WinUI3 - CredentialPicker

[Balkoth]

Is there something like this available in WinUI3? CredentialPicker.PickAsync(...) just throws an exception...

[castorix]

This test seems to work for me (Windows 10 21H1 (french), Windows app SDK 1.1.0) :

               uint nSize = 260;
               StringBuilder sbComputerName = new StringBuilder((int)nSize);
               GetComputerName(sbComputerName, ref nSize);
               var options = new CredentialPickerOptions()
               {
                   TargetName = sbComputerName.ToString(),
                   Caption = "Title",
                   Message = "This is a test",
                   CredentialSaveOption = CredentialSaveOption.Selected,
                   AuthenticationProtocol = AuthenticationProtocol.Basic,
                   AlwaysDisplayDialog = true
               };
               CredentialPickerResults results = await CredentialPicker.PickAsync(options);

with

        [DllImport("Kernel32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
        public static extern bool GetComputerName(StringBuilder lpBuffer, ref uint nSize);

I get :

[Balkoth]

Thanks, i could get it to show, but upon closer inspection this "Helper"-class seems like a big security risk to me. The password, if using basic authentication, is returned as a string, so hangs basically around in memory until the application is closed.

My task is the following, maybe anyone can help:

• Open the dialog with a preselected user, not allowing to change the user
• Pass the returned credentials to LogonUser to verify the credentials are valid
• If invalid: Reshow the dialog with ERROR_LOGON_FAILURE as ErrorCode
• If valid: Call a PowerShell API constructing a PSCredential where a SecureString is expected for the password

I can do all this with CredUIPromptForWindowsCredentials, CredPackAuthenticationBuffer, CredUnPackAuthenticationBuffer and CredUIParseUserName, but this is a tedious and also badly underdocumented approach.