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Recipe
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To discover the EJB client s identity, use the security methods from the EJBContext instance set inside your EJB:
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java.security.Principal principal = ejbContext.getCallerPrincipal(); System.out.println( "User name is: " + principal.getName() ); boolean inAdminRole = ejbContext.isCallerInRole( "ADMIN" );
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Discussion
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Whether you are implementing methods inside an entity or session bean, the EJB container will provide you with an object that implements the EJBContext interface. Session beans will receive a SessionContext instance. Entity beans will receive an EntityContext instance. Since both instances implement the EJBContext interface, you can invoke the two methods shown in the recipe in both session and entity beans. The getCallerPrincipal() method returns the Principal object associated with the caller of your EJB s method. With the Principal object, you can acquire the name of the invoker by using the Principal class s getName() method. The isCallerInRole() method allows you to query the container for information about the caller s roles. For instance, the recipe is questioning whether the caller is in the ADMIN role. You can use this method to perform different implementations of an operation based on the role of the caller.
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7.2 Assigning and determining EJB client security roles 7.3 Passing client credentials to the EJB container 7.4 Disabling methods for certain users
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7.2 Assigning and determining EJB client security roles
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You want to assign logical roles to a client, and EJBs need to determine client roles at runtime.
Background
In recipe 7.1, we showed how an EJB can determine the caller s identity (the username, for instance) and make informed decisions. In EJB applications, the application server has the ability to map a set of users to a logical role. By placing users into roles, you can programmatically assign permissions. For instance, you can limit application functionality based on the client s role.
Recipe
To determine the client s role, use a method from the EJBContext instance set inside your EJB:
boolean inAdminRole = ejbContext.isCallerInRole( "Administrator" );
To create a logical role, use the <security-role> tag within the assembly descriptor section of the ejb-jar xml file:
<ejb-jar> <enterprise-beans> <entity> <!-- Bean data here --> <security-role> <description> The admin role </description> <role-name> ADMIN </role-name> </security-role> </entity> </enterprise-beans>
Assigning and determining EJB client security roles
<assembly-descriptor > </assembly-descriptor> </ejb-jar>
Finally, you must reference this role for a particular EJB. You should place the following within the bean section of the deployment descriptor; it creates a logical role used by the EJB and maps it to a logical role in the assembly descriptor:
<security-role-ref> <description> Users with this role are in the Administrators group </description> <role-name> Administrator </role-name> <role-link> ADMIN </role-link> </security-role-ref>
Discussion
As stated in the chapter introduction, security roles are a declarative method of setting up client boundaries around an EJB. The <security-role> element of the assembly descriptor sets up logical roles used to group EJB clients. The <securityrole-ref> element maps logical roles used by an EJB to a security role defined in the assembly descriptor or in the runtime environment. For instance, the recipe sets up a runtime role ADMIN and links it to users of the bean with the Administrator role. The <role-link> tag is optional for the <security-role-ref> element, but if it is not provided to map to a <security-role> in the assembly descriptor, it must be mapped to a role in the runtime environment (see your vendor documentation). The logical roles set up in the deployment descriptor are just that: logical roles. They are only labels declared before runtime. Each role must be mapped to an existing security realm in the runtime environment. Again, this important step will differ across vendors, and you should consult your documentation for the exact process. The isCallerInRole() method is used to determine the appropriate action of a method. Take the following implementation of a business method:
public void performImportantAction() throws NotAdminException { boolean isAdmin = ejbContext.isCallerInRole( "ADMIN" ); if( isAdmin ) //perform the important function
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