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Since ViewState contains a collection of serialized objects that will be reconstituted on the server, it presents the possibility of abuse, including hacking and denial-of-service attacks. To prevent tampering and help ensure data integrity, the runtime can generate a message authentication code (MAC). The runtime can also encrypt the field in the event you need to use it to store sensitive data. The default setting for ViewState validation uses the SHA-1 algorithm to generate a MAC, with an automatically generated validationKey. Using the MD5 algorithm instead is a little faster and generates

5. 6.

a few less bytes in your pages. The extra cryptographic strength of SHA-1 would reduce the chances (very slightly) that an attacker could find some other random string that would result in the same hash code, but that s not something that you care about in this case; protecting against injection of arbitrary text is more important, and MD5 does that just fine. In an environment with multiple web servers, be sure to configure the validationKey to be the same on all servers. Otherwise, with the default automatically generated keys, ViewState generated on one server will not be valid on other servers, since the MACs would be different. Even in single-server environments, it s a good practice to set a specific validationKey. That helps avoid surprises down the road, including things such as inadvertently invalidating form-containing web pages that are cached by search engines in the event you move to a new server or reload the operating system. Here are the relevant settings in web.config: <system.web> . . . <pages enableViewStateMac="true"> . . . </pages> <machineKey validationKey="50B3847462938741422FF158A5B42D0E8DB8CB5CDA174257" validation="MD5" /> </system.web> The validationKey is a random hex string, between 40 and 128 characters long. You should generally not require site-wide encryption of ViewState. If you need to store sensitive information in ViewState, you can encrypt it separately. If you need to protect the structure of the objects, then you can write a custom serializer, or you can serialize into memory first and encrypt the result.

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The result is a ListView with icons down the left side. In particular, all the icons are the same, as Figure 9-1 shows.

To understand more thoroughly how ViewState works and how to avoid several potential pitfalls, I ve found that it s helpful to cover a few security-oriented applications. For example, you can use ViewState to prevent one-click attacks. The way they usually work is that an attacker creates HTML that includes a form and a link, which, when clicked, submits the form to the server being attacked. The form might do something like register a new user that the attacker will subsequently use to spam the target site. The power of the technique stems from the forms being submitted from IP addresses that aren t directly associated with the attacker. The HTML is often sent to third parties using e-mail, along with socially engineered link text, such as click here to claim your prize. One way to use ViewState to prevent one-click attacks is to set the ViewStateUserKey property on a Page. That value is stored in ViewState when the runtime initially renders the page. Then, during a postback, the runtime checks the stored field to make sure that it s equal to the current ViewStateUserKey. If it isn t, then the runtime throws an exception, and the page is aborted. You should choose ViewStateUserKey so that it is unique per user. Here s an example that sets the user s IP address as the key (see view2.aspx): protected void Page_Init(object sender, EventArgs e) { this.ViewStateUserKey = Request.UserHostAddress; }

Right-click the model, and from the drop-down menu select Volume. The Volume Parameters dialog box will appear (Figure 5 10). To calculate the volume of the cube, select Units as cu.ft, because you will be using cubic feet. The Layer option lets you choose the layer, Hide Edges presents you with the edges, and Color allows you to set the desired color for the job.

The result is that the __VIEWSTATE hidden field will be different for each different IP address, and users who submit the form from an IP address that s different from the one that the containing page was originally sent to will receive an error. That prevents attackers from copying the hidden field from one form and using it in a one-click attack.

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