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client_topichash_connection.py
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client_topichash_connection.py
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import src.paho_folder.mqtt.client as mqtt
import random
from diffiehellman import DiffieHellman
import logging
from cryptography.hazmat.primitives import serialization
from cryptography.x509 import load_pem_x509_certificate
from os.path import exists, join
from cryptography.hazmat.primitives import hashes, hmac
from cryptography.hazmat.primitives.asymmetric import padding
import os
from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
import base64
from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
from cryptography.hazmat.primitives import padding as padding2
from cryptography.hazmat.backends import default_backend
from django.utils.encoding import force_bytes, force_str
import secrets
import asyncio
from src.paho_folder.mqtt.client import Client
from tkinter import*
from tkinter import messagebox
from binascii import unhexlify
from random import SystemRandom
from random import SystemRandom
import hashlib
import time
import datetime
logging.basicConfig(level=logging.DEBUG)
logger = logging.getLogger("clientwild_logging")
MQTT_ERR_NO_CONN = 4
class MyMQTTClass(mqtt.Client):
def __init__(self):
super().__init__() # önce super init fonksiyonunu çağırmak gerekir
#self.disconnect_flag = False
self.connected_flag =False
self._client_id = b''
self.msg = None
self.client_x509_private_key = None
self.client_x509_public_key = None
self.client_x509 = None
self.key_establishment_state = 1
self.client_diffiehellman = None
self.client_dh_public_key = None
self.broker_dh_public_key = None
self.dh_shared_key = None
self.broker_x509 = None
self.id_client = None
self.disconnect_flag = False
self.verified = False
self.session_key = None
self.nonce1 = None
self.nonce2 = None
self.comming_client_id = None
self.nonce3 = None
self.authenticated = False
self.choiceTokenDictionary = {}
self.choice_token_state = 0
self.choice_state_dict = {}
self.subscriber_choice_token_session = {}
self.publisher_choice_token_session = {}
self.publish_bad_mac = False
self.unsub_bad_mac = False
self.sub_bad_mac = False
self.fail_to_verify_mac = False
#fix for now, will be checked later
self._sock = None
self._sockpairR = None
self._sockpairW = None
self._dontreconnect = False
#fix for now, will be checkec later
self.subscribe_success:list = []
self.publish_success:list = []
self.subscribe_success_topic_hash = 0
self.publish_success_topic_hash:list = []
self.unsub_success: bool = False
self.seed_dictionary = {} #used by subscribers
self.topic_hash_dictionary = {} #used by subscribers
self.hash_topic_dictionary = {} #used by subscribers
self.topicname_hash_dictionary = {} #used by publishers
self.publisher_seed_dictionary = {} #used by publishers
self.publisher_topic_dictionary = {} #used by subscribers
self.poly_list = [] #used by subscribers
self.polynomials:list = [] #used by publishers
self.topic_subscribe_boolean = {} #used by subscribers
self.MAX_COUNT = 5
self.count = 0
self.count_dictionary = {} #used by subscriber
self.publisher_hash_session_topics = {} #used by publisher
self.hash_session_end = False #used by publisher
self.topic_hashing_clear = False #used by subscriber
self.tick_bool = False #used by publisher
self.tick_come = False #used by subscriber
#TEMPORARY
self._entered_on_message = False
def polynomial_func(self,x,a,b,c,d):
y = a *(x*x*x) + b*(x*x) + c *(x) + d
y = y % 9000
y += 1000
print (y)
return y
def cert_read_fnc(self):
cert_dir = "."
CERT_FILE = "./cert_create/key.pem"
C_F = join(cert_dir, CERT_FILE)
private_key = "None"
try:
if exists(C_F):
with open(CERT_FILE, "rb") as key_file:
private_key = serialization.load_pem_private_key(
key_file.read(),
password= None,
)
if (private_key != "None"):
public_key = private_key.public_key()
private_pem = private_key.private_bytes(
encoding=serialization.Encoding.PEM,
format=serialization.PrivateFormat.TraditionalOpenSSL,
encryption_algorithm=serialization.NoEncryption()
)
private_pem.splitlines()[0]
#print("X509 Private key of Client: ", private_pem )
#print("Private key of X509 is read from the certificate")
public_pem = public_key.public_bytes(
encoding=serialization.Encoding.PEM,
format=serialization.PublicFormat.SubjectPublicKeyInfo
)
public_pem.splitlines()[0]
with open("./cert_create/certificate.pem", "rb") as key_file:
x509 = load_pem_x509_certificate(
key_file.read()
)
public_key2 = x509.public_key()
pem2 = public_key2.public_bytes(
encoding=serialization.Encoding.PEM,
format=serialization.PublicFormat.SubjectPublicKeyInfo
)
pem2.splitlines()[0]
#print("X509 Public key of Client:", pem2)
x509_pem = x509.public_bytes(encoding=serialization.Encoding.PEM)
logger.log(logging.INFO, b'X509 Certificate of Client: \n' + x509_pem)
logger.log(logging.INFO, b'X509 Public key of Client: \n ' + pem2)
#print("X509 Certificate of Client: ", x509_pem)
#print("X509 Public key of Client: ", pem2)
self.client_x509 = x509
self.client_x509_private_key = private_key
self.client_x509_public_key = public_key
else:
#print("Client cannot read the cerficate")
logger.log(logging.INFO, "Client cannot read the cerficate")
except:
#print("Client cannot read the cerficate")
logger.log(logging.INFO, "Client cannot read the cerficate")
def on_message(self, mqttc, obj, msg):
logger.log(logging.INFO, "----Publish message was received from broker")
logger.log(logging.INFO, b'payload: ' + msg.payload)
logger.log(logging.INFO, 'topic: ' + msg.topic )
def on_publish(self, mqttc, obj, mid):
logger.log(logging.INFO, "PUBLISH message sent, message id: " + str(mid))
def on_subscribe(self, mqttc, obj, mid, granted_qos):
logger.log(logging.INFO, "Suback received, message id: "+ str(mid))
if (self.authenticated == True):
suback_packet = self.get_mac()
index1 = suback_packet.index(b'::::')
mac_real = suback_packet[index1+4:]
byte_packet_id = force_bytes(str(mid), 'utf-8')
message = byte_packet_id + b'::::' + b'1'
h = hmac.HMAC(self.session_key, hashes.SHA256())
h.update(message)
signature = h.finalize()
#logger.log(logging.INFO, b'Calculated HMAC of SUBACK:' + signature)
#logger.log(logging.INFO, b'Received HMAC of SUBACK:' + mac_real)
if (mac_real == signature):
logger.log(logging.INFO, "Signature of SUBACK is verified." )
else:
logger.log(logging.ERROR, "Signature of SUBACK is not verified." )
self.suback_verified = False
def on_unsubscribe(self, mqttc, obj, mid):
packet_bytes = self.get_packet_bytes()
logger.log(logging.INFO, "Unsuback was received, message Id: " + str(mid))
#logger.log(logging.ERROR, "mac " + str(packet_bytes))
index1 = packet_bytes.index(b'::::')
mac_real = packet_bytes[index1+4:]
#logger.log(logging.ERROR, "mac " + str(mac_real))
byte_packet_id = force_bytes(str(mid), 'utf-8')
message = byte_packet_id
h = hmac.HMAC(self.session_key, hashes.SHA256())
h.update(message)
signature = h.finalize()
#logger.log(logging.ERROR, "mac " + str(signature))
#logger.log(logging.INFO, b'Calculated HMAC of UNSUBACK:' + signature)
#logger.log(logging.INFO, b'Received HMAC of UNSUBACK:' + mac_real)
if (mac_real == signature):
logger.log(logging.INFO, "Signature of UNSUBACK is verified.")
else:
logger.log(logging.ERROR, "Signature of UNSUBACK is not verified.")
self.unsuback_verified = False
#need to take an action here
def on_log(self, mqttc, obj, level, string):
msg1 = "failed to receive on socket"
if (string.find(msg1) != -1) :
#logger.log(logging.ERROR,"--------on_log()----"+ string)
self.disconnect_flag = True
#else:
#logger.log(logging.INFO,"--------on_log()----"+ string)
def on_connect_fail(self, mqttc):
self.suppress_exceptions = True
logger.log(logging.ERROR, "Connection failed")
def on_connect(self, mqttc, obj, flags, rc):
self.suppress_exceptions = True
logger.log(logging.INFO, "Connection successful (step 2), return code: "+str(rc))
self.connected_flag = True
self.key_establishment_state = 2
self.msg = "connected"
def connect_mqtt(self, id_client) -> mqtt:
self._client_id = id_client
self.connect("127.0.0.1", 1883, 6000)
#self.connect("176.43.5.64", 1883, 6000) #STATIC IP ADDRESS
logger.log(logging.INFO, "---Connection message send to broker (step 1)---")
return self
def publish_step6(self, client: mqtt) -> mqtt: #diffie hellman step 6 publish
def on_publish(client, obj, mid):
logger.log(logging.INFO, "Publish message (step 6 of the DH Key Exchange) was send, messageID =" + str(mid))
self.key_establishment_state = 7
client.on_publish = on_publish
logger.log(logging.INFO, "----Function: Prepare publish message for step 6 of the DH key exchange----")
dh = DiffieHellman(group=14, key_bits=256)
dh_public = dh.get_public_key()
self.client_diffiehellman = dh
self.client_dh_public_key = dh_public
try:
client_ID_byte = bytes(self.id_client, 'UTF-8')
message = self.client_dh_public_key + b'::::'+ self.nonce1 + b'::::' + client_ID_byte #nonce added
#message = self.client_dh_public_key + b'::::'+ self.nonce1 + b'::::' #error casess
signature = self.client_x509_private_key.sign(
message,
padding.PSS(
mgf=padding.MGF1(hashes.SHA256()),
salt_length=padding.PSS.MAX_LENGTH
),
hashes.SHA256()
)
except Exception as e3:
logger.log(logging.INFO, "ERROR %r " + e3.args)
client_x509_pem = self.client_x509.public_bytes(encoding=serialization.Encoding.PEM)
data_to_sent = client_x509_pem + b'::::' + dh_public + b'::::' + self.nonce1 + b'::::' + signature #nonce added
logger.log(logging.INFO, "PAYLOAD TO BE SEND TO BROKER FOR STEP 6:")
logger.log(logging.INFO, b'CLIENT X509 CERTIFICATE: ' + client_x509_pem)
logger.log(logging.INFO, b'CLIENT DIFFIE HELLMAN PUBLIC KEY: ' + dh_public)
logger.log(logging.INFO, b'NONCE 1: ' + self.nonce1)
logger.log(logging.INFO, b'CLIENT RSA SIGN: ' + signature)
#print("MESSAGE (step 6 of the DH Key Exchange): " , data_to_sent)
client.publish("AuthenticationTopic", data_to_sent, qos = 1)
self.key_establishment_state = 6
return client
def publish_step9(self, client: mqtt) -> mqtt:
def on_publish(client, obj, mid):
logger.log(logging.INFO, "Publish message (step 9 of the DH Key Exchange) was send, messageID =" + str(mid))
self.key_establishment_state = 10
client.on_publish = on_publish
logger.log(logging.INFO, "----Function: Prepare publish message for step 9 of the DH key exchange----")
backend = default_backend()
nonce3 = secrets.token_urlsafe()
self.nonce3 = bytes(nonce3, 'utf-8') #nonce3 setted for later
logger.log(logging.INFO, "Nonce 3: " + nonce3)
value_str = force_str(self.nonce2) + "::::" + nonce3 + "::::" + self.id_client
value = force_bytes(value_str)
encryptor = Cipher(algorithms.AES(self.session_key), modes.ECB(), backend).encryptor()
padder = padding2.PKCS7(algorithms.AES(self.session_key).block_size).padder()
padded_data = padder.update(value) + padder.finalize()
encrypted_text = encryptor.update(padded_data) + encryptor.finalize()
logger.log(logging.INFO, b'Encrypted message (step 9 of the DH Key Exchange): ' + encrypted_text)
client.publish("AuthenticationTopic", encrypted_text , qos = 1)
self.key_establishment_state = 9
return client
def publish_real_topics(self, client: mqtt, topicName, message) -> mqtt:
def on_publish(client, obj, mid):
logger.log(logging.INFO, "Puback was received, messageID =" + str(mid))
puback = self.get_puback()
#logger.log(logging.ERROR, "mac " + str(puback))
index1 = puback.index(b'::::')
mac_real = puback[index1+4:]
#logger.log(logging.ERROR, "mac " + str(mac_real))
byte_packet_id = force_bytes(str(mid), 'utf-8')
message = byte_packet_id
h = hmac.HMAC(self.session_key, hashes.SHA256())
h.update(message)
signature = h.finalize()
#logger.log(logging.ERROR, "mac " + str(signature))
#logger.log(logging.INFO, b'Calculated HMAC of PUBACK:' + signature)
#logger.log(logging.INFO, b'Received HMAC of PUBACK:' + mac_real)
if mac_real == signature:
logger.log(logging.INFO, "Signature of PUBACK is verified.")
else:
logger.log(logging.ERROR, "Signature of PUBACK is not verified. You might want to make another publish.")
#taking an action is needed or not
client.on_publish = on_publish
logger.log(logging.INFO, "----Function to publish to topic: " + topicName )
logger.log(logging.INFO, "Message to be published: " + message)
topicName_byte = force_bytes(topicName)
choiceTokenhex = self.choiceTokenDictionary[topicName]
choiceToken = unhexlify(choiceTokenhex)
h = hmac.HMAC(self.session_key, hashes.SHA256())
h.update(topicName_byte)
signature = h.finalize()
#signature = b'broken'
topic_publish = topicName_byte + b'::::' + signature
backend = default_backend()
encryptor = Cipher(algorithms.AES(self.session_key), modes.ECB(), backend).encryptor()
padder = padding2.PKCS7(algorithms.AES(self.session_key).block_size).padder()
padded_data = padder.update(topic_publish) + padder.finalize()
encrypted_topic = encryptor.update(padded_data) + encryptor.finalize()
encrypted_topic_hex = encrypted_topic.hex()
logger.log(logging.INFO, "Authenticated encryption version of the topic name to be published: " + encrypted_topic_hex)
message_byte = force_bytes(message)
choicetoken_key = force_bytes(base64.urlsafe_b64encode(force_bytes(choiceToken))[:32])
#print("245 choiceTokenKEY: ", choicetoken_key)
encryptor = Cipher(algorithms.AES(choicetoken_key), modes.ECB(), backend).encryptor()
padder = padding2.PKCS7(algorithms.AES(choicetoken_key).block_size).padder()
padded_data = padder.update(message_byte) + padder.finalize()
encrypted_message = encryptor.update(padded_data) + encryptor.finalize()
encrypted_message_byte = force_bytes(encrypted_message)
logger.log(logging.INFO, b'Message after encryption with the choice token: '+ encrypted_message)
qos = 1
retainFlag = False
msgid = self._mid_generate()
hash_message_str = str(qos) + str(retainFlag) + str(msgid)
#hash_message_str = str(qos) + str(retainFlag) #for error cases
hash_message_bytes = encrypted_message_byte + force_bytes(hash_message_str)
h = hmac.HMAC(self.session_key, hashes.SHA256())
h.update(hash_message_bytes)
signature2 = h.finalize()
message_publish = encrypted_message_byte + b'::::' + signature2
encryptor = Cipher(algorithms.AES(self.session_key), modes.ECB(), backend).encryptor()
padder = padding2.PKCS7(algorithms.AES(self.session_key).block_size).padder()
padded_data = padder.update(message_publish) + padder.finalize()
encrypted_message2 = encryptor.update(padded_data) + encryptor.finalize()
logger.log(logging.INFO, b'Message after authenticated encyption with the session key: '+ encrypted_message2)
client.publish(encrypted_topic_hex, encrypted_message2 , qos = qos, retain = retainFlag, msgid=msgid)
self.publish_success.append(topicName)
return client
def publishForChoiceToken(self, client: mqtt,topicname1x) -> mqtt:
def on_publish(client, obj, mid):
logger.log(logging.INFO, "----Puback was received---- (step 3 of choice token schema) ")
puback = self.get_puback()
#logger.log(logging.ERROR, "mac " + str(puback))
index1 = puback.index(b'::::')
mac_real = puback[index1+4:]
#logger.log(logging.ERROR, "mac " + str(mac_real))
byte_packet_id = force_bytes(str(mid), 'utf-8')
message = byte_packet_id
h = hmac.HMAC(self.session_key, hashes.SHA256())
h.update(message)
signature = h.finalize()
#logger.log(logging.ERROR, "mac " + str(signature))
#logger.log(logging.INFO, b'Calculated HMAC of PUBACK:' + signature)
#logger.log(logging.INFO, b'Received HMAC of PUBACK:' + mac_real)
if mac_real == signature:
logger.log(logging.INFO, "Signature of PUBACK is verified.")
else:
logger.log(logging.ERROR, "Signature of PUBACK is not verified.")
client.on_publish = on_publish
try:
#print("----Function: Prepare publish message for step 2 of the choice token schema----")
logger.log(logging.INFO, "----Function: Prepare publish message for step 2 of the choice token schema----")
#print(type(self.client_x509_private_key))
#print(type(self.session_key))
message = b'choiceToken'
#message2 = b'choiceToken2' # for error cases
h = hmac.HMAC(self.session_key, hashes.SHA256())
h.update(message)
signature = h.finalize()
#print(signature)
#bilgesu modificaiton distoring signature on purpose to see the fail case
#signature = b'distortedSignature'
#this line will be removed
#print("DISTORTED SIGNATURE: ", signature)
topicName = message + b'::::' + signature
#print(topicName)
backend = default_backend()
encryptor = Cipher(algorithms.AES(self.session_key), modes.ECB(), backend).encryptor()
padder = padding2.PKCS7(algorithms.AES(self.session_key).block_size).padder()
padded_data = padder.update(topicName) + padder.finalize()
topicNameEncryptedByte = encryptor.update(padded_data) + encryptor.finalize()
#print("len: ",len(topicNameEncryptedByte))
#print(topicNameEncryptedByte)
topicNameEncryptedHex = topicNameEncryptedByte.hex()
