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<h1><a href="../../index.html">MIT Kerberos Documentation</a></h1>
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<div class="section" id="k5login">
<span id="k5login-5"></span><h1>.k5login<a class="headerlink" href="#k5login" title="Permalink to this headline">¶</a></h1>
<div class="section" id="description">
<h2>DESCRIPTION<a class="headerlink" href="#description" title="Permalink to this headline">¶</a></h2>
<p>The .k5login file, which resides in a user’s home directory, contains
a list of the Kerberos principals. Anyone with valid tickets for a
principal in the file is allowed host access with the UID of the user
in whose home directory the file resides. One common use is to place
a .k5login file in root’s home directory, thereby granting system
administrators remote root access to the host via Kerberos.</p>
</div>
<div class="section" id="examples">
<h2>EXAMPLES<a class="headerlink" href="#examples" title="Permalink to this headline">¶</a></h2>
<p>Suppose the user <code class="docutils literal notranslate"><span class="pre">alice</span></code> had a .k5login file in her home directory
containing just the following line:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">bob</span><span class="nd">@FOOBAR</span><span class="o">.</span><span class="n">ORG</span>
</pre></div>
</div>
<p>This would allow <code class="docutils literal notranslate"><span class="pre">bob</span></code> to use Kerberos network applications, such as
ssh(1), to access <code class="docutils literal notranslate"><span class="pre">alice</span></code>’s account, using <code class="docutils literal notranslate"><span class="pre">bob</span></code>’s Kerberos
tickets. In a default configuration (with <strong>k5login_authoritative</strong> set
to true in <a class="reference internal" href="../../admin/conf_files/krb5_conf.html#krb5-conf-5"><span class="std std-ref">krb5.conf</span></a>), this .k5login file would not let
<code class="docutils literal notranslate"><span class="pre">alice</span></code> use those network applications to access her account, since
she is not listed! With no .k5login file, or with <strong>k5login_authoritative</strong>
set to false, a default rule would permit the principal <code class="docutils literal notranslate"><span class="pre">alice</span></code> in the
machine’s default realm to access the <code class="docutils literal notranslate"><span class="pre">alice</span></code> account.</p>
<p>Let us further suppose that <code class="docutils literal notranslate"><span class="pre">alice</span></code> is a system administrator.
Alice and the other system administrators would have their principals
in root’s .k5login file on each host:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">alice</span><span class="nd">@BLEEP</span><span class="o">.</span><span class="n">COM</span>
<span class="n">joeadmin</span><span class="o">/</span><span class="n">root</span><span class="nd">@BLEEP</span><span class="o">.</span><span class="n">COM</span>
</pre></div>
</div>
<p>This would allow either system administrator to log in to these hosts
using their Kerberos tickets instead of having to type the root
password. Note that because <code class="docutils literal notranslate"><span class="pre">bob</span></code> retains the Kerberos tickets for
his own principal, <code class="docutils literal notranslate"><span class="pre">bob@FOOBAR.ORG</span></code>, he would not have any of the
privileges that require <code class="docutils literal notranslate"><span class="pre">alice</span></code>’s tickets, such as root access to
any of the site’s hosts, or the ability to change <code class="docutils literal notranslate"><span class="pre">alice</span></code>’s
password.</p>
</div>
<div class="section" id="see-also">
<h2>SEE ALSO<a class="headerlink" href="#see-also" title="Permalink to this headline">¶</a></h2>
<p>kerberos(1)</p>
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<div class="sidebar">
<h2>On this page</h2>
<ul>
<li><a class="reference internal" href="#">.k5login</a><ul>
<li><a class="reference internal" href="#description">DESCRIPTION</a></li>
<li><a class="reference internal" href="#examples">EXAMPLES</a></li>
<li><a class="reference internal" href="#see-also">SEE ALSO</a></li>
</ul>
</li>
</ul>
<br/>
<h2>Table of contents</h2>
<ul class="current">
<li class="toctree-l1 current"><a class="reference internal" href="../index.html">For users</a><ul class="current">
<li class="toctree-l2"><a class="reference internal" href="../pwd_mgmt.html">Password management</a></li>
<li class="toctree-l2"><a class="reference internal" href="../tkt_mgmt.html">Ticket management</a></li>
<li class="toctree-l2 current"><a class="reference internal" href="index.html">User config files</a><ul class="current">
<li class="toctree-l3"><a class="reference internal" href="kerberos.html">kerberos</a></li>
<li class="toctree-l3 current"><a class="current reference internal" href="#">.k5login</a></li>
<li class="toctree-l3"><a class="reference internal" href="k5identity.html">.k5identity</a></li>
</ul>
</li>
<li class="toctree-l2"><a class="reference internal" href="../user_commands/index.html">User commands</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="../../admin/index.html">For administrators</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../appdev/index.html">For application developers</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../plugindev/index.html">For plugin module developers</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../build/index.html">Building Kerberos V5</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../basic/index.html">Kerberos V5 concepts</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../formats/index.html">Protocols and file formats</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../mitK5features.html">MIT Kerberos features</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../build_this.html">How to build this documentation from the source</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../about.html">Contributing to the MIT Kerberos Documentation</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../resources.html">Resources</a></li>
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