[FUGSPBR] RC.FIREWALL
freebsdsp em bol.com.br
freebsdsp em bol.com.br
Ter Maio 29 18:05:32 BRT 2001
Bem Senhores preciso de uma ajuda,
gostaria de configurar meu firewall para bloquear o
acesso ao icq dentro da minha rede,napster
e á alguns sites.
Bem não tenho a minima idéia como fazer isso
gostaria que algum dos senhores pudesse me mostra
apartir do meu rc.firewall que segue logo abaixo .
Obrigado
---------------------------------------------------------
----------------
# 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 1.30.2.12 2001/03/06
01:58:02 obrien Exp $
#
#
# Setup system for firewall service.
#
# Suck in the configuration variables.
if [ -r /etc/defaults/rc.conf ]; then
. /etc/defaults/rc.conf
source_rc_confs
elif [ -r /etc/rc.conf ]; then
. /etc/rc.conf
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
# 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 & Internet Security
# Repelling the wily hacker
# William R. Cheswick, Steven M. Bellowin
#
# Addison-Wesley
# ISBN 0-201-63357-4
# http://www.awl.com/
# http://www.awlonline.com/product/0%2C2627%
2C0201633574%2C00.html
#
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
############
# 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 all
from any to any via ${natd_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
############
# 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
${fwcmd} add 300 deny ip from 127.0.0.0/8 to any
# If you're using 'options BRIDGE', uncomment the
following line to pass ARP
#${fwcmd} add 400 pass udp from 0.0.0.0 2054 to 0.0.0.0
# 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 ${ip} 25 setup
# Allow setup of outgoing TCP connections only
${fwcmd} add pass tcp from ${ip} 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 ${ip} to any 53 keep-
state
# Allow NTP queries out in the world
${fwcmd} add pass udp from ${ip} 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 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="192.0.2.0"
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 ${oip} to any 123
keep-state
# Everything else is denied by default, unless
the
# IPFIREWALL_DEFAULT_TO_ACCEPT option is set in
your kernel
# config file.
;;
[Uu][Nn][Kk][Nn][Oo][Ww][Nn])
;;
*)
if [ -r "${firewall_type}" ]; then
${fwcmd} ${firewall_flags}
${firewall_type}
fi
;;
esac
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