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Access to the Developers action will only be allowed to users in the admins or developers roles all other users (authenticated or not) will be issued a 401 response code and, using ASP.NET s forms authentication, will be redirected to the login page. Now that we ve seen a few examples of how AuthorizeAttribute is used, let s talk about how it works.

The type of curve. For example, types of curves are linear, spline interpolated, and freeform. Numbers that define the maximum x or y values. Numbers that define the minimum x or y values.

The ATM (automatic teller machine) card is another example of a security mechanism based on some secret the user has. On the back of an ATM card is a magnetic stripe that stores data namely the user s account number. This data is used as part of the authentication process when a user wants to use the ATM. However, ATM cards, unlike smart cards, are not tamper-resistant anyone who has a magnetic stripe reader can access the information stored on the card, without any additional information, such as a PIN. In addition, it is not very difficult to make a copy of an ATM card onto a blank magnetic stripe card. Since the magnetic stripe on an ATM card is so easy to copy, credit card companies also sometimes incorporate holograms or other hard-to-copy elements on the cards themselves. However, it s unlikely that a cashier or point-of-sale device will actually check the authenticity of the hologram or other elements of the card.

AuthorizeAttribute checks the IPrincipal associated with the current HttpContext. When Users or Roles is specified, it ensures the IPrincipal s username is in the allowed usernames or is a member of one of the granted roles. The AuthorizeAttribute can be used in a few ways:

max-x (max-y) min-x (min-y)

If AuthorizeAttribute is applied to a controller, it s applied to every action in that controller. If multiple AuthorizeAttributes are applied to an action, all checks occur and the user must be authorized by all of them. AuthorizeAttribute implements a special interface called IAuthorizationFilter. When applied to an action, an IAuthorizationFilter will execute before any other action filters, and before the normal result. Listing 11.4 shows the declaration of IAuthorizationFilter.

In general, the harder it is for an attacker to copy the artifact that the user has, the stronger this type of authentication is. Magnetic stripe cards are fairly easy to copy. Smart cards, however, are harder to copy because of their tamper-resistance features.

If set to TRUE, a separator will be placed between the dialog s GtkVBox widget and its action area.

public interface IAuthorizationFilter { void OnAuthorization(AuthorizationContext filterContext); }

If set to TRUE, the default widget for the window will be activated when the user presses the Enter key. An integer between 0 and 65,535 that defines the current cursor position within the GtkEntry widget. If set to TRUE, the user will be able to edit the content of the GtkEntry widget. If set to TRUE, a border will be placed around the widget. An object that defines spacing to add on all four sides of the text. When visibility is set to FALSE, this character will be shown instead of the actual text. This property is often used to implement password entries. The maximum length of text that the GtkEntry will accept; use 0 if there should be no limit. GtkEntry is only capable of handling strings up to 65,535 characters long. An integer describing the number of pixels of GtkEntry content that is scrolled off the left of the widget. The integer index of the other end of the selection from cursor-position in the number of characters. The current content of GtkEntry. If set to TRUE, when the user pastes text that spans multiple lines into a GtkEntry widget, only the first line will be inserted. If set to FALSE, all of the characters in the GtkEntry widget will be replaced by invisibility-char.

If you wanted to create your own filter attribute for authentication or authorization, you could implement the IAuthorizationFilter interface as an action filter and apply it to an action. AuthorizeAttribute does its security check in the OnAuthorization method, and sets the AuthorizationContext s Result property to HttpUnauthorizedResult the mechanism for returning the 401 status code. There are several other IAuthorizationFilter implementations in ASP.NET MVC; all are used to short-circuit the normal response to protect against undesired requests. 9 covered filters, and these five filters deal specifically with security: