Support of asynchronous Enrollment in BRSKI (BRSKI-AE)
draft-ietf-anima-brski-async-enroll-00

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Last updated 2020-07-10
Replaces draft-fries-anima-brski-async-enroll
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ANIMA WG                                                        S. Fries
Internet-Draft                                              H. Brockhaus
Intended status: Standards Track                                 Siemens
Expires: January 11, 2021                                        E. Lear
                                                           Cisco Systems
                                                           July 10, 2020

         Support of asynchronous Enrollment in BRSKI (BRSKI-AE)
                 draft-ietf-anima-brski-async-enroll-00

Abstract

   This document describes enhancements of bootstrapping a remote secure
   key infrastructure (BRSKI) to also operate in domains featuring no or
   only timely limited connectivity between involved components.  It
   addresses connectivity to backend services supporting enrollment like
   a Public Key Infrastructure (PKI) and also to the connectivity
   between pledge and registrar.  For this it enhances the use of
   authenticated self-contained objects in BRSKI also for request and
   distribution of deployment domain specific device certificates.  The
   defined approach is agnostic regarding the utilized enrollment
   protocol allowing the application of existing and potentially new
   certificate management protocols.

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 January 11, 2021.

Copyright Notice

   Copyright (c) 2020 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Fries, et al.           Expires January 11, 2021                [Page 1]
Internet-Draft                  BRSKI-AE                       July 2020

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   6
   3.  Scope of solution . . . . . . . . . . . . . . . . . . . . . .   7
     3.1.  Supported environment . . . . . . . . . . . . . . . . . .   7
     3.2.  Application Examples  . . . . . . . . . . . . . . . . . .   7
       3.2.1.  Rolling stock . . . . . . . . . . . . . . . . . . . .   7
       3.2.2.  Building automation . . . . . . . . . . . . . . . . .   8
       3.2.3.  Substation automation . . . . . . . . . . . . . . . .   8
       3.2.4.  Electric vehicle charging infrastructure  . . . . . .   8
       3.2.5.  Infrastructure isolation policy . . . . . . . . . . .   9
       3.2.6.  Less operational security in the deployment domain  .   9
   4.  Requirement discussion and mapping to solution elements . . .   9
   5.  Architectural Overview and Communication Exchanges  . . . . .  12
     5.1.  Use Case 1: Support of off-site PKI service . . . . . . .  12
       5.1.1.  Behavior of a pledge  . . . . . . . . . . . . . . . .  15
       5.1.2.  Pledge - Registrar discovery and voucher exchange . .  15
       5.1.3.  Registrar - MASA voucher exchange . . . . . . . . . .  16
       5.1.4.  Pledge - Registrar - RA/CA certificate enrollment . .  16
       5.1.5.  Addressing Scheme Enhancements  . . . . . . . . . . .  19
     5.2.  Use Case 2: pledge-agent  . . . . . . . . . . . . . . . .  19
       5.2.1.  Behavior of a pledge  . . . . . . . . . . . . . . . .  23
       5.2.2.  Behavior of a pledge-agent  . . . . . . . . . . . . .  24
       5.2.3.  Registrar discovery . . . . . . . . . . . . . . . . .  24
       5.2.4.  Handling voucher request and certification requests .  24
     5.3.  Discovery of supported enrollment options at domain
           registrar . . . . . . . . . . . . . . . . . . . . . . . .  27
   6.  Example mappings to existing enrollment protocols . . . . . .  28
     6.1.  EST Handling  . . . . . . . . . . . . . . . . . . . . . .  29
     6.2.  Lightweight CMP Handling  . . . . . . . . . . . . . . . .  29
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