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package zmq.io.mechanism.curve;
import static zmq.io.Metadata.IDENTITY;
import static zmq.io.Metadata.SOCKET_TYPE;
import java.nio.ByteBuffer;
import zmq.Msg;
import zmq.Options;
import zmq.ZError;
import zmq.ZMQ;
import zmq.io.SessionBase;
import zmq.io.mechanism.Mechanism;
import zmq.util.Errno;
import zmq.util.Wire;
public class CurveClientMechanism extends Mechanism
{
private enum State
{
SEND_HELLO,
EXPECT_WELCOME,
SEND_INITIATE,
EXPECT_READY,
ERROR_RECEIVED,
CONNECTED
}
private State state;
// Our public key (C)
private final byte[] publicKey;
// Our secret key (c)
private final byte[] secretKey;
// Our short-term public key (C')
private final byte[] cnPublic;
// Our short-term secret key (c')
private final byte[] cnSecret;
// Server's public key (S)
private final byte[] serverKey;
// Server's short-term public key (S')
private final byte[] cnServer = new byte[Curve.Size.PUBLICKEY.bytes()];
// Cookie received from server
private final byte[] cnCookie = new byte[16 + 80];
// Intermediary buffer used to speed up boxing and unboxing.
private final byte[] cnPrecom = new byte[Curve.Size.BEFORENM.bytes()];
private long cnNonce;
private long cnPeerNonce;
private final Curve cryptoBox;
private final Errno errno;
public CurveClientMechanism(SessionBase session, Options options)
{
super(session, null, options);
this.state = State.SEND_HELLO;
cnNonce = 1;
cnPeerNonce = 1;
publicKey = options.curvePublicKey;
assert (publicKey != null && publicKey.length == Curve.Size.PUBLICKEY.bytes());
secretKey = options.curveSecretKey;
assert (secretKey != null && secretKey.length == Curve.Size.SECRETKEY.bytes());
serverKey = options.curveServerKey;
assert (serverKey != null && serverKey.length == Curve.Size.PUBLICKEY.bytes());
cryptoBox = new Curve();
// Generate short-term key pair
byte[][] keys = cryptoBox.keypair();
assert (keys != null && keys.length == 2);
cnPublic = keys[0];
assert (cnPublic != null && cnPublic.length == Curve.Size.PUBLICKEY.bytes());
cnSecret = keys[1];
assert (cnSecret != null && cnSecret.length == Curve.Size.SECRETKEY.bytes());
errno = options.errno;
}
@Override
public int nextHandshakeCommand(Msg msg)
{
int rc;
switch (state) {
case SEND_HELLO:
rc = produceHello(msg);
if (rc == 0) {
state = State.EXPECT_WELCOME;
}
break;
case SEND_INITIATE:
rc = produceInitiate(msg);
if (rc == 0) {
state = State.EXPECT_READY;
}
break;
default:
rc = ZError.EAGAIN;
break;
}
return rc;
}
@Override
public int processHandshakeCommand(Msg msg)
{
int rc;
int dataSize = msg.size();
if (dataSize >= 8 && compare(msg, "WELCOME", true)) {
rc = processWelcome(msg);
}
else if (dataSize >= 6 && compare(msg, "READY", true)) {
rc = processReady(msg);
}
else if (dataSize >= 6 && compare(msg, "ERROR", true)) {
rc = processError(msg);
}
else {
session.getSocket().eventHandshakeFailedProtocol(session.getEndpoint(), ZMQ.ZMQ_PROTOCOL_ERROR_ZMTP_UNEXPECTED_COMMAND);
rc = ZError.EPROTO;
}
return rc;
}
@Override
public Msg encode(Msg msg)
{
assert (state == State.CONNECTED);
byte flags = 0;
