Today one of my friend asked me how we can perform validating user windows login credentials. In past also i saw in many forums people asking similar questions.
actaully there are 2 different scenarios
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Get the currently logged in windows user name.
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Prompt the user for user and password, and validate the provided user name and password are a valid user credentials
following is the c# code which will answer these scenarios.
1) Get currently logged in user details: This is pretty straight forward approach. We can achieve this by using the WindowsIdentity class of System.Security.Principal namespace. This class provides a static method, getCurrent(), which return a object of WindowsIdentity.
Bellow is the code you can use to get the current logged in user details.
public string GetloggedinUserName() { System.Security.Principal.WindowsIdentity currentUser = System.Security.Principal.WindowsIdentity.GetCurrent(); return currentUser.Name; } |
- Validate windows credentials provided by user: This is little complex compared to above as we need to call a windows API using IntropServices. To accomplish this we need to add a extern function declaration, and then call the function. Following code will help you to understand this better.
class Program { [System.Runtime.InteropServices.DllImport("advapi32.dll")] public static extern bool LogonUser(string userName, string domainName, string password, int LogonType, int LogonProvider,ref IntPtr phToken); static void Main(string[] args) { Program obj = new Program(); bool isValid = obj.IsValidateCredentials("myUserName","MyPassword","MyDomain"); Console.WriteLine(isValid == true ? "Valid User details" : "Invalid User Details"); Console.Read(); } public bool IsValidateCredentials(string userName, string password, string domain) { IntPtr tokenHandler = IntPtr.Zero; bool isValid = LogonUser(userName, domain, password, 2, 0, ref tokenHandler); return isValid; } } |
Hope this will be useful for people who want to perform windows authentication in winform applications...
Happy coding 