Using EoL Python Versions on Kali
In December of 2019 we released a blog post talking about how we will deal with Python 2's End-of-Life. Since then there has been quite a lot of tools that users use that have not been ported to Python 3, causing issues when they try to use them. This page will cover a way of using the depreciated version in a safe way.
Python 2 is no longer being maintained in the Debian repositories. This means that we must find a way to work around this issue.
pyenv solves this problem by allowing us to install multiple versions of Python that do not conflict with each other. Currently it is not in the Debian or Kali repository, so we will need to install it from source. Thankfully, there is a handy installation script that the authors have released. Let's go through the installation and setup together.
kali@kali:~$ sudo apt-get install -y build-essential libssl-dev zlib1g-dev libbz2-dev libreadline-dev libsqlite3-dev wget curl llvm libncurses5-dev libncursesw5-dev xz-utils tk-dev libffi-dev liblzma-dev python3-openssl git ... SNIP ... kali@kali:~$
We will next be quickly running the bash install script. If
ZSH is the default shell we will have to edit the
.zshrc file after this.
kali@kali:~$ curl https://pyenv.run | bash ... SNIP ... kali@kali:~$
If we are using
ZSH then we will now add the proper lines to our
echo 'export PYENV_ROOT="$HOME/.pyenv"' >> ~/.zshrc echo 'export PATH="$PYENV_ROOT/bin:$PATH"' >> ~/.zshrc echo -e 'if command -v pyenv 1>/dev/null 2>&1; then\n eval "$(pyenv init -)"\nfi' >> ~/.zshrc
Lets continue with the setup
kali@kali:~$ exec $SHELL kali@kali:~$ kali@kali:~$ pyenv pyenv 1.2.20 Usage: pyenv <command> [<args>] Some useful pyenv commands are: activate Activate virtual environment commands List all available pyenv commands deactivate Deactivate virtual environment doctor Verify pyenv installation and development tools to build pythons. exec Run an executable with the selected Python version global Set or show the global Python version(s) help Display help for a command hooks List hook scripts for a given pyenv command init Configure the shell environment for pyenv install Install a Python version using python-build local Set or show the local application-specific Python version(s) prefix Display prefix for a Python version rehash Rehash pyenv shims (run this after installing executables) root Display the root directory where versions and shims are kept shell Set or show the shell-specific Python version shims List existing pyenv shims uninstall Uninstall a specific Python version --version Display the version of pyenv version Show the current Python version(s) and its origin version-file Detect the file that sets the current pyenv version version-name Show the current Python version version-origin Explain how the current Python version is set versions List all Python versions available to pyenv virtualenv Create a Python virtualenv using the pyenv-virtualenv plugin virtualenv-delete Uninstall a specific Python virtualenv virtualenv-init Configure the shell environment for pyenv-virtualenv virtualenv-prefix Display real_prefix for a Python virtualenv version virtualenvs List all Python virtualenvs found in `$PYENV_ROOT/versions/*'. whence List all Python versions that contain the given executable which Display the full path to an executable See `pyenv help <command>' for information on a specific command. For full documentation, see: https://github.com/pyenv/pyenv#readme kali@kali:~$
We can now install Python 2 and set it as our default Python version:
kali@kali:~$ pyenv install 2.7.18 Downloading Python-2.7.18.tar.xz... -> https://www.python.org/ftp/python/2.7.18/Python-2.7.18.tar.xz Installing Python-2.7.18... Installed Python-2.7.18 to /home/kali/.pyenv/versions/2.7.18 kali@kali:~$ kali@kali:~$ pyenv global 2.7.18 kali@kali:~$ kali@kali:~$ pyenv versions system * 2.7.18 (set by /home/kali/.pyenv/version) kali@kali:~$ kali@kali:~$ python Python 2.7.18 (default, Apr 20 2020, 20:30:41) [GCC 9.3.0] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> kali@kali:~$
We can now install dependencies as needed for whatever tools we are using. When we want to swap back to Python 3, we just need to set the global to be system.
One thing to keep in mind is to stick with installing the dependencies via
apt will not be very kind if you are trying to install Python 2 dependencies through it and through pip, so just stick with pip in this case.
Updated on: 2020-Sep-02