[ale] Documentation of SSH exchange (including math)

[Michael H. Warfield]

On Sun, 2012-09-02 at 18:21 -0400, Derek Atkins wrote:
> Have you tried RFC4251,52,53?

Crap, you beat me to it.

Yeah, ssh has been standardized and documented in IETF RFC standards
docs for quite some time.  Tatu may have created the original but those
RFC's are authoritative for the standard.  You could also refer to the
OpenSSH code and internal docs.

> -derek

> Sent from my HTC smartphone

Regards,
Mike

> ----- Reply message -----
> From: "Alex Carver" <agcarver+ale at acarver.net>
> To: "Atlanta Linux Enthusiasts" <ale at ale.org>
> Subject: [ale] Documentation of SSH exchange (including math)
> Date: Sun, Sep 2, 2012 6:10 PM
> 
> 
> Hi all,
> 
> Does anyone happen to know of a site or other document that describes in 
> detail (including the basic math) of the SSH2 PK authentication process? 
>   All my searches describe the process of enabling PK authentication in 
> the daemon and generating the keys but I'm trying to find something that 
> describes the actual exchange process that identifies a user including 
> the math that is used during the exchange (i.e. any intermediate 
> messages being encrypted by which key, etc.)
> 
> I know there is more to the exchange than just the user's private and 
> public keys to reduce the possibility of MITM and replay attacks.
> 
> If I have to I will just dig through the openssh source but I was hoping 
> for something a bit more condensed.  I've got a crazy idea for a 
> home-built project (once I scrape together the dollars) and I want to 
> use PK authentication as part of it.
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-- 
Michael H. Warfield (AI4NB) | (770) 985-6132 |  mhw at WittsEnd.com
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