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Created by Clément OUDOT@clement_oudotOwner

SessionIndex should not be mandatory in SAML SingleLogoutRequest

In our SAML IDP code, we require the SessionIndex in SLO request to make the full logout:

            # Get session index
            my $session_index;
            eval { $session_index = $logout->request()->SessionIndex; };

            # SLO requests without session index are not accepted
            if ( $@ or !defined $session_index ) {
                $self->lmLog(
                    "No session index in SLO request from $spConfKey SP",
                    'error' );
                return $self->sendSLOErrorResponse( $logout, $method );

Reading SAML specifications, this attribute is optional (saml-core-20-os.pdf, chapter 3.7.1):

<SessionIndex> [Optional]
The identifier that indexes this session at the message recipient.

So we should be able to accept these SLO request, and see how a logout is possible without the SessionIndex. This can be an option to activate per SAML SP.

Edited by Clément OUDOT