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|
# Unix SMB/CIFS implementation.
# Copyright (C) Andrew Bartlett <abartlet@samba.org>
#
# 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/>.
#
from samba import provision, param
import os
import shutil
from samba.tests import (env_loadparm, create_test_ou, BlackboxProcessError,
BlackboxTestCase, connect_samdb)
import ldb
from samba.samdb import SamDB
from samba.auth import system_session
from samba import Ldb, dn_from_dns_name
from samba.netcmd.fsmo import get_fsmo_roleowner
import re
from samba import sites
from samba.dsdb import _dsdb_load_udv_v2
from samba import safe_tarfile as tarfile
def get_prim_dom(secrets_path, lp):
secrets_ldb = Ldb(secrets_path, session_info=system_session(), lp=lp)
return secrets_ldb.search(base="CN=Primary Domains",
attrs=['objectClass', 'samAccountName',
'secret', 'msDS-KeyVersionNumber'],
scope=ldb.SCOPE_SUBTREE,
expression="(objectClass=kerberosSecret)")
# The backup tests require that a completely clean LoadParm object gets used
# for the restore. Otherwise the same global LP gets re-used, and the LP
# settings can bleed from one test case to another.
# To do this, these tests should use check_output(), which executes the command
# in a separate process (as opposed to runcmd(), runsubcmd()).
# So although this is a samba-tool test, we don't inherit from SambaToolCmdTest
# so that we never inadvertently use .runcmd() by accident.
class DomainBackupBase(BlackboxTestCase):
def setUp(self):
super().setUp()
server = os.environ["DC_SERVER"]
self.user_auth = "-U%s%%%s" % (os.environ["DC_USERNAME"],
os.environ["DC_PASSWORD"])
# LDB connection to the original server being backed up
self.ldb = connect_samdb("ldap://%s" % server)
self.new_server = "BACKUPSERV"
self.server = server.upper()
self.base_cmd = None
self.backup_markers = ['sidForRestore', 'backupDate']
self.restore_domain = os.environ["DOMAIN"]
self.restore_realm = os.environ["REALM"]
self.backend = None
def use_backend(self, backend):
"""Explicitly set the DB backend that the backup should use"""
self.backend = backend
self.base_cmd += ["--backend-store=" + backend]
def get_expected_partitions(self, samdb):
basedn = str(samdb.get_default_basedn())
config_dn = "CN=Configuration,%s" % basedn
return [basedn, config_dn, "CN=Schema,%s" % config_dn,
"DC=DomainDnsZones,%s" % basedn,
"DC=ForestDnsZones,%s" % basedn]
def assert_partitions_present(self, samdb):
"""Asserts all expected partitions are present in the backup samdb"""
res = samdb.search(base="", scope=ldb.SCOPE_BASE,
attrs=['namingContexts'])
actual_ncs = [str(r) for r in res[0].get('namingContexts')]
expected_ncs = self.get_expected_partitions(samdb)
for nc in expected_ncs:
self.assertTrue(nc in actual_ncs,
"%s not in %s" % (nc, str(actual_ncs)))
def assert_repl_uptodate_vector(self, samdb):
"""Asserts an replUpToDateVector entry exists for the original DC"""
orig_invoc_id = self.ldb.get_invocation_id()
expected_ncs = self.get_expected_partitions(samdb)
# loop through the partitions and check the upToDateness vector
for nc in expected_ncs:
found = False
for cursor in _dsdb_load_udv_v2(samdb, nc):
if orig_invoc_id == str(cursor.source_dsa_invocation_id):
found = True
break
self.assertTrue(found, "Couldn't find UDTV for original DC")
def assert_dcs_present(self, samdb, expected_server, expected_count=None):
