NLnetLabs/unbound release-1.22.0

Unbound 1.22.0

on GitHub

Unbound 1.22.0

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
  . 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.
• Fix to disable detection of quic configured ports when quic is
  not compiled in.
• Fix harden-unverified-glue for AAAA cache_fill_missing lookups.
• Fix contrib/aaaa-filter-iterator.patch for change in call
  signature for cache_fill_missing.
• Fix to display warning if quic-port is set but dnsoverquic is not
  enabled when compiled.
• Fix dnsoverquic to extend the number of streams when one is closed.
• Fix for dnstap with dnscrypt and dnstap without dnsoverquic.
• Fix for dnsoverquic and dnstap to use the correct dnstap
  environment.