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IoT Hub Twin ContributorAzure built-in role

Allows for read and write access to all IoT Hub device and module twins.

Role ID494bdba2-168f-4f31-a0a1-191d2f7c028c
CategoryInternet-of-things
Actions0
Data actions1

Before you assign it

  • It reaches the data, not just the resource. It has 1 data action, such as reading blobs, secrets or messages.

What it can do

No control-plane actions.

Data actions

PermissionWhat it allows
Microsoft.Devices/IotHubs/twins/*Every operation under Microsoft.Devices/IotHubs/twins

Assign it

Scope it as tightly as you can: a resource or resource group rather than the whole subscription.

azure cli
az role assignment create \
  --assignee "jane.doe@contoso.com" \
  --role "IoT Hub Twin Contributor" \
  --scope "/subscriptions/<subscription id>/resourceGroups/<resource group>"
powershell3 lines
New-AzRoleAssignment -SignInName "jane.doe@contoso.com" `
  -RoleDefinitionName "IoT Hub Twin Contributor" `
  -Scope "/subscriptions/<subscription id>/resourceGroups/<resource group>"
bicep7 lines
resource assignment 'Microsoft.Authorization/roleAssignments@2022-04-01' = {
  name: guid(resourceGroup().id, principalId, '494bdba2-168f-4f31-a0a1-191d2f7c028c')
  properties: {
    roleDefinitionId: subscriptionResourceId('Microsoft.Authorization/roleDefinitions', '494bdba2-168f-4f31-a0a1-191d2f7c028c')
    principalId: principalId
  }
}

Who already has it?

kql · azure resource graph
authorizationresources
| where type == "microsoft.authorization/roleassignments"
| where tostring(properties.roleDefinitionId) endswith "494bdba2-168f-4f31-a0a1-191d2f7c028c"
| project principalId = tostring(properties.principalId), principalType = tostring(properties.principalType), scope = tostring(properties.scope)

Other internet-of-things roles

Find the smallest role for a task →

Sources