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Subject: Kerberos use cases

As per the teleconf last night let me articulate the Kerberos use cases on
the table;

1. Bridge Server:

	This is a middleware translation gateway, where on one side will be a SAML
based environment and the other a Kerberos based RPC application (e.g. MS

2.  Kerberos Clients/Browsers:

	the local environment consist of workstations that are Kerberos enabled
with the user using Kerberos to authenticate to the local domain.  The user
then wishes to access a remote domain using a browser without having to be
re-authenticated.  The SAML 2.0 Browser profiles will be used to provide the
SAML assertion to the remote domain.  In this Kerberos means either "pure"
Kerberos, Windows 2000/2003 or DCE.  In many respects this use case - when
you have a PC which is within a windows 2000/2003 domain - could be widely
used within a intranet/extranet environment.

There are actually two options for this use case:

2(a) Using the Credential Conversion Service

an architectural enhancement is to provide a separate service that permits
Kerberos tickets, Windows PACs or DCE PACS to be normatively translated into
a SAML assertion.  This does not mean the PAC information would be carried
within the SAML assertion, but rather translation would take place.  For
example group membership/privilege from a PAC would cause a suitable SAML
attribute statement to be generated

2(b) Not using the Credential Conversion Service

This is where no Credential Conversion Service would be provided and its to
the implementer how they would architect their solution.  However i'ts still
recommended that a normative approach is adopted for PAC translation

I hope this makes the use cases clearer.


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