"""Checks that the expected server is present in the restored DB"""
search_expr = "(&(objectClass=Server)(serverReference=*))"
res = samdb.search(samdb.get_config_basedn(),
scope=ldb.SCOPE_SUBTREE,
expression=search_expr)
server_found = False
for msg in res:
if expected_server in str(msg.dn):
server_found = True
self.assertTrue(server_found,
"Could not find %s server" % expected_server)
if expected_count:
self.assertTrue(len(res) == expected_count)
def restore_dir(self):
extract_dir = os.path.join(self.tempdir, 'tree')
if not os.path.exists(extract_dir):
os.mkdir(extract_dir)
self.addCleanup(shutil.rmtree, extract_dir)
return extract_dir
def untar_backup(self, backup_file):
"""Untar the backup file's raw contents (i.e. not a proper restore)"""
extract_dir = self.restore_dir()
with tarfile.open(backup_file) as tf:
tf.extractall(extract_dir)
def _test_backup_untar(self, primary_domain_secrets=0):
"""Creates a backup, untars the raw files, and sanity-checks the DB"""
backup_file = self.create_backup()
self.untar_backup(backup_file)
private_dir = os.path.join(self.restore_dir(), "private")
samdb_path = os.path.join(private_dir, "sam.ldb")
lp = env_loadparm()
samdb = SamDB(url=samdb_path, session_info=system_session(), lp=lp)
# check that backup markers were added to the DB
res = samdb.search(base=ldb.Dn(samdb, "@SAMBA_DSDB"),
scope=ldb.SCOPE_BASE,
attrs=self.backup_markers)
self.assertEqual(len(res), 1)
for marker in self.backup_markers:
self.assertIsNotNone(res[0].get(marker),
"%s backup marker missing" % marker)
# check the secrets.ldb entry for the primary domain. (Online/clone
# backups shouldn't have this, as they never got it during the backup)
secrets_path = os.path.join(private_dir, "secrets.ldb")
res = get_prim_dom(secrets_path, lp)
self.assertEqual(len(res), primary_domain_secrets)
# sanity-check that all the partitions got backed up
self.assert_partitions_present(samdb)
def _test_backup_restore(self):
"""Does a backup/restore, with specific checks of the resulting DB"""
backup_file = self.create_backup()
self.restore_backup(backup_file)
lp = self.check_restored_smbconf()
self.check_restored_database(lp)
def _test_backup_restore_no_secrets(self):
"""Does a backup/restore with secrets excluded from the resulting DB"""
# exclude secrets when we create the backup
backup_file = self.create_backup(extra_args=["--no-secrets"])
self.restore_backup(backup_file)
lp = self.check_restored_smbconf()
# assert that we don't find user secrets in the DB
self.check_restored_database(lp, expect_secrets=False)
def _test_backup_restore_into_site(self):
"""Does a backup and restores into a non-default site"""
# create a new non-default site
sitename = "Test-Site-For-Backups"
sites.create_site(self.ldb, self.ldb.get_config_basedn(), sitename)
self.addCleanup(sites.delete_site, self.ldb,
self.ldb.get_config_basedn(), sitename)
# restore the backup DC into the site we just created
backup_file = self.create_backup()
self.restore_backup(backup_file, ["--site=" + sitename])
lp = self.check_restored_smbconf()
restored_ldb = self.check_restored_database(lp)
# check the restored DC was added to the site we created, i.e. there's
# an entry matching the new DC sitting underneath the site DN
site_dn = "CN={0},CN=Sites,{1}".format(sitename,
restored_ldb.get_config_basedn())
match_server = "(&(objectClass=server)(cn={0}))".format(self.new_server)
res = restored_ldb.search(site_dn, scope=ldb.SCOPE_SUBTREE,
