/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package java.lang;
// BEGIN android-added
import dalvik.system.VMStack;
// END android-added
import java.io.File;
import java.io.FileDescriptor;
import java.io.FilePermission;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Member;
import java.net.InetAddress;
import java.net.SocketPermission;
import java.security.AccessControlContext;
import java.security.AccessController;
import java.security.AllPermission;
import java.security.Permission;
import java.security.Security;
import java.security.SecurityPermission;
import java.util.PropertyPermission;
import java.util.StringTokenizer;
import org.apache.harmony.luni.util.PriviAction;
/**
* Provides security verification facilities for applications. {@code
* SecurityManager} contains a set of {@code checkXXX} methods which determine
* if it is safe to perform a specific operation such as establishing network
* connections, modifying files, and many more. In general, these methods simply
* return if they allow the application to perform the operation; if an
* operation is not allowed, then they throw a {@link SecurityException}. The
* only exception is {@link #checkTopLevelWindow(Object)}, which returns a
* boolean to indicate permission.
*
* @since Android 1.0
*/
public class SecurityManager {
private static final PropertyPermission READ_WRITE_ALL_PROPERTIES_PERMISSION = new PropertyPermission(
"*", "read,write"); //$NON-NLS-1$ //$NON-NLS-2$
private static final String PKG_ACC_KEY = "package.access"; //$NON-NLS-1$
private static final String PKG_DEF_KEY = "package.definition"; //$NON-NLS-1$
/**
* Flag to indicate whether a security check is in progress.
*
* @deprecated Use {@link #checkPermission}
* @since Android 1.0
*/
@Deprecated
protected boolean inCheck;
/**
* Constructs a new {@code SecurityManager} instance.
* <p>
* The {@code RuntimePermission("createSecurityManager")} is checked if a
* security manager is installed.
* </p>
*
* @since Android 1.0
*/
public SecurityManager() {
SecurityManager security = System.getSecurityManager();
if (security != null) {
security
.checkPermission(RuntimePermission.permissionToCreateSecurityManager);
}
Class<?> type = Security.class; // initialize Security properties
if (type == null) {
throw new AssertionError();
}
}
/**
* Checks whether the calling thread is allowed to accept socket
* connections.
*
* @param host
* the address of the host that attempts to connect.
* @param port
* the port number to check.
* @throws NullPointerException
* if {@code host} is {@code null}.
* @throws SecurityException
* if the calling thread is not allowed to accept socket
* connections from {@code host} through {@code port}.
* @since Android 1.0
*/
public void checkAccept(String host, int port) {
if (host == null) {
throw new NullPointerException();
}
checkPermission(new SocketPermission(host + ':' + port, "accept")); //$NON-NLS-1$
}
/**
* Checks whether the calling thread is allowed to modify the specified
* thread.
*
* @param thread
* the thread to access.
* @throws SecurityException
* if the calling thread is not allowed to access {@code thread}.
* @since Android 1.0
*/
public void checkAccess(Thread thread) {
// Only worry about system threads. Dead threads have a null group.
ThreadGroup group = thread.getThreadGroup();
if ((group != null) && (group.parent == null)) {
checkPermission(RuntimePermission.permissionToModifyThread);
}
}
/**
* Checks whether the calling thread is allowed to modify the specified
* thread group.
*
* @param group
* the thread group to access.
* @throws NullPointerException
* if {@code group} is {@code null}.
* @throws SecurityException
* if the calling thread is not allowed to access {@code group}.
* @since Android 1.0
*/
public void checkAccess(ThreadGroup group) {
// Only worry about system threads.
if (group == null) {
throw new NullPointerException();
}
if (group.parent == null) {
checkPermission(RuntimePermission.permissionToModifyThreadGroup);
}
}
/**
* Checks whether the calling thread is allowed to establish socket
* connections. A -1 port indicates the caller is trying to resolve the
* hostname.
*
* @param host
* the address of the host to connect to.
* @param port
* the port number to check, or -1 for resolve.
* @throws NullPointerException
* if {@code host} is {@code null}.
* @throws SecurityException
* if the calling thread is not allowed to connect to {@code
* host} through {@code port}.
* @since Android 1.0
*/
public void checkConnect(String host, int port) {
if (host == null) {
throw new NullPointerException();
}
if (port > 0) {
checkPermission(new SocketPermission(host + ':' + port, "connect")); //$NON-NLS-1$
} else {
checkPermission(new SocketPermission(host, "resolve")); //$NON-NLS-1$
}
}
/**
* Checks whether the specified security context is allowed to establish
* socket connections. A -1 port indicates the caller is trying to resolve
* the hostname.
*
* @param host
* the address of the host to connect to.
* @param port
* the port number to check, or -1 for resolve.
* @param context
* the security context to use for the check.
* @throws NullPointerException
* if {@code host} is {@code null}.
* @throws SecurityException
* if {@code context} is not allowed to connect to {@code host}
* through {@code port}.
* @since Android 1.0
*/
public void checkConnect(String host, int port, Object context) {
// BEGIN android-added
if (host == null) {
throw new NullPointerException();
}
// END android-added
if (port > 0) {
checkPermission(new SocketPermission(host + ':' + port, "connect"), //$NON-NLS-1$
context);
} else {
checkPermission(new SocketPermission(host, "resolve"), context); //$NON-NLS-1$
}
}
/**
* Checks whether the calling thread is allowed to create a class loader.
*
* @throws SecurityException
* if the calling thread is not allowed to create a class
* loader.
* @since Android 1.0
*/
public void checkCreateClassLoader() {
checkPermission(RuntimePermission.permissionToCreateClassLoader);
}
/**
* Checks whether the calling thread is allowed to delete the file with the
* specified name, which should be passed in canonical form.
*
* @param file
* the name of the file to delete.
* @throws SecurityException
* if the calling thread is not allowed to delete {@code file}.
* @since Android 1.0
*/
public void checkDelete(String file) {
checkPermission(new FilePermission(file, "delete")); //$NON-NLS-1$
}
/**
* Checks whether the calling thread is allowed to execute the specified
* platform specific command.
*
* @param cmd
* the command line to execute.
* @throws SecurityException
* if the calling thread is not allowed to execute {@code cmd}.
* @since Android 1.0
*/
public void checkExec(String cmd) {
checkPermission(new FilePermission(new File(cmd).isAbsolute() ? cmd
: "<<ALL FILES>>", "execute")); //$NON-NLS-1$ //$NON-NLS-2$
}
/**
* Checks whether the calling thread is allowed to terminate the virtual
* machine.
*
* @param status
* the status that the virtual machine returns when it is
* terminated.
* @throws SecurityException
* if the calling thread is not allowed to terminate the virtual
* machine with {@code status}.
* @since Android 1.0
*/
public void checkExit(int status) {
checkPermission(RuntimePermission.permissionToExitVM);
}
/**
* Checks whether the calling thread is allowed to load the specified native
* library.
*
* @param libName
* the name of the library to load.
* @throws SecurityException
* if the calling thread is not allowed to load {@code libName}.
* @since Android 1.0
*/
public void checkLink(String libName) {
if (libName == null) {
throw new NullPointerException();
}
checkPermission(new RuntimePermission("loadLibrary." + libName)); //$NON-NLS-1$
}
/**
* Checks whether the calling thread is allowed to listen on the specified
* port.
*
* @param port
* the port number to check.
* @throws SecurityException
* if the calling thread is not allowed listen on {@code port}.
* @since Android 1.0
*/
public void checkListen(int port) {
if (port == 0) {
checkPermission(new SocketPermission("localhost:1024-", "listen")); //$NON-NLS-1$ //$NON-NLS-2$
} else {
checkPermission(new SocketPermission("localhost:" + port, "listen")); //$NON-NLS-1$//$NON-NLS-2$
}
}
/**
* Checks whether the calling thread is allowed to access members. The
* default is to allow access to public members (that is, {@code
* java.lang.reflect.Member.PUBLIC}) and to classes loaded by the same
* loader as the original caller (that is, the method that called the
* reflect API). Due to the nature of the check, overriding implementations
* cannot call {@code super.checkMemberAccess()} since the stack would no
* longer be of the expected shape.
*
* @param cls
* the class of which members are accessed.
* @param type
* the access type, either {@code
* java.lang.reflect.Member.PUBLIC} or {@code
* java.lang.reflect.Member.DECLARED}.
