An Azure Policy definition, created in Azure Policy, is a rule about specific security conditions that you want controlled. Built in definitions include things like controlling what type of resources can be deployed or enforcing the use of tags on all resources. You can also create your own custom policy definitions.
Note: Azure security baseline for Azure Storage
This security baseline applies guidance from the Azure Security Benchmark version 1.0 to Azure Storage. The Azure Security Benchmark provides recommendations on how you can secure your cloud solutions on Azure. The content is grouped by the security controls defined by the Azure Security Benchmark and the related guidance applicable to Azure Storage.
You can monitor this security baseline and its recommendations using Microsoft Defender for Cloud. Azure Policy definitions will be listed in the Regulatory Compliance section of the Microsoft Defender for Cloud dashboard.
For example:
* 1.1: Protect Azure resources within virtual networks
Guidance: Configure your storage account's firewall by restricting access to clients from specific public IP address ranges, select virtual networks, or specific Azure resources. You can also configure Private Endpoints so traffic to the storage service from your enterprise travels exclusively over private networks.
* 1.8: Minimize complexity and administrative overhead of network security rules Guidance: For resource in Virtual Networks that need access to your Storage account, use Virtual Network Service tags for the configured Virtual Network to define network access controls on network security groups or Azure Firewall. You can use service tags in place of specific IP addresses when creating security rules.
Reference:
https://docs.microsoft.com/en-us/azure/defender-for-cloud/security-policy-concept
https://docs.microsoft.com/en-us/security/benchmark/azure/baselines/storage-security-baseline