diff --git a/webui/.htaccess b/webui/.htaccess
index 7970eeef..934620c0 100644
--- a/webui/.htaccess
+++ b/webui/.htaccess
@@ -14,3 +14,14 @@ RewriteRule ^login.php /index.php?route=login/login [L]
 RewriteRule ^logout.php /index.php?route=login/logout [L]
 RewriteRule ^google.php /index.php?route=login/google [QSA,L]
 
+<IfModule auth_ntlm_winbind_module>
+   <FilesMatch "sso\.php$">
+      AuthName "piler NTLM authentication"
+      NTLMAuth on
+      NTLMAuthHelper "/usr/bin/ntlm_auth --helper-protocol=squid-2.5-ntlmssp"
+      NTLMBasicAuthoritative on
+      AuthType NTLM
+      require valid-user
+   </FilesMatch>
+</IfModule>
+
diff --git a/webui/controller/login/sso.php b/webui/controller/login/sso.php
new file mode 100644
index 00000000..3ec1dba9
--- /dev/null
+++ b/webui/controller/login/sso.php
@@ -0,0 +1,35 @@
+<?php
+
+
+class ControllerLoginSSO extends Controller {
+   private $error = array();
+
+   public function index(){
+
+      $this->id = "content";
+      $this->template = "login/login.tpl";
+      $this->layout = "common/layout";
+
+
+      $request = Registry::get('request');
+
+      $db = Registry::get('db');
+
+      $this->load->model('user/auth');
+      $this->load->model('user/user');
+      $this->load->model('user/prefs');
+      $this->load->model('folder/folder');
+
+      $this->document->title = $this->data['text_login'];
+
+      if($this->model_user_auth->check_ntlm_auth() == 1) {
+         header("Location: " . SITE_URL . "search.php");
+         exit;
+      }
+
+      die("permission denied");
+   }
+
+}
+
+?>
diff --git a/webui/model/user/auth.php b/webui/model/user/auth.php
index ead707c2..180fabe0 100644
--- a/webui/model/user/auth.php
+++ b/webui/model/user/auth.php
@@ -69,6 +69,34 @@ class ModelUserAuth extends Model {
    }
 
 
+   public function check_ntlm_auth() {
+      if(!isset($_SERVER['REMOTE_USER'])) { return 0; }
+
+      $u = explode("\\", $_SERVER['REMOTE_USER']);
+
+      if(!isset($u[1])) { return 0; }
+
+      $query = $this->db->query("SELECT " . TABLE_USER . ".username, " . TABLE_USER . ".uid, " . TABLE_USER . ".realname, " . TABLE_USER . ".dn, " . TABLE_USER . ".isadmin, " . TABLE_USER . ".domain FROM " . TABLE_USER . " WHERE " . TABLE_USER . ".samaccountname=?", array($u[1]));
+
+      if($query->num_rows == 1) {
+         $_SESSION['username'] = $query->row['username'];
+         $_SESSION['uid'] = $query->row['uid'];
+         $_SESSION['admin_user'] = $query->row['isadmin'];
+         $_SESSION['email'] = $username;
+         $_SESSION['domain'] = $query->row['domain'];
+         $_SESSION['realname'] = $query->row['realname'];
+
+         $_SESSION['emails'] = $this->model_user_user->get_users_all_email_addresses($query->row['uid']);
+         $_SESSION['folders'] = $this->model_folder_folder->get_all_folder_ids($query->row['uid']);
+         $_SESSION['extra_folders'] = $this->model_folder_folder->get_all_extra_folder_ids($query->row['uid']);
+
+         return 1;
+      }
+
+      return 0; 
+   }
+
+
    public function change_password($username = '', $password = '') {
       if($username == "" || $password == ""){ return 0; }
 
diff --git a/webui/sso.php b/webui/sso.php
new file mode 100644
index 00000000..71e16f87
--- /dev/null
+++ b/webui/sso.php
@@ -0,0 +1,47 @@
+<?php
+
+function go_to_setup() {
+   Header("Location: setup/setup.php");
+   exit;
+}
+
+$stat = stat("config.php") or go_to_setup();
+if($stat[7] < 15){ go_to_setup(); }
+
+
+require_once("config.php");
+
+require(DIR_SYSTEM . "/startup.php");
+
+
+$request = new Request();
+Registry::set("request", $request);
+
+
+session_start();
+
+Registry::set('document', new Document());
+
+
+$loader = new Loader();
+Registry::set('load', $loader);
+
+
+$language = new Language();
+Registry::set('language', $language);
+
+
+$db = new DB(DB_DRIVER, DB_HOSTNAME, DB_USERNAME, DB_PASSWORD, DB_DATABASE, DB_PREFIX);
+Registry::set('DB_DATABASE', DB_DATABASE);
+
+Registry::set('db', $db);
+
+Registry::set('DB_DRIVER', DB_DRIVER);
+
+$action = new Router('login/sso');
+
+$controller = new Front();
+$controller->dispatch($action, new Router('common/not_found'));
+
+
+?>