Date: Thu, 25 Apr 2002 15:29:05 -0400 From: Bill Moran <wmoran@potentialtech.com> To: Carolyn Longfoot <c_longfoot@hotmail.com> Cc: freebsd-questions@freebsd.org Subject: Re: rc.firewall problems Message-ID: <3CC85901.7020308@potentialtech.com> References: <F139xSLRKybIFycsa1N0000c049@hotmail.com>
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Carolyn Longfoot wrote:
> If anybody could point me to what I'm missing I'd appreciate it. I am
> running NAT and to get anything to work I added the rows marked with ===
> (not marked in the actual file of course). That feels pretty wrong and
> I'm especially puzzled why BOTH are needed, i can see that 'sh
> rc.firewall' executed the nat rule further down so why would the first
> one make a difference?
Do you have the proper settings in /etc/rc.conf to set the variables
for natd_interface correctly?
Reboot your system and then do
ipfw show > somefile.txt
and compare the contents of that file with what you think it should be
doing
>
> Cheers,
>
> Caro
>
> # set these to your outside interface network and netmask and ip
> oif="rl0"
> onet="1.1.1.0"
> omask="255.255.255.252"
> oip="1.1.1.1"
>
> # set these to your inside interface network and netmask and ip
> iif="rl1"
> inet="10.0.0.0"
> imask="255.255.255.0"
> iip="10.0.0.1"
>
> === ${fwcmd} add divert natd all from any to any via ${oif}
> === ${fwcmd} add pass all from any to any
>
> # 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}
>
> ${fwcmd} add pass all from any to any via ${iif}
> ${fwcmd} add pass all from ${onet}:${omask} to any out 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 any 53 to ${oip}
> ${fwcmd} add pass udp from ${oip} to any 53
>
> # Allow NTP queries out in the world
> ${fwcmd} add pass udp from any 123 to ${oip}
> ${fwcmd} add pass udp from ${oip} to any 123
>
> # Everything else is denied by default, unless the
> # IPFIREWALL_DEFAULT_TO_ACCEPT option is set in your kernel
> # config file.
> ;;
>
>
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--
Bill Moran
Potential Technology
http://www.potentialtech.com
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