* @throws SecurityException
* if the calling thread is not allowed to access members of
* {@code cls}.
* @since Android 1.0
*/
public void checkMemberAccess(Class<?> cls, int type) {
if (cls == null) {
throw new NullPointerException();
}
if (type == Member.PUBLIC) {
return;
}
//
// Need to compare the classloaders.
// Stack shape is
// <user code> <- want this class
// Class.getDeclared*();
// Class.checkMemberAccess();
// SecurityManager.checkMemberAccess(); <- current frame
//
// Use getClassLoaderImpl() since getClassLoader()
// returns null for the bootstrap class loader.
if (ClassLoader.getStackClassLoader(3) == cls.getClassLoaderImpl()) {
return;
}
// Forward off to the permission mechanism.
checkPermission(new RuntimePermission("accessDeclaredMembers")); //$NON-NLS-1$
}
/**
* Checks whether the calling thread is allowed to use the specified IP
* multicast group address.
*
* @param maddr
* the internet group address to use.
* @throws SecurityException
* if the calling thread is not allowed to use {@code maddr}.
* @since Android 1.0
*/
public void checkMulticast(InetAddress maddr) {
checkPermission(new SocketPermission(maddr.getHostAddress(),
"accept,connect")); //$NON-NLS-1$
}
/**
* Checks whether the calling thread is allowed to use the specified IP
* multicast group address.
*
* @param maddr
* the internet group address to use.
* @param ttl
* the value in use for multicast send. This parameter is
* ignored.
* @throws SecurityException
* if the calling thread is not allowed to use {@code maddr}.
* @deprecated use {@link #checkMulticast(java.net.InetAddress)}
* @since Android 1.0
*/
@Deprecated
public void checkMulticast(InetAddress maddr, byte ttl) {
checkPermission(new SocketPermission(maddr.getHostAddress(),
"accept,connect")); //$NON-NLS-1$
}
/**
* Checks whether the calling thread is allowed to access the specified
* package.
*
* @param packageName
* the name of the package to access.
* @throws SecurityException
* if the calling thread is not allowed to access {@code
* packageName}.
* @since Android 1.0
*/
public void checkPackageAccess(String packageName) {
if (packageName == null) {
throw new NullPointerException();
}
if (checkPackageProperty(PKG_ACC_KEY, packageName)) {
checkPermission(new RuntimePermission("accessClassInPackage." //$NON-NLS-1$
+ packageName));
}
}
/**
* Checks whether the calling thread is allowed to define new classes in the
* specified package.
*
* @param packageName
* the name of the package to add a class to.
* @throws SecurityException
* if the calling thread is not allowed to add classes to
* {@code packageName}.
* @since Android 1.0
*/
public void checkPackageDefinition(String packageName) {
if (packageName == null) {
throw new NullPointerException();
}
if (checkPackageProperty(PKG_DEF_KEY, packageName)) {
checkPermission(new RuntimePermission("defineClassInPackage." //$NON-NLS-1$
+ packageName));
}
}
/**
* Returns true if the package name is restricted by the specified security
* property.
*/
private static boolean checkPackageProperty(final String property,
final String pkg) {
String list = AccessController.doPrivileged(PriviAction
.getSecurityProperty(property));
if (list != null) {
int plen = pkg.length();
StringTokenizer tokenizer = new StringTokenizer(list, ", "); //$NON-NLS-1$
while (tokenizer.hasMoreTokens()) {
String token = tokenizer.nextToken();
int tlen = token.length();
if (plen > tlen
&& pkg.startsWith(token)
&& (token.charAt(tlen - 1) == '.' || pkg.charAt(tlen) == '.')) {
return true;
} else if (plen == tlen && token.startsWith(pkg)) {
return true;
} else if (plen + 1 == tlen && token.startsWith(pkg)
&& token.charAt(tlen - 1) == '.') {
return true;
}
}
}
return false;
}
/**
* Checks whether the calling thread is allowed to access the system
* properties.
*
* @throws SecurityException
* if the calling thread is not allowed to access system
* properties.
* @since Android 1.0
*/
public void checkPropertiesAccess() {
checkPermission(READ_WRITE_ALL_PROPERTIES_PERMISSION);
}
/**
* Checks whether the calling thread is allowed to access a particular
* system property.
