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# Authors: Simo Sorce <ssorce@redhat.com> # # 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 <http://www.gnu.org/licenses/>. # from __future__ import absolute_import from __future__ import print_function import logging import tempfile import os import pwd import netaddr import re import sys import time import dns.resolver import ldap import six from ipaserver.dns_data_management import ( IPASystemRecords, IPADomainIsNotManagedByIPAError, ) from ipaserver.install import installutils from ipaserver.install import service from ipaserver.install import sysupgrade from ipapython import ipautil from ipapython import dnsutil from ipapython.dnsutil import DNSName from ipapython.dn import DN from ipapython.admintool import ScriptError import ipalib from ipalib import api, errors from ipalib.constants import IPA_CA_RECORD from ipaplatform import services from ipaplatform.constants import constants from ipaplatform.paths import paths from ipalib.util import (validate_zonemgr_str, normalize_zonemgr, get_dns_forward_zone_update_policy, get_dns_reverse_zone_update_policy, normalize_zone, get_reverse_zone_default, zone_is_reverse, validate_dnssec_global_forwarder, DNSSECSignatureMissingError, EDNS0UnsupportedError, UnresolvableRecordError) if six.PY3: unicode = str logger = logging.getLogger(__name__) NAMED_CONF = paths.NAMED_CONF RESOLV_CONF = paths.RESOLV_CONF named_conf_section_ipa_start_re = re.compile('\s*dyndb\s+"ipa"\s+"[^"]+"\s+{') named_conf_section_options_start_re = re.compile('\s*options\s+{') named_conf_section_end_re = re.compile('};') named_conf_arg_ipa_re = re.compile( r'(?P<indent>\s*)(?P<name>\S+)\s"(?P<value>[^"]+)";') named_conf_arg_options_re = re.compile( r'(?P<indent>\s*)(?P<name>\S+)\s+"(?P<value>[^"]+)"\s*;') named_conf_arg_ipa_template = "%(indent)s%(name)s \"%(value)s\";\n" named_conf_arg_options_template = "%(indent)s%(name)s \"%(value)s\";\n" # non string args for options section named_conf_arg_options_re_nonstr = re.compile( r'(?P<indent>\s*)(?P<name>\S+)\s+(?P<value>[^"]+)\s*;') named_conf_arg_options_template_nonstr = "%(indent)s%(name)s %(value)s;\n" # include directive named_conf_include_re = re.compile(r'\s*include\s+"(?P<path>)"\s*;') named_conf_include_template = "include \"%(path)s\";\n" def create_reverse(): return ipautil.user_input( "Do you want to search for missing reverse zones?", True ) def named_conf_exists(): try: with open(NAMED_CONF, 'r') as named_fd: lines = named_fd.readlines() except IOError: return False for line in lines: if named_conf_section_ipa_start_re.match(line): return True return False NAMED_SECTION_OPTIONS = "options" NAMED_SECTION_IPA = "ipa" def named_conf_get_directive(name, section=NAMED_SECTION_IPA, str_val=True): """Get a configuration option in bind-dyndb-ldap section of named.conf :str_val - set to True if directive value is string (only for NAMED_SECTION_OPTIONS) """ if section == NAMED_SECTION_IPA: named_conf_section_start_re = named_conf_section_ipa_start_re named_conf_arg_re = named_conf_arg_ipa_re elif section == NAMED_SECTION_OPTIONS: named_conf_section_start_re = named_conf_section_options_start_re if str_val: named_conf_arg_re = named_conf_arg_options_re else: named_conf_arg_re = named_conf_arg_options_re_nonstr else: raise NotImplementedError('Section "%s" is not supported' % section) with open(NAMED_CONF, 'r') as f: target_section = False for line in f: if named_conf_section_start_re.match(line): target_section = True continue if named_conf_section_end_re.match(line): if target_section: break if target_section: match = named_conf_arg_re.match(line) if match and name == match.group('name'): return match.group('value') def