Web Gateway 7.1.5 Product Guide - McAfee

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3 Proxies and caching Reverse HTTPS proxy configuration Reverse HTTPS proxy configuration You can use a reverse HTTPS proxy configuration to prevent clients from uploading unwanted data, such as malware or particular media types, to particular web servers under the HTTPS protocol. This section explains such a configuration and tells you how to set it up. In a reverse HTTPS proxy configuration, HTTPS traffic is redirected to the appliance, which serves as a proxy that inspects the traffic and eventually forwards or blocks it, according to the rules that are implemented. You can configure this in the following ways: • A transparent bridge or router configuration • A DNS configuration that points directly to the appliance when access to a particular web server is requested Note: The redirection to the appliance can also be achieved by configuring proxy-aware connections relying on the use of CONNECT headers. However, this method would require an additional network device to assemble these headers for incoming requests, so it is not recommended and further explained here. In addition to configuring your network in one of these ways, you need to configure the handling of SSL certificates. Optionally, you can configure some additional settings that are not SSL-related to ensure a smooth operation of the reverse HTTPS proxy configuration. Redirect HTTPS traffic in a transparent bridge or router configuration In a transparent bridge or router configuration, you can use a port redirect rule to direct HTTPS traffic to the proxy port on the appliance. Note: The term port forwarding rule is also used for a port redirect rule. Furthermore, you need to ensure that the redirected requests are treated as SSL-secured communication. 1 Go to Configuration | Appliances. 2 On the appliances tree, go to the appliance you want to redirect traffic to and select Proxies (HTTP(S), FTP, ICAP, and IM). 3 In the Network Setup section, select Transparent bridge (or Transparent router). The section with the transparent bridge (or router) settings appears. 4 Under Port redirects, click Add. The Add Port Redirects window opens. 5 Configure the following for the new port redirect rule: • Protocol name — http Note: This setting covers connections under both the HTTP and HTTPS protocols. • Original destination ports — 443 Note: If the web servers that are the destinations for requests can be reached under the HTTP protocol as well, you can add port 80 here (separated by a comma). This type of traffic is then also directed to the appliance. • Destination proxy port — 9090 Note: This is by default the proxy port on the appliance. 6 Click OK. The window closes and the new port redirect rule is added to the list. 7 Under HTTP proxy port, make sure Enable HTTP proxy is selected and click Add. The Add HTTP Proxy Port window opens. 60 McAfee Web Gateway 7.1.5 Product Guide
8 Make sure the following is configured: • Serve transparent SSL connections — Selected • Ports treated as SSL — 443 Proxies and caching Reverse HTTPS proxy configuration 3 9 Leave the other settings at their default values and click OK. The window closes and an appropriately configured HTTP proxy port is added to the list. 10 Click Save Changes. For more information on setting up a transparent bridge or router configuration, see Transparent bridge mode and Transparent router mode. Let the appliance listen to requests redirected by DNS entries When web server requests under the HTTPS protocol are redirected to the appliance according to DNS entries, you can configure the appliance as a proxy that listens directly on the appropriate port. You also need to ensure that only SSL-secured connections are served. Note: A port redirect rule cannot be applied here since its purpose would be forwarding requests for other destinations to the appliance. However, due to the DNS entries, the appliance is already the destination. Before you begin to configure the appliance in this way, make sure of the following: • The host names of the web servers are not resolved to the appliance when the appliance does a DNS lookup. You can achieve this by entering the IP adresses of the web servers into the /etc/hosts file on the appliance or by using an appropriately configured internal DNS server. • A rule set that handles content inspection is implemented on the appliance and enabled. This rule set is typically provided as part of an overall SSL Scanner rule set under the default rule set system, as well as in the rule set library. To let the appliance listen to the redirected requests: 1 Go to Configuration | Appliances. 2 On the appliances tree, go to the appliance that should listen to requests and select Proxies (HTTP(S), FTP, ICAP, and IM). 3 Under HTTP proxy port, make sure Enable HTTP proxy is selected and click Add. The Add HTTP Proxy Port window opens. 4 Configure the following settings: • Listener address — 0.0.0.0:443 This setting lets the appliance listen to requests for any web servers, regardless of their IP addresses. You can also specify a particular IP address here and restrict the appliance to listening for requests to the server in question. If you are running several network interface cards on your appliance, you can specify IP addresses (separated by commas) for as many web servers as there are network interface cards. • Serve transparent SSL connections — Selected • Ports treated as SSL — * 5 Leave the other settings at their default values and click OK. The window closes and an appropriately configured HTTP proxy port is added to the list. Note: If a web server should also be accessible under the HTTP protocol, you need to add another HTTP proxy port with listener address 0.0.0.0:80 or the address of a particular web server. 6 Click Save Changes. McAfee Web Gateway 7.1.5 Product Guide 61
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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 .
