1110476Strhodes#!/bin/sh - 266830Sobrien# Copyright (c) 1996 Poul-Henning Kamp 366830Sobrien# All rights reserved. 466830Sobrien# 566830Sobrien# Redistribution and use in source and binary forms, with or without 666830Sobrien# modification, are permitted provided that the following conditions 766830Sobrien# are met: 866830Sobrien# 1. Redistributions of source code must retain the above copyright 966830Sobrien# notice, this list of conditions and the following disclaimer. 1066830Sobrien# 2. Redistributions in binary form must reproduce the above copyright 1166830Sobrien# notice, this list of conditions and the following disclaimer in the 1266830Sobrien# documentation and/or other materials provided with the distribution. 1366830Sobrien# 1466830Sobrien# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 1566830Sobrien# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1666830Sobrien# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 1766830Sobrien# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 1866830Sobrien# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 1966830Sobrien# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2066830Sobrien# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2166830Sobrien# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2266830Sobrien# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2366830Sobrien# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2466830Sobrien# SUCH DAMAGE. 2566830Sobrien# 2650472Speter# $FreeBSD: stable/11/etc/rc.firewall 331728 2018-03-29 04:51:07Z araujo $ 2766830Sobrien# 2815027Sphk 2966830Sobrien# 30168384Srwatson# Setup system for ipfw(4) firewall service. 3166830Sobrien# 3266830Sobrien 3343849Sjkh# Suck in the configuration variables. 3481618Sddif [ -z "${source_rc_confs_defined}" ]; then 3581618Sdd if [ -r /etc/defaults/rc.conf ]; then 3681618Sdd . /etc/defaults/rc.conf 3781618Sdd source_rc_confs 3881618Sdd elif [ -r /etc/rc.conf ]; then 3981618Sdd . /etc/rc.conf 4081618Sdd fi 4133203Sadamfi 4233203Sadam 4315027Sphk############ 4429300Sdanny# Define the firewall type in /etc/rc.conf. Valid values are: 45163749Sphk# open - will allow anyone in 46163749Sphk# client - will try to protect just this machine 47163749Sphk# simple - will try to protect a whole network 48163749Sphk# closed - totally disables IP services except via lo0 interface 49229783Suqs# workstation - will try to protect just this machine using stateful 50163749Sphk# firewalling. See below for rc.conf variables used 51163749Sphk# UNKNOWN - disables the loading of firewall rules. 52163749Sphk# filename - will load the rules in the given filename (full path required) 5315027Sphk# 5451231Ssheldonh# For ``client'' and ``simple'' the entries below should be customized 5529300Sdanny# appropriately. 