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# SPDX-License-Identifier: AGPL-3.0-or-later
"""Configuration helper for BIND server."""
import pathlib
import re
from collections import defaultdict
from pathlib import Path
import augeas
from plinth import action_utils
from plinth.actions import privileged
CONFIG_FILE = '/etc/bind/named.conf.options'
ZONES_DIR = '/var/bind/pri'
DEFAULT_CONFIG = '''
acl goodclients {
localnets;
};
options {
listen-on { !10.42.0.1; !10.42.1.1; !10.42.2.1; !10.42.3.1; !10.42.4.1; !10.42.5.1; !10.42.6.1; !10.42.7.1; any; };
directory "/var/cache/bind";
recursion yes;
allow-query { goodclients; };
forwarders {
127.0.0.53;
};
forward first;
auth-nxdomain no; # conform to RFC1035
listen-on-v6 { any; };
};
''' # noqa: E501
DEFAULT_FORWARDER = '127.0.0.53' # systemd-resolved
LISTEN_ON = 'listen-on { !10.42.0.1; !10.42.1.1; !10.42.2.1; !10.42.3.1; '\
'!10.42.4.1; !10.42.5.1; !10.42.6.1; !10.42.7.1; any; };'
@privileged
def setup(old_version: int):
"""Setup BIND configuration."""
if old_version == 0:
with open(CONFIG_FILE, 'w', encoding='utf-8') as conf_file:
conf_file.write(DEFAULT_CONFIG)
elif old_version < 4:
if not get_config()['forwarders']:
_set_forwarders(DEFAULT_FORWARDER)
if not _has_listen_on():
_insert_listen_on()
if old_version < 3:
_remove_dnssec()
Path(ZONES_DIR).mkdir(exist_ok=True, parents=True)
action_utils.service_try_restart('named')
@privileged
def configure(forwarders: str):
"""Configure BIND."""
_set_forwarders(forwarders)
action_utils.service_try_restart('named')
def get_config():
"""Get current configuration."""
data = [line.strip() for line in open(CONFIG_FILE, 'r', encoding='utf-8')]
forwarders = ''
flag = False
for line in data:
if re.match(r'^\s*forwarders\s+{', line):
flag = True
elif flag and '//' not in line:
forwarders = re.sub('[;]', '', line)
flag = False
return {'forwarders': forwarders}
def _set_forwarders(forwarders):
"""Set DNS forwarders."""
flag = 0
data = [line.strip() for line in open(CONFIG_FILE, 'r', encoding='utf-8')]
conf_file = open(CONFIG_FILE, 'w', encoding='utf-8')
for line in data:
if re.match(r'^\s*forwarders\s+{', line):
conf_file.write(line + '\n')
for dns in forwarders.split():
conf_file.write(dns + '; ')
conf_file.write('\n')
flag = 1
elif '};' in line and flag == 1:
conf_file.write(line + '\n')
flag = 0
elif flag == 0:
conf_file.write(line + '\n')
conf_file.close()
def _remove_dnssec():
"""Remove DNSSEC options."""
data = [line.strip() for line in open(CONFIG_FILE, 'r', encoding='utf-8')]
with open(CONFIG_FILE, 'w', encoding='utf-8') as file_handle:
for line in data:
if not re.match(r'^\s*dnssec-enable\s+yes;', line):
file_handle.write(line + '\n')
def _has_listen_on():
"""Return whether listen-on config option is present."""
lines = pathlib.Path(CONFIG_FILE).read_text().splitlines()
regex = r'^\s*listen-on\s+{'
return any((re.match(regex, line) for line in lines))
def _insert_listen_on():
"""Insert the listen-on option."""
config_file = pathlib.Path(CONFIG_FILE)
lines = config_file.read_text().splitlines(keepends=True)
write_lines = []
for line in lines:
write_lines += line
if re.match(r'^\s*options\s+{', line):
write_lines += LISTEN_ON + '\n'
config_file.write_text(''.join(write_lines))
def get_served_domains():
"""Return list of domains service handles.
Augeas path for zone files:
===========================
augtool> print /files/var/bind/pri/local.zone
/files/var/bind/pri/local.zone
/files/var/bind/pri/local.zone/$TTL = "604800"
/files/var/bind/pri/local.zone/@[1]
/files/var/bind/pri/local.zone/@[1]/1
/files/var/bind/pri/local.zone/@[1]/1/class = "IN"
/files/var/bind/pri/local.zone/@[1]/1/type = "SOA"
/files/var/bind/pri/local.zone/@[1]/1/mname = "localhost."
/files/var/bind/pri/local.zone/@[1]/1/rname = "root.localhost."
/files/var/bind/pri/local.zone/@[1]/1/serial = "2"
/files/var/bind/pri/local.zone/@[1]/1/refresh = "604800"
/files/var/bind/pri/local.zone/@[1]/1/retry = "86400"
/files/var/bind/pri/local.zone/@[1]/1/expiry = "2419200"
/files/var/bind/pri/local.zone/@[1]/1/minimum = "604800"
/files/var/bind/pri/local.zone/@[2]
/files/var/bind/pri/local.zone/@[2]/1
/files/var/bind/pri/local.zone/@[2]/1/class = "IN"
/files/var/bind/pri/local.zone/@[2]/1/type = "NS"
/files/var/bind/pri/local.zone/@[2]/1/rdata = "localhost."
/files/var/bind/pri/local.zone/@[3]
/files/var/bind/pri/local.zone/@[3]/1
/files/var/bind/pri/local.zone/@[3]/1/class = "IN"
/files/var/bind/pri/local.zone/@[3]/1/type = "A"
/files/var/bind/pri/local.zone/@[3]/1/rdata = "127.0.0.1"
/files/var/bind/pri/local.zone/@[4]
/files/var/bind/pri/local.zone/@[4]/1
/files/var/bind/pri/local.zone/@[4]/1/class = "IN"
/files/var/bind/pri/local.zone/@[4]/1/type = "AAAA"
/files/var/bind/pri/local.zone/@[4]/1/rdata = "::1"
Need to find the related functionality to parse the A records
Retrieve from /etc/bind/db* zone files all the configured A records.
Assuming zones files in ZONES_DIR are all used.
:return: dictionary in the form 'domain_name': ['ip_address', 'ipv6_addr']
"""
RECORD_TYPES = ('A', 'AAAA')
aug = augeas.Augeas(flags=augeas.Augeas.NO_LOAD +
augeas.Augeas.NO_MODL_AUTOLOAD)
aug.set('/augeas/load/Dns_Zone/lens', 'Dns_Zone.lns')
zone_file_path = Path(ZONES_DIR)
zone_files = [zf for zf in zone_file_path.iterdir() if zf.is_file()]
# augeas load only required files
for zone_file in zone_files:
aug.set('/augeas/load/Dns_Zone/incl[last() + 1]', str(zone_file))
aug.load()
served_domains = defaultdict(list)
for zone_file in zone_files:
base_path = '/files/%s/@[{record_order}]/1/{field}' % zone_file
count = 1
mname = aug.get(base_path.format(record_order=count, field='mname'))
while True:
record_type = aug.get(
base_path.format(record_order=count, field='type'))
# no record type ends the search
if record_type is None:
break
if record_type in RECORD_TYPES:
served_domains[mname].append(
aug.get(base_path.format(record_order=count,
field='rdata')))
count += 1
return served_domains
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