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 Status of this Memo By submitting this Internet-Draft, each author represents that any applicable patent or other IPR claims of which he or she is aware have been or will be disclosed, and any of which he or she becomes aware will be disclosed, in accordance with Section 6 of BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF), its areas, and its working groups. Note that other groups may also distribute working documents as Internet- Drafts. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." The list of current Internet-Drafts can be accessed at http://www.ietf.org/ietf/1id-abstracts.txt. The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html. This Internet-Draft will expire on November 5, 2007. Copyright Notice 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). Mayrhofer Expires November 5, 2007 [Page 1] Internet-Draft XMPP Enumservice May 2007 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 Mayrhofer Expires November 5, 2007 [Page 2] Internet-Draft XMPP Enumservice May 2007 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 Mayrhofer Expires November 5, 2007 [Page 3] Internet-Draft XMPP Enumservice May 2007 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 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 Mayrhofer Expires November 5, 2007 [Page 4] Internet-Draft XMPP Enumservice May 2007 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 Mayrhofer Expires November 5, 2007 [Page 5] Internet-Draft XMPP Enumservice May 2007 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. Mayrhofer Expires November 5, 2007 [Page 6] Internet-Draft XMPP Enumservice May 2007 [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/ Mayrhofer Expires November 5, 2007 [Page 7] Internet-Draft XMPP Enumservice May 2007 Full Copyright Statement Copyright (C) The IETF Trust (2007). 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