expression=match_server)
self.assertTrue(len(res) == 1,
"Failed to find new DC under site")
def create_smbconf(self, settings):
"""Creates a very basic smb.conf to pass to the restore tool"""
# without the testenv config's settings, the NTACL backup_restore()
# operation will fail (because we're not root). So first suck in all
# testenv's settings, so we retain these in the new config. Note we
# use a non-global LP so that these settings don't leak into other
# places we use LoadParms
testenv_conf = os.environ["SMB_CONF_PATH"]
local_lp = param.LoadParm(filename_for_non_global_lp=testenv_conf)
# add the new settings to the LP, then write the settings to file
for key, val in settings.items():
local_lp.set(key, val)
new_smbconf = os.path.join(self.tempdir, "smb.conf")
local_lp.dump(False, new_smbconf)
self.addCleanup(os.remove, new_smbconf)
return new_smbconf
def _test_backup_restore_with_conf(self):
"""Checks smb.conf values passed to the restore are retained"""
backup_file = self.create_backup()
# create an smb.conf that we pass to the restore. The netbios/state
# dir should get overridden by the restore, the other settings should
# trickle through into the restored dir's smb.conf
settings = {'state directory': '/var/run',
'netbios name': 'FOOBAR',
'workgroup': 'NOTMYDOMAIN',
'realm': 'NOT.MY.REALM'}
assert_settings = {'drs: max link sync': '275',
'prefork children': '7'}
settings.update(assert_settings)
smbconf = self.create_smbconf(settings)
self.restore_backup(backup_file, ["--configfile=" + smbconf])
# this will check netbios name/state dir
lp = self.check_restored_smbconf()
self.check_restored_database(lp)
# check the remaining settings are still intact
for key, val in assert_settings.items():
self.assertEqual(str(lp.get(key)), val,
"'%s' was '%s' in smb.conf" % (key, lp.get(key)))
def check_restored_smbconf(self):
"""Sanity-check important smb.conf values are restored correctly"""
smbconf = os.path.join(self.restore_dir(), "etc", "smb.conf")
bkp_lp = param.LoadParm(filename_for_non_global_lp=smbconf)
self.assertEqual(bkp_lp.get('netbios name'), self.new_server)
self.assertEqual(bkp_lp.get('workgroup'), self.restore_domain)
self.assertEqual(bkp_lp.get('realm'), self.restore_realm.upper())
# we restore with a fixed directory structure, so we can sanity-check
# that the core filepaths settings are what we expect them to be
private_dir = os.path.join(self.restore_dir(), "private")
self.assertEqual(bkp_lp.get('private dir'), private_dir)
state_dir = os.path.join(self.restore_dir(), "state")
self.assertEqual(bkp_lp.get('state directory'), state_dir)
return bkp_lp
def check_restored_database(self, bkp_lp, expect_secrets=True):
paths = provision.provision_paths_from_lp(bkp_lp, bkp_lp.get("realm"))
bkp_pd = get_prim_dom(paths.secrets, bkp_lp)
self.assertEqual(len(bkp_pd), 1)
account = bkp_pd[0].get('samAccountName')
self.assertIsNotNone(account)
self.assertEqual(str(account[0]), self.new_server + '$')
self.assertIsNotNone(bkp_pd[0].get('secret'))
samdb = SamDB(url=paths.samdb, session_info=system_session(),
lp=bkp_lp, credentials=self.get_credentials())
# check that the backup markers have been removed from the restored DB
res = samdb.search(base=ldb.Dn(samdb, "@SAMBA_DSDB"),
scope=ldb.SCOPE_BASE,
attrs=self.backup_markers)
self.assertEqual(len(res), 1)
for marker in self.backup_markers:
self.assertIsNone(res[0].get(marker),
"%s backup-marker left behind" % marker)
# check that the repsFrom and repsTo values have been removed
# from the restored DB
res = samdb.search(base=samdb.get_default_basedn(),
scope=ldb.SCOPE_BASE,
attrs=['repsFrom', 'repsTo'])
self.assertEqual(len(res), 1)
self.assertIsNone(res[0].get('repsFrom'))
self.assertIsNone(res[0].get('repsTo'))
res = samdb.search(base=samdb.get_config_basedn(),
scope=ldb.SCOPE_BASE,
attrs=['repsFrom', 'repsTo'])
self.assertEqual(len(res), 1)
self.assertIsNone(res[0].get('repsFrom'))
self.assertIsNone(res[0].get('repsTo'))
# check the DB is using the backend we supplied
if self.backend:
res = samdb.search(base="@PARTITION", scope=ldb.SCOPE_BASE,
attrs=["backendStore"])
backend = str(res[0].get("backendStore"))
self.assertEqual(backend, self.backend)
# check the restored DB has the expected partitions/DC/FSMO roles
self.assert_partitions_present(samdb)
self.assert_dcs_present(samdb, self.new_server, expected_count=1)
self.assert_fsmo_roles(samdb, self.new_server, self.server)
self.assert_secrets(samdb, expect_secrets=expect_secrets)
# check we still have an uptodateness vector for the original DC
self.assert_repl_uptodate_vector(samdb)
return samdb
def assert_user_secrets(self, samdb, username, expect_secrets):
"""Asserts that a user has/doesn't have secrets as expected"""
basedn = str(samdb.get_default_basedn())
user_dn = "CN=%s,CN=users,%s" % (username, basedn)
if expect_secrets:
self.assertIsNotNone(samdb.searchone("unicodePwd", user_dn))
else:
# the search should throw an exception because the secrets
# attribute isn't actually there
self.assertRaises(KeyError, samdb.searchone, "unicodePwd", user_dn)
def assert_secrets(self, samdb, expect_secrets):
"""Check the user secrets in the restored DB match what's expected"""
# check secrets for the built-in testenv users match what's expected
test_users = ["alice", "bob", "jane"]
for user in test_users:
self.assert_user_secrets(samdb, user, expect_secrets)
def assert_fsmo_roles(self, samdb, server, exclude_server):
"""Asserts the expected server is the FSMO role owner"""
domain_dn = samdb.domain_dn()
forest_dn = dn_from_dns_name(samdb.forest_dns_name())
fsmos = {'infrastructure': "CN=Infrastructure," + domain_dn,
'naming': "CN=Partitions,%s" % samdb.get_config_basedn(),
'schema': str(samdb.get_schema_basedn()),
'rid': "CN=RID Manager$,CN=System," + domain_dn,
'pdc': domain_dn,
'domaindns':
"CN=Infrastructure,DC=DomainDnsZones," + domain_dn,
'forestdns':
"CN=Infrastructure,DC=ForestDnsZones," + forest_dn}
for role, dn in fsmos.items():
owner = get_fsmo_roleowner(samdb, ldb.Dn(samdb, dn), role)
self.assertTrue("CN={0},".format(server) in owner.extended_str(),
"Expected %s to own FSMO role %s" % (server, role))
self.assertTrue("CN={0},".format(exclude_server)
not in owner.extended_str(),
"%s found as FSMO %s role owner" % (server, role))
def cleanup_tempdir(self):
for filename in os.listdir(self.tempdir):
filepath = os.path.join(self.tempdir, filename)
if os.path.isfile(filepath):
os.remove(filepath)
elif os.path.isdir(filepath):
shutil.rmtree(filepath)
def run_cmd(self, args):
"""Executes a samba-tool backup/restore command"""
cmd = " ".join(args)
print("Executing: samba-tool %s" % cmd)
try:
# note: it's important we run the cmd in a separate process here
out = self.check_output("samba-tool " + cmd)
except BlackboxProcessError as e:
