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Authorization entails applying security policies to regulate what specific users, or groups of users, can access in the system. An access control limits the resources a user has access to according to that user s permissions. Access control can also be used to limit the type of access a user has to a resource, such as read or write access. Two approaches can be used to define access control rules: the capabilities are examined to focus on what a caller can do, and permissions focus on who can do what. The JEE application programming model focuses on permissions.
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With declarative authorization, the container-enforced access control rules associated with a JEE application are established by the deployer. The deployer uses a deployment tool to map an application permission model to policy specific to the operational environment. The application permission model is contained in a deployment descriptor. The deployment descriptor defines logical privileges, called security roles, and associates them with components to define the privileges required to be granted permission to access components. The deployer assigns these logical privileges to specific callers to establish the capabilities of users in the runtime environment. Callers are assigned logical privileges based on the values of their security attributes. The EJB container grants permission to access a method to callers that have at least one of the privileges associated with the method. Security roles also protect web resource collections that is, a URL pattern and an associated HTTP method, such as GET. The web container enforces authorization requirements similar to those for an EJB container. Note that when a resource has no associated security role, permission to access the resource will be granted to all. In both tiers, access control policy is defined at deployment time, rather than application development. The deployer can modify the policy provided by the application assembler. The deployer refines the privileges required to access the components and defines the correspondence between the security attributes presented by callers and the container privileges. In any container, the mapping from security attributes to privileges is scoped to the application, so that the mapping applied to the components of one application may be different from that of another application. With programmatic authorization, a JEE container makes access control decisions before dispatching method calls to a component. As a result, the state of a component doesn t affect the access decisions. A component can use two methods, EJBContext.isCallerInRole for enterprise bean code and HttpServletRequest.isUserInRole for web components. A component uses these methods to determine whether a caller has been granted a privilege selected by the component, basing its choice on the parameters, the state of the component, or factors such as the time of the call. The application component provider of a component that calls one of these functions must declare the complete set of distinct roleName values used in all of its calls. These declarations appear in the deployment descriptor as securityrole-ref elements. Each security-role-ref element links a privilege name embedded in the application as a roleName to a security role. It is ultimately the deployer that establishes the link between the privilege names embedded in the
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4: Applicability of JEE Technology
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application and the security roles defined in the deployment descriptor. The link between privilege names and security roles may differ for components in the same application. Use declarative authorization where possible and programmatic authorization when more functionality is required. When using declarative authorization, ensure that access control is not bypassed. Apply the same access control rules to all the methods in a component. There is a trade-off between the external access control policy configured by the deployer and the internal policy embedded in the application code. The former is flexible after the application has been written. The latter provides more options in terms of functionality. The former is transparent and completely comprehensible. The latter is hidden in the application code and may be understood only by the application developers. These trade-offs should be considered in choosing the authorization model.
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