Cisco CCNA, Routing, Switching, Packet Tracer, Linux, Security, Photoshop, Flash, Windows Server, and Web Game Programming. Turn a Raspberry Pi into a Web Filter Proxy with Squid. Guard Overview. Most routers for the home don’t do a very good job at filtering objectionable web content. One possible solution is to turn a Raspberry Pi into a proxy web filter that can protect users on your home network.
In this lab, I turn a Raspberry Pi running the Raspbian Linux operating system into a robust web proxy that filters objectionable web sites. In order to turn the Raspberry Pi into a web proxy I install and configure Squid and Squid. Guard, and then I download and configure a blacklist file which is available for personal use through a creative commons license. This lab focuses on turning the Raspberry Pi into a standalone proxy server that can be reached by changing the network clients web browser proxy settings, or by configuring the router to direct web traffic to the proxy server. In a follow up lab, you could configure the Raspberry Pi as a transparent inline proxy server. Step- by- step instructions.
First, I recommend updating your repositories and then installing the program locate and updating the index/database of file locations. This will help you if you need search for the file paths to the Squid and Squid.
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Guard configuration files. After installing Squid and Squid. Guard you will want to run the sudo updatedb command again in order to make the newly installed files indexed and searchable with locate. Install Squid, start it, and set it to start on boot $ sudo apt- get install squid. Use netstat to check to see if Squid is listening on port 3. Squid uses is proxy: proxy for the user and group $ sudo netstat - antp . Edit the Squid configuration file and then reload Squid.
Notice, that I run updatedb and then use locate to find the location of the squid. S sudo locate squid. Now that Squid is running you can test it from another computer on the network by going to another computer and changing the settings in Firefox or Chrome to point to the Squid web proxy on the Raspberry Pi. Open Firefox and go to File > Options > advanced > network tab > connection settings > manual proxy configurationand set it to: < the ip address of the computer/RPi running squid> :3. Note: In order to test the Squid proxy server from another computer you will need to make sure that the proxy server’s firewall is not blocking outside requests. Depending on your distribution the Linux firewalld or iptables firewall can be actively blocking outside requests. You will need to add a rule to allow requests on port 3.
On the Raspbian operating system by default there should be no firewall activated, but just in case, you can turn off the iptables firewall using the following command: $ sudo service iptables stop. You can monitor the access log to see it working$ sudo tail - f /var/log/squid.
Now browse the web in Firefox, or the web browser of your choice to see if you are able to receive webpages through the Squid proxy. If you are able to successfully reach websites, then the Squid proxy is working correctly and allowing web requests. Look to the output of Squid’s access. Squid (issue the tail command shown above)5. With Squid working you can now install Squid. Guard$ sudo apt- get install squid.
Guard. 6. Now that Squid. Guard is installed, you will want to download a blacklist of websites and domains that you can block with Squid. Guard. You can find more information at http: //squidguard. Squid. Guard and where to find blacklists. A great resource is located at http: //dsi. The website http: //www.
You will find links to other commercial blacklist sites as well. For this lab, I recommend downloading the shallalist.
You can download it from the command line using wget or from the gui using a webbrowser. Download the blacklist file to your Downloads or home folder but before you install a full blacklist let’s create a testdomain file with test domains for Squid. Guard to practice blocking$ cd /var/lib/squidguard/db$ sudo nano testdomainstype in three lines of text to add some test- domains to block: yahoo. Now edit the squid.
Guard. conf file to configure it to work with the testdomains file. You may want to back up the squid. Guard. conf file before making changes. Be careful in your edits, incorrect syntax will cause squid. Guard to fail. The beginning of the text file has been omitted.#dest adult . Now install the Apache. Blocked!< /title> < /head> < body> < h.
You have been blocked by Raspberry Pi administrator!< /h. Save and exit. 9. Now you need to compile the Squid. Guard blacklists.
Now give Squid. 3 ownership or access to some of the squidguard files and directories: $ sudo chown - R proxy: proxy /var/lib/squidguard/db$ sudo chown - R proxy: proxy /var/log/squidguard$ sudo chown - R proxy: proxy /usr/bin/squid. Guard. 11. Edit the squid. Squid$ sudo nano - c /etc/squid. Add the following line to the squid.
Now open the Firefox browser from another computer and test to see if the domains listed in the testdomains file in step 6 are successfully blocked. Domains not listed in the testdomains file should be allowed. In other words, from another computer with the web browser configured with the proxy settings of the Raspberry Pi’s ip address and port number 3. If you were successful at blocking the testdomains then it’s time to extract and decompress the shallalist.
Step 6. When you extract shallalist. BL. You will then copy BL to the squidguard db folder$ cd ~/Downloads$ tar - xzf shallalist. BL - R /var/lib/squidguard/db$ cd /var/lib/squidguard/db. Now recursively change permissions on the BL blacklists folder so you can list through the various blacklist categories that you may wish to activate. You will need to know the name paths of the categories, folders and files that you will want to compile to work with Squid. Guard$ sudo chmod - R 7.
BL$ sudo chown - R proxy: proxy /var/lib/squidguard/db/BL$ ls /var/lib/squidguard/db/BL1. Now you can edit the squid. Guard. conf file to configure it to begin blocking undesirable content$ sudo nano - c /etc/squidguard/squid. Guard. conf. In the config file, change the following lines in red. Be careful in your edits, incorrect syntax will cause squid. Guard to fail. You will need to add a dest gamble block as well as changing the paths to the content you intend to block.
Notice under dest gamble that I change the paths under domainlist and urllist to match the content and paths in the BL folder<. Now you need to recompile the Squid. Guard blacklists which will create new squid.
Guard blacklist database files. Then change ownership of the files in the db folder to proxy$ sudo squid. Guard - C all$ sudo chown - R proxy: proxy /var/lib/squidguard/db. Reload Squid and then use Firefox from another computer to test to see if Squid and Squid. Guard are blocking websites with known adult content.
You may want to execute this test privately or with the majority of the web browser dragged off screen !