Attestation Event Stream Subscription
draft-birkholz-rats-network-device-subscription-00

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Last updated 2020-06-24
Replaces draft-voit-rats-trusted-path-routing
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RATS Working Group                                           H. Birkholz
Internet-Draft                                            Fraunhofer SIT
Intended status: Standards Track                                 E. Voit
Expires: December 26, 2020                                         Cisco
                                                                  W. Pan
                                                                  Huawei
                                                           June 24, 2020

                 Attestation Event Stream Subscription
           draft-birkholz-rats-network-device-subscription-00

Abstract

   This document defines how to subscribe to a stream of attestation
   related Evidence on TPM-based network devices.

Status of This Memo

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   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on December 26, 2020.

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

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Birkholz, et al.        Expires December 26, 2020               [Page 1]
Internet-Draft              RATS Subscription                  June 2020

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
     2.1.  Requirements Notation . . . . . . . . . . . . . . . . . .   3
   3.  Operational Model . . . . . . . . . . . . . . . . . . . . . .   3
     3.1.  Sequence Diagram  . . . . . . . . . . . . . . . . . . . .   3
     3.2.  Continuously Verifying Freshness  . . . . . . . . . . . .   5
       3.2.1.  TPM 1.2 Quote . . . . . . . . . . . . . . . . . . . .   5
       3.2.2.  TPM 2 Quote . . . . . . . . . . . . . . . . . . . . .   5
   4.  Remote Attestation Event Stream . . . . . . . . . . . . . . .   6
     4.1.  Subscription to the <attestation> Event Stream  . . . . .   7
     4.2.  Replaying a history of previous TPM extend operations . .   7
       4.2.1.  TPM2 Heartbeat  . . . . . . . . . . . . . . . . . . .   8
     4.3.  YANG notifications placed on the <attestation> Event
           Stream  . . . . . . . . . . . . . . . . . . . . . . . . .   8
       4.3.1.  tpm-extend  . . . . . . . . . . . . . . . . . . . . .   8
       4.3.2.  tpm12-attestation . . . . . . . . . . . . . . . . . .   9
       4.3.3.  tpm20-attestation . . . . . . . . . . . . . . . . . .  10
     4.4.  Filtering Evidence at the Attester  . . . . . . . . . . .  11
     4.5.  Replaying previous PCR Extend events  . . . . . . . . . .  11
     4.6.  Configuring the <attestation> Event Stream  . . . . . . .  12
   5.  YANG Module . . . . . . . . . . . . . . . . . . . . . . . . .  12
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  18
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  19
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  19
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  19
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  19
   Appendix A.  Acknowledgements . . . . . . . . . . . . . . . . . .  20
     A.1.  Open Questions  . . . . . . . . . . . . . . . . . . . . .  20
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  20

1.  Introduction

   [RATS-Device] and [RATS-YANG] define the operational prerequisites
   and a YANG Model for the acquisition of Evidence from a TPM-based
   network device.  However, there is a limitation inherent in the
   challenge-response interaction models upon which these documents are
   based.  This limitation is that it is up to the Verifier to request
   Evidence.  The result is that the interval between the occurrence of
   a security event, and the event's visibility within the Relying Party
   can be unacceptably long.
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