NAI-based Dynamic Peer Discovery for RADIUS/TLS and RADIUS/DTLS
draft-ietf-radext-dynamic-discovery-12

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RADIUS Extensions Working Group                                S. Winter
Internet-Draft                                                   RESTENA
Intended status: Experimental                                M. McCauley
Expires: April 30, 2015                                              OSC
                                                        October 27, 2014

    NAI-based Dynamic Peer Discovery for RADIUS/TLS and RADIUS/DTLS
                 draft-ietf-radext-dynamic-discovery-12

Abstract

   This document specifies a means to find authoritative RADIUS servers
   for a given realm.  It is used in conjunction with either RADIUS/TLS
   and RADIUS/DTLS.

Status of This Memo

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   This Internet-Draft will expire on April 30, 2015.

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   Copyright (c) 2014 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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Winter & McCauley        Expires April 30, 2015                 [Page 1]
Internet-Draft            RADIUS Peer Discovery             October 2014

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3
     1.2.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
     1.3.  Document Status . . . . . . . . . . . . . . . . . . . . .   4
   2.  Definitions . . . . . . . . . . . . . . . . . . . . . . . . .   4
     2.1.  DNS Resource Record definition  . . . . . . . . . . . . .   4
       2.1.1.  S-NAPTR . . . . . . . . . . . . . . . . . . . . . . .   4
       2.1.2.  SRV . . . . . . . . . . . . . . . . . . . . . . . . .   9
       2.1.3.  Optional name mangling  . . . . . . . . . . . . . . .   9
     2.2.  Definition of the X.509 certificate property
           SubjectAltName:otherName:NAIRealm . . . . . . . . . . . .  11
   3.  DNS-based NAPTR/SRV Peer Discovery  . . . . . . . . . . . . .  12
     3.1.  Applicability . . . . . . . . . . . . . . . . . . . . . .  12
     3.2.  Configuration Variables . . . . . . . . . . . . . . . . .  13
     3.3.  Terms . . . . . . . . . . . . . . . . . . . . . . . . . .  13
     3.4.  Realm to RADIUS server resolution algorithm . . . . . . .  14
       3.4.1.  Input . . . . . . . . . . . . . . . . . . . . . . . .  14
       3.4.2.  Output  . . . . . . . . . . . . . . . . . . . . . . .  15
       3.4.3.  Algorithm . . . . . . . . . . . . . . . . . . . . . .  15
       3.4.4.  Validity of results . . . . . . . . . . . . . . . . .  17
       3.4.5.  Delay considerations  . . . . . . . . . . . . . . . .  18
       3.4.6.  Example . . . . . . . . . . . . . . . . . . . . . . .  18
   4.  Operations and Manageability Considerations . . . . . . . . .  20
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  21
   6.  Privacy Considerations  . . . . . . . . . . . . . . . . . . .  22
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  24
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  25
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  25
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  26
   Appendix A.  Appendix A: ASN.1 Syntax of NAIRealm . . . . . . . .  27

1.  Introduction

   RADIUS in all its current transport variants (RADIUS/UDP, RADIUS/TCP,
   RADIUS/TLS, RADIUS/DTLS) requires manual configuration of all peers
   (clients, servers).

   Where more than one administrative entity collaborates for RADIUS
   authentication of their respective customers (a "roaming
   consortium"), the Network Access Identifier (NAI)
   [I-D.ietf-radext-nai] is the suggested way of differentiating users
   between those entities; the part of a username to the right of the @
   delimiter in an NAI is called the user's "realm".  Where many realms