-
Notifications
You must be signed in to change notification settings - Fork 59
/
Copy pathNEWS
1603 lines (1276 loc) · 56.5 KB
/
NEWS
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
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
Knot Resolver 6.0.11 (2025-0m-dd)
=================================
Bugfixes
--------
- manager: avoid an uncommon startup race in policy-loader (!1653)
[WARN] exited: policy-loader (exit status 0; not expected)
Knot Resolver 6.0.10 (2025-01-20)
=================================
Improvements
------------
- avoid multiple log lines when IPv6 isn't available (!1633)
- manager: fix startup on Linux without libsystemd (!1608)
- auto-reload TLS certificate files (!1626)
- Can be configured using the ``/network/tls/files-watchdog`` option. (!1645)
- reload TLS certificate files even if the configuration has not changed (!1644)
- kresctl: bash command-line TAB completion (!1622)
- add request prioritization (defer) to mitigate DoS attacks (!1641)
- views: allow overriding price-factor (!1646)
Knot Resolver 6.0.9 (2024-11-11)
================================
Improvements
------------
- rate-limiting: add these options, mechanism, docs (!1624)
- manager: secret for TLS session resumption via ticket (RFC5077) (!1567)
The manager creates and sets the secret for all running ``kresd`` workers.
The secret is created automatically if the user does not configure their own secret in the configuration.
This means that the workers will be able to resume each other's TLS sessions, regardless of whether the user has configured it to do so.
- answer NOTIMPL for meta-types and non-IN RR classes (!1589)
- views: improve interaction with old-style policies (!1576)
- stats: add stale answer counter 'answer.stale' (!1591)
- extended_errors: answer with EDE in more cases (!1585, !1588, !1590, !1592)
- local-data: make DNAMEs work, i.e. generate CNAMEs (!1609)
- daemon: use connected UDP sockets by default (#326, !1618)
- docker: multiplatform builds (#922, !1623)
- docker: shared VOLUMEs are prepared for configuration and cache (!1625, !1627)
Configuration path was changed to standard ``/etc/knot-resolver/config.yaml``.
Bugfixes
--------
- daemon/proxyv2: fix informing the engine about TCP/TLS from the actual client (!1578)
- forward: fix wrong pin-sha256 length; also log pins on mismatch (!1601, #813)
Incompatible changes
--------------------
- -f/--forks is removed (#631, !1602)
- gnutls < 3.4 support is dropped, released over 9 years ago (!1601)
- libuv < 1.27 support is dropped, released over 5 years ago (!1618)
Knot Resolver 6.0.8 (2024-07-23)
================================
Security
--------
- reduce buffering of transmitted data, especially TCP-based in userspace
Also expose some of the new tweaks in lua:
- (require 'ffi').C.the_worker.engine.net.tcp.user_timeout = 1000
- (require 'ffi').C.the_worker.engine.net.listen_{tcp,udp}_buflens.{snd,rcv}
Packaging
---------
- all packages:
- remove unused dependency on `libedit` (!1553)
- deb packages:
- packages ``knot-resolver-core`` and ``knot-resolver-manager`` have
been merged into a single ``knot-resolver6`` package. Suffix packages
``knot-resolver-*`` have been renamed to ``knot-resolver6-*``. This
change _should_ be transparent, but please do let us know if you
encounter any issues while updating. (!1549)
- package ``python3-prometheus-client`` is now only an optional dependency
- rpm packages:
- packages ``knot-resolver-core`` and ``knot-resolver-manager`` have
been merged into a single ``knot-resolver`` package. This change
_should_ be transparent, but please do let us know if you encounter
any issues while updating. (!1549)
- bugfix: do not overwrite config.yaml (!1525)
- package ``python3-prometheus_client`` is now only an optional dependency
- arch package:
- fix after they renamed a dependency (!1536)
Improvements
------------
- TLS (DoT, DoH): respect crypto policy overrides in OS (!1526)
- manager: export metrics to JSON via management HTTP API (!1527)
- JSON is the new default metrics output format
- the ``prometheus-client`` Python package is now an optional dependency, required only for Prometheus export to work
- cache: prefetching records
- predict module: prefetching expiring records moved to prefetch module
- prefetch module: new module to prefetch expiring records
- stats: add separate metrics for IPv6 and IPv4 (!1545)
- add the fresh DNSSEC root key "KSK-2024" already, Key ID 38696 (!1556)
- manager: policy-loader: new component for separate loading of policy rules (!1540)
The ``policy-loader`` ensures that configured policies are loaded into the rules database
where they are made available to all running kresd workers. This loading is no longer done
by all kresd workers as it was before, so this should significantly improve the resolver's
startup/reload time when loading large sets of policy rules, e.g. large RPZs.
