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Protect your resource hierarchy

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Your resources, resource groups, subscriptions, management groups, and tenant compose your resource hierarchy. Settings at the root management group, such as Azure custom roles or policy assignments, can affect every resource in your resource hierarchy. It's important to protect the resource hierarchy from changes that could negatively affect all resources.

Management groups have hierarchy settings that enable the tenant administrator to control these behaviors. This article covers each of the available hierarchy settings and how to set them.

Azure RBAC permissions for hierarchy settings

Configuring hierarchy settings requires the following resource provider operations on the root management group:

  • Microsoft.Management/managementgroups/settings/write
  • Microsoft.Management/managementgroups/settings/read

These operations represent Azure role-based access control (Azure RBAC) permissions. They only allow a user to read and update the hierarchy settings. They don't provide any other access to the management group hierarchy or to resources in the hierarchy.

Both of these operations are available in the Azure built-in role Hierarchy Settings Administrator.

Setting: Define the default management group

By default, a new subscription that you add in a tenant becomes a member of the root management group. If you assign policy assignments, Azure RBAC, and other governance constructs to the root management group, they immediately affect these new subscriptions. For this reason, many organizations don't apply these constructs at the root management group, even though that's the desired place to assign them. In other cases, an organization wants a more restrictive set of controls for new subscriptions but doesn't want to assign them to all subscriptions. This setting supports both use cases.

By allowing the default management group for new subscriptions to be defined, you can apply organization-wide governance constructs at the root management group. You can define a separate management group with policy assignments or Azure role assignments that are more suited to a new subscription.

Define the default management group in the portal

  1. Sign in to the Azure portal.

  2. Use the search bar to search for and select Management groups.

  3. Select the root management group.

  4. Select Settings on the left side of the page.

  5. Select the Change default management group button.

    If the Change default management group button is unavailable, the cause is one of these conditions:

    • The management group that you're viewing isn't the root management group.
    • Your security principal doesn't have the necessary permissions to alter the hierarchy settings.

  6. Select a management group from your hierarchy, and then choose the Select button.

Define the default management group by using the REST API

To define the default management group by using the REST API, you must call the Hierarchy Settings endpoint. Use the following REST API URI and body format. Replace {rootMgID} with the ID of your root management group. Replace {defaultGroupID} with the ID of the management group that will become the default management group.

  • REST API URI:

    PUT https://management.azure.com/providers/Microsoft.Management/managementGroups/{rootMgID}/settings/default?api-version=2020-05-01

  • Request body:

    {
    "properties": {
        "defaultManagementGroup": "/providers/Microsoft.Management/managementGroups/{defaultGroupID}"
    }
}

To set the default management group back to the root management group, use the same endpoint and set defaultManagementGroup to a value of /providers/Microsoft.Management/managementGroups/{rootMgID}.

Setting: Require authorization

Any user, by default, can create new management groups in a tenant. Admins of a tenant might want to provide these permissions only to specific users, to maintain consistency and conformity in the management group hierarchy. To create child management groups, a user requires the Microsoft.Management/managementGroups/write operation on the root management group.

Require authorization in the portal

  1. Sign in to the Azure portal.

  2. Use the search bar to search for and select Management groups.

  3. Select the root management group.

  4. Select Settings on the left side of the page.

  5. Turn on the Permissions for creating new management groups toggle.

    If the Require write permissions for creating new management groups toggle is unavailable, the cause is one of these conditions:

    • The management group that you're viewing isn't the root management group.
    • Your security principal doesn't have the necessary permissions to alter the hierarchy settings.

Require authorization by using the REST API

To require authorization by using the REST API, call the Hierarchy Settings endpoint. Use the following REST API URI and body format. This value is a Boolean, so provide either true or false for the value. A value of true enables this method of protecting your management group hierarchy.

  • REST API URI:

    PUT https://management.azure.com/providers/Microsoft.Management/managementGroups/{rootMgID}/settings/default?api-version=2020-05-01

  • Request body:

    {
    "properties": {
        "requireAuthorizationForGroupCreation": true
    }
}

To turn off the setting, use the same endpoint and set requireAuthorizationForGroupCreation to a value of false.

Azure PowerShell sample

Azure PowerShell doesn't have an Az command to define the default management group or to require authorization. As a workaround, you can use the REST API with the following Azure PowerShell sample:

$root_management_group_id = "Enter the ID of root management group"
$default_management_group_id = "Enter the ID of default management group (or use the same ID of the root management group)"

$body = '{
     "properties": {
          "defaultManagementGroup": "/providers/Microsoft.Management/managementGroups/' + $default_management_group_id + '",
          "requireAuthorizationForGroupCreation": true
     }
}'

$token = (Get-AzAccessToken).Token
$headers = @{"Authorization"= "Bearer $token"; "Content-Type"= "application/json"}
$uri = "https://management.azure.com/providers/Microsoft.Management/managementGroups/$root_management_group_id/settings/default?api-version=2020-05-01"

Invoke-RestMethod -Method PUT -Uri $uri -Headers $headers -Body $body

Related content

To learn more about management groups, see: