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Securing JavaServer Faces Applications
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FIGURE 15-7 Java authorization classes
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A production-quality implementation will want to extend Permission directly and provide robust behavior for view ID pattern matching The listing for ViewIdPermission follows
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public class ViewIdPermission extends BasicPermission { public ViewIdPermission(String viewId) { super(viewId); } public ViewIdPermission(String viewId, String actions) { super(viewId, actions); } }
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You can see that this subclass adds no value over the BasicPermission class and is included here mainly to show where a production implementation would extend The valid principal types, and the permissions each one has, are defined in a policy file declared to the VM in a similar manner to the way the login configuration was declared earlier, via a -D option, or via modifying the javasecurity file As in the previous, we choose the former option
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-Djavasecurityauthpolicy== D:/Projects/trainer/chapterCode/ch14/trainer/web/WEB-INF/trainerpolicy
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The format of the file is defined by JAAS:
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grant Principal comtagishauthTypedPrincipal "trainer" { permission comjsfcompreftrainercomponentsutilViewIdPermission "*"; };
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Applying JavaServer Faces
grant Principal comtagishauthTypedPrincipal "user" { permission comjsfcompreftrainercomponentsutilViewIdPermission "/mainjsp"; };
The preceding policy file defines two Principals, trainer and user , and grants some ViewIdPermissions to each The trainer is allowed to access any view ID as indicated by the * declaration The user is only allowed to access the /mainjsp view ID Note that we don t need to list the login and logout view IDs because they are explicitly excluded from the authorization scheme by the JAASActionListener implementation The limitation of our simple ViewIdPermission implementation is evident here because we have to modify this policy file to explicitly grant the user access to any view IDs they must view Once the Principals and Permissions have been defined and declared, the JAASActionListener and JAASHelper classes must be extended to use them First, let s rewrite the processAction( ) method to include this feature
public void processAction(ActionEvent event) throws AbortProcessingException { FacesContext context = FacesContextgetCurrentInstance(); UIOutput comp = null; String userid = null, password = null; JAASHelper jaasHelper = new JAASHelper(); // Check to see if they are on the login page boolean onLoginPage = (-1 != contextgetViewRoot()getViewId() lastIndexOf("login")) true : false; if (onLoginPage) { if (null != (comp = (UIOutput) contextgetViewRoot()findComponent("form:userid"))) { userid = (String) compgetValue(); } if (null != (comp = (UIOutput) contextgetViewRoot()findComponent("form:password"))) { password = (String) compgetValue(); } // If JAAS authentication failed if (!jaasHelperauthenticate(userid, password)) { contextgetApplication()getNavigationHandler() handleNavigation(context, null, "login"); return; } else { // Subject must not be null, since authentication succeeded assert(null != jaasHelpergetSubject()); // Put the authenticated subject in the session contextgetExternalContext()getSessionMap()put(JAASSubject, jaasHelpergetSubject()); } } parentprocessAction(event); // use JAAS to perform viewId level authorization // The ForcedLoginPhaseListener already forced the user to log in // before reaching this page Subject subject = (Subject) contextgetExternalContext()
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Securing JavaServer Faces Applications
getSessionMap()get(JAASSubject); assert(null != subject); // If the user doesn t have permission to view this viewId if (!jaasHelperhasPermissionToAccessViewId(subject, context getViewRoot()getViewId())) { // Redirect to the insufficientPermissions page contextgetApplication()getNavigationHandler() handleNavigation(context, null, "insufficientPermissions"); } }
The first part of the method is unchanged from the previous section We have added code after the parentprocessAction(event) call to handle authorization First, the Subject is retrieved from the session Then, the static hasPermissionToAccessViewId( ) method is called on JAASHelper, passing the Subject and the view ID If hasPermissionToAccessViewId( ) returns false, we navigate to the insufficientPermissions outcome using the handleNavigation( ) method of NavigationHandler Note that the last argument to the handleNavigation( ) is hard-coded to the value insufficientPermissions This constitutes an implicit usage contract requirement in the necessity of the user to declare an insufficientPermissions navigationrule outcome and associated JSP page to show when the user doesn t have permission to access the given view ID Let s now examine the implementation of hasPermissionToAccessViewId( )
public static boolean hasPermissionToAccessViewId(Subject subject, String viewId) { boolean result = true; final Permission perm = new ViewIdPermission(viewId); final SecurityManager sm; if (SystemgetSecurityManager() == null) { sm = new SecurityManager(); } else { sm = SystemgetSecurityManager(); } try { SubjectdoAsPrivileged(subject, new PrivilegedExceptionAction() { public Object run() { smcheckPermission(perm); return null; } },null); result = true; } catch (AccessControlException ace) { result = false; } catch (PrivilegedActionException pae) { result = false; }
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