/*
GoVPN -- simple secure free software virtual private network daemon
-Copyright (C) 2014-2015 Sergey Matveev <stargrave@stargrave.org>
+Copyright (C) 2014-2016 Sergey Matveev <stargrave@stargrave.org>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
-// Simple secure free software virtual private network daemon client.
+// Simple secure, DPI/censorship-resistant free software VPN daemon client.
package main
import (
)
var (
- remoteAddr = flag.String("remote", "", "Remote server address")
- ifaceName = flag.String("iface", "tap0", "TAP network interface")
- IDRaw = flag.String("id", "", "Client identification")
- keyPath = flag.String("key", "", "Path to passphrase file")
- upPath = flag.String("up", "", "Path to up-script")
- downPath = flag.String("down", "", "Path to down-script")
- stats = flag.String("stats", "", "Enable stats retrieving on host:port")
- mtu = flag.Int("mtu", 1452, "MTU for outgoing packets")
- nonceDiff = flag.Int("noncediff", 1, "Allow nonce difference")
- timeoutP = flag.Int("timeout", 60, "Timeout seconds")
- noisy = flag.Bool("noise", false, "Enable noise appending")
- cpr = flag.Int("cpr", 0, "Enable constant KiB/sec out traffic rate")
- egdPath = flag.String("egd", "", "Optional path to EGD socket")
+ remoteAddr = flag.String("remote", "", "Remote server address")
+ proto = flag.String("proto", "udp", "Protocol to use: udp or tcp")
+ ifaceName = flag.String("iface", "tap0", "TAP network interface")
+ verifierRaw = flag.String("verifier", "", "Verifier")
+ keyPath = flag.String("key", "", "Path to passphrase file")
+ upPath = flag.String("up", "", "Path to up-script")
+ downPath = flag.String("down", "", "Path to down-script")
+ stats = flag.String("stats", "", "Enable stats retrieving on host:port")
+ proxyAddr = flag.String("proxy", "", "Use HTTP proxy on host:port")
+ proxyAuth = flag.String("proxy-auth", "", "user:password Basic proxy auth")
+ mtu = flag.Int("mtu", govpn.MTUDefault, "MTU of TAP interface")
+ timeoutP = flag.Int("timeout", 60, "Timeout seconds")
+ noisy = flag.Bool("noise", false, "Enable noise appending")
+ encless = flag.Bool("encless", false, "Encryptionless mode")
+ cpr = flag.Int("cpr", 0, "Enable constant KiB/sec out traffic rate")
+ egdPath = flag.String("egd", "", "Optional path to EGD socket")
+
+ conf *govpn.PeerConf
+ tap *govpn.TAP
+ timeout int
+ firstUpCall bool = true
+ knownPeers govpn.KnownPeers
+ idsCache *govpn.CipherCache
)
func main() {
flag.Parse()
- timeout := *timeoutP
+ timeout = *timeoutP
var err error
log.SetFlags(log.Ldate | log.Lmicroseconds | log.Lshortfile)
- govpn.MTU = *mtu
-
- id, err := govpn.IDDecode(*IDRaw)
- if err != nil {
- log.Fatalln(err)
+ if *mtu > govpn.MTUMax {
+ log.Fatalln("Maximum allowable MTU is", govpn.MTUMax)
}
-
if *egdPath != "" {
log.Println("Using", *egdPath, "EGD")
govpn.EGDInit(*egdPath)
}
- pub, priv := govpn.NewVerifier(id, govpn.StringFromFile(*keyPath))
- conf := &govpn.PeerConf{
- Id: id,
- Timeout: time.Second * time.Duration(timeout),
- Noncediff: *nonceDiff,
- NoiseEnable: *noisy,
- CPR: *cpr,
- DSAPub: pub,
- DSAPriv: priv,
- }
- govpn.PeersInitDummy(id, conf)
-
- bind, err := net.ResolveUDPAddr("udp", "0.0.0.0:0")
+ verifier, err := govpn.VerifierFromString(*verifierRaw)
if err != nil {
- log.Fatalln("Can not resolve address:", err)
+ log.Fatalln(err)
}
- conn, err := net.ListenUDP("udp", bind)
- if err != nil {
- log.Fatalln("Can not listen on UDP:", err)
