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<p style="margin: 10px 0 0 0">Another day another random walk through the problem space.</p>
<p style="margin: 10px 0 0 0">I have determined that the IHttpUser.IsInRole method can be called from standard IIS URL AuthN. In my experiment I arranged for all Shibboleth Authorized users to get a principal which said "true" in response to IsInRole("ShibUser"). I then set up URI Authorization as per the documentation (turn it on in programs and features) and configured it (from IISMgr) to protect my virtual dir unless you you are a member of that group.Hey presto one gets access if logged in and not if not.</p>
<p style="margin: 10px 0 0 0">In order for this to work one needs to have configured Shib to do the AuthZ (the AuthN happens at a later stage in the pipeline). This is actually how I tested it (I made the area under the IISN AuthN wider than the <Path> which has requireSession="true" on.)</p>
<p style="margin: 10px 0 0 0">By turning the debugger to be "Mixed" you get to see the entire stack at is swaps between native and managed code (4 times in this case) and the managed stack givces an insight into hat is going on. Even better a quick search yielded <a href="https://referencesource.microsoft.com/#System.Web/Hosting/IIS7UserPrincipal.cs,b4fede84f9e8da69" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">this site</a> which in turn led me to download of the C'# code that IIS uses and thus establish that there appears to be no calls made to GetUserVariable (which is a shame).</p>
<p style="margin: 10px 0 0 0">My next nature study will be into the nature of Claims based AuthN. Of course (as seems to be the usual case when I go head to head with an MS API) the documentation describes how to use, not how to provide the building blocks, but if they've broken it down correctly the Claims AuthN should be separate from the code (in ADFS or wherever) that provides the claims.</p>
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