Incompatible changes
--------------------
- cache: the ``cache.prediction`` configuration property has been reorganized
into ``cache.prefetch.expiring`` and ``cache.prefetch.prediction``, changing
the default behaviour as well. See the `relevant documentation section
<https://www.knot-resolver.cz/documentation/v6.0.8/config-cache-predict.html>`_
for more.
- libknot <=3.2.x support is dropped (!1565)
Bugfixes
--------
- arch package: fix after they renamed a dependency (!1536)
- fix startup with `dnssec: false` (!1548)
- rpm packages: do not overwrite config.yaml (!1525)
- fix NSEC3 records missing in answer for positive wildcard expansion
with the NSEC3 having over-limit iteration count (#910, !1550)
- views: fix a bug in subnet matching (!1562)
Knot Resolver 6.0.7 (2024-03-27)
================================
Improvements
------------
- manager: clear the cache via management HTTP API (#876, !1491)
- manager: added support for Python 3.12 and removed for 3.7 (!1502)
- manager: use build-time install prefix to execute `kresd` instead of PATH (!1511)
- docs: documentation is now separated into user and developer parts (!1514)
- daemon: ignore UDP requests from ports < 1024 (!1507)
- manager: increase startup timeout for processes (!1518, !1520)
- local-data: increase default DB size to 2G on 64-bit platforms (!1518)
Bugfixes
--------
- fix listening by interface name containing dashes (#900, !1500)
- fix kresctl http request timeout (!1505)
- fix RPZ if it contains apex NS record (!1516)
- fix RPZ if SOA is repated, as usual in AXFR output (!1521)
- avoid RPZ overriding the root SOA (!1521)
- fix on 32-bit systems with 64-bit time_t (!1510)
- fix paths to knot-dns libs if exec_prefix != prefix (!1503)
- manager: add missing early check that neither a custom port nor TLS is set for
authoritative server forwarding (#902, !1505)
Knot Resolver 6.0.6 (2024-02-13)
================================
Security
--------
- CVE-2023-50868: NSEC3 closest encloser proof can exhaust CPU
* validator: lower the NSEC3 iteration limit (150 -> 50)
* validator: similarly also limit excessive NSEC3 salt length
* cache: limit the amount of work on SHA1 in NSEC3 aggressive cache
* validator: limit the amount of work on SHA1 in NSEC3 proofs
* validator: refuse to validate answers with more than 8 NSEC3 records
- CVE-2023-50387 "KeyTrap": DNSSEC verification complexity
could be exploited to exhaust CPU resources and stall DNS resolvers.
Solution boils down mainly to limiting crypto-validations per packet.
We would like to thank Elias Heftrig, Haya Schulmann, Niklas Vogel and Michael Waidner
from the German National Research Center for Applied Cybersecurity ATHENE
for bringing this vulnerability to our attention.
Improvements
------------
- update addresses of B.root-servers.net (!1478)
- tweak the default run_dir on non-Linux (!1481)
Bugfixes
--------
- fix potential SERVFAIL deadlocks if net.ipv6 = false (#880)
- fix validation of RRsets around 64 KiB size; needs libknot >= 3.4 (!1497)
Knot Resolver 6.0.5 (2024-01-09)
================================
6.0.x are "early access" versions,
not generally recommended for production use.
6.0 contains biggest changes in the history of Knot Resolver releases.
You will have to rewrite your configuration. See documentation, in particular:
https://www.knot-resolver.cz/documentation/latest/upgrading-to-6.html
5.x branch longterm support
~~~~~~~~~~~~~~~~~~~~~~~~~~~
Knot Resolver 5.7.4 (2024-07-23)
================================
Security
--------
- reduce buffering of transmitted data, especially TCP-based in userspace
Also expose some of the new tweaks in lua:
(require 'ffi').C.the_worker.engine.net.tcp.user_timeout = 1000
(require 'ffi').C.the_worker.engine.net.listen_{tcp,udp}_buflens.{snd,rcv}
Improvements
------------
- add the fresh DNSSEC root key "KSK-2024" already, Key ID 38696 (!1556)
Incompatible changes
--------------------
- libknot 3.0.x support is dropped (!1558)
Upstream last maintained 3.0.x in spring 2022.
