Support of fragmentation of RADIUS packets
draft-ietf-radext-radius-fragmentation-07

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Document Type Active Internet-Draft (radext WG)
Last updated 2014-07-04
Replaces draft-perez-radext-radius-fragmentation
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Intended RFC status Experimental
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RADIUS EXTensions Working Group                          A. Perez-Mendez
Internet-Draft                                            R. Marin-Lopez
Updates: RFC6929 (if approved)                      F. Pereniguez-Garcia
Intended status: Experimental                            G. Lopez-Millan
Expires: January 5, 2015                            University of Murcia
                                                                D. Lopez
                                                          Telefonica I+D
                                                                A. DeKok
                                                          Network RADIUS
                                                            July 4, 2014

               Support of fragmentation of RADIUS packets
               draft-ietf-radext-radius-fragmentation-07

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 January 5, 2015.

Copyright Notice

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

Perez-Mendez, et al.     Expires January 5, 2015                [Page 1]
Internet-Draft       Fragmentation of RADIUS packets           July 2014

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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.1.  Requirements Language  . . . . . . . . . . . . . . . . . .  4
   2.  Scope of this document . . . . . . . . . . . . . . . . . . . .  4
   3.  Overview . . . . . . . . . . . . . . . . . . . . . . . . . . .  7
   4.  Fragmentation of packets . . . . . . . . . . . . . . . . . . .  9
     4.1.  Pre-authorization  . . . . . . . . . . . . . . . . . . . . 10
     4.2.  Post-authorization . . . . . . . . . . . . . . . . . . . . 14
   5.  Chunk size . . . . . . . . . . . . . . . . . . . . . . . . . . 17
   6.  Allowed large packet size  . . . . . . . . . . . . . . . . . . 18
   7.  Handling special attributes  . . . . . . . . . . . . . . . . . 19
     7.1.  Proxy-State attribute  . . . . . . . . . . . . . . . . . . 19
     7.2.  State attribute  . . . . . . . . . . . . . . . . . . . . . 20
     7.3.  Service-Type attribute . . . . . . . . . . . . . . . . . . 21
     7.4.  Rebuilding the original large packet . . . . . . . . . . . 21
   8.  New flag T field for the Long Extended Type attribute
       definition . . . . . . . . . . . . . . . . . . . . . . . . . . 22
   9.  New attribute definition . . . . . . . . . . . . . . . . . . . 22
     9.1.  Frag-Status attribute  . . . . . . . . . . . . . . . . . . 22
     9.2.  Proxy-State-Len attribute  . . . . . . . . . . . . . . . . 23
     9.3.  Table of attributes  . . . . . . . . . . . . . . . . . . . 24
   10. Operation with proxies . . . . . . . . . . . . . . . . . . . . 25
     10.1. Legacy proxies . . . . . . . . . . . . . . . . . . . . . . 25
     10.2. Updated proxies  . . . . . . . . . . . . . . . . . . . . . 25
   11. Operational considerations . . . . . . . . . . . . . . . . . . 27
     11.1. Flag T . . . . . . . . . . . . . . . . . . . . . . . . . . 27
     11.2. Violation of RFC2865 . . . . . . . . . . . . . . . . . . . 28
     11.3. Proxying based on User-Name  . . . . . . . . . . . . . . . 28
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