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 * $FreeBSD$ 29 */ 30 31 #include <sys/param.h> 32 #include <sys/kernel.h> 33 #include <sys/module.h> 34 #include <sys/priv.h> 35 #include <sys/sysctl.h> 36 #include <sys/ucred.h> 37 38 #include <security/mac/mac_policy.h> 39 40 SYSCTL_DECL(_security_mac); 41 42 static SYSCTL_NODE(_security_mac, OID_AUTO, pimd, 43 CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 44 "mac_pimd policy controls"); 45 46 static int pimd_enabled = 0; 47 SYSCTL_INT(_security_mac_pimd, OID_AUTO, enabled, CTLFLAG_RWTUN, 48 &pimd_enabled, 0, "Enable mac_pimd policy"); 49 50 static int pimd_uid = 0; 51 SYSCTL_INT(_security_mac_pimd, OID_AUTO, uid, CTLFLAG_RWTUN, 52 &pimd_uid, 0, "User id for pimd user"); 53 54 static int 55 pimd_priv_grant(struct ucred *cred, int priv) 56 { 57 58 if (pimd_enabled && cred->cr_uid == pimd_uid) { 59 switch (priv) { 60 case PRIV_NETINET_MROUTE: 61 return (0); 62 default: 63 break; 64 } 65 } 66 return (EPERM); 67 } 68 69 static struct mac_policy_ops pimd_ops = 70 { 71 .mpo_priv_grant = pimd_priv_grant, 72 }; 73 74 MAC_POLICY_SET(&pimd_ops, mac_pimd, "MAC/pimd", 75 MPC_LOADTIME_FLAG_UNLOADOK, NULL); 76