Number of fixes in response to code review
This version cannot complete a handshake. The program will panic upon receiving any message on the UDP socket.
This commit is contained in:
Mathias Hall-Andersen
parent
8c34c4cbb3
commit
cba1d6585a
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@ -84,13 +84,47 @@ func ipcGetOperation(device *Device, socket *bufio.ReadWriter) *IPCError {
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return nil
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}
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func updateUDPConn(device *Device) error {
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var err error
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netc := &device.net
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netc.mutex.Lock()
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// close existing connection
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if netc.conn != nil {
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netc.conn.Close()
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netc.conn = nil
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}
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// open new existing connection
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conn, err := net.ListenUDP("udp", netc.addr)
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if err == nil {
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netc.conn = conn
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signalSend(device.signal.newUDPConn)
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}
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netc.mutex.Unlock()
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return err
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}
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func closeUDPConn(device *Device) {
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device.net.mutex.Lock()
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device.net.conn = nil
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device.net.mutex.Unlock()
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println("send signal")
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signalSend(device.signal.newUDPConn)
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}
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func ipcSetOperation(device *Device, socket *bufio.ReadWriter) *IPCError {
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scanner := bufio.NewScanner(socket)
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logInfo := device.log.Info
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logError := device.log.Error
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logDebug := device.log.Debug
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var peer *Peer
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dummy := false
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deviceConfig := true
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for scanner.Scan() {
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@ -135,17 +169,11 @@ func ipcSetOperation(device *Device, socket *bufio.ReadWriter) *IPCError {
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netc := &device.net
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netc.mutex.Lock()
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if netc.addr.Port != int(port) {
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if netc.conn != nil {
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netc.conn.Close()
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}
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netc.addr.Port = int(port)
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netc.conn, err = net.ListenUDP("udp", netc.addr)
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}
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netc.mutex.Unlock()
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if err != nil {
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logError.Println("Failed to create UDP listener:", err)
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return &IPCError{Code: ipcErrorIO}
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}
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updateUDPConn(device)
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// TODO: Clear source address of all peers
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case "fwmark":
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@ -189,17 +217,30 @@ func ipcSetOperation(device *Device, socket *bufio.ReadWriter) *IPCError {
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device.mutex.RLock()
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if device.publicKey.Equals(pubKey) {
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// create dummy instance
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peer = &Peer{}
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dummy = true
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device.mutex.RUnlock()
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logError.Println("Public key of peer matches private key of device")
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return &IPCError{Code: ipcErrorInvalid}
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}
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logInfo.Println("Ignoring peer with public key of device")
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} else {
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// find peer referenced
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peer, _ = device.peers[pubKey]
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device.mutex.RUnlock()
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if peer == nil {
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peer = device.NewPeer(pubKey)
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peer, err = device.NewPeer(pubKey)
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if err != nil {
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logError.Println("Failed to create new peer:", err)
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return &IPCError{Code: ipcErrorInvalid}
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}
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}
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signalSend(peer.signal.handshakeReset)
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dummy = false
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}
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case "remove":
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@ -207,16 +248,17 @@ func ipcSetOperation(device *Device, socket *bufio.ReadWriter) *IPCError {
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logError.Println("Failed to set remove, invalid value:", value)
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return &IPCError{Code: ipcErrorInvalid}
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}
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device.RemovePeer(peer.handshake.remoteStatic)
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if !dummy {
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logDebug.Println("Removing", peer.String())
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peer = nil
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device.RemovePeer(peer.handshake.remoteStatic)
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}
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peer = &Peer{}
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dummy = true
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case "preshared_key":
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err := func() error {
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peer.mutex.Lock()
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defer peer.mutex.Unlock()
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return peer.handshake.presharedKey.FromHex(value)
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}()
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err := peer.handshake.presharedKey.FromHex(value)
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peer.mutex.Unlock()
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if err != nil {
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logError.Println("Failed to set preshared_key:", err)
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return &IPCError{Code: ipcErrorInvalid}
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@ -232,6 +274,7 @@ func ipcSetOperation(device *Device, socket *bufio.ReadWriter) *IPCError {
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peer.mutex.Lock()
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peer.endpoint = addr
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peer.mutex.Unlock()
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signalSend(peer.signal.handshakeReset)
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case "persistent_keepalive_interval":
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@ -251,12 +294,11 @@ func ipcSetOperation(device *Device, socket *bufio.ReadWriter) *IPCError {
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// send immediate keep-alive
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if old == 0 && secs != 0 {
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up, err := device.tun.IsUp()
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if err != nil {
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logError.Println("Failed to get tun device status:", err)
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return &IPCError{Code: ipcErrorIO}
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}
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if up {
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if atomic.LoadInt32(&device.isUp) == AtomicTrue && !dummy {
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peer.SendKeepAlive()
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}
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}
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@ -266,7 +308,9 @@ func ipcSetOperation(device *Device, socket *bufio.ReadWriter) *IPCError {
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logError.Println("Failed to set replace_allowed_ips, invalid value:", value)
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return &IPCError{Code: ipcErrorInvalid}
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}
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if !dummy {
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device.routingTable.RemovePeer(peer)
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}
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case "allowed_ip":
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_, network, err := net.ParseCIDR(value)
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@ -275,7 +319,9 @@ func ipcSetOperation(device *Device, socket *bufio.ReadWriter) *IPCError {
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return &IPCError{Code: ipcErrorInvalid}
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}
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ones, _ := network.Mask.Size()
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if !dummy {
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device.routingTable.Insert(network.IP, uint(ones), peer)
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}
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default:
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logError.Println("Invalid UAPI key (peer configuration):", key)
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@ -15,7 +15,6 @@ const (
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RejectAfterTime = time.Second * 180
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KeepaliveTimeout = time.Second * 10
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CookieRefreshTime = time.Second * 120
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MaxHandshakeAttemptTime = time.Second * 90
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PaddingMultiple = 16
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)
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@ -33,4 +32,5 @@ const (
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QueueHandshakeBusySize = QueueHandshakeSize / 8
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MinMessageSize = MessageTransportSize // size of keep-alive
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MaxMessageSize = ((1 << 16) - 1) + MessageTransportHeaderSize
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MaxPeers = 1 << 16
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)
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@ -7,6 +7,8 @@ import (
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/* Daemonizes the process on linux
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*
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* This is done by spawning and releasing a copy with the --foreground flag
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*
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* TODO: Use env variable to spawn in background
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*/
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func Daemonize() error {
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@ -1,13 +1,10 @@
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package main
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import (
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"errors"
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"fmt"
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"net"
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"runtime"
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"sync"
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"sync/atomic"
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"time"
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)
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type Device struct {
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@ -34,31 +31,45 @@ type Device struct {
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queue struct {
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encryption chan *QueueOutboundElement
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decryption chan *QueueInboundElement
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inbound chan *QueueInboundElement
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handshake chan QueueHandshakeElement
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}
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signal struct {
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stop chan struct{}
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stop chan struct{} // halts all go routines
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newUDPConn chan struct{} // a net.conn was set
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}
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underLoad int32 // used as an atomic bool
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isUp int32 // atomic bool: interface is up
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underLoad int32 // atomic bool: device is under load
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ratelimiter Ratelimiter
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peers map[NoisePublicKey]*Peer
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mac MACStateDevice
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}
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/* Warning:
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* The caller must hold the device mutex (write lock)
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*/
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func removePeerUnsafe(device *Device, key NoisePublicKey) {
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peer, ok := device.peers[key]
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if !ok {
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return
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}
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peer.mutex.Lock()
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device.routingTable.RemovePeer(peer)
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delete(device.peers, key)
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peer.Close()
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}
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func (device *Device) SetPrivateKey(sk NoisePrivateKey) error {
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device.mutex.Lock()
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defer device.mutex.Unlock()
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// check if public key is matching any peer
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// remove peers with matching public keys
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publicKey := sk.publicKey()
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for _, peer := range device.peers {
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for key, peer := range device.peers {
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h := &peer.handshake
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h.mutex.RLock()
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if h.remoteStatic.Equals(publicKey) {
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h.mutex.RUnlock()
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return errors.New("Private key matches public key of peer")
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removePeerUnsafe(device, key)
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}
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h.mutex.RUnlock()
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}
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@ -71,17 +82,19 @@ func (device *Device) SetPrivateKey(sk NoisePrivateKey) error {
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// do DH precomputations
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isZero := device.privateKey.IsZero()
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rmKey := device.privateKey.IsZero()
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for _, peer := range device.peers {
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for key, peer := range device.peers {
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h := &peer.handshake
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h.mutex.Lock()
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if isZero {
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if rmKey {
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h.precomputedStaticStatic = [NoisePublicKeySize]byte{}
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} else {
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h.precomputedStaticStatic = device.privateKey.sharedSecret(h.remoteStatic)
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if isZero(h.precomputedStaticStatic[:]) {
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removePeerUnsafe(device, key)
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}
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}
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fmt.Println(h.precomputedStaticStatic)
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h.mutex.Unlock()
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}
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@ -130,11 +143,11 @@ func NewDevice(tun TUNDevice, logLevel int) *Device {
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device.queue.handshake = make(chan QueueHandshakeElement, QueueHandshakeSize)
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device.queue.encryption = make(chan *QueueOutboundElement, QueueOutboundSize)
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device.queue.decryption = make(chan *QueueInboundElement, QueueInboundSize)
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device.queue.inbound = make(chan *QueueInboundElement, QueueInboundSize)
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// prepare signals
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device.signal.stop = make(chan struct{})
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device.signal.newUDPConn = make(chan struct{}, 1)
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// start workers
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@ -145,34 +158,43 @@ func NewDevice(tun TUNDevice, logLevel int) *Device {
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}
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go device.RoutineBusyMonitor()
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go device.RoutineMTUUpdater()
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go device.RoutineWriteToTUN()
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go device.RoutineReadFromTUN()
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go device.RoutineTUNEventReader()
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go device.RoutineReceiveIncomming()
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go device.ratelimiter.RoutineGarbageCollector(device.signal.stop)
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return device
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}
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func (device *Device) RoutineMTUUpdater() {
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func (device *Device) RoutineTUNEventReader() {
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events := device.tun.Events()
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logError := device.log.Error
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for ; ; time.Sleep(5 * time.Second) {
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// load updated MTU
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for event := range events {
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if event&TUNEventMTUUpdate != 0 {
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mtu, err := device.tun.MTU()
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if err != nil {
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logError.Println("Failed to load updated MTU of device:", err)
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continue
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}
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// upper bound of mtu
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} else {
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if mtu+MessageTransportSize > MaxMessageSize {
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mtu = MaxMessageSize - MessageTransportSize
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}
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atomic.StoreInt32(&device.mtu, int32(mtu))
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}
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}
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if event&TUNEventUp != 0 {
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println("handle 1")
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atomic.StoreInt32(&device.isUp, AtomicTrue)
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updateUDPConn(device)
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println("handle 2", device.net.conn)
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}
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if event&TUNEventDown != 0 {
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atomic.StoreInt32(&device.isUp, AtomicFalse)
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closeUDPConn(device)
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}
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}
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}
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func (device *Device) LookupPeer(pk NoisePublicKey) *Peer {
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@ -184,15 +206,7 @@ func (device *Device) LookupPeer(pk NoisePublicKey) *Peer {
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func (device *Device) RemovePeer(key NoisePublicKey) {
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device.mutex.Lock()
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defer device.mutex.Unlock()
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peer, ok := device.peers[key]
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if !ok {
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return
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}
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peer.mutex.Lock()
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device.routingTable.RemovePeer(peer)
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delete(device.peers, key)
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peer.Close()
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removePeerUnsafe(device, key)
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}
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func (device *Device) RemoveAllPeers() {
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@ -21,7 +21,8 @@ type MACStatePeer struct {
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mutex sync.RWMutex
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cookieSet time.Time
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cookie [blake2s.Size128]byte
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lastMAC1 [blake2s.Size128]byte // TODO: Check if set
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lastMAC1Set bool
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lastMAC1 [blake2s.Size128]byte
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keyMAC1 [blake2s.Size]byte
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keyMAC2 [blake2s.Size]byte
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}
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@ -184,6 +185,10 @@ func (device *Device) ConsumeMessageCookieReply(msg *MessageCookieReply) bool {
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state.mutex.Lock()
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defer state.mutex.Unlock()
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if !state.lastMAC1Set {
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return false
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}
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_, err := XChaCha20Poly1305Decrypt(
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cookie[:0],
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&msg.Nonce,
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@ -246,7 +251,7 @@ func (state *MACStatePeer) AddMacs(msg []byte) {
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mac.Sum(mac1[:0])
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}()
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copy(state.lastMAC1[:], mac1)
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// TODO: Set lastMac flag
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state.lastMAC1Set = true
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// set mac2
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19
src/peer.go
19
src/peer.go
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@ -9,16 +9,14 @@ import (
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"time"
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)
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const ()
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type Peer struct {
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id uint
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mutex sync.RWMutex
