_NOSLEEP(kld_check_stat, cred);
150 MAC_CHECK_PROBE1(kld_check_stat, error, cred);
151
152 return (error);
153 }
154
155 MAC_CHECK_PROBE_DEFINE2(system_check_acct, "struct ucred *",
156 "struct vnode *");
157
158 int
159 mac_system_check_acct(struct ucred *cred, struct vnode *vp)
160 {
161 int error;
162
163 if (vp != NULL) {
164 ASSERT_VOP_LOCKED(vp, "mac_system_check_acct");
165 }
166
167 MAC_POLICY_CHECK(system_check_acct, cred, vp,
168 vp != NULL ? vp->v_label : NULL);
169 MAC_CHECK_PROBE2(system_check_acct, error, cred, vp);
170
171 return (error);
172 }
173
174 MAC_CHECK_PROBE_DEFINE2(system_check_reboot, "struct ucred *", "int");
175
176 int
177 mac_system_check_reboot(struct ucred *cred, int howto)
178 {
179 int error;
180
181 MAC_POLICY_CHECK_NOSLEEP(system_check_reboot, cred, howto);
182 MAC_CHECK_PROBE2(system_check_reboot, error, cred, howto);
183
184 return (error);
185 }
186
187 MAC_CHECK_PROBE_DEFINE2(system_check_swapon, "struct ucred *",
188 "struct vnode *");
189
190 int
191 mac_system_check_swapon(struct ucred *cred, struct vnode *vp)
192 {
193 int error;
194
195 ASSERT_VOP_LOCKED(vp, "mac_system_check_swapon");
196
197 MAC_POLICY_CHECK(system_check_swapon, cred, vp, vp->v_label);
198 MAC_CHECK_PROBE2(system_check_swapon, error, cred, vp);
199
200 return (error);
201 }
202
203 MAC_CHECK_PROBE_DEFINE2(system_check_swapoff, "struct ucred *",
204 "struct vnode *");
205
206 int
207 mac_system_check_swapoff(struct ucred *cred, struct vnode *vp)
208 {
209 int error;
210
211 ASSERT_VOP_LOCKED(vp, "mac_system_check_swapoff");
212
213 MAC_POLICY_CHECK(system_check_swapoff, cred, vp, vp->v_label);
214 MAC_CHECK_PROBE2(system_check_swapoff, error, cred, vp);
215
216 return (error);
217 }
218
219 MAC_CHECK_PROBE_DEFINE3(system_check_sysctl, "struct ucred *",
220 "struct sysctl_oid *", "struct sysctl_req *");
221
222 int
223 mac_system_check_sysctl(struct ucred *cred, struct sysctl_oid *oidp,
224 void *arg1, int arg2, struct sysctl_req *req)
225 {
226 int error;
227
228 /*
229 * XXXMAC: We would very much like to assert the SYSCTL_LOCK here,
230 * but since it's not exported from kern_sysctl.c, we can't.
231 */
232 MAC_POLICY_CHECK_NOSLEEP(system_check_sysctl, cred, oidp, arg1, arg2,
233 req);
234 MAC_CHECK_PROBE3(system_check_sysctl, error, cred, oidp, req);
235
236 return (error);
237 }
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