named_conf_set_directive(name, value, section=NAMED_SECTION_IPA, str_val=True): """ Set configuration option in bind-dyndb-ldap section of named.conf. When the configuration option with given name does not exist, it is added at the end of ipa section in named.conf. If the value is set to None, the configuration option is removed from named.conf. :str_val - set to True if directive value is string (only for NAMED_SECTION_OPTIONS) """ new_lines = [] if section == NAMED_SECTION_IPA: named_conf_section_start_re = named_conf_section_ipa_start_re named_conf_arg_re = named_conf_arg_ipa_re named_conf_arg_template = named_conf_arg_ipa_template elif section == NAMED_SECTION_OPTIONS: named_conf_section_start_re = named_conf_section_options_start_re if str_val: named_conf_arg_re = named_conf_arg_options_re named_conf_arg_template = named_conf_arg_options_template else: named_conf_arg_re = named_conf_arg_options_re_nonstr named_conf_arg_template = named_conf_arg_options_template_nonstr else: raise NotImplementedError('Section "%s" is not supported' % section) with open(NAMED_CONF, 'r') as f: target_section = False matched = False last_indent = "\t" for line in f: if named_conf_section_start_re.match(line): target_section = True if named_conf_section_end_re.match(line): if target_section and not matched and \ value is not None: # create a new conf new_conf = named_conf_arg_template \ % dict(indent=last_indent, name=name, value=value) new_lines.append(new_conf) target_section = False if target_section and not matched: match = named_conf_arg_re.match(line) if match: last_indent = match.group('indent') if name == match.group('name'): matched = True if value is not None: if not isinstance(value, six.string_types): value = str(value) new_conf = named_conf_arg_template \ % dict(indent=last_indent, name=name, value=value) new_lines.append(new_conf) continue new_lines.append(line) # write new configuration with open(NAMED_CONF, 'w') as f: f.write("".join(new_lines)) def named_conf_include_exists(path): """ Check if include exists in named.conf :param path: path in include directive :return: True if include exists, else False """ with open(NAMED_CONF, 'r') as f: for line in f: match = named_conf_include_re.match(line) if match and path == match.group('path'): return True return False def named_conf_add_include(path): """ append include at the end of file :param path: path to be insert to include directive """ with open(NAMED_CONF, 'a') as f: f.write(named_conf_include_template % {'path': path}) def dns_container_exists(suffix): """ Test whether the dns container exists. """ assert isinstance(suffix, DN) return api.Backend.ldap2.entry_exists(DN(('cn', 'dns'), suffix)) def dns_zone_exists(name, api=api): try: zone = api.Command.dnszone_show(unicode(name)) except ipalib.errors.NotFound: return False if len(zone) == 0: return False else: return True def get_reverse_record_name(zone, ip_address): ip = netaddr.IPAddress(ip_address) rev = '.' + normalize_zone(zone) fullrev = '.' + normalize_zone(ip.reverse_dns) if not fullrev.endswith(rev): raise ValueError("IP address does not match reverse zone") return fullrev[1:-len(rev)] def verify_reverse_zone(zone, ip_address): try: get_reverse_record_name(zone, ip_address) except ValueError: return False return True def find_reverse_zone(ip_address, api=api): ip = netaddr.IPAddress(ip_address) zone = normalize_zone(ip.reverse_dns) while len(zone) > 0: if dns_zone_exists(zone, api): return zone zone = zone.partition('.')