mirror of
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51 lines
1.9 KiB
Python
51 lines
1.9 KiB
Python
import os
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from datetime import timedelta
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from .tcpfull import ConnectionTcpFull
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from .tcpabridged import ConnectionTcpAbridged
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from ...crypto import AESModeCTR
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class ConnectionTcpObfuscated(ConnectionTcpAbridged):
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"""
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Encodes the packet just like `ConnectionTcpAbridged`, but encrypts
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every message with a randomly generated key using the
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AES-CTR mode so the packets are harder to discern.
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"""
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def __init__(self, proxy=None, timeout=timedelta(seconds=5)):
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super().__init__(proxy, timeout)
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self._aes_encrypt, self._aes_decrypt = None, None
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self.read = lambda s: self._aes_decrypt.encrypt(self.conn.read(s))
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self.write = lambda d: self.conn.write(self._aes_encrypt.encrypt(d))
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def connect(self, ip, port):
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result = ConnectionTcpFull.connect(self, ip, port)
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# Obfuscated messages secrets cannot start with any of these
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keywords = (b'PVrG', b'GET ', b'POST', b'\xee' * 4)
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while True:
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random = os.urandom(64)
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if (random[0] != b'\xef' and
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random[:4] not in keywords and
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random[4:4] != b'\0\0\0\0'):
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break
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random = list(random)
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random[56] = random[57] = random[58] = random[59] = 0xef
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random_reversed = random[55:7:-1] # Reversed (8, len=48)
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# encryption has "continuous buffer" enabled
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encrypt_key = bytes(random[8:40])
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encrypt_iv = bytes(random[40:56])
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decrypt_key = bytes(random_reversed[:32])
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decrypt_iv = bytes(random_reversed[32:48])
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self._aes_encrypt = AESModeCTR(encrypt_key, encrypt_iv)
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self._aes_decrypt = AESModeCTR(decrypt_key, decrypt_iv)
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random[56:64] = self._aes_encrypt.encrypt(bytes(random))[56:64]
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self.conn.write(bytes(random))
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return result
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def clone(self):
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return ConnectionTcpObfuscated(self._proxy, self._timeout)
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