Merge current v2.9 into master

CHANGELOG.md

@@ -1,3 +1,22 @@
+## [v2.9.6](https://github.com/traefik/traefik/tree/v2.9.6) (2022-12-07)
+[All Commits](https://github.com/traefik/traefik/compare/v2.9.5...v2.9.6)
+
+**Bug fixes:**
+- **[acme]** Update go-acme/lego to v4.9.1 ([#9550](https://github.com/traefik/traefik/pull/9550) by [ldez](https://github.com/ldez))
+- **[k8s/crd]** Support of allowEmptyServices in TraefikService ([#9424](https://github.com/traefik/traefik/pull/9424) by [jeromeguiard](https://github.com/jeromeguiard))
+- **[logs]** Remove logs of the request ([#9574](https://github.com/traefik/traefik/pull/9574) by [ldez](https://github.com/ldez))
+- **[plugins]** Increase the timeout on plugin download ([#9529](https://github.com/traefik/traefik/pull/9529) by [ldez](https://github.com/ldez))
+- **[server]** Update golang.org/x/net ([#9582](https://github.com/traefik/traefik/pull/9582) by [ldez](https://github.com/ldez))
+- **[tls]** Handle broken TLS conf better ([#9572](https://github.com/traefik/traefik/pull/9572) by [mpl](https://github.com/mpl))
+- **[tracing]** Update DataDog tracing dependency to v1.43.1 ([#9526](https://github.com/traefik/traefik/pull/9526) by [rtribotte](https://github.com/rtribotte))
+- **[webui]** Add missing serialNumber passTLSClientCert option to middleware panel ([#9539](https://github.com/traefik/traefik/pull/9539) by [rtribotte](https://github.com/rtribotte))
+
+**Documentation:**
+- **[docker]** Add networking example ([#9542](https://github.com/traefik/traefik/pull/9542) by [Janik-Haag](https://github.com/Janik-Haag))
+- **[hub]** Add information about the Hub Agent ([#9560](https://github.com/traefik/traefik/pull/9560) by [nmengin](https://github.com/nmengin))
+- **[k8s/helm]** Update Helm installation section ([#9564](https://github.com/traefik/traefik/pull/9564) by [mloiseleur](https://github.com/mloiseleur))
+- **[middleware]** Clarify PathPrefix matcher greediness ([#9519](https://github.com/traefik/traefik/pull/9519) by [mpl](https://github.com/mpl))
+
 ## [v3.0.0-beta1](https://github.com/traefik/traefik/tree/v3.0.0-beta1) (2022-12-05)
 [All Commits](https://github.com/traefik/traefik/compare/v2.9.0-rc1...v3.0.0-beta1)
 

go.mod

@@ -91,8 +91,8 @@ require (
 	go.opentelemetry.io/otel/trace v1.11.1
 	golang.org/x/exp v0.0.0-20221114191408-850992195362
 	golang.org/x/mod v0.6.0
-	golang.org/x/net v0.1.0
+	golang.org/x/net v0.3.1-0.20221206200815-1e63c2f08a10
-	golang.org/x/text v0.4.0
+	golang.org/x/text v0.5.0
 	golang.org/x/time v0.0.0-20220609170525-579cf78fd858
 	golang.org/x/tools v0.2.0
 	google.golang.org/grpc v1.50.1
@@ -360,8 +360,8 @@ require (
 	golang.org/x/lint v0.0.0-20210508222113-6edffad5e616 // indirect
 	golang.org/x/oauth2 v0.0.0-20220909003341-f21342109be1 // indirect
 	golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4 // indirect
-	golang.org/x/sys v0.1.0 // indirect
+	golang.org/x/sys v0.3.0 // indirect
-	golang.org/x/term v0.1.0 // indirect
+	golang.org/x/term v0.3.0 // indirect
 	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
 	google.golang.org/api v0.57.0 // indirect
 	google.golang.org/appengine v1.6.7 // indirect

go.sum

@@ -2224,8 +2224,8 @@ golang.org/x/net v0.0.0-20211216030914-fe4d6282115f/go.mod h1:9nx3DQGgdP8bBQD5qx
 golang.org/x/net v0.0.0-20220127200216-cd36cc0744dd/go.mod h1:CfG3xpIq0wQ8r1q4Su4UZFWDARRcnwPjda9FqA0JpMk=
 golang.org/x/net v0.0.0-20220225172249-27dd8689420f/go.mod h1:CfG3xpIq0wQ8r1q4Su4UZFWDARRcnwPjda9FqA0JpMk=
 golang.org/x/net v0.0.0-20220624214902-1bab6f366d9e/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
-golang.org/x/net v0.1.0 h1:hZ/3BUoy5aId7sCpA/Tc5lt8DkFgdVS2onTpJsZ/fl0=
+golang.org/x/net v0.3.1-0.20221206200815-1e63c2f08a10 h1:Frnccbp+ok2GkUS2tC84yAq/U9Vg+0sIO7aRL3T4Xnc=
-golang.org/x/net v0.1.0/go.mod h1:Cx3nUiGt4eDBEyega/BKRp+/AlGL8hYe7U9odMt2Cco=
+golang.org/x/net v0.3.1-0.20221206200815-1e63c2f08a10/go.mod h1:MBQ8lrhLObU/6UmLb4fmbmk5OcyYmqtbGd/9yIeKjEE=
 golang.org/x/oauth2 v0.0.0-20180724155351-3d292e4d0cdc/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/oauth2 v0.0.0-20181017192945-9dcd33a902f4/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
@@ -2395,14 +2395,14 @@ golang.org/x/sys v0.0.0-20220412211240-33da011f77ad/go.mod h1:oPkhp1MJrh7nUepCBc
 golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.1.0 h1:kunALQeHf1/185U1i0GOB/fy1IPRDDpuoOOqRReG57U=
+golang.org/x/sys v0.3.0 h1:w8ZOecv6NaNa/zC8944JTU3vz4u6Lagfk4RPQxv92NQ=
-golang.org/x/sys v0.1.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.3.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/term v0.0.0-20201117132131-f5c789dd3221/go.mod h1:Nr5EML6q2oocZ2LXRh80K7BxOlk5/8JxuGnuhpl+muw=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/term v0.0.0-20210220032956-6a3ed077a48d/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
-golang.org/x/term v0.1.0 h1:g6Z6vPFA9dYBAF7DWcH6sCcOntplXsDKcliusYijMlw=
+golang.org/x/term v0.3.0 h1:qoo4akIqOcDME5bhc/NgxUdovd6BSS2uMsVjB56q1xI=
-golang.org/x/term v0.1.0/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
+golang.org/x/term v0.3.0/go.mod h1:q750SLmJuPmVoN1blW3UFBPREJfb1KmY3vwxfr+nFDA=
 golang.org/x/text v0.0.0-20160726164857-2910a502d2bf/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
@@ -2413,8 +2413,8 @@ golang.org/x/text v0.3.4/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.5/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
-golang.org/x/text v0.4.0 h1:BrVqGRd7+k1DiOgtnFvAkoQEWQvBc25ouMJM6429SFg=
+golang.org/x/text v0.5.0 h1:OLmvp0KP+FVG99Ct/qFiL/Fhk4zp4QQnZ7b2U+5piUM=
-golang.org/x/text v0.4.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
+golang.org/x/text v0.5.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
 golang.org/x/time v0.0.0-20180412165947-fbb02b2291d2/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/time v0.0.0-20181108054448-85acf8d2951c/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/time v0.0.0-20190308202827-9d24e82272b4/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=

