Howto determine file owner on windows using python without pywin32
You could invoke a windows shell command "dir /q" and parse the output to find owners.
subprocess.call("dir /q", shell=True)
The following uses ctypes to call GetNamedSecurityInfo. Originally it followed the code snippet that's linked in the question, but GetNamedSecurityInfo is more useful in general than GetFileSecurity, especially since it's paired with SetNamedSecurityInfo in place of the obsolete function SetFileSecurity.
ctypes and classes
import ctypes as ctypes
from ctypes import wintypes as wintypes
kernel32 = ctypes.WinDLL('kernel32', use_last_error=True)
advapi32 = ctypes.WinDLL('advapi32', use_last_error=True)
ERROR_INVALID_FUNCTION = 0x0001
ERROR_FILE_NOT_FOUND = 0x0002
ERROR_PATH_NOT_FOUND = 0x0003
ERROR_ACCESS_DENIED = 0x0005
ERROR_SHARING_VIOLATION = 0x0020
SE_FILE_OBJECT = 1
OWNER_SECURITY_INFORMATION = 0x00000001
GROUP_SECURITY_INFORMATION = 0x00000002
DACL_SECURITY_INFORMATION = 0x00000004
SACL_SECURITY_INFORMATION = 0x00000008
LABEL_SECURITY_INFORMATION = 0x00000010
_DEFAULT_SECURITY_INFORMATION = (OWNER_SECURITY_INFORMATION |
GROUP_SECURITY_INFORMATION | DACL_SECURITY_INFORMATION |
LABEL_SECURITY_INFORMATION)
LPDWORD = ctypes.POINTER(wintypes.DWORD)
SE_OBJECT_TYPE = wintypes.DWORD
SECURITY_INFORMATION = wintypes.DWORD
class SID_NAME_USE(wintypes.DWORD):
_sid_types = dict(enumerate('''
User Group Domain Alias WellKnownGroup DeletedAccount
Invalid Unknown Computer Label'''.split(), 1))
def __init__(self, value=None):
if value is not None:
if value not in self.sid_types:
raise ValueError('invalid SID type')
wintypes.DWORD.__init__(value)
def __str__(self):
if self.value not in self._sid_types:
raise ValueError('invalid SID type')
return self._sid_types[self.value]
def __repr__(self):
return 'SID_NAME_USE(%s)' % self.value
PSID_NAME_USE = ctypes.POINTER(SID_NAME_USE)
class PLOCAL(wintypes.LPVOID):
_needs_free = False
def __init__(self, value=None, needs_free=False):
super(PLOCAL, self).__init__(value)
self._needs_free = needs_free
def __del__(self):
if self and self._needs_free:
kernel32.LocalFree(self)
self._needs_free = False
PACL = PLOCAL
class PSID(PLOCAL):
def __init__(self, value=None, needs_free=False):
super(PSID, self).__init__(value, needs_free)
def __str__(self):
if not self:
raise ValueError('NULL pointer access')
sid = wintypes.LPWSTR()
advapi32.ConvertSidToStringSidW(self, ctypes.byref(sid))
try:
return sid.value
finally:
if sid:
kernel32.LocalFree(sid)
class PSECURITY_DESCRIPTOR(PLOCAL):
def __init__(self, value=None, needs_free=False):
super(PSECURITY_DESCRIPTOR, self).__init__(value, needs_free)
self.pOwner = PSID()
self.pGroup = PSID()
self.pDacl = PACL()
self.pSacl = PACL()
# back references to keep this object alive
self.pOwner._SD = self
self.pGroup._SD = self
self.pDacl._SD = self
self.pSacl._SD = self
def get_owner(self, system_name=None):
if not self or not self.pOwner:
raise ValueError('NULL pointer access')
return look_up_account_sid(self.pOwner, system_name)
def get_group(self, system_name=None):
if not self or not self.pGroup:
raise ValueError('NULL pointer access')
return look_up_account_sid(self.pGroup, system_name)
