Fix data races across session/forwarder/registry, resolve POST/PUT hang, harden port allocation, add frontendURL env (#157)

Reviewed-on: #157
Co-authored-by: Bagas <bagas@fossy.my.id>
Co-committed-by: Bagas <bagas@fossy.my.id>

README.md

@@ -36,6 +36,7 @@ The following environment variables can be configured in the `.env` file:
 | Variable            | Description                                                                 | Default                 | Required            |
 |---------------------|-----------------------------------------------------------------------------|-------------------------|---------------------|
 | `DOMAIN`            | Domain name for subdomain routing                                           | `localhost`             | No                  |
+| `FRONTEND_URL`      | URL for the frontend dashboard/landing page                                 | `https://<DOMAIN>`      | No                  |
 | `PORT`              | SSH server port                                                             | `2200`                  | No                  |
 | `HTTP_PORT`         | HTTP server port                                                            | `8080`                  | No                  |
 | `HTTPS_PORT`        | HTTPS server port                                                           | `8443`                  | No                  |

internal/bootstrap/bootstrap_test.go

@@ -80,6 +80,7 @@ type MockConfig struct {
 }
 
 func (m *MockConfig) Domain() string            { return m.Called().String(0) }
+func (m *MockConfig) FrontendURL() string       { return m.Called().String(0) }
 func (m *MockConfig) SSHPort() string           { return m.Called().String(0) }
 func (m *MockConfig) HTTPPort() string          { return m.Called().String(0) }
 func (m *MockConfig) HTTPSPort() string         { return m.Called().String(0) }

internal/config/config.go

@@ -6,6 +6,7 @@ import (
 
 type Config interface {
 	Domain() string
+	FrontendURL() string
 	SSHPort() string
 
 	HTTPPort() string
@@ -50,6 +51,7 @@ func MustLoad() (Config, error) {
 }
 
 func (c *config) Domain() string            { return c.domain }
+func (c *config) FrontendURL() string       { return c.frontendURL }
 func (c *config) SSHPort() string           { return c.sshPort }
 func (c *config) HTTPPort() string          { return c.httpPort }
 func (c *config) HTTPSPort() string         { return c.httpsPort }

internal/config/loader.go

@@ -12,8 +12,9 @@ import (
 )
 
 type config struct {
-	domain  string
+	domain      string
-	sshPort string
+	frontendURL string
+	sshPort     string
 
 	httpPort  string
 	httpsPort string
@@ -49,6 +50,7 @@ func parse() (*config, error) {
 	}
 
 	domain := getenv("DOMAIN", "localhost")
+	frontendURL := getenv("FRONTEND_URL", "https://"+domain)
 	sshPort := getenv("PORT", "2200")
 
 	httpPort := getenv("HTTP_PORT", "8080")
@@ -89,6 +91,7 @@ func parse() (*config, error) {
 
 	return &config{
 		domain:            domain,
+		frontendURL:       frontendURL,
 		sshPort:           sshPort,
 		httpPort:          httpPort,
 		httpsPort:         httpsPort,

internal/grpc/client/client_test.go

@@ -753,6 +753,7 @@ type MockConfig struct {
 }
 
 func (m *MockConfig) Domain() string            { return m.Called().String(0) }
+func (m *MockConfig) FrontendURL() string       { return m.Called().String(0) }
 func (m *MockConfig) SSHPort() string           { return m.Called().String(0) }
 func (m *MockConfig) HTTPPort() string          { return m.Called().String(0) }
 func (m *MockConfig) HTTPSPort() string         { return m.Called().String(0) }

internal/port/port.go

@@ -33,10 +33,15 @@ func (pm *port) AddRange(startPort, endPort uint16) error {
 	if startPort > endPort {
 		return fmt.Errorf("start port cannot be greater than end port")
 	}
-	for index := startPort; index <= endPort; index++ {
+	for index := startPort; ; index++ {
-		if _, exists := pm.ports[index]; !exists {
+		if index != 0 {
-			pm.ports[index] = false
+			if _, exists := pm.ports[index]; !exists {
-			pm.sortedPorts = append(pm.sortedPorts, index)
+				pm.ports[index] = false
+				pm.sortedPorts = append(pm.sortedPorts, index)
+			}
+		}
+		if index == endPort {
+			break
 		}
 	}
 	sort.Slice(pm.sortedPorts, func(i, j int) bool {
@@ -51,6 +56,7 @@ func (pm *port) Unassigned() (uint16, bool) {
 
 	for _, index := range pm.sortedPorts {
 		if !pm.ports[index] {
+			pm.ports[index] = true
 			return index, true
 		}
 	}
@@ -61,6 +67,9 @@ func (pm *port) SetStatus(port uint16, assigned bool) error {
 	pm.mu.Lock()
 	defer pm.mu.Unlock()
 
+	if _, exists := pm.ports[port]; !exists {
+		return fmt.Errorf("port %d is not in the allowed range", port)
+	}
 	pm.ports[port] = assigned
 	return nil
 }
@@ -70,16 +79,10 @@ func (pm *port) Claim(port uint16) (claimed bool) {
 	defer pm.mu.Unlock()
 
 	status, exists := pm.ports[port]
-
+	if !exists || status {
-	if exists && status {
 		return false
 	}
 
