From 667f7507fbc3bd538faa844da449c29b3a49a725 Mon Sep 17 00:00:00 2001 From: julian Date: Mon, 22 Jun 2015 04:25:41 +0000 Subject: remove 16 rules and replace by 2 by using a table I've been doing this ever since there were tables coudl make more efficient by using "in recv" and "out xmit" instead of via but I'll leave that. MFC after: 1 week --- etc/rc.firewall | 36 ++++++++++++++---------------------- 1 file changed, 14 insertions(+), 22 deletions(-) (limited to 'etc') diff --git a/etc/rc.firewall b/etc/rc.firewall index ee578ef..0c4d220 100644 --- a/etc/rc.firewall +++ b/etc/rc.firewall @@ -266,6 +266,7 @@ case ${firewall_type} in # firewall_simple_oif_ipv6: Outside IPv6 network interface. # firewall_simple_onet_ipv6: Outside IPv6 network prefix. ############ + BAD_ADDR_TBL=13 # set these to your outside interface network oif="$firewall_simple_oif" @@ -290,19 +291,23 @@ case ${firewall_type} in fi fi + # define stuff we should never send out or receive in # 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} + ${fwcmd} table ${BAD_ADDR_TBL} flush + ${fwcmd} table ${BAD_ADDR_TBL} add 10.0.0.0/8 + ${fwcmd} table ${BAD_ADDR_TBL} add 172.16.0.0/12 + ${fwcmd} table ${BAD_ADDR_TBL} add 192.168.0.0/16 # 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} + ${fwcmd} table ${BAD_ADDR_TBL} add 0.0.0.0/8 + ${fwcmd} table ${BAD_ADDR_TBL} add 169.254.0.0/16 + ${fwcmd} table ${BAD_ADDR_TBL} add 192.0.2.0/24 + ${fwcmd} table ${BAD_ADDR_TBL} add 224.0.0.0/4 + ${fwcmd} table ${BAD_ADDR_TBL} add 240.0.0.0/4 + + ${fwcmd} add deny all from any to "table($BAD_ADDR_TBL)" via ${oif} # Network Address Translation. This rule is placed here deliberately # so that it does not interfere with the surrounding address-checking @@ -319,20 +324,7 @@ case ${firewall_type} in ;; esac - # 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 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} - + ${fwcmd} add deny all from "table($BAD_ADDR_TBL)" to any via ${oif} if [ -n "$inet6" ]; then # Stop unique local unicast address on the outside interface ${fwcmd} add deny all from fc00::/7 to any via ${oif6} -- cgit v1.1