So apparently this has become illegal, and neither google or me playing
around has figured out how to update it. Input is most welcome.
+ iptables -t nat -A prerouting_rule -i br-lan -p tcp --dport 80 -j
REDIRECT --to-port 3128
+ iptables -t nat -A prerouting_rule -p tcp --dport 2020 -m state
--state NEW -m recent --name ATTACKER_SSH --rsource --update --seconds
120 --hitcount 5 -j DROP
iptables v1.4.3.2:
The "nat" table is not intended for filtering, the use of DROP is
therefore inhibited.
Try `iptables -h' or 'iptables --help' for more information.
This is a openwrt router running the old firewall (not supported or I
would have asked on their mailing list) I will attach it encase anyone
wants to give it a quick peek and finds anything terribly wrong/outdated
(but it does currently work fine).
Thank you for your time.
#!/bin/sh /etc/rc.common
# Copyright (C) 2006 OpenWrt.org
## Please make changes in /etc/firewall.user
START=45
start() {
include /lib/network
scan_interfaces
config_get WAN wan ifname
config_get WANDEV wan device
config_get LAN lan ifname
config_get_bool NAT_LAN lan nat 1
if [ $NAT_LAN -ne 0 ]
then
config_get LAN_MASK lan netmask
config_get LAN_IP lan ipaddr
LAN_NET=$(/bin/ipcalc.sh $LAN_IP $LAN_MASK | grep NETWORK | cut -d= -f2)
fi
## CLEAR TABLES
for T in filter nat; do
iptables -t $T -F
iptables -t $T -X
done
iptables -N input_rule
iptables -N input_wan
iptables -N output_rule
iptables -N forwarding_rule
iptables -N forwarding_wan
iptables -t nat -N NEW
iptables -t nat -N prerouting_rule
iptables -t nat -N prerouting_wan
iptables -t nat -N postrouting_rule
iptables -N LAN_ACCEPT
[ -z "$WAN" ] || iptables -A LAN_ACCEPT -i "$WAN" -j RETURN
[ -z "$WANDEV" -o "$WANDEV" = "$WAN" ] || iptables -A LAN_ACCEPT -i "$WANDEV" -j RETURN
iptables -A LAN_ACCEPT -j ACCEPT
### INPUT
### (connections with the router as destination)
# base case
iptables -P INPUT DROP
iptables -A INPUT -m state --state INVALID -j DROP
iptables -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
iptables -A INPUT -p tcp --tcp-flags SYN SYN --tcp-option \! 2 -j DROP
#
# insert accept rule or to jump to new accept-check table here
#
iptables -A INPUT -j input_rule
[ -z "$WAN" ] || iptables -A INPUT -i $WAN -j input_wan
# allow
iptables -A INPUT -j LAN_ACCEPT # allow from lan/wifi interfaces
iptables -A INPUT -p icmp -j ACCEPT # allow ICMP
iptables -A INPUT -p gre -j ACCEPT # allow GRE
# reject (what to do with anything not allowed earlier)
iptables -A INPUT -p tcp -j REJECT --reject-with tcp-reset
iptables -A INPUT -j REJECT --reject-with icmp-port-unreachable
### OUTPUT
### (connections with the router as source)
# base case
iptables -P OUTPUT DROP
iptables -A OUTPUT -m state --state INVALID -j DROP
iptables -A OUTPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
#
# insert accept rule or to jump to new accept-check table here
#
iptables -A OUTPUT -j output_rule
# allow
iptables -A OUTPUT -j ACCEPT #allow everything out
# reject (what to do with anything not allowed earlier)
iptables -A OUTPUT -p tcp -j REJECT --reject-with tcp-reset
iptables -A OUTPUT -j REJECT --reject-with icmp-port-unreachable
### FORWARDING
### (connections routed through the router)
# base case
iptables -P FORWARD DROP
iptables -A FORWARD -m state --state INVALID -j DROP
iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
iptables -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
#
# insert accept rule or to jump to new accept-check table here
#
iptables -A FORWARD -j forwarding_rule
[ -z "$WAN" ] || iptables -A FORWARD -i $WAN -j forwarding_wan
# allow
iptables -A FORWARD -i $LAN -o $LAN -j ACCEPT
[ -z "$WAN" ] || iptables -A FORWARD -i $LAN -o $WAN -j ACCEPT
# reject (what to do with anything not allowed earlier)
# uses the default -P DROP
### MASQ
iptables -t nat -A PREROUTING -m state --state NEW -p tcp -j NEW
iptables -t nat -A PREROUTING -j prerouting_rule
[ -z "$WAN" ] || iptables -t nat -A PREROUTING -i "$WAN" -j prerouting_wan
iptables -t nat -A POSTROUTING -j postrouting_rule
### Only LAN, unless told not to
if [ $NAT_LAN -ne 0 ]
then
[ -z "$WAN" ] || iptables -t nat -A POSTROUTING --src $LAN_NET/$LAN_MASK -o $WAN -j MASQUERADE
fi
iptables -t nat -A NEW -m limit --limit 50 --limit-burst 100 -j RETURN && \
iptables -t nat -A NEW -j DROP
## USER RULES
[ -f /etc/firewall.user ] && . /etc/firewall.user
[ -n "$WAN" -a -e /etc/firewall.config ] && {
export WAN
awk -f /usr/lib/common.awk -f /usr/lib/firewall.awk /etc/firewall.config | ash
}
}
stop() {
iptables -P INPUT ACCEPT
iptables -P OUTPUT ACCEPT
iptables -P FORWARD ACCEPT
iptables -F
iptables -X
iptables -t nat -P PREROUTING ACCEPT
iptables -t nat -P POSTROUTING ACCEPT
iptables -t nat -P OUTPUT ACCEPT
iptables -t nat -F
iptables -t nat -X
}#!/bin/sh
# Copyright (C) 2006 OpenWrt.org
# $Id: firewall.user 69 2009-04-29 17:58:40Z weedy $
WAN="$(uci -P /var/state get network.wan.ifname)"
LAN="$(uci -P /var/state get network.lan.ifname)"
WANIP=$(ifconfig $WAN | grep 'inet addr' | awk '{print $2}' | cut -d':' -f 2)
LANIP=$(ifconfig $LAN | grep 'inet addr' | awk '{print $2}' | cut -d':' -f 2)
iptables -A input_rule -p esp -j ACCEPT # allow IPSEC
iptables -A input_rule -p 17 --dport 500 -j ACCEPT # allow ISAKMP
iptables -A input_rule -p udp --dport 4500 -j ACCEPT # allow NAT-T
iptables -A forwarding_rule -m policy --dir in --pol ipsec --mode tunnel -j ACCEPT
iptables -A forwarding_rule -m policy --dir out --pol ipsec --mode tunnel -j ACCEPT
iptables -t nat -A postrouting_rule -d 10.0.0.0/8 -j ACCEPT
iptables -t nat -A postrouting_rule -d 172.16.0.0/12 -j ACCEPT
iptables -t nat -A postrouting_rule -d 192.168.0.0/16 -j ACCEPT
#iptables -A output_rule -p 47 -j ACCEPT
#iptables -A input_rule -p 47 -j ACCEPT
#iptables -t nat -A prerouting_rule -p tcp --dport 8888 -j DNAT --to ${LANIP%.*}.251:80
#iptables -A forwarding_rule -p tcp --dport 80 -d $WANIP -j ACCEPT
#iptables -t nat -A prerouting_rule -p tcp --dport 2222 -j DNAT --to $WANIP:22
#iptables -A forwarding_rule -p tcp --dport 22 -d $WANIP -j ACCEPT
# iptables -t nat -A prerouting_rule -j DNAT --to ${LANIP%.*}.170
# iptables -A forwarding_rule -d ${LANIP%.*}.170 -j ACCEPT
iptables -t nat -A prerouting_rule -i $LAN -p tcp --dport 80 -j REDIRECT --to-port 3128
iptables -t nat -A prerouting_rule -p tcp --dport 2020 -m state --state NEW \
-m recent --name ATTACKER_SSH --rsource --update --seconds 120 --hitcount 5 -j DROP
iptables -t nat -A prerouting_rule -p tcp --dport 2020 -m state --state NEW \
-m recent --name ATTACKER_SSH --rsource --set
iptables -t nat -A prerouting_rule -p tcp --dport 2020 -j ACCEPT
iptables -A input_rule -p tcp --dport 2020 -j ACCEPT
