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daemon: don't save invalid commit signatures.

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We don't want anyone to think the commitment tx is signed, so only
assign ci->sig after validation.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2016-06-29 06:49:20 +09:30
parent d1416ea5b5
commit 50bffd67c2
1 changed files with 12 additions and 4 deletions
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16
daemon/packets.c
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@ -526,21 +526,29 @@ static Pkt *check_and_save_commit_sig(struct peer *peer,
struct commit_info *ci,
const Signature *pb)
{
struct bitcoin_signature *sig = tal(ci, struct bitcoin_signature);
assert(!ci->sig);
ci->sig = tal(ci, struct bitcoin_signature);
ci->sig->stype = SIGHASH_ALL;
if (!proto_to_signature(pb, &ci->sig->sig))
sig->stype = SIGHASH_ALL;
if (!proto_to_signature(pb, &sig->sig))
return pkt_err(peer, "Malformed signature");
log_debug(peer->log, "Checking sig for %u/%u msatoshis, %zu/%zu htlcs",
ci->cstate->side[OURS].pay_msat,
ci->cstate->side[THEIRS].pay_msat,
tal_count(ci->cstate->side[OURS].htlcs),
tal_count(ci->cstate->side[THEIRS].htlcs));
/* Their sig should sign our commit tx. */
if (!check_tx_sig(peer->dstate->secpctx,
ci->tx, 0,
NULL, 0,
peer->anchor.witnessscript,
&peer->remote.commitkey,
ci->sig))
sig))
return pkt_err(peer, "Bad signature");
ci->sig = sig;
return NULL;
}