BareDroid

BareDroid allows for bare-metal analysis on Android devices. See the paper (#)[here]

Folders

backup: used to create a backup of the device. It is a bash script which stores a copy of:

• userdata
• system
• boot in the store partition (partition number 30). This is needed only when you want to setup a new device.

restore: used to restore a previous backup. It is a bash script which restore a) system, b) userdata and c) userdatanew partition.

backup_and_restore: used to create a backup and restore it. It is a merge of the previous scripts.

setup_device:

• setup: used to setup a device. Basically, this script creates the new partitions;

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update: contains the python scripts used to manage the infrastructure.

• adb.py: provides APIs used to send command through adb shell;
• device.py: contains information about the update_manager associated to the device (deprecated, not used in the next version);
• analysis.py: it bridges the gap between the infrastructure and the experiments. For a detailed description see below;
• util.py: provides utilities (deprecated);
• manager.py: manages the command line interface;
• updtae_manager.py: it is the core of the infrastructure. It is a separate process which manages the update and analysis process;
• update_manager_device.py: represents a separate process used to update the device during the analysis;
• update_manager_recovery.py: represents a separate process used to update the device during the reboot. it is used to perform a relabel of the userdata partition ( SELinux :) );

update/config: contains cfg and info files used to setup the python scripts.

• config.cfg: contains the information about where to save the logs, and which scripts use to perform the analysis
• devices.info: contains general information about the devices (e.g., user, AndroidId)

How to backup

1. connect the device
2. run the "./script" file (the script reboots the device in recovery mode and run the script)
3. reboot the device

How to restore

1. connect the device
2. run the "./script" file (the script reboots the device in recovery mode and run the script)
3. reboot the device

Analysis script

The goal of this script is to provide a wrapper between the experiment and the infrastructure, SetupAndStart is the main method and the only one called by the infrastructure (i.e., update_manager.py line 178). It setups the environment for the experiment (e.g., adb root) and run the experiment. If you want to use your code in an experiment you need to:

1. modify the config.cfg file. In the stanza 'Project' put the absolute path to the code that you want to use;
2. create an python script containing the class used in the stanza 'class' of the config.cfg file;
3. define a 'run' method in the config.cfg file. This is the method used by the wrapper to start the experiment.

how to add a new device to the infrastructure

1. see 'setup_device';
2. run the backup and restore scripts;
3. add info to the 'update/config/device.info' file (e.g., AndroidId); [mandatory]

general consideration:

4. device -> Settings -> Storage -> USB computer connection -> disable MTP
5. device -> Security -> Screen lock -> None
6. be sure you can install untrusted app (i.e., from outside the market)

How to run an experiment

Architectural overview:

1. to run an experiment you need to include the absolute path of the folder containing the samples to analyze;
2. run the manager start script against the folder containing the apps to analyze;

example

./start_baredroid path/to/folder/containing/samples

3. the script will prompt a command line interface which allows the user to interact with the infrastructure (e.g., start experiment);
4. select option '2' to run the experiment;
5. when the experiment is finished click on 'q';
6. the results are stored in the 'update/experiment' folder.

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email: simone.mutti@unibg.it