Security Identifier (SID) to User Identifier (uid) ResolutionSystem

Nicolas Williams Nicolas.Williams at
Tue Dec 28 20:15:39 GMT 1999

On Wed, Dec 29, 1999 at 06:47:29AM +1100, Luke Kenneth Casson Leighton wrote:
> > Two possible improvements over this are:
> > 
> >  - allow administrators to specify a different SID to use as the base
> >    for uid/gid<->sid conversions, such as a domain SID whose domain name
> >    might indicate to users that the SID represents an entity in a domain
> >    of *nix systems (the domain's PDC would have to be a Samba server OR
> >    the mapping algorythm would have to match NT's POSIX subsystem's)
> > 
> no, because:
> 1) this has security implications for people who join their own samba
> server to a domain, and people start relying on the SIDs being for a
> particular server, and then they get changed????
> 2) if you specify a different SID base you then exclude the users in the
> domain you just changed it from.

So? Those SIDs had local meaning only anyways. If those SIDs were reused
on NT filesystems then the worst you do is orphan those SIDs in those
files' ACLs.

And for new installations this is not a problem. So the option would be
nice. Could an administrator use it to shoot him or herself in the
foot? Sure. But that's true in worse ways now (e.g., setting up a Samba
server as a PDC for a domain with an existing NT PDC). So for
consistency's sake it's not a bad idea to givem more rope...



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