def pack_auth_data(self, auth_data, buf):
data = auth_data
data = data + (struct.pack('<H', self.server_info.overhead) + struct.pack('<H', 0))
mac_key = self.server_info.iv + self.server_info.key
check_head = rand_bytes(4)
self.last_client_hash = hmac.new(mac_key, check_head, self.hashfunc).digest()
check_head += self.last_client_hash[:8]
if b':' in to_bytes(self.server_info.protocol_param):
try:
items = to_bytes(self.server_info.protocol_param).split(b':')
self.user_key = items[1]
uid = struct.pack('<I', int(items[0]))
except:
uid = rand_bytes(4)
else:
uid = rand_bytes(4)
if self.user_key is None:
self.user_key = self.server_info.key
encryptor = encrypt.Encryptor(
to_bytes(base64.b64encode(self.user_key)) + self.salt, 'aes-128-cbc', b'\x00' * 16)
uid = struct.unpack('<I', uid)[0] ^ struct.unpack('<I', self.last_client_hash[8:12])[0]
uid = struct.pack('<I', uid)
data = uid + encryptor.encrypt(data)[16:]
self.last_server_hash = hmac.new(self.user_key, data, self.hashfunc).digest()
data = check_head + data + self.last_server_hash[:4]
self.encryptor = encrypt.Encryptor(
to_bytes(base64.b64encode(self.user_key)) + to_bytes(base64.b64encode(self.last_client_hash)), 'rc4')
return data + self.pack_client_data(buf)
def pack_auth_data(self, auth_data, buf):
if len(buf) == 0:
return b''
if len(buf) > 400:
rnd_len = struct.unpack('<H', os.urandom(2))[0] % 512
else:
rnd_len = struct.unpack('<H', os.urandom(2))[0] % 1024
data = auth_data
data_len = 7 + 4 + 16 + 4 + len(buf) + rnd_len + 4
data = data + struct.pack('<H', data_len) + struct.pack('<H', rnd_len)
mac_key = self.server_info.iv + self.server_info.key
uid = os.urandom(4)
if b':' in to_bytes(self.server_info.protocol_param):
try:
items = to_bytes(self.server_info.protocol_param).split(b':')
self.user_key = self.hashfunc(items[1]).digest()
uid = struct.pack('<I', int(items[0]))
except:
pass
if self.user_key is None:
self.user_key = self.server_info.key
encryptor = encrypt.Encryptor(
to_bytes(base64.b64encode(self.user_key)) + self.salt,
'aes-128-cbc', b'\x00' * 16)
data = uid + encryptor.encrypt(data)[16:]
data += hmac.new(mac_key, data, self.hashfunc).digest()[:4]
check_head = os.urandom(1)
check_head += hmac.new(mac_key, check_head, self.hashfunc).digest()[:6]
data = check_head + data + os.urandom(rnd_len) + buf
data += hmac.new(self.user_key, data, self.hashfunc).digest()[:4]
return data
def client_udp_post_decrypt(self, buf):
if len(buf) <= 8:
return (b'', None)
if hmac.new(self.user_key, buf[:-1], self.hashfunc).digest()[:1] != buf[-1:]:
return (b'', None)
mac_key = self.server_info.key
md5data = hmac.new(mac_key, buf[-8:-1], self.hashfunc).digest()
rand_len = self.udp_rnd_data_len(md5data, self.random_server)
encryptor = encrypt.Encryptor(
to_bytes(base64.b64encode(self.user_key)) + to_bytes(base64.b64encode(md5data)), 'rc4')
return encryptor.decrypt(buf[:-8 - rand_len])
def server_udp_pre_encrypt(self, buf, uid):
if uid in self.server_info.users:
user_key = self.server_info.users[uid]
else:
uid = None
if not self.server_info.users:
user_key = self.server_info.key
else:
user_key = self.server_info.recv_iv
authdata = rand_bytes(7)
mac_key = self.server_info.key
md5data = hmac.new(mac_key, authdata, self.hashfunc).digest()
rand_len = self.udp_rnd_data_len(md5data, self.random_server)
encryptor = encrypt.Encryptor(to_bytes(base64.b64encode(user_key)) + to_bytes(base64.b64encode(md5data)), 'rc4')
out_buf = encryptor.encrypt(buf)
