3 # Samba4 AD database checker
5 # Copyright (C) Andrew Tridgell 2011
6 # Copyright (C) Matthieu Patou <mat@matws.net> 2011
8 # This program is free software; you can redistribute it and/or modify
9 # it under the terms of the GNU General Public License as published by
10 # the Free Software Foundation; either version 3 of the License, or
11 # (at your option) any later version.
13 # This program is distributed in the hope that it will be useful,
14 # but WITHOUT ANY WARRANTY; without even the implied warranty of
15 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 # GNU General Public License for more details.
18 # You should have received a copy of the GNU General Public License
19 # along with this program. If not, see <http://www.gnu.org/licenses/>.
23 from samba import dsdb
24 from samba import common
25 from samba.dcerpc import misc
26 from samba.ndr import ndr_unpack
27 from samba.dcerpc import drsblobs
28 from samba.common import dsdb_Dn
30 class dbcheck(object):
31 """check a SAM database for errors"""
33 def __init__(self, samdb, samdb_schema=None, verbose=False, fix=False, yes=False, quiet=False):
35 self.dict_oid_name = None
36 self.samdb_schema = (samdb_schema or samdb)
37 self.verbose = verbose
41 self.remove_all_unknown_attributes = False
42 self.remove_all_empty_attributes = False
43 self.fix_all_normalisation = False
44 self.fix_all_DN_GUIDs = False
45 self.remove_all_deleted_DN_links = False
46 self.fix_all_target_mismatch = False
47 self.fix_all_metadata = False
48 self.fix_all_missing_backlinks = False
49 self.fix_all_orphaned_backlinks = False
51 def check_database(self, DN=None, scope=ldb.SCOPE_SUBTREE, controls=[], attrs=['*']):
52 '''perform a database check, returning the number of errors found'''
54 res = self.samdb.search(base=DN, scope=scope, attrs=['dn'], controls=controls)
55 self.report('Checking %u objects' % len(res))
59 error_count += self.check_object(object.dn, attrs=attrs)
62 error_count += self.check_rootdse()
64 if error_count != 0 and not self.fix:
65 self.report("Please use --fix to fix these errors")
68 self.report('Checked %u objects (%u errors)' % (len(res), error_count))
73 def report(self, msg):
74 '''print a message unless quiet is set'''
79 ################################################################
80 # a local confirm function that obeys the --fix and --yes options
81 def confirm(self, msg, allow_all=False, forced=False):
82 '''confirm a change'''
89 return common.confirm(msg, forced=forced, allow_all=allow_all)
91 ################################################################
92 # a local confirm function with support for 'all'
93 def confirm_all(self, msg, all_attr):
94 '''confirm a change with support for "all" '''
99 if getattr(self, all_attr) == 'NONE':
101 if getattr(self, all_attr) == 'ALL':
105 c = common.confirm(msg, forced=forced, allow_all=True)
107 setattr(self, all_attr, 'ALL')
110 setattr(self, all_attr, 'NONE')
115 def do_modify(self, m, controls, msg, validate=True):
116 '''perform a modify with optional verbose output'''
118 self.report(self.samdb.write_ldif(m, ldb.CHANGETYPE_MODIFY))
120 self.samdb.modify(m, controls=controls, validate=validate)
121 except Exception, err:
122 self.report("%s : %s" % (msg, err))
127 ################################################################
128 # handle empty attributes
129 def err_empty_attribute(self, dn, attrname):
130 '''fix empty attributes'''
131 self.report("ERROR: Empty attribute %s in %s" % (attrname, dn))
132 if not self.confirm_all('Remove empty attribute %s from %s?' % (attrname, dn), 'remove_all_empty_attributes'):
133 self.report("Not fixing empty attribute %s" % attrname)
138 m[attrname] = ldb.MessageElement('', ldb.FLAG_MOD_DELETE, attrname)
139 if self.do_modify(m, ["relax:0", "show_recycled:1"],
140 "Failed to remove empty attribute %s" % attrname, validate=False):
141 self.report("Removed empty attribute %s" % attrname)
144 ################################################################
145 # handle normalisation mismatches
146 def err_normalise_mismatch(self, dn, attrname, values):
147 '''fix attribute normalisation errors'''
148 self.report("ERROR: Normalisation error for attribute %s in %s" % (attrname, dn))
151 normalised = self.samdb.dsdb_normalise_attributes(self.samdb_schema, attrname, [val])
152 if len(normalised) != 1:
153 self.report("Unable to normalise value '%s'" % val)
154 mod_list.append((val, ''))
155 elif (normalised[0] != val):
156 self.report("value '%s' should be '%s'" % (val, normalised[0]))
157 mod_list.append((val, normalised[0]))
158 if not self.confirm_all('Fix normalisation for %s from %s?' % (attrname, dn), 'fix_all_normalisation'):
159 self.report("Not fixing attribute %s" % attrname)
164 for i in range(0, len(mod_list)):
165 (val, nval) = mod_list[i]
166 m['value_%u' % i] = ldb.MessageElement(val, ldb.FLAG_MOD_DELETE, attrname)
168 m['normv_%u' % i] = ldb.MessageElement(nval, ldb.FLAG_MOD_ADD, attrname)
170 if self.do_modify(m, ["relax:0", "show_recycled:1"],
171 "Failed to normalise attribute %s" % attrname,
173 self.report("Normalised attribute %s" % attrname)
175 def is_deleted_objects_dn(self, dsdb_dn):
176 '''see if a dsdb_Dn is the special Deleted Objects DN'''
177 return dsdb_dn.prefix == "B:32:18E2EA80684F11D2B9AA00C04F79F805:"
180 ################################################################
181 # handle a DN pointing to a deleted object
182 def err_deleted_dn(self, dn, attrname, val, dsdb_dn, correct_dn):
183 self.report("ERROR: target DN is deleted for %s in object %s - %s" % (attrname, dn, val))
184 self.report("Target GUID points at deleted DN %s" % correct_dn)
185 if not self.confirm_all('Remove DN link?', 'remove_all_deleted_DN_links'):
186 self.report("Not removing")
190 m['old_value'] = ldb.MessageElement(val, ldb.FLAG_MOD_DELETE, attrname)
191 if self.do_modify(m, ["show_recycled:1", "local_oid:%s:0" % dsdb.DSDB_CONTROL_DBCHECK],
192 "Failed to remove deleted DN attribute %s" % attrname):
193 self.report("Removed deleted DN on attribute %s" % attrname)
195 ################################################################
196 # handle a missing target DN (both GUID and DN string form are missing)
197 def err_missing_dn_GUID(self, dn, attrname, val, dsdb_dn):
198 # check if its a backlink
199 linkID = self.samdb_schema.get_linkId_from_lDAPDisplayName(attrname)
200 if (linkID & 1 == 0) and str(dsdb_dn).find('DEL\\0A') == -1:
201 self.report("Not removing dangling forward link")
203 self.err_deleted_dn(dn, attrname, val, dsdb_dn, dsdb_dn)
206 ################################################################
207 # handle a missing GUID extended DN component
208 def err_incorrect_dn_GUID(self, dn, attrname, val, dsdb_dn, errstr):
209 self.report("ERROR: %s component for %s in object %s - %s" % (errstr, attrname, dn, val))
210 controls=["extended_dn:1:1", "show_recycled:1"]
212 res = self.samdb.search(base=str(dsdb_dn.dn), scope=ldb.SCOPE_BASE,
213 attrs=[], controls=controls)
214 except ldb.LdbError, (enum, estr):
215 self.report("unable to find object for DN %s - (%s)" % (dsdb_dn.dn, estr))
