squidGuard is flexible and ultra fast filter, redirector and access controller plugin for squid proxy server (it works with both squid version 2.x and 3.x). It lets you define multiple access rules with different restrictions for different user groups on a squid cache. squidGuard uses squid’s standard redirector interface.
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Step #1: Install squidguard
Open a terminal and type the following command as root on the server:
# apt-get install squidguard
Step #2: Install Blacklist
The blacklists are the heart of every URL filter. Squidgurd supports both free and commercial distributions of blacklists on the net or create and use your own (or any combination of them). List of free databases:
- MESD blacklists (free).
- Shalla’s Blacklists (free for non commercial/private use).
- Urlblacklist (commercial)
Use wget command to download blacklists from shallalist.de as follows:
# cd /tmp
# wget -c http://www.shallalist.de/Downloads/shallalist.tar.gz
Sample outputs:
--2012-08-22 00:34:16-- http://www.shallalist.de/Downloads/shallalist.tar.gz Resolving www.shallalist.de... 78.47.242.85 Connecting to www.shallalist.de|78.47.242.85|:80... connected. HTTP request sent, awaiting response... 206 Partial Content Length: 9935263 (9.5M), 7448411 (7.1M) remaining [application/x-tar] Saving to: `shallalist.tar.gz' 100%[++++++++++++++============================================>] 99,35,263 475K/s in 16s 2012-08-22 00:34:33 (459 KB/s) - `shallalist.tar.gz' saved [9935263/9935263] |
Untar tar ball, enter:
# tar -zxvf shallalist.tar.gz
Sample outputs:
BL/ BL/porn/ BL/porn/domains BL/porn/urls BL/gamble/ BL/gamble/domains BL/gamble/urls BL/chat/ BL/chat/domains BL/chat/urls BL/automobile/ .... .. BL/radiotv/domains BL/radiotv/urls BL/urlshortener/ BL/urlshortener/domains BL/urlshortener/urls BL/anonvpn/ BL/anonvpn/urls BL/anonvpn/domains
In this example, install porn blacklist as follows using the cp command:
# cp -avr BL/porn/ /var/lib/squidguard/db/
Sample outputs:
`BL/porn/' -> `/var/lib/squidguard/db/porn' `BL/porn/domains' -> `/var/lib/squidguard/db/porn/domains' `BL/porn/urls' -> `/var/lib/squidguard/db/porn/urls'
Finally, create the database from text files as follows:
# cd /var/lib/squidguard/db/porn
# squidGuard -b -C domains
# squidGuard -b -C urls
Sample outputs:
Processing file and database /var/lib/squidguard/db/porn/domains
[==================================================] 100 % done
Processing file and database /var/lib/squidguard/db/porn/urls
[==================================================] 100 % done
Where,
- -b : Show on progress bar when updating the blacklists.
- -C fileName : Create new .db files from urls/domain files, which are specified in “fileName”.
Set permissions so that squid can read the files using chown command:
# chown proxy:proxy -R /var/lib/squidguard/db/
Step #3: Configure Squid 3
I’m assuming that Squid 3 is installed and configured properly. Edit /etc/squid3/squid.conf, enter:
# vi /etc/squid3/squid.conf
You need to specify the location of the executable for the URL rewriter using url_rewrite_program as follows:
url_rewrite_program /usr/bin/squidGuard |
Save and close the file.
Step #4: Configure SquidGuard
Finally edit /etc/squid/squidGuard.conf, enter:
# vi /etc/squid/squidGuard.conf
Add the following directives:
## Block adult/porn sites for school ## dest porn { domainlist porn/domains urllist porn/urls } |
Edit / update acl as follows:
acl { default { pass !porn all redirect http://192.168.1.11/blocked.html?clientaddr=%a+clientname=%n+clientident=%i+srcclass=%s+targetclass=%t+url=%u } } |
Save and close the file. Create a blocked.html on 192.168.1.11 web server:
<html> <head> <title>URL Blocked</title> </head> <body> <h1>URL Blocked</h1> <p>Access to this site / url has been blocked.</p> <p>If you think this is an error, please contact the help-desk:</p> <p>Call us - 123-456-789 (ext. 333)</p> <p>Email us - [email protected]</p> </body> </head> </html> |
Finally, reload the squid 2/3 proxy server:
# /usr/sbin/squid3 -k reconfigure
Verify that both squid and squidguard working properly, run:
# tail -f /var/log/squid3/cache.log
Sample outputs:
2012/08/22 01:23:40| Processing Configuration File: /etc/squid3/squid.conf (depth 0) 2012/08/22 01:23:40| Squid modules loaded: 0 2012/08/22 01:23:40| Adaptation support is off. 2012/08/22 01:23:40| Store logging disabled 2012/08/22 01:23:40| DNS Socket created at [::], FD 8 2012/08/22 01:23:40| DNS Socket created at 0.0.0.0, FD 9 2012/08/22 01:23:40| Adding nameserver 127.0.0.1 from /etc/resolv.conf 2012/08/22 01:23:40| helperOpenServers: Starting 5/5 'squidGuard' processes 2012/08/22 01:23:40| Accepting HTTP connections at [::]:3128, FD 30. 2012/08/22 01:23:40| HTCP Disabled. 2012/08/22 01:23:40| Loaded Icons. 2012/08/22 01:23:40| Ready to serve requests.
Step #5: Verify the configuration
Type the following command to verify that squidguard is working and blocking the urls:
echo "http://DOMAIN-NAME-HERE / - - GET" | squidGuard -d echo "http://sex.com / - - GET" | squidGuard -d |
Sample outputs:
2012-08-22 01:26:05 [3365] New setting: dbhome: /var/lib/squidguard/db
2012-08-22 01:26:05 [3365] New setting: logdir: /var/log/squid3
2012-08-22 01:26:05 [3365] destblock good missing active content, set inactive
2012-08-22 01:26:05 [3365] destblock local missing active content, set inactive
2012-08-22 01:26:05 [3365] init domainlist /var/lib/squidguard/db/porn/domains
2012-08-22 01:26:05 [3365] loading dbfile /var/lib/squidguard/db/porn/domains.db
2012-08-22 01:26:05 [3365] init urllist /var/lib/squidguard/db/porn/urls
2012-08-22 01:26:05 [3365] loading dbfile /var/lib/squidguard/db/porn/urls.db
2012-08-22 01:26:05 [3365] squidGuard 1.4 started (1345578965.473)
2012-08-22 01:26:05 [3365] Info: recalculating alarm in 23635 seconds
2012-08-22 01:26:05 [3365] squidGuard ready for requests (1345578965.476)
2012-08-22 01:26:05 [3365] source not found
2012-08-22 01:26:05 [3365] no ACL matching source, using default
http://192.168.1.11/blocked.html?clientaddr=+clientname=+clientident=+srcclass=default+targetclass=porn+url=http://sex.com /- - -
2012-08-22 01:26:05 [3365] squidGuard stopped (1345578965.477)
Or you can see the following in browser:
How do I block other categories?
Update /etc/squid/squidGuard.conf as follows. Define your categories. Just like you did above for porn:
dest gamble { domainlist gamble/domains urllist gamble/urls } dest alcohol { domainlist alcohol/domains urllist alcohol/urls } |
Update acl entry as follows:
acl { default { pass !porn !gamble !alcohol all redirect http://192.168.1.11/blocked.html?clientaddr=%a+clientname=%n+clientident=%i+srcclass=%s+targetclass=%t+url=%u } } |
You also need to install database in /var/lib/squidguard/db/ directory:
# cd /tmp
# cp -avr BL/alcohol/ /var/lib/squidguard/db/
# cp -avr BL/gamble/ /var/lib/squidguard/db/
To initializing the blacklists, run:
# squidGuard -C all
Or just initializing newly created categories:
# squidGuard -C /var/lib/squidguard/db/alcohol/domains
squidGuard -C /var/lib/squidguard/db/alcohol/urls
Finally, set permissions:
# chown proxy:proxy -R /var/lib/squidguard/db/
Reload the squid 3:
# /usr/sbin/squid3 -k reconfigure
Do not allow URL filter bypass by the IP addresses
To make sure that users don’t bypass the URL filter by simply using the IP addresses instead of the FQDNs, edit acl entry as follows with !in-addr directive:
acl { default { pass !porn !gamble !alcohol !in-addr all redirect http://192.168.1.11/blocked.html?clientaddr=%a+clientname=%n+clientident=%i+srcclass=%s+targetclass=%t+url=%u } } |
Reload the squid as follows:
# /usr/sbin/squid3 -k reconfigure
References:
- man pages – squid(1),squidGuard(1)
- For more information see squidguard website.
33 comment
Does it block ultrasurf? How do i blok unwanted or timely block certain http.sites..or httpa site?
Very good tutorial. Thank you very much!
Seems really useful to me!
Is it possible to block https websites?
I don’t think squidguard capable to blocking https website,but you could consider using iptables as an alternative
you should block from squid.conf
Look for
acl Safe_ports port 443 # https
and comment the line, then reload squid.
Can you put the server inline (between the router and cable modem) to filter the URL of the all PC’s behind the router?
Thanks.
Yes, just put squid proxy in transparent mode and users won’t notice it at all.
hi,
i was just confused, i did everything as show here, but the main problem is that all sites are getting blocked?
i m not sure, maybe i lacked somewhere in the configuration?
need some help pls…Thanks
GREAT!!! WORKING FINE!!!!!
Very good tutorial. Thank you very much!
Yes, we block the porn sites. Is it possible to block particular URL- facebook.com ??
Lovely tutorial but my squid will not start if I add “url_rewrite_program /usr/bin/squidGuard” to my squid.conf
If I do a test with “echo “http://sex.com / – – GET” | squidGuard -d” it works perfectly…
What is wrong?
Attention Pitto.
You have to check our squidGuard.conf file
sudo vi /etc/squid/squidGuard.conf
I do not understand the line:
Save and close the file. Create a blocked.html on 192.168.1.11 web server:
what web server? I made the blocked.html file but where do I put it?
Hello,
I am also confused about this line:
Create a blocked.html on 192.168.1.11 web server:
what is the location to save this file?
@ Andrew / sanny,
You need to install Apache2 and put file in /var/www/ directory.
HTH
Enter the IP address of your new Proxy server
what does this mean?
Hello,
I’ve put together a little script that will update that blacklists. Basically it will download, extract, move the files into place, rebuild the squidGuard databases, and reload the squidGuard processes. Will also send email notifying of success or failure.
With minor modifications it should work on any system. Tested on Ubuntu 10.04 with distro squid3, and squidGuard 1.6 compiled from squidguard.org.
Feel free to download at hopefully it will be of use to someone.
Dear Tutor,
Please help us in blocking facebook with https://facebook.com. I have tried it using Squid on CentOS and DansGuardian for url filtering. But all in vain because users are successful in wasting their time by using fb all day long.
Please provide UNIX based perfect and industry standard solution to block specifically fb with HTTPS.
Best Regards,
SAMEE ULLAH
Virtual University of Pakistan
Hi,
I tried to follow through with the tutorial, but the thing is, I’m new and a novice, so I will just describe my situation and you guys should help me through it pls.
I have a simple network with about 20 users, A Cisco 1940 Series router with IOS 15.01, which is connected to the ISP modem on port g0/1.
The router’s g0/0 interface is connected to a switch where all the hosts are connected. the Router’s g0/0 interface is 10.10.10.1, cos I’m using a network 10.10.10.0/24.
I also have a Linux Server with Ubuntu 12.04LTS installed which will act my my Transparent Proxy server to block all unwanted websites (facebook, politics, porn, https) and manage bandwidth, I have installed Squid on the Linux Server. The Linux server IP is 10.10.10.3
Can anyone please help me with the configuration (on squid, linux and router) required to achieve this?
Helps.
please let me know is there have any possibilities to unblock sites by domain names using wiildcard *.ph
Having error i this part sir. What seems to be the error? I already chown to proxy:proxy
Finally, create the database from text files as follows:
# cd /var/lib/squidguard/db/porn
# squidGuard -b -C domains
# squidGuard -b -C urls
Having error i this part sir. What seems to be the error? I already chown to proxy:proxy.
Finally, create the database from text files as follows:
# cd /var/lib/squidguard/db/porn
# squidGuard -b -C domains
# squidGuard -b -C urls
Nothing happens when I typed these commands.
Please provide UNIX based perfect and industry standard solution to block specifically facebook with HTTPS
Squidguard works fine with the echo command but
Squidguard is not blocking via browser
is there any process to unblock the proxy site…
Only works witch echo blocking websites but is not working via broser, what can i do?
The echo command works fine, howerver when I try through a web browser it fails
Through echo
2015-04-22 15:24:50 [3339] INFO: squidGuard ready for requests (1429712690.990)
2015-04-22 15:24:50 [3339] source not found
2015-04-22 15:24:50 [3339] no ACL matching source, using default
http//10.0.0.2/blocked.html?clientaddr=-+clientname=+clientident=+srcclass=default+targetclass=ads+url=http://addispenser.com/ -/- – GET
2015-04-22 15:24:50 [3339] INFO: squidGuard stopped (1429712690.990)
Through browser (line from /var/log/squid3/cache.log)
2015/04/22 15:25:17| ERROR: URL-rewrite produces invalid request: GET http//10.0.0.2/blocked.html?clientaddr=10.0.0.100+clientname=+clientident=+srcclass=default+targetclass=ads+url=http://addispenser.com/ HTTP1.1
squidGuard -b -C domains command not working. Says unable to do and booting in emergency mode
Please help me
hey ,
After copy porn folder to “/var/lib/squidguard/db/”
and “cd porn/”
then “squidguard -b -C domains”
when I add this it gives an error,says that “squidguard: command not found”.How to correct that?Give some help.
My mistake,
command “squidguard” typo error.it must be “squidGuard”
Hi,
Found this link by chance. Is this still valid today or is there a better service?
Thanks,
Ricardo
Hello,I was stuck on step #2 at
# cd /var/lib/squidguard/db/porn
# squidGuard -b -C domains
# squidGuard -b -C urls
i go to the directory with the first command, i run either the first or the second command and after pressing enter, the following message comes out:
“BDB1565 DB->put: method not permitted before handle’s open method”
if i continue with the following steps,squidguard goes to emergency mode..So,any help please?
Hello,
I have an issue while i try to compile the backlist with
# sudo squidGuard -C all
Nothing happens…
I’ve tested it with just 2 or 3 domians and it works fine but with Shalla’s Blacklist it does nothing.