[keycloak-user] Authenticating non-interactive users

[Juraci Paixão Kröhling]

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Hello,

I'm assisting on a project that is about to implement Keycloak for
user auth. They also need to authenticate/authorize non-interactive
users (as in: nodes talking to a server) and are considering using
Keycloak for that as well.

My first thought was to use OAuth, performing the initial OAuth flow
during the first boot of the server and then publishing the refresh
token to the nodes, so that they can get bearer tokens whenever they
need to talk to the server.

While the above works in my PoC, it's not ideal:
- - there has to be an unprotected resource, so that the node can get
the refresh token
- - the refresh token is related to the admin that first installed the
server
- - related to the above: auditing is harder, as the requests were
appear to come from said admin
- - node and server are the same application from the user's
perspective, so, it makes no sense to have an "OAuth client" and an
"Application" on Keycloak.
- - having an extra code for the initial OAuth flow seems a bit counter
productive

There are some examples where part of this scenario could be covered,
like the "KeycloakInstalled" from the integration project, but it also
doesn't seems to quite fit into this.

So, my questions would be:

- - Would there be a better solution based on the latest Keycloak?
- - If not, is this scenario something that would be interesting
implementing?

The advantage I see in having this implemented on Keycloak instead of
baking a new solution is that the application wouldn't need to care if
the request is coming from a non-interactive user or a real user, as
long as the proper roles are set. Also, having one single auth
mechanism for both non-interactive and interactive users is far better
than mixing mechanisms based on the path.

Juca.
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