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

     /*-
      * Copyright (c) 2002, 2003 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("$FreeBSD$");
    
    #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/mac.h>
    #include <sys/sbuf.h>
    #include <sys/systm.h>
    #include <sys/vnode.h>
    #include <sys/pipe.h>
    #include <sys/sysctl.h>
    
    #include <sys/mac_policy.h>
    
    #include <security/mac/mac_internal.h>
    
    static int      mac_enforce_pipe = 1;
    SYSCTL_INT(_security_mac, OID_AUTO, enforce_pipe, CTLFLAG_RW,
        &mac_enforce_pipe, 0, "Enforce MAC policy on pipe operations");
    TUNABLE_INT("security.mac.enforce_pipe", &mac_enforce_pipe);
    
    #ifdef MAC_DEBUG
    static unsigned int nmacpipes;
    SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, pipes, CTLFLAG_RD,
        &nmacpipes, 0, "number of pipes in use");
    #endif
    
    struct label *
    mac_pipe_label_alloc(void)
    {
            struct label *label;
    
            label = mac_labelzone_alloc(M_WAITOK);
            MAC_PERFORM(init_pipe_label, label);
            MAC_DEBUG_COUNTER_INC(&nmacpipes);
            return (label);
    }
    
    void
    mac_init_pipe(struct pipepair *pp)
    {
    
            pp->pp_label = mac_pipe_label_alloc();
    }
    
    void
    mac_pipe_label_free(struct label *label)
    {
    
            MAC_PERFORM(destroy_pipe_label, label);
            mac_labelzone_free(label);
            MAC_DEBUG_COUNTER_DEC(&nmacpipes);
    }
    
    void
    mac_destroy_pipe(struct pipepair *pp)
    {
    
            mac_pipe_label_free(pp->pp_label);
            pp->pp_label = NULL;
    }
    
   void
   mac_copy_pipe_label(struct label *src, struct label *dest)
   {
   
           MAC_PERFORM(copy_pipe_label, src, dest);
   }
   
   int
   mac_externalize_pipe_label(struct label *label, char *elements,
       char *outbuf, size_t outbuflen)
   {
           int error;
   
           MAC_EXTERNALIZE(pipe, label, elements, outbuf, outbuflen);
   
           return (error);
   }
   
   int
   mac_internalize_pipe_label(struct label *label, char *string)
   {
           int error;
   
           MAC_INTERNALIZE(pipe, label, string);
   
           return (error);
   }
   
   void
   mac_create_pipe(struct ucred *cred, struct pipepair *pp)
   {
   
           MAC_PERFORM(create_pipe, cred, pp, pp->pp_label);
   }
   
   static void
   mac_relabel_pipe(struct ucred *cred, struct pipepair *pp,
       struct label *newlabel)
   {
   
           MAC_PERFORM(relabel_pipe, cred, pp, pp->pp_label, newlabel);
   }
   
   int
   mac_check_pipe_ioctl(struct ucred *cred, struct pipepair *pp,
       unsigned long cmd, void *data)
   {
           int error;
   
           mtx_assert(&pp->pp_mtx, MA_OWNED);
   
           if (!mac_enforce_pipe)
                   return (0);
   
           MAC_CHECK(check_pipe_ioctl, cred, pp, pp->pp_label, cmd, data);
   
           return (error);
   }
   
   int
   mac_check_pipe_poll(struct ucred *cred, struct pipepair *pp)
   {
           int error;
   
           mtx_assert(&pp->pp_mtx, MA_OWNED);
   
           if (!mac_enforce_pipe)
                   return (0);
   
           MAC_CHECK(check_pipe_poll, cred, pp, pp->pp_label);
   
           return (error);
   }
   
   int
   mac_check_pipe_read(struct ucred *cred, struct pipepair *pp)
   {
           int error;
   
           mtx_assert(&pp->pp_mtx, MA_OWNED);
   
           if (!mac_enforce_pipe)
                   return (0);
   
           MAC_CHECK(check_pipe_read, cred, pp, pp->pp_label);
   
           return (error);
   }
   
   static int
   mac_check_pipe_relabel(struct ucred *cred, struct pipepair *pp,
       struct label *newlabel)
   {
           int error;
   
           mtx_assert(&pp->pp_mtx, MA_OWNED);
   
           if (!mac_enforce_pipe)
                   return (0);
   
           MAC_CHECK(check_pipe_relabel, cred, pp, pp->pp_label, newlabel);
   
           return (error);
   }
   
   int
   mac_check_pipe_stat(struct ucred *cred, struct pipepair *pp)
   {
           int error;
   
           mtx_assert(&pp->pp_mtx, MA_OWNED);
   
           if (!mac_enforce_pipe)
                   return (0);
   
           MAC_CHECK(check_pipe_stat, cred, pp, pp->pp_label);
   
           return (error);
   }
   
   int
   mac_check_pipe_write(struct ucred *cred, struct pipepair *pp)
   {
           int error;
   
           mtx_assert(&pp->pp_mtx, MA_OWNED);
   
           if (!mac_enforce_pipe)
                   return (0);
   
           MAC_CHECK(check_pipe_write, cred, pp, pp->pp_label);
   
           return (error);
   }
   
   int
   mac_pipe_label_set(struct ucred *cred, struct pipepair *pp,
       struct label *label)
   {
           int error;
   
           mtx_assert(&pp->pp_mtx, MA_OWNED);
   
           error = mac_check_pipe_relabel(cred, pp, label);
           if (error)
                   return (error);
   
           mac_relabel_pipe(cred, pp, label);
   
           return (0);
   }

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