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Building a Certificate Authority in Windows Server 2019 Part 3 – Deploy Root and Subordinate Certificates

3.1 Export the Root and Subordinate Certificates

The easiest method to deploy the Certificates to your organization is to use Group Policy to deploy them automatically to your devices.

  1. Open the Certificates Console (certlm.msc) under the Local Computer Account on the TFS-CA01 Server.
  2. Open the Trusted Root Certification Authorities > Certificates Store and export the TFS Labs Certificate Authority Certificate as a DER encoded binary to the C:\ Drive.
  3. Open the Intermediate Certification Authorities > Certificates Store and export the TFS Labs Enterprise CA Certificate as a DER encoded binary to the C:\ Drive.
  4. On the root of the C:\ Drive on the TFS-DC01 Server, create a folder called Certificates (C:\Certificates).
  5. Copy the C:\TFS Labs Certificate Authority.cer and C:\TFS Labs TFS Labs Enterprise CA.cer files from the TFS-CA01 Server to the C:\Certificates folder on the TFS-DC01 Server.
  6. Optional: If you are going to be using IIS to deploy Certificates within your organization as defined in Step 2.15, you can copy the C:\TFS Labs Certificate Authority.cer and C:\TFS Labs TFS Labs Enterprise CA.cer files to the C:\Certificates folder on the TFS-CA01 Server. You will need to change the extension on these files from *.cer to *.crt for iOS to be able to download them.

3.2 Deploy the Root and Subordinate Certificates to the Domain

For initial deployment of the Certificates to the TFS Labs Domain, it will be applied to the root of the Active Directory Domain. This is something that can be refined later depending on your requirements.

  1. Open the Group Policy Management Console (gpmc.msc) on the TFS-DC01 Server.
  2. In the root of the corp.tfslabs.com Domain, create a new GPO called TFS Labs Certificates.
  3. Right-click on the TFS Labs Certificates GPO and select the Edit option.
  4. In the Group Policy Management Editor window, open the Computer Configuration > Policies > Windows Settings > Security Settings > Public Key Policies node.
  5. Right-click on the Trusted Root Certification Authorities folder and select the Import option. Select the C:\Certificates\TFS Labs Certificate Authority.cer file and import it.
  6. Right-click on the Intermediate Certification Authorities folder and select the Import option. Select the C:\Certificates\TFS Labs Enterprise CA.cer file and import it.
  7. Close the Group Policy Management Console.
  8. Once the Certificates have been added to Group Policy, allow up to 1 hour for the Certificates to be deployed to the entire Active Directory Forest.

3.3 Optional: Deploy Certificates to iOS

Since the Root and Subordinate Certificates are ready for deployment, you can now test that they work correctly on an iOS Device. If you do not have an iOS Device for testing, you can skip this section.

  1. Open Safari on the iOS Device and go to http://tfs-ca01.corp.tfslabs.com/Certificates to access the Root and Subordinate Certificates.
  2. Click on the TFS Labs Certificate Authority.crt file. You should get a popup stating This website is trying to download a configuration profile. Do you want to allow this? and click the Allow button to confirm it. You will then get a prompt that the SSL Profile was downloaded. Click the Close button to continue.
  3. Open the Settings on your iOS device and select the Profile Downloaded menu option. A prompt should appear with the Install Profile options for the TFS Labs Certificate Authority. Click the Install button. You may be prompted to enter your credentials. On the Warning prompt, click the Install button to continue. Click Done to finish the installation.
  4. Go to Settings > General > About > Certificate Trust Settings. Under Enable Full Trust For Root Certificates, enable the TFS Labs Certificate Authority Certificate. A prompt for enabling a Root Certificate will appear, click Continue to complete the trust.
  5. Open Safari on the iOS Device and go to http://tfs-ca01.corp.tfslabs.com/Certificates to access the Root and Subordinate Certificates.
  6. Click on the TFS Labs Enterprise CA.crt file. You should get a popup stating This website is trying to download a configuration profile. Do you want to allow this? and click the Allow button to confirm it. You will then get a prompt that the SSL Profile was downloaded. Click the Close button to continue.
  7. Open the Settings on your iOS device and select the Profile Downloaded menu option. A prompt should appear with the Install Profile options for the TFS Labs Enterprise CA. Click the Install button. You may be prompted to enter your credentials. On the Warning prompt, click the Install button to continue. Click Done to finish the installation.

Certificate Authority in Windows Server 2019

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