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https://github.com/LonamiWebs/Telethon.git
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Added authenticator
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Lonami
parent
e00a4e9b4b
commit
557ec70237
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@ -10,6 +10,7 @@ to make them entirely different.
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This project requires the following Python modules, which can be installed by issuing `sudo -H pip install <module>` on a
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Linux terminal:
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- `pyaes` ([GitHub](https://github.com/ricmoo/pyaes), [package index](https://pypi.python.org/pypi/pyaes))
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- `rsa` ([GitHub](https://github.com/sybrenstuvel/python-rsa), [package index](https://pypi.python.org/pypi/rsa))
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### We need your help!
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As of now, the project is fully **untested** and with many pending things to do. If you know both Python and C#, please don't
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207
network/authenticator.py
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207
network/authenticator.py
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@ -0,0 +1,207 @@
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# This file is based on TLSharp
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# https://github.com/sochix/TLSharp/blob/master/TLSharp.Core/Auth/Authenticator.cs
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# https://github.com/sochix/TLSharp/blob/master/TLSharp.Core/Auth/Step1_PQRequest.cs
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# https://github.com/sochix/TLSharp/blob/master/TLSharp.Core/Auth/Step2_DHExchange.cs
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# https://github.com/sochix/TLSharp/blob/master/TLSharp.Core/Auth/Step3_CompleteDHExchange.cs
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from network.mtproto_plain_sender import MtProtoPlainSender
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from utils.binary_writer import BinaryWriter
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from utils.binary_reader import BinaryReader
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from utils.factorizator import Factorizator
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from utils.auth_key import AuthKey
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from hashlib import sha1
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import utils.helpers as utils
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import time
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import pyaes
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import rsa
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def do_authentication(transport):
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sender = MtProtoPlainSender(transport)
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# Step 1 sending: PQ Request
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nonce = utils.generate_random_bytes(16)
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with BinaryWriter() as writer:
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writer.write_int(0x60469778) # Constructor number
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writer.write(nonce)
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sender.send(writer.get_bytes())
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# Step 1 response: PQ Request
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with BinaryReader(sender.receive()) as reader:
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response_code = reader.read_int()
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if response_code != 0x05162463:
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raise AssertionError('Invalid response code: {}'.format(hex(response_code)))
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nonce_from_server = reader.read(16)
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if nonce_from_server != nonce:
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raise AssertionError('Invalid nonce from server')
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server_nonce = reader.read(16)
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pq_bytes = reader.tgread_bytes()
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pq = int.from_bytes(pq_bytes, byteorder='big')
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vector_id = reader.read_int()
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if vector_id != 0x1cb5c415:
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raise AssertionError('Invalid vector constructor ID: {}'.format(hex(response_code)))
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fingerprints = []
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fingerprint_count = reader.read_int()
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for _ in range(fingerprint_count):
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fingerprints.append(reader.read(8))
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# Step 2 sending: DH Exchange
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new_nonce = utils.generate_random_bytes(32)
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p, q = Factorizator.factorize(pq)
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with BinaryWriter() as pq_inner_data_writer:
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pq_inner_data_writer.write_int(0x83c95aec) # PQ Inner Data
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pq_inner_data_writer.tgwrite_bytes(pq_bytes)
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# TODO, CHANGE TO_BYTE_ARRAY TO PACK(...); But idk size. And down too.