Knot Resolver 5.7.3 (2024-05-30)
================================
Improvements
------------
- stats: add separate metrics for IPv6 and IPv4 (!1544)
Bugfixes
--------
- fix NSEC3 records missing in answer for positive wildcard expansion
with the NSEC3 having over-limit iteration count (#910, !1550)
Knot Resolver 5.7.2 (2024-03-27)
================================
Bugfixes
--------
- fix on 32-bit systems with 64-bit time_t (!1510)
Knot Resolver 5.7.1 (2024-02-13)
================================
Security
--------
- CVE-2023-50868: NSEC3 closest encloser proof can exhaust CPU
* validator: lower the NSEC3 iteration limit (150 -> 50)
* validator: similarly also limit excessive NSEC3 salt length
* cache: limit the amount of work on SHA1 in NSEC3 aggressive cache
* validator: limit the amount of work on SHA1 in NSEC3 proofs
* validator: refuse to validate answers with more than 8 NSEC3 records
- CVE-2023-50387 "KeyTrap": DNSSEC verification complexity
could be exploited to exhaust CPU resources and stall DNS resolvers.
Solution boils down mainly to limiting crypto-validations per packet.
We would like to thank Elias Heftrig, Haya Schulmann, Niklas Vogel and Michael Waidner
from the German National Research Center for Applied Cybersecurity ATHENE
for bringing this vulnerability to our attention.
Improvements
------------
- update addresses of B.root-servers.net (!1478)
Bugfixes
--------
- fix potential SERVFAIL deadlocks if net.ipv6 = false (#880)
Knot Resolver 5.7.0 (2023-08-22)
================================
Security
--------
- avoid excessive TCP reconnections in a few more cases (!1448)
Like before, the remote server had to behave nonsensically in order
to inflict this upon itself, but it might be abusable for DoS.
We thank Ivan Jedek from OryxLabs for reporting this.
CVE-2023-46317 got later assigned to this issue.
Improvements
------------
- forwarding mode: tweak dealing with failures from forwarders,
in particular prefer sending CD=0 upstream (!1392)
Bugfixes
--------
- fix unusual timestamp format in debug dumps of records (!1386)
- adjust linker options; it should help less common platforms (!1384)
- hints module: fix names inside home.arpa. (!1406)
- EDNS padding (RFC 8467) compatibility with knot-dns 3.3 libs (!1422)
Knot Resolver 5.6.0 (2023-01-26)
================================
Security
--------
- avoid excessive TCP reconnections in some cases (!1380)
For example, a DNS server that just closes connections without answer
could cause lots of work for the resolver (and itself, too).
The number of connections could be up to around 100 per client's query.
We thank Xiang Li from NISL Lab, Tsinghua University,
and Xuesong Bai and Qifan Zhang from DSP Lab, UCI.
Improvements
------------
- daemon: feed server selection with more kinds of bad-answer events (!1380)
- cache.max_ttl(): lower the default from six days to one day
and apply both limits to the first uncached answer already (!1323 #127)
- depend on jemalloc, preferably, to improve memory usage (!1353)
- no longer accept DNS messages with trailing data (!1365)
- policy.STUB: avoid applying aggressive DNSSEC denial proofs (!1364)
- policy.STUB: avoid copying +dnssec flag from client to upstream (!1364)
Bugfixes
--------
- policy.DEBUG_IF: don't print client's packet unconditionally (!1366)
Knot Resolver 5.5.3 (2022-09-21)
================================
Security
--------
- fix CPU-expensive DoS by malicious domains - CVE-2022-40188
Improvements
------------
- fix config_tests on macOS (both HW variants)
Knot Resolver 5.5.2 (2022-08-16)
================================
Improvements
------------
- support libknot 3.2 (!1309)
- priming module: hide failures from the default log level (!1310)
- reduce memory usage in some cases (!1328)
Bugfixes
--------
- daemon/http: improve URI checks to fix some proxies (#746, !1311)
- daemon/tls: fix a double-free for some cases of policy.TLS_FORWARD (!1314)
- hints module: improve parsing comments in hosts files (!1315)
- renumber module: fix renumbering with name matching again (#760, !1334)
Knot Resolver 5.5.1 (2022-06-14)
================================
Improvements
------------
- daemon/tls: disable TLS resumption via tickets for TLS <= 1.2 (#742, !1295)
