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Add operator mode authentication description

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In operator mode, MQTT clients need to provide the JWT through the MQTT password.
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Ivan Kozlovic 2021-05-26 10:13:28 -06:00 committed by GitHub
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nats-server/configuration/mqtt/mqtt_config.md
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@ -100,7 +100,15 @@ mqtt {
}
```
## Authorization of MQTT Users
## Authentication/Authorization of MQTT Users
### Operator mode
In operator mode, all users need to provide a JWT in order to connect. For MQTT clients, it means that you need to pass the JWT token as the MQTT password and use any username since MQTT protocol requires a username to be set if a password is set.
In this mode, standard NATS clients are required to sign a `nonce` sent by the server using their private key (see [JWTs and Privacy](../securing_nats/jwt#jwts-and-privacy)). Of course MQTT clients cannot do that, therefore, in order for the JWT to be accepted by the server without the need of signing the `nonce`, the JWT has to have the `Bearer` boolean set to true.
### Local mode
A new field when configuring users allows you to restrict which type of connections are allowed for a specific user.