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