mirror of https://gogs.blitter.com/RLabs/xs
Tunnels working again to basic level w/o re-connect or re-dial
This commit is contained in:
Russ Magee
parent
081d88b9ad
commit
a425afe9b6
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@ -532,7 +532,7 @@ func (hc *Conn) Close() (err error) {
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log.Printf("** Writing closeStat %d at Close()\n", *hc.closeStat)
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hc.WritePacket(s, CSOExitStatus)
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err = (*hc.c).Close()
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logger.LogNotice(fmt.Sprintln("[Conn Closing]"))
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logger.LogDebug(fmt.Sprintln("[Conn Closing]"))
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return
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}
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@ -602,7 +602,7 @@ func Listen(protocol string, ipport string) (hl HKExListener, e error) {
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if err != nil {
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return HKExListener{nil}, err
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}
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logger.LogNotice(fmt.Sprintf("[Listening on %s]\n", ipport))
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logger.LogDebug(fmt.Sprintf("[Listening on %s]\n", ipport))
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hl.l = l
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return
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}
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@ -612,7 +612,7 @@ func Listen(protocol string, ipport string) (hl HKExListener, e error) {
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//
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// See go doc net.Listener.Close
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func (hl HKExListener) Close() error {
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logger.LogNotice(fmt.Sprintln("[Listener Closed]"))
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logger.LogDebug(fmt.Sprintln("[Listener Closed]"))
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return hl.l.Close()
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}
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@ -632,7 +632,7 @@ func (hl *HKExListener) Accept() (hc Conn, err error) {
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if err != nil {
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return Conn{}, err
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}
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logger.LogNotice(fmt.Sprintln("[net.Listener Accepted]"))
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logger.LogDebug(fmt.Sprintln("[net.Listener Accepted]"))
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// Read KEx alg proposed by client
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var kexAlg KEXAlg
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@ -701,11 +701,11 @@ func (hc Conn) Read(b []byte) (n int, err error) {
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return 0, io.EOF
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}
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if strings.HasSuffix(err.Error(), "use of closed network connection") {
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logger.LogNotice(fmt.Sprintln("[Client hung up]"))
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logger.LogDebug(fmt.Sprintln("[Client hung up]"))
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return 0, io.EOF
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}
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etxt := fmt.Sprintf("** Failed read:%s (%s) **", "ctrlStatOp", err)
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logger.LogErr(etxt)
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logger.LogDebug(etxt)
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return 0, errors.New(etxt)
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}
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log.Printf("[ctrlStatOp: %v]\n", ctrlStatOp)
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@ -722,11 +722,11 @@ func (hc Conn) Read(b []byte) (n int, err error) {
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return 0, io.EOF
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}
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if strings.HasSuffix(err.Error(), "use of closed network connection") {
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logger.LogNotice(fmt.Sprintln("[Client hung up]"))
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logger.LogDebug(fmt.Sprintln("[Client hung up]"))
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return 0, io.EOF
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}
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etxt := fmt.Sprintf("** Failed read:%s (%s) **", "HMAC", err)
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logger.LogErr(etxt)
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logger.LogDebug(etxt)
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return 0, errors.New(etxt)
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}
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@ -736,16 +736,16 @@ func (hc Conn) Read(b []byte) (n int, err error) {
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return 0, io.EOF
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}
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if strings.HasSuffix(err.Error(), "use of closed network connection") {
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logger.LogNotice(fmt.Sprintln("[Client hung up]"))
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logger.LogDebug(fmt.Sprintln("[Client hung up]"))
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return 0, io.EOF
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}
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etxt := fmt.Sprintf("** Failed read:%s (%s) **", "payloadLen", err)
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logger.LogErr(etxt)
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logger.LogDebug(etxt)
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return 0, errors.New(etxt)
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}
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if payloadLen > MAX_PAYLOAD_LEN {
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logger.LogErr(fmt.Sprintf("[Insane payloadLen:%v]\n", payloadLen))
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logger.LogDebug(fmt.Sprintf("[Insane payloadLen:%v]\n", payloadLen))
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hc.Close()
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return 1, errors.New("Insane payloadLen")
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}
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@ -757,11 +757,11 @@ func (hc Conn) Read(b []byte) (n int, err error) {
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return 0, io.EOF
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}
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if strings.HasSuffix(err.Error(), "use of closed network connection") {
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logger.LogNotice(fmt.Sprintln("[Client hung up]"))
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logger.LogDebug(fmt.Sprintln("[Client hung up]"))
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return 0, io.EOF
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}
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etxt := fmt.Sprintf("** Failed read:%s (%s) **", "payloadBytes", err)
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logger.LogErr(etxt)
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logger.LogDebug(etxt)
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return 0, errors.New(etxt)
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}
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@ -806,45 +806,57 @@ func (hc Conn) Read(b []byte) (n int, err error) {
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if len(payloadBytes) > 0 {
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hc.SetStatus(CSOType(binary.BigEndian.Uint32(payloadBytes)))
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} else {
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logger.LogErr(fmt.Sprintln("[truncated payload, cannot determine CSOExitStatus]"))
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logger.LogDebug(fmt.Sprintln("[truncated payload, cannot determine CSOExitStatus]"))
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hc.SetStatus(CSETruncCSO)
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}
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hc.Close()
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} else if ctrlStatOp == CSOTunSetup {
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// server side tunnel setup in response to client
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lport := binary.BigEndian.Uint16(payloadBytes)
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lport := binary.BigEndian.Uint16(payloadBytes[0:2])
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rport := binary.BigEndian.Uint16(payloadBytes[2:4])
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log.Printf("Tunnel setup [%d:%d]\r\n", lport, rport)
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StartServerTunnel(&hc, lport, rport)
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logger.LogDebug(fmt.Sprintf("Read(): Tunnel setup [%d:%d]", lport, rport))
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hc.StartServerTunnel(lport, rport)
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} else if ctrlStatOp == CSOTunSetupAck {
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// client side has received ack from server
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lport := binary.BigEndian.Uint16(payloadBytes)
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lport := binary.BigEndian.Uint16(payloadBytes[0:2])
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rport := binary.BigEndian.Uint16(payloadBytes[2:4])
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log.Printf("Tunnel ack [%d:%d]\r\n", lport, rport)
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} else if ctrlStatOp == CSOTunData {
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lport := binary.BigEndian.Uint16(payloadBytes)
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rport := binary.BigEndian.Uint16(payloadBytes[2:4])
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_ = lport
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//fmt.Printf("[Got CSOTunData: [lport %d:rport %d] data:%v\n", lport, rport, payloadBytes[4:])
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if hc.tuns[rport] == nil {
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fmt.Printf("[Invalid rport:%d]\r\n", rport)
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} else {
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hc.tuns[rport].Data <- payloadBytes[4:]
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}
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} else {
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logger.LogDebug(fmt.Sprintf("Read(): Tunnel setup ack [%d:%d]", lport, rport))
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hc.dBuf.Write(payloadBytes)
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//log.Printf("hc.dBuf: %s\n", hex.Dump(hc.dBuf.Bytes()))
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} else if ctrlStatOp == CSOTunRefused {
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// client side has been told nothing is listening on rport
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lport := binary.BigEndian.Uint16(payloadBytes[0:2])
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rport := binary.BigEndian.Uint16(payloadBytes[2:4])
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logger.LogDebug(fmt.Sprintf("Read(): Tunnel refused [%d:%d]", lport, rport))
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} else if ctrlStatOp == CSOTunDisconn {
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// server side's rport has disconnected (server lost)
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lport := binary.BigEndian.Uint16(payloadBytes[0:2])
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rport := binary.BigEndian.Uint16(payloadBytes[2:4])
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logger.LogDebug(fmt.Sprintf("Read(): Tunnel server disconnected [%d:%d]", lport, rport))
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} else if ctrlStatOp == CSOTunHangup {
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// client side's lport has hung up
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lport := binary.BigEndian.Uint16(payloadBytes[0:2])
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rport := binary.BigEndian.Uint16(payloadBytes[2:4])
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logger.LogDebug(fmt.Sprintf("Read(): Tunnel client hung up [%d:%d]", lport, rport))
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} else if ctrlStatOp == CSOTunData {
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lport := binary.BigEndian.Uint16(payloadBytes[0:2])
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rport := binary.BigEndian.Uint16(payloadBytes[2:4])
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//fmt.Printf("[Got CSOTunData: [lport %d:rport %d] data:%v\n", lport, rport, payloadBytes[4:])
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logger.LogDebug(fmt.Sprintf("[Writing data to rport [%d:%d] %v", lport, rport, payloadBytes[4:]))
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hc.tuns[rport].Data <- payloadBytes[4:]
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} else if ctrlStatOp == CSONone {
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hc.dBuf.Write(payloadBytes)
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} else {
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logger.LogDebug(fmt.Sprintf("[Unknown CSOType:%d]", ctrlStatOp))
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}
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hTmp := hc.rm.Sum(nil)[0:HMAC_CHK_SZ]
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log.Printf("<%04x) HMAC:(i)%s (c)%02x\r\n", decryptN, hex.EncodeToString([]byte(hmacIn[0:])), hTmp)
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if *hc.closeStat == CSETruncCSO {
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logger.LogErr(fmt.Sprintln("[cannot verify HMAC]"))
