The Network Access Identifier
RFC 7542

Document Type RFC - Proposed Standard (May 2015; No errata)
Obsoletes RFC 4282
Last updated 2015-10-14
Replaces draft-dekok-radext-nai
Stream IETF
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Stream WG state Submitted to IESG for Publication
Document shepherd Stefan Winter
Shepherd write-up Show (last changed 2014-12-04)
IESG IESG state RFC 7542 (Proposed Standard)
Consensus Boilerplate Yes
Telechat date
Responsible AD Benoit Claise
Send notices to (None)
IANA IANA review state Version Changed - Review Needed
IANA action state No IC
Internet Engineering Task Force (IETF)                          A. DeKok
Request for Comments: 7542                                    FreeRADIUS
Obsoletes: 4282                                                 May 2015
Category: Standards Track
ISSN: 2070-1721

                     The Network Access Identifier

Abstract

   In order to provide inter-domain authentication services, it is
   necessary to have a standardized method that domains can use to
   identify each other's users.  This document defines the syntax for
   the Network Access Identifier (NAI), the user identifier submitted by
   the client prior to accessing resources.  This document is a revised
   version of RFC 4282.  It addresses issues with international
   character sets and makes a number of other corrections to RFC 4282.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc7542.

DeKok                        Standards Track                    [Page 1]
RFC 7542              The Network Access Identifier             May 2015

Copyright Notice

   Copyright (c) 2015 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
   10, 2008.  The person(s) controlling the copyright in some of this
   material may not have granted the IETF Trust the right to allow
   modifications of such material outside the IETF Standards Process.
   Without obtaining an adequate license from the person(s) controlling
   the copyright in such materials, this document may not be modified
   outside the IETF Standards Process, and derivative works of it may
   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   than English.

DeKok                        Standards Track                    [Page 2]
RFC 7542              The Network Access Identifier             May 2015

Table of Contents

   1. Introduction ....................................................4
      1.1. Terminology ................................................6
      1.2. Requirements Language ......................................7
      1.3. Purpose ....................................................7
      1.4. Motivation .................................................9
   2. NAI Definition .................................................10
      2.1. UTF-8 Syntax and Normalization ............................10
      2.2. Formal Syntax .............................................11
      2.3. NAI Length Considerations .................................11
      2.4. Support for Username Privacy ..............................12
      2.5. International Character Sets ..............................13
      2.6. The Normalization Process .................................14
           2.6.1. Issues with the Normalization Process ..............15
      2.7. Use in Other Protocols ....................................16
      2.8. Using the NAI Format for Other Identifiers ................17
   3. Routing inside of AAA Systems ..................................18
      3.1. Compatibility with Email Usernames ........................19
      3.2. Compatibility with DNS ....................................20
      3.3. Realm Construction ........................................20
           3.3.1. Historical Practices ...............................21
      3.4. Examples ..................................................22
   4. Security Considerations ........................................23
      4.1. Correlation of Identities over Time and Protocols .........23
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