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Diffstat (limited to '')
-rwxr-xr-x | source4/scripting/bin/samba_downgrade_db | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/source4/scripting/bin/samba_downgrade_db b/source4/scripting/bin/samba_downgrade_db new file mode 100755 index 0000000..b9a0909 --- /dev/null +++ b/source4/scripting/bin/samba_downgrade_db @@ -0,0 +1,135 @@ +#!/usr/bin/python3 +# +# Unix SMB/CIFS implementation. +# Copyright (C) Andrew Bartlett <abartlet@samba.org> 2019 +# +# Downgrade a database from 4.11 format to 4.7 format. 4.7 Format will +# run on any version of Samba AD, and Samba will repack/reconfigure the +# database if necessary. +# +# This program is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 3 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program. If not, see <http://www.gnu.org/licenses/>. +import optparse +import sys + +# Find right directory when running from source tree +sys.path.insert(0, "bin/python") + + +import samba +import ldb +import urllib +import os +from samba import getopt as options +from samba.samdb import SamDB +from samba.dbchecker import dbcheck +from samba.credentials import Credentials +parser = optparse.OptionParser("samba_downgrade_db") +sambaopts = options.SambaOptions(parser) +parser.add_option_group(options.VersionOptions(parser)) +parser.add_option("-H", "--URL", help="LDB URL for database", + type=str, metavar="URL", dest="H") +opts, args = parser.parse_args() + +if len(args) != 0: + parser.print_usage() + sys.exit(1) + +lp_ctx = sambaopts.get_loadparm() + +if opts.H is None: + url = lp_ctx.private_path("sam.ldb") +else: + url = opts.H + +samdb = ldb.Ldb(url=url, + flags=ldb.FLG_DONT_CREATE_DB, + options=["modules:"]) + +partitions = samdb.search(base="@PARTITION", + scope=ldb.SCOPE_BASE, + attrs=["backendStore", "partition"]) + +backend = str(partitions[0].get('backendStore', 'tdb')) + +if backend == "mdb": + samdb = None + options = ["pack_format_override=%d" % ldb.PACKING_FORMAT] + # We can't remove GUID indexes from LMDB in case there are very + # long DNs, so we just move down the pack format, which also removes + # references to ORDERED_INTEGER in @ATTRIBUTES. + + # Reopen the DB with pack_format_override set + samdb = SamDB(url=url, + flags=ldb.FLG_DONT_CREATE_DB, + lp=lp_ctx, + options=options) + samdb.transaction_start() + samdb.transaction_commit() + print("Your database has been downgraded to LDB pack format version %0x (v1)." % ldb.PACKING_FORMAT) + + print("NOTE: Any use of a Samba 4.11 tool that modifies the DB will " + "auto-upgrade back to pack format version %0x (v2)" % + ldb.PACKING_FORMAT_V2) + exit(0); + +# This is needed to force the @ATTRIBUTES and @INDEXLIST to be correct +lp_ctx.set("dsdb:guid index", "false") + +modmsg = ldb.Message() +modmsg.dn = ldb.Dn(samdb, '@INDEXLIST') +modmsg.add(ldb.MessageElement( + elements=[], + flags=ldb.FLAG_MOD_REPLACE, + name='@IDXGUID')) +modmsg.add(ldb.MessageElement( + elements=[], + flags=ldb.FLAG_MOD_REPLACE, + name='@IDX_DN_GUID')) + +samdb.transaction_start() +samdb.modify(modmsg) + +privatedir = os.path.dirname(url) + +dbs = [] +for part in partitions[0]['partition']: + dbname = str(part).split(":")[1] + dbpath = os.path.join(privatedir, dbname) + if os.path.isfile(dbpath): + dbpath = "ldb://" + dbpath + db = ldb.Ldb(url=dbpath, + options=["modules:"], + flags=ldb.FLG_DONT_CREATE_DB) + db.transaction_start() + db.modify(modmsg) + dbs.append(db) + +for db in dbs: + db.transaction_commit() + +samdb.transaction_commit() + +print("Re-opening with the full DB stack") +samdb = SamDB(url=url, + flags=ldb.FLG_DONT_CREATE_DB, + lp=lp_ctx) +print("Re-triggering another re-index") +chk = dbcheck(samdb) + +chk.reindex_database() + +print("Your database has been downgraded to DN-based index values.") + +print("NOTE: Any use of a Samba 4.8 or later tool including ldbsearch will " + "auto-upgrade back to GUID index mode") |