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

     /*-
      * Copyright (c) 1999-2002 Robert N. M. Watson
      * Copyright (c) 2001 Ilmar S. Habibulin
      * Copyright (c) 2001-2004 Networks Associates Technology, Inc.
      * All rights reserved.
      *
      * This software was developed by Robert Watson and Ilmar Habibulin for the
      * TrustedBSD Project.
      *
     * 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/mutex.h>
    #include <sys/sbuf.h>
    #include <sys/systm.h>
    #include <sys/mount.h>
    #include <sys/file.h>
    #include <sys/namei.h>
    #include <sys/protosw.h>
    #include <sys/socket.h>
    #include <sys/socketvar.h>
    #include <sys/sysctl.h>
    
    #include <net/if.h>
    #include <net/if_var.h>
    
    #include <netinet/in.h>
    #include <netinet/in_pcb.h>
    #include <netinet/ip_var.h>
    
    #include <security/mac/mac_framework.h>
    #include <security/mac/mac_internal.h>
    #include <security/mac/mac_policy.h>
    
    static struct label *
    mac_inpcb_label_alloc(int flag)
    {
            struct label *label;
            int error;
    
            label = mac_labelzone_alloc(flag);
            if (label == NULL)
                    return (NULL);
            MAC_CHECK(init_inpcb_label, label, flag);
            if (error) {
                    MAC_PERFORM(destroy_inpcb_label, label);
                    mac_labelzone_free(label);
                    return (NULL);
            }
            return (label);
    }
    
    int
    mac_init_inpcb(struct inpcb *inp, int flag)
    {
    
            inp->inp_label = mac_inpcb_label_alloc(flag);
            if (inp->inp_label == NULL)
                    return (ENOMEM);
            return (0);
    }
    
    static struct label *
    mac_ipq_label_alloc(int flag)
    {
            struct label *label;
           int error;
   
           label = mac_labelzone_alloc(flag);
           if (label == NULL)
                   return (NULL);
   
           MAC_CHECK(init_ipq_label, label, flag);
           if (error) {
                   MAC_PERFORM(destroy_ipq_label, label);
                   mac_labelzone_free(label);
                   return (NULL);
           }
           return (label);
   }
   
   int
   mac_init_ipq(struct ipq *ipq, int flag)
   {
   
           ipq->ipq_label = mac_ipq_label_alloc(flag);
           if (ipq->ipq_label == NULL)
                   return (ENOMEM);
           return (0);
   }
   
   static void
   mac_inpcb_label_free(struct label *label)
   {
   
           MAC_PERFORM(destroy_inpcb_label, label);
           mac_labelzone_free(label);
   }
   
   void
   mac_destroy_inpcb(struct inpcb *inp)
   {
   
           mac_inpcb_label_free(inp->inp_label);
           inp->inp_label = NULL;
   }
   
   static void
   mac_ipq_label_free(struct label *label)
   {
   
           MAC_PERFORM(destroy_ipq_label, label);
           mac_labelzone_free(label);
   }
   
   void
   mac_destroy_ipq(struct ipq *ipq)
   {
   
           mac_ipq_label_free(ipq->ipq_label);
           ipq->ipq_label = NULL;
   }
   
   void
   mac_create_inpcb_from_socket(struct socket *so, struct inpcb *inp)
   {
   
           MAC_PERFORM(create_inpcb_from_socket, so, so->so_label, inp,
               inp->inp_label);
   }
   
   void
   mac_create_datagram_from_ipq(struct ipq *ipq, struct mbuf *m)
   {
           struct label *label;
   
           label = mac_mbuf_to_label(m);
   
           MAC_PERFORM(create_datagram_from_ipq, ipq, ipq->ipq_label, m, label);
   }
   
   void
   mac_create_fragment(struct mbuf *m, struct mbuf *frag)
   {
           struct label *mlabel, *fraglabel;
   
           mlabel = mac_mbuf_to_label(m);
           fraglabel = mac_mbuf_to_label(frag);
   
           MAC_PERFORM(create_fragment, m, mlabel, frag, fraglabel);
   }
   
   void
   mac_create_ipq(struct mbuf *m, struct ipq *ipq)
   {
           struct label *label;
   
           label = mac_mbuf_to_label(m);
   
