# Authors: Karl MacMillan # Simo Sorce # # Copyright (C) 2007 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 . # import shutil import logging import pwd import glob import sys import os import re import time import tempfile from ipapython import ipautil from ipapython import sysrestore import service import installutils import certs import ldap from ldap.dn import escape_dn_chars from ipaserver import ipaldap from ipaserver.install import ldapupdate from ipaserver.install import httpinstance from ipaserver.install import replication from ipalib import util, errors from ipaserver.plugins.ldap2 import ldap2 SERVER_ROOT_64 = "/usr/lib64/dirsrv" SERVER_ROOT_32 = "/usr/lib/dirsrv" CACERT="/etc/ipa/ca.crt" DS_USER = 'dirsrv' DS_GROUP = 'dirsrv' def find_server_root(): if ipautil.dir_exists(SERVER_ROOT_64): return SERVER_ROOT_64 else: return SERVER_ROOT_32 def realm_to_serverid(realm_name): return "-".join(realm_name.split(".")) def config_dirname(serverid): return "/etc/dirsrv/slapd-" + serverid + "/" def schema_dirname(serverid): return config_dirname(serverid) + "/schema/" def erase_ds_instance_data(serverid): try: shutil.rmtree("/etc/dirsrv/slapd-%s" % serverid) except: pass try: shutil.rmtree("/usr/lib/dirsrv/slapd-%s" % serverid) except: pass try: shutil.rmtree("/usr/lib64/dirsrv/slapd-%s" % serverid) except: pass try: shutil.rmtree("/var/lib/dirsrv/slapd-%s" % serverid) except: pass try: shutil.rmtree("/var/lock/dirsrv/slapd-%s" % serverid) except: pass try: os.unlink("/var/run/slapd-%s.socket" % serverid) except: pass # try: # shutil.rmtree("/var/log/dirsrv/slapd-%s" % serverid) # except: # pass def check_existing_installation(): dirs = glob.glob("/etc/dirsrv/slapd-*") if not dirs: return [] serverids = [] for d in dirs: serverids.append(os.path.basename(d).split("slapd-", 1)[1]) return serverids def check_ports(): ds_unsecure = installutils.port_available(389) ds_secure = installutils.port_available(636) return (ds_unsecure, ds_secure) def is_ds_running(): """The DS init script always returns 0 when requesting status so it cannot be used to determine if the server is running. We have to look at the output. """ ret = True try: (sout, serr, rcode) = ipautil.run(["/sbin/service", "dirsrv", "status"]) if sout.find("is stopped") >= 0: ret = False except ipautil.CalledProcessError: ret = False return ret def has_managed_entries(host_name, dm_password): """Check to see if the Managed Entries plugin is available""" ldapuri = 'ldap://%s' % host_name conn = None try: conn = ldap2(shared_instance=False, ldap_uri=ldapuri, base_dn='cn=config') conn.connect(bind_dn='cn=Directory Manager', bind_pw=dm_password) (dn, attrs) = conn.get_entry('cn=Managed Entries,cn=plugins', ['*'], time_limit=2, size_limit=3000) return True except errors.NotFound: return False except errors.ExecutionError, e: logging.critical("Could not connect to the Directory Server on %s" % host_name) raise e finally: if conn.isconnected(): conn.disconnect() INF_TEMPLATE = """ [General] FullMachineName= $FQHN SuiteSpotUserID= $USER SuiteSpotGroup= $GROUP ServerRoot= $SERVER_ROOT [slapd] ServerPort= 389 ServerIdentifier= $SERVERID Suffix= $SUFFIX RootDN= cn=Directory Manager RootDNPwd= $PASSWORD InstallLdifFile= /var/lib/dirsrv/boot.ldif inst_dir= /var/lib/dirsrv/scripts-$SERVERID """ BASE_TEMPLATE = """ dn: $SUFFIX objectClass: top objectClass: domain objectClass: pilotObject dc: $BASEDC info: IPA V2.0 """ class DsInstance(service.Service): def __init__(self, realm_name=None, domain_name=None, dm_password=None, fstore=None): service.Service.__init__(self, "dirsrv", dm_password=dm_password) self.realm_name = realm_name self.sub_dict = None self.domain = domain_name self.serverid = None self.fqdn = None self.pkcs12_info = None self.dercert = None self.idstart = None self.idmax = None self.subject_base = None if realm_name: self.suffix = util.realm_to_suffix(self.realm_name) self.__setup_sub_dict() else: self.suffix = None if fstore: self.fstore = fstore else: self.fstore = sysrestore.FileStore('/var/lib/ipa/sysrestore') def __common_setup(self): self.step("creating directory server user", self.__create_ds_user) self.step("creating directory server instance", self.__create_instance) self.step("adding default schema", self.__add_default_schemas) self.step("enabling memberof plugin", self.__add_memberof_module) self.step("enabling referential integrity plugin", self.__add_referint_module) self.step("enabling winsync plugin", self.__add_winsync_module) self.step("configuring replication version plugin", self.__config_version_module) self.step("enabling IPA enrollment plugin", self.__add_enrollment_module) self.step("enabling ldapi", self.__enable_ldapi) self.step("configuring uniqueness plugin", self.__set_unique_attrs) self.step("configuring uuid plugin", self.__config_uuid_module) self.step("configuring modrdn plugin", self.__config_modrdn_module) self.step("enabling entryUSN plugin", self.__enable_entryusn) self.step("configuring lockout plugin", self.__config_lockout_module) self.step("creating indices", self.__create_indices) self.step("configuring ssl for ds instance", self.__enable_ssl) self.step("configuring certmap.conf", self.__certmap_conf) self.step("configure autobind for root", self.__root_autobind) self.step("restarting directory server", self.__restart_instance) def __common_post_setup(self): self.step("initializing group membership", self.init_memberof) self.step("adding master entry", self.__add_master_entry) self.step("configuring Posix uid/gid generation", self.__config_uidgid_gen) self.step("enabling compatibility plugin", self.__enable_compat_plugin) self.step("tuning directory server", self.__tuning) self.step("configuring directory to start on boot", self.__enable) def create_instance(self, realm_name, fqdn, domain_name, dm_password, pkcs12_info=None, self_signed_ca=False, idstart=1100, idmax=999999, subject_base=None, hbac_allow=True): self.realm_name = realm_name.upper() self.serverid = realm_to_serverid(self.realm_name) self.suffix = util.realm_to_suffix(self.realm_name) self.fqdn = fqdn self.dm_password = dm_password self.domain = domain_name self.pkcs12_info = pkcs12_info self.self_signed_ca = self_signed_ca self.idstart = idstart self.idmax = idmax self.principal = "ldap/%s@%s" % (self.fqdn, self.realm_name) self.subject_base = subject_base self.__setup_sub_dict() self.__common_setup() self.step("adding default layout", self.__add_default_layout) self.step("adding delegation layout", self.__add_delegation_layout) self.step("adding replication acis", self.__add_replication_acis) self.step("configuring user private groups", self.__user_private_groups) self.step("configuring netgroups from hostgroups", self.__host_nis_groups) self.step("creating default Sudo bind user", self.__add_sudo_binduser) if hbac_allow: self.step("creating default HBAC rule allow_all", self.add_hbac) self.__common_post_setup() self.start_creation("Configuring directory server", 60) def create_replica(self, realm_name, master_fqdn, fqdn, domain_name, dm_password, pkcs12_info=None): self.realm_name = realm_name.upper() self.serverid = realm_to_serverid(self.realm_name) self.suffix = util.realm_to_suffix(self.realm_name) self.master_fqdn = master_fqdn self.fqdn = fqdn self.dm_password = dm_password self.domain = domain_name self.pkcs12_info = pkcs12_info self.principal = "ldap/%s@%s" % (self.fqdn, self.realm_name) self.self_signed_ca = False self.subject_base = None # idstart and idmax are configured so that the range is seen as # depleted by the DNA plugin and the replica will go and get a # new range from the master. # This way all servers use the initially defined range by default. self.idstart = 1101 self.idmax = 1100 self.