ACE Working Group M. Tiloca Internet-Draft R. Höglund Intended status: Standards Track RISE AB Expires: 17 July 2024 14 January 2024 Using the Constrained RESTful Application Language (CoRAL) with the Admin Interface for the OSCORE Group Manager draft-ietf-ace-oscore-gm-admin-coral-01 Abstract Group communication for CoAP can be secured using Group Object Security for Constrained RESTful Environments (Group OSCORE). A Group Manager is responsible to handle the joining of new group members, as well as to manage and distribute the group keying material. The Group Manager can provide a RESTful admin interface that allows an Administrator entity to create and delete OSCORE groups, as well as to retrieve and update their configuration. This document specifies how an Administrator entity interacts with the admin interface at the Group Manager by using the Constrained RESTful Application Language (CoRAL). The ACE framework for Authentication and Authorization is used to enforce authentication and authorization of the Administrator at the Group Manager. Protocol-specific transport profiles of ACE are used to achieve communication security, proof-of-possession and server authentication. Discussion Venues This note is to be removed before publishing as an RFC. Discussion of this document takes place on the Authentication and Authorization for Constrained Environments Working Group mailing list (ace@ietf.org), which is archived at https://mailarchive.ietf.org/arch/browse/ace/. Source for this draft and an issue tracker can be found at https://github.com/ace-wg/ace-oscore-gm-admin-coral. 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/. Tiloca & Höglund Expires 17 July 2024 [Page 1] Internet-Draft CoRAL Admin Interface for the OSCORE GM January 2024 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 17 July 2024. Copyright Notice Copyright (c) 2024 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 Revised BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Revised BSD License. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 4 1.2. Notation and Assumptions in the Examples . . . . . . . . 6 2. Group Administration . . . . . . . . . . . . . . . . . . . . 7 2.1. Managing OSCORE Groups . . . . . . . . . . . . . . . . . 7 2.2. Collection Representation . . . . . . . . . . . . . . . . 7 2.3. Discovery . . . . . . . . . . . . . . . . . . . . . . . . 7 3. Format of Scope . . . . . . . . . . . . . . . . . . . . . . . 7 4. Getting Access to the Group Manager . . . . . . . . . . . . . 8 4.1. Multiple Administrators for the Same OSCORE Group . . . . 8 5. Group Configurations . . . . . . . . . . . . . . . . . . . . 8 5.1. Group Configuration Representation . . . . . . . . . . . 8 5.1.1. Configuration Properties . . . . . . . . . . . . . . 9 5.1.2. Status Properties . . . . . . . . . . . . . . . . . . 9 5.2. Default Values . . . . . . . . . . . . . . . . . . . . . 9 6. Interactions with the Group Manager . . . . . . . . . . . . . 9 6.1. Retrieve the Full List of Group Configurations . . . . . 10 6.2. Retrieve a List of Group Configurations by Filters . . . 10 6.3. Create a New Group Configuration . . . . . . . . . . . . 12 6.4. Retrieve a Group Configuration . . . . . . . . . . . . . 14 6.5. Retrieve Part of a Group Configuration by Filters . . . . 16 6.6. Overwrite a Group Configuration . . . . . . . . . . . . . 17 6.6.1. Effects on Joining Nodes . . . . . . . . . . . . . . 18 6.6.2. Effects on the Group Members . . . . . . . . . . . . 18 6.7. Selective Update of a Group Configuration . . . . . . . . 18 Tiloca & Höglund Expires 17 July 2024 [Page 2] Internet-Draft CoRAL Admin Interface for the OSCORE GM January 2024 6.7.1. Effects on Joining Nodes . . . . . . . . . . . . . . 20 6.7.2. Effects on the Group Members . . . . . . . . . . . . 20 6.8. Delete a Group Configuration . . . . . . . . . . . . . . 20 6.8.1. Effects on the Group Members . . . . . . . . . . . . 21 7. Support of Top-Level Link Elements . . . . . . . . . . . . . 21 8. Error Identifiers . . . . . . . . . . . . . . . . . . . . . . 22 9. Security Considerations . . . . . . . . . . . . . . . . . . . 22 10. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 22 11. References . . . . . . . . . . . . . . . . . . . . . . . . . 22 11.1. Normative References . . . . . . . . . . . . . . . . . . 22 11.2. Informative References . . . . . . . . . . . . . . . . . 25 Appendix A. Shared item tables for Packed CBOR . . . . . . . . . 26 A.1. Compression of CoRAL predicates . . . . . . . . . . . . . 26 A.2. Compression of Values of the rt= Target Attribute . . . . 28 Appendix B. Document Updates . . . . . . . . . . . . . . . . . . 28 B.1. Version -00 to -01 . . . . . . . . . . . . . . . . . . . 28 B.2. Version -00 . . . . . . . . . . . . . . . . . . . . . . . 29 Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . 29 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 29 1. Introduction The Constrained Application Protocol (CoAP) [RFC7252] can also be used for group communication [I-D.ietf-core-groupcomm-bis], where messages are exchanged between members of a group, e.g., over IP multicast. Applications relying on CoAP can achieve end-to-end security at the application layer by using Object Security for Constrained RESTful Environments (OSCORE) [RFC8613], and especially Group OSCORE [I-D.ietf-core-oscore-groupcomm] in group communication scenarios. When group communication for CoAP is protected with Group OSCORE, nodes are required to explicitly join the correct OSCORE group. To this end, a joining node interacts with a Group Manager (GM) entity responsible for that group, and retrieves the required keying material to securely communicate with other group members using Group OSCORE. The method in [I-D.ietf-ace-key-groupcomm-oscore] specifies how nodes can join an OSCORE group through the respective Group Manager. Such a method builds on the ACE framework for Authentication and Authorization [RFC9200], so ensuring a secure joining process as well as authentication and authorization of joining nodes (clients) at the Group Manager (resource server). Tiloca & Höglund Expires 17 July 2024 [Page 3] Internet-Draft CoRAL Admin Interface for the OSCORE GM January 2024 [I-D.ietf-ace-oscore-gm-admin] specifies a RESTful admin interface at the Group Manager, intended for an Administrator as a separate entity external to the Group Manager and its application. The interface allows the Administrator to create and delete