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add hacky potentially working zone transfers #1

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5 changes: 4 additions & 1 deletion ct_backend/settings/dns.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,9 @@
DNS_BASE_DOMAIN = os.environ.get('DNS_BASE_DOMAIN', ".")
DNS_CONTAINER_DOMAIN = os.environ.get('DNS_CONTAINER_DOMAIN', ".")
DNS_MIRROR_SERVER = os.environ.get('DNS_MIRROR_SERVER', "").strip()
DNS_ALLOW_TRANSFER = os.environ.get('DNS_ALLOW_TRANSFER', "").strip()
print("forwarding requests to: %s" % DNS_MIRROR_SERVER)
if DNS_MIRROR_SERVER == "":
DNS_MIRROR_SERVER = None
DNS_MIRROR_SERVER = None
if DNS_ALLOW_TRANSFER == "":
DNS_ALLOW_TRANSFER = None
26 changes: 25 additions & 1 deletion dns/server.py
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,7 @@
import sys
import os
import json
import ipaddress
from datetime import datetime

os.environ.setdefault("DJANGO_SETTINGS_MODULE", "ct_backend.settings")
Expand Down Expand Up @@ -42,7 +43,30 @@ def resolve(self, request, handler):
qtype = request.q.qtype

suffix = DNSLabel(self.origin)
if str(qname.label[-len(suffix.label):]).lower() == str(suffix.label).lower():
if request.q.qtype == QTYPE.AXFR and settings.DNS_ALLOW_TRANSFER and ipaddress.ip_address(handler.client_address[0]) in ipaddress.ip_network(settings.DNS_ALLOW_TRANSFER):
rrs = []

now = datetime.now()
soatime = now.strftime('%y%j')+"%05d"%(now.hour*3600+now.minute*60+now.second)
rrs += RR.fromZone(f"{self.origin} 60 IN SOA {settings.DNS_BASE_DOMAIN} non-exist.{settings.DNS_BASE_DOMAIN} {soatime} 900 900 1800 60")

for extra in ZoneExtra.objects.all():
rrs += RR.fromZone(extra.entry)
for dyn in DynamicEntry.objects.all():
rrs += RR.fromZone(dyn.combined)
for cts in Container.objects.all():
for ip in ct.ip_set.all():
if ip.is_ipv4:
rrs += RR(qname, QTYPE.A, ttl=self.ttl, rdata=A(ip.ip))
elif ip.siit_ip.exists():
rrs += RR(qname, QTYPE.A, ttl=self.ttl, rdata=A(ip.siit_ip.first().ip))
else:
rrs += RR(qname, QTYPE.AAAA, ttl=self.ttl, rdata=AAAA(ip.ip))

rrs += RR.fromZone(f"{self.origin} 60 IN SOA {settings.DNS_BASE_DOMAIN} non-exist.{settings.DNS_BASE_DOMAIN} {soatime} 900 900 1800 60")

reply.add_answer(*rrs)
elif str(qname.label[-len(suffix.label):]).lower() == str(suffix.label).lower():
rem = DNSLabel(qname.label[:-len(suffix.label)])
print("queries for :", rem, qtype)

Expand Down