Public Release
This commit is contained in:
Slack Security Team
253
connection_manager.go
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253
connection_manager.go
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@ -0,0 +1,253 @@
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package nebula
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import (
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"github.com/sirupsen/logrus"
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"sync"
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"time"
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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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inCount int
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out map[uint32]struct{}
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outLock *sync.RWMutex
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outCount int
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TrafficTimer *SystemTimerWheel
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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 *SystemTimerWheel
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checkInterval int
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pendingDeletionInterval int
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// I wanted to call one matLock
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}
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func newConnectionManager(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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inCount: 0,
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out: make(map[uint32]struct{}),
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outLock: &sync.RWMutex{},
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outCount: 0,
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TrafficTimer: NewSystemTimerWheel(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: NewSystemTimerWheel(time.Millisecond*500, time.Second*60),
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checkInterval: checkInterval,
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pendingDeletionInterval: pendingDeletionInterval,
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}
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nc.Start()
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return nc
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}
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func (n *connectionManager) In(ip 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[ip]; 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[ip] = struct{}{}
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n.inLock.Unlock()
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}
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func (n *connectionManager) Out(ip 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[ip]; 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[ip]; ok {
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n.outLock.Unlock()
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return
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}
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n.out[ip] = struct{}{}
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n.AddTrafficWatch(ip, n.checkInterval)
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n.outLock.Unlock()
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}
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func (n *connectionManager) CheckIn(vpnIP uint32) bool {
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n.inLock.RLock()
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if _, ok := n.in[vpnIP]; 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) ClearIP(ip uint32) {
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n.inLock.Lock()
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n.outLock.Lock()
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delete(n.in, ip)
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delete(n.out, ip)
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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(ip uint32) {
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n.pendingDeletionLock.Lock()
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delete(n.pendingDeletion, ip)
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n.pendingDeletionLock.Unlock()
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}
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func (n *connectionManager) AddPendingDeletion(ip uint32) {
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n.pendingDeletionLock.Lock()
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if _, ok := n.pendingDeletion[ip]; ok {
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n.pendingDeletion[ip] += 1
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} else {
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n.pendingDeletion[ip] = 0
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}
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n.pendingDeletionTimer.Add(ip, 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(ip uint32) bool {
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n.pendingDeletionLock.RLock()
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if _, ok := n.pendingDeletion[ip]; 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(vpnIP uint32, seconds int) {
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n.TrafficTimer.Add(vpnIP, time.Second*time.Duration(seconds))
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}
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func (n *connectionManager) Start() {
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go n.Run()
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}
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func (n *connectionManager) Run() {
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clockSource := time.Tick(500 * time.Millisecond)
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for now := range clockSource {
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n.HandleMonitorTick(now)
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n.HandleDeletionTick(now)
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}
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}
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func (n *connectionManager) HandleMonitorTick(now time.Time) {
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n.TrafficTimer.advance(now)
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for {
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ep := n.TrafficTimer.Purge()
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if ep == nil {
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break
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}
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vpnIP := ep.(uint32)
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// Check for traffic coming back in from this host.
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traf := n.CheckIn(vpnIP)
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// If we saw incoming packets from this ip, just return
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if traf {
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if l.Level >= logrus.DebugLevel {
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l.WithField("vpnIp", IntIp(vpnIP)).
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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.ClearIP(vpnIP)
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n.ClearPendingDeletion(vpnIP)
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continue
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}
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// If we didn't we may need to probe or destroy the conn
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hostinfo, err := n.hostMap.QueryVpnIP(vpnIP)
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if err != nil {
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l.Debugf("Not found in hostmap: %s", IntIp(vpnIP))
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n.ClearIP(vpnIP)
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n.ClearPendingDeletion(vpnIP)
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continue
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}
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l.WithField("vpnIp", IntIp(vpnIP)).
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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 {
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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(test, testRequest, vpnIP, []byte(""), make([]byte, 12, 12), make([]byte, mtu))
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} else {
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l.Debugf("Hostinfo sadness: %s", IntIp(vpnIP))
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}
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n.AddPendingDeletion(vpnIP)
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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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ep := n.pendingDeletionTimer.Purge()
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if ep == nil {
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break
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}
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vpnIP := ep.(uint32)
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// If we saw incoming packets from this ip, just return
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traf := n.CheckIn(vpnIP)
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if traf {
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l.WithField("vpnIp", IntIp(vpnIP)).
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WithField("tunnelCheck", m{"state": "alive", "method": "active"}).
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Debug("Tunnel status")
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n.ClearIP(vpnIP)
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n.ClearPendingDeletion(vpnIP)
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continue
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}
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hostinfo, err := n.hostMap.QueryVpnIP(vpnIP)
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if err != nil {
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n.ClearIP(vpnIP)
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n.ClearPendingDeletion(vpnIP)
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l.Debugf("Not found in hostmap: %s", IntIp(vpnIP))
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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(vpnIP) {
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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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l.WithField("vpnIp", IntIp(vpnIP)).
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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.ClearIP(vpnIP)
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n.ClearPendingDeletion(vpnIP)
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// TODO: This is only here to let tests work. Should do proper mocking
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if n.intf.lightHouse != nil {
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n.intf.lightHouse.DeleteVpnIP(vpnIP)
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}
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n.hostMap.DeleteVpnIP(vpnIP)
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n.hostMap.DeleteIndex(hostinfo.localIndexId)
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} else {
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n.ClearIP(vpnIP)
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n.ClearPendingDeletion(vpnIP)
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}
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}
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}
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