I’ve recently worked on anonymizing as many of my applications as I could in that spirit.
I looked for a practical way to anonymize my Skype. Skype communication is so essential this days,
it’s very likely that a huge part of skype communication is being monitored by skype corp, it’s not impossiblethat some malicious installed trojan in skype would report about which IP address you’re using to connectto Skype.
Therefore proxifying skype could be a step further to at least prevent for following your skype traffic route.
Of course passing Skype traffic via tor is not a guarantee for anonimity since it’s probably very easy for Skypeowner company to keep record of Skype users, where do they people originate from, full log of people comminicationvia skype based on their user login.
As skype is a closed software and we have no access neither to the protocol specs neither to program source code, it’s almostimpossible to know if communication via skype is secure in sense of privacy.
It appeared that proxifying skype is a piece of cake and comes just to a proper instalating of Tor + polipo caching proxy and further installing proxychains
Proxychains is a rather interesting software, it’s able to carry any application TCP and DNS traffic through a proxy server (http and socks).
Therefore proxychains is able to run any program through proxy server and hence hide your real IP.
Interesting fact is that proxychains is the Unix equivalent for Window’s Freecap – “Program based on universal DLL injection in alien process (works on all Windows from Win95 to Longhorn), which hooks Winsock API, redirecting connect requests to the SOCKS server.
So if you intend to proxify your Skype application on a Windows host you will have to use Wincap.
Back to the main topic of “what is the way to proxify” skype on Linux, so here is how I did it:
1. Install proxychains (available on a Debian host directly as a deb package)
debian:~# apt-get install proxychains
2. Install skype from source on Debian Testing/Unstable (Lenny / Squeeze / Sid). I personally use skype_static-184.108.40.206.tar.bz2
debian:~# cd /root
debian:/root# wget http://www.pc-freak.net/files/skype_static-220.127.116.11.tar.bz2
debian:/root# tar -jxvf skype_static-18.104.22.168.tar.bz2
debian:/root# mkdir /opt/Skype/
debian:/root# mv skype_static-22.214.171.124 /opt/Skype/
Also place a skype startup script to instruct skype that it will have to use the pulseaudio for a sound server.
Crete the /usr/local/bin/skype file.
It should contain the following
/usr/bin/proxychains /usr/bin/linux32 /opt/Skype/skype_static-126.96.36.199/skype
#/usr/bin/torify /usr/bin/linux32 /opt/Skype/skype_static-188.8.131.52/skype
Now simply startup skype by either typing /usr/local/bin/skype from a terminal or either create a shortcut towards skypeor edit the existing shortcut added in either GNOME or KDE menus and set it to use /usr/local/bin/skype as a skype starter.
Even better proxychains can be used to proxify via a tsocks proxy any other application on your BSD or Linux.
I’ve also noticed that tor deb is also equipped with a program called torify – torify – wrapper for tsocks and tor
I’m not quite sure if torify is also able to torify skype along with the other applications for which it can be used to torify traffic, so if any of the readers of this article can give some feedback if they have tried that would be really nice 🙂