python/samba/gp_sudoers_ext.py

   1 # gp_sudoers_ext samba gpo policy
   2 # Copyright (C) David Mulder <dmulder@suse.com> 2020
   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 gp_pol_ext
  19 from base64 import b64encode
  20 from tempfile import NamedTemporaryFile
  21 from subprocess import Popen, PIPE
  22
  23 def find_executable(executable, path):
  24     paths = path.split(os.pathsep)
  25     for p in paths:
  26         f = os.path.join(p, executable)
  27         if os.path.isfile(f):
  28             return f
  29     return None
  30
  31 intro = '''
  32 ### autogenerated by samba
  33 #
  34 # This file is generated by the gp_sudoers_ext Group Policy
  35 # Client Side Extension. To modify the contents of this file,
  36 # modify the appropriate Group Policy objects which apply
  37 # to this machine. DO NOT MODIFY THIS FILE DIRECTLY.
  38 #
  39
  40 '''
  41 visudo = find_executable('visudo',
  42         path='%s:%s' % (os.environ['PATH'], '/usr/sbin'))
  43
  44 class gp_sudoers_ext(gp_pol_ext):
  45     def __str__(self):
  46         return 'Unix Settings/Sudo Rights'
  47
  48     def process_group_policy(self, deleted_gpo_list, changed_gpo_list,
  49             sdir='/etc/sudoers.d'):
  50         for guid, settings in deleted_gpo_list:
  51             self.gp_db.set_guid(guid)
  52             if str(self) in settings:
  53                 for attribute, sudoers in settings[str(self)].items():
  54                     if os.path.exists(sudoers):
  55                         os.unlink(sudoers)
  56                     self.gp_db.delete(str(self), attribute)
  57             self.gp_db.commit()
  58
  59         for gpo in changed_gpo_list:
  60             if gpo.file_sys_path:
  61                 section = 'Software\\Policies\\Samba\\Unix Settings\\Sudo Rights'
  62                 self.gp_db.set_guid(gpo.name)
  63                 pol_file = 'MACHINE/Registry.pol'
  64                 path = os.path.join(gpo.file_sys_path, pol_file)
  65                 pol_conf = self.parse(path)
  66                 if not pol_conf:
  67                     continue
  68                 for e in pol_conf.entries:
  69                     if e.keyname == section and e.data.strip():
  70                         attribute = b64encode(e.data.encode()).decode()
  71                         old_val = self.gp_db.retrieve(str(self), attribute)
  72                         if not old_val:
  73                             contents = intro
  74                             contents += '%s\n' % e.data
  75                             with NamedTemporaryFile() as f:
  76                                 with open(f.name, 'w') as w:
  77                                     w.write(contents)
  78                                 sudo_validation = \
  79                                         Popen([visudo, '-c', '-f', f.name],
  80                                             stdout=PIPE, stderr=PIPE).wait()
  81                             if sudo_validation == 0:
  82                                 with NamedTemporaryFile(prefix='gp_',
  83                                                         delete=False,
  84                                                         dir=sdir) as f:
  85                                     with open(f.name, 'w') as w:
  86                                         w.write(contents)
  87                                     self.gp_db.store(str(self),
  88                                                      attribute,
  89                                                      f.name)
  90                             else:
  91                                 self.logger.warn('Sudoers apply "%s" failed'
  92                                         % e.data)
  93                         self.gp_db.commit()
  94
  95     def rsop(self, gpo):
  96         output = {}
  97         pol_file = 'MACHINE/Registry.pol'
  98         if gpo.file_sys_path:
  99             path = os.path.join(gpo.file_sys_path, pol_file)
 100             pol_conf = self.parse(path)
 101             if not pol_conf:
 102                 return output
 103             for e in pol_conf.entries:
 104                 key = e.keyname.split('\\')[-1]
 105                 if key.endswith('Sudo Rights') and e.data.strip():
 106                     if key not in output.keys():
 107                         output[key] = []
 108                     output[key].append(e.data)
 109         return output