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Re: Initial patch to implement partial auth with SSH2

Hi Corinna...

I was thinking...for the CygWin environment (on WinNT and Win2k) we could 
avoid the problem of where to place a new call to check_nt_auth and 
auth_password by requiring that if the ssh and sshd user-ids are different, 
that password authentication is required (which was the reason I was 
interested in this in the first place). I can do that for now by using

Authorder2 publickey:password

and commenting out the check in userauth_publickey.



>From: Corinna Vinschen <>
>Subject: Re: Initial patch to implement partial auth with SSH2
>Date: Fri, 20 Apr 2001 13:13:54 +0200
>On Fri, Apr 20, 2001 at 01:29:42AM -0700, Karl M wrote:
> > Hi All...
> >
> > I've been experimenting with the partial authorization patch for
> > OpenSSH-2.5.2. I'm using CygWin on a Windows 2000 (SP1) box.
> >
> > I noticed a bug in the patch that shows up for CygWin users. The problem 
> > that publickey authentication only works if sshd is running with the 
> > user-id as the ssh client. When I run sshd as a service with a user-id 
> > LocalSystem publickey authentication fails.
> >
> > This is because the check_nt_auth call in userauth-pubkey fails if the 
> > user-id is different from the sshd user-id.
> >
> > It looks to me like userauth_pubkey needs to "suspend disbelief" (and 
> > call check_nt_auth and auth_password) for partial authentication, in the
> > hope that a password may come later. Then somewhere check_nt_auth
> > auth_password need to be called to make sure that we don't forget to set 
> > sshd user-id to the ssh user-id.
>Since the original partial authorization patch isn't applied yet,
>you're somwhat on your own. Why don't you simply override the
>check in `check_ntsec' for now?
>Corinna Vinschen
>Cygwin Developer
>Red Hat, Inc.
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