Set static policy files in Java 2 security


By configuring the static policy files, the required permission will be granted for all of the Java programs.

Java 2 security uses several policy files to determine the granted permission for each Java program.

See the Java 2 security policy files topic for the list of available policy files that are supported by WAS. Two types of policy files are supported by WAS: dynamic policy files and static policy files. Static policy files provide the default permissions. Dynamic policy files provide application permissions.


Table 1. Policy Files

Policy file name Description
java.policy Contains default permissions for all of the Java programs on the node. This file seldom changes.
server.policy Contains default permissions for all of the WAS programs on the node. This file is rarely updated.
client.policy Contains default permissions for all of the applets and client containers on the node.

The static policy file is not a configuration file that is managed by the repository and the file replication service. Changes to this file are local and do not get replicated to the other machine.

 

  1. Identify the policy file to update.

  2. Stop and restart WAS.

 

Results

The required permission is granted for all of the Java programs that run with the restarted JVM.

 

Example

If Java programs on a node require permissions, the policy file needs updating. If the Java program that required the permission is not part of an enterprise application, update the static policy file. The missing permission results in the creation of the java.security.AccessControlException exception. The missing permission is listed in the exception data.For example:

java.security.AccessControlException: access denied (java.io.FilePermission  C:/WAS_HOME/lib/mail-impl.jar read)

When a Java program receives this exception and adding this permission is justified, add a permission to an adequate policy file. For example:

grant codeBase "file:user_client_installed_location" {
  permission java.io.FilePermission 
  "C:/WAS_HOME/lib/mail-impl.jar", 
  "read";
};

To decide whether to add a permission, refer to Access control exception.


java.policy file permissions
server.policy file permissions
client.policy file permissions

 

Related concepts


Java 2 security
Access control exception

 

Related tasks


Use PolicyTool to edit policy files for Java 2 security
Protecting system resources and APIs (Java 2 security)

 

Related


Java 2 security policy files