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<td style="vertical-align: top;; padding: 0px; border-collapse: collapse; padding-right: 5px; font-size: 20px; line-height: 30px; mso-line-height-rule: exactly" class="page-title-pattern-header-container"> <span class="page-title-pattern-header" style="font-family: Arial, sans-serif; padding: 0; font-size: 20px; line-height: 30px; mso-text-raise: 2px; mso-line-height-rule: exactly; vertical-align: middle"> <a href="https://issues.shibboleth.net/jira/browse/IDP-111" style="color: #3b73af; text-decoration: none">Re: Create an authentication subflow that validates a Kerberos ticket</a> </span>
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<p style="margin: 10px 0 0 0">The following list describes the most important use cases we want to support:</p>
<p style="margin: 10px 0 0 0"><b>Login options:</b></p>
<ul>
<li>
Automatic login: If the client supports SPNEGO/Kerberos, SPNEGO/Kerberos login should be tried first. If it fails, the IdP should fall back to a different login method, e.g. username/password.
<ul>
<li>
This use case is suitable for organizations that can make sure that all clients reliably support SPNEGO/Kerberos, or that there are no Internet Explorers that might fall back to NTLM.
</li>
</ul>
</li>
<li>
Choice of login method: The user should get a single login page where the user can choose how to log in, either by username/password or by SPNEGO/Kerberos.
<ul>
<li>
This use case is suitable if it can't be made sure that all clients reliably support SPNEGO/Kerberos, or if users should be required to opt-in for SPNEGO/Kerberos.
</li>
</ul>
</li>
</ul>
<p style="margin: 10px 0 0 0"><b>Availability of SPNEGO/Kerberos login:</b></p>
<ul>
<li>
The administrator of the IdP should have the option to enable/disable the SPNEGO/Kerberos login based on certain criteria, e.g. the user agent's IP address or identifier string. For example, the administrator can make sure that SPNEGO/Kerberos is not available for user agents or clients known to not support SPNEGO/Kerberos.
</li>
<li>
The user should have the option to opt-in or opt-out for SPNEGO/Kerberos login.
</li>
</ul>
<p style="margin: 10px 0 0 0"><b>Auto-login:</b></p>
<ul>
<li>
Opt-in for auto-login: If a user needs to opt-in for SPNEGO/Kerberos, the user should have the option to enable automatic login by SPNEGO/Kerberos for future logins.
</li>
<li>
Configuration of auto-login by the user: The user should have a possibility to enable/disable auto-login through an administrative interface.
</li>
</ul>
<p style="margin: 10px 0 0 0">The following issues regarding SPNEGO need to be considered:</p>
<ul>
<li>
Not possible to determine whether SPNEGO will work: The SPNEGO protocol doesn't support a mechanism to query the client's capabilities to check whether SPNEGO/Kerberos will work.
</li>
<li>
Internet Explorer: Downgrade to NTLM: If Internet Explorer gets an initial request to initiate SPNEGO, but Kerberos is not available on the client or doesn't work, Internet Explorer falls back to NTLM and shows a login form to the user. The IdP won't get a response and can't handle this problem appropriately. This situation might occur when a road warrior using Internet Explorer tries to log in using SPNEGO/Kerberos.
</li>
</ul>
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