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6e5ebbfb65
We are starting to hit restore cases that are only applicable to a particular type of backup. We already had a marker to differentiate renames, but differentiating offline backups would also be useful. Note that this raises a slight compatibility issue for backups created on v4.9, as the marker won't exist. However, it's only offline backups we will use this marker for (at the moment), and this option doesn't exist on v4.9, so there's no problem. Removing the markers has been refactored out into a separate function to handle the optional presence of the new marker. Signed-off-by: Tim Beale <timbeale@catalyst.net.nz> Reviewed-by: Andrew Bartlett <abartlet@samba.org>
1072 lines
46 KiB
Python
1072 lines
46 KiB
Python
# domain_backup
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#
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# Copyright Andrew Bartlett <abartlet@samba.org>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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import datetime
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import os
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import sys
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import tarfile
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import logging
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import shutil
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import tempfile
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import samba
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import tdb
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import samba.getopt as options
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from samba.samdb import SamDB, get_default_backend_store
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import ldb
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from samba import smb
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from samba.ntacls import backup_online, backup_restore, backup_offline
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from samba.auth import system_session
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from samba.join import DCJoinContext, join_clone, DCCloneAndRenameContext
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from samba.dcerpc.security import dom_sid
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from samba.netcmd import Option, CommandError
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from samba.dcerpc import misc, security
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from samba import Ldb
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from . fsmo import cmd_fsmo_seize
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from samba.provision import make_smbconf, DEFAULTSITE
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from samba.upgradehelpers import update_krbtgt_account_password
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from samba.remove_dc import remove_dc
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from samba.provision import secretsdb_self_join
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from samba.dbchecker import dbcheck
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import re
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from samba.provision import guess_names, determine_host_ip, determine_host_ip6
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from samba.provision.sambadns import (fill_dns_data_partitions,
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get_dnsadmins_sid,
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get_domainguid)
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from samba.tdb_util import tdb_copy
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from samba.mdb_util import mdb_copy
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import errno
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from subprocess import CalledProcessError
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from samba import sites
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# work out a SID (based on a free RID) to use when the domain gets restored.
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# This ensures that the restored DC's SID won't clash with any other RIDs
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# already in use in the domain
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def get_sid_for_restore(samdb):
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# Find the DN of the RID set of the server
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res = samdb.search(base=ldb.Dn(samdb, samdb.get_serverName()),
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scope=ldb.SCOPE_BASE, attrs=["serverReference"])
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server_ref_dn = ldb.Dn(samdb, str(res[0]['serverReference'][0]))
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res = samdb.search(base=server_ref_dn,
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scope=ldb.SCOPE_BASE,
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attrs=['rIDSetReferences'])
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rid_set_dn = ldb.Dn(samdb, str(res[0]['rIDSetReferences'][0]))
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# Get the alloc pools and next RID of the RID set
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res = samdb.search(base=rid_set_dn,
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scope=ldb.SCOPE_SUBTREE,
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expression="(rIDNextRID=*)",
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attrs=['rIDAllocationPool',
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'rIDPreviousAllocationPool',
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'rIDNextRID'])
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# Decode the bounds of the RID allocation pools
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rid = int(res[0].get('rIDNextRID')[0])
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def split_val(num):
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high = (0xFFFFFFFF00000000 & int(num)) >> 32
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low = 0x00000000FFFFFFFF & int(num)
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return low, high
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pool_l, pool_h = split_val(res[0].get('rIDPreviousAllocationPool')[0])
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npool_l, npool_h = split_val(res[0].get('rIDAllocationPool')[0])
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# Calculate next RID based on pool bounds
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if rid == npool_h:
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raise CommandError('Out of RIDs, finished AllocPool')
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if rid == pool_h:
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if pool_h == npool_h:
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raise CommandError('Out of RIDs, finished PrevAllocPool.')
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rid = npool_l
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else:
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rid += 1
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# Construct full SID
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sid = dom_sid(samdb.get_domain_sid())
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return str(sid) + '-' + str(rid)
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def get_timestamp():
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return datetime.datetime.now().isoformat().replace(':', '-')
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def backup_filepath(targetdir, name, time_str):
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filename = 'samba-backup-%s-%s.tar.bz2' % (name, time_str)
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return os.path.join(targetdir, filename)
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def create_backup_tar(logger, tmpdir, backup_filepath):
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# Adds everything in the tmpdir into a new tar file
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logger.info("Creating backup file %s..." % backup_filepath)
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tf = tarfile.open(backup_filepath, 'w:bz2')
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tf.add(tmpdir, arcname='./')
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tf.close()
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def create_log_file(targetdir, lp, backup_type, server, include_secrets,
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extra_info=None):
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# create a summary file about the backup, which will get included in the
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# tar file. This makes it easy for users to see what the backup involved,
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# without having to untar the DB and interrogate it
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f = open(os.path.join(targetdir, "backup.txt"), 'w')
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try:
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time_str = datetime.datetime.now().strftime('%Y-%b-%d %H:%M:%S')
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f.write("Backup created %s\n" % time_str)
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f.write("Using samba-tool version: %s\n" % lp.get('server string'))
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f.write("Domain %s backup, using DC '%s'\n" % (backup_type, server))
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f.write("Backup for domain %s (NetBIOS), %s (DNS realm)\n" %
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(lp.get('workgroup'), lp.get('realm').lower()))
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f.write("Backup contains domain secrets: %s\n" % str(include_secrets))
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if extra_info:
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f.write("%s\n" % extra_info)
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finally:
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f.close()
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# Add a backup-specific marker to the DB with info that we'll use during
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# the restore process
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def add_backup_marker(samdb, marker, value):
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m = ldb.Message()
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m.dn = ldb.Dn(samdb, "@SAMBA_DSDB")
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m[marker] = ldb.MessageElement(value, ldb.FLAG_MOD_ADD, marker)
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samdb.modify(m)
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def check_targetdir(logger, targetdir):
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if targetdir is None:
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raise CommandError('Target directory required')
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if not os.path.exists(targetdir):
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logger.info('Creating targetdir %s...' % targetdir)
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os.makedirs(targetdir)
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elif not os.path.isdir(targetdir):
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raise CommandError("%s is not a directory" % targetdir)
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# For '--no-secrets' backups, this sets the Administrator user's password to a
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# randomly-generated value. This is similar to the provision behaviour
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def set_admin_password(logger, samdb):
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"""Sets a randomly generated password for the backup DB's admin user"""
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# match the admin user by RID
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domainsid = samdb.get_domain_sid()
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match_admin = "(objectsid=%s-%s)" % (domainsid,
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security.DOMAIN_RID_ADMINISTRATOR)
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search_expr = "(&(objectClass=user)%s)" % (match_admin,)
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# retrieve the admin username (just in case it's been renamed)
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res = samdb.search(base=samdb.domain_dn(), scope=ldb.SCOPE_SUBTREE,
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expression=search_expr)
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username = str(res[0]['samaccountname'])
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adminpass = samba.generate_random_password(12, 32)
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logger.info("Setting %s password in backup to: %s" % (username, adminpass))
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logger.info("Run 'samba-tool user setpassword %s' after restoring DB" %
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username)
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samdb.setpassword(search_expr, adminpass, force_change_at_next_login=False,
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username=username)
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class cmd_domain_backup_online(samba.netcmd.Command):
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'''Copy a running DC's current DB into a backup tar file.
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Takes a backup copy of the current domain from a running DC. If the domain
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were to undergo a catastrophic failure, then the backup file can be used to
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recover the domain. The backup created is similar to the DB that a new DC
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would receive when it joins the domain.
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Note that:
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- it's recommended to run 'samba-tool dbcheck' before taking a backup-file
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and fix any errors it reports.
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- all the domain's secrets are included in the backup file.
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- although the DB contents can be untarred and examined manually, you need
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to run 'samba-tool domain backup restore' before you can start a Samba DC
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from the backup file.'''
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synopsis = "%prog --server=<DC-to-backup> --targetdir=<output-dir>"
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takes_optiongroups = {
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"sambaopts": options.SambaOptions,
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"credopts": options.CredentialsOptions,
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}
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takes_options = [
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Option("--server", help="The DC to backup", type=str),
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Option("--targetdir", type=str,
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help="Directory to write the backup file to"),
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Option("--no-secrets", action="store_true", default=False,
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help="Exclude secret values from the backup created"),
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Option("--backend-store", type="choice", metavar="BACKENDSTORE",
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choices=["tdb", "mdb"],
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help="Specify the database backend to be used "
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"(default is %s)" % get_default_backend_store()),
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]
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def run(self, sambaopts=None, credopts=None, server=None, targetdir=None,
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no_secrets=False, backend_store=None):
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logger = self.get_logger()
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logger.setLevel(logging.DEBUG)
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lp = sambaopts.get_loadparm()
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creds = credopts.get_credentials(lp)
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# Make sure we have all the required args.
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if server is None:
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raise CommandError('Server required')
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check_targetdir(logger, targetdir)
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tmpdir = tempfile.mkdtemp(dir=targetdir)
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# Run a clone join on the remote
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include_secrets = not no_secrets
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ctx = join_clone(logger=logger, creds=creds, lp=lp,
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include_secrets=include_secrets, server=server,
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dns_backend='SAMBA_INTERNAL', targetdir=tmpdir,
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backend_store=backend_store)
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# get the paths used for the clone, then drop the old samdb connection
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paths = ctx.paths
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del ctx
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# Get a free RID to use as the new DC's SID (when it gets restored)
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remote_sam = SamDB(url='ldap://' + server, credentials=creds,
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session_info=system_session(), lp=lp)
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new_sid = get_sid_for_restore(remote_sam)
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realm = remote_sam.domain_dns_name()
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# Grab the remote DC's sysvol files and bundle them into a tar file
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sysvol_tar = os.path.join(tmpdir, 'sysvol.tar.gz')
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smb_conn = smb.SMB(server, "sysvol", lp=lp, creds=creds, sign=True)
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backup_online(smb_conn, sysvol_tar, remote_sam.get_domain_sid())
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# remove the default sysvol files created by the clone (we want to
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# make sure we restore the sysvol.tar.gz files instead)
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shutil.rmtree(paths.sysvol)
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# Edit the downloaded sam.ldb to mark it as a backup
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samdb = SamDB(url=paths.samdb, session_info=system_session(), lp=lp)
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time_str = get_timestamp()
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add_backup_marker(samdb, "backupDate", time_str)
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add_backup_marker(samdb, "sidForRestore", new_sid)
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add_backup_marker(samdb, "backupType", "online")
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# ensure the admin user always has a password set (same as provision)
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if no_secrets:
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set_admin_password(logger, samdb)
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# Add everything in the tmpdir to the backup tar file
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backup_file = backup_filepath(targetdir, realm, time_str)
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create_log_file(tmpdir, lp, "online", server, include_secrets)
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create_backup_tar(logger, tmpdir, backup_file)
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shutil.rmtree(tmpdir)
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class cmd_domain_backup_restore(cmd_fsmo_seize):
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'''Restore the domain's DB from a backup-file.
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This restores a previously backed up copy of the domain's DB on a new DC.
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Note that the restored DB will not contain the original DC that the backup
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was taken from (or any other DCs in the original domain). Only the new DC
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(specified by --newservername) will be present in the restored DB.
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Samba can then be started against the restored DB. Any existing DCs for the
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domain should be shutdown before the new DC is started. Other DCs can then
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be joined to the new DC to recover the network.
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Note that this command should be run as the root user - it will fail
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otherwise.'''
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synopsis = ("%prog --backup-file=<tar-file> --targetdir=<output-dir> "
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"--newservername=<DC-name>")
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takes_options = [
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Option("--backup-file", help="Path to backup file", type=str),
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Option("--targetdir", help="Path to write to", type=str),
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Option("--newservername", help="Name for new server", type=str),
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Option("--host-ip", type="string", metavar="IPADDRESS",
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help="set IPv4 ipaddress"),
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Option("--host-ip6", type="string", metavar="IP6ADDRESS",
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help="set IPv6 ipaddress"),
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Option("--site", help="Site to add the new server in", type=str),
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]
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takes_optiongroups = {
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"sambaopts": options.SambaOptions,
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"credopts": options.CredentialsOptions,
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}
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def register_dns_zone(self, logger, samdb, lp, ntdsguid, host_ip,
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host_ip6, site):
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'''
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Registers the new realm's DNS objects when a renamed domain backup
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is restored.
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'''
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names = guess_names(lp)
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domaindn = names.domaindn
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forestdn = samdb.get_root_basedn().get_linearized()
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dnsdomain = names.dnsdomain.lower()
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dnsforest = dnsdomain
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hostname = names.netbiosname.lower()
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domainsid = dom_sid(samdb.get_domain_sid())
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dnsadmins_sid = get_dnsadmins_sid(samdb, domaindn)
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domainguid = get_domainguid(samdb, domaindn)
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# work out the IP address to use for the new DC's DNS records
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host_ip = determine_host_ip(logger, lp, host_ip)
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host_ip6 = determine_host_ip6(logger, lp, host_ip6)
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if host_ip is None and host_ip6 is None:
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raise CommandError('Please specify a host-ip for the new server')
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logger.info("DNS realm was renamed to %s" % dnsdomain)
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logger.info("Populating DNS partitions for new realm...")
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# Add the DNS objects for the new realm (note: the backup clone already
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# has the root server objects, so don't add them again)
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fill_dns_data_partitions(samdb, domainsid, site, domaindn,
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forestdn, dnsdomain, dnsforest, hostname,
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host_ip, host_ip6, domainguid, ntdsguid,
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dnsadmins_sid, add_root=False)
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def fix_old_dc_references(self, samdb):
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'''Fixes attributes that reference the old/removed DCs'''
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# we just want to fix up DB problems here that were introduced by us
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# removing the old DCs. We restrict what we fix up so that the restored
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# DB matches the backed-up DB as close as possible. (There may be other
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# DB issues inherited from the backed-up DC, but it's not our place to
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# silently try to fix them here).
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samdb.transaction_start()
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chk = dbcheck(samdb, quiet=True, fix=True, yes=False,
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in_transaction=True)
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# fix up stale references to the old DC
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setattr(chk, 'fix_all_old_dn_string_component_mismatch', 'ALL')
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attrs = ['lastKnownParent', 'interSiteTopologyGenerator']
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# fix-up stale one-way links that point to the old DC
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setattr(chk, 'remove_plausible_deleted_DN_links', 'ALL')
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attrs += ['msDS-NC-Replica-Locations']
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cross_ncs_ctrl = 'search_options:1:2'
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controls = ['show_deleted:1', cross_ncs_ctrl]
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chk.check_database(controls=controls, attrs=attrs)
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samdb.transaction_commit()
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def create_default_site(self, samdb, logger):
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'''Creates the default site, if it doesn't already exist'''
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sitename = DEFAULTSITE
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search_expr = "(&(cn={0})(objectclass=site))".format(sitename)
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res = samdb.search(samdb.get_config_basedn(), scope=ldb.SCOPE_SUBTREE,
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expression=search_expr)
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if len(res) == 0:
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logger.info("Creating default site '{0}'".format(sitename))
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sites.create_site(samdb, samdb.get_config_basedn(), sitename)
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return sitename
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def remove_backup_markers(self, samdb):
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"""Remove DB markers added by the backup process"""
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# check what markers we need to remove (this may vary)
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markers = ['sidForRestore', 'backupRename', 'backupDate', 'backupType']
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res = samdb.search(base=ldb.Dn(samdb, "@SAMBA_DSDB"),
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scope=ldb.SCOPE_BASE,
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attrs=markers)
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# remove any markers that exist in the DB
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m = ldb.Message()
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m.dn = ldb.Dn(samdb, "@SAMBA_DSDB")
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for attr in markers:
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if attr in res[0]:
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m[attr] = ldb.MessageElement([], ldb.FLAG_MOD_DELETE, attr)
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samdb.modify(m)
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def run(self, sambaopts=None, credopts=None, backup_file=None,
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targetdir=None, newservername=None, host_ip=None, host_ip6=None,
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site=None):
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if not (backup_file and os.path.exists(backup_file)):
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raise CommandError('Backup file not found.')
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if targetdir is None:
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raise CommandError('Please specify a target directory')
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# allow restoredc to install into a directory prepopulated by selftest
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if (os.path.exists(targetdir) and os.listdir(targetdir) and
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os.environ.get('SAMBA_SELFTEST') != '1'):
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raise CommandError('Target directory is not empty')
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if not newservername:
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raise CommandError('Server name required')
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logger = logging.getLogger()
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logger.setLevel(logging.DEBUG)
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logger.addHandler(logging.StreamHandler(sys.stdout))
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# ldapcmp prefers the server's netBIOS name in upper-case
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newservername = newservername.upper()
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# extract the backup .tar to a temp directory
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targetdir = os.path.abspath(targetdir)
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tf = tarfile.open(backup_file)
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tf.extractall(targetdir)
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tf.close()
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# use the smb.conf that got backed up, by default (save what was
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# actually backed up, before we mess with it)
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smbconf = os.path.join(targetdir, 'etc', 'smb.conf')
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shutil.copyfile(smbconf, smbconf + ".orig")
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# if a smb.conf was specified on the cmd line, then use that instead
|
|
cli_smbconf = sambaopts.get_loadparm_path()
|
|
if cli_smbconf:
|
|
logger.info("Using %s as restored domain's smb.conf" % cli_smbconf)
|
|
shutil.copyfile(cli_smbconf, smbconf)
|
|
|
|
lp = samba.param.LoadParm()
|
|
lp.load(smbconf)
|
|
|
|
# open a DB connection to the restored DB
|
|
private_dir = os.path.join(targetdir, 'private')
|
|
samdb_path = os.path.join(private_dir, 'sam.ldb')
|
|
samdb = SamDB(url=samdb_path, session_info=system_session(), lp=lp)
|
|
|
|
if site is None:
|
|
# There's no great way to work out the correct site to add the
|
|
# restored DC to. By default, add it to Default-First-Site-Name,
|
|
# creating the site if it doesn't already exist
|
|
site = self.create_default_site(samdb, logger)
|
|
logger.info("Adding new DC to site '{0}'".format(site))
|
|
|
|
# Create account using the join_add_objects function in the join object
|
|
# We need namingContexts, account control flags, and the sid saved by
|
|
# the backup process.
|
|
res = samdb.search(base="", scope=ldb.SCOPE_BASE,
|
|
attrs=['namingContexts'])
|
|
ncs = [str(r) for r in res[0].get('namingContexts')]
|
|
|
|
creds = credopts.get_credentials(lp)
|
|
ctx = DCJoinContext(logger, creds=creds, lp=lp, site=site,
|
|
forced_local_samdb=samdb,
|
|
netbios_name=newservername)
|
|
ctx.nc_list = ncs
|
|
ctx.full_nc_list = ncs
|
|
ctx.userAccountControl = (samba.dsdb.UF_SERVER_TRUST_ACCOUNT |
|
|
samba.dsdb.UF_TRUSTED_FOR_DELEGATION)
|
|
|
|
# rewrite the smb.conf to make sure it uses the new targetdir settings.
|
|
# (This doesn't update all filepaths in a customized config, but it
|
|
# corrects the same paths that get set by a new provision)
|
|
logger.info('Updating basic smb.conf settings...')
|
|
make_smbconf(smbconf, newservername, ctx.domain_name,
|
|
ctx.realm, targetdir, lp=lp,
|
|
serverrole="active directory domain controller")
|
|
|
|
# Get the SID saved by the backup process and create account
|
|
res = samdb.search(base=ldb.Dn(samdb, "@SAMBA_DSDB"),
|
|
scope=ldb.SCOPE_BASE,
|
|
attrs=['sidForRestore', 'backupRename'])
|
|
is_rename = True if 'backupRename' in res[0] else False
|
|
sid = res[0].get('sidForRestore')[0]
|
|
logger.info('Creating account with SID: ' + str(sid))
|
|
ctx.join_add_objects(specified_sid=dom_sid(str(sid)))
|
|
|
|
m = ldb.Message()
|
|
m.dn = ldb.Dn(samdb, '@ROOTDSE')
|
|
ntds_guid = str(ctx.ntds_guid)
|
|
m["dsServiceName"] = ldb.MessageElement("<GUID=%s>" % ntds_guid,
|
|
ldb.FLAG_MOD_REPLACE,
|
|
"dsServiceName")
|
|
samdb.modify(m)
|
|
|
|
# if we renamed the backed-up domain, then we need to add the DNS
|
|
# objects for the new realm (we do this in the restore, now that we
|
|
# know the new DC's IP address)
|
|
if is_rename:
|
|
self.register_dns_zone(logger, samdb, lp, ctx.ntds_guid,
|
|
host_ip, host_ip6, site)
|
|
|
|
secrets_path = os.path.join(private_dir, 'secrets.ldb')
|
|
secrets_ldb = Ldb(secrets_path, session_info=system_session(), lp=lp)
|
|
secretsdb_self_join(secrets_ldb, domain=ctx.domain_name,
|
|
realm=ctx.realm, dnsdomain=ctx.dnsdomain,
|
|
netbiosname=ctx.myname, domainsid=ctx.domsid,
|
|
machinepass=ctx.acct_pass,
|
|
key_version_number=ctx.key_version_number,
|
|
secure_channel_type=misc.SEC_CHAN_BDC)
|
|
|
|
# Seize DNS roles
|
|
domain_dn = samdb.domain_dn()
|
|
forest_dn = samba.dn_from_dns_name(samdb.forest_dns_name())
|
|
domaindns_dn = ("CN=Infrastructure,DC=DomainDnsZones,", domain_dn)
|
|
forestdns_dn = ("CN=Infrastructure,DC=ForestDnsZones,", forest_dn)
|
|
for dn_prefix, dns_dn in [forestdns_dn, domaindns_dn]:
|
|
if dns_dn not in ncs:
|
|
continue
|
|
full_dn = dn_prefix + dns_dn
|
|
m = ldb.Message()
|
|
m.dn = ldb.Dn(samdb, full_dn)
|
|
m["fSMORoleOwner"] = ldb.MessageElement(samdb.get_dsServiceName(),
|
|
ldb.FLAG_MOD_REPLACE,
|
|
"fSMORoleOwner")
|
|
samdb.modify(m)
|
|
|
|
# Seize other roles
|
|
for role in ['rid', 'pdc', 'naming', 'infrastructure', 'schema']:
|
|
self.seize_role(role, samdb, force=True)
|
|
|
|
# Get all DCs and remove them (this ensures these DCs cannot
|
|
# replicate because they will not have a password)
|
|
search_expr = "(&(objectClass=Server)(serverReference=*))"
|
|
res = samdb.search(samdb.get_config_basedn(), scope=ldb.SCOPE_SUBTREE,
|
|
expression=search_expr)
|
|
for m in res:
|
|
cn = str(m.get('cn')[0])
|
|
if cn != newservername:
|
|
remove_dc(samdb, logger, cn)
|
|
|
|
# Remove the repsFrom and repsTo from each NC to ensure we do
|
|
# not try (and fail) to talk to the old DCs
|
|
for nc in ncs:
|
|
msg = ldb.Message()
|
|
msg.dn = ldb.Dn(samdb, nc)
|
|
|
|
msg["repsFrom"] = ldb.MessageElement([],
|
|
ldb.FLAG_MOD_REPLACE,
|
|
"repsFrom")
|
|
msg["repsTo"] = ldb.MessageElement([],
|
|
ldb.FLAG_MOD_REPLACE,
|
|
"repsTo")
|
|
samdb.modify(msg)
|
|
|
|
# Update the krbtgt passwords twice, ensuring no tickets from
|
|
# the old domain are valid
|
|
update_krbtgt_account_password(samdb)
|
|
update_krbtgt_account_password(samdb)
|
|
|
|
# restore the sysvol directory from the backup tar file, including the
|
|
# original NTACLs. Note that the backup_restore() will fail if not root
|
|
sysvol_tar = os.path.join(targetdir, 'sysvol.tar.gz')
|
|
dest_sysvol_dir = lp.get('path', 'sysvol')
|
|
if not os.path.exists(dest_sysvol_dir):
|
|
os.makedirs(dest_sysvol_dir)
|
|
backup_restore(sysvol_tar, dest_sysvol_dir, samdb, smbconf)
|
|
os.remove(sysvol_tar)
|
|
|
|
# fix up any stale links to the old DCs we just removed
|
|
logger.info("Fixing up any remaining references to the old DCs...")
|
|
self.fix_old_dc_references(samdb)
|
|
|
|
# Remove DB markers added by the backup process
|
|
self.remove_backup_markers(samdb)
|
|
|
|
logger.info("Backup file successfully restored to %s" % targetdir)
|
|
logger.info("Please check the smb.conf settings are correct before "
|
|
"starting samba.")
|
|
|
|
|
|
class cmd_domain_backup_rename(samba.netcmd.Command):
|
|
'''Copy a running DC's DB to backup file, renaming the domain in the process.
|
|
|
|
Where <new-domain> is the new domain's NetBIOS name, and <new-dnsrealm> is
|
|
the new domain's realm in DNS form.
|
|
|
|
This is similar to 'samba-tool backup online' in that it clones the DB of a
|
|
running DC. However, this option also renames all the domain entries in the
|
|
DB. Renaming the domain makes it possible to restore and start a new Samba
|
|
DC without it interfering with the existing Samba domain. In other words,
|
|
you could use this option to clone your production samba domain and restore
|
|
it to a separate pre-production environment that won't overlap or interfere
|
|
with the existing production Samba domain.
|
|
|
|
Note that:
|
|
- it's recommended to run 'samba-tool dbcheck' before taking a backup-file
|
|
and fix any errors it reports.
|
|
- all the domain's secrets are included in the backup file.
|
|
- although the DB contents can be untarred and examined manually, you need
|
|
to run 'samba-tool domain backup restore' before you can start a Samba DC
|
|
from the backup file.
|
|
- GPO and sysvol information will still refer to the old realm and will
|
|
need to be updated manually.
|
|
- if you specify 'keep-dns-realm', then the DNS records will need updating
|
|
in order to work (they will still refer to the old DC's IP instead of the
|
|
new DC's address).
|
|
- we recommend that you only use this option if you know what you're doing.
|
|
'''
|
|
|
|
synopsis = ("%prog <new-domain> <new-dnsrealm> --server=<DC-to-backup> "
|
|
"--targetdir=<output-dir>")
|
|
takes_optiongroups = {
|
|
"sambaopts": options.SambaOptions,
|
|
"credopts": options.CredentialsOptions,
|
|
}
|
|
|
|
takes_options = [
|
|
Option("--server", help="The DC to backup", type=str),
|
|
Option("--targetdir", help="Directory to write the backup file",
|
|
type=str),
|
|
Option("--keep-dns-realm", action="store_true", default=False,
|
|
help="Retain the DNS entries for the old realm in the backup"),
|
|
Option("--no-secrets", action="store_true", default=False,
|
|
help="Exclude secret values from the backup created"),
|
|
Option("--backend-store", type="choice", metavar="BACKENDSTORE",
|
|
choices=["tdb", "mdb"],
|
|
help="Specify the database backend to be used "
|
|
"(default is %s)" % get_default_backend_store()),
|
|
]
|
|
|
|
takes_args = ["new_domain_name", "new_dns_realm"]
|
|
|
|
def update_dns_root(self, logger, samdb, old_realm, delete_old_dns):
|
|
'''Updates dnsRoot for the partition objects to reflect the rename'''
|
|
|
|
# lookup the crossRef objects that hold the old realm's dnsRoot
|
|
partitions_dn = samdb.get_partitions_dn()
|
|
res = samdb.search(base=partitions_dn, scope=ldb.SCOPE_ONELEVEL,
|
|
attrs=["dnsRoot"],
|
|
expression='(&(objectClass=crossRef)(dnsRoot=*))')
|
|
new_realm = samdb.domain_dns_name()
|
|
|
|
# go through and add the new realm
|
|
for res_msg in res:
|
|
# dnsRoot can be multi-valued, so only look for the old realm
|
|
for dns_root in res_msg["dnsRoot"]:
|
|
dns_root = str(dns_root)
|
|
dn = res_msg.dn
|
|
if old_realm in dns_root:
|
|
new_dns_root = re.sub('%s$' % old_realm, new_realm,
|
|
dns_root)
|
|
logger.info("Adding %s dnsRoot to %s" % (new_dns_root, dn))
|
|
|
|
m = ldb.Message()
|
|
m.dn = dn
|
|
m["dnsRoot"] = ldb.MessageElement(new_dns_root,
|
|
ldb.FLAG_MOD_ADD,
|
|
"dnsRoot")
|
|
samdb.modify(m)
|
|
|
|
# optionally remove the dnsRoot for the old realm
|
|
if delete_old_dns:
|
|
logger.info("Removing %s dnsRoot from %s" % (dns_root,
|
|
dn))
|
|
m["dnsRoot"] = ldb.MessageElement(dns_root,
|
|
ldb.FLAG_MOD_DELETE,
|
|
"dnsRoot")
|
|
samdb.modify(m)
|
|
|
|
# Updates the CN=<domain>,CN=Partitions,CN=Configuration,... object to
|
|
# reflect the domain rename
|
|
def rename_domain_partition(self, logger, samdb, new_netbios_name):
|
|
'''Renames the domain parition object and updates its nETBIOSName'''
|
|
|
|
# lookup the crossRef object that holds the nETBIOSName (nCName has
|
|
# already been updated by this point, but the netBIOS hasn't)
|
|
base_dn = samdb.get_default_basedn()
|
|
nc_name = ldb.binary_encode(str(base_dn))
|
|
partitions_dn = samdb.get_partitions_dn()
|
|
res = samdb.search(base=partitions_dn, scope=ldb.SCOPE_ONELEVEL,
|
|
attrs=["nETBIOSName"],
|
|
expression='ncName=%s' % nc_name)
|
|
|
|
logger.info("Changing backup domain's NetBIOS name to %s" %
|
|
new_netbios_name)
|
|
m = ldb.Message()
|
|
m.dn = res[0].dn
|
|
m["nETBIOSName"] = ldb.MessageElement(new_netbios_name,
|
|
ldb.FLAG_MOD_REPLACE,
|
|
"nETBIOSName")
|
|
samdb.modify(m)
|
|
|
|
# renames the object itself to reflect the change in domain
|
|
new_dn = "CN=%s,%s" % (new_netbios_name, partitions_dn)
|
|
logger.info("Renaming %s --> %s" % (res[0].dn, new_dn))
|
|
samdb.rename(res[0].dn, new_dn, controls=['relax:0'])
|
|
|
|
def delete_old_dns_zones(self, logger, samdb, old_realm):
|
|
# remove the top-level DNS entries for the old realm
|
|
basedn = samdb.get_default_basedn()
|
|
dn = "DC=%s,CN=MicrosoftDNS,DC=DomainDnsZones,%s" % (old_realm, basedn)
|
|
logger.info("Deleting old DNS zone %s" % dn)
|
|
samdb.delete(dn, ["tree_delete:1"])
|
|
|
|
forestdn = samdb.get_root_basedn().get_linearized()
|
|
dn = "DC=_msdcs.%s,CN=MicrosoftDNS,DC=ForestDnsZones,%s" % (old_realm,
|
|
forestdn)
|
|
logger.info("Deleting old DNS zone %s" % dn)
|
|
samdb.delete(dn, ["tree_delete:1"])
|
|
|
|
def fix_old_dn_attributes(self, samdb):
|
|
'''Fixes attributes (i.e. objectCategory) that still use the old DN'''
|
|
|
|
samdb.transaction_start()
|
|
# Just fix any mismatches in DN detected (leave any other errors)
|
|
chk = dbcheck(samdb, quiet=True, fix=True, yes=False,
|
|
in_transaction=True)
|
|
# fix up incorrect objectCategory/etc attributes
|
|
setattr(chk, 'fix_all_old_dn_string_component_mismatch', 'ALL')
|
|
cross_ncs_ctrl = 'search_options:1:2'
|
|
controls = ['show_deleted:1', cross_ncs_ctrl]
|
|
chk.check_database(controls=controls)
|
|
samdb.transaction_commit()
|
|
|
|
def run(self, new_domain_name, new_dns_realm, sambaopts=None,
|
|
credopts=None, server=None, targetdir=None, keep_dns_realm=False,
|
|
no_secrets=False, backend_store=None):
|
|
logger = self.get_logger()
|
|
logger.setLevel(logging.INFO)
|
|
|
|
lp = sambaopts.get_loadparm()
|
|
creds = credopts.get_credentials(lp)
|
|
|
|
# Make sure we have all the required args.
|
|
if server is None:
|
|
raise CommandError('Server required')
|
|
|
|
check_targetdir(logger, targetdir)
|
|
|
|
delete_old_dns = not keep_dns_realm
|
|
|
|
new_dns_realm = new_dns_realm.lower()
|
|
new_domain_name = new_domain_name.upper()
|
|
|
|
new_base_dn = samba.dn_from_dns_name(new_dns_realm)
|
|
logger.info("New realm for backed up domain: %s" % new_dns_realm)
|
|
logger.info("New base DN for backed up domain: %s" % new_base_dn)
|
|
logger.info("New domain NetBIOS name: %s" % new_domain_name)
|
|
|
|
tmpdir = tempfile.mkdtemp(dir=targetdir)
|
|
|
|
# setup a join-context for cloning the remote server
|
|
include_secrets = not no_secrets
|
|
ctx = DCCloneAndRenameContext(new_base_dn, new_domain_name,
|
|
new_dns_realm, logger=logger,
|
|
creds=creds, lp=lp,
|
|
include_secrets=include_secrets,
|
|
dns_backend='SAMBA_INTERNAL',
|
|
server=server, targetdir=tmpdir,
|
|
backend_store=backend_store)
|
|
|
|
# sanity-check we're not "renaming" the domain to the same values
|
|
old_domain = ctx.domain_name
|
|
if old_domain == new_domain_name:
|
|
shutil.rmtree(tmpdir)
|
|
raise CommandError("Cannot use the current domain NetBIOS name.")
|
|
|
|
old_realm = ctx.realm
|
|
if old_realm == new_dns_realm:
|
|
shutil.rmtree(tmpdir)
|
|
raise CommandError("Cannot use the current domain DNS realm.")
|
|
|
|
# do the clone/rename
|
|
ctx.do_join()
|
|
|
|
# get the paths used for the clone, then drop the old samdb connection
|
|
del ctx.local_samdb
|
|
paths = ctx.paths
|
|
|
|
# get a free RID to use as the new DC's SID (when it gets restored)
|
|
remote_sam = SamDB(url='ldap://' + server, credentials=creds,
|
|
session_info=system_session(), lp=lp)
|
|
new_sid = get_sid_for_restore(remote_sam)
|
|
|
|
# Grab the remote DC's sysvol files and bundle them into a tar file.
|
|
# Note we end up with 2 sysvol dirs - the original domain's files (that
|
|
# use the old realm) backed here, as well as default files generated
|
|
# for the new realm as part of the clone/join.
|
|
sysvol_tar = os.path.join(tmpdir, 'sysvol.tar.gz')
|
|
smb_conn = smb.SMB(server, "sysvol", lp=lp, creds=creds, sign=True)
|
|
backup_online(smb_conn, sysvol_tar, remote_sam.get_domain_sid())
|
|
|
|
# connect to the local DB (making sure we use the new/renamed config)
|
|
lp.load(paths.smbconf)
|
|
samdb = SamDB(url=paths.samdb, session_info=system_session(), lp=lp)
|
|
|
|
# Edit the cloned sam.ldb to mark it as a backup
|
|
time_str = get_timestamp()
|
|
add_backup_marker(samdb, "backupDate", time_str)
|
|
add_backup_marker(samdb, "sidForRestore", new_sid)
|
|
add_backup_marker(samdb, "backupRename", old_realm)
|
|
add_backup_marker(samdb, "backupType", "rename")
|
|
|
|
# fix up the DNS objects that are using the old dnsRoot value
|
|
self.update_dns_root(logger, samdb, old_realm, delete_old_dns)
|
|
|
|
# update the netBIOS name and the Partition object for the domain
|
|
self.rename_domain_partition(logger, samdb, new_domain_name)
|
|
|
|
if delete_old_dns:
|
|
self.delete_old_dns_zones(logger, samdb, old_realm)
|
|
|
|
logger.info("Fixing DN attributes after rename...")
