[OpenAFS] mutimaster AD model and cross-realm

Jeffrey Altman jaltman@columbia.edu
Wed, 11 May 2005 16:29:04 -0400


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Dean Knape wrote:

> This was Re: [OpenAFS] new infrastructure-afs home and backup questions
> but so not to confuse that thread I'm starting anew.

By replying to the previous thread, you are still in the previous
thread.  Changing the name of the subject does not alter what message
thread you are in.

> We've successfully implemented a cross-realm trust between a Kerberos
> realm and single AD domain.  After principal mapping, users are able to
> login with their Kerberos principle at AD domain member workstations.
> 
> The next thing we need to test and get working is the integration of a
> Kerberos realm into a multimaster AD domain model.  Here's our current
> AD model:
> 
> enterprise AD domain .......  TOP
>                                |            \
>                                |             D
>                                |            /
>                                |--------
>                               / \      |
>                              /   \     |
>                             /     \    |
> user AD domains .........   A      B   |
>                                        |
>                                        |
>                                        |
> resource AD domain .................   C
> 
> 
> external Kerberos realm ( domain D floating up there )
> 
> 
> This gives us:
> 
> Active directory domains
> ------------------------
> TOP.njit.edu
> A.TOP.njit.edu
> B.TOP.njit.edu
> C.TOP.njit.edu
> 
> Kerberos realm
> --------------
> D.njit.edu
> 
> Our AFS cell
> ------------
> D.njit.edu
> 
> Our TOP domain contains no users (only domain admin & related). This is
> the root of our AD and provides DNS, etc. to subdomains.
> 
> Domain A & B contain user accounts and some workstation accounts.
> 
> Domain C is resource domain and primarily for lab computer accounts and
> servers providing services to both students and faculty.  There are no
> user accounts here either.  Users from domain A and B need to have their
> identities mapped in such a way so they can sit at lab workstation whos
> computer account is in domain C but their user account is in either
> domain A or domain B.  We're fortunate to have user uniques user
> accounts across user domains.

If you are going to be mapping Kerberos principals from D to accounts
in the forest, the user accounts should exist in TOP not A and not B.
You are centrally controlling the name space at D, therefore you should
not be giving the ability to create user accounts mapped to that name
space to individual departments via the use of sub-domains.

> Now for my question -
> 
> What trust relationships and user identity mappings are needed to have
> to have users from domains A & B login to workstations/servers with
> computer accounts in domain C using their Kerberos realm identity?
> 
> sweating ...

The sub-domains should have knowledge of the existence of realm D
but do not have to have trusts with it.   The trust relationship is
between D and TOP.

Note: By using a multi-domain forest you will be making it impossible
(due to a Microsoft bug) for you to provide roaming profiles mapped
to AFS.

Jeffrey Altman



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