We’ll start by installing Squid:
> 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):
#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:
cache_dir ufs /usr/local/squid/var/cache 768 16 256
This defines a cache of not more then 768MB of disk storage.
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.
