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MaCAN

Message Authenticated CAN library & tools written in C.

This library implements MaCAN protocol [1, [2]], which improves Controller Area Network security. MaCAN network consists from a keyserver, a timeserver and one or more nodes (a.k.a. ECUs). Supported platforms currently include GNU/Linux and Infineon Tricore TC1798 and STM32.

The project is divided into several, relatively independent parts:

MaCAN library

The MaCAN library is used in any node (incl. keyserver and timeserver) participating in MaCAN communication. Library's API is defined in macan.h file. Other functions are internal to the library. This API is documented in Doxygen docs located in docs/ directory. For actual code examples on how to use this library, see Demos section below.

Keyserver

Provides session keys to other nodes. When run on Linux, the following command line parameters are supported:

  • -c configuration.so

    Path to the shared object with configuration.

  • -k allkeys.so

    Path to the shared object with long term keys of every node.

  • -d CAN interface

Timeserver

Provides plain and authenticated time signals to nodes. When run on Linux, the following command line parameters are supported:

  • -c configuration.so

    Path to the shared object with configuration.

  • -k key.so

    Path to the shared object with timeserver's long term key.

  • -d CAN interface

MaCAN Monitor

Dumps traffic on CAN bus and interprets MaCAN frames, useful for debugging (GNU/Linux only). The following command line parameters are supported:

  • -c configuration.so

    Path to the shared object with configuration.

Configuration

MaCAN configuration is done statically by filling the following information (as defined in macan.h):

  • struct macan_config - main MaCAN configuration (number of nodes, timing, etc.)
  • struct macan_sig_spec -- signal configuration
  • ecu2canid_map[] -- ECU-ID to CAN-ID mapping

This configuration is then compiled into shared object file (on Linux) or to a static library (on embedded platforms) and used by all participating nodes.

For security reasons, long-term keys (LTK) are compiled separately into:

  1. object files (one per key) and linked to appropriate nodes (statically or, in case of time server, dynamically).
  2. single shared object file (containing all keys), which is used by the keyserver only.

Demos

Several example projects are located in the demos/ directory. Each demo contains helper shell scripts, which wrap commands and their options, so you don't need to type them by hand. Scripts are located in demos/XYZ/test directory. Each demo typically includes following scripts:

  • init-vcan.sh - initialize virtual CAN interfaces (should be invoked first)
  • ks.sh - launch keyserver
  • ts.sh - launch timeserver
  • nodeX.sh - launch node X (where X is ECU-ID of node)
  • macanmon.sh - launch MaCAN monitor (optional)

Compiling on GNU/Linux

MaCAN library requires a low level cryptographic library Nettle. To compile the entire project (incl. library, keyserver, timeserver and demos), invoke:

make

in build/linux. Compiled binaries are located in the _compiled subdirectory.

Compiling for Infineon TriCore TC1798

To compile MaCAN for TriCore, Infineon's proprietary AUTOSAR MCAL drivers are needed. There is a project file for Altium TASKING IDE configured to compile node from demo projects, which runs on TC1798 CPU. Only one demo can be compiled at a time, others need to be excluded from build.

References

[1] Oliver Hartkopp, Cornel Reuber and Roland Schilling, MaCAN - Message Authenticated CAN, ESCAR 2012.
[2] [Ondřej Kulatý, Message authentication for CAN bus and AUTOSAR software architecture][2], master's thesis. [2]: http://rtime.felk.cvut.cz/~sojka/students/Dp_2015_kulaty_ondrej.pdf

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