protected void DecodeCert(McpeLogin message)
{
_playerInfo = new PlayerInfo();
// Get bytes
byte[] buffer = message.payload;
//Log.Debug($"Unknown byte in login packet is: {message.unknown}");
if (message.payload.Length != buffer.Length)
{
Log.Debug($"Wrong lenght {message.payload.Length} != {message.payload.Length}");
throw new Exception($"Wrong lenght {message.payload.Length} != {message.payload.Length}");
}
// Decompress bytes
Log.Debug("Lenght: " + message.payload.Length + ", Message: " + Convert.ToBase64String(buffer));
//MemoryStream stream = new MemoryStream(buffer);
//if (stream.ReadByte() != 0x78)
//{
// throw new InvalidDataException("Incorrect ZLib header. Expected 0x78 0x9C");
//}
//stream.ReadByte();
string certificateChain;
string skinData;
//using (var defStream2 = new DeflateStream(stream, CompressionMode.Decompress, false))
{
// Get actual package out of bytes
//using (MemoryStream destination = MiNetServer.MemoryStreamManager.GetStream())
{
//defStream2.CopyTo(destination);
var destination = new MemoryStream(buffer);
destination.Position = 0;
NbtBinaryReader reader = new NbtBinaryReader(destination, false);
try
{
var countCertData = reader.ReadInt32();
Log.Debug("Count cert: " + countCertData);
certificateChain = Encoding.UTF8.GetString(reader.ReadBytes(countCertData));
Log.Debug("Decompressed certificateChain " + certificateChain);
var countSkinData = reader.ReadInt32();
Log.Debug("Count skin: " + countSkinData);
skinData = Encoding.UTF8.GetString(reader.ReadBytes(countSkinData));
Log.Debug("Decompressed skinData" + skinData);
}
catch (Exception e)
{
Log.Error("Parsing login", e);
return;
}
}
}
try
{
{
if (Log.IsDebugEnabled)
{
Log.Debug("Input SKIN string: " + skinData);
}
IDictionary <string, dynamic> headers = JWT.Headers(skinData);
dynamic payload = JObject.Parse(JWT.Payload(skinData));
if (Log.IsDebugEnabled)
{
Log.Debug($"Skin JWT Header: {string.Join(";", headers)}");
}
if (Log.IsDebugEnabled)
{
Log.Debug($"Skin JWT Payload:\n{payload.ToString()}");
}
// Skin JWT Payload:
//{
// "ADRole": 2,
// "ClientRandomId": -1256727416,
// "CurrentInputMode": 2,
// "DefaultInputMode": 2,
// "DeviceModel": "SAMSUNG GT-P5210",
// "DeviceOS": 1,
// "GameVersion": "1.0.3.0",
// "GuiScale": 0,
// "ServerAddress": "192.168.0.3:19132",
// "SkinData": 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// "SkinId": "Standard_Custom",
// "TenantId": "",
// "UIProfile": 1
//}
try
{
_playerInfo.ADRole = payload.ADRole;
_playerInfo.ClientId = payload.ClientRandomId;
_playerInfo.CurrentInputMode = payload.CurrentInputMode;
_playerInfo.DefaultInputMode = payload.DefaultInputMode;
_playerInfo.DeviceModel = payload.DeviceModel;
_playerInfo.DeviceOS = payload.DeviceOS;
_playerInfo.GameVersion = payload.GameVersion;
_playerInfo.GuiScale = payload.GuiScale;
_playerInfo.ServerAddress = payload.ServerAddress;
_playerInfo.UIProfile = payload.UIProfile;
_playerInfo.Skin = new Skin()
{
SkinType = payload.SkinId,
Texture = Convert.FromBase64String((string)payload.SkinData),
};
}
catch (Exception e)
{
Log.Error("Skin info", e);
}
}
{
if (Log.IsDebugEnabled)
{
Log.Debug("Input JSON string: " + certificateChain);
}
dynamic json = JObject.Parse(certificateChain);
if (Log.IsDebugEnabled)
{
Log.Debug($"JSON:\n{json}");
}
string validationKey = null;
foreach (dynamic o in json.chain)
{
IDictionary <string, dynamic> headers = JWT.Headers(o.ToString());
if (Log.IsDebugEnabled)
{
Log.Debug("Raw chain element:\n" + o.ToString());
Log.Debug($"JWT Header: {string.Join(";", headers)}");
dynamic jsonPayload = JObject.Parse(JWT.Payload(o.ToString()));
Log.Debug($"JWT Payload:\n{jsonPayload}");
}
// x5u cert (string): MHYwEAYHKoZIzj0CAQYFK4EEACIDYgAE8ELkixyLcwlZryUQcu1TvPOmI2B7vX83ndnWRUaXm74wFfa5f/lwQNTfrLVHa2PmenpGI6JhIMUJaWZrjmMj90NoKNFSNBuKdm8rYiXsfaz3K36x/1U26HpG0ZxK/V1V
if (headers.ContainsKey("x5u"))
{
string certString = headers["x5u"];
if (Log.IsDebugEnabled)
{
Log.Debug($"x5u cert (string): {certString}");
ECDiffieHellmanPublicKey publicKey = CryptoUtils.CreateEcDiffieHellmanPublicKey(certString);
Log.Debug($"Cert:\n{publicKey.ToXmlString()}");
}
// Validate
CngKey newKey = CryptoUtils.ImportECDsaCngKeyFromString(certString);
CertificateData data = JWT.Decode <CertificateData>(o.ToString(), newKey);
if (data != null)
{
if (Log.IsDebugEnabled)
{
Log.Debug("Decoded token success");
}
if (CertificateData.MojangRootKey.Equals(certString, StringComparison.InvariantCultureIgnoreCase))
{
Log.Debug("Got Mojang key. Is valid = " + data.CertificateAuthority);
validationKey = data.IdentityPublicKey;
}
else if (validationKey != null && validationKey.Equals(certString, StringComparison.InvariantCultureIgnoreCase))
{
_playerInfo.CertificateData = data;
}
else
{
if (data.ExtraData == null)
{
continue;
}
// Self signed, make sure they don't fake XUID
if (data.ExtraData.Xuid != null)
{
Log.Warn("Received fake XUID from " + data.ExtraData.DisplayName);
data.ExtraData.Xuid = null;
}
_playerInfo.CertificateData = data;
}
}
else
{
Log.Error("Not a valid Identity Public Key for decoding");
}
}
}
//TODO: Implement disconnect here
{
_playerInfo.Username = _playerInfo.CertificateData.ExtraData.DisplayName;
_session.Username = _playerInfo.Username;
string identity = _playerInfo.CertificateData.ExtraData.Identity;
if (Log.IsDebugEnabled)
{
Log.Debug($"Connecting user {_playerInfo.Username} with identity={identity}");
}
_playerInfo.ClientUuid = new UUID(identity);
_session.CryptoContext = new CryptoContext
{
UseEncryption = Config.GetProperty("UseEncryptionForAll", false) || (Config.GetProperty("UseEncryption", true) && !string.IsNullOrWhiteSpace(_playerInfo.CertificateData.ExtraData.Xuid)),
};
if (_session.CryptoContext.UseEncryption)
{
ECDiffieHellmanPublicKey publicKey = CryptoUtils.CreateEcDiffieHellmanPublicKey(_playerInfo.CertificateData.IdentityPublicKey);
if (Log.IsDebugEnabled)
{
Log.Debug($"Cert:\n{publicKey.ToXmlString()}");
}
// Create shared shared secret
ECDiffieHellmanCng ecKey = new ECDiffieHellmanCng(384);
ecKey.HashAlgorithm = CngAlgorithm.Sha256;
ecKey.KeyDerivationFunction = ECDiffieHellmanKeyDerivationFunction.Hash;
ecKey.SecretPrepend = Encoding.UTF8.GetBytes("RANDOM SECRET"); // Server token
byte[] secret = ecKey.DeriveKeyMaterial(publicKey);
if (Log.IsDebugEnabled)
{
Log.Debug($"SECRET KEY (b64):\n{Convert.ToBase64String(secret)}");
}
{
RijndaelManaged rijAlg = new RijndaelManaged
{
BlockSize = 128,
Padding = PaddingMode.None,
Mode = CipherMode.CFB,
FeedbackSize = 8,
Key = secret,
IV = secret.Take(16).ToArray(),
};
// Create a decrytor to perform the stream transform.
ICryptoTransform decryptor = rijAlg.CreateDecryptor(rijAlg.Key, rijAlg.IV);
MemoryStream inputStream = new MemoryStream();
CryptoStream cryptoStreamIn = new CryptoStream(inputStream, decryptor, CryptoStreamMode.Read);
ICryptoTransform encryptor = rijAlg.CreateEncryptor(rijAlg.Key, rijAlg.IV);
MemoryStream outputStream = new MemoryStream();
CryptoStream cryptoStreamOut = new CryptoStream(outputStream, encryptor, CryptoStreamMode.Write);
_session.CryptoContext.Algorithm = rijAlg;
_session.CryptoContext.Decryptor = decryptor;
_session.CryptoContext.Encryptor = encryptor;
_session.CryptoContext.InputStream = inputStream;
_session.CryptoContext.OutputStream = outputStream;
_session.CryptoContext.CryptoStreamIn = cryptoStreamIn;
_session.CryptoContext.CryptoStreamOut = cryptoStreamOut;
}
var response = McpeServerToClientHandshake.CreateObject();
response.NoBatch = true;
response.ForceClear = true;
response.serverPublicKey = Convert.ToBase64String(ecKey.PublicKey.GetDerEncoded());
response.tokenLength = (short)ecKey.SecretPrepend.Length;
response.token = ecKey.SecretPrepend;
