mirror of https://github.com/slackhq/nebula.git
330 lines
9.0 KiB
Go
330 lines
9.0 KiB
Go
package nebula
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import (
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"context"
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"sync"
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"time"
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"github.com/sirupsen/logrus"
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"github.com/slackhq/nebula/header"
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)
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// TODO: incount and outcount are intended as a shortcut to locking the mutexes for every single packet
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// and something like every 10 packets we could lock, send 10, then unlock for a moment
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type connectionManager struct {
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hostMap *HostMap
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in map[uint32]struct{}
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inLock *sync.RWMutex
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out map[uint32]struct{}
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outLock *sync.RWMutex
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TrafficTimer *LockingTimerWheel[uint32]
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intf *Interface
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pendingDeletion map[uint32]int
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pendingDeletionLock *sync.RWMutex
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pendingDeletionTimer *LockingTimerWheel[uint32]
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checkInterval int
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pendingDeletionInterval int
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l *logrus.Logger
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// I wanted to call one matLock
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}
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func newConnectionManager(ctx context.Context, l *logrus.Logger, intf *Interface, checkInterval, pendingDeletionInterval int) *connectionManager {
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nc := &connectionManager{
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hostMap: intf.hostMap,
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in: make(map[uint32]struct{}),
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inLock: &sync.RWMutex{},
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out: make(map[uint32]struct{}),
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outLock: &sync.RWMutex{},
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TrafficTimer: NewLockingTimerWheel[uint32](time.Millisecond*500, time.Second*60),
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intf: intf,
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pendingDeletion: make(map[uint32]int),
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pendingDeletionLock: &sync.RWMutex{},
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pendingDeletionTimer: NewLockingTimerWheel[uint32](time.Millisecond*500, time.Second*60),
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checkInterval: checkInterval,
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pendingDeletionInterval: pendingDeletionInterval,
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l: l,
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}
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nc.Start(ctx)
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return nc
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}
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func (n *connectionManager) In(localIndex uint32) {
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n.inLock.RLock()
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// If this already exists, return
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if _, ok := n.in[localIndex]; ok {
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n.inLock.RUnlock()
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return
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}
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n.inLock.RUnlock()
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n.inLock.Lock()
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n.in[localIndex] = struct{}{}
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n.inLock.Unlock()
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}
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func (n *connectionManager) Out(localIndex uint32) {
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n.outLock.RLock()
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// If this already exists, return
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if _, ok := n.out[localIndex]; ok {
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n.outLock.RUnlock()
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return
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}
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n.outLock.RUnlock()
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n.outLock.Lock()
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// double check since we dropped the lock temporarily
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if _, ok := n.out[localIndex]; ok {
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n.outLock.Unlock()
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return
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}
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n.out[localIndex] = struct{}{}
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n.AddTrafficWatch(localIndex, n.checkInterval)
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n.outLock.Unlock()
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}
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func (n *connectionManager) CheckIn(localIndex uint32) bool {
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n.inLock.RLock()
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if _, ok := n.in[localIndex]; ok {
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n.inLock.RUnlock()
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return true
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}
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n.inLock.RUnlock()
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return false
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}
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func (n *connectionManager) ClearLocalIndex(localIndex uint32) {
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n.inLock.Lock()
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n.outLock.Lock()
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delete(n.in, localIndex)
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delete(n.out, localIndex)
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n.inLock.Unlock()
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n.outLock.Unlock()
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}
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func (n *connectionManager) ClearPendingDeletion(localIndex uint32) {
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n.pendingDeletionLock.Lock()
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delete(n.pendingDeletion, localIndex)
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n.pendingDeletionLock.Unlock()
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}
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func (n *connectionManager) AddPendingDeletion(localIndex uint32) {
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n.pendingDeletionLock.Lock()
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if _, ok := n.pendingDeletion[localIndex]; ok {
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n.pendingDeletion[localIndex] += 1
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} else {
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n.pendingDeletion[localIndex] = 0
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}
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n.pendingDeletionTimer.Add(localIndex, time.Second*time.Duration(n.pendingDeletionInterval))
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n.pendingDeletionLock.Unlock()
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}
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func (n *connectionManager) checkPendingDeletion(localIndex uint32) bool {
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n.pendingDeletionLock.RLock()
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if _, ok := n.pendingDeletion[localIndex]; ok {
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n.pendingDeletionLock.RUnlock()
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return true
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}
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n.pendingDeletionLock.RUnlock()
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return false
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}
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func (n *connectionManager) AddTrafficWatch(localIndex uint32, seconds int) {
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n.TrafficTimer.Add(localIndex, time.Second*time.Duration(seconds))
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}
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func (n *connectionManager) Start(ctx context.Context) {
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go n.Run(ctx)
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}
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func (n *connectionManager) Run(ctx context.Context) {
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clockSource := time.NewTicker(500 * time.Millisecond)
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defer clockSource.Stop()
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p := []byte("")
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nb := make([]byte, 12, 12)
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out := make([]byte, mtu)
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for {
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select {
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case <-ctx.Done():
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return
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case now := <-clockSource.C:
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n.HandleMonitorTick(now, p, nb, out)
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n.HandleDeletionTick(now)
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}
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}
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}
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func (n *connectionManager) HandleMonitorTick(now time.Time, p, nb, out []byte) {
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n.TrafficTimer.Advance(now)
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for {
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localIndex, has := n.TrafficTimer.Purge()
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if !has {
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break
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}
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// Check for traffic coming back in from this host.
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traf := n.CheckIn(localIndex)
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hostinfo, err := n.hostMap.QueryIndex(localIndex)
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if err != nil {
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n.l.WithField("localIndex", localIndex).Debugf("Not found in hostmap")
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n.ClearLocalIndex(localIndex)
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n.ClearPendingDeletion(localIndex)
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continue
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}
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if n.handleInvalidCertificate(now, hostinfo) {
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continue
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}
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// Does the vpnIp point to this hostinfo or is it ancillary? If we have ancillary hostinfos then we need to
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// decide if this should be the main hostinfo if we are seeing traffic on it
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primary, _ := n.hostMap.QueryVpnIp(hostinfo.vpnIp)
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mainHostInfo := true
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if primary != nil && primary != hostinfo {
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mainHostInfo = false
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}
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// If we saw an incoming packets from this ip and peer's certificate is not
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// expired, just ignore.
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if traf {
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if n.l.Level >= logrus.DebugLevel {
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hostinfo.logger(n.l).
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WithField("tunnelCheck", m{"state": "alive", "method": "passive"}).
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Debug("Tunnel status")
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}
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n.ClearLocalIndex(localIndex)
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n.ClearPendingDeletion(localIndex)
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if !mainHostInfo {
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if hostinfo.vpnIp > n.intf.myVpnIp {
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// We are receiving traffic on the non primary hostinfo and we really just want 1 tunnel. Make
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// This the primary and prime the old primary hostinfo for testing
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n.hostMap.MakePrimary(hostinfo)
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n.Out(primary.localIndexId)
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} else {
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// This hostinfo is still being used despite not being the primary hostinfo for this vpn ip
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// Keep tracking so that we can tear it down when it goes away
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n.Out(hostinfo.localIndexId)
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}
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}
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continue
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}
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if n.intf.lightHouse.IsLighthouseIP(hostinfo.vpnIp) {
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// Don't probe lighthouses since recv_error should naturally catch this.
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n.ClearLocalIndex(localIndex)
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n.ClearPendingDeletion(localIndex)
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continue
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}
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hostinfo.logger(n.l).
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WithField("tunnelCheck", m{"state": "testing", "method": "active"}).
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Debug("Tunnel status")
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if hostinfo != nil && hostinfo.ConnectionState != nil && mainHostInfo {
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// Send a test packet to trigger an authenticated tunnel test, this should suss out any lingering tunnel issues
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n.intf.sendMessageToVpnIp(header.Test, header.TestRequest, hostinfo, p, nb, out)
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} else {
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hostinfo.logger(n.l).Debugf("Hostinfo sadness")
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}
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n.AddPendingDeletion(localIndex)
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}
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}
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func (n *connectionManager) HandleDeletionTick(now time.Time) {
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n.pendingDeletionTimer.Advance(now)
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for {
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localIndex, has := n.pendingDeletionTimer.Purge()
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if !has {
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break
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}
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hostinfo, mainHostInfo, err := n.hostMap.QueryIndexIsPrimary(localIndex)
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if err != nil {
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n.l.WithField("localIndex", localIndex).Debugf("Not found in hostmap")
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n.ClearLocalIndex(localIndex)
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n.ClearPendingDeletion(localIndex)
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continue
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}
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if n.handleInvalidCertificate(now, hostinfo) {
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continue
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}
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// If we saw an incoming packets from this ip and peer's certificate is not
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// expired, just ignore.
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traf := n.CheckIn(localIndex)
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if traf {
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hostinfo.logger(n.l).
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WithField("tunnelCheck", m{"state": "alive", "method": "active"}).
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Debug("Tunnel status")
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n.ClearLocalIndex(localIndex)
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n.ClearPendingDeletion(localIndex)
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if !mainHostInfo {
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// This hostinfo is still being used despite not being the primary hostinfo for this vpn ip
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// Keep tracking so that we can tear it down when it goes away
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n.Out(localIndex)
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}
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continue
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}
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// If it comes around on deletion wheel and hasn't resolved itself, delete
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if n.checkPendingDeletion(localIndex) {
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cn := ""
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if hostinfo.ConnectionState != nil && hostinfo.ConnectionState.peerCert != nil {
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cn = hostinfo.ConnectionState.peerCert.Details.Name
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}
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hostinfo.logger(n.l).
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WithField("tunnelCheck", m{"state": "dead", "method": "active"}).
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WithField("certName", cn).
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Info("Tunnel status")
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n.hostMap.DeleteHostInfo(hostinfo)
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}
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n.ClearLocalIndex(localIndex)
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n.ClearPendingDeletion(localIndex)
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}
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}
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// handleInvalidCertificates will destroy a tunnel if pki.disconnect_invalid is true and the certificate is no longer valid
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func (n *connectionManager) handleInvalidCertificate(now time.Time, hostinfo *HostInfo) bool {
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if !n.intf.disconnectInvalid {
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return false
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}
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remoteCert := hostinfo.GetCert()
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if remoteCert == nil {
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return false
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}
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valid, err := remoteCert.Verify(now, n.intf.caPool)
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if valid {
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return false
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}
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fingerprint, _ := remoteCert.Sha256Sum()
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hostinfo.logger(n.l).WithError(err).
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WithField("fingerprint", fingerprint).
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Info("Remote certificate is no longer valid, tearing down the tunnel")
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// Inform the remote and close the tunnel locally
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n.intf.sendCloseTunnel(hostinfo)
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n.intf.closeTunnel(hostinfo)
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n.ClearLocalIndex(hostinfo.localIndexId)
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n.ClearPendingDeletion(hostinfo.localIndexId)
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return true
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}
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