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endpoint *net.UDPAddr
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persistentKeepaliveInterval uint64
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keyPairs KeyPairs
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handshake Handshake
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device *Device
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endpoint *net.UDPAddr
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stats struct {
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txBytes uint64 // bytes send to peer (endpoint)
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rxBytes uint64 // bytes received from peer
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@ -34,6 +32,7 @@ type Peer struct {
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newKeyPair chan struct{} // (size 1) : a new key pair was generated
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handshakeBegin chan struct{} // (size 1) : request that a new handshake be started ("queue handshake")
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handshakeCompleted chan struct{} // (size 1) : handshake completed
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handshakeReset chan struct{} // (size 1) : reset handshake negotiation state
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flushNonceQueue chan struct{} // (size 1) : empty queued packets
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messageSend chan struct{} // (size 1) : a message was send to the peer
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messageReceived chan struct{} // (size 1) : an authenticated message was received
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@ -44,6 +43,7 @@ type Peer struct {
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keepalivePassive *time.Timer // set upon recieving messages
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newHandshake *time.Timer // begin a new handshake (after Keepalive + RekeyTimeout)
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zeroAllKeys *time.Timer // zero all key material (after RejectAfterTime*3)
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handshakeDeadline *time.Timer // Current handshake must be completed
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pendingKeepalivePassive bool
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pendingNewHandshake bool
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@ -59,7 +59,7 @@ type Peer struct {
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mac MACStatePeer
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}
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func (device *Device) NewPeer(pk NoisePublicKey) *Peer {
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func (device *Device) NewPeer(pk NoisePublicKey) (*Peer, error) {
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// create peer
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peer := new(Peer)
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@ -80,11 +80,17 @@ func (device *Device) NewPeer(pk NoisePublicKey) *Peer {
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peer.id = device.idCounter
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device.idCounter += 1
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// check if over limit
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if len(device.peers) >= MaxPeers {
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return nil, errors.New("Too many peers")
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}
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// map public key
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_, ok := device.peers[pk]
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if ok {
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panic(errors.New("bug: adding existing peer"))
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return nil, errors.New("Adding existing peer")
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}
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device.peers[pk] = peer
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device.mutex.Unlock()
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@ -108,6 +114,7 @@ func (device *Device) NewPeer(pk NoisePublicKey) *Peer {
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peer.signal.stop = make(chan struct{})
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peer.signal.newKeyPair = make(chan struct{}, 1)
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peer.signal.handshakeBegin = make(chan struct{}, 1)
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peer.signal.handshakeReset = make(chan struct{}, 1)
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peer.signal.handshakeCompleted = make(chan struct{}, 1)
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peer.signal.flushNonceQueue = make(chan struct{}, 1)
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@ -117,7 +124,7 @@ func (device *Device) NewPeer(pk NoisePublicKey) *Peer {
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go peer.RoutineSequentialSender()
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go peer.RoutineSequentialReceiver()
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return peer
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return peer, nil
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}
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func (peer *Peer) String() string {
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269
src/receive.go
269
src/receive.go
|
|
@ -111,113 +111,84 @@ func (device *Device) RoutineBusyMonitor() {
|
|||
|
||||
func (device *Device) RoutineReceiveIncomming() {
|
||||
|
||||
logInfo := device.log.Info
|
||||
logDebug := device.log.Debug
|
||||
logDebug.Println("Routine, receive incomming, started")
|
||||
|
||||
var buffer *[MaxMessageSize]byte
|
||||
for {
|
||||
|
||||
// wait for new conn
|
||||
|
||||
var conn *net.UDPConn
|
||||
|
||||
select {
|
||||
case <-device.signal.newUDPConn:
|
||||
device.net.mutex.RLock()
|
||||
conn = device.net.conn
|
||||
device.net.mutex.RUnlock()
|
||||
|
||||
case <-device.signal.stop:
|
||||
return
|
||||
}
|
||||
|
||||
if conn == nil {
|
||||
continue
|
||||
}
|
||||
|
||||
// receive datagrams until closed
|
||||
|
||||
buffer := device.GetMessageBuffer()
|
||||
|
||||
for {
|
||||
|
||||
// check if stopped
|
||||
|
||||
select {
|
||||
case <-device.signal.stop:
|
||||
return
|
||||
default:
|
||||
}
|
||||
|
||||
// read next datagram
|
||||
|
||||
if buffer == nil {
|
||||
buffer = device.GetMessageBuffer()
|
||||
size, raddr, err := conn.ReadFromUDP(buffer[:]) // TODO: This is broken
|
||||
|
||||
if err != nil {
|
||||
break
|
||||
}
|
||||
|
||||
// TODO: Take writelock to sleep
|
||||
device.net.mutex.RLock()
|
||||
conn := device.net.conn
|
||||
device.net.mutex.RUnlock()
|
||||
if conn == nil {
|
||||
time.Sleep(time.Second)
|
||||
if size < MinMessageSize {
|
||||
continue
|
||||
}
|
||||
|
||||
