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
72 def check_database(self, DN=None, scope=ldb.SCOPE_SUBTREE, controls=[], attrs=['*']):
73 '''perform a database check, returning the number of errors found'''
75 res = self.samdb.search(base=DN, scope=scope, attrs=['dn'], controls=controls)
76 self.report('Checking %u objects' % len(res))
79 error_count += self.check_object(object.dn, attrs=attrs)
80 if error_count != 0 and not self.fix:
81 self.report("Please use --fix to fix these errors")
82 self.report('Checked %u objects (%u errors)' % (len(res), error_count))
87 def report(self, msg):
88 '''print a message unless quiet is set'''
93 ################################################################
94 # a local confirm function that obeys the --fix and --yes options
95 def confirm(self, msg, allow_all=False, forced=False):
96 '''confirm a change'''
103 return common.confirm(msg, forced=forced, allow_all=allow_all)
105 ################################################################
106 # a local confirm function with support for 'all'
107 def confirm_all(self, msg, all_attr):
108 '''confirm a change with support for "all" '''
113 if getattr(self, all_attr) == 'NONE':
115 if getattr(self, all_attr) == 'ALL':
119 c = common.confirm(msg, forced=forced, allow_all=True)
121 setattr(self, all_attr, 'ALL')
124 setattr(self, all_attr, 'NONE')
129 ################################################################
130 # handle empty attributes
131 def err_empty_attribute(self, dn, attrname):
132 '''fix empty attributes'''
133 self.report("ERROR: Empty attribute %s in %s" % (attrname, dn))
134 if not self.confirm_all('Remove empty attribute %s from %s?' % (attrname, dn), 'remove_all_empty_attributes'):
135 self.report("Not fixing empty attribute %s" % attrname)
140 m[attrname] = ldb.MessageElement('', ldb.FLAG_MOD_DELETE, attrname)
142 self.report(self.samdb.write_ldif(m, ldb.CHANGETYPE_MODIFY))
144 self.samdb.modify(m, controls=["relax:0", "show_deleted:1"], validate=False)
145 except Exception, msg:
146 self.report("Failed to remove empty attribute %s : %s" % (attrname, msg))
148 self.report("Removed empty attribute %s" % attrname)
151 ################################################################
152 # handle normalisation mismatches
153 def err_normalise_mismatch(self, dn, attrname, values):
154 '''fix attribute normalisation errors'''
155 self.report("ERROR: Normalisation error for attribute %s in %s" % (attrname, dn))
158 normalised = self.samdb.dsdb_normalise_attributes(self.samdb_schema, attrname, [val])
159 if len(normalised) != 1:
160 self.report("Unable to normalise value '%s'" % val)
161 mod_list.append((val, ''))
162 elif (normalised[0] != val):
163 self.report("value '%s' should be '%s'" % (val, normalised[0]))
164 mod_list.append((val, normalised[0]))
165 if not self.confirm_all('Fix normalisation for %s from %s?' % (attrname, dn), 'fix_all_normalisation'):
166 self.report("Not fixing attribute %s" % attrname)
171 for i in range(0, len(mod_list)):
172 (val, nval) = mod_list[i]
173 m['value_%u' % i] = ldb.MessageElement(val, ldb.FLAG_MOD_DELETE, attrname)
175 m['normv_%u' % i] = ldb.MessageElement(nval, ldb.FLAG_MOD_ADD, attrname)
178 self.report(self.samdb.write_ldif(m, ldb.CHANGETYPE_MODIFY))
180 self.samdb.modify(m, controls=["relax:0", "show_deleted:1"], validate=False)
181 except Exception, msg:
182 self.report("Failed to normalise attribute %s : %s" % (attrname, msg))
184 self.report("Normalised attribute %s" % attrname)
186 def is_deleted_objects_dn(self, dsdb_dn):
187 '''see if a dsdb_DN is the special Deleted Objects DN'''
188 return dsdb_dn.prefix == "B:32:18E2EA80684F11D2B9AA00C04F79F805:"
191 ################################################################
192 # handle a missing GUID extended DN component
193 def err_incorrect_dn_GUID(self, dn, attrname, val, dsdb_dn, errstr):
194 self.report("ERROR: %s component for %s in object %s - %s" % (errstr, attrname, dn, val))
195 controls=["extended_dn:1:1", "show_deleted:1"]
197 res = self.samdb.search(base=str(dsdb_dn.dn), scope=ldb.SCOPE_BASE,
198 attrs=[], controls=controls)
199 except ldb.LdbError, (enum, estr):
200 self.report("unable to find object for DN %s - cannot fix (%s)" % (dsdb_dn.dn, estr))
202 dsdb_dn.dn = res[0].dn
204 if not self.confirm_all('Change DN to %s?' % str(dsdb_dn), 'fix_all_DN_GUIDs'):
205 self.report("Not fixing %s" % errstr)
209 m['old_value'] = ldb.MessageElement(val, ldb.FLAG_MOD_DELETE, attrname)
210 m['new_value'] = ldb.MessageElement(str(dsdb_dn), ldb.FLAG_MOD_ADD, attrname)
212 self.report(self.samdb.write_ldif(m, ldb.CHANGETYPE_MODIFY))
214 self.samdb.modify(m, controls=["show_deleted:1"])
215 except Exception, msg:
216 self.report("Failed to fix %s on attribute %s : %s" % (errstr, attrname, msg))
218 self.report("Fixed %s on attribute %s" % (errstr, attrname))
221 ################################################################
222 # handle a DN pointing to a deleted object
223 def err_deleted_dn(self, dn, attrname, val, dsdb_dn, correct_dn):
224 self.report("ERROR: target DN is deleted for %s in object %s - %s" % (attrname, dn, val))
225 self.report("Target GUID points at deleted DN %s" % correct_dn)
226 if not self.confirm_all('Remove DN?', 'remove_all_deleted_DN_links'):
227 self.report("Not removing")
231 m['old_value'] = ldb.MessageElement(val, ldb.FLAG_MOD_DELETE, attrname)
233 self.report(self.samdb.write_ldif(m, ldb.CHANGETYPE_MODIFY))
235 self.samdb.modify(m, controls=["show_deleted:1"])
236 except Exception, msg:
237 self.report("Failed to remove deleted DN attribute %s : %s" % (attrname, msg))
239 self.report("Removed deleted DN on attribute %s" % attrname)
242 ################################################################
243 # handle a DN string being incorrect
244 def err_dn_target_mismatch(self, dn, attrname, val, dsdb_dn, correct_dn, errstr):
245 self.report("ERROR: incorrect DN string component for %s in object %s - %s" % (attrname, dn, val))
246 dsdb_dn.dn = correct_dn
248 if not self.confirm_all('Change DN to %s?' % str(dsdb_dn), 'fix_all_target_mismatch'):
249 self.report("Not fixing %s" % errstr)
253 m['old_value'] = ldb.MessageElement(val, ldb.FLAG_MOD_DELETE, attrname)
254 m['new_value'] = ldb.MessageElement(str(dsdb_dn), ldb.FLAG_MOD_ADD, attrname)
256 self.report(self.samdb.write_ldif(m, ldb.CHANGETYPE_MODIFY))
258 self.samdb.modify(m, controls=["show_deleted:1"])
259 except Exception, msg:
260 self.report("Failed to fix incorrect DN string on attribute %s : %s" % (attrname, msg))
262 self.report("Fixed incorrect DN string on attribute %s" % (attrname))
264 ################################################################
265 # handle an unknown attribute error
266 def err_unknown_attribute(self, obj, attrname):
267 '''handle an unknown attribute error'''
268 self.report("ERROR: unknown attribute '%s' in %s" % (attrname, obj.dn))
269 if not self.confirm_all('Remove unknown attribute %s' % attrname, 'remove_all_unknown_attributes'):
270 self.report("Not removing %s" % attrname)
274 m['old_value'] = ldb.MessageElement([], ldb.FLAG_MOD_DELETE, attrname)
276 self.report(self.samdb.write_ldif(m, ldb.CHANGETYPE_MODIFY))
278 self.samdb.modify(m, controls=["relax:0", "show_deleted:1"])
279 except Exception, msg:
280 self.report("Failed to remove unknown attribute %s : %s" % (attrname, msg))
282 self.report("Removed unknown attribute %s" % (attrname))
285 ################################################################
286 # specialised checking for a dn attribute
287 def check_dn(self, obj, attrname, syntax_oid):
288 '''check a DN attribute for correctness'''
290 for val in obj[attrname]:
291 dsdb_dn = dsdb_DN(self.samdb, val, syntax_oid)
293 # all DNs should have a GUID component
294 guid = dsdb_dn.dn.get_extended_component("GUID")
297 self.err_incorrect_dn_GUID(obj.dn, attrname, val, dsdb_dn, "missing GUID")
300 guidstr = str(misc.GUID(guid))
302 # check its the right GUID
304 res = self.samdb.search(base="<GUID=%s>" % guidstr, scope=ldb.SCOPE_BASE,
305 attrs=['isDeleted'], controls=["extended_dn:1:1", "show_deleted:1"])
