Concise Reference Integrity Manifest
draft-birkholz-rats-corim-00
The information below is for an old version of the document.
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|---|---|---|---|
| Authors | Henk Birkholz , Thomas Fossati , Yogesh Deshpande , Ned Smith , Wei Pan | ||
| Last updated | 2021-07-12 | ||
| Replaced by | draft-ietf-rats-corim | ||
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draft-birkholz-rats-corim-00
RATS Working Group H. Birkholz
Internet-Draft Fraunhofer SIT
Intended status: Standards Track T. Fossati
Expires: 13 January 2022 Y. Deshpande
Arm Limited
N. Smith
Intel
W. Pan
Huawei Technologies
12 July 2021
Concise Reference Integrity Manifest
draft-birkholz-rats-corim-00
Abstract
Abstract
Discussion Venues
This note is to be removed before publishing as an RFC.
Discussion of this document takes place on the RATS Working Group
mailing list (rats@ietf.org), which is archived at
https://mailarchive.ietf.org/arch/browse/rats/.
Source for this draft and an issue tracker can be found at
https://github.com/ietf-rats/draft-birkholz-rats-corim.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on 13 January 2022.
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Copyright Notice
Copyright (c) 2021 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents (https://trustee.ietf.org/
license-info) in effect on the date of publication of this document.
Please review these documents carefully, as they describe your rights
and restrictions with respect to this document. Code Components
extracted from this document must include Simplified BSD License text
as described in Section 4.e of the Trust Legal Provisions and are
provided without warranty as described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Requirements Notation . . . . . . . . . . . . . . . . . . 4
2. Concise Reference Integrity Manifests . . . . . . . . . . . . 4
2.1. Typographical Conventions . . . . . . . . . . . . . . . . 5
2.2. Prefixes and Namespaces . . . . . . . . . . . . . . . . . 6
2.3. Extensibility . . . . . . . . . . . . . . . . . . . . . . 6
2.4. Concise RIM Extension Points . . . . . . . . . . . . . . 6
2.5. CDDL Generic Types . . . . . . . . . . . . . . . . . . . 7
2.5.1. Non-Empty . . . . . . . . . . . . . . . . . . . . . . 7
2.5.2. One-Or-More . . . . . . . . . . . . . . . . . . . . . 7
3. Concise RIM Data Definition . . . . . . . . . . . . . . . . . 8
3.1. The signed-corim Container . . . . . . . . . . . . . . . 8
3.1.1. The corim-meta-map Container . . . . . . . . . . . . 8
3.1.2. The corim-entity-map Container . . . . . . . . . . . 9
3.1.3. The validity-map Container . . . . . . . . . . . . . 9
3.2. The unsigned-corim-map Container . . . . . . . . . . . . 10
3.2.1. The corim-locator-map Container . . . . . . . . . . . 10
3.3. The concise-mid-tag Container . . . . . . . . . . . . . . 11
3.4. The tag-identity-map Container . . . . . . . . . . . . . 11
3.5. The entity-map Container . . . . . . . . . . . . . . . . 12
3.6. The linked-tag-map Container . . . . . . . . . . . . . . 13
3.7. The triples-map Container . . . . . . . . . . . . . . . . 13
3.8. The environment-map Container . . . . . . . . . . . . . . 14
3.9. The class-map Container . . . . . . . . . . . . . . . . . 15
3.10. The measurement-map and measurement-values-map
Containers . . . . . . . . . . . . . . . . . . . . . . . 16
3.10.1. The version-map Container . . . . . . . . . . . . . 18
3.10.2. The svn-type-choice Enumeration . . . . . . . . . . 18
3.10.3. The raw-value-group Container . . . . . . . . . . . 19
3.10.4. The ip-addr-type-choice Enumeration . . . . . . . . 19
3.10.5. The mac-addr-type-choice Enumeration . . . . . . . . 19
3.11. The verification-key-map Container . . . . . . . . . . . 20
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4. Full CDDL Definition . . . . . . . . . . . . . . . . . . . . 20
5. Privacy Considerations . . . . . . . . . . . . . . . . . . . 34
6. Security Considerations . . . . . . . . . . . . . . . . . . . 34
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 34
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 34
8.1. Normative References . . . . . . . . . . . . . . . . . . 34
8.2. Informative References . . . . . . . . . . . . . . . . . 35
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 35
1. Introduction
The Remote Attestation Procedures (RATS) architecture
[I-D.ietf-rats-architecture] describes appraisal procedures for
attestation Evidence and Attestation Results. Appraisal procedures
for Evidence are conducted by Verifiers and are intended to assess
the trustworthiness of a remote peer. Appraisal procedures for
Attestation Results are conducted by Relying Parties and are intended
to operationalize the assessment about a remote peer and to act
appropriately based on the assessment. In order to enable their
intent, appraisal procedures consume Appraisal Policies, Reference
Values, and Endorsements.
This documents specifies a binary encoding for Reference Values using
the Concise Binary Object Representation (CBOR). The encoding is
based on three parts that are defined using the Concise Data
Definition Language (CDDL):
* Concise Reference Integrity Manifests (CoRIM),
* Concise Module Identifiers (CoMID), and
* Concise Software Identifier (CoSWID).
CoRIM and CoMID tags are defined in this document, CoSWID tags are
defined in [I-D.ietf-sacm-coswid]. CoRIM provide a wrapper
structure, in which CoMID tags, CoSWID tags, as well as corresponding
metadata can be bundled and signed as a whole. CoMID tags represent
hardware components and provide a counterpart to CoSWID tags, which
represent software components.
In accordance to [RFC4949], software components that are stored in
hardware modules are referred to as firmware. While firmware can be
represented as a software component, it is also very hardware-
specific and often resides directly on block devices instead of a
file system. In this specification, firmware and their Reference
Values are represented via CoMID tags. Reference Values for any
other software components stored on a file system are represented via
CoSWID tags.
