Authentication-Results Registration for OpenPGP Signature Verification
draft-ser-authentication-results-openpgp-00

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Independent Submission                                            S. Ser
Internet-Draft                                            March 11, 2019
Intended status: Informational
Expires: September 12, 2019

 Authentication-Results Registration for OpenPGP Signature Verification
              draft-ser-authentication-results-openpgp-00

Abstract

   RFC 7601 specifies the Authentication-Results header field for
   conveying results of message authentication checks.  This document
   defines a new authentication method to be used in the Authentication-
   Results header field for PGP-related signature checks.

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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   This Internet-Draft will expire on September 12, 2019.

Copyright Notice

   Copyright (c) 2019 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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   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  "pgp" Authentication Method . . . . . . . . . . . . . . . . .   2
     2.1.  OpenPGP Results . . . . . . . . . . . . . . . . . . . . .   2
     2.2.  Email Authentication Parameters for OpenPGP . . . . . . .   4
       2.2.1.  body.pgp-fingerprint  . . . . . . . . . . . . . . . .   4
       2.2.2.  body.pgp-user-id  . . . . . . . . . . . . . . . . . .   4
     2.3.  Examples  . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   5.  Normative References  . . . . . . . . . . . . . . . . . . . .   6
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   [RFC7601] specifies the Authentication-Results header field for
   conveying results of message authentication checks.  OpenPGP
   signature verification is sometimes implemented in border message
   transfer agents (for instance some MTAs have their own OpenPGP PKI),
   there is a need to convey signature verification status to Mail User
   Agents (MUAs) and downstream filters.  This document defines a new
   authentication method to be used in the Authentication-Results header
   field for OpenPGP-related signature checks.

2.  "pgp" Authentication Method

   OpenPGP signature verification is represented by the "pgp" method and
   is defined in [RFC4880].

2.1.  OpenPGP Results

   The result values used by OpenPGP [RFC4880] are as follows:

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   +-----------+-------------------------------------------------------+
   | Result    | Meaning                                               |
   | Code      |                                                       |
   +-----------+-------------------------------------------------------+
   | none      | The message was not signed.                           |
   | pass      | The message was signed, the signature or signatures   |
   |           | were acceptable to the verifier, and the signature(s) |
   |           | passed verification tests.                            |
   | fail      | The message was signed and the signature or           |
   |           | signatures were acceptable to the verifier, but they  |
   |           | failed the verification test(s).                      |
   | policy    | The message was signed and signature(s) passed        |
   |           | verification tests, but the signature or signatures   |
   |           | were not acceptable to the verifier.                  |
   | neutral   | The message was signed but the signature or           |
   |           | signatures contained syntax errors or were not        |
   |           | otherwise able to be processed.  This result is also  |
   |           | used for other failures not covered elsewhere in this |