Web Gateway 7.1.5 Product Guide - McAfee

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6 Web filtering SSL scanning SSL scanning 5 In the Wildcard expression field, type a wildcard expression. Note: To add multiple wildcard expressions at once, click Add multiple and type every wildcard expression in a new line. 6 [Optional] In the Comment field, type a comment on the wildcard expression. 7 Click OK. The window closes and the wildcard expression appears on the whitelist. 8 Click Save Changes. For more information on how to maintain a list, see List maintenance. For the types of wildcard expressions that are allowed in the list, see Wildcard expressions. SSL-secured requests can be inspected by an SSL scanning module before other appliance functions filter them. This section explains the SSL scanning process and tells you how you can modify it. The rules in a rule set for SSL scanning call the SSL scanning module to let it verify the certificates sent with SSL-secured requests. If certificate verification does not lead to blocking a request, the rules call the module to enable content inspection and have the request filtered by the other implemented rule sets. The rules also handle the CONNECT request that SSL-secured communication begins with if it does not use the transparent mode. Whitelists of hosts and certificates can be used to skip certificate verification and content inspection. Rules for SSL scanning To use SSL scanning on the appliance, a rule set containing appropriate rules must be implemented. This section describes a sample rule set from the library. A rule set for SSL scanning contains rules for handling the different types of requests that a client sends to the appliance in SSL-secured communication and for enabling certificate verification and content inspection. Other rules whitelist requests if, for example, the host or the certificate that a request is related to are on a whitelist. SSL Scanner This section describes the rules in a library rule set for SSL scanning. For general information on understanding and handling rules, see Rules and rule sets. Library rule set — SSL Scanner Criteria — Always Cycle — Requests (and IM) The following rule sets are nested in this rule set: • Handle Connect Call • Certificate Verification. • Verify Common Name (proxy setup) • Content Inspection • Verify Common Name (transparent setup) 216 McAfee Web Gateway 7.1.5 Product Guide
Web filtering SSL scanning 6 Handle CONNECT Call This nested rule set handles the CONNECT call in SSL-secured communication and enables certificate verification. Nested library rule set — Handle Connect Call Criteria — Command.Name equals “CONNECT” Cycle — Requests (and IM) The rule criteria specifies that the rule set applies if a request is received on the appliance that contains the CONNECT command, which is sent in the opening phase of SSL-secured connection. The rule set contains the following rules: Set client context Always –> Continue — Enable SSL Client Context with CA The rule enables the use of a server certificate that is sent to a client. The event settings specify the McAfee Web Gateway root certificate authority (CA), which is implemented on the appliance after the initial setup, as the default issuer of this certificate. Tunneled hosts URL.Host is in list SSL Host Tunnel List –> Stop Cycle The rule lets requests for access to hosts with a URL that is on the specified whitelist skip SSL scanning. Restrict destination ports to Allowed CONNECT Ports URL.Port is not in list Allowed Connect Ports –> Block The rule blocks requests with destination ports that are not on the list of allowed CONNECT ports. The action settings specify a message to the requesting user. Enable certificate verification without EDH for hosts in no-EDH server list URL.Host is in list No-EDH server –> Stop Rule Set — Enable SSL Scanner The rule enables the certificate verification for requests sent from a host on the no-EDH (Ephemeral Diffie-Hellman) server list. The event settings specify running in verification mode for the SSL scanning module and a special cipher string for data encryption on non-EDH hosts. Enable certificate verification Always –> Stop Rule Set — Enable SSL Scanner The rule enables certificate verification. The event settings specify that the SSL scanning module runs in verification mode. McAfee Web Gateway 7.1.5 Product Guide 217
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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 165 and 166: Administrator accounts Authenticati
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Page 169 and 170: 6 Web filtering Contents Filtering
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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 211 and 212: Break; User-Defined.removeOneScript
Page 213 and 214: Media Type String Blocklist List of
Page 215: Global whitelists Web filtering Glo
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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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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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