java.lang
Class SecurityManager

java.lang.Object
  |
  +--java.lang.SecurityManager

public class SecurityManager

extends Object

Untamed:

Field Summary

private static AWTPermission	accessClipboardPermission
private static AllPermission	allPermission
private static AWTPermission	checkAwtEventQueuePermission
private static RuntimePermission	checkMemberAccessPermission
private static RuntimePermission	createClassLoaderPermission
protected boolean	inCheck Deprecated. This type of security checking is not recommended. It is recommended that the checkPermission call be used instead.
private boolean	initialized
private static SocketPermission	localListenPermission
private static String[]	packageAccess
private static boolean	packageAccessValid
private static String[]	packageDefinition
private static boolean	packageDefinitionValid
private static ThreadGroup	rootGroup reference to the root thread group, used for the checkAccess methods.
private static RuntimePermission	threadGroupPermission
private static RuntimePermission	threadPermission
private static AWTPermission	topLevelWindowPermission

Constructor Summary

SecurityManager()
Enabled: Constructs a new SecurityManager.

Method Summary

void	checkAccept(String host, int port) Enabled: Throws a SecurityException if the calling thread is not permitted to accept a socket connection from the specified host and port number.
void	checkAccess(Thread t) Enabled: Throws a SecurityException if the calling thread is not allowed to modify the thread argument.
void	checkAccess(ThreadGroup g) Enabled: Throws a SecurityException if the calling thread is not allowed to modify the thread group argument.
void	checkAwtEventQueueAccess() Enabled: Throws a SecurityException if the calling thread is not allowed to access the AWT event queue.
void	checkConnect(String host, int port) Enabled: Throws a SecurityException if the calling thread is not allowed to open a socket connection to the specified host and port number.
void	checkConnect(String host, int port, Object context) Enabled: Throws a SecurityException if the specified security context is not allowed to open a socket connection to the specified host and port number.
void	checkCreateClassLoader() Enabled: Throws a SecurityException if the calling thread is not allowed to create a new class loader.
void	checkDelete(String file) Enabled: Throws a SecurityException if the calling thread is not allowed to delete the specified file.
void	checkExec(String cmd) Enabled: Throws a SecurityException if the calling thread is not allowed to create a subprocess.
void	checkExit(int status) Enabled: Throws a SecurityException if the calling thread is not allowed to cause the Java Virtual Machine to halt with the specified status code.
void	checkLink(String lib) Enabled: Throws a SecurityException if the calling thread is not allowed to dynamic link the library code specified by the string argument file.
void	checkListen(int port) Enabled: Throws a SecurityException if the calling thread is not allowed to wait for a connection request on the specified local port number.
void	checkMemberAccess(Class clazz, int which) Enabled: Throws a SecurityException if the calling thread is not allowed to access members.
void	checkMulticast(InetAddress maddr) Enabled: Throws a SecurityException if the calling thread is not allowed to use (join/leave/send/receive) IP multicast.
void	checkMulticast(InetAddress maddr, byte ttl) Deprecated. Use #checkPermission(java.security.Permission) instead
void	checkPackageAccess(String pkg) Enabled: Throws a SecurityException if the calling thread is not allowed to access the package specified by the argument.
void	checkPackageDefinition(String pkg) Enabled: Throws a SecurityException if the calling thread is not allowed to define classes in the package specified by the argument.
void	checkPermission(Permission perm) Enabled: Throws a SecurityException if the requested access, specified by the given permission, is not permitted based on the security policy currently in effect.
void	checkPermission(Permission perm, Object context) Enabled: Throws a SecurityException if the specified security context is denied access to the resource specified by the given permission.
void	checkPrintJobAccess() Enabled: Throws a SecurityException if the calling thread is not allowed to initiate a print job request.
void	checkPropertiesAccess() Enabled: Throws a SecurityException if the calling thread is not allowed to access or modify the system properties.
void	checkPropertyAccess(String key) Enabled: Throws a SecurityException if the calling thread is not allowed to access the system property with the specified key name.
void	checkRead(FileDescriptor fd) Enabled: Throws a SecurityException if the calling thread is not allowed to read from the specified file descriptor.
void	checkRead(String file) Enabled: Throws a SecurityException if the calling thread is not allowed to read the file specified by the string argument.
void	checkRead(String file, Object context) Enabled: Throws a SecurityException if the specified security context is not allowed to read the file specified by the string argument.
void	checkSecurityAccess(String target) Enabled: Determines whether the permission with the specified permission target name should be granted or denied.
void	checkSetFactory() Enabled: Throws a SecurityException if the calling thread is not allowed to set the socket factory used by ServerSocket or Socket, or the stream handler factory used by URL.
void	checkSystemClipboardAccess() Enabled: Throws a SecurityException if the calling thread is not allowed to access the system clipboard.
boolean	checkTopLevelWindow(Object window) Enabled: Returns false if the calling thread is not trusted to bring up the top-level window indicated by the window argument.
void	checkWrite(FileDescriptor fd) Enabled: Throws a SecurityException if the calling thread is not allowed to write to the specified file descriptor.
void	checkWrite(String file) Enabled: Throws a SecurityException if the calling thread is not allowed to write to the file specified by the string argument.
protected int	classDepth(String name) Deprecated. This type of security checking is not recommended. It is recommended that the checkPermission call be used instead.
protected int	classLoaderDepth() Deprecated. This type of security checking is not recommended. It is recommended that the checkPermission call be used instead.
private int	classLoaderDepth0()
protected ClassLoader	currentClassLoader() Deprecated. This type of security checking is not recommended. It is recommended that the checkPermission call be used instead.
private ClassLoader	currentClassLoader0()
protected Class	currentLoadedClass() Deprecated. This type of security checking is not recommended. It is recommended that the checkPermission call be used instead.
private Class	currentLoadedClass0()
protected Class[]	getClassContext() Returns the current execution stack as an array of classes.
boolean	getInCheck() Deprecated. This type of security checking is not recommended. It is recommended that the checkPermission call be used instead.
private static String[]	getPackages(String p)
private static ThreadGroup	getRootGroup()
Object	getSecurityContext() Enabled: Creates an object that encapsulates the current execution environment.
ThreadGroup	getThreadGroup() Enabled: Returns the thread group into which to instantiate any new thread being created at the time this is being called.
private boolean	hasAllPermission() returns true if the current context has been granted AllPermission
protected boolean	inClass(String name) Deprecated. This type of security checking is not recommended. It is recommended that the checkPermission call be used instead.
protected boolean	inClassLoader() Deprecated. This type of security checking is not recommended. It is recommended that the checkPermission call be used instead.

