This repository houses the next generation of FaceDancer software. Descended from the original GoodFET-based FaceDancer, this repository provides a python module that provides expanded FaceDancer support-- including support for multiple boards and some pretty significant new features.

FaceDancer boards are simple hardware devices that act as "remote-controlled" USB controllers. With the proper software, you can use these boards to quickly and easily emulate USB devices-- and to fuzz USB host controllers!

This particular software repository currently allows you to easily create emulations of USB devices in Python. Control is fine-grained enough that you can cause all kinds of USB misbehaviors. :)

For more information, see:

• Travis Goodspeed's blog post on FaceDancer
• The FaceDancer 21, the original supported board

A major new feature of the newer FaceDancer codebase is the ability to man-in-the middle USB connections-- replacing one of the authors' original USBProxy project. This opens up a whole new realm of applications-- including protocol analysis and live manipulation of USB packets-- and is especially useful when you don't control the software running on the target device (e.g. on embedded systems or games consoles).

                 +-----------------------------------------------------------------------+
+------------+   |  +--------------------------------+   +---------------------------+   |  +--------------+
|            |   |  |                                |   |                           |   |  |              |
|  PROXIED   |   |  |         HOST COMPUTER          |   |    FACEDANCER DEVICE      |   |  |  TARGET USB  |
|   DEVICE   <------>  running FaceDancer software   <--->  acts as USB-Controlled   <------>     HOST     |
|            |   |  |                                |   |      USB Controller       |   |  |              |
|            |   |  |                                |   |                           |   |  |              |
+------------+   |  +--------------------------------+   +---------------------------+   |  +--------------+
                 |                                                                       |
                 |                    MITM Setup (HOST + FACEDANCER)                     |
                 +-----------------------------------------------------------------------+

This feature is complete, but could use more documentation. Pull requests are welcome. :)

First, you'll likely want to set the BACKEND environment variable, which lets the software know which type of FaceDancer board you'd like to use. If this variable isn't set, the software will try to guess for you based on what's connected. It doesn't always make the best guesses, so you're probably better off setting it yourself.

Next, you can run any of the pre-made scripts, e.g. facedancer-serial.py.

For example:

export BACKEND=goodfet
./facedancer-serial.py

• All GoodFET-based facedancers, including the common FaceDancer21 (BACKEND=goodfet)
• The GreatFET One (BACKEND=greatfet)
• The NXP LPC4330 Xplorer board (BACKEND=greatfet)
• The CCCamp 2015 rad1o badge with GreatFET l0adable (BACKEND=greatfet)
• RPi + Max3241 Raspdancer boards (BACKEND=raspdancer)

Note that hardware restrictions prevent the MAX3420/MAX3421 boards from emulating more complex devices-- there's limitation on the number/type of endpoints that can be set up. The LPC4330 boards-- such as the GreatFET-- don't suffer these limitations.

For a similar reason, the MAX3420/MAX3421 boards (BACKEND=goodfet or BACKEND=raspdancer) currently cannot be used as USBProxy-nv MITM devices. All modern boards (BACKEND=greatfet) should be fully functional.

• Any Linux computer with gadgetfs support (e.g. the Pi Zero or Beaglebone Black)

The roadmap is hazy, but in addition to multi-board support, this repository eventually will be home to some cool new features, such as:

• High-speed ("USB 2.0") device emulation on devices with USB 2.0 PHYS

There are a lot of people to blame for the awesomeness that is this repo, including:

• Travis Goodspeed (@travisgoodspeed)
• Sergey Bratus (@sergeybratus)
• ktemkin (@ktemkin)
• Dominic Spill (@dominicgs)
• Michael Ossmann (@michaelossmann)
• anyone whose name appears in the git history :)

... are always welcome. Shoot us a PR!