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83 lines
3.5 KiB
Go
83 lines
3.5 KiB
Go
// Chrome 64
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package TLS
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import (
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"encoding/hex"
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"math/rand"
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"time"
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"github.com/cbeuw/Cloak/internal/client"
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"github.com/cbeuw/Cloak/internal/util"
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)
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type chrome struct {
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browser
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}
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func (c *chrome) composeExtensions(sta *client.State) []byte {
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// see https://tools.ietf.org/html/draft-davidben-tls-grease-01
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// This is exclusive to chrome.
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makeGREASE := func() []byte {
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rand.Seed(time.Now().UnixNano())
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sixteenth := rand.Intn(16)
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monoGREASE := byte(sixteenth*16 + 0xA)
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doubleGREASE := []byte{monoGREASE, monoGREASE}
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return doubleGREASE
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}
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makeSupportedGroups := func() []byte {
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suppGroupListLen := []byte{0x00, 0x08}
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ret := make([]byte, 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})
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return ret
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}
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var ext [14][]byte
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ext[0] = addExtRec(makeGREASE(), nil) // First GREASE
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ext[1] = addExtRec([]byte{0xff, 0x01}, []byte{0x00}) // renegotiation_info
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ext[2] = addExtRec([]byte{0x00, 0x00}, makeServerName(sta)) // server name indication
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ext[3] = addExtRec([]byte{0x00, 0x17}, nil) // extended_master_secret
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ext[4] = addExtRec([]byte{0x00, 0x23}, client.MakeSessionTicket(sta)) // Session tickets
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sigAlgo, _ := hex.DecodeString("0012040308040401050308050501080606010201")
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ext[5] = addExtRec([]byte{0x00, 0x0d}, sigAlgo) // Signature Algorithms
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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, 0x12}, nil) // signed cert timestamp
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APLN, _ := hex.DecodeString("000c02683208687474702f312e31")
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ext[8] = addExtRec([]byte{0x00, 0x10}, APLN) // app layer proto negotiation
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ext[9] = addExtRec([]byte{0x75, 0x50}, nil) // channel id
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ext[10] = addExtRec([]byte{0x00, 0x0b}, []byte{0x01, 0x00}) // ec point formats
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ext[11] = addExtRec([]byte{0x00, 0x0a}, makeSupportedGroups()) // supported groups
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ext[12] = addExtRec(makeGREASE(), []byte{0x00}) // Last GREASE
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ext[13] = addExtRec([]byte{0x00, 0x15}, makeNullBytes(110-len(ext[2]))) // padding
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var ret []byte
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for i := 0; i < 14; i++ {
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ret = append(ret, ext[i]...)
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}
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return ret
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}
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func (c *chrome) composeClientHello(sta *client.State) []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] = client.MakeRandomField(sta) // random
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clientHello[4] = []byte{0x20} // session id length 32
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clientHello[5] = util.PsudoRandBytes(32, sta.Now().UnixNano()) // session id
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clientHello[6] = []byte{0x00, 0x1c} // cipher suites length 28
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cipherSuites, _ := hex.DecodeString("2a2ac02bc02fc02cc030cca9cca8c013c014009c009d002f0035000a")
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clientHello[7] = cipherSuites // 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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clientHello[10] = []byte{0x01, 0x97} // extensions length 407
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clientHello[11] = c.composeExtensions(sta) // extensions
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var ret []byte
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for i := 0; i < 12; i++ {
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ret = append(ret, clientHello[i]...)
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}
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return ret
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}
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