Extensions to Automatic Certificate Management Environment for email TLS
draft-ietf-acme-email-tls-02

Document Type Active Internet-Draft (acme WG)
Last updated 2017-11-12
Replaces draft-melnikov-acme-email-tls
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Network Working Group                                        A. Melnikov
Internet-Draft                                                 Isode Ltd
Intended status: Informational                         November 11, 2017
Expires: May 15, 2018

Extensions to Automatic Certificate Management Environment for email TLS
                      draft-ietf-acme-email-tls-02

Abstract

   This document specifies identifiers and challenges required to enable
   the Automated Certificate Management Environment (ACME) to issue
   certificates for use by TLS email services.

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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   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 May 15, 2018.

Copyright Notice

   Copyright (c) 2017 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
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   described in the Simplified BSD License.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions Used in This Document . . . . . . . . . . . . . .   2
   3.  Use of ACME for use by TLS-protected SMTP and IMAP services .   2
     3.1.  "service" JWS header parameter  . . . . . . . . . . . . .   3
     3.2.  "port" JWS header parameter . . . . . . . . . . . . . . .   4
     3.3.  DNS challenge for email services  . . . . . . . . . . . .   4
     3.4.  CAPABILITY challenge for email services . . . . . . . . .   4
   4.  Open Issues . . . . . . . . . . . . . . . . . . . . . . . . .   5
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   7.  Normative References  . . . . . . . . . . . . . . . . . . . .   6
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   7

1.  Introduction

   [I-D.ietf-acme-acme] is a mechanism for automating certificate
   management on the Internet.  It enables administrative entities to
   prove effective control over resources like domain names, and
   automates the process of generating and issuing certificates.

   This document describes extensions to ACME for use by email services.
   Section 3 defines extensions for how email services (such as SMTP,
   IMAP) can get certificates for use with TLS.

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.  Use of ACME for use by TLS-protected SMTP and IMAP services

   SMTP [RFC5321] (including SMTP Submission [RFC6409]) and IMAP
   [RFC3501] servers use TLS [RFC5246] to provide server identity
   authentication, data confidentiality and integrity services.  Such
   TLS protected email services either use STARTTLS command or run on a
   separate TLS-protected port .

   [I-D.ietf-acme-acme] defines several challenge types that can be
   extended for use by email services.  This document also defines some
   new challenge types specific to SMTP and IMAP.

   In order to use these challenges JWS [RFC7515] object used by
   [I-D.ietf-acme-acme] is extended.  The following extra requirements
   are in addition to requirements on JWS objects sent in ACME defined
   in Section 6.2 of [I-D.ietf-acme-acme]:

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   1.  "service" JWS header parameter MUST be included.  See Section 3.1
       for more details.

   2.  "port" JWS header parameter SHOULD be included.  See Section 3.2
       for more details.

   For example, if the ACME client were to respond to the "dns-email-00"
   challenge, it would send the following request:
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