Methods inherited from class java.lang.Object

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

Field Detail

inCheck

protected boolean inCheck

Deprecated. This type of security checking is not recommended. It is recommended that the checkPermission call be used instead.

This field is true if there is a security check in progress; false otherwise.

initialized

private boolean initialized

createClassLoaderPermission

private static RuntimePermission createClassLoaderPermission

topLevelWindowPermission

private static AWTPermission topLevelWindowPermission

accessClipboardPermission

private static AWTPermission accessClipboardPermission

checkAwtEventQueuePermission

private static AWTPermission checkAwtEventQueuePermission

checkMemberAccessPermission

private static RuntimePermission checkMemberAccessPermission

allPermission

private static AllPermission allPermission

threadPermission

private static RuntimePermission threadPermission

threadGroupPermission

private static RuntimePermission threadGroupPermission

rootGroup

private static ThreadGroup rootGroup

reference to the root thread group, used for the checkAccess methods.

localListenPermission

private static SocketPermission localListenPermission

packageAccessValid

private static boolean packageAccessValid

packageAccess

private static String[] packageAccess

packageDefinitionValid

private static boolean packageDefinitionValid

packageDefinition

private static String[] packageDefinition

Constructor Detail

SecurityManager

public SecurityManager()

Enabled: Constructs a new SecurityManager.

