diff --git a/common/rfb/UserPasswdGetter.h b/common/rfb/UserPasswdGetter.h
new file mode 100644
index 0000000..18b0bae
--- /dev/null
+++ b/common/rfb/UserPasswdGetter.h
@@ -0,0 +1,30 @@
+/* Copyright (C) 2002-2005 RealVNC Ltd.  All Rights Reserved.
+ * 
+ * This is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ * 
+ * This software is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this software; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,
+ * USA.
+ */
+#ifndef __RFB_USERPASSWDGETTER_H__
+#define __RFB_USERPASSWDGETTER_H__
+namespace rfb {
+  class UserPasswdGetter {
+  public:
+    // getUserPasswd gets the username and password.  This might involve a
+    // dialog, getpass(), etc.  The user buffer pointer can be null, in which
+    // case no user name will be retrieved.  The caller MUST delete [] the
+    // result(s).
+    virtual void getUserPasswd(char** user, char** password)=0;
+  };
+}
+#endif