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add principal functionality to act as hidden master

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github@kiekerjan.isdronken.nl 2021-05-18 22:51:29 +02:00
parent 8b13a3b177
commit b9e7175d9f
1 changed files with 42 additions and 13 deletions
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55
management/dns_update.py
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@ -145,13 +145,20 @@ def build_zone(domain, all_domains, additional_records, www_redirect_domains, en
# 'False' in the tuple indicates these records would not be used if the zone
# is managed outside of the box.
if is_zone:
# Obligatory definition of ns1.PRIMARY_HOSTNAME.
records.append((None, "NS", "ns1.%s." % env["PRIMARY_HOSTNAME"], False))
# Define ns2.PRIMARY_HOSTNAME or whatever the user overrides.
# User may provide one or more additional nameservers
secondary_ns_list = get_secondary_dns(additional_records, mode="NS") \
or ["ns2." + env["PRIMARY_HOSTNAME"]]
secondary_ns_list = get_secondary_dns(additional_records, mode="NS")
# Need at least two nameservers in the secondary dns list
useHiddenMaster = os.path.exists("/etc/usehiddenmasterdns") and len(secondary_ns_list) > 1
if not useHiddenMaster:
# Obligatory definition of ns1.PRIMARY_HOSTNAME.
records.append((None, "NS", "ns1.%s." % env["PRIMARY_HOSTNAME"], False))
if len(secondary_ns_list) == 0:
secondary_ns_list = ["ns2." + env["PRIMARY_HOSTNAME"]]
for secondary_ns in secondary_ns_list:
records.append((None, "NS", secondary_ns+'.', False))
@ -466,15 +473,29 @@ def write_nsd_zone(domain, zonefile, records, env, force):
# For the refresh through TTL fields, a good reference is:
# http://www.peerwisdom.org/2013/05/15/dns-understanding-the-soa-record/
# Time To Refresh – How long in seconds a nameserver should wait prior to checking for a Serial Number
# increase within the primary zone file. An increased Serial Number means a transfer is needed to sync
# your records. Only applies to zones using secondary DNS.
# Time To Retry – How long in seconds a nameserver should wait prior to retrying to update a zone after
# a failed attempt. Only applies to zones using secondary DNS.
# Time To Expire – How long in seconds a nameserver should wait prior to considering data from a secondary
# zone invalid and stop answering queries for that zone. Only applies to zones using secondary DNS.
# Minimum TTL – How long in seconds that a nameserver or resolver should cache a negative response.
# To make use of hidden master initialize the DNS to be used as secondary DNS. Then change the following
# in the zone file:
# - Name the secondary DNS server as primary DNS in the SOA record
# - Do not add NS records for the Mail-in-a-Box server
zone = """
$ORIGIN {domain}.
$TTL {defttl} ; default time to live
@ IN SOA ns1.{primary_domain}. hostmaster.{primary_domain}. (
@ IN SOA {primary_dns}. hostmaster.{primary_domain}. (
__SERIAL__ ; serial number
{refresh} ; Refresh (secondary nameserver update interval)
{refresh} ; Refresh (secondary nameserver update interval)
{retry} ; Retry (when refresh fails, how often to try again)
{expire} ; Expire (when refresh fails, how long secondary nameserver will keep records around anyway)
{negttl} ; Negative TTL (how long negative responses are cached)
@ -484,20 +505,28 @@ $TTL {defttl} ; default time to live
# Default ttl values
p_defttl = 86400
p_refresh = 7200
p_retry = 3600
p_retry = 1800
p_expire = 1209600
p_negttl = 86400
primary_dns = "ns1" + env["PRIMARY_HOSTNAME"]
# Shorten dns ttl if file exists. Use just before moving domains, changin secondary dns servers etc
if os.path.exists("/etc/forceshortdnsttl"):
p_defttl = 300
p_refresh = 3600
p_retry = 1800
p_retry = 900
p_expire = 43200
p_negttl = 3600
p_negttl = 300
secondary_ns_list = get_secondary_dns(additional_records, mode="NS")
useHiddenMaster = os.path.exists("/etc/usehiddenmasterdns") and len(secondary_ns_list) > 1
if useHiddenMaster:
primary_dns = secondary_ns_list[0]
# Replace replacement strings.
zone = zone.format(domain=domain, primary_domain=env["PRIMARY_HOSTNAME"], defttl=p_defttl,
zone = zone.format(domain=domain, primary_dns=primary_dns, primary_domain=env["PRIMARY_HOSTNAME"], defttl=p_defttl,
refresh=p_refresh, retry=p_retry, expire=p_expire, negttl=p_negttl)
# Add records.
@ -1027,7 +1056,7 @@ def get_custom_dns_records(custom_dns, qname, rtype):
def build_recommended_dns(env):
ret = []
for (domain, zonefile, records) in build_zones(env):
# remove records that we don't dislay
# remove records that we don't display
records = [r for r in records if r[3] is not False]
# put Required at the top, then Recommended, then everythiing else