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mac_seeotheruids.c (172930) mac_seeotheruids.c (172955)
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 *

--- 21 unchanged lines hidden (view full) ---

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 *

--- 21 unchanged lines hidden (view full) ---

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 *
38 * $FreeBSD: head/sys/security/mac_seeotheruids/mac_seeotheruids.c 172930 2007-10-24 19:04:04Z rwatson $
38 * $FreeBSD: head/sys/security/mac_seeotheruids/mac_seeotheruids.c 172955 2007-10-25 11:31:11Z rwatson $
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 */

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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
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 */

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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 mac_seeotheruids_enabled = 1;
64static int seeotheruids_enabled = 1;
65SYSCTL_INT(_security_mac_seeotheruids, OID_AUTO, enabled, CTLFLAG_RW,
65SYSCTL_INT(_security_mac_seeotheruids, OID_AUTO, enabled, CTLFLAG_RW,
66 &mac_seeotheruids_enabled, 0, "Enforce seeotheruids policy");
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 "

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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
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 "

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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
100mac_seeotheruids_check(struct ucred *cr1, struct ucred *cr2)
100seeotheruids_check(struct ucred *cr1, struct ucred *cr2)
101{
102
101{
102
103 if (!mac_seeotheruids_enabled)
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) {

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121 if (priv_check_cred(cr1, PRIV_SEEOTHERUIDS, 0) == 0)
122 return (0);
123 }
124
125 return (ESRCH);
126}
127
128static int
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) {

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121 if (priv_check_cred(cr1, PRIV_SEEOTHERUIDS, 0) == 0)
122 return (0);
123 }
124
125 return (ESRCH);
126}
127
128static int
129mac_seeotheruids_cred_check_visible(struct ucred *cr1, struct ucred *cr2)
129seeotheruids_cred_check_visible(struct ucred *cr1, struct ucred *cr2)
130{
131
130{
131
132 return (mac_seeotheruids_check(cr1, cr2));
132 return (seeotheruids_check(cr1, cr2));
133}
134
135static int
133}
134
135static int
136mac_seeotheruids_proc_check_signal(struct ucred *cred, struct proc *p,
136seeotheruids_proc_check_signal(struct ucred *cred, struct proc *p,
137 int signum)
138{
139
137 int signum)
138{
139
140 return (mac_seeotheruids_check(cred, p->p_ucred));
140 return (seeotheruids_check(cred, p->p_ucred));
141}
142
143static int
141}
142
143static int
144mac_seeotheruids_proc_check_sched(struct ucred *cred, struct proc *p)
144seeotheruids_proc_check_sched(struct ucred *cred, struct proc *p)
145{
146
145{
146
147 return (mac_seeotheruids_check(cred, p->p_ucred));
147 return (seeotheruids_check(cred, p->p_ucred));
148}
149
150static int
148}
149
150static int
151mac_seeotheruids_proc_check_debug(struct ucred *cred, struct proc *p)
151seeotheruids_proc_check_debug(struct ucred *cred, struct proc *p)
152{
153
152{
153
154 return (mac_seeotheruids_check(cred, p->p_ucred));
154 return (seeotheruids_check(cred, p->p_ucred));
155}
156
157static int
155}
156
157static int
158mac_seeotheruids_socket_check_visible(struct ucred *cred, struct socket *so,
158seeotheruids_socket_check_visible(struct ucred *cred, struct socket *so,
159 struct label *solabel)
160{
161
159 struct label *solabel)
160{
161
162 return (mac_seeotheruids_check(cred, so->so_cred));
162 return (seeotheruids_check(cred, so->so_cred));
163}
164
163}
164
165static struct mac_policy_ops mac_seeotheruids_ops =
165static struct mac_policy_ops seeotheruids_ops =
166{
166{
167 .mpo_cred_check_visible = mac_seeotheruids_cred_check_visible,
168 .mpo_proc_check_debug = mac_seeotheruids_proc_check_debug,
169 .mpo_proc_check_sched = mac_seeotheruids_proc_check_sched,
170 .mpo_proc_check_signal = mac_seeotheruids_proc_check_signal,
171 .mpo_socket_check_visible = mac_seeotheruids_socket_check_visible,
167 .mpo_cred_check_visible = seeotheruids_cred_check_visible,
168 .mpo_proc_check_debug = seeotheruids_proc_check_debug,
169 .mpo_proc_check_sched = seeotheruids_proc_check_sched,
170 .mpo_proc_check_signal = seeotheruids_proc_check_signal,
171 .mpo_socket_check_visible = seeotheruids_socket_check_visible,
172};
173
172};
173
174MAC_POLICY_SET(&mac_seeotheruids_ops, mac_seeotheruids,
174MAC_POLICY_SET(&seeotheruids_ops, mac_seeotheruids,
175 "TrustedBSD MAC/seeotheruids", MPC_LOADTIME_FLAG_UNLOADOK, NULL);
175 "TrustedBSD MAC/seeotheruids", MPC_LOADTIME_FLAG_UNLOADOK, NULL);