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decode_mars_crypt_log_file.py
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decode_mars_crypt_log_file.py
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#!/usr/bin/python
import sys
import os
import glob
import zlib
import struct
import binascii
import pyelliptic
import traceback
import zstandard as zstd
MAGIC_NO_COMPRESS_START = 0x03
MAGIC_NO_COMPRESS_START1 = 0x06
MAGIC_NO_COMPRESS_NO_CRYPT_START = 0x08
MAGIC_COMPRESS_START = 0x04
MAGIC_COMPRESS_START1 = 0x05
MAGIC_COMPRESS_START2 = 0x07
MAGIC_COMPRESS_NO_CRYPT_START = 0x09
MAGIC_SYNC_ZSTD_START = 0x0A
MAGIC_SYNC_NO_CRYPT_ZSTD_START = 0x0B
MAGIC_ASYNC_ZSTD_START = 0x0C
MAGIC_ASYNC_NO_CRYPT_ZSTD_START = 0x0D
MAGIC_END = 0x00
lastseq = 0
class ZstdDecompressReader:
def __init__(self, buffer):
self.buffer = buffer
def read(self, size):
return self.buffer
PRIV_KEY = "145aa7717bf9745b91e9569b80bbf1eedaa6cc6cd0e26317d810e35710f44cf8"
PUB_KEY = "572d1e2710ae5fbca54c76a382fdd44050b3a675cb2bf39feebe85ef63d947aff0fa4943f1112e8b6af34bebebbaefa1a0aae055d9259b89a1858f7cc9af9df1"
def tea_decipher(v, k):
op = 0xffffffff
v0, v1 = struct.unpack('=LL', v[0:8])
k1, k2, k3, k4 = struct.unpack('=LLLL', k[0:16])
delta = 0x9E3779B9
s = (delta << 4) & op
for i in xrange(16):
v1 = (v1 - (((v0 << 4) + k3) ^ (v0 + s) ^ ((v0 >> 5) + k4))) & op
v0 = (v0 - (((v1 << 4) + k1) ^ (v1 + s) ^ ((v1 >> 5) + k2))) & op
s = (s - delta) & op
return struct.pack('=LL', v0, v1)
def tea_decrypt(v, k):
num = len(v) / 8 * 8
ret = ''
for i in xrange(0, num, 8):
x = tea_decipher(v[i:i + 8], k)
ret += x
ret += v[num:]
return ret
def IsGoodLogBuffer(_buffer, _offset, count):
if _offset == len(_buffer): return (True, '')
magic_start = _buffer[_offset]
if MAGIC_NO_COMPRESS_START == magic_start or MAGIC_COMPRESS_START == magic_start or MAGIC_COMPRESS_START1 == magic_start:
crypt_key_len = 4
elif MAGIC_COMPRESS_START2==magic_start or MAGIC_NO_COMPRESS_START1==magic_start or MAGIC_NO_COMPRESS_NO_CRYPT_START==magic_start or MAGIC_COMPRESS_NO_CRYPT_START==magic_start \
or MAGIC_SYNC_ZSTD_START == magic_start or MAGIC_SYNC_NO_CRYPT_ZSTD_START == magic_start or MAGIC_ASYNC_ZSTD_START == magic_start or MAGIC_ASYNC_NO_CRYPT_ZSTD_START == magic_start:
crypt_key_len = 64
else:
return (False, '_buffer[%d]:%d != MAGIC_NUM_START' % (_offset, _buffer[_offset]))
headerLen = 1 + 2 + 1 + 1 + 4 + crypt_key_len
if _offset + headerLen + 1 + 1 > len(_buffer):
return (False, 'offset:%d > len(buffer):%d' % (_offset, len(_buffer)))
length = struct.unpack_from("I", buffer(_buffer, _offset + headerLen - 4 - crypt_key_len, 4))[0]
if _offset + headerLen + length + 1 > len(_buffer):
return (False,
'log length:%d, end pos %d > len(buffer):%d' % (length, _offset + headerLen + length + 1, len(_buffer)))
if MAGIC_END != _buffer[_offset + headerLen + length]:
