# # Copyright (C) 2017 FreeIPA Contributors see COPYING for license # """ AD trust installer module """ from __future__ import print_function, absolute_import import logging import os import six from ipalib.constants import MIN_DOMAIN_LEVEL from ipalib import create_api, rpc from ipalib import errors from ipalib.install.service import ServiceAdminInstallInterface from ipalib.install.service import replica_install_only from ipaplatform.paths import paths from ipapython.admintool import ScriptError from ipapython import ipaldap, ipautil from ipapython.dn import DN from ipapython.install.core import group, knob from ipaserver.install import installutils from ipaserver.install import adtrustinstance from ipaserver.install import service from ipaserver.install.plugins.adtrust import update_host_cifs_keytabs from ipaserver.install.bindinstance import dns_zone_exists from ipaserver.dns_data_management import IPASystemRecords if six.PY3: unicode = str logger = logging.getLogger(__name__) netbios_name = None reset_netbios_name = False def netbios_name_error(name): logger.error("\nIllegal NetBIOS name [%s].\n", name) logger.error( "Up to 15 characters and only uppercase ASCII letters, digits " "and dashes are allowed. Empty string is not allowed.") def read_netbios_name(netbios_default): netbios_name = "" print("Enter the NetBIOS name for the IPA domain.") print("Only up to 15 uppercase ASCII letters, digits " "and dashes are allowed.") print("Example: EXAMPLE.") print("") print("") if not netbios_default: netbios_default = "EXAMPLE" while True: netbios_name = ipautil.user_input( "NetBIOS domain name", netbios_default, allow_empty=False) print("") if adtrustinstance.check_netbios_name(netbios_name): break netbios_name_error(netbios_name) return netbios_name def retrieve_netbios_name(api): flat_name_attr = 'ipantflatname' try: entry = api.Backend.ldap2.get_entry( DN(('cn', api.env.domain), api.env.container_cifsdomains, ipautil.realm_to_suffix(api.env.realm)), [flat_name_attr]) except errors.NotFound: # trust not configured logger.debug("No previous trust configuration found") return None else: return entry.get(flat_name_attr)[0] def set_and_check_netbios_name(netbios_name, unattended, api): """ Depending on whether a trust is already configured or not, the passed NetBIOS domain name must be handled differently. If trust is not configured, the given NetBIOS is used. The NetBIOS is generated if none was given on the command line. If trust is already configured, the given NetBIOS name is used to reset the stored NetBIOS name in case it differs from the current one. """ cur_netbios_name = None gen_netbios_name = None reset_netbios_name = False if api.Backend.ldap2.isconnected(): cur_netbios_name = retrieve_netbios_name(api) else: logger.debug( "LDAP is not connected, can not retrieve NetBIOS name") if cur_netbios_name and not netbios_name: # keep the current NetBIOS name netbios_name = cur_netbios_name reset_netbios_name = False elif cur_netbios_name and cur_netbios_name != netbios_name: # change the NetBIOS name print("Current NetBIOS domain name is %s, new name is %s.\n" % (cur_netbios_name, netbios_name)) print("Please note that changing the NetBIOS name might " "break existing trust relationships.") if unattended: reset_netbios_name = True print("NetBIOS domain name will be changed to %s.\n" % netbios_name) else: print("Say 'yes' if the NetBIOS shall be changed and " "'no' if the old one shall be kept.") reset_netbios_name = ipautil.user_input( 'Do you want to reset the NetBIOS domain name?', default=False, allow_empty=False) if not reset_netbios_name: netbios_name = cur_netbios_name elif cur_netbios_name and cur_netbios_name == netbios_name: # keep the current NetBIOS name reset_netbios_name = False elif not cur_netbios_name: if not netbios_name: gen_netbios_name = adtrustinstance.make_netbios_name( api.env.domain) if gen_netbios_name is not None: # Fix existing trust configuration print("Trust is configured but no NetBIOS domain name found, " "setting it now.") reset_netbios_name = True else: # initial trust configuration reset_netbios_name = False else: # all possible cases should be covered above raise Exception('Unexpected state while checking NetBIOS domain name') if unattended and netbios_name is None and gen_netbios_name: netbios_name = gen_netbios_name if not adtrustinstance.check_netbios_name(netbios_name): if unattended: netbios_name_error(netbios_name) raise ScriptError("Aborting installation.") else: if netbios_name: netbios_name_error(netbios_name) netbios_name = None if not unattended and not netbios_name: netbios_name = read_netbios_name(gen_netbios_name) return (netbios_name, reset_netbios_name) def enable_compat_tree(): print("Do you want to enable support for trusted domains in Schema " "Compatibility plugin?") print("This will allow clients older than SSSD 1.9 and non-Linux " "clients to work with trusted users.") print("") enable_compat = ipautil.user_input( "Enable trusted domains support in slapi-nis?", default=False, allow_empty=False) print("") return enable_compat def check_for_installed_deps(): # Check if samba packages are installed if not adtrustinstance.check_inst(): raise ScriptError("Aborting installation.") def retrieve_entries_without_sid(api): """ Retrieve a list of entries without assigned SIDs. :returns: a list of entries or an empty list if an error occurs """ # The filter corresponds to ipa_sidgen_task.c LDAP search filter filter = '(&(objectclass=ipaobject)(!(objectclass=mepmanagedentry))' \ '(|(objectclass=posixaccount)(objectclass=posixgroup)' \ '(objectclass=ipaidobject))(!(ipantsecurityidentifier=*)))' base_dn = api.env.basedn try: logger.debug( "Searching for objects with missing SID with " "filter=%s, base_dn=%s", filter, base_dn) entries, _truncated = api.Backend.ldap2.find_entries( filter=filter, base_dn=base_dn, attrs_list=['']) return entries except errors.NotFound: # All objects have SIDs assigned pass except (errors.DatabaseError, errors.NetworkError) as e: logger.error( "Could not retrieve a list of objects that need a SID " "identifier assigned: %s", e) return [] def retrieve_and_ask_about_sids(api, options): entries = [] if api.Backend.ldap2.isconnected(): entries = retrieve_entries_without_sid(api) else: logger.debug( "LDAP backend not connected, can not retrieve entries " "with missing SID") object_count = len(entries) if object_count > 0: print("") print("WARNING: %d existing users or groups do not have " "a SID identifier assigned." % len(entries)) print("Installer can run a task to have ipa-sidgen " "Directory Server plugin generate") print("the SID identifier for all these users. Please note, " "in case of a high") print("number of users and groups, the operation might " "lead to high replication") print("traffic and performance degradation. Refer to " "ipa-adtrust-install(1) man page") print("for details.") print("") if options.unattended: print("Unattended mode was selected, installer will " "NOT run ipa-sidgen task!") else: if ipautil.user_input( "Do you want to run the ipa-sidgen task?", default=False, allow_empty=False): options.add_sids = True def retrieve_potential_adtrust_agents(api): """ Retrieve a sorted list of potential AD trust agents :param api: initialized API instance :returns: sorted list of FQDNs of masters which are not AD trust agents """ try: # Search only masters which have support for domain levels # because only these masters will have SSSD recent enough # to support AD trust agents dl_enabled_masters = api.Command.server_find( ipamindomainlevel=MIN_DOMAIN_LEVEL, all=True)['result'] except (errors.DatabaseError, errors.NetworkError) as e: logger.error( "Could not retrieve a list of existing IPA masters: %s", e) return None try: # search for existing AD trust agents adtrust_agents = api.Command.server_find( servrole=u'AD trust agent', all=True)['result'] except (errors.DatabaseError, errors.NetworkError) as e: logger.error("Could not retrieve a list of adtrust agents: %s", e) return None dl_enabled_master_cns = {m['cn'][0] for m in dl_enabled_masters} adtrust_agents_cns = {m['cn'][0] for m in adtrust_agents} potential_agents_cns = dl_enabled_master_cns - adtrust_agents_cns # remove the local host from the potential agents since it will be set up # by adtrustinstance configuration code potential_agents_cns -= {api.env.host} return sorted(potential_agents_cns) def add_hosts_to_adtrust_agents(api, host_list): """ Add the CIFS and host principals to the 'adtrust agents' group as 389-ds only operates with GroupOfNames, we have to use the principal's proper dn as defined in self.cifs_agent :param api: API instance :param host_list: list of potential AD trust agent FQDNs """ agents_dn = DN( ('cn', 'adtrust agents'), api.env.container_sysaccounts, api.env.basedn) service.add_principals_to_group( api.Backend.ldap2, agents_dn, "member", [api.Object.host.get_dn(x) for x in host_list]) def add_new_adtrust_agents(api, options): """ Find out IPA masters which are not part of the cn=adtrust agents and propose them to be added to the list :param api: API instance :param options: parsed CLI options """ potential_agents_cns = retrieve_potential_adtrust_agents(api) if potential_agents_cns: print("") print("WARNING: %d IPA masters are not yet able to serve " "information about users from trusted forests." % len(potential_agents_cns)) print("Installer can add them to the list of IPA masters " "allowed to access information about trusts.") print("If you choose to do so, you also need to restart " "LDAP service on those masters.") print("Refer to ipa-adtrust-install(1) man page for details.") print("") if options.unattended: print("Unattended mode was selected, installer will NOT " "add other IPA masters to the list of allowed to") print("access information about trusted forests!") return new_agents = [] for name in sorted(potential_agents_cns): if ipautil.user_input( "IPA master [%s]?" % (name), default=False, allow_empty=False): new_agents.append(name) if new_agents: add_hosts_to_adtrust_agents(api, new_agents) # The method trust_enable_agent was added on API version 2.236 # Specifically request this version in the remote call kwargs = {u'version': u'2.236', u'enable_compat': options.enable_compat} failed_agents = [] for agent in new_agents: # Try to run the ipa-trust-enable-agent script on the agent # If the agent is too old and does not support this, # print a msg logger.info("Execute trust_enable_agent on remote server %s", agent) client = None try: xmlrpc_uri = 'https://{}/ipa/xml'.format( ipautil.format_netloc(agent)) remote_api = create_api(mode=None) remote_api.bootstrap(context='installer', confdir=paths.ETC_IPA, xmlrpc_uri=xmlrpc_uri, fallback=False) client = rpc.jsonclient(remote_api) client.finalize() client.connect() result = client.forward( u'trust_enable_agent', ipautil.fsdecode(agent), **kwargs) except errors.CommandError as e: logger.debug( "Remote server %s does not support agent enablement " "over RPC: %s", agent, e) failed_agents.append(agent) except (errors.PublicError, ConnectionRefusedError) as e: logger.debug( "Remote call to trust_enable_agent failed on server %s: " "%s", agent, e) failed_agents.append(agent) else: for message in result.get('messages'): logger.debug('%s', message['message']) if not int(result['result']): logger.debug( "ipa-trust-enable-agent returned non-zero exit code " " on server %s", agent) failed_agents.append(agent) finally: if client and client.isconnected(): client.disconnect() # if enablement failed on some agents, print a WARNING: if failed_agents: if options.enable_compat: print(""" WARNING: you MUST manually enable the Schema compatibility Plugin and """) print(""" WARNING: you MUST restart (both "ipactl restart" and "systemctl restart sssd") the following IPA masters in order to activate them to serve information about users from trusted forests: """) for x in failed_agents: print(x) def install_check(standalone, options, api): global netbios_name global reset_netbios_name if not standalone: check_for_installed_deps() realm_not_matching_domain = (api.env.domain.upper() != api.env.realm) if realm_not_matching_domain: print("WARNING: Realm name does not match the domain name.\n" "You will not be able to establish trusts with Active " "Directory unless\nthe realm name of the IPA server matches its " "domain name.