Always On VPN Ask Me Anything (AMA) March 2024

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Microsoft Intune Cloud PKI and Active Directory

Recently, Microsoft introduced a new PKI-as-a-Service offering called Cloud PKI. This cloud-based PKI can issue and manage certificates to Intune-managed endpoints. Administrators can now deploy user and device authentication certificates using Intune Cloud PKI without deploying Active Directory Certificate Services (AD CS) on-premises. Numerous blog posts and YouTube videos show how to configure and deploy Intune Cloud PKI, so I won’t reinvent the wheel with a complete configuration guide here. This article will focus instead on integrating Microsoft Intune Cloud PKI with on-premises Active Directory (AD).

Note: Administrators must deploy certificates to all enterprise domain controllers and RADIUS servers to support certificate-based authentication with AD. However, Cloud PKI for Intune can only issue certificates to Intune-managed endpoints today. It cannot issue certificates to servers. Administrators must use another CA (AD CS or another Cloud PKI solution) to issue and manage domain controller and RADIUS server certificates on-premises to support this scenario.

AD Integration

While Intune Cloud PKI eliminates the need for on-premises AD CS infrastructure, there will be times when Cloud PKI-issued certificates will be used to authenticate to on-premises AD, either through a RADIUS server such as Windows Network Policy Server (NPS), which is common for VPN and Wi-Fi deployments, or other methods. Additional configuration is required to support this scenario.

Publish Root/Issuing CA Certificates

The Intune Cloud PKI root and issuing CA certificates must be published in AD to support on-premises AD authentication using Intune Cloud PKI-issued certificates. Follow the steps below to complete this task.

Note: Arguably, you could skip publishing the Intune Cloud PKI root and issuing CA certificates in on-premises AD because Cloud-PKI certificates can only be issued to Intune-managed endpoints, in which case you are likely already deploying the Cloud PKI root and issuing CA certificates using Intune. I’m including these steps for completeness. However, publishing the Intune Cloud PKI issuing CA certificate in the NtAuthCA certificate store in AD is required to support on-premises AD authentication using Intune Cloud PKI-issued certificates, so that step is mandatory.

RootCA Store

On a domain-joined computer on-premises, open an elevated PowerShell or command window and run the following command to publish the Intune Cloud PKI root CA certificate to the RootCA certificate store in AD.

certutil.exe -dspublish -f <path to Cloud PKI root CA certificate> RootCA

SubCA Store

Next, run the following command to publish the Cloud PKI issuing CA certificate to the SubCA certificate store in AD.

certutil.exe -dspublish -f <path to Cloud PKI issuing CA certificate> SubCA

NtAuthCA Store

Finally, run the following command to publish the Intune Cloud PKI issuing CA certificate to the NtAuthCA certificate store in AD. Publishing the Intune Cloud PKI issuing CA certificate in the NtAuthCA store in AD allows certificates issued by Intune Cloud PKI to be used to authenticate on-premises AD if required. Be sure to run this command even if you did not run the previous commands to publish the Intune Cloud PKI root and issuing CA certificates in AD.

certutil.exe -dspublish -f <path to Cloud PKI issuing CA certificate> NtAuthCa

GUI

If you have an existing on-premises AD CS deployment, you can use the Enterprise PKI management console to publish the Intune Cloud PKI certificates in AD as an alternative to the command line. First, open the Enterprise PKI tool (pkiview.msc) on an existing on-premises Certification Authority (CA) server. Right-click the Enterprise PKI root node and choose Manage AD Containers. Add the Intune Cloud PKI root CA certificate to the Certification Authorities container. Next, add the Intune Cloud PKI issuing CA certificate to the Enrollment Services container. Finally, add the Intune Cloud PKI issuing CA certificate to the NTAuthCertificatesContainer.

Summary

Administrators can use the Microsoft Intune Cloud PKI solution to issue and manage user and device authentication certificates for their Intune-managed endpoints. Using the commands above, administrators can also integrate their Intune Cloud PKI with on-premises Active Directory to support user and device authentication for common workloads such as Wi-Fi and VPN. Critically, when integrating Cloud PKI with on-premises Active Directory, your Intune administrators should be considered Tier-0 administrators, and appropriate security controls should be enforced.

Additional Information

Microsoft Intune Cloud PKI

Mastering Certificates with Microsoft Intune Training Course – May 14-16, 2024

Mastering Certificates with Intune Training Course

I’m excited to announce I’ll present a three-day LIVE online training event covering all things Microsoft Intune and certificates. This training event takes place on the ViaMonstra online academy May 14-16, 2024.

Course Material

This training course comprehensively examines all aspects of delivering certificates using Microsoft Intune, including common deployment scenarios, PKCS and SCEP configuration, Intune certificate connector configuration, high availability strategies, implementation and security best practices, and troubleshooting.

Cloud PKI

Cloud PKI, a new cloud-based PKI-as-a-Service solution from Microsoft, will also be covered in depth. I’ll provide an overview of the service and discuss the advantages and limitations of Cloud PKI. We’ll also cover different configuration and deployment scenarios, including Bring Your Own CA (BYOCA). In addition, I’ll share security best practices for Microsoft Cloud PKI deployments.

Register Now

Space is limited, so don’t miss out on this excellent opportunity to learn about these critically essential technologies. Reserve your spot in this training class today!

Additional Information

Mastering Certificates and Microsoft Intune

Microsoft Cloud PKI

ViaMonstra Online Academy