Adds the certificate/private key from a OpenVPN user to the configuration file (ovpn).

create_ovpn_config.py

#!/usr/bin/env python
import re
import os
import string
import argparse

def get_cert_from_file(regex, filename):
    try:
        cert_file = open(filename)
        cert_content = cert_file.read()
        search_result = re.search(regex, cert_content)

        if search_result is None:
            print "Unable to locate certificate/key in " + filename
            exit(2)

        return search_result.group(0)

    except:
        print "Problem with file: " + filename


# ------ main -------
parser = argparse.ArgumentParser()
parser.add_argument("template", help="The OpenVPN configuration template")
parser.add_argument("cafile", help="The server certificate")
parser.add_argument("certfile", help="The client certificate")
parser.add_argument("keyfile", help="The private key of the client")
parser.add_argument("ovpnfile", help="The name of the created openvpn file")

arguments = parser.parse_args()

try:
    template_file = open(arguments.template)
    template = template_file.read()
except:
    print "Error opening template file"
    exit(1)

cert_regex = re.compile(ur'(-----BEGIN CERTIFICATE-----.*-----END CERTIFICATE-----)', re.DOTALL)
key_regex = re.compile(ur'(-----BEGIN PRIVATE KEY-----.*-----END PRIVATE KEY-----)', re.DOTALL)
ca_cert = get_cert_from_file(cert_regex, arguments.cafile)
client_cert = get_cert_from_file(cert_regex, arguments.certfile)
client_key = get_cert_from_file(key_regex, arguments.keyfile)

try:
    ovpn_file = open(arguments.ovpnfile, "w")
except:
    print "Error opening ovpn file"
    exit(1)

ovpn_file.write(template)
ovpn_file.write("\n<ca>\n")
ovpn_file.write(ca_cert)
ovpn_file.write("\n</ca>\n")
ovpn_file.write("<cert>\n")
ovpn_file.write(client_cert)
ovpn_file.write("\n</cert>\n")
ovpn_file.write("<key>\n")
ovpn_file.write(client_key)
ovpn_file.write("\n</key>\n")