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<td class="page-title-pattern-first-line " style="padding: 0; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"><a href="https://shibboleth.atlassian.net/browse/IDP?atlOrigin=eyJpIjoiNDI5ZDlkNGU0Mzg4NGFmYThmMWY4ZDA4Y2NiZDcwNWMiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">Identity Provider</a> / <a href="https://shibboleth.atlassian.net/browse/IDP-2028?atlOrigin=eyJpIjoiNDI5ZDlkNGU0Mzg4NGFmYThmMWY4ZDA4Y2NiZDcwNWMiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-fb4c7971-3e54-4bef-83f2-9b89de31af31" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"></a> <a href="https://shibboleth.atlassian.net/browse/IDP-2028?atlOrigin=eyJpIjoiNDI5ZDlkNGU0Mzg4NGFmYThmMWY4ZDA4Y2NiZDcwNWMiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">IDP-2028</a></td>
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<td style="vertical-align: top;; padding: 0; 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://shibboleth.atlassian.net/browse/IDP-2028?atlOrigin=eyJpIjoiNDI5ZDlkNGU0Mzg4NGFmYThmMWY4ZDA4Y2NiZDcwNWMiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">List of CAS proxies in /proxyValidate call contains service urls instead of pgtUrl</a> </span></td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Issue Type:</th>
<td class="has-icon" style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"><img src="cid:jira-generated-image-avatar-fb4c7971-3e54-4bef-83f2-9b89de31af31" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"> Bug </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Affects Versions:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 4.2.1 </td>
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<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> CAS </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Created:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 21/Oct/22 11:07 AM </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Priority:</th>
<td class="has-icon" style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"><img src="cid:jira-generated-image-static-trivial-c9413c9b-3a94-4cbb-9186-6b0e485bfcf6" height="16" width="16" border="0" align="absmiddle" alt="Trivial" style="vertical-align: text-bottom"> Trivial </td>
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<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"><a class="user-hover" rel="632ca15b748d1bfcb85792a9" style="color:#3b73af;; color: #3b73af; text-decoration: none" id="email_632ca15b748d1bfcb85792a9" href="https://shibboleth.atlassian.net/secure/ViewProfile.jspa?accountId=632ca15b748d1bfcb85792a9"> Maxime Besson </a></td>
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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0; border-collapse: collapse; padding: 0 0 10px"><p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0; margin-top: 0">During a migration from Apereo CAS to Shib IDP 4.2.1 I noticed a change of behavior regarding the proxy feature.</p><p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">When doing a /proxyvalidate call, IDP returns the following:</p>
<div class="preformatted panel" style="border-width: 1px;; border: 1px solid #cccccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #cccccc; -moz-border-radius: 3px; border-radius: 3px; margin: 9px 0">
<div class="preformattedContent panelContent" style="padding: 9px 12px">
<pre style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal; white-space: pre; word-break: normal; word-wrap: break-word; word-break: break-all; white-space: pre-wrap"><?xml version="1.0" encoding="UTF-8"?>
<cas:serviceResponse xmlns:cas="http://www.yale.edu/tp/cas">
<cas:authenticationSuccess>
<cas:user>test</cas:user>
<cas:proxies>
<cas:proxy>https://cas.example.com/example_proxy_GET.php</cas:proxy>
</cas:proxies>
</cas:authenticationSuccess>
</cas:serviceResponse>
</pre>
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</div><p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">The <cas:proxy> field contains the service URL used when obtaining the PGT</p><p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">However, this is not in line with CAS Procotol specifications (2.6.2)</p><p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0"><a href="https://apereo.github.io/cas/development/protocol/CAS-Protocol-V2-Specification.html#262-response" title="smart-link" class="external-link" rel="nofollow noreferrer" style="color: #3b73af; text-decoration: none">https://apereo.github.io/cas/development/protocol/CAS-Protocol-V2-Specification.html#262-response</a></p><p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">V3 of the protocol makes it even clearer in 2.5.4.3</p><p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0"><a href="https://apereo.github.io/cas/6.6.x/protocol/CAS-Protocol-Specification.html#254-proxy-callback" title="smart-link" class="external-link" rel="nofollow noreferrer" style="color: #3b73af; text-decoration: none">https://apereo.github.io/cas/6.6.x/protocol/CAS-Protocol-Specification.html#254-proxy-callback</a></p>
<blockquote style="margin: 10px 0 0; border-left: 1px solid #cccccc; color: #707070; margin-left: 19px; padding: 10px 20px">
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0; margin-top: 0">However, the identifying callback URL provided upon validation in the <tt><proxy></tt> block MUST be the same URL that was initially passed to <tt>/serviceValidate</tt> (or <tt>/proxyValidate</tt>) as the <tt>pgtUrl</tt> parameter.</p>
</blockquote><p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">In some CAS libraries, the service and pgtUrl are the same (phpCAS), but not in all applications: the SOGo groupware, for instance, uses a dedicated URL for PGT transmission, in which case, Apereo CAS and Shibboleth IDP have different behaviors.</p><p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">This can cause issues on applications that do strict checking on <cas:proxy> URLs</p></td>
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