Authenticated Received Chain (ARC) Protocol
draft-ietf-dmarc-arc-protocol-15

Document Type Active Internet-Draft (dmarc WG)
Last updated 2018-06-24
Replaces draft-andersen-arc
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DMARC Working Group                                          K. Andersen
Internet-Draft                                                  LinkedIn
Intended status: Experimental                               B. Long, Ed.
Expires: December 26, 2018                                        Google
                                                           S. Blank, Ed.
                                                                Valimail
                                                       M. Kucherawy, Ed.
                                                                     TDP
                                                         T. Draegon, Ed.
                                                                dmarcian
                                                           June 24, 2018

              Authenticated Received Chain (ARC) Protocol
                    draft-ietf-dmarc-arc-protocol-15

Abstract

   The Authenticated Received Chain (ARC) protocol allows Internet Mail
   Handlers to attach assertions of message authentication state 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 authentication
   state along 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 state 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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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on December 26, 2018.

Andersen, et al.        Expires December 26, 2018               [Page 1]
Internet-Draft                ARC-Protocol                     June 2018

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   4
     1.1.  Note to Reviewers in the DMARC WG . . . . . . . . . . . .   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.  Sealer  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     3.4.  Validator . . . . . . . . . . . . . . . . . . . . . . . .   7
     3.5.  Imported ABNF Tokens  . . . . . . . . . . . . . . . . . .   7
     3.6.  Common ABNF Tokens  . . . . . . . . . . . . . . . . . . .   7
   4.  Protocol Elements . . . . . . . . . . . . . . . . . . . . . .   8
     4.1.  ARC Headers . . . . . . . . . . . . . . . . . . . . . . .   8
       4.1.1.  ARC-Authentication-Results (AAR)  . . . . . . . . . .   8
       4.1.2.  ARC-Message-Signature (AMS) . . . . . . . . . . . . .   8
       4.1.3.  ARC-Seal (AS) . . . . . . . . . . . . . . . . . . . .   9
     4.2.  ARC Set . . . . . . . . . . . . . . . . . . . . . . . . .  10
       4.2.1.  Instance Tags . . . . . . . . . . . . . . . . . . . .  11
     4.3.  Authenticated Received Chain  . . . . . . . . . . . . . .  11
     4.4.  Chain Validation Status . . . . . . . . . . . . . . . . .  11
   5.  Protocol Actions  . . . . . . . . . . . . . . . . . . . . . .  12
     5.1.  Sealer Actions  . . . . . . . . . . . . . . . . . . . . .  12
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