draft-ietf-ace-key-groupcomm-06.txt   draft-ietf-ace-key-groupcomm-07.txt 
ACE Working Group F. Palombini ACE Working Group F. Palombini
Internet-Draft Ericsson AB Internet-Draft Ericsson AB
Intended status: Standards Track M. Tiloca Intended status: Standards Track M. Tiloca
Expires: 12 November 2020 RISE AB Expires: December 20, 2020 RISE AB
11 May 2020 June 18, 2020
Key Provisioning for Group Communication using ACE Key Provisioning for Group Communication using ACE
draft-ietf-ace-key-groupcomm-06 draft-ietf-ace-key-groupcomm-07
Abstract Abstract
This document defines message formats and procedures for requesting This document defines message formats and procedures for requesting
and distributing group keying material using the ACE framework, to and distributing group keying material using the ACE framework, to
protect communications between group members. protect communications between group members.
Status of This Memo Status of This Memo
This Internet-Draft is submitted in full conformance with the This Internet-Draft is submitted in full conformance with the
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This Internet-Draft will expire on 12 November 2020. This Internet-Draft will expire on December 20, 2020.
Copyright Notice Copyright Notice
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Table of Contents Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 3 1.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 3
2. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3. Authorization to Join a Group . . . . . . . . . . . . . . . . 7 3. Authorization to Join a Group . . . . . . . . . . . . . . . . 6
3.1. Authorization Request . . . . . . . . . . . . . . . . . . 7 3.1. Authorization Request . . . . . . . . . . . . . . . . . . 7
3.2. Authorization Response . . . . . . . . . . . . . . . . . 9 3.2. Authorization Response . . . . . . . . . . . . . . . . . 9
3.3. Token Post . . . . . . . . . . . . . . . . . . . . . . . 10 3.3. Token Post . . . . . . . . . . . . . . . . . . . . . . . 10
4. Keying Material Provisioning and Group Membership 4. Keying Material Provisioning and Group Membership Management 14
Management . . . . . . . . . . . . . . . . . . . . . . . 14
4.1. Interface at the KDC . . . . . . . . . . . . . . . . . . 15 4.1. Interface at the KDC . . . . . . . . . . . . . . . . . . 15
4.2. Joining Exchange . . . . . . . . . . . . . . . . . . . . 30 4.2. Joining Exchange . . . . . . . . . . . . . . . . . . . . 30
4.3. Retrieval of Updated Keying Material . . . . . . . . . . 32 4.3. Retrieval of Updated Keying Material . . . . . . . . . . 31
4.4. Retrieval of New Keying Material . . . . . . . . . . . . 34 4.4. Retrieval of New Keying Material . . . . . . . . . . . . 33
4.5. Retrieval of Public Keys and Roles for Group Members . . 34 4.5. Retrieval of Public Keys and Roles for Group Members . . 34
4.6. Update of Public Key . . . . . . . . . . . . . . . . . . 35 4.6. Update of Public Key . . . . . . . . . . . . . . . . . . 34
4.7. Retrieval of Group Policies . . . . . . . . . . . . . . . 36 4.7. Retrieval of Group Policies . . . . . . . . . . . . . . . 35
4.8. Retrieval of Keying Material Version . . . . . . . . . . 37 4.8. Retrieval of Keying Material Version . . . . . . . . . . 36
4.9. Group Leaving Request . . . . . . . . . . . . . . . . . . 37 4.9. Group Leaving Request . . . . . . . . . . . . . . . . . . 36
5. Removal of a Node from the Group . . . . . . . . . . . . . . 37 5. Removal of a Node from the Group . . . . . . . . . . . . . . 36
6. ACE Groupcomm Parameters . . . . . . . . . . . . . . . . . . 38 6. ACE Groupcomm Parameters . . . . . . . . . . . . . . . . . . 37
7. Security Considerations . . . . . . . . . . . . . . . . . . . 40 7. Security Considerations . . . . . . . . . . . . . . . . . . . 38
7.1. Update of Keying Material . . . . . . . . . . . . . . . . 40 7.1. Update of Keying Material . . . . . . . . . . . . . . . . 40
7.2. Block-Wise Considerations . . . . . . . . . . . . . . . . 41 7.2. Block-Wise Considerations . . . . . . . . . . . . . . . . 40
8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 42 8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 41
8.1. Media Type Registrations . . . . . . . . . . . . . . . . 42 8.1. Media Type Registrations . . . . . . . . . . . . . . . . 41
8.2. CoAP Content-Formats Registry . . . . . . . . . . . . . . 43 8.2. CoAP Content-Formats Registry . . . . . . . . . . . . . . 42
8.3. ACE Authorization Server Request Creation Hints 8.3. OAuth Parameters Registry . . . . . . . . . . . . . . . . 42
Registry . . . . . . . . . . . . . . . . . . . . . . . . 43 8.4. OAuth Parameters CBOR Mappings Registry . . . . . . . . . 42
8.4. ACE Groupcomm Parameters Registry . . . . . . . . . . . . 44 8.5. ACE Groupcomm Parameters Registry . . . . . . . . . . . . 43
8.5. ACE Groupcomm Key Registry . . . . . . . . . . . . . . . 44 8.6. ACE Groupcomm Key Registry . . . . . . . . . . . . . . . 43
8.6. ACE Groupcomm Profile Registry . . . . . . . . . . . . . 45 8.7. ACE Groupcomm Profile Registry . . . . . . . . . . . . . 44
8.7. ACE Groupcomm Policy Registry . . . . . . . . . . . . . . 46 8.8. ACE Groupcomm Policy Registry . . . . . . . . . . . . . . 45
8.8. Sequence Number Synchronization Method Registry . . . . . 46 8.9. Sequence Number Synchronization Method Registry . . . . . 46
8.9. Interface Description (if=) Link Target Attribute Values 8.10. Interface Description (if=) Link Target Attribute Values
Registry . . . . . . . . . . . . . . . . . . . . . . . . 47 Registry . . . . . . . . . . . . . . . . . . . . . . . . 46
8.10. Expert Review Instructions . . . . . . . . . . . . . . . 47 8.11. Expert Review Instructions . . . . . . . . . . . . . . . 46
9. References . . . . . . . . . . . . . . . . . . . . . . . . . 48 9. References . . . . . . . . . . . . . . . . . . . . . . . . . 47
9.1. Normative References . . . . . . . . . . . . . . . . . . 48 9.1. Normative References . . . . . . . . . . . . . . . . . . 47
9.2. Informative References . . . . . . . . . . . . . . . . . 49 9.2. Informative References . . . . . . . . . . . . . . . . . 49
9.3. URIs . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Appendix A. Requirements on Application Profiles . . . . . . . . 51 Appendix A. Requirements on Application Profiles . . . . . . . . 51
Appendix B. Document Updates . . . . . . . . . . . . . . . . . . 53 Appendix B. Document Updates . . . . . . . . . . . . . . . . . . 53
B.1. Version -04 to -05 . . . . . . . . . . . . . . . . . . . 53 B.1. Version -04 to -05 . . . . . . . . . . . . . . . . . . . 53
B.2. Version -03 to -04 . . . . . . . . . . . . . . . . . . . 54 B.2. Version -03 to -04 . . . . . . . . . . . . . . . . . . . 54
B.3. Version -02 to -03 . . . . . . . . . . . . . . . . . . . 54 B.3. Version -02 to -03 . . . . . . . . . . . . . . . . . . . 54
B.4. Version -01 to -02 . . . . . . . . . . . . . . . . . . . 55 B.4. Version -01 to -02 . . . . . . . . . . . . . . . . . . . 54
B.5. Version -00 to -01 . . . . . . . . . . . . . . . . . . . 56 B.5. Version -00 to -01 . . . . . . . . . . . . . . . . . . . 55
Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . 56 Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . 56
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 56 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 56
1. Introduction 1. Introduction
This document expands the ACE framework [I-D.ietf-ace-oauth-authz] to This document expands the ACE framework [I-D.ietf-ace-oauth-authz] to
define the message exchanges used to request, distribute and renew define the message exchanges used to request, distribute and renew
the keying material in a group communication scenario, e.g. based on the keying material in a group communication scenario, e.g. based on
multicast [I-D.dijk-core-groupcomm-bis] or on publishing-subscribing multicast [I-D.ietf-core-groupcomm-bis] or on publishing-subscribing
[I-D.ietf-core-coap-pubsub]. The ACE framework is based on CBOR [I-D.ietf-core-coap-pubsub]. The ACE framework is based on CBOR
[RFC7049], so CBOR is the format used in this specification. [RFC7049], so CBOR is the format used in this specification.
However, using JSON [RFC8259] instead of CBOR is possible, using the However, using JSON [RFC8259] instead of CBOR is possible, using the
conversion method specified in Sections 4.1 and 4.2 of [RFC7049]. conversion method specified in Sections 4.1 and 4.2 of [RFC7049].
Profiles that use group communication can build on this document, by Profiles that use group communication can build on this document, by
defining a number of details such as the exact group communication defining a number of details such as the exact group communication
protocol and security protocols used. The specific list of details a protocol and security protocols used. The specific list of details a
profile needs to define is shown in Appendix A. profile needs to define is shown in Appendix A.
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1.1. Terminology 1.1. Terminology
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in BCP "OPTIONAL" in this document are to be interpreted as described in BCP
14 [RFC2119] [RFC8174] when, and only when, they appear in all 14 [RFC2119] [RFC8174] when, and only when, they appear in all
capitals, as shown here. capitals, as shown here.
Readers are expected to be familiar with the terms and concepts Readers are expected to be familiar with the terms and concepts
described in [I-D.ietf-ace-oauth-authz] and [RFC8152], such as described in [I-D.ietf-ace-oauth-authz][I-D.ietf-cose-rfc8152bis-stru
Authorization Server (AS) and Resource Server (RS). ct][I-D.ietf-cose-rfc8152bis-algs], such as Authorization Server (AS)
and Resource Server (RS).
This document additionally uses the following terminology: This document additionally uses the following terminology:
* Transport profile, to indicate a profile of ACE as per o Transport profile, to indicate a profile of ACE as per
Section 5.6.4.3 of [I-D.ietf-ace-oauth-authz]. A transport Section 5.6.4.3 of [I-D.ietf-ace-oauth-authz]. A transport
profile specifies the communication protocol and communication profile specifies the communication protocol and communication
security protocol between an ACE Client and Resource Server, as security protocol between an ACE Client and Resource Server, as
well as proof-of-possession methods, if it supports proof-of- well as proof-of-possession methods, if it supports proof-of-
possession access tokens, etc. Tranport profiles of ACE include, possession access tokens, etc. Tranport profiles of ACE include,
for instance, [I-D.ietf-ace-oscore-profile], for instance, [I-D.ietf-ace-oscore-profile],
[I-D.ietf-ace-dtls-authorize] and [I-D.ietf-ace-mqtt-tls-profile]. [I-D.ietf-ace-dtls-authorize] and [I-D.ietf-ace-mqtt-tls-profile].
* Application profile, that defines how applications enforce and use o Application profile, that defines how applications enforce and use
supporting security services they require. These services may supporting security services they require. These services may
include, for instance, provisioning, revocation and include, for instance, provisioning, revocation and
(re-)distribution of keying material. An application profile may (re-)distribution of keying material. An application profile may
define specific procedures and message formats. define specific procedures and message formats.
2. Overview 2. Overview
+------------+ +-----------+ +------------+ +-----------+
| AS | | KDC | | AS | | KDC |
| | .-------->| | | | .-------->| |
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| Client |<-' | Dispatcher | ||+-----------+ | Client |<-' | Dispatcher | ||+-----------+
| |<-------->| (RS) |<------->|| Group | | |<-------->| (RS) |<------->|| Group |
+------------+ +------------+ +| members | +------------+ +------------+ +| members |
+-----------+ +-----------+
Figure 1: Key Distribution Participants Figure 1: Key Distribution Participants
The following participants (see Figure 1) take part in the The following participants (see Figure 1) take part in the
authorization and key distribution. authorization and key distribution.
* Client (C): node that wants to join the group communication. It o Client (C): node that wants to join the group communication. It
can request write and/or read rights. can request write and/or read rights.
* Authorization Server (AS): same as AS in the ACE Framework; it o Authorization Server (AS): same as AS in the ACE Framework; it
enforces access policies, and knows if a node is allowed to join a enforces access policies, and knows if a node is allowed to join a
given group with write and/or read rights. given group with write and/or read rights.
* Key Distribution Center (KDC): maintains the keying material to o Key Distribution Center (KDC): maintains the keying material to
protect group communications, and provides it to Clients protect group communications, and provides it to Clients
authorized to join a given group. During the first part of the authorized to join a given group. During the first part of the
exchange (Section 3), it takes the role of the RS in the ACE exchange (Section 3), it takes the role of the RS in the ACE
Framework. During the second part (Section 4), which is not based Framework. During the second part (Section 4), which is not based
on the ACE Framework, it distributes the keying material. In on the ACE Framework, it distributes the keying material. In
addition, it provides the latest keying material to group members addition, it provides the latest keying material to group members
when requested or, if required by the application, when membership when requested or, if required by the application, when membership
changes. changes.
* Dispatcher: entity through which the Clients communicate with the o Dispatcher: entity through which the Clients communicate with the
group and which distributes messages to the group members. group and which distributes messages to the group members.
Examples of dispatchers are: the Broker node in a pub-sub setting; Examples of dispatchers are: the Broker node in a pub-sub setting;
a relayer node for group communication that delivers group a relayer node for group communication that delivers group
messages as multiple unicast messages to all group members; an messages as multiple unicast messages to all group members; an
implicit entity as in a multicast communication setting, where implicit entity as in a multicast communication setting, where
messages are transmitted to a multicast IP address and delivered messages are transmitted to a multicast IP address and delivered
on the transport channel. on the transport channel.
This document specifies a mechanism for: This document specifies a mechanism for:
* Authorizing a new node to join the group (Section 3), and o Authorizing a new node to join the group (Section 3), and
providing it with the group keying material to communicate with providing it with the group keying material to communicate with
the other group members (Section 4). the other group members (Section 4).
* A node to leave the group of for the KDC to remove a current o Leaving or removing a current group member from the group
member of the group (Section 5). (Section 5).
* Retrieving keying material as a current group member (Section 4.3 o Retrieval of keying material by a group member (Section 4.3 and
and Section 4.4). Section 4.4).
* Renewing and re-distributing the group keying material (rekeying) o Renewing and re-distributing the group keying material (rekeying)
upon a membership change in the group (Section 4.9 and Section 5). upon a membership change in the group (Section 4.9 and Section 5).
Figure 2 provides a high level overview of the message flow for a Figure 2 provides a high level overview of the message flow for a
node joining a group communication setting, which can be expanded as node joining a group communication setting, which can be expanded as
follows. follows.
1. The joining node requests an Access Token from the AS, in order 1. The joining node requests an Access Token from the AS, in order
to access a specific group-membership resource on the KDC and to access a specific group-membership resource on the KDC and
hence join the associated group. The joining node will start or hence join the associated group. The joining node will start or
continue using a secure communication association with the KDC, continue using a secure communication association with the KDC,
skipping to change at page 6, line 39 skipping to change at page 6, line 32
| | | | | |
|------- Joining Request ------->| | |------- Joining Request ------->| |
| | | | | |
|<------ Joining Response -------|-- Group Rekeying -->| |<------ Joining Response -------|-- Group Rekeying -->|
| | | | | |
| Dispatcher | | Dispatcher |
| | | | | |
|<===== Secure group communication =======|===========>| |<===== Secure group communication =======|===========>|
| | | | | |
Figure 2: Message Flow Upon New Node's Joining Figure 2: Message Flow Upon New Node's Joining
The exchange of Authorization Request and Authorization Response The exchange of Authorization Request and Authorization Response
between Client and AS MUST be secured, as specified by the transport between Client and AS MUST be secured, as specified by the transport
profile of ACE used between Client and KDC. profile of ACE used between Client and KDC.
The exchange of Joining Request and Joining Response between Client The Joining Request and Joining Response, and all further
and KDC MUST be secured, as a result of the transport profile of ACE communications between the Client and the KDC MUST be sent over the
used between Client and KDC. secure channel established as a result of the transport profile of
ACE used between Client and KDC.
All further communications between the Client and the KDC MUST be
secured, for instance with the same security mechanism used for the
Key Distribution exchange.
All communications between a Client and the other group members MUST All communications between a Client and the other group members MUST
be secured using the keying material provided in Section 4. be secured using the keying material provided in Section 4.
3. Authorization to Join a Group 3. Authorization to Join a Group
This section describes in detail the format of messages exchanged by This section describes in detail the format of messages exchanged by
the participants when a node requests access to a group. This the participants when a node requests access to a given group. This
exchange is based on ACE [I-D.ietf-ace-oauth-authz]. exchange is based on ACE [I-D.ietf-ace-oauth-authz].
As defined in [I-D.ietf-ace-oauth-authz], the Client requests from As defined in [I-D.ietf-ace-oauth-authz], the Client requests from
the AS an authorization to join the group through the KDC (see the AS an authorization to join the group through the KDC (see
Section 3.1). If the request is approved and authorization is Section 3.1). If the request is approved and authorization is
granted, the AS provides the Client with a proof-of-possession access granted, the AS provides the Client with a proof-of-possession access
token and parameters to securely communicate with the KDC (see token and parameters to securely communicate with the KDC (see
Section 3.2). Section 3.2).
Communications between the Client and the AS MUST be secured, as Communications between the Client and the AS MUST be secured, as
skipping to change at page 7, line 41 skipping to change at page 7, line 32
Client AS KDC Client AS KDC
| | | | | |
|---- Authorization Request: POST /token ------>| | |---- Authorization Request: POST /token ------>| |
| | | | | |
|<--- Authorization Response: 2.01 (Created) ---| | |<--- Authorization Response: 2.01 (Created) ---| |
| | | | | |
|----- POST Token: POST /authz-info --------------->| |----- POST Token: POST /authz-info --------------->|
| | | |
Figure 3: Message Flow of Join Authorization Figure 3: Message Flow of Join Authorization
3.1. Authorization Request 3.1. Authorization Request
The Authorization Request sent from the Client to the AS is as The Authorization Request sent from the Client to the AS is defined
defined in Section 5.6.1 of [I-D.ietf-ace-oauth-authz] and MAY in Section 5.6.1 of [I-D.ietf-ace-oauth-authz] and MAY contain the
contain the following parameters, which, if included, MUST have the following parameters, which, if included, MUST have the corresponding
corresponding values: values:
* 'scope', containing the identifier of the specific group(s), or o 'scope', containing the identifier of the specific group(s), or
topic(s) in the case of pub-sub, that the Client wishes to access, topic(s) in the case of pub-sub, that the Client wishes to access,
and optionally the role(s) that the Client wishes to take. and optionally the role(s) that the Client wishes to take.
This value is a CBOR byte string, encoding a CBOR array of one or This value is a CBOR byte string, encoding a CBOR array of one or
more entries. more entries.
An entry has as value a CBOR array, which contains: An entry has as value a CBOR array, which contains:
- As first element, the identifier of the specific group or * As first element, the identifier of the specific group or
topic. topic.
- Optionally, as second element, the role (or CBOR array of * Optionally, as second element, the role (or CBOR array of
roles) that the Client wishes to take in the group. This roles) that the Client wishes to take in the group. This
element is optional since roles may have been pre-assigned to element is optional since roles may have been pre-assigned to
the Client, as associated to its verifiable identity the Client, as associated to its verifiable identity
credentials. Alternatively, the application may have defined a credentials. Alternatively, the application may have defined a
single, well-known role for the target resource(s) and single, well-known role for the target resource(s) and
audience(s). audience(s). Note that, if applicable in the application use
cases, the application profile can define a format for the role
as the one defined in [I-D.bormann-core-ace-aif].
In each entry, the encoding of the group or topic identifier In each entry, the encoding of the group or topic identifier (REQ1
(REQ1) and of the role identifiers (REQ2) is application specific, in Appendix A) and of the role identifiers (REQ2) is application
and part of the requirements for the application profile. specific, and part of the requirements for the application
profile.
In particular, the application profile may specify CBOR values to In particular, the application profile may specify CBOR values to
use for abbreviating role identifiers (OPT7). use for abbreviating role identifiers (OPT7).
The CDDL definition of scope, using as example group identifier The CDDL definition [RFC8610] of scope, using as example group
encoded as byte string and role identifier as text string, is identifier encoded as byte string and role identifier as text
given in Figure 4. string, is given in Figure 4.
* 'audience', with an identifier of a KDC. o 'audience', with an identifier of a KDC.
* 'req_cnf', as defined in Section 3.1 of o 'req_cnf', as defined in Section 3.1 of
[I-D.ietf-ace-oauth-params], optionally containing the public key [I-D.ietf-ace-oauth-params], optionally containing the public key
or a reference to the public key of the Client, if it wishes to or a reference to the public key of the Client, if it wishes to
communicate that to the AS. communicate that to the AS.
* Other additional parameters as defined in o Other additional parameters as defined in
[I-D.ietf-ace-oauth-authz], if necessary. [I-D.ietf-ace-oauth-authz], if necessary.
As in [I-D.ietf-ace-oauth-authz], these parameters are included in As in [I-D.ietf-ace-oauth-authz], these parameters are included in
the payload, which is formatted as a CBOR map. The Content-Format the payload, which is formatted as a CBOR map. The Content-Format
"application/ace+cbor" defined in Section 8.14 of "application/ace+cbor" defined in Section 8.14 of
[I-D.ietf-ace-oauth-authz] is used. [I-D.ietf-ace-oauth-authz] is used.
gid = bstr gid = bstr
role = tstr role = tstr
scope_entry = [ gid , ? ( role / [ 2*role ] ) ] scope_entry = [ gid , ? ( role / [ 2*role ] ) ]
scope = << [ + scope_entry ] >> scope = << [ + scope_entry ] >>
Figure 4: CDLL definition of scope, using as example group Figure 4: CDLL definition of scope, using as example group identifier
identifier encoded as bstr and role as tstr encoded as bstr and role as tstr
3.2. Authorization Response 3.2. Authorization Response
The Authorization Response sent from the AS to the Client is as The Authorization Response sent from the AS to the Client is defined
defined in Section 5.6.2 of [I-D.ietf-ace-oauth-authz] and MUST in Section 5.6.2 of [I-D.ietf-ace-oauth-authz] and MUST contain the
contain the following parameters: following parameters:
* 'access_token', containing the proof-of-possession access token. o 'access_token', containing the proof-of-possession access token.
* 'cnf' if symmetric keys are used, not present if asymmetric keys o 'cnf' if symmetric keys are used, not present if asymmetric keys
are used. This parameter is defined in Section 3.2 of are used. This parameter is defined in Section 3.2 of
[I-D.ietf-ace-oauth-params] and contains the symmetric proof-of- [I-D.ietf-ace-oauth-params] and contains the symmetric proof-of-
possession key that the Client is supposed to use with the KDC. possession key that the Client is supposed to use with the KDC.
* 'rs_cnf' if asymmetric keys are used, not present if symmetric o 'rs_cnf' if asymmetric keys are used, not present if symmetric
keys are used. This parameter is as defined in Section 3.2 of keys are used. This parameter is defined in Section 3.2 of
[I-D.ietf-ace-oauth-params] and contains information about the [I-D.ietf-ace-oauth-params] and contains information about the
public key of the KDC. public key of the KDC.
* 'expires_in', contains the lifetime in seconds of the access o 'expires_in', contains the lifetime in seconds of the access
token. This parameter MAY be omitted if the application defines token. This parameter MAY be omitted if the application defines
how the expiration time is communicated to the Client via other how the expiration time is communicated to the Client via other
means, or if it establishes a default value. means, or if it establishes a default value.
Additionally, the Authorization Response MAY contain the following Additionally, the Authorization Response MAY contain the following
parameters, which, if included, MUST have the corresponding values: parameters, which, if included, MUST have the corresponding values:
* 'scope' containing the granted scope, if different from the scope o 'scope' containing the granted scope, if different from the scope
requested by the client. This parameter has the same format and requested by the client. This parameter has the same format and
encoding of 'scope' in the Authorization Request, defined in encoding of 'scope' in the Authorization Request, defined in
Section 3.1. Section 3.1.
* Other additional parameters as defined in o Other additional parameters as defined in
[I-D.ietf-ace-oauth-authz], if necessary. [I-D.ietf-ace-oauth-authz], if necessary.
The proof-of-possession access token (in 'access_token' above) MUST The proof-of-possession access token (in 'access_token' above) MUST
contain the following parameters: contain the following parameters:
* a confirmation claim (see for example 'cnf' defined in Section 3.1 o a confirmation claim (see for example 'cnf' defined in Section 3.1
of [RFC8747] for CWT); of [RFC8747] for CWT);
* an expiration time claim (see for example 'exp' defined in o an expiration time claim (see for example 'exp' defined in
Section 3.1.4 of [RFC8392] for CWT); Section 3.1.4 of [RFC8392] for CWT);
* a scope claim (see for example 'scope' registered in Section 8.13 o a scope claim (see for example 'scope' registered in Section 8.13
of [I-D.ietf-ace-oauth-authz] for CWT). This claim has the same of [I-D.ietf-ace-oauth-authz] for CWT). This claim has the same
encoding as 'scope' parameter above. Additionally, this claim has encoding as 'scope' parameter above. Additionally, this claim has
the same value of the 'scope' parameter if the parameter is the same value of the 'scope' parameter if the parameter is
present in the message, or it takes the value of 'scope' in the present in the message, or it takes the value of 'scope' in the
Authorization Request otherwise. Authorization Request otherwise.
The access token MAY additionally contain other claims that the The access token MAY additionally contain other claims that the
transport profile of ACE requires, or other optional parameters. transport profile of ACE requires, or other optional parameters.
As in [I-D.ietf-ace-oauth-authz], these parameters are included in As in [I-D.ietf-ace-oauth-authz], these parameters are included in
skipping to change at page 10, line 51 skipping to change at page 10, line 40
Optionally, the Client might want to request necessary information Optionally, the Client might want to request necessary information
concerning the public keys in the group, as well as concerning the concerning the public keys in the group, as well as concerning the
algorithm and related parameters for computing signatures in the algorithm and related parameters for computing signatures in the
group. In such a case, the joining node MAY ask for that information group. In such a case, the joining node MAY ask for that information
to the KDC in this same request. To this end, it sends the CoAP POST to the KDC in this same request. To this end, it sends the CoAP POST
request to the /authz-info endpoint using the Content-Format request to the /authz-info endpoint using the Content-Format
"application/ace+cbor". The payload of the message MUST be formatted "application/ace+cbor". The payload of the message MUST be formatted
as a CBOR map, including the access token and the following as a CBOR map, including the access token and the following
parameters: parameters:
* 'sign_info' defined in Section 3.3.1. o 'sign_info' defined in Section 3.3.1.
* 'pub_key_enc' defined in Section 3.3.2, encoding the CBOR simple o 'pub_key_enc' defined in Section 3.3.2, encoding the CBOR simple
value Null, to require information on the exact encoding of public value Null, to require information on the exact encoding of public
keys used in the group. keys used in the group.
Alternatively, the joining node may retrieve this information by Alternatively, the joining node may retrieve this information by
other means. other means.
After successful verification, the Client is authorized to receive After successful verification, the Client is authorized to receive
the group keying material from the KDC and join the group. In the group keying material from the KDC and join the group. In
particular, the KDC replies to the Client with a 2.01 (Created) particular, the KDC replies to the Client with a 2.01 (Created)
response, using Content-Format "application/ace+cbor" defined in response, using Content-Format "application/ace+cbor" defined in
skipping to change at page 12, line 15 skipping to change at page 12, line 7
Note that the CBOR map specified as payload of the 2.01 (Created) Note that the CBOR map specified as payload of the 2.01 (Created)
response may include further parameters, e.g. according to the response may include further parameters, e.g. according to the
signalled transport profile of ACE. signalled transport profile of ACE.
Applications of this specification MAY define alternative specific Applications of this specification MAY define alternative specific
negotiations of parameter values for signature algorithm and negotiations of parameter values for signature algorithm and
signature keys, if 'sign_info' and 'pub_key_enc' are not used (OPT2). signature keys, if 'sign_info' and 'pub_key_enc' are not used (OPT2).
3.3.1. 'sign_info' Parameter 3.3.1. 'sign_info' Parameter
The 'sign_info' parameter is an OPTIONAL parameter of the AS Request The 'sign_info' parameter is an OPTIONAL parameter of the Token Post
Creation Hints message defined in Section 5.1.2. of response message defined in Section 5.1.2. of
[I-D.ietf-ace-oauth-authz]. This parameter contains information and [I-D.ietf-ace-oauth-authz]. This parameter contains information and
parameters about the signature algorithm and the public keys to be parameters about the signature algorithm and the public keys to be
used between the Client and the RS. Its exact content is application used between the Client and the RS. Its exact content is application
specific. specific.
In this specification and in application profiles building on it, In this specification and in application profiles building on it,
this parameter is used to ask and retrieve from the KDC information this parameter is used to ask and retrieve from the KDC information
about the signature algorithm and related parameters used in the about the signature algorithm and related parameters used in the
group. group.
When used in the request, the 'sign_info' encodes the CBOR simple When used in the request, the 'sign_info' encodes the CBOR simple
value Null, to require information and parameters on the signature value Null, to require information and parameters on the signature
algorithm and on the public keys used. algorithm and on the public keys used.
The CDDL notation of the 'sign_info' parameter formatted as in the The CDDL notation [RFC8610] of the 'sign_info' parameter formatted as
request is given below. in the request is given below.
sign_info_req = nil sign_info_req = nil
The 'sign_info' parameter of the 2.01 (Created) response is a CBOR The 'sign_info' parameter of the 2.01 (Created) response is a CBOR
array of one ore more elements. The number of elements is lower or array of one ore more elements. The number of elements is lower or
at most equal to the number of groups the client has been authorized at most equal to the number of groups the client has been authorized
to join. Each element contains information about signing parameters to join. Each element contains information about signing parameters
and keys for one or more group or topic and is formatted as follows. and keys for one or more group or topic and is formatted as follows.
* The first element 'id' is an identifier of the group or an array o The first element 'id' is an identifier of the group or an array
of identifiers for the groups for which this information applies. of identifiers for the groups for which this information applies.
* The second element 'sign_alg' is an integer or a text string if o The second element 'sign_alg' is an integer or a text string if
the POST request included the 'sing_info' parameter with value the POST request included the 'sign_info' parameter with value
Null, and indicates the signature algorithm used in the group Null, and indicates the signature algorithm used in the group
identified by 'gid'. It is REQUIRED of the application profiles identified by 'gid'. It is REQUIRED of the application profiles
to define specific values that this parameter can take (REQ3), to define specific values that this parameter can take (REQ3),
selected from the set of signing algorithms of the COSE Algorithms selected from the set of signing algorithms of the COSE Algorithms
registry defined in [RFC8152]. If the POST request did not registry [COSE.Algorithms]. If the POST request did not include
include the 'sing_info' parameter, this element is encoded as the
CBOR simple value Null.
* The third element 'sign_parameters' indicates the parameters of
the signature algorithm. Its structure depends on the value of
'sign_alg'. It is REQUIRED of the application profiles to define
specific values for this parameter (REQ4). If no parameters of
the signature algorithm are specified, 'sign_parameters' MUST be
encoded as the CBOR simple value Null. If the POST request did
not include the 'sing_info' parameter, this element is encoded as
the CBOR simple value Null.
* The fourth element 'sign_key_parameters' indicates the parameters
of the key used with the signature algorithm. Its structure
depends on the value of 'sign_alg'. It is REQUIRED of the
application profiles to define specific values for this parameter
(REQ5). If no parameters of the key used with the signature
algorithm are specified, 'sign_key_parameters' MUST be encoded as
the CBOR simple value Null. If the POST request did not include
the 'sing_info' parameter, this element is encoded as the CBOR the 'sing_info' parameter, this element is encoded as the CBOR
simple value Null. simple value Null.
* The fifth element 'pub_key_enc' parameter is optional and MUST o The third element 'sign_parameters' is a CBOR array indicating the
parameters of the signature algorithm. Its content depends on the
value of 'sign_alg'. It is REQUIRED of the application profiles
to define the possible values and structure for the elements of
this parameter (REQ4). If the POST request did not include the
'sign_info' parameter, this element is encoded as the CBOR simple
value Null.
o The fourth element 'sign_key_parameters' is a CBOR array
indicating the parameters of the key used with the signature
algorithm. Its content depends on the value of 'sign_alg'. It is
REQUIRED of the application profiles to define the possible values
and structure for the elements of this parameter (REQ5). If the
POST request did not include the 'sing_info' parameter, this
element is encoded as the CBOR simple value Null.
o The fifth element 'pub_key_enc' parameter is optional and MUST
only be present if the POST request included the 'pub_key_enc' only be present if the POST request included the 'pub_key_enc'
parameter with value Null. If present, it is either a CBOR parameter with value Null. If present, it is either a CBOR
integer indicating the encoding of public keys used in the group integer indicating the encoding of public keys used in the group
identified by 'gid', or has value Null indicating that the KDC identified by 'gid', or has value Null indicating that the KDC
does not act as repository of public keys for group members. Its does not act as repository of public keys for group members. Its
acceptable values are taken from the "CWT Confirmation Method" acceptable values are taken from the "CWT Confirmation Method"
Registry defined in [I-D.ietf-ace-cwt-proof-of-possession]. It is Registry defined in [RFC8747]. It is REQUIRED of the application
REQUIRED of the application profiles to define specific values to profiles to define specific values to use for this parameter
use for this parameter (REQ6). (REQ6).
