Use utls for ClientHello fingerprint

Close #223
3 months ago · 6417e3393d
parent b3ec1ab3bc
commit 6417e3393d
12 changed files with 441 additions and 530 deletions
--- a/go.mod
+++ b/go.mod
@ -4,14 +4,14 @@ go 1.14

 require (
 	github.com/cbeuw/connutil v0.0.0-20200411215123-966bfaa51ee3
-	github.com/gorilla/mux v1.8.0
-	github.com/gorilla/websocket v1.4.2
-	github.com/juju/ratelimit v1.0.1
-	github.com/kr/pretty v0.1.0 // indirect
-	github.com/sirupsen/logrus v1.8.1
-	github.com/stretchr/testify v1.6.1
+	github.com/gorilla/mux v1.8.1
+	github.com/gorilla/websocket v1.5.1
+	github.com/juju/ratelimit v1.0.2
+	github.com/refraction-networking/utls v1.6.2
+	github.com/sirupsen/logrus v1.9.3
+	github.com/stretchr/testify v1.8.1
 	gitlab.com/yawning/utls.git v0.0.12-1
-	go.etcd.io/bbolt v1.3.6
-	golang.org/x/crypto v0.1.0
-	gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 // indirect
+	go.etcd.io/bbolt v1.3.8
+	golang.org/x/crypto v0.19.0
+	golang.org/x/net v0.21.0 // indirect
 )
--- a/go.sum
+++ b/go.sum
@ -1,76 +1,425 @@
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--- a/internal/client/TLS.go
+++ b/internal/client/TLS.go
@ -1,12 +1,11 @@
 package client

 import (
-	"encoding/binary"
-	"encoding/hex"
+	utls "github.com/refraction-networking/utls"
+	log "github.com/sirupsen/logrus"
 	"net"

 	"github.com/cbeuw/Cloak/internal/common"
-	log "github.com/sirupsen/logrus"
 )

 const appDataMaxLength = 16401
@ -18,63 +17,84 @@ type clientHelloFields struct {
 	serverName     string
 }

-func decodeHex(s string) []byte {
-	b, err := hex.DecodeString(s)
-	if err != nil {
-		panic(err)
-	}
-	return b
-}
-
-type browser interface {
-	composeClientHello(clientHelloFields) []byte
-}
-
-func generateSNI(serverName string) []byte {
-	serverNameListLength := make([]byte, 2)
-	binary.BigEndian.PutUint16(serverNameListLength, uint16(len(serverName)+3))
-	serverNameType := []byte{0x00} // host_name
-	serverNameLength := make([]byte, 2)
-	binary.BigEndian.PutUint16(serverNameLength, uint16(len(serverName)))
-	ret := make([]byte, 2+1+2+len(serverName))
-	copy(ret[0:2], serverNameListLength)
-	copy(ret[2:3], serverNameType)
-	copy(ret[3:5], serverNameLength)
-	copy(ret[5:], serverName)
-	return ret
-}
+type browser int

-// addExtensionRecord, add type, length to extension data
-func addExtRec(typ []byte, data []byte) []byte {
-	length := make([]byte, 2)
-	binary.BigEndian.PutUint16(length, uint16(len(data)))
-	ret := make([]byte, 2+2+len(data))
-	copy(ret[0:2], typ)
-	copy(ret[2:4], length)
-	copy(ret[4:], data)
-	return ret
-}
+const (
+	chrome = iota
+	firefox
+	safari
+)

 type DirectTLS struct {
 	*common.TLSConn
 	browser browser
 }

-// NewClientTransport handles the TLS handshake for a given conn and returns the sessionKey
+func buildClientHello(browser browser, fields clientHelloFields) ([]byte, error) {
+	// We don't use utls to handle connections (as it'll attempt a real TLS negotiation)
+	// We only want it to build the ClientHello locally
+	fakeConn := net.TCPConn{}
+	var helloID utls.ClientHelloID
+	switch browser {
+	case chrome:
+		helloID = utls.HelloChrome_Auto
+	case firefox:
+		helloID = utls.HelloFirefox_Auto
+	case safari:
+		helloID = utls.HelloSafari_Auto
+	}
+
