org.apache.thrift.transport.TSaslTransport Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of libthrift Show documentation
Show all versions of libthrift Show documentation
Thrift is a software framework for scalable cross-language services development.
The newest version!
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.thrift.transport;
import java.nio.charset.StandardCharsets;
import java.util.Objects;
import javax.security.sasl.Sasl;
import javax.security.sasl.SaslClient;
import javax.security.sasl.SaslException;
import javax.security.sasl.SaslServer;
import org.apache.thrift.EncodingUtils;
import org.apache.thrift.TByteArrayOutputStream;
import org.apache.thrift.TConfiguration;
import org.apache.thrift.transport.layered.TFramedTransport;
import org.apache.thrift.transport.sasl.NegotiationStatus;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* A superclass for SASL client/server thrift transports. A subclass need only implement the
* open method.
*/
abstract class TSaslTransport extends TEndpointTransport {
private static final Logger LOGGER = LoggerFactory.getLogger(TSaslTransport.class);
protected static final int DEFAULT_MAX_LENGTH = 0x7FFFFFFF;
protected static final int MECHANISM_NAME_BYTES = 1;
protected static final int STATUS_BYTES = 1;
protected static final int PAYLOAD_LENGTH_BYTES = 4;
protected static enum SaslRole {
SERVER,
CLIENT;
}
/** Transport underlying this one. */
protected TTransport underlyingTransport;
/** Either a SASL client or a SASL server. */
private SaslParticipant sasl;
/**
* Whether or not we should wrap/unwrap reads/writes. Determined by whether or not a QOP is
* negotiated during the SASL handshake.
*/
private boolean shouldWrap = false;
/** Buffer for input. */
private TMemoryInputTransport readBuffer;
/** Buffer for output. */
private final TByteArrayOutputStream writeBuffer = new TByteArrayOutputStream(1024);
/**
* Create a TSaslTransport. It's assumed that setSaslServer will be called later to initialize the
* SASL endpoint underlying this transport.
*
* @param underlyingTransport The thrift transport which this transport is wrapping.
*/
protected TSaslTransport(TTransport underlyingTransport) throws TTransportException {
super(
Objects.isNull(underlyingTransport.getConfiguration())
? new TConfiguration()
: underlyingTransport.getConfiguration());
this.underlyingTransport = underlyingTransport;
this.readBuffer = new TMemoryInputTransport(underlyingTransport.getConfiguration());
}
/**
* Create a TSaslTransport which acts as a client.
*
* @param saslClient The SaslClient which this transport will use for SASL
* negotiation.
* @param underlyingTransport The thrift transport which this transport is wrapping.
*/
protected TSaslTransport(SaslClient saslClient, TTransport underlyingTransport)
throws TTransportException {
super(
Objects.isNull(underlyingTransport.getConfiguration())
? new TConfiguration()
: underlyingTransport.getConfiguration());
sasl = new SaslParticipant(saslClient);
this.underlyingTransport = underlyingTransport;
this.readBuffer = new TMemoryInputTransport(underlyingTransport.getConfiguration());
}
protected void setSaslServer(SaslServer saslServer) {
sasl = new SaslParticipant(saslServer);
}
// Used to read the status byte and payload length.
private final byte[] messageHeader = new byte[STATUS_BYTES + PAYLOAD_LENGTH_BYTES];
/**
* Send a complete Thrift SASL message.
*
* @param status The status to send.
* @param payload The data to send as the payload of this message.
* @throws TTransportException
*/
protected void sendSaslMessage(NegotiationStatus status, byte[] payload)
throws TTransportException {
if (payload == null) payload = new byte[0];
messageHeader[0] = status.getValue();
EncodingUtils.encodeBigEndian(payload.length, messageHeader, STATUS_BYTES);
LOGGER.debug(
"{}: Writing message with status {} and payload length {}",
getRole(),
status,
payload.length);
underlyingTransport.write(messageHeader);
underlyingTransport.write(payload);
underlyingTransport.flush();
}
/**
* Read a complete Thrift SASL message.
