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</head>
<body id="sso" class="article toc2 toc-left">
<div id="header">
<h1>Single Sign On</h1>
<div id="toc" class="toc2">
<div id="toctitle">Table of Contents</div>
<ul class="sectlevel1">
<li><a href="#sso-server">Server Requirements</a></li>
<li><a href="#sso-client">Client Requirements</a></li>
</ul>
</div>
</div>
<div id="content">
<div id="preamble">
<div class="sectionbody">
<div class="paragraph">
<p>Cockpit can use Kerberos for Single Sign On authentication, where users
are automatically authenticated if they have a valid Kerberos ticket.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="sso-server">Server Requirements</h2>
<div class="sectionbody">
<div class="paragraph">
<p>To authenticate users, the server that Cockpit is running on must be
joined to a domain. This can usually be accomplished using the
<a href="https://freedesktop.org/software/realmd/docs/realm.html"><code>realm join example.com</code></a>
command.</p>
</div>
<div class="paragraph">
<p>The domain must be resolvable by DNS. For instance, the SRV records of
the kerberos server should be resolvable:</p>
</div>
<div class="literalblock">
<div class="content">
<pre>$ host -t SRV _kerberos._udp.example.com
_kerberos._udp.example.com has SRV record 0 100 88 dc.example.com</pre>
</div>
</div>
<div class="paragraph">
<p>The server running Cockpit should have a fully qualified name that ends
with the domain name.</p>
</div>
<div class="paragraph">
<p>There must be a valid Kerberos host key for the server in the
<code>/etc/krb5.keytab</code> file. Alternatively, if you would like to use a
different keytab, you can do so by placing it in
<code>/etc/cockpit/krb5.keytab</code>, or below <code>$XDG_CONFIG_DIRS</code> if set (see
<a href="./cockpit.conf.5.html">cockpit.conf</a>). It may be necessary to create
a kerberos service principal and update the keytab if it is not present.
Depending on your domain type different service names are required:</p>
</div>
<div class="dlist">
<dl>
<dt class="hdlist1">Active Directory</dt>
<dd>
<p><code>HOST/server.example.com@EXAMPLE.COM</code></p>
</dd>
<dt class="hdlist1">IPA and MIT</dt>
<dd>
<p><code>HTTP/server.example.com@EXAMPLE.COM</code></p>
</dd>
</dl>
</div>
<div class="paragraph">
<p>When joining an IPA domain with Cockpit and the <code>ipa</code> command line
tool is available, both the service principal name and a
<code>/etc/cockpit/krb5.keytab</code> get created automatically, so that Kerberos
based single sign on into Cockpit works out of the box. If you want/need
to do this by hand or in a script, first create or modify the <code>HTTP/</code>
service principal:</p>
</div>
<div class="literalblock">
<div class="content">
<pre>$ sudo ipa service-add --ok-as-delegate=true --ok-to-auth-as-delegate=true \
HTTP/server.example.com@EXAMPLE.COM
# or, if it already exists, just enable delegation:
$ sudo ipa service-mod --ok-as-delegate=true --ok-to-auth-as-delegate=true \
HTTP/server.example.com@EXAMPLE.COM</pre>
</div>
</div>
<div class="paragraph">
<p>Then generate a key for that principal:</p>
</div>
<div class="literalblock">
<div class="content">
<pre>$ sudo ipa-getkeytab -p HTTP/server.example.com@EXAMPLE.COM -k /etc/cockpit/krb5.keytab</pre>
</div>
</div>
<div class="paragraph">
<p>The following command can be used to list the
<code>/etc/cockpit/krb5.keytab</code>:</p>
</div>
<div class="literalblock">
<div class="content">
<pre>$ sudo klist -k /etc/cockpit/krb5.keytab</pre>
</div>
</div>
<div class="paragraph">
<p>Lastly accounts from the domain must be resolvable to unix accounts on
the server running Cockpit. For example:</p>
</div>
<div class="literalblock">
<div class="content">
<pre>$ getent passwd user@example.com
user@example.com:*:381001109:381000513:User Name:/home/user:/bin/sh</pre>
</div>
</div>
<div class="paragraph">
<p>If you wish to delegate your kerberos credentials to Cockpit, and allow
Cockpit to then connect to other machines using those credentials, you
should enable delegation for the hosts running Cockpit, and in some
cases the <code>HTTP</code> service as well. When joining an IPA domain, this is
enabled by default.</p>
</div>
<div class="paragraph">
<p>Domain admins (usually the <code>admins@example.com</code> group) should normally
also be able to administer any joined machine. Enable sudo access for