__setup_sub_dict() self.__common_setup() self.step("setting up initial replication", self.__setup_replica) self.step("adding replication acis", self.__add_replication_acis) self.__common_post_setup() self.start_creation("Configuring directory server", 60) def __setup_replica(self): replication.enable_replication_version_checking(self.fqdn, self.realm_name, self.dm_password) repl = replication.ReplicationManager(self.realm_name, self.fqdn, self.dm_password) repl.setup_replication(self.master_fqdn, "cn=Directory Manager", self.dm_password) def __enable(self): self.backup_state("enabled", self.is_enabled()) # At the end of the installation ipa-server-install will enable the # 'ipa' service wich takes care of starting/stopping dirsrv # self.chkconfig_on() self.chkconfig_off() def __setup_sub_dict(self): server_root = find_server_root() self.sub_dict = dict(FQHN=self.fqdn, SERVERID=self.serverid, PASSWORD=self.dm_password, RANDOM_PASSWORD=self.generate_random(), SUFFIX=self.suffix.lower(), REALM=self.realm_name, USER=DS_USER, SERVER_ROOT=server_root, DOMAIN=self.domain, TIME=int(time.time()), IDSTART=self.idstart, IDMAX=self.idmax, HOST=self.fqdn, ESCAPED_SUFFIX= escape_dn_chars(self.suffix.lower()), GROUP=DS_GROUP, ) def __create_ds_user(self): user_exists = True try: pwd.getpwnam(DS_USER) logging.debug("ds user %s exists" % DS_USER) except KeyError: user_exists = False logging.debug("adding ds user %s" % DS_USER) args = ["/usr/sbin/useradd", "-g", DS_GROUP, "-c", "DS System User", "-d", "/var/lib/dirsrv", "-s", "/sbin/nologin", "-M", "-r", DS_USER] try: ipautil.run(args) logging.debug("done adding user") except ipautil.CalledProcessError, e: logging.critical("failed to add user %s" % e) self.backup_state("user_exists", user_exists) def __create_instance(self): self.backup_state("running", is_ds_running()) self.backup_state("serverid", self.serverid) self.fstore.backup_file("/etc/sysconfig/dirsrv") self.sub_dict['BASEDC'] = self.realm_name.split('.')[0].lower() base_txt = ipautil.template_str(BASE_TEMPLATE, self.sub_dict) logging.debug(base_txt) base_fd = file("/var/lib/dirsrv/boot.ldif", "w") base_fd.write(base_txt) base_fd.flush() base_fd.close() inf_txt = ipautil.template_str(INF_TEMPLATE, self.sub_dict) logging.debug("writing inf template") inf_fd = ipautil.write_tmp_file(inf_txt) inf_txt = re.sub(r"RootDNPwd=.*\n", "", inf_txt) logging.debug(inf_txt) if ipautil.file_exists("/usr/sbin/setup-ds.pl"): args = ["/usr/sbin/setup-ds.pl", "--silent", "--logfile", "-", "-f", inf_fd.name] logging.debug("calling setup-ds.pl") else: args = ["/usr/bin/ds_newinst.pl", inf_fd.name] logging.debug("calling ds_newinst.pl") try: ipautil.run(args) logging.debug("completed creating ds instance") except ipautil.CalledProcessError, e: logging.critical("failed to restart ds instance %s" % e) logging.debug("restarting ds instance") try: self.restart(self.serverid) logging.debug("done restarting ds instance") except ipautil.CalledProcessError, e: print "failed to restart ds instance", e logging.debug("failed to restart ds instance %s" % e) inf_fd.close() os.remove("/var/lib/dirsrv/boot.ldif") def __add_default_schemas(self): shutil.copyfile(ipautil.SHARE_DIR + "60kerberos.ldif", schema_dirname(self.serverid) + "60kerberos.ldif") shutil.copyfile(ipautil.SHARE_DIR + "60samba.ldif", schema_dirname(self.serverid) + "60samba.ldif") shutil.copyfile(ipautil.SHARE_DIR + "60ipaconfig.ldif", schema_dirname(self.serverid) + "60ipaconfig.ldif") shutil.copyfile(ipautil.SHARE_DIR + "60basev2.ldif", schema_dirname(self.serverid) + "60basev2.ldif") shutil.copyfile(ipautil.SHARE_DIR + "60ipasudo.ldif", schema_dirname(self.serverid) + "60ipasudo.ldif") try: shutil.move(schema_dirname(self.serverid) + "05rfc2247.ldif", schema_dirname(self.serverid) + "05rfc2247.ldif.old") shutil.copyfile(ipautil.SHARE_DIR + "05rfc2247.ldif", schema_dirname(self.serverid) + "05rfc2247.ldif") except IOError: # Does not apply with newer DS releases pass def __restart_instance(self): try: self.restart(self.serverid) if not is_ds_running(): logging.critical("Failed to restart the directory server. See the installation log for details.") sys.exit(1) except SystemExit, e: raise e except Exception, e: # TODO: roll back here? logging.critical("Failed to restart the directory server. See the installation log for details.") def __enable_entryusn(self): self._ldap_mod("entryusn.ldif") def __add_memberof_module(self): self._ldap_mod("memberof-conf.ldif") def init_memberof(self): self._ldap_mod("memberof-task.ldif", self.sub_dict) def apply_updates(self): ld = ldapupdate.LDAPUpdate(dm_password=self.dm_password, sub_dict=self.sub_dict) files = ld.get_all_files(ldapupdate.UPDATES_DIR) ld.update(files) def __add_referint_module(self): self._ldap_mod("referint-conf.ldif") def __set_unique_attrs(self): self._ldap_mod("unique-attributes.ldif", self.sub_dict) def __config_uidgid_gen(self): if not has_managed_entries(self.fqdn, self.dm_password): raise errors.NotFound(reason='Missing Managed Entries Plugin') self._ldap_mod("dna.ldif", self.sub_dict) def __add_master_entry(self): self._ldap_mod("master-entry.ldif", self.sub_dict) def __add_winsync_module(self): self._ldap_mod("ipa-winsync-conf.ldif") def __enable_compat_plugin(self): ld = ldapupdate.LDAPUpdate(dm_password=self.dm_password, sub_dict=self.sub_dict) rv = ld.update(['/usr/share/ipa/schema_compat.uldif']) if not rv: raise RuntimeError("Enabling compatibility plugin failed") def __config_version_module(self): self._ldap_mod("version-conf.ldif") def __config_uuid_module(self): self._ldap_mod("uuid-conf.ldif") self._ldap_mod("uuid-ipauniqueid.ldif", self.sub_dict) def __config_modrdn_module(self): self._ldap_mod("modrdn-conf.ldif") self._ldap_mod("modrdn-krbprinc.ldif", self.sub_dict) def __config_lockout_module(self): self._ldap_mod("lockout-conf.ldif") def __user_private_groups(self): if not has_managed_entries(self.fqdn, self.dm_password): raise errors.NotFound(reason='Missing Managed Entries Plugin') self._ldap_mod("user_private_groups.ldif", self.sub_dict) def __host_nis_groups(self): if not has_managed_entries(self.fqdn, self.dm_password): raise errors.NotFound(reason='Missing Managed Entries Plugin') self._ldap_mod("host_nis_groups.ldif", self.sub_dict) def __add_enrollment_module(self): self._ldap_mod("enrollment-conf.ldif", self.sub_dict) def generate_random(self): return ipautil.ipa_generate_password() def __enable_ssl(self): dirname = config_dirname(self.serverid) dsdb = certs.CertDB(self.realm_name, nssdir=dirname, subject_base=self.subject_base) if self.pkcs12_info: dsdb.create_from_pkcs12(self.pkcs12_info[0], self.pkcs12_info[1]) server_certs = dsdb.find_server_certs() if len(server_certs) == 0: raise RuntimeError("Could not find a suitable server cert in import in %s" % self.pkcs12_info[0]) # We only handle one server cert nickname = server_certs[0][0] self.dercert = dsdb.get_cert_from_db(nickname) else: nickname = "Server-Cert" cadb = certs.CertDB(self.realm_name, host_name=self.fqdn, subject_base=self.subject_base) if self.self_signed_ca: dsdb.create_from_cacert(cadb.cacert_fname, passwd=None) self.dercert = dsdb.create_server_cert("Server-Cert", self.fqdn, cadb) dsdb.track_server_cert("Server-Cert", self.principal, dsdb.passwd_fname) dsdb.create_pin_file() else: # FIXME, need to set this nickname in the RA plugin cadb.export_ca_cert('ipaCert', False) dsdb.create_from_cacert(cadb.cacert_fname, passwd=None) self.dercert = dsdb.create_server_cert("Server-Cert", self.fqdn, cadb) dsdb.track_server_cert("Server-Cert", self.principal, dsdb.passwd_fname) dsdb.create_pin_file() conn = ipaldap.IPAdmin("127.0.0.1") conn.simple_bind_s("cn=directory manager", self.dm_password) mod = [(ldap.MOD_REPLACE, "nsSSLClientAuth", "allowed"), (ldap.MOD_REPLACE, "nsSSL3Ciphers", "-rsa_null_md5,+rsa_rc4_128_md5,+rsa_rc4_40_md5,+rsa_rc2_40_md5,\ +rsa_des_sha,+rsa_fips_des_sha,+rsa_3des_sha,+rsa_fips_3des_sha,+fortezza,\ +fortezza_rc4_128_sha,+fortezza_null,+tls_rsa_export1024_with_rc4_56_sha,\ +tls_rsa_export1024_with_des_cbc_sha")] conn.modify_s("cn=encryption,cn=config", mod) mod = [(ldap.MOD_ADD, "nsslapd-security", "on"), (ldap.MOD_REPLACE, "nsslapd-ssl-check-hostname", "off")] conn.modify_s("cn=config", mod) entry = ipaldap.Entry("cn=RSA,cn=encryption,cn=config") entry.setValues("objectclass", "top", "nsEncryptionModule") entry.setValues("cn", "RSA") entry.setValues("nsSSLPersonalitySSL", nickname) entry.setValues("nsSSLToken", "internal (software)") entry.setValues("nsSSLActivation", "on") conn.addEntry(entry) conn.unbind() def __add_default_layout(self): self._ldap_mod("bootstrap-template.ldif", self.sub_dict) def __add_delegation_layout(self): self._ldap_mod("delegation.ldif", self.sub_dict) def __add_replication_acis(self): self._ldap_mod("replica-acis.ldif", self.sub_dict) def __create_indices(self): self._ldap_mod("indices.ldif") def __certmap_conf(self): shutil.copyfile(ipautil.SHARE_DIR + "certmap.conf.template", config_dirname(self.serverid) + "certmap.conf") def __enable_ldapi(self): self._ldap_mod("ldapi.ldif", self.sub_dict) def add_hbac(self): self._ldap_mod("default-hbac.ldif", self.sub_dict) def change_admin_password(self, password): logging.debug("Changing admin password") dirname = config_dirname(self.serverid) dmpwdfile = "" admpwdfile = "" try: (dmpwdfd, dmpwdfile) = tempfile.mkstemp(dir='/var/lib/ipa') os.write(dmpwdfd, self.dm_password) os.close(dmpwdfd) (admpwdfd, admpwdfile) = tempfile.mkstemp(dir='/var/lib/ipa') os.write(admpwdfd, password) os.close(admpwdfd) args = ["/usr/bin/ldappasswd", "-h", self.fqdn, "-ZZ", "-x", "-D", "cn=Directory Manager", "-y", dmpwdfile, "-T", admpwdfile, "uid=admin,cn=users,cn=accounts,"+self.suffix] try: env = { 'LDAPTLS_CACERTDIR':os.path.dirname(CACERT), 'LDAPTLS_CACERT':CACERT } ipautil.run(args, env=env) logging.debug("ldappasswd done") except ipautil.CalledProcessError, e: print "Unable to set admin password", e logging.debug("Unable to set admin password %s" % e) finally: if os.path.isfile(dmpwdfile): os.remove(dmpwdfile) if os.path.isfile(admpwdfile): os.remove(admpwdfile) def uninstall(self): if self.is_configured(): self.print_msg("Unconfiguring directory server") running = self.restore_state("running") enabled = self.restore_state("enabled") if not running is None: self.stop() try: self.fstore.restore_file("/etc/security/limits.conf") self.fstore.restore_file("/etc/sysconfig/dirsrv") except ValueError, error: logging.debug(error) pass if not enabled is None and not enabled: self.chkconfig_off() serverid = self.restore_state("serverid") if not serverid is None: # drop the trailing / off the config_dirname so the directory # will match what is in certmonger dirname = config_dirname(serverid)[:-1] dsdb = certs.CertDB(self.realm_name, nssdir=dirname) dsdb.untrack_server_cert("Server-Cert") erase_ds_instance_data(serverid) user_exists = self.restore_state("user_exists") if user_exists == False: try: ipautil.run(["/usr/sbin/userdel", DS_USER]) except ipautil.CalledProcessError, e: logging.critical("failed to delete user %s" % e) if self.restore_state("running"): self.start() # we could probably move this function into the service.Service # class - it's very generic - all we need is a