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protocol.py
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protocol.py
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import socket
import sys
from Crypto import Random
from Crypto.Random import get_random_bytes
from Crypto.PublicKey import RSA
from Crypto.Cipher import PKCS1_OAEP
from Crypto.Cipher import AES
from binascii import hexlify
import base64, os
import random
import string
import hashlib
import threading
class votingsys:
n_cadastros = 0
n_clients = 0
cond = True
def votes(self):
my_dic = {}
for user in self.users:
my_dic[user] = False
return my_dic
def create_dics(self):
self.users = {}
# 'Voting Session 01' : {'Aninha':0, 'Day':0, 'Pucc4':0}
self.voting_sessions = {}
#dic para a votacao
self.user_votes = {}
def open_server(self, port):
self.server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.server_address = ('localhost', port)
self.server.bind(self.server_address)
self.server.listen(6)
os.system('clear')
print('server on')
self.generate_keys()
self.create_dics()
self.users = self.read_file()
self.mutex = threading.Lock()
def open_client(self, port, server_ip):
self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.server_address = (server_ip, port)
self.sock.connect(self.server_address)
self.generate_keys()
def server_wait_connection(self):
while self.cond:
client, client_address = self.server.accept()
t = threading.Thread(target=self.server_connection, args=(client,))
t.start()
def server_connection(self, client):
#self.n_clients = self.n_clients + 1
#if self.n_clients > 5:
#self.cond = False
client.sendall(self.public_key_str)
client_public_key = client.recv(4096)
client_public_key = RSA.importKey(client_public_key)
cipher = self.create_cipher(client_public_key)
message = client.recv(4096)
#servidor decifra a mensagem com sua chave privada e cifra com a chave publica do cliente
message = self.decrypt_message(message)
message = self.encrypt_message(message, cipher)
client.sendall(message)
secret_key = self.generate_secret_key()
encrypted_key = self.encrypt_message(secret_key, cipher)
client.sendall(encrypted_key)
self.server_login(client, secret_key)
#return (client, client_address)
def client_connection(self):
sock_public_key = self.sock.recv(4096)
sock_public_key = RSA.importKey(sock_public_key)
cipher = self.create_cipher(sock_public_key)
self.sock.sendall(self.public_key_str)
#cliente manda mensagem cifrada com a chave publica do servidor
message = self.random_message()
message2 = self.encrypt_message(message, cipher)
self.sock.sendall(message2)
#cliente recebe mensagem e decifra com sua chave privada pra ver se ela eh a mesma
message_recv = self.sock.recv(4096)
message_recv = self.decrypt_message(message_recv)
if(message != message_recv):
print('servidor nao confiavel')
self.close_connection(self.sock)
encrypted_key = self.sock.recv(4096)
secret_key = self.decrypt_message(encrypted_key)
return secret_key
def close_connection(self, sock):
print('closing socket')
sock.close()
def write_clients(self):
arquivo = open("usuarios.txt", "w")
for user in self.users:
arquivo.writelines(user + " " + self.users[user] + "\n")
arquivo.close()
def generate_keys(self):
self.private_key = RSA.generate(4096, Random.new().read)
self.public_key = self.private_key.publickey()
self.public_key_str = self.public_key.exportKey()
self.create_decipher(self.private_key)
def encrypt_message(self, message, cipher):
return cipher.encrypt(message)
def decrypt_message(self, message):
return self.decipher.decrypt(message)
def create_cipher(self, public_key):
#cifrar com a chave publica do outro
return PKCS1_OAEP.new(key=public_key)
def create_decipher(self, private_key):
#decirar com sua chave privada
self.decipher = PKCS1_OAEP.new(key=private_key)
def random_message(self):
tam = random.randrange(200)
letters = string.ascii_letters
message = ''.join(random.choice(letters) for i in range(tam))
return message
def generate_secret_key(self):
return os.urandom(16)
def encrypt_symmetric(self, message, secret_key):
iv = Random.new().read(AES.block_size)
padded_text = self.pad(message)
cipher = AES.new(secret_key, AES.MODE_CBC, iv)
dic = {
'message': cipher.encrypt(padded_text),
