full-disclosure - Re: Gmail and China's GFW

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Message-Id: <753AC9F2-1292-43AA-B452-20DE0F91A9A5@gmail.com>
Date: Mon, 21 Mar 2011 15:19:10 -0700
From: bk <chort0@...il.com>
To: Cal Leeming <cal@...whisper.co.uk>,
	Alien Chatter <feedalienscoffee@...il.com>,
	Full Disclosure <full-disclosure@...ts.grok.org.uk>
Subject: Re: Gmail and China's GFW


On Mar 21, 2011, at 1:43 PM, Cal Leeming wrote:

> 
> 
> On Mon, Mar 21, 2011 at 8:39 PM, bk <chort0@...il.com> wrote:
> 
> On Mar 21, 2011, at 10:52 AM, Alien Chatter wrote:
> 
> > $ sudo iptables -I INPUT -m string --algo bm --hex-string
> > '|476f6f676c6520496e63311830160603550403140f6d61696c2e676f6f676c652e636f6d30819f30|'
> > -j DROP
> >
> > Try it, you will get a connection timeout:
> >
> > $ curl --connect-timeout 60 https://mail.google.com/
> > curl: (28) SSL connection timeout
> >
> > The same applies for Twitter, Facebook... Much more efficient than
> > DNS/IP blocking!
> >
> 
> Because searching for a bytestring in payload generates so much less load than just overriding a DNS result at the recursive server (that users are forced to issue queries to) or a simply drop SYNs based on IP header value that routers/firewalls are optimized for...
> 
> I think you forgot your coffee this morning.  It's not just for aliens you know.
> 
> --
> chort
> 
> _______________________________________________
> Full-Disclosure - We believe in it.
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> 
> I think what he meant by efficient, was that if their sites ever get re-numbered or more end nodes are added (which may or may not be that often), then this would still catch the connections.
> 
> Imho, I think it'd be better to just have a script checking for it, but nether the less, it's a cute approach (albeit, probably not usable in a production environment).

It's "efficient" in that humans get to be lazy.  It's not efficient as far as hardware resource utilization.

--
chort



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