173 lines
5.0 KiB
C
173 lines
5.0 KiB
C
/*-
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* Copyright (c) 1999-2002, 2007 Robert N. M. Watson
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* Copyright (c) 2001-2002 Networks Associates Technology, Inc.
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* Copyright (c) 2006 SPARTA, Inc.
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* All rights reserved.
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*
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* This software was developed by Robert Watson for the TrustedBSD Project.
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*
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* This software was developed for the FreeBSD Project in part by Network
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* Associates Laboratories, the Security Research Division of Network
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* Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
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* as part of the DARPA CHATS research program.
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*
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* This software was enhanced by SPARTA ISSO under SPAWAR contract
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* N66001-04-C-6019 ("SEFOS").
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* Developed by the TrustedBSD Project.
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*
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* Limit access to interfaces until they are specifically administratively
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* enabled. Prevents protocol stack-driven packet leakage in unsafe
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* environments.
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*/
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/sysctl.h>
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#include <net/if.h>
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#include <net/if_var.h>
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#include <net/if_types.h>
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#include <net/bpfdesc.h>
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#include <security/mac/mac_policy.h>
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SYSCTL_DECL(_security_mac);
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static SYSCTL_NODE(_security_mac, OID_AUTO, ifoff, CTLFLAG_RW, 0,
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"TrustedBSD mac_ifoff policy controls");
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static int ifoff_enabled = 1;
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SYSCTL_INT(_security_mac_ifoff, OID_AUTO, enabled, CTLFLAG_RWTUN,
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&ifoff_enabled, 0, "Enforce ifoff policy");
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static int ifoff_lo_enabled = 1;
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SYSCTL_INT(_security_mac_ifoff, OID_AUTO, lo_enabled, CTLFLAG_RWTUN,
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&ifoff_lo_enabled, 0, "Enable loopback interfaces");
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static int ifoff_other_enabled = 0;
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SYSCTL_INT(_security_mac_ifoff, OID_AUTO, other_enabled, CTLFLAG_RWTUN,
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&ifoff_other_enabled, 0, "Enable other interfaces");
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static int ifoff_bpfrecv_enabled = 0;
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SYSCTL_INT(_security_mac_ifoff, OID_AUTO, bpfrecv_enabled, CTLFLAG_RWTUN,
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&ifoff_bpfrecv_enabled, 0, "Enable BPF reception even when interface "
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"is disabled");
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static int
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ifnet_check_outgoing(struct ifnet *ifp)
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{
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if (!ifoff_enabled)
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return (0);
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if (ifoff_lo_enabled && ifp->if_type == IFT_LOOP)
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return (0);
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if (ifoff_other_enabled && ifp->if_type != IFT_LOOP)
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return (0);
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return (EPERM);
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}
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static int
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ifnet_check_incoming(struct ifnet *ifp, int viabpf)
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{
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if (!ifoff_enabled)
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return (0);
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if (ifoff_lo_enabled && ifp->if_type == IFT_LOOP)
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return (0);
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if (ifoff_other_enabled && ifp->if_type != IFT_LOOP)
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return (0);
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if (viabpf && ifoff_bpfrecv_enabled)
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return (0);
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return (EPERM);
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}
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/*
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* Object-specific entry point implementations are sorted alphabetically by
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* object type and then by operation.
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*/
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static int
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ifoff_bpfdesc_check_receive(struct bpf_d *d, struct label *dlabel,
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struct ifnet *ifp, struct label *ifplabel)
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{
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return (ifnet_check_incoming(ifp, 1));
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}
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static int
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ifoff_ifnet_check_transmit(struct ifnet *ifp, struct label *ifplabel,
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struct mbuf *m, struct label *mlabel)
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{
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return (ifnet_check_outgoing(ifp));
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}
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static int
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ifoff_inpcb_check_deliver(struct inpcb *inp, struct label *inplabel,
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struct mbuf *m, struct label *mlabel)
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{
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M_ASSERTPKTHDR(m);
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if (m->m_pkthdr.rcvif != NULL)
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return (ifnet_check_incoming(m->m_pkthdr.rcvif, 0));
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return (0);
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}
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static int
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ifoff_socket_check_deliver(struct socket *so, struct label *solabel,
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struct mbuf *m, struct label *mlabel)
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{
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M_ASSERTPKTHDR(m);
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if (m->m_pkthdr.rcvif != NULL)
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return (ifnet_check_incoming(m->m_pkthdr.rcvif, 0));
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return (0);
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}
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static struct mac_policy_ops ifoff_ops =
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{
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.mpo_bpfdesc_check_receive = ifoff_bpfdesc_check_receive,
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.mpo_ifnet_check_transmit = ifoff_ifnet_check_transmit,
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.mpo_inpcb_check_deliver = ifoff_inpcb_check_deliver,
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.mpo_socket_check_deliver = ifoff_socket_check_deliver,
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};
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MAC_POLICY_SET(&ifoff_ops, mac_ifoff, "TrustedBSD MAC/ifoff",
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MPC_LOADTIME_FLAG_UNLOADOK, NULL);
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