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Refactor handshake_ix (#401)

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There are some subtle race conditions with the previous handshake_ix implementation, mostly around collisions with localIndexId. This change refactors it so that we have a "commit" phase during the handshake where we grab the lock for the hostmap and ensure that we have a unique local index before storing it. We also now avoid using the pending hostmap at all for receiving stage1 packets, since we have everything we need to just store the completed handshake.

Co-authored-by: Nate Brown <nbrown.us@gmail.com>
Co-authored-by: Ryan Huber <rhuber@gmail.com>
Co-authored-by: forfuncsake <drussell@slack-corp.com>
This commit is contained in:
Wade Simmons
2021-03-12 14:16:25 -05:00
committed by GitHub
parent 64d8035d09
commit 6c55d67f18
6 changed files with 345 additions and 315 deletions
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19
handshake.go
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@ -6,30 +6,23 @@ const (
)
func HandleIncomingHandshake(f *Interface, addr *udpAddr, packet []byte, h *Header, hostinfo *HostInfo) {
newHostinfo, _ := f.handshakeManager.QueryIndex(h.RemoteIndex)
//TODO: For stage 1 we won't have hostinfo yet but stage 2 and above would require it, this check may be helpful in those cases
//if err != nil {
// l.WithError(err).WithField("udpAddr", addr).Error("Error while finding host info for handshake message")
// return
//}
if !f.lightHouse.remoteAllowList.Allow(udp2ipInt(addr)) {
l.WithField("udpAddr", addr).Debug("lighthouse.remote_allow_list denied incoming handshake")
return
}
tearDown := false
switch h.Subtype {
case handshakeIXPSK0:
switch h.MessageCounter {
case 1:
tearDown = ixHandshakeStage1(f, addr, newHostinfo, packet, h)
ixHandshakeStage1(f, addr, packet, h)
case 2:
tearDown = ixHandshakeStage2(f, addr, newHostinfo, packet, h)
newHostinfo, _ := f.handshakeManager.QueryIndex(h.RemoteIndex)
tearDown := ixHandshakeStage2(f, addr, newHostinfo, packet, h)
if tearDown && newHostinfo != nil {
f.handshakeManager.DeleteHostInfo(newHostinfo)
}
}
}
if tearDown && newHostinfo != nil {
f.handshakeManager.DeleteHostInfo(newHostinfo)
}
}