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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <0EE8C7F7-9929-41E0-ADE2-DB2BC5483C88@gmail.com>
Date: Mon, 21 Mar 2011 13:39:52 -0700
From: bk <chort0@...il.com>
To: 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 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.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/