Prepare release 2.2.7

Co-authored-by: Ludovic Fernandez <ldez@users.noreply.github.com>

CHANGELOG.md

@@ -1,3 +1,21 @@
+## [v2.2.7](https://github.com/containous/traefik/tree/v2.2.7) (2020-07-20)
+[All Commits](https://github.com/containous/traefik/compare/v2.2.6...v2.2.7)
+
+**Bug fixes:**
+- **[server,tls]** fix: drop host port to compare with SNI. ([#7071](https://github.com/containous/traefik/pull/7071) by [ldez](https://github.com/ldez))
+
+## [v2.2.6](https://github.com/containous/traefik/tree/v2.2.6) (2020-07-17)
+[All Commits](https://github.com/containous/traefik/compare/v2.2.5...v2.2.6)
+
+**Bug fixes:**
+- **[logs]** fix: access logs header names filtering is case insensitive ([#6900](https://github.com/containous/traefik/pull/6900) by [mjeanroy](https://github.com/mjeanroy))
+- **[provider]** Get Entrypoints Port Address without protocol for redirect ([#7047](https://github.com/containous/traefik/pull/7047) by [SantoDE](https://github.com/SantoDE))
+- **[tls]** Fix domain fronting ([#7064](https://github.com/containous/traefik/pull/7064) by [juliens](https://github.com/juliens))
+
+**Documentation:**
+- fix: documentation references. ([#7049](https://github.com/containous/traefik/pull/7049) by [ldez](https://github.com/ldez))
+- Add example for entrypoint on one ip address ([#6483](https://github.com/containous/traefik/pull/6483) by [SimonHeimberg](https://github.com/SimonHeimberg))
+
 ## [v2.2.5](https://github.com/containous/traefik/tree/v2.2.5) (2020-07-13)
 [All Commits](https://github.com/containous/traefik/compare/v2.2.4...v2.2.5)
 

docs/content/routing/entrypoints.md

@@ -168,7 +168,7 @@ The format is:
 
 If both TCP and UDP are wanted for the same port, two entryPoints definitions are needed, such as in the example below.
 
-??? example "Both TCP and UDP on port 3179"
+??? example "Both TCP and UDP on Port 3179"
 
     ```toml tab="File (TOML)"
     ## Static configuration
@@ -194,6 +194,30 @@ If both TCP and UDP are wanted for the same port, two entryPoints definitions ar
     --entryPoints.udpep.address=:3179/udp
     ```
 
+??? example "Listen on Specific IP Addresses Only"
+
+    ```toml tab="File (TOML)"
+    [entryPoints.specificIPv4]
+      address = "192.168.2.7:8888"
+    [entryPoints.specificIPv6]
+      address = "[2001:db8::1]:8888"
+    ```
+    
+    ```yaml tab="File (yaml)"
+    entryPoints:
+      specificIPv4:
+        address: "192.168.2.7:8888"
+      specificIPv6:
+        address: "[2001:db8::1]:8888"
+    ```
+    
+    ```bash tab="CLI"
+    entrypoints.specificIPv4.address=192.168.2.7:8888
+    entrypoints.specificIPv6.address=[2001:db8::1]:8888
+    ```
+    
+    Full details for how to specify `address` can be found in [net.Listen](https://golang.org/pkg/net/#Listen) (and [net.Dial](https://golang.org/pkg/net/#Dial)) of the doc for go.
+
 ### Forwarded Headers
 
 You can configure Traefik to trust the forwarded headers information (`X-Forwarded-*`).

docs/content/routing/routers/index.md

@@ -472,6 +472,11 @@ It refers to a [TLS Options](../../https/tls.md#tls-options) and will be applied
     the TLS option is picked from the mapping mentioned above and based on the server name provided during the TLS handshake,
     and it all happens before routing actually occurs.
 
+!!! info "Domain Fronting"
+
+    In the case of domain fronting,
+    if the TLS options associated with the Host Header and the SNI are different then Traefik will respond with a status code `421`.
+
 ??? example "Configuring the TLS options"
 
     ```toml tab="File (TOML)"

integration/acme_test.go

@@ -444,7 +444,7 @@ func (s *AcmeSuite) retrieveAcmeCertificate(c *check.C, testCase acmeTestCase) {
 	// A real file is needed to have the right mode on acme.json file
 	defer os.Remove("/tmp/acme.json")
 
-	backend := startTestServer("9010", http.StatusOK)
+	backend := startTestServer("9010", http.StatusOK, "")
 	defer backend.Close()
 
 	for _, sub := range testCase.subCases {

integration/fixtures/https/https_domain_fronting.toml

@@ -0,0 +1,53 @@
+[global]
+  checkNewVersion = false
+  sendAnonymousUsage = false
+
+[log]
+  level = "DEBUG"
+
+[entryPoints.websecure]
+  address = ":4443"
+
+[api]
+  insecure = true
+
+[providers.file]
+  filename = "{{ .SelfFilename }}"
+
+## dynamic configuration ##
+
+[http.routers.router1]
+  rule = "Host(`site1.www.snitest.com`)"
+  service = "service1"
+  [http.routers.router1.tls]
+
+[http.routers.router2]
+  rule = "Host(`site2.www.snitest.com`)"
+  service = "service2"
+  [http.routers.router2.tls]
+
+[http.routers.router3]
+  rule = "Host(`site3.www.snitest.com`)"
+  service = "service3"
+  [http.routers.router3.tls]
+    options = "mytls"
+
+[http.services.service1]
+  [[http.services.service1.loadBalancer.servers]]
+    url = "http://127.0.0.1:9010"
+
+[http.services.service2]
+  [[http.services.service2.loadBalancer.servers]]
+    url = "http://127.0.0.1:9020"
+
+[http.services.service3]
+  [[http.services.service3.loadBalancer.servers]]
+    url = "http://127.0.0.1:9030"
+
+[[tls.certificates]]
+  certFile = "fixtures/https/wildcard.www.snitest.com.cert"
+  keyFile = "fixtures/https/wildcard.www.snitest.com.key"
+
+[tls.options]
+  [tls.options.mytls]
+    maxVersion = "VersionTLS12"

integration/headers_test.go

@@ -35,7 +35,7 @@ func (s *HeadersSuite) TestCorsResponses(c *check.C) {
 	c.Assert(err, checker.IsNil)
 	defer cmd.Process.Kill()
 
-	backend := startTestServer("9000", http.StatusOK)
+	backend := startTestServer("9000", http.StatusOK, "")
 	defer backend.Close()
 
 	err = try.GetRequest(backend.URL, 500*time.Millisecond, try.StatusCodeIs(http.StatusOK))
@@ -124,7 +124,7 @@ func (s *HeadersSuite) TestSecureHeadersResponses(c *check.C) {
 	c.Assert(err, checker.IsNil)
 	defer cmd.Process.Kill()
 
-	backend := startTestServer("9000", http.StatusOK)
+	backend := startTestServer("9000", http.StatusOK, "")
 	defer backend.Close()
 
 	err = try.GetRequest(backend.URL, 500*time.Millisecond, try.StatusCodeIs(http.StatusOK))

integration/helloworld/helloworld.pb.go

@@ -16,9 +16,10 @@ It has these top-level messages:
 package helloworld
 
 import (
-	proto "github.com/golang/protobuf/proto"
 	fmt "fmt"
 	math "math"
+
+	proto "github.com/golang/protobuf/proto"
 )
 
 import (

integration/https_test.go

@@ -73,8 +73,8 @@ func (s *HTTPSSuite) TestWithSNIConfigRoute(c *check.C) {
 	err = try.GetRequest("http://127.0.0.1:8080/api/rawdata", 1*time.Second, try.BodyContains("Host(`snitest.org`)"))
 	c.Assert(err, checker.IsNil)
 
-	backend1 := startTestServer("9010", http.StatusNoContent)
-	backend2 := startTestServer("9020", http.StatusResetContent)
+	backend1 := startTestServer("9010", http.StatusNoContent, "")
+	backend2 := startTestServer("9020", http.StatusResetContent, "")
 	defer backend1.Close()
 	defer backend2.Close()
 
@@ -129,8 +129,8 @@ func (s *HTTPSSuite) TestWithTLSOptions(c *check.C) {
 	err = try.GetRequest("http://127.0.0.1:8080/api/rawdata", 1*time.Second, try.BodyContains("Host(`snitest.org`)"))
 	c.Assert(err, checker.IsNil)
 
-	backend1 := startTestServer("9010", http.StatusNoContent)
-	backend2 := startTestServer("9020", http.StatusResetContent)
+	backend1 := startTestServer("9010", http.StatusNoContent, "")
+	backend2 := startTestServer("9020", http.StatusResetContent, "")
 	defer backend1.Close()
 	defer backend2.Close()
 
@@ -215,8 +215,8 @@ func (s *HTTPSSuite) TestWithConflictingTLSOptions(c *check.C) {
 	err = try.GetRequest("http://127.0.0.1:8080/api/rawdata", 1*time.Second, try.BodyContains("Host(`snitest.net`)"))
 	c.Assert(err, checker.IsNil)
 
-	backend1 := startTestServer("9010", http.StatusNoContent)
-	backend2 := startTestServer("9020", http.StatusResetContent)
+	backend1 := startTestServer("9010", http.StatusNoContent, "")
+	backend2 := startTestServer("9020", http.StatusResetContent, "")
 	defer backend1.Close()
 	defer backend2.Close()
 
@@ -733,9 +733,12 @@ func (s *HTTPSSuite) TestWithRootCAsFileForHTTPSOnBackend(c *check.C) {
 	c.Assert(err, checker.IsNil)
 }
 
-func startTestServer(port string, statusCode int) (ts *httptest.Server) {
+func startTestServer(port string, statusCode int, textContent string) (ts *httptest.Server) {
 	handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		w.WriteHeader(statusCode)
+		if textContent != "" {
+			_, _ = w.Write([]byte(textContent))
+		}
 	})
 	listener, err := net.Listen("tcp", "127.0.0.1:"+port)
 	if err != nil {
@@ -787,8 +790,8 @@ func (s *HTTPSSuite) TestWithSNIDynamicConfigRouteWithNoChange(c *check.C) {
 	err = try.GetRequest("http://127.0.0.1:8080/api/rawdata", 1*time.Second, try.BodyContains("Host(`"+tr1.TLSClientConfig.ServerName+"`)"))
 	c.Assert(err, checker.IsNil)
 
-	backend1 := startTestServer("9010", http.StatusNoContent)
-	backend2 := startTestServer("9020", http.StatusResetContent)
+	backend1 := startTestServer("9010", http.StatusNoContent, "")
+	backend2 := startTestServer("9020", http.StatusResetContent, "")
 	defer backend1.Close()
 	defer backend2.Close()
 
@@ -856,8 +859,8 @@ func (s *HTTPSSuite) TestWithSNIDynamicConfigRouteWithChange(c *check.C) {
 	err = try.GetRequest("http://127.0.0.1:8080/api/rawdata", 1*time.Second, try.BodyContains("Host(`"+tr2.TLSClientConfig.ServerName+"`)"))
 	c.Assert(err, checker.IsNil)
 
-	backend1 := startTestServer("9010", http.StatusNoContent)
-	backend2 := startTestServer("9020", http.StatusResetContent)
+	backend1 := startTestServer("9010", http.StatusNoContent, "")
+	backend2 := startTestServer("9020", http.StatusResetContent, "")
 	defer backend1.Close()
 	defer backend2.Close()
 
@@ -919,7 +922,7 @@ func (s *HTTPSSuite) TestWithSNIDynamicConfigRouteWithTlsConfigurationDeletion(c
 	err = try.GetRequest("http://127.0.0.1:8080/api/rawdata", 1*time.Second, try.BodyContains("Host(`"+tr2.TLSClientConfig.ServerName+"`)"))
 	c.Assert(err, checker.IsNil)
 
-	backend2 := startTestServer("9020", http.StatusResetContent)
+	backend2 := startTestServer("9020", http.StatusResetContent, "")
 
 	defer backend2.Close()
 
