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MQTT over WebSockets with TLS [message #1848396]

Wed, 01 December 2021 07:35

rishabh sharma

Messages: 4
Registered: December 2021

Junior Member

We are using the mosquitto.conf (attached in the post)
Have generated ca.crt, server.crt and server.key using openssl,
and am able to establish secure mqtt communication, when only protocol mqtt is specified in the mosquitto.conf,
Our requirement is to achieve TLS based Secure MQTT Communication over WebSockets, please suggest if the mosquitto conf which is attached is the correct one, for the use case, and then if there are any javascript client libraries which we can use to connect to the broker, so far have tried the PAHO client with which we are not able to connect.
Tried MQTT Explorer that connects in case of Encrypted mode but only when there is no additional certificate specified, in which case the doubt is how is TLS possible without a certificate.

Attachment: mosquitto.conf
(Size: 39.74KB, Downloaded 128 times)

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Re: MQTT over WebSockets with TLS [message #1848418 is a reply to message #1848396]

Wed, 01 December 2021 15:19

Roger Light

Messages: 90
Registered: September 2013

Member

I would suggest using this modified version of your configuration. Please note that if your certificate hostname does not match the hostname you are connecting to then many clients may refuse to connect. MQTT Explorer has the option of disabling certificate checking which allows you to figure out when there is a problem. Disabling certificate checks is not something you should be doing normally though.

# These options apply to both listeners
allow_anonymous false
password_file password.txt
 
# Define a listener for encrypted MQTT
listener 8883
protocol mqtt
certfile server.crt
keyfile server.key
cafile ca.crt
tls_version tlsv1.2
 
# Define a listener for encrypted MQTT over WebSockets
listener 8081
protocol websockets
certfile server.crt
keyfile server.key
cafile ca.crt
tls_version tlsv1.2

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Re: MQTT over WebSockets with TLS [message #1849939 is a reply to message #1848418]

Wed, 09 February 2022 06:52

rishabh sharma

Messages: 4
Registered: December 2021

Junior Member

I tried to create new set of certificate with the common name as the hostname of my system on which the broker is hosted, and updated the config as well, but in this configuration also I'm not able to establish websocket connection, whereas I'm able to connect when the protocol is mqtt in the mosquitto.conf, only in case of websockets is where I am facing the issue where my code throws an exception stating

AuthenticationException: The remote certificate is invalid according to the validation procedure.

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