if (msg.hasMore()) {
flags |= 0x01;
}
if (msg.isCommand()) {
flags |= 0x02;
}
ByteBuffer messageNonce = ByteBuffer.allocate(Curve.Size.NONCE.bytes());
messageNonce.put("CurveZMQMESSAGEC".getBytes(ZMQ.CHARSET));
Wire.putUInt64(messageNonce, cnNonce);
int mlen = Curve.Size.ZERO.bytes() + 1 + msg.size();
ByteBuffer messagePlaintext = ByteBuffer.allocate(mlen);
messagePlaintext.put(Curve.Size.ZERO.bytes(), flags);
messagePlaintext.position(Curve.Size.ZERO.bytes() + 1);
msg.transfer(messagePlaintext, 0, msg.size());
ByteBuffer messageBox = ByteBuffer.allocate(mlen);
int rc = cryptoBox.afternm(messageBox, messagePlaintext, mlen, messageNonce, cnPrecom);
assert (rc == 0);
Msg encoded = new Msg(16 + mlen - Curve.Size.BOXZERO.bytes());
encoded.putShortString("MESSAGE");
encoded.put(messageNonce, 16, 8);
encoded.put(messageBox, Curve.Size.BOXZERO.bytes(), mlen - Curve.Size.BOXZERO.bytes());
cnNonce++;
return encoded;
}
@Override
public Msg decode(Msg msg)
{
assert (state == State.CONNECTED);
if (!compare(msg, "MESSAGE", true)) {
session.getSocket().eventHandshakeFailedProtocol(session.getEndpoint(), ZMQ.ZMQ_PROTOCOL_ERROR_ZMTP_UNEXPECTED_COMMAND);
errno.set(ZError.EPROTO);
return null;
}
if (msg.size() < 33) {
session.getSocket().eventHandshakeFailedProtocol(session.getEndpoint(), ZMQ.ZMQ_PROTOCOL_ERROR_ZMTP_MALFORMED_COMMAND_MESSAGE);
errno.set(ZError.EPROTO);
return null;
}
ByteBuffer messageNonce = ByteBuffer.allocate(Curve.Size.NONCE.bytes());
messageNonce.put("CurveZMQMESSAGES".getBytes(ZMQ.CHARSET));
msg.transfer(messageNonce, 8, 8);
long nonce = msg.getLong(8);
if (nonce <= cnPeerNonce) {
session.getSocket().eventHandshakeFailedProtocol(session.getEndpoint(), ZMQ.ZMQ_PROTOCOL_ERROR_ZMTP_CRYPTOGRAPHIC);
errno.set(ZError.EPROTO);
return null;
}
cnPeerNonce = nonce;
int clen = Curve.Size.BOXZERO.bytes() + msg.size() - 16;
ByteBuffer messagePlaintext = ByteBuffer.allocate(clen);
ByteBuffer messageBox = ByteBuffer.allocate(clen);
messageBox.position(Curve.Size.BOXZERO.bytes());
msg.transfer(messageBox, 16, msg.size() - 16);
int rc = cryptoBox.openAfternm(messagePlaintext, messageBox, clen, messageNonce, cnPrecom);
if (rc == 0) {
Msg decoded = new Msg(clen - 1 - Curve.Size.ZERO.bytes());
byte flags = messagePlaintext.get(Curve.Size.ZERO.bytes());
if ((flags & 0x01) != 0) {
decoded.setFlags(Msg.MORE);
}
if ((flags & 0x02) != 0) {
decoded.setFlags(Msg.COMMAND);
}
messagePlaintext.position(Curve.Size.ZERO.bytes() + 1);
decoded.put(messagePlaintext);
return decoded;
}
else {
session.getSocket().eventHandshakeFailedProtocol(session.getEndpoint(), ZMQ.ZMQ_PROTOCOL_ERROR_ZMTP_CRYPTOGRAPHIC);
errno.set(ZError.EPROTO);
return null;
}
}
@Override
public Status status()
{
if (state == State.CONNECTED) {
return Status.READY;
}
else if (state == State.ERROR_RECEIVED) {
return Status.ERROR;
}
else {
return Status.HANDSHAKING;
}
}
@Override
public int zapMsgAvailable()
{
return 0;
}
private int produceHello(Msg msg)
{
ByteBuffer helloNonce = ByteBuffer.allocate(Curve.Size.NONCE.bytes());
ByteBuffer helloPlaintext = ByteBuffer.allocate(Curve.Size.ZERO.bytes() + 64);
ByteBuffer helloBox = ByteBuffer.allocate(Curve.Size.BOXZERO.bytes() + 80);
// Prepare the full nonce
helloNonce.put("CurveZMQHELLO---".getBytes(ZMQ.CHARSET));
Wire.putUInt64(helloNonce, cnNonce);
// Create Box [64 * %x0](C'->S)
int rc = cryptoBox.box(helloBox, helloPlaintext, helloPlaintext.capacity(), helloNonce, serverKey, cnSecret);
if (rc != 0) {
session.getSocket().eventHandshakeFailedProtocol(session.getEndpoint(), ZMQ.ZMQ_PROTOCOL_ERROR_ZMTP_CRYPTOGRAPHIC);
return -1;
}
msg.putShortString("HELLO");
// CurveZMQ major and minor version numbers
msg.put(1);
msg.put(0);
// Anti-amplification padding
msg.put(new byte[72]);
// Client public connection key
msg.put(cnPublic);
// Short nonce, prefixed by "CurveZMQHELLO---"
msg.put(helloNonce, 16, 8);
// Signature, Box [64 * %x0](C'->S)
msg.put(helloBox, Curve.Size.BOXZERO.bytes(), 80);
assert (msg.size() == 200);
cnNonce++;
return 0;
}
private int processWelcome(Msg msg)
{
if (msg.size() != 168) {
session.getSocket().eventHandshakeFailedProtocol(session.getEndpoint(), ZMQ.ZMQ_PROTOCOL_ERROR_ZMTP_MALFORMED_COMMAND_READY);
return ZError.EPROTO;
}
ByteBuffer welcomeNonce = ByteBuffer.allocate(Curve.Size.NONCE.bytes());
ByteBuffer welcomePlaintext = ByteBuffer.allocate(Curve.Size.ZERO.bytes() + 128);
ByteBuffer welcomeBox = ByteBuffer.allocate(Curve.Size.BOXZERO.bytes() + 144);
// Open Box [S' + cookie](C'->S)
welcomeBox.position(Curve.Size.BOXZERO.bytes());
msg.transfer(welcomeBox, 24, 144);
welcomeNonce.put("WELCOME-".getBytes(ZMQ.CHARSET));
msg.transfer(welcomeNonce, 8, 16);
int rc = cryptoBox.open(welcomePlaintext, welcomeBox, welcomeBox.capacity(), welcomeNonce, serverKey, cnSecret);
if (rc != 0) {
session.getSocket().eventHandshakeFailedProtocol(session.getEndpoint(), ZMQ.ZMQ_PROTOCOL_ERROR_ZMTP_CRYPTOGRAPHIC);
return ZError.EPROTO;
}
welcomePlaintext.position(Curve.Size.ZERO.bytes());
welcomePlaintext.get(cnServer);
welcomePlaintext.get(cnCookie);
// Message independent precomputation
rc = cryptoBox.beforenm(cnPrecom, cnServer, cnSecret);
assert (rc == 0);
state = State.SEND_INITIATE;
return 0;
}
private int produceInitiate(Msg msg)
{
ByteBuffer vouchNonce = ByteBuffer.allocate(Curve.Size.NONCE.bytes());
ByteBuffer vouchPlaintext = ByteBuffer.allocate(Curve.Size.ZERO.bytes() + 64);
ByteBuffer vouchBox = ByteBuffer.allocate(Curve.Size.BOXZERO.bytes() + 80);
// Create vouch = Box [C',S](C->S')
vouchPlaintext.position(Curve.Size.ZERO.bytes());
vouchPlaintext.put(cnPublic);
vouchPlaintext.put(serverKey);
vouchNonce.put("VOUCH---".getBytes(ZMQ.CHARSET));
vouchNonce.put(cryptoBox.random(16));
int rc = cryptoBox.box(vouchBox, vouchPlaintext, vouchPlaintext.capacity(), vouchNonce, cnServer, secretKey);
if (rc == -1) {
session.getSocket().eventHandshakeFailedProtocol(session.getEndpoint(), ZMQ.ZMQ_PROTOCOL_ERROR_ZMTP_CRYPTOGRAPHIC);
return -1;
}
// Assume here that metadata is limited to 256 bytes
ByteBuffer initiateNonce = ByteBuffer.allocate(Curve.Size.NONCE.bytes());