integration/fixtures/https/https_invalid_tls_options.toml

@@ -0,0 +1,60 @@
+[global]
+  checkNewVersion = false
+  sendAnonymousUsage = false
+
+[log]
+  level = "DEBUG"
+
+[entryPoints.websecure]
+  address = ":4443"
+
+[api]
+  insecure = true
+
+[providers.file]
+  filename = "{{ .SelfFilename }}"
+
+## dynamic configuration ##
+
+[http.routers]
+
+  [http.routers.router1]
+    entryPoints = ["websecure"]
+    service = "service1"
+    rule = "Host(`snitest.com`)"
+    [http.routers.router1.tls]
+      options = "invalidTLSOptions"
+
+  [http.routers.router2]
+    entryPoints = ["websecure"]
+    service = "service1"
+    rule = "Host(`snitest.org`)"
+    [http.routers.router2.tls]
+
+  # fallback router
+  [http.routers.router3]
+    entryPoints = ["websecure"]
+    service = "service1"
+    rule = "Path(`/`)"
+    [http.routers.router3.tls]
+
+[[http.services.service1.loadBalancer.servers]]
+  url = "http://127.0.0.1:9010"
+
+[[tls.certificates]]
+  certFile = "fixtures/https/snitest.com.cert"
+  keyFile = "fixtures/https/snitest.com.key"
+
+[[tls.certificates]]
+  certFile = "fixtures/https/snitest.org.cert"
+  keyFile = "fixtures/https/snitest.org.key"
+
+[tls.options]
+
+  [tls.options.default.clientAuth]
+    # Missing caFile to have an invalid mTLS configuration.
+    clientAuthType = "RequireAndVerifyClientCert"
+
+  [tls.options.invalidTLSOptions.clientAuth]
+    # Missing caFile to have an invalid mTLS configuration.
+    clientAuthType = "RequireAndVerifyClientCert"

integration/fixtures/tcp/multi-tls-options.toml

@@ -34,6 +34,13 @@
       [tcp.routers.to-whoami-sni-strict.tls]
         options = "bar"
 
+    [tcp.routers.to-whoami-invalid-tls]
+      rule = "HostSNI(`whoami-i.test`)"
+      service = "whoami-no-cert"
+      entryPoints = [ "tcp" ]
+      [tcp.routers.to-whoami-invalid-tls.tls]
+        options = "invalid"
+
     [tcp.services.whoami-no-cert]
       [tcp.services.whoami-no-cert.loadBalancer]
         [[tcp.services.whoami-no-cert.loadBalancer.servers]]
@@ -46,3 +53,7 @@
 
   [tls.options.bar]
     minVersion = "VersionTLS13"
+
+  [tls.options.invalid.clientAuth]
+    # Missing CA files to have an invalid mTLS configuration.
+    clientAuthType = "RequireAndVerifyClientCert"

integration/https_test.go

@@ -1226,3 +1226,53 @@ func (s *HTTPSSuite) TestWithDomainFronting(c *check.C) {
 		c.Assert(err, checker.IsNil)
 	}
 }
+
+// TestWithInvalidTLSOption verifies the behavior when using an invalid tlsOption configuration.
+func (s *HTTPSSuite) TestWithInvalidTLSOption(c *check.C) {
+	backend := startTestServer("9010", http.StatusOK, "server1")
+	defer backend.Close()
+
+	file := s.adaptFile(c, "fixtures/https/https_invalid_tls_options.toml", struct{}{})
+	defer os.Remove(file)
+	cmd, display := s.traefikCmd(withConfigFile(file))
+	defer display(c)
+	err := cmd.Start()
+	c.Assert(err, checker.IsNil)
+	defer s.killCmd(cmd)
+
+	// wait for Traefik
+	err = try.GetRequest("http://127.0.0.1:8080/api/rawdata", 500*time.Millisecond, try.BodyContains("Host(`snitest.com`)"))
+	c.Assert(err, checker.IsNil)
+
+	testCases := []struct {
+		desc       string
+		serverName string
+	}{
+		{
+			desc:       "With invalid TLS Options specified",
+			serverName: "snitest.com",
+		},
+		{
+			desc:       "With invalid Default TLS Options",
+			serverName: "snitest.org",
+		},
+		{
+			desc: "With TLS Options without servername (fallback to default)",
+		},
+	}
+
+	for _, test := range testCases {
+		test := test
+
+		tlsConfig := &tls.Config{
+			InsecureSkipVerify: true,
+		}
+		if test.serverName != "" {
+			tlsConfig.ServerName = test.serverName
+		}
+
+		conn, err := tls.Dial("tcp", "127.0.0.1:4443", tlsConfig)
+		c.Assert(err, checker.NotNil, check.Commentf("connected to server successfully"))
+		c.Assert(conn, checker.IsNil)
+	}
+}

integration/tcp_test.go

@@ -116,6 +116,14 @@ func (s *TCPSuite) TestTLSOptions(c *check.C) {
 	_, err = guessWhoTLSMaxVersion("127.0.0.1:8093", "whoami-d.test", true, tls.VersionTLS12)
 	c.Assert(err, checker.NotNil)
 	c.Assert(err.Error(), checker.Contains, "protocol version not supported")
+
+	// Check that we can't reach a route with an invalid mTLS configuration.
+	conn, err := tls.Dial("tcp", "127.0.0.1:8093", &tls.Config{
+		ServerName:         "whoami-i.test",
+		InsecureSkipVerify: true,
+	})
+	c.Assert(conn, checker.IsNil)
+	c.Assert(err, checker.NotNil)
 }
 
 func (s *TCPSuite) TestNonTLSFallback(c *check.C) {

pkg/server/router/router.go

@@ -3,6 +3,7 @@ package router
 import (
 	"context"
 	"errors"
+	"fmt"
 	"net/http"
 
