NAME

       mosquitto-tls - Configure SSL/TLS support for Mosquitto

DESCRIPTION

       mosquitto provides SSL support for encrypted network connections and authentication. This
       manual describes how to create the files needed.

           Note
           It is important to use different certificate subject parameters for your CA, server
           and clients. If the certificates appear identical, even though generated separately,
           the broker/client will not be able to distinguish between them and you will experience
           difficult to diagnose errors.

GENERATING CERTIFICATES

       The sections below give the openssl commands that can be used to generate certificates,
       but without any context. The asciicast at https://asciinema.org/a/201826 gives a full run
       through of how to use those commands.

CERTIFICATE AUTHORITY

       Generate a certificate authority certificate and key.

       •   openssl req -new -x509 -days <duration> -extensions v3_ca -keyout ca.key -out ca.crt

SERVER

       Generate a server key.

       •   openssl genrsa -aes256 -out server.key 2048

       Generate a server key without encryption.

       •   openssl genrsa -out server.key 2048

       Generate a certificate signing request to send to the CA.

       •   openssl req -out server.csr -key server.key -new

           Note
           When prompted for the CN (Common Name), please enter either your server (or broker)
           hostname or domain name.

       Send the CSR to the CA, or sign it with your CA key:

       •   openssl x509 -req -in server.csr -CA ca.crt -CAkey ca.key -CAcreateserial -out
           server.crt -days <duration>

CLIENT

       Generate a client key.

       •   openssl genrsa -aes256 -out client.key 2048

       Generate a certificate signing request to send to the CA.

       •   openssl req -out client.csr -key client.key -new

       Send the CSR to the CA, or sign it with your CA key:

       •   openssl x509 -req -in client.csr -CA ca.crt -CAkey ca.key -CAcreateserial -out
           client.crt -days <duration>

SEE ALSO

       mosquitto(8), mosquitto-conf(5)

AUTHOR

       Roger Light <roger@atchoo.org>