550 lines
18 KiB
Bash
550 lines
18 KiB
Bash
#!/bin/sh -
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# Copyright (c) 1996 Poul-Henning Kamp
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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# SUCH DAMAGE.
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#
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# $FreeBSD$
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#
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#
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# Setup system for ipfw(4) firewall service.
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#
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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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# workstation - will try to protect just this machine using stateful
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# firewalling. See below for rc.conf variables used
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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_loopback() {
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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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${fwcmd} add 100 pass all from any to any via lo0
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${fwcmd} add 200 deny all from any to 127.0.0.0/8
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${fwcmd} add 300 deny ip from 127.0.0.0/8 to any
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if [ $ipv6_available -eq 0 ]; then
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${fwcmd} add 400 deny all from any to ::1
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${fwcmd} add 500 deny all from ::1 to any
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fi
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}
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setup_ipv6_mandatory() {
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[ $ipv6_available -eq 0 ] || return 0
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############
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# Only in rare cases do you want to change these rules
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#
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# ND
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#
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# DAD
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${fwcmd} add pass ipv6-icmp from :: to ff02::/16
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# RS, RA, NS, NA, redirect...
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${fwcmd} add pass ipv6-icmp from fe80::/10 to fe80::/10
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${fwcmd} add pass ipv6-icmp from fe80::/10 to ff02::/16
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# Allow ICMPv6 destination unreachable
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${fwcmd} add pass ipv6-icmp from any to any icmp6types 1
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# Allow NS/NA/toobig (don't filter it out)
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${fwcmd} add pass ipv6-icmp from any to any icmp6types 2,135,136
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}
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if [ -n "${1}" ]; then
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firewall_type="${1}"
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fi
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. /etc/rc.subr
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. /etc/network.subr
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afexists inet6
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ipv6_available=$?
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############
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# Set quiet mode if requested
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#
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case ${firewall_quiet} in
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[Yy][Ee][Ss])
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fwcmd="/sbin/ipfw -q"
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;;
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*)
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fwcmd="/sbin/ipfw"
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;;
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esac
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############
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# Flush out the list before we begin.
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#
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${fwcmd} -f flush
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setup_loopback
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setup_ipv6_mandatory
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############
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# Network Address Translation. All packets are passed to natd(8)
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# before they encounter your remaining rules. The firewall rules
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# will then be run again on each packet after translation by natd
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# starting at the rule number following the divert rule.
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#
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# For ``simple'' firewall type the divert rule should be put to a
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# different place to not interfere with address-checking rules.
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#
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case ${firewall_type} in
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[Oo][Pp][Ee][Nn]|[Cc][Ll][Ii][Ee][Nn][Tt])
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case ${natd_enable} in
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[Yy][Ee][Ss])
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if [ -n "${natd_interface}" ]; then
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${fwcmd} add 50 divert natd ip4 from any to any via ${natd_interface}
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fi
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;;
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esac
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case ${firewall_nat_enable} in
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[Yy][Ee][Ss])
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if [ -n "${firewall_nat_interface}" ]; then
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if echo "${firewall_nat_interface}" | \
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grep -q -E '^[0-9]+(\.[0-9]+){0,3}$'; then
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firewall_nat_flags="ip ${firewall_nat_interface} ${firewall_nat_flags}"
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else
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firewall_nat_flags="if ${firewall_nat_interface} ${firewall_nat_flags}"
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fi
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${fwcmd} nat 123 config log ${firewall_nat_flags}
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${fwcmd} add 50 nat 123 ip4 from any to any via ${firewall_nat_interface}
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fi
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;;
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esac
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esac
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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 firewall_type to ``open''.
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#
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# ${fwcmd} add 65000 pass all from any to any
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# Prototype setups.
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#
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case ${firewall_type} in
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[Oo][Pp][Ee][Nn])
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${fwcmd} add 65000 pass all 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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# Configuration:
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# firewall_client_net: Network address of local IPv4 network.
