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Date:	Tue, 31 Mar 2015 23:55:03 +0300
From:	Andrey Repin <anrdaemon AT yandex DOT ru>
Reply-To:	cygwin AT cygwin DOT com
Message-ID:	<1837571490.20150331235503@yandex.ru>
To:	Eliot Moss <moss AT cs DOT umass DOT edu>, cygwin AT cygwin DOT com
Subject:	Re: More about permissions
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Greetings, Eliot Moss!

>> Why does SYSTEM need full access to the files?  If it's a backup tool,
>> it has SE_BACKUP_NAME/SE_RESTORE_NAME access anyway.  Every tool with
>> Administrators in the token has the right to enable these access rights
>> anyway.

> I am not sure this particular program (CrashPlan) works that way.

That's not program property, but the user you run the program from.

> I suppose that I am seeing SYSTEM as the moral equivalent of root in
> POSIX. In POSIX, root can access anything, and I don't believes ACLs
> can lock it out.  I agree that Windows does not really have the concept
> of a single 'root'.  Administrators is close, but the various aspects
> of root are split up in different ways.  We're not going to get a
> perfect mapping.

I think i've explained it earlir, but here's it again:
In POSIX model, root have implicit permissions.
In Windows model, there NO implicit permissions at all. Everything should be
explicitly assigned. I.e. SeBackupRestore privilege.
If you deny SYSTEM access to a file, OS will not be able to do anything about
it. Been there, blocked changes to cmd.exe when I was experimenting with 4NT.
(And cmd.exe was in fact renamed 4nt.exe.) None of the Windows autotools were
able to get around it.

> Maybe what I am looking for is something like this:

> - Certain Windows accounts/groups would be treated as 'root' for cygwin's
>    purposes, perhaps controlled by a list in a file read when cygwin starts up.

The list would be very short. "NT AUTHORITY\SYSTEM".


-- 
With best regards,
Andrey Repin
Tuesday, March 31, 2015 23:48:58

Sorry for my terrible english...


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