From c4ed26526e2539b8e6190568f1251d395e82c389 Mon Sep 17 00:00:00 2001 From: William Petit Date: Wed, 21 Oct 2020 18:00:15 +0200 Subject: [PATCH] chore: initial commit --- .gitignore | 1 + Makefile | 13 ++ client.go | 136 +++++++++++++++++++ client_config.go | 53 ++++++++ cmd/client/main.go | 65 +++++++++ cmd/server/main.go | 87 +++++++++++++ cmd/server/registry.go | 77 +++++++++++ control/auth.go | 9 ++ control/control.go | 167 ++++++++++++++++++++++++ control/error.go | 7 + control/handler.go | 7 + control/message.go | 73 +++++++++++ control/proxy.go | 6 + error.go | 12 ++ go.mod | 19 +++ go.sum | 290 +++++++++++++++++++++++++++++++++++++++++ helper.go | 26 ++++ modd.conf | 7 + remote_client.go | 130 ++++++++++++++++++ server.go | 63 +++++++++ server_config.go | 69 ++++++++++ server_hook.go | 59 +++++++++ 22 files changed, 1376 insertions(+) create mode 100644 .gitignore create mode 100644 Makefile create mode 100644 client.go create mode 100644 client_config.go create mode 100644 cmd/client/main.go create mode 100644 cmd/server/main.go create mode 100644 cmd/server/registry.go create mode 100644 control/auth.go create mode 100644 control/control.go create mode 100644 control/error.go create mode 100644 control/handler.go create mode 100644 control/message.go create mode 100644 control/proxy.go create mode 100644 error.go create mode 100644 go.mod create mode 100644 go.sum create mode 100644 helper.go create mode 100644 modd.conf create mode 100644 remote_client.go create mode 100644 server.go create mode 100644 server_config.go create mode 100644 server_hook.go diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..7447f89 --- /dev/null +++ b/.gitignore @@ -0,0 +1 @@ +/bin \ No newline at end of file diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..792bc00 --- /dev/null +++ b/Makefile @@ -0,0 +1,13 @@ +watch: + modd + +build: build-server build-client + +build-server: + go build -o ./bin/server ./cmd/server + +build-client: + go build -o ./bin/client ./cmd/client + +test: + go test -v -race ./... \ No newline at end of file diff --git a/client.go b/client.go new file mode 100644 index 0000000..ae841f4 --- /dev/null +++ b/client.go @@ -0,0 +1,136 @@ +package tunnel + +import ( + "context" + "io" + "net" + "net/http" + + "gitlab.com/wpetit/goweb/logger" + + "forge.cadoles.com/wpetit/go-tunnel/control" + "github.com/pkg/errors" + "github.com/xtaci/kcp-go/v5" + "github.com/xtaci/smux" +) + +type Client struct { + conf *ClientConfig + conn *kcp.UDPSession + sess *smux.Session + control *control.Control + http *http.Client +} + +func (c *Client) Connect(ctx context.Context) error { + conn, err := kcp.DialWithOptions( + c.conf.ServerAddress, c.conf.BlockCrypt, + c.conf.DataShards, c.conf.ParityShards, + ) + if err != nil { + return errors.WithStack(err) + } + + conn.SetWriteDelay(false) + + config := smux.DefaultConfig() + config.Version = 2 + + sess, err := smux.Client(conn, config) + if err != nil { + return errors.WithStack(err) + } + + controlStream, err := sess.OpenStream() + if err != nil { + return errors.WithStack(err) + } + + c.conn = conn + c.sess = sess + c.control = control.New(sess, controlStream) + + logger.Debug(ctx, "sending auth request") + + success, err := c.control.AuthRequest(c.conf.Credentials) + if err != nil { + return errors.WithStack(err) + } + + if !success { + defer c.Close() + return errors.WithStack(ErrAuthFailed) + } + + return nil +} + +func (c *Client) Listen(ctx context.Context) error { + logger.Debug(ctx, "listening for messages") + + err := c.control.Listen(ctx, control.Handlers{ + control.TypeProxyRequest: c.handleProxyRequest, + }) + + if errors.Is(err, io.ErrClosedPipe) { + logger.Debug(ctx, "client connection closed") + + return errors.WithStack(ErrConnectionClosed) + } + + return err +} + +func (c *Client) Close() error { + if c.conn == nil { + return errors.WithStack(ErrNotConnected) + } + + if err := c.conn.Close(); err != nil { + return errors.WithStack(err) + } + + if c.sess != nil && !c.sess.IsClosed() { + if err := c.sess.Close(); err != nil { + return errors.WithStack(err) + } + } + + return nil +} + +func (c *Client) handleProxyRequest(ctx context.Context, m *control.Message) (*control.Message, error) { + proxyReqPayload, ok := m.Payload.(*control.ProxyRequestPayload) + if !ok { + return nil, errors.WithStack(ErrUnexpectedMessage) + } + + stream, err := c.sess.OpenStream() + if err != nil { + return nil, errors.WithStack(err) + } + + defer stream.Close() + + net, err := net.Dial(proxyReqPayload.Network, proxyReqPayload.Address) + if err != nil { + return nil, errors.WithStack(err) + } + + pipe(stream, net) + + return nil, nil +} + +func NewClient(funcs ...ClientConfigFunc) *Client { + conf := DefaultClientConfig() + + for _, fn := range funcs { + fn(conf) + } + + return &Client{ + conf: conf, + http: &http.Client{}, + } +} diff --git a/client_config.go b/client_config.go new file mode 100644 index 0000000..7e5abe5 --- /dev/null +++ b/client_config.go @@ -0,0 +1,53 @@ +package tunnel + +import ( + "crypto/sha1" + + "github.com/pkg/errors" + "github.com/xtaci/kcp-go/v5" + "golang.org/x/crypto/pbkdf2" +) + +type ClientConfig struct { + ServerAddress string + BlockCrypt kcp.BlockCrypt + DataShards int + ParityShards int + Credentials interface{} +} + +func DefaultClientConfig() *ClientConfig { + unencryptedBlock, err := kcp.NewNoneBlockCrypt(nil) + if err != nil { // should never happen + panic(errors.WithStack(err)) + } + + return &ClientConfig{ + ServerAddress: "127.0.0.1:36543", + BlockCrypt: unencryptedBlock, + DataShards: 3, + ParityShards: 10, + Credentials: nil, + } +} + +func WithClientCredentials(credentials interface{}) ClientConfigFunc { + return func(conf *ClientConfig) { + conf.Credentials = credentials + } +} + +func WithClientAESBlockCrypt(pass, salt string) ClientConfigFunc { + return func(conf *ClientConfig) { + key := pbkdf2.Key([]byte(pass), []byte(salt), 1024, 32, sha1.New) + + block, err := kcp.NewAESBlockCrypt(key) + if err != nil { + panic(errors.WithStack(err)) + } + + conf.BlockCrypt = block + } +} + +type ClientConfigFunc func(c *ClientConfig) diff --git a/cmd/client/main.go b/cmd/client/main.go new file mode 100644 index 0000000..fe4888f --- /dev/null +++ b/cmd/client/main.go @@ -0,0 +1,65 @@ +package main + +import ( + "context" + "flag" + "math/rand" + "time" + + "cdr.dev/slog" + "forge.cadoles.com/wpetit/go-tunnel" + "gitlab.com/wpetit/goweb/logger" +) + +const sharedKey = "go-tunnel" +const salt = "go-tunnel" + +func main() { + var ( + clientID string + ) + + flag.StringVar(&clientID, "id", "", "Client ID") + flag.Parse() + + ctx := context.Background() + ctx = logger.With(ctx, logger.F("clientID", clientID)) + + logger.SetLevel(slog.LevelDebug) + + client := tunnel.NewClient( + tunnel.WithClientCredentials(clientID), + tunnel.WithClientAESBlockCrypt(sharedKey, salt), + ) + defer client.Close() + + initialBackoff := time.Second * 10 + backoff := initialBackoff + + sleep := func() { + backoff = backoff*2 + (time.Duration(rand.Intn(int(initialBackoff)))) + + logger.Info(ctx, "sleeping", logger.F("duration", backoff)) + time.Sleep(backoff) + } + + for { + logger.Info(ctx, "connecting") + + if err := client.Connect(ctx); err != nil { + logger.Error(ctx, "could not connect", logger.E(err)) + sleep() + + continue + } + + logger.Info(ctx, "waiting for instructions") + + if err := client.Listen(ctx); err != nil { + logger.Error(ctx, "error while listening", logger.E(err)) + } + + logger.Info(ctx, "connection lost") + sleep() + } +} diff --git a/cmd/server/main.go b/cmd/server/main.go new file mode 100644 index 0000000..28aaeef --- /dev/null +++ b/cmd/server/main.go @@ -0,0 +1,87 @@ +package main + +import ( + "context" + "net" + "net/http" + "net/http/httputil" + "net/url" + "strings" + "time" + + "cdr.dev/slog" + "forge.cadoles.com/wpetit/go-tunnel" + "github.com/pkg/errors" + "gitlab.com/wpetit/goweb/logger" +) + +const sharedKey = "go-tunnel" +const salt = "go-tunnel" + +var registry = NewRegistry() + +func main() { + ctx := context.Background() + + logger.SetLevel(slog.LevelDebug) + + server := tunnel.NewServer( + tunnel.WithServerAESBlockCrypt(sharedKey, salt), + tunnel.WithServerOnClientAuth(registry.OnClientAuth), + tunnel.WithServerOnClientDisconnect(registry.OnClientDisconnect), + ) + + go func() { + if err := server.Listen(ctx); err != nil { + logger.Fatal(ctx, "error while listening", logger.E(err)) + } + }() + + if err := http.ListenAndServe(":3003", http.HandlerFunc(handleRequest)); err != nil { + logger.Fatal(ctx, "error while listening", logger.E(err)) + } +} + +func handleRequest(w http.ResponseWriter, r *http.Request) { + subdomains := strings.SplitN(r.Host, ".", 2) + + if len(subdomains) < 2 { + http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound) + + return + } + + clientID := subdomains[0] + remoteClient := registry.Get(clientID) + + if remoteClient == nil { + http.Error(w, http.StatusText(http.StatusBadGateway), http.StatusBadGateway) + + return + } + + target, err := url.Parse("http://localhost:3000") + if err != nil { + logger.Fatal(r.Context(), "could not parse url", logger.E(err)) + } + + reverse := httputil.NewSingleHostReverseProxy(target) + reverse.Transport = &http.Transport{ + Proxy: http.ProxyFromEnvironment, + DialContext: func(ctx context.Context, network string, addr string) (net.Conn, error) { + conn, err := remoteClient.Proxy(ctx, network, addr) + if err != nil { + return nil, errors.WithStack(err) + } + + return conn, nil + }, + ForceAttemptHTTP2: true, + MaxIdleConns: 100, + IdleConnTimeout: 90 * time.Second, + TLSHandshakeTimeout: 10 * time.Second, + ExpectContinueTimeout: 1 * time.Second, + } + + reverse.ServeHTTP(w, r) +} diff --git a/cmd/server/registry.go b/cmd/server/registry.go new file mode 100644 index 0000000..0c2cde8 --- /dev/null +++ b/cmd/server/registry.go @@ -0,0 +1,77 @@ +package main + +import ( + "context" + "errors" + + "forge.cadoles.com/wpetit/go-tunnel" + cmap "github.com/streamrail/concurrent-map" +) + +type Registry struct { + clientIDByRemoteAddr cmap.ConcurrentMap + clientByClientID cmap.ConcurrentMap +} + +func (r *Registry) OnClientAuth(ctx context.Context, rc *tunnel.RemoteClient, credentials interface{}) (bool, error) { + clientID, ok := credentials.(string) + if !ok { + return false, errors.New("unexpected credentials") + } + + remoteAddr := rc.RemoteAddr().String() + + r.Add(clientID, remoteAddr, rc) + + return true, nil +} + +func (r *Registry) OnClientDisconnect(ctx context.Context, rc *tunnel.RemoteClient) error { + remoteAddr := rc.RemoteAddr().String() + + r.RemoveByRemoteAddr(remoteAddr) + + return nil +} + +func (r *Registry) Get(clientID string) *tunnel.RemoteClient { + rawRemoteClient, exists := r.clientByClientID.Get(clientID) + if !exists { + return nil + } + + remoteClient, ok := rawRemoteClient.