return (False, 'log length:%d, buffer[%d]:%d != MAGIC_END' %
(length, _offset + headerLen + length, _buffer[_offset + headerLen + length]))
if (1 >= count): return (True, '')
else: return IsGoodLogBuffer(_buffer, _offset + headerLen + length + 1, count - 1)
def GetLogStartPos(_buffer, _count):
offset = 0
while True:
if offset >= len(_buffer): break
if MAGIC_NO_COMPRESS_START==_buffer[offset] or MAGIC_NO_COMPRESS_START1==_buffer[offset] or MAGIC_COMPRESS_START==_buffer[offset] or MAGIC_COMPRESS_START1==_buffer[offset] or MAGIC_COMPRESS_START2==_buffer[offset] or MAGIC_COMPRESS_NO_CRYPT_START==_buffer[offset] or MAGIC_NO_COMPRESS_NO_CRYPT_START==_buffer[offset]\
or MAGIC_SYNC_ZSTD_START == _buffer[offset] or MAGIC_SYNC_NO_CRYPT_ZSTD_START == _buffer[offset] or MAGIC_ASYNC_ZSTD_START == _buffer[offset] or MAGIC_ASYNC_NO_CRYPT_ZSTD_START == _buffer[offset]:
if IsGoodLogBuffer(_buffer, offset, _count)[0]: return offset
offset += 1
return -1
def DecodeBuffer(_buffer, _offset, _outbuffer):
if _offset >= len(_buffer): return -1
# if _offset + 1 + 4 + 1 + 1 > len(_buffer): return -1
ret = IsGoodLogBuffer(_buffer, _offset, 1)
if not ret[0]:
fixpos = GetLogStartPos(_buffer[_offset:], 1)
if -1 == fixpos:
return -1
else:
_outbuffer.extend("[F]decode_log_file.py decode error len=%d, result:%s \n" % (fixpos, ret[1]))
_offset += fixpos
magic_start = _buffer[_offset]
if MAGIC_NO_COMPRESS_START == magic_start or MAGIC_COMPRESS_START == magic_start or MAGIC_COMPRESS_START1 == magic_start:
crypt_key_len = 4
elif MAGIC_COMPRESS_START2==magic_start or MAGIC_NO_COMPRESS_START1==magic_start or MAGIC_NO_COMPRESS_NO_CRYPT_START==magic_start or MAGIC_COMPRESS_NO_CRYPT_START==magic_start\
or MAGIC_SYNC_ZSTD_START == magic_start or MAGIC_SYNC_NO_CRYPT_ZSTD_START == magic_start or MAGIC_ASYNC_ZSTD_START == magic_start or MAGIC_ASYNC_NO_CRYPT_ZSTD_START == magic_start:
crypt_key_len = 64
else:
_outbuffer.extend('in DecodeBuffer _buffer[%d]:%d != MAGIC_NUM_START' % (_offset, magic_start))
return -1
headerLen = 1 + 2 + 1 + 1 + 4 + crypt_key_len
length = struct.unpack_from("I", buffer(_buffer, _offset + headerLen - 4 - crypt_key_len, 4))[0]
tmpbuffer = bytearray(length)
seq = struct.unpack_from("H", buffer(_buffer, _offset + headerLen - 4 - crypt_key_len - 2 - 2, 2))[0]
begin_hour = struct.unpack_from("c", buffer(_buffer, _offset + headerLen - 4 - crypt_key_len - 1 - 1, 1))[0]
end_hour = struct.unpack_from("c", buffer(_buffer, _offset + headerLen - 4 - crypt_key_len - 1, 1))[0]
global lastseq
if seq != 0 and seq != 1 and lastseq != 0 and seq != (lastseq + 1):
_outbuffer.extend("[F]decode_log_file.py log seq:%d-%d is missing\n" % (lastseq + 1, seq - 1))
if seq != 0:
lastseq = seq
tmpbuffer[:] = _buffer[_offset + headerLen:_offset + headerLen + length]
try:
if MAGIC_NO_COMPRESS_START1 == _buffer[_offset] or MAGIC_SYNC_ZSTD_START == _buffer[_offset]:
