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SMTP Security via Opportunistic DNS-Based Authentication of Named Entities (DANE) Transport Layer Security (TLS) (RFC7672)

IP.com Disclosure Number: IPCOM000245024D
Original Publication Date: 2015-Oct-01
Included in the Prior Art Database: 2016-Feb-06
Document File: 68 page(s) / 88K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

V. Dukhovni: AUTHOR [+2]

Abstract

This memo specifies a new connection security model for Message Transfer Agents (MTAs). This model is motivated by key features of inter-domain SMTP delivery, principally, the fact that the destination server is selected indirectly via DNS Mail Exchange (MX) records and that neither email addresses nor MX hostnames signal a requirement for either secure or cleartext transport. Therefore, aside from a few manually configured exceptions, SMTP transport security is, by necessity, opportunistic (for a definition of "Opportunistic Security", see [RFC7435]).

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Internet Engineering Task Force (IETF)                       V. Dukhovni Request for Comments: 7672                                     Two Sigma Category: Standards Track                                    W. Hardaker ISSN: 2070-1721                                                  Parsons                                                             October 2015

    SMTP Security via Opportunistic DNS-Based Authentication of Named              Entities (DANE) Transport Layer Security (TLS)

Abstract

   This memo describes a downgrade-resistant protocol for SMTP transport    security between Message Transfer Agents (MTAs), based on the DNS-    Based Authentication of Named Entities (DANE) TLSA DNS record.    Adoption of this protocol enables an incremental transition of the    Internet email backbone to one using encrypted and authenticated    Transport Layer Security (TLS).

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force    (IETF).  It represents the consensus of the IETF community.  It has    received public review and has been approved for publication by the    Internet Engineering Steering Group (IESG).  Further information on    Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,    and how to provide feedback on it may be obtained at    http://www.rfc-editor.org/info/rfc7672.

Copyright Notice

   Copyright (c) 2015 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    the Trust Legal Provisions and are provided without warranty as    described in the Simplified BSD License.

 Dukhovni & Hardaker          Standards Track                    [Page 1]
 RFC 7672        SMTP Security via Opportunistic DANE TLS    October 2015

 Table of Contents

   1. Introduction ....................................................3

      1.1. Terminology ................................................4

      1.2. Background .................................................6

      1.3. SMTP Channel Security ......................................6

           1.3.1...