Remote Attestation Architecture
draft-thaler-rats-architecture-01

• Status
• IESG evaluation record
• IESG writeups
• Email expansions
• History

• Versions
• 00
• 01

Network Working Group                                          D. Thaler
Internet-Draft                                                 Microsoft
Intended status: Informational                         November 04, 2019
Expires: May 7, 2020

                    Remote Attestation Architecture
                   draft-thaler-rats-architecture-01

Abstract

   In network protocol exchanges, it is often the case that one entity
   (a relying party) requires evidence about the remote peer (and system
   components [RFC4949] thereof), in order to assess the trustworthiness
   of the peer.  This document describes an architecture for such remote
   attestation procedures (RATS), which enable relying parties to decide
   whether to consider a remote system component trustworthy or not.

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
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   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 7, 2020.

Copyright Notice

   Copyright (c) 2019 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
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of

Thaler                     Expires May 7, 2020                  [Page 1]
Internet-Draft       Remote Attestation Architecture       November 2019

   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Use Cases . . . . . . . . . . . . . . . . . . . . . . . . . .   4
     3.1.  Network Endpoint Assessment . . . . . . . . . . . . . . .   4
     3.2.  Confidential Machine Learning (ML) Model Protection . . .   5
     3.3.  Confidential Data Retrieval . . . . . . . . . . . . . . .   5
     3.4.  Critical Infrastructure Control . . . . . . . . . . . . .   5
     3.5.  Trusted Execution Environment (TEE) Provisioning  . . . .   6
     3.6.  Hardware Watchdog . . . . . . . . . . . . . . . . . . . .   6
   4.  Serialization Formats . . . . . . . . . . . . . . . . . . . .   7
   5.  Architectural Models  . . . . . . . . . . . . . . . . . . . .   8
     5.1.  Passport Model  . . . . . . . . . . . . . . . . . . . . .   8
     5.2.  Background-Check Model  . . . . . . . . . . . . . . . . .   9
       5.2.1.  Variation: Verifying Relying Party  . . . . . . . . .  10
       5.2.2.  Variation: Out-of-Band Evidence Conveyance  . . . . .  10
     5.3.  Combinations  . . . . . . . . . . . . . . . . . . . . . .  11
   6.  Trust Model . . . . . . . . . . . . . . . . . . . . . . . . .  12
   7.  Conceptual Messages . . . . . . . . . . . . . . . . . . . . .  12
     7.1.  Evidence  . . . . . . . . . . . . . . . . . . . . . . . .  12
     7.2.  Endorsements  . . . . . . . . . . . . . . . . . . . . . .  13
     7.3.  Attestation Results . . . . . . . . . . . . . . . . . . .  13
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .  14
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  14
   10. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  14
   11. Informative References  . . . . . . . . . . . . . . . . . . .  14
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  15

1.  Introduction

   In network protocol exchanges, it is often the case that one entity
   (a relying party) requires evidence about the remote peer (and system
   components [RFC4949] thereof), in order to assess the trustworthiness
   of the peer.  Remote attestation procedures (RATS) enable relying
   parties to establish a level of confidence in the trustworthiness of
   remote system components through the creation of attestation evidence
   by remote system components and a processing chain towards the
   relying party.  A relying party can then decide whether to consider a
   remote system component trustworthy or not.

   To improve the confidence in a system component's trustworthiness, a
   relying party may require evidence about: