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dnsbl.py
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dnsbl.py
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#!/usr/bin/env python3
# Add, remove or query IP addresses in DNSBL zone.
#
# Requires Debian packages: python-dnspython python-tz
import argparse
import sys
import dns.update
import dns.query
import dns.tsigkeyring
import dns.resolver
import dns.zone
import ipaddress
import time
import datetime
import pytz
import _myvars
################## re-written by srulikuk (github.com/srulikuk) ##################
# -- CREDIT TO ORIGINAL AUTHOR -- #
# __author__ = "Niccolo Rigacci" #
# __copyright__ = "Copyright 2020 Niccolo Rigacci <niccolo@rigacci.org>" #
# __license__ = "GPLv3-or-later" #
# __email__ = "niccolo@rigacci.org" #
# __version__ = "0.3.1" #
#________________________________________________________________________________#
# -- Niccolo Rigacci has kindly given permission for this to be distributed -- #
# -- with GPL v2.0 however the "or later version" is optional, not required -- #
##################################################################################
DNSBL_ZONE = (_myvars.DNSBL_ZONE)
DNS_HOSTNAME = (_myvars.DNS_HOSTNAME)
RNDC_KEY = (_myvars.RNDC_KEY)
def parg():
parser = argparse.ArgumentParser(description='Add, remove or query IP addresses in DNSBL zone.')
parser.add_argument(
'-t', choices=['a', 'r', 'q', 'x'],
required=True, action="store", dest="type",
help='a for add - r for remove - q for query'
)
parser.add_argument(
'-i', type=ipaddress.ip_address,
required='-t x' not in sys.argv, action="store", dest="ip",
help='ip address to action'
)
parser.add_argument(
'-tr', required=False, action="store", dest="trap",
help='email address that triggered the trap'
)
parser.add_argument(
'-hs', required=False, action="store", dest="host",
help='host that triggered the trap'
)
parser.add_argument(
'-s', required=False, action="store", dest="sender",
help='host that triggered the trap'
)
args = parser.parse_args()
parg.type = args.type
parg.ip = str(args.ip)
parg.trap = args.trap
parg.host = args.host
parg.sender = args.sender
#---------------------------------------------------------------
#---------------------------------------------------------------
def reverse_address(ip):
if ':' in ip:
ipv6_address = ipaddress.ip_address(ip)
return ipv6_address.reverse_pointer.replace(".ip6.arpa", "")
else:
return '.'.join(reversed(ip.split(".")))
#---------------------------------------------------------------
#---------------------------------------------------------------
def AddDNS(ip, rev_address, trap, host, sender, value='127.0.0.1'):
print('Adding type A record "%s" for %s.%s :' % (value, rev_address, DNSBL_ZONE)),
timestamp = int(time.time())
date = datetime.datetime.fromtimestamp(timestamp, tz=pytz.utc).strftime('%Y-%m-%dZ%H:%M:%S')
keyring = dns.tsigkeyring.from_text(RNDC_KEY)
update = dns.update.Update(DNSBL_ZONE, keyring = keyring, keyalgorithm = 'hmac-md5.sig-alg.reg.int')
update.replace(rev_address, 8600, 'A', value)
update.replace(rev_address, 8600, 'TXT', '"Address %s added at %d (%s)"' % (ip, timestamp, date))
response = dns.query.tcp(update, DNS_HOSTNAME)
if response.rcode() == dns.rcode.NOERROR:
print('NOERROR, Adding to log file')
# write to log file
with open("/var/log/dnsbl_spamtrap.log", "a") as log:
log.write(
'{},IP-BANNED={},TRAP={},SENDER-HOST={},SENDER-EMAIL={}\n'.format(
date,ip,trap,host,sender
)
)
return 0
elif response.rcode() == dns.rcode.REFUSED:
print('REFUSED')
return 1
else:
print('Response: %s' % (response,))
return 2
#---------------------------------------------------------------
#---------------------------------------------------------------
def DeleteDNS(rev_address):
print('Removing type A record %s.%s :' % (rev_address, DNSBL_ZONE)),
keyring = dns.tsigkeyring.from_text(RNDC_KEY)
update = dns.update.Update(DNSBL_ZONE, keyring = keyring, keyalgorithm = 'hmac-md5.sig-alg.reg.int')
update.delete(rev_address, 'A')
update.delete(rev_address, 'TXT')
response = dns.query.tcp(update, DNS_HOSTNAME)
if response.rcode() == dns.rcode.NOERROR:
print('NOERROR')
return 0
elif response.rcode() == dns.rcode.REFUSED:
print('REFUSED')
return 1
else:
print('Response: %s' % (response,))
return 2
#---------------------------------------------------------------
#---------------------------------------------------------------
def QueryDNS(ip, rev_address):
query = rev_address + "." + DNSBL_ZONE
resolver = dns.resolver.Resolver()
resolver.timeout = 8
resolver.lifetime = 8
try:
answers = resolver.query(query, 'A')
a_record = answers[0]
except:
a_record = None
try:
answers = resolver.query(query, 'TXT')
txt_record = answers[0]
except:
txt_record = None
if txt_record != None:
print("Address %s: TXT record for %s.%s => %s" % (ip, rev_address, DNSBL_ZONE, txt_record))
if a_record != None:
print("Address %s: A record for %s.%s => %s" % (ip, rev_address, DNSBL_ZONE, a_record))
return 1
else:
print("Address %s is not listed." % (ip,))
return 0
#---------------------------------------------------------------
#---------------------------------------------------------------
def XfrDNS():
print('===== AXFR from zone %s =====' % (DNSBL_ZONE,))
z = dns.zone.from_xfr(dns.query.xfr(DNS_HOSTNAME, DNSBL_ZONE))
for n in z.nodes.keys():
record = z[n].to_text(n)
if ' IN A 127' in record:
print(record)
return
#---------------------------------------------------------------
#---------------------------------------------------------------
def main():
# create empty vars incase they are not passed in parser
ip = None
trap = None
host = None
sender = None
parg()
type = parg.type
ip = str(parg.ip)
trap = parg.trap
host = parg.host
sender = parg.sender
# address = parg.ip
if type == 'x':
sys.exit(XfrDNS())
rev_address = reverse_address(ip)
if type == 'a':
# address = parg.ip
# rev_address = reverse_address(parg.ip)
sys.exit(AddDNS(ip, rev_address, trap, host, sender))
elif type == 'r':
# address = parg.ip
# rev_address = reverse_address(address)
sys.exit(DeleteDNS(rev_address))
elif type == 'q':
# address = parg.ip
# rev_address = reverse_address(address)
sys.exit(QueryDNS(ip, rev_address))
if __name__ == '__main__':
main()