#!/bin/sh - # Copyright (c) 1996 Poul-Henning Kamp # All rights reserved. # # Redistribution and use in source and binary forms, with or without # modification, are permitted provided that the following conditions # are met: # 1. Redistributions of source code must retain the above copyright # notice, this list of conditions and the following disclaimer. # 2. Redistributions in binary form must reproduce the above copyright # notice, this list of conditions and the following disclaimer in the # documentation and/or other materials provided with the distribution. # # THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE # ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS # OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF # SUCH DAMAGE. # # $FreeBSD$ # # # Setup system for ipfw(4) firewall service. # # 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 # workstation - will try to protect just this machine using statefull # firewalling. See below for rc.conf variables used # 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 and Internet Security: Repelling the Wily Hacker, 2nd Edition # William R. Cheswick, Steven M. Bellowin, Aviel D. Rubin # # Addison-Wesley / Prentice Hall # ISBN 0-201-63466-X # http://www.pearsonhighered.com/ # http://www.pearsonhighered.com/educator/academic/product/0,3110,020163466X,00.html # setup_loopback () { ############ # Only in rare cases do you want to change these rules # ${fwcmd} add 100 pass all from any to any via lo0 ${fwcmd} add 200 deny all from any to 127.0.0.0/8 ${fwcmd} add 300 deny ip from 127.0.0.0/8 to any } if [ -n "${1}" ]; then firewall_type="${1}" fi ############ # Set quiet mode if requested # case ${firewall_quiet} in [Yy][Ee][Ss]) fwcmd="/sbin/ipfw -q" ;; *) fwcmd="/sbin/ipfw" ;; esac ############ # Flush out the list before we begin. # ${fwcmd} -f flush setup_loopback ############ # Network Address Translation. All packets are passed to natd(8) # before they encounter your remaining rules. The firewall rules # will then be run again on each packet after translation by natd # starting at the rule number following the divert rule. # # For ``simple'' firewall type the divert rule should be put to a # different place to not interfere with address-checking rules. # case ${firewall_type} in [Oo][Pp][Ee][Nn]|[Cc][Ll][Ii][Ee][Nn][Tt]) case ${natd_enable} in [Yy][Ee][Ss]) if [ -n "${natd_interface}" ]; then ${fwcmd} add 50 divert natd ip4 from any to any via ${natd_interface} fi ;; esac case ${firewall_nat_enable} in [Yy][Ee][Ss]) if [ -n "${firewall_nat_interface}" ]; then if echo "${firewall_nat_interface}" | \ grep -q -E '^[0-9]+(\.[0-9]+){0,3}$'; then firewall_nat_flags="ip ${firewall_nat_interface} ${firewall_nat_flags}" else firewall_nat_flags="if ${firewall_nat_interface} ${firewall_nat_flags}" fi ${fwcmd} nat 123 config log ${firewall_nat_flags} ${fwcmd} add 50 nat 123 ip4 from any to any via ${firewall_nat_interface} fi ;; esac esac ############ # 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 firewall_type to ``open''. # # ${fwcmd} add 65000 pass all from any to any # Prototype setups. # case ${firewall_type} in [Oo][Pp][Ee][Nn]) ${fwcmd} 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 netmask and ip net="192.0.2.0" mask="255.255.255.0" ip="192.0.2.1" # Allow limited broadcast traffic from my own net. ${fwcmd} add pass all from ${net}:${mask} to 255.255.255.255 # Allow any traffic to or from my own net. ${fwcmd} add pass all from ${ip} to ${net}:${mask} ${fwcmd} add pass all from ${net}:${mask} to ${ip} # Allow TCP through if setup succeeded ${fwcmd} add pass tcp from any to any established # Allow IP fragments to pass through ${fwcmd} add pass all from any to any frag # Allow setup of incoming email ${fwcmd} add pass tcp from any to me 25 setup # Allow setup of outgoing TCP connections only ${fwcmd} add pass tcp from me to any setup # Disallow setup of all other TCP connections ${fwcmd} add deny tcp from any to any setup # Allow DNS queries out in the world ${fwcmd} add pass udp from me to any 53 keep-state # Allow NTP queries out in the world ${fwcmd} add pass udp from me to any 123 keep-state # Everything else is denied by default, unless the # IPFIREWALL_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 DNS 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 netmask and ip oif="ed0" onet="192.0.2.0" omask="255.255.255.240" oip="192.0.2.1" # set these to your inside interface network and netmask and ip iif="ed1" inet="192.0.2.16" imask="255.255.255.240" iip="192.0.2.17" # Stop spoofing ${fwcmd} add deny all from ${inet}:${imask} to any in via ${oif} ${fwcmd} add deny all from ${onet}:${omask} to any in