Unbound 1.22.0rc1 pre-release

[Wouter Wijngaards]

Hi,

Unbound 1.22.0rc1 pre-release is available:
https://nlnetlabs.nl/downloads/unbound/unbound-1.22.0rc1.tar.gz
sha256 3c121143c99a927b411668d096c506beda31f9f7f91dc9c45dca4691e0b3898b
pgp https://nlnetlabs.nl/downloads/unbound/unbound-1.22.0rc1.tar.gz.asc

This release has an option to harden against unverified glue, it
is enabled with `harden-unverified-glue: yes`. It was contributed
by Karthik Umashankar from Microsoft. This protects Unbound against
bad glue, that is out of zone, by performing a lookup for it.
Because it uses the original information as a last resort if nothing
works, it should not give lookup failures, and add protection.

There are options to configure the scrubbing for NS records and
the CNAME scrubbing and the max global quota lookup limit from
previous security fix releases. They can be configured with the
options `iter-scrub-ns`, `iter-scrub-cname` and `max-global-quota`.

For redis use, with cachedb, it is possible to specify the
timeout for the initial connection separately from the timeout
for commands. With the options `redis-command-timeout: 20` and
`redis-connect-timeout: 200` they can be set separately, for
a longer connect attempt, but a short command timeout to keep
resolution faster.

It is possible to log with ISO8601 format with `log-time-iso: yes`
this also logs time in milliseconds. Useful if the server writes to
file, syslog may have its own format.

DNS over QUIC is support is added, if compiled with libngtcp2 and
with the openssl+quic that it uses. Use `--with-libngtcp2` for that,
and enable it with `quic-port: 853`. There is a post about it
on https://blog.nlnetlabs.nl/dns-over-quic-in-unbound [that is to
appear after the release].

Features
- Add iter-scrub-ns, iter-scrub-cname and max-global-quota
   configuration options.
- Merge patch to fix for glue that is outside of zone, with
   `harden-unverified-glue`, from Karthik Umashankar (Microsoft).
   Enabling this option protects the Unbound resolver against bad
   glue, that is unverified out of zone glue, by resolving them.
   It uses the records as last resort if there is no other working
   glue.
- Add redis-command-timeout: 20 and redis-connect-timeout: 200,
   that can set the timeout separately for commands and the
   connection set up to the redis server. If they are not
   specified, the redis-timeout value is used.
- Fix #1144: [FR] log timestamps in ISO8601 format with timezone.
   This adds the option `log-time-iso: yes` that logs in ISO8601
   format.
- Merge #871: DNS over QUIC. This adds `quic-port: 853` and
   `quic-size: 8m` that enable dnsoverquic, and the counters
   `num.query.quic` and `mem.quic` in the statistics output.
   The feature needs to be enabled by compiling with libngtcp2,
   with `--with-libngtcp2=path` and libngtcp2 needs openssl+quic,
   pass that with `--with-ssl=path` to compile unbound as well.

Bug Fixes
- Fix #1126: unbound-control-setup hangs while testing for openssl
   presence starting from version 1.21.0.
- Add cross platform freebsd, openbsd and netbsd to github ci.
- Fix for char signedness warnings on NetBSD.
- Fix #1127: error: "memory exhausted" when defining more than 9994
   local-zones.
- Fix documentation for cache_fill_missing function.
- Fix #1130: Loads of logs: "validation failure: key for validation
   <domain>. is marked as invalid because of a previous" for
   non-DNSSEC signed zone.
- Fix that when rpz is applied the message does not get picked up by
   the validator. That stops validation failures for the message.
- Fix that stub-zone and forward-zone clauses do not exhaust memory
   for long content.
- Unit test for auth zone transfer TLS, and TLS failure.
- Fix to print port number in logs for auth zone transfer activities.
- Merge #1132: b.root renumbering.
- Fix for #1132, adjusted unit test for change in the test file.
- Fix for #1132, comment about adjusted copy of reference check.
- Merge #1135: Add new IANA trust anchor.
- Fix config file read for dnstap-sample-rate.
- Fix alloc-size and calloc-transposed-args compiler warnings.
- Fix comment to not trigger doxygen unknown command.
- Fix to limit NSEC and NSEC3 TTL when aggressive nsec is
   enabled (RFC9077).
- Add unit test for ttl limit for aggressive nsec.
- Fix and add comments in testdata/val_negcache_ttl.rpl.
- Merge #1140: Fix spelling mistake in comments.
- Fix doxygen warnings by commenting out CLANG_ASSISTED_PARSING,
   CLANG_ADD_INC_PATHS, CLANG_OPTIONS and CLANG_DATABASE_PATH; they were
   already disabled.
- Fix dns64 with prefetch that the prefetch is stored in cache.
- Attempt to further fix doh_downstream_buffer_size.tdir flakiness.
- More clear text for prefetch and minimal-responses in the
   unbound.conf man page.
- Merge #1143: Fix cache update when serve expired is used. Expired
   records are favored over resolution and validation failures when
   serve-expired is used.
- Fix negative cache NSEC3 parameter compares for zero length NSEC3
   salt.
- Fix unbound dnstap socket test program analyzer warnings about
   unused variable assignments and variable initialization.
- Fix #1149: unbound-control-setup hangs sometimes depending on
   the openssl version.
- Fix #1128: Cannot override tcp-upstream and tls-upstream with
   forward-tcp-upstream and forward-tls-upstream.
- Fix to limit NSEC TTL for messages from cachedb. Fix to limit the
   prefetch ttl for messages after a CNAME with short TTL.
- Fix for dnstap compile of doqclient with doq disabled.
- Fix cookie_file test sporadic fails for time change during
   the test.
- Fix add reallocarray to alloc stats unit test, and disable
   override of strdup in unbound-host, and the result of config
   get option is freed properly.

Best regards, Wouter