python/samba/__init__.py

   1 # Unix SMB/CIFS implementation.
   2 # Copyright (C) Jelmer Vernooij <jelmer@samba.org> 2007-2008
   3 #
   4 # Based on the original in EJS:
   5 # Copyright (C) Andrew Tridgell <tridge@samba.org> 2005
   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 """Samba 4."""
  22
  23 __docformat__ = "restructuredText"
  24
  25 import os
  26 import sys
  27 import time
  28 import ldb
  29 import samba.param
  30 from samba import _glue
  31 from samba._ldb import Ldb as _Ldb
  32 from samba.compat import string_types
  33
  34
  35 def source_tree_topdir():
  36     """Return the top level source directory."""
  37     paths = ["../../..", "../../../.."]
  38     for p in paths:
  39         topdir = os.path.normpath(os.path.join(os.path.dirname(__file__), p))
  40         if os.path.exists(os.path.join(topdir, 'source4')):
  41             return topdir
  42     raise RuntimeError("unable to find top level source directory")
  43
  44
  45 def in_source_tree():
  46     """Return True if we are running from within the samba source tree"""
  47     try:
  48         topdir = source_tree_topdir()
  49     except RuntimeError:
  50         return False
  51     return True
  52
  53
  54 class Ldb(_Ldb):
  55     """Simple Samba-specific LDB subclass that takes care
  56     of setting up the modules dir, credentials pointers, etc.
  57
  58     Please note that this is intended to be for all Samba LDB files,
  59     not necessarily the Sam database. For Sam-specific helper
  60     functions see samdb.py.
  61     """
  62
  63     def __init__(self, url=None, lp=None, modules_dir=None, session_info=None,
  64                  credentials=None, flags=0, options=None):
  65         """Opens a Samba Ldb file.
  66
  67         :param url: Optional LDB URL to open
  68         :param lp: Optional loadparm object
  69         :param modules_dir: Optional modules directory
  70         :param session_info: Optional session information
  71         :param credentials: Optional credentials, defaults to anonymous.
  72         :param flags: Optional LDB flags
  73         :param options: Additional options (optional)
  74
  75         This is different from a regular Ldb file in that the Samba-specific
  76         modules-dir is used by default and that credentials and session_info
  77         can be passed through (required by some modules).
  78         """
  79
  80         if modules_dir is not None:
  81             self.set_modules_dir(modules_dir)
  82         else:
  83             self.set_modules_dir(os.path.join(samba.param.modules_dir(), "ldb"))
  84
  85         if session_info is not None:
  86             self.set_session_info(session_info)
  87
  88         if credentials is not None:
  89             self.set_credentials(credentials)
  90
  91         if lp is not None:
  92             self.set_loadparm(lp)
  93
  94         # This must be done before we load the schema, as these handlers for
  95         # objectSid and objectGUID etc must take precedence over the 'binary
  96         # attribute' declaration in the schema
  97         self.register_samba_handlers()
  98
  99         # TODO set debug
 100         def msg(l, text):
 101             print(text)
 102         # self.set_debug(msg)
 103
 104         self.set_utf8_casefold()
 105
 106         # Allow admins to force non-sync ldb for all databases
 107         if lp is not None:
 108             nosync_p = lp.get("ldb:nosync")
 109             if nosync_p is not None and nosync_p:
 110                 flags |= ldb.FLG_NOSYNC
 111
 112         self.set_create_perms(0o600)
 113
 114         if url is not None:
 115             self.connect(url, flags, options)
 116
 117     def searchone(self, attribute, basedn=None, expression=None,
 118                   scope=ldb.SCOPE_BASE):
 119         """Search for one attribute as a string.
 120
 121         :param basedn: BaseDN for the search.
 122         :param attribute: Name of the attribute
 123         :param expression: Optional search expression.
 124         :param scope: Search scope (defaults to base).
 125         :return: Value of attribute as a string or None if it wasn't found.
 126         """
 127         res = self.search(basedn, scope, expression, [attribute])
 128         if len(res) != 1 or res[0][attribute] is None:
 129             return None
 130         values = set(res[0][attribute])
 131         assert len(values) == 1
 132         return self.schema_format_value(attribute, values.pop())
 133
 134     def erase_users_computers(self, dn):
 135         """Erases user and computer objects from our AD.
 136
 137         This is needed since the 'samldb' module denies the deletion of primary
 138         groups. Therefore all groups shouldn't be primary somewhere anymore.
