snow/wireguard-go
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First set of code review patches

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This commit is contained in:
Mathias Hall-Andersen 2017-08-04 16:15:53 +02:00
parent 22c83f4b8d
commit 8c34c4cbb3
15 changed files with 315 additions and 182 deletions
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163
src/config.go
View file

@ -61,6 +61,7 @@ func ipcGetOperation(device *Device, socket *bufio.ReadWriter) *IPCError {
send(fmt.Sprintf("persistent_keepalive_interval=%d",
atomic.LoadUint64(&peer.persistentKeepaliveInterval),
))
for _, ip := range device.routingTable.AllowedIPs(peer) {
send("allowed_ip=" + ip.String())
}
@ -89,6 +90,9 @@ func ipcSetOperation(device *Device, socket *bufio.ReadWriter) *IPCError {
logDebug := device.log.Debug
var peer *Peer
deviceConfig := true
for scanner.Scan() {
// parse line
@ -99,15 +103,16 @@ func ipcSetOperation(device *Device, socket *bufio.ReadWriter) *IPCError {
}
parts := strings.Split(line, "=")
if len(parts) != 2 {
return &IPCError{Code: ipcErrorNoKeyValue}
return &IPCError{Code: ipcErrorProtocol}
}
key := parts[0]
value := parts[1]
/* device configuration */
if deviceConfig {
switch key {
/* interface configuration */
case "private_key":
var sk NoisePrivateKey
if value == "" {
@ -116,7 +121,7 @@ func ipcSetOperation(device *Device, socket *bufio.ReadWriter) *IPCError {
err := sk.FromHex(value)
if err != nil {
logError.Println("Failed to set private_key:", err)
return &IPCError{Code: ipcErrorInvalidValue}
return &IPCError{Code: ipcErrorInvalid}
}
device.SetPrivateKey(sk)
}
@ -125,7 +130,7 @@ func ipcSetOperation(device *Device, socket *bufio.ReadWriter) *IPCError {
port, err := strconv.ParseUint(value, 10, 16)
if err != nil {
logError.Println("Failed to set listen_port:", err)
return &IPCError{Code: ipcErrorInvalidValue}
return &IPCError{Code: ipcErrorInvalid}
}
netc := &device.net
netc.mutex.Lock()
@ -139,46 +144,69 @@ func ipcSetOperation(device *Device, socket *bufio.ReadWriter) *IPCError {
netc.mutex.Unlock()
if err != nil {
logError.Println("Failed to create UDP listener:", err)
return &IPCError{Code: ipcErrorInvalidValue}
return &IPCError{Code: ipcErrorIO}
}
// TODO: Clear source address of all peers
case "fwmark":
logError.Println("FWMark not handled yet")
// TODO: Clear source address of all peers
case "public_key":
// switch to peer configuration
deviceConfig = false
case "replace_peers":
if value != "true" {
logError.Println("Failed to set replace_peers, invalid value:", value)
return &IPCError{Code: ipcErrorInvalid}
}
device.RemoveAllPeers()
default:
logError.Println("Invalid UAPI key (device configuration):", key)
return &IPCError{Code: ipcErrorInvalid}
}
}
/* peer configuration */
if !deviceConfig {
switch key {
case "public_key":
var pubKey NoisePublicKey
err := pubKey.FromHex(value)
if err != nil {
logError.Println("Failed to get peer by public_key:", err)
return &IPCError{Code: ipcErrorInvalidValue}
return &IPCError{Code: ipcErrorInvalid}
}
// check if public key of peer equal to device
device.mutex.RLock()
if device.publicKey.Equals(pubKey) {
device.mutex.RUnlock()
logError.Println("Public key of peer matches private key of device")
return &IPCError{Code: ipcErrorInvalid}
}
// find peer referenced
peer, _ = device.peers[pubKey]
device.mutex.RUnlock()
if peer == nil {
peer = device.NewPeer(pubKey)
}
case "replace_peers":
if value == "true" {
device.RemoveAllPeers()
} else {
logError.Println("Failed to set replace_peers, invalid value:", value)
return &IPCError{Code: ipcErrorInvalidValue}
}
default:
/* peer configuration */
if peer == nil {
logError.Println("No peer referenced, before peer operation")
return &IPCError{Code: ipcErrorNoPeer}
}
switch key {
case "remove":
if value != "true" {
logError.Println("Failed to set remove, invalid value:", value)
return &IPCError{Code: ipcErrorInvalid}
}
device.RemovePeer(peer.handshake.remoteStatic)
logDebug.Println("Removing", peer.String())
peer = nil
@ -191,50 +219,67 @@ func ipcSetOperation(device *Device, socket *bufio.ReadWriter) *IPCError {
}()
if err != nil {
logError.Println("Failed to set preshared_key:", err)
return &IPCError{Code: ipcErrorInvalidValue}
return &IPCError{Code: ipcErrorInvalid}
}
case "endpoint":
// TODO: Only IP and port
addr, err := net.ResolveUDPAddr("udp", value)
if err != nil {
logError.Println("Failed to set endpoint:", value)
return &IPCError{Code: ipcErrorInvalidValue}
return &IPCError{Code: ipcErrorInvalid}
}
peer.mutex.Lock()
peer.endpoint = addr
peer.mutex.Unlock()
case "persistent_keepalive_interval":
secs, err := strconv.ParseInt(value, 10, 64)
if secs < 0 || err != nil {
// update keep-alive interval
secs, err := strconv.ParseUint(value, 10, 16)
if err != nil {
logError.Println("Failed to set persistent_keepalive_interval:", err)
return &IPCError{Code: ipcErrorInvalidValue}
return &IPCError{Code: ipcErrorInvalid}
}
atomic.StoreUint64(
old := atomic.SwapUint64(
&peer.persistentKeepaliveInterval,
uint64(secs),
secs,
)
case "replace_allowed_ips":
if value == "true" {
device.routingTable.RemovePeer(peer)
} else {
logError.Println("Failed to set replace_allowed_ips, invalid value:", value)
return &IPCError{Code: ipcErrorInvalidValue}
// send immediate keep-alive
if old == 0 && secs != 0 {
up, err := device.tun.IsUp()
if err != nil {
logError.Println("Failed to get tun device status:", err)
return &IPCError{Code: ipcErrorIO}
}
if up {
peer.SendKeepAlive()
}
}
case "replace_allowed_ips":
if value != "true" {
logError.Println("Failed to set replace_allowed_ips, invalid value:", value)
return &IPCError{Code: ipcErrorInvalid}
}
device.routingTable.RemovePeer(peer)
case "allowed_ip":
_, network, err := net.ParseCIDR(value)
if err != nil {
logError.Println("Failed to set allowed_ip:", err)
return &IPCError{Code: ipcErrorInvalidValue}
return &IPCError{Code: ipcErrorInvalid}
}
ones, _ := network.Mask.Size()
device.routingTable.Insert(network.IP, uint(ones), peer)
default:
logError.Println("Invalid UAPI key:", key)
return &IPCError{Code: ipcErrorInvalidKey}
logError.Println("Invalid UAPI key (peer configuration):", key)
return &IPCError{Code: ipcErrorInvalid}
}
}
}
@ -244,6 +289,8 @@ func ipcSetOperation(device *Device, socket *bufio.ReadWriter) *IPCError {
func ipcHandle(device *Device, socket net.Conn) {
// create buffered read/writer
defer socket.Close()
buffered := func(s io.ReadWriter) *bufio.ReadWriter {
@ -259,30 +306,30 @@ func ipcHandle(device *Device, socket net.Conn) {
return
}
switch op {
// handle operation
var status *IPCError
switch op {
case "set=1\n":
device.log.Debug.Println("Config, set operation")
err := ipcSetOperation(device, buffered)
if err != nil {
fmt.Fprintf(buffered, "errno=%d\n\n", err.ErrorCode())
} else {
fmt.Fprintf(buffered, "errno=0\n\n")
}
return
status = ipcSetOperation(device, buffered)
case "get=1\n":
device.log.Debug.Println("Config, get operation")
err := ipcGetOperation(device, buffered)
if err != nil {
fmt.Fprintf(buffered, "errno=%d\n\n", err.ErrorCode())
} else {
fmt.Fprintf(buffered, "errno=0\n\n")
}
return
status = ipcGetOperation(device, buffered)
default:
device.log.Error.Println("Invalid UAPI operation:", op)
return
}
// write status
if status != nil {
device.log.Error.Println(status)
fmt.Fprintf(buffered, "errno=%d\n\n", status.ErrorCode())
} else {
fmt.Fprintf(buffered, "errno=0\n\n")
}
}

3
src/constants.go
View file

@ -16,6 +16,7 @@ const (
KeepaliveTimeout = time.Second * 10
CookieRefreshTime = time.Second * 120
MaxHandshakeAttemptTime = time.Second * 90
PaddingMultiple = 16
)
const (
@ -31,5 +32,5 @@ const (
QueueHandshakeSize = 1024
QueueHandshakeBusySize = QueueHandshakeSize / 8
MinMessageSize = MessageTransportSize // size of keep-alive
MaxMessageSize = (1 << 16) - 1
MaxMessageSize = ((1 << 16) - 1) + MessageTransportHeaderSize
)

42
src/device.go
View file

@ -1,6 +1,8 @@
package main
import (
"errors"
"fmt"
"net"
"runtime"
"sync"
@ -10,6 +12,7 @@ import (
type Device struct {
mtu int32
tun TUNDevice
log *Logger // collection of loggers for levels
idCounter uint // for assigning debug ids to peers
fwMark uint32
@ -43,24 +46,46 @@ type Device struct {
mac MACStateDevice
}
func (device *Device) SetPrivateKey(sk NoisePrivateKey) {
func (device *Device) SetPrivateKey(sk NoisePrivateKey) error {
device.mutex.Lock()
defer device.mutex.Unlock()
// check if public key is matching any peer
publicKey := sk.publicKey()
for _, peer := range device.peers {
h := &peer.handshake
h.mutex.RLock()
if h.remoteStatic.Equals(publicKey) {
h.mutex.RUnlock()
return errors.New("Private key matches public key of peer")
}
h.mutex.RUnlock()
}
// update key material
device.privateKey = sk
device.publicKey = sk.publicKey()
device.mac.Init(device.publicKey)
device.publicKey = publicKey
device.mac.Init(publicKey)
// do DH precomputations
isZero := device.privateKey.IsZero()
for _, peer := range device.peers {
h := &peer.handshake
h.mutex.Lock()
if isZero {
h.precomputedStaticStatic = [NoisePublicKeySize]byte{}
} else {
h.precomputedStaticStatic = device.privateKey.sharedSecret(h.remoteStatic)
}
fmt.Println(h.precomputedStaticStatic)
h.mutex.Unlock()
}
return nil
}
func (device *Device) GetMessageBuffer() *[MaxMessageSize]byte {
@ -77,6 +102,7 @@ func NewDevice(tun TUNDevice, logLevel int) *Device {
device.mutex.Lock()
defer device.mutex.Unlock()
device.tun = tun
device.log = NewLogger(logLevel)
device.peers = make(map[NoisePublicKey]*Peer)
device.indices.Init()
@ -119,22 +145,22 @@ func NewDevice(tun TUNDevice, logLevel int) *Device {
}
go device.RoutineBusyMonitor()
go device.RoutineMTUUpdater(tun)
go device.RoutineWriteToTUN(tun)
go device.RoutineReadFromTUN(tun)
go device.RoutineMTUUpdater()
go device.RoutineWriteToTUN()
go device.RoutineReadFromTUN()
go device.RoutineReceiveIncomming()
go device.ratelimiter.RoutineGarbageCollector(device.signal.stop)
return device
}
func (device *Device) RoutineMTUUpdater(tun TUNDevice) {
func (device *Device) RoutineMTUUpdater() {
logError := device.log.Error
for ; ; time.Sleep(5 * time.Second) {
// load updated MTU
mtu, err := tun.MTU()
mtu, err := device.tun.MTU()
if err != nil {
logError.Println("Failed to load updated MTU of device:", err)
continue