If there is a security manager already installed, this method first calls the security manager's checkPermission method with the RuntimePermission("createSecurityManager") permission to ensure the calling thread has permission to create a new security manager. This may result in throwing a SecurityException.

See Also:

java.lang.System#getSecurityManager(), checkPermission, java.lang.RuntimePermission

Method Detail

hasAllPermission

private boolean hasAllPermission()

returns true if the current context has been granted AllPermission

getInCheck

public boolean getInCheck()

Deprecated. This type of security checking is not recommended. It is recommended that the checkPermission call be used instead.

Enabled: Tests if there is a security check in progress.

Returns:

the value of the inCheck field. This field should contain true if a security check is in progress, false otherwise.

See Also:

java.lang.SecurityManager#inCheck

getClassContext

protected Class[] getClassContext()

Returns the current execution stack as an array of classes.

The length of the array is the number of methods on the execution stack. The element at index 0 is the class of the currently executing method, the element at index 1 is the class of that method's caller, and so on.

Returns:

the execution stack.

currentClassLoader

protected ClassLoader currentClassLoader()

Deprecated. This type of security checking is not recommended. It is recommended that the checkPermission call be used instead.

Returns the class loader of the most recently executing method from a class defined using a non-system class loader. A non-system class loader is defined as being a class loader that is not equal to the system class loader (as returned by ClassLoader.getSystemClassLoader()) or one of its ancestors.

This method will return null in the following three cases:

1. All methods on the execution stack are from classes defined using the system class loader or one of its ancestors.
2. All methods on the execution stack up to the first "privileged" caller (see java.security.AccessController#doPrivileged) are from classes defined using the system class loader or one of its ancestors.
3. A call to checkPermission with java.security.AllPermission does not result in a SecurityException.

Returns:

the class loader of the most recent occurrence on the stack of a method from a class defined using a non-system class loader.

See Also:

getSystemClassLoader, checkPermission

currentClassLoader0

private ClassLoader currentClassLoader0()

currentLoadedClass

protected Class currentLoadedClass()

Deprecated. This type of security checking is not recommended. It is recommended that the checkPermission call be used instead.

Returns the class of the most recently executing method from a class defined using a non-system class loader. A non-system class loader is defined as being a class loader that is not equal to the system class loader (as returned by ClassLoader.getSystemClassLoader()) or one of its ancestors.

This method will return null in the following three cases:

1. All methods on the execution stack are from classes defined using the system class loader or one of its ancestors.
2. All methods on the execution stack up to the first "privileged" caller (see java.security.AccessController#doPrivileged) are from classes defined using the system class loader or one of its ancestors.
3. A call to checkPermission with java.security.AllPermission does not result in a SecurityException.

Returns:

the class of the most recent occurrence on the stack of a method from a class defined using a non-system class loader.

See Also:

getSystemClassLoader, checkPermission

classDepth

protected int classDepth(String name)

Deprecated. This type of security checking is not recommended. It is recommended that the checkPermission call be used instead.

Returns the stack depth of the specified class.

Parameters:

name - the fully qualified name of the class to search for.

Returns:

the depth on the stack frame of the first occurrence of a method from a class with the specified name; -1 if such a frame cannot be found.

classLoaderDepth

protected int classLoaderDepth()

Deprecated. This type of security checking is not recommended. It is recommended that the checkPermission call be used instead.

Returns the stack depth of the most recently executing method from a class defined using a non-system class loader. A non-system class loader is defined as being a class loader that is not equal to the system class loader (as returned by ClassLoader.getSystemClassLoader()) or one of its ancestors.

This method will return -1 in the following three cases:

1. All methods on the execution stack are from classes defined using the system class loader or one of its ancestors.
2. All methods on the execution stack up to the first "privileged" caller (see java.security.AccessController#doPrivileged) are from classes defined using the system class loader or one of its ancestors.
3. A call to checkPermission with java.security.AllPermission does not result in a SecurityException.

Returns:

the depth on the stack frame of the most recent occurrence of a method from a class defined using a non-system class loader.

See Also:

getSystemClassLoader, checkPermission

classLoaderDepth0

private int classLoaderDepth0()

inClass

protected boolean inClass(String name)

Deprecated. This type of security checking is not recommended. It is recommended that the checkPermission call be used instead.

Tests if a method from a class with the specified name is on the execution stack.

Parameters:

name - the fully qualified name of the class.

Returns:

true if a method from a class with the specified name is on the execution stack; false otherwise.

inClassLoader

protected boolean inClassLoader()

Deprecated. This type of security checking is not recommended. It is recommended that the checkPermission call be used instead.

Basically, tests if a method from a class defined using a class loader is on the execution stack.

Returns:

true if a call to currentClassLoader has a non-null return value.

See Also:

currentClassLoader

getSecurityContext

public Object getSecurityContext()

Enabled: Creates an object that encapsulates the current execution environment. The result of this method is used, for example, by the three-argument checkConnect method and by the two-argument checkRead method. These methods are needed because a trusted method may be called on to read a file or open a socket on behalf of another method. The trusted method needs to determine if the other (possibly untrusted) method would be allowed to perform the operation on its own.

The default implementation of this method is to return an AccessControlContext object.

Returns:

an implementation-dependent object that encapsulates sufficient information about the current execution environment to perform some security checks later.

See Also:

checkConnect, checkRead, AccessControlContext

checkPermission

public void checkPermission(Permission perm)

Enabled: Throws a SecurityException if the requested access, specified by the given permission, is not permitted based on the security policy currently in effect.

This method calls AccessController.checkPermission with the given permission.

Parameters:

perm - the requested permission.

Since:

1.2

checkPermission

public void checkPermission(Permission perm,
                            Object context)

Enabled: Throws a SecurityException if the specified security context is denied access to the resource specified by the given permission. The context must be a security context returned by a previous call to getSecurityContext and the access control decision is based upon the configured security policy for that security context.

If context is an instance of AccessControlContext then the AccessControlContext.checkPermission method is invoked with the specified permission.

If context is not an instance of AccessControlContext then a SecurityException is thrown.

Parameters:

perm - the specified permission

context - a system-dependent security context.

Since:

1.2

See Also:

java.lang.SecurityManager#getSecurityContext(), java.security.AccessControlContext#checkPermission(java.security.Permission)

checkCreateClassLoader

public void checkCreateClassLoader()

Enabled: Throws a SecurityException if the calling thread is not allowed to create a new class loader.

This method calls checkPermission with the RuntimePermission("createClassLoader") permission.

If you override this method, then you should make a call to super.checkCreateClassLoader at the point the overridden method would normally throw an exception.

See Also:

java.lang.ClassLoader#ClassLoader(), checkPermission

getRootGroup

private static ThreadGroup getRootGroup()

checkAccess

public void checkAccess(Thread t)

Enabled: Throws a SecurityException if the calling thread is not allowed to modify the thread argument.

This method is invoked for the current security manager by the stop, suspend, resume, setPriority, setName, and setDaemon methods of class Thread.

If the thread argument is a system thread (belongs to the thread group with a null parent) then this method calls checkPermission with the RuntimePermission("modifyThread") permission. If the thread argument is not a system thread, this method just returns silently.

Applications that want a stricter policy should override this method. If this method is overridden, the method that overrides it should additionally check to see if the calling thread has the RuntimePermission("modifyThread") permission, and if so, return silently. This is to ensure that code granted that permission (such as the SDK itself) is allowed to manipulate any thread.

If this method is overridden, then super.checkAccess should be called by the first statement in the overridden method, or the equivalent security check should be placed in the overridden method.

Parameters:

t - the thread to be checked.

See Also:

resume, setDaemon, setName, setPriority, stop, suspend, checkPermission

checkAccess

public void checkAccess(ThreadGroup g)

Enabled: Throws a SecurityException if the calling thread is not allowed to modify the thread group argument.

This method is invoked for the current security manager when a new child thread or child thread group is created, and by the setDaemon, setMaxPriority, stop, suspend, resume, and destroy methods of class ThreadGroup.

