Snaptu: Your Willpower Is as Strong as You Think It Is, Study Says [Distractions]

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Squid+Dansguardian+ClamAV

I'll explain here how to setup a web proxy with antivirus capabilities We will use these tools : Squid + ClamAV + a patched version of DansGuardian We will be needing following tools to get this task done Squid : www.squid-cache.org ClamAV : www.clamav.net DansGuardian : dansguardian.org Note: You can download Squid rpm from the default RHEL/CentOS repo. Requirements for Squid: Squid should be running on port 3128 should only entertain request from localhost /etc/squid/squid.conf : http_port 3128 acl localhost src 127.0.0.0/255.0.0.0 http_access allow localhost http_access deny all Install DansGuardian with the antivirus plugin from SecurityTeam.us repo : Install the SecurityTeamUS repo : rpm -ihv http://repo.securityteam.us/repository/redhat/securityteamus-repo-latest.rpm Install DansGuardian-av and its dependencies (included on SecurityTeamUS) : yum install dansguardian-av Output : Setting up Install Process Setting up repositories SecurityTeamUS 100% |=========================| 951 B 00:00 Reading repository metadata in from local files primary.xml.gz 100% |=========================| 30 kB 00:00 SecurityTe: ################################################## 68/68 Added 68 new packages, deleted 0 old in 0.88 seconds Parsing package install arguments Resolving Dependencies --> Populating transaction set with selected packages. Please wait. ---> Downloading header for dansguardian-av to pack into transaction set. dansguardian-av-2.8.0.6-1 100% |=========================| 24 kB 00:00 ---> Package dansguardian-av.i386 0:2.8.0.6-1 set to be updated --> Running transaction check --> Processing Dependency: libclamav.so.1 for package: dansguardian-av --> Processing Dependency: clamd for package: dansguardian-av --> Processing Dependency: libesmtp.so.5 for package: dansguardian-av --> Processing Dependency: libesmtp for package: dansguardian-av --> Processing Dependency: clamav for package: dansguardian-av --> Restarting Dependency Resolution with new changes. --> Populating transaction set with selected packages. Please wait. ---> Downloading header for libesmtp to pack into transaction set. libesmtp-0.8.12-1.i386.rp 100% |=========================| 4.9 kB 00:00 ---> Package libesmtp.i386 0:0.8.12-1 set to be updated ---> Downloading header for clamd to pack into transaction set. clamd-0.88.7-1.i386.rpm 100% |=========================| 4.7 kB 00:00 ---> Package clamd.i386 0:0.88.7-1 set to be updated ---> Downloading header for clamav to pack into transaction set. clamav-0.88.7-1.i386.rpm 100% |=========================| 7.4 kB 00:00 ---> Package clamav.i386 0:0.88.7-1 set to be updated --> Running transaction check --> Processing Dependency: clamav-db = 0.88.7-1 for package: clamav --> Restarting Dependency Resolution with new changes. --> Populating transaction set with selected packages. Please wait. ---> Downloading header for clamav-db to pack into transaction set. clamav-db-0.88.7-1.i386.r 100% |=========================| 2.6 kB 00:00 ---> Package clamav-db.i386 0:0.88.7-1 set to be updated --> Running transaction check . Dependencies Resolved . ============================================================================= Package Arch Version Repository Size ============================================================================= Installing: dansguardian-av i386 2.8.0.6-1 SecurityTeamUS 309 k Installing for dependencies: clamav i386 0.88.7-1 SecurityTeamUS 944 k clamav-db i386 0.88.7-1 SecurityTeamUS 7.3 M clamd i386 0.88.7-1 SecurityTeamUS 64 k libesmtp i386 0.8.12-1 SecurityTeamUS 176 k . Transaction Summary ============================================================================= Install 5 Package(s) Update 0 Package(s) Remove 0 Package(s) Total download size: 8.8 M Is this ok [y/N]: y . Start ClamAV daemon : service clamd start By default, clamd should listen on 127.0.0.1:3310 Set up DansGuardian-av this way : reportinglevel = 3 languagedir = '/etc/dansguardian/languages' language = 'ukenglish' loglevel = 3 logexceptionhits = on logfileformat = 1 loglocation = '/var/log/dansguardian/access.log' filterip = filterport = 8080 proxyip = 127.0.0.1 proxyport = 3128 nonstandarddelimiter = on usecustombannedimage = 1 custombannedimagefile = '/etc/dansguardian/transparent1x1.gif' filtergroups = 1 filtergroupslist = '/etc/dansguardian/filtergroupslist' bannediplist = '/etc/dansguardian/bannediplist' exceptioniplist = '/etc/dansguardian/exceptioniplist' banneduserlist = '/etc/dansguardian/banneduserlist' exceptionuserlist = '/etc/dansguardian/exceptionuserlist' showweightedfound = on weightedphrasemode = 0 urlcachenumber = 3000 urlcacheage = 900 phrasefiltermode = 2 preservecase = 0 hexdecodecontent = 0 forcequicksearch = 0 reverseaddresslookups = off reverseclientiplookups = off createlistcachefiles = on maxuploadsize = -1 maxcontentfiltersize = 256 usernameidmethodproxyauth = on usernameidmethodident = off preemptivebanning = on forwardedfor = off usexforwardedfor = off logconnectionhandlingerrors = on maxchildren = 120 minchildren = 8 minsparechildren = 4 preforkchildren = 6 maxsparechildren = 32 maxagechildren = 500 ipcfilename = '/tmp/.dguardianipc' urlipcfilename = '/tmp/.dguardianurlipc' pidfilename = '/var/run/dansguardian.pid' nodaemon = off nologger = off daemonuser = 'nobody' daemongroup = 'nobody' softrestart = off virusscan = on virusengine = 'clamav' tricklelength = 32768 forkscanlength = 32768 firsttrickledelay = 10 followingtrickledelay = 10 maxcontentscansize = 41904304 virusscanexceptions = on urlcachecleanonly = on virusscannertimeout = 60 notify = 2 # will notify the admin only emaildomain = 'domain.be' postmaster = 'admin@domain.be' emailserver = '127.0.0.1:25' downloaddir = '/tmp/dgvirus' clmaxfiles = 1500 clmaxreclevel = 3 clmaxfilesize = 10485760 clblockencryptedarchives = off cldetectbroken = off clamdsocket = '127.0.0.1:3310' This is my configuration, please review it to match your needs Make sure dansguardian will start at boot : chkconfig dansguardian on Start DansGuardian : service dansguardian start Now, you can set up your browser preference to use the antivirus web proxy (IP:8080) If you want to set dansguardian as a transparent proxy : 1. Edit /etc/squid/squid.conf and add : httpd_accel_host virtual httpd_accel_port 80 httpd_accel_with_proxy on httpd_accel_uses_host_header on 2. Type this at the command prompt (where your local subnet is 10.0.0.0/24 and your LAN interface is eth0) : iptables -t nat -A PREROUTING -i eth0 -s 10.0.0.0/24 -p tcp --dport 80 -j REDIRECT --to-port 8080 3. Save your iptables configuration, type : iptables-save > /etc/sysconfig/iptables Squid logs can be tailed here : tail -f /var/log/squid/access.log DansGuardian logs can be tailed here : tail -f /var/log/dansguardian/access.log

Weird facts about technology:

• It’s impossible for your computer to be infected by a virus, just from opening an email message.
• 70% of virus writers actually work under a contract for an organization.
• Bulletproof vests, fire escapes, windshield wipers, and laser printers were all invented by women.
• Leonardo DA Vinci invented the scissors.
• Close to 60% of the radiation that comes from a mobile phone goes directly to the users head.
• The web, not indexed by search engines is said to be 500 times bigger than the current size of the indexed web.
• The original URL for Yahoo was was http://akebono.stanford.edu/
• The name of the search engine Alta Vista came into existence when the word Vista was misinterpreted as “Alta Vista” on a white board.
• Up until the 14th of September, 1995, domain registration was free.
• The average person receives around 30 emails a day, 3 of these being spam.
• Billions of hours are wasted online, spent, waiting for content to download.
• The first “modern” computer was built in 1941 by Konrad Zuse in World War 2. He looked to funding from the Germans but was denied because they did not expect the war to last beyond Christmas.