使用python删除Windows上的文件权限

Question

I have used the following to grant access to a file. Courtesy of kindall 

https://stackoverflow.com/a/12168268/740899

> import win32security 
> import ntsecuritycon as con
> 
> FILENAME = "whatever"
> 
> userx, domain, type = win32security.LookupAccountName ("", "User X")
> 
> sd = win32security.GetFileSecurity(FILENAME, win32security.DACL_SECURITY_INFORMATION) 
> dacl = sd.GetSecurityDescriptorDacl()   # instead of dacl = win32security.ACL()
> 
> dacl.AddAccessAllowedAce(win32security.ACL_REVISION, con.FILE_GENERIC_READ | con.FILE_GENERIC_WRITE, userx)
> 
> sd.SetSecurityDescriptorDacl(1, dacl, 0)   # may not be necessary
> win32security.SetFileSecurity(FILENAME, win32security.DACL_SECURITY_INFORMATION, sd)

但是，访问权限必须是临时的。所以我使用dacl.AddAccessDeniedAce代替上面显示的dacl.AddAccessAllowedAce。但是，这会产生不良行为，因为我的用户将来需要再次进行临时访问。运行AddAccessDeniedAce然后重新运行AddAccessAllowedAce后，拒绝的控件仍然存在，我的用户仍然无法访问该文件。当用户不再需要访问权限时，我想完全删除它们。这可以通过Windows资源管理器中的属性菜单完成：

我无法找到支持此类任务的文档。有没有人知道如何通过操纵dacl来做到这一点？或者我是否必须通过Windows界面手动执行此操作？

Answer 1

在此处找到解决方案：http://voices.canonical.com/tag/windows/

我不得不稍微调整一下，但它正在发挥作用。呼！

def remove_ace(path,usernames):
    """Remove the ace for the given users."""
    if not os.path.exists(path):
        raise WindowsError('Path %s could not be found.' % path)
    total = 0
    for x in usernames:
        userx, domain, utype = win32security.LookupAccountName("", x)
        sd = win32security.GetFileSecurity(path, win32security.DACL_SECURITY_INFORMATION)
        dacl = sd.GetSecurityDescriptorDacl()
        num_delete = 0
        for index in range(0, dacl.GetAceCount()):
            ace = dacl.GetAce(index - num_delete)
            if userx == ace[2]:
                dacl.DeleteAce(index - num_delete)
                num_delete += 1
                total += 1
        if num_delete > 0:
            sd.SetSecurityDescriptorDacl(1, dacl, 0)
            win32security.SetFileSecurity(path, win32security.DACL_SECURITY_INFORMATION, sd)
    if total > 0:
        return True