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from __future__ import annotations
import asyncio
import logging
import time
from hashlib import sha1
from io import BytesIO
from os import urandom
from typing import TYPE_CHECKING, cast
import pyrogram
from pyrogram import raw
from pyrogram.crypto import aes, prime, rsa
from pyrogram.errors import SecurityCheckMismatch
from pyrogram.raw.core import Int, Long, TLObject
from .internals import MsgId
if TYPE_CHECKING:
from pyrogram.connection import Connection
from pyrogram.connection.transport import Proxy
log = logging.getLogger(__name__)
class Auth:
MAX_RETRIES = 5
def __init__(self, client: pyrogram.Client, dc_id: int, test_mode: bool) -> None:
self.dc_id = dc_id
self.test_mode = test_mode
self.ipv6 = client.ipv6
self.alt_port = client.alt_port
self.proxy = client.proxy
self.connection_factory = client.connection_factory
self.protocol_factory = client.protocol_factory
self.connection: Connection | None = None
@staticmethod
def pack(data: TLObject) -> bytes:
return bytes(8) + Long(MsgId()) + Int(len(data.write())) + data.write()
@staticmethod
def unpack(b: BytesIO):
b.seek(20)
return TLObject.read(b)
async def invoke(self, data: TLObject):
packed_data = self.pack(data)
await self.connection.send(packed_data)
response = await self.connection.recv()
if response is None:
raise ConnectionError("Disconnected while receiving")
return self.unpack(BytesIO(response))
async def create(self):
"""
https://core.telegram.org/mtproto/auth_key
https://core.telegram.org/mtproto/samples-auth_key
"""
retries_left = self.MAX_RETRIES
while True:
self.connection = self.connection_factory(
dc_id=self.dc_id,
test_mode=self.test_mode,
ipv6=self.ipv6,
alt_port=self.alt_port,
proxy=cast("Proxy", self.proxy),
media=False,
protocol_factory=self.protocol_factory,
)
try:
log.info("Start creating a new auth key on DC%s", self.dc_id)
await self.connection.connect()
nonce = int.from_bytes(urandom(16), "little", signed=True)
log.debug("Send req_pq: %s", nonce)
res_pq = await self.invoke(raw.functions.ReqPqMulti(nonce=nonce))
log.debug("Got ResPq: %s", res_pq.server_nonce)
log.debug(
"Server public key fingerprints: %s",
res_pq.server_public_key_fingerprints,
)
for i in res_pq.server_public_key_fingerprints:
if i in rsa.server_public_keys:
log.debug("Using fingerprint: %s", i)
public_key_fingerprint = i
break
log.debug("Fingerprint unknown: %s", i)
else:
raise Exception("Public key not found")
pq = int.from_bytes(res_pq.pq, "big")
log.debug("Start PQ factorization: %s", pq)
start = time.time()
g = prime.decompose(pq)
p, q = sorted((g, pq // g))
log.debug(
"Done PQ factorization (%ss): %s %s",
round(time.time() - start, 3),
p,
q,
)
server_nonce = res_pq.server_nonce
new_nonce = int.from_bytes(urandom(32), "little", signed=True)
data = raw.types.PQInnerData(
pq=res_pq.pq,
p=p.to_bytes(4, "big"),
q=q.to_bytes(4, "big"),
nonce=nonce,
server_nonce=server_nonce,
new_nonce=new_nonce,
).write()
sha = sha1(data).digest()
padding = urandom(-(len(data) + len(sha)) % 255)
data_with_hash = sha + data + padding
encrypted_data = rsa.encrypt(data_with_hash, public_key_fingerprint)
log.debug("Done encrypt data with RSA")
log.debug("Send req_DH_params")
server_dh_params = await self.invoke(
raw.functions.ReqDHParams(
nonce=nonce,
server_nonce=server_nonce,
p=p.to_bytes(4, "big"),
q=q.to_bytes(4, "big"),
public_key_fingerprint=public_key_fingerprint,
encrypted_data=encrypted_data,
),
)
encrypted_answer = server_dh_params.encrypted_answer
server_nonce = server_nonce.to_bytes(16, "little", signed=True)
new_nonce = new_nonce.to_bytes(32, "little", signed=True)