 139         """
 140
 141         try:
 142             res = self.search(base=dn, scope=ldb.SCOPE_SUBTREE, attrs=[],
 143                               expression="(|(objectclass=user)(objectclass=computer))")
 144         except ldb.LdbError as error:
 145             (errno, estr) = error.args
 146             if errno == ldb.ERR_NO_SUCH_OBJECT:
 147                 # Ignore no such object errors
 148                 return
 149             else:
 150                 raise
 151
 152         try:
 153             for msg in res:
 154                 self.delete(msg.dn, ["relax:0"])
 155         except ldb.LdbError as error:
 156             (errno, estr) = error.args
 157             if errno != ldb.ERR_NO_SUCH_OBJECT:
 158                 # Ignore no such object errors
 159                 raise
 160
 161     def erase_except_schema_controlled(self):
 162         """Erase this ldb.
 163
 164         :note: Removes all records, except those that are controlled by
 165             Samba4's schema.
 166         """
 167
 168         basedn = ""
 169
 170         # Try to delete user/computer accounts to allow deletion of groups
 171         self.erase_users_computers(basedn)
 172
 173         # Delete the 'visible' records, and the invisble 'deleted' records (if
 174         # this DB supports it)
 175         for msg in self.search(basedn, ldb.SCOPE_SUBTREE,
 176                                "(&(|(objectclass=*)(distinguishedName=*))(!(distinguishedName=@BASEINFO)))",
 177                                [], controls=["show_deleted:0", "show_recycled:0"]):
 178             try:
 179                 self.delete(msg.dn, ["relax:0"])
 180             except ldb.LdbError as error:
 181                 (errno, estr) = error.args
 182                 if errno != ldb.ERR_NO_SUCH_OBJECT:
 183                     # Ignore no such object errors
 184                     raise
 185
 186         res = self.search(basedn, ldb.SCOPE_SUBTREE,
 187                           "(&(|(objectclass=*)(distinguishedName=*))(!(distinguishedName=@BASEINFO)))",
 188                           [], controls=["show_deleted:0", "show_recycled:0"])
 189         assert len(res) == 0
 190
 191         # delete the specials
 192         for attr in ["@SUBCLASSES", "@MODULES",
 193                      "@OPTIONS", "@PARTITION", "@KLUDGEACL"]:
 194             try:
 195                 self.delete(attr, ["relax:0"])
 196             except ldb.LdbError as error:
 197                 (errno, estr) = error.args
 198                 if errno != ldb.ERR_NO_SUCH_OBJECT:
 199                     # Ignore missing dn errors
 200                     raise
 201
 202     def erase(self):
 203         """Erase this ldb, removing all records."""
 204         self.erase_except_schema_controlled()
 205
 206         # delete the specials
 207         for attr in ["@INDEXLIST", "@ATTRIBUTES"]:
 208             try:
 209                 self.delete(attr, ["relax:0"])
 210             except ldb.LdbError as error:
 211                 (errno, estr) = error.args
 212                 if errno != ldb.ERR_NO_SUCH_OBJECT:
 213                     # Ignore missing dn errors
 214                     raise
 215
 216     def load_ldif_file_add(self, ldif_path):
 217         """Load a LDIF file.
 218
 219         :param ldif_path: Path to LDIF file.
 220         """
 221         self.add_ldif(open(ldif_path, 'r').read())
 222
 223     def add_ldif(self, ldif, controls=None):
 224         """Add data based on a LDIF string.
 225
 226         :param ldif: LDIF text.
 227         """
 228         for changetype, msg in self.parse_ldif(ldif):
 229             assert changetype == ldb.CHANGETYPE_NONE
 230             self.add(msg, controls)
 231
 232     def modify_ldif(self, ldif, controls=None):
 233         """Modify database based on a LDIF string.
 234
 235         :param ldif: LDIF text.
 236         """
 237         for changetype, msg in self.parse_ldif(ldif):
 238             if changetype == ldb.CHANGETYPE_ADD:
 239                 self.add(msg, controls)
 240             else:
 241                 self.modify(msg, controls)
 242
 243
 244 def substitute_var(text, values):
 245     """Substitute strings of the form ${NAME} in str, replacing
 246     with substitutions from values.
 247
 248     :param text: Text in which to subsitute.
 249     :param values: Dictionary with keys and values.
 250     """
 251
 252     for (name, value) in values.items():
 253         assert isinstance(name, string_types), "%r is not a string" % name
 254         assert isinstance(value, string_types), "Value %r for %s is not a string" % (value, name)
 255         text = text.replace("${%s}" % name, value)
 256
 257     return text
 258
 259
 260 def check_all_substituted(text):
 261     """Check that all substitution variables in a string have been replaced.
 262
 263     If not, raise an exception.
 264
 265     :param text: The text to search for substitution variables
 266     """
 267     if "${" not in text:
 268         return
 269
 270     var_start = text.find("${")
 271     var_end = text.find("}", var_start)
 272
 273     raise Exception("Not all variables substituted: %s" %
 274                     text[var_start:var_end + 1])
 275
 276
 277 def read_and_sub_file(file_name, subst_vars):
 278     """Read a file and sub in variables found in it
 279
 280     :param file_name: File to be read (typically from setup directory)
 281      param subst_vars: Optional variables to subsitute in the file.
