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Prerequisites

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Create the following directory tree and empty, two index.txt and serial files containing integer values.
Place files in their corresponding directories and modify them to match your organisation’s information. Your keystores and truststores will be output to a directory named keystores one level above your working directory.

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mkdir -p certs crl intermediate intermediate/certs intermediate/csr intermediate/newcerts intermediate/private private newcerts ../keystores;
touch index.txt intermediate/index.txt;
echo 1001 | tee serial intermediate/serial;

In each openssl.cnf modify dir to match their respective absolute paths (pwd will show your current working directory).

Root CA

First we want to create a private key and root CA

openssl genrsa -aes256 -out private/ca.key.pem 4096;
chmod 400 private/ca.key.pem;

openssl req -config ca-openssl.cnf \
    -key private/ca.key.pem \
	-new -x509 -days 7300 -sha256 -extensions v3_ca \
	-out certs/ca.cert.pem;
chmod 444 certs/ca.cert.pem;

Intermediate CA

We need to generate an intermediate CA

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cat intermediate/certs/intermediate.cert.pem \
      certs/ca.cert.pem > intermediate/certs/ca-chain.cert.pem;

chmod 444 intermediate/certs/ca-chain.cert.pem;

Sever Certificate

Next we will be creating a certificate and key for our server, sign it and generate the keystore to be used by HiveMQ. In the following examples, you will need to replace broker.hivemq.local with the FQDN of the individual nodes you are creating these for.

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keytool -import -trustcacerts -alias 'Root CA' -file certs/ca.cert.pem -keystore ../keystores/broker.hivemq.local-truststore.jks;

Client certificates

Now we can start creating certificates which our clients can present to the server while establishing a connection. You may replace client1 with any desired name.

As before, our starting point is to generate a key…

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