tmp_aes_key = (
sha1(new_nonce + server_nonce).digest()
+ sha1(server_nonce + new_nonce).digest()[:12]
)
tmp_aes_iv = (
sha1(server_nonce + new_nonce).digest()[12:]
+ sha1(new_nonce + new_nonce).digest()
+ new_nonce[:4]
)
server_nonce = int.from_bytes(server_nonce, "little", signed=True)
answer_with_hash = aes.ige256_decrypt(
encrypted_answer,
tmp_aes_key,
tmp_aes_iv,
)
answer = answer_with_hash[20:]
server_dh_inner_data = TLObject.read(BytesIO(answer))
log.debug("Done decrypting answer")
dh_prime = int.from_bytes(server_dh_inner_data.dh_prime, "big")
delta_time = server_dh_inner_data.server_time - time.time()
log.debug("Delta time: %s", round(delta_time, 3))
g = server_dh_inner_data.g
b = int.from_bytes(urandom(256), "big")
g_b = pow(g, b, dh_prime).to_bytes(256, "big")
retry_id = 0
data = raw.types.ClientDHInnerData(
nonce=nonce,
server_nonce=server_nonce,
retry_id=retry_id,
g_b=g_b,
).write()
sha = sha1(data).digest()
padding = urandom(-(len(data) + len(sha)) % 16)
data_with_hash = sha + data + padding
encrypted_data = aes.ige256_encrypt(
data_with_hash,
tmp_aes_key,
tmp_aes_iv,
)
log.debug("Send set_client_DH_params")
set_client_dh_params_answer = await self.invoke(
raw.functions.SetClientDHParams(
nonce=nonce,
server_nonce=server_nonce,
encrypted_data=encrypted_data,
),
)
g_a = int.from_bytes(server_dh_inner_data.g_a, "big")
auth_key = pow(g_a, b, dh_prime).to_bytes(256, "big")
server_nonce = server_nonce.to_bytes(16, "little", signed=True)
SecurityCheckMismatch.check(
dh_prime == prime.CURRENT_DH_PRIME,
"dh_prime == prime.CURRENT_DH_PRIME",
)
log.debug("DH parameters check: OK")
g_b = int.from_bytes(g_b, "big")
SecurityCheckMismatch.check(
1 < g < dh_prime - 1,
"1 < g < dh_prime - 1",
)
SecurityCheckMismatch.check(
1 < g_a < dh_prime - 1,
"1 < g_a < dh_prime - 1",
)
SecurityCheckMismatch.check(
1 < g_b < dh_prime - 1,
"1 < g_b < dh_prime - 1",
)
SecurityCheckMismatch.check(
2 ** (2048 - 64) < g_a < dh_prime - 2 ** (2048 - 64),
"2 ** (2048 - 64) < g_a < dh_prime - 2 ** (2048 - 64)",
)
SecurityCheckMismatch.check(
2 ** (2048 - 64) < g_b < dh_prime - 2 ** (2048 - 64),
"2 ** (2048 - 64) < g_b < dh_prime - 2 ** (2048 - 64)",
)
log.debug("g_a and g_b validation: OK")
answer = server_dh_inner_data.write()
SecurityCheckMismatch.check(
answer_with_hash[:20] == sha1(answer).digest(),
"answer_with_hash[:20] == sha1(answer).digest()",
)
log.debug("SHA1 hash values check: OK")
SecurityCheckMismatch.check(
nonce == res_pq.nonce,
"nonce == res_pq.nonce",
)
server_nonce = int.from_bytes(server_nonce, "little", signed=True)
SecurityCheckMismatch.check(
nonce == server_dh_params.nonce,
"nonce == server_dh_params.nonce",
)
SecurityCheckMismatch.check(
server_nonce == server_dh_params.server_nonce,
"server_nonce == server_dh_params.server_nonce",
)
SecurityCheckMismatch.check(
nonce == set_client_dh_params_answer.nonce,
"nonce == set_client_dh_params_answer.nonce",
)
SecurityCheckMismatch.check(
server_nonce == set_client_dh_params_answer.server_nonce,
"server_nonce == set_client_dh_params_answer.server_nonce",
)
server_nonce = server_nonce.to_bytes(16, "little", signed=True)
log.debug("Nonce fields check: OK")
server_salt = aes.xor(new_nonce[:8], server_nonce[:8])
log.debug("Server salt: %s", int.from_bytes(server_salt, "little"))
log.info(
"Done auth key exchange: %s",
set_client_dh_params_answer.__class__.__name__,
)
except Exception as e:
log.info("Retrying due to %s: %s", type(e).__name__, e)
if retries_left:
retries_left -= 1
else:
raise e
await asyncio.sleep(1)
continue
else:
return auth_key
finally:
await self.connection.close()