The Messaging Layer Security (MLS) Federation
draft-ietf-mls-federation-00
Network Working Group E. Omara
Internet-Draft Google
Intended status: Informational R. Robert
Expires: March 14, 2020 Wire
September 11, 2019
The Messaging Layer Security (MLS) Federation
draft-ietf-mls-federation-00
Abstract
This document describes how the Messaging Layer Security (MLS) can be
used in a federated environment where different MLS implementations
can interoperate by defining the message format for user key
retrieval. The document also describes some use cases where
federation could be useful.
Status of This Memo
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This Internet-Draft will expire on March 14, 2020.
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Internet-Draft MLS Federation September 2019
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Use cases . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3.1. Different Delivery Servers . . . . . . . . . . . . . . . 4
3.2. Different client applications . . . . . . . . . . . . . . 4
4. Functional Requirements . . . . . . . . . . . . . . . . . . . 4
4.1. Delivery service . . . . . . . . . . . . . . . . . . . . 4
4.1.1. Client fanout . . . . . . . . . . . . . . . . . . . . 5
4.1.2. Server fanout . . . . . . . . . . . . . . . . . . . . 5
4.2. Authentication service . . . . . . . . . . . . . . . . . 6
5. Message format . . . . . . . . . . . . . . . . . . . . . . . 6
6. Security Considerations . . . . . . . . . . . . . . . . . . . 7
6.1. Version negotiation . . . . . . . . . . . . . . . . . . . 7
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 7
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 8
8.1. Normative References . . . . . . . . . . . . . . . . . . 8
8.2. Informative References . . . . . . . . . . . . . . . . . 8
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 8
1. Introduction
MLS Architecture draft [MLSARCH] describes the overall MLS system
architecture assuming the client and servers (Delivery Service and
Authentication Service) are operated by the same entity. This
document describes the minimum changes needed to allow different MLS
clients operated by the same or different entities to communicate
with each and explaining The use cases where federation could be
useful.
The focus of this document will be the interaction between the client
and the Delivery Service, specifically how the client retrieves the
identityKey and InitKeys for another client. There is no changes
needed for the Authentication Service.
Discovering which Delivery service the client communicates with is
out of the scope of this document.
The below diagram shows an MLS group where all clients are operated
under the same deliver service:
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+------------+
+ Delivery +
+ Service (DS) +
+-----+------+
/ + \ Group
*********************************************************
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