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channel-lease: validate accepter's sig on lease terms

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This commit is contained in:
niftynei
2021-06-14 14:22:46 -05:00
committed by neil saitug
parent 89f210fcd6
commit 9dd0a2c2e5
10 changed files with 343 additions and 26 deletions
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70
lightningd/dual_open_control.c
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@@ -1913,6 +1913,72 @@ static void handle_peer_tx_sigs_msg(struct subd *dualopend,
inflight->funding_psbt);
}
static bool verify_option_will_fund_signature(struct peer *peer,
struct pubkey *funding_pubkey,
u32 lease_expiry,
u32 chan_fee_msat,
u16 chan_fee_ppt,
const secp256k1_ecdsa_signature *sig)
{
struct pubkey their_pubkey;
struct sha256 sha;
int ret;
lease_rates_get_commitment(funding_pubkey, lease_expiry,
chan_fee_msat, chan_fee_ppt,
&sha);
if (!pubkey_from_node_id(&their_pubkey, &peer->id)) {
log_broken(peer->ld->log,
"Unable to extract pubkey from peer's node id %s",
type_to_string(tmpctx, struct node_id, &peer->id));
return false;
}
ret = secp256k1_ecdsa_verify(secp256k1_ctx, sig, sha.u.u8,
&their_pubkey.pubkey);
return ret == 1;
}
static void handle_validate_lease(struct subd *dualopend,
const u8 *msg)
{
const secp256k1_ecdsa_signature sig;
u16 chan_fee_max_ppt;
u32 chan_fee_max_base_msat, lease_expiry;
struct pubkey their_pubkey;
struct channel *chan;
char *err_msg;
if (!fromwire_dualopend_validate_lease(msg,
cast_const(secp256k1_ecdsa_signature *, &sig),
&lease_expiry,
&chan_fee_max_base_msat,
&chan_fee_max_ppt,
&their_pubkey)) {
channel_internal_error(dualopend->channel,
"Bad DUALOPEND_VALIDATE_LEASE: %s",
tal_hex(tmpctx, msg));
return;
}
assert(dualopend->channel);
chan = dualopend->channel;
if (!verify_option_will_fund_signature(chan->peer, &their_pubkey,
lease_expiry,
chan_fee_max_base_msat,
chan_fee_max_ppt,
&sig))
err_msg = "Unable to verify sig";
else
err_msg = NULL;
subd_send_msg(dualopend,
take(towire_dualopend_validate_lease_reply(NULL, err_msg)));
}
static void handle_validate_rbf(struct subd *dualopend,
const u8 *msg)
{
@@ -2929,6 +2995,9 @@ static unsigned int dual_opend_msg(struct subd *dualopend,
case WIRE_DUALOPEND_RBF_VALIDATE:
handle_validate_rbf(dualopend, msg);
return 0;
case WIRE_DUALOPEND_VALIDATE_LEASE:
handle_validate_lease(dualopend, msg);
return 0;
case WIRE_DUALOPEND_FUNDING_SIGS:
handle_peer_tx_sigs_msg(dualopend, msg);
return 0;
@@ -2967,6 +3036,7 @@ static unsigned int dual_opend_msg(struct subd *dualopend,
case WIRE_DUALOPEND_GOT_OFFER_REPLY:
case WIRE_DUALOPEND_GOT_RBF_OFFER_REPLY:
case WIRE_DUALOPEND_RBF_VALID:
case WIRE_DUALOPEND_VALIDATE_LEASE_REPLY:
case WIRE_DUALOPEND_FAIL:
case WIRE_DUALOPEND_PSBT_UPDATED:
case WIRE_DUALOPEND_SEND_TX_SIGS: