Date: Tue, 30 Sep 2008 18:33:46 +0200
From: Corinna Vinschen <corinna-cygwin@cygwin.com>
To: cygwin@cygwin.com
Subject: Re: Cygwin Everyone group permissions and Vista "shared files" 	(*not* shared folders)
Message-ID: <20080930163346.GK11053@calimero.vinschen.de>
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References: <5e4cc4153gf115hcpi4ilk2s787klg6sra@4ax.com> <20080929165252.GC11053@calimero.vinschen.de>
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On Sep 29 18:52, Corinna Vinschen wrote:
> On Sep  9 07:47, Barry Kelly wrote:
> > Unfortunately, Cygwin creates an ACE for the group Everyone, even with
> > umask 0077, or after chmod 0700 is applied. Specifically, this is what
> > it looks like using cacls:
> > 
> >                      Everyone:(special access:)
> >                               READ_CONTROL
> >                               FILE_READ_EA
> >                               FILE_READ_ATTRIBUTES
> > 
> > How can addition of this ACE be controlled or prevented by default for
> > Cygwin applications?
> 
> It can't be prevented right now.  I added "don't create null
> group/everyone ACEs to file ACLs" on my Cygwin 1.7 TODO list.

Fresh back from vacation I missed the crucial point here.  Sorry.

The real answer is:  It can't be prevented and there are no plans to add
code to prevent it, since these read permissions are required to get
POSIX-like permissions.

Unless, of course, you go without POSIX permissions entirely.  The
setting for this is the "nontsec" keyword in the environment variable
$CYGWIN until Cygwin 1.5.25(*), which has global scope, or the mount
point option "noacl" in /etc/fstab starting with Cygwin 1.7(**), which
has a per-mount point scope.  Using nontsec/noacl will result in getting
Windows default permissions instead of POSIX equivalent permissions.


Corinna


(*)  http://cygwin.com/cygwin-ug-net/using-cygwinenv.html
(**) Preliminary docs:
     http://cygwin.com/1.7/cygwin-ug-net/using.html#mount-table

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat

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