The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*-
    2  * Copyright (c) 1999-2002 Robert N. M. Watson
    3  * Copyright (c) 2001-2002 Networks Associates Technology, Inc.
    4  * All rights reserved.
    5  *
    6  * This software was developed by Robert Watson for the TrustedBSD Project.
    7  *
    8  * This software was developed for the FreeBSD Project in part by Network
    9  * Associates Laboratories, the Security Research Division of Network
   10  * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
   11  * as part of the DARPA CHATS research program.
   12  *
   13  * Redistribution and use in source and binary forms, with or without
   14  * modification, are permitted provided that the following conditions
   15  * are met:
   16  * 1. Redistributions of source code must retain the above copyright
   17  *    notice, this list of conditions and the following disclaimer.
   18  * 2. Redistributions in binary form must reproduce the above copyright
   19  *    notice, this list of conditions and the following disclaimer in the
   20  *    documentation and/or other materials provided with the distribution.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  * $FreeBSD: releng/6.2/sys/security/mac_ifoff/mac_ifoff.c 126097 2004-02-22 00:33:12Z rwatson $
   35  */
   36 
   37 /*
   38  * Developed by the TrustedBSD Project.
   39  * Limit access to interfaces until they are specifically administratively
   40  * enabled.  Prevents protocol stack-driven packet leakage in unsafe
   41  * environments.
   42  */
   43 
   44 #include <sys/types.h>
   45 #include <sys/param.h>
   46 #include <sys/conf.h>
   47 #include <sys/kernel.h>
   48 #include <sys/mac.h>
   49 #include <sys/mount.h>
   50 #include <sys/proc.h>
   51 #include <sys/systm.h>
   52 #include <sys/sysproto.h>
   53 #include <sys/sysent.h>
   54 #include <sys/vnode.h>
   55 #include <sys/file.h>
   56 #include <sys/socket.h>
   57 #include <sys/socketvar.h>
   58 #include <sys/sysctl.h>
   59 
   60 #include <net/bpfdesc.h>
   61 #include <net/if.h>
   62 #include <net/if_types.h>
   63 #include <net/if_var.h>
   64 
   65 #include <vm/vm.h>
   66 
   67 #include <sys/mac_policy.h>
   68 
   69 SYSCTL_DECL(_security_mac);
   70 
   71 SYSCTL_NODE(_security_mac, OID_AUTO, ifoff, CTLFLAG_RW, 0,
   72     "TrustedBSD mac_ifoff policy controls");
   73 
   74 static int      mac_ifoff_enabled = 1;
   75 SYSCTL_INT(_security_mac_ifoff, OID_AUTO, enabled, CTLFLAG_RW,
   76     &mac_ifoff_enabled, 0, "Enforce ifoff policy");
   77 TUNABLE_INT("security.mac.ifoff.enabled", &mac_ifoff_enabled);
   78 
   79 static int      mac_ifoff_lo_enabled = 1;
   80 SYSCTL_INT(_security_mac_ifoff, OID_AUTO, lo_enabled, CTLFLAG_RW,
   81     &mac_ifoff_lo_enabled, 0, "Enable loopback interfaces");
   82 TUNABLE_INT("security.mac.ifoff.lo_enabled", &mac_ifoff_lo_enabled);
   83 
   84 static int      mac_ifoff_other_enabled = 0;
   85 SYSCTL_INT(_security_mac_ifoff, OID_AUTO, other_enabled, CTLFLAG_RW,
   86     &mac_ifoff_other_enabled, 0, "Enable other interfaces");
   87 TUNABLE_INT("security.mac.ifoff.other_enabled", &mac_ifoff_other_enabled);
   88 
   89 static int      mac_ifoff_bpfrecv_enabled = 0;
   90 SYSCTL_INT(_security_mac_ifoff, OID_AUTO, bpfrecv_enabled, CTLFLAG_RW,
   91     &mac_ifoff_bpfrecv_enabled, 0, "Enable BPF reception even when interface "
   92     "is disabled");
   93 TUNABLE_INT("security.mac.ifoff.bpfrecv.enabled", &mac_ifoff_bpfrecv_enabled);
   94 
   95 static int
   96 check_ifnet_outgoing(struct ifnet *ifnet)
   97 {
   98 
   99         if (!mac_ifoff_enabled)
  100                 return (0);
  101 
  102         if (mac_ifoff_lo_enabled && ifnet->if_type == IFT_LOOP)
  103                 return (0);
  104 
  105         if (mac_ifoff_other_enabled && ifnet->if_type != IFT_LOOP)
  106                 return (0);
  107 
  108         return (EPERM);
  109 }
  110 
  111 static int
  112 check_ifnet_incoming(struct ifnet *ifnet, int viabpf)
  113 {
  114         if (!mac_ifoff_enabled)
  115                 return (0);
  116 
  117         if (mac_ifoff_lo_enabled && ifnet->if_type == IFT_LOOP)
  118                 return (0);
  119 
  120         if (mac_ifoff_other_enabled && ifnet->if_type != IFT_LOOP)
  121                 return (0);
  122 
  123         if (viabpf && mac_ifoff_bpfrecv_enabled)
  124                 return (0);
  125 
  126         return (EPERM);
  127 }
  128 
  129 static int
  130 mac_ifoff_check_bpfdesc_receive(struct bpf_d *bpf_d, struct label *bpflabel,
  131     struct ifnet *ifnet, struct label *ifnetlabel)
  132 {
  133 
  134         return (check_ifnet_incoming(ifnet, 1));
  135 }
  136 
  137 static int
  138 mac_ifoff_check_ifnet_transmit(struct ifnet *ifnet, struct label *ifnetlabel,
  139     struct mbuf *m, struct label *mbuflabel)
  140 {
  141 
  142         return (check_ifnet_outgoing(ifnet));
  143 }
  144 
  145 static int
  146 mac_ifoff_check_inpcb_deliver(struct inpcb *inp, struct label *inplabel,
  147     struct mbuf *m, struct label *mlabel)
  148 {
  149 
  150         M_ASSERTPKTHDR(m);
  151         if (m->m_pkthdr.rcvif != NULL)
  152                 return (check_ifnet_incoming(m->m_pkthdr.rcvif, 0));
  153 
  154         return (0);
  155 }
  156 
  157 static int
  158 mac_ifoff_check_socket_deliver(struct socket *so, struct label *socketlabel,
  159     struct mbuf *m, struct label *mbuflabel)
  160 {
  161 
  162         M_ASSERTPKTHDR(m);
  163         if (m->m_pkthdr.rcvif != NULL)
  164                 return (check_ifnet_incoming(m->m_pkthdr.rcvif, 0));
  165 
  166         return (0);
  167 }
  168 
  169 static struct mac_policy_ops mac_ifoff_ops =
  170 {
  171         .mpo_check_bpfdesc_receive = mac_ifoff_check_bpfdesc_receive,
  172         .mpo_check_ifnet_transmit = mac_ifoff_check_ifnet_transmit,
  173         .mpo_check_inpcb_deliver = mac_ifoff_check_inpcb_deliver,
  174         .mpo_check_socket_deliver = mac_ifoff_check_socket_deliver,
  175 };
  176 
  177 MAC_POLICY_SET(&mac_ifoff_ops, mac_ifoff, "TrustedBSD MAC/ifoff",
  178     MPC_LOADTIME_FLAG_UNLOADOK, NULL);

Cache object: b39c087be7fcb483faa4e42469a2619d


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