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<h1><a href="../index.html">MIT Kerberos Documentation</a></h1>
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<section id="realm-configuration-decisions">
<h1>Realm configuration decisions<a class="headerlink" href="#realm-configuration-decisions" title="Link to this heading"></a></h1>
<p>Before installing Kerberos V5, it is necessary to consider the
following issues:</p>
<ul class="simple">
<li><p>The name of your Kerberos realm (or the name of each realm, if you
need more than one).</p></li>
<li><p>How you will assign your hostnames to Kerberos realms.</p></li>
<li><p>Which ports your KDC and and kadmind services will use, if they will
not be using the default ports.</p></li>
<li><p>How many replica KDCs you need and where they should be located.</p></li>
<li><p>The hostnames of your primary and replica KDCs.</p></li>
<li><p>How frequently you will propagate the database from the primary KDC
to the replica KDCs.</p></li>
</ul>
<section id="realm-name">
<h2>Realm name<a class="headerlink" href="#realm-name" title="Link to this heading"></a></h2>
<p>Although your Kerberos realm can be any ASCII string, convention is to
make it the same as your domain name, in upper-case letters.</p>
<p>For example, hosts in the domain <code class="docutils literal notranslate"><span class="pre">example.com</span></code> would be in the
Kerberos realm:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">EXAMPLE</span><span class="o">.</span><span class="n">COM</span>
</pre></div>
</div>
<p>If you need multiple Kerberos realms, MIT recommends that you use
descriptive names which end with your domain name, such as:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">BOSTON</span><span class="o">.</span><span class="n">EXAMPLE</span><span class="o">.</span><span class="n">COM</span>
<span class="n">HOUSTON</span><span class="o">.</span><span class="n">EXAMPLE</span><span class="o">.</span><span class="n">COM</span>
</pre></div>
</div>
</section>
<section id="mapping-hostnames-onto-kerberos-realms">
<span id="mapping-hostnames"></span><h2>Mapping hostnames onto Kerberos realms<a class="headerlink" href="#mapping-hostnames-onto-kerberos-realms" title="Link to this heading"></a></h2>
<p>Mapping hostnames onto Kerberos realms is done in one of three ways.</p>
<p>The first mechanism works through a set of rules in the
<a class="reference internal" href="conf_files/krb5_conf.html#domain-realm"><span class="std std-ref">[domain_realm]</span></a> section of <a class="reference internal" href="conf_files/krb5_conf.html#krb5-conf-5"><span class="std std-ref">krb5.conf</span></a>. You can specify
mappings for an entire domain or on a per-hostname basis. Typically
you would do this by specifying the mappings for a given domain or
subdomain and listing the exceptions.</p>
<p>The second mechanism is to use KDC host-based service referrals. With
this method, the KDC’s krb5.conf has a full [domain_realm] mapping for
hosts, but the clients do not, or have mappings for only a subset of
the hosts they might contact. When a client needs to contact a server
host for which it has no mapping, it will ask the client realm’s KDC
for the service ticket, and will receive a referral to the appropriate
service realm.</p>
<p>To use referrals, clients must be running MIT krb5 1.6 or later, and
the KDC must be running MIT krb5 1.7 or later. The
<strong>host_based_services</strong> and <strong>no_host_referral</strong> variables in the
<a class="reference internal" href="conf_files/kdc_conf.html#kdc-realms"><span class="std std-ref">[realms]</span></a> section of <a class="reference internal" href="conf_files/kdc_conf.html#kdc-conf-5"><span class="std std-ref">kdc.conf</span></a> can be used to
fine-tune referral behavior on the KDC.</p>
<p>It is also possible for clients to use DNS TXT records, if
<strong>dns_lookup_realm</strong> is enabled in <a class="reference internal" href="conf_files/krb5_conf.html#krb5-conf-5"><span class="std std-ref">krb5.conf</span></a>. Such lookups
are disabled by default because DNS is an insecure protocol and security
holes could result if DNS records are spoofed. If enabled, the client
will try to look up a TXT record formed by prepending the prefix
<code class="docutils literal notranslate"><span class="pre">_kerberos</span></code> to the hostname in question. If that record is not
found, the client will attempt a lookup by prepending <code class="docutils literal notranslate"><span class="pre">_kerberos</span></code> to the
host’s domain name, then its parent domain, up to the top-level domain.
For the hostname <code class="docutils literal notranslate"><span class="pre">boston.engineering.example.com</span></code>, the names looked up
would be:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">_kerberos</span><span class="o">.</span><span class="n">boston</span><span class="o">.</span><span class="n">engineering</span><span class="o">.</span><span class="n">example</span><span class="o">.</span><span class="n">com</span>
<span class="n">_kerberos</span><span class="o">.</span><span class="n">engineering</span><span class="o">.</span><span class="n">example</span><span class="o">.</span><span class="n">com</span>
<span class="n">_kerberos</span><span class="o">.</span><span class="n">example</span><span class="o">.</span><span class="n">com</span>
<span class="n">_kerberos</span><span class="o">.</span><span class="n">com</span>
</pre></div>
</div>
<p>The value of the first TXT record found is taken as the realm name.</p>
<p>Even if you do not choose to use this mechanism within your site,
you may wish to set it up anyway, for use when interacting with other sites.</p>
</section>
<section id="ports-for-the-kdc-and-admin-services">
<h2>Ports for the KDC and admin services<a class="headerlink" href="#ports-for-the-kdc-and-admin-services" title="Link to this heading"></a></h2>
<p>The default ports used by Kerberos are port 88 for the KDC and port
749 for the admin server. You can, however, choose to run on other
ports, as long as they are specified in each host’s
<a class="reference internal" href="conf_files/krb5_conf.html#krb5-conf-5"><span class="std std-ref">krb5.conf</span></a> files or in DNS SRV records, and the
<a class="reference internal" href="conf_files/kdc_conf.html#kdc-conf-5"><span class="std std-ref">kdc.conf</span></a> file on each KDC. For a more thorough treatment of
port numbers used by the Kerberos V5 programs, refer to the
<a class="reference internal" href="appl_servers.html#conf-firewall"><span class="std std-ref">Configuring your firewall to work with Kerberos V5</span></a>.</p>
</section>
<section id="replica-kdcs">
<h2>Replica KDCs<a class="headerlink" href="#replica-kdcs" title="Link to this heading"></a></h2>
<p>Replica KDCs provide an additional source of Kerberos ticket-granting
services in the event of inaccessibility of the primary KDC. The
number of replica KDCs you need and the decision of where to place them,
both physically and logically, depends on the specifics of your
network.</p>
<p>Kerberos authentication requires that each client be able to contact a
KDC. Therefore, you need to anticipate any likely reason a KDC might
be unavailable and have a replica KDC to take up the slack.</p>
<p>Some considerations include:</p>
<ul class="simple">
<li><p>Have at least one replica KDC as a backup, for when the primary KDC
is down, is being upgraded, or is otherwise unavailable.</p></li>
<li><p>If your network is split such that a network outage is likely to
cause a network partition (some segment or segments of the network
to become cut off or isolated from other segments), have a replica
KDC accessible to each segment.</p></li>
<li><p>If possible, have at least one replica KDC in a different building
from the primary, in case of power outages, fires, or other
localized disasters.</p></li>
</ul>
</section>
<section id="hostnames-for-kdcs">
<span id="kdc-hostnames"></span><h2>Hostnames for KDCs<a class="headerlink" href="#hostnames-for-kdcs" title="Link to this heading"></a></h2>
<p>MIT recommends that your KDCs have a predefined set of CNAME records
(DNS hostname aliases), such as <code class="docutils literal notranslate"><span class="pre">kerberos</span></code> for the primary KDC and
<code class="docutils literal notranslate"><span class="pre">kerberos-1</span></code>, <code class="docutils literal notranslate"><span class="pre">kerberos-2</span></code>, … for the replica KDCs. This way,
if you need to swap a machine, you only need to change a DNS entry,
rather than having to change hostnames.</p>
<p>As of MIT krb5 1.4, clients can locate a realm’s KDCs through DNS
using SRV records (<span class="target" id="index-0"></span><a class="rfc reference external" href="https://datatracker.ietf.org/doc/html/rfc2782.html"><strong>RFC 2782</strong></a>), assuming the Kerberos realm name is
also a DNS domain name. These records indicate the hostname and port