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In addition to CoRIM - and respective CoMID tags - this specification
defines a Concise Manifest Revocation that represents a list of
reference to CoRIM that are actively marked as invalid before their
expiration time.
1.1. Requirements Notation
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in
BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all
capitals, as shown here.
2. Concise Reference Integrity Manifests
This section specifies the Concise RIM (CoRIM) format, the Concise
MID format (CoMID), and the extension to the CoSWID specification
that augments CoSWID tags to express specific relationships to CoMID
tags.
While each specification defines its own start rule, only CoMID and
CoSWID are stand-alone specifications. The CoRIM specification - as
the bundling format - has a dependency on CoMID and CoSWID and is not
a stand-alone specification.
While stand-alone CoSWID tags may be signed [I-D.ietf-sacm-coswid],
CoMID tags are not intended to be stand-alone and are always part of
a CoRIM that must be signed. [I-D.ietf-sacm-coswid] specifies the
use of COSE [RFC7231] for signing. This specification defines how to
generate singed CoRIM tags with COSE to enable proof of authenticity
and temper-evidence.
This document uses the Concise Data Definition Language (CDDL
[RFC8610]) to define the data structure of CoRIM and CoMID tags, as
well as the extensions to CoSWID. The CDDL definitions provided
define nested containers. Typically, the CDDL types used for nested
containers are maps. Every key used in the maps is a named type that
is associated with an corresponding uint via a block of rules
appended at the end of the CDDL definition.
Every set of uint keys that is used in the context of the "collision
domain" of map is intended to be collision-free (each key is intended
to be unique in the scope of a map, not a multimap). To accomplish
that, for each map there is an IANA registry for the map members of
maps.
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2.1. Typographical Conventions
Type names in the following CDDL definitions follow the naming
convention illustrated in table Table 1.
+========================+===============+=========================+
| type trait | example | typo convention |
+========================+===============+=========================+
| extensible type choice | int / text / | "$"NAME"-type-choice" |
| | ... | |
+------------------------+---------------+-------------------------+
| closed type choice | int / text | NAME"-type-choice" |
+------------------------+---------------+-------------------------+
| group choice | ( 1 => int // | "$$"NAME"-group-choice" |
| | 2 => text ) | |
+------------------------+---------------+-------------------------+
| group | ( 1 => int, 2 | NAME"-group" |
| | => text ) | |
+------------------------+---------------+-------------------------+
| type | int | NAME"-type" |
+------------------------+---------------+-------------------------+
| tagged type | #6.123(int) | "tagged-"NAME"-type" |
+------------------------+---------------+-------------------------+
| map | { 1 => int, 2 | NAME-"map" |
| | => text } | |
+------------------------+---------------+-------------------------+
| flags | &( a: 1, b: 2 | NAME-"flags" |
| | ) | |
+------------------------+---------------+-------------------------+
Table 1: Type Traits & Typographical Convention
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2.2. Prefixes and Namespaces
The semantics of the information elements (attributes) defined for
CoRIM, CoMID tags, and CoSWID tags are sometimes very similar, but
often do not share the same scope or are actually quite different.
In order to not overload the already existing semantics of the
software-centric IANA registries of CoSWID tags with, for example,
hardware-centric semantics of CoMID tags, new type names are
introduced. For example: both CoSWID tags and CoMID tags define a
tag-id. As CoSWID already specifies "tag-id", the tag-id in CoMID
tags is prefixed with "comid." to disambiguate the context, resulting
in "comid.tag-id". This prefixing provides a well-defined scope for
the use of the types defined in this document and guarantees
interoperability (no type name collisions) with the CoSWID CDDL
definition. Effectively, the prefixes used in this specification
enable simple hierarchical namespaces. The prefixing introduced is
also based on the anticipated namespace features for CDDL.
2.3. Extensibility
Both the CoRIM and the CoMID tag specification include extension
points using CDDL sockets (see [RFC8610] Section 3.9). The use of
CDDL sockets allows for well-formed extensions to be defined in
supplementary CDDL definitions that support additional uses of CoRIM
and CoMID tags.
There are two types of extensibility supported via the extension
points defined in this document. Both types allow for the addition
of keys in the scope of a map.
Custom Keys: The CDDL definition allows for the use of negative
integers as keys. These keys cannot take on a well-defined global
semantic. They can take on custom-defined semantics in a limited
or local scope, e.g. vendor-defined scope.
Registered Keys: Additional keys can be registered at IANA via
separate specifications.
Both types of extensibility also allow for the definition of new
nested maps that again can include additional defined keys.
2.4. Concise RIM Extension Points
The following CDDL sockets (extension points) are defined in the
CoRIM specification, which allow the addition of new information
structures to their respective CDDL groups.
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+======================+====================================+=======+
|Map Name | CDDL Socket |Defined|
| | |in |
+======================+====================================+=======+
|corim-entity-map | $$corim-entity-map-extension |Section|
| | |3.1.2 |
+----------------------+------------------------------------+-------+
|unsigned-corim-map | $$unsigned-corim-map-extension |Section|
| | |3.2 |
+----------------------+------------------------------------+-------+
|concise-mid-tag | $$comid-extension |Section|
| | |3.3 |
+----------------------+------------------------------------+-------+
|tag-identity-map | $$tag-identity-map-extension |Section|
| | |3.4 |
+----------------------+------------------------------------+-------+
|entity-map | $$entity-map-extension |Section|
| | |3.5 |
+----------------------+------------------------------------+-------+
|triples-map | $$triples-map-extension |Section|
| | |3.7 |
+----------------------+------------------------------------+-------+
|measurement-values-map| $$measurement-values-map-extension |Section|
| | |3.10 |
+----------------------+------------------------------------+-------+
Table 2: CoMID CDDL Group Extension Points
2.5. CDDL Generic Types
The CDDL definitions for CoRIM and CoMID tags use the two following
generic types.
2.5.1. Non-Empty
The non-empty generic type is used to express that a map with only
optional members MUST at least include one of the optional members.
non-empty<M> = (M) .within ({ + any => any })
2.5.2. One-Or-More
The one-or-more generic type allows to omit an encapsulating array,
if only one member would be present.
one-or-more<T> = T / [ 2* T ] ; 2*
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3. Concise RIM Data Definition
A CoRIM is a bundle of CoMID tags and/or CoSWID tags that can
reference each other and that includes additional metadata about that
bundle.
The root of the CDDL specification provided for CoRIM is the rule
"corim" :
start = corim
3.1. The signed-corim Container
A CoRIM is signed using [RFC7231]. The additional CoRIM-specific
COSE header member label corim-meta is defined as well as the
corresponding type corim-meta-map as its value. This rule and its
constraints MUST be followed when generating or validating a signed
CoMID tag.
signed-corim = #6.18(COSE-Sign1-corim)
protected-signed-corim-header-map = {
corim.alg-id => int
corim.content-type => "application/rim+cbor"
corim.issuer-key-id => bstr
corim.meta => corim-meta-map
* cose-label => cose-values
}
unprotected-signed-corim-header-map = {
* cose-label => cose-values
}
COSE-Sign1-corim = [
protected: bstr .cbor protected-signed-corim-header-map
unprotected: unprotected-signed-corim-header-map
payload: bstr .cbor unsigned-corim-map
signature: bstr
]
3.1.1. The corim-meta-map Container
This map contains the two additionally defined attributes "corim-
entity-map" and "validity-map" that are used to annotate a CoRIM with
metadata.
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corim-meta-map = {
corim.signer => one-or-more<corim-entity-map>
? corim.validity => validity-map
}
corim.signer: One or more entities that created and/or signed the
issued CoRIM.
corim.validity: A time period defining the validity span of a CoRIM.
3.1.2. The corim-entity-map Container
This map is used to identify the signer of a CoRIM via a dedicated
entity name, a corresponding role and an optional identifying URI.
corim-entity-map = {
corim.entity-name => $entity-name-type-choice
? corim.reg-id => uri
corim.role => $corim-role-type-choice
* $$corim-entity-map-extension
}
$corim-role-type-choice /= corim.manifest-creator
$corim-role-type-choice /= corim.manifest-signer
corim.entity-name: The name of the organization that takes on the
role expressed in "corim.role"
corim.reg-id: The registration identifier of the organization that
has authority over the namespace for "corim.entity-name".
corim.role: The role type that is associated with the entity, e.g.
the creator of the CoRIM or the signer of the CoRIM.
$$corim-entity-map-extension: This CDDL socket is used to add new
information elements to the corim-entity-map container. See
FIXME.
3.1.3. The validity-map Container
The members of this map indicate the life-span or period of validity
of a CoRIM that is baked into the protected header at the time of
signing.
validity-map = {
? corim.not-before => time
corim.not-after => time
}
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corim.not-before: The timestamp indicating the CoRIM's begin of its
validity period.
corim.not-after: The timestamp indicating the CoRIM's end of its
validity period.
3.2. The unsigned-corim-map Container
This map contains the payload of the COSE envelope that is used to
sign the CoRIM. This rule and its constraints MUST be followed when
generating or validating an unsigned Concise RIM.
unsigned-corim-map = {
corim.id => $corim-id-type-choice
corim.tags => one-or-more<$concise-tag-type-choice>
? corim.dependent-rims => one-or-more<corim-locator-map>
* $$unsigned-corim-map-extension
}
$corim-id-type-choice /= tstr
$corim-id-type-choice /= uuid-type
$concise-tag-type-choice /= #6.TBD-SWID(bytes .cbor concise-swid-tag)
$concise-tag-type-choice /= #6.TBD-CoMID(bytes .cbor concise-mid-tag)
corim.id: Typically a UUID or a text string that MUST uniquely
identify a CoRIM in a given scope.
corim.tags: A collection of one or more CoMID tags and/or CoSWID
tags.
corim.dependent-rims: One or more services available via the
Internet that can supply additional, possibly dependent manifests
(or other associated resources).
$$unsigned-corim-map-extension: This CDDL socket is used to add new
information elements to the unsigned-corim-map container. See
FIXME.
3.2.1. The corim-locator-map Container
This map is used to locate and verify the integrity of resources
provided by external services, e.g. the CoRIM provider.
corim-locator-map = {
corim.href => uri
? corim.thumbprint => hash-entry
}
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corim.href: A pointer to a services that supplies dependent files or
records.
corim.thumbprint: A digest of the reference resource.
3.3. The concise-mid-tag Container
The CDDL specification for the root concise-mid-tag map is as
follows. This rule and its constraints MUST be followed when
generating or validating a CoMID tag.
concise-mid-tag = {
? comid.language => language-type
comid.tag-identity => tag-identity-map
? comid.entity => one-or-more<entity-map>
? comid.linked-tags => one-or-more<linked-tag-map>
comid.triples => triples-map
* $$concise-mid-tag-extension
}
The following describes each member of the concise-mid-tag root map.
comid.language: A textual language tag that conforms with the IANA
Language Subtag Registry [IANA.language-subtag-registry].
comid.tag-identity: A composite identifier containing identifying
attributes that enable global unique identification of a CoMID tag
across versions.
comid.entity: A list of entities that contributed to the CoMID tag.
comid.linked-tags: A lost of tags that are linked to this CoMID tag.
comid.triples: A set of relationships in the form of triples,
representing a graph-like and semantic reference structure between
tags.
$$comid-mid-tag-extension: This CDDL socket is used to add new
information elements to the concise-mid-tag root container. See
FIXME.