def _check_bool(result, func, args):
if not result:
raise ctypes.WinError(ctypes.get_last_error())
return args
# msdn.microsoft.com/en-us/library/aa376399
advapi32.ConvertSidToStringSidW.errcheck = _check_bool
advapi32.ConvertSidToStringSidW.argtypes = (
PSID, # _In_ Sid
ctypes.POINTER(wintypes.LPWSTR)) # _Out_ StringSid
# msdn.microsoft.com/en-us/library/aa379166
advapi32.LookupAccountSidW.errcheck = _check_bool
advapi32.LookupAccountSidW.argtypes = (
wintypes.LPCWSTR, # _In_opt_ lpSystemName
PSID, # _In_ lpSid
wintypes.LPCWSTR, # _Out_opt_ lpName
LPDWORD, # _Inout_ cchName
wintypes.LPCWSTR, # _Out_opt_ lpReferencedDomainName
LPDWORD, # _Inout_ cchReferencedDomainName
PSID_NAME_USE) # _Out_ peUse
# msdn.microsoft.com/en-us/library/aa446645
advapi32.GetNamedSecurityInfoW.restype = wintypes.DWORD
advapi32.GetNamedSecurityInfoW.argtypes = (
wintypes.LPWSTR, # _In_ pObjectName
SE_OBJECT_TYPE, # _In_ ObjectType
SECURITY_INFORMATION, # _In_ SecurityInfo
ctypes.POINTER(PSID), # _Out_opt_ ppsidOwner
ctypes.POINTER(PSID), # _Out_opt_ ppsidGroup
ctypes.POINTER(PACL), # _Out_opt_ ppDacl
ctypes.POINTER(PACL), # _Out_opt_ ppSacl
ctypes.POINTER(PSECURITY_DESCRIPTOR)) # _Out_opt_ ppSecurityDescriptor
functions
def look_up_account_sid(sid, system_name=None):
SIZE = 256
name = ctypes.create_unicode_buffer(SIZE)
domain = ctypes.create_unicode_buffer(SIZE)
cch_name = wintypes.DWORD(SIZE)
cch_domain = wintypes.DWORD(SIZE)
sid_type = SID_NAME_USE()
advapi32.LookupAccountSidW(system_name, sid, name, ctypes.byref(cch_name),
domain, ctypes.byref(cch_domain), ctypes.byref(sid_type))
return name.value, domain.value, sid_type
def get_file_security(filename, request=_DEFAULT_SECURITY_INFORMATION):
# N.B. This query may fail with ERROR_INVALID_FUNCTION
# for some filesystems.
pSD = PSECURITY_DESCRIPTOR(needs_free=True)
error = advapi32.GetNamedSecurityInfoW(filename, SE_FILE_OBJECT, request,
ctypes.byref(pSD.pOwner), ctypes.byref(pSD.pGroup),
ctypes.byref(pSD.pDacl), ctypes.byref(pSD.pSacl),
ctypes.byref(pSD))
if error != 0:
raise ctypes.WinError(error)
return pSD
example usage
if __name__ == '__main__':
import os, sys
if len(sys.argv) < 2:
script_name = os.path.basename(__file__)
sys.exit('usage: {} filename'.format(script_name))
filename = sys.argv[1]
if isinstance(filename, bytes):
if hasattr(os, 'fsdecode'):
filename = os.fsdecode(filename)
else:
filename = filename.decode(sys.getfilesystemencoding())
pSD = get_file_security(filename)
owner_name, owner_domain, owner_sid_type = pSD.get_owner()
if owner_domain:
owner_name = '{}\\{}'.format(owner_domain, owner_name)
print("Path : {}".format(filename))
print("Owner: {} ({})".format(owner_name, owner_sid_type))
print("SID : {}".format(pSD.pOwner))
example output
Path : C:\Users
Owner: NT AUTHORITY\SYSTEM (WellKnownGroup)
SID : S-1-5-18
Path : C:\ProgramData
Owner: NT AUTHORITY\SYSTEM (WellKnownGroup)
SID : S-1-5-18
Path : C:\Program Files
Owner: NT SERVICE\TrustedInstaller (WellKnownGroup)
SID : S-1-5-80-956008885-3418522649-1831038044-1853292631-2271478464
Path : C:\Windows
Owner: NT SERVICE\TrustedInstaller (WellKnownGroup)
SID : S-1-5-80-956008885-3418522649-1831038044-1853292631-2271478464