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Re: tcb - the alternative to shadow

On Thu, 24 Aug 2006, Neal Becker wrote:

> Ralf Ertzinger wrote:
> > Hi.
> > 
> > On Thu, 24 Aug 2006 11:04:26 -0400, Neal Becker wrote:
> > 
> >> http://www.openwall.com/presentations/Owl/mgp00020.html
> > 
> > Hmmm. What is the advantage of this scheme? The first disadvantage
> > that springs to my mind is that any attacker that gains user privileges
> > (browser bug or whatever) can suddenly change the user password.
> > 
> How is that a disadvantage, compared to existing systems?  With previous
> systems, if you gain user priv you can also change user password.  I think
> the idea of tcb is that's all you can do.  No suid root stuff is used. 
> (Honestly, I don't know much about tcb - I just thought it might be of
> interest)

I think Ralf was thinking that tcb would permit something conceptually 
along the lines of

$ vi /etc/tcb/`id -un`/shadow

to change your existing passwd w/o having to know it

The permissions on /etc/tcb should prevent that though -- only an sgid 
shadow app (the passwd command) can be used....


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