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SMB2 protocol library for communication with Windows servers
/*
* Copyright (C)2016 - SMBJ Contributors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.hierynomus.smbj.connection;
import com.hierynomus.mserref.NtStatus;
import com.hierynomus.mssmb.SMB1MessageConverter;
import com.hierynomus.mssmb.SMB1NotSupportedException;
import com.hierynomus.mssmb.SMB1Packet;
import com.hierynomus.mssmb.messages.SMB1ComNegotiateRequest;
import com.hierynomus.mssmb2.*;
import com.hierynomus.mssmb2.messages.*;
import com.hierynomus.protocol.commons.Factory;
import com.hierynomus.protocol.commons.buffer.Buffer;
import com.hierynomus.protocol.commons.concurrent.CancellableFuture;
import com.hierynomus.protocol.commons.concurrent.Futures;
import com.hierynomus.protocol.transport.*;
import com.hierynomus.smb.SMBPacket;
import com.hierynomus.smbj.SMBClient;
import com.hierynomus.smbj.SmbConfig;
import com.hierynomus.smbj.auth.AuthenticationContext;
import com.hierynomus.smbj.auth.Authenticator;
import com.hierynomus.smbj.common.SMBRuntimeException;
import com.hierynomus.smbj.event.ConnectionClosed;
import com.hierynomus.smbj.event.SMBEventBus;
import com.hierynomus.smbj.event.SessionLoggedOff;
import com.hierynomus.smbj.session.Session;
import com.hierynomus.spnego.NegTokenInit;
import com.hierynomus.spnego.SpnegoException;
import net.engio.mbassy.listener.Handler;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.util.ArrayList;
import java.util.EnumSet;
import java.util.List;
import java.util.UUID;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.ReentrantLock;
import static com.hierynomus.mssmb2.SMB2Packet.SINGLE_CREDIT_PAYLOAD_SIZE;
import static com.hierynomus.mssmb2.messages.SMB2SessionSetup.SMB2SecurityMode.SMB2_NEGOTIATE_SIGNING_ENABLED;
import static java.lang.String.format;
/**
* A connection to a server.
*/
public class Connection implements AutoCloseable, PacketReceiver> {
private static final Logger logger = LoggerFactory.getLogger(Connection.class);
private static final DelegatingSMBMessageConverter converter = new DelegatingSMBMessageConverter(new SMB2MessageConverter(), new SMB1MessageConverter());
private ConnectionInfo connectionInfo;
private String remoteName;
private SMBClient client;
public SMBClient getClient() {
return client;
}
private SmbConfig config;
private TransportLayer> transport;
private final SMBEventBus bus;
private final ReentrantLock lock = new ReentrantLock();
private int remotePort;
public Connection(SmbConfig config, SMBClient client, SMBEventBus bus) {
this.config = config;
this.client = client;
this.transport = config.getTransportLayerFactory().createTransportLayer(new PacketHandlers<>(new SMBPacketSerializer(), this, converter), config);
this.bus = bus;
bus.subscribe(this);
}
public Connection(Connection connection) {
this.client = connection.client;
this.config = connection.config;
this.transport = connection.transport;
this.bus = connection.bus;
bus.subscribe(this);
}
public void connect(String hostname, int port) throws IOException {
if (isConnected()) {
throw new IllegalStateException(format("This connection is already connected to %s", getRemoteHostname()));
}
this.remoteName = hostname;
this.remotePort = port;
transport.connect(new InetSocketAddress(hostname, port));
this.connectionInfo = new ConnectionInfo(config.getClientGuid(), hostname);
negotiateDialect();
logger.info("Successfully connected to: {}", getRemoteHostname());
}
@Override
public void close() throws Exception {
close(false);
}
/**
* Close the Connection. If {@code force} is set to true, it forgoes the {@link Session#close()} operation on the open sessions, and it just
* calls the {@link TransportLayer#disconnect()}.
*
* @param force if set, does not nicely terminate the open sessions.
* @throws Exception If any error occurred during close-ing.
*/
public void close(boolean force) throws Exception {
try {
if (!force) {
for (Session session : connectionInfo.getSessionTable().activeSessions()) {
try {
session.close();
} catch (IOException e) {
logger.warn("Exception while closing session {}", session.getSessionId(), e);
}
}
}
} finally {
transport.disconnect();
logger.info("Closed connection to {}", getRemoteHostname());
bus.publish(new ConnectionClosed(remoteName, remotePort));
}
}
public SmbConfig getConfig() {
return config;
}
/**
* Authenticate the user on this connection in order to start a (new) session.
*
* @return a (new) Session that is authenticated for the user.
*/
public Session authenticate(AuthenticationContext authContext) {
try {
Authenticator authenticator = getAuthenticator(authContext);
authenticator.init(config.getSecurityProvider(), config.getRandomProvider());
Session session = getSession(authContext);
SMB2SessionSetup receive = authenticationRound(authenticator, authContext, connectionInfo.getGssNegotiateToken(), session);
long sessionId = receive.getHeader().getSessionId();
session.init(receive);
connectionInfo.getPreauthSessionTable().registerSession(sessionId, session);
try {
while (receive.getHeader().getStatus() == NtStatus.STATUS_MORE_PROCESSING_REQUIRED) {
logger.debug("More processing required for authentication of {} using {}", authContext.getUsername(), authenticator);
receive = authenticationRound(authenticator, authContext, receive.getSecurityBuffer(), session);
}
if (receive.getHeader().getStatus() != NtStatus.STATUS_SUCCESS) {
throw new SMBApiException(receive.getHeader(), format("Authentication failed for '%s' using %s", authContext.getUsername(), authenticator));
}
if (receive.getSecurityBuffer() != null) {
// process the last received buffer
authenticator.authenticate(authContext, receive.getSecurityBuffer(), session);
}
logger.info("Successfully authenticated {} on {}, session is {}", authContext.getUsername(), remoteName, session.getSessionId());
connectionInfo.getSessionTable().registerSession(session.getSessionId(), session);
return session;
} finally {
connectionInfo.getPreauthSessionTable().sessionClosed(sessionId);
}
} catch (SpnegoException | IOException e) {
throw new SMBRuntimeException(e);
}
}
private Session getSession(AuthenticationContext authContext) {
return new Session(this, authContext, bus, connectionInfo.isServerRequiresSigning(), config.isDfsEnabled(), config.getSecurityProvider());
}
private SMB2SessionSetup authenticationRound(Authenticator authenticator, AuthenticationContext authContext, byte[] inputToken, Session session) throws IOException {
byte[] securityContext = authenticator.authenticate(authContext, inputToken, session);
SMB2SessionSetup req = new SMB2SessionSetup(connectionInfo.getNegotiatedProtocol().getDialect(), EnumSet.of(SMB2_NEGOTIATE_SIGNING_ENABLED),
connectionInfo.getClientCapabilities());
req.setSecurityBuffer(securityContext);
req.getHeader().setSessionId(session.getSessionId());
return Futures.get(this.send(req), getConfig().getTransactTimeout(), TimeUnit.MILLISECONDS, TransportException.Wrapper);
}
private Authenticator getAuthenticator(AuthenticationContext context) throws IOException, SpnegoException {
List> supportedAuthenticators = new ArrayList<>(config.getSupportedAuthenticators());
List mechTypes = new ArrayList<>();
if (connectionInfo.getGssNegotiateToken().length > 0) {
NegTokenInit negTokenInit = new NegTokenInit().read(connectionInfo.getGssNegotiateToken());
mechTypes = negTokenInit.getSupportedMechTypes();
}
for (Factory.Named factory : new ArrayList<>(supportedAuthenticators)) {
if (mechTypes.isEmpty() || mechTypes.contains(new ASN1ObjectIdentifier(factory.getName()))) {
Authenticator authenticator = factory.create();
if (authenticator.supports(context)) {
return authenticator;
}
}
}
throw new SMBRuntimeException("Could not find a configured authenticator for mechtypes: " + mechTypes + " and authentication context: " + context);
}
/**
* send a packet.