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# firewall_client_net_ipv6: Network address of local IPv6 network.
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############
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# set this to your local network
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net="$firewall_client_net"
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net6="$firewall_client_net_ipv6"
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# Allow limited broadcast traffic from my own net.
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${fwcmd} add pass all from ${net} to 255.255.255.255
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# Allow any traffic to or from my own net.
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${fwcmd} add pass all from me to ${net}
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${fwcmd} add pass all from ${net} to me
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if [ -n "$net6" ]; then
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${fwcmd} add pass all from me to ${net6}
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${fwcmd} add pass all from ${net6} to me
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fi
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if [ -n "$net6" ]; then
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# Allow any link-local multicast traffic
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${fwcmd} add pass all from fe80::/10 to ff02::/16
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${fwcmd} add pass all from ${net6} to ff02::/16
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# Allow DHCPv6
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${fwcmd} add pass udp from fe80::/10 to me 546
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fi
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# Allow TCP through if setup succeeded
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${fwcmd} add pass tcp from any to any established
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# Allow IP fragments to pass through
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${fwcmd} add pass all from any to any frag
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# Allow setup of incoming email
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${fwcmd} add pass tcp from any to me 25 setup
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# Allow setup of outgoing TCP connections only
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${fwcmd} add pass tcp from me to any setup
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# Disallow setup of all other TCP connections
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${fwcmd} add deny tcp from any to any setup
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# Allow DNS queries out in the world
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${fwcmd} add pass udp from me to any 53 keep-state
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# Allow NTP queries out in the world
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${fwcmd} add pass udp from me to any 123 keep-state
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# Everything else is denied by default, unless the
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# IPFIREWALL_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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# Configuration:
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# firewall_simple_iif: Inside IPv4 network interface.
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# firewall_simple_inet: Inside IPv4 network address.
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# firewall_simple_oif: Outside IPv4 network interface.
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# firewall_simple_onet: Outside IPv4 network address.
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# firewall_simple_iif_ipv6: Inside IPv6 network interface.
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# firewall_simple_inet_ipv6: Inside IPv6 network prefix.
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# firewall_simple_oif_ipv6: Outside IPv6 network interface.
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# firewall_simple_onet_ipv6: Outside IPv6 network prefix.
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############
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BAD_ADDR_TBL=13
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# set these to your outside interface network
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oif="$firewall_simple_oif"
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onet="$firewall_simple_onet"
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oif6="${firewall_simple_oif_ipv6:-$firewall_simple_oif}"
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onet6="$firewall_simple_onet_ipv6"
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# set these to your inside interface network
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iif="$firewall_simple_iif"
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inet="$firewall_simple_inet"
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iif6="${firewall_simple_iif_ipv6:-$firewall_simple_iif}"
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inet6="$firewall_simple_inet_ipv6"
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# Stop spoofing
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${fwcmd} add deny all from ${inet} to any in via ${oif}
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${fwcmd} add deny all from ${onet} to any in via ${iif}
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if [ -n "$inet6" ]; then
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${fwcmd} add deny all from ${inet6} to any in via ${oif6}
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if [ -n "$onet6" ]; then
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${fwcmd} add deny all from ${onet6} to any in \
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via ${iif6}
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fi
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fi
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# Define stuff we should never send out or receive in.
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# Stop RFC1918 nets on the outside interface
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${fwcmd} table ${BAD_ADDR_TBL} flush
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${fwcmd} table ${BAD_ADDR_TBL} add 10.0.0.0/8
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${fwcmd} table ${BAD_ADDR_TBL} add 172.16.0.0/12
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${fwcmd} table ${BAD_ADDR_TBL} add 192.168.0.0/16
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# And stop draft-manning-dsua-03.txt (1 May 2000) nets (includes RESERVED-1,
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# DHCP auto-configuration, NET-TEST, MULTICAST (class D), and class E)
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# on the outside interface
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${fwcmd} table ${BAD_ADDR_TBL} add 0.0.0.0/8
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${fwcmd} table ${BAD_ADDR_TBL} add 169.254.0.0/16
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${fwcmd} table ${BAD_ADDR_TBL} add 192.0.2.0/24
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${fwcmd} table ${BAD_ADDR_TBL} add 224.0.0.0/4
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${fwcmd} table ${BAD_ADDR_TBL} add 240.0.0.0/4
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${fwcmd} add deny all from any to "table($BAD_ADDR_TBL)" via ${oif}
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# Network Address Translation. This rule is placed here deliberately
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# so that it does not interfere with the surrounding address-checking
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# rules. If for example one of your internal LAN machines had its IP
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# address set to 192.0.2.1 then an incoming packet for it after being
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# translated by natd(8) would match the `deny' rule above. Similarly
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# an outgoing packet originated from it before being translated would
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# match the `deny' rule below.
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case ${natd_enable} in
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[Yy][Ee][Ss])
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if [ -n "${natd_interface}" ]; then
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${fwcmd} add divert natd ip4 from any to any via ${natd_interface}
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fi
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;;
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esac
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${fwcmd} add deny all from "table($BAD_ADDR_TBL)" to any via ${oif}
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if [ -n "$inet6" ]; then
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# Stop unique local unicast address on the outside interface
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${fwcmd} add deny all from fc00::/7 to any via ${oif6}
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${fwcmd} add deny all from any to fc00::/7 via ${oif6}
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# Stop site-local on the outside interface
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${fwcmd} add deny all from fec0::/10 to any via ${oif6}
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${fwcmd} add deny all from any to fec0::/10 via ${oif6}
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# Disallow "internal" addresses to appear on the wire.
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${fwcmd} add deny all from ::ffff:0.0.0.0/96 to any \
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via ${oif6}
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${fwcmd} add deny all from any to ::ffff:0.0.0.0/96 \
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via ${oif6}
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# Disallow packets to malicious IPv4 compatible prefix.
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${fwcmd} add deny all from ::224.0.0.0/100 to any via ${oif6}
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${fwcmd} add deny all from any to ::224.0.0.0/100 via ${oif6}
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${fwcmd} add deny all from ::127.0.0.0/104 to any via ${oif6}
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${fwcmd} add deny all from any to ::127.0.0.0/104 via ${oif6}
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${fwcmd} add deny all from ::0.0.0.0/104 to any via ${oif6}
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${fwcmd} add deny all from any to ::0.0.0.0/104 via ${oif6}
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${fwcmd} add deny all from ::255.0.0.0/104 to any via ${oif6}
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${fwcmd} add deny all from any to ::255.0.0.0/104 via ${oif6}
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${fwcmd} add deny all from ::0.0.0.0/96 to any via ${oif6}
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${fwcmd} add deny all from any to ::0.0.0.0/96 via ${oif6}
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# Disallow packets to malicious 6to4 prefix.
