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cdupont avatar cdupont commented on September 2, 2024

A caching mechanism could be an option. For example, HiveMQ has a plugin for ACL:
https://www.hivemq.com/blog/mqtt-security-fundamentals-authorization/
It has a caching mechanisms, that updates the permissions every 5 minutes.
However, this does not solve the scenario where we connect, create a resource and push immediately.
@j-forster what do you think?

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j-forster avatar j-forster commented on September 2, 2024

I can't think of an easy solution right now. The most effective one would be to give the permission right when the device is added. But we can not implement this with mosquitto right now...
On the Gateway, the requests from Publish and Post are merged internally to the same routing engine and can be checked for auth at the same place - so this problem does not exist on Gateway level.

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cdupont avatar cdupont commented on September 2, 2024

706447d
I added a timer that fetches the permissions every minute.
So, after any permission change, the user will have to wait maximum 1 minute in order to use MQTT
I think its a reasonable workaround
Or do a MQTT reconnect

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