Error in Mapping Dataflow - 403, PUT, AuthorizationPermissionMismatch - request is not authorized

Kia 31

I've built a dataflow to perform a simple task - read from raw zone > drop duplicates > write to refined zone. Even though the permissions have been set correctly RWX for the Synapse MI (ACLs), I am encountering the following error -

https://<storage>.dfs.core.usgovcloudapi.net/zones/refined/e2c80414-9938-4811-a951-5393d65f8575/_temporary/0/_temporary/attempt_202406131420357194952145992489560_0005_m_000000_289/part-00000-4d9d8e99-1fb9-4da9-a055-e6e69a77253b.c000.snappy.parquet?action=append&position=0&timeout=90,

AuthorizationPermissionMismatch, "This request is not authorized to perform this operation using this permission. RequestId:" at org.apache.hadoop.fs.azurebfs.services.AbfsRestOperation.execute(AbfsRestOperation.java:207) at org.apache.hadoop.fs.azurebfs.services.AbfsClient.append(AbfsClient.java:444) at org.apache.hadoop.fs.azurebfs.services.AbfsOutputStream.lambda$writeCurrentBufferToService$0(AbfsOutputStream.java:458)

Requesting assistance from anyone who might have encountered and fixed this error.

Harishga 5,590 Reputation points Microsoft Vendor

2024-06-14T10:01:12.1866667+00:00
Hi @Kia
Welcome to Microsoft Q&A platform and thanks for posting your question here.

Based on the error message you provided, it seems that you are facing an "AuthorizationPermissionMismatch" error while trying to write data to a refined zone in your storage account using a dataflow in Synapse Analytics. This error occurs when the request is not authorized to perform the operation using the current permission.

You mentioned that you have built a dataflow to read from a raw zone, drop duplicates, and write to a refined zone. Even though the permissions have been set correctly RWX for the Synapse MI (ACLs), you are facing the "AuthorizationPermissionMismatch" error.

To resolve this issue, you can try the following steps:

Verify that the Synapse MI has the correct permissions to access the storage account. Ensure that the MI has the Storage Blob Data Contributor role assigned to it. You can check this by navigating to the storage account in the Azure portal, selecting Access control, and verifying that the MI is listed under the Storage Blob Data Contributor section with the role assigned to it.

Check if the credentials used by the Synapse MI to access the storage account have expired. If the credentials have expired, you can regenerate them by navigating to the storage account in the Azure portal, selecting Access keys, and regenerating the key.

Ensure that the storage account and container have the correct access control lists set up. You can check this by navigating to the storage account in the Azure portal, selecting Access control, and verifying that the correct permissions are set up for the container.

Check if the storage account firewall is blocking the request. If the storage account firewall is enabled, ensure that the Synapse MI's IP address is added to the allowed IP list.

Verify that the storage account and container names are correct and that the Synapse MI is using the correct URL to access the storage account.

If the issue persists, you can try enabling diagnostic logging for the storage account to get more information about the error. You can also check the Azure Synapse Analytics and Azure Storage logs for more information about the error.

I hope this information helps you. Let me know if you have any further questions or concerns.
Harishga 5,590 Reputation points Microsoft Vendor

2024-06-17T04:43:56.8333333+00:00

@Kia
We haven’t heard from you on the last response and was just checking back to see if you have a resolution yet. In case if you have any resolution please do share that same with the community as it can be helpful to others. Otherwise, will respond with more details and we will try to help.
Kia 31 Reputation points

2024-06-17T12:08:03.3966667+00:00

Why would the MI need Storage Blob Data Contributor role? Aren't the ACLs enough? The fact that MI can read the data to process (R and W are in the same container, different dirs) confirms that there is no firewall issue, names are correct and no credentials involved.
Kia 31 Reputation points

2024-06-26T18:31:54.0733333+00:00

Harishga, ACLs grant RWX permissions - Read, WRITE, execute. So its still confusing for me why those should not work, considering that the pre-processing mkdir command is working and creating a folder.

Anyways, we granted the Storage Blob Data Contributor role on the container level (not storage account) and its working. Still don't have evidence of why that level of permissions would be needed. Its not a secure implementation since we are violating the Principal of Least Privilege by granting the MI more permissions than it needs to perform the job. Any alternative to this approach?
Harishga 5,590 Reputation points Microsoft Vendor

2024-06-27T07:28:48.47+00:00

@Kia
When you’re setting up permissions for your Managed Identity in Azure, it’s important to give it just enough access to do its job—no more, no less. This is called the Principle of Least Privilege. ACLs, or Access Control Lists, let you set detailed permissions for files and folders. But sometimes, you need more than that. The Storage Blob Data Contributor role gives your MI the power to write data to the storage, which ACLs don’t cover by themselves. If you want to keep things tight and secure, you can create a separate Managed Identity that has only the permissions it needs. Or you can make custom roles that fit the job perfectly.

Another thing you can do is use ABAC, which means you add special conditions to the roles, making sure the MI can only access what it really needs to. This way, you’re keeping your setup secure and following the Principle of Least Privilege.

1 answer

Harishga 5,590 Reputation points Microsoft Vendor

2024-06-18T07:37:22.2466667+00:00

Hi @Kia
The reason why the Synapse MI needs the Storage Blob Data Contributor role is that it requires the permission to write data to the storage account. Even though the ACLs are set up correctly, the MI still needs the role to perform write operations. The ACLs only control access to the container and its contents, but not the permissions required to perform write operations.

You mentioned that the MI can read the data to process, which confirms that there is no firewall issue, and the names are correct. However, it is still possible that the MI does not have the required permissions to write data to the container. I would recommend checking if the MI has the Storage Blob Data Contributor role assigned to it and verifying that the correct permissions are set up for the container.

I hope this information helps you. Let me know if you have any further questions or concerns.
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Error in Mapping Dataflow - 403, PUT, AuthorizationPermissionMismatch - request is not authorized

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