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AUTOSOL does not provide this information for use as a source of security advice or best practices. The use of these examples is done at your own discretion and risk and with agreement that you will be solely responsible for any damage to your computer system or loss of data that results from such activities. |
Instructions for creating key pairs and certificates for use with AUTOSOL Edge products. Prerequisite:
How you create your certificate chain depends on your desired security posture. There are two options:
TLS with Server Certificate Authentication
TLS with Server and Client Certificate Authentication
Steps for Creating Certificates for Client Authentication
...
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openssl req -out client.csr -key client.key -new -subj "/C=US/ST=Texas/O=THIS_COMPANY INC/CN=MyEACM/emailAddress=johnsmith@gmailname@company.com" --outform PEM |
Create the client certificate (client.pem). The step must take place where you have your ca.key. The client.csr and ca.pem files are also required. If you used a password when creating your ca.key, you will be prompted for it.
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openssl x509 -req -in client.csr -CA ca.pem -CAkey ca.key -CAcreateserial -out client.pem -days 3650 --outform PEM |
Configuration
You now have all the files required to configure your client and server (broker) for TLS authentication with both server authentication and client authentication.
You will need to provide ca.pem to both your client and server.
You will need to provide server.key and server.pem to your server.
You will need to provide client.key and client.pem to each client. The client will also need to be provided with the password used to encrypt its client.key.
Client
In older versions of eACM, you must copy (scp) your ca.pem, client.key and client.pem to the host where eACM is installed and reference the path to it in your TLS Settings object (MQTT app) or the Broker 1/2 tab of your Node object (Edge Manager).
In newer versions of eACM, you can upload your ca.pem, client.key and client.pem using the TLS Settings object form or Node object form.
Assign ca.pem to the CA File property of the object.
Assign client.key to the Client Private Key property of the object.
Assign client.pem to the Client Certificate property of the object.
Assign the password used to encrypt client.key to Private Key Password.
Server (Broker)
The broker configuration will be different for each broker. Example for mosquitto:
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per_listener_settings true
listener 8883
allow_anonymous false
require_certificate true
certfile C:\Users\myuser\Documents\certs\server.pem
keyfile C:\Users\myuser\Documents\certs\server.key
cafile C:\Users\myuser\Documents\certs\ca.pem
use_identity_as_username true
acl_file C:\Users\myuser\Documents\mosquitto\acl_8883.txt |
Where acl_8883.txt may contain by example:
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user MyEACM
topic read STATE/+
topic readwrite spBv1.0/#
user SparkplugViewer
topic read STATE/+
topic read spBv1.0/#
user HMI
topic readwrite STATE/+
topic readwrite spBv1.0/# |