source4/scripting/python/samba/__init__.py

   1 #!/usr/bin/python
   2
   3 # Unix SMB/CIFS implementation.
   4 # Copyright (C) Jelmer Vernooij <jelmer@samba.org> 2007-2008
   5 #
   6 # Based on the original in EJS:
   7 # Copyright (C) Andrew Tridgell <tridge@samba.org> 2005
   8 #
   9 # This program is free software; you can redistribute it and/or modify
  10 # it under the terms of the GNU General Public License as published by
  11 # the Free Software Foundation; either version 3 of the License, or
  12 # (at your option) any later version.
  13 #
  14 # This program is distributed in the hope that it will be useful,
  15 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 # GNU General Public License for more details.
  18 #
  19 # You should have received a copy of the GNU General Public License
  20 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 #
  22
  23 """Samba 4."""
  24
  25 __docformat__ = "restructuredText"
  26
  27 import os
  28 import sys
  29
  30 def _in_source_tree():
  31     """Check whether the script is being run from the source dir. """
  32     return os.path.exists("%s/../../../selftest/skip" % os.path.dirname(__file__))
  33
  34
  35 # When running, in-tree, make sure bin/python is in the PYTHONPATH
  36 if _in_source_tree():
  37     srcdir = "%s/../../.." % os.path.dirname(__file__)
  38     sys.path.append("%s/bin/python" % srcdir)
  39     default_ldb_modules_dir = "%s/bin/modules/ldb" % srcdir
  40 else:
  41     default_ldb_modules_dir = None
  42
  43
  44 import ldb
  45 import dsdb
  46 import _glue
  47 from samba._ldb import Ldb as _Ldb
  48
  49 class Ldb(_Ldb):
  50     """Simple Samba-specific LDB subclass that takes care
  51     of setting up the modules dir, credentials pointers, etc.
  52
  53     Please note that this is intended to be for all Samba LDB files,
  54     not necessarily the Sam database. For Sam-specific helper
  55     functions see samdb.py.
  56     """
  57     def __init__(self, url=None, lp=None, modules_dir=None, session_info=None,
  58                  credentials=None, flags=0, options=None):
  59         """Opens a Samba Ldb file.
  60
  61         :param url: Optional LDB URL to open
  62         :param lp: Optional loadparm object
  63         :param modules_dir: Optional modules directory
  64         :param session_info: Optional session information
  65         :param credentials: Optional credentials, defaults to anonymous.
  66         :param flags: Optional LDB flags
  67         :param options: Additional options (optional)
  68
  69         This is different from a regular Ldb file in that the Samba-specific
  70         modules-dir is used by default and that credentials and session_info
  71         can be passed through (required by some modules).
  72         """
  73
  74         if modules_dir is not None:
  75             self.set_modules_dir(modules_dir)
  76         elif default_ldb_modules_dir is not None:
  77             self.set_modules_dir(default_ldb_modules_dir)
  78         elif lp is not None:
  79             self.set_modules_dir(os.path.join(lp.get("modules dir"), "ldb"))
  80
  81         if session_info is not None:
  82             self.set_session_info(session_info)
  83
  84         if credentials is not None:
  85             self.set_credentials(credentials)
  86
  87         if lp is not None:
  88             self.set_loadparm(lp)
  89
  90         # This must be done before we load the schema, as these handlers for
  91         # objectSid and objectGUID etc must take precedence over the 'binary
  92         # attribute' declaration in the schema
  93         self.register_samba_handlers()
  94
  95         # TODO set debug
  96         def msg(l,text):
  97             print text
  98         #self.set_debug(msg)
  99
 100         self.set_utf8_casefold()
 101
 102         # Allow admins to force non-sync ldb for all databases
 103         if lp is not None:
 104             nosync_p = lp.get("nosync", "ldb")
 105             if nosync_p is not None and nosync_p == True:
 106                 flags |= ldb.FLG_NOSYNC
 107
 108         self.set_create_perms()
 109
 110         if url is not None:
 111             self.connect(url, flags, options)
 112
 113     def set_create_perms(self, perms=0600):
 114         # we usually want Samba databases to be private. If we later find we
 115         # need one public, we will have to change this here
 116         super(Ldb, self).set_create_perms(perms)
 117
 118     def searchone(self, attribute, basedn=None, expression=None,
 119                   scope=ldb.SCOPE_BASE):
 120         """Search for one attribute as a string.
 121
 122         :param basedn: BaseDN for the search.
 123         :param attribute: Name of the attribute
 124         :param expression: Optional search expression.
 125         :param scope: Search scope (defaults to base).
 126         :return: Value of attribute as a string or None if it wasn't found.
 127         """
 128         res = self.search(basedn, scope, expression, [attribute])
 129         if len(res) != 1 or res[0][attribute] is None:
 130             return None
 131         values = set(res[0][attribute])
 132         assert len(values) == 1
 133         return self.schema_format_value(attribute, values.pop())
 134
 135     def erase_users_computers(self, dn):
 136         """Erases user and computer objects from our AD. This is needed since the 'samldb' module denies the deletion of primary groups. Therefore all groups shouldn't be primary somewhere anymore."""
