FreeBSD/Linux Kernel Cross Reference
sys/security/mac/mac_system.c

     /*-
      * Copyright (c) 2002-2003 Networks Associates Technology, Inc.
      * Copyright (c) 2006 SPARTA, Inc.
      * Copyright (c) 2007, 2009 Robert N. M. Watson
      * All rights reserved.
      *
      * This software was developed for the FreeBSD Project in part by Network
      * Associates Laboratories, the Security Research Division of Network
      * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
     * as part of the DARPA CHATS research program.
     *
     * Portions of this software were developed by Robert Watson for the
     * TrustedBSD Project.
     *
     * This software was enhanced by SPARTA ISSO under SPAWAR contract
     * N66001-04-C-6019 ("SEFOS").
     *
     * This software was developed at the University of Cambridge Computer
     * Laboratory with support from a grant from Google, Inc.
     *
     * 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.
     */
    
    /*
     * MAC Framework entry points relating to overall operation of system,
     * including global services such as the kernel environment and loadable
     * modules.
     *
     * System checks often align with existing privilege checks, but provide
     * additional security context that may be relevant to policies, such as the
     * specific object being operated on.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/11.0/sys/security/mac/mac_system.c 258541 2013-11-25 07:38:45Z attilio $");
    
    #include "opt_mac.h"
    
    #include <sys/param.h>
    #include <sys/kernel.h>
    #include <sys/lock.h>
    #include <sys/malloc.h>
    #include <sys/module.h>
    #include <sys/mutex.h>
    #include <sys/sdt.h>
    #include <sys/systm.h>
    #include <sys/vnode.h>
    #include <sys/sysctl.h>
    
    #include <security/mac/mac_framework.h>
    #include <security/mac/mac_internal.h>
    #include <security/mac/mac_policy.h>
    
    MAC_CHECK_PROBE_DEFINE1(kenv_check_dump, "struct ucred *");
    
    int
    mac_kenv_check_dump(struct ucred *cred)
    {
            int error;
    
            MAC_POLICY_CHECK_NOSLEEP(kenv_check_dump, cred);
            MAC_CHECK_PROBE1(kenv_check_dump, error, cred);
    
            return (error);
    }
    
    MAC_CHECK_PROBE_DEFINE2(kenv_check_get, "struct ucred *", "char *");
    
    int
    mac_kenv_check_get(struct ucred *cred, char *name)
    {
            int error;
    
            MAC_POLICY_CHECK_NOSLEEP(kenv_check_get, cred, name);
            MAC_CHECK_PROBE2(kenv_check_get, error, cred, name);
    
            return (error);
    }
    
    MAC_CHECK_PROBE_DEFINE3(kenv_check_set, "struct ucred *", "char *",
       "char *");
   
   int
   mac_kenv_check_set(struct ucred *cred, char *name, char *value)
   {
           int error;
   
           MAC_POLICY_CHECK_NOSLEEP(kenv_check_set, cred, name, value);
           MAC_CHECK_PROBE3(kenv_check_set, error, cred, name, value);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE2(kenv_check_unset, "struct ucred *", "char *");
   
   int
   mac_kenv_check_unset(struct ucred *cred, char *name)
   {
           int error;
   
           MAC_POLICY_CHECK_NOSLEEP(kenv_check_unset, cred, name);
           MAC_CHECK_PROBE2(kenv_check_unset, error, cred, name);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE2(kld_check_load, "struct ucred *", "struct vnode *");
   
   int
   mac_kld_check_load(struct ucred *cred, struct vnode *vp)
   {
           int error;
   
           ASSERT_VOP_LOCKED(vp, "mac_kld_check_load");
   
           MAC_POLICY_CHECK(kld_check_load, cred, vp, vp->v_label);
           MAC_CHECK_PROBE2(kld_check_load, error, cred, vp);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE1(kld_check_stat, "struct ucred *");
   
   int
   mac_kld_check_stat(struct ucred *cred)
   {
           int error;
   
           MAC_POLICY_CHECK_NOSLEEP(kld_check_stat, cred);
           MAC_CHECK_PROBE1(kld_check_stat, error, cred);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE2(system_check_acct, "struct ucred *",
       "struct vnode *");
   
   int
   mac_system_check_acct(struct ucred *cred, struct vnode *vp)
   {
           int error;
   
           if (vp != NULL) {
                   ASSERT_VOP_LOCKED(vp, "mac_system_check_acct");
           }
   
           MAC_POLICY_CHECK(system_check_acct, cred, vp,
               vp != NULL ? vp->v_label : NULL);
           MAC_CHECK_PROBE2(system_check_acct, error, cred, vp);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE2(system_check_reboot, "struct ucred *", "int");
   
   int
   mac_system_check_reboot(struct ucred *cred, int howto)
   {
           int error;
   
           MAC_POLICY_CHECK_NOSLEEP(system_check_reboot, cred, howto);
           MAC_CHECK_PROBE2(system_check_reboot, error, cred, howto);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE2(system_check_swapon, "struct ucred *",
       "struct vnode *");
   
   int
   mac_system_check_swapon(struct ucred *cred, struct vnode *vp)
   {
           int error;
   
           ASSERT_VOP_LOCKED(vp, "mac_system_check_swapon");
   
           MAC_POLICY_CHECK(system_check_swapon, cred, vp, vp->v_label);
           MAC_CHECK_PROBE2(system_check_swapon, error, cred, vp);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE2(system_check_swapoff, "struct ucred *",
       "struct vnode *");
   
   int
   mac_system_check_swapoff(struct ucred *cred, struct vnode *vp)
   {
           int error;
   
           ASSERT_VOP_LOCKED(vp, "mac_system_check_swapoff");
   
           MAC_POLICY_CHECK(system_check_swapoff, cred, vp, vp->v_label);
           MAC_CHECK_PROBE2(system_check_swapoff, error, cred, vp);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE3(system_check_sysctl, "struct ucred *",
       "struct sysctl_oid *", "struct sysctl_req *");
   
   int
   mac_system_check_sysctl(struct ucred *cred, struct sysctl_oid *oidp,
       void *arg1, int arg2, struct sysctl_req *req)
   {
           int error;
   
           /*
            * XXXMAC: We would very much like to assert the SYSCTL_LOCK here,
            * but since it's not exported from kern_sysctl.c, we can't.
            */
           MAC_POLICY_CHECK_NOSLEEP(system_check_sysctl, cred, oidp, arg1, arg2,
               req);
           MAC_CHECK_PROBE3(system_check_sysctl, error, cred, oidp, req);
   
           return (error);
   }

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