: Class SecurityManager

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com.softplc
Class SecurityManager

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

public class SecurityManager
extends java.lang.SecurityManager

The SoftPLC security manager class restricts what can be done under SoftPLC. It allows all Java code to be screened at runtime before performing a possibly unsafe or sensitive operation.

For example, it is normally not desirable to perform a System.exit() while under SoftPLC since this would stop the Ladder scan as well. It is also normally not desirable to exec() another application, as this would screw up the scheduling of CPU time and cause the Ladder scan to be neglected. It is the SecurityManager's role to enforce a policy in these and other areas.

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. 



Since: 
JDK1.0
See Also: 
SecurityManager, 
ClassLoader, 
SecurityException, 
SecurityManager.checkTopLevelWindow(java.lang.Object), 
java.lang.System#getSecurityManager(), 
java.lang.System#setSecurityManager(java.lang.SecurityManager)











Fields inherited from class java.lang.SecurityManager


inCheck


 






Constructor Summary


SecurityManager()



           


 






Method Summary



 void
checkAccept(java.lang.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.



 void
checkAccess(java.lang.Thread g)



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



 void
checkAccess(java.lang.ThreadGroup g)



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



 void
checkAwtEventQueueAccess()



          Tests if a client can get access to the AWT event queue.



 void
checkConnect(java.lang.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.



 void
checkConnect(java.lang.String host,
             int port,
             java.lang.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.



 void
checkCreateClassLoader()



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



 void
checkDelete(java.lang.String file)



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



 void
checkExec(java.lang.String cmd)



          Throws a SecurityException if the 
 calling thread is not allowed to create a subprocss.



 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.



 void
checkLink(java.lang.String lib)



          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)



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



 void
checkMemberAccess(java.lang.Class clazz,
                  int which)



          Tests if a client is allowed to access members.



 void
checkMulticast(java.net.InetAddress maddr)



          Tests if current execution context is allowed to use
 (join/leave/send/receive) IP multicast.



 void
checkMulticast(java.net.InetAddress maddr,
               byte ttl)



          Tests to see if current execution context is allowed to use
 (join/leave/send/receive) IP multicast.



 void
checkPackageAccess(java.lang.String pkg)



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



 void
checkPackageDefinition(java.lang.String pkg)



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



 void
checkPrintJobAccess()



          Tests if a client can initiate a print job request.



 void
checkPropertiesAccess()



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



 void
checkPropertyAccess(java.lang.String key)



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



 void
checkRead(java.io.FileDescriptor fd)



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



 void
checkRead(java.lang.String file)



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



 void
checkRead(java.lang.String file,
          java.lang.Object context)



          Throws a SecurityException if the 
 specified security context is not allowed to read the file 
 specified by the string argument.



 void
checkSecurityAccess(java.lang.String action)



          Tests access to certain operations for a security API
 action.



 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.



 void
checkSystemClipboardAccess()



          Tests if a client can get access to the system clipboard.



 boolean
checkTopLevelWindow(java.lang.Object window)



          Returns false if the calling 
 thread is not trusted to bring up the top-level window indicated 
 by the window argument.



 void
checkWrite(java.io.FileDescriptor fd)



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



 void
checkWrite(java.lang.String file)



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



 java.lang.Object
getSecurityContext()



          Creates an object that encapsulates the current execution 
 environment.



 java.lang.ThreadGroup
getThreadGroup()



          Returns the thread group into which to instantiate any new
 thread being created at the time this is being called.


 


Methods inherited from class java.lang.SecurityManager


checkPermission, checkPermission, classDepth, classLoaderDepth, currentClassLoader, currentLoadedClass, getClassContext, getInCheck, inClass, inClassLoader


 


Methods inherited from class java.lang.Object


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


 











Constructor Detail




SecurityManager
public SecurityManager()









Method Detail




getSecurityContext
public java.lang.Object getSecurityContext()

Creates an object that encapsulates the current execution 
 environment. The result of this method is used 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.

Overrides:
getSecurityContext in class java.lang.SecurityManager


Returns:
an implementation-dependent object that encapsulates
          sufficient information about the current execution environment
          to perform some security checks later.
Since: 
JDK1.0
See Also: 
SecurityManager.checkConnect(java.lang.String, int, java.lang.Object), 
SecurityManager.checkRead(java.lang.String, java.lang.Object)





checkCreateClassLoader
public void checkCreateClassLoader()

Throws a SecurityException if the 
 calling thread is not allowed to create a new class loader. 
 