306 except ldb.LdbError, (enum, estr):
308 self.err_incorrect_dn_GUID(obj.dn, attrname, val, dsdb_dn, "incorrect GUID")
311 # now we have two cases - the source object might or might not be deleted
312 is_deleted = 'isDeleted' in obj and obj['isDeleted'][0].upper() == 'TRUE'
313 target_is_deleted = 'isDeleted' in res[0] and res[0]['isDeleted'][0].upper() == 'TRUE'
315 # the target DN is not allowed to be deleted, unless the target DN is the
316 # special Deleted Objects container
317 if target_is_deleted and not is_deleted and not self.is_deleted_objects_dn(dsdb_dn):
319 self.err_deleted_dn(obj.dn, attrname, val, dsdb_dn, res[0].dn)
322 # check the DN matches in string form
323 if res[0].dn.extended_str() != dsdb_dn.dn.extended_str():
325 self.err_dn_target_mismatch(obj.dn, attrname, val, dsdb_dn,
326 res[0].dn, "incorrect string version of DN")
332 def process_metadata(self, val):
333 '''Read metadata properties and list attributes in it'''
337 repl = ndr_unpack(drsblobs.replPropertyMetaDataBlob, str(val))
340 for o in repl.ctr.array:
341 att = self.samdb_schema.get_lDAPDisplayName_by_attid(o.attid)
342 list_att.append(att.lower())
347 def fix_metadata(self, dn, attr):
348 '''re-write replPropertyMetaData elements for a single attribute for a
349 object. This is used to fix missing replPropertyMetaData elements'''
350 res = self.samdb.search(base = dn, scope=ldb.SCOPE_BASE, attrs = [attr],
351 controls = ["search_options:1:2", "show_deleted:1"])
355 nmsg[attr] = ldb.MessageElement(msg[attr], ldb.FLAG_MOD_REPLACE, attr)
357 self.samdb.modify(nmsg, controls = ["relax:0", "provision:0", "show_deleted:1"])
358 except Exception, err:
359 self.report("Failed to fix metadata for attribute %s : %s" % (attr, err))
361 self.report("Fixed metadata for attribute %s" % attr)
364 ################################################################
365 # check one object - calls to individual error handlers above
366 def check_object(self, dn, attrs=['*']):
367 '''check one object'''
369 self.report("Checking object %s" % dn)
371 attrs.append("replPropertyMetaData")
373 res = self.samdb.search(base=dn, scope=ldb.SCOPE_BASE,
374 controls=["extended_dn:1:1", "show_deleted:1"],
377 self.report("Object %s disappeared during check" % dn)
381 list_attrs_from_md = []
388 if str(attrname).lower() == 'replpropertymetadata':
389 list_attrs_from_md = self.process_metadata(obj[attrname])
393 # check for empty attributes
394 for val in obj[attrname]:
396 self.err_empty_attribute(dn, attrname)
400 # get the syntax oid for the attribute, so we can can have
401 # special handling for some specific attribute types
403 syntax_oid = self.samdb_schema.get_syntax_oid_from_lDAPDisplayName(attrname)
404 except Exception, msg:
405 self.err_unknown_attribute(obj, attrname)
409 flag = self.samdb_schema.get_systemFlags_from_lDAPDisplayName(attrname)
410 if (not flag & dsdb.DS_FLAG_ATTR_NOT_REPLICATED
411 and not flag & dsdb.DS_FLAG_ATTR_IS_CONSTRUCTED
412 and not self.samdb_schema.get_linkId_from_lDAPDisplayName(attrname)):
413 list_attrs_seen.append(str(attrname).lower())
415 if syntax_oid in [ dsdb.DSDB_SYNTAX_BINARY_DN, dsdb.DSDB_SYNTAX_OR_NAME,
416 dsdb.DSDB_SYNTAX_STRING_DN, ldb.LDB_SYNTAX_DN ]:
417 # it's some form of DN, do specialised checking on those
418 error_count += self.check_dn(obj, attrname, syntax_oid)
420 # check for incorrectly normalised attributes
421 for val in obj[attrname]:
422 normalised = self.samdb.dsdb_normalise_attributes(self.samdb_schema, attrname, [val])
423 if len(normalised) != 1 or normalised[0] != val:
424 self.err_normalise_mismatch(dn, attrname, obj[attrname])
429 for att in list_attrs_seen:
430 if not att in list_attrs_from_md:
432 self.report("On object %s" % dn)
435 self.report("ERROR: Attribute %s not present in replication metadata" % att)
436 if not self.confirm_all("Fix missing replPropertyMetaData element '%s'" % att, 'fix_all_metadata'):
437 self.report("Not fixing missing replPropertyMetaData element '%s'" % att)
439 self.fix_metadata(dn, att)