Web Gateway 7.1.5 Product Guide - McAfee

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6 Web filtering HTML filtering Handle blocklisted media types HTMLElement.Attribute (“type”) is in list Mediatype blocklist –> Remove The rule uses the HTMLElement.Attribute property to check whether the type of an element is on a media type blocklist. If it is, the rule applies and the media type in question is removed from the HTML page. 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. Embedded Scripts This nested rule set removes script code embedded in HTML pages, providing options for keeping some code types. It is processed in the embedded object cycle when this code is sent with requests or responses. Nested library rule set — Embedded Scripts Criteria — HTMLElement.Name equals “SCRIPT” Cycle — Embedded objects The rule criteria specifies that the rule set applies when an element of the script type is embedded in an HTML page. The rule set contains the following rules: Variable resetter Always –> Continue – Set User-Defined.removeOneScript = false The rule sets the User-Defined.removeOneScript property to false, so the break rules that follow this rule later in the rule set do not apply. Processing continues with the next rule. Note: This rule is not enabled by default. JavaScript HTMLElement.Script.Type (“type”) equals “text/javascript” –> Stop Rule Set – Set User-Defined.removeOneScript = true The rule uses the HTMLElement.Script.Type property to check whether an element is of the JavaScript type. If it does, the rule applies. Processing of the rule set stops then, so the rule that removes script code at the end of the rule set is not processed. This way, the embedded script code is kept in the HTLM page. Processing continues with the next rule set. If you want to remove JavaScript code, replace the Stop Rule Set by the Remove action. The rule also sets the User-Defined.removeOneScript property to true. This property is evaluated by the break rule that follows this JavaScript rule. When this rule applies with Stop Rule Set or Remove as its action, processing of the rule set is stopped. If you let the rule use an action that does not stop the rule set, you can enable the break rule. It will find that the value for the User-Defined.removeOneScript property is true and stop processing of the rule set accordingly. To reset the value of the User-Defined.removeOneScript property to false, you need to enable the reset rule at the beginning of the rule set. With this value for the property, the break rules of the rule set will not apply. 210 McAfee Web Gateway 7.1.5 Product Guide
Break; User-Defined.removeOneScript equals true –> Stop Rule Set Web filtering HTML filtering 6 The rule stops processing of the rule set if the User-Defined.removeOneScript property has true as its value. Processing continues with the next rule set. Note: This rule is not enabled by default. JScript HTMLElement.Script.Type equals “text/jscript” –> Stop Rule Set – Set User-Defined.removeOneScript = true This rule removes or keeps JScript within HTML pages in the same way as the JavaScript rule. Break; User-Defined.removeOneScript equals true –> Stop Rule Set This rule works in the same way as the break rule that follows the JavaScript rule. Note: This rule is not enabled by default. Visual Basic script HTMLElement.Script.Type “text/vbscript” equals “vbscript” –> Stop Rule Set – Set User-Defined.removeOneScript = true This rule removes or keeps JScript within HTML pages in the same way as the JavaScript rule. Break; User-Defined.removeOneScript equals true –> Stop Rule Set This rule works in the same way as the break rule that follows the JavaScript rule. Note: This rule is not enabled by default. Other scripts Always –> Remove The rule removes all embedded script code from HTML pages, unless it is kept from doing so by one of the rules preceding it in the rule set. These can stop the rule set before the process reaches the removing rule. They can do so for JavaScript, JSCript, and Visual Basic script code if enabled. If you want this to happen for other script code as well, you can add appropriate rules. The break rules of the rule set can also stop it and let the removing rule not be processed. If the removing rule is processed, it stops processing of the embedded objects cycle. Processing then continues with the next cycle. McAfee Web Gateway 7.1.5 Product Guide 211
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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 159 and 160: Authentication and access managemen
Page 165 and 166: Administrator accounts Authenticati
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
Page 181 and 182: Module for virus and malware filter
Page 187 and 188: URL filtering Web filtering URL fil
Page 189 and 190: Web filtering URL filtering 6 The B
Page 191 and 192: Modify a filtering rule to block un
Page 193 and 194: Web filtering URL filtering 6 Add a
Page 195 and 196: Module for URL filtering Web filter
Page 197 and 198: Web filtering URL filtering 6 Advan
Page 199 and 200: Different versions of URL category
Page 201 and 202: Web filtering Media type filtering
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Page 205 and 206: Lists for media type filtering Web
Page 207 and 208: HTML filtering Web filtering HTML f
Page 209: Web filtering HTML filtering 6 Embe
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
Page 227 and 228: 8 Click OK. The window closes and t
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Page 231 and 232: Bandwidth throttling Web filtering
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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 251 and 252: License system settings System conf
Page 253 and 254: Network Protection system settings
Page 255 and 256: System configuration System setting
Page 257 and 258: Database updates Table 7-13 File Ed
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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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