@@ -1111,3 +1114,115 @@ func (s *HTTPSSuite) TestWithSNIDynamicCaseInsensitive(c *check.C) {
 	proto := conn.ConnectionState().NegotiatedProtocol
 	c.Assert(proto, checker.Equals, "h2")
 }
+
+// TestWithDomainFronting verify the domain fronting behavior
+func (s *HTTPSSuite) TestWithDomainFronting(c *check.C) {
+	backend := startTestServer("9010", http.StatusOK, "server1")
+	defer backend.Close()
+	backend2 := startTestServer("9020", http.StatusOK, "server2")
+	defer backend2.Close()
+	backend3 := startTestServer("9030", http.StatusOK, "server3")
+	defer backend3.Close()
+
+	file := s.adaptFile(c, "fixtures/https/https_domain_fronting.toml", struct{}{})
+	defer os.Remove(file)
+	cmd, display := s.traefikCmd(withConfigFile(file))
+	defer display(c)
+	err := cmd.Start()
+	c.Assert(err, checker.IsNil)
+	defer cmd.Process.Kill()
+
+	// wait for Traefik
+	err = try.GetRequest("http://127.0.0.1:8080/api/rawdata", 500*time.Millisecond, try.BodyContains("Host(`site1.www.snitest.com`)"))
+	c.Assert(err, checker.IsNil)
+
+	testCases := []struct {
+		desc               string
+		hostHeader         string
+		serverName         string
+		expectedContent    string
+		expectedStatusCode int
+	}{
+		{
+			desc:               "SimpleCase",
+			hostHeader:         "site1.www.snitest.com",
+			serverName:         "site1.www.snitest.com",
+			expectedContent:    "server1",
+			expectedStatusCode: http.StatusOK,
+		},
+		{
+			desc:               "Simple case with port in the Host Header",
+			hostHeader:         "site3.www.snitest.com:4443",
+			serverName:         "site3.www.snitest.com",
+			expectedContent:    "server3",
+			expectedStatusCode: http.StatusOK,
+		},
+		{
+			desc:               "Spaces after the host header",
+			hostHeader:         "site3.www.snitest.com ",
+			serverName:         "site3.www.snitest.com",
+			expectedContent:    "server3",
+			expectedStatusCode: http.StatusOK,
+		},
+		{
+			desc:               "Spaces after the servername",
+			hostHeader:         "site3.www.snitest.com",
+			serverName:         "site3.www.snitest.com ",
+			expectedContent:    "server3",
+			expectedStatusCode: http.StatusOK,
+		},
+		{
+			desc:               "Spaces after the servername and host header",
+			hostHeader:         "site3.www.snitest.com ",
+			serverName:         "site3.www.snitest.com ",
+			expectedContent:    "server3",
+			expectedStatusCode: http.StatusOK,
+		},
+		{
+			desc:               "Domain Fronting with same tlsOptions should follow header",
+			hostHeader:         "site1.www.snitest.com",
+			serverName:         "site2.www.snitest.com",
+			expectedContent:    "server1",
+			expectedStatusCode: http.StatusOK,
+		},
+		{
+			desc:               "Domain Fronting with same tlsOptions should follow header (2)",
+			hostHeader:         "site2.www.snitest.com",
+			serverName:         "site1.www.snitest.com",
+			expectedContent:    "server2",
+			expectedStatusCode: http.StatusOK,
+		},
+		{
+			desc:               "Domain Fronting with different tlsOptions should produce a 421",
+			hostHeader:         "site2.www.snitest.com",
+			serverName:         "site3.www.snitest.com",
+			expectedContent:    "",
+			expectedStatusCode: http.StatusMisdirectedRequest,
+		},
+		{
+			desc:               "Domain Fronting with different tlsOptions should produce a 421 (2)",
+			hostHeader:         "site3.www.snitest.com",
+			serverName:         "site1.www.snitest.com",
+			expectedContent:    "",
+			expectedStatusCode: http.StatusMisdirectedRequest,
+		},
+		{
+			desc:               "Case insensitive",
+			hostHeader:         "sIte1.www.snitest.com",
+			serverName:         "sitE1.www.snitest.com",
+			expectedContent:    "server1",
+			expectedStatusCode: http.StatusOK,
+		},
+	}
+
+	for _, test := range testCases {
+		test := test
+
+		req, err := http.NewRequest(http.MethodGet, "https://127.0.0.1:4443", nil)
+		c.Assert(err, checker.IsNil)
+		req.Host = test.hostHeader
+
+		err = try.RequestWithTransport(req, 500*time.Millisecond, &http.Transport{TLSClientConfig: &tls.Config{InsecureSkipVerify: true, ServerName: test.serverName}}, try.StatusCodeIs(test.expectedStatusCode), try.BodyContains(test.expectedContent))
+		c.Assert(err, checker.IsNil)
+	}
+}

pkg/middlewares/accesslog/logger.go

@@ -6,6 +6,7 @@ import (
 	"io"
 	"net"
 	"net/http"
+	"net/textproto"
 	"net/url"
 	"os"
 	"path/filepath"
@@ -100,6 +101,17 @@ func NewHandler(config *types.AccessLog) (*Handler, error) {
 		Level:     logrus.InfoLevel,
 	}
 
