[OpenAFS] Documentation or howto for Active Directory as KDC

[Jeffrey Altman]

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Silvia Roedelsperger wrote:
> Hi,
> 
> first I want to thank you for the link. We'll try it out, if we have
> some time :-)
> 
> You've asked, if it's the same realm:
> Yes, (unfortunately) it's the same realm name for both.
> 
> Greetings, Silvia

It is ok for there to be an AFS cell name that matches an Active
Directory domain name.  It is not ok for there to be two independent
Kerberos realms with the same name.   The clients have no way to
determine which realm they need to speak with for which services
and there is no ability to setup cross realm key exchanges when the
realm names are the same.

If the cell name is foobar.de and both realm names are FOOBAR.DE
AND all of the user identities are guaranteed to be the same in the
two realms, then I would do the following:

  Create an "afs/foobar.de@FOOBAR.DE" service principal in both
  the Active Directory domain and the MIT/Heimdal realm

  Generate keytabs for each such that the key version number of
  the service principal in each realm is unique

  Import both keys into the AFS KeyFile using asetkey.


This will permit the AFS services to be able to accept tickets
issued by both realms.  However it is only safe to do this if
and only if the user principal names in both realms are issued
by the same controlling organization and will always be for the
same individual or service.  If you do this, AFS will have no
method of distinguishing between a user in one realm vs the
other.

Jeffrey Altman
Secure Endpoints Inc.


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