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// **********************************************************************
//
// Copyright (c) 2002
// MutableRealms, Inc.
// Huntsville, AL, USA
//
// All Rights Reserved
//
// **********************************************************************
#include <Ice/Buffer.h>
#include <Ice/SUdpServerControlChannel.h>
#include <Ice/SUdpClient.h>
#include <Ice/Instance.h>
#include <Ice/Communicator.h>
#include <Ice/ObjectAdapter.h>
#include <Ice/IdentityUtil.h>
#include <Ice/SUdpTransceiver.h>
#include <Ice/MessageAuthenticator.h>
#include <Ice/Cryptor.h>
#include <Ice/BasicStream.h>
#include <sstream>
using namespace std;
using namespace Ice;
using namespace IceSecurity::SecureUdp;
using IceInternal::Buffer;
using IceInternal::BasicStream;
void
IceSecurity::SecureUdp::ServerControlChannel::clientHello(const ClientChannelPtr& client,
const ByteSeq& MACkey,
const Current&)
{
IceUtil::Mutex::Lock sync(_mutex);
Long clientID = getNewClientID();
MessageAuthenticatorPtr messageAuthenticator = new MessageAuthenticator(MACkey);
SUdpClientPtr sudpClient = new SUdpClient(clientID, client, messageAuthenticator);
CryptKeyPtr cryptKey = _cryptor->getNewKey();
sudpClient->serverHello(cryptKey);
newSUdpClient(sudpClient);
}
void
IceSecurity::SecureUdp::ServerControlChannel::clientKeyAcknowledge(Long clientID,
Long msgID,
const ByteSeq& key,
const Current&)
{
IceUtil::Mutex::Lock sync(_mutex);
SUdpClientPtr sudpClient = getSUdpClient(clientID);
CryptKeyPtr cryptKey = _cryptor->getKey(key);
sudpClient->setNewCryptKey(msgID, cryptKey);
}
void
IceSecurity::SecureUdp::ServerControlChannel::clientKeyRequest(Long clientID, const Current&)
{
IceUtil::Mutex::Lock sync(_mutex);
SUdpClientPtr sudpClient = getSUdpClient(clientID);
CryptKeyPtr cryptKey = _cryptor->getNewKey();
sudpClient->serverKeyChange(cryptKey);
}
void
IceSecurity::SecureUdp::ServerControlChannel::clientGoodbye(Long clientID, const Current&)
{
IceUtil::Mutex::Lock sync(_mutex);
deleteSUdpClient(clientID);
}
IceSecurity::SecureUdp::ServerControlChannel::ServerControlChannel(const SUdpTransceiverPtr& transceiver,
const InstancePtr& instance,
int port) :
ControlChannel(transceiver, instance)
{
_clientIDGenerator = 0L;
// Create the Server Channel's name
ostringstream objectName;
objectName << "sudpServer" << dec << port;
// This MUST be an SSL endpoint - secure handshake take place over this.
ostringstream endpt;
endpt << "ssl -p " << dec << port;
// Create the ObjectAdapter's name
ostringstream objectAdapterName;
objectAdapterName << "sudpServerControl" << dec << port;
Ice::CommunicatorPtr communicator = _instance->communicator();
// Create our ObjectAdapter
_adapter = communicator->createObjectAdapterWithEndpoints(objectAdapterName.str(), endpt.str());
// The server control channel is the implemenation.
ServerChannelPtr serverChannel = this;
_adapter->add(serverChannel, Ice::stringToIdentity(objectName.str()));
// Okay, allow the object to begin accepting requests
_adapter->activate();
}
IceSecurity::SecureUdp::ServerControlChannel::~ServerControlChannel()
{
// Make it impossible for the control channel to access the Transceiver
// after transceiver destruction.
unsetTransceiver();
}
void
IceSecurity::SecureUdp::ServerControlChannel::decryptPacket(Buffer& encryptedPacket, Buffer& decryptedPacket)
{
IceUtil::Mutex::Lock sync(_mutex);
// Header information at the beginning of the packet.
Byte version;
Long clientID;
Long msgID;
Long length;
// The encrypted message, final portion of the packet.
ByteSeq encryptedMessage;
// 1. Break apart header and encrypted Message
BasicStream sudpPacket(0);
sudpPacket.read(version);
sudpPacket.read(clientID);
sudpPacket.read(msgID);
sudpPacket.read(length);
sudpPacket.read(encryptedMessage);
// TODO: Perform version check here.
// Check to make sure the encrypted message is the correct length
Long messageLength = encryptedMessage.end() - encryptedMessage.begin();
if (messageLength != length)
{
// TODO: Bad scene, this message is not the right length!
}
// 2. Decrypt the Encrypted message
ByteSeq signedMessage;
SUdpClientPtr sudpClient = getSUdpClient(clientID);
CryptKeyPtr cryptKey = sudpClient->getCryptKey(msgID);
_cryptor->decrypt(cryptKey, encryptedMessage, signedMessage);
// 3. Split out the message and MAC code from the signedMessage
// Note: We're reusing the messageLength variable here.
BasicStream signedMessageStream(0);
ByteSeq messageAndMAC;
signedMessageStream.write(signedMessage);
signedMessageStream.read(messageLength);
signedMessageStream.read(messageAndMAC);
ByteSeq::iterator current = messageAndMAC.begin();
ByteSeq::iterator macPos = current + messageLength;
ByteSeq::iterator end = messageAndMAC.end();
ByteSeq message(current, macPos);
ByteSeq macCode(macPos, end);
// 4. Compute MAC and compare
MessageAuthenticatorPtr messageAuthenticator = sudpClient->getMessageAuthenticator();
if (messageAuthenticator->authenticate(message, macCode))
{
// TODO: Bad scene, the MAC codes don't match, this message is invalid!
}
decryptedPacket.b = message;
}
Long
IceSecurity::SecureUdp::ServerControlChannel::getNewClientID()
{
IceUtil::Mutex::Lock sync(_clientIDMutex);
return ++_clientIDGenerator;
}
SUdpClientPtr&
IceSecurity::SecureUdp::ServerControlChannel::getSUdpClient(Long clientID)
{
IceUtil::Mutex::Lock sync(_clientMapMutex);
return _clientMap[clientID];
}
void
IceSecurity::SecureUdp::ServerControlChannel::newSUdpClient(const SUdpClientPtr& sudpClient)
{
IceUtil::Mutex::Lock sync(_clientMapMutex);
pair<Long, SUdpClientPtr> clientPair(sudpClient->getClientID(), sudpClient);
_clientMap.insert(clientPair);
}
void
IceSecurity::SecureUdp::ServerControlChannel::deleteSUdpClient(Long clientID)
{
IceUtil::Mutex::Lock sync(_clientMapMutex);
_clientMap.erase(clientID);
}
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