#print(" len of hex: ",len(topicNameEncryptedHex))
#topicNameEncryptedHex = topicNameEncryptedHex[1:]
#print("topicNameEncryptedByte: ", topicNameEncryptedByte)
#print("topicNameEncryptedHex: ", topicNameEncryptedHex)
clientobj = mqtt.Client
msgid = self._mid_generate()
retainFlag = False
qos = 1
messagex = topicname1x + self.id_client + str(qos)+ str(retainFlag) + str(msgid)
#messagex = topicname1x + self.id_client + str(qos)+ str(retainFlag) #for error cases
#print("messagex:", messagex )
message_byte = force_bytes(messagex)
logger.log(logging.INFO, b'Message bytes: '+ message_byte)
#topicWanted = b'light'
#print("topicWanted : ",topicWanted)
h = hmac.HMAC(self.session_key, hashes.SHA256())
h.update(message_byte)
signature = h.finalize()
#bilgesu modificaiton distoring signature on purpose to see the fail case
#signature = "distortedSignature"
#this line will be removed
topicWanted = force_bytes(topicname1x)
payload = topicWanted + b'::::' + signature
logger.log(logging.INFO, b'Payload: '+ payload)
encryptor = Cipher(algorithms.AES(self.session_key), modes.ECB(), backend).encryptor()
padder = padding2.PKCS7(algorithms.AES(self.session_key).block_size).padder()
padded_data = padder.update(payload) + padder.finalize()
payloadByte = encryptor.update(padded_data) + encryptor.finalize()
#logger.log(logging.INFO, "Authenticated encryption version of the topic name 'choiceToken': " + topicNameEncryptedHex)
logger.log(logging.INFO, b'Payload contains the authenticated encryption version of the topic name for which a choice token is asked: '+ topicWanted)
#logger.log(logging.INFO, b'Authenticated encryption version of the payload: ' + payloadByte)
obj1 = client.publish(topicNameEncryptedHex, payloadByte , qos = qos, retain = retainFlag, msgid =msgid)
print("msgid", obj1.mid)
print("retain", retainFlag)
print("retain")
#logger.log(logging.INFO, retainFlag)
#print("----Publish was sent to 'choiceToken' topic (step 2 of choice token schema)----")
logger.log(logging.INFO, "----Publish was sent to 'choiceToken' topic (step 2 of choice token schema)----")
self.choice_state_dict[topicname1x] = 1
except Exception as e3:
#print("ERROR %r ", e3.args)
logger.log(logging.INFO, "ERROR %r ", e3.args)
def subscribe_encrypted_clientID(self, client: mqtt, id_client):
def on_message(client, userdata, msg):
logger.log(logging.INFO, "----Publish message was received from broker (step 4 of choice token schema)---- from topic: " + msg.topic )
data = msg.payload
data_len = data[0:2]
actual_data = data[2:]
#logger.log(logging.INFO, b'Encrypted data: '+ actual_data )
backend = default_backend()
decryptor = Cipher(algorithms.AES(self.session_key), modes.ECB(), backend).decryptor()
padder = padding2.PKCS7(algorithms.AES(self.session_key).block_size).unpadder()
decrypted_data = decryptor.update(actual_data)
unpadded = padder.update(decrypted_data) + padder.finalize()
logger.log(logging.INFO, b'Decrypted data: '+ unpadded )
indexMAC = unpadded.rfind(b'::::')
topic_and_choiceTokens = unpadded[0:indexMAC]
mac_of_choice_token = unpadded[indexMAC+4:]
#print("mac_of_choice_token", mac_of_choice_token)
#print("topic_and_choiceTokens", topic_and_choiceTokens)
index1 = topic_and_choiceTokens.index(b'::::')
topicName = topic_and_choiceTokens[0:index1]
choiceToken = topic_and_choiceTokens[index1+4:]
to_check = bytes(self.id_client, 'utf-8') + b'::::signVerifyFailed'
#bilgesu: modification
if topic_and_choiceTokens == to_check:
self.fail_to_verify_mac = True
logger.log(logging.ERROR, " Received signVerifyFailed from broker, wont get choicetoken")
return client
else:
#print("choiceToken: ", choiceToken)
#print("Topic name:", topicName, " and its choiceToken: ", choiceToken.hex())
print("msg.qos + msg.retain + msg.mid: ", msg.qos , msg.retain , msg.mid)
if msg.retain == 0:
retainFlag = False
else:
retainFlag = False
message_str = str(msg.qos) + str(retainFlag) + str(msg.mid)
#message_str = str(msg.qos) + str(retainFlag) #for error cases
message_bytes = topic_and_choiceTokens + force_bytes(message_str)
print("message_bytes: ", message_bytes)
h = hmac.HMAC(self.session_key, hashes.SHA256())
h.update(message_bytes)
signature = h.finalize()
#print("Received MAC of the payload: ", mac_of_choice_token )
#print("Calculated MAC of the payload: ", signature )
logger.log(logging.INFO, b'Received MAC of the payload: '+ mac_of_choice_token )
logger.log(logging.INFO, b'Calculated MAC of the payload: '+ signature )
if(mac_of_choice_token == signature):
#print("The content of the message has not been changed. Mac is correct ")
logger.log(logging.INFO, "The content of the message has not been changed. Mac is correct.")
