Assign Azure roles for access rights

Microsoft Entra authorizes access rights to secured resources through Azure RBAC. Azure Storage defines a set of built-in RBAC roles that encompass common sets of permissions used to access blob data. You can also define custom roles for access to blob data.

A Microsoft Entra security principal may be a user, a group, an application service principal, or a managed identity for Azure resources. The RBAC roles that are assigned to a security principal determine the permissions that the principal has for the specified resource.

In some cases you may need to enable fine-grained access to blob resources or to simplify permissions when you have a large number of role assignments for a storage resource. You can use Azure attribute-based access control (Azure ABAC) to configure conditions on role assignments. You can use conditions with a custom role or select built-in roles. 

When you create an Azure Storage account, you are not automatically assigned permissions to access data via Microsoft Entra ID. You must explicitly assign yourself an Azure role for access to Blob Storage. You can assign it at the level of your subscription, resource group, storage account, or container.

Resource scope

Before you assign an Azure RBAC role to a security principal, determine the scope of access that the security principal should have. Best practices dictate that it's always best to grant only the narrowest possible scope. Azure RBAC roles defined at a broader scope are inherited by the resources beneath them.

You can scope access to Azure blob resources at the following levels, beginning with the narrowest scope:

  • An individual container. At this scope, a role assignment applies to all of the blobs in the container, and to the container properties and metadata.
  • The storage account. At this scope, a role assignment applies to all containers and their blobs.
  • The resource group. At this scope, a role assignment applies to all of the containers in all of the storage accounts in the resource group.
  • The subscription. At this scope, a role assignment applies to all of the containers in all of the storage accounts in all of the resource groups in the subscription.
  • A management group. At this scope, a role assignment applies to all of the containers in all of the storage accounts in all of the resource groups in all of the subscriptions in the management group.


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