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
  33
  34 def source_tree_topdir():
  35     """Return the top level source directory."""
  36     paths = ["../../..", "../../../.."]
  37     for p in paths:
  38         topdir = os.path.normpath(os.path.join(os.path.dirname(__file__), p))
  39         if os.path.exists(os.path.join(topdir, 'source4')):
  40             return topdir
  41     raise RuntimeError("unable to find top level source directory")
  42
  43
  44 def in_source_tree():
  45     """Return True if we are running from within the samba source tree"""
  46     try:
  47         topdir = source_tree_topdir()
  48     except RuntimeError:
  49         return False
  50     return True
  51
  52
  53 class Ldb(_Ldb):
  54     """Simple Samba-specific LDB subclass that takes care
  55     of setting up the modules dir, credentials pointers, etc.
  56
  57     Please note that this is intended to be for all Samba LDB files,
  58     not necessarily the Sam database. For Sam-specific helper
  59     functions see samdb.py.
  60     """
  61
  62     def __init__(self, url=None, lp=None, modules_dir=None, session_info=None,
  63                  credentials=None, flags=0, options=None):
  64         """Opens a Samba Ldb file.
  65
  66         :param url: Optional LDB URL to open
  67         :param lp: Optional loadparm object
  68         :param modules_dir: Optional modules directory
  69         :param session_info: Optional session information
  70         :param credentials: Optional credentials, defaults to anonymous.
  71         :param flags: Optional LDB flags
  72         :param options: Additional options (optional)
  73
  74         This is different from a regular Ldb file in that the Samba-specific
  75         modules-dir is used by default and that credentials and session_info
  76         can be passed through (required by some modules).
  77         """
  78
  79         if modules_dir is not None:
  80             self.set_modules_dir(modules_dir)
  81         else:
  82             self.set_modules_dir(os.path.join(samba.param.modules_dir(), "ldb"))
  83
  84         if session_info is not None:
  85             self.set_session_info(session_info)
  86
  87         if credentials is not None:
  88             self.set_credentials(credentials)
  89
  90         if lp is not None:
  91             self.set_loadparm(lp)
  92
  93         # This must be done before we load the schema, as these handlers for
  94         # objectSid and objectGUID etc must take precedence over the 'binary
  95         # attribute' declaration in the schema
  96         self.register_samba_handlers()
  97
  98         # TODO set debug
  99         def msg(l, text):
 100             print(text)
 101         # self.set_debug(msg)
 102
 103         self.set_utf8_casefold()
 104
 105         # Allow admins to force non-sync ldb for all databases
 106         if lp is not None:
 107             nosync_p = lp.get("ldb:nosync")
 108             if nosync_p is not None and nosync_p:
 109                 flags |= ldb.FLG_NOSYNC
 110
 111         self.set_create_perms(0o600)
 112
 113         if url is not None:
 114             self.connect(url, flags, options)
 115
 116     def searchone(self, attribute, basedn=None, expression=None,
 117                   scope=ldb.SCOPE_BASE):
 118         """Search for one attribute as a string.
 119
 120         :param basedn: BaseDN for the search.
 121         :param attribute: Name of the attribute
 122         :param expression: Optional search expression.
 123         :param scope: Search scope (defaults to base).
 124         :return: Value of attribute as a string or None if it wasn't found.
 125         """
 126         res = self.search(basedn, scope, expression, [attribute])
 127         if len(res) != 1 or res[0][attribute] is None:
 128             return None
 129         values = set(res[0][attribute])
 130         assert len(values) == 1
 131         return self.schema_format_value(attribute, values.pop())
 132
 133     def erase_users_computers(self, dn):
 134         """Erases user and computer objects from our AD.
 135
 136         This is needed since the 'samldb' module denies the deletion of primary
 137         groups. Therefore all groups shouldn't be primary somewhere anymore.
