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server.py
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server.py
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from cryptography.hazmat.backends import default_backend
from hashlib import sha256
from message_type_pb2 import COMM_MESSAGE
from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives import padding
from cryptography.hazmat.primitives.asymmetric import padding as paddings
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives import serialization
from cryptography.hazmat.primitives import hashes
import time
import zmq
import sys
import os
import socket
import json
from diffiehellman.diffiehellman import DiffieHellman
class Server():
identities = None
socket_from_client = None
connection_from_client = None
def login_proto(self):
print ("something")
Message = COMM_MESSAGE()
data, temp = self.connection_from_client.recvfrom(4096)
print (temp)
Message.ParseFromString(data)
if Message.type == Message.TYPE.LOGIN:
N1 = os.urandom(16)
N1 = N1.hex()
print (N1)
digest = sha256()
digest.update(N1.encode())
Message.N1_hash = digest.hexdigest()
Message.message = N1[5:]
self.connection_from_client.sendall (Message.SerializeToString())
data, temp = self.connection_from_client.recvfrom(4096)
print (temp)
Message.ParseFromString(data)
if Message.N1 == N1:
print ("Puzzle figured out!")
else:
print ("Wrong!")
bob = DiffieHellman(group=5, key_length=200)
bob.generate_public_key()
Message.gb_mod_p = str (bob.public_key)
bob.generate_shared_secret(int (Message.message))
Kas = str(bob.shared_secret)[:16].encode()
# Kas = (bob.shared_secret).to_bytes(16,sys.byteorder)
print ("Shared secret is:", int.from_bytes (Kas, sys.byteorder))
Message.gb_mod_p = str (bob.public_key)
#### loading private key
with open("private_key.pem", "rb") as key_file:
private_key = serialization.load_pem_private_key(
key_file.read(),
password=None,
backend=default_backend())
#### encryption
plain_text_sign = Message.message + "|" + Message.gb_mod_p
plain_text_sign = plain_text_sign.encode()
### sign the text
signature = private_key.sign(
plain_text_sign,
paddings.PSS(
mgf=paddings.MGF1(hashes.SHA256()),
salt_length=paddings.PSS.MAX_LENGTH
),
hashes.SHA256()
)
#### Timestamp
timestamp = str (int(time.time()))
timestamp = timestamp.encode()
plain_text = signature + timestamp
iv = os.urandom(16)
Message.iv = iv
padder = padding.PKCS7(128).padder()
padded_data = padder.update(plain_text)
padded_data += padder.finalize()
plain_text_padded = padded_data
authenticate_data = b'Final Project'
# self.Message.authenticate_data = authenticate_data
# GCM Mode, we also need an IV
# encrypt
cipher = Cipher(algorithms.AES(Kas), modes.GCM(iv), backend=default_backend())
encryptor = cipher.encryptor()
encryptor.authenticate_additional_data(authenticate_data)
cipher_text = encryptor.update(plain_text_padded) + encryptor.finalize()
Message.cipher_text = cipher_text
Message.tag = encryptor.tag
self.connection_from_client.sendall(Message.SerializeToString())
### Decrypt and verify the client:
data = self.connection_from_client.recv(4096)
Message.ParseFromString(data)
# AES decryption
decryptor = Cipher(algorithms.AES(Kas), modes.GCM(iv, Message.tag),
backend=default_backend()).decryptor()
decryptor.authenticate_additional_data(authenticate_data)
decrypted_plain_text = decryptor.update(Message.cipher_text) + decryptor.finalize()
# unpad
unpadder = padding.PKCS7(128).unpadder()
plain_text = unpadder.update(decrypted_plain_text) + unpadder.finalize()
# Verify timestamp
plain_text_timestamp = plain_text[-10:]
message_timestamp = int (plain_text_timestamp)
if ((int(time.time()) - message_timestamp) < 60):
print ("Timestamp verified")
else:
print ("Timestamp failed!")
###
plain_text = plain_text[0:len(plain_text) - 10]
plain_text = plain_text.decode()
username = plain_text.split("|")[0]
password = plain_text.split("|")[1]
#if username == "Yushen" and password == "123":
# verify = "Success"
#else:
# verify = "Fail"
verify = "Fail"
if username in self.identities.keys():
pass_digest = sha256()
pass_digest.update(password.encode())
pass_digest.update(self.identities[username]["salt"].encode())
pass_hash = pass_digest.hexdigest()
print (pass_hash, "is the passhash")
if pass_hash == self.identities[username]["passhash"]:
verify = "Success"
####
plain_text = verify.encode()
timestamp = str(int(time.time()))
timestamp = timestamp.encode()
plain_text = plain_text + timestamp
padder = padding.PKCS7(128).padder()
padded_data = padder.update(plain_text)
padded_data += padder.finalize()
plain_text_padded = padded_data
cipher = Cipher(algorithms.AES(Kas), modes.GCM(iv), backend=default_backend())
encryptor = cipher.encryptor()
encryptor.authenticate_additional_data(authenticate_data)
cipher_text = encryptor.update(plain_text_padded) + encryptor.finalize()
Message.cipher_text = cipher_text
Message.tag = encryptor.tag
self.connection_from_client.sendall(Message.SerializeToString())
# connection_from_client.shutdown(0)
# self.socket_from_client.shutdown(0)
self.connection_from_client.close()
self.socket_from_client.close()
def __init__(self):
self.identities = None
with open("server_creds.json", "r") as creds:
self.identities = json.loads(creds.read())
self.socket_from_client = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.socket_from_client.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
serveraddress = ('localhost',9090)
self.socket_from_client.bind(serveraddress)
self.socket_from_client.listen(1)
self.connection_from_client, client_address = self.socket_from_client.accept()
# # print (connection_from_client[-1])
# # print (connection_from_client[1])
# print (connection_from_client)
# print (connection_from_client.getpeername())
# print (connection_from_client.getsockname())
# print (client_address)
self.login_proto()
if __name__ == '__main__':
server = Server()