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74 lines
4.1 KiB
Go
74 lines
4.1 KiB
Go
// Fingerprint of Firefox 112
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package client
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import (
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"encoding/binary"
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"github.com/cbeuw/Cloak/internal/common"
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)
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type Firefox struct{}
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func (f *Firefox) composeExtensions(serverName string, keyShare []byte) []byte {
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composeKeyShare := func(hidden []byte) []byte {
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ret := make([]byte, 107)
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ret[0], ret[1] = 0x00, 0x69 // length 105
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ret[2], ret[3] = 0x00, 0x1d // group x25519
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ret[4], ret[5] = 0x00, 0x20 // length 32
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copy(ret[6:38], hidden)
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ret[38], ret[39] = 0x00, 0x17 // group secp256r1
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ret[40], ret[41] = 0x00, 0x41 // length 65
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common.CryptoRandRead(ret[42:107])
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return ret
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}
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// extension length is always 401, and server name length is variable
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var ext [13][]byte
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ext[0] = addExtRec([]byte{0x00, 0x00}, generateSNI(serverName)) // server name indication
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ext[1] = addExtRec([]byte{0x00, 0x17}, nil) // extended_master_secret
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ext[2] = addExtRec([]byte{0xff, 0x01}, []byte{0x00}) // renegotiation_info
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ext[3] = addExtRec([]byte{0x00, 0x0a}, decodeHex("000c001d00170018001901000101")) // supported groups
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ext[4] = addExtRec([]byte{0x00, 0x0b}, []byte{0x01, 0x00}) // ec point formats
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ext[5] = addExtRec([]byte{0x00, 0x10}, decodeHex("000c02683208687474702f312e31")) // app layer proto negotiation
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ext[6] = addExtRec([]byte{0x00, 0x05}, []byte{0x01, 0x00, 0x00, 0x00, 0x00}) // status request
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ext[7] = addExtRec([]byte{0x00, 0x22}, decodeHex("00080403050306030203")) // delegated credentials
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ext[8] = addExtRec([]byte{0x00, 0x33}, composeKeyShare(keyShare)) // key share
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ext[9] = addExtRec([]byte{0x00, 0x2b}, decodeHex("0403040303")) // supported versions
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ext[10] = addExtRec([]byte{0x00, 0x0d}, decodeHex("001604030503060308040805080604010501060102030201")) // Signature Algorithms
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ext[11] = addExtRec([]byte{0x00, 0x1c}, []byte{0x40, 0x01}) // record size limit
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// len(ext[0]) + len(all other ext) + len(len field of padding) + len(padding) = 401
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// len(all other ext) = 228
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// len(len field of padding) = 4
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// len(padding) = 169 - len(ext[0])
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ext[12] = addExtRec([]byte{0x00, 0x15}, make([]byte, 169-len(ext[0]))) // padding
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var ret []byte
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for _, e := range ext {
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ret = append(ret, e...)
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}
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return ret
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}
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func (f *Firefox) composeClientHello(hd clientHelloFields) (ch []byte) {
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var clientHello [12][]byte
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clientHello[0] = []byte{0x01} // handshake type
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clientHello[1] = []byte{0x00, 0x01, 0xfc} // length 508
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clientHello[2] = []byte{0x03, 0x03} // client version
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clientHello[3] = hd.random // random
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clientHello[4] = []byte{0x20} // session id length 32
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clientHello[5] = hd.sessionId // session id
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clientHello[6] = []byte{0x00, 0x22} // cipher suites length 34
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clientHello[7] = decodeHex("130113031302c02bc02fcca9cca8c02cc030c00ac009c013c014009c009d002f0035") // cipher suites
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clientHello[8] = []byte{0x01} // compression methods length 1
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clientHello[9] = []byte{0x00} // compression methods
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extensions := f.composeExtensions(hd.serverName, hd.x25519KeyShare)
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clientHello[10] = []byte{0x00, 0x00}
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binary.BigEndian.PutUint16(clientHello[10], uint16(len(extensions))) // extension length
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clientHello[11] = extensions
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var ret []byte
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for _, c := range clientHello {
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ret = append(ret, c...)
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}
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return ret
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}
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