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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="id-1.2"></a>Release Notes for BIND Version 9.12.0-pre-alpha</h2></div></div></div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="relnotes_intro"></a>Introduction</h3></div></div></div>
<p>
BIND 9.12.0 is a new feature release of BIND, still under development.
This document summarizes new features and functional changes that
have been introduced on this branch. With each development
release leading up to the final BIND 9.12.0 release, this document
will be updated with additional features added and bugs fixed.
</p>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="relnotes_download"></a>Download</h3></div></div></div>
<p>
The latest versions of BIND 9 software can always be found at
<a class="link" href="http://www.isc.org/downloads/" target="_top">http://www.isc.org/downloads/</a>.
There you will find additional information about each release,
source code, and pre-compiled versions for Microsoft Windows
operating systems.
</p>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="relnotes_license"></a>License Change</h3></div></div></div>
<p>
With the release of BIND 9.11.0, ISC changed to the open
source license for BIND from the ISC license to the Mozilla
Public License (MPL 2.0).
</p>
<p>
The MPL-2.0 license requires that if you make changes to
licensed software (e.g. BIND) and distribute them outside
your organization, that you publish those changes under that
same license. It does not require that you publish or disclose
anything other than the changes you made to our software.
</p>
<p>
This new requirement will not affect anyone who is using BIND
without redistributing it, nor anyone redistributing it without
changes, therefore this change will be without consequence
for most individuals and organizations who are using BIND.
</p>
<p>
Those unsure whether or not the license change affects their
use of BIND, or who wish to discuss how to comply with the
license may contact ISC at <a class="link" href="https://www.isc.org/mission/contact/" target="_top">
https://www.isc.org/mission/contact/</a>.
</p>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="relnotes_security"></a>Security Fixes</h3></div></div></div>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem"><p>
<span class="command"><strong>rndc ""</strong></span> could trigger an assertion failure
in <span class="command"><strong>named</strong></span>. This flaw is disclosed in
(CVE-2017-3138). [RT #44924]
</p></li>
<li class="listitem"><p>
Some chaining (i.e., type CNAME or DNAME) responses to upstream
queries could trigger assertion failures. This flaw is disclosed
in CVE-2017-3137. [RT #44734]
</p></li>
<li class="listitem"><p>
<span class="command"><strong>dns64</strong></span> with <span class="command"><strong>break-dnssec yes;</strong></span>
can result in an assertion failure. This flaw is disclosed in
CVE-2017-3136. [RT #44653]
</p></li>
<li class="listitem"><p>
If a server is configured with a response policy zone (RPZ)
that rewrites an answer with local data, and is also configured
for DNS64 address mapping, a NULL pointer can be read
triggering a server crash. This flaw is disclosed in
CVE-2017-3135. [RT #44434]
</p></li>
<li class="listitem"><p>
A coding error in the <code class="option">nxdomain-redirect</code>
feature could lead to an assertion failure if the redirection
namespace was served from a local authoritative data source
such as a local zone or a DLZ instead of via recursive
lookup. This flaw is disclosed in CVE-2016-9778. [RT #43837]
</p></li>
<li class="listitem"><p>
<span class="command"><strong>named</strong></span> could mishandle authority sections
with missing RRSIGs, triggering an assertion failure. This
flaw is disclosed in CVE-2016-9444. [RT #43632]
</p></li>
<li class="listitem"><p>
<span class="command"><strong>named</strong></span> mishandled some responses where
covering RRSIG records were returned without the requested
data, resulting in an assertion failure. This flaw is
disclosed in CVE-2016-9147. [RT #43548]
</p></li>
<li class="listitem"><p>
<span class="command"><strong>named</strong></span> incorrectly tried to cache TKEY
records which could trigger an assertion failure when there was
a class mismatch. This flaw is disclosed in CVE-2016-9131.
[RT #43522]
</p></li>
<li class="listitem"><p>
It was possible to trigger assertions when processing
responses containing answers of type DNAME. This flaw is
disclosed in CVE-2016-8864. [RT #43465]
</p></li>
<li class="listitem"><p>
Added the ability to specify the maximum number of records
permitted in a zone (<code class="option">max-records #;</code>).
This provides a mechanism to block overly large zone
transfers, which is a potential risk with slave zones from
other parties, as described in CVE-2016-6170.
[RT #42143]
</p></li>
</ul></div>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="relnotes_features"></a>New Features</h3></div></div></div>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
<p>
Many aspects of <span class="command"><strong>named</strong></span> have been modified
to improve query performance, and in particular, performance
for delegation-heavy zones:
</p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: circle; ">
<li class="listitem"><p>
The additional cache ("acache") was found not to
significantly improve performance and has been removed;
the <span class="command"><strong>acache-enable</strong></span> and
<span class="command"><strong>acache-cleaning-interval</strong></span> options are now
deprecated.
</p></li>
<li class="listitem"><p>
In place of the acache, <span class="command"><strong>named</strong></span> now uses
a glue cache to speed up retrieval of glue records when sending
delegation responses.
</p></li>
<li class="listitem"><p>
The <span class="command"><strong>additional-from-cache</strong></span>
and <span class="command"><strong>additional-from-auth</strong></span> options have been
deprecated.
</p></li>
<li class="listitem"><p>
<span class="command"><strong>minimal-responses</strong></span> is now set
to <code class="literal">yes</code> by default.
</p></li>
<li class="listitem"><p>
Several functions have been refactored to improve
performance, including name compression, owner name
case restoration, hashing, and buffers.
</p></li>
</ul></div>
</li>
<li class="listitem"><p>
The <span class="command"><strong>dnstap-read -x</strong></span> option prints a hex
dump of the wire format DNS message encapsulated in each
<span class="command"><strong>dnstap</strong></span> log entry. [RT #44816]
</p></li>
<li class="listitem"><p>
The <span class="command"><strong>host -A</strong></span> option returns most
records for a name, but omits types RRSIG, NSEC and NSEC3.
</p></li>
<li class="listitem"><p>
Query logic has been substantially refactored (e.g. query_find
function has been split into smaller functions) for improved
readability, maintainability and testability. [RT #43929]
</p></li>
<li class="listitem"><p>
<span class="command"><strong>dnstap</strong></span> logfiles can now be configured to
automatically roll when they reach a specified size. If
<span class="command"><strong>dnstap-output</strong></span> is configured with mode
<code class="literal">file</code>, then it can take optional
<span class="command"><strong>size</strong></span> and <span class="command"><strong>versions</strong></span>
key-value arguments to set the logfile rolling parameters.
(These have the same semantics as the corresponding
options in a <span class="command"><strong>logging</strong></span> channel statement.)
[RT #44502]
</p></li>
<li class="listitem"><p>
Logging channels and <span class="command"><strong>dnstap-output</strong></span> files can
now be configured with a <span class="command"><strong>suffix</strong></span> option,
set to either <code class="literal">increment</code> or
<code class="literal">timestamp</code>, indicating whether log files
should be given incrementing suffixes when they roll
over (e.g., <code class="filename">logfile.0</code>,
<code class="filename">.1</code>, <code class="filename">.2</code>, etc)
or suffixes indicating the time of the roll. The default
is <code class="literal">increment</code>. [RT #42838]
</p></li>
<li class="listitem"><p>
<span class="command"><strong>dig +ednsopt</strong></span> now accepts the names
for EDNS options in addition to numeric values. For example,
an EDNS Client-Subnet option could be sent using
<span class="command"><strong>dig +ednsopt=ecs:...</strong></span>. Thanks to
John Worley of Secure64 for the contribution. [RT #44461]
</p></li>
<li class="listitem"><p>
Added support for the EDNS TCP Keepalive option (RFC 7828);
this allows negotiation of longer-lived TCP sessions
to reduce the overhead of setting up TCP for individual
queries. [RT #42126]
</p></li>
<li class="listitem"><p>
Added support for the EDNS Padding option (RFC 7830),
which obfuscates packet size analysis when DNS queries
are sent over an encrypted channel. [RT #42094]
</p></li>
<li class="listitem"><p>
The <code class="option">print-time</code> option in the
<code class="option">logging</code> configuration can now take arguments
<strong class="userinput"><code>local</code></strong>, <strong class="userinput"><code>iso8601</code></strong> or
<strong class="userinput"><code>iso8601-utc</code></strong> to indicate the format in
which the date and time should be logged. For backward
compatibility, <strong class="userinput"><code>yes</code></strong> is a synonym for
<strong class="userinput"><code>local</code></strong>. [RT #42585]
</p></li>
<li class="listitem">
<p>
<span class="command"><strong>rndc</strong></span> commands which refer to zone names
can now reference a zone of type <span class="command"><strong>redirect</strong></span>
by using the special zone name "-redirect". (Previously this
was not possible because <span class="command"><strong>redirect</strong></span> zones
always have the name ".", which can be ambiguous.)
