mirror of https://github.com/slackhq/nebula.git
490 lines
18 KiB
Go
490 lines
18 KiB
Go
package nebula
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import (
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"time"
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"github.com/flynn/noise"
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"github.com/sirupsen/logrus"
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"github.com/slackhq/nebula/header"
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"github.com/slackhq/nebula/iputil"
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"github.com/slackhq/nebula/udp"
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)
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// NOISE IX Handshakes
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// This function constructs a handshake packet, but does not actually send it
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// Sending is done by the handshake manager
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func ixHandshakeStage0(f *Interface, hh *HandshakeHostInfo) bool {
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err := f.handshakeManager.allocateIndex(hh)
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if err != nil {
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f.l.WithError(err).WithField("vpnIp", hh.hostinfo.vpnIp).
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WithField("handshake", m{"stage": 0, "style": "ix_psk0"}).Error("Failed to generate index")
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return false
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}
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certState := f.pki.GetCertState()
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ci := NewConnectionState(f.l, f.cipher, certState, true, noise.HandshakeIX, []byte{}, 0)
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hh.hostinfo.ConnectionState = ci
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hsProto := &NebulaHandshakeDetails{
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InitiatorIndex: hh.hostinfo.localIndexId,
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Time: uint64(time.Now().UnixNano()),
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Cert: certState.RawCertificateNoKey,
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}
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hsBytes := []byte{}
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hs := &NebulaHandshake{
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Details: hsProto,
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}
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hsBytes, err = hs.Marshal()
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if err != nil {
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f.l.WithError(err).WithField("vpnIp", hh.hostinfo.vpnIp).
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WithField("handshake", m{"stage": 0, "style": "ix_psk0"}).Error("Failed to marshal handshake message")
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return false
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}
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h := header.Encode(make([]byte, header.Len), header.Version, header.Handshake, header.HandshakeIXPSK0, 0, 1)
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ci.messageCounter.Add(1)
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msg, _, _, err := ci.H.WriteMessage(h, hsBytes)
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if err != nil {
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f.l.WithError(err).WithField("vpnIp", hh.hostinfo.vpnIp).
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WithField("handshake", m{"stage": 0, "style": "ix_psk0"}).Error("Failed to call noise.WriteMessage")
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return false
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}
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// We are sending handshake packet 1, so we don't expect to receive
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// handshake packet 1 from the responder
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ci.window.Update(f.l, 1)
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hh.hostinfo.HandshakePacket[0] = msg
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hh.ready = true
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return true
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}
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func ixHandshakeStage1(f *Interface, addr *udp.Addr, via *ViaSender, packet []byte, h *header.H) {
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certState := f.pki.GetCertState()
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ci := NewConnectionState(f.l, f.cipher, certState, false, noise.HandshakeIX, []byte{}, 0)
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// Mark packet 1 as seen so it doesn't show up as missed
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ci.window.Update(f.l, 1)
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msg, _, _, err := ci.H.ReadMessage(nil, packet[header.Len:])
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if err != nil {
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f.l.WithError(err).WithField("udpAddr", addr).
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WithField("handshake", m{"stage": 1, "style": "ix_psk0"}).Error("Failed to call noise.ReadMessage")
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return
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}
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hs := &NebulaHandshake{}
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err = hs.Unmarshal(msg)
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/*
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l.Debugln("GOT INDEX: ", hs.Details.InitiatorIndex)
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*/
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if err != nil || hs.Details == nil {
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f.l.WithError(err).WithField("udpAddr", addr).
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WithField("handshake", m{"stage": 1, "style": "ix_psk0"}).Error("Failed unmarshal handshake message")
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return
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}
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remoteCert, err := RecombineCertAndValidate(ci.H, hs.Details.Cert, f.pki.GetCAPool())
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if err != nil {
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e := f.l.WithError(err).WithField("udpAddr", addr).
