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Date:      Mon, 23 Apr 2001 21:17:26 -0400 (EDT)
From:      "Gerald T. Freymann" <freymann@scaryg.shacknet.nu>
To:        <freebsd-questions@freebsd.org>
Subject:   ipfw question
Message-ID:  <20010423211304.X2868-100000@scaryg.shacknet.nu>
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Ok...

So I got PPPoE working, and IPFW and NATD going as well.

From behing my beautiful FreeBSD 4.3RC5 machine, my Win98 machine would
like to use Funk Software's Proxy program to access a server on the
outside world...

Figured this was be an easy one, but apparently it ain't!

Here's my rc.ipfw file. I added the Proxy stuff, well, where noted!

# rc.ipfw - Firewall Rules
#
# This file is a modified version of /etc/rc.firewall.
#
# Maintained by:  D. O'Connor
# Modified:       7/18/2000.
#

# 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

if [ -n "${1}" ]; then
        firewall_type="${1}"
fi

# Firewall program
fwcmd="/sbin/ipfw"

# Outside interface network and netmask and ip
oif="tun0"
#onet="123.45.67.0"
omask="255.255.255.0"
#oip="123.45.67.89"

# Inside interface network and netmask and ip
iif="vr0"
inet="192.168.0.0"
imask="255.255.255.0"
iip="192.168.0.1"

# My ISP's DNS servers
dns1="204.101.251.1"
dns2="204.101.251.2"

# Flush previous rules
${fwcmd} -f flush

# Allow loopbacks, deny imposters
${fwcmd} add 100 pass all from any to any via lo0
${fwcmd} add 200 deny all from any to 127.0.0.0/8

# If you're using 'options BRIDGE', uncomment the following line to pass ARP
#${fwcmd} add 300 pass udp from 0.0.0.0 2054 to 0.0.0.0

# Stop spoofing
#${fwcmd} add deny log all from ${inet}:${imask} to any in via ${oif}
${fwcmd} add deny log all from me to any in via ${oif}
${fwcmd} add deny log 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.
${fwcmd} add divert natd all from any to any via ${natd_interface}

# 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 log 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 established connections with minimal overhead
${fwcmd} add pass tcp from any to any established

# Allow IP fragments to pass through
${fwcmd} add pass all from any to any frag


### TCP RULES

# HTTP - Allow access to our web server
${fwcmd} add pass tcp from any to any 80 setup

# SMTP - Allow access to sendmail for incoming e-mail
${fwcmd} add pass tcp from any to any 25 setup

# FTP - Allow incoming data channel for outgoing connections,
# reject & log all incoming control connections
${fwcmd} add pass tcp from any 20 to any 1024-65535 setup
${fwcmd} add deny log tcp from any to any 21 in via ${oif} setup

# SSH Login - Allow & Log all incoming
${fwcmd} add pass log tcp from any to any 22 in via ${oif} setup

# Proxy - Allow and Log
${fwcmd} add pass log tcp from any to any 1505 out via tun0
${fwcmd} add pass log udp from any to any 1505 in via tun0
#${fwcmd} add pass log udp from any to any 1505 via ${oif} setup
#${fwcmd} add pass log udp from any to any 1505 via ${iif} setup

# IDENT - Reset incoming connections
${fwcmd} add reset tcp from any to any 113 in via ${oif} 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


### UDP RULES

# DNS - Allow queries out in the world
${fwcmd} add pass udp from any to ${dns1} 53
${fwcmd} add pass udp from any to ${dns2} 53
${fwcmd} add pass udp from ${dns1} 53 to any
${fwcmd} add pass udp from ${dns2} 53 to any

# SMB - Allow local traffic
${fwcmd} add pass udp from any to any 137-139 via ${iif}

# SYSLOG - Allow machines on inside net to log to us.
${fwcmd} add pass log udp from any to any 514 via ${iif}

# NTP - Allow queries out in the world
${fwcmd} add pass udp from any 123 to any 123 via ${oif}
${fwcmd} add pass udp from any 123 to any via ${iif}
${fwcmd} add pass udp from any to any 123 via ${iif}

# TRACEROUTE - Allow outgoing
${fwcmd} add pass udp from any to any 33434-33523 out via ${oif}


### ICMP RULES

# ICMP packets
# Allow all ICMP packets on internal interface
${fwcmd} add pass icmp from any to any via ${iif}

# Allow outgoing pings
${fwcmd} add pass icmp from any to any icmptypes 8 out via ${oif}
${fwcmd} add pass icmp from any to any icmptypes 0 in via ${oif}

# Allow Destination Unreachable, Source Quench, Time Exceeded, and Bad
Header
${fwcmd} add pass icmp from any to any icmptypes 3,4,11,12 via ${oif}

# Deny the rest of them
${fwcmd} add deny log icmp from any to any


### MISCELLANEOUS REJECT RULES

# Reject broadcasts from outside interface
${fwcmd} add 63000 deny log ip from any to 0.0.0.255:0.0.0.255 in via
${oif}

# Reject&Log SMB connections on outside interface
${fwcmd} add 64000 deny log udp from any to any 137-139 via ${oif}

# Reject&Log all other connections from outside interface
${fwcmd} add 65000 deny log ip from any to any via ${oif}

# Everything else is denied by default, unless the
# IPFIREWALL_DEFAULT_TO_ACCEPT option is set in your kernel
# config file.


 i've tried a few variations but can't seem to get proxy to even see the
outside world....

 The default firewall file is so big!! I've even added "log" statements to
most of the deny entries but nothing is showing up in /var/log/security to
help out.

 Suggestions?

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
 Scary Gerry -- Senior Systems Manager
 freymann@scaryg.shacknet.nu
 Now enjoying FreeBSD 4.3RC5 along with
 GNOME and starfish Windows manager
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-



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