/// <summary> /// This fuction calls CredUIParseUserName() to parse the user name. /// </summary> /// <param name="username">The username name to pass.</param> /// <param name="targetServer">The target for which username is being parsed.</param> /// <param name="user">The user part of the username.</param> /// <param name="domain">The domain part of the username.</param> /// <returns>Returns true if it successfully parsed the username.</returns> private static bool ParseUsername(string username, string targetServer, out string user, out string domain) { user = string.Empty; domain = string.Empty; if (string.IsNullOrEmpty(username)) { return(false); } bool successfullyParsed; StringBuilder strUser = new StringBuilder(Convert.ToInt32(ProxyNativeMethods.CREDUI_MAX_USERNAME_LENGTH)); StringBuilder strDomain = new StringBuilder(Convert.ToInt32(ProxyNativeMethods.CREDUI_MAX_DOMAIN_TARGET_LENGTH)); // Call the OS API to do the parsing. ProxyNativeMethods.CredUIReturnCodes result = ProxyNativeMethods.CredUIParseUserName(username, strUser, ProxyNativeMethods.CREDUI_MAX_USERNAME_LENGTH, strDomain, ProxyNativeMethods.CREDUI_MAX_DOMAIN_TARGET_LENGTH); successfullyParsed = (result == ProxyNativeMethods.CredUIReturnCodes.NO_ERROR); if (successfullyParsed) { user = strUser.ToString(); domain = strDomain.ToString(); // Remove the domain part if domain is same as target. This is to workaround // the COMPLETE_USERNAME flag which add the target to the user name as the // domain component. // Read comments in ShowOSCredentialDialog() for more details. if (!string.IsNullOrEmpty(domain) && string.Equals(domain, targetServer, StringComparison.OrdinalIgnoreCase)) { domain = string.Empty; } } return(successfullyParsed); }
//--------------------------------------------------------------------- // private methods //--------------------------------------------------------------------- /// <summary> /// This function calls the OS dialog to prompt user for credential. /// </summary> /// <param name="target"> /// The credential target. It is displayed in the prompt dialog and is /// used for credential storage. /// </param> /// <param name="hwdOwner">The parent for the dialog.</param> /// <param name="userName">The username supplied by the user.</param> /// <param name="password">The password supplied by the user.</param> /// <returns> /// DialogResult.OK = if Successfully prompted user for credentials. /// DialogResult.Cancel = if user cancelled the prompt dialog. /// </returns> private static DialogResult ShowOSCredentialDialog(string target, IntPtr hwdOwner, out string userName, out string password) { DialogResult retValue; userName = string.Empty; password = string.Empty; string titleFormat = SR.CredentialDialog_TitleFormat; string descriptionFormat = SR.CredentialDialog_DescriptionTextFormat; // Create the CREDUI_INFO structure. ProxyNativeMethods.CREDUI_INFO info = new ProxyNativeMethods.CREDUI_INFO(); info.pszCaptionText = string.Format(CultureInfo.CurrentUICulture, titleFormat, target); info.pszMessageText = string.Format(CultureInfo.CurrentUICulture, descriptionFormat, target); info.hwndParentCERParent = hwdOwner; info.hbmBannerCERHandle = IntPtr.Zero; info.cbSize = Marshal.SizeOf(info); // We do not use CREDUI_FLAGS_VALIDATE_USERNAME flag as it doesn't allow plain user // (one with no domain component). Instead we use CREDUI_FLAGS_COMPLETE_USERNAME. // It does some basic username validation (like doesnt allow two "\" in the user name. // It does adds the target to the username. For example, if user entered "foo" for // taget "bar.com", it will return username as "bar.com\foo". We trim out bar.com // while parsing the username. User can input "*****@*****.