-
Notifications
You must be signed in to change notification settings - Fork 11
/
Copy pathcheck-dnsbl.py
executable file
·555 lines (484 loc) · 28.1 KB
/
check-dnsbl.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
#!/usr/bin/env python3
# 2016, Georg Sauthoff <[email protected]>, GPLv3+
import argparse
import csv
# require dnspython >= 1.15
# because of: https://github.com/rthalley/dnspython/issues/206
import dns.resolver
import dns.reversename
import itertools
import logging
import re
import sys
import time
ipv6_incapable = { 'bl.0spam.org', 'rbl.0spam.org', 'nbl.0spam.org' }
default_blacklists = [
('zen.spamhaus.org' , 'Spamhaus SBL, XBL and PBL' , 'https://www.spamhaus.org' ),
('truncate.gbudb.net' , 'Exclusively Spam/Malware' , 'http://www.gbudb.com/truncate/' ),
# accepts de-listing payments, overblocking
# https://en.wikipedia.org/w/index.php?title=Comparison_of_DNS_blacklists&oldid=1169665628#Suspect_RBL_providers
('dnsbl-1.uceprotect.net' , 'Trapserver Cluster' , 'https://www.uceprotect.net' ),
('psbl.surriel.com' , 'passive list, easy to unlist' , 'https://psbl.org' ),
('db.wpbl.info' , 'Weighted private' , 'http://wpbl.info' ),
('bl.spamcop.net' , 'Based on spamcop users' , 'https://www.spamcop.net' ),
# spamrats doesn't serve DNS servers of hosting providers such as hetzner
('dyna.spamrats.com' , 'Dynamic IP addresses' , 'https://www.spamrats.com/' ),
('spam.spamrats.com' , 'Manual submissions' , 'https://www.spamrats.com/' ),
('auth.spamrats.com' , 'Suspicious authentications' , 'https://www.spamrats.com/' ),
('bl.blocklist.de' , 'fail2ban reports etc.' , 'https://www.blocklist.de' ),
('all.s5h.net' , 'traps' , 'https://www.usenix.org.uk/content/rbl.html'),
('b.barracudacentral.org' , 'traps' , 'http://www.barracudacentral.org/rbl'),
# also returns white-listed entries with return code 127.0.0.1
('hostkarma.junkemailfilter.com', 'Autotected Virus Senders' , 'https://wiki.junkemailfilter.com'),
('bl.0spam.org' , 'Main 0spam DNSBL' , 'https://0spam.org' ),
('rbl.0spam.org' , 'Main 0spam realtime BL' , 'https://0spam.org' ),
('nbl.0spam.org' , '0spam network BL' , 'https://0spam.org' ),
('bl.nordspam.com' , 'NordSpam IP addresses' , 'https://www.nordspam.com/usage/' ),
# doesn't list 127.0.0.2 RFC 5782 mandatory test entry
('combined.mail.abusix.zone' , 'Abusix aggregated' , 'https://abu.sx/combined' ),
# seems to include dnsbl-1.uceprotect.net
('black.dnsbl.brukalai.lt' , 'Brukalai.lt junk mail' , 'https://www.brukalai.lt' ),
('light.dnsbl.brukalai.lt' , 'Brukalai.lt abuse' , 'https://www.brukalai.lt' ),
('bip.virusfree.cz' , 'botnet IP addresses' , 'https://www.virusfree.cz/en/' ),
('bad.virusfree.cz' , 'high spam rate/malware senders' , 'https://www.virusfree.cz/en/' ),
('rbl.mailspike.org' , 'whatever' , 'https://mailspike.org' ),
('rbl.metunet.com' , 'whatever' , 'https://rbl.metunet.com' ),
('all.spam-rbl.fr' , 'French DNSBL' , 'https://spam-rbl.fr/rbl.php' ),
('bl.drmx.org' , 'traps and provider feedback' , 'http://drmx.org/' ),
('bl.spameatingmonkey.net' , 'traps and policy' , 'https://spameatingmonkey.com/services'),
('backscatter.spameatingmonkey.net', 'backscatter to traps' , 'https://spameatingmonkey.com/services'),
('bl.ipv6.spameatingmonkey.net', 'traps and policy for ipv6' , 'https://spameatingmonkey.com/services'),
('netbl.spameatingmonkey.net', 'low reputation networks' , 'https://spameatingmonkey.com/services'),
('bogons.cymru.com' , 'unallocated netblocks' , 'https://www.team-cymru.com/bogon-networks'),
('combined.rbl.msrbl.net' , 'traps, virus scanners etc.' , 'https://www.msrbl.com' ),
('dnsbl.justspam.org' , 'whatever' , 'http://www.justspam.org/usage' ),
('dnsbl.madavi.de' , 'website comment spam' , 'https://www.madavi.de/madavibl/' ),
('dnsbl.rv-soft.info' , 'whatever from czech repuplic' , 'http://dnsbl.rv-soft.info' ),
('dnsbl.zapbl.net' , 'traps and admin choice' , 'https://zapbl.net/using' ),
# doesn't list 127.0.0.2 RFC 5782 mandatory test entry
('dnsrbl.swinog.ch' , 'traps' , 'https://antispam.imp.ch' ),
('spamrbl.swinog.ch' , 'IP addresses included in spam' , 'https://antispam.imp.ch' ),
('korea.services.net' , 'korean networks minus whitelisted' , 'http://korea.services.net' ),
('mail-abuse.blacklist.jippg.org', 'whatever from japan' , 'http://blacklist.jippg.org' ),
('rbl.blockedservers.com' , 'whatever' , 'https://www.blockedservers.com' ),
('spam.rbl.blockedservers.com' , 'whatever' , 'https://www.blockedservers.com' ),
('netscan.rbl.blockedservers.com', 'whatever' , 'https://www.blockedservers.com' ),
('torexit.rbl.blockedservers.com', 'whatever' , 'https://www.blockedservers.com' ),
# doesn't list 127.0.0.2 RFC 5782 mandatory test entry
('pofon.foobar.hu' , 'the fast-expiration spambot-network DNSBL', 'https://rbl.foobar.hu' ),
('rbl.abuse.ro' , 'spamtraps' , 'https://abuse.ro' ),
('pbl.abuse.ro' , 'spamtraps' , 'https://abuse.ro' ),
('rbl.efnetrbl.org' , 'BL for IRC servers' , 'https://rbl.efnetrbl.org' ),
('rbl.schulte.org' , 'personal blocklist' , 'https://rbl.schulte.org' ),
('spam.dnsbl.anonmails.de' , 'whatever' , 'https://anonmails.de/dnsbl.php' ),
('spam.pedantic.org' , 'personal blocklist' , 'http://pedantic.org' ),
('spamsources.fabel.dk' , 'whatever' , 'https://www.spamsources.fabel.dk'),
('tor.dan.me.uk' , 'tor nodes - exit and others' , 'https://www.dan.me.uk/dnsbl' ),
('torexit.dan.me.uk' , 'tor exit nodes' , 'https://www.dan.me.uk/dnsbl' ),
('bl.scientificspam.net' , 'scientifc spam specific traps' , 'https://www.scientificspam.net' ),
('bl.suomispam.net' , 'finish language spam' , 'https://suomispam.net' ),
('gl.suomispam.net' , 'finish language spam - gray list' , 'https://suomispam.net' ),
('dnsblchile.org' , 'whatever from chile' , 'https://www.dnsblchile.org' ),
('free.v4bl.org' , 'whatever' , 'https://v4bl.org' ),
# Spanish academic and research network
('weak.dnsbl.rediris.es' , 'traps and aggregation with other lists', 'https://www.rediris.es/irisrbl/'),
('strong.dnsbl.rediris.es' , 'traps and aggregation with other lists', 'https://www.rediris.es/irisrbl/'),
('singular.ttk.pte.hu' , 'traps, stats and user reports' , 'https://singular.ttk.pte.hu/en/' ),
('bl.nosolicitado.org' , 'whatever' , 'https://www.nosolicitado.org' ),
('bl.worst.nosolicitado.org' , 'whatever' , 'https://www.nosolicitado.org' ),
('dnsbl.beetjevreemd.nl' , 'personal curated blocklist' , 'https://www.beetjevreemd.nl/dnsbl/'),
('dnsbl.dronebl.org' , 'whatever' , 'https://dronebl.org' ),
('ip4.bl.zenrbl.pl' , 'some polish bl' , 'https://multirbl.valli.org/detail/ip4.bl.zenrbl.pl.html'),
# offer paid list removal ($ 50)
# https://www.mailcleaner.net/support/request-removal-from-mailcleaner-uribl/
('iprbl.mailcleaner.net' , 'whatever' , 'https://multirbl.valli.org/detail/iprbl.mailcleaner.net.html'),
('rbl.interserver.net' , 'whatever' , 'http://rbl.interserver.net/usage.php'),
('rbl.ircbl.org' , 'IRC abuse blacklist' , 'https://ircbl.org/about' ),
('rbl.rbldns.ru' , 'some russian blocklist' , 'http://rbldns.ru/index.php/en/technical-recommendations.html'),
('reputation-ip.rbl.scrolloutf1.com', 'whatever' , 'http://www.scrolloutf1.com/rbl' ),
('bl.fmb.la' , 'whatever' , 'https://fmb.la/pages/about' ),
('bl.rbl.polspam.pl' , 'some polish blacklist' , 'https://polspam.pl/rbll.php' ),
('bl6.rbl.polspam.pl' , 'some polish blacklist' , 'https://polspam.pl/rbll.php' ),
('nsbl.ascams.com' , 'whatever' , 'https://ascams.com/info/dnsbl-ascams-com/'),
('bl.octopusdns.com' , 'whatever' , 'https://octopusrbl.monster/' ),
('dnsbl.calivent.com.pe' , 'some peruan blacklist' , 'http://dnsbl.calivent.com.pe' ),
('openproxy.bls.digibase.ca' , 'whatever' , 'http://bls.digibase.ca/DNSBL' ),
('proxyabuse.bls.digibase.ca' , 'whatever' , 'http://bls.digibase.ca/DNSBL' ),
('spambot.bls.digibase.ca' , 'whatever' , 'http://bls.digibase.ca/DNSBL' ),
('bl.mxrbl.com' , 'whatever' , 'https://mxrbl.com' ),
]
# blacklists disabled by default because they return mostly garbage
garbage_blacklists = [
# The spfbl.net operator doesn't publish clear criteria that lead to a
# blacklisting.
# When an IP address is blacklisted the operator can't name a specific
# reason for the blacklisting. The blacklisting details page just names
# overly generic reasons like:
# 'This IP was flagged due to misconfiguration of the e-mail service or
# the suspicion that there is no MTA at it.'
# When contacting the operator's support, they can't back up such
# claims.
# There are additions of IP addresses to the spfbl.net blacklist that
# have a properly configured MTA running and that aren't listed in any
# other blacklist. Likely, those additions are caused by a bug in the
# spfbl.net update process. But their support is uninterested in
# improving that process. Instead they want to externalize maintenance
# work by asking listed parties to waste some time on their manual
# delisting process.
# Suspiciously, you can even whitelist your listed address via
# transferring $ 1.50 via PayPal. Go figure.
# Thus, the value of querying this blacklist is utterly low as
# you get false-positive results, very likely.
('dnsbl.spfbl.net' , 'Reputation Database' ),
# offers paid delisting, violates RFC 5782 by listing 127.0.0.1 test entry
# and NOT listing 127.0.0.2 ...
# seems to be a fraudulent operation:
# https://www.spamhaus.org/organization/statement/008/fraudulent-fake-dnsbl-uncovered-nszones.com
('bl.nszones.com' , 'dynamic IP addresses etc.' ),
# references outdated contact information
# DNSBL contains stale entries/false positives
# doesn't list 127.0.0.2 RFC 5782 mandatory test entry
('vote.drbl.gremlin.ru' , 'distributed blacklist' ),
# doesn't list 127.0.0.2 RFC 5782 mandatory test entry
('work.drbl.gremlin.ru' , 'distributed blacklist aggregation'),
# unclear what the listing criteria are, no information given on listed entries,
# unprofessional website in general
('netblockbl.spamgrouper.to' , 'bad networks' , 'http://www.spamgrouper.to' ),
]
# See also:
# https://en.wikipedia.org/wiki/DNSBL
# https://tools.ietf.org/html/rfc5782
# https://en.wikipedia.org/wiki/Comparison_of_DNS_blacklists
# some lists provide detailed stats, i.e. the actual listed addresses
# useful for testing
default_domain_blacklists = [
('dbl.spamhaus.org', 'Spamhaus DBL', 'https://www.spamhaus.org/dbl/'),
('hostkarma.junkemailfilter.com', 'Hostkarma DBL', 'https://wiki.junkemailfilter.com/index.php/Spam_DNS_Lists#Name_Based_Lookups'),
('dbl.0spam.org' , '0spam URLBL' , 'https://0spam.org' ),
('dbl.nordspam.com', 'NordPM URIBL', 'https://www.nordspam.com/usage/'),
('dblack.mail.abusix.zone', 'Abusix URIBL', 'https://abu.sx/dblack' ),
('black.dnsbl.brukalai.lt', 'Brukalai also lists domains', 'https://www.brukalai.lt'),
('uribl.spameatingmonkey.net', 'Spameatingmonkey URIBL', 'https://spameatingmonkey.com/services'),
('urired.spameatingmonkey.net', 'Spameatingmonkey likely URIBL (includes uribl)', 'https://spameatingmonkey.com/services'),
('rhsbl.zapbl.net' , 'whatever', 'https://zapbl.net/using'),
('uribl.swinog.ch' , 'realtime URL blacklist', 'https://antispam.imp.ch'),
('uribl.pofon.foobar.hu', 'URIBL', 'https://rbl.foobar.hu' ),
('uribl.abuse.ro' , 'spamvertized domains', 'https://abuse.ro' ),
('dbl.abuse.ro' , 'spam sending domains', 'https://abuse.ro' ),
('rhsbl.scientificspam.net', 'whatever', 'https://www.scientificspam.net'),
('dbl.suomispam.net', 'Finish DBL', 'https://suomispam.net'),
# offer paid list removal ($ 50)
# https://www.mailcleaner.net/support/request-removal-from-mailcleaner-uribl/
('uribl.mailcleaner.net', 'Pay for removal URIBL', 'https://multirbl.valli.org/detail/uribl.mailcleaner.net.html'),
('rbluri.interserver.net', 'whatever', 'http://rbl.interserver.net/usage.php'),
('bl-domain.rbl.scrolloutf1.com', 'whatever', 'http://www.scrolloutf1.com/rbl'),
('UnsafeSenders.rbl.scrolloutf1.com', 'whatever', 'http://www.scrolloutf1.com/rbl'),
('bl.fmb.la', 'BL also contains domains', 'https://fmb.la/pages/about'),
('short.fmb.la', 'URL shortener domain', 'https://fmb.la/pages/about'),
('rhsbl.rbl.polspam.pl', 'Polish DBL', 'https://polspam.pl/rbll.php'),
('rhsbl-h.rbl.polspam.pl', 'Polish URIBL', 'https://polspam.pl/rbll.php'),
('rhsbl-v.rbl.polspam.pl', 'Polish URIBL for suspicious URI', 'https://polspam.pl/rbll.php'),
('rhsbl-danger.rbl.polspam.pl', 'Polish DBL of dangerous domains', 'https://polspam.pl/rbll.php'),
]
log_format = '%(asctime)s - %(levelname)-8s - %(message)s [%(name)s]'
log_date_format = '%Y-%m-%d %H:%M:%S'
## Simple Setup
# Note that the basicConfig() call is a NOP in Jupyter
# because Jupyter calls it before
logging.basicConfig(format=log_format, datefmt=log_date_format, level=logging.ERROR)
log = logging.getLogger(__name__)
def mk_arg_parser():
p = argparse.ArgumentParser(
formatter_class=argparse.RawDescriptionHelpFormatter,
description = 'Check if mailservers are in any blacklist (DNSBL)',
epilog='''Don't panic if a server is listed in some blacklist.
