How Can I Authenticate User Credentials Against Active Directory in .NET?

Securely Verifying User Credentials with Active Directory in .NET

Ensuring the security of your .NET applications requires robust user authentication against Active Directory. The System.DirectoryServices.AccountManagement namespace (available in .NET 3.5 and later) offers a streamlined approach.

Implementation:

Here's how to authenticate user credentials:

using (PrincipalContext pc = new PrincipalContext(ContextType.Domain, "YOURDOMAIN"))
{
    bool isValid = pc.ValidateCredentials("myuser", "mypassword");
}

This code establishes a domain context and validates credentials using ValidateCredentials. isValid will be true upon successful authentication.

Benefits:

• Straightforward and easy to implement.
• Completely managed within C#, ensuring reliability.
• No external libraries or dependencies are needed.

Important Note:

Be aware that this method might return true even for outdated user passwords. This behavior is documented in other Stack Overflow discussions.

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