-	if !exists {
-		pm.ports[port] = true
-		return true
-	}
-
 	pm.ports[port] = true
 	return true
 }

internal/port/port_test.go

@@ -16,6 +16,8 @@ func TestAddRange(t *testing.T) {
 		{"normal range", 1000, 1002, false},
 		{"invalid range", 2000, 1999, true},
 		{"single port range", 3000, 3000, false},
+		{"range ending at max uint16", 65533, 65535, false},
+		{"range including port zero", 0, 2, false},
 	}
 
 	for _, tt := range tests {
@@ -31,6 +33,22 @@ func TestAddRange(t *testing.T) {
 	}
 }
 
+func TestAddRangeBoundaries(t *testing.T) {
+	pm := New()
+	err := pm.AddRange(0, 3)
+	assert.NoError(t, err)
+	_, hasZero := pm.(*port).ports[0]
+	assert.False(t, hasZero, "port 0 must be skipped")
+	assert.Len(t, pm.(*port).ports, 3)
+
+	pm2 := New()
+	err = pm2.AddRange(65533, 65535)
+	assert.NoError(t, err)
+	assert.Len(t, pm2.(*port).ports, 3)
+	_, hasMax := pm2.(*port).ports[65535]
+	assert.True(t, hasMax)
+}
+
 func TestUnassigned(t *testing.T) {
 	pm := New()
 	_ = pm.AddRange(1000, 1002)
@@ -58,6 +76,21 @@ func TestUnassigned(t *testing.T) {
 	}
 }
 
+func TestUnassignedReservesPort(t *testing.T) {
+	pm := New()
+	_ = pm.AddRange(1000, 1002)
+
+	p1, ok1 := pm.Unassigned()
+	assert.True(t, ok1)
+	assert.Equal(t, uint16(1000), p1)
+
+	p2, ok2 := pm.Unassigned()
+	assert.True(t, ok2)
+	assert.Equal(t, uint16(1001), p2)
+
+	assert.True(t, pm.(*port).ports[1000], "Unassigned must reserve the port")
+}
+
 func TestSetStatus(t *testing.T) {
 	pm := New()
 	_ = pm.AddRange(1000, 1002)
@@ -83,6 +116,17 @@ func TestSetStatus(t *testing.T) {
 	}
 }
 
+func TestSetStatusUnknownPort(t *testing.T) {
+	pm := New()
+	_ = pm.AddRange(1000, 1002)
+
+	err := pm.SetStatus(5000, true)
+	assert.Error(t, err)
+
+	_, exists := pm.(*port).ports[5000]
+	assert.False(t, exists, "SetStatus must not create entries for unknown ports")
+}
+
 func TestClaim(t *testing.T) {
 	pm := New()
 	_ = pm.AddRange(1000, 1002)
@@ -95,7 +139,7 @@ func TestClaim(t *testing.T) {
 	}{
 		{"claim unassigned port", 1000, false, true},
 		{"claim already assigned port", 1001, true, false},
-		{"claim non-existent port", 5000, false, true},
+		{"claim non-existent port", 5000, false, false},
 	}
 
 	for _, tt := range tests {
@@ -107,8 +151,13 @@ func TestClaim(t *testing.T) {
 			got := pm.Claim(tt.port)
 			assert.Equal(t, tt.want, got)
 
-			finalState := pm.(*port).ports[tt.port]
+			finalState, exists := pm.(*port).ports[tt.port]
-			assert.True(t, finalState)
+			if !tt.want && tt.port == 5000 {
+				assert.False(t, exists, "out-of-range port must not be added to the registry")
+			} else {
+				assert.True(t, exists)
+				assert.True(t, finalState)
+			}
 		})
 	}
 }

internal/registry/registry.go

@@ -94,13 +94,13 @@ func (r *registry) Update(user string, oldKey, newKey Key) error {
 		return ErrInvalidSlug
 	}
 
+	r.mu.Lock()
+	defer r.mu.Unlock()
+
 	if _, exists := r.slugIndex[newKey]; exists && newKey != oldKey {
 		return ErrSlugInUse
 	}
 
-	r.mu.Lock()
-	defer r.mu.Unlock()
-
 	client, ok := r.byUser[user][oldKey]
 	if !ok {
 		return ErrSessionNotFound

internal/server/server_test.go

@@ -33,6 +33,7 @@ type MockConfig struct {
 }
 
 func (m *MockConfig) Domain() string            { return m.Called().String(0) }
+func (m *MockConfig) FrontendURL() string       { return m.Called().String(0) }
 func (m *MockConfig) SSHPort() string           { return m.Called().String(0) }
 func (m *MockConfig) HTTPPort() string          { return m.Called().String(0) }
 func (m *MockConfig) HTTPSPort() string         { return m.Called().String(0) }

internal/session/forwarder/forwarder.go

@@ -28,6 +28,7 @@ type Forwarder interface {
 	Close() error
 }
 type forwarder struct {
+	mu            sync.RWMutex
 	listener      net.Listener
 	tunnelType    types.TunnelType
 	forwardedPort uint16
@@ -60,7 +61,7 @@ func (f *forwarder) copyWithBuffer(dst io.Writer, src io.Reader) (written int64,
 }
 
