[FIXED HUDSON-1875] layout.jelly had a very error prone permission check that silentely passes when the "it" object is not an AccessControlled object.

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@10313 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/java/hudson/PluginManager.java

@@ -186,6 +186,8 @@ public final class PluginManager extends AbstractModelObject {
     }
 
     public void doProxyConfigure(@QueryParameter("proxy.server") String server, @QueryParameter("proxy.port") String port, StaplerResponse rsp) throws IOException {
+        Hudson.getInstance().checkPermission(Hudson.ADMINISTER);
+
         Hudson hudson = Hudson.getInstance();
         server = Util.fixEmptyAndTrim(server);
         if(server==null) {