source4/scripting/python/samba/idmap.py

   1 #!/usr/bin/env python
   2
   3 # Unix SMB/CIFS implementation.
   4 # Copyright (C) 2008 Kai Blin <kai@samba.org>
   5 #
   6 #
   7 # This program is free software; you can redistribute it and/or modify
   8 # it under the terms of the GNU General Public License as published by
   9 # the Free Software Foundation; either version 3 of the License, or
  10 # (at your option) any later version.
  11 #
  12 # This program is distributed in the hope that it will be useful,
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 # GNU General Public License for more details.
  16 #
  17 # You should have received a copy of the GNU General Public License
  18 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 #
  20
  21 """Convenience functions for using the idmap database."""
  22
  23 __docformat__ = "restructuredText"
  24
  25 import ldb
  26 import samba
  27
  28 class IDmapDB(samba.Ldb):
  29     """The IDmap database."""
  30
  31     # Mappings for ID_TYPE_UID, ID_TYPE_GID and ID_TYPE_BOTH
  32     TYPE_UID = 1
  33     TYPE_GID = 2
  34     TYPE_BOTH = 3
  35
  36     def __init__(self, url=None, lp=None, modules_dir=None, session_info=None,
  37                  credentials=None, flags=0, options=None):
  38         """Opens the IDMap Database
  39         For parameter meanings see the super class (samba.Ldb)
  40         """
  41
  42         self.lp = lp
  43         if url is None:
  44                 url = lp.private_path("idmap.ldb")
  45
  46         super(IDmapDB, self).__init__(url=url, lp=lp, modules_dir=modules_dir,
  47                 session_info=session_info, credentials=credentials, flags=flags,
  48                 options=options)
  49
  50     def connect(self, url=None, flags=0, options=None):
  51         super(IDmapDB, self).connect(url=self.lp.private_path(url), flags=flags,
  52                 options=options)
  53
  54
  55     def increment_xid(self):
  56         """Increment xidNumber, if not present it create and assign it to the lowerBound
  57
  58         :return xid can that be used for SID/unixid mapping
  59         """
  60         res = self.search(expression="dn=CN=CONFIG", base="",
  61                           scope=ldb.SCOPE_SUBTREE)
  62         id = res[0].get("xidNumber")
  63         flag = ldb.FLAG_MOD_REPLACE
  64         if id is None:
  65             id = res[0].get("lowerBound")
  66             flag = ldb.FLAG_MOD_ADD
  67         newid = int(str(id)) + 1
  68         msg = ldb.Message()
  69         msg.dn = ldb.Dn(self, "CN=CONFIG")
  70         msg["xidNumber"] = ldb.MessageElement(str(newid), flag, "xidNumber")
  71         self.modify(msg)
  72         return id
  73
  74     def setup_name_mapping(self, sid, type, unixid=None):
  75         """Setup a mapping between a sam name and a unix name.
  76
  77         :param sid: SID of the NT-side of the mapping.
  78         :param unixname: Unix id to map to, if none supplied the next one will be selected
  79         """
  80         if unixid is None:
  81             unixid = self.increment_xid()
  82         type_string = ""
  83         if type == self.TYPE_UID:
  84             type_string = "ID_TYPE_UID"
  85         elif type == self.TYPE_GID:
  86             type_string = "ID_TYPE_GID"
  87         elif type == self.TYPE_BOTH:
  88             type_string = "ID_TYPE_BOTH"
  89         else:
  90             return
  91
  92         mod = """
  93 dn: CN=%s
  94 xidNumber: %s
  95 objectSid: %s
  96 objectClass: sidMap
  97 type: %s
  98 cn: %s
  99
 100 """ % (sid, unixid, sid, type_string, sid)
 101         self.add(self.parse_ldif(mod).next()[1])
 102
 103