 func (f *forwarder) OpenForwardedChannel(ctx context.Context, origin net.Addr) (ssh.Channel, <-chan *ssh.Request, error) {
-	payload := createForwardedTCPIPPayload(origin, f.forwardedPort)
+	payload := createForwardedTCPIPPayload(origin, f.ForwardedPort())
 	type channelResult struct {
 		channel ssh.Channel
 		reqs    <-chan *ssh.Request
@@ -141,32 +142,44 @@ func (f *forwarder) HandleConnection(dst io.ReadWriter, src ssh.Channel) {
 }
 
 func (f *forwarder) SetType(tunnelType types.TunnelType) {
+	f.mu.Lock()
+	defer f.mu.Unlock()
 	f.tunnelType = tunnelType
 }
 
 func (f *forwarder) TunnelType() types.TunnelType {
+	f.mu.RLock()
+	defer f.mu.RUnlock()
 	return f.tunnelType
 }
 
 func (f *forwarder) ForwardedPort() uint16 {
+	f.mu.RLock()
+	defer f.mu.RUnlock()
 	return f.forwardedPort
 }
 
 func (f *forwarder) SetForwardedPort(port uint16) {
+	f.mu.Lock()
+	defer f.mu.Unlock()
 	f.forwardedPort = port
 }
 
 func (f *forwarder) SetListener(listener net.Listener) {
+	f.mu.Lock()
+	defer f.mu.Unlock()
 	f.listener = listener
 }
 
 func (f *forwarder) Listener() net.Listener {
+	f.mu.RLock()
+	defer f.mu.RUnlock()
 	return f.listener
 }
 
 func (f *forwarder) Close() error {
-	if f.Listener() != nil {
+	if listener := f.Listener(); listener != nil {
-		return f.listener.Close()
+		return listener.Close()
 	}
 	return nil
 }

internal/session/forwarder/forwarder_test.go

@@ -24,6 +24,7 @@ type mockConfig struct {
 }
 
 func (m *mockConfig) Domain() string            { return m.Called().String(0) }
+func (m *mockConfig) FrontendURL() string       { return m.Called().String(0) }
 func (m *mockConfig) SSHPort() string           { return m.Called().String(0) }
 func (m *mockConfig) HTTPPort() string          { return m.Called().String(0) }
 func (m *mockConfig) HTTPSPort() string         { return m.Called().String(0) }

internal/session/interaction/interaction_test.go

@@ -32,6 +32,7 @@ type MockConfig struct {
 }
 
 func (m *MockConfig) Domain() string            { return m.Called().String(0) }
+func (m *MockConfig) FrontendURL() string       { return m.Called().String(0) }
 func (m *MockConfig) SSHPort() string           { return m.Called().String(0) }
 func (m *MockConfig) HTTPPort() string          { return m.Called().String(0) }
 func (m *MockConfig) HTTPSPort() string         { return m.Called().String(0) }

internal/session/session.go

@@ -26,7 +26,7 @@ type Session interface {
 	HandleGlobalRequest(ch <-chan *ssh.Request) error
 	HandleTCPIPForward(req *ssh.Request) error
 	HandleHTTPForward(req *ssh.Request, port uint16) error
-	HandleTCPForward(req *ssh.Request, addr string, port uint16) error
+	HandleTCPForward(req *ssh.Request, addr string, port uint16, reserved bool) error
 	Lifecycle() lifecycle.Lifecycle
 	Interaction() interaction.Interaction
 	Forwarder() forwarder.Forwarder
@@ -158,7 +158,7 @@ func (s *session) setupInteractiveMode(channel ssh.NewChannel) error {
 	}
 
 	go func() {
-		err = s.HandleGlobalRequest(reqs)
+		err := s.HandleGlobalRequest(reqs)
 		if err != nil {
 			log.Printf("global request handler error: %v", err)
 		}
@@ -200,23 +200,22 @@ func (s *session) waitForSessionEnd() error {
 }
 
 func (s *session) waitForTCPIPForward() *ssh.Request {
-	select {
+	for {
-	case req, ok := <-s.initialReq:
+		select {
-		if !ok {
+		case req, ok := <-s.initialReq:
-			log.Println("Forwarding request channel closed")
+			if !ok {
+				log.Println("Forwarding request channel closed")
+				return nil
+			}
+			if req.Type == "tcpip-forward" {
+				return req
+			}
+			log.Printf("Ignoring unexpected global request: %s", req.Type)
+			_ = req.Reply(false, nil)
+		case <-time.After(500 * time.Millisecond):
+			log.Println("No tcpip-forward request received within timeout")
 			return nil
 		}
-		if req.Type == "tcpip-forward" {
-			return req
-		}
-		if err := req.Reply(false, nil); err != nil {
-			log.Printf("Failed to reply to request: %v", err)
-		}
-		log.Printf("Expected tcpip-forward request, got: %s", req.Type)
-		return nil
-	case <-time.After(500 * time.Millisecond):
-		log.Println("No forwarding request received")
-		return nil
 	}
 }
 
@@ -255,35 +254,35 @@ func (s *session) HandleGlobalRequest(GlobalRequest <-chan *ssh.Request) error {
 	return nil
 }
 
