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# $FreeBSD$ 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 ${fwcmd} add pass ipv6-icmp from any to any icmp6types 2,135,136 113200028Sume} 114200028Sume 11551231Ssheldonhif [ -n "${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 215202460Sume ${fwcmd} add pass all from me to ${net6} 216202460Sume ${fwcmd} add pass all from ${net6} to me 217200028Sume fi 21815027Sphk 219200028Sume if [ -n "$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 224202460Sume ${fwcmd} add pass udp from fe80::/10 to me 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 23515027Sphk 23651231Ssheldonh # Allow setup of outgoing TCP connections only 237163749Sphk ${fwcmd} add pass tcp from me to any setup 23815027Sphk 23951231Ssheldonh # Disallow setup of all other TCP connections 24051231Ssheldonh ${fwcmd} add deny tcp from any to any setup 24115027Sphk 24251231Ssheldonh # Allow DNS queries out in the world 243163749Sphk ${fwcmd} add pass udp from me to any 53 keep-state 24415027Sphk 24551231Ssheldonh # Allow NTP queries out in the world 246163749Sphk ${fwcmd} add pass udp from me to any 123 keep-state 24715027Sphk 24851231Ssheldonh # Everything else is denied by default, unless the 24951231Ssheldonh # IPFIREWALL_DEFAULT_TO_ACCEPT option is set in your kernel 25051231Ssheldonh # config file. 25151231Ssheldonh ;; 25215027Sphk 25351231Ssheldonh[Ss][Ii][Mm][Pp][Ll][Ee]) 25451231Ssheldonh ############ 25551231Ssheldonh # This is a prototype setup for a simple firewall. Configure this 256121881Sru # machine as a DNS and NTP server, and point all the machines 25751231Ssheldonh # on the inside at this machine for those services. 258181762Sjhb # 259181762Sjhb # Configuration: 260200028Sume # firewall_simple_iif: Inside IPv4 network interface. 261200028Sume # firewall_simple_inet: Inside IPv4 network address. 262200028Sume # firewall_simple_oif: Outside IPv4 network interface. 263200028Sume # firewall_simple_onet: Outside IPv4 network address. 264200028Sume # firewall_simple_iif_ipv6: Inside IPv6 network interface. 265200028Sume # firewall_simple_inet_ipv6: Inside IPv6 network prefix. 266200028Sume # firewall_simple_oif_ipv6: Outside IPv6 network interface. 267200028Sume # firewall_simple_onet_ipv6: Outside IPv6 network prefix. 26851231Ssheldonh ############ 269287091Sjulian BAD_ADDR_TBL=13 27015027Sphk 271181761Sjhb # set these to your outside interface network 272181762Sjhb oif="$firewall_simple_oif" 273181762Sjhb onet="$firewall_simple_onet" 274200028Sume oif6="${firewall_simple_oif_ipv6:-$firewall_simple_oif}" 275200028Sume onet6="$firewall_simple_onet_ipv6" 27617594Sjkh 277181761Sjhb # set these to your inside interface network 278181762Sjhb iif="$firewall_simple_iif" 279181762Sjhb inet="$firewall_simple_inet" 280200028Sume iif6="${firewall_simple_iif_ipv6:-$firewall_simple_iif}" 281200028Sume inet6="$firewall_simple_inet_ipv6" 28215027Sphk 28351231Ssheldonh # Stop spoofing 284181761Sjhb ${fwcmd} add deny all from ${inet} to any in via ${oif} 285181761Sjhb ${fwcmd} add deny all from ${onet} to any in via ${iif} 286200028Sume if [ -n "$inet6" ]; then 287200028Sume ${fwcmd} add deny all from ${inet6} to