[2] return None def read_reverse_zone(default, ip_address, allow_zone_overlap=False): while True: zone = ipautil.user_input("Please specify the reverse zone name", default=default) if not zone: return None if not verify_reverse_zone(zone, ip_address): logger.error("Invalid reverse zone %s for IP address %s", zone, ip_address) continue if not allow_zone_overlap: try: dnsutil.check_zone_overlap(zone, raise_on_error=False) except ValueError as e: logger.error("Reverse zone %s will not be used: %s", zone, e) continue break return normalize_zone(zone) def get_auto_reverse_zones(ip_addresses): auto_zones = [] for ip in ip_addresses: if ipautil.reverse_record_exists(ip): # PTR exist there is no reason to create reverse zone logger.info("Reverse record for IP address %s already exists", ip) continue default_reverse = get_reverse_zone_default(ip) try: dnsutil.check_zone_overlap(default_reverse) except ValueError: logger.info("Reverse zone %s for IP address %s already exists", default_reverse, ip) continue auto_zones.append((ip, default_reverse)) return auto_zones def add_zone(name, zonemgr=None, dns_backup=None, ns_hostname=None, update_policy=None, force=False, skip_overlap_check=False, api=api): # always normalize zones name = normalize_zone(name) if update_policy is None: if zone_is_reverse(name): update_policy = get_dns_reverse_zone_update_policy(api.env.realm, name) else: update_policy = get_dns_forward_zone_update_policy(api.env.realm) if zonemgr is None: zonemgr = 'hostmaster.%s' % name if ns_hostname: ns_hostname = normalize_zone(ns_hostname) ns_hostname = unicode(ns_hostname) try: api.Command.dnszone_add(unicode(name), idnssoamname=ns_hostname, idnssoarname=unicode(zonemgr), idnsallowdynupdate=True, idnsupdatepolicy=unicode(update_policy), idnsallowquery=u'any', idnsallowtransfer=u'none', skip_overlap_check=skip_overlap_check, force=force) except (errors.DuplicateEntry, errors.EmptyModlist): pass def add_rr(zone, name, type, rdata, dns_backup=None, api=api, **kwargs): addkw = { '%srecord' % str(type.lower()) : unicode(rdata) } addkw.update(kwargs) try: api.Command.dnsrecord_add(unicode(zone), unicode(name), **addkw) except (errors.DuplicateEntry, errors.EmptyModlist): pass if dns_backup: dns_backup.add(zone, type, name, rdata) def add_fwd_rr(zone, host, ip_address, api=api): addr = netaddr.IPAddress(ip_address) if addr.version == 4: add_rr(zone, host, "A", ip_address, None, api) elif addr.version == 6: add_rr(zone, host, "AAAA", ip_address, None, api) def add_ptr_rr(zone, ip_address, fqdn, dns_backup=None, api=api): name = get_reverse_record_name(zone, ip_address) add_rr(zone, name, "PTR", normalize_zone(fqdn), dns_backup, api) def add_ns_rr(zone, hostname, dns_backup=None, force=True, api=api): hostname = normalize_zone(hostname) add_rr(zone, "@", "NS", hostname, dns_backup=dns_backup, force=force, api=api) def del_rr(zone, name, type, rdata, api=api): delkw = { '%srecord' % str(type.lower()) : unicode(rdata) } try: api.Command.dnsrecord_del(unicode(zone), unicode(name), **delkw) except (errors.NotFound, errors.AttrValueNotFound, errors.EmptyModlist): pass def del_fwd_rr(zone, host, ip_address, api=api): addr = netaddr.IPAddress(ip_address) if addr.version == 4: del_rr(zone, host, "A", ip_address, api=api) elif addr.version == 6: del_rr(zone, host, "AAAA", ip_address, api=api) def del_ns_rr(zone, name, rdata, api=api): del_rr(zone, name, 'NS', rdata, api=api) def get_rr(zone, name, type, api=api): rectype = '%srecord' % unicode(type.lower()) ret = api.Command.dnsrecord_find(unicode(zone), unicode(name)) if ret['count'] > 0: for r in ret['result']: if rectype in r: return r[rectype] return [] def get_fwd_rr(zone, host, api=api): return [x for t in ("A", "AAAA") for x in get_rr(zone, host, t, api)] def zonemgr_callback(option, opt_str, value, parser): """ Properly validate and convert --zonemgr Option to IA5String """ if value is not None: # validate the value first try: # IDNA support requires