1 /*
   2  * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 import java.lang.reflect.Constructor;
  25 import java.lang.reflect.Method;
  26 
  27 /**
  28  * Launched by PermitIllegalAccess to attempt illegal access.
  29  */
  30 
  31 public class AttemptAccess {
  32 
  33     public static void main(String[] args) throws Exception {
  34         String action = args[0];
  35         int count = Integer.parseInt(args[1]);
  36 
  37         for (int i=0; i<count; i++) {
  38             switch (action) {
  39                 case "access":
  40                     tryAccess();
  41                     break;
  42                 case "setAccessible":
  43                     trySetAccessible();
  44                     break;
  45                 case "trySetAccessible":
  46                     tryTrySetAccessible();
  47                     break;
  48             }
  49         }
  50     }
  51 
  52     static void tryAccess() throws Exception {
  53         Class<?> clazz = Class.forName("sun.security.x509.X500Name");
  54         Constructor<?> ctor = clazz.getConstructor(String.class);
  55         Object name = ctor.newInstance("CN=user");
  56     }
  57 
  58     static void trySetAccessible() throws Exception {
  59         Method find = ClassLoader.class.getDeclaredMethod("findClass", String.class);
  60         find.setAccessible(true);
  61     }
  62 
  63     static void tryTrySetAccessible() throws Exception {
  64         Method find = ClassLoader.class.getDeclaredMethod("findClass", String.class);
  65         find.trySetAccessible();
  66     }
  67 
  68 }