"algorithmic rid base" bogus?

Andrew Bartlett abartlet at samba.org
Tue Dec 27 23:10:50 GMT 2005

On Tue, 2005-12-27 at 23:56 +0100, Volker Lendecke wrote:
> On Tue, Dec 27, 2005 at 03:38:16PM -0700, John H Terpstra wrote:
> > > The only thought I have was possibly by copying a file (with ACLs) off
> > > their file-server?
> > 
> > Simple solution. If foreign domain support (non-local SIDs) is disabled we 
> > refuse to copy the file across. In all other cases, we look up the name 
> > attached to the SID, then create a local mapping and call the "add group 
> > script" to create a UNIX user or group that is auto-mapped to the Windows 
> > account (user or group). In all cases preserving the original SID.
> > 
> > What am I missing here?
> You're missing that we're talking about files *already* copied with the
> algorithmic mapping. The new one would get a 'S-1-22-2-<gid>' ACL entry.
> Argl. This kills all files copied away from Samba to Windows with ACL entries
> without explicit mappings.  For copies of Samba->Samba we end up with the same
> gid, and assuming we have a consistent idmap we're fine here a well.
> The Samba->Windows file copy might just assume we have explicit mappings for
> all acl entries. Is that something we can live with?

Remembering that the user cannot have created the ACL from windows, it
must have been created with a POSIX command line tool.  This narrows
down the users a *lot*.

Andrew Bartlett

Andrew Bartlett                                http://samba.org/~abartlet/
Authentication Developer, Samba Team           http://samba.org
Student Network Administrator, Hawker College  http://hawkerc.net
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