Adam Van Ymeren
7a04f298d2
- update to latest telegram layer - remove some references to fields in tg.Entities that don't exist in the schema - originally added here: https://github.com/beeper/td/commit/820929062a2ba0104397bc01235ab58a9cff780e - referenced here - https://github.com/mautrix/telegramgo/commit/124f0967ed195b5a380c9bd02e170ada9710dde3 - https://github.com/mautrix/telegramgo/commit/4205047aab2e0639217148b5d125bfaab668bd8e
125 lines
3.0 KiB
Go
125 lines
3.0 KiB
Go
package faketls
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import (
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"crypto/hmac"
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"crypto/sha256"
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"encoding/binary"
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"io"
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"github.com/go-faster/errors"
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"go.mau.fi/mautrix-telegram/pkg/gotd/bin"
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"go.mau.fi/mautrix-telegram/pkg/gotd/clock"
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)
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const clientHelloLength = 517
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func createClientHello(b *bin.Buffer, sessionID [32]byte, domain string, key [32]byte) (randomOffset int) {
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S := func(s string) {
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b.Buf = append(b.Buf, s...)
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}
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Z := func(n int) {
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randomOffset = len(b.Buf)
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b.Expand(n)
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}
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G := func(_ int) {
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b.Expand(0)
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}
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R := func() {
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b.Buf = append(b.Buf, sessionID[:]...)
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}
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D := func() {
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b.Buf = append(b.Buf, domain...)
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}
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K := func() {
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b.Buf = append(b.Buf, key[:]...)
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}
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var stack []int
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Open := func() {
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stack = append(stack, b.Len())
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b.Expand(2)
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}
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Close := func() {
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lastIdx := len(stack) - 1
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s := stack[lastIdx]
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stack = stack[:lastIdx]
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length := b.Len() - (s + 2)
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binary.BigEndian.PutUint16(b.Buf[s:], uint16(length))
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}
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S("\x16\x03\x01\x02\x00\x01\x00\x01\xfc\x03\x03")
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Z(32)
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S("\x20")
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R()
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S("\x00\x20")
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G(0)
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S("\x13\x01\x13\x02\x13\x03\xc0\x2b\xc0\x2f\xc0\x2c\xc0\x30\xcc\xa9" +
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"\xcc\xa8\xc0\x13\xc0\x14\x00\x9c\x00\x9d\x00\x2f\x00\x35\x01\x00" +
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"\x01\x93")
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G(2)
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S("\x00\x00\x00\x00")
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Open()
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Open()
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S("\x00")
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Open()
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D()
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Close()
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Close()
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Close()
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S("\x00\x17\x00\x00\xff\x01\x00\x01\x00\x00\x0a\x00\x0a\x00\x08")
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G(4)
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S("\x00\x1d\x00\x17\x00\x18\x00\x0b\x00\x02\x01\x00\x00\x23\x00\x00" +
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"\x00\x10\x00\x0e\x00\x0c\x02\x68\x32\x08\x68\x74\x74\x70\x2f\x31" +
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"\x2e\x31\x00\x05\x00\x05\x01\x00\x00\x00\x00\x00\x0d\x00\x12\x00" +
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"\x10\x04\x03\x08\x04\x04\x01\x05\x03\x08\x05\x05\x01\x08\x06\x06" +
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"\x01\x00\x12\x00\x00\x00\x33\x00\x2b\x00\x29")
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G(4)
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S("\x00\x01\x00\x00\x1d\x00\x20")
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K()
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S("\x00\x2d\x00\x02\x01\x01\x00\x2b\x00\x0b\x0a")
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G(6)
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S("\x03\x04\x03\x03\x03\x02\x03\x01\x00\x1b\x00\x03\x02\x00\x02")
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G(3)
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S("\x00\x01\x00\x00\x15")
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if pad := clientHelloLength - b.Len(); pad > 0 {
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b.Expand(pad)
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}
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return randomOffset
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}
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// writeClientHello writes faketls ClientHello.
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//
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// See https://tools.ietf.org/html/rfc5246#section-7.4.1.1.
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func writeClientHello(
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w io.Writer,
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now clock.Clock,
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sessionID [32]byte,
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domain string,
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secret []byte,
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) (r [32]byte, err error) {
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b := &bin.Buffer{
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Buf: make([]byte, 0, 576),
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}
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randomOffset := createClientHello(b, sessionID, domain, [32]byte{})
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// https://github.com/tdlib/td/blob/27d3fdd09d90f6b77ecbcce50b1e86dc4b3dd366/td/mtproto/TlsInit.cpp#L380-L384
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mac := hmac.New(sha256.New, secret)
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if _, err := mac.Write(b.Buf); err != nil {
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return [32]byte{}, errors.Wrap(err, "hmac write")
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}
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s := mac.Sum(nil)
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copy(b.Buf[randomOffset:randomOffset+32], s)
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// Overwrite last 4 bytes using final := original ^ timestamp.
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old := binary.LittleEndian.Uint32(b.Buf[randomOffset+28 : randomOffset+32])
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old ^= uint32(now.Now().Unix())
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binary.LittleEndian.PutUint32(b.Buf[randomOffset+28:randomOffset+32], old)
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// Copy ClientRandom for later use.
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copy(r[:], b.Buf[randomOffset:randomOffset+32])
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_, err = w.Write(b.Buf)
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return r, err
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}
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