SIM card related Projects » SIMtrace 2

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h1. Cardem

Card emulation (cardem for short) is a firmware for the SIMtrace v2 board allowing to emulate cards (e.g. SIM).

You then can leave the card adapter cable in the reader (e.g. phone), and have the actual card outside.

This allows to easily change or reprogram the card without having to touch the phone.

This functionality is already implemented and working on sysmoQMOD board.

It is not also available for SIMtrace v2 boards.

*This is a beta firmware and still in development*.

See [[Cardem#Limitations|limitations]] for known limitations and issues.

h2. Flashing

You can download the beta firmware for the SIMtrace v2 board here: attachment:simtrace-cardem-flash.bin.

To flash the firmware on the board:

<pre>

dfu-util --device 1d50:60e3 --cfg 1 --alt 1 --reset --download simtrace-cardem-flash.bin

</pre>

For more details about the flashing procedure, read [[Flashing#SIMtrace2-board|this article]].

h2. Software

With the cardem firmware, the SIMtrace v2 board mainly forwards the ISO 7816 card communication over USB.

A software on the host must receive the APDU requests and send the corresponding APDU response.

There are several software available to do that.

Since the USB messages are "specified":https://git.osmocom.org/simtrace2/tree/firmware/libcommon/include/simtrace_prot.h and the software is "open source":https://git.osmocom.org/simtrace2/tree/host, you could implement your own APDU handler.

h3. simtrace2-remsim

@simtrace2-remsim@ is the simplest solution.

If forwards the APDU request/response to/from a PCSC card reader.

To get @simtrace2-remsim@:

* Install required packages to compile the software:

<pre>

sudo apt-get install libusb-1.0-0-dev libosmocore-dev libpcsclite-dev

</pre>

* Get and compile the software:

<pre>

git clone git://git.osmocom.org/simtrace2.git

cd simtrace2/host/

make

</pre>

To use @simtrace2-remsim@:

# power off phone

# insert card adapter cable into phone

# insert card adapter cable SIMtrace v2 board

# plug SIMtrace v2 board in host computer USB port

# connect external card reader to host (any USB CCID reader should do the job)

# install PCSC daemon (only needs to be done once)

<pre>

sudo apt install pcscd

</pre>

# ensure the PCSC daemon is started

<pre>

sudo systemctl start pcscd

</pre>

# install tool to check reader status

<pre>

sudo apt install pcsc-tools

</pre>

# check if the card is detected by the reader (use CTRL-C to exit)

<pre>

pcsc_scan 

Using reader plug'n play mechanism

Scanning present readers...

0: OMNIKEY 6321 CLi USB (OKCM0030506091345044320140749730) 00 00

Tue Sep 10 16:03:49 2019

 Reader 0: OMNIKEY 6321 CLi USB (OKCM0030506091345044320140749730) 00 00

  Event number: 0

  Card state: Card inserted, 

  ATR: 3B 9F 94 80 1F C7 80 31 E0 73 FE 21 1B 67 01 00 00 04 4D 02 01 99

</pre>

# get SIMtrace USB path (this step will soon be not required anymore)

<pre>

dfu-util -l

...

Found Runtime: [1d50:60e3] ver=0002, devnum=59, cfg=1, intf=1, path="1-2.2", alt=0, name="UNKNOWN", serial="UNKNOWN"

</pre>

# start @simtrace2-remsim@ with corresponding USB path (here 1-2.2)

<pre>

./simtrace2-remsim --usb-vendor 1d50 --usb-product 60e3 --usb-path 1-2.2 --usb-config 1

(C) 2010-2017, Harald Welte <laforge@gnumonks.org>

(C) 2018, sysmocom -s.f.m.c. GmbH, Author: Kevin Redon <kredon@sysmocom.de>

SCardEstablishContext: OK

SCardListReaders: OK

SCardConnect: OK

<- 01 05 00 00 00 00 09 00 01 

<- 02 02 00 00 00 00 09 00 01 

<= cardem_request_set_atr(3b 00 )

<- 01 02 00 00 00 00 0b 00 02 3b 00 

<- 02 01 00 00 00 00 0b 00 02 2c 01 

Entering main loop

</pre>

# now you can power on the phone (only after @simtrace2-remsim@ is started since @simtrace2-remsim@ can't tell the phone a card has been inserted). you should also see some APDU traffic

<pre>

URB: 01 06 00 00 00 00 13 00 01 00 00 00 05 00 a0 a4 00 00 02 

-> 01 06 00 00 00 00 13 00 01 00 00 00 05 00 a0 a4 00 00 02 

=> DATA: flags=1, a0 a4 00 00 02 : CLA=a0 INS=a4 P1=00 P2=00 P3=02; case=4, lc=2(0), le=0(0)

<= cardem_request_pb_and_rx(a4, 2)

<- 01 01 00 00 00 00 0f 00 08 00 00 00 01 00 a4 

URB: 01 06 00 00 00 00 10 00 02 00 00 00 02 00 7f 20 

-> 01 06 00 00 00 00 10 00 02 00 00 00 02 00 7f 20 

=> DATA: flags=2, 7f 20 : CLA=a0 INS=a4 P1=00 P2=00 P3=02; case=4, lc=2(2), le=0(0)

TX: a0 a4 00 00 02 7f 20 

SCardEndTransaction: OK

RX: 9f 17 

SW=0x9f17, len_rx=0

<= cardem_request_sw_tx(9f 17)

<- 01 01 00 00 00 00 10 00 06 00 00 00 02 00 9f 17 

URB: 01 06 00 00 00 00 13 00 01 00 00 00 05 00 a0 f2 00 00 17 

-> 01 06 00 00 00 00 13 00 01 00 00 00 05 00 a0 f2 00 00 17 

=> DATA: flags=1, a0 f2 00 00 17 : CLA=a0 INS=f2 P1=00 P2=00 P3=17; case=2, lc=0(0), le=23(0)

TX: a0 f2 00 00 17 

SCardEndTransaction: OK

</pre>

h3. osmo-remsim

"osmo-remsim":/projects/osmo-remsim/wiki is a separate project allowing to have the card/SIM at a different location than the modem/phone. It also allows to manage multiple cards and emulators. The setup is a bit more complicated though.

# @osmo-remsim@ uses PCSC to access card readers (this setup only needs to be done once)

** connect external card readers to host (any USB CCID reader should do the job)

** install PCSC daemon

<pre>

sudo apt install pcscd

</pre>

** ensure the PCSC daemon is started

<pre>

sudo systemctl start pcscd

</pre>

** install tool to get reader name

<pre>

sudo apt install pcsc-tools

</pre>

** get reader name (use CTRL-C to exit)

<pre>

pcsc_scan 

Using reader plug'n play mechanism

Scanning present readers...

0: OMNIKEY 6321 CLi USB (OKCM0030506091345044320140749730) 00 00

</pre>

** create a @bankd_pcsc_slots.csv@ file listing the card readers @osmo-remsim@ should use. The CSV format is: user provided bank number (collection of readers/slots), user provided slot number (individual card in reader/bank), PCSC reader name.

<pre>

echo << EOF > bankd_pcsc_slots.csv

"1","1","OMNIKEY 6321 CLi USB (OKCM0030506091345044320140749730) 00 00"

EOF

</pre>

# install @osmo-remsim@

** add the "osmo-remsim":/projects/cellular-infrastructure/wiki/Binary_Packages repository (so you don't have to compile osmo-remsim yourself)

** install @osmo-remsim@:

<pre>

sudo apt install osmo-remsim

</pre>

# run the server. This is the central instance telling the bankd which reader to use, and the client which bankd to contact. *the @bankd_pcsc_slots.csv@ file must be in the current working directory*

<pre>

osmo-remsim-server

</pre>

# the server needs to be additionally configured through its RESTful interface. For that we will use the small tool @remsim-apitool.py@

** download @remsim-apitool.py@

<pre>

wget https://git.osmocom.org/osmo-remsim/plain/contrib/remsim-apitool.py

</pre>

** tell the server client 1 with slot 1 (on the modem side) should use bank 1 slot 1 (on the reader side). This must be done every time after to server is started.

<pre>

python remsim-apitool.py --create-slotmap 1 1 1 1

</pre>

# run the bankd. This will contact the server (which can be on another host) to know which card reader it will manage. Here we tell it will take care of the card reader from bank 1.

<pre>

osmo-remsim-bankd --server-host localhost --server-port 9998 --bank-id 1

</pre>

# now we need to actually emulate the card

** power off phone

** insert card adapter cable into phone

** insert card adapter cable SIMtrace v2 board

** plug SIMtrace v2 board in host computer USB port

** get SIMtrace USB path (this step will soon be not required anymore)

<pre>

dfu-util -l

...

Found Runtime: [1d50:60e3] ver=0002, devnum=59, cfg=1, intf=1, path="1-2.2", alt=0, name="UNKNOWN", serial="UNKNOWN"

</pre>

** start the @osmo-remsim-client-st2@ client with corresponding USB path (here 1-2.2). This will contact the server (which can be on another host) to know which bankd to contact. Here we tell it will take care of slot 1 of modem 1 (SIMtrace can only emulate one card).

<pre>

osmo-remsim-client-st2 --usb-vendor 1d50 --usb-product 60e3 --usb-path 1-2.2 --usb-config 1 --client-id 1 --client-slot 1 --server-host localhost --server-port 9998

</pre>

** you can now power on the phone, and should see some APDU traffic on the client and bankd.

h2. Limitations

Here are the known limitations:

* there is no way for SIMtrace to tell the reader that a new card has been inserted. There is no specified way to do it (e.g. in ISO 7816 standard). This is generally done inside the reader hardware by a mechanical switch. The only way around is to restarted the reader (e.g. phone).

* the cardem is currently a separate firmware. it is planned to combine it with the trace firmware (the software will then select the right functionality)

* the firmware ignores the sent ATR (sent by the software, from the card to forward). this is to prevent the reader from switching to a yet untested baud rate

* the error messages returned by @simtrace2-remsim@ are not very useful

* @simtrace2-remsim@ does not automatically reconnect to the SIMtrace board when the hardware is reset

* you have to specify the USB path to @simtrace2-remsim@

* no long term tests have been performed (this is already planned)

* you can't use the card reader built in SIMtrace

* @simtrace2-remsim@ does not send the APDU to GSMTAP so you can trace the traffic using wireshark

* @simtrace2-remsim-udp@ does not connect to SIMtrace v2 boards

We are currently working on resolving these issues.

If you found yet unknown issues, you can report them to the main developer at kredon AT sysmocom DOT de.

If possible, please also attach the corresponding debug serial output. To get the serial output, connect a USB to UART cable either to the 2.5 mm stereo headphone connector (tip = TX, ring = RX, sleeve = GND) or the nearby DEBUG port (pin 1 = GND, pin 4 = TX, pin 5 = RX). Open the serial port with the following configuration: 921600 8N1.