SonicWALL Content Filtering Service - SonicGuard

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content filter.book Page 1 Thursday, May 15, 2003 5:00 PMSonicWALLContent Filtering ServiceUser’s Guide

content filter.book Page 1 Thursday, May 15, 2003 5:00 PMTable of ContentsCopyright Notice . 3Limited Warranty. 3SonicWALL Technical Support . 4Introduction . 5Activating Content Filtering Service from the Security ServicesTab. 6Activating SonicWALL Content Filtering Service usingmySonicWALL.com . 8What is mySonicWALL.com? . 8What Can I Do with mySonicWALL.com? . 8How do I Get Started with mySonicWALL.com? . 8Activating the Content Filtering Service Subscription . 8Managing Content Filtering. 10Accessing the SonicWALL using a Web Browser . 10Configuring SonicWALL Content Filtering Service . 11Content Filter Type . 11Restrict Web Features . 12Block: . 12Message to display when a site is blocked . 12Configuring CFS Settings . 13Settings. 13URL Cache . 14URL List . 14Select Categories to block . 14Customizing the Content Filtering List . 15Custom Filter . 15Allowed Domains . 16Forbidden Domains . 16Keywords . 16Deleting Allowed Domains, Forbidden Domains,or Keywords . 16Time of Day . 17Consent . 17Web Usage Consent Page . 18Mandatory Filtered IP Addresses . 19Users . 20Global User Settings . 20Users . 21Adding and Removing a User . 22Page 1

content filter.book Page 2 Thursday, May 15, 2003 5:00 PMPage 2 SonicWALL Content Filter Service User’s Guide

content filter.book Page 3 Thursday, May 15, 2003 5:00 PMCopyright Notice 2003 SonicWALL, Inc. All rights reserved.Under the copyright laws, this manual or the software described within,can not be copied, in whole or part, without the written consent of themanufacturer, except in the normal use of the software to make abackup copy. The same proprietary and copyright notices must beaffixed to any permitted copies as were affixed to the original. Thisexception does not allow copies to be made for others, whether or notsold, but all of the material purchased (with all backup copies) can besold, given, or loaned to another person. Under the law, copyingincludes translating into another language or format.SonicWALL is a registered trademark of SonicWALL, Inc.Other product and company names mentioned herein can betrademarks and/or registered trademarks of their respectivecompanies.Specifications and descriptions subject to change without notice.Limited WarrantySonicWALL, Inc. warrants that SonicWALL Network Anti-Virus willperform in accordance to the accompanying written materials for aperiod of ninety (90) days from the date of receipt.SonicWALL Inc.’s and its suppliers’ entire liability and your exclusiveremedy shall be, at SonicWALL’s option, either a) return of the pricepaid, or b) repair or replacement of the PRODUCT that does not meetSonicWALL’s Limited Warranty and which is returned to SonicWALLwith a copy of your receipt. This Limited Warranty is void if failure ofthe PRODUCT has resulted from accident, abuse, or misapplication.Any replacement PRODUCT shall be warranted for the remainder ofthe original warranty period or thirty (30) days, whichever is longer.In no event shall SonicWALL or its suppliers be liable for any damageswhatsoever (including, without limitation, special, incidental, indirect,or consequential damages for loss of business profits, businessinterruption, loss of business information, or any other pecuniary loss)arising out of the use of or inability to use the PRODUCT.Some states do not allow the exclusion or limitation of impliedwarranties or liability for incidental or consequential damages, so theabove limitation or exclusion may not apply to you. Where liability maynot be limited under applicable law, SonicWALL’s liability shall belimited to the amount you paid for the Product. This warranty gives youspecific legal rights, and you may have other rights which vary fromstate to state.By using this Product, you agree to these limitations of liability.Page 3

