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What Are Web Filters
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Web filters also extend the functionality of the firewall service in ISA Server by providing advanced filtering capability for HTTP packets as they pass through ISA Server. Web filters are DLLs that are based on the Microsoft Internet Information Services (IIS) Internet Server Application Programming Interface (ISAPI) model. The Web filters are loaded by the Web proxy filter, which is an application filter. When a Web filter is loaded, it passes information to the Web proxy filter that specifies the types of events that the filter is configured to monitor. Each time one of those events occurs, the Web filter is notified. Web filters can be used to perform a number of different tasks, including the following:
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Request scanning and modification A Web filter can scan HTTP client requests and modify or add a header to a request. For example, you could use a Web filter to add a cookie header to the request, or remove a header sent by the client. Response scanning and modification Web filters can scan and modify the server responses. For example, during link translation, ISA Server substitutes the externally accessible server names for the internal names. The link translation filter included with ISA Server is a Web filter. Block specific responses Web filters can be used to block access to particular sites based on the content of the server response. These features can also be used to scan HTTP packets for viruses. Traffic logging and analysis Web filters can be used to log specific information about HTTP traffic and to create reports based on the logged information. Data encryption or compression Web filters can be used to apply custom data encryption or compression schemes to HTTP packets. Custom authentication schemes Outlook Web Access (OWA) forms-based authentication, RSA SecurID authentication, and Remote Authentication Dial-In User Service (RADIUS) authentication are all implemented as Web filters in ISA Server. Third-party vendors can use Web filters to implement additional authentication schemes.
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Implementing Application and Web Filtering
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See Also To view all the Web filters included with ISA Server 2004, open the ISA Server Management Console, expand Configuration, and then click Add-ins. The Web filters are listed on the Web Filters tab. You can enable or disable the Web filters from this interface but most Web filters cannot be modified.
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How the HTTP Web Filter Works
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One of the more important Web filters included with ISA Server 2004 is the HTTP filter. Many Internet applications now use HTTP to tunnel the application traffic. For example, Microsoft MSN Messenger uses HTTP as the application-layer protocol. The only way to block these types of applications without blocking all HTTP traffic is to use HTTP filtering. HTTP filtering can be applied in two general scenarios:
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Clients on an internal network accessing HTTP objects on another network through ISA Server. This access is controlled by ISA Server access rules, to which an HTTP policy can be applied using the HTTP filter. Clients on the Internet accessing HTTP objects on a Web server that is published through ISA Server. This access is controlled by ISA Server Web publishing rules, to which an HTTP policy can be applied using the HTTP filter.
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HTTP filtering is rule-specific, so that you can apply different levels and types of filtering depending on the specific requirements of your firewall policy. For example, you can use HTTP filtering to block the use of a particular peer-to-peer file-sharing service for one set of users, but allow it for another set, or you can allow Internet users to use specific HTTP methods such as POST for one Web publishing rule, but deny the method on another Web publishing rule. (Table 7-6, later in this chapter, lists HTTP 1.1 methods.)
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