rc.firewall revision 201930
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: head/etc/rc.firewall 201930 2010-01-09 19:16:27Z ume $ 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 49163749Sphk# workstation - will try to protect just this machine using statefull 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 8191019Scjcsetup_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 94200028Sumesetup_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 108200028Sume # Allow ICMPv6 destination unreach 109200028Sume ${fwcmd} add pass ipv6-icmp from any to any icmp6types 1 110200028Sume 111200028Sume # Allow NS/NA/toobig (don't filter it out) 112200028Sume ${fwcmd} add pass ipv6-icmp from any to any icmp6types 2,135,136 113200028Sume} 114200028Sume 11551231Ssheldonhif [ -n "${1}" ]; then 11651231Ssheldonh firewall_type="${1}" 11729300Sdannyfi 11829300Sdanny 119200028Sume. /etc/rc.subr 120200028Sume. /etc/network.subr 121200028Sumeafexists inet6 122200028Sumeipv6_available=$? 123200028Sume 12415027Sphk############ 12529300Sdanny# Set quiet mode if requested 12651231Ssheldonh# 12751231Ssheldonhcase ${firewall_quiet} in 12851231Ssheldonh[Yy][Ee][Ss]) 12929300Sdanny fwcmd="/sbin/ipfw -q" 13051231Ssheldonh ;; 13151231Ssheldonh*) 13229300Sdanny fwcmd="/sbin/ipfw" 13351231Ssheldonh ;; 13451231Ssheldonhesac 13529300Sdanny 13629300Sdanny############ 13716578Salex# Flush out the list before we begin. 13851231Ssheldonh# 13950357Ssheldonh${fwcmd} -f flush 14016578Salex 141163749Sphksetup_loopback 142200028Sumesetup_ipv6_mandatory 143163749Sphk 14416578Salex############ 14564244Sru# Network Address Translation. All packets are passed to natd(8) 14664244Sru# before they encounter your remaining rules. The firewall rules 14764244Sru# will then be run again on each packet after translation by natd 14864244Sru# starting at the rule number following the divert rule. 14951231Ssheldonh# 15064244Sru# For ``simple'' firewall type the divert rule should be put to a 15164244Sru# different place to not interfere with address-checking rules. 15273842Sobrien# 15364244Srucase ${firewall_type} in 15465257Sru[Oo][Pp][Ee][Nn]|[Cc][Ll][Ii][Ee][Nn][Tt]) 15564244Sru case ${natd_enable} in 15664244Sru [Yy][Ee][Ss]) 15764244Sru if [ -n "${natd_interface}" ]; then 158152562Sume ${fwcmd} add 50 divert natd ip4 from any to any via ${natd_interface} 15964244Sru fi 16064244Sru ;; 16164244Sru esac 162165648Spiso case ${firewall_nat_enable} in 163165648Spiso [Yy][Ee][Ss]) 164165648Spiso if [ -n "${firewall_nat_interface}" ]; then 165175522Srafan if echo "${firewall_nat_interface}" | \ 166175522Srafan grep -q -E '^[0-9]+(\.[0-9]+){0,3}$'; then 167175522Srafan firewall_nat_flags="ip ${firewall_nat_interface} ${firewall_nat_flags}" 168175522Srafan else 169175522Srafan firewall_nat_flags="if ${firewall_nat_interface} ${firewall_nat_flags}" 170175522Srafan fi 171175522Srafan ${fwcmd} nat 123 config log ${firewall_nat_flags} 172165648Spiso ${fwcmd} add 50 nat 123 ip4 from any to any via ${firewall_nat_interface} 173165648Spiso fi 174165648Spiso ;; 175165648Spiso esac 17651231Ssheldonhesac 17735267Sbrian 17835267Sbrian############ 17915027Sphk# If you just configured ipfw in the kernel as a tool to solve network 18015027Sphk# problems or you just want to disallow some particular kinds of traffic 18151805Smpp# then you will want to change the default policy to open. You can also 18217594Sjkh# do this as your only action by setting the firewall_type to ``open''. 