any in via ${oif6} 288200028Sume if [ -n "$onet6" ]; then 289200028Sume ${fwcmd} add deny all from ${onet6} to any in \ 290200028Sume via ${iif6} 291200028Sume fi 292200028Sume fi 29315027Sphk 294287091Sjulian # Define stuff we should never send out or receive in. 29551231Ssheldonh # Stop RFC1918 nets on the outside interface 296287091Sjulian ${fwcmd} table ${BAD_ADDR_TBL} flush 297287091Sjulian ${fwcmd} table ${BAD_ADDR_TBL} add 10.0.0.0/8 298287091Sjulian ${fwcmd} table ${BAD_ADDR_TBL} add 172.16.0.0/12 299287091Sjulian ${fwcmd} table ${BAD_ADDR_TBL} add 192.168.0.0/16 30015027Sphk 301287091Sjulian # And stop draft-manning-dsua-03.txt (1 May 2000) nets (includes RESERVED-1, 30264028Sobrien # DHCP auto-configuration, NET-TEST, MULTICAST (class D), and class E) 30364028Sobrien # on the outside interface 304287091Sjulian ${fwcmd} table ${BAD_ADDR_TBL} add 0.0.0.0/8 305287091Sjulian ${fwcmd} table ${BAD_ADDR_TBL} add 169.254.0.0/16 306287091Sjulian ${fwcmd} table ${BAD_ADDR_TBL} add 192.0.2.0/24 307287091Sjulian ${fwcmd} table ${BAD_ADDR_TBL} add 224.0.0.0/4 308287091Sjulian ${fwcmd} table ${BAD_ADDR_TBL} add 240.0.0.0/4 30956736Srgrimes 310287091Sjulian ${fwcmd} add deny all from any to "table($BAD_ADDR_TBL)" via ${oif} 311287091Sjulian 31264244Sru # Network Address Translation. This rule is placed here deliberately 31364244Sru # so that it does not interfere with the surrounding address-checking 31464244Sru # rules. If for example one of your internal LAN machines had its IP 31564244Sru # address set to 192.0.2.1 then an incoming packet for it after being 31664244Sru # translated by natd(8) would match the `deny' rule above. Similarly 31764244Sru # an outgoing packet originated from it before being translated would 31864244Sru # match the `deny' rule below. 31964244Sru case ${natd_enable} in 32064244Sru [Yy][Ee][Ss]) 32164244Sru if [ -n "${natd_interface}" ]; then 322200028Sume ${fwcmd} add divert natd ip4 from any to any via ${natd_interface} 32364244Sru fi 32464244Sru ;; 32564244Sru esac 32664244Sru 327287091Sjulian ${fwcmd} add deny all from "table($BAD_ADDR_TBL)" to any via ${oif} 328200028Sume if [ -n "$inet6" ]; then 329200028Sume # Stop unique local unicast address on the outside interface 330200028Sume ${fwcmd} add deny all from fc00::/7 to any via ${oif6} 331200028Sume ${fwcmd} add deny all from any to fc00::/7 via ${oif6} 332200028Sume 333200028Sume # Stop site-local on the outside interface 334200028Sume ${fwcmd} add deny all from fec0::/10 to any via ${oif6} 335200028Sume ${fwcmd} add deny all from any to fec0::/10 via ${oif6} 336200028Sume 337200028Sume # Disallow "internal" addresses to appear on the wire. 338200028Sume ${fwcmd} add deny all from ::ffff:0.0.0.0/96 to any \ 339200028Sume via ${oif6} 340200028Sume ${fwcmd} add deny all from any to ::ffff:0.0.0.0/96 \ 341200028Sume via ${oif6} 342200028Sume 343200028Sume # Disallow packets to malicious IPv4 compatible prefix. 