1 files changed, 8 insertions, 0 deletions
diff --git a/install.php b/install.php
index 649e608bc..e66ddff86 100644
--- a/install.php
+++ b/install.php
@@ -20,6 +20,14 @@ define('MAINTENANCE_MODE', 'install');
  *   The installation phase we should proceed to.
  */
 function install_main() {
+  // The user agent header is used to pass a database prefix in the request when
+  // running tests.  However, for security reasons, it is imperative that no
+  // installation be permitted using such a prefix.
+  if (preg_match("/^simpletest\d+$/", $_SERVER['HTTP_USER_AGENT'])) {
+    header('HTTP/1.1 403 Forbidden');
+    exit;
+  }  
+    
   require_once './includes/bootstrap.inc';
   drupal_bootstrap(DRUPAL_BOOTSTRAP_CONFIGURATION);