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new more flexible firewall

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git-svn-id: svn://svn.openwrt.org/openwrt/trunk@705 3c298f89-4303-0410-b956-a3cf2f4a3e73
This commit is contained in:
mbm 2005-04-23 18:58:32 +00:00
parent b9ebcec500
commit 8323c2ebd7
1 changed files with 76 additions and 25 deletions
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99
openwrt/target/default/target_skeleton/etc/init.d/S45firewall
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@ -1,36 +1,87 @@
#!/bin/sh
. /etc/functions.sh
export WAN=$(nvram get wan_ifname)
export IPT=/usr/sbin/iptables
export LAN=$(nvram get lan_ifname)
## CLEAR TABLES
for T in filter nat mangle; do
$IPT -t $T -F
$IPT -t $T -X
iptables -t $T -F
iptables -t $T -X
done
# initial rules
$IPT -t filter -A INPUT -m state --state INVALID -j DROP
$IPT -t filter -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
$IPT -t filter -A FORWARD -m state --state INVALID -j DROP
$IPT -t filter -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
iptables -N input_rule
iptables -N output_rule
iptables -N forwarding_rule
if [ -d /etc/firewall.d ]; then
for fw in /etc/firewall.d/??*; do
[ -x $fw ] && $fw
done
fi
iptables -t nat -N prerouting_rule
iptables -t nat -N postrouting_rule
# defaults
### Port forwarding
# iptables -t nat -A prerouting_rule -p tcp --dport 22 -j DNAT --to 192.168.1.2
# iptables -A forwarding_rule -p tcp --dport 22 -d 192.168.1.2 -j ACCEPT
$IPT -t filter -A INPUT -p icmp -j ACCEPT
$IPT -t filter -A INPUT -p 47 -j ACCEPT # allow GRE
$IPT -t filter -A INPUT -i $WAN -p tcp --syn --tcp-option \! 2 -j DROP
$IPT -t filter -A INPUT -i $WAN -p tcp -j REJECT --reject-with tcp-reset
$IPT -t filter -A INPUT -i $WAN -j REJECT --reject-with icmp-port-unreachable
### INPUT
### (connections with the router as destination)
$IPT -t filter -A FORWARD -i br0 -o br0 -j ACCEPT
$IPT -t filter -A FORWARD -i $WAN -m state --state NEW -j DROP
$IPT -t filter -A FORWARD -o $WAN -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
# 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
$IPT -t nat -A POSTROUTING -o $WAN -j MASQUERADE
# allow
iptables -A INPUT -i \! $WAN -j ACCEPT # allow from lan/wifi interfaces
iptables -A INPUT -p icmp -j ACCEPT # allow ICMP
iptables -A INPUT -p 47 -j ACCEPT # allow GRE
#
# insert accept rule or to jump to new accept-check table here
#
iptables -A INPUT -j input_rule
# reject (what to do with anything not allowed earlier)
iptables -A INPUT -p tcp --syn --tcp-option \! 2 -j DROP
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
# allow
iptables -A OUTPUT -j ACCEPT #allow everything out
#
# insert accept rule or to jump to new accept-check table here
#
iptables -A OUTPUT -j output_rule
# 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 -m state --state RELATED,ESTABLISHED -j ACCEPT
iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
# allow
iptables -A FORWARD -i br0 -o br0 -j ACCEPT
iptables -A FORWARD -i $LAN -o $WAN -j ACCEPT
#
# insert accept rule or to jump to new accept-check table here
#
iptables -A FORWARD -j forwarding_rule
# reject (what to do with anything not allowed earlier)
# uses the default -P DROP
### MASQ
iptables -t nat -A PREROUTING -j prerouting_rule
iptables -t nat -A POSTROUTING -j postrouting_rule
iptables -t nat -A POSTROUTING -o $WAN -j MASQUERADE