1/*-
2 * Copyright (c) 1999-2002, 2007 Robert N. M. Watson
3 * Copyright (c) 2001-2002 Networks Associates Technology, Inc.
4 * Copyright (c) 2006 SPARTA, Inc.
5 * All rights reserved.
6 *
7 * This software was developed by Robert Watson for the TrustedBSD Project.
8 *
9 * This software was developed for the FreeBSD Project in part by Network
10 * Associates Laboratories, the Security Research Division of Network
11 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
12 * as part of the DARPA CHATS research program.
13 *
14 * This software was enhanced by SPARTA ISSO under SPAWAR contract
15 * N66001-04-C-6019 ("SEFOS").
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 *
| 1/*-
2 * Copyright (c) 1999-2002, 2007 Robert N. M. Watson
3 * Copyright (c) 2001-2002 Networks Associates Technology, Inc.
4 * Copyright (c) 2006 SPARTA, Inc.
5 * All rights reserved.
6 *
7 * This software was developed by Robert Watson for the TrustedBSD Project.
8 *
9 * This software was developed for the FreeBSD Project in part by Network
10 * Associates Laboratories, the Security Research Division of Network
11 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
12 * as part of the DARPA CHATS research program.
13 *
14 * This software was enhanced by SPARTA ISSO under SPAWAR contract
15 * N66001-04-C-6019 ("SEFOS").
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 *
|
39 */
40
41/*
42 * Developed by the TrustedBSD Project.
43 *
44 * Prevent processes owned by a particular uid from seeing various transient
45 * kernel objects associated with other uids.
46 */
47
48#include <sys/param.h>
49#include <sys/kernel.h>
50#include <sys/module.h>
51#include <sys/priv.h>
52#include <sys/proc.h>
53#include <sys/systm.h>
54#include <sys/socketvar.h>
55#include <sys/sysctl.h>
56
57#include <security/mac/mac_policy.h>
58
59SYSCTL_DECL(_security_mac);
60
61SYSCTL_NODE(_security_mac, OID_AUTO, seeotheruids, CTLFLAG_RW, 0,
62 "TrustedBSD mac_seeotheruids policy controls");
63
64static int seeotheruids_enabled = 1;
65SYSCTL_INT(_security_mac_seeotheruids, OID_AUTO, enabled, CTLFLAG_RW,
66 &seeotheruids_enabled, 0, "Enforce seeotheruids policy");
67
68/*
69 * Exception: allow credentials to be aware of other credentials with the
70 * same primary gid.
71 */
72static int primarygroup_enabled = 0;
73SYSCTL_INT(_security_mac_seeotheruids, OID_AUTO, primarygroup_enabled,
74 CTLFLAG_RW, &primarygroup_enabled, 0, "Make an exception for credentials "
75 "with the same real primary group id");
76
77/*
78 * Exception: allow the root user to be aware of other credentials by virtue
79 * of privilege.
80 */
81static int suser_privileged = 1;
82SYSCTL_INT(_security_mac_seeotheruids, OID_AUTO, suser_privileged,
83 CTLFLAG_RW, &suser_privileged, 0, "Make an exception for superuser");
84
85/*
86 * Exception: allow processes with a specific gid to be exempt from the
87 * policy. One sysctl enables this functionality; the other sets the
88 * exempt gid.
89 */
90static int specificgid_enabled = 0;
91SYSCTL_INT(_security_mac_seeotheruids, OID_AUTO, specificgid_enabled,
92 CTLFLAG_RW, &specificgid_enabled, 0, "Make an exception for credentials "
93 "with a specific gid as their real primary group id or group set");
94
95static gid_t specificgid = 0;
96SYSCTL_INT(_security_mac_seeotheruids, OID_AUTO, specificgid, CTLFLAG_RW,
97 &specificgid, 0, "Specific gid to be exempt from seeotheruids policy");
98
99static int
100seeotheruids_check(struct ucred *cr1, struct ucred *cr2)
101{
102
103 if (!seeotheruids_enabled)
104 return (0);
105
106 if (primarygroup_enabled) {
107 if (cr1->cr_rgid == cr2->cr_rgid)
108 return (0);
109 }
110
111 if (specificgid_enabled) {
112 if (cr1->cr_rgid == specificgid ||
113 groupmember(specificgid, cr1))
114 return (0);
115 }
116
117 if (cr1->cr_ruid == cr2->cr_ruid)
118 return (0);
119
120 if (suser_privileged) {
121 if (priv_check_cred(cr1, PRIV_SEEOTHERUIDS, 0) == 0)
122 return (0);
123 }
124
125 return (ESRCH);
126}
127
128static int
129seeotheruids_proc_check_debug(struct ucred *cred, struct proc *p)
130{
131
132 return (seeotheruids_check(cred, p->p_ucred));
133}
134
135static int
136seeotheruids_proc_check_sched(struct ucred *cred, struct proc *p)
137{
138
139 return (seeotheruids_check(cred, p->p_ucred));
140}
141
142static int
143seeotheruids_proc_check_signal(struct ucred *cred, struct proc *p,
144 int signum)
145{
146
147 return (seeotheruids_check(cred, p->p_ucred));
148}
149
150static int
151seeotheruids_cred_check_visible(struct ucred *cr1, struct ucred *cr2)
152{
153
154 return (seeotheruids_check(cr1, cr2));
155}
156
157static int
158seeotheruids_socket_check_visible(struct ucred *cred, struct socket *so,
159 struct label *solabel)
160{
161
162 return (seeotheruids_check(cred, so->so_cred));
163}
164
165static struct mac_policy_ops seeotheruids_ops =
166{
167 .mpo_proc_check_debug = seeotheruids_proc_check_debug,
168 .mpo_proc_check_sched = seeotheruids_proc_check_sched,
169 .mpo_proc_check_signal = seeotheruids_proc_check_signal,
170 .mpo_cred_check_visible = seeotheruids_cred_check_visible,
171 .mpo_socket_check_visible = seeotheruids_socket_check_visible,
172};
173
174MAC_POLICY_SET(&seeotheruids_ops, mac_seeotheruids,
| 39 */
40
41/*
42 * Developed by the TrustedBSD Project.
