Tags give the ability to mark specific points in history as being important
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release-1.18.0
3795e374 · ·Unbound 1.18.0 This release adds DNS cookies downstream, support to respond with EDE error codes from cache, NAT64 support, and the capability to use a socket queue timeout to discard old packets, and other features and bug fixes. The downstream DNS server cookies are from RFC7873 and RFC9018, it is turned on with `answer-cookie: yes`. It generates a random cookie secret, but for anycast setups the cookie secret can be configured with `cookie-secret: "128bithex"` with the same value as the other instances. Non cookie traffic can be disallowed with the `allow_cookie` acl option for access-control. Queries with valid cookie bypass the ordinary ratelimit, but a ratelimit can be configured for cookie queries with `ip-ratelimit-cookie: 100`. The statistics has counters for `query_cookie_valid` and `query_cookie_client` and `query_cookie_invalid`. When queries come in with CD flag, a DNSSEC validation EDE can be returned, with information regarding a failure. EDE error information is also stored in the cache with the query responses. There is also EDE error information stored for the cachedb and the subnetcache. There is NAT64 support, that is enabled with `do-nat64: yes`. The NAT64 prefix can be configured too, if not the default `nat64-prefix: 64:ff9b::0/96`. This is useful for an IPv6 only host where Unbound is running, so that Unbound can use NAT64 to connect to IPv4 servers. The new default for the maximum UDP response size is 1232, with `max-udp-size: 1232`. This is similar to other resolvers. The new default is smaller and that makes it harder to get large responses. Thanks to Xiang Li, from NISL Lab, Tsinghua University. There is a new option `harden-unknown-additional: yes`. This removes unknown records from the authority and additional section. This stops unknown records from being copied from the upstream to the downstream client, potentially exposing those clients to the extra records. Default is no, because it could hamper future protocol developments that want to add records. Thanks to Xiang Li, from NISL Lab, Tsinghua University. With the `sock-queue-timeout: 3` option kernel timestamps are turned on for UDP queries, and old packets are dropped. Queries that have waited in the socket buffer for a long time are then discarded, and is useful if the host was not running for a while. The statistics has `num.queries_timed_out` and `query.queue_time_us.max` counters. The local-zone type `block_a` is for when queries to IPv4 have to be stopped to force IPv6 usage. It stops type A queries with nodata, and transparently allows other queries. The redis server can be contacted over a unix socket with `redis-server-path: "/var/lib/redis/redis-server.sock"`. The redis server password can be configured with `redis-server-password: "password"`. The number of hashtable collisions is logged in the statistics counters `msg.cache.max_collisions` and `rrset.cache.max_collisions`. It can be used to monitor for mistakes where the wrong or same hash value occurs too frequently. The repository does not have the bison and flex generated output in it, so these tools are necessary to compile from a checkout, the tarball distribution contains pregenerated files and can use either those files or bison and flex tools on the compile system. If kernel timestamps are enabled, with the sock-queue-timeout option, they are also used to set the time for dnstap logs. There is a yocto compatible init script available in the contrib directory of the source code, `unbound.init_yocto`. The number of cachedb hits from cache is output in `num.query.cachedb`. There is support for the dohpath parameter for the SVCB record type. Prefetch is supported for subnet cache entries. Detection of the python paths on the system has been expanded. Features - Merge #826: Аdd a metric about the maximum number of collisions in lrushah. - Set max-udp-size default to 1232. This is the same default value as the default value for edns-buffer-size. It restricts client edns buffer size choices, and makes unbound behave similar to other DNS resolvers. The new choice, down from 4096 means it is harder to get large responses from Unbound. Thanks to Xiang Li, from NISL Lab, Tsinghua University. - Add harden-unknown-additional option. It removes unknown records from the authority section and additional section. Thanks to Xiang Li, from NISL Lab, Tsinghua University. - Merge #819: Added new static zone type block_a to suppress all A queries for specific zones. - Fix #835: [FR] Ability to use Redis unix sockets. - Fix #833: [FR] Ability to set the Redis password. - Merge #882 from vvfedorenko: Features/dropqueuedpackets, with sock-queue-timeout option that drops packets that have been in the socket queue for too long. Added statistics num.queries_timed_out and query.queue_time_us.max that track the socket queue timeouts. - Merge #722 from David 'eqvinox' Lamparter: NAT64 support. - Fix #888: [FR] Use kernel timestamps for dnstap. - Merge #903: contrib: add yocto compatible init script. - Merge #892: Add cachedb hit stat. Introduces 'num.query.cachedb' as a new statistical counter. - Merge #739: Add SVCB dohpath support. - Merge #802: add validation EDEs to queries where the CD bit is set. - Merge #664 from tilan7763: Add prefetch support for subnet cache entries. - Merge #759 from Tom Carpay: Add EDE (RFC8914) caching. - Merge #790 from Tom Carpay: Add support for EDE caching in cachedb and subnetcache. - Merge PR #762: Downstream DNS Server Cookies a la RFC7873 and RFC9018. Create server cookies for clients that send client cookies. This needs to be explicitly turned on in the config file with: `answer-cookie: yes`. A `cookie-secret:` can be configured for anycast setups. Without one, a random cookie secret is generated. The acl option `allow_cookie` allows queries with either a valid cookie or over a stateful transport. The statistics output has `queries_cookie_valid` and `queries_cookie_client` and `queries_cookie_invalid` information. The `ip\-ratelimit\-cookie:` value determines a rate limit for queries with cookies, if desired. Bug Fixes - Fix #823: Response change to NODATA for some ANY queries since 1.12, tested on 1.16.1. - Fix python module install path detection. - Fix python version detection in configure. - Improve documentation for #826, describe the large collisions amount. - Fix not following cleared RD flags potentially enables amplification DDoS attacks, reported by Xiang Li and Wei Xu from NISL Lab, Tsinghua University. The fix stops query loops, by refusing to send RD=0 queries to a forwarder, they still get answered from cache. - Set default for harden-unknown-additional to no. So that it does not hamper future protocol developments. - Fix test for new default. - Fix acx_nlnetlabs.m4 for -Wstrict-prototypes. - Add duration variable for speed_local.test. - Fix #841: Unbound won't build with aaaa-filter-iterator.patch. - Fix to ignore entirely empty responses, and try at another authority. This turns completely empty responses, a type of noerror/nodata into a servfail, but they do not conform to RFC2308, and the retry can fetch improved content. - Fix unit tests for spurious empty messages. - Fix consistency of unit test without roundrobin answers for the cnametooptout unit test. - Fix to git ignore the library symbol file that configure can create. - Allow TTL refresh of expired error responses. - Add testcase for refreshing expired error responses. - Clean up iterator/iterator.c::error_response_cache() and allow for better interaction with serve-expired, prefetch and cached error responses. - Fix #825: Unexpected behavior with client-subnet-always-forward and serve-expired - Fix for #852: Completion of error handling. - Fix unbound-dnstap-socket test program to reply the finish frame over a TLS connection correctly. - Fix ssl.h include brackets, instead of quotes. - Fix #812, fix #846, by using the SSL_OP_IGNORE_UNEXPECTED_EOF option to ignore the unexpected eof while reading in openssl >= 3. - iana portlist update. - Fix issue #851: reserved identifier violation - Fix issue #676: Unencrypted query is sent when forward-tls-upstream: yes is used without tls-cert-bundle - Extra consistency check to make sure that when TLS is requested, either we set up a TLS connection or we return an error. - Fix #870: NXDOMAIN instead of NOERROR rcode when asked for existing CNAME record. - Fix for #870: Add test case for the qname minimisation and CNAME. - Fix build badge, from failing travis link to github ci action link. - Merge #875: change obsolete txt URL in unbound-anchor.c to point to RFC 7958, and Fix #874. - Fix for #878: Invalid IP address in unbound.conf causes Segmentation Fault on OpenBSD. - Fix for #882: small changes, date updated in Copyright for util/timeval_func.c and util/timeval_func.h. Man page entries and example entry. - Fix for #882: document variable to stop doxygen warning. - Fix issue #860: Bad interaction with 0 TTL records and serve-expired - Fix RPZ IP responses with trigger rpz-drop on cache entries, that they are dropped. - For #722: minor fixes, formatting, refactoring. - Fix #885: Error: util/configlexer.c: No such file or directory, adds error messages explaining to install flex and bison. - Fix to remove unused whitespace from acx_nlnetlabs.m4 and config.h. - Fix doxygen in addr_to_nat64 header definition. - Fix warning in windows compile, in set_recvtimestamp. - Fix to print debug log for ancillary data with correct IP address. - Fix RPZ removal of client-ip, nsip, nsdname triggers from IXFR. - Fix to remove unused variables from RPZ clientip data structure. - Fix unbound-dnstap-socket printout when no query is present. - Fix unbound-dnstap-socket time fraction conversion for printout. - Merge #896: Fix: #895: pythonmodule: add all site-packages directories to sys.path. - Fix #895: python + sysconfig gives ANOTHER path comparing to distutils. - Fix for uncertain unit test for doh buffer size events. - Properly handle all return values of worker_check_request during early EDE code. - Do not check the incoming request more than once. - Fix for issue #887 (Timeouts to forward servers on BSD based system with ASLR) - Probably fixes #516 (Stream reuse does not work on Windows) as well - Remove warning about unknown cast-function-type warning pragma. - Fix python modules with multiple scripts, by incrementing reference counts. - More fixes for reference counting for python module and clean up failure code. - Merge #827 from rcmcdonald91: Eliminate unnecessary Python reloading which causes memory leaks. - Fix #906: warning: ‘Py_SetProgramName’ is deprecated. - Fix dereference of NULL variable warning in mesh_do_callback. - Code cleanup for sldns_str2wire_svcparam_key_lookup. - For #802: Cleanup comments and add RCODE check for CD bit test case. - Skip the 00-lint test. splint is not maintained; it either does not work or produces false positives. Static analysis is handled in the clang test. - For #664: Easier code flow for subnetcache prefetching. - For #664: Add testcase. - For #664: Rename subnet_prefetch tests to subnet_global_prefetch to differentiate from the new subnet prefetch support. - Merge #880 from chipitsine: services/authzone.c: remove redundant check. - More clear description of the different auth-zone behaviors on the man page. - Merge #909 from headshog: Numeric truncation when parsing TYPEXX and CLASSXX representation. - For #909: Fix return values. - Merge #901 from Sergei Trofimovich: config: improve handling of unknown modules. - For #909: Fix RR class comparison. - Merge #857 from eaglegai: fix potential memory leaks when errors happen. - For #857: fix mixed declarations and code. - Merge #118 from mibere: Changed verbosity level for Redis init & deinit. - Merge #390 from Frank Riley: Add missing callbacks to the python module. - Cleaner failure code for callback functions in interface.i. - Merge #889 from borisVanhoof: Free memory in error case + remove unused function. - For #889: use netcat-openbsd instead of netcat-traditional. - For #889: Account for num_detached_states before possible mesh_state_delete when erroring out. - Fix unused variable compile warning for kernel timestamps in netevent.c - Merge #911 from natalie-reece: Exclude EDE before other EDNS options when there isn't enough space. - For #911: Try to trim EXTRA-TEXT (and LDNS_EDE_OTHER options altogether) before giving up on attaching EDE options. - More braces and formatting for Fix for EDNS EDE size calculation to avoid future bugs. - Fix to use the now cached EDE, if any, for CD_bit queries. - Fix for EDNS EDE size calculation. - Move a cache reply callback in worker.c closer to the cache reply generation. - Fix regional_alloc_init for potential unaligned source of the copy. - Fix ip_ratelimit test to work with dig that enables DNS cookies. - Fix for iter_dec_attempts that could cause a hang, part of capsforid and qname minimisation, depending on the settings. - Fix uninitialized memory passed in padding bytes of cmsg to sendmsg. - Fix stat_values test to work with dig that enables DNS cookies. - Debug Windows ci workflow. - Fix windows ci workflow to install bison and flex. - Fix for #925: unbound.service: Main process exited, code=killed, status=11/SEGV. Fixes cachedb configuration handling. - Fix #923: processQueryResponse() THROWAWAY should be mindful of fail_reply. - Fix unit test for unbound-control to work when threads are disabled, and fix cache dump check. - Fix compile error on NetBSD in util/netevent.h.
