167 lines
5.1 KiB
C
167 lines
5.1 KiB
C
/*-
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* Copyright (c) 1999, 2000, 2001, 2002 Robert N. M. Watson
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* Copyright (c) 2001, 2002 Networks Associates Technology, 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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* 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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* 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/types.h>
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#include <sys/param.h>
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#include <sys/conf.h>
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#include <sys/kernel.h>
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#include <sys/mac.h>
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#include <sys/mount.h>
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#include <sys/proc.h>
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#include <sys/systm.h>
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#include <sys/sysproto.h>
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#include <sys/sysent.h>
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#include <sys/vnode.h>
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#include <sys/file.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/sysctl.h>
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#include <net/bpfdesc.h>
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#include <net/if.h>
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#include <net/if_types.h>
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#include <net/if_var.h>
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#include <vm/vm.h>
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#include <sys/mac_policy.h>
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SYSCTL_DECL(_security_mac);
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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 mac_ifoff_enabled = 1;
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SYSCTL_INT(_security_mac_ifoff, OID_AUTO, enabled, CTLFLAG_RW,
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&mac_ifoff_enabled, 0, "Enforce ifoff policy");
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TUNABLE_INT("security.mac.ifoff.enabled", &mac_ifoff_enabled);
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static int mac_ifoff_lo_enabled = 1;
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SYSCTL_INT(_security_mac_ifoff, OID_AUTO, lo_enabled, CTLFLAG_RW,
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&mac_ifoff_lo_enabled, 0, "Enable loopback interfaces");
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TUNABLE_INT("security.mac.ifoff.lo_enabled", &mac_ifoff_lo_enabled);
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static int mac_ifoff_other_enabled = 0;
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SYSCTL_INT(_security_mac_ifoff, OID_AUTO, other_enabled, CTLFLAG_RW,
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&mac_ifoff_other_enabled, 0, "Enable other interfaces");
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TUNABLE_INT("security.mac.ifoff.other_enabled", &mac_ifoff_other_enabled);
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static int mac_ifoff_bpfrecv_enabled = 0;
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SYSCTL_INT(_security_mac_ifoff, OID_AUTO, bpfrecv_enabled, CTLFLAG_RW,
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&mac_ifoff_bpfrecv_enabled, 0, "Enable BPF reception even when interface "
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"is disabled");
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TUNABLE_INT("security.mac.ifoff.bpfrecv.enabled", &mac_ifoff_bpfrecv_enabled);
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static int
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check_ifnet_outgoing(struct ifnet *ifnet)
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{
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if (!mac_ifoff_enabled)
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return (0);
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if (mac_ifoff_lo_enabled && ifnet->if_type == IFT_LOOP)
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return (0);
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if (mac_ifoff_other_enabled && ifnet->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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check_ifnet_incoming(struct ifnet *ifnet, int viabpf)
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{
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if (!mac_ifoff_enabled)
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return (0);
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if (mac_ifoff_lo_enabled && ifnet->if_type == IFT_LOOP)
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return (0);
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if (mac_ifoff_other_enabled && ifnet->if_type != IFT_LOOP)
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return (0);
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if (viabpf && mac_ifoff_bpfrecv_enabled)
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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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mac_ifoff_check_bpfdesc_receive(struct bpf_d *bpf_d, struct label *bpflabel,
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struct ifnet *ifnet, struct label *ifnetlabel)
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{
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return (check_ifnet_incoming(ifnet, 1));
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}
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static int
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mac_ifoff_check_ifnet_transmit(struct ifnet *ifnet, struct label *ifnetlabel,
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struct mbuf *m, struct label *mbuflabel)
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{
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return (check_ifnet_outgoing(ifnet));
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}
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static int
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mac_ifoff_check_socket_deliver(struct socket *so, struct label *socketlabel,
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struct mbuf *m, struct label *mbuflabel)
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{
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if (m->m_flags & M_PKTHDR) {
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if (m->m_pkthdr.rcvif != NULL)
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return (check_ifnet_incoming(m->m_pkthdr.rcvif, 0));
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}
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return (0);
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}
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static struct mac_policy_ops mac_ifoff_ops =
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{
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.mpo_check_bpfdesc_receive = mac_ifoff_check_bpfdesc_receive,
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.mpo_check_ifnet_transmit = mac_ifoff_check_ifnet_transmit,
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.mpo_check_socket_deliver = mac_ifoff_check_socket_deliver,
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};
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MAC_POLICY_SET(&mac_ifoff_ops, trustedbsd_mac_ifoff, "TrustedBSD MAC/ifoff",
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MPC_LOADTIME_FLAG_UNLOADOK, NULL);
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