43 *
44 * Prevent processes owned by a particular uid from seeing various transient
45 * kernel objects associated with other uids.
46 */
47
48#include <sys/param.h>
49#include <sys/kernel.h>
50#include <sys/module.h>
51#include <sys/priv.h>
52#include <sys/proc.h>
53#include <sys/systm.h>
54#include <sys/socketvar.h>
55#include <sys/sysctl.h>
56
57#include <security/mac/mac_policy.h>
58
59SYSCTL_DECL(_security_mac);
60
61SYSCTL_NODE(_security_mac, OID_AUTO, seeotheruids, CTLFLAG_RW, 0,
62 "TrustedBSD mac_seeotheruids policy controls");
63
64static int seeotheruids_enabled = 1;
65SYSCTL_INT(_security_mac_seeotheruids, OID_AUTO, enabled, CTLFLAG_RW,
66 &seeotheruids_enabled, 0, "Enforce seeotheruids policy");
67
68/*
69 * Exception: allow credentials to be aware of other credentials with the
70 * same primary gid.
71 */
72static int primarygroup_enabled = 0;
73SYSCTL_INT(_security_mac_seeotheruids, OID_AUTO, primarygroup_enabled,
74 CTLFLAG_RW, &primarygroup_enabled, 0, "Make an exception for credentials "
75 "with the same real primary group id");
76
77/*
78 * Exception: allow the root user to be aware of other credentials by virtue
79 * of privilege.
80 */
81static int suser_privileged = 1;
82SYSCTL_INT(_security_mac_seeotheruids, OID_AUTO, suser_privileged,
83 CTLFLAG_RW, &suser_privileged, 0, "Make an exception for superuser");
84
85/*
86 * Exception: allow processes with a specific gid to be exempt from the
87 * policy. One sysctl enables this functionality; the other sets the
88 * exempt gid.
89 */
90static int specificgid_enabled = 0;
91SYSCTL_INT(_security_mac_seeotheruids, OID_AUTO, specificgid_enabled,
92 CTLFLAG_RW, &specificgid_enabled, 0, "Make an exception for credentials "
93 "with a specific gid as their real primary group id or group set");
94
95static gid_t specificgid = 0;
96SYSCTL_INT(_security_mac_seeotheruids, OID_AUTO, specificgid, CTLFLAG_RW,
97 &specificgid, 0, "Specific gid to be exempt from seeotheruids policy");
98
99static int
100seeotheruids_check(struct ucred *cr1, struct ucred *cr2)
101{
102
103 if (!seeotheruids_enabled)
104 return (0);
105
106 if (primarygroup_enabled) {
107 if (cr1->cr_rgid == cr2->cr_rgid)
108 return (0);
109 }
110
111 if (specificgid_enabled) {
112 if (cr1->cr_rgid == specificgid ||
113 groupmember(specificgid, cr1))
114 return (0);
115 }
116
117 if (cr1->cr_ruid == cr2->cr_ruid)
118 return (0);
119
120 if (suser_privileged) {
121 if (priv_check_cred(cr1, PRIV_SEEOTHERUIDS, 0) == 0)
122 return (0);
123 }
124
125 return (ESRCH);
126}
127
128static int
129seeotheruids_proc_check_debug(struct ucred *cred, struct proc *p)
130{
131
132 return (seeotheruids_check(cred, p->p_ucred));
133}
134
135static int
136seeotheruids_proc_check_sched(struct ucred *cred, struct proc *p)
137{
138
139 return (seeotheruids_check(cred, p->p_ucred));
140}
141
142static int
143seeotheruids_proc_check_signal(struct ucred *cred, struct proc *p,
144 int signum)
145{
146
147 return (seeotheruids_check(cred, p->p_ucred));
148}
149
150static int
151seeotheruids_cred_check_visible(struct ucred *cr1, struct ucred *cr2)
152{
153
154 return (seeotheruids_check(cr1, cr2));
155}
156
157static int
158seeotheruids_socket_check_visible(struct ucred *cred, struct socket *so,
159 struct label *solabel)
160{
161
162 return (seeotheruids_check(cred, so->so_cred));
163}
164
165static struct mac_policy_ops seeotheruids_ops =
166{
167 .mpo_proc_check_debug = seeotheruids_proc_check_debug,
168 .mpo_proc_check_sched = seeotheruids_proc_check_sched,
169 .mpo_proc_check_signal = seeotheruids_proc_check_signal,
170 .mpo_cred_check_visible = seeotheruids_cred_check_visible,
171 .mpo_socket_check_visible = seeotheruids_socket_check_visible,
172};
173
174MAC_POLICY_SET(&seeotheruids_ops, mac_seeotheruids,
|