- java.lang.Object
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- java.lang.SecurityManager
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- Direct Known Subclasses:
RMISecurityManager
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
SecurityManagerclass contains many methods with names that begin with the wordcheck. These methods are called by various methods in the Java libraries before those methods perform certain potentially sensitive operations. The invocation of such acheckmethod 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
SecurityExceptionif the operation is not permitted.The current security manager is set by the
setSecurityManagermethod in classSystem. The current security manager is obtained by thegetSecurityManagermethod.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 callsAccessController.checkPermission(perm);
If a requested access is allowed,
checkPermissionreturns quietly. If denied, aSecurityExceptionis thrown.The default implementation of each of the other
checkmethods inSecurityManageris to call theSecurityManager checkPermissionmethod to determine if the calling thread has permission to perform the requested operation.Note that the
checkPermissionmethod 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). ThegetSecurityContextmethod and thecheckPermissionmethod that includes a context argument are provided for this situation. ThegetSecurityContextmethod 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
checkPermissionmethod 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 SecurityManagersmobtained 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, andjava.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 isjava.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 ajava.io.FilePermissionobject, 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.FilePermissionobject, 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.AllPermissionpermission 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 Java Development Kit (JDK) for permission-related information. This document includes a table listing the various SecurityManager
checkmethods and the permission(s) the default implementation of each such method requires. It also contains a table of the methods that require permissions, and for each such method tells which permission it requires.- Since:
- 1.0
- See Also:
ClassLoader,SecurityException,getSecurityManager,setSecurityManager,AccessController,AccessControlContext,AccessControlException,Permission,BasicPermission,FilePermission,SocketPermission,PropertyPermission,RuntimePermission,AWTPermission,Policy,SecurityPermission,ProtectionDomain
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Constructor Summary
Constructors Constructor Description SecurityManager()Constructs a newSecurityManager.
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Method Summary
All Methods Instance Methods Concrete Methods Deprecated Methods Modifier and Type Method Description voidcheckAccept(String host, int port)Throws aSecurityExceptionif the calling thread is not permitted to accept a socket connection from the specified host and port number.voidcheckAccess(Thread t)Throws aSecurityExceptionif the calling thread is not allowed to modify the thread argument.voidcheckAccess(ThreadGroup g)Throws aSecurityExceptionif the calling thread is not allowed to modify the thread group argument.voidcheckConnect(String host, int port)Throws aSecurityExceptionif the calling thread is not allowed to open a socket connection to the specified host and port number.voidcheckConnect(String host, int port, Object context)Throws aSecurityExceptionif the specified security context is not allowed to open a socket connection to the specified host and port number.voidcheckCreateClassLoader()Throws aSecurityExceptionif the calling thread is not allowed to create a new class loader.voidcheckDelete(String file)Throws aSecurityExceptionif the calling thread is not allowed to delete the specified file.voidcheckExec(String cmd)Throws aSecurityExceptionif the calling thread is not allowed to create a subprocess.voidcheckExit(int status)Throws aSecurityExceptionif the calling thread is not allowed to cause the Java Virtual Machine to halt with the specified status code.voidcheckLink(String lib)Throws aSecurityExceptionif the calling thread is not allowed to dynamic link the library code specified by the string argument file.voidcheckListen(int port)Throws aSecurityExceptionif the calling thread is not allowed to wait for a connection request on the specified local port number.voidcheckMulticast(InetAddress maddr)Throws aSecurityExceptionif the calling thread is not allowed to use (join/leave/send/receive) IP multicast.voidcheckMulticast(InetAddress maddr, byte ttl)Deprecated.Use #checkPermission(java.security.Permission) insteadvoidcheckPackageAccess(String pkg)Throws aSecurityExceptionif the calling thread is not allowed to access the specified package.voidcheckPackageDefinition(String pkg)Throws aSecurityExceptionif the calling thread is not allowed to define classes in the specified package.voidcheckPermission(Permission perm)Throws aSecurityExceptionif the requested