buf = out_buf + rand_bytes(rand_len) + authdata
return buf + hmac.new(user_key, buf, self.hashfunc).digest()[:1]
def server_udp_post_decrypt(self, buf):
mac_key = self.server_info.key
md5data = hmac.new(mac_key, buf[-8:-5], self.hashfunc).digest()
uid = struct.unpack('<I', buf[-5:-1])[0] ^ struct.unpack('<I', md5data[:4])[0]
uid = struct.pack('<I', uid)
if uid in self.server_info.users:
user_key = self.server_info.users[uid]
else:
uid = None
if not self.server_info.users:
user_key = self.server_info.key
else:
user_key = self.server_info.recv_iv
if hmac.new(user_key, buf[:-1], self.hashfunc).digest()[:1] != buf[-1:]:
return (b'', None)
rand_len = self.udp_rnd_data_len(md5data, self.random_client)
encryptor = encrypt.Encryptor(to_bytes(base64.b64encode(user_key)) + to_bytes(base64.b64encode(md5data)), 'rc4')
out_buf = encryptor.decrypt(buf[:-8 - rand_len])
return (out_buf, uid)
def client_udp_pre_encrypt(self, buf):
if self.user_key is None:
if b':' in to_bytes(self.server_info.protocol_param):
try:
items = to_bytes(self.server_info.protocol_param).split(':')
self.user_key = self.hashfunc(items[1]).digest()
self.user_id = struct.pack('<I', int(items[0]))
except:
pass
if self.user_key is None:
self.user_id = rand_bytes(4)
self.user_key = self.server_info.key
authdata = rand_bytes(3)
mac_key = self.server_info.key
md5data = hmac.new(mac_key, authdata, self.hashfunc).digest()
uid = struct.unpack('<I', self.user_id)[0] ^ struct.unpack('<I', md5data[:4])[0]
uid = struct.pack('<I', uid)
rand_len = self.udp_rnd_data_len(md5data, self.random_client)
encryptor = encrypt.Encryptor(
to_bytes(base64.b64encode(self.user_key)) + to_bytes(base64.b64encode(md5data)), 'rc4')
out_buf = encryptor.encrypt(buf)
buf = out_buf + rand_bytes(rand_len) + authdata + uid
return buf + hmac.new(self.user_key, buf, self.hashfunc).digest()[:1]
def server_post_decrypt(self, buf):
if self.raw_trans:
return (buf, False)
self.recv_buf += buf
out_buf = b''
sendback = False
if not self.has_recv_header:
if len(self.recv_buf) >= 12 or len(self.recv_buf) in [7, 8]:
recv_len = min(len(self.recv_buf), 12)
mac_key = self.server_info.recv_iv + self.server_info.key
md5data = hmac.new(mac_key, self.recv_buf[:4], self.hashfunc).digest()
if md5data[:recv_len - 4] != self.recv_buf[4:recv_len]:
return self.not_match_return(self.recv_buf)
if len(self.recv_buf) < 12 + 24:
return (b'', False)
self.last_client_hash = md5data
uid = struct.unpack('<I', self.recv_buf[12:16])[0] ^ struct.unpack('<I', md5data[8:12])[0]
self.user_id_num = uid
uid = struct.pack('<I', uid)
if uid in self.server_info.users:
self.user_id = uid
self.user_key = self.server_info.users[uid]
self.server_info.update_user_func(uid)
else:
self.user_id_num = 0
if not self.server_info.users:
self.user_key = self.server_info.key
else:
self.user_key = self.server_info.recv_iv
md5data = hmac.new(self.user_key, self.recv_buf[12: 12 + 20], self.hashfunc).digest()
if md5data[:4] != self.recv_buf[32:36]:
logging.error('%s data uncorrect auth HMAC-MD5 from %s:%d, data %s' % (
self.no_compatible_method, self.server_info.client, self.server_info.client_port,
binascii.hexlify(self.recv_buf)
))
if len(self.recv_buf) < 36:
return (b'', False)
return self.not_match_return(self.recv_buf)
self.last_server_hash = md5data
encryptor = encrypt.Encryptor(to_bytes(base64.b64encode(self.user_key)) + self.salt, 'aes-128-cbc')
head = encryptor.decrypt(b'\x00' * 16 + self.recv_buf[16:32] + b'\x00') # need an extra byte or recv empty
self.client_over_head = struct.unpack('<H', head[12:14])[0]
utc_time = struct.unpack('<I', head[:4])[0]
client_id = struct.unpack('<I', head[4:8])[0]
connection_id = struct.unpack('<I', head[8:12])[0]
time_dif = common.int32(utc_time - (int(time.time()) & 0xffffffff))
if time_dif < -self.max_time_dif or time_dif > self.max_time_dif:
logging.info('%s: wrong timestamp, time_dif %d, data %s' % (
self.no_compatible_method, time_dif, binascii.hexlify(head)
))
return self.not_match_return(self.recv_buf)
elif self.server_info.data.insert(self.user_id, client_id, connection_id):
self.has_recv_header = True
self.client_id = client_id
self.connection_id = connection_id
else:
logging.info('%s: auth fail, data %s' % (self.no_compatible_method, binascii.hexlify(out_buf)))
return self.not_match_return(self.recv_buf)
self.on_recv_auth_data(utc_time)
self.encryptor = encrypt.Encryptor(
to_bytes(base64.b64encode(self.user_key)) + to_bytes(base64.b64encode(self.last_client_hash)), 'rc4')
self.recv_buf = self.recv_buf[36:]
self.has_recv_header = True
sendback = True
while len(self.recv_buf) > 4:
mac_key = self.user_key + struct.pack('<I', self.recv_id)
data_len = struct.unpack('<H', self.recv_buf[:2])[0] ^ struct.unpack('<H', self.last_client_hash[14:16])[0]
rand_len = self.rnd_data_len(data_len, self.last_client_hash, self.random_client)
length = data_len + rand_len
if length >= 4096:
self.raw_trans = True
self.recv_buf = b''
if self.recv_id == 1:
logging.info(self.no_compatible_method + ': over size')
return (b'E' * 2048, False)
else:
raise Exception('server_post_decrype data error')
if length + 4 > len(self.recv_buf):
break
client_hash = hmac.new(mac_key, self.recv_buf[:length + 2], self.hashfunc).digest()
if client_hash[:2] != self.recv_buf[length + 2: length + 4]:
logging.info('%s: checksum error, data %s' % (
self.no_compatible_method, binascii.hexlify(self.recv_buf[:length])
))
self.raw_trans = True
self.recv_buf = b''
if self.recv_id == 1:
return (b'E' * 2048, False)
else:
raise Exception('server_post_decrype data uncorrect checksum')
self.recv_id = (self.recv_id + 1) & 0xFFFFFFFF
pos = 2
if data_len > 0 and rand_len > 0:
pos = 2 + self.rnd_start_pos(rand_len, self.random_client)
out_buf += self.encryptor.decrypt(self.recv_buf[pos: data_len + pos])
self.last_client_hash = client_hash
self.recv_buf = self.recv_buf[length + 4:]
if data_len == 0:
sendback = True
if out_buf:
self.server_info.data.update(self.user_id, self.client_id, self.connection_id)
return (out_buf, sendback)
def server_post_decrypt(self, buf):
if self.raw_trans:
return (buf, False)
self.recv_buf += buf
out_buf = b''
sendback = False
if not self.has_recv_header:
if len(self.recv_buf) >= 7 or len(self.recv_buf) in [2, 3]:
recv_len = min(len(self.recv_buf), 7)
mac_key = self.server_info.recv_iv + self.server_info.key
sha1data = hmac.new(mac_key, self.recv_buf[:1],
self.hashfunc).digest()[:recv_len - 1]
if sha1data != self.recv_buf[1:recv_len]:
return self.not_match_return(self.recv_buf)
if len(self.recv_buf) < 31:
return (b'', False)
sha1data = hmac.new(mac_key, self.recv_buf[7:27],
self.hashfunc).digest()[:4]
if sha1data != self.recv_buf[27:31]:
logging.error(
'%s data uncorrect auth HMAC-SHA1 from %s:%d, data %s' %
(self.no_compatible_method, self.server_info.client,
self.server_info.client_port,
binascii.hexlify(self.recv_buf)))
if len(self.recv_buf) < 31 + self.extra_wait_size:
