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04-onion-routing: strict validation of scid for blinded payments (#1147)

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This commit updates bolt04 to more strictly enforce that encrypted_data
that is part of a blinded payment only has short_channel_id set. On
the reader side, we disallow setting of both short_channel_id and
next_node_id (which is intended for use in the context of onion
messages), and on the writer side we specify that next_node_id should
not be included by recipients.
This commit is contained in:
Carla Kirk-Cohen 2024-03-12 04:56:54 -04:00 committed by GitHub
parent 60de4a0972
commit 78e5a6b066
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04-onion-routing.md
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@ -245,6 +245,7 @@ The creator of `encrypted_recipient_data` (usually, the recipient of payment):
- MUST create `encrypted_data_tlv` for each node in the blinded route (including itself).
- MUST include `encrypted_data_tlv.short_channel_id` and `encrypted_data_tlv.payment_relay` for each non-final node.
- MUST NOT include `encrypted_data_tlv.next_node_id`.
- MUST set `encrypted_data_tlv.payment_constraints` for each non-final node:
- `max_cltv_expiry` to the largest block height at which the route is allowed to be used, starting
from the final node and adding `encrypted_data_tlv.payment_relay.cltv_expiry_delta` at each hop.
@ -304,6 +305,7 @@ The reader:
- MUST process the message as if it were present and contained an empty array.
- MUST return an error if:
- `encrypted_recipient_data.allowed_features.features` contains an unknown feature bit (even if it is odd).
- `encrypted_recipient_data` contains both `short_channel_id` and `next_node_id`.
- the payment uses a feature not included in `encrypted_recipient_data.allowed_features.features`.
- If it is not the final node:
- MUST return an error if the payload contains other tlv fields than `encrypted_recipient_data` and `current_blinding_point`.