doraemon/doraemon.py

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#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""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()
@contextmanager
def __getcursor(self):
with connect(self.__dbfile) as connection:
with closing(connection.cursor()) as cursor:
yield cursor
# 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)
self.__app.get('/ansible_list', callback=self.ansible_list)
self.__app.get('/ansible_host', callback=self.ansible_host)
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, base = None, role = None):
if base == None:
base = self.__defaultbase
if role == None:
role = self.__defaultrole
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 % (base, newid), mac, 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
# This should be used only after registration of the client
# (whatsmyhostname)
def __getrole(self):
macaddress = self.__normalizemac(self.__getmac(request['REMOTE_ADDR']))
hostname = self.__gethostname(macaddress)
with self.__getcursor() as cursor:
(role,) = cursor.execute("SELECT role FROM client WHERE hostname = '%s' AND mac = '%s'" % (hostname, macaddress)).fetchone()
return role
# Mocks up variables to be returned.
# When will be ready Enrico's work on the interface, this should be simpler
# to implement.
def __rolevars(self, role=None):
retval = {}
if role == 'client':
retval = {
'role': role,
'addpkg': [ 'gimp' ],
'delpkg': []
}
elif role == 'docente':
retval = {
'role': role,
'addpkg': [],
'delpkg': []
}
return retval
# 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)
base = request.query.base or self.__defaultbase
role = request.query.role or self.__defaultrole
return self.__gethostname(mac, base, role)
def whatsmyhostname(self):
# No required parameters
ip = request.query.ip or request['REMOTE_ADDR']
base = request.query.base or self.__defaultbase
role = request.query.role or self.__defaultrole
return self.__gethostname(self.__getmac(ip), base, role)
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, 'r') as f:
ip = request.query.ip or request['REMOTE_ADDR']
base = request.query.base or self.__defaultbase
role = request.query.role or self.__defaultrole
hostname = self.__gethostname(self.__getmac(ip), base, role)
# Encryption key
key = MD5.new(hostname).digest()
# Secret
secret = f.read().strip()
# Creating a secret that is multiple of 16 in length
i = 16 - (len(secret) % 16)
lengthy_secret = secret + i * 'x'
cipher = AES.new(key, AES.MODE_ECB)
crypted = cipher.encrypt(lengthy_secret)
# Encode in base64 because of unicode strings
return base64.b64encode(crypted)
def ansible_list(self):
# Faking calls
if request.query.role:
role = request.query.role
else:
role = self.__getrole()
result = {
'localhost': {
'hosts': [ 'localhost' ],
'vars': {
'ansible_connection': 'local'
}
},
'_meta': {
'hostvars': {
'localhost': self.__rolevars(role)
}
}
}
return dumps(result)
def ansible_host(self):
# Ignoring 'host' parameter, since it should always be 'localhost'.
# Instead, for testing purposes, if asked for a role, use it
if request.query.role:
role = request.query.role
else:
role = self.__getrole()
return dumps(self.__rolevars(role))
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/doraemon.ini'
if len(sys.argv) > 1:
cfgfile = sys.argv[1]
app = MyApp(cfgfile)
app.start()