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release-1.17.1
90831af9 · ·Unbound 1.17.1 This release fixes a number of bugs. There are also new configuration options that by default do not change the existing behaviour of Unbound. With `statistics-inhibit-zero` the printout of zero values by stats can be controlled. Similarly with `max-sent-count` and `max-query-restarts` the iterator behaviour can be controlled. The maximum CNAME chain length that is accepted can be changed by increasing the `max-query-restarts` number. This takes more time to follow those elements. The keep-cache option allows reloads to change configuration whilst keeping the cache memory intact, making the cache hot for good response times after the change has completed. The release contains an additional fix for service downgrade due to wrong hash values for wildcards in a hyperlocal zone, that was reported by Sergey Kacheev. Features - Expose 'statistics-inhibit-zero' as a configuration option; the default value retains Unbound's behavior. - Expose 'max-sent-count' as a configuration option; the default value retains Unbound's behavior. - Merge #461 from Christian Allred: Add max-query-restarts option. Exposes an internal configuration but the default value retains Unbound's behavior. - Merge #569 from JINMEI Tatuya: add keep-cache option to 'unbound-control reload' to keep caches. Bug Fixes - Merge #768 from fobser: Arithmetic on a pointer to void is a GNU extension. - In unit test, print python script name list correctly. - testcode/dohclient sets log identity to its name. - Clarify the use of MAX_SENT_COUNT in the iterator code. - Fix that cachedb does not store failures in the external cache. - Merge #767 from jonathangray: consistently use IPv4/IPv6 in unbound.conf.5. - Fix to ignore tcp events for closed comm points. - Fix to make sure to not read again after a tcp comm point is closed. - Fix #775: libunbound: subprocess reap causes parent process reap to hang. - iana portlist update. - Complementary fix for distutils.sysconfig deprecation in Python 3.10 to commit 62c5039ab9da42713e006e840b7578e01d66e7f2. - Fix #779: [doc] Missing documention in ub_resolve_event() for callback parameter was_ratelimited. - Ignore expired error responses. - Merge #720 from jonathangray: fix use after free when WSACreateEvent() fails. - Fix for the ignore of tcp events for closed comm points, preserve the use after free protection features. - Fix #782: Segmentation fault in stats.c:404. - Add SVCB and HTTPS to the types removed by 'unbound-control flush'. - Clear documentation for interactivity between the subnet module and the serve-expired and prefetch configuration options. - Fix #773: When used with systemd-networkd, unbound does not start until systemd-networkd-wait-online.service times out. - Merge #808: Wrap Makefile script's directory variables in quotes. - Fix to wrap Makefile scripts directory in quotes for uninstall. - Fix windows compile for libunbound subprocess reap comm point closes. - Update github workflows to use checkout v3. - Fix wildcard in hyperlocal zone service degradation, reported by Sergey Kacheev.
