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keysend: Ignore keysends if the payload contains unknown even fields

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We must really make sure that we understand the entire payload, not just the
fields we are interested in.
This commit is contained in:
Christian Decker 2020-03-30 15:12:00 +02:00 • committed by Rusty Russell
parent 568773daad
commit b5b11a3f67
1 changed files with 17 additions and 2 deletions
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19
plugins/keysend.c
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@ -42,6 +42,8 @@ static struct command_result *htlc_accepted_call(struct command *cmd, const char
char *hexpreimage, *hexpaymenthash;
struct sha256 payment_hash;
bigsize_t s;
bool unknown_even_type = false;
struct tlv_field *field;
if (!payloadt)
return htlc_accepted_continue(cmd);
@ -58,8 +60,12 @@ static struct command_result *htlc_accepted_call(struct command *cmd, const char
/* Try looking for the field that contains the preimage */
for (int i=0; i<tal_count(payload->fields); i++) {
if (payload->fields[i].numtype == PREIMAGE_TLV_TYPE) {
preimage_field = &payload->fields[i];
field = &payload->fields[i];
if (field->numtype == PREIMAGE_TLV_TYPE) {
preimage_field = field;
break;
} else if (field->numtype % 2 == 0 && field->meta == NULL) {
unknown_even_type = true;
break;
}
}
@ -69,6 +75,15 @@ static struct command_result *htlc_accepted_call(struct command *cmd, const char
if (preimage_field == NULL)
return htlc_accepted_continue(cmd);
if (unknown_even_type) {
plugin_log(cmd->plugin, LOG_UNUSUAL,
"Payload contains unknown even TLV-type %" PRIu64
", can't safely accept the keysend. Deferring to "
"other plugins.",
preimage_field->numtype);
return htlc_accepted_continue(cmd);
}
/* If the preimage is not 32 bytes long then we can't accept the
* payment. */
if (preimage_field->length != 32) {