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, 2007 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  * $FreeBSD$
   35  */
   36 
   37 /*
   38  * Developed by the TrustedBSD Project.
   39  *
   40  * Limit access to interfaces until they are specifically administratively
   41  * enabled.  Prevents protocol stack-driven packet leakage in unsafe
   42  * environments.
   43  */
   44 
   45 #include <sys/param.h>
   46 #include <sys/kernel.h>
   47 #include <sys/module.h>
   48 #include <sys/socket.h>
   49 #include <sys/sysctl.h>
   50 
   51 #include <net/bpfdesc.h>
   52 #include <net/if_types.h>
   53 
   54 #include <security/mac/mac_policy.h>
   55 
   56 SYSCTL_DECL(_security_mac);
   57 
   58 SYSCTL_NODE(_security_mac, OID_AUTO, ifoff, CTLFLAG_RW, 0,
   59     "TrustedBSD mac_ifoff policy controls");
   60 
   61 static int      ifoff_enabled = 1;
   62 SYSCTL_INT(_security_mac_ifoff, OID_AUTO, enabled, CTLFLAG_RW,
   63     &ifoff_enabled, 0, "Enforce ifoff policy");
   64 TUNABLE_INT("security.mac.ifoff.enabled", &ifoff_enabled);
   65 
   66 static int      ifoff_lo_enabled = 1;
   67 SYSCTL_INT(_security_mac_ifoff, OID_AUTO, lo_enabled, CTLFLAG_RW,
   68     &ifoff_lo_enabled, 0, "Enable loopback interfaces");
   69 TUNABLE_INT("security.mac.ifoff.lo_enabled", &ifoff_lo_enabled);
   70 
   71 static int      ifoff_other_enabled = 0;
   72 SYSCTL_INT(_security_mac_ifoff, OID_AUTO, other_enabled, CTLFLAG_RW,
   73     &ifoff_other_enabled, 0, "Enable other interfaces");
   74 TUNABLE_INT("security.mac.ifoff.other_enabled", &ifoff_other_enabled);
   75 
   76 static int      ifoff_bpfrecv_enabled = 0;
   77 SYSCTL_INT(_security_mac_ifoff, OID_AUTO, bpfrecv_enabled, CTLFLAG_RW,
   78     &ifoff_bpfrecv_enabled, 0, "Enable BPF reception even when interface "
   79     "is disabled");
   80 TUNABLE_INT("security.mac.ifoff.bpfrecv.enabled", &ifoff_bpfrecv_enabled);
   81 
   82 static int
   83 check_ifnet_outgoing(struct ifnet *ifp)
   84 {
   85 
   86         if (!ifoff_enabled)
   87                 return (0);
   88 
   89         if (ifoff_lo_enabled && ifp->if_type == IFT_LOOP)
   90                 return (0);
   91 
   92         if (ifoff_other_enabled && ifp->if_type != IFT_LOOP)
   93                 return (0);
   94 
   95         return (EPERM);
   96 }
   97 
   98 static int
   99 check_ifnet_incoming(struct ifnet *ifp, int viabpf)
  100 {
  101         if (!ifoff_enabled)
  102                 return (0);
  103 
  104         if (ifoff_lo_enabled && ifp->if_type == IFT_LOOP)
  105                 return (0);
  106 
  107         if (ifoff_other_enabled && ifp->if_type != IFT_LOOP)
  108                 return (0);
  109 
  110         if (viabpf && ifoff_bpfrecv_enabled)
  111                 return (0);
  112 
  113         return (EPERM);
  114 }
  115 
  116 static int
  117 ifoff_check_bpfdesc_receive(struct bpf_d *d, struct label *dlabel,
  118     struct ifnet *ifp, struct label *ifplabel)
  119 {
  120 
  121         return (check_ifnet_incoming(ifp, 1));
  122 }
  123 
  124 static int
  125 ifoff_check_ifnet_transmit(struct ifnet *ifp, struct label *ifplabel,
  126     struct mbuf *m, struct label *mlabel)
  127 {
  128 
  129         return (check_ifnet_outgoing(ifp));
  130 }
  131 
  132 static int
  133 ifoff_check_inpcb_deliver(struct inpcb *inp, struct label *inplabel,
  134     struct mbuf *m, struct label *mlabel)
  135 {
  136 
  137         M_ASSERTPKTHDR(m);
  138         if (m->m_pkthdr.rcvif != NULL)
  139                 return (check_ifnet_incoming(m->m_pkthdr.rcvif, 0));
  140 
  141         return (0);
  142 }
  143 
  144 static int
  145 ifoff_check_socket_deliver(struct socket *so, struct label *solabel,
  146     struct mbuf *m, struct label *mlabel)
  147 {
  148 
  149         M_ASSERTPKTHDR(m);
  150         if (m->m_pkthdr.rcvif != NULL)
  151                 return (check_ifnet_incoming(m->m_pkthdr.rcvif, 0));
  152 
  153         return (0);
  154 }
  155 
  156 static struct mac_policy_ops ifoff_ops =
  157 {
  158         .mpo_check_bpfdesc_receive = ifoff_check_bpfdesc_receive,
  159         .mpo_check_ifnet_transmit = ifoff_check_ifnet_transmit,
  160         .mpo_check_inpcb_deliver = ifoff_check_inpcb_deliver,
  161         .mpo_check_socket_deliver = ifoff_check_socket_deliver,
  162 };
  163 
  164 MAC_POLICY_SET(&ifoff_ops, mac_ifoff, "TrustedBSD MAC/ifoff",
  165     MPC_LOADTIME_FLAG_UNLOADOK, NULL);

Cache object: fcc46905f7a033fe32b85833b4958826


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