topicName_str = bytes.decode(topicName)
#print("choicetoken 367: ", choiceToken)
choiceTokenHex = choiceToken.hex()
logger.log(logging.INFO, b'Topic name: '+ topicName )
logger.log(logging.INFO, "Its choiceToken: " + choiceToken.hex())
#print("choicetokenhex 371:", choiceTokenHex)
self.choiceTokenDictionary[topicName_str] = choiceTokenHex
#print(self.choiceTokenDictionary)
self.choice_state_dict[topicName_str] = 2
else:
#print("The content of the message has been changed. Mac is not correct")
self.fail_to_verify_mac = True
logger.log(logging.ERROR, "The content of the message has been changed. Mac is not correct")
client.on_message = on_message
if (self.choice_token_state == 0):
#mac_message = message +
msgid = self._mid_generate()
print("before msgid sub", msgid)
qos = 1
message_str = self.id_client + str(qos) + str(msgid)
print("message_str: ", message_str)
message_hash = bytes(message_str, 'utf-8')
message = bytes(self.id_client, 'utf-8')
print("message :", message)
h = hmac.HMAC(self.session_key, hashes.SHA256())
h.update(message_hash)
signature = h.finalize()
topicName = message + b'::::' + signature
backend = default_backend()
encryptor = Cipher(algorithms.AES(self.session_key), modes.ECB(), backend).encryptor()
padder = padding2.PKCS7(algorithms.AES(self.session_key).block_size).padder()
padded_data = padder.update(topicName) + padder.finalize()
topicNameEncryptedByte = encryptor.update(padded_data) + encryptor.finalize()
topicNameEncryptedHex = topicNameEncryptedByte.hex()
client.subscribe(topicNameEncryptedHex, qos= qos, msgid = msgid)
#print("----Client was subscribed to its encrypted clientID (step 1 of the choice token schema)")
#print("Authenticated Encryption version of the clientID: ", topicNameEncryptedHex )
logger.log(logging.INFO, "----Client was subscribed to its encrypted clientID (step 1 of the choice token schema)")
logger.log(logging.INFO,"Authenticated Encryption version of the clientID: " + topicNameEncryptedHex )
self.choice_token_state = 1
return client
def subscribe_real_topics(self, client: mqtt, topicname):
def on_message(client, userdata, msg):
#print("----Publish message was received from broker")
recevied_subscribe_start_time = time.time()
logger.log(logging.INFO, "----Publish message was received from broker")
data = msg.payload
actual_data = data[2:]
#print("Encrypted topic: " ,msg.topic )
#print(f"Encrypted payload: `{actual_data}`")
logger.log(logging.INFO, b'Encrypted topic: ' + msg.topic )
logger.log(logging.INFO, b'Encrypted payload: ' + actual_data)
topic_hex = msg.topic
topic_byte = unhexlify(topic_hex)
backend = default_backend()
decryptor = Cipher(algorithms.AES(self.session_key), modes.ECB(), backend).decryptor()
padder = padding2.PKCS7(algorithms.AES(self.session_key).block_size).unpadder()
decrypted_data = decryptor.update(topic_byte)
unpadded = padder.update(decrypted_data) + padder.finalize()
index1 = unpadded.index(b'::::')
topic_name = unpadded[0:index1]
mac_of_topic_name = unpadded[index1+4:]
if topic_name == b'wildcardChoiceToken':
logger.log(logging.INFO, "CHOICE TOKEN FOR THE WILDCARD TOPIC AFTER DECRYPTION" )
piece_2 = unpadded[index1+4:]
index2 = piece_2.index(b'::::')
piece_topic = piece_2[0:index2]
piece_3 = piece_2[index2+4:]
index3 = piece_3.index(b'::::')
piece_choiceToken = piece_3[0:index3]
piece_mac = piece_3[index3+4:]
piece_topic = force_str(piece_topic)
piece_choiceToken = piece_choiceToken.hex()
self.choiceTokenDictionary[piece_topic] = piece_choiceToken
logger.log(logging.INFO, "Topic name: " + piece_topic)
logger.log(logging.INFO, "Its corresponding choice token: " + piece_choiceToken)
return client
topic_name_str = bytes.decode(topic_name)
choiceTokenhex = self.choiceTokenDictionary[topic_name_str]
choiceToken = unhexlify(choiceTokenhex)
#print("Choice token from dictionary:",self.choiceTokenDictionary[topic_name_str])
#print("Topic name from dictionary:",topic_name_str)
#print("Decrypted topic name: ", topic_name_str ," and its mac: ", mac_of_topic_name)
#print("Choice token of the topic: ", choiceTokenhex )
logger.log(logging.INFO, b'Decrypted topic name: ' + topic_name + b' and its mac: ' + mac_of_topic_name)
logger.log(logging.INFO, "Choice token of the topic: "+ choiceTokenhex )
h = hmac.HMAC(self.session_key, hashes.SHA256())
h.update(topic_name)
signature = h.finalize()
if(signature == mac_of_topic_name):
#print("The content of the topic name is not changed. Mac of the topic name is correct")
