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dynamic dx = new ExpandoObject(); dx.MyProperty = true; dx.AnotherProperty = 42;

Internet Explorer implements an extension to the HTTP Cookie specification that allows a web server to add an additional attribute, HttpOnly, to cookies that it sets in the user s browser When Internet Explorer receives a cookie with the HttpOnly attribute, it will not expose this cookie to client-side script (eg, in the documentcookie DOM property); rather, such a cookie will only be sent to the server as part of HTTP requests In case of an XSS attack against the web application, HTTP-only cookies cannot be accessed by the injected malicious script, and therefore cannot be sent to the attacker (for details, see the MSDN article Mitigating CrossSite Scripting with HTTP-Only Cookies, at http://msdnmicrosoftcom/workshop/author/ dhtml/httponly_cookiesasp) While setting the HttpOnly attribute for session cookies in many cases prevents traditional session hijacking (ie.

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If you set a property that the ExpandoObject didn t previously have, it just grows that as a new property, and you can retrieve the property later on. This behavior is conceptually equivalent to a Dictionary<string, object>, the only difference being that you get and set values in the dictionary using C# property accessor syntax, rather than an indexer. You can even iterate over the values in an ExpandoObject just as you would with a dictionary, as Example 18-18 shows.

foreach (KeyValuePair<string, object> prop in dx) { Console.WriteLine(prop.Key + ": " + prop.Value); }

If you are writing C# code that needs to interoperate with another language that uses the DLR, this class can be convenient languages that fully embrace the dynamic style often use this sort of dynamically populated object in places where a more statically inclined language would normally use a dictionary, so ExpandoObject can provide a convenient way to bridge the gap. ExpandoObject implements IDictionary<string, object>, so it speaks both languages. As Example 18-19 shows, you add properties to an ExpandoObject through its dictionary API and then go on to access those as dynamic properties.

ExpandoObject xo = new ExpandoObject(); IDictionary<string, object> dictionary = xo; dictionary["Foo"] = "Bar";

, scenarios in which an attacker obtains the victim s session cookies and uses them to access the victim s session with his own browser), you should not rely on this feature as your only protection mechanism against XSS attacks There are several reasons why HTTP-only cookies provide incomplete protection: The HttpOnly attribute is at this time only supported by Internet Explorer, but not other popular browsers Even with HttpOnly session cookies, XSS attacks with payloads that execute malicious actions directly within the user s browser are still possible For example, using HttpOnly would generally not prevent XSS worms from propagating If it is possible for an HTTP request to elicit a response that includes cookies sent as part of the request, injected script can extract HTTP-only session cookies from this response.

dynamic dyn = xo; Console.WriteLine(dyn.Foo);

This trick of implementing custom dynamic behavior is not unique to ExpandoObject we are free to write our own objects that do the same thing.

The DLR defines an interface called IDynamicMetaObjectProvider, and objects that implement this get to define how they behave when used dynamically. It is designed to enable high performance with maximum flexibility, which is great for anyone using your type, but it s a lot of work to implement. Describing how to implement this interface would require a fairly deep discussion of the workings of the DLR, and is beyond the scope of this book. Fortunately, a more straightforward option exists. The System.Dynamic namespace defines a class called DynamicObject. This implements IDynamicMetaObjectProvider for you, and all you need to do is override methods representing whichever operations you want your dynamic object to support. If you want to support dynamic properties, but you don t care about any other dynamic features, the only thing you need to do is override a single method, TryGetMember, as Example 18-20 shows.

using System; using System.Dynamic; public class CustomDynamic : DynamicObject { private static DateTime FirstSighting = new DateTime(1947, 3, 13); public override bool TryGetMember(GetMemberBinder binder, out object result) { var compare = binder.IgnoreCase StringComparer.InvariantCultureIgnoreCase : StringComparer.InvariantCulture; if (compare.Compare(binder.Name, "Brigadoon") == 0) { // Brigadoon famous for appearing only once every hundred years. DateTime today = DateTime.Now.Date; if (today.DayOfYear == FirstSighting.DayOfYear) { // Right day, what about the year int yearsSinceFirstSighting = today.Year - FirstSighting.Year; if (yearsSinceFirstSighting % 100 == 0) { result = "Welcome to Brigadoon. Please drive carefully."; return true; } } }

}

When recipients receive the e-mail, they are presented with the link displayed in Our Stuff. I sent the mashup to my personal Hotmail account, so I log in to Hotmail and lo and behold I have a message from myself (see Figure 6-26).

For example, the response to the HTTP TRACE method, which is supported by many popular web servers, includes a copy of all the original HTTP request s headers, including cookies Thus, if a web server supports TRACE, then session cookie hijacking is possible even if cookies are marked HttpOnly It is therefore recommended to disable TRACE requests (as well as other debug requests whose responses might contain cookies) in the web server configuration if HttpOnly is used..

}

return base.TryGetMember(binder, out result);

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