Web Gateway 7.1.5 Product Guide - McAfee

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6 Web filtering Filtering web objects The sections of this chapter explain these activities in detail for individual filtering functions. They assume that you have read the Rule and Rule Sets chapter, which provides general information on handling rules and how they use filter lists and modules. For more information, see Rules and rule sets and the sections on individual filtering functions, such as Virus and malware filtering, URL filtering, and others. For adapting user messages, see User messages. Functions for filtering web objects You can use the following functions to filter web objects on the appliance: • Virus and malware filtering — You can filter web objects and block them if they are infected by viruses and other malware, using the Antimalware module, which can apply different methods when scanning objects. • URL filtering — You can filter URLs individually and per category and block inappropriate or malicious content, using filter lists and information that the URL Filter module retrieves from the global Global Threat Intelligence system. • Media type filtering — You can filter media types and block text, audio, image, streaming, or other media, using appropriate filter lists for upload and download. • HTML filtering — You can filter HTML pages and have embedded objects, including Java and Visual Basic scripts, ActiveX controls, and others, removed from them. • Global whitelisting — You can enter URLs onto a global whitelist to ensure the users of your network can access them. • SSL scanning — You can have SSL-secured requests inspected to make them available for further filtering and block objects if they are not sufficiently secured by a valid certificate. You can also use functions that do not themselves filter web objects, but support the filtering process: • Progress indication — You can show users the progress made in downloading objects. • Next-hop proxies — You can use next-hop proxies for routing requests to their destinations. For more information, see the sections on individual filtering and supporting functions, for example, URL filtering or Progress Indication. 170 McAfee Web Gateway 7.1.5 Product Guide
Virus and malware filtering Web filtering Virus and malware filtering 6 The appliance filters web objects to block viruses and other malware. This section gives an overview of the virus and malware filtering process and describes in detail how you can modify it. Virus and malware filtering process Several elements work together in the virus and malware filtering process on the appliance. These include: • Filtering rules that control the process • Whitelists that are used by rules to exempt particular web objects from filtering • The Anti-Malware module, which is called by a suitable rule to scan web objects for infections by viruses and other malware Filtering rules The rules that control the virus and malware filtering process are usually contained in one rule set. There is a rule that blocks web objects if infected by viruses and other malware. To find out about infections, the rule calls the Anti-Malware module, which scans objects and lets the rule know about its findings. Whitelisting rules can be placed and processed in this rule set before the blocking rule. If any of them applies, the blocking rule is skipped and no virus and malware filtering is done for the whitelisted objects. You can review these rules, modify or delete them, and also create your own rules. For more information, see Rules for virus and malware filtering. Whitelists Whitelists are used by whitelisting rules to let particular web objects skip the blocking rule, which means there is no virus and malware filtering for these objects. There can be different whitelists for URLs, media types, and other types of objects. Note: Blocking lists are typically not used in virus and malware filtering because here the blocking depends not on lists, but on the findings of the Anti-Malware module. You can add entries to these lists or remove entries. You can also create your own lists and let them be used by the whitelisting rules. For more information, see Whitelists for virus and malware filtering. Anti-Malware module The Anti-Malware module scans objects to detect infections by viruses and other malware. Based on the findings of this module, the blocking rule blocks access to web objects or lets them pass through. You can configure settings for this module, for example, to let it scan objects using only virus signatures to detect infections or also proactive methods. For more information, see Module for virus and malware filtering. McAfee Web Gateway 7.1.5 Product Guide 171
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Product Guide McAfee ® version 7.1
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Contents Preface 9 About this guide
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Contents Standard authentication .
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Contents Create an error handler .
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Preface About this guide This Produ
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Table i-2 Acronyms (continued) Acro
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1 Introduction Contents Comprehensi
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Deployment of the McAfee Web Gatewa
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Operating system Introduction Filte
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Introduction Chapters of this guide
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2 Setup and logon Contents Setting
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Setup and logon Setting up the McAf
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Installing the appliance software S
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2 Review the summary that is displa
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Import a license Setup and logon Lo
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Main elements of the user interface
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Setting up system management tools
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Setup and logon Setting up system m
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3 Proxies and caching Contents Inte
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Explicit proxy mode Proxies and cac
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Table 3-1 WCCP Services list (conti
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Proxies and caching Network modes 3
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Transparent bridge mode Proxies and
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Transparent router mode Proxies and
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Common proxy settings Proxies and c
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Proxies and caching Providing proxy
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Preventing data leaks Proxies and c
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Web caching Proxies and caching Web
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Bypass lists for web caching Proxie
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Verify the enabling of the web cach
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4 Rules and rule sets Contents Filt
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Rules and rule sets Filtering contr
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Modules for delivering filtering in
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Rules on the user interface On the
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Property of a URL Property — URL.
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About rule sets Rules and rule sets
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Rules and rule sets About rule sets
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Table 4-4 Rule set library Rule set
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The Rule Sets toolbar provides the
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Add name, comment, and enabling Com
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Add as many parameters as needed. A
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3 Select Event. The Add Event windo
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Adding the action 9 Select Action.
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Rules and rule sets Rule configurat
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Add a new rule set You can also cre
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List maintenance Rules and rule set
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Add a list Complete the following p
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Action and engine settings Rules an
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Access restrictions Rules and rule
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Web filtering SSL scanning 6 Verify
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Modules for SSL scanning Web filter
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Web filtering SSL scanning 6 SSL Cl
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8 Click OK. The window closes and t
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The rule set contains the following
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Bandwidth throttling Web filtering
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Next-hop proxies Web filtering Supp
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Web filtering Supporting functions
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User messages Web filtering User me
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The following table describes the o
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Table 6-25 Template Editor (continu
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Web filtering User messages 6 Redir
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7 System configuration Contents Con
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System settings System configuratio
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Table 7-4 List of sections on syste
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License system settings System conf
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Network Protection system settings
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System configuration System setting
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Database updates Table 7-13 File Ed
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System configuration Database updat
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Configure central management settin
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System configuration Central manage
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Scheduled job settings This section
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System configuration Central manage
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8 Monitoring Contents Monitoring th
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Monitoring Dashboard 8 Overview of
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Charts and Tables tab Monitoring Da
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Table 8-4 Overview of charts and ta
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Logging Monitoring Logging 8 Applia
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Sample logging rule Monitoring Logg
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13 Configure the following for the
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Monitoring Logging 8 4 Go to Policy
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+ Number.ToString (Block.ID) + “
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Create a rule for setting text as t
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Monitoring Logging 8 • In the Con
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Configuring log file settings Monit
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Monitoring Logging 8 Auto Pushing S
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Log handler rule sets Monitoring Lo
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Performance measurement Monitoring
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Monitoring Performance measurement
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Transferring data to an ePO server
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Event monitoring with SNMP Monitori
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Error handling Table 8-7 Trap Sinks
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Rule sets for error handling Monito
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The rule set contains the following
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Monitoring Error handling 8 Handle
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Monitoring Error handling 8 Block o
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9 Troubleshooting Contents Troubles
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Enable the creation of connection t
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List of actions Appendix: Configura
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Table A-2 List of error IDs (contin
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Table A-3 List of events (continued
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Table A-3 List of events (continued
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List of incident IDs Appendix: Conf
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Table A-4 List of incident IDs (con
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Table A-5 List of properties (conti
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Wildcard expressions Appendix: Conf
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Table A-6 List of important special
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Table A-7 List of important special
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Index A access restrictions 117 act
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I ICAP server, see proxies ICQ, see
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SNMP monitoring 303 SSL scanning Ce
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700-3299A00
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