Question

我目前正处于软件开发学位的第三年，我正在考虑明年扩展到一些安全模块，我选择“Violent Python”作为介绍并学习一门新语言，但是我我坚持第一次练习。

我不是编程的新手，也许我只是累了 - 这是一个漫长的一天很少睡觉 - 但这个简单的剧本不会工作：

import crypt
def testPass(cryptPass):
salt = cryptPass[0:2]
 dictFile = open('dictionary.txt')
 for word in dictFile.readlines():
  word = word.strip('\n')
  print "[*] Attempting password: "+word+"\n"
  cryptWord = crypt.crypt(word,salt)
  if (cryptWord == cryptPass):
   print "[+] Found Password: "+word+"\n"
   return
  print "[-] Password Not Found.\n"
  return
def main():
 passFile = open('passwords.txt')
 for line in passFile.readlines():
  if ":" in line:
   user = line.split(':')[0]
   cryptPass = line.split(':')[1].strip(' ')
   print "[*] Cracking Password For: "+user
   testPass(cryptPass)
if __name__ == "__main__":
 main()

Passwords.txt有两个来自/ etc / passwd（受害者和root用户）的用户，它可以很好地循环它们。我的dictionary.txt中有三个密码，由于某种原因它只尝试第一个密码：

[*] Cracking Password For: victim
[*] Attempting password: break 

[-] Password Not Found.

[*] Cracking Password For: root
[*] Attempting password: break 

[-] Password Not Found.

有人可以解释为什么上面提到的代码没有起作用吗？我设法通过使用'with open'来解决问题：

with open('dictionary.txt') as f:
 for word in f:
  word = word.strip("\n")
  cryptWord = crypt.crypt(word,salt)
  if (cryptWord == cryptPass):
   print "[+] Found Password: "+word+"\n"
   return
  print "[-] Password Not Found.\n"
  return

Answer 1

这是一个缩进错误。为了使事情正常工作，您的'testPass'功能应如下所示：

def testPass(cryptPass):
    salt = cryptPass[0:2]
    dictFile = open('dictionary.txt')
    for word in dictFile.readlines():
        word = word.strip('\n')
        print "[*] Attempting password: "+word+"\n"
        cryptWord = crypt.crypt(word,salt)
        if (cryptWord == cryptPass):
            print "[+] Found Password: "+word+"\n"
            return
     print "[-] Password Not Found.\n"
     return

这样，它将循环遍历字典中的每个单词，并在找到密码后返回。如果它在没有找到它的情况下遍历所有内容，它应该然后打印“找不到密码”。你的问题是你的代码（为了清晰起见而略微间隔）实际上是这样缩进的：

def testPass(cryptPass):
    salt = cryptPass[0:2]
    dictFile = open('dictionary.txt')
    for word in dictFile.readlines():
        word = word.strip('\n')
        print "[*] Attempting password: "+word+"\n"
        cryptWord = crypt.crypt(word,salt)
        if (cryptWord == cryptPass):
            print "[+] Found Password: "+word+"\n"
            return
        print "[-] Password Not Found.\n"
        return

看到区别？像这样，它只会检查第一个单词，因为第二个“返回”在循环内。请验证您的缩进（理想情况下为4个空格，如@jonrsharpe所说，或选项卡）并再次尝试。我怀疑这会解决你的问题。

Python For循环仅循环一次（对于文本文件中的每一行）

1 个答案: