1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2022 Semihalf, Stormshield
5 * Copyright (c) 2018 Ian Lepore <ian@FreeBSD.org>
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/param.h>
30 #include <sys/kernel.h>
31 #include <sys/module.h>
32 #include <sys/priv.h>
33 #include <sys/sysctl.h>
34 #include <sys/ucred.h>
35
36 #include <security/mac/mac_policy.h>
37
38 SYSCTL_DECL(_security_mac);
39
40 static SYSCTL_NODE(_security_mac, OID_AUTO, pimd,
41 CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
42 "mac_pimd policy controls");
43
44 static int pimd_enabled = 0;
45 SYSCTL_INT(_security_mac_pimd, OID_AUTO, enabled, CTLFLAG_RWTUN,
46 &pimd_enabled, 0, "Enable mac_pimd policy");
47
48 static int pimd_uid = 0;
49 SYSCTL_INT(_security_mac_pimd, OID_AUTO, uid, CTLFLAG_RWTUN,
50 &pimd_uid, 0, "User id for pimd user");
51
52 static int
pimd_priv_grant(struct ucred * cred,int priv)53 pimd_priv_grant(struct ucred *cred, int priv)
54 {
55
56 if (pimd_enabled && cred->cr_uid == pimd_uid) {
57 switch (priv) {
58 case PRIV_NETINET_MROUTE:
59 return (0);
60 default:
61 break;
62 }
63 }
64 return (EPERM);
65 }
66
67 static struct mac_policy_ops pimd_ops =
68 {
69 .mpo_priv_grant = pimd_priv_grant,
70 };
71
72 MAC_POLICY_SET(&pimd_ops, mac_pimd, "MAC/pimd",
73 MPC_LOADTIME_FLAG_UNLOADOK, NULL);
74