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The /lnurl/proxy, /decode and /encode handlers fetched an arbitrary
user-supplied URL via got() and returned the body — an unauthenticated
SSRF reaching internal services. Route those fetches through a new
safeGot() that rejects hosts resolving to loopback/private/link-local/
CGNAT/metadata ranges, re-validates on each redirect hop, restricts the
scheme to http(s), and caps timeout + response size. Also validate the
NIP-57 zap request (kind 9734 + signature) before storing it, instead of
trusting the client-supplied event.
These endpoints can't be removed — they back lightning-address/LNURL
parsing and resolution in the wallet UI.
Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>
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