FreeBSD/Linux Kernel Cross Reference
sys/security/mac_pimd/mac_pimd.c

     /*-
      * SPDX-License-Identifier: BSD-2-Clause
      *
      * Copyright (c) 2022 Semihalf, Stormshield
      * Copyright (c) 2018 Ian Lepore <ian@FreeBSD.org>
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * $FreeBSD$
     */
    
    #include <sys/param.h>
    #include <sys/kernel.h>
    #include <sys/module.h>
    #include <sys/priv.h>
    #include <sys/sysctl.h>
    #include <sys/ucred.h>
    
    #include <security/mac/mac_policy.h>
    
    SYSCTL_DECL(_security_mac);
    
    static SYSCTL_NODE(_security_mac, OID_AUTO, pimd,
        CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
        "mac_pimd policy controls");
    
    static int pimd_enabled = 0;
    SYSCTL_INT(_security_mac_pimd, OID_AUTO, enabled, CTLFLAG_RWTUN,
        &pimd_enabled, 0, "Enable mac_pimd policy");
    
    static int pimd_uid = 0;
    SYSCTL_INT(_security_mac_pimd, OID_AUTO, uid, CTLFLAG_RWTUN,
        &pimd_uid, 0, "User id for pimd user");
    
    static int
    pimd_priv_grant(struct ucred *cred, int priv)
    {
    
            if (pimd_enabled && cred->cr_uid == pimd_uid) {
                    switch (priv) {
                    case PRIV_NETINET_MROUTE:
                            return (0);
                    default:
                            break;
                    }
            }
            return (EPERM);
    }
    
    static struct mac_policy_ops pimd_ops =
    {
            .mpo_priv_grant = pimd_priv_grant,
    };
    
    MAC_POLICY_SET(&pimd_ops, mac_pimd, "MAC/pimd",
        MPC_LOADTIME_FLAG_UNLOADOK, NULL);

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