The CDDL notation of the 'sign_info' parameter formatted as in the The CDDL notation [RFC8610] of the 'sign_info' parameter formatted as
response is given below, with gid formatted as a bstr (note that gid in the response is given below, with gid formatted as a bstr (note
can be encoded differently, see REQ1). that gid can be encoded differently, see REQ1).
sign_info_res = [ + sign_info_entry ] sign_info_res = [ + sign_info_entry ]
sign_info_entry = sign_info_entry =
[ [
id : gid / [ + gid ], id : gid / [ + gid ],
sign_alg : int / tstr / nil, sign_alg : int / tstr / nil,
sign_parameters : any / nil, sign_parameters : [ any ] / nil,
sign_key_parameters : any / nil, sign_key_parameters : [ any ] / nil,
? pub_key_enc_res = int / nil ? pub_key_enc_res = int / nil
] ]
gid = bstr gid = bstr
3.3.2. 'pub_key_enc' Parameter 3.3.2. 'pub_key_enc' Parameter
The 'pub_key_enc' parameter is an OPTIONAL parameter of the AS The 'pub_key_enc' parameter is an OPTIONAL parameter of the Token
Request Creation Hints message defined in Section 5.1.2. of Post response message defined in Section 5.1.2. of
[I-D.ietf-ace-oauth-authz]. This parameter contains information [I-D.ietf-ace-oauth-authz]. This parameter contains information
about the exact encoding of public keys to be used between the Client about the exact encoding of public keys to be used between the Client
and the RS. Its exact content is application specific. and the RS. Its exact content is application specific.
In this specification and in application profiles building on it, In this specification and in application profiles building on it,
this parameter is used to ask the KDC information about the encoding this parameter is used to ask the KDC information about the encoding
of public keys used in the group. of public keys used in the group.
The CDDL notation of the 'pub_key_enc' parameter formatted as in the The CDDL notation [RFC8610] of the 'pub_key_enc' parameter formatted
request is given below. as in the request is given below.
pub_key_enc_req = nil pub_key_enc_req = nil
3.3.3. 'kdcchallenge' Parameter 3.3.3. 'kdcchallenge' Parameter
The 'kdcchallenge' parameter is an OPTIONAL parameter of the AS The 'kdcchallenge' parameter is an OPTIONAL parameter of the Token
Request Creation Hints message defined in Section 5.1.2. of Post response message defined in Section 5.1.2. of
[I-D.ietf-ace-oauth-authz]. This parameter contains a challenge [I-D.ietf-ace-oauth-authz]. This parameter contains a challenge
generated by the KDC and provided to the Client. The Client may use generated by the KDC and provided to the Client. The Client may use
this challenge to prove possession of its own private key in the this challenge to prove possession of its own private key in the
Joining Request ((see the 'client_cred_verify' parameter in Joining Request ((see the 'client_cred_verify' parameter in
Section 4). Section 4).
4. Keying Material Provisioning and Group Membership Management 4. Keying Material Provisioning and Group Membership Management
This section defines the interface available at the KDC. Moreover, This section defines the interface available at the KDC. Moreover,
this section specifies how the clients can use this interface to join this section specifies how the clients can use this interface to join
skipping to change at page 15, line 17 skipping to change at page 14, line 42
Section 4.2). Then, the KDC verifies the access token and that the Section 4.2). Then, the KDC verifies the access token and that the
Client is authorized to join that group. If so, it provides the Client is authorized to join that group. If so, it provides the
Client with the keying material to securely communicate with the Client with the keying material to securely communicate with the
other members of the group. Whenever used, the Content-Format in other members of the group. Whenever used, the Content-Format in
messages containing a payload is set to application/ace- messages containing a payload is set to application/ace-
groupcomm+cbor, as defined in Section 8.2. groupcomm+cbor, as defined in Section 8.2.
When the Client is already a group member, the Client can use the When the Client is already a group member, the Client can use the
interface at the KDC to perform the following actions: interface at the KDC to perform the following actions:
* The Client can (re-)get the current keying material, for cases o The Client can (re-)get the current keying material, for cases
such as expiration, loss or suspected mismatch, due to e.g. reboot such as expiration, loss or suspected mismatch, due to e.g. reboot
or missed group rekeying. This is described in Section 4.3. or missed group rekeying. This is described in Section 4.3.
* The Client can retrieve a new individual key, or new input o The Client can retrieve a new individual key, or new input
material to derive it. This is described in Section 4.4. material to derive it. This is described in Section 4.4.
* The Client can (re-)get the public keys of other group members, o The Client can (re-)get the public keys of other group members,
e.g. if it is aware of new nodes joining the group after itself. e.g. if it is aware of new nodes joining the group after itself.
This is described in Section 4.5. This is described in Section 4.5.
* The Client can (re-)get the policies currently enforced in the o The Client can (re-)get the policies currently enforced in the
group. This is described in Section 4.7. group. This is described in Section 4.7.
* The Client can (re-)get the version number of the keying material o The Client can (re-)get the version number of the keying material
currently used in the group. This is described in Section 4.8. currently used in the group. This is described in Section 4.8.
* The Client can request to leave the group. This is further o The Client can request to leave the group. This is further
discussed in Section 4.9. discussed in Section 4.9.
Upon receiving a request from a Client, the KDC MUST check that it is Upon receiving a request from a Client, the KDC MUST check that it is
storing a valid access token from that Client for the group storing a valid access token from that Client for the group
identifier assiciated to the endpoint. If that is not the case, i.e. identifier associated to the endpoint. If that is not the case, i.e.
the KDC does not store a valid access token or this is not valid for the KDC does not store a valid access token or this is not valid for
that Client for the group identifier at hand, the KDC MUST respond to that Client for the group identifier at hand, the KDC MUST respond to
the Client with a 4.01 (Unauthorized) error message. the Client with a 4.01 (Unauthorized) error message.
4.1. Interface at the KDC 4.1. Interface at the KDC
The KDC is configured with the following resources. Note that the The KDC is configured with the following resources. Note that the
root url-path "ace-group" given here are default names: root url-path "ace-group" given here are default names:
implementations are not required to use these names, and can define implementations are not required to use these names, and can define
their own instead. The Interface Description (if=) Link Target their own instead. The Interface Description (if=) Link Target
Attribute value ace-group is registered (Section 8.9) and can be used Attribute value ace-group is registered (Section 8.10) and can be
to describe this inferface. used to describe this interface.
* /ace-group : this resource is fixed and indicates that this o /ace-group : this resource is fixed and indicates that this
specification is used. Other applications that run on a KDC specification is used. If other applications run on a KDC
implementing this specification MUST NOT use this same resource. implementing this specification and use this same resource, these
applications will collide, and a mechanism will be needed to
differentiate the endpoints.
* /ace-group/GROUPNAME : one sub-resource to /ace-group is o /ace-group/GROUPNAME : one sub-resource to /ace-group is
implemented for each group the KDC manages. These resources are implemented for each group the KDC manages. These resources are
identified by the group identifiers of the groups the KDC manages identified by the group identifiers of the groups the KDC manages
(in this example, the group identifier has value "GROUPNAME"). (in this example, the group identifier has value "GROUPNAME").
These resources support GET and POST method. These resources support GET and POST method.
* /ace-group/GROUPNAME/pub-key : this sub-resource is fixed and o /ace-group/GROUPNAME/pub-key : this sub-resource is fixed and
supports GET and FETCH methods. supports GET and FETCH methods.
* /ace-group/GROUPNAME/policies: this sub-resource is fixed and o /ace-group/GROUPNAME/policies: this sub-resource is fixed and
supports the GET method. supports the GET method.
* /ace-group/GROUPNAME/ctx-num: this sub-resource is fixed and o /ace-group/GROUPNAME/ctx-num: this sub-resource is fixed and
supports the GET method. supports the GET method.
* /ace-group/GROUPNAME/nodes/NODENAME: one sub-resource to /ace- o /ace-group/GROUPNAME/nodes/NODENAME: one sub-resource to /ace-
group/GROUPNAME is implemented for each node in the group the KDC group/GROUPNAME is implemented for each node in the group the KDC
manages. These resources are identified by the node name (in this manages. These resources are identified by the node name (in this
example, the node name has value "NODENAME"). These resources example, the node name has value "NODENAME"). These resources
support GET, PUT and DELETE methods. support GET, PUT and DELETE methods.
* /ace-group/GROUPNAME/nodes/NODENAME/pub-key: one sub-resource to o /ace-group/GROUPNAME/nodes/NODENAME/pub-key: one sub-resource to
/ace-group/GROUPNAME/nodes/NODENAME is implemented for each node /ace-group/GROUPNAME/nodes/NODENAME is implemented for each node
in the group the KDC manages. These resources are identified by in the group the KDC manages. These resources are identified by
the node name (in this example, the node name has value the node name (in this example, the node name has value
"NODENAME"). These resources support the POST method. "NODENAME"). These resources support the POST method.
The details for the handlers of each resource are given in the The details for the handlers of each resource are given in the
following sections. These endpoints are used to perform the following sections. These endpoints are used to perform the
operations introduced in Section 4. operations introduced in Section 4.
4.1.1. ace-group 4.1.1. ace-group
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4.1.2.1. POST Handler 4.1.2.1. POST Handler
The POST handler adds the public key of the client to the list of the The POST handler adds the public key of the client to the list of the
group members' public keys and returns the symmetric group keying group members' public keys and returns the symmetric group keying
material for the group identified by "GROUPNAME". material for the group identified by "GROUPNAME".
The handler expects a request with payload formatted as a CBOR map The handler expects a request with payload formatted as a CBOR map
which MAY contain the following fields, which, if included, MUST have which MAY contain the following fields, which, if included, MUST have
the corresponding values: the corresponding values:
* 'scope', with value the specific resource that the Client is o 'scope', with value the specific resource at the KDC that the
authorized to access, i.e. group or topic identifier, and role(s). Client is authorized to access, i.e. group or topic identifier,
This value is a CBOR byte string encoding one scope entry, as and role(s). This value is a CBOR byte string encoding one scope
defined in Section 3.1. entry, as defined in Section 3.1.
* 'get_pub_keys', if the Client wishes to receive the public keys of o 'get_pub_keys', if the Client wishes to receive the public keys of
the other nodes in the group from the KDC. The value is an empty the other nodes in the group from the KDC. The value is an empty
CBOR array. This parameter may be present if the KDC stores the CBOR array. This parameter may be present if the KDC stores the
public keys of the nodes in the group and distributes them to the public keys of the nodes in the group and distributes them to the
Client; it is useless to have here if the set of public keys of Client; it is useless to have here if the set of public keys of
the members of the group is known in another way, e.g. it was the members of the group is known in another way, e.g. it was
provided by the AS. provided by the AS.
* 'client_cred', with value the public key or certificate of the o 'client_cred', with value the public key or certificate of the
Client, encoded as a CBOR byte string. This field contains the Client, encoded as a CBOR byte string. This field contains the
public key of the Client. This field is used if the KDC is public key of the Client. This field is used if the KDC is
managing (collecting from/distributing to the Client) the public managing (collecting from/distributing to the Client) the public
keys of the group members, and if the Client's role in the group keys of the group members, and if the Client's role in the group
will require for it to send messages to the group. The default will require for it to send messages to the group. The default
encoding for public keys is COSE Keys. Alternative specific encoding for public keys is COSE Keys. Alternative specific
encodings of this parameter MAY be defined in applications of this encodings of this parameter MAY be defined in applications of this
specification (OPT1). specification (OPT1 in Appendix A).
* 'cnonce', with the same encoding as defined for the "cnonce" o 'cnonce', with the same encoding as defined for the "cnonce"
parameter of Ace, in Section 5.1.2 of [I-D.ietf-ace-oauth-authz], parameter of Ace, in Section 5.1.2 of [I-D.ietf-ace-oauth-authz],
and including a dedicated nonce N_C generated by the Client. This and including a dedicated nonce N_C generated by the Client. This
parameter MUST be present if the 'client_cred' parameter is parameter MUST be present if the 'client_cred' parameter is
present. present.
* 'client_cred_verify', encoded as a CBOR byte string. This o 'client_cred_verify', encoded as a CBOR byte string. This
parameter MUST be present if the 'client_cred' parameter is parameter MUST be present if the 'client_cred' parameter is
present and no public key associated to the client's token can be present and no public key associated to the client's token can be
retrieved for that group. This parameter contains a signature retrieved for that group. This parameter contains a signature
computed by the Client over the scope concatenated with N_S computed by the Client over the scope concatenated with N_S
concatenated with N_C, where: concatenated with N_C, where:
- scope is the byte string specified in the 'scope parameter * scope is the byte string specified in the 'scope parameter
above'. above'.
- N_S is the challenge received from the KDC in the * N_S is the challenge received from the KDC in the
'kdcchallenge' parameter of the 2.01 (Created) response to the 'kdcchallenge' parameter of the 2.01 (Created) response to the
token POST request (see Section 3.3). token POST request (see Section 3.3).
- N_C is the nonce generated by the Client and specified in the * N_C is the nonce generated by the Client and specified in the
'cnonce' parameter above. 'cnonce' parameter above.
If the token is not being posted (e.g. if it is used directly to If the token is not being posted (e.g. if it is used directly to
validate TLS instead), it is REQUIRED of the specific profile to validate TLS instead), it is REQUIRED of the specific profile to
define how the challenge N_S is generated (REQ17). The Client define how the challenge N_S is generated (REQ17). The Client
computes the signature by using its own private key, whose computes the signature by using its own private key, whose
corresponding public key is either directly specified in the corresponding public key is either directly specified in the
'client_cred' parameter or included in the certificate specified in 'client_cred' parameter or included in the certificate specified in
the 'client_cred' parameter. the 'client_cred' parameter.
* 'pub_keys_repos', can be present if a certificate is present in o 'pub_keys_repos', can be present if a certificate is present in
the 'client_cred' field, with value the URI of the certificate of the 'client_cred' field, with value the URI of the certificate of
the Client. This parameter is encoded as a CBOR text string. the Client. This parameter is encoded as a CBOR text string.
Alternative specific encodings of this parameter MAY be defined in Alternative specific encodings of this parameter MAY be defined in
applications of this specification (OPT3). applications of this specification (OPT3).
* 'control_path', with value a full URI, encoded as a CBOR text o 'control_path', with value a full URI, encoded as a CBOR text
string. If 'control_path' is supported by the Client, the Client string. If 'control_path' is supported by the Client, the Client
acts as a CoAP server and hosts a resource at this specific URI. acts as a CoAP server and hosts a resource at this specific URI.
The KDC MAY use this URI to send CoAP requests to the Client The KDC MAY use this URI to send CoAP requests to the Client
(acting as CoAP server in this exchange), for example for (acting as CoAP server in this exchange), for example for
individual provisioning of new keying material when performing a individual provisioning of new keying material when performing a
group rekeying (see Section 4.3), or to inform the Client of its group rekeying (see Section 4.3), or to inform the Client of its
removal from the group Section 5. If the KDC does not implement removal from the group Section 5. If the KDC does not implement
mechanisms using this resource, it can just ignore this parameter. mechanisms using this resource, it can just ignore this parameter.
Other additional functionalities of this resource MAY be defined Other additional functionalities of this resource MAY be defined
in application profiles of this specifications (OPT9). In in application profiles of this specifications (OPT9). In
skipping to change at page 19, line 21 skipping to change at page 18, line 41
group members. Application profiles MAY define optional or mandatory group members. Application profiles MAY define optional or mandatory
payload formats for specific error cases (OPT6). payload formats for specific error cases (OPT6).
If the KDC stores the group members' public keys, the handler checks If the KDC stores the group members' public keys, the handler checks
if one public key is already associated to the access token received if one public key is already associated to the access token received
(see Section 4.2 for an example) and to the group identified by (see Section 4.2 for an example) and to the group identified by
"GROUPNAME". If that is not the case, it retrieves it from the "GROUPNAME". If that is not the case, it retrieves it from the
'client_cred' field and associates it to the access token received, 'client_cred' field and associates it to the access token received,
after verifications succed. In particular, the KDC verifies: after verifications succed. In particular, the KDC verifies:
* that such public key has an acceptable format for the group o that such public key has an acceptable format for the group
identified by "GROUPNAME", i.e. it is encoded as expected and is identified by "GROUPNAME", i.e. it is encoded as expected and is
compatible with the signature algorithm and possible associated compatible with the signature algorithm and possible associated
parameters. If that cannot be verified, it is RECOMMENDED that parameters. If that cannot be verified, it is RECOMMENDED that
the handler stops the process and responds with a 4.00 (Bad the handler stops the process and responds with a 4.00 (Bad
Request) error message. Applications profiles MAY define Request) error message. Applications profiles MAY define
alternatives (OPT5). alternatives (OPT5).
* that the signature contained in "client_cred_verify" passes o that the signature contained in "client_cred_verify" passes
verification. If that cannot be verified, the handler MUST verification. If that cannot be verified, the handler MUST
respond with a 4.00 (Bad Request) error message, and if the token respond with a 4.00 (Bad Request) error message, and if the token
was posted (see REQ17) including the 'kdcchallenge' associated to was posted (see REQ17) including the 'kdcchallenge' associated to
this Client (see Section 3.3) if it can be retrieved, or otherwise this Client (see Section 3.3) if it can be retrieved, or otherwise
newly generated, in a CBOR map in the payload. This error newly generated, in a CBOR map in the payload. This error
response MUST also have Content-Format "application/ace+cbor". response MUST also have Content-Format "application/ace+cbor".
