One document matched: draft-saintandre-jabberid-08.txt
Differences from draft-saintandre-jabberid-07.txt
Network Working Group P. Saint-Andre
Internet-Draft XMPP Standards Foundation
Intended status: Informational December 4, 2007
Expires: June 6, 2008
The Jabber-ID Header Field
draft-saintandre-jabberid-08
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Copyright Notice
Copyright (C) The IETF Trust (2007).
Abstract
This document defines a header field that enables the author of an
email or netnews message to include a Jabber Identifier in the
message header block for the purpose of associating the author with a
particular Extensible Messaging and Presence Protocol (XMPP) address.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Syntax . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Implementation . . . . . . . . . . . . . . . . . . . . . . . . 4
3.1. Inclusion . . . . . . . . . . . . . . . . . . . . . . . . . 4
3.2. Generation . . . . . . . . . . . . . . . . . . . . . . . . 4
3.3. Processing . . . . . . . . . . . . . . . . . . . . . . . . 5
3.4. Disposition . . . . . . . . . . . . . . . . . . . . . . . . 5
4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 5
5. Security Considerations . . . . . . . . . . . . . . . . . . . . 5
6. References . . . . . . . . . . . . . . . . . . . . . . . . . . 6
6.1. Normative References . . . . . . . . . . . . . . . . . . . 6
6.2. Informative References . . . . . . . . . . . . . . . . . . 6
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 8
Intellectual Property and Copyright Statements . . . . . . . . . . 9
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1. Introduction
The Extensible Messaging and Presence Protocol (XMPP), documented in
[XMPP-CORE], 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
[XMPP-IM], and XMPP addresses are still referred to as Jabber
Identifiers or Jabber IDs.
Because almost all human users of Jabber/XMPP instant messaging and
presence systems also user email systems (see [MESSAGE]) and because
many such users also use netnews systems (see [NETNEWS]), it can be
helpful for such users to specify their Jabber Identifiers in the
messages they author. The Jabber-ID header field provides a standard
location for that information. Members of the Jabber instant
messaging and presence community have been experimenting with this
usage for several years. As a result, this document provides
informational documentation regarding the syntax and implementation
of the Jabber-ID header field, including the information necessary to
register the Jabber-ID field in the Provisional Message Header Field
Registry maintained by the IANA.
Naturally it may be beneficial to define a more general header field
(or fields) that can be used by non-XMPP instant messaging and
presence systems. In all likelihood the result would be one header
field encapsulating a URI that conforms to the "im:" scheme (see
[CPIM]) and a second header field encapsulating a URI that conforms
to the "pres:" scheme (see [CPP]). Experience gained with the
Jabber-ID header field within the Jabber instant messaging and
presence community should provide helpful input to the process of
defining those more general header fields.
2. Syntax
The syntax of the Jabber-ID header field is defined below using
Augmented Backus-Naur Form (as specified by [ABNF]), where the
"pathxmpp" rule is defined in [XMPP-URI] and the remaining rules are
defined in [MESSAGE]:
"Jabber-ID:" SP *WSP pathxmpp *WSP CRLF
Note: Although a native XMPP address may contain virtually any
[UNICODE] character, the header of an email or netnews message may
contain only printable [US-ASCII] characters (see Section 2 of
[MESSAGE]). Therefore, any characters outside the US-ASCII range in
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an XMPP address must be converted to US-ASCII before inclusion in a
Jabber-ID header field, in accordance with the rules specified in
[XMPP-URI]. In addition, characters allowed in XMPP node identifiers
and XMPP resource identifiers but disallowed by the relevant URI
rules must be percent-encoded in accordance with the rules specified
in [URI]; for details, see [XMPP-URI].
3. Implementation
3.1. Inclusion
The Jabber-ID header field is associated with the author of the
message; see [MESSAGE]. If the "From:" header field of an email
message contains more than one mailbox, the Jabber-ID header field
should not be added to the message. There should be no more than one
instance of the Jabber-ID header field.
3.2. Generation
For a user whose XMPP address is "juliet@example.com", the
corresponding Jabber-ID header field 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 field. 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 [IRI] to represent characters that cannot be
rendered in ASCII-only documents (note also that these characters are
represented in their stringprep canonical form; see [STRINGPREP]).
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 field
syntax, the resulting header field would be:
Jabber-ID:
ji%C5%99i@%C4%8Dechy.example
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3.3. Processing
Upon receiving an email or netnews message containing a Jabber-ID
header field, a user agent that supports the field should process the
field by converting any escaped characters to characters outside the
US-ASCII range in accordance with the rules specified in [XMPP-URI],
thus yielding a Jabber Idenfitier that can be used for native
communication on an XMPP network.