logger.log(logging.INFO, "The content of the topic name is not changed. Mac of the topic name is correct")
data = msg.payload
data_len = data[0:2]
actual_data = data[2:]
decryptor = Cipher(algorithms.AES(self.session_key), modes.ECB(), backend).decryptor()
padder = padding2.PKCS7(algorithms.AES(self.session_key).block_size).unpadder()
decrypted_data = decryptor.update(actual_data)
unpadded = padder.update(decrypted_data) + padder.finalize()
index1 = unpadded.index(b'::::')
message_encrypted_with_ct = unpadded[0:index1]
mac_of_payload = unpadded[index1+4:] #change mac of payload after update
#print("Message after decryption with session key: ", message_encrypted_with_ct)
logger.log(logging.INFO, b'Message after decryption with session key: '+ message_encrypted_with_ct)
choicetoken_key = force_bytes(base64.urlsafe_b64encode(force_bytes(choiceToken))[:32])
#print("Choicetoken key: ", choicetoken_key)
decryptor = Cipher(algorithms.AES(choicetoken_key), modes.ECB(), backend).decryptor()
padder = padding2.PKCS7(algorithms.AES(choicetoken_key).block_size).unpadder()
decrypted_data2 = decryptor.update(message_encrypted_with_ct)
unpadded_message = padder.update(decrypted_data2) + padder.finalize()
#print("Message after decryption with choice token: ", unpadded_message, " from topic: ", topic_name_str )
logger.log(logging.INFO, b'Message after decryption with choice token: '+ unpadded_message)
logger.log(logging.INFO, "Topic name: "+ topic_name_str)
if msg.retain == 0:
retainFlag = False
else:
retainFlag = True
message_hash_str = str(msg.qos) + str(retainFlag) + str(msg.mid)
message_bytes_hash = message_encrypted_with_ct + force_bytes(message_hash_str)
print("message_hash_str ", message_hash_str)
print("message_bytes_hash ", message_bytes_hash)
h = hmac.HMAC(self.session_key, hashes.SHA256())
h.update(message_bytes_hash)
signature = h.finalize()
if(signature == mac_of_payload):
#print("The content of the payload is not changed, Mac of the payload is correct")
logger.log(logging.INFO, "The content of the payload is not changed, Mac of the payload is correct")
recevied_subscribe_end_time = time.time()
elapsed_time = recevied_subscribe_end_time - recevied_subscribe_start_time
#logger.log(logging.CRITICAL, "Elapsed time for decrypting a received message: " + str(elapsed_time))
#print("MESSAGE: " ,unpadded_message, "FROM ", topic_namepub )
else:
#print("The content of the payload is changed, Mac of the payload is not correct")
logger.log(logging.ERROR, "The content of the payload is changed, Mac of the payload is not correct")
else:
#print("The content of the topic name is changed")
logger.log(logging.ERROR, "The content of the topic name is changed")
if(self.choice_state_dict[topicname] == 2):
client.on_message = on_message
#print("----Function to subscribe to topic: ", topicname )
logger.log(logging.INFO, "----Function to subscribe to topic: "+ topicname )
topicName_byte = force_bytes(topicname)
msgid = self._mid_generate()
print("before msgid sub", msgid)
qos = 1
topicname_str = topicname + str(qos) + str(msgid)
#topicname_str = topicname + str(qos) #for error cases. broker.py'deki 785.satıra gidiyor
hash_bytes = force_bytes(topicname_str)
h = hmac.HMAC(self.session_key, hashes.SHA256())
h.update(hash_bytes)
signature = h.finalize()
#print("MAC of the topic: ", signature )
logger.log(logging.INFO, b'MAC of the topic: '+ signature )
topicName_subscribe = topicName_byte + b'::::' + signature
backend = default_backend()
encryptor = Cipher(algorithms.AES(self.session_key), modes.ECB(), backend).encryptor()
padder = padding2.PKCS7(algorithms.AES(self.session_key).block_size).padder()
padded_data = padder.update(topicName_subscribe) + padder.finalize()
topicNameEncryptedByte = encryptor.update(padded_data) + encryptor.finalize()
topicNameEncryptedHex = topicNameEncryptedByte.hex()
#print("Authenticated encryption version of the topic:" ,topicNameEncryptedHex )
logger.log(logging.INFO, "Authenticated encryption version of the topic:" + topicNameEncryptedHex )
client.subscribe(topicNameEncryptedHex, qos=qos, msgid = msgid)
#print("Subscribed to: " ,topicNameEncryptedHex )
logger.log(logging.INFO, "Subscribed to: " + topicNameEncryptedHex )
self.choice_state_dict[topicname] = 3
self.subscribe_success.append(topicname)
return client
async def receive_message_after_unsub(self, client:Client):
#logger.log(logging.INFO, "In receive messag after unsub.")