344200028Sume ${fwcmd} add deny all from ::224.0.0.0/100 to any via ${oif6} 345200028Sume ${fwcmd} add deny all from any to ::224.0.0.0/100 via ${oif6} 346200028Sume ${fwcmd} add deny all from ::127.0.0.0/104 to any via ${oif6} 347200028Sume ${fwcmd} add deny all from any to ::127.0.0.0/104 via ${oif6} 348200028Sume ${fwcmd} add deny all from ::0.0.0.0/104 to any via ${oif6} 349200028Sume ${fwcmd} add deny all from any to ::0.0.0.0/104 via ${oif6} 350200028Sume ${fwcmd} add deny all from ::255.0.0.0/104 to any via ${oif6} 351200028Sume ${fwcmd} add deny all from any to ::255.0.0.0/104 via ${oif6} 352200028Sume 353200028Sume ${fwcmd} add deny all from ::0.0.0.0/96 to any via ${oif6} 354200028Sume ${fwcmd} add deny all from any to ::0.0.0.0/96 via ${oif6} 355200028Sume 356200028Sume # Disallow packets to malicious 6to4 prefix. 357200028Sume ${fwcmd} add deny all from 2002:e000::/20 to any via ${oif6} 358200028Sume ${fwcmd} add deny all from any to 2002:e000::/20 via ${oif6} 359200028Sume ${fwcmd} add deny all from 2002:7f00::/24 to any via ${oif6} 360200028Sume ${fwcmd} add deny all from any to 2002:7f00::/24 via ${oif6} 361200028Sume ${fwcmd} add deny all from 2002:0000::/24 to any via ${oif6} 362200028Sume ${fwcmd} add deny all from any to 2002:0000::/24 via ${oif6} 363200028Sume ${fwcmd} add deny all from 2002:ff00::/24 to any via ${oif6} 364200028Sume ${fwcmd} add deny all from any to 2002:ff00::/24 via ${oif6} 365200028Sume 366200028Sume ${fwcmd} add deny all from 2002:0a00::/24 to any via ${oif6} 367200028Sume ${fwcmd} add deny all from any to 2002:0a00::/24 via ${oif6} 368200028Sume ${fwcmd} add deny all from 2002:ac10::/28 to any via ${oif6} 369200028Sume ${fwcmd} add deny all from any to 2002:ac10::/28 via ${oif6} 370200028Sume ${fwcmd} add deny all from 2002:c0a8::/32 to any via ${oif6} 371200028Sume ${fwcmd} add deny all from any to 2002:c0a8::/32 via ${oif6} 372200028Sume 373200028Sume ${fwcmd} add deny all from ff05::/16 to any via ${oif6} 374200028Sume ${fwcmd} add deny all from any to ff05::/16 via ${oif6} 375200028Sume fi 376200028Sume 37751231Ssheldonh # Allow TCP through if setup succeeded 37851231Ssheldonh ${fwcmd} add pass tcp from any to any established 37915027Sphk 38052873Sru # Allow IP fragments to pass through 38152873Sru ${fwcmd} add pass all from any to any frag 38252873Sru 38351231Ssheldonh # Allow setup of incoming email 384181760Sjhb ${fwcmd} add pass tcp from any to me 25 setup 38515027Sphk 38651231Ssheldonh # Allow access to our DNS 387181760Sjhb ${fwcmd} add pass tcp from any to me 53 setup 388181760Sjhb ${fwcmd} add pass udp from any to me 53 389181760Sjhb ${fwcmd} add pass udp from me 53 to any 39015027Sphk 39151231Ssheldonh # Allow access to our WWW 392181760Sjhb ${fwcmd} add pass tcp from any to me 80 setup 39315027Sphk 39451231Ssheldonh # Reject&Log all setup of incoming connections from the outside 395200028Sume ${fwcmd} add deny log ip4 from any to any in via ${oif} setup proto tcp 396200028Sume if [ -n "$inet6" ]; then 397200028Sume ${fwcmd} add deny log ip6 from any to any in via ${oif6} \ 398200028Sume setup proto tcp 399200028Sume fi 40015027Sphk 40151231Ssheldonh # Allow setup of any other TCP connection 40251231Ssheldonh ${fwcmd} add pass tcp from any to any setup 40315027Sphk 40451231Ssheldonh # Allow DNS queries out in the world 405181760Sjhb ${fwcmd} add pass udp from me to any 53 keep-state 40615027Sphk 40751231Ssheldonh # Allow NTP