Support of asynchronous Enrollment in BRSKI (BRSKI-AE)
draft-ietf-anima-brski-async-enroll-00
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
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This Internet-Draft will expire on January 11, 2021.
Copyright Notice
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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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