If the thread group argument is the system thread group ( has a null parent) then this method calls checkPermission with the RuntimePermission("modifyThreadGroup") permission. If the thread group argument is not the system thread group, this method just returns silently.

Applications that want a stricter policy should override this method. If this method is overridden, the method that overrides it should additionally check to see if the calling thread has the RuntimePermission("modifyThreadGroup") permission, and if so, return silently. This is to ensure that code granted that permission (such as the SDK itself) is allowed to manipulate any thread.

If this method is overridden, then super.checkAccess should be called by the first statement in the overridden method, or the equivalent security check should be placed in the overridden method.

Parameters:

g - the thread group to be checked.

See Also:

destroy, resume, setDaemon, setMaxPriority, stop, suspend, checkPermission

checkExit

public void checkExit(int status)

Enabled: Throws a SecurityException if the calling thread is not allowed to cause the Java Virtual Machine to halt with the specified status code.

This method is invoked for the current security manager by the exit method of class Runtime. A status of 0 indicates success; other values indicate various errors.

This method calls checkPermission with the RuntimePermission("exitVM") permission.

If you override this method, then you should make a call to super.checkExit at the point the overridden method would normally throw an exception.

Parameters:

status - the exit status.

See Also:

exit, checkPermission

checkExec

public void checkExec(String cmd)

Enabled: Throws a SecurityException if the calling thread is not allowed to create a subprocess.

This method is invoked for the current security manager by the exec methods of class Runtime.

This method calls checkPermission with the FilePermission(cmd,"execute") permission if cmd is an absolute path, otherwise it calls checkPermission with FilePermission("<<ALL FILES>>","execute").

If you override this method, then you should make a call to super.checkExec at the point the overridden method would normally throw an exception.

Parameters:

cmd - the specified system command.

See Also:

java.lang.Runtime#exec(java.lang.String), java.lang.Runtime#exec(java.lang.String, java.lang.String[]), java.lang.Runtime#exec(java.lang.String[]), java.lang.Runtime#exec(java.lang.String[], java.lang.String[]), checkPermission

checkLink

public void checkLink(String lib)

Enabled: Throws a SecurityException if the calling thread is not allowed to dynamic link the library code specified by the string argument file. The argument is either a simple library name or a complete filename.

This method is invoked for the current security manager by methods load and loadLibrary of class Runtime.

This method calls checkPermission with the RuntimePermission("loadLibrary."+lib) permission.

If you override this method, then you should make a call to super.checkLink at the point the overridden method would normally throw an exception.

Parameters:

lib - the name of the library.

See Also:

java.lang.Runtime#load(java.lang.String), java.lang.Runtime#loadLibrary(java.lang.String), checkPermission

checkRead

public void checkRead(FileDescriptor fd)

Enabled: Throws a SecurityException if the calling thread is not allowed to read from the specified file descriptor.

This method calls checkPermission with the RuntimePermission("readFileDescriptor") permission.

If you override this method, then you should make a call to super.checkRead at the point the overridden method would normally throw an exception.

Parameters:

fd - the system-dependent file descriptor.

See Also:

java.io.FileDescriptor, checkPermission

checkRead

public void checkRead(String file)

Enabled: Throws a SecurityException if the calling thread is not allowed to read the file specified by the string argument.

This method calls checkPermission with the FilePermission(file,"read") permission.

If you override this method, then you should make a call to super.checkRead at the point the overridden method would normally throw an exception.

Parameters:

file - the system-dependent file name.

See Also:

checkPermission

checkRead

public void checkRead(String file,
                      Object context)

Enabled: Throws a SecurityException if the specified security context is not allowed to read the file specified by the string argument. The context must be a security context returned by a previous call to getSecurityContext.

If context is an instance of AccessControlContext then the AccessControlContext.checkPermission method will be invoked with the FilePermission(file,"read") permission.

If context is not an instance of AccessControlContext then a SecurityException is thrown.

If you override this method, then you should make a call to super.checkRead at the point the overridden method would normally throw an exception.