*
* @return The SASL status and payload from this message.
* @throws TTransportException Thrown if there is a failure reading from the underlying transport,
* or if a status code of BAD or ERROR is encountered.
*/
protected SaslResponse receiveSaslMessage() throws TTransportException {
underlyingTransport.readAll(messageHeader, 0, messageHeader.length);
byte statusByte = messageHeader[0];
NegotiationStatus status = NegotiationStatus.byValue(statusByte);
if (status == null) {
throw sendAndThrowMessage(NegotiationStatus.ERROR, "Invalid status " + statusByte);
}
int payloadBytes = EncodingUtils.decodeBigEndian(messageHeader, STATUS_BYTES);
if (payloadBytes < 0 || payloadBytes > getConfiguration().getMaxMessageSize() /* 100 MB */) {
throw sendAndThrowMessage(
NegotiationStatus.ERROR, "Invalid payload header length: " + payloadBytes);
}
byte[] payload = new byte[payloadBytes];
underlyingTransport.readAll(payload, 0, payload.length);
if (status == NegotiationStatus.BAD || status == NegotiationStatus.ERROR) {
String remoteMessage = new String(payload, StandardCharsets.UTF_8);
throw new TTransportException("Peer indicated failure: " + remoteMessage);
}
LOGGER.debug(
"{}: Received message with status {} and payload length {}",
getRole(),
status,
payload.length);
return new SaslResponse(status, payload);
}
/**
* Send a Thrift SASL message with the given status (usually BAD or ERROR) and string message, and
* then throw a TTransportException with the given message.
*
* @param status The Thrift SASL status code to send. Usually BAD or ERROR.
* @param message The optional message to send to the other side.
* @throws TTransportException Always thrown with the message provided.
* @return always throws TTransportException but declares return type to allow throw
* sendAndThrowMessage(...) to inform compiler control flow
*/
protected TTransportException sendAndThrowMessage(NegotiationStatus status, String message)
throws TTransportException {
try {
sendSaslMessage(status, message.getBytes(StandardCharsets.UTF_8));
} catch (Exception e) {
LOGGER.warn("Could not send failure response", e);
message += "\nAlso, could not send response: " + e.toString();
}
throw new TTransportException(message);
}
/**
* Implemented by subclasses to start the Thrift SASL handshake process. When this method
* completes, the SaslParticipant in this class is assumed to be initialized.
*
* @throws TTransportException
* @throws SaslException
*/
protected abstract void handleSaslStartMessage() throws TTransportException, SaslException;
protected abstract SaslRole getRole();
/**
* Opens the underlying transport if it's not already open and then performs SASL negotiation. If
* a QOP is negotiated during this SASL handshake, it used for all communication on this transport
* after this call is complete.
*/
@Override
public void open() throws TTransportException {
/*
* readSaslHeader is used to tag whether the SASL header has been read properly.
* If there is a problem in reading the header, there might not be any
* data in the stream, possibly a TCP health check from load balancer.
*/
boolean readSaslHeader = false;
LOGGER.debug("opening transport {}", this);
if (sasl != null && sasl.isComplete())
throw new TTransportException("SASL transport already open");
if (!underlyingTransport.isOpen()) underlyingTransport.open();
try {
// Negotiate a SASL mechanism. The client also sends its
// initial response, or an empty one.
handleSaslStartMessage();
readSaslHeader = true;
LOGGER.debug("{}: Start message handled", getRole());
SaslResponse message = null;
while (!sasl.isComplete()) {
message = receiveSaslMessage();
if (message.status != NegotiationStatus.COMPLETE
&& message.status != NegotiationStatus.OK) {
throw new TTransportException("Expected COMPLETE or OK, got " + message.status);
}
byte[] challenge = sasl.evaluateChallengeOrResponse(message.payload);
// If we are the client, and the server indicates COMPLETE, we don't need to
// send back any further response.
