Key Management for OSCORE Groups in ACE
draft-ietf-ace-key-groupcomm-oscore-04
ACE Working Group M. Tiloca
Internet-Draft RISE AB
Intended status: Standards Track J. Park
Expires: July 18, 2020 Universitaet Duisburg-Essen
F. Palombini
Ericsson AB
January 15, 2020
Key Management for OSCORE Groups in ACE
draft-ietf-ace-key-groupcomm-oscore-04
Abstract
This specification defines an application profile of the ACE
framework for Authentication and Authorization, to request and
provision keying material in group communication scenarios that are
based on CoAP and secured with Group Object Security for Constrained
RESTful Environments (OSCORE). This application profile delegates
the authentication and authorization of Clients that join an OSCORE
group through a Resource Server acting as Group Manager for that
group. This application profile leverages protocol-specific
transport profiles of ACE to achieve communication security, server
authentication and proof-of-possession for a key owned by the Client
and bound to an OAuth 2.0 access token.
Status of This Memo
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document authors. All rights reserved.
Tiloca, et al. Expires July 18, 2020 [Page 1]
Internet-Draft Key Management for OSCORE Groups in ACE January 2020
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 3
2. Protocol Overview . . . . . . . . . . . . . . . . . . . . . . 5
2.1. Overview of the Joining Process . . . . . . . . . . . . . 5
2.2. Overview of the Group Rekeying Process . . . . . . . . . 6
3. Joining Node to Authorization Server . . . . . . . . . . . . 6
3.1. Authorization Request . . . . . . . . . . . . . . . . . . 6
3.2. Authorization Response . . . . . . . . . . . . . . . . . 7
4. Joining a Group . . . . . . . . . . . . . . . . . . . . . . . 7
4.1. Token Post . . . . . . . . . . . . . . . . . . . . . . . 7
4.2. Sending the Joining Request . . . . . . . . . . . . . . . 8
4.2.1. Value of the N_S Challenge . . . . . . . . . . . . . 9
4.3. Processing the Joining Request . . . . . . . . . . . . . 10
4.4. Joining Response . . . . . . . . . . . . . . . . . . . . 11
5. Public Keys of Joining Nodes . . . . . . . . . . . . . . . . 14
6. Retrieval of Updated Keying Material . . . . . . . . . . . . 15
6.1. Retrieval of Group Keying Material . . . . . . . . . . . 16
6.2. Retrieval of Group Keying Material and Sender ID . . . . 16
7. Retrieval of New Keying Material . . . . . . . . . . . . . . 16
8. Retrieval of Public Keys of Group Members . . . . . . . . . . 17
9. Retrieval of Group Policies . . . . . . . . . . . . . . . . . 18
10. Retrieval of Keying Material Version . . . . . . . . . . . . 18
11. Request to Leave the Group . . . . . . . . . . . . . . . . . 18
12. Removal of a Group Member . . . . . . . . . . . . . . . . . . 18
13. Group Rekeying Process . . . . . . . . . . . . . . . . . . . 19
14. Security Considerations . . . . . . . . . . . . . . . . . . . 20
15. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 21
15.1. ACE Groupcomm Key Registry . . . . . . . . . . . . . . . 21
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