Allow admins to change the CSP policy in the config file

config/config.sample.php

@@ -104,6 +104,9 @@ $CONFIG = array(
 /* Lifetime of the remember login cookie, default is 15 days */
 "remember_login_cookie_lifetime" => 60*60*24*15,
 
+/* Custom CSP policy, changing this will overwrite the standard policy */
+"custom_csp_policy" => "default-src \'self\'; script-src \'self\' \'unsafe-eval\'; style-src \'self\' \'unsafe-inline\'; frame-src *",
+
 /* The directory where the user data is stored, default to data in the owncloud
  * directory. The sqlite database is also stored here, when sqlite is used.
  */

lib/template.php

@@ -191,7 +191,7 @@ class OC_Template{
 		header('X-Content-Type-Options: nosniff'); // Disable sniffing the content type for IE
 
 		// Content Security Policy
-		$policy = 'default-src \'self\'; script-src \'self\' \'unsafe-eval\'; style-src \'self\' \'unsafe-inline\'; frame-src *';
+		$policy = OC_Config::getValue('custom_csp_policy',  'default-src \'self\'; script-src \'self\' \'unsafe-eval\'; style-src \'self\' \'unsafe-inline\'; frame-src *');
 		header('Content-Security-Policy:'.$policy); // Standard
 		header('X-WebKit-CSP:'.$policy); // Older webkit browsers
 		header('X-Content-Security-Policy:'.$policy); // Mozilla + Internet Explorer