           MAC_PERFORM(create_ipq, m, label, ipq, ipq->ipq_label);
   }
   
   void
   mac_create_mbuf_from_inpcb(struct inpcb *inp, struct mbuf *m)
   {
           struct label *mlabel;
   
           INP_LOCK_ASSERT(inp);
           mlabel = mac_mbuf_to_label(m);
   
           MAC_PERFORM(create_mbuf_from_inpcb, inp, inp->inp_label, m, mlabel);
   }
   
   int
   mac_fragment_match(struct mbuf *m, struct ipq *ipq)
   {
           struct label *label;
           int result;
   
           label = mac_mbuf_to_label(m);
   
           result = 1;
           MAC_BOOLEAN(fragment_match, &&, m, label, ipq, ipq->ipq_label);
   
           return (result);
   }
   
   void
   mac_reflect_mbuf_icmp(struct mbuf *m)
   {
           struct label *label;
   
           label = mac_mbuf_to_label(m);
   
           MAC_PERFORM(reflect_mbuf_icmp, m, label);
   }
   
   void
   mac_reflect_mbuf_tcp(struct mbuf *m)
   {
           struct label *label;
   
           label = mac_mbuf_to_label(m);
   
           MAC_PERFORM(reflect_mbuf_tcp, m, label);
   }
   
   void
   mac_update_ipq(struct mbuf *m, struct ipq *ipq)
   {
           struct label *label;
   
           label = mac_mbuf_to_label(m);
   
           MAC_PERFORM(update_ipq, m, label, ipq, ipq->ipq_label);
   }
   
   int
   mac_check_inpcb_deliver(struct inpcb *inp, struct mbuf *m)
   {
           struct label *label;
           int error;
   
           M_ASSERTPKTHDR(m);
   
           label = mac_mbuf_to_label(m);
   
           MAC_CHECK(check_inpcb_deliver, inp, inp->inp_label, m, label);
   
           return (error);
   }
   
   void
   mac_inpcb_sosetlabel(struct socket *so, struct inpcb *inp)
   {
   
           INP_LOCK_ASSERT(inp);
           SOCK_LOCK_ASSERT(so);
           MAC_PERFORM(inpcb_sosetlabel, so, so->so_label, inp, inp->inp_label);
   }
   
   void
   mac_create_mbuf_from_firewall(struct mbuf *m)
   {
           struct label *label;
   
           M_ASSERTPKTHDR(m);
           label = mac_mbuf_to_label(m);
           MAC_PERFORM(create_mbuf_from_firewall, m, label);
   }
   
   /*
    * These functions really should be referencing the syncache structure
    * instead of the label.  However, due to some of the complexities associated
    * with exposing this syncache structure we operate directly on it's label
    * pointer.  This should be OK since we aren't making any access control
    * decisions within this code directly, we are merely allocating and copying
    * label storage so we can properly initialize mbuf labels for any packets
    * the syncache code might create.
    */
   void
   mac_destroy_syncache(struct label **label)
   {
   
           MAC_PERFORM(destroy_syncache_label, *label);
           mac_labelzone_free(*label);
           *label = NULL;
   }
   
   int
   mac_init_syncache(struct label **label)
   {
           int error;
   
           *label = mac_labelzone_alloc(M_NOWAIT);
           if (*label == NULL)
                   return (ENOMEM);
           /*
            * Since we are holding the inpcb locks the policy can not allocate
            * policy specific label storage using M_WAITOK.  So we need to do a
            * MAC_CHECK instead of the typical MAC_PERFORM so we can propagate
            * allocation failures back to the syncache code.
            */
           MAC_CHECK(init_syncache_label, *label, M_NOWAIT);
           return (error);
   }
   
   void
   mac_init_syncache_from_inpcb(struct label *label, struct inpcb *inp)
   {
   
           INP_LOCK_ASSERT(inp);
           MAC_PERFORM(init_syncache_from_inpcb, label, inp);
   }
   
   void
   mac_create_mbuf_from_syncache(struct label *sc_label, struct mbuf *m)
   {
           struct label *mlabel;
   
           M_ASSERTPKTHDR(m);
           mlabel = mac_mbuf_to_label(m);
           MAC_PERFORM(create_mbuf_from_syncache, sc_label, m, mlabel);
   }

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