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Date: Tue, 16 Aug 2016 17:45:26 +0200
From: Corinna Vinschen <corinna-cygwin@cygwin.com>
To: cygwin@cygwin.com
Subject: Re: /dev/ptmx fails with Azure accounts
Message-ID: <20160816154526.5snup4t2423hijbu@calimero.vinschen.de>
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Hi Russell,

On Aug 16 11:27, rmora@aboutgolf.com wrote:
> Hi Corinna
>=20
> On Tuesday, August 16, 2016 05:12, "Corinna Vinschen" <corinna-cygwin@cyg=
win.com> said:
>=20
> > Hi Russell,
> >=20
> > This is as bad as I feared.  Apart from the username and the Windows
> > home dir, there are no other information which could be fetched by
> > the usual means.  Quite apart from the fact that there are no means to
> > *store* this information somewhere, other than creating an explicit
> > /etc/passwd and matching /etc/group entry.
> >=20
> > But, anyway, I prepared some code for the Cygwin DLL to handle these
> > accounts even if no /etc/passwd and /etc/group entries are present.  It
> > still needs some work, though, and for that I'd ask you to perform a
> > last test.
> >=20
> > I attached a short testcase.  We know that LookupAccountSid from the
> > user SID in the user token returns a name (RussellMora) and a domain
> > (AzureAD).  However, the open question is if the reverse operation
> > LookupAccountName works as desired when feeding it the domain name
> > and the user name.  Actually, for completeness the testcase tries it
> > two ways:  Once only with the username, once with dom\username.
> >=20
> > The reason for testing this is, if the reverse lookup works with only
> > the name we *could* go ahead and omit the domain from the Cygwin
> > username.  I'm not yet sure if that's feasible, but it's certainly worth
> > a try.
> >=20
>=20
> Both seem to work. I guess what you are proposing makes sense - the
> AzureAD domain is like a single domain with multiple tenants (yeah, I
> don't really know what I'm talking about with respect to AD....).
> Anyway, let me know if you want me to do any more testing, I'm still
> very willing to be a Guinea Pig (squeek squeek) - thanks for figuring
> this out for me!
>=20
> Unknown+User@Lenovo-PC /cygdrive/c/cygwin64
> $ gcc -W azure-check5.c -l Netapi32 -o azure-check5
>=20
> Unknown+User@Lenovo-PC /cygdrive/c/cygwin64
> $ ./azure-check5
> Sid: S-1-12-1-2043906341-1249388050-2635137163-399631282
> Dom\Name: AzureAD\RussellMora
> Reverse Sid (RussellMora): S-1-12-1-2043906341-1249388050-2635137163-3996=
31282
> Reverse Sid (AzureAD\RussellMora): S-1-12-1-2043906341-1249388050-2635137=
163-399631282

Good to know, thank you.  Give me a bit and I'll come up with a Cygwin
DLL for testing.


Stay tuned,
Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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