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<div class="section" id="kadm5-acl">
<span id="kadm5-acl-5"></span><h1>kadm5.acl<a class="headerlink" href="#kadm5-acl" 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 Kerberos <a class="reference internal" href="../admin_commands/kadmind.html#kadmind-8"><em>kadmind</em></a> daemon uses an Access Control List
(ACL) file to manage access rights to the Kerberos database.
For operations that affect principals, the ACL file also controls
which principals can operate on which other principals.</p>
<p>The default location of the Kerberos ACL file is
<a class="reference internal" href="../../mitK5defaults.html#paths"><em>LOCALSTATEDIR</em></a><tt class="docutils literal"><span class="pre">/krb5kdc</span></tt><tt class="docutils literal"><span class="pre">/kadm5.acl</span></tt> unless this is overridden by the <em>acl_file</em>
variable in <a class="reference internal" href="kdc_conf.html#kdc-conf-5"><em>kdc.conf</em></a>.</p>
</div>
<div class="section" id="syntax">
<h2>SYNTAX<a class="headerlink" href="#syntax" title="Permalink to this headline">¶</a></h2>
<p>Empty lines and lines starting with the sharp sign (<tt class="docutils literal"><span class="pre">#</span></tt>) are
ignored. Lines containing ACL entries have the format:</p>
<div class="highlight-python"><div class="highlight"><pre>principal permissions [target_principal [restrictions] ]
</pre></div>
</div>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">Line order in the ACL file is important. The first matching entry
will control access for an actor principal on a target principal.</p>
</div>
<dl class="docutils">
<dt><em>principal</em></dt>
<dd><p class="first">(Partially or fully qualified Kerberos principal name.) Specifies
the principal whose permissions are to be set.</p>
<p class="last">Each component of the name may be wildcarded using the <tt class="docutils literal"><span class="pre">*</span></tt>
character.</p>
</dd>
<dt><em>permissions</em></dt>
<dd><p class="first">Specifies what operations may or may not be performed by a
<em>principal</em> matching a particular entry. This is a string of one or
more of the following list of characters or their upper-case
counterparts. If the character is <em>upper-case</em>, then the operation
is disallowed. If the character is <em>lower-case</em>, then the operation
is permitted.</p>
<table border="1" class="last docutils">
<colgroup>
<col width="2%" />
<col width="98%" />
</colgroup>
<tbody valign="top">
<tr class="row-odd"><td>a</td>
<td>[Dis]allows the addition of principals or policies</td>
</tr>
<tr class="row-even"><td>c</td>
<td>[Dis]allows the changing of passwords for principals</td>
</tr>
<tr class="row-odd"><td>d</td>
<td>[Dis]allows the deletion of principals or policies</td>
</tr>
<tr class="row-even"><td>e</td>
<td>[Dis]allows the extraction of principal keys</td>
</tr>
<tr class="row-odd"><td>i</td>
<td>[Dis]allows inquiries about principals or policies</td>
</tr>
<tr class="row-even"><td>l</td>
<td>[Dis]allows the listing of all principals or policies</td>
</tr>
<tr class="row-odd"><td>m</td>
<td>[Dis]allows the modification of principals or policies</td>
</tr>
<tr class="row-even"><td>p</td>
<td>[Dis]allows the propagation of the principal database (used in <a class="reference internal" href="../database.html#incr-db-prop"><em>Incremental database propagation</em></a>)</td>
</tr>
<tr class="row-odd"><td>s</td>
<td>[Dis]allows the explicit setting of the key for a principal</td>
</tr>
<tr class="row-even"><td>x</td>
<td>Short for admcilsp. All privileges (except <tt class="docutils literal"><span class="pre">e</span></tt>)</td>
</tr>
<tr class="row-odd"><td>*</td>
<td>Same as x.</td>
</tr>
</tbody>
</table>
</dd>
</dl>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">The <tt class="docutils literal"><span class="pre">extract</span></tt> privilege is not included in the wildcard
privilege; it must be explicitly assigned. This privilege
allows the user to extract keys from the database, and must be
handled with great care to avoid disclosure of important keys
like those of the kadmin/* or krbtgt/* principals. The
<strong>lockdown_keys</strong> principal attribute can be used to prevent
key extraction from specific principals regardless of the
granted privilege.</p>
</div>
<dl class="docutils">
<dt><em>target_principal</em></dt>
<dd><p class="first">(Optional. Partially or fully qualified Kerberos principal name.)
Specifies the principal on which <em>permissions</em> may be applied.