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logger.LogDebug(fmt.Sprintln("[cannot verify HMAC]"))
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} else {
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// Log alert if hmac didn't match, corrupted channel
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if !bytes.Equal(hTmp, []byte(hmacIn[0:])) /*|| hmacIn[0] > 0xf8*/ {
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logger.LogErr(fmt.Sprintln("** ALERT - detected HMAC mismatch, possible channel tampering **"))
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logger.LogDebug(fmt.Sprintln("** ALERT - detected HMAC mismatch, possible channel tampering **"))
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_, _ = (*hc.c).Write([]byte{CSOHmacInvalid})
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}
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}
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@ -881,25 +893,6 @@ func (hc *Conn) WritePacket(b []byte, ctrlStatOp byte) (n int, err error) {
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return 0, errors.New("Secure chan not ready for writing")
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}
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if ctrlStatOp == CSOTunSetup {
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// Client-side tunnel setup
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lport := binary.BigEndian.Uint16(b)
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rport := binary.BigEndian.Uint16(b[2:4])
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// spawn workers to listen for data and tunnel events
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// via channel comms to hc.tuns[rport].tunCtl
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StartClientTunnel(hc, lport, rport)
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// CSOTunSetup is written through to server side,
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// see hc.Read()
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} else if ctrlStatOp == CSOTunSetupAck {
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lport := binary.BigEndian.Uint16(b)
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rport := binary.BigEndian.Uint16(b[2:4])
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if lport == 0 || rport == 0 {
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log.Printf("Responded with tunnel setup nak [%d:%d]\r\n", lport, rport)
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} else {
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log.Printf("Responded with tunnel setup ack [%d:%d]\r\n", lport, rport)
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}
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}
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//Padding prior to encryption
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padSz := (rand.Intn(PAD_SZ) / 2) + (PAD_SZ / 2)
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padLen := padSz - ((len(b) + padSz) % padSz)
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@ -11,11 +11,11 @@ package hkexnet
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import (
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"bytes"
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"encoding/binary"
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//"fmt"
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//"io"
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//"log"
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"fmt"
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"io"
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"net"
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//"blitter.com/go/hkexsh/logger"
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"blitter.com/go/hkexsh/logger"
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)
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type (
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@ -42,32 +42,48 @@ type (
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Rport uint16 // Names are from client's perspective
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Lport uint16 // ... ie., RPort is on server, LPort is on client
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Peer string //net.Addr
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//Status byte //Last status of tunnel (eg., CSOTunSetupAck)
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Ctl chan<- rune //See TunCtl_* consts
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Data chan []byte
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}
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TunPacket struct {
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n uint32
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data []byte
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}
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//TunPacket struct {
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// n uint32
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// data []byte
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//}
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)
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func StartClientTunnel(hc *Conn, lport, rport uint16) {
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func (hc *Conn) InitTunEndpoint(lp uint16, p string /* net.Addr */, rp uint16) {
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if hc.tuns == nil {
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hc.tuns = make(map[uint16]*TunEndpoint)
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}
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if hc.tuns[rport] == nil {
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addrs, _ := net.InterfaceAddrs()
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hc.tuns[rport] = &TunEndpoint{Peer: addrs[0].String(),
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Lport: lport, Rport: rport, Ctl: make(chan<- rune)}
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if hc.tuns[rp] == nil {
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var addrs []net.Addr
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if p == "" {
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addrs, _ = net.InterfaceAddrs()
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p = addrs[0].String()
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}
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hc.tuns[rp] = &TunEndpoint{/*Status: CSOTunSetup,*/ Peer: p,
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Lport: lp, Rport: rp, Data: make(chan[]byte, 32), Ctl: make(chan<- rune)}
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logger.LogDebug(fmt.Sprintf("InitTunEndpoint [%d:%s:%d]\n", lp, p, rp))
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}
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return
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}
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/*
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//func (hc *Conn) GetTunStatus(rp uint16) byte {
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// return hc.tuns[rp].Status
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//}
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func (hc *Conn) StartClientTunnel(lport, rport uint16) {
