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Thread: HOWTO: Install Dansguardian on a single desktop

  1. #1
    Join Date
    Jun 2006
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    HOWTO: Install Dansguardian on a single desktop AND for a network

    Dansguardian does an outstanding job of web content filtering to protect from rubbish on the internet. This howto is a synthesis of information taken from:
    http://www.pilpi.net/journal/item-985.php

    ** Edit ** 25th November 2009 Please see final pages of this thread (Pages 13-14) for adaptions/updates to this howto for Ubuntu 9.10 (Karmic) and in particular issues with Karmic version of Dansguardian. Also a deb that is available to automate much of this.

    Setting up Dansguardian using Tinyproxy and Firehol on Ubuntu/Edubuntu

    1. Ensure "universe repository" is activated and install packages:
    sudo apt-get update
    sudo apt-get install dansguardian tinyproxy firehol


    Note: will probably need to reinstall dansguardian to overcome clamav config errors.

    2. Edit: sudo gedit /etc/dansguardian/dansguardian.conf

    a) Add comment (#) to:
    #UNCONFIGURED

    b) Turn off virus checking (if not wanted):
    virusscan=off

    c) Check that the following are set:
    filterport = 8080
    proxyip = 127.0.0.1
    proxyport = 3128


    d) Save & exit.

    e) Run:
    sudo dpkg-reconfigure dansguardian

    3. Edit: sudo gedit /etc/firehol/firehol.conf

    Add all of the following at the start of the document:

    iptables -t filter -I OUTPUT -d 127.0.0.1 -p tcp --dport 3128 -m owner ! --uid-owner dansguardian -j DROP

    transparent_squid 8080 "root root"

    interface any world
    policy drop
    protection strong
    client all accept
    server cups accept
    #server webcache accept


    Note: will need to remove "interface any world . . ." further on in the document.
    Note: uncomment "server webcache accept" if this dansguardian system is going to filter others on a network BUT do not then connect directly to the internet as this is opening it wide open for anyone to access!

    4. Edit: sudo gedit /etc/default/firehol

    START_FIREHOL=YES

    This is to allow restarting of the firewall.

    5. Edit sudo gedit /etc/tinyproxy/tinyproxy.conf

    Change/add the following lines (by scrolling through the document):
    User root
    Group root
    Port 3128
    ViaProxyName "tinyproxy"


    6. Restart each program:

    sudo /etc/init.d/tinyproxy restart
    sudo /etc/init.d/firehol restart
    sudo /etc/init.d/dansguardian restart


    7. Dansguardian should now be operational blocking objectional sites using any browser!

    ** EDITED INFORMATION ** I have edited this to include the use of these instructions for not only a single desktop but also for other systems (including Windows boxes) to point to such a configured box on a network and be filtered. This requires the addition of the last line in firehol.conf as above "server webcache accept".

    The other systems must have their proxy settings set in the browser to point to the ip address of the dansguardian system and port 8080.

    In Firefox:
    Edit -> Preferences -> General -> Connection Settings -> Manual proxy configuration

    Check manual proxy configuration and add “your DG box ip address” in first box and “8080” in second
    Then tick “Use this proxy server for all protocols”

    These settings can be locked, instructions are available below to do this:

    Modify the file sudo gedit /usr/lib/firefox/firefox.cfg (sudo gedit /usr/share/doc/firefox-3.5/firefox.cfg) - for Firefox 3.5

    by adding the following:

    lockPref("network.proxy.http", "127.0.0.1");
    lockPref("network.proxy.http_port", 8080);
    lockPref("network.proxy.type", 1);
    lockPref("network.proxy.no_proxies_on", "localhost, 127.0.0.1");

    PLEASE NOTE: The dansguardian system that is doing the filtering on your network using this configuration CANNOT be connected directly to the internet - very important!!
    Last edited by tonhou; November 24th, 2009 at 11:28 PM. Reason: Change in Dansguardian

  2. #2
    Join Date
    Feb 2006
    Location
    Kansas City, MO
    Beans
    1,106
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    Ubuntu

    Re: HOWTO: Install Dansguardian on a single desktop

    wow!! thanks for that howto!! i've been looking everywhere for that kinda thing!! you don't even need to configure the browser with the proxy or anything?

  3. #3
    Join Date
    Jul 2006
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    250
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    Ubuntu 6.10 Edgy

    Unhappy Re: HOWTO: Install Dansguardian on a single desktop

    just one problem when i follow this guide my browser can't connect but things like gaim and my email programme can connect??? anyone able to help m,e?

