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juniper-vpn.py
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juniper-vpn.py
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#!/usr/bin/python
# -*- coding: utf-8 -*-
import subprocess
import mechanize
import cookielib
import getpass
import sys
import os
import ssl
import argparse
import atexit
import signal
import ConfigParser
import time
import binascii
import hmac
import hashlib
import shlex
import tncc
import re
if hasattr(ssl, '_create_unverified_context'):
ssl._create_default_https_context = ssl._create_unverified_context
connection_process = None
"""
OATH code from https://github.com/bdauvergne/python-oath
Copyright 2010, Benjamin Dauvergne
* All rights reserved.
* Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.'''
"""
def truncated_value(h):
bytes = map(ord, h)
offset = bytes[-1] & 0xf
v = (bytes[offset] & 0x7f) << 24 | (bytes[offset+1] & 0xff) << 16 | \
(bytes[offset+2] & 0xff) << 8 | (bytes[offset+3] & 0xff)
return v
def dec(h,p):
v = truncated_value(h)
v = v % (10**p)
return '%0*d' % (p, v)
def int2beint64(i):
hex_counter = hex(long(i))[2:-1]
hex_counter = '0' * (16 - len(hex_counter)) + hex_counter
bin_counter = binascii.unhexlify(hex_counter)
return bin_counter
def hotp(key):
key = binascii.unhexlify(key)
counter = int2beint64(int(time.time()) / 30)
return dec(hmac.new(key, counter, hashlib.sha256).digest(), 6)
def force_url(host):
"If a string has no URI scheme, prepend https://"
return re.sub('^(?![^:]+://)', 'https://', host)
def host_only(url):
"Extract just the host part of the URI, assuming the URI is like https://hostname/..."
return re.sub('(^[^:]+://|/.*$)', '', url)
class juniper_vpn(object):
def __init__(self, args):
self.args = args
self.fixed_password = args.password is not None
self.last_connect = 0
self.br = mechanize.Browser()
self.cj = cookielib.LWPCookieJar()
self.br.set_cookiejar(self.cj)
# Browser options
self.br.set_handle_equiv(True)
self.br.set_handle_redirect(True)
self.br.set_handle_referer(True)
self.br.set_handle_robots(False)
# Follows refresh 0 but not hangs on refresh > 0
self.br.set_handle_refresh(mechanize._http.HTTPRefreshProcessor(),
max_time=1)
# Want debugging messages?
#self.br.set_debug_http(True)
#self.br.set_debug_redirects(True)
#self.br.set_debug_responses(True)
self.user_agent = 'Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.1) Gecko/2008071615 Fedora/3.0.1-1.fc9 Firefox/3.0.1'
self.br.addheaders = [('User-agent', self.user_agent)]
self.last_action = None
self.needs_2factor = False
self.key = None
self.pass_postfix = None
def find_cookie(self, name):
for cookie in self.cj:
if cookie.name == name:
return cookie
return None
def next_action(self):
if self.find_cookie('DSID'):
return 'connect'
for form in self.br.forms():
if form.name == 'frmLogin':
try:
form.find_control('sn-preauth-proceed') # Throws if not found
return 'preauth'
except mechanize.ControlNotFoundError:
return 'login'
elif form.name == 'frmDefender':
return 'key'
elif form.name == 'frmConfirmation':
return 'continue'
else:
raise Exception('Unknown form type:', form.name)
return 'tncc'
def run(self):
# Open landing page
url = force_url(self.args.host)
print "Connecting to", url
self.r = self.br.open(url)
while True:
action = self.next_action()
if action == 'tncc':
self.action_tncc()
elif action == 'preauth':
self.action_preauth()
elif action == 'login':
self.action_login()
elif action == 'key':
self.action_key()
elif action == 'continue':
self.action_continue()
elif action == 'connect':
self.action_connect()
self.last_action = action
def action_tncc(self):
# Run tncc host checker
dspreauth_cookie = self.find_cookie('DSPREAUTH')
if dspreauth_cookie is None:
raise Exception('Could not find DSPREAUTH key for host checker')
dssignin_cookie = self.find_cookie('DSSIGNIN')
t = tncc.tncc(host_only(self.args.host));
self.cj.set_cookie(t.get_cookie(dspreauth_cookie, dssignin_cookie))
self.r = self.br.open(self.r.geturl())
def action_preauth(self):
self.br.select_form(nr=0)
self.br.submit()
def action_login(self):
# The token used for two-factor is selected when this form is submitted.
# If we aren't getting a password, then get the key now, otherwise
# we could be sitting on the two factor key prompt later on waiting
# on the user.
if self.args.password is None or self.last_action == 'login':
if self.fixed_password:
print self.br
print 'Login failed (Invalid username or password?)'
