The Entity Attestation Token (EAT)
draft-ietf-rats-eat-08
RATS Working Group G. Mandyam
Internet-Draft Qualcomm Technologies Inc.
Intended status: Standards Track L. Lundblade
Expires: August 8, 2021 Security Theory LLC
M. Ballesteros
J. O'Donoghue
Qualcomm Technologies Inc.
February 04, 2021
The Entity Attestation Token (EAT)
draft-ietf-rats-eat-08
Abstract
An Entity Attestation Token (EAT) provides a signed (attested) set of
claims that describe state and characteristics of an entity,
typically a device like a phone or an IoT device. These claims are
used by a relying party to determine how much it wishes to trust the
entity.
An EAT is either a CWT or JWT with some attestation-oriented claims.
To a large degree, all this document does is extend CWT and JWT.
Contributing
TBD
Status of This Memo
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This Internet-Draft will expire on August 8, 2021.
Mandyam, et al. Expires August 8, 2021 [Page 1]
Internet-Draft EAT February 2021
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1. CWT, JWT and UCCS . . . . . . . . . . . . . . . . . . . . 5
1.2. CDDL . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.3. Entity Overview . . . . . . . . . . . . . . . . . . . . . 6
1.4. EAT Operating Models . . . . . . . . . . . . . . . . . . 6
1.5. What is Not Standardized . . . . . . . . . . . . . . . . 8
1.5.1. Transmission Protocol . . . . . . . . . . . . . . . . 8
1.5.2. Signing Scheme . . . . . . . . . . . . . . . . . . . 8
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 9
3. The Claims . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.1. Token ID Claim (cti and jti) . . . . . . . . . . . . . . 10
3.2. Timestamp claim (iat) . . . . . . . . . . . . . . . . . . 10
3.3. Nonce Claim (nonce) . . . . . . . . . . . . . . . . . . . 10
3.3.1. nonce CDDL . . . . . . . . . . . . . . . . . . . . . 11
3.4. Universal Entity ID Claim (ueid) . . . . . . . . . . . . 11
3.4.1. ueid CDDL . . . . . . . . . . . . . . . . . . . . . . 13
3.5. Origination Claim (origination) . . . . . . . . . . . . . 13
3.5.1. origination CDDL . . . . . . . . . . . . . . . . . . 14
3.6. OEM Identification by IEEE (oemid) . . . . . . . . . . . 14
3.6.1. oemid CDDL . . . . . . . . . . . . . . . . . . . . . 14
3.7. Hardware Version Claims (hardware-version-claims) . . . . 14
3.8. Software Description and Version . . . . . . . . . . . . 16
3.9. The Security Level Claim (security-level) . . . . . . . . 16
3.9.1. security-level CDDL . . . . . . . . . . . . . . . . . 17
3.10. Secure Boot Claim (secure-boot) . . . . . . . . . . . . . 17
3.10.1. secure-boot CDDL . . . . . . . . . . . . . . . . . . 18
3.11. Debug Status Claim (debug-status) . . . . . . . . . . . . 18
3.11.1. Enabled . . . . . . . . . . . . . . . . . . . . . . 19
3.11.2. Disabled . . . . . . . . . . . . . . . . . . . . . . 19
3.11.3. Disabled Since Boot . . . . . . . . . . . . . . . . 19
3.11.4. Disabled Permanently . . . . . . . . . . . . . . . . 19
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