|
|
self.fix_old_dn_attributes(samdb)
|
|
|
|
# ensure the admin user always has a password set (same as provision)
|
|
if no_secrets:
|
|
set_admin_password(logger, samdb)
|
|
|
|
# Add everything in the tmpdir to the backup tar file
|
|
backup_file = backup_filepath(targetdir, new_dns_realm, time_str)
|
|
create_log_file(tmpdir, lp, "rename", server, include_secrets,
|
|
"Original domain %s (NetBIOS), %s (DNS realm)" %
|
|
(old_domain, old_realm))
|
|
create_backup_tar(logger, tmpdir, backup_file)
|
|
|
|
shutil.rmtree(tmpdir)
|
|
|
|
|
|
class cmd_domain_backup_offline(samba.netcmd.Command):
|
|
'''Backup the local domain directories safely into a tar file.
|
|
|
|
Takes a backup copy of the current domain from the local files on disk,
|
|
with proper locking of the DB to ensure consistency. If the domain were to
|
|
undergo a catastrophic failure, then the backup file can be used to recover
|
|
the domain.
|
|
|
|
An offline backup differs to an online backup in the following ways:
|
|
- a backup can be created even if the DC isn't currently running.
|
|
- includes non-replicated attributes that an online backup wouldn't store.
|
|
- takes a copy of the raw database files, which has the risk that any
|
|
hidden problems in the DB are preserved in the backup.'''
|
|
|
|
synopsis = "%prog [options]"
|
|
takes_optiongroups = {
|
|
"sambaopts": options.SambaOptions,
|
|
}
|
|
|
|
takes_options = [
|
|
Option("--targetdir",
|
|
help="Output directory (required)",
|
|
type=str),
|
|
]
|
|
|
|
backup_ext = '.bak-offline'
|
|
|
|
def offline_tdb_copy(self, path):
|
|
backup_path = path + self.backup_ext
|
|
try:
|
|
tdb_copy(path, backup_path, readonly=True)
|
|
except CalledProcessError as copy_err:
|
|
# If the copy didn't work, check if it was caused by an EINVAL
|
|
# error on opening the DB. If so, it's a mutex locked database,
|
|
# which we can safely ignore.
|
|
try:
|
|
tdb.open(path)
|
|
except Exception as e:
|
|
if hasattr(e, 'errno') and e.errno == errno.EINVAL:
|
|
return
|
|
raise e
|
|
raise copy_err
|
|
if not os.path.exists(backup_path):
|
|
s = "tdbbackup said backup succeeded but {0} not found"
|
|
raise CommandError(s.format(backup_path))
|
|
|
|
def offline_mdb_copy(self, path):
|
|
mdb_copy(path, path + self.backup_ext)
|
|
|
|
# Secrets databases are a special case: a transaction must be started
|
|
# on the secrets.ldb file before backing up that file and secrets.tdb
|
|
def backup_secrets(self, private_dir, lp, logger):
|
|
secrets_path = os.path.join(private_dir, 'secrets')
|
|
secrets_obj = Ldb(secrets_path + '.ldb', lp=lp)
|
|
logger.info('Starting transaction on ' + secrets_path)
|
|
secrets_obj.transaction_start()
|
|
self.offline_tdb_copy(secrets_path + '.ldb')
|
|
self.offline_tdb_copy(secrets_path + '.tdb')
|
|
secrets_obj.transaction_cancel()
|
|
|
|
# sam.ldb must have a transaction started on it before backing up
|
|
# everything in sam.ldb.d with the appropriate backup function.
|
|
def backup_smb_dbs(self, private_dir, samdb, lp, logger):
|
|
# First, determine if DB backend is MDB. Assume not unless there is a
|
|
# 'backendStore' attribute on @PARTITION containing the text 'mdb'
|
|
store_label = "backendStore"
|
|
res = samdb.search(base="@PARTITION", scope=ldb.SCOPE_BASE,
|
|
attrs=[store_label])
|
|
mdb_backend = store_label in res[0] and str(res[0][store_label][0]) == 'mdb'
|
|
|
|
sam_ldb_path = os.path.join(private_dir, 'sam.ldb')
|
|
copy_function = None
|
|
if mdb_backend:
|
|
logger.info('MDB backend detected. Using mdb backup function.')
|
|
copy_function = self.offline_mdb_copy
|
|
else:
|
|
logger.info('Starting transaction on ' + sam_ldb_path)
|
|
copy_function = self.offline_tdb_copy
|
|
sam_obj = Ldb(sam_ldb_path, lp=lp)
|
|
sam_obj.transaction_start()
|
|
|
|
logger.info(' backing up ' + sam_ldb_path)
|
|
self.offline_tdb_copy(sam_ldb_path)
|
|
sam_ldb_d = sam_ldb_path + '.d'
|
|
for sam_file in os.listdir(sam_ldb_d):
|
|
sam_file = os.path.join(sam_ldb_d, sam_file)
|
|
if sam_file.endswith('.ldb'):
|
|
logger.info(' backing up locked/related file ' + sam_file)
|
|
copy_function(sam_file)
|
|
else:
|
|
logger.info(' copying locked/related file ' + sam_file)
|
|
shutil.copyfile(sam_file, sam_file + self.backup_ext)
|
|
|
|
if not mdb_backend:
|
|
sam_obj.transaction_cancel()
|
|
|
|
# Find where a path should go in the fixed backup archive structure.
|
|
def get_arc_path(self, path, conf_paths):
|
|
backup_dirs = {"private": conf_paths.private_dir,
|
|
"statedir": conf_paths.state_dir,
|
|
"etc": os.path.dirname(conf_paths.smbconf)}
|
|
matching_dirs = [(_, p) for (_, p) in backup_dirs.items() if
|
|
path.startswith(p)]
|
|
arc_path, fs_path = matching_dirs[0]
