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  * Copyright (c) 2006 SPARTA, Inc.
    5  * All rights reserved.
    6  *
    7  * This software was developed by Robert Watson for the TrustedBSD Project.
    8  *
    9  * This software was developed for the FreeBSD Project in part by Network
   10  * Associates Laboratories, the Security Research Division of Network
   11  * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
   12  * as part of the DARPA CHATS research program.
   13  *
   14  * This software was enhanced by SPARTA ISSO under SPAWAR contract
   15  * N66001-04-C-6019 ("SEFOS").
   16  *
   17  * Redistribution and use in source and binary forms, with or without
   18  * modification, are permitted provided that the following conditions
   19  * are met:
   20  * 1. Redistributions of source code must retain the above copyright
   21  *    notice, this list of conditions and the following disclaimer.
   22  * 2. Redistributions in binary form must reproduce the above copyright
   23  *    notice, this list of conditions and the following disclaimer in the
   24  *    documentation and/or other materials provided with the distribution.
   25  *
   26  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   36  * SUCH DAMAGE.
   37  *
   38  * $FreeBSD: releng/12.0/sys/security/mac_ifoff/mac_ifoff.c 267992 2014-06-28 03:56:17Z hselasky $
   39  */
   40 
   41 /*
   42  * Developed by the TrustedBSD Project.
   43  *
   44  * Limit access to interfaces until they are specifically administratively
   45  * enabled.  Prevents protocol stack-driven packet leakage in unsafe
   46  * environments.
   47  */
   48 
   49 #include <sys/param.h>
   50 #include <sys/kernel.h>
   51 #include <sys/module.h>
   52 #include <sys/mbuf.h>
   53 #include <sys/socket.h>
   54 #include <sys/sysctl.h>
   55 
   56 #include <net/if.h>
   57 #include <net/if_var.h>
   58 #include <net/if_types.h>
   59 #include <net/bpfdesc.h>
   60 
   61 #include <security/mac/mac_policy.h>
   62 
   63 SYSCTL_DECL(_security_mac);
   64 
   65 static SYSCTL_NODE(_security_mac, OID_AUTO, ifoff, CTLFLAG_RW, 0,
   66     "TrustedBSD mac_ifoff policy controls");
   67 
   68 static int      ifoff_enabled = 1;
   69 SYSCTL_INT(_security_mac_ifoff, OID_AUTO, enabled, CTLFLAG_RWTUN,
   70     &ifoff_enabled, 0, "Enforce ifoff policy");
   71 
   72 static int      ifoff_lo_enabled = 1;
   73 SYSCTL_INT(_security_mac_ifoff, OID_AUTO, lo_enabled, CTLFLAG_RWTUN,
   74     &ifoff_lo_enabled, 0, "Enable loopback interfaces");
   75 
   76 static int      ifoff_other_enabled = 0;
   77 SYSCTL_INT(_security_mac_ifoff, OID_AUTO, other_enabled, CTLFLAG_RWTUN,
   78     &ifoff_other_enabled, 0, "Enable other interfaces");
   79 
   80 static int      ifoff_bpfrecv_enabled = 0;
   81 SYSCTL_INT(_security_mac_ifoff, OID_AUTO, bpfrecv_enabled, CTLFLAG_RWTUN,
   82     &ifoff_bpfrecv_enabled, 0, "Enable BPF reception even when interface "
   83     "is disabled");
   84 
   85 static int
   86 ifnet_check_outgoing(struct ifnet *ifp)
   87 {
   88 
   89         if (!ifoff_enabled)
   90                 return (0);
   91 
   92         if (ifoff_lo_enabled && ifp->if_type == IFT_LOOP)
   93                 return (0);
   94 
   95         if (ifoff_other_enabled && ifp->if_type != IFT_LOOP)
   96                 return (0);
   97 
   98         return (EPERM);
   99 }
  100 
  101 static int
  102 ifnet_check_incoming(struct ifnet *ifp, int viabpf)
  103 {
  104         if (!ifoff_enabled)
  105                 return (0);
  106 
  107         if (ifoff_lo_enabled && ifp->if_type == IFT_LOOP)
  108                 return (0);
  109 
  110         if (ifoff_other_enabled && ifp->if_type != IFT_LOOP)
  111                 return (0);
  112 
  113         if (viabpf && ifoff_bpfrecv_enabled)
  114                 return (0);
  115 
  116         return (EPERM);
  117 }
  118 
  119 /*
  120  * Object-specific entry point implementations are sorted alphabetically by
  121  * object type and then by operation.
  122  */
  123 static int
  124 ifoff_bpfdesc_check_receive(struct bpf_d *d, struct label *dlabel,
  125     struct ifnet *ifp, struct label *ifplabel)
  126 {
  127 
  128         return (ifnet_check_incoming(ifp, 1));
  129 }
  130 
  131 static int
  132 ifoff_ifnet_check_transmit(struct ifnet *ifp, struct label *ifplabel,
  133     struct mbuf *m, struct label *mlabel)
  134 {
  135 
  136         return (ifnet_check_outgoing(ifp));
  137 }
  138 
  139 static int
  140 ifoff_inpcb_check_deliver(struct inpcb *inp, struct label *inplabel,
  141     struct mbuf *m, struct label *mlabel)
  142 {
  143 
  144         M_ASSERTPKTHDR(m);
  145         if (m->m_pkthdr.rcvif != NULL)
  146                 return (ifnet_check_incoming(m->m_pkthdr.rcvif, 0));
  147 
  148         return (0);
  149 }
  150 
  151 static int
  152 ifoff_socket_check_deliver(struct socket *so, struct label *solabel,
  153     struct mbuf *m, struct label *mlabel)
  154 {
  155 
  156         M_ASSERTPKTHDR(m);
  157         if (m->m_pkthdr.rcvif != NULL)
  158                 return (ifnet_check_incoming(m->m_pkthdr.rcvif, 0));
  159 
  160         return (0);
  161 }
  162 
  163 static struct mac_policy_ops ifoff_ops =
  164 {
  165         .mpo_bpfdesc_check_receive = ifoff_bpfdesc_check_receive,
  166         .mpo_ifnet_check_transmit = ifoff_ifnet_check_transmit,
  167         .mpo_inpcb_check_deliver = ifoff_inpcb_check_deliver,
  168         .mpo_socket_check_deliver = ifoff_socket_check_deliver,
  169 };
  170 
  171 MAC_POLICY_SET(&ifoff_ops, mac_ifoff, "TrustedBSD MAC/ifoff",
  172     MPC_LOADTIME_FLAG_UNLOADOK, NULL);

Cache object: da8e3744cea03db74bf6104a4c5b658c


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