Extensions to Automatic Certificate Management Environment for end user S/MIME certificates
draft-ietf-acme-email-smime-00

Document Type Active Internet-Draft (acme WG)
Last updated 2017-06-22 (latest revision 2017-06-19)
Replaces draft-melnikov-acme-email-smime
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Network Working Group                                        A. Melnikov
Internet-Draft                                                 Isode Ltd
Intended status: Informational                             June 18, 2017
Expires: December 20, 2017

Extensions to Automatic Certificate Management Environment for end user
                          S/MIME certificates
                     draft-ietf-acme-email-smime-00

Abstract

   This document specifies identifiers and challenges required to enable
   the Automated Certificate Management Environment (ACME) to issue
   certificates for use for email recipients that want to use S/MIME.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

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   Task Force (IETF).  Note that other groups may also distribute
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   This Internet-Draft will expire on December 20, 2017.

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   document authors.  All rights reserved.

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Melnikov                Expires December 20, 2017               [Page 1]
Internet-Draft               ACME for S/MIME                   June 2017

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions Used in This Document . . . . . . . . . . . . . .   2
   3.  Use of ACME for issuing end user S/MIME certificates  . . . .   2
   4.  Open Issues . . . . . . . . . . . . . . . . . . . . . . . . .   3
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   3
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   3
   7.  Normative References  . . . . . . . . . . . . . . . . . . . .   3
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   4

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 an extension to ACME for use by S/MIME.
   Section 3 defines extensions for issuing end user S/MIME [RFC5751]
   certificates.

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 issuing end user S/MIME certificates

   [I-D.ietf-acme-acme] defines "dns" Identifier Type that is used to
   verify that a particular entity has control over a domain or specific
   service associated with the domain.  In order to be able to issue
   end-user S/MIME certificates, ACME needs a new Identifier Type that
   proves ownership of an email address.

   This document defines a new Identifier Type "email" which corresponds
   to an (all ASCII) email address [RFC5321].  This can be used with
   S/MIME or other similar service that requires posession of a
   certificate tied to an email address.

   A new challenge type "email-reply-00" is used with "email" Identifier
   Type, which provides proof that an ACME client has control over an
   email address: [[Very rough outline follows]]

   1.  ACME server generates an email message with the subject
       containing "ACME <token-part1>", where <token-part1> is the
       base64url encoded first part of the token, which contains at

Melnikov                Expires December 20, 2017               [Page 2]
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