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
30 class dsdb_DN(object):
31 '''a class to manipulate DN components'''
33 def __init__(self, samdb, dnstring, syntax_oid):
34 if syntax_oid in [ dsdb.DSDB_SYNTAX_BINARY_DN, dsdb.DSDB_SYNTAX_STRING_DN ]:
35 colons = dnstring.split(':')
37 raise Exception("invalid DN prefix")
38 prefix_len = 4 + len(colons[1]) + int(colons[1])
39 self.prefix = dnstring[0:prefix_len]
40 self.dnstring = dnstring[prefix_len:]
42 self.dnstring = dnstring
45 self.dn = ldb.Dn(samdb, self.dnstring)
46 except Exception, msg:
47 print("ERROR: bad DN string '%s'" % self.dnstring)
51 return self.prefix + str(self.dn.extended_str(mode=1))
53 class dbcheck(object):
54 """check a SAM database for errors"""
56 def __init__(self, samdb, samdb_schema=None, verbose=False, fix=False, yes=False, quiet=False):
58 self.dict_oid_name = None
59 self.samdb_schema = (samdb_schema or samdb)
60 self.verbose = verbose
64 self.remove_all_unknown_attributes = False
65 self.remove_all_empty_attributes = False
66 self.fix_all_normalisation = False
67 self.fix_all_DN_GUIDs = False
68 self.remove_all_deleted_DN_links = False
69 self.fix_all_target_mismatch = False
70 self.fix_all_metadata = False
71 self.fix_all_missing_backlinks = False
72 self.fix_all_orphaned_backlinks = False
74 def check_database(self, DN=None, scope=ldb.SCOPE_SUBTREE, controls=[], attrs=['*']):
75 '''perform a database check, returning the number of errors found'''
77 res = self.samdb.search(base=DN, scope=scope, attrs=['dn'], controls=controls)
78 self.report('Checking %u objects' % len(res))
81 error_count += self.check_object(object.dn, attrs=attrs)
82 if error_count != 0 and not self.fix:
83 self.report("Please use --fix to fix these errors")
84 self.report('Checked %u objects (%u errors)' % (len(res), error_count))
89 def report(self, msg):
90 '''print a message unless quiet is set'''
95 ################################################################
96 # a local confirm function that obeys the --fix and --yes options
97 def confirm(self, msg, allow_all=False, forced=False):
98 '''confirm a change'''
105 return common.confirm(msg, forced=forced, allow_all=allow_all)
107 ################################################################
108 # a local confirm function with support for 'all'
109 def confirm_all(self, msg, all_attr):
110 '''confirm a change with support for "all" '''
115 if getattr(self, all_attr) == 'NONE':
117 if getattr(self, all_attr) == 'ALL':
121 c = common.confirm(msg, forced=forced, allow_all=True)
123 setattr(self, all_attr, 'ALL')
126 setattr(self, all_attr, 'NONE')
131 def do_modify(self, m, controls, msg, validate=True):
132 '''perform a modify with optional verbose output'''
134 self.report(self.samdb.write_ldif(m, ldb.CHANGETYPE_MODIFY))
136 self.samdb.modify(m, controls=controls, validate=validate)
137 except Exception, err:
138 self.report("%s : %s" % (msg, err))
143 ################################################################
144 # handle empty attributes
145 def err_empty_attribute(self, dn, attrname):
146 '''fix empty attributes'''
147 self.report("ERROR: Empty attribute %s in %s" % (attrname, dn))
148 if not self.confirm_all('Remove empty attribute %s from %s?' % (attrname, dn), 'remove_all_empty_attributes'):
149 self.report("Not fixing empty attribute %s" % attrname)
154 m[attrname] = ldb.MessageElement('', ldb.FLAG_MOD_DELETE, attrname)
155 if self.do_modify(m, ["relax:0", "show_deleted:1"],
156 "Failed to remove empty attribute %s" % attrname, validate=False):
157 self.report("Removed empty attribute %s" % attrname)
160 ################################################################
161 # handle normalisation mismatches
162 def err_normalise_mismatch(self, dn, attrname, values):
163 '''fix attribute normalisation errors'''
164 self.report("ERROR: Normalisation error for attribute %s in %s" % (attrname, dn))
167 normalised = self.samdb.dsdb_normalise_attributes(self.samdb_schema, attrname, [val])
168 if len(normalised) != 1:
169 self.report("Unable to normalise value '%s'" % val)
170 mod_list.append((val, ''))
171 elif (normalised[0] != val):
172 self.report("value '%s' should be '%s'" % (val, normalised[0]))
173 mod_list.append((val, normalised[0]))
174 if not self.confirm_all('Fix normalisation for %s from %s?' % (attrname, dn), 'fix_all_normalisation'):
175 self.report("Not fixing attribute %s" % attrname)
180 for i in range(0, len(mod_list)):
181 (val, nval) = mod_list[i]
182 m['value_%u' % i] = ldb.MessageElement(val, ldb.FLAG_MOD_DELETE, attrname)
184 m['normv_%u' % i] = ldb.MessageElement(nval, ldb.FLAG_MOD_ADD, attrname)
186 if self.do_modify(m, ["relax:0", "show_deleted:1"],
187 "Failed to normalise attribute %s" % attrname,
189 self.report("Normalised attribute %s" % attrname)
191 def is_deleted_objects_dn(self, dsdb_dn):
192 '''see if a dsdb_DN is the special Deleted Objects DN'''
193 return dsdb_dn.prefix == "B:32:18E2EA80684F11D2B9AA00C04F79F805:"
196 ################################################################
197 # handle a missing GUID extended DN component
198 def err_incorrect_dn_GUID(self, dn, attrname, val, dsdb_dn, errstr):
199 self.report("ERROR: %s component for %s in object %s - %s" % (errstr, attrname, dn, val))
200 controls=["extended_dn:1:1", "show_deleted:1"]
202 res = self.samdb.search(base=str(dsdb_dn.dn), scope=ldb.SCOPE_BASE,
203 attrs=[], controls=controls)
204 except ldb.LdbError, (enum, estr):
205 self.report("unable to find object for DN %s - cannot fix (%s)" % (dsdb_dn.dn, estr))
207 dsdb_dn.dn = res[0].dn
209 if not self.confirm_all('Change DN to %s?' % str(dsdb_dn), 'fix_all_DN_GUIDs'):
210 self.report("Not fixing %s" % errstr)
214 m['old_value'] = ldb.MessageElement(val, ldb.FLAG_MOD_DELETE, attrname)
215 m['new_value'] = ldb.MessageElement(str(dsdb_dn), ldb.FLAG_MOD_ADD, attrname)
217 if self.do_modify(m, ["show_deleted:1"],
218 "Failed to fix %s on attribute %s" % (errstr, attrname)):
219 self.report("Fixed %s on attribute %s" % (errstr, attrname))
222 ################################################################
223 # handle a DN pointing to a deleted object
224 def err_deleted_dn(self, dn, attrname, val, dsdb_dn, correct_dn):
225 self.report("ERROR: target DN is deleted for %s in object %s - %s" % (attrname, dn, val))
226 self.report("Target GUID points at deleted DN %s" % correct_dn)
227 if not self.confirm_all('Remove DN?', 'remove_all_deleted_DN_links'):
228 self.report("Not removing")
232 m['old_value'] = ldb.MessageElement(val, ldb.FLAG_MOD_DELETE, attrname)
233 if self.do_modify(m, ["show_deleted:1"],
234 "Failed to remove deleted DN attribute %s" % attrname):
235 self.report("Removed deleted DN on attribute %s" % attrname)
238 ################################################################
239 # handle a DN string being incorrect
240 def err_dn_target_mismatch(self, dn, attrname, val, dsdb_dn, correct_dn, errstr):
241 self.report("ERROR: incorrect DN string component for %s in object %s - %s" % (attrname, dn, val))
242 dsdb_dn.dn = correct_dn
244 if not self.confirm_all('Change DN to %s?' % str(dsdb_dn), 'fix_all_target_mismatch'):
245 self.report("Not fixing %s" % errstr)
249 m['old_value'] = ldb.MessageElement(val, ldb.FLAG_MOD_DELETE, attrname)
250 m['new_value'] = ldb.MessageElement(str(dsdb_dn), ldb.FLAG_MOD_ADD, attrname)
251 if self.do_modify(m, ["show_deleted:1"],
252 "Failed to fix incorrect DN string on attribute %s" % attrname):
253 self.report("Fixed incorrect DN string on attribute %s" % (attrname))
255 ################################################################
256 # handle an unknown attribute error
257 def err_unknown_attribute(self, obj, attrname):
258 '''handle an unknown attribute error'''
