mirror of https://github.com/cbeuw/Cloak
You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
76 lines
3.2 KiB
Go
76 lines
3.2 KiB
Go
// Fingerprint of Firefox 88
|
|
|
|
package client
|
|
|
|
import (
|
|
"encoding/binary"
|
|
"encoding/hex"
|
|
"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 399, and server name length is variable
|
|
var ext [12][]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
|
|
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
|
|
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
|
|
// len(padding) = 177 - len(ext[0])
|
|
ext[11] = addExtRec([]byte{0x00, 0x15}, make([]byte, 177-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, 0x24} // cipher suites length 36
|
|
cipherSuites, _ := hex.DecodeString("130113031302c02bc02fcca9cca8c02cc030c00ac009c013c014009c009d002f0035000a")
|
|
clientHello[7] = cipherSuites // cipher suites
|
|
clientHello[8] = []byte{0x01} // compression methods length 1
|
|
clientHello[9] = []byte{0x00} // compression methods
|
|
|
|
clientHello[11] = f.composeExtensions(hd.serverName, hd.x25519KeyShare)
|
|
clientHello[10] = []byte{0x00, 0x00} // extensions length
|
|
binary.BigEndian.PutUint16(clientHello[10], uint16(len(clientHello[11])))
|
|
|
|
var ret []byte
|
|
for _, c := range clientHello {
|
|
ret = append(ret, c...)
|
|
}
|
|
return ret
|
|
}
|