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- <section id="authentication-indicators">
-<span id="auth-indicator"></span><h1>Authentication indicators<a class="headerlink" href="#authentication-indicators" title="Link to this heading">¶</a></h1>
-<p>As of release 1.14, the KDC can be configured to annotate tickets if
-the client authenticated using a stronger preauthentication mechanism
-such as <a class="reference internal" href="pkinit.html#pkinit"><span class="std std-ref">PKINIT</span></a> or <a class="reference internal" href="otp.html#otp-preauth"><span class="std std-ref">OTP</span></a>. These
-annotations are called “authentication indicators.” Service
-principals can be configured to require particular authentication
-indicators in order to authenticate to that service. An
-authentication indicator value can be any string chosen by the KDC
-administrator; there are no pre-set values.</p>
-<p>To use authentication indicators with PKINIT or OTP, first configure
-the KDC to include an indicator when that preauthentication mechanism
-is used. For PKINIT, use the <strong>pkinit_indicator</strong> variable in
-<a class="reference internal" href="conf_files/kdc_conf.html#kdc-conf-5"><span class="std std-ref">kdc.conf</span></a>. For OTP, use the <strong>indicator</strong> variable in the
-token type definition, or specify the indicators in the <strong>otp</strong> user
-string as described in <a class="reference internal" href="otp.html#otp-preauth"><span class="std std-ref">OTP Preauthentication</span></a>.</p>
-<p>To require an indicator to be present in order to authenticate to a
-service principal, set the <strong>require_auth</strong> string attribute on the
-principal to the indicator value to be required. If you wish to allow
-one of several indicators to be accepted, you can specify multiple
-indicator values separated by spaces.</p>
-<p>For example, a realm could be configured to set the authentication
-indicator value “strong” when PKINIT is used to authenticate, using a
-setting in the <a class="reference internal" href="conf_files/kdc_conf.html#kdc-realms"><span class="std std-ref">[realms]</span></a> subsection:</p>
-<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">pkinit_indicator</span> <span class="o">=</span> <span class="n">strong</span>
-</pre></div>
-</div>
-<p>A service principal could be configured to require the “strong”
-authentication indicator value:</p>
-<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ kadmin setstr host/high.value.server require_auth strong
-Password for user/admin@KRBTEST.COM:
-</pre></div>
-</div>
-<p>A user who authenticates with PKINIT would be able to obtain a ticket
-for the service principal:</p>
-<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ kinit -X X509_user_identity=FILE:/my/cert.pem,/my/key.pem user
-$ kvno host/high.value.server
-host/high.value.server@KRBTEST.COM: kvno = 1
-</pre></div>
-</div>
-<p>but a user who authenticates with a password would not:</p>
-<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ kinit user
-Password for user@KRBTEST.COM:
-$ kvno host/high.value.server
-kvno: KDC policy rejects request while getting credentials for
- host/high.value.server@KRBTEST.COM
-</pre></div>
-</div>
-<p>GSSAPI server applications can inspect authentication indicators
-through the <a class="reference internal" href="../appdev/gssapi.html#gssapi-authind-attr"><span class="std std-ref">auth-indicators</span></a> name
-attribute.</p>
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