source4/scripting/bin/samba_spnupdate

   1 #!/usr/bin/env python
   2 #
   3 # update our servicePrincipalName names from spn_update_list
   4 #
   5 # Copyright (C) Andrew Tridgell 2010
   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 import os, sys
  22
  23 # ensure we get messages out immediately, so they get in the samba logs,
  24 # and don't get swallowed by a timeout
  25 os.putenv('PYTHONUNBUFFERED', '1')
  26
  27 # Find right directory when running from source tree
  28 sys.path.insert(0, "bin/python")
  29
  30 import samba, ldb
  31 import optparse
  32 from samba import getopt as options
  33 from samba.auth import system_session
  34 from samba.samdb import SamDB
  35
  36 parser = optparse.OptionParser("samba_spnupdate")
  37 sambaopts = options.SambaOptions(parser)
  38 parser.add_option_group(sambaopts)
  39 parser.add_option_group(options.VersionOptions(parser))
  40 parser.add_option("--verbose", action="store_true")
  41
  42 creds = None
  43 ccachename = None
  44
  45 opts, args = parser.parse_args()
  46
  47 if len(args) != 0:
  48     parser.print_usage()
  49     sys.exit(1)
  50
  51 lp = sambaopts.get_loadparm()
  52
  53 domain = lp.get("realm")
  54 host = lp.get("netbios name")
  55
  56
  57 # get the list of substitution vars
  58 def get_subst_vars(samdb):
  59     global lp
  60     vars = {}
  61
  62     vars['DNSDOMAIN'] = lp.get('realm').lower()
  63     vars['HOSTNAME']  = lp.get('netbios name').lower() + "." + vars['DNSDOMAIN']
  64     vars['NETBIOSNAME'] = lp.get('netbios name').upper()
  65     vars['WORKGROUP'] = lp.get('workgroup')
  66     vars['NTDSGUID']  = samdb.get_ntds_GUID()
  67     res = samdb.search(base=None, scope=ldb.SCOPE_BASE, attrs=["objectGUID"])
  68     guid = samdb.schema_format_value("objectGUID", res[0]['objectGUID'][0])
  69     vars['DOMAINGUID'] = guid
  70     return vars
  71
  72 try:
  73     samdb = SamDB(url=lp.get("sam database"), session_info=system_session(), lp=lp)
  74 except ldb.LdbError, (num, msg):
  75     print("Unable to open sam database %s : %s" % (lp.get("sam database")), msg)
  76     sys.exit(1)
  77
  78 # get the substitution dictionary
  79 sub_vars = get_subst_vars(samdb)
  80
  81 # get the list of SPN entries we should have
  82 spn_update_list = lp.private_path('spn_update_list')
  83
  84 file = open(spn_update_list, "r")
  85
  86 spn_list = []
  87
  88 # build the spn list
  89 for line in file:
  90     line = line.strip()
  91     if line == '' or line[0] == "#":
  92         continue
  93     line = samba.substitute_var(line, sub_vars)
  94     spn_list.append(line)
  95
  96 # get the current list of SPNs in our sam
  97 res = samdb.search(base="",
  98                    expression='(&(objectClass=computer)(samaccountname=%s$))' % sub_vars['NETBIOSNAME'],
  99                    attrs=["servicePrincipalName"])
 100 if not res or len(res) != 1:
 101     print("Failed to find computer object for %s$" % sub_vars['NETBIOSNAME'])
 102     sys.exit(1)
 103
 104 old_spns = []
 105 for s in res[0]['servicePrincipalName']:
 106     old_spns.append(s)
 107
 108 if opts.verbose:
 109     print("Existing SPNs: %s" % old_spns)
 110
 111 add_list = []
 112
 113 # work out what needs to be added
 114 for s in spn_list:
 115     in_list = False
 116     for s2 in old_spns:
 117         if s2.upper() == s.upper():
 118             in_list = True
 119             break
 120     if not in_list:
 121         add_list.append(s)
 122
 123 if opts.verbose:
 124     print("New SPNs: %s" % add_list)
 125
 126 if add_list == []:
 127     if opts.verbose:
 128         print("Nothing to add")
 129     sys.exit(0)
 130
 131 # build the modify request
 132 msg = ldb.Message()
 133 msg.dn = res[0]['dn']
 134 msg[""] = ldb.MessageElement(add_list,
 135                              ldb.FLAG_MOD_ADD, "servicePrincipalName")
 136 res = samdb.modify(msg)
 137 sys.exit(0)