_session.SendPackage(response);
if (Log.IsDebugEnabled)
{
Log.Warn($"Encryption enabled for {_session.Username}");
}
}
}
}
if (!_session.CryptoContext.UseEncryption)
{
_session.MessageHandler.HandleMcpeClientToServerHandshake(null);
}
}
catch (Exception e)
{
Log.Error("Decrypt", e);
}
}
protected void DecodeCert(McpeLogin message)
{
// Get bytes
byte[] buffer = message.payload;
//Log.Debug($"Unknown byte in login packet is: {message.unknown}");
if (message.payload.Length != buffer.Length)
{
Log.Debug($"Wrong lenght {message.payload.Length} != {message.payload.Length}");
throw new Exception($"Wrong lenght {message.payload.Length} != {message.payload.Length}");
}
// Decompress bytes
Log.Debug("Lenght: " + message.payload.Length + ", Message: " + Convert.ToBase64String(buffer));
//MemoryStream stream = new MemoryStream(buffer);
//if (stream.ReadByte() != 0x78)
//{
// throw new InvalidDataException("Incorrect ZLib header. Expected 0x78 0x9C");
//}
//stream.ReadByte();
string certificateChain;
string skinData;
//using (var defStream2 = new DeflateStream(stream, CompressionMode.Decompress, false))
{
// Get actual package out of bytes
//using (MemoryStream destination = MiNetServer.MemoryStreamManager.GetStream())
{
//defStream2.CopyTo(destination);
var destination = new MemoryStream(buffer);
destination.Position = 0;
NbtBinaryReader reader = new NbtBinaryReader(destination, false);
try
{
var countCertData = reader.ReadInt32();
Log.Debug("Count cert: " + countCertData);
certificateChain = Encoding.UTF8.GetString(reader.ReadBytes(countCertData));
Log.Debug("Decompressed certificateChain " + certificateChain);
var countSkinData = reader.ReadInt32();
Log.Debug("Count skin: " + countSkinData);
skinData = Encoding.UTF8.GetString(reader.ReadBytes(countSkinData));
Log.Debug("Decompressed skinData" + skinData);
}
catch (Exception e)
{
Log.Error("Parsing login", e);
return;
}
}
}
try
{
{
if (Log.IsDebugEnabled)
{
Log.Debug("Input SKIN string: " + skinData);
}
IDictionary <string, dynamic> headers = JWT.Headers(skinData);
dynamic payload = JObject.Parse(JWT.Payload(skinData));
if (Log.IsDebugEnabled)
{
Log.Debug($"Skin JWT Header: {string.Join(";", headers)}");
}
if (Log.IsDebugEnabled)
{
Log.Debug($"Skin JWT Payload:\n{payload.ToString()}");
}
Console.WriteLine(payload);
// Skin JWT Payload:
//{
// "ClientRandomId": 1423700530444426768,
// "CurrentInputMode": 1,
// "DefaultInputMode": 1,
// "DeviceModel": "ASUSTeK COMPUTER INC. N550JK",
// "DeviceOS": 7,
// "GameVersion": "1.2.0",
// "GuiScale": 0,
// "LanguageCode": "en_US",
// "ServerAddress": "192.168.0.3:19132",
// "SkinData": "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",
// "SkinId": "Standard_Custom",
// "UIProfile": 0
//}
try
{
_playerInfo.ClientId = payload.ClientRandomId;
_playerInfo.CurrentInputMode = payload.CurrentInputMode;
_playerInfo.DefaultInputMode = payload.DefaultInputMode;
_playerInfo.DeviceModel = payload.DeviceModel;
_playerInfo.DeviceOS = payload.DeviceOS;
_playerInfo.GameVersion = payload.GameVersion;
_playerInfo.GuiScale = payload.GuiScale;
_playerInfo.LanguageCode = payload.LanguageCode;
_playerInfo.ServerAddress = payload.ServerAddress;
_playerInfo.UIProfile = payload.UIProfile;
_playerInfo.Skin = new Skin()
{
SkinType = payload.SkinId,
Texture = Convert.FromBase64String((string)payload.SkinData),
GeometryType = (string)payload.SkinGeometryName,
GeometryData = Encoding.ASCII.GetString(Convert.FromBase64String((string)payload.SkinGeometryData))
};
}
catch (Exception e)
{
Log.Error("Skin info", e);
}
}
{
if (Log.IsDebugEnabled)
{
Log.Debug("Input JSON string: " + certificateChain);
}
dynamic json = JObject.Parse(certificateChain);
if (Log.IsDebugEnabled)
{
Log.Debug($"JSON:\n{json}");
}
string validationKey = null;
JArray chain = json.chain;
var chainArray = chain.ToArray();
string identityPublicKey = null;
foreach (dynamic o in chainArray)
{
IDictionary <string, dynamic> headers = JWT.Headers(o.ToString());
if (Log.IsDebugEnabled)
{
Log.Debug("Raw chain element:\n" + o.ToString());
Log.Debug($"JWT Header: {string.Join(";", headers)}");
dynamic jsonPayload = JObject.Parse(JWT.Payload(o.ToString()));
Log.Debug($"JWT Payload:\n{jsonPayload}");
}
// x5u cert (string): MHYwEAYHKoZIzj0CAQYFK4EEACIDYgAE8ELkixyLcwlZryUQcu1TvPOmI2B7vX83ndnWRUaXm74wFfa5f/lwQNTfrLVHa2PmenpGI6JhIMUJaWZrjmMj90NoKNFSNBuKdm8rYiXsfaz3K36x/1U26HpG0ZxK/V1V
if (headers.ContainsKey("x5u"))
{
string certString = headers["x5u"];
if (identityPublicKey == null && CertificateData.MojangRootKey.Equals(certString, StringComparison.InvariantCultureIgnoreCase))
{
Log.Debug("Key is ok, and got Mojang root");
}
else if (identityPublicKey == null)
{
if (chainArray.Length > 1)
{
Log.Debug("Got client cert (client root)");
continue;
}
else if (chainArray.Length == 1)
{
Log.Debug("Selfsigned chain");
}
}
else if (identityPublicKey.Equals(certString))
{
Log.Debug("Derived Key is ok");
}
if (Log.IsDebugEnabled)
{
Log.Debug($"x5u cert (string): {certString}");
ECDiffieHellmanPublicKey publicKey = CryptoUtils.CreateEcDiffieHellmanPublicKey(certString);
Log.Debug($"Cert:\n{publicKey.ToXmlString()}");
}
// Validate
var newKey = CryptoUtils.ImportECDsaCngKeyFromString(certString);
CertificateData data = JWT.Decode <CertificateData>(o.ToString(), newKey);
if (data != null)
{
identityPublicKey = data.IdentityPublicKey;
if (Log.IsDebugEnabled)
{
Log.Debug("Decoded token success");
}
if (CertificateData.MojangRootKey.Equals(certString, StringComparison.InvariantCultureIgnoreCase))
{
Log.Debug("Got Mojang key. Is valid = " + data.CertificateAuthority);
validationKey = data.IdentityPublicKey;
}
else if (validationKey != null && validationKey.Equals(certString, StringComparison.InvariantCultureIgnoreCase))
{
_playerInfo.CertificateData = data;
}
else
{
if (data.ExtraData == null)
{
continue;
}
// Self signed, make sure they don't fake XUID
if (data.ExtraData.Xuid != null)
{
Log.Warn("Received fake XUID from " + data.ExtraData.DisplayName);
data.ExtraData.Xuid = null;
}
_playerInfo.CertificateData = data;
}
}
else
{
Log.Error("Not a valid Identity Public Key for decoding");
}
}
}
//TODO: Implement disconnect here
{
_playerInfo.Username = _playerInfo.CertificateData.ExtraData.DisplayName;
_session.Username = _playerInfo.Username;
string identity = _playerInfo.CertificateData.ExtraData.Identity;
if (Log.IsDebugEnabled)
{
Log.Debug($"Connecting user {_playerInfo.Username} with identity={identity}");
}
_playerInfo.ClientUuid = new UUID(identity);
_session.CryptoContext = new CryptoContext
{
UseEncryption = Config.GetProperty("UseEncryptionForAll", false) || (Config.GetProperty("UseEncryption", true) && !string.IsNullOrWhiteSpace(_playerInfo.CertificateData.ExtraData.Xuid)),
};
if (_session.CryptoContext.UseEncryption)
{
ECDiffieHellmanPublicKey publicKey = CryptoUtils.CreateEcDiffieHellmanPublicKey(_playerInfo.CertificateData.IdentityPublicKey);
if (Log.IsDebugEnabled)
{
Log.Debug($"Cert:\n{publicKey.ToXmlString()}");
}
// Create shared shared secret
ECDiffieHellmanCng ecKey = new ECDiffieHellmanCng(384);
ecKey.HashAlgorithm = CngAlgorithm.Sha256;
ecKey.KeyDerivationFunction = ECDiffieHellmanKeyDerivationFunction.Hash;
ecKey.SecretPrepend = Encoding.UTF8.GetBytes("RANDOM SECRET"); // Server token
byte[] secret = ecKey.DeriveKeyMaterial(publicKey);
if (Log.IsDebugEnabled)
{
Log.Debug($"SECRET KEY (b64):\n{Convert.ToBase64String(secret)}");
}
{
RijndaelManaged rijAlg = new RijndaelManaged
{
BlockSize = 128,
Padding = PaddingMode.None,
Mode = CipherMode.CFB,
FeedbackSize = 8,
Key = secret,
IV = secret.Take(16).ToArray(),
};
// Create a decrytor to perform the stream transform.
ICryptoTransform decryptor = rijAlg.CreateDecryptor(rijAlg.Key, rijAlg.IV);
MemoryStream inputStream = new MemoryStream();
CryptoStream cryptoStreamIn = new CryptoStream(inputStream, decryptor, CryptoStreamMode.Read);
ICryptoTransform encryptor = rijAlg.CreateEncryptor(rijAlg.Key, rijAlg.IV);
MemoryStream outputStream = new MemoryStream();
CryptoStream cryptoStreamOut = new CryptoStream(outputStream, encryptor, CryptoStreamMode.Write);
_session.CryptoContext.Algorithm = rijAlg;
_session.CryptoContext.Decryptor = decryptor;
_session.CryptoContext.Encryptor = encryptor;
_session.CryptoContext.InputStream = inputStream;
_session.CryptoContext.OutputStream = outputStream;
_session.CryptoContext.CryptoStreamIn = cryptoStreamIn;
_session.CryptoContext.CryptoStreamOut = cryptoStreamOut;
}
var response = McpeServerToClientHandshake.CreateObject();
response.NoBatch = true;
response.ForceClear = true;
string b64Key = Convert.ToBase64String(ecKey.PublicKey.GetDerEncoded());
var j = CngKey.Create(CngAlgorithm.ECDiffieHellmanP384, null, new CngKeyCreationParameters()
{
ExportPolicy = CngExportPolicies.AllowPlaintextExport, KeyUsage = CngKeyUsages.AllUsages
});
var jwt = JWT.Encode(new object[] {
new [] { "salt", "sNUMIRcN2BSNRw93P5vGpg==" }
}, j, JwsAlgorithm.ES384, new Dictionary <string, object> {
{ "x5u", b64Key }
});
response.token = jwt;
_session.SendPackage(response);
if (Log.IsDebugEnabled)
{
Log.Warn($"Encryption enabled for {_session.Username}");
}
}
}
}
if (!_session.CryptoContext.UseEncryption)
{
_session.MessageHandler.HandleMcpeClientToServerHandshake(null);
}
}
catch (Exception e)
{
Log.Error("Decrypt", e);
}
}
public void TestCertMangling()
{
string certString = @"MIICSjCCAdECCQDje/no7mXkVzAKBggqhkjOPQQDAjCBjjELMAkGA1UEBhMCVVMx
EzARBgNVBAgMCkNhbGlmb3JuaWExFjAUBgNVBAcMDU1vdW50YWluIFZpZXcxFDAS
BgNVBAoMC0dvb2dsZSwgSW5jMRcwFQYDVQQDDA53d3cuZ29vZ2xlLmNvbTEjMCEG
CSqGSIb3DQEJARYUZ29sYW5nLWRldkBnbWFpbC5jb20wHhcNMTIwNTIxMDYxMDM0
WhcNMjIwNTE5MDYxMDM0WjCBjjELMAkGA1UEBhMCVVMxEzARBgNVBAgMCkNhbGlm
b3JuaWExFjAUBgNVBAcMDU1vdW50YWluIFZpZXcxFDASBgNVBAoMC0dvb2dsZSwg
SW5jMRcwFQYDVQQDDA53d3cuZ29vZ2xlLmNvbTEjMCEGCSqGSIb3DQEJARYUZ29s
YW5nLWRldkBnbWFpbC5jb20wdjAQBgcqhkjOPQIBBgUrgQQAIgNiAARRuzRNIKRK
jIktEmXanNmrTR/q/FaHXLhWRZ6nHWe26Fw7Rsrbk+VjGy4vfWtNn7xSFKrOu5ze
qxKnmE0h5E480MNgrUiRkaGO2GMJJVmxx20aqkXOk59U8yGA4CghE6MwCgYIKoZI
zj0EAwIDZwAwZAIwBZEN8gvmRmfeP/9C1PRLzODIY4JqWub2PLRT4mv9GU+yw3Gr
PU9A3CHMdEcdw/MEAjBBO1lId8KOCh9UZunsSMfqXiVurpzmhWd6VYZ/32G+M+Mh
3yILeYQzllt/g0rKVRk=";
X509Certificate2 c = new X509Certificate2();
c.Import(Convert.FromBase64String(certString));
Assert.AreEqual("[email protected], CN=www.google.com, O=\"Google, Inc\", L=Mountain View, S=California, C=US", c.Issuer);
//Assert.AreEqual("CN=Microsoft Corporate Root CA, O=Microsoft Corporation", c.Subject);
Assert.AreEqual("X509", c.GetFormat());
Assert.AreEqual("1.2.840.10045.2.1", c.GetKeyAlgorithm());
Assert.AreEqual("06052B81040022", c.GetKeyAlgorithmParametersString());
Assert.AreEqual("ECC", c.PublicKey.Oid.FriendlyName);
ECDiffieHellmanPublicKey certKey = CryptoUtils.ImportEccPublicKeyFromCertificate(c);
//Console.WriteLine(certKey.ToXmlString());
// https://blogs.msdn.microsoft.com/shawnfa/2007/01/22/elliptic-curve-diffie-hellman/
// http://stackoverflow.com/questions/11266711/using-cngkey-to-generate-rsa-key-pair-in-pem-dkim-compatible-using-c-simi
{
string input = "eyJhbGciOiJFUzM4NCIsIng1dSI6Ik1IWXdFQVlIS29aSXpqMENBUVlGSzRFRUFDSURZZ0FFN25uWnBDZnhtQ3JTd0RkQnY3ZUJYWE10S2hyb3hPcmlFcjNobU1PSkF1dy9acFFYajFLNUdHdEhTNENwRk50dGQxSllBS1lvSnhZZ2F5a3BpZTBFeUF2M3FpSzZ1dElIMnFuT0F0M1ZOclFZWGZJWkpTL1ZSZTNJbDhQZ3U5Q0IifQo.eyJleHAiOjE0NjQ5ODM4NDUsImV4dHJhRGF0YSI6eyJkaXNwbGF5TmFtZSI6Imd1cnVueCIsImlkZW50aXR5IjoiYWY2ZjdjNWUtZmNlYS0zZTQzLWJmM2EtZTAwNWU0MDBlNTc4In0sImlkZW50aXR5UHVibGljS2V5IjoiTUhZd0VBWUhLb1pJemowQ0FRWUZLNEVFQUNJRFlnQUU3bm5acENmeG1DclN3RGRCdjdlQlhYTXRLaHJveE9yaUVyM2htTU9KQXV3L1pwUVhqMUs1R0d0SFM0Q3BGTnR0ZDFKWUFLWW9KeFlnYXlrcGllMEV5QXYzcWlLNnV0SUgycW5PQXQzVk5yUVlYZklaSlMvVlJlM0lsOFBndTlDQiIsIm5iZiI6MTQ2NDk4Mzg0NH0K.4OrvYYbX09iwOkz-7_N_5yEejuATcUogEbe69fB-kr7r6sH_qSu6bxp9L64SEgABb0rU7tyYCLVnaCSQjd9Dvb34WI9EducgOPJ92qHspcpXr7j716LDfhZE31ksMtWQ";
ECDiffieHellmanPublicKey rootKey = CryptoUtils.CreateEcDiffieHellmanPublicKey("MHYwEAYHKoZIzj0CAQYFK4EEACIDYgAE8ELkixyLcwlZryUQcu1TvPOmI2B7vX83ndnWRUaXm74wFfa5f/lwQNTfrLVHa2PmenpGI6JhIMUJaWZrjmMj90NoKNFSNBuKdm8rYiXsfaz3K36x/1U26HpG0ZxK/V1V");
Console.WriteLine($"Root Public Key:\n{rootKey.ToXmlString()}");
CngKey key = CngKey.Import(rootKey.ToByteArray(), CngKeyBlobFormat.EccPublicBlob);
Console.WriteLine("Key family: " + key.AlgorithmGroup);
// "identityPublicKey": "MHYwEAYHKoZIzj0CAQYFK4EEACIDYgAE7nnZpCfxmCrSwDdBv7eBXXMtKhroxOriEr3hmMOJAuw/ZpQXj1K5GGtHS4CpFNttd1JYAKYoJxYgaykpie0EyAv3qiK6utIH2qnOAt3VNrQYXfIZJS/VRe3Il8Pgu9CB",
var newKey = CryptoUtils.ImportECDsaCngKeyFromString("MHYwEAYHKoZIzj0CAQYFK4EEACIDYgAE7nnZpCfxmCrSwDdBv7eBXXMtKhroxOriEr3hmMOJAuw/ZpQXj1K5GGtHS4CpFNttd1JYAKYoJxYgaykpie0EyAv3qiK6utIH2qnOAt3VNrQYXfIZJS/VRe3Il8Pgu9CB");
string decoded = JWT.Decode(input, newKey);
//Assert.AreEqual("", decoded);
//ECDsaCng t = new ECDsaCng();
//t.HashAlgorithm = CngAlgorithm.ECDiffieHellmanP384;
//t.KeySize = 384;
//byte[] test = t.Key.Export(CngKeyBlobFormat.EccPublicBlob);
//Assert.AreEqual(test, newKey);
//string decoded = JWT.Decode(input, t.Key);
}
// Private key (in reality this is not necessary since we will generate it)
AsymmetricKeyParameter privKey = PrivateKeyFactory.CreateKey(Base64Url.Decode("MB8CAQAwEAYHKoZIzj0CAQYFK4EEACIECDAGAgEBBAEB"));
PrivateKeyInfo privKeyInfo = PrivateKeyInfoFactory.CreatePrivateKeyInfo(privKey);
byte[] derKey = privKeyInfo.GetDerEncoded();
CngKey privCngKey = CngKey.Import(derKey, CngKeyBlobFormat.Pkcs8PrivateBlob);
Console.WriteLine(privKeyInfo.PrivateKeyAlgorithm.Algorithm);
Console.WriteLine(privCngKey.Algorithm.Algorithm);
// Public key
ECDiffieHellmanPublicKey clientKey = CryptoUtils.CreateEcDiffieHellmanPublicKey("MHYwEAYHKoZIzj0CAQYFK4EEACIDYgAEDEKneqEvcqUqqFMM1HM1A4zWjJC+I8Y+aKzG5dl+6wNOHHQ4NmG2PEXRJYhujyodFH+wO0dEr4GM1WoaWog8xsYQ6mQJAC0eVpBM96spUB1eMN56+BwlJ4H3Qx4TAvAs");
// EC key to generate shared secret
ECDiffieHellmanCng ecKey = new ECDiffieHellmanCng(privCngKey);
ecKey.HashAlgorithm = CngAlgorithm.Sha256;
ecKey.KeyDerivationFunction = ECDiffieHellmanKeyDerivationFunction.Hash;
ecKey.SecretPrepend = new byte[128]; // Server token
//ecKey.SecretPrepend = new byte[0]; // Server token
Console.WriteLine(ecKey.HashAlgorithm);
Console.WriteLine(ecKey.KeyExchangeAlgorithm);
byte[] secret = ecKey.DeriveKeyMaterial(clientKey);
Console.WriteLine(Package.HexDump(secret));
Console.WriteLine(Package.HexDump(Base64Url.Decode("ZOBpyzki/M8UZv5tiBih048eYOBVPkQE3r5Fl0gmUP4=")));
Console.WriteLine(Package.HexDump(Base64Url.Decode("DEKneqEvcqUqqFMM1HM1A4zWjJC+I8Y+aKzG5dl+6wNOHHQ4NmG2PEXRJYhujyod")));
//Console.WriteLine(Package.HexDump(Base64Url.Decode("DEKneqEvcqUqqFMM1HM1A4zWjJC+I8Y+aKzG5dl+6wNOHHQ4NmG2PEXRJYhujyod")));
}
protected void DecodeCert(McpeLogin message)
{
byte[] buffer = message.payload;
if (message.payload.Length != buffer.Length)
{
Log.Debug($"Wrong lenght {message.payload.Length} != {message.payload.Length}");
throw new Exception($"Wrong lenght {message.payload.Length} != {message.payload.Length}");
}
if (Log.IsDebugEnabled)
{
Log.Debug("Lenght: " + message.payload.Length + ", Message: " + Convert.ToBase64String(buffer));
}
string certificateChain;
string skinData;