*
* @param packet SMBPacket to send
* @return a Future to be used to retrieve the response packet
* @throws TransportException When a transport level error occurred
*/
public Future send(SMB2Packet packet) throws TransportException {
lock.lock();
try {
int availableCredits = connectionInfo.getSequenceWindow().available();
int grantCredits = calculateGrantedCredits(packet, availableCredits);
if (availableCredits == 0) {
logger.warn("There are no credits left to send {}, will block until there are more credits available.", packet.getHeader().getMessage());
}
long[] messageIds = connectionInfo.getSequenceWindow().get(grantCredits);
packet.getHeader().setMessageId(messageIds[0]);
logger.debug("Granted {} (out of {}) credits to {}", grantCredits, availableCredits, packet);
packet.getHeader().setCreditRequest(Math.max(SequenceWindow.PREFERRED_MINIMUM_CREDITS - availableCredits - grantCredits, grantCredits));
Request request = new Request(packet.getHeader().getMessageId(), UUID.randomUUID());
connectionInfo.getOutstandingRequests().registerOutstanding(request);
transport.write(packet);
return request.getFuture(new CancelRequest(request));
} finally {
lock.unlock();
}
}
private T sendAndReceive(SMB2Packet packet) throws TransportException {
return Futures.get(this.send(packet), getConfig().getTransactTimeout(), TimeUnit.MILLISECONDS, TransportException.Wrapper);
}
private int calculateGrantedCredits(final SMB2Packet packet, final int availableCredits) {
final int grantCredits;
int maxPayloadSize = packet.getMaxPayloadSize();
int creditsNeeded = creditsNeeded(maxPayloadSize);
if (creditsNeeded > 1 && !connectionInfo.supports(SMB2GlobalCapability.SMB2_GLOBAL_CAP_LARGE_MTU)) {
logger.trace("Connection to {} does not support multi-credit requests.", getRemoteHostname());
grantCredits = 1;
} else if (creditsNeeded < availableCredits) { // Scale the credits dynamically
grantCredits = creditsNeeded;
} else if (creditsNeeded > 1 && availableCredits > 1) { // creditsNeeded >= availableCredits
grantCredits = availableCredits - 1; // Keep 1 credit left for a simple request
} else {
grantCredits = 1;
}
packet.setCreditsAssigned(grantCredits);
return grantCredits;
}
private void negotiateDialect() throws TransportException {
logger.debug("Negotiating dialects {} with server {}", config.getSupportedDialects(), getRemoteHostname());
SMB2Packet resp;
if (config.isUseMultiProtocolNegotiate()) {
resp = multiProtocolNegotiate();
} else {
resp = smb2OnlyNegotiate();
}
if (!(resp instanceof SMB2NegotiateResponse)) {
throw new IllegalStateException("Expected a SMB2 NEGOTIATE Response, but got: " + resp);
}
SMB2NegotiateResponse negotiateResponse = (SMB2NegotiateResponse) resp;
if (!negotiateResponse.getHeader().getStatus().isSuccess()) {
throw new SMBApiException(negotiateResponse.getHeader(), "Failure during dialect negotiation");
}
connectionInfo.negotiated(negotiateResponse);
logger.debug("Negotiated the following connection settings: {}", connectionInfo);
}
private SMB2Packet smb2OnlyNegotiate() throws TransportException {
SMB2Packet negotiatePacket = new SMB2NegotiateRequest(config.getSupportedDialects(), connectionInfo.getClientGuid(), config.isSigningRequired());
Future send = send(negotiatePacket);
return Futures.get(send, getConfig().getTransactTimeout(), TimeUnit.MILLISECONDS, TransportException.Wrapper);
}
private SMB2Packet multiProtocolNegotiate() throws TransportException {
SMB1Packet negotiatePacket = new SMB1ComNegotiateRequest(config.getSupportedDialects());
long l = connectionInfo.getSequenceWindow().get();
if (l != 0) {
throw new IllegalStateException("The SMBv1 SMB_COM_NEGOTIATE packet needs to be the first packet sent.");
}
Request request = new Request(l, UUID.randomUUID());
connectionInfo.getOutstandingRequests().registerOutstanding(request);
transport.write(negotiatePacket);
Future future = request.getFuture(null);
SMB2Packet packet = Futures.get(future, getConfig().getTransactTimeout(), TimeUnit.MILLISECONDS, TransportException.Wrapper);
if (!(packet instanceof SMB2NegotiateResponse)) {
throw new IllegalStateException("Expected a SMB2 NEGOTIATE Response to our SMB_COM_NEGOTIATE, but got: " + packet);
}
SMB2NegotiateResponse negotiateResponse = (SMB2NegotiateResponse) packet;
if (negotiateResponse.getDialect() == SMB2Dialect.SMB_2XX) {
return smb2OnlyNegotiate();
}
return negotiateResponse;
}
/**
* [MS-SMB2].pdf 3.1.5.2 Calculating the CreditCharge
*/
private int creditsNeeded(int payloadSize) {
return Math.abs((payloadSize - 1) / SINGLE_CREDIT_PAYLOAD_SIZE) + 1;
}
/**
* Returns the negotiated protocol details for this connection.
