Date: Tue, 25 Jan 2000 14:32:40 -0800 (PST) From: "Rodney W. Grimes" <freebsd@gndrsh.dnsmgr.net> To: Tony.Voet@rug.ac.be (Tony Voet) Cc: freebsd-security@FreeBSD.org Subject: Re: more complete ipfw rules Message-ID: <200001252232.OAA71995@gndrsh.dnsmgr.net> In-Reply-To: <388D7516.C4EB676@rug.ac.be> from Tony Voet at "Jan 25, 2000 11:04:06 am"
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> The Mad Scientist wrote:
> >
> > I have this commented-out line in my ruleset.
> > #$fwcmd add 550 deny log ip from 169.254.0.0/16 to any in via ${out_if}
> > Don't quite remember what it's for. I hope it's not another wasted class
> > B. Can anyone enlighten me?
>
> This IETF draft answers your question:
>
> http://www.ietf.org/internet-drafts/draft-manning-dsua-01.txt
And that draft produces the following patch for review:
Index: rc.firewall
===================================================================
RCS file: /home/ncvs/src/etc/rc.firewall,v
retrieving revision 1.28
diff -u -r1.28 rc.firewall
--- rc.firewall 1999/12/04 01:27:51 1.28
+++ rc.firewall 2000/01/25 22:30:08
@@ -110,9 +110,9 @@
############
# set these to your network and netmask and ip
- net="192.168.4.0"
+ net="192.0.2.0"
mask="255.255.255.0"
- ip="192.168.4.17"
+ ip="192.0.2.1"
# Allow any traffic to or from my own net.
${fwcmd} add pass all from ${ip} to ${net}:${mask}
@@ -155,27 +155,39 @@
# set these to your outside interface network and netmask and ip
oif="ed0"
- onet="192.168.4.0"
- omask="255.255.255.0"
- oip="192.168.4.17"
+ onet="192.0.2.0"
+ omask="255.255.255.240"
+ oip="192.0.2.1"
# set these to your inside interface network and netmask and ip
iif="ed1"
- inet="192.168.3.0"
- imask="255.255.255.0"
- iip="192.168.3.17"
+ inet="192.0.2.16"
+ imask="255.255.255.240"
+ iip="192.0.2.17"
# Stop spoofing
${fwcmd} add deny all from ${inet}:${imask} to any in via ${oif}
${fwcmd} add deny all from ${onet}:${omask} to any in via ${iif}
# Stop RFC1918 nets on the outside interface
- ${fwcmd} add deny all from 192.168.0.0:255.255.0.0 to any via ${oif}
- ${fwcmd} add deny all from any to 192.168.0.0:255.255.0.0 via ${oif}
- ${fwcmd} add deny all from 172.16.0.0:255.240.0.0 to any via ${oif}
- ${fwcmd} add deny all from any to 172.16.0.0:255.240.0.0 via ${oif}
- ${fwcmd} add deny all from 10.0.0.0:255.0.0.0 to any via ${oif}
- ${fwcmd} add deny all from any to 10.0.0.0:255.0.0.0 via ${oif}
+ ${fwcmd} add deny all from 10.0.0.0/8 to any via ${oif}
+ ${fwcmd} add deny all from any to 10.0.0.0/8 via ${oif}
+ ${fwcmd} add deny all from 172.16.0.0/12 to any via ${oif}
+ ${fwcmd} add deny all from any to 172.16.0.0/12 via ${oif}
+ ${fwcmd} add deny all from 192.168.0.0/16 to any via ${oif}
+ ${fwcmd} add deny all from any to 192.168.0.0/16 via ${oif}
+
+ # Stop draft-manning-dsua-01.txt nets on the outside interface
+ ${fwcmd} add deny all from 0.0.0.0/8 to any via ${oif}
+ ${fwcmd} add deny all from any to 0.0.0.0/8 via ${oif}
+ ${fwcmd} add deny all from 169.254.0.0/16 to any via ${oif}
+ ${fwcmd} add deny all from any to 169.254.0.0/16 via ${oif}
+ ${fwcmd} add deny all from 192.0.2.0/24 to any via ${oif}
+ ${fwcmd} add deny all from any to 192.0.2.0/24 via ${oif}
+ ${fwcmd} add deny all from 224.0.0.0/4 to any via ${oif}
+ ${fwcmd} add deny all from any to 224.0.0.0/4 via ${oif}
+ ${fwcmd} add deny all from 240.0.0.0/4 to any via ${oif}
+ ${fwcmd} add deny all from any to 240.0.0.0/4 via ${oif}
# Allow TCP through if setup succeeded
${fwcmd} add pass tcp from any to any established
--
Rod Grimes - KD7CAX @ CN85sl - (RWG25) rgrimes@gndrsh.dnsmgr.net
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