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HTTP filters can also filter HTTPS traffic in a Web publishing Secure Sockets Layer (SSL) bridging scenario. In this case, ISA Server decrypts the packet and inspects it before reencrypting the packet. HTTP filters cannot filter HTTPS traffic in an SSL tunneling scenario. For more details about configuring SSL bridging and tunneling, see 8, Implementing ISA Server Publishing.
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Configuring ISA Server as a Firewall
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HTTP Filter Options
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The HTTP filter can block HTTP requests based on the following options:
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Length of request headers and payload Limits the maximum HTTP header size and request body size for a client request. Length of Uniform Resource Locator (URL) client requests. Limits the maximum URL size for
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HTTP request method Specifies the HTTP method, such as POST, GET, or HEAD, that will be blocked. HTTP request file-name extension Prevents the downloading of any content using HTTP based on file extensions such as .exe, .asp, or .dll. HTTP request or response header Specifies how server headers will be returned or forwarded when the server responds to the client. For example, the request or response header may be Location, Server, or Via. Signature or pattern in the requester response headers or body Specifies HTTP access based on specific strings in the response header or body.
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The HTTP filter is initially configured with defaults that help ensure secure HTTP access. However, depending on the specific deployment scenario, these options should be customized.
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To fully understand how the HTTP filter works, you must understand how HTTP works. For more information about HTTP see Request for Comments (RFC) 2616: Hypertext , Transfer Protocol HTTP/1.1, located at http://www.ietf.org/rfc/rfc2616.txt.
See Also
How to Configure a HTTP Web Filter
HTTP filters are applied on a per-rule basis. To configure the HTTP filters on a particular access rule or Web publishing rule, modify the HTTP policy for that rule.
Important The one exception to the per-rule application of the HTTP filter is the Maximum headers length setting on the General tab of the Configure HTTP Policy For Rule dialog box. This setting is applied to all rules globally, which means that if you change it in one rule, it is changed in all rules.
Lesson 5
Implementing Application and Web Filtering
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Configuring HTTP Policy General Properties
To access the HTTP policy associated with a specific rule, right-click the rule in ISA Server Management Console and select Configure HTTP, as shown in Figure 7-15.
F07im15
Figure 7-15
Configuring the HTTP policy general properties
Table 7-5 describes the configuration options available on the General tab of an HTTP policy.
Table 7-5
Configuring HTTP Policy General Properties
Configuration Options Explanation Reducing the allowed header size mitigates the risk of attacks that require complex and long headers, such as buffer overflow attacks and some denial-of-service attacks. If you set the maximum header length too low, it could break some legitimate applications that use long headers. By limiting the request payload you can restrict the amount of data a user can POST to your Web site in a Web publishing scenario. To determine what limit to set, estimate the maximum size of a file that would constitute a legitimate POST based on your site usage and use that as the allowed payload length.
Setting
Request Headers, Specify the maximum Maximum headers number of bytes that a length (bytes) request can have in its headers (URL and headers) before it is blocked. Request Payload, To block requests Allow any payload exceeding a specified length maximum payload length, clear the Allow Any Payload Length (Bytes) check box. Then, in Maximum Payload Length (Bytes), specify the maximum number of bytes.
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Configuring ISA Server as a Firewall
Table 7-5 Configuring HTTP Policy General Properties
Setting URL Protection, Maximum URL length (bytes)
Configuration Options Explanation Specify the maximum URL length allowed. Use this option to limit the length of URLs used in a request. You may want to limit the URL length if you learn of an attack based on a long URL string. By default the maximum query length is set to 10240.
URL Protection, Maximum query length (bytes)
Specify the maximum The query is the part of a URL that follows . query length allowed in a You may want to limit the query length if you request. learn of an attack based on a long query string. By default the maximum query length is set to 10240. Use this to block requests with URLs containing escaped characters after normalization. Web servers receive requests that are URL encoded. This means that certain characters may be replaced with a percent symbol (%) followed by a particular number. For example, %20 corresponds to a space. Normalization is the process of decoding URL-encoded requests. Because the percent symbol (%) itself can be URL-encoded, an attacker can submit a URL request to a server that is double-encoded. When you select Verify Normalization, the HTTP filter normalizes the URL twice. If the URL after the first normalization is different from the URL after the second normalization, the filter rejects the request.
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