login

using System;
using System.Runtime.InteropServices;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Security;


namespace SharePoint_Info
{

    public class creds
    {
        private class UNPW
        {
            private List<UnPw> loginCreds;
            public List<UnPw> LoginCreds
            {
                get { return loginCreds; }
                set
                {
                    loginCreds = value;
                }
            }
        }
    }
    class creduiprompt
    {
        /// <summary>
        /// Leverages the windows UI to prompt for a password
        /// </summary>
        internal static class Authentication
        {
            public struct CREDUI_INFO
            {
                public int cbSize;
                public IntPtr hwndParent;
                public string pszMessageText;
                public string pszCaptionText;
                public IntPtr hbmBanner;
            }

            [DllImport("credui")]
            private static extern CredUIReturnCodes CredUIPromptForCredentials(ref CREDUI_INFO creditUR,
                  //string targetName,
                  IntPtr reserved1,
                  int iError,
                  StringBuilder userName,
                  int maxUserName,
                  StringBuilder password,
                  int maxPassword,
                  [MarshalAs(UnmanagedType.Bool)] ref bool pfSave,
                  CREDUI_FLAGS flags);

            [Flags]
            enum CREDUI_FLAGS
            {
                INCORRECT_PASSWORD = 0x1,
                DO_NOT_PERSIST = 0x2,
                REQUEST_ADMINISTRATOR = 0x4,
                EXCLUDE_CERTIFICATES = 0x8,
                REQUIRE_CERTIFICATE = 0x10,
                SHOW_SAVE_CHECK_BOX = 0x40,
                ALWAYS_SHOW_UI = 0x80,
                REQUIRE_SMARTCARD = 0x100,
                PASSWORD_ONLY_OK = 0x200,
                VALIDATE_USERNAME = 0x400,
                COMPLETE_USERNAME = 0x800,
                PERSIST = 0x1000,
                SERVER_CREDENTIAL = 0x4000,
                EXPECT_CONFIRMATION = 0x20000,
                GENERIC_CREDENTIALS = 0x40000,
                USERNAME_TARGET_CREDENTIALS = 0x80000,
                KEEP_USERNAME = 0x100000,
            }

            public enum CredUIReturnCodes
            {
                NO_ERROR = 0,
                ERROR_CANCELLED = 1223,
                ERROR_NO_SUCH_LOGON_SESSION = 1312,
                ERROR_NOT_FOUND = 1168,
                ERROR_INVALID_ACCOUNT_NAME = 1315,
                ERROR_INSUFFICIENT_BUFFER = 122,
                ERROR_INVALID_PARAMETER = 87,
                ERROR_INVALID_FLAGS = 1004,
            }

            /// <summary>
            /// Prompts for password.
            /// </summary>
            /// <param name="user">The user.</param>
            /// <param name="password">The password.</param>
            /// <returns>True if no errors.</returns>
            internal static List<UnPw> PromptForPassword(out string user, out string password)
            {
                // Setup the flags and variables
                StringBuilder userPassword = new StringBuilder(), userID = new StringBuilder();
                CREDUI_INFO credUI = new CREDUI_INFO();
                credUI.cbSize = Marshal.SizeOf(credUI);
                bool save = false;
                CREDUI_FLAGS flags = CREDUI_FLAGS.ALWAYS_SHOW_UI | CREDUI_FLAGS.GENERIC_CREDENTIALS;

                // Prompt the user
                CredUIReturnCodes returnCode = CredUIPromptForCredentials(ref credUI, IntPtr.Zero, 0, userID, 100, userPassword, 100, ref save, flags);

                user = userID.ToString();
                password = userPassword.ToString();
                var usersec = new SecureString();
                foreach (char c in password)
                {
                    usersec.AppendChar(c);
                }
                List<UnPw> cred = new List<UnPw>();
                UnPw item = new UnPw();
                {
                    item.UserName = user;
                    item.UserPW = usersec;
                    cred.Add(item);
                }
                return cred;
            }
        }
    }
}