用 Python 将下载文件的 MD5 与 SFTP 服务器上的文件进行比较 [英] Comparing MD5 of downloaded files against files on an SFTP server in Python

问题描述

在这里，我试图列出我下载的文件的所有 MD5，并将它们与原始文件进行比较，看看它们是否是相同的文件.我现在无法访问服务器来测试此代码，但我真的很好奇它是否有效......有人有更好的解决方案或他们会改变的东西吗?

Here I am trying to list all the MD5's of the files I downloaded and compare them to the original to see if they are the same Files. I can't access a server to test this code right now but I was really curious if it would work... Does someone have a better solution or something they would change?

#!/usr/bin/python3
import paramiko
import pysftp
import os
import sys

print("Localpath eingeben: ")
localpath = input()
print("Remothpath eingeben: ")
remotepath = input()
k = paramiko.RSAKey.from_private_key_file("/home/abdulkarim/.ssh/id_rsa")
c = paramiko.SSHClient()
c.set_missing_host_key_policy(paramiko.AutoAddPolicy())
print("connecting")
c.connect(hostname = "do-test", username = "abdulkarim", pkey = k)
print("connected")
sftp = c.open_sftp()
sftp.Connection.get_d(localpath, remotepath)
#sftp.get_d(localpath, remotepath)

def hashCheckDir(f,r):
    files = []
    # r=root, d=directories, f=files
    for r, d, f in os.walk(localpath):
        for file in f:
            if '.txt' in file:
                files.append(os.path.join(r, file))
    files1 = []
    # r=root, d=directories, f=files
    for r, d, f in os.walk(remotepath):
        for file in f:
            if '.txt' in file:
                files.append(os.path.join(r, file))

    for i in range(2):
        for x in files:
            localsum = os.system('md5sum ' + files)
            remotesum = os.system('ssh do-test md5sum ' + files1)
            if localsum == remotesum:
                print ("The lists are identical")
            else :
                print ("The lists are not identical")

hashCheckDir(localpath,remotepath)
c.close()

我对 Python 还很陌生，所以.. 如果我犯了一些愚蠢的错误，请原谅我.也许我必须先对它们进行排序?

I am pretty new to Python so.. Bear with me if I did some stupid mistake. Maybe I have to sort them first?

推荐答案

启动外部控制台应用程序 (ssh) 在服务器上执行 md5sum (并为上面的每个文件打开一个新连接)，如果您已经有到同一台服务器的本机 Python SSH 连接.

It's an overkill to launch an external console application (ssh) to execute md5sum on the server (and open a new connection for each and every file on top of that), if you already have a native Python SSH connection to the same server.

改为使用SSHClient.exec_command:

stdin, stdout, stderr = c.exec_command('md5sum '+ files1)
checksum = stdout.read()

请注意，MD5 已过时，请使用 SHA-256 (sha256sum).

尽管问题是整个校验和检查是否过大，请参阅:
如何在 SFTP 文件传输期间执行校验和以确保数据完整性?

Though question is whether the whole checksum check isn't an overkill, see:
How to perform checksums during a SFTP file transfer for data integrity?

强制性警告:请勿使用 AutoAddPolicy – 您将失去针对 MITM 攻击 这样做.如需正确的解决方案，请参阅Paramiko未知服务器".

Obligatory warning: Do not use AutoAddPolicy – You are losing a protection against MITM attacks by doing so. For a correct solution, see Paramiko "Unknown Server".

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