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