3.4. Disposition
A user agent that has processed a Jabber-ID header field may provide
appropriate interface elements if it has independent information
linking the author of the email or netnews message with the specified
Jabber Identifier (e.g., via a user-controlled address book or
automated directory lookup). Such interface elements might include
an indicator of "presence" (i.e., that the author is online and
available for communication via XMPP) if the user is subscribed to
the presence of the author, and an element that enables the user to
initiate a text chat with the author.
4. IANA Considerations
In accordance with [REG], the IANA registers the "Jabber-ID" header
field in the Provisional Message Header Field Registry. The
registration template is as follows:
Header field name: Jabber-ID
Applicable protocol: mail, netnews
Status: provisional
Author/Change controller: Peter Saint-Andre
<mailto:stpeter@jabber.org>
Specification document(s): draft-saintandre-jabberid-08
Related information: For details regarding the native usage and
format of Jabber Identifiers, see Extensible Messaging and
Presence Protocol (RFC 3920).
[Note to IANA and RFC Editor: If appropriate, replace I-D name with
RFC XXXX, where "XXXX" is the number of the RFC that results from
this specification, if any]
5. Security Considerations
Message headers are an existing standard and are designed to easily
accommodate new types. Although the Jabber-ID header field may be
forged, this problem is inherent in Internet email and netnews;
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however, because a forged Jabber-ID header field may break automated
processing, applications should not depend on the Jabber-ID header
field to indicate the authenticity of an email or netnews message, or
the identity of its author or sender. Including the Jabber-ID header
field among the signer header fields in DomainKeys Identified Mail
(DKIM) can help to mitigate against forging of the header (see
[DKIMSIG]).
Advertising XMPP addresses in email or netnews 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 communication. An email or netnews user agent that is
capable of including the Jabber-ID header field in outgoing email or
netnews messages should provide an option for its user to disable
inclusion of the Jabber-ID header field generally, on a per-recipient
basis, and on a per-message basis.
The security considerations discussed in [IRI], [URI], [XMPP-CORE],
[XMPP-IM], and [XMPP-URI] may also apply to the Jabber-ID message
header.
6. References
6.1. Normative References
[ABNF] Crocker, D. and P. Overell, "Augmented BNF for Syntax
Specifications: ABNF", RFC 4234, October 2005.
[MESSAGE] Resnick, P., "Internet Message Format", RFC 2822,
April 2001.
[NETNEWS] Horton, M. and R. Adams, "Standard for interchange of
USENET messages", RFC 1036, December 1987.
[XMPP-URI]
Saint-Andre, P., "Internationalized Resource Identifiers
(IRIs) and Uniform Resource Identifiers (URIs) for the
Extensible Messaging and Presence Protocol (XMPP)",
draft-saintandre-rfc4622bis-01 (work in progress),
June 2007.
6.2. Informative References
[CPIM] Peterson, J., "Common Profile for Instant Messaging
(CPIM)", RFC 3860, August 2004.
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[CPP] Peterson, J., "Common Profile for Presence (CPP)",
RFC 3859, August 2004.
[DKIMSIG] Allman, E., Callas, J., Delany, M., Libbey, M., Fenton,
J., and M. Thomas, "DomainKeys Identified Mail (DKIM)
Signatures", RFC 4871, May 2007.
[IRI] Duerst, M. and M. Suignard, "Internationalized Resource
Identifiers (IRIs)", RFC 3987, January 2005.
[REG] Klyne, G., Nottingham, M., and J. Mogul, "Registration
Procedures for Message Header Fields", BCP 90, RFC 3864,
September 2004.
[STRINGPREP]
Hoffman, P. and M. Blanchet, "Preparation of
Internationalized Strings ("stringprep")", RFC 3454,
December 2002.
[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/).
[URI] Berners-Lee, T., Fielding, R., and L. Masinter, "Uniform
Resource Identifier (URI): Generic Syntax", STD 66,
RFC 3986, January 2005.
[US-ASCII]
American National Standards Institute, "Coded Character
Set - 7-bit American Standard Code for Information
Interchange", ANSI X3.4, 1986.
[XMPP-CORE]
Saint-Andre, P., "Extensible Messaging and Presence
Protocol (XMPP): Core", RFC 3920, October 2004.
[XMPP-IM] Saint-Andre, P., "Extensible Messaging and Presence
Protocol (XMPP): Instant Messaging and Presence",
RFC 3921, October 2004.
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Author's Address
Peter Saint-Andre
XMPP Standards Foundation
Email: stpeter@jabber.org
URI: https://stpeter.im/
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