(*tunnel.RemoteClient) + if !ok { + return nil + } + + return remoteClient +} + +func (r *Registry) Add(clientID, remoteAddr string, rc *tunnel.RemoteClient) { + r.clientByClientID.Set(clientID, rc) + r.clientIDByRemoteAddr.Set(remoteAddr, clientID) +} + +func (r *Registry) RemoveByRemoteAddr(remoteAddr string) { + rawClientID, exists := r.clientIDByRemoteAddr.Get(remoteAddr) + if !exists { + return + } + + r.clientIDByRemoteAddr.Remove(remoteAddr) + + clientID, ok := rawClientID.(string) + if !ok { + return + } + + r.clientByClientID.Remove(clientID) +} + +func NewRegistry() *Registry { + return &Registry{ + clientIDByRemoteAddr: cmap.New(), + clientByClientID: cmap.New(), + } +} diff --git a/control/auth.go b/control/auth.go new file mode 100644 index 0000000..b965617 --- /dev/null +++ b/control/auth.go @@ -0,0 +1,9 @@ +package control + +type AuthRequestPayload struct { + Credentials interface{} `json:"c"` +} + +type AuthResponsePayload struct { + Success bool `json:"s"` +} diff --git a/control/control.go b/control/control.go new file mode 100644 index 0000000..4dcd07d --- /dev/null +++ b/control/control.go @@ -0,0 +1,167 @@ +package control + +import ( + "context" + "encoding/json" + "net" + "time" + + "github.com/pkg/errors" + "github.com/xtaci/smux" + "gitlab.com/wpetit/goweb/logger" +) + +type Control struct { + encoder *json.Encoder + decoder *json.Decoder + stream *smux.Stream + sess *smux.Session +} + +func (c *Control) AuthRequest(credentials interface{}) (bool, error) { + req := NewMessage(TypeAuthRequest, &AuthRequestPayload{ + Credentials: credentials, + }) + + res := NewMessage(TypeAuthResponse, nil) + + if err := c.reqRes(req, res); err != nil { + return false, errors.WithStack(err) + } + + authResPayload, ok := res.Payload.(*AuthResponsePayload) + if !ok { + return false, errors.WithStack(ErrUnexpectedMessage) + } + + return authResPayload.Success, nil +} + +type CloseStream func() + +func (c *Control) Proxy(ctx context.Context, network, address string) (net.Conn, error) { + var ( + stream *smux.Stream + err error + ) + + req := NewMessage(TypeProxyRequest, &ProxyRequestPayload{ + Network: network, + Address: address, + }) + + ctx = logger.With(ctx, logger.F("network", network), logger.F("address", address)) + + logger.Debug(ctx, "proxying") + + if err := c.Write(req); err != nil { + return nil, errors.WithStack(err) + } + + logger.Debug(ctx, "opening stream") + + stream, err = c.sess.AcceptStream() + if err != nil { + return nil, errors.WithStack(err) + } + + return stream, nil +} + +func (c *Control) Listen(ctx context.Context, handlers Handlers) error { + for { + logger.Debug(ctx, "reading next message") + + req, err := c.Read() + if err != nil { + return errors.WithStack(err) + } + + go func() { + subCtx := logger.With(ctx, logger.F("messageType", req.Type)) + + handler, exists := handlers[req.Type] + if !exists { + logger.Error(subCtx, "no message handler registered") + + return + } + + res, err := handler(subCtx, req) + if err != nil { + logger.Error(subCtx, "error while handling message", logger.E(err)) + + return + } + + if res == nil { + return + } + + if err := c.Write(res); err != nil { + logger.Error(subCtx, "error while write message response", logger.E(err)) + + return + } + }() + } +} + +func (c *Control) Read() (*Message, error) { + message := &Message{} + + if err := c.read(message); err != nil { + return nil, errors.WithStack(err) + } + + return message, nil +} + +func (c *Control) Write(m *Message) error { + if err := c.write(m); err != nil { + return errors.WithStack(err) + } + + return nil +} + +func (c *Control) reqRes(req *Message, res *Message) error { + if err := c.write(req); err != nil { + return errors.WithStack(err) + } + + if err := c.read(res); err != nil { + return errors.WithStack(err) + } + + return nil +} + +func (c *Control) read(m *Message) error { + if err := c.decoder.Decode(m); err != nil { + return errors.WithStack(err) + } + + return nil +} + +func (c *Control) write(m *Message) error { + if err := c.stream.SetWriteDeadline(time.Now().Add(time.Second)); err != nil { + return errors.WithStack(err) + } + + if err := c.encoder.Encode(m); err != nil { + return errors.WithStack(err) + } + + return nil +} + +func New(sess *smux.Session, controlStream *smux.Stream) *Control { + return &Control{ + encoder: json.NewEncoder(controlStream), + decoder: json.NewDecoder(controlStream), + sess: sess, + stream: controlStream, + } +} diff --git a/control/error.go b/control/error.go new file mode 100644 index 0000000..72c87c8 --- /dev/null +++ b/control/error.go @@ -0,0 +1,7 @@ +package control + +import "errors" + +var ( + ErrUnexpectedMessage = errors.New("unexpected message") +) diff --git a/control/handler.go b/control/handler.go new file mode 100644 index 0000000..0028c0b --- /dev/null +++ b/control/handler.go @@ -0,0 +1,7 @@ +package control + +import "context" + +type Handlers map[MessageType]MessageHandler + +type MessageHandler func(ctx context.Context, m *Message) (*Message, error) diff --git a/control/message.go b/control/message.go new file mode 100644 index 0000000..fd8e05a --- /dev/null +++ b/control/message.go @@ -0,0 +1,73 @@ +package control + +import ( + "encoding/json" + + "github.com/pkg/errors" +) + +const ( + TypeAuthRequest MessageType = "auth-req" + TypeAuthResponse MessageType = "auth-res" + TypeProxyRequest MessageType = "proxy-req" +) + +type MessageType string + +type BaseMessage struct { + Type MessageType `json:"t"` + RawPayload json.RawMessage `json:"p"` +} + +type Message struct { + BaseMessage + Payload interface{} `json:"p"` +} + +func (m *Message) UnmarshalJSON(data []byte) error { + base := &BaseMessage{} + + if err := json.Unmarshal(data, base); err != nil { + return errors.WithStack(err) + } + + payload, err := unmarshalPayload(base.Type, base.RawPayload) + if err != nil { + return errors.WithStack(err) + } + + m.Type = base.Type + m.Payload = payload + + return nil +} + +func NewMessage(mType MessageType, payload interface{}) *Message { + return &Message{ + BaseMessage: BaseMessage{ + Type: mType, + }, + Payload: payload, + } +} + +func unmarshalPayload(mType MessageType, data []byte) (interface{}, error) { + var payload interface{} + + switch mType { + case TypeAuthRequest: + payload = &AuthRequestPayload{} + case TypeAuthResponse: + payload = &AuthResponsePayload{} + case TypeProxyRequest: + payload = &ProxyRequestPayload{} + default: + return nil, errors.Wrapf(ErrUnexpectedMessage, "unexpected message type '%s'", mType) + } + + if err := json.Unmarshal(data, payload); err != nil { + return nil, errors.WithStack(err) + } + + return payload, nil +} diff --git a/control/proxy.go b/control/proxy.go new file mode 100644 index 0000000..1863325 --- /dev/null +++ b/control/proxy.go @@ -0,0 +1,6 @@ +package control + +type ProxyRequestPayload struct { + Network string `json:"n"` + Address string `json:"a"` +} diff --git a/error.go b/error.go new file mode 100644 index 0000000..31af0a7 --- /dev/null +++ b/error.go @@ -0,0 +1,12 @@ +package tunnel + +import "errors" + +var ( + ErrNotConnected = errors.New("not connected") + ErrCouldNotConnect = errors.New("could not connect") + ErrConnectionClosed = errors.New("connection closed") + ErrAuthFailed = errors.New("auth failed") + ErrUnexpectedMessage = errors.New("unexpected message") + ErrUnexpectedResponse = errors.New("unexpected response") +) diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..8d7b26b --- /dev/null +++ b/go.mod @@ -0,0 +1,19 @@ +module forge.cadoles.com/wpetit/go-tunnel + +go 1.15 + +require ( + cdr.dev/slog v1.3.0 + github.com/davecgh/go-spew v1.1.1 + github.com/orcaman/concurrent-map v0.0.0-20190826125027-8c72a8bb44f6 + github.com/pkg/errors v0.9.1 + github.com/streamrail/concurrent-map v0.0.0-20160823150647-8bf1e9bacbf6 + github.com/templexxx/cpufeat v0.0.0-20180724012125-cef66df7f161 // indirect + github.com/templexxx/xor v0.0.0-20191217153810-f85b25db303b // indirect + github.com/xtaci/kcp-go v5.4.20+incompatible + github.com/xtaci/kcp-go/v5 v5.6.1 + github.com/xtaci/smux v1.5.14 + github.com/xtaci/smux/v2 v2.1.0 + gitlab.com/wpetit/goweb v0.0.0-20200707070104-985ce3eba3c2 + golang.org/x/crypto v0.0.0-20200728195943-123391ffb6de +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..e32d4f0 --- /dev/null +++ b/go.sum @@ -0,0 +1,290 @@ +cdr.dev/slog v1.3.0 h1:MYN1BChIaVEGxdS7I5cpdyMC0+WfJfK8BETAfzfLUGQ= +cdr.dev/slog v1.3.0/go.mod h1:C5OL99WyuOK8YHZdYY57dAPN1jK2WJlCdq2VP6xeQns= +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU= +cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU= +cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY= +cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc= 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b/helper.go new file mode 100644 index 0000000..d3f5eb8 --- /dev/null +++ b/helper.go @@ -0,0 +1,26 @@ +package tunnel + +import ( + "io" + "net" +) + +func pipe(client net.Conn, server net.Conn) { + stop := make(chan bool) + + go relay(client, server, stop) + go relay(server, client, stop) + + select { + case <-stop: + return + } +} + +func relay(src net.Conn, dst net.Conn, stop chan bool) { + io.Copy(dst, src) + dst.Close() + src.Close() + stop <- true + return +} diff --git a/modd.conf b/modd.conf new file mode 100644 index 0000000..2991f97 --- /dev/null +++ b/modd.conf @@ -0,0 +1,7 @@ +**/*.go { + prep: make test + prep: make build + daemon: ./bin/server + daemon: ./bin/client -id client1 + daemon: ./bin/client -id client2 +} \ No newline at end of file diff --git a/remote_client.go b/remote_client.go new file mode 100644 index 0000000..6b75d41 --- /dev/null +++ b/remote_client.go @@ -0,0 +1,130 @@ +package tunnel + +import ( + "context" + "io" + "net" + + "forge.cadoles.com/wpetit/go-tunnel/control" + + "github.com/pkg/errors" + "github.com/xtaci/kcp-go/v5" + "github.com/xtaci/smux" + "gitlab.com/wpetit/goweb/logger" +) + +type RemoteClient struct { + onClientAuthHook OnClientAuthHook + onClientConnectHook OnClientConnectHook + onClientDisconnectHook OnClientDisconnectHook + sess *smux.Session + control *control.Control + remoteAddr net.Addr +} + +func (c *RemoteClient) Accept(ctx context.Context, conn *kcp.UDPSession) error { + c.remoteAddr = conn.RemoteAddr() + + if c.onClientConnectHook != nil { + if err := c.onClientConnectHook.OnClientConnect(ctx, c); err != nil { + return errors.WithStack(err) + } + } + + config := smux.DefaultConfig() + config.Version = 2 + + sess, err := smux.Server(conn, config) + if err != nil { + return errors.WithStack(err) + } + + logger.Debug(ctx, "accepting control stream") + + controlStream, err := sess.AcceptStream() + if err != nil { + return errors.WithStack(err) + } + + c.sess = sess + c.control = control.New(sess, controlStream) + + return nil +} + +func (c *RemoteClient) Listen(ctx context.Context) error { + logger.Debug(ctx, "listening for messages") + + err := c.control.Listen(ctx, control.Handlers{ + control.TypeAuthRequest: c.handleAuthRequest, + }) + + if errors.Is(err, io.ErrClosedPipe) { + if c.onClientDisconnectHook != nil { + if err := c.onClientDisconnectHook.OnClientDisconnect(ctx, c); err != nil { + logger.Error(ctx, "client disconnect hook error", logger.E(err)) + } + } + + return errors.WithStack(ErrConnectionClosed) + } + + return err +} + +func (c *RemoteClient) handleAuthRequest(ctx context.Context, m *control.Message) (*control.Message, error) { + authReqPayload, ok := m.Payload.(*control.AuthRequestPayload) + if !ok { + return nil, errors.WithStack(ErrUnexpectedMessage) + } + + logger.Debug(ctx, "handling auth request", logger.F("credentials", authReqPayload.Credentials)) + + var ( + success bool + err error + ) + + if c.onClientAuthHook != nil { + success, err = c.onClientAuthHook.OnClientAuth(ctx, c, authReqPayload.Credentials) + if err != nil { + return nil, errors.WithStack(err) + } + } + + res := control.NewMessage(control.TypeAuthResponse, &control.AuthResponsePayload{ + Success: success, + }) + + return res, nil +} + +func (c *RemoteClient) ConfigureHooks(hooks interface{}) { + if hooks == nil { + return + } + + if onClientAuthHook, ok := hooks.(OnClientAuthHook); ok { + c.onClientAuthHook = onClientAuthHook + } + + if OnClientConnectHook, ok := hooks.(OnClientConnectHook); ok { + c.onClientConnectHook = OnClientConnectHook + } + + if OnClientDisconnectHook, ok := hooks.(OnClientDisconnectHook); ok { + c.onClientDisconnectHook = OnClientDisconnectHook + } +} + +func (c *RemoteClient) RemoteAddr() net.Addr { + return c.remoteAddr +} + +func (c *RemoteClient) Proxy(ctx context.Context, network, address string) (net.Conn, error) { + return c.control.Proxy(ctx, network, address) +} + +func NewRemoteClient() *RemoteClient { + return &RemoteClient{} +} diff --git a/server.go b/server.go new file mode 100644 index 0000000..bded495 --- /dev/null +++ b/server.go @@ -0,0 +1,63 @@ +package tunnel + +import ( + "context" + + cmap "github.com/orcaman/concurrent-map" + "github.com/pkg/errors" + "github.com/xtaci/kcp-go/v5" + "gitlab.com/wpetit/goweb/logger" +) + +type Server struct { + conf *ServerConfig + clients cmap.ConcurrentMap +} + +func (s *Server) Listen(ctx context.Context) error { + listener, err := kcp.ListenWithOptions( + s.conf.Address, s.conf.BlockCrypt, + s.conf.DataShards, s.conf.ParityShards, + ) + if err != nil { + return errors.WithStack(err) + } + + for { + conn, err := listener.AcceptKCP() + if err != nil { + return errors.WithStack(err) + } + + go s.handleNewConn(ctx, conn) + } +} + +func (s *Server) handleNewConn(ctx context.Context, conn *kcp.UDPSession) { + ctx = logger.With(ctx, logger.F("remoteAddr", conn.RemoteAddr().String())) + + remoteClient := NewRemoteClient() + + remoteClient.ConfigureHooks(s.conf.Hooks) + + if err := remoteClient.Accept(ctx, conn); err != nil { + logger.Error(ctx, "remote client error", logger.E(err)) + } + + if err := remoteClient.Listen(ctx); err != nil { + logger.Error(ctx, "remote client error", logger.E(err)) + } +} + +func NewServer(funcs ...ServerConfigFunc) *Server { + conf := DefaultServerConfig() + + for _, fn := range funcs { + fn(conf) + } + + return &Server{ + conf: conf, + clients: cmap.New(), + } +} diff --git a/server_config.go b/server_config.go new file mode 100644 