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Download blacklist squidguard: A fast and free way to integrate blacklists with Squid proxy software


How to Download and Install SquidGuard for Web Filtering




Web filtering is a useful technique for controlling what websites users can access on a network. It can help improve security, productivity, bandwidth, and compliance. However, web filtering can also be a challenging task, especially if you have a large number of users with different needs and preferences.




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Fortunately, there is a free and open source solution that can help you with web filtering: SquidGuard. SquidGuard is a plugin for Squid, a popular web proxy server for Linux. It allows you to define various access rules and filters based on blacklists, categories, keywords, time, IP addresses, and more. It is fast, flexible, and easy to use.


In this article, we will show you how to download and install SquidGuard on CentOS 7, and how to configure it for web filtering. We will also show you how to test the web filtering on different browsers and devices, and how to troubleshoot some common problems with SquidGuard.


Step 1: Install Squid Proxy Server




The first step is to install Squid proxy server on your CentOS 7 machine. Squid is a web proxy server that acts as an intermediary between web browsers and web servers. It can cache web content, improve performance, reduce bandwidth usage, and provide additional features such as web filtering.


To install Squid on CentOS 7, you can use the yum command as follows:



# yum install squid


This will install the latest version of Squid from the official CentOS repositories. You can check the version of Squid by running:



# squid -v


Next, you need to configure Squid and start the service. The main configuration file for Squid is /etc/squid/squid.conf. You can edit this file using your favorite text editor, such as vi or nano. For example:


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# vi /etc/squid/squid.conf


In this file, you need to set a few options to make Squid work properly. Here are some of the options that you need to change or add:



Option


Description


visible_hostname


This option tells Squid the name of your server. You can use any name that you like, such as squid.example.com.


acl our_networks src


This option defines an access control list (ACL) that specifies which networks or IP addresses are allowed to use Squid. For example, if your internal network is 192.168.0.0/16, you can use acl our_networks src 192.168.0.0/16.


http_access allow our_networks This option allows the ACL that we defined earlier to access Squid. You can also use other options such as deny, allow all, or deny all to control the access.


http_port


This option tells Squid which port to listen on for incoming requests. The default port is 3128, but you can change it to any port that you like, such as 8080.


cache_dir


This option tells Squid where to store the cached web content. The default location is /var/spool/squid, but you can change it to any directory that you have enough disk space for. You also need to specify the size and type of the cache directory. For example, cache_dir ufs /var/spool/squid 10000 16 256 means that Squid will use the ufs type of cache directory with a size of 10 GB and 16 subdirectories with 256 files each.


After editing the configuration file, you need to save it and exit the editor. Then, you need to start the Squid service and enable it to run on boot. You can do this by running:



# systemctl start squid # systemctl enable squid


You can check the status of the Squid service by running:



# systemctl status squid


If everything is working fine, you should see something like this:



squid.service - Squid caching proxy Loaded: loaded (/usr/lib/systemd/system/squid.service; enabled; vendor preset: disabled) Active: active (running) since Wed 2021-06-21 11:30:08 UTC; 5min ago Main PID: 1234 (squid) Tasks: 4 Memory: 15.6M CGroup: /system.slice/squid.service 1234 /usr/sbin/squid -f /etc/squid/squid.conf 1235 (squid-1) -f /etc/squid/squid.conf 1236 (logfile-daemon) /var/log/squid/access.log 1237 (pinger) Jun 21 11:30:08 squid.example.com systemd[1]: Starting Squid caching proxy... Jun 21 11:30:08 squid.example.com squid[1234]: Squid Parent: will start 1 kids Jun 21 11:30:08 squid.example.com squid[1234]: Squid Parent: (squid-1) process 1235 started Jun 21 11:30:08 squid.example.com systemd[1]: Started Squid caching proxy.


Congratulations! You have successfully installed Squid proxy server on your CentOS 7 machine.


Step 2: Install SquidGuard Plugin




The next step is to install SquidGuard plugin on your CentOS 7 machine. SquidGuard is a plugin for Squid that allows you to define various access rules and filters based on blacklists, categories, keywords, time, IP addresses, and more. It is fast, flexible, and easy to use.


To install SquidGuard on CentOS 7, you can use the yum command as follows:



# yum install squidGuard


This will install the latest version of SquidGuard from the official CentOS repositories. You can check the version of SquidGuard by running:



# squidGuard -v


Next, you need to configure SquidGuard and enable the blacklist feature. The main configuration file for SquidGuard is /etc/squid/squidGuard.conf. You can edit this file using your favorite text editor, such as vi or nano. For example:



# vi /etc/squid/squidGuard.conf


In this file, you need to set a few options to make SquidGuard work properly. Here are some of the options that you need to change or add:



Option


Description


dbhome


This option tells SquidGuard where to find the blacklist database files. The default location is /var/lib/squidGuard/db, but you can change it to any directory that you have enough disk space for.


logdir


This option tells SquidGuard where to store the log files. The default location is /var/log/squidGuard, but you can change it to any directory that you have enough disk space for.


source


This option defines the source groups that can use SquidGuard. You can use various criteria to define the source groups, such as IP addresses, hostnames, domains, MAC addresses, and user names. For example, source students ip 192.168.0.0/24 means that the source group named students consists of all the IP addresses in the 192.168.0.0/24 network.


dest


This option defines the destination categories that SquidGuard can filter. You can use various criteria to define the destination categories, such as domains, URLs, expressions, and blacklists. For example, dest porn domainlist porn/domains urllist porn/urls expressionlist porn/expressions means that the destination category named porn consists of all the domains, URLs, and expressions that match the files in the


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