[Openid-specs-ab] Session cleanup via back-channel

[Pedro Felix]

Hi,

I've a scenario where a OIDC OP is acting as a bridge between upstream IdPs
using non-OIDC protocols (e.g Shibboleth) and downstream RPs using OIDC.
In this scenario I have the following requirements
  1) The upstream IdP notifies the OP of a session termination via
back-channel
  2) The OP propagate this cleanup notification to the downstream RPs, also
via back-channel (a back-channel to front-channel is not possible)

Unfortunately, the OIDC session management spec does not provide any way to
perform this back-channel cleanup, however I remember reading some meeting
notes about this possibility.

Is there anything that can be shared? I would like to align our solution
with what is being developed by this working group.

Thanks
Pedro
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