Practitioner Level

Create a User Delegation SAS using Azure CLI

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1 hour

3 Learning Objectives

About this Hands-on Lab

By using a user delegation SAS, we can help to improve the security of access to an Azure Blob storage container. Unlike a normal shared access signature (SAS), a user delegation SAS is associated with an Azure Active Directory (AAD) identity. A user delegation SAS is a service SAS that only supports Blob storage. In this lab, you will create a user delegation SAS using Azure CLI. We’ll then be able to use this user delegation SAS to access a blob. After completing this lab, you’ll understand how to create and revoke a user delegation SAS using Azure CLI.

Learning Objectives

Successfully complete this lab by achieving the following learning objectives:

Upload a File to Blob Storage

Use the Azure Portal to upload a file to Blob storage.

We will use this file (blob object) later, in order to that the User Delegation SAS we create works as expected.

Navigate to the Storage Accounts section.
Open Storage Accounts from the sidebar, and navigate into the storage account already created for you.
Click on Containers in the storage account working pane.
Open the container named container1.
Click Upload in the command bar.
Select a small file from your computer. Please ensure the file is NOT confidential.
Click Upload.

Create a User Delegation SAS

Use Azure Cloud Shell to create a Bash shell.
- Subscription: Default
- Cloud Shell region: same as your lab provided storage account
- Resource group: Use existing
- Storage account: Use existing
- File share: Create new and enter in cloudshell.
Once in the shell, enter the following to create a user delegation SAS:
```
az storage blob generate-sas --account-name <TAB> 
  --container-name container1 
  --name <FILENAME> 
  --permissions acdrw 
  --expiry <DATE> 
  --auth-mode login 
  --as-user 
  --full-uri
```
- <TAB> is the Tab key to automatically populate the storage account name.
- <FILENAME> is the name of the file you uploaded earlier.
- <DATE> should be a date no more than 7 days from now (YYY-MM-DD).

Note: The command above will generate a full URI to access the file you uploaded to blob storage. You may click on this within Cloud Shell to open a new window and view the file.

Revoke a User Delegation SAS

Still in Cloud Shell, enter the following to revoke all user delegation keys associated with the storage account:

az storage account revoke-delegation-keys --name <TAB> --resource-group <TAB>

<TAB> is the Tab key to automatically populate the storage account name, and then resource group name.

Note: To verify that the user delegation SAS no longer works, you may need to wait up to 5 minutes and then try using the link generated earlier. It should no longer work, and you will see an "AuthenticationFailed" message.

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Additional Resources

You've recently been hired as a security engineer to work for The Pupper Camp (TPC). TPC is a dog services company with offices across the globe.

Your new manager has asked you to test the functionality of a user delegation SAS and demonstrate how to create and revoke access to a blob object.

This is part of a proof of concept for a secure solution that TPC is developing, which will be configured to use an Azure Active Directory (AAD) service principal.

See the Microsoft Documentation for more information on user delegation SAS properties.

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Offer applies only to: new personal and business paying customers, existing personal and business customers who switch to an annual paid plan, and any additional annual plan licenses purchased by existing business customers. Offer valid for a limited time only, beginning 10:00AM CT on February 19, 2021. Offer may not be combined with other offers. Purchases are subject to applicable Terms of Use or Master Services Agreement.

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Learn by doing with guided labs based on real-world scenarios in a secure, risk-free environment. Build new skills in as little as 15 minutes.

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Put your skills to the test

Prepare for your certs with practice exams that mimic the real thing. Plus, get personalized pointers on how to improve your score.

Interactive Diagrams

Study aids on demand

Snag clickable, PDF versions of core concepts to revisit later. Our diagrams make great study aids, help build retention, and can act as handy cheat sheets for a quick refresher down the road.

Video Transcripts & Captions

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Create a User Delegation SAS using Azure CLI

About this Hands-on Lab

Learning Objectives

Additional Resources

Plans & Pricing

Choosing is the first step

Business Basic

Business Plus

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Take your teams from novice to guru

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