ENUM -- Telephone Number Mapping A. MayrhoferNetwork Working Group A. Mayrhofer Request for Comments: 4979 enum.atExpires: November 5,Category: Standards Track August 2007 IANA Registration for Enumservice 'XMPP'draft-ietf-enum-xmpp-02Status ofthisThis MemoBy 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 ofThis document specifies an Internet standards track protocol for the InternetEngineering Task Force (IETF), its areas,community, andits working groups. Note that other groups may also distribute working documents as Internet- Drafts. Internet-Drafts are draft documents validrequests discussion and suggestions fora maximumimprovements. Please refer to the current edition ofsix monthsthe "Internet Official Protocol Standards" (STD 1) for the standardization state andmay 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 liststatus ofcurrent Internet-Drafts can be accessed at http://www.ietf.org/ietf/1id-abstracts.txt. The listthis protocol. Distribution ofInternet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html. This Internet-Draft will expire on November 5, 2007.this memo is unlimited. 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). Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . .32 2.Change Log . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3.Terminology . . . . . . . . . . . . . . . . . . . . . . . . . .4 4. ENUM Service2 3. Enumservice Registration - XMPP . . . . . . . . . . . . . . .4 5.. 2 4. XMPP IRI/URI considerations for ENUM . . . . . . . . . . . . .4 5.1.3 4.1. Authority Component . . . . . . . . . . . . . . . . . . . .4 5.2. IRI to URI3 4.2. IRI-to-URI mapping . . . . . . . . . . . . . . . . . . . .5 6.3 5. Example . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 7.3 6. Security&and Privacy Considerations . . . . . . . . . . . . . .. 5 8.4 7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . .6 9.4 8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . .6 10.4 9. References . . . . . . . . . . . . . . . . . . . . . . . . . .6 10.1.5 9.1. Normative References . . . . . . . . . . . . . . . . . . .6 10.2.5 9.2. Informative References . . . . . . . . . . . . . . . . . .6 Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 7 Intellectual Property and Copyright Statements . . . . . . . . . . 85 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,presencepresence, 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 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 Service3. Enumservice 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 Section76 Intended Usage: COMMON Author: Alexander Mayrhofer<mailto:alexander.mayrhofer@enum.at> 5.<alexander.mayrhofer@enum.at> 4. XMPP IRI/URI considerations for ENUM5.1.4.1. Authority Component XMPP IRIs/URIs optionally contain an "Authority Component" (seesectionSection 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.164number, hencenumber. Hence, in mostcasescases, those clients will not be able to authenticate as requested in the Authority Component. Therefore, URIs/IRIsresultsthat result from processing an XMPP Enumservice record SHOULD NOT contain an Authority Component.5.2. IRI to URI4.2. 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 insectionSection 3.1 of RFC 3987.6.5. 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!" . )7.6. Security&and 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 thereferedreferred 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 tothird partythird-party resources can easily be provisioned on purpose by the ENUM domain owner--- so any assumption 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.8.7. 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 Section4. 9.3. 8. Acknowledgements Some text from RFC 4622 was used in the Introductionsectionof this document. Charles Clancy, Miguel Garcia, Andrew Newton, JonPetersonPeterson, and Peter Saint-Andre provided extensive reviews andvalueablevaluable feedback.10.9. References10.1.9.1. 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,AugustJuly 2006.10.2.9.2. Informative References [6] Mockapetris, P., "Domain names -Implementationimplementation andSpecification",specification", STD 13, RFC 1035, November 1987. [7] ITU-T, "The international public telecommunication numbering plan", Recommendation E.164 (02/05),FebFeb. 2005. [8]Yergeau, F.,Maler, E., Paoli, J.,Sperberg-McQueen, C.,Bray, T., Yergeau, F., andE. Maler,C. Sperberg- McQueen, "Extensible Markup Language (XML) 1.0 (Third Edition)",W3C RECWorld Wide Web Consortium FirstEdition REC-xml-20040204, February2004.2004, <http://www.w3.org/TR/2004/REC-xml-20040204>. [9] Saint-Andre, P., Ed., "Extensible Messaging and Presence Protocol (XMPP): Core", RFC 3920, October 2004. Author's Address Alexander Mayrhofer enum.at GmbH Karlsplatz1/91/2/9 Wien A-1010 Austria Phone: +43 1 5056416 34Email:EMail: alexander.mayrhofer@enum.at URI: http://www.enum.at/ Full Copyright Statement Copyright (C) The IETF Trust (2007). This document is subject to the rights, licenses and restrictions contained in BCP 78, and except as set forth therein, the authors retain all their rights. 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