linux-kernel - Re: [ANNOUNCE] UidBind LSM 0.2

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Message-ID: <Pine.LNX.4.64.0704241809400.21879@mtl.rackplans.net>
Date:	Tue, 24 Apr 2007 18:11:26 -0400 (EDT)
From:	Gerhard Mack <gmack@...erfire.net>
To:	Casey Schaufler <casey@...aufler-ca.com>
cc:	Roberto De Ioris <roberto@...it.it>,
	linux-security-module@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [ANNOUNCE] UidBind LSM 0.2

On Tue, 24 Apr 2007, Casey Schaufler wrote:

> --- Gerhard Mack <gmack@...erfire.net> wrote:
> 
> > On Tue, 24 Apr 2007, Roberto De Ioris wrote:
> > 
> > > Hi all,
> > > 
> > > this is the second release for UidBind LSM:
> > > 
> > > http://projects.unbit.it/uidbind/
> > > 
> > > UidBind allows call to bind() function only to the uid defined in a
> > > configfs tree.
> > > 
> > > It is now possible to specify different uid (for the same port) on
> > > different ipv4 addresses:
> > > 
> > > mkdir uidbind/8081
> > > mkdir uidbind/8081/192.168.1.17
> > > mkdir uidbind/8081/192.168.1.26
> > > echo 1017 > uidbind/8081/192.168.1.17/uid
> > > echo 1026 > uidbind/8081/192.168.1.26/uid
> > > 
> > > This version even fix some leek in version 0.1
> > > 
> > > Patch attached is still for vanilla 2.6.20.7
> > 
> > Is it possible to specify ranges as allowing everyone?  Is it possible to 
> > allow multiple users acess to the same port?  Can ports be allowed by 
> > group?
> 
> If you're going to go beyond the simple owner access model it
> probably makes sense to go all out, swipe the file system ACL
> code and provide the whole nine yards of users, groups, and modes.
> The only system that I know of that had socket ACLs was the 4.X
> version of Trusted Irix, and socket ACLs were dropped in 5.0 because
> they were unpopular.
> 
> If you're daring you could propose that low number ports be treated
> the same way as other ports, with the default ownership being root and
> the default ACL allowing only root.

ACL may be more complicated than needed when a simple GID addition would 
make this right about perfect.

> > I really like the idea of this patch.  It has the potential to solve a lot 
> > of my current administrative headachs.
> 
> Putting access control on ports rather than sockets is a novel
> approach. It is a lot simpler underneath and more consistant with
> the way other object name spaces are treated.

Indeed I'm fond of it's rather simple and very scriptable interface.

	Gerhard

--
Gerhard Mack

gmack@...erfire.net

<>< As a computer I find your faith in technology amusing.
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