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15.6.5. Securing Entities

Seam Security also lets you apply security restrictions to certain actions (read, insert, update, and delete) for entities.
To secure all actions for an entity class, add a @Restrict annotation on the class itself: 
@Entity
@Name("customer")
@Restrict
public class Customer {
  ...
}
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If no expression is specified in the @Restrict annotation, the default action is a permission check of entity:action, where the permission target is the entity instance, and the action is either read, insert, update or delete.
You can also restrict certain actions by placing a @Restrict annotation on the relevant entity life cycle method (annotated as follows):
  • @PostLoad — Called after an entity instance is loaded from the database. Use this method to configure a read permission.
  • @PrePersist — Called before a new instance of the entity is inserted. Use this method to configure an insert permission.
  • @PreUpdate — Called before an entity is updated. Use this method to configure an update permission.
  • @PreRemove — Called before an entity is deleted. Use this method to configure a delete permission.
The following example shows how an entity can be configured to perform a security check for any insert operations. Note that the method need not perform any action; it is only important that it be annotated correctly: 
@PrePersist 
@Restrict 
public void prePersist() {}
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Note

You can also specify the callback method in /META-INF/orm.xml: 
<?xml version="1.0" encoding="UTF-8"?>
<entity-mappings xmlns="http://java.sun.com/xml/ns/persistence/orm"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="
          http://java.sun.com/xml/ns/persistence/orm 
          http://java.sun.com/xml/ns/persistence/orm_1_0.xsd"
          version="1.0">

  <entity class="Customer">
    <pre-persist method-name="prePersist" />
  </entity>

</entity-mappings>
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You will still need to annotate the prePersist() method on Customer with @Restrict.
The following configuration is based on the Seamspace example, and checks if the authenticated user has permission to insert a new MemberBlog record. The entity being checked is automatically inserted into the working memory (in this case, MemberBlog): 
rule InsertMemberBlog
  no-loop
  activation-group "permissions"
when
  principal: Principal()
  memberBlog: MemberBlog(member : member -> 
                        (member.getUsername().equals(principal.getName())))
  check: PermissionCheck(target == memberBlog, 
                         action == "insert", granted == false)
then
  check.grant();
end;
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This rule grants the permission memberBlog:insert if the name of the currently authenticated user (indicated by the Principal fact) matches that of the member for whom the blog entry is being created. The principal: Principal() structure is a variable binding. It binds the instance of the Principal object placed in the working memory during authentication, and assigns it to a variable called principal. Variable bindings let the variable be referenced in other places, such as the following line, which compares the member name to the Principal name. For further details, refer to the JBoss Rules documentation.
Finally, install a listener class to integrate Seam Security with your JPA provider.

15.6.5.1. Entity security with JPA
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Security checks for EJB3 entity beans are performed with an EntityListener. Install this listener with the following META-INF/orm.xml file: 
<?xml version="1.0" encoding="UTF-8"?>
<entity-mappings xmlns="http://java.sun.com/xml/ns/persistence/orm"
                 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
                 xsi:schemaLocation="
                   http://java.sun.com/xml/ns/persistence/orm 
                   http://java.sun.com/xml/ns/persistence/orm_1_0.xsd"
                 version="1.0">

  <persistence-unit-metadata>
    <persistence-unit-defaults>
      <entity-listeners>
        <entity-listener 
                class="org.jboss.seam.security.EntitySecurityListener"/>
      </entity-listeners>
    </persistence-unit-defaults>
  </persistence-unit-metadata>

</entity-mappings>
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