 138         """
 139
 140         try:
 141             res = self.search(base=dn, scope=ldb.SCOPE_SUBTREE, attrs=[],
 142                               expression="(|(objectclass=user)(objectclass=computer))")
 143         except ldb.LdbError as error:
 144             (errno, estr) = error.args
 145             if errno == ldb.ERR_NO_SUCH_OBJECT:
 146                 # Ignore no such object errors
 147                 return
 148             else:
 149                 raise
 150
 151         try:
 152             for msg in res:
 153                 self.delete(msg.dn, ["relax:0"])
 154         except ldb.LdbError as error:
 155             (errno, estr) = error.args
 156             if errno != ldb.ERR_NO_SUCH_OBJECT:
 157                 # Ignore no such object errors
 158                 raise
 159
 160     def erase_except_schema_controlled(self):
 161         """Erase this ldb.
 162
 163         :note: Removes all records, except those that are controlled by
 164             Samba4's schema.
 165         """
 166
 167         basedn = ""
 168
 169         # Try to delete user/computer accounts to allow deletion of groups
 170         self.erase_users_computers(basedn)
 171
 172         # Delete the 'visible' records, and the invisble 'deleted' records (if
 173         # this DB supports it)
 174         for msg in self.search(basedn, ldb.SCOPE_SUBTREE,
 175                                "(&(|(objectclass=*)(distinguishedName=*))(!(distinguishedName=@BASEINFO)))",
 176                                [], controls=["show_deleted:0", "show_recycled:0"]):
 177             try:
 178                 self.delete(msg.dn, ["relax:0"])
 179             except ldb.LdbError as error:
 180                 (errno, estr) = error.args
 181                 if errno != ldb.ERR_NO_SUCH_OBJECT:
 182                     # Ignore no such object errors
 183                     raise
 184
 185         res = self.search(basedn, ldb.SCOPE_SUBTREE,
 186                           "(&(|(objectclass=*)(distinguishedName=*))(!(distinguishedName=@BASEINFO)))",
 187                           [], controls=["show_deleted:0", "show_recycled:0"])
 188         assert len(res) == 0
 189
 190         # delete the specials
 191         for attr in ["@SUBCLASSES", "@MODULES",
 192                      "@OPTIONS", "@PARTITION", "@KLUDGEACL"]:
 193             try:
 194                 self.delete(attr, ["relax:0"])
 195             except ldb.LdbError as error:
 196                 (errno, estr) = error.args
 197                 if errno != ldb.ERR_NO_SUCH_OBJECT:
 198                     # Ignore missing dn errors
 199                     raise
 200
 201     def erase(self):
 202         """Erase this ldb, removing all records."""
 203         self.erase_except_schema_controlled()
 204
 205         # delete the specials
 206         for attr in ["@INDEXLIST", "@ATTRIBUTES"]:
 207             try:
 208                 self.delete(attr, ["relax:0"])
 209             except ldb.LdbError as error:
 210                 (errno, estr) = error.args
 211                 if errno != ldb.ERR_NO_SUCH_OBJECT:
 212                     # Ignore missing dn errors
 213                     raise
 214
 215     def load_ldif_file_add(self, ldif_path):
 216         """Load a LDIF file.
 217
 218         :param ldif_path: Path to LDIF file.
 219         """
 220         with open(ldif_path, 'r') as ldif_file:
 221             self.add_ldif(ldif_file.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 ${NAME} in str, replacing
 246     with substitutions from values.
 247
 248     :param text: Text in which to subsitute.
 249     :param values: Dictionary with keys and values.
 250     """
 251
 252     for (name, value) in values.items():
 253         assert isinstance(name, str), "%r is not a string" % name
 254         assert isinstance(value, str), "Value %r for %s is not a string" % (value, name)
 255         text = text.replace("${%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     with open(file_name, 'r', encoding="utf-8") as data_file:
 284         data = data_file.read()
 285         if subst_vars is not None:
 286             data = substitute_var(data, subst_vars)
 287             check_all_substituted(data)
 288     return data
 289
 290
 291 def setup_file(template, fname, subst_vars=None):
 292     """Setup a file in the private dir.
