From dd7953b45259cd36421e582f6bba1280b4caa9b8 Mon Sep 17 00:00:00 2001
From: Etzelia <etzelia@hotmail.com>
Date: Tue, 10 Aug 2021 00:16:27 -0500
Subject: [PATCH] Initial commit

Signed-off-by: Etzelia <etzelia@hotmail.com>
---
 .gitignore    |   2 +
 LICENSE       |   7 +++
 cfb.go        |  48 ++++++++++++++++
 digest.go     |  46 +++++++++++++++
 encryption.go | 115 +++++++++++++++++++++++++++++++++++++
 favicon.png   | Bin 0 -> 14796 bytes
 go.mod        |  10 ++++
 go.sum        |  25 ++++++++
 main.go       |  43 ++++++++++++++
 ping.go       |  69 ++++++++++++++++++++++
 server.go     | 156 ++++++++++++++++++++++++++++++++++++++++++++++++++
 11 files changed, 521 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 LICENSE
 create mode 100644 cfb.go
 create mode 100644 digest.go
 create mode 100644 encryption.go
 create mode 100644 favicon.png
 create mode 100644 go.mod
 create mode 100644 go.sum
 create mode 100644 main.go
 create mode 100644 ping.go
 create mode 100644 server.go

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..d24e2fa
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+.idea/
+/mcm-register*
\ No newline at end of file
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..82b4eb1
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,7 @@
+Copyright 2020 Etzelia
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
\ No newline at end of file
diff --git a/cfb.go b/cfb.go
new file mode 100644
index 0000000..2919a6e
--- /dev/null
+++ b/cfb.go
@@ -0,0 +1,48 @@
+package main
+
+import "crypto/cipher"
+
+type cfb8 struct {
+	c               cipher.Block
+	blockSize       int
+	iv, ivReal, tmp []byte
+	de              bool
+}
+
+func newCFB8(c cipher.Block, iv []byte, decrypt bool) cipher.Stream {
+	if len(iv) != 16 {
+		panic("bad iv length!")
+	}
+	cp := make([]byte, 256)
+	copy(cp, iv)
+	return &cfb8{
+		c:         c,
+		blockSize: c.BlockSize(),
+		iv:        cp[:16],
+		ivReal:    cp,
+		tmp:       make([]byte, 16),
+		de:        decrypt,
+	}
+}
+
+func (cf *cfb8) XORKeyStream(dst, src []byte) {
+	for i := 0; i < len(src); i++ {
+		val := src[i]
+		cf.c.Encrypt(cf.tmp, cf.iv)
+		val = val ^ cf.tmp[0]
+
+		if cap(cf.iv) >= 17 {
+			cf.iv = cf.iv[1:17]
+		} else {
+			copy(cf.ivReal, cf.iv[1:])
+			cf.iv = cf.ivReal[:16]
+		}
+
+		if cf.de {
+			cf.iv[15] = src[i]
+		} else {
+			cf.iv[15] = val
+		}
+		dst[i] = val
+	}
+}
diff --git a/digest.go b/digest.go
new file mode 100644
index 0000000..ae86a49
--- /dev/null
+++ b/digest.go
@@ -0,0 +1,46 @@
+package main
+
+import (
+	"crypto/sha1"
+	"encoding/hex"
+	"fmt"
+	"strings"
+)
+
+func digest(secret, publicKey []byte) (string, error) {
+	hash, err := func() (hash []byte, err error) {
+		h := sha1.New()
+		_, err = h.Write(secret)
+		if err != nil {
+			return nil, err
+		}
+		_, err = h.Write(publicKey)
+		if err != nil {
+			return nil, err
+		}
+		return h.Sum(nil), nil
+	}()
+	if err != nil {
+		return "", fmt.Errorf("error writing sha1: %v", err)
+	}
+
+	var s strings.Builder
+	if (hash[0] & 0x80) == 0x80 {
+		hash = twosComplement(hash)
+		s.WriteRune('-')
+	}
+	s.WriteString(strings.TrimLeft(hex.EncodeToString(hash), "0"))
+	return s.String(), nil
+}
+
