A Property Types Registry for the Authentication-Results Header Field
RFC 7410

• Status
• IESG evaluation record
• IESG writeups
• Email expansions
• History

• Versions
• 00
• 01
• 02
• 03
• 04

Internet Engineering Task Force (IETF)                      M. Kucherawy
Request for Comments: 7410                                 December 2014
Updates: 7001
Category: Standards Track
ISSN: 2070-1721

 A Property Types Registry for the Authentication-Results Header Field

Abstract

   This document updates RFC 7001 by creating a registry for property
   types in the Authentication-Results header field, used in email
   authentication work, rather than limiting participants to using the
   original, small set of fixed values.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc7410.

Copyright Notice

   Copyright (c) 2014 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Kucherawy                    Standards Track                    [Page 1]
RFC 7410          Authentication-Results Property Types    December 2014

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Updated "ptype" Definition  . . . . . . . . . . . . . . . . .   2
   3.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   3
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   5.  Normative References  . . . . . . . . . . . . . . . . . . . .   5
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .   5
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   5

1.  Introduction

   [RFC7001] defines the email Authentication-Results header field that
   presents the results of an authentication effort in a machine-
   readable format.  The header field creates a place to collect the
   output from authentication processes that are disjoint from later
   processes that might use the output, such as analysis, filtering, or
   sorting mechanisms.

   The specification in that document enumerated a small set of types of
   properties that can be reported using this mechanism.  There has
   emerged a desire to report types of properties about a message
   through this mechanism.  Accordingly, this document updates the
   specification to allow for additional property types ("ptypes")
   beyond the original set and creates a registry where new ones can be
   listed and their defining documents referenced.

2.  Updated "ptype" Definition

   Advanced Backus Naur Form (ABNF) is defined in [RFC5234].

   The ABNF in Section 2.2 of [RFC7001] is updated as follows:

       ptype = Keyword
             ; indicates whether the property being evaluated was
             ; a parameter to an [SMTP] command, was a value taken
             ; from a message header field, was some property of
             ; the message body, or was some other property evaluated by
             ; the receiving Message Transfer Agent (MTA)

   The ABNF token "Keyword" is defined in Section 4.1.2 of [RFC5321].

Kucherawy                    Standards Track                    [Page 2]
RFC 7410          Authentication-Results Property Types    December 2014

   Legal values of "ptype" are as defined in the IANA "Email
   Authentication Property Types" registry (see Section 3).  The initial
   values are as follows, matching those defined in [RFC7001]:

   body:  Indicates information that was extracted from the body of the
      message.  This might be an arbitrary string of bytes, a hash of a
      string of bytes, a Uniform Resource Identifier, or some other
      content of interest.

   header:  Indicates information that was extracted from the header of
      the message.  This might be the value of a header field or some
      portion of a header field.

   policy:  A local policy mechanism was applied that augments or
      overrides the result returned by the authentication mechanism.
      See Section 2.3 of [RFC7001].

   smtp:  Indicates information that was extracted from an SMTP command
      that was used to relay the message.