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NEWS
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Knot Resolver 6.0.12 (2025-0m-dd)
=================================
Bugfixes
--------
- /management/unix-socket: revert to absolute path (#926, !1664)
Knot Resolver 6.0.11 (2025-02-26)
=================================
Bugfixes
--------
- manager: avoid an uncommon startup race in policy-loader (!1653)
[WARN] exited: policy-loader (exit status 0; not expected)
- manager: fix processes watchdog errors during shutdown (!1651)
- /cache/prefill/*/ca_file: fix setting this attribute (!1655)
Improvements
------------
- manager: allow multiple instances with different rundirs (!1656)
- tests: disable problematic config.http test (#925, !1662)
- /management/unix-socket: allow path relative to rundir (!1657)
- validator: accept a confusing NODATA proof with insecure delegation (!1659)
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: [email protected] 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
--------