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release-1.17.0
d25e0cd9 · ·Unbound 1.17.0 This release has new interface acl configuration options. These allow access-control actions, per interface. Also tags, and views can be configured per interface, queries over the interface are answered with these tags and views. It is configured with the options `interface-action`, `interface-tag`, `interface-tag-action`, `interface-tag-data` and `interface-view`. If there is also an access-control setting for the query, this overrides the interface settings for that query. The PROXYv2 protocol is supported. It can be configured with the `proxy-protocol-port: portno` option. It is used to convey the IP addresses of clients that connect via a proxy to Unbound. There are also fixes for a number of bugs. In some cases a blocking wait on a socket could happen, and this has been fixed. If the upstream sends a TC flag, erroneously, the reply is ignored and retried. When under load, with the new NRDelegation fixes from the previous release, there are mitigations to continue target discovery. There is also a fix for possible loops in the tcp reuse code. The release version differs from the RC1, there is a bugfix for the proxy protocol for tcp read when no proxied addresses are provided. Features - Merge #753: ACL per interface. (New interface-* configuration options). - Merge #760: PROXYv2 downstream support. (New proxy-protocol-port configuration option). Bug Fixes - Fix #728: alloc_reg_obtain() core dump. Stop double alloc_reg_release when serviced_create fails. - Fix edns subnet so that scope 0 answers only match sourcemask 0 queries for answers from cache if from a query with sourcemask 0. - Fix unittest for edns subnet change. - Merge #730 from luisdallos: Fix startup failure on Windows 8.1 due to unsupported IPV6_USER_MTU socket option being set. - Fix ratelimit inconsistency, for ip-ratelimits the value is the amount allowed, like for ratelimits. - Fix #734 [FR] enable unbound-checkconf to detect more (basic) errors. - Fix to log accept error ENFILE and EMFILE errno, but slowly, once per 10 seconds. Also log accept failures when no slow down is used. - Fix to avoid process wide fcntl calls mixed with nonblocking operations after a blocked write. - Patch from Vadim Fedorenko that adds MSG_DONTWAIT to receive operations, so that instruction reordering does not cause mistakenly blocking socket operations. - Fix to wait for blocked write on UDP sockets, with a timeout if it takes too long the packet is dropped. - Fix for wait for udp send to stop when packet is successfully sent. - Fix #741: systemd socket activation fails on IPv6. - Fix to update config tests to fix checking if nonblocking sockets work on OpenBSD. - Slow down log frequency of write wait failures. - Fix to set out of file descriptor warning to operational verbosity. - Fix to log a verbose message at operational notice level if a thread is not responding, to stats requests. It is logged with thread identifiers. - Remove include that was there for debug purposes. - Fix to check pthread_t size after pthread has been detected. - Convert tdir tests to use the new skip_test functionality. - Remove unused testcode/mini_tpkg.sh file. - Better output for skipped tdir tests. - Fix doxygen warning in respip.h. - Fix to remove erroneous TC flag from TCP upstream. - Fix test tdir skip report printout. - Fix windows compile, the identifier interface is defined in headers. - Fix to close errno block in comm_point_tcp_handle_read outside of ifdef. - Fix static analysis report to remove dead code from the rpz_callback_from_iterator_module function. - Fix to clean up after the acl_interface unit test. - Merge #764: Leniency for target discovery when under load (for NRDelegation changes). - Use DEBUG_TDIR from environment in mini_tdir.sh for debugging. - Fix string comparison in mini_tdir.sh. - Make ede.tdir test more predictable by using static data. - Fix checkconf test for dnscrypt and proxy port. - Fix dnscrypt compile for proxy protocol code changes. - Fix to stop responses with TC flag from resulting in partial responses. It retries to fetch the data elsewhere, or fails the query and in depth fix removes the TC flag from the cached item. - Fix proxy length debug output printout typecasts. - Fix to stop possible loops in the tcp reuse code (write_wait list and tcp_wait list). Based on analysis and patch from Prad Seniappan and Karthik Umashankar. - Fix PROXYv2 header read for TCP connections when no proxied addresses are provided.
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release-1.16.3
13771952 · ·Unbound 1.16.3 This release fixes CVE-2022-3204 Non-Responsive Delegation Attack. It was reported by Yehuda Afek from Tel-Aviv University and Anat Bremler-Barr and Shani Stajnrod from Reichman University. This fixes for better performance when under load, by cutting promiscuous queries for nameserver discovery and limiting the number of times a delegation point can look in the cache for missing records. Bug Fixes - Patch for CVE-2022-3204 Non-Responsive Delegation Attack.
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