that group with the following command on the IPA server, for version
4.7.1 and later:</p>
</div>
<div class="literalblock">
<div class="content">
<pre>ipa-advise enable-admins-sudo | sh -ex</pre>
</div>
</div>
<div class="paragraph">
<p>On earlier FreeIPA versions, run these commands instead, as a domain
admin on any joined machine:</p>
</div>
<div class="literalblock">
<div class="content">
<pre>ipa sudorule-add --hostcat=all --cmdcat=all All
ipa sudorule-add-user --groups=admins All</pre>
</div>
</div>
<div class="paragraph">
<p>Note that this does not change security properties; domain admins can
give this privilege to themselves, so it is safe to enable by default.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="sso-client">Client Requirements</h2>
<div class="sectionbody">
<div class="paragraph">
<p>The client side, where your web browser is running, should have a valid
kerberos ticket in the current user session. A command like this will
get one:</p>
</div>
<div class="literalblock">
<div class="content">
<pre>$ kinit user@EXAMPLE.COM
Password for user@EXAMPLE.COM:</pre>
</div>
</div>
<div class="paragraph">
<p>In addition your browser must be usually be configured to allow kerberos
authentication for the domain.</p>
</div>
<div class="dlist">
<dl>
<dt class="hdlist1">Mozilla Firefox</dt>
<dd>
<p>Go to <code>about:config</code> and set the
<code>network.negotiate-auth.trusted-uris</code> setting to your domain name
preceded by a dot, ie: <code>.example.com</code></p>
</dd>
<dt class="hdlist1">Google Chrome</dt>
<dd>
<p>On Linux: create the file
<code>/etc/opt/chrome/policies/managed/example-com.json</code> with the
contents:</p>
</dd>
<dt class="hdlist1"></dt>
</dl>
</div>
<div class="literalblock">
<div class="content">
<pre>{
"AuthServerWhitelist": "*example.com"
}</pre>
</div>
</div>
<div class="dlist">
<dl>
<dt class="hdlist1"></dt>
<dd>
<p>and restart the browser. On other platforms, exit your browser
completely, and start it with a command line like this:
<code>google-chrome --auth-server-whitelist=*example.com</code></p>
</dd>
</dl>
</div>
<div class="paragraph">
<p>Use a fully qualified server name (with the domain name at the end) to
access Cockpit in your web browser.</p>
</div>
<div class="paragraph">
<p>If you wish to connect from one server to another in Cockpit using
kerberos SSO, then you have to explicitly enable all sorts of things.
For starters, make sure that delegated credentials are allowed by your
domain (see above). Next when requesting your kerberos ticket make sure
that forwardable tickets are requested:</p>
</div>
<div class="literalblock">
<div class="content">
<pre>$ kinit -f user@EXAMPLE.COM
Password for user@EXAMPLE.COM:</pre>
</div>
</div>
<div class="paragraph">
<p>Make sure that the forwardable flag <code>F</code> is present in your ticket:</p>
</div>
<div class="literalblock">
<div class="content">
<pre>$ klist -f
Ticket cache: KEYRING:persistent:1000:1000
Default principal: user@EXAMPLE.COM
Valid starting Expires Service principal
18.03.2017 05:39:23 19.03.2017 05:39:20 krbtgt/EXAMPLE.COM@EXAMPLE.COM
Flags: FIA</pre>
</div>
</div>
<div class="paragraph">
<p>Lastly configure your browser to allow delegated, forwardable kerberos
credentials to be sent to Cockpit:</p>
</div>
<div class="dlist">
<dl>
<dt class="hdlist1">Mozilla Firefox</dt>
<dd>
<p>Go to <code>about:config</code> and set the
<code>network.negotiate-auth.delegation-uris</code> setting to your domain name
preceded by a dot, ie: <code>.example.com</code></p>
</dd>
<dt class="hdlist1">Google Chrome</dt>
<dd>
<p>On Linux: create the file
<code>/etc/opt/chrome/policies/managed/example-com.json</code> with the
contents:</p>
</dd>
<dt class="hdlist1"></dt>
</dl>
</div>
<div class="literalblock">
<div class="content">
<pre>{
"AuthServerWhitelist": "*example.com",
"AuthNegotiateDelegateWhitelist": "*example.com"
}</pre>
</div>
</div>
<div class="dlist">
<dl>
<dt class="hdlist1"></dt>
<dd>
<p>and restart the browser. On other platforms, exit your browser
completely, and start it with a command line like this:
<code>google-chrome --auth-server-whitelist=*example.com --auth-negotiate-delegate-whitelist=*example.com</code></p>
</dd>
</dl>
</div>
</div>
</div>
</div>
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<div id="footer-text">
Last updated 2026-01-28 11:12:25 UTC
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