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Granting Privileges Beyond the Trust Level
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What if one of the tasks to perform requires privileges that the trust level doesn t grant There are two basic approaches. The simplest approach is to customize the policy file for the trust level and add any permissions you need. The solution is easy to implement and doesn t require code changes. It does require administrator rights to edit the security policy files. From a pure security perspective, it is not a great solution because you re just adding to the whole application the permissions you need for a particular method of a particular page or assembly. The second approach requires a bit of refactoring but leads to better and safer code. The idea is to sandbox the server-side code and make it delegate to external components (for example, serviced components or command-line programs) the execution of any tasks that exceed the application s permission set. Obviously, the external component will be configured to have all required permissions. Note Code sandboxing is the only option you have if your partially trusted ASP.NET application is trying to make calls into an assembly that doesn t include the AllowPartiallyTrustedCallers attribute. For more information on programming for medium trust, check out the contents at the following URL: http://msdn2.microsoft.com/en-us/library/ms998341.aspx. In spite of the title, which refers to ASP.NET 2, the content is still up to date.
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ASP.NET Authentication Methods
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Depending on the type of the requested resource, IIS might or might not be able to handle the request itself. If the resource needs the involvement of ASP.NET (for example, it is an .aspx file), IIS hands the request over to ASP.NET along with the security token of the authenticated, or anonymous, user. What happens next depends on the ASP.NET configuration. Originally, ASP.NET supported three types of authentication methods: Windows, Passport, and Forms. A fourth possibility is None, meaning that ASP.NET does not even attempt to perform its own authentication and completely relies on the authentication already carried out by IIS. In this case, anonymous users can connect and resources are accessed using the
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Part IV
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default ASP.NET account. In ASP.NET 4, Passport authentication is marked as obsolete. It is largely replaced by oAuth. In particular, you can use your Windows Live ID with oAuth. You choose the ASP.NET authentication mechanism using the <authentication> section in the root web.config file. Child subdirectories inherit the authentication mode chosen for the application. By default, the authentication mode is set to Windows. Let s briefly examine Windows authentication and reserve wider coverage for the most commonly used authentication method Forms authentication.
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When using Windows authentication, ASP.NET works in conjunction with IIS. The real authentication is performed by IIS, which uses one of its authentication methods: Basic or Integrated Windows. When IIS has authenticated the user, it passes the security token on to ASP.NET. When in Windows authentication mode, ASP.NET does not perform any further authentication steps and limits its use of the IIS token to authorizing access to the resources. Typically, you use the Windows authentication method in intranet scenarios when the users of your application have Windows accounts that can be authenticated only by the Web server. Let s assume that you configured the Web server to work with the Integrated Windows authentication mode and that you disabled anonymous access. The ASP.NET application works in Windows authentication mode. What happens when a user connects to the application First, IIS authenticates the user (popping up a dialog box if the account of the local user doesn t match any accounts on the Web server or in the trusted domain) and then hands the security token over to ASP.NET.
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Using ACLs to Authorize Access
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In most cases, Windows authentication is used in conjunction with file authorization via the FileAuthorizationModule HTTP module. User-specific pages in the Web application can be protected from unauthorized access by using access control lists (ACLs) on the file. When ASP.NET is about to access a resource, the FileAuthorizationModule HTTP module is called into action. File authorization performs an ACL check on ASP.NET files using the caller s identity. For example, it will be sure that the user Joe will never be able to access an .aspx page whose ACL doesn t include an entry for him. Note, though, that file authorization does not require impersonation at the ASP.NET level and, more importantly, it works regardless of whether the impersonation flag is turned on. Once you ve set an appropriately configured ACL on an ASP.NET resource, you re pretty much done. Nobody will be able to access the resource without permission.
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