public byte[] ProcessIncoming(byte[] data)
{
return(CryptoHelper.SymmetricDecrypt(data, sessionKey));
}
public byte[] ProcessOutgoing(byte[] ms)
{
return(CryptoHelper.SymmetricEncrypt(ms, sessionKey));
}
public static byte[] GenerateMachineID()
{
// this is steamkit's own implementation, it doesn't match what steamclient does
// but this should make it so individual systems can be identified
PlatformID platform = Environment.OSVersion.Platform;
if (platform == PlatformID.Win32NT)
{
StringBuilder hwString = new StringBuilder();
try
{
using (ManagementClass procClass = new ManagementClass("Win32_Processor"))
{
foreach (var procObj in procClass.GetInstances())
{
hwString.AppendLine(procObj["ProcessorID"].ToString());
}
}
}
catch { }
try
{
using (ManagementClass hdClass = new ManagementClass("Win32_LogicalDisk"))
{
foreach (var hdObj in hdClass.GetInstances())
{
string hdType = hdObj["DriveType"].ToString();
if (hdType != "3")
{
continue; // only want local disks
}
hwString.AppendLine(hdObj["VolumeSerialNumber"].ToString());
}
}
}
catch { }
try
{
using (ManagementClass moboClass = new ManagementClass("Win32_BaseBoard"))
{
foreach (var moboObj in moboClass.GetInstances())
{
hwString.AppendLine(moboObj["SerialNumber"].ToString());
}
}
}
catch { }
try
{
return(CryptoHelper.SHAHash(Encoding.ASCII.GetBytes(hwString.ToString())));
}
catch { return(null); }
}
else
{
// todo: implement me!
return(null);
}
}
byte[] DoRawCommand(Server server, string command, string data = null, string method = WebRequestMethods.Http.Get, bool doAuth = false, string args = "", string authtoken = null)
{
string url = BuildCommand(server, command, args, authtoken);
var webReq = HttpWebRequest.Create(url) as HttpWebRequest;
webReq.Method = method;
webReq.Pipelined = true;
webReq.KeepAlive = true;
if (doAuth && server.Type == "CS")
{
var req = Interlocked.Increment(ref reqCounter);
byte[] shaHash;
using (var ms = new MemoryStream())
using (var bw = new BinaryWriter(ms))
{
var uri = new Uri(url);
bw.Write(sessionId);
bw.Write(req);
bw.Write(sessionKey);
bw.Write(Encoding.UTF8.GetBytes(uri.AbsolutePath));
shaHash = CryptoHelper.SHAHash(ms.ToArray());
}
string hexHash = Utils.EncodeHexString(shaHash);
string authHeader = string.Format("sessionid={0};req-counter={1};hash={2};", sessionId, req, hexHash);
webReq.Headers["x-steam-auth"] = authHeader;
}
if (method == WebRequestMethods.Http.Post)
{
byte[] payload = Encoding.UTF8.GetBytes(data);
webReq.ContentType = "application/x-www-form-urlencoded";
webReq.ContentLength = payload.Length;
using (var reqStream = webReq.GetRequestStream())
{
reqStream.Write(payload, 0, payload.Length);
}
}
var result = webReq.BeginGetResponse(null, null);
if (!result.AsyncWaitHandle.WaitOne(RequestTimeout))
{
webReq.Abort();
}
try
{
var response = webReq.EndGetResponse(result);
using (var ms = new MemoryStream(( int )response.ContentLength))
{
response.GetResponseStream().CopyTo(ms);
response.Close();
return(ms.ToArray());
}
}
catch (Exception ex)
{
DebugLog.WriteLine("CDNClient", "Failed to complete web request to {0}: {1}", url, ex.Message);
throw;
}
}
void HandleEncryptRequest(IPacketMsg packetMsg)
{
var request = new Msg <MsgChannelEncryptRequest>(packetMsg);
var connectedUniverse = request.Body.Universe;
var protoVersion = request.Body.ProtocolVersion;
log.LogDebug(nameof(EnvelopeEncryptedConnection), "Got encryption request. Universe: {0} Protocol ver: {1}", connectedUniverse, protoVersion);
DebugLog.Assert(protoVersion == 1, nameof(EnvelopeEncryptedConnection), "Encryption handshake protocol version mismatch!");