10
src/index.go
View file

@ -3,6 +3,7 @@ package main
import (
"crypto/rand"
"sync"
"unsafe"
)
/* Index=0 is reserved for unset indecies
@ -23,14 +24,7 @@ type IndexTable struct {
func randUint32() (uint32, error) {
var buff [4]byte
_, err := rand.Read(buff[:])
id := uint32(buff[0])
id <<= 8
id |= uint32(buff[1])
id <<= 8
id |= uint32(buff[2])
id <<= 8
id |= uint32(buff[3])
return id, err
return *((*uint32)(unsafe.Pointer(&buff))), err
}
func (table *IndexTable) Init() {

15
src/macs.go
View file

@ -3,7 +3,6 @@ package main
import (
"crypto/hmac"
"crypto/rand"
"errors"
"golang.org/x/crypto/blake2s"
"net"
"sync"
@ -15,14 +14,14 @@ type MACStateDevice struct {
refreshed time.Time
secret [blake2s.Size]byte
keyMAC1 [blake2s.Size]byte
keyMAC2 [blake2s.Size]byte
keyMAC2 [blake2s.Size]byte // TODO: Change to more descriptive size constant, rename to something.
}
type MACStatePeer struct {
mutex sync.RWMutex
cookieSet time.Time
cookie [blake2s.Size128]byte
lastMAC1 [blake2s.Size128]byte
lastMAC1 [blake2s.Size128]byte // TODO: Check if set
keyMAC1 [blake2s.Size]byte
keyMAC2 [blake2s.Size]byte
}
@ -83,7 +82,7 @@ func (state *MACStateDevice) CheckMAC2(msg []byte, addr *net.UDPAddr) bool {
port := [2]byte{byte(addr.Port >> 8), byte(addr.Port)}
mac, _ := blake2s.New128(state.secret[:])
mac.Write(addr.IP)
mac.Write(port[:])
mac.Write(port[:]) // TODO: Be faster and more platform dependent?
mac.Sum(cookie[:0])
}()
@ -130,7 +129,7 @@ func (device *Device) CreateMessageCookieReply(
port := [2]byte{byte(addr.Port >> 8), byte(addr.Port)}
mac, _ := blake2s.New128(state.secret[:])
mac.Write(addr.IP)
mac.Write(port[:])
mac.Write(port[:]) // TODO: Do whatever we did above
mac.Sum(cookie[:0])
}()
@ -196,6 +195,7 @@ func (device *Device) ConsumeMessageCookieReply(msg *MessageCookieReply) bool {
if err != nil {
return false
}
state.cookieSet = time.Now()
state.cookie = cookie
return true
@ -229,10 +229,6 @@ func (state *MACStatePeer) Init(pk NoisePublicKey) {
func (state *MACStatePeer) AddMacs(msg []byte) {
size := len(msg)
if size < blake2s.Size128*2 {
panic(errors.New("bug: message too short"))
}
startMac1 := size - (blake2s.Size128 * 2)
startMac2 := size - blake2s.Size128
@ -250,6 +246,7 @@ func (state *MACStatePeer) AddMacs(msg []byte) {
mac.Sum(mac1[:0])
}()
copy(state.lastMAC1[:], mac1)
// TODO: Set lastMac flag
// set mac2

8
src/noise_helpers.go
View file

@ -47,6 +47,14 @@ func KDF3(key []byte, input []byte) (t0 [blake2s.Size]byte, t1 [blake2s.Size]byt
return
}
func isZero(val []byte) bool {
var acc byte
for _, b := range val {
acc |= b
}
return acc == 0
}
/* curve25519 wrappers */
func newPrivateKey() (sk NoisePrivateKey, err error) {

