[Samba] SID mapping: Samba and SSSD

Jeremy Allison jra at samba.org
Thu Sep 3 18:19:34 UTC 2020

On Thu, Sep 03, 2020 at 06:43:32PM +0100, Rowland penny via samba wrote:
> On 03/09/2020 18:04, Johan Hattne via samba wrote:
> > Dear all;
> > 
> > Would anybody be able to tell me what the idmap configuration is to have
> > Samba do the same SID-to-user/group mapping as the SSSD defaults?  I was
> > convinced I saw it on this list or the wiki not too long ago, but I
> > cannot seem to find it.
> > 
> > // Best wishes; Johan
> > 
> If you mean the large numbers that sssd seems to use, then that is probably
> not possible with Samba. From my understanding, sssd uses an algorithm that
> uses a combination of the domain SID and the user/group RID to calculate the
> Unix ID, or it uses the RFC2307 attributes. Samba calculates from the
> user/group RID + the lower range you set in smb.conf, or it uses the RFC2307
> attributes.

Hmmm. Would it be useful to add an idmap backend
that uses the same algorithm ?

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