queries out in the world 408181760Sjhb ${fwcmd} add pass udp from me to any 123 keep-state 40915027Sphk 41051231Ssheldonh # Everything else is denied by default, unless the 41151231Ssheldonh # IPFIREWALL_DEFAULT_TO_ACCEPT option is set in your kernel 41251231Ssheldonh # config file. 41351231Ssheldonh ;; 41415027Sphk 415163749Sphk[Ww][Oo][Rr][Kk][Ss][Tt][Aa][Tt][Ii][Oo][Nn]) 416163749Sphk # Configuration: 417285821Shrs # firewall_myservices: List of ports/protocols on which this 418285821Shrs # host offers services. 419206399Sume # firewall_allowservices: List of IPv4 and/or IPv6 addresses 420206479Sume # that have access to 421163749Sphk # $firewall_myservices. 422206399Sume # firewall_trusted: List of IPv4 and/or IPv6 addresses 423206479Sume # that have full access to this host. 424206479Sume # Be very careful when setting this. 425206399Sume # This option can seriously degrade 426206399Sume # the level of protection provided by 427206399Sume # the firewall. 428163749Sphk # firewall_logdeny: Boolean (YES/NO) specifying if the 429163749Sphk # default denied packets should be 430163749Sphk # logged (in /var/log/security). 431163749Sphk # firewall_nologports: List of TCP/UDP ports for which 432229783Suqs # denied incoming packets are not 433163749Sphk # logged. 434200028Sume 435163749Sphk # Allow packets for which a state has been built. 436163749Sphk ${fwcmd} add check-state 437163749Sphk 438163749Sphk # For services permitted below. 439163749Sphk ${fwcmd} add pass tcp from me to any established 440163749Sphk 441163749Sphk # Allow any connection out, adding state for each. 442163749Sphk ${fwcmd} add pass tcp from me to any setup keep-state 443163749Sphk ${fwcmd} add pass udp from me to any keep-state 444163749Sphk ${fwcmd} add pass icmp from me to any keep-state 445200028Sume if [ $ipv6_available -eq 0 ]; then 446202460Sume ${fwcmd} add pass ipv6-icmp from me to any keep-state 447200028Sume fi 448163749Sphk 449163749Sphk # Allow DHCP. 450163749Sphk ${fwcmd} add pass udp from 0.0.0.0 68 to 255.255.255.255 67 out 451163749Sphk ${fwcmd} add pass udp from any 67 to me 68 in 452163749Sphk ${fwcmd} add pass udp from any 67 to 255.255.255.255 68 in 453200028Sume if [ $ipv6_available -eq 0 ]; then 454202460Sume ${fwcmd} add pass udp from fe80::/10 to me 546 in 455200028Sume fi 456208060Sdougb # Some servers will ping the IP while trying to decide if it's 457163749Sphk # still in use. 458163749Sphk ${fwcmd} add pass icmp from any to any icmptype 8 459200028Sume if [ $ipv6_available -eq 0 ]; then 460200028Sume ${fwcmd} add pass ipv6-icmp from any to any icmp6type 128,129 461200028Sume fi 462163749Sphk 463163749Sphk # Allow "mandatory" ICMP in. 464163749Sphk ${fwcmd} add pass icmp from any to any icmptype 3,4,11 465201752Sume if [ $ipv6_available -eq 0 ]; then 466201752Sume ${fwcmd} add pass ipv6-icmp from any to any icmp6type 3 467201752Sume fi 468201752Sume 469163749Sphk # Add permits for this workstations published services below 470163749Sphk # Only IPs and nets in firewall_allowservices is allowed in. 471208060Sdougb # If you really wish to let anyone use services on your 472163749Sphk # workstation, then set "firewall_allowservices='any'" in /etc/rc.conf 473163749Sphk # 474163749Sphk # Note: We don't use keep-state as that would allow DoS of 475208060Sdougb # our statetable. 