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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/EDS" style="color: #3b73af; text-decoration: none">Embedded Discovery Service</a> / <a href="https://issues.shibboleth.net/jira/browse/EDS-70" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-static-bug-419c4a68-f56a-41fa-a8ff-bbce8a6e5d80" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom" /></a> <a href="https://issues.shibboleth.net/jira/browse/EDS-70" style="color: #3b73af; text-decoration: none">EDS-70</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/EDS-70" style="color: #3b73af; text-decoration: none">EDS parameters in defaultReturn containing multiple = signs are ignored</a> </span>
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Issue Type:
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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="rdw@iay.org.uk" id="email_rdw@iay.org.uk" href="https://issues.shibboleth.net/jira/secure/ViewProfile.jspa?name=rdw%40iay.org.uk" style="color:#3b73af;; color: #3b73af; text-decoration: none">Rod Widdowson</a>
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param-splitting-fix.patch
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Created:
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19/Jun/15 1:58 AM
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Environment:
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Using the latest r157 from SVN.</p>
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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="lvycz7whxtxbx2sxqk8axpc0ugi@https://idp.jcu.edu.au/idp/shibboleth" id="email_lvycz7whxtxbx2sxqk8axpc0ugi@https://idp.jcu.edu.au/idp/shibboleth" href="https://issues.shibboleth.net/jira/secure/ViewProfile.jspa?name=lvycz7whxtxbx2sxqk8axpc0ugi%40https%3A%2F%2Fidp.jcu.edu.au%2Fidp%2Fshibboleth" style="color:#3b73af;; color: #3b73af; text-decoration: none">David Beitey</a>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">My EDS needs to pass the Shibboleth login responder (eg /Shibboleth.sso/Login) a <tt>target</tt> URL as a parameter in order for the user to be sent to the correct page on my site on returning after login. The issue I'm currently facing is that my <tt>target</tt> URL contains an equals sign.</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">With the way existing code works (line 338 onwards of idpselect.js), parameters present in <tt>defaultURL</tt> are extracted for inclusion as hidden fields on the EDS form. However, during this process, parameters in the query string of <tt>defaultURL</tt> are split in JavaScript based upon <em>any</em> instances of the <tt>=</tt> character. If the resulting <tt>parmList</tt> has anything but 2 elements, the parameter is skipped. This means that a valid parameter like this: </p>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">target=<a href="https://espaces.edu.au/logged_in?came_from=https%3A//espaces.edu.au/blah" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">https://espaces.edu.au/logged_in?came_from=https%3A//espaces.edu.au/blah</a></p>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">is thus ignored, because the two equal signs create a array of 3 elements when split. </p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">I've attached a patch which fixes this issue, by splitting only on the first equal sign, which ensures the first element of relevant <tt>parmPair</tt> is always the field key, and the second is always the value (containing all extra <tt>=</tt> chars if present).</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">The same issue was present with the processing of the <tt>window.location.search</tt> string if <tt>ignoreURLParams</tt> was not enabled; this is also fixed in the patch.</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">It's dry reading, but the Whatwg living standard on URL encoded parsing lives at <a href="https://url.spec.whatwg.org/#urlencoded-parsing" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">https://url.spec.whatwg.org/#urlencoded-parsing</a>. The most important bit is this:</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">{{2. If bytes contains a `=`, then let name be the bytes from the start of bytes up to but excluding its first `=`, and let value be the bytes, if any, after the first `=` up to the end of bytes. If `=` is the first byte, then name will be the empty byte sequence. If it is the last, then value will be the empty byte sequence.</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">3. Otherwise, let name have the value of bytes and let value be the empty byte sequence.<br /> }}</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">so the patch reflects both of these cases. For point 3 above, instead of just ignoring a URL parameter if it has no equal sign, the parameter will be considered now.</p>
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