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MOSQUITTO-TLS(7) Conventions and miscellaneous MOSQUITTO-TLS(7) NAME mosquitto-tls - Configure SSL/TLS support for Mosquitto DESCRIPTION mosquitto provides SSL support for encrypted network connections and au- thentication. 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 dis- tinguish between them and you will experience difficult to diagnose er- rors. GENERATING CERTIFICATES The sections below give the openssl commands that can be used to generate certificates, but without any context. The asciicast at https://asci- inema.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 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 -CAcreateser- ial -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 -CAcreateser- ial -out client.crt -days <duration> SEE ALSO mosquitto(7), mosquitto(8), mosquitto.conf(5) AUTHOR Roger Light <roger@atchoo.org> Mosquitto Project 07/30/2026 MOSQUITTO-TLS(7)
NAME | DESCRIPTION | GENERATING CERTIFICATES | CERTIFICATE AUTHORITY | SERVER | CLIENT | SEE ALSO | AUTHOR
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