diff --git a/provision.sh b/provision.sh
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index 0000000000000000000000000000000000000000..d571e04032f87b2a79067cc9a613d7c4a1dfb77e
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+++ b/provision.sh
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+#!/bin/bash
+#
+# Provisioning script for the Vagrant test environment. Do not run
+# outside of vagrant machine.
+#
+
+# Fail as soon as a command fails.
+set -e
+
+hostname=$(hostname)
+
+if [[ $hostname != "gimmecert-testing" ]]; then
+    echo "Script should only be run on Vagrant testing machine."
+    exit 1
+fi
+
+# Update apt caches.
+apt-get update -qq
+
+# Install development tools.
+apt-get install -qq -y git virtualenv
+
+# Install Python build dependencies.
+apt-get install -qq -y make build-essential libssl1.0-dev zlib1g-dev libbz2-dev libreadline-dev libsqlite3-dev wget curl llvm libncurses5-dev xz-utils tk-dev libxml2-dev libffi-dev
+
+# Clone the pyenv and pyenv-virtualenv tools for setting-up multiple
+# Python installations.
+if [[ ! -e /home/vagrant/.pyenv ]]; then
+    sudo -i -u vagrant git clone https://github.com/pyenv/pyenv/ /home/vagrant/.pyenv
+fi
+
+if [[ ! -e /home/vagrant/.pyenv/plugins/pyenv-virtualenv ]]; then
+    sudo -i -u vagrant git clone https://github.com/pyenv/pyenv-virtualenv.git /home/vagrant/.pyenv/plugins/pyenv-virtualenv
+fi
+
+# Enable pyenv for the user.
+bash_profile="/home/vagrant/.bash_profile"
+
+if [[ ! -e $bash_profile ]] || ! grep -q "export PYENV_ROOT" "$bash_profile"; then
+    echo 'export PYENV_ROOT="$HOME/.pyenv"' >> "$bash_profile"
+fi
+
+if [[ ! -e $bash_profile ]] || ! grep -q "export PATH=" "$bash_profile"; then
+    echo 'export PATH="$PYENV_ROOT/bin:$PATH"' >> "$bash_profile"
+fi
+
+if [[ ! -e $bash_profile ]] || ! grep -q 'pyenv init' "$bash_profile"; then
+    echo 'eval "$(pyenv init -)"' >> "$bash_profile"
+fi
+
+chown vagrant:vagrant "$bash_profile"
+chmod 0640 "$bash_profile"
+
+# List of Python versions to install.
+python_versions=("3.4.9" "3.5.6" "3.6.7" "3.7.1")
+
+# Install various Python versions.
+for python_version in "${python_versions[@]}"; do
+    sudo -i -u vagrant pyenv install -s "$python_version"
+done
+
+# Register them globally.
+sudo -i -u vagrant pyenv global system "${python_versions[@]}"
+
+# Set-up virtual environment for running tox.
+if [[ ! -f /home/vagrant/virtualenv-tox/bin/activate ]]; then
+    sudo -i -u vagrant virtualenv --prompt '(tox) ' -q -p /usr/bin/python3 /home/vagrant/virtualenv-tox
+fi
+
+if [[ ! -e $bash_profile ]] || ! grep -q "source /home/vagrant/virtualenv-tox/bin/activate" "$bash_profile"; then
+    echo 'source /home/vagrant/virtualenv-tox/bin/activate' >> "$bash_profile"
+fi
+
+# Install development requirements.
+sudo -i -u vagrant pip install -q -e "/vagrant[devel]"