The table under this section https://learn.microsoft.com/en-us/azure/storage/common/storage-use-azcopy-v10#authorize-azcopy says SAS is supported for Files At the same time, the table under this Section https://learn.microsoft.com/en-us/azure/storage/common/authorize-data-access#understand-authorization-for-data-operations says SAS is NOT supported for Azure Files(SMB) Should it be supported in both places ? Or Am I missing anything ?

Hi, The documentation is correct. SAS isn't supported when using SMB protocol to access Azure Files, but it is supported when using REST API to access Azure Files. AzCopy uses REST API. Please click Accept Answer if the above was helpful. Thanks. -TP

Azure Files Authorization

Accepted answer

TP 83,971 Reputation points

2023-07-15T16:42:47.1366667+00:00

Hi,

The documentation is correct. SAS isn't supported when using SMB protocol to access Azure Files, but it is supported when using REST API to access Azure Files. AzCopy uses REST API.

Please click Accept Answer if the above was helpful.

Thanks.

-TP
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Shridhar Srinivasan 215 Reputation points

2023-07-17T11:12:18.3833333+00:00

Thanks

Shridhar Srinivasan 215 Reputation points

2023-07-21T10:48:10.18+00:00

If azcopy uses REST, then

as per this page, it supports Shared Key, SAS and Az AD

But

as per this page, it supports SAS only

Something is surely wrong.

TP 83,971 Reputation points

2023-07-21T12:37:20.8966667+00:00

@Shridhar Srinivasan Nothing is wrong. First page you linked to is for what is supported by the service. Second page you linked to is what is supported by azcopy.

Key point to understand is that just because a service has certain capabilities doesn't necessarily mean that a client program (azcopy in this case) will support all of them. It is common to only support a subset.

Shridhar Srinivasan 215 Reputation points

2023-07-21T14:55:17.66+00:00

Thanks for the responseThere would be a logical reason and I am looking for that reason.

deherman-MSFT 35,636 Reputation points Microsoft Employee

2023-07-21T15:07:23.74+00:00

@Shridhar Srinivasan

Trying to understand the ask and the need here. You are asking both about Azure Files (SMB) and Azcopy for Azure Files. Which one are you hoping to use and what is the capability you want but you see as not supported or are not sure about?

TP 83,971 Reputation points

2023-07-21T15:30:54.1466667+00:00

@Srinivasan, Shridhar (Shridhar) It can be many reasons. If I had to guess I would say other features were a higher priority to get done first.

For example, let's say you started developing applications for Azure. Will your first released application support every possible service, REST API call, etc., that Azure offers? Or will it only support some subset that you decide for various reasons is "first priority", and then you would add features over time?

You can check out azcopy issues tagged as feature requests. There are some related ones:

https://github.com/Azure/azure-storage-azcopy/issues?q=is%3Aopen+is%3Aissue+label%3A%22feature+request%22

This is a common pattern not only with Microsoft, but every other software manufacturer. Another example, long before Azure existed, Microsoft had features in its Windows Server operating system that were supported partially, fully, or not at all by its various client operating systems and client tools.

This is one of the main reasons these types of things are documented.

Shridhar Srinivasan 215 Reputation points

2023-07-21T20:17:29.82+00:00

Thanks TP. That is logical.

It is hard to digest azcopy has not added other authorization support when it seems to have been around since 2018.

Thanks again for your patience in explaining the difference.
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