</p>
<p>
In the event you need to manipulate a zone actually
called "-redirect", use a trailing dot: "-redirect."
</p>
<p>
Note: This change does not appply to the
<span class="command"><strong>rndc addzone</strong></span> or
<span class="command"><strong>rndc modzone</strong></span> commands.
</p>
</li>
<li class="listitem"><p>
<span class="command"><strong>named-checkconf -l</strong></span> lists the zones found
in <code class="filename">named.conf</code>. [RT #43154]
</p></li>
<li class="listitem"><p>
Query logging now includes the ECS option, if one was
present in the query, in the format
"[ECS <em class="replaceable"><code>address/source/scope</code></em>]".
</p></li>
</ul></div>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="relnotes_changes"></a>Feature Changes</h3></div></div></div>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem"><p>
Threads in <span class="command"><strong>named</strong></span> are now set to human-readable
names to assist debugging on operating systems that support that.
Threads will have names such as "isc-timer", "isc-sockmgr",
"isc-worker0001", and so on. This will affect the reporting of
subsidiary thread names in <span class="command"><strong>ps</strong></span> and
<span class="command"><strong>top</strong></span>, but not the main thread. [RT #43234]
</p></li>
<li class="listitem"><p>
The Response Policy Zone (RPZ) implementation has been
substantially refactored: updates to the RPZ summary
database are no longer directly performed by the zone
database but by a separate function that is called when
a policy zone is updated. This improves both performance
and reliability when policy zones receive frequent updates.
Summary database updates can be rate-limited by using the
<span class="command"><strong>min-update-interval</strong></span> option in a
<span class="command"><strong>response-policy</strong></span> statement. [RT #43449]
</p></li>
<li class="listitem"><p>
<span class="command"><strong>dnstap</strong></span> now stores both the local and remote
addresses for all messages, instead of only the remote address.
The default output format for <span class="command"><strong>dnstap-read</strong></span> has
been updated to include these addresses, with the initiating
address first and the responding address second, separated by
"-%gt;" or "%lt;-" to indicate in which direction the message
was sent. [RT #43595]
</p></li>
<li class="listitem"><p>
Expanded and improved the YAML output from
<span class="command"><strong>dnstap-read -y</strong></span>: it now includes packet
size and a detailed breakdown of message contents.
[RT #43622] [RT #43642]
</p></li>
<li class="listitem"><p>
If an ACL is specified with an address prefix in which the
prefix length is longer than the address portion (for example,
192.0.2.1/8), it will now be treated as a fatal error during
configuration. [RT #43367]
</p></li>
</ul></div>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="relnotes_bugs"></a>Bug Fixes</h3></div></div></div>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p>
None.
</p></li></ul></div>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="end_of_life"></a>End of Life</h3></div></div></div>
<p>
The end of life for BIND 9.12 is yet to be determined but
will not be before BIND 9.14.0 has been released for 6 months.
<a class="link" href="https://www.isc.org/downloads/software-support-policy/" target="_top">https://www.isc.org/downloads/software-support-policy/</a>
</p>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="relnotes_thanks"></a>Thank You</h3></div></div></div>
<p>
Thank you to everyone who assisted us in making this release possible.
If you would like to contribute to ISC to assist us in continuing to
make quality open source software, please visit our donations page at
<a class="link" href="http://www.isc.org/donate/" target="_top">http://www.isc.org/donate/</a>.
</p>
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