ByteBuffer initiatePlaintext = ByteBuffer.allocate(Curve.Size.ZERO.bytes() + 128 + 256);
ByteBuffer initiateBox = ByteBuffer.allocate(Curve.Size.BOXZERO.bytes() + 144 + 256);
// Create Box [C + vouch + metadata](C'->S')
initiatePlaintext.position(Curve.Size.ZERO.bytes());
initiatePlaintext.put(publicKey);
vouchNonce.limit(16 + 8).position(8);
initiatePlaintext.put(vouchNonce);
vouchBox.limit(Curve.Size.BOXZERO.bytes() + 80).position(Curve.Size.BOXZERO.bytes());
initiatePlaintext.put(vouchBox);
// Metadata starts after vouch
// Add socket type property
String socketType = socketType();
addProperty(initiatePlaintext, SOCKET_TYPE, socketType);
// Add identity property
if (options.type == ZMQ.ZMQ_REQ || options.type == ZMQ.ZMQ_DEALER || options.type == ZMQ.ZMQ_ROUTER) {
addProperty(initiatePlaintext, IDENTITY, options.identity);
}
int mlen = initiatePlaintext.position();
initiateNonce.put("CurveZMQINITIATE".getBytes(ZMQ.CHARSET));
Wire.putUInt64(initiateNonce, cnNonce);
rc = cryptoBox.box(initiateBox, initiatePlaintext, mlen, initiateNonce, cnServer, cnSecret);
if (rc == -1) {
session.getSocket().eventHandshakeFailedProtocol(session.getEndpoint(), ZMQ.ZMQ_PROTOCOL_ERROR_ZMTP_CRYPTOGRAPHIC);
return -1;
}
msg.putShortString("INITIATE");
// Cookie provided by the server in the WELCOME command
msg.put(cnCookie);
// Short nonce, prefixed by "CurveZMQINITIATE"
msg.put(initiateNonce, 16, 8);
// Box [C + vouch + metadata](C'->S')
msg.put(initiateBox, Curve.Size.BOXZERO.bytes(), mlen - Curve.Size.BOXZERO.bytes());
assert (msg.size() == 113 + mlen - Curve.Size.BOXZERO.bytes());
cnNonce++;
return 0;
}
private int processReady(Msg msg)
{
if (msg.size() < 30) {
session.getSocket().eventHandshakeFailedProtocol(session.getEndpoint(), ZMQ.ZMQ_PROTOCOL_ERROR_ZMTP_MALFORMED_COMMAND_READY);
return ZError.EPROTO;
}
int clen = Curve.Size.BOXZERO.bytes() + msg.size() - 14;
ByteBuffer readyNonce = ByteBuffer.allocate(Curve.Size.NONCE.bytes());
ByteBuffer readyPlaintext = ByteBuffer.allocate(Curve.Size.ZERO.bytes() + 256);
ByteBuffer readyBox = ByteBuffer.allocate(Curve.Size.BOXZERO.bytes() + 16 + 256);
readyBox.position(Curve.Size.BOXZERO.bytes());
msg.transfer(readyBox, 14, clen - Curve.Size.BOXZERO.bytes());
readyNonce.put("CurveZMQREADY---".getBytes(ZMQ.CHARSET));
msg.transfer(readyNonce, 6, 8);
cnPeerNonce = msg.getLong(6);
int rc = cryptoBox.openAfternm(readyPlaintext, readyBox, clen, readyNonce, cnPrecom);
if (rc != 0) {
session.getSocket().eventHandshakeFailedProtocol(session.getEndpoint(), ZMQ.ZMQ_PROTOCOL_ERROR_ZMTP_CRYPTOGRAPHIC);
return ZError.EPROTO;
}
readyPlaintext.limit(clen);
rc = parseMetadata(readyPlaintext, Curve.Size.ZERO.bytes(), false);
if (rc == 0) {
state = State.CONNECTED;
}
return rc;
}
private int processError(Msg msg)
{
if (state != State.EXPECT_WELCOME && state != State.EXPECT_READY) {
session.getSocket().eventHandshakeFailedProtocol(session.getEndpoint(), ZMQ.ZMQ_PROTOCOL_ERROR_ZMTP_UNEXPECTED_COMMAND);
return ZError.EPROTO;
}
state = State.ERROR_RECEIVED;
return parseErrorMessage(msg);
}
}
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