Parameters:

file - the system-dependent filename.

context - a system-dependent security context.

See Also:

java.lang.SecurityManager#getSecurityContext(), java.security.AccessControlContext#checkPermission(java.security.Permission)

checkWrite

public void checkWrite(FileDescriptor fd)

Enabled: Throws a SecurityException if the calling thread is not allowed to write to the specified file descriptor.

This method calls checkPermission with the RuntimePermission("writeFileDescriptor") permission.

If you override this method, then you should make a call to super.checkWrite at the point the overridden method would normally throw an exception.

Parameters:

fd - the system-dependent file descriptor.

See Also:

java.io.FileDescriptor, checkPermission

checkWrite

public void checkWrite(String file)

Enabled: Throws a SecurityException if the calling thread is not allowed to write to the file specified by the string argument.

This method calls checkPermission with the FilePermission(file,"write") permission.

If you override this method, then you should make a call to super.checkWrite at the point the overridden method would normally throw an exception.

Parameters:

file - the system-dependent filename.

See Also:

checkPermission

checkDelete

public void checkDelete(String file)

Enabled: Throws a SecurityException if the calling thread is not allowed to delete the specified file.

This method is invoked for the current security manager by the delete method of class File.

This method calls checkPermission with the FilePermission(file,"delete") permission.

If you override this method, then you should make a call to super.checkDelete at the point the overridden method would normally throw an exception.

Parameters:

file - the system-dependent filename.

See Also:

java.io.File#delete(), checkPermission

checkConnect

public void checkConnect(String host,
                         int port)

Enabled: Throws a SecurityException if the calling thread is not allowed to open a socket connection to the specified host and port number.

A port number of -1 indicates that the calling method is attempting to determine the IP address of the specified host name.

This method calls checkPermission with the SocketPermission(host+":"+port,"connect") permission if the port is not equal to -1. If the port is equal to -1, then it calls checkPermission with the SocketPermission(host,"resolve") permission.

If you override this method, then you should make a call to super.checkConnect at the point the overridden method would normally throw an exception.

Parameters:

host - the host name port to connect to.

port - the protocol port to connect to.

See Also:

checkPermission

checkConnect

public void checkConnect(String host,
                         int port,
                         Object context)

Enabled: Throws a SecurityException if the specified security context is not allowed to open a socket connection to the specified host and port number.

A port number of -1 indicates that the calling method is attempting to determine the IP address of the specified host name.

If context is not an instance of AccessControlContext then a SecurityException is thrown.

Otherwise, the port number is checked. If it is not equal to -1, the context's checkPermission method is called with a SocketPermission(host+":"+port,"connect") permission. If the port is equal to -1, then the context's checkPermission method is called with a SocketPermission(host,"resolve") permission.

If you override this method, then you should make a call to super.checkConnect at the point the overridden method would normally throw an exception.

Parameters:

host - the host name port to connect to.

port - the protocol port to connect to.

context - a system-dependent security context.

See Also:

java.lang.SecurityManager#getSecurityContext(), java.security.AccessControlContext#checkPermission(java.security.Permission)

checkListen

public void checkListen(int port)

Enabled: Throws a SecurityException if the calling thread is not allowed to wait for a connection request on the specified local port number.

If port is not 0, this method calls checkPermission with the SocketPermission("localhost:"+port,"listen"). If port is zero, this method calls checkPermission with SocketPermission("localhost:1024-","listen").

If you override this method, then you should make a call to super.checkListen at the point the overridden method would normally throw an exception.

Parameters:

port - the local port.

See Also:

checkPermission

checkAccept

public void checkAccept(String host,
                        int port)

Enabled: Throws a SecurityException if the calling thread is not permitted to accept a socket connection from the specified host and port number.

This method is invoked for the current security manager by the accept method of class ServerSocket.

This method calls checkPermission with the SocketPermission(host+":"+port,"accept") permission.

If you override this method, then you should make a call to super.checkAccept at the point the overridden method would normally throw an exception.