Page 9 and 10: Preface About this guide This Produ
Page 11 and 12: Table i-2 Acronyms (continued) Acro
Page 13 and 14: 1 Introduction Contents Comprehensi
Page 15 and 16: Deployment of the McAfee Web Gatewa
Page 17 and 18: Operating system Introduction Filte
Page 19 and 20: Introduction Chapters of this guide
Page 21 and 22: 2 Setup and logon Contents Setting
Page 23 and 24: Setup and logon Setting up the McAf
Page 25 and 26: Installing the appliance software S
Page 27 and 28: 2 Review the summary that is displa
Page 29 and 30: Import a license Setup and logon Lo
Page 31 and 32: Main elements of the user interface
Page 33 and 34: Setting up system management tools
Page 35 and 36: Setup and logon Setting up system m
Page 37 and 38: 3 Proxies and caching Contents Inte
Page 39 and 40: Explicit proxy mode Proxies and cac
Page 41 and 42: Table 3-1 WCCP Services list (conti
Page 43 and 44: Proxies and caching Network modes 3
Page 45 and 46: Transparent bridge mode Proxies and
Page 49 and 50: Transparent router mode Proxies and
Page 53 and 54: Common proxy settings Proxies and c
Page 55 and 56: Proxies and caching Common proxy se
Page 57 and 58: Proxies and caching Common proxy se
Page 59: Proxies and caching Common proxy se
Page 63 and 64: Proxies and caching Reverse HTTPS p
Page 71 and 72: Proxies and caching Providing proxy
Page 73 and 74: Preventing data leaks Proxies and c
Page 75 and 76: Web caching Proxies and caching Web
Page 77 and 78: Bypass lists for web caching Proxie
Page 79 and 80: Verify the enabling of the web cach
Page 81 and 82: 4 Rules and rule sets Contents Filt
Page 83 and 84: Rules and rule sets Filtering contr
Page 85 and 86: Modules for delivering filtering in
Page 87 and 88: Rules on the user interface On the
Page 89 and 90: Property of a URL Property — URL.
Page 91 and 92: About rule sets Rules and rule sets
Page 93 and 94: Rules and rule sets About rule sets
Page 95 and 96: Table 4-4 Rule set library Rule set
Page 97 and 98: The Rule Sets toolbar provides the
Page 99 and 100: Add name, comment, and enabling Com
Page 101 and 102: Add as many parameters as needed. A
Page 103 and 104: 3 Select Event. The Add Event windo
Page 105 and 106: Adding the action 9 Select Action.
Page 107 and 108: Rules and rule sets Rule configurat
Page 109 and 110: 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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Administrator accounts Authenticati
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6 Web filtering Contents Filtering
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Virus and malware filtering Web fil
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Web filtering Virus and malware fil
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Whitelists for virus and malware fi
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Module for virus and malware filter
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URL filtering Web filtering URL fil
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Web filtering URL filtering 6 The B
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Modify a filtering rule to block un
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Web filtering URL filtering 6 Add a
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Module for URL filtering Web filter
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Web filtering URL filtering 6 Advan
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Different versions of URL category
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Web filtering Media type filtering
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Web filtering Media type filtering
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Lists for media type filtering Web
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HTML filtering Web filtering HTML f
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Web filtering HTML filtering 6 Embe
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Break; User-Defined.removeOneScript
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Media Type String Blocklist List of
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Global whitelists Web filtering Glo
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Web filtering SSL scanning 6 Handle
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Block untrusted certificate authori
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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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