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connection.go
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connection.go
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/*
Copyright NetFoundry Inc.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
https://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package xgress_common
import (
"github.com/michaelquigley/pfxlog"
"github.com/openziti/secretstream"
"github.com/openziti/secretstream/kx"
"github.com/openziti/channel/v2"
"github.com/openziti/ziti/router/xgress"
"github.com/openziti/foundation/v2/concurrenz"
"github.com/openziti/foundation/v2/info"
"github.com/openziti/sdk-golang/ziti/edge"
"github.com/openziti/sdk-golang/ziti/edge/network"
"github.com/pkg/errors"
log "github.com/sirupsen/logrus"
"io"
"net"
)
const (
closedFlag = 0
sentFinFlag = 1
recvFinFlag = 2
outOfBandTxFlag = 3
halfCloseFlag = 4
writeClosedFlag = 5
xgressTypeFlag = 6
)
const (
DefaultBufferSize = 10 * 1024
)
type outOfBand struct {
data []byte
headers map[uint8][]byte
}
type XgressConn struct {
net.Conn
rxKey []byte
outOfBandTx chan *outOfBand
receiver secretstream.Decryptor
sender secretstream.Encryptor
writeDone chan struct{}
flags concurrenz.AtomicBitSet
bufferSize int
}
func NewXgressConn(conn net.Conn, halfClose bool, isTransport bool) *XgressConn {
result := &XgressConn{
Conn: conn,
outOfBandTx: make(chan *outOfBand, 1),
writeDone: make(chan struct{}),
bufferSize: DefaultBufferSize,
}
if _, isUdpConn := conn.(*net.UDPConn); isUdpConn {
result.bufferSize = info.MaxUdpPacketSize
}
result.flags.Set(halfCloseFlag, halfClose)
result.flags.Set(xgressTypeFlag, isTransport)
return result
}
func (self *XgressConn) CloseWrite() error {
if self.flags.IsSet(halfCloseFlag) {
if self.flags.CompareAndSet(sentFinFlag, false, true) {
self.outOfBandTx <- &outOfBand{
headers: GetFinHeaders(),
}
self.flags.Set(outOfBandTxFlag, true)
}
return nil
}
return self.Close()
}
func (self *XgressConn) SetupClientCrypto(keyPair *kx.KeyPair, peerKey []byte) error {
return self.setupCrypto(keyPair, peerKey, true)
}
func (self *XgressConn) SetupServerCrypto(peerKey []byte) ([]byte, error) {
keyPair, err := kx.NewKeyPair()
if err != nil {
return nil, errors.Wrap(err, "unable to setup encryption for connection")
}
if err = self.setupCrypto(keyPair, peerKey, false); err != nil {
return nil, err
}
return keyPair.Public(), nil
}
func (self *XgressConn) setupCrypto(keyPair *kx.KeyPair, peerKey []byte, client bool) error {
var rx, tx []byte
var err error
if client {
if rx, tx, err = keyPair.ClientSessionKeys(peerKey); err != nil {
return errors.Wrap(err, "failed key exchange")
}
} else {
if rx, tx, err = keyPair.ServerSessionKeys(peerKey); err != nil {
return errors.Wrap(err, "failed key exchange")
}
}
var txHeader []byte
if self.sender, txHeader, err = secretstream.NewEncryptor(tx); err != nil {
return errors.Wrap(err, "failed to establish crypto stream")
}
self.outOfBandTx <- &outOfBand{data: txHeader}
self.flags.Set(outOfBandTxFlag, true)
self.rxKey = rx
pfxlog.Logger().Debug("crypto established")
return nil
}
func (self *XgressConn) LogContext() string {
if self == nil {
return "xgress-conn/nil"
}
if self.Conn == nil {
return "xgress-conn/no-conn"
}
if self.Conn.RemoteAddr() == nil {
return "xgress-conn/no-addr"
}
return self.Conn.RemoteAddr().String()
}
func (self *XgressConn) IsClosed() bool {
return self.flags.IsSet(closedFlag)
}
func (self *XgressConn) IsWriteClosed() bool {
return self.flags.IsSet(sentFinFlag)
}
func (self *XgressConn) ReadPayload() ([]byte, map[uint8][]byte, error) {
// First thing we need to do is send the encryption header, if one exists
if self.flags.Load() != 0 {
if self.flags.IsSet(outOfBandTxFlag) {
var oob *outOfBand
select {
case oob = <-self.outOfBandTx:
return oob.data, oob.headers, nil
default:
self.flags.Set(outOfBandTxFlag, false)
}
}
if self.IsWriteClosed() {
<-self.writeDone
return nil, nil, io.EOF
}
if self.IsClosed() {
return nil, nil, io.EOF
}
}
buffer := make([]byte, self.bufferSize)
n, err := self.Conn.Read(buffer)
buffer = buffer[:n]
if self.sender != nil && n > 0 {
var cryptoErr error
buffer, cryptoErr = self.sender.Push(buffer, secretstream.TagMessage)
if cryptoErr != nil {
if err == nil {
err = cryptoErr
} else {
err = network.MultipleErrors{err, cryptoErr}
}
}
}
if err != nil && n == 0 && errors.Is(err, io.EOF) && self.flags.IsSet(halfCloseFlag) {
if self.flags.CompareAndSet(sentFinFlag, false, true) {
return nil, GetFinHeaders(), nil
}
}
return buffer, nil, err
}
func (self *XgressConn) WritePayload(p []byte, headers map[uint8][]byte) (int, error) {
if self.flags.IsSet(recvFinFlag) {
return 0, errors.New("calling WritePayload() after CloseWrite()")
}
if flags, found := headers[PayloadFlagsHeader]; found {
if flags[0]&edge.FIN != 0 {
defer func() {
conn, ok := self.Conn.(edge.CloseWriter)
// if connection does not support half-close just let xgress tear it down
if ok {
_ = conn.CloseWrite()
} else {
_ = self.Conn.Close()
}
self.notifyWriteDone()
}()
}
}
var err error
// first data message should contain crypto header
if self.rxKey != nil {
if len(p) != secretstream.StreamHeaderBytes {
return 0, errors.Errorf("failed to receive crypto header bytes: read[%d]", len(p))
}
self.receiver, err = secretstream.NewDecryptor(self.rxKey, p)
self.rxKey = nil
return len(p), err
}
if len(p) > 0 {
buf := p
if self.receiver != nil {
buf, _, err = self.receiver.Pull(p)
if err != nil {
log.WithError(err).Errorf("crypto failed on msg of size=%v, headers=%+v", len(p), headers)
return 0, err
}
}
_, err = self.Write(buf)
if err != nil {
_ = self.Close()
}
return len(p), err
}
return 0, nil
}
func (self *XgressConn) notifyWriteDone() {
if self.flags.CompareAndSet(writeClosedFlag, false, true) {
self.flags.Set(recvFinFlag, true)
close(self.writeDone)
}
}
func (self *XgressConn) Close() error {
if self.flags.CompareAndSet(closedFlag, false, true) {
self.notifyWriteDone()
return self.Conn.Close()
}
return nil
}
func (self *XgressConn) HandleControlMsg(controlType xgress.ControlType, headers channel.Headers, responder xgress.ControlReceiver) error {
if controlType == xgress.ControlTypeTraceRoute {
hopType := "xgress/edge_transport"
if !self.flags.IsSet(xgressTypeFlag) {
hopType = "xgress/tunnel"
}
// TODO: find a way to get terminator id for hopId
xgress.RespondToTraceRequest(headers, hopType, "", responder)
return nil
}
return errors.Errorf("unhandled control type: %v", controlType)
}