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HALucinator - Firmware rehosting through abstraction layer modeling.

Setup

Note: This has only been tested on Ubuntu 16.04.

  1. Install dependencies and create the halucinator virtual environment using the create_venv.sh script.
  2. Activate the virtual environment: source ~/.virtualenv/halucinator/bin/activate
  3. Run setup.sh script in the root directory. This will install dependencies, get avatar and build the needed version of qemu.

Running

Running Halucinator requires a configuration file that lists the functions to intercept and the handler to be called on that interception. It also requires an address file linking addresses to function names, and a memory file that describes the memory layout of the system being emulated. The firmware file is specified in the memory file.

Examples of these files are given in the test directoy.

workon halucinator
./halucinator -c=<config_file.yaml> -a=<address_file.yaml> -m=<memory_file.yaml>

Running an Example

Building STM MX Cube Examples

This has already been done for Uart example file below.

A tool to convert the STM's Software Workbench for STM (SW4STM) was developed to enable compiling their IDE projects using make. This has only been tested on a few STM32F4 examples from STM32Cube_F4_V1.21.0. It compiles them as cortex-m3 devices and not cortex-m4 to enable easier emulation in QEMU.

To use go into the directory below the SW4STM32 directory in the project and run python3 <halucinator_repo_root>/src/tools/stm_tools/build_scripts/CubeMX2Makefile.py . Enter a name for the board, and the applications. Then run make all. The binary created will be in bin directory

Example

cd STM32Cube_FW_F4_V1.21.0/Projects/STM32469I_EVAL/Examples/UART/UART_HyperTerminal_IT/SW4STM32/STM32469I_EVAL
python3 <halucinator_repo_root>/src/tools/stm_tools/build_scripts/CubeMX2Makefile.py .
Board: STM32469I_Eval
APP: Uart_IT
make all

STM32F469I Uart Example

To give an idea how to use Halucinator an example is provided in test/STM32/example.

Setup

Note: This was done prior and the files are in the repo in test/STM/example. If you just want to run the example without building it just go to Running below.

This procedure should be followed for other binaries. In list below after the colon (:) denotes the file/cmd .

  1. Compile binary as above
  2. Copy binary to a dir of you choice and cd to it: test/STM32/example
  3. Create binary file: <halucinator_repo_root>/src/tools/make_bin.sh Uart_Hyperterminal_IT_O0.elf creates Uart_Hyperterminal_IT_O0.elf.bin
  4. Create Memory Layout (specifies memory map of chip): Uart_Hyperterminal_IT_O0_memory.yaml
  5. Create Address File (maps function names to address): Uart_Hyperterminal_IT_O0_addrs.yaml
  6. Create Config File (defines functions to intercept and what handler to use for it): Uart_Hyperterminal_IT_O0_config.yaml
  7. (Optional) create shell script to run it: run.sh

Note: the Memory file can be created using src/halucinator/util/elf_sym_hal_getter.py from an elf with symbols. This requires installing angr in halucinator's virtual environment. This was used to create Uart_Hyperterminal_IT_O0_addrs.yaml

To use it the first time you would. Install angr

source ~/.virtualenvs/halucinator/bin/activate
pip install angr

Then run it as a module in halucinator

python -m halucinator.util.elf_sym_hal_getter -b <path to elf file>

Running

Start the UART Peripheral device, this a script that will subscribe to the Uart on the peripheral server and enable interacting with it.

workon halucinator
<halucinator_repo_root>$python -m halucinator.external_devices.uart -i=1073811456

In separate terminal start halucinator with the firmware.

workon halucinator
<halucinator_repo_root>$./halucinator -c=test/STM32/example/Uart_Hyperterminal_IT_O0_config.yaml \
  -a=test/STM32/example/Uart_Hyperterminal_IT_O0_addrs.yaml \
  -m=test/STM32/example/Uart_Hyperterminal_IT_O0_memory.yaml --log_blocks -n Uart_Example

or
<halucinator_repo_root>$test/STM32/example/run.sh

Note the --log_blocks and -n are optional.

You will eventually see in both terminals messages containing

 ****UART-Hyperterminal communication based on IT ****
 Enter 10 characters using keyboard :

Enter 10 Characters in the first terminal running the uart external device and press enter should then see below in halucinator terminal

INFO:STM32F4UART:Waiting for data: 10
INFO:STM32F4UART:Got Data: 1342154134
INFO:STM32F4UART:Get State
INFO:STM32F4UART:Writing: 1342154134
INFO:STM32F4UART:Get State
INFO:STM32F4UART:Writing:
 Example Finished

Stopping

Avatar creates many threads and std input gets sent to QEMU thus killing it is not trivial. I usually have to kill it with ctrl-z and kill %, or killall -9 halucinator

Logs are kept in the <directory of the config file>/tmp/<value of -n option. e.g test/STM32/example/tmp/Uart_Example/

TODOs

Document what is in config file, address files, and memory files