MSA-to-MDA S/MIME signing & encryption
draft-melnikov-smime-msa-to-mda-00

Network Working Group                                        A. Melnikov
Internet-Draft                                                 Isode Ltd
Intended status: Standards Track                        October 14, 2013
Expires: April 17, 2014

                 MSA-to-MDA S/MIME signing & encryption
                   draft-melnikov-smime-msa-to-mda-00

Abstract

   This document specifies how S/MIME signing and encryption can be
   applied between a Message Submission Agent (MSA) and a Message
   Delivery Agent (MDA) or between 2 Message Transfer Agents (MTA).

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions Used in This Document . . . . . . . . . . . . . .   2
   3.  MSA-to-MDA S/MIME signing & encryption  . . . . . . . . . . .   2
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   2
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   3
   6.  Normative References  . . . . . . . . . . . . . . . . . . . .   3
   Appendix A.  Acknowledgements . . . . . . . . . . . . . . . . . .   3

1.  Introduction

   [RFC3183] specifies Domain Security Services using S/MIME.  The
   motivation provided there remains largely the same.  This document
   specifies a simplified variant of Domain Security Services to be used
   between an MSA/MTA and an MTA/MDA.

2.  Conventions Used in This Document

   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].

3.  MSA-to-MDA S/MIME signing & encryption

   An MSA/MTA wishing to sign or encrypt an email message on bahalf of a
   domain ("originating S/MIME MSA" or "originating S/MIME MTA") follows
   rules specified in [RFC3183], except as specified in this document.

   Originating S/MIME MSA/MTA uses a domain signature as specified in
   [RFC3183].  However the rules below replace naming rules specified in
   Sections 3.1.1 and 4.1 of that document.

   The subject name of the Originating S/MIME MSA/MTA's X.509
   certificate is not restricted as specified in RFC 3183.  In order for
   a verifier to recognize a signing/encrypting certificate as the
   Originating S/MIME MSA/MTA's certificate, it MUST contain
   uniformResourceIdentifier GeneralName of the format "smtp://<fully-
   qualified-domain>" in its SubjectAltName.  (Here <fully-qualified-
   domain> is the domain that is being served by the signing/encrypting
   MSA/MTA.)  An rfc822Name GeneralName as specified in RFC 3183 MAY
   optionally be included in the SubjectAltName.

   [[Do we need to distinguish signing versa encryption in certificate's
   SubjectAltName?]]

4.  IANA Considerations

Melnikov                 Expires April 17, 2014                 [Page 2]
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   This document doesn't require any action from IANA.

5.  Security Considerations

   TBD

6.  Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.

   [RFC3183]  Dean, T. and W. Ottaway, "Domain Security Services using S
              /MIME", RFC 3183, October 2001.

   [RFC5280]  Cooper, D., Santesson, S., Farrell, S., Boeyen, S.,
              Housley, R., and W. Polk, "Internet X.509 Public Key
              Infrastructure Certificate and Certificate Revocation List
              (CRL) Profile", RFC 5280, May 2008.

   [RFC5322]  Resnick, P., Ed., "Internet Message Format", RFC 5322,
              October 2008.

   [RFC5751]  Ramsdell, B. and S. Turner, "Secure/Multipurpose Internet
              Mail Extensions (S/MIME) Version 3.2 Message
              Specification", RFC 5751, January 2010.

Appendix A.  Acknowledgements

   TBD

Author's Address

   Alexey Melnikov
   Isode Ltd
   5 Castle Business Village
   36 Station Road
   Hampton, Middlesex  TW12 2BX
   UK

   EMail: Alexey.Melnikov@isode.com

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