18351231Ssheldonh# 18450357Ssheldonh# ${fwcmd} add 65000 pass all from any to any 18515027Sphk 18615027Sphk 18717594Sjkh# Prototype setups. 18851231Ssheldonh# 18951231Ssheldonhcase ${firewall_type} in 19051231Ssheldonh[Oo][Pp][Ee][Nn]) 19150357Ssheldonh ${fwcmd} add 65000 pass all from any to any 19251231Ssheldonh ;; 19354108Sobrien 19451231Ssheldonh[Cc][Ll][Ii][Ee][Nn][Tt]) 19551231Ssheldonh ############ 19651231Ssheldonh # This is a prototype setup that will protect your system somewhat 19751231Ssheldonh # against people from outside your own network. 198181762Sjhb # 199181762Sjhb # Configuration: 200200028Sume # firewall_client_net: Network address of local IPv4 network. 201200028Sume # firewall_client_net_ipv6: Network address of local IPv6 network. 20251231Ssheldonh ############ 20329300Sdanny 204181762Sjhb # set this to your local network 205181762Sjhb net="$firewall_client_net" 206200028Sume net6="$firewall_client_net_ipv6" 20717594Sjkh 208179598Skeramida # Allow limited broadcast traffic from my own net. 209181761Sjhb ${fwcmd} add pass all from ${net} to 255.255.255.255 210179598Skeramida 21151231Ssheldonh # Allow any traffic to or from my own net. 212181761Sjhb ${fwcmd} add pass all from me to ${net} 213181761Sjhb ${fwcmd} add pass all from ${net} to me 214200028Sume if [ -n "$net6" ]; then 215200028Sume ${fwcmd} add pass all from me6 to ${net6} 216200028Sume ${fwcmd} add pass all from ${net6} to me6 217200028Sume fi 21815027Sphk 219200028Sume if [ -n "$net6" ]; then 220200028Sume # Allow any link-local multicast traffic 221200028Sume ${fwcmd} add pass all from fe80::/10 to ff02::/16 222200028Sume ${fwcmd} add pass all from ${net6} to ff02::/16 223201930Sume # Allow DHCPv6 224201930Sume ${fwcmd} add pass udp from fe80::/10 to me6 546 225200028Sume fi 226200028Sume 22751231Ssheldonh # Allow TCP through if setup succeeded 22851231Ssheldonh ${fwcmd} add pass tcp from any to any established 22915027Sphk 23052873Sru # Allow IP fragments to pass through 23152873Sru ${fwcmd} add pass all from any to any frag 23252873Sru 23351231Ssheldonh # Allow setup of incoming email 234163749Sphk ${fwcmd} add pass tcp from any to me 25 setup 235201193Sume if [ -n "$net6" ]; then 236201193Sume ${fwcmd} add pass tcp from any to me6 25 setup 237201193Sume fi 23815027Sphk 23951231Ssheldonh # Allow setup of outgoing TCP connections only 240163749Sphk ${fwcmd} add pass tcp from me to any setup 241201193Sume if [ -n "$net6" ]; then 242201193Sume ${fwcmd} add pass tcp from me6 to any setup 243201193Sume fi 24415027Sphk 24551231Ssheldonh # Disallow setup of all other TCP connections 24651231Ssheldonh ${fwcmd} add deny tcp from any to any setup 24715027Sphk 24851231Ssheldonh # Allow DNS queries out in the world 249163749Sphk ${fwcmd} add pass udp from me to any 53 keep-state 250201193Sume if [ -n "$net6" ]; then 251201193Sume ${fwcmd} add pass udp from me6 to any 53 keep-state 252201193Sume fi 25315027Sphk 25451231Ssheldonh # Allow NTP queries out in the world 255163749Sphk ${fwcmd} add pass udp from me to any 123 keep-state 256201193Sume if [ -n "$net6" ]; then 257201193Sume ${fwcmd} add pass udp from me6 to any 123 keep-state 258201193Sume fi 25915027Sphk 26051231Ssheldonh # Everything else is denied by default, unless the 26151231Ssheldonh # IPFIREWALL_DEFAULT_TO_ACCEPT option is set in your kernel 26251231Ssheldonh # config file. 26351231Ssheldonh ;; 26415027Sphk 26551231Ssheldonh[Ss][Ii][Mm][Pp][Ll][Ee]) 26651231Ssheldonh ############ 26751231Ssheldonh # This is a prototype setup for a simple firewall. Configure this 268121881Sru # machine as a DNS and NTP server, and point all the machines 26951231Ssheldonh # on the inside at this machine for those services. 270181762Sjhb # 271181762Sjhb # Configuration: 272200028Sume # firewall_simple_iif: Inside IPv4 network interface. 273200028Sume # firewall_simple_inet: Inside IPv4 network address. 274200028Sume # firewall_simple_oif: Outside IPv4 network interface. 275200028Sume # firewall_simple_onet: Outside IPv4 network address. 276200028Sume # firewall_simple_iif_ipv6: Inside IPv6 network interface. 277200028Sume # firewall_simple_inet_ipv6: Inside IPv6 network prefix. 278200028Sume # firewall_simple_oif_ipv6: Outside IPv6 network interface. 279200028Sume # firewall_simple_onet_ipv6: Outside IPv6 network prefix. 28051231Ssheldonh ############ 28115027Sphk 282181761Sjhb # set these to your outside interface network 283181762Sjhb oif="$firewall_simple_oif" 284181762Sjhb onet="$firewall_simple_onet" 285200028Sume oif6="${firewall_simple_oif_ipv6:-$firewall_simple_oif}" 286200028Sume onet6="$firewall_simple_onet_ipv6" 28717594Sjkh 288181761Sjhb # set these to your inside interface network 289181762Sjhb iif="$firewall_simple_iif" 290181762Sjhb inet="$firewall_simple_inet" 291200028Sume iif6="${firewall_simple_iif_ipv6:-$firewall_simple_iif}" 292200028Sume inet6="$firewall_simple_inet_ipv6" 29315027Sphk 29451231Ssheldonh # Stop spoofing 295181761Sjhb ${fwcmd} add deny all from ${inet} to any in via ${oif} 296181761Sjhb ${fwcmd} add deny all from ${onet} to any in via ${iif} 297200028Sume if [ -n "$inet6" ]; then 298200028Sume ${fwcmd} add deny all from ${inet6} to any in via ${oif6} 299200028Sume if [ -n "$onet6" ]; then 300200028Sume ${fwcmd} add deny all from ${onet6} to any in \ 301200028Sume via ${iif6} 302200028Sume fi 303200028Sume fi 30415027Sphk 30551231Ssheldonh # Stop RFC1918 nets on the outside interface 30656736Srgrimes ${fwcmd} add deny all from any to 10.0.0.0/8 via ${oif} 30756736Srgrimes ${fwcmd} add deny all from any to 172.16.0.0/12 via ${oif} 30856736Srgrimes ${fwcmd} add deny all from any to 192.168.0.0/16 via ${oif} 30915027Sphk 31064028Sobrien # Stop draft-manning-dsua-03.txt (1 May 2000) nets (includes RESERVED-1, 31164028Sobrien # DHCP auto-configuration, NET-TEST, MULTICAST (class D), and class E) 31264028Sobrien # on the outside interface 31356736Srgrimes ${fwcmd} add deny all from any to 0.0.0.0/8 via ${oif} 31456736Srgrimes ${fwcmd} add deny all from any to 169.254.0.0/16 via ${oif} 31556736Srgrimes ${fwcmd} add deny all from any to 192.0.2.0/24 via ${oif} 31656736Srgrimes ${fwcmd} add deny all from any to 224.0.0.0/4 via ${oif} 31756736Srgrimes ${fwcmd} add deny all from any to 240.0.0.0/4 via ${oif} 31856736Srgrimes 31964244Sru # Network Address Translation. This rule is placed here deliberately 32064244Sru # so that it does not interfere with the surrounding address-checking 32164244Sru # rules. If for example one of your internal LAN machines had its IP 32264244Sru # address set to 192.0.2.1 then an incoming packet for it after being 32364244Sru # translated by natd(8) would match the `deny' rule above. Similarly 32464244Sru # an outgoing packet originated from it before being translated would 32564244Sru # match the `deny' rule below. 32664244Sru case ${natd_enable} in 32764244Sru [Yy][Ee][Ss]) 32864244Sru if [ -n "${natd_interface}" ]; then 329200028Sume ${fwcmd} add divert natd ip4 from any to any via ${natd_interface} 33064244Sru fi 33164244Sru ;; 33264244Sru esac 33364244Sru 33464244Sru # Stop RFC1918 nets on the outside interface 33564244Sru ${fwcmd} add deny all from 10.0.0.0/8 to any via ${oif} 33664244Sru ${fwcmd} add deny all from 172.16.0.0/12 to any via ${oif} 33764244Sru ${fwcmd} add deny all from 192.168.0.0/16 to any via ${oif} 33864244Sru 33964244Sru # Stop draft-manning-dsua-03.txt (1 May 2000) nets (includes RESERVED-1, 34064244Sru # DHCP auto-configuration, NET-TEST, MULTICAST (class D), and class E) 34164244Sru # on the outside interface 34264244Sru ${fwcmd} add deny all from 0.0.0.0/8 to any via ${oif} 34364244Sru ${fwcmd} add deny all from 169.254.0.0/16 to any via ${oif} 34464244Sru ${fwcmd} add deny all from 192.0.2.0/24 to any via ${oif} 34564244Sru ${fwcmd} add deny all from 224.0.0.0/4 to any via ${oif} 34664244Sru ${fwcmd} add deny all from 240.0.0.0/4 to any via ${oif} 34764244Sru 348200028Sume if [ -n "$inet6" ]; then 349200028Sume # Stop unique local unicast address on the outside interface 350200028Sume ${fwcmd} add deny all from fc00::/7 to any via ${oif6} 351200028Sume ${fwcmd} add deny all from any to fc00::/7 via ${oif6} 352200028Sume 353200028Sume # Stop site-local on the outside interface 354200028Sume ${fwcmd} add deny all from fec0::/10 to any via ${oif6} 355200028Sume ${fwcmd} add deny all from any to fec0::/10 via ${oif6} 356200028Sume 357200028Sume # Disallow "internal" addresses to appear on the wire. 358200028Sume ${fwcmd} add deny all from ::ffff:0.0.0.0/96 to any \ 359200028Sume via ${oif6} 360200028Sume ${fwcmd} add deny all from any to ::ffff:0.0.0.0/96 \ 361200028Sume via ${oif6} 362200028Sume 363200028Sume # Disallow packets to malicious IPv4 compatible prefix. 364200028Sume ${fwcmd} add deny all from ::224.0.0.0/100 to any via ${oif6} 365200028Sume ${fwcmd} add deny all from any to ::224.0.0.0/100 via ${oif6} 366200028Sume ${fwcmd} add deny all from ::127.0.0.0/104 to any via ${oif6} 367200028Sume ${fwcmd} add deny all from any to ::127.0.0.0/104 via ${oif6} 368200028Sume ${fwcmd} add deny all from ::0.0.0.0/104 to any via ${oif6} 369200028Sume ${fwcmd} add deny all from any to ::0.0.0.0/104 via ${oif6} 370200028Sume ${fwcmd} add deny all from ::255.0.0.0/104 to any via ${oif6} 371200028Sume ${fwcmd} add deny all from any to ::255.0.0.0/104 via ${oif6} 372200028Sume 373200028Sume ${fwcmd} add deny all from ::0.0.0.0/96 to any via ${oif6} 374200028Sume ${fwcmd} add deny all from any to ::0.0.0.0/96 via ${oif6} 375200028Sume 376200028Sume # Disallow packets to malicious 6to4 prefix. 