Support of fragmentation of RADIUS packets
draft-ietf-radext-radius-fragmentation-00

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Last updated 2013-08-27
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RADIUS EXTensions Working Group                          A. Perez-Mendez
Internet-Draft                                            R. Marin-Lopez
Intended status: Experimental                       F. Pereniguez-Garcia
Expires: February 28, 2014                               G. Lopez-Millan
                                                    University of Murcia
                                                                D. Lopez
                                                          Telefonica I+D
                                                                A. DeKok
                                                          Network RADIUS
                                                         August 27, 2013

               Support of fragmentation of RADIUS packets
               draft-ietf-radext-radius-fragmentation-00

Abstract

   The Remote Authentication Dial-In User Service (RADIUS) protocol is
   limited to a total packet size of 4096 octets.  Provisions exist for
   fragmenting large amounts of authentication data across multiple
   packets, via Access-Challenge.  No similar provisions exist for
   fragmenting large amounts of authorization data.  This document
   specifies how existing RADIUS mechanisms can be leveraged to provide
   that functionality.  These mechanisms are largely compatible with
   existing implementations, and are designed to be invisible to
   proxies, and "fail-safe" to legacy clients and servers.

Status of this Memo

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

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on February 28, 2014.

Copyright Notice

   Copyright (c) 2013 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Perez-Mendez, et al.    Expires February 28, 2014               [Page 1]
Internet-Draft       Fragmentation of RADIUS packets         August 2013

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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.1.  Requirements Language  . . . . . . . . . . . . . . . . . .  4
   2.  Scope of this document . . . . . . . . . . . . . . . . . . . .  4
   3.  Overview . . . . . . . . . . . . . . . . . . . . . . . . . . .  5
   4.  Fragmentation of packets . . . . . . . . . . . . . . . . . . .  7
     4.1.  Pre-authorization  . . . . . . . . . . . . . . . . . . . .  8
     4.2.  Post-authorization . . . . . . . . . . . . . . . . . . . . 12
   5.  Chunk size . . . . . . . . . . . . . . . . . . . . . . . . . . 14
   6.  Allowed large packet size  . . . . . . . . . . . . . . . . . . 15
   7.  Handling special attributes  . . . . . . . . . . . . . . . . . 16
     7.1.  Proxy-State attribute  . . . . . . . . . . . . . . . . . . 16
     7.2.  State attribute  . . . . . . . . . . . . . . . . . . . . . 17
     7.3.  Service-Type attribute . . . . . . . . . . . . . . . . . . 17
     7.4.  Rebuilding the original large packet . . . . . . . . . . . 17
   8.  New attribute definition . . . . . . . . . . . . . . . . . . . 18
     8.1.  Frag-Status attribute  . . . . . . . . . . . . . . . . . . 18
     8.2.  Proxy-State-Len attribute  . . . . . . . . . . . . . . . . 19
     8.3.  Table of attributes  . . . . . . . . . . . . . . . . . . . 20
   9.  Operation with proxies . . . . . . . . . . . . . . . . . . . . 20
     9.1.  Legacy proxies . . . . . . . . . . . . . . . . . . . . . . 20
     9.2.  Updated proxies  . . . . . . . . . . . . . . . . . . . . . 21
   10. Security Considerations  . . . . . . . . . . . . . . . . . . . 22
   11. IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 23
   12. References . . . . . . . . . . . . . . . . . . . . . . . . . . 23
     12.1. Normative References . . . . . . . . . . . . . . . . . . . 23
     12.2. Informative References . . . . . . . . . . . . . . . . . . 24
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 24
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