Why do we need UPA for rehydrating users in Sharepoint provider hosted app scenario?

Our on prem. SPS 2013 environment is configged to authenticate through ADFS against a third party IDP. We know nothing about these users, the returned SAML contains a role and based on this role we authorize user in SPS. This works great.
No we are investigating high-trust provider hosted apps (on prem, no azure acs). We have created a simple MVC, and configged it to use ADFS. Now if users are authenticated from SPS they can call the MVC and the ADFS token is reused. Works perfect. Only thing
is that whenever we need to call Sharepoint code through the client objectmodel, we get a 401 and the ULS shows that SPS is not able to map the incoming user to a user in User Profile DB. Off course it can't because the user is not in UPA and cannot be in
UPA beacuse the users are stored outside our domain and there is no way to sync these to our SPS environment. I read a couple of blogs about this issue and the all say that we ned to sync with the user repository to fill upa; but again that cannot be (suppose
on of our IDP's was facebook...?)
The construction works if we use apponly security, but now we lose our SPS security. So my real question is, can we some how workaround User Profile service in the scenario, or at least without needing to sync these users.
Any help/guidance is much appreciated!
Sander

Hi John,
No we were not able to find a solution. The provider hosted app-model of SPS 2013 just does not take into account that in some cases useraccounts are not available. We could not find a way around user rehydration. Off course you can all ways use another
security model like app-only policies, but that was not sufficient for us. It was also kind of disappointing there was no way to handle this; th emost problematic for me personal is that I cannot think of a reason why the rehydration can not be skipped in
some way. If you configure it to run within SPS itself, rehydration is not necessary, so why it seams mandatory in provider hosted app beats me ;-)
We went back to good old farm-solutions with webparts.
Sorry
Sander

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Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact
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Why do we need UPA for rehydrating users in Sharepoint provider hosted app scenario?

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