mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-24 11:29:10 +00:00
158 lines
4.7 KiB
Plaintext
158 lines
4.7 KiB
Plaintext
############
|
|
# Setup system for firewall service.
|
|
# $Id: rc.firewall,v 1.5 1996/08/19 15:34:29 wosch Exp $
|
|
|
|
############
|
|
#
|
|
# >>Warning<<
|
|
# This file is not very old yet, and have been put together without much
|
|
# testing of the contents.
|
|
|
|
# Set this to be the type of firewall you want: open, client, simple or NONE.
|
|
# ``open'' will allow anyone in, ``client'' will try to protect just one
|
|
# machine and ``simple'' will try to protect a whole network (entries should
|
|
# be customized appropriately below). To let no one in, use NONE.
|
|
|
|
firewall_type=NONE
|
|
|
|
|
|
############
|
|
#
|
|
# If you don't know enough about packet filtering, we suggest that you
|
|
# take time to read this book:
|
|
#
|
|
# Building Internet Firewalls
|
|
# Brent Chapman and Elizabeth Zwicky
|
|
#
|
|
# O'Reilly & Associates, Inc
|
|
# ISBN 1-56592-124-0
|
|
#
|
|
# For a more advanced treatment of Internet Security read:
|
|
#
|
|
# Firewalls & Internet Security
|
|
# Repelling the wily hacker
|
|
# William R. Cheswick, Steven M. Bellowin
|
|
#
|
|
# Addison-Wesley
|
|
# ISBN 0-201-6337-4
|
|
#
|
|
|
|
############
|
|
# Flush out the list before we begin.
|
|
/sbin/ipfw -f flush
|
|
|
|
############
|
|
# 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
|
|
# they 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''.
|
|
|
|
# /sbin/ipfw add 65000 pass all from any to any
|
|
|
|
############
|
|
# Only in rare cases do you want to change this rule
|
|
/sbin/ipfw add 1000 pass all from 127.0.0.1 to 127.0.0.1
|
|
|
|
|
|
# Prototype setups.
|
|
if [ "${firewall_type}" = "open" ]; then
|
|
|
|
/sbin/ipfw add 65000 pass all from any to any
|
|
|
|
elif [ "${firewall_type}" = "client" ]; then
|
|
|
|
############
|
|
# 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="192.168.4.0"
|
|
mask="255.255.255.0"
|
|
ip="192.168.4.17"
|
|
|
|
# Allow any traffic to or from my own net.
|
|
/sbin/ipfw add pass all from ${ip} to ${net}:${mask}
|
|
/sbin/ipfw add pass all from ${net}:${mask} to ${ip}
|
|
|
|
# Allow TCP through if setup succeeded
|
|
/sbin/ipfw add pass tcp from any to any established
|
|
|
|
# Allow setup of incoming email
|
|
/sbin/ipfw add pass tcp from any to ${ip} 25 setup
|
|
|
|
# Allow setup of outgoing TCP connections only
|
|
/sbin/ipfw add pass tcp from ${ip} to any setup
|
|
|
|
# Disallow setup of all other TCP connections
|
|
/sbin/ipfw add deny tcp from any to any setup
|
|
|
|
# Allow DNS queries out in the world
|
|
/sbin/ipfw add pass udp from any 53 to ${ip}
|
|
/sbin/ipfw add pass udp from ${ip} to any 53
|
|
|
|
# Allow NTP queries out in the world
|
|
/sbin/ipfw add pass udp from any 123 to ${ip}
|
|
/sbin/ipfw add pass udp from ${ip} to any 123
|
|
|
|
# Everyting else is denied as default.
|
|
|
|
elif [ "${firewall_type}" = "simple" ]; then
|
|
|
|
############
|
|
# This is a prototype setup for a simple firewall. Configure this machine
|
|
# as a named server 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="192.168.4.0"
|
|
omask="255.255.255.0"
|
|
oip="192.168.4.17"
|
|
|
|
# set these to your inside interface network and netmask and ip
|
|
iif="ed1"
|
|
inet="192.168.3.0"
|
|
imask="255.255.255.0"
|
|
iip="192.168.3.17"
|
|
|
|
# Stop spoofing
|
|
/sbin/ipfw add deny all from ${inet}:${imask} to any in via ${oif}
|
|
/sbin/ipfw add deny all from ${onet}:${omask} to any in via ${iif}
|
|
|
|
# Stop RFC1918 nets on the outside interface
|
|
/sbin/ipfw add deny all from 192.168.0.0:255.255.0.0 to any via ${oif}
|
|
/sbin/ipfw add deny all from 172.16.0.0:255.240.0.0 to any via ${oif}
|
|
/sbin/ipfw add deny all from 10.0.0.0:255.0.0.0 to any via ${oif}
|
|
|
|
# Allow TCP through if setup succeeded
|
|
/sbin/ipfw add pass tcp from any to any established
|
|
|
|
# Allow setup of incoming email
|
|
/sbin/ipfw add pass tcp from any to ${oip} 25 setup
|
|
|
|
# Allow access to our DNS
|
|
/sbin/ipfw add pass tcp from any to ${oip} 53 setup
|
|
|
|
# Allow access to our WWW
|
|
/sbin/ipfw add pass tcp from any to ${oip} 80 setup
|
|
|
|
# Reject&Log all setup of incoming connections from the outside
|
|
/sbin/ipfw add deny log tcp from any to any in via ${oif} setup
|
|
|
|
# Allow setup of any other TCP connection
|
|
/sbin/ipfw add pass tcp from any to any setup
|
|
|
|
# Allow DNS queries out in the world
|
|
/sbin/ipfw add pass udp from any 53 to ${oip}
|
|
/sbin/ipfw add pass udp from ${oip} to any 53
|
|
|
|
# Allow NTP queries out in the world
|
|
/sbin/ipfw add pass udp from any 123 to ${oip}
|
|
/sbin/ipfw add pass udp from ${oip} to any 123
|
|
|
|
# Everyting else is denied as default.
|
|
fi
|
|
|