unicode encoding = getattr(sys.stdin, 'encoding', None) if encoding is None: encoding = 'utf-8' # value is of a string type in both py2 and py3 if not isinstance(value, unicode): value = value.decode(encoding) validate_zonemgr_str(value) except ValueError as e: # FIXME we can do this in better way # https://fedorahosted.org/freeipa/ticket/4804 # decode to proper stderr encoding stderr_encoding = getattr(sys.stderr, 'encoding', None) if stderr_encoding is None: stderr_encoding = 'utf-8' error = unicode(e).encode(stderr_encoding) parser.error(b"invalid zonemgr: " + error) parser.values.zonemgr = value def check_reverse_zones(ip_addresses, reverse_zones, options, unattended, search_reverse_zones=False): checked_reverse_zones = [] if (not options.no_reverse and not reverse_zones and not options.auto_reverse): if unattended: options.no_reverse = True else: options.no_reverse = not create_reverse() # shortcut if options.no_reverse: return [] # verify zones passed in options for rz in reverse_zones: # isn't the zone managed by someone else if not options.allow_zone_overlap: try: dnsutil.check_zone_overlap(rz) except ValueError as e: msg = "Reverse zone %s will not be used: %s" % (rz, e) if unattended: raise ScriptError(msg) else: logger.warning('%s', msg) continue checked_reverse_zones.append(normalize_zone(rz)) # check that there is reverse zone for every IP ips_missing_reverse = [] for ip in ip_addresses: if search_reverse_zones and find_reverse_zone(str(ip)): # reverse zone is already in LDAP continue for rz in checked_reverse_zones: if verify_reverse_zone(rz, ip): # reverse zone was entered by user break else: ips_missing_reverse.append(ip) # create reverse zone for IP addresses that does not have one for (ip, rz) in get_auto_reverse_zones(ips_missing_reverse): if options.auto_reverse: logger.info("Reverse zone %s will be created", rz) checked_reverse_zones.append(rz) elif unattended: logger.warning("Missing reverse record for IP address %s", ip) else: if ipautil.user_input("Do you want to create reverse zone for IP " "%s" % ip, True): rz = read_reverse_zone(rz, str(ip), options.allow_zone_overlap) checked_reverse_zones.append(rz) return checked_reverse_zones def check_forwarders(dns_forwarders): print("Checking DNS forwarders, please wait ...") forwarders_dnssec_valid = True for forwarder in dns_forwarders: logger.debug("Checking DNS server: %s", forwarder) try: validate_dnssec_global_forwarder(forwarder) except DNSSECSignatureMissingError as e: forwarders_dnssec_valid = False logger.warning("DNS server %s does not support DNSSEC: %s", forwarder, e) logger.warning("Please fix forwarder configuration to enable " "DNSSEC support.\n" "(For BIND 9 add directive \"dnssec-enable yes;\" " "to \"options {}\")") print("DNS server %s: %s" % (forwarder, e)) print("Please fix forwarder configuration to enable DNSSEC support.") print("(For BIND 9 add directive \"dnssec-enable yes;\" to \"options {}\")") except EDNS0UnsupportedError as e: forwarders_dnssec_valid = False logger.warning("DNS server %s does not support ENDS0 " "(RFC 6891): %s", forwarder, e) logger.warning("Please fix forwarder configuration. " "DNSSEC support cannot be enabled without EDNS0") print(("WARNING: DNS server %s does not support EDNS0 " "(RFC 6891): %s" % (forwarder, e))) except UnresolvableRecordError as e: logger.error("DNS server %s: %s", forwarder, e) raise RuntimeError("DNS server %s: %s" % (forwarder, e)) return forwarders_dnssec_valid def remove_master_dns_records(hostname, realm): bind = BindInstance() bind.remove_master_dns_records(hostname, realm, realm.lower()) bind.remove_server_ns_records(hostname) def ensure_dnsserver_container_exists(ldap, api_instance, logger=logger): """ Create