Download Inside Java(TM) 2 Platform Security: Architecture, API by Li Gong PDF

By Li Gong

The executive Java safeguard Architect at solar Microsystems, the place Java comes from, presents an in depth examine the primary workings of Jana safety structure and describes defense instruments and methods for winning implementation. He additionally discusses suggestions for protecting item defense, between them signing, sealing, and guarding items.

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Additional info for Inside Java(TM) 2 Platform Security: Architecture, API Design, and Implementation

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2, that solves a problem with type safety regarding dynamic class loading [73]. This subject of bytecode verification is still evolving, with ongoing work occurring within the J2SDK development team, as well as at research labs and universities. A more formal and precise exposition of the entire language type-safety subject is anticipated for the future. 1 introduced the concept of signed applets. Recall that in the original sandbox model, all remote code—that is, all applets—are automatically untrusted and are restricted to running inside the sandbox.

Type-safe linkage is the mechanism by which the Java virtual machine maintains type safety. It does so by adding link-time checks, which are performed only once, thus avoiding additional runtime checks. In addition, dynamic class loading in the Java platform supports the notion of user-definable class loading policy, whereby user-defined class loaders can customize the means by which classes are discovered and the security attributes assigned to classes loaded from particular sources. Finally, dynamic class loading supports the notion of multiple namespaces.

For example, suppose that a customer of a brokerage firm uses a stock-trading applet loaded from the brokerage's Web site. This customer may want to let the applet update local files that contain her stock portfolio. However, access to the client-side file system is prohibited by the sandbox model. Thus, this customer needs flexible access control, whereby certain applets can have access that is outside the sandbox. 1, the brokerage firm could sign the trading applet, and, assuming that the customer configured her Java runtime to recognize the brokerage firm to be a trusted signer, the applet could access resources outside the sandbox.

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