If one public key is already associated to the access token and to If one public key is already associated to the access token and to
that group, but the 'client_cred' is populated with a different that group, but the 'client_cred' is populated with a different
public key, the handler MUST delete the previous one and replace it public key, the handler MUST delete the previous one and replace it
with this one, after verifying the points above. with this one, after verifying the points above.
If the token was posted but the KDC cannot retrieve the If the token was posted but the KDC cannot retrieve the
'kdcchallenge' associated to this Client (see Section 3.3), the KDC 'kdcchallenge' associated to this Client (see Section 3.3), the KDC
MUST respond with a 4.00 Bad Request error response, including a MUST respond with a 4.00 Bad Request error response, including a
newly generated 'kdcchallenge' in a CBOR map in the payload. This newly generated 'kdcchallenge' in a CBOR map in the payload. This
error response MUST also have Content-Format "application/ace+cbor". error response MUST also have Content-Format "application/ace+cbor".
If all verifications succeed, the handler: If all verifications succeed, the handler:
* Adds the node to the list of current members of the group. o Adds the node to the list of current members of the group.
* Assigns a name NODENAME to the node, and creates a sub-resource to o Assigns a name NODENAME to the node, and creates a sub-resource to
/ace-group/GROUPNAME/ at the KDC (e.g. "/ace- /ace-group/GROUPNAME/ at the KDC (e.g. "/ace-
group/GROUPNAME/nodes/NODENAME"). group/GROUPNAME/nodes/NODENAME").
* Associates the identifier "NODENAME" with the access token and the o Associates the identifier "NODENAME" with the access token and the
secure session for that node. secure session for that node.
* If the KDC manages public keys for group members: o If the KDC manages public keys for group members:
- Adds the retrieved public key of the node to the list of public * Adds the retrieved public key of the node to the list of public
keys stored for the group identified by "GROUPNAME" keys stored for the group identified by "GROUPNAME"
- Associates the node's public key with its access token and the * Associates the node's public key with its access token and the
group identified by "GROUPNAME", if such association did not group identified by "GROUPNAME", if such association did not
already exist. already exist.
* Returns a 2.01 (Created) message containing the symmetric group o Returns a 2.01 (Created) message containing the symmetric group
keying material, the group policies and all the public keys of the keying material, the group policies and all the public keys of the
current members of the group, if the KDC manages those and the current members of the group, if the KDC manages those and the
Client requested them. Client requested them.
The response message also contains the URI path to the sub-resource The response message also contains the URI path to the sub-resource
created for that node in a Location-Path CoAP option. The payload of created for that node in a Location-Path CoAP option. The payload of
the response is formatted as a CBOR map which MUST contain the the response is formatted as a CBOR map which MUST contain the
following fields and values: following fields and values:
* 'gkty', identifying the key type of the 'key' parameter. The set o 'gkty', identifying the key type of the 'key' parameter. The set
of values can be found in the "Key Type" column of the "ACE of values can be found in the "Key Type" column of the "ACE
Groupcomm Key" Registry. Implementations MUST verify that the key Groupcomm Key" Registry. Implementations MUST verify that the key
type matches the application profile being used, if present, as type matches the application profile being used, if present, as
registered in the "ACE Groupcomm Key" registry. registered in the "ACE Groupcomm Key" registry.
* 'key', containing the keying material for the group communication, o 'key', containing the keying material for the group communication,
or information required to derive it. or information required to derive it.
* 'num', containing the version number of the keying material for o 'num', containing the version number of the keying material for
the group communication, formatted as an integer. The initial the group communication, formatted as an integer. The initial
version MUST be set to 0 at the KDC. This is a strictly monotonic version MUST be set to 0 at the KDC. This is a strictly monotonic
increasing field. increasing field.
The exact format of the 'key' value MUST be defined in applications The exact format of the 'key' value MUST be defined in applications
of this specification (REQ7), as well as accepted values of 'gkty' by of this specification (REQ7), as well as accepted values of 'gkty' by
the application (REQ8). Additionally, documents specifying the key the application (REQ8). Additionally, documents specifying the key
format MUST register it in the "ACE Groupcomm Key" registry defined format MUST register it in the "ACE Groupcomm Key" registry defined
in Section 8.5, including its name, type and application profile to in Section 8.6, including its name, type and application profile to
be used with. be used with.
+----------+----------------+---------+-------------------------+ +----------+----------------+---------+-------------------------+
| Name | Key Type Value | Profile | Description | | Name | Key Type Value | Profile | Description |
+----------+----------------+---------+-------------------------+ +----------+----------------+---------+-------------------------+
| Reserved | 0 | | This value is reserved | | Reserved | 0 | | This value is reserved |
+----------+----------------+---------+-------------------------+ +----------+----------------+---------+-------------------------+
Figure 5: Key Type Values Figure 5: Key Type Values
Optionally, the response MAY contain the following parameters, which, Optionally, the response MAY contain the following parameters, which,
if included, MUST have the corresponding values: if included, MUST have the corresponding values:
* 'ace-groupcomm-profile', with value a CBOR integer that MUST be o 'ace-groupcomm-profile', with value a CBOR integer that MUST be
used to uniquely identify the application profile for group used to uniquely identify the application profile for group
communication. Applications of this specification MUST register communication. Applications of this specification MUST register
an application profile identifier and the related value for this an application profile identifier and the related value for this
parameter in the "ACE Groupcomm Profile" Registry (REQ12). parameter in the "ACE Groupcomm Profile" Registry (REQ12).
* 'exp', with value the expiration time of the keying material for o 'exp', with value the expiration time of the keying material for
the group communication, encoded as a CBOR unsigned integer. This the group communication, encoded as a CBOR unsigned integer. This
field contains a numeric value representing the number of seconds field contains a numeric value representing the number of seconds
from 1970-01-01T00:00:00Z UTC until the specified UTC date/time, from 1970-01-01T00:00:00Z UTC until the specified UTC date/time,
ignoring leap seconds, analogous to what specified for NumericDate ignoring leap seconds, analogous to what specified for NumericDate
in Section 2 of [RFC7519]. Group members MUST stop using the in Section 2 of [RFC7519]. Group members MUST stop using the
keying material to protect outgoing messages and retrieve new keying material to protect outgoing messages and retrieve new
keying material at the time indicated in this field. keying material at the time indicated in this field.
* 'exp_delta', with value the time interval (starting at 'exp') o 'exp_delta', with value the time interval (starting at 'exp')
during which the keying material for the group communication can during which the keying material for the group communication can
still be used for verifying incoming messages, encoded as a CBOR still be used for verifying incoming messages, encoded as a CBOR
unsigned integer. This field contains a numeric value unsigned integer. This field contains a numeric value
representing the number of seconds from 'exp' until the specified representing the number of seconds from 'exp' until the specified
UTC date/time after which group members MUST stop using the keying UTC date/time after which group members MUST stop using the keying
material to verify incoming messages. material to verify incoming messages.
* 'pub_keys', may only be present if 'get_pub_keys' was present in o 'pub_keys', may only be present if 'get_pub_keys' was present in
the request. This parameter is a CBOR byte string, which encodes the request. This parameter is a CBOR byte string, which encodes
the public keys of all the group members paired with the the public keys of all the group members paired with the
respective member identifiers. The default encoding for public respective member identifiers. The default encoding for public
keys is COSE Keys, so the default encoding for 'pub_keys' is a keys is COSE Keys, so the default encoding for 'pub_keys' is a
CBOR byte string wrapping a COSE_KeySet (see [RFC8152]), which CBOR byte string wrapping a COSE_KeySet (see
contains the public keys of all the members of the group. In [I-D.ietf-cose-rfc8152bis-struct]), which contains the public keys
particular, each COSE Key in the COSE_KeySet includes the of all the members of the group. In particular, each COSE Key in
identifier of the corresponding group member as value of its 'kid' the COSE_KeySet includes the identifier of the corresponding group
key parameter. Alternative specific encodings of this parameter member as value of its 'kid' key parameter. Alternative specific
MAY be defined in applications of this specification (OPT1). The encodings of this parameter MAY be defined in applications of this
specific format of the identifiers of group members MUST be specification (OPT1). The specific format of the identifiers of
specified in the application profile (REQ9). group members MUST be specified in the application profile (REQ9).
* 'peer_roles', MUST be present if 'pub_keys' is present. This o 'peer_roles', MUST be present if 'pub_keys' is present. This
parameter is a CBOR array of n elements, with n the number of parameter is a CBOR array of n elements, with n the number of
members in the group (and number of public keys included in the members in the group (and number of public keys included in the
'pub_keys' parameter). The i-th element of the array specifies 'pub_keys' parameter). The i-th element of the array specifies
the role (or CBOR array of roles) that the group member associated the role (or CBOR array of roles) that the group member associated
to the i-th public key in 'pub_keys' has in the group. In to the i-th public key in 'pub_keys' has in the group. In
particular, each array element is encoded as the role element of a particular, each array element is encoded as the role element of a
scope entry, as defined in Section 3.1. scope entry, as defined in Section 3.1.
* 'group_policies', with value a CBOR map, whose entries specify how o 'group_policies', with value a CBOR map, whose entries specify how
the group handles specific management aspects. These include, for the group handles specific management aspects. These include, for
instance, approaches to achieve synchronization of sequence instance, approaches to achieve synchronization of sequence
numbers among group members. The elements of this field are numbers among group members. The elements of this field are
registered in the "ACE Groupcomm Policy" Registry. This registered in the "ACE Groupcomm Policy" Registry. This
specification defines the two elements "Sequence Number specification defines the two elements "Sequence Number
Synchronization Method" and "Key Update Check Interval", which are Synchronization Method" and "Key Update Check Interval", which are
summarized in Figure 6. Application profiles that build on this summarized in Figure 6. Application profiles that build on this
document MUST specify the exact content format of included map document MUST specify the exact content format of included map
entries (REQ14). entries (REQ14).
skipping to change at page 22, line 48 skipping to change at page 22, line 28
| | | | Synchronization | | | | | | Synchronization | |
| | | | Method registry | | | | | | Method registry | |
| | | | | | | | | | | |
| Key Update | TBD2 | int | Polling interval | [[this | | Key Update | TBD2 | int | Polling interval | [[this |
| Check | | | in seconds, to | document]] | | Check | | | in seconds, to | document]] |
| Interval | | | check for new | | | Interval | | | check for new | |
| | | | keying material at | | | | | | keying material at | |
| | | | the KDC | | | | | | the KDC | |
+--------------+-------+----------|--------------------|------------+ +--------------+-------+----------|--------------------|------------+
Figure 6: ACE Groupcomm Policies Figure 6: ACE Groupcomm Policies
* 'mgt_key_material', encoded as a CBOR byte string and containing o 'mgt_key_material', encoded as a CBOR byte string and containing
the administrative keying material to participate in the group the administrative keying material to participate in the group
rekeying performed by the KDC. The application profile MUST rekeying performed by the KDC. The application profile MUST
define if this field is used, and if used then MUST specify the define if this field is used, and if used then MUST specify the
exact format and content which depend on the specific rekeying exact format and content which depend on the specific rekeying
scheme used in the group. If the usage of 'mgt_key_material' is scheme used in the group. If the usage of 'mgt_key_material' is
indicated and its format defined for a specific key management indicated and its format defined for a specific key management
scheme, that format must explicitly indicate the key management scheme, that format must explicitly indicate the key management
scheme itself. If a new rekeying scheme is defined to be used for scheme itself. If a new rekeying scheme is defined to be used for
an existing 'mgt_key_material' in an existing profile, then that an existing 'mgt_key_material' in an existing profile, then that
profile will have to be updated accordingly, especially with profile will have to be updated accordingly, especially with
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4.1.3.1. FETCH Handler 4.1.3.1. FETCH Handler
The FETCH handler receives identifiers of group members for the group The FETCH handler receives identifiers of group members for the group
identified by "GROUPNAME" and returns the public keys of such group identified by "GROUPNAME" and returns the public keys of such group
members. members.
The handler expects a request with payload formatted as a CBOR map. The handler expects a request with payload formatted as a CBOR map.
The payload of this request is a CBOR Map that MUST contain the The payload of this request is a CBOR Map that MUST contain the
following fields: following fields:
* 'get_pub_keys', whose value is a non-empty CBOR array containing o 'get_pub_keys', whose value is a non-empty CBOR array containing
two CBOR arrays: two CBOR arrays:
- The first array contains zero or more roles (or combination of * The first array contains zero or more roles (or combination of
roles) of group members for the group identified by roles) of group members for the group identified by
"GROUPNAME". "GROUPNAME".
- The second array contains zero or more identifiers of group * The second array contains zero or more identifiers of group
members for the group identified by "GROUPNAME". members for the group identified by "GROUPNAME".
The CDDL definition of 'get_pub_keys' is given in Figure 7 using as The CDDL definition [RFC8610] of 'get_pub_keys' is given in Figure 7
example encoding: node identifier encoded as byte string, role using as example encoding: node identifier encoded as byte string,
identifier as text string, and combination of roles encoded as a CBOR role identifier as text string, and combination of roles encoded as a
array of roles. Note that the empty array is not valid for this CBOR array of roles. Note that the empty array is not valid for this
handler, but is valid for the value of "get_pub_keys" received by the handler, but is valid for the value of "get_pub_keys" received by the
handler of POST to ace-group/GROUPNAME (see Section 4.1.2.1). handler of POST to ace-group/GROUPNAME (see Section 4.1.2.1).
id = bstr id = bstr
role = tstr role = tstr
comb_role = [ 2*role ] comb_role = [ 2*role ]
get_pub_keys = [ [ *(role / comb_role) ], [ *id ] ] / [ ] get_pub_keys = [ [ *(role / comb_role) ], [ *id ] ] / [ ]
Figure 7: CDLL definition of get_pub_keys, using as example node Figure 7: CDLL definition of get_pub_keys, using as example node
identifier encoded as bstr and role as tstr identifier encoded as bstr and role as tstr
The specific format of public keys as well as identifiers, roles and The specific format of public keys as well as identifiers, roles and
combination of roles of group members MUST be specified by the combination of roles of group members MUST be specified by the
application profile (OPT1, REQ2, REQ9). application profile (OPT1, REQ2, REQ9).
The handler verifies that the group identifier of the /ace-group/ The handler verifies that the group identifier of the /ace-group/
GROUPNAME path is a subset of the 'scope' stored in the access token GROUPNAME path is a subset of the 'scope' stored in the access token
associated to this client. If verification fails, the KDC MUST associated to this client. If verification fails, the KDC MUST
respond with a 4.01 (Unauthorized) error message. respond with a 4.01 (Unauthorized) error message.
skipping to change at page 25, line 35 skipping to change at page 25, line 17
payload formatted as a CBOR byte string of zero length. The specific payload formatted as a CBOR byte string of zero length. The specific
format of public keys as well as of identifiers of group members is format of public keys as well as of identifiers of group members is
specified by the application profile (OPT1, REQ9). specified by the application profile (OPT1, REQ9).
The handler MAY enforce one of the following policies, in order to The handler MAY enforce one of the following policies, in order to
handle possible identifiers that are included in the 'get_pub_keys' handle possible identifiers that are included in the 'get_pub_keys'
parameter of the request but are not associated to any current group parameter of the request but are not associated to any current group
member. Such a policy MUST be specified by the application profile member. Such a policy MUST be specified by the application profile
(REQ13) (REQ13)
* The KDC silently ignores those identifiers. o The KDC silently ignores those identifiers.
* The KDC retains public keys of group members for a given amount of o The KDC retains public keys of group members for a given amount of
time after their leaving, before discarding them. As long as such time after their leaving, before discarding them. As long as such
public keys are retained, the KDC provides them to a requesting public keys are retained, the KDC provides them to a requesting
Client. Client.
Note that this resource handlers only verify that the node is Note that this resource handlers only verify that the node is
authorized by the AS to access this resource. Nodes that are not authorized by the AS to access this resource. Nodes that are not
members of the group but are authorized to do signature verifications members of the group but are authorized to do signature verifications
on the group messages may be allowed to access this resource, if the on the group messages may be allowed to access this resource, if the
application needs it. application needs it.
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of the group. If verification fails, the KDC MUST respond with a of the group. If verification fails, the KDC MUST respond with a
4.00 (Bad Request) error message. 4.00 (Bad Request) error message.
If verification succeeds, the handler returns a 2.05 (Content) If verification succeeds, the handler returns a 2.05 (Content)
message containing newly-generated individual keying material for the message containing newly-generated individual keying material for the
Client, or information enabling the Client to derive it. The payload Client, or information enabling the Client to derive it. The payload
of the response is formatted as a CBOR map. The specific format of of the response is formatted as a CBOR map. The specific format of
newly-generated individual keying material for group members, or of newly-generated individual keying material for group members, or of
the information to derive it, and corresponding CBOR label, MUST be the information to derive it, and corresponding CBOR label, MUST be
specified in the application profile (REQ15) and registered in specified in the application profile (REQ15) and registered in
Section 8.4. Section 8.5.
4.1.6.2. GET Handler 4.1.6.2. GET Handler
The handler expects a GET request. The handler expects a GET request.