if (message.status == NegotiationStatus.COMPLETE && getRole() == SaslRole.CLIENT) {
LOGGER.debug("{}: All done!", getRole());
continue;
}
sendSaslMessage(
sasl.isComplete() ? NegotiationStatus.COMPLETE : NegotiationStatus.OK, challenge);
}
LOGGER.debug("{}: Main negotiation loop complete", getRole());
// If we're the client, and we're complete, but the server isn't
// complete yet, we need to wait for its response. This will occur
// with ANONYMOUS auth, for example, where we send an initial response
// and are immediately complete.
if (getRole() == SaslRole.CLIENT
&& (message == null || message.status == NegotiationStatus.OK)) {
LOGGER.debug("{}: SASL Client receiving last message", getRole());
message = receiveSaslMessage();
if (message.status != NegotiationStatus.COMPLETE) {
throw new TTransportException("Expected SASL COMPLETE, but got " + message.status);
}
}
} catch (SaslException e) {
try {
LOGGER.error("SASL negotiation failure", e);
throw sendAndThrowMessage(NegotiationStatus.BAD, e.getMessage());
} finally {
underlyingTransport.close();
}
} catch (TTransportException e) {
// If there is no-data or no-sasl header in the stream,
// log the failure, and clean up the underlying transport.
if (!readSaslHeader && e.getType() == TTransportException.END_OF_FILE) {
underlyingTransport.close();
LOGGER.debug("No data or no sasl data in the stream during negotiation");
}
throw e;
}
String qop = (String) sasl.getNegotiatedProperty(Sasl.QOP);
if (qop != null && !qop.equalsIgnoreCase("auth")) shouldWrap = true;
}
/**
* Get the underlying SaslClient.
*
* @return The SaslClient, or null if this transport is backed by a
* SaslServer.
*/
public SaslClient getSaslClient() {
return sasl.saslClient;
}
/**
* Get the underlying transport that Sasl is using.
*
* @return The TTransport transport
*/
public TTransport getUnderlyingTransport() {
return underlyingTransport;
}
/**
* Get the underlying SaslServer.
*
* @return The SaslServer, or null if this transport is backed by a
* SaslClient.
*/
public SaslServer getSaslServer() {
return sasl.saslServer;
}
/**
* Read a 4-byte word from the underlying transport and interpret it as an integer.
*
* @return The length prefix of the next SASL message to read.
* @throws TTransportException Thrown if reading from the underlying transport fails.
*/
protected int readLength() throws TTransportException {
byte[] lenBuf = new byte[4];
underlyingTransport.readAll(lenBuf, 0, lenBuf.length);
return EncodingUtils.decodeBigEndian(lenBuf);
}
/**
* Write the given integer as 4 bytes to the underlying transport.
*
* @param length The length prefix of the next SASL message to write.
* @throws TTransportException Thrown if writing to the underlying transport fails.
*/
protected void writeLength(int length) throws TTransportException {
byte[] lenBuf = new byte[4];
TFramedTransport.encodeFrameSize(length, lenBuf);
underlyingTransport.write(lenBuf);
}
// Below is the SASL implementation of the TTransport interface.
/**
* Closes the underlying transport and disposes of the SASL implementation underlying this
* transport.
*/
@Override
public void close() {
underlyingTransport.close();
try {
sasl.dispose();
} catch (SaslException e) {
LOGGER.warn("Failed to dispose sasl participant.", e);
}
}
/** True if the underlying transport is open and the SASL handshake is complete. */
@Override
public boolean isOpen() {
return underlyingTransport.isOpen() && sasl != null && sasl.isComplete();
}
/**
* Read from the underlying transport. Unwraps the contents if a QOP was negotiated during the
* SASL handshake.
