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Access provisioning by data owner to Azure Storage datasets (Preview)

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Important

This feature is currently in preview. The Supplemental Terms of Use for Microsoft Azure Previews include additional legal terms that apply to Azure features that are in beta, in preview, or otherwise not yet released into general availability.

Data owner policies are a type of Microsoft Purview access policies. They allow you to manage access to user data in sources that have been registered for Data Use Management in Microsoft Purview. These policies can be authored directly in the Microsoft Purview governance portal, and after publishing, they get enforced by the data source.

This guide covers how a data owner can delegate in Microsoft Purview management of access to Azure Storage datasets. Currently, these two Azure Storage sources are supported:

  • Blob storage
  • Azure Data Lake Storage (ADLS) Gen2

Prerequisites

Configure the subscription where the Azure Storage account resides for policies from Microsoft Purview

To enable Microsoft Purview to manage policies for one or more Azure Storage accounts, execute the following PowerShell commands in the subscription where you'll deploy your Azure Storage account. These PowerShell commands will enable Microsoft Purview to manage policies on all newly created Azure Storage accounts in that subscription.

If you’re executing these commands locally, be sure to run PowerShell as an administrator. Alternatively, you can use the Azure Cloud Shell in the Azure portal: https://shell.azure.com.

# Install the Az module
Install-Module -Name Az -Scope CurrentUser -Repository PSGallery -Force
# Login into the subscription
Connect-AzAccount -Subscription <SubscriptionID>
# Register the feature
Register-AzProviderFeature -FeatureName AllowPurviewPolicyEnforcement -ProviderNamespace Microsoft.Storage

If the output of the last command shows RegistrationState as Registered, then your subscription is enabled for access policies. If the output is Registering, wait at least 10 minutes, and then retry the command. Do not continue unless the RegistrationState shows as Registered.

Region support

  • All Microsoft Purview regions are supported.
  • Microsoft Purview access policies can only be enforced in the following Azure Storage regions:
    • East US
    • East US2
    • South Central US
    • West US
    • West US2
    • Canada Central
    • North Europe
    • West Europe
    • France Central
    • UK South
    • East Asia
    • Southeast Asia
    • Japan East
    • Japan West
    • Australia East
  • The following regions support only new Azure Storage accounts. That is, Storage accounts created in the subscription after the feature AllowPurviewPolicyEnforcement is Registered.
    • West US
    • East Asia
    • Japan East
    • Japan West

If needed, you can also create a new Storage account by following this guide.

Microsoft Purview configuration

Configure permissions to enable Data use management on the data source

Before a policy can be created in Microsoft Purview for a resource, you must configure permissions. To enable the Data use management toggle for a data source, resource group, or subscription, the same user must have both specific identity and access management (IAM) privileges on the resource and specific Microsoft Purview privileges:

  • The user must have either one of the following IAM role combinations on the resource's Azure Resource Manager path or any parent of it (that is, using IAM permission inheritance):

    • IAM Owner
    • Both IAM Contributor and IAM User Access Administrator

    To configure Azure role-based access control (RBAC) permissions, follow this guide. The following screenshot shows how to access the Access Control section in the Azure portal for the data resource to add a role assignment.

    Screenshot that shows the section in the Azure portal for adding a role assignment.

  • The same user needs to have the Microsoft Purview Data source admin role for the collection or a parent collection (if inheritance is enabled). For more information, see the guide on managing Microsoft Purview role assignments.

    The following screenshot shows how to assign the Data source admin role at the root collection level.

    Screenshot that shows selections for assigning the Data source admin role at the root collection level.

Configure Microsoft Purview permissions to create, update, or delete access policies

The following permissions are needed in Microsoft Purview at the root collection level:

  • The Policy author role can create, update, and delete DevOps and Data Owner policies.
  • The Policy author role can delete self-service access policies.

For more information about managing Microsoft Purview role assignments, see Create and manage collections in the Microsoft Purview Data Map.

Note

Currently, Microsoft Purview roles related to creating, updating, and deleting policies must be configured at the root collection level.

In addition to the Microsoft Purview Policy author role, users might need Directory Readers permission in Azure Active Directory to create a policy. This is a common permission for users in an Azure tenant.

Configure Microsoft Purview permissions for publishing Data Owner policies

Data Owner policies allow for checks and balances if you assign the Microsoft Purview Policy author and Data source admin roles to different people in the organization. Before a data policy takes effect, a second person (Data source admin) must review it and explicitly approve it by publishing it. Publishing is automatic after DevOps or self-service access policies are created or updated, so it doesn't apply to these types of policies.

The following permissions are needed in Microsoft Purview at the root collection level:

  • The Data source admin role can publish a policy.

For more information about managing Microsoft Purview role assignments, see Create and manage collections in the Microsoft Purview Data Map.

Note

Currently, Microsoft Purview roles related to publishing Data Owner policies must be configured at the root collection level.

Delegate access provisioning responsibility to roles in Microsoft Purview

After a resource has been enabled for Data use management, any Microsoft Purview user with the Policy author role at the root collection level can provision access to that data source from Microsoft Purview.

The IAM Owner role for a data resource can be inherited from a parent resource group, a subscription, or a subscription management group. Check which Azure AD users, groups, and service principals hold or are inheriting the IAM Owner role for the resource.

Note

Any Microsoft Purview root Collection admin can assign new users to root Policy author roles. Any Collection admin can assign new users to a Data source admin role under the collection. Minimize and carefully vet the users who hold Microsoft Purview Collection admin, Data source admin, or Policy author roles.

If a Microsoft Purview account with published policies is deleted, such policies will stop being enforced within an amount of time that depends on the specific data source. This change can have implications on both security and data access availability. The Contributor and Owner roles in IAM can delete Microsoft Purview accounts.

You can check these permissions by going to the Access control (IAM) section for your Microsoft Purview account and selecting Role Assignments. You can also use a lock to prevent the Microsoft Purview account from being deleted through Resource Manager locks.

Register the data sources in Microsoft Purview for Data Use Management

The Azure Storage resources need to be registered first with Microsoft Purview to later define access policies.

To register your resources, follow the Prerequisites and Register sections of these guides:

After you've registered your resources, you'll need to enable Data Use Management. Data Use Management needs certain permissions and can affect the security of your data, as it delegates to certain Microsoft Purview roles to manage access to the data sources. Go through the secure practices related to Data Use Management in this guide: How to enable Data Use Management

Once your data source has the Data Use Management toggle Enabled, it will look like this screenshot:

Screenshot that shows how to register a data source for policy by toggling the enable tab in the resource editor.

Create and publish a data owner policy

Execute the steps in the Create a new policy and Publish a policy sections of the data-owner policy authoring tutorial. The result will be a data owner policy similar to the example shown in the image: a policy that provides group Contoso Team read access to Storage account marketinglake1:

Screenshot that shows a sample data owner policy giving access to an Azure Storage account.

Important

  • Publish is a background operation. Azure Storage accounts can take up to 2 hours to reflect the changes.

Unpublish a data owner policy

Follow this link for the steps to unpublish a data owner policy in Microsoft Purview.

Update or delete a data owner policy

Follow this link for the steps to update or delete a data owner policy in Microsoft Purview.

Data Consumption

  • Data consumer can access the requested dataset using tools such as Power BI or Azure Synapse Analytics workspace.
  • Sub-container access: Policy statements set below container level on a Storage account are supported. However, users will not be able to browse to the data asset using Azure portal's Storage Browser or Microsoft Azure Storage Explorer tool if access is granted only at file or folder level of the Azure Storage account. This is because these apps attempt to crawl down the hierarchy starting at container level, and the request fails because no access has been granted at that level. Instead, the App that requests the data must execute a direct access by providing a fully qualified name to the data object. The following documents show examples of how to perform a direct access. See also the blogs in the Next steps section of this how-to-guide.

Additional information

  • Creating a policy at Storage account level will enable the Subjects to access system containers, for example $logs. If this is undesired, first scan the data source(s) and then create finer-grained policies for each (that is, at container or subcontainer level).
  • The root blob in a container will be accessible to the Azure AD principals in a Microsoft Purview allow-type RBAC policy if the scope of such policy is either subscription, resource group, Storage account or container in Storage account.
  • The root container in a Storage account will be accessible to the Azure AD principals in a Microsoft Purview allow-type RBAC policy if the scope of such policy is either subscription, resource group, or Storage account.

Limits

  • The limit for Microsoft Purview policies that can be enforced by Storage accounts is 100 MB per subscription, which roughly equates to 5000 policies.

Known issues

Known issues related to Policy creation

  • Do not create policy statements based on Microsoft Purview resource sets. Even if displayed in Microsoft Purview policy authoring UI, they are not yet enforced. Learn more about resource sets.

Policy action mapping

This section contains a reference of how actions in Microsoft Purview data policies map to specific actions in Azure Storage.

Microsoft Purview policy action Data source specific actions
Read Microsoft.Storage/storageAccounts/blobServices/containers/read
Microsoft.Storage/storageAccounts/blobServices/containers/blobs/read
Modify Microsoft.Storage/storageAccounts/blobServices/containers/blobs/read
Microsoft.Storage/storageAccounts/blobServices/containers/blobs/write
Microsoft.Storage/storageAccounts/blobServices/containers/blobs/add/action
Microsoft.Storage/storageAccounts/blobServices/containers/blobs/move/action
Microsoft.Storage/storageAccounts/blobServices/containers/blobs/delete
Microsoft.Storage/storageAccounts/blobServices/containers/read
Microsoft.Storage/storageAccounts/blobServices/containers/write
Microsoft.Storage/storageAccounts/blobServices/containers/delete

Next steps

Check blog, demo and related tutorials: