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Storage Blob Data ContributorAzure built-in role

Allows for read, write and delete access to Azure Storage blob containers and data

Role IDba92f5b4-2d11-453d-a403-e96b0029c9fe
CategoryStorage
Actions4
Data actions5

Before you assign it

  • It reaches the data, not just the resource. It has 5 data actions, such as reading blobs, secrets or messages.

What it can do

PermissionWhat it allows
Microsoft.Storage/storageAccounts/blobServices/containers/deleteReturns the result of deleting a container
Microsoft.Storage/storageAccounts/blobServices/containers/readReturns a container
Microsoft.Storage/storageAccounts/blobServices/containers/writeReturns the result of patch blob container
Microsoft.Storage/storageAccounts/blobServices/generateUserDelegationKey/actionReturns a user delegation key for the blob service

Data actions

PermissionWhat it allows
Microsoft.Storage/storageAccounts/blobServices/containers/blobs/deleteReturns the result of deleting a blob
Microsoft.Storage/storageAccounts/blobServices/containers/blobs/readReturns a blob or a list of blobs
Microsoft.Storage/storageAccounts/blobServices/containers/blobs/writeReturns the result of writing a blob
Microsoft.Storage/storageAccounts/blobServices/containers/blobs/move/actionMoves the blob from one path to another
Microsoft.Storage/storageAccounts/blobServices/containers/blobs/add/actionReturns the result of adding blob content

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 "Storage Blob Data Contributor" \
  --scope "/subscriptions/<subscription id>/resourceGroups/<resource group>"
powershell3 lines
New-AzRoleAssignment -SignInName "jane.doe@contoso.com" `
  -RoleDefinitionName "Storage Blob Data Contributor" `
  -Scope "/subscriptions/<subscription id>/resourceGroups/<resource group>"
bicep7 lines
resource assignment 'Microsoft.Authorization/roleAssignments@2022-04-01' = {
  name: guid(resourceGroup().id, principalId, 'ba92f5b4-2d11-453d-a403-e96b0029c9fe')
  properties: {
    roleDefinitionId: subscriptionResourceId('Microsoft.Authorization/roleDefinitions', 'ba92f5b4-2d11-453d-a403-e96b0029c9fe')
    principalId: principalId
  }
}

Who already has it?

kql · azure resource graph
authorizationresources
| where type == "microsoft.authorization/roleassignments"
| where tostring(properties.roleDefinitionId) endswith "ba92f5b4-2d11-453d-a403-e96b0029c9fe"
| project principalId = tostring(properties.principalId), principalType = tostring(properties.principalType), scope = tostring(properties.scope)

Other storage roles

Find the smallest role for a task →

Sources