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

     /*-
      * Copyright (c) 2003-2004 Networks Associates Technology, Inc.
      * 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.
      *
     * 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.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/6.2/sys/security/mac/mac_sysv_msg.c 142383 2005-02-24 16:08:41Z rwatson $");
    
    #include "opt_mac.h"
    
    #include <sys/param.h>
    #include <sys/kernel.h>
    #include <sys/lock.h>
    #include <sys/malloc.h>
    #include <sys/mutex.h>
    #include <sys/mac.h>
    #include <sys/sbuf.h>
    #include <sys/systm.h>
    #include <sys/vnode.h>
    #include <sys/mount.h>
    #include <sys/file.h>
    #include <sys/namei.h>
    #include <sys/sysctl.h>
    #include <sys/msg.h>
    
    #include <sys/mac_policy.h>
    
    #include <security/mac/mac_internal.h>
    
    static int      mac_enforce_sysv_msg = 1;
    SYSCTL_INT(_security_mac, OID_AUTO, enforce_sysv_msg, CTLFLAG_RW,
        &mac_enforce_sysv_msg, 0,
        "Enforce MAC policy on System V IPC Message Queues");
    TUNABLE_INT("security.mac.enforce_sysv_msg", &mac_enforce_sysv_msg);
    
    #ifdef MAC_DEBUG
    static unsigned int nmacipcmsgs, nmacipcmsqs;
    SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, ipc_msgs, CTLFLAG_RD,
        &nmacipcmsgs, 0, "number of sysv ipc messages inuse");
    SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, ipc_msqs, CTLFLAG_RD,
        &nmacipcmsqs, 0, "number of sysv ipc message queue identifiers inuse");
    #endif
    
    static struct label *
    mac_sysv_msgmsg_label_alloc(void)
    {
            struct label *label;
    
            label = mac_labelzone_alloc(M_WAITOK);
            MAC_PERFORM(init_sysv_msgmsg_label, label);
            MAC_DEBUG_COUNTER_INC(&nmacipcmsgs);
            return (label);
    }
    
    void
    mac_init_sysv_msgmsg(struct msg *msgptr)
    {
    
            msgptr->label = mac_sysv_msgmsg_label_alloc();
    }
    
    static struct label *
    mac_sysv_msgqueue_label_alloc(void)
    {
            struct label *label;
    
            label = mac_labelzone_alloc(M_WAITOK);
            MAC_PERFORM(init_sysv_msgqueue_label, label);
            MAC_DEBUG_COUNTER_INC(&nmacipcmsqs);
            return (label);
    }
    
    void
   mac_init_sysv_msgqueue(struct msqid_kernel *msqkptr)
   {
   
           msqkptr->label = mac_sysv_msgqueue_label_alloc();
   }
   
   static void
   mac_sysv_msgmsg_label_free(struct label *label)
   {
   
           MAC_PERFORM(destroy_sysv_msgmsg_label, label);
           mac_labelzone_free(label);
           MAC_DEBUG_COUNTER_DEC(&nmacipcmsgs);
   }
   
   void
   mac_destroy_sysv_msgmsg(struct msg *msgptr)
   {
   
           mac_sysv_msgmsg_label_free(msgptr->label);
           msgptr->label = NULL;
   }
   
   static void
   mac_sysv_msgqueue_label_free(struct label *label)
   {
   
           MAC_PERFORM(destroy_sysv_msgqueue_label, label);
           mac_labelzone_free(label);
           MAC_DEBUG_COUNTER_DEC(&nmacipcmsqs);
   }
   
   void
   mac_destroy_sysv_msgqueue(struct msqid_kernel *msqkptr)
   {
   
           mac_sysv_msgqueue_label_free(msqkptr->label);
           msqkptr->label = NULL;
   }
   
   void
   mac_create_sysv_msgmsg(struct ucred *cred, struct msqid_kernel *msqkptr, 
       struct msg *msgptr)
   {
                                   
           MAC_PERFORM(create_sysv_msgmsg, cred, msqkptr, msqkptr->label, 
                   msgptr, msgptr->label);
   }
   
   void
   mac_create_sysv_msgqueue(struct ucred *cred, struct msqid_kernel *msqkptr)
   {
                                   
           MAC_PERFORM(create_sysv_msgqueue, cred, msqkptr, msqkptr->label);
   }
   
   void
   mac_cleanup_sysv_msgmsg(struct msg *msgptr)
   {
   
           MAC_PERFORM(cleanup_sysv_msgmsg, msgptr->label);
   }
   
   void
   mac_cleanup_sysv_msgqueue(struct msqid_kernel *msqkptr)
   {
                                   
           MAC_PERFORM(cleanup_sysv_msgqueue, msqkptr->label);
   }
   
   int
   mac_check_sysv_msgmsq(struct ucred *cred, struct msg *msgptr,
           struct msqid_kernel *msqkptr)
   {
           int error;
   
           if (!mac_enforce_sysv_msg)
                   return (0);
   
           MAC_CHECK(check_sysv_msgmsq, cred,  msgptr, msgptr->label, msqkptr,
               msqkptr->label);
   
           return(error);
   }
   
   int
   mac_check_sysv_msgrcv(struct ucred *cred, struct msg *msgptr)
   {
           int error;
   
           if (!mac_enforce_sysv_msg)
                   return (0);
   
           MAC_CHECK(check_sysv_msgrcv, cred, msgptr, msgptr->label);
   
           return(error);
   }
   
   int
   mac_check_sysv_msgrmid(struct ucred *cred, struct msg *msgptr)
   {
           int error;
   
           if (!mac_enforce_sysv_msg)
                   return (0);
   
           MAC_CHECK(check_sysv_msgrmid, cred,  msgptr, msgptr->label);
   
           return(error);
   }
   
   int
   mac_check_sysv_msqget(struct ucred *cred, struct msqid_kernel *msqkptr)
   {
           int error;
   
           if (!mac_enforce_sysv_msg)
                   return (0);
   
           MAC_CHECK(check_sysv_msqget, cred, msqkptr, msqkptr->label);
   
           return(error);
   }
   
   int
   mac_check_sysv_msqsnd(struct ucred *cred, struct msqid_kernel *msqkptr)
   {
           int error;
   
           if (!mac_enforce_sysv_msg)
                   return (0);
   
           MAC_CHECK(check_sysv_msqsnd, cred, msqkptr, msqkptr->label);
   
           return(error);
   }
   
   int
   mac_check_sysv_msqrcv(struct ucred *cred, struct msqid_kernel *msqkptr)
   {
           int error;
   
           if (!mac_enforce_sysv_msg)
                   return (0);
   
           MAC_CHECK(check_sysv_msqrcv, cred, msqkptr, msqkptr->label);
   
           return(error);
   }
   
   int
   mac_check_sysv_msqctl(struct ucred *cred, struct msqid_kernel *msqkptr,
       int cmd)
   {
           int error;
   
           if (!mac_enforce_sysv_msg)
                   return (0);
   
           MAC_CHECK(check_sysv_msqctl, cred, msqkptr, msqkptr->label, cmd);
   
           return(error);
   }

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