index 0000000..e4113f7 --- /dev/null +++ b/server_config.go @@ -0,0 +1,69 @@ +package tunnel + +import ( + "crypto/sha1" + + "github.com/pkg/errors" + "github.com/xtaci/kcp-go/v5" + "golang.org/x/crypto/pbkdf2" +) + +type ServerConfig struct { + Address string + BlockCrypt kcp.BlockCrypt + DataShards int + ParityShards int + Hooks *ServerHooks +} + +func DefaultServerConfig() *ServerConfig { + unencryptedBlock, err := kcp.NewNoneBlockCrypt(nil) + if err != nil { // should never happen + panic(errors.WithStack(err)) + } + + return &ServerConfig{ + Address: ":36543", + BlockCrypt: unencryptedBlock, + DataShards: 3, + ParityShards: 10, + Hooks: &ServerHooks{ + onClientConnect: DefaultOnClientConnect, + onClientDisconnect: DefaultOnClientDisconnect, + onClientAuth: DefaultOnClientAuth, + }, + } +} + +type ServerConfigFunc func(c *ServerConfig) + +func WithServerAESBlockCrypt(pass, salt string) ServerConfigFunc { + return func(conf *ServerConfig) { + key := pbkdf2.Key([]byte(pass), []byte(salt), 1024, 32, sha1.New) + + block, err := kcp.NewAESBlockCrypt(key) + if err != nil { + panic(errors.WithStack(err)) + } + + conf.BlockCrypt = block + } +} + +func WithServerOnClientAuth(fn OnClientAuthFunc) ServerConfigFunc { + return func(conf *ServerConfig) { + conf.Hooks.onClientAuth = fn + } +} + +func WithServerOnClientConnect(fn OnClientConnectFunc) ServerConfigFunc { + return func(conf *ServerConfig) { + conf.Hooks.onClientConnect = fn + } +} + +func WithServerOnClientDisconnect(fn OnClientDisconnectFunc) ServerConfigFunc { + return func(conf *ServerConfig) { + conf.Hooks.onClientDisconnect = fn + } +} diff --git a/server_hook.go b/server_hook.go new file mode 100644 index 0000000..1bd5480 --- /dev/null +++ b/server_hook.go @@ -0,0 +1,59 @@ +package tunnel + +import ( + "context" + + "gitlab.com/wpetit/goweb/logger" +) + +type OnClientAuthFunc func(ctx context.Context, remoteClient *RemoteClient, credentials interface{}) (bool, error) + +type OnClientAuthHook interface { + OnClientAuth(ctx context.Context, remoteClient *RemoteClient, credentials interface{}) (bool, error) +} + +type OnClientConnectFunc func(ctx context.Context, remoteClient *RemoteClient) error + +type OnClientConnectHook interface { + OnClientConnect(ctx context.Context, remoteClient *RemoteClient) error +} + +type OnClientDisconnectFunc func(ctx context.Context, remoteClient *RemoteClient) error + +type OnClientDisconnectHook interface { + OnClientDisconnect(ctx context.Context, remoteClient *RemoteClient) error +} + +func DefaultOnClientAuth(ctx context.Context, remoteClient *RemoteClient, credentials interface{}) (bool, error) { + return true, nil +} + +func DefaultOnClientConnect(ctx context.Context, remoteClient *RemoteClient) error { + logger.Debug(ctx, "client connected") + + return nil +} + +func DefaultOnClientDisconnect(ctx context.Context, remoteClient *RemoteClient) error { + logger.Debug(ctx, "client disconnected") + + return nil +} + +type ServerHooks struct { + onClientAuth OnClientAuthFunc + onClientConnect OnClientConnectFunc + onClientDisconnect OnClientDisconnectFunc +} + +func (h *ServerHooks) OnClientAuth(ctx context.Context, remoteClient *RemoteClient, credentials interface{}) (bool, error) { + return h.onClientAuth(ctx, remoteClient, credentials) +} + +func (h *ServerHooks) OnClientConnect(ctx context.Context, remoteClient *RemoteClient) error { + return h.onClientConnect(ctx, remoteClient) +} + +func (h *ServerHooks) OnClientDisconnect(ctx context.Context, remoteClient *RemoteClient) error { + return h.onClientDisconnect(ctx, remoteClient) +}