One document matched: draft-saintandre-jabberid-00.txt
Network Working Group P. Saint-Andre
Internet-Draft JSF
Expires: August 20, 2006 February 16, 2006
The Jabber-ID Email Header
draft-saintandre-jabberid-00
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Copyright Notice
Copyright (C) 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.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Jabber-ID Syntax . . . . . . . . . . . . . . . . . . . . . . . 3
3. Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
4. Security Considerations . . . . . . . . . . . . . . . . . . . 4
5. Normative References . . . . . . . . . . . . . . . . . . . . . 4
Author's Address . . . . . . . . . . . . . . . . . . . . . . . 5
Intellectual Property and Copyright Statements . . . . . . . . 6
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1. Introduction
The Extensible Messaging and Presence Protocol (XMPP), documented in
[RFC3920], 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], 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].
2. Jabber-ID Syntax
The syntax of the Jabber-ID header is defined below using Augmented
Backus-Naur Form (as specified by [RFC4234]), where the "pathxmpp"
rule is defined in [XMPP-URI] and CRLF is defined in [RFC2822]:
"Jabber-ID: " pathxmpp CRLF
Although a native XMPP address may contain virtually any [UNICODE]
character, an electronic mail header may contain only printable [US-
ASCII] characters (see Section 2 of [RFC2822]). 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].
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:
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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] 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] 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
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC2822] Resnick, P., "Internet Message Format", RFC 2822,
April 2001.
[RFC3920] Saint-Andre, P., "Extensible Messaging and Presence
Protocol (XMPP): Core", RFC 3920, October 2004.
[RFC3921] Saint-Andre, P., "Extensible Messaging and Presence
Protocol (XMPP): Instant Messaging and Presence",
RFC 3921, October 2004.
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[RFC3987] Duerst, M. and M. Suignard, "Internationalized Resource
Identifiers (IRIs)", RFC 3987, January 2005.
[RFC4234] Crocker, D. and P. Overell, "Augmented BNF for Syntax
Specifications: ABNF", RFC 4234, October 2005.
[UNICODE] The Unicode Consortium, "The Unicode Standard, Version
3.2.0", 2000.
The Unicode Standard, Version 3.2.0 is defined by The
Unicode Standard, Version 3.0 (Reading, MA, Addison-
Wesley, 2000. ISBN 0-201-61633-5), as amended by the
Unicode Standard Annex #27: Unicode 3.1
(http://www.unicode.org/reports/tr27/) and by the Unicode
Standard Annex #28: Unicode 3.2
(http://www.unicode.org/reports/tr28/).
[US-ASCII]
American National Standards Institute, "Coded Character
Set - 7-bit American Standard Code for Information
Interchange", ANSI X3.4, 1986.
[XMPP-URI]
Saint-Andre, P., "Internationalized Resource Identifiers
(IRIs) and Uniform Resource Identifiers (URIs) for the
Extensible Messaging and Presence Protocol (XMPP)",
draft-saintandre-xmpp-iri-03 (work in progress),
December 2005.
Author's Address
Peter Saint-Andre
Jabber Software Foundation
Email: stpeter@jabber.org
URI: xmpp:stpeter@jabber.org
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