The handler verifies that the group identifier of the /ace-group/ The handler verifies that the group identifier of the /ace-group/
GROUPNAME path is a subset of the 'scope' stored in the access token GROUPNAME path is a subset of the 'scope' stored in the access token
associated to this client, identified by "NODENAME". If verification associated to this client, identified by "NODENAME". If verification
fails, the KDC MUST respond with a 4.01 (Unauthorized) error message. fails, the KDC MUST respond with a 4.01 (Unauthorized) error message.
skipping to change at page 28, line 48 skipping to change at page 28, line 23
4.00 (Bad Request) error message. 4.00 (Bad Request) error message.
If verification succeeds, the handler returns a 2.05 (Content) If verification succeeds, the handler returns a 2.05 (Content)
message containing both the group keying material and the individual message containing both the group keying material and the individual
keying material for the Client, or information enabling the Client to keying material for the Client, or information enabling the Client to
derive it. The payload of the response is formatted as a CBOR map. derive it. The payload of the response is formatted as a CBOR map.
The format for the group keying material is the same as defined in The format for the group keying material is the same as defined in
the response of Section 4.1.2.2. The specific format of individual the response of Section 4.1.2.2. The specific format of individual
keying material for group members, or of the information to derive keying material for group members, or of the information to derive
it, and corresponding CBOR label, MUST be specified in the it, and corresponding CBOR label, MUST be specified in the
application profile (REQ15) and registered in Section 8.4. application profile (REQ15) and registered in Section 8.5.
4.1.6.3. DELETE Handler 4.1.6.3. DELETE Handler
The DELETE handler removes the node identified by "NODENAME" from the The DELETE handler removes the node identified by "NODENAME" from the
group identified by "GROUPNAME". group identified by "GROUPNAME".
The handler expects a request with method DELETE (and empty payload). The handler expects a request with method DELETE (and empty payload).
The handler only accept a request from the node that matches the The handler only accept a request from the node that matches the
"NODENAME" used in Uri-Path, and that is part of the "GROUPNAME" "NODENAME" used in Uri-Path, and that is part of the "GROUPNAME"
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Figure 8 gives an overview of the Joining exchange between Client and Figure 8 gives an overview of the Joining exchange between Client and
KDC, when the Client first joins a group. KDC, when the Client first joins a group.
Client KDC Client KDC
| | | |
|----- Joining Request: POST /ace-group/GROUPNAME ------>| |----- Joining Request: POST /ace-group/GROUPNAME ------>|
| | | |
|<--------- Joining Response: 2.01 (Created) ----------- | |<--------- Joining Response: 2.01 (Created) ----------- |
| Location-Path = "/ace-group/GROUPNAME/nodes/NODENAME" | | Location-Path = "/ace-group/GROUPNAME/nodes/NODENAME" |
Figure 8: Message Flow of First Exchange for Group Joining Figure 8: Message Flow of First Exchange for Group Joining
If not previously established, the Client and the KDC MUST first If not previously established, the Client and the KDC MUST first
establish a pairwise secure communication channel (REQ16). This can establish a pairwise secure communication channel (REQ16). This can
be achieved, for instance, by using a transport profile of ACE. The be achieved, for instance, by using a transport profile of ACE. The
Joining exchange MUST occur over that secure channel. The Client and Joining exchange MUST occur over that secure channel. The Client and
the KDC MAY use that same secure channel to protect further pairwise the KDC MAY use that same secure channel to protect further pairwise
communications that must be secured. communications that must be secured.
The secure communication protocol is REQUIRED to establish the secure The secure communication protocol is REQUIRED to establish the secure
channel by using the proof-of-possession key bound to the access channel between Client and KDC by using the proof-of-possession key
token. As a result, the proof-of-possession to bind the access token bound to the access token. As a result, the proof-of-possession to
to the Client is performed by using the proof-of-possession key bound bind the access token to the Client is performed by using the proof-
to the access token for establishing secure communication between the of-possession key bound to the access token for establishing secure
Client and the KDC. communication between the Client and the KDC.
To join the group, the Client sends a CoAP POST request to the /ace- To join the group, the Client sends a CoAP POST request to the /ace-
group/GROUPNAME endpoint at the KDC, where GROUPNAME is the group group/GROUPNAME endpoint at the KDC, where GROUPNAME is the group
identifier of the group to join, formatted as specified in identifier of the group to join, formatted as specified in
Section 4.1.2.1. This group identifier is the same as the scope Section 4.1.2.1. This group identifier is the same as in the scope
entry corresponding to that group, specified in the 'scope' parameter entry corresponding to that group, specified in the 'scope' parameter
of the Authorization Request/Response, or it can be retrieved from of the Authorization Request/Response, or it can be retrieved from
it. Note that, in case of successful joining, the Client will it. Note that, in case of successful joining, the Client will
receive the URI to retrieve individual or group keying material and receive the URI to retrieve individual or group keying material and
to leave the group in the Location-Path option of the response. to leave the group in the Location-Path option of the response.
If the node is joining a group for the first time, and the KDC If the node is joining a group for the first time, and the KDC
maintains the public keys of the group members, the Client is maintains the public keys of the group members, the Client is
REQUIRED to send its own public key and proof of possession REQUIRED to send its own public key and proof of possession
("client_cred" and "client_cred_verify" in Section 4.1.2.1). The ("client_cred" and "client_cred_verify" in Section 4.1.2.1). The
skipping to change at page 32, line 21 skipping to change at page 31, line 37
different resources at the KDC (Section 4.1.2.2, Section 4.1.3.2, different resources at the KDC (Section 4.1.2.2, Section 4.1.3.2,
Section 4.1.4.1). After distributing the new group keying material, Section 4.1.4.1). After distributing the new group keying material,
the KDC MUST increment the version number of the keying material. the KDC MUST increment the version number of the keying material.
4.3. Retrieval of Updated Keying Material 4.3. Retrieval of Updated Keying Material
When any of the following happens, a node MUST stop using the owned When any of the following happens, a node MUST stop using the owned
group keying material to protect outgoing messages, and SHOULD stop group keying material to protect outgoing messages, and SHOULD stop
using it to decrypt and verify incoming messages. using it to decrypt and verify incoming messages.
* Upon expiration of the keying material, according to what o Upon expiration of the keying material, according to what
indicated by the KDC with the 'exp' (and possibly the 'exp_delta') indicated by the KDC with the 'exp' (and possibly the 'exp_delta')
parameter in a Joining Response, or to a pre-configured value. parameter in a Joining Response, or to a pre-configured value.
* Upon receiving a notification of revoked/renewed keying material o Upon receiving a notification of revoked/renewed keying material
from the KDC, possibly as part of an update of the keying material from the KDC, possibly as part of an update of the keying material
(rekeying) triggered by the KDC. (rekeying) triggered by the KDC.
* Upon receiving messages from other group members without being o Upon receiving messages from other group members without being
able to retrieve the keying material to correctly decrypt them. able to retrieve the keying material to correctly decrypt them.
This may be due to rekeying messages previously sent by the KDC, This may be due to rekeying messages previously sent by the KDC,
that the Client was not able to receive or decrypt. that the Client was not able to receive or decrypt.
In either case, if it wants to continue participating in the group In either case, if it wants to continue participating in the group
communication, the node has to request the latest keying material communication, the node has to request the latest keying material
from the KDC. To this end, the Client sends a CoAP GET request to from the KDC. To this end, the Client sends a CoAP GET request to
the /ace-group/GROUPNAME/nodes/NODENAME endpoint at the KDC, the /ace-group/GROUPNAME/nodes/NODENAME endpoint at the KDC,
formatted as specified in Section 4.1.6.2. formatted as specified in Section 4.1.6.2.
skipping to change at page 33, line 26 skipping to change at page 32, line 41
| GET ace-group/GROUPNAME/nodes/NODENAME | | GET ace-group/GROUPNAME/nodes/NODENAME |
| | | |
|<-------- Key Distribution Response: 2.05 (Content) ---------| |<-------- Key Distribution Response: 2.05 (Content) ---------|
| | | |
Figure 9: Message Flow of Key Distribution Request-Response Figure 9: Message Flow of Key Distribution Request-Response
Alternatively, the re-distribution of keying material can be Alternatively, the re-distribution of keying material can be
initiated by the KDC, which e.g.: initiated by the KDC, which e.g.:
* Can make the ace-group/GROUPNAME/nodes/NODENAME resource o Can make the ace-group/GROUPNAME/nodes/NODENAME resource
Observable, and send notifications to Clients when the keying Observable [RFC7641], and send notifications to Clients when the
material is updated. keying material is updated.
* Can send the payload of the Key Distribution Response in one or o Can send the payload of the Key Distribution Response in one or
multiple multicast POST requests to the members of the group, multiple multicast POST requests to the members of the group,
using secure rekeying schemes such as [RFC2093][RFC2094][RFC2627]. using secure rekeying schemes such as [RFC2093][RFC2094][RFC2627].
* Can send unicast POST requests to each Client over a secure o Can send unicast POST requests to each Client over a secure
channel, with the same payload as the Key Distribution Response. channel, with the same payload as the Key Distribution Response.
When sending such requests, the KDC can target the URI path When sending such requests, the KDC can target the URI path
possibly provided by the intended recipient upon joining the possibly provided by the intended recipient upon joining the
group, as specified in the 'control_path' parameter of the Joining group, as specified in the 'control_path' parameter of the Joining
Request (see Section 4.1.2.1). Request (see Section 4.1.2.1).
* Can act as a publisher in a pub-sub scenario, and update the o Can act as a publisher in a pub-sub scenario, and update the
keying material by publishing on a specific topic on a broker, keying material by publishing on a specific topic on a broker,
which all the members of the group are subscribed to. which all the members of the group are subscribed to.
Note that these methods of KDC-initiated key distribution have Note that these methods of KDC-initiated key distribution have
different security properties and require different security different security properties and require different security
associations. associations. Moreover, congestion control mechanism need to be
implemented where Observe is used, see Section 4.5.1 of [RFC7641].
4.4. Retrieval of New Keying Material 4.4. Retrieval of New Keying Material
Beside possible expiration and depending on what part of the keying Beside possible expiration and depending on what part of the keying
material is no longer eligible to be used, the client may need to material is no longer eligible to be used, the client may need to
communicate to the KDC its need for that part to be renewed. For communicate to the KDC its need for that part to be renewed. For
example, if the Client uses an individual key to protect outgoing example, if the Client uses an individual key to protect outgoing
traffic and has to renew it, the node may request a new one, or new traffic and has to renew it, the node may request a new one, or new
input material to derive it, without renewing the whole group keying input material to derive it, without renewing the whole group keying
material. material.
skipping to change at page 35, line 19 skipping to change at page 34, line 32
Figure 11 and Figure 12 give an overview of the exchanges described Figure 11 and Figure 12 give an overview of the exchanges described
above. above.
Client KDC Client KDC
| | | |
|--Public Key Request: GET /ace-group/GROUPNAME/pub-key->| |--Public Key Request: GET /ace-group/GROUPNAME/pub-key->|
| | | |
|<--------- Public Key Response: 2.05 (Content) ---------| |<--------- Public Key Response: 2.05 (Content) ---------|
| | | |
Figure 11: Message Flow of Public Key Exchange to Request All Figure 11: Message Flow of Public Key Exchange to Request All Members
Members Public Keys Public Keys
Client KDC Client KDC
| | | |
|-Public Key Request: FETCH /ace-group/GROUPNAME/pub-key->| |-Public Key Request: FETCH /ace-group/GROUPNAME/pub-key->|
| | | |
|<--------- Public Key Response: 2.05 (Created) ----------| |<--------- Public Key Response: 2.05 (Created) ----------|
| | | |
Figure 12: Message Flow of Public Key Exchange to Request Figure 12: Message Flow of Public Key Exchange to Request Specific
Specific Members Public Keys Members Public Keys
4.6. Update of Public Key 4.6. Update of Public Key
In case the KDC maintains the public keys of group members, a node in In case the KDC maintains the public keys of group members, a node in
the group can contact the KDC to upload a new public key to use in the group can contact the KDC to upload a new public key to use in
the group, and replace the currently stored one. the group, and replace the currently stored one.
To this end, the Client performs a Public Key Update Request/Response To this end, the Client performs a Public Key Update Request/Response
exchange with the KDC, i.e. it sends a CoAP POST request to the /ace- exchange with the KDC, i.e. it sends a CoAP POST request to the /ace-
group/GROUPNAME/nodes/NODENAME/pub-key endpoint at the KDC, where group/GROUPNAME/nodes/NODENAME/pub-key endpoint at the KDC, where
skipping to change at page 36, line 48 skipping to change at page 36, line 12
Figure 14 gives an overview of the exchange described above. Figure 14 gives an overview of the exchange described above.
Client KDC Client KDC
| | | |
|-Policies Request: GET ace-group/GROUPNAME/policies ->| |-Policies Request: GET ace-group/GROUPNAME/policies ->|
| | | |
|<--------- Policies Response: 2.05 (Content) ---------| |<--------- Policies Response: 2.05 (Content) ---------|
| | | |
Figure 14: Message Flow of Policies Request-Response Figure 14: Message Flow of Policies Request-Response
4.8. Retrieval of Keying Material Version 4.8. Retrieval of Keying Material Version
A node in the group can contact the KDC to request information about A node in the group can contact the KDC to request information about
the version number of the symmetric group keying material, by sending the version number of the symmetric group keying material, by sending
a CoAP GET request to the /ace-group/GROUPNAME/ctx-num endpoint at a CoAP GET request to the /ace-group/GROUPNAME/ctx-num endpoint at
the KDC, where GROUPNAME is the group identifier, formatted as the KDC, where GROUPNAME is the group identifier, formatted as
defined in Section 4.1.5.1. In particular, the version is defined in Section 4.1.5.1. In particular, the version is
incremented by the KDC every time the group keying material is incremented by the KDC every time the group keying material is
renewed. renewed.
skipping to change at page 39, line 5 skipping to change at page 38, line 5
Joining Request. Joining Request.
6. ACE Groupcomm Parameters 6. ACE Groupcomm Parameters
This specification defines a number of fields used during the second This specification defines a number of fields used during the second
part of the message exchange, after the ACE Token POST exchange. The part of the message exchange, after the ACE Token POST exchange. The
table below summarizes them, and specifies the CBOR key to use table below summarizes them, and specifies the CBOR key to use
instead of the full descriptive name. Note that the media type ace- instead of the full descriptive name. Note that the media type ace-
groupcomm+cbor MUST be used when these fields are transported. groupcomm+cbor MUST be used when these fields are transported.
+-----------------------+------+---------------+------------------+ +-----------------------+------+-----------------+------------------+
| Name | CBOR | CBOR Type | Reference | | Name | CBOR | CBOR Type | Reference |
| | Key | | | | | Key | | |
+=======================+======+===============+==================+ +-----------------------+------+-----------------+------------------+
| scope | TBD | byte string | Section 4.1.2.1 | | scope | TBD | byte string | Section 4.1.2.1 |
+-----------------------+------+---------------+------------------+ | | | | |
| get_pub_keys | TBD | array | Section 4.1.2.1, | | get_pub_keys | TBD | array | Section 4.1.2.1, |
| | | | Section 4.1.3.1 | | | | | Section 4.1.3.1 |
+-----------------------+------+---------------+------------------+ | | | | |
| client_cred | TBD | byte string | Section 4.1.2.1 | | client_cred | TBD | byte string | Section 4.1.2.1 |
+-----------------------+------+---------------+------------------+ | | | | |
| cnonce | TBD | byte string | Section 4.1.2.1 | | cnonce | TBD | byte string | Section 4.1.2.1 |
+-----------------------+------+---------------+------------------+ | | | | |
| client_cred_verify | TBD | byte string | Section 4.1.2.1 | | client_cred_verify | TBD | byte string | Section 4.1.2.1 |
+-----------------------+------+---------------+------------------+ | | | | |
| pub_keys_repos | TBD | text string | Section 4.1.2.1 | | pub_keys_repos | TBD | text string | Section 4.1.2.1 |
+-----------------------+------+---------------+------------------+ | | | | |
| control_path | TBD | text string | Section 4.1.2.1 | | control_path | TBD | text string | Section 4.1.2.1 |
+-----------------------+------+---------------+------------------+ | | | | |
| gkty | TBD | int / text | Section 4.1.2.1 | | gkty | TBD | int / text | Section 4.1.2.1 |
| | | string | | | | | string | |
+-----------------------+------+---------------+------------------+ | | | | |
| key | TBD | see "ACE | Section 4.1.2.1 | | key | TBD | see "ACE | Section 4.1.2.1 |
| | | Groupcomm | | | | | Groupcomm Key" | |
| | | Key" Registry | | | | | Registry | |
+-----------------------+------+---------------+------------------+ | | | | |
| num | TBD | int | Section 4.1.2.1 | | num | TBD | int | Section 4.1.2.1 |
+-----------------------+------+---------------+------------------+ | | | | |
| ace-groupcomm-profile | TBD | int | Section 4.1.2.1 | | ace-groupcomm-profile | TBD | int | Section 4.1.2.1 |
+-----------------------+------+---------------+------------------+ | | | | |
| exp | TBD | int | Section 4.1.2.1 | | exp | TBD | int | Section 4.1.2.1 |
+-----------------------+------+---------------+------------------+ | | | | |
| exp_delta | TBD | int | Section 4.1.2.1 | | exp_delta | TBD | int | Section 4.1.2.1 |
+-----------------------+------+---------------+------------------+ | | | | |
| pub_keys | TBD | byte string | Section 4.1.2.1 | | pub_keys | TBD | byte string | Section 4.1.2.1 |
+-----------------------+------+---------------+------------------+ | | | | |
| peer_roles | TBD | array | Section 4.1.2.1 | | peer_roles | TBD | array | Section 4.1.2.1 |
+-----------------------+------+---------------+------------------+ | | | | |
| group_policies | TBD | map | Section 4.1.2.1 | | group_policies | TBD | map | Section 4.1.2.1 |
+-----------------------+------+---------------+------------------+ | | | | |
| mgt_key_material | TBD | byte string | Section 4.1.2.1 | | mgt_key_material | TBD | byte string | Section 4.1.2.1 |
+-----------------------+------+---------------+------------------+ +-----------------------+------+-----------------+------------------+
Table 1
7. Security Considerations 7. Security Considerations
When a Client receives a message from a sender for the first time, it When a Client receives a message from a sender for the first time, it
needs to have a mechanism in place to avoid replay, e.g. needs to have a mechanism in place to avoid replay, e.g.
