Difference between revisions of "Facedancer"

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==Raspdancer==
  
==Raspdancer==
 
Merging Facedancer & Raspberry Pi
  
Merging Facedancer & Raspberry Pi
  +
<br>See dedicated page: [[Raspdancer]]
−
===Why?===
  
−
Facedancer11 is a one-purpose version of the flexible GoodFET board.
  
−
<br>It was well designed to move all the intelligence into the host controller, not in the embedded uC.
  
−
<br>Facedancer11 hardware can be seen as:
  
−
USBconn -- FT232RL -- MSP430F2618TPM -- MAX3420E -- USBconn
  
−
where the first two chips are only converting busses:
  
−
USBconn -- FT232RL -- MSP430F2618TPM -- MAX3420E -- USBconn
  
−
USB <> UART <> SPI ... (USB)
  
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BoM view (excluding taxes, Farnell prices):
  
−
USBconn -- FT232RL -- MSP430F2618TPM -- MAX3420E -- USBconn
  
−
USBconn + 5.45€ + 13.03€ + 8.27€ + USBconn
  
−
So 18.48€ to talk SPI over UART over USB while the Raspberry-Pi has natively SPI, hmmm.
  
−
<br>Bus speed view: yes there is a kind of bottleneck there...
  
−
USBconn -- FT232RL -- MSP430F2618TPM -- MAX3420E -- USBconn
  
−
12MB/s 115200bauds 26MHz
  
−
<br>Let's try to make a RPi extension board with only the MAX3420E.
  
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<br>And to save a few cents and construction pain let's replace the USB connector by a USB cable from a cannibalized mouse.
  
−
<br>So:
  
−
RPI-MODA-256M -- MAX3420E -- USBcable
  
−
From a BoM point of view this becomes (depending on what you add to the RPi, nice casing etc):
  
−
RPI-MODA-256M -- MAX3420E -- USBcable
  
−
27.66€ + 8.27€
  
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Bus speed view:
  
−
RPI-MODA-256M -- MAX3420E -- USBcable
  
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26MHz
  
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And we get a fully autonomous facedancer which can be even powered over USB and controlled remotely
  
−  
−
===Schematics===
  
−
<pre>
  
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MAX Signal RPi Signal
  
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P3 Vcc P17 3v3 \ 0.1uF -- GND
  
−
P4 Vcc P17 3v3 /
  
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P5 GND P25 GND
  
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P6 GND P25 GND
  
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P10 -RES P15 GPIO22
  
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P11 SCLK P23 SCLK
  
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P12 -SS P24 CE0
  
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P13 MISO P21 MISO
  
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P14 MOSI P19 MOSI
  
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P17 INT currently not connected, could be e.g. P13=GPIO27
  
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P18 GND P25 GND
  
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P19 GND P25 GND ---------- USB conn GND
  
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P20 D- ----------- R33 -- USB conn D-
  
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P21 D+ ----------- R33 -- USB conn D+
  
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P22 Vcc P17 3v3 \ 1uF -- GND
  
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P23 Vcc P17 3v3 /
  
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P24 VBCOMP ------------------ USB conn Vcc -- 1uF -- GND
  
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P26 XI ------------Xtal1- 18pF -- GND
  
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P27 XO ------------Xtal2- 18pF -- GND
  
−
</pre>
  
−
===First proto===
  
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[[File:Raspdancer-proto1.jpg|400px]]
  
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[[File:Raspdancer-proto1-full.jpg|400px]]
  
−  
−
===Code===
  
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Travis did an amazing job at building a Python library and examples for the MAX3420E, let's reuse them!
  
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<br>You'll need to get [[Raspberry_Pi#GPIO|GPIO Python support]] and [[Raspberry_Pi#SPI|SPI Python support]] for your Raspberry Pi.
  
