org.mozilla.javascript

Class SecurityController

public abstract class SecurityController extends Object

This class describes the support needed to implement security.

Three main pieces of functionality are required to implement security for JavaScript. First, it must be possible to define classes with an associated security domain. (This security domain may be any object incorporating notion of access restrictions that has meaning to an embedding; for a client-side JavaScript embedding this would typically be java.security.ProtectionDomain or similar object depending on an origin URL and/or a digital certificate.) Next it must be possible to get a security domain object that allows a particular action only if all security domains associated with code on the current Java stack allows it. And finally, it must be possible to execute script code with associated security domain injected into Java stack.

These three pieces of functionality are encapsulated in the SecurityController class.

Since: 1.5 Release 4

See Also: setSecurityController java.lang.ClassLoader

Method Summary
ObjectcallWithDomain(Object securityDomain, Context cx, Callable callable, Scriptable scope, Scriptable thisObj, Object[] args)
Call {@link Callable#call(Context cx, Scriptable scope, Scriptable thisObj, Object[] args)} of callable under restricted security domain where an action is allowed only if it is allowed according to the Java stack on the moment of the execWithDomain call and securityDomain.
abstract GeneratedClassLoadercreateClassLoader(ClassLoader parentLoader, Object securityDomain)
Get class loader-like object that can be used to define classes with the given security context.
static GeneratedClassLoadercreateLoader(ClassLoader parent, Object staticDomain)
Create {@link GeneratedClassLoader} with restrictions imposed by staticDomain and all current stack frames.
ObjectexecWithDomain(Context cx, Scriptable scope, Script script, Object securityDomain)
abstract ObjectgetDynamicSecurityDomain(Object securityDomain)
Get dynamic security domain that allows an action only if it is allowed by the current Java stack and securityDomain.
static booleanhasGlobal()
Check if global {@link SecurityController} was already installed.
static voidinitGlobal(SecurityController controller)
Initialize global controller that will be used for all security-related operations.

Method Detail

callWithDomain

public Object callWithDomain(Object securityDomain, Context cx, Callable callable, Scriptable scope, Scriptable thisObj, Object[] args)
Call {@link Callable#call(Context cx, Scriptable scope, Scriptable thisObj, Object[] args)} of callable under restricted security domain where an action is allowed only if it is allowed according to the Java stack on the moment of the execWithDomain call and securityDomain. Any call to {@link #getDynamicSecurityDomain(Object)} during execution of callable.call(cx, scope, thisObj, args) should return a domain incorporate restrictions imposed by securityDomain and Java stack on the moment of callWithDomain invocation.

The method should always be overridden, it is not declared abstract for compatibility reasons.

createClassLoader

public abstract GeneratedClassLoader createClassLoader(ClassLoader parentLoader, Object securityDomain)
Get class loader-like object that can be used to define classes with the given security context.

Parameters: parentLoader parent class loader to delegate search for classes not defined by the class loader itself securityDomain some object specifying the security context of the code that is defined by the returned class loader.

createLoader

public static GeneratedClassLoader createLoader(ClassLoader parent, Object staticDomain)
Create {@link GeneratedClassLoader} with restrictions imposed by staticDomain and all current stack frames. The method uses the SecurityController instance associated with the current {@link Context} to construct proper dynamic domain and create corresponding class loader. If no SecurityController is associated with the current {@link Context} , the method calls {@link Context#createClassLoader(ClassLoader parent)}.

Parameters: parent parent class loader. If null, {@link Context#getApplicationClassLoader()} will be used. staticDomain static security domain.

execWithDomain

public Object execWithDomain(Context cx, Scriptable scope, Script script, Object securityDomain)

Deprecated: The application should not override this method and instead override {@link #callWithDomain(Object securityDomain, Context cx, Callable callable, Scriptable scope, Scriptable thisObj, Object[] args)}.

getDynamicSecurityDomain

public abstract Object getDynamicSecurityDomain(Object securityDomain)
Get dynamic security domain that allows an action only if it is allowed by the current Java stack and securityDomain. If securityDomain is null, return domain representing permissions allowed by the current stack.

hasGlobal

public static boolean hasGlobal()
Check if global {@link SecurityController} was already installed.

See Also: SecurityController

initGlobal

public static void initGlobal(SecurityController controller)
Initialize global controller that will be used for all security-related operations. The global controller takes precedence over already installed {@link Context}-specific controllers and cause any subsequent call to {@link Context#setSecurityController(SecurityController)} to throw an exception.

The method can only be called once.

See Also: hasGlobal