/dev/ptmx fails with Azure accounts

Corinna Vinschen corinna-cygwin@cygwin.com
Tue Aug 2 13:50:00 GMT 2016

On Aug  2 11:54, Corinna Vinschen wrote:
> On Aug  1 22:24, Thomas Wolff wrote:
> > For Azure Domain users (and I do not really know what that means),
> > pts handling does not seem to work, at least not for mintty, where forkpty()
> > fails.
> > Please check https://github.com/mintty/mintty/issues/563 for a discussion,
> > and my comment
> > https://github.com/mintty/mintty/issues/563#issuecomment-235310199
> > 
> > Also, there has been a similar report here:
> > https://sourceware.org/ml/cygwin/2016-02/msg00046.html
> > 
> > I have no idea how to establish a working startup of mintty for those users.
> The problem here is that it's impossible to generate access
> permissions for the pty with those weird accounts.  I like it
> how Microsoft screws up otherwise working software with this
> strange domain handling.
> To fix this we have to be able to come up with a working user and group
> account for these cases.  For that I need at least output from `whoami
> /all'.  I wonder why supposedly nobody tried that after /fqdn didn't
> work.
> This may be fixable by somebody with such an account and willing to hack
> on the Cygwin function pwdgrp::fetch_account_from_windows().  There's
> already some code for the so-called "Windows accounts" which seem to
> work in a similar fashion (albeit in this case the user has a local
> account SID).
> Alternatively I need at least a guinea pig with such an account,

There's another problem with those accounts.  If they act like a domain
account, but there's no valid domain info on the machine (*), then who
should Cygwin ask for shell and home dir?

(*) That's the cause of the "Unknown domain AzureAD".  Usually the local
    machine has a list of domains which is refreshed once in a while.
    Even the local machine SAM is a domain in this view.

    However, while the LookupAccountSid function seems to return
    "AzureAD" as the domain name for this account, the domain list on
    the local machine does not contain this domain.


Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat
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