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inding a lookup service involves a common series of steps, and convenience classes for encapsulating this were considered in the last chapter. Subsequent interaction with the discovered lookup services also involves common steps for services as they register with lookup services. A join manager encapsulates these additional steps into one convenience class for services.

If AuthorizeAttribute is applied to a controller, it s applied to every action in that controller. If multiple AuthorizeAttributes are applied to an action, all checks occur and the user must be authorized by all of them. AuthorizeAttribute implements a special interface called IAuthorizationFilter. When applied to an action, an IAuthorizationFilter will execute before any other action filters, and before the normal result. Listing 11.4 shows the declaration of IAuthorizationFilter.

Note: To learn more about making graphical Linux applications using the QT library, read Foundations of QT

public interface IAuthorizationFilter { void OnAuthorization(AuthorizationContext filterContext); }

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A service needs to locate lookup services and register the service with them. Locating services can be done using the utility classes from 12. As each lookup service is discovered, it then needs to be registered, and the lease needs to be maintained. The JoinManager class performs all of these tasks. There are two constructors: public class JoinManager { public JoinManager(Object obj, Entry[] attrSets, ServiceIDListener callback, DiscoveryManagement discoverMgr, LeaseRenewalManager leaseMgr) throws IOException; public JoinManager(Object obj, Entry[] attrSets, ServiceID serviceID, DiscoveryManagement discoverMgr, LeaseRenewalManager leaseMgr) throws IOException; public JoinManager(Object obj, Entry[] attrSets, ServiceIDListener callback, DiscoveryManagement discoverMgr, LeaseRenewalManager leaseMgr, Configuration config) throws IOException, ConfigurationException; public JoinManager(Object obj, Entry[] attrSets,

Development by Johan Thelin, (Apress, 2007).

If you wanted to create your own filter attribute for authentication or authorization, you could implement the IAuthorizationFilter interface as an action filter and apply it to an action. AuthorizeAttribute does its security check in the OnAuthorization method, and sets the AuthorizationContext s Result property to HttpUnauthorizedResult the mechanism for returning the 401 status code. There are several other IAuthorizationFilter implementations in ASP.NET MVC; all are used to short-circuit the normal response to protect against undesired requests. 9 covered filters, and these five filters deal specifically with security:

Figure 17-6. The graphical interface for kernel configuration The left panel contains the main configuration sections and their subsections. Selecting an item from the left pane will either open a subsection or display the available features you can select, in the right pane. The lower right pane contains the description of the currently selected item, which is highlighted. Selected kernel features can take on three forms, as shown in Figure 17-7. A blank checkbox means that the kernel feature is not to be included in any way during the kernel compilation. A checked box will include the kernel feature within the kernel, and not as a loadable module. A circle in a box will compile the kernel feature as a loadable module that you can load and unload. You can cycle through these selections by clicking the checkbox.

Cross-site scripting (XSS)

ServiceID serviceID, DiscoveryManagement discoverMgr, LeaseRenewalManager leaseMgr, Configuration config) throws IOException, ConfigurationException; } The first constructor is used when the service is new and does not have a service ID. A ServiceIDListener can be added to note and save the ID. The second constructor is used when the service already has an ID. The other parameters are for the service and its entry attributes, a DiscoveryManagement object to set groups and unicast locators (typically this will be done using a LookupDiscoveryManager), and a lease renewal manager. The third and fourth constructors add a Configuration parameter to the first and second constructors, respectively. The following example uses the first constructor to register a FileClassifierImpl. There is no need for a DiscoveryListener, since the join manager adds itself as a listener and handles the registration with the lookup service. Note that a proxy has to be created using an Exporter, and then the proxy is passed as the first parameter to the JoinManager. package joinmgr; import rmi.FileClassifierImpl; import net.jini.lookup.JoinManager; import net.jini.core.lookup.ServiceID; import net.jini.discovery.LookupDiscovery; import net.jini.core.lookup.ServiceRegistrar; import java.rmi.RemoteException; import net.jini.lookup.ServiceIDListener; import net.jini.lease.LeaseRenewalManager; import net.jini.discovery.LookupDiscoveryManager; import net.jini.discovery.DiscoveryEvent; import net.jini.discovery.DiscoveryListener; import java.rmi.RMISecurityManager; import java.rmi.Remote; import net.jini.config.*; import net.jini.export.*; /** * FileClassifierServer.java */ public class FileClassifierServer implements ServiceIDListener { // explicit proxy for Jini 2.0 protected Remote proxy; protected FileClassifierImpl impl; private static String CONFIG_FILE = "jeri/file_classifier_server.config"; public static void main(String argv[]) { new FileClassifierServer(); // stay around forever

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