PyInstaller打包Python代码与其不安全因素验证

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一般情况下，写完的代码如果需要拿出去用，是不希望给对方源代码的，这个大家应该都懂，我们一般是给对方提供一个可执行文件或者便于调用的SO库等，那么今天我们来使用PyInstaller进行打包，看一下效果。

说一下系统环境: Ubuntu 18.04

打包代码

先看一段利用numpy进行矩阵乘法计算为例: 

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#!/bin/python3
# -*- coding=utf8 -*-

import numpy as np


class Calc:
    def __init__(self):
        self.a_array = [[1, 0], [0, 1]]
        self.b_array = [[4, 1], [2, 2]]

    def calc_matmul(self):
        return np.matmul(self.a_array, self.b_array)


def main():
    c = Calc()
    result = c.calc_matmul()
    print(result)


if __name__ == '__main__':
    main()

现在我们开始安装PyInstaller, 关于PyInstaller的选项含义可以去官方文档查看​：​

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pip install Pyinstaller

这里我选择的是onefile模式: 

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$ pyinstaller --onefile calc.py 
25 INFO: PyInstaller: 3.6
25 INFO: Python: 3.7.5
25 INFO: Platform: Linux-5.3.0-40-generic-x86_64-with-Ubuntu-18.04-bionic
25 INFO: wrote /home/top/CodeWork/Python/ABC/calc.spec
28 INFO: UPX is not available.
30 INFO: Extending PYTHONPATH with paths
['/home/top/CodeWork/Python/ABC', '/home/top/CodeWork/Python/ABC']
30 INFO: checking Analysis
30 INFO: Building Analysis because Analysis-00.toc is non existent
30 INFO: Initializing module dependency graph...
31 INFO: Caching module graph hooks...
34 INFO: Analyzing base_library.zip ...
2423 INFO: Caching module dependency graph...
2479 INFO: running Analysis Analysis-00.toc
2541 INFO: Analyzing /home/top/CodeWork/Python/ABC/calc.py
3134 INFO: Processing pre-find module path hook   distutils
3134 INFO: distutils: retargeting to non-venv dir '/usr/lib/python3.7'
4070 INFO: Processing pre-safe import module hook   setuptools.extern.six.moves
4985 INFO: Processing pre-find module path hook   site
4985 INFO: site: retargeting to fake-dir '/home/top/CodeWork/Python/ABC/venv/lib/python3.7/site-packages/PyInstaller/fake-modules'
6414 INFO: Processing module hooks...
6414 INFO: Loading module hook "hook-lib2to3.py"...
6415 INFO: Loading module hook "hook-sysconfig.py"...
6422 INFO: Loading module hook "hook-pkg_resources.py"...
7336 INFO: Processing pre-safe import module hook   win32com
7480 INFO: Excluding import '__main__'
7481 INFO:   Removing import of __main__ from module pkg_resources
7481 INFO: Loading module hook "hook-numpy.core.py"...
7582 INFO: Loading module hook "hook-encodings.py"...
7618 INFO: Loading module hook "hook-distutils.py"...
7619 INFO: Loading module hook "hook-xml.py"...
7658 INFO: Loading module hook "hook-numpy.py"...
7658 INFO: Loading module hook "hook-pydoc.py"...
7658 INFO: Loading module hook "hook-setuptools.py"...
8246 INFO: checking Tree
8246 INFO: Building Tree because Tree-00.toc is non existent
8246 INFO: Building Tree Tree-00.toc
8247 INFO: Looking for ctypes DLLs
8470 INFO: Analyzing run-time hooks ...
8477 INFO: Including run-time hook 'pyi_rth_pkgres.py'
8478 INFO: Including run-time hook 'pyi_rth_multiprocessing.py'
8486 INFO: Looking for dynamic libraries
8913 INFO: Looking for eggs
8913 INFO: Python library not in binary dependencies. Doing additional searching...
8988 INFO: Using Python library /usr/lib/x86_64-linux-gnu/libpython3.7m.so.1.0
8995 INFO: Warnings written to /home/top/CodeWork/Python/ABC/build/calc/warn-calc.txt
9031 INFO: Graph cross-reference written to /home/top/CodeWork/Python/ABC/build/calc/xref-calc.html
9044 INFO: checking PYZ
9044 INFO: Building PYZ because PYZ-00.toc is non existent
9044 INFO: Building PYZ (ZlibArchive) /home/top/CodeWork/Python/ABC/build/calc/PYZ-00.pyz
9597 INFO: Building PYZ (ZlibArchive) /home/top/CodeWork/Python/ABC/build/calc/PYZ-00.pyz completed successfully.
9603 INFO: checking PKG
9603 INFO: Building PKG because PKG-00.toc is non existent
9603 INFO: Building PKG (CArchive) PKG-00.pkg
23709 INFO: Building PKG (CArchive) PKG-00.pkg completed successfully.
23710 INFO: Bootloader /home/top/CodeWork/Python/ABC/venv/lib/python3.7/site-packages/PyInstaller/bootloader/Linux-64bit/run
23710 INFO: checking EXE
23710 INFO: Building EXE because EXE-00.toc is non existent
23710 INFO: Building EXE from EXE-00.toc
23711 INFO: Appending archive to ELF section in EXE /home/top/CodeWork/Python/ABC/dist/calc
24557 INFO: Building EXE from EXE-00.toc completed successfully.

可以看到在输出了一系列信息后，已经打包成功，新增了两个文件夹build和dist，我们需要的可执行文件就在dist文件夹中。同时在上面的输出信息中，提示我这里是不支持UPX的，如果想要可执行文件尽可能小的话，可以进行配置:
https://github.com/upx/upx

为了保证可用，现在将刚生成的可执行文件拷贝到另一台机器(我这里是台裸机)，分别用file和ldd看一下calc的信息: 

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$ file calc
calc: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/l, for GNU/Linux 2.6.32, BuildID[sha1]=294d1f19a085a730da19a6c55788ec08c2187039, stripped
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$ ldd calc 
	linux-vdso.so.1 (0x00007ffcac9bd000)
	libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007fd33aacd000)
	libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007fd33a8b0000)
	libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fd33a4bf000)
	/lib64/ld-linux-x86-64.so.2 (0x00007fd33acd1000)

验证执行: 

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$ chmod +x calc 
$ ./calc 
[[4 1]
 [2 2]]

可以看到的确是可以成功执行的，calc在执行的时候，会在tmp目录下面创建一个_MEIXXXXX的文件夹，程序结束之后会删掉。

不安全因素

上面的效果看起来极好，就一个可执行文件，不需要安装相应的依赖包等等，现在来一起来看看其不安全在哪儿?
PyInstaller安装以后，提供了一个工具pyi-archive_viewer，使用此命令可以检查使用PyInstaller构建的任何存档(PYZ或PKG)或任何可执行文件(.exe文件或ELF或COFF二进制文件)的内容: 

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$ pyi-archive_viewer dist/calc 
 pos, length, uncompressed, iscompressed, type, name
[(0, 247, 316, 1, 'm', 'struct'),
 (247, 1117, 1827, 1, 'm', 'pyimod01_os_path'),
 (1364, 4367, 9332, 1, 'm', 'pyimod02_archive'),
 (5731, 7410, 18646, 1, 'm', 'pyimod03_importers'),
 (13141, 1853, 4157, 1, 's', 'pyiboot01_bootstrap'),
 (14994, 209, 254, 1, 's', 'pyi_rth_pkgres'),
 (15203, 1066, 1757, 1, 's', 'pyi_rth_multiprocessing'),
 (16269, 436, 754, 1, 's', 'calc'),
 (16705, 8275, 22040, 1, 'b', '_bz2.cpython-37m-x86_64-linux-gnu.so'),
 (24980, 102470, 149808, 1, 'b', '_codecs_cn.cpython-37m-x86_64-linux-gnu.so'),
 (127450, 35790, 158032, 1, 'b', '_codecs_hk.cpython-37m-x86_64-linux-gnu.so'),
 (163240,
  9809,
  26928,
  1,
  'b',
  '_codecs_iso2022.cpython-37m-x86_64-linux-gnu.so'),
 (173049, 97278, 272688, 1, 'b', '_codecs_jp.cpython-37m-x86_64-linux-gnu.so'),
 (270327, 78894, 137520, 1, 'b', '_codecs_kr.cpython-37m-x86_64-linux-gnu.so'),
 (349221, 63576, 112944, 1, 'b', '_codecs_tw.cpython-37m-x86_64-linux-gnu.so'),
 (412797, 1774, 6216, 1, 'b', '_contextvars.cpython-37m-x86_64-linux-gnu.so'),
 (414571, 52465, 126912, 1, 'b', '_ctypes.cpython-37m-x86_64-linux-gnu.so'),
 (467036, 28577, 79152, 1, 'b', '_curses.cpython-37m-x86_64-linux-gnu.so'),
 (495613, 62723, 179104, 1, 'b', '_decimal.cpython-37m-x86_64-linux-gnu.so'),
 (558336, 11073, 29912, 1, 'b', '_hashlib.cpython-37m-x86_64-linux-gnu.so'),
 (569409, 32233, 66472, 1, 'b', '_json.cpython-37m-x86_64-linux-gnu.so'),
 (601642, 13561, 33592, 1, 'b', '_lzma.cpython-37m-x86_64-linux-gnu.so'),
 (615203,
  24109,
  56600,
  1,
  'b',
  '_multibytecodec.cpython-37m-x86_64-linux-gnu.so'),
 (639312,
  6007,
  15856,
  1,
  'b',
  '_multiprocessing.cpython-37m-x86_64-linux-gnu.so'),
 (645319, 2041, 6280, 1, 'b', '_opcode.cpython-37m-x86_64-linux-gnu.so'),
 (647360, 5266, 16888, 1, 'b', '_queue.cpython-37m-x86_64-linux-gnu.so'),
 (652626, 42227, 116568, 1, 'b', '_ssl.cpython-37m-x86_64-linux-gnu.so'),
 (694853, 30120, 66728, 1, 'b', 'libbz2.so.1.0'),
 (724973, 1296821, 2917216, 1, 'b', 'libcrypto.so.1.1'),
 (2021794, 70921, 202880, 1, 'b', 'libexpat.so.1'),
 (2092715, 15792, 31032, 1, 'b', 'libffi.so.6'),
 (2108507, 289465, 1023960, 1, 'b', 'libgfortran-ed201abd.so.3.0.0'),
 (2397972, 79560, 153984, 1, 'b', 'liblzma.so.5'),
 (2477532, 96843, 227944, 1, 'b', 'libmpdec.so.2'),
 (2574375, 89731, 190400, 1, 'b', 'libncursesw.so.5'),
 (2664106, 8144678, 29724672, 1, 'b', 'libopenblasp-r0-34a18dc3.3.7.so'),
 (10808784, 1924269, 5075632, 1, 'b', 'libpython3.7m.so.1.0'),
 (12733053, 126584, 294632, 1, 'b', 'libreadline.so.7'),
 (12859637, 230870, 577312, 1, 'b', 'libssl.so.1.1'),
 (13090507, 64264, 170784, 1, 'b', 'libtinfo.so.5'),
 (13154771, 60099, 116960, 1, 'b', 'libz.so.1'),
 (13214870, 10217, 25392, 1, 'b', 'mmap.cpython-37m-x86_64-linux-gnu.so'),
 (13225087,
  183969,
  580203,
  1,
  'b',
  'numpy/core/_multiarray_tests.cpython-37m-x86_64-linux-gnu.so'),
 (13409056,
  5453208,
  21507704,
  1,
  'b',
  'numpy/core/_multiarray_umath.cpython-37m-x86_64-linux-gnu.so'),
 (18862264,
  117613,
  386852,
  1,
  'b',
  'numpy/fft/_pocketfft_internal.cpython-37m-x86_64-linux-gnu.so'),
 (18979877,
  247676,
  880560,
  1,
  'b',
  'numpy/linalg/_umath_linalg.cpython-37m-x86_64-linux-gnu.so'),
 (19227553,
  31084,
  112928,
  1,
  'b',
  'numpy/linalg/lapack_lite.cpython-37m-x86_64-linux-gnu.so'),
 (19258637,
  260469,
  839751,
  1,
  'b',
  'numpy/random/_bit_generator.cpython-37m-x86_64-linux-gnu.so'),
 (19519106,
  612717,
  2055697,
  1,
  'b',
  'numpy/random/_bounded_integers.cpython-37m-x86_64-linux-gnu.so'),
 (20131823,
  391914,
  1336140,
  1,
  'b',
  'numpy/random/_common.cpython-37m-x86_64-linux-gnu.so'),
 (20523737,
  915600,
  3146458,
  1,
  'b',
  'numpy/random/_generator.cpython-37m-x86_64-linux-gnu.so'),
 (21439337,
  143505,
  441589,
  1,
  'b',
  'numpy/random/_mt19937.cpython-37m-x86_64-linux-gnu.so'),
 (21582842,
  105117,
  313851,
  1,
  'b',
  'numpy/random/_pcg64.cpython-37m-x86_64-linux-gnu.so'),
 (21687959,
  123509,
  378648,
  1,
  'b',
  'numpy/random/_philox.cpython-37m-x86_64-linux-gnu.so'),
 (21811468,
  80675,
  226814,
  1,
  'b',
  'numpy/random/_sfc64.cpython-37m-x86_64-linux-gnu.so'),
 (21892143,
  683210,
  2363744,
  1,
  'b',
  'numpy/random/mtrand.cpython-37m-x86_64-linux-gnu.so'),
 (22575353, 11621, 31752, 1, 'b', 'readline.cpython-37m-x86_64-linux-gnu.so'),
 (22586974, 5004, 15656, 1, 'b', 'resource.cpython-37m-x86_64-linux-gnu.so'),
 (22591978, 7944, 24968, 1, 'b', 'termios.cpython-37m-x86_64-linux-gnu.so'),
 (22599922, 217880, 780923, 1, 'x', 'base_library.zip'),
 (22817802, 615, 4086, 1, 'x', 'include/python3.7m/pyconfig.h'),
 (22818417,
  20139,
  83035,
  1,
  'x',
  'lib/python3.7/config-3.7m-x86_64-linux-gnu/Makefile'),
 (22838556, 2445, 6562, 1, 'x', 'lib2to3/Grammar.txt'),
 (22841001, 419, 793, 1, 'x', 'lib2to3/PatternGrammar.txt'),
 (22841420, 3469029, 3469029, 0, 'z', 'PYZ-00.pyz')]
?

