ENUM -- Telephone Number Mapping A. Mayrhofer
Working Group enum.at
Internet-Draft May 04, 2007
Expires: November 5, 2007
IANA Registration for Enumservice 'XMPP'
draft-ietf-enum-xmpp-02
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Copyright (C) The IETF Trust (2007).
Abstract
This document requests IANA registration of an Enumservice for XMPP,
the Extensible Messaging and Presence Protocol. This Enumservice
specifically allows the use of 'xmpp' Uniform Resource Identifiers
(URIs) in the context of E.164 Number Mapping (ENUM).
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Change Log . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . 4
4. ENUM Service Registration - XMPP . . . . . . . . . . . . . . . 4
5. XMPP IRI/URI considerations for ENUM . . . . . . . . . . . . . 4
5.1. Authority Component . . . . . . . . . . . . . . . . . . . . 4
5.2. IRI to URI mapping . . . . . . . . . . . . . . . . . . . . 5
6. Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
7. Security & Privacy Considerations . . . . . . . . . . . . . . . 5
8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 6
9. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 6
10. References . . . . . . . . . . . . . . . . . . . . . . . . . . 6
10.1. Normative References . . . . . . . . . . . . . . . . . . . 6
10.2. Informative References . . . . . . . . . . . . . . . . . . 6
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 7
Intellectual Property and Copyright Statements . . . . . . . . . . 8
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1. Introduction
E.164 Number Mapping (ENUM) [1] uses the Domain Name System (DNS) [6]
to refer from E.164 numbers [7] to Uniform Resource Identifiers
(URIs) [3]. Specific services to be used with ENUM must be
registered with IANA. Section 3 of RFC 3761 describes the process of
such an Enumservice registration.
The Extensible Messaging and Presence Protocol (XMPP) [9] provides
means for streaming Extensible Markup Language (XML) [8] elements
between endpoints in close to real time. The XMPP framework is
mainly used to provide instant messaging, presence and streaming
media services.
RFC 4622 [5] registers a Uniform Resource Identifier (URI) scheme for
identifying an XMPP entity as a URI or as an Internationalized
Resource Identifier (IRI) [4]. The Enumservice specified in this
document allows the provisioning of such "xmpp" URIs (and the URI
representations of "xmpp" IRIs) in ENUM.
2. Change Log
[Note to editors: This section is to be removed before publication -
XML source available on request]
draft-ietf-enum-xmpp-02
added acknowledgements (reviewers)
addressing commments from IETF Last Call:
added text about general ENUM and XMPP security considerations to
the respective sections.
changed text of introduction (there is no IRI scheme)
changed example number to Nottingham :)
draft-ietf-enum-xmpp-01
some minor editorial changes to text
changed example record layout
draft-ietf-enum-xmpp-00
accepted as WG item during IETF67
moved sections around (changelog behind intro)
added seperate terminology section
changed Abstract
slightly changed introduction
added text about IRI mapping
draft-mayrhofer-enum-xmpp-00
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initial draft
3. Terminology
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC 2119 [2].
4. ENUM Service Registration - XMPP
The following template contains information required for the IANA
registrations of the 'XMPP' Enumservice, according to Section 3 of
RFC 3761:
Enumservice Name: "XMPP"
Enumservice Type: "xmpp"
Enumservice Subtype: n/a
URI Schemes: "xmpp"
Functional Specification:
This Enumservice indicates that the resource identified is an XMPP
entity.
Security Considerations: see Section 7
Intended Usage: COMMON
Author: Alexander Mayrhofer <mailto:alexander.mayrhofer@enum.at>
5. XMPP IRI/URI considerations for ENUM
5.1. Authority Component
XMPP IRIs/URIs optionally contain an "Authority Component" (see
section 2.3 of RFC 4622). The presence of such an Authority
Component in an IRI/URI signals the processing application to
authenticate as the user indicated in the URI/IRI rather than using
the preconfigured identity.
In the context of this Enumservice, arbitrary clients may discover
and use the XMPP URIs/IRIs associated to an E.164 number, hence in
most cases those clients will not be able to authenticate as
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requested in the Authority Component.
