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
1) Get the currently logged in windows user name.
2) 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;
}
|
2) 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...