Digging into Azure AD Certificate-Based Authentication

Azure AD Certificate-Based Authentication is now in public preview, with a surprisingly good documentation. Usually I have to guess how 50% of a feature actually works, but this time they have gone all-in with technical details of just about everything. What is a blogger to do? Well, let’s configure it and see if we can sneak a peek behind the scenes 🙂

Illustration with steps about how Azure AD certificate-based authentication works.
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Checking out Azure AD cross tenant access policies

So, as one does, I was checking out the different Microsoft Graph AppRoles, which are the application scopes available. And then I found this:

Now, I now cross tenant access is something Microsoft has been working on for a while, and I have seen some preview stuff presented, but I have no access to any preview at all at this point. However, let’s see what we can find!

Disclaimer: Do not use this in production, as it is only a private preview feature I discovered.

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Another deep dive into Azure AD Workload Identity Federation using GitHub actions

I just had a previous blogpost about Workload Identity Federation, where I went into the details of how authentication works. This time, I want to use GitHub actions, which is the currently supported method. There are some limitations to the documentation today, but hopefully we will be able to do things like accessing KeyVaults and other services, not only using Azure CLI.

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A deep dive into Azure AD Workload identity federation

Workload Identity Federation is a rather new concept in Azure AD, where service principals do not have keys in a directory, but in stead is federated to an external OpenID Connect (OIDC) provider, such as Okta, Ping, Github, GCP, AWS and – well – Azure AD.

A part of an earlier blogpost used a JWT in a client credential grant, signed by a KeyVault based certificate, to authenticate as an application. This time, this JWT will not be signed by a certificate, but instead by an OIDC provider.

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Script to create named locations for Azure regions

Just built a quick little script that creates named locations for conditional access based on the IP addresses provided and updated by Microsoft, through a json file.

By using this script to manage named locations, you can, through the workload identities conditional access policies currently in preview, limit where your service principals can be used from. You can say things like “These service principals can only be used from Azure region West Europe”.

Find it here in my GitHub!

Assigning PIM Azure RBAC permissions using Terraform and ARM template

Currently, Terraform does not support eligible assignments of permissions in Azure RBAC, and only active assignments using the azurerm_role_assignment resource. Continue reading if you want to be able to assign your eligible assignments using ARM or Terraform (Terraform willl use the ARM template).

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