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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/JDUO-47" style="color: #3b73af; text-decoration: none">Re: No Duo Context in shibboleth.authn.DuoOIDC.ContextToPrincipalMappingStrategy?</a> </span> </td>
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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0px; border-collapse: collapse; padding: 0 0 10px 0"> <p style="margin: 10px 0 0 0; margin-top: 0">Hi Sean,</p> <p style="margin: 10px 0 0 0">Good question, the answer is subtle (and interesting, and deeper than my understanding). In short, I would say it has a possibly small (tiny) effect on efficiency and none on security. You're fine to use in production, it is just a bit messy config-wise.</p> <p style="margin: 10px 0 0 0">In more detail. The cleanup hook removes the Duo context reference from the parent context as soon as the context is no longer required. This should (unless other references to it exist) free it for garbage collection (free some memory please) sooner than if we wait until the parent request context is no longer required - eventually, however, the browser to IdP conversation ends and the whole set of contexts will be marked for garbage collection/removal anyway. So 'letting' the reference go early could be seen as 'better' for overall application efficiency. </p> <p style="margin: 10px 0 0 0">However, there are no guarantees from either the implementation or from the JVMs garbage collection process (although there are different types and its complexities are beyond my understanding) that things are 'securely blanked' e.g. zeroed or immediately overwritten. Therefore we do not really know how long the actual data in the context will be observable in memory. In any event, some of the sensitive Duo Integration properties e.g. client secret, persist in memory longer than the contexts in order for it to work. They also persist on disk of course, and if you have access to dump the JVM memory you likely have access to the server and the sensitive information in the Duo context anyway (from the properties file).</p> <p style="margin: 10px 0 0 0">Hopefully, that explanation is of some use.</p> </td>
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