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/**
* 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.hive.service.auth;
import java.io.IOException;
import java.security.Provider;
import java.util.ArrayDeque;
import java.util.Deque;
import java.util.Map;
import javax.security.auth.callback.Callback;
import javax.security.auth.callback.CallbackHandler;
import javax.security.auth.callback.NameCallback;
import javax.security.auth.callback.PasswordCallback;
import javax.security.auth.callback.UnsupportedCallbackException;
import javax.security.sasl.AuthorizeCallback;
import javax.security.sasl.SaslException;
import javax.security.sasl.SaslServer;
import javax.security.sasl.SaslServerFactory;
import org.apache.hive.service.auth.AuthenticationProviderFactory.AuthMethods;
/**
* Sun JDK only provides a PLAIN client and no server. This class implements the Plain SASL server
* conforming to RFC #4616 (http://www.ietf.org/rfc/rfc4616.txt).
*/
public class PlainSaslServer implements SaslServer {
public static final String PLAIN_METHOD = "PLAIN";
private String user;
private final CallbackHandler handler;
PlainSaslServer(CallbackHandler handler, String authMethodStr) throws SaslException {
this.handler = handler;
AuthMethods.getValidAuthMethod(authMethodStr);
}
@Override
public String getMechanismName() {
return PLAIN_METHOD;
}
@Override
public byte[] evaluateResponse(byte[] response) throws SaslException {
try {
// parse the response
// message = [authzid] UTF8NUL authcid UTF8NUL passwd'
Deque<String> tokenList = new ArrayDeque<String>();
StringBuilder messageToken = new StringBuilder();
for (byte b : response) {
if (b == 0) {
tokenList.addLast(messageToken.toString());
messageToken = new StringBuilder();
} else {
messageToken.append((char) b);
}
}
tokenList.addLast(messageToken.toString());
// validate response
if (tokenList.size() < 2 || tokenList.size() > 3) {
throw new SaslException("Invalid message format");
}
String passwd = tokenList.removeLast();
user = tokenList.removeLast();
// optional authzid
String authzId;
if (tokenList.isEmpty()) {
authzId = user;
} else {
authzId = tokenList.removeLast();
}
if (user == null || user.isEmpty()) {
throw new SaslException("No user name provided");
}
if (passwd == null || passwd.isEmpty()) {
throw new SaslException("No password name provided");
}
NameCallback nameCallback = new NameCallback("User");
nameCallback.setName(user);
PasswordCallback pcCallback = new PasswordCallback("Password", false);
pcCallback.setPassword(passwd.toCharArray());
AuthorizeCallback acCallback = new AuthorizeCallback(user, authzId);
Callback[] cbList = {nameCallback, pcCallback, acCallback};
handler.handle(cbList);
if (!acCallback.isAuthorized()) {
throw new SaslException("Authentication failed");
}
} catch (IllegalStateException eL) {
throw new SaslException("Invalid message format", eL);
} catch (IOException eI) {
throw new SaslException("Error validating the login", eI);
} catch (UnsupportedCallbackException eU) {
throw new SaslException("Error validating the login", eU);
}
return null;
}
@Override
public boolean isComplete() {
return user != null;
}
@Override
public String getAuthorizationID() {
return user;
}
@Override
public byte[] unwrap(byte[] incoming, int offset, int len) {
throw new UnsupportedOperationException();
}
@Override
public byte[] wrap(byte[] outgoing, int offset, int len) {
throw new UnsupportedOperationException();
}
@Override
public Object getNegotiatedProperty(String propName) {
return null;
}
@Override
public void dispose() {}
public static class SaslPlainServerFactory implements SaslServerFactory {
@Override
public SaslServer createSaslServer(String mechanism, String protocol, String serverName,
Map<String, ?> props, CallbackHandler cbh) {
if (PLAIN_METHOD.equals(mechanism)) {
try {
return new PlainSaslServer(cbh, protocol);
} catch (SaslException e) {
/* This is to fulfill the contract of the interface which states that an exception shall
be thrown when a SaslServer cannot be created due to an error but null should be
returned when a Server can't be created due to the parameters supplied. And the only
thing PlainSaslServer can fail on is a non-supported authentication mechanism