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_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
73MAC_CHECK_PROBE_DEFINE1(kenv_check_dump, "struct ucred *");
74
75int
76mac_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
86MAC_CHECK_PROBE_DEFINE2(kenv_check_get, "struct ucred *", "char *");
87
88int
89mac_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
99MAC_CHECK_PROBE_DEFINE3(kenv_check_set, "struct ucred *", "char *",
100    "char *");
101
102int
103mac_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
113MAC_CHECK_PROBE_DEFINE2(kenv_check_unset, "struct ucred *", "char *");
114
115int
116mac_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
126MAC_CHECK_PROBE_DEFINE2(kld_check_load, "struct ucred *", "struct vnode *");
127
128int
129mac_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
141MAC_CHECK_PROBE_DEFINE1(kld_check_stat, "struct ucred *");
142
143int
144mac_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
154MAC_CHECK_PROBE_DEFINE2(system_check_acct, "struct ucred *",
155    "struct vnode *");
156
157int
158mac_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
173MAC_CHECK_PROBE_DEFINE2(system_check_reboot, "struct ucred *", "int");
174
175int
176mac_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
186MAC_CHECK_PROBE_DEFINE2(system_check_swapon, "struct ucred *",
187    "struct vnode *");
188
189int
190mac_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
202MAC_CHECK_PROBE_DEFINE2(system_check_swapoff, "struct ucred *",
203    "struct vnode *");
204
205int
206mac_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
218MAC_CHECK_PROBE_DEFINE3(system_check_sysctl, "struct ucred *",
219    "struct sysctl_oid *", "struct sysctl_req *");
220
221int
222mac_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}
237