+func twosComplement(p []byte) []byte {
+	carry := true
+	for i := len(p) - 1; i >= 0; i-- {
+		p[i] = ^p[i]
+		if carry {
+			carry = p[i] == 0xff
+			p[i]++
+		}
+	}
+	return p
+}
diff --git a/encryption.go b/encryption.go
new file mode 100644
index 0000000..cd3e3b5
--- /dev/null
+++ b/encryption.go
@@ -0,0 +1,115 @@
+package main
+
+import (
+	"bytes"
+	"crypto/aes"
+	"crypto/cipher"
+	"crypto/rand"
+	"crypto/rsa"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"github.com/Tnze/go-mc/net"
+	pk "github.com/Tnze/go-mc/net/packet"
+	"io"
+	"net/http"
+	"net/url"
+)
+
+var hasJoinedURL = func() *url.URL {
+	u, err := url.Parse("https://sessionserver.mojang.com/session/minecraft/hasJoined")
+	if err != nil {
+		panic(err)
+	}
+	return u
+}()
+
+func (s *Server) encryptionRequest(conn net.Conn) ([]byte, error) {
+	verify := make([]byte, 4)
+	_, _ = rand.Read(verify)
+	return verify, conn.WritePacket(pk.Marshal(0x01,
+		pk.String(""),
+		pk.ByteArray(s.publicKey),
+		pk.ByteArray(verify),
+	))
+}
+
+type profile struct {
+	ID   string `json:"id"`
+	Name string `json:"name"`
+}
+
+func (p *profile) UUID() string {
+	return fmt.Sprintf("%s-%s-%s-%s-%s", p.ID[:8], p.ID[8:12], p.ID[12:16], p.ID[16:20], p.ID[20:32])
+}
+
+func (s *Server) encryptionResponse(conn net.Conn, username string, verify []byte) (*profile, []byte, error) {
+	var (
+		p            pk.Packet
+		sharedSecret pk.ByteArray
+		verifyToken  pk.ByteArray
+	)
+
+	err := conn.ReadPacket(&p)
+	if err != nil {
+		return nil, nil, fmt.Errorf("could not read packet: %w", err)
+	}
+
+	err = p.Scan(&sharedSecret, &verifyToken)
+	if err != nil {
+		return nil, nil, fmt.Errorf("could not scan packet: %w", err)
+	}
+
+	valid, err := s.verify(verifyToken, verify)
+	if err != nil || !valid {
+		return nil, nil, errors.New("could not verify token")
+	}
+
+	secret, err := rsa.DecryptPKCS1v15(rand.Reader, s.privateKey, sharedSecret)
+	if err != nil {
+		return nil, nil, fmt.Errorf("could not decrypt secret: %w", err)
+	}
+
+	serverID, err := digest(secret, s.publicKey)
+	if err != nil {
+		return nil, nil, fmt.Errorf("could not create digest: %w", err)
+	}
+
+	u := *hasJoinedURL
+	q := u.Query()
+	q.Set("username", username)
+	q.Set("serverId", serverID)
+	u.RawQuery = q.Encode()
+
+	res, err := http.Get(u.String())
+	if err != nil {
+		return nil, nil, fmt.Errorf("could not join server API: %w", err)
+	}
+	defer res.Body.Close()
+
+	var player profile
+	if err := json.NewDecoder(res.Body).Decode(&player); err != nil {
+		return nil, nil, fmt.Errorf("could not decode profile: %w", err)
+	}
+
+	return &player, secret, nil
+}
+
+func (s *Server) verify(encryptedVerifyToken, actualVerifyToken []byte) (bool, error) {
+	decryptedVerifyToken, err := rsa.DecryptPKCS1v15(rand.Reader, s.privateKey, encryptedVerifyToken)
+	if err != nil {
+		return false, fmt.Errorf("error decrypting verify token: %v", err)
+	}
+	return bytes.Equal(decryptedVerifyToken, actualVerifyToken), nil
+}
+
+func encryptedConn(conn net.Conn, secret []byte) (io.Writer, error) {
+	block, err := aes.NewCipher(secret)
+	if err != nil {
+		return nil, err
+	}
+	return &cipher.StreamWriter{
+		S: newCFB8(block, secret, false),
+		W: conn,
+	}, nil
+}
