715 lines
20 KiB
Go
715 lines
20 KiB
Go
package server
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import (
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"context"
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"errors"
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"expvar"
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"fmt"
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stdlog "log"
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"net"
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"net/http"
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"net/url"
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"os"
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"strings"
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"sync"
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"syscall"
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"time"
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"github.com/containous/alice"
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"github.com/pires/go-proxyproto"
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"github.com/sirupsen/logrus"
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"github.com/traefik/traefik/v2/pkg/config/static"
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"github.com/traefik/traefik/v2/pkg/ip"
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"github.com/traefik/traefik/v2/pkg/log"
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"github.com/traefik/traefik/v2/pkg/middlewares"
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"github.com/traefik/traefik/v2/pkg/middlewares/forwardedheaders"
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"github.com/traefik/traefik/v2/pkg/middlewares/requestdecorator"
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"github.com/traefik/traefik/v2/pkg/safe"
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"github.com/traefik/traefik/v2/pkg/server/router"
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tcprouter "github.com/traefik/traefik/v2/pkg/server/router/tcp"
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"github.com/traefik/traefik/v2/pkg/server/service"
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"github.com/traefik/traefik/v2/pkg/tcp"
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"github.com/traefik/traefik/v2/pkg/types"
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"golang.org/x/net/http2"
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"golang.org/x/net/http2/h2c"
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)
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var httpServerLogger = stdlog.New(log.WithoutContext().WriterLevel(logrus.DebugLevel), "", 0)
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type key string
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const (
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connStateKey key = "connState"
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debugConnectionEnv string = "DEBUG_CONNECTION"
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)
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var (
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clientConnectionStates = map[string]*connState{}
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clientConnectionStatesMu = sync.RWMutex{}
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)
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type connState struct {
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State string
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KeepAliveState string
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Start time.Time
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HTTPRequestCount int
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}
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type httpForwarder struct {
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net.Listener
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connChan chan net.Conn
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errChan chan error
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}
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func newHTTPForwarder(ln net.Listener) *httpForwarder {
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return &httpForwarder{
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Listener: ln,
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connChan: make(chan net.Conn),
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errChan: make(chan error),
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}
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}
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// ServeTCP uses the connection to serve it later in "Accept".
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func (h *httpForwarder) ServeTCP(conn tcp.WriteCloser) {
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h.connChan <- conn
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}
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// Accept retrieves a served connection in ServeTCP.
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func (h *httpForwarder) Accept() (net.Conn, error) {
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select {
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case conn := <-h.connChan:
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return conn, nil
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case err := <-h.errChan:
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return nil, err
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}
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}
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// TCPEntryPoints holds a map of TCPEntryPoint (the entrypoint names being the keys).
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type TCPEntryPoints map[string]*TCPEntryPoint
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// NewTCPEntryPoints creates a new TCPEntryPoints.
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func NewTCPEntryPoints(entryPointsConfig static.EntryPoints, hostResolverConfig *types.HostResolverConfig) (TCPEntryPoints, error) {
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if os.Getenv(debugConnectionEnv) != "" {
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expvar.Publish("clientConnectionStates", expvar.Func(func() any {
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return clientConnectionStates
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}))
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}
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serverEntryPointsTCP := make(TCPEntryPoints)
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for entryPointName, config := range entryPointsConfig {
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protocol, err := config.GetProtocol()
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if err != nil {
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return nil, fmt.Errorf("error while building entryPoint %s: %w", entryPointName, err)
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}
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if protocol != "tcp" {
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continue
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}
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ctx := log.With(context.Background(), log.Str(log.EntryPointName, entryPointName))
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serverEntryPointsTCP[entryPointName], err = NewTCPEntryPoint(ctx, config, hostResolverConfig)
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if err != nil {
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return nil, fmt.Errorf("error while building entryPoint %s: %w", entryPointName, err)
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}
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}
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return serverEntryPointsTCP, nil
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}
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// Start the server entry points.
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func (eps TCPEntryPoints) Start() {
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for entryPointName, serverEntryPoint := range eps {
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ctx := log.With(context.Background(), log.Str(log.EntryPointName, entryPointName))
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go serverEntryPoint.Start(ctx)
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}
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}
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// Stop the server entry points.
