ACME End User Client and Code Signing Certificates
draft-moriarty-acme-client-01

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IETF                                                         K. Moriarty
Internet-Draft                                                  Dell EMC
Intended status: Standards Track                            May 30, 2019
Expires: December 1, 2019

           ACME End User Client and Code Signing Certificates
                     draft-moriarty-acme-client-01

Abstract

   Automated Certificate Management Environment (ACME) core protocol
   addresses the use case of web server certificates for TLS.  This
   document extends the ACME protocol to support end user client, device
   client, and code signing certificates.

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
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   This Internet-Draft will expire on December 1, 2019.

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   Copyright (c) 2019 IETF Trust and the persons identified as the
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Identity Proofing for Client Certificates . . . . . . . . . .   2
   3.  Device Certificates . . . . . . . . . . . . . . . . . . . . .   4
   4.  End User Client Certificates  . . . . . . . . . . . . . . . .   5
   5.  CodeSigning Certificates  . . . . . . . . . . . . . . . . . .   6
   6.  Pre-authorization . . . . . . . . . . . . . . . . . . . . . .   9
   7.  Challenge Types . . . . . . . . . . . . . . . . . . . . . . .   9
     7.1.  One Time Password (OTP) . . . . . . . . . . . . . . . . .  10
     7.2.  Certificate . . . . . . . . . . . . . . . . . . . . . . .  10
     7.3.  FIDO or Public/Private Key Pairs  . . . . . . . . . . . .  11
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .  12
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  12
   10. Contributors  . . . . . . . . . . . . . . . . . . . . . . . .  12
   11. References  . . . . . . . . . . . . . . . . . . . . . . . . .  12
     11.1.  Normative References . . . . . . . . . . . . . . . . . .  12
     11.2.  Informative References . . . . . . . . . . . . . . . . .  12
     11.3.  URL References . . . . . . . . . . . . . . . . . . . . .  12
   Appendix A.  Change Log . . . . . . . . . . . . . . . . . . . . .  14
   Appendix B.  Open Issues  . . . . . . . . . . . . . . . . . . . .  14
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  14

1.  Introduction

   ACME [RFC8555] 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.

   The core ACME protocol defined challenge types specific to web server
   certificates with the possibility to create extensions, or additional
   challenge types for other use cases and certificate types.  Client
   certificates, such as end user and Code SIgning may also benefit from
   automated management to ease the deployment and maintenance of these
   certificates type, thus the definition of this extension defining
   challenge types specific to that usage.

2.  Identity Proofing for Client Certificates

   As with the TLS certificates defined in the core ACME document,
   identity proofing for ACME issued end user client, device client, and
   code signing certificates was not covered in RFC8555.

   Identity proofing for these certificate types present some challenges
   for process automation.  NIST SP 800-63 r3 [NIST800-63r3] serves as
   guidance for identity proofing further detailed in NIST SP 800-63A
   [NIST800-63A] that may occur prior to the ability to automate

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