+ priv := verifier.PasswordApply(govpn.StringFromFile(*keyPath))
+ if *encless {
+ if *proto != "tcp" {
+ log.Fatalln("Currently encryptionless mode works only with TCP")
+ }
+ *noisy = true
}
- remote, err := net.ResolveUDPAddr("udp", *remoteAddr)
- if err != nil {
- log.Fatalln("Can not resolve remote address:", err)
+ conf = &govpn.PeerConf{
+ Id: verifier.Id,
+ Iface: *ifaceName,
+ MTU: *mtu,
+ Timeout: time.Second * time.Duration(timeout),
+ Noise: *noisy,
+ CPR: *cpr,
+ Encless: *encless,
+ Verifier: verifier,
+ DSAPriv: priv,
}
+ idsCache = govpn.NewCipherCache([]govpn.PeerId{*verifier.Id})
+ log.Println(govpn.VersionGet())
- tap, ethSink, ethReady, _, err := govpn.TAPListen(
- *ifaceName,
- time.Second*time.Duration(timeout),
- *cpr,
- )
+ tap, err = govpn.TAPListen(*ifaceName, *mtu)
if err != nil {
log.Fatalln("Can not listen on TAP interface:", err)
}
- udpSink, udpBuf, udpReady := govpn.ConnListen(conn)
-
- timeouts := 0
- firstUpCall := true
- var peer *govpn.Peer
- var ethPkt []byte
- var udpPkt govpn.UDPPkt
- var udpPktData []byte
- knownPeers := govpn.KnownPeers(map[string]**govpn.Peer{remote.String(): &peer})
- log.Println(govpn.VersionGet())
- log.Println("Max MTU on TAP interface:", govpn.TAPMaxMTU())
if *stats != "" {
log.Println("Stats are going to listen on", *stats)
statsPort, err := net.Listen("tcp", *stats)
termSignal := make(chan os.Signal, 1)
signal.Notify(termSignal, os.Interrupt, os.Kill)
- log.Println("Starting handshake")
- handshake := govpn.HandshakeStart(conf, conn, remote)
-
MainCycle:
for {
- if peer != nil && (peer.BytesIn+peer.BytesOut) > govpn.MaxBytesPerKey {
- peer.Zero()
- peer = nil
- handshake = govpn.HandshakeStart(conf, conn, remote)
- log.Println("Rehandshaking")
+ timeouted := make(chan struct{})
+ rehandshaking := make(chan struct{})
+ termination := make(chan struct{})
+ if *proxyAddr != "" {
+ *proto = "tcp"
+ }
+ switch *proto {
+ case "udp":
+ go startUDP(timeouted, rehandshaking, termination)
+ case "tcp":
+ if *proxyAddr != "" {
+ go proxyTCP(timeouted, rehandshaking, termination)
+ } else {
+ go startTCP(timeouted, rehandshaking, termination)
+ }
+ default:
+ log.Fatalln("Unknown protocol specified")
}
select {
case <-termSignal:
+ log.Fatalln("Finishing")
+ termination <- struct{}{}
break MainCycle
- case ethPkt = <-ethSink:
- if peer == nil {
- if len(ethPkt) > 0 {
- ethReady <- struct{}{}
- }
- continue
- }
- peer.EthProcess(ethPkt, conn, ethReady)
- case udpPkt = <-udpSink:
- timeouts++
- if timeouts >= timeout {
- break MainCycle
- }
- if udpPkt.Addr == nil {
- udpReady <- struct{}{}
- continue
- }
-
- udpPktData = udpBuf[:udpPkt.Size]
- if peer == nil {
- if udpPkt.Addr.String() != remote.String() {
- udpReady <- struct{}{}
- log.Println("Unknown handshake message")
- continue
- }
- if govpn.IDsCache.Find(udpPktData) == nil {
- log.Println("Invalid identity in handshake packet")
- udpReady <- struct{}{}
- continue
- }
- if p := handshake.Client(conn, udpPktData); p != nil {
- log.Println("Handshake completed")
- if firstUpCall {
- go govpn.ScriptCall(*upPath, *ifaceName)
- firstUpCall = false
- }
- peer = p
- handshake.Zero()
- handshake = nil
- }
- udpReady <- struct{}{}
- continue
- }
- if peer == nil {
- udpReady <- struct{}{}
- continue
- }
- if peer.UDPProcess(udpPktData, tap, udpReady) {
- timeouts = 0
- }
+ case <-timeouted:
+ break MainCycle
+ case <-rehandshaking:
}
+ close(timeouted)
+ close(rehandshaking)
+ close(termination)
}
govpn.ScriptCall(*downPath, *ifaceName)
}