-func (s *session) parseForwardPayload(payload []byte) (address string, port uint16, err error) {
+func (s *session) parseForwardPayload(payload []byte) (address string, port uint16, reserved bool, err error) {
 	var forwardPayload struct {
 		BindAddr string
 		BindPort uint32
 	}
 
 	if err = ssh.Unmarshal(payload, &forwardPayload); err != nil {
-		return "", 0, fmt.Errorf("failed to unmarshal forward payload: %w", err)
+		return "", 0, false, fmt.Errorf("failed to unmarshal forward payload: %w", err)
 	}
 
 	if forwardPayload.BindPort > 65535 {
-		return "", 0, fmt.Errorf("port is larger than allowed port of 65535")
+		return "", 0, false, fmt.Errorf("port is larger than allowed port of 65535")
 	}
 
 	port = uint16(forwardPayload.BindPort)
 
 	if isBlockedPort(port) {
-		return "", 0, fmt.Errorf("port is blocked")
+		return "", 0, false, fmt.Errorf("port is blocked")
 	}
 
 	if port == 0 {
 		unassigned, ok := s.lifecycle.PortRegistry().Unassigned()
 		if !ok {
-			return "", 0, fmt.Errorf("no available port")
+			return "", 0, false, fmt.Errorf("no available port")
 		}
-		return forwardPayload.BindAddr, unassigned, nil
+		return forwardPayload.BindAddr, unassigned, true, nil
 	}
 
-	return forwardPayload.BindAddr, port, nil
+	return forwardPayload.BindAddr, port, false, nil
 }
 
 func (s *session) denyForwardingRequest(req *ssh.Request, key *types.SessionKey, listener io.Closer, msg string) error {
@@ -327,7 +326,7 @@ func (s *session) finalizeForwarding(req *ssh.Request, portToBind uint16, listen
 }
 
 func (s *session) HandleTCPIPForward(req *ssh.Request) error {
-	address, port, err := s.parseForwardPayload(req.Payload)
+	address, port, reserved, err := s.parseForwardPayload(req.Payload)
 	if err != nil {
 		return s.denyForwardingRequest(req, nil, nil, fmt.Sprintf("cannot parse forwarded payload: %s", err.Error()))
 	}
@@ -336,7 +335,7 @@ func (s *session) HandleTCPIPForward(req *ssh.Request) error {
 	case 80, 443:
 		return s.HandleHTTPForward(req, port)
 	default:
-		return s.HandleTCPForward(req, address, port)
+		return s.HandleTCPForward(req, address, port, reserved)
 	}
 }
 
@@ -357,30 +356,40 @@ func (s *session) HandleHTTPForward(req *ssh.Request, portToBind uint16) error {
 	return nil
 }
 
-func (s *session) HandleTCPForward(req *ssh.Request, addr string, portToBind uint16) error {
+func (s *session) HandleTCPForward(req *ssh.Request, addr string, portToBind uint16, reserved bool) error {
-	if claimed := s.lifecycle.PortRegistry().Claim(portToBind); !claimed {
+	if !reserved {
-		return s.denyForwardingRequest(req, nil, nil, fmt.Sprintf("Port %d is already in use or restricted", portToBind))
+		if claimed := s.lifecycle.PortRegistry().Claim(portToBind); !claimed {
+			return s.denyForwardingRequest(req, nil, nil, fmt.Sprintf("Port %d is already in use or restricted", portToBind))
+		}
+	}
+
+	releasePort := func() {
+		if err := s.lifecycle.PortRegistry().SetStatus(portToBind, false); err != nil {
+			log.Printf("failed to release port %d: %v", portToBind, err)
+		}
 	}
 
 	tcpServer := transport.NewTCPServer(portToBind, s.forwarder)
 	listener, err := tcpServer.Listen()
 	if err != nil {
+		releasePort()
 		return s.denyForwardingRequest(req, nil, listener, fmt.Sprintf("Port %d is already in use or restricted", portToBind))
 	}
 
 	key := types.SessionKey{Id: fmt.Sprintf("%d", portToBind), Type: types.TunnelTypeTCP}
 	if !s.registry.Register(key, s) {
+		releasePort()
 		return s.denyForwardingRequest(req, nil, listener, fmt.Sprintf("Failed to register TunnelTypeTCP client with id: %s", key.Id))
 	}
 
 	err = s.finalizeForwarding(req, portToBind, listener, types.TunnelTypeTCP, key.Id)
 	if err != nil {
+		releasePort()
 		return s.denyForwardingRequest(req, &key, listener, fmt.Sprintf("Failed to finalize forwarding: %s", err))
 	}
 
 	go func() {
-		err = tcpServer.Serve(listener)
+		if err := tcpServer.Serve(listener); err != nil {
-		if err != nil {
 			log.Printf("Failed serving tcp server: %s\n", err)
 		}
 	}()

internal/session/session_test.go

@@ -38,8 +38,9 @@ type mockConfig struct {
 	config.Config
 }
 
-func (m *mockConfig) Domain() string  { return m.Called().String(0) }
+func (m *mockConfig) Domain() string            { return m.Called().String(0) }
-func (m *mockConfig) SSHPort() string { return m.Called().String(0) }
+func (m *mockConfig) FrontendURL() string       { return m.Called().String(0) }
+func (m *mockConfig) SSHPort() string           { return m.Called().String(0) }
 func (m *mockConfig) Mode() types.ServerMode {
 	args := m.Called()
 	if args.Get(0) == nil {
@@ -396,6 +397,12 @@ func TestHandleTCPIPForward_Table(t *testing.T) {
 		err := s.HandleTCPIPForward(req)
 		assert.NoError(t, err)
 		assert.Equal(t, uint16(12345), s.forwarder.ForwardedPort())
+
+		defer func() {
+			if l := s.forwarder.Listener(); l != nil {
+				_ = l.Close()
+			}
+		}()
 	})
 
