Summary
This chapter introduced the concept of what is needed to access system resources from the JRE. Permissions were extended to support many types of access to system resources. The Java 2 SDK had to be extended to support generic permissions instead of specific permissions. There are several ways to look up the permission set, such as an access controller and guarded object. The use of permissions needed changing without changing code so the concept of a protection domain was used that accessed policy files. The policy files are structured to support CodeSource for getting signed and unsigned code updates, principals to check access during runtime, and permission sets. The permissions use name values and operations to pass in the specifics of resources and the operation to check access before execution. In short, there are several ways to extend and use the Java 2 SDK to provide limited access to almost any system resource.
 Java Security Solutions ISBN: 0764549286
EAN: 2147483647 Year: 2001
Pages: 222 Authors: Rich Helton, Johennie Helton
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