#!/usr/bin/env python """Helps a client to join domain and maintain itself.""" __author__ = 'Enrico Bacis' __email__ = 'enrico.bacis@gmail.com' from contextlib import contextmanager, closing from subprocess import Popen, PIPE from sqlite3 import connect from bottle import Bottle, request from json import dumps from ConfigParser import ConfigParser from Crypto.Hash import MD5 from Crypto.Cipher import AES import base64 import re import os import sys class MyApp: def __init__(self, configfile = '/etc/mac2hostname.ini'): if not os.path.isfile(configfile): print "Cannot find main file, %s. Exiting." % configfile sys.exit(1) # Loads configurations config = ConfigParser() config.read(configfile) # Populates private properties with configuration self.__dbfile = config.get('Daemon', 'Database') if config.has_option('Daemon', 'Database') else '/var/lib/doraemon/doraemon.db' self.__logdir = config.get('Daemon', 'LogFile') if config.has_option('Daemon', 'LogFile') else '/var/log/doraemon.log' self.__pidfile = config.get('Daemon', 'PIDFile') if config.has_option('Daemon', 'PIDFile') else '/var/run/doraemon.pid' self.__bindaddress = config.get('Daemon', 'BindAddress') if config.has_option('Daemon', 'BindAddress') else '127.0.0.1' self.__port = config.getint('Daemon', 'Port') if config.has_option('Daemon', 'Port') else 8080 self.__defaultbase = config.get('NameSettings', 'Base') if config.has_option('NameSettings', 'Base') else 'client' self.__defaultrole = config.get('NameSettings', 'Role') if config.has_option('NameSettings', 'Role') else 'client' self.__namedigits = config.get('NameSettings', 'Digits') if config.has_option('NameSettings', 'Digits') else '2' self.__domainfile = config.get('Files', 'Domain') if config.has_option('Files', 'Domain') else None self.__mgmtfile = config.get('Files', 'MgmtKey') if config.has_option('Files', 'MgmtKey') else None self.__vaultpassfile = config.get('Files', 'VaultPassFile') if config.has_option('Files', 'VaultPassFile') else None self.__app = Bottle() # Applies routes self.__route() # Assures table creation self.__init_tables() # Private methods def __route(self): self.__app.get('/mac2hostname', callback=self.mac2hostname) self.__app.get('/whatsmyhostname', callback=self.whatsmyhostname) self.__app.get('/hosts', callback=self.hosts) self.__app.get('/domain', callback=self.domain) self.__app.get('/mgmtkey', callback=self.mgmtkey) self.__app.get('/vaultpass', callback=self.vaultpass) def __init_tables(self): with self.__getcursor() as cursor: cursor.execute('CREATE TABLE IF NOT EXISTS client (id INT PRIMARY KEY,' 'hostname TEXT NOT NULL UNIQUE, mac TEXT UNIQUE, role TEXT)') cursor.execute('CREATE INDEX IF NOT EXISTS idxmac ON client(mac)') def __getmac(self, ip): Popen(['ping', '-c1', '-t2', ip], stdout=PIPE).communicate() arp = Popen(['arp', '-n', ip], stdout=PIPE).communicate()[0] return re.search(r'(([\da-fA-F]{1,2}\:){5}[\da-fA-F]{1,2})', arp).group(1).lower() def __normalizemac(self, mac): return ':'.join(x.zfill(2) for x in mac.split('_')).lower() def __gethostname(self, mac): # At this point, the mac is set. with self.__getcursor() as cursor: (newid,) = cursor.execute('SELECT COALESCE(MAX(id) + 1, 1) FROM client').fetchone() # Constucts the hostname format formatstring = '%s-%0' + self.__namedigits + 'd' data = (newid, formatstring % (self.__defaultbase, newid), mac, self.__role) # Since MAC is Unique, this fails with the same MAC address cursor.execute('INSERT OR IGNORE INTO client VALUES (?, ?, ?, ?)', data) (hostname,) = cursor.execute('SELECT hostname FROM client WHERE mac = "%s"' % mac).fetchone() return hostname @contextmanager def __getcursor(self): with connect(self.__dbfile) as connection: with closing(connection.cursor()) as cursor: yield cursor # Instance methods AKA routes def mac2hostname(self): # Ensure required parameters have been passed if not request.query.mac: return "Usage: GET /mac2hostname?mac=XX_XX_XX_XX_XX_XX[&base=YYY][&role=ZZZ]" # Sets up variables for possible parameters mac = self.__normalizemac(request.query.mac) self.__base = request.query.base or self.__defaultbase self.__role = request.query.role or self.__defaultrole return self.__gethostname(mac) def whatsmyhostname(self): # No required parameters ip = request.query.ip or request['REMOTE_ADDR'] self.__role = request.query.role or self.__defaultrole return self.__gethostname(self.__getmac(ip)) def hosts(self): # Default where clause: no where specifications where = '' # If a role parameter is passed, list the hosts for that role if request.query.role: where = "WHERE role = '%s'" % request.query.role with self.__getcursor() as cursor: return dumps([dict((meta[0], data) for meta, data in zip(cursor.description, row)) for row in cursor.execute('SELECT role, hostname, mac FROM client ' + where + 'ORDER BY role ASC, hostname ASC')], indent=4) def domain(self): with open(self.__domainfile, 'r') as f: return f.read() def mgmtkey(self): with open(self.__mgmtfile, 'r') as f: return f.read() def vaultpass(self): with open(self.__vaultpassfile) as f: ip = request.query.ip or request['REMOTE_ADDR'] hostname = self.__gethostname(self.__getmac(ip)) # Chiave key = MD5.new(hostname).digest() # Segreto da crittare secret = f.read().strip() # Rendo il segreto lungo un multiplo di 16 byte i = 16 - (len(secret) % 16) lenghty_secret = secret + i * 'x' cipher = AES.new(key, AES.MODE_ECB) crypted = cipher.encrypt(lenghty_secret) # Devo ritornare un base64 perché la stringa criptata è UTF-8 e non è # sempre visibile. return base64.b64encode(crypted) def start(self): # Opens up a PID file pid = os.getpid() pidfile = open(self.__pidfile, 'w') pidfile.write('%s' % pid) pidfile.close() # Runs Bottle, at last. self.__app.run(host=self.__bindaddress, port=self.__port) # Main body if __name__ == '__main__': cfgfile = '/etc/mac2hostname.ini' if len(sys.argv) > 1: cfgfile = sys.argv[1] app = MyApp(cfgfile) app.start()