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#!/bin/sh
############
# Setup system for IPv6 firewall service.
# $FreeBSD: src/etc/rc.firewall6,v 1.1.2.11 2003/02/10 05:45:06 trhodes Exp $
# $DragonFly: src/etc/rc.firewall6,v 1.3 2008/08/10 21:29:16 hasso Exp $
# Suck in the configuration variables.
if [ -z "${source_rc_confs_defined}" ]; then
if [ -r /etc/defaults/rc.conf ]; then
. /etc/defaults/rc.conf
source_rc_confs
elif [ -r /etc/rc.conf ]; then
. /etc/rc.conf
fi
fi
############
# Define the firewall type in /etc/rc.conf. Valid values are:
# open - will allow anyone in
# client - will try to protect just this machine
# simple - will try to protect a whole network
# closed - totally disables IP services except via lo0 interface
# UNKNOWN - disables the loading of firewall rules.
# filename - will load the rules in the given filename (full path required)
#
# For ``client'' and ``simple'' the entries below should be customized
# appropriately.
############
#
# If you don't know enough about packet filtering, we suggest that you
# take time to read this book:
#
# Building Internet Firewalls, 2nd Edition
# Brent Chapman and Elizabeth Zwicky
#
# O'Reilly & Associates, Inc
# ISBN 1-56592-871-7
# http://www.ora.com/
# http://www.oreilly.com/catalog/fire2/
#
# For a more advanced treatment of Internet Security read:
#
# Firewalls & Internet Security
# Repelling the wily hacker
# William R. Cheswick, Steven M. Bellowin
#
# Addison-Wesley
# ISBN 0-201-63357-4
# http://www.awl.com/
# http://www.awlonline.com/product/0%2C2627%2C0201633574%2C00.html
#
setup_local () {
############
# Only in rare cases do you want to change these rules
#
${fw6cmd} add 100 pass all from any to any via lo0
#
# ND
#
# DAD
${fw6cmd} add pass ipv6-icmp from :: to ff02::/16
# RS, RA, NS, NA, redirect...
${fw6cmd} add pass ipv6-icmp from fe80::/10 to fe80::/10
${fw6cmd} add pass ipv6-icmp from fe80::/10 to ff02::/16
}
if [ -n "${1}" ]; then
ipv6_firewall_type="${1}"
fi
############
# Set quiet mode if requested
#
case ${ipv6_firewall_quiet} in
[Yy][Ee][Ss])
fw6cmd="/sbin/ip6fw -q"
;;
*)
fw6cmd="/sbin/ip6fw"
;;
esac
############
# Flush out the list before we begin.
#
${fw6cmd} -f flush
############
# If you just configured ipfw in the kernel as a tool to solve network
# problems or you just want to disallow some particular kinds of traffic
# then you will want to change the default policy to open. You can also
# do this as your only action by setting the ipv6_firewall_type to ``open''.
#
# ${fw6cmd} add 65000 pass all from any to any
# Prototype setups.
#
case ${ipv6_firewall_type} in
[Oo][Pp][Ee][Nn])
setup_local
${fw6cmd} add 65000 pass all from any to any
;;
[Cc][Ll][Ii][Ee][Nn][Tt])
############
# This is a prototype setup that will protect your system somewhat
# against people from outside your own network.
############
# set these to your network and prefixlen and ip
#
# This needs more work
#
net="2001:db8:2:1::"
prefixlen="64"
ip="2001:db8:2:1::1"
setup_local
# Allow any traffic to or from my own net.
${fw6cmd} add pass all from ${ip} to ${net}/${prefixlen}
${fw6cmd} add pass all from ${net}/${prefixlen} to ${ip}
# Allow any link-local multicast traffic
${fw6cmd} add pass all from fe80::/10 to ff02::/16
${fw6cmd} add pass all from ${net}/${prefixlen} to ff02::/16
# Allow TCP through if setup succeeded
${fw6cmd} add pass tcp from any to any established
# Allow IP fragments to pass through
${fw6cmd} add pass all from any to any frag
# Allow setup of incoming email
${fw6cmd} add pass tcp from any to ${ip} 25 setup
# Allow setup of outgoing TCP connections only
${fw6cmd} add pass tcp from ${ip} to any setup
# Disallow setup of all other TCP connections
${fw6cmd} add deny tcp from any to any setup
# Allow DNS queries out in the world
${fw6cmd} add pass udp from any 53 to ${ip}
${fw6cmd} add pass udp from ${ip} to any 53
# Allow NTP queries out in the world
${fw6cmd} add pass udp from any 123 to ${ip}
${fw6cmd} add pass udp from ${ip} to any 123
# Allow ICMPv6 destination unreach
${fw6cmd} add pass ipv6-icmp from any to any icmptypes 1
# Allow NS/NA/toobig (don't filter it out)
${fw6cmd} add pass ipv6-icmp from any to any icmptypes 2,135,136
# Everything else is denied by default, unless the
# IPV6FIREWALL_DEFAULT_TO_ACCEPT option is set in your kernel
# config file.
;;
[Ss][Ii][Mm][Pp][Ll][Ee])
############
# This is a prototype setup for a simple firewall. Configure this
# machine as a named server and ntp server, and point all the machines
# on the inside at this machine for those services.
############
# set these to your outside interface network and prefixlen and ip
oif="ed0"
onet="2001:db8:2:1::"
oprefixlen="64"
oip="2001:db8:2:1::1"
# set these to your inside interface network and prefixlen and ip
iif="ed1"
inet="2001:db8:2:2::"
iprefixlen="64"
iip="2001:db8:2:2::1"
setup_local
# Stop spoofing
${fw6cmd} add deny all from ${inet}/${iprefixlen} to any in via ${oif}
${fw6cmd} add deny all from ${onet}/${oprefixlen} to any in via ${iif}
# Stop site-local on the outside interface
${fw6cmd} add deny all from fec0::/10 to any via ${oif}
${fw6cmd} add deny all from any to fec0::/10 via ${oif}
# Disallow "internal" addresses to appear on the wire.
${fw6cmd} add deny all from ::ffff:0.0.0.0/96 to any via ${oif}
${fw6cmd} add deny all from any to ::ffff:0.0.0.0/96 via ${oif}
# Disallow packets to malicious IPv4 compatible prefix.
${fw6cmd} add deny all from ::224.0.0.0/100 to any via ${oif}
${fw6cmd} add deny all from any to ::224.0.0.0/100 via ${oif}
${fw6cmd} add deny all from ::127.0.0.0/104 to any via ${oif}
${fw6cmd} add deny all from any to ::127.0.0.0/104 via ${oif}
${fw6cmd} add deny all from ::0.0.0.0/104 to any via ${oif}
${fw6cmd} add deny all from any to ::0.0.0.0/104 via ${oif}
${fw6cmd} add deny all from ::255.0.0.0/104 to any via ${oif}
${fw6cmd} add deny all from any to ::255.0.0.0/104 via ${oif}
${fw6cmd} add deny all from ::0.0.0.0/96 to any via ${oif}
${fw6cmd} add deny all from any to ::0.0.0.0/96 via ${oif}
# Disallow packets to malicious 6to4 prefix.
${fw6cmd} add deny all from 2002:e000::/20 to any via ${oif}
${fw6cmd} add deny all from any to 2002:e000::/20 via ${oif}
${fw6cmd} add deny all from 2002:7f00::/24 to any via ${oif}
${fw6cmd} add deny all from any to 2002:7f00::/24 via ${oif}
${fw6cmd} add deny all from 2002:0000::/24 to any via ${oif}
${fw6cmd} add deny all from any to 2002:0000::/24 via ${oif}
${fw6cmd} add deny all from 2002:ff00::/24 to any via ${oif}
${fw6cmd} add deny all from any to 2002:ff00::/24 via ${oif}
${fw6cmd} add deny all from 2002:0a00::/24 to any via ${oif}
${fw6cmd} add deny all from any to 2002:0a00::/24 via ${oif}
${fw6cmd} add deny all from 2002:ac10::/28 to any via ${oif}
${fw6cmd} add deny all from any to 2002:ac10::/28 via ${oif}
${fw6cmd} add deny all from 2002:c0a8::/32 to any via ${oif}
${fw6cmd} add deny all from any to 2002:c0a8::/32 via ${oif}
${fw6cmd} add deny all from ff05::/16 to any via ${oif}
${fw6cmd} add deny all from any to ff05::/16 via ${oif}
# Allow TCP through if setup succeeded
${fw6cmd} add pass tcp from any to any established
# Allow IP fragments to pass through
${fw6cmd} add pass all from any to any frag
# Allow setup of incoming email
${fw6cmd} add pass tcp from any to ${oip} 25 setup
# Allow access to our DNS
${fw6cmd} add pass tcp from any to ${oip} 53 setup
${fw6cmd} add pass udp from any to ${oip} 53
${fw6cmd} add pass udp from ${oip} 53 to any
# Allow access to our WWW
${fw6cmd} add pass tcp from any to ${oip} 80 setup
# Reject&Log all setup of incoming connections from the outside
${fw6cmd} add deny log tcp from any to any in via ${oif} setup
# Allow setup of any other TCP connection
${fw6cmd} add pass tcp from any to any setup
# Allow DNS queries out in the world
${fw6cmd} add pass udp from any 53 to ${oip}
${fw6cmd} add pass udp from ${oip} to any 53
# Allow NTP queries out in the world
${fw6cmd} add pass udp from any 123 to ${oip}
${fw6cmd} add pass udp from ${oip} to any 123
# Allow RIPng
#${fw6cmd} add pass udp from fe80::/10 521 to ff02::9 521
#${fw6cmd} add pass udp from fe80::/10 521 to fe80::/10 521
# Allow ICMPv6 destination unreach
${fw6cmd} add pass ipv6-icmp from any to any icmptypes 1
# Allow NS/NA/toobig (don't filter it out)
${fw6cmd} add pass ipv6-icmp from any to any icmptypes 2,135,136
# Everything else is denied by default, unless the
# IPV6FIREWALL_DEFAULT_TO_ACCEPT option is set in your kernel
# config file.
;;
[Cc][Ll][Oo][Ss][Ee][Dd])
# Only enable the loopback interface
${fw6cmd} add 100 pass all from any to any via lo0
;;
[Uu][Nn][Kk][Nn][Oo][Ww][Nn])
;;
*)
if [ -r "${ipv6_firewall_type}" ]; then
${fw6cmd} ${ipv6_firewall_flags} ${ipv6_firewall_type}
fi
;;
esac
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