public class SecurityManager extends Object
The security manager is a class that allows applications to implement a security policy. It allows an application to determine, before performing a possibly unsafe or sensitive operation, what the operation is and whether it is being attempted in a security context that allows the operation to be performed. The application can allow or disallow the operation.
The SecurityManager
class contains many methods with names that begin with the word check
. These methods are called by various methods in the Java libraries before those methods perform certain potentially sensitive operations. The invocation of such a check
method typically looks like this:
SecurityManager security = System.getSecurityManager(); if (security != null) { security.checkXXX(argument, . . . ); }
The security manager is thereby given an opportunity to prevent completion of the operation by throwing an exception. A security manager routine simply returns if the operation is permitted, but throws a SecurityException
if the operation is not permitted. The only exception to this convention is checkTopLevelWindow
, which returns a boolean
value.
The current security manager is set by the setSecurityManager
method in class System
. The current security manager is obtained by the getSecurityManager
method.
The special method checkPermission(java.security.Permission)
determines whether an access request indicated by a specified permission should be granted or denied. The default implementation calls
AccessController.checkPermission(perm);
If a requested access is allowed, checkPermission
returns quietly. If denied, a SecurityException
is thrown.
As of Java 2 SDK v1.2, the default implementation of each of the other check
methods in SecurityManager
is to call the SecurityManager checkPermission
method to determine if the calling thread has permission to perform the requested operation.
Note that the checkPermission
method with just a single permission argument always performs security checks within the context of the currently executing thread. Sometimes a security check that should be made within a given context will actually need to be done from within a different context (for example, from within a worker thread). The getSecurityContext
method and the checkPermission
method that includes a context argument are provided for this situation. The getSecurityContext
method returns a "snapshot" of the current calling context. (The default implementation returns an AccessControlContext object.) A sample call is the following:
Object context = null; SecurityManager sm = System.getSecurityManager(); if (sm != null) context = sm.getSecurityContext();
The checkPermission
method that takes a context object in addition to a permission makes access decisions based on that context, rather than on that of the current execution thread. Code within a different context can thus call that method, passing the permission and the previously-saved context object. A sample call, using the SecurityManager sm
obtained as in the previous example, is the following:
if (sm != null) sm.checkPermission(permission, context);
Permissions fall into these categories: File, Socket, Net, Security, Runtime, Property, AWT, Reflect, and Serializable. The classes managing these various permission categories are java.io.FilePermission
, java.net.SocketPermission
, java.net.NetPermission
, java.security.SecurityPermission
, java.lang.RuntimePermission
, java.util.PropertyPermission
, java.awt.AWTPermission
, java.lang.reflect.ReflectPermission
, and java.io.SerializablePermission
.
All but the first two (FilePermission and SocketPermission) are subclasses of java.security.BasicPermission
, which itself is an abstract subclass of the top-level class for permissions, which is java.security.Permission
. BasicPermission defines the functionality needed for all permissions that contain a name that follows the hierarchical property naming convention (for example, "exitVM", "setFactory", "queuePrintJob", etc). An asterisk may appear at the end of the name, following a ".", or by itself, to signify a wildcard match. For example: "a.*" or "*" is valid, "*a" or "a*b" is not valid.
FilePermission and SocketPermission are subclasses of the top-level class for permissions (java.security.Permission
). Classes like these that have a more complicated name syntax than that used by BasicPermission subclass directly from Permission rather than from BasicPermission. For example, for a java.io.FilePermission
object, the permission name is the path name of a file (or directory).
Some of the permission classes have an "actions" list that tells the actions that are permitted for the object. For example, for a java.io.FilePermission
object, the actions list (such as "read, write") specifies which actions are granted for the specified file (or for files in the specified directory).
Other permission classes are for "named" permissions - ones that contain a name but no actions list; you either have the named permission or you don't.
Note: There is also a java.security.AllPermission
permission that implies all permissions. It exists to simplify the work of system administrators who might need to perform multiple tasks that require all (or numerous) permissions.