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func (eps TCPEntryPoints) Stop() {
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var wg sync.WaitGroup
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for epn, ep := range eps {
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wg.Add(1)
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go func(entryPointName string, entryPoint *TCPEntryPoint) {
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defer wg.Done()
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ctx := log.With(context.Background(), log.Str(log.EntryPointName, entryPointName))
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entryPoint.Shutdown(ctx)
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log.FromContext(ctx).Debugf("Entry point %s closed", entryPointName)
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}(epn, ep)
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}
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wg.Wait()
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}
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// Switch the TCP routers.
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func (eps TCPEntryPoints) Switch(routersTCP map[string]*tcprouter.Router) {
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for entryPointName, rt := range routersTCP {
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eps[entryPointName].SwitchRouter(rt)
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}
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}
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// TCPEntryPoint is the TCP server.
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type TCPEntryPoint struct {
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listener net.Listener
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switcher *tcp.HandlerSwitcher
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transportConfiguration *static.EntryPointsTransport
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tracker *connectionTracker
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httpServer *httpServer
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httpsServer *httpServer
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http3Server *http3server
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}
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// NewTCPEntryPoint creates a new TCPEntryPoint.
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func NewTCPEntryPoint(ctx context.Context, configuration *static.EntryPoint, hostResolverConfig *types.HostResolverConfig) (*TCPEntryPoint, error) {
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tracker := newConnectionTracker()
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listener, err := buildListener(ctx, configuration)
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if err != nil {
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return nil, fmt.Errorf("error preparing server: %w", err)
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}
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rt, err := tcprouter.NewRouter()
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if err != nil {
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return nil, fmt.Errorf("error preparing tcp router: %w", err)
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}
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reqDecorator := requestdecorator.New(hostResolverConfig)
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httpServer, err := createHTTPServer(ctx, listener, configuration, true, reqDecorator)
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if err != nil {
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return nil, fmt.Errorf("error preparing http server: %w", err)
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}
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rt.SetHTTPForwarder(httpServer.Forwarder)
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httpsServer, err := createHTTPServer(ctx, listener, configuration, false, reqDecorator)
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if err != nil {
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return nil, fmt.Errorf("error preparing https server: %w", err)
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}
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h3Server, err := newHTTP3Server(ctx, configuration, httpsServer)
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if err != nil {
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return nil, fmt.Errorf("error preparing http3 server: %w", err)
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}
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rt.SetHTTPSForwarder(httpsServer.Forwarder)
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tcpSwitcher := &tcp.HandlerSwitcher{}
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tcpSwitcher.Switch(rt)
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return &TCPEntryPoint{
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listener: listener,
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switcher: tcpSwitcher,
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transportConfiguration: configuration.Transport,
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tracker: tracker,
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httpServer: httpServer,
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httpsServer: httpsServer,
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http3Server: h3Server,
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}, nil
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}
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// Start starts the TCP server.
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func (e *TCPEntryPoint) Start(ctx context.Context) {
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logger := log.FromContext(ctx)
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logger.Debug("Starting TCP Server")
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if e.http3Server != nil {
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go func() { _ = e.http3Server.Start() }()
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}
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for {
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conn, err := e.listener.Accept()
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if err != nil {
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logger.Error(err)
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var opErr *net.OpError
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if errors.As(err, &opErr) && opErr.Temporary() {
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continue
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}
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var urlErr *url.Error
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if errors.As(err, &urlErr) && urlErr.Temporary() {
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continue
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}
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e.httpServer.Forwarder.errChan <- err
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e.httpsServer.Forwarder.errChan <- err
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return
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}
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writeCloser, err := writeCloser(conn)
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if err != nil {
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panic(err)
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}
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safe.Go(func() {
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// Enforce read/write deadlines at the connection level,
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// because when we're peeking the first byte to determine whether we are doing TLS,
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// the deadlines at the server level are not taken into account.
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if e.transportConfiguration.RespondingTimeouts.ReadTimeout > 0 {
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err := writeCloser.SetReadDeadline(time.Now().Add(time.Duration(e.transportConfiguration.RespondingTimeouts.ReadTimeout)))
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if err != nil {
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logger.Errorf("Error while setting read deadline: %v", err)
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}
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}
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if e.transportConfiguration.RespondingTimeouts.WriteTimeout > 0 {
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err = writeCloser.SetWriteDeadline(time.Now().Add(time.Duration(e.transportConfiguration.RespondingTimeouts.WriteTimeout)))
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if err != nil {
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logger.Errorf("Error while setting write deadline: %v", err)
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}
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}
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e.switcher.ServeTCP(newTrackedConnection(writeCloser, e.tracker))
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})
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}
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}
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// Shutdown stops the TCP connections.