9
src/noise_protocol.go
View file

@ -135,6 +135,10 @@ func (device *Device) CreateMessageInitiation(peer *Peer) (*MessageInitiation, e
handshake.mutex.Lock()
defer handshake.mutex.Unlock()
if isZero(handshake.precomputedStaticStatic[:]) {
return nil, errors.New("Static shared secret is zero")
}
// create ephemeral key
var err error
@ -226,7 +230,11 @@ func (device *Device) ConsumeMessageInitiation(msg *MessageInitiation) *Peer {
if peer == nil {
return nil
}
handshake := &peer.handshake
if isZero(handshake.precomputedStaticStatic[:]) {
return nil
}
// verify identity
@ -472,6 +480,7 @@ func (peer *Peer) NewKeyPair() *KeyPair {
func() {
kp.mutex.Lock()
defer kp.mutex.Unlock()
// TODO: Adapt kernel behavior noise.c:161
if isInitiator {
if kp.previous != nil {
kp.previous.send = nil

22
src/noise_types.go
View file

@ -1,6 +1,7 @@
package main
import (
"crypto/subtle"
"encoding/hex"
"errors"
"golang.org/x/crypto/chacha20poly1305"
@ -31,12 +32,12 @@ func loadExactHex(dst []byte, src string) error {
}
func (key NoisePrivateKey) IsZero() bool {
for _, b := range key[:] {
if b != 0 {
return false
}
}
return true
var zero NoisePrivateKey
return key.Equals(zero)
}
func (key NoisePrivateKey) Equals(tar NoisePrivateKey) bool {
return subtle.ConstantTimeCompare(key[:], tar[:]) == 1
}
func (key *NoisePrivateKey) FromHex(src string) error {
@ -55,6 +56,15 @@ func (key NoisePublicKey) ToHex() string {
return hex.EncodeToString(key[:])
}
func (key NoisePublicKey) IsZero() bool {
var zero NoisePublicKey
return key.Equals(zero)
}
func (key NoisePublicKey) Equals(tar NoisePublicKey) bool {
return subtle.ConstantTimeCompare(key[:], tar[:]) == 1
}
func (key *NoiseSymmetricKey) FromHex(src string) error {
return loadExactHex(key[:], src)
}