See Permissions in the JDK for permission-related information. This document includes, for example, a table listing the various SecurityManager check
methods and the permission(s) the default implementation of each such method requires. It also contains a table of all the version 1.2 methods that require permissions, and for each such method tells which permission it requires.
For more information about SecurityManager
changes made in the JDK and advice regarding porting of 1.1-style security managers, see the security documentation.
ClassLoader
, SecurityException
, checkTopLevelWindow
, getSecurityManager
, setSecurityManager
, AccessController
, AccessControlContext
, AccessControlException
, Permission
, BasicPermission
, FilePermission
, SocketPermission
, PropertyPermission
, RuntimePermission
, AWTPermission
, Policy
, SecurityPermission
, ProtectionDomain
@Deprecated 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.
public SecurityManager()
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
.
SecurityException
- if a security manager already exists and its checkPermission
method doesn't allow creation of a new security manager.System.getSecurityManager()
, checkPermission
, RuntimePermission
@Deprecated public boolean getInCheck()
Deprecated. This type of security checking is not recommended. It is recommended that the checkPermission
call be used instead.
Tests if there is a security check in progress.
inCheck
field. This field should contain true
if a security check is in progress, false
otherwise.inCheck
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.
@Deprecated 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:
AccessController.doPrivileged(java.security.PrivilegedAction<T>)
) are from classes defined using the system class loader or one of its ancestors. checkPermission
with java.security.AllPermission
does not result in a SecurityException. getSystemClassLoader
, checkPermission
@Deprecated 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:
AccessController.doPrivileged(java.security.PrivilegedAction<T>)
) are from classes defined using the system class loader or one of its ancestors. checkPermission
with java.security.AllPermission
does not result in a SecurityException. getSystemClassLoader
, checkPermission
@Deprecated 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.
name
- the fully qualified name of the class to search for.-1
if such a frame cannot be found.@Deprecated 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:
AccessController.doPrivileged(java.security.PrivilegedAction<T>)
) are from classes defined using the system class loader or one of its ancestors. checkPermission
with java.security.AllPermission
does not result in a SecurityException. getSystemClassLoader
, checkPermission
@Deprecated 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.
name
- the fully qualified name of the class.true
if a method from a class with the specified name is on the execution stack; false
otherwise.@Deprecated 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.
true
if a call to currentClassLoader
has a non-null return value.currentClassLoader
public Object getSecurityContext()
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.
checkConnect
, checkRead
, AccessControlContext
public void checkPermission(Permission perm)
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.
perm
- the requested permission.SecurityException
- if access is not permitted based on the current security policy.NullPointerException
- if the permission argument is null
.public void checkPermission(Permission perm, Object context)
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.
perm
- the specified permissioncontext
- a system-dependent security context.SecurityException
- if the specified security context is not an instance of AccessControlContext
(e.g., is null
), or is denied access to the resource specified by the given permission.NullPointerException
- if the permission argument is null
.getSecurityContext()
, AccessControlContext.checkPermission(java.security.Permission)
public void checkCreateClassLoader()
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.
SecurityException
- if the calling thread does not have permission to create a new class loader.ClassLoader.ClassLoader()
, checkPermission
public void checkAccess(Thread t)
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 JDK 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.
t
- the thread to be checked.SecurityException
- if the calling thread does not have permission to modify the thread.NullPointerException
- if the thread argument is null
.resume
, setDaemon
, setName
, setPriority
, stop
, suspend
, checkPermission
public void checkAccess(ThreadGroup g)
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 JDK 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.
g
- the thread group to be checked.SecurityException
- if the calling thread does not have permission to modify the thread group.NullPointerException
- if the thread group argument is null
.destroy
, resume
, setDaemon
, setMaxPriority
, stop
, suspend
, checkPermission
public void checkExit(int status)
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."+status)
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.
status
- the exit status.SecurityException
- if the calling thread does not have permission to halt the Java Virtual Machine with the specified status.exit
, checkPermission
public void checkExec(String cmd)
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.
cmd
- the specified system command.SecurityException
- if the calling thread does not have permission to create a subprocess.NullPointerException
- if the cmd
argument is null
.Runtime.exec(java.lang.String)
, Runtime.exec(java.lang.String, java.lang.String[])
, Runtime.exec(java.lang.String[])
, Runtime.exec(java.lang.String[], java.lang.String[])
, checkPermission
public void checkLink(String lib)
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.
lib
- the name of the library.SecurityException
- if the calling thread does not have permission to dynamically link the library.NullPointerException
- if the lib
argument is null
.Runtime.load(java.lang.String)
, Runtime.loadLibrary(java.lang.String)
, checkPermission
public void checkRead(FileDescriptor fd)
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.
fd
- the system-dependent file descriptor.SecurityException
- if the calling thread does not have permission to access the specified file descriptor.NullPointerException
- if the file descriptor argument is null
.FileDescriptor
, checkPermission
public void checkRead(String file)
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.
file
- the system-dependent file name.SecurityException
- if the calling thread does not have permission to access the specified file.NullPointerException
- if the file
argument is null
.checkPermission
public void checkRead(String file, Object context)
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.
file
- the system-dependent filename.context
- a system-dependent security context.SecurityException
- if the specified security context is not an instance of AccessControlContext
(e.g., is null
), or does not have permission to read the specified file.NullPointerException
- if the file
argument is null
.getSecurityContext()
, AccessControlContext.checkPermission(java.security.Permission)
public void checkWrite(FileDescriptor fd)
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.
fd
- the system-dependent file descriptor.SecurityException
- if the calling thread does not have permission to access the specified file descriptor.NullPointerException
- if the file descriptor argument is null
.FileDescriptor
, checkPermission
public void checkWrite(String file)
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.
file
- the system-dependent filename.SecurityException
- if the calling thread does not have permission to access the specified file.NullPointerException
- if the file
argument is null
.checkPermission
public void checkDelete(String file)
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.
file
- the system-dependent filename.SecurityException
- if the calling thread does not have permission to delete the file.NullPointerException
- if the file
argument is null
.File.delete()
, checkPermission
public void checkConnect(String host, int port)
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.
host
- the host name port to connect to.port
- the protocol port to connect to.SecurityException
- if the calling thread does not have permission to open a socket connection to the specified host
and port
.NullPointerException
- if the host
argument is null
.checkPermission
public void checkConnect(String host, int port, Object context)
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.
host
- the host name port to connect to.port
- the protocol port to connect to.context
- a system-dependent security context.SecurityException
- if the specified security context is not an instance of AccessControlContext
(e.g., is null
), or does not have permission to open a socket connection to the specified host
and port
.NullPointerException
- if the host
argument is null
.getSecurityContext()
, AccessControlContext.checkPermission(java.security.Permission)
public void checkListen(int port)
Throws a SecurityException
if the calling thread is not allowed to wait for a connection request on the specified local port number.
This method calls checkPermission
with the SocketPermission("localhost:"+port,"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.
port
- the local port.SecurityException
- if the calling thread does not have permission to listen on the specified port.checkPermission
public void checkAccept(String host, int port)
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.
host
- the host name of the socket connection.port
- the port number of the socket connection.SecurityException
- if the calling thread does not have permission to accept the connection.NullPointerException
- if the host
argument is null
.ServerSocket.accept()
, checkPermission
public void checkMulticast(InetAddress maddr)
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.
maddr
- Internet group address to be used.SecurityException
- if the calling thread is not allowed to use (join/leave/send/receive) IP multicast.NullPointerException
- if the address argument is null
.checkPermission
@Deprecated public void checkMulticast(InetAddress maddr, byte ttl)
Deprecated. Use #checkPermission(java.security.Permission) instead
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.
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.SecurityException
- if the calling thread is not allowed to use (join/leave/send/receive) IP multicast.NullPointerException
- if the address argument is null
.checkPermission
public void checkPropertiesAccess()
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.