Appendix B.2 of [RFC8613]. In case the Client rebooted and lost the Appendix B.2 of [RFC8613]. In case the Client rebooted and lost the
security state used to protect previous communication with that security state used to protect previous communication with that
sender, such a mechanism is useful for the recipient to be on the sender, such a mechanism is useful for the recipient to be on the
safe side. If the group has renewed its group keying material, the safe side. If the group has renewed its group keying material, the
time window between the end of the rekeying process and the next loss time window between the end of the rekeying process and the next loss
of security state is safe for recipients, as replayed older messages of security state is safe for recipients, as replayed older messages
protected with previous keying material will not be accepted. protected with previous keying material will not be accepted.
The KDC must renew the group keying material upon its expiration. The KDC must renew the group keying material upon its expiration.
The KDC should renew the keying material upon group membership The KDC should renew the keying material upon group membership
change, and should provide it to the current group members through change, and should provide it to the current group members through
the rekeying scheme used in the group. the rekeying scheme used in the group.
The KDC should renew the group keying material after rebooting, even
in the case where all keying material is stored in persistent
storage. However, if the KDC relies on Observe responses to notify
the group of renewed keying material, after rebooting the KDC will
have lost all the Observations up to that point, and the previous
keying material will be used to protect messages in the group anyway.
The KDC will rely on each node requesting updates of the group keying
material to establish the new keying material in the nodes, or, if
implemented, it can push the update to the nodes in the group using
the 'control_path' resource.
The KDC may enforce a rekeying policy that takes into account the The KDC may enforce a rekeying policy that takes into account the
overall time required to rekey the group, as well as the expected overall time required to rekey the group, as well as the expected
rate of changes in the group membership. rate of changes in the group membership.
That is, the KDC may not rekey the group at every membership change, That is, the KDC may not rekey the group at every membership change,
for instance if members' joining and leaving occur frequently and for instance if members' joining and leaving occur frequently and
performing a group rekeying takes too long. Instead, the KDC may performing a group rekeying takes too long. Instead, the KDC may
rekey the group after a minimum number of group members have joined rekey the group after a minimum number of group members have joined
or left within a given time interval, or during predictable network or left within a given time interval, or during predictable network
inactivity periods. inactivity periods.
skipping to change at page 40, line 46 skipping to change at page 40, line 5
could be able to access the keying material used before their could be able to access the keying material used before their
joining, and thus could access past group communications. Also, joining, and thus could access past group communications. Also,
until the KDC performs a group rekeying, the newly leaving nodes until the KDC performs a group rekeying, the newly leaving nodes
would still be able to access upcoming group communications that are would still be able to access upcoming group communications that are
protected with the keying material that has not yet been updated. protected with the keying material that has not yet been updated.
The KDC needs to have a mechanism in place to detect DoS attacks from The KDC needs to have a mechanism in place to detect DoS attacks from
nodes constantly initiating rekeys (for example by updating their nodes constantly initiating rekeys (for example by updating their
public key), such as removing these nodes from the group. public key), such as removing these nodes from the group.
The KDC also needs to have a congestion control mechanism in place to
avoid network congestion when the KDC renews the group keying
material; CoAP and Observe give guidancee on such mechanisms, see
Section 4.7 of [RFC7252] and Section 4.5.1 of [RFC7641].
7.1. Update of Keying Material 7.1. Update of Keying Material
A group member can receive a message shortly after the group has been A group member can receive a message shortly after the group has been
rekeyed, and new keying material has been distributed by the KDC. In rekeyed, and new keying material has been distributed by the KDC. In
the following two cases, this may result in misaligned keying the following two cases, this may result in misaligned keying
material between the group members. material between the group members.
In the first case, the sender protects a message using the old keying In the first case, the sender protects a message using the old keying
material. However, the recipient receives the message after having material. However, the recipient receives the message after having
received the new keying material, hence not being able to correctly received the new keying material, hence not being able to correctly
skipping to change at page 42, line 44 skipping to change at page 42, line 4
authorization servers, clients and resource servers that support the authorization servers, clients and resource servers that support the
ACE groupcomm framework as specified in [this document]. ACE groupcomm framework as specified in [this document].
Additional information: Additional information:
Magic number(s): n/a Magic number(s): n/a
File extension(s): .ace-groupcomm File extension(s): .ace-groupcomm
Macintosh file type code(s): n/a Macintosh file type code(s): n/a
Person & email address to contact for further information: Person & email address to contact for further information:
iesg@ietf.org (mailto:iesg@ietf.org) iesg@ietf.org [1]
Intended usage: COMMON Intended usage: COMMON
Restrictions on usage: None Restrictions on usage: None
Author: Francesca Palombini francesca.palombini@ericsson.com
(mailto:francesca.palombini@ericsson.com) Author: Francesca Palombini francesca.palombini@ericsson.com [2]
Change controller: IESG Change controller: IESG
8.2. CoAP Content-Formats Registry 8.2. CoAP Content-Formats Registry
This specification registers the following entry to the "CoAP This specification registers the following entry to the "CoAP
Content-Formats" registry, within the "CoRE Parameters" registry: Content-Formats" registry, within the "CoRE Parameters" registry:
Media Type: application/ace-groupcomm+cbor Media Type: application/ace-groupcomm+cbor
Encoding: - Encoding: -
ID: TBD ID: TBD
Reference: [this document] Reference: [this document]
8.3. ACE Authorization Server Request Creation Hints Registry 8.3. OAuth Parameters Registry
IANA is asked to register the following entries in the "ACE
Authorization Server Request Creation Hints" Registry defined in
Section 8.1 of [I-D.ietf-ace-oauth-authz].
* Name: sign_info
* CBOR Key: TBD (range -256 to 255)
* Value Type: any
* Reference: [[This specification]] The following registrations are done for the OAuth ParametersRegistry
following the procedure specified in section 11.2 of [RFC6749]:
* Name: pub_key_enc o Parameter name: sign_info o Parameter usage location: token
request, token response o Change Controller: IESG o Specification
Document(s): [[This specification]]
* CBOR Key: TBD (range -256 to 255) o Parameter name: pub_key_enc o Parameter usage location: token
request, token response o Change Controller: IESG o Specification
Document(s): [[This specification]]
* Value Type: integer o Parameter name: kdcchallenge o Parameter usage location: token
response o Change Controller: IESG o Specification Document(s):
[[This specification]]
* Reference: [[This specification]] 8.4. OAuth Parameters CBOR Mappings Registry
* Name: kdcchallenge The following registrations are done for the OAuth Parameters CBOR
Mappings Registry following the procedure specified in section 8.9 of
[I-D.ietf-ace-oauth-authz]:
* CBOR Key: TBD (range -256 to 255) * Name: sign_info
* CBOR Key: TBD (range -256 to 255)
* Value Type: any
* Reference: \[\[This specification\]\]
* Value Type: byte string * Name: pub_key_enc
* CBOR Key: TBD (range -256 to 255)
* Value Type: integer
* Reference: \[\[This specification\]\]
* Reference: [[This specification]] * Name: kdcchallenge
* CBOR Key: TBD (range -256 to 255)
* Value Type: byte string
* Reference: \[\[This specification\]\]
8.4. ACE Groupcomm Parameters Registry 8.5. ACE Groupcomm Parameters Registry
This specification establishes the "ACE Groupcomm Parameters" IANA This specification establishes the "ACE Groupcomm Parameters" IANA
Registry. The Registry has been created to use the "Expert Review Registry. The Registry has been created to use the "Expert Review
Required" registration procedure [RFC8126]. Expert review guidelines Required" registration procedure [RFC8126]. Expert review guidelines
are provided in Section 8.10. are provided in Section 8.11.
The columns of this Registry are: The columns of this Registry are:
* Name: This is a descriptive name that enables easier reference to o Name: This is a descriptive name that enables easier reference to
the item. The name MUST be unique. It is not used in the the item. The name MUST be unique. It is not used in the
encoding. encoding.
* CBOR Key: This is the value used as CBOR key of the item. These o CBOR Key: This is the value used as CBOR key of the item. These
values MUST be unique. The value can be a positive integer, a values MUST be unique. The value can be a positive integer, a
negative integer, or a string. negative integer, or a string.
* CBOR Type: This contains the CBOR type of the item, or a pointer o CBOR Type: This contains the CBOR type of the item, or a pointer
to the registry that defines its type, when that depends on to the registry that defines its type, when that depends on
another item. another item.
* Reference: This contains a pointer to the public specification for o Reference: This contains a pointer to the public specification for
the item. the item.
This Registry has been initially populated by the values in This Registry has been initially populated by the values in
Section 6. The Reference column for all of these entries refers to Section 6. The Reference column for all of these entries refers to
sections of this document. sections of this document.
8.5. ACE Groupcomm Key Registry 8.6. ACE Groupcomm Key Registry
This specification establishes the "ACE Groupcomm Key" IANA Registry. This specification establishes the "ACE Groupcomm Key" IANA Registry.
The Registry has been created to use the "Expert Review Required" The Registry has been created to use the "Expert Review Required"
registration procedure [RFC8126]. Expert review guidelines are registration procedure [RFC8126]. Expert review guidelines are
provided in Section 8.10. provided in Section 8.11.
The columns of this Registry are: The columns of this Registry are:
* Name: This is a descriptive name that enables easier reference to o Name: This is a descriptive name that enables easier reference to
the item. The name MUST be unique. It is not used in the the item. The name MUST be unique. It is not used in the
encoding. encoding.
* Key Type Value: This is the value used to identify the keying o Key Type Value: This is the value used to identify the keying
material. These values MUST be unique. The value can be a material. These values MUST be unique. The value can be a
positive integer, a negative integer, or a text string. positive integer, a negative integer, or a text string.
* Profile: This field may contain one or more descriptive strings of o Profile: This field may contain one or more descriptive strings of
application profiles to be used with this item. The values should application profiles to be used with this item. The values should
be taken from the Name column of the "ACE Groupcomm Profile" be taken from the Name column of the "ACE Groupcomm Profile"
Registry. Registry.
* Description: This field contains a brief description of the keying o Description: This field contains a brief description of the keying
material. material.
* References: This contains a pointer to the public specification o References: This contains a pointer to the public specification
for the format of the keying material, if one exists. for the format of the keying material, if one exists.
This Registry has been initially populated by the values in Figure 5. This Registry has been initially populated by the values in Figure 5.
The specification column for all of these entries will be this The specification column for all of these entries will be this
document. document.
8.6. ACE Groupcomm Profile Registry 8.7. ACE Groupcomm Profile Registry
This specification establishes the "ACE Groupcomm Profile" IANA This specification establishes the "ACE Groupcomm Profile" IANA
Registry. The Registry has been created to use the "Expert Review Registry. The Registry has been created to use the "Expert Review
Required" registration procedure [RFC8126]. Expert review guidelines Required" registration procedure [RFC8126]. Expert review guidelines
are provided in Section 8.10. It should be noted that, in addition are provided in Section 8.11. It should be noted that, in addition
to the expert review, some portions of the Registry require a to the expert review, some portions of the Registry require a
specification, potentially a Standards Track RFC, be supplied as specification, potentially a Standards Track RFC, be supplied as
well. well.
The columns of this Registry are: The columns of this Registry are:
* Name: The name of the application profile, to be used as value of o Name: The name of the application profile, to be used as value of
the profile attribute. the profile attribute.
* Description: Text giving an overview of the application profile o Description: Text giving an overview of the application profile
and the context it is developed for. and the context it is developed for.
* CBOR Value: CBOR abbreviation for the name of this application o CBOR Value: CBOR abbreviation for the name of this application
profile. Different ranges of values use different registration profile. Different ranges of values use different registration
policies [RFC8126]. Integer values from -256 to 255 are policies [RFC8126]. Integer values from -256 to 255 are
designated as Standards Action. Integer values from -65536 to designated as Standards Action. Integer values from -65536 to
-257 and from 256 to 65535 are designated as Specification -257 and from 256 to 65535 are designated as Specification
Required. Integer values greater than 65535 are designated as Required. Integer values greater than 65535 are designated as
Expert Review. Integer values less than -65536 are marked as Expert Review. Integer values less than -65536 are marked as
Private Use. Private Use.
* Reference: This contains a pointer to the public specification of o Reference: This contains a pointer to the public specification of
the abbreviation for this application profile, if one exists. the abbreviation for this application profile, if one exists.
8.7. ACE Groupcomm Policy Registry 8.8. ACE Groupcomm Policy Registry
This specification establishes the "ACE Groupcomm Policy" IANA This specification establishes the "ACE Groupcomm Policy" IANA
Registry. The Registry has been created to use the "Expert Review Registry. The Registry has been created to use the "Expert Review
Required" registration procedure [RFC8126]. Expert review guidelines Required" registration procedure [RFC8126]. Expert review guidelines
are provided in Section 8.10. It should be noted that, in addition are provided in Section 8.11. It should be noted that, in addition
to the expert review, some portions of the Registry require a to the expert review, some portions of the Registry require a
specification, potentially a Standards Track RFC, be supplied as specification, potentially a Standards Track RFC, be supplied as
well. well.
The columns of this Registry are: The columns of this Registry are:
* Name: The name of the group communication policy. o Name: The name of the group communication policy.
* CBOR label: The value to be used to identify this group o CBOR label: The value to be used to identify this group
communication policy. Key map labels MUST be unique. The label communication policy. Key map labels MUST be unique. The label
can be a positive integer, a negative integer or a string. can be a positive integer, a negative integer or a string.
Integer values between 0 and 255 and strings of length 1 are Integer values between 0 and 255 and strings of length 1 are
designated as Standards Track Document required. Integer values designated as Standards Track Document required. Integer values
from 256 to 65535 and strings of length 2 are designated as from 256 to 65535 and strings of length 2 are designated as
Specification Required. Integer values of greater than 65535 and Specification Required. Integer values of greater than 65535 and
strings of length greater than 2 are designated as expert review. strings of length greater than 2 are designated as expert review.
Integer values less than -65536 are marked as private use. Integer values less than -65536 are marked as private use.
* CBOR type: the CBOR type used to encode the value of this group o CBOR type: the CBOR type used to encode the value of this group
communication policy. communication policy.
* Description: This field contains a brief description for this o Description: This field contains a brief description for this
group communication policy. group communication policy.
* Reference: This field contains a pointer to the public o Reference: This field contains a pointer to the public
specification providing the format of the group communication specification providing the format of the group communication
policy, if one exists. policy, if one exists.
This registry will be initially populated by the values in Figure 6. This registry will be initially populated by the values in Figure 6.
8.8. Sequence Number Synchronization Method Registry 8.9. Sequence Number Synchronization Method Registry
This specification establishes the "Sequence Number Synchronization This specification establishes the "Sequence Number Synchronization
Method" IANA Registry. The Registry has been created to use the Method" IANA Registry. The Registry has been created to use the
"Expert Review Required" registration procedure [RFC8126]. Expert "Expert Review Required" registration procedure [RFC8126]. Expert
review guidelines are provided in Section 8.10. It should be noted review guidelines are provided in Section 8.11. It should be noted
that, in addition to the expert review, some portions of the Registry that, in addition to the expert review, some portions of the Registry
require a specification, potentially a Standards Track RFC, be require a specification, potentially a Standards Track RFC, be
supplied as well. supplied as well.
The columns of this Registry are: The columns of this Registry are:
* Name: The name of the sequence number synchronization method. o Name: The name of the sequence number synchronization method.
* Value: The value to be used to identify this sequence number o Value: The value to be used to identify this sequence number
synchronization method. synchronization method.
* Description: This field contains a brief description for this o Description: This field contains a brief description for this
sequence number synchronization method. sequence number synchronization method.
* Reference: This field contains a pointer to the public o Reference: This field contains a pointer to the public
specification describing the sequence number synchronization specification describing the sequence number synchronization
method. method.