+	uclient := utls.UClient(&fakeConn, &utls.Config{ServerName: fields.serverName}, helloID)
+	if err := uclient.BuildHandshakeState(); err != nil {
+		return []byte{}, err
+	}
+	if err := uclient.SetClientRandom(fields.random); err != nil {
+		return []byte{}, err
+	}
+
+	uclient.HandshakeState.Hello.SessionId = make([]byte, 32)
+	copy(uclient.HandshakeState.Hello.SessionId, fields.sessionId)
+
+	// Find the X25519 key share and overwrite it
+	var extIndex int
+	var keyShareIndex int
+	for i, ext := range uclient.Extensions {
+		ext, ok := ext.(*utls.KeyShareExtension)
+		if ok {
+			extIndex = i
+			for j, keyShare := range ext.KeyShares {
+				if keyShare.Group == utls.X25519 {
+					keyShareIndex = j
+				}
+			}
+		}
+	}
+	copy(uclient.Extensions[extIndex].(*utls.KeyShareExtension).KeyShares[keyShareIndex].Data, fields.x25519KeyShare)
+
+	if err := uclient.BuildHandshakeState(); err != nil {
+		return []byte{}, err
+	}
+	return uclient.HandshakeState.Hello.Raw, nil
+}
+
+// Handshake handles the TLS handshake for a given conn and returns the sessionKey
 // if the server proceed with Cloak authentication
 func (tls *DirectTLS) Handshake(rawConn net.Conn, authInfo AuthInfo) (sessionKey [32]byte, err error) {
 	payload, sharedSecret := makeAuthenticationPayload(authInfo)

-	// random is marshalled ephemeral pub key 32 bytes
-	// The authentication ciphertext and its tag are then distributed among SessionId and X25519KeyShare
 	fields := clientHelloFields{
 		random:         payload.randPubKey[:],
 		sessionId:      payload.ciphertextWithTag[0:32],
 		x25519KeyShare: payload.ciphertextWithTag[32:64],
 		serverName:     authInfo.MockDomain,
 	}
-	chOnly := tls.browser.composeClientHello(fields)
-	chWithRecordLayer := common.AddRecordLayer(chOnly, common.Handshake, common.VersionTLS11)
+
+	var ch []byte
+	ch, err = buildClientHello(tls.browser, fields)
+	if err != nil {
+		return
+	}
+	chWithRecordLayer := common.AddRecordLayer(ch, common.Handshake, common.VersionTLS11)
 	_, err = rawConn.Write(chWithRecordLayer)
 	if err != nil {
 		return
--- a/internal/client/TLS_test.go
+++ b/internal/client/TLS_test.go
@ -1,39 +0,0 @@
-package client
-
-import (
-	"encoding/hex"
-	"testing"
-
-	"github.com/stretchr/testify/assert"
-)
-
-func htob(s string) []byte {
-	b, _ := hex.DecodeString(s)
-	return b
-}
-
-func TestMakeServerName(t *testing.T) {
-	type testingPair struct {
-		serverName string
-		target     []byte
-	}
-
-	pairs := []testingPair{
-		{
-			"www.google.com",
-			htob("001100000e7777772e676f6f676c652e636f6d"),
-		},
-		{
-			"www.gstatic.com",
-			htob("001200000f7777772e677374617469632e636f6d"),
-		},
-		{
-			"googleads.g.doubleclick.net",
-			htob("001e00001b676f6f676c656164732e672e646f75626c65636c69636b2e6e6574"),
-		},
-	}
-
-	for _, p := range pairs {
-		assert.Equal(t, p.target, generateSNI(p.serverName))
-	}
-}
--- a/internal/client/chrome.go
+++ b/internal/client/chrome.go
@ -1,120 +0,0 @@
-// Fingerprint of Chrome 112
-
-package client
-
-import (
-	"encoding/binary"
-	"github.com/cbeuw/Cloak/internal/common"
-	"math/rand"
-)
-
-type Chrome struct{}
-
-func makeGREASE() []byte {
-	// see https://tools.ietf.org/html/draft-davidben-tls-grease-01
-	// This is exclusive to Chrome.
