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89 lines
5.0 KiB
Go
89 lines
5.0 KiB
Go
// Fingerprint of Safari 16.4
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package client
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import (
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"encoding/binary"
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)
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type Safari struct{}
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func (s *Safari) composeExtensions(serverName string, keyShare []byte) []byte {
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makeSupportedGroups := func() []byte {
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suppGroupListLen := []byte{0x00, 0x0a}
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ret := make([]byte, 2+2+8)
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copy(ret[0:2], suppGroupListLen)
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copy(ret[2:4], makeGREASE())
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copy(ret[4:], []byte{0x00, 0x1d, 0x00, 0x17, 0x00, 0x18, 0x00, 0x19})
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return ret
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}
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makeKeyShare := func(hidden []byte) []byte {
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ret := make([]byte, 43)
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ret[0], ret[1] = 0x00, 0x29 // length 41
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copy(ret[2:4], makeGREASE())
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ret[4], ret[5] = 0x00, 0x01 // length 1
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ret[6] = 0x00
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ret[7], ret[8] = 0x00, 0x1d // group x25519
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ret[9], ret[10] = 0x00, 0x20 // length 32
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copy(ret[11:43], hidden)
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return ret
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}
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// extension length is always 393, and server name length is variable
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var ext [16][]byte
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ext[0] = addExtRec(makeGREASE(), nil) // First GREASE
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ext[1] = addExtRec([]byte{0x00, 0x00}, generateSNI(serverName)) // server name indication
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ext[2] = addExtRec([]byte{0x00, 0x17}, nil) // extended_master_secret
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ext[3] = addExtRec([]byte{0xff, 0x01}, []byte{0x00}) // renegotiation_info
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ext[4] = addExtRec([]byte{0x00, 0x0a}, makeSupportedGroups()) // supported groups
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ext[5] = addExtRec([]byte{0x00, 0x0b}, []byte{0x01, 0x00}) // ec point formats
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ext[6] = addExtRec([]byte{0x00, 0x10}, decodeHex("000c02683208687474702f312e31")) // app layer proto negotiation
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ext[7] = addExtRec([]byte{0x00, 0x05}, []byte{0x01, 0x00, 0x00, 0x00, 0x00}) // status request
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ext[8] = addExtRec([]byte{0x00, 0x0d}, decodeHex("001604030804040105030203080508050501080606010201")) // Signature Algorithms
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ext[9] = addExtRec([]byte{0x00, 0x12}, nil) // signed cert timestamp
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ext[10] = addExtRec([]byte{0x00, 0x33}, makeKeyShare(keyShare)) // key share
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ext[11] = addExtRec([]byte{0x00, 0x2d}, []byte{0x01, 0x01}) // psk key exchange modes
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suppVersions := decodeHex("0a5a5a0304030303020301") // 5a5a needs to be a GREASE
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copy(suppVersions[1:3], makeGREASE())
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ext[12] = addExtRec([]byte{0x00, 0x2b}, suppVersions) // supported versions
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ext[13] = addExtRec([]byte{0x00, 0x1b}, []byte{0x02, 0x00, 0x01}) // compress certificate
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ext[14] = addExtRec(makeGREASE(), []byte{0x00}) // Last GREASE
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// len(ext[1]) + len(all other ext) + len(ext[15]) = 393
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// len(all other ext) = 174
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// len(ext[15]) = 219 - len(ext[1])
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// 2+2+len(padding) = 219 - len(ext[1])
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// len(padding) = 215 - len(ext[1])
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ext[15] = addExtRec([]byte{0x00, 0x15}, make([]byte, 215-len(ext[1]))) // 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 (s *Safari) 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, 0x2a} // cipher suites length 42
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clientHello[7] = append(makeGREASE(), decodeHex("130113021303c02cc02bcca9c030c02fcca8c00ac009c014c013009d009c0035002fc008c012000a")...) // 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 := s.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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