476163749Sphk # You can add 'keep-state' to the lines for slightly 477163749Sphk # better performance if you fell that DoS of your 478163749Sphk # workstation won't be a problem. 479163749Sphk # 480163749Sphk for i in ${firewall_allowservices} ; do 481163749Sphk for j in ${firewall_myservices} ; do 482285821Shrs case $j in 483285821Shrs [0-9A-Za-z]*/[Pp][Rr][Oo][Tt][Oo]) 484285821Shrs ${fwcmd} add pass ${j%/[Pp][Rr][Oo][Tt][Oo]} from $i to me 485285821Shrs ;; 486285821Shrs [0-9A-Za-z]*/[Tt][Cc][Pp]) 487285821Shrs ${fwcmd} add pass tcp from $i to me ${j%/[Tt][Cc][Pp]} 488285821Shrs ;; 489285821Shrs [0-9A-Za-z]*/[Uu][Dd][Pp]) 490285821Shrs ${fwcmd} add pass udp from $i to me ${j%/[Uu][Dd][Pp]} 491285821Shrs ;; 492285821Shrs *[0-9A-Za-z]) 493285821Shrs echo "Consider using ${j}/tcp in firewall_myservices." \ 494285821Shrs > /dev/stderr 495285821Shrs ${fwcmd} add pass tcp from $i to me $j 496285821Shrs ;; 497285821Shrs *) 498285821Shrs echo "Invalid port in firewall_myservices: $j" > /dev/stderr 499285821Shrs ;; 500285821Shrs esac 501163749Sphk done 502163749Sphk done 503163749Sphk 504163749Sphk # Allow all connections from trusted IPs. 505163749Sphk # Playing with the content of firewall_trusted could seriously 506163749Sphk # degrade the level of protection provided by the firewall. 507163749Sphk for i in ${firewall_trusted} ; do 508163749Sphk ${fwcmd} add pass ip from $i to me 509163749Sphk done 510200028Sume 511163749Sphk ${fwcmd} add 65000 count ip from any to any 512163749Sphk 513163749Sphk # Drop packets to ports where we don't want logging 514163749Sphk for i in ${firewall_nologports} ; do 515163749Sphk ${fwcmd} add deny { tcp or udp } from any to any $i in 516163749Sphk done 517163749Sphk 518229783Suqs # Broadcasts and multicasts 519163749Sphk ${fwcmd} add deny ip from any to 255.255.255.255 520163749Sphk ${fwcmd} add deny ip from any to 224.0.0.0/24 in # XXX 521163749Sphk 522163749Sphk # Noise from routers 523163749Sphk ${fwcmd} add deny udp from any to any 520 in 524163749Sphk 525163749Sphk # Noise from webbrowsing. 526229783Suqs # The stateful filter is a bit aggressive, and will cause some 527163749Sphk # connection teardowns to be logged. 528163749Sphk ${fwcmd} add deny tcp from any 80,443 to any 1024-65535 in 529163749Sphk 530163749Sphk # Deny and (if wanted) log the rest unconditionally. 531163749Sphk log="" 532163749Sphk if [ ${firewall_logdeny:-x} = "YES" -o ${firewall_logdeny:-x} = "yes" ] ; then 533163749Sphk log="log logamount 500" # The default of 100 is too low. 534163749Sphk sysctl net.inet.ip.fw.verbose=1 >/dev/null 535163749Sphk fi 536163749Sphk ${fwcmd} add deny $log ip from any to any 537163749Sphk ;; 538163749Sphk 53991019Scjc[Cc][Ll][Oo][Ss][Ee][Dd]) 540163749Sphk ${fwcmd} add 65000 deny ip from any to any 54191019Scjc ;; 54251231Ssheldonh[Uu][Nn][Kk][Nn][Oo][Ww][Nn]) 54351231Ssheldonh ;; 54451231Ssheldonh*) 54559669Sbsd if [ -r "${firewall_type}" ]; then 54657014Spaul ${fwcmd} ${firewall_flags} ${firewall_type} 54751231Ssheldonh fi 54851231Ssheldonh ;; 54951231Ssheldonhesac 550