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Identify Locations for Implementation of Security Features
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<weblogic-ejb-jar> <weblogic-enterprise-bean> <ejb-name>ProgrammaticSecurity</ejb-name> ... </weblogic-enterprise-bean> <security-role-assignment> <role-name>programmatic_role</role-name> <principal-name>system</principal-name> <principal-name>auser</principal-name> </security-role-assignment> </weblogic-ejb-jar>
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In this excerpt, the security-role-assignment declares and resolves the role-name (programmatic_role), specified within the assembly-descriptor element of the EJB deployment descriptor, to one or more principal identities (system and auser) that are known to an authentication realm within the WebLogic server. Here is an example of enterprise bean code that programmatically determines whether the caller is permitted to execute the method:
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package javaee.architect.ProgrammaticSecurity; import javax.ejb.*; // A stateless session bean. public class ProgrammaticSecurityBean implements SessionBean { SessionContext sessionContext; private static final String ROLE_REQUIRED = "programmatic"; // Bean s methods required by EJB specification. public void ejbCreate() throws CreateException {log("ejbCreate()");} public void ejbRemove() {log("ejbRemove()");} public void ejbActivate() {log("ejbActivate()");} public void ejbPassivate() {log("ejbPassivate()");} public void setSessionContext(SessionContext parm) { this.sessionContext = parm; } // Bean s business methods. public String method1() { log("method1() called by user " +sessionContext.getCallerPrincipal().getName()); return " method1 executed."; } public String method2() throws EJBException { log("method2() called by user " +sessionContext.getCallerPrincipal().getName()); if (!sessionContext.isCallerInRole(ROLE_REQUIRED)) throw new EJBException ("insufficient permission to access method2");
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// Place method functionality here... return " method2 executed."; } private void log(String parm) { System.out.println(new java.util.Date() +":ProgrammaticSecurityBean:"+this.hashCode()+" "+parm); } }
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By defining a clear separation of the responsibilities for securing an application among those that develop components, those that assemble components, and those that deploy application components, the JEE platform achieves its goal of making the details of security much more simple and easy to implement. The component-provider role identifies all the security dependencies embedded in the component, including the following:
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n The role names used in method isUserInRole() for web components and
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isCallerInRole() for EJB components
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n References made by the component to other components n References to external resources accessed by the component n The method permission model, including information that identifies the
sensitivity of the information exchanged or processing that occurs in individual methods The application-assembler role combines one or more components into an application package and then produces an overall security view for the whole application. The deployer role takes this overall security view and uses it to secure the application for target environment. The deployer does this by mapping the security view elements to the actual policies and mechanisms that exist in the target environment. How this mapping occurs will depend on the vendor for the web and EJB containers. In some cases, additional deployment descriptors resolve this mapping, and in other cases a vendor-specific tool must be used.
Java 5 Annotation Facility
With the arrival of Java 5, one of the most significant changes in authorization is in the use of annotations. It is now possible to define custom annotations and
Identify Locations for Implementation of Security Features
then apply these annotations to fields, methods, classes, etc. Annotations do not directly affect program semantics, but compile or runtime tools can examine them to generate additional constructs (for example, deployment descriptors) or implement required runtime behavior (for example, EJB component s state).
Using Java 5 Annotations with Web components With Java version 5 and beyond, in addition to the declarative and programmatic security specifications mentioned already, application developers can now programmatically set up the security for web components by using Java s annotation facility. If a value is specified in an annotation and also in the deployment descriptor, the value in the deployment descriptor takes precedence. The granularity of overriding is on the per-method basis. In addition, the web-app element of the web application deployment descriptor can now contain a full attribute. This full attribute states whether deployment descriptor is complete, or whether the class files of the web archive (WAR) file should be examined for annotations that specify deployment information. If the full attribute is missing or set to false, the deployment descriptors examine the class files of applications for annotations that specify deployment information. If the full attribute is set to true, the deployment descriptor ignores any servlet annotations present in the class files. This feature allows the application deployer to customize or override the values specified in annotations. Web application class files can specify the following annotations:
n Declare roles for the EJB module using the @DeclareRoles annotation. n Set the security identity using the @RunAs annotation.
Using Java 5 Annotations with EJB components One of the goals in EJB 3.0 is to reduce the number of pieces that a bean provider must provide. In the EJB 3.0 world, all kinds of enterprise beans are plain old Java objects (POJO) with appropriate annotations. Annotations can be used to define the bean s business interface, Object/Relational (O/R) mapping information, resource references, and practically anything else that was previously defined by deployment descriptors or interfaces in the prior EJB specifications. Consequently, deployment descriptors are no longer required, the home interface is no more, and you don t necessarily have to implement a business (remote) interface because the container can generate it for you.
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