python/samba/gp_ext_loader.py

   1 # Group Policy Client Side Extension Loader
   2 # Copyright (C) David Mulder <dmulder@suse.com> 2018
   3 #
   4 # This program is free software; you can redistribute it and/or modify
   5 # it under the terms of the GNU General Public License as published by
   6 # the Free Software Foundation; either version 3 of the License, or
   7 # (at your option) any later version.
   8 #
   9 # This program is distributed in the hope that it will be useful,
  10 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 # GNU General Public License for more details.
  13 #
  14 # You should have received a copy of the GNU General Public License
  15 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16
  17 import os
  18 from samba.gpclass import list_gp_extensions
  19 from samba.gpclass import gp_ext
  20
  21 try:
  22     import importlib.util
  23
  24     def import_file(name, location):
  25         spec = importlib.util.spec_from_file_location(name, location)
  26         module = importlib.util.module_from_spec(spec)
  27         spec.loader.exec_module(module)
  28         return module
  29 except ImportError:
  30     import imp
  31
  32     def import_file(name, location):
  33         return imp.load_source(name, location)
  34
  35
  36 def get_gp_ext_from_module(name, mod):
  37     if mod:
  38         for k, v in vars(mod).items():
  39             if k == name and issubclass(v, gp_ext):
  40                 return v
  41     return None
  42
  43
  44 def get_gp_client_side_extensions(logger, smb_conf):
  45     user_exts = []
  46     machine_exts = []
  47     gp_exts = list_gp_extensions(smb_conf)
  48     for gp_ext in gp_exts.values():
  49         module = import_file(gp_ext['ProcessGroupPolicy'], gp_ext['DllName'])
  50         ext = get_gp_ext_from_module(gp_ext['ProcessGroupPolicy'], module)
  51         if ext and gp_ext['MachinePolicy']:
  52             machine_exts.append(ext)
  53             logger.info('Loaded machine extension from %s: %s'
  54                         % (gp_ext['DllName'], ext.__name__))
  55         if ext and gp_ext['UserPolicy']:
  56             user_exts.append(ext)
  57             logger.info('Loaded user extension from %s: %s'
  58                         % (gp_ext['DllName'], ext.__name__))
  59     return (machine_exts, user_exts)