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df: fail channel if peer sends witnesses that aren't paid for

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The receiving node: ...
      - MUST fail the channel if:
        - the `witness_stack` weight lowers the effective `feerate`
          below the agreed upon transaction `feerate`
This commit is contained in:
niftynei 2021-03-03 14:52:17 -06:00 • committed by Rusty Russell
parent 9a849d6ba6
commit 26e4bae9ce
1 changed files with 53 additions and 0 deletions
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53
lightningd/dual_open_control.c
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@ -982,6 +982,23 @@ REGISTER_PLUGIN_HOOK(rbf_channel,
rbf_channel_hook_serialize,
struct rbf_channel_payload *);
static bool feerate_satisfied(struct wally_psbt *psbt,
u32 funding_feerate)
{
struct wally_tx *wtx;
size_t tx_weight;
struct amount_sat fee_paid, expected_fee;
wtx = psbt_final_tx(NULL, psbt);
tx_weight = wally_tx_weight(wtx);
tal_free(wtx);
fee_paid = psbt_compute_fee(psbt);
expected_fee = amount_tx_fee(funding_feerate, tx_weight);
return amount_sat_greater_eq(fee_paid, expected_fee);
}
static struct amount_sat calculate_reserve(struct channel_config *their_config,
struct amount_sat funding_total,
enum side opener)
@ -1419,6 +1436,24 @@ static void handle_peer_tx_sigs_sent(struct subd *dualopend,
&channel->funding,
&channel->funding_txid,
&channel->remote_funding_locked);
/* BOLT-f53ca2301232db780843e894f55d95d512f297f9 #2
* The receiving node: ...
* - MUST fail the channel if:
* - the `witness_stack` weight lowers the
* effective `feerate` below the agreed upon
* transaction `feerate`
*/
if (!feerate_satisfied(inflight->funding_psbt,
inflight->funding->feerate))
channel_fail_permanent(channel,
REASON_PROTOCOL,
"Agreed feerate %dperkw not"
" met with witnesses %s",
inflight->funding->feerate,
type_to_string(tmpctx,
struct wally_psbt,
inflight->funding_psbt));
}
}
@ -1716,6 +1751,24 @@ static void handle_peer_tx_sigs_msg(struct subd *dualopend,
&channel->funding,
&channel->funding_txid,
&channel->remote_funding_locked);
/* BOLT-f53ca2301232db780843e894f55d95d512f297f9 #2
* The receiving node: ...
* - MUST fail the channel if:
* - the `witness_stack` weight lowers the
* effective `feerate` below the agreed upon
* transaction `feerate`
*/
if (!feerate_satisfied(inflight->funding_psbt,
inflight->funding->feerate))
channel_fail_permanent(channel,
REASON_PROTOCOL,
"Agreed feerate %dperkw not"
" met with witnesses %s",
inflight->funding->feerate,
type_to_string(tmpctx,
struct wally_psbt,
inflight->funding_psbt));
}
/* Send notification with peer's signed PSBT */