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Lesson: Signing Code and Granting It Permissions (The Java™ Tutorials > Security Features in Java SE)
Trail: Security Features in Java SE
Lesson: Signing Code and Granting It Permissions

This lesson shows how to use use keytool, jarsigner, Policy Tool and jar to place files into JAR (Java ARchive) files for subsequent signing by the jarsigner tool.

This lesson has two parts. First, you will create and deploy an application. Second; you will act as the recipient of a signed application.

Here are the steps to create and deploy an application:

Note:  For convenience, you pretend to be a user/developer named Susan Jones. You need to define Susan Jones when you generate the keys.

  • Put Java class files comprising your application into a JAR file
  • Sign the JAR file
  • Export the public key certificate corresponding to the private key used to sign the JAR file

Here are the steps to grant permissions to an application

Note:  For convenience, you pretend to be a user named Ray.

  • You see how the signed application cannot normally read a file when it is run under a security manager.
  • Use keytool to import a certificate into Ray's keystore in an entry aliased by susan
  • Use the Policy Tool to create an entry in Ray's policy file to permit code signed by susan to read the specified file.
  • Finally, you see how the application running under a security manager can now read the file, since it has been granted permission to do so.

For more information about digital signatures, certificates, keystores, and the tools, see the API and Tools Use for Secure Code and File Exchanges lesson.


Important: You need to perform the tasks in this lesson while working in the directory in which you store the sample application, but you should store the data file needed by the application in a different directory. All examples in this trail assume that you are working in the C:\Test directory, and that the data file is in the C:\TestData directory.

If you are working on a UNIX system, substitute your own directory names.

Here are the steps:

Previous page: Previous Lesson
Next page: Steps for the Code Signer

JAVA, JSP, SERVLETS, TOMCAT, SERVLETS MANAGER,
Private JVM (Java Virtual Machine),
Private Tomcat Server

Alden Hosting offers private JVM (Java Virtual Machine), Java Server Pages (JSP), Servlets, and Servlets Manager with our Web Hosting Plans WEB 4 PLAN and WEB 5 PLAN , WEB 6 PLAN .

At Alden Hosting we eat and breathe Java! We are the industry leader in providing affordable, quality and efficient Java web hosting in the shared hosting marketplace. All our sites run on our Java hosing platform configured for optimum performance using Java 1.6, Tomcat 6, MySQL 5, Apache 2.2 and web application frameworks such as Struts, Hibernate, Cocoon, Ant, etc.

We offer only one type of Java hosting - Private Tomcat. Hosting accounts on the Private Tomcat environment get their very own Tomcat server. You can start and re-start your entire Tomcat server yourself.


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