Python：kernel32.CreateProcessA()它在做什么？

2019年8月4日 144次阅读

我目前正在学习调试器以及它们如何停止进程.

这是我的代码：

    from ctypes import *
    WORD = c_ushort
    DWORD = c_ulong
    LPBYTE = POINTER(c_ubyte)
    LPTSTR = POINTER(c_char)
    HANDLE = c_void_p
    DEBUG_PROCESS = 0x00000001
    CREATE_NEW_CONSOLE = 0x00000010
    class STARTUPINFO(Structure):
        _fields_ = [
        ("cb", DWORD),
        ("lpReserved", LPTSTR),
        ("lpDesktop", LPTSTR),
        ("lpTitle", LPTSTR),
        ("dwX", DWORD),
        ("dwY", DWORD),
        ("dwXSize", DWORD),
        ("dwYSize", DWORD),
        ("dwXCountChars", DWORD),
        ("dwYCountChars", DWORD),
        ("dwFillAttribute",DWORD),
        ("dwFlags", DWORD),
        ("wShowWindow", WORD),
        ("cbReserved2", WORD),
        ("lpReserved2", LPBYTE),
        ("hStdInput", HANDLE),
        ("hStdOutput", HANDLE),
        ("hStdError", HANDLE),
        ]
    class PROCESS_INFORMATION(Structure):
        _fields_ = [
        ("hProcess", HANDLE),
        ("hThread", HANDLE),
        ("dwProcessId", DWORD),
        ("dwThreadId", DWORD),
        ]


    kernel32 = windll.kernel32
    class debugger():
        def __init__(self):
            pass

        def load(path_to_exe):
            creation_flags = DEBUG_PROCESS
            startupinfo = STARTUPINFO()
            processinfo = PROCESS_INFORMATION()
            startupinfo.dwFlags = 0x1
            startupinfo.wShowWindow = 0x0
            startupinfo.cb = sizeof(startupinfo)
            if kernel32.CreateProcessA(path_to_exe,None,None,None,None,creation_flags,None,None,byref(startupinfo),byref(processinfo)):
                print("[*] Process launched")
                print("[*] PID: %d" % (PROCESS_INFORMATION.dwProcessId))
            else:
                print("[*] Error: 0x%08x." % (kernel32.GetLastError()))

    debugger.load("C:\\WINDOWS\\system32\\calc.exe")

每当我运行它,它就会出错. :(我发现它之所以会出现错误的原因是因为kernel32.CreateProcessA返回false.我实际上正在跟随Gray hat python,我正在将此代码转换为python 3它.

我的问题是,kernel32.CreateProcessA正在做什么,为什么它返回false,我怎么能阻止它返回false？

任何帮助将非常感激！

最佳答案 您的代码中有几个错误：

第一个错误是调试器类的加载方法定义错误.在你的情况下,它最可能是staticmethod：

# . . .

# This decorator required to make method static
@staticmethod
def load(path_to_exe):
    creation_flags = DEBUG_PROCESS
    startupinfo = STARTUPINFO()
    processinfo = PROCESS_INFORMATION()
    startupinfo.dwFlags = 0x1

# . . .

如果创建了进程,则第二个错误在于打印：

if kernel32.CreateProcessA(path_to_exe,None,None,None,None,
                           creation_flags,None,None,
                           byref(startupinfo),byref(processinfo)):
    print("[*] Process launched")

    # ERROR AT THE LINE BELOW
    # Your variant: print("[*] PID: %d" % (PROCESS_INFORMATION.dwProcessId))
    # But it should be the structure itself not it "type"
    print("[*] PID: %d" % (processinfo.dwProcessId))  
else:
    print("[*] Error: 0x%08x." % (kernel32.GetLastError()))

在我的情况下它是有效的(Windows XP).如果你的进程没有真正启动,你会得到类似的控制台消息：

[*] Error: 0x00000002

然后,如果你使用Python 3.x,你应该使用CreateProcessA而不是CreateProcessW函数,因为Python 3.x中的所有字符串都是unicode(在WinAPI中,所有函数都以’A’接受asci-strings结束,以’W’结尾接受unicode-字符串).更准确的答案是,如果你写了你的情况下发生了什么错误或异常.

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