-	var one [1]byte
-	common.CryptoRandRead(one[:])
-	sixteenth := one[0] % 16
-	monoGREASE := sixteenth*16 + 0xA
-	doubleGREASE := []byte{monoGREASE, monoGREASE}
-	return doubleGREASE
-}
-
-func (c *Chrome) composeExtensions(serverName string, keyShare []byte) []byte {
-
-	makeSupportedGroups := func() []byte {
-		suppGroupListLen := []byte{0x00, 0x08}
-		ret := make([]byte, 2+8)
-		copy(ret[0:2], suppGroupListLen)
-		copy(ret[2:4], makeGREASE())
-		copy(ret[4:], []byte{0x00, 0x1d, 0x00, 0x17, 0x00, 0x18})
-		return ret
-	}
-
-	makeKeyShare := func(hidden []byte) []byte {
-		ret := make([]byte, 43)
-		ret[0], ret[1] = 0x00, 0x29 // length 41
-		copy(ret[2:4], makeGREASE())
-		ret[4], ret[5] = 0x00, 0x01 // length 1
-		ret[6] = 0x00
-		ret[7], ret[8] = 0x00, 0x1d  // group x25519
-		ret[9], ret[10] = 0x00, 0x20 // length 32
-		copy(ret[11:43], hidden)
-		return ret
-	}
-
-	shuffle := func(exts [][]byte) {
-		var qword [8]byte
-		common.CryptoRandRead(qword[:])
-		seed := int64(binary.BigEndian.Uint64(qword[:]))
-		source := rand.NewSource(seed)
-		r := rand.New(source)
-		r.Shuffle(len(exts), func(i, j int) { exts[i], exts[j] = exts[j], exts[i] })
-	}
-
-	// extension length is always 403, and server name length is variable
-	var ext [18][]byte
-	ext[0] = addExtRec(makeGREASE(), nil) // First GREASE
-
-	// Start shufflable extensions: https://chromestatus.com/feature/5124606246518784
-	ext[1] = addExtRec([]byte{0x00, 0x00}, generateSNI(serverName)) // server name indication
-	sniLen := len(ext[1])
-	ext[2] = addExtRec([]byte{0x00, 0x17}, nil)                                               // extended_master_secret
-	ext[3] = addExtRec([]byte{0xff, 0x01}, []byte{0x00})                                      // renegotiation_info
-	ext[4] = addExtRec([]byte{0x00, 0x0a}, makeSupportedGroups())                             // supported groups
-	ext[5] = addExtRec([]byte{0x00, 0x0b}, []byte{0x01, 0x00})                                // ec point formats
-	ext[6] = addExtRec([]byte{0x00, 0x23}, nil)                                               // Session tickets
-	ext[7] = addExtRec([]byte{0x00, 0x10}, decodeHex("000c02683208687474702f312e31"))         // app layer proto negotiation
-	ext[8] = addExtRec([]byte{0x00, 0x05}, []byte{0x01, 0x00, 0x00, 0x00, 0x00})              // status request
-	ext[9] = addExtRec([]byte{0x00, 0x0d}, decodeHex("001004030804040105030805050108060601")) // Signature Algorithms
-	ext[10] = addExtRec([]byte{0x00, 0x12}, nil)                                              // signed cert timestamp
-	ext[11] = addExtRec([]byte{0x00, 0x33}, makeKeyShare(keyShare))                           // key share
-	ext[12] = addExtRec([]byte{0x00, 0x2d}, []byte{0x01, 0x01})                               // psk key exchange modes
-	suppVersions := decodeHex("069A9A03040303")                                               // 9A9A needs to be a GREASE
-	copy(suppVersions[1:3], makeGREASE())
-	ext[13] = addExtRec([]byte{0x00, 0x2b}, suppVersions)             // supported versions
-	ext[14] = addExtRec([]byte{0x00, 0x1b}, []byte{0x02, 0x00, 0x02}) // compress certificate
-	ext[15] = addExtRec([]byte{0x44, 0x69}, decodeHex("0003026832"))  // application settings
-	// End shufflable extensions
-
-	shuffle(ext[1:16])
-
-	ext[16] = addExtRec(makeGREASE(), []byte{0x00}) // Last GREASE
-	// sniLen + len(all other ext) + len(ext[17]) = 403
-	// len(all other ext) = 175
-	// len(ext[17]) = 228 - sniLen
-	// 2+2+len(padding) = 228 - sniLen
-	// len(padding) = 224 - sniLen
-	ext[17] = addExtRec([]byte{0x00, 0x15}, make([]byte, 224-sniLen)) // padding
-	var ret []byte
-	for _, e := range ext {
-		ret = append(ret, e...)
-	}
-	return ret
-}
-
-func (c *Chrome) composeClientHello(hd clientHelloFields) (ch []byte) {
-	var clientHello [12][]byte
-	clientHello[0] = []byte{0x01}                                                                                       // handshake type
-	clientHello[1] = []byte{0x00, 0x01, 0xfc}                                                                           // length 508
-	clientHello[2] = []byte{0x03, 0x03}                                                                                 // client version
-	clientHello[3] = hd.random                                                                                          // random
-	clientHello[4] = []byte{0x20}                                                                                       // session id length 32
-	clientHello[5] = hd.sessionId                                                                                       // session id
-	clientHello[6] = []byte{0x00, 0x20}                                                                                 // cipher suites length 32
-	clientHello[7] = append(makeGREASE(), decodeHex("130113021303c02bc02fc02cc030cca9cca8c013c014009c009d002f0035")...) // cipher suites
-	clientHello[8] = []byte{0x01}                                                                                       // compression methods length 1
-	clientHello[9] = []byte{0x00}                                                                                       // compression methods
-
-	extensions := c.composeExtensions(hd.serverName, hd.x25519KeyShare)
-	clientHello[10] = []byte{0x00, 0x00}
-	binary.BigEndian.PutUint16(clientHello[10], uint16(len(extensions))) // extension length
-	clientHello[11] = extensions
-
-	var ret []byte
-	for _, c := range clientHello {
-		ret = append(ret, c...)
-	}
-	return ret
-}
--- a/internal/client/chrome_test.go
+++ b/internal/client/chrome_test.go
@ -1,60 +0,0 @@
-package client
-
-import (
-	"encoding/hex"
-	"testing"
-)
-
-func TestMakeGREASE(t *testing.T) {
-	a := hex.EncodeToString(makeGREASE())
-	if a[1] != 'a' || a[3] != 'a' {
-		t.Errorf("GREASE got %v", a)
-	}
-
-	var GREASEs []string
-	for i := 0; i < 50; i++ {
-		GREASEs = append(GREASEs, hex.EncodeToString(makeGREASE()))
-	}
-	var eqCount int
-	for _, g := range GREASEs {
-		if a == g {
-			eqCount++
-		}
-	}
-	if eqCount > 40 {
-		t.Error("GREASE is not random", GREASEs)
-	}
-}
-
-//func TestChromeJA3(t *testing.T) {
-//	result := common.AddRecordLayer((&Chrome{}).composeClientHello(hd), common.Handshake, common.VersionTLS11)
-//	assert.Equal(t, 517, len(result))
-//
-//	hello := tlsx.ClientHelloBasic{}
-//	err := hello.Unmarshal(result)
-//	assert.Nil(t, err)
-//
-//	// Chrome shuffles the order of extensions, so it needs special handling
-//	full := string(ja3.Bare(&hello))
-//	// TLSVersion,Ciphers,Extensions,EllipticCurves,EllipticCurvePointFormats
-//	parts := strings.Split(full, ",")
-//
-//	// TLSVersion,Ciphers
-//	assert.Equal(t,
-//		[]string{
-//			"771",
-//			"4865-4866-4867-49195-49199-49196-49200-52393-52392-49171-49172-156-157-47-53",
-//		}, parts[0:2])
-//	// EllipticCurves,EllipticCurvePointFormats
-//	assert.Equal(t,
-//		[]string{
-//			"29-23-24", "0",
-//		}, parts[3:5])
-//
-//	normaliseExtensions := func(extensions string) []string {
-//		extensionParts := strings.Split(parts[2], "-")
-//		sort.Strings(extensionParts)
-//		return extensionParts
-//	}
-//	assert.Equal(t, normaliseExtensions("10-5-45-0-17513-13-18-11-23-16-35-27-65281-43-51-21"), normaliseExtensions(parts[2]))
-//}
--- a/internal/client/connector.go
+++ b/internal/client/connector.go
@ -34,8 +34,8 @@ func MakeSession(connConfig RemoteConnConfig, authInfo AuthInfo, dialer common.D
 			transportConn := connConfig.TransportMaker()
 			sk, err := transportConn.Handshake(remoteConn, authInfo)
 			if err != nil {
-				transportConn.Close()
 				log.Errorf("Failed to prepare connection to remote: %v", err)
+				transportConn.Close()
 				time.Sleep(time.Second * 3)
 				goto makeconn
 			}
--- a/internal/client/firefox.go
+++ b/internal/client/firefox.go
@ -1,73 +0,0 @@
-// Fingerprint of Firefox 112
-
-package client
-
-import (
-	"encoding/binary"
-	"github.com/cbeuw/Cloak/internal/common"
-)
-
-type Firefox struct{}
-
-func (f *Firefox) composeExtensions(serverName string, keyShare []byte) []byte {
-	composeKeyShare := func(hidden []byte) []byte {
-		ret := make([]byte, 107)
-		ret[0], ret[1] = 0x00, 0x69 // length 105
-		ret[2], ret[3] = 0x00, 0x1d // group x25519
-		ret[4], ret[5] = 0x00, 0x20 // length 32
-		copy(ret[6:38], hidden)
-		ret[38], ret[39] = 0x00, 0x17 // group secp256r1
-		ret[40], ret[41] = 0x00, 0x41 // length 65
-		common.CryptoRandRead(ret[42:107])
-		return ret
-	}
-	// extension length is always 401, and server name length is variable
-	var ext [13][]byte
-	ext[0] = addExtRec([]byte{0x00, 0x00}, generateSNI(serverName))                                        // server name indication
-	ext[1] = addExtRec([]byte{0x00, 0x17}, nil)                                                            // extended_master_secret
-	ext[2] = addExtRec([]byte{0xff, 0x01}, []byte{0x00})                                                   // renegotiation_info
-	ext[3] = addExtRec([]byte{0x00, 0x0a}, decodeHex("000c001d00170018001901000101"))                      // supported groups
-	ext[4] = addExtRec([]byte{0x00, 0x0b}, []byte{0x01, 0x00})                                             // ec point formats
-	ext[5] = addExtRec([]byte{0x00, 0x10}, decodeHex("000c02683208687474702f312e31"))                      // app layer proto negotiation
-	ext[6] = addExtRec([]byte{0x00, 0x05}, []byte{0x01, 0x00, 0x00, 0x00, 0x00})                           // status request
-	ext[7] = addExtRec([]byte{0x00, 0x22}, decodeHex("00080403050306030203"))                              // delegated credentials
-	ext[8] = addExtRec([]byte{0x00, 0x33}, composeKeyShare(keyShare))                                      // key share
-	ext[9] = addExtRec([]byte{0x00, 0x2b}, decodeHex("0403040303"))                                        // supported versions
-	ext[10] = addExtRec([]byte{0x00, 0x0d}, decodeHex("001604030503060308040805080604010501060102030201")) // Signature Algorithms
-	ext[11] = addExtRec([]byte{0x00, 0x1c}, []byte{0x40, 0x01})                                            // record size limit
-	// len(ext[0]) + len(all other ext) + len(len field of padding) + len(padding) = 401
-	// len(all other ext) = 228
-	// len(len field of padding) = 4
-	// len(padding) = 169 - len(ext[0])
-	ext[12] = addExtRec([]byte{0x00, 0x15}, make([]byte, 169-len(ext[0]))) // padding
-	var ret []byte
-	for _, e := range ext {
-		ret = append(ret, e...)