 	"github.com/containous/alice"
@@ -17,6 +18,7 @@ import (
 	httpmuxer "github.com/traefik/traefik/v2/pkg/muxer/http"
 	"github.com/traefik/traefik/v2/pkg/server/middleware"
 	"github.com/traefik/traefik/v2/pkg/server/provider"
+	"github.com/traefik/traefik/v2/pkg/tls"
 )
 
 type middlewareBuilder interface {
@@ -36,10 +38,11 @@ type Manager struct {
 	middlewaresBuilder middlewareBuilder
 	chainBuilder       *middleware.ChainBuilder
 	conf               *runtime.Configuration
+	tlsManager         *tls.Manager
 }
 
-// NewManager Creates a new Manager.
+// NewManager creates a new Manager.
-func NewManager(conf *runtime.Configuration, serviceManager serviceManager, middlewaresBuilder middlewareBuilder, chainBuilder *middleware.ChainBuilder, metricsRegistry metrics.Registry) *Manager {
+func NewManager(conf *runtime.Configuration, serviceManager serviceManager, middlewaresBuilder middlewareBuilder, chainBuilder *middleware.ChainBuilder, metricsRegistry metrics.Registry, tlsManager *tls.Manager) *Manager {
 	return &Manager{
 		routerHandlers:     make(map[string]http.Handler),
 		serviceManager:     serviceManager,
@@ -47,6 +50,7 @@ func NewManager(conf *runtime.Configuration, serviceManager serviceManager, midd
 		middlewaresBuilder: middlewaresBuilder,
 		chainBuilder:       chainBuilder,
 		conf:               conf,
+		tlsManager:         tlsManager,
 	}
 }
 
@@ -145,6 +149,17 @@ func (m *Manager) buildRouterHandler(ctx context.Context, routerName string, rou
 		return handler, nil
 	}
 
+	if routerConfig.TLS != nil {
+		// Don't build the router if the TLSOptions configuration is invalid.
+		tlsOptionsName := tls.DefaultTLSConfigName
+		if len(routerConfig.TLS.Options) > 0 && routerConfig.TLS.Options != tls.DefaultTLSConfigName {
+			tlsOptionsName = provider.GetQualifiedName(ctx, routerConfig.TLS.Options)
+		}
+		if _, err := m.tlsManager.Get(tls.DefaultTLSStoreName, tlsOptionsName); err != nil {
+			return nil, fmt.Errorf("building router handler: %w", err)
+		}
+	}
+
 	handler, err := m.buildHTTPHandler(ctx, routerConfig, routerName)
 	if err != nil {
 		return nil, err

pkg/server/router/router_test.go

@@ -22,6 +22,7 @@ import (
 	"github.com/traefik/traefik/v2/pkg/server/middleware"
 	"github.com/traefik/traefik/v2/pkg/server/service"
 	"github.com/traefik/traefik/v2/pkg/testhelpers"
+	"github.com/traefik/traefik/v2/pkg/tls"
 	"github.com/traefik/traefik/v2/pkg/types"
 )
 
@@ -319,8 +320,9 @@ func TestRouterManager_Get(t *testing.T) {
 			serviceManager := service.NewManager(rtConf.Services, nil, nil, roundTripperManager)
 			middlewaresBuilder := middleware.NewBuilder(rtConf.Middlewares, serviceManager, nil)
 			chainBuilder := middleware.NewChainBuilder(nil, nil, nil)
+			tlsManager := tls.NewManager()
 
-			routerManager := NewManager(rtConf, serviceManager, middlewaresBuilder, chainBuilder, metrics.NewVoidRegistry())
+			routerManager := NewManager(rtConf, serviceManager, middlewaresBuilder, chainBuilder, metrics.NewVoidRegistry(), tlsManager)
 
 			handlers := routerManager.BuildHandlers(context.Background(), test.entryPoints, false)
 
@@ -425,8 +427,9 @@ func TestAccessLog(t *testing.T) {
 			serviceManager := service.NewManager(rtConf.Services, nil, nil, roundTripperManager)
 			middlewaresBuilder := middleware.NewBuilder(rtConf.Middlewares, serviceManager, nil)
 			chainBuilder := middleware.NewChainBuilder(nil, nil, nil)
+			tlsManager := tls.NewManager()
 
-			routerManager := NewManager(rtConf, serviceManager, middlewaresBuilder, chainBuilder, metrics.NewVoidRegistry())
+			routerManager := NewManager(rtConf, serviceManager, middlewaresBuilder, chainBuilder, metrics.NewVoidRegistry(), tlsManager)
 
 			handlers := routerManager.BuildHandlers(context.Background(), test.entryPoints, false)
 
@@ -464,6 +467,7 @@ func TestRuntimeConfiguration(t *testing.T) {
 		serviceConfig    map[string]*dynamic.Service
 		routerConfig     map[string]*dynamic.Router
 		middlewareConfig map[string]*dynamic.Middleware
+		tlsOptions       map[string]tls.Options
 		expectedError    int
 	}{
 		{
@@ -667,7 +671,6 @@ func TestRuntimeConfiguration(t *testing.T) {
 			},
 			expectedError: 1,
 		},
-
 		{
 			desc: "Router with broken middleware",
 			serviceConfig: map[string]*dynamic.Service{
@@ -698,8 +701,71 @@ func TestRuntimeConfiguration(t *testing.T) {
 			},
 			expectedError: 2,
 		},
+		{
+			desc: "Router with broken tlsOption",
+			serviceConfig: map[string]*dynamic.Service{
+				"foo-service": {
+					LoadBalancer: &dynamic.ServersLoadBalancer{
+						Servers: []dynamic.Server{
+							{
+								URL: "http://127.0.0.1",
+							},
+						},
+					},
+				},
+			},
+			middlewareConfig: map[string]*dynamic.Middleware{},
+			routerConfig: map[string]*dynamic.Router{
+				"bar": {
+					EntryPoints: []string{"web"},
+					Service:     "foo-service",
+					Rule:        "Host(`foo.bar`)",
+					TLS: &dynamic.RouterTLSConfig{
+						Options: "broken-tlsOption",
+					},
+				},
+			},
+			tlsOptions: map[string]tls.Options{
+				"broken-tlsOption": {
+					ClientAuth: tls.ClientAuth{
+						ClientAuthType: "foobar",
+					},
+				},
+			},
+			expectedError: 1,
+		},
+		{
+			desc: "Router with broken default tlsOption",
+			serviceConfig: map[string]*dynamic.Service{
+				"foo-service": {
+					LoadBalancer: &dynamic.ServersLoadBalancer{
+						Servers: []dynamic.Server{
+							{
+								URL: "http://127.0.0.1",
+							},
+						},
+					},
+				},
+			},
+			middlewareConfig: map[string]*dynamic.Middleware{},
+			routerConfig: map[string]*dynamic.Router{
+				"bar": {
+					EntryPoints: []string{"web"},
+					Service:     "foo-service",
+					Rule:        "Host(`foo.bar`)",
+					TLS:         &dynamic.RouterTLSConfig{},
+				},
+			},
+			tlsOptions: map[string]tls.Options{
+				"default": {
+					ClientAuth: tls.ClientAuth{
+						ClientAuthType: "foobar",
+					},
+				},
+			},
+			expectedError: 1,
+		},
 	}
-
 	for _, test := range testCases {
 		test := test
 		t.Run(test.desc, func(t *testing.T) {
@@ -713,6 +779,9 @@ func TestRuntimeConfiguration(t *testing.T) {
 					Routers:     test.routerConfig,
 					Middlewares: test.middlewareConfig,
 				},
+				TLS: &dynamic.TLSConfiguration{
+					Options: test.tlsOptions,
+				},
 			})
 
 			roundTripperManager := service.NewRoundTripperManager(nil)
@@ -720,10 +789,13 @@ func TestRuntimeConfiguration(t *testing.T) {
 			serviceManager := service.NewManager(rtConf.Services, nil, nil, roundTripperManager)
 			middlewaresBuilder := middleware.NewBuilder(rtConf.Middlewares, serviceManager, nil)
 			chainBuilder := middleware.NewChainBuilder(nil, nil, nil)
+			tlsManager := tls.NewManager()
+			tlsManager.UpdateConfigs(context.Background(), nil, test.tlsOptions, nil)
 
-			routerManager := NewManager(rtConf, serviceManager, middlewaresBuilder, chainBuilder, metrics.NewVoidRegistry())
+			routerManager := NewManager(rtConf, serviceManager, middlewaresBuilder, chainBuilder, metrics.NewVoidRegistry(), tlsManager)
 
 			_ = routerManager.BuildHandlers(context.Background(), entryPoints, false)
+			_ = routerManager.BuildHandlers(context.Background(), entryPoints, true)
 
 			// even though rtConf was passed by argument to the manager builders above,
 			// it's ok to use it as the result we check, because everything worth checking
@@ -795,8 +867,9 @@ func TestProviderOnMiddlewares(t *testing.T) {
 	serviceManager := service.NewManager(rtConf.Services, nil, nil, roundTripperManager)
 	middlewaresBuilder := middleware.NewBuilder(rtConf.Middlewares, serviceManager, nil)
 	chainBuilder := middleware.NewChainBuilder(nil, nil, nil)
+	tlsManager := tls.NewManager()
 
-	routerManager := NewManager(rtConf, serviceManager, middlewaresBuilder, chainBuilder, metrics.NewVoidRegistry())
+	routerManager := NewManager(rtConf, serviceManager, middlewaresBuilder, chainBuilder, metrics.NewVoidRegistry(), tlsManager)
 
 	_ = routerManager.BuildHandlers(context.Background(), entryPoints, false)
 
@@ -863,8 +936,9 @@ func BenchmarkRouterServe(b *testing.B) {
 	serviceManager := service.NewManager(rtConf.Services, nil, nil, staticRoundTripperGetter{res})
 	middlewaresBuilder := middleware.NewBuilder(rtConf.Middlewares, serviceManager, nil)
 	chainBuilder := middleware.NewChainBuilder(nil, nil, nil)
+	tlsManager := tls.NewManager()
 
-	routerManager := NewManager(rtConf, serviceManager, middlewaresBuilder, chainBuilder, metrics.NewVoidRegistry())
+	routerManager := NewManager(rtConf, serviceManager, middlewaresBuilder, chainBuilder, metrics.NewVoidRegistry(), tlsManager)
 
 	handlers := routerManager.BuildHandlers(context.Background(), entryPoints, false)
 

pkg/server/router/tcp/manager.go

@@ -105,18 +105,21 @@ func (m *Manager) buildEntryPointHandler(ctx context.Context, configs map[string
 
 	router.SetHTTPHandler(handlerHTTP)
 
+	// Even though the error is seemingly ignored (aside from logging it),
+	// we actually rely later on the fact that a tls config is nil (which happens when an error is returned) to take special steps
+	// when assigning a handler to a route.
 	defaultTLSConf, err := m.tlsManager.Get(traefiktls.DefaultTLSStoreName, traefiktls.DefaultTLSConfigName)
 	if err != nil {
 		log.Ctx(ctx).Error().Err(err).Msg("Error during the build of the default TLS configuration")
 	}
 
-	// Keyed by domain. The source of truth for doing SNI checking, and for what TLS
+	// Keyed by domain. The source of truth for doing SNI checking (domain fronting).
-	// options will actually be used for the connection.
 	// As soon as there's (at least) two different tlsOptions found for the same domain,
 	// we set the value to the default TLS conf.
 	tlsOptionsForHost := map[string]string{}
 
 	// Keyed by domain, then by options reference.
+	// The actual source of truth for what TLS options will actually be used for the connection.
 	// As opposed to tlsOptionsForHost, it keeps track of all the (different) TLS
 	// options that occur for a given host name, so that later on we can set relevant
 	// errors and logging for all the routers concerned (i.e. wrongly configured).
@@ -144,21 +147,20 @@ func (m *Manager) buildEntryPointHandler(ctx context.Context, configs map[string
 		}
 
 		if len(domains) == 0 {
-			// Extra Host(*) rule, for HTTPS routers with no Host rule, and for requests for
+			// Extra Host(*) rule, for HTTPS routers with no Host rule,
-			// which the SNI does not match _any_ of the other existing routers Host. This is
+			// and for requests for which the SNI does not match _any_ of the other existing routers Host.
-			// only about choosing the TLS configuration. The actual routing will be done
+			// This is only about choosing the TLS configuration.
-			// further on by the HTTPS handler. See examples below.
+			// The actual routing will be done further on by the HTTPS handler.
+			// See examples below.
 			router.AddHTTPTLSConfig("*", defaultTLSConf)
 
-			// The server name (from a Host(SNI) rule) is the only parameter (available in
+			// 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,
-			// HTTP routing rules) on which we can map a TLS config, because it is the only one
+			// because it is the only one accessible before decryption (we obtain it during the ClientHello).
-			// accessible before decryption (we obtain it during the ClientHello). Therefore,
+			// Therefore, when a router has no Host rule, it does not make any sense to specify some TLS options.
-			// when a router has no Host rule, it does not make any sense to specify some TLS
+			// Consequently, when it comes to deciding what TLS config will be used,
-			// options. Consequently, when it comes to deciding what TLS config will be used,
+			// for a request that will match an HTTPS router with no Host rule,
-			// for a request that will match an HTTPS router with no Host rule, the result will
+			// the result will depend on the _others_ existing routers (their Host rule, to be precise), and the TLS options associated with them,
-			// depend on the _others_ existing routers (their Host rule, to be precise), and
+			// even though they don't match the incoming request. Consider the following examples:
-			// the TLS options associated with them, even though they don't match the incoming
-			// request. Consider the following examples:
 
 			//	# conf1
 			//	httpRouter1:
@@ -172,17 +174,19 @@ func (m *Manager) buildEntryPointHandler(ctx context.Context, configs map[string
 			//	httpRouter2:
 			//		rule: Host("foo.com") && PathPrefix("/bar")
 			//		tlsoptions: myTLSOptions
-			//	# When a request for "/foo" comes, even though it won't be routed by
+			//	# When a request for "/foo" comes, even though it won't be routed by httpRouter2,
-			//	httpRouter2, if its SNI is set to foo.com, myTLSOptions will be used for the TLS
+			//	# if its SNI is set to foo.com, myTLSOptions will be used for the TLS connection.
-			//	connection. Otherwise, it will fallback to the default TLS config.
+			//	# Otherwise, it will fallback to the default TLS config.
 			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)
 		}
 
-		tlsConf, err := m.tlsManager.Get(traefiktls.DefaultTLSStoreName, tlsOptionsName)
+		// Even though the error is seemingly ignored (aside from logging it),
-		if err != nil {
+		// we actually rely later on the fact that a tls config is nil (which happens when an error is returned) to take special steps
-			routerHTTPConfig.AddError(err, true)
+		// when assigning a handler to a route.
-			logger.Error().Err(err).Send()
+		tlsConf, tlsConfErr := m.tlsManager.Get(traefiktls.DefaultTLSStoreName, tlsOptionsName)
-			continue
+		if tlsConfErr != nil {
+			// Note: we do not call AddError here because we already did so when buildRouterHandler errored for the same reason.
+			logger.Error().Err(tlsConfErr).Send()
 		}
 
 		for _, domain := range domains {
@@ -206,6 +210,7 @@ func (m *Manager) buildEntryPointHandler(ctx context.Context, configs map[string
 
 	sniCheck := snicheck.New(tlsOptionsForHost, handlerHTTPS)
 
+	// Keep in mind that defaultTLSConf might be nil here.
 	router.SetHTTPSHandler(sniCheck, defaultTLSConf)
 
 	logger := log.Ctx(ctx)
@@ -219,10 +224,21 @@ func (m *Manager) buildEntryPointHandler(ctx context.Context, configs map[string
 				break
 			}
 
-			logger.Debug().Msgf("Adding route for %s with TLS options %s", hostSNI, optionsName)
+			if config == nil {
+				// we use nil config as a signal to insert a handler
+				// that enforces that TLS connection attempts to the corresponding (broken) router should fail.
+				logger.Debug().Msgf("Adding special closing route for %s because broken TLS options %s", hostSNI, optionsName)
+				router.AddHTTPTLSConfig(hostSNI, nil)
+				continue
+			}
 
+			logger.Debug().Msgf("Adding route for %s with TLS options %s", hostSNI, optionsName)
 			router.AddHTTPTLSConfig(hostSNI, config)
-		} else {
+			continue
+		}
+
+		// multiple tlsConfigs
+
 		routers := make([]string, 0, len(tlsConfigs))
 		for _, v := range tlsConfigs {
 			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)
@@ -230,11 +246,20 @@ func (m *Manager) buildEntryPointHandler(ctx context.Context, configs map[string
 		}
 
 		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)
+		if defaultTLSConf == nil {
+			logger.Debug().Msgf("Adding special closing route for %s because broken default TLS options", hostSNI)
+		}
 
 		router.AddHTTPTLSConfig(hostSNI, defaultTLSConf)
 	}
-	}
 
+	m.addTCPHandlers(ctx, configs, router)
+
+	return router, nil
+}
+
+// addTCPHandlers creates the TCP handlers defined in configs, and adds them to router.
+func (m *Manager) addTCPHandlers(ctx context.Context, configs map[string]*runtime.TCPRouterInfo, router *Router) {
 	for routerName, routerConfig := range configs {
 		logger := log.Ctx(ctx).With().Str(logs.RouterName, routerName).Logger()
 		ctxRouter := logger.WithContext(provider.AddInContext(ctx, routerName))
@@ -253,13 +278,6 @@ func (m *Manager) buildEntryPointHandler(ctx context.Context, configs map[string
 			continue
 		}
 
-		handler, err := m.buildTCPHandler(ctxRouter, routerConfig)
-		if err != nil {
-			routerConfig.AddError(err, true)
-			logger.Error().Err(err).Send()
-			continue
-		}
-
 		domains, err := tcpmuxer.ParseHostSNI(routerConfig.Rule)
 		if err != nil {
 			routerErr := fmt.Errorf("invalid rule: %q , %w", routerConfig.Rule, err)
@@ -276,6 +294,16 @@ func (m *Manager) buildEntryPointHandler(ctx context.Context, configs map[string
 			logger.Error().Err(routerErr).Send()
 		}
 
+		var handler tcp.Handler
+		if routerConfig.TLS == nil || routerConfig.TLS.Passthrough {
+			handler, err = m.buildTCPHandler(ctxRouter, routerConfig)
+			if err != nil {
+				routerConfig.AddError(err, true)
+				logger.Error().Err(err).Send()
+				continue
+			}
+		}
+
 		if routerConfig.TLS == nil {
 			logger.Debug().Msgf("Adding route for %q", routerConfig.Rule)
 			if err := router.AddRoute(routerConfig.Rule, routerConfig.Priority, handler); err != nil {
@@ -287,7 +315,7 @@ func (m *Manager) buildEntryPointHandler(ctx context.Context, configs map[string
 
 		if routerConfig.TLS.Passthrough {
 			logger.Debug().Msgf("Adding Passthrough route for %q", routerConfig.Rule)
-			if err := router.AddRouteTLS(routerConfig.Rule, routerConfig.Priority, handler, nil); err != nil {
+			if err := router.muxerTCPTLS.AddRoute(routerConfig.Rule, routerConfig.Priority, handler); err != nil {
 				routerConfig.AddError(err, true)
 				logger.Error().Err(err).Send()
 			}
@@ -318,6 +346,14 @@ func (m *Manager) buildEntryPointHandler(ctx context.Context, configs map[string
 		if err != nil {
 			routerConfig.AddError(err, true)
 			logger.Error().Err(err).Send()
+
+			logger.Debug().Msgf("Adding special TLS closing route for %q because broken TLS options %s", routerConfig.Rule, tlsOptionsName)
+
+			err = router.muxerTCPTLS.AddRoute(routerConfig.Rule, routerConfig.Priority, &brokenTLSRouter{})
+			if err != nil {
+				routerConfig.AddError(err, true)
+				logger.Error().Err(err).Send()
+			}
 			continue
 		}
 
@@ -329,20 +365,30 @@ func (m *Manager) buildEntryPointHandler(ctx context.Context, configs map[string
 		//		rule: HostSNI(foo.com) && ClientIP(IP2)
 		//		tlsOption: tlsTwo
 		// i.e. same HostSNI but different tlsOptions
-		// This is only applicable if the muxer can decide about the routing _before_
+		// 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).
-		// telling the client about the tlsConf (i.e. before the TLS HandShake). This seems
+		// This seems to be the case so far with the existing matchers (HostSNI, and ClientIP), so it's all good.
-		// to be the case so far with the existing matchers (HostSNI, and ClientIP), so
+		// Otherwise, we would have to do as for HTTPS, i.e. disallow different TLS configs for the same HostSNIs.
-		// it's all good. Otherwise, we would have to do as for HTTPS, i.e. disallow
+
-		// different TLS configs for the same HostSNIs.
+		handler, err = m.buildTCPHandler(ctxRouter, routerConfig)
+		if err != nil {
+			routerConfig.AddError(err, true)
+			logger.Error().Err(err).Send()
+			continue
+		}
+
+		handler = &tcp.TLSHandler{
+			Next:   handler,
+			Config: tlsConf,
+		}
 
 		logger.Debug().Msgf("Adding TLS route for %q", routerConfig.Rule)
-		if err := router.AddRouteTLS(routerConfig.Rule, routerConfig.Priority, handler, tlsConf); err != nil {
+
+		err = router.muxerTCPTLS.AddRoute(routerConfig.Rule, routerConfig.Priority, handler)
+		if err != nil {
 			routerConfig.AddError(err, true)
 			logger.Error().Err(err).Send()
 		}
 	}
-
-	return router, nil
 }
 
 func (m *Manager) buildTCPHandler(ctx context.Context, router *runtime.TCPRouterInfo) (tcp.Handler, error) {

pkg/server/router/tcp/router.go

@@ -27,19 +27,20 @@ type Router struct {
 	muxerHTTPS tcpmuxer.Muxer
 
 	// Forwarder handlers.
-	// Handles all HTTP requests.
+	// httpForwarder handles all HTTP requests.
 	httpForwarder tcp.Handler
-	// Handles (indirectly through muxerHTTPS, or directly) all HTTPS requests.
+	// httpsForwarder handles (indirectly through muxerHTTPS, or directly) all HTTPS requests.
 	httpsForwarder tcp.Handler
 
-	// Neither is used directly, but they are held here, and recreated on config
+	// Neither is used directly, but they are held here, and recreated on config reload,
-	// reload, so that they can be passed to the Switcher at the end of the config
+	// so that they can be passed to the Switcher at the end of the config reload phase.
-	// reload phase.
 	httpHandler  http.Handler
 	httpsHandler http.Handler
 
 	// TLS configs.
 	httpsTLSConfig *tls.Config // default TLS config
+	// hostHTTPTLSConfig contains TLS configs keyed by SNI.
+	// A nil config is the hint to set up a brokenTLSRouter.
 	hostHTTPTLSConfig map[string]*tls.Config // TLS configs keyed by SNI
 }
 
@@ -80,11 +81,11 @@ func (r *Router) GetTLSGetClientInfo() func(info *tls.ClientHelloInfo) (*tls.Con
 
 // ServeTCP forwards the connection to the right TCP/HTTP handler.
 func (r *Router) ServeTCP(conn tcp.WriteCloser) {
-	// Handling Non-TLS TCP connection early if there is neither HTTP(S) nor TLS
+	// Handling Non-TLS TCP connection early if there is neither HTTP(S) nor TLS routers on the entryPoint,
-	// routers on the entryPoint, and if there is at least one non-TLS TCP router.
+	// and if there is at least one non-TLS TCP router.
-	// In the case of a non-TLS TCP client (that does not "send" first), we would
+	// In the case of a non-TLS TCP client (that does not "send" first),
-	// block forever on clientHelloInfo, which is why we want to detect and
+	// we would block forever on clientHelloInfo,
-	// handle that case first and foremost.
+	// which is why we want to detect and handle that case first and foremost.
 	if r.muxerTCP.HasRoutes() && !r.muxerTCPTLS.HasRoutes() && !r.muxerHTTPS.HasRoutes() {
 		connData, err := tcpmuxer.NewConnData("", conn, nil)
 		if err != nil {
@@ -163,9 +164,9 @@ func (r *Router) ServeTCP(conn tcp.WriteCloser) {
 	// (wrapped inside the returned handler) requested for the given HostSNI.
 	handlerHTTPS, catchAllHTTPS := r.muxerHTTPS.Match(connData)
 	if handlerHTTPS != nil && !catchAllHTTPS {
-		// In order not to depart from the behavior in 2.6, we only allow an HTTPS router
+		// In order not to depart from the behavior in 2.6,
-		// to take precedence over a TCP-TLS router if it is _not_ an HostSNI(*) router (so
+		// we only allow an HTTPS router to take precedence over a TCP-TLS router if it is _not_ an HostSNI(*) router
-		// basically any router that has a specific HostSNI based rule).
+		// (so basically any router that has a specific HostSNI based rule).
 		handlerHTTPS.ServeTCP(r.GetConn(conn, hello.peeked))
 		return
 	}
@@ -191,7 +192,7 @@ func (r *Router) ServeTCP(conn tcp.WriteCloser) {
 		return
 	}
 
