Re: iptables as a protocol demultiplexer

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Le 16 mars 2013 à 19:18, Jan Engelhardt a écrit :
> On Saturday 2013-03-16 18:25, AZ 9901 wrote:
>> Le 12 mars 2013 à 19:09, AZ 9901 a écrit :
>>> 
>>> sslh (http://www.rutschle.net/tech/sslh.shtml) works as a protocol demultiplexer, it allows to separate SSH and HTTPS streams which arrive on the same port (443 for instance).
>>> I would like to do the same thing but with iptables only.
>>> Is it possible ?
> 
> No. As the name already says, it works at the IP/Network level,
> not with upper protocols.

Yes but I was thinking of something like that :
- use "string" module to catch the first packet of a SSH connection (looking for SSH- pattern, as sslh does in its probe.c source file)
- use conntrack to follow this detected SSH connection
- redirect this detected SSH connection from port 443 to port 22

Other non-rediected connection (HTTPS connections) would then simply go to Apache.

Any chance ?

Thank you !

Best regards,

Benjamin

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