Authenticated Received Chain (ARC) Protocol
draft-ietf-dmarc-arc-protocol-21

Document Type Active Internet-Draft (dmarc WG)
Last updated 2018-11-16 (latest revision 2018-11-07)
Replaces draft-andersen-arc
Stream IETF
Intended RFC status Experimental
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Reviews
Stream WG state Submitted to IESG for Publication
Document shepherd Tim Wicinski
Shepherd write-up Show (last changed 2018-10-02)
IESG IESG state IESG Evaluation
Consensus Boilerplate Yes
Telechat date On agenda of 2018-11-21 IESG telechat
Has enough positions to pass.
Responsible AD Alexey Melnikov
Send notices to Barry Leiba <barryleiba@computer.org>, Tim Wicinski <tjw.ietf@gmail.com>
IANA IANA review state Version Changed - Review Needed
IANA action state None
DMARC Working Group                                          K. Andersen
Internet-Draft                                                  LinkedIn
Intended status: Experimental                               B. Long, Ed.
Expires: May 11, 2019                                             Google
                                                           S. Blank, Ed.
                                                                Valimail
                                                       M. Kucherawy, Ed.
                                                                     TDP
                                                        November 7, 2018

              Authenticated Received Chain (ARC) Protocol
                    draft-ietf-dmarc-arc-protocol-21

Abstract

   The Authenticated Received Chain (ARC) protocol provides an
   authenticated "chain of custody" for a message, allowing each entity
   that handles the message to see what entities handled it before, and
   to see what the message's authentication assessment was at each step
   in the handling.

   ARC allows Internet Mail Handlers to attach assertions of message
   authentication assessment to individual messages.  As messages
   traverse ARC-enabled Internet Mail Handlers, additional ARC
   assertions can be attached to messages to form ordered sets of ARC
   assertions that represent the authentication assessment at each step
   of message handling paths.

   ARC-enabled Internet Mail Handlers can process sets of ARC assertions
   to inform message disposition decisions, to identify Internet Mail
   Handlers that might break existing authentication mechanisms, and to
   convey original authentication assessments across trust boundaries.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
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   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

Andersen, et al.          Expires May 11, 2019                  [Page 1]
Internet-Draft                ARC-Protocol                 November 2018

   This Internet-Draft will expire on May 11, 2019.

Copyright Notice

   Copyright (c) 2018 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
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   4
   2.  General Concepts  . . . . . . . . . . . . . . . . . . . . . .   5
     2.1.  Evidence  . . . . . . . . . . . . . . . . . . . . . . . .   5
     2.2.  Custody . . . . . . . . . . . . . . . . . . . . . . . . .   5
     2.3.  Chain of Custody  . . . . . . . . . . . . . . . . . . . .   5
     2.4.  Validation of Chain of Custody  . . . . . . . . . . . . .   5
   3.  Terminology and Definitions . . . . . . . . . . . . . . . . .   6
     3.1.  ARC Set . . . . . . . . . . . . . . . . . . . . . . . . .   6
     3.2.  Authenticated Received Chain (ARC)  . . . . . . . . . . .   7
     3.3.  Internet Mail Handlers / Intermediaries . . . . . . . . .   7
     3.4.  Authentication Assessment . . . . . . . . . . . . . . . .   7
     3.5.  Signing vs Sealing  . . . . . . . . . . . . . . . . . . .   7
     3.6.  Sealer  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     3.7.  Validator . . . . . . . . . . . . . . . . . . . . . . . .   8
     3.8.  Imported ABNF Tokens  . . . . . . . . . . . . . . . . . .   8
     3.9.  Common ABNF Tokens  . . . . . . . . . . . . . . . . . . .   8
   4.  Protocol Elements . . . . . . . . . . . . . . . . . . . . . .   8
     4.1.  ARC Header Fields . . . . . . . . . . . . . . . . . . . .   8
       4.1.1.  ARC-Authentication-Results (AAR)  . . . . . . . . . .   9
       4.1.2.  ARC-Message-Signature (AMS) . . . . . . . . . . . . .   9
       4.1.3.  ARC-Seal (AS) . . . . . . . . . . . . . . . . . . . .  10
       4.1.4.  Internationalized Email (EAI) . . . . . . . . . . . .  11
     4.2.  ARC Set . . . . . . . . . . . . . . . . . . . . . . . . .  12
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