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Using one or more security features in a product does not ensure security. For example, suppose a password is to be sent from a client to the server, and you do not want an attacker to be able to eavesdrop and see the password during transmission. You can take advantage of a security feature (say, encryption) to encrypt the password at the client before sending it to the server. If the attacker eavesdrops, what she will see is encrypted bits. Yet, taking advantage of a security feature, namely encryption, does not ensure that the client/server system is secure, since there are other things that could go wrong. In particular, encrypting the client s password does not ensure protection against weak passwords. The client may choose a password that is too short or easy for the attacker to obtain. Therefore, a system s security is not solely dependent upon the utilization of security features in its design, such as the encryption of passwords, but also depends on how it is used. Another example involves the interaction between a web client and a web server. You may decide to use SSL. SSL is the Secure Sockets Layer protocol that is used to secure communications between most web browsers and web clients. SSL allows the web client and web server to communicate over an encrypted channel with message integrity in which the client can authenticate the server. (Optionally, the server may also authenticate the client.) Our SimpleWebServer code can be modified to use an SSL connection instead of a regular one: import java.security.*; import javax.net.ssl.*; // ... some code excluded ... private static final int PORT = 443; private static SSLServerSocket dServerSocket; public SimpleWebServer () throws Exception { SSLServerSocketFactory factory = (SSLServerSocketFactory)SSLServerSocketFactory.getDefault(); dServerSocket = (SSLServerSocket)factory.createServerSocket(PORT);

public class HomeController : Controller { public ActionResult Index() { ViewData["Title"] = GetResource("PageTitle"); ViewData["Message"] = GetResource("WelcomeMessage"); return View(); } private string GetResource(string key) { var httpContext = ControllerContext.HttpContext; var culture = Thread.CurrentThread.CurrentUICulture; return (string)httpContext.GetGlobalResourceObject("Site", key, culture); } }

Listing 12-1 implements a simple drawing program using the GtkDrawingArea widget. Points will be drawn on the screen when the user clicks a mouse button and when the pointer is dragged while a button is clicked. A screenshot of this application can be viewed in Figure 12-1.

A localized resource file for Spanish (es-ES)

// ... some code excluded ... public void run () throws Exception { while (true) { /* Wait for a connection from a client. */ SSLSocket s = (SSLSocket)dServerSocket.accept(); // ... some code excluded ... } // ... some code excluded ...

Figure 12-1. A drawing area widget with text drawn with the mouse The current content of the drawing area s GdkWindow object is cleared when the user presses the Delete key. While this is a very simple program, it nonetheless shows how to interact with the GtkDrawingArea widget and use events with it.

Let s add another. We ll add one for the esES culture Spanish (Spain). To do this, add another resource file in App_GlobalResources, but this time we ll append the culture string to the filename in this case, Site.es-ES.resx. Figure 7.12 shows the contents of this file, and figure 7.13 shows the Solution Explorer view. We ve now added a second resource file that contains the same keys but the values are localized to the culture in question (in this case Spanish). Figure 7.14 shows what the site looks like when we run it. How did it know which culture we wanted to display How do Spanish-speaking users see the localized version In .NET, the current executing thread has a property called CurrentUICulture. We can set this programmatically, but most web browsers will do the work for us, provided we allow them.

Listing 12-1. A Simple Drawing Program (drawingareas.c) #include <gtk/gtk.h> #include <gdk/gdkkeysyms.h> static static static static gboolean gboolean gboolean gboolean button_pressed (GtkWidget*, GdkEventButton*, GPtrArray*); motion_notify (GtkWidget*, GdkEventMotion*, GPtrArray*); key_pressed (GtkWidget*, GdkEventKey*, GPtrArray*); expose_event (GtkWidget*, GdkEventExpose*, GPtrArray*);

Figure 7.14 Seeing the strings from the resource file live on the site. This browser is Mozilla Firefox with a custom skin.

s Note Some additional code is also required for the server to read a public key certificate as well as a

int main (int argc, char *argv[]) { GtkWidget *window, *area; GPtrArray *parray; gtk_init (&argc, &argv); window = gtk_window_new (GTK_WINDOW_TOPLEVEL); gtk_window_set_title (GTK_WINDOW (window), "Drawing Areas"); gtk_widget_set_size_request (window, 400, 300); g_signal_connect (G_OBJECT (window), "destroy", G_CALLBACK (gtk_main_quit), NULL); /* Create a pointer array to hold image data. Then, add event masks to the new * drawing area widget. */ parray = g_ptr_array_sized_new (5000); area = gtk_drawing_area_new (); GTK_WIDGET_SET_FLAGS (area, GTK_CAN_FOCUS); gtk_widget_add_events (area, GDK_BUTTON_PRESS_MASK | GDK_BUTTON_MOTION_MASK | GDK_KEY_PRESS_MASK); g_signal_connect (G_OBJECT (area), "button_press_event", G_CALLBACK (button_pressed), parray); g_signal_connect (G_OBJECT (area), "motion_notify_event", G_CALLBACK (motion_notify), parray); g_signal_connect (G_OBJECT (area), "key_press_event", G_CALLBACK (key_pressed), parray); g_signal_connect (G_OBJECT (area), "expose_event", G_CALLBACK (expose_event), parray);

Here we re using Mozilla Firefox, though all major browsers will allow you to do this. In Firefox, select Tools > Options > Content (tab) > Languages and you can choose your language preference. Figure 7.15 shows that we ve added Spanish (es-ES) to the list and moved it to the top. You ll also need the Web.config setting shown in listing 7.14.