Web Gateway 7.1.5 Product Guide - McAfee

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6 Web filtering HTML filtering Enable HTML Filtering This nested rule set prepares HTML filtering by enabling the HTML opener and removing a header element. Nested library rule set — Enable HTML Filtering Criteria — Always Cycles — Requests (and IM) and responses The rule set contains the following rule: Enable HTML opener Always –> Continue — Enable HTML Opener The rule uses an event to enables the HTML opener. The settings of this module are specified with the event. Processing continues with the next rule. Remove header for “Content-Length” Always –> Continue — Header.RemoveAll (“Content-Length”) The rule uses an event to remove the header providing the content length from a request. Processing continues with the next rule set. HTML Filtering (nested rule set) This nested rule set removes different types of objects embedded in HTML pages, using a nested rule set for each type. Nested library rule set — Enable HTML Filtering Criteria — MediaType.EnsuredTypes contains text/html Cycles — Embedded objects The following rule sets are nested in this rule sets: • Embedded Objects • Embedded Scripts • ActiveX Controls Note: This rule set is not enabled by default. • Advertising Filter Note: This rule set is not enabled by default. 208 McAfee Web Gateway 7.1.5 Product Guide
Web filtering HTML filtering 6 Embedded Objects This nested rule set removes Java applets embedded in HTML pages, as well as other embedded media types if they are on a blocking list. It is processed in the embedded object cycle when these objects are sent with requests or responses. Nested library rule set — Embedded Objects Criteria — Always Cycle — Embedded objects The rule set contains the following rules: Java applets HTMLElement.Name equals “APPLET” OR ( HTMLElement.Name equals “OBJECT” AND HTMLElement..HasAttribute (“codetype”) equals true AND HTMLElement.Attribute (“codetype”) equals “application/java”) –> Remove The rule uses several HTMLElement ... properties to remove an element from an HTML page if it is found that particular values are true for these properties. An element is removed if its name is APPLET or if its name is OBJECT and has a code type attribute with application/java as its value. Processing of the embedded object cycle stops then and the HTML page is forwarded without the removed element to the user who requested it or to the web if a user attempted to upload it. Stop if element is not interesting (HTMLElement.Name does not equal “OBJECT” AND HTMLElement.Name does not equal “embed”) OR HTMLElement.HasAttribute (“type”) equals false –> Stop Rule Set The rule uses several HTMLElement ... properties to check whether an element needs not be removed. An element needs not be removed if its name is neither OBJECT nor embed or has no type attribute at all. Processing of the rule set stops then, so the rule that removes elements from HTML pages (and follows this rule in the rule set) is not processed. Processing continues with the next rule set. Default action for unlisted media types HTMLElement.Attribute (“type”) is not in list Media Type Whitelist HTMLElement.Attribute (“type”) is not in list Media Type Blocklist –> Stop Rule Set The rule uses the HTMLElement.Attribute property to check whether an element is of a type that is neither on the relevant whitelist nor the blocking list. In this case, a default action is executed, which for this rule is Stop Rule Set. Processing of the rule set stops then, so the whilelisting and blocking rules for media types that follow in the rule set are not processed. Processing continues with the next rule set. Handle whitelisted media types HTMLElement.Attribute (“type”) is in list Mediatype whitelist The rule uses the HTMLElement.Attribute property to check whether the type of an element is on a media type whitelist. If it is, the rule applies. Processing of the rule set stops then, so the removing rule that follows this rule in the rule set is not processed. Processing continues with the next rule set. Note: This rule is not enabled by default. McAfee Web Gateway 7.1.5 Product Guide 209
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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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Table 5-8 Certificate Authorities l
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Page 157 and 158: Authentication and access managemen
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Page 169 and 170: 6 Web filtering Contents Filtering
Page 171 and 172: Virus and malware filtering Web fil
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Page 177 and 178: Whitelists for virus and malware fi
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Page 187 and 188: URL filtering Web filtering URL fil
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Page 191 and 192: Modify a filtering rule to block un
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Page 195 and 196: Module for URL filtering Web filter
Page 197 and 198: Web filtering URL filtering 6 Advan
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Page 205 and 206: Lists for media type filtering Web
Page 207: HTML filtering Web filtering HTML f
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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
Page 219 and 220: Block untrusted certificate authori
Page 221 and 222: Web filtering SSL scanning 6 Verify
Page 223 and 224: Modules for SSL scanning Web filter
Page 225 and 226: Web filtering SSL scanning 6 SSL Cl
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Page 235 and 236: Web filtering Supporting functions
Page 237 and 238: User messages Web filtering User me
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Page 245 and 246: 7 System configuration Contents Con
Page 247 and 248: System settings System configuratio
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Page 257 and 258: 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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Web Gateway 7.1.5 Product Guide - McAfee

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