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Using the "client_skip_content" and "server_skip_content" parameters in the intscan.ini file

    • Updated:
    • 21 Oct 2015
    • Product/Version:
    • InterScan Web Security Suite 3.1 Linux
    • InterScan Web Security Suite 3.1 Windows
    • Platform:
    • Linux - Red Hat RHEL 4 32-bit
    • Linux - Red Hat RHEL 5 32-bit
    • Linux - Red Hat RHEL 6 32-bit
    • Linux - SuSE version 10
    • Unix - Solaris (Sun) version 10 (SunOS 5.10)
    • Windows 2003 Enterprise Server
    • Windows 2003 Standard Server Edition
    • Windows 2008 Enterprise
    • Windows 2008 Standard
Summary

Skip various content scanning features in the HTTP service using the two parameters: "client_skip_content" and "server_skip_content". These can be used when there are unnecessary content scanning such as access of intranet resources.

Details
Public

You can configure the following parameters in the intscan.ini file:

  • client_skip_content=
  • client_skip_content_sp=
  • server_skip_content=
  • server_skip_content_sp=

The parameters ending in "_sp" are used to separate multiple entries. Their default value is a comma (,). Below is an example:

client_skip_content=User-Agent: NSPlayer, User-Agent: Windows-Media-Player, User-Agent: RMA, User-Agent: QuickTime

To use a different separator, change the value of the parameter similar to the example below for "client_skip_content_sp=;":

client_skip_content=User-Agent: NSPlayer; User-Agent: Windows-Media-Player; User-Agent: RMA; User-Agent: QuickTime

"Client_skip_content" is used to skip scanning a reply originating from a specific request. It only checks for a matched string in the client request. On the other hand, the "Server_skip_content" only matches the strings in the server response.

An example of this scenario is allowing content with streaming media. You go to http://radio1.be/ to listen to the web radio. When you click a button to start listening, the system will realize that the browser cannot display the content. It needs a Windows Media Player as browser plug-in and then the Media Player will try to access the browser and request the following:

GET /radio1-low.mp3?wmcache=0 HTTP/1.1
Accept: */*
User-Agent: NSPlayer/9.0.0.3250 WMFSDK/9.0
Accept-Encoding: gzip, deflate
Host: mp3.streampower.be
Connection: Keep-Alive
HTTP/1.0 200 OK
Content-Type: audio/mpeg
icy-br:16
icy-description:Radio 1 - low
icy-genre:Various
icy-name:Radio 1 - low
icy-pub:0
icy-url:http://www.radio1.be
Server: Icecast 2.3.1

Therefore, to skip scanning the requested data, you can set the parameter to "client_skip_content= User-Agent: NSPlayer".

Premium
Internal
Rating:
Category:
Configure
Solution Id:
1033427
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