Deployable Enhanced Email Privacy (DEEP)
draft-ietf-uta-email-deep-03

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Document Type Active Internet-Draft (uta WG)
Last updated 2016-03-11
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Network Working Group                                           K. Moore
Internet-Draft                                          Network Heretics
Updates: 1939, 2595, 3464, 3501, 5068,                         C. Newman
6186, 6409 (if approved)                                          Oracle
Intended status: Standards Track                          March 11, 2016
Expires: September 12, 2016

                Deployable Enhanced Email Privacy (DEEP)
                    draft-ietf-uta-email-deep-03.txt

Abstract

   This specification defines a set of requirements and facilities
   designed to improve email confidentiality between a mail user agent
   (MUA) and a mail submission or mail access server.  This provides
   mechanisms intended to increase use of already deployed Transport
   Layer Security (TLS) technology, provide a model for mail user
   agent's confidentiality assurance, and enable mail service providers
   to advertise improved TLS confidentiality facilities.

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 September 12, 2016.

Copyright Notice

   Copyright (c) 2016 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

Moore & Newman         Expires September 12, 2016               [Page 1]
Internet-Draft  Deployable Enhanced Email Privacy (DEEP)      March 2016

   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 . . . . . . . . . . . . . . . . . . . . . . . . .  4
   2.  Conventions and Terminology Used in This Document  . . . . . .  4
   3.  Mail Account Confidentiality Assurance Level . . . . . . . . .  5
     3.1.   High Confidentiality Assurance  . . . . . . . . . . . . .  6
     3.2.   No Confidentiality Assurance  . . . . . . . . . . . . . .  6
     3.3.   Other Confidentiality Assurance Levels  . . . . . . . . .  7
   4.  Implicit TLS . . . . . . . . . . . . . . . . . . . . . . . . .  7
     4.1.   Implicit TLS for POP  . . . . . . . . . . . . . . . . . .  7
     4.2.   Implicit TLS for IMAP . . . . . . . . . . . . . . . . . .  7
     4.3.   Implicit TLS for SMTP Submission  . . . . . . . . . . . .  8
     4.4.   Implicit TLS Connection Closure for POP, IMAP and SMTP  .  9
   5.  Email Security Upgrading Using Security Latches  . . . . . . .  9
     5.1.   Email Security Tags . . . . . . . . . . . . . . . . . . . 10
     5.2.   Initial Set of Email Security Tags  . . . . . . . . . . . 10
     5.3.   Server DEEP Status  . . . . . . . . . . . . . . . . . . . 10
     5.4.   Email Security Tag Latch Failures . . . . . . . . . . . . 11
   6.  Recording TLS Cipher Suite in Received Header  . . . . . . . . 11
   7.  Extensions for DEEP Status and Reporting . . . . . . . . . . . 12
     7.1.   IMAP DEEP Extension . . . . . . . . . . . . . . . . . . . 12
     7.2.   POP DEEP Extension  . . . . . . . . . . . . . . . . . . . 14
     7.3.   SMTP DEEP Extension . . . . . . . . . . . . . . . . . . . 15
     7.4.   SMTP Error Extension  . . . . . . . . . . . . . . . . . . 17
   8.  Account Setup Considerations . . . . . . . . . . . . . . . . . 17
     8.1.   Use of SRV records in Establishing Configuration  . . . . 17
     8.2.   Certificate Pinning . . . . . . . . . . . . . . . . . . . 18
   9.  Implementation Requirements  . . . . . . . . . . . . . . . . . 18
     9.1.   All Implementations (Client and Server) . . . . . . . . . 19
       9.1.1.  Client Certificate Authentication  . . . . . . . . . . 19
     9.2.   Mail Server Implementation Requirements . . . . . . . . . 20
     9.3.   Mail User Agent Implementation Requirements . . . . . . . 20
     9.4.   Non-configurable MUAs and nonstandard access protocols  . 21
     9.5.   DEEP Compliance for Anti-Virus/Anti-Spam Software and
            Services  . . . . . . . . . . . . . . . . . . . . . . . . 21
   10. Mail Service Provider Requirements . . . . . . . . . . . . . . 22
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