Python OpenVPN Client

This package allows an OpenVPN connection to be established seamlessly given a config.ovpn file and then later be disconnected when instructed to. The functionality is tested to work on macOS and Linux (images: macOS-latest and ubuntu-24.04).

Note: Testing requires openvpn >= 2.6 since the used peer-fingerprint feature was first introduced then.

Authors

• Ludvig Larsson - lular@kth.se
• Nikolaos Kakouros - nkak@kth.se
• Benjamin Kelley - bekelley@kth.se

Command line usage

# connect
python3 -m openvpnclient --config=path/to/ovpn/config

# disconnect
python3 -m openvpnclient --disconnect

Usage in code

from openvpnclient import OpenVPNClient

# manually connect and disconnect
vpn = OpenVPNClient(ovpn_file)
vpn.connect()
# interact with network
vpn.disconnect()

# utilize context handler
with OpenVPNClient(ovpn_file):
    # interact with network

Contributing

Create virtual environment and install dependencies:

python3 -m venv venv
source venv/bin/activate
pip install -r prod-requirements.txt

After making changes, make sure the tests pass:

pip install -r test-requirements.txt
pytest tests/test_openvpnclient.py -s -v

Create a PR from the feature branch with the incorporated changes.

Test cases

1. Manually connect and disconnect the OpenVPN client
2. Use context manager to connect and disconnect the OpenVPN client
3. Disconnect client on SIGINT (ctrl+c)
4. Disconnect when not connected
5. Connect when already connected
6. Invalid configuration syntax
7. Unreachable server
8. Invalid path to ovpn config file
9. Connection attempt timeout

An autouse fixture (await_openvpn_cleanup) forces a delay between all tests. Given the rapid closing and opening of the same socket, this timeout can be adjusted to make sure the socket is ready for subsequent test.