OSCORE groups, as well as to configure and update their configuration. This document builds on [I-D.ietf-ace-oscore-gm-admin], and specifies how an Administrator interacts with the same RESTful admin interface by using the Constrained RESTful Application Language (CoRAL) [I-D.ietf-core-coral]. Compared to [I-D.ietf-ace-oscore-gm-admin], there is no change in the admin interface and its operations, nor in the way the group configurations are organized and represented. Interaction examples using Packed CBOR [I-D.ietf-cbor-packed] are provided, and are expressed in CBOR diagnostic notation [RFC8949]. Section 1.2 provides the notation and assumptions used in the examples. The ACE framework is used to ensure authentication and authorization of the Administrator (client) at the Group Manager (resource server). In order to achieve communication security, proof-of-possession and server authentication, the Administrator and the Group Manager leverage protocol-specific transport profiles of ACE, such as [RFC9202][RFC9203]. These include also possible forthcoming transport profiles that comply with the requirements in Appendix C of [RFC9200]. 1.1. Terminology 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. Readers are expected to be familiar with the terms and concepts from the following specifications. * CBOR [RFC8949], Packed CBOR [I-D.ietf-cbor-packed], and COSE [RFC9052][RFC9053]. * The Constrained RESTful Application Language (CoRAL) [I-D.ietf-core-coral] and Constrained Resource Identifiers (CRIs) [I-D.ietf-core-href]. * The CoAP protocol [RFC7252], also in group communication scenarios [I-D.ietf-core-groupcomm-bis]. These include the concepts of: Tiloca & Höglund Expires 17 July 2024 [Page 4] Internet-Draft CoRAL Admin Interface for the OSCORE GM January 2024 - "application group", as a set of CoAP nodes that share a common set of resources; and of - "security group", as a set of CoAP nodes that share the same security material, and use it to protect and verify exchanged messages. * The OSCORE [RFC8613] and Group OSCORE [I-D.ietf-core-oscore-groupcomm] security protocols. These especially include the concepts of: - Group Manager, as the entity responsible for a set of OSCORE groups where communications among members are secured using Group OSCORE. An OSCORE group is used as security group for one or many application groups. - Authentication credential, as the set of information associated with an entity, including that entity's public key and parameters associated with the public key. Examples of authentication credentials are CBOR Web Tokens (CWTs) and CWT Claims Sets (CCSs) [RFC8392], X.509 certificates [RFC5280] and C509 certificates [I-D.ietf-cose-cbor-encoded-cert]. * The ACE framework for authentication and authorization [RFC9200]. The terminology for entities in the considered architecture is defined in OAuth 2.0 [RFC6749]. In particular, this includes Client (C), Resource Server (RS), and Authorization Server (AS). * The management of keying material for groups in ACE [I-D.ietf-ace-key-groupcomm] and specifically for OSCORE groups [I-D.ietf-ace-key-groupcomm-oscore]. These include the concept of group-membership resource hosted by the Group Manager, that new members access to join the OSCORE group, while current members can access to retrieve updated keying material. Readers are also expected to be familiar with the terms and concepts used in [I-D.ietf-ace-oscore-gm-admin], with particular reference to: "Administrator", "group name", "group-collection resource", and "group-configuration resource". Like in [I-D.ietf-ace-oscore-gm-admin], the url-path to a group- configuration resource has GROUPNAME as last segment, with GROUPNAME the invariant group name assigned upon its creation. Building on the considered url-path of the group-collection resource, this document uses /manage/GROUPNAME as the url-path of a group-configuration resource; implementations are not required to use this name, and can define their own instead. Tiloca & Höglund Expires 17 July 2024 [Page 5] Internet-Draft CoRAL Admin Interface for the OSCORE GM January 2024 Note that, unless otherwise indicated, the term "endpoint" is used here following its OAuth definition, aimed at denoting resources such as /token and /introspect at the AS, and /authz-info at the RS. This document does not use the CoAP definition of "endpoint", which is "An entity participating in the CoAP protocol". 1.2. Notation and Assumptions in the Examples As per Section 2.4 of [I-D.ietf-core-coral], CoRAL expresses Uniform Resource Identifiers (URIs) [RFC3986] as Constrained Resource Identifier (CRI) references [I-D.ietf-core-href]. The examples in this document use the following notation. When using the CURIE syntax [CURIE-20101216], the following applies. * 'core.osc.gcoll' stands for http://coreapps.org/core.osc.gcoll# * 'core.osc.gconf' stands for http://coreapps.org/core.osc.gconf# * 'linkformat' stands for http://www.iana.org/assignments/linkformat This URI is to be defined with IANA, together with other URIs that build on it through further path segments, e.g., http://www.iana.org/assignments/linkformat/rt When using a URI http://www.iana.org/assignments/linkformat/SEG1/SEG2 * The path segment SEG1 is the name of a web link target attribute. Names of target attributes used in Link Format [RFC6690] are expected to be coordinated through the "Target Attributes" registry defined in [I-D.ietf-core-target-attr]. * The path segment SEG2 is the value of the target attribute. The application-extension identifier "cri" defined in Appendix C of [I-D.ietf-core-href] is used to notate a CBOR Extended Diagnostic Notation (EDN) literal for a CRI or CRI reference. This format is not expected to be sent over the network. Packed CBOR [I-D.ietf-cbor-packed] is also used, thus reducing representation size. The examples especially refer to the values from the two shared item tables in Appendix A. Finally, the examples consider a Group Manager with address [2001:db8::ab], and use the CoAP Content-Format ID 65087 for the media-type application/coral+cbor. Tiloca & Höglund Expires 17 July 2024 [Page 6] Internet-Draft CoRAL Admin Interface for the OSCORE GM January 2024 2. Group Administration The group administration is enforced as defined in Section 2 of [I-D.ietf-ace-oscore-gm-admin]. 