- daemon/http: DoH now responds with proper HTTP codes (#728, !1279)
- renumber module: allow rewriting subnet to a single IP (!1302)
- renumber module: allow arbitrary netmask (!1306)
- nameserver selection algorithm: improve IPv6 avoidance if broken (!1298)
Bugfixes
--------
- modules/dns64: fix incorrect packet writes for cached packets (#727, !1275)
- xdp: make it work also with libknot 3.1 (#735, !1276)
- prefill module: fix lockup when starting multiple idle instances (!1285)
- validator: fix some failing negative NSEC proofs (!1294, #738, #443)
Knot Resolver 5.5.0 (2022-03-15)
================================
Improvements
------------
- extended_errors: module for extended DNS error support, RFC8914 (!1234)
- policy: log policy actions; useful for RPZ debugging (!1239)
- policy: new action policy.IPTRACE for logging request origin (!1239)
- prefill module: prepare for ZONEMD, improve performance (!1225)
- validator: conditionally ignore SHA1 DS, as SHOULD by RFC4509 (!1251)
- lib/resolve: use EDNS padding for outgoing TLS queries (!1254)
- support for PROXYv2 protocol (!1238)
- lib/resolve, policy: new NO_ANSWER flag for not responding to clients (!1257)
Incompatible changes
--------------------
- libknot >= 3.0.2 is required
Bugfixes
--------
- doh2: fix CORS by adding `access-control-allow-origin: *` (!1246)
- net: fix listen by interface - add interface suffix to link-local IPv6 (!1253)
- daemon/tls: fix resumption for outgoing TLS (e.g. TLS_FORWARD) (!1261)
- nameserver selection: fix interaction of timeouts with reboots (#722, !1269)
Knot Resolver 5.4.4 (2022-01-05)
================================
Bugfixes
--------
- fix bad zone cut update in certain cases (e.g. AWS; !1237)
Knot Resolver 5.4.3 (2021-12-01)
================================
Improvements
------------
- lua: add kres.parse_rdata() to parse RDATA from string to wire format (!1233)
- lua: add policy.domains() for exact domain name matching (!1228)
Bugfixes
--------
- policy.rpz: fix origin detection in files without $ORIGIN (!1215)
- lua: log() works again; broken in 5.4.2 (!1223)
- policy: correctly include EDNS0 previously omitted by some actions (!1230)
- edns_keepalive: module is now properly loaded (!1229, thanks Josh Soref!)
Knot Resolver 5.4.2 (2021-10-13)
================================
Improvements
------------
- dns64 module: also map the reverse (PTR) subtree (#478, !1201)
- dns64 module: allow disabling based on client address (#368, !1201)
- dns64 module: allow configuring AAAA subnets not allowed in answer (!1201)
- nameserver selection algorithm: improve IPv6 avoidance if broken (!1207)
Bugfixes
--------
- lua: log() output is visible with default log level again (!1208)
- build: fix when knot-dns headers are on non-standard location (!1210)
Knot Resolver 5.4.1 (2021-08-19)
================================
Improvements
------------
- docker: base image on Debian 11 (!1203)
Bugfixes
--------
- fix build without doh2 support after 5.4.0 (!1197)
- fix policy.DEBUG* logging and -V/--version after 5.4.0 (!1199)
- doh2: ensure memory from unsent streams is freed (!1202)
Knot Resolver 5.4.0 (2021-07-29)
================================
Improvements
------------
- fine grained logging and syslog support (!1181)
- expose HTTP headers for processing DoH requests (!1165)
- improve assertion mechanism for debugging (!1146)
- support apkg tool for packaging workflow (!1178)
- support Knot DNS 3.1 (!1192, !1194)
Bugfixes
--------
- trust_anchors.set_insecure: improve precision (#673, !1177)
- plug memory leaks related to TCP (!1182)
- policy.FLAGS: fix not applying properly in edge cases (!1179)
- fix a crash with older libuv inside timer processing (!1195)
Incompatible changes
--------------------
- see upgrading guide:
https://knot-resolver.readthedocs.io/en/stable/upgrading.html#to-5-4
- legacy DoH implementation configuration in net.listen() was renamed from
kind="doh" to kind="doh_legacy" (!1180)
Knot Resolver 5.3.2 (2021-05-05)
================================
Security
--------
- validator: fix 5.3.1 regression on over-limit NSEC3 edge case (!1169)
Assertion might be triggered by query/answer, potentially DoS.
CVE-2021-40083 was later assigned.
