Welcome to PC/SC Relay. The purpose of PC/SC Relay is to relay a smart card using an contact-less interface. Currently the following contact-less emulators are supported:
Command APDUs are received with the contact-less interface and relayed. The Response APDUs are then sent back via RFID. The contact-less data will be relayed to one of the following:
to a real smart card inserted into one of the systems’ smart card readers. The smart card reader must be accessible with PC/SC. The smart card may be contact-based or contact-less.
to a Virtual Smart Card that directly connects to pcsc-relay. The virtual smart card’s native interface is used and (despite its name) PC/SC Relay does not need to access PC/SC in this case.
Debug, Analyze and Emulate with PC/SC Relay
With PC/SC Relay you can relay a contact-less or contact based smart card over a long distance. Also you can use it in combination with the Virtual Smart Card to completely emulate an ISO/IEC 14443 smart card.
Emulate a contact-less German ID card to perform sanity checks
PC/SC Relay has the following dependencies:
PC/SC middleware
Note
This software can actually be used in a relay attack allowing full access to the card. We discussed the impact especially on the Relay attack against the German ID card, but it generally concerns all contact-less smart cards.
You can find the latest release of PC/SC Relay on Github. Older releases are still available on Sourceforge.
Alternatively, you can clone our git repository:
git clone https://github.com/frankmorgner/vsmartcard.git
The PC/SC Relay uses the GNU Build System to compile and install. If you are
unfamiliar with it, please have a look at INSTALL
. If you can not find
it, you are probably working bleeding edge in the repository. To generate the
missing standard auxiliary files you need to additionally install libtool and
pkg-config and run the following command in pcsc-relay
:
autoreconf --verbose --install
To configure (configure --help lists possible options), build and install the PC/SC Relay now do the following:
./configure
make
make install
Here is an example of how to get the standard installation of libnfc:
PREFIX=/tmp/install
LIBNFC=libnfc
git clone https://github.com/nfc-tools/libnfc $LIBNFC
cd $LIBNFC
autoreconf -i
# See `./configure --help` for enabling support of additional hardware
./configure --prefix=$PREFIX
make
make install
Building PC/SC Relay with libnfc is done best using pkg-config. The file
libnfc.pc
should be located in $INSTALL/lib/pkgconfig
. Here is how to
configure PC/SC Relay to use it:
./configure PKG_CONFIG_PATH=$PREFIX/lib/pkgconfig
The Android Smart Card Emulator is build around the host card emulation mode of
Android 4.4 and later. This mode activates the app if the terminal issues a
SELECT command with one of the app’s application identifiers. By default, the
app only registers for the AIDs for which it has a built-in emulator (see
ACardEmulator/app/src/main/res/xml/aid_list.xml
).
If used together with PC/SC Relay, you need to change add AIDs to match the applications on the relayed card. Otherwise the app will not be activated when it should relay command APDUs to PC/SC Relay.
Modify the Smart Card Emulator settings to use Remote Virtual Smart Card
as
Smart Card Emulator. Now start pcsc-relay by specifying
usage of the vpcd emulator:
pcsc-relay --emulator vpcd
In the app, change the VICC Hostname and VICC Port to match the location where pcsc-relay is waiting for an incoming connection. When the app receives a SELECT command to one of the configured AIDs, it will connect to pcsc-relay, which will then relay the command for processing.
Compiling and installing Android Smart Card Emulator is covered in its Download and Install section.
A PC/SC middleware is included by default in most modern operating systems. On Unix-like systems (Linux, OS X, Sun OS) it is realized by PCSC-Lite 3. To compile PC/SC Relay you will need to install the PCSC-Lite headers from your distribution.
Windows also ships with a PC/SC middleware in form of the Winscard module. PC/SC Relay can be (cross) compiled with MinGW-w64. Also, Microsoft’s developement environment Visual Studio includes all necessary data for building PC/SC Relay.
Usage: pcsc-relay [OPTION]...
Relay a smart card to a contactless interface
Using an contact-less interface (currently OpenPICC or libnfc) pcsc-relay
receives command APDUs which are forwared to an existing smart card via PC/SC.
pcsc-relay sends the response APDU back to the contact-less interface.
-h, --help Print help and exit
-V, --version Print version and exit
-e, --emulator=ENUM Contact-less emulator backend (possible
values="libnfc", "vpcd", "openpicc"
default=`libnfc')
-c, --connector=ENUM Smart card connector backend (possible
values="pcsc", "vicc" default=`pcsc')
-f, --foreground Stay in foreground (default=on)
-v, --verbose Use (several times) to be more verbose
PC/SC connector:
-r, --reader=INT Number of the PC/SC reader to use (-1 for
autodetect) (default=`-1')
Virtual Smart Card connector:
-p, --vpcd-port=INT Port for communicating virtual smart card
(default=`35963')
-n, --vpcd-hostname=STRING Hostname for connecting to virtual smart card
(default=`wait for an incoming connection')
Virtual Smart Card Reader emulator:
-P, --vicc-port=INT Port to listen for virtual smart card reader
(default=`35963')
-N, --vicc-hostname=STRING Hostname for connecting to virtual smart card
reader (default=`wait for an incoming
connection')
-A, --vicc-atr=STRING ATR (default=`3B80800101')
Report bugs to https://github.com/frankmorgner/vsmartcard/issues
Written by Frank Morgner and Dominik Oepen
Below we explain what option to choose for the emulator which receives a command APDU and transmits a response APDU back to the terminal:
Option |
|
---|---|
Emulation hardware supported via libnfc |
|
Emulation with OpenPICC |
|
Android Smart Card Emulator |
|
Virtual Smart Card |
|
Below we explain what option to choose for the connector which calculates a response APDU from a given command APDU:
Option |
|
---|---|
Contact-based Smart Card in PC/SC Reader |
|
Contact-less Smart Card in PC/SC Reader |
|
Contact-less Smart Card in Remote Smart Card Reader |
|
Virtual Smart Card |
|
Do you have questions, suggestions or contributions? Feedback of any kind is more than welcome! Please use our project trackers.