# Authors: # Pavel Zuna # John Dennis # # Copyright (C) 2009 Red Hat # see file 'COPYING' for use and warranty information # # 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 . """ Backend plugin for LDAP. """ # Entries are represented as (dn, entry_attrs), where entry_attrs is a dict # mapping attribute names to values. Values can be a single value or list/tuple # of virtually any type. Each method passing these values to the python-ldap # binding encodes them into the appropriate representation. This applies to # everything except the CrudBackend methods, where dn is part of the entry dict. import os import re import pwd import krbV import ldap as _ldap from ipapython.dn import DN from ipapython.ipaldap import SASL_GSSAPI, IPASimpleLDAPObject, LDAPClient try: from ldap.controls.simple import GetEffectiveRightsControl #pylint: disable=F0401,E0611 except ImportError: """ python-ldap 2.4.x introduced a new API for effective rights control, which needs to be used or otherwise bind dn is not passed correctly. The following class is created for backward compatibility with python-ldap 2.3.x. Relevant BZ: https://bugzilla.redhat.com/show_bug.cgi?id=802675 """ from ldap.controls import LDAPControl class GetEffectiveRightsControl(LDAPControl): def __init__(self, criticality, authzId=None): LDAPControl.__init__(self, '1.3.6.1.4.1.42.2.27.9.5.2', criticality, authzId) from ipalib import api, errors from ipalib.crud import CrudBackend from ipalib.request import context # Group Member types MEMBERS_ALL = 0 MEMBERS_DIRECT = 1 MEMBERS_INDIRECT = 2 class ldap2(LDAPClient, CrudBackend): """ LDAP Backend Take 2. """ def __init__(self, shared_instance=True, ldap_uri=None, base_dn=None, schema=None): try: ldap_uri = ldap_uri or api.env.ldap_uri except AttributeError: ldap_uri = 'ldap://example.com' CrudBackend.__init__(self, shared_instance=shared_instance) LDAPClient.__init__(self, ldap_uri) try: if base_dn is not None: self.base_dn = DN(base_dn) else: self.base_dn = DN(api.env.basedn) except AttributeError: self.base_dn = DN() def _init_connection(self): # Connectible.conn is a proxy to thread-local storage; # do not set it pass def get_api(self): return api def __del__(self): if self.isconnected(): self.disconnect() def __str__(self): return self.ldap_uri def create_connection(self, ccache=None, bind_dn=None, bind_pw='', tls_cacertfile=None, tls_certfile=None, tls_keyfile=None, debug_level=0, autobind=False): """ Connect to LDAP server. Keyword arguments: ldapuri -- the LDAP server to connect to ccache -- Kerberos V5 ccache object or name bind_dn -- dn used to bind to the server bind_pw -- password used to bind to the server debug_level -- LDAP debug level option tls_cacertfile -- TLS CA certificate filename tls_certfile -- TLS certificate filename tls_keyfile - TLS bind key filename autobind - autobind as the current user Extends backend.Connectible.create_connection. """ if bind_dn is None: bind_dn = DN() assert isinstance(bind_dn, DN) if tls_cacertfile is not None: _ldap.set_option(_ldap.OPT_X_TLS_CACERTFILE, tls_cacertfile) if tls_certfile is not None: _ldap.set_option(_ldap.OPT_X_TLS_CERTFILE, tls_certfile) if tls_keyfile is not None: _ldap.set_option(_ldap.OPT_X_TLS_KEYFILE, tls_keyfile) if debug_level: _ldap.set_option(_ldap.OPT_DEBUG_LEVEL, debug_level) with self.error_handler(): force_updates = api.env.context in ('installer', 'updates') conn = IPASimpleLDAPObject( self.ldap_uri, force_schema_updates=force_updates) if self.ldap_uri.startswith('ldapi://') and ccache: conn.set_option(_ldap.OPT_HOST_NAME, api.env.host) minssf = conn.get_option(_ldap.OPT_X_SASL_SSF_MIN) maxssf = conn.get_option(_ldap.OPT_X_SASL_SSF_MAX) # Always connect with at least an SSF of 56, confidentiality # This also protects us from a broken ldap.conf if minssf < 56: minssf = 56 conn.set_option(_ldap.OPT_X_SASL_SSF_MIN, minssf) if maxssf < minssf: conn.set_option(_ldap.OPT_X_SASL_SSF_MAX, minssf) if