Improvements
------------
- cache: improve handling write errors from LMDB (!1159)
- doh2: improve handling of stream errors (!1164)
Bugfixes
--------
- dnstap module: fix repeated configuration (!1168)
- validator: fix SERVFAIL for some rare dynamic proofs (!1166)
- fix SIGBUS on uncommon ARM machines (unaligned access; !1167, #426)
- cache: better resilience on abnormal termination/restarts (!1172)
- doh2: fix memleak on stream write failures (!1161)
Knot Resolver 5.3.1 (2021-03-31)
================================
Improvements
------------
- policy.STUB: try to avoid TCP (compared to 5.3.0; !1155)
- validator: downgrade NSEC3 records with too many iterations (>150; !1160)
- additional improvements to nameserver selection algorithm (!1154, !1150)
Bugfixes
--------
- dnstap module: don't break request resolution on dnstap errors (!1147)
- cache garbage collector: fix crashes introduced in 5.3.0 (!1153)
- policy.TLS_FORWARD: better avoid dead addresses (#671, !1156)
Knot Resolver 5.3.0 (2021-02-25)
================================
Improvements
------------
- more consistency in using parent-side records for NS addresses (!1097)
- better algorithm for choosing nameservers (!1030, !1126, !1140, !1141, !1143)
- daf module: add daf.clear() (!1114)
- dnstap module: more features and don't log internal requests (!1103)
- dnstap module: include in upstream packages and Docker image (!1110, !1118)
- randomize record order by default, i.e. reorder_RR(true) (!1124)
- prometheus module: transform graphite tags into prometheus labels (!1109)
- avoid excessive logging of UDP replies with sendmmsg (!1138)
Bugfixes
--------
- view: fail config if bad subnet is specified (!1112)
- doh2: fix memory leak (!1117)
- policy.ANSWER: minor fixes, mainly around NODATA answers (!1129)
- http, watchdog modules: fix stability problems (!1136)
Incompatible changes
--------------------
- dnstap module: `log_responses` option gets nested under `client`;
see new docs for config example (!1103)
- libknot >= 2.9 is required
Knot Resolver 5.2.1 (2020-12-09)
================================
Improvements
------------
- doh2: send Cache-Control header with TTL (#617, !1095)
Bugfixes
--------
- fix map() command on 32-bit platforms; regressed in 5.2.0 (!1093)
- doh2: restrict endpoints to doh and dns-query (#636, !1104)
- renumber: map to correct subnet when using multiple rules (!1107)
Knot Resolver 5.2.0 (2020-11-11)
================================
Improvements
------------
- doh2: add native C module for DNS-over-HTTPS (#600, !997)
- xdp: add server-side XDP support for higher UDP performance (#533, !1083)
- lower default EDNS buffer size to 1232 bytes (#538, #300, !920);
see https://www.dnsflagday.net/2020/
- net: split the EDNS buffer size into upstream and downstream (!1026)
- lua-http doh: answer to /dns-query endpoint as well as /doh (!1069)
- improve resiliency against UDP fragmentation attacks (disable PMTUD) (!1061)
- ta_update: warn if there are differences between statically configured
keys and upstream (#251, !1051)
- human readable output in interactive mode was improved
- doc: generate info page (!1079)
- packaging: improve sysusers and tmpfiles support (!1080)
Bugfixes
--------
- avoid an assert() error in stash_rrset() (!1072)
- fix emergency cache locking bug introduced in 5.1.3 (!1078)
- migrate map() command to control sockets; fix systemd integration (!1000)
- fix crash when sending back errors over control socket (!1000)
- fix SERVFAIL while processing forwarded CNAME to a sibling zone (#614, !1070)
Incompatible changes
--------------------
- see upgrading guide:
https://knot-resolver.readthedocs.io/en/stable/upgrading.html#to-5-2
- minor changes in module API
- control socket API commands have to be terminated by "\n"
- graphite: default prefix now contains instance identifier (!1000)
- build: meson >= 0.49 is required (!1082)
Knot Resolver 5.1.3 (2020-09-08)
================================
Improvements
------------
- capabilities are no longer constrained when running as root (!1012)
- cache: add percentage usage to cache.stats() (#580, !1025)
- cache: add number of cache entries to cache.stats() (#510, !1028)
- aarch64 support again, as some systems still didn't work (!1033)
- support building against Knot DNS 3.0 (!1053)
Bugfixes
--------
- tls: fix compilation to support net.tls_sticket_secret() (!1021)
- validator: ignore bogus RRSIGs present in insecure domains (!1022, #587)
- build if libsystemd version isn't detected as integer (#592, !1029)
- validator: more robust reaction on missing RRSIGs (#390, !1020)
- ta_update module: fix broken RFC5011 rollover (!1035)
- garbage collector: avoid keeping multiple copies of cache (!1042)
Knot Resolver 5.1.2 (2020-07-01)
================================
Bugfixes
--------
- hints module: NODATA answers also for non-address queries (!1005)
- tls: send alert to peer if handshake fails (!1007)
- cache: fix interaction between LMDB locks and preallocation (!1013)
- cache garbage collector: fix flushing of messages to logs (!1009)
- cache garbage collector: fix insufficient GC on 32-bit systems (!1009)
- graphite module: do not block resolver on TCP failures (!1014)
- policy.rpz various fixes (!1016): $ORIGIN issues,
precision of warnings, allow answering with multi-RR sets
Knot Resolver 5.1.1 (2020-05-19)
================================
Security
--------
- fix CVE-2020-12667: mitigation for NXNSAttack DNS protocol vulnerability
Bugfixes
--------
- control sockets: recognize newline as command boundary
Knot Resolver 5.1.0 (2020-04-29)
================================
Improvements
------------
- cache garbage collector: reduce filesystem operations when idle (!946)
- policy.DEBUG_ALWAYS and policy.DEBUG_IF for limited verbose logging (!957)
- daemon: improve TCP query latency under heavy TCP load (!968)
- add policy.ANSWER action (!964, #192)
- policy.rpz support fake A/AAAA (!964, #194)
Bugfixes
--------
- cache: missing filesystem support for pre-allocation is no longer fatal (#549)
- lua: policy.rpz() no longer watches the file when watch is set to false (!954)
- fix a strict aliasing problem that might've lead to "miscompilation" (!962)
- fix handling of DNAMEs, especially signed ones (#234, !965)
- lua resolve(): correctly include EDNS0 in the virtual packet (!963)
Custom modules might have been confused by that.
