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<td class="page-title-pattern-first-line " style="padding: 0px; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"> <a href="https://issues.shibboleth.net/jira/browse/IDP" style="color: #3b73af; text-decoration: none">Identity Provider</a> / <a href="https://issues.shibboleth.net/jira/browse/IDP-1033" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-fb45f7ae-cc3d-4373-ad08-6a79b8157e7a" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom" /></a> <a href="https://issues.shibboleth.net/jira/browse/IDP-1033" style="color: #3b73af; text-decoration: none">IDP-1033</a>
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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-1033" style="color: #3b73af; text-decoration: none">Logout flow views still susceptible to NullPointerException in Request.getContextPath</a> </span>
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Issue Type:
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Affects Versions:
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3.2.1
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<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="tzeller@shibboleth.net" id="email_tzeller@shibboleth.net" href="https://issues.shibboleth.net/jira/secure/ViewProfile.jspa?name=tzeller%40shibboleth.net" style="color:#3b73af;; color: #3b73af; text-decoration: none">Tom Zeller</a>
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Components:
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Logout, Spring Web Flow
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Created:
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12/Sep/16 8:18 PM
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Reporter:
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<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="tuakiriadmin-vmencl@virtualhome.tuakiri.ac.nz" id="email_tuakiriadmin-vmencl@virtualhome.tuakiri.ac.nz" href="https://issues.shibboleth.net/jira/secure/ViewProfile.jspa?name=tuakiriadmin-vmencl%40virtualhome.tuakiri.ac.nz" style="color:#3b73af;; color: #3b73af; text-decoration: none">Vladimir Mencl</a>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">This is a follow-up to <a href="https://issues.shibboleth.net/jira/browse/IDP-892" title="global logout view - Uncaught Exception on Tomcat 7" class="issue-link" data-issue-key="IDP-892" style="color: #3b73af; text-decoration: none"></a></p>
<del>
IDP-892
</del> and <a href="https://issues.shibboleth.net/jira/browse/IDP-956" title="logout.vm Does Not Correctly Render $request Variable" class="issue-link" data-issue-key="IDP-956" style="color: #3b73af; text-decoration: none"></a>
<del>
IDP-956
</del>.
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">In these issues, it was correctly identified that the NPE is caused by a stale HTTP request object.</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">The reference to the httpRequest object should be stored in an <tt><on-render></tt> section - this guarantees the reference would point to the current httpRequest object on each render. The issue reported in <a href="https://issues.shibboleth.net/jira/browse/IDP-892" title="global logout view - Uncaught Exception on Tomcat 7" class="issue-link" data-issue-key="IDP-892" style="color: #3b73af; text-decoration: none"></a></p>
<del>
IDP-892
</del> and <a href="https://issues.shibboleth.net/jira/browse/IDP-956" title="logout.vm Does Not Correctly Render $request Variable" class="issue-link" data-issue-key="IDP-956" style="color: #3b73af; text-decoration: none"></a>
<del>
IDP-956
</del> was tracked down to storing the reference in an <tt><on-entry></tt> section - this makes subsequent renders of the page use a stale reference to the HTTP request object from the previous requests.
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Comments in <a href="https://issues.shibboleth.net/jira/browse/IDP-956" title="logout.vm Does Not Correctly Render $request Variable" class="issue-link" data-issue-key="IDP-956" style="color: #3b73af; text-decoration: none"></a></p>
<del>
IDP-956
</del> included a plan to review all flows and replace on-entry with on-render where needed, but this has never happened.
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">I have just checked and I could see other parts of the logout flow that still use an <tt><on-entry></tt> - and when testing, if I reloaded the end-state page, I would again get the NullPointerException. What I did was not normal usage ... but displaying exceptions to users makes the code look bad, plus it could actually break in legitimate cases.</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Doing an audit of the webflow code with:</p>
<div class="preformatted panel" style="border-width: 1px;; border: 1px solid #ccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #ccc; -moz-border-radius: 3px 3px 3px 3px; border-radius: 3px 3px 3px 3px; margin: 9px 0">
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<pre style="margin: 10px 0 0 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-word; white-space: pre-wrap">grep -r -C 10 getNativeRequest system/flows
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">and scanning the output for lines that set <tt>requestScope.request</tt> in an <tt><on-entry></tt> section, I could see identify the following flows:</p>
<ul>
<li>
system/flows/admin/admin-abstract-flow.xml
</li>
<li>
system/flows/admin/resolvertest-flow.xml
</li>
<li>
system/flows/admin/status-flow.xml
</li>
<li>
system/flows/cas/cas-abstract-flow.xml
</li>
<li>
system/flows/logout/logout-flow.xml (other parts not fixed in <a href="https://issues.shibboleth.net/jira/browse/IDP-956" title="logout.vm Does Not Correctly Render $request Variable" class="issue-link" data-issue-key="IDP-956" style="color: #3b73af; text-decoration: none"></a>
<del>
IDP-956
</del>)
</li>
<li>
system/flows/saml/saml-abstract-flow.xml
</li>
<li>
system/flows/saml/saml2/slo-front-abstract-flow.xml (AsyncLogoutView, LogoutResponseView)
</li>
</ul>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">I am not sure whether all of the other expressions executed in the <tt><on-entry></tt> states can be re-executed in an <tt><on-render></tt> state with the same effect - for example, <tt>WriteAuditLog</tt> would this way get executed multiple times. So I'm expecting this would not be a simple rename, but that in some cases, the sections would have to be split into two parts: part goes into a new <tt><on-render></tt> section and part stays in the existing <tt><on-entry></tt> section.</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Hope this helps!</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Cheers,<br /> Vlad</p>
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