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Date: Sat, 21 Mar 2009 11:10:04 +0100
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
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Subject: Re: [1.7] passwd: useless if used with a logged on domain user
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On Mar 20 18:43, Julio Emanuel wrote:
> Hi,
> 
> I've been tracing some problems related to the installation scripts of
> ssh (more info on another mail later), and the root cause for one of
> the problems is the passwd misbehaving.
> The test case is very simple. Log on with a domain user on a cygwin
> shell. My particular case, it's an local Administrator, but not Domain
> Admin (as 99% of users in a corporate network out there, I suppose).
> 
> ~ $ id
> uid=18606(security) gid=10513(Domain Users)
> groups=0(root),544(Administrators),545(Users),10513(Domain Users)
> 
> Now, just try to do pretty much anything with passwd:
> 
> ~ $ passwd -v
> passwd (cygwin) 1.5
> Password Utility
> Copyright 1999, 2000, 2001, 2002, 2003 Red Hat, Inc.
> Compiled on Mar 11 2009
> 
> ~ $ passwd
> passwd: unknown user security
> 
> ~ $ passwd SYSTEM
> passwd: unknown user security
> 
> ~ $ passwd Administrator
> passwd: unknown user security
> 
> Am I missing something here?
> How can I make it work with local users, when I'm logged on with a Domain user?

That doesn't look too well, but I can't reproduce the effect.  If you
have a look into the source of passwd

http://cygwin.com/cgi-bin/cvsweb.cgi/src/winsup/utils/passwd.c?rev=1.15&content-type=text/x-cvsweb-markup&cvsroot=src

you'll see a function GetPW (line 114ff) which calls a Cygwin internal
function to fetch the Windows username and the domain from the cygwin
passwd entry and then it calls

  NetUserGetInfo (server, name, 3, (void *) &ui);

(The server is fetched in main(), line 516ff. from the $LOGONSERVER
variable).  Apparently this function returns the error code
NERR_UserNotFound.  Your problem is to find out why it does that.

It's very simple to build passwd for debugging yourself.  Just fetch
the above source and build it like this:

  $ gcc -g passwd.c -o my_passwd -lnetapi32


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat

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