USB Armory
Introduction
Launched in 2014, USB Armory is a small and portable USB-sized personal computer created by Andrea Barisani [1]. Originally intended to be produced as a secure data store, USB Armory became a versatile device used as a full-scale computer for developing, running different applications, storing information safely, and testing security. With its hardware sufficient as a computer, it can be configured on an installed Linux system that boots and thus powers up when plugged into any computer, for example, so that data not only ends up on an encrypted partition but is automatically re-encrypted when transferred [2] .
USB Armory MK I Hardware
- NXP i.MX53 ARM® Cortex™-A8 800MHz, 512MB DDR3 RAM
- USB host powered (<500 mA) device with compact form factor (65 x 19 x 6 mm)
- ARM® TrustZone®, secure boot + storage + RAM
- microSD card slot
- 5-pin breakout header with GPIOs and UART
- customizable LED, including secure mode detection
- excellent native support (Android, Debian, Ubuntu, Arch Linux)
- USB device emulation (CDC Ethernet, mass storage, HID, etc.)
- Open Hardware & Software [4]
Software
- Native Linux support – creating boot images is easy
- Precompiled images are available for Debian 9 (Stretch) and Arch Linux, with more on the way
- USB device emulation (CDC Ethernet, mass storage, HID, etc.) [5]
How to connect
- HS USB 2.0 On-The-Go (OTG) with device emulation
- TCP/IP communication via CDC Ethernet emulation
- flash drive functionality via mass storage device emulation
- serial communication over USB or physical UART
- stand-alone mode with dedicated host adapter [6]
Scopes Of Application
- Hardware Security Module (HSM)
- File storage with advanced features such as automatic encryption, virus scanning, host authentication, and data self-destruct using Interlock.
- OpenSSH client and agent for untrusted hosts (kiosk).
- Router for end-to-end VPN tunneling, Tor.
- Password manager with an integrated web server using Armory Pass.
- Electronic wallet (e.g. pocket Bitcoin wallet) using Electrum Bitcoin wallet.
- Authentication token.
- Portable penetration testing platform.
- Low level USB security testing [7].
Getting Started
Boot Mechanisms
For USB Armory to work in a certain operating system, either the microSD card is inserted. [8]:
USB Armory has a valid Pre-Image file for each operating system on its own page. Optionally, booting can be done either manually or by downloading the appropriate file and flashing the microSD card (before it is inserted into the USB Armory) with balenaEtcher software.
Pre-image
You can find the following Pre-Image files at this link: https://github.com/f-secure-foundry/usbarmory/wiki/Available-images
flash the microSD
You can download the following software here: https://www.balena.io/etcher/ After downloading Balena, insert the MicroSD in the computer and flash the downloaded pre-image.
Insert the microSD
After flashing the microSD insert the microSD into USB Armory and after plugging it in, the USB Armory will start to blink twice every second.
Host communication
Since the booted microSD card is ready in the operating system, Host communication can be started [11]. On Linux devices or VM with Linux:
# look up the name of the USB virtual Ethernet interface which was created by the USB Armory ifconfig
# bring the USB virtual Ethernet interface up /sbin/ip link set usb0 up
# set the host IP address /sbin/ip addr add 10.0.0.2/24 dev usb0
# enable masquerading for outgoing connections towards wireless interface /sbin/iptables -t nat -A POSTROUTING -s 10.0.0.1/32 -o wlan0 -j MASQUERADE
# enable IP forwarding sudo sysctl -w net.ipv4.ip_forward=1
#connect to USB Armory via ssh - password: USB armory ssh usbarmory@10.0.0.1
Armory Pass
Armory Pass is a password manager for USB Armory, that function as a web-based password manager <ref. To configure it:
On The USB Armory:
1. Clone Armory Pass from:https://github.com/mweissbacher/armory-pass 2. Download Python2 since Armory Pass works only with Python2:
.) sudo apt install paython2
3. Install PIP:
.) curl https://bootstrap.pypa.io/pip/2.7/get-pip.py --output get- pip.py .) sudo python2 get-pip.py
4. Install Cherrypy:
.) pip install cherrypy
5. Install Websocket: Ws4py
.) git clone git@github.com:Lawouach/WebSocket-for-Python.git .) python2 setup.py install .) pip install ws4py .) easy_install ws4py
6. Edit the file "Background.js" by changing the IP address to 127.0.0.1. 7. Change the Permessions for the files "Background.js" and "manifest.js". 8. Add your Passwords to "Password_store.js". 9. Run "ws.py" and "secret.js" file will be created.
.) python2 ws.py
Locally
1. Clone Armory Pass from:https://github.com/mweissbacher/armory-pass
2. Download Google Chrome since Armory pass works only with chrome extension:
.) wget https://dl.google.com/linux/direct/google-chrome-stable_current_amd64.deb .) sudo apt install ./google-chrome-stable_current_amd64.deb .) sudo apt install google-chrome-stable
3. Create "secret.js" and copy the contents from the "secret.js" on the USB Armory and paste it into the locale "secret.js".
4. Edit the permissions locally as on the USB Armory.
5. Edit "Background.js" and add the IP address 10.0.0.1
6. Add Armory Pass Extension to Chrome.
Hardware Used
References
- Armory pass https://github.com/mweissbacher/armory-pass
- ↑ Andrea Barisani. Forging the USB armory, https://www.youtube.com/watch?v=bE5licRHMFs,2014.
- ↑ NXP Community, Introducing USB armory, an Open Source Hardware Freescale i.MX53 Dongle , https://community.nxp.com/t5/i-MX-Solutions-Knowledge-Base/Introducing-USB-armory-an-Open-Source-Hardware-Freescale-i-MX53/ta-p/1126823, 2014
- ↑ Inverse Path, OPEN SOURCE FLASH-DRIVE SIZED COMPUTER, https://inversepath.com/usbarmory_mark-one.html
- ↑ Inverse Path, Hardware, https://inversepath.com/usbarmory_mark-one.html
- ↑ Andrea Barisani, MK II Introduction, https://github.com/f-secure-foundry/usbarmory/wiki/Mk-II-Introduction#software
- ↑ Inverse Path, How to Connect, https://inversepath.com/usbarmory_mark-one.html
- ↑ Inverse Path, Applications, https://inversepath.com/usbarmory_mark-one.html
- ↑ Getting started, https://github.com/f-secure-foundry/usbarmory/wiki/Starting#getting-started
- ↑ Andrea Barisani, Available images, https://github.com/f-secure-foundry/usbarmory/wiki/Available-images
- ↑ balenaEtcher, https://www.balena.io/etcher/
- ↑ Andrea Barisani, Setup & Connection Sharing: Linux , https://github.com/f-secure-foundry/usbarmory/wiki/Host-communication#setup--connection-sharing-linux