-	}
-	return ret
-}
-
-func (f *Firefox) composeClientHello(hd clientHelloFields) (ch []byte) {
-	var clientHello [12][]byte
-	clientHello[0] = []byte{0x01}                                                                      // handshake type
-	clientHello[1] = []byte{0x00, 0x01, 0xfc}                                                          // length 508
-	clientHello[2] = []byte{0x03, 0x03}                                                                // client version
-	clientHello[3] = hd.random                                                                         // random
-	clientHello[4] = []byte{0x20}                                                                      // session id length 32
-	clientHello[5] = hd.sessionId                                                                      // session id
-	clientHello[6] = []byte{0x00, 0x22}                                                                // cipher suites length 34
-	clientHello[7] = decodeHex("130113031302c02bc02fcca9cca8c02cc030c00ac009c013c014009c009d002f0035") // cipher suites
-	clientHello[8] = []byte{0x01}                                                                      // compression methods length 1
-	clientHello[9] = []byte{0x00}                                                                      // compression methods
-
-	extensions := f.composeExtensions(hd.serverName, hd.x25519KeyShare)
-	clientHello[10] = []byte{0x00, 0x00}
-	binary.BigEndian.PutUint16(clientHello[10], uint16(len(extensions))) // extension length
-	clientHello[11] = extensions
-
-	var ret []byte
-	for _, c := range clientHello {
-		ret = append(ret, c...)
-	}
-	return ret
-}
--- a/internal/client/firefox_test.go
+++ b/internal/client/firefox_test.go
@ -1,40 +0,0 @@
-package client
-
-import (
-	"encoding/hex"
-	"github.com/stretchr/testify/assert"
-	"strings"
-	"testing"
-)
-
-var hd = clientHelloFields{
-	random:         decodeHex("ed0117085ed70be0799b1fc96af7f675d4747f86cd03bb36392e03e8d1b0e9a0"),
-	sessionId:      decodeHex("47485f67c59ca787009bba83ede4da4f2397169c696c275d96c4c7af803019b9"),
-	x25519KeyShare: decodeHex("d395003163a6f751b4c68a67bcec1f883885a7ada8a63fda389b29986e51fa44"),
-	serverName:     "github.com",
-}
-
-//func TestFirefoxJA3(t *testing.T) {
-//	result := common.AddRecordLayer((&Firefox{}).composeClientHello(hd), common.Handshake, common.VersionTLS11)
-//
-//	hello := tlsx.ClientHelloBasic{}
-//	err := hello.Unmarshal(result)
-//	assert.Nil(t, err)
-//
-//	digest := ja3.DigestHex(&hello)
-//	assert.Equal(t, "ad55557b7cbd735c2627f7ebb3b3d493", digest)
-//}
-
-func TestFirefoxComposeClientHello(t *testing.T) {
-	result := hex.EncodeToString((&Firefox{}).composeClientHello(hd))
-	target := "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"
-
-	// skip random secp256r1
-	secp256r1 := "04c49751010e35370cf8e89c23471b40579387b3dd5ce6862c9850b121632b527128b75ef7051c5284ae94894d846cc3dc88ce01ce49b605167f63473c1d772b47"
-	start := strings.Index(target, secp256r1)
-
-	target = strings.Replace(target, secp256r1, "", 1)
-	result = strings.Replace(result, result[start:start+len(secp256r1)], "", 1)
-
-	assert.Equal(t, target, result)
-}
--- a/internal/client/safari.go
+++ b/internal/client/safari.go
@ -1,88 +0,0 @@
-// Fingerprint of Safari 16.4
-
-package client
-
-import (
-	"encoding/binary"
-)
-
-type Safari struct{}
-
-func (s *Safari) composeExtensions(serverName string, keyShare []byte) []byte {
-	makeSupportedGroups := func() []byte {
-		suppGroupListLen := []byte{0x00, 0x0a}
-		ret := make([]byte, 2+2+8)
-		copy(ret[0:2], suppGroupListLen)
-		copy(ret[2:4], makeGREASE())
-		copy(ret[4:], []byte{0x00, 0x1d, 0x00, 0x17, 0x00, 0x18, 0x00, 0x19})
-		return ret
-	}
-
-	makeKeyShare := func(hidden []byte) []byte {
-		ret := make([]byte, 43)
-		ret[0], ret[1] = 0x00, 0x29 // length 41
-		copy(ret[2:4], makeGREASE())
-		ret[4], ret[5] = 0x00, 0x01 // length 1
-		ret[6] = 0x00
-		ret[7], ret[8] = 0x00, 0x1d  // group x25519
-		ret[9], ret[10] = 0x00, 0x20 // length 32
-		copy(ret[11:43], hidden)
-		return ret
-	}
-
-	// extension length is always 393, and server name length is variable
-	var ext [16][]byte
-	ext[0] = addExtRec(makeGREASE(), nil)                                                                 // First GREASE
-	ext[1] = addExtRec([]byte{0x00, 0x00}, generateSNI(serverName))                                       // server name indication
-	ext[2] = addExtRec([]byte{0x00, 0x17}, nil)                                                           // extended_master_secret
-	ext[3] = addExtRec([]byte{0xff, 0x01}, []byte{0x00})                                                  // renegotiation_info
-	ext[4] = addExtRec([]byte{0x00, 0x0a}, makeSupportedGroups())                                         // supported groups
-	ext[5] = addExtRec([]byte{0x00, 0x0b}, []byte{0x01, 0x00})                                            // ec point formats
-	ext[6] = addExtRec([]byte{0x00, 0x10}, decodeHex("000c02683208687474702f312e31"))                     // app layer proto negotiation
-	ext[7] = addExtRec([]byte{0x00, 0x05}, []byte{0x01, 0x00, 0x00, 0x00, 0x00})                          // status request
-	ext[8] = addExtRec([]byte{0x00, 0x0d}, decodeHex("001604030804040105030203080508050501080606010201")) // Signature Algorithms
-	ext[9] = addExtRec([]byte{0x00, 0x12}, nil)                                                           // signed cert timestamp
-	ext[10] = addExtRec([]byte{0x00, 0x33}, makeKeyShare(keyShare))                                       // key share
-	ext[11] = addExtRec([]byte{0x00, 0x2d}, []byte{0x01, 0x01})                                           // psk key exchange modes
-	suppVersions := decodeHex("0a5a5a0304030303020301")                                                   // 5a5a needs to be a GREASE
-	copy(suppVersions[1:3], makeGREASE())
-	ext[12] = addExtRec([]byte{0x00, 0x2b}, suppVersions)             // supported versions
-	ext[13] = addExtRec([]byte{0x00, 0x1b}, []byte{0x02, 0x00, 0x01}) // compress certificate
-	ext[14] = addExtRec(makeGREASE(), []byte{0x00})                   // Last GREASE
-	// len(ext[1]) + len(all other ext) + len(ext[15]) = 393
-	// len(all other ext) = 174
-	// len(ext[15]) = 219 - len(ext[1])
-	// 2+2+len(padding) = 219 - len(ext[1])
-	// len(padding) = 215 - len(ext[1])
-	ext[15] = addExtRec([]byte{0x00, 0x15}, make([]byte, 215-len(ext[1]))) // padding
-	var ret []byte
-	for _, e := range ext {
-		ret = append(ret, e...)
-	}
-	return ret
-}
-
-func (s *Safari) composeClientHello(hd clientHelloFields) (ch []byte) {
-	var clientHello [12][]byte
-	clientHello[0] = []byte{0x01}                                                                                                           // handshake type
-	clientHello[1] = []byte{0x00, 0x01, 0xfc}                                                                                               // length 508
-	clientHello[2] = []byte{0x03, 0x03}                                                                                                     // client version
-	clientHello[3] = hd.random                                                                                                              // random
-	clientHello[4] = []byte{0x20}                                                                                                           // session id length 32
-	clientHello[5] = hd.sessionId                                                                                                           // session id
-	clientHello[6] = []byte{0x00, 0x2a}                                                                                                     // cipher suites length 42
-	clientHello[7] = append(makeGREASE(), decodeHex("130113021303c02cc02bcca9c030c02fcca8c00ac009c014c013009d009c0035002fc008c012000a")...) // cipher suites
-	clientHello[8] = []byte{0x01}                                                                                                           // compression methods length 1
-	clientHello[9] = []byte{0x00}                                                                                                           // compression methods
-
-	extensions := s.composeExtensions(hd.serverName, hd.x25519KeyShare)
-	clientHello[10] = []byte{0x00, 0x00}
-	binary.BigEndian.PutUint16(clientHello[10], uint16(len(extensions))) // extension length
-	clientHello[11] = extensions
-
-	var ret []byte
-	for _, c := range clientHello {
-		ret = append(ret, c...)
-	}
-	return ret
-}
--- a/internal/client/safari_test.go
+++ b/internal/client/safari_test.go
@ -1,38 +0,0 @@
-package client
-
-import (
-	"testing"
-)
-
-var safariHd = clientHelloFields{
-	random:         decodeHex("977ecef48c0fc5640fea4dbd638da89704d6d85ed2e81b8913ae5b27f9a5cc17"),
-	sessionId:      decodeHex("c2d5b91e77371bf154363b39194ac77c05617cc6164724d0ba7ded4aa349c6a3"),
-	x25519KeyShare: decodeHex("c99fbe80dda71f6e24d9b798dc3f3f33cef946f0b917fa90154a4b95114fae2a"),
-	serverName:     "github.com",
-}
-
-//func TestSafariJA3(t *testing.T) {
-//	result := common.AddRecordLayer((&Safari{}).composeClientHello(safariHd), common.Handshake, common.VersionTLS11)
-//
-//	hello := tlsx.ClientHelloBasic{}
-//	err := hello.Unmarshal(result)
-//	assert.Nil(t, err)
-//
-//	digest := ja3.DigestHex(&hello)
-//	assert.Equal(t, "773906b0efdefa24a7f2b8eb6985bf37", digest)
-//}
-
-func TestSafariComposeClientHello(t *testing.T) {
-	result := (&Safari{}).composeClientHello(safariHd)
-	target := decodeHex("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")
-	for p := 0; p < len(result); p++ {
-		if result[p] != target[p] {
-			if result[p]&0x0F == 0xA && target[p]&0x0F == 0xA &&
-				((p > 0 && result[p-1] == result[p] && target[p-1] == target[p]) ||
-					(p < len(result)-1 && result[p+1] == result[p] && target[p+1] == target[p])) {
-				continue
-			}
-			t.Errorf("inequality at %v", p)
-		}
-	}
-}
--- a/internal/client/state.go
+++ b/internal/client/state.go
@ -241,13 +241,13 @@ func (raw *RawConfig) ProcessRawConfig(worldState common.WorldState) (local Loca
 		var browser browser
 		switch strings.ToLower(raw.BrowserSig) {
 		case "firefox":
-			browser = &Firefox{}
+			browser = firefox
 		case "safari":
-			browser = &Safari{}
+			browser = safari
 		case "chrome":
 			fallthrough
 		default:
-			browser = &Chrome{}
+			browser = chrome
 		}
 		remote.TransportMaker = func() Transport {
 			return &DirectTLS{