259 self.report("ERROR: unknown attribute '%s' in %s" % (attrname, obj.dn))
260 if not self.confirm_all('Remove unknown attribute %s' % attrname, 'remove_all_unknown_attributes'):
261 self.report("Not removing %s" % attrname)
265 m['old_value'] = ldb.MessageElement([], ldb.FLAG_MOD_DELETE, attrname)
266 if self.do_modify(m, ["relax:0", "show_deleted:1"],
267 "Failed to remove unknown attribute %s" % attrname):
268 self.report("Removed unknown attribute %s" % (attrname))
271 ################################################################
272 # handle a missing backlink
273 def err_missing_backlink(self, obj, attrname, val, backlink_name, target_dn):
274 '''handle a missing backlink value'''
275 self.report("ERROR: missing backlink attribute '%s' in %s for link %s in %s" % (backlink_name, target_dn, attrname, obj.dn))
276 if not self.confirm_all('Fix missing backlink %s' % backlink_name, 'fix_all_missing_backlinks'):
277 self.report("Not fixing missing backlink %s" % backlink_name)
281 m['old_value'] = ldb.MessageElement(val, ldb.FLAG_MOD_DELETE, attrname)
282 m['new_value'] = ldb.MessageElement(val, ldb.FLAG_MOD_ADD, attrname)
283 if self.do_modify(m, ["show_deleted:1"],
284 "Failed to fix missing backlink %s" % backlink_name):
285 self.report("Fixed missing backlink %s" % (backlink_name))
288 ################################################################
289 # handle a orphaned backlink
290 def err_orphaned_backlink(self, obj, attrname, val, link_name, target_dn):
291 '''handle a orphaned backlink value'''
292 self.report("ERROR: orphaned backlink attribute '%s' in %s for link %s in %s" % (attrname, obj.dn, link_name, target_dn))
293 if not self.confirm_all('Remove orphaned backlink %s' % link_name, 'fix_all_orphaned_backlinks'):
294 self.report("Not removing orphaned backlink %s" % link_name)
298 m['value'] = ldb.MessageElement(val, ldb.FLAG_MOD_DELETE, attrname)
299 if self.do_modify(m, ["show_deleted:1", "relax:0"],
300 "Failed to fix orphaned backlink %s" % link_name):
301 self.report("Fixed orphaned backlink %s" % (link_name))
304 ################################################################
305 # specialised checking for a dn attribute
306 def check_dn(self, obj, attrname, syntax_oid):
307 '''check a DN attribute for correctness'''
309 for val in obj[attrname]:
310 dsdb_dn = dsdb_DN(self.samdb, val, syntax_oid)
312 # all DNs should have a GUID component
313 guid = dsdb_dn.dn.get_extended_component("GUID")
316 self.err_incorrect_dn_GUID(obj.dn, attrname, val, dsdb_dn, "missing GUID")
319 guidstr = str(misc.GUID(guid))
322 linkkID = self.samdb_schema.get_linkId_from_lDAPDisplayName(attrname)
323 reverse_link_name = self.samdb.get_backlink_from_lDAPDisplayName(attrname)
324 if reverse_link_name is not None:
325 attrs.append(reverse_link_name)
327 # check its the right GUID
329 res = self.samdb.search(base="<GUID=%s>" % guidstr, scope=ldb.SCOPE_BASE,
330 attrs=attrs, controls=["extended_dn:1:1", "show_deleted:1"])
331 except ldb.LdbError, (enum, estr):
333 self.err_incorrect_dn_GUID(obj.dn, attrname, val, dsdb_dn, "incorrect GUID")
336 # now we have two cases - the source object might or might not be deleted
337 is_deleted = 'isDeleted' in obj and obj['isDeleted'][0].upper() == 'TRUE'
338 target_is_deleted = 'isDeleted' in res[0] and res[0]['isDeleted'][0].upper() == 'TRUE'
340 # the target DN is not allowed to be deleted, unless the target DN is the
341 # special Deleted Objects container
342 if target_is_deleted and not is_deleted and not self.is_deleted_objects_dn(dsdb_dn):
344 self.err_deleted_dn(obj.dn, attrname, val, dsdb_dn, res[0].dn)
347 # check the DN matches in string form
348 if res[0].dn.extended_str() != dsdb_dn.dn.extended_str():
350 self.err_dn_target_mismatch(obj.dn, attrname, val, dsdb_dn,
351 res[0].dn, "incorrect string version of DN")
354 # check the reverse_link is correct if there should be one