3.4. The tag-identity-map Container
The CDDL specification for the tag-identity-map includes all
identifying attributes that enable a consumer of information to
anticipate required capabilities to process the corresponding tag
that map is included in. This rule and its constraints MUST be
followed when generating or validating a CoMID tag.
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tag-identity-map = {
comid.tag-id => $tag-id-type-choice
comid.tag-version => tag-version-type
* $$tag-identity-map-extension
}
$tag-id-type-choice /= tstr
$tag-id-type-choice /= uuid-type
tag-version-type = uint .default 0
The following describes each member of the tag-identity-map
container.
comid.tag-id: An identifier for a CoMID that MUST be globally
unique.
comid.tag-version: An unsigned integer used as a version identifier.
$$tag-identity-map-extension: This CDDL socket is used to add new
information elements to the tag-identity-map container. See
FIXME.
3.5. The entity-map Container
This Container provides qualifying attributes that provide more
context information describing the module as well its origin and
purpose. This rule and its constraints MUST be followed when
generating or validating a CoMID tag.
entity-map = {
comid.entity-name => $entity-name-type-choice
? comid.reg-id => uri
comid.role => one-or-more<$comid-role-type-choice>
* $$entity-map-extension
}
$comid-role-type-choice /= comid.tag-creator
$comid-role-type-choice /= comid.creator
$comid-role-type-choice /= comid.maintainer
The following describes each member of the tag-identity-map
container.
comid.entity-name: The name of an organization that performs the
roles as indicated by comid.role.
comid.reg-id: The registration identifier of the organization that
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has authority over the namespace for "comid.entity-name".
comid.role: The list of roles a CoMID entity is associated with.
The entity that generates the concise-mid-tag SHOULD include a
$comid-role-type-choice value of comid.tag-creator.
$$entity-map-extension: This CDDL socket is used to add new
information elements to the entity-map container. See FIXME.
3.6. The linked-tag-map Container
A list of tags that are linked to this CoMID tag.
linked-tag-map = {
comid.linked-tag-id => $tag-id-type-choice
comid.tag-rel => $tag-rel-type-choice
}
$tag-rel-type-choice /= comid.supplements
$tag-rel-type-choice /= comid.replaces
The following describes each member of the linked-tag-map container.
comid.linked-tag-id: The tag-id of the linked tag. A linked tag MAY
be a CoMID tag or a CoSWID tag.
comid.tag-rel: The relationship type with the linked tag. The
relationship type MAY be "supplements" or "replaces", as well as
other types well-defined by additional specifications.
3.7. The triples-map Container
A set of directed properties that associate sets of data to provide
reference values, endorsed values, verification key material or
identifying key material for a specific hardware module that is a
component of a composite device. The map provides the core element
of CoMID tags that associate remote attestation relevant data with a
distinct hardware component that runs an execution environment (a
module that is either a Target Environment and/or an Attesting
Environment). This rule and its constraints MUST be followed when
generating or validating a CoMID tag.
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triples-map = non-empty<{
? comid.reference-triples => one-or-more<reference-triple-record>
? comid.endorsed-triples => one-or-more<endorsed-triple-record>
? comid.attest-key-triples => one-or-more<attest-key-triple-record>
? comid.identity-triples => one-or-more<identity-triple-record>
* $$triples-map-extension
}>
The following describes each member of the triple-map container.
comid.reference-triples: A directed property that associates
reference measurements with a module that is a Target Environment.
comid.endorsed-triples: A directed property that associates endorsed
measurements with a module that is a Target Environment or
Attesting Environment.
comid.attest-key-triples: A directed property that associates key
material used to verify evidence generated from a module that is
an attesting environment.
comid.identity-triples: A directed property that associates key
material used to identify a module instance or a module class that
is an identifying part of a device(-set).
$$triples-map-extension: This CDDL socket is used to add new
information elements to the triples-map container. See FIXME.
3.8. The environment-map Container
This map represents the module(s) that a triple-map can point
directed properties (relationships) from in order to associate them
with external information for remote attestation, such as reference
values, endorsement and endorsed values, verification key material
for evidence, or identifying key material for module
(re-)identification. This map can identify a single module instance
via "comid.instance" or groups of modules via "comid.group".
Referencing classes of modules requires the use of the more complex
"class-map" container. This rule and its constraints MUST be
followed when generating or validating a CoMID tag.
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environment-map = non-empty<{
? comid.class => class-map
? comid.instance => $instance-id-type-choice
? comid.group => $group-id-type-choice
}>
$instance-id-type-choice /= tagged-ueid-type
$instance-id-type-choice /= tagged-uuid-type
$group-id-type-choice /= tagged-uuid-type
The following describes each member of the environment-map container.
comid-class: A composite identifier for classes of environments/
modules.
comid.instance: An identifier for distinct instances of
environments/modules that is either a UEID or a UUID.
comid.group: An identifier for a group of environments/modules that
is a UUID.
3.9. The class-map Container
This map enables a composite identifier intended to uniquely identify
modules that are of a distinct class of devices. Effectively, all
provided members in combination are a composite module class
identifier. This rule and its constraints MUST be followed when
generating or validating a CoMID tag. This rule and its constraints
MUST be followed when generating or validating a CoMID tag.
class-map = non-empty<{
? comid.class-id => $class-id-type-choice
? comid.vendor => tstr
? comid.model => tstr
? comid.layer => uint
? comid.index => uint
}>
$class-id-type-choice /= tagged-oid-type
$class-id-type-choice /= tagged-impl-id-type
$class-id-type-choice /= tagged-uuid-type
The following describes each member of the class-map container.