Each component of the name may be wildcarded using the <tt class="docutils literal"><span class="pre">*</span></tt>
character.</p>
<p class="last"><em>target_principal</em> can also include back-references to <em>principal</em>,
in which <tt class="docutils literal"><span class="pre">*number</span></tt> matches the corresponding wildcard in
<em>principal</em>.</p>
</dd>
<dt><em>restrictions</em></dt>
<dd><p class="first">(Optional) A string of flags. Allowed restrictions are:</p>
<blockquote>
<div><dl class="docutils">
<dt>{+|-}<em>flagname</em></dt>
<dd>flag is forced to the indicated value. The permissible flags
are the same as those for the <strong>default_principal_flags</strong>
variable in <a class="reference internal" href="kdc_conf.html#kdc-conf-5"><em>kdc.conf</em></a>.</dd>
<dt><em>-clearpolicy</em></dt>
<dd>policy is forced to be empty.</dd>
<dt><em>-policy pol</em></dt>
<dd>policy is forced to be <em>pol</em>.</dd>
<dt>-{<em>expire, pwexpire, maxlife, maxrenewlife</em>} <em>time</em></dt>
<dd>(<a class="reference internal" href="../../basic/date_format.html#getdate"><em>getdate time</em></a> string) associated value will be forced to
MIN(<em>time</em>, requested value).</dd>
</dl>
</div></blockquote>
<p class="last">The above flags act as restrictions on any add or modify operation
which is allowed due to that ACL line.</p>
</dd>
</dl>
<div class="admonition warning">
<p class="first admonition-title">Warning</p>
<p class="last">If the kadmind ACL file is modified, the kadmind daemon needs to be
restarted for changes to take effect.</p>
</div>
</div>
<div class="section" id="example">
<h2>EXAMPLE<a class="headerlink" href="#example" title="Permalink to this headline">¶</a></h2>
<p>Here is an example of a kadm5.acl file:</p>
<div class="highlight-python"><div class="highlight"><pre>*/admin@ATHENA.MIT.EDU * # line 1
joeadmin@ATHENA.MIT.EDU ADMCIL # line 2
joeadmin/*@ATHENA.MIT.EDU i */root@ATHENA.MIT.EDU # line 3
*/root@ATHENA.MIT.EDU ci *1@ATHENA.MIT.EDU # line 4
*/root@ATHENA.MIT.EDU l * # line 5
sms@ATHENA.MIT.EDU x * -maxlife 9h -postdateable # line 6
</pre></div>
</div>
<p>(line 1) Any principal in the <tt class="docutils literal"><span class="pre">ATHENA.MIT.EDU</span></tt> realm with
an <tt class="docutils literal"><span class="pre">admin</span></tt> instance has all administrative privileges.</p>
<p>(lines 1-3) The user <tt class="docutils literal"><span class="pre">joeadmin</span></tt> has all permissions with his
<tt class="docutils literal"><span class="pre">admin</span></tt> instance, <tt class="docutils literal"><span class="pre">joeadmin/admin@ATHENA.MIT.EDU</span></tt> (matches line
1). He has no permissions at all with his null instance,
<tt class="docutils literal"><span class="pre">joeadmin@ATHENA.MIT.EDU</span></tt> (matches line 2). His <tt class="docutils literal"><span class="pre">root</span></tt> and other
non-<tt class="docutils literal"><span class="pre">admin</span></tt>, non-null instances (e.g., <tt class="docutils literal"><span class="pre">extra</span></tt> or <tt class="docutils literal"><span class="pre">dbadmin</span></tt>) have
inquire permissions with any principal that has the instance <tt class="docutils literal"><span class="pre">root</span></tt>
(matches line 3).</p>
<p>(line 4) Any <tt class="docutils literal"><span class="pre">root</span></tt> principal in <tt class="docutils literal"><span class="pre">ATHENA.MIT.EDU</span></tt> can inquire
or change the password of their null instance, but not any other
null instance. (Here, <tt class="docutils literal"><span class="pre">*1</span></tt> denotes a back-reference to the
component matching the first wildcard in the actor principal.)</p>
<p>(line 5) Any <tt class="docutils literal"><span class="pre">root</span></tt> principal in <tt class="docutils literal"><span class="pre">ATHENA.MIT.EDU</span></tt> can generate
the list of principals in the database, and the list of policies
in the database. This line is separate from line 4, because list
permission can only be granted globally, not to specific target
principals.</p>
<p>(line 6) Finally, the Service Management System principal
<tt class="docutils literal"><span class="pre">sms@ATHENA.MIT.EDU</span></tt> has all permissions, but any principal that it
creates or modifies will not be able to get postdateable tickets or
tickets with a life of longer than 9 hours.</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><a class="reference internal" href="kdc_conf.html#kdc-conf-5"><em>kdc.conf</em></a>, <a class="reference internal" href="../admin_commands/kadmind.html#kadmind-8"><em>kadmind</em></a></p>
</div>
</div>
</div>
</div>
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<h2>On this page</h2>
<ul>
<li><a class="reference internal" href="#">kadm5.acl</a><ul>
<li><a class="reference internal" href="#description">DESCRIPTION</a></li>
<li><a class="reference internal" href="#syntax">SYNTAX</a></li>
<li><a class="reference internal" href="#example">EXAMPLE</a></li>
<li><a class="reference internal" href="#see-also">SEE ALSO</a></li>
</ul>
</li>
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<li class="toctree-l3"><a class="reference internal" href="kdc_conf.html">kdc.conf</a></li>
<li class="toctree-l3 current"><a class="current reference internal" href="">kadm5.acl</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../realm_config.html">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="../lockout.html">Account lockout</a></li>
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<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>
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<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>
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<li class="toctree-l1"><a class="reference internal" href="../../about.html">Contributing to the MIT Kerberos Documentation</a></li>
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