*
* @param key
* the name of the property to access.
* @throws SecurityException
* if the calling thread is not allowed to access the {@code
* key} system property.
* @since Android 1.0
*/
public void checkPropertyAccess(String key) {
checkPermission(new PropertyPermission(key, "read")); //$NON-NLS-1$
}
/**
* Checks whether the calling thread is allowed to read from the file with
* the specified file descriptor.
*
* @param fd
* the file descriptor of the file to read from.
* @throws SecurityException
* if the calling thread is not allowed to read from {@code fd}.
* @since Android 1.0
*/
public void checkRead(FileDescriptor fd) {
if (fd == null) {
throw new NullPointerException();
}
checkPermission(RuntimePermission.permissionToReadFileDescriptor);
}
/**
* Checks whether the calling thread is allowed to read from the file with
* the specified name, which should be passed in canonical form.
*
* @param file
* the name of the file or directory to read from.
* @throws SecurityException
* if the calling thread is not allowed to read from {@code
* file}.
* @since Android 1.0
*/
public void checkRead(String file) {
checkPermission(new FilePermission(file, "read")); //$NON-NLS-1$
}
/**
* Checks whether the given security context is allowed to read from the
* file named by the argument, which should be passed in canonical form.
*
* @param file
* the name of the file or directory to check.
* @param context
* the security context to use for the check.
* @throws SecurityException
* if {@code context} is not allowed to read from {@code file}.
* @since Android 1.0
*/
public void checkRead(String file, Object context) {
checkPermission(new FilePermission(file, "read"), context); //$NON-NLS-1$
}
/**
* Checks whether the calling thread is allowed to perform the security
* operation named by the target.
*
* @param target
* the name of the operation to perform.
* @throws SecurityException
* if the calling thread is not allowed to perform
* {@code target}.
* @since Android 1.0
*/
public void checkSecurityAccess(String target) {
checkPermission(new SecurityPermission(target));
}
/**
* Checks whether the calling thread is allowed to set the net object
* factories.
*
* @throws SecurityException
* if the calling thread is not allowed to set the net object
* factories.
* @since Android 1.0
*/
public void checkSetFactory() {
checkPermission(RuntimePermission.permissionToSetFactory);
}
/**
* Checks whether the calling thread is trusted to show the specified top
* level window.
*
* @param window
* the window to show.
* @return {@code true} if the calling thread is allowed to show {@code
* window}; {@code false} otherwise.
* @throws NullPointerException
* if {@code window} is {@code null}.
* @since Android 1.0
*/
public boolean checkTopLevelWindow(Object window) {
if (window == null) {
throw new NullPointerException();
}
try {
Class<?> awtPermission = Class.forName("java.awt.AWTPermission"); //$NON-NLS-1$
Constructor<?> constructor = awtPermission
.getConstructor(String.class);
Object perm = constructor
.newInstance("showWindowWithoutWarningBanner"); //$NON-NLS-1$
checkPermission((Permission) perm);
} catch (ClassNotFoundException e) {
} catch (NoSuchMethodException e) {
} catch (InstantiationException e) {
} catch (IllegalAccessException e) {
} catch (InvocationTargetException e) {
} catch (SecurityException e) {
return false;
}
return true;
}
/**
* Checks whether the calling thread is allowed to access the system
* clipboard.
*
* @throws SecurityException
* if the calling thread is not allowed to access the system
* clipboard.
* @since Android 1.0
*/
public void checkSystemClipboardAccess() {
try {
Class<?> awtPermission = Class.forName("java.awt.AWTPermission"); //$NON-NLS-1$
Constructor<?> constructor = awtPermission
.getConstructor(String.class);
Object perm = constructor.newInstance("accessClipboard"); //$NON-NLS-1$
checkPermission((Permission) perm);
return;
} catch (ClassNotFoundException e) {
} catch (NoSuchMethodException e) {
} catch (InstantiationException e) {
} catch (IllegalAccessException e) {
} catch (InvocationTargetException e) {
}
throw new SecurityException();
}
/**
* Checks whether the calling thread is allowed to access the AWT event
* queue.