SecurityException
- if the calling thread does not have permission to access or modify the system properties.System.getProperties()
, System.setProperties(java.util.Properties)
, checkPermission
public void checkPropertyAccess(String key)
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.
key
- a system property key.SecurityException
- if the calling thread does not have permission to access the specified system property.NullPointerException
- if the key
argument is null
.IllegalArgumentException
- if key
is empty.System.getProperty(java.lang.String)
, checkPermission
@Deprecated public boolean checkTopLevelWindow(Object window)
Deprecated. The dependency on AWTPermission
creates an impediment to future modularization of the Java platform. Users of this method should instead invoke checkPermission(java.security.Permission)
directly. This method will be changed in a future release to check the permission java.security.AllPermission
.
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
. In the case of subset Profiles of Java SE that do not include the java.awt
package, checkPermission
is instead called to check the permission java.security.AllPermission
.
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.
window
- the new window that is being created.true
if the calling thread is trusted to put up top-level windows; false
otherwise.NullPointerException
- if the window
argument is null
.Window
, checkPermission
public void checkPrintJobAccess()
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.
SecurityException
- if the calling thread does not have permission to initiate a print job request.checkPermission
@Deprecated public void checkSystemClipboardAccess()
Deprecated. The dependency on AWTPermission
creates an impediment to future modularization of the Java platform. Users of this method should instead invoke checkPermission(java.security.Permission)
directly. This method will be changed in a future release to check the permission java.security.AllPermission
.
Throws a SecurityException
if the calling thread is not allowed to access the system clipboard.
This method calls checkPermission
with the AWTPermission("accessClipboard")
permission. In the case of subset Profiles of Java SE that do not include the java.awt
package, checkPermission
is instead called to check the permission java.security.AllPermission
.
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.
SecurityException
- if the calling thread does not have permission to access the system clipboard.checkPermission
@Deprecated public void checkAwtEventQueueAccess()
Deprecated. The dependency on AWTPermission
creates an impediment to future modularization of the Java platform. Users of this method should instead invoke checkPermission(java.security.Permission)
directly. This method will be changed in a future release to check the permission java.security.AllPermission
.
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. In the case of subset Profiles of Java SE that do not include the java.awt
package, checkPermission
is instead called to check the permission java.security.AllPermission
.
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.
SecurityException
- if the calling thread does not have permission to access the AWT event queue.checkPermission
public void checkPackageAccess(String pkg)
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.
pkg
- the package name.SecurityException
- if the calling thread does not have permission to access the specified package.NullPointerException
- if the package name argument is null
.loadClass
, getProperty
, checkPermission
public void checkPackageDefinition(String pkg)
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.
pkg
- the package name.SecurityException
- if the calling thread does not have permission to define classes in the specified package.ClassLoader.loadClass(java.lang.String, boolean)
, getProperty
, checkPermission
public void checkSetFactory()
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.
SecurityException
- if the calling thread does not have permission to specify a socket factory or a stream handler factory.setSocketFactory
, setSocketImplFactory
, setURLStreamHandlerFactory
, checkPermission
@Deprecated public void checkMemberAccess(Class<?> clazz, int which)
Deprecated. This method relies on the caller being at a stack depth of 4 which is error-prone and cannot be enforced by the runtime. Users of this method should instead invoke checkPermission(java.security.Permission)
directly. This method will be changed in a future release to check the permission java.security.AllPermission
.
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.
clazz
- the class that reflection is to be performed on.which
- type of access, PUBLIC or DECLARED.SecurityException
- if the caller does not have permission to access members.NullPointerException
- if the clazz
argument is null
.Member
, checkPermission
public void checkSecurityAccess(String target)
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
for a list of possible permission target names. SecurityPermission
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.
target
- the target name of the SecurityPermission
.SecurityException
- if the calling thread does not have permission for the requested access.NullPointerException
- if target
is null.IllegalArgumentException
- if target
is empty.checkPermission
public ThreadGroup getThreadGroup()
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.
ThreadGroup
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Documentation extracted from Debian's OpenJDK Development Kit package.
Licensed under the GNU General Public License, version 2, with the Classpath Exception.
Various third party code in OpenJDK is licensed under different licenses (see Debian package).
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