2bf7921c7e
This commit converts the license handling to adhere to the REUSE
specification. It specifically:
1. Adds used licnses to LICENSES/ directory
2. Add "isc" template for adding the copyright boilerplate
3. Changes all source files to include copyright and SPDX license
header, this includes all the C sources, documentation, zone files,
configuration files. There are notes in the doc/dev/copyrights file
on how to add correct headers to the new files.
4. Handle the rest that can't be modified via .reuse/dep5 file. The
binary (or otherwise unmodifiable) files could have license places
next to them in <foo>.license file, but this would lead to cluttered
repository and most of the files handled in the .reuse/dep5 file are
system test files.
(cherry picked from commit 58bd26b6cf)
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.. Copyright (C) Internet Systems Consortium, Inc. ("ISC")
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..
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.. SPDX-License-Identifier: MPL-2.0
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..
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.. This Source Code Form is subject to the terms of the Mozilla Public
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.. License, v. 2.0. If a copy of the MPL was not distributed with this
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.. file, you can obtain one at https://mozilla.org/MPL/2.0/.
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..
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.. See the COPYRIGHT file distributed with this work for additional
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.. information regarding copyright ownership.
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Notes for BIND 9.16.15
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----------------------
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Security Fixes
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~~~~~~~~~~~~~~
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- A malformed incoming IXFR transfer could trigger an assertion failure
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in ``named``, causing it to quit abnormally. (CVE-2021-25214)
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ISC would like to thank Greg Kuechle of SaskTel for bringing this
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vulnerability to our attention. :gl:`#2467`
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- ``named`` crashed when a DNAME record placed in the ANSWER section
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during DNAME chasing turned out to be the final answer to a client
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query. (CVE-2021-25215)
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ISC would like to thank `Siva Kakarla`_ for bringing this
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vulnerability to our attention. :gl:`#2540`
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.. _Siva Kakarla: https://github.com/sivakesava1
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- When a server's configuration set the ``tkey-gssapi-keytab`` or
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``tkey-gssapi-credential`` option, a specially crafted GSS-TSIG query
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could cause a buffer overflow in the ISC implementation of SPNEGO (a
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protocol enabling negotiation of the security mechanism used for
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GSSAPI authentication). This flaw could be exploited to crash
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``named`` binaries compiled for 64-bit platforms, and could enable
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remote code execution when ``named`` was compiled for 32-bit
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platforms. (CVE-2021-25216)
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This vulnerability was reported to us as ZDI-CAN-13347 by Trend Micro
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Zero Day Initiative. :gl:`#2604`
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Feature Changes
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~~~~~~~~~~~~~~~
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- The ISC implementation of SPNEGO was removed from BIND 9 source code.
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Instead, BIND 9 now always uses the SPNEGO implementation provided by
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the system GSSAPI library when it is built with GSSAPI support. All
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major contemporary Kerberos/GSSAPI libraries contain an implementation
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of the SPNEGO mechanism. :gl:`#2607`
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- The default value for the ``stale-answer-client-timeout`` option was
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changed from ``1800`` (ms) to ``off``. The default value may be
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changed again in future releases as this feature matures. :gl:`#2608`
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Bug Fixes
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~~~~~~~~~
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- TCP idle and initial timeouts were being incorrectly applied: only the
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``tcp-initial-timeout`` was applied on the whole connection, even if
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the connection were still active, which could prevent a large zone
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transfer from being sent back to the client. The default setting for
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``tcp-initial-timeout`` was 30 seconds, which meant that any TCP
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connection taking more than 30 seconds was abruptly terminated. This
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has been fixed. :gl:`#2583`
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- When ``stale-answer-client-timeout`` was set to a positive value and
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recursion for a client query completed when ``named`` was about to
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look for a stale answer, an assertion could fail in
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``query_respond()``, resulting in a crash. This has been fixed.
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:gl:`#2594`
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- If zone journal files written by BIND 9.16.11 or earlier were present
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when BIND was upgraded to BIND 9.16.13 or BIND 9.16.14, the zone file
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for that zone could have been inadvertently rewritten with the current
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zone contents. This caused the original zone file structure (e.g.
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comments, ``$INCLUDE`` directives) to be lost, although the zone data
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itself was preserved. :gl:`#2623`
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- After upgrading to BIND 9.16.13, journal files for trust anchor
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databases (e.g. ``managed-keys.bind.jnl``) could be left in a corrupt
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state. (Other zone journal files were not affected.) This has been
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fixed. If a corrupt journal file is detected, ``named`` can now
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recover from it. :gl:`#2600`
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- When sending queries over TCP, ``dig`` now properly handles ``+tries=1
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+retry=0`` by not retrying the connection when the remote server
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closes the connection prematurely. :gl:`#2490`
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- CDS/CDNSKEY DELETE records are now removed when a zone transitions
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from a secure to an insecure state. ``named-checkzone`` also no longer
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reports an error when such records are found in an unsigned zone.
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:gl:`#2517`
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- Zones using KASP could not be thawed after they were frozen using
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``rndc freeze``. This has been fixed. :gl:`#2523`
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- After ``rndc checkds -checkds`` or ``rndc dnssec -rollover`` is used,
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``named`` now immediately attempts to reconfigure zone keys. This
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change prevents unnecessary key rollover delays. :gl:`#2488`
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- Previously, a memory leak could occur when ``named`` failed to bind a
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UDP socket to a network interface. This has been fixed. :gl:`#2575`
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