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${fwcmd} add deny all from 2002:e000::/20 to any via ${oif6}
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${fwcmd} add deny all from any to 2002:e000::/20 via ${oif6}
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${fwcmd} add deny all from 2002:7f00::/24 to any via ${oif6}
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${fwcmd} add deny all from any to 2002:7f00::/24 via ${oif6}
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${fwcmd} add deny all from 2002:0000::/24 to any via ${oif6}
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${fwcmd} add deny all from any to 2002:0000::/24 via ${oif6}
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${fwcmd} add deny all from 2002:ff00::/24 to any via ${oif6}
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${fwcmd} add deny all from any to 2002:ff00::/24 via ${oif6}
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${fwcmd} add deny all from 2002:0a00::/24 to any via ${oif6}
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${fwcmd} add deny all from any to 2002:0a00::/24 via ${oif6}
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${fwcmd} add deny all from 2002:ac10::/28 to any via ${oif6}
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${fwcmd} add deny all from any to 2002:ac10::/28 via ${oif6}
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${fwcmd} add deny all from 2002:c0a8::/32 to any via ${oif6}
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${fwcmd} add deny all from any to 2002:c0a8::/32 via ${oif6}
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${fwcmd} add deny all from ff05::/16 to any via ${oif6}
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${fwcmd} add deny all from any to ff05::/16 via ${oif6}
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fi
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# Allow TCP through if setup succeeded
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${fwcmd} add pass tcp from any to any established
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# Allow IP fragments to pass through
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${fwcmd} add pass all from any to any frag
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# Allow setup of incoming email
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${fwcmd} add pass tcp from any to me 25 setup
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# Allow access to our DNS
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${fwcmd} add pass tcp from any to me 53 setup
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${fwcmd} add pass udp from any to me 53
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${fwcmd} add pass udp from me 53 to any
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# Allow access to our WWW
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${fwcmd} add pass tcp from any to me 80 setup
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# Reject&Log all setup of incoming connections from the outside
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${fwcmd} add deny log ip4 from any to any in via ${oif} setup proto tcp
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if [ -n "$inet6" ]; then
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${fwcmd} add deny log ip6 from any to any in via ${oif6} \
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setup proto tcp
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fi
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# Allow setup of any other TCP connection
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${fwcmd} add pass tcp from any to any setup
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# Allow DNS queries out in the world
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${fwcmd} add pass udp from me to any 53 keep-state
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# Allow NTP queries out in the world
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${fwcmd} add pass udp from me to any 123 keep-state
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# Everything else is denied by default, unless the
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# IPFIREWALL_DEFAULT_TO_ACCEPT option is set in your kernel
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# config file.
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;;
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[Ww][Oo][Rr][Kk][Ss][Tt][Aa][Tt][Ii][Oo][Nn])
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# Configuration:
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# firewall_myservices: List of ports/protocols on which this
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# host offers services.
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# firewall_allowservices: List of IPv4 and/or IPv6 addresses
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# that have access to
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# $firewall_myservices.
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# firewall_trusted: List of IPv4 and/or IPv6 addresses
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# that have full access to this host.
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# Be very careful when setting this.
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# This option can seriously degrade
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# the level of protection provided by
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# the firewall.
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# firewall_logdeny: Boolean (YES/NO) specifying if the
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# default denied packets should be
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# logged (in /var/log/security).
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# firewall_nologports: List of TCP/UDP ports for which
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# denied incoming packets are not
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# logged.
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# Allow packets for which a state has been built.
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${fwcmd} add check-state
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# For services permitted below.
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${fwcmd} add pass tcp from me to any established
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# Allow any connection out, adding state for each.
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${fwcmd} add pass tcp from me to any setup keep-state
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${fwcmd} add pass udp from me to any keep-state
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${fwcmd} add pass icmp from me to any keep-state
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if [ $ipv6_available -eq 0 ]; then
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${fwcmd} add pass ipv6-icmp from me to any keep-state
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fi
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# Allow DHCP.
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${fwcmd} add pass udp from 0.0.0.0 68 to 255.255.255.255 67 out
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${fwcmd} add pass udp from any 67 to me 68 in
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${fwcmd} add pass udp from any 67 to 255.255.255.255 68 in
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if [ $ipv6_available -eq 0 ]; then
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${fwcmd} add pass udp from fe80::/10 to me 546 in
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fi
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# Some servers will ping the IP while trying to decide if it's
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# still in use.