# if the command failed, it may have left behind temporary files.
# We're going to fail the test, but first cleanup any temp files so
# that we skip the TestCaseInTempDir._remove_tempdir() assertions
self.cleanup_tempdir()
self.fail("Error calling samba-tool: %s" % e)
print(out)
def create_backup(self, extra_args=None):
"""Runs the backup cmd to produce a backup file for the testenv DC"""
# Run the backup command and check we got one backup tar file
args = self.base_cmd + ["--targetdir=" + self.tempdir]
if extra_args:
args += extra_args
self.run_cmd(args)
# find the filename of the backup-file generated
tar_files = []
for fn in os.listdir(self.tempdir):
if (fn.startswith("samba-backup-") and fn.endswith(".tar.bz2")):
tar_files.append(fn)
self.assertTrue(len(tar_files) == 1,
"Domain backup created %u tar files" % len(tar_files))
# clean up the backup file once the test finishes
backup_file = os.path.join(self.tempdir, tar_files[0])
self.addCleanup(os.remove, backup_file)
return backup_file
def restore_backup(self, backup_file, extra_args=None):
"""Restores the samba directory files from a given backup"""
# Run the restore command
extract_dir = self.restore_dir()
args = ["domain", "backup", "restore", "--backup-file=" + backup_file,
"--targetdir=" + extract_dir,
"--newservername=" + self.new_server]
if extra_args:
args += extra_args
self.run_cmd(args)
# sanity-check the restore doesn't modify the original DC by mistake
self.assert_partitions_present(self.ldb)
self.assert_dcs_present(self.ldb, self.server)
self.assert_fsmo_roles(self.ldb, self.server, self.new_server)
class DomainBackupOnline(DomainBackupBase):
def setUp(self):
super().setUp()
self.base_cmd = ["domain", "backup", "online",
"--server=" + self.server, self.user_auth]
# run the common test cases above using online backups
def test_backup_untar(self):
self._test_backup_untar()
def test_backup_restore(self):
self.use_backend("tdb")
self._test_backup_restore()
def test_backup_restore_with_conf(self):
self.use_backend("mdb")
self._test_backup_restore_with_conf()
def test_backup_restore_no_secrets(self):
self.use_backend("tdb")
self._test_backup_restore_no_secrets()
def test_backup_restore_into_site(self):
self.use_backend("mdb")
self._test_backup_restore_into_site()
class DomainBackupRename(DomainBackupBase):
# run the above test cases using a rename backup
def setUp(self):
super().setUp()
self.new_server = "RENAMESERV"
self.restore_domain = "NEWDOMAIN"
self.restore_realm = "rename.test.net"
self.new_basedn = "DC=rename,DC=test,DC=net"
self.base_cmd = ["domain", "backup", "rename", self.restore_domain,
self.restore_realm, "--server=" + self.server,
self.user_auth]
self.backup_markers += ['backupRename']
# run the common test case code for backup-renames
def test_backup_untar(self):
self._test_backup_untar()
def test_backup_restore(self):
self.use_backend("mdb")
self._test_backup_restore()
def test_backup_restore_with_conf(self):
self.use_backend("tdb")
self._test_backup_restore_with_conf()
def test_backup_restore_no_secrets(self):
self.use_backend("mdb")
self._test_backup_restore_no_secrets()
def test_backup_restore_into_site(self):
self.use_backend("tdb")
self._test_backup_restore_into_site()
def test_backup_invalid_args(self):
"""Checks that rename commands with invalid args are rejected"""
# try a "rename" using the same realm as the DC currently has
rename_cmd = "samba-tool domain backup rename "
bad_cmd = "{cmd} {domain} {realm}".format(cmd=rename_cmd,
domain=self.restore_domain,
realm=os.environ["REALM"])
self.assertRaises(BlackboxProcessError, self.check_output, bad_cmd)
# try a "rename" using the same domain as the DC currently has
bad_cmd = "{cmd} {domain} {realm}".format(cmd=rename_cmd,
domain=os.environ["DOMAIN"],
realm=self.restore_realm)
self.assertRaises(BlackboxProcessError, self.check_output, bad_cmd)
def add_link(self, attr, source, target):
m = ldb.Message()
m.dn = ldb.Dn(self.ldb, source)
m[attr] = ldb.MessageElement(target, ldb.FLAG_MOD_ADD, attr)
self.ldb.modify(m)
def test_one_way_links(self):
"""Sanity-check that a rename handles one-way links correctly"""
# Do some initial setup on the DC before back it up:
# create an OU to hold the test objects we'll create
test_ou = create_test_ou(self.ldb, "rename_test")
self.addCleanup(self.ldb.delete, test_ou, ["tree_delete:1"])
# create the source and target objects and link them together.
# We use addressBookRoots2 here because it's a one-way link
src_dn = "CN=link_src,%s" % test_ou
self.ldb.add({"dn": src_dn,
"objectclass": "msExchConfigurationContainer"})
target_dn = "OU=link_tgt,%s" % test_ou
self.ldb.add({"dn": target_dn, "objectclass": "organizationalunit"})
link_attr = "addressBookRoots2"
self.add_link(link_attr, src_dn, target_dn)
# add a second link target that's in a different partition
server_dn = ("CN=testrename,CN=Servers,CN=Default-First-Site-Name,"
"CN=Sites,%s" % str(self.ldb.get_config_basedn()))
self.ldb.add({"dn": server_dn, "objectclass": "server"})
self.addCleanup(self.ldb.delete, server_dn)
self.add_link(link_attr, src_dn, server_dn)
# do the backup/restore
backup_file = self.create_backup()
self.restore_backup(backup_file)
lp = self.check_restored_smbconf()
restored_ldb = self.check_restored_database(lp)
# work out what the new DNs should be
old_basedn = str(self.ldb.get_default_basedn())
new_target_dn = re.sub(old_basedn + '$', self.new_basedn, target_dn)
new_src_dn = re.sub(old_basedn + '$', self.new_basedn, src_dn)
new_server_dn = re.sub(old_basedn + '$', self.new_basedn, server_dn)
# check the links exist in the renamed DB with the correct DNs
res = restored_ldb.search(base=new_src_dn, scope=ldb.SCOPE_BASE,
attrs=[link_attr])
self.assertEqual(len(res), 1,
"Failed to find renamed link source object")
self.assertTrue(link_attr in res[0], "Missing link attribute")
link_values = [str(x) for x in res[0][link_attr]]
self.assertTrue(new_target_dn in link_values)
self.assertTrue(new_server_dn in link_values)
# extra checks we run on the restored DB in the rename case
def check_restored_database(self, bkp_lp, expect_secrets=True):
# run the common checks over the restored DB
common_test = super()
samdb = common_test.check_restored_database(bkp_lp, expect_secrets)
# check we have actually renamed the DNs
basedn = str(samdb.get_default_basedn())
self.assertEqual(basedn, self.new_basedn)
# check the partition and netBIOS name match the new domain
partitions_dn = samdb.get_partitions_dn()
nc_name = ldb.binary_encode(str(basedn))
res = samdb.search(base=partitions_dn, scope=ldb.SCOPE_ONELEVEL,
attrs=["nETBIOSName", "cn"],
expression='ncName=%s' % nc_name)
self.assertEqual(len(res), 1,
"Looking up partition's NetBIOS name failed")
self.assertEqual(str(res[0].get("nETBIOSName")), self.restore_domain)
self.assertEqual(str(res[0].get("cn")), self.restore_domain)
# check the DC has the correct dnsHostname
realm = self.restore_realm
dn = "CN=%s,OU=Domain Controllers,%s" % (self.new_server,
self.new_basedn)
res = samdb.search(base=dn, scope=ldb.SCOPE_BASE,
attrs=["dNSHostName"])
self.assertEqual(len(res), 1,
"Looking up new DC's dnsHostname failed")
expected_val = "%s.%s" % (self.new_server.lower(), realm)
self.assertEqual(str(res[0].get("dNSHostName")), expected_val)
# check the DNS zones for the new realm are present
dn = "DC=%s,CN=MicrosoftDNS,DC=DomainDnsZones,%s" % (realm, basedn)
res = samdb.search(base=dn, scope=ldb.SCOPE_BASE)
self.assertEqual(len(res), 1, "Lookup of new domain's DNS zone failed")
forestdn = samdb.get_root_basedn().get_linearized()
dn = "DC=_msdcs.%s,CN=MicrosoftDNS,DC=ForestDnsZones,%s" % (realm,
forestdn)
res = samdb.search(base=dn, scope=ldb.SCOPE_BASE)
self.assertEqual(len(res), 1, "Lookup of new domain's DNS zone failed")
return samdb
class DomainBackupOffline(DomainBackupBase):
def setUp(self):
super().setUp()
self.base_cmd = ["domain", "backup", "offline"]
def test_backup_untar(self):
self._test_backup_untar(primary_domain_secrets=1)
def test_backup_restore_with_conf(self):
self._test_backup_restore_with_conf()
def test_backup_restore(self):
self._test_backup_restore()
def test_backup_restore_into_site(self):
self._test_backup_restore_into_site()
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