Osmocom SIMtrace 2¶
- Table of contents
- Osmocom SIMtrace 2
- Host PC Software
- Binary Packages
- Commercial Support
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).
The SIMtrace 2 firmware supports several boards.
The firmware is written for an 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.
SIMtrace board for SIMtrace 2 project¶
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, with the exception that the ATSAM3S4B micro-controller replaces the old 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 hardware
SIMtrace2 hardware availability¶
Fully assembled SIMtrace2 boards and related accessories like FPC cables can be obtained from the sysmocom webshop
This is a carrier board for cellular modems in ngff / M.2 form-factor with on-board simtrace2. It is wired in a way that it can operate both as passive tracer/sniffer, or in
See ngff-cardem for all information on the ngff-cardem board, including design files.
Note: This hardware is open source hardeware
Fully assembled ngff-cardem boards can be obtained from the sysmocom webshop
The SAM3S micro-controller with SIMtrace 2 firmware is also used on the sysmoQMOD board to provide remote SIM operation capabilities.
Note: This hardware is not open source.
sysmoQMOD hardware availability¶
Fully assembled sysmoQMOD boards and related products can be obtained from sysmocom
The SIMtrace 2 firmware source code is available in git
Pre-built firmware binaries are available here.
The firmware are currently under active development and we recommend to 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 using SAM7S ARM7TDMI-based micro-controllers.
To get the version of the firmware flashed on the device, you can use the
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 SIMtrace v2 hardware and its function is analog to the SIMtrace v1.
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).
The card emulation application firmware allows to emulate a card (e.g SIM). This is useful if you don't want to change the card in the device (e.g. phone), or have the card in a remote location.
This firmware comes preflashed on the sysmoQMOD board.
It also exists from the SIMtrace v2 board, but is currently in beta. If you still would like to try it, read this article.
To compile the firmware using the source code, or participate in the development, please refer to the instructions provided in the README
Host PC Software¶
The source code of the SIMtrace 2 host PC software are available in the simtrace2 git
Binary packages are made available for a variety of Linux distributions, see Binary_Packages for more details. In case of doubt, use the nightly builds.
Installing binary packages¶
We assume that you've added the binary package feed, for example as described at Nightly_Builds.
All you need to do is to do
$ sudo apt-get install simtrace2-utils
Building from source¶
this assumes you are a software developer familiar with building software from source using GNU autotools. If you're not, please use the binary packages (see above).
libosmocore, libpcsclite and libusb.
to install those packages:
sudo apt-get install libusb-1.0-0-dev libosmocore-dev libpcsclite-dev
git clone https://gitea.osmocom.org/sim-card/simtrace2.git cd simtrace2/host/ autoreconf -fi ./configure make
Add udev rules so to be able to use SIMtrace 2 devices and access the device as non-root user:
# 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://gitea.osmocom.org/sim-card/simtrace2/raw/branch/master/host/contrib/99-simtrace2.rules # reload udev rules sudo udevadm control --reload-rules sudo udevadm trigger
simtrace2-list allows to list all SIMtrace 2 compatible devices:
./simtrace2-list USB matches: 1 1d50:60e3 Addr=4, Path=2-2.3, Cfg=1, Intf=0, Alt=0: 255/1/0 (SIMtrace Sniffer)
This is useful when you have multiple devices (such as with the Wiki) and have to specify which device to use by other applications.
This will use the trace firmware and retrieve the sniffed phone-SIM communication.
The activity will be shown on the console output:
./simtrace2-sniff simtrace2-sniff - Phone-SIM card communication sniffer (C) 2010-2017 by Harald Welte <email@example.com> (C) 2018 by Kevin Redon <firstname.lastname@example.org> 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
The TPDU will also be sent via GSMTAP frames to UDP/IPv4 localhost:4729. This means you can have other programs that process and further decode the data. This also means you can create pcap files of the SIM TPDUs by e.g. tcpdump using a command line like
tcpdump -npi lo -w /tmp/my_pcap_file.pcap udp port 4729.
The real-time TPDU stream (via GSMTAP) or the recorded pcap file containing GSMTAP can be analyzed in other programs such as
- wireshark (general-purpose network protocol analyzer, https://wireshark.org/)
- very basic decoder only at the the CLA/INS level, knows some FIDs without understanding filesystem hierarchy
- primarily focussed on classic GSM SIM cards
- doesn't receive much love
- nice GUI
pySim-trace.py(part of pySim suite of SIM card related tools)
- very complete/comprehensive decode all the way up into the contents of the files read/written
- primarily focussed on modern UICC/USIM/ISIM cards
- no GUI at all
wireshark using the GSM SIM dissector.
Osmocom provides binary packages for several flavors of Debian and Ubuntu GNU/Linux on a variety of architectures (i586, x86_64, armhf, armv7l). Unless you are a software developer interested in developing on Osmocom, it is recommended you use those packages instead of building from source.
For more details see Binary_Packages
Commercial support as well as development, system integration and training services for this project are available from sysmocom