def on_unsubscribe(self, obj, mid):
packet_bytes = client.get_packet_bytes()
logger.log(logging.INFO, "Unsuback was received, message Id:subscribe4 " + str(mid))
#logger.log(logging.ERROR, "mac " + str(packet_bytes))
index1 = packet_bytes.index(b'::::')
mac_real = packet_bytes[index1+4:]
#logger.log(logging.ERROR, "mac " + str(mac_real))
byte_packet_id = force_bytes(str(mid), 'utf-8')
message = byte_packet_id
h = hmac.HMAC(self.session_key, hashes.SHA256())
h.update(message)
signature = h.finalize()
#logger.log(logging.ERROR, "mac " + str(signature))
#logger.log(logging.INFO, b'Calculated HMAC of UNSUBACK:' + signature)
#logger.log(logging.INFO, b'Received HMAC of UNSUBACK:' + mac_real)
if (mac_real == signature):
logger.log(logging.INFO, "Signature of UNSUBACK is verified.")
self.unverified_unsuback_topics_list.append(True)
else:
logger.log(logging.ERROR, "Signature of UNSUBACK is not verified. Please try again to unsubscribe from the topic(s).")
self.unsuback_verified = False
self.unverified_unsuback_topics_list.append(False)
self.on_unsubscribe = on_unsubscribe
def subscribe4(self, client: mqtt, is_after_publish:bool, is_unsub:bool):
def on_message(client, userdata, msg):
receive_publish_time = time.time()
#print("----Publish message was received from broker")
#print(f"Encrypted payload: `{msg.payload}` from encrypted topic: `{msg.topic}` ")
logger.log(logging.INFO, "----Publish message was received from broker")
logger.log(logging.INFO, b'Encrypted payload: ' + msg.payload)
logger.log(logging.INFO, "Encrypted topic: " + msg.topic )
topic_hex = msg.topic
topic_byte = unhexlify(topic_hex)
backend = default_backend()
decryptor = Cipher(algorithms.AES(self.session_key), modes.ECB(), backend).decryptor()
padder = padding2.PKCS7(algorithms.AES(self.session_key).block_size).unpadder()
decrypted_data = decryptor.update(topic_byte)
unpadded = padder.update(decrypted_data) + padder.finalize()
#logger.log(logging.INFO, b'decrypted_data topic: ' + decrypted_data )
index1 = unpadded.index(b'::::')
topic_name = unpadded[0:index1]
mac_of_topic_name = unpadded[index1+4:]
topic_name_str = bytes.decode(topic_name)
if topic_name_str == self.id_client: #receiving bad mac here.
data = msg.payload
data_len = data[0:2]
actual_data = data[2:]
decryptor = Cipher(algorithms.AES(self.session_key), modes.ECB(), backend).decryptor()
padder = padding2.PKCS7(algorithms.AES(self.session_key).block_size).unpadder()
decrypted_data = decryptor.update(actual_data)
unpadded = padder.update(decrypted_data) + padder.finalize()
#logger.log(logging.INFO, b'decrypted_data payload: ' + decrypted_data )
#logger.log(logging.INFO, b'Dec payload received , unpadded= ' + unpadded)
index1 = unpadded.index(b'::::') #this added at 2 may - burcu
piece_1 = unpadded[0:index1]
piece_2 = unpadded[index1+4:]
index2 = piece_2.index(b'::::')
message_received = piece_2[0:index2]
mac_replacer = piece_2[index2+4:]
if piece_1 == bytes(self.id_client, 'utf-8') and message_received == b'signVerifyFailed':
self.fail_to_verify_mac = True
if is_after_publish:
#logger.log(logging.ERROR, "Received bad MAC, your published message won't be relayed to the subscribers.")
logger.log(logging.ERROR, "Received bad MAC message from broker")
#print("Received bad MAC, your published message won't be relayed to the subscribers.")
else:
if is_unsub:
self.received_badmac_unsub = True
#logger.log(logging.ERROR, "Received bad MAC, unsubscribe request failed.")
logger.log(logging.ERROR, "Received bad MAC message from broker")
print("Received bad MAC, unsubscribe request failed.")
else:
logger.log(logging.ERROR, "Received bad MAC message from broker")
print("Received bac MAC")
elif piece_1 == b'wildcardChoiceToken':
logger.log(logging.INFO, "CHOICE TOKEN FOR THE WILDCARD TOPIC AFTER DECRYPTION" )
piece_2 = unpadded[index1+4:]
index2 = piece_2.index(b'::::')
piece_topic = piece_2[0:index2]
piece_3 = piece_2[index2+4:]
index3 = piece_3.index(b'::::')
piece_choiceToken = piece_3[0:index3]
piece_mac = piece_3[index3+4:]
piece_topic = force_str(piece_topic)
piece_choiceToken = piece_choiceToken.hex()
self.choiceTokenDictionary[piece_topic] = piece_choiceToken