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gossip: Verify channel_update signatures

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Christian Decker 2017-04-03 13:29:03 +09:30 • committed by Rusty Russell
parent 58196b5a32
commit a215cb47f1
1 changed files with 17 additions and 0 deletions
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17
daemon/routing.c
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@ -635,6 +635,19 @@ u8 *write_ip(const tal_t *ctx, const char *srcip, int port)
}
}
/* Verify the signature of a channel_update message */
static bool check_channel_update(const struct pubkey *node_key,
const secp256k1_ecdsa_signature *node_sig,
const u8 *update)
{
/* 2 byte msg type + 64 byte signatures */
int offset = 66;
struct sha256_double hash;
sha256_double(&hash, update + offset, tal_len(update) - offset);
return check_signed_hash(&hash, node_sig, node_key);
}
static bool check_channel_announcement(
const struct pubkey *node1_key, const struct pubkey *node2_key,
const struct pubkey *bitcoin1_key, const struct pubkey *bitcoin2_key,
@ -770,6 +783,10 @@ void handle_channel_update(struct routing_state *rstate, const u8 *update, size_
log_debug(rstate->base_log, "Ignoring outdated update.");
tal_free(tmpctx);
return;
} else if (!check_channel_update(&c->src->id, &signature, serialized)) {
log_debug(rstate->base_log, "Signature verification failed.");
tal_free(tmpctx);
return;
}
//FIXME(cdecker) Check signatures