 137
 138         try:
 139             res = self.search(base=dn, scope=ldb.SCOPE_SUBTREE, attrs=[],
 140                       expression="(|(objectclass=user)(objectclass=computer))")
 141         except ldb.LdbError, (errno, _):
 142             if errno == ldb.ERR_NO_SUCH_OBJECT:
 143                 # Ignore no such object errors
 144                 return
 145             else:
 146                 raise
 147
 148         try:
 149             for msg in res:
 150                 self.delete(msg.dn)
 151         except ldb.LdbError, (errno, _):
 152             if errno != ldb.ERR_NO_SUCH_OBJECT:
 153                 # Ignore no such object errors
 154                 raise
 155
 156     def erase_except_schema_controlled(self):
 157         """Erase this ldb, removing all records, except those that are controlled by Samba4's schema."""
 158
 159         basedn = ""
 160
 161         # Try to delete user/computer accounts to allow deletion of groups
 162         self.erase_users_computers(basedn)
 163
 164         # Delete the 'visible' records, and the invisble 'deleted' records (if this DB supports it)
 165         for msg in self.search(basedn, ldb.SCOPE_SUBTREE,
 166                                "(&(|(objectclass=*)(distinguishedName=*))(!(distinguishedName=@BASEINFO)))",
 167                                [], controls=["show_deleted:0"]):
 168             try:
 169                 self.delete(msg.dn)
 170             except ldb.LdbError, (errno, _):
 171                 if errno != ldb.ERR_NO_SUCH_OBJECT:
 172                     # Ignore no such object errors
 173                     raise
 174
 175         res = self.search(basedn, ldb.SCOPE_SUBTREE,
 176                           "(&(|(objectclass=*)(distinguishedName=*))(!(distinguishedName=@BASEINFO)))",
 177                           [], controls=["show_deleted:0"])
 178         assert len(res) == 0
 179
 180         # delete the specials
 181         for attr in ["@SUBCLASSES", "@MODULES",
 182                      "@OPTIONS", "@PARTITION", "@KLUDGEACL"]:
 183             try:
 184                 self.delete(attr)
 185             except ldb.LdbError, (errno, _):
 186                 if errno != ldb.ERR_NO_SUCH_OBJECT:
 187                     # Ignore missing dn errors
 188                     raise
 189
 190     def erase(self):
 191         """Erase this ldb, removing all records."""
 192
 193         self.erase_except_schema_controlled()
 194
 195         # delete the specials
 196         for attr in ["@INDEXLIST", "@ATTRIBUTES"]:
 197             try:
 198                 self.delete(attr)
 199             except ldb.LdbError, (errno, _):
 200                 if errno != ldb.ERR_NO_SUCH_OBJECT:
 201                     # Ignore missing dn errors
 202                     raise
 203
 204     def erase_partitions(self):
 205         """Erase an ldb, removing all records."""
 206
 207         def erase_recursive(self, dn):
 208             try:
 209                 res = self.search(base=dn, scope=ldb.SCOPE_ONELEVEL, attrs=[],
 210                                   controls=["show_deleted:0"])
 211             except ldb.LdbError, (errno, _):
 212                 if errno == ldb.ERR_NO_SUCH_OBJECT:
 213                     # Ignore no such object errors
 214                     return
 215
 216             for msg in res:
 217                 erase_recursive(self, msg.dn)
 218
 219             try:
 220                 self.delete(dn)
 221             except ldb.LdbError, (errno, _):
 222                 if errno != ldb.ERR_NO_SUCH_OBJECT:
 223                     # Ignore no such object errors
 224                     raise
 225
 226         res = self.search("", ldb.SCOPE_BASE, "(objectClass=*)",
 227                          ["namingContexts"])
 228         assert len(res) == 1
 229         if not "namingContexts" in res[0]:
 230             return
 231         for basedn in res[0]["namingContexts"]:
 232             # Try to delete user/computer accounts to allow deletion of groups
 233             self.erase_users_computers(basedn)
 234             # Try and erase from the bottom-up in the tree
 235             erase_recursive(self, basedn)
 236
 237     def load_ldif_file_add(self, ldif_path):
 238         """Load a LDIF file.
 239
 240         :param ldif_path: Path to LDIF file.
 241         """
 242         self.add_ldif(open(ldif_path, 'r').read())
 243
 244     def add_ldif(self, ldif, controls=None):
 245         """Add data based on a LDIF string.
 246
 247         :param ldif: LDIF text.
 248         """
 249         for changetype, msg in self.parse_ldif(ldif):
 250             assert changetype == ldb.CHANGETYPE_NONE
 251             self.add(msg,controls)
 252
 253     def modify_ldif(self, ldif, controls=None):
 254         """Modify database based on a LDIF string.
 255
 256         :param ldif: LDIF text.
 257         """
 258         for changetype, msg in self.parse_ldif(ldif):
 259             if (changetype == ldb.CHANGETYPE_ADD):
 260                 self.add(msg, controls)
 261             else:
 262                 self.modify(msg, controls)
 263
 264     def set_domain_sid(self, sid):
 265         """Change the domain SID used by this LDB.
