Cisco 7604 Configuration Guide - Page 476
HTTP Inspection, HTTP Inspection Overview
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HTTP Inspection Chapter 22 Applying Application Layer Protocol Inspection Total: 1 1 Concurrent Call(s) for Local: 10.100.100.1/12139 Foreign: 209.165.201.1/1720 0 CRV: 2 Local: 10.100.100.1/12139 TPKT: 211 Foreign: 209.165.201.1/1720 TPKT: 113 HTTP Inspection This section describes how the HTTP inspection engine works and how you can change its configuration. This section includes the following topics: • HTTP Inspection Overview, page 22-60 • Configuring an HTTP Inspection Policy Map for Additional Inspection Control, page 22-60 HTTP Inspection Overview Use the HTTP inspection engine to protect against specific attacks and other threats that may be associated with HTTP traffic. HTTP inspection performs several functions. • Enhanced HTTP inspection • Java and ActiveX filtering The second feature is configured in conjunction with the filter command. For more information about filtering, see Chapter 18, "Applying Filtering Services." Note The no inspect http command also disables the filter url command. The enhanced HTTP inspection feature, which is also known as an application firewall and is available when you configure an HTTP map (see "Configuring an HTTP Inspection Policy Map for Additional Inspection Control"), can help prevent attackers from using HTTP messages for circumventing network security policy. It verifies the following for all HTTP messages. • Conformance to RFC 2616 • Use of RFC-defined methods only. • Compliance with the additional criteria. Configuring an HTTP Inspection Policy Map for Additional Inspection Control To specify actions when a message violates a parameter, create an HTTP inspection policy map. You can then apply the inspection policy map when you enable HTTP inspection according to the "Configuring Application Inspection" section on page 22-6. Note When you enable HTTP inspection with an inspection policy map, strict HTTP inspection with the action reset and log is enabled by default. You can change the actions performed in response to inspection failure, but you cannot disable strict inspection as long as the inspection policy map remains enabled. 22-60 Catalyst 6500 Series Switch and Cisco 7600 Series Router Firewall Services Module Configuration Guide using ASDM OL-20748-01
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