python/samba/samba3/__init__.py

   1 # Unix SMB/CIFS implementation.
   2 # Copyright (C) Jelmer Vernooij <jelmer@samba.org> 2007
   3 #
   4 # This program is free software; you can redistribute it and/or modify
   5 # it under the terms of the GNU General Public License as published by
   6 # the Free Software Foundation; either version 3 of the License, or
   7 # (at your option) any later version.
   8 #
   9 # This program is distributed in the hope that it will be useful,
  10 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 # GNU General Public License for more details.
  13 #
  14 # You should have received a copy of the GNU General Public License
  15 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16 #
  17
  18 """Support for reading Samba 3 data files."""
  19
  20 __docformat__ = "restructuredText"
  21
  22 REGISTRY_VALUE_PREFIX = "SAMBA_REGVAL"
  23 REGISTRY_DB_VERSION = 1
  24
  25 import os
  26 import struct
  27 import tdb
  28
  29 import passdb
  30 import param as s3param
  31
  32
  33 def fetch_uint32(tdb, key):
  34     try:
  35         data = tdb[key]
  36     except KeyError:
  37         return None
  38     assert len(data) == 4
  39     return struct.unpack("<L", data)[0]
  40
  41
  42 def fetch_int32(tdb, key):
  43     try:
  44         data = tdb[key]
  45     except KeyError:
  46         return None
  47     assert len(data) == 4
  48     return struct.unpack("<l", data)[0]
  49
  50
  51 class TdbDatabase(object):
  52     """Simple Samba 3 TDB database reader."""
  53     def __init__(self, file):
  54         """Open a file.
  55
  56         :param file: Path of the file to open.
  57         """
  58         self.tdb = tdb.Tdb(file, flags=os.O_RDONLY)
  59         self._check_version()
  60
  61     def _check_version(self):
  62         pass
  63
  64     def close(self):
  65         """Close resources associated with this object."""
  66         self.tdb.close()
  67
  68
  69 class Registry(TdbDatabase):
  70     """Simple read-only support for reading the Samba3 registry.
  71
  72     :note: This object uses the same syntax for registry key paths as
  73         Samba 3. This particular format uses forward slashes for key path
  74         separators and abbreviations for the predefined key names.
  75         e.g.: HKLM/Software/Bar.
  76     """
  77     def __len__(self):
  78         """Return the number of keys."""
  79         return len(self.keys())
  80
  81     def keys(self):
  82         """Return list with all the keys."""
  83         return [k.rstrip("\x00") for k in self.tdb.iterkeys() if not k.startswith(REGISTRY_VALUE_PREFIX)]
  84
  85     def subkeys(self, key):
  86         """Retrieve the subkeys for the specified key.
  87
  88         :param key: Key path.
  89         :return: list with key names
  90         """
  91         data = self.tdb.get("%s\x00" % key)
  92         if data is None:
  93             return []
  94         (num, ) = struct.unpack("<L", data[0:4])
  95         keys = data[4:].split("\0")
  96         assert keys[-1] == ""
  97         keys.pop()
  98         assert len(keys) == num
  99         return keys
 100
 101     def values(self, key):
 102         """Return a dictionary with the values set for a specific key.
 103
 104         :param key: Key to retrieve values for.
 105         :return: Dictionary with value names as key, tuple with type and
 106             data as value."""
 107         data = self.tdb.get("%s/%s\x00" % (REGISTRY_VALUE_PREFIX, key))
 108         if data is None:
 109             return {}
 110         ret = {}
 111         (num, ) = struct.unpack("<L", data[0:4])
 112         data = data[4:]
 113         for i in range(num):
 114             # Value name
 115             (name, data) = data.split("\0", 1)
 116
 117             (type, ) = struct.unpack("<L", data[0:4])
 118             data = data[4:]
 119             (value_len, ) = struct.unpack("<L", data[0:4])
 120             data = data[4:]
 121
 122             ret[name] = (type, data[:value_len])
 123             data = data[value_len:]
 124
 125         return ret
 126
 127
 128 # High water mark keys
 129 IDMAP_HWM_GROUP = "GROUP HWM\0"
 130 IDMAP_HWM_USER = "USER HWM\0"
 131
 132 IDMAP_GROUP_PREFIX = "GID "
 133 IDMAP_USER_PREFIX = "UID "
 134
 135 # idmap version determines auto-conversion
 136 IDMAP_VERSION_V2 = 2
 137
 138 class IdmapDatabase(TdbDatabase):
 139     """Samba 3 ID map database reader."""
 140
 141     def _check_version(self):
 142         assert fetch_int32(self.tdb, "IDMAP_VERSION\0") == IDMAP_VERSION_V2
 143
 144     def ids(self):
 145         """Retrieve a list of all ids in this database."""
