Web Gateway 7.1.5 Product Guide - McAfee

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6 Web filtering URL filtering Rules for URL filtering Rules that filter URLs are contained in a URL filtering rule set. This section explains an individual filtering rule and describes the rules in a URL filtering rule set. A rule set for URL filtering usually includes a blocking rule that blocks access to URLs per category and one that blocks access according to reputation. A whitelisting rule exempts URLs that should not get blocked from filtering. The whitelisting rule is placed before the blocking rules, so it is processed before them. If a requested URL matches an entry on the whitelist, the rule applies. It stops the processing of the rule set, so the blocking rules are not processed and cannot apply. A rule set like this is usually included when the wizard creates a system of rule sets. It is also included in the default system. There can be several URL filtering rule sets in a rule set system, containing rules that apply to different user groups. URL filtering rule sets can differ from each other in that they use different blocking lists and whitelists. They do not differ, however, in their basic structure, which combines a whitelisting rule with blocking rules that block URLs individually or according to their categories and reputation scores. View the implemented URL filtering rules The URL filtering rules that are implemented on the appliance can be viewed on the user interface. 1 Go to Policy | Rule Sets. 2 On the rule sets tree, go to the rule set that contains the URL filtering rules, which is by default named URL Filtering. The individual rules appear on the settings pane. 3 On the settings pane, click Show Details. Rule conditions and events are displayed for each rule. You can modify these rules, delete them, and also create your own rules. URL filtering rule This section explains a category blocking rule, which is a key rule type in URL filtering. Note: The rule is shown here in a notation that comes close to how it appears on the user interface. Name Block URLs whose category is in URL Category BlockList Criteria Action URL.Categories at least one in list Category BlockList –> Block In plain text, this rule can be rephrased as follows: If a URL belongs to a category that is on a blocking list, block access to it. The property of the rule criteria is URL.Categories. This property is checked for a given URL and the URL Filter module is called to find the categories the URL belongs to. If these are on the specified blocking list, the criteria is matched and the rule applies. The rule then executes its action, which is the Block action. It blocks access to the URL. If a URL belongs to more than one category, it is blocked if any of these categories is on the list. The URL.Categories property has the Default settings specified for it. This means the module that retrieves the category information runs with these settings. The settings determine, for example, whether a DNS lookup is performed for a URL and category information also searched for based on the corresponding IP address. 188 McAfee Web Gateway 7.1.5 Product Guide
Web filtering URL filtering 6 The Block action also has settings. These specify a message that is sent to a user who is affected by the action. For this URL blocking rule, the URL Blocked settings are specified, which means that the message mentions the category that a requested URL belongs to as the reason for the blocking. URL Filtering (rule set) This section describes the URL Filtering library rule set. For general information on understanding and handling rules, see Rules and rule sets. Library rule set — URL Filtering Criteria — Always Cycles — Requests (and IM) The rule set contains the following rules: Allow URLs that match in URL WhiteList URL matches in list URLWhiteList –> Stop Rule Set The rule uses the URL property to check whether a given URL is on the specified whitelist. If it is, processing of the rule set stops and the blocking rules that follow the whitelisting rule are not processed. You can use this rule to exempt URLs from filtering to make sure they are available to the users of your network and do not get blocked by any of the following blocking rules. Whitelisting also increases performance because it avoids the effort of retrieving information about the respective URLs. Block URLs that match in URL BlockList URL matches in list URL BlockList –> Block — Statistics.Counter.Increment (“BlockedByURLFilter”,1) The rules uses the URL property to check whether a given URL is on the specified blocking list. If it is, processing of all rules stops and the request for access to the URL is not passed on to the appropriate web server. Access to it is blocked this way. The action settings specify a message to the requesting user. The rule also uses an event to count blocking due to virus and malware infections. The event parameters specify the counter that is incremented and the size of the increment. The event settings specify the settings of the Statistics module, which executes the counting. Enable SafeSearchEnforcer Always –> Continue — Enable SafeSearchEnforcer The rule enables the SafeSearchEnforcer, which is an additional module for filtering access to web sites with adult content. The enabling is done by executing an event. The settings of the module are specified with the event. Processing continues with the next rule. McAfee Web Gateway 7.1.5 Product Guide 189
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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 Common proxy se
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8 Make sure the following is config
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Proxies and caching Reverse HTTPS p
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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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5 Filtering users Authentication an
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Authentication and access managemen
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Module for authenticating users Aut
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LDAP Settings specifying the LDAP m
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Novell eDirectory Settings specifyi
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Kerberos Settings specifying the Ke
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Page 201 and 202: Web filtering Media type filtering
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Page 213 and 214: Media Type String Blocklist List of
Page 215 and 216: Global whitelists Web filtering Glo
Page 217 and 218: Web filtering SSL scanning 6 Handle
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Page 221 and 222: Web filtering SSL scanning 6 Verify
Page 223 and 224: Modules for SSL scanning Web filter
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Page 235 and 236: Web filtering Supporting functions
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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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