This PR removes the `types.KindKubeService` objects that were
deprecated in Teleport 11.
Teleport 12 removed the double heartbeat and for Teleport 13 we can
safely drop the support of the old hearbeat based on `types.Server`
objects.
Clients older than Teleport 12 connecting to a Teleport 13 server will
fail since they cannot heartbeat using the old mechanism.
This PR includes a new Role resource version that is compatible with V5 spec.
The new resource introduces the `kubernetes_resources` definition that allows operators to limit the Kubernetes resources that each member can access. The `kubernetes_resources` entries must follow the following format: `{"kind":"<kind>", "namespace":"<namespace>","name":"<pod>"}`. Currently, it only supports objects of `kind` `pod`. Valid examples `<namespace>/<name>:
- `*/*`: matches all pods in all namespaces.
- `default/*`: matches all pods in the `default` namespace.
- `*/nginx-*`: matches every pod prefixed with `nginx-` in every namespace.
For older resource versions - V5, V4, V3 - `kubernetes_resources` is automatically populated with `{"kind":"pod","namespace":"*","name":"*"}` to keep compatibility. For the newest version, it's mandatory to define its value otherwise access to pods will be denied.
Part of #18434
Replace role/authPref RequireSessionMFA (bool) with RequireMFAType
(string).
- Add new RequireMFAType constant values with custom boolean marshalling.
- Add RequireMFAType to role and auth preference and deprecate
RequireSessionMFA.
- Add session-mfa override login when hardware_key_touch is enforced.
- Add protobuf enum for RequireMFAType.
- Add support for proto enums in protoc-gen-crd and update Kubernetes
Operator manifests.
## What
First part of the Kubernetes [Discovery RFD](https://github.com/gravitational/teleport/pull/13376/) to introduce a Kubernetes server per cluster.
This PR introduces a separate Kubernetes server that uses the already introduced `KubernetesClusterV3`.
## Compatibility
In previous versions, Kubernetes Clusters were part of regular `ServerV2` resource and this refactoring deprecates the `ServerV2` usage but keeps them for compatibility with previous version.
Everything is backward compatible, so v10 kubernetes agents and trusted clusters can connect fine.
## Next steps
Once this is merged, a new PR will introduce dynamic registration for Kubernetes Clusters discovered through EKS Discovery.
* Add client side circuit breaker to auth clients
In order to apply back pressure we can utilize a circuit breaker that
monitors error responses from auth server. When tripped it will prevent
all outbound requests to auth for a period of time. This can also help
prevent a potential thundering heard when auth is in an unhealthy state.
By default the circuit breaker will only be tripped if 90% of the
requests made in the monitoring interval fail.
When the client connects to teleport with invalid credentials (eg
expired ones) it will retry multiple times until the context deadline is
reached.
When it happens, we receive the generic error: context deadline
exceeded.
However, we can ask for the latest connection error, one which will give
us more information on why it happened.
To ask for this extra error we need to add the following
grpc.DialOption: grpc.WithReturnConnectionError()
After doing this, we will get the errors that happenned when trying to
connect to the grpc Server.
This should help us debug possible connection problems.
We had to refactor a little bit the way we handle the parallel
connection attempts to receive all the connection errors from the
multiple flows.
* The web UI needed to show the total count of resources available after filter
* ListResources response returns as a struct to make adding extra fields easier
Tiago Silva