*/
@Override
public int read(byte[] buf, int off, int len) throws TTransportException {
if (!isOpen()) throw new TTransportException("SASL authentication not complete");
int got = readBuffer.read(buf, off, len);
if (got > 0) {
return got;
}
// Read another frame of data
try {
readFrame();
} catch (SaslException e) {
throw new TTransportException(e);
} catch (TTransportException transportException) {
// If there is no-data or no-sasl header in the stream, log the failure, and rethrow.
if (transportException.getType() == TTransportException.END_OF_FILE) {
LOGGER.debug("No data or no sasl data in the stream during negotiation");
}
throw transportException;
}
return readBuffer.read(buf, off, len);
}
/**
* Read a single frame of data from the underlying transport, unwrapping if necessary.
*
* @throws TTransportException Thrown if there's an error reading from the underlying transport.
* @throws SaslException Thrown if there's an error unwrapping the data.
*/
private void readFrame() throws TTransportException, SaslException {
int dataLength = readLength();
if (dataLength < 0)
throw new TTransportException("Read a negative frame size (" + dataLength + ")!");
byte[] buff = new byte[dataLength];
LOGGER.debug("{}: reading data length: {}", getRole(), dataLength);
underlyingTransport.readAll(buff, 0, dataLength);
if (shouldWrap) {
buff = sasl.unwrap(buff, 0, buff.length);
LOGGER.debug("data length after unwrap: {}", buff.length);
}
readBuffer.reset(buff);
}
/** Write to the underlying transport. */
@Override
public void write(byte[] buf, int off, int len) throws TTransportException {
if (!isOpen()) throw new TTransportException("SASL authentication not complete");
writeBuffer.write(buf, off, len);
}
/**
* Flushes to the underlying transport. Wraps the contents if a QOP was negotiated during the SASL
* handshake.
*/
@Override
public void flush() throws TTransportException {
byte[] buf = writeBuffer.get();
int dataLength = writeBuffer.len();
writeBuffer.reset();
if (shouldWrap) {
LOGGER.debug("data length before wrap: {}", dataLength);
try {
buf = sasl.wrap(buf, 0, dataLength);
} catch (SaslException e) {
throw new TTransportException(e);
}
dataLength = buf.length;
}
LOGGER.debug("writing data length: {}", dataLength);
writeLength(dataLength);
underlyingTransport.write(buf, 0, dataLength);
underlyingTransport.flush();
}
/** Used exclusively by readSaslMessage to return both a status and data. */
protected static class SaslResponse {
public NegotiationStatus status;
public byte[] payload;
public SaslResponse(NegotiationStatus status, byte[] payload) {
this.status = status;
this.payload = payload;
}
}
/**
* Used to abstract over the SaslServer and SaslClient classes, which
* share a lot of their interface, but unfortunately don't share a common superclass.
*/
private static class SaslParticipant {
// One of these will always be null.
public SaslServer saslServer;
public SaslClient saslClient;
public SaslParticipant(SaslServer saslServer) {
this.saslServer = saslServer;
}
public SaslParticipant(SaslClient saslClient) {
this.saslClient = saslClient;
}
public byte[] evaluateChallengeOrResponse(byte[] challengeOrResponse) throws SaslException {
if (saslClient != null) {
return saslClient.evaluateChallenge(challengeOrResponse);
} else {
return saslServer.evaluateResponse(challengeOrResponse);
}
}
public boolean isComplete() {
if (saslClient != null) return saslClient.isComplete();
else return saslServer.isComplete();
}
public void dispose() throws SaslException {
if (saslClient != null) saslClient.dispose();
else saslServer.dispose();
}
public byte[] unwrap(byte[] buf, int off, int len) throws SaslException {
if (saslClient != null) return saslClient.unwrap(buf, off, len);
else return saslServer.unwrap(buf, off, len);
}
public byte[] wrap(byte[] buf, int off, int len) throws SaslException {
if (saslClient != null) return saslClient.wrap(buf, off, len);
else return saslServer.wrap(buf, off, len);
}
public Object getNegotiatedProperty(String propName) {
if (saslClient != null) return saslClient.getNegotiatedProperty(propName);
else return saslServer.getNegotiatedProperty(propName);
}
}
}
© 2015 - 2024 Weber Informatics LLC | Privacy Policy