  4. #4
    Join Date
    Jan 2005
    Location
    Mount Morris, Michigan
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    Re: HOWTO: Install Dansguardian on a single desktop

    I am having the same problem, it seems to block everything

  5. #5
    Join Date
    Jun 2006
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    70

    Re: HOWTO: Install Dansguardian on a single desktop

    Sorry that it is not working for you guys! I'm afraid I don't really know what the issues are. It has worked for me on around 6 systems that I have set up. I have also done other enhancements - added lines to dansguardian configuration to block undesirable image searches and also locked firefox browser settings to stop use of secure proxy sites.

    Could you check that each of the three programs are running. In a terminal:

    ps auxf

    Also you may like to look at this post where there is a similar approach with some different configuration:

    http://ubuntuforums.org/showpost.php...7&postcount=21

    --Tony

  6. #6
    Join Date
    Jan 2005
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    Mount Morris, Michigan
    Beans
    176

    Re: HOWTO: Install Dansguardian on a single desktop

    I am sorry, it is actually working VERY well and now I just have to tinker with the filters.
    Thenk you for the HowTo, I have been looking for someting like this for months!

  7. #7
    Join Date
    Jun 2006
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    70

    Re: HOWTO: Install Dansguardian on a single desktop

    Glad that it is working!

    Here are some changes that I have made to filters etc. for searching images and also for stopping access to secure proxy sites.

    1. Modify the file /etc/dansguardian/bannedregexpurllist

    by uncommenting (remove #) so that it looks as it is below:

    #Block unfiltered options on various search engines
    (^|[\?+=&/])(.*\.google\..*/.*\?.*safe=off)([\?+=&/]|$)
    (^|[\?+=&/])(.*\.alltheweb.com/customize\?.*copt_offensive=off)([\?+=&/]|$)

    #Block images on altavista, alltheweb, yahoo etc - as they are anonomised
    (yahoo.com\/image\/)
    (yimg.com\/image\/)
    (altavista.com\/image\/)
    (altavista.com\/video\/)

    AND/OR modify the file /etc/dansguardian/bannedphraselist

    by adding the following:

    #-----
    # Google
    < safesearch is off >,< about google >,< Advanced&nbsp;Image&nbsp;Search>
    # Yahoo
    < safesearch is off >, < images >
    # Dogpile, Excite, Webcrawler
    < likely to contain adult content >,< results with adult content >
    # AlltheWeb
    <offensive content filter is off>,<results with offensive content>
    #-----

    These stop adult/offensive images if safe search is turned off for an image search engine.

    2. Change firefox preferences to stop use of secure proxy sites to gain access to blocked sites:

    For Firefox:

    Modify the file sudo gedit /usr/lib/firefox/firefox.cfg

    by adding the following:

    lockPref("network.proxy.http", "127.0.0.1");
    lockPref("network.proxy.http_port", 8080);
    lockPref("network.proxy.type", 1);
    lockPref("network.proxy.no_proxies_on", "localhost, 127.0.0.1");

    This will lock the proxy settings in firefox preferences if it is considered necessary to block access to secure proxy sites such as :
    https://proxify.com
    (these provide an unfiltered gateway out!)

    Please note that the firefox.cfg file is overwritten each time there is a firefox update!!
    --Tony
    Last edited by tonhou; September 23rd, 2006 at 03:27 AM.

  8. #8
    Join Date
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    Re: HOWTO: Install Dansguardian on a single desktop

    Another simple to setup filtering option if you use Firefox is to use the extension blockxxx. Unfortunately it has not been available for Firefox 1.5 but here is an updated version:

    http://cvs.linex.org/blockxxx-0.4.1-fx.xpi

    To install go to File -> Open File (and point to where blockxxx is downloaded to).
    It seems to do a reasonable job with the default lists, but needs extra blocking URL's to stop/tighten search engine changing of preferences. I have also imported a larger list of blockable words.

    --Tony

  9. #9
    Join Date
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    Re: HOWTO: Install Dansguardian on a single desktop

    I recommend the script that automatically installs dansguardian (with firehol & tinyproxy - as above) along with a smart graphical front end to change filters that has been put together by Jereme found here:

    http://www.ubuntuforums.org/showthread.php?t=237355

    --Tony

  10. #10
    Join Date
    Aug 2006
    Location
    Albany, GA
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    Distro
    Ubuntu 6.06

    Re: HOWTO: Install Dansguardian on a single desktop

    Quote Originally Posted by tonhou View Post
    I recommend the script that automatically installs dansguardian (with firehol & tinyproxy - as above) along with a smart graphical front end to change filters that has been put together by Jereme found here:

    http://www.ubuntuforums.org/showthread.php?t=237355

    --Tony
    Can you get just the gui frond end? I've followed the above howto and have dansguardian working properly, but a gui tool for configuration would be nice.

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