 	t.Run("Invalid Payload", func(t *testing.T) {
@@ -699,6 +706,7 @@ func TestForwardingFailures(t *testing.T) {
 		s, mRegistry, mPort, _, _, sReqs, cConn, cleanup := setup(t)
 		defer cleanup()
 		mPort.On("Claim", mock.Anything).Return(true)
+		mPort.On("SetStatus", uint16(1234), false).Return(nil)
 		mRegistry.On("Register", mock.Anything, mock.Anything).Return(false)
 
 		payload := make([]byte, 4+9+4)
@@ -717,7 +725,7 @@ func TestForwardingFailures(t *testing.T) {
 	})
 
 	t.Run("Finalize Forwarding Failure", func(t *testing.T) {
-		s, mRegistry, _, mRandom, _, sReqs, cConn, cleanup := setup(t)
+		s, mRegistry, _, mRandom, sConn, sReqs, cConn, cleanup := setup(t)
 		defer cleanup()
 		mRandom.On("String", 20).Return("test-slug", nil)
 		mRegistry.On("Register", mock.Anything, mock.Anything).Return(true)
@@ -736,7 +744,7 @@ func TestForwardingFailures(t *testing.T) {
 		err := cConn.Close()
 		assert.NoError(t, err)
 
-		time.Sleep(50 * time.Millisecond)
+		_ = sConn.Wait()
 
 		err = s.HandleTCPIPForward(req)
 		assert.Error(t, err)
@@ -758,6 +766,7 @@ func TestForwardingFailures(t *testing.T) {
 		}(l)
 		_, portStr, _ := net.SplitHostPort(l.Addr().String())
 		port, _ := strconv.Atoi(portStr)
+		mPort.On("SetStatus", uint16(port), false).Return(nil)
 
 		payload := make([]byte, 4+9+4)
 		binary.BigEndian.PutUint32(payload[0:4], 9)
@@ -807,7 +816,7 @@ func (m *mockNewChanFail) Accept() (ssh.Channel, <-chan *ssh.Request, error) {
 }
 
 func TestWaitForTCPIPForward_EdgeCases(t *testing.T) {
-	t.Run("Wrong Request Type", func(t *testing.T) {
+	t.Run("Wrong Request Type Then Timeout", func(t *testing.T) {
 		_, sReqs, _, cConn, cleanup := setupSSH(t)
 		defer cleanup()
 
@@ -817,10 +826,65 @@ func TestWaitForTCPIPForward_EdgeCases(t *testing.T) {
 			_, _, _ = cConn.SendRequest("not-tcpip-forward", true, nil)
 		}()
 
+		start := time.Now()
 		req := s.waitForTCPIPForward()
+		elapsed := time.Since(start)
+
 		if req != nil {
 			t.Error("expected nil request")
 		}
+		if elapsed < 400*time.Millisecond {
+			t.Errorf("expected timeout ~500ms, got %v", elapsed)
+		}
+	})
+
+	t.Run("Multiple Non-Forward Requests Then Success", func(t *testing.T) {
+		_, sReqs, _, cConn, cleanup := setupSSH(t)
+		defer cleanup()
+
+		s := &session{initialReq: sReqs}
+
+		go func() {
+			time.Sleep(100 * time.Millisecond)
+			_, _, _ = cConn.SendRequest("keepalive@openssh.com", false, nil)
+			time.Sleep(100 * time.Millisecond)
+			_, _, _ = cConn.SendRequest("hostkeys-00@openssh.com", false, nil)
+			time.Sleep(100 * time.Millisecond)
+			_, _, _ = cConn.SendRequest("tcpip-forward", true, nil)
+		}()
+
+		req := s.waitForTCPIPForward()
+		if req == nil {
+			t.Error("expected tcpip-forward request, got nil")
+		}
+		if req != nil && req.Type != "tcpip-forward" {
+			t.Errorf("expected tcpip-forward, got %s", req.Type)
+		}
+	})
+
+	t.Run("Timeout After Non-Forward Requests", func(t *testing.T) {
+		_, sReqs, _, cConn, cleanup := setupSSH(t)
+		defer cleanup()
+
+		s := &session{initialReq: sReqs}
+
+		go func() {
+			time.Sleep(100 * time.Millisecond)
+			_, _, _ = cConn.SendRequest("keepalive@openssh.com", false, nil)
+			time.Sleep(100 * time.Millisecond)
+			_, _, _ = cConn.SendRequest("hostkeys-00@openssh.com", false, nil)
+		}()
+
+		start := time.Now()
+		req := s.waitForTCPIPForward()
+		elapsed := time.Since(start)
+
+		if req != nil {
+			t.Error("expected nil request after timeout")
+		}
+		if elapsed < 400*time.Millisecond {
+			t.Errorf("expected timeout ~500ms after last request, got %v", elapsed)
+		}
 	})
 
 	t.Run("Channel Closed", func(t *testing.T) {
@@ -982,7 +1046,7 @@ func TestParseForwardPayload_Errors(t *testing.T) {
 	s := &session{}
 
 	t.Run("Short Address", func(t *testing.T) {
-		_, _, err := s.parseForwardPayload([]byte{0, 0, 0, 4})
+		_, _, _, err := s.parseForwardPayload([]byte{0, 0, 0, 4})
 		if err == nil {
 			t.Error("expected error, got nil")
 		}
@@ -990,7 +1054,7 @@ func TestParseForwardPayload_Errors(t *testing.T) {
 
 	t.Run("Short Port", func(t *testing.T) {
 		payload := append([]byte{0, 0, 0, 4}, []byte("addr")...)
-		_, _, err := s.parseForwardPayload(payload)
+		_, _, _, err := s.parseForwardPayload(payload)
 		if err == nil {
 			t.Error("expected error, got nil")
 		}
@@ -1001,7 +1065,7 @@ func TestParseForwardPayload_Errors(t *testing.T) {
 		portBuf := make([]byte, 4)
 		binary.BigEndian.PutUint32(portBuf, 22)
 		payload = append(payload, portBuf...)
-		_, _, err := s.parseForwardPayload(payload)
+		_, _, _, err := s.parseForwardPayload(payload)
 		if err == nil {
 			t.Error("expected error, got nil")
 		} else if !strings.Contains(err.Error(), "port is block") {
@@ -1165,7 +1229,7 @@ func TestHandleTCPForward_Failures(t *testing.T) {
 		s, _, mPort, _, sReqs, cConn, cleanup := setup(t)
 		defer cleanup()
 		mPort.On("Claim", mock.Anything).Return(false)
-		err := s.HandleTCPForward(getReq(t, cConn, sReqs), "localhost", 1234)
+		err := s.HandleTCPForward(getReq(t, cConn, sReqs), "localhost", 1234, false)
 		if err == nil {
 			t.Error("expected error, got nil")
 		} else if !strings.Contains(err.Error(), "already in use") {
@@ -1186,44 +1250,50 @@ func TestHandleTCPForward_Failures(t *testing.T) {
 			assert.NoError(t, err)
 		}(l)
 		port := uint16(l.Addr().(*net.TCPAddr).Port)
+		mPort.On("SetStatus", port, false).Return(nil)
 
-		err = s.HandleTCPForward(getReq(t, cConn, sReqs), "localhost", port)
+		err = s.HandleTCPForward(getReq(t, cConn, sReqs), "localhost", port, false)
 		if err == nil {
 			t.Error("expected error, got nil")
 		} else if !strings.Contains(err.Error(), "already in use") {
 			t.Errorf("expected error to contain %q, got %q", "already in use", err.Error())
 		}
+		mPort.AssertExpectations(t)
 	})
 
 	t.Run("Registry Register fail", func(t *testing.T) {
 		s, mRegistry, mPort, _, sReqs, cConn, cleanup := setup(t)
 		defer cleanup()
 		mPort.On("Claim", mock.Anything).Return(true)
+		mPort.On("SetStatus", mock.AnythingOfType("uint16"), false).Return(nil)
 		mRegistry.On("Register", mock.Anything, mock.Anything).Return(false)
-		err := s.HandleTCPForward(getReq(t, cConn, sReqs), "localhost", 0)
+		err := s.HandleTCPForward(getReq(t, cConn, sReqs), "localhost", 0, false)
 		if err == nil {
 			t.Error("expected error, got nil")
 		} else if !strings.Contains(err.Error(), "Failed to register") {
 			t.Errorf("expected error to contain %q, got %q", "Failed to register", err.Error())
 		}
+		mPort.AssertExpectations(t)
 	})
 
 	t.Run("Finalize fail (Reply fail)", func(t *testing.T) {
-		s, mRegistry, mPort, _, sReqs, cConn, cleanup := setup(t)
+		s, mRegistry, mPort, sConn, sReqs, cConn, cleanup := setup(t)
 		defer cleanup()
 		mPort.On("Claim", mock.Anything).Return(true)
+		mPort.On("SetStatus", mock.AnythingOfType("uint16"), false).Return(nil)
 		mRegistry.On("Register", mock.Anything, mock.Anything).Return(true)
 		req := getReq(t, cConn, sReqs)
 		err := cConn.Close()
 		assert.NoError(t, err)
-		time.Sleep(100 * time.Millisecond)
+		_ = sConn.Wait()
 
-		err = s.HandleTCPForward(req, "localhost", 0)
+		err = s.HandleTCPForward(req, "localhost", 0, false)
 		if err == nil {
 			t.Error("expected error, got nil")
 		} else if !strings.Contains(err.Error(), "Failed to finalize forwarding") {
 			t.Errorf("expected error to contain %q, got %q", "Failed to finalize forwarding", err.Error())
 		}
+		mPort.AssertExpectations(t)
 	})
 }
 

internal/session/slug/slug.go

@@ -1,11 +1,14 @@
 package slug
 
+import "sync"
+
 type Slug interface {
 	String() string
 	Set(slug string)
 }
 
 type slug struct {
+	mu   sync.RWMutex
 	slug string
 }
 
@@ -16,9 +19,13 @@ func New() Slug {
 }
 
 func (s *slug) String() string {
+	s.mu.RLock()
+	defer s.mu.RUnlock()
 	return s.slug
 }
 
 func (s *slug) Set(slug string) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
 	s.slug = slug
 }

internal/transport/httphandler.go

@@ -1,6 +1,7 @@
 package transport
 
 import (
+	"bufio"
 	"bytes"
 	"context"
 	"errors"
@@ -52,25 +53,43 @@ func (hh *httpHandler) badRequest(conn net.Conn) error {
 	return nil
 }
 
+func readHTTPHeader(br *bufio.Reader, limit int) ([]byte, error) {
+	var headerBuf []byte
+	for {
+		line, err := br.ReadSlice('\n')
+		headerBuf = append(headerBuf, line...)
+		if errors.Is(err, bufio.ErrBufferFull) {
+			if len(headerBuf) > limit {
+				return nil, fmt.Errorf("headers too large")
+			}
+			continue
+		}
+		if err != nil {
+			return nil, err
+		}
+		if bytes.HasSuffix(headerBuf, []byte("\r\n\r\n")) {
+			return headerBuf, nil
+		}
+		if len(headerBuf) > limit {
+			return nil, fmt.Errorf("headers too large")
+		}
+	}
+}
+
 func (hh *httpHandler) Handler(conn net.Conn, isTLS bool) {
 	defer hh.closeConnection(conn)
 
 	_ = conn.SetReadDeadline(time.Now().Add(10 * time.Second))
-	buf := make([]byte, hh.config.HeaderSize())
+	br := bufio.NewReaderSize(conn, hh.config.HeaderSize())
-	n, err := conn.Read(buf)
+	headerBuf, err := readHTTPHeader(br, hh.config.HeaderSize())
 	if err != nil {
 		_ = hh.badRequest(conn)
 		return
 	}
 
-	if idx := bytes.Index(buf[:n], []byte("\r\n\r\n")); idx == -1 {
-		_ = hh.badRequest(conn)
-		return
-	}
-
 	_ = conn.SetReadDeadline(time.Time{})
 
-	reqhf, err := header.NewRequest(buf[:n])
+	reqhf, err := header.NewRequest(headerBuf)
 	if err != nil {
 		log.Printf("Error creating request header: %v", err)
 		_ = hh.badRequest(conn)
@@ -97,11 +116,11 @@ func (hh *httpHandler) Handler(conn net.Conn, isTLS bool) {
 		Type: types.TunnelTypeHTTP,
 	})
 	if err != nil {
-		_ = hh.redirect(conn, http.StatusMovedPermanently, fmt.Sprintf("https://tunnl.live/tunnel-not-found?slug=%s\r\n", slug))
+		_ = hh.redirect(conn, http.StatusMovedPermanently, fmt.Sprintf("%s/tunnel-not-found?slug=%s\r\n", hh.config.FrontendURL(), slug))
 		return
 	}
 
-	hw := stream.New(conn, conn, conn.RemoteAddr())
+	hw := stream.New(conn, br, conn.RemoteAddr())
 	defer func(hw stream.HTTP) {
 		err = hw.Close()
 		if err != nil {

