Key Management for OSCORE Groups in ACE
draft-ietf-ace-key-groupcomm-oscore-08
ACE Working Group M. Tiloca
Internet-Draft RISE AB
Intended status: Standards Track J. Park
Expires: January 14, 2021 Universitaet Duisburg-Essen
F. Palombini
Ericsson AB
July 13, 2020
Key Management for OSCORE Groups in ACE
draft-ietf-ace-key-groupcomm-oscore-08
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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Copyright Notice
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document authors. All rights reserved.
Tiloca, et al. Expires January 14, 2021 [Page 1]
Internet-Draft Key Management for OSCORE Groups in ACE July 2020
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 4
2. Protocol Overview . . . . . . . . . . . . . . . . . . . . . . 5
2.1. Overview of the Joining Process . . . . . . . . . . . . . 6
2.2. Overview of the Group Rekeying Process . . . . . . . . . 6
3. Format of Scope . . . . . . . . . . . . . . . . . . . . . . . 7
4. Joining Node to Authorization Server . . . . . . . . . . . . 8
4.1. Authorization Request . . . . . . . . . . . . . . . . . . 9
4.2. Authorization Response . . . . . . . . . . . . . . . . . 9
5. Interface at the Group Manager . . . . . . . . . . . . . . . 9
5.1. GET Handler . . . . . . . . . . . . . . . . . . . . . . . 9
6. Token POST and Group Joining . . . . . . . . . . . . . . . . 10
6.1. Token Post . . . . . . . . . . . . . . . . . . . . . . . 10
6.2. Sending the Joining Request . . . . . . . . . . . . . . . 12
6.2.1. Value of the N_S Challenge . . . . . . . . . . . . . 13
6.3. Processing the Joining Request . . . . . . . . . . . . . 13
6.4. Joining Response . . . . . . . . . . . . . . . . . . . . 15
6.5. ACE Groupcomm Policy for Group OSCORE Pairwise Mode
Support . . . . . . . . . . . . . . . . . . . . . . . . . 18
7. Public Keys of Joining Nodes . . . . . . . . . . . . . . . . 18
8. Retrieval of Updated Keying Material . . . . . . . . . . . . 20
8.1. Retrieval of Group Keying Material . . . . . . . . . . . 20
8.2. Retrieval of Group Keying Material and Sender ID . . . . 21
9. Retrieval of New Keying Material . . . . . . . . . . . . . . 21
10. Retrieval of Public Keys of Group Members . . . . . . . . . . 22
11. Update of Public Key . . . . . . . . . . . . . . . . . . . . 23
12. Retrieval of Group Policies . . . . . . . . . . . . . . . . . 23
13. Retrieval of Keying Material Version . . . . . . . . . . . . 24
14. Retrieval of Group Status . . . . . . . . . . . . . . . . . . 24
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