- do not leak bogus data into SERVFAIL answers (#396)
- improve random Lua number generator initialization (!979)
- cache: fix CNAME caching when validation is disabled (#472, !974)
- cache: fix CNAME caching in policy.STUB mode (!974)
- prefill: fix crash caused by race condition with resolver startup (!983)
- webmgmt: use javascript scheme detection for websockets' protocol (#546)
- daf module: fix del(), deny(), drop(), tc(), pass() functions (#553, !966)
- policy and daf modules: expose initial query when evaluating postrules (#556)
- cache: fix some cases of caching answers over 4 KiB (!976)
- docs: support sphinx 3.0.0+ (!978)
Incompatible changes
--------------------
- minor changes in module API; see upgrading guide:
https://knot-resolver.readthedocs.io/en/stable/upgrading.html
Knot Resolver 5.0.1 (2020-02-05)
================================
Bugfixes
--------
- systemd: use correct cache location for garbage collector (#543)
Improvements
------------
- cache: add cache.fssize() lua function to configure entire free disk space on
dedicated cache partition (#524, !932)
Knot Resolver 5.0.0 (2020-01-27)
================================
Incompatible changes
--------------------
- see upgrading guide: https://knot-resolver.readthedocs.io/en/stable/upgrading.html
- systemd sockets are no longer supported (#485)
- net.listen() throws an error if it fails to bind; use freebind option if needed
- control socket location has changed (!922)
- -f/--forks is deprecated (#529, !919)
Improvements
------------
- logging: control-socket commands don't log unless --verbose (#528)
- use SO_REUSEPORT_LB if available (FreeBSD 12.0+)
- lua: remove dependency on lua-socket and lua-sec, used lua-http and cqueues (#512, #521, !894)
- lua: remove dependency on lua-filesystem (#520, !912)
- net.listen(): allow binding to non-local address with freebind option (!898)
- cache: pre-allocate the file to avoid SIGBUS later (not macOS; !917, #525)
- lua: be stricter around nonsense returned from modules (!901)
- user documentation was reorganized and extended (!900, !867)
- multiple config files can be used with --config/-c option (!909)
- lua: stop trying to tweak lua's GC (!201)
- systemd: add SYSTEMD_INSTANCE env variable to identify different instances (!906)
Bugfixes
--------
- correctly use EDNS(0) padding in failed answers (!921)
- policy and daf modules: fix postrules and reroute rules (!901)
- renumber module: don't accidentally zero-out request's .state (!901)
Knot Resolver 4.3.0 (2019-12-04)
================================
Security - CVE-2019-19331
-------------------------
- fix speed of processing large RRsets (DoS, #518)
- improve CNAME chain length accounting (DoS, !899)
Bugfixes
--------
- http module: use SO_REUSEPORT (!879)
- systemd: kresd@.service now properly starts after network interfaces
have been configured with IP addresses after reboot (!884)
- sendmmsg: improve reliability (!704)
- cache: fix crash on insertion via lua for NS and CNAME (!889)
- rpm package: move root.keys to /var/lib/knot-resolver (#513, !888)
Improvements
------------
- increase file-descriptor count limit to maximum allowed value (hard limit; !876)
- watchdog module: support testing a DNS query (and switch C -> lua; !878, !881)
- performance: use sendmmsg syscall towards clients by default (!877)
- performance: avoid excessive getsockname() syscalls (!854)
- performance: lua-related improvements (!874)
- daemon now attempts to drop all capabilities (!896)
- reduce CNAME chain length limit - now <= 12 (!899)
Knot Resolver 4.2.2 (2019-10-07)
================================
Bugfixes
--------
- lua bindings: fix a 4.2.1 regression on 32-bit systems (#514)
which also fixes libknot 2.9 support on all systems
Knot Resolver 4.2.1 (2019-09-26)
================================
Bugfixes
--------
- rebinding module: fix handling some requests, respect ALLOW_LOCAL flag
- fix incorrect SERVFAIL on cached bogus answer for +cd request (!860)
(regression since 4.1.0 release, in less common cases)
- prefill module: allow a different module-loading style (#506)
- validation: trim TTLs by RRSIG's expiration and original TTL (#319, #504)
- NS choice algorithm: fix a regression since 4.0.0 (#497, !868)
- policy: special domains home.arpa. and local. get NXDOMAIN (!855)
Improvements
------------
- add compatibility with (future) libknot 2.9
Knot Resolver 4.2.0 (2019-08-05)
================================
Improvements
------------
- queries without RD bit set are REFUSED by default (!838)
- support forwarding to multiple targets (!825)
Bugfixes
--------
- tls_client: fix issue with TLS session resumption (#489)
- rebinding module: fix another false-positive assertion case (!851)
Module API changes
------------------
- kr_request::add_selected is now really put into answer,
instead of the "duplicate" ::additional field (#490)
Knot Resolver 4.1.0 (2019-07-10)
================================
Security
--------
- fix CVE-2019-10190: do not pass bogus negative answer to client (!827)
- fix CVE-2019-10191: do not cache negative answer with forged QNAME+QTYPE (!839)
Improvements
------------
- new cache garbage collector is available and enabled by default (#257)
This improves cache efficiency on big installations.
