Intended for qemu-discuss
/cc/ libvir-list, whonix-devel, tor-dev
***
Hello. I work on WhonixOS an anonymity distro based on Tor. This feature
request is related to the topics of privacy and anonymity. Its a complex
topic and probably not in your area of focus but I think it has
important implications because security and privacy are very much
related in today's hostile computing environment.
Virtualization is useful in presenting an identical environment and set
of "hardware" for each user which goes a long way in creating an
anonymity set of systems. That way a system attacker, advertisers and
online trackers would not be able to fingerprint a user or their
hardware.
The problem: Tracking techniques have become more sophisticated with
time. They advanced from simple cookies to browser/device fingerprinting
(which Tor Browser focuses on defeating) to user behavior
fingerprinting. The latter is about profiling how a user types on a
keyboard or uses a mouse [2].
Keystroke dynamics is a super creepy way to track users based on how
long they press keys (dwell time) and the time between key presses (gap
time). This is extremely accurate at identifying individuals because of
how unique these measurements are. Advertising networks (Google,
Facebook...) that fingeprprint users on both the clearnet and Tor can
deanonymize users. This technique is already actively used in the wild
[6][7].
Potential Solutions:
Since input devices are all emulated its a great opportunity to stop
this profiling technique.
* A security researcher designed a proof of concept plugin for Chrome
browser that mitigates this. Implementing something like the PoC addon
in [1] known as KeyBoardPrivacy. Some random delay in milliseconds in a
50 millisecond range for dwell and gap times for the emulated keyboards
is enough to skew the values to render this attack useless while not
affecting performance.
* The changes made to Tor Borwser to make JS timers more coarse grained
but constant (250ms for keyboard events) were not enough to stop
keystroke dynamics fingerprinting because a malicious script can evict
the cache and allow extrapolation of true timing events within 1-5ms
accuracy .[3][5] Their goal is to instead add jitter to the timers [4].
A similar solution proposed in [4] can be implemented in all QEMU-KVM
timers to mitigate both attacks.
[1]
https://paul.reviews/behavioral-profiling-the-password-you-cant-change/
[2]
http://jcarlosnorte.com/security/2016/03/06/advanced-tor-browser-fingerprinting.html
[3]
https://www.lightbluetouchpaper.org/2015/07/30/double-bill-password-hashing-competition-keyboardprivacy/#comment-1288166
[4] https://trac.torproject.org/projects/tor/ticket/16110
[5] https://trac.torproject.org/projects/tor/ticket/1517
[6] http://scraping.pro/no-captcha-recaptcha-challenge/
[7]
https://nakedsecurity.sophos.com/2013/11/01/facebook-to-silent-track-users-cursor-movements-to-see-which-ads-we-like-best/
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