-	// needed to handle 404s for HTTPS, as well as all non-Host (e.g. PathPrefix) matches.
+	// To handle 404s for HTTPS.
 	if r.httpsForwarder != nil {
 		r.httpsForwarder.ServeTCP(r.GetConn(conn, hello.peeked))
 		return
@@ -205,19 +206,6 @@ func (r *Router) AddRoute(rule string, priority int, target tcp.Handler) error {
 	return r.muxerTCP.AddRoute(rule, priority, target)
 }
 
-// AddRouteTLS defines a handler for a given rule and sets the matching tlsConfig.
-func (r *Router) AddRouteTLS(rule string, priority int, target tcp.Handler, config *tls.Config) error {
-	// TLS PassThrough
-	if config == nil {
-		return r.muxerTCPTLS.AddRoute(rule, priority, target)
-	}
-
-	return r.muxerTCPTLS.AddRoute(rule, priority, &tcp.TLSHandler{
-		Next:   target,
-		Config: config,
-	})
-}
-
 // AddHTTPTLSConfig defines a handler for a given sniHost and sets the matching tlsConfig.
 func (r *Router) AddHTTPTLSConfig(sniHost string, config *tls.Config) {
 	if r.hostHTTPTLSConfig == nil {
@@ -253,20 +241,44 @@ func (r *Router) SetHTTPForwarder(handler tcp.Handler) {
 	r.httpForwarder = handler
 }
 
-// SetHTTPSForwarder sets the tcp handler that will forward the TLS connections to an http handler.
+// brokenTLSRouter is associated to a Host(SNI) rule for which we know the TLS conf is broken.
+// It is used to make sure any attempt to connect to that hostname is closed,
+// since we cannot proceed with the intended TLS conf.
+type brokenTLSRouter struct{}
+
+// ServeTCP instantly closes the connection.
+func (t *brokenTLSRouter) ServeTCP(conn tcp.WriteCloser) {
+	_ = conn.Close()
+}
+
+// SetHTTPSForwarder sets the tcp handler that will forward the TLS connections to an HTTP handler.
+// It also sets up each TLS handler (with its TLS config) for each Host(SNI) rule we previously kept track of.
+// It sets up a special handler that closes the connection if a TLS config is nil.
 func (r *Router) SetHTTPSForwarder(handler tcp.Handler) {
 	for sniHost, tlsConf := range r.hostHTTPTLSConfig {
-		// muxerHTTPS only contains single HostSNI rules (and no other kind of rules),
+		var tcpHandler tcp.Handler
-		// so there's no need for specifying a priority for them.
+		if tlsConf == nil {
-		err := r.muxerHTTPS.AddRoute("HostSNI(`"+sniHost+"`)", 0, &tcp.TLSHandler{
+			tcpHandler = &brokenTLSRouter{}
+		} else {
+			tcpHandler = &tcp.TLSHandler{
 				Next:   handler,
 				Config: tlsConf,
-		})
+			}
+		}
+
+		// muxerHTTPS only contains single HostSNI rules (and no other kind of rules),
+		// so there's no need for specifying a priority for them.
+		err := r.muxerHTTPS.AddRoute("HostSNI(`"+sniHost+"`)", 0, tcpHandler)
 		if err != nil {
 			log.Error().Err(err).Msg("Error while adding route for host")
 		}
 	}
 
+	if r.httpsTLSConfig == nil {
+		r.httpsForwarder = &brokenTLSRouter{}
+		return
+	}
+
 	r.httpsForwarder = &tcp.TLSHandler{
 		Next:   handler,
 		Config: r.httpsTLSConfig,
@@ -286,15 +298,14 @@ func (r *Router) SetHTTPSHandler(handler http.Handler, config *tls.Config) {
 
 // Conn is a connection proxy that handles Peeked bytes.
 type Conn struct {
-	// Peeked are the bytes that have been read from Conn for the
+	// Peeked are the bytes that have been read from Conn for the purposes of route matching,
-	// purposes of route matching, but have not yet been consumed
+	// but have not yet been consumed by Read calls.
-	// by Read calls. It is set to nil by Read when fully consumed.
+	// It set to nil by Read when fully consumed.
 	Peeked []byte
 
 	// Conn is the underlying connection.
-	// It can be type asserted against *net.TCPConn or other types
+	// It can be type asserted against *net.TCPConn or other types as needed.
-	// as needed. It should not be read from directly unless
+	// It should not be read from directly unless Peeked is nil.
-	// Peeked is nil.
 	tcp.WriteCloser
 }
 
@@ -331,15 +342,14 @@ func clientHelloInfo(br *bufio.Reader) (*clientHello, error) {
 		return nil, err
 	}
 
-	// No valid TLS record has a type of 0x80, however SSLv2 handshakes
+	// No valid TLS record has a type of 0x80, however SSLv2 handshakes start with an uint16 length
-	// start with a uint16 length where the MSB is set and the first record
+	// where the MSB is set and the first record is always < 256 bytes long.
-	// is always < 256 bytes long. Therefore typ == 0x80 strongly suggests
+	// Therefore, typ == 0x80 strongly suggests an SSLv2 client.
-	// an SSLv2 client.
 	const recordTypeSSLv2 = 0x80
 	const recordTypeHandshake = 0x16
 	if hdr[0] != recordTypeHandshake {
 		if hdr[0] == recordTypeSSLv2 {
-			// we consider SSLv2 as TLS and it will be refused by real TLS handshake.
+			// we consider SSLv2 as TLS, and it will be refused by real TLS handshake.
 			return &clientHello{
 				isTLS:  true,
 				peeked: getPeeked(br),

pkg/server/router/tcp/router_test.go

@@ -930,7 +930,7 @@ func TestPostgres(t *testing.T) {
 	// This test requires to have a TLS route, but does not actually check the
 	// content of the handler. It would require to code a TLS handshake to
 	// check the SNI and content of the handlerFunc.
-	err = router.AddRouteTLS("HostSNI(`test.localhost`)", 0, nil, &tls.Config{})
+	err = router.muxerTCPTLS.AddRoute("HostSNI(`test.localhost`)", 0, nil)
 	require.NoError(t, err)
 
 	err = router.AddRoute("HostSNI(`*`)", 0, tcp2.HandlerFunc(func(conn tcp2.WriteCloser) {

pkg/server/routerfactory.go

@@ -79,7 +79,7 @@ func (f *RouterFactory) CreateRouters(rtConf *runtime.Configuration) (map[string
 
 	middlewaresBuilder := middleware.NewBuilder(rtConf.Middlewares, serviceManager, f.pluginBuilder)
 
