Installing squidGuard
If no errors occurred squidGuard is now installed in /usr/local/. There are a couple of option you can use when running ./configure. For example:
When installed from the sources the BerkeleyDB will be located in /usr/local/BerkeleyDBx.y with x.y denoting the version number. Annotation: Make sure that the shared library of your BerkeleyDB installation is known by your system (check /etc/ld.so.conf, add your BerkeleyDB library path if it is not already there and run ldconfig).
Now the blacklists should be ready to use. Congratulation. You have just completed the installation of squidGuard. The next step is to configure the software according to your needs. After this you should verify your installation before you finally modify your squid configuration to work with squidGuard. |
Once SquidGuard is successfully installed, you want to configure the software according to your needs. A sample configuration has been installed in the default directory /usr/local/squidGuard (or whatever directory you pointed your installation to).
Below you find three examples for the basic configuration of SquidGuard.
Below you find three examples for the basic configuration of SquidGuard.
- Most simple configuration
| Most simple config uration: one category, one rule for all |
# # CONFIG FILE FOR SQUIDGUARD # dbhome /usr/local/squidGuard/db logdir /usr/local/squidGuard/logs dest porn { domainlist porn/domains urllist porn/urls }acl { default { pass !porn all redirect http://localhost/block.html }} |
Make always sure that the very first line of your squidGuard.conf is not empty!
The entries have the following meaning:
| dbhome | Location of the blacklists |
| logdir | Location of the logfiles |
| dest | Definition of a category to block. You can enter the domain and url file along with a regular expression list (talk about regular expressions later on). |
| acl | The actual blocking defintion. In our example only the default is displayed. You can have more than one acl in place. The category porn you defined in dest is blocked by the expression !porn. You have to add the identifier all after the blocklist or your users will not be able to surf anyway. The redirect directive is madatory! You must tell SquidGuard which page to display instead of the blocked one. |
- Choosing more than one category to block
First you define your categories. Just like you did above for porn. For example:
| Defining three categories for blocking |
dest adv {domainlist adv/domains urllist adv/urls } dest porn {domainlist porn/domains urllist porn/urls } dest warez {domainlist warez/domains urllist warez/urls } |
Now your acl looks like that:
acl { default {pass !adv !porn !warez all redirect http://localhost/block.html }} |
- Whitelisting
Sometimes there is a demand to allow specific URLs and domains although they are part of the blocklists for a good reason. In this case you want to whitelist these domains and URLs.
| Defining a whitelist |
dest white {domainlist white/domains urllist white/urls } acl { default {pass white !adv !porn !warez all redirect http://localhost/block.html }} |
In this example we assumed that your whitelists are located in a directory called white whithin the blacklist directory you specified with dbhome.
Make sure that your white identifier is the first in the row of the pass directive. It must not have an exclamation mark in front (otherwise all entries belonging to white will be blocked, too).- Initializing the blacklists
Before you start up your squidGuard you should initialize the blacklists i.e. convert them from the textfiles to db files. Using the db format will speed up the checking and blocking.
The initialization is performed by the following command:
| Initializing the b lacklists |
squidGuard -C all chown -R <squiduser> /usr/local/squidGuard/db/* |
The second command ensures that your squid is able to access the blacklists. Please for <squiduser> the uid of your squid.
Depending on the size of your blacklists and the power of your computer this may take a while. If anything is running fine you should see something like the following output in your logfile:
2006-01-29 12:16:14 [31977] squidGuard 1.2.0p2 started (1138533256.959) 2006-01-29 12:16:14 [31977] db update done 2006-01-29 12:16:14 [31977] squidGuard stopped (1138533374.571) |
If you look into the directories holding the files domains and urls you see that additional files have been created: domains.db and urls.db. These new files must not be empty!
Only those files are converted you specified to block or whitelist in your squidGuard.conf file.
Verification of your squidGuard Configuration
| Now that you have installed and configured your squidGuard you just check a couple of things before going online.
Finalizing the installation by configuring squid If everything is working properly add the following line to your squid.conf (assuming that your squidGuard is installed in /usr/local; make sure to change the paths to match your installation accordingly):
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