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3.10. The measurement-map and measurement-values-map Containers
One of the targets (range) that a triple-map can point to in order to
associate it with a module (domain) is the measurement-map. This map
is used to provide reference measurements values that can be compared
with Evidence Claim values or Endorsements and endorsed values from
other sources than the corresponding CoRIM. "measurement-map" comes
with a measurement key that identifies the measured element with via
a OID reference or a UUID. "measurement-values-map" contains the
actual measurements associated with the module(s). Byte strings with
corresponding bit masks that highlights which bits in the byte string
are used as reference measurements or endorsement are located in
"raw-value-group". The members of "measurement-values-map" provide
well-defined and well-scoped semantics for reference measurement or
endorsements with respect to a given module instance, class, or
group. This rule and its constraints MUST be followed when
generating or validating a CoMID tag.
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measurement-map = {
? comid.mkey => $measured-element-type-choice
comid.mval => measurement-values-map
}
$measured-element-type-choice /= tagged-oid-type
$measured-element-type-choice /= tagged-uuid-type
measurement-values-map = non-empty<{
? comid.ver => version-map
? comid.svn => svn-type-choice
? comid.digests => digests-type
? comid.flags => flags-type
? raw-value-group
? comid.mac-addr => mac-addr-type-choice
? comid.ip-addr => ip-addr-type-choice
? comid.serial-number => serial-number-type
? comid.ueid => ueid-type
? comid.uuid => uuid-type
* $$measurement-values-map-extension
}>
flags-type = bytes .bits operational-flags
operational-flags = &(
not-configured: 0
not-secure: 1
recovery: 2
debug: 3
)
serial-number-type = text
digests-type = one-or-more<hash-entry>
The following describes each member of the measurement-map and the
measurement-values-map container.
comid.mkey: An identifier for the set of measurements expressed in
measurement-values-map that is either an OID or a UUID.
comid.ver: A version number measurement.
comid.svn: A security related version number measurement.
comid.digests: A digest (typically a hash value) measurement.
comid.flags: Measurements that reflect operational modes that are
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made permanent at manufacturing time such that they are not
expected to change during normal operation of the Attester.
raw-value-group: A measurement in the form of a byte string that can
come with a corresponding bit mask defining the relevance of each
bit in the byte string as a measurement.
comid.mac-addr: An EUI-48 or EUI-64 MAC address measurement.
comid.ip-addr: An Ipv4 or Ipv6 address measurement.
comid.serial-number: A measurement of a serial number in text.
comid.ueid: A measurement of a Unique Enough Identifier (UEID).
comid.uuid: A measurement of a Universally Unique Identifier (UUID).
$$measurement-values-map-extension: This CDDL socket is used to add
new information elements to the measurement-values-map container.
See FIXME.
3.10.1. The version-map Container
This map expresses reference values about version information.
version-map = {
comid.version => version-type
? comid.version-scheme => $version-scheme
}
version-type = text .default '0.0.0'
The following describes each member of the version-map container.
comid.version: The version in the form of a text string.
comid-version-scheme: The version-scheme of the text string value as
defined in [I-D.ietf-sacm-coswid]
3.10.2. The svn-type-choice Enumeration
This choice defines the CBOR tagged Security Version Numbers (SVN)
that can be used as reference values for Evidence and Endorsements.
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svn = int
min-svn = int
tagged-svn = #6.TBD-SVN(svn)
tagged-min-svn = #6.TBD-minSVN(min-svn)
svn-type-choice = tagged-svn / tagged-min-svn
The following describes the types in the svn-type-choice enumeration.
tagged-svn: A specific SVN.
tagged-min-svn: A lower bound for allowed SVN.
3.10.3. The raw-value-group Container
FIXME This group can express a single raw byte value and can come
with an optional bit mask that defines which bits in the byte string
is used as a reference value, by setting corresponding position in
the bit mask to 1.
raw-value-group = (
comid.raw-value => raw-value-type
? comid.raw-value-mask => raw-value-mask-type
)
raw-value-type = bytes
raw-value-mask-type = bytes
The following describes the types in the raw-value-group Container.
comid.raw-value: FIXME Bit positions in raw-value-type that
correspond to bit positions in raw-value-mask-type.
comid.raw-value-mask: A raw-value-mask-type bit corresponding to a
bit in raw-value-type MUST be 1 to evaluate the corresponding raw-
value-type bit.
3.10.4. The ip-addr-type-choice Enumeration
This type choice expresses IP addresses as reference values.
ip-addr-type-choice = ip4-addr-type / ip6-addr-type
ip4-addr-type = bytes .size 4
ip6-addr-type = bytes .size 16
3.10.5. The mac-addr-type-choice Enumeration
This type choice expresses MAC addresses as reference values.
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mac-addr-type-choice = eui48-addr-type / eui64-addr-type
eui48-addr-type = bytes .size 6
eui64-addr-type = bytes .size 8
3.11. The verification-key-map Container
One of the targets (range) that a triple-map can point to in order to
associate it with a module (domain). This map is used to provide the
key material for evidence verification (effectively signature
checking or a lightweight proof-of-possession of private signing key
material) or for identity assertion/check (where a proof-of-
possession implies a certain device identity). In support of
informed trust decisions, an optional trust anchor in the form a PKIX
certification path that is associated with the provided key material
can be included. This rule and its constraints MUST be followed when
generating or validating a CoMID tag.
verification-key-map = {
comid.key => pkix-base64-key-type
? comid.keychain => [ + pkix-base64-cert-type ]
}
pkix-base64-key-type = tstr
pkix-base64-cert-type = tstr
The following describes each member of the verification-key-map
container.
comid.key: Verification key material in DER format base64 encoded.
Typically, but not necessarily, a public key.
comid.keychain: One or more base64 encoded PKIX certificates. The
certificate containing the public key in comid.key MUST be the
first certificate. Additional certificates MAY follow. Each
subsequent certificate SHOULD certify the previous certificate.
4. Full CDDL Definition
This section aggregates the CDDL definitions specified in this
document in a full CDDL definitions including:
* the COSE envelope for CoRIM: signed-corim
* the CoRIM document: unsigned-corim
* the CoMID document: concise-mid-tag
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Not included in the full CDDL definition are CDDL dependencies to
CoSWID. The following CDDL definitions can be found in
[I-D.ietf-sacm-coswid]:
* the COSE envelope for CoRIM: signed-coswid
* the CoSWID document: concise-swid-tag
<CODE BEGINS>
corim = #6.500($concise-reference-integrity-manifest-type-choice)
$concise-reference-integrity-manifest-type-choice /= #6.501(unsigned-corim-map)
$concise-reference-integrity-manifest-type-choice /= #6.502(signed-corim)
signed-corim = #6.18(COSE-Sign1-corim)
protected-signed-corim-header-map = {
corim.alg-id => int
corim.content-type => "application/rim+cbor"
corim.issuer-key-id => bstr
corim.meta => corim-meta-map
* cose-label => cose-values
}
corim-meta-map = {
corim.signer => one-or-more<corim-entity-map>
? corim.validity => validity-map
}
corim-entity-map = {
corim.entity-name => $entity-name-type-choice
? corim.reg-id => uri
corim.role => $corim-role-type-choice
* $$corim-entity-map-extension
}
$corim-role-type-choice /= corim.manifest-creator
$corim-role-type-choice /= corim.manifest-signer
validity-map = {
? corim.not-before => time
corim.not-after => time
}
unprotected-signed-corim-header-map = {
* cose-label => cose-values
}
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COSE-Sign1-corim = [
protected: bstr .cbor protected-signed-corim-header-map
unprotected: unprotected-signed-corim-header-map
payload: bstr .cbor unsigned-corim-map
signature: bstr
]
unsigned-corim-map = {
corim.id => $corim-id-type-choice
corim.tags => one-or-more<$concise-tag-type-choice>
? corim.dependent-rims => one-or-more<corim-locator-map>
* $$unsigned-corim-map-extension
}
corim-locator-map = {
corim.href => uri
? corim.thumbprint => hash-entry
}
$concise-tag-type-choice /= #6.505(bytes .cbor concise-swid-tag)
$concise-tag-type-choice /= #6.506(bytes .cbor concise-mid-tag)
concise-mid-tag = {
? comid.language => language-type
comid.tag-identity => tag-identity-map
? comid.entity => one-or-more<entity-map>
? comid.linked-tags => one-or-more<linked-tag-map>
comid.triples => triples-map
* $$concise-mid-tag-extension
}
language-type = text
tag-identity-map = {
comid.tag-id => $tag-id-type-choice
? comid.tag-version => tag-version-type
}
$tag-id-type-choice /= tstr
$tag-id-type-choice /= uuid-type
tag-version-type = uint .default 0
entity-map = {
comid.entity-name => $entity-name-type-choice
? comid.reg-id => uri
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comid.role => one-or-more<$comid-role-type-choice>
* $$entity-map-extension
}
$comid-role-type-choice /= comid.tag-creator
$comid-role-type-choice /= comid.creator
$comid-role-type-choice /= comid.maintainer
linked-tag-map = {
comid.linked-tag-id => $tag-id-type-choice
comid.tag-rel => $tag-rel-type-choice
}
$tag-rel-type-choice /= comid.supplements
$tag-rel-type-choice /= comid.replaces
triples-map = non-empty<{
? comid.reference-triples => one-or-more<reference-triple-record>
? comid.endorsed-triples => one-or-more<endorsed-triple-record>
? comid.attest-key-triples => one-or-more<attest-key-triple-record>
? comid.identity-triples => one-or-more<identity-triple-record>
* $$triples-map-extension
}>
reference-triple-record = [
environment-map ; target environment
one-or-more<measurement-map> ; reference measurements
]
endorsed-triple-record = [
environment-map ; (target or attesting) environment
one-or-more<measurement-map> ; endorsed measurements
]
attest-key-triple-record = [
environment-map ; attesting environment
one-or-more<verification-key-map> ; attestation verification key(s)
]
identity-triple-record = [
environment-map ; device identifier (instance or class)
one-or-more<verification-key-map> ; DevID, or semantically equivalent
]
pkix-base64-key-type = tstr
pkix-base64-cert-type = tstr
verification-key-map = {
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; Verification key in DER format base64-encoded.
; Typically, but not necessarily a public key.
comid.key => pkix-base64-key-type
; Optional X.509 certificate chain corresponding to the public key
; in comid.key, encoded as an array of one or more base64-encoded
; DER PKIX certificates. The certificate containing the public key
; in comid.key MUST be the first certificate. This MAY be followed
; by additional certificates, with each subsequent certificate
; being the one used to certify the previous one.
? comid.keychain => [ + pkix-base64-cert-type ]
}
environment-map = non-empty<{
? comid.class => class-map
? comid.instance => $instance-id-type-choice
? comid.group => $group-id-type-choice
}>
class-map = non-empty<{
; TODO(tho) add text "class-map SHOULD include class-id"
? comid.class-id => $class-id-type-choice
? comid.vendor => tstr
? comid.model => tstr
? comid.layer => uint
? comid.index => uint
}>
$class-id-type-choice /= tagged-oid-type
$class-id-type-choice /= tagged-impl-id-type
$class-id-type-choice /= tagged-uuid-type
$instance-id-type-choice /= tagged-ueid-type
$instance-id-type-choice /= tagged-uuid-type
$group-id-type-choice /= tagged-uuid-type
oid-type = bytes
tagged-oid-type = #6.111(oid-type)
tagged-uuid-type = #6.37(uuid-type)
ueid-type = bytes .size 33
tagged-ueid-type = #6.550(ueid-type)
impl-id-type = bytes .size 32
tagged-impl-id-type = #6.551(impl-id-type)
$measured-element-type-choice /= tagged-oid-type
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$measured-element-type-choice /= tagged-uuid-type
measurement-map = {
? comid.mkey => $measured-element-type-choice
comid.mval => measurement-values-map
}
measurement-values-map = non-empty<{
? comid.ver => version-map
? comid.svn => svn-type-choice
? comid.digests => digests-type
? comid.flags => flags-type
? raw-value-group
? comid.mac-addr => mac-addr-type-choice
? comid.ip-addr => ip-addr-type-choice
? comid.serial-number => serial-number-type
? comid.ueid => ueid-type
? comid.uuid => uuid-type
* $$measurement-values-map-extension
}>
version-map = {
comid.version => version-type
? comid.version-scheme => $version-scheme
}
version-type = text .default '0.0.0'
svn = int
min-svn = int
tagged-svn = #6.552(svn)
tagged-min-svn = #6.553(min-svn)
svn-type-choice = tagged-svn / tagged-min-svn
flags-type = bytes .bits operational-flags
operational-flags = &(
not-configured: 0
not-secure: 1
recovery: 2
debug: 3
)
raw-value-group = (
comid.raw-value => raw-value-type
? comid.raw-value-mask => raw-value-mask-type
)
raw-value-type = bytes
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raw-value-mask-type = bytes
ip-addr-type-choice = ip4-addr-type / ip6-addr-type
ip4-addr-type = bytes .size 4
ip6-addr-type = bytes .size 16
mac-addr-type-choice = eui48-addr-type / eui64-addr-type
eui48-addr-type = bytes .size 6
eui64-addr-type = bytes .size 8
serial-number-type = text
digests-type = one-or-more<hash-entry>
concise-swid-tag = {
tag-id => text / bstr .size 16,
tag-version => integer,
? corpus => bool,
? patch => bool,
? supplemental => bool,
software-name => text,
? software-version => text,
? version-scheme => $version-scheme,
? media => text,
? software-meta => one-or-more<software-meta-entry>,
entity => one-or-more<entity-entry>,
? link => one-or-more<link-entry>,
? payload-or-evidence,
* $$coswid-extension,
global-attributes,
}
payload-or-evidence //= ( payload => payload-entry )
payload-or-evidence //= ( evidence => evidence-entry )
any-uri = uri
label = text / int
$version-scheme /= multipartnumeric
$version-scheme /= multipartnumeric-suffix
$version-scheme /= alphanumeric
$version-scheme /= decimal
$version-scheme /= semver
$version-scheme /= int / text
any-attribute = (
label => one-or-more<text> / one-or-more<int>
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)
one-or-more<T> = T / [ 2* T ]
global-attributes = (
? lang => text,
* any-attribute,
)
hash-entry = [
hash-alg-id: int,
hash-value: bytes,
]
entity-entry = {
entity-name => text,
? reg-id => any-uri,
role => one-or-more<$role>,
? thumbprint => hash-entry,
* $$entity-extension,
global-attributes,
}
$role /= tag-creator
$role /= software-creator
$role /= aggregator
$role /= distributor
$role /= licensor
$role /= maintainer
$role /= int / text
link-entry = {
? artifact => text,
href => any-uri,
? media => text,
? ownership => $ownership,
rel => $rel,
? media-type => text,
? use => $use,
* $$link-extension,
global-attributes,
}
$ownership /= shared
$ownership /= private
$ownership /= abandon
$ownership /= int / text
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$rel /= ancestor
$rel /= component
$rel /= feature
$rel /= installationmedia
$rel /= packageinstaller
$rel /= parent
$rel /= patches
$rel /= requires
$rel /= see-also
$rel /= supersedes
$rel /= supplemental
$rel /= -256..64436 / text
$use /= optional
$use /= required
$use /= recommended
$use /= int / text
software-meta-entry = {
? activation-status => text,
? channel-type => text,
? colloquial-version => text,
? description => text,
? edition => text,
? entitlement-data-required => bool,
? entitlement-key => text,
? generator => text,
? persistent-id => text,
? product => text,
? product-family => text,
? revision => text,
? summary => text,
? unspsc-code => text,
? unspsc-version => text,
* $$software-meta-extension,
global-attributes,
}
path-elements-group = ( ? directory => one-or-more<directory-entry>,
? file => one-or-more<file-entry>,
)
resource-collection = (
path-elements-group,
? process => one-or-more<process-entry>,
? resource => one-or-more<resource-entry>,
* $$resource-collection-extension,
)
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file-entry = {
filesystem-item,
? size => uint,
? file-version => text,
? hash => hash-entry,
* $$file-extension,
global-attributes,
}
directory-entry = {
filesystem-item,
? path-elements => { path-elements-group },
* $$directory-extension,
global-attributes,
}
process-entry = {
process-name => text,
? pid => integer,
* $$process-extension,
global-attributes,
}
resource-entry = {
type => text,
* $$resource-extension,
global-attributes,
}
filesystem-item = (
? key => bool,
? location => text,
fs-name => text,
? root => text,
)
payload-entry = {
resource-collection,
* $$payload-extension,
global-attributes,
}
evidence-entry = {
resource-collection,
? date => integer-time,
? device-id => text,
* $$evidence-extension,
global-attributes,
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}
integer-time = #6.1(int)
tag-id = 0
software-name = 1
entity = 2
evidence = 3
link = 4
software-meta = 5
payload = 6
hash = 7
corpus = 8
patch = 9
media = 10
supplemental = 11
tag-version = 12
software-version = 13
version-scheme = 14
lang = 15
directory = 16
file = 17
process = 18
resource = 19
size = 20
file-version = 21
key = 22
location = 23
fs-name = 24
root = 25
path-elements = 26
process-name = 27
pid = 28
type = 29
entity-name = 31
reg-id = 32
role = 33
thumbprint = 34
date = 35
device-id = 36
artifact = 37
href = 38
ownership = 39
rel = 40
media-type = 41
use = 42
activation-status = 43
channel-type = 44
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colloquial-version = 45
description = 46
edition = 47
entitlement-data-required = 48
entitlement-key = 49
generator = 50
persistent-id = 51
product = 52
product-family = 53
revision = 54
summary = 55
unspsc-code = 56
unspsc-version = 57
multipartnumeric = 1
multipartnumeric-suffix = 2
alphanumeric = 3
decimal = 4
semver = 16384
tag-creator=1
software-creator=2
aggregator=3
distributor=4
licensor=5
maintainer=6
shared=1
private=2
abandon=3
ancestor=1
component=2
feature=3
installationmedia=4
packageinstaller=5
parent=6
patches=7
requires=8
see-also=9
supersedes=10
optional=1
required=2
recommended=3
comid.language = 0
comid.tag-identity = 1
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comid.entity = 2
comid.linked-tags = 3
comid.triples = 4
comid.tag-id = 0
comid.tag-version = 1
comid.entity-name = 0
comid.reg-id = 1
comid.role = 2
comid.linked-tag-id = 0
comid.tag-rel = 1
comid.reference-triples = 0
comid.endorsed-triples = 1
comid.identity-triples = 2
comid.attest-key-triples = 3
comid.class = 0
comid.instance = 1
comid.group = 2
comid.class-id = 0
comid.vendor = 1
comid.model = 2
comid.layer = 3
comid.index = 4
comid.mkey = 0
comid.mval = 1
comid.ver = 0
comid.svn = 1
comid.digests = 2
comid.flags = 3
comid.raw-value = 4
comid.raw-value-mask = 5
comid.mac-addr = 6
comid.ip-addr = 7
comid.serial-number = 8
comid.ueid = 9
comid.uuid = 10
comid.key = 0
comid.keychain = 1
comid.version = 0
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comid.version-scheme = 1
comid.supplements = 0
comid.replaces = 1
comid.tag-creator = 0
comid.creator = 1
comid.maintainer = 2
corim.id = 0
corim.tags = 1
corim.dependent-rims = 2
corim.href = 0
corim.thumbprint = 1
corim.alg-id = 1
corim.content-type = 3
corim.issuer-key-id = 4
corim.meta = 8
corim.not-before = 0
corim.not-after = 1
corim.signer = 0
corim.validity = 1
corim.entity-name = 0
corim.reg-id = 1
corim.role = 2
corim.manifest-creator = 1
corim.manifest-signer = 2
non-empty<M> = (M) .within ({ + any => any })
cose-label = int / tstr
cose-values = any
$entity-name-type-choice /= text
$corim-id-type-choice /= tstr
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$corim-id-type-choice /= uuid-type
uuid-type = bytes .size 16
<CODE ENDS>
5. Privacy Considerations
Privacy Considerations
6. Security Considerations
Security Considerations
7. IANA Considerations
See Body Section 2.
8. References
8.1. Normative References
[I-D.ietf-rats-architecture]
Birkholz, H., Thaler, D., Richardson, M., Smith, N., and
W. Pan, "Remote Attestation Procedures Architecture", Work
in Progress, Internet-Draft, draft-ietf-rats-architecture-
12, 23 April 2021, <https://datatracker.ietf.org/doc/html/
draft-ietf-rats-architecture-12>.
[I-D.ietf-sacm-coswid]
Birkholz, H., Fitzgerald-McKay, J., Schmidt, C., and D.
Waltermire, "Concise Software Identification Tags", Work
in Progress, Internet-Draft, draft-ietf-sacm-coswid-17, 22
February 2021, <https://datatracker.ietf.org/doc/html/
draft-ietf-sacm-coswid-17>.
[IANA.language-subtag-registry]
IANA, "Language Subtag Registry",
<http://www.iana.org/assignments/language-subtag-
registry>.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<https://www.rfc-editor.org/rfc/rfc2119>.
Birkholz, et al. Expires 13 January 2022 [Page 34]
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[RFC7231] Fielding, R., Ed. and J. Reschke, Ed., "Hypertext Transfer
Protocol (HTTP/1.1): Semantics and Content", RFC 7231,
DOI 10.17487/RFC7231, June 2014,
<https://www.rfc-editor.org/rfc/rfc7231>.
[RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
May 2017, <https://www.rfc-editor.org/rfc/rfc8174>.
[RFC8610] Birkholz, H., Vigano, C., and C. Bormann, "Concise Data
Definition Language (CDDL): A Notational Convention to
Express Concise Binary Object Representation (CBOR) and
JSON Data Structures", RFC 8610, DOI 10.17487/RFC8610,
June 2019, <https://www.rfc-editor.org/rfc/rfc8610>.
8.2. Informative References
[RFC4949] Shirey, R., "Internet Security Glossary, Version 2",
FYI 36, RFC 4949, DOI 10.17487/RFC4949, August 2007,
<https://www.rfc-editor.org/rfc/rfc4949>.
Authors' Addresses
Henk Birkholz
Fraunhofer SIT
Rheinstrasse 75
64295 Darmstadt
Germany
Email: henk.birkholz@sit.fraunhofer.de
Thomas Fossati
Arm Limited
United Kingdom
Email: Thomas.Fossati@arm.com
Yogesh Deshpande
Arm Limited
United Kingdom
Email: yogesh.deshpande@arm.com
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Ned Smith
Intel Corporation
United States of America
Email: ned.smith@intel.com
Wei Pan
Huawei Technologies
Email: william.panwei@huawei.com
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