 293
 294     :param template: Path of the template file.
 295     :param fname: Path of the file to create.
 296     :param subst_vars: Substitution variables.
 297     """
 298     if os.path.exists(fname):
 299         os.unlink(fname)
 300
 301     data = read_and_sub_file(template, subst_vars)
 302     f = open(fname, 'w')
 303     try:
 304         f.write(data)
 305     finally:
 306         f.close()
 307
 308
 309 MAX_NETBIOS_NAME_LEN = 15
 310
 311
 312 def is_valid_netbios_char(c):
 313     return (c.isalnum() or c in " !#$%&'()-.@^_{}~")
 314
 315
 316 def valid_netbios_name(name):
 317     """Check whether a name is valid as a NetBIOS name. """
 318     # See crh's book (1.4.1.1)
 319     if len(name) > MAX_NETBIOS_NAME_LEN:
 320         return False
 321     for x in name:
 322         if not is_valid_netbios_char(x):
 323             return False
 324     return True
 325
 326
 327 def dn_from_dns_name(dnsdomain):
 328     """return a DN from a DNS name domain/forest root"""
 329     return "DC=" + ",DC=".join(dnsdomain.split("."))
 330
 331
 332 def current_unix_time():
 333     return int(time.time())
 334
 335
 336 def string_to_byte_array(string):
 337     blob = [0] * len(string)
 338
 339     for i in range(len(string)):
 340         blob[i] = string[i] if isinstance(string[i], int) else ord(string[i])
 341
 342     return blob
 343
 344
 345 def arcfour_encrypt(key, data):
 346     from samba.crypto import arcfour_crypt_blob
 347     return arcfour_crypt_blob(data, key)
 348
 349
 350 def enable_net_export_keytab():
 351     """This function modifies the samba.net.Net class to contain
 352     an export_keytab() method."""
 353     # This looks very strange because it is.
 354     #
 355     # The dckeytab modules contains nothing, but the act of importing
 356     # it pushes a method into samba.net.Net. It ended up this way
 357     # because Net.export_keytab() only works on Heimdal builds, and
 358     # people sometimes want to compile Samba without Heimdal while
 359     # still having a working samba-tool.
 360     #
 361     # There is probably a better way to do this than a magic module
 362     # import (yes, that's a FIXME if you can be bothered).
 363     from samba import net
 364     from samba import dckeytab
 365
 366
 367 version = _glue.version
 368 interface_ips = _glue.interface_ips
 369 fault_setup = _glue.fault_setup
 370 set_debug_level = _glue.set_debug_level
 371 get_debug_level = _glue.get_debug_level
 372 unix2nttime = _glue.unix2nttime
 373 float2nttime = _glue.float2nttime
 374 nttime2float = _glue.nttime2float
 375 nttime2string = _glue.nttime2string
 376 nttime2unix = _glue.nttime2unix
 377 unix2nttime = _glue.unix2nttime
 378 generate_random_password = _glue.generate_random_password
 379 generate_random_machine_password = _glue.generate_random_machine_password
 380 check_password_quality = _glue.check_password_quality
 381 generate_random_bytes = _glue.generate_random_bytes
 382 strcasecmp_m = _glue.strcasecmp_m
 383 strstr_m = _glue.strstr_m
 384 is_ntvfs_fileserver_built = _glue.is_ntvfs_fileserver_built
 385 is_heimdal_built = _glue.is_heimdal_built
 386 is_ad_dc_built = _glue.is_ad_dc_built
 387 is_selftest_enabled = _glue.is_selftest_enabled
 388
 389 NTSTATUSError = _glue.NTSTATUSError
 390 HRESULTError = _glue.HRESULTError
 391 WERRORError = _glue.WERRORError
 392 DsExtendedError = _glue.DsExtendedError