[OASIS Issue Tracker] (MQTT-431) Review Re-authentication mechanism

Richard Coppen created MQTT-431:
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             Summary: Review Re-authentication mechanism
                 Key: MQTT-431
                 URL: https://issues.oasis-open.org/browse/MQTT-431
             Project: OASIS Message Queuing Telemetry Transport (MQTT) TC
          Issue Type: Bug
          Components: core
    Affects Versions: 5, wd13
            Reporter: Richard Coppen
             Fix For: 5


MQTT v5.0 introduces a new AUTH mechanism. This allows MQTT to bind with various authentication mechanisms such as SASL within the CONNECT / CONNACK exchange.

In its current form the Client is permitted to flow an Auth Packet for re-authenication at any point. There are a few potential issues with this approach:

1. Implementations might exploit the AUTH flow for application data and control.
2. Only the Client can initiate the re-authentication. In many cases the Server is likely to coordinate Clients to refresh keys.
3. It is likely that existing deployments simply use DISCONNECT to coordinate re-authentication and this might lead to little uptake on re-auth.

There are benefits to the current approach, for example in reducing bandwidth.



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