cn=servers,cn=dns,$SUFFIX container. If logger is not None, emit a message that the container already exists when DuplicateEntry is raised """ entry = ldap.make_entry( DN(api_instance.env.container_dnsservers, api_instance.env.basedn), { u'objectclass': [u'top', u'nsContainer'], u'cn': [u'servers'] } ) try: ldap.add_entry(entry) except errors.DuplicateEntry: logger.debug('cn=servers,cn=dns container already exists') class DnsBackup(object): def __init__(self, service): self.service = service self.zones = {} def add(self, zone, record_type, host, rdata): """ Backup a DNS record in the file store so it can later be removed. """ if zone not in self.zones: zone_id = len(self.zones) self.zones[zone] = (zone_id, 0) self.service.backup_state("dns_zone_%s" % zone_id, zone) (zone_id, record_id) = self.zones[zone] self.service.backup_state("dns_record_%s_%s" % (zone_id, record_id), "%s %s %s" % (record_type, host, rdata)) self.zones[zone] = (zone_id, record_id + 1) def clear_records(self, have_ldap): """ Remove all records from the file store. If we are connected to ldap, we will also remove them there. """ i = 0 while True: zone = self.service.restore_state("dns_zone_%s" % i) if not zone: return j = 0 while True: dns_record = self.service.restore_state("dns_record_%s_%s" % (i, j)) if not dns_record: break if have_ldap: type, host, rdata = dns_record.split(" ", 2) try: delkw = { '%srecord' % str(type.lower()) : unicode(rdata) } api.Command.dnsrecord_del(unicode(zone), unicode(host), **delkw) except Exception: pass j += 1 i += 1 class BindInstance(service.Service): def __init__(self, fstore=None, api=api): super(BindInstance, self).__init__( "named", service_desc="DNS", fstore=fstore, api=api, service_user=constants.NAMED_USER, service_prefix=u'DNS', keytab=paths.NAMED_KEYTAB ) self.dns_backup = DnsBackup(self) self.domain = None self.host = None self.ip_addresses = [] self.forwarders = None self.sub_dict = None self.reverse_zones = [] self.named_regular = services.service('named-regular', api) suffix = ipautil.dn_attribute_property('_suffix') def setup(self, fqdn, ip_addresses, realm_name, domain_name, forwarders, forward_policy, reverse_zones, named_user=constants.NAMED_USER, zonemgr=None, no_dnssec_validation=False): self.service_user = named_user self.fqdn = fqdn self.ip_addresses = ip_addresses self.realm = realm_name self.domain = domain_name self.forwarders = forwarders self.forward_policy = forward_policy self.host = fqdn.split(".")[0] self.suffix = ipautil.realm_to_suffix(self.realm) self.reverse_zones = reverse_zones self.no_dnssec_validation=no_dnssec_validation if not zonemgr: self.zonemgr = 'hostmaster.%s' % normalize_zone(self.domain) else: self.zonemgr = normalize_zonemgr(zonemgr) self.first_instance = not dns_container_exists(self.suffix) self.__setup_sub_dict() @property def host_domain(self): return self.fqdn.split(".", 1)[1] @property def host_in_rr(self): # when a host is not in a default domain, it needs to be referred # with FQDN and not in a domain-relative host name if not self.host_in_default_domain(): return normalize_zone(self.fqdn) return self.host def host_in_default_domain(self): return normalize_zone(self.host_domain) == normalize_zone(self.domain) def create_file_with_system_records(self): system_records = IPASystemRecords(self.api) text = u'\n'.join( IPASystemRecords.records_list_from_zone( system_records.get_base_records() ) ) with tempfile.NamedTemporaryFile( mode="w", prefix="ipa.system.records.", suffix=".db", delete=False ) as f: f.write(text) print("Please add records in this file to your DNS system:", f.name) def create_instance(self): try: self.stop() except Exception: pass


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