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ciscoasa(config)# filter java 80 0000 0000 0000 0000 -orciscoasa(config)# filter java http 0 0 0 0
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NOTE Remember that you can abbreviate 0000 as a single 0
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If you wanted to filter Java applets for the 192110/24 external network for all your internal users, the configuration would look like this:
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ciscoasa(config)# filter java 80 0 0 192110 2552552550
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Configuring ActiveX Filters
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In addition to being able to filter Java applets, you can also filter ActiveX scripts using the filter activex command Here is the syntax of this command:
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ciscoasa(config)# filter activex port_name_or_#[-port_name_or_#] internal_IP_address subnet_mask external_IP_address subnet_mask
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The syntax of the filter activex command is basically the same as the filter java command and behaves in the same manner If you want to filter all ActiveX scripts, use this example:
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ciscoasa(config)# filter activex 80 0 0 0 0 -orciscoasa(config)# filter activex http 0 0 0 0
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As you can see, filtering ActiveX scripts is no different from filtering Java applets both are easy to set up
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WEB CONTENT FILTERING
One major concern of many companies connected to the Internet is the type of information that their employees are downloading to their desktops Quite a few studies have been done, and, on average, 30 40 percent of a company s Internet traffic is nonbusiness
7:
Web Content
in nature (I m actually surprised that the statistic isn t higher) In some instances, the information that employees download can be offensive to other employees This information can range from pornography to political and religious content A lot of the downloaded content like stock quotes and audio and video streaming is inoffensive, but can use up expensive bandwidth The appliances have limited and nonscalable abilities when filtering web content (I discuss this in 12) A much more scalable solution is to have the appliances work with third-party products to provide comprehensive web filtering features The following sections cover how the appliances and web filtering products interact, the third-party web filtering products that the appliances support, and web filtering configuration on the appliances
Web Filtering Process
To implement web content filtering, sometimes referred to as web filtering, two components are involved: Policies must be defined that specify what is or isn t allowed by users The policies must be enforced
Two methods that perform these processes are commonly deployed in networks: Application proxy Modified proxy
The following two sections will discuss these approaches
Application Proxy
With an application proxy, both components definition and enforcement of policies are performed on one server Either users web browsers are configured to point to the proxy, or their traffic is redirected to the proxy With an application proxy, the following steps occur when a user wants to download web content: 1 The user opens a web page 2 All connections are redirected to the application proxy server, which might require the user to authenticate before external access is allowed 3 The application proxy examines the connection(s) attempt and compares it with the list of configured policies 4 If the connection is not allowed, the user is typically shown a web page about the policy violation 5 If the connection is allowed, the proxy opens the necessary connections to download the content The content is then passed back across the user s original connections and is displayed in the user s web browser
Cisco ASA Configuration
Application proxies work quite well in small environments that have a small number of simultaneous web requests Remember that downloading each element on a web page, like graphics, applets, and so on, requires a separate connection for each element Therefore, the more pages that multiple users request, the less throughput occurs through the proxy it must handle twice the number of connections: from the user to the proxy, and from the proxy to the external web servers This process can quickly become a bottleneck on the proxy, being CPU- and memory-intensive And if the proxy is caching information, the process can become disk-intensive
Modified Proxy
A modified proxy splits out the two policy components: an external server has the list of policies, and a network device implements the policies as web traffic flows through it The appliances support the modified proxy approach: to filter web content, the appliances must interoperate with an external web content server Figure 7-1 shows the actual interaction between the users, the appliance, the policy server, and the external web server In this example, a user sends an HTML request to an external web server (step 1) The appliance then does two things in step 2: Forwards the HTML request (the URL information only) to the web content policy server Forwards the HTML request to the actual web server
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