Validate a user's identity based on a provided password and salt, all while remaining unaware of the encryption technique

Scenario

In my current project, I am working with a SQL Server database that contains a table named aspnet_Membership, which appears to have been generated by ASP.NET. Although our system's frontend no longer utilizes ASP.NET, we still need to authenticate users using the data stored in this old database.

Available Information

It seems that the Password and PasswordSalt columns in the table are crucial for authenticating a user. Unfortunately, I am unsure about the encryption method that was used in the original system.

A sample password entry resembles: K9YjVGWxF4bPQCvQ8VYA1vbQyCE=, while the password salt is represented as: CM9k+UbZuKTuFxI46vIVIA==.

Additionally, there is a PasswordAnswer field in the table that likely uses the same encryption method. However, I believe its relevance to user authentication is minimal.

Request

I am seeking guidance on how to authenticate a user based on the provided password and salt values (preferably using ExpressJS). Any assistance would be greatly appreciated.

Thank you in advance.

javascriptasp.netexpressauthenticationpassword-encryption

Answer №1

To uncover the method used for logging in, begin by launching your web browser and navigating to the main page of your application. Next, open the development console and access the Network tab. Proceed to log in, observe where the request is directed, analyze the code, and identify the authentication method for your login process.

An alternative approach involves delving into the usage of the Password field within the ORM utilized (if applicable) to determine its storage during registration or settings modification, as well as how it is authenticated during login.

If these methods prove fruitless, perform a thorough search throughout the source code for instances of the term "password" to pinpoint areas related to password authentication and storage.

In the event that this strategy proves unproductive, search for occurrences of the term "salt" within the source code for potentially valuable information.

If all else fails, conduct searches for key terms such as "login" or "authenticate" in the source code.

If all attempts are unsuccessful, consider thinking outside the box in your investigative efforts or seek assistance from a team member who possesses the necessary knowledge.

Upon discovering a method that accepts a string input for the password, generates another string output, and compares them with the password and salt, you have successfully identified the intended method. Once determined, ensure the implementation of this method in your project or devise a similar approach for user authentication purposes.

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