2.1. Managing OSCORE Groups The same resource model defined in Section 2.1 of [I-D.ietf-ace-oscore-gm-admin] as based on a group-collection resource and multiple group-configuration resources is used in this document. When accessing such resources, the Administrator relies on the same interface defined in Section 6 of [I-D.ietf-ace-oscore-gm-admin], for which differences that apply when using CoRAL are compiled in Section 6 of this document. 2.2. Collection Representation A collection of group configurations is represented as a CoRAL document containing the list of corresponding group-configuration resources. Each group configuration is represented as a top-level link element, with the URI of the group-configuration resource as link target, and with http://coreapps.org/core.osc.gcoll#item as relation type. 2.3. Discovery The Administrator can discover the group-collection resource from a Resource Directory (see, for instance [I-D.hartke-t2trg-coral-reef]) or from .well-known/core, by using the resource type "core.osc.gcoll" defined in Section 10.3 of [I-D.ietf-ace-oscore-gm-admin]. The Administrator can discover group-configuration resources for the group-collection resource as specified in Section 6.1 and Section 6.2. 3. Format of Scope In order to express authorization information for the Administrator (see Section 4), the same format and encoding of scope defined in Section 3 of [I-D.ietf-ace-oscore-gm-admin] is used, as relying on the Authorization Information Format (AIF) [RFC9237] and the extended AIF data model AIF-OSCORE-GROUPCOMM defined in Section 3 of [I-D.ietf-ace-key-groupcomm-oscore]. Tiloca & Höglund Expires 17 July 2024 [Page 7] Internet-Draft CoRAL Admin Interface for the OSCORE GM January 2024 4. Getting Access to the Group Manager All communications between the involved entities rely on the CoAP protocol and MUST be secured. In particular, communications between the Administrator and the Group Manager leverage protocol-specific transport profiles of ACE to achieve communication security, proof-of-possession and server authentication. To this end, the AS may explicitly signal the specific transport profile to use, consistently with requirements and assumptions defined in the ACE framework [RFC9200]. With reference to the AS, communications between the Administrator and the AS (/token endpoint) as well as between the Group Manager and the AS (/introspect endpoint) can be secured by different means, for instance using DTLS [RFC9147] or OSCORE [RFC8613]. Further details on how the AS secures communications (with the Administrator and the Group Manager) depend on the specifically used transport profile of ACE, and are out of the scope of this document. The Administrator requests access to the Group Manager as per Steps 1-3 in Section 4 of [I-D.ietf-ace-oscore-gm-admin]. The Administrator accesses the admin interface at the Group Manager as per Step 4 in Section 4 of [I-D.ietf-ace-oscore-gm-admin], with the difference that administrative operations are performed not as defined in Section 6 of [I-D.ietf-ace-oscore-gm-admin], but instead as defined in Section 6 of this document. 4.1. Multiple Administrators for the Same OSCORE Group What is defined in Section 4.1 of [I-D.ietf-ace-oscore-gm-admin] holds for this document, with the following difference. The Administrator performs administrative operations at the Group Manager not as defined in Section 6 of [I-D.ietf-ace-oscore-gm-admin], but instead as defined in Section 6 of this document. 5. Group Configurations A group configuration consists of a set of parameters. 5.1. Group Configuration Representation The same group configuration representation defined in Section 5.1 of [I-D.ietf-ace-oscore-gm-admin] is used, as including configuration properties and status properties. Tiloca & Höglund Expires 17 July 2024 [Page 8] Internet-Draft CoRAL Admin Interface for the OSCORE GM January 2024 5.1.1. Configuration Properties The same configuration properties defined in Section 5.1.1 of [I-D.ietf-ace-oscore-gm-admin] are used. 5.1.2. Status Properties The same status properties defined in Section 5.1.2 of [I-D.ietf-ace-oscore-gm-admin] are used. 5.2. Default Values The Group manager refers to the same default values defined in Section 5.2 of [I-D.ietf-ace-oscore-gm-admin]. 6. Interactions with the Group Manager The same as defined in Section 6 of [I-D.ietf-ace-oscore-gm-admin] holds, with the following differences. * The Content-Format in messages containing a payload is set to application/coral+cbor, defined in Section 7.2 of [I-D.ietf-core-coral]. * The parameters 'sign_params', 'ecdh_params', 'app_groups' and 'group_policies' are referred to as "structured parameters". * If a message payload specifies a link element corresponding to a structured parameter, then: - The payload MUST NOT include any link element corresponding to an inner information element of that structured parameter. - The link element MUST have the link target with value "false" (0xf4) for indicating the structured parameter with no elements. Editor's note: this should change to using an empty CBOR array or an empty CBOR map as appropriate, once this is made explicitly possible in the binary format of link items in CoRAL (see Section 3.1.4 of [I-D.ietf-core-coral]). * If a message payload specifies an information element of a structured parameter from the group configuration, then that information element MUST be specified by means of the corresponding link element. Tiloca & Höglund Expires 17 July 2024 [Page 9] Internet-Draft CoRAL Admin Interface for the OSCORE GM January 2024 6.1. Retrieve the Full List of Group Configurations This operation MUST be supported by the Group Manager and an Administrator. The Administrator can send a GET request to the group-collection resource, in order to retrieve a list of the existing OSCORE groups at the Group Manager. The same as defined in Section 6.1 of [I-D.ietf-ace-oscore-gm-admin] holds. An example of message exchange is shown below. => 0.01 GET Uri-Path: manage <= 2.05 Content Content-Format: 65087 (application/coral+cbor) Payload: [ [1, cri'coap://[2001:db8::ab]/manage'], [2, 6(17) / item 50 for core.osc.gcoll:item /, cri'/gp1', [ [2, simple(6) / item 6 for linkformat:rt /, 6(-200) / item 415 for cri'http://www.iana.org/assignments /linkformat/rt/core.osc.gconf' /] ]], [2, 6(17) / item 50 for core.osc.gcoll:item /, cri'/gp2', [ [2, simple(6) / item 6 for linkformat:rt /, 6(-200) / item 415 for cri'http://www.iana.org/assignments /linkformat/rt/core.osc.gconf' /] ]], [2, 6(17) / item 50 for core.osc.gcoll:item /, cri'/gp3', [ [2, simple(6) / item 6 for linkformat:rt /, 6(-200) / item 415 for cri'http://www.iana.org/assignments /linkformat/rt/core.osc.gconf' /] ]] ] 6.2. Retrieve a List of Group Configurations by Filters This operation MUST be supported by the Group Manager and MAY be supported by an Administrator. Tiloca & Höglund Expires 17 July 2024 [Page 10] Internet-Draft CoRAL Admin Interface for the OSCORE GM January 2024 The Administrator can send a FETCH request to the group-collection resource, in order to retrieve a list of the existing OSCORE groups that fully match a set of specified filter criteria. The same as defined in Section 6.2 of [I-D.ietf-ace-oscore-gm-admin] holds, with the following differences. * The filter criteria are specified in the request payload with top- level link elements, each of which corresponds to an entry of the group configuration (see Section 5.1), with the exception of non- empty structured parameters. * If names of application groups are used as filter criteria, each element of the 'app_groups' array from the status properties is included as a separate link element with name 'app_group'. * With the exception of the 'app_group' element, a valid request MUST NOT include the same element multiple times. Element values are the ones admitted for the corresponding labels in the POST request for creating a group configuration (see Section 6.3). An example of message exchange is shown below. Tiloca & Höglund Expires 17 July 2024 [Page 11] Internet-Draft CoRAL Admin Interface for the OSCORE GM January 2024 => 0.05 FETCH Uri-Path: manage Content-Format: 65087 (application/coral+cbor) Payload: [ [2, 6(27) / item 70 for core.osc.gconf:group_mode /, true], [2, 6(-28) / item 71 for core.osc.gconf:gp_enc_alg /, 10], [2, 6(26) / item 68 for core.osc.gconf:hkdf /, 5] ] <= 2.05 Content Content-Format: 65087 (application/coral+cbor) Payload: [ [1, cri'coap://[2001:db8::ab]/manage'], [2, 6(17) / item 50 for core.osc.gcoll:item /, cri'/gp1', [ [2, simple(6) / item 6 for linkformat:rt /, 6(-200) / item 415 for cri'http://www.iana.org/assignments /linkformat/rt/core.osc.gconf' /] ]], [2, 6(17) / item 50 for core.osc.gcoll:item /, cri'/gp2', [ [2, simple(6) / item 6 for linkformat:rt /, 6(-200) / item 415 for cri'http://www.iana.org/assignments /linkformat/rt/core.osc.gconf' /] ]], [2, 6(17) / item 50 for core.osc.gcoll:item /, cri'/gp3', [ [2, simple(6) / item 6 for linkformat:rt /, 6(-200) / item 415 for cri'http://www.iana.org/assignments /linkformat/rt/core.osc.gconf' /] ]] ] 6.3. Create a New Group Configuration This operation MUST be supported by the Group Manager and an Administrator. The Administrator can send a POST request to the group-collection resource, in order to create a new OSCORE group at the Group Manager. The same as defined in Section 6.3 of [I-D.ietf-ace-oscore-gm-admin] holds, with the following differences. Tiloca & Höglund Expires 17 July 2024 [Page 12] Internet-Draft CoRAL Admin Interface for the OSCORE GM January 2024 * In the request payload, each link element corresponds to an entry of the group configuration (see Section 5.1), with the exception of non-empty structured parameters. * In the request payload, each element of the 'app_groups' array from the status properties is included as a separate element with name 'app_group'. * The Group Manager MUST respond with a 4.00 (Bad Request) response if any link element is specified multiple times in the payload of the POST request, with the exception of the 'app_group' link element. * The response payload includes one link element for each specified parameter, with the exception of non-empty structured parameters. * In the response payload, each element of the 'app_groups' array from the status properties is included as a separate element with name 'app_group'. * If the Administrator performs the registration of the group- membership resource to a Resource Directory on behalf of the Group Manager, then the names of the application groups using the OSCORE group MUST take the values possibly specified by the different 'app_group' link elements in the POST request. An example of message exchange is shown below. Tiloca & Höglund Expires 17 July 2024 [Page 13] Internet-Draft CoRAL Admin Interface for the OSCORE GM January 2024 => 0.02 POST Uri-Path: manage Content-Format: 65087 (application/coral+cbor) Payload: [ [2, 6(-28) / item 71 for core.osc.gconf:gp_enc_alg /, 10], [2, 6(26) / item 68 for core.osc.gconf:hkdf /, 5], [2, 6(-31) / item 77 for core.osc.gconf:pairwise_mode /, true], [2, 6(-36) / item 87 for core.osc.gconf:active /, true], [2, 6(36) / item 88 for core.osc.gconf:group_name /, "gp4"], [2, 6(-37) / item 89 for core.osc.gconf:group_title /, "rooms 1 and 2"], [2, 6(39) / item 94 for core.osc.gconf:app_group /, "room 1"], [2, 6(39) / item 94 for core.osc.gconf:app_group /, "room 2"], [2, 6(43) / item 102 for core.osc.gconf:as_uri /, cri'coap://as.example.com/token'] ] <= 2.01 Created Location-Path: manage Location-Path: gp4 Content-Format: 65087 (application/coral+cbor) Payload: [ [2, 6(36) / item 88 for core.osc.gconf:group_name /, "gp4"], [2, 6(-41) / item 97 for core.osc.gconf:joining_uri /, cri'coap://[2001:db8::ab]/ace-group/gp4/'], [2, 6(43) / item 102 for core.osc.gconf:as_uri /, cri'coap://as.example.com/token'] ] 6.4. Retrieve a Group Configuration This operation MUST be supported by the Group Manager and an Administrator. The Administrator can send a GET request to the group-configuration resource manage/GROUPNAME associated with an OSCORE group with group name GROUPNAME, in order to retrieve the complete current configuration of that group. The same as defined in Section 6.4 of [I-D.ietf-ace-oscore-gm-admin] holds, with the following differences. Tiloca & Höglund Expires 17 July 2024 [Page 14] Internet-Draft CoRAL Admin Interface for the OSCORE GM January 2024 * The response payload includes one link element for each entry of the group configuration (see Section 5.1), with the exception of non-empty status parameters. * Each element of the 'app_groups' array from the status properties is included as a separate link element with name 'app_group'. An example of message exchange is shown below. => 0.01 GET Uri-Path: manage Uri-Path: gp4 <= 2.05 Content Content-Format: 65087 (application/coral+cbor) Payload: [ [2, 6(26) / item 68 for core.osc.gconf:hkdf /, 5], [2, 6(-27) / item 69 for core.osc.gconf:cred_fmt /, 33], [2, 6(27) / item 70 for core.osc.gconf:group_mode /, true], [2, 6(-28) / item 71 for core.osc.gconf:gp_enc_alg /, 10], [2, 6(28) / item 72 for core.osc.gconf:sign_alg /, -8], [2, 6(29) / item 74 for core.osc.gconf:sign_params.alg_capab.key_type /, 1], [2, 6(-30) / item 75 for core.osc.gconf:sign_params.key_type_capab.key_type /, 1], [2, 6(30) / item 76 for core.osc.gconf:sign_params.key_type_capab.curve /, 6], [2, 6(-31) / item 77 for core.osc.gconf:pairwise_mode /, true], [2, 6(31) / item 78 for core.osc.gconf:alg /, 10], [2, 6(-32) / item 79 for core.osc.gconf:ecdh_alg /, -27], [2, 6(-33) / item 81 for core.osc.gconf:ecdh_params.alg_capab.key_type /, 1], [2, 6(33) / item 82 for core.osc.gconf:ecdh_params.key_type_capab.key_type /, 1], [2, 6(-34) / item 83 for core.osc.gconf:ecdh_params.key_type_capab.curve /, 6], [2, 6(34) / item 84 for core.osc.gconf:det_req /, false], [2, 6(35) / item 86 for core.osc.gconf:rt /, "core.osc.gconf"], [2, 6(-36) / item 87 for core.osc.gconf:active /, true], [2, 6(36) / item 88 for core.osc.gconf:group_name /, "gp4"], [2, 6(-37) / item 89 for core.osc.gconf:group_title /, "rooms 1 and 2"], [2, 6(37) / item 90 for core.osc.gconf:ace_groupcomm_profile /, "coap_group_oscore_app"], [2, 6(-38) / item 91 for core.osc.gconf:max_stale_sets /, 3], Tiloca & Höglund Expires 17 July 2024 [Page 15] Internet-Draft CoRAL Admin Interface for the OSCORE GM January 2024 [2, 6(38) / item 92 for core.osc.gconf:exp /, 1360289224], [2, 6(-39) / item 93 for core.osc.gconf:gid_reuse /, false], [2, 6(39) / item 94 for core.osc.gconf:app_group /, "room 1"], [2, 6(39) / item 94 for core.osc.gconf:app_group /, "room 2"], [2, 6(-41) / item 97 for core.osc.gconf:joining_uri /, cri'coap://[2001:db8::ab]/ace-group/gp4/'], [2, 6(43) / item 102 for core.osc.gconf:as_uri /, cri'coap://as.example.com/token'] ] 6.5. Retrieve Part of a Group Configuration by Filters This operation MUST be supported by the Group Manager and MAY be supported by an Administrator. The Administrator can send a FETCH request to the group-configuration resource manage/GROUPNAME associated with an OSCORE group with group name GROUPNAME, in order to retrieve part of the current configuration of that group. The same as defined in Section 6.5 of [I-D.ietf-ace-oscore-gm-admin] holds, with the following differences. * The request payload includes one link element for each requested configuration parameter or status parameter of the current group configuration (see Section 5.1). All the specified link elements MUST have the link target with value "null". * The request payload MUST NOT include any link element corresponding to an inner information element of a structured parameter. * The response payload includes the requested configuration parameters and status parameters, and is formatted as in the response payload of a GET request to a group-configuration resource (see Section 6.4). If the request payload specifies a parameter that is not included in the group configuration, then the response payload MUST NOT include a corresponding link element. An example of message exchange is shown below. Tiloca & Höglund Expires 17 July 2024 [Page 16] Internet-Draft CoRAL Admin Interface for the OSCORE GM January 2024 => 0.05 FETCH Uri-Path: manage Uri-Path: gp4 Content-Format: 65087 (application/coral+cbor) Payload: [ [2, 6(-28) / item 71 for core.osc.gconf:gp_enc_alg /, null], [2, 6(26) / item 68 for core.osc.gconf:hkdf /, null], [2, 6(-31) / item 77 for core.osc.gconf:pairwise_mode /, null], [2, 6(-36) / item 87 for core.osc.gconf:active /, null], [2, 6(-37) / item 89 for core.osc.gconf:group_title /, null], [2, 6(41) / item 98 for core.osc.gconf:app_groups /, null] ] <= 2.05 Content Content-Format: 65087 (application/coral+cbor) Payload: [ [2, 6(-28) / item 71 for core.osc.gconf:gp_enc_alg /, 10], [2, 6(26) / item 68 for core.osc.gconf:hkdf /, 5], [2, 6(-31) / item 77 for core.osc.gconf:pairwise_mode /, true], [2, 6(-36) / item 87 for core.osc.gconf:active /, true], [2, 6(-37) / item 89 for core.osc.gconf:group_title /, "rooms 1 and 2"], [2, 6(39) / item 94 for core.osc.gconf:app_group /, "room 1"], [2, 6(39) / item 94 for core.osc.gconf:app_group /, "room 2"] ] 6.6. Overwrite a Group Configuration This operation MAY be supported by the Group Manager and an Administrator. The Administrator can send a PUT request to the group-configuration resource manage/GROUPNAME associated with an OSCORE group with group name GROUPNAME, in order to overwrite the current configuration of that group with a new one. The same as defined in Section 6.6 of [I-D.ietf-ace-oscore-gm-admin] holds, with the following difference. Tiloca & Höglund Expires 17 July 2024 [Page 17] Internet-Draft CoRAL Admin Interface for the OSCORE GM January 2024 * If the Administrator updates the registration of the group- membership resource in the Resource Directory on behalf of the Group Manager, then the names of the application groups using the OSCORE group MUST take the values possibly specified by the different 'app_group' link elements in the PUT request. An example of message exchange is shown below. => 0.03 PUT Uri-Path: manage Uri-Path: gp4 Content-Format: 65087 (application/coral+cbor) Payload: [ [2, 6(-28) / item 71 for core.osc.gconf:gp_enc_alg /, 11], [2, 6(26) / item 68 for core.osc.gconf:hkdf /, 5] ] <= 2.04 Changed Content-Format: 65087 (application/coral+cbor) Payload: [ [2, 6(36) / item 88 for core.osc.gconf:group_name /, "gp4"], [2, 6(-41) / item 97 for core.osc.gconf:joining_uri /, cri'coap://[2001:db8::ab]/ace-group/gp4/'], [2, 6(43) / item 102 for core.osc.gconf:as_uri /, cri'coap://as.example.com/token'] ] 6.6.1. Effects on Joining Nodes The same as defined in Section 6.6.1 of [I-D.ietf-ace-oscore-gm-admin] holds. 6.6.2. Effects on the Group Members The same as defined in Section 6.6.2 of [I-D.ietf-ace-oscore-gm-admin] holds. 