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volume: require admin auth and refuse loopback endpoints in FetchAndWriteNeedle Gate the RPC behind checkGrpcAdminAuth for parity with the rest of the destructive volume-server RPCs, and reject cluster-internal remote S3 endpoints (loopback / link-local / IMDS / RFC 1918 / CGNAT) before dialing. Pin the validated address against DNS rebinding by routing the AWS SDK through an HTTP transport whose DialContext re-resolves the host and re-applies the deny list on every dial, so an endpoint that resolves to a public IP at validate-time and then flips to 127.0.0.1 at connect time is refused. Operators that legitimately fetch from private hosts can opt out with -volume.allowUntrustedRemoteEndpoints.