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Version 21 (laforge, 08/26/2018 10:12 AM) → Version 22/24 (jbruckner, 01/11/2019 10:37 AM)

h1. Osmocom SIMtrace 2

{{>toc}}

Osmocom SIMtrace 2 is a software, firmware and hardware system for passively tracing SIM-ME communication between the SIM card and the mobile phone, and remote SIM operation.
While it was designed for SIM-ME communication, it supports all ISO 7816 smart-cards using the T=0 protocol (the most common case).

It is a followup of the "SIMtrace project":/projects/simtrace/wiki, providing more functionalities (e.g. remote SIM operation) and supporting multiple boards (e.g. SIMtrace with SAM3S, "sysmoQMOD":https://www.sysmocom.de/products/sysmoqmod/index.html).

h2. Hardware

The SIMtrace 2 firmware supports several boards.
The firmware is written for an "ATSAM3S4B":https://www.microchip.com/wwwproducts/en/ATSAM3S4B micro-controller.

Note: The SAM3S is meanwhile labelled as _not recommended for new designs_ by Atmel. However, there are plenty of hardware and software compatible upgrade options, including SAM4S. The upgrade is possible in the future.

h3. SIMtrace v2

!{width:20%}simtrace-board-mini.jpg!

The main purpose of this board is to sniff the communication between a phone and a SIM card (or any card reader and smart-card).

This is the same circuit board as the previous "SIMtrace v1":/projects/simtrace/wiki/SIMtrace_Hardware, with the exception that the "ATSAM3S4B":https://www.microchip.com/wwwproducts/en/ATSAM3S4B micro-controller replaces the old "AT91SAM7S64":https://www.microchip.com/wwwproducts/en/AT91SAM7S64. Since the SAM3S is pin compatible with the SAM7S, any SIMtrace v1 board can be converted into a SIMtrace v2 board simply by replacing the micro-controller.

Note: This hardware is "open source":https://git.osmocom.org/simtrace/tree/hardware.

h3. sysmoQMOD

!{width:25%}sysmoqmod.png!

The SAM3S micro-controller with SIMtrace 2 firmware is also used on the "sysmoQMOD":https://www.sysmocom.de/products/sysmoqmod/index.html board to provide remote SIM operation capabilities.

Note: This hardware is not open source.

h2. Firmware

The SIMtrace 2 firmware source code is available in "git":https://git.osmocom.org/simtrace2/.
Pre-built firmware binaries are available "here":http://ftp.osmocom.org/binaries/simtrace2/firmware/.
The firmware are currently under active development and we recommend to [[Flashing|flash]] the new firmware images to profit from the latest bug fixes and added functionalities.

The SIMtrace 2 firmware is a complete rewrite and *can only be flashed on hardware with SAM3S* ARM Cortex-M3-based micro-controllers.
*The SIMtrace 2 firmware is not compatible with the older "SIMtrace v1":/projects/simtrace/wiki/SIMtrace_Hardware using SAM7S ARM7TDMI-based micro-controllers.*

h3. trace

The trace application firmware allow to sniff the communication between a phone and a SIM card (or any card reader and smart-card).
It is intended for the [[Wiki#SIMtrace v2|SIMtrace v2 hardware]] and its function is analog to the "SIMtrace v1":/projects/simtrace/wiki/SIMtrace_Firmware.

The sniffing is completely passive. It uses the RST, ATR, PPS (baud rate tested with F/D up to 512/32), and WT (waiting timeout) to properly parse the ISO 7816-3 TPDUs.
Currently only the T=0 protocol is supported since this is the most common protocol used (we haven't seen T=1 in use).

!{width:25%}simtrace_and_phone.jpg!

The application firmware to be flashed using [[Flashing#DFU|DFU]] is "simtrace-trace-dfu.bin":http://ftp.osmocom.org/binaries/simtrace2/firmware/simtrace-trace-dfu.bin.

h3. Development

To compile the firmware using the source code, or participate in the development, please refer to the instructions provided in the "README":https://git.osmocom.org/simtrace2/tree/firmware/README.txt .

h2. Flashing

The [[Wiki#Firmware|firmware images]] can be flashed as described [[Flashing|here]].



h2. Host PC Software

The SIMtrace 2 host PC software are available in the "simtrace2 git":https://git.osmocom.org/simtrace2/.

h3. Preconditions

[[libosmocore:]], libpcsclite [[libosmocore:]] and libusb.

to install those both packages:
<pre>
sudo apt-get install libusb-1.0-0-dev libosmocore-dev libpcsclite-dev

</code></pre>

h3. Compiling it

<pre>
git clone git://git.osmocom.org/simtrace2.git
cd simtrace2/host/
make
</pre>

h3. Accessing it

Add udev rules so to be able to use SIMtrace 2 devices and access the device as non-root user:
<pre>
# add current user to plugdev group (user needs to re-login for this change to take effect)
sudo adduser $USERNAME plugdev
# grant access permission to SIMtrace 2 for plugdev group
sudo wget -O /etc/udev/rules.d/99-simtrace2.rules https://git.osmocom.org/simtrace2/plain/host/99-simtrace2.rules
# reload udev rules
sudo udevadm control --reload-rules
sudo udevadm trigger
</pre>

h3. Applications

h4. simtrace2-list

@simtrace2-list@ allows to list all SIMtrace 2 compatible devices:
<pre>
./simtrace2-list
USB matches: 1
1d50:60e3 Addr=4, Path=2-2.3, Cfg=1, Intf=0, Alt=0: 255/1/0 (SIMtrace Sniffer)
</pre>

This is useful when you have multiple devices (such as with the [[Wiki#sysmoQMOD]]) and have to specific with device to use by the other applications.

h4. simtrace2-sniff

This will use the [[Wiki#trace|trace]] firmware and retrieve the sniffed phone-SIM communication.
The activity will be shown on the consol output:
<pre>
./simtrace2-sniff
simtrace2-sniff - Phone-SIM card communication sniffer
(C) 2010-2017 by Harald Welte <laforge@gnumonks.org>
(C) 2018 by Kevin Redon <kredon@sysmocom.de>

Using USB device 1d50:60e3 Addr=4, Path=2-2.3, Cfg=1, Intf=0, Alt=0: 255/1/0 (SIMtrace Sniffer)
Entering main loop
Card state change: reset hold
Card state change: reset release
ATR: 3b 9f 96 80 1f c7 80 31 a0 73 be 21 13 67 43 20 07 18 00 00 01 a5
PPS: ff 10 96 79
PPS: ff 10 96 79
Fi/Di switched to 512/32
TPDU: a0 a4 00 00 02 3f 00 9f 22
TPDU: a0 a4 00 00 02 7f 20 9f 22
TPDU: a0 a4 00 00 02 6f 46 9f 0f
TPDU: a0 b0 00 00 11 81 43 43 43 20 45 76 65 6e 74 ff ff ff ff ff ff ff 90 00
Card state change: reset hold
</pre>

The TPDU will also be sent the GSMTAP frames to UDP/IPv4 localhost:4729.
This also allows to analyze the communication in wireshark using the GSM SIM dissector.
!{width:50%}wireshark-sim.png!

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