Short Answer 
A Shared Access Signature (SAS) in Azure allows specific limited access to storage resources while enhancing security. To control access for User1, generate a SAS with a defined access period from January 1 to January 31, 2024, and share the SAS URL to enable secure access without granting full permissions.
Step 1: Understand Shared Access Signatures (SAS)
A Shared Access Signature (SAS) is a powerful tool in Azure that enables you to grant limited access to resources within your storage account. It defines specific permissions, such as reading or writing, and sets an access period. This allows users to interact with storage resources without giving them full access credentials, thereby enhancing security.
Step 2: Set the Access Period for User1
To ensure User1 can access the storage account only during the specified timeframe, generate a SAS with a defined start and expiry date. For this case, set the dates from January 1st to January 31st, 2024. This method permits User1 to access storage1 solely within this window, ensuring control over their actions.
Step 3: Provide the SAS to User1
After configuring the SAS with the necessary permissions and the designated access period, share the SAS URL with User1. By using this SAS, User1 can securely access storage1 without the need for additional permissions or access keys, thus maintaining both security and operational efficiency in your Azure environment.