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#email-page { padding: 8px !important; }
#email-banner { padding: 8px 8px 0 8px !important; }
#email-avatar { margin: 1px 8px 8px 0 !important; padding: 0 !important; }
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<a class="user-hover" rel="olpe4718@su.se" id="email_olpe4718@su.se" href="https://issues.shibboleth.net/jira/secure/ViewProfile.jspa?name=olpe4718%40su.se" style="color:#326ca6;">olpe4718@su.se</a>
created <img src="https://issues.shibboleth.net/jira/images/icons/issuetypes/bug.png" height="16" width="16" border="0" align="absmiddle" alt="Bug"> <a style='color:#326ca6;text-decoration:none;' href='https://issues.shibboleth.net/jira/browse/SIDP-607'>SIDP-607</a>
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<a style='color:#326ca6;text-decoration:none;' href='https://issues.shibboleth.net/jira/browse/SIDP-607'><strong>Incorrect/misleading Kerberos authentication example in login.config</strong></a>
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<strong style="font-weight:normal;color:#505050;">Issue Type:</strong>
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<img src="https://issues.shibboleth.net/jira/images/icons/issuetypes/bug.png" height="16" width="16" border="0" align="absmiddle" alt="Bug"> Bug
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<strong style="font-weight:normal;color:#505050;">Affects Versions:</strong>
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<td style="color:#000000;font-family:Arial,FreeSans,Helvetica,sans-serif;font-size:12px;padding:0 0 10px 0;width:100%;">
2.4.0 </td>
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<strong style="font-weight:normal;color:#505050;">Assignee:</strong>
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<a class="user-hover" rel="cantor.2@osu.edu" id="email_cantor.2@osu.edu" href="https://issues.shibboleth.net/jira/secure/ViewProfile.jspa?name=cantor.2%40osu.edu" style="color:#326ca6;">Scott Cantor</a>
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<strong style="font-weight:normal;color:#505050;">Components:</strong>
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<td style="color:#000000;font-family:Arial,FreeSans,Helvetica,sans-serif;font-size:12px;padding:0 0 10px 0;width:100%;">
Authentication </td>
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<strong style="font-weight:normal;color:#505050;">Created:</strong>
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14/May/14 8:57 AM
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<strong style="font-weight:normal;color:#505050;">Description:</strong>
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<p style='margin-top:0;margin-bottom:10px;'>The <tt>conf/login.config</tt> supplied with the Shibboleth IdP contains the following example:</p>
<div class="code panel" style="border-width: 1px;"><div class="codeContent panelContent">
<pre class="code-java">
<span class="code-comment">// Example Kerberos authentication, requires Sun's JVM
</span><span class="code-comment">// See: https://wiki.shibboleth.net/confluence/display/SHIB2/IdPAuthUserPass
</span>/*
com.sun.security.auth.module.Krb5LoginModule required
useKeyTab=<span class="code-quote">"<span class="code-keyword">true</span>"</span>
keyTab=<span class="code-quote">"/path/to/idp/keytab/file"</span>;
*/
</pre>
</div></div>
<p style='margin-top:0;margin-bottom:10px;'>The example is wrong, because there is no point in supplying the keyTab option to the module. The keyTab option does not use the keytab to authenticate the KDC, it is used in place of a password when acquiring a ticket. In this case, the IdP wants to check the user's password, so there is absolutely no reason to try to authenticate using a keytab.</p>
<p style='margin-top:0;margin-bottom:10px;'>Furthermore, the example is misleading, because it suggests that Oracle's Krb5LoginModule <b>does</b> support KDC authentication/spoof-protection using a keytab, when in fact it does not.</p>
<p style='margin-top:0;margin-bottom:10px;'>I suggest that the example is changed to:</p>
<div class="code panel" style="border-width: 1px;"><div class="codeContent panelContent">
<pre class="code-java">
<span class="code-comment">// Example Kerberos authentication, requires Oracle's JVM or OpenJDK.
</span><span class="code-comment">// Warning: The module does not support verifying the KDC using a keytab.
</span><span class="code-comment">// See: https://spaces.internet2.edu/display/SHIB2/IdPAuthUserPass
</span>/*
com.sun.security.auth.module.Krb5LoginModule required;
*/
</pre>
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<strong style="font-weight:normal;color:#505050;">Project:</strong>
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<td style="color:#000000;font-family:Arial,FreeSans,Helvetica,sans-serif;font-size:12px;padding:0 0 10px 0;width:100%;">
<a style="color:#326ca6;" href="https://issues.shibboleth.net/jira/browse/SIDP">Shibboleth IdP 2 - Java</a>
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<strong style="font-weight:normal;color:#505050;">Priority:</strong>
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<td style="color:#000000;font-family:Arial,FreeSans,Helvetica,sans-serif;font-size:12px;padding:0 0 10px 0;width:100%;">
<img src="https://issues.shibboleth.net/jira/images/icons/priorities/major.png" height="16" width="16" border="0" align="absmiddle" alt="Major"> Major
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<strong style="font-weight:normal;color:#505050;">Reporter:</strong>
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<td style="color:#000000;font-family:Arial,FreeSans,Helvetica,sans-serif;font-size:12px;padding:0 0 10px 0;width:100%;">
<a class="user-hover" rel="olpe4718@su.se" id="email_olpe4718@su.se" href="https://issues.shibboleth.net/jira/secure/ViewProfile.jspa?name=olpe4718%40su.se" style="color:#326ca6;">olpe4718@su.se</a>
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