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WithField("handshake", m{"stage": 1, "style": "ix_psk0"})
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if f.l.Level > logrus.DebugLevel {
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e = e.WithField("cert", remoteCert)
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}
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e.Info("Invalid certificate from host")
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return
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}
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vpnIp := iputil.Ip2VpnIp(remoteCert.Details.Ips[0].IP)
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certName := remoteCert.Details.Name
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fingerprint, _ := remoteCert.Sha256Sum()
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issuer := remoteCert.Details.Issuer
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if vpnIp == f.myVpnIp {
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f.l.WithField("vpnIp", vpnIp).WithField("udpAddr", addr).
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WithField("certName", certName).
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WithField("fingerprint", fingerprint).
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WithField("issuer", issuer).
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WithField("handshake", m{"stage": 1, "style": "ix_psk0"}).Error("Refusing to handshake with myself")
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return
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}
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if addr != nil {
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if !f.lightHouse.GetRemoteAllowList().Allow(vpnIp, addr.IP) {
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f.l.WithField("vpnIp", vpnIp).WithField("udpAddr", addr).Debug("lighthouse.remote_allow_list denied incoming handshake")
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return
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}
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}
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myIndex, err := generateIndex(f.l)
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if err != nil {
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f.l.WithError(err).WithField("vpnIp", vpnIp).WithField("udpAddr", addr).
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WithField("certName", certName).
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WithField("fingerprint", fingerprint).
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WithField("issuer", issuer).
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WithField("handshake", m{"stage": 1, "style": "ix_psk0"}).Error("Failed to generate index")
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return
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}
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hostinfo := &HostInfo{
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ConnectionState: ci,
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localIndexId: myIndex,
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remoteIndexId: hs.Details.InitiatorIndex,
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vpnIp: vpnIp,
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HandshakePacket: make(map[uint8][]byte, 0),
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lastHandshakeTime: hs.Details.Time,
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relayState: RelayState{
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relays: map[iputil.VpnIp]struct{}{},
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relayForByIp: map[iputil.VpnIp]*Relay{},
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relayForByIdx: map[uint32]*Relay{},
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},
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}
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f.l.WithField("vpnIp", vpnIp).WithField("udpAddr", addr).
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WithField("certName", certName).
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WithField("fingerprint", fingerprint).
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WithField("issuer", issuer).
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WithField("initiatorIndex", hs.Details.InitiatorIndex).WithField("responderIndex", hs.Details.ResponderIndex).
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WithField("remoteIndex", h.RemoteIndex).WithField("handshake", m{"stage": 1, "style": "ix_psk0"}).
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Info("Handshake message received")
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hs.Details.ResponderIndex = myIndex
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hs.Details.Cert = certState.RawCertificateNoKey
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// Update the time in case their clock is way off from ours
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hs.Details.Time = uint64(time.Now().UnixNano())
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hsBytes, err := hs.Marshal()
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if err != nil {
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f.l.WithError(err).WithField("vpnIp", hostinfo.vpnIp).WithField("udpAddr", addr).
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WithField("certName", certName).
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WithField("fingerprint", fingerprint).
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WithField("issuer", issuer).
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WithField("handshake", m{"stage": 1, "style": "ix_psk0"}).Error("Failed to marshal handshake message")
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return
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}
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nh := header.Encode(make([]byte, header.Len), header.Version, header.Handshake, header.HandshakeIXPSK0, hs.Details.InitiatorIndex, 2)
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msg, dKey, eKey, err := ci.H.WriteMessage(nh, hsBytes)
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if err != nil {
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f.l.WithError(err).WithField("vpnIp", hostinfo.vpnIp).WithField("udpAddr", addr).
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WithField("certName", certName).
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WithField("fingerprint", fingerprint).
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WithField("issuer", issuer).
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WithField("handshake", m{"stage": 1, "style": "ix_psk0"}).Error("Failed to call noise.WriteMessage")
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return
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} else if dKey == nil || eKey == nil {
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f.l.WithField("vpnIp", hostinfo.vpnIp).WithField("udpAddr", addr).
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WithField("certName", certName).
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WithField("fingerprint", fingerprint).
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WithField("issuer", issuer).
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WithField("handshake", m{"stage": 1, "style": "ix_psk0"}).Error("Noise did not arrive at a key")
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return
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}
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hostinfo.HandshakePacket[0] = make([]byte, len(packet[header.Len:]))
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copy(hostinfo.HandshakePacket[0], packet[header.Len:])
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// Regardless of whether you are the sender or receiver, you should arrive here
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// and complete standing up the connection.
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hostinfo.HandshakePacket[2] = make([]byte, len(msg))
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copy(hostinfo.HandshakePacket[2], msg)
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// We are sending handshake packet 2, so we don't expect to receive
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// handshake packet 2 from the initiator.
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ci.window.Update(f.l, 2)
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ci.peerCert = remoteCert
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ci.dKey = NewNebulaCipherState(dKey)
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ci.eKey = NewNebulaCipherState(eKey)
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hostinfo.remotes = f.lightHouse.QueryCache(vpnIp)
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hostinfo.SetRemote(addr)
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hostinfo.CreateRemoteCIDR(remoteCert)
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existing, err := f.handshakeManager.CheckAndComplete(hostinfo, 0, f)
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if err != nil {
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switch err {
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case ErrAlreadySeen:
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// Update remote if preferred
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if existing.SetRemoteIfPreferred(f.hostMap, addr) {
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// Send a test packet to ensure the other side has also switched to
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// the preferred remote
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f.SendMessageToVpnIp(header.Test, header.TestRequest, vpnIp, []byte(""), make([]byte, 12, 12), make([]byte, mtu))
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}
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msg = existing.HandshakePacket[2]
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f.messageMetrics.Tx(header.Handshake, header.MessageSubType(msg[1]), 1)
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if addr != nil {
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err := f.outside.WriteTo(msg, addr)
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if err != nil {
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f.l.WithField("vpnIp", existing.vpnIp).WithField("udpAddr", addr).
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WithField("handshake", m{"stage": 2, "style": "ix_psk0"}).WithField("cached", true).
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WithError(err).Error("Failed to send handshake message")
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} else {
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f.l.WithField("vpnIp", existing.vpnIp).WithField("udpAddr", addr).
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WithField("handshake", m{"stage": 2, "style": "ix_psk0"}).WithField("cached", true).
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Info("Handshake message sent")
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}
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return
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} else {
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if via == nil {
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f.l.Error("Handshake send failed: both addr and via are nil.")
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return
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}
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hostinfo.relayState.InsertRelayTo(via.relayHI.vpnIp)
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f.SendVia(via.relayHI, via.relay, msg, make([]byte, 12), make([]byte, mtu), false)
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f.l.WithField("vpnIp", existing.vpnIp).WithField("relay", via.relayHI.vpnIp).
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WithField("handshake", m{"stage": 2, "style": "ix_psk0"}).WithField("cached", true).
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Info("Handshake message sent")
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return
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}
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case ErrExistingHostInfo:
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// This means there was an existing tunnel and this handshake was older than the one we are currently based on
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f.l.WithField("vpnIp", vpnIp).WithField("udpAddr", addr).
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WithField("certName", certName).
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WithField("oldHandshakeTime", existing.lastHandshakeTime).
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WithField("newHandshakeTime", hostinfo.lastHandshakeTime).
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WithField("fingerprint", fingerprint).
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WithField("issuer", issuer).
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WithField("initiatorIndex", hs.Details.InitiatorIndex).WithField("responderIndex", hs.Details.ResponderIndex).
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WithField("remoteIndex", h.RemoteIndex).WithField("handshake", m{"stage": 1, "style": "ix_psk0"}).
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Info("Handshake too old")
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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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f.SendMessageToVpnIp(header.Test, header.TestRequest, vpnIp, []byte(""), make([]byte, 12, 12), make([]byte, mtu))
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return
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case ErrLocalIndexCollision:
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// This means we failed to insert because of collision on localIndexId. Just let the next handshake packet retry
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f.l.WithField("vpnIp", vpnIp).WithField("udpAddr", addr).
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WithField("certName", certName).
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WithField("fingerprint", fingerprint).
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WithField("issuer", issuer).
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WithField("initiatorIndex", hs.Details.InitiatorIndex).WithField("responderIndex", hs.Details.ResponderIndex).
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WithField("remoteIndex", h.RemoteIndex).WithField("handshake", m{"stage": 1, "style": "ix_psk0"}).
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WithField("localIndex", hostinfo.localIndexId).WithField("collision", existing.vpnIp).
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Error("Failed to add HostInfo due to localIndex collision")
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return
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default:
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// Shouldn't happen, but just in case someone adds a new error type to CheckAndComplete
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// And we forget to update it here
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f.l.WithError(err).WithField("vpnIp", vpnIp).WithField("udpAddr", addr).
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WithField("certName", certName).
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WithField("fingerprint", fingerprint).
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WithField("issuer", issuer).
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WithField("initiatorIndex", hs.Details.InitiatorIndex).WithField("responderIndex", hs.Details.ResponderIndex).
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WithField("remoteIndex", h.RemoteIndex).WithField("handshake", m{"stage": 1, "style": "ix_psk0"}).
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Error("Failed to add HostInfo to HostMap")
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return
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}
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}
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// Do the send
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f.messageMetrics.Tx(header.Handshake, header.MessageSubType(msg[1]), 1)
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if addr != nil {
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err = f.outside.WriteTo(msg, addr)
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if err != nil {
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f.l.WithField("vpnIp", vpnIp).WithField("udpAddr", addr).
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WithField("certName", certName).
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WithField("fingerprint", fingerprint).
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WithField("issuer", issuer).
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WithField("initiatorIndex", hs.Details.InitiatorIndex).WithField("responderIndex", hs.Details.ResponderIndex).
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WithField("remoteIndex", h.RemoteIndex).WithField("handshake", m{"stage": 2, "style": "ix_psk0"}).
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WithError(err).Error("Failed to send handshake")
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} else {
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f.l.WithField("vpnIp", vpnIp).WithField("udpAddr", addr).
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WithField("certName", certName).
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WithField("fingerprint", fingerprint).
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WithField("issuer", issuer).
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WithField("initiatorIndex", hs.Details.InitiatorIndex).WithField("responderIndex", hs.Details.ResponderIndex).
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WithField("remoteIndex", h.RemoteIndex).WithField("handshake", m{"stage": 2, "style": "ix_psk0"}).
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Info("Handshake message sent")
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}
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} else {
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if via == nil {
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f.l.Error("Handshake send failed: both addr and via are nil.")
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return
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}
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hostinfo.relayState.InsertRelayTo(via.relayHI.vpnIp)
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f.SendVia(via.relayHI, via.relay, msg, make([]byte, 12), make([]byte, mtu), false)
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f.l.WithField("vpnIp", vpnIp).WithField("relay", via.relayHI.vpnIp).
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WithField("certName", certName).
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WithField("fingerprint", fingerprint).
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WithField("issuer", issuer).
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WithField("initiatorIndex", hs.Details.InitiatorIndex).WithField("responderIndex", hs.Details.ResponderIndex).
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WithField("remoteIndex", h.RemoteIndex).WithField("handshake", m{"stage": 2, "style": "ix_psk0"}).
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Info("Handshake message sent")
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}
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f.connectionManager.AddTrafficWatch(hostinfo.localIndexId)
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hostinfo.ConnectionState.messageCounter.Store(2)
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hostinfo.remotes.ResetBlockedRemotes()
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return
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}
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func ixHandshakeStage2(f *Interface, addr *udp.Addr, via *ViaSender, hh *HandshakeHostInfo, packet []byte, h *header.H) bool {
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if hh == nil {
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// Nothing here to tear down, got a bogus stage 2 packet
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return true
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}
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hh.Lock()
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defer hh.Unlock()
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hostinfo := hh.hostinfo
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if addr != nil {
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if !f.lightHouse.GetRemoteAllowList().Allow(hostinfo.vpnIp, addr.IP) {
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f.l.WithField("vpnIp", hostinfo.vpnIp).WithField("udpAddr", addr).Debug("lighthouse.remote_allow_list denied incoming handshake")
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return false
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}
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}
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ci := hostinfo.ConnectionState
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msg, eKey, dKey, err := ci.H.ReadMessage(nil, packet[header.Len:])
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if err != nil {
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f.l.WithError(err).WithField("vpnIp", hostinfo.vpnIp).WithField("udpAddr", addr).
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WithField("handshake", m{"stage": 2, "style": "ix_psk0"}).WithField("header", h).
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Error("Failed to call noise.ReadMessage")
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// We don't want to tear down the connection on a bad ReadMessage because it could be an attacker trying
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// to DOS us. Every other error condition after should to allow a possible good handshake to complete in the
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// near future
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return false
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} else if dKey == nil || eKey == nil {
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f.l.WithField("vpnIp", hostinfo.vpnIp).WithField("udpAddr", addr).
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WithField("handshake", m{"stage": 2, "style": "ix_psk0"}).
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Error("Noise did not arrive at a key")
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// This should be impossible in IX but just in case, if we get here then there is no chance to recover
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// the handshake state machine. Tear it down
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return true
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}
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hs := &NebulaHandshake{}
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err = hs.Unmarshal(msg)
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if err != nil || hs.Details == nil {
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f.l.WithError(err).WithField("vpnIp", hostinfo.vpnIp).WithField("udpAddr", addr).
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WithField("handshake", m{"stage": 2, "style": "ix_psk0"}).Error("Failed unmarshal handshake message")
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// The handshake state machine is complete, if things break now there is no chance to recover. Tear down and start again
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return true
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}
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remoteCert, err := RecombineCertAndValidate(ci.H, hs.Details.Cert, f.pki.GetCAPool())
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if err != nil {
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e := f.l.WithError(err).WithField("vpnIp", hostinfo.vpnIp).WithField("udpAddr", addr).
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WithField("handshake", m{"stage": 2, "style": "ix_psk0"})
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if f.l.Level > logrus.DebugLevel {
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e = e.WithField("cert", remoteCert)
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}
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e.Error("Invalid certificate from host")
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// The handshake state machine is complete, if things break now there is no chance to recover. Tear down and start again
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return true
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}
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vpnIp := iputil.Ip2VpnIp(remoteCert.Details.Ips[0].IP)
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certName := remoteCert.Details.Name
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fingerprint, _ := remoteCert.Sha256Sum()
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issuer := remoteCert.Details.Issuer
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// Ensure the right host responded
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if vpnIp != hostinfo.vpnIp {
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f.l.WithField("intendedVpnIp", hostinfo.vpnIp).WithField("haveVpnIp", vpnIp).
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WithField("udpAddr", addr).WithField("certName", certName).
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WithField("handshake", m{"stage": 2, "style": "ix_psk0"}).
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Info("Incorrect host responded to handshake")
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// Release our old handshake from pending, it should not continue
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f.handshakeManager.DeleteHostInfo(hostinfo)
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// Create a new hostinfo/handshake for the intended vpn ip
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f.handshakeManager.StartHandshake(hostinfo.vpnIp, func(newHH *HandshakeHostInfo) {
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//TODO: this doesnt know if its being added or is being used for caching a packet
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// Block the current used address
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newHH.hostinfo.remotes = hostinfo.remotes
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newHH.hostinfo.remotes.BlockRemote(addr)
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// Get the correct remote list for the host we did handshake with
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hostinfo.remotes = f.lightHouse.QueryCache(vpnIp)
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f.l.WithField("blockedUdpAddrs", newHH.hostinfo.remotes.CopyBlockedRemotes()).WithField("vpnIp", vpnIp).
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WithField("remotes", newHH.hostinfo.remotes.CopyAddrs(f.hostMap.GetPreferredRanges())).
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Info("Blocked addresses for handshakes")
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|
|
|
// Swap the packet store to benefit the original intended recipient
|
|
newHH.packetStore = hh.packetStore
|
|
hh.packetStore = []*cachedPacket{}
|
|
|
|
// Finally, put the correct vpn ip in the host info, tell them to close the tunnel, and return true to tear down
|
|
hostinfo.vpnIp = vpnIp
|
|
f.sendCloseTunnel(hostinfo)
|
|
})
|
|
|
|
return true
|
|
}
|
|
|
|
// Mark packet 2 as seen so it doesn't show up as missed
|
|
ci.window.Update(f.l, 2)
|
|
|
|
duration := time.Since(hh.startTime).Nanoseconds()
|
|
f.l.WithField("vpnIp", vpnIp).WithField("udpAddr", addr).
|
|
WithField("certName", certName).
|
|
WithField("fingerprint", fingerprint).
|
|
WithField("issuer", issuer).
|
|
WithField("initiatorIndex", hs.Details.InitiatorIndex).WithField("responderIndex", hs.Details.ResponderIndex).
|
|
WithField("remoteIndex", h.RemoteIndex).WithField("handshake", m{"stage": 2, "style": "ix_psk0"}).
|
|
WithField("durationNs", duration).
|
|
WithField("sentCachedPackets", len(hh.packetStore)).
|
|
Info("Handshake message received")
|
|
|
|
hostinfo.remoteIndexId = hs.Details.ResponderIndex
|
|
hostinfo.lastHandshakeTime = hs.Details.Time
|
|
|
|
// Store their cert and our symmetric keys
|
|
ci.peerCert = remoteCert
|
|
ci.dKey = NewNebulaCipherState(dKey)
|
|
ci.eKey = NewNebulaCipherState(eKey)
|
|
|
|
// Make sure the current udpAddr being used is set for responding
|
|
if addr != nil {
|
|
hostinfo.SetRemote(addr)
|
|
} else {
|
|
hostinfo.relayState.InsertRelayTo(via.relayHI.vpnIp)
|
|
}
|
|
|
|
// Build up the radix for the firewall if we have subnets in the cert
|
|
hostinfo.CreateRemoteCIDR(remoteCert)
|
|
|
|
// Complete our handshake and update metrics, this will replace any existing tunnels for this vpnIp
|
|
f.handshakeManager.Complete(hostinfo, f)
|
|
f.connectionManager.AddTrafficWatch(hostinfo.localIndexId)
|
|
|
|
hostinfo.ConnectionState.messageCounter.Store(2)
|
|
|
|
if f.l.Level >= logrus.DebugLevel {
|
|
hostinfo.logger(f.l).Debugf("Sending %d stored packets", len(hh.packetStore))
|
|
}
|
|
|
|
if len(hh.packetStore) > 0 {
|
|
nb := make([]byte, 12, 12)
|
|
out := make([]byte, mtu)
|
|
for _, cp := range hh.packetStore {
|
|
cp.callback(cp.messageType, cp.messageSubType, hostinfo, cp.packet, nb, out)
|
|
}
|
|
f.cachedPacketMetrics.sent.Inc(int64(len(hh.packetStore)))
|
|
}
|
|
|
|
hostinfo.remotes.ResetBlockedRemotes()
|
|
f.metricHandshakes.Update(duration)
|
|
|
|
return false
|
|
}
|