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hc.InitTunEndpoint(lport, "", rport)
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t := hc.tuns[rport] // for convenience
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go func() {
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logger.LogDebug(fmt.Sprintf("Listening for client tunnel port %d", lport))
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l, e := net.Listen("tcp", fmt.Sprintf(":%d", lport))
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if e != nil {
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fmt.Printf("[Could not get lport %d! (%s)\n", lport, e)
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logger.LogDebug(fmt.Sprintf("[Could not get lport %d! (%s)", lport, e))
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} else {
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defer l.Close()
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for {
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@ -82,11 +98,11 @@ func StartClientTunnel(hc *Conn, lport, rport uint16) {
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}()
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if e != nil {
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log.Printf("Accept() got error(%v), hanging up.\n", e)
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logger.LogDebug(fmt.Sprintf("Accept() got error(%v), hanging up.", e))
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break
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//log.Fatal(err)
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} else {
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log.Println("Accepted client")
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logger.LogDebug(fmt.Sprintln("Accepted tunnel client"))
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// outside client -> tunnel lport
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go func() {
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@ -99,16 +115,16 @@ func StartClientTunnel(hc *Conn, lport, rport uint16) {
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n, e := c.Read(rBuf)
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if e != nil {
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if e == io.EOF {
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logger.LogNotice(fmt.Sprintf("lport Disconnected: shutting down tunnel [%d:%d]\n", lport, rport))
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logger.LogDebug(fmt.Sprintf("lport Disconnected: shutting down tunnel [%d:%d]", lport, rport))
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} else {
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logger.LogErr(fmt.Sprintf("Read error from lport of tun [%d:%d]\n%s", lport, rport, e))
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logger.LogDebug(fmt.Sprintf("Read error from lport of tun [%d:%d]\n%s", lport, rport, e))
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}
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hc.WritePacket(tunDst.Bytes(), CSOTunClose)
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hc.WritePacket(tunDst.Bytes(), CSOTunHangup)
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break
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}
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if n > 0 {
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rBuf = append(tunDst.Bytes(), rBuf[:n]...)
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logger.LogNotice(fmt.Sprintf("Got lport data:%v\n", tunDst.Bytes()))
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//logger.LogDebug(fmt.Sprintf("Got lport data:%v", tunDst.Bytes()))
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hc.WritePacket(rBuf[:n+4], CSOTunData)
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}
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}
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@ -126,12 +142,12 @@ func StartClientTunnel(hc *Conn, lport, rport uint16) {
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for {
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//fmt.Printf("Reading from client hc.tuns[%d]\n", lport)
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bytes, ok := <-hc.tuns[rport]
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bytes, ok := <-t.Data
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if ok {
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//fmt.Printf("[Got this through tunnel:%v]\n", bytes)
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c.Write(bytes)
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} else {
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fmt.Printf("[Channel closed?]\n")
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logger.LogDebug(fmt.Sprintf("[Channel closed?]\n"))
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//break
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}
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}
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@ -141,41 +157,27 @@ func StartClientTunnel(hc *Conn, lport, rport uint16) {
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}
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}
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}()
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*/
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}
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func StartServerTunnel(hc *Conn, lport, rport uint16) {
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if hc.tuns == nil {
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hc.tuns = make(map[uint16]*TunEndpoint)
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}
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if hc.tuns[rport] == nil {
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addrs, _ := net.InterfaceAddrs()
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hc.tuns[rport] = &TunEndpoint{Peer: addrs[0].String(),
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Lport: lport, Rport: rport, Ctl: make(chan<- rune)}
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}
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// Inform client of the tunPort
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var resp bytes.Buffer
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binary.Write(&resp, binary.BigEndian, hc.tuns[rport].Lport)
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binary.Write(&resp, binary.BigEndian, hc.tuns[rport].Rport)
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hc.WritePacket(resp.Bytes(), CSOTunSetupAck)
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/*
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t := TunEndpoint{Peer: addrs[0].String(), Lport: lport, Rport: rport}
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var resp bytes.Buffer
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binary.Write(&resp, binary.BigEndian, t.Lport)
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//var dialHangup chan<- bool
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func (hc *Conn) StartServerTunnel(lport, rport uint16) {
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hc.InitTunEndpoint(lport, "", rport)
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t := hc.tuns[rport] // for convenience
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logger.LogDebug("Server dialling...")
