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"""
A module built to test if the current process has the privilege to
create symlinks on Windows.
"""
# allow script to run natively under python 2.6+
from __future__ import print_function
import ctypes
from ctypes import wintypes
GetCurrentProcess = ctypes.windll.kernel32.GetCurrentProcess
GetCurrentProcess.restype = wintypes.HANDLE
OpenProcessToken = ctypes.windll.advapi32.OpenProcessToken
OpenProcessToken.argtypes = (wintypes.HANDLE, wintypes.DWORD,
ctypes.POINTER(wintypes.HANDLE))
OpenProcessToken.restype = wintypes.BOOL
class LUID(ctypes.Structure):
_fields_ = [
('low_part', wintypes.DWORD),
('high_part', wintypes.LONG),
]
def __eq__(self, other):
return (
self.high_part == other.high_part and
self.low_part == other.low_part
)
def __ne__(self, other):
return not (self==other)
LookupPrivilegeValue = ctypes.windll.advapi32.LookupPrivilegeValueW
LookupPrivilegeValue.argtypes = (
wintypes.LPWSTR, # system name
wintypes.LPWSTR, # name
ctypes.POINTER(LUID),
)
LookupPrivilegeValue.restype = wintypes.BOOL
class TOKEN_INFORMATION_CLASS:
TokenUser = 1
TokenGroups = 2
TokenPrivileges = 3
# ... see http://msdn.microsoft.com/en-us/library/aa379626%28VS.85%29.aspx
SE_PRIVILEGE_ENABLED_BY_DEFAULT = (0x00000001)
SE_PRIVILEGE_ENABLED = (0x00000002)
SE_PRIVILEGE_REMOVED = (0x00000004)
SE_PRIVILEGE_USED_FOR_ACCESS = (0x80000000)
class LUID_AND_ATTRIBUTES(ctypes.Structure):
_fields_ = [
('LUID', LUID),
('attributes', wintypes.DWORD),
]
def is_enabled(self):
return bool(self.attributes & SE_PRIVILEGE_ENABLED)
def enable(self):
self.attributes |= SE_PRIVILEGE_ENABLED
def get_name(self):
size = wintypes.DWORD(10240)
buf = ctypes.create_unicode_buffer(size.value)
res = LookupPrivilegeName(None, self.LUID, buf, size)
if res == 0:
raise RuntimeError
return buf[:size.value]
def __str__(self):
name = self.name
fmt = ['{name}', '{name} (enabled)'][self.is_enabled()]
return fmt.format(**vars())
LookupPrivilegeName = ctypes.windll.advapi32.LookupPrivilegeNameW
LookupPrivilegeName.argtypes = (
wintypes.LPWSTR, # lpSystemName
ctypes.POINTER(LUID), # lpLuid
wintypes.LPWSTR, # lpName
ctypes.POINTER(wintypes.DWORD), #cchName
)
LookupPrivilegeName.restype = wintypes.BOOL
class TOKEN_PRIVILEGES(ctypes.Structure):
_fields_ = [
('count', wintypes.DWORD),
('privileges', LUID_AND_ATTRIBUTES*0),
]
def get_array(self):
array_type = LUID_AND_ATTRIBUTES*self.count
privileges = ctypes.cast(self.privileges,
ctypes.POINTER(array_type)).contents
return privileges
def __iter__(self):
return iter(self.get_array())
PTOKEN_PRIVILEGES = ctypes.POINTER(TOKEN_PRIVILEGES)
GetTokenInformation = ctypes.windll.advapi32.GetTokenInformation
GetTokenInformation.argtypes = [
wintypes.HANDLE, # TokenHandle
ctypes.c_uint, # TOKEN_INFORMATION_CLASS value
ctypes.c_void_p, # TokenInformation
wintypes.DWORD, # TokenInformationLength
ctypes.POINTER(wintypes.DWORD), # ReturnLength
]
GetTokenInformation.restype = wintypes.BOOL
# http://msdn.microsoft.com/en-us/library/aa375202%28VS.85%29.aspx
AdjustTokenPrivileges = ctypes.windll.advapi32.AdjustTokenPrivileges
AdjustTokenPrivileges.restype = wintypes.BOOL
AdjustTokenPrivileges.argtypes = [
wintypes.HANDLE, # TokenHandle
wintypes.BOOL, # DisableAllPrivileges
PTOKEN_PRIVILEGES, # NewState (optional)
wintypes.DWORD, # BufferLength of PreviousState
PTOKEN_PRIVILEGES, # PreviousState (out, optional)
ctypes.POINTER(wintypes.DWORD), # ReturnLength
]
def get_process_token():
"Get the current process token"
token = wintypes.HANDLE()
TOKEN_ALL_ACCESS = 0xf01ff
res = OpenProcessToken(GetCurrentProcess(), TOKEN_ALL_ACCESS, token)
if not res > 0:
raise RuntimeError("Couldn't get process token")
return token
def get_symlink_luid():
"Get the LUID for the SeCreateSymbolicLinkPrivilege"
symlink_luid = LUID()
res = LookupPrivilegeValue(None, "SeCreateSymbolicLinkPrivilege",
symlink_luid)
if not res > 0:
raise RuntimeError("Couldn't lookup privilege value")
return symlink_luid
def get_privilege_information():
"Get all privileges associated with the current process."
# first call with zero length to determine what size buffer we need
return_length = wintypes.DWORD()
params = [
get_process_token(),
TOKEN_INFORMATION_CLASS.TokenPrivileges,
None,
0,
return_length,
]
res = GetTokenInformation(*params)
# assume we now have the necessary length in return_length
buffer = ctypes.create_string_buffer(return_length.value)
params[2] = buffer
params[3] = return_length.value
res = GetTokenInformation(*params)
assert res > 0, "Error in second GetTokenInformation (%d)" % res
privileges = ctypes.cast(buffer, ctypes.POINTER(TOKEN_PRIVILEGES)).contents
return privileges
def report_privilege_information():
"Report all privilege information assigned to the current process."
privileges = get_privilege_information()
print("found {0} privileges".format(privileges.count))
tuple(map(print, privileges))
def enable_symlink_privilege():
"""
Try to assign the symlink privilege to the current process token.
Return True if the assignment is successful.
"""
# create a space in memory for a TOKEN_PRIVILEGES structure
# with one element
size = ctypes.sizeof(TOKEN_PRIVILEGES)
size += ctypes.sizeof(LUID_AND_ATTRIBUTES)
buffer = ctypes.create_string_buffer(size)
tp = ctypes.cast(buffer, ctypes.POINTER(TOKEN_PRIVILEGES)).contents
tp.count = 1
tp.get_array()[0].enable()
tp.get_array()[0].LUID = get_symlink_luid()
token = get_process_token()
res = AdjustTokenPrivileges(token, False, tp, 0, None, None)
if res == 0:
raise RuntimeError("Error in AdjustTokenPrivileges")
ERROR_NOT_ALL_ASSIGNED = 1300
return ctypes.windll.kernel32.GetLastError() != ERROR_NOT_ALL_ASSIGNED
def main():
assigned = enable_symlink_privilege()
msg = ['failure', 'success'][assigned]
print("Symlink privilege assignment completed with {0}".format(msg))
if __name__ == '__main__':
main()
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