Diameter Messages in Kerberos5 AuthorizationData
draft-vanrein-krb5-authzdata-diameter-00

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Network Working Group                                        R. Van Rein
Internet-Draft                                                 ARPA2.net
Intended status: Experimental                           October 20, 2018
Expires: April 23, 2019

            Diameter Messages in Kerberos5 AuthorizationData
                draft-vanrein-krb5-authzdata-diameter-00

Abstract

   The Kerberos5 infrastructure is concerned with authentication, but it
   can also carry AuthorizationData in a variety of formats.  Diameter
   is an extensible standard for the expression of authorisation
   information.  This specification defines an embedding of Diameter
   data in the AuthorizationData fields of Kerberos5.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on April 23, 2019.

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Internet-Draft             Kerberos5 Diameter               October 2018

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Embedding Diameter in Kerberos5 . . . . . . . . . . . . . . .   3
   3.  InternetWide Usage Pattern  . . . . . . . . . . . . . . . . .   4
   4.  Example Application . . . . . . . . . . . . . . . . . . . . .   6
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .   7
     7.2.  Informative References  . . . . . . . . . . . . . . . . .   8
   Appendix A.  Acknowledgements . . . . . . . . . . . . . . . . . .   8
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   8

1.  Introduction

   Kerberos5 [RFC4120] is a single-signon system that automatically
   supplies users with authentication tickets to individual services.
   Such tickets tend to last as long as a maximum user session, usually
   up to a day.  They are provided by a central realm service known as
   the Key Distribution Center or KDC.

   Though designed for authention rather than authorisation, KDC
   exchanges lend themselves well to facilitate both.  The message
   formats can carry AuthorizationData consisting of a numerical tag and
   data to be interpreted according to that tag.  This specification
   adds a tag value to describe AuthorizationData holding Diameter
   protocol messages.

   AuthorizationData can be included in requests to the KDC, and the KDC
   can include AuthorizationData in a ticket.  When requesting a service
   ticket from the KDC, a single-signon ticket with possible
   AuthorizationData is attached to that request.  All this data is
   protected in transit; requests to the KDC are encrypted with the TGT
   secret or a sub-secret; tickets pass it to a service using a key
   shared between the server and KDC.

   Diameter frames [RFC6733] hold a list of Attribute-Value Pairs (AVP),
   with optional nesting into group AVPs.  The format is easily parsed
   and applications exist (or can be defined) to capture a class of
   usage scenarios.  Among the existing applications is a network access
   application that lends itself for most authorisation applications.

   The purpose of using Diameter in this place is to employ the existing
   communication infrastructure of Kerberos to pass authorisation
   settings between hosts.  The standardised format simplifies access to
   services in foreign realms; this is useful to the InternetWide.org
   purpose to Bring Your Own IDentity (BYOID), which requires passing

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