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<br>From the original facedancer code, you'll need GoodFETMAXUSB.py and the goodfet.maxusb* scripts
  
−
<br>Then instead of the original GoodFET.py library, use [{{#file: GoodFET.py}} this GoodFET.py version]:
  
−
<source lang=python>
  
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#!/usr/bin/env python
  
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# (C) 2013 Philippe Teuwen <phil at teuwen.org>
  
−  
−
import spi
  
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import RPi.GPIO as GPIO
  
−  
−
class GoodFET:
  
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data=""
  
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def __init__(self, *args, **kargs):
  
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GPIO.setmode(GPIO.BOARD)
  
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# pin15=GPIO22 is linked to MAX3420E -Reset
  
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GPIO.setup(15, GPIO.OUT, initial=GPIO.LOW)
  
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GPIO.output(15,GPIO.HIGH)
  
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spi.openSPI(speed=26000000)
  
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def __del__(self):
  
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spi.closeSPI()
  
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GPIO.cleanup()
  
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def writecmd(self, app, verb, count=0, data=[]):
  
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if verb: # ignore all but R/W cmd
  
−
return
  
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if isinstance(data,str):
  
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data = [ord(x) for x in data]
  
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data = tuple(data)
  
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data = spi.transfer(data)
  
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self.data = "".join([chr(x) for x in data])
  
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def serInit(self):
  
−
pass
  
−
</source>
  
−
There are probably better ways to integrate it into the GoodFET software stack but with this small code snippet, you can take the latest great GoodFETMAXUSB.py and goodfet.maxusb* python scripts and just drop them along this GoodFET.py, without need for re-applying any patch.
  
−  
−
Note that with the raspdancer, goodfet.maxusbhid is becoming too fast and I'm missing the beginning of the injected string. I had to add some initial "NoEvent / key up" chars ("\x00" * 20) in typestring() in GoodFETMAXUSB.py:
  
−
<source lang=python>
  
−
def typestring(self):
  
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if self.typestrings.has_key(self.OsLastConfigType):
  
−
return ("\x00" * 20) + self.typestrings[self.OsLastConfigType];
  
−
else:
  
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return self.typestrings[-1];
  
−
</source>
  

Latest revision as of 14:11, 26 April 2013

Links

Making

I met Travis at Troopers2013 and he was very kind of giving me one Facedancer11 PCB.
I soldered the elements by reflow with solder paste in a kitchen pan, on a cooking paper and with good ventilation.

Installation

sudo apt-get install python-sqlite python-serial gcc-msp430
svn co https://goodfet.svn.sourceforge.net/svnroot/goodfet
cd goodfet/trunk/client/
sudo make link
cd goodfet/trunk/firmware/
goodfet.bsl --dumpinfo |tee info.txt

Mine: 

MSP430 Bootstrap Loader Version: 1.39-goodfet-8
Transmit default password ...
@1000
aa 55 ff 3f cd ab aa 55 34 12 ff ff aa 55 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff 20 84 fe 16 ff ff ff ff
ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff 08 10 00 80 01 00 11 80 9b 0b c2 0d 2a 80 f5 06 40 08 fe 08 ff ff ff ff ff ff ff ff 01 08 82 8f
8a 8e 7b 8d b3 86

My uC was a msp430f2619 so: 

cp lib/msp430f2617.c lib/msp430f2619.c
board=facedancer11 mcu=msp430f2619 make clean reinstall installinfo

Usages

goodfet.monitor listapps

GoodFET with f26f MCU
Clocked at 0x8f82
Build Date: 2013-03-28 23:38
Firmware apps:
Monitor
SPI
MAXUSB

goodfet.monitor testleds

Flashing LEDs
Flashed 1 LED.

goodfet.maxusb info

First connect target USB 

Connected to MAX342x Rev. 4

goodfet.maxusbftdi

goodfet.maxusbftdi

On target: 

cat /dev/ttyUSB0

Or, as sometimes previous command sends only one char at a time: 

screen /dev/ttyUSB0
[...]
GoodFET emulates FTDI properly, if you can read this!
[...]

goodfet.maxusbmass

dd if=/dev/zero of=test.img bs=512 count=10000
/sbin/mkfs.vfat test.img 
mkdir test
sudo mount -o loop test.img test
echo hello |sudo tee test/hello.txt
sudo umount test

goodfet.maxusbmass test.img

goodfet.maxusbhid

On target, chars are typed in an OS-dependent way: 

Python does USB HID on Linux!

goodfet.maxusbdfu

Emulating Ubertooth device to capture firmware: 

goodfet.maxusbdfu FFFF 0004

On target: 

./ubertooth-dfu --write bluetooth_rxtx.dfu
Checking firmware signature
............................................................................................
Write complete

Scapy support

http://rmspeers.com/archives/252

Raspdancer

Merging Facedancer & Raspberry Pi
See dedicated page: Raspdancer

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