Open-TEE project

This repository contains the overall configuration for the Open-TEE project and the associated documentation.

• Overview
• Community
• Setup
  • Prerequisites
  • Obtaining the Source
  • Building using Autotools
  • Configuration
  • Running and Debugging
• Options
  • Command Line Option
  • Environmental Variables
• FAQ
• Contact
• License

Overview

The goal of the Open-TEE open source project is to implement a "virtual TEE" compliant with the recent Global Platform TEE specifications .

Our primary motivation for the virtual TEE is to use it as a tool for developers of Trusted Applications and researchers interested in using TEEs or building new protocols and systems on top of it. Although hardware-based TEEs are ubiquitous in smartphones and tablets ordinary developers and researchers do not have access to it. While the emerging Global Platform specifications may change this situation in the future, a fully functional virtual TEE can help developers and researchers right away.

We intend that Trusted Applications developed using our virtual TEE can be compiled and run for any target that complies with the specifications.

The Open-TEE project is being led by the Secure Systems group as part of our activities at the Intel Collaborative Research Institute for Secure Computing

All activities of the project are public and all results are in the public domain. We welcome anyone interested to join us in contributing to the project.

Quickstart guide

A minimalistic guide is tested on Ubuntu 20.04 (Focal Fossa). If you run into any errors or need more information, see topics below or raise an issue.

NOTE: We have also a docker envronment!

  # prerequisite packages
  $ sudo apt-get install -y build-essential git pkg-config uuid-dev libelf-dev wget curl autoconf automake libtool libfuse-dev

  # Google repo (skip if you already have it)
  $ mkdir -p ~/bin
  $ curl http://commondatastorage.googleapis.com/git-repo-downloads/repo > ~/bin/repo
  $ chmod +x ~/bin/repo
 
  # mbedtls 3.1.0: fetch, compile and install
  # (Note: Tested with 3.1.0, but 3.x.x version should be sufficient)
  # (Note: Currently Apt package contains 2.x.x version)
  # (NOTE: If you already have installed mbedtls, update with your own risk and cautions!!)
  $ wget https://github.com/ARMmbed/mbedtls/archive/refs/tags/v3.1.0.tar.gz
  $ tar -xf v3.1.0.tar.gz && cd mbedtls-3.1.0
  $ cmake -DUSE_SHARED_MBEDTLS_LIBRARY=On .
  $ make -j && make install
  
  # Clone opentee
  $ mkdir opentee && cd opentee
  $ ~/bin/repo init -u https://github.com/Open-TEE/manifest.git
  $ ~/bin/repo sync -j10
  
  # Build opentee and install (cd into opentee source folder)
  # Note: Install location is "/opt/OpenTee"
  $ mkdir build && cd build
  $ ../autogen.sh
  $ make -j && sudo make install
  
  # Generate opentee conf
  $ sudo echo -e "[PATHS]\nta_dir_path = /opt/OpenTee/lib/TAs\ncore_lib_path = /opt/OpenTee/lib\nsubprocess_manager = libManagerApi.so\nsubprocess_launcher = libLauncherApi.so" > /etc/opentee.conf
  
  # Run opentee and connection test program
  # /opt/OpenTee/bin/opentee
  # /opt/OpenTee/bin/conn_test

Docker

Docker environment tested on Ubuntu 20.04 (Focal Fossa) and Community docker engine 20.10.12. If you run on other platforms then you might need to adjust docker volumes. Please see tips for streamlining your development/usage

Basic usage

 # Prerequisite: Clone opentee source code
 # Please see quickstart guide points
 # 1. Google repo (skip if you already have it)
 # 2. Clone opentee
 
 # Run Docker
 $ cd docker
 $ ./build-docker.sh
 $ ./run-docker.sh
 
 # Inside docker: Compile and run opentee
 # Please see quickrstart guide points
 # 1. Build opentee and install
 # 2. Run opentee and connection test program

Docker environment tips

a) OpenTEE prints its debug prints to syslog and therefore /dev/log 
   is mounted. You can read logs from your host machine
b) You can pass "--prefix="-option to autogen.sh and you can 
   avoid sudo-location installation!
c) Remember to change /etc/opentee.conf file paths if you are 
   using "--prefix="-option
d) Dockers "--ipc=host"-options allows to connect from outside to 
   inside container. So you can run opentee deamon inside docker 
   and your CA can connect it from outside docker container

Setup

This guide describes how to obtain and build Open-TEE from source on Ubuntu 14.04 LTS (Trusty Tahr). We currently support building Open-TEE using Autotools.

If you simply wish to build Open-TEE using the suggested configuration, you can also follow the tutorial at:

http://open-tee.github.io/documentation/

If you wish to build Open-TEE for Android, consult the Android specific build documentation at:

http://open-tee.github.io/android

Prerequisites

Open-TEE uses the Android repo tool to manage the Git repositories that contain the source code. What follows are step-by-step instructions for setting up the build environment for Open-TEE. Full documentation for repo is available at https://source.android.com/source/using-repo.html

You'll also need to install git, curl, pkg-config and the necessary build dependencies:

$ sudo apt-get install git curl pkg-config build-essential uuid-dev libssl-dev libglu1-mesa-dev libelfg0-dev mesa-common-dev libfuse-dev

Introduce yourself to git if you haven't done so already:

$ git config --global user.name "Firstname Lastname"
$ git config --global user.email "[email protected]"

Installing Repo

Fetch the repo repository management tool:

