Attestation Event Stream Subscription
draft-birkholz-rats-network-device-subscription-01
RATS Working Group H. Birkholz
Internet-Draft Fraunhofer SIT
Intended status: Standards Track E. Voit
Expires: April 9, 2021 Cisco
W. Pan
Huawei
October 06, 2020
Attestation Event Stream Subscription
draft-birkholz-rats-network-device-subscription-01
Abstract
This document defines how to subscribe to an Event Stream of
attestation related Evidence on TPM-based network devices.
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Birkholz, et al. Expires April 9, 2021 [Page 1]
Internet-Draft RATS Subscription October 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. pcr-extend . . . . . . . . . . . . . . . . . . . . . 8
4.3.2. tpm12-attestation . . . . . . . . . . . . . . . . . . 10
4.3.3. tpm20-attestation . . . . . . . . . . . . . . . . . . 11
4.4. Filtering Evidence at the Attester . . . . . . . . . . . 11
4.5. Replaying previous PCR Extend events . . . . . . . . . . 12
4.6. Configuring the <attestation> Event Stream . . . . . . . 12
5. YANG Module . . . . . . . . . . . . . . . . . . . . . . . . . 13
6. Security Considerations . . . . . . . . . . . . . . . . . . . 19
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 20
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 20
8.1. Normative References . . . . . . . . . . . . . . . . . . 20
8.2. Informative References . . . . . . . . . . . . . . . . . 21
Appendix A. Change Log . . . . . . . . . . . . . . . . . . . . . 21
Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 21
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 21
1. Introduction
[I-D.ietf-rats-tpm-based-network-device-attest] and
[I-D.ietf-rats-yang-tpm-charra] define the operational prerequisites
and a YANG Model for the acquisition of Evidence from a TPM-based
network device. However there is a limitation inherant 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
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