*
* @throws SecurityException
* if the calling thread is not allowed to access the AWT event
* queue.
* @since Android 1.0
*/
public void checkAwtEventQueueAccess() {
try {
Class<?> awtPermission = Class.forName("java.awt.AWTPermission"); //$NON-NLS-1$
Constructor<?> constructor = awtPermission
.getConstructor(String.class);
Object perm = constructor.newInstance("accessEventQueue"); //$NON-NLS-1$
checkPermission((Permission) perm);
return;
} catch (ClassNotFoundException e) {
} catch (NoSuchMethodException e) {
} catch (InstantiationException e) {
} catch (IllegalAccessException e) {
} catch (InvocationTargetException e) {
}
throw new SecurityException();
}
/**
* Checks whether the calling thread is allowed to start a new print job.
*
* @throws SecurityException
* if the calling thread is not allowed to start a new print
* job.
* @since Android 1.0
*/
public void checkPrintJobAccess() {
checkPermission(RuntimePermission.permissionToQueuePrintJob);
}
/**
* Checks whether the calling thread is allowed to write to the file with
* the specified file descriptor.
*
* @param fd
* the file descriptor of the file to write to.
* @throws SecurityException
* if the calling thread is not allowed to write to {@code fd}.
* @since Android 1.0
*/
public void checkWrite(FileDescriptor fd) {
if (fd == null) {
throw new NullPointerException();
}
checkPermission(RuntimePermission.permissionToWriteFileDescriptor);
}
/**
* Checks whether the calling thread is allowed to write to the file with
* the specified name, which should be passed in canonical form.
*
* @param file
* the name of the file or directory to write to.
* @throws SecurityException
* if the calling thread is not allowed to write to
* {@code file}.
* @since Android 1.0
*/
public void checkWrite(String file) {
checkPermission(new FilePermission(file, "write")); //$NON-NLS-1$
}
/**
* Indicates if this security manager is currently checking something.
*
* @return {@code true} if this security manager is executing a security
* check method; {@code false} otherwise.
* @deprecated Use {@link #checkPermission}.
* @since Android 1.0
*/
@Deprecated
public boolean getInCheck() {
return inCheck;
}
/**
* Returns an array containing one entry for each method in the current
* execution stack. Each entry is the {@code java.lang.Class} which
* represents the class in which the method is defined.
*
* @return all classes in the execution stack.
* @since Android 1.0
*/
@SuppressWarnings("unchecked")
protected Class[] getClassContext() {
return VMStack.getClasses(-1, false);
}
/**
* Returns the class loader of the first class in the execution stack whose
* class loader is not a system class loader.
*
* @return the most recent non-system class loader.
* @deprecated Use {@link #checkPermission}.
* @since Android 1.0
*/
@Deprecated
protected ClassLoader currentClassLoader() {
/*
* First, check if AllPermission is allowed. If so, then we are
* effectively running in an unsafe environment, so just answer null
* (==> everything is a system class).
*/
try {
checkPermission(new AllPermission());
return null;
} catch (SecurityException ex) {
}
/*
* Now, check if there are any non-system class loaders in the stack up
* to the first privileged method (or the end of the stack.
*/
Class<?>[] classes = Class.getStackClasses(-1, true);
for (int i = 0; i < classes.length; i++) {
ClassLoader cl = classes[i].getClassLoaderImpl();
if (!cl.isSystemClassLoader()) {
return cl;
}
}
return null;
}
/**
* Returns the index in the call stack of the first class whose class loader
* is not a system class loader.
*
* @return the frame index of the first method whose class was loaded by a
* non-system class loader.
* @deprecated Use {@link #checkPermission}.
* @since Android 1.0
*/
@Deprecated
protected int classLoaderDepth() {
/*
* First, check if AllPermission is allowed. If so, then we are
* effectively running in an unsafe environment, so just answer -1 (==>
* everything is a system class).
*/
try {
checkPermission(new AllPermission());
return -1;
} catch (SecurityException ex) {
}
/*
* Now, check if there are any non-system class loaders in the stack up
* to the first privileged method (or the end of the stack.
*/
Class<?>[] classes = Class.getStackClasses(-1, true);
for (int i = 0; i < classes.length; i++) {
ClassLoader cl = classes[i].getClassLoaderImpl();
if (!cl.isSystemClassLoader()) {
return i;
}
}
return -1;
}
/**
* Returns the first class in the call stack that was loaded by a class
* loader which is not a system class loader.
*
* @return the most recent class loaded by a non-system class loader.
* @deprecated Use {@link #checkPermission}.
* @since Android 1.0
*/
@Deprecated
protected Class<?> currentLoadedClass() {
/*
* First, check if AllPermission is allowed. If so, then we are
* effectively running in an unsafe environment, so just answer null
* (==> everything is a system class).
*/
try {
checkPermission(new AllPermission());
return null;
} catch (SecurityException ex) {
}
/*
* Now, check if there are any non-system class loaders in the stack up
* to the first privileged method (or the end of the stack.
*/
Class<?>[] classes = Class.getStackClasses(-1, true);
for (int i = 0; i < classes.length; i++) {
ClassLoader cl = classes[i].getClassLoaderImpl();
if (!cl.isSystemClassLoader()) {
return classes[i];
}
}
return null;
}
/**
* Returns the index in the call stack of the first method which is
* contained in the class with the specified name. Returns -1 if no methods
* from this class are in the stack.
*
* @param name
* the name of the class to look for.
* @return the frame index of the first method found is contained in the
* class identified by {@code name}.
* @deprecated Use {@link #checkPermission}.
* @since Android 1.0
*/
@Deprecated
protected int classDepth(String name) {
Class<?>[] classes = Class.getStackClasses(-1, false);
for (int i = 0; i < classes.length; i++) {
if (classes[i].getName().equals(name)) {
return i;
}
}
return -1;
}
/**
* Indicates whether there is a method in the call stack from the class with
* the specified name.
*
* @param name
* the name of the class to look for.
* @return {@code true} if a method from the class identified by {@code
* name} is executing; {@code false} otherwise.
* @deprecated Use {@link #checkPermission}.
* @since Android 1.0
*/
@Deprecated
protected boolean inClass(String name) {
return classDepth(name) != -1;
}
/**
* Indicates whether there is a method in the call stack from a class which
* was defined by a non-system class loader.
*
* @return {@code true} if a method from a class that was defined by a
* non-system class loader is executing; {@code false} otherwise.
* @deprecated Use {@link #checkPermission}
* @since Android 1.0
*/
@Deprecated
protected boolean inClassLoader() {
return currentClassLoader() != null;
}
/**
* Returns the thread group which should be used to instantiate new threads.
* By default, this is the same as the thread group of the thread running
* this method.
*
* @return ThreadGroup the thread group to create new threads in.
* @since Android 1.0
*/
public ThreadGroup getThreadGroup() {
return Thread.currentThread().getThreadGroup();
}
/**
* Returns an object which encapsulates the security state of the current
* point in the execution. In the Android reference implementation, this is
* an {@link java.security.AccessControlContext}.
*
* @return an object that encapsulates information about the current
* execution environment.
* @since Android 1.0
*/
public Object getSecurityContext() {
return AccessController.getContext();
}
/**
* Checks whether the calling thread is allowed to access the resource being
* guarded by the specified permission object.
*
* @param permission
* the permission to check.
* @throws SecurityException
* if the requested {@code permission} is denied according to
* the current security policy.
* @since Android 1.0
*/
public void checkPermission(Permission permission) {
try {
inCheck = true;
AccessController.checkPermission(permission);
} finally {
inCheck = false;
}
}
/**
* Checks whether the specified security context is allowed to access the
* resource being guarded by the specified permission object.
*
* @param permission
* the permission to check.
* @param context
* the security context for which to check permission.
* @throws SecurityException
* if {@code context} is not an instance of {@code
* AccessControlContext} or if the requested {@code permission}
* is denied for {@code context} according to the current
* security policy.
* @since Android 1.0
*/
public void checkPermission(Permission permission, Object context) {
try {
inCheck = true;
// Must be an AccessControlContext. If we don't check
// this, then applications could pass in an arbitrary
// object which circumvents the security check.
if (context instanceof AccessControlContext) {
((AccessControlContext) context).checkPermission(permission);
} else {
throw new SecurityException();
}
} finally {
inCheck = false;
}
}
}
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