############ # Setup system for IPv6 firewall service. # $FreeBSD$ # 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="3ffe:505:2:1::" prefixlen="64" ip="3ffe:505:2:1::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="3ffe:505:2:1::" oprefixlen="64" oip="3ffe:505:2:1::1" # set these to your inside interface network and prefixlen and ip iif="ed1" inet="3ffe:505:2:2::" iprefixlen="64" iip="3ffe:505:2:2::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