Parameters:

host - the host name of the socket connection.

port - the port number of the socket connection.

See Also:

java.net.ServerSocket#accept(), checkPermission

checkMulticast

public void checkMulticast(InetAddress maddr)

Enabled: Throws a SecurityException if the calling thread is not allowed to use (join/leave/send/receive) IP multicast.

This method calls checkPermission with the java.net.SocketPermission(maddr.getHostAddress(), "accept,connect") permission.

If you override this method, then you should make a call to super.checkMulticast at the point the overridden method would normally throw an exception.

Parameters:

maddr - Internet group address to be used.

Since:

JDK1.1

See Also:

checkPermission

checkMulticast

public void checkMulticast(InetAddress maddr,
                           byte ttl)

Deprecated. Use #checkPermission(java.security.Permission) instead

Enabled: Throws a SecurityException if the calling thread is not allowed to use (join/leave/send/receive) IP multicast.

This method calls checkPermission with the java.net.SocketPermission(maddr.getHostAddress(), "accept,connect") permission.

If you override this method, then you should make a call to super.checkMulticast at the point the overridden method would normally throw an exception.

Parameters:

maddr - Internet group address to be used.

ttl - value in use, if it is multicast send. Note: this particular implementation does not use the ttl parameter.

Since:

JDK1.1

See Also:

checkPermission

checkPropertiesAccess

public void checkPropertiesAccess()

Enabled: Throws a SecurityException if the calling thread is not allowed to access or modify the system properties.

This method is used by the getProperties and setProperties methods of class System.

This method calls checkPermission with the PropertyPermission("*", "read,write") permission.

If you override this method, then you should make a call to super.checkPropertiesAccess at the point the overridden method would normally throw an exception.

See Also:

java.lang.System#getProperties(), java.lang.System#setProperties(java.util.Properties), checkPermission

checkPropertyAccess

public void checkPropertyAccess(String key)

Enabled: Throws a SecurityException if the calling thread is not allowed to access the system property with the specified key name.

This method is used by the getProperty method of class System.

This method calls checkPermission with the PropertyPermission(key, "read") permission.

If you override this method, then you should make a call to super.checkPropertyAccess at the point the overridden method would normally throw an exception.

Parameters:

key - a system property key.

See Also:

java.lang.System#getProperty(java.lang.String), checkPermission

checkTopLevelWindow

public boolean checkTopLevelWindow(Object window)

Enabled: Returns false if the calling thread is not trusted to bring up the top-level window indicated by the window argument. In this case, the caller can still decide to show the window, but the window should include some sort of visual warning. If the method returns true, then the window can be shown without any special restrictions.

See class Window for more information on trusted and untrusted windows.

This method calls checkPermission with the AWTPermission("showWindowWithoutWarningBanner") permission, and returns true if a SecurityException is not thrown, otherwise it returns false.

If you override this method, then you should make a call to super.checkTopLevelWindow at the point the overridden method would normally return false, and the value of super.checkTopLevelWindow should be returned.

Parameters:

window - the new window that is being created.

Returns:

true if the calling thread is trusted to put up top-level windows; false otherwise.

See Also:

java.awt.Window, checkPermission

checkPrintJobAccess

public void checkPrintJobAccess()

Enabled: Throws a SecurityException if the calling thread is not allowed to initiate a print job request.

This method calls checkPermission with the RuntimePermission("queuePrintJob") permission.

If you override this method, then you should make a call to super.checkPrintJobAccess at the point the overridden method would normally throw an exception.

Since:

JDK1.1

See Also:

checkPermission

checkSystemClipboardAccess

public void checkSystemClipboardAccess()

Enabled: Throws a SecurityException if the calling thread is not allowed to access the system clipboard.

This method calls checkPermission with the AWTPermission("accessClipboard") permission.

If you override this method, then you should make a call to super.checkSystemClipboardAccess at the point the overridden method would normally throw an exception.

Since:

JDK1.1

See Also:

checkPermission

checkAwtEventQueueAccess

public void checkAwtEventQueueAccess()

Enabled: Throws a SecurityException if the calling thread is not allowed to access the AWT event queue.

