org.codehaus.gmaven.plugin.util.NoExitSecurityManager Maven / Gradle / Ivy

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/*
 * Copyright (c) 2007-2013, the original author or authors.
 *
 * This program is licensed to you under the Apache License Version 2.0,
 * and you may not use this file except in compliance with the Apache License Version 2.0.
 * You may obtain a copy of the Apache License Version 2.0 at http://www.apache.org/licenses/LICENSE-2.0.
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the Apache License Version 2.0 is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Apache License Version 2.0 for the specific language governing permissions and limitations there under.
 */
package org.codehaus.gmaven.plugin.util;

import java.security.Permission;

import javax.annotation.Nullable;

/**
 * Custom security manager to {@link System#exit} (and related) from being used.
 *
 * @since 2.0
 */
public class NoExitSecurityManager
    extends SecurityManager
{
  private final SecurityManager parent;

  public NoExitSecurityManager(final @Nullable SecurityManager parent) {
    this.parent = parent;
  }

  // NOTE: Do not log/print anything from this implementation, as it can result in stack overflow
  // NOTE: due to console/shell installing system out/err interceptors.

  private void deny() {
    throw new SecurityException("Use of System.exit() is forbidden");
  }

  @Override
  public void checkPermission(final Permission perm) {
    if (perm == null) {
      return;
    }
    String name = perm.getName();
    if (name != null && name.startsWith("exitVM")) {
      deny();
    }
    if (parent != null) {
      parent.checkPermission(perm);
    }
  }

  /**
   * Always throws {@link SecurityException}.
   */
  @Override
  public void checkExit(final int code) {
    deny();
  }
}