simtrace

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346 discussions

board questions regarding MitM
by Tom Schouten 28 Aug '13

28 Aug '13

Hi List, When the SIMtrace ciruit operates in MitM mode, the RST and VCC lines coming from the phone are very noisy from I/O line crosstalk in the flex cable. I see about 2V peak-to-peak on the scope! I am expecting it leads to spurious reset/poweroff detections. It might be helpful to add a filter on the AT91 side for RST and VCC. Maye an R/C filter that can be enabled by an I/O pin using 0/HI-Z switching? Another idea is to do enable the internal AT91 pin pullups. Just loading RST and VCC a bit might be enough. ( Another alternative is to filter RST and VCC measurements in software. I tried this but results are not very meaningful at this point.. ) Cheers, Tom

2 2

simtrace arduino due?
by Tom Schouten 16 Aug '13

16 Aug '13

Just an idea.. What about building a next version based on the Arduino Due? It's based on a SAM3X8E http://arduino.cc/en/Main/arduinoBoardDue

2 1

SIMtrace MITM/emulator
by Tom Schouten 16 Aug '13

16 Aug '13

Hi List, What is the current status of the MITM support? Anyone working on it behind the scenes? Also, I'd like to gauge how much work would be necessary to implement an emulator mode, with emulator running on PC. I.e. SIMtrace used to doe ATR handshake and then hand over all APDU to host PC over USB. Cheers Tom

5 26

MITM
by Tom Schouten 09 Aug '13

09 Aug '13

Hi List, Here are some bare-minimum code contributions for iso7816-3 slave side protocol. https://github.com/zwizwa/at91work/tree/apdu_phone git@github.com:zwizwa/at91work.git branch apdu_phone Relevant files are in: iso7816-slave-cdc-project/ src/ I spent a bit more time on this than expected on low-level platform stuff, leaving me with no time to smooth the rough edges at the PC interface side. It's a start, though. Features: - non-blocking iso7816-3 state machine for slave-side protocol (reusable in COS?) - low-level AT91 USART is abstracted as iso7816_port.h - line-oriented ASCII HEX protocol over CDC USB serial, easy to use in (python) scripts - transport is separate from state machine, easy to replace with other discussed mechanisms - works for me on Nexus One and BLU SAMBA JR plus Non-features: - hardcoded ATR - hardcoded power cycle skipping to select correct operating voltage - not using SIMtrace SIM slot (see mim.py for using a PC card reader to complete MITM) - did not test with DFU but should work (I used Atmel SAM-ICE) - standalone firmware, not integrated with CCID / sniffer - git history is messy. i'd just flatten it for further work

2 6

SIMtrace phone-side VCC
by Tom Schouten 30 Jul '13

30 Jul '13

Hi folks, Seems not all phones use 3V signaling if the PHONE-side VCC pin is tied to 3V. This one insists on 1.8V : BLU SAMBA JR PLUS Is this trick of tying VCC to 3V standard behavior? For future version of the board, it might be interesting to tie the VCC pin to an ADC input, to detect different voltage levels so the firmware can wait until phone decides to use 3V. Cheers Tom

3 4

ask about design sim card reader
by anak galer 25 Jul '13

25 Jul '13

hello , anyone have schematic design sim reader PC/SC , yesterday i'm make some reader but not support with PC/SC apps in here (http://git.osmocom.org/osmo-sim-auth | A smart card reader compatible with pcsc-lite) i think my card support with phoenix reader? and anyone can explain the differences between the PC / SC with phoenix sim reader or etc Regards

2 1

Fwd: Cellphone can't detect sim card
by Tali Budur 24 Jul '13

24 Jul '13

Hi! I have built 2 units of simtrace hardware recently. All the components came from digikey, I used the bom list from git. The PCBs are electrically tested. When I connected it to the pc, simtrace application can communicate with the device and I can debug it via the FTDI connection. The problem is, when I connect it to a cellphone, cellphone can not detect a sim card. Simtrace can detect vcc on, vcc off and rst signals from the cellphone however, cellphone can not detect the sim card. I used several different cell phones and sim cards. I also checked the connection between the cellhpone and simtrace. Couldn't find a problem. May I kindly request your help to solve the problem? Thanks,

2 1

rebooting the smartphone.
by Francisco Marinho 23 Jul '13

23 Jul '13

hi guys I have a problem with the simtrace, when I restart the smartphone some APDU are smaller than 8 bits, this is a know issue? Francisco Marinho

1 0

SIM tracer for Saleae Logic
by Tom Schouten 10 Jul '13

10 Jul '13

Hi List, This might be of interest to folks here. A couple of days ago I found out the Saleae Logichas an SDK that allows you to live stream raw sample data straight into a C++ application. Quite neat, as it can go to fairly high sample rates. Here is a proof of concept version of a live APDU protocol sniffer using the SL: https://github.com/zwizwa/sl-apdu Essentially it's just a UART state machine with some hardcoded ATR parsing (for the specific SIM card I have) which calls into apdu_split from git://git.osmocom.org/simtrace.git after the ATR handshake. I had a look at the ISO7816 parser in the SIMtrace firmware, but it's fairly tied to the hardware. With some refactoring it's probably easy to reuse. ( The sl-apdu repo has a first attempt to a dirty stub approach to run the original AT91 code. Probably not be the way to go.. ) Cheers Tom

1 0

Not able to open the SIMtrace user manual
by Shreyas Hegde 22 Jun '13

22 Jun '13

The user-manual downloaded fromhttp:// bb.osmocom.org/trac/attachment/wiki/SIMtrace/usermanual.pdf is indicated as damaged by PDF readers. Thanks and Regards Shreyas

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