Azure Policy allows you to enforce organizational standards and to assess a required compliance state. For example, you can specify that resources in a particular subscription should be restricted to the European Union for deployment only. There are built-in policy definitions for common use cases already included, like implementing governance for resource consistency, regulatory compliance, security, cost, and management. The Azure Policy compliance dashboard provides an aggregated view to evaluate the overall state of the environment. More information about Azure Policy can be found here.
Azure Security Center is a unified infrastructure security management system that strengthens the security posture of your cloud, hybrid, and other cloud environments. It covers two broad pillars of cloud security:
- Cloud security posture management (CSPM): this is also called the free version of Azure Security Center. It includes CSPM features like secure score, detection of misconfigurations in your Azure virtual machines, asset inventory, etc.
- Cloud workload protection (CWP): the integrated workload protection, also called Azure Defender, brings advanced, intelligent protection of your Azure and hybrid resources and workloads. In addition to the built-in policies, when you’ve enabled any Azure Defender plan, you can add custom polices and initiatives. Furthermore, there are regulatory standards included – such as NIST and Azure CIS – as well as the Azure Security Benchmark for a truly customized view of your compliance. More information about Azure Security Center can be found here.
Create an Azure Policy definition
In the first step, we create an Azure Policy definition. I’m sure you may have already any existing ones that you would like to add to the Azure Security Center recommendations pane, which is of course possible as well. In this example, the definition only regulates the Azure location of the resources to be created.
Note: you must be granted at least Resource Policy Contributor permissions.
We regulate – only for the subscription “Visual Studio Enterprise Subscription” – that the allowed locations parameter have europe, northeurope, and westeurope in place.
Create an Azure Policy initiative
An Azure Policy initiative is a collection of Azure Policy definitions, or rules, that are grouped together towards a specific goal or purpose. Azure Security Center initiatives are also created in Azure Policy. You can use either the Azure Policy pane (as we do in this blog post), or you can also create the custom initiative in Azure Security Center directly; the result remains the same.
Note: you must be granted Owner permissions for every subscription you want to add your custom initiative.
Review the recommendations in Azure Security Center
After your Azure Policy definition and Azure Policy initiative has been created and assigned, you can see it first under Regulatory compliance in the Azure Security Center as shown in the following screenshot. (First, because it can take up to one hour or more until the custom initiative is also visible under Recommendations as well).
Note: Access to the regulatory compliance portal is only available if you have an Azure Defender in place (any kind of Azure Defender plan, e. g. Azure Defender for Servers).
And here is the view from the Azure Security Center recommendations:
Enhance your custom recommendations with detailed information
To get a more granular description and severity level, you can add both type of information to your custom recommendations via the REST API. The following two types are available:
- RemediationDescription – String
- Severity – Enum [Low, Medium, High]
The metadata should be added to the policy definition for a policy that is part of the custom initiative. You can edit these values in the Policy definition:
To add the RemediationDescription string and the severity parameter, just add the following JSON data within the properties brackets between line 2 and line 10:
“RemediationDescription”: “Your custom description”,
“Severity”: “severity value (High, Medium, Low)”
Many more PowerShell, Azure CLI, and REST API scripts and automation tasks for Azure Security Center can be found at GitHub. For example, this repository includes:
- Programmatic remediation tools for security recommendations
- PowerShell scripts for programmatic management
- Azure Policy custom definitions for at-scale management of Azure Security Center
- And many more!
In this post, we showed how custom Azure policies can be added to Azure Security Center to generate recommendations. With many subscriptions and resources, especially with agile teams within the organization, this way provides notifications as well as remediations based on the definition in the Azure policy and custom initiative in Azure Security Center.