security: sign registry registration (proof-of-possession) — PPA-003#38
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RegisterWithKeyOpts (the single builder emitting a public_key; RegisterWithKey funnels through it) now attaches a signature over "register:<listenAddr>:<publicKeyB64>", proving the submitter holds the private key for the registered public_key — matching the existing signed heartbeat/deregister/resolve operations. The challenge binds the public_key (defeats key-directory poisoning) and the listen_addr (hardens the re-registration endpoint-repoint vector), and is verifiable by the server before node_id assignment (node_id is not an input). Additive and backward-compatible: only an optional signature field is added, best-effort when a signer is configured; keyless/anonymous registration is unchanged. Server-side enforcement and registry-TLS-by-default are separate coordinated changes. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Superseded — registration proof-of-possession signing is already on main and shipped in v0.5.8/v0.5.9. |
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PPA-003: the register op establishes the node_id↔pubkey↔endpoint binding but was the only signed-op sibling carrying no signature. The client now signs
register:<listen_addr>:<public_key>and includes it assignature.Additive + wire-compatible: old registries ignoring the field still accept the registration; a signature-verifying registry (rendezvous PPA-003) gets proof-of-possession.
go test ./registry/...green.🤖 Generated with Claude Code