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discovery+routing: validate msg flags and max htlc in ChannelUpdates

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In this commit, we alter the ValidateChannelUpdateAnn function in
ann_validation to validate a remote ChannelUpdate's message flags
and max HTLC field. If the message flag is set but the max HTLC
field is not set or vice versa, the ChannelUpdate fails validation.

Co-authored-by: Johan T. Halseth <johanth@gmail.com>
This commit is contained in:
Valentine Wallace
2019-01-12 18:59:43 +01:00
committed by Johan T. Halseth
parent f316cc6c7e
commit 15168c391e
4 changed files with 150 additions and 18 deletions
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10
routing/router.go
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@@ -2060,12 +2060,18 @@ func (r *ChannelRouter) applyChannelUpdate(msg *lnwire.ChannelUpdate,
return true
}
if err := ValidateChannelUpdateAnn(pubKey, msg); err != nil {
ch, _, _, err := r.GetChannelByID(msg.ShortChannelID)
if err != nil {
log.Errorf("Unable to retrieve channel by id: %v", err)
return false
}
if err := ValidateChannelUpdateAnn(pubKey, ch.Capacity, msg); err != nil {
log.Errorf("Unable to validate channel update: %v", err)
return false
}
err := r.UpdateEdge(&channeldb.ChannelEdgePolicy{
err = r.UpdateEdge(&channeldb.ChannelEdgePolicy{
SigBytes: msg.Signature.ToSignatureBytes(),
ChannelID: msg.ShortChannelID.ToUint64(),
LastUpdate: time.Unix(int64(msg.Timestamp), 0),