[FUGSPBR] RADIO - HELP

freebsdsp em bol.com.br freebsdsp em bol.com.br
Ter Maio 29 18:04:55 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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