#iptables -t nat -A prerouting_rule -i $WAN -p tcp --dport 81 -j DNAT --to-destination ${LANIP%.*}.251
#iptables -A forwarding_rule -i $WAN -p tcp --dport 81 -d ${LANIP%.*}.251 -j ACCEPT
iptables -t nat -A prerouting_rule -i $WAN -p tcp --dport 2080 -j DNAT --to-destination ${LANIP%.*}.250
iptables -A forwarding_rule -i $WAN -p tcp --dport 2080 -d ${LANIP%.*}.250 -j ACCEPT
# iptables -A forwarding_rule -p TCP -i $LAN -s ${LANIP%.*}.5 -j ACCEPT
# iptables -A forwarding_rule -p UDP -i $LAN -s ${LANIP%.*}.5 -j ACCEPT
iptables -A forwarding_rule -p TCP -i $LAN -s ${LANIP%.*}.247 -m multiport --dport 21,80,3128,2000 -j ACCEPT
iptables -A forwarding_rule -p UDP -i $LAN -s ${LANIP%.*}.200 --dport 9999 -j ACCEPT
# iptables -A forwarding_rule -p TCP -i $LAN -m iprange --src-range ${LANIP%.*}.11-${LANIP%.*}.254 -j ACCEPT
iptables -A forwarding_rule -p TCP -i $LAN -m iprange --src-range ${LANIP%.*}.2-${LANIP%.*}.10 -m multiport --dport 21,22,53,80,443,1433,3128,3579,3580,8000,8765,9865 -j ACCEPT
iptables -A forwarding_rule -p UDP -i $LAN -m iprange --src-range ${LANIP%.*}.2-${LANIP%.*}.10 -m multiport --dport 53 -j ACCEPT
### Blocking IP's so most popular instant messengers programs will not work
if [ -f /etc/blockips.txt ]; then
while read BLOCK_IPS JUNK; do # may not need JUNK, but it doesn't hurt
iptables -I forwarding_rule -d $BLOCK_IPS -i $LAN -m iprange --src-range ${LANIP%.*}.2-${LANIP%.*}.10 -j DROP
done < "/etc/blockips.txt"
fi
if [ -f /etc/mac.txt ]; then
while read MAC JUNK; do # may not need JUNK, but it doesn't hurt
iptables -A forwarding_rule -p TCP -i $LAN -m mac --mac-source $MAC -j ACCEPT
iptables -A forwarding_rule -p UDP -i $LAN -m mac --mac-source $MAC -j ACCEPT
done < "/etc/mac.txt"
fi
### Drop all outbound ports by default
iptables -A forwarding_rule -j DROP# Generated by iptables-save v1.4.3.2 on Sat May 2 03:38:55 2009
*nat
:PREROUTING ACCEPT [4:771]
:POSTROUTING ACCEPT [38:2729]
:OUTPUT ACCEPT [41:2981]
:NEW - [0:0]
:postrouting_rule - [0:0]
:prerouting_rule - [0:0]
:prerouting_wan - [0:0]
-A PREROUTING -p tcp -m state --state NEW -j NEW
-A PREROUTING -j prerouting_rule
-A PREROUTING -i eth0.1 -j prerouting_wan
-A POSTROUTING -j postrouting_rule
-A POSTROUTING -s 172.17.17.0/24 -o eth0.1 -j MASQUERADE
-A NEW -m limit --limit 50/sec --limit-burst 100 -j RETURN
-A postrouting_rule -d 10.0.0.0/8 -j ACCEPT
-A postrouting_rule -d 172.16.0.0/12 -j ACCEPT
-A postrouting_rule -d 192.168.0.0/16 -j ACCEPT
-A prerouting_rule -i br-lan -p tcp -m tcp --dport 80 -j REDIRECT --to-ports 3128
-A prerouting_rule -p tcp -m tcp --dport 2020 -m state --state NEW -m recent --set --name ATTACKER_SSH --rsource
-A prerouting_rule -p tcp -m tcp --dport 2020 -j ACCEPT
-A prerouting_rule -i eth0.1 -p tcp -m tcp --dport 2080 -j DNAT --to-destination 172.17.17.250
COMMIT
# Completed on Sat May 2 03:38:55 2009
# Generated by iptables-save v1.4.3.2 on Sat May 2 03:38:55 2009
*raw
:PREROUTING ACCEPT [370:31230]
:OUTPUT ACCEPT [326:44408]
COMMIT
# Completed on Sat May 2 03:38:55 2009
# Generated by iptables-save v1.4.3.2 on Sat May 2 03:38:55 2009
*mangle
:PREROUTING ACCEPT [376:31470]
:INPUT ACCEPT [369:30660]
:FORWARD ACCEPT [7:810]
:OUTPUT ACCEPT [332:45080]
:POSTROUTING ACCEPT [335:45662]
COMMIT
# Completed on Sat May 2 03:38:55 2009
# Generated by iptables-save v1.4.3.2 on Sat May 2 03:38:55 2009
*filter
