A python script to automate otp in openvpn sessions

home-office.py

#!/usr/bin/env python3

import sys

# https://github.com/tadeck/onetimepass
import onetimepass as otp

# https://github.com/pexpect/pexpect
import pexpect

secret = open('.home-office.secret', 'r').read().strip()
code = str(otp.get_totp(secret)).zfill(6)

conn = pexpect.spawn('sudo openvpn --config home-office.ovpn --auth-retry interact')
conn.logfile = sys.stdout.buffer
conn.expect('CHALLENGE')
conn.delaybeforesend = 1
conn.sendline(code)
conn.expect('Initialization Sequence Completed')
print("Escape character is '^]'.\n")
sys.stdout.buffer.write(conn.after)
sys.stdout.buffer.flush()
conn.interact()