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c, err := net.Dial("tcp", fmt.Sprintf(":%d", rport))
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if err != nil {
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logger.LogErr(fmt.Sprintf("Nothing is serving at rport :%d!", rport))
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binary.Write(&resp, binary.BigEndian, uint16(0))
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// Inform client of the tunPort
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logger.LogDebug(fmt.Sprintf("Nothing is serving at rport :%d!", rport))
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var resp bytes.Buffer
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binary.Write(&resp, binary.BigEndian, lport)
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binary.Write(&resp, binary.BigEndian, rport)
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hc.WritePacket(resp.Bytes(), CSOTunRefused)
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} else {
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binary.Write(&resp, binary.BigEndian, t.Rport)
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logger.LogNotice(fmt.Sprintf("[Tunnel Opened - %d:%s:%d]", t.Lport, t.Peer, t.Rport))
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logger.LogDebug(fmt.Sprintf("[Tunnel Opened - %d:%s:%d]", lport, t.Peer, rport))
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var resp bytes.Buffer
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binary.Write(&resp, binary.BigEndian, lport)
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binary.Write(&resp, binary.BigEndian, rport)
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logger.LogDebug(fmt.Sprintf("[Writing CSOTunSetupAck[%d:%d]", lport, rport))
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hc.WritePacket(resp.Bytes(), CSOTunSetupAck)
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//
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// worker to read data from the rport (to encrypt & send to client)
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|
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@ -198,17 +200,19 @@ func StartServerTunnel(hc *Conn, lport, rport uint16) {
|
|||
n, e := c.Read(rBuf)
|
||||
if e != nil {
|
||||
if e == io.EOF {
|
||||
logger.LogNotice(fmt.Sprintf("rport Disconnected: shutting down tunnel %v\n", t))
|
||||
logger.LogDebug(fmt.Sprintf("rport Disconnected: shutting down tunnel %v\n", t))
|
||||
} else {
|
||||
logger.LogErr(fmt.Sprintf("Read error from rport of tun %v\n%s", t, e))
|
||||
logger.LogDebug(fmt.Sprintf("Read error from rport of tun %v\n%s", t, e))
|
||||
}
|
||||
hc.WritePacket(resp.Bytes(), CSOTunClose)
|
||||
fmt.Printf("Closing server rport net.Dial()\n")
|
||||
var resp bytes.Buffer
|
||||
binary.Write(&resp, binary.BigEndian, lport)
|
||||
binary.Write(&resp, binary.BigEndian, rport)
|
||||
hc.WritePacket(resp.Bytes(), CSOTunDisconn)
|
||||
logger.LogDebug(fmt.Sprintf("Closing server rport %d net.Dial()", t.Rport))
|
||||
break
|
||||
}
|
||||
if n > 0 {
|
||||
rBuf = append(tunDst.Bytes(), rBuf[:n]...)
|
||||
logger.LogNotice(fmt.Sprintf("Got rport data:%v", tunDst.Bytes()))
|
||||
hc.WritePacket(rBuf[:n+4], CSOTunData)
|
||||
}
|
||||
}
|
||||
|
|
@ -225,17 +229,15 @@ func StartServerTunnel(hc *Conn, lport, rport uint16) {
|
|||
}()
|
||||
|
||||
for {
|
||||
rData, ok := <-hc.tuns[rport]
|
||||
rData, ok := <-t.Data
|
||||
if ok {
|
||||
logger.LogNotice(fmt.Sprintf("Got client data:%v", rData))
|
||||
//logger.LogDebug(fmt.Sprintf("Got client data:%v", rData))
|
||||
c.Write(rData)
|
||||
} else {
|
||||
logger.LogErr("!!! ERROR reading from hc.tuns[] channel !!!")
|
||||
logger.LogDebug("!!! ERROR reading from hc.tuns[] channel !!!")
|
||||
break
|
||||
}
|
||||
}
|
||||
}()
|
||||
|
||||
}
|
||||
*/
|
||||
}
|
||||
|
|
|
|||
|
|
@ -346,12 +346,47 @@ func reqTunnel(hc *hkexnet.Conn, lp uint16, p string /*net.Addr*/, rp uint16) {
|
|||
var bTmp bytes.Buffer
|
||||
binary.Write(&bTmp, binary.BigEndian, lp)
|
||||
binary.Write(&bTmp, binary.BigEndian, rp)
|
||||
fmt.Printf("bTmp:%x\n", bTmp.Bytes())
|
||||
logger.LogDebug(fmt.Sprintln("[Client sending CSOTunSetup]"))
|
||||
hc.WritePacket(bTmp.Bytes(), hkexnet.CSOTunSetup)
|
||||
// hkexnet.WritePacket() handles processing of client side tun setup,
|
||||
// calling hkexnet.StartClientTunnel()
|
||||
|
||||
// Server should reply immediately with CSOTunSetupAck[lport:rport]
|
||||
// hkexnet.Read() on server side handles server side tun setup.
|
||||
|
||||
// CSOTun packets don't reply with acks/naks in the datastream; they
|
||||
// record the last status (other than CSOTunData) in the TunEndpoint
|
||||
// .Status field. We can check this here to determine how the request
|
||||
// completed.
|
||||
// TODO: Should be a timeout check here of course to avoid hangs...
|
||||
hc.InitTunEndpoint(lp, p, rp)
|
||||
resp := make([]byte, 4)
|
||||
var lpResp, rpResp uint16
|
||||
n, e := io.ReadFull(hc, resp)
|
||||
if n < 4 || e != nil {
|
||||
logger.LogErr(fmt.Sprintf("[Client tun response len %d, %s\n", n, e))
|
||||
} else {
|
||||
lpResp = binary.BigEndian.Uint16(resp[0:2])
|
||||
rpResp = binary.BigEndian.Uint16(resp[2:4])
|
||||
//var s byte
|
||||
//for timeout := 0; timeout < 5; timeout++ {
|
||||
// s = hc.GetTunStatus(rp)
|
||||
// if s != hkexnet.CSOTunSetup {
|
||||
// logger.LogDebug(fmt.Sprintf("[Client tun setup result:%d\n]", s))
|
||||
// break
|
||||
// }
|
||||
// time.Sleep(1 * time.Second)
|
||||
//}
|
||||
}
|
||||
|
||||
if lpResp == lp && rpResp == rp {
|
||||
logger.LogDebug("[Client got tun setup ack OK]")
|
||||
hc.StartClientTunnel(lp, rp)
|
||||
} else {
|
||||
logger.LogDebug(fmt.Sprintf("[Client tun response ports [%d:%d]\n", lpResp, rpResp))
|
||||
logger.LogDebug(fmt.Sprintln("[Client tun setup FAILED]"))
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
|
|
@ -492,8 +527,8 @@ func main() {
|
|||
// either the shell session or copy operation.
|
||||
_ = shellMode
|
||||
|
||||
Log, _ = logger.New(logger.LOG_USER|logger.LOG_DEBUG, "hkexsh")
|
||||
hkexnet.Init(dbg, "hkexsh", logger.LOG_USER|logger.LOG_DEBUG)
|
||||
Log, _ = logger.New(logger.LOG_USER|logger.LOG_DEBUG|logger.LOG_NOTICE|logger.LOG_ERR, "hkexsh")
|
||||
hkexnet.Init(dbg, "hkexsh", logger.LOG_USER|logger.LOG_DEBUG|logger.LOG_NOTICE|logger.LOG_ERR)
|
||||
if dbg {
|
||||
log.SetOutput(Log)
|
||||
} else {
|
||||
|
|
|
|||
|
|
@ -387,8 +387,8 @@ func main() {
|
|||
}
|
||||
}
|
||||
|
||||
Log, _ = logger.New(logger.LOG_DAEMON|logger.LOG_DEBUG, "hkexshd")
|
||||
hkexnet.Init(dbg, "hkexshd", logger.LOG_DAEMON|logger.LOG_DEBUG)
|
||||
Log, _ = logger.New(logger.LOG_DAEMON|logger.LOG_DEBUG|logger.LOG_NOTICE|logger.LOG_ERR, "hkexshd")
|
||||
hkexnet.Init(dbg, "hkexshd", logger.LOG_DAEMON|logger.LOG_DEBUG|logger.LOG_NOTICE|logger.LOG_ERR)
|
||||
if dbg {
|
||||
log.SetOutput(Log)
|
||||
} else {
|
||||
|
|
|
|||
Loading…
Reference in New Issue