This method calls checkPermission with the AWTPermission("accessEventQueue") permission.

If you override this method, then you should make a call to super.checkAwtEventQueueAccess at the point the overridden method would normally throw an exception.

Since:

JDK1.1

See Also:

checkPermission

getPackages

private static String[] getPackages(String p)

checkPackageAccess

public void checkPackageAccess(String pkg)

Enabled: Throws a SecurityException if the calling thread is not allowed to access the package specified by the argument.

This method is used by the loadClass method of class loaders.

This method first gets a list of restricted packages by obtaining a comma-separated list from a call to java.security.Security.getProperty("package.access"), and checks to see if pkg starts with or equals any of the restricted packages. If it does, then checkPermission gets called with the RuntimePermission("accessClassInPackage."+pkg) permission.

If this method is overridden, then super.checkPackageAccess should be called as the first line in the overridden method.

Parameters:

pkg - the package name.

See Also:

loadClass, getProperty, checkPermission

checkPackageDefinition

public void checkPackageDefinition(String pkg)

Enabled: Throws a SecurityException if the calling thread is not allowed to define classes in the package specified by the argument.

This method is used by the loadClass method of some class loaders.

This method first gets a list of restricted packages by obtaining a comma-separated list from a call to java.security.Security.getProperty("package.definition"), and checks to see if pkg starts with or equals any of the restricted packages. If it does, then checkPermission gets called with the RuntimePermission("defineClassInPackage."+pkg) permission.

If this method is overridden, then super.checkPackageDefinition should be called as the first line in the overridden method.

Parameters:

pkg - the package name.

See Also:

java.lang.ClassLoader#loadClass(java.lang.String, boolean), getProperty, checkPermission

checkSetFactory

public void checkSetFactory()

Enabled: Throws a SecurityException if the calling thread is not allowed to set the socket factory used by ServerSocket or Socket, or the stream handler factory used by URL.

This method calls checkPermission with the RuntimePermission("setFactory") permission.

If you override this method, then you should make a call to super.checkSetFactory at the point the overridden method would normally throw an exception.

See Also:

setSocketFactory, setSocketImplFactory, setURLStreamHandlerFactory, checkPermission

checkMemberAccess

public void checkMemberAccess(Class clazz,
                              int which)

Enabled: Throws a SecurityException if the calling thread is not allowed to access members.

The default policy is to allow access to PUBLIC members, as well as access to classes that have the same class loader as the caller. In all other cases, this method calls checkPermission with the RuntimePermission("accessDeclaredMembers") permission.

If this method is overridden, then a call to super.checkMemberAccess cannot be made, as the default implementation of checkMemberAccess relies on the code being checked being at a stack depth of 4.

Parameters:

clazz - the class that reflection is to be performed on.

which - type of access, PUBLIC or DECLARED.

Since:

JDK1.1

See Also:

java.lang.reflect.Member, checkPermission

checkSecurityAccess

public void checkSecurityAccess(String target)

Enabled: Determines whether the permission with the specified permission target name should be granted or denied.

If the requested permission is allowed, this method returns quietly. If denied, a SecurityException is raised.

This method creates a SecurityPermission object for the given permission target name and calls checkPermission with it.

See the documentation for java.security.SecurityPermission for a list of possible permission target names.

If you override this method, then you should make a call to super.checkSecurityAccess at the point the overridden method would normally throw an exception.

Parameters:

target - the target name of the SecurityPermission.

Since:

JDK1.1

See Also:

checkPermission

currentLoadedClass0

private Class currentLoadedClass0()

getThreadGroup

public ThreadGroup getThreadGroup()

Enabled: Returns the thread group into which to instantiate any new thread being created at the time this is being called. By default, it returns the thread group of the current thread. This should be overridden by a specific security manager to return the appropriate thread group.

Returns:

ThreadGroup that new threads are instantiated into

Since:

JDK1.1

See Also:

java.lang.ThreadGroup