5615027Sphk 5715027Sphk############ 5815027Sphk# 5915027Sphk# If you don't know enough about packet filtering, we suggest that you 6015027Sphk# take time to read this book: 6115027Sphk# 6273023Sdes# Building Internet Firewalls, 2nd Edition 6315210Sphk# Brent Chapman and Elizabeth Zwicky 6415210Sphk# 6515210Sphk# O'Reilly & Associates, Inc 6673023Sdes# ISBN 1-56592-871-7 6725478Sjkh# http://www.ora.com/ 6873023Sdes# http://www.oreilly.com/catalog/fire2/ 6915210Sphk# 7015210Sphk# For a more advanced treatment of Internet Security read: 7115210Sphk# 72175244Smaxim# Firewalls and Internet Security: Repelling the Wily Hacker, 2nd Edition 73175244Smaxim# William R. Cheswick, Steven M. Bellowin, Aviel D. Rubin 7415027Sphk# 75175244Smaxim# Addison-Wesley / Prentice Hall 76175244Smaxim# ISBN 0-201-63466-X 77175244Smaxim# http://www.pearsonhighered.com/ 78175244Smaxim# http://www.pearsonhighered.com/educator/academic/product/0,3110,020163466X,00.html 7915027Sphk# 8015027Sphk 81238416Skevlosetup_loopback() { 8291019Scjc ############ 8391019Scjc # Only in rare cases do you want to change these rules 8491019Scjc # 8591019Scjc ${fwcmd} add 100 pass all from any to any via lo0 8691019Scjc ${fwcmd} add 200 deny all from any to 127.0.0.0/8 8791019Scjc ${fwcmd} add 300 deny ip from 127.0.0.0/8 to any 88200028Sume if [ $ipv6_available -eq 0 ]; then 89200028Sume ${fwcmd} add 400 deny all from any to ::1 90200028Sume ${fwcmd} add 500 deny all from ::1 to any 91200028Sume fi 9291019Scjc} 9391019Scjc 94238416Skevlosetup_ipv6_mandatory() { 95200028Sume [ $ipv6_available -eq 0 ] || return 0 96200028Sume 97200028Sume ############ 98200028Sume # Only in rare cases do you want to change these rules 99200028Sume # 100200028Sume # ND 101200028Sume # 102200028Sume # DAD 103200028Sume ${fwcmd} add pass ipv6-icmp from :: to ff02::/16 104200028Sume # RS, RA, NS, NA, redirect... 105200028Sume ${fwcmd} add pass ipv6-icmp from fe80::/10 to fe80::/10 106200028Sume ${fwcmd} add pass ipv6-icmp from fe80::/10 to ff02::/16 107200028Sume 108229783Suqs # Allow ICMPv6 destination unreachable 109200028Sume ${fwcmd} add pass ipv6-icmp from any to any icmp6types 1 110200028Sume 111200028Sume # Allow NS/NA/toobig (don't filter it out) 112200028Sume ${fwcmd} add pass ipv6-icmp from any to any icmp6types 2,135,136 113200028Sume} 114200028Sume 115331728Saraujo. /etc/rc.subr 116331728Saraujo. /etc/network.subr 117331728Saraujo 11851231Ssheldonhif [ -n "${1}" ]; then 11951231Ssheldonh firewall_type="${1}" 12029300Sdannyfi 121331728Saraujoif [ -z "${firewall_rc_config_load}" ]; then 122331728Saraujo load_rc_config ipfw 123331728Saraujoelse 124331728Saraujo for i in ${firewall_rc_config_load}; do 125331728Saraujo load_rc_config $i 126331728Saraujo done 127331728Saraujofi 12829300Sdanny 129200028Sumeafexists inet6 130200028Sumeipv6_available=$? 131200028Sume 13215027Sphk############ 13329300Sdanny# Set quiet mode if requested 13451231Ssheldonh# 13551231Ssheldonhcase ${firewall_quiet} in 13651231Ssheldonh[Yy][Ee][Ss]) 13729300Sdanny fwcmd="/sbin/ipfw -q" 13851231Ssheldonh ;; 13951231Ssheldonh*) 14029300Sdanny fwcmd="/sbin/ipfw" 14151231Ssheldonh ;; 14251231Ssheldonhesac 14329300Sdanny 14429300Sdanny############ 14516578Salex# Flush out the list before we begin. 14651231Ssheldonh# 14750357Ssheldonh${fwcmd} -f flush 14816578Salex 149163749Sphksetup_loopback 150200028Sumesetup_ipv6_mandatory 151163749Sphk 15216578Salex############ 15364244Sru# Network Address Translation. All packets are passed to natd(8) 15464244Sru# before they encounter your remaining rules. The firewall rules 15564244Sru# will then be run again on each packet after translation by natd 15664244Sru# starting at the rule number following the divert rule. 15751231Ssheldonh# 15864244Sru# For ``simple'' firewall type the divert rule should be put to a 15964244Sru# different place to not interfere with address-checking rules. 