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attempt to access Login.aspx without SSL, it s better to detect unsecure connections in code and redirect accordingly. This means that users trying to access Login.aspx without SSL are automatically redirected to the same page, but with SSL. Similarly, we want users attempting to use SSL to access a page such as Default.aspx which doesn t need to be secured to be redirected to a non-SSL connection to the same page. This results in a seamless experience for users. We ll look at this in more detail in a moment. First, however, it s worth mentioning an attribute that ASP.NET supplies for use with the <forms> definition in web.config. You can set the attribute requireSSL to true for this element, which will prevent user login cookies from being exchanged over a non-SSL connection. However, this enforces the requirement that, once logged in, users can only be authenticated for pages viewed over SSL. This setting does not prevent users from looking at pages such as Default.aspx over a standard HTTP connection. However, user-aware controls (such as UserInfo.ascx in BalloonShop) will not have access to user information unless SSL is used. This attribute is for use only when you are happy to enforce SSL connections site-wide. Because SSL connections introduce a performance hit due to the encryption and decryption required, this isn t recommended for most web sites.

One way to enforce SSL connections is to use absolute URLs everywhere a link is used on the site, using for example https://<server>/CustomerDetails.aspx for the Edit Details link in UserInfo.ascx and the http:// protocol for most other links. If you did this in combination with SSL enforcement in IIS, you could prevent users from accessing secured pages quite effectively. If they tried rewriting the URL by hand, they would likely end up with an error message because IIS prevents secured pages from being transmitted via HTTP. However, this involves a lot of work to modify and maintain links, and we have a far more elegant technique at our disposal. The core concept behind the technique presented here is that every page bar none uses a Master Page. This Master Page is either BalloonShop.master or Admin.master. We want to force pages using Admin.master to always use SSL, and force pages using BalloonShop.master to sometimes use SSL, where the sometimes translates as where specified by the page. The simplest of these, Admin.master, requires the following code in Admin.master.cs: protected override void OnInit(EventArgs e) { if (!Request.IsSecureConnection) { Response.Redirect(Request.Url.AbsoluteUri.ToLower().Replace( "http://", "https://"), true); } base.OnInit(e); } Here you detect whether an SSL connection is in use with Request.IsSecureConnection, and if it isn t, redirect to a page with the same URL as the current page, but starting with https rather than http. You do this at the OnInit stage of the page life cycle; that is, before the page has had a chance to do much processing that would be wasted. Similarly, in BalloonShop.master.cs, you redirect to an SSL connection if required or to a standard HTTP connection if SSL isn t required. This prevents other, nonsecured pages in the

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protected void onListItemClick(ListView l, View v, int position, long id) { String url=getString(EU.get(position).url); if (browser==null) { startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse(url))); } else { browser.loadUrl(url); } }

Figure 5-6. The pinouts for the L293D (or SN754410)

site from being accessed via SSL when not required. To control this redirection, you include a property that pages using BalloonShop.master can set, saying whether they require SSL or not. This property, EnforceSSL, is defined as follows: public bool EnforceSSL { get { if (ViewState["enforceSSL"] != null) { return (bool)ViewState["enforceSSL"]; } else { return false; } } set { ViewState["enforceSSL"] = value; } } We use view state here to streamline things, but other than that, this is a simple Boolean property. Now, because this property may be set fairly late in the life cycle of the Master Page, you can t act on it in OnInit. Instead, you check the value of this property in OnPreRender and redirect then (if necessary): protected override void OnPreRender(EventArgs e) { if (EnforceSSL) { if (!Request.IsSecureConnection) { Response.Redirect( Request.Url.AbsoluteUri.ToLower().Replace( "http://", "https://"), true); } } else if (Request.IsSecureConnection) { Response.Redirect(Request.Url.AbsoluteUri.ToLower().Replace( "https://", "http://"), true); } } With this scheme, the user is only aware that something is going on when logging in. At this point the user is redirected from a secure to a nonsecure connection. From that point on,

Summary

Figure 36 9. EU4You, landscape WVGA (800x480 pixels), set for normal density, and showing the embedded WebView

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