auth.py

#!/usr/bin/env python

import httplib, socket, sys, os

if len(sys.argv) != 2:
    print("The first argument should be the path of the file with the user credentials")
    sys.exit(2)

if not os.path.exists(sys.argv[1]):
    print("Unable to read the credential file")
    sys.exit(2)

lines = []
with open(sys.argv[1], "r") as fd:
    lines = fd.readlines()

    if len(lines) != 2:
        print("Invalid file")
        sys.exit(2)

username = lines[0].strip()
password = lines[1].strip()
tenant = "openvpn"

body = '{"auth": {"tenantName": "%s", "passwordCredentials": {"username": "%s", "password": "%s"}}}' % (tenant, username, password)

# do the request
try:
    conn = httplib.HTTPConnection("keystone.example.com", 5000)
    conn.request("POST", "/v2.0/tokens", body = body, headers = { 
        "Content-Type" : "application/json",
	"Accept" : "application/json",
	"User-Agent": "python-httplib"})
    
    r1 = conn.getresponse()
    if r1.status == 200:
        sys.exit(0)
except socket.error as e:
    print("Unable to connect to keystone")
    sys.exit(10)

print("Authentication to openstack failed.")
sys.exit(1)