Azure built-in roles for blobs

Azure RBAC provides several built-in roles for authorizing access to blob data using Microsoft Entra ID and OAuth. Some examples of roles that provide permissions to data resources in Azure Storage include:

  • Storage Blob Data Owner: Use to set ownership and manage POSIX access control for Azure Data Lake Storage Gen2. 
  • Storage Blob Data Contributor: Use to grant read/write/delete permissions to Blob storage resources.
  • Storage Blob Data Reader: Use to grant read-only permissions to Blob storage resources.
  • Storage Blob Delegator: Get a user delegation key to use to create a shared access signature that is signed with Microsoft Entra credentials for a container or blob.

To learn how to assign an Azure built-in role to a security principal, see Assign an Azure role for access to blob data. To learn how to list Azure RBAC roles and their permissions, see List Azure role definitions.

Only roles explicitly defined for data access permit a security principal to access blob data. Built-in roles such as Owner, Contributor, and Storage Account Contributor permit a security principal to manage a storage account, but don't provide access to the blob data within that account via Microsoft Entra ID. However, if a role includes Microsoft.Storage/storageAccounts/listKeys/action, then a user to whom that role is assigned can access data in the storage account via Shared Key authorization with the account access keys. 

For detailed information about Azure built-in roles for Azure Storage for both the data services and the management service, see the Storage section in Azure built-in roles for Azure RBAC. Additionally, for information about the different types of roles that provide permissions in Azure, see Azure roles, Microsoft Entra roles, and classic subscription administrator roles.

Azure role assignments may take up to 30 minutes to propagate.


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