ccache is not None: if isinstance(ccache, krbV.CCache): principal = ccache.principal().name # Get a fully qualified CCACHE name (schema+name) # As we do not use the krbV.CCache object later, # we can safely overwrite it ccache = "%(type)s:%(name)s" % dict(type=ccache.type, name=ccache.name) else: principal = krbV.CCache(name=ccache, context=krbV.default_context()).principal().name os.environ['KRB5CCNAME'] = ccache conn.sasl_interactive_bind_s(None, SASL_GSSAPI) setattr(context, 'principal', principal) else: # no kerberos ccache, use simple bind or external sasl if autobind: pent = pwd.getpwuid(os.geteuid()) auth_tokens = _ldap.sasl.external(pent.pw_name) conn.sasl_interactive_bind_s(None, auth_tokens) else: conn.simple_bind_s(bind_dn, bind_pw) return conn def destroy_connection(self): """Disconnect from LDAP server.""" try: self.conn.unbind_s() except _ldap.LDAPError: # ignore when trying to unbind multiple times pass def find_entries(self, filter=None, attrs_list=None, base_dn=None, scope=_ldap.SCOPE_SUBTREE, time_limit=None, size_limit=None, search_refs=False, paged_search=False): if time_limit is None or size_limit is None: config = self.get_ipa_config() if time_limit is None: time_limit = config.get('ipasearchtimelimit', [None])[0] if size_limit is None: size_limit = config.get('ipasearchrecordslimit', [None])[0] res, truncated = super(ldap2, self).find_entries( filter=filter, attrs_list=attrs_list, base_dn=base_dn, scope=scope, time_limit=time_limit, size_limit=size_limit, search_refs=search_refs, paged_search=paged_search) if attrs_list and ( 'memberindirect' in attrs_list or '*' in attrs_list): for r in res: if not 'member' in r[1]: continue else: members = r[1]['member'] indirect = self.get_members( r[0], members, membertype=MEMBERS_INDIRECT, time_limit=time_limit, size_limit=size_limit) if len(indirect) > 0: r[1]['memberindirect'] = indirect if attrs_list and ( 'memberofindirect' in attrs_list or '*' in attrs_list): for r in res: if 'memberof' in r[1]: memberof = r[1]['memberof'] del r[1]['memberof'] elif 'memberOf' in r[1]: memberof = r[1]['memberOf'] del r[1]['memberOf'] else: continue direct, indirect = self.get_memberof( r[0], memberof, time_limit=time_limit, size_limit=size_limit) if len(direct) > 0: r[1]['memberof'] = direct if len(indirect) > 0: r[1]['memberofindirect'] = indirect return (res, truncated) def get_members(self, group_dn, members, attr_list=[], membertype=MEMBERS_ALL, time_limit=None, size_limit=None): """Do a memberOf search of groupdn and return the attributes in attr_list (an empty list returns all attributes). membertype = MEMBERS_ALL all members returned membertype = MEMBERS_DIRECT only direct members are returned membertype = MEMBERS_INDIRECT only inherited members are returned Members may be included in a group as a result of being a member of a group that is a member of the group being queried. Returns a list of DNs. """ assert isinstance(group_dn, DN) if membertype not in [MEMBERS_ALL, MEMBERS_DIRECT, MEMBERS_INDIRECT]: return None self.log.debug( "get_members: group_dn=%s members=%s membertype=%s", group_dn, members, membertype) search_group_dn = ldap.filter.escape_filter_chars(str(group_dn)) searchfilter = "(memberof=%s)" % search_group_dn attr_list.append("member") # Verify group membership results = [] if membertype == MEMBERS_ALL or membertype == MEMBERS_INDIRECT: api = self.get_api() if api: user_container_dn = DN(api.env.container_user, api.env.basedn) host_container_dn = DN(api.env.container_host, api.env.basedn) else: user_container_dn = host_container_dn = None checkmembers = set(DN(x) for x in members) checked = set() while checkmembers: member_dn = checkmembers.pop() checked.add(member_dn) # No need to check entry types that are not nested for # additional members if user_container_dn and ( member_dn.endswith(user_container_dn) or member_dn.endswith(host_container_dn)): results.append([member_dn, {}]) continue try: result, truncated = self.find_entries( searchfilter, attr_list, member_dn, time_limit=time_limit, size_limit=size_limit, scope=ldap.SCOPE_BASE) if truncated: raise errors.LimitsExceeded() results.append(list(result[0])) for m in result[0][1].get('member', []): # This member may contain other members, add it to our # candidate list if m not in checked: checkmembers.add(m) except errors.NotFound: pass if membertype == MEMBERS_ALL: entries = [] for e in results: entries.append(e[0]) return entries dn, group = self.get_entry( group_dn, ['member'], size_limit=size_limit, time_limit=time_limit) real_members = group.get('member', []) entries = [] for e in results: if e[0] not in real_members and e[0] not in entries: if membertype == MEMBERS_INDIRECT: entries.append(e[0]) else: if membertype == MEMBERS_DIRECT: entries.append(e[0]) self.log.debug("get_members: result=%s", entries) return entries def get_memberof(self, entry_dn, memberof, time_limit=None, size_limit=None): """ Examine the objects that an entry is a member of and determine if they are a direct or indirect member of that group. entry_dn: dn of the entry we want the direct/indirect members of memberof: the memberOf attribute for entry_dn Returns two memberof lists: (direct, indirect) """ assert isinstance(entry_dn, DN) self.log.debug( "get_memberof: entry_dn=%s memberof=%s", entry_dn, memberof) if not type(memberof) in (list, tuple): return ([], []) if len(memberof) == 0: return ([], []) search_entry_dn = ldap.filter.escape_filter_chars(str(entry_dn)) attr_list = ["memberof"] searchfilter = "(|(member=%s)(memberhost=%s)(memberuser=%s))" % ( search_entry_dn, search_entry_dn, search_entry_dn) # Search only the groups for which the object is a member to # determine if it is directly or indirectly associated. results = [] for group in memberof: assert isinstance(group, DN) try: result, truncated = self.find_entries( searchfilter, attr_list, group, time_limit=time_limit, size_limit=size_limit, scope=ldap.SCOPE_BASE) results.extend(list(result)) except errors.NotFound: pass direct = [] # If there is an exception here, it is likely due to a failure in # referential integrity. All members should have corresponding # memberOf entries. indirect = list(memberof) for r in results: direct.append(r[0]) try: indirect.remove(r[0]) except ValueError, e: self.log.info( 'Failed to remove indirect entry %s from %s', r[0], entry_dn) raise e self.log.debug( "get_memberof: result direct=%s indirect=%s", direct, indirect) return (direct, indirect) config_defaults = {'ipasearchtimelimit': [2], 'ipasearchrecordslimit': [0]} def get_ipa_config(self, attrs_list=None): """Returns the IPA configuration entry (dn, entry_attrs).""" dn = api.Object.config.get_dn() assert isinstance(dn, DN) try: config_entry = getattr(context, 'config_entry') if config_entry.conn is self.conn: return config_entry.clone() except AttributeError: # Not in our context yet pass try: (entry, truncated) = self.find_entries( None, attrs_list, base_dn=dn, scope=self.SCOPE_BASE, time_limit=2, size_limit=10 ) if truncated: raise errors.LimitsExceeded() config_entry = entry[0] except errors.NotFound: config_entry = self.make_entry(dn) for a in self.config_defaults: if a not in config_entry: config_entry[a] = self.config_defaults[a] context.config_entry = config_entry.clone() return config_entry def has_upg(self): """Returns True/False whether User-Private Groups are enabled. This is determined based on whether the UPG Template exists. """ upg_dn = DN(('cn', 'UPG Definition'), ('cn', 'Definitions'), ('cn', 'Managed Entries'), ('cn', 'etc'), api.env.basedn) try: upg_entry = self.conn.search_s(upg_dn, _ldap.SCOPE_BASE, attrlist=['*'])[0] disable_attr = '(objectclass=disable)' if 'originfilter' in upg_entry[1]: org_filter = upg_entry[1]['originfilter'] return not bool(re.search(r'%s' % disable_attr, org_filter[0])) else: return False except _ldap.NO_SUCH_OBJECT, e: return False def get_effective_rights(self, dn, entry_attrs): """Returns the rights the currently bound user has for the given DN. Returns 2 attributes, the attributeLevelRights for the given list of attributes and the entryLevelRights for the entry itself. """ assert isinstance(dn, DN) principal = getattr(context, 'principal') (binddn, attrs) = self.find_entry_by_attr("krbprincipalname", principal, "krbPrincipalAux", base_dn=api.env.basedn) assert isinstance(binddn, DN) sctrl = [GetEffectiveRightsControl(True, "dn: " + str(binddn))] self.conn.set_option(_ldap.OPT_SERVER_CONTROLS, sctrl) (dn, attrs) = self.get_entry(dn, entry_attrs) # remove the control so subsequent operations don't include GER self.conn.set_option(_ldap.OPT_SERVER_CONTROLS, []) return (dn, attrs) def can_write(self, dn, attr): """Returns True/False if the currently bound user has write permissions on the attribute. This only operates on a single attribute at a time. """ assert isinstance(dn, DN) (dn, attrs) = self.get_effective_rights(dn, [attr]) if 'attributelevelrights' in attrs: attr_rights = attrs.get('attributelevelrights')[0].decode('UTF-8') (attr, rights) = attr_rights.split(':') if 'w' in rights: return True return False def can_read(self, dn, attr): """Returns True/False if the currently bound user has read permissions on the attribute. This only operates on a single attribute at a time. """ assert isinstance(dn, DN) (dn, attrs) = self.get_effective_rights(dn, [attr]) if 'attributelevelrights' in attrs: attr_rights = attrs.get('attributelevelrights')[0].decode('UTF-8') (attr, rights) = attr_rights.split(':') if 'r' in rights: return True return False # # Entry-level effective rights # # a - Add # d - Delete # n - Rename the DN # v - View the entry # def can_delete(self, dn): """Returns True/False if the currently bound user has delete permissions on the entry. """ assert isinstance(dn, DN) (dn, attrs) = self.get_effective_rights(dn, ["*"]) if 'entrylevelrights' in attrs: entry_rights = attrs['entrylevelrights'][0].decode('UTF-8') if 'd' in entry_rights: return True return False def can_add(self, dn): """Returns True/False if the currently bound user has add permissions on the entry. """ assert isinstance(dn, DN) (dn, attrs) = self.get_effective_rights(dn, ["*"]) if 'entrylevelrights' in attrs: entry_rights = attrs['entrylevelrights'][0].decode('UTF-8') if 'a' in entry_rights: return True return False def modify_password(self, dn, new_pass, old_pass=''): """Set user password.""" assert isinstance(dn, DN) # The python-ldap passwd command doesn't verify the old password # so we'll do a simple bind to validate it. if old_pass != '': with self.error_handler(): conn = IPASimpleLDAPObject( self.ldap_uri, force_schema_updates=False) conn.simple_bind_s(dn, old_pass) conn.unbind_s() with self.error_handler(): self.conn.passwd_s(dn, old_pass, new_pass) def add_entry_to_group(self, dn, group_dn, member_attr='member', allow_same=False): """ Add entry designaed by dn to group group_dn in the member attribute member_attr. Adding a group as a member of itself is not allowed unless allow_same is True. """ assert isinstance(dn, DN) assert isinstance(group_dn, DN) self.log.debug( "add_entry_to_group: dn=%s group_dn=%s member_attr=%s", dn, group_dn, member_attr) # check if the entry exists entry = self.get_entry(dn, ['']) dn = entry.dn # check if we're not trying to add group into itself if dn == group_dn and not allow_same: raise errors.SameGroupError() # add dn to group entry's `member_attr` attribute modlist = [(_ldap.MOD_ADD, member_attr, [dn])] # update group entry try: with self.error_handler(): self.conn.modify_s(group_dn, modlist) except errors.DatabaseError: raise errors.AlreadyGroupMember() def remove_entry_from_group(self, dn, group_dn, member_attr='member'): """Remove entry from group.""" assert isinstance(dn, DN) assert