296 lines
9.2 KiB
Bash
296 lines
9.2 KiB
Bash
#!/bin/sh -
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############
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# Setup system for IPv6 firewall service.
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# $FreeBSD$
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# Suck in the configuration variables.
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if [ -z "${source_rc_confs_defined}" ]; then
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if [ -r /etc/defaults/rc.conf ]; then
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. /etc/defaults/rc.conf
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source_rc_confs
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elif [ -r /etc/rc.conf ]; then
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. /etc/rc.conf
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fi
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fi
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############
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# Define the firewall type in /etc/rc.conf. Valid values are:
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# open - will allow anyone in
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# client - will try to protect just this machine
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# simple - will try to protect a whole network
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# closed - totally disables IP services except via lo0 interface
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# UNKNOWN - disables the loading of firewall rules.
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# filename - will load the rules in the given filename (full path required)
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#
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# For ``client'' and ``simple'' the entries below should be customized
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# appropriately.
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############
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#
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# If you don't know enough about packet filtering, we suggest that you
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# take time to read this book:
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#
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# Building Internet Firewalls, 2nd Edition
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# Brent Chapman and Elizabeth Zwicky
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#
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# O'Reilly & Associates, Inc
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# ISBN 1-56592-871-7
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# http://www.ora.com/
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# http://www.oreilly.com/catalog/fire2/
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#
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# For a more advanced treatment of Internet Security read:
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#
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# Firewalls and Internet Security: Repelling the Wily Hacker, 2nd Edition
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# William R. Cheswick, Steven M. Bellowin, Aviel D. Rubin
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#
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# Addison-Wesley / Prentice Hall
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# ISBN 0-201-63466-X
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# http://www.pearsonhighered.com/
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# http://www.pearsonhighered.com/educator/academic/product/0,3110,020163466X,00.html
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#
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setup_local () {
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############
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# Only in rare cases do you want to change these rules
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#
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${fw6cmd} add 100 pass ip6 from any to any via lo0
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${fw6cmd} add 200 deny ip6 from any to ::1
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${fw6cmd} add 300 deny ip6 from ::1 to any
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#
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# ND
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#
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# DAD
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${fw6cmd} add pass ip6 from :: to ff02::/16 proto ipv6-icmp
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# RS, RA, NS, NA, redirect...
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${fw6cmd} add pass ip6 from fe80::/10 to fe80::/10 proto ipv6-icmp
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${fw6cmd} add pass ip6 from fe80::/10 to ff02::/16 proto ipv6-icmp
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}
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if [ -n "${1}" ]; then
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ipv6_firewall_type="${1}"
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fi
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############
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# Set quiet mode if requested
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#
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case ${ipv6_firewall_quiet} in
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[Yy][Ee][Ss])
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fw6cmd="/sbin/ipfw -q"
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;;
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*)
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fw6cmd="/sbin/ipfw"
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;;
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esac
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############
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# Flush out the list before we begin.
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#
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${fw6cmd} -f flush
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############
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# If you just configured ipfw in the kernel as a tool to solve network
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# problems or you just want to disallow some particular kinds of traffic
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# then you will want to change the default policy to open. You can also
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# do this as your only action by setting the ipv6_firewall_type to ``open''.
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#
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# ${fw6cmd} add 65000 pass all from any to any
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# Prototype setups.
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#
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case ${ipv6_firewall_type} in
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[Oo][Pp][Ee][Nn])
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setup_local
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${fw6cmd} add 65000 pass ip6 from any to any
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;;
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[Cc][Ll][Ii][Ee][Nn][Tt])
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############
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# This is a prototype setup that will protect your system somewhat
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# against people from outside your own network.
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############
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# set these to your network and prefixlen and ip
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#
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# This needs more work
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#
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net="2001:db8:2:1::"
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prefixlen="64"
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ip="2001:db8:2:1::1"
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setup_local
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# Allow any traffic to or from my own net.