216 self.err_missing_dn_GUID(dn, attrname, val, dsdb_dn)
219 self.report("unable to find object for DN %s" % dsdb_dn.dn)
220 self.err_missing_dn_GUID(dn, attrname, val, dsdb_dn)
222 dsdb_dn.dn = res[0].dn
224 if not self.confirm_all('Change DN to %s?' % str(dsdb_dn), 'fix_all_DN_GUIDs'):
225 self.report("Not fixing %s" % errstr)
229 m['old_value'] = ldb.MessageElement(val, ldb.FLAG_MOD_DELETE, attrname)
230 m['new_value'] = ldb.MessageElement(str(dsdb_dn), ldb.FLAG_MOD_ADD, attrname)
232 if self.do_modify(m, ["show_recycled:1"],
233 "Failed to fix %s on attribute %s" % (errstr, attrname)):
234 self.report("Fixed %s on attribute %s" % (errstr, attrname))
237 ################################################################
238 # handle a DN string being incorrect
239 def err_dn_target_mismatch(self, dn, attrname, val, dsdb_dn, correct_dn, errstr):
240 self.report("ERROR: incorrect DN string component for %s in object %s - %s" % (attrname, dn, val))
241 dsdb_dn.dn = correct_dn
243 if not self.confirm_all('Change DN to %s?' % str(dsdb_dn), 'fix_all_target_mismatch'):
244 self.report("Not fixing %s" % errstr)
248 m['old_value'] = ldb.MessageElement(val, ldb.FLAG_MOD_DELETE, attrname)
249 m['new_value'] = ldb.MessageElement(str(dsdb_dn), ldb.FLAG_MOD_ADD, attrname)
250 if self.do_modify(m, ["show_recycled:1"],
251 "Failed to fix incorrect DN string on attribute %s" % attrname):
252 self.report("Fixed incorrect DN string on attribute %s" % (attrname))
254 ################################################################
255 # handle an unknown attribute error
256 def err_unknown_attribute(self, obj, attrname):
257 '''handle an unknown attribute error'''
258 self.report("ERROR: unknown attribute '%s' in %s" % (attrname, obj.dn))
259 if not self.confirm_all('Remove unknown attribute %s' % attrname, 'remove_all_unknown_attributes'):
260 self.report("Not removing %s" % attrname)
264 m['old_value'] = ldb.MessageElement([], ldb.FLAG_MOD_DELETE, attrname)
265 if self.do_modify(m, ["relax:0", "show_recycled:1"],
266 "Failed to remove unknown attribute %s" % attrname):
267 self.report("Removed unknown attribute %s" % (attrname))
270 ################################################################
271 # handle a missing backlink
272 def err_missing_backlink(self, obj, attrname, val, backlink_name, target_dn):
273 '''handle a missing backlink value'''
274 self.report("ERROR: missing backlink attribute '%s' in %s for link %s in %s" % (backlink_name, target_dn, attrname, obj.dn))
275 if not self.confirm_all('Fix missing backlink %s' % backlink_name, 'fix_all_missing_backlinks'):
276 self.report("Not fixing missing backlink %s" % backlink_name)
280 m['old_value'] = ldb.MessageElement(val, ldb.FLAG_MOD_DELETE, attrname)
281 m['new_value'] = ldb.MessageElement(val, ldb.FLAG_MOD_ADD, attrname)
282 if self.do_modify(m, ["show_recycled:1"],
283 "Failed to fix missing backlink %s" % backlink_name):
284 self.report("Fixed missing backlink %s" % (backlink_name))
287 ################################################################
288 # handle a orphaned backlink
289 def err_orphaned_backlink(self, obj, attrname, val, link_name, target_dn):
290 '''handle a orphaned backlink value'''
291 self.report("ERROR: orphaned backlink attribute '%s' in %s for link %s in %s" % (attrname, obj.dn, link_name, target_dn))
292 if not self.confirm_all('Remove orphaned backlink %s' % link_name, 'fix_all_orphaned_backlinks'):
293 self.report("Not removing orphaned backlink %s" % link_name)
297 m['value'] = ldb.MessageElement(val, ldb.FLAG_MOD_DELETE, attrname)
298 if self.do_modify(m, ["show_recycled:1", "relax:0"],
299 "Failed to fix orphaned backlink %s" % link_name):
300 self.report("Fixed orphaned backlink %s" % (link_name))
303 ################################################################
304 # specialised checking for a dn attribute
305 def check_dn(self, obj, attrname, syntax_oid):
306 '''check a DN attribute for correctness'''
308 for val in obj[attrname]:
309 dsdb_dn = dsdb_Dn(self.samdb, val, syntax_oid)
311 # all DNs should have a GUID component
312 guid = dsdb_dn.dn.get_extended_component("GUID")
315 self.err_incorrect_dn_GUID(obj.dn, attrname, val, dsdb_dn, "missing GUID")
318 guidstr = str(misc.GUID(guid))
321 linkID = self.samdb_schema.get_linkId_from_lDAPDisplayName(attrname)
322 reverse_link_name = self.samdb_schema.get_backlink_from_lDAPDisplayName(attrname)
323 if reverse_link_name is not None:
324 attrs.append(reverse_link_name)
326 # check its the right GUID
328 res = self.samdb.search(base="<GUID=%s>" % guidstr, scope=ldb.SCOPE_BASE,
329 attrs=attrs, controls=["extended_dn:1:1", "show_recycled:1"])
330 except ldb.LdbError, (enum, estr):
332 self.err_incorrect_dn_GUID(obj.dn, attrname, val, dsdb_dn, "incorrect GUID")
335 # now we have two cases - the source object might or might not be deleted
336 is_deleted = 'isDeleted' in obj and obj['isDeleted'][0].upper() == 'TRUE'
337 target_is_deleted = 'isDeleted' in res[0] and res[0]['isDeleted'][0].upper() == 'TRUE'
339 # the target DN is not allowed to be deleted, unless the target DN is the
340 # special Deleted Objects container
341 if target_is_deleted and not is_deleted and not self.is_deleted_objects_dn(dsdb_dn):
343 self.err_deleted_dn(obj.dn, attrname, val, dsdb_dn, res[0].dn)
346 # check the DN matches in string form
347 if res[0].dn.extended_str() != dsdb_dn.dn.extended_str():
349 self.err_dn_target_mismatch(obj.dn, attrname, val, dsdb_dn,
350 res[0].dn, "incorrect string version of DN")
353 # check the reverse_link is correct if there should be one
354 if reverse_link_name is not None:
356 if reverse_link_name in res[0]:
357 for v in res[0][reverse_link_name]:
358 if v == obj.dn.extended_str():
363 self.err_orphaned_backlink(obj, attrname, val, reverse_link_name, dsdb_dn.dn)
365 self.err_missing_backlink(obj, attrname, val, reverse_link_name, dsdb_dn.dn)
371 def process_metadata(self, val):
372 '''Read metadata properties and list attributes in it'''
376 repl = ndr_unpack(drsblobs.replPropertyMetaDataBlob, str(val))
379 for o in repl.ctr.array:
380 att = self.samdb_schema.get_lDAPDisplayName_by_attid(o.attid)
381 list_att.append(att.lower())
386 def fix_metadata(self, dn, attr):
387 '''re-write replPropertyMetaData elements for a single attribute for a
388 object. This is used to fix missing replPropertyMetaData elements'''
389 res = self.samdb.search(base = dn, scope=ldb.SCOPE_BASE, attrs = [attr],
390 controls = ["search_options:1:2", "show_recycled:1"])
394 nmsg[attr] = ldb.MessageElement(msg[attr], ldb.FLAG_MOD_REPLACE, attr)
395 if self.do_modify(nmsg, ["relax:0", "provision:0", "show_recycled:1"],
396 "Failed to fix metadata for attribute %s" % attr):
397 self.report("Fixed metadata for attribute %s" % attr)
400 ################################################################
401 # check one object - calls to individual error handlers above
402 def check_object(self, dn, attrs=['*']):
403 '''check one object'''
405 self.report("Checking object %s" % dn)
407 attrs.append("replPropertyMetaData")
409 res = self.samdb.search(base=dn, scope=ldb.SCOPE_BASE,
