diff --git a/.gitignore b/.gitignore
index 97f0d215..a4c3ecb8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -13,3 +13,5 @@ test.html
 *.ipr
 *.iws
 
+# vim
+*.swp
diff --git a/README.md b/README.md
index cf2e1bc2..640bcbca 100644
--- a/README.md
+++ b/README.md
@@ -1,12 +1,14 @@
 Pi-hole Admin Dashboard
 ============
+[![Join the chat at https://gitter.im/pi-hole/AdminLTE](https://badges.gitter.im/pi-hole/AdminLTE.svg)](https://gitter.im/pi-hole/AdminLTE?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
+
 [![Donate](https://www.paypalobjects.com/en_US/i/btn/btn_donateCC_LG.gif "AdminLTE Presentation")](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=3J2L3Z4DHW9UY "Donate")
 
 Using **[AdminLTE](https://almsaeedstudio.com)**, this project will create a Web interface for the ad-blocking Pi-hole: **a black hole for Internet advertisements**.
 
 From this interface, you will be able to see stats on how well your Pi-hole is performing.  You will also be able to update the lists used to block ads.
 
-![Pi-hole Web interface](http://i.imgur.com/FweAo36.png)
+![Pi-hole Web interface](http://i.imgur.com/5lLAUGo.png)
 ![Fully responsive](http://i.imgur.com/fHuWR6E.png)
 
 ## API
diff --git a/php/add.php b/php/add.php
index 0a072722..ae7da1a1 100644
--- a/php/add.php
+++ b/php/add.php
@@ -1,23 +1,5 @@
 <?php
-if(!isset($_POST['domain'], $_POST['list'], $_POST['token']))
-    die("Missing POST variables");
-
-// Check CORS
-if(isset($_SERVER['HTTP_ORIGIN'])) {
-    if ($_SERVER['HTTP_ORIGIN'] == "http://pi.hole" ||
-        $_SERVER['HTTP_ORIGIN'] == "http://${_SERVER['SERVER_ADDR']}" ||
-        $_SERVER['HTTP_ORIGIN'] == "http://localhost"
-    )
-        header("Access-Control-Allow-Origin: ${_SERVER['HTTP_ORIGIN']}");
-    else
-        die("Failed CORS");
-}
-// Otherwise probably same origin... out of the scope of CORS
-
-// Check CSRF token
-session_start();
-if(!hash_equals($_SESSION['token'], $_POST['token']))
-    die("Wrong token");
+require('auth.php');
 
 switch($_POST['list']) {
     case "white":
@@ -27,3 +9,5 @@ switch($_POST['list']) {
         echo exec("sudo pihole -b -q ${_POST['domain']}");
         break;
 }
+
+?>
diff --git a/php/auth.php b/php/auth.php
new file mode 100644
index 00000000..1447296f
--- /dev/null
+++ b/php/auth.php
@@ -0,0 +1,52 @@
+<?php
+$ERRORLOG = getenv('PHP_ERROR_LOG');
+if (empty($ERRORLOG)) {
+    $ERRORLOG = '/var/log/lighttpd/error.log';
+}
+
+function pi_log($message) {
+    error_log(date('Y-m-d H:i:s') . ': ' . $message . "\n", 3, $GLOBALS['ERRORLOG']);
+}
+
+function log_and_die($message) {
+    pi_log($message);
+    die($message);
+}
+
+if(!isset($_POST['domain'], $_POST['list'], $_POST['token'])) {
+    log_and_die("Missing POST variables");
+}
+
+$AUTHORIZED_HOSTNAMES = [
+    'http://' . $_SERVER['SERVER_ADDR'],
+    'http://pi.hole',
+    'http://localhost'
+];
+
+# Allow user set virtual hostnames
+$virtual_host = getenv('VIRTUAL_HOST');
+if (! empty($virtual_host))
+    array_push($AUTHORIZED_HOSTNAMES, 'http://' . $virtual_host);
+
+// Check CORS
+if(isset($_SERVER['HTTP_ORIGIN'])) {
+    if(in_array($_SERVER['HTTP_ORIGIN'], $AUTHORIZED_HOSTNAMES)) {
+        $CORS_ALLOW_ORIGIN = $_SERVER['HTTP_ORIGIN'];
+    } else {
+        log_and_die("Failed CORS: " . $_SERVER['HTTP_ORIGIN'] .' vs '. join(',', $AUTHORIZED_HOSTNAMES));
+    }
+    header("Access-Control-Allow-Origin: $CORS_ALLOW_ORIGIN");
+} else {
+    pi_log("CORS skipped, unknown HTTP_ORIGIN");
+    //pi_log("CORS allowed: " . join(',', $AUTHORIZED_HOSTNAMES));
+}
+
+// Otherwise probably same origin... out of the scope of CORS
+session_start();
+
+// Check CSRF token
+if(!isset($_SESSION['token'], $_POST['token']) || !hash_equals($_SESSION['token'], $_POST['token'])) {
+    log_and_die("Wrong token");
+}
+
+?>
diff --git a/php/sub.php b/php/sub.php
index aa13d4c1..e4f02918 100644
--- a/php/sub.php
+++ b/php/sub.php
@@ -1,23 +1,5 @@
 <?php
-if(!isset($_POST['domain'], $_POST['list'], $_POST['token']))
-    die("Missing POST variables");
-
-// Check CORS
-if(isset($_SERVER['HTTP_ORIGIN'])) {
-    if ($_SERVER['HTTP_ORIGIN'] == "http://pi.hole" ||
-        $_SERVER['HTTP_ORIGIN'] == "http://${_SERVER['SERVER_ADDR']}" ||
-        $_SERVER['HTTP_ORIGIN'] == "http://localhost"
-    )
-        header("Access-Control-Allow-Origin: ${_SERVER['HTTP_ORIGIN']}");
-    else
-        die("Failed CORS");
-}
-// Otherwise probably same origin... out of the scope of CORS
-
-// Check CSRF token
-session_start();
-if(!hash_equals($_SESSION['token'], $_POST['token']))
-    die("Wrong token");
+require('auth.php');
 
 switch($_POST['list']) {
     case "white":
@@ -27,3 +9,5 @@ switch($_POST['list']) {
         exec("sudo pihole -b -q -d ${_POST['domain']}");
         break;
 }
+
+?>