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Date: Fri, 4 Nov 2005 17:27:13 -0500 (EST)
From: Igor Pechtchanski <pechtcha AT cs DOT nyu DOT edu>
Reply-To: cygwin AT cygwin DOT com
To: Re Persina <r99990 AT gmail DOT com>
cc: cygwin AT cygwin DOT com
Subject: Re: Cygwin and ssh - password auth. problem
In-Reply-To: <3503d12f0511041402s4efb0432u353a45406df0c19d@mail.gmail.com>
Message-ID: <Pine.GSO.4.63.0511041724560.10504@slinky.cs.nyu.edu>
References: <3503d12f0511041357n4209ab1cm6cf5ebf2f398426d AT mail DOT gmail DOT com>  <3503d12f0511041402s4efb0432u353a45406df0c19d AT mail DOT gmail DOT com>
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On Fri, 4 Nov 2005, Re Persina wrote:

> Hello,
>  I have cygwin running on a windows 2000 server, which is also a PDC.
> I setup sshd in cygwin and I've been using it for some time to login
> as administrator, both using the password and using public-key auth,
> and it has been working great. I now need to have a regular user (a
> member of the Domain User group) login using ssh. I'll call this user
> "user1". I created the user in active directory, and synced cygwin's
> passwd file with "mkpasswd -d > /etc/passwd". However, this does not
> allow me to login over ssh as my new user, using the password I set.
>
>  I try to ssh to the server as the user and I enter the password when
> I am prompted by ssh, but it does not accept it; I get "Permission
> denied, please try again.". I checked the windows event log, and it
> says: "...sshd: PID:2588: Failed password for user1 from 10.0.0.2...".
> If I upload my public key to ~user1/.ssh/authorized_keys, I can login.
> I understand that is because ssh pub-key auth bypasses windows auth
> altogether. Unfortunately, I cannot use pub-key auth for this
> particular user.
>
>  The only way I've found to make password-auth work, is to add the
> user to the Administrators group. As soon as I do that, I can
> successfully ssh to the server and succesfully login with the "user1"
> user and its password. Then as soon as I remove the user from the
> Administrators group, I can no longer login over ssh. Actually I've
> found that adding this user to one of a variety of elevated-privledge
> groups will allow him to login. Making the user a member of any one
> of: "Server Operators", "Backup Operators", or "Domain Admin" will
> allow the user to login over ssh with his password. The problem is
> this user cannot have special permissions; he needs to be a standard
> user/ Domain User. I tried making him a member of the local Users
> group, but that had no effect.

Sounds like a permission problem.  Did you run "ssh-user-config" for that
user on the PDC?

>  From the research I've done so far, I haven't found any good reason
> why this shouldn't work. There should be a way to allow this user to
> login with his password without him needing elevated privledges, yes?
> Can someone please point me in the right direction?

You could try running sshd in verbose debug mode to see what messages you
get...  Also, a tool like "filemon" from SysInternals could help by
listing the files that sshd tries (and fails) to access...
HTH,
	Igor
-- 
				http://cs.nyu.edu/~pechtcha/
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ZZZzz /,`.-'`'    -.  ;-;;,_		igor AT watson DOT ibm DOT com
     |,4-  ) )-,_. ,\ (  `'-'		Igor Pechtchanski, Ph.D.
    '---''(_/--'  `-'\_) fL	a.k.a JaguaR-R-R-r-r-r-.-.-.  Meow!

If there's any real truth it's that the entire multidimensional infinity
of the Universe is almost certainly being run by a bunch of maniacs. /DA

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