5f3bb44c7b
statusdaten werden jetzt mit den funktionen encode() und decode() verarbeitet, antwort des servers als variable, finaly klausel wieder entfernt
245 lines
8.1 KiB
Python
Executable file
245 lines
8.1 KiB
Python
Executable file
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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# file: setstatus.py
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# date: 26.07.2019
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# email: berhsi@web.de
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# Setstatus.py is part of doorstatus - a programm to deal with the
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# krautspaces doorstatus.
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# client, who connects to the statusserver at port 10001 to update the
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# krautspace door status. If no status is given as argument, he reads from
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# stdin until input is 0 or 1.
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import os
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import ssl
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import socket
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import logging
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import configparser
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from time import sleep
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from sys import exit, argv
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# basic configuration
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loglevel = logging.WARNING
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formatstring = '%(asctime)s: %(levelname)s: %(message)s'
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logging.basicConfig(format=formatstring, level=loglevel)
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class SetStatus:
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def __init__(self):
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"""
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"""
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self.status = None
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self.config = None
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self.log = None
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self.context = None
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self.connection = None
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self.configfile = './setstatus.conf'
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self.config = configparser.ConfigParser()
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self.default_config = {
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'general': {
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'timeout': 5.0,
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'loglevel': 'warning'
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},
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'server': {
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'host': 'localhost',
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'port': 10001,
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'cert': './certs/server-pub.pem',
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'fqdn': 'kraut.space'
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},
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'client': {
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'cert': './certs/client-pub.pem',
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'key': './certs/client-key.pem'
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}
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}
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def check_status(self):
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"""
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return: boolean
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"""
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if self.status in ('0', '1'):
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self.log.debug('Set status to {}'.format(self.status))
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return True
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self.log.debug('{} is not a valid status'.format(self.status))
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return False
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def set_config(self):
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"""
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"""
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self.log = logging.getLogger()
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# read config file
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self.config.read_dict(self.default_config)
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if not self.config.read(self.configfile):
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self.log.warning('Configuration file {} not found or not '
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' readable.'.format(self.configfile))
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self.log.warning('Using default values.')
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# set loglevel
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config_loglevel = self.config['general']['loglevel']
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default_loglevel = self.default_config['general']['loglevel']
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if not config_loglevel.lower() in ('critical', 'error','warning',
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'info', 'debug'):
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self.log.warning('Invalid loglevel {} given. Using default '
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'level {}.'.format(config_loglevel,
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default_loglevel))
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self.config.set('general', 'loglevel', default_loglevel)
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self.log.setLevel(config_loglevel.upper())
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def check_certs(self, certs):
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"""
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Check if certs readable.
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"""
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self.log.debug('Check certificates')
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for certfile in certs:
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if os.access(certfile, os.R_OK) is False:
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self.log.error('Failed to read certificate: {}'.format( \
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certfile))
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return False
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return True
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def log_config(self):
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"""
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Logs the config if loglevel is debug.
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"""
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logging.debug('Using config:')
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for section in self.config.sections():
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logging.debug('Section {}'.format(section))
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for i in self.config[section]:
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logging.debug(' {}: {}'.format(i, self.config[section][i]))
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def create_ssl_context(self):
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"""
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"""
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context = ssl.create_default_context(ssl.Purpose.SERVER_AUTH,
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cafile=self.config['server']['cert'])
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if not context:
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self.log.error('Failed to create SSL Context')
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return False
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context.set_ciphers('EECDH+AESGCM') # only ciphers for tls 1.2 and 1.3
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context.options |= getattr(ssl._ssl, 'OP_NO_COMPRESSION', 0)
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try:
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context.load_cert_chain(certfile=self.config['client']['cert'],
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keyfile=self.config['client']['key'])
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except Exception as e:
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self.log.error('Failed to load cert chain')
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return False;
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self.log.debug('SSL context created')
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return context
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def create_ssl_socket(self, config, context):
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"""
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"""
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bare_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM, 0)
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if not bare_socket:
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logging.error('Socket creation failed')
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return False
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logging.debug('Socket created')
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try:
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secure_socket = context.wrap_socket(bare_socket, server_side=False,
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server_hostname=config['server']['fqdn'])
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logging.debug('Socket wrapped with SSL')
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except Exception as e:
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logging.error('Context wrapper failed: {}'.format(e))
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return False
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try:
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secure_socket.settimeout(float(config['general']['timeout']))
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except Exception as e:
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logging.debug('Failed to set timeout: {}'.format(e))
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return secure_socket
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def create_ssl_connection(self):
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"""
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"""
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counter = 0
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conn = False
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while conn is False and counter < 5:
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ssl_socket = self.create_ssl_socket(self.config, self.context)
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if ssl_socket is False:
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exit(4)
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try:
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self.log.debug('Connect {}: {}'.format(self.config['server']['host'],
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int(self.config['server']['port'])))
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conn = ssl_socket.connect((self.config['server']['host'],
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int(self.config['server']['port'])))
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except socket.timeout:
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self.log.error('Connection timeout')
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ssl_socket.close()
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sleep(5)
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counter += 1
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except Exception as e:
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self.log.error('Connection failed: {}'.format(e))
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exit(5)
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self.log.debug('Conection established')
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self.log.debug('Peer certificate commonName: {}'.format(
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ssl_socket.getpeercert()['subject'][5][0][1]))
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self.log.debug('Peer certificate serialNumber: {}'.format(
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ssl_socket.getpeercert()['serialNumber']))
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return ssl_socket
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def run(self, status):
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"""
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starts the engine.
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param 1: integer
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"""
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self.status = status
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# read config
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self.set_config()
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# check given status
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if self.check_status() is False:
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exit(1)
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# log config if level is debug
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if self.config['general']['loglevel'].lower() == 'debug':
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self.log_config()
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# check certificates are readable
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certs = (self.config['server']['cert'],
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self.config['client']['cert'],
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self.config['client']['key'])
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if self.check_certs(certs) is False:
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exit(2)
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# create ssl context
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self.context = self.create_ssl_context()
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if self.context is False:
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exit(3)
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# get connection
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self.connection = self.create_ssl_connection()
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# send status
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try:
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self.log.debug('Send new status: {}'.format(self.status))
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self.connection.send(self.status.encode(encoding='utf-8',
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errors='strict'))
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except Exception as e:
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self.log.error('Error: {}'.format(e))
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exit(6)
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try:
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response = self.connection.recv(1).decode(encoding='utf-8',
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errors='strict')
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self.log.debug('Server returns: {}'.format(response))
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if response == self.status:
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self.log.info('Status sucessfull updated')
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else:
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self.log.error('Failed to update status')
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self.log.debug('Disconnect from server')
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except Exception as e:
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self.log.error('Error: {}'.format(e))
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exit(7)
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if __name__ == '__main__':
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s = SetStatus()
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if len(argv) < 2:
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log.error('Usage: setstatus.py <0|1>')
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exit(255)
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else:
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s.run(argv[1])
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