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When a user enters credentials for forms authentication, the credentials are sent from the browser to the server in plain-text format. This means anyone intercepting them will be able to read them. This is obviously an insecure situation. The usual solution to this problem is to use SSL (as described in the previous chapter). Now, a valid argument might be that you just need to use SSL for securing the login page, not the entire application. You can configure forms authentication to encrypt and sign the cookie, and therefore it s extremely difficult for an attacker to get any information from it. In addition, the cookie should not contain any sensitive information and therefore won t include the password that was used for authentication. But what if the attacker intercepts the unencrypted traffic and just picks the (already encrypted) cookie and uses it for replay The attacker doesn t need to decrypt it; she just needs to send the cookie with her own request across the wire. You can mitigate such a replay attack only if you run the entire website with SSL. Other authentication mechanisms don t require this extra work. With Windows authentication, you can use a protocol that automatically enforces a secure login process (with the caveat that this is not supported by all browsers and all network environments). With Passport authentication, the login process is handled transparently by the Passport servers, which always use SSL.

Cookie authentication is, on the surface, a fairly straightforward system. You might wonder why you shouldn t just implement it yourself using cookies or session variables. The answer is the same reason developers don t implement features in ASP .NET ranging from session state to the web control framework. Not only does ASP .NET save you the trouble, but it also provides an implementation that s secure, well tested, and extensible. Some of the advantages provided by ASP.NET s implementation of forms authentication include the following: The authentication cookie is secure. Forms authentication is a well-tested system. Forms authentication integrates with the .NET security classes.

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Cookie authentication seems simple, but if it s not implemented correctly, you can be left with an insecure system. On their own, cookies are not a safe place to store sensitive information, because a malicious user can easily view and edit cookie data. If your authentication is based on unprotected cookies, attackers can easily compromise your system. By default, the forms authentication module encrypts its authentication information before placing it in a cookie. It also attaches a hash code and validates the cookies when they return to the server to verify that no changes have been made. The combination of these two processes makes these cookies very secure and saves you from needing to write your own security code. Most examples of homemade cookie authentication are far less secure.

Forms authentication is an integral part of ASP.NET, so it has already been used in a number of web applications and websites. Because so many people use the same system, flaws are quickly discovered, publicized, and solved. As long as you keep up-to-date with patches, you have a high level of

Since requests are spawned outside the control of any application code, signals are used to inform application code of the beginning and completion of all request/response cycles. Like all signals, these are simply objects, and they live at . For more information on signals, how they work and how to use them, refer to 9.

protection. On the other hand, if you create your own cookie authentication system, you do not have the advantage of this widespread testing. The first time you ll notice a vulnerability will probably be when your system is compromised.

All types of ASP.NET authentication use a consistent framework. Forms authentication is fully integrated with this security framework. For example, it populates the security context (IPrincipal) object and user identity (IIdentity) object, as it should. This makes it easy to customize the behavior of forms authentication.

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