access, specified by the given permission, is not permitted based on the security policy currently in effect.voidcheckPermission(Permission perm, Object context)Throws aSecurityExceptionif the specified security context is denied access to the resource specified by the given permission.voidcheckPrintJobAccess()Throws aSecurityExceptionif the calling thread is not allowed to initiate a print job request.voidcheckPropertiesAccess()Throws aSecurityExceptionif the calling thread is not allowed to access or modify the system properties.voidcheckPropertyAccess(String key)Throws aSecurityExceptionif the calling thread is not allowed to access the system property with the specifiedkeyname.voidcheckRead(FileDescriptor fd)Throws aSecurityExceptionif the calling thread is not allowed to read from the specified file descriptor.voidcheckRead(String file)Throws aSecurityExceptionif the calling thread is not allowed to read the file specified by the string argument.voidcheckRead(String file, Object context)Throws aSecurityExceptionif the specified security context is not allowed to read the file specified by the string argument.voidcheckSecurityAccess(String target)Determines whether the permission with the specified permission target name should be granted or denied.voidcheckSetFactory()Throws aSecurityExceptionif the calling thread is not allowed to set the socket factory used byServerSocketorSocket, or the stream handler factory used byURL.voidcheckWrite(FileDescriptor fd)Throws aSecurityExceptionif the calling thread is not allowed to write to the specified file descriptor.voidcheckWrite(String file)Throws aSecurityExceptionif the calling thread is not allowed to write to the file specified by the string argument.protected Class<?>[]getClassContext()Returns the current execution stack as an array of classes.ObjectgetSecurityContext()Creates an object that encapsulates the current execution environment.ThreadGroupgetThreadGroup()Returns the thread group into which to instantiate any new thread being created at the time this is being called.
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Constructor Detail
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SecurityManager
public SecurityManager()
Constructs a newSecurityManager.If there is a security manager already installed, this method first calls the security manager's
checkPermissionmethod with theRuntimePermission("createSecurityManager")permission to ensure the calling thread has permission to create a new security manager. This may result in throwing aSecurityException.- Throws:
SecurityException- if a security manager already exists and itscheckPermissionmethod doesn't allow creation of a new security manager.- See Also:
System.getSecurityManager(),checkPermission,RuntimePermission
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Method Detail
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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
0is the class of the currently executing method, the element at index1is the class of that method's caller, and so on.- Returns:
- the execution stack.
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getSecurityContext
public Object getSecurityContext()
Creates an object that encapsulates the current execution environment. The result of this method is used, for example, by the three-argumentcheckConnectmethod and by the two-argumentcheckReadmethod. 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
AccessControlContextobject.- 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
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checkPermission
public void checkPermission(Permission perm)
Throws aSecurityExceptionif the requested access, specified by the given permission, is not permitted based on the security policy currently in effect.This method calls
AccessController.checkPermissionwith the given permission.- Parameters:
perm- the requested permission.- Throws:
SecurityException- if access is not permitted based on the current security policy.NullPointerException- if the permission argument isnull.- Since:
- 1.2
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checkPermission
public void checkPermission(Permission perm, Object context)
Throws aSecurityExceptionif 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 togetSecurityContextand the access control decision is based upon the configured security policy for that security context.If
contextis an instance ofAccessControlContextthen theAccessControlContext.checkPermissionmethod is invoked with the specified permission.If
contextis not an instance ofAccessControlContextthen aSecurityExceptionis thrown.- Parameters:
perm- the specified permissioncontext- a system-dependent security context.- Throws:
SecurityException- if the specified security context is not an instance ofAccessControlContext(e.g., isnull), or is denied access to the resource specified by the given permission.NullPointerException- if the permission argument isnull.- Since:
- 1.2
- See Also:
getSecurityContext(),AccessControlContext.checkPermission(java.security.Permission)
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checkCreateClassLoader
