MMHS Draft and Release using S/MIME
draft-melnikov-mmhs-authorizing-users-00

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Last updated 2013-07-03
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Network Working Group                                        A. Melnikov
Internet-Draft                                                 Isode Ltd
Intended status: Informational                             July 03, 2013
Expires: January 04, 2014

                  MMHS Draft and Release using S/MIME
                draft-melnikov-mmhs-authorizing-users-00

Abstract

   This document describes a procedure for when an 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 countersigned, allowing recipients to
   verify both the original signature (if any) and countersignatures.

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
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://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."

   This Internet-Draft will expire on January 04, 2014.

Copyright Notice

   Copyright (c) 2013 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Melnikov                Expires January 04, 2014                [Page 1]
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   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.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions Used in This Document . . . . . . . . . . . . . .   2
   3.  Draft and Release procedure . . . . . . . . . . . . . . . . .   3
   4.  MMHS-Authorizing-Users header field . . . . . . . . . . . . .   4
   5.  Updated MIXER mapping . . . . . . . . . . . . . . . . . . . .   4
     5.1.  Mapping from RFC 5322/MIME to X.400 . . . . . . . . . . .   4
     5.2.  Mapping from X.400 to RFC 5322/MIME . . . . . . . . . . .   5
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   8.  Open Issues . . . . . . . . . . . . . . . . . . . . . . . . .   5
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .   6
     9.2.  Informative References  . . . . . . . . . . . . . . . . .   6
   Appendix A.  Acknowledgements . . . . . . . . . . . . . . . . . .   6

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 Releasing Officers.  This document
   describes how this mechanism can be realized by an additional
   [RFC5322] header field and optionally using S/MIME [RFC5750] and
   [RFC5751].

   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
   specified in the MMHS-Authorizing-Users header field Section 4.  The
   original S/MIME signature generated by the sender (if any) should be
   unaffected by additional S/MIME countersignatures.

2.  Conventions Used in This Document

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   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].

   The formal syntax uses the Augmented Backus-Naur Form (ABNF)
   [RFC5234] notation including the core rules defined in Appendix B of
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