content filter.book Page 4 Thursday, May 15, 2003 5:00 PMTHIS WARRANTY AND THE REMEDIES SET FORTH ABOVE AREEXCLUSIVE AND IN LIEU OF ALL OTHER WARRANTIES, ORALOR WRITTEN, EXPRESS OR IMPLIED.No dealer, agent, or employee of SonicWALL is authorized to makeany extension or addition to this port:http://www.sonicwall.com/support/This warranty does not apply if the SonicWALL is damaged byaccident, abuse, misuse, misapplication, or is modified without thewritten permission of SonicWALL, Inc.In no event shall SonicWALL, Inc. or its suppliers be liable for anydamages, whatsoever (including, without limitation, damages for lossof profits, business interruption, loss of information, or other pecuniaryloss) arising out of the use of the SonicWALL, or the inability to use theSonicWALL.Some states do not allow the exclusion or limitation of impliedwarranties or liability for incidental or consequential damages, so theabove limitation or exclusion may not apply to you. Where liability maynot be limited under applicable law, SonicWALL liability is limited to theamount paid for the product. This warranty gives you specific legalrights, and you may have other rights which vary from state to state.By using the SonicWALL Internet Security Appliance, you agree to thelimitations of liability.THIS WARRANTY AND THE REMEDIES SET FORTH ABOVE AREEXCLUSIVE AND IN LIEU OF ALL OTHER WARRANTIES, ORALOR WRITTEN, EXPRESSED OR IMPLIED.No dealer, agent, or employee of SonicWALL, Inc. is authorized tomake any extension or addition to this warranty.SonicWALL Technical SupportFor timely resolution of technical support questions, visit SonicWALLon the Internet at http://www.sonicwall.com/support . Resources areavailable to help you resolve most technical issues, as well as a wayto contact one of the SonicWALL Technical Support engineers.Phone:(408) 745-9600Fax:(408) onicwall.comPage 4 SonicWALL Content Filtering Service User’s Guide

content filter.book Page 5 Thursday, May 15, 2003 5:00 PMIntroductionThe SonicWALL Content Filtering Service helps organizationsincrease productivity and reduce legal and privacy risks byautomatically enforcing acceptable use policies while minimizingadministration overhead. Integrated with SonicWALL's line of Internetsecurity appliances, the SonicWALL Content Filtering Service enablesorganizations such as businesses, schools and libraries to maintainInternet access policies tailored to their specific needs.With SonicWALL Content Filtering Service, network administratorshave a flexible tool to provide comprehensive filtering based onkeywords, time of day, trusted and forbidden domain designations,and file types such as Cookies, Java and ActiveX for privacy. TheSonicWALL Content Filtering Service automatically updates the filters,making maintenance substantially simpler and less time consuming.SonicWALL Content Filtering can be customized to add or removespecific URLs from the blocked list and to block specific keywords.When a user attempts to access a site that is blocked by theSonicWALL, a customized message is displayed on the user’s screen.SonicWALL Internet security appliances can also be configured to logattempts to access sites on the SonicWALL Content Filter List, on acustom URL list, and on a keyword list to monitor Internet usagebefore putting new usage restrictions in place.Page 5

content filter.book Page 6 Thursday, May 15, 2003 5:00 PMActivating Content Filtering Service from theSecurity Services TabYou can also activate your Content Filtering Service from the SecurityServices tab. Click General, and then Security Services.Tip! If you have already activated your subscription, proceed toConfiguring Content Filtering.In the Security Services Activation section, click the link Activate YourSonicWALL Security Service Subscription. The mySonicWALL.comLogin page is displayed.Page 6 SonicWALL Content Filtering Service User’s Guide

content filter.book Page 7 Thursday, May 15, 2003 5:00 PMType your mySonicWALL.com user name and password in the UserName and Password fields. If you do not have a mysonicWALL.comaccount, click the link here to go to the registration page and create youraccount.When you log into your mySonicWALL.com account, the ManageServices Online page is displayed.Click Activate and type your activation key from the back of this manualinto the Activation Key field. Click Submit.Page 7

