295 lines
8.3 KiB
Go
295 lines
8.3 KiB
Go
package service
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import (
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"context"
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"crypto/tls"
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"crypto/x509"
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"errors"
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"fmt"
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"net"
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"net/http"
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"reflect"
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"slices"
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"strings"
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"sync"
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"time"
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"github.com/rs/zerolog/log"
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"github.com/spiffe/go-spiffe/v2/bundle/x509bundle"
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"github.com/spiffe/go-spiffe/v2/spiffeid"
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"github.com/spiffe/go-spiffe/v2/spiffetls/tlsconfig"
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"github.com/spiffe/go-spiffe/v2/svid/x509svid"
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"github.com/traefik/traefik/v3/pkg/config/dynamic"
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traefiktls "github.com/traefik/traefik/v3/pkg/tls"
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"github.com/traefik/traefik/v3/pkg/types"
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"golang.org/x/net/http2"
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)
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type h2cTransportWrapper struct {
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*http2.Transport
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}
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func (t *h2cTransportWrapper) RoundTrip(req *http.Request) (*http.Response, error) {
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req.URL.Scheme = "http"
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return t.Transport.RoundTrip(req)
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}
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// SpiffeX509Source allows to retrieve a x509 SVID and bundle.
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type SpiffeX509Source interface {
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x509svid.Source
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x509bundle.Source
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}
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// NewRoundTripperManager creates a new RoundTripperManager.
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func NewRoundTripperManager(spiffeX509Source SpiffeX509Source) *RoundTripperManager {
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return &RoundTripperManager{
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roundTrippers: make(map[string]http.RoundTripper),
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configs: make(map[string]*dynamic.ServersTransport),
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spiffeX509Source: spiffeX509Source,
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}
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}
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// RoundTripperManager handles roundtripper for the reverse proxy.
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type RoundTripperManager struct {
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rtLock sync.RWMutex
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roundTrippers map[string]http.RoundTripper
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configs map[string]*dynamic.ServersTransport
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spiffeX509Source SpiffeX509Source
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}
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// Update updates the roundtrippers configurations.
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func (r *RoundTripperManager) Update(newConfigs map[string]*dynamic.ServersTransport) {
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r.rtLock.Lock()
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defer r.rtLock.Unlock()
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for configName, config := range r.configs {
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newConfig, ok := newConfigs[configName]
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if !ok {
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delete(r.configs, configName)
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delete(r.roundTrippers, configName)
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continue
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}
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if reflect.DeepEqual(newConfig, config) {
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continue
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}
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var err error
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r.roundTrippers[configName], err = r.createRoundTripper(newConfig)
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if err != nil {
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log.Error().Err(err).Msgf("Could not configure HTTP Transport %s, fallback on default transport", configName)
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r.roundTrippers[configName] = http.DefaultTransport
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}
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}
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for newConfigName, newConfig := range newConfigs {
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if _, ok := r.configs[newConfigName]; ok {
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continue
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}
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var err error
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r.roundTrippers[newConfigName], err = r.createRoundTripper(newConfig)
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if err != nil {
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log.Error().Err(err).Msgf("Could not configure HTTP Transport %s, fallback on default transport", newConfigName)
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r.roundTrippers[newConfigName] = http.DefaultTransport
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}
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}
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r.configs = newConfigs
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}
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// Get gets a roundtripper by name.
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func (r *RoundTripperManager) Get(name string) (http.RoundTripper, error) {
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if len(name) == 0 {
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name = "default@internal"
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}
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r.rtLock.RLock()
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defer r.rtLock.RUnlock()
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if rt, ok := r.roundTrippers[name]; ok {
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return rt, nil
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}
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return nil, fmt.Errorf("servers transport not found %s", name)
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}
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// createRoundTripper creates an http.RoundTripper configured with the Transport configuration settings.
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// For the settings that can't be configured in Traefik it uses the default http.Transport settings.
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// An exception to this is the MaxIdleConns setting as we only provide the option MaxIdleConnsPerHost in Traefik at this point in time.
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// Setting this value to the default of 100 could lead to confusing behavior and backwards compatibility issues.
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func (r *RoundTripperManager) createRoundTripper(cfg *dynamic.ServersTransport) (http.RoundTripper, error) {
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if cfg == nil {
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return nil, errors.New("no transport configuration given")
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}
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dialer := &net.Dialer{
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Timeout: 30 * time.Second,
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KeepAlive: 30 * time.Second,
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}
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if cfg.ForwardingTimeouts != nil {
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dialer.Timeout = time.Duration(cfg.ForwardingTimeouts.DialTimeout)
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}
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transport := &http.Transport{
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Proxy: http.ProxyFromEnvironment,
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DialContext: dialer.DialContext,
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MaxIdleConnsPerHost: cfg.MaxIdleConnsPerHost,
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IdleConnTimeout: 90 * time.Second,
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TLSHandshakeTimeout: 10 * time.Second,
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ExpectContinueTimeout: 1 * time.Second,
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ReadBufferSize: 64 * 1024,
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WriteBufferSize: 64 * 1024,
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}
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if cfg.ForwardingTimeouts != nil {
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transport.ResponseHeaderTimeout = time.Duration(cfg.ForwardingTimeouts.ResponseHeaderTimeout)
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transport.IdleConnTimeout = time.Duration(cfg.ForwardingTimeouts.IdleConnTimeout)
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}
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if cfg.Spiffe != nil {
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if r.spiffeX509Source == nil {
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return nil, errors.New("SPIFFE is enabled for this transport, but not configured")
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}
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spiffeAuthorizer, err := buildSpiffeAuthorizer(cfg.Spiffe)
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if err != nil {
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return nil, fmt.Errorf("unable to build SPIFFE authorizer: %w", err)
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}
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transport.TLSClientConfig = tlsconfig.MTLSClientConfig(r.spiffeX509Source, r.spiffeX509Source, spiffeAuthorizer)
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}
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if cfg.InsecureSkipVerify || len(cfg.RootCAs) > 0 || len(cfg.ServerName) > 0 || len(cfg.Certificates) > 0 || cfg.PeerCertURI != "" {
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if transport.TLSClientConfig != nil {
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return nil, errors.New("TLS and SPIFFE configuration cannot be defined at the same time")
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}
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transport.TLSClientConfig = &tls.Config{
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ServerName: cfg.ServerName,
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InsecureSkipVerify: cfg.InsecureSkipVerify,
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RootCAs: createRootCACertPool(cfg.RootCAs),
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Certificates: cfg.Certificates.GetCertificates(),
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}
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if cfg.PeerCertURI != "" {
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transport.TLSClientConfig.VerifyPeerCertificate = func(rawCerts [][]byte, _ [][]*x509.Certificate) error {
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return traefiktls.VerifyPeerCertificate(cfg.PeerCertURI, transport.TLSClientConfig, rawCerts)
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}
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}
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}
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// Return directly HTTP/1.1 transport when HTTP/2 is disabled
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if cfg.DisableHTTP2 {
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return &KerberosRoundTripper{
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OriginalRoundTripper: transport,
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new: func() http.RoundTripper {
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return transport.Clone()
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},
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}, nil
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}
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rt, err := newSmartRoundTripper(transport, cfg.ForwardingTimeouts)
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if err != nil {
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return nil, err
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}
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return &KerberosRoundTripper{
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OriginalRoundTripper: rt,
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new: func() http.RoundTripper {
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return rt.Clone()
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},
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}, nil
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}
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type KerberosRoundTripper struct {
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new func() http.RoundTripper
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OriginalRoundTripper http.RoundTripper
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}
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type stickyRoundTripper struct {
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RoundTripper http.RoundTripper
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}
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type transportKeyType string
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var transportKey transportKeyType = "transport"
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func AddTransportOnContext(ctx context.Context) context.Context {
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return context.WithValue(ctx, transportKey, &stickyRoundTripper{})
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}
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func (k *KerberosRoundTripper) RoundTrip(request *http.Request) (*http.Response, error) {
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value, ok := request.Context().Value(transportKey).(*stickyRoundTripper)
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if !ok {
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return k.OriginalRoundTripper.RoundTrip(request)
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}
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if value.RoundTripper != nil {
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return value.RoundTripper.RoundTrip(request)
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}
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resp, err := k.OriginalRoundTripper.RoundTrip(request)
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// If we found that we are authenticating with Kerberos (Negotiate) or NTLM.
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// We put a dedicated roundTripper in the ConnContext.
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// This will stick the next calls to the same connection with the backend.
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if err == nil && containsNTLMorNegotiate(resp.Header.Values("WWW-Authenticate")) {
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value.RoundTripper = k.new()
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}
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return resp, err
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}
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func containsNTLMorNegotiate(h []string) bool {
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return slices.ContainsFunc(h, func(s string) bool {
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return strings.HasPrefix(s, "NTLM") || strings.HasPrefix(s, "Negotiate")
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})
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}
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func createRootCACertPool(rootCAs []types.FileOrContent) *x509.CertPool {
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if len(rootCAs) == 0 {
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return nil
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}
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roots := x509.NewCertPool()
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for _, cert := range rootCAs {
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certContent, err := cert.Read()
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if err != nil {
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log.Error().Err(err).Msg("Error while read RootCAs")
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continue
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}
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roots.AppendCertsFromPEM(certContent)
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}
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return roots
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}
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func buildSpiffeAuthorizer(cfg *dynamic.Spiffe) (tlsconfig.Authorizer, error) {
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switch {
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case len(cfg.IDs) > 0:
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spiffeIDs := make([]spiffeid.ID, 0, len(cfg.IDs))
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for _, rawID := range cfg.IDs {
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id, err := spiffeid.FromString(rawID)
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if err != nil {
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return nil, fmt.Errorf("invalid SPIFFE ID: %w", err)
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}
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spiffeIDs = append(spiffeIDs, id)
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}
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return tlsconfig.AuthorizeOneOf(spiffeIDs...), nil
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case cfg.TrustDomain != "":
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trustDomain, err := spiffeid.TrustDomainFromString(cfg.TrustDomain)
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if err != nil {
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return nil, fmt.Errorf("invalid SPIFFE trust domain: %w", err)
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}
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return tlsconfig.AuthorizeMemberOf(trustDomain), nil
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default:
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return tlsconfig.AuthorizeAny(), nil
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}
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}
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