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Server.py
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Server.py
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#!/usr/bin/python
# -*- coding: utf-8 -*-
#------------------------------------------------------------------------------#
# Security - Challenge Response Client / Server #
# ============================================================================ #
# Developer: Chavaillaz Johan #
# Filename: ChallengeResponseServer.py #
# Version: 1.0 #
# #
# Licensed to the Apache Software Foundation (ASF) under one #
# or more contributor license agreements. See the NOTICE file #
# distributed with this work for additional information #
# regarding copyright ownership. The ASF licenses this file #
# to you under the Apache License, Version 2.0 (the #
# "License"); you may not use this file except in compliance #
# with the License. You may obtain a copy of the License at #
# #
# http://www.apache.org/licenses/LICENSE-2.0 #
# #
# Unless required by applicable law or agreed to in writing, #
# software distributed under the License is distributed on an #
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY #
# KIND, either express or implied. See the License for the #
# specific language governing permissions and limitations #
# under the License. #
# #
#------------------------------------------------------------------------------#
#------------------------------------------------------------------------------#
# #
# LIBRARIES IMPORT #
# #
#------------------------------------------------------------------------------#
import socket
import sys
import threading
import argparse
import re
import uuid
import hashlib
from collections import OrderedDict
#------------------------------------------------------------------------------#
# #
# UTILITIES FUNCTIONS #
# #
#------------------------------------------------------------------------------#
def prepareString(content):
return bytes(content + "\n", 'UTF-8')
def getArguments(message):
return message.split(" ")[1:]
#------------------------------------------------------------------------------#
# #
# RESPONSE FUNCTIONS #
# #
#------------------------------------------------------------------------------#
def helloRequest(thread):
thread.send("MSG Hello from " + socket.gethostname())
def loginRequest(thread):
user = getArguments(thread.data['message'])[0]
if user in Database.user.keys():
thread.data['login'] = user
thread.data['token'] = str(uuid.uuid4())
thread.send("CHALLENGE " + thread.data['token'])
else:
thread.send("MSG Indicated user not found")
def challengeRequest(thread):
passwordMessage = thread.data['token'] \
+ Database.user[thread.data['login']]
hashObject = hashlib.sha512(passwordMessage.encode('UTF-8'))
hexDigest = hashObject.hexdigest()
# Get hash from received message
hashRequest = getArguments(thread.data['message'])[0]
# Test connection
if hexDigest == hashRequest:
thread.data['isLogged'] = True
thread.send("MSG Login success.")
else:
thread.send("MSG Login failure.")
# Reset token
thread.data['token'] = ""
def isLoggedRequest(thread):
if 'isLogged' in thread.data.keys():
thread.send("MSG You are logged in.")
else:
thread.send("MSG You are not logged in.")
def logoutRequest(thread):
if 'isLogged' in thread.data.keys():
del thread.data['isLogged']
thread.send("MSG You are now logged out.")
else:
thread.send("MSG You are not logged in.")
def closeConnectionRequest(thread):
thread.closeConnection = True
thread.send("CLOSE CONFIRM")
def notFoundRequest(thread):
thread.send("MSG Command not found")
#------------------------------------------------------------------------------#
# #
# CLASSES #
# #
#------------------------------------------------------------------------------#
class Database:
"""Contains data used in application"""
user = {}
@staticmethod
def load(databaseFile):
# Open database file
with open(databaseFile) as file:
# Read each line (format "user:password")
for line in file:
# Delete new line character and split
data = line.rstrip('\n').split(':')
if len(data) == 2:
Database.user[data[0]] = data[1]
class ThreadClient(threading.Thread):
"""Manage each client connection to the server in a new thread"""
functionArray = OrderedDict([
(r"HELLO", helloRequest),
(r"LOGIN .*", loginRequest),
(r"CHALLENGE .*", challengeRequest),
(r"IS_LOGGED", isLoggedRequest),
(r"LOGOUT", logoutRequest),
(r"CLOSE", closeConnectionRequest),
(r".*", notFoundRequest),
])
def __init__(self, connection):
threading.Thread.__init__(self)
self.connection = connection
self.closeConnection = False
self.data = {}
self.data['message'] = ""
print("%s connected" % self.getName())
def send(self, message):
print("%s -> %s" % (self.getName(), message))
self.connection.send(prepareString(message))
def run(self):
try:
while not self.closeConnection:
character = self.connection.recv(1)
if character == b'\n':
print("%s <- %s" % (self.getName(), self.data['message']))
for regex, function in ThreadClient.functionArray.items():
if re.match(regex, self.data['message']):
function(self)
break
self.data['message'] = ""
else:
self.data['message'] += character.decode('UTF-8')
except ConnectionResetError:
print("%s has reset connection" % self.getName())
# Close connection
self.connection.close()
del connectionList[self.getName()]
print("%s disconnected" % self.getName())
#------------------------------------------------------------------------------#
# #
# "MAIN" FUNCTION #
# #
#------------------------------------------------------------------------------#
# If this is the main module, run this
if __name__ == '__main__':
argsCount = len(sys.argv)
# Create argument parser to help user
parser = argparse.ArgumentParser(
description='Server instance for challenge response application.'
)
parser.add_argument(
'database',
type=str,
help='Database of users and password to use.'
)
parser.add_argument(
'port',
nargs='+',
type=str,
help='Port to use to receive connections (Default: 1991).'
)
# Show help if one of the arguments is missing
if argsCount not in [2, 3]:
parser.print_help()
sys.exit()
# Get configuration
host = '127.0.0.1'
database = sys.argv[1]
port = int(sys.argv[2]) if argsCount == 3 else 1991
# Load user database
try:
Database.load(database)
except FileNotFoundError:
print("Database user not found")
sys.exit(0)
# Server initialization
serverSocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
try:
serverSocket.bind((host, port))
except socket.error:
print("Socket creation failed, maybe the port is already in use ?")
sys.exit()
# Listen new connection
print("Server ready, waiting for requests ...")
serverSocket.listen(1)
# Connection list (clients)
connectionList = {}
try:
while True:
connection, adresse = serverSocket.accept()
# Start a new client
thread = ThreadClient(connection)
thread.start()
# Store connection
id = thread.getName()
connectionList[id] = connection
# Send a welcome message
thread.send("MSG Welcome aboard !")
except KeyboardInterrupt:
print("Server shut down")