Public Release
This commit is contained in:
Slack Security Team
201
inside.go
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201
inside.go
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package nebula
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import (
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"sync/atomic"
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"github.com/flynn/noise"
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"github.com/sirupsen/logrus"
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)
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func (f *Interface) consumeInsidePacket(packet []byte, fwPacket *FirewallPacket, nb, out []byte) {
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err := newPacket(packet, false, fwPacket)
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if err != nil {
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l.WithField("packet", packet).Debugf("Error while validating outbound packet: %s", err)
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return
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}
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// Ignore local broadcast packets
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if f.dropLocalBroadcast && fwPacket.RemoteIP == f.localBroadcast {
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return
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}
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// Ignore broadcast packets
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if f.dropMulticast && isMulticast(fwPacket.RemoteIP) {
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return
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}
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hostinfo := f.getOrHandshake(fwPacket.RemoteIP)
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ci := hostinfo.ConnectionState
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if ci.ready == false {
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// Because we might be sending stored packets, lock here to stop new things going to
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// the packet queue.
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ci.queueLock.Lock()
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if !ci.ready {
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hostinfo.cachePacket(message, 0, packet, f.sendMessageNow)
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ci.queueLock.Unlock()
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return
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}
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ci.queueLock.Unlock()
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}
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if !f.firewall.Drop(packet, *fwPacket, false, ci.peerCert, trustedCAs) {
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f.send(message, 0, ci, hostinfo, hostinfo.remote, packet, nb, out)
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if f.lightHouse != nil && *ci.messageCounter%5000 == 0 {
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f.lightHouse.Query(fwPacket.RemoteIP, f)
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}
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} else if l.Level >= logrus.DebugLevel {
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l.WithField("vpnIp", IntIp(hostinfo.hostId)).WithField("fwPacket", fwPacket).
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Debugln("dropping outbound packet")
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}
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}
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func (f *Interface) getOrHandshake(vpnIp uint32) *HostInfo {
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hostinfo, err := f.hostMap.PromoteBestQueryVpnIP(vpnIp, f)
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//if err != nil || hostinfo.ConnectionState == nil {
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if err != nil {
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hostinfo, err = f.handshakeManager.pendingHostMap.QueryVpnIP(vpnIp)
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if err != nil {
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hostinfo = f.handshakeManager.AddVpnIP(vpnIp)
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}
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}
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ci := hostinfo.ConnectionState
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if ci != nil && ci.eKey != nil && ci.ready {
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return hostinfo
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}
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if ci == nil {
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// if we don't have a connection state, then send a handshake initiation
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ci = f.newConnectionState(true, noise.HandshakeIX, []byte{}, 0)
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// FIXME: Maybe make XX selectable, but probably not since psk makes it nearly pointless for us.
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//ci = f.newConnectionState(true, noise.HandshakeXX, []byte{}, 0)
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hostinfo.ConnectionState = ci
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} else if ci.eKey == nil {
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// if we don't have any state at all, create it
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}
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// If we have already created the handshake packet, we don't want to call the function at all.
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if !hostinfo.HandshakeReady {
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ixHandshakeStage0(f, vpnIp, hostinfo)
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// FIXME: Maybe make XX selectable, but probably not since psk makes it nearly pointless for us.
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//xx_handshakeStage0(f, ip, hostinfo)
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}
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return hostinfo
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}
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func (f *Interface) sendMessageNow(t NebulaMessageType, st NebulaMessageSubType, hostInfo *HostInfo, p, nb, out []byte) {
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fp := &FirewallPacket{}
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err := newPacket(p, false, fp)
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if err != nil {
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l.Warnf("error while parsing outgoing packet for firewall check; %v", err)
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return
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}
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// check if packet is in outbound fw rules
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if f.firewall.Drop(p, *fp, false, hostInfo.ConnectionState.peerCert, trustedCAs) {
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l.WithField("fwPacket", fp).Debugln("dropping cached packet")
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return
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}
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f.send(message, st, hostInfo.ConnectionState, hostInfo, hostInfo.remote, p, nb, out)
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if f.lightHouse != nil && *hostInfo.ConnectionState.messageCounter%5000 == 0 {
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f.lightHouse.Query(fp.RemoteIP, f)
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}
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}
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// SendMessageToVpnIp handles real ip:port lookup and sends to the current best known address for vpnIp
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func (f *Interface) SendMessageToVpnIp(t NebulaMessageType, st NebulaMessageSubType, vpnIp uint32, p, nb, out []byte) {
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hostInfo := f.getOrHandshake(vpnIp)
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if !hostInfo.ConnectionState.ready {
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// Because we might be sending stored packets, lock here to stop new things going to
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// the packet queue.
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hostInfo.ConnectionState.queueLock.Lock()
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if !hostInfo.ConnectionState.ready {
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hostInfo.cachePacket(t, st, p, f.sendMessageToVpnIp)
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hostInfo.ConnectionState.queueLock.Unlock()
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return
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}
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hostInfo.ConnectionState.queueLock.Unlock()
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}
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f.sendMessageToVpnIp(t, st, hostInfo, p, nb, out)
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return
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}
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func (f *Interface) sendMessageToVpnIp(t NebulaMessageType, st NebulaMessageSubType, hostInfo *HostInfo, p, nb, out []byte) {
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f.send(t, st, hostInfo.ConnectionState, hostInfo, hostInfo.remote, p, nb, out)
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}
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// SendMessageToAll handles real ip:port lookup and sends to all known addresses for vpnIp
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func (f *Interface) SendMessageToAll(t NebulaMessageType, st NebulaMessageSubType, vpnIp uint32, p, nb, out []byte) {
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hostInfo := f.getOrHandshake(vpnIp)
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if hostInfo.ConnectionState.ready == false {
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// Because we might be sending stored packets, lock here to stop new things going to
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// the packet queue.
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hostInfo.ConnectionState.queueLock.Lock()
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if !hostInfo.ConnectionState.ready {
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hostInfo.cachePacket(t, st, p, f.sendMessageToAll)
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hostInfo.ConnectionState.queueLock.Unlock()
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return
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}
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hostInfo.ConnectionState.queueLock.Unlock()
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}
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f.sendMessageToAll(t, st, hostInfo, p, nb, out)
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return
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}
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func (f *Interface) sendMessageToAll(t NebulaMessageType, st NebulaMessageSubType, hostInfo *HostInfo, p, nb, b []byte) {
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for _, r := range hostInfo.RemoteUDPAddrs() {
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f.send(t, st, hostInfo.ConnectionState, hostInfo, r, p, nb, b)
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}
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}
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func (f *Interface) send(t NebulaMessageType, st NebulaMessageSubType, ci *ConnectionState, hostinfo *HostInfo, remote *udpAddr, p, nb, out []byte) {
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if ci.eKey == nil {
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//TODO: log warning
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return
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}
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var err error
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//TODO: enable if we do more than 1 tun queue
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//ci.writeLock.Lock()
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c := atomic.AddUint64(ci.messageCounter, 1)
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//l.WithField("trace", string(debug.Stack())).Error("out Header ", &Header{Version, t, st, 0, hostinfo.remoteIndexId, c}, p)
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out = HeaderEncode(out, Version, uint8(t), uint8(st), hostinfo.remoteIndexId, c)
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f.connectionManager.Out(hostinfo.hostId)
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out, err = ci.eKey.EncryptDanger(out, out, p, c, nb)
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//TODO: see above note on lock
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//ci.writeLock.Unlock()
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if err != nil {
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l.WithError(err).WithField("vpnIp", IntIp(hostinfo.hostId)).
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WithField("udpAddr", remote).WithField("counter", c).
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WithField("attemptedCounter", ci.messageCounter).
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Error("Failed to encrypt outgoing packet")
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return
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}
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err = f.outside.WriteTo(out, remote)
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if err != nil {
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l.WithError(err).WithField("vpnIp", IntIp(hostinfo.hostId)).
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WithField("udpAddr", remote).Error("Failed to write outgoing packet")
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}
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}
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func isMulticast(ip uint32) bool {
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// Class D multicast
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if (((ip >> 24) & 0xff) & 0xf0) == 0xe0 {
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return true
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}
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return false
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}
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