 266
 267         :param sid: The new domain sid to use.
 268         """
 269         dsdb.samdb_set_domain_sid(self, sid)
 270
 271     def domain_sid(self):
 272         """Read the domain SID used by this LDB.
 273
 274         """
 275         dsdb.samdb_get_domain_sid(self)
 276
 277     def set_schema_from_ldif(self, pf, df):
 278         _glue.dsdb_set_schema_from_ldif(self, pf, df)
 279
 280     def get_oid_from_attid(self, attid):
 281         return dsdb.dsdb_get_oid_from_attid(self, attid)
 282
 283     def set_schema_from_ldb(self, ldb):
 284         _glue.dsdb_set_schema_from_ldb(self, ldb)
 285
 286     def write_prefixes_from_schema(self):
 287         _glue.dsdb_write_prefixes_from_schema_to_ldb(self)
 288
 289     def set_schema_info(self):
 290         _glue.dsdb_schema_info_reset(self)
 291
 292     def convert_schema_to_openldap(self, target, mapping):
 293         return dsdb.dsdb_convert_schema_to_openldap(self, target, mapping)
 294
 295     def set_invocation_id(self, invocation_id):
 296         """Set the invocation id for this SamDB handle.
 297
 298         :param invocation_id: GUID of the invocation id.
 299         """
 300         dsdb.dsdb_set_ntds_invocation_id(self, invocation_id)
 301
 302     def get_invocation_id(self):
 303         "Get the invocation_id id"
 304         return dsdb.samdb_ntds_invocation_id(self)
 305
 306     def get_ntds_GUID(self):
 307         "Get the NTDS objectGUID"
 308         return dsdb.samdb_ntds_objectGUID(self)
 309
 310     def server_site_name(self):
 311         "Get the server site name"
 312         return dsdb.samdb_server_site_name(self)
 313
 314
 315 def substitute_var(text, values):
 316     """substitute strings of the form ${NAME} in str, replacing
 317     with substitutions from subobj.
 318
 319     :param text: Text in which to subsitute.
 320     :param values: Dictionary with keys and values.
 321     """
 322
 323     for (name, value) in values.items():
 324         assert isinstance(name, str), "%r is not a string" % name
 325         assert isinstance(value, str), "Value %r for %s is not a string" % (value, name)
 326         text = text.replace("${%s}" % name, value)
 327
 328     return text
 329
 330
 331 def check_all_substituted(text):
 332     """Make sure that all substitution variables in a string have been replaced.
 333     If not, raise an exception.
 334
 335     :param text: The text to search for substitution variables
 336     """
 337     if not "${" in text:
 338         return
 339
 340     var_start = text.find("${")
 341     var_end = text.find("}", var_start)
 342
 343     raise Exception("Not all variables substituted: %s" % text[var_start:var_end+1])
 344
 345
 346 def read_and_sub_file(file, subst_vars):
 347     """Read a file and sub in variables found in it
 348
 349     :param file: File to be read (typically from setup directory)
 350      param subst_vars: Optional variables to subsitute in the file.
 351     """
 352     data = open(file, 'r').read()
 353     if subst_vars is not None:
 354         data = substitute_var(data, subst_vars)
 355         check_all_substituted(data)
 356     return data
 357
 358
 359 def setup_file(template, fname, subst_vars=None):
 360     """Setup a file in the private dir.
 361
 362     :param template: Path of the template file.
 363     :param fname: Path of the file to create.
 364     :param subst_vars: Substitution variables.
 365     """
 366     f = fname
 367
 368     if os.path.exists(f):
 369         os.unlink(f)
 370
 371     data = read_and_sub_file(template, subst_vars)
 372     open(f, 'w').write(data)
 373
 374
 375 def valid_netbios_name(name):
 376     """Check whether a name is valid as a NetBIOS name. """
 377     # See crh's book (1.4.1.1)
 378     if len(name) > 15:
 379         return False
 380     for x in name:
 381         if not x.isalnum() and not x in " !#$%&'()-.@^_{}~":
 382             return False
 383     return True
 384
 385
 386 def ensure_external_module(modulename, location):
 387     """Add a location to sys.path if an external dependency can't be found.
 388
 389     :param modulename: Module name to import
 390     :param location: Location to add to sys.path (can be relative to
 391         ${srcdir}/lib
 392     """
 393     try:
 394         __import__(modulename)
 395     except ImportError:
 396         import sys
 397         if _in_source_tree():
 398             sys.path.insert(0,
 399                 os.path.join(os.path.dirname(__file__),
 400                              "../../../../lib", location))
 401             __import__(modulename)
 402         else:
 403             sys.modules[modulename] = __import__(
 404                 "samba.external.%s" % modulename, fromlist=["samba.external"])
 405
 406 version = _glue.version
 407 interface_ips = _glue.interface_ips
 408 set_debug_level = _glue.set_debug_level
 409 unix2nttime = _glue.unix2nttime
 410 generate_random_password = _glue.generate_random_password