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${fwcmd} add pass icmp from any to any icmptype 8
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if [ $ipv6_available -eq 0 ]; then
|
|
${fwcmd} add pass ipv6-icmp from any to any icmp6type 128,129
|
|
fi
|
|
|
|
# Allow "mandatory" ICMP in.
|
|
${fwcmd} add pass icmp from any to any icmptype 3,4,11
|
|
if [ $ipv6_available -eq 0 ]; then
|
|
${fwcmd} add pass ipv6-icmp from any to any icmp6type 3
|
|
fi
|
|
|
|
# Add permits for this workstations published services below
|
|
# Only IPs and nets in firewall_allowservices is allowed in.
|
|
# If you really wish to let anyone use services on your
|
|
# workstation, then set "firewall_allowservices='any'" in /etc/rc.conf
|
|
#
|
|
# Note: We don't use keep-state as that would allow DoS of
|
|
# our statetable.
|
|
# You can add 'keep-state' to the lines for slightly
|
|
# better performance if you fell that DoS of your
|
|
# workstation won't be a problem.
|
|
#
|
|
for i in ${firewall_allowservices} ; do
|
|
for j in ${firewall_myservices} ; do
|
|
case $j in
|
|
[0-9A-Za-z]*/[Pp][Rr][Oo][Tt][Oo])
|
|
${fwcmd} add pass ${j%/[Pp][Rr][Oo][Tt][Oo]} from $i to me
|
|
;;
|
|
[0-9A-Za-z]*/[Tt][Cc][Pp])
|
|
${fwcmd} add pass tcp from $i to me ${j%/[Tt][Cc][Pp]}
|
|
;;
|
|
[0-9A-Za-z]*/[Uu][Dd][Pp])
|
|
${fwcmd} add pass udp from $i to me ${j%/[Uu][Dd][Pp]}
|
|
;;
|
|
*[0-9A-Za-z])
|
|
echo "Consider using ${j}/tcp in firewall_myservices." \
|
|
> /dev/stderr
|
|
${fwcmd} add pass tcp from $i to me $j
|
|
;;
|
|
*)
|
|
echo "Invalid port in firewall_myservices: $j" > /dev/stderr
|
|
;;
|
|
esac
|
|
done
|
|
done
|
|
|
|
# Allow all connections from trusted IPs.
|
|
# Playing with the content of firewall_trusted could seriously
|
|
# degrade the level of protection provided by the firewall.
|
|
for i in ${firewall_trusted} ; do
|
|
${fwcmd} add pass ip from $i to me
|
|
done
|
|
|
|
${fwcmd} add 65000 count ip from any to any
|
|
|
|
# Drop packets to ports where we don't want logging
|
|
for i in ${firewall_nologports} ; do
|
|
${fwcmd} add deny { tcp or udp } from any to any $i in
|
|
done
|
|
|
|
# Broadcasts and multicasts
|
|
${fwcmd} add deny ip from any to 255.255.255.255
|
|
${fwcmd} add deny ip from any to 224.0.0.0/24 in # XXX
|
|
|
|
# Noise from routers
|
|
${fwcmd} add deny udp from any to any 520 in
|
|
|
|
# Noise from webbrowsing.
|
|
# The stateful filter is a bit aggressive, and will cause some
|
|
# connection teardowns to be logged.
|
|
${fwcmd} add deny tcp from any 80,443 to any 1024-65535 in
|
|
|
|
# Deny and (if wanted) log the rest unconditionally.
|
|
log=""
|
|
if [ ${firewall_logdeny:-x} = "YES" -o ${firewall_logdeny:-x} = "yes" ] ; then
|
|
log="log logamount 500" # The default of 100 is too low.
|
|
sysctl net.inet.ip.fw.verbose=1 >/dev/null
|
|
fi
|
|
${fwcmd} add deny $log ip from any to any
|
|
;;
|
|
|
|
[Cc][Ll][Oo][Ss][Ee][Dd])
|
|
${fwcmd} add 65000 deny ip from any to any
|
|
;;
|
|
[Uu][Nn][Kk][Nn][Oo][Ww][Nn])
|
|
;;
|
|
*)
|
|
if [ -r "${firewall_type}" ]; then
|
|
${fwcmd} ${firewall_flags} ${firewall_type}
|
|
fi
|
|
;;
|
|
esac
|