// TODO: Wait for new conn or message
|
||||
conn.SetReadDeadline(time.Now().Add(time.Second))
|
||||
|
||||
size, raddr, err := conn.ReadFromUDP(buffer[:])
|
||||
if err != nil || size < MinMessageSize {
|
||||
continue
|
||||
}
|
||||
|
||||
// handle packet
|
||||
// check size of packet
|
||||
|
||||
packet := buffer[:size]
|
||||
msgType := binary.LittleEndian.Uint32(packet[:4])
|
||||
|
||||
func() {
|
||||
var okay bool
|
||||
|
||||
switch msgType {
|
||||
|
||||
case MessageInitiationType, MessageResponseType:
|
||||
|
||||
// TODO: Check size early
|
||||
|
||||
// add to handshake queue
|
||||
|
||||
device.addToHandshakeQueue(
|
||||
device.queue.handshake,
|
||||
QueueHandshakeElement{
|
||||
msgType: msgType,
|
||||
buffer: buffer,
|
||||
packet: packet,
|
||||
source: raddr,
|
||||
},
|
||||
)
|
||||
buffer = nil
|
||||
|
||||
case MessageCookieReplyType:
|
||||
|
||||
// TODO: Queue all the things
|
||||
|
||||
// verify and update peer cookie state
|
||||
|
||||
if len(packet) != MessageCookieReplySize {
|
||||
return
|
||||
}
|
||||
|
||||
var reply MessageCookieReply
|
||||
reader := bytes.NewReader(packet)
|
||||
err := binary.Read(reader, binary.LittleEndian, &reply)
|
||||
if err != nil {
|
||||
logDebug.Println("Failed to decode cookie reply")
|
||||
return
|
||||
}
|
||||
device.ConsumeMessageCookieReply(&reply)
|
||||
// check if transport
|
||||
|
||||
case MessageTransportType:
|
||||
|
||||
// lookup key pair
|
||||
// check size
|
||||
|
||||
if len(packet) < MessageTransportSize {
|
||||
return
|
||||
if len(packet) < MessageTransportType {
|
||||
continue
|
||||
}
|
||||
|
||||
// lookup key pair
|
||||
|
||||
receiver := binary.LittleEndian.Uint32(
|
||||
packet[MessageTransportOffsetReceiver:MessageTransportOffsetCounter],
|
||||
)
|
||||
value := device.indices.Lookup(receiver)
|
||||
keyPair := value.keyPair
|
||||
if keyPair == nil {
|
||||
return
|
||||
continue
|
||||
}
|
||||
|
||||
// check key-pair expiry
|
||||
|
||||
if keyPair.created.Add(RejectAfterTime).Before(time.Now()) {
|
||||
return
|
||||
continue
|
||||
}
|
||||
|
||||
// add to peer queue
|
||||
// create work element
|
||||
|
||||
peer := value.peer
|
||||
elem := &QueueInboundElement{
|
||||
|
|
@ -233,11 +204,33 @@ func (device *Device) RoutineReceiveIncomming() {
|
|||
device.addToInboundQueue(device.queue.decryption, elem)
|
||||
device.addToInboundQueue(peer.queue.inbound, elem)
|
||||
buffer = nil
|
||||
continue
|
||||
|
||||
default:
|
||||
logInfo.Println("Got unknown message from:", raddr)
|
||||
// otherwise it is a handshake related packet
|
||||
|
||||
case MessageInitiationType:
|
||||
okay = len(packet) == MessageInitiationSize
|
||||
|
||||
case MessageResponseType:
|
||||
okay = len(packet) == MessageResponseSize
|
||||
|
||||
case MessageCookieReplyType:
|
||||
okay = len(packet) == MessageCookieReplySize
|
||||
}
|
||||
|
||||
if okay {
|
||||
device.addToHandshakeQueue(
|
||||
device.queue.handshake,
|
||||
QueueHandshakeElement{
|
||||
msgType: msgType,
|
||||
buffer: buffer,
|
||||
packet: packet,
|
||||
source: raddr,
|
||||
},
|
||||
)
|
||||
buffer = device.GetMessageBuffer()
|
||||
}
|
||||
}
|
||||
}()
|
||||
}
|
||||
}
|
||||
|
||||
|
|
@ -306,62 +299,77 @@ func (device *Device) RoutineHandshake() {
|
|||
return
|
||||
}
|
||||
|
||||
func() {
|
||||
// handle cookie fields and ratelimiting
|
||||
|
||||
// verify mac1
|
||||
switch elem.msgType {
|
||||
|
||||
case MessageCookieReplyType:
|
||||
|
||||
// verify and update peer cookie state
|
||||
|
||||
var reply MessageCookieReply
|
||||
reader := bytes.NewReader(elem.packet)
|
||||
err := binary.Read(reader, binary.LittleEndian, &reply)
|
||||
if err != nil {
|
||||
logDebug.Println("Failed to decode cookie reply")
|
||||
return
|
||||
}
|
||||
device.ConsumeMessageCookieReply(&reply)
|
||||
continue
|
||||
|
||||
case MessageInitiationType, MessageResponseType:
|
||||
|
||||
// check mac fields and ratelimit
|
||||
|
||||
if !device.mac.CheckMAC1(elem.packet) {
|
||||
logDebug.Println("Received packet with invalid mac1")
|
||||
return
|
||||
}
|
||||
|
||||
// verify mac2
|
||||
|
||||
busy := atomic.LoadInt32(&device.underLoad) == AtomicTrue
|
||||
|
||||
if busy && !device.mac.CheckMAC2(elem.packet, elem.source) {
|
||||
if busy {
|
||||
if !device.mac.CheckMAC2(elem.packet, elem.source) {
|
||||
sender := binary.LittleEndian.Uint32(elem.packet[4:8]) // "sender" always follows "type"
|
||||
reply, err := device.CreateMessageCookieReply(elem.packet, sender, elem.source)
|
||||
if err != nil {
|
||||
logError.Println("Failed to create cookie reply:", err)
|
||||
return
|
||||
}
|
||||
// TODO: Use temp
|
||||
writer := bytes.NewBuffer(elem.packet[:0])
|
||||
writer := bytes.NewBuffer(temp[:0])
|
||||
binary.Write(writer, binary.LittleEndian, reply)
|
||||
elem.packet = writer.Bytes()
|
||||
_, err = device.net.conn.WriteToUDP(elem.packet, elem.source)
|
||||
_, err = device.net.conn.WriteToUDP(
|
||||
writer.Bytes(),
|
||||
elem.source,
|
||||
)
|
||||
if err != nil {
|
||||
logDebug.Println("Failed to send cookie reply:", err)
|
||||
}
|
||||
return
|
||||
continue
|
||||
}
|
||||
|
||||
// ratelimit
|
||||
|
||||
// TODO: Only ratelimit when busy
|
||||
|
||||
if !device.ratelimiter.Allow(elem.source.IP) {
|
||||
return
|
||||
continue
|
||||
}
|
||||
}
|
||||
|
||||
// handle messages
|
||||
default:
|
||||
logError.Println("Invalid packet ended up in the handshake queue")
|
||||
continue
|
||||
}
|
||||
|
||||
// handle handshake initation/response content
|
||||
|
||||
switch elem.msgType {
|
||||
case MessageInitiationType:
|
||||
|
||||
// unmarshal
|
||||
|
||||
if len(elem.packet) != MessageInitiationSize {
|
||||
return
|
||||
}
|
||||
|
||||
var msg MessageInitiation
|
||||
reader := bytes.NewReader(elem.packet)
|
||||
err := binary.Read(reader, binary.LittleEndian, &msg)
|
||||
if err != nil {
|
||||
logError.Println("Failed to decode initiation message")
|
||||
return
|
||||
continue
|
||||
}
|
||||
|
||||
// consume initiation
|
||||
|
|
@ -373,7 +381,7 @@ func (device *Device) RoutineHandshake() {
|
|||
elem.source.IP.String(),
|
||||
elem.source.Port,
|
||||
)
|
||||
return
|
||||
continue
|
||||
}
|
||||
|
||||
// update timers
|
||||
|
|
@ -382,7 +390,7 @@ func (device *Device) RoutineHandshake() {
|
|||
peer.TimerAnyAuthenticatedPacketReceived()
|
||||
|
||||
// update endpoint
|
||||
// TODO: Add a race condition \s
|
||||
// TODO: Discover destination address also, only update on change
|
||||
|
||||
peer.mutex.Lock()
|
||||
peer.endpoint = elem.source
|
||||
|
|
@ -393,7 +401,7 @@ func (device *Device) RoutineHandshake() {
|
|||
response, err := device.CreateMessageResponse(peer)
|
||||
if err != nil {
|
||||
logError.Println("Failed to create response message:", err)
|
||||
return
|
||||
continue
|
||||
}
|
||||
|
||||
peer.TimerEphemeralKeyCreated()
|
||||
|
|
@ -408,23 +416,21 @@ func (device *Device) RoutineHandshake() {
|
|||
|
||||
// send response
|
||||
|
||||
peer.SendBuffer(packet)
|
||||
_, err = peer.SendBuffer(packet)
|
||||
if err == nil {
|
