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Prevent preimage reveal collision while claiming onchain incoming HTLC (#808)

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See CVE-2020-26896 for context.
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Antoine Riard 2020-11-10 02:49:18 -05:00 committed by GitHub
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@ -314,6 +314,7 @@ A local node:
outgoing HTLC:
- MUST *resolve* the output by spending it, using the HTLC-success
transaction.
- MUST NOT reveal its own preimage when it's not the final recipient.<sup>[Preimage-Extraction](https://lists.linuxfoundation.org/pipermail/lightning-dev/2020-October/002857.html)</sup>
- MUST resolve the output of that HTLC-success transaction.
- otherwise:
- if the *remote node* is NOT irrevocably committed to the HTLC: