356 lines
11 KiB
Go
356 lines
11 KiB
Go
package nebula
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import (
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"context"
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"errors"
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"fmt"
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"sync/atomic"
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"github.com/sirupsen/logrus"
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"github.com/slackhq/nebula/config"
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"github.com/slackhq/nebula/header"
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"github.com/slackhq/nebula/iputil"
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)
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type relayManager struct {
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l *logrus.Logger
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hostmap *HostMap
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amRelay atomic.Bool
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}
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func NewRelayManager(ctx context.Context, l *logrus.Logger, hostmap *HostMap, c *config.C) *relayManager {
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rm := &relayManager{
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l: l,
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hostmap: hostmap,
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}
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rm.reload(c, true)
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c.RegisterReloadCallback(func(c *config.C) {
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err := rm.reload(c, false)
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if err != nil {
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l.WithError(err).Error("Failed to reload relay_manager")
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}
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})
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return rm
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}
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func (rm *relayManager) reload(c *config.C, initial bool) error {
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if initial || c.HasChanged("relay.am_relay") {
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rm.setAmRelay(c.GetBool("relay.am_relay", false))
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}
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return nil
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}
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func (rm *relayManager) GetAmRelay() bool {
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return rm.amRelay.Load()
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}
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func (rm *relayManager) setAmRelay(v bool) {
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rm.amRelay.Store(v)
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}
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// AddRelay finds an available relay index on the hostmap, and associates the relay info with it.
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// relayHostInfo is the Nebula peer which can be used as a relay to access the target vpnIp.
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func AddRelay(l *logrus.Logger, relayHostInfo *HostInfo, hm *HostMap, vpnIp iputil.VpnIp, remoteIdx *uint32, relayType int, state int) (uint32, error) {
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hm.Lock()
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defer hm.Unlock()
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for i := 0; i < 32; i++ {
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index, err := generateIndex(l)
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if err != nil {
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return 0, err
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}
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_, inRelays := hm.Relays[index]
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if !inRelays {
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// Avoid standing up a relay that can't be used since only the primary hostinfo
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// will be pointed to by the relay logic
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//TODO: if there was an existing primary and it had relay state, should we merge?
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hm.unlockedMakePrimary(relayHostInfo)
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hm.Relays[index] = relayHostInfo
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newRelay := Relay{
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Type: relayType,
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State: state,
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LocalIndex: index,
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PeerIp: vpnIp,
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}
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if remoteIdx != nil {
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newRelay.RemoteIndex = *remoteIdx
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}
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relayHostInfo.relayState.InsertRelay(vpnIp, index, &newRelay)
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return index, nil
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}
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}
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return 0, errors.New("failed to generate unique localIndexId")
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}
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// EstablishRelay updates a Requested Relay to become an Established Relay, which can pass traffic.
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func (rm *relayManager) EstablishRelay(relayHostInfo *HostInfo, m *NebulaControl) (*Relay, error) {
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relay, ok := relayHostInfo.relayState.CompleteRelayByIdx(m.InitiatorRelayIndex, m.ResponderRelayIndex)
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if !ok {
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rm.l.WithFields(logrus.Fields{"relay": relayHostInfo.vpnIp,
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"initiatorRelayIndex": m.InitiatorRelayIndex,
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"relayFrom": m.RelayFromIp,
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"relayTo": m.RelayToIp}).Info("relayManager failed to update relay")
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return nil, fmt.Errorf("unknown relay")
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}
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return relay, nil
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}
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func (rm *relayManager) HandleControlMsg(h *HostInfo, m *NebulaControl, f *Interface) {
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switch m.Type {
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case NebulaControl_CreateRelayRequest:
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rm.handleCreateRelayRequest(h, f, m)
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case NebulaControl_CreateRelayResponse:
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rm.handleCreateRelayResponse(h, f, m)
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}
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}
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func (rm *relayManager) handleCreateRelayResponse(h *HostInfo, f *Interface, m *NebulaControl) {
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rm.l.WithFields(logrus.Fields{
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"relayFrom": iputil.VpnIp(m.RelayFromIp),
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"relayTo": iputil.VpnIp(m.RelayToIp),
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"initiatorRelayIndex": m.InitiatorRelayIndex,
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"responderRelayIndex": m.ResponderRelayIndex,
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"vpnIp": h.vpnIp}).
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Info("handleCreateRelayResponse")
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target := iputil.VpnIp(m.RelayToIp)
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relay, err := rm.EstablishRelay(h, m)
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if err != nil {
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rm.l.WithError(err).Error("Failed to update relay for relayTo")
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return
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}
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// Do I need to complete the relays now?
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if relay.Type == TerminalType {
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return
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}
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// I'm the middle man. Let the initiator know that the I've established the relay they requested.
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peerHostInfo := rm.hostmap.QueryVpnIp(relay.PeerIp)
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if peerHostInfo == nil {
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rm.l.WithField("relayTo", relay.PeerIp).Error("Can't find a HostInfo for peer")
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return
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}
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peerRelay, ok := peerHostInfo.relayState.QueryRelayForByIp(target)
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if !ok {
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rm.l.WithField("relayTo", peerHostInfo.vpnIp).Error("peerRelay does not have Relay state for relayTo")
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return
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}
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if peerRelay.State == PeerRequested {
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peerRelay.State = Established
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resp := NebulaControl{
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Type: NebulaControl_CreateRelayResponse,
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ResponderRelayIndex: peerRelay.LocalIndex,
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InitiatorRelayIndex: peerRelay.RemoteIndex,
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RelayFromIp: uint32(peerHostInfo.vpnIp),
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RelayToIp: uint32(target),
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}
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msg, err := resp.Marshal()
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if err != nil {
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rm.l.
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WithError(err).Error("relayManager Failed to marshal Control CreateRelayResponse message to create relay")
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} else {
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f.SendMessageToHostInfo(header.Control, 0, peerHostInfo, msg, make([]byte, 12), make([]byte, mtu))
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rm.l.WithFields(logrus.Fields{
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"relayFrom": iputil.VpnIp(resp.RelayFromIp),
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"relayTo": iputil.VpnIp(resp.RelayToIp),
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"initiatorRelayIndex": resp.InitiatorRelayIndex,
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"responderRelayIndex": resp.ResponderRelayIndex,
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"vpnIp": peerHostInfo.vpnIp}).
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Info("send CreateRelayResponse")
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}
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}
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}
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func (rm *relayManager) handleCreateRelayRequest(h *HostInfo, f *Interface, m *NebulaControl) {
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from := iputil.VpnIp(m.RelayFromIp)
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target := iputil.VpnIp(m.RelayToIp)
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logMsg := rm.l.WithFields(logrus.Fields{
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"relayFrom": from,
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"relayTo": target,
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"initiatorRelayIndex": m.InitiatorRelayIndex,
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"vpnIp": h.vpnIp})
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logMsg.Info("handleCreateRelayRequest")
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// Is the source of the relay me? This should never happen, but did happen due to
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// an issue migrating relays over to newly re-handshaked host info objects.
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if from == f.myVpnIp {
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logMsg.WithField("myIP", f.myVpnIp).Error("Discarding relay request from myself")
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return
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}
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// Is the target of the relay me?
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if target == f.myVpnIp {
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existingRelay, ok := h.relayState.QueryRelayForByIp(from)
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if ok {
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switch existingRelay.State {
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case Requested:
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ok = h.relayState.CompleteRelayByIP(from, m.InitiatorRelayIndex)
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if !ok {
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logMsg.Error("Relay State not found")
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return
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}
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case Established:
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if existingRelay.RemoteIndex != m.InitiatorRelayIndex {
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// We got a brand new Relay request, because its index is different than what we saw before.
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// This should never happen. The peer should never change an index, once created.
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logMsg.WithFields(logrus.Fields{
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"existingRemoteIndex": existingRelay.RemoteIndex}).Error("Existing relay mismatch with CreateRelayRequest")
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return
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}
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}
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} else {
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_, err := AddRelay(rm.l, h, f.hostMap, from, &m.InitiatorRelayIndex, TerminalType, Established)
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if err != nil {
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logMsg.WithError(err).Error("Failed to add relay")
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return
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}
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}
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relay, ok := h.relayState.QueryRelayForByIp(from)
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if !ok {
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logMsg.Error("Relay State not found")
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return
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}
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resp := NebulaControl{
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Type: NebulaControl_CreateRelayResponse,
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ResponderRelayIndex: relay.LocalIndex,
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InitiatorRelayIndex: relay.RemoteIndex,
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RelayFromIp: uint32(from),
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RelayToIp: uint32(target),
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}
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msg, err := resp.Marshal()
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if err != nil {
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logMsg.
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WithError(err).Error("relayManager Failed to marshal Control CreateRelayResponse message to create relay")
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} else {
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f.SendMessageToHostInfo(header.Control, 0, h, msg, make([]byte, 12), make([]byte, mtu))
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rm.l.WithFields(logrus.Fields{
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"relayFrom": iputil.VpnIp(resp.RelayFromIp),
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"relayTo": iputil.VpnIp(resp.RelayToIp),
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"initiatorRelayIndex": resp.InitiatorRelayIndex,
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"responderRelayIndex": resp.ResponderRelayIndex,
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"vpnIp": h.vpnIp}).
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Info("send CreateRelayResponse")
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}
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return
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} else {
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// the target is not me. Create a relay to the target, from me.
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if !rm.GetAmRelay() {
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return
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}
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peer := rm.hostmap.QueryVpnIp(target)
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if peer == nil {
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// Try to establish a connection to this host. If we get a future relay request,
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// we'll be ready!
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f.Handshake(target)
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return
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}
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if peer.remote == nil {
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// Only create relays to peers for whom I have a direct connection
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return
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}
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sendCreateRequest := false
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var index uint32
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var err error
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targetRelay, ok := peer.relayState.QueryRelayForByIp(from)
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if ok {
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index = targetRelay.LocalIndex
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if targetRelay.State == Requested {
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sendCreateRequest = true
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}
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} else {
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// Allocate an index in the hostMap for this relay peer
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index, err = AddRelay(rm.l, peer, f.hostMap, from, nil, ForwardingType, Requested)
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if err != nil {
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return
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}
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sendCreateRequest = true
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}
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if sendCreateRequest {
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// Send a CreateRelayRequest to the peer.
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req := NebulaControl{
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Type: NebulaControl_CreateRelayRequest,
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InitiatorRelayIndex: index,
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RelayFromIp: uint32(h.vpnIp),
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RelayToIp: uint32(target),
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}
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msg, err := req.Marshal()
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if err != nil {
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logMsg.
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WithError(err).Error("relayManager Failed to marshal Control message to create relay")
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} else {
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f.SendMessageToHostInfo(header.Control, 0, peer, msg, make([]byte, 12), make([]byte, mtu))
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rm.l.WithFields(logrus.Fields{
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"relayFrom": iputil.VpnIp(req.RelayFromIp),
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"relayTo": iputil.VpnIp(req.RelayToIp),
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"initiatorRelayIndex": req.InitiatorRelayIndex,
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"responderRelayIndex": req.ResponderRelayIndex,
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"vpnIp": target}).
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Info("send CreateRelayRequest")
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}
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}
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// Also track the half-created Relay state just received
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relay, ok := h.relayState.QueryRelayForByIp(target)
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if !ok {
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// Add the relay
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state := PeerRequested
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if targetRelay != nil && targetRelay.State == Established {
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state = Established
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}
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_, err := AddRelay(rm.l, h, f.hostMap, target, &m.InitiatorRelayIndex, ForwardingType, state)
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if err != nil {
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logMsg.
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WithError(err).Error("relayManager Failed to allocate a local index for relay")
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return
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}
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} else {
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switch relay.State {
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case Established:
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if relay.RemoteIndex != m.InitiatorRelayIndex {
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// We got a brand new Relay request, because its index is different than what we saw before.
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// This should never happen. The peer should never change an index, once created.
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logMsg.WithFields(logrus.Fields{
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"existingRemoteIndex": relay.RemoteIndex}).Error("Existing relay mismatch with CreateRelayRequest")
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return
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}
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resp := NebulaControl{
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Type: NebulaControl_CreateRelayResponse,
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ResponderRelayIndex: relay.LocalIndex,
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InitiatorRelayIndex: relay.RemoteIndex,
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RelayFromIp: uint32(h.vpnIp),
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RelayToIp: uint32(target),
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}
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msg, err := resp.Marshal()
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if err != nil {
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rm.l.
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WithError(err).Error("relayManager Failed to marshal Control CreateRelayResponse message to create relay")
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} else {
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f.SendMessageToHostInfo(header.Control, 0, h, msg, make([]byte, 12), make([]byte, mtu))
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rm.l.WithFields(logrus.Fields{
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"relayFrom": iputil.VpnIp(resp.RelayFromIp),
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"relayTo": iputil.VpnIp(resp.RelayToIp),
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"initiatorRelayIndex": resp.InitiatorRelayIndex,
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"responderRelayIndex": resp.ResponderRelayIndex,
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"vpnIp": h.vpnIp}).
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Info("send CreateRelayResponse")
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}
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case Requested:
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// Keep waiting for the other relay to complete
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}
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}
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}
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}
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func (rm *relayManager) RemoveRelay(localIdx uint32) {
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rm.hostmap.RemoveRelay(localIdx)
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}
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