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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/SSPCPP" style="color: #3b73af; text-decoration: none">Shibboleth SP - C++</a> / <a href="https://issues.shibboleth.net/jira/browse/SSPCPP-668" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-static-bug-7766c147-f246-46da-8426-0fd2e694200c" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom" /></a> <a href="https://issues.shibboleth.net/jira/browse/SSPCPP-668" style="color: #3b73af; text-decoration: none">SSPCPP-668</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/SSPCPP-668" style="color: #3b73af; text-decoration: none">syntactically incorrect PAOS ECP Accept header processed without error</a> </span>
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Issue Type:
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Affects Versions:
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2.5.3
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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="cantor.2@osu.edu" id="email_cantor.2@osu.edu" href="https://issues.shibboleth.net/jira/secure/ViewProfile.jspa?name=cantor.2%40osu.edu" style="color:#3b73af;; color: #3b73af; text-decoration: none">Scott Cantor</a>
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Components:
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Request Processing
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Created:
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23/Aug/15 10:24 AM
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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="jdennis@idp.protectnetwork.org" id="email_jdennis@idp.protectnetwork.org" href="https://issues.shibboleth.net/jira/secure/ViewProfile.jspa?name=jdennis%40idp.protectnetwork.org" style="color:#3b73af;; color: #3b73af; text-decoration: none">jdennis@idp.protectnetwork.org</a>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">The following SAML specs:</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">"Profiles for the OASIS Security Assertion Markup Language (SAML) V2.0 5 OASIS Standard, 15 March 2005"</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">"SAML V2.0 Enhanced Client or Proxy Profile Version 2.0 Committee Specification 01 26 August 2013"</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">both use the following non-normative example of an Accept header:</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Accept: text/html; application/vnd.paos+xml</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">In this example there are supposed to be two media types, html and paos, but the separator between the media types is a semicolon when instead it should be a comma, at least that's how I'm reading the HTTP spec</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0"><a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html</a></p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">A semicolon is used to separate the type from it's optional parameters, types and their associated parameters are separated by commas. The example appearing in the SAML specs is illegal HTTP syntax because it's stating there is one media type of text/html with a parameter of application/vnd.paos+xml (which is nonsensical).</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">So why does this work in mod_shib? In the v2.5.3 code (the only version I checked) shibsp/handler/impl/SAML2SessionInitiator.cpp line 249 uses this code to test for paos in the accept header:</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">request.getHeader("Accept").find("application/vnd.paos+xml")</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">however doing a string search is not the same thing as parsing the header and can lead to erroneous results.</p>
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