16073842Sobrien# 16164244Srucase ${firewall_type} in 16265257Sru[Oo][Pp][Ee][Nn]|[Cc][Ll][Ii][Ee][Nn][Tt]) 16364244Sru case ${natd_enable} in 16464244Sru [Yy][Ee][Ss]) 16564244Sru if [ -n "${natd_interface}" ]; then 166152562Sume ${fwcmd} add 50 divert natd ip4 from any to any via ${natd_interface} 16764244Sru fi 16864244Sru ;; 16964244Sru esac 170165648Spiso case ${firewall_nat_enable} in 171165648Spiso [Yy][Ee][Ss]) 172165648Spiso if [ -n "${firewall_nat_interface}" ]; then 173175522Srafan if echo "${firewall_nat_interface}" | \ 174175522Srafan grep -q -E '^[0-9]+(\.[0-9]+){0,3}$'; then 175175522Srafan firewall_nat_flags="ip ${firewall_nat_interface} ${firewall_nat_flags}" 176175522Srafan else 177175522Srafan firewall_nat_flags="if ${firewall_nat_interface} ${firewall_nat_flags}" 178175522Srafan fi 179175522Srafan ${fwcmd} nat 123 config log ${firewall_nat_flags} 180165648Spiso ${fwcmd} add 50 nat 123 ip4 from any to any via ${firewall_nat_interface} 181165648Spiso fi 182165648Spiso ;; 183165648Spiso esac 18451231Ssheldonhesac 18535267Sbrian 18635267Sbrian############ 18715027Sphk# If you just configured ipfw in the kernel as a tool to solve network 18815027Sphk# problems or you just want to disallow some particular kinds of traffic 18951805Smpp# then you will want to change the default policy to open. You can also 19017594Sjkh# do this as your only action by setting the firewall_type to ``open''. 19151231Ssheldonh# 19250357Ssheldonh# ${fwcmd} add 65000 pass all from any to any 19315027Sphk 19415027Sphk 19517594Sjkh# Prototype setups. 19651231Ssheldonh# 19751231Ssheldonhcase ${firewall_type} in 19851231Ssheldonh[Oo][Pp][Ee][Nn]) 19950357Ssheldonh ${fwcmd} add 65000 pass all from any to any 20051231Ssheldonh ;; 20154108Sobrien 20251231Ssheldonh[Cc][Ll][Ii][Ee][Nn][Tt]) 20351231Ssheldonh ############ 20451231Ssheldonh # This is a prototype setup that will protect your system somewhat 20551231Ssheldonh # against people from outside your own network. 206181762Sjhb # 207181762Sjhb # Configuration: 208200028Sume # firewall_client_net: Network address of local IPv4 network. 209200028Sume # firewall_client_net_ipv6: Network address of local IPv6 network. 21051231Ssheldonh ############ 21129300Sdanny 212181762Sjhb # set this to your local network 213181762Sjhb net="$firewall_client_net" 214200028Sume net6="$firewall_client_net_ipv6" 21517594Sjkh 216179598Skeramida # Allow limited broadcast traffic from my own net. 217181761Sjhb ${fwcmd} add pass all from ${net} to 255.255.255.255 218179598Skeramida 21951231Ssheldonh # Allow any traffic to or from my own net. 220181761Sjhb ${fwcmd} add pass all from me to ${net} 221181761Sjhb ${fwcmd} add pass all from ${net} to me 222200028Sume if [ -n "$net6" ]; then 223202460Sume ${fwcmd} add pass all from me to ${net6} 224202460Sume ${fwcmd} add pass all from ${net6} to me 225200028Sume fi 22615027Sphk 227200028Sume if [ -n "$net6" ]; then 228200028Sume # Allow any link-local multicast traffic 229200028Sume ${fwcmd} add pass all from fe80::/10 to ff02::/16 230200028Sume ${fwcmd} add pass all from ${net6} to ff02::/16 231201930Sume # Allow DHCPv6 232202460Sume ${fwcmd} add pass udp from fe80::/10 to me 546 233200028Sume fi 234200028Sume 23551231Ssheldonh # Allow TCP through if setup succeeded 23651231Ssheldonh ${fwcmd} add pass tcp from any to any established 23715027Sphk 23852873Sru # Allow IP fragments to pass through 23952873Sru ${fwcmd} add pass all from any to any frag 24052873Sru 24151231Ssheldonh # Allow setup of incoming email 242163749Sphk ${fwcmd} add pass tcp from any to me 25 setup 24315027Sphk 24451231Ssheldonh # Allow setup of outgoing TCP connections only 245163749Sphk ${fwcmd} add pass tcp from me to any setup 24615027Sphk 24751231Ssheldonh # Disallow setup of all other TCP connections 24851231Ssheldonh ${fwcmd} add deny tcp from any to any setup 24915027Sphk 25051231Ssheldonh # Allow DNS queries out in the world 251163749Sphk ${fwcmd} add pass udp from me to any 53 keep-state 25215027Sphk 25351231Ssheldonh # Allow NTP queries out in the world 254163749Sphk ${fwcmd} add pass udp from me to any 123 keep-state 25515027Sphk 25651231Ssheldonh # Everything else is denied by default, unless the 25751231Ssheldonh # IPFIREWALL_DEFAULT_TO_ACCEPT option is set in your kernel 25851231Ssheldonh # config file. 25951231Ssheldonh ;; 26015027Sphk 26151231Ssheldonh[Ss][Ii][Mm][Pp][Ll][Ee]) 26251231Ssheldonh ############ 26351231Ssheldonh # This is a prototype setup for a simple firewall. Configure this 264121881Sru # machine as a DNS and NTP server, and point all the machines 26551231Ssheldonh # on the inside at this machine for those services. 266181762Sjhb # 267181762Sjhb # Configuration: 268200028Sume # firewall_simple_iif: Inside IPv4 network interface. 269200028Sume # firewall_simple_inet: Inside IPv4 network address. 270200028Sume # firewall_simple_oif: Outside IPv4 network interface. 271200028Sume # firewall_simple_onet: Outside IPv4 network address. 272200028Sume # firewall_simple_iif_ipv6: Inside IPv6 network interface. 273200028Sume # firewall_simple_inet_ipv6: Inside IPv6 network prefix. 274200028Sume # firewall_simple_oif_ipv6: Outside IPv6 network interface. 275200028Sume # firewall_simple_onet_ipv6: Outside IPv6 network prefix. 27651231Ssheldonh ############ 277284691Sjulian BAD_ADDR_TBL=13 27815027Sphk 279181761Sjhb # set these to your outside interface network 280181762Sjhb oif="$firewall_simple_oif" 281181762Sjhb onet="$firewall_simple_onet" 282200028Sume oif6="${firewall_simple_oif_ipv6:-$firewall_simple_oif}" 283200028Sume onet6="$firewall_simple_onet_ipv6" 28417594Sjkh 285181761Sjhb # set these to your inside interface network 286181762Sjhb iif="$firewall_simple_iif" 287181762Sjhb inet="$firewall_simple_inet" 288200028Sume iif6="${firewall_simple_iif_ipv6:-$firewall_simple_iif}" 289200028Sume inet6="$firewall_simple_inet_ipv6" 29015027Sphk 29151231Ssheldonh # Stop spoofing 292181761Sjhb ${fwcmd} add deny all from ${inet} to any in via ${oif} 293181761Sjhb ${fwcmd} add deny all from ${onet} to any in via ${iif} 294200028Sume if [ -n "$inet6" ]; then 295200028Sume ${fwcmd} add deny all from ${inet6} to any in via ${oif6} 296200028Sume if [ -n "$onet6" ]; then 297200028Sume ${fwcmd} add deny all from ${onet6} to any in \ 298200028Sume via ${iif6} 299200028Sume fi 300200028Sume fi 30115027Sphk 302284920Sjulian # Define stuff we should never send out or receive in. 30351231Ssheldonh # Stop RFC1918 nets on the outside interface 304284691Sjulian ${fwcmd} table ${BAD_ADDR_TBL} flush 305284691Sjulian ${fwcmd} table ${BAD_ADDR_TBL} add 10.0.0.0/8 306284691Sjulian ${fwcmd} table ${BAD_ADDR_TBL} add 172.16.0.0/12 307284691Sjulian ${fwcmd} table ${BAD_ADDR_TBL} add 192.168.0.0/16 30815027Sphk 309284920Sjulian # And stop draft-manning-dsua-03.txt (1 May 2000) nets (includes RESERVED-1, 31064028Sobrien # DHCP auto-configuration, NET-TEST, MULTICAST (class D), and class E) 31164028Sobrien # on the outside interface 312284691Sjulian ${fwcmd} table ${BAD_ADDR_TBL} add 0.0.0.0/8 313284691Sjulian ${fwcmd} table ${BAD_ADDR_TBL} add 169.254.0.0/16 314284691Sjulian ${fwcmd} table ${BAD_ADDR_TBL} add 192.0.2.0/24 315284691Sjulian ${fwcmd} table ${BAD_ADDR_TBL} add 224.0.0.0/4 316284691Sjulian ${fwcmd} table ${BAD_ADDR_TBL} add 240.0.0.0/4 31756736Srgrimes 318284691Sjulian ${fwcmd} add deny all from any to "table($BAD_ADDR_TBL)" via ${oif} 319284691Sjulian 32064244Sru # Network Address Translation. This rule is placed here deliberately 32164244Sru # so that it does not interfere with the surrounding address-checking 32264244Sru # rules. If for example one of your internal LAN machines had its IP 32364244Sru # address set to 192.0.2.1 then an incoming packet for it after being 32464244Sru # translated by natd(8) would match the `deny' rule above. Similarly 32564244Sru # an outgoing packet originated from it before being translated would 32664244Sru # match the `deny' rule below. 32764244Sru case ${natd_enable} in 32864244Sru [Yy][Ee][Ss]) 32964244Sru if [ -n "${natd_interface}" ]; then 330200028Sume ${fwcmd} add divert natd ip4 from any to any via ${natd_interface} 33164244Sru fi 33264244Sru ;; 33364244Sru esac 33464244Sru 335284691Sjulian ${fwcmd} add deny all from "table($BAD_ADDR_TBL)" to any via ${oif} 336200028Sume if [ -n "$inet6" ]; then 337200028Sume # Stop unique local unicast address on the outside interface 338200028Sume ${fwcmd} add deny all from fc00::/7 to any via ${oif6} 339200028Sume ${fwcmd} add deny all from any to fc00::/7 via ${oif6} 340200028Sume 341200028Sume # Stop site-local on the outside interface 342200028Sume ${fwcmd} add deny all from fec0::/10 to any via ${oif6} 343200028Sume ${fwcmd} add deny all from any to fec0::/10 via ${oif6} 344200028Sume 345200028Sume # Disallow "internal" addresses to appear on the wire. 346200028Sume ${fwcmd} add deny all from ::ffff:0.0.0.0/96 to any \ 347200028Sume via ${oif6} 348200028Sume ${fwcmd} add deny all from any to ::ffff:0.0.0.0/96 \ 349200028Sume via ${oif6} 350200028Sume 351200028Sume # Disallow packets to malicious IPv4 compatible prefix. 