Github SSL Authentication

Here’s a step-by-step guide to creating a certificate on Ubuntu 20.04 and adding it to Linux for authentication with GitHub:

  1. Install OpenSSL

    • Open a terminal and run the following command: sudo apt-get update
    • Install OpenSSL by running the following command: sudo apt-get install openssl
  2. Create a Private Key

    • Navigate to the directory where you want to create the private key and run the following command: openssl genpkey -algorithm RSA -out private-key.pem -aes256
    • The above command will create an AES-256 encrypted RSA private key.
  3. Create a Certificate Signing Request (CSR)

    • Run the following command to create a CSR: openssl req -key private-key.pem -new -out certificate-signing-request.csr
    • Fill in the required information to generate the CSR. The information is used to identify the entity requesting the certificate and to verify the identity of the entity.
  4. Sign the Certificate

    • Self-Sign the Certificate: To self-sign the certificate, run the following command: openssl x509 -req -days 365 -in certificate-signing-request.csr -signkey private-key.pem -out certificate.pem
    • Sign the Certificate with a Certificate Authority (CA): If you want to sign the certificate with a CA, you’ll need to submit the CSR to the CA, who will then sign the certificate and return it to you.
  5. Verify the Certificate

    • To verify the certificate, run the following command: openssl x509 -noout -text -in certificate.pem
  6. Add the Certificate to the System

    • To add the certificate to the system, run the following command: sudo cp certificate.pem /usr/local/share/ca-certificates
    • Update the CA certificate store by running the following command: sudo update-ca-certificates
  7. Configure Git to Use the Certificate

    • Run the following command to configure Git to use the certificate: git config --global http.sslCert <path/to/certificate.pem>
    • Verify the configuration by running the following command: git ls-remote --heads
  8. Use the Certificate with GitHub

    • Clone the repository using the HTTPS URL and the environment variable. You can do this by running the following command: git clone https://<username>:[email protected]/<username>/<repository>.git
    • Replace “username” with your GitHub username and “repository” with the name of the repository you want to clone.

With these steps, you should now be able to use the certificate for authentication with GitHub. Note that the certificate must be installed on all systems that you want to use it on, and it must be installed in the correct location and format.

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