via ${iif} # Stop RFC1918 nets on the outside interface ${fwcmd} add deny all from any to 10.0.0.0/8 via ${oif} ${fwcmd} add deny all from any to 172.16.0.0/12 via ${oif} ${fwcmd} add deny all from any to 192.168.0.0/16 via ${oif} # Stop draft-manning-dsua-03.txt (1 May 2000) nets (includes RESERVED-1, # DHCP auto-configuration, NET-TEST, MULTICAST (class D), and class E) # on the outside interface ${fwcmd} add deny all from any to 0.0.0.0/8 via ${oif} ${fwcmd} add deny all from any to 169.254.0.0/16 via ${oif} ${fwcmd} add deny all from any to 192.0.2.0/24 via ${oif} ${fwcmd} add deny all from any to 224.0.0.0/4 via ${oif} ${fwcmd} add deny all from any to 240.0.0.0/4 via ${oif} # Network Address Translation. This rule is placed here deliberately # so that it does not interfere with the surrounding address-checking # rules. If for example one of your internal LAN machines had its IP # address set to 192.0.2.1 then an incoming packet for it after being # translated by natd(8) would match the `deny' rule above. Similarly # an outgoing packet originated from it before being translated would # match the `deny' rule below. case ${natd_enable} in [Yy][Ee][Ss]) if [ -n "${natd_interface}" ]; then ${fwcmd} add divert natd all from any to any via ${natd_interface} fi ;; esac # Stop RFC1918 nets on the outside interface ${fwcmd} add deny all from 10.0.0.0/8 to any via ${oif} ${fwcmd} add deny all from 172.16.0.0/12 to any via ${oif} ${fwcmd} add deny all from 192.168.0.0/16 to any via ${oif} # Stop draft-manning-dsua-03.txt (1 May 2000) nets (includes RESERVED-1, # DHCP auto-configuration, NET-TEST, MULTICAST (class D), and class E) # on the outside interface ${fwcmd} add deny all from 0.0.0.0/8 to any via ${oif} ${fwcmd} add deny all from 169.254.0.0/16 to any via ${oif} ${fwcmd} add deny all from 192.0.2.0/24 to any via ${oif} ${fwcmd} add deny all from 224.0.0.0/4 to any via ${oif} ${fwcmd} add deny all from 240.0.0.0/4 to any via ${oif} # Allow TCP through if setup succeeded ${fwcmd} add pass tcp from any to any established # Allow IP fragments to pass through ${fwcmd} add pass all from any to any frag # Allow setup of incoming email ${fwcmd} add pass tcp from any to ${oip} 25 setup # Allow access to our DNS ${fwcmd} add pass tcp from any to ${oip} 53 setup ${fwcmd} add pass udp from any to ${oip} 53 ${fwcmd} add pass udp from ${oip} 53 to any # Allow access to our WWW ${fwcmd} add pass tcp from any to ${oip} 80 setup # Reject&Log all setup of incoming connections from the outside ${fwcmd} add deny log tcp from any to any in via ${oif} setup # Allow setup of any other TCP connection ${fwcmd} add pass tcp from any to any setup # Allow DNS queries out in the world ${fwcmd} add pass udp from ${oip} to any 53 keep-state # Allow NTP queries out in the world ${fwcmd} add pass udp from ${oip} to any 123 keep-state # Everything else is denied by default, unless the # IPFIREWALL_DEFAULT_TO_ACCEPT option is set in your kernel # config file. ;; [Ww][Oo][Rr][Kk][Ss][Tt][Aa][Tt][Ii][Oo][Nn]) # Configuration: # firewall_myservices: List of TCP ports on which this host # offers services. # firewall_allowservices: List of IPs which has access to # $firewall_myservices. # firewall_trusted: List of IPs which has full access # to this host. Be very carefull # when setting this. This option can # seriously degrade the level of # protection provided by the firewall. # firewall_logdeny: Boolean (YES/NO) specifying if the # default denied packets should be # logged (in /var/log/security). # firewall_nologports: List of TCP/UDP ports for which # denied incomming packets are not # logged. # Allow packets for which a state has been built. ${fwcmd} add check-state # For services permitted below. ${fwcmd} add pass tcp from me to any established # Allow any connection out, adding state for each. ${fwcmd} add pass tcp from me to any setup keep-state ${fwcmd} add pass udp from me to any keep-state ${fwcmd} add pass icmp from me to any keep-state # Allow DHCP. ${fwcmd} add pass udp from 0.0.0.0 68 to 255.255.255.255 67 out ${fwcmd} add pass udp from any 67 to me 68 in ${fwcmd} add pass udp from any 67 to 255.255.255.255 68 in # Some servers will ping the IP while trying to decide if it's # still in use. ${fwcmd} add pass icmp from any to any icmptype 8 # Allow "mandatory" ICMP in. ${fwcmd} add pass icmp from any to any icmptype 3,4,11 # 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 ${fwcmd} add pass tcp from $i to me $j 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 muticasts ${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 statefull filter is a bit agressive, 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