||||
peer.TimerAnyAuthenticatedPacketTraversal()
|
||||
}
|
||||
|
||||
case MessageResponseType:
|
||||
|
||||
// unmarshal
|
||||
|
||||
if len(elem.packet) != MessageResponseSize {
|
||||
return
|
||||
}
|
||||
|
||||
var msg MessageResponse
|
||||
reader := bytes.NewReader(elem.packet)
|
||||
err := binary.Read(reader, binary.LittleEndian, &msg)
|
||||
if err != nil {
|
||||
logError.Println("Failed to decode response message")
|
||||
return
|
||||
continue
|
||||
}
|
||||
|
||||
// consume response
|
||||
|
|
@ -436,9 +442,11 @@ func (device *Device) RoutineHandshake() {
|
|||
elem.source.IP.String(),
|
||||
elem.source.Port,
|
||||
)
|
||||
return
|
||||
continue
|
||||
}
|
||||
|
||||
peer.TimerEphemeralKeyCreated()
|
||||
|
||||
// update timers
|
||||
|
||||
peer.TimerAnyAuthenticatedPacketTraversal()
|
||||
|
|
@ -449,11 +457,7 @@ func (device *Device) RoutineHandshake() {
|
|||
|
||||
peer.NewKeyPair()
|
||||
peer.SendKeepAlive()
|
||||
|
||||
default:
|
||||
logError.Println("Invalid message type in handshake queue")
|
||||
}
|
||||
}()
|
||||
}
|
||||
}
|
||||
|
||||
|
|
@ -463,6 +467,7 @@ func (peer *Peer) RoutineSequentialReceiver() {
|
|||
device := peer.device
|
||||
|
||||
logInfo := device.log.Info
|
||||
logError := device.log.Error
|
||||
logDebug := device.log.Debug
|
||||
logDebug.Println("Routine, sequential receiver, started for peer", peer.id)
|
||||
|
||||
|
|
@ -478,15 +483,14 @@ func (peer *Peer) RoutineSequentialReceiver() {
|
|||
|
||||
// process packet
|
||||
|
||||
func() {
|
||||
if elem.IsDropped() {
|
||||
return
|
||||
continue
|
||||
}
|
||||
|
||||
// check for replay
|
||||
|
||||
if !elem.keyPair.replayFilter.ValidateCounter(elem.counter) {
|
||||
return
|
||||
continue
|
||||
}
|
||||
|
||||
peer.TimerAnyAuthenticatedPacketTraversal()
|
||||
|
|
@ -509,7 +513,7 @@ func (peer *Peer) RoutineSequentialReceiver() {
|
|||
|
||||
if len(elem.packet) == 0 {
|
||||
logDebug.Println("Received keep-alive from", peer.String())
|
||||
return
|
||||
continue
|
||||
}
|
||||
peer.TimerDataReceived()
|
||||
|
||||
|
|
@ -521,12 +525,15 @@ func (peer *Peer) RoutineSequentialReceiver() {
|
|||
// strip padding
|
||||
|
||||
if len(elem.packet) < ipv4.HeaderLen {
|
||||
return
|
||||
continue
|
||||
}
|
||||
|
||||
field := elem.packet[IPv4offsetTotalLength : IPv4offsetTotalLength+2]
|
||||
length := binary.BigEndian.Uint16(field)
|
||||
// TODO: check length of packet & NOT TOO SMALL either
|
||||
if int(length) > len(elem.packet) || int(length) < ipv4.HeaderLen {
|
||||
continue
|
||||
}
|
||||
|
||||
elem.packet = elem.packet[:length]
|
||||
|
||||
// verify IPv4 source
|
||||
|
|
@ -534,7 +541,7 @@ func (peer *Peer) RoutineSequentialReceiver() {
|
|||
src := elem.packet[IPv4offsetSrc : IPv4offsetSrc+net.IPv4len]
|
||||
if device.routingTable.LookupIPv4(src) != peer {
|
||||
logInfo.Println("Packet with unallowed source IP from", peer.String())
|
||||
return
|
||||
continue
|
||||
}
|
||||
|
||||
case ipv6.Version:
|
||||
|
|
@ -542,13 +549,16 @@ func (peer *Peer) RoutineSequentialReceiver() {
|
|||
// strip padding
|
||||
|
||||
if len(elem.packet) < ipv6.HeaderLen {
|
||||
return
|
||||
continue
|
||||
}
|
||||
|
||||
field := elem.packet[IPv6offsetPayloadLength : IPv6offsetPayloadLength+2]
|
||||
length := binary.BigEndian.Uint16(field)
|
||||
length += ipv6.HeaderLen
|
||||
// TODO: check length of packet
|
||||
if int(length) > len(elem.packet) {
|
||||
continue
|
||||
}
|
||||
|
||||
elem.packet = elem.packet[:length]
|
||||
|
||||
// verify IPv6 source
|
||||
|
|
@ -556,38 +566,21 @@ func (peer *Peer) RoutineSequentialReceiver() {
|
|||
src := elem.packet[IPv6offsetSrc : IPv6offsetSrc+net.IPv6len]
|
||||
if device.routingTable.LookupIPv6(src) != peer {
|
||||
logInfo.Println("Packet with unallowed source IP from", peer.String())
|
||||
return
|
||||
continue
|
||||
}
|
||||
|
||||
default:
|
||||
logInfo.Println("Packet with invalid IP version from", peer.String())
|
||||
return
|
||||
continue
|
||||
}
|
||||
|
||||
// write to tun
|
||||
|
||||
atomic.AddUint64(&peer.stats.rxBytes, uint64(len(elem.packet)))
|
||||
device.addToInboundQueue(device.queue.inbound, elem)
|
||||
|
||||
// TODO: move TUN write into per peer routine
|
||||
}()
|
||||
}
|
||||
}
|
||||
|
||||
func (device *Device) RoutineWriteToTUN() {
|
||||
|
||||
logError := device.log.Error
|
||||
logDebug := device.log.Debug
|
||||
logDebug.Println("Routine, sequential tun writer, started")
|
||||
|
||||
for {
|
||||
select {
|
||||
case <-device.signal.stop:
|
||||
return
|
||||
case elem := <-device.queue.inbound:
|
||||
_, err := device.tun.Write(elem.packet)
|
||||
device.PutMessageBuffer(elem.buffer)
|
||||
if err != nil {
|
||||
logError.Println("Failed to write packet to TUN device:", err)
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
|
|||
|
|
@ -168,8 +168,6 @@ func (device *Device) RoutineReadFromTUN() {
|
|||
continue
|
||||
}
|
||||
|
||||
println(size, err)
|
||||
|
||||
elem.packet = elem.packet[:size]
|
||||
|
||||
// lookup peer
|
||||
|
|
@ -210,6 +208,7 @@ func (device *Device) RoutineReadFromTUN() {
|
|||
|
||||
// insert into nonce/pre-handshake queue
|
||||
|
||||
signalSend(peer.signal.handshakeReset)
|
||||
addToOutboundQueue(peer.queue.nonce, elem)
|
||||
elem = nil
|
||||
|
||||
|
|
|
|||
|
|
@ -4,6 +4,7 @@ import (
|
|||
"bytes"
|
||||
"encoding/binary"
|
||||
"golang.org/x/crypto/blake2s"
|
||||
"math/rand"
|
||||
"sync/atomic"
|
||||
"time"
|
||||
)
|
||||
|
|
@ -16,12 +17,11 @@ func (peer *Peer) KeepKeyFreshSending() {
|
|||
if kp == nil {
|
||||
return
|
||||
}
|
||||
if !kp.isInitiator {
|
||||
return
|
||||
}
|
||||
nonce := atomic.LoadUint64(&kp.sendNonce)
|
||||
send := nonce > RekeyAfterMessages || time.Now().Sub(kp.created) > RekeyAfterTime
|
||||
if send {
|
||||
if nonce > RekeyAfterMessages {
|
||||
signalSend(peer.signal.handshakeBegin)
|
||||
}
|
||||
if kp.isInitiator && time.Now().Sub(kp.created) > RekeyAfterTime {
|
||||
signalSend(peer.signal.handshakeBegin)
|
||||
}
|
||||
}
|
||||
|
|
@ -30,6 +30,7 @@ func (peer *Peer) KeepKeyFreshSending() {
|
|||
*
|
||||
*/
|
||||
func (peer *Peer) KeepKeyFreshReceiving() {
|
||||
// TODO: Add a guard, clear on handshake complete (clear in TimerHandshakeComplete)
|
||||
kp := peer.keyPairs.Current()
|
||||
if kp == nil {
|
||||
return
|
||||
|
|
@ -108,7 +109,6 @@ func (peer *Peer) TimerAnyAuthenticatedPacketTraversal() {
|
|||
* - First transport message under the "next" key
|
||||
*/
|
||||
func (peer *Peer) TimerHandshakeComplete() {
|
||||
timerStop(peer.timer.zeroAllKeys)
|
||||
atomic.StoreInt64(
|
||||
&peer.stats.lastHandshakeNano,
|
||||
time.Now().UnixNano(),
|
||||
|
|
@ -129,10 +129,7 @@ func (peer *Peer) TimerHandshakeComplete() {
|
|||
* upon failure to complete a handshake
|
||||
*/
|
||||
func (peer *Peer) TimerEphemeralKeyCreated() {
|
||||
if !peer.timer.pendingZeroAllKeys {
|
||||
peer.timer.pendingZeroAllKeys = true
|
||||
peer.timer.zeroAllKeys.Reset(RejectAfterTime * 3)
|
||||
}
|
||||
}
|
||||
|
||||
func (peer *Peer) RoutineTimerHandler() {
|
||||
