zxing.net code 128 Figure 10.5 IntelliSense in our Spark views is possible because of the Visual Studio add-in. in VS .NET

Printing Code 128C in VS .NET Figure 10.5 IntelliSense in our Spark views is possible because of the Visual Studio add-in.

Figure 10.5 IntelliSense in our Spark views is possible because of the Visual Studio add-in.
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Our running Spark application
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The decision to choose a different view engine is still quite important, because it has long-term technical and nontechnical ramifications. Alternative view engines should be another option to investigate for MVC applications, because they offer compelling alternatives to the default WebFormViewEngine.
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10.4 Summary
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With the release of ASP.NET MVC 2 came several more options for organizing content in our views. Child actions moved from the MVC Futures assembly to being first-class citizens, and the addition of templates has allowed us to build standardized content in our views. With master pages, partials, child actions, templates, and HtmlHelper extensions, we have many options for rendering our views beyond just a single page. Each has its sweet spot, and we can be assured that any duplication we encounter in our views can be easily addressed. The only question is how we want to address it. A querystring parameter builder is one of these ways. Because of the extensibility of ASP.NET MVC, we can also swap out our view engine without affecting our controllers. The Spark view engine, optimized for code in markup, is a viable alternative to some of the ugliness that comes with mixing C# and markup in the traditional Web Forms view engine. In the next chapter, we ll take a look at securing our MVC applications.
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Security
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This chapter covers
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Requiring authentication and authorization Preventing cross-site scripting attacks Mitigating cross-site request forgeries Avoiding JSON hijacking
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Security is often a vague and amorphous topic in web application development. We rely on the web server to keep our application secure, and we rely on our programming platform. The rest sometimes seems theoretical and rare. In this chapter, we ll describe possible attacks and exactly what to do to prevent them by using two main approaches. The first is traditional management of authentication and authorization. Authentication is ensuring that the user has supplied the proper credentials to access the system. When a user logs in, usually by providing a username and password, he is authenticated. Authorization is making a decision about whether a given user has permission to do something with the system. When a user accesses a resource not available to other users, he has been specifically authorized to do so. The second approach we ll discuss involves common web attack vectors and technical vulnerabilities that allow attackers to bypass authentication or authorization.
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Authentication and authorization
There are several attack vectors, but we ll focus on some common ones: cross-site scripting (XSS), cross-site request forgery (XSRF), and a special cross-site request forgery called JSON hijacking.
11.1 Authentication and authorization
ASP.NET MVC 2 ships with a filter attribute called AuthorizeAttribute that provides
out-of-the-box authentication and authorization. Developers can apply the attribute to actions to restrict access to them. If the user isn t permitted to access the action, the AuthorizeAttribute will transmit an HTTP status code of 401 Unauthorized to the browser, indicating that the request has been refused. Applications using ASP.NET s forms authentication mechanism and with a login page specified in Web.config will then redirect the browser to the login page, and users may only proceed once they have been authenticated.
11.1.1 Requiring authentication with AuthorizeAttribute The simplest use of AuthorizeAttribute, shown in listing 11.1, only requires that the current user be authenticated.
Listing 11.1 Authentication with AuthorizeAttribute
[Authorize] public ActionResult About() { return View(); }
When this action is requested by an unauthenticated user, AuthorizeAttribute, applied to the About action B, will prevent access to it.
11.1.2 Requiring authorization with AuthorizeAttribute To restrict an action further, developers can specify users or roles that AuthorizeAttribute requires. These roles or users are passed to the attribute using a commadelimited list of strings containing either the usernames or the roles allowed. Listing 11.2 shows the AuthorizeAttribute syntax for requiring a specific user.
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