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Date: Wed, 7 May 2014 17:53:08 +0400
From: Andrey Repin <anrdaemon@yandex.ru>
Reply-To: cygwin@cygwin.com
Message-ID: <109019802.20140507175308@yandex.ru>
To: Corinna Vinschen <cygwin@cygwin.com>
Subject: Re: Microsoft Accounts (was Re: Problem with "None" Group on Non-Domain Members)
In-Reply-To: <20140507115730.GE30918@calimero.vinschen.de>
References: <20140505144745.GA6993@calimero.vinschen.de> <5367ACED.40409@breisch.org> <20140505154230.GB7694@calimero.vinschen.de> <5367B990.8050907@breisch.org> <20140505165723.GM30918@calimero.vinschen.de> <5367DEE5.5010407@breisch.org> <20140506125203.GO30918@calimero.vinschen.de> <53691564.1070200@breisch.org> <20140506171626.GZ30918@calimero.vinschen.de> <53692867.4060305@breisch.org> <20140507115730.GE30918@calimero.vinschen.de>
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Greetings, Corinna Vinschen!

> I toyed around with the Microsoft Account a bit more.  And here's why
> the primary group SID being identical to the user SID is not a good
> idea:

>   Security checks.

> For instance:

>   $ echo $USER
>   VMBERT8164+local_000
>   $ screen
>   Directory /tmp/uscreens/S-VMBERT8164+local_000 must have mode 700.

> Huh?

>   $ ls -l /tmp/uscreens/
>   total 0
>   drwxrwx---+ 1 VMBERT8164+local_000 VMBERT8164+local_000 0 May  7 12:44 S-VMBERT8164+local_000

> Uh Oh.

I concur.
But mostly because of blind check "if it's not 700, it's wrong".
No, it's not wrong, you dumb piece of code, it's your check isn't right.

> This will be a problem with other security sensitive applications, too.
> Sshd comes to mind.

> So I guess we really should make sure the primary group SID is some
> valid group, not the user's SID.

> "None" is not an option since it's not in the user token group list.

> "Users" seems to be the best choice at first sight.

For local SAM account.

> Alternatively we could use the S-1-11-xxx SID of the Microsoft Account.
> That would be in line with the idea to have a user-specific primary
> group.

For M$ accounts, perhaps.

> Thoughts?

I'm with you on this one.

P.S.
When you said I can set up a primary group for my account in SAM database,
what did you mean? The <cygwin/> magic or something more system-specific?


--
WBR,
Andrey Repin (anrdaemon@yandex.ru) 07.05.2014, <17:49>

Sorry for my terrible english...


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