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channeld: check sha256_of_onion in update_fail_malformed_htlc

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This just logs for the moment
This commit is contained in:
darosior 2019-09-07 17:48:16 +02:00 committed by Rusty Russell
parent ea6c95b2b3
commit 57a8951b7a
1 changed files with 13 additions and 9 deletions
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22
channeld/channeld.c
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@ -1670,7 +1670,7 @@ static void handle_peer_fail_malformed_htlc(struct peer *peer, const u8 *msg)
struct channel_id channel_id;
u64 id;
enum channel_remove_err e;
struct sha256 sha256_of_onion;
struct sha256 sha256_of_onion, our_sha256_of_onion;
u16 failure_code;
struct htlc *htlc;
@ -1696,6 +1696,18 @@ static void handle_peer_fail_malformed_htlc(struct peer *peer, const u8 *msg)
failure_code);
}
/* BOLT #2:
*
* - if the `sha256_of_onion` in `update_fail_malformed_htlc`
* doesn't match the onion it sent:
* - MAY retry or choose an alternate error response.
*/
htlc = channel_get_htlc(peer->channel, LOCAL, id);
sha256(&our_sha256_of_onion, htlc->routing, tal_count(htlc->routing));
if (!sha256_eq(&sha256_of_onion, &our_sha256_of_onion))
status_unusual("update_fail_malformed_htlc for bad onion"
" for htlc with id %"PRIu64".", id);
/* We only handle these cases in make_failmsg, so convert any
* (future?) unknown one. */
if (failure_code != WIRE_INVALID_ONION_VERSION
@ -1710,14 +1722,6 @@ static void handle_peer_fail_malformed_htlc(struct peer *peer, const u8 *msg)
e = channel_fail_htlc(peer->channel, LOCAL, id, &htlc);
switch (e) {
case CHANNEL_ERR_REMOVE_OK:
/* FIXME: Do this! */
/* BOLT #2:
*
* - if the `sha256_of_onion` in `update_fail_malformed_htlc`
* doesn't match the onion it sent:
* - MAY retry or choose an alternate error response.
*/
/* This is the only case where we set failcode for a non-local
* failure; in a way, it is, since we have to report it. */
htlc->failcode = failure_code;