[v11] Proxy Client #24737
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rosstimothy merged 2 commits intobranch/v11from Apr 21, 2023
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A new `api/client/proxy/Client` has been added to interact with the SSH and gRPC servers that the Proxy serves on its SSH port. The client will first try connecting to the gRPC server and if that fails it will fall back to the SSH server. Much of the SSH functionality mimics the existing behavior of the `ProxyClient` in `lib/client`. This is the first part of phasing out that client in favor of the new client. There will be a follow up PR that migrates `lib/client` to make use of the new client instead. Part of #19812
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Instead of relying on users to provide the cluster name, the client now determines the cluster name by inspecting the certificate presented by the Proxy during the TLS or SSH handshake. This is required when connecting to a Proxy via a jump host since the name of the cluster may not match the currently logged in cluster. This is achieved by leveraging a custom `credentials.TransportCredentials` when connecting via gRPC and a custom `ssh.HostKeyCallback` when connecting SSH.
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Backports just the SSH portion of the api/proxy.Client from #22629 and #23644 to branch/v11. The Proxy gRPC server only exists on branch/v13 and later.