Squid Deny Users Accessing a Website

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How do I deny a user accessing particular website? For example deny access to a website called foo.com.

Squid cache is a popular open source web proxy server and web cache software.

It has a wide variety of uses, from speeding up a web server by caching repeated requests, to caching web, DNS and other network lookups for a group of people sharing network resources, to aiding security by filtering traffic.

Squid has powerful ACL (access control list). The primary use of the acl system is to implement simple access control.

How to deny a user from accessing particular site?

To block site called foo.com you need to add following two lines to your squid configuration file.
# vi /etc/squid/squid.conf

Search for `Access Controls’ and append following two lines:
acl blocksites dstdomain .foo.com
http_access deny blocksites

Save and close the file. Restart Squid:
# /etc/init.d/squid restart

Let us say you would like to deny access for anyone who browses to a URL with the word “bar” in it. Append following ACL:
acl blockregexurl url_regex -i bar
http_access deny blockregexurl

Save and close the file.

Posted by: Vivek Gite

The author is the creator of nixCraft and a seasoned sysadmin, DevOps engineer, and a trainer for the Linux operating system/Unix shell scripting. Get the latest tutorials on SysAdmin, Linux/Unix and open source topics via RSS/XML feed or weekly email newsletter.

27 comment

  1. it’s out of subject! but related to SQuid.

    I need to know what is the best filesystem compatilbe with storeio? to get the best perfomance ever…

    one more questions about refresh_pattern anyone explain more to me about it…

    any help would be highly appreciated

    this squid is for caching onlu purpose and I’m looking to fine-tune it to get the best caching server ever.. thank you

  2. If you would like to experiment on Squid, the best file storage system for Squid would be COSS in my opinion. I am currently using ufs, aufs, diskd and coss in my squid servers. You have to compile Squid with the following options to enable all the storage systems: –enable-storeio=coss,ufs diskd null aufs

    Please see the great Squid FAQ at: http://wiki.squid-cache.org/SquidFaq/

    The default refresh-pattern should be good enough for almost any system:

    refresh_pattern ^ftp: 1440 20% 10080
    refresh_pattern ^gopher: 1440 0% 1440
    refresh_pattern . 0 20% 4320

    However if your needs are very specific, please see the default squid.conf for further details.

    Have a nice day !!

  3. hi,
    i setup squid on a win2003 server os.fine i got it working but my challenge now is getting it to do web filtering to restrict access to certain sites. my research on this brought me to this site and i have tried the methods described here with no success.pls can any one help me out with this? u could send ur reply to my email: uwa45@yahoo.com. if neccessary a squid conf file wld be appreciated so that i can cross check with what i did.
    Thanks for all ur help and support.

  4. hi,
    I setup the squid in linux intigration of windows. we are useing more then 20 users every thinking is working fine, but i think due to trafic squid is working only a day after it is dead. i want to improve the stability (mean i want to do fine fuining)

    and i what restrict the users while attching file size to 1M maximem.

    pls do the needful

  7. I have setup the transperant squid proxy to block some downloading & some urls.
    How to block or deny the online listening musics & videows. Like for url youtube.com

    Any Idea.

    Cheers,
    Nandkihosr

  9. Hi all,
    I using squid as firewall. I want to block teamviewer which uses port 80 i guess.but i have to keep the 80 port open for browsing purpose. i am not that good at linux.
    Can any one please help.

    Thanks in advance
    Jonayed
    bangladesh

  10. Hi Vivek,
    I have configure squid in my office using your earlier artical of making transperent proxy. I want to block some site, for that I have use this artical but its not working. Please help.

    Vijay

  11. Hi friend,
    Can u help me to “cache a particular website and store it in local system and if the client user send a request for that particular site, the proxy first check it in local cache,if not available means pass the request to internet” this is my requirement how to configure this by using squid proxy.

  12. dear
    sir
    please solved my problem
    thirty pc’s in a room i have installed redhat linux 5 but i want to make a pc’s server
    and i need that i am blocking some sites which not shown front web page which we want to block
    any sites.
    and i have a broadband connection and i want that with my computer’s ip address can be supplied
    which we want to result is that my internet and my local area connection both are working together and
    i no need for obtain my ip addresses

  13. To block teamviewer you can add something like this to your squid config:

    acl teamviewer url_regex din\.aspx$ dout\.aspx$
    http_access deny teamviewer

  15. I need to setup so that I can have certain machines blocked from some websites and certain machine allowed to access. For example
    machine 1 can access msnbc.com
    machine 2 can not access msnbc.com

    Can you advise what the easiest way to set this up is?

    Thanks

  16. i tried to block for a specific site and i get that working. but is there a means to block based on source address and destination ipaddress or domain name just in one acl definition?. this kind of acl is very common in Cisco routers.
    for eg. i want to deny a web traffic that originates from a specific ip address and its destination address is say http://www.google.com.
    can any body tell me how to proceede?
    Thanks

  17. by default youtube.com is blocked in Dansguardian, how can i allow youtube.com to be accessed in Squid Guard?

    cheers

  19. Hi

    i need to release the website block for the holidays.

    So how can i define a specific day from squid proxy conf.

    thanks in advance
    kosala

    1. On method is to create a cron job. You can have cron jobs to append to the .conf file or simply backup and replace it.

  20. Hi,
    Does anyone knows how to block proxy browsing (anonymous Browsing via squid proxy server) ???

  22. hi,
    Can someone help me here? I was trying to block some website using squid, it works… it blocked the sites i listed to be blocked, but it also blocked a system we are using it open the web site but the system does not work, it uses java.

  23. Can someone help me in blocking miniclip.com games sites. I tried different ways and none was working. Still users are able to access the site.

    Please help me with this.

    1. You can use netbios name of that user’s computer and block sites

      here is a sample config

      === squid.conf ===
      acl BLOCK_USER_FROM_NETBIOS srcdomain “/etc/squid/BLOCK_USER_FROM_NETBIOS”
      acl BLOCKED_URLS_FOR_SPECIFIC_USER dstdomain “/etc/squid/BLOCKED_URLS”
      http_access deny BLOCKED_URLS_FOR_SPECIFIC_USER BLOCK_USER_FROM_NETBIOS
      =================
      Create a file : BLOCK_USER_FROM_NETBIOS in /etc/squid/ ( I suppose your squid configuration directory is /etc/squid)
      add your user’s computer name there. as an example, lets say computer name is “deepak” and your local domain name is “example.org” suppose your computer is a domain member of example.org. so the netbios name will be “deepak.example.org” , add that to your BLOCK_USER_FROM_NETBIOS file.

      after that create a file /etc/squid/BLOCKED_URLS
      and add urls you need to block. suppose you need to block facebook.com, add a line like this .facebook.com

      reload your configurations
      #squid -k reconfigure
      or restart the service.

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