isinstance(group_dn, DN) self.log.debug( "remove_entry_from_group: dn=%s group_dn=%s member_attr=%s", dn, group_dn, member_attr) # remove dn from group entry's `member_attr` attribute modlist = [(_ldap.MOD_DELETE, member_attr, [dn])] # update group entry try: with self.error_handler(): self.conn.modify_s(group_dn, modlist) except errors.MidairCollision: raise errors.NotGroupMember() def set_entry_active(self, dn, active): """Mark entry active/inactive.""" assert isinstance(dn, DN) assert isinstance(active, bool) # get the entry in question (dn, entry_attrs) = self.get_entry(dn, ['nsaccountlock']) # check nsAccountLock attribute account_lock_attr = entry_attrs.get('nsaccountlock', ['false']) account_lock_attr = account_lock_attr[0].lower() if active: if account_lock_attr == 'false': raise errors.AlreadyActive() else: if account_lock_attr == 'true': raise errors.AlreadyInactive() # LDAP expects string instead of Bool but it also requires it to be TRUE or FALSE, # not True or False as Python stringification does. Thus, we uppercase it. account_lock_attr = str(not active).upper() entry_attrs['nsaccountlock'] = account_lock_attr self.update_entry(dn, entry_attrs) def activate_entry(self, dn): """Mark entry active.""" assert isinstance(dn, DN) self.set_entry_active(dn, True) def deactivate_entry(self, dn): """Mark entry inactive.""" assert isinstance(dn, DN) self.set_entry_active(dn, False) def remove_principal_key(self, dn): """Remove a kerberos principal key.""" assert isinstance(dn, DN) # We need to do this directly using the LDAP library because we # don't have read access to krbprincipalkey so we need to delete # it in the blind. mod = [(_ldap.MOD_REPLACE, 'krbprincipalkey', None), (_ldap.MOD_REPLACE, 'krblastpwdchange', None)] with self.error_handler(): self.conn.modify_s(dn, mod) # CrudBackend methods def _get_normalized_entry_for_crud(self, dn, attrs_list=None): assert isinstance(dn, DN) (dn, entry_attrs) = self.get_entry(dn, attrs_list) return entry_attrs def create(self, **kw): """ Create a new entry and return it as one dict (DN included). Extends CrudBackend.create. """ assert 'dn' in kw dn = kw['dn'] assert isinstance(dn, DN) del kw['dn'] self.add_entry(dn, kw) return self._get_normalized_entry_for_crud(dn) def retrieve(self, primary_key, attributes): """ Get entry by primary_key (DN) as one dict (DN included). Extends CrudBackend.retrieve. """ return self._get_normalized_entry_for_crud(primary_key, attributes) def update(self, primary_key, **kw): """ Update entry's attributes and return it as one dict (DN included). Extends CrudBackend.update. """ self.update_entry(primary_key, kw) return self._get_normalized_entry_for_crud(primary_key) def delete(self, primary_key): """ Delete entry by primary_key (DN). Extends CrudBackend.delete. """ self.delete_entry(primary_key) def search(self, **kw): """ Return a list of entries (each entry is one dict, DN included) matching the specified criteria. Keyword arguments: filter -- search filter (default: '') attrs_list -- list of attributes to return, all if None (default None) base_dn -- dn of the entry at which to start the search (default '') scope -- search scope, see LDAP docs (default ldap2.SCOPE_SUBTREE) Extends CrudBackend.search. """ # get keyword arguments filter = kw.pop('filter', None) attrs_list = kw.pop('attrs_list', None) base_dn = kw.pop('base_dn', DN()) assert isinstance(base_dn, DN) scope = kw.pop('scope', self.SCOPE_SUBTREE) # generate filter filter_tmp = self.make_filter(kw) if filter: filter = self.combine_filters((filter, filter_tmp), self.MATCH_ALL) else: filter = filter_tmp if not filter: filter = '(objectClass=*)' # find entries and normalize the output for CRUD output = [] (entries, truncated) = self.find_entries( filter, attrs_list, base_dn, scope ) for (dn, entry_attrs) in entries: output.append(entry_attrs) if truncated: return (-1, output) return (len(output), output) api.register(ldap2)