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pq_inner_data_writer.tgwrite_bytes(min(p, q).to_byte_array_unsigned())
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pq_inner_data_writer.tgwrite_bytes(max(p, q).to_byte_array_unsigned())
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pq_inner_data_writer.write(nonce)
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pq_inner_data_writer.write(server_nonce)
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pq_inner_data_writer.write(new_nonce)
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cipher_text = None
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for fingerprint in fingerprints:
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cipher_text = rsa.encrypt(str(fingerprint, encoding='utf-8').replace('-', ''),
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pq_inner_data_writer.get_bytes())
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if cipher_text is not None:
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target_fingerprint = fingerprint
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break
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if cipher_text is None:
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raise AssertionError('Could not find a valid key for fingerprints: {}'
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.format(', '.join([str(f, encoding='utf-8') for f in fingerprints])))
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with BinaryWriter() as req_dh_params_writer:
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req_dh_params_writer.write_int(0xd712e4be) # Req DH Params
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req_dh_params_writer.write(nonce)
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req_dh_params_writer.write(server_nonce)
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req_dh_params_writer.tgwrite_bytes(min(p, q).to_byte_array_unsigned())
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req_dh_params_writer.tgwrite_bytes(max(p, q).to_byte_array_unsigned())
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req_dh_params_writer.Write(target_fingerprint);
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req_dh_params_writer.tgwrite_bytes(cipher_text)
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req_dh_params_bytes = req_dh_params_writer.get_bytes();
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# Step 2 response: DH Exchange
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with BinaryReader(sender.receive()) as reader:
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response_code = reader.read_int()
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if response_code == 0x79cb045d:
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raise AssertionError('Server DH params fail: TODO')
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if response_code != 0xd0e8075c:
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raise AssertionError('Invalid response code: {}'.format(hex(response_code)))
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nonce_from_server = reader.read(16)
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# TODO:
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"""
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if nonce_from_server != nonce:
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print('Invalid nonce from server')
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return None
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"""
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server_nonce_from_server = reader.read(16)
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# TODO:
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"""
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if server_nonce_from_server != server_nonce:
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print('Invalid server nonce from server')
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return None
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"""
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encrypted_answer = reader.tgread_bytes()
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# Step 3 sending: Complete DH Exchange
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key, iv = utils.generate_key_data_from_nonces(server_nonce, new_nonce)
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aes = pyaes.AESModeOfOperationCFB(key, iv, 16)
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plain_text_answer = aes.decrypt(encrypted_answer)
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with BinaryReader(plain_text_answer.encode('ascii')) as dh_inner_data_reader:
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hashsum = dh_inner_data_reader.read(20)
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code = dh_inner_data_reader.read_int(signed=False)
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if code != 0xb5890dba:
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raise AssertionError('Invalid DH Inner Data code: {}'.format(code))
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nonce_from_server1 = dh_inner_data_reader.read(16)
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if nonce_from_server1 != nonce:
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raise AssertionError('Invalid nonce in encrypted answer')
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server_nonce_from_server1 = dh_inner_data_reader.read(16)
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if server_nonce_from_server1 != server_nonce:
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raise AssertionError('Invalid server nonce in encrypted answer')
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g = dh_inner_data_reader.read_int()
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dh_prime = int.from_bytes(dh_inner_data_reader.tgread_bytes(), byteorder='big')
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ga = int.from_bytes(dh_inner_data_reader.tgread_bytes(), byteorder='big')
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server_time = dh_inner_data_reader.read_int()
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time_offset = server_time - int(time.time())
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b = int.from_bytes(utils.generate_random_bytes(2048), byteorder='big')
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gb = pow(g, b, dh_prime) # BigInteger.ValueOf(g).ModPow(b, dhPrime)
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gab = pow(ga, b, dh_prime) # ga.ModPow(b, dhPrime)
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# Prepare client DH Inner Data
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with BinaryWriter() as client_dh_inner_data_writer:
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client_dh_inner_data_writer.write_int(0x6643b654) # Client DH Inner Data
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client_dh_inner_data_writer.write(nonce)
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client_dh_inner_data_writer.write(server_nonce)
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client_dh_inner_data_writer.write_long(0) # TODO retry_id
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client_dh_inner_data_writer.tgwrite_bytes(gb.to_byte_array_unsigned())
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with BinaryWriter() as client_dh_inner_data_with_hash_writer:
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client_dh_inner_data_with_hash_writer.write(sha1(client_dh_inner_data_writer.get_bytes()))
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client_dh_inner_data_with_hash_writer.write(client_dh_inner_data_writer.get_bytes())
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client_dh_inner_data_bytes = client_dh_inner_data_with_hash_writer.get_bytes()
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# Encryption
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client_dh_inner_data_encrypted_bytes = aes.encrypt(client_dh_inner_data_bytes)
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# Prepare Set client DH params
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with BinaryWriter() as set_client_dh_params_writer:
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set_client_dh_params_writer.write_int(0xf5045f1f)
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set_client_dh_params_writer.write(nonce)
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set_client_dh_params_writer.write(server_nonce)
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set_client_dh_params_writer.tgwrite_bytes(client_dh_inner_data_encrypted_bytes)
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set_client_dh_params_bytes = set_client_dh_params_writer.get_bytes()
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sender.send(set_client_dh_params_bytes)
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# Step 3 response: Complete DH Exchange
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with BinaryReader(sender.receive()) as reader:
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code = reader.read_int(signed=False)
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if code == 0x3bcbf734:
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nonce_from_server = reader.read(16)
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# TODO:
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"""
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if nonce_from_server != nonce:
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print('Invalid nonce from server')
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return None
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"""