sys.exit(1)
else:
self.args.password = getpass.getpass('Password:')
self.needs_2factor = False
if self.args.pass_prefix:
self.pass_postfix = getpass.getpass("Secondary password postfix:")
if self.needs_2factor:
if self.args.oath:
self.key = hotp(self.args.oath)
else:
self.key = getpass.getpass('Two-factor key:')
else:
self.key = None
# Enter username/password
self.br.select_form(nr=0)
self.br.form['username'] = self.args.username
self.br.form['password'] = self.args.password
if self.args.pass_prefix:
if self.pass_postfix:
secondary_password = "".join([ self.args.pass_prefix,
self.pass_postfix])
else:
print 'Secondary password postfix not provided'
sys.exit(1)
self.br.form['password#2'] = secondary_password
# Untested, a list of availables realms is provided when this
# is necessary.
# self.br.form['realm'] = [realm]
self.r = self.br.submit()
def action_key(self):
# Enter key
self.needs_2factor = True
if self.args.oath:
if self.last_action == 'key':
print 'Login failed (Invalid OATH key)'
sys.exit(1)
self.key = hotp(self.args.oath)
elif self.key is None:
self.key = getpass.getpass('Two-factor key:')
self.br.select_form(nr=0)
self.br.form['password'] = self.key
self.key = None
self.r = self.br.submit()
def action_continue(self):
# Yes, I want to terminate the existing connection
self.br.select_form(nr=0)
self.r = self.br.submit()
def action_connect(self):
now = time.time()
delay = 10.0 - (now - self.last_connect)
if delay > 0:
print 'Waiting %.0f...' % (delay)
time.sleep(delay)
self.last_connect = time.time();
dsid = self.find_cookie('DSID').value
action = []
for arg in self.args.action:
arg = arg.replace('%DSID%', dsid).replace('%HOST%', self.args.host)
action.append(arg)
connection_process = subprocess.Popen(action, stdin=subprocess.PIPE)
if args.stdin is not None:
stdin = args.stdin.replace('%DSID%', dsid)
stdin = stdin.replace('%HOST%', self.args.host)
connection_process.communicate(input = stdin)
else:
ret = connection_process.wait()
ret = connection_process.returncode
# Openconnect specific
if ret == 2:
self.cj.clear(self.args.host, '/', 'DSID')
self.r = self.br.open(self.r.geturl())
def cleanup():
if connection_process:
connection_process.send_signal(signal.SIGINT)
if __name__ == "__main__":
parser = argparse.ArgumentParser(conflict_handler='resolve')
parser.add_argument('-h', '--host', type=str,
help='VPN host name or URL')
parser.add_argument('-u', '--username', type=str,
help='User name')
parser.add_argument('-p', '--pass_prefix', type=str,
help="Secondary password prefix")
parser.add_argument('-o', '--oath', type=str,
help='OATH key for two factor authentication (hex)')
parser.add_argument('-c', '--config', type=str,
help='Config file')
parser.add_argument('-s', '--stdin', type=str,
help="String to pass to action's stdin")
parser.add_argument('action', nargs=argparse.REMAINDER,
metavar='<action> [<args...>]',
help='External command')
args = parser.parse_args()
args.__dict__['password'] = None
if len(args.action) and args.action[0] == '--':
args.action = args.action[1:]
if not len(args.action):
args.action = None
if args.config is not None:
config = ConfigParser.RawConfigParser()
config.read(args.config)
for arg in ['username', 'host', 'password', 'pass_prefix', 'oath', 'action', 'stdin']:
if args.__dict__[arg] is None:
try:
args.__dict__[arg] = config.get('vpn', arg)
except:
pass
if not isinstance(args.action, list):
args.action = shlex.split(args.action)
if args.username == None or args.host == None or args.action == []:
print "--user, --host, and <action> are required parameters"
sys.exit(1)
atexit.register(cleanup)
jvpn = juniper_vpn(args)
try:
jvpn.run()
except KeyboardInterrupt:
sys.exit(1)