From: Corinna Vinschen <corinna-cygwin@cygwin.com>
To: cygwin@cygwin.com
Subject: Re: Microsoft Accounts (was Re: Problem with "None" Group on Non-Domain Members)
Date: Wed, 07 May 2014 14:20:00 -0000 [thread overview]
Message-ID: <20140507142012.GJ30918@calimero.vinschen.de> (raw)
In-Reply-To: <109019802.20140507175308@yandex.ru>
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On May 7 17:53, Andrey Repin wrote:
> 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.
No, the check is right from a POSIX POV. How is a POSIX application
supposed to know that the group with gid 12345 is in fact the user
with the uid 12345? That's not possible in a POSIX environment.
> > 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.
...or "Domain Users" for AD accounts, probably.
> > 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.
Eh? This thread *is* about Microsoft Accounts. We don't have this
problem for normal accounts.
> 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?
The <cygwin/> magic, yes.
Corinna
--
Corinna Vinschen Please, send mails regarding Cygwin to
Cygwin Maintainer cygwin AT cygwin DOT com
Red Hat
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next prev parent reply other threads:[~2014-05-07 14:20 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-05 13:49 Problem with "None" Group on Non-Domain Members Chris J. Breisch
2014-05-05 13:59 ` Corinna Vinschen
2014-05-05 14:17 ` Chris J. Breisch
2014-05-05 14:47 ` Corinna Vinschen
2014-05-05 15:23 ` Chris J. Breisch
2014-05-05 15:42 ` Corinna Vinschen
2014-05-05 16:17 ` Chris J. Breisch
2014-05-05 16:57 ` Corinna Vinschen
2014-05-05 18:52 ` Robert Pendell
2014-05-06 13:02 ` Corinna Vinschen
2014-05-05 18:56 ` Chris J. Breisch
2014-05-05 19:44 ` Larry Hall (Cygwin)
2014-05-05 21:57 ` Chris J. Breisch
2014-05-05 22:07 ` Chris J. Breisch
2014-05-05 22:29 ` Larry Hall (Cygwin)
2014-05-05 22:39 ` Chris J. Breisch
2014-05-06 0:43 ` Larry Hall (Cygwin)
2014-05-06 12:23 ` Chris J. Breisch
2014-05-05 22:09 ` Larry Hall (Cygwin)
2014-05-06 12:52 ` Microsoft Accounts (was Re: Problem with "None" Group on Non-Domain Members) Corinna Vinschen
2014-05-06 12:55 ` Corinna Vinschen
2014-05-06 13:01 ` Corinna Vinschen
2014-05-07 12:26 ` vlado99
2014-05-07 12:43 ` Corinna Vinschen
2014-05-06 17:01 ` Chris J. Breisch
2014-05-06 17:16 ` Corinna Vinschen
2014-05-06 18:22 ` Chris J. Breisch
2014-05-07 11:57 ` Corinna Vinschen
2014-05-07 12:40 ` Corinna Vinschen
2014-05-07 14:09 ` Chris J. Breisch
2014-05-07 14:46 ` Corinna Vinschen
2014-05-08 20:09 ` Corinna Vinschen
2014-05-08 23:18 ` Robert Pendell
2014-05-09 0:12 ` Ken Brown
2014-05-09 1:34 ` Robert Pendell
2014-05-09 6:11 ` Achim Gratz
2014-05-09 7:42 ` Corinna Vinschen
2014-05-07 14:05 ` Chris J. Breisch
2014-05-07 14:35 ` Corinna Vinschen
2014-05-07 14:05 ` Andrey Repin
2014-05-07 14:20 ` Corinna Vinschen [this message]
2014-05-07 14:43 ` Corinna Vinschen
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