The RabbitMQ configuration file, which by default is located at /etc/rabbitmq/rabbitmq.conf, will list the location of the Certificate Authority (CA) file, server certificate file, and private key file, like this.

ssl_options.cacertfile = /path/to/ca.pem
ssl_options.certfile   = /path/to/certificate.pem
ssl_options.keyfile    = /path/to/key.pem