Windows SID on pywin32

windows-sid-example.py

#!python3
import struct
from win32security import SID, ConvertStringSidToSid, ConvertSidToStringSid
from pywintypes import SIDType


def CopySID(sid: SIDType) -> SIDType:
    """Alternative way: ConvertStringSidToSid(ConvertSidToStringSid(sid))
    """
    result = SID()

    result.Initialize(sid.GetSidIdentifierAuthority(), sid.GetSubAuthorityCount())
    for i in range(sid.GetSubAuthorityCount()):
        result.SetSubAuthority(i, sid.GetSubAuthority(i))

    return result

def ConvertBytesToSid(b: bytes) -> SIDType:
    # https://blogs.msdn.microsoft.com/oldnewthing/20040315-00/?p=40253
    assert 8 <= len(b) and len(b) == 8 + b[1] * 4, 'wrong length, %d bytes' % len(b)
    assert b[0] == 1, 'Unknown SID revision, %d' % b[0]

    result = SID()

    result.Initialize(tuple(b[2:8]), b[1])
    for i in range(b[1]):
        result.SetSubAuthority(i, struct.unpack('<L', b[8 + 4 * i:8 + 4 * (i + 1)])[0])

    return result

if __name__ == '__main__':
    # str -> SID -> str
    assert ConvertSidToStringSid(ConvertStringSidToSid('S-1-5-21-2127521184-1604012920-1887927527-72713')) == 'S-1-5-21-2127521184-1604012920-1887927527-72713'
    # bytes -> SID -> str
    assert ConvertSidToStringSid(ConvertBytesToSid(b'\x01\x05\x00\x00\x00\x00\x00\x05\x15\x00\x00\x00\xA0\x65\xCF\x7E\x78\x4B\x9B\x5F\xE7\x7C\x87\x70\x09\x1C\x01\x00')) == 'S-1-5-21-2127521184-1604012920-1887927527-72713'
    # str -> SID -> bytes
    assert bytes(ConvertStringSidToSid('S-1-5-21-2127521184-1604012920-1887927527-72713')) == b'\x01\x05\x00\x00\x00\x00\x00\x05\x15\x00\x00\x00\xA0\x65\xCF\x7E\x78\x4B\x9B\x5F\xE7\x7C\x87\x70\x09\x1C\x01\x00'