source4/scripting/python/samba/schema.py

   1 #
   2 # Unix SMB/CIFS implementation.
   3 # backend code for provisioning a Samba4 server
   4 #
   5 # Copyright (C) Jelmer Vernooij <jelmer@samba.org> 2007-2008
   6 # Copyright (C) Andrew Bartlett <abartlet@samba.org> 2008-2009
   7 # Copyright (C) Oliver Liebel <oliver@itc.li> 2008-2009
   8 #
   9 # Based on the original in EJS:
  10 # Copyright (C) Andrew Tridgell <tridge@samba.org> 2005
  11 #
  12 # This program is free software; you can redistribute it and/or modify
  13 # it under the terms of the GNU General Public License as published by
  14 # the Free Software Foundation; either version 3 of the License, or
  15 # (at your option) any later version.
  16 #
  17 # This program is distributed in the hope that it will be useful,
  18 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 # GNU General Public License for more details.
  21 #
  22 # You should have received a copy of the GNU General Public License
  23 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  24 #
  25
  26 """Functions for setting up a Samba Schema."""
  27
  28 from base64 import b64encode
  29 from ms_schema import read_ms_schema
  30 from samba.dcerpc import security
  31 from samba import read_and_sub_file, substitute_var, check_all_substituted
  32 from samba import Ldb
  33 from samba.ndr import ndr_pack
  34 from ldb import SCOPE_SUBTREE, SCOPE_ONELEVEL
  35 import os
  36
  37 def get_schema_descriptor(domain_sid):
  38     sddl = "O:SAG:SAD:AI(OA;;CR;89e95b76-444d-4c62-991a-0facbeda640c" \
  39            ";;ER)(OA;;CR;1131f6aa-9c07-11d1-f79f-00c04fc2dcd2;;ER)(OA;;CR;1131f6ad-9c07-1" \
  40            "1d1-f79f-00c04fc2dcd2;;ER)(OA;;CR;e12b56b6-0a95-11d1-adbb-00c04fd8d5cd;;SA)(O" \
  41            "A;;CR;89e95b76-444d-4c62-991a-0facbeda640c;;BA)(OA;;CR;1131f6aa-9c07-11d1-f79" \
  42            "f-00c04fc2dcd2;;BA)(OA;;CR;1131f6ab-9c07-11d1-f79f-00c04fc2dcd2;;BA)(OA;;CR;1" \
  43            "131f6ac-9c07-11d1-f79f-00c04fc2dcd2;;BA)(OA;;CR;1131f6ad-9c07-11d1-f79f-00c04" \
  44            "fc2dcd2;;BA)(OA;;CR;89e95b76-444d-4c62-991a-0facbeda640c;;ED)(OA;;CR;1131f6aa" \
  45            "-9c07-11d1-f79f-00c04fc2dcd2;;ED)(OA;;CR;1131f6ab-9c07-11d1-f79f-00c04fc2dcd2" \
  46            ";;ED)(OA;;CR;1131f6ac-9c07-11d1-f79f-00c04fc2dcd2;;ED)(OA;;CR;1131f6ad-9c07-1" \
  47            "1d1-f79f-00c04fc2dcd2;;ED)(A;;RPWPCCDCLCLORCWOWDSDDTSW;;;LA)(A;CI;RPWPCRCCLCL" \
  48            "ORCWOWDSW;;;SA)(A;CI;RPLCLORC;;;AU)(A;CI;RPWPCRCCDCLCLORCWOWDSDDTSW;;;SY)S:(O" \
  49            "U;SA;CR;45ec5156-db7e-47bb-b53f-dbeb2d03c40f;;WD)(OU;SA;CR;e12b56b6-0a95-11d1" \
  50            "-adbb-00c04fd8d5cd;;WD)(AU;SA;CR;;;DU)(AU;SA;CR;;;BA)(AU;SA;WPCCDCWOWDSDDTSW;" \
  51            ";;WD)(AU;CISA;WP;;;WD)"
  52     sec = security.descriptor.from_sddl(sddl, domain_sid)
  53     return ndr_pack(sec)
  54
  55
  56 class Schema(object):
  57     def __init__(self, setup_path, domain_sid, schemadn=None,
  58                  serverdn=None, files=None, prefixmap=None):
  59         """Load schema for the SamDB from the AD schema files and samba4_schema.ldif
  60
  61         :param samdb: Load a schema into a SamDB.
  62         :param setup_path: Setup path function.
  63         :param schemadn: DN of the schema
  64         :param serverdn: DN of the server
  65
  66         Returns the schema data loaded, to avoid double-parsing when then needing to add it to the db
  67         """
  68
  69         self.schemadn = schemadn
  70         self.ldb = Ldb()
  71         self.schema_data = read_ms_schema(setup_path('ad-schema/MS-AD_Schema_2K8_R2_Attributes.txt'),
  72                                           setup_path('ad-schema/MS-AD_Schema_2K8_R2_Classes.txt'))
  73
  74         if files is not None:
  75             for file in files:
  76                 self.schema_data += open(file, 'r').read()
  77
  78         self.schema_data = substitute_var(self.schema_data, {"SCHEMADN": schemadn})
  79         check_all_substituted(self.schema_data)
  80
  81         self.schema_dn_modify = read_and_sub_file(setup_path("provision_schema_basedn_modify.ldif"),
  82                                                   {"SCHEMADN": schemadn,
  83                                                    "SERVERDN": serverdn,
  84                                                    })
  85
  86         descr = b64encode(get_schema_descriptor(domain_sid))
  87         self.schema_dn_add = read_and_sub_file(setup_path("provision_schema_basedn.ldif"),
  88                                                {"SCHEMADN": schemadn,
  89                                                 "DESCRIPTOR": descr
  90                                                 })
  91
  92         self.prefixmap_data = open(setup_path("prefixMap.txt"), 'r').read()
  93
  94         if prefixmap is not None:
  95             for map in prefixmap:
  96                 self.prefixmap_data += "%s\n" % map
  97
  98         self.prefixmap_data = b64encode(self.prefixmap_data)
  99
 100
 101
 102         # We don't actually add this ldif, just parse it
 103         prefixmap_ldif = "dn: cn=schema\nprefixMap:: %s\n\n" % self.prefixmap_data
 104         self.ldb.set_schema_from_ldif(prefixmap_ldif, self.schema_data)
 105
 106     def write_to_tmp_ldb(self, schemadb_path):
 107         self.ldb.connect(schemadb_path)
 108         self.ldb.transaction_start()
 109
 110         self.ldb.add_ldif("""dn: @ATTRIBUTES
 111 linkID: INTEGER
 112
 113 dn: @INDEXLIST
 114 @IDXATTR: linkID
 115 @IDXATTR: attributeSyntax
 116 """)
 117         # These bits of LDIF are supplied when the Schema object is created
 118         self.ldb.add_ldif(self.schema_dn_add)
 119         self.ldb.modify_ldif(self.schema_dn_modify)
 120         self.ldb.add_ldif(self.schema_data)
 121         self.ldb.transaction_commit()
 122
 123     # Return a hash with the forward attribute as a key and the back as the value
 124     def linked_attributes(self):
 125         return get_linked_attributes(self.schemadn, self.ldb)
 126
 127     def dnsyntax_attributes(self):
 128         return get_dnsyntax_attributes(self.schemadn, self.ldb)
 129
 130 # Return a hash with the forward attribute as a key and the back as the value
 131 def get_linked_attributes(schemadn,schemaldb):
 132     attrs = ["linkID", "lDAPDisplayName"]
 133     res = schemaldb.search(expression="(&(linkID=*)(!(linkID:1.2.840.113556.1.4.803:=1))(objectclass=attributeSchema)(attributeSyntax=2.5.5.1))", base=schemadn, scope=SCOPE_ONELEVEL, attrs=attrs)
 134     attributes = {}
 135     for i in range (0, len(res)):
 136         expression = "(&(objectclass=attributeSchema)(linkID=%d)(attributeSyntax=2.5.5.1))" % (int(res[i]["linkID"][0])+1)
 137         target = schemaldb.searchone(basedn=schemadn,
 138                                      expression=expression,
 139                                      attribute="lDAPDisplayName",
 140                                      scope=SCOPE_SUBTREE)
 141         if target is not None:
 142             attributes[str(res[i]["lDAPDisplayName"])]=str(target)
 143
 144     return attributes
 145
 146 def get_dnsyntax_attributes(schemadn,schemaldb):
 147     attrs = ["linkID", "lDAPDisplayName"]
 148     res = schemaldb.search(expression="(&(!(linkID=*))(objectclass=attributeSchema)(attributeSyntax=2.5.5.1))", base=schemadn, scope=SCOPE_ONELEVEL, attrs=attrs)
 149     attributes = []
 150     for i in range (0, len(res)):
 151         attributes.append(str(res[i]["lDAPDisplayName"]))
 152
 153     return attributes
 154
 155 def ldb_with_schema(setup_dir=None, schemadn="cn=schema,cn=configuration,dc=example,dc=com",
 156                     serverdn="cn=server,cn=servers,cn=default-first-site-name,cn=sites,cn=cn=configuration,dc=example,dc=com",
 157                     domainsid=None):
 158     """Load schema for the SamDB from the AD schema files and samba4_schema.ldif
 159
 160     :param setup_dir: Setup path
 161     :param schemadn: DN of the schema
 162     :param serverdn: DN of the server
 163
 164     Returns the schema data loaded as an object, with .ldb being a
 165     new ldb with the schema loaded.  This allows certain tests to
 166     operate without a remote or local schema.
 167     """
 168
 169     def setup_path(file):
 170         return os.path.join(setup_dir, file)
 171
 172     if domainsid is None:
 173         domainsid = security.random_sid()
 174     else:
 175         domainsid = security.dom_sid(domainsid)
 176     return Schema(setup_path, domainsid, schemadn=schemadn, serverdn=serverdn)