8.9. Interface Description (if=) Link Target Attribute Values Registry 8.10. Interface Description (if=) Link Target Attribute Values Registry
This specification registers the following entry to the "Interface This specification registers the following entry to the "Interface
Description (if=) Link Target Attribute Values Registry" registry, Description (if=) Link Target Attribute Values Registry" registry,
within the "CoRE Parameters" registry: within the "CoRE Parameters" registry:
* Attribute Value: ace-group o Attribute Value: ace-group
* Description: The 'ace group' interface is used to provision keying o Description: The 'ace group' interface is used to provision keying
material and related informations and policies to members of a material and related informations and policies to members of a
group using the Ace framework. group using the Ace framework.
* Reference: [This Document] o Reference: [This Document]
8.10. Expert Review Instructions 8.11. Expert Review Instructions
The IANA Registries established in this document are defined as The IANA Registries established in this document are defined as
expert review. This section gives some general guidelines for what expert review. This section gives some general guidelines for what
the experts should be looking for, but they are being designated as the experts should be looking for, but they are being designated as
experts for a reason so they should be given substantial latitude. experts for a reason so they should be given substantial latitude.
Expert reviewers should take into consideration the following points: Expert reviewers should take into consideration the following points:
* Point squatting should be discouraged. Reviewers are encouraged o Point squatting should be discouraged. Reviewers are encouraged
to get sufficient information for registration requests to ensure to get sufficient information for registration requests to ensure
that the usage is not going to duplicate one that is already that the usage is not going to duplicate one that is already
registered and that the point is likely to be used in deployments. registered and that the point is likely to be used in deployments.
The zones tagged as private use are intended for testing purposes The zones tagged as private use are intended for testing purposes
and closed environments, code points in other ranges should not be and closed environments, code points in other ranges should not be
assigned for testing. assigned for testing.
* Specifications are required for the standards track range of point o Specifications are required for the standards track range of point
assignment. Specifications should exist for specification assignment. Specifications should exist for specification
required ranges, but early assignment before a specification is required ranges, but early assignment before a specification is
available is considered to be permissible. Specifications are available is considered to be permissible. Specifications are
needed for the first-come, first-serve range if they are expected needed for the first-come, first-serve range if they are expected
to be used outside of closed environments in an interoperable way. to be used outside of closed environments in an interoperable way.
When specifications are not provided, the description provided When specifications are not provided, the description provided
needs to have sufficient information to identify what the point is needs to have sufficient information to identify what the point is
being used for. being used for.
* Experts should take into account the expected usage of fields when o Experts should take into account the expected usage of fields when
approving point assignment. The fact that there is a range for approving point assignment. The fact that there is a range for
standards track documents does not mean that a standards track standards track documents does not mean that a standards track
document cannot have points assigned outside of that range. The document cannot have points assigned outside of that range. The
length of the encoded value should be weighed against how many length of the encoded value should be weighed against how many
code points of that length are left, the size of device it will be code points of that length are left, the size of device it will be
used on, and the number of code points left that encode to that used on, and the number of code points left that encode to that
size. size.
9. References 9. References
9.1. Normative References 9.1. Normative References
[I-D.ietf-ace-cwt-proof-of-possession] [COSE.Algorithms]
Jones, M., Seitz, L., Selander, G., Erdtman, S., and H. IANA, "COSE Algorithms",
Tschofenig, "Proof-of-Possession Key Semantics for CBOR <https://www.iana.org/assignments/cose/
Web Tokens (CWTs)", Work in Progress, Internet-Draft, cose.xhtml#algorithms>.
draft-ietf-ace-cwt-proof-of-possession-11, 31 October
2019, <http://www.ietf.org/internet-drafts/draft-ietf-ace- [COSE.Key.Types]
cwt-proof-of-possession-11.txt>. IANA, "COSE Key Types",
<https://www.iana.org/assignments/cose/
cose.xhtml#key-type>.
[I-D.ietf-ace-oauth-authz] [I-D.ietf-ace-oauth-authz]
Seitz, L., Selander, G., Wahlstroem, E., Erdtman, S., and Seitz, L., Selander, G., Wahlstroem, E., Erdtman, S., and
H. Tschofenig, "Authentication and Authorization for H. Tschofenig, "Authentication and Authorization for
Constrained Environments (ACE) using the OAuth 2.0 Constrained Environments (ACE) using the OAuth 2.0
Framework (ACE-OAuth)", Work in Progress, Internet-Draft, Framework (ACE-OAuth)", draft-ietf-ace-oauth-authz-33
draft-ietf-ace-oauth-authz-33, 6 February 2020, (work in progress), February 2020.
<http://www.ietf.org/internet-drafts/draft-ietf-ace-oauth-
authz-33.txt>.
[I-D.ietf-ace-oauth-params] [I-D.ietf-ace-oauth-params]
Seitz, L., "Additional OAuth Parameters for Authorization Seitz, L., "Additional OAuth Parameters for Authorization
in Constrained Environments (ACE)", Work in Progress, in Constrained Environments (ACE)", draft-ietf-ace-oauth-
Internet-Draft, draft-ietf-ace-oauth-params-13, 28 April params-13 (work in progress), April 2020.
2020, <http://www.ietf.org/internet-drafts/draft-ietf-ace-
oauth-params-13.txt>.
[I-D.ietf-core-oscore-groupcomm] [I-D.ietf-core-oscore-groupcomm]
Tiloca, M., Selander, G., Palombini, F., and J. Park, Tiloca, M., Selander, G., Palombini, F., and J. Park,
"Group OSCORE - Secure Group Communication for CoAP", Work "Group OSCORE - Secure Group Communication for CoAP",
in Progress, Internet-Draft, draft-ietf-core-oscore- draft-ietf-core-oscore-groupcomm-08 (work in progress),
groupcomm-08, 6 April 2020, <http://www.ietf.org/internet- April 2020.
drafts/draft-ietf-core-oscore-groupcomm-08.txt>.
[I-D.ietf-cose-rfc8152bis-algs]
Schaad, J., "CBOR Object Signing and Encryption (COSE):
Initial Algorithms", draft-ietf-cose-rfc8152bis-algs-09
(work in progress), June 2020.
[I-D.ietf-cose-rfc8152bis-struct]
Schaad, J., "CBOR Object Signing and Encryption (COSE):
Structures and Process", draft-ietf-cose-rfc8152bis-
struct-10 (work in progress), June 2020.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997, DOI 10.17487/RFC2119, March 1997,
<https://www.rfc-editor.org/info/rfc2119>. <https://www.rfc-editor.org/info/rfc2119>.
[RFC6749] Hardt, D., Ed., "The OAuth 2.0 Authorization Framework",
RFC 6749, DOI 10.17487/RFC6749, October 2012,
<https://www.rfc-editor.org/info/rfc6749>.
[RFC6838] Freed, N., Klensin, J., and T. Hansen, "Media Type [RFC6838] Freed, N., Klensin, J., and T. Hansen, "Media Type
Specifications and Registration Procedures", BCP 13, Specifications and Registration Procedures", BCP 13,
RFC 6838, DOI 10.17487/RFC6838, January 2013, RFC 6838, DOI 10.17487/RFC6838, January 2013,
<https://www.rfc-editor.org/info/rfc6838>. <https://www.rfc-editor.org/info/rfc6838>.
[RFC7049] Bormann, C. and P. Hoffman, "Concise Binary Object [RFC7049] Bormann, C. and P. Hoffman, "Concise Binary Object
Representation (CBOR)", RFC 7049, DOI 10.17487/RFC7049, Representation (CBOR)", RFC 7049, DOI 10.17487/RFC7049,
October 2013, <https://www.rfc-editor.org/info/rfc7049>. October 2013, <https://www.rfc-editor.org/info/rfc7049>.
[RFC7252] Shelby, Z., Hartke, K., and C. Bormann, "The Constrained
Application Protocol (CoAP)", RFC 7252,
DOI 10.17487/RFC7252, June 2014,
<https://www.rfc-editor.org/info/rfc7252>.
[RFC8126] Cotton, M., Leiba, B., and T. Narten, "Guidelines for [RFC8126] Cotton, M., Leiba, B., and T. Narten, "Guidelines for
Writing an IANA Considerations Section in RFCs", BCP 26, Writing an IANA Considerations Section in RFCs", BCP 26,
RFC 8126, DOI 10.17487/RFC8126, June 2017, RFC 8126, DOI 10.17487/RFC8126, June 2017,
<https://www.rfc-editor.org/info/rfc8126>. <https://www.rfc-editor.org/info/rfc8126>.
[RFC8152] Schaad, J., "CBOR Object Signing and Encryption (COSE)",
RFC 8152, DOI 10.17487/RFC8152, July 2017,
<https://www.rfc-editor.org/info/rfc8152>.
[RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC [RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
May 2017, <https://www.rfc-editor.org/info/rfc8174>. May 2017, <https://www.rfc-editor.org/info/rfc8174>.
[RFC8747] Jones, M., Seitz, L., Selander, G., Erdtman, S., and H.
Tschofenig, "Proof-of-Possession Key Semantics for CBOR
Web Tokens (CWTs)", RFC 8747, DOI 10.17487/RFC8747, March
2020, <https://www.rfc-editor.org/info/rfc8747>.
9.2. Informative References 9.2. Informative References
[I-D.dijk-core-groupcomm-bis] [I-D.bormann-core-ace-aif]
Dijk, E., Wang, C., and M. Tiloca, "Group Communication Bormann, C., "An Authorization Information Format (AIF)
for the Constrained Application Protocol (CoAP)", Work in for ACE", draft-bormann-core-ace-aif-07 (work in
Progress, Internet-Draft, draft-dijk-core-groupcomm-bis- progress), February 2020.
03, 9 March 2020, <http://www.ietf.org/internet-drafts/
draft-dijk-core-groupcomm-bis-03.txt>.
[I-D.ietf-ace-dtls-authorize] [I-D.ietf-ace-dtls-authorize]
Gerdes, S., Bergmann, O., Bormann, C., Selander, G., and Gerdes, S., Bergmann, O., Bormann, C., Selander, G., and
L. Seitz, "Datagram Transport Layer Security (DTLS) L. Seitz, "Datagram Transport Layer Security (DTLS)
Profile for Authentication and Authorization for Profile for Authentication and Authorization for
Constrained Environments (ACE)", Work in Progress, Constrained Environments (ACE)", draft-ietf-ace-dtls-
Internet-Draft, draft-ietf-ace-dtls-authorize-09, 18 authorize-10 (work in progress), May 2020.
December 2019, <http://www.ietf.org/internet-drafts/draft-
ietf-ace-dtls-authorize-09.txt>.
[I-D.ietf-ace-mqtt-tls-profile] [I-D.ietf-ace-mqtt-tls-profile]
Sengul, C., Kirby, A., and P. Fremantle, "MQTT-TLS profile Sengul, C., Kirby, A., and P. Fremantle, "MQTT-TLS profile
of ACE", Work in Progress, Internet-Draft, draft-ietf-ace- of ACE", draft-ietf-ace-mqtt-tls-profile-05 (work in
mqtt-tls-profile-04, 9 March 2020, <http://www.ietf.org/ progress), May 2020.
internet-drafts/draft-ietf-ace-mqtt-tls-profile-04.txt>.
[I-D.ietf-ace-oscore-profile] [I-D.ietf-ace-oscore-profile]
Palombini, F., Seitz, L., Selander, G., and M. Gunnarsson, Palombini, F., Seitz, L., Selander, G., and M. Gunnarsson,
"OSCORE profile of the Authentication and Authorization "OSCORE profile of the Authentication and Authorization
for Constrained Environments Framework", Work in Progress, for Constrained Environments Framework", draft-ietf-ace-
Internet-Draft, draft-ietf-ace-oscore-profile-10, 9 March oscore-profile-10 (work in progress), March 2020.
2020, <http://www.ietf.org/internet-drafts/draft-ietf-ace-
oscore-profile-10.txt>.
[I-D.ietf-core-coap-pubsub] [I-D.ietf-core-coap-pubsub]
Koster, M., Keranen, A., and J. Jimenez, "Publish- Koster, M., Keranen, A., and J. Jimenez, "Publish-
Subscribe Broker for the Constrained Application Protocol Subscribe Broker for the Constrained Application Protocol
(CoAP)", Work in Progress, Internet-Draft, draft-ietf- (CoAP)", draft-ietf-core-coap-pubsub-09 (work in
core-coap-pubsub-09, 30 September 2019, progress), September 2019.
<http://www.ietf.org/internet-drafts/draft-ietf-core-coap-
pubsub-09.txt>. [I-D.ietf-core-groupcomm-bis]
Dijk, E., Wang, C., and M. Tiloca, "Group Communication
for the Constrained Application Protocol (CoAP)", draft-
ietf-core-groupcomm-bis-00 (work in progress), March 2020.
[RFC2093] Harney, H. and C. Muckenhirn, "Group Key Management [RFC2093] Harney, H. and C. Muckenhirn, "Group Key Management
Protocol (GKMP) Specification", RFC 2093, Protocol (GKMP) Specification", RFC 2093,
DOI 10.17487/RFC2093, July 1997, DOI 10.17487/RFC2093, July 1997,
<https://www.rfc-editor.org/info/rfc2093>. <https://www.rfc-editor.org/info/rfc2093>.
[RFC2094] Harney, H. and C. Muckenhirn, "Group Key Management [RFC2094] Harney, H. and C. Muckenhirn, "Group Key Management
Protocol (GKMP) Architecture", RFC 2094, Protocol (GKMP) Architecture", RFC 2094,
DOI 10.17487/RFC2094, July 1997, DOI 10.17487/RFC2094, July 1997,
<https://www.rfc-editor.org/info/rfc2094>. <https://www.rfc-editor.org/info/rfc2094>.
skipping to change at page 51, line 5 skipping to change at page 50, line 28
<https://www.rfc-editor.org/info/rfc2627>. <https://www.rfc-editor.org/info/rfc2627>.
[RFC6347] Rescorla, E. and N. Modadugu, "Datagram Transport Layer [RFC6347] Rescorla, E. and N. Modadugu, "Datagram Transport Layer
Security Version 1.2", RFC 6347, DOI 10.17487/RFC6347, Security Version 1.2", RFC 6347, DOI 10.17487/RFC6347,
January 2012, <https://www.rfc-editor.org/info/rfc6347>. January 2012, <https://www.rfc-editor.org/info/rfc6347>.
[RFC7519] Jones, M., Bradley, J., and N. Sakimura, "JSON Web Token [RFC7519] Jones, M., Bradley, J., and N. Sakimura, "JSON Web Token
(JWT)", RFC 7519, DOI 10.17487/RFC7519, May 2015, (JWT)", RFC 7519, DOI 10.17487/RFC7519, May 2015,
<https://www.rfc-editor.org/info/rfc7519>. <https://www.rfc-editor.org/info/rfc7519>.
[RFC7641] Hartke, K., "Observing Resources in the Constrained
Application Protocol (CoAP)", RFC 7641,
DOI 10.17487/RFC7641, September 2015,
<https://www.rfc-editor.org/info/rfc7641>.
[RFC7959] Bormann, C. and Z. Shelby, Ed., "Block-Wise Transfers in [RFC7959] Bormann, C. and Z. Shelby, Ed., "Block-Wise Transfers in
the Constrained Application Protocol (CoAP)", RFC 7959, the Constrained Application Protocol (CoAP)", RFC 7959,
DOI 10.17487/RFC7959, August 2016, DOI 10.17487/RFC7959, August 2016,
<https://www.rfc-editor.org/info/rfc7959>. <https://www.rfc-editor.org/info/rfc7959>.
[RFC8259] Bray, T., Ed., "The JavaScript Object Notation (JSON) Data [RFC8259] Bray, T., Ed., "The JavaScript Object Notation (JSON) Data
Interchange Format", STD 90, RFC 8259, Interchange Format", STD 90, RFC 8259,
DOI 10.17487/RFC8259, December 2017, DOI 10.17487/RFC8259, December 2017,
<https://www.rfc-editor.org/info/rfc8259>. <https://www.rfc-editor.org/info/rfc8259>.
[RFC8392] Jones, M., Wahlstroem, E., Erdtman, S., and H. Tschofenig, [RFC8392] Jones, M., Wahlstroem, E., Erdtman, S., and H. Tschofenig,
"CBOR Web Token (CWT)", RFC 8392, DOI 10.17487/RFC8392, "CBOR Web Token (CWT)", RFC 8392, DOI 10.17487/RFC8392,
May 2018, <https://www.rfc-editor.org/info/rfc8392>. May 2018, <https://www.rfc-editor.org/info/rfc8392>.
[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/info/rfc8610>.
[RFC8613] Selander, G., Mattsson, J., Palombini, F., and L. Seitz, [RFC8613] Selander, G., Mattsson, J., Palombini, F., and L. Seitz,
"Object Security for Constrained RESTful Environments "Object Security for Constrained RESTful Environments
(OSCORE)", RFC 8613, DOI 10.17487/RFC8613, July 2019, (OSCORE)", RFC 8613, DOI 10.17487/RFC8613, July 2019,
<https://www.rfc-editor.org/info/rfc8613>. <https://www.rfc-editor.org/info/rfc8613>.
[RFC8747] Jones, M., Seitz, L., Selander, G., Erdtman, S., and H. 9.3. URIs
Tschofenig, "Proof-of-Possession Key Semantics for CBOR
Web Tokens (CWTs)", RFC 8747, DOI 10.17487/RFC8747, March [1] mailto:iesg@ietf.org
2020, <https://www.rfc-editor.org/info/rfc8747>.
[2] mailto:francesca.palombini@ericsson.com
Appendix A. Requirements on Application Profiles Appendix A. Requirements on Application Profiles
This section lists the requirements on application profiles of this This section lists the requirements on application profiles of this
specification,for the convenience of application profile designers. specification,for the convenience of application profile designers.
* REQ1: Specify the encoding and value of the identifier of group or o REQ1: Specify the encoding and value of the identifier of group or
topic, for scope entries of 'scope' (see Section 3.1). topic, for scope entries of 'scope' (see Section 3.1).
* REQ2: Specify the encoding and value of roles, for scope entries o REQ2: Specify the encoding and value of roles, for scope entries
of 'scope' (see Section 3.1). of 'scope' (see Section 3.1).
* REQ3: If used, specify the acceptable values for 'sign_alg' (see o REQ3: If used, specify the acceptable values for 'sign_alg' (see
Section 3.3). Section 3.3).
* REQ4: If used, specify the acceptable values for 'sign_parameters' o REQ4: If used, specify the acceptable values for 'sign_parameters'
(see Section 3.3). (see Section 3.3).
* REQ5: If used, specify the acceptable values for o REQ5: If used, specify the acceptable values for
'sign_key_parameters' (see Section 3.3). 'sign_key_parameters' (see Section 3.3).
* REQ6: If used, specify the acceptable values for 'pub_key_enc' o REQ6: If used, specify the acceptable values for 'pub_key_enc'
(see Section 3.3). (see Section 3.3).
* REQ7: Specify the exact format of the 'key' value (see o REQ7: Specify the exact format of the 'key' value (see
Section 4.1.2.1). Section 4.1.2.1).
* REQ8: Specify the acceptable values of 'gkty' (see o REQ8: Specify the acceptable values of 'gkty' (see
Section 4.1.2.1). Section 4.1.2.1).
* REQ9: Specify the format of the identifiers of group members (see o REQ9: Specify the format of the identifiers of group members (see
Section 4.1.2.1). Section 4.1.2.1).
* REQ10: Specify the communication protocol the members of the group o REQ10: Specify the communication protocol the members of the group
must use (e.g., multicast CoAP). must use (e.g., multicast CoAP).
* REQ11: Specify the security protocol the group members must use to o REQ11: Specify the security protocol the group members must use to
protect their communication (e.g., group OSCORE). This must protect their communication (e.g., group OSCORE). This must
provide encryption, integrity and replay protection. provide encryption, integrity and replay protection.
* REQ12: Specify and register the application profile identifier o REQ12: Specify and register the application profile identifier
(see Section 4.1.2.1). (see Section 4.1.2.1).
* REQ13: Specify policies at the KDC to handle ids that are not o REQ13: Specify policies at the KDC to handle ids that are not
included in get_pub_keys (see Section 4.1.3.1). included in get_pub_keys (see Section 4.1.3.1).
* REQ14: If used, specify the format and content of 'group_policies' o REQ14: If used, specify the format and content of 'group_policies'
and its entries (see Section 4.1.2.1). and its entries (see Section 4.1.2.1).
* REQ15: Specify the format of newly-generated individual keying o REQ15: Specify the format of newly-generated individual keying
material for group members, or of the information to derive it, material for group members, or of the information to derive it,
and corresponding CBOR label (see Section 4.1.6.2). and corresponding CBOR label (see Section 4.1.6.2).
* REQ16: Specify how the communication is secured between Client and o REQ16: Specify how the communication is secured between Client and
KDC. Optionally, specify tranport profile of ACE KDC. Optionally, specify tranport profile of ACE
[I-D.ietf-ace-oauth-authz] to use between Client and KDC (see [I-D.ietf-ace-oauth-authz] to use between Client and KDC (see
Section 4.2. Section 4.2.
* REQ17: Specify how the nonce N_S is generated, if the token is not o REQ17: Specify how the nonce N_S is generated, if the token is not
being posted (e.g. if it is used directly to validate TLS being posted (e.g. if it is used directly to validate TLS
instead). instead).
* REQ18: Specify if 'mgt_key_material' used, and if yes specify its o REQ18: Specify if 'mgt_key_material' used, and if yes specify its
format and content (see Section 4.1.2.1). If the usage of format and content (see Section 4.1.2.1). If the usage of
'mgt_key_material' is indicated and its format defined for a 'mgt_key_material' is indicated and its format defined for a
specific key management scheme, that format must explicitly specific key management scheme, that format must explicitly
indicate the key management scheme itself. If a new rekeying indicate the key management scheme itself. If a new rekeying
scheme is defined to be used for an existing 'mgt_key_material' in scheme is defined to be used for an existing 'mgt_key_material' in
an existing profile, then that profile will have to be updated an existing profile, then that profile will have to be updated
accordingly, especially with respect to the usage of accordingly, especially with respect to the usage of
'mgt_key_material' related format and content. 'mgt_key_material' related format and content.
* OPT1: Optionally, specify the encoding of public keys, of o OPT1: Optionally, specify the encoding of public keys, of
'client_cred', and of 'pub_keys' if COSE_Keys are not used (see 'client_cred', and of 'pub_keys' if COSE_Keys are not used (see
Section 4.1.2.1). Section 4.1.2.1).
* OPT2: Optionally, specify the negotiation of parameter values for o OPT2: Optionally, specify the negotiation of parameter values for
signature algorithm and signature keys, if 'sign_info' and signature algorithm and signature keys, if 'sign_info' and
'pub_key_enc' are not used (see Section 3.3). 'pub_key_enc' are not used (see Section 3.3).
* OPT3: Optionally, specify the encoding of 'pub_keys_repos' if the o OPT3: Optionally, specify the encoding of 'pub_keys_repos' if the
default is not used (see Section 4.1.2.1). default is not used (see Section 4.1.2.1).
* OPT4: Optionally, specify policies that instruct clients to retain o OPT4: Optionally, specify policies that instruct clients to retain
messages and for how long, if they are unsuccessfully decrypted messages and for how long, if they are unsuccessfully decrypted
(see Section 4.3). This makes it possible to decrypt such (see Section 4.3). This makes it possible to decrypt such
messages after getting updated keying material. messages after getting updated keying material.
* OPT5: Optionally, specify the behavior of the handler in case of o OPT5: Optionally, specify the behavior of the handler in case of
failure to retrieve a public key for the specific node (see failure to retrieve a public key for the specific node (see
Section 4.1.2.1). Section 4.1.2.1).
* OPT6: Optionally, specify possible or required payload formats for o OPT6: Optionally, specify possible or required payload formats for
specific error cases. specific error cases.
* OPT7: Optionally, specify CBOR values to use for abbreviating o OPT7: Optionally, specify CBOR values to use for abbreviating
identifiers of roles in the group or topic (see Section 3.1). identifiers of roles in the group or topic (see Section 3.1).
* OPT8: Optionally, specify policies for the KDC to perform group o OPT8: Optionally, specify policies for the KDC to perform group
rekeying after receiving a Key Renewal Request (see Section 4.4). rekeying after receiving a Key Renewal Request (see Section 4.4).
* OPT9: Optionally, specify the functionalities implemented at the o OPT9: Optionally, specify the functionalities implemented at the
'control_path' resource hosted at the Client, including message 'control_path' resource hosted at the Client, including message
exchange encoding and other details (see Section 4.1.2.1). exchange encoding and other details (see Section 4.1.2.1).
* OPT10: Optionally, specify how the identifier of the sender's o OPT10: Optionally, specify how the identifier of the sender's
public key is included in the group request (see Section 4.6). public key is included in the group request (see Section 4.6).
Appendix B. Document Updates Appendix B. Document Updates
RFC EDITOR: PLEASE REMOVE THIS SECTION. RFC EDITOR: PLEASE REMOVE THIS SECTION.
B.1. Version -04 to -05 B.1. Version -04 to -05
* Updated uppercase/lowercase URI segments for KDC resources. o Updated uppercase/lowercase URI segments for KDC resources.
* Supporting single Access Token for multiple groups/topics. o Supporting single Access Token for multiple groups/topics.
* Added 'control_path' parameter in the Joining Request. o Added 'control_path' parameter in the Joining Request.
* Added 'peer_roles' parameter to support legal requesters/ o Added 'peer_roles' parameter to support legal requesters/
responders. responders.
* Clarification on stopping using owned keying material. o Clarification on stopping using owned keying material.
* Clarification on different reasons for processing failures, o Clarification on different reasons for processing failures,
related policies, and requirement OPT4. related policies, and requirement OPT4.
* Added a KDC sub-resource for group members to upload a new public o Added a KDC sub-resource for group members to upload a new public
key. key.
* Possible group rekeying following an individual Key Renewal o Possible group rekeying following an individual Key Renewal
Request. Request.
* Clarified meaning of requirement REQ3; added requirement OPT8. o Clarified meaning of requirement REQ3; added requirement OPT8.
* Editorial improvements. o Editorial improvements.
B.2. Version -03 to -04 B.2. Version -03 to -04
* Revised RESTful interface, as to methods and parameters. o Revised RESTful interface, as to methods and parameters.
* Extended processing of joining request, as to check/retrieval of o Extended processing of joining request, as to check/retrieval of
public keys. public keys.
* Revised and extended profile requirements. o Revised and extended profile requirements.
* Clarified specific usage of parameters related to signature o Clarified specific usage of parameters related to signature
algorithms/keys. algorithms/keys.
* Included general content previously in draft-ietf-ace-key- o Included general content previously in draft-ietf-ace-key-
groupcomm-oscore groupcomm-oscore
* Registration of media type and content format application/ace- o Registration of media type and content format application/ace-
group+cbor group+cbor
* Editorial improvements. o Editorial improvements.
B.3. Version -02 to -03 B.3. Version -02 to -03
* Exchange of information on the countersignature algorithm and o Exchange of information on the countersignature algorithm and
related parameters, during the Token POST (Section 3.3). related parameters, during the Token POST (Section 3.3).
* Restructured KDC interface, with new possible operations o Restructured KDC interface, with new possible operations
(Section 4). (Section 4).
* Client PoP signature for the Joining Request upon joining o Client PoP signature for the Joining Request upon joining
(Section 4.1.2.1). (Section 4.1.2.1).
* Revised text on group member removal (Section 5). o Revised text on group member removal (Section 5).
* Added more profile requirements (Appendix A). o Added more profile requirements (Appendix A).
B.4. Version -01 to -02 B.4. Version -01 to -02
* Editorial fixes. o Editorial fixes.
* Distinction between transport profile and application profile o Distinction between transport profile and application profile
(Section 1.1). (Section 1.1).
* New parameters 'sign_info' and 'pub_key_enc' to negotiate o New parameters 'sign_info' and 'pub_key_enc' to negotiate
parameter values for signature algorithm and signature keys parameter values for signature algorithm and signature keys
(Section 3.3). (Section 3.3).
* New parameter 'type' to distinguish different Key Distribution o New parameter 'type' to distinguish different Key Distribution
Request messages (Section 4.1). Request messages (Section 4.1).
* New parameter 'client_cred_verify' in the Key Distribution Request o New parameter 'client_cred_verify' in the Key Distribution Request
to convey a Client signature (Section 4.1). to convey a Client signature (Section 4.1).
* Encoding of 'pub_keys_repos' (Section 4.1). o Encoding of 'pub_keys_repos' (Section 4.1).
* Encoding of 'mgt_key_material' (Section 4.1). o Encoding of 'mgt_key_material' (Section 4.1).
* Improved description on retrieval of new or updated keying o Improved description on retrieval of new or updated keying
material (Section 6). material (Section 6).
* Encoding of 'get_pub_keys' in Public Key Request (Section 7.1). o Encoding of 'get_pub_keys' in Public Key Request (Section 7.1).
* Extended security considerations (Sections 10.1 and 10.2). o Extended security considerations (Sections 10.1 and 10.2).
* New "ACE Public Key Encoding" IANA Registry (Section 11.2). o New "ACE Public Key Encoding" IANA Registry (Section 11.2).
* New "ACE Groupcomm Parameters" IANA Registry (Section 11.3), o New "ACE Groupcomm Parameters" IANA Registry (Section 11.3),
populated with the entries in Section 8. populated with the entries in Section 8.
* New "Ace Groupcomm Request Type" IANA Registry (Section 11.4), o New "Ace Groupcomm Request Type" IANA Registry (Section 11.4),
populated with the values in Section 9. populated with the values in Section 9.
* New "ACE Groupcomm Policy" IANA Registry (Section 11.7) populated o New "ACE Groupcomm Policy" IANA Registry (Section 11.7) populated
with two entries "Sequence Number Synchronization Method" and "Key with two entries "Sequence Number Synchronization Method" and "Key
Update Check Interval" (Section 4.2). Update Check Interval" (Section 4.2).
* Improved list of requirements for application profiles o Improved list of requirements for application profiles
(Appendix A). (Appendix A).
B.5. Version -00 to -01 B.5. Version -00 to -01
* Changed name of 'req_aud' to 'audience' in the Authorization o Changed name of 'req_aud' to 'audience' in the Authorization
Request (Section 3.1). Request (Section 3.1).
* Defined error handling on the KDC (Sections 4.2 and 6.2). o Defined error handling on the KDC (Sections 4.2 and 6.2).
* Updated format of the Key Distribution Response as a whole o Updated format of the Key Distribution Response as a whole
(Section 4.2). (Section 4.2).
* Generalized format of 'pub_keys' in the Key Distribution Response o Generalized format of 'pub_keys' in the Key Distribution Response
(Section 4.2). (Section 4.2).
* Defined format for the message to request leaving the group o Defined format for the message to request leaving the group
(Section 5.2). (Section 5.2).
* Renewal of individual keying material and methods for group o Renewal of individual keying material and methods for group
rekeying initiated by the KDC (Section 6). rekeying initiated by the KDC (Section 6).
* CBOR type for node identifiers in 'get_pub_keys' (Section 7.1). o CBOR type for node identifiers in 'get_pub_keys' (Section 7.1).
* Added section on parameter identifiers and their CBOR keys o Added section on parameter identifiers and their CBOR keys
(Section 8). (Section 8).
* Added request types for requests to a Join Response (Section 9). o Added request types for requests to a Join Response (Section 9).
* Extended security considerations (Section 10). o Extended security considerations (Section 10).
* New IANA registries "ACE Groupcomm Key Registry", "ACE Groupcomm o New IANA registries "ACE Groupcomm Key Registry", "ACE Groupcomm
Profile Registry", "ACE Groupcomm Policy Registry" and "Sequence Profile Registry", "ACE Groupcomm Policy Registry" and "Sequence
Number Synchronization Method Registry" (Section 11). Number Synchronization Method Registry" (Section 11).
* Added appendix about requirements for application profiles of ACE o Added appendix about requirements for application profiles of ACE
on group communication (Appendix A). on group communication (Appendix A).
Acknowledgments Acknowledgments
The following individuals were helpful in shaping this document: The following individuals were helpful in shaping this document:
Carsten Bormann, Rikard Hoeglund, Ben Kaduk, John Mattsson, Daniel Carsten Bormann, Rikard Hoeglund, Ben Kaduk, John Mattsson, Daniel
Migault, Jim Schaad, Ludwig Seitz, Goeran Selander and Peter van der Migault, Jim Schaad, Ludwig Seitz, Goeran Selander and Peter van der
Stok. Stok.
The work on this document has been partly supported by VINNOVA and The work on this document has been partly supported by VINNOVA and
skipping to change at page 57, line 4 skipping to change at page 56, line 39
The following individuals were helpful in shaping this document: The following individuals were helpful in shaping this document:
Carsten Bormann, Rikard Hoeglund, Ben Kaduk, John Mattsson, Daniel Carsten Bormann, Rikard Hoeglund, Ben Kaduk, John Mattsson, Daniel
Migault, Jim Schaad, Ludwig Seitz, Goeran Selander and Peter van der Migault, Jim Schaad, Ludwig Seitz, Goeran Selander and Peter van der
Stok. Stok.
The work on this document has been partly supported by VINNOVA and The work on this document has been partly supported by VINNOVA and
the Celtic-Next project CRITISEC; and by the EIT-Digital High Impact the Celtic-Next project CRITISEC; and by the EIT-Digital High Impact
Initiative ACTIVE. Initiative ACTIVE.
Authors' Addresses Authors' Addresses
Francesca Palombini Francesca Palombini
Ericsson AB Ericsson AB
Torshamnsgatan 23 Torshamnsgatan 23
SE-16440 Stockholm Kista Kista SE-16440 Stockholm
Sweden Sweden
Email: francesca.palombini@ericsson.com Email: francesca.palombini@ericsson.com
Marco Tiloca Marco Tiloca
RISE AB RISE AB
Isafjordsgatan 22 Isafjordsgatan 22
SE-16440 Stockholm Kista Kista SE-16440 Stockholm
Sweden Sweden
Email: marco.tiloca@ri.se Email: marco.tiloca@ri.se
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