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add firewall script change from whiterussian to head

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git-svn-id: svn://svn.openwrt.org/openwrt/trunk/openwrt@1305 3c298f89-4303-0410-b956-a3cf2f4a3e73
This commit is contained in:
nbd 2005-07-01 15:19:39 +00:00
parent 196faec139
commit c9347df0fd
2 changed files with 43 additions and 10 deletions
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27
target/default/target_skeleton/etc/firewall.user Executable file
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@ -0,0 +1,27 @@
#!/bin/sh
. /etc/functions.sh
WAN=$(nvram get wan_ifname)
LAN=$(nvram get lan_ifname)
iptables -F input_rule
iptables -F output_rule
iptables -F forwarding_rule
iptables -F prerouting_rule
iptables -F postrouting_rule
### BIG FAT DISCLAIMER
### The "-i $WAN" literally means packets that came in over the $WAN interface;
### this WILL NOT MATCH packets sent from the LAN to the WAN address.
### Allow SSH from WAN
# iptables -t nat -A prerouting_rule -i $WAN -p tcp --dport 22 -j ACCEPT
# iptables -A input_rule -i $WAN -p tcp --dport 22 -j ACCEPT
### Port forwarding
# iptables -t nat -A prerouting_rule -i $WAN -p tcp --dport 22 -j DNAT --to 192.168.1.2
# iptables -A forwarding_rule -i $WAN -p tcp --dport 22 -d 192.168.1.2 -j ACCEPT
### DMZ (should be placed after port forwarding / accept rules)
# iptables -t nat -A prerouting_rule -i $WAN -j DNAT --to 192.168.1.2
# iptables -A forwarding_rule -i $WAN -d 192.168.1.2 -j ACCEPT

26
target/default/target_skeleton/etc/init.d/S45firewall
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@ -1,4 +1,7 @@
#!/bin/sh
## Please make changes in /etc/firewall.user
. /etc/functions.sh
WAN=$(nvram get wan_ifname)
LAN=$(nvram get lan_ifname)
@ -25,15 +28,16 @@ iptables -t nat -N postrouting_rule
iptables -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
iptables -A INPUT -p tcp --syn --tcp-option \! 2 -j DROP
# 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 gre -j ACCEPT # allow GRE
#
# insert accept rule or to jump to new accept-check table here
#
iptables -A INPUT -j input_rule
# 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 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
@ -46,13 +50,14 @@ iptables -t nat -N postrouting_rule
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
# 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
@ -66,14 +71,15 @@ iptables -t nat -N postrouting_rule
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
# 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
# allow
iptables -A FORWARD -i br0 -o br0 -j ACCEPT
iptables -A FORWARD -i $LAN -o $WAN -j ACCEPT
# reject (what to do with anything not allowed earlier)
# uses the default -P DROP
@ -83,4 +89,4 @@ iptables -t nat -N postrouting_rule
iptables -t nat -A POSTROUTING -o $WAN -j MASQUERADE
## USER RULES
. /etc/firewall.user
[ -f /etc/firewall.user ] && . /etc/firewall.user