number to contact for that service, optionally with weighting and
prioritization. The domain name used in the SRV record name is the
realm name. Several different Kerberos-related service names are
used:</p>
<dl>
<dt>_kerberos._udp</dt><dd><p>This is for contacting any KDC by UDP. This entry will be used
the most often. Normally you should list port 88 on each of your
KDCs.</p>
</dd>
<dt>_kerberos._tcp</dt><dd><p>This is for contacting any KDC by TCP. Normally you should use
port 88. This entry should be omitted if the KDC does not listen
on TCP ports, as was the default prior to release 1.13.</p>
</dd>
<dt>_kerberos-master._udp</dt><dd><p>This entry should refer to those KDCs, if any, that will
immediately see password changes to the Kerberos database. If a
user is logging in and the password appears to be incorrect, the
client will retry with the primary KDC before failing with an
“incorrect password” error given.</p>
<p>If you have only one KDC, or for whatever reason there is no
accessible KDC that would get database changes faster than the
others, you do not need to define this entry.</p>
</dd>
<dt>_kerberos-adm._tcp</dt><dd><p>This should list port 749 on your primary KDC. Support for it is
not complete at this time, but it will eventually be used by the
<a class="reference internal" href="admin_commands/kadmin_local.html#kadmin-1"><span class="std std-ref">kadmin</span></a> program and related utilities. For now, you will
also need the <strong>admin_server</strong> variable in <a class="reference internal" href="conf_files/krb5_conf.html#krb5-conf-5"><span class="std std-ref">krb5.conf</span></a>.</p>
</dd>
<dt>_kerberos-master._tcp</dt><dd><p>The corresponding TCP port for _kerberos-master._udp, assuming the
primary KDC listens on a TCP port.</p>
</dd>
<dt>_kpasswd._udp</dt><dd><p>This entry should list port 464 on your primary KDC. It is used
when a user changes her password. If this entry is not defined
but a _kerberos-adm._tcp entry is defined, the client will use the
_kerberos-adm._tcp entry with the port number changed to 464.</p>
</dd>
<dt>_kpasswd._tcp</dt><dd><p>The corresponding TCP port for _kpasswd._udp.</p>
</dd>
</dl>
<p>The DNS SRV specification requires that the hostnames listed be the
canonical names, not aliases. So, for example, you might include the
following records in your (BIND-style) zone file:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ORIGIN foobar.com.
_kerberos TXT &quot;FOOBAR.COM&quot;
kerberos CNAME daisy
kerberos-1 CNAME use-the-force-luke
kerberos-2 CNAME bunny-rabbit
_kerberos._udp SRV 0 0 88 daisy
SRV 0 0 88 use-the-force-luke
SRV 0 0 88 bunny-rabbit
_kerberos-master._udp SRV 0 0 88 daisy
_kerberos-adm._tcp SRV 0 0 749 daisy
_kpasswd._udp SRV 0 0 464 daisy
</pre></div>
</div>
<p>Clients can also be configured with the explicit location of services
using the <strong>kdc</strong>, <strong>master_kdc</strong>, <strong>admin_server</strong>, and
<strong>kpasswd_server</strong> variables in the <a class="reference internal" href="conf_files/krb5_conf.html#realms"><span class="std std-ref">[realms]</span></a> section of
<a class="reference internal" href="conf_files/krb5_conf.html#krb5-conf-5"><span class="std std-ref">krb5.conf</span></a>. Even if some clients will be configured with
explicit server locations, providing SRV records will still benefit
unconfigured clients, and be useful for other sites.</p>
<p>Clients can be configured with the <strong>sitename</strong> realm variable (new in
release 1.22). If a site name is set, the client first attempts SRV
record lookups with “.*sitename*._sites” inserted after the service
and protocol name and before the Kerberos realm. Site-specific
records may indicate servers more proximal to the client, allowing for
faster access.</p>
</section>
<section id="kdc-discovery">
<span id="id1"></span><h2>KDC Discovery<a class="headerlink" href="#kdc-discovery" title="Link to this heading"></a></h2>
<p>As of MIT krb5 1.15, clients can also locate KDCs in DNS through URI
records (<span class="target" id="index-1"></span><a class="rfc reference external" href="https://datatracker.ietf.org/doc/html/rfc7553.html"><strong>RFC 7553</strong></a>). Limitations with the SRV record format may
result in extra DNS queries in situations where a client must failover
to other transport types, or find a primary server. The URI record
can convey more information about a realm’s KDCs with a single query.</p>
<p>The client performs a query for the following URI records:</p>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">_kerberos.REALM</span></code> for finding KDCs.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">_kerberos-adm.REALM</span></code> for finding kadmin services.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">_kpasswd.REALM</span></code> for finding password services.</p></li>
</ul>
<p>The URI record includes a priority, weight, and a URI string that
consists of case-insensitive colon separated fields, in the form
<code class="docutils literal notranslate"><span class="pre">scheme:[flags]:transport:residual</span></code>.</p>
<ul class="simple">
<li><p><em>scheme</em> defines the registered URI type. It should always be
<code class="docutils literal notranslate"><span class="pre">krb5srv</span></code>.</p></li>
<li><p><em>flags</em> contains zero or more flag characters. Currently the only
valid flag is <code class="docutils literal notranslate"><span class="pre">m</span></code>, which indicates that the record is for a
primary server.</p></li>
<li><p><em>transport</em> defines the transport type of the residual URL or
address. Accepted values are <code class="docutils literal notranslate"><span class="pre">tcp</span></code>, <code class="docutils literal notranslate"><span class="pre">udp</span></code>, or <code class="docutils literal notranslate"><span class="pre">kkdcp</span></code> for the
MS-KKDCP type.</p></li>
<li><p><em>residual</em> contains the hostname, IP address, or URL to be
contacted using the specified transport, with an optional port
extension. The MS-KKDCP transport type uses a HTTPS URL, and can
include a port and/or path extension.</p></li>
</ul>
<p>An example of URI records in a zone file:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">_kerberos</span><span class="o">.</span><span class="n">EXAMPLE</span><span class="o">.</span><span class="n">COM</span> <span class="n">URI</span> <span class="mi">10</span> <span class="mi">1</span> <span class="n">krb5srv</span><span class="p">:</span><span class="n">m</span><span class="p">:</span><span class="n">tcp</span><span class="p">:</span><span class="n">kdc1</span><span class="o">.</span><span class="n">example</span><span class="o">.</span><span class="n">com</span>
<span class="n">URI</span> <span class="mi">20</span> <span class="mi">1</span> <span class="n">krb5srv</span><span class="p">:</span><span class="n">m</span><span class="p">:</span><span class="n">udp</span><span class="p">:</span><span class="n">kdc2</span><span class="o">.</span><span class="n">example</span><span class="o">.</span><span class="n">com</span><span class="p">:</span><span class="mi">89</span>
<span class="n">URI</span> <span class="mi">40</span> <span class="mi">1</span> <span class="n">krb5srv</span><span class="p">::</span><span class="n">udp</span><span class="p">:</span><span class="mf">10.10.0.23</span>
<span class="n">URI</span> <span class="mi">30</span> <span class="mi">1</span> <span class="n">krb5srv</span><span class="p">::</span><span class="n">kkdcp</span><span class="p">:</span><span class="n">https</span><span class="p">:</span><span class="o">//</span><span class="n">proxy</span><span class="p">:</span><span class="mi">89</span><span class="o">/</span><span class="n">auth</span>
</pre></div>
</div>
<p>URI lookups are enabled by default, and can be disabled by setting
<strong>dns_uri_lookup</strong> in the <a class="reference internal" href="conf_files/krb5_conf.html#libdefaults"><span class="std std-ref">[libdefaults]</span></a> section of
<a class="reference internal" href="conf_files/krb5_conf.html#krb5-conf-5"><span class="std std-ref">krb5.conf</span></a> to False. When enabled, URI lookups take
precedence over SRV lookups, falling back to SRV lookups if no URI
records are found.</p>
<p>The <strong>sitename</strong> variable in the <a class="reference internal" href="conf_files/krb5_conf.html#realms"><span class="std std-ref">[realms]</span></a> section of
<a class="reference internal" href="conf_files/krb5_conf.html#krb5-conf-5"><span class="std std-ref">krb5.conf</span></a> applies to URI lookups as well as SRV lookups.</p>
</section>
<section id="database-propagation">
<span id="db-prop"></span><h2>Database propagation<a class="headerlink" href="#database-propagation" title="Link to this heading"></a></h2>