DebugLog.Assert(connectedUniverse == universe, nameof(EnvelopeEncryptedConnection), FormattableString.Invariant($"Expected universe {universe} but server reported universe {connectedUniverse}"));
byte[]? randomChallenge;
if (request.Payload.Length >= 16)
{
randomChallenge = request.Payload.ToArray();
}
else
{
randomChallenge = null;
}
var publicKey = KeyDictionary.GetPublicKey(connectedUniverse);
if (publicKey == null)
{
log.LogDebug(nameof(EnvelopeEncryptedConnection), "HandleEncryptRequest got request for invalid universe! Universe: {0} Protocol ver: {1}", connectedUniverse, protoVersion);
Disconnect(userInitiated: false);
return;
}
var response = new Msg <MsgChannelEncryptResponse>();
var tempSessionKey = CryptoHelper.GenerateRandomBlock(32);
byte[] encryptedHandshakeBlob;
using (var rsa = new RSACrypto(publicKey))
{
if (randomChallenge != null)
{
var blobToEncrypt = new byte[tempSessionKey.Length + randomChallenge.Length];
Array.Copy(tempSessionKey, blobToEncrypt, tempSessionKey.Length);
Array.Copy(randomChallenge, 0, blobToEncrypt, tempSessionKey.Length, randomChallenge.Length);
encryptedHandshakeBlob = rsa.Encrypt(blobToEncrypt);
}
else
{
encryptedHandshakeBlob = rsa.Encrypt(tempSessionKey);
}
}
var keyCrc = CryptoHelper.CRCHash(encryptedHandshakeBlob);
response.Write(encryptedHandshakeBlob);
response.Write(keyCrc);
response.Write(( uint )0);
if (randomChallenge != null)
{
encryption = new NetFilterEncryptionWithHMAC(tempSessionKey, log);
}
else
{
encryption = new NetFilterEncryption(tempSessionKey, log);
}
state = EncryptionState.Challenged;
Send(response.Serialize());
}
void HandleEncryptRequest(IPacketMsg packetMsg)
{
var encRequest = new Msg <MsgChannelEncryptRequest>(packetMsg);
EUniverse eUniv = encRequest.Body.Universe;
uint protoVersion = encRequest.Body.ProtocolVersion;
DebugLog.WriteLine("UFSClient", "Got encryption request. Universe: {0} Protocol ver: {1}", eUniv, protoVersion);
DebugLog.Assert(protoVersion == 1, "UFSClient", "Encryption handshake protocol version mismatch!");
byte[] randomChallenge;
if (encRequest.Payload.Length >= 16)
{
randomChallenge = encRequest.Payload.ToArray();
}
else
{
randomChallenge = null;
}
byte[] pubKey = KeyDictionary.GetPublicKey(eUniv);
if (pubKey == null)
{
connection.Disconnect();
DebugLog.WriteLine("UFSClient", "HandleEncryptionRequest got request for invalid universe! Universe: {0} Protocol ver: {1}", eUniv, protoVersion);
return;
}
ConnectedUniverse = eUniv;
var encResp = new Msg <MsgChannelEncryptResponse>();
var tempSessionKey = CryptoHelper.GenerateRandomBlock(32);
byte[] encryptedHandshakeBlob = null;
using (var rsa = new RSACrypto(pubKey))
{
if (randomChallenge != null)
{
var blobToEncrypt = new byte[tempSessionKey.Length + randomChallenge.Length];
Array.Copy(tempSessionKey, blobToEncrypt, tempSessionKey.Length);
Array.Copy(randomChallenge, 0, blobToEncrypt, tempSessionKey.Length, randomChallenge.Length);
encryptedHandshakeBlob = rsa.Encrypt(blobToEncrypt);
}
else
{
encryptedHandshakeBlob = rsa.Encrypt(tempSessionKey);
}
}
var keyCrc = CryptoHelper.CRCHash(encryptedHandshakeBlob);
encResp.Write(encryptedHandshakeBlob);
encResp.Write(keyCrc);
encResp.Write(( uint )0);
if (randomChallenge != null)
{
pendingNetFilterEncryption = new NetFilterEncryptionWithHMAC(tempSessionKey);
}
else
{
pendingNetFilterEncryption = new NetFilterEncryption(tempSessionKey);
}
this.Send(encResp);
}
public byte[] ProcessOutgoing(byte[] data)
{
return(CryptoHelper.SymmetricEncryptWithHMACIV(data, sessionKey, hmacSecret));
}