6.7. Selective Update of a Group Configuration This operation MAY be supported by the Group Manager and an Administrator. Tiloca & Höglund Expires 17 July 2024 [Page 18] Internet-Draft CoRAL Admin Interface for the OSCORE GM January 2024 The Administrator can send a PATCH/iPATCH request [RFC8132] to the group-configuration resource manage/GROUPNAME associated with an OSCORE group with group name GROUPNAME, in order to update the value of only part of the group configuration. The same as defined in Section 6.7 of [I-D.ietf-ace-oscore-gm-admin] holds, with the following differences. * If the request payload specifies names of application groups to be removed from or added to the 'app_groups' status parameter, then such names are specified by means of the following top-level link elements. - 'app_group_del', with value a text string specifying the name of an application group to remove from the 'app_groups' status parameter. This link element can be included multiple times. - 'app_group_add', with value a text string specifying the name of an application group to add to the 'app_groups' status parameter. This link element can be included multiple times. The Group Manager MUST respond with a 4.00 (Bad Request) response, in case the request payload includes both any 'app_group' link element as well as any 'app_group_del' and/or 'app_group_add' link element. * The Group Manager MUST respond with a 4.00 (Bad Request) response, if the request payload includes no link elements. * When the request uses specifically the iPATCH method, the Group Manager MUST respond with a 4.00 (Bad Request) response, in case any link element 'app_group_del' and/or 'app_group_add' is included. * When updating the 'app_groups' status parameter by difference, the Group Manager: - Deletes from the 'app_groups' status parameter the names of the application groups specified in the different 'app_group_del' link elements. - Adds to the 'app_groups' status parameter the names of the application groups specified in the different 'app_group_add' link elements. An example of message exchange is shown below. Tiloca & Höglund Expires 17 July 2024 [Page 19] Internet-Draft CoRAL Admin Interface for the OSCORE GM January 2024 => 0.06 PATCH Uri-Path: manage Uri-Path: gp4 Content-Format: 65087 (application/coral+cbor) Payload: [ [2, 6(-28) / item 71 for core.osc.gconf:gp_enc_alg /, 10], [2, 6(-40) / item 95 for core.osc.gconf:app_group_del /, "room1"], [2, 6(40) / item 96 for core.osc.gconf:app_group_add /, "room3"], [2, 6(40) / item 96 for core.osc.gconf:app_group_add /, "room4"] ] <= 2.04 Changed Content-Format: 65087 (application/coral+cbor) Payload: [ [2, 6(36) / item 88 for core.osc.gconf:group_name /, "gp4"], [2, 6(-41) / item 97 for core.osc.gconf:joining_uri /, cri'coap://[2001:db8::ab]/ace-group/gp4/'], [2, 6(43) / item 102 for core.osc.gconf:as_uri /, cri'coap://as.example.com/token'] ] 6.7.1. Effects on Joining Nodes The same as defined in Section 6.7.1 of [I-D.ietf-ace-oscore-gm-admin] holds. 6.7.2. Effects on the Group Members The same as defined in Section 6.7.2 of [I-D.ietf-ace-oscore-gm-admin] holds. 6.8. Delete a Group Configuration This operation MUST be supported by the Group Manager and an Administrator. The Administrator can send a DELETE request to the group- configuration resource manage/GROUPNAME associated with an OSCORE group with group name GROUPNAME, in order to delete that OSCORE group. Tiloca & Höglund Expires 17 July 2024 [Page 20] Internet-Draft CoRAL Admin Interface for the OSCORE GM January 2024 The same as defined in Section 6.8 of [I-D.ietf-ace-oscore-gm-admin] holds. 6.8.1. Effects on the Group Members The same as defined in Section 6.8.1 of [I-D.ietf-ace-oscore-gm-admin] holds. 7. Support of Top-Level Link Elements Consistently with Section 7 of [I-D.ietf-ace-oscore-gm-admin], the following holds for the Group Manager. * It MUST support the top-level link elements 'error', 'error_description', 'ace_groupcomm_profile', 'exp', and 'group_policies' corresponding to the ACE Groupcomm Parameters defined in Section 8 of [I-D.ietf-ace-key-groupcomm]. This is consistent with what is defined in Section 8 of [I-D.ietf-ace-key-groupcomm] for the Key Distribution Center, of which the Group Manager defined in [I-D.ietf-ace-key-groupcomm-oscore] is a specific instance. * It MUST support the top-level link elements corresponding to all the parameters listed in Section 7 of [I-D.ietf-ace-oscore-gm-admin], with the exception of 'app_groups_diff' that MUST be supported only if the Group Manager supports the selective update of a group configuration (see Section 6.7). The following holds for an Administrator. * It MUST support the top-level link elements 'error', 'error_description', 'ace_groupcomm_profile', 'exp', and 'group_policies' corresponding to the ACE Groupcomm Parameters defined in Section 8 of [I-D.ietf-ace-key-groupcomm]. * It MUST support the top-level link elements corresponding to all the parameters listed in Section 7 of [I-D.ietf-ace-oscore-gm-admin], with the following exceptions. - 'conf_filter', which MUST be supported only if the Administrator supports the partial retrieval of a group configuration by filters (see Section 6.5). - 'app_groups_diff' parameter, which MUST be supported only if the Administrator supports the selective update of a group configuration (see Section 6.7). Tiloca & Höglund Expires 17 July 2024 [Page 21] Internet-Draft CoRAL Admin Interface for the OSCORE GM January 2024 8. Error Identifiers If the Group Manager sends an error response including the link element 'error', this can specify any of the values defined in Section 8 of [I-D.ietf-ace-oscore-gm-admin]. The same guidelines in Section 8 of [I-D.ietf-ace-oscore-gm-admin] for the Administrator to handle such error identifiers holds. 9. Security Considerations Security considerations are inherited from the ACE framework for Authentication and Authorization [RFC9200], and from the specific transport profile of ACE used between the Administrator and the Group Manager, such as [RFC9202] and [RFC9203]. The same security considerations from [I-D.ietf-ace-key-groupcomm] and [I-D.ietf-ace-key-groupcomm-oscore] also apply, with particular reference to the process of rekeying OSCORE groups. The same security considerations from [I-D.ietf-ace-oscore-gm-admin] also apply, as well for the security considerations for CoRAL [I-D.ietf-core-coral] and Packed CBOR [I-D.ietf-cbor-packed]. 