Therefore, URIs/IRIs results from processing an XMPP Enumservice
record SHOULD NOT contain an Authority Component.
5.2. IRI to URI mapping
While XMPP supports IRIs as well as 'plain' URIs, ENUM itself
supports only the use of URIs for Enumservices.
Therefore, XMPP IRIs MUST be mapped to URIs for use in an XMPP
Enumservice record. The mapping MUST follow the procedures outlined
in section 3.1 of RFC 3987.
6. Example
An example ENUM entry referencing to a XMPP URI could look like:
$ORIGIN 6.9.4.0.6.9.4.5.1.1.4.4.e164.arpa.
@ IN NAPTR ( 100 10 "u"
"E2U+xmpp"
"!^.*$!xmpp:some-user@example.com!" .
)
7. Security & Privacy Considerations
General security considerations of the protocols on which this
Enumservice registration is based are addressed in Sections 3.1.3 and
6 of RFC 3761 (ENUM) and Section 14 of RFC 3920 (XMPP).
Since ENUM uses DNS - a publicly available database - any information
contained in records provisioned in ENUM domains must be considered
public as well. Even after revoking the DNS entry and removing the
refered resource, copies of the information could still be available.
Information published in ENUM records could reveal associations
between E.164 numbers and their owners - especially if IRIs/URIs
contain personal identifiers or domain names for which ownership
information can be obtained easily.
However, it is important to note that the ENUM record itself does not
need to contain any personal information. It just points to a
location where access to personal information could be granted.
ENUM records pointing to third party resources can easily be
provisioned on purpose by the ENUM domain owner - so any assumption
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about the association between a number and an entity could therefore
be completely bogus unless some kind of identity verification is in
place. This verification is out of scope for this memo.
8. IANA Considerations
This memo requests IANA to add a new "XMPP" Enumservice to the
'Enumservice Registrations' registry, according to the definitions in
this document and RFC 3761 [1].
The required template is contained in Section 4.
9. Acknowledgements
Some text from RFC 4622 was used in the Introduction section of this
document. Charles Clancy, Miguel Garcia, Andrew Newton, Jon Peterson
and Peter Saint-Andre provided extensive reviews and valueable
feedback.
10. References
10.1. Normative References
[1] Faltstrom, P. and M. Mealling, "The E.164 to Uniform Resource
Identifiers (URI) Dynamic Delegation Discovery System (DDDS)
Application (ENUM)", RFC 3761, April 2004.
[2] Bradner, S., "Key words for use in RFCs to Indicate Requirement
Levels", BCP 14, RFC 2119, March 1997.
[3] Berners-Lee, T., Fielding, R., and L. Masinter, "Uniform
Resource Identifier (URI): Generic Syntax", STD 66, RFC 3986,
January 2005.
[4] Duerst, M. and M. Suignard, "Internationalized Resource
Identifiers (IRIs)", RFC 3987, January 2005.
[5] Saint-Andre, P., "Internationalized Resource Identifiers (IRIs)
and Uniform Resource Identifiers (URIs) for the Extensible
Messaging and Presence Protocol (XMPP)", RFC 4622, August 2006.
10.2. Informative References
[6] Mockapetris, P., "Domain names - Implementation and
Specification", STD 13, RFC 1035, November 1987.
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[7] ITU-T, "The international public telecommunication numbering
plan", Recommendation E.164 (02/05), Feb 2005.
[8] Yergeau, F., Paoli, J., Sperberg-McQueen, C., Bray, T., and E.
Maler, "Extensible Markup Language (XML) 1.0 (Third Edition)",
W3C REC REC-xml-20040204, February 2004.
[9] Saint-Andre, P., Ed., "Extensible Messaging and Presence
Protocol (XMPP): Core", RFC 3920, October 2004.
Author's Address
Alexander Mayrhofer
enum.at GmbH
Karlsplatz 1/9
Wien A-1010
Austria
Phone: +43 1 5056416 34
Email: alexander.mayrhofer@enum.at
URI: http://www.enum.at/
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