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#!/usr/bin/env python
#
# Samba4 AD database checker
#
# Copyright (C) Andrew Tridgell 2011
#
# 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 ldb, sys
import samba.getopt as options
from samba.common import confirm
from samba.auth import system_session
from samba.samdb import SamDB
from samba.netcmd import (
Command,
CommandError,
Option
)
class cmd_dbcheck(Command):
"""check local AD database for errors"""
synopsis = "dbcheck <DN> [options]"
takes_optiongroups = {
"sambaopts": options.SambaOptions,
"versionopts": options.VersionOptions,
"credopts": options.CredentialsOptionsDouble,
}
takes_args = ["DN?"]
takes_options = [
Option("--scope", dest="scope", default="SUB",
help="Pass search scope that builds DN list. Options: SUB, ONE, BASE"),
Option("--fix", dest="fix", default=False, action='store_true',
help='Fix any errors found'),
Option("--yes", dest="yes", default=False, action='store_true',
help="don't confirm changes, just do them all"),
Option("--cross-ncs", dest="cross_ncs", default=False, action='store_true',
help="cross naming context boundaries"),
Option("-v", "--verbose", dest="verbose", action="store_true", default=False,
help="Print more details of checking"),
]
def run(self, DN=None, verbose=False, fix=False, yes=False, cross_ncs=False,
scope="SUB", credopts=None, sambaopts=None, versionopts=None):
self.lp = sambaopts.get_loadparm()
self.creds = credopts.get_credentials(self.lp, fallback_machine=True)
self.samdb = SamDB(session_info=system_session(), url=None,
credentials=self.creds, lp=self.lp)
self.verbose = verbose
self.fix = fix
self.yes = yes
scope_map = { "SUB": ldb.SCOPE_SUBTREE, "BASE":ldb.SCOPE_BASE, "ONE":ldb.SCOPE_ONELEVEL }
scope = scope.upper()
if not scope in scope_map:
raise CommandError("Unknown scope %s" % scope)
self.search_scope = scope_map[scope]
controls = []
if cross_ncs:
controls.append("search_options:1:2")
res = self.samdb.search(base=DN, scope=self.search_scope, attrs=['dn'], controls=controls)
print('Checking %u objects' % len(res))
error_count = 0
for object in res:
error_count += self.check_object(object.dn)
if error_count != 0 and not self.fix:
print("Please use --fix to fix these errors")
print('Checked %u objects (%u errors)' % (len(res), error_count))
if error_count != 0:
sys.exit(1)
################################################################
# handle empty attributes
def empty_attribute(self, dn, attrname):
'''fix empty attributes'''
print("ERROR: Empty attribute %s in %s" % (attrname, dn))
if not self.fix:
return
if not confirm('Remove empty attribute %s from %s?' % (attrname, dn), self.yes):
print("Not fixing empty attribute %s" % attrname)
return
m = ldb.Message()
m.dn = dn
m[attrname] = ldb.MessageElement('', ldb.FLAG_MOD_DELETE, attrname)
try:
self.samdb.modify(m, controls=["relax:0"], validate=False)
except Exception, msg:
print("Failed to remove empty attribute %s : %s" % (attrname, msg))
return
print("Removed empty attribute %s" % attrname)
################################################################
# handle normalisation mismatches
def normalise_mismatch(self, dn, attrname, values):
'''fix attribute normalisation errors'''
print("ERROR: Normalisation error for attribute %s in %s" % (attrname, dn))
mod_list = []
for val in values:
normalised = self.samdb.dsdb_normalise_attributes(self.samdb, attrname, [val])
if len(normalised) != 1:
print("Unable to normalise value '%s'" % val)
mod_list.append((val, ''))
elif (normalised[0] != val):
print("value '%s' should be '%s'" % (val, normalised[0]))
mod_list.append((val, normalised[0]))
if not self.fix:
return
if not confirm('Fix normalisation for %s from %s?' % (attrname, dn), self.yes):
print("Not fixing attribute %s" % attrname)
return
m = ldb.Message()
m.dn = dn
for i in range(0, len(mod_list)):
(val, nval) = mod_list[i]
m['value_%u' % i] = ldb.MessageElement(val, ldb.FLAG_MOD_DELETE, attrname)
if nval != '':
m['normv_%u' % i] = ldb.MessageElement(nval, ldb.FLAG_MOD_ADD, attrname)
try:
self.samdb.modify(m, controls=["relax:0"], validate=False)
except Exception, msg:
print("Failed to normalise attribute %s : %s" % (attrname, msg))
return
print("Normalised attribute %s" % attrname)
################################################################
# check one object - calls to individual error handlers above
def check_object(self, dn):
'''check one object'''
if self.verbose:
print("Checking object %s" % dn)
res = self.samdb.search(base=dn, scope=ldb.SCOPE_BASE, controls=["extended_dn:1:1"], attrs=['*', 'ntSecurityDescriptor'])
if len(res) != 1:
print("Object %s disappeared during check" % dn)
return 1
obj = res[0]
error_count = 0
for attrname in obj:
if attrname == 'dn':
continue
# check for empty attributes
for val in obj[attrname]:
if val == '':
self.empty_attribute(dn, attrname)
error_count += 1
continue
# check for incorrectly normalised attributes
for val in obj[attrname]:
normalised = self.samdb.dsdb_normalise_attributes(self.samdb, attrname, [val])
if len(normalised) != 1 or normalised[0] != val:
self.normalise_mismatch(dn, attrname, obj[attrname])
error_count += 1
break
return error_count
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