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dns.nsupdate: Verify added DNS record

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This commit is contained in:
Kishi85 2019-02-15 14:05:26 +01:00
parent dedb08b759
commit 2dbc7302eb
1 changed files with 27 additions and 2 deletions
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29
modes/dns/nsupdate.py
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@ -8,6 +8,7 @@ import datetime
import ipaddress
import re
import socket
import time
import io
import dns
@ -127,6 +128,7 @@ class ChallengeHandler(DNSChallengeHandler):
self.keyalgorithm = config.get("nsupdate_keyalgorithm", DEFAULT_KEY_ALGORITHM)
self.dns_server = config.get("nsupdate_server")
self.dns_ttl = int(config.get("nsupdate_ttl", "60"))
self.dns_verify = config.get("nsupdate_verify", "true") == "true"
def _determine_zone_and_nameserverip(self, domain):
nameserver = self.dns_server
@ -142,10 +144,33 @@ class ChallengeHandler(DNSChallengeHandler):
def add_dns_record(self, domain, txtvalue):
zone, nameserverip = self._determine_zone_and_nameserverip(domain)
update = dns.update.Update(zone, keyring=self.keyring, keyalgorithm=self.keyalgorithm)
update.add(domain, self.dns_ttl, 'TXT', txtvalue)
update.add(domain, self.dns_ttl, dns.rdatatype.TXT, txtvalue)
print('Adding \'{} 60 IN TXT "{}"\' to {}'.format(domain, txtvalue, nameserverip))
dns.query.tcp(update, nameserverip)
return datetime.datetime.now() + datetime.timedelta(seconds=2 * self.dns_ttl)
verified = False
retry = 0
while self.dns_verify and not verified and retry < 5:
request = dns.message.make_query(domain, dns.rdatatype.TXT)
response = dns.query.tcp(request, nameserverip)
for rrset in response.answer:
for answer in rrset:
if answer.to_text().strip('"') == txtvalue:
verified = True
print('Verified \'{} 60 IN TXT "{}"\' on {}'.format(domain,
txtvalue,
nameserverip))
break
if not verified:
time.sleep(1)
retry += 1
if not self.dns_verify or verified:
return datetime.datetime.now() + datetime.timedelta(seconds=2 * self.dns_ttl)
else:
raise ValueError('Failed to verify \'{} 60 IN TXT "{}"\' on {}'.format(domain,
txtvalue,
nameserverip))
def remove_dns_record(self, domain, txtvalue):
zone, nameserverip = self._determine_zone_and_nameserverip(domain)