在上面这一系列输出中可以看出环境下安装的一些依赖，比如我安装的numpy，还有两个极为重要的文件：calc、PYZ-00.pyz。这两个东西，跟源代码息息相关。

验证不安全因素

继续操作，通过pyi-archive_viewer提取calc可执行文件为pyc文件: 

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? x calc
to filename? calc.pyc

现在得到一个calc.pyc文件，都已经拿到了pyc文件了，那么如果源代码没经过混淆或者其他处理的话，就直接可以得到一毛一样的源码。

接下来安装超级著名的反编译工具uncompyle6: 

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pip install uncompyle6

直接执行: 

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$ uncompyle6 calc.pyc 
Traceback (most recent call last):
  File "/home/top/CodeWork/Python/ABC/venv/lib/python3.7/site-packages/xdis/load.py", line 143, in load_module_from_file_object
    float_version = float(magics.versions[magic][:3])
KeyError: b'\xe3\x00\x00\x00'

During handling of the above exception, another exception occurred:

会发现报错了，这是因为在pyc文件中缺少了相应的magic，怎么获取magic呢?

Python代码在执行的时候会生成一个__pycache__目录，里面会有calc.cpython-37.pyc文件，现在分别用hexdump查看两个文件: 

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$ hexdump -C __pycache__/calc.cpython-37.pyc 
00000000  42 0d 0d 0a 00 00 00 00  d3 b9 63 5e 74 01 00 00  |B.........c^t...|
00000010  e3 00 00 00 00 00 00 00  00 00 00 00 00 03 00 00  |................|
00000020  00 40 00 00 00 73 30 00  00 00 64 00 64 01 6c 00  |.@...s0...d.d.l.|
00000030  5a 01 47 00 64 02 64 03  84 00 64 03 83 02 5a 02  |Z.G.d.d...d...Z.|
00000040  64 04 64 05 84 00 5a 03  65 04 64 06 6b 02 72 2c  |d.d...Z.e.d.k.r,|
00000050  65 03 83 00 01 00 64 01  53 00 29 07 e9 00 00 00  |e.....d.S.).....|
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$ hexdump -C calc.pyc 
00000000  e3 00 00 00 00 00 00 00  00 00 00 00 00 03 00 00  |................|
00000010  00 40 00 00 00 73 30 00  00 00 64 00 64 01 6c 00  |.@...s0...d.d.l.|
00000020  5a 01 47 00 64 02 64 03  84 00 64 03 83 02 5a 02  |Z.G.d.d...d...Z.|
00000030  64 04 64 05 84 00 5a 03  65 04 64 06 6b 02 72 2c  |d.d...Z.e.d.k.r,|
00000040  65 03 83 00 01 00 64 01  53 00 29 07 e9 00 00 00  |e.....d.S.).....|

可以发现，在两个文件的靠前部分的内容基本一致，calc.pyc与calc.cpython-37.pyc相比缺了第一行，缺的这一行就是所谓的版本magic，直接对calc.pyc进行编辑，将calc.cpython-37.pyc第一行的magic加上即可。这里要注意下，Python的不同版本magic是不同的。

那么再次执行uncompyle6，就可以获得源码了: 

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$ uncompyle6 calc.pyc 
# uncompyle6 version 3.6.4
# Python bytecode 3.7 (3394)
# Decompiled from: Python 3.7.5 (default, Nov  7 2019, 10:50:52) 
# [GCC 8.3.0]
# Embedded file name: calc.py
# Size of source mod 2**32: 372 bytes
import numpy as np

class Calc:

    def __init__(self):
        self.a_array = [
         [
          1, 0], [0, 1]]
        self.b_array = [[4, 1], [2, 2]]

    def calc_matmul(self):
        return np.matmul(self.a_array, self.b_array)


def main():
    c = Calc()
    result = c.calc_matmul()
    print(result)


if __name__ == '__main__':
    main()
# okay decompiling calc.pyc

由此可见，想使用PyInstaller作为隐藏源码的方式还是不安全的，对反编译来说只是稍微有一点点门槛罢了，那么咋提高一些呢，我想是可以结合Cython去做这件事的。

参考链接

1、https://docs.scipy.org/doc/numpy-1.10.1/reference/generated/numpy.matmul.html
2、https://pyinstaller.readthedocs.io/en/stable/usage.html

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