5 captures

09 Mar 2006 - 30 Dec 2006

Feb	MAR	Apr
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2005	2006	2007

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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.

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This Internet-Draft will expire on August 20, 2006.

Copyright Notice

Copyright © The Internet Society (2006).

Abstract

This document defines an electronic mail header that enables a sender to include a Jabber Identifier in the header block of an email message for the purpose of associating the email message or sender with a particular address on an Extensible Messaging and Presence Protocol (XMPP) network.

Table of Contents

1.  Introduction
2.  Jabber-ID Syntax
3.  Examples
4.  Security Considerations
5.  Normative References
§  Author's Address
§  Intellectual Property and Copyright Statements

1. Introduction

The Extensible Messaging and Presence Protocol (XMPP), documented in [RFC3920] (Saint-Andre, P., “Extensible Messaging and Presence Protocol (XMPP): Core,” October 2004.), is a streaming XML technology that enables any two entities on a network to exchange well-defined but extensible XML elements (called "XML stanzas") in close to real time. Given XMPP's heritage in the Jabber open-source community, one of the primary uses for XMPP is instant messaging and presence as documented in [RFC3921] (Saint-Andre, P., “Extensible Messaging and Presence Protocol (XMPP): Instant Messaging and Presence,” October 2004.), and XMPP addresses are still referred to as Jabber Identifiers.

Because almost all users of Jabber instant messaging and presence systems are users of email systems, it would be helpful for such users to specify their Jabber Identifiers in the email messages they send. The Jabber-ID header defined in this document provides a standard location for that information.

The capitalized 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 [RFC2119] (Bradner, S., “Key words for use in RFCs to Indicate Requirement Levels,” March 1997.).

2. Jabber-ID Syntax

The syntax of the Jabber-ID header is defined below using Augmented Backus-Naur Form (as specified by [RFC4234] (Crocker, D. and P. Overell, “Augmented BNF for Syntax Specifications: ABNF,” October 2005.)), where the "pathxmpp" rule is defined in [XMPP-URI] (Saint-Andre, P., “Internationalized Resource Identifiers (IRIs) and Uniform Resource Identifiers (URIs) for the Extensible Messaging and Presence Protocol (XMPP),” December 2005.) and CRLF is defined in [RFC2822] (Resnick, P., “Internet Message Format,” April 2001.):

"Jabber-ID: " pathxmpp CRLF

Although a native XMPP address may contain virtually any [UNICODE] (The Unicode Consortium, “The Unicode Standard, Version 3.2.0,” 2000.) character, an electronic mail header may contain only printable [US-ASCII] (American National Standards Institute, “Coded Character Set - 7-bit American Standard Code for Information Interchange,” 1986.) characters (see Section 2 of [RFC2822] (Resnick, P., “Internet Message Format,” April 2001.)). Therefore, any non-US-ASCII characters in an XMPP address MUST be converted to US-ASCII before inclusion in a Jabber-ID header, in accordance with the rules specified in [XMPP-URI] (Saint-Andre, P., “Internationalized Resource Identifiers (IRIs) and Uniform Resource Identifiers (URIs) for the Extensible Messaging and Presence Protocol (XMPP),” December 2005.).

3. Examples

For a user whose XMPP address is "juliet@example.com", the corresponding Jabber-ID header would be:

Jabber-ID: juliet@example.com

As noted, non-US-ASCII characters in XMPP addresses must be converted into US-ASCII before inclusion in a Jabber-ID header. Consider the following XMPP address:

jiři@čechy.example

(Note: The string "ř" stands for the Unicode character LATIN SMALL LETTER R WITH CARON and the string "č" stands for the Unicode character LATIN SMALL LETTER C WITH CARON, following the "XML Notation" used in [RFC3987] (Duerst, M. and M. Suignard, “Internationalized Resource Identifiers (IRIs),” January 2005.) to represent characters that cannot be rendered in ASCII-only documents (note also that these characters are represented in their stringprep canonical form). For those who do not read Czech, this example could be Anglicized as "george@czech-lands.example".)

Following the rules in [XMPP-URI] (Saint-Andre, P., “Internationalized Resource Identifiers (IRIs) and Uniform Resource Identifiers (URIs) for the Extensible Messaging and Presence Protocol (XMPP),” December 2005.) and the Jabber-ID header syntax, the resulting header would be:

Jabber-id: ji%C5%99i@%C4%8Dechy.example

4. Security Considerations

Message headers are an existing standard and are designed to easily accommodate new types. Although the Jabber-ID header may be forged, this problem is inherent in Internet email. A forged Jabber-ID header may break automated processing; therefore the Jabber-ID header SHOULD NOT be depended upon to indicate the authenticity of the message or the identity of the sender.

Advertising XMPP addresses in email headers may make it easier for malicious users to harvest XMPP addresses and therefore to send unsolicited bulk communications to the users or applications represented by those addresses. Care should be taken in balancing the benefits of open information exchange against the potential costs of unwanted communications.

5. Normative References

Author's Address

Intellectual Property Statement

The IETF takes no position regarding the validity or scope of any Intellectual Property Rights or other rights that might be claimed to pertain to the implementation or use of the technology described in this document or the extent to which any license under such rights might or might not be available; nor does it represent that it has made any independent effort to identify any such rights. Information on the procedures with respect to rights in RFC documents can be found in BCP 78 and BCP 79.

Copies of IPR disclosures made to the IETF Secretariat and any assurances of licenses to be made available, or the result of an attempt made to obtain a general license or permission for the use of such proprietary rights by implementers or users of this specification can be obtained from the IETF on-line IPR repository at http://www.ietf.org/ipr.

The IETF invites any interested party to bring to its attention any copyrights, patents or patent applications, or other proprietary rights that may cover technology that may be required to implement this standard. Please address the information to the IETF at ietf-ipr@ietf.org.

Disclaimer of Validity

This document and the information contained herein are provided on an “AS IS” basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY AND THE INTERNET ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

Copyright Statement

Copyright © The Internet Society (2006). 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.

Acknowledgment

Funding for the RFC Editor function is currently provided by the Internet Society.