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Configuring the HTTP extensions
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Configuring ISA Server as a Firewall
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3. In Specify The Action Taken For File Extensions, select one of the following options:
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Allow All Extensions No blocking according to requested file extensions will be applied. Allow Selected Extensions All requests will be blocked except those with specified requested file extensions. Block Specified Extensions (Allow All Others) All requests will be allowed except those with requested file extensions specified in the list.
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4. Click Add to add an extension to the list. 5. When you click Add, the Extension dialog box opens, as shown in Figure 7-19. Provide the extension (which is case-sensitive) and a description, and then click OK.
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Figure 7-19 Configuring a specific HTTP extension
6. Select Block Requests Containing Ambiguous Extensions if you want to block content when ISA Server cannot determine the extension. A typical use of extension blocking is to block executable files such as .exe, .bat, or .cmd files. Another example is to use extension blocking to prevent worm attacks. For example, the Code Red Worm uses a header that included GET http://<ipaddress>/ default.ida so you could stop the worm from entering the network by blocking .ida extensions. You can also use file extensions to enforce organizational policies that restrict the types of data that can be downloaded.
How to Configure HTTP Web Filter Headers
When a client sends a request to a Web server, or when the server responds, the first part of that response is always the HTTP request or response.
The HTTP request from the client includes the client s HTTP method (such as GET) as well as the URI that the client is requesting and the protocol version. The server HTTP response contains the protocol version followed by a numeric status code and its associated textual phrase. For example, if the server responds with a 2xx code, the server is indicating that the request was successfully received,
Lesson 5
Implementing Application and Web Filtering
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understood, and accepted. A 4xx code is a client error that indicates that the request contains bad syntax or cannot be fulfilled. After the HTTP request or response, the client and server send an HTTP header. The request-header fields allow the client to pass additional information about the request, and about the client itself, to the server. Headers contain information about the client, including browser and operating system data, authorization information, and the format types that client supports for the server response. The client header can also use the User-Agent to indicate the specific application that is making the request. You can use this header information to block HTTP packets. To configure how the HTTP filter will manage headers, follow this procedure: 1. To access the HTTP policy associated with a specific rule, right-click the rule in ISA Server Management Console and select Configure HTTP. 2. To modify the HTTP headers settings on the HTTP policy, click the Headers tab, as shown in Figure 7-20.
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Figure 7-20
Configuring the HTTP headers
3. In Headers, list the headers that will be blocked. Click Add to add a header to the list. When you click Add, the Header dialog box opens. Specify whether the response or request header will be checked, provide the header, and then click OK. 4. In Server Header, specify how the server header will be returned in the response. The server header is a response header that contains information such as the name
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Configuring ISA Server as a Firewall
of the server application and software version information, for example, HTTP: Server = Microsoft-IIS/6.0. The possible settings are the following:
Send Original Header The original header will be returned in the response. Strip Header From Response No header will be returned in the response. Modify A modified header will be returned in the response. If you select this option, in Change To, type the value that will appear in the response.
5. In Via Header, specify how the Via header will be forwarded in the request or returned in the response. Via headers provide a way for proxy servers in the path of a request to ensure that they are also included in the path of the response. Each server along the request s path can add its own Via header. Each sender along the response path removes its own Via header and forwards the response to the server specified in the next Via header on the stack. For example, you can use this feature to avoid disclosing the name of your computer running ISA Server in a response. The possible settings are:
Send Default The default header will be used. Modify Header In Request And Response The Via header will be replaced with a modified header. If you select this option, in the Change too box, type the header that will appear instead of the Via header.
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