public void checkCreateClassLoader()
Throws aSecurityExceptionif the calling thread is not allowed to create a new class loader.This method calls
checkPermissionwith theRuntimePermission("createClassLoader")permission.If you override this method, then you should make a call to
super.checkCreateClassLoaderat the point the overridden method would normally throw an exception.- Throws:
SecurityException- if the calling thread does not have permission to create a new class loader.- See Also:
ClassLoader(),checkPermission
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checkAccess
public void checkAccess(Thread t)
Throws aSecurityExceptionif 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, andsetDaemonmethods of classThread.If the thread argument is a system thread (belongs to the thread group with a
nullparent) then this method callscheckPermissionwith theRuntimePermission("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.checkAccessshould 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.- Throws:
SecurityException- if the calling thread does not have permission to modify the thread.NullPointerException- if the thread argument isnull.- See Also:
resume,setDaemon,setName,setPriority,stop,suspend,checkPermission
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checkAccess
public void checkAccess(ThreadGroup g)
Throws aSecurityExceptionif 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, anddestroymethods of classThreadGroup.If the thread group argument is the system thread group ( has a
nullparent) then this method callscheckPermissionwith theRuntimePermission("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.checkAccessshould 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.- Throws:
SecurityException- if the calling thread does not have permission to modify the thread group.NullPointerException- if the thread group argument isnull.- See Also:
destroy,resume,setDaemon,setMaxPriority,stop,suspend,checkPermission
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checkExit
public void checkExit(int status)
Throws aSecurityExceptionif 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
exitmethod of classRuntime. A status of0indicates success; other values indicate various errors.This method calls
checkPermissionwith theRuntimePermission("exitVM."+status)permission.If you override this method, then you should make a call to
super.checkExitat the point the overridden method would normally throw an exception.- Parameters:
status- the exit status.- Throws:
SecurityException- if the calling thread does not have permission to halt the Java Virtual Machine with the specified status.- See Also:
exit,checkPermission
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checkExec
public void checkExec(String cmd)
Throws aSecurityExceptionif the calling thread is not allowed to create a subprocess.This method is invoked for the current security manager by the
execmethods of classRuntime.This method calls
checkPermissionwith theFilePermission(cmd,"execute")permission if cmd is an absolute path, otherwise it callscheckPermissionwithFilePermission("<<ALL FILES>>","execute").If you override this method, then you should make a call to
super.checkExecat the point the overridden method would normally throw an exception.- Parameters:
cmd- the specified system command.- Throws:
SecurityException- if the calling thread does not have permission to create a subprocess.NullPointerException- if thecmdargument isnull.- See Also:
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
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checkLink
public void checkLink(String lib)
Throws aSecurityExceptionif 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
loadandloadLibraryof classRuntime.This method calls
checkPermissionwith theRuntimePermission("loadLibrary."+lib)permission.If you override this method, then you should make a call to
super.checkLinkat the point the overridden method would normally throw an exception.- Parameters:
lib- the name of the library.- Throws:
SecurityException- if the calling thread does not have permission to dynamically link the library.NullPointerException- if thelibargument isnull.- See Also:
Runtime.load(java.lang.String),Runtime.loadLibrary(java.lang.String),checkPermission
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checkRead
public void checkRead(FileDescriptor fd)
Throws aSecurityExceptionif the calling thread is not allowed to read from the specified file descriptor.This method calls
checkPermissionwith theRuntimePermission("readFileDescriptor")permission.If you override this method, then you should make a call to
super.checkReadat the point the overridden method would normally throw an exception.- Parameters:
fd- the system-dependent file descriptor.- Throws:
SecurityException- if the calling thread does not have permission to access the specified file descriptor.NullPointerException- if the file descriptor argument isnull.- See Also:
FileDescriptor,checkPermission
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checkRead
public void checkRead(String file)
Throws aSecurityExceptionif the calling thread is not allowed to read the file specified by the string argument.This method calls