 The checkCreateClassLoader method for class 
 SecurityManager always throws a 
 SecurityException.

Overrides:
checkCreateClassLoader in class java.lang.SecurityManager


Throws:
java.lang.SecurityException - if the caller does not have permission
             to create a new class loader.
Since: 
JDK1.0






checkAccess
public void checkAccess(java.lang.Thread g)

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. 
 

 The checkAccess method for class 
 SecurityManager always throws a 
 SecurityException.

Overrides:
checkAccess in class java.lang.SecurityManager


Parameters:
g - the thread to be checked.
Throws:
java.lang.SecurityException - if the caller does not have permission
               to modify the thread.
Since: 
JDK1.0
See Also: 
java.lang.System#getSecurityManager(), 
Thread.resume(), 
Thread.setDaemon(boolean), 
Thread.setName(java.lang.String), 
Thread.setPriority(int), 
Thread.stop(), 
Thread.suspend()





checkAccess
public void checkAccess(java.lang.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. 
 

 The checkAccess method for class 
 SecurityManager always throws a 
 SecurityException.

Overrides:
checkAccess in class java.lang.SecurityManager


Parameters:
g - the thread group to be checked.
Throws:
java.lang.SecurityException - if the caller does not have permission
               to modify the thread group.
Since: 
JDK1.0
See Also: 
java.lang.System#getSecurityManager(), 
ThreadGroup.destroy(), 
ThreadGroup.resume(), 
ThreadGroup.setDaemon(boolean), 
ThreadGroup.setMaxPriority(int), 
ThreadGroup.stop(), 
ThreadGroup.suspend()





checkExit
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. 
 

 The checkExit method for class 
 SecurityManager always throws a 
 SecurityException.

Overrides:
checkExit in class java.lang.SecurityManager


Parameters:
status - the exit status.
Throws:
java.lang.SecurityException - if the caller does not have permission
               to halt the Java Virtual Machine with the specified status.
Since: 
JDK1.0
See Also: 
java.lang.Runtime#exit(int), 
java.lang.System#getSecurityManager()





checkExec
public void checkExec(java.lang.String cmd)

Throws a SecurityException if the 
 calling thread is not allowed to create a subprocss. 
 
 This method is invoked for the current security manager by the 
 exec methods of class Runtime.
 

 The checkExec method for class 
 SecurityManager always throws a 
 SecurityException.

Overrides:
checkExec in class java.lang.SecurityManager


Parameters:
cmd - the specified system command.
Throws:
java.lang.SecurityException - if the caller does not have permission
               to create a subprocess.
Since: 
JDK1.0
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[]), 
java.lang.System#getSecurityManager()





checkLink
public void checkLink(java.lang.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. 
 

 The checkLink method for class 
 SecurityManager always throws a 
 SecurityException.

Overrides:
checkLink in class java.lang.SecurityManager


Parameters:
lib - the name of the library.
Throws:
java.lang.SecurityException - if the caller does not have permission
               to dynamically link the library.
Since: 
JDK1.0
See Also: 
java.lang.Runtime#load(java.lang.String), 
java.lang.Runtime#loadLibrary(java.lang.String), 
java.lang.System#getSecurityManager()





checkRead
public void checkRead(java.io.FileDescriptor fd)

Throws a SecurityException if the 
 calling thread is not allowed to read from the specified file 
 descriptor. 
 
 The checkRead method for class 
 SecurityManager always throws a 
 SecurityException.

Overrides:
checkRead in class java.lang.SecurityManager


Parameters:
fd - the system-dependent file descriptor.
Throws:
java.lang.SecurityException - if the caller does not have permission
               to access the specified file descriptor.
Since: 
JDK1.0
See Also: 
FileDescriptor





checkRead
public void checkRead(java.lang.String file)

Throws a SecurityException if the 
 calling thread is not allowed to read the file specified by the 
 string argument. 
 
 The checkRead method for class 
 SecurityManager always throws a 
 SecurityException.

Overrides:
checkRead in class java.lang.SecurityManager


Parameters:
file - the system-dependent file name.
Throws:
java.lang.SecurityException - if the caller does not have permission
               to access the specified file.
Since: 
JDK1.0






checkRead
public void checkRead(java.lang.String file,
                      java.lang.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. 
 
 The checkRead method for class 
 SecurityManager always throws a 
 SecurityException.

Overrides:
checkRead in class java.lang.SecurityManager


Parameters:
file - the system-dependent filename.
context - a system-dependent security context.
Throws:
java.lang.SecurityException - if the specified security context does
               not have permission to read the specified file.
Since: 
JDK1.0
See Also: 
SecurityManager.getSecurityContext()





checkWrite
public void checkWrite(java.io.FileDescriptor fd)

Throws a SecurityException if the 
 calling thread is not allowed to write to the specified file 
 descriptor. 
 
 The checkWrite method for class 
 SecurityManager always throws a 
 SecurityException.

Overrides:
checkWrite in class java.lang.SecurityManager


Parameters:
fd - the system-dependent file descriptor.
Throws:
java.lang.SecurityException - if the caller does not have permission
               to access the specified file descriptor.
Since: 
JDK1.0
See Also: 
FileDescriptor





checkWrite
public void checkWrite(java.lang.String file)

Throws a SecurityException if the 
 calling thread is not allowed to write to the file specified by 
 the string argument. 
 
 The checkWrite method for class 
 SecurityManager always throws a 
 SecurityException.

Overrides:
checkWrite in class java.lang.SecurityManager


Parameters:
file - the system-dependent filename.
Throws:
java.lang.SecurityException - if the caller does not have permission
               to access the specified file.
Since: 
JDK1.0






checkDelete
public void checkDelete(java.lang.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.
 

 The checkDelete method for class 
 SecurityManager always throws a 
 SecurityException.

Overrides:
checkDelete in class java.lang.SecurityManager


Parameters:
file - the system-dependent filename.
Throws:
java.lang.SecurityException - if the caller does not have permission
               to delete the file.
Since: 
JDK1.0
See Also: 
File.delete(), 
java.lang.System#getSecurityManager()





checkConnect
public void checkConnect(java.lang.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. 
 

 The checkConnect method for class 
 SecurityManager always throws a 
 SecurityException.

Overrides:
checkConnect in class java.lang.SecurityManager


Parameters:
host - the host name port to connect to.
port - the protocol port to connect to.
Throws:
java.lang.SecurityException - if the caller does not have permission
               to open a socket connection to the specified
               host and port.
Since: 
JDK1.0






checkConnect
public void checkConnect(java.lang.String host,
                         int port,
                         java.lang.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. 
 

 The checkConnect method for class 
 SecurityManager always throws a 
 SecurityException.

Overrides:
checkConnect in class java.lang.SecurityManager


Parameters:
host - the host name port to connect to.
port - the protocol port to connect to.
context - a system-dependent security context.
Throws:
java.lang.SecurityException - if the specified security context does
               not have permission to open a socket connection to the
               specified host and port.
Since: 
JDK1.0
See Also: 
SecurityManager.getSecurityContext()





checkListen
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. 
 
 The checkListen method for class 
 SecurityManager always throws a 
 SecurityException.

Overrides:
checkListen in class java.lang.SecurityManager


Parameters:
port - the local port.
Throws:
java.lang.SecurityException - if the caller does not have permission
               to listen on the specified port.
Since: 
JDK1.0






checkAccept
public void checkAccept(java.lang.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. 
 

 The checkAccept method for class 
 SecurityManager always throws a
 SecurityException.

Overrides:
checkAccept in class java.lang.SecurityManager


Parameters:
host - the host name of the socket connection.
port - the port number of the socket connection.
Throws:
java.lang.SecurityException - if the caller does not have permission
               to accept the connection.
Since: 
JDK1.0
See Also: 
java.lang.System#getSecurityManager(), 
ServerSocket.accept()





checkMulticast
public void checkMulticast(java.net.InetAddress maddr)

Tests if current execution context is allowed to use
 (join/leave/send/receive) IP multicast.

Overrides:
checkMulticast in class java.lang.SecurityManager


Parameters:
multicast - Internet group address to be used.
Throws:
java.lang.SecurityException - if a security error has occurred.
Since: 
JDK1.1






checkMulticast
public void checkMulticast(java.net.InetAddress maddr,
                           byte ttl)

Tests to see if current execution context is allowed to use
 (join/leave/send/receive) IP multicast.

Overrides:
checkMulticast in class java.lang.SecurityManager


Parameters:
multicast - Internet group address to be used.
ttl - value in use, if it is multicast send.
Throws:
java.lang.SecurityException - if a security error has occurred.
Since: 
JDK1.1






checkPropertiesAccess
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. 
 

 The checkPropertiesAccess method for class 
 SecurityManager always throws a 
 SecurityException.

Overrides:
checkPropertiesAccess in class java.lang.SecurityManager


Throws:
java.lang.SecurityException - if the caller does not have permission
               to access or modify the system properties.
Since: 
JDK1.0
See Also: 
java.lang.System#getProperties(), 
java.lang.System#setProperties(java.util.Properties)





checkPropertyAccess
public void checkPropertyAccess(java.lang.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. 
 

 The checkPropertiesAccess method for class 
 SecurityManager always throws a 
 SecurityException.

Overrides:
checkPropertyAccess in class java.lang.SecurityManager


Parameters:
key - a system property key.
Throws:
java.lang.SecurityException - if the caller does not have permission
               to access the specified system property.
Since: 
JDK1.0
See Also: 
java.lang.System#getProperty(java.lang.String)





checkTopLevelWindow
public boolean checkTopLevelWindow(java.lang.Object window)

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. 
 

 The checkSetFactory method for class 
 SecurityManager always returns false.

Overrides:
checkTopLevelWindow in class java.lang.SecurityManager


Parameters:
window - the new window that is being created.
Returns:
true if the caller is trusted to put up
             top-level windows; false otherwise.
Throws:
java.lang.SecurityException - if creation is disallowed entirely.
Since: 
JDK1.0
See Also: 
java.awt.Window





checkPrintJobAccess
public void checkPrintJobAccess()

Tests if a client can initiate a print job request.

Overrides:
checkPrintJobAccess in class java.lang.SecurityManager


Since: 
JDK1.1






checkSystemClipboardAccess
public void checkSystemClipboardAccess()

Tests if a client can get access to the system clipboard.

Overrides:
checkSystemClipboardAccess in class java.lang.SecurityManager


Since: 
JDK1.1






checkAwtEventQueueAccess
public void checkAwtEventQueueAccess()

Tests if a client can get access to the AWT event queue.

Overrides:
checkAwtEventQueueAccess in class java.lang.SecurityManager


Since: 
JDK1.1






checkPackageAccess
public void checkPackageAccess(java.lang.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. 
 

 The checkPackageAccess method for class 
 SecurityManager always throws a 
 SecurityException.

Overrides:
checkPackageAccess in class java.lang.SecurityManager


Parameters:
pkg - the package name.
Throws:
java.lang.SecurityException - if the caller does not have permission
               to access the specified package.
Since: 
JDK1.0
See Also: 
ClassLoader.loadClass(java.lang.String, boolean)





checkPackageDefinition
public void checkPackageDefinition(java.lang.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. 
 

 The checkPackageDefinition method for class 
 SecurityManager always throws a 
 SecurityException.

Overrides:
checkPackageDefinition in class java.lang.SecurityManager


Parameters:
pkg - the package name.
Throws:
java.lang.SecurityException - if the caller does not have permission
               to define classes in the specified package.
Since: 
JDK1.0
See Also: 
ClassLoader.loadClass(java.lang.String, boolean)





checkSetFactory
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. 
 
 The checkSetFactory method for class 
 SecurityManager always throws a 
 SecurityException.

Overrides:
checkSetFactory in class java.lang.SecurityManager


Throws:
java.lang.SecurityException - if the caller does not have permission
               to specify a socket factory or a stream handler factory.
Since: 
JDK1.0
See Also: 
ServerSocket.setSocketFactory(java.net.SocketImplFactory), 
Socket.setSocketImplFactory(java.net.SocketImplFactory), 
URL.setURLStreamHandlerFactory(java.net.URLStreamHandlerFactory)





checkMemberAccess
public void checkMemberAccess(java.lang.Class clazz,
                              int which)

Tests if a client is allowed to access members. If access is
 denied, throw a SecurityException.
 The default policy is to deny all accesses.

Overrides:
checkMemberAccess in class java.lang.SecurityManager


Since: 
JDK1.1






checkSecurityAccess
public void checkSecurityAccess(java.lang.String action)

Tests access to certain operations for a security API
 action.

Overrides:
checkSecurityAccess in class java.lang.SecurityManager


Since: 
JDK1.1






getThreadGroup
public java.lang.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 overriden by specific security
 manager to return the appropriate thread group.

