Time-Based Uni-Directional Attestation
draft-birkholz-rats-tuda-02
RATS Working Group A. Fuchs
Internet-Draft H. Birkholz
Intended status: Standards Track Fraunhofer SIT
Expires: September 10, 2020 I. McDonald
High North Inc
C. Bormann
Universitaet Bremen TZI
March 09, 2020
Time-Based Uni-Directional Attestation
draft-birkholz-rats-tuda-02
Abstract
This documents defines the method and bindings used to conduct Time-
based Uni-Directional Attestation (TUDA) between two RATS (Remote
ATtestation procedureS) Principals over the Internet. TUDA does not
require a challenge-response handshake and thereby does not rely on
the conveyance of a nonce to prove freshness of remote attestation
Evidence. Conversely, TUDA enables the creation of Secure Audit Logs
that can constitute Evidence about current and past operational
states of an Attester. As a prerequisite for TUDA, every RATS
Principal requires access to a trusted and synchronized time-source.
Per default, in TUDA this is a Time Stamp Authority (TSA) issuing
signed Time Stamp Tokens (TST).
Status of This Memo
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This Internet-Draft will expire on September 10, 2020.
Fuchs, et al. Expires September 10, 2020 [Page 1]
Internet-Draft TUDA March 2020
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Requirements Notation . . . . . . . . . . . . . . . . . . 4
1.2. Evidence . . . . . . . . . . . . . . . . . . . . . . . . 4
1.3. Creating Evidence about Software Component Integrity . . 5
1.3.1. Data Items . . . . . . . . . . . . . . . . . . . . . 5
1.3.2. System Components . . . . . . . . . . . . . . . . . . 5
1.3.3. Operations . . . . . . . . . . . . . . . . . . . . . 6
1.4. Remote Attestation Principles . . . . . . . . . . . . . . 6
1.5. System Component Requirements . . . . . . . . . . . . . . 7
1.6. Evidence Appraisal . . . . . . . . . . . . . . . . . . . 7
1.7. Activities and Actions . . . . . . . . . . . . . . . . . 8
1.8. Attestation and Verification . . . . . . . . . . . . . . 8
1.9. Information Elements and Conveyance . . . . . . . . . . . 8
1.10. TUDA Objectives . . . . . . . . . . . . . . . . . . . . . 9
1.11. Hardware Dependencies . . . . . . . . . . . . . . . . . . 10
2. TUDA Core Concept . . . . . . . . . . . . . . . . . . . . . . 10
3. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.1. Universal Terms . . . . . . . . . . . . . . . . . . . . . 11
3.2. Roles . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.2.1. General Types . . . . . . . . . . . . . . . . . . . . 13
3.2.2. RoT specific terms . . . . . . . . . . . . . . . . . 13
3.3. Certificates . . . . . . . . . . . . . . . . . . . . . . 13
4. Time-Based Uni-Directional Attestation . . . . . . . . . . . 13
4.1. TUDA Information Elements Update Cycles . . . . . . . . . 15
5. Sync Base Protocol . . . . . . . . . . . . . . . . . . . . . 17
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 18
7. Security Considerations . . . . . . . . . . . . . . . . . . . 18
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