<p>The Kerberos database resides on the primary KDC, and must be
propagated regularly (usually by a cron job) to the replica KDCs. In
deciding how frequently the propagation should happen, you will need
to balance the amount of time the propagation takes against the
maximum reasonable amount of time a user should have to wait for a
password change to take effect.</p>
<p>If the propagation time is longer than this maximum reasonable time
(e.g., you have a particularly large database, you have a lot of
replicas, or you experience frequent network delays), you may wish to
cut down on your propagation delay by performing the propagation in
parallel. To do this, have the primary KDC propagate the database to
one set of replicas, and then have each of these replicas propagate
the database to additional replicas.</p>
<p>See also <a class="reference internal" href="database.html#incr-db-prop"><span class="std std-ref">Incremental database propagation</span></a></p>
</section>
</section>
<div class="clearer"></div>
</div>
</div>
</div>
</div>
<div class="sidebar">
<h2>On this page</h2>
<ul>
<li><a class="reference internal" href="#">Realm configuration decisions</a><ul>
<li><a class="reference internal" href="#realm-name">Realm name</a></li>
<li><a class="reference internal" href="#mapping-hostnames-onto-kerberos-realms">Mapping hostnames onto Kerberos realms</a></li>
<li><a class="reference internal" href="#ports-for-the-kdc-and-admin-services">Ports for the KDC and admin services</a></li>
<li><a class="reference internal" href="#replica-kdcs">Replica KDCs</a></li>
<li><a class="reference internal" href="#hostnames-for-kdcs">Hostnames for KDCs</a></li>
<li><a class="reference internal" href="#kdc-discovery">KDC Discovery</a></li>
<li><a class="reference internal" href="#database-propagation">Database propagation</a></li>
</ul>
</li>
</ul>
<br/>
<h2>Table of contents</h2>
<ul class="current">
<li class="toctree-l1"><a class="reference internal" href="../user/index.html">For users</a></li>
<li class="toctree-l1 current"><a class="reference internal" href="index.html">For administrators</a><ul class="current">
<li class="toctree-l2"><a class="reference internal" href="install.html">Installation guide</a></li>
<li class="toctree-l2"><a class="reference internal" href="conf_files/index.html">Configuration Files</a></li>
<li class="toctree-l2 current"><a class="current reference internal" href="#">Realm configuration decisions</a></li>
<li class="toctree-l2"><a class="reference internal" href="database.html">Database administration</a></li>
<li class="toctree-l2"><a class="reference internal" href="dbtypes.html">Database types</a></li>
<li class="toctree-l2"><a class="reference internal" href="lockout.html">Account lockout</a></li>
<li class="toctree-l2"><a class="reference internal" href="conf_ldap.html">Configuring Kerberos with OpenLDAP back-end</a></li>
<li class="toctree-l2"><a class="reference internal" href="appl_servers.html">Application servers</a></li>
<li class="toctree-l2"><a class="reference internal" href="host_config.html">Host configuration</a></li>
<li class="toctree-l2"><a class="reference internal" href="backup_host.html">Backups of secure hosts</a></li>
<li class="toctree-l2"><a class="reference internal" href="pkinit.html">PKINIT configuration</a></li>
<li class="toctree-l2"><a class="reference internal" href="otp.html">OTP Preauthentication</a></li>
<li class="toctree-l2"><a class="reference internal" href="spake.html">SPAKE Preauthentication</a></li>
<li class="toctree-l2"><a class="reference internal" href="dictionary.html">Addressing dictionary attack risks</a></li>
<li class="toctree-l2"><a class="reference internal" href="princ_dns.html">Principal names and DNS</a></li>
<li class="toctree-l2"><a class="reference internal" href="enctypes.html">Encryption types</a></li>
<li class="toctree-l2"><a class="reference internal" href="https.html">HTTPS proxy configuration</a></li>
<li class="toctree-l2"><a class="reference internal" href="auth_indicator.html">Authentication indicators</a></li>
<li class="toctree-l2"><a class="reference internal" href="admin_commands/index.html">Administration programs</a></li>
<li class="toctree-l2"><a class="reference internal" href="../mitK5defaults.html">MIT Kerberos defaults</a></li>
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