-	routerManager := router.NewManager(rtConf, serviceManager, middlewaresBuilder, f.chainBuilder, f.metricsRegistry)
+	routerManager := router.NewManager(rtConf, serviceManager, middlewaresBuilder, f.chainBuilder, f.metricsRegistry, f.tlsManager)
 
 	handlersNonTLS := routerManager.BuildHandlers(ctx, f.entryPointsTCP, false)
 	handlersTLS := routerManager.BuildHandlers(ctx, f.entryPointsTCP, true)

pkg/tls/tlsmanager.go

@@ -158,19 +158,16 @@ func (m *Manager) Get(storeName, configName string) (*tls.Config, error) {
 	m.lock.RLock()
 	defer m.lock.RUnlock()
 
-	var tlsConfig *tls.Config
-	var err error
-
 	sniStrict := false
 	config, ok := m.configs[configName]
-	if ok {
+	if !ok {
-		sniStrict = config.SniStrict
+		return nil, fmt.Errorf("unknown TLS options: %s", configName)
-		tlsConfig, err = buildTLSConfig(config)
-	} else {
-		err = fmt.Errorf("unknown TLS options: %s", configName)
 	}
+
+	sniStrict = config.SniStrict
+	tlsConfig, err := buildTLSConfig(config)
 	if err != nil {
-		tlsConfig = &tls.Config{}
+		return nil, fmt.Errorf("building TLS config: %w", err)
 	}
 
 	store := m.getStore(storeName)
@@ -178,7 +175,7 @@ func (m *Manager) Get(storeName, configName string) (*tls.Config, error) {
 		err = fmt.Errorf("TLS store %s not found", storeName)
 	}
 	acmeTLSStore := m.getStore(tlsalpn01.ACMETLS1Protocol)
-	if acmeTLSStore == nil {
+	if acmeTLSStore == nil && err == nil {
 		err = fmt.Errorf("ACME TLS store %s not found", tlsalpn01.ACMETLS1Protocol)
 	}
 
@@ -189,15 +186,12 @@ func (m *Manager) Get(storeName, configName string) (*tls.Config, error) {
 			certificate := acmeTLSStore.GetBestCertificate(clientHello)
 			if certificate == nil {
 				log.Debug().Msgf("TLS: no certificate for TLSALPN challenge: %s", domainToCheck)
-				// We want the user to eventually get the (alertUnrecognizedName) "unrecognized
+				// We want the user to eventually get the (alertUnrecognizedName) "unrecognized name" error.
-				// name" error.
+				// Unfortunately, if we returned an error here,
-				// Unfortunately, if we returned an error here, since we can't use
+				// since we can't use the unexported error (errNoCertificates) that our caller (config.getCertificate in crypto/tls) uses as a sentinel,
-				// the unexported error (errNoCertificates) that our caller (config.getCertificate
+				// it would report an (alertInternalError) "internal error" instead of an alertUnrecognizedName.
-				// in crypto/tls) uses as a sentinel, it would report an (alertInternalError)
+				// Which is why we return no error, and we let the caller detect that there's actually no certificate,
-				// "internal error" instead of an alertUnrecognizedName.
+				// and fall back into the flow that will report the desired error.
-				// Which is why we return no error, and we let the caller detect that there's
-				// actually no certificate, and fall back into the flow that will report
-				// the desired error.
 				// https://cs.opensource.google/go/go/+/dev.boringcrypto.go1.17:src/crypto/tls/common.go;l=1058
 				return nil, nil
 			}

pkg/tls/tlsmanager_test.go

@@ -121,6 +121,7 @@ func TestManager_Get(t *testing.T) {
 	tlsConfigs := map[string]Options{
 		"foo":     {MinVersion: "VersionTLS12"},
 		"bar":     {MinVersion: "VersionTLS11"},
+		"invalid": {CurvePreferences: []string{"42"}},
 	}
 
 	testCases := []struct {
@@ -140,15 +141,20 @@ func TestManager_Get(t *testing.T) {
 			expectedMinVersion: uint16(tls.VersionTLS11),
 		},
 		{
-			desc:           "Get an tls config from an invalid name",
+			desc:           "Get a tls config from an invalid name",
 			tlsOptionsName: "unknown",
 			expectedError:  true,
 		},
 		{
-			desc:           "Get an tls config from unexisting 'default' name",
+			desc:           "Get a tls config from unexisting 'default' name",
 			tlsOptionsName: "default",
 			expectedError:  true,
 		},
+		{
+			desc:           "Get an invalid tls config",
+			tlsOptionsName: "invalid",
+			expectedError:  true,
+		},
 	}
 
 	tlsManager := NewManager()
@@ -161,42 +167,13 @@ func TestManager_Get(t *testing.T) {
 
 			config, err := tlsManager.Get("default", test.tlsOptionsName)
 			if test.expectedError {
-				assert.Error(t, err)
+				require.Nil(t, config)
+				require.Error(t, err)
 				return
 			}
 
-			assert.NoError(t, err)
-			assert.Equal(t, config.MinVersion, test.expectedMinVersion)
-		})
-	}
-}
-
-func TestManager_Get_GetCertificate(t *testing.T) {
-	testCases := []struct {
-		desc                 string
-		expectedGetConfigErr require.ErrorAssertionFunc
-		expectedCertificate  assert.ValueAssertionFunc
-	}{
-		{
-			desc:                 "Get a default certificate from non-existing store",
-			expectedGetConfigErr: require.Error,
-			expectedCertificate:  assert.Nil,
-		},
-	}
-
-	tlsManager := NewManager()
-
-	for _, test := range testCases {
-		test := test
-		t.Run(test.desc, func(t *testing.T) {
-			t.Parallel()
-
-			config, err := tlsManager.Get("default", "foo")
-			test.expectedGetConfigErr(t, err)
-
-			certificate, err := config.GetCertificate(&tls.ClientHelloInfo{})
 			require.NoError(t, err)
-			test.expectedCertificate(t, certificate)
+			assert.Equal(t, config.MinVersion, test.expectedMinVersion)
 		})
 	}
 }

script/gcg/traefik-bugfix.toml

@@ -4,11 +4,11 @@ RepositoryName = "traefik"
 OutputType = "file"
 FileName = "traefik_changelog.md"
 
-# example new bugfix v2.9.5
+# example new bugfix v2.9.6
 CurrentRef = "v2.9"
-PreviousRef = "v2.9.4"
+PreviousRef = "v2.9.5"
 BaseBranch = "v2.9"
-FutureCurrentRefName = "v2.9.5"
+FutureCurrentRefName = "v2.9.6"
 
 ThresholdPreviousRef = 10
 ThresholdCurrentRef = 10