216 lines
7.0 KiB
Python
216 lines
7.0 KiB
Python
import dns.name
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import dns.zone
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import dns.rdatatype
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import dns.rdataclass
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from .logger import get_logger
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from netbox_dns.models import Zone
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from netbox_dns_bridge.models import IntegerKeyValueSetting, CatalogZoneMemberIdentifier
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from uuid import uuid4
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from base64 import b32encode
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from django.db import transaction, close_old_connections, OperationalError
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LOGGER = get_logger(__name__)
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def init() -> None:
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_init_soa_serial()
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_create_missing_member_identifiers()
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def increment_soa_serial() -> int:
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with transaction.atomic():
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try:
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soa_serial = IntegerKeyValueSetting.objects.select_for_update().get(
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key="catalog-zone-soa-serial"
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)
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new_soa_serial = soa_serial.value + 1
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if new_soa_serial > 0xFFFFFFFF:
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LOGGER.warning(
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f"Catalog serial {soa_serial.value} reached max — wrapping back to 1"
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)
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new_soa_serial = 1
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soa_serial.value = new_soa_serial
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soa_serial.save()
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soa_serial.refresh_from_db()
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LOGGER.debug(f"Catalog zone SOA serial number is now {soa_serial.value}")
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return soa_serial.value
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except OperationalError as e:
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LOGGER.error(
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f"ERROR: Failed to increment the Catalog Zone's SOA serial: {e}"
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)
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close_old_connections()
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def create_zone(name, view_name) -> dns.zone.Zone:
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# Zone origin
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origin = dns.name.from_text(name, dns.name.root)
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# Create a new empty zone
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zone = dns.zone.Zone(origin)
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zone.rdclass = dns.rdataclass.IN
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try:
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# get zones from netbox
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nb_zones = Zone.objects.filter(
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view__name=view_name, active=True
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).select_related("catz_identifier")
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ptr_base = dns.name.from_text("zones", origin)
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for nb_zone in nb_zones:
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ttl = 0
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qname = dns.name.from_text(nb_zone.name, dns.name.root)
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# Create PTR record
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p_name = nb_zone.catz_identifier.name
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ptr_name = dns.name.from_text(p_name, ptr_base)
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if not ptr_name.is_subdomain(origin):
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raise ValueError(
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f"Catalog zone member identifier {ptr_name.to_text()} not a subdomain"
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)
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rdata = dns.rdata.from_text(
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dns.rdataclass.IN, dns.rdatatype.PTR, qname.to_text()
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)
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rdataset = zone.find_rdataset(ptr_name, dns.rdatatype.PTR, create=True)
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rdataset.add(rdata, ttl)
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# Configure DNSSec Policy for member Zone if DNSSec is enabled
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if nb_zone.dnssec_policy:
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rid = dns.name.from_text("group", ptr_name)
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policy_name = nb_zone.dnssec_policy.name.rstrip(" ")
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group_name = f"dnssec-policy-{policy_name}"
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rdata = dns.rdata.from_text(
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dns.rdataclass.IN, dns.rdatatype.TXT, group_name
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)
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rdataset = zone.find_rdataset(rid, dns.rdatatype.TXT, create=True)
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rdataset.add(rdata, ttl)
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zone_root_node = zone.find_node(origin, create=True)
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# SOA record
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soa_rdataset = _create_soa_rdataset()
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zone_root_node.rdatasets.append(soa_rdataset)
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# NS record
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ns_rdataset = _create_ns_rdataset()
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zone_root_node.rdatasets.append(ns_rdataset)
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# version.catz. record
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version_rdataset = _create_version_rdataset()
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zone_version_node = zone.find_node(
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dns.name.from_text("version", origin), create=True
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)
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zone_version_node.rdatasets.append(version_rdataset)
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return zone
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except OperationalError as e:
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LOGGER.error(f"ERROR: Failed to create Catalog Zone: {e}")
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close_old_connections()
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return None
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def _init_soa_serial() -> None:
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try:
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IntegerKeyValueSetting.objects.get(key="catalog-zone-soa-serial")
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LOGGER.info("Catalog zone SOA serial number loaded from database")
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except IntegerKeyValueSetting.DoesNotExist:
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IntegerKeyValueSetting.objects.create(key="catalog-zone-soa-serial", value=1)
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LOGGER.debug(
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"Catalog zone SOA serial number was not set in the database. Set to 1"
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)
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except OperationalError as e:
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LOGGER.error(f"ERROR: Failed to initialize the Catalog Zone's SOA serial: {e}")
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close_old_connections()
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def _generate_member_identifier() -> str:
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return b32encode(uuid4().bytes)[0:26].lower().decode("UTF-8")
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def update_member_identifier(zone: Zone) -> None:
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try:
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CatalogZoneMemberIdentifier.objects.update_or_create(
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zone=zone,
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defaults={"name": _generate_member_identifier()},
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)
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except OperationalError as e:
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LOGGER.error(f"ERROR: Failed to update Catalog Zone member identifier: {e}")
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close_old_connections()
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def _create_missing_member_identifiers() -> None:
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try:
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existing_zone_ids = CatalogZoneMemberIdentifier.objects.values_list(
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"zone_id", flat=True
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)
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missing_zones = Zone.objects.exclude(id__in=existing_zone_ids)
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new_objects = [
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CatalogZoneMemberIdentifier(
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zone=zone,
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name=_generate_member_identifier(),
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)
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for zone in missing_zones
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]
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for identifier in new_objects:
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LOGGER.debug(
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f"Zone {identifier.zone} missing catz member identifier. Creating..."
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)
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CatalogZoneMemberIdentifier.objects.bulk_create(
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new_objects,
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ignore_conflicts=False,
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)
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except OperationalError as e:
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LOGGER.error(f"ERROR: Could not create catz member identifier: {e}")
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close_old_connections()
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def _create_soa_rdataset() -> dns.rdataset:
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try:
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serial = IntegerKeyValueSetting.objects.get(key="catalog-zone-soa-serial").value
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# SOA Record components
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ttl = 0
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rclass = dns.rdataclass.IN
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rtype = dns.rdatatype.SOA
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# Create SOA rdata object
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rdata = dns.rdata.from_text(
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rclass,
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rtype,
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f"invalid. invalid. {serial} 60 10 1209600 0",
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)
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# Create Rdataset and add the RDATA to it
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rdataset = dns.rdataset.Rdataset(rclass, rtype)
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rdataset.add(rdata, ttl)
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return rdataset
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except OperationalError as e:
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LOGGER.error(f"ERROR: Failed to access catz SOA record in database: {e}")
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close_old_connections()
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def _create_ns_rdataset() -> dns.rdataset:
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# NS record for catz.
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name = dns.name.from_text("invalid", dns.name.root)
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rdata = dns.rdata.from_text(dns.rdataclass.IN, dns.rdatatype.NS, str(name))
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rdataset = dns.rdataset.Rdataset(dns.rdataclass.IN, dns.rdatatype.NS)
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rdataset.add(rdata, 0)
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return rdataset
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def _create_version_rdataset() -> dns.rdataset:
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rdata = dns.rdata.from_text(dns.rdataclass.IN, dns.rdatatype.TXT, '"2"')
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rdataset = dns.rdataset.Rdataset(dns.rdataclass.IN, dns.rdatatype.TXT)
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rdataset.add(rdata, 0)
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return rdataset
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