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         self.add_ldif(open(ldif_path, 'r').read())
 221
 222     def add_ldif(self, ldif, controls=None):
 223         """Add data based on a LDIF string.
 224
 225         :param ldif: LDIF text.
 226         """
 227         for changetype, msg in self.parse_ldif(ldif):
 228             assert changetype == ldb.CHANGETYPE_NONE
 229             self.add(msg, controls)
 230
 231     def modify_ldif(self, ldif, controls=None):
 232         """Modify database based on a LDIF string.
 233
 234         :param ldif: LDIF text.
 235         """
 236         for changetype, msg in self.parse_ldif(ldif):
 237             if changetype == ldb.CHANGETYPE_ADD:
 238                 self.add(msg, controls)
 239             else:
 240                 self.modify(msg, controls)
 241
 242
 243 def substitute_var(text, values):
 244     """Substitute strings of the form ${NAME} in str, replacing
 245     with substitutions from values.
 246
 247     :param text: Text in which to subsitute.
 248     :param values: Dictionary with keys and values.
 249     """
 250
 251     for (name, value) in values.items():
 252         assert isinstance(name, str), "%r is not a string" % name
 253         assert isinstance(value, str), "Value %r for %s is not a string" % (value, name)
 254         text = text.replace("${%s}" % name, value)
 255
 256     return text
 257
 258
 259 def check_all_substituted(text):
 260     """Check that all substitution variables in a string have been replaced.
 261
 262     If not, raise an exception.
 263
 264     :param text: The text to search for substitution variables
 265     """
 266     if "${" not in text:
 267         return
 268
 269     var_start = text.find("${")
 270     var_end = text.find("}", var_start)
 271
 272     raise Exception("Not all variables substituted: %s" %
 273                     text[var_start:var_end + 1])
 274
 275
 276 def read_and_sub_file(file_name, subst_vars):
 277     """Read a file and sub in variables found in it
 278
 279     :param file_name: File to be read (typically from setup directory)
 280      param subst_vars: Optional variables to subsitute in the file.
 281     """
 282     data = open(file_name, 'r', encoding="utf-8").read()
 283     if subst_vars is not None:
 284         data = substitute_var(data, subst_vars)
 285         check_all_substituted(data)
 286     return data
 287
 288
 289 def setup_file(template, fname, subst_vars=None):
 290     """Setup a file in the private dir.
 291
 292     :param template: Path of the template file.
 293     :param fname: Path of the file to create.
 294     :param subst_vars: Substitution variables.
 295     """
 296     if os.path.exists(fname):
 297         os.unlink(fname)
 298
 299     data = read_and_sub_file(template, subst_vars)
 300     f = open(fname, 'w')
 301     try:
 302         f.write(data)
 303     finally:
 304         f.close()
 305
 306
 307 MAX_NETBIOS_NAME_LEN = 15
 308
 309
 310 def is_valid_netbios_char(c):
 311     return (c.isalnum() or c in " !#$%&'()-.@^_{}~")
 312
 313
 314 def valid_netbios_name(name):
 315     """Check whether a name is valid as a NetBIOS name. """
 316     # See crh's book (1.4.1.1)
 317     if len(name) > MAX_NETBIOS_NAME_LEN:
 318         return False
 319     for x in name:
 320         if not is_valid_netbios_char(x):
 321             return False
 322     return True
 323
 324
 325 def dn_from_dns_name(dnsdomain):
 326     """return a DN from a DNS name domain/forest root"""
 327     return "DC=" + ",DC=".join(dnsdomain.split("."))
 328
 329
 330 def current_unix_time():
 331     return int(time.time())
 332
 333
 334 def string_to_byte_array(string):
 335     blob = [0] * len(string)
 336
 337     for i in range(len(string)):
 338         blob[i] = string[i] if isinstance(string[i], int) else ord(string[i])
 339
 340     return blob
 341
 342
 343 def arcfour_encrypt(key, data):
 344     from samba.crypto import arcfour_crypt_blob
 345     return arcfour_crypt_blob(data, key)
 346
 347
 348 def enable_net_export_keytab():
 349     """This function modifies the samba.net.Net class to contain
 350     an export_keytab() method."""
 351     # This looks very strange because it is.
 352     #
 353     # The dckeytab modules contains nothing, but the act of importing
 354     # it pushes a method into samba.net.Net. It ended up this way
 355     # because Net.export_keytab() only works on Heimdal builds, and
 356     # people sometimes want to compile Samba without Heimdal while
 357     # still having a working samba-tool.
 358     #
 359     # There is probably a better way to do this than a magic module
 360     # import (yes, that's a FIXME if you can be bothered).
 361     from samba import net
 362     from samba import dckeytab
 363
 364
 365 version = _glue.version
 366 interface_ips = _glue.interface_ips
 367 fault_setup = _glue.fault_setup
 368 set_debug_level = _glue.set_debug_level
 369 get_debug_level = _glue.get_debug_level
 370 unix2nttime = _glue.unix2nttime
 371 nttime2string = _glue.nttime2string
 372 nttime2unix = _glue.nttime2unix
 373 unix2nttime = _glue.unix2nttime
 374 generate_random_password = _glue.generate_random_password
 375 generate_random_machine_password = _glue.generate_random_machine_password
 376 check_password_quality = _glue.check_password_quality
 377 generate_random_bytes = _glue.generate_random_bytes
 378 strcasecmp_m = _glue.strcasecmp_m
 379 strstr_m = _glue.strstr_m
 380 is_ntvfs_fileserver_built = _glue.is_ntvfs_fileserver_built
 381 is_heimdal_built = _glue.is_heimdal_built
 382 is_ad_dc_built = _glue.is_ad_dc_built
 383
 384 NTSTATUSError = _glue.NTSTATUSError
 385 HRESULTError = _glue.HRESULTError
 386 WERRORError = _glue.WERRORError
 387 DsExtendedError = _glue.DsExtendedError