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func (e *TCPEntryPoint) Shutdown(ctx context.Context) {
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logger := log.FromContext(ctx)
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reqAcceptGraceTimeOut := time.Duration(e.transportConfiguration.LifeCycle.RequestAcceptGraceTimeout)
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if reqAcceptGraceTimeOut > 0 {
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logger.Infof("Waiting %s for incoming requests to cease", reqAcceptGraceTimeOut)
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time.Sleep(reqAcceptGraceTimeOut)
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}
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graceTimeOut := time.Duration(e.transportConfiguration.LifeCycle.GraceTimeOut)
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ctx, cancel := context.WithTimeout(ctx, graceTimeOut)
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logger.Debugf("Waiting %s seconds before killing connections.", graceTimeOut)
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var wg sync.WaitGroup
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shutdownServer := func(server stoppable) {
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defer wg.Done()
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err := server.Shutdown(ctx)
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if err == nil {
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return
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}
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if errors.Is(ctx.Err(), context.DeadlineExceeded) {
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logger.Debugf("Server failed to shutdown within deadline because: %s", err)
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if err = server.Close(); err != nil {
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logger.Error(err)
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}
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return
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}
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logger.Error(err)
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// We expect Close to fail again because Shutdown most likely failed when trying to close a listener.
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// We still call it however, to make sure that all connections get closed as well.
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server.Close()
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}
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if e.httpServer.Server != nil {
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wg.Add(1)
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go shutdownServer(e.httpServer.Server)
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}
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if e.httpsServer.Server != nil {
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wg.Add(1)
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go shutdownServer(e.httpsServer.Server)
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if e.http3Server != nil {
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wg.Add(1)
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go shutdownServer(e.http3Server)
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}
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}
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if e.tracker != nil {
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wg.Add(1)
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go func() {
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defer wg.Done()
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err := e.tracker.Shutdown(ctx)
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if err == nil {
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return
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}
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if errors.Is(ctx.Err(), context.DeadlineExceeded) {
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logger.Debugf("Server failed to shutdown before deadline because: %s", err)
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}
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e.tracker.Close()
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}()
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}
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wg.Wait()
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cancel()
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}
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// SwitchRouter switches the TCP router handler.
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func (e *TCPEntryPoint) SwitchRouter(rt *tcprouter.Router) {
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rt.SetHTTPForwarder(e.httpServer.Forwarder)
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httpHandler := rt.GetHTTPHandler()
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if httpHandler == nil {
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httpHandler = router.BuildDefaultHTTPRouter()
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}
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e.httpServer.Switcher.UpdateHandler(httpHandler)
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rt.SetHTTPSForwarder(e.httpsServer.Forwarder)
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httpsHandler := rt.GetHTTPSHandler()
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if httpsHandler == nil {
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httpsHandler = router.BuildDefaultHTTPRouter()
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}
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e.httpsServer.Switcher.UpdateHandler(httpsHandler)
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e.switcher.Switch(rt)
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if e.http3Server != nil {
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e.http3Server.Switch(rt)
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}
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}
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// writeCloserWrapper wraps together a connection, and the concrete underlying
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// connection type that was found to satisfy WriteCloser.
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type writeCloserWrapper struct {
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net.Conn
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writeCloser tcp.WriteCloser
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}
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func (c *writeCloserWrapper) CloseWrite() error {
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return c.writeCloser.CloseWrite()
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}
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// writeCloser returns the given connection, augmented with the WriteCloser
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// implementation, if any was found within the underlying conn.
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func writeCloser(conn net.Conn) (tcp.WriteCloser, error) {
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switch typedConn := conn.(type) {
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case *proxyproto.Conn:
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underlying, ok := typedConn.TCPConn()
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if !ok {
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return nil, errors.New("underlying connection is not a tcp connection")
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}
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return &writeCloserWrapper{writeCloser: underlying, Conn: typedConn}, nil
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case *net.TCPConn:
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return typedConn, nil
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default:
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return nil, fmt.Errorf("unknown connection type %T", typedConn)
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}
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}
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// tcpKeepAliveListener sets TCP keep-alive timeouts on accepted
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// connections.