 146         for k in self.tdb.iterkeys():
 147             if k.startswith(IDMAP_USER_PREFIX):
 148                 yield k.rstrip("\0").split(" ")
 149             if k.startswith(IDMAP_GROUP_PREFIX):
 150                 yield k.rstrip("\0").split(" ")
 151
 152     def uids(self):
 153         """Retrieve a list of all uids in this database."""
 154         for k in self.tdb.iterkeys():
 155             if k.startswith(IDMAP_USER_PREFIX):
 156                 yield int(k[len(IDMAP_USER_PREFIX):].rstrip("\0"))
 157
 158     def gids(self):
 159         """Retrieve a list of all gids in this database."""
 160         for k in self.tdb.iterkeys():
 161             if k.startswith(IDMAP_GROUP_PREFIX):
 162                 yield int(k[len(IDMAP_GROUP_PREFIX):].rstrip("\0"))
 163
 164     def get_sid(self, xid, id_type):
 165         """Retrive SID associated with a particular id and type.
 166
 167         :param xid: UID or GID to retrive SID for.
 168         :param id_type: Type of id specified - 'UID' or 'GID'
 169         """
 170         data = self.tdb.get("%s %s\0" % (id_type, str(xid)))
 171         if data is None:
 172             return data
 173         return data.rstrip("\0")
 174
 175     def get_user_sid(self, uid):
 176         """Retrieve the SID associated with a particular uid.
 177
 178         :param uid: UID to retrieve SID for.
 179         :return: A SID or None if no mapping was found.
 180         """
 181         data = self.tdb.get("%s%d\0" % (IDMAP_USER_PREFIX, uid))
 182         if data is None:
 183             return data
 184         return data.rstrip("\0")
 185
 186     def get_group_sid(self, gid):
 187         data = self.tdb.get("%s%d\0" % (IDMAP_GROUP_PREFIX, gid))
 188         if data is None:
 189             return data
 190         return data.rstrip("\0")
 191
 192     def get_user_hwm(self):
 193         """Obtain the user high-water mark."""
 194         return fetch_uint32(self.tdb, IDMAP_HWM_USER)
 195
 196     def get_group_hwm(self):
 197         """Obtain the group high-water mark."""
 198         return fetch_uint32(self.tdb, IDMAP_HWM_GROUP)
 199
 200
 201 class SecretsDatabase(TdbDatabase):
 202     """Samba 3 Secrets database reader."""
 203
 204     def get_auth_password(self):
 205         return self.tdb.get("SECRETS/AUTH_PASSWORD")
 206
 207     def get_auth_domain(self):
 208         return self.tdb.get("SECRETS/AUTH_DOMAIN")
 209
 210     def get_auth_user(self):
 211         return self.tdb.get("SECRETS/AUTH_USER")
 212
 213     def get_domain_guid(self, host):
 214         return self.tdb.get("SECRETS/DOMGUID/%s" % host)
 215
 216     def ldap_dns(self):
 217         for k in self.tdb.iterkeys():
 218             if k.startswith("SECRETS/LDAP_BIND_PW/"):
 219                 yield k[len("SECRETS/LDAP_BIND_PW/"):].rstrip("\0")
 220
 221     def domains(self):
 222         """Iterate over domains in this database.
 223
 224         :return: Iterator over the names of domains in this database.
 225         """
 226         for k in self.tdb.iterkeys():
 227             if k.startswith("SECRETS/SID/"):
 228                 yield k[len("SECRETS/SID/"):].rstrip("\0")
 229
 230     def get_ldap_bind_pw(self, host):
 231         return self.tdb.get("SECRETS/LDAP_BIND_PW/%s" % host)
 232
 233     def get_afs_keyfile(self, host):
 234         return self.tdb.get("SECRETS/AFS_KEYFILE/%s" % host)
 235
 236     def get_machine_sec_channel_type(self, host):
 237         return fetch_uint32(self.tdb, "SECRETS/MACHINE_SEC_CHANNEL_TYPE/%s" % host)
 238
 239     def get_machine_last_change_time(self, host):
 240         return fetch_uint32(self.tdb, "SECRETS/MACHINE_LAST_CHANGE_TIME/%s" % host)
 241
 242     def get_machine_password(self, host):
 243         return self.tdb.get("SECRETS/MACHINE_PASSWORD/%s" % host)
 244
 245     def get_machine_acc(self, host):
 246         return self.tdb.get("SECRETS/$MACHINE.ACC/%s" % host)
 247
 248     def get_domtrust_acc(self, host):
 249         return self.tdb.get("SECRETS/$DOMTRUST.ACC/%s" % host)
 250
 251     def trusted_domains(self):
 252         for k in self.tdb.iterkeys():
 253             if k.startswith("SECRETS/$DOMTRUST.ACC/"):
 254                 yield k[len("SECRETS/$DOMTRUST.ACC/"):].rstrip("\0")
 255
 256     def get_random_seed(self):
 257         return self.tdb.get("INFO/random_seed")
 258
 259     def get_sid(self, host):
 260         return self.tdb.get("SECRETS/SID/%s" % host.upper())
 261
 262
 263 SHARE_DATABASE_VERSION_V1 = 1
 264 SHARE_DATABASE_VERSION_V2 = 2
 265
 266
 267 class ShareInfoDatabase(TdbDatabase):
 268     """Samba 3 Share Info database reader."""
