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

     /*
      * Copyright (c) 2007-2011 Apple Inc. All rights reserved.
      *
      * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
      * 
      * This file contains Original Code and/or Modifications of Original Code
      * as defined in and that are subject to the Apple Public Source License
      * Version 2.0 (the 'License'). You may not use this file except in
      * compliance with the License. The rights granted to you under the License
     * may not be used to create, or enable the creation or redistribution of,
     * unlawful or unlicensed copies of an Apple operating system, or to
     * circumvent, violate, or enable the circumvention or violation of, any
     * terms of an Apple operating system software license agreement.
     * 
     * Please obtain a copy of the License at
     * http://www.opensource.apple.com/apsl/ and read it before using this file.
     * 
     * The Original Code and all software distributed under the License are
     * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
     * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
     * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
     * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
     * Please see the License for the specific language governing rights and
     * limitations under the License.
     * 
     * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
     */
    /*-
     * Copyright (c) 1999-2002 Robert N. M. Watson
     * Copyright (c) 2001 Ilmar S. Habibulin
     * Copyright (c) 2001-2004 Networks Associates Technology, Inc.
     * Copyright (c) 2006-2007 SPARTA, 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.
     *
     * This software was enhanced by SPARTA ISSO under SPAWAR contract
     * N66001-04-C-6019 ("SEFOS").
     *
     * 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/param.h>
    #include <sys/kernel.h>
    #include <sys/mbuf.h>
    #include <sys/socket.h>
    #include <sys/socketvar.h>
    
    #include <net/route.h>
    
    #include <netinet/in.h>
    #include <netinet/in_pcb.h>
    #include <netinet/ip_var.h>
    
    #include <security/mac_internal.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(inpcb_label_init, label, flag);
            if (error) {
                    MAC_PERFORM(inpcb_label_destroy, label);
                    mac_labelzone_free(label);
                    return (NULL);
            }
            return (label);
    }
    
   int
   mac_inpcb_label_init(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(ipq_label_init, label, flag);
           if (error) {
                   MAC_PERFORM(ipq_label_destroy, label);
                   mac_labelzone_free(label);
                   return (NULL);
           }
           return (label);
   }
   
   int
   mac_ipq_label_init(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(inpcb_label_destroy, label);
           mac_labelzone_free(label);
   }
   
   void
   mac_inpcb_label_destroy(struct inpcb *inp)
   {
   
           mac_inpcb_label_free(inp->inp_label);
           inp->inp_label = NULL;
   }
   
   void
   mac_inpcb_label_recycle(struct inpcb *inp)
   {
   
           MAC_PERFORM(inpcb_label_recycle, inp->inp_label);
   }
   
   static void
   mac_ipq_label_free(struct label *label)
   {
   
           MAC_PERFORM(ipq_label_destroy, label);
           mac_labelzone_free(label);
   }
   
   void
   mac_ipq_label_destroy(struct ipq *ipq)
   {
   
           mac_ipq_label_free(ipq->ipq_label);
           ipq->ipq_label = NULL;
   }
   
   void
   mac_inpcb_label_associate(struct socket *so, struct inpcb *inp)
   {
   
           MAC_PERFORM(inpcb_label_associate, so, so->so_label, inp,
               inp->inp_label);
   }
   
   void
   mac_mbuf_label_associate_ipq(struct ipq *ipq, struct mbuf *m)
   {
           struct label *label;
   
           label = mac_mbuf_to_label(m);
   
           MAC_PERFORM(mbuf_label_associate_ipq, ipq, ipq->ipq_label, m, label);
   }
   
   void
   mac_netinet_fragment(struct mbuf *datagram, struct mbuf *fragment)
   {
           struct label *datagramlabel, *fragmentlabel;
   
           datagramlabel = mac_mbuf_to_label(datagram);
           fragmentlabel = mac_mbuf_to_label(fragment);
   
           MAC_PERFORM(netinet_fragment, datagram, datagramlabel, fragment,
               fragmentlabel);
   }
   
   void
   mac_ipq_label_associate(struct mbuf *fragment, struct ipq *ipq)
   {
           struct label *label;
   
           label = mac_mbuf_to_label(fragment);
   
           MAC_PERFORM(ipq_label_associate, fragment, label, ipq, ipq->ipq_label);
   }
   
   void
   mac_mbuf_label_associate_inpcb(struct inpcb *inp, struct mbuf *m)
   {
           struct label *mlabel;
   
           /* INP_LOCK_ASSERT(inp); */
           mlabel = mac_mbuf_to_label(m);
   
           MAC_PERFORM(mbuf_label_associate_inpcb, inp, inp->inp_label, m, mlabel);
   }
   
   int
   mac_ipq_label_compare(struct mbuf *fragment, struct ipq *ipq)
   {
           struct label *label;
           int result;
   
           label = mac_mbuf_to_label(fragment);
   
           result = 1;
           MAC_BOOLEAN(ipq_label_compare, &&, fragment, label, ipq, ipq->ipq_label);
   
           return (result);
   }
   
   void
   mac_netinet_icmp_reply(struct mbuf *m)
   {
           struct label *label;
   
           label = mac_mbuf_to_label(m);
   
           MAC_PERFORM(netinet_icmp_reply, m, label);
   }
   
   void
   mac_netinet_tcp_reply(struct mbuf *m)
   {
           struct label *label;
   
           label = mac_mbuf_to_label(m);
   
           MAC_PERFORM(netinet_tcp_reply, m, label);
   }
   
   void
   mac_ipq_label_update(struct mbuf *fragment, struct ipq *ipq)
   {
           struct label *label;
   
           label = mac_mbuf_to_label(fragment);
   
           MAC_PERFORM(ipq_label_update, fragment, label, ipq, ipq->ipq_label);
   }
   
   int
   mac_inpcb_check_deliver(struct inpcb *inp, struct mbuf *m, int family, int type)
   {
           struct label *label;
           int error;
   
           if ((m->m_flags & M_PKTHDR) == 0)
                   panic("%s: no mbuf packet header!", __func__);
   
           label = mac_mbuf_to_label(m);
   
           MAC_CHECK(inpcb_check_deliver, inp, inp->inp_label, m, label,
               family, type);
   
           return (error);
   }
   
   /*
    * Propagate a change in the socket label to the inpcb label.
    */
   void
   mac_inpcb_label_update(struct socket *so)
   {
           struct inpcb *inp;
   
           /* XXX: assert socket lock. */
           inp = sotoinpcb(so);    /* XXX: inp locking */
   
           if (inp != NULL) {
                   /* INP_LOCK_ASSERT(inp); */
                   MAC_PERFORM(inpcb_label_update, so, so->so_label, inp,
                       inp->inp_label);
           }
   }

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