+	// Transform headers names in config to a canonical form, to be used as is without further transformations.
+	if config.Fields != nil && config.Fields.Headers != nil && len(config.Fields.Headers.Names) > 0 {
+		fields := map[string]string{}
+
+		for h, v := range config.Fields.Headers.Names {
+			fields[textproto.CanonicalMIMEHeaderKey(h)] = v
+		}
+
+		config.Fields.Headers.Names = fields
+	}
+
 	logHandler := &Handler{
 		config:         config,
 		logger:         logger,

pkg/middlewares/accesslog/logger_test.go

@@ -41,11 +41,7 @@ var (
 )
 
 func TestLogRotation(t *testing.T) {
-	tempDir, err := ioutil.TempDir("", "traefik_")
-	if err != nil {
-		t.Fatalf("Error setting up temporary directory: %s", err)
-	}
-	defer os.RemoveAll(tempDir)
+	tempDir := createTempDir(t, "traefik_")
 
 	fileName := filepath.Join(tempDir, "traefik.log")
 	rotatedFileName := fileName + ".rotated"
@@ -119,9 +115,106 @@ func lineCount(t *testing.T, fileName string) int {
 	return count
 }
 
+func TestLoggerHeaderFields(t *testing.T) {
+	tmpDir := createTempDir(t, CommonFormat)
+
+	expectedValue := "expectedValue"
+
+	testCases := []struct {
+		desc            string
+		accessLogFields types.AccessLogFields
+		header          string
+		expected        string
+	}{
+		{
+			desc:     "with default mode",
+			header:   "User-Agent",
+			expected: types.AccessLogDrop,
+			accessLogFields: types.AccessLogFields{
+				DefaultMode: types.AccessLogDrop,
+				Headers: &types.FieldHeaders{
+					DefaultMode: types.AccessLogDrop,
+					Names:       map[string]string{},
+				},
+			},
+		},
+		{
+			desc:     "with exact header name",
+			header:   "User-Agent",
+			expected: types.AccessLogKeep,
+			accessLogFields: types.AccessLogFields{
+				DefaultMode: types.AccessLogDrop,
+				Headers: &types.FieldHeaders{
+					DefaultMode: types.AccessLogDrop,
+					Names: map[string]string{
+						"User-Agent": types.AccessLogKeep,
+					},
+				},
+			},
+		},
+		{
+			desc:     "with case insensitive match on header name",
+			header:   "User-Agent",
+			expected: types.AccessLogKeep,
+			accessLogFields: types.AccessLogFields{
+				DefaultMode: types.AccessLogDrop,
+				Headers: &types.FieldHeaders{
+					DefaultMode: types.AccessLogDrop,
+					Names: map[string]string{
+						"user-agent": types.AccessLogKeep,
+					},
+				},
+			},
+		},
+	}
+
+	for _, test := range testCases {
+		test := test
+		t.Run(test.desc, func(t *testing.T) {
+			logFile, err := ioutil.TempFile(tmpDir, "*.log")
+			require.NoError(t, err)
+
+			config := &types.AccessLog{
+				FilePath: logFile.Name(),
+				Format:   CommonFormat,
+				Fields:   &test.accessLogFields,
+			}
+
+			logger, err := NewHandler(config)
+			require.NoError(t, err)
+			defer logger.Close()
+
+			if config.FilePath != "" {
+				_, err = os.Stat(config.FilePath)
+				require.NoError(t, err, fmt.Sprintf("logger should create %s", config.FilePath))
+			}
+
+			req := &http.Request{
+				Header: map[string][]string{},
+				URL: &url.URL{
+					Path: testPath,
+				},
+			}
+			req.Header.Set(test.header, expectedValue)
+
+			logger.ServeHTTP(httptest.NewRecorder(), req, http.HandlerFunc(func(writer http.ResponseWriter, r *http.Request) {
+				writer.WriteHeader(http.StatusOK)
+			}))
+
+			logData, err := ioutil.ReadFile(logFile.Name())
+			require.NoError(t, err)
+
+			if test.expected == types.AccessLogDrop {
+				assert.NotContains(t, string(logData), expectedValue)
+			} else {
+				assert.Contains(t, string(logData), expectedValue)
+			}
+		})
+	}
+}
+
 func TestLoggerCLF(t *testing.T) {
 	tmpDir := createTempDir(t, CommonFormat)
-	defer os.RemoveAll(tmpDir)
 
 	logFilePath := filepath.Join(tmpDir, logFileNameSuffix)
 	config := &types.AccessLog{FilePath: logFilePath, Format: CommonFormat}
@@ -136,7 +229,6 @@ func TestLoggerCLF(t *testing.T) {
 
 func TestAsyncLoggerCLF(t *testing.T) {
 	tmpDir := createTempDir(t, CommonFormat)
-	defer os.RemoveAll(tmpDir)
 
 	logFilePath := filepath.Join(tmpDir, logFileNameSuffix)
 	config := &types.AccessLog{FilePath: logFilePath, Format: CommonFormat, BufferingSize: 1024}
@@ -358,7 +450,6 @@ func TestLoggerJSON(t *testing.T) {
 			t.Parallel()
 
 			tmpDir := createTempDir(t, JSONFormat)
-			defer os.RemoveAll(tmpDir)
 
 			logFilePath := filepath.Join(tmpDir, logFileNameSuffix)
 
@@ -642,6 +733,8 @@ func createTempDir(t *testing.T, prefix string) string {
 	tmpDir, err := ioutil.TempDir("", prefix)
 	require.NoError(t, err, "failed to create temp dir")
 
+	t.Cleanup(func() { _ = os.RemoveAll(tmpDir) })
+
 	return tmpDir
 }
 

pkg/provider/traefik/fixtures/redirection_with_protocol.json

@@ -0,0 +1,30 @@
+{
+  "http": {
+    "routers": {
+      "web-to-websecure": {
+        "entryPoints": [
+          "web"
+        ],
+        "middlewares": [
+          "redirect-web-to-websecure"
+        ],
+        "service": "noop@internal",
+        "rule": "HostRegexp(`{host:.+}`)"
+      }
+    },
+    "middlewares": {
+      "redirect-web-to-websecure": {
+        "redirectScheme": {
+          "scheme": "https",
+          "port": "443",
+          "permanent": true
+        }
+      }
+    },
+    "services": {
+      "noop": {}
+    }
+  },
+  "tcp": {},
+  "tls": {}
+}

pkg/provider/traefik/internal.go

@@ -142,7 +142,7 @@ func (i *Provider) getEntryPointPort(name string, def *static.Redirections) (str
 		return "", fmt.Errorf("'to' entry point field references a non-existing entry point: %s", def.EntryPoint.To)
 	}
 
-	_, port, err := net.SplitHostPort(dst.Address)
+	_, port, err := net.SplitHostPort(dst.GetAddress())
 	if err != nil {
 		return "", fmt.Errorf("invalid entry point %q address %q: %w",
 			name, i.staticCfg.EntryPoints[def.EntryPoint.To].Address, err)

pkg/provider/traefik/internal_test.go

@@ -232,6 +232,28 @@ func Test_createConfiguration(t *testing.T) {
 				},
 			},
 		},
+		{
+			desc: "redirection_with_protocol.json",
+			staticCfg: static.Configuration{
+				EntryPoints: map[string]*static.EntryPoint{
+					"web": {
+						Address: ":80",
+						HTTP: static.HTTPConfig{
+							Redirections: &static.Redirections{
+								EntryPoint: &static.RedirectEntryPoint{
+									To:        "websecure",
+									Scheme:    "https",
+									Permanent: true,
+								},
+							},
+						},
+					},
+					"websecure": {
+						Address: ":443/tcp",
+					},
+				},
+			},
+		},
 	}
 
 	for _, test := range testCases {

pkg/server/router/tcp/router.go

@@ -5,7 +5,9 @@ import (
 	"crypto/tls"
 	"errors"
 	"fmt"
+	"net"
 	"net/http"
+	"strings"
 
 	"github.com/containous/traefik/v2/pkg/config/runtime"
 	"github.com/containous/traefik/v2/pkg/log"
@@ -99,14 +101,13 @@ func (m *Manager) buildEntryPointHandler(ctx context.Context, configs map[string
 		log.FromContext(ctx).Errorf("Error during the build of the default TLS configuration: %v", err)
 	}
 
