Prompt the user for a password if none is configured in the VPN profile

src/frontends/android/res/layout/login_dialog.xml

@@ -0,0 +1,51 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+    Copyright (C) 2012 Tobias Brunner
+    Copyright (C) 2012 Giuliano Grassi
+    Copyright (C) 2012 Ralf Sager
+    Hochschule fuer Technik Rapperswil
+
+    This program 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.  See <http://www.fsf.org/copyleft/gpl.txt>.
+
+    This program 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.
+-->
+<LinearLayout
+    android:layout_height="match_parent"
+    android:layout_width="match_parent"
+    android:orientation="vertical"
+    android:padding="5dp"
+    xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <TextView
+        android:layout_height="wrap_content"
+        android:layout_width="wrap_content"
+        android:text="@string/profile_username_label"
+        android:textStyle="bold" />
+
+    <EditText
+        android:layout_height="wrap_content"
+        android:layout_width="match_parent"
+        android:id="@+id/username"
+        android:enabled="false"
+        android:inputType="none" />
+
+    <TextView
+        android:layout_height="wrap_content"
+        android:layout_width="wrap_content"
+        android:text="@string/profile_password_label"
+        android:textStyle="bold" />
+
+    <EditText
+        android:layout_height="wrap_content"
+        android:layout_width="match_parent"
+        android:id="@+id/password"
+        android:inputType="textPassword|textNoSuggestions"
+        android:singleLine="true" />
+
+</LinearLayout>

src/frontends/android/res/values/strings.xml

@@ -50,4 +50,8 @@
     <string name="alert_text_nocertfound_title">No CA certificate selected</string>
     <string name="alert_text_nocertfound">Please select one or activate <i>Select automatically</i></string>
 
+    <!-- Dialogs -->
+    <string name="login_title">Enter password to connect</string>
+    <string name="login_confirm">Connect</string>
+
 </resources>