Add skeleton firewall setup(s). Comments very welcome.
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phk
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2175aad509
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@ -1,5 +1,5 @@
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# from: @(#)Makefile 5.11 (Berkeley) 5/21/91
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# $Id: Makefile,v 1.134 1996/03/17 20:37:03 phk Exp $
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# $Id: Makefile,v 1.135 1996/03/22 17:28:07 nate Exp $
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# -rw-r--r--
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BINOWN= root
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@ -8,7 +8,8 @@ BIN1= aliases amd.map csh.cshrc csh.login csh.logout dm.conf \
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ftpusers gettytab group hosts host.conf hosts.equiv hosts.lpd \
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inetd.conf login.access motd modems netstart networks \
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newsyslog.conf phones pccard.conf.sample printcap profile protocols \
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rc rc.local rc.pccard rc.serial etc.${MACHINE}/rc.${MACHINE} \
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rc rc.firewall rc.local rc.pccard rc.serial \
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etc.${MACHINE}/rc.${MACHINE} \
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remote security services sysconfig shells \
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syslog.conf ttys etc.${MACHINE}/disktab rpc make.conf \
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${.CURDIR}/../gnu/usr.bin/man/manpath/manpath.config \
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@ -1,6 +1,6 @@
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#!/bin/sh -
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#
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# $Id: netstart,v 1.41 1996/02/09 12:45:37 jkh Exp $
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# $Id: netstart,v 1.42 1996/02/11 04:07:25 jkh Exp $
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# From: @(#)netstart 5.9 (Berkeley) 3/30/91
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# Note that almost all the user-configurable behavior is no longer in
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@ -23,6 +23,11 @@ if [ -n "$defaultdomainname" -a "x$defaultdomainname" != "xNO" ] ; then
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domainname $defaultdomainname
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fi
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# If IP filtering
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if [ -n "$firewall" -a "x$firewall" != "xNO" -f /etc/rc.firewall ] ; then
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sh /etc/rc.firewall
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fi
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#
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# XXX This is known to cause an error if /usr is nfs mounted since it
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# will not be available until after the network is up :-(. Once the
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133
etc/rc.firewall
Normal file
133
etc/rc.firewall
Normal file
@ -0,0 +1,133 @@
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############
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# Setup system for firewall service.
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# $Id$
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############
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#
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# >>Warning<<
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# This file is not very old yet, and have been put together without much
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# test of the contents.
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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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# Firewalls & Internet Security
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# Repelling the wily hacker
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# William R. Cheswick, Steven M. Bellowin
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#
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# Addison-Wesley
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# ISBN 0-201-6337-4
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#
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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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# they you will want to change the default policy to open.
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# /sbin/ipfw add 65000 pass all from any to any
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############
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# Only in rare cases do you want to change this rule
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/sbin/ipfw add 1000 pass all from 127.0.0.1 to 127.0.0.1
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############
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# This is a prototype setup that will protect your system somewhat against
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# people from outside your own network.
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#
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# To enable simply change "false" to "true" in the if line and set the
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# variables to your network parameters
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if false ; then
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# set these to your network and netmask and ip
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net="192.168.4.0"
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mask="255.255.255.0"
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ip="192.168.4.17"
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# Allow any traffic to or from my own net.
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/sbin/ipfw add pass all from ${ip} to ${net}:${mask}
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/sbin/ipfw add pass all from ${net}:${mask} to ${ip}
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# Allow TCP through if setup succeeded
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/sbin/ipfw add deny tcp from any to any established
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# Allow setup of incoming email
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/sbin/ipfw add pass tcp from any to ${ip} 25 setup
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# Allow setup of outgoing TCP connections only
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/sbin/ipfw add pass tcp from ${ip} to any setup
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# Disallow setup of all other TCP connections
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/sbin/ipfw add deny tcp from any to any setup
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# Allow DNS queries out in the world
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/sbin/ipfw add pass udp from any 53 to ${ip}
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/sbin/ipfw add pass udp from ${ip} to any 53
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# Allow NTP queries out in the world
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/sbin/ipfw add pass udp from any 123 to ${ip}
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/sbin/ipfw add pass udp from ${ip} to any 123
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# Everyting else is denied as default.
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fi
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############
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# This is a prototype setup for a simple firewall. Configure this machine
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# as a named server and ntp server, and point all the machines on the inside
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# at this machine for those services.
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#
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# To enable simply change "false" to "true" in the if line and set the
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# variables to your network parameters
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if false ; then
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# set these to your outside interface network and netmask and ip
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oif="ed0"
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onet="192.168.4.0"
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omask="255.255.255.0"
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oip="192.168.4.17"
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# set these to your inside interface network and netmask and ip
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iif="ed1"
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inet="192.168.3.0"
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imask="255.255.255.0"
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iip="192.168.3.17"
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# Stop spoofing
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/sbin/ipfw add deny all from ${inet}:${imask} to any in via ${oif}
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/sbin/ipfw add deny all from ${onet}:${omask} to any in via ${iif}
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# Stop RFC1918 nets on the outside interface
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/sbin/ipfw add deny all from 192.168.0.0:255.255.0.0 to any via ${oif}
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/sbin/ipfw add deny all from 172.16.0.0:255.240.0.0 to any via ${oif}
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/sbin/ipfw add deny all from 10.0.0.0:255.0.0.0 to any via ${oif}
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# Allow TCP through if setup succeeded
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/sbin/ipfw add deny tcp from any to any established
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# Allow setup of incoming email
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/sbin/ipfw add pass tcp from any to ${oip} 25 setup
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# Allow access to our DNS
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/sbin/ipfw add pass tcp from any to ${oip} 53 setup
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# Allow access to our WWW
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/sbin/ipfw add pass tcp from any to ${oip} 80 setup
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# Reject&Log all setup of incoming connections from the outside
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/sbin/ipfw add deny log tcp from any to any in via ${oif} setup
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# Allow setup of any other TCP connection
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/sbin/ipfw add pass tcp from any to any setup
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# Allow DNS queries out in the world
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/sbin/ipfw add pass udp from any 53 to ${oip}
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/sbin/ipfw add pass udp from ${oip} to any 53
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# Allow NTP queries out in the world
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/sbin/ipfw add pass udp from any 123 to ${oip}
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/sbin/ipfw add pass udp from ${oip} to any 123
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# Everyting else is denied as default.
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fi
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@ -4,7 +4,7 @@
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# This is sysconfig - a file full of useful variables that you can set
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# to change the default startup behavior of your system.
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#
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# $Id: sysconfig,v 1.41 1996/03/12 15:39:26 nate Exp $
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# $Id: sysconfig,v 1.42 1996/03/14 18:24:07 nate Exp $
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######################### Start Of Local Configuration Section ###########
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@ -191,6 +191,9 @@ kerberos_server=NO
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# If you want this host to be a gateway, set to YES.
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gateway=NO
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# If you want this host to be a firewall or otherwise filter IP, set to YES.
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firewall=NO
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# Set to YES if you wish to check quotas. NOTE: For now this probably
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# doesn't work and should be left disabled.
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check_quotas=NO
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