de.unkrig.commons.lang.security

Class Sandbox

java.lang.Object

de.unkrig.commons.lang.security.Sandbox

public final class Sandbox
extends Object

This class establishes a security manager that confines the permissions for code executed through specific classes, which may be specified by class, class name and/or class loader.

To 'execute through a class' means that the execution stack includes the class. E.g., if a method of class A invokes a method of class B, which then invokes a method of class C, and all three classes were previously confined, then for all actions that are executed by class C the intersection of the three Permissions apply.

Once the permissions for a class, class name or class loader are confined, they cannot be changed; this prevents any attempts (e.g. of a confined class itself) to release the confinement.

Code example:

  Runnable unprivileged = new Runnable() {
      public void run() {
          System.getProperty("user.dir");
      }
  };

  // Run without confinement.
  unprivileged.run(); // Works fine.

  // Set the most strict permissions.
  Sandbox.confine(unprivileged.getClass(), new Permissions());
  unprivileged.run(); // Throws a SecurityException.

  // Attempt to change the permissions.
  {
      Permissions permissions = new Permissions();
      permissions.add(new AllPermission());
      Sandbox.confine(unprivileged.getClass(), permissions); // Throws a SecurityException.
  }
  unprivileged.run();
 

See Also:

ORACLE: Java Essentials: The Security Manager

Method Summary

Modifier and Type	Method and Description
static void	confine(Class<?> clasS, AccessControlContext accessControlContext) All future actions that are executed through the given clasS will be checked against the given accessControlContext.
static void	confine(Class<?> clasS, Permissions permissions) All future actions that are executed through the given clasS will be checked against the given permissions.
static void	confine(Class<?> clasS, ProtectionDomain protectionDomain) All future actions that are executed through the given clasS will be checked against the given protectionDomain.
static void	confine(ClassLoader classLoader, AccessControlContext accessControlContext) All future actions that are executed through classes that were loaded through the given classLoader will be checked against the given accessControlContext.
static void	confine(ClassLoader classLoader, Permissions permissions) All future actions that are executed through classes that were loaded through the given classLoader will be checked against the given permissions.
static void	confine(ClassLoader classLoader, ProtectionDomain protectionDomain) All future actions that are executed through classes that were loaded through the given classLoader will be checked against the given protectionDomain.
static void	confine(String className, AccessControlContext accessControlContext) All future actions that are executed through the named class will be checked against the given accessControlContext.
static void	confine(String className, Permissions permissions) All future actions that are executed through the named class will be checked against the given permissions.
static void	confine(String className, ProtectionDomain protectionDomain) All future actions that are executed through the named class will be checked against the given protectionDomain.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

confine

public static void confine(Class<?> clasS,
                           AccessControlContext accessControlContext)

All future actions that are executed through the given clasS will be checked against the given accessControlContext.

Throws:

SecurityException - Permissions are already confined for the clasS

confine

public static void confine(Class<?> clasS,
                           ProtectionDomain protectionDomain)

All future actions that are executed through the given clasS will be checked against the given protectionDomain.

Throws:

SecurityException - Permissions are already confined for the clasS

confine

public static void confine(Class<?> clasS,
                           Permissions permissions)

All future actions that are executed through the given clasS will be checked against the given permissions.

Throws:

SecurityException - Permissions are already confined for the clasS

confine

public static void confine(String className,
                           AccessControlContext accessControlContext)

All future actions that are executed through the named class will be checked against the given accessControlContext.

Throws:

SecurityException - Permissions are already confined for the className

confine

public static void confine(String className,
                           ProtectionDomain protectionDomain)

All future actions that are executed through the named class will be checked against the given protectionDomain.

Throws:

SecurityException - Permissions are already confined for the className

confine

public static void confine(String className,
                           Permissions permissions)

All future actions that are executed through the named class will be checked against the given permissions.

Throws:

SecurityException - Permissions are already confined for the className

confine

public static void confine(ClassLoader classLoader,
                           AccessControlContext accessControlContext)

All future actions that are executed through classes that were loaded through the given classLoader will be checked against the given accessControlContext.

Throws:

SecurityException - Permissions are already confined for the classLoader

confine

public static void confine(ClassLoader classLoader,
                           ProtectionDomain protectionDomain)

All future actions that are executed through classes that were loaded through the given classLoader will be checked against the given protectionDomain.

Throws:

SecurityException - Permissions are already confined for the classLoader

confine

public static void confine(ClassLoader classLoader,
                           Permissions permissions)

All future actions that are executed through classes that were loaded through the given classLoader will be checked against the given permissions.

Throws:

SecurityException - Permissions are already confined for the classLoader