*
* @return The negotiated protocol details
*/
public NegotiatedProtocol getNegotiatedProtocol() {
return connectionInfo.getNegotiatedProtocol();
}
@Override
public void handle(SMBPacket uncheckedPacket) throws TransportException {
if (!(uncheckedPacket instanceof SMB2Packet)) {
throw new SMB1NotSupportedException();
}
SMB2Packet packet = (SMB2Packet) uncheckedPacket;
long messageId = packet.getSequenceNumber();
if (!connectionInfo.getOutstandingRequests().isOutstanding(messageId)) {
throw new TransportException("Received response with unknown sequence number <<" + messageId + ">>");
}
// [MS-SMB2].pdf 3.2.5.1.4 Granting Message Credits
connectionInfo.getSequenceWindow().creditsGranted(packet.getHeader().getCreditResponse());
logger.debug("Server granted us {} credits for {}, now available: {} credits", packet.getHeader().getCreditResponse(), packet, connectionInfo.getSequenceWindow().available());
Request request = connectionInfo.getOutstandingRequests().getRequestByMessageId(messageId);
logger.trace("Send/Recv of packet {} took << {} ms >>", packet, System.currentTimeMillis() - request.getTimestamp().getTime());
// [MS-SMB2].pdf 3.2.5.1.5 Handling Asynchronous Responses
if (packet.isIntermediateAsyncResponse()) {
logger.debug("Received ASYNC packet {} with AsyncId << {} >>", packet, packet.getHeader().getAsyncId());
request.setAsyncId(packet.getHeader().getAsyncId());
// TODO Expiration timer
return;
}
// [MS-SMB2].pdf 3.2.5.1.6 Handling Session Expiration
if (packet.getHeader().getStatus() == NtStatus.STATUS_NETWORK_SESSION_EXPIRED) {
// TODO reauthenticate session!
return;
}
if (packet.getHeader().getSessionId() != 0 && (packet.getHeader().getMessage() != SMB2MessageCommandCode.SMB2_SESSION_SETUP)) {
Session session = connectionInfo.getSessionTable().find(packet.getHeader().getSessionId());
if (session == null) {
// check for a not-yet-authenticated session
session = connectionInfo.getPreauthSessionTable().find(packet.getHeader().getSessionId());
if (session == null) {
logger.warn("Illegal request, no session matching the sessionId: {}", packet.getHeader().getSessionId());
//TODO maybe tear down the connection?
return;
}
}
// check packet signature. Drop the packet if it is not correct.
verifyPacketSignature(packet, session);
}
// [MS-SMB2].pdf 3.2.5.1.8 Processing the Response
connectionInfo.getOutstandingRequests().receivedResponseFor(messageId).getPromise().deliver(packet);
}
private void verifyPacketSignature(SMB2Packet packet, Session session) throws TransportException {
if (packet.getHeader().isFlagSet(SMB2MessageFlag.SMB2_FLAGS_SIGNED)) {
if (!session.getPacketSignatory().verify(packet)) {
logger.warn("Invalid packet signature for packet {}", packet);
if (config.isSigningRequired()) {
throw new TransportException("Packet signature for packet " + packet + " was not correct");
}
}
} else if (config.isSigningRequired()) {
logger.warn("Illegal request, client requires message signing, but packet {} is not signed.", packet);
throw new TransportException("Client requires signing, but packet " + packet + " was not signed");
}
}
@Override
public void handleError(Throwable t) {
connectionInfo.getOutstandingRequests().handleError(t);
try {
this.close();
} catch (Exception e) {
String exceptionClass = e.getClass().getSimpleName();
logger.debug("{} while closing connection on error, ignoring: {}", exceptionClass, e.getMessage());
}
}
public String getRemoteHostname() {
return remoteName;
}
public boolean isConnected() {
return transport.isConnected();
}
@Handler
@SuppressWarnings("unused")
private void sessionLogoff(SessionLoggedOff loggedOff) {
connectionInfo.getSessionTable().sessionClosed(loggedOff.getSessionId());
logger.debug("Session << {} >> logged off", loggedOff.getSessionId());
}
private static class DelegatingSMBMessageConverter implements PacketFactory> {
private PacketFactory[] packetFactories;
public DelegatingSMBMessageConverter(PacketFactory... packetFactories) {
this.packetFactories = packetFactories;
}
@Override
public SMBPacket read(byte[] data) throws Buffer.BufferException, IOException {
for (PacketFactory packetFactory : packetFactories) {
if (packetFactory.canHandle(data)) {
return (SMBPacket) packetFactory.read(data);
}
}
throw new IOException("Unknown packet format received.");
}
@Override
public boolean canHandle(byte[] data) {
for (PacketFactory packetFactory : packetFactories) {
if (packetFactory.canHandle(data)) {
return true;
}
}
return false;
}
}
private class CancelRequest implements CancellableFuture.CancelCallback {
private Request request;
public CancelRequest(Request request) {
this.request = request;
}
/**
* [MS-SMB2] 3.2.4.24 Application Requests Canceling an Operation
*/
@Override
public void cancel() {
SMB2CancelRequest cancel = new SMB2CancelRequest(connectionInfo.getNegotiatedProtocol().getDialect(),
request.getMessageId(),
request.getAsyncId());
try {
transport.write(cancel);
} catch (TransportException e) {
logger.error("Failed to send {}", cancel);
}
}
}
}