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Merge pull request #186 from HirbodBehnam/master
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Update browser fingerprints
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@cbeuw
cbeuw authored Mar 31, 2022
2 parents 68f47f1 + 9614fbc commit e305871
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Showing 4 changed files with 32 additions and 26 deletions.
20 changes: 11 additions & 9 deletions internal/client/chrome.go
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
// Fingerprint of Chrome 97
// Fingerprint of Chrome 99

package client

Expand Down Expand Up @@ -46,7 +46,7 @@ func (c *Chrome) composeExtensions(serverName string, keyShare []byte) []byte {

// extension length is always 403, and server name length is variable

var ext [17][]byte
var ext [18][]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
Expand All @@ -62,16 +62,18 @@ func (c *Chrome) composeExtensions(serverName string, keyShare []byte) []byte {
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, _ := hex.DecodeString("0a9A9A0304030303020301") // 9A9A needs to be a GREASE
suppVersions, _ := hex.DecodeString("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(makeGREASE(), []byte{0x00}) // Last GREASE
// len(ext[1]) + 170 + len(ext[16]) = 403
// len(ext[16]) = 233 - len(ext[1])
// 2+2+len(padding) = 233 - len(ext[1])
// len(padding) = 229 - len(ext[1])
ext[16] = addExtRec([]byte{0x00, 0x15}, make([]byte, 229-len(ext[1]))) // padding
applicationSettings, _ := hex.DecodeString("0003026832")
ext[15] = addExtRec([]byte{0x44, 0x69}, applicationSettings) // application settings
ext[16] = addExtRec(makeGREASE(), []byte{0x00}) // Last GREASE
// len(ext[1]) + 175 + len(ext[16]) = 403
// len(ext[16]) = 228 - len(ext[1])
// 2+2+len(padding) = 228 - len(ext[1])
// len(padding) = 224 - len(ext[1])
ext[17] = addExtRec([]byte{0x00, 0x15}, make([]byte, 224-len(ext[1]))) // padding
var ret []byte
for _, e := range ext {
ret = append(ret, e...)
Expand Down
2 changes: 1 addition & 1 deletion internal/client/chrome_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -31,7 +31,7 @@ func TestComposeExtension(t *testing.T) {
keyShare, _ := hex.DecodeString("690f074f5c01756982269b66d58c90c47dc0f281d654c7b2c16f63c9033f5604")

result := (&Chrome{}).composeExtensions(serverName, keyShare)
target, _ := hex.DecodeString("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")
target, _ := hex.DecodeString("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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 &&
Expand Down
32 changes: 18 additions & 14 deletions internal/client/firefox.go
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
// Fingerprint of Firefox 96
// Fingerprint of Firefox 99

package client

Expand All @@ -22,26 +22,30 @@ func (f *Firefox) composeExtensions(serverName string, keyShare []byte) []byte {
common.CryptoRandRead(ret[42:107])
return ret
}
// extension length is always 399, and server name length is variable
var ext [12][]byte
// extension length is always 401, and server name length is variable
var ext [15][]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
suppGroup, _ := hex.DecodeString("000c001d00170018001901000101")
ext[3] = addExtRec([]byte{0x00, 0x0a}, suppGroup) // supported groups
ext[4] = addExtRec([]byte{0x00, 0x0b}, []byte{0x01, 0x00}) // ec point formats
ext[5] = addExtRec([]byte{0x00, 0x23}, nil) // session ticket
ALPN, _ := hex.DecodeString("000c02683208687474702f312e31")
ext[5] = addExtRec([]byte{0x00, 0x10}, ALPN) // app layer proto negotiation
ext[6] = addExtRec([]byte{0x00, 0x05}, []byte{0x01, 0x00, 0x00, 0x00, 0x00}) // status request
ext[7] = addExtRec([]byte{0x00, 0x33}, composeKeyShare(keyShare)) // key share
suppVersions, _ := hex.DecodeString("080304030303020301")
ext[8] = addExtRec([]byte{0x00, 0x2b}, suppVersions) // supported versions
ext[6] = addExtRec([]byte{0x00, 0x10}, ALPN) // app layer proto negotiation
ext[7] = addExtRec([]byte{0x00, 0x05}, []byte{0x01, 0x00, 0x00, 0x00, 0x00}) // status request
delegatedCredentials, _ := hex.DecodeString("00080403050306030203")
ext[8] = addExtRec([]byte{0x00, 0x22}, delegatedCredentials) // delegated credentials
ext[9] = addExtRec([]byte{0x00, 0x33}, composeKeyShare(keyShare)) // key share
suppVersions, _ := hex.DecodeString("0403040303")
ext[10] = addExtRec([]byte{0x00, 0x2b}, suppVersions) // supported versions
sigAlgo, _ := hex.DecodeString("001604030503060308040805080604010501060102030201")
ext[9] = addExtRec([]byte{0x00, 0x0d}, sigAlgo) // Signature Algorithms
ext[10] = addExtRec([]byte{0x00, 0x1c}, []byte{0x40, 0x01}) // record size limit
// len(ext[0]) + 218 + 4 + len(padding) = 399
ext[11] = addExtRec([]byte{0x00, 0x0d}, sigAlgo) // Signature Algorithms
ext[12] = addExtRec([]byte{0x00, 0x2d}, []byte{0x01, 0x01}) // psk key exchange modes
ext[13] = addExtRec([]byte{0x00, 0x1c}, []byte{0x40, 0x01}) // record size limit
// len(ext[0]) + 238 + 4 + len(padding) = 401
// len(padding) = 177 - len(ext[0])
ext[11] = addExtRec([]byte{0x00, 0x15}, make([]byte, 177-len(ext[0]))) // padding
ext[14] = addExtRec([]byte{0x00, 0x15}, make([]byte, 159-len(ext[0]))) // padding
var ret []byte
for _, e := range ext {
ret = append(ret, e...)
Expand All @@ -57,8 +61,8 @@ func (f *Firefox) composeClientHello(hd clientHelloFields) (ch []byte) {
clientHello[3] = hd.random // random
clientHello[4] = []byte{0x20} // session id length 32
clientHello[5] = hd.sessionId // session id
clientHello[6] = []byte{0x00, 0x24} // cipher suites length 36
cipherSuites, _ := hex.DecodeString("130113031302c02bc02fcca9cca8c02cc030c00ac009c013c014009c009d002f0035000a")
clientHello[6] = []byte{0x00, 0x22} // cipher suites length 34
cipherSuites, _ := hex.DecodeString("130113031302c02bc02fcca9cca8c02cc030c00ac009c013c014009c009d002f0035")
clientHello[7] = cipherSuites // cipher suites
clientHello[8] = []byte{0x01} // compression methods length 1
clientHello[9] = []byte{0x00} // compression methods
Expand Down
4 changes: 2 additions & 2 deletions internal/client/firefox_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -7,14 +7,14 @@ import (
)

func TestComposeExtensions(t *testing.T) {
target, _ := hex.DecodeString("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")
target, _ := hex.DecodeString("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")

serverName := "consent.google.com"
keyShare, _ := hex.DecodeString("8d8ea1b80430b7710b65f0d89b0144a5eeb218709ce6613d4fc8bfb117657c15")

result := (&Firefox{}).composeExtensions(serverName, keyShare)
// skip random secp256r1
if !bytes.Equal(result[:133], target[:133]) || !bytes.Equal(result[198:], target[198:]) {
if !bytes.Equal(result[:151], target[:151]) || !bytes.Equal(result[216:], target[216:]) {
t.Errorf("got %x", result)
}
}

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