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/* Changing the layout to use less space for mobiles */
@media screen and (max-device-width: 480px), screen and (-webkit-min-device-pixel-ratio: 2) {
    #email-body { min-width: 30em !important; }
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    #email-banner { padding: 8px 8px 0 8px !important; }
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}
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                                        <img id="email-avatar" src="https://issues.shibboleth.net/jira/secure/useravatar?ownerId=serac%40vt.edu&avatarId=10882" alt="" height="48" width="48" border="0" align="left" style="padding:0;margin: 0 16px 16px 0;" />
                        <div id="email-action" style="padding: 0 0 8px 0;font-size:12px;line-height:18px;">
                                    <a class="user-hover" rel="serac@vt.edu" id="email_serac@vt.edu" href="https://issues.shibboleth.net/jira/secure/ViewProfile.jspa?name=serac%40vt.edu" style="color:#326ca6;">Marvin S Addison</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/IDP-643'>IDP-643</a>
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                <a style='color:#326ca6;text-decoration:none;' href='https://issues.shibboleth.net/jira/browse/IDP-643'><strong>Impossible to Configure CAS Proxy Trust</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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                    3.1.0,                     3.0.0            </td>
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        <strong style="font-weight:normal;color:#505050;">Assignee:</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="serac@vt.edu" id="email_serac@vt.edu" href="https://issues.shibboleth.net/jira/secure/ViewProfile.jspa?name=serac%40vt.edu" style="color:#326ca6;">Marvin S Addison</a>
                </td>
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        <strong style="font-weight:normal;color:#505050;">Components:</strong>
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                    CAS            </td>
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        <strong style="font-weight:normal;color:#505050;">Created:</strong>
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        13/Mar/15 4:30 PM
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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;'>It looks like r4186 broke CAS proxy trust configuration back in December, and I just noticed today trying to configure this for our environment. Now I get the following error:</p>

<div class="code panel" style="border-width: 1px;"><div class="codeContent panelContent">
<pre class="code-java">
2015-03-13 15:51:14,154 - DEBUG [net.shibboleth.idp.cas.proxy.HttpClientProxyAuthenticator$TrustEngineTrustStrategy:83] - Validating cert C=US, DC=edu, DC=vt, ST=Virginia, L=Blacksburg, O=Virginia Polytechnic Institute and State University, OU=Middleware, CN=cas-sp.middleware.vt.edu issued by C=US, O=Virginia Tech, OU=Global Server CA, CN=Virginia Tech Global Server CA
2015-03-13 15:51:14,154 - DEBUG [org.opensaml.security.x509.impl.PKIXX509CredentialTrustEngine:122] - Attempting PKIX validation of untrusted credential
2015-03-13 15:51:14,155 - DEBUG [org.opensaml.security.x509.impl.PKIXX509CredentialTrustEngine:169] - Beginning PKIX validation using trusted validation information
2015-03-13 15:51:14,155 - DEBUG [org.opensaml.security.x509.impl.BasicX509CredentialNameEvaluator:247] - Supplied trusted names are <span class="code-keyword">null</span> or empty, failing name evaluation
2015-03-13 15:51:14,155 - DEBUG [org.opensaml.security.x509.impl.PKIXX509CredentialTrustEngine:172] - Evaluation of credential against trusted names failed. Aborting PKIX validation
2015-03-13 15:51:14,178 - INFO [net.shibboleth.idp.cas.flow.ValidateProxyCallbackAction:142] - Proxy authentication failed <span class="code-keyword">for</span> https:<span class="code-comment">//cas-sp.middleware.vt.edu:7443/secure/proxyReceptor: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target</span>
</pre>
</div></div>

<p style='margin-top:0;margin-bottom:10px;'>Prior to r4186, it was permissible to provide an empty set of trusted names. Now a null or empty set returns false, producing the error above.</p>

<p style='margin-top:0;margin-bottom:10px;'>It appears a CAS-specific PKIXValidationInformationResolver is needed that pulls trusted names from certificate metadata in order to populate the list of trusted names to pass into BasicX509CredentialNameEvaluator.</p>
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        <strong style="font-weight:normal;color:#505050;">Fix 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%;">
                    3.1.1            </td>
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    <td style="color:#000000;font-family:Arial,FreeSans,Helvetica,sans-serif;font-size:12px;padding:0 10px 10px 0;white-space:nowrap;">
        <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/IDP">Identity Provider</a>
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        <strong style="font-weight:normal;color:#505050;">Priority:</strong>
    </td>
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                        <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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    <td style="color:#000000;font-family:Arial,FreeSans,Helvetica,sans-serif;font-size:12px;padding:0 10px 10px 0;white-space:nowrap;">
        <strong style="font-weight:normal;color:#505050;">Reporter:</strong>
    </td>
    <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="serac@vt.edu" id="email_serac@vt.edu" href="https://issues.shibboleth.net/jira/secure/ViewProfile.jspa?name=serac%40vt.edu" style="color:#326ca6;">Marvin S Addison</a>
                </td>
</tr>                                                        <tr valign="top">
        <td style="color:#000000;font-family:Arial,FreeSans,Helvetica,sans-serif;font-size:12px;padding:0 10px 10px 0;white-space:nowrap;">
            <strong style="font-weight:normal;color:#505050;">Original Estimate:</strong>
        </td>
        <td style="color:#000000;font-family:Arial,FreeSans,Helvetica,sans-serif;font-size:12px;padding:0 0 10px 0;width:100%;">
            2 days
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            <strong style="font-weight:normal;color:#505050;">Remaining Estimate:</strong>
        </td>
        <td style="color:#000000;font-family:Arial,FreeSans,Helvetica,sans-serif;font-size:12px;padding:0 0 10px 0;width:100%;">
            2 days
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