8.1 CONTROLLING ACCESS TO WEB SERVER RESOURCES generate, create code 128 none with .net projects iOS Note: The entry on code-128c for .NET line 5 must appear rst in the list. This entry denies all rights to any users (authenticated and unauthenticated users).

This entry evaluates to TRUE, so the next entry in the list (line 6) is evaluated next. Subsequent ACEs are then de ned to grant speci c rights to certain users..

In addition to the se rights, the Web Server allows you to con gure access control based strictly on the HTTP method by using the http_<method> right. Suppose, for instance, that you want to block a particular host (or subnet) from issuing the GET method. In Web Server 7.

0, you could create a deny rule similar to the following to achieve these results:. deny (http_GET) ip Code 128 Code Set A for .NET = 123.45.

67.* ;. Finally, you can c ontrol privileges associated with the distributed authoring and versioning (DAV) capabilities of the HTTP protocol in Web Server 7.0. For instance, you could create entries that either allow or deny DAV capabilities by specifying the appropriate privilege (such as dav:read-acl, or dav:read-currentuser-privilege-set) within the ACE .

. Note: For more inf .net framework Code 128 Code Set B ormation on the types of DAV privileges that can be controlled in Web Server 7.0, see RFC-3744 (Web Distributed Authoring and Versioning (WebDAV) Access Control Protocol).

. Access Control Processing When the Web Serve .NET code-128b r receives an incoming request, it selects the appropriate virtual server and determines whether the client is allowed or denied access, based on a hierarchy of rules called access control entries (or ACEs). The Web Server takes into account any general server ACEs and then determines whether any ACEs have been con gured for the virtual server based on the client request.

If so, the server evaluates each ACE to determine whether access should be granted or denied. The collection of ACEs for a particular resource is called an access control list (or ACL). Access control lists are generated by scanning instance or virtual server speci c access control les for any ACEs that apply to the current request.

Access control entries found in the default.acl are processed before those found in any virtual server speci c access control les. The order in which ACEs appear within those les is also important because previously de ned ACEs appear before those de ned later in the le.

. SECURING WEB SERVER 7.0 After the ACL is g code 128c for .NET enerated, the Web Server processes it from top to bottom to determine whether the client is allowed or denied access. If at any time an ACE evaluates to FALSE, then processing of the ACL stops and the client is denied access to the resource.

The server processes the list until it reaches the end or it reaches an absolute ACE. If processing reaches the end of the ACL without seeing a FALSE condition, then the user is granted access to the resource..

Note: If an ACE re solves to TRUE, then the next ACE in the list is evaluated if and only if the ACE is not an absolute ACE. If an absolute ACE evaluates to TRUE, then the user is allowed or denied access based on the de nition speci ed by the ACE, and no further processing of the list is performed. ACEs are made absolute when the keyword absolute is speci ed in the ACE de nition as follows.

. allow absolute (re Visual Studio .NET Code128 ad, execute, info) user = anyone ;..

You can also speci fy this in the Administration Console (GUI) by deselecting the Continue check box when de ning the ACE.. There are two ACLs Visual Studio .NET USS Code 128 de ned (by default) in Web Server 7.0: default and esinternal.

Figure 8.3 demonstrates how the default access control list appears in the Administration Console. Example 8.

7 then provides the corresponding entries in the default.acl le (line numbers have been added for demonstration purposes)..

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