问题描述

我有一个共享 Windows 服务器上用户的 SID 字符串(例如，S-1-5-21-500000003-1000000000-1000000003-1001")，我需要获取相关的用户名.

I have a SID string (e.g., "S-1-5-21-500000003-1000000000-1000000003-1001") of a user on a shared Windows server, and I need to get the related username.

我想这可以通过以下方式实现:

I suppose that this may be achieved by:

1. 将 SID 字符串转换为字节数组.
2. 使用合适的 ldpa 查询来获取相关的用户名.

1. Turning the SID string into byte array.
2. Using a suitable ldpa query to get the related username.

但我没有找到准确可靠的操作说明(以这种或另一种方式).

But I failed to find exact and reliable instructions of how to do it (this way or another).

我会很感激任何有用的指南，特别是如果它附带演示 Python (ldap3) 代码.

I'll appreciate any useful guide, especially if it comes with demo Python (ldap3) code.

推荐答案

def unsigned_number_to_slashed_byte_array_string(number, little_endian, digits_count):
        """
        Convert given unsigned number into a string that represents it as a sequence of bytes in given order (either little or big Endian).
        In case the total number of digits in the string is greater than given digits count, the string is left-padded with zeroes.
        Each such byte is represented by a substring that's composed of a preceding slash character followed by two (uppercase) hexadecimal digits (e.g., "\0A").
        :param number: An unsigned non-negative integer.
        :param little_endian: A flag that says whether little Endian order is requested; otherwise, big Endian order is selected.
        :param digits_count: The total count of hexadecimal digits in the resulting possibly left-padded string, which is twice the number of bytes.
        :except ValueError: In case given number isn't a non-negative number, or given digits count isn't a positive even number.
        :return: A string that represents given number as a sequence of bytes in given order.
        """
        if number < 0: raise ValueError("{0}: Argument number must be a non-negative! ({1})".format(func_name(), number))
        if (digits_count <= 0) or ((digits_count % 2) != 0): raise ValueError("{0}: Argument digits_count must be an even positive! ({1})".format(func_name(), digits_count))

        zero_padded_hex_number_str = "{0:0{1}X}".format(number, digits_count) # Format: no leading "0x", zero-padded digits_count digits (or half digits_count bytes), uppercase hexadecimal letters.
        number_byte_array_str = ""
        byte_starter_digits_indices_list = range(len(zero_padded_hex_number_str))[::2]
        if little_endian: byte_starter_digits_indices_list = reversed(byte_starter_digits_indices_list)
        for byte_starter_digit_index in byte_starter_digits_indices_list:
            number_byte_array_str = "{0}\{1}".format(number_byte_array_str, zero_padded_hex_number_str[byte_starter_digit_index:(byte_starter_digit_index + 2)])
        return number_byte_array_str


def sid_str_to_byte_array_str(sid_str):
    """
    :param sid_str: An active-directory SID string (e.g., "S-1-5-21-1241979920-1440912824-1533017923-1106").
    :return: A string that represents given SID string as a byte array string (e.g., "\01\05\00\00\00\00\00\05\15\00\00\00\10\1C\07\4A\B8\95\E2\55\43\FF\5F\5B").
    """
    dashes_count = sid_str.count("-")
    sid_numbers_str = sid_str[2:] # Removes the preceding "S-"
    sid_number_strings = sid_numbers_str.split("-")
    sid_numbers = [int(sid_number_string) for sid_number_string in sid_number_strings]
    sid_byte_array_str  = unsigned_number_to_slashed_byte_array_string(sid_numbers[0],       True,   2)
    sid_byte_array_str += unsigned_number_to_slashed_byte_array_string((dashes_count - 2),   True,   2)
    sid_byte_array_str += unsigned_number_to_slashed_byte_array_string(sid_numbers[1],       False, 12)
    sid_byte_array_str += unsigned_number_to_slashed_byte_array_string(sid_numbers[2],       True,   8)
    sid_byte_array_str += unsigned_number_to_slashed_byte_array_string(sid_numbers[3],       True,   8)
    sid_byte_array_str += unsigned_number_to_slashed_byte_array_string(sid_numbers[4],       True,   8)
    sid_byte_array_str += unsigned_number_to_slashed_byte_array_string(sid_numbers[5],       True,   8)
    return sid_byte_array_str

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