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Network Working Group P. Saint-Andre
Internet-Draft XMPP Standards Foundation
Intended status: Informational November 7, 2007
Expires: May 10, 2008
The IM-ID Header Field
draft-saintandre-header-im-01
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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 an Instant Messaging (IM) URI in
the message header block for the purpose of associating the author
with an instant messaging address.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Syntax . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Implementation . . . . . . . . . . . . . . . . . . . . . . . . 3
3.1. Inclusion . . . . . . . . . . . . . . . . . . . . . . . . . 3
3.2. Generation . . . . . . . . . . . . . . . . . . . . . . . . 3
3.3. Processing . . . . . . . . . . . . . . . . . . . . . . . . 4
3.4. Disposition . . . . . . . . . . . . . . . . . . . . . . . . 4
4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 4
5. Security Considerations . . . . . . . . . . . . . . . . . . . . 4
6. References . . . . . . . . . . . . . . . . . . . . . . . . . . 5
6.1. Normative References . . . . . . . . . . . . . . . . . . . 5
6.2. Informative References . . . . . . . . . . . . . . . . . . 5
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 6
Intellectual Property and Copyright Statements . . . . . . . . . . 7
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1. Introduction
Several technologies enable entities to exchange messages in close to
real time, also known as "instant messaging" or IM [IMP-REQS]. Such
technologies include the Extensible Messaging and Presence Protocol
[XMPP-IM] and the Session Initiation Protocol [SIP-IM]. To
facilitate the exchange of instant messages, a URI scheme for IM is
defined in [CPIM].
Because almost all human users of instant messaging systems also use
email systems and because many such users also use netnews systems,
it can be helpful for such users to specify their IM URIs in the
messages they author. The IM-ID header field provides a standard
location for such information. This document documents the syntax
and implementation of the IM-ID header field, including the
information necessary to register it in the Permanent Message Header
Field Registry maintained by the IANA.
2. Syntax
The syntax of the IM-ID header field is defined below using Augmented
Backus-Naur Form (as specified by [ABNF]), where the "IM-URI" rule is
defined in [CPIM] and the remaining rules are defined in [MESSAGE]:
"IM-ID:" SP *WSP pathxmpp *WSP CRLF
3. Implementation
3.1. Inclusion
The IM-ID header field is associated with the author of the message;
see [MESSAGE]. If the "From:" header field contains more than one
mailbox, the IM-ID header field should not be added to the message.
There should be no more than one instance of the IM-ID header field.
3.2. Generation
For a user whose instant messaging URI is "im:juliet@example.com",
the corresponding IM-ID header field would be:
IM-ID: im:juliet@example.com
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3.3. Processing
Upon receiving a message containing an IM-ID header field, a user
agent that supports the field should process the field by resolving
the instant messaging URI in accordance with the procedures specified
in [CPIM].
3.4. Disposition
A user agent that has processed an IM-ID header field may provide
appropriate interface elements if it has independent information
linking the author of the message with the specified instant
messaging URI (e.g., via a user-controlled address book or automated
directory lookup). Such interface elements might include 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 "IM-ID" header field
in the Permanent Message Header Field Registry. The registration
template is as follows:
Header field name: IM-ID
Applicable protocol: mail, netnews
Status: permanent
Author/Change controller: Peter Saint-Andre
<mailto:stpeter@jabber.org>
Specification document(s): draft-saintandre-header-im-00 [Note to
IANA and RFC Editor: Replace I-D name with RFC XXXX, where "XXXX"
is the number of the RFC that results from this specification, if
any]
Related information: For detail information regarding instant
messaging URIs, refer to RFC 3860.
5. Security Considerations
Message headers are an existing standard and are designed to easily
accommodate new types. Although the IM-ID header field may be
forged, this problem is inherent in Internet email; however, because
a forged IM-ID header field may break automated processing,
applications should not depend on the IM-ID header field to indicate
the authenticity of an email message or the identity of its author or
sender. Including the IM-ID header field among the signer header
fields in DomainKeys Identified Mail (DKIM) can help to mitigate
against forging of the header (see [DKIMSIG]).
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Advertising instant messaging URIs in message headers may make it
easier for malicious users to harvest such URIs and therefore to send
unsolicited bulk communications to the users or applications
represented by those URIs. Care should be taken in balancing the
benefits of open information exchange against the potential costs of
unwanted communication. An user agent that is capable of including
the IM-ID header field in outgoing messages should provide an option
for its user to disable inclusion of the IM-ID header field
generally, on a per-recipient basis, and on a per-message basis.
The security considerations discussed in [URI] and [CPIM] may also
apply to the IM-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.
[CPIM] Peterson, J., "Common Profile for Instant Messaging
(CPIM)", RFC 3860, August 2004.
[MESSAGE] Resnick, P., "Internet Message Format", RFC 2822,
April 2001.
6.2. Informative References
[DKIMSIG] Allman, E., Callas, J., Delany, M., Libbey, M., Fenton,
J., and M. Thomas, "DomainKeys Identified Mail (DKIM)
Signatures", RFC 4871, May 2007.
[IMP-REQS]
Day, M., Aggarwal, S., and J. Vincent, "Instant Messaging
/ Presence Protocol Requirements", RFC 2779,
February 2000.
[REG] Klyne, G., Nottingham, M., and J. Mogul, "Registration
Procedures for Message Header Fields", BCP 90, RFC 3864,
September 2004.
[SIP-IM] Campbell, B., Rosenberg, J., Schulzrinne, H., Huitema, C.,
and D. Gurle, "Session Initiation Protocol (SIP) Extension
for Instant Messaging", RFC 3428, December 2002.
[URI] Berners-Lee, T., Fielding, R., and L. Masinter, "Uniform
Resource Identifier (URI): Generic Syntax", STD 66,
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RFC 3986, January 2005.
[XMPP-IM] Saint-Andre, P., "Extensible Messaging and Presence
Protocol (XMPP): Instant Messaging and Presence",
RFC 3921, October 2004.
Author's Address
Peter Saint-Andre
XMPP Standards Foundation
Email: stpeter@jabber.org
URI: https://stpeter.im/
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