 282     """
 283     data = open(file_name, 'r', encoding="utf-8").read()
 284     if subst_vars is not None:
 285         data = substitute_var(data, subst_vars)
 286         check_all_substituted(data)
 287     return data
 288
 289
 290 def setup_file(template, fname, subst_vars=None):
 291     """Setup a file in the private dir.
 292
 293     :param template: Path of the template file.
 294     :param fname: Path of the file to create.
 295     :param subst_vars: Substitution variables.
 296     """
 297     if os.path.exists(fname):
 298         os.unlink(fname)
 299
 300     data = read_and_sub_file(template, subst_vars)
 301     f = open(fname, 'w')
 302     try:
 303         f.write(data)
 304     finally:
 305         f.close()
 306
 307
 308 MAX_NETBIOS_NAME_LEN = 15
 309
 310
 311 def is_valid_netbios_char(c):
 312     return (c.isalnum() or c in " !#$%&'()-.@^_{}~")
 313
 314
 315 def valid_netbios_name(name):
 316     """Check whether a name is valid as a NetBIOS name. """
 317     # See crh's book (1.4.1.1)
 318     if len(name) > MAX_NETBIOS_NAME_LEN:
 319         return False
 320     for x in name:
 321         if not is_valid_netbios_char(x):
 322             return False
 323     return True
 324
 325
 326 def import_bundled_package(modulename, location, source_tree_container,
 327                            namespace):
 328     """Import the bundled version of a package.
 329
 330     :note: This should only be called if the system version of the package
 331         is not adequate.
 332
 333     :param modulename: Module name to import
 334     :param location: Location to add to sys.path (can be relative to
 335         ${srcdir}/${source_tree_container})
 336     :param source_tree_container: Directory under source root that
 337         contains the bundled third party modules.
 338     :param namespace: Namespace to import module from, when not in source tree
 339     """
 340     if in_source_tree():
 341         extra_path = os.path.join(source_tree_topdir(), source_tree_container,
 342                                   location)
 343         if extra_path not in sys.path:
 344             sys.path.insert(0, extra_path)
 345         sys.modules[modulename] = __import__(modulename)
 346     else:
 347         sys.modules[modulename] = __import__(
 348             "%s.%s" % (namespace, modulename), fromlist=[namespace])
 349
 350
 351 def ensure_third_party_module(modulename, location):
 352     """Add a location to sys.path if a third party dependency can't be found.
 353
 354     :param modulename: Module name to import
 355     :param location: Location to add to sys.path (can be relative to
 356         ${srcdir}/third_party)
 357     """
 358     try:
 359         __import__(modulename)
 360     except ImportError:
 361         import_bundled_package(modulename, location,
 362                                source_tree_container="third_party",
 363                                namespace="samba.third_party")
 364
 365
 366 def dn_from_dns_name(dnsdomain):
 367     """return a DN from a DNS name domain/forest root"""
 368     return "DC=" + ",DC=".join(dnsdomain.split("."))
 369
 370
 371 def current_unix_time():
 372     return int(time.time())
 373
 374
 375 def string_to_byte_array(string):
 376     blob = [0] * len(string)
 377
 378     for i in range(len(string)):
 379         blob[i] = string[i] if isinstance(string[i], int) else ord(string[i])
 380
 381     return blob
 382
 383
 384 def arcfour_encrypt(key, data):
 385     from samba.crypto import arcfour_crypt_blob
 386     return arcfour_crypt_blob(data, key)
 387
 388
 389 version = _glue.version
 390 interface_ips = _glue.interface_ips
 391 fault_setup = _glue.fault_setup
 392 set_debug_level = _glue.set_debug_level
 393 get_debug_level = _glue.get_debug_level
 394 unix2nttime = _glue.unix2nttime
 395 nttime2string = _glue.nttime2string
 396 nttime2unix = _glue.nttime2unix
 397 unix2nttime = _glue.unix2nttime
 398 generate_random_password = _glue.generate_random_password
 399 generate_random_machine_password = _glue.generate_random_machine_password
 400 check_password_quality = _glue.check_password_quality
 401 generate_random_bytes = _glue.generate_random_bytes
 402 strcasecmp_m = _glue.strcasecmp_m
 403 strstr_m = _glue.strstr_m
 404 is_ntvfs_fileserver_built = _glue.is_ntvfs_fileserver_built
 405 is_heimdal_built = _glue.is_heimdal_built
 406
 407 NTSTATUSError = _glue.NTSTATUSError
 408 HRESULTError = _glue.HRESULTError
 409 WERRORError = _glue.WERRORError
 410 DsExtendedError = _glue.DsExtendedError