- DNS-over-HTTPS: unknown HTTP parameters are ignored to improve compatibility
with non-standard clients (!832)
- DNS-over-HTTPS: answers include `access-control-allow-origin: *` (!823)
which allows JavaScript to use DoH endpoint.
- http module: support named AF_UNIX stream sockets (again)
- aggressive caching is disabled on minimal NSEC* ranges (!826)
This improves cache effectivity with DNSSEC black lies and also accidentally
works around bug in proofs-of-nonexistence from F5 BIG-IP load-balancers.
- aarch64 support, even kernels with ARM64_VA_BITS >= 48 (#216, !797)
This is done by working around a LuaJIT incompatibility. Please report bugs.
- lua tables for C modules are more strict by default, e.g. `nsid.foo`
will throw an error instead of returning `nil` (!797)
- systemd: basic watchdog is now available and enabled by default (#275)
Bugfixes
--------
- TCP to upstream: fix unlikely case of sending out wrong message length (!816)
- http module: fix problems around maintenance of ephemeral certs (!819)
- http module: also send intermediate TLS certificate to clients,
if available and luaossl >= 20181207 (!819)
- send EDNS with SERVFAILs, e.g. on validation failures (#180, !827)
- prefill module: avoid crash on empty zone file (#474, !840)
- rebinding module: avoid excessive iteration on blocked attempts (!842)
- rebinding module: fix crash caused by race condition (!842)
- rebinding module: log each blocked query only in verbose mode (!842)
- cache: automatically clear stale reader locks (!844)
Module API changes
------------------
- lua modules may omit casting parameters of layer functions (!797)
Knot Resolver 4.0.0 (2019-04-18)
================================
Incompatible changes
--------------------
- see upgrading guide: https://knot-resolver.readthedocs.io/en/stable/upgrading.html
- configuration: trust_anchors aliases .file, .config() and .negative were removed (!788)
- configuration: trust_anchors.keyfile_default is no longer accessible (!788)
- daemon: -k/--keyfile and -K/--keyfile-ro options were removed
- meson build system is now used for builds (!771)
- build with embedded LMBD is no longer supported
- default modules dir location has changed
- DNSSEC is enabled by default
- upstream packages for Debian now require systemd
- libknot >= 2.8 is required
- net.list() output format changed (#448)
- net.listen() reports error when address-port pair is in use
- bind to DNS-over-TLS port by default (!792)
- stop versioning libkres library
- default port for web management and APIs changed to 8453
Improvements
------------
- policy.TLS_FORWARD: if hostname is configured, send it on wire (!762)
- hints module: allow configuring the TTL and change default from 0 to 5s
- policy module: policy.rpz() will watch the file for changes by default
- packaging: lua cqueues added to default dependencies where available
- systemd: service is no longer auto-restarted on configuration errors
- always send DO+CD flags upstream, even in insecure zones (#153)
- cache.stats() output is completely new; see docs (!775)
- improve usability of table_print() (!790, !801)
- add DNS-over-HTTPS support (#280)
- docker image supports and exposes DNS-over-HTTPS
Bugfixes
--------
- predict module: load stats module if config didn't specify period (!755)
- trust_anchors: don't do 5011-style updates on anchors from files
that were loaded as unmanaged trust anchors (!753)
- trust_anchors.add(): include these TAs in .summary() (!753)
- policy module: support '#' for separating port numbers, for consistency
- fix startup on macOS+BSD when </dev/null and cqueues installed
- policy.RPZ: log problems from zone-file level of parser as well (#453)
- fix flushing of messages to logs in some cases (notably systemd) (!781)
- fix fallback when SERVFAIL or REFUSED is received from upstream (!784)
- fix crash when dealing with unknown TA key algorithm (#449)
- go insecure due to algorithm support even if DNSKEY is NODATA (!798)
- fix mac addresses in the output of net.interfaces() command (!804)
- http module: fix too early renewal of ephemeral certificates (!808)
Module API changes
------------------
- kr_straddr_split() changed API a bit (compiler will catch that)
- C modules defining `*_layer` or `*_props` symbols need to change a bit
See the upgrading guide for details. It's detected on module load.
Knot Resolver 3.2.1 (2019-01-10)
================================
Bugfixes
--------
- trust_anchors: respect validity time range during TA bootstrap (!748)
- fix TLS rehandshake handling (!739)
- make TLS_FORWARD compatible with GnuTLS 3.3 (!741)
- special thanks to Grigorii Demidov for his long-term work on Knot Resolver!
Improvements
------------
- improve handling of timed out outgoing TCP connections (!734)
- trust_anchors: check syntax of public keys in DNSKEY RRs (!748)
- validator: clarify message about bogus non-authoritative data (!735)
- dnssec validation failures contain more verbose reasoning (!735)
- new function trust_anchors.summary() describes state of DNSSEC TAs (!737),
and logs new state of trust anchors after start up and automatic changes
- trust anchors: refuse revoked DNSKEY even if specified explicitly,
and downgrade missing the SEP bit to a warning
Knot Resolver 3.2.0 (2018-12-17)
================================
New features
------------
- module edns_keepalive to implement server side of RFC 7828 (#408)
- module nsid to implement server side of RFC 5001 (#289)
- module bogus_log provides .frequent() table (!629, credit Ulrich Wisser)
- module stats collects flags from answer messages (!629, credit Ulrich Wisser)
- module view supports multiple rules with identical address/TSIG specification
and keeps trying rules until a "non-chain" action is executed (!678)
- module experimental_dot_auth implements an DNS-over-TLS to auth protocol
(!711, credit Manu Bretelle)
- net.bpf bindings allow advanced users to use eBPF socket filters
Bugfixes
--------
- http module: only run prometheus in parent process if using --forks=N,
as the submodule collects metrics from all sub-processes as well.
- TLS fixes for corner cases (!700, !714, !716, !721, !728)
- fix build with -DNOVERBOSELOG (#424)
- policy.{FORWARD,TLS_FORWARD,STUB}: respect net.ipv{4,6} setting (!710)
- avoid SERVFAILs due to certain kind of NS dependency cycles, again
(#374) this time seen as 'circular dependency' in verbose logs
- policy and view modules do not overwrite result finished requests (!678)
Improvements
------------
- Dockerfile: rework, basing on Debian instead of Alpine
- policy.{FORWARD,TLS_FORWARD,STUB}: give advantage to IPv6
when choosing whom to ask, just as for iteration
- use pseudo-randomness from gnutls instead of internal ISAAC (#233)
- tune the way we deal with non-responsive servers (!716, !723)
- documentation clarifies interaction between policy and view modules (!678, !730)
Module API changes
------------------
- new layer is added: answer_finalize
- kr_request keeps ::qsource.packet beyond the begin layer
- kr_request::qsource.tcp renamed to ::qsource.flags.tcp
- kr_request::has_tls renamed to ::qsource.flags.tls
- kr_zonecut_add(), kr_zonecut_del() and kr_nsrep_sort() changed parameters slightly
Knot Resolver 3.1.0 (2018-11-02)
================================
Incompatible changes
--------------------
- hints.use_nodata(true) by default; that's what most users want
- libknot >= 2.7.2 is required
Improvements
------------
- cache: handle out-of-space SIGBUS slightly better (#197)
- daemon: improve TCP timeout handling (!686)
Bugfixes
--------
- cache.clear('name'): fix some edge cases in API (#401)
- fix error handling from TLS writes (!669)
- avoid SERVFAILs due to certain kind of NS dependency cycles (#374)
Knot Resolver 3.0.0 (2018-08-20)
================================
Incompatible changes
--------------------
- cache: fail lua operations if cache isn't open yet (!639)
By default cache is opened *after* reading the configuration,
and older versions were silently ignoring cache operations.
Valid configuration must open cache using `cache.open()` or `cache.size =`
before executing cache operations like `cache.clear()`.
- libknot >= 2.7.1 is required, which brings also larger API changes
- in case you wrote custom Lua modules, please consult