The Entity Attestation Token (EAT)
draft-ietf-rats-eat-04
RATS Working Group G. Mandyam
Internet-Draft Qualcomm Technologies Inc.
Intended status: Standards Track L. Lundblade
Expires: March 4, 2021 Security Theory LLC
M. Ballesteros
J. O'Donoghue
Qualcomm Technologies Inc.
August 31, 2020
The Entity Attestation Token (EAT)
draft-ietf-rats-eat-04
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 March 4, 2021.
Mandyam, et al. Expires March 4, 2021 [Page 1]
Internet-Draft EAT August 2020
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1. CDDL, CWT and JWT . . . . . . . . . . . . . . . . . . . . 4
1.2. Entity Overview . . . . . . . . . . . . . . . . . . . . . 5
1.3. EAT Operating Models . . . . . . . . . . . . . . . . . . 5
1.4. What is Not Standardized . . . . . . . . . . . . . . . . 6
1.4.1. Transmission Protocol . . . . . . . . . . . . . . . . 6
1.4.2. Signing Scheme . . . . . . . . . . . . . . . . . . . 7
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 7
3. The Claims . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.1. Token ID Claim (cti and jti) . . . . . . . . . . . . . . 8
3.2. Timestamp claim (iat) . . . . . . . . . . . . . . . . . . 9
3.3. Nonce Claim (nonce) . . . . . . . . . . . . . . . . . . . 9
3.3.1. nonce CDDL . . . . . . . . . . . . . . . . . . . . . 9
3.4. Universal Entity ID Claim (ueid) . . . . . . . . . . . . 9
3.4.1. ueid CDDL . . . . . . . . . . . . . . . . . . . . . . 12
3.5. Origination Claim (origination) . . . . . . . . . . . . . 12
3.5.1. origination CDDL . . . . . . . . . . . . . . . . . . 12
3.6. OEM Identification by IEEE (oemid) . . . . . . . . . . . 12
3.6.1. oemid CDDL . . . . . . . . . . . . . . . . . . . . . 13
3.7. The Security Level Claim (security-level) . . . . . . . . 13
3.7.1. security-level CDDL . . . . . . . . . . . . . . . . . 14
3.8. Secure Boot and Debug Enable State Claims (boot-state) . 14
3.8.1. Secure Boot Enabled . . . . . . . . . . . . . . . . . 14
3.8.2. Debug Disabled . . . . . . . . . . . . . . . . . . . 15
3.8.3. Debug Disabled Since Boot . . . . . . . . . . . . . . 15
3.8.4. Debug Permanent Disable . . . . . . . . . . . . . . . 15
3.8.5. Debug Full Permanent Disable . . . . . . . . . . . . 15
3.8.6. boot-state CDDL . . . . . . . . . . . . . . . . . . . 15
3.9. The Location Claim (location) . . . . . . . . . . . . . . 15
3.9.1. location CDDL . . . . . . . . . . . . . . . . . . . . 16
3.10. The Age Claim (age) . . . . . . . . . . . . . . . . . . . 16
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