way to get an # instance of a particular Service def add_ca_cert(self, cacert_fname, cacert_name=''): """Add a CA certificate to the directory server cert db. We first have to shut down the directory server in case it has opened the cert db read-only. Then we use the CertDB class to add the CA cert. We have to provide a nickname, and we do not use 'IPA CA' since that's the default, so we use 'Imported CA' if none specified. Then we restart the server.""" # first make sure we have a valid cacert_fname try: if not os.access(cacert_fname, os.R_OK): logging.critical("The given CA cert file named [%s] could not be read" % cacert_fname) return False except OSError, e: logging.critical("The given CA cert file named [%s] could not be read: %s" % (cacert_fname, str(e))) return False # ok - ca cert file can be read # shutdown the server self.stop() dirname = config_dirname(realm_to_serverid(self.realm_name)) certdb = certs.CertDB(self.realm_name, nssdir=dirname, subject_base=self.subject_base) if not cacert_name or len(cacert_name) == 0: cacert_name = "Imported CA" # we can't pass in the nickname, so we set the instance variable certdb.cacert_name = cacert_name status = True try: certdb.load_cacert(cacert_fname) except ipautil.CalledProcessError, e: logging.critical("Error importing CA cert file named [%s]: %s" % (cacert_fname, str(e))) status = False # restart the directory server self.start() return status def tune_nofile(self, num=8192): """ Increase the number of files descriptors available to directory server from the default 1024 to 8192. This will allow to support a greater number of clients out of the box. """ # check limits.conf need_limits = True fd = open("/etc/security/limits.conf", "r") lines = fd.readlines() fd.close() for line in lines: sline = line.strip() if not sline.startswith(DS_USER): continue if sline.find('nofile') == -1: continue # ok we already have an explicit entry for user/nofile need_limits = False # check sysconfig/dirsrv need_sysconf = True fd = open("/etc/sysconfig/dirsrv", "r") lines = fd.readlines() fd.close() for line in lines: sline = line.strip() if not sline.startswith('ulimit'): continue if sline.find('-n') == -1: continue # ok we already have an explicit entry for file limits need_sysconf = False #if sysconf or limits are set avoid messing up and defer to the admin if need_sysconf and need_limits: self.fstore.backup_file("/etc/security/limits.conf") fd = open("/etc/security/limits.conf", "a+") fd.write('%s\t\t-\tnofile\t\t%s\n' % (DS_USER, str(num))) fd.close() fd = open("/etc/sysconfig/dirsrv", "a+") fd.write('ulimit -n %s\n' % str(num)) fd.close() else: logging.info("Custom file limits are already set! Skipping\n") print "Custom file limits are already set! Skipping\n" return # finally change also DS configuration # NOTE: dirsrv will not allow you to set max file descriptors unless # the user limits allow it, so we have to restart dirsrv before # attempting to change them in cn=config self.__restart_instance() nf_sub_dict = dict(NOFILES=str(num)) self._ldap_mod("ds-nfiles.ldif", nf_sub_dict) def __tuning(self): self.tune_nofile(8192) def __root_autobind(self): self._ldap_mod("root-autobind.ldif") def __add_sudo_binduser(self): self._ldap_mod("sudobind.ldif", self.sub_dict) def replica_populate(self): self.ldap_connect() dn = "cn=default,ou=profile,%s" % self.suffix try: ret = self.admin_conn.search_s(dn, ldap.SCOPE_BASE, '(objectclass=*)')[0] srvlist = ret.data.get('defaultServerList') if len(srvlist) > 0: srvlist = srvlist[0].split() if not self.fqdn in srvlist: srvlist.append(self.fqdn) attr = ' '.join(srvlist) mod = [(ldap.MOD_REPLACE, 'defaultServerList', attr)] self.admin_conn.modify_s(dn, mod) except ldap.NO_SUCH_OBJECT: pass except ldap.TYPE_OR_VALUE_EXISTS: pass self.ldap_disconnect()