10. IANA Considerations This document has no actions for IANA. 11. References 11.1. Normative References [CURIE-20101216] Birbeck, M. and S. McCarron, "CURIE Syntax 1.0 - A syntax for expressing Compact URIs - W3C Working Group Note", 16 December 2010, . [I-D.ietf-ace-key-groupcomm] Palombini, F. and M. Tiloca, "Key Provisioning for Group Communication using ACE", Work in Progress, Internet- Draft, draft-ietf-ace-key-groupcomm-17, 6 October 2023, . [I-D.ietf-ace-key-groupcomm-oscore] Tiloca, M., Park, J., and F. Palombini, "Key Management for OSCORE Groups in ACE", Work in Progress, Internet- Tiloca & Höglund Expires 17 July 2024 [Page 22] Internet-Draft CoRAL Admin Interface for the OSCORE GM January 2024 Draft, draft-ietf-ace-key-groupcomm-oscore-16, 6 March 2023, . [I-D.ietf-ace-oscore-gm-admin] Tiloca, M., Höglund, R., Van der Stok, P., and F. Palombini, "Admin Interface for the OSCORE Group Manager", Work in Progress, Internet-Draft, draft-ietf-ace-oscore- gm-admin-10, 23 October 2023, . [I-D.ietf-cbor-packed] Bormann, C., "Packed CBOR", Work in Progress, Internet- Draft, draft-ietf-cbor-packed-10, 9 January 2024, . [I-D.ietf-core-coral] Amsüss, C. and T. Fossati, "The Constrained RESTful Application Language (CoRAL)", Work in Progress, Internet- Draft, draft-ietf-core-coral-05, 7 March 2022, . [I-D.ietf-core-groupcomm-bis] Dijk, E., Wang, C., and M. Tiloca, "Group Communication for the Constrained Application Protocol (CoAP)", Work in Progress, Internet-Draft, draft-ietf-core-groupcomm-bis- 10, 23 October 2023, . [I-D.ietf-core-href] Bormann, C. and H. Birkholz, "Constrained Resource Identifiers", Work in Progress, Internet-Draft, draft- ietf-core-href-14, 9 January 2024, . [I-D.ietf-core-oscore-groupcomm] Tiloca, M., Selander, G., Palombini, F., Mattsson, J. P., and J. Park, "Group Object Security for Constrained RESTful Environments (Group OSCORE)", Work in Progress, Internet-Draft, draft-ietf-core-oscore-groupcomm-20, 2 September 2023, . Tiloca & Höglund Expires 17 July 2024 [Page 23] Internet-Draft CoRAL Admin Interface for the OSCORE GM January 2024 [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997, . [RFC3986] Berners-Lee, T., Fielding, R., and L. Masinter, "Uniform Resource Identifier (URI): Generic Syntax", STD 66, RFC 3986, DOI 10.17487/RFC3986, January 2005, . [RFC6690] Shelby, Z., "Constrained RESTful Environments (CoRE) Link Format", RFC 6690, DOI 10.17487/RFC6690, August 2012, . [RFC6749] Hardt, D., Ed., "The OAuth 2.0 Authorization Framework", RFC 6749, DOI 10.17487/RFC6749, October 2012, . [RFC7252] Shelby, Z., Hartke, K., and C. Bormann, "The Constrained Application Protocol (CoAP)", RFC 7252, DOI 10.17487/RFC7252, June 2014, . [RFC8132] van der Stok, P., Bormann, C., and A. Sehgal, "PATCH and FETCH Methods for the Constrained Application Protocol (CoAP)", RFC 8132, DOI 10.17487/RFC8132, April 2017, . [RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, May 2017, . [RFC8613] Selander, G., Mattsson, J., Palombini, F., and L. Seitz, "Object Security for Constrained RESTful Environments (OSCORE)", RFC 8613, DOI 10.17487/RFC8613, July 2019, . [RFC8949] Bormann, C. and P. Hoffman, "Concise Binary Object Representation (CBOR)", STD 94, RFC 8949, DOI 10.17487/RFC8949, December 2020, . [RFC9052] Schaad, J., "CBOR Object Signing and Encryption (COSE): Structures and Process", STD 96, RFC 9052, DOI 10.17487/RFC9052, August 2022, . Tiloca & Höglund Expires 17 July 2024 [Page 24] Internet-Draft CoRAL Admin Interface for the OSCORE GM January 2024 [RFC9053] Schaad, J., "CBOR Object Signing and Encryption (COSE): Initial Algorithms", RFC 9053, DOI 10.17487/RFC9053, August 2022, . [RFC9200] Seitz, L., Selander, G., Wahlstroem, E., Erdtman, S., and H. Tschofenig, "Authentication and Authorization for Constrained Environments Using the OAuth 2.0 Framework (ACE-OAuth)", RFC 9200, DOI 10.17487/RFC9200, August 2022, . [RFC9202] Gerdes, S., Bergmann, O., Bormann, C., Selander, G., and L. Seitz, "Datagram Transport Layer Security (DTLS) Profile for Authentication and Authorization for Constrained Environments (ACE)", RFC 9202, DOI 10.17487/RFC9202, August 2022, . [RFC9203] Palombini, F., Seitz, L., Selander, G., and M. Gunnarsson, "The Object Security for Constrained RESTful Environments (OSCORE) Profile of the Authentication and Authorization for Constrained Environments (ACE) Framework", RFC 9203, DOI 10.17487/RFC9203, August 2022, . [RFC9237] Bormann, C., "An Authorization Information Format (AIF) for Authentication and Authorization for Constrained Environments (ACE)", RFC 9237, DOI 10.17487/RFC9237, August 2022, . 11.2. Informative References [I-D.hartke-t2trg-coral-reef] Hartke, K., "Resource Discovery in Constrained RESTful Environments (CoRE) using the Constrained RESTful Application Language (CoRAL)", Work in Progress, Internet- Draft, draft-hartke-t2trg-coral-reef-04, 9 May 2020, . [I-D.ietf-core-target-attr] Bormann, C., "CoRE Target Attributes Registry", Work in Progress, Internet-Draft, draft-ietf-core-target-attr-06, 11 October 2023, . [I-D.ietf-cose-cbor-encoded-cert] Mattsson, J. P., Selander, G., Raza, S., Höglund, J., and M. Furuhed, "CBOR Encoded X.509 Certificates (C509 Tiloca & Höglund Expires 17 July 2024 [Page 25] Internet-Draft CoRAL Admin Interface for the OSCORE GM January 2024 Certificates)", Work in Progress, Internet-Draft, draft- ietf-cose-cbor-encoded-cert-07, 20 October 2023, . [RFC5280] Cooper, D., Santesson, S., Farrell, S., Boeyen, S., Housley, R., and W. Polk, "Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) Profile", RFC 5280, DOI 10.17487/RFC5280, May 2008, . [RFC8392] Jones, M., Wahlstroem, E., Erdtman, S., and H. Tschofenig, "CBOR Web Token (CWT)", RFC 8392, DOI 10.17487/RFC8392, May 2018, . [RFC9147] Rescorla, E., Tschofenig, H., and N. Modadugu, "The Datagram Transport Layer Security (DTLS) Protocol Version 1.3", RFC 9147, DOI 10.17487/RFC9147, April 2022, . Appendix A. Shared item tables for Packed CBOR This appendix defines the two shared item tables that the examples in this document refer to for using Packed CBOR [I-D.ietf-cbor-packed]. The application-extension identifier "cri" defined in Appendix C of [I-D.ietf-core-href] is used to notate a CBOR Extended Diagnostic Notation (EDN) literal for a CRI. A.1. Compression of CoRAL predicates The following shared item table is used for compressing CoRAL predicates, as per Section 2.2 of [I-D.ietf-cbor-packed]. +-------+--------------------------------------------------------+ | Index | Item | +-------+--------------------------------------------------------+ | 6 | cri'http://www.iana.org/assignments/linkformat/rt' | +-------+--------------------------------------------------------+ | 50 | cri'http://coreapps.org/core.osc.gcoll#item' | +-------+--------------------------------------------------------+ | 68 | cri'http://coreapps.org/core.osc.gconf#hkdf' | +-------+--------------------------------------------------------+ | 69 | cri'http://coreapps.org/core.osc.gconf#cred_fmt' | +-------+--------------------------------------------------------+ | 70 | cri'http://coreapps.org/core.osc.gconf#group_mode' | +-------+--------------------------------------------------------+ | 71 | cri'http://coreapps.org/core.osc.gconf#gp_enc_alg' | Tiloca & Höglund Expires 17 July 2024 [Page 26] Internet-Draft CoRAL Admin Interface for the OSCORE GM January 2024 +-------+--------------------------------------------------------+ | 72 | cri'http://coreapps.org/core.osc.gconf#sign_alg' | +-------+--------------------------------------------------------+ | 73 | cri'http://coreapps.org/core.osc.gconf#sign_params' | +-------+--------------------------------------------------------+ | 74 | cri'http://coreapps.org/core.osc.gconf#sign_params | | | .alg_capab.key_type' | +-------+--------------------------------------------------------+ | 75 | cri'http://coreapps.org/core.osc.gconf#sign_params | | | .key_type_capab.key_type' | +-------+--------------------------------------------------------+ | 76 | cri'http://coreapps.org/core.osc.gconf#sign_params | | | .key_type_capab.curve' | +-------+--------------------------------------------------------+ | 77 | cri'http://coreapps.org/core.osc.gconf#pairwise_mode' | +-------+--------------------------------------------------------+ | 78 | cri'http://coreapps.org/core.osc.gconf#alg' | +-------+--------------------------------------------------------+ | 79 | cri'http://coreapps.org/core.osc.gconf#ecdh_alg' | +-------+--------------------------------------------------------+ | 80 | cri'http://coreapps.org/core.osc.gconf#ecdh_params' | +-------+--------------------------------------------------------+ | 81 | cri'http://coreapps.org/core.osc.gconf#ecdh_params | | | .alg_capab.key_type' | +-------+--------------------------------------------------------+ | 82 | cri'http://coreapps.org/core.osc.gconf#ecdh_params | | | .key_type_capab.key_type' | +-------+--------------------------------------------------------+ | 83 | cri'http://coreapps.org/core.osc.gconf#ecdh_params | | | .key_type_capab.curve' | +-------+--------------------------------------------------------+ | 84 | cri'http://coreapps.org/core.osc.gconf#det_req' | +-------+--------------------------------------------------------+ | 85 | cri'http://coreapps.org/core.osc.gconf#det_hash_alg' | +-------+--------------------------------------------------------+ | 86 | cri'http://coreapps.org/core.osc.gconf#rt' | +-------+--------------------------------------------------------+ | 87 | cri'http://coreapps.org/core.osc.gconf#active' | +-------+--------------------------------------------------------+ | 88 | cri'http://coreapps.org/core.osc.gconf#group_name' | +-------+--------------------------------------------------------+ | 89 | cri'http://coreapps.org/core.osc.gconf#group_title' | +-------+--------------------------------------------------------+ | 90 | cri'http://coreapps.org/core.osc.gconf | | | #ace_groupcomm_profile' | +-------+--------------------------------------------------------+ | 91 | cri'http://coreapps.org/core.osc.gconf#max_stale_sets' | +-------+--------------------------------------------------------+ Tiloca & Höglund Expires 17 July 2024 [Page 27] Internet-Draft CoRAL Admin Interface for the OSCORE GM January 2024 | 92 | cri'http://coreapps.org/core.osc.gconf#exp' | +-------+--------------------------------------------------------+ | 93 | cri'http://coreapps.org/core.osc.gconf#gid_reuse' | +-------+--------------------------------------------------------+ | 94 | cri'http://coreapps.org/core.osc.gconf#app_group' | +-------+--------------------------------------------------------+ | 95 | cri'http://coreapps.org/core.osc.gconf#app_group_del' | +-------+--------------------------------------------------------+ | 96 | cri'http://coreapps.org/core.osc.gconf#app_group_add' | +-------+--------------------------------------------------------+ | 97 | cri'http://coreapps.org/core.osc.gconf#joining_uri' | +-------+--------------------------------------------------------+ | 98 | cri'http://coreapps.org/core.osc.gconf#app_groups' | +-------+--------------------------------------------------------+ | 99 | cri'http://coreapps.org/core.osc.gconf#group_policies' | +-------+--------------------------------------------------------+ | 100 | cri'http://coreapps.org/core.osc.gconf#group_policies | | | .key_update_check_interval' | +-------+--------------------------------------------------------+ | 101 | cri'http://coreapps.org/core.osc.gconf#group_policies | | | .exp_delta' | +-------+--------------------------------------------------------+ | 102 | cri'http://coreapps.org/core.osc.gconf#as_uri' | +-------+--------------------------------------------------------+ Figure 1: Shared item table for compressing CoRAL predicates. A.2. Compression of Values of the rt= Target Attribute The following shared item table is used for compressing values of the rt= target attribute, as per Section 2.2 of [I-D.ietf-cbor-packed]. +-------+--------------------------------------------------------+ | Index | Item | +-------+--------------------------------------------------------+ | 415 | cri'http://www.iana.org/assignments/linkformat/rt | | | /core.osc.gconf' | +-------+--------------------------------------------------------+ Figure 2: Shared item table for compressing values of the rt= target attribute. Appendix B. Document Updates RFC EDITOR: PLEASE REMOVE THIS SECTION. B.1. Version -00 to -01 Tiloca & Höglund Expires 17 July 2024 [Page 28] Internet-Draft CoRAL Admin Interface for the OSCORE GM January 2024 * Updated reference and introductory text for the CBOR EDN application-extension identifier "cri". B.2. Version -00 * CoRAL content taken out from draft-ietf-ace-oscore-gm-admin-08. Acknowledgments Most of the content in this document was originally specified in draft-ietf-ace-oscore-gm-admin, which is co-authored also by Peter van der Stok and Francesca Palombini, and where Klaus Hartke contributed in the initial definition of the resource model and interactions using CoRAL. The authors sincerely thank Christian Amsüss, Carsten Bormann, and Jim Schaad for their comments and feedback. The work on this document has been partly supported by VINNOVA and the Celtic-Next project CRITISEC; and by the H2020 project SIFIS-Home (Grant agreement 952652). Authors' Addresses Marco Tiloca RISE AB Isafjordsgatan 22 SE-16440 Stockholm Kista Sweden Email: marco.tiloca@ri.se Rikard Höglund RISE AB Isafjordsgatan 22 SE-16440 Stockholm Kista Sweden Email: rikard.hoglund@ri.se Tiloca & Höglund Expires 17 July 2024 [Page 29]