44
src/receive.go
View file

@ -73,6 +73,8 @@ func (device *Device) addToHandshakeQueue(
}
/* Routine determining the busy state of the interface
*
* TODO: Under load for some time
*/
func (device *Device) RoutineBusyMonitor() {
samples := 0
@ -131,6 +133,7 @@ func (device *Device) RoutineReceiveIncomming() {
buffer = device.GetMessageBuffer()
}
// TODO: Take writelock to sleep
device.net.mutex.RLock()
conn := device.net.conn
device.net.mutex.RUnlock()
@ -139,6 +142,7 @@ func (device *Device) RoutineReceiveIncomming() {
continue
}
// TODO: Wait for new conn or message
conn.SetReadDeadline(time.Now().Add(time.Second))
size, raddr, err := conn.ReadFromUDP(buffer[:])
@ -156,6 +160,8 @@ func (device *Device) RoutineReceiveIncomming() {
case MessageInitiationType, MessageResponseType:
// TODO: Check size early
// add to handshake queue
device.addToHandshakeQueue(
@ -171,6 +177,8 @@ func (device *Device) RoutineReceiveIncomming() {
case MessageCookieReplyType:
// TODO: Queue all the things
// verify and update peer cookie state
if len(packet) != MessageCookieReplySize {
@ -250,7 +258,7 @@ func (device *Device) RoutineDecryption() {
// check if dropped
if elem.IsDropped() {
elem.mutex.Unlock()
elem.mutex.Unlock() // TODO: Make consistent with send
continue
}
@ -318,6 +326,7 @@ func (device *Device) RoutineHandshake() {
logError.Println("Failed to create cookie reply:", err)
return
}
// TODO: Use temp
writer := bytes.NewBuffer(elem.packet[:0])
binary.Write(writer, binary.LittleEndian, reply)
elem.packet = writer.Bytes()
@ -330,6 +339,8 @@ func (device *Device) RoutineHandshake() {
// ratelimit
// TODO: Only ratelimit when busy
if !device.ratelimiter.Allow(elem.source.IP) {
return
}
@ -364,9 +375,14 @@ func (device *Device) RoutineHandshake() {
)
return
}
peer.TimerPacketReceived()
// update timers
peer.TimerAnyAuthenticatedPacketTraversal()
peer.TimerAnyAuthenticatedPacketReceived()
// update endpoint
// TODO: Add a race condition \s
peer.mutex.Lock()
peer.endpoint = elem.source
@ -381,6 +397,7 @@ func (device *Device) RoutineHandshake() {
}
peer.TimerEphemeralKeyCreated()
peer.NewKeyPair()
logDebug.Println("Creating response message for", peer.String())
@ -392,8 +409,7 @@ func (device *Device) RoutineHandshake() {
// send response
peer.SendBuffer(packet)
peer.TimerPacketSent()
peer.NewKeyPair()
peer.TimerAnyAuthenticatedPacketTraversal()
case MessageResponseType:
@ -423,8 +439,14 @@ func (device *Device) RoutineHandshake() {
return
}
peer.TimerPacketReceived()
// update timers
peer.TimerAnyAuthenticatedPacketTraversal()
peer.TimerAnyAuthenticatedPacketReceived()
peer.TimerHandshakeComplete()
// derive key-pair
peer.NewKeyPair()
peer.SendKeepAlive()
@ -467,8 +489,8 @@ func (peer *Peer) RoutineSequentialReceiver() {
return
}
peer.TimerPacketReceived()
peer.TimerTransportReceived()
peer.TimerAnyAuthenticatedPacketTraversal()
peer.TimerAnyAuthenticatedPacketReceived()
peer.KeepKeyFreshReceiving()
// check if using new key-pair
@ -504,6 +526,7 @@ func (peer *Peer) RoutineSequentialReceiver() {
field := elem.packet[IPv4offsetTotalLength : IPv4offsetTotalLength+2]
length := binary.BigEndian.Uint16(field)
// TODO: check length of packet & NOT TOO SMALL either
elem.packet = elem.packet[:length]
// verify IPv4 source
@ -525,6 +548,7 @@ func (peer *Peer) RoutineSequentialReceiver() {
field := elem.packet[IPv6offsetPayloadLength : IPv6offsetPayloadLength+2]
length := binary.BigEndian.Uint16(field)
length += ipv6.HeaderLen
// TODO: check length of packet
elem.packet = elem.packet[:length]
// verify IPv6 source
@ -542,11 +566,13 @@ func (peer *Peer) RoutineSequentialReceiver() {
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(tun TUNDevice) {
func (device *Device) RoutineWriteToTUN() {
logError := device.log.Error
logDebug := device.log.Debug
@ -557,7 +583,7 @@ func (device *Device) RoutineWriteToTUN(tun TUNDevice) {
case <-device.signal.stop:
return
case elem := <-device.queue.inbound:
_, err := tun.Write(elem.packet)
_, err := device.tun.Write(elem.packet)
device.PutMessageBuffer(elem.buffer)
if err != nil {
logError.Println("Failed to write packet to TUN device:", err)