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type tcpKeepAliveListener struct {
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*net.TCPListener
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}
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func (ln tcpKeepAliveListener) Accept() (net.Conn, error) {
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tc, err := ln.AcceptTCP()
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if err != nil {
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return nil, err
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}
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if err := tc.SetKeepAlive(true); err != nil {
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return nil, err
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}
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if err := tc.SetKeepAlivePeriod(3 * time.Minute); err != nil {
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// Some systems, such as OpenBSD, have no user-settable per-socket TCP
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// keepalive options.
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if !errors.Is(err, syscall.ENOPROTOOPT) {
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return nil, err
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}
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}
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return tc, nil
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}
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func buildProxyProtocolListener(ctx context.Context, entryPoint *static.EntryPoint, listener net.Listener) (net.Listener, error) {
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timeout := entryPoint.Transport.RespondingTimeouts.ReadTimeout
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// proxyproto use 200ms if ReadHeaderTimeout is set to 0 and not no timeout
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if timeout == 0 {
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timeout = -1
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}
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proxyListener := &proxyproto.Listener{Listener: listener, ReadHeaderTimeout: time.Duration(timeout)}
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if entryPoint.ProxyProtocol.Insecure {
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log.FromContext(ctx).Infof("Enabling ProxyProtocol without trusted IPs: Insecure")
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return proxyListener, nil
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}
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checker, err := ip.NewChecker(entryPoint.ProxyProtocol.TrustedIPs)
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if err != nil {
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return nil, err
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}
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proxyListener.Policy = func(upstream net.Addr) (proxyproto.Policy, error) {
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ipAddr, ok := upstream.(*net.TCPAddr)
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if !ok {
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return proxyproto.REJECT, fmt.Errorf("type error %v", upstream)
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}
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if !checker.ContainsIP(ipAddr.IP) {
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log.FromContext(ctx).Debugf("IP %s is not in trusted IPs list, ignoring ProxyProtocol Headers and bypass connection", ipAddr.IP)
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return proxyproto.IGNORE, nil
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}
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return proxyproto.USE, nil
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}
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log.FromContext(ctx).Infof("Enabling ProxyProtocol for trusted IPs %v", entryPoint.ProxyProtocol.TrustedIPs)
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return proxyListener, nil
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}
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func buildListener(ctx context.Context, entryPoint *static.EntryPoint) (net.Listener, error) {
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listener, err := net.Listen("tcp", entryPoint.GetAddress())
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if err != nil {
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return nil, fmt.Errorf("error opening listener: %w", err)
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}
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listener = tcpKeepAliveListener{listener.(*net.TCPListener)}
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if entryPoint.ProxyProtocol != nil {
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listener, err = buildProxyProtocolListener(ctx, entryPoint, listener)
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if err != nil {
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return nil, fmt.Errorf("error creating proxy protocol listener: %w", err)
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}
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}
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return listener, nil
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}
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func newConnectionTracker() *connectionTracker {
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return &connectionTracker{
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conns: make(map[net.Conn]struct{}),
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}
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}
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type connectionTracker struct {
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conns map[net.Conn]struct{}
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lock sync.RWMutex
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}
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// AddConnection add a connection in the tracked connections list.
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func (c *connectionTracker) AddConnection(conn net.Conn) {
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c.lock.Lock()
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defer c.lock.Unlock()
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c.conns[conn] = struct{}{}
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}
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// RemoveConnection remove a connection from the tracked connections list.
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func (c *connectionTracker) RemoveConnection(conn net.Conn) {
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c.lock.Lock()
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defer c.lock.Unlock()
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delete(c.conns, conn)
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}
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func (c *connectionTracker) isEmpty() bool {
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c.lock.RLock()
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defer c.lock.RUnlock()
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return len(c.conns) == 0
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}
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// Shutdown wait for the connection closing.
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func (c *connectionTracker) Shutdown(ctx context.Context) error {
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ticker := time.NewTicker(500 * time.Millisecond)
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defer ticker.Stop()
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for {
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if c.isEmpty() {
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return nil
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}
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select {
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case <-ctx.Done():
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return ctx.Err()
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case <-ticker.C:
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}
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}
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}
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// Close close all the connections in the tracked connections list.
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func (c *connectionTracker) Close() {
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c.lock.Lock()
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defer c.lock.Unlock()
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for conn := range c.conns {
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if err := conn.Close(); err != nil {
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log.WithoutContext().Errorf("Error while closing connection: %v", err)
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}
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delete(c.conns, conn)
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}
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}
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type stoppable interface {
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Shutdown(ctx context.Context) error
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Close() error
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}
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type stoppableServer interface {
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stoppable
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Serve(listener net.Listener) error
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}
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type httpServer struct {
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|
Server stoppableServer
|
|
Forwarder *httpForwarder
|
|
Switcher *middlewares.HTTPHandlerSwitcher
|
|
}
|
|
|
|
func createHTTPServer(ctx context.Context, ln net.Listener, configuration *static.EntryPoint, withH2c bool, reqDecorator *requestdecorator.RequestDecorator) (*httpServer, error) {
|
|
if configuration.HTTP2.MaxConcurrentStreams < 0 {
|
|
return nil, errors.New("max concurrent streams value must be greater than or equal to zero")
|
|
}
|
|
|
|
httpSwitcher := middlewares.NewHandlerSwitcher(router.BuildDefaultHTTPRouter())
|
|
|
|
next, err := alice.New(requestdecorator.WrapHandler(reqDecorator)).Then(httpSwitcher)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
var handler http.Handler
|
|
handler, err = forwardedheaders.NewXForwarded(
|
|
configuration.ForwardedHeaders.Insecure,
|
|
configuration.ForwardedHeaders.TrustedIPs,
|
|
configuration.ForwardedHeaders.Connection,
|
|
next)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
handler = denyFragment(handler)
|
|
if configuration.HTTP.EncodeQuerySemicolons {
|
|
handler = encodeQuerySemicolons(handler)
|
|
} else {
|
|
handler = http.AllowQuerySemicolons(handler)
|
|
}
|
|
|
|
debugConnection := os.Getenv(debugConnectionEnv) != ""
|
|
if debugConnection || (configuration.Transport != nil && (configuration.Transport.KeepAliveMaxTime > 0 || configuration.Transport.KeepAliveMaxRequests > 0)) {
|
|
handler = newKeepAliveMiddleware(handler, configuration.Transport.KeepAliveMaxRequests, configuration.Transport.KeepAliveMaxTime)
|
|
}
|
|
|
|
if withH2c {
|
|
handler = h2c.NewHandler(handler, &http2.Server{
|
|
MaxConcurrentStreams: uint32(configuration.HTTP2.MaxConcurrentStreams),
|
|
})
|
|
}
|
|
|
|
serverHTTP := &http.Server{
|
|
Handler: handler,
|
|
ErrorLog: httpServerLogger,
|
|
ReadTimeout: time.Duration(configuration.Transport.RespondingTimeouts.ReadTimeout),
|
|
WriteTimeout: time.Duration(configuration.Transport.RespondingTimeouts.WriteTimeout),
|
|
IdleTimeout: time.Duration(configuration.Transport.RespondingTimeouts.IdleTimeout),
|
|
}
|
|
if debugConnection || (configuration.Transport != nil && (configuration.Transport.KeepAliveMaxTime > 0 || configuration.Transport.KeepAliveMaxRequests > 0)) {
|
|
serverHTTP.ConnContext = func(ctx context.Context, c net.Conn) context.Context {
|
|
cState := &connState{Start: time.Now()}
|
|
if debugConnection {
|
|
clientConnectionStatesMu.Lock()
|
|
clientConnectionStates[getConnKey(c)] = cState
|
|
clientConnectionStatesMu.Unlock()
|
|
}
|
|
return context.WithValue(ctx, connStateKey, cState)
|
|
}
|
|
|
|
if debugConnection {
|
|
serverHTTP.ConnState = func(c net.Conn, state http.ConnState) {
|
|
clientConnectionStatesMu.Lock()
|
|
if clientConnectionStates[getConnKey(c)] != nil {
|
|
clientConnectionStates[getConnKey(c)].State = state.String()
|
|
}
|
|
clientConnectionStatesMu.Unlock()
|
|
}
|
|
}
|
|
}
|
|
|
|
prevConnContext := serverHTTP.ConnContext
|
|
serverHTTP.ConnContext = func(ctx context.Context, c net.Conn) context.Context {
|
|
// This adds an empty struct in order to store a RoundTripper in the ConnContext in case of Kerberos or NTLM.
|
|
ctx = service.AddTransportOnContext(ctx)
|
|
if prevConnContext != nil {
|
|
return prevConnContext(ctx, c)
|
|
}
|
|
return ctx
|
|
}
|
|
|
|
// ConfigureServer configures HTTP/2 with the MaxConcurrentStreams option for the given server.
|
|
// Also keeping behavior the same as
|
|
// https://cs.opensource.google/go/go/+/refs/tags/go1.17.7:src/net/http/server.go;l=3262
|
|
if !strings.Contains(os.Getenv("GODEBUG"), "http2server=0") {
|
|
err = http2.ConfigureServer(serverHTTP, &http2.Server{
|
|
MaxConcurrentStreams: uint32(configuration.HTTP2.MaxConcurrentStreams),
|
|
NewWriteScheduler: func() http2.WriteScheduler { return http2.NewPriorityWriteScheduler(nil) },
|
|
})
|
|
if err != nil {
|
|
return nil, fmt.Errorf("configure HTTP/2 server: %w", err)
|
|
}
|
|
}
|
|
|
|
listener := newHTTPForwarder(ln)
|
|
go func() {
|
|
err := serverHTTP.Serve(listener)
|
|
if err != nil && !errors.Is(err, http.ErrServerClosed) {
|
|
log.FromContext(ctx).Errorf("Error while starting server: %v", err)
|
|
}
|
|
}()
|
|
return &httpServer{
|
|
Server: serverHTTP,
|
|
Forwarder: listener,
|
|
Switcher: httpSwitcher,
|
|
}, nil
|
|
}
|
|
|
|
func getConnKey(conn net.Conn) string {
|
|
return fmt.Sprintf("%s => %s", conn.RemoteAddr(), conn.LocalAddr())
|
|
}
|
|
|
|
func newTrackedConnection(conn tcp.WriteCloser, tracker *connectionTracker) *trackedConnection {
|
|
tracker.AddConnection(conn)
|
|
return &trackedConnection{
|
|
WriteCloser: conn,
|
|
tracker: tracker,
|
|
}
|
|
}
|
|
|
|
type trackedConnection struct {
|
|
tracker *connectionTracker
|
|
tcp.WriteCloser
|
|
}
|
|
|
|
func (t *trackedConnection) Close() error {
|
|
t.tracker.RemoveConnection(t.WriteCloser)
|
|
return t.WriteCloser.Close()
|
|
}
|
|
|
|
// This function is inspired by http.AllowQuerySemicolons.
|
|
func encodeQuerySemicolons(h http.Handler) http.Handler {
|
|
return http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
|
|
if strings.Contains(req.URL.RawQuery, ";") {
|
|
r2 := new(http.Request)
|
|
*r2 = *req
|
|
r2.URL = new(url.URL)
|
|
*r2.URL = *req.URL
|
|
|
|
r2.URL.RawQuery = strings.ReplaceAll(req.URL.RawQuery, ";", "%3B")
|
|
// Because the reverse proxy director is building query params from requestURI it needs to be updated as well.
|
|
r2.RequestURI = r2.URL.RequestURI()
|
|
|
|
h.ServeHTTP(rw, r2)
|
|
} else {
|
|
h.ServeHTTP(rw, req)
|
|
}
|
|
})
|
|
}
|
|
|
|
// When go receives an HTTP request, it assumes the absence of fragment URL.
|
|
// However, it is still possible to send a fragment in the request.
|
|
// In this case, Traefik will encode the '#' character, altering the request's intended meaning.
|
|
// To avoid this behavior, the following function rejects requests that include a fragment in the URL.
|
|
func denyFragment(h http.Handler) http.Handler {
|
|
return http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
|
|
if strings.Contains(req.URL.RawPath, "#") {
|
|
log.WithoutContext().Debugf("Rejecting request because it contains a fragment in the URL path: %s", req.URL.RawPath)
|
|
rw.WriteHeader(http.StatusBadRequest)
|
|
|
|
return
|
|
}
|
|
|
|
h.ServeHTTP(rw, req)
|
|
})
|
|
}
|