$ mkdir -p ~/bin
$ curl http://commondatastorage.googleapis.com/git-repo-downloads/repo > ~/bin/repo
$ chmod +x ~/bin/repo

Installing Autotools

The Autotools build has been tested with Autoconfig 2.69 and above. To perform an Autotools build you need to install autoconf, automake and libtool:

$ sudo apt-get install autoconf automake libtool

Obtaining the Source

Create a directory where the repositories are to be cloned:

$ mkdir Open-TEE
$ cd Open-TEE

Have repo fetch the manifest for the Open-TEE project:

$ ~/bin/repo init -u https://github.com/Open-TEE/manifest.git

Those wishing to contribute to Open-TEE need signup to the GerritHub Code Review tool (requires a GitHub account) and initialize repo using the the developer configuration:

$ ~/bin/repo init -u https://github.com/Open-TEE/manifest.git -m developer.xml

To submit changes to GerritHub you'll also need to add the following to your ~/.ssh/config:

host review.gerrithub.io
port 29418
user

Have repo fetch the repositories defined in the manifests:

$ ~/bin/repo sync -j10

Once cloned, you can work on the repositories in a normal git fashion. Developers wishing to contribute can push changes ro Gerrit for review using the following command:

$ git push origin HEAD:refs/for/master

Building using Autotools

We recommend using a parallel build tree (a.k.a. VPATH build):

$ mkdir build

The provided autogen.sh script will generate and run the configure script.

$ cd build
$ ../autogen.sh

To build and install Open-TEE run:

$ make
$ sudo make install

By default Open-TEE will be installed under /opt/Open-TEE. The directory will contain the following subdirectories:

• /opt/Open-TEE/bin - executables

• /opt/Open-TEE/include - public header files

• /opt/Open-TEE/lib - shared library objects (libdir)

• /opt/Open-TEE/lib/TAs - trusted application objects (tadir)

Configuration

Open the configuration file with your preferred editor:

$ sudo $EDITOR /etc/opentee.conf

Add the sample configuration given below to the configuration file:

[PATHS]
ta_dir_path = PATH/TO/TADIR
core_lib_path = PATH/TO/LIBDIR
subprocess_manager = libManagerApi.so
subprocess_launcher = libLauncherApi.so

where PATHNAME is replaced with the absolute path to the parent directory of the Open-TEE directory you created earlier. The pathname must not include special variables such as ~ or $HOME.

For an autotools build you can use

[PATHS]
ta_dir_path = /opt/OpenTee/lib/TAs
core_lib_path = /opt/OpenTee/lib
subprocess_manager = libManagerApi.so
subprocess_launcher = libLauncherApi.so

Running and Debugging

You are now ready to launch the opentee-engine.

For an autotools build:

$ /opt/Open-TEE/bin/opentee-engine

Verify that Open-TEE is running with ps:

$ ps waux | grep tee

You should see output similar to the example below:

gcc-debug$ ps waux |grep tee
brian 5738 0.0 0.0 97176 852 ? Sl 10:40 0:00 tee_manager
brian 5739 0.0 0.0 25216 1144 ? S 10:40 0:00 tee_launcher

Now launch and attach gdb to the tee_launcher process:

$ gdb -ex "set follow-fork-mode child" opentee-engine $(pidof tee_launcher)

The set follow-fork-mode child command passed to gdb on the command line causes gdb to follow children processes across forks in order to drop into the TA process itself and resume execution.

In second terminal run the client application:

$ /opt/Open-TEE/bin/conn_test_app

You should now expect to see output similar to the following:

./conn_test_app
START: conn test app
Initializing context:

Back in gdb you can now step through and debug the trusted application the conn_test_app is connected to. If you continue execution you should see output from the conn_test_app similar to the following:

gcc-debug$ ./conn_test_app
START: conn test app
Initializing context: initialized
Openning session: opened
yyyyyyyyyyyyyyyyyyyyxxxxx
Invoking command: invoked
Closing session: Closed
Finalizing ctx: Finalized
END: conn test app

Options

Command Line Options

The opentee-engine executable supports the following command line options:

Usage: ./bin/opentee-engine [OPTION...]

• -p, --pid-dir=PATH
  Specify path to keep pid file.
  Defaults to:

  • /var/run/opentee when run by root, or
  • /tmp/opentee when run by a non-root user.

• -c, --config=FILE
  Specify path to configuration file.
  Defaults to: /etc/opentee.conf

• -f, --foreground
  Do not daemonize but start the process in foreground.

• -h, --help
  Print list of command line options.

Environmental Variables

The following environmental variables control the behaviour of Open-TEE:

• OPENTEE_SOCKET_FILE_PATH
  Defines path to socket used for communication between tee_manager and libtee.
  Defaults to /tmp/open_tee_sock on Linux
  Defaults to /data/local/tmp/open_tee_sock on Android

• OPENTEE_STORAGE_PATH
  Defines directory used for object storage.
  Defaults to $HOME/.TEE_secure_storage on Linux
  Defaults to /data on Android

FAQ

If you get the following error when trying to attach gdb to tee_launcher:

Could not attach to process. If your uid matches the uid of the target
process, check the setting of /proc/sys/kernel/yama/ptrace_scope, or try
again as the root user. For more details, see /etc/sysctl.d/10-ptrace.conf
ptrace: Operation not permitted.

Run the following command and invoke gdb again:

$ echo 0 | sudo tee /proc/sys/kernel/yama/ptrace_scope 

Contact

Bug reports and other issues:

• https://github.com/Open-TEE/project/issues

License

Open-TEE is licensed under the Apache License 2.0 (see LICENSE).