internal/transport/httphandler_test.go

@@ -223,6 +223,7 @@ func TestNewHTTPHandler(t *testing.T) {
 	msr := new(MockSessionRegistry)
 	mockConfig := &MockConfig{}
 	mockConfig.On("Domain").Return("domain")
+	mockConfig.On("FrontendURL").Return("https://domain")
 	mockConfig.On("TLSRedirect").Return(false)
 	hh := newHTTPHandler(mockConfig, msr)
 	assert.NotNil(t, hh)
@@ -290,7 +291,7 @@ func TestHandler(t *testing.T) {
 			isTLS:       true,
 			redirectTLS: false,
 			request:     []byte("GET / HTTP/1.1\r\nHost: test.domain\r\n\r\n"),
-			expected:    []byte("HTTP/1.1 301 Moved Permanently\r\nLocation: https://tunnl.live/tunnel-not-found?slug=test\r\nContent-Length: 0\r\nConnection: close\r\n\r\n"),
+			expected:    []byte("HTTP/1.1 301 Moved Permanently\r\nLocation: https://example.com/tunnel-not-found?slug=test\r\nContent-Length: 0\r\nConnection: close\r\n\r\n"),
 			setupMocks: func(msr *MockSessionRegistry) {
 				msr.On("Get", types.SessionKey{
 					Id:   "test",
@@ -321,8 +322,14 @@ func TestHandler(t *testing.T) {
 			isTLS:       false,
 			redirectTLS: false,
 			request:     []byte(""),
-			expected:    []byte("HTTP/1.1 400 Bad Request\r\n\r\n"),
+			expected:    []byte(""),
-			setupMocks: func(msr *MockSessionRegistry) {
+			setupConn: func() (net.Conn, net.Conn) {
+				mc := new(MockConn)
+				mc.ReadBuffer = bytes.NewBuffer(nil)
+				mc.On("SetReadDeadline", mock.Anything).Return(nil)
+				mc.On("Write", []byte("HTTP/1.1 400 Bad Request\r\n\r\n")).Return(0, nil)
+				mc.On("Close").Return(nil)
+				return mc, nil
 			},
 		},
 		{
@@ -610,6 +617,7 @@ func TestHandler(t *testing.T) {
 			mockConfig := &MockConfig{}
 			port := "0"
 			mockConfig.On("Domain").Return("example.com")
+			mockConfig.On("FrontendURL").Return("https://example.com")
 			mockConfig.On("HTTPPort").Return(port)
 			mockConfig.On("HeaderSize").Return(4096)
 			mockConfig.On("TLSRedirect").Return(true)
@@ -715,3 +723,114 @@ func TestHandler(t *testing.T) {
 		})
 	}
 }
+
+func TestHandlerForwardsPostBody(t *testing.T) {
+	mockSessionRegistry := new(MockSessionRegistry)
+	mockConfig := &MockConfig{}
+	mockConfig.On("Domain").Return("example.com")
+	mockConfig.On("FrontendURL").Return("https://example.com")
+	mockConfig.On("HTTPPort").Return("0")
+	mockConfig.On("HeaderSize").Return(4096)
+	mockConfig.On("TLSRedirect").Return(true)
+	hh := &httpHandler{
+		sessionRegistry: mockSessionRegistry,
+		config:          mockConfig,
+	}
+
+	mockSession := new(MockSession)
+	mockForwarder := new(MockForwarder)
+	mockSSHChannel := new(MockSSHChannel)
+
+	mockSessionRegistry.On("Get", types.SessionKey{
+		Id:   "test",
+		Type: types.TunnelTypeHTTP,
+	}).Return(mockSession, nil)
+	mockSession.On("Forwarder").Return(mockForwarder)
+
+	reqCh := make(chan *ssh.Request)
+	mockForwarder.On("OpenForwardedChannel", mock.Anything, mock.Anything).Return(mockSSHChannel, (<-chan *ssh.Request)(reqCh), nil)
+
+	var mu sync.Mutex
+	var capturedHeaders []byte
+	mockSSHChannel.On("Write", mock.Anything).Run(func(args mock.Arguments) {
+		mu.Lock()
+		capturedHeaders = append(capturedHeaders, args.Get(0).([]byte)...)
+		mu.Unlock()
+	}).Return(0, nil)
+	mockSSHChannel.On("Close").Return(nil)
+
+	bodyChan := make(chan string, 1)
+	mockForwarder.On("HandleConnection", mock.Anything, mockSSHChannel).Run(func(args mock.Arguments) {
+		w := args.Get(0).(io.ReadWriter)
+		buf := make([]byte, len("hello=world"))
+		if _, err := io.ReadFull(w, buf); err != nil {
+			bodyChan <- ""
+		} else {
+			bodyChan <- string(buf)
+		}
+		_, _ = w.Write([]byte("HTTP/1.1 200 OK\r\nContent-Length: 2\r\n\r\nok"))
+	})
+
+	go func() {
+		for range reqCh {
+		}
+	}()
+
+	serverConn, clientConn := net.Pipe()
+	defer func() {
+		_ = clientConn.Close()
+	}()
+
+	remoteAddr, _ := net.ResolveTCPAddr("tcp", "127.0.0.1:12345")
+	wrappedServerConn := &wrappedConn{Conn: serverConn, remoteAddr: remoteAddr}
+
+	go hh.Handler(wrappedServerConn, true)
+
+	request := []byte("POST / HTTP/1.1\r\nHost: test.domain\r\nContent-Type: application/x-www-form-urlencoded\r\nContent-Length: 11\r\n\r\nhello=world")
+	go func() {
+		_, _ = clientConn.Write(request)
+	}()
+
+	var response []byte
+	respDone := make(chan struct{})
+	go func() {
+		defer close(respDone)
+		buf := make([]byte, 4096)
+		for {
+			n, err := clientConn.Read(buf)
+			if err != nil {
+				break
+			}
+			response = append(response, buf[:n]...)
+			if bytes.Contains(response, []byte("\r\n\r\nok")) {
+				break
+			}
+		}
+	}()
+
+	select {
+	case body := <-bodyChan:
+		assert.Equal(t, "hello=world", body)
+	case <-time.After(5 * time.Second):
+		t.Fatal("timed out waiting for forwarded body")
+	}
+
+	select {
+	case <-respDone:
+		resStr := string(response)
+		assert.True(t, strings.HasPrefix(resStr, "HTTP/1.1 200 OK\r\n"))
+		assert.Contains(t, resStr, "Server: Tunnel Please\r\n")
+		assert.True(t, strings.HasSuffix(resStr, "\r\n\r\nok"))
+	case <-time.After(5 * time.Second):
+		t.Fatal("timed out waiting for response")
+	}
+
+	mu.Lock()
+	hdrStr := string(capturedHeaders)
+	mu.Unlock()
+	assert.Contains(t, hdrStr, "POST / HTTP/1.1\r\n")
+	assert.Contains(t, hdrStr, "Content-Length: 11\r\n")
+	assert.Contains(t, hdrStr, "X-Forwarded-For: 127.0.0.1\r\n")
+
+	mockSessionRegistry.AssertExpectations(t)
+}

internal/transport/tls_test.go

@@ -25,6 +25,7 @@ type MockConfig struct {
 }
 
 func (m *MockConfig) Domain() string            { return m.Called().String(0) }
+func (m *MockConfig) FrontendURL() string       { return m.Called().String(0) }
 func (m *MockConfig) SSHPort() string           { return m.Called().String(0) }
 func (m *MockConfig) HTTPPort() string          { return m.Called().String(0) }
 func (m *MockConfig) HTTPSPort() string         { return m.Called().String(0) }