Category: Internet Security

Jan 03

Protect your Anonymity online with Vadalia, Privoxy and Proxychains

Happy New Year.  You will be monitored.  We are watching you.  We know who you are.  We know where you are.

The following is a concise guide to configuring Internet Anonymity on Linux by leveraging the tor network (vidalia) and a local proxy server (privoxy) then running your web browser using proxychains.

I have tried the tor browser bundle but couldn’t access most of my websites so found it to be pretty useless in everyday life.  This however, lets me access all my sites fine (so far), so provides protective anonymity without getting in the way.

I have found certain sites like Google sometimes use captcha to prove you’re a human but it’s no big deal.  It is a response that is more likely to be coming from OpenDNS rather than Google actually.

Disclaimer:  The following should be used for educational purposes only and not to facilitate any illegal online activity.

This is a compliment to your firewall.  It should remain ON.  You can further harden your web browser by “jailing” it to prevent penetration by following this guide here.

Remember:  Todays paranoia is tomorrows security standard.

TEST
firefox www.dnsleaktest.com www.whatismyip.com
You should see your IP address and location.

This information is logged along with the sites you visit and held by your ISP in line with new regulations.  Everything they need to lead them right to your door.  FTS.

PACKAGES TO INSTALL
sudo apt-get install privoxy vidalia proxychains

PRIVOXY – local privacy proxy server runs on 127.0.0.1:8118
vi /etc/privoxy/config, search for localhost:8118 and replace with 127.0.0.1:8118

VIDALIA – tor front-end. set up relaying to use local privoxy proxy (enter privoxy settings above) then add vidalia to Session & Startup apps list.

  Note that the green Tor onion may take a little while to go green after your computer initially connects to the network/wifi.

DNS SERVICES – change your network/wifi IPv4 settings
Use OpenDNS addresses 208.67.222.222 208.67.220.220

PROXYCHAINS
ProxyChains allows to run any program through HTTP or SOCKS proxy.
This tool tunnels all TCP and DNS connections of given applications.

Note: precede launcher command of application with proxychains, i.e. proxychains firefox %u

vi /etc/proxychains.conf
comment out strict_chain
uncomment dynamic_chain
add these lines under [ProxyList] section
socks4 127.0.0.1 9050
socks4a 127.0.0.1 9050
socks5 127.0.0.1 9050
http 127.0.0.1 8118

TEST
proxychains firefox www.dnsleaktest.com www.whatismyip.com
You should see that you now appear to be in a foreign country, not your actual geographical location.

Download the latest Linux .iso file to create some bandwidth and view the bandwidth graph in vidalia.

That’s it.  You’re Anonymous!

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Nov 07

Protect your Linux system by jailing your web browser

Your Linux system is inherently less vulnerable to attack than Microsoft Windows for a number of reasons.

  1. You’re less of a target to virus attack by being in the minority (Only 2.18% of people run Linux as their desktop operating system with most of those running a Debian derivative, the most popular being Linux Mint).
  2. You execute user processes as a non-privileged user (Remote code executing in your browser is not running in the context of a local Administrator account so has much less privileges to do potentially damaging things to your computer and data).
  3. Your Linux system is built entirely from packages obtained and installed from known, trusted repositories (No dodgy software downloaded from goodness-knows-where that may or may not be what you think it is.  The code of any given package undergoes constant scrutiny and improvements by the open source community.)
  4. There’s no marketing, advertising, ransom-ware or hidden agendas lurking in the operating system or the applications that are ultimately built by the people, for the people, and distributed to the people for free (feel the love).

Despite all these advantages, we live in the (dis)information age, and that means that the way to reach your users is through their web browsers.  So this next part should interest you.

…we live in the disinformation age, and that means the way to reach you is through your web browser.  So this next part should interest you.

How do I protect my web browser? (Firefox is the default web browser on Linux Mint -my OS and browser of choice)

firewall

  1. Enable the firewall (above)
  2. Once a new installation of Linux Mint is complete, I reboot, log on, Install all pending updates by typing sudo apt-get update && sudo apt-get dist-upgrade in a terminal window.
  3. Connect to my WiFi network, open Firefox and install the AdBlock Plus and uBlock Origin plugins.

And that’s it.  Or at least it has been until now, and in fairness it’s kept me safe since 2005.  I’ve never installed anti-virus software and never had a problem in over a decade.  AV products on Linux such as clam are usually for the benefit of Windows users on the same network or mail attachment scanning on Linux mail servers, neither of which is applicable in my home network environment.

Today though, I learned about something else.  The existence of firejail, -a program that “jails” certain other programs, and I really like what I see.

Like most Linux programs, it’s super quick to install with a quick sudo apt-get install firejail command in a terminal window and as easy to “use”.  In firejail’s case, you just edit the shortcuts of your existing launchers and pre-pend the command firejail

e.g. firefox %u becomes firejail firefox %u

firejail

By jailing the firefox process, it prevents the web browser from being able to access your system, quite literally.  Kind of like a firewall for processes rather than TCP/UDP ports, that only allows certain interactions with the rest of the operating system through.

For example, look what happens when trying to upload a picture I’ve saved to my Desktop to this very blog post…

desktop

The Desktop looks empty.  Nothing.  Blank.  No files or subfolders.  Yet my Desktop folder contains loads of images and other files and subfolders, as does my Pictures folder – same again, blank.  This is because firefox is jailed.  It can’t get out and into your filesystem.  Brilliant – and only a little inconvenient as it can still access my Downloads folder.  So if I want to upload a file, I just have a make a copy into my Downloads folder first using my File manager caja (which isn’t jailed).  Uploading to my Dropbox account using the web based interface would be a bit of a pain, but the Dropbox daemon running on my computer does all my file syncing anyway, so it doesn’t present a problem.  I don’t actually need to use Dropbox’ web interface.

This all works in accordance with the application profile in /etc/firejail/firefox.profile -there’s loads of them, not just for firefox but other internet/vulnerable programs like filezilla, transmission etc too.

Filezilla’s firejail profile on the other hand seems to be a lot more lenient and allows access to your home directory where you might wish to upload an entire folder structure to your web server.  You could always edit the filezilla.profile to harden it yourself I guess.

Whilst I found firejail in my repositories, I didn’t find the accompanying firetools package – a simple launcher that sits on your desktop.  It’s not really needed if you’ve edited your launchers to your favourite apps already and just allows you to add some additional programs to it and shows any running jailed processes if you’re interested in seeing that.  It places a convenient icon in your systray area too, for easy recall.

firetoolsfiretools-trayfiretools-processes

 

 

 

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Dec 12

Adding a blocklist to Transmission torrent client on Linux

When using a torrent client on Windows such as utorrent, it’s not a bad idea to run peer block to protect your computer from inbound connections from a maintained list of known ip addresses.

Linux comes with a torrent client built in, usually Transmission, although Deluge is a bit more like utorrent, i.e. shows more info on the screen, has a few more options etc.  Transmission works perfectly well though and ticks the minimalist box if that’s your thing.  Both are available via the repositories using the built in package manager.

Peer Block isnt available for Linux.  Transmission however, supports the use of blocklists, so increasing your level of protection has actually never been simpler.

In Preferences, just add the following url to the Blocklist field and click Update.  Done.

http://list.iblocklist.com/?list=bt_level1&fileformat=p2p&archiveformat=gz

transmission

To provide system-wide protection, you should install ufw from the package manager.

  gufw is a GUI that can be used to enable ufw and configure rules.

ufw is installed by default in Linux Mint but is not turned on.

firewall

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