**" as workaround to provide // "bar.com\foo" as the username. // We specify CRED_TYPE_SERVER_CREDENTIAL flag as the stored credentials appear in the // "Control Panel->Stored Usernames and Password". It is how IE stores and retrieve // credentials. By using the CRED_TYPE_SERVER_CREDENTIAL flag allows IE and VS to // share credentials. // We dont specify the CREDUI_FLAGS_EXPECT_CONFIRMATION as the VS proxy service consumers // dont call back into the service to confirm that the call succeeded. ProxyNativeMethods.CREDUI_FLAGS flags = ProxyNativeMethods.CREDUI_FLAGS.SERVER_CREDENTIAL | ProxyNativeMethods.CREDUI_FLAGS.SHOW_SAVE_CHECK_BOX | ProxyNativeMethods.CREDUI_FLAGS.COMPLETE_USERNAME | ProxyNativeMethods.CREDUI_FLAGS.EXCLUDE_CERTIFICATES; StringBuilder user = new StringBuilder(Convert.ToInt32(ProxyNativeMethods.CREDUI_MAX_USERNAME_LENGTH)); StringBuilder pwd = new StringBuilder(Convert.ToInt32(ProxyNativeMethods.CREDUI_MAX_PASSWORD_LENGTH)); int saveCredentials = 0; // Ensures that CredUPPromptForCredentials results in a prompt. int netError = ProxyNativeMethods.ERROR_LOGON_FAILURE; // Call the OS API to prompt for credentials. ProxyNativeMethods.CredUIReturnCodes result = ProxyNativeMethods.CredUIPromptForCredentials( info, target, IntPtr.Zero, netError, user, ProxyNativeMethods.CREDUI_MAX_USERNAME_LENGTH, pwd, ProxyNativeMethods.CREDUI_MAX_PASSWORD_LENGTH, ref saveCredentials, flags); if (result == ProxyNativeMethods.CredUIReturnCodes.NO_ERROR) { userName = user.ToString(); password = pwd.ToString(); try { if (Convert.ToBoolean(saveCredentials)) { // Try reading the credentials back to ensure that we can read the stored credentials. If // the CredUIPromptForCredentials() function is not able successfully call CredGetTargetInfo(), // it will store credentials with credential type as DOMAIN_PASSWORD. For DOMAIN_PASSWORD // credential type we can only retrive the user name. As a workaround, we store the credentials // as credential type as GENERIC. bool successfullyReadCredentials = ReadOSCredentials(target, out string storedUserName, out string storedPassword); if (!successfullyReadCredentials || !string.Equals(userName, storedUserName, StringComparison.Ordinal) || !string.Equals(password, storedPassword, StringComparison.Ordinal)) { // We are not able to retrieve the credentials. Try storing them as GENERIC credetails. // Create the NativeCredential object. ProxyNativeMethods.NativeCredential customCredential = new ProxyNativeMethods.NativeCredential(); customCredential.userName = userName; customCredential.type = ProxyNativeMethods.CRED_TYPE_GENERIC; customCredential.targetName = CreateCustomTarget(target); // Store credentials across sessions. customCredential.persist = (uint)ProxyNativeMethods.CRED_PERSIST.LOCAL_MACHINE; if (!string.IsNullOrEmpty(password)) { customCredential.credentialBlobSize = (uint)Marshal.SystemDefaultCharSize * ((uint)password.Length); customCredential.credentialBlob = Marshal.StringToCoTaskMemAuto(password); } try { ProxyNativeMethods.CredWrite(ref customCredential, 0); } finally { if (customCredential.credentialBlob != IntPtr.Zero) { Marshal.FreeCoTaskMem(customCredential.credentialBlob); } } } } } catch { // Ignore that failure to read back the credentials. We still have // username and password to use in the current session. } retValue = DialogResult.OK; } else if (result == ProxyNativeMethods.CredUIReturnCodes.ERROR_CANCELLED) { retValue = DialogResult.Cancel; } else { Debug.Fail("CredUIPromptForCredentials failed with result = " + result.ToString()); retValue = DialogResult.Cancel; } info.Dispose(); return(retValue); }