\n\n") if not options.unattended: if not ipautil.user_input("Do you wish to continue?", default=False, allow_empty=False): raise ScriptError("Aborting installation.") # Check if /etc/samba/smb.conf already exists. In case it was not generated # by IPA, print a warning that we will break existing configuration. if adtrustinstance.ipa_smb_conf_exists(): if not options.unattended: print("IPA generated smb.conf detected.") if not ipautil.user_input("Overwrite smb.conf?", default=False, allow_empty=False): raise ScriptError("Aborting installation.") elif os.path.exists(paths.SMB_CONF): print("WARNING: The smb.conf already exists. Running " "ipa-adtrust-install will break your existing samba " "configuration.\n\n") if not options.unattended: if not ipautil.user_input("Do you wish to continue?", default=False, allow_empty=False): raise ScriptError("Aborting installation.") if not options.unattended and not options.enable_compat: options.enable_compat = enable_compat_tree() netbios_name, reset_netbios_name = set_and_check_netbios_name( options.netbios_name, options.unattended, api) if not options.add_sids: retrieve_and_ask_about_sids(api, options) def install(standalone, options, fstore, api): if not options.unattended and standalone: print("") print("The following operations may take some minutes to complete.") print("Please wait until the prompt is returned.") print("") smb = adtrustinstance.ADTRUSTInstance(fstore) smb.realm = api.env.realm smb.autobind = ipaldap.AUTOBIND_ENABLED smb.setup(api.env.host, api.env.realm, netbios_name, reset_netbios_name, options.rid_base, options.secondary_rid_base, options.add_sids, enable_compat=options.enable_compat) smb.find_local_id_range() smb.create_instance() # Update Samba keytab with host keys ad_update = update_host_cifs_keytabs(api) if ad_update: result = ad_update() # this particular update does not require restarting DS but # the plugin might require that in future if result[0]: logger.debug('Restarting directory server to apply updates') installutils.restart_dirsrv() if options.add_agents: # Find out IPA masters which are not part of the cn=adtrust agents # and propose them to be added to the list add_new_adtrust_agents(api, options) def generate_dns_service_records_help(api): """ Return list of instructions to create DNS service records for Windows if in case DNS is not enabled and the DNS zone is not managed by IPA. In case IPA manages the DNS zone, nothing is returned. """ zone = api.env.domain err_msg = [] ret = api.Command['dns_is_enabled']() if not ret['result']: err_msg.append("DNS management was not enabled at install time.") else: if not dns_zone_exists(zone): err_msg.append( "DNS zone %s cannot be managed as it is not defined in " "IPA" % zone) if err_msg: err_msg.append("Add the following service records to your DNS " "server for DNS zone %s: " % zone) system_records = IPASystemRecords(api, all_servers=True) adtrust_records = system_records.get_base_records( [api.env.host], ["AD trust controller"], include_master_role=False, include_kerberos_realm=False) for r_name, node in adtrust_records.items(): for rec in IPASystemRecords.records_list_from_node(r_name, node): err_msg.append(rec) return err_msg return None @group class ADTrustInstallInterface(ServiceAdminInstallInterface): """ Interface for the AD trust installer Knobs defined here will be available in: * ipa-server-install * ipa-replica-install * ipa-adtrust-install """ description = "AD trust" # the following knobs are provided on top of those specified for # admin credentials add_sids = knob( None, description="Add SIDs for existing users and groups as the final step" ) add_agents = knob( None, description="Add IPA masters to a list of hosts allowed to " "serve information about users from trusted forests" ) add_agents = replica_install_only(add_agents) enable_compat = knob( None, description="Enable support for trusted domains for old clients" ) netbios_name = knob( str, None, description="NetBIOS name of the IPA domain" ) no_msdcs = knob( None, description="Deprecated: has no effect", deprecated=True ) rid_base = knob( int, 1000, description="Start value for mapping UIDs and GIDs to RIDs" ) secondary_rid_base = knob( int, 100000000, description="Start value of the secondary range for mapping " "UIDs and GIDs to RIDs" )