49
src/send.go
View file

@ -110,17 +110,19 @@ func addToEncryptionQueue(
}
func (peer *Peer) SendBuffer(buffer []byte) (int, error) {
peer.device.net.mutex.RLock()
defer peer.device.net.mutex.RUnlock()
peer.mutex.RLock()
defer peer.mutex.RUnlock()
endpoint := peer.endpoint
peer.mutex.RUnlock()
conn := peer.device.net.conn
if endpoint == nil {
return 0, ErrorNoEndpoint
}
peer.device.net.mutex.RLock()
conn := peer.device.net.conn
peer.device.net.mutex.RUnlock()
if conn == nil {
return 0, ErrorNoConnection
}
@ -133,13 +135,13 @@ func (peer *Peer) SendBuffer(buffer []byte) (int, error) {
*
* Obs. Single instance per TUN device
*/
func (device *Device) RoutineReadFromTUN(tun TUNDevice) {
func (device *Device) RoutineReadFromTUN() {
if tun == nil {
if device.tun == nil {
return
}
elem := device.NewOutboundElement()
var elem *QueueOutboundElement
logDebug := device.log.Debug
logError := device.log.Error
@ -153,32 +155,38 @@ func (device *Device) RoutineReadFromTUN(tun TUNDevice) {
elem = device.NewOutboundElement()
}
// TODO: THIS!
elem.packet = elem.buffer[MessageTransportHeaderSize:]
size, err := tun.Read(elem.packet)
size, err := device.tun.Read(elem.packet)
if err != nil {
// stop process
logError.Println("Failed to read packet from TUN device:", err)
device.Close()
return
}
elem.packet = elem.packet[:size]
if len(elem.packet) < ipv4.HeaderLen {
logError.Println("Packet too short, length:", size)
if size == 0 {
continue
}
println(size, err)
elem.packet = elem.packet[:size]
// lookup peer
var peer *Peer
switch elem.packet[0] >> 4 {
case ipv4.Version:
if len(elem.packet) < ipv4.HeaderLen {
continue
}
dst := elem.packet[IPv4offsetDst : IPv4offsetDst+net.IPv4len]
peer = device.routingTable.LookupIPv4(dst)
case ipv6.Version:
if len(elem.packet) < ipv6.HeaderLen {
continue
}
dst := elem.packet[IPv6offsetDst : IPv6offsetDst+net.IPv6len]
peer = device.routingTable.LookupIPv6(dst)
@ -190,10 +198,15 @@ func (device *Device) RoutineReadFromTUN(tun TUNDevice) {
continue
}
// check if known endpoint
peer.mutex.RLock()
if peer.endpoint == nil {
peer.mutex.RUnlock()
logDebug.Println("No known endpoint for peer", peer.String())
continue
}
peer.mutex.RUnlock()
// insert into nonce/pre-handshake queue
@ -334,9 +347,13 @@ func (device *Device) RoutineEncryption() {
// pad content to MTU size
mtu := int(atomic.LoadInt32(&device.mtu))
for i := len(elem.packet); i < mtu; i++ {
pad := len(elem.packet) % PaddingMultiple
if pad > 0 {
for i := 0; i < PaddingMultiple-pad && len(elem.packet) < mtu; i++ {
elem.packet = append(elem.packet, 0)
}
// TODO: How good is this code
}
// encrypt content (append to header)
@ -390,7 +407,7 @@ func (peer *Peer) RoutineSequentialSender() {
// update timers
peer.TimerPacketSent()
peer.TimerAnyAuthenticatedPacketTraversal()
if len(elem.packet) != MessageKeepaliveSize {
peer.TimerDataSent()
}