:INPUT DROP [0:0]
:FORWARD DROP [0:0]
:OUTPUT DROP [0:0]
:LAN_ACCEPT - [0:0]
:forwarding_rule - [0:0]
:forwarding_wan - [0:0]
:input_rule - [0:0]
:input_wan - [0:0]
:output_rule - [0:0]
-A INPUT -m state --state INVALID -j DROP
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A INPUT -p tcp -m tcp ! --tcp-option 2 --tcp-flags SYN SYN -j DROP
-A INPUT -j input_rule
-A INPUT -i eth0.1 -j input_wan
-A INPUT -j LAN_ACCEPT
-A INPUT -p icmp -j ACCEPT
-A INPUT -p gre -j ACCEPT
-A INPUT -p tcp -j REJECT --reject-with tcp-reset
-A INPUT -j REJECT --reject-with icmp-port-unreachable
-A FORWARD -m state --state INVALID -j DROP
-A FORWARD -p tcp -m tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
-A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
-A FORWARD -j forwarding_rule
-A FORWARD -i eth0.1 -j forwarding_wan
-A FORWARD -i br-lan -o br-lan -j ACCEPT
-A FORWARD -i br-lan -o eth0.1 -j ACCEPT
-A OUTPUT -m state --state INVALID -j DROP
-A OUTPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A OUTPUT -j output_rule
-A OUTPUT -j ACCEPT
-A OUTPUT -p tcp -j REJECT --reject-with tcp-reset
-A OUTPUT -j REJECT --reject-with icmp-port-unreachable
-A LAN_ACCEPT -i eth0.1 -j RETURN
-A LAN_ACCEPT -j ACCEPT
-A forwarding_rule -d 63.135.80.0/20 -i br-lan -m iprange --src-range 172.17.17.2-172.17.17.10 -j DROP
-A forwarding_rule -d 1.0.0.0/8 -i br-lan -m iprange --src-range 172.17.17.2-172.17.17.10 -j DROP
-A forwarding_rule -d 205.188.0.0/16 -i br-lan -m iprange --src-range 172.17.17.2-172.17.17.10 -j DROP
-A forwarding_rule -d 74.125.0.0/16 -i br-lan -m iprange --src-range 172.17.17.2-172.17.17.10 -j DROP
-A forwarding_rule -d 69.147.64.0/18 -i br-lan -m iprange --src-range 172.17.17.2-172.17.17.10 -j DROP
-A forwarding_rule -d 207.68.192.0/20 -i br-lan -m iprange --src-range 172.17.17.2-172.17.17.10 -j DROP
-A forwarding_rule -d 207.68.128.0/18 -i br-lan -m iprange --src-range 172.17.17.2-172.17.17.10 -j DROP
-A forwarding_rule -d 205.188.0.0/16 -i br-lan -m iprange --src-range 172.17.17.2-172.17.17.10 -j DROP
-A forwarding_rule -d 64.12.0.0/16 -i br-lan -m iprange --src-range 172.17.17.2-172.17.17.10 -j DROP
-A forwarding_rule -m policy --dir in --pol ipsec --mode tunnel -j ACCEPT
-A forwarding_rule -m policy --dir out --pol ipsec --mode tunnel -j ACCEPT
-A forwarding_rule -d 172.17.17.250/32 -i eth0.1 -p tcp -m tcp --dport 2080 -j ACCEPT
-A forwarding_rule -s 172.17.17.247/32 -i br-lan -p tcp -m multiport --dports 21,80,3128,2000 -j ACCEPT
-A forwarding_rule -s 172.17.17.200/32 -i br-lan -p udp -m udp --dport 9999 -j ACCEPT
-A forwarding_rule -i br-lan -p tcp -m iprange --src-range 172.17.17.2-172.17.17.10 -m multiport --dports 21,22,53,80,443,1433,3128,3579,3580,8000,8765,9865 -j ACCEPT
-A forwarding_rule -i br-lan -p udp -m iprange --src-range 172.17.17.2-172.17.17.10 -m multiport --dports 53 -j ACCEPT
-A forwarding_rule -i br-lan -p tcp -m mac --mac-source 08:FA:KE:FA:KE:28 -j ACCEPT
-A forwarding_rule -i br-lan -p udp -m mac --mac-source 08:FA:KE:FA:KE:28 -j ACCEPT
-A forwarding_rule -j DROP
-A input_rule -p esp -j ACCEPT
-A input_rule -p udp -m udp --dport 500 -j ACCEPT
-A input_rule -p udp -m udp --dport 4500 -j ACCEPT
-A input_rule -p tcp -m tcp --dport 2020 -j ACCEPT
COMMIT
# Completed on Sat May 2 03:38:55 2009
