File c:\demo\test.txt is only accessible (full control) by a given, normal user. However, someone figured out it can be done indirectly by using flag 0x2000 (os.O_DIRECTORY ?) : fd = os.open('c:\\demo\\test.txt', 0x2000) Like open, os.open has no argument to pass flag FILE_FLAG_BACKUP_SEMANTICS. Python also has function os.open, it returns a file descriptor that can then be used with other file descriptor operations, like read. Python’s open function has no argument where we can pass flag FILE_FLAG_BACKUP_SEMANTICS, so we cannot use open. We can do that, but I found a simpler method. In Python, we usually access files via function open, and not via WIN32 API function CreateFile. Part 2, opening the file, is typically done with WIN32 API function CreateFile and passing it the FILE_FLAG_BACKUP_SEMANTICS flag with argument dwFlagsAndAttributes. Win32security.AdjustTokenPrivileges(hToken, 0, )ĮnablePrivilege(win32security.SE_BACKUP_NAME) HToken = win32security.OpenProcessToken(win32api.GetCurrentProcess(), win32security.TOKEN_ADJUST_PRIVILEGES | win32security.TOKEN_QUERY)
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Part 1, enabling the privilege can be done in Python with the following code (it relies on pywin32). For example, the SeBackupPrivilege allows a user to read any file, even if the security descriptor denies access.īut just having the SeBackupPrivilege is not enough:ġ) it needs to be enabled programmaticallyĢ) when opening a file, the intention to use the privilege must be specifiedĭoing this in a programming language like C is easy (for example, I programmed this into my FileScanner tool), but for Python, it’s a bit more complicated. When a user holds a privilege, it allows that user to do things that other users without that privilege are not allowed to do. Like SeBackupPrivilege and SeRestorePrivilege (these are privileges necessary for backup operators).
Administrators have many privileges that normal users don’t have. A privilege is a property that a user holds.
Most files don’t have their own, proper permissions: they inherit them from their parent folders.Įven administrators can be denied access to a file through DACL configuration.īut there is another mechanism that governs access to securable objects like files: privileges.
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Access to files on a Windows NTFS filesystem is governed by permissions and privileges.įor permissions, it is done with a security descriptor on a file which contains a Discretionary Access Control List (DACL): these are the permissions that decide if a user has access (and which type of access) to said file.
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