diff --git a/favicon.png b/favicon.png
new file mode 100644
index 0000000000000000000000000000000000000000..ce6bdad30a118c5d4b1f9d6f9abc3b39f02fb1c5
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zLMnt0s+bu~wC8x0NqYv~T<#TE&&+7`Oczx@%Y^^T&3X9XU%zd6yeM#!TirZg$Pc|9
zt_|GQEnjiFV9N5@eUpbHQaosCxxZne*J`5C@xV<zUIp`xT(irx-<l?%MXIgT+S#QY
zyU7b3zy7KGCh=N^@A6{Dv}GCl{>y>r)lKxV{5QT}98q8M;xv*SZNm44bWcS}$*)gv
zx0AeLiI8QxpxdhG&323PFigs)ROY3%uSUTOD1X}$-{y5beC&MzeetkVM2byKn{_~|
zqp|<KFfQN|Z?i9dPa~KwY?mh1JpES6a%shTe|mGb<LwIeUELMi-JrpPao!f&>*^a@
z!rH`PqJ*ToU!?V)No4T$>Knrz=8~5iPEW9nghdnfPXNk~wQP4Ojt?)Q3kTZtC*QZY
z9~F1sS2;hV9a9V|JT&+6wf_9YcAr>CejlCXZhTw(_d*!L^|$^<L^}Gh(z{Ux?x%%2
OfSi<)WSRK8fd2!-6H{*h

literal 0
HcmV?d00001

diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..e4bb00a
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,10 @@
+module git.canopymc.net/Etzelia/mcm-register
+
+go 1.16
+
+require (
+	github.com/Tnze/go-mc v1.17.1-0.20210806203433-99081e1b9cfb
+	github.com/google/uuid v1.1.1
+	github.com/peterbourgon/ff/v3 v3.1.0
+	go.jolheiser.com/beaver v1.1.2
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..3b4207c
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,25 @@
+github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/Tnze/go-mc v1.17.1-0.20210806203433-99081e1b9cfb h1:jf5lM8mkIpYLFF2cORRGYVK9Mv/xuomG1hmR0b4EzXU=
+github.com/Tnze/go-mc v1.17.1-0.20210806203433-99081e1b9cfb/go.mod h1:t0AI38F1BEmmy8/uLhr9RCOUeDbBj3oUNQH9akjzMc0=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/google/uuid v1.1.1 h1:Gkbcsh/GbpXz7lPftLA3P6TYMwjCLYm83jiFQZF/3gY=
+github.com/google/uuid v1.1.1/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+github.com/iancoleman/strcase v0.1.3 h1:dJBk1m2/qjL1twPLf68JND55vvivMupZ4wIzE8CTdBw=
+github.com/iancoleman/strcase v0.1.3/go.mod h1:SK73tn/9oHe+/Y0h39VT4UCxmurVJkR5NA7kMEAOgSE=
+github.com/mattn/go-colorable v0.1.8/go.mod h1:u6P/XSegPjTcexA+o6vUJrdnUu04hMope9wVRipJSqc=
+github.com/mattn/go-isatty v0.0.12/go.mod h1:cbi8OIDigv2wuxKPP5vlRcQ1OAZbq2CE4Kysco4FUpU=
+github.com/pelletier/go-toml v1.6.0 h1:aetoXYr0Tv7xRU/V4B4IZJ2QcbtMUFoNb3ORp7TzIK4=
+github.com/pelletier/go-toml v1.6.0/go.mod h1:5N711Q9dKgbdkxHL+MEfF31hpT7l0S0s/t2kKREewys=
+github.com/peterbourgon/ff/v3 v3.1.0 h1:5JAeDK5j/zhKFjyHEZQXwXBoDijERaos10RE+xamOsY=
+github.com/peterbourgon/ff/v3 v3.1.0/go.mod h1:XNJLY8EIl6MjMVjBS4F0+G0LYoAqs0DTa4rmHHukKDE=
+go.jolheiser.com/beaver v1.1.2 h1:X8voMSTy+8QUFzHlvG89EUVZY/xPQe6fQLVjUPjTvWY=
+go.jolheiser.com/beaver v1.1.2/go.mod h1:7X4F5+XOGSC3LejTShoBdqtRCnPWcnRgmYGmG3EKW8g=
+golang.org/x/sys v0.0.0-20190813064441-fde4db37ae7a/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200116001909-b77594299b42/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200223170610-d5e6a3e2c0ae h1:/WDfKMnPU+m5M4xB+6x4kaepxRw6jWvR5iDRdvjHgy8=
+golang.org/x/sys v0.0.0-20200223170610-d5e6a3e2c0ae/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v2 v2.2.4 h1:/eiJrUcujPVeJ3xlSWaiNi3uSVmDGBK1pDHUHAnao1I=
+gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
diff --git a/main.go b/main.go
new file mode 100644
index 0000000..719d446
--- /dev/null
+++ b/main.go
@@ -0,0 +1,43 @@
+package main
+
+import (
+	"flag"
+	"github.com/peterbourgon/ff/v3"
+	"github.com/peterbourgon/ff/v3/fftoml"
+	"go.jolheiser.com/beaver"
+	"net/http"
+	"os"
+	"time"
+)
+
+func main() {
+	fs := flag.NewFlagSet("afk", flag.ExitOnError)
+	portFlag := fs.Int("port", 25565, "Port to listen on")
+	timeoutFlag := fs.Int("timeout", 15, "HTTP timeout")
+	discordFlag := fs.String("discord", "", "Discord invite link")
+	debugFlag := fs.Bool("debug", false, "Debug Logging")
+	if err := ff.Parse(fs, os.Args[1:],
+		ff.WithEnvVarPrefix("MCM_REGISTER"),
+		ff.WithConfigFileFlag("config"),
+		ff.WithAllowMissingConfigFile(true),
+		ff.WithConfigFileParser(fftoml.New().Parse),
+	); err != nil {
+		beaver.Fatal(err)
+		return
+	}
+	if *debugFlag {
+		beaver.Console.Level = beaver.DEBUG
+	}
+
+	http.DefaultClient.Timeout = time.Second * time.Duration(*timeoutFlag)
+
+	server, err := NewServer(*discordFlag)
+	if err != nil {
+		beaver.Error(err)
+		return
+	}
+
+	if err := server.Start(*portFlag); err != nil {
+		beaver.Error(err)
+	}
+}
diff --git a/ping.go b/ping.go
new file mode 100644
index 0000000..65fd791
--- /dev/null
+++ b/ping.go
@@ -0,0 +1,69 @@
+package main
+
+import (
+	"encoding/base64"
+	"encoding/json"
+	"fmt"
+	"github.com/Tnze/go-mc/bot"
+	"github.com/Tnze/go-mc/chat"
+	"github.com/Tnze/go-mc/net"
+	pk "github.com/Tnze/go-mc/net/packet"
+	"github.com/google/uuid"
+	"go.jolheiser.com/beaver"
+)
+
+func (s *Server) acceptListPing(conn net.Conn) {
+	var p pk.Packet
+	for i := 0; i < 2; i++ {
+		err := conn.ReadPacket(&p)
+		if err != nil {
+			return
+		}
+
+		switch p.ID {
+		case 0x00:
+			err = conn.WritePacket(pk.Marshal(0x00, pk.String(listResp())))
+		case 0x01:
+			err = conn.WritePacket(p)
+		}
+		if err != nil {
+			return
+		}
+	}
+}
+
+type player struct {
+	Name string    `json:"name"`
+	ID   uuid.UUID `json:"id"`
+}
+
+// listResp return server status as JSON string
+func listResp() string {
+	var list struct {
+		Version struct {
+			Name     string `json:"name"`
+			Protocol int    `json:"protocol"`
+		} `json:"version"`
+		Players struct {
+			Max    int      `json:"max"`
+			Online int      `json:"online"`
+			Sample []player `json:"sample"`
+		} `json:"players"`
+		Description chat.Message `json:"description"`
+		FavIcon     string       `json:"favicon,omitempty"`
+	}
+
+	list.Version.Name = "Register Server"
+	list.Version.Protocol = bot.ProtocolVersion
+	list.Players.Max = 0
+	list.Players.Online = 0
+	list.Players.Sample = []player{}
+	list.Description = chat.Message{Text: "Login to register!"}
+	list.FavIcon = fmt.Sprintf("data:image/png;base64,%s", base64.StdEncoding.EncodeToString(favicon))
+
+	data, err := json.Marshal(list)
+	if err != nil {
+		beaver.Errorf("could not marshal JSON: %v", err)
+	}
+	return string(data)
+}
diff --git a/server.go b/server.go
new file mode 100644
index 0000000..b7768cb
--- /dev/null
+++ b/server.go
@@ -0,0 +1,156 @@
+package main
+
+import (
+	"crypto/rand"
+	"crypto/rsa"
+	"crypto/x509"
+	_ "embed"
+	"fmt"
+	"github.com/Tnze/go-mc/chat"
+	"github.com/Tnze/go-mc/net"
+	pk "github.com/Tnze/go-mc/net/packet"
+	"github.com/google/uuid"
+	"go.jolheiser.com/beaver"
+)
+
+//go:embed favicon.png
+var favicon []byte
+
+type Server struct {
+	privateKey    *rsa.PrivateKey
