Delegate access using Azure Lighthouse for a Sentinel POC

TL;DR – Steps to delegate access to users on a different tenant for a Sentinel POC using Azure Lighthouse.

I include this live demo in every webinar I deliver about Microsoft Sentinel, but today a partner asked me for documented step-by-step instructions, which I wasn’t able to find, so I am creating this post.

Most MSSPs need to create a POC to test Microsoft Sentinel, where they configure one workspace as the MSSP and a few other workspaces as customers. To be clear, the documentation is great about the correct way this in a real scenario, where partners need access to their customers’ workspaces, but for a POC, a partner doesn’t need to publish a managed service offer, they just need do this using an ARM template.

From the MSSP tenant

Navigate to “My Customers” and click on “Create ARM Template” as shown below:

Name your offer and choose if you want your customers to delegate access at “Subscription” level or “Resource group” level, then “Add authorization“.

You can choose to delegate access for a User, Group, or Service principal. I usually recommend you use Group over User, because the MSSP team members will change with time.

You can choose to assign the role “Permanent” or “Eligible”. If you’ve worked with PIM (Privileged Identity Management) previously, then you are familiar with the process. The eligible option will require activation before the role can be used. For eligible, you can also choose a specific maximum duration, and whether multifactor authentication and/or approval is required to activate.

In order to see your customers in the “Customers” blade later, you will need to include “Reader” role, as shown below. Click “View template” to be able to download it.

Download the ARM template file.

From the customer tenant

Before you import the template, ensure you have the correct permissions on the subscription. You can follow the steps here to ensure you can deploy the ARM template.

Click “Add offer” and select “Add via template”, as shown below.

Drop the template file you created or upload, as shown below.

Once the file is uploaded, you’ll be able to see it, as shown below:

You can also see the “Role assignments” that were delegated to the MSSP tenant, as shown below.

And if the customer tenant needs to delegate access to new subscriptions, they can do so by clicking on the ‘+’ button, as shown below.

And selecting any other subscriptions or resource groups that need to be delegated.

Back to the MSSP tenant

Now you can see your new customer from the “Customers” blade, as shown below.

Since the delegation included Sentinel Contributors, now you can manage the customer tenant workspace from the Microsoft Sentinel navigation within the MSSP tenant, as shown below.

Bonus: Since you have reader access, you can also see the subscription from Defender for Cloud, Environment settings. You can always delegate additional roles, if you need to manage MDC for this tenant.

Quick note on delegations at Resource Group level. I’ve seen instances with Resource Group delegations, where the ability to update the global filter takes a little while to allow you to select the newly added tenant and subscription that is associated with the resource group. However, after waiting for those updates to kick in, you should be able to modify the filter by selecting the filter from the blue menu bar, as shown below, and updating to include all directories and all subscriptions.

In my opinion, a POC is the best way to experience the wide variety of features within Microsoft Sentinel. You can even use the free trial that is available for 31 days. Another great resource that I always recommend for teams starting to get familiar with Microsoft Sentinel is the Sentinel Training Lab, which is available from the Content Hub blade in Sentinel. Finally, for MSSPs, http://aka.ms/azsentinelmssp is an invaluable resource to get a good overview of the recommended architecture.

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