MyAuth Login Daemon

myauth_login.py

#!/usr/bin/env python
# -*- encoding: utf-8 -*-
#
# This used to be useful in a time when Altamira-Brazil had only Wireless ISPs
# which were connected to the Internet through VSAT links. The only WISP at
# the time which was stable enough for a small commercial link used to employ
# as its authentication method a captive portal from a product named MyAuth,
# which they acquired from a third party. This was a script to keep it always
# logged in.
#
# I doubt someone is still using this version of MyAuth, but anyway, uploading
# it here for historical purposes :)
#
#
# myauth login
# Copyright (c) 2009 Paulo Matias
#
# Permission to use, copy, modify, and/or distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
# 

import urllib, re, md5, time, traceback, os, sys

def login():
    # configurações
    url = 'http://200.241.244.4:1881/?myauth3'
    usuario = 'usuario'
    senha   = 'senha'
    #
    
    cnx = urllib.urlopen(url)
    response = cnx.read()
    cnx.close()
    
    if 'logout' in response:
        return 'Já estava logado'
    elif 'CHALLENGE' in response:
        challenge = re.search(r'CHALLENGE\s*=\s*"([^"]+)"', response).group(1)
        request = { 'username': usuario,
                    'password': md5.md5(senha + challenge).hexdigest(),
                    'action': 'auth',
                    'authtype': 'chap',
                    'popup': 'true',
                    'save': '0' }
        cnx = urllib.urlopen(url, urllib.urlencode(request))
        response = cnx.read()
        cnx.close()
        
        if 'Erro' in response:
            return re.search(r'Erro:<br><b>([^<]+)</b>', response).group(1)    
        return 'Login efetuado'
    
    return 'Status desconhecido'
        

def main():
    # drop privileges
    try: os.setuid(99)  # nobody
    except: print("Couldn't drop privileges.")
    
    # detach
    pid = os.fork()
    if pid != 0:
        print('Starting at pid %d.' % pid)
        sys.exit(0)
    os.setsid()
    os.close(0)
    os.close(1)
    os.close(2)
    
    # loop
    while True:
        try:    status = login()
        except: status = traceback.format_exc()
        
        f = open('/var/log/myauth/myauth.log', 'a')
        f.write('%s: %s\n' % (time.strftime('%a, %d %b %Y %H:%M:%S %z'), status))
        f.close()
        
        time.sleep(600)
        
        
if __name__ == '__main__':
    main()