See also https://en.wikipedia.org/wiki/Comparison_of_DNS_blacklists for the
mechanics and policies of the different lists.
2016, Georg Sauthoff <[email protected]>, GPLv3+''')
p.add_argument('dests', metavar='DESTINATION', nargs='*',
help = 'servers, a MX lookup is done if it is a domain')
p.add_argument('--bl', action='append', default=[],
help='add another blacklist')
p.add_argument('--bl-file', help='read more DNSBL from a CSV file')
p.add_argument('--clear', action='store_true',
help='clear default list of DNSBL')
# https://blog.cloudflare.com/dns-resolver-1-1-1-1/
p.add_argument('--cloudflare', action='store_true',
help="use Cloudflare's public DNS nameservers")
p.add_argument('--debug', action='store_true',
help='print debug log messages')
p.add_argument('--verbose', '-v', action='store_true',
help='print warnings')
# cf. https://en.wikipedia.org/wiki/Google_Public_DNS
p.add_argument('--google', action='store_true',
help="use Google's public DNS nameservers")
p.add_argument('--rev', action='store_true', default=True,
help='check reverse DNS record for each domain (default: on)')
p.add_argument('--mx', action='store_true', default=True,
help='try to folow MX entries')
p.add_argument('--address', action='store_true', default=True,
help='check IP addresses against IP DNSBL (default: on)')
p.add_argument('--domain', action='store_true', default=True,
help='check domains also against DBLS (default: on)')
p.add_argument('--no-mx', dest='mx', action='store_false',
help='ignore any MX records')
p.add_argument('--no-rev', action='store_false', dest='rev',
help='disable reverse DNS checking')
p.add_argument('--no-domain', action='store_false', dest='domain',
help='disable DBL checking')
p.add_argument('--no-address', action='store_false', dest='address',
help='disable IP address blacklist checking')
p.add_argument('--ns', action='append', default=[],
help='use one or more alternate nameserverse')
# cf. https://en.wikipedia.org/wiki/OpenDNS
p.add_argument('--opendns', action='store_true',
help="use Cisco's public DNS nameservers")
# cf. https://quad9.net/faq/
p.add_argument('--quad9', action='store_true',
help="use Quad9's public DNS nameservers (i.e. the filtering ones)")
p.add_argument('--retries', type=int, default=5,
help='Number of retries if request times out (default: 5)')
p.add_argument('--with-garbage', action='store_true',
help=('also include low-quality blacklists that are maintained'
' by clueless operators and thus easily return false-positives'))
p.add_argument('--check-lists', action='store_true',
help='check lists for mandatory RFC 5782 test entries')
return p
def parse_args(*a):
p = mk_arg_parser()
args = p.parse_args(*a)
args.bls = default_blacklists
args.dbls = default_domain_blacklists
if args.clear:
args.bls = []
for bl in args.bl:
args.bls.append((bl, ''))
if args.bl_file:
args.bls = args.bls + read_csv_bl(args.bl_file)
if args.with_garbage:
args.bls.extend(garbage_blacklists)
if args.google:
args.ns = args.ns + ['8.8.8.8', '2001:4860:4860::8888', '8.8.4.4', '2001:4860:4860::8844']
if args.opendns:
args.ns = args.ns + ['208.67.222.222', '2620:0:ccc::2', '208.67.220.220', '2620:0:ccd::2']
if args.cloudflare:
args.ns += ['1.1.1.1', '2606:4700:4700::1111', '1.0.0.1', '2606:4700:4700::1001']
if args.quad9:
args.ns += ['9.9.9.9', '2620:fe::fe', '149.112.112.112', '2620:fe::9']
if args.ns:
dns.resolver.default_resolver = dns.resolver.Resolver(configure=False)
dns.resolver.default_resolver.nameservers = args.ns
if args.debug:
l = logging.getLogger() # root logger
l.setLevel(logging.DEBUG)
elif args.verbose:
l = logging.getLogger() # root logger
l.setLevel(logging.INFO)
if not args.dests and not args.check_lists:
raise RuntimeError('supply either destinations or --check-lists')
return args
def read_csv_bl(filename):
with open(filename, newline='') as f:
reader = csv.reader(f)
xs = [ row for row in reader
if len(row) > 0 and not row[0].startswith('#') ]
return xs
v4_ex = re.compile('^[.0-9]+$')
v6_ex = re.compile('^[:0-9a-fA-F]+$')
def get_addrs(dest, mx=True):
if v4_ex.match(dest) or v6_ex.match(dest):
return [ (dest, None) ], []
domains = [ dest ]
ds = [ dest ]
if mx:
try:
r = dns.resolver.resolve(dest, 'mx', search=False)
domains = [ answer.exchange for answer in r ]
ds.extend(domains)
log.debug('destinatin {} has MXs: {}'
.format(dest, ', '.join([str(d) for d in domains])))
except dns.resolver.NoAnswer:
pass
addrs = []
for domain in domains:
for t in ['a', 'aaaa']:
try:
r = dns.resolver.resolve(domain, t, search=False)
except dns.resolver.NoAnswer:
continue
xs = [ ( answer.address, domain ) for answer in r ]
addrs = addrs + xs
log.debug('domain {} has addresses: {}'
.format(domain, ', '.join([x[0] for x in xs])))
if not addrs:
raise ValueError("There isn't any a/aaaa DNS record for {}".format(domain))
return addrs, ds
def check_dbl(domain, bl):
t = str(domain)
if t.endswith('.'):
d = t + bl
else:
d = f'{t}.{bl}'
try:
v = dns.resolver.resolve(d, 'a', search=False)
except (dns.resolver.NXDOMAIN, dns.resolver.NoNameservers, dns.resolver.NoAnswer):
return None
try:
w = dns.resolver.resolve(d, 'txt', search=False)
except (dns.resolver.NXDOMAIN, dns.resolver.NoNameservers, dns.resolver.NoAnswer):
w = []
s = ','.join(f'{a} ({t})' for a, t in itertools.zip_longest(v, w, fillvalue=''))
m = f'OMG, {domain} is listed in DBL {bl}: {s}'
return m
def check_dnsbl(addr, bl):
rev = dns.reversename.from_address(addr)
domain = str(rev.split(3)[0]) + '.' + bl
try:
r = dns.resolver.resolve(domain, 'a', search=False)
except (dns.resolver.NXDOMAIN, dns.resolver.NoNameservers, dns.resolver.NoAnswer):
return None
address = list(r)[0].address
try:
r = dns.resolver.resolve(domain, 'txt', search=False)
txt = list(r)[0].to_text()
except (dns.resolver.NoAnswer, dns.resolver.NXDOMAIN):
txt = ''
m = f'OMG, {addr} is listed in DNSBL {bl}: {address} ({txt})'
return m
def check_rdns(addrs):
errs = 0
for (addr, domain) in addrs:
if domain is None:
continue
log.debug('Check if there is a reverse DNS record that maps address {} to {}'
.format(addr, domain))
try:
r = dns.resolver.resolve(dns.reversename.from_address(addr), 'ptr', search=False)
a = list(r)[0]
target = str(a.target).lower()
source = str(domain).lower()
log.debug('Reverse DNS record for {} points to {}'.format(addr, target))
if domain and source + '.' != target and source != target:
log.error('domain {} resolves to {}, but the reverse record resolves to {}'.
format(domain, addr, target))
errs = errs + 1
except (dns.resolver.NXDOMAIN, dns.resolver.NoAnswer):
log.error('There is no reverse DNS record for {}'.format(addr))
errs = errs + 1
return errs
return errs
def check_dbls(domain, dbls, retries):
d = domain
ls = [ (bl[0], 0, 0) for bl in dbls ]
errs = 0
while ls:
bl, i, ts = ls.pop(0)
if i > 0:
now = time.clock_gettime(time.CLOCK_REALTIME)
t = max(i * 23 - max(now - ts, 0), 0)
time.sleep(t)
try:
log.debug(f'Checking if domain {d} is listed in {bl} ...')
s = check_dbl(d, bl)
if s:
errs += 1
log.error(s)
except dns.exception.Timeout as e:
if i + 1 < retries:
log.warning(f'Resolving {d} in {bl} timed out - retrying later ...')
ls.append((bl, i+1, time.clock_gettime(time.CLOCK_REALTIME)))
else:
log.warning(f'Resolving {d} in {bl} timed out - giving up on it.')
return errs
def check_bls(addrs, bls, dest, retries):
ls = [ (x[0], x[1], y, 0, 0) for x in addrs for y in bls ]
errs = 0
while ls:
addr, domain, bl, i, ts = ls.pop(0)
if i > 0:
now = time.clock_gettime(time.CLOCK_REALTIME)
t = max(i * 23 - max(now - ts, 0), 0)
time.sleep(t)
try:
if ':' in addr and bl[0] in ipv6_incapable:
log.debug(f"Ignoring {bl[0]} because it doesn't support IPv6 ({addr})")
continue
log.debug(f'Checking if address {addr} (via {dest}) is listed in {bl[0]} ({bl[1]})')
s = check_dnsbl(addr, bl[0])
if s:
errs += 1
log.error(s)
except dns.exception.Timeout as e:
if i + 1 < retries:
log.warning(f'Resolving {addr} in {bl[0]} timed out - retrying later ...')
ls.append((addr, domain, bl, i+1, time.clock_gettime(time.CLOCK_REALTIME)))
else:
log.warning(f'Resolving {addr} in {bl[0]} timed out - giving up on it.')
return errs
def check_domain_lists(dbls):
errs = 0
for d in dbls:
bl = d[0]
log.debug(f'Checking {bl}')
s = check_dbl('test', bl)
if s is None:
log.error(f'OMG, mandatory "test" name is NOT listed in DBL {bl}')
errs += 1
s = check_dbl('invalid', bl)
if s:
log.error(s)
errs += 1
return errs
def check_addr_lists(bls):
errs = 0
for bl, blv, _ in bls:
try:
s = check_dnsbl('127.0.0.1', bl)
if s:
log.error(s)
errs += 1
s = check_dnsbl('127.0.0.2', bl)
if not s:
log.error(f'OMG, mandatory 127.0.0.2 is NOT listed in DNSBL {bl}')
errs += 1
except dns.exception.Timeout as e:
log.error(f'Resolving mandatory entries timed out on {bl}')
return errs
def run(args):
if args.check_lists:
return ( (check_addr_lists (args.bls ) if args.address else 0)
+ (check_domain_lists(args.dbls) if args.domain else 0) != 0 )
errs = 0
if args.address:
log.debug(f'Checking {len(args.bls)} DNS blacklists')
if args.domain:
log.debug(f'Checking {len(args.dbls)} domain based DNS blacklist')
for dest in args.dests:
addrs, domains = get_addrs(dest, mx=args.mx)
if args.address:
if args.rev:
errs = errs + check_rdns(addrs)
e = check_bls(addrs, args.bls, dest, args.retries)
if e:
log.error(f'{dest} is listed in {e} blacklists')
errs += e
if args.domain:
for d in domains:
e = check_dbls(d, args.dbls, args.retries)
if e:
log.error(f'{d} is listed {e} blacklists')
errs += e
return errs != 0
def main(*a):
args = parse_args(*a)
return run(args)
if __name__ == '__main__':
if 'IPython' in sys.modules:
# do something different when running inside a Jupyter notebook
pass
else:
try:
sys.exit(main())
except Exception as e:
log.error(e)
sys.exit(1)