return (b'', False)
return self.not_match_return(self.recv_buf)
uid = self.recv_buf[7:11]
if uid in self.server_info.users:
self.user_id = uid
self.user_key = self.hashfunc(
self.server_info.users[uid]).digest()
self.server_info.update_user_func(uid)
else:
if not self.server_info.users:
self.user_key = self.server_info.key
else:
self.user_key = self.server_info.recv_iv
encryptor = encrypt.Encryptor(
to_bytes(base64.b64encode(self.user_key)) + self.salt,
'aes-128-cbc')
head = encryptor.decrypt(
b'\x00' * 16 + self.recv_buf[11:27] +
b'\x00') # need an extra byte or recv empty
length = struct.unpack('<H', head[12:14])[0]
if len(self.recv_buf) < length:
return (b'', False)
utc_time = struct.unpack('<I', head[:4])[0]
client_id = struct.unpack('<I', head[4:8])[0]
connection_id = struct.unpack('<I', head[8:12])[0]
rnd_len = struct.unpack('<H', head[14:16])[0]
if hmac.new(self.user_key, self.recv_buf[:length - 4],
self.hashfunc).digest()[:4] != self.recv_buf[length -
4:length]:
logging.info('%s: checksum error, data %s' %
(self.no_compatible_method,
binascii.hexlify(self.recv_buf[:length])))
return self.not_match_return(self.recv_buf)
time_dif = common.int32(utc_time - (int(time.time()) & 0xffffffff))
if time_dif < -self.max_time_dif or time_dif > self.max_time_dif:
logging.info('%s: wrong timestamp, time_dif %d, data %s' %
(self.no_compatible_method, time_dif,
binascii.hexlify(head)))
return self.not_match_return(self.recv_buf)
elif self.server_info.data.insert(self.user_id, client_id,
connection_id):
self.has_recv_header = True
out_buf = self.recv_buf[31 + rnd_len:length - 4]
self.client_id = client_id
self.connection_id = connection_id
else:
logging.info(
'%s: auth fail, data %s' %
(self.no_compatible_method, binascii.hexlify(out_buf)))
return self.not_match_return(self.recv_buf)
self.recv_buf = self.recv_buf[length:]
self.has_recv_header = True
sendback = True
while len(self.recv_buf) > 4:
mac_key = self.user_key + struct.pack('<I', self.recv_id)
mac = hmac.new(mac_key, self.recv_buf[:2],
self.hashfunc).digest()[:2]
if mac != self.recv_buf[2:4]:
self.raw_trans = True
logging.info(self.no_compatible_method + ': wrong crc')
if self.recv_id == 0:
logging.info(self.no_compatible_method + ': wrong crc')
return (b'E' * 2048, False)
else:
raise Exception('server_post_decrype data error')
length = struct.unpack('<H', self.recv_buf[:2])[0]
if length >= 8192 or length < 7:
self.raw_trans = True
self.recv_buf = b''
if self.recv_id == 0:
logging.info(self.no_compatible_method + ': over size')
return (b'E' * 2048, False)
else:
raise Exception('server_post_decrype data error')
if length > len(self.recv_buf):
break
if hmac.new(mac_key, self.recv_buf[:length - 4],
self.hashfunc).digest()[:4] != self.recv_buf[length -
4:length]:
logging.info('%s: checksum error, data %s' %
(self.no_compatible_method,
binascii.hexlify(self.recv_buf[:length])))
self.raw_trans = True
self.recv_buf = b''
if self.recv_id == 0:
return (b'E' * 2048, False)
else:
raise Exception(
'server_post_decrype data uncorrect checksum')
self.recv_id = (self.recv_id + 1) & 0xFFFFFFFF
pos = common.ord(self.recv_buf[4])
if pos < 255:
pos += 4
else:
pos = struct.unpack('<H', self.recv_buf[5:7])[0] + 4
out_buf += self.recv_buf[pos:length - 4]
self.recv_buf = self.recv_buf[length:]
if pos == length - 4:
sendback = True
if out_buf:
self.server_info.data.update(self.user_id, self.client_id,
self.connection_id)
return (out_buf, sendback)