try
{
var destination = new MemoryStream(buffer);
destination.Position = 0;
NbtBinaryReader reader = new NbtBinaryReader(destination, false);
var countCertData = reader.ReadInt32();
certificateChain = Encoding.UTF8.GetString(reader.ReadBytes(countCertData));
if (Log.IsDebugEnabled)
{
Log.Debug($"Certificate Chain (Lenght={countCertData})\n{certificateChain}");
}
var countSkinData = reader.ReadInt32();
skinData = Encoding.UTF8.GetString(reader.ReadBytes(countSkinData));
if (Log.IsDebugEnabled)
{
Log.Debug($"Skin data (Lenght={countSkinData})\n{skinData}");
}
}
catch (Exception e)
{
Log.Error("Parsing login", e);
return;
}
try
{
{
IDictionary <string, dynamic> headers = JWT.Headers(skinData);
dynamic payload = JObject.Parse(JWT.Payload(skinData));
if (Log.IsDebugEnabled)
{
Log.Debug($"Skin JWT Header: {string.Join(";", headers)}");
}
if (Log.IsDebugEnabled)
{
Log.Debug($"Skin JWT Payload:\n{payload.ToString()}");
}
try
{
_playerInfo.ClientId = payload.ClientRandomId;
_playerInfo.CurrentInputMode = payload.CurrentInputMode;
_playerInfo.DefaultInputMode = payload.DefaultInputMode;
_playerInfo.DeviceModel = payload.DeviceModel;
_playerInfo.DeviceOS = payload.DeviceOS;
_playerInfo.GameVersion = payload.GameVersion;
_playerInfo.GuiScale = payload.GuiScale;
_playerInfo.LanguageCode = payload.LanguageCode;
_playerInfo.ServerAddress = payload.ServerAddress;
_playerInfo.UIProfile = payload.UIProfile;
_playerInfo.Skin = new Skin()
{
CapeData = Convert.FromBase64String((string)payload.CapeData),
SkinId = payload.SkinId,
SkinData = Convert.FromBase64String((string)payload.SkinData),
SkinGeometryName = payload.SkinGeometryName,
SkinGeometry = Convert.FromBase64String((string)payload.SkinGeometry),
};
Log.Warn($"Cape data lenght={_playerInfo.Skin.CapeData.Length}");
}
catch (Exception e)
{
Log.Error("Parsing skin data", e);
}
}
{
dynamic json = JObject.Parse(certificateChain);
if (Log.IsDebugEnabled)
{
Log.Debug($"Certificate JSON:\n{json}");
}
JArray chain = json.chain;
//var chainArray = chain.ToArray();
string validationKey = null;
string identityPublicKey = null;
foreach (JToken token in chain)
{
IDictionary <string, dynamic> headers = JWT.Headers(token.ToString());
if (Log.IsDebugEnabled)
{
Log.Debug("Raw chain element:\n" + token.ToString());
Log.Debug($"JWT Header: {string.Join(";", headers)}");
dynamic jsonPayload = JObject.Parse(JWT.Payload(token.ToString()));
Log.Debug($"JWT Payload:\n{jsonPayload}");
}
// Mojang root x5u cert (string): MHYwEAYHKoZIzj0CAQYFK4EEACIDYgAE8ELkixyLcwlZryUQcu1TvPOmI2B7vX83ndnWRUaXm74wFfa5f/lwQNTfrLVHa2PmenpGI6JhIMUJaWZrjmMj90NoKNFSNBuKdm8rYiXsfaz3K36x/1U26HpG0ZxK/V1V
if (!headers.ContainsKey("x5u"))
{
continue;
}
string x5u = headers["x5u"];
if (identityPublicKey == null)
{
if (CertificateData.MojangRootKey.Equals(x5u, StringComparison.InvariantCultureIgnoreCase))
{
Log.Debug("Key is ok, and got Mojang root");
}
else if (chain.Count > 1)
{
Log.Debug("Got client cert (client root)");
continue;
}
else if (chain.Count == 1)
{
Log.Debug("Selfsigned chain");
}
}
else if (identityPublicKey.Equals(x5u))
{
Log.Debug("Derived Key is ok");
}
if (Log.IsDebugEnabled)
{
Log.Debug($"x5u cert (string): {x5u}");
ECDiffieHellmanPublicKey publicKey = CryptoUtils.CreateEcDiffieHellmanPublicKey(x5u);
Log.Debug($"Cert:\n{publicKey.ToXmlString()}");
}
// Validate
CngKey newKey = CryptoUtils.ImportECDsaCngKeyFromString(x5u);
CertificateData data = JWT.Decode <CertificateData>(token.ToString(), newKey);
if (data != null)
{
identityPublicKey = data.IdentityPublicKey;
if (Log.IsDebugEnabled)
{
Log.Debug("Decoded token success");
}
if (CertificateData.MojangRootKey.Equals(x5u, StringComparison.InvariantCultureIgnoreCase))
{
