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The web tier gathers authentication information from the user and authenticates the supplied credentials using JAAS against an underlying security system A successful authentication results in a valid user Principal At this point, the Principal is associated with one or more roles For each secured web/EJB tier resource, the application server checks if the principal/role is authorized to access the resource The Principal is transparently passed from the web tier to the EJB tier as needed A detailed discussion of web tier authentication and authorization is beyond the scope of this book, as is the extremely rare scenario of standalone EJB authentication using JAAS However, we ll give you a basic outline of web tier security to.

Here is a simple publish method that appropriately creates messages for the message-driven bean message selector:

AOP, similar to facade objects, must implement the javax.ejb.SessionBean interface; business objects, such as entity EJBs, must implement the javax.ejb.EntityBean interface. AOP can be used, like for the session facade, through a marker interface. package aop.j2ee.business; public interface EntityBeanProtocol {} This empty interface must be implemented by the business objects or any entity EJB that will have minimal impact on the code. An aspect (such as the one in Listing 11-3) transforms POJOs into EJBs and implements the needed methods. Listing 11-3. An Aspect to Transform POJO into an Entity EJB package aop.j2ee.business.aspect; import java.sql.*; import javax.ejb.*; import aop.j2ee.business.aspect.marker.EntityBeanProtocol; public abstract aspect POJOEntity extends EJBResolver { declare parents: EntityBeanProtocol extends javax.ejb.EntityBean; private EntityContext EntityBeanProtocol.context; // generic EJB home methods ================================ public String EntityBeanProtocol .ejbFindByPrimaryKey(String primaryKey) throws FinderException { boolean result; try { result = selectByPrimaryKey(primaryKey); } catch (Exception ex) { throw new EJBException("ejbFindByPrimaryKey: " + ex.getMessage()); } if (result) { return primaryKey; } else { throw new ObjectNotFoundException

serve as a starting point for further investigation before diving into authorization management in EJB 3. Web tier authentication and authorization The web tier servlet specification (http://java.sun.com/products/servlet/) successfully hides a great many low-level details for both authentication and authorization. As a developer, you simply need to tell the servlet container what resources you want secured, how they are secured, how authentication credentials are gathered, and what roles have access to secured resources. The servlet container, for the most part, takes care of the rest. Web tier security is mainly configured using the login-config and security-constraint elements of the web.xml file. Listing 6.4 shows how securing the administrative module of ActionBazaar might look using these elements.

Listing 6.4 Sample web.xml elements to secure order canceling and other ActionBazaar admin functionality

public void publish(String role) throws JMSException { MapMessage message = topicSession.createMapMessage(); message.setString("UserRole",role); message.setStringProperty("UserRole",role); System.out.println( "Publishing message to Role:" + role ); topicPublisher.publish(message); }

<login-config> <auth-method>BASIC</auth-method> <realm-name>ActionBazaarRealm</realm-name> </login-config>

("Row for id " + primaryKey + " not found."); } } // generic EJB methods ===================================== public void EntityBeanProtocol.ejbRemove() { try { deleteRow(getEntityId()); } catch (Exception ex) { throw new EJBException("ejbRemove: " + ex.getMessage()); } } public void EntityBeanProtocol .setEntityContext(EntityContext context) { this.context = context; setExtraContext(); } public void EntityBeanProtocol.unsetEntityContext() {} public void EntityBeanProtocol.ejbLoad() { try { loadEntity(); } catch (Exception ex) { throw new EJBException("ejbLoad: " + ex.getMessage()); } } public void EntityBeanProtocol.ejbStore() { try { storeEntity(); } catch (Exception ex) { throw new EJBException("ejbStore: " + ex.getMessage()); } } public void EntityBeanProtocol.ejbActivate() { setEntityId((String)context.getPrimaryKey()); } public void EntityBeanProtocol.ejbPassivate() { setEntityId(null); } // persistence protocol

ActionBazaar Administrative Component </web-resource-name> <url-pattern>/admin/*</url-pattern> </web-resource-collection> <auth-constraint> <role-name>CSR</role-name> </auth-constraint> </security-constraint>

When sending particular messages, we must assign a value to the property UserRole. The message selector will pick out the messages that meet its criteria and deliver them to the message-driven bean. Message selectors operate using the property values that are set in JMS messages. Any property that is set in the message can be examined by a message selector for filtering purposes. Message selection strings can be any length and any combination of message property comparisons. The following is an example of a more complex message selector: