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CHAPTER 5 .NET 2.0 SECURITY
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Cookieless Authentication Support under ASP.NET 2.0
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The next attribute of interest is cookieless. To understand the impact of this attribute, realize that ASP .NET 1.x s implementation of forms authentication was dependant upon cookies (in fact, the second parameter supplied to FormsAuthentication.RedirectFromLoginPage is a Boolean used to enable or disable a persistent cookie). The obvious limitation is that you cannot guarantee that the target browser will support cookies. To address this issue, ASP .NET 2.0 now supports a cookieless manner to handle the authentication ticket, which is consistent with the frameworks support for cookieless sessions. Specifically, the cookieless attribute may be assigned to any of the following values (see Table 5-4). Table 5-4. Settings of the cookieless Attribute Cookieless Attribute Setting
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UseCookies
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Specifies that your Web program will always use cookies to represent the authentication ticket (e.g., you are emulating ASP.NET 1.1). Specifies that your Web program will never use cookies to represent the authentication ticket. Enables or disables cookie support based on dynamically discovering the settings of the client browser. This is the default setting. If the browser has the capability to support cookies (regardless of if the user has disabled cookies) a cookie will be used. Unlike AutoDetect, no dynamic discover step is taken.
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UseUri AutoDetect UseProfileDevice
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For most ASP .NET web applications, the default value of UseProfileDevice will be sufficient. If you re required to support users who disable their cookies, AutoDetect is a nice option because it will use cookies for those that have them enabled, and only those users with support disabled will have their URLs modified. This feature is also cross browser-compatible. Also realize that the difference between UseProfileDevice and AutoDetect is this: UseProfile device determines if the browser supports cookies, which browsers mostly have for the last eight years or so. However, a user can have a browser that supports cookies, but the user still chooses to turn off support for cookies. AutoDetect must be used to detect this user specific setting within the browser. For the sake of illustration, here is a web.config file that explicitly prevents the use of cookies to represent the authentication ticket: <authentication mode="Forms"> <forms loginUrl ="Logon.aspx" name ="WebEntryPoint" cookieless ="UseUri"/> </authentication> Now that you know how to disable (or enable) cookies for purposes of user authentication, you may be wondering how ASP .NET 2.0 will maintain the authentication ticket when cookies are not used. Again, given that cookieless authentication mimics the model used for
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CHAPTER 5 .NET 2.0 SECURITY
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cookieless sessions, the answer is that the encrypted ticket is packed into the URL. Thus, if you updated your web.config file as shown previously, you would find a URL something like the following upon successful validation (the embedded ticket is shown in bold): http://localhost:1096/Asp_Authentication/(F(xWbfAoTTWrBjxrBTqlZdIxO45Sikcm2AFdU3mOa5N76bpAkpDxNVsb5vspUzUzkdt0e3xrw5Q4up5F0VpHUA2))/default.aspx
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Details behind the <authorization> Element
As you see in the current web.config file, the <authorization> element may contain an <allow> subelement to control who can access a particular resource. Additionally, the <authorization> element can contain a <deny> subelement to explicitly deny access to a particular resource. The <allow> and <deny> subelements each support a users attribute that can be assigned to the token (to specify anonymous users) as well as * (to specify all users). In its simplest form, the <authorization> element has the following skeleton: <authorization> <allow users=" | *"/> <deny users=" | *"/> </authorization> If you so choose, the users attribute can contain a comma-delimited set of known users and/or roles recognized by the Win32 SAM or Active Directory. While specifying a set of individual users or groups for a publicly accessible site may seem odd, we are sure you can imagine a subset of your website that should only be accessed by a known set of users. For example, assume you have a subdirectory of your site that contains a number of configuration utilities for your site. If you were to include a new web.config file for that directory, you could enable Windows authentication and specify that nobody outside the role of "Admins" should be able to access the contained content. (Notice that the <allow> element is now making use of the roles attribute rather than the more specific users attribute.) <configuration> <system.web> <authorization> <allow roles="Admins"/> <deny users="*"/> </authorization> </system.web> </configuration> In addition to supporting roles and users, the <allow> and <deny> elements can be further qualified using a set of verbs. Simply put, the optional verbs attribute enables you to specify which form(s) of HTTP transmission are allowed to access the specified resource. ASP .NET 2.0 honors the following verb values:
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