radius.m4: Take over NAT duties.

[firewall] / radius.m4

### -*-sh-*-
###
### Firewall configuration for radius
###
### (c) 2008 Mark Wooding
###

###----- Licensing notice ---------------------------------------------------
###
### This program is free software; you can redistribute it and/or modify
### it under the terms of the GNU General Public License as published by
### the Free Software Foundation; either version 2 of the License, or
### (at your option) any later version.
###
### This program is distributed in the hope that it will be useful,
### but WITHOUT ANY WARRANTY; without even the implied warranty of
### MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
### GNU General Public License for more details.
###
### You should have received a copy of the GNU General Public License
### along with this program; if not, write to the Free Software Foundation,
### Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

###--------------------------------------------------------------------------
### Config settings.

## This router is involved in a routing asymmetry.
setconf(rp_filter, 0)
setconf(log_martians, 0)

###--------------------------------------------------------------------------
### Network interfaces.

m4_divert(44)m4_dnl
## Interface definitions.
if_dmz=eth0
if_trusted=eth1
if_safe=eth2
if_untrusted=eth3
if_vpn=$if_dmz,$if_trusted
if_iodine=$if_dmz,$if_trusted
if_its_mz=$if_dmz,$if_trusted
if_its_pi=$if_dmz,$if_trusted

m4_divert(-1)
###--------------------------------------------------------------------------
### radius-specific rules.

m4_divert(82)m4_dnl
## Externally visible services.
allowservices inbound tcp \
	dns iodine \
	ssh
allowservices inbound udp \
	dns iodine \
	tripe

## Provide DNS resolution to local untrusted hosts.
for p in tcp udp; do
  run iptables -A inbound -j ACCEPT \
	  -s 172.29.198.0/24 \
	  -p $p --destination-port $port_dns
done

## Provide syslog for evolution.
run iptables -A inbound -j ACCEPT \
	-s 172.29.198.2 \
	-p udp --destination-port $port_syslog

## Other interesting things.
dnsresolver inbound

## NAT for RFC1918 addresses.
for i in PREROUTING OUTPUT POSTROUTING; do
  run iptables -t nat -P $i ACCEPT 2>/dev/null || :
  run iptables -t nat -F $i 2>/dev/null || :
done
run iptables -t nat -F
run iptables -t nat -X

run iptables -t nat -N outbound
run iptables -t nat -A outbound -j RETURN ! -o $if_dmz
run iptables -t nat -A outbound -j RETURN ! -s 172.29.198.0/23
run iptables -t nat -A outbound -j RETURN -d 62.49.204.144/28
run iptables -t nat -A outbound -j RETURN -d 172.29.198.0/23
run iptables -t nat -A outbound -j SNAT --to-source 62.49.204.158
run iptables -t nat -A POSTROUTING -j outbound

m4_divert(-1)
###----- That's all, folks --------------------------------------------------