-	router.HTTPSHandler(handlerHTTPS, defaultTLSConf)
-
 	if len(configsHTTP) > 0 {
 		router.AddRouteHTTPTLS("*", defaultTLSConf)
 	}
 
 	// Keyed by domain, then by options reference.
 	tlsOptionsForHostSNI := map[string]map[string]nameAndConfig{}
+	tlsOptionsForHost := map[string]string{}
 	for routerHTTPName, routerHTTPConfig := range configsHTTP {
 		if len(routerHTTPConfig.TLS.Options) == 0 || routerHTTPConfig.TLS.Options == defaultTLSConfigName {
 			continue
@@ -141,6 +142,7 @@ func (m *Manager) buildEntryPointHandler(ctx context.Context, configs map[string
 					continue
 				}
 
+				// domain is already in lower case thanks to the domain parsing
 				if tlsOptionsForHostSNI[domain] == nil {
 					tlsOptionsForHostSNI[domain] = make(map[string]nameAndConfig)
 				}
@@ -148,10 +150,52 @@ func (m *Manager) buildEntryPointHandler(ctx context.Context, configs map[string
 					routerName: routerHTTPName,
 					TLSConfig:  tlsConf,
 				}
+
+				if _, ok := tlsOptionsForHost[domain]; ok {
+					// Multiple tlsOptions fallback to default
+					tlsOptionsForHost[domain] = "default"
+				} else {
+					tlsOptionsForHost[domain] = routerHTTPConfig.TLS.Options
+				}
 			}
 		}
 	}
 
+	sniCheck := http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
+		if req.TLS == nil {
+			handlerHTTPS.ServeHTTP(rw, req)
+			return
+		}
+
+		host, _, err := net.SplitHostPort(req.Host)
+		if err != nil {
+			host = req.Host
+		}
+
+		host = strings.TrimSpace(host)
+		serverName := strings.TrimSpace(req.TLS.ServerName)
+
+		// Domain Fronting
+		if !strings.EqualFold(host, serverName) {
+			tlsOptionSNI := findTLSOptionName(tlsOptionsForHost, serverName)
+			tlsOptionHeader := findTLSOptionName(tlsOptionsForHost, host)
+
+			if tlsOptionHeader != tlsOptionSNI {
+				log.WithoutContext().
+					WithField("host", host).
+					WithField("req.Host", req.Host).
+					WithField("req.TLS.ServerName", req.TLS.ServerName).
+					Debugf("TLS options difference: SNI=%s, Header:%s", tlsOptionSNI, tlsOptionHeader)
+				http.Error(rw, http.StatusText(http.StatusMisdirectedRequest), http.StatusMisdirectedRequest)
+				return
+			}
+		}
+
+		handlerHTTPS.ServeHTTP(rw, req)
+	})
+
+	router.HTTPSHandler(sniCheck, defaultTLSConf)
+
 	logger := log.FromContext(ctx)
 	for hostSNI, tlsConfigs := range tlsOptionsForHostSNI {
 		if len(tlsConfigs) == 1 {
@@ -248,3 +292,17 @@ func (m *Manager) buildEntryPointHandler(ctx context.Context, configs map[string
 
 	return router, nil
 }
+
+func findTLSOptionName(tlsOptionsForHost map[string]string, host string) string {
+	tlsOptions, ok := tlsOptionsForHost[host]
+	if ok {
+		return tlsOptions
+	}
+
+	tlsOptions, ok = tlsOptionsForHost[strings.ToLower(host)]
+	if ok {
+		return tlsOptions
+	}
+
+	return "default"
+}

pkg/tcp/router.go

@@ -11,6 +11,7 @@ import (
 	"time"
 
 	"github.com/containous/traefik/v2/pkg/log"
+	"github.com/containous/traefik/v2/pkg/types"
 )
 
 // Router is a TCP router.
@@ -65,7 +66,7 @@ func (r *Router) ServeTCP(conn WriteCloser) {
 	}
 
 	// FIXME Optimize and test the routing table before helloServerName
-	serverName = strings.ToLower(serverName)
+	serverName = types.CanonicalDomain(serverName)
 	if r.routingTable != nil && serverName != "" {
 		if target, ok := r.routingTable[serverName]; ok {
 			target.ServeTCP(r.GetConn(conn, peeked))