'iv' : iv
}
return str(dic)
def decrypt_symmetric(self, message, secret_key):
dic = eval(message)
m = dic['message']
iv = dic['iv']
cipher = AES.new(secret_key, AES.MODE_CBC, iv)
decrypted = cipher.decrypt(m)
original = self.unpad(decrypted)
return original
def pad(self, message):
block_size = 16
remainder = len(message) % block_size
padding_needed = block_size - remainder
return message + padding_needed * ' '
def unpad(self, message):
return message.rstrip()
def server_login(self, client, secret_key):
saiu = False
ret = False
usuario = ''
while not ret:
choice = self.recv_hash(client, secret_key)
if choice == '1':
ok = False
while not ok:
ok, user = self.user_login_server(client, secret_key)
ret = True
usuario = user
elif choice == '2':
ok = False
while not ok:
ok = self.cadastro_server(client, secret_key)
else:
self.write_clients()
self.close_connection(client)
ret = True
saiu = True
if not saiu:
ret = False
while not ret:
choice = self.recv_hash(client, secret_key)
if choice == '1':
self.send_voting_sessions(client, secret_key)
self.send_options(client, secret_key)
self.server_vote(client, usuario, secret_key)
elif choice == '2':
self.send_voting_sessions(client, secret_key)
self.server_results(client, secret_key)
elif choice == '3':
ok = self.server_create_session(client, secret_key)
while not ok:
ok = self.server_create_session(client, secret_key)
else:
self.write_clients()
self.close_connection(client)
ret = True
def checa_login(self, usuario, senha):
if self.users.get(usuario) == senha:
return True
else:
return False
def user_login_server(self, client, secret_key):
usuario = self.recv_hash(client, secret_key)
message = 'ok'
self.send_hash(message, client, secret_key)
senha = self.recv_password(client, secret_key)
ret = self.checa_login(usuario, senha)
if ret == False:
message = 'false'
self.send_hash(message, client, secret_key)
else:
message = 'true'
self.send_hash(message, client, secret_key)
return (ret, usuario)
def user_login_client(self, usuario, senha, secret_key):
self.send_hash(usuario, self.sock, secret_key)
ok = self.recv_hash(self.sock, secret_key)
self.send_password(senha, self.sock, secret_key)
ok = self.recv_hash(self.sock, secret_key)
if ok == 'true':
return True
return False
def cadastro_server(self, client, secret_key):
usuario = self.recv_hash(client, secret_key)
ok = 'ok'
self.send_hash(ok, client, secret_key)
senha = self.recv_password(client, secret_key)
ok = 'ok'
self.send_hash(ok, client, secret_key)
senha2 = self.recv_password(client, secret_key)
if senha != senha2:
message = 'Senhas diferentes. Tente novamente:'
self.send_hash(message, client, secret_key)
return False
elif usuario in self.users:
message = 'Usuario ja cadastrado. Tente novamente:'
self.send_hash(message, client, secret_key)
return False
else:
with self.mutex:
self.users[usuario] = senha
message = 'Usuario cadastrado com sucesso!'
self.send_hash(message, client, secret_key)
return True
def cadastro_client(self, usuario, senha, senha2, secret_key):
self.send_hash(usuario, self.sock, secret_key)
ok = self.recv_hash(self.sock, secret_key)
self.send_password(senha, self.sock, secret_key)
ok = self.recv_hash(self.sock, secret_key)
self.send_password(senha2, self.sock, secret_key)
message = self.recv_hash(self.sock, secret_key)
if message == 'Usuario cadastrado com sucesso!':
return True, message
return False, message
def server_results(self, client, secret_key):
session = self.recv_hash(client, secret_key)
if not session in self.voting_sessions:
message = 'Essa sessao nao existe'
self.send_hash(message, client, secret_key)
else:
finish = True
for users in self.users:
if not users in self.user_votes[session] or self.user_votes[session][users] == False:
finish = False
break
if finish == True:
message = str(self.voting_sessions[session])
self.send_hash(message, client, secret_key)
else:
message = 'Votacao ainda nao terminou'
self.send_hash(message, client, secret_key)
def client_results(self, session, secret_key):
self.send_hash(session, self.sock, secret_key)
result = self.recv_hash(self.sock, secret_key)
if result == 'Votacao ainda nao terminou' or result == 'Essa sessao nao existe':
return (False, result)
return (True, result)
def send_voting_sessions(self, client, secret_key):
array = []
for v in self.voting_sessions:
array.append(v)
array = str(array)
self.send_hash(array, client, secret_key)
def recv_voting_sessions(self, secret_key):
array = self.recv_hash(self.sock, secret_key)
array = eval(array)
return array
def send_options(self, client, secret_key):
session = self.recv_hash(client, secret_key)
array = []
if not session in self.voting_sessions:
array = str(array)
self.send_hash(array, client, secret_key)
return False
for x in self.voting_sessions[session]:
array.append(x)
array = str(array)
self.send_hash(array, client, secret_key)
return True
def recv_options(self, session, secret_key):
self.send_hash(session, self.sock, secret_key)
array = self.recv_hash(self.sock, secret_key)
array = eval(array)
return array
def client_vote(self, session, option, secret_key):
self.send_hash(session, self.sock, secret_key)
ok = self.recv_hash(self.sock, secret_key)
self.send_hash(option, self.sock, secret_key)
ok = self.recv_hash(self.sock, secret_key)
if ok == 'true':
return (True, ok)
return (False, ok)
def server_vote(self, client, my_user, secret_key):
session = self.recv_hash(client, secret_key)
ok = 'ok'
self.send_hash(ok, client, secret_key)
option = self.recv_hash(client, secret_key)
if not session in self.voting_sessions:
ok = 'Essa sessao nao exite'
self.send_hash(ok, client, secret_key)
return False
if not option in self.voting_sessions[session]:
ok = 'Essa opcao nao existe nessa sessao'
self.send_hash(ok, client, secret_key)
return False
if my_user in self.user_votes[session] and self.user_votes[session][my_user] == True:
ok = 'Usuario ja votou nessa sessao'
self.send_hash(ok, client, secret_key)
return False
ok = 'true'
self.send_hash(ok, client, secret_key)
with self.mutex:
self.voting_sessions[session][option] = self.voting_sessions[session][option] + 1
self.user_votes[session][my_user] = True
return True
def server_create_session(self, client, secret_key):
name = self.recv_hash(client, secret_key)
ok = 'ok'
self.send_hash(ok, client, secret_key)
options = self.recv_hash(client, secret_key)
options = eval(options)
if name in self.voting_sessions:
message = 'false'
self.send_hash(message, client, secret_key)
return False
else:
with self.mutex:
self.voting_sessions[name] = options
#dic para a votacao daquela sessao
self.user_votes[name] = {}
self.user_votes[name] = self.votes()
message = 'true'
self.send_hash(message, client, secret_key)
return True
def client_create_session(self, name, options, secret_key):
self.send_hash(name, self.sock, secret_key)
ok = self.recv_hash(self.sock, secret_key)
self.send_hash(str(options), self.sock, secret_key)
ok = self.recv_hash(self.sock, secret_key)
if ok == 'true':
return True
return False
def send_hash(self, message, sock, secret_key):
message = self.format_message(message)
message = self.encrypt_symmetric(message, secret_key)
sock.sendall(message)
def recv_hash(self, sock, secret_key):
message = sock.recv(4096)
message = self.decrypt_symmetric(message, secret_key)
#essa func da erro aqui as vezes
message = eval(message)
if not self.compare_message(message):
print('servidor nao confiavel')
self.close_connection(sock)
return message['message']
def send_password(self, password, sock, secret_key):
password = hashlib.sha256(password).hexdigest()
#print(password)
password = self.encrypt_symmetric(password, secret_key)
sock.sendall(password)
def recv_password(self, sock, secret_key):
password = sock.recv(4096)
password = self.decrypt_symmetric(password, secret_key)
return password
def format_message(self, message):
hashed = hashlib.sha256(message).hexdigest()
dic = {
'message' : message,
'hashed' : hashed
}
return str(dic)
def compare_message(self, dic):
m = hashlib.sha256(dic['message']).hexdigest()
hashed = dic['hashed']
return m == hashed
def read_file(self):
lista_users = []
arquivo = open("usuarios.txt", "r")
lista_users = arquivo.readlines()
arquivo.close()
my_dic = {}
for users in lista_users:
user_aux = users.split(" ")
length = len(user_aux[1])
user_name = user_aux[0]
password = user_aux[1]
password = password[0:(length-1)]
my_dic[user_name] = password
self.n_cadastros = self.n_cadastros + 1
return my_dic