+	publicKey     []byte
+	discordInvite string
+}
+
+func NewServer(discordInvite string) (*Server, error) {
+	private, err := rsa.GenerateKey(rand.Reader, 1024)
+	if err != nil {
+		return nil, fmt.Errorf("error generate private key: %v", err)
+	}
+
+	public, err := x509.MarshalPKIXPublicKey(private.Public())
+	if err != nil {
+		return nil, fmt.Errorf("error form public key to PKIX, ASN.1 DER: %v", err)
+	}
+
+	private.Precompute()
+
+	return &Server{
+		privateKey:    private,
+		publicKey:     public,
+		discordInvite: discordInvite,
+	}, nil
+}
+
+func (s *Server) Start(port int) error {
+	beaver.Infof("Listening on http://localhost:%d", port)
+	l, err := net.ListenMC(fmt.Sprintf(":%d", port))
+	if err != nil {
+		return fmt.Errorf("listen error: %v", err)
+	}
+
+	for {
+		conn, err := l.Accept()
+		if err != nil {
+			beaver.Errorf("Accept error: %v", err)
+		}
+		go s.acceptConn(conn)
+	}
+}
+
+func (s *Server) acceptConn(conn net.Conn) {
+	defer conn.Close()
+	// handshake
+	_, intention, err := s.handshake(conn)
+	if err != nil {
+		beaver.Errorf("Handshake error: %v", err)
+		return
+	}
+
+	switch intention {
+	default:
+		beaver.Errorf("Unknown handshake intention: %v", intention)
+	case 1:
+		s.acceptListPing(conn)
+	case 2:
+		s.handlePlaying(conn)
+	}
+}
+
+func (s *Server) handlePlaying(conn net.Conn) {
+	info, err := s.acceptLogin(conn)
+	if err != nil {
+		beaver.Errorf("login failed: %v", err)
+		return
+	}
+
+	verify, err := s.encryptionRequest(conn)
+	if err != nil {
+		beaver.Errorf("could not send encryption request: %v", err)
+		return
+	}
+
+	profile, secret, err := s.encryptionResponse(conn, info.Name, verify)
+	if err != nil {
+		beaver.Errorf("could not get encryption response: %v", err)
+		return
+	}
+
+	// TODO Register
+
+	econn, err := encryptedConn(conn, secret)
+	if err != nil {
+		beaver.Errorf("could not create encrypted connection: %v", err)
+		return
+	}
+
+	msg := fmt.Sprintf("Thanks for registering, %s!", profile.Name)
+	if s.discordInvite != "" {
+		msg += fmt.Sprintf("\n\nJoin the Discord\n%s", s.discordInvite)
+	}
+	packet := pk.Marshal(0x00,
+		chat.Message{Text: msg},
+	)
+	if err := packet.Pack(econn, 0); err != nil {
+		beaver.Errorf("could not disconnect player: %v", err)
+	}
+}
+
+type PlayerInfo struct {
+	Name    string
+	UUID    uuid.UUID
+	OPLevel int
+}
+
+// acceptLogin check player's account
+func (s *Server) acceptLogin(conn net.Conn) (info PlayerInfo, err error) {
+	//login start
+	var p pk.Packet
+	err = conn.ReadPacket(&p)
+	if err != nil {
+		return
+	}
+
+	err = p.Scan((*pk.String)(&info.Name)) //decode username as pk.String
+	if err != nil {
+		return
+	}
+
+	return
+}
+
+// handshake receive and parse Handshake packet
+func (s *Server) handshake(conn net.Conn) (protocol, intention int32, err error) {
+	var (
+		p                   pk.Packet
+		Protocol, Intention pk.VarInt
+		ServerAddress       pk.String        // ignored
+		ServerPort          pk.UnsignedShort // ignored
+	)
+	// receive handshake packet
+	if err = conn.ReadPacket(&p); err != nil {
+		return
+	}
+	err = p.Scan(&Protocol, &ServerAddress, &ServerPort, &Intention)
+	return int32(Protocol), int32(Intention), err
+}