Log.Debug("Got Mojang key. Is valid = " + data.CertificateAuthority);
validationKey = data.IdentityPublicKey;
}
else if (validationKey != null && validationKey.Equals(x5u, StringComparison.InvariantCultureIgnoreCase))
{
_playerInfo.CertificateData = data;
}
else
{
if (data.ExtraData == null)
{
continue;
}
// Self signed, make sure they don't fake XUID
if (data.ExtraData.Xuid != null)
{
Log.Warn("Received fake XUID from " + data.ExtraData.DisplayName);
data.ExtraData.Xuid = null;
}
_playerInfo.CertificateData = data;
}
}
else
{
Log.Error("Not a valid Identity Public Key for decoding");
}
}
//TODO: Implement disconnect here
{
_playerInfo.Username = _playerInfo.CertificateData.ExtraData.DisplayName;
_session.Username = _playerInfo.Username;
string identity = _playerInfo.CertificateData.ExtraData.Identity;
if (Log.IsDebugEnabled)
{
Log.Debug($"Connecting user {_playerInfo.Username} with identity={identity}");
}
_playerInfo.ClientUuid = new UUID(identity);
_session.CryptoContext = new CryptoContext
{
UseEncryption = Config.GetProperty("UseEncryptionForAll", false) || (Config.GetProperty("UseEncryption", true) && !string.IsNullOrWhiteSpace(_playerInfo.CertificateData.ExtraData.Xuid)),
};
if (_session.CryptoContext.UseEncryption)
{
ECDiffieHellmanPublicKey publicKey = CryptoUtils.CreateEcDiffieHellmanPublicKey(_playerInfo.CertificateData.IdentityPublicKey);
if (Log.IsDebugEnabled)
{
Log.Debug($"Cert:\n{publicKey.ToXmlString()}");
}
// Create shared shared secret
ECDiffieHellmanCng ecKey = new ECDiffieHellmanCng(384);
ecKey.HashAlgorithm = CngAlgorithm.Sha256;
ecKey.KeyDerivationFunction = ECDiffieHellmanKeyDerivationFunction.Hash;
ecKey.SecretPrepend = Encoding.UTF8.GetBytes("RANDOM SECRET"); // Server token
byte[] secret = ecKey.DeriveKeyMaterial(publicKey);
if (Log.IsDebugEnabled)
{
Log.Debug($"SECRET KEY (b64):\n{Convert.ToBase64String(secret)}");
}
{
RijndaelManaged rijAlg = new RijndaelManaged
{
BlockSize = 128,
Padding = PaddingMode.None,
Mode = CipherMode.CFB,
FeedbackSize = 8,
Key = secret,
IV = secret.Take(16).ToArray(),
};
// Create a decrytor to perform the stream transform.
ICryptoTransform decryptor = rijAlg.CreateDecryptor(rijAlg.Key, rijAlg.IV);
MemoryStream inputStream = new MemoryStream();
CryptoStream cryptoStreamIn = new CryptoStream(inputStream, decryptor, CryptoStreamMode.Read);
ICryptoTransform encryptor = rijAlg.CreateEncryptor(rijAlg.Key, rijAlg.IV);
MemoryStream outputStream = new MemoryStream();
CryptoStream cryptoStreamOut = new CryptoStream(outputStream, encryptor, CryptoStreamMode.Write);
_session.CryptoContext.Algorithm = rijAlg;
_session.CryptoContext.Decryptor = decryptor;
_session.CryptoContext.Encryptor = encryptor;
_session.CryptoContext.InputStream = inputStream;
_session.CryptoContext.OutputStream = outputStream;
_session.CryptoContext.CryptoStreamIn = cryptoStreamIn;
_session.CryptoContext.CryptoStreamOut = cryptoStreamOut;
}
//TODO: JSON now.
throw new Exception("JSON!!!");
//var response = McpeServerToClientHandshake.CreateObject();
// response.NoBatch = true;
// response.ForceClear = true;
//response.token =
// response.serverPublicKey = Convert.ToBase64String(ecKey.PublicKey.GetDerEncoded());
// response.tokenLength = (short) ecKey.SecretPrepend.Length;
// response.token = ecKey.SecretPrepend;
//_session.SendPackage(response);
if (Log.IsDebugEnabled)
{
Log.Warn($"Encryption enabled for {_session.Username}");
}
}
}
}
if (!_session.CryptoContext.UseEncryption)
{
_session.MessageHandler.HandleMcpeClientToServerHandshake(null);
}
}
catch (Exception e)
{
Log.Error("Decrypt", e);
}
}
#pragma warning disable 0672, SYSLIB0042 // Member overrides an obsolete member, ToXmlString is obsolete.
public override string ToXmlString() => _wrapped.ToXmlString();