352200028Sume ${fwcmd} add deny all from ::224.0.0.0/100 to any via ${oif6} 353200028Sume ${fwcmd} add deny all from any to ::224.0.0.0/100 via ${oif6} 354200028Sume ${fwcmd} add deny all from ::127.0.0.0/104 to any via ${oif6} 355200028Sume ${fwcmd} add deny all from any to ::127.0.0.0/104 via ${oif6} 356200028Sume ${fwcmd} add deny all from ::0.0.0.0/104 to any via ${oif6} 357200028Sume ${fwcmd} add deny all from any to ::0.0.0.0/104 via ${oif6} 358200028Sume ${fwcmd} add deny all from ::255.0.0.0/104 to any via ${oif6} 359200028Sume ${fwcmd} add deny all from any to ::255.0.0.0/104 via ${oif6} 360200028Sume 361200028Sume ${fwcmd} add deny all from ::0.0.0.0/96 to any via ${oif6} 362200028Sume ${fwcmd} add deny all from any to ::0.0.0.0/96 via ${oif6} 363200028Sume 364200028Sume # Disallow packets to malicious 6to4 prefix. 365200028Sume ${fwcmd} add deny all from 2002:e000::/20 to any via ${oif6} 366200028Sume ${fwcmd} add deny all from any to 2002:e000::/20 via ${oif6} 367200028Sume ${fwcmd} add deny all from 2002:7f00::/24 to any via ${oif6} 368200028Sume ${fwcmd} add deny all from any to 2002:7f00::/24 via ${oif6} 369200028Sume ${fwcmd} add deny all from 2002:0000::/24 to any via ${oif6} 370200028Sume ${fwcmd} add deny all from any to 2002:0000::/24 via ${oif6} 371200028Sume ${fwcmd} add deny all from 2002:ff00::/24 to any via ${oif6} 372200028Sume ${fwcmd} add deny all from any to 2002:ff00::/24 via ${oif6} 373200028Sume 374200028Sume ${fwcmd} add deny all from 2002:0a00::/24 to any via ${oif6} 375200028Sume ${fwcmd} add deny all from any to 2002:0a00::/24 via ${oif6} 376200028Sume ${fwcmd} add deny all from 2002:ac10::/28 to any via ${oif6} 377200028Sume ${fwcmd} add deny all from any to 2002:ac10::/28 via ${oif6} 378200028Sume ${fwcmd} add deny all from 2002:c0a8::/32 to any via ${oif6} 379200028Sume ${fwcmd} add deny all from any to 2002:c0a8::/32 via ${oif6} 380200028Sume 381200028Sume ${fwcmd} add deny all from ff05::/16 to any via ${oif6} 382200028Sume ${fwcmd} add deny all from any to ff05::/16 via ${oif6} 383200028Sume fi 384200028Sume 38551231Ssheldonh # Allow TCP through if setup succeeded 38651231Ssheldonh ${fwcmd} add pass tcp from any to any established 38715027Sphk 38852873Sru # Allow IP fragments to pass through 38952873Sru ${fwcmd} add pass all from any to any frag 39052873Sru 39151231Ssheldonh # Allow setup of incoming email 392181760Sjhb ${fwcmd} add pass tcp from any to me 25 setup 39315027Sphk 39451231Ssheldonh # Allow access to our DNS 395181760Sjhb ${fwcmd} add pass tcp from any to me 53 setup 396181760Sjhb ${fwcmd} add pass udp from any to me 53 397181760Sjhb ${fwcmd} add pass udp from me 53 to any 39815027Sphk 39951231Ssheldonh # Allow access to our WWW 400181760Sjhb ${fwcmd} add pass tcp from any to me 80 setup 40115027Sphk 40251231Ssheldonh # Reject&Log all setup of incoming connections from the outside 403200028Sume ${fwcmd} add deny log ip4 from any to any in via ${oif} setup proto tcp 404200028Sume if [ -n "$inet6" ]; then 405200028Sume ${fwcmd} add deny log ip6 from any to any in via ${oif6} \ 406200028Sume setup proto tcp 407200028Sume fi 40815027Sphk 40951231Ssheldonh # Allow setup of any other TCP connection 41051231Ssheldonh ${fwcmd} add pass tcp from any to any setup 41115027Sphk 41251231Ssheldonh # Allow DNS queries out in the world 413181760Sjhb ${fwcmd} add pass udp from me to any 53 keep-state 41415027Sphk 41551231Ssheldonh # Allow NTP queries out in the world 416181760Sjhb ${fwcmd} add pass udp from me to any 123 keep-state 41715027Sphk 41851231Ssheldonh # Everything else is denied by default, unless the 41951231Ssheldonh # IPFIREWALL_DEFAULT_TO_ACCEPT option is set in your kernel 42051231Ssheldonh # config file. 42151231Ssheldonh ;; 42215027Sphk 423163749Sphk[Ww][Oo][Rr][Kk][Ss][Tt][Aa][Tt][Ii][Oo][Nn]) 424163749Sphk # Configuration: 425273201Shrs # firewall_myservices: List of ports/protocols on which this 426273201Shrs # host offers services. 427206399Sume # firewall_allowservices: List of IPv4 and/or IPv6 addresses 428206479Sume # that have access to 429163749Sphk # $firewall_myservices. 430206399Sume # firewall_trusted: List of IPv4 and/or IPv6 addresses 431206479Sume # that have full access to this host. 432206479Sume # Be very careful when setting this. 433206399Sume # This option can seriously degrade 434206399Sume # the level of protection provided by 435206399Sume # the firewall. 436163749Sphk # firewall_logdeny: Boolean (YES/NO) specifying if the 437163749Sphk # default denied packets should be 438163749Sphk # logged (in /var/log/security). 439163749Sphk # firewall_nologports: List of TCP/UDP ports for which 440229783Suqs # denied incoming packets are not 441163749Sphk # logged. 442200028Sume 443163749Sphk # Allow packets for which a state has been built. 444163749Sphk ${fwcmd} add check-state 445163749Sphk 446163749Sphk # For services permitted below. 447163749Sphk ${fwcmd} add pass tcp from me to any established 448163749Sphk 449163749Sphk # Allow any connection out, adding state for each. 450163749Sphk ${fwcmd} add pass tcp from me to any setup keep-state 451163749Sphk ${fwcmd} add pass udp from me to any keep-state 452163749Sphk ${fwcmd} add pass icmp from me to any keep-state 453200028Sume if [ $ipv6_available -eq 0 ]; then 454202460Sume ${fwcmd} add pass ipv6-icmp from me to any keep-state 455200028Sume fi 456163749Sphk 457163749Sphk # Allow DHCP. 458163749Sphk ${fwcmd} add pass udp from 0.0.0.0 68 to 255.255.255.255 67 out 459163749Sphk ${fwcmd} add pass udp from any 67 to me 68 in 460163749Sphk ${fwcmd} add pass udp from any 67 to 255.255.255.255 68 in 461200028Sume if [ $ipv6_available -eq 0 ]; then 462202460Sume ${fwcmd} add pass udp from fe80::/10 to me 546 in 463200028Sume fi 464208060Sdougb # Some servers will ping the IP while trying to decide if it's 465163749Sphk # still in use. 466163749Sphk ${fwcmd} add pass icmp from any to any icmptype 8 467200028Sume if [ $ipv6_available -eq 0 ]; then 468200028Sume ${fwcmd} add pass ipv6-icmp from any to any icmp6type 128,129 469200028Sume fi 470163749Sphk 471163749Sphk # Allow "mandatory" ICMP in. 472163749Sphk ${fwcmd} add pass icmp from any to any icmptype 3,4,11 473201752Sume if [ $ipv6_available -eq 0 ]; then 474201752Sume ${fwcmd} add pass ipv6-icmp from any to any icmp6type 3 475201752Sume fi 476201752Sume 477163749Sphk # Add permits for this workstations published services below 478163749Sphk # Only IPs and nets in firewall_allowservices is allowed in. 479208060Sdougb # If you really wish to let anyone use services on your 480163749Sphk # workstation, then set "firewall_allowservices='any'" in /etc/rc.conf 481163749Sphk # 482163749Sphk # Note: We don't use keep-state as that would allow DoS of 483208060Sdougb # our statetable. 484163749Sphk # You can add 'keep-state' to the lines for slightly 485163749Sphk # better performance if you fell that DoS of your 486163749Sphk # workstation won't be a problem. 487163749Sphk # 488163749Sphk for i in ${firewall_allowservices} ; do 489163749Sphk for j in ${firewall_myservices} ; do 490273201Shrs case $j in 491273201Shrs [0-9A-Za-z]*/[Pp][Rr][Oo][Tt][Oo]) 492273201Shrs ${fwcmd} add pass ${j%/[Pp][Rr][Oo][Tt][Oo]} from $i to me 493273201Shrs ;; 494273201Shrs [0-9A-Za-z]*/[Tt][Cc][Pp]) 495273201Shrs ${fwcmd} add pass tcp from $i to me ${j%/[Tt][Cc][Pp]} 496273201Shrs ;; 497273201Shrs [0-9A-Za-z]*/[Uu][Dd][Pp]) 498273201Shrs ${fwcmd} add pass udp from $i to me ${j%/[Uu][Dd][Pp]} 499273201Shrs ;; 500273201Shrs *[0-9A-Za-z]) 501273301Shrs echo "Consider using ${j}/tcp in firewall_myservices." \ 502273301Shrs > /dev/stderr 503273201Shrs ${fwcmd} add pass tcp from $i to me $j 504273201Shrs ;; 505273201Shrs *) 506273201Shrs echo "Invalid port in firewall_myservices: $j" > /dev/stderr 507273201Shrs ;; 508273201Shrs esac 509163749Sphk done 510163749Sphk done 511163749Sphk 512163749Sphk # Allow all connections from trusted IPs. 513163749Sphk # Playing with the content of firewall_trusted could seriously 514163749Sphk # degrade the level of protection provided by the firewall. 515163749Sphk for i in ${firewall_trusted} ; do 516163749Sphk ${fwcmd} add pass ip from $i to me 517163749Sphk done 518200028Sume 519163749Sphk ${fwcmd} add 65000 count ip from any to any 520163749Sphk 521163749Sphk # Drop packets to ports where we don't want logging 522163749Sphk for i in ${firewall_nologports} ; do 523163749Sphk ${fwcmd} add deny { tcp or udp } from any to any $i in 524163749Sphk done 525163749Sphk 526229783Suqs # Broadcasts and multicasts 527163749Sphk ${fwcmd} add deny ip from any to 255.255.255.255 528163749Sphk ${fwcmd} add deny ip from any to 224.0.0.0/24 in # XXX 529163749Sphk 530163749Sphk # Noise from routers 531163749Sphk ${fwcmd} add deny udp from any to any 520 in 532163749Sphk 533163749Sphk # Noise from webbrowsing. 534229783Suqs # The stateful filter is a bit aggressive, and will cause some 535163749Sphk # connection teardowns to be logged. 536163749Sphk ${fwcmd} add deny tcp from any 80,443 to any 1024-65535 in 537163749Sphk 538163749Sphk # Deny and (if wanted) log the rest unconditionally. 539163749Sphk log="" 540163749Sphk if [ ${firewall_logdeny:-x} = "YES" -o ${firewall_logdeny:-x} = "yes" ] ; then 541163749Sphk log="log logamount 500" # The default of 100 is too low. 542163749Sphk sysctl net.inet.ip.fw.verbose=1 >/dev/null 543163749Sphk fi 544163749Sphk ${fwcmd} add deny $log ip from any to any 545163749Sphk ;; 546163749Sphk 54791019Scjc[Cc][Ll][Oo][Ss][Ee][Dd]) 548163749Sphk ${fwcmd} add 65000 deny ip from any to any 54991019Scjc ;; 55051231Ssheldonh[Uu][Nn][Kk][Nn][Oo][Ww][Nn]) 55151231Ssheldonh ;; 55251231Ssheldonh*) 55359669Sbsd if [ -r "${firewall_type}" ]; then 55457014Spaul ${fwcmd} ${firewall_flags} ${firewall_type} 55551231Ssheldonh fi 55651231Ssheldonh ;; 55751231Ssheldonhesac 558