377200028Sume ${fwcmd} add deny all from 2002:e000::/20 to any via ${oif6} 378200028Sume ${fwcmd} add deny all from any to 2002:e000::/20 via ${oif6} 379200028Sume ${fwcmd} add deny all from 2002:7f00::/24 to any via ${oif6} 380200028Sume ${fwcmd} add deny all from any to 2002:7f00::/24 via ${oif6} 381200028Sume ${fwcmd} add deny all from 2002:0000::/24 to any via ${oif6} 382200028Sume ${fwcmd} add deny all from any to 2002:0000::/24 via ${oif6} 383200028Sume ${fwcmd} add deny all from 2002:ff00::/24 to any via ${oif6} 384200028Sume ${fwcmd} add deny all from any to 2002:ff00::/24 via ${oif6} 385200028Sume 386200028Sume ${fwcmd} add deny all from 2002:0a00::/24 to any via ${oif6} 387200028Sume ${fwcmd} add deny all from any to 2002:0a00::/24 via ${oif6} 388200028Sume ${fwcmd} add deny all from 2002:ac10::/28 to any via ${oif6} 389200028Sume ${fwcmd} add deny all from any to 2002:ac10::/28 via ${oif6} 390200028Sume ${fwcmd} add deny all from 2002:c0a8::/32 to any via ${oif6} 391200028Sume ${fwcmd} add deny all from any to 2002:c0a8::/32 via ${oif6} 392200028Sume 393200028Sume ${fwcmd} add deny all from ff05::/16 to any via ${oif6} 394200028Sume ${fwcmd} add deny all from any to ff05::/16 via ${oif6} 395200028Sume fi 396200028Sume 39751231Ssheldonh # Allow TCP through if setup succeeded 39851231Ssheldonh ${fwcmd} add pass tcp from any to any established 39915027Sphk 40052873Sru # Allow IP fragments to pass through 40152873Sru ${fwcmd} add pass all from any to any frag 40252873Sru 40351231Ssheldonh # Allow setup of incoming email 404181760Sjhb ${fwcmd} add pass tcp from any to me 25 setup 405201193Sume if [ -n "$inet6" ]; then 406201193Sume ${fwcmd} add pass tcp from any to me6 25 setup 407201193Sume fi 40815027Sphk 40951231Ssheldonh # Allow access to our DNS 410181760Sjhb ${fwcmd} add pass tcp from any to me 53 setup 411181760Sjhb ${fwcmd} add pass udp from any to me 53 412181760Sjhb ${fwcmd} add pass udp from me 53 to any 413201193Sume if [ -n "$inet6" ]; then 414201193Sume ${fwcmd} add pass tcp from any to me6 53 setup 415201193Sume ${fwcmd} add pass udp from any to me6 53 416201193Sume ${fwcmd} add pass udp from me6 53 to any 417201193Sume fi 41815027Sphk 41951231Ssheldonh # Allow access to our WWW 420181760Sjhb ${fwcmd} add pass tcp from any to me 80 setup 421201193Sume if [ -n "$inet6" ]; then 422201193Sume ${fwcmd} add pass tcp from any to me6 80 setup 423201193Sume fi 42415027Sphk 42551231Ssheldonh # Reject&Log all setup of incoming connections from the outside 426200028Sume ${fwcmd} add deny log ip4 from any to any in via ${oif} setup proto tcp 427200028Sume if [ -n "$inet6" ]; then 428200028Sume ${fwcmd} add deny log ip6 from any to any in via ${oif6} \ 429200028Sume setup proto tcp 430200028Sume fi 43115027Sphk 43251231Ssheldonh # Allow setup of any other TCP connection 43351231Ssheldonh ${fwcmd} add pass tcp from any to any setup 43415027Sphk 43551231Ssheldonh # Allow DNS queries out in the world 436181760Sjhb ${fwcmd} add pass udp from me to any 53 keep-state 437201193Sume if [ -n "$inet6" ]; then 438201193Sume ${fwcmd} add pass udp from me6 to any 53 keep-state 439201193Sume fi 44015027Sphk 44151231Ssheldonh # Allow NTP queries out