Manipulating user privileges (was Re: SSHD, Cygwin and Windows 2003)

Corinna Vinschen corinna-cygwin@cygwin.com
Tue Sep 16 10:26:00 GMT 2003


On Mon, Sep 15, 2003 at 03:29:48PM -0400, Mark J de Jong wrote:
> Hello,
> I've looked and couldn't find decent docs on this so for those of you
> who are lookin', this is a quick howto on how to setup the
> Cygwin/OpenSSH daemon on M$ Windows 2003. This will fix the passwordless
> (ssh key) login issue.
> 
> 1. Install Cygwin with the openssh binaries....
> 2. After completing the Cygwin setup, goto the cygwin command prompt and
> type 'ssh-host-config'
> 3. Answer 'y' when asked if you want to sshd with privilege separation.
> 4. Answer 'y' when asked if user sshd should be created by the script.
> 5. Answer 'y' when asked if you want sshd to be created as a service.
> 6. Create a new windows user named "sshdproc" or whatever you wish the
> sshd process account username to be. If you happen to notice the sshd
> user being disabled, don't enable it!
> 7. Place the sshdproc user in the "Administrators" group.
> 8. Give the sshdproc user the following system rights:
> 	* Create a token object
> 	* Log on as a service
> 	* Replace a process level token
> 
> 	And for security.....
> 	* Deny log on locally
> 	* Deny access to this computer from the network
> 
> 9. Reconfigure the "CYGWIN sshd service" to run as the new "sshdproc"
> user.
> 10. At the cygwin command prompt type 'mkpasswd -l |grep sshdproc >>
> /etc/passwd <enter>'
> 11. Type 'touch /var/log/sshd.log <enter>'
> 12. Type 'chmod 644 /var/log/sshd.log <enter>'
> 11. Type 'chown sshdproc /var/empty /var/log/sshd.log /etc/ssh_*
> <enter>'
> 12. Type 'cygrunsrv --start sshd <enter>'
> 
> That should be it.. Hope this helps! :)

It should.  Thanks for this description, it's exactly what is needed
in the mailing list archive.

Btw., the ssh-host-config already creates the sshd account, that's easy
from the command line.  But creating a useful sshdproc account as above
requires to be able to set user privileges like the famous "Create a
token object" privilege.  Does anybody know a way how to do this on the
command line which would allow ssh-host-config to do the above more or
less automagically?  If such a command line tool doesn't exist as part
of NT/2K/XP/03, would anybody be willing to create a simple command line
tool for inclusion in Cygwin?  It would be sufficient if that tool could
manipulate the above user privileges of an already existing user account.

Anybody?

It would be nice(TM) if we would move slowly to a Cygwin account called,
say, "root" with uid 0, so that all these sick handling of the SYSTEM
account with uid 18 could be dropped in favor of that root account.  It
would also be more naturally to people coming from a UNIX background.
A tool as the above would help to automate this as far as possible.

Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Developer                                mailto:cygwin@cygwin.com
Red Hat, Inc.

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