checkPermissionwith theFilePermission(file,"read")permission.If you override this method, then you should make a call to
super.checkReadat the point the overridden method would normally throw an exception.- Parameters:
file- the system-dependent file name.- Throws:
SecurityException- if the calling thread does not have permission to access the specified file.NullPointerException- if thefileargument isnull.- See Also:
checkPermission
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checkRead
public void checkRead(String file, Object context)
Throws aSecurityExceptionif 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 togetSecurityContext.If
contextis an instance ofAccessControlContextthen theAccessControlContext.checkPermissionmethod will be invoked with theFilePermission(file,"read")permission.If
contextis not an instance ofAccessControlContextthen aSecurityExceptionis thrown.If you override this method, then you should make a call to
super.checkReadat the point the overridden method would normally throw an exception.- Parameters:
file- the system-dependent filename.context- a system-dependent security context.- Throws:
SecurityException- if the specified security context is not an instance ofAccessControlContext(e.g., isnull), or does not have permission to read the specified file.NullPointerException- if thefileargument isnull.- See Also:
getSecurityContext(),AccessControlContext.checkPermission(java.security.Permission)
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checkWrite
public void checkWrite(FileDescriptor fd)
Throws aSecurityExceptionif the calling thread is not allowed to write to the specified file descriptor.This method calls
checkPermissionwith theRuntimePermission("writeFileDescriptor")permission.If you override this method, then you should make a call to
super.checkWriteat the point the overridden method would normally throw an exception.- Parameters:
fd- the system-dependent file descriptor.- Throws:
SecurityException- if the calling thread does not have permission to access the specified file descriptor.NullPointerException- if the file descriptor argument isnull.- See Also:
FileDescriptor,checkPermission
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checkWrite
public void checkWrite(String file)
Throws aSecurityExceptionif the calling thread is not allowed to write to the file specified by the string argument.This method calls
checkPermissionwith theFilePermission(file,"write")permission.If you override this method, then you should make a call to
super.checkWriteat the point the overridden method would normally throw an exception.- Parameters:
file- the system-dependent filename.- Throws:
SecurityException- if the calling thread does not have permission to access the specified file.NullPointerException- if thefileargument isnull.- See Also:
checkPermission
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checkDelete
public void checkDelete(String file)
Throws aSecurityExceptionif the calling thread is not allowed to delete the specified file.This method is invoked for the current security manager by the
deletemethod of classFile.This method calls
checkPermissionwith theFilePermission(file,"delete")permission.If you override this method, then you should make a call to
super.checkDeleteat the point the overridden method would normally throw an exception.- Parameters:
file- the system-dependent filename.- Throws:
SecurityException- if the calling thread does not have permission to delete the file.NullPointerException- if thefileargument isnull.- See Also:
File.delete(),checkPermission
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checkConnect
public void checkConnect(String host, int port)
Throws aSecurityExceptionif the calling thread is not allowed to open a socket connection to the specified host and port number.A port number of
-1indicates that the calling method is attempting to determine the IP address of the specified host name.This method calls
checkPermissionwith theSocketPermission(host+":"+port,"connect")permission if the port is not equal to -1. If the port is equal to -1, then it callscheckPermissionwith theSocketPermission(host,"resolve")permission.If you override this method, then you should make a call to
super.checkConnectat 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.- Throws:
SecurityException- if the calling thread does not have permission to open a socket connection to the specifiedhostandport.NullPointerException- if thehostargument isnull.- See Also:
checkPermission
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checkConnect
public void checkConnect(String host, int port, Object context)
Throws aSecurityExceptionif the specified security context is not allowed to open a socket connection to the specified host and port number.A port number of
-1indicates that the calling method is attempting to determine the IP address of the specified host name.If
contextis not an instance ofAccessControlContextthen aSecurityExceptionis thrown.Otherwise, the port number is checked. If it is not equal to -1, the
context'scheckPermissionmethod is called with aSocketPermission(host+":"+port,"connect")permission. If the port is equal to -1, then thecontext'scheckPermissionmethod is called with aSocketPermission(host,"resolve")permission.If you override this method, then you should make a call to
super.checkConnectat 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.- Throws:
SecurityException- if the specified security context is not an instance ofAccessControlContext(e.g., isnull), or does not have permission to open a socket connection to the specifiedhostandport.NullPointerException- if thehostargument isnull.- See Also:
getSecurityContext(),AccessControlContext.checkPermission(java.security.Permission)
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checkListen
public void checkListen(int port)
Throws aSecurityExceptionif the calling thread is not allowed to wait for a connection request on the specified local port number.This method calls
checkPermissionwith theSocketPermission("localhost:"+port,"listen").If you override this method, then you should make a call to
super.checkListenat the point the overridden method would normally throw an exception.- Parameters:
port- the local port.- Throws:
SecurityException- if the calling thread does not have permission to listen on the specified port.- See Also:
checkPermission
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checkAccept
public void checkAccept(String host, int port)
Throws aSecurityExceptionif 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
acceptmethod of classServerSocket.This method calls
checkPermissionwith theSocketPermission(host+":"+port,"accept")permission.If you override this method, then you should make a call to
super.checkAcceptat 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.- Throws:
SecurityException- if the calling thread does not have permission to accept the connection.NullPointerException- if thehostargument isnull.- See Also:
ServerSocket.accept(),checkPermission
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checkMulticast
public void checkMulticast(InetAddress maddr)
Throws aSecurityExceptionif the calling thread is not allowed to use (join/leave/send/receive) IP multicast.This method calls
checkPermissionwith thejava.net.SocketPermission(maddr.getHostAddress(), "accept,connect")permission.If you override this method, then you should make a call to
super.checkMulticastat the point the overridden method would normally throw an exception.- Parameters:
maddr- Internet group address to be used.- Throws:
SecurityException- if the calling thread is not allowed to use (join/leave/send/receive) IP multicast.NullPointerException- if the address argument isnull.- Since:
- 1.1
- See Also:
checkPermission
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checkMulticast
@Deprecated(since="1.4") public void checkMulticast(InetAddress maddr, byte ttl)
Deprecated.Use #checkPermission(java.security.Permission) insteadThrows aSecurityExceptionif the calling thread is not allowed to use (join/leave/send/receive) IP multicast.This method calls
checkPermissionwith thejava.net.SocketPermission(maddr.getHostAddress(), "accept,connect")permission.If you override this method, then you should make a call to
super.checkMulticastat 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.- Throws:
SecurityException- if the calling thread is not allowed to use (join/leave/send/receive) IP multicast.NullPointerException- if the address argument isnull.- Since:
- 1.1
- See Also:
checkPermission
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checkPropertiesAccess
public void checkPropertiesAccess()
Throws aSecurityExceptionif the calling thread is not allowed to access or modify the system properties.This method is used by the
getPropertiesandsetPropertiesmethods of classSystem.This method calls
checkPermissionwith thePropertyPermission("*", "read,write")permission.If you override this method, then you should make a call to
super.checkPropertiesAccessat the point the overridden method would normally throw an exception.- Throws:
SecurityException- if the calling thread does not have permission to access or modify the system properties.- See Also:
System.getProperties(),System.setProperties(java.util.Properties),checkPermission
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checkPropertyAccess
public void checkPropertyAccess(String key)
Throws aSecurityExceptionif the calling thread is not allowed to access the system property with the specifiedkeyname.This method is used by the
getPropertymethod of classSystem.This method calls
checkPermissionwith thePropertyPermission(key, "read")permission.If you override this method, then you should make a call to
super.checkPropertyAccessat the point the overridden method would normally throw an exception.- Parameters:
key- a system property key.- Throws:
SecurityException- if the calling thread does not have permission to access the specified system property.NullPointerException- if thekeyargument isnull.IllegalArgumentException- ifkeyis empty.- See Also:
System.getProperty(java.lang.String),checkPermission
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checkPrintJobAccess
public void checkPrintJobAccess()
Throws aSecurityExceptionif the calling thread is not allowed to initiate a print job request.This method calls
