/
loginSequence.go
188 lines (146 loc) · 4.89 KB
/
loginSequence.go
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package main
import (
"crypto/aes"
"crypto/rand"
"crypto/sha1"
"encoding/json"
"fmt"
"github.com/google/uuid"
"io/ioutil"
"net/http"
"time"
)
type YggdrasilResponse struct {
Id string `json:"id"`
Name string `json:"name"`
}
func sendLoginSuccess(s *Session, offline bool) {
if offline == true {
theUuid := uuid.New()
s.playerUUIDDashed = theUuid.String()
s.playerUUID = theUuid
} else {
s.playerUUIDDashed = s.playerUUID.String()
}
compressionPacket, _ := writeVarInt(128)
s.sendPacket(0x03, compressionPacket)
s.compressionEnabled = true
s.compressionThreshold = 128
packet, _ := writeString(s.playerUUIDDashed)
usernamePart, _ := writeString(s.playerUsername)
packet = append(packet, usernamePart...)
s.sendPacket(0x02, packet)
// Send join game
joinPacket := []byte{
0, 0, 0, 0, // Player entity ID (always 0)
3, // Gamemode 3
0, 0, 0, 0, // Overworld TODO: Support other dimensions
0, 0, 0, 0, 0, 0, 0, 0, 0, // i have no idea what this is for...
}
levelType, _ := writeString("default")
renderDistance, _ := writeVarInt(config.RadiusToSend)
joinPacket = append(joinPacket, levelType...)
joinPacket = append(joinPacket, renderDistance...)
joinPacket = append(joinPacket, 0, 1)
s.sendPacket(0x26, joinPacket)
// Send server brand
pack1, _ := writeString("minecraft:brand")
pack2, _ := writeString("ScaffoldingMC")
pack1 = append(pack1, pack2...)
s.sendPacket(0x19, pack1)
// TODO: Replace with real code, this is just temporary!!!!!!!!!!!
positionBuffer := float64ToByte(60)
rotBuffer := float32ToByte(60)
posPacket := make([]byte, 0)
posPacket = append(posPacket, positionBuffer...)
positionBuffer = float64ToByte(80)
posPacket = append(posPacket, positionBuffer...)
positionBuffer = float64ToByte(60)
posPacket = append(posPacket, positionBuffer...)
posPacket = append(posPacket, rotBuffer...)
posPacket = append(posPacket, rotBuffer...)
posPacket = append(posPacket, 0, 15)
s.sendPacket(54, posPacket)
s.sendPacket(0x41, []byte{3, 3})
for i := 0; i < 20; i++ {
for j := 0; j < 20; j++ {
s.sendPacket(0x22, chunkCache[578][i][j])
fmt.Println(i, j)
time.Sleep(time.Millisecond * 30)
//s.sendPacket(0x41, []byte{byte(i), byte(j)})
}
}
// fmt.Println(hex.Dump(chunkCache[578][3][3]))
s.sendPacket(0x41, []byte{3, 3})
s.sendPacket(54, posPacket)
s.stage = 3
}
func loginStart(s *Session, packet []byte) {
var ptr = 0
s.playerUsername, ptr = readString(packet, ptr)
if config.OnlineMode == false {
// Offline mode
sendLoginSuccess(s, true)
} else {
s.loginStage = 1
s.encryptionVerifyToken = make([]byte, 4)
rand.Read(s.encryptionVerifyToken)
publicKeyLength, _ := writeVarInt(len(EncodedPublicKey))
verifyTokenLength, _ := writeVarInt(len(s.encryptionVerifyToken))
encryptionRequestPacket := []byte{0}
encryptionRequestPacket = append(encryptionRequestPacket, publicKeyLength...)
encryptionRequestPacket = append(encryptionRequestPacket, EncodedPublicKey...)
encryptionRequestPacket = append(encryptionRequestPacket, verifyTokenLength...)
encryptionRequestPacket = append(encryptionRequestPacket, s.encryptionVerifyToken...)
s.sendPacket(1, encryptionRequestPacket)
}
}
func loginVerify(s *Session, packet []byte) {
var ptr = 0
encryptedSharedSecret, ptr := readByteArray(packet, ptr)
encryptedVerifyToken, ptr := readByteArray(packet, ptr)
decryptedVerifyToken, err := PrivateKey.Decrypt(rand.Reader, encryptedVerifyToken, nil)
if err != nil {
s.disconnect()
}
if string(decryptedVerifyToken) != string(s.encryptionVerifyToken) {
s.disconnect()
}
// Shared secret decryption
decryptedSharedSecret, err := PrivateKey.Decrypt(rand.Reader, encryptedSharedSecret, nil)
// Generate hash to send to yggdrasil
hash := sha1.New()
hash.Write(decryptedSharedSecret)
hash.Write(EncodedPublicKey)
hashSum := hash.Sum(nil)
hashString := string(McHexDigest(hashSum))
// Send request to yggdrasil
resp, _ := http.Get(
"https://sessionserver.mojang.com/session/minecraft/hasJoined?username=" +
s.playerUsername +
"&serverId=" +
hashString)
body, _ := ioutil.ReadAll(resp.Body)
var response YggdrasilResponse
json.Unmarshal(body, &response)
if len(response.Id) < 8 { // Safe to say we have a suspicious one going on.
s.disconnect()
}
// Create encryption instances for both stream ciphers
s.encryptionEnabled = true
encryptionBlock, _ := aes.NewCipher(decryptedSharedSecret)
decryptionBlock, _ := aes.NewCipher(decryptedSharedSecret)
s.clientBoundCryptoStream = NewCFB8(encryptionBlock, decryptedSharedSecret, false)
s.serverBoundCryptoStream = NewCFB8(decryptionBlock, decryptedSharedSecret, true)
s.playerUUID, _ = uuid.Parse(response.Id)
sendLoginSuccess(s, false)
}
func loginHandler(s *Session, packetId int, packet []byte) {
if s.loginStage == 0 && packetId == 0 {
loginStart(s, packet)
} else if s.loginStage == 1 && packetId == 1 {
loginVerify(s, packet)
} else {
s.disconnect()
}
}