Public bug reported:

On Ubuntu 14.04 we have a working shibboleth configuration, which when
used in Apache gives the SAML 2.0 attributes of the session in server
variables and the REMOTE_USER according to attribute mapping of
shibboleth.

On Ubuntu 16.04 the same configuration is reported as working by the
builtin shibboleth shibd -t configuration test, logging by shibboleth
and the Session handler of shibboleth shows that attributes come in and
are accurately decoded and mapped, session is established, but the
expected Apache server variables remain absent.

A scan of wiki entries for Shibboleth shows no needed configuration
changes. requestsetting of exportStdVars to true or "on" or 1 also does
not help.

Example of expected vars:
_SERVER["Shib-Application-ID"]  default
_SERVER["Shib-Session-ID"]      _abcdeef0cd3ff507b7f9e2394c625fd94
_SERVER["Shib-Identity-Provider"]       
http://adfs.example.com/adfs/services/trust
_SERVER["Shib-Authentication-Instant"]  2016-12-20T17:03:46.480Z
_SERVER["Shib-Authentication-Method"]   
urn:oasis:names:tc:SAML:2.0:ac:classes:PasswordProtectedTransport
_SERVER["Shib-AuthnContext-Class"]      
urn:oasis:names:tc:SAML:2.0:ac:classes:PasswordProtectedTransport
_SERVER["upn"]  ts...@example.com
_SERVER["AUTH_TYPE"] shibboleth
_SERVER["REMOTE_USER"]  ts...@example.com

** Affects: shibboleth-sp2 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apache saml shibboleth xenial

** Package changed: mpm-itk (Ubuntu) => shibboleth-sp2 (Ubuntu)

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https://bugs.launchpad.net/bugs/1651531

Title:
  libapache2-mod-shib2, no server variables of session

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