|
|
@ -154,19 +151,19 @@ func (peer *Peer) RoutineTimerHandler() {
|
|||
|
||||
interval := atomic.LoadUint64(&peer.persistentKeepaliveInterval)
|
||||
if interval > 0 {
|
||||
logDebug.Println("Sending persistent keep-alive to", peer.String())
|
||||
logDebug.Println("Sending keep-alive to", peer.String())
|
||||
peer.SendKeepAlive()
|
||||
}
|
||||
|
||||
case <-peer.timer.keepalivePassive.C:
|
||||
|
||||
logDebug.Println("Sending passive keep-alive to", peer.String())
|
||||
logDebug.Println("Sending keep-alive to", peer.String())
|
||||
|
||||
peer.SendKeepAlive()
|
||||
|
||||
if peer.timer.needAnotherKeepalive {
|
||||
peer.timer.keepalivePassive.Reset(KeepaliveTimeout)
|
||||
peer.timer.needAnotherKeepalive = true
|
||||
peer.timer.needAnotherKeepalive = false
|
||||
}
|
||||
|
||||
// unresponsive session
|
||||
|
|
@ -189,8 +186,6 @@ func (peer *Peer) RoutineTimerHandler() {
|
|||
kp := &peer.keyPairs
|
||||
kp.mutex.Lock()
|
||||
|
||||
peer.timer.pendingZeroAllKeys = false
|
||||
|
||||
// unmap indecies
|
||||
|
||||
indices.mutex.Lock()
|
||||
|
|
@ -251,40 +246,41 @@ func (peer *Peer) RoutineHandshakeInitiator() {
|
|||
return
|
||||
}
|
||||
|
||||
// wait for handshake
|
||||
// set deadline
|
||||
|
||||
deadline := time.Now().Add(MaxHandshakeAttemptTime)
|
||||
BeginHandshakes:
|
||||
|
||||
signalClear(peer.signal.handshakeReset)
|
||||
deadline := time.NewTimer(RekeyAttemptTime)
|
||||
|
||||
AttemptHandshakes:
|
||||
|
||||
Loop:
|
||||
for attempts := uint(1); ; attempts++ {
|
||||
|
||||
// clear completed signal
|
||||
// check if deadline reached
|
||||
|
||||
select {
|
||||
case <-peer.signal.handshakeCompleted:
|
||||
case <-deadline.C:
|
||||
logInfo.Println("Handshake negotiation timed out for:", peer.String())
|
||||
signalSend(peer.signal.flushNonceQueue)
|
||||
timerStop(peer.timer.keepalivePersistent)
|
||||
break
|
||||
case <-peer.signal.stop:
|
||||
return
|
||||
default:
|
||||
}
|
||||
|
||||
// check if sufficient time for retry
|
||||
|
||||
if deadline.Before(time.Now().Add(RekeyTimeout)) {
|
||||
logInfo.Println("Handshake negotiation timed out for", peer.String())
|
||||
signalSend(peer.signal.flushNonceQueue)
|
||||
timerStop(peer.timer.keepalivePersistent)
|
||||
timerStop(peer.timer.keepalivePassive)
|
||||
break Loop
|
||||
}
|
||||
signalClear(peer.signal.handshakeCompleted)
|
||||
|
||||
// create initiation message
|
||||
|
||||
msg, err := peer.device.CreateMessageInitiation(peer)
|
||||
if err != nil {
|
||||
logError.Println("Failed to create handshake initiation message:", err)
|
||||
break Loop
|
||||
break AttemptHandshakes
|
||||
}
|
||||
peer.TimerEphemeralKeyCreated()
|
||||
|
||||
jitter := time.Millisecond * time.Duration(rand.Uint32()%334)
|
||||
|
||||
// marshal and send
|
||||
|
||||
|
|
@ -299,14 +295,14 @@ func (peer *Peer) RoutineHandshakeInitiator() {
|
|||
"Failed to send handshake initiation message to",
|
||||
peer.String(), ":", err,
|
||||
)
|
||||
continue
|
||||
break
|
||||
}
|
||||
|
||||
peer.TimerAnyAuthenticatedPacketTraversal()
|
||||
|
||||
// set timeout
|
||||
// set handshake timeout
|
||||
|
||||
timeout := time.NewTimer(RekeyTimeout)
|
||||
timeout := time.NewTimer(RekeyTimeout + jitter)
|
||||
logDebug.Println(
|
||||
"Handshake initiation attempt",
|
||||
attempts, "sent to", peer.String(),
|
||||
|
|
@ -321,15 +317,19 @@ func (peer *Peer) RoutineHandshakeInitiator() {
|
|||
|
||||
case <-peer.signal.handshakeCompleted:
|
||||
<-timeout.C
|
||||
break Loop
|
||||
break AttemptHandshakes
|
||||
|
||||
case <-peer.signal.handshakeReset:
|
||||
<-timeout.C
|
||||
goto BeginHandshakes
|
||||
|
||||
case <-timeout.C:
|
||||
// TODO: Clear source address for peer
|
||||
continue
|
||||
|
||||
}
|
||||
}
|
||||
|
||||
// allow new signal to be set
|
||||
// clear signal set in the meantime
|
||||
|
||||
signalClear(peer.signal.handshakeBegin)
|
||||
}
|
||||
|
|
|
|||
11
src/tun.go
11
src/tun.go
|
|
@ -6,10 +6,19 @@ package main
|
|||
|
||||
const DefaultMTU = 1420
|
||||
|
||||
type TUNEvent int
|
||||
|
||||
const (
|
||||
TUNEventUp = 1 << iota
|
||||
TUNEventDown
|
||||
TUNEventMTUUpdate
|
||||
)
|
||||
|
||||
type TUNDevice interface {
|
||||
Read([]byte) (int, error) // read a packet from the device (without any additional headers)
|
||||
Write([]byte) (int, error) // writes a packet to the device (without any additional headers)
|
||||
IsUp() (bool, error) // is the interface up?
|
||||
MTU() (int, error) // returns the MTU of the device
|
||||
Name() string // returns the current name
|
||||
Events() chan TUNEvent // returns a constant channel of events related to the device
|
||||
Close() error // stops the device and closes the event channel
|
||||
}
|
||||
|
|
|
|||
|
|
@ -18,9 +18,10 @@ const CloneDevicePath = "/dev/net/tun"
|
|||
type NativeTun struct {
|
||||
fd *os.File
|
||||
name string
|
||||
events chan TUNEvent
|
||||
}
|
||||
|
||||
func (tun *NativeTun) IsUp() (bool, error) {
|
||||
func (tun *NativeTun) isUp() (bool, error) {
|
||||
inter, err := net.InterfaceByName(tun.name)
|
||||
return inter.Flags&net.FlagUp != 0, err
|
||||
}
|
||||
|
|
@ -111,6 +112,14 @@ func (tun *NativeTun) Read(d []byte) (int, error) {
|
|||
return tun.fd.Read(d)
|
||||
}
|
||||
|
||||
func (tun *NativeTun) Events() chan TUNEvent {
|
||||
return tun.events
|
||||
}
|
||||
|
||||
func (tun *NativeTun) Close() error {
|
||||
return nil
|
||||
}
|
||||
|
||||
func CreateTUN(name string) (TUNDevice, error) {
|
||||
|
||||
// open clone device
|
||||
|
|
@ -148,8 +157,12 @@ func CreateTUN(name string) (TUNDevice, error) {
|
|||
device := &NativeTun{
|
||||
fd: fd,
|
||||
name: newName,
|
||||
events: make(chan TUNEvent, 5),
|
||||
}
|
||||
|
||||
// TODO: Wait for device to be upped
|
||||
device.events <- TUNEventUp
|
||||
|
||||
// set default MTU
|
||||
|
||||
err = device.setMTU(DefaultMTU)
|
||||
|
|
|
|||
|
|
@ -7,7 +7,6 @@ import (
|
|||
"net"
|
||||
"os"
|
||||
"path"
|
||||
"time"
|
||||
)
|
||||
|
||||
const (
|
||||
|
|
@ -29,6 +28,7 @@ type UAPIListener struct {
|
|||
listener net.Listener // unix socket listener
|
||||
connNew chan net.Conn
|
||||
connErr chan error
|
||||
inotifyFd int
|
||||
}
|
||||
|
||||
func (l *UAPIListener) Accept() (net.Conn, error) {
|
||||
|
|
@ -106,9 +106,28 @@ func NewUAPIListener(name string) (net.Listener, error) {
|
|||
|
||||
// watch for deletion of socket
|
||||
|
||||
uapi.inotifyFd, err = unix.InotifyInit()
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
_, err = unix.InotifyAddWatch(
|
||||
uapi.inotifyFd,
|
||||
socketPath,
|
||||
unix.IN_ATTRIB|
|
||||
unix.IN_DELETE|
|
||||
unix.IN_DELETE_SELF,
|
||||
)
|
||||
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
go func(l *UAPIListener) {
|
||||
for ; ; time.Sleep(time.Second) {
|
||||
if _, err := os.Stat(socketPath); os.IsNotExist(err) {
|
||||
var buff [4096]byte
|
||||
for {
|
||||
unix.Read(uapi.inotifyFd, buff[:])
|
||||
if _, err := os.Lstat(socketPath); os.IsNotExist(err) {
|
||||
l.connErr <- err
|
||||
return
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue