Internet DRAFT - draft-mandyam-rats-qwestoken
draft-mandyam-rats-qwestoken
Rats Working Group G. Mandyam
Internet-Draft V. Sekhar
Intended status: Informational S. Mohammed
Expires: May 3, 2020 Qualcomm Technologies Inc.
October 31, 2019
The Qualcomm Wireless Edge Services (QWES) Attestation Token
draft-mandyam-rats-qwestoken-00
Abstract
An attestation format based on the Entity Attestation Token (EAT) is
described. The Qualcomm Wireless Edge Services (QWES) token is used
in the context of device onboarding and authentication. It is
verified in the same manner as any CBOR Web Token (CWT).
Status of This Memo
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This Internet-Draft will expire on May 3, 2020.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. EAT Compliant Claims in QWES Token . . . . . . . . . . . . . 2
2.1. OEM ID . . . . . . . . . . . . . . . . . . . . . . . . . 2
2.2. nonce . . . . . . . . . . . . . . . . . . . . . . . . . . 2
3. QWES Token Augmentation to EAT . . . . . . . . . . . . . . . 3
3.1. DevID . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3.2. HWVer . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3.3. Context . . . . . . . . . . . . . . . . . . . . . . . . . 3
3.4. PKHash . . . . . . . . . . . . . . . . . . . . . . . . . 3
3.5. SPID . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3.6. QSEEVersion . . . . . . . . . . . . . . . . . . . . . . . 3
3.7. FWVersion . . . . . . . . . . . . . . . . . . . . . . . . 3
3.8. Security State . . . . . . . . . . . . . . . . . . . . . 4
3.9. CSR . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3.10. AppData . . . . . . . . . . . . . . . . . . . . . . . . . 4
4. Example . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 4
6. Normative References . . . . . . . . . . . . . . . . . . . . 5
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 5
1. Introduction
A description of the Qualcomm Wireless Edge Services (QWES)
attestation token is provided. QWES allows for service providers to
manage devices that implement Qualcomm semiconductor solutions.
Based on the EAT-compliant attestation token (see [I-D.ietf-rats-
eat]) produced in a trusted execution environment (TEE), a service
provider can verify the device identity in addition to several other
security-impacting characteristics.
2. EAT Compliant Claims in QWES Token
Certain claims defined for EAT are leveraged in the QWES token.
2.1. OEM ID
The QWES token makes use of an OEM ID. However, the type is a uint
(not a bstr as per the EAT specification).
2.2. nonce
The QWES token can carry a nonce. The nonce is a bstr.
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3. QWES Token Augmentation to EAT
Several claims have been defined that are not currently present in
the EAT base set to complete the QWES token.
3.1. DevID
The DevID is a 256-bit bstr that serves as a device identifier. It
differs from the ueid (Universal Entity ID) defined in the EAT
specificaation. A specific device ID can be created for ISV's based
on their identifier combined with a salt. This allows for a certain
level of privacy preservation. Note that the RAND option for ueid
may be a suitable substitute for this claim.
3.2. HWVer
This is a bstr claim that distinguishes different system-on-chip
(SoC) models.
3.3. Context
This is a numerical (uint) index that denotes the context of the
attestation. The current values defined (0-4) are: on-demand
attestation, registration, provisioning, certificate issuance and
proof-of-possession.
3.4. PKHash
This is a bstr containing a SHA-256 hash of a public key provisioned
by the OEM. It can be used optionally in place of an OEM ID.
3.5. SPID
This is a numerical (uint) identifier of the service provider
associated with the QWES token. The EAT specification's origination
claim can be a suitable substitute.
3.6. QSEEVersion
This is tstr that designates the TEE version ("QSEE" = Qualcomm
Secure Execution Environment).
3.7. FWVersion
This is tstr that designates the firmware version specifically
dedicated to bootstrapping.
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3.8. Security State
This is tstr that contains the state of one-time programmable (OTP)
memory. Bits in this field will be set as per the security-impacting
section of the OTP memory. The relevant bits in OTP would normally
be used to control secure boot enablement, debug disablement, debug
enablement parameters, and the state of device keys (i.e. whether
they are locked for reading or writing).
3.9. CSR
A Certificate Signing Request (CSR) may be carried in a QWES token as
a bstr. This allows for a CA (certifying authority) to verify an
attestation and provide a certificate without an extra round trip.
This is an optional claim.
3.10. AppData
This is a bstr containing a hash of the associated application data.
Since the QWES token can be service provider-specific, the hash that
is returned can correspond to the corresponding user space
application that invoked the generation of the attestation token.
This is an optional claim.
4. Example
A sample QWES token payload is shown. It would be signed and/or
encrypted as per COSE guidelines.
{
/ DevID / h'0a',
/ OEMID / 32,
/ HWVer / h'0e',
/ Context / 2, / provisioning /
/ SPID / 10,
/ Nonce / h'da378321bb'
}
Sample QWES Token Payload
5. IANA Considerations
This memo includes no request to IANA.
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6. Normative References
[I-D.ietf-rats-eat]
Mandyam, G., Lundblade, L., Ballesteros, M., and J.
O'Donoghue, "The Entity Attestation Token (EAT)", draft-
ietf-rats-eat-00 (work in progress), June 2019.
[RFC7049] Bormann, C. and P. Hoffman, "Concise Binary Object
Representation (CBOR)", RFC 7049, DOI 10.17487/RFC7049,
October 2013, <https://www.rfc-editor.org/info/rfc7049>.
[RFC8152] Schaad, J., "CBOR Object Signing and Encryption (COSE)",
RFC 8152, DOI 10.17487/RFC8152, July 2017,
<https://www.rfc-editor.org/info/rfc8152>.
[RFC8392] Jones, M., Wahlstroem, E., Erdtman, S., and H. Tschofenig,
"CBOR Web Token (CWT)", RFC 8392, DOI 10.17487/RFC8392,
May 2018, <https://www.rfc-editor.org/info/rfc8392>.
Authors' Addresses
Giridhar Mandyam
Qualcomm Technologies Inc.
5775 Morehouse Drive
San Diego, California 92121
USA
Phone: +1 858 651 7200
Email: mandyam@qti.qualcomm.com
Vivek Sekhar
Qualcomm Technologies Inc.
5775 Morehouse Drive
San Diego, California 92121
USA
Phone: +1 858 651 3557
Email: vsekhar@qti.qualcomm.com
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Shahid Mohammed
Qualcomm Technologies Inc.
5775 Morehouse Drive
San Diego, California 92121
USA
Phone: +1 858 651 7975
Email: shahidm@qti.qualcomm.com
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