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${fw6cmd} add pass ip6 from ${ip} to ${net}/${prefixlen}
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${fw6cmd} add pass ip6 from ${net}/${prefixlen} to ${ip}
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# Allow any link-local multicast traffic
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${fw6cmd} add pass ip6 from fe80::/10 to ff02::/16
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${fw6cmd} add pass ip6 from ${net}/${prefixlen} to ff02::/16
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# Allow TCP through if setup succeeded
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${fw6cmd} add pass ip6 from any to any established proto tcp
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# Allow IP fragments to pass through
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${fw6cmd} add pass ip6 from any to any frag
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# Allow setup of incoming email
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${fw6cmd} add pass ip6 from any to ${ip} 25 setup proto tcp
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# Allow setup of outgoing TCP connections only
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${fw6cmd} add pass ip6 from ${ip} to any setup proto tcp
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# Disallow setup of all other TCP connections
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${fw6cmd} add deny ip6 from any to any setup proto tcp
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# Allow DNS queries out in the world
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${fw6cmd} add pass ip6 from any 53 to ${ip} proto udp
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${fw6cmd} add pass ip6 from ${ip} to any 53 proto udp
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# Allow NTP queries out in the world
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${fw6cmd} add pass ip6 from any 123 to ${ip} proto udp
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${fw6cmd} add pass ip6 from ${ip} to any 123 proto udp
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# Allow ICMPv6 destination unreach
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${fw6cmd} add pass ip6 from any to any icmp6types 1 proto ipv6-icmp
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# Allow NS/NA/toobig (don't filter it out)
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${fw6cmd} add pass ip6 from any to any icmp6types 2,135,136 \
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proto ipv6-icmp
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# Everything else is denied by default, unless the
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# IPV6FIREWALL_DEFAULT_TO_ACCEPT option is set in your kernel
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# config file.
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;;
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[Ss][Ii][Mm][Pp][Ll][Ee])
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############
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# This is a prototype setup for a simple firewall. Configure this
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# machine as a DNS and NTP server, and point all the machines
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# on the inside at this machine for those services.
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############
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# set these to your outside interface network and prefixlen and ip
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oif="ed0"
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onet="2001:db8:2:1::"
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oprefixlen="64"
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oip="2001:db8:2:1::1"
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# set these to your inside interface network and prefixlen and ip
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iif="ed1"
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inet="2001:db8:2:2::"
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iprefixlen="64"
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iip="2001:db8:2:2::1"
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setup_local
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# Stop spoofing
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${fw6cmd} add deny ip6 from ${inet}/${iprefixlen} to any in via ${oif}
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${fw6cmd} add deny ip6 from ${onet}/${oprefixlen} to any in via ${iif}
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# Stop unique local unicast address on the outside interface
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${fw6cmd} add deny ip6 from fc00::/7 to any via ${oif}
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${fw6cmd} add deny ip6 from any to fc00::/7 via ${oif}
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# Stop site-local on the outside interface
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${fw6cmd} add deny ip6 from fec0::/10 to any via ${oif}
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${fw6cmd} add deny ip6 from any to fec0::/10 via ${oif}
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# Disallow "internal" addresses to appear on the wire.
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${fw6cmd} add deny ip6 from ::ffff:0.0.0.0/96 to any via ${oif}
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${fw6cmd} add deny ip6 from any to ::ffff:0.0.0.0/96 via ${oif}
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# Disallow packets to malicious IPv4 compatible prefix.
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${fw6cmd} add deny ip6 from ::224.0.0.0/100 to any via ${oif}
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${fw6cmd} add deny ip6 from any to ::224.0.0.0/100 via ${oif}
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${fw6cmd} add deny ip6 from ::127.0.0.0/104 to any via ${oif}
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${fw6cmd} add deny ip6 from any to ::127.0.0.0/104 via ${oif}
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${fw6cmd} add deny ip6 from ::0.0.0.0/104 to any via ${oif}
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${fw6cmd} add deny ip6 from any to ::0.0.0.0/104 via ${oif}
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${fw6cmd} add deny ip6 from ::255.0.0.0/104 to any via ${oif}
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${fw6cmd} add deny ip6 from any to ::255.0.0.0/104 via ${oif}
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${fw6cmd} add deny ip6 from ::0.0.0.0/96 to any via ${oif}
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${fw6cmd} add deny ip6 from any to ::0.0.0.0/96 via ${oif}
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# Disallow packets to malicious 6to4 prefix.
