+#!/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: src/etc/rc.firewall,v 1.52.4.1 2008/01/29 00:22:32 dougb Exp $
+#
+
+#
+# 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
+ ${fwcmd} nat 123 config if ${firewall_nat_interface} log
+ ${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 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
git://git.onelab.eu / ipfw.git / commitdiff