355 if reverse_link_name is not None:
357 if reverse_link_name in res[0]:
358 for v in res[0][reverse_link_name]:
359 if v == obj.dn.extended_str():
364 self.err_orphaned_backlink(obj, attrname, val, reverse_link_name, dsdb_dn.dn)
366 self.err_missing_backlink(obj, attrname, val, reverse_link_name, dsdb_dn.dn)
372 def process_metadata(self, val):
373 '''Read metadata properties and list attributes in it'''
377 repl = ndr_unpack(drsblobs.replPropertyMetaDataBlob, str(val))
380 for o in repl.ctr.array:
381 att = self.samdb_schema.get_lDAPDisplayName_by_attid(o.attid)
382 list_att.append(att.lower())
387 def fix_metadata(self, dn, attr):
388 '''re-write replPropertyMetaData elements for a single attribute for a
389 object. This is used to fix missing replPropertyMetaData elements'''
390 res = self.samdb.search(base = dn, scope=ldb.SCOPE_BASE, attrs = [attr],
391 controls = ["search_options:1:2", "show_deleted:1"])
395 nmsg[attr] = ldb.MessageElement(msg[attr], ldb.FLAG_MOD_REPLACE, attr)
396 if self.do_modify(nmsg, ["relax:0", "provision:0", "show_deleted:1"],
397 "Failed to fix metadata for attribute %s" % attr):
398 self.report("Fixed metadata for attribute %s" % attr)
401 ################################################################
402 # check one object - calls to individual error handlers above
403 def check_object(self, dn, attrs=['*']):
404 '''check one object'''
406 self.report("Checking object %s" % dn)
408 attrs.append("replPropertyMetaData")
410 res = self.samdb.search(base=dn, scope=ldb.SCOPE_BASE,
411 controls=["extended_dn:1:1", "show_deleted:1"],
414 self.report("Object %s disappeared during check" % dn)
418 list_attrs_from_md = []
425 if str(attrname).lower() == 'replpropertymetadata':
426 list_attrs_from_md = self.process_metadata(obj[attrname])
430 # check for empty attributes
431 for val in obj[attrname]:
433 self.err_empty_attribute(dn, attrname)
437 # get the syntax oid for the attribute, so we can can have
438 # special handling for some specific attribute types
440 syntax_oid = self.samdb_schema.get_syntax_oid_from_lDAPDisplayName(attrname)
441 except Exception, msg:
442 self.err_unknown_attribute(obj, attrname)
446 flag = self.samdb_schema.get_systemFlags_from_lDAPDisplayName(attrname)
447 if (not flag & dsdb.DS_FLAG_ATTR_NOT_REPLICATED
448 and not flag & dsdb.DS_FLAG_ATTR_IS_CONSTRUCTED
449 and not self.samdb_schema.get_linkId_from_lDAPDisplayName(attrname)):
450 list_attrs_seen.append(str(attrname).lower())
452 if syntax_oid in [ dsdb.DSDB_SYNTAX_BINARY_DN, dsdb.DSDB_SYNTAX_OR_NAME,
453 dsdb.DSDB_SYNTAX_STRING_DN, ldb.LDB_SYNTAX_DN ]:
454 # it's some form of DN, do specialised checking on those
455 error_count += self.check_dn(obj, attrname, syntax_oid)
457 # check for incorrectly normalised attributes
458 for val in obj[attrname]:
459 normalised = self.samdb.dsdb_normalise_attributes(self.samdb_schema, attrname, [val])
460 if len(normalised) != 1 or normalised[0] != val:
461 self.err_normalise_mismatch(dn, attrname, obj[attrname])
466 for att in list_attrs_seen:
467 if not att in list_attrs_from_md:
469 self.report("On object %s" % dn)
472 self.report("ERROR: Attribute %s not present in replication metadata" % att)
473 if not self.confirm_all("Fix missing replPropertyMetaData element '%s'" % att, 'fix_all_metadata'):
474 self.report("Not fixing missing replPropertyMetaData element '%s'" % att)
476 self.fix_metadata(dn, att)
480 ###############################################
481 # re-index the database
482 def reindex_database(self):
483 '''re-index the whole database'''
485 m.dn = ldb.Dn(self.samdb, "@ATTRIBUTES")
486 m['add'] = ldb.MessageElement('NONE', ldb.FLAG_MOD_ADD, 'force_reindex')
487 m['delete'] = ldb.MessageElement('NONE', ldb.FLAG_MOD_DELETE, 'force_reindex')
488 return self.do_modify(m, [], 're-indexed database', validate=False)