pass
elif MAGIC_COMPRESS_START2 == _buffer[_offset] or MAGIC_ASYNC_ZSTD_START == _buffer[_offset]:
svr = pyelliptic.ECC(curve='secp256k1')
client = pyelliptic.ECC(curve='secp256k1')
client.pubkey_x = str(buffer(_buffer, _offset + headerLen - crypt_key_len, crypt_key_len / 2))
client.pubkey_y = str(buffer(_buffer, _offset + headerLen - crypt_key_len / 2, crypt_key_len / 2))
svr.privkey = binascii.unhexlify(PRIV_KEY)
tea_key = svr.get_ecdh_key(client.get_pubkey())
tmpbuffer = tea_decrypt(tmpbuffer, tea_key)
if MAGIC_COMPRESS_START2 == _buffer[_offset]:
decompressor = zlib.decompressobj(-zlib.MAX_WBITS)
tmpbuffer = decompressor.decompress(str(tmpbuffer))
else:
decompressor = zstd.ZstdDecompressor()
tmpbuffer = next(decompressor.read_from(ZstdDecompressReader(str(tmpbuffer)), 100000, 1000000))
elif MAGIC_ASYNC_NO_CRYPT_ZSTD_START == _buffer[_offset]:
decompressor = zstd.ZstdDecompressor()
tmpbuffer = next(decompressor.read_from(ZstdDecompressReader(str(tmpbuffer)), 100000, 1000000))
elif MAGIC_COMPRESS_START == _buffer[_offset] or MAGIC_COMPRESS_NO_CRYPT_START == _buffer[_offset]:
decompressor = zlib.decompressobj(-zlib.MAX_WBITS)
tmpbuffer = decompressor.decompress(str(tmpbuffer))
elif MAGIC_COMPRESS_START1 == _buffer[_offset]:
decompress_data = bytearray()
while len(tmpbuffer) > 0:
single_log_len = struct.unpack_from("H", buffer(tmpbuffer, 0, 2))[0]
decompress_data.extend(tmpbuffer[2:single_log_len + 2])
tmpbuffer[:] = tmpbuffer[single_log_len + 2:len(tmpbuffer)]
decompressor = zlib.decompressobj(-zlib.MAX_WBITS)
tmpbuffer = decompressor.decompress(str(decompress_data))
else:
pass
# _outbuffer.extend('seq:%d, hour:%d-%d len:%d decompress:%d\n' %(seq, ord(begin_hour), ord(end_hour), length, len(tmpbuffer)))
except Exception as e:
traceback.print_exc()
_outbuffer.extend("[F]decode_log_file.py decompress err, " + str(e) + "\n")
return _offset + headerLen + length + 1
_outbuffer.extend(tmpbuffer)
return _offset + headerLen + length + 1
def ParseFile(_file, _outfile):
fp = open(_file, "rb")
_buffer = bytearray(os.path.getsize(_file))
fp.readinto(_buffer)
fp.close()
startpos = GetLogStartPos(_buffer, 2)
if -1 == startpos:
return
outbuffer = bytearray()
while True:
startpos = DecodeBuffer(_buffer, startpos, outbuffer)
if -1 == startpos: break
if 0 == len(outbuffer): return
fpout = open(_outfile, "wb")
fpout.write(outbuffer)
fpout.close()
def main(args):
global lastseq
if 1 == len(args):
if os.path.isdir(args[0]):
filelist = glob.glob(args[0] + "/*.xlog")
for filepath in filelist:
lastseq = 0
ParseFile(filepath, filepath + ".log")
else:
ParseFile(args[0], args[0] + ".log")
elif 2 == len(args):
ParseFile(args[0], args[1])
else:
filelist = glob.glob("*.xlog")
for filepath in filelist:
lastseq = 0
ParseFile(filepath, filepath + ".log")
if __name__ == "__main__":
main(sys.argv[1:])