Draft and Release using Internet Email
draft-melnikov-mmhs-authorizing-users-05

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Network Working Group                                        A. Melnikov
Internet-Draft                                                 Isode Ltd
Intended status: Informational                              May 19, 2014
Expires: November 20, 2014

                 Draft and Release using Internet Email
                draft-melnikov-mmhs-authorizing-users-05

Abstract

   This document describes a procedure for when an Military Message
   Handling System (MMHS) message is composed by one user and is only
   released to the mail transfer system when one or more authorizing
   users authorize release of the message by adding the MMHS-
   Authorizing-Users header field.  The resulting message can be
   optionally signed by the sender and/or reviewer, allowing recipients
   to verify both the original signature (if any) and review signatures.

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 http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
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   time.  It is inappropriate to use Internet-Drafts as reference
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   This Internet-Draft will expire on November 20, 2014.

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

Melnikov                Expires November 20, 2014               [Page 1]
Internet-Draft           MMHS Draft and Release                 May 2014

   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions Used in This Document . . . . . . . . . . . . . .   3
   3.  Draft and Release procedure . . . . . . . . . . . . . . . . .   3
     3.1.  Handling of Initial Message Submission by MSA . . . . . .   3
     3.2.  Review by Authorizing User(s) . . . . . . . . . . . . . .   3
       3.2.1.  Processing of Encrypted Messages  . . . . . . . . . .   4
       3.2.2.  Authorizing S/MIME signatures . . . . . . . . . . . .   5
     3.3.  Role of other Messaging Agents  . . . . . . . . . . . . .   5
       3.3.1.  Border MTA at the sender's domain . . . . . . . . . .   5
       3.3.2.  MDA at the sender's domain  . . . . . . . . . . . . .   5
   4.  MMHS-Authorizing-Users header field . . . . . . . . . . . . .   5
   5.  Updated MIXER mapping . . . . . . . . . . . . . . . . . . . .   6
     5.1.  Mapping from RFC 5322/MIME to X.400 . . . . . . . . . . .   6
     5.2.  Mapping from X.400 to RFC 5322/MIME . . . . . . . . . . .   6
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
     7.1.  Forged Header Fields  . . . . . . . . . . . . . . . . . .   7
     7.2.  Intentionally Malformed Header Fields . . . . . . . . . .   8
   8.  Open Issues . . . . . . . . . . . . . . . . . . . . . . . . .   8
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .   8
     9.2.  Informative References  . . . . . . . . . . . . . . . . .   9
   Appendix A.  Acknowledgements . . . . . . . . . . . . . . . . . .  10

1.  Introduction

   In some secure environments email messages can't be released to the
   MTS (Mail Transfer System) and, thus delivered to recipients, unless
   they are authorized by one or more authorizing users (e.g. Releasing
   Officers or Release Authorities).  This document describes how this
   mechanism can be realized by an additional Internet Email [RFC5322]
   header field and optionally protected using S/MIME [RFC5750]
   [RFC5751] or DKIM [RFC6376].

   This document describes a procedure for how an email message composed
   by one user can be released to the MTS when one or more authorizing
   users authorize and optionally countersign the message.  The header
   communicates which users authorized the message.  If signed, the
   resulting message allows recipients to verify both the original (if
   any) and counter S/MIME signatures.  The list of authorizing users is
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