420 lines
15 KiB
Go
420 lines
15 KiB
Go
package tcp
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import (
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"context"
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"crypto/tls"
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"errors"
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"fmt"
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"net/http"
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"github.com/rs/zerolog/log"
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"github.com/traefik/traefik/v3/pkg/config/runtime"
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"github.com/traefik/traefik/v3/pkg/logs"
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"github.com/traefik/traefik/v3/pkg/middlewares/snicheck"
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httpmuxer "github.com/traefik/traefik/v3/pkg/muxer/http"
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tcpmuxer "github.com/traefik/traefik/v3/pkg/muxer/tcp"
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"github.com/traefik/traefik/v3/pkg/server/provider"
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tcpservice "github.com/traefik/traefik/v3/pkg/server/service/tcp"
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"github.com/traefik/traefik/v3/pkg/tcp"
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traefiktls "github.com/traefik/traefik/v3/pkg/tls"
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)
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type middlewareBuilder interface {
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BuildChain(ctx context.Context, names []string) *tcp.Chain
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}
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// NewManager Creates a new Manager.
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func NewManager(conf *runtime.Configuration,
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serviceManager *tcpservice.Manager,
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middlewaresBuilder middlewareBuilder,
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httpHandlers map[string]http.Handler,
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httpsHandlers map[string]http.Handler,
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tlsManager *traefiktls.Manager,
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) *Manager {
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return &Manager{
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serviceManager: serviceManager,
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middlewaresBuilder: middlewaresBuilder,
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httpHandlers: httpHandlers,
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httpsHandlers: httpsHandlers,
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tlsManager: tlsManager,
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conf: conf,
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}
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}
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// Manager is a route/router manager.
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type Manager struct {
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serviceManager *tcpservice.Manager
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middlewaresBuilder middlewareBuilder
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httpHandlers map[string]http.Handler
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httpsHandlers map[string]http.Handler
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tlsManager *traefiktls.Manager
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conf *runtime.Configuration
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}
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func (m *Manager) getTCPRouters(ctx context.Context, entryPoints []string) map[string]map[string]*runtime.TCPRouterInfo {
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if m.conf != nil {
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return m.conf.GetTCPRoutersByEntryPoints(ctx, entryPoints)
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}
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return make(map[string]map[string]*runtime.TCPRouterInfo)
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}
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func (m *Manager) getHTTPRouters(ctx context.Context, entryPoints []string, tls bool) map[string]map[string]*runtime.RouterInfo {
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if m.conf != nil {
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return m.conf.GetRoutersByEntryPoints(ctx, entryPoints, tls)
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}
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return make(map[string]map[string]*runtime.RouterInfo)
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}
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// BuildHandlers builds the handlers for the given entrypoints.
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func (m *Manager) BuildHandlers(rootCtx context.Context, entryPoints []string) map[string]*Router {
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entryPointsRouters := m.getTCPRouters(rootCtx, entryPoints)
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entryPointsRoutersHTTP := m.getHTTPRouters(rootCtx, entryPoints, true)
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entryPointHandlers := make(map[string]*Router)
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for _, entryPointName := range entryPoints {
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entryPointName := entryPointName
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routers := entryPointsRouters[entryPointName]
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logger := log.Ctx(rootCtx).With().Str(logs.EntryPointName, entryPointName).Logger()
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ctx := logger.WithContext(rootCtx)
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handler, err := m.buildEntryPointHandler(ctx, routers, entryPointsRoutersHTTP[entryPointName], m.httpHandlers[entryPointName], m.httpsHandlers[entryPointName])
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if err != nil {
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logger.Error().Err(err).Send()
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continue
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}
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entryPointHandlers[entryPointName] = handler
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}
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return entryPointHandlers
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}
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type nameAndConfig struct {
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routerName string // just so we have it as additional information when logging
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TLSConfig *tls.Config
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}
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func (m *Manager) buildEntryPointHandler(ctx context.Context, configs map[string]*runtime.TCPRouterInfo, configsHTTP map[string]*runtime.RouterInfo, handlerHTTP, handlerHTTPS http.Handler) (*Router, error) {
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// Build a new Router.
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router, err := NewRouter()
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if err != nil {
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return nil, err
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}
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router.SetHTTPHandler(handlerHTTP)
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// Even though the error is seemingly ignored (aside from logging it),
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// we actually rely later on the fact that a tls config is nil (which happens when an error is returned) to take special steps
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// when assigning a handler to a route.
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defaultTLSConf, err := m.tlsManager.Get(traefiktls.DefaultTLSStoreName, traefiktls.DefaultTLSConfigName)
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if err != nil {
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log.Ctx(ctx).Error().Err(err).Msg("Error during the build of the default TLS configuration")
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}
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// Keyed by domain. The source of truth for doing SNI checking (domain fronting).
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// As soon as there's (at least) two different tlsOptions found for the same domain,
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// we set the value to the default TLS conf.
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tlsOptionsForHost := map[string]string{}
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// Keyed by domain, then by options reference.
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// The actual source of truth for what TLS options will actually be used for the connection.
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// As opposed to tlsOptionsForHost, it keeps track of all the (different) TLS
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// options that occur for a given host name, so that later on we can set relevant
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// errors and logging for all the routers concerned (i.e. wrongly configured).
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tlsOptionsForHostSNI := map[string]map[string]nameAndConfig{}
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for routerHTTPName, routerHTTPConfig := range configsHTTP {
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if routerHTTPConfig.TLS == nil {
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continue
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}
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logger := log.Ctx(ctx).With().Str(logs.RouterName, routerHTTPName).Logger()
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ctxRouter := logger.WithContext(provider.AddInContext(ctx, routerHTTPName))
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tlsOptionsName := traefiktls.DefaultTLSConfigName
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if len(routerHTTPConfig.TLS.Options) > 0 && routerHTTPConfig.TLS.Options != traefiktls.DefaultTLSConfigName {
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tlsOptionsName = provider.GetQualifiedName(ctxRouter, routerHTTPConfig.TLS.Options)
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}
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domains, err := httpmuxer.ParseDomains(routerHTTPConfig.Rule)
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if err != nil {
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routerErr := fmt.Errorf("invalid rule %s, error: %w", routerHTTPConfig.Rule, err)
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routerHTTPConfig.AddError(routerErr, true)
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logger.Error().Err(routerErr).Send()
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continue
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}
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if len(domains) == 0 {
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// Extra Host(*) rule, for HTTPS routers with no Host rule,
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// and for requests for which the SNI does not match _any_ of the other existing routers Host.
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// This is only about choosing the TLS configuration.
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// The actual routing will be done further on by the HTTPS handler.
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// See examples below.
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router.AddHTTPTLSConfig("*", defaultTLSConf)
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// The server name (from a Host(SNI) rule) is the only parameter (available in HTTP routing rules) on which we can map a TLS config,
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// because it is the only one accessible before decryption (we obtain it during the ClientHello).
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// Therefore, when a router has no Host rule, it does not make any sense to specify some TLS options.
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// Consequently, when it comes to deciding what TLS config will be used,
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// for a request that will match an HTTPS router with no Host rule,
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// the result will depend on the _others_ existing routers (their Host rule, to be precise), and the TLS options associated with them,
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// even though they don't match the incoming request. Consider the following examples:
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// # conf1
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// httpRouter1:
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// rule: PathPrefix("/foo")
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// # Wherever the request comes from, the TLS config used will be the default one, because of the Host(*) fallback.
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// # conf2
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// httpRouter1:
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// rule: PathPrefix("/foo")
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//
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// httpRouter2:
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// rule: Host("foo.com") && PathPrefix("/bar")
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// tlsoptions: myTLSOptions
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// # When a request for "/foo" comes, even though it won't be routed by httpRouter2,
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// # if its SNI is set to foo.com, myTLSOptions will be used for the TLS connection.
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// # Otherwise, it will fallback to the default TLS config.
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logger.Warn().Msgf("No domain found in rule %v, the TLS options applied for this router will depend on the SNI of each request", routerHTTPConfig.Rule)
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}
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// Even though the error is seemingly ignored (aside from logging it),
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// we actually rely later on the fact that a tls config is nil (which happens when an error is returned) to take special steps
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// when assigning a handler to a route.
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tlsConf, tlsConfErr := m.tlsManager.Get(traefiktls.DefaultTLSStoreName, tlsOptionsName)
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if tlsConfErr != nil {
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// Note: we do not call AddError here because we already did so when buildRouterHandler errored for the same reason.
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logger.Error().Err(tlsConfErr).Send()
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}
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for _, domain := range domains {
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// domain is already in lower case thanks to the domain parsing
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if tlsOptionsForHostSNI[domain] == nil {
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tlsOptionsForHostSNI[domain] = make(map[string]nameAndConfig)
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}
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tlsOptionsForHostSNI[domain][tlsOptionsName] = nameAndConfig{
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routerName: routerHTTPName,
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TLSConfig: tlsConf,
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}
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if name, ok := tlsOptionsForHost[domain]; ok && name != tlsOptionsName {
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// Different tlsOptions on the same domain, so fallback to default
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tlsOptionsForHost[domain] = traefiktls.DefaultTLSConfigName
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} else {
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tlsOptionsForHost[domain] = tlsOptionsName
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}
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}
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}
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sniCheck := snicheck.New(tlsOptionsForHost, handlerHTTPS)
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// Keep in mind that defaultTLSConf might be nil here.
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router.SetHTTPSHandler(sniCheck, defaultTLSConf)
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logger := log.Ctx(ctx)
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for hostSNI, tlsConfigs := range tlsOptionsForHostSNI {
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if len(tlsConfigs) == 1 {
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var optionsName string
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var config *tls.Config
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for k, v := range tlsConfigs {
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optionsName = k
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config = v.TLSConfig
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break
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}
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if config == nil {
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// we use nil config as a signal to insert a handler
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// that enforces that TLS connection attempts to the corresponding (broken) router should fail.
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logger.Debug().Msgf("Adding special closing route for %s because broken TLS options %s", hostSNI, optionsName)
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router.AddHTTPTLSConfig(hostSNI, nil)
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continue
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}
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logger.Debug().Msgf("Adding route for %s with TLS options %s", hostSNI, optionsName)
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router.AddHTTPTLSConfig(hostSNI, config)
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continue
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}
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// multiple tlsConfigs
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routers := make([]string, 0, len(tlsConfigs))
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for _, v := range tlsConfigs {
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configsHTTP[v.routerName].AddError(fmt.Errorf("found different TLS options for routers on the same host %v, so using the default TLS options instead", hostSNI), false)
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routers = append(routers, v.routerName)
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}
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logger.Warn().Msgf("Found different TLS options for routers on the same host %v, so using the default TLS options instead for these routers: %#v", hostSNI, routers)
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if defaultTLSConf == nil {
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logger.Debug().Msgf("Adding special closing route for %s because broken default TLS options", hostSNI)
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}
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router.AddHTTPTLSConfig(hostSNI, defaultTLSConf)
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}
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m.addTCPHandlers(ctx, configs, router)
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return router, nil
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}
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// addTCPHandlers creates the TCP handlers defined in configs, and adds them to router.
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func (m *Manager) addTCPHandlers(ctx context.Context, configs map[string]*runtime.TCPRouterInfo, router *Router) {
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for routerName, routerConfig := range configs {
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logger := log.Ctx(ctx).With().Str(logs.RouterName, routerName).Logger()
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ctxRouter := logger.WithContext(provider.AddInContext(ctx, routerName))
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if routerConfig.Priority == 0 {
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routerConfig.Priority = tcpmuxer.GetRulePriority(routerConfig.Rule)
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}
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if routerConfig.Service == "" {
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err := errors.New("the service is missing on the router")
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routerConfig.AddError(err, true)
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logger.Error().Err(err).Send()
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continue
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}
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if routerConfig.Rule == "" {
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err := errors.New("router has no rule")
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routerConfig.AddError(err, true)
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logger.Error().Err(err).Send()
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continue
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}
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domains, err := tcpmuxer.ParseHostSNI(routerConfig.Rule)
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if err != nil {
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routerErr := fmt.Errorf("invalid rule: %q , %w", routerConfig.Rule, err)
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routerConfig.AddError(routerErr, true)
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logger.Error().Err(routerErr).Send()
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continue
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}
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// HostSNI Rule, but TLS not set on the router, which is an error.
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// However, we allow the HostSNI(*) exception.