content filter.book Page 8 Thursday, May 15, 2003 5:00 PMActivating SonicWALL Content Filtering Serviceusing mySonicWALL.comBefore you can configure the SonicWALL Content Filtering Service,the subscription requires you to register your SonicWALL InternetSecurity Appliance at http://www.mysonicwall.com. At this web site,you can create a user account to activate and manage services for allof your SonicWALL Internet Security Appliances.For the latest version of this manual and other SonicWALLdocumentation, go to l What is mySonicWALL.com?mySonicWALL.com delivers a convenient, centralized way to registerall your SonicWALL Internet Security Appliances and SecurityServices and eliminates the hassle of registering individualSonicWALL appliances and upgrades. Using mySonicWALL.comallows you to have a single user profile where you can manage all yourproduct registrations and security services.What Can I Do with mySonicWALL.com?You can use mySonicWALL.com to do the following: Register all your SonicWALL appliances and services in one place. Access firmware and security service updates. Get SonicWALL alerts on services, firmware, and products. Check status of your SonicWALL services and upgrades linked toeach registeredSonicWALL Internet security appliance. Manage (activate, change or delete) your SonicWALL security services online.How do I Get Started with mySonicWALL.com?The first step to using mySonicWALL.com is creating a user account.Go to http://www.mysonicwall.com and follow the instructions forsetting up a new user account.Activating the Content Filtering ServiceSubscriptionTo activate the Content Filtering Service subscription, you must firstregister your activation key on the SonicWALL website at the SonicWALLregistration site http://www.mysonicwall.com. Follow the instructionsbelow to activate the Content Filtering Service subscription. Log into youruser account, and select the SonicWALL appliance to activate the ContentFiltering Service subscription. Click Activate next to Content Filtering inthe list of Applicable ServicesPage 8 SonicWALL Content Filtering Service User’s Guide

content filter.book Page 9 Thursday, May 15, 2003 5:00 PM.1. Type the Activation Key in the Activation Key field, and clickSubmit.2. Your Content Filtering Service subscription is activated.Page 9

content filter.book Page 10 Thursday, May 15, 2003 5:00 PMManaging Content FilteringThis section contains detailed information on the configuration of theSonicWALL Content Filtering feature. A Web browser is used to accessthe SonicWALL Management interface, and the commands and functionsof Content Filtering.The following sections are in this chapter: Accessing the SonicWALL using a Web browserEnabling Content Filtering and BlockingCustomizing Content FilteringBlocking URLs with KeywordsAccessing the SonicWALL using a Web BrowserOpen a Web browser and enter the SonicWALL IP address into theAddress field, then press Enter. When the Password dialogue boxappears, enter admin into the User Name field, and enter theadministrator password in the Password field. Click Login to open theManagement Station interface.Click General on the left side of the Management interface, and thenStatus.The active tab, Status, displays the current status of the SonicWALL. Itcontains an overview of the SonicWALL settings and configurations aswell as any messages generated by the SonicWALL. Be sure to review theStatus tab after making changes to the SonicWALL to verify that changesare updated by the SonicWALL.Page 10 SonicWALL Content Filtering Service User’s Guide

content filter.book Page 11 Thursday, May 15, 2003 5:00 PMIf the message, “This SonicWALL is not yet registered.”, is displayed, youmust complete the online registration process using the web-basedregistration form located at http://www.mysonicwall.com to register yourSonicWALL. After the SonicWALL is registered, you can activate yourContent Filtering List subscription by clicking Activate, and entering yourActivation Key from the back of this manual. Your SonicWALL can nowbe managed from the central registration Web site.Configuring SonicWALL Content FilteringServiceClick Filter on the left side of the browser window, and then click on theConfigure tab.Note: Content Filtering applies only to HTTP requests from devices behindthe SonicWALL LAN, DMZ, or both.Content Filter TypeSonicWALL CFS - Selecting SonicWALL CFS for the Content Filter ListType allows you use the CFS database and completely customize yourContent Filter feature including allowed and forbidden domains as well ascontent filtering using keywords.Page 11

content filter.book Page 12 Thursday, May 15, 2003 5:00 PMRestrict Web FeaturesBlock: ActiveXActiveX is a programming language that embeds scripts in Web pages.Malicious programmers can use ActiveX to delete files or compromisesecurity. Select the ActiveX check box to block ActiveX controls. JavaJava is used to download and run small programs, called applets, onWeb sites. It is safer than ActiveX since it has built-in securitymechanisms. Select the Java check box to block Java applets from thenetwork. CookiesCookies are used by Web servers to track Web usage and rememberuser identity. Cookies can also compromise users' privacy by trackingWeb activities. Select the Cookies check box to disable Cookies. Known Fraudulent CertificatesDigital certificates help verify that Web content and files originated froman authorized party. Enabling this feature protects users on the LANfrom downloading malicious programs warranted by these fraudulentcertificates. If digital certificates are proven fraudulent, then theSonicWALL blocks the Web content and the files that use thesefraudulent certificates.Known fraudulent certificates blocked by SonicWALL include twocertificates issued on January 29 and 30, 2001 by VeriSign to animpostor masquerading as a Microsoft employee. Access to HTTP Proxy ServersWhen a proxy server is located on the WAN, LAN users can circumventcontent filtering by pointing their computer to the proxy server. Checkthis box to prevent LAN users from accessing proxy servers on the WAN. Don’t Block Java/ActiveX/Cookies to Trusted DomainsSelect this option if you have trusted domains using Java, ActiveX, andCookies. To add a trusted domain, enter the domain name into the AddTrusted Domain field. Click Update to add the domain to the list oftrusted domains. To delete a domain, select it from the list, and then clickDelete.Message to display when a site is blockedEnter your customized text to display to the user when access to a blockedsite is attempted. The default message is Web Site blocked bySonicWALL Filter. Any message, including embedded HTML, up to 255characters long, can be entered in this field.Page 12 SonicWALL Content Filtering Service User’s Guide

content filter.book Page 13 Thursday, May 15, 2003 5:00 PMConfiguring CFS SettingsThe CFS page allows you to see the status of the CFS Server and theexpiration date of your subscription. You can also determine how theSonicWALL responds when the Content Filtering Service is unavailable.SettingsIf you have enabled blocking by Categories and the CFS Server isunavailable for a designated period of time (default value is 5 seconds),there are two options available: Block traffic to all web sites except for Allowed DomainsSelecting this option blocks traffic to all web sites until the CFS Server isavailable. Allow traffic to all web sitesSelecting this option allows traffic to all web sites. However, ForbiddenDomains and Keywords, if enabled, are still blocked.If you have enabled blocking by Categories and the URL is blocked by theserver, there are two options available: Block Access to URLSelecting this option prevents the browser from displaying the requestedURL to the user. Log Access to URLSelecting this option records the requested URL in the log file.Page 13

content filter.book Page 14 Thursday, May 15, 2003 5:00 PMURL CacheConfigure the size of the URL Cache in KB.ModelCache SizeApproximateNumber of SitesXPRS, PRO, SOHO2, TELE2,SOHO3, TELE3, and PRO-Vx1282,000PRO 230, PRO 330, PRO 100, PRO200, PRO 300, PRO2, PRO-VX22564,000GX250, GX650102416,000TIP! A larger URL Cache size can increase in noticeable improvements inInternet browsing response times.URL ListTo access URL List, click Filter, and then URL List.Select Categories to block Block all categoriesThe SonicWALL uses a URL List database to block access toobjectional Web sites. Objectional Web sites are classified basedupon input from a wide range of social, political, and civicorganizations. Select the Block all categories check box to block allof these categories. Alternatively, you can select categoriesindividually by selecting the appropriate check box.Page 14 SonicWALL Content Filtering Service User’s Guide

content filter.book Page 15 Thursday, May 15, 2003 5:00 PMThe following is a list of the Content Filtering Service categories:1. Violence7. Cult/Occult2. Intimate Apparel/Swimsuit8. Drugs/Illegal Drugs3. Nudism9. Criminal Skills/Illegal Skills4. Adult/Mature Content/Pornography10. Sex Education5. Weapons11. Gambling6. Hate/Racism12. Alcohol & TobaccoVisit .html#filters for adetailed description of the criteria used to define Content Filtering Servicecategories.Customizing the Content Filtering ListThe Customize tab allows you to customize Content Filtering by manuallyentering domain names or keywords to be blocked or allowed through theSonicWALL.Custom FilterYou can customize your URL list to include Allowed Domains, ForbiddenDomains, and Keywords. By customizing your URL list, you can includespecific domains to be allowed (accessed), forbidden (blocked), andinclude specific keywords to be used to block sites. Enable Allowed/Forbidden DomainsTo deactivate Custom Filter customization, clear the Enable Allowed/Forbidden Domains, and click Update. This option allows you toenable and disable customization without removing and re-enteringcustom domains.Page 15

content filter.book Page 16 Thursday, May 15, 2003 5:00 PM Enable Keyword BlockingSelect the Enable Keyword Blocking if you want to block Web trafficbased on your list of customized keywords. Disable all web traffic except for Allowed DomainsWhen the Disable Web traffic except for Allowed Domains check boxis selected, the SonicWALL only allows Web access to sites on theAllowed Domains list. With careful screening, this can be nearly 100%effective at blocking pornography and other objectional material.Allowed DomainsTo allow access to a Web site that is blocked by the Content FilteringService, type the host name, such as “www.ok-site.com”, into the AllowedDomains fields. 256 entries can be added to the Allowed Domains list.An Allowed Domain is not the same as a Trusted Domain. You may allowaccess to a domain (Allowed Domain), but block ActiveX, Java, cookies,etc.Forbidden DomainsTo block a Web site that is not blocked by the Content Filtering Service,type the host name, such as “www.bad-site.com” into the ForbiddenDomains field. 256 entries can be added to the Forbidden Domains list.Alert! Do not include the prefix “http://” in either the Allowed Domains orForbidden Domains the fields. All subdomains are affected. For example,entering “yahoo.com” applies to “mail.yahoo.com” and “my.yahoo.com”.KeywordsTo enable blocking using Keywords, select the Enable KeywordBlocking check box.Type the keyword to block in the Add Keyword field, and click Update.Once the keyword has been added, a message confirming the update isdisplayed at the bottom of the browser window.TIP! Customized domains do not have to be re-entered when the ContentFiltering Service is updated each week and do not require a URL listsubscription.Deleting Allowed Domains, Forbidden Domains, orKeywordsTo remove an Allowed Domain, select it from the appropriate list, andclick Delete Domain. Once the domain has been deleted, a message isdisplayed at the bottom of the Web browser window.To remove a Forbidden Domain, select it from the appropriate list, andclick Delete Domain. Once the domain has been deleted, a message isdisplayed at the bottom of the Web browser window.Page 16 SonicWALL Content Filtering Service User’s Guide

content filter.book Page 17 Thursday, May 15, 2003 5:00 PMTo remove a keyword, select it from the list and click Delete Keyword.Once the keyword has been removed, a message confirming the updateis displayed at the bottom of the browser window.Time of DayThe Time of Day feature allows you to define specific times when ContentFiltering Service is enforced. For example, you could configure theSonicWALL to filter employee Internet access during normal businesshours, but allow unrestricted access at night and on weekends.TIP! Time of Day restrictions only apply to the Content Filtering Service,Customized blocking and Keyword blocking. Consent and Restrict WebFeatures are not affected. Always BlockWhen selected, Content Filtering is enforced at all times. Block BetweenWhen selected, Content Filtering is enforced during the time and daysspecified. Enter the time period, in 24-hour format, and select thestarting and ending day of the week that Content Filtering is enforced.ConsentThe Consent tab allows you to enforce content filtering on designatedcomputers and provide optional filtering on other computers. Consentcan be configured to require the user to agree to the terms outlined inan Acceptable Use Policy window before Web browsing is allowed.Click Filter on the left side of the browser window, and then click theConsent tab.Page 17

content filter.book Page 18 Thursday, May 15, 2003 5:00 PMWeb Usage Consent Page Require ConsentSelect the Require Consent check box to enable the Consent features. Maximum Web usageIn an environment where there are more users than computers, such asa classroom or library, time limits are often imposed. The SonicWALLcan be used to remind users when their time has expired by displayingthe page defined in the Consent page URL field. Enter the time limit, inminutes, in the Maximum Web usage field. When the default value ofzero (0) is entered, this feature is disabled. User Idle Timeout is 5 minutes (configure here)After a period of Web browser inactivity, the SonicWALL requires theuser to agree to the terms outlined in the Consent page before anyadditional Web browsing is allowed. To configure the value, follow thelink to the Users window and enter the desired value in the User IdleTimeout section. Consent page URL (Optional Filtering)When a user opens a Web browser on a computer requiring consent,they are shown a consent page and given the option to access theInternet with or without content filtering. You must create this Web(HTML) page. It can contain the text from, or links to an Acceptable UsePolicy (AUP).This page must contain links to two pages contained in the SonicWALL,which, when selected, tell the SonicWALL if the user wishes to havefiltered or unfiltered access. The link for unfiltered access must be 192.168.168.168/iAccept.html and the link for filtered access must be 192.168.168.168/iAcceptFilter.html , where the SonicWALL LAN IPAddress is used instead of "192.168.168.168". “Consent Accepted” URL (Filtering Off)When a user accepts the terms outlined in the Consent page andchooses to access the Internet without the protection of ContentFiltering, they are shown a Web page confirming their selection. Typethe URL of this page in the “Consent Accepted” (Filtering Off) field.This page must reside on a Web server and be accessible as a URL byusers on the LAN. “Consent Accepted” URL (Filtering On)When a user accepts the terms outlined in the Consent page andchooses to access the Internet with the protection of Content Filtering,they are shown a Web page confirming their selection. Type the URL ofthis page in the “Consent Accepted” (Filtering On) field. This pagemust reside on a Web server and be accessible as a URL by users onthe LAN.Page 18 SonicWALL Content Filtering Service User’s Guide

