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gossipd: disallow far future (+1 day) or far past (2 weeks) timestamps.

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Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2019-09-18 10:34:56 +09:30
parent 76860683aa
commit 8139164aa0
1 changed files with 34 additions and 0 deletions
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34
gossipd/routing.c
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@ -195,6 +195,21 @@ static void destroy_routing_state(struct routing_state *rstate)
local_chan_map_clear(&rstate->local_chan_map);
}
/* We don't check this when loading from the gossip_store: that would break
* our canned tests, and usually old gossip is better than no gossip */
static bool timestamp_reasonable(struct routing_state *rstate, u32 timestamp)
{
u64 now = gossip_time_now(rstate).ts.tv_sec;
/* More than one day ahead? */
if (timestamp > now + 24*60*60)
return false;
/* More than 2 weeks behind? */
if (timestamp < now - rstate->prune_timeout)
return false;
return true;
}
#if DEVELOPER
static void memleak_help_routing_tables(struct htable *memtable,
struct routing_state *rstate)
@ -1949,6 +1964,17 @@ bool routing_add_channel_update(struct routing_state *rstate,
}
}
/* Check timestamp is sane (unless from store). */
if (!index && !timestamp_reasonable(rstate, timestamp)) {
status_debug("Ignoring update timestamp %u for %s/%u",
timestamp,
type_to_string(tmpctx,
struct short_channel_id,
&short_channel_id),
direction);
return false;
}
/* OK, we're going to accept this, so create chan if doesn't exist */
if (uc) {
assert(!chan);
@ -2267,6 +2293,14 @@ bool routing_add_node_announcement(struct routing_state *rstate,
status_debug("Received node_announcement for node %s",
type_to_string(tmpctx, struct node_id, &node_id));
/* Check timestamp is sane (unless from gossip_store). */
if (!index && !timestamp_reasonable(rstate, timestamp)) {
status_debug("Ignoring node_announcement timestamp %u for %s",
timestamp,
type_to_string(tmpctx, struct node_id, &node_id));
return false;
}
node = get_node(rstate, &node_id);
if (node == NULL || !node_has_broadcastable_channels(node)) {