ssh expect on Cygwin

[Max Bowsher]

Christopher Cobb wrote:
> ----- Original Message -----
> From: "D N" <niz87@hotmail.com>
> To: ccobb@email.com, cygwin@cygwin.com
> Subject: Re: ssh expect on Cygwin
> Date: Sun, 31 Oct 2004 17:55:13 +0000
>
>>
>>> Since passwordless authentication is broken on many cygwin systems I 
>>> use, I
>>> end
>>> up using the following expect script (more frequently that I would 
>>> like).
>>
>> Are you sure you cant just fix the passwordless login?
>>
>> I have cyg on 5 different systems - works like a charm! I use keychain to
>> manage the keys.
>
> I have probably a dozen servers which have ssh on it.  Although I have
> passwordless authentication working on many of them, I cannot get it 
> working
> on one of my main servers.
>
> I would love to get this working.  In fact, I am setting up SVN over ssh 
> and
> I would really love to get rid of the passwords.  But there are some 
> systems
> where I can just not get passwordless authentication over ssh working.
>
> This particular system is in use and I cannot, for example, arbitrarily
> reboot it.  But short of that, I am willing to provide any troubleshooting
> assistence to anyone who thinks they can get to the bottom of this.
>
> Interestingly enough, between my system and this server, I can get it 
> working
> in one direction (from server to my system), but not the other (from my
> system to server -- which is the way I really need it).  Go figure.

The debugging technique with which I have had the most success with in this 
kind of circumstances is as follows:

Run another instance of sshd on a different port, with full debugging 
enabled to standard error:

$ sshd -Dddde -p 22222

You may well have to fiddle with permissions of the host keys and config 
files to get this running.

Now, try a pubkey login to this alternate sshd. Somewhere in the (copious) 
debug output, there is usually a clue to why the authentication is failing.

NB: In debug mode, sshd will terminate after 1 connection attempt. You will 
have to restart the alternate sshd each time you want to run another test.

Max.


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