 269
 270     def _check_version(self):
 271         assert fetch_int32(self.tdb, "INFO/version\0") in (SHARE_DATABASE_VERSION_V1, SHARE_DATABASE_VERSION_V2)
 272
 273     def get_secdesc(self, name):
 274         """Obtain the security descriptor on a particular share.
 275
 276         :param name: Name of the share
 277         """
 278         secdesc = self.tdb.get("SECDESC/%s" % name)
 279         # FIXME: Run ndr_pull_security_descriptor
 280         return secdesc
 281
 282
 283 class Shares(object):
 284     """Container for share objects."""
 285     def __init__(self, lp, shareinfo):
 286         self.lp = lp
 287         self.shareinfo = shareinfo
 288
 289     def __len__(self):
 290         """Number of shares."""
 291         return len(self.lp) - 1
 292
 293     def __iter__(self):
 294         """Iterate over the share names."""
 295         return self.lp.__iter__()
 296
 297
 298 def shellsplit(text):
 299     """Very simple shell-like line splitting.
 300
 301     :param text: Text to split.
 302     :return: List with parts of the line as strings.
 303     """
 304     ret = list()
 305     inquotes = False
 306     current = ""
 307     for c in text:
 308         if c == "\"":
 309             inquotes = not inquotes
 310         elif c in ("\t", "\n", " ") and not inquotes:
 311             if current != "":
 312                 ret.append(current)
 313             current = ""
 314         else:
 315             current += c
 316     if current != "":
 317         ret.append(current)
 318     return ret
 319
 320
 321 class WinsDatabase(object):
 322     """Samba 3 WINS database reader."""
 323     def __init__(self, file):
 324         self.entries = {}
 325         f = open(file, 'r')
 326         assert f.readline().rstrip("\n") == "VERSION 1 0"
 327         for l in f.readlines():
 328             if l[0] == "#": # skip comments
 329                 continue
 330             entries = shellsplit(l.rstrip("\n"))
 331             name = entries[0]
 332             ttl = int(entries[1])
 333             i = 2
 334             ips = []
 335             while "." in entries[i]:
 336                 ips.append(entries[i])
 337                 i+=1
 338             nb_flags = int(entries[i][:-1], 16)
 339             assert not name in self.entries, "Name %s exists twice" % name
 340             self.entries[name] = (ttl, ips, nb_flags)
 341         f.close()
 342
 343     def __getitem__(self, name):
 344         return self.entries[name]
 345
 346     def __len__(self):
 347         return len(self.entries)
 348
 349     def __iter__(self):
 350         return iter(self.entries)
 351
 352     def items(self):
 353         """Return the entries in this WINS database."""
 354         return self.entries.items()
 355
 356     def close(self): # for consistency
 357         pass
 358
 359
 360 class Samba3(object):
 361     """Samba 3 configuration and state data reader."""
 362
 363     def __init__(self, smbconfpath, s3_lp_ctx=None):
 364         """Open the configuration and data for a Samba 3 installation.
 365
 366         :param smbconfpath: Path to the smb.conf file.
 367         :param s3_lp_ctx: Samba3 Loadparm context
 368         """
 369         self.smbconfpath = smbconfpath
 370         if s3_lp_ctx:
 371             self.lp = s3_lp_ctx
 372         else:
 373             self.lp = s3param.get_context()
 374             self.lp.load(smbconfpath)
 375
 376     def statedir_path(self, path):
 377         if path[0] == "/" or path[0] == ".":
 378             return path
 379         return os.path.join(self.lp.get("state directory"), path)
 380
 381     def privatedir_path(self, path):
 382         if path[0] == "/" or path[0] == ".":
 383             return path
 384         return os.path.join(self.lp.get("private dir"), path)
 385
 386     def get_conf(self):
 387         return self.lp
 388
 389     def get_sam_db(self):
 390         return passdb.PDB(self.lp.get('passdb backend'))
 391
 392     def get_registry(self):
 393         return Registry(self.statedir_path("registry.tdb"))
 394
 395     def get_secrets_db(self):
 396         return SecretsDatabase(self.privatedir_path("secrets.tdb"))
 397
 398     def get_shareinfo_db(self):
 399         return ShareInfoDatabase(self.statedir_path("share_info.tdb"))
 400
 401     def get_idmap_db(self):
 402         return IdmapDatabase(self.statedir_path("winbindd_idmap.tdb"))
 403
 404     def get_wins_db(self):
 405         return WinsDatabase(self.statedir_path("wins.dat"))
 406
 407     def get_shares(self):
 408         return Shares(self.get_conf(), self.get_shareinfo_db())