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As a first step, we need to generate certificates for Chariot, MQTT Engine and MQTT Transmission. Let’s create the following directory tree to work with:
├── ca/
│ ├── engine/
│ ├── server/
│ └── transmission/
└── certs/
├── engine/
├── server/
└── transmission/
Here is a summary of what needs to be done here:
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Generate a private key file (ca.key) for the Root CA using the command below. You will be required to enter a pass phrase to be associated with the ca.key file
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openssl genrsa -des3 -out ca/ca.key 2048 |
Generate a self-signed certificate (ca.crt) for the Root CA using the command below. This command generates a new self-signed X.509 certificate named "ca.crt" valid for 3650 days (10 years) using the RSA private key "ca.key" and you ". A "ca.srl" file will also be created containing the signed certificate's unique serial number. You will be required to enter the pass phrase created in the previous stepassociated with the private key file "ca.key".
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openssl req -new -x509 -key ca/ca.key -days 3650 -out ca/ca.crt |
Note |
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There are a number of fields associated with the creation of the certificate. The required fields are: Country Name (2 letter code) []: State or Province Name (full name) []: Locality Name (eg, city) []: Organization Name (eg, company) []: Organizational Unit Name (eg, section) []: We set this to CA Common Name (eg, fully qualified host name) [] We set this to the FQDN of the Chariot server Email Address []: |
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Generate a private key file (serverCA.key) for the Server CA using the command below. You will be required to enter a pass phrase to be associated with the serverCA.key file.
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openssl genrsa -des3 -out ca/server/serverCA.key 2048 |
Generate a Certificate Signing Request (CSR) for the server CA using the command below. This command generates a new CSR named "serverCA.csr’ using the RSA private key "serverCA.key" and you will be required to enter the pass phrase created in the previous step.
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openssl req -new -key ca/server/serverCA.key -out ca/server/serverCA.csr |
Note |
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There are a number of fields associated with the creation of the certificate. The required fields are: Country Name (2 letter code) []: State or Province Name (full name) []: Locality Name (eg, city) []: Organization Name (eg, company) []: Organizational Unit Name (eg, section) []: We set this as Server CA Common Name (eg, fully qualified host name) []: We set this as the FQDN of the Chariot server Email Address []: Extra attributes to be sent with the certificate request are: A challenge password []: |
Sign the Server CA with the Root CA using the command below. This command will sign the CSR "serverCA.csr" with the Root CA certificate ‘ca.crt’ and RSA private key ‘ca.key’, creating a new X.509 certificate named ‘serverCA.crt’ valid for 3650 days (10 years). A "serverCA.srl" file will also be created containing the signed certificate's unique serial number. You will be required to enter the pass phrase associated with the private key file "ca.key".
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openssl x509 -req -in ca/server/serverCA.csr -CA ca/ca.crt -CAkey ca/ca.key -CAcreateserial -out ca/server/serverCA.crt -days 3650 |
Generate a private key file (engineCA.key) for MQTT Engine CA using the command below. You will be required to enter a pass phrase to be associated with the engineCA.key file.
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openssl genrsa -des3 -out ca/engine/engineCA.key 2048 |
Generate a Certificate Signing Request (CSR) for the MQTT Engine CA using the command below. This command generates a new CSR named "engineCA.csr’ using the RSA private key "engineCA.key" and you will be required to enter the pass phrase created in the previous step.
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openssl req -new -key ca/engine/engineCA.key -out ca/engine/engineCA.csr |
Note |
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There are a number of fields associated with the creation of the certificate. The required fields are: Country Name (2 letter code) []: State or Province Name (full name) []: Locality Name (eg, city) []: Organization Name (eg, company) []: Organizational Unit Name (eg, section) []: We set this as MQTT Engine CA Common Name (eg, fully qualified host name) []: We set this as the FQDN of the Chariot server Email Address []: Extra attributes to be sent with the certificate request are: A challenge password []: |
Sign the MQTT Engine CA with the Root CA using the command below. This command will sign the CSR "engineCA.csr" with the Root CA certificate ‘ca.crt’ and RSA private key ‘ca.key’, creating a new X.509 certificate named ‘engineCA.crt’ valid for 3650 days (10 years). A "engineCA.srl" file will also be created containing the signed certificate's unique serial number. You will be required to enter the pass phrase associated with the private key file "ca.key".
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openssl x509 -req -in ca/engine/engineCA.csr -CA ca/ca.crt -CAkey ca/ca.key -CAcreateserial -out ca/engine/engineCA.crt -days 3650 |
You should now see the following files created:
├── ca/
│ ├── ca.crt
│ ├── ca.key
│ ├── ca.srl
│ ├── server/
│ │ ├── serverCA.crt
│ │ ├── serverCA.csr
│ │ ├── serverCA.key
│ │ └── serverCA.srl
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└── certs/
├── server/
│ ├── server.crt
│ ├── server.csr
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You should now have the following files:
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