410 controls=["extended_dn:1:1", "show_recycled:1"],
413 self.report("Object %s disappeared during check" % dn)
417 list_attrs_from_md = []
419 got_repl_property_meta_data = False
425 if str(attrname).lower() == 'replpropertymetadata':
426 list_attrs_from_md = self.process_metadata(obj[attrname])
427 got_repl_property_meta_data = True
431 # check for empty attributes
432 for val in obj[attrname]:
434 self.err_empty_attribute(dn, attrname)
438 # get the syntax oid for the attribute, so we can can have
439 # special handling for some specific attribute types
441 syntax_oid = self.samdb_schema.get_syntax_oid_from_lDAPDisplayName(attrname)
442 except Exception, msg:
443 self.err_unknown_attribute(obj, attrname)
447 flag = self.samdb_schema.get_systemFlags_from_lDAPDisplayName(attrname)
448 if (not flag & dsdb.DS_FLAG_ATTR_NOT_REPLICATED
449 and not flag & dsdb.DS_FLAG_ATTR_IS_CONSTRUCTED
450 and not self.samdb_schema.get_linkId_from_lDAPDisplayName(attrname)):
451 list_attrs_seen.append(str(attrname).lower())
453 if syntax_oid in [ dsdb.DSDB_SYNTAX_BINARY_DN, dsdb.DSDB_SYNTAX_OR_NAME,
454 dsdb.DSDB_SYNTAX_STRING_DN, ldb.SYNTAX_DN ]:
455 # it's some form of DN, do specialised checking on those
456 error_count += self.check_dn(obj, attrname, syntax_oid)
458 # check for incorrectly normalised attributes
459 for val in obj[attrname]:
460 normalised = self.samdb.dsdb_normalise_attributes(self.samdb_schema, attrname, [val])
461 if len(normalised) != 1 or normalised[0] != val:
462 self.err_normalise_mismatch(dn, attrname, obj[attrname])
467 if got_repl_property_meta_data:
468 for att in list_attrs_seen:
469 if not att in list_attrs_from_md:
471 self.report("On object %s" % dn)
474 self.report("ERROR: Attribute %s not present in replication metadata" % att)
475 if not self.confirm_all("Fix missing replPropertyMetaData element '%s'" % att, 'fix_all_metadata'):
476 self.report("Not fixing missing replPropertyMetaData element '%s'" % att)
478 self.fix_metadata(dn, att)
482 ################################################################
483 # check special @ROOTDSE attributes
484 def check_rootdse(self):
485 '''check the @ROOTDSE special object'''
486 dn = ldb.Dn(self.samdb, '@ROOTDSE')
488 self.report("Checking object %s" % dn)
489 res = self.samdb.search(base=dn, scope=ldb.SCOPE_BASE)
491 self.report("Object %s disappeared during check" % dn)
496 # check that the dsServiceName is in GUID form
497 if not 'dsServiceName' in obj:
498 self.report('ERROR: dsServiceName missing in @ROOTDSE')
501 if not obj['dsServiceName'][0].startswith('<GUID='):
502 self.report('ERROR: dsServiceName not in GUID form in @ROOTDSE')
504 if not self.confirm('Change dsServiceName to GUID form?'):
506 res = self.samdb.search(base=ldb.Dn(self.samdb, obj['dsServiceName'][0]),
507 scope=ldb.SCOPE_BASE, attrs=['objectGUID'])
508 guid_str = str(ndr_unpack(misc.GUID, res[0]['objectGUID'][0]))
511 m['dsServiceName'] = ldb.MessageElement("<GUID=%s>" % guid_str,
512 ldb.FLAG_MOD_REPLACE, 'dsServiceName')
513 if self.do_modify(m, [], "Failed to change dsServiceName to GUID form", validate=False):
514 self.report("Changed dsServiceName to GUID form")
518 ###############################################
519 # re-index the database
520 def reindex_database(self):
521 '''re-index the whole database'''
523 m.dn = ldb.Dn(self.samdb, "@ATTRIBUTES")
524 m['add'] = ldb.MessageElement('NONE', ldb.FLAG_MOD_ADD, 'force_reindex')
525 m['delete'] = ldb.MessageElement('NONE', ldb.FLAG_MOD_DELETE, 'force_reindex')
526 return self.do_modify(m, [], 're-indexed database', validate=False)