We’ll start by installing Squid:
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> cd /root > wget http://www.squid-cache.org/Versions/v2/2.5/squid-2.5.STABLE3.tar.gz > tar -xvzf squid-2.5.STABLE3.tar.gz > cd squid-2.5.STABLE3 > ./configure > make > make install > cd /root > rm -rf squid-2.5.STABLE3 > mkdir archive > mv squid-2.5.STABLE3.tar.gz archive |
Squid is now installed at /usr/local/squid.
Notice that we use the “wget” command to download the software. Then we unpack and build the software. The build sequence is very typical for Linux packages – configure, make, make install.
We finish up by saving the distribution to /root/archive and removing the build
directory that is no longer needed.
Configuration for squid is pretty simple in the basic case. All configuration is
stored in a single file located at /usr/local/squid/etc/squid.conf.
The squid.conf file can be edited with your favoriate text editor. All though there
are hundreds of configuration options only a few are needed in a basic install. We made the following changes:
a. Find the line that looks like this (approx line 684):
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#cache_dir ufs /usr/local/squid/var/cache 100 16 256 |
Remove the “#” comment from the begining of the line and set the desired cache size and location:
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cache_dir ufs /usr/local/squid/var/cache 768 16 256 |
This defines a cache of not more then 768MB of disk storage.
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b. Find the line that looks like this (approx line 1760): # INSERT YOUR OWN RULE(S) HERE TO ALLOW ACCESS FROM YOUR CLIENTS Below this line add the following lines: acl our_networks src 172.0.0.0/8 http_access allow our_networks acl my_network src 127.0.0.1 http_access allow my_network The first new line defines an access control list (acl) called "our_networks" which includes the listed address ranges. The second line tells squid to accept connections from the "our_networks" acl. The next two lines allow access through the loopback address. c. Find the line (approx line 1973): # cache_effective_user nobody Uncomment this line and change the username to squid. Then add a line to set the group: cache_effective_user squid cache_effective_group squid For a basic setup that is all that is required in the way of configuration. Next well prepare the cache directories and start the proxy server. Type: > chown --recursive squid.squid cache > chown --recursive squid.squid logs > /usr/local/squid/sbin/squid -z This command may take several minutes to complete. Now start the server with: > /usr/local/squid/sbin/squid You can verify that squid is running by checking the log files: > tail /var/log/messages Now we can add a service control script to /etc/init.d. A suitable script can be downloaded from Reliable Penguin: > wget http://www.reliablepenguin.com/clients/misc/simplesquidguard.rh9.squid.service > mv simplewquidguard.rh9.squid.service /etc/init.d/squid > chmod 755 /etc/init.d/squid And finally squid can be set to start on bootup: > cd /etc/rc.d/rc5.d > ln -s ../init.d/squid S25squid > ln -s ../init.d/squid K25squid Next we want to install SquidGuard but it requires the BerkeleyDB database library package so we'll install it first: > cd /root > wget http://www.sleepycat.com/update/snapshot/db-3.3.11.tar.gz > tar -xvzf db-3.3.11.tar.gz > cd db-3.3.11 > cd build_unix > ../dist/configure > make > make install > ldconfig > cd /root > rm -rf db-3.3.11 > mv db-3.3.11.tar.gz archive The build procedure for BerkeleyDB is a little unusual - notice the directory that we change into before running configure. Also notice that we are using a 3.x version of BerkeleyDB. The current release if 4.X but SquidGuard needs the older version. Now we can download and install SquidGuard: > wget http://ftp.teledanmark.no/pub/www/proxy/squidGuard/squidGuard-1.2.0.tar.gz > tar -xvzf squidGuard-1.2.0.tar.gz > cd squidGuard-1.2.0 > ./configure --with-db=/usr/local/BerkeleyDB.3.2 > make > make install > mkdir /usr/local/squidGuard > mkdir /usr/local/squidGuard/logs > cp samples/sample.conf /usr/local/squidGuard And now squidGuard is installed. Now lets configure squid to utilize squidGuard. We'll need to edit the squid.conf file at /usr/local/squid/squid.conf. Look for the line: # TAG: redirect_program Below this section add this line: redirect_program /usr/local/bin/squidGuard And restart squid: > service squid restart Now squid will load and use squidGuard. Next lets install the blacklists: > cd /usr/local/squidGuard > wget http://ftp.teledanmark.no/pub/www/proxy/squidGuard/contrib/blacklists.tar.gz > tar -xvzf blacklists.tar.gz > chmod --recursive g+w blacklists > chown --recursive squid.squid blacklists The next step is to configure squidGuard. We'll start with a very basic setup and then expand it later using the webmin interface. Create a new file at /usr/local/squidGuard/squidGuard.conf with the following contents: logdir /usr/local/squidGuard/logs dbhome /usr/local/squidGuard/blacklists source localnet { ip 172.0.0.0/8 } source localhost { ip 127.0.0.1 } dest ads { domainlist ads/domains urllist ads/urls #expressionlist ads/expressions } dest audio-video { domainlist audio-video/domains urllist audio-video/urls #expressionlist audio-video/expressions } dest gambling { domainlist gambling/domains urllist gambling/urls #expressionlist gambling/expressions } dest mail { domainlist mail/domains #urllist mail/urls #expressionlist mail/expressions } dest proxy { domainlist proxy/domains urllist proxy/urls #expressionlist proxy/expressions } dest violence { domainlist violence/domains urllist violence/urls expressionlist violence/expressions } dest aggressive { domainlist aggressive/domains urllist aggressive/urls #expressionlist aggressive/expressions } dest drugs { domainlist drugs/domains urllist drugs/urls #expressionlist drugs/expressions } dest hacking { domainlist hacking/domains urllist hacking/urls #expressionlist hacking/expressions } dest porn { domainlist porn/domains urllist porn/urls expressionlist porn/expressions } dest warez { domainlist warez/domains urllist warez/urls #expressionlist warez/expressions } acl { localnet { pass !porn all redirect http://www.acme.net } localhost { pass !porn all redirect http://www.acme.net } default { pass !porn all redirect http://www.acme.net } } Save the file. Next let's set permissions: > cd /usr/local/squidGuard > chown --recursive squid.squid * Restart squid: > service squid restart Now squidGuard is running. Next lets install webmin. Webmin can be downloaded from: http://www.webmin.com We'll use the RPM to simplify the install. The install goes like this: > wget http://unc.dl.sourceforge.net/sourceforge/webadmin/webmin-1.100-1.noarch.rpm > rpm -U webmin-1.100-1.noarch.rpm That's about it. Webmin is now installed on the server and can be accessed on port 10000. The default user is "root" and the password is the same as the root password. Webmin includes a module for managing Squid by default so there is nothing to add. We just need to configure the module to know where our install of Squid is located. Follow these steps: 1. Login to Webmin 2. Click the Servers icon on the top menu bar. 3. Click the Squid Proxy Server icon. 4. Click the Module Config link under the top menu bar. 5. In the "System Configuration" section of the module config form set the following: a. Full path to squid config file ==> /usr/local/squid/etc/squid.conf b. Squid executable ==> /usr/local/squid/sbin/squid c. Full path to PID file ==> /usr/local/squid/var/log/squid.pid d. Full path to Squid cache directory ==> /usr/local/squid/var/cache e. Squid cachemgr.cgi executable ==> /usr/local/squid/libexec/cachemgr.cgi f. Full path to squid log directory ==> /usr/local/squid/var/logs 6. Click the save button at the bottom of the form. That does it. Now Webmin can be used to manage Squid. Next lets install a webmin module for managing SquidGuard. 1. Login to Webmin 2. Click the "Webmin" icon in the top menu bar. 3. Click the "Webmin Configuration" icon. 4. Click the "Webmin Modules" icon. 5. Complete the "Install Module" form as follows: a. Select "From FTP or HTTP URL" and enter the url: http://www.niemueller.de/webmin/modules/squidguard/squidguard-0.91.2.wbm.gz b. Select "Grant access only to users and groups" and enter "root". c. Press the "Install Module From File" button. Next to configure the module: 1. Login to Webmin 2. Click the "Servers" icon in the top menu bar. 3. Click the "SquidGuard" icon. 4. Click the "Module Config" link below the top menu bar. 5. Complete the form as follows: a. Full path to Squidguard configuration file ==> /usr/local/squidGuard/squidGuard.conf b. Full path to binary for SquidGuard ==> /usr/local/bin/squidGuard c. Full path to PID file of Squid ==> /usr/local/squid/var/log/squid.pid d. User the Squid runs as ==> squid e. Group that Squid runs as ==> squid f. Use database to extract user information ==> No g. Press the Save button. And that takes care of the squidGuard module for Webmain. |