content filter.book Page 19 Thursday, May 15, 2003 5:00 PMMandatory Filtered IP Addresses Consent page URL (Mandatory Filtering)When a user opens a Web browser on a computer using mandatorycontent filtering, a consent page is displayed. You must create the Webpage that appears when the web browser is opened. It can contain thetext from an Acceptable Use Policy, and notification that violations arelogged or blocked.This Web page must reside on a Web server and be accessible as aURL by users on the LAN. This page must also contain a link to a pagecontained in the SonicWALL that tells the SonicWALL that the useragrees to have filtering enabled. The link must be 192.168.168.168/iAcceptFilter.html , where the SonicWALL LAN IP Address is usedinstead of "192.168.168.168".Enter the URL of this page in the Consent page URL (MandatoryFiltering) field and click Update. Once the SonicWALL has beenupdated, a message confirming the update is displayed at the bottom ofthe Web browser window. Add New AddressThe SonicWALL can be configured to enforce content filtering forcertain computers on the LAN. Enter the IP addresses of thesecomputers in the Add New Address field and click Submit button. Upto 128 IP addresses can be entered.To remove a computer from the list of computers to be filtered,highlight the IP address in the Mandatory Filtered IP Addresses listand click Delete Address.Page 19

content filter.book Page 20 Thursday, May 15, 2003 5:00 PMUsersExtensive features are available on the Users tab in the Access sectionof the Management interface. User level access can be configured forauthentication, access to the network, and bypassing content filtering.Authentication can be performed using a local user database, RADIUS, ora combination of the two applications.Global User Settings Time users out after 5 minutes of inactivity - Enter the number ofallowable inactivity minutes before a user is automatically logged outof the network via the SonicWALL.Limit login session time to - Limit the length of time, in minutes, thata user is allowed to be logged into the network via the SonicWALL.When a user logs into the SonicWALL using a username andpassword, the user can also set the maximum login session time, butLAN it cannot be longer than the time configured by the administrator.If Limit login session time to is not selected, then the user hasunlimited login session time on the SonicWALL.Allow DNS access for unauthenticated VPN users - Enabling thischeck box allows unauthenticated DNS traffic to access the DNSserver over a VPN tunnel with authentication enforcement. Use thischeckbox if you allow unauthenticated users to access the DNS serveron your LAN.Restrict Internet access to privileged users - selecting this featureonly allows Internet access to users configured on the SonicWALL.Page 20 SonicWALL Content Filtering Service User’s Guide

content filter.book Page 21 Thursday, May 15, 2003 5:00 PMUsers Use RADIUS - Select Use Radius if you have configured RADIUS toauthenticate users accessing the network through the SonicWALL. Ifyou have more than 100 users requiring authentication, you must usea RADIUS server. If you select Use RADIUS, users must log into theSonicWALL using HTTPS in order to encrypt the password sent to theSonicWALL. If a user attempts to log into the

SonicWALL Content Filtering feature. A Web browser is used to access the SonicWALL Management interface, and the commands and functions of Content Filtering. The following sections are in this chapter: Accessing the SonicWALL using a Web browser Enabling Content Filtering and Blocking Customizing Content Filtering

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