checkPermissionwith theRuntimePermission("queuePrintJob")permission.If you override this method, then you should make a call to
super.checkPrintJobAccessat the point the overridden method would normally throw an exception.- Throws:
SecurityException- if the calling thread does not have permission to initiate a print job request.- Since:
- 1.1
- See Also:
checkPermission
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checkPackageAccess
public void checkPackageAccess(String pkg)
Throws aSecurityExceptionif the calling thread is not allowed to access the specified package.During class loading, this method may be called by the
loadClassmethod of class loaders and by the Java Virtual Machine to ensure that the caller is allowed to access the package of the class that is being loaded.This method checks if the specified package starts with or equals any of the packages in the
package.accessSecurity Property. An implementation may also check the package against an additional list of restricted packages as noted below. If the package is restricted,checkPermission(Permission)is called with aRuntimePermission("accessClassInPackage."+pkg)permission.If this method is overridden, then
super.checkPackageAccessshould be called as the first line in the overridden method.- Implementation Note:
- This implementation also restricts all non-exported packages of modules loaded by the platform class loader or its ancestors. A "non-exported package" refers to a package that is not exported to all modules. Specifically, it refers to a package that either is not exported at all by its containing module or is exported in a qualified fashion by its containing module.
- Parameters:
pkg- the package name.- Throws:
SecurityException- if the calling thread does not have permission to access the specified package.NullPointerException- if the package name argument isnull.- See Also:
loadClass,getProperty,checkPermission
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checkPackageDefinition
public void checkPackageDefinition(String pkg)
Throws aSecurityExceptionif the calling thread is not allowed to define classes in the specified package.This method is called by the
loadClassmethod of some class loaders.This method checks if the specified package starts with or equals any of the packages in the
package.definitionSecurity Property. An implementation may also check the package against an additional list of restricted packages as noted below. If the package is restricted,checkPermission(Permission)is called with aRuntimePermission("defineClassInPackage."+pkg)permission.If this method is overridden, then
super.checkPackageDefinitionshould be called as the first line in the overridden method.- Implementation Note:
- This implementation also restricts all non-exported packages of modules loaded by the platform class loader or its ancestors. A "non-exported package" refers to a package that is not exported to all modules. Specifically, it refers to a package that either is not exported at all by its containing module or is exported in a qualified fashion by its containing module.
- Parameters:
pkg- the package name.- Throws:
SecurityException- if the calling thread does not have permission to define classes in the specified package.NullPointerException- if the package name argument isnull.- See Also:
ClassLoader.loadClass(String, boolean),getProperty,checkPermission
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checkSetFactory
public void checkSetFactory()
Throws aSecurityExceptionif the calling thread is not allowed to set the socket factory used byServerSocketorSocket, or the stream handler factory used byURL.This method calls
checkPermissionwith theRuntimePermission("setFactory")permission.If you override this method, then you should make a call to
super.checkSetFactoryat the point the overridden method would normally throw an exception.- Throws:
SecurityException- if the calling thread does not have permission to specify a socket factory or a stream handler factory.- See Also:
setSocketFactory,setSocketImplFactory,setURLStreamHandlerFactory,checkPermission
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checkSecurityAccess
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
SecurityPermissionobject for the given permission target name and callscheckPermissionwith it.See the documentation for
for a list of possible permission target names.SecurityPermissionIf you override this method, then you should make a call to
super.checkSecurityAccessat the point the overridden method would normally throw an exception.- Parameters:
target- the target name of theSecurityPermission.- Throws:
SecurityException- if the calling thread does not have permission for the requested access.NullPointerException- iftargetis null.IllegalArgumentException- iftargetis empty.- Since:
- 1.1
- See Also:
checkPermission
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getThreadGroup
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.- Returns:
- ThreadGroup that new threads are instantiated into
- Since:
- 1.1
- See Also:
ThreadGroup
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