|
|
|
|
# If more than one directory is a parent of this path, then at least
|
|
# one configured path is a subdir of another. Use closest match.
|
|
if len(matching_dirs) > 1:
|
|
arc_path, fs_path = max(matching_dirs, key=lambda p: len(p[1]))
|
|
arc_path += path[len(fs_path):]
|
|
|
|
return arc_path
|
|
|
|
def run(self, sambaopts=None, targetdir=None):
|
|
|
|
logger = logging.getLogger()
|
|
logger.setLevel(logging.DEBUG)
|
|
logger.addHandler(logging.StreamHandler(sys.stdout))
|
|
|
|
# Get the absolute paths of all the directories we're going to backup
|
|
lp = sambaopts.get_loadparm()
|
|
|
|
paths = samba.provision.provision_paths_from_lp(lp, lp.get('realm'))
|
|
if not (paths.samdb and os.path.exists(paths.samdb)):
|
|
raise CommandError('No sam.db found. This backup ' +
|
|
'tool is only for AD DCs')
|
|
|
|
check_targetdir(logger, targetdir)
|
|
|
|
samdb = SamDB(url=paths.samdb, session_info=system_session(), lp=lp)
|
|
sid = get_sid_for_restore(samdb)
|
|
|
|
backup_dirs = [paths.private_dir, paths.state_dir,
|
|
os.path.dirname(paths.smbconf)] # etc dir
|
|
logger.info('running backup on dirs: {0}'.format(' '.join(backup_dirs)))
|
|
|
|
# Recursively get all file paths in the backup directories
|
|
all_files = []
|
|
for backup_dir in backup_dirs:
|
|
for (working_dir, _, filenames) in os.walk(backup_dir):
|
|
if working_dir.startswith(paths.sysvol):
|
|
continue
|
|
if working_dir.endswith('.sock') or '.sock/' in working_dir:
|
|
continue
|
|
|
|
for filename in filenames:
|
|
if filename in all_files:
|
|
continue
|
|
|
|
# Assume existing backup files are from a previous backup.
|
|
# Delete and ignore.
|
|
if filename.endswith(self.backup_ext):
|
|
os.remove(os.path.join(working_dir, filename))
|
|
continue
|
|
|
|
# Sock files are autogenerated at runtime, ignore.
|
|
if filename.endswith('.sock'):
|
|
continue
|
|
|
|
all_files.append(os.path.join(working_dir, filename))
|
|
|
|
# Backup secrets, sam.ldb and their downstream files
|
|
self.backup_secrets(paths.private_dir, lp, logger)
|
|
self.backup_smb_dbs(paths.private_dir, samdb, lp, logger)
|
|
|
|
# Open the new backed up samdb, flag it as backed up, and write
|
|
# the next SID so the restore tool can add objects.
|
|
# WARNING: Don't change this code unless you know what you're doing.
|
|
# Writing to a .bak file only works because the DN being
|
|
# written to happens to be top level.
|
|
samdb = SamDB(url=paths.samdb + self.backup_ext,
|
|
session_info=system_session(), lp=lp)
|
|
time_str = get_timestamp()
|
|
add_backup_marker(samdb, "backupDate", time_str)
|
|
add_backup_marker(samdb, "sidForRestore", sid)
|
|
add_backup_marker(samdb, "backupType", "offline")
|
|
|
|
# Now handle all the LDB and TDB files that are not linked to
|
|
# anything else. Use transactions for LDBs.
|
|
for path in all_files:
|
|
if not os.path.exists(path + self.backup_ext):
|
|
if path.endswith('.ldb'):
|
|
logger.info('Starting transaction on solo db: ' + path)
|
|
ldb_obj = Ldb(path, lp=lp)
|
|
ldb_obj.transaction_start()
|
|
logger.info(' running tdbbackup on the same file')
|
|
self.offline_tdb_copy(path)
|
|
ldb_obj.transaction_cancel()
|
|
elif path.endswith('.tdb'):
|
|
logger.info('running tdbbackup on lone tdb file ' + path)
|
|
self.offline_tdb_copy(path)
|
|
|
|
# Now make the backup tar file and add all
|
|
# backed up files and any other files to it.
|
|
temp_tar_dir = tempfile.mkdtemp(dir=targetdir,
|
|
prefix='INCOMPLETEsambabackupfile')
|
|
temp_tar_name = os.path.join(temp_tar_dir, "samba-backup.tar.bz2")
|
|
tar = tarfile.open(temp_tar_name, 'w:bz2')
|
|
|
|
logger.info('running offline ntacl backup of sysvol')
|
|
sysvol_tar_fn = 'sysvol.tar.gz'
|
|
sysvol_tar = os.path.join(temp_tar_dir, sysvol_tar_fn)
|
|
backup_offline(paths.sysvol, sysvol_tar, samdb, paths.smbconf)
|
|
tar.add(sysvol_tar, sysvol_tar_fn)
|
|
os.remove(sysvol_tar)
|
|
|
|
create_log_file(temp_tar_dir, lp, "offline", "localhost", True)
|
|
backup_fn = os.path.join(temp_tar_dir, "backup.txt")
|
|
tar.add(backup_fn, os.path.basename(backup_fn))
|
|
os.remove(backup_fn)
|
|
|
|
logger.info('building backup tar')
|
|
for path in all_files:
|
|
arc_path = self.get_arc_path(path, paths)
|
|
|
|
if os.path.exists(path + self.backup_ext):
|
|
logger.info(' adding backup ' + arc_path + self.backup_ext +
|
|
' to tar and deleting file')
|
|
tar.add(path + self.backup_ext, arcname=arc_path)
|
|
os.remove(path + self.backup_ext)
|
|
elif path.endswith('.ldb') or path.endswith('.tdb'):
|
|
logger.info(' skipping ' + arc_path)
|
|
else:
|
|
logger.info(' adding misc file ' + arc_path)
|
|
tar.add(path, arcname=arc_path)
|
|
|
|
tar.close()
|
|
os.rename(temp_tar_name,
|
|
os.path.join(targetdir,
|
|
'samba-backup-{0}.tar.bz2'.format(time_str)))
|
|
os.rmdir(temp_tar_dir)
|
|
logger.info('Backup succeeded.')
|
|
|
|
|
|
class cmd_domain_backup(samba.netcmd.SuperCommand):
|
|
'''Create or restore a backup of the domain.'''
|
|
subcommands = {'offline': cmd_domain_backup_offline(),
|
|
'online': cmd_domain_backup_online(),
|
|
'rename': cmd_domain_backup_rename(),
|
|
'restore': cmd_domain_backup_restore()}
|