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server_nonce_from_server = reader.read(16)
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# TODO:
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"""
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if server_nonce_from_server != server_nonce:
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print('Invalid server nonce from server')
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return None
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"""
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new_nonce_hash1 = reader.read(16)
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auth_key = AuthKey(gab)
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new_nonce_hash_calculated = auth_key.calc_new_nonce_hash(new_nonce, 1)
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if new_nonce_hash1 != new_nonce_hash_calculated:
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raise AssertionError('Invalid new nonce hash')
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return auth_key, time_offset
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elif code == 0x46dc1fb9: # DH Gen Retry
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raise NotImplementedError('dh_gen_retry')
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elif code == 0xa69dae02: # DH Gen Fail
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raise NotImplementedError('dh_gen_fail')
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else:
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raise AssertionError('DH Gen unknown: {}'.format(hex(code)))
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30
utils/auth_key.py
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30
utils/auth_key.py
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@ -0,0 +1,30 @@
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# This file is based on TLSharp
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# https://github.com/sochix/TLSharp/blob/master/TLSharp.Core/MTProto/Crypto/AuthKey.cs
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from hashlib import sha1
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from utils.binary_writer import BinaryWriter
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from utils.binary_reader import BinaryReader
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class AuthKey:
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def __init__(self, gab=None, data=None):
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if gab:
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self.key = gab.to_byte_array_unsigned()
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elif data:
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self.key = data
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else:
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raise AssertionError('Either a gab integer or data bytes array must be provided')
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with BinaryReader(sha1(self.key)) as reader:
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self.aux_hash = reader.read_long(signed=False)
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reader.read(4)
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self.key_id = reader.read_long(signed=False)
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def calc_new_nonce_hash(self, new_nonce, number):
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with BinaryWriter() as writer:
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writer.write(new_nonce)
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writer.write_byte(number)
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writer.write_long(self.aux_hash, signed=False)
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new_nonce_hash = sha1(writer.get_bytes())[4:20]
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return new_nonce_hash
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46
utils/factorizator.py
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46
utils/factorizator.py
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# This file is based on TLSharp
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# https://github.com/sochix/TLSharp/blob/master/TLSharp.Core/MTProto/Crypto/Factorizator.cs
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from random import randint
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from math import gcd
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class Factorizator:
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@staticmethod
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def find_small_multiplier_lopatin(what):
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g = 0
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for i in range(3):
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q = (randint(0, 127) & 15) + 17
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x = randint(1000000000) + 1
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y = x
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lim = 1 << (i + 18)
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for j in range(1, lim):
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a, b, c = x, x, q
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while b != 0:
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if (b & 1) != 0:
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c += a
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if c >= what:
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c -= what
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a += a
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if a >= what:
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a -= what
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b >>= 1
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x = c
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z = y - x if x < y else x - y
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g = gcd(z, what)
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if g != 1:
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break
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if (j & (j - 1)) == 0:
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y = x
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if g > 1:
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break
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p = what // g
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return min(p, g)
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@staticmethod
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def factorize(pq):
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divisor = Factorizator.find_small_multiplier_lopatin(pq)
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return divisor, pq // divisor
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@ -59,3 +59,40 @@ def calc_msg_key_offset(data, offset, limit):
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# TODO untested, may not be offset like this
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# In the original code it was as parameters for the sha function, not slicing the array
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return sha1(data[offset:offset + limit])[4:20]
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def generate_key_data_from_nonces(serverNonce, newNonce):
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# TODO unsure that this works
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nonces = [0] * 48
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nonces[00:32] = newNonce
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nonces[32:48] = serverNonce
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hash1 = hash(bytes(nonces))
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nonces[00:16] = serverNonce
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nonces[16:32] = newNonce
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hash2 = hash(bytes(nonces))
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nonces = [0] * 64
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nonces[00:32] = newNonce
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nonces[32:64] = newNonce
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hash2 = hash(bytes(nonces))
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with BinaryWriter() as keyBuffer:
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with BinaryWriter() as ivBuffer:
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"""
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using (var keyBuffer = new MemoryStream(32))
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using (var ivBuffer = new MemoryStream(32))
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{
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keyBuffer.Write(hash1, 0, hash1.Length);
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keyBuffer.Write(hash2, 0, 12);
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ivBuffer.Write(hash2, 12, 8);
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ivBuffer.Write(hash3, 0, hash3.Length);
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ivBuffer.Write(newNonce, 0, 4);
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return new AESKeyData(keyBuffer.ToArray(), ivBuffer.ToArray());
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}
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"""
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# TODO implement
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raise NotImplementedError()
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