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How to use IE authentication dialog window programmatically

So, there are two methods deals with credential dialog of IE

CredUIPromptForCredentials – for pop it up and CredUIConfirmCredentials for persist those settings in password manager (optional). So, in order to call it explicitly, you should implement them via P/Invoke like this

[DllImport("credui.dll", EntryPoint = "CredUIConfirmCredentialsW", CharSet = CharSet.Unicode)]

       private static extern CredUIReturnCodes CredUIConfirmCredentials(string targetName, [MarshalAs(UnmanagedType.Bool)] bool confirm);

[DllImport("credui.dll", EntryPoint = "CredUIPromptForCredentials", CharSet = CharSet.Ansi)]

       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);

Please pay attention, that you’ll need CREDI_INFO structure and CREDI_FLAG and CredUIReturnCodes enums, that those function using

public struct CREDUI_INFO

{

   public int cbSize;

   public IntPtr hwndParent;

   public string pszMessageText;

   public string pszCaptionText;

   public IntPtr hbmBanner;

}

[Flags]

enum CREDUI_FLAGS

{

   INCORRECT_PASSWORD = 0×1,

   DO_NOT_PERSIST = 0×2,

   REQUEST_ADMINISTRATOR = 0×4,

   EXCLUDE_CERTIFICATES = 0×8,

   REQUIRE_CERTIFICATE = 0×10,

   SHOW_SAVE_CHECK_BOX = 0×40,

   ALWAYS_SHOW_UI = 0×80,

   REQUIRE_SMARTCARD = 0×100,

   PASSWORD_ONLY_OK = 0×200,

   VALIDATE_USERNAME = 0×400,

   COMPLETE_USERNAME = 0×800,

   PERSIST = 0×1000,

   SERVER_CREDENTIAL = 0×4000,

   EXPECT_CONFIRMATION = 0×20000,

   GENERIC_CREDENTIALS = 0×40000,

   USERNAME_TARGET_CREDENTIALS = 0×80000,

   KEEP_USERNAME = 0×100000,

}

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,

}

Now, when you have those calls, you may want to make some wrappers (like those)

const int MAX_USER_NAME = 100;

const int MAX_PASSWORD = 100;

const int MAX_DOMAIN = 100;

static CredUIReturnCodes PromptForCredentials(ref CREDUI_INFO creditUI, string targetName, int netError, ref string userName, ref string password, ref bool save, CREDUI_FLAGS flags)

{

                         StringBuilder user = new StringBuilder(MAX_USER_NAME);

                         StringBuilder pwd = new StringBuilder(MAX_PASSWORD);

                         creditUI.cbSize = Marshal.SizeOf(creditUI);

                         CredUIReturnCodes result = CredUIPromptForCredentials(ref creditUI, targetName,IntPtr.Zero, netError,user, MAX_USER_NAME, pwd, MAX_PASSWORD, ref save, flags);

                                                  userName = user.ToString();

                                                  password = pwd.ToString();

                         return result;

}

CredUIReturnCodes AskCredit(ref string username, ref string password)

{

                         string host = url.Host;

                         CREDUI_INFO info = new CREDUI_INFO();

                         info.pszCaptionText = host;

                         info.pszMessageText = “The server “+host+” requires a username and password. \r\n\r\n\r\nWarning: This server is requesting that your username and password be sent in an insecure manner (basic                                                                            authentication without a secure connection).”;

                         CREDUI_FLAGS flags = CREDUI_FLAGS.GENERIC_CREDENTIALS |

                                                  CREDUI_FLAGS.SHOW_SAVE_CHECK_BOX |

                                                  CREDUI_FLAGS.ALWAYS_SHOW_UI |

                                                  CREDUI_FLAGS.EXPECT_CONFIRMATION;

                         bool savePwd = false;

                         CredUIReturnCodes result = PromptForCredentials(ref info, host, 0, ref username,

                         ref password, ref savePwd, flags);

return result;

}

After it, you should call AskCredit to get the credit window pop up and get secured username and password from them. Something like this

CredUIReturnCodes code = AskCredit(ref user, ref pwd);

                         if (code == CredUIReturnCodes.NO_ERROR)

                         {

//Do something useful

                         }

The next part is to provide those credentials to your HTTPRequest. See the sample doing that

//create some string to get response into

string str = string.Empty;

HttpWebRequest req = HttpWebRequest.Create(url) as HttpWebRequest;

HttpWebResponse res = null;

//while you don’t OK keep trying

while (res == null || res.StatusCode != HttpStatusCode.OK)

{

                         try

                         {

//you are fine, do the rest

                         res = req.GetResponse() as HttpWebResponse;

                         using (Stream s = res.GetResponseStream())

                         {

                                                  using (StreamReader sr = new StreamReader(s))

                                                  {

                                                                           str = sr.ReadToEnd();

                                                                           sr.Close();

                                                  }

                         s.Close();

                         }

                         res.Close();

                         }

//You got an exception

                         catch (WebException e)

{

//If this exeption is not security one, you have nothing to do, the only thing is, maybe, check you network connection

                         if (e.Status == WebExceptionStatus.ProtocolError)

                                                  {

                                                                           res = e.Response as HttpWebResponse;

//Now check what the problem and if it’s security, threat it

                                                                           if (res.StatusCode == HttpStatusCode.Unauthorized)

                                                                           {

                                                                                                    string user = “”;

                                                                                                    string pwd = “”;

//pop you window and get information

                                                                                                    CredUIReturnCodes code = AskCredit(ref user, ref pwd);

                                                                                                    if (code == CredUIReturnCodes.NO_ERROR)

                                                                                                    {

//create new credential set and use it as required

                                                                                                                             CredentialCache creds = new CredentialCache();

                                                                                                                             creds.Add(url, “Basic”, new NetworkCredential(user,pwd));

                                                                                                    //creds.Add(url, “Digest”, new NetworkCredential(user, pwd));

                                                                                                    //creds.Add(url, “Negotiate”, CredentialCache.DefaultNetworkCredentials);

                                                                                                                             req.Credentials = creds;

                                                                                                    }

                                                                           }

                                                  }

                         }

}

Well done. Now you have an application, that pops Internet Explorer authentication window and optionally saves your passwords into security password store within the browser

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3 Responses to “How to use IE authentication dialog window programmatically”

  1. Mark Says:

    Can you do the same in Java?

  2. Donny Says:

    p.s. Sorry I forgot to mention… this would happen from IE itself.

    possible scenario:

    - Admin logs in

    - Goes to user list

    - Clicks Impersonate this user

    – from this point on admin is no longer admin since credentials used by IE for this browser window/session have been changed

  3. Donny Says:

    Would it be possible with a help of ActiveX or .NET control (loaded in IE) to open this dialog authenticate current user with different credentials?

    This is required for functionality such for administrator of some system to easily authenticate with some other users credentials without having to type them.

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