33
src/timers.go
View file

@ -60,10 +60,8 @@ func (peer *Peer) SendKeepAlive() bool {
return true
}
/* Authenticated data packet send
* Always called together with peer.EventPacketSend
*
* - Start new handshake timer
/* Event:
* Sent non-empty (authenticated) transport message
*/
func (peer *Peer) TimerDataSent() {
timerStop(peer.timer.keepalivePassive)
@ -75,8 +73,6 @@ func (peer *Peer) TimerDataSent() {
/* Event:
* Received non-empty (authenticated) transport message
*
* - Start passive keep-alive timer
*/
func (peer *Peer) TimerDataReceived() {
if peer.timer.pendingKeepalivePassive {
@ -88,17 +84,16 @@ func (peer *Peer) TimerDataReceived() {
}
/* Event:
* Any (authenticated) transport message received
* (keep-alive or data)
* Any (authenticated) packet received
*/
func (peer *Peer) TimerTransportReceived() {
func (peer *Peer) TimerAnyAuthenticatedPacketReceived() {
timerStop(peer.timer.newHandshake)
}
/* Event:
* Any packet send to the peer.
* Any authenticated packet send / received.
*/
func (peer *Peer) TimerPacketSent() {
func (peer *Peer) TimerAnyAuthenticatedPacketTraversal() {
interval := atomic.LoadUint64(&peer.persistentKeepaliveInterval)
if interval > 0 {
duration := time.Duration(interval) * time.Second
@ -106,13 +101,6 @@ func (peer *Peer) TimerPacketSent() {
}
}
/* Event:
* Any authenticated packet received from peer
*/
func (peer *Peer) TimerPacketReceived() {
peer.TimerPacketSent()
}
/* Called after succesfully completing a handshake.
* i.e. after:
*
@ -129,7 +117,9 @@ func (peer *Peer) TimerHandshakeComplete() {
peer.device.log.Info.Println("Negotiated new handshake for", peer.String())
}
/* Called whenever an ephemeral key is generated
/* Event:
* An ephemeral key is generated
*
* i.e after:
*
* CreateMessageInitiation
@ -257,7 +247,6 @@ func (peer *Peer) RoutineHandshakeInitiator() {
select {
case <-peer.signal.handshakeBegin:
signalSend(peer.signal.handshakeBegin)
case <-peer.signal.stop:
return
}
@ -303,7 +292,6 @@ func (peer *Peer) RoutineHandshakeInitiator() {
binary.Write(writer, binary.LittleEndian, msg)
packet := writer.Bytes()
peer.mac.AddMacs(packet)
peer.TimerPacketSent()
_, err = peer.SendBuffer(packet)
if err != nil {
@ -314,6 +302,8 @@ func (peer *Peer) RoutineHandshakeInitiator() {
continue
}
peer.TimerAnyAuthenticatedPacketTraversal()
// set timeout
timeout := time.NewTimer(RekeyTimeout)
@ -337,7 +327,6 @@ func (peer *Peer) RoutineHandshakeInitiator() {
continue
}
}
// allow new signal to be set

9
src/trie.go
View file

@ -32,11 +32,14 @@ type Trie struct {
/* Finds length of matching prefix
* TODO: Make faster
*
* Assumption: len(ip1) == len(ip2)
* Assumption:
* len(ip1) == len(ip2)
* len(ip1) mod 4 = 0
*/
func commonBits(ip1 net.IP, ip2 net.IP) uint {
func commonBits(ip1 []byte, ip2 []byte) uint {
var i uint
size := uint(len(ip1))
size := uint(len(ip1)) / 4
for i = 0; i < size; i++ {
v := ip1[i] ^ ip2[i]
if v != 0 {

1
src/tun.go
View file

@ -9,6 +9,7 @@ const DefaultMTU = 1420
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
}

6
src/tun_linux.go
View file

@ -7,6 +7,7 @@ import (
"encoding/binary"
"errors"
"golang.org/x/sys/unix"
"net"
"os"
"strings"
"unsafe"
@ -19,6 +20,11 @@ type NativeTun struct {
name string
}
func (tun *NativeTun) IsUp() (bool, error) {
inter, err := net.InterfaceByName(tun.name)
return inter.Flags&net.FlagUp != 0, err
}
func (tun *NativeTun) Name() string {
return tun.name
}

9
src/uapi_linux.go
View file

@ -11,11 +11,10 @@ import (
)
const (
ipcErrorIO = int64(unix.EIO)
ipcErrorNoPeer = int64(unix.EPROTO)
ipcErrorNoKeyValue = int64(unix.EPROTO)
ipcErrorInvalidKey = int64(unix.EPROTO)
ipcErrorInvalidValue = int64(unix.EPROTO)
ipcErrorIO = -int64(unix.EIO)
ipcErrorNotDefined = -int64(unix.ENODEV)
ipcErrorProtocol = -int64(unix.EPROTO)
ipcErrorInvalid = -int64(unix.EINVAL)
socketDirectory = "/var/run/wireguard"
socketName = "%s.sock"
)