Overrides:
getThreadGroup in class java.lang.SecurityManager


Since: 
JDK1.1













  
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Method Summary
`void`	`checkAccept(java.lang.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.
`void`	`checkAccess(java.lang.Thread g)` Throws a `SecurityException` if the calling thread is not allowed to modify the thread argument.
`void`	`checkAccess(java.lang.ThreadGroup g)` Throws a `SecurityException` if the calling thread is not allowed to modify the thread group argument.
`void`	`checkAwtEventQueueAccess()` Tests if a client can get access to the AWT event queue.
`void`	`checkConnect(java.lang.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.
`void`	`checkConnect(java.lang.String host, int port, java.lang.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.
`void`	`checkCreateClassLoader()` Throws a `SecurityException` if the calling thread is not allowed to create a new class loader.
`void`	`checkDelete(java.lang.String file)` Throws a `SecurityException` if the calling thread is not allowed to delete the specified file.
`void`	`checkExec(java.lang.String cmd)` Throws a `SecurityException` if the calling thread is not allowed to create a subprocss.
`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.
`void`	`checkLink(java.lang.String lib)` 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)` Throws a `SecurityException` if the calling thread is not allowed to wait for a connection request on the specified local port number.
`void`	`checkMemberAccess(java.lang.Class clazz, int which)` Tests if a client is allowed to access members.
`void`	`checkMulticast(java.net.InetAddress maddr)` Tests if current execution context is allowed to use (join/leave/send/receive) IP multicast.
`void`	`checkMulticast(java.net.InetAddress maddr, byte ttl)` Tests to see if current execution context is allowed to use (join/leave/send/receive) IP multicast.
`void`	`checkPackageAccess(java.lang.String pkg)` Throws a `SecurityException` if the calling thread is not allowed to access the package specified by the argument.
`void`	`checkPackageDefinition(java.lang.String pkg)` Throws a `SecurityException` if the calling thread is not allowed to define classes in the package specified by the argument.
`void`	`checkPrintJobAccess()` Tests if a client can initiate a print job request.
`void`	`checkPropertiesAccess()` Throws a `SecurityException` if the calling thread is not allowed to access or modify the system properties.
`void`	`checkPropertyAccess(java.lang.String key)` Throws a `SecurityException` if the calling thread is not allowed to access the system property with the specified `key` name.
`void`	`checkRead(java.io.FileDescriptor fd)` Throws a `SecurityException` if the calling thread is not allowed to read from the specified file descriptor.
`void`	`checkRead(java.lang.String file)` Throws a `SecurityException` if the calling thread is not allowed to read the file specified by the string argument.
`void`	`checkRead(java.lang.String file, java.lang.Object context)` Throws a `SecurityException` if the specified security context is not allowed to read the file specified by the string argument.
`void`	`checkSecurityAccess(java.lang.String action)` Tests access to certain operations for a security API action.
`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`.
`void`	`checkSystemClipboardAccess()` Tests if a client can get access to the system clipboard.
`boolean`	`checkTopLevelWindow(java.lang.Object window)` Returns `false` if the calling thread is not trusted to bring up the top-level window indicated by the `window` argument.
`void`	`checkWrite(java.io.FileDescriptor fd)` Throws a `SecurityException` if the calling thread is not allowed to write to the specified file descriptor.
`void`	`checkWrite(java.lang.String file)` Throws a `SecurityException` if the calling thread is not allowed to write to the file specified by the string argument.
`java.lang.Object`	`getSecurityContext()` Creates an object that encapsulates the current execution environment.
`java.lang.ThreadGroup`	`getThreadGroup()` Returns the thread group into which to instantiate any new thread being created at the time this is being called.

Constructor Summary
`SecurityManager()`

com.softplc Class SecurityManager

SecurityManager

getSecurityContext

checkCreateClassLoader

checkAccess

checkAccess

checkExit

checkExec

checkLink

checkRead

checkRead

checkRead

checkWrite

checkWrite

checkDelete

checkConnect

checkConnect

checkListen

checkAccept

checkMulticast

checkMulticast

checkPropertiesAccess

checkPropertyAccess

checkTopLevelWindow

checkPrintJobAccess

checkSystemClipboardAccess

checkAwtEventQueueAccess

checkPackageAccess

checkPackageDefinition

checkSetFactory

checkMemberAccess

checkSecurityAccess

getThreadGroup

com.softplc
Class SecurityManager