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if len(domains) > 0 && routerConfig.TLS == nil && domains[0] != "*" {
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routerErr := fmt.Errorf("invalid rule: %q , has HostSNI matcher, but no TLS on router", routerConfig.Rule)
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routerConfig.AddError(routerErr, true)
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logger.Error().Err(routerErr).Send()
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}
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var handler tcp.Handler
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if routerConfig.TLS == nil || routerConfig.TLS.Passthrough {
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handler, err = m.buildTCPHandler(ctxRouter, routerConfig)
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if err != nil {
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routerConfig.AddError(err, true)
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logger.Error().Err(err).Send()
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continue
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}
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}
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if routerConfig.TLS == nil {
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logger.Debug().Msgf("Adding route for %q", routerConfig.Rule)
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if err := router.muxerTCP.AddRoute(routerConfig.Rule, routerConfig.RuleSyntax, routerConfig.Priority, handler); err != nil {
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routerConfig.AddError(err, true)
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logger.Error().Err(err).Send()
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}
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continue
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}
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if routerConfig.TLS.Passthrough {
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logger.Debug().Msgf("Adding Passthrough route for %q", routerConfig.Rule)
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if err := router.muxerTCPTLS.AddRoute(routerConfig.Rule, routerConfig.RuleSyntax, routerConfig.Priority, handler); err != nil {
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routerConfig.AddError(err, true)
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logger.Error().Err(err).Send()
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}
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continue
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}
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for _, domain := range domains {
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if httpmuxer.IsASCII(domain) {
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continue
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}
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asciiError := fmt.Errorf("invalid domain name value %q, non-ASCII characters are not allowed", domain)
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routerConfig.AddError(asciiError, true)
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logger.Error().Err(asciiError).Send()
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}
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tlsOptionsName := routerConfig.TLS.Options
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if len(tlsOptionsName) == 0 {
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tlsOptionsName = traefiktls.DefaultTLSConfigName
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}
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if tlsOptionsName != traefiktls.DefaultTLSConfigName {
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tlsOptionsName = provider.GetQualifiedName(ctxRouter, tlsOptionsName)
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}
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tlsConf, err := m.tlsManager.Get(traefiktls.DefaultTLSStoreName, tlsOptionsName)
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if err != nil {
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routerConfig.AddError(err, true)
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logger.Error().Err(err).Send()
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logger.Debug().Msgf("Adding special TLS closing route for %q because broken TLS options %s", routerConfig.Rule, tlsOptionsName)
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if err := router.muxerTCPTLS.AddRoute(routerConfig.Rule, routerConfig.RuleSyntax, routerConfig.Priority, &brokenTLSRouter{}); err != nil {
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routerConfig.AddError(err, true)
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logger.Error().Err(err).Send()
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}
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continue
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}
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// Now that the Rule is not just about the Host, we could theoretically have a config like:
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// router1:
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// rule: HostSNI(foo.com) && ClientIP(IP1)
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// tlsOption: tlsOne
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// router2:
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// rule: HostSNI(foo.com) && ClientIP(IP2)
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// tlsOption: tlsTwo
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// i.e. same HostSNI but different tlsOptions
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// This is only applicable if the muxer can decide about the routing _before_ telling the client about the tlsConf (i.e. before the TLS HandShake).
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// This seems to be the case so far with the existing matchers (HostSNI, and ClientIP), so it's all good.
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// Otherwise, we would have to do as for HTTPS, i.e. disallow different TLS configs for the same HostSNIs.
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handler, err = m.buildTCPHandler(ctxRouter, routerConfig)
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if err != nil {
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routerConfig.AddError(err, true)
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logger.Error().Err(err).Send()
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continue
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}
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handler = &tcp.TLSHandler{
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Next: handler,
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Config: tlsConf,
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}
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logger.Debug().Msgf("Adding TLS route for %q", routerConfig.Rule)
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if err := router.muxerTCPTLS.AddRoute(routerConfig.Rule, routerConfig.RuleSyntax, routerConfig.Priority, handler); err != nil {
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routerConfig.AddError(err, true)
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logger.Error().Err(err).Send()
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continue
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}
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}
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}
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func (m *Manager) buildTCPHandler(ctx context.Context, router *runtime.TCPRouterInfo) (tcp.Handler, error) {
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var qualifiedNames []string
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for _, name := range router.Middlewares {
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qualifiedNames = append(qualifiedNames, provider.GetQualifiedName(ctx, name))
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}
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router.Middlewares = qualifiedNames
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if router.Service == "" {
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return nil, errors.New("the service is missing on the router")
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}
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sHandler, err := m.serviceManager.BuildTCP(ctx, router.Service)
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if err != nil {
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return nil, err
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}
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mHandler := m.middlewaresBuilder.BuildChain(ctx, router.Middlewares)
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return tcp.NewChain().Extend(*mHandler).Then(sHandler)
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}
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