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${fw6cmd} add deny ip6 from 2002:e000::/20 to any via ${oif}
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${fw6cmd} add deny ip6 from any to 2002:e000::/20 via ${oif}
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${fw6cmd} add deny ip6 from 2002:7f00::/24 to any via ${oif}
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${fw6cmd} add deny ip6 from any to 2002:7f00::/24 via ${oif}
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${fw6cmd} add deny ip6 from 2002:0000::/24 to any via ${oif}
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${fw6cmd} add deny ip6 from any to 2002:0000::/24 via ${oif}
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${fw6cmd} add deny ip6 from 2002:ff00::/24 to any via ${oif}
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${fw6cmd} add deny ip6 from any to 2002:ff00::/24 via ${oif}
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${fw6cmd} add deny ip6 from 2002:0a00::/24 to any via ${oif}
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${fw6cmd} add deny ip6 from any to 2002:0a00::/24 via ${oif}
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${fw6cmd} add deny ip6 from 2002:ac10::/28 to any via ${oif}
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${fw6cmd} add deny ip6 from any to 2002:ac10::/28 via ${oif}
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${fw6cmd} add deny ip6 from 2002:c0a8::/32 to any via ${oif}
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${fw6cmd} add deny ip6 from any to 2002:c0a8::/32 via ${oif}
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${fw6cmd} add deny ip6 from ff05::/16 to any via ${oif}
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${fw6cmd} add deny ip6 from any to ff05::/16 via ${oif}
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# Allow TCP through if setup succeeded
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${fw6cmd} add pass tcp from any to any established
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# Allow IP fragments to pass through
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${fw6cmd} add pass ip6 from any to any frag
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# Allow setup of incoming email
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${fw6cmd} add pass ip6 from any to ${oip} 25 setup proto tcp
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# Allow access to our DNS
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${fw6cmd} add pass ip6 from any to ${oip} 53 setup proto tcp
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${fw6cmd} add pass ip6 from any to ${oip} 53 proto udp
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${fw6cmd} add pass ip6 from ${oip} 53 to any proto udp
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# Allow access to our WWW
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${fw6cmd} add pass ip6 from any to ${oip} 80 setup proto tcp
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# Reject&Log all setup of incoming connections from the outside
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${fw6cmd} add deny log ip6 from any to any in via ${oif} setup \
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proto tcp
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# Allow setup of any other TCP connection
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${fw6cmd} add pass ip6 from any to any setup proto tcp
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# Allow DNS queries out in the world
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${fw6cmd} add pass ip6 from any 53 to ${oip} proto udp
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${fw6cmd} add pass ip6 from ${oip} to any 53 proto udp
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# Allow NTP queries out in the world
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${fw6cmd} add pass ip6 from any 123 to ${oip} proto udp
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${fw6cmd} add pass ip6 from ${oip} to any 123 proto udp
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# Allow RIPng
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#${fw6cmd} add pass ip6 from fe80::/10 521 to ff02::9 521 proto udp
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#${fw6cmd} add pass ip6 from fe80::/10 521 to fe80::/10 521 proto udp
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# Allow ICMPv6 destination unreach
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${fw6cmd} add pass ip6 from any to any icmp6types 1 proto ipv6-icmp
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# Allow NS/NA/toobig (don't filter it out)
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${fw6cmd} add pass ip6 from any to any icmp6types 2,135,136 \
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proto ipv6-icmp
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# Everything else is denied by default, unless the
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# IPV6FIREWALL_DEFAULT_TO_ACCEPT option is set in your kernel
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# config file.
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;;
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[Cc][Ll][Oo][Ss][Ee][Dd])
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# Only enable the loopback interface
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${fw6cmd} add 100 pass ip6 from any to any via lo0
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;;
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[Uu][Nn][Kk][Nn][Oo][Ww][Nn])
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;;
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*)
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if [ -r "${ipv6_firewall_type}" ]; then
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${fw6cmd} ${ipv6_firewall_flags} ${ipv6_firewall_type}
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fi
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;;
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esac
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