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

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Date: Mon, 21 Mar 2011 20:43:42 +0000
From: Cal Leeming <cal@...whisper.co.uk>
To: bk <chort0@...il.com>
Cc: Full Disclosure <full-disclosure@...ts.grok.org.uk>
Subject: Re: Gmail and China's GFW

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).

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
>
> _______________________________________________
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