in the world 442181760Sjhb ${fwcmd} add pass udp from me to any 123 keep-state 443201193Sume if [ -n "$inet6" ]; then 444201193Sume ${fwcmd} add pass udp from me6 to any 123 keep-state 445201193Sume fi 44615027Sphk 44751231Ssheldonh # Everything else is denied by default, unless the 44851231Ssheldonh # IPFIREWALL_DEFAULT_TO_ACCEPT option is set in your kernel 44951231Ssheldonh # config file. 45051231Ssheldonh ;; 45115027Sphk 452163749Sphk[Ww][Oo][Rr][Kk][Ss][Tt][Aa][Tt][Ii][Oo][Nn]) 453163749Sphk # Configuration: 454163749Sphk # firewall_myservices: List of TCP ports on which this host 455163749Sphk # offers services. 456163749Sphk # firewall_allowservices: List of IPs which has access to 457163749Sphk # $firewall_myservices. 458200028Sume # firewall_trusted: List of IPv4s which has full access 459163749Sphk # to this host. Be very carefull 460163749Sphk # when setting this. This option can 461163749Sphk # seriously degrade the level of 462163749Sphk # protection provided by the firewall. 463163749Sphk # firewall_logdeny: Boolean (YES/NO) specifying if the 464163749Sphk # default denied packets should be 465163749Sphk # logged (in /var/log/security). 466163749Sphk # firewall_nologports: List of TCP/UDP ports for which 467163749Sphk # denied incomming packets are not 468163749Sphk # logged. 469200028Sume # firewall_trusted_ipv6: List of IPv6s which has full access 470200028Sume # to this host. Be very carefull 471200028Sume # when setting this. This option can 472200028Sume # seriously degrade the level of 473200028Sume # protection provided by the firewall. 474200028Sume 475163749Sphk # Allow packets for which a state has been built. 476163749Sphk ${fwcmd} add check-state 477163749Sphk 478163749Sphk # For services permitted below. 479163749Sphk ${fwcmd} add pass tcp from me to any established 480200028Sume if [ $ipv6_available -eq 0 ]; then 481200028Sume ${fwcmd} add pass tcp from me6 to any established 482200028Sume fi 483163749Sphk 484163749Sphk # Allow any connection out, adding state for each. 485163749Sphk ${fwcmd} add pass tcp from me to any setup keep-state 486163749Sphk ${fwcmd} add pass udp from me to any keep-state 487163749Sphk ${fwcmd} add pass icmp from me to any keep-state 488200028Sume if [ $ipv6_available -eq 0 ]; then 489200028Sume ${fwcmd} add pass tcp from me6 to any setup keep-state 490200028Sume ${fwcmd} add pass udp from me6 to any keep-state 491200028Sume ${fwcmd} add pass ipv6-icmp from me6 to any keep-state 492200028Sume fi 493163749Sphk 494163749Sphk # Allow DHCP. 495163749Sphk ${fwcmd} add pass udp from 0.0.0.0 68 to 255.255.255.255 67 out 496163749Sphk ${fwcmd} add pass udp from any 67 to me 68 in 497163749Sphk ${fwcmd} add pass udp from any 67 to 255.255.255.255 68 in 498200028Sume if [ $ipv6_available -eq 0 ]; then 499200028Sume ${fwcmd} add pass udp from fe80::/10 to me6 546 in 500200028Sume fi 501163749Sphk # Some servers will ping the IP while trying to decide if it's 502163749Sphk # still in use. 503163749Sphk ${fwcmd} add pass icmp from any to any icmptype 8 504200028Sume if [ $ipv6_available -eq 0 ]; then 505200028Sume ${fwcmd} add pass ipv6-icmp from any to any icmp6type 128,129 506200028Sume fi 507163749Sphk 508163749Sphk # Allow "mandatory" ICMP in. 509163749Sphk ${fwcmd} add pass icmp from any to any icmptype 3,4,11 510201752Sume if [ $ipv6_available -eq 0 ]; then 511201752Sume ${fwcmd} add pass ipv6-icmp from any to any icmp6type 3 512201752Sume fi 513201752Sume 514163749Sphk # Add permits for this workstations published services below 515163749Sphk # Only IPs and nets in firewall_allowservices is allowed in. 516163749Sphk # If you really wish to let anyone use services on your 517163749Sphk # workstation, then set "firewall_allowservices='any'" in /etc/rc.conf 518163749Sphk # 519163749Sphk # Note: We don't use keep-state as that would allow DoS of 520163749Sphk # our statetable. 521163749Sphk # You can add 'keep-state' to the lines for slightly 522163749Sphk # better performance if you fell that DoS of your 523163749Sphk # workstation won't be a problem. 524163749Sphk # 525163749Sphk for i in ${firewall_allowservices} ; do 526163749Sphk for j in ${firewall_myservices} ; do 527163749Sphk ${fwcmd} add pass tcp from $i to me $j 528200028Sume if [ $ipv6_available -eq 0 ]; then 529200028Sume ${fwcmd} add pass tcp from $i to me6 $j 530200028Sume fi 531163749Sphk done 532163749Sphk done 533163749Sphk 534163749Sphk # Allow all connections from trusted IPs. 535163749Sphk # Playing with the content of firewall_trusted could seriously 536163749Sphk # degrade the level of protection provided by the firewall. 537163749Sphk for i in ${firewall_trusted} ; do 538163749Sphk ${fwcmd} add pass ip from $i to me 539163749Sphk done 540200028Sume for i in ${firewall_trusted_ipv6} ; do 541200028Sume ${fwcmd} add pass all from $i to me6 542200028Sume done 543200028Sume 544163749Sphk ${fwcmd} add 65000 count ip from any to any 545163749Sphk 546163749Sphk # Drop packets to ports where we don't want logging 547163749Sphk for i in ${firewall_nologports} ; do 548163749Sphk ${fwcmd} add deny { tcp or udp } from any to any $i in 549163749Sphk done 550163749Sphk 551163749Sphk # Broadcasts and muticasts 552163749Sphk ${fwcmd} add deny ip from any to 255.255.255.255 553163749Sphk ${fwcmd} add deny ip from any to 224.0.0.0/24 in # XXX 554163749Sphk 555163749Sphk # Noise from routers 556163749Sphk ${fwcmd} add deny udp from any to any 520 in 557163749Sphk 558163749Sphk # Noise from webbrowsing. 559163749Sphk # The statefull filter is a bit agressive, and will cause some 560163749Sphk # connection teardowns to be logged. 561163749Sphk ${fwcmd} add deny tcp from any 80,443 to any 1024-65535 in 562163749Sphk 563163749Sphk # Deny and (if wanted) log the rest unconditionally. 564163749Sphk log="" 565163749Sphk if [ ${firewall_logdeny:-x} = "YES" -o ${firewall_logdeny:-x} = "yes" ] ; then 566163749Sphk log="log logamount 500" # The default of 100 is too low. 567163749Sphk sysctl net.inet.ip.fw.verbose=1 >/dev/null 568163749Sphk fi 569163749Sphk ${fwcmd} add deny $log ip from any to any 570163749Sphk ;; 571163749Sphk 57291019Scjc[Cc][Ll][Oo][Ss][Ee][Dd]) 573163749Sphk ${fwcmd} add 65000 deny ip from any to any 57491019Scjc ;; 57551231Ssheldonh[Uu][Nn][Kk][Nn][Oo][Ww][Nn]) 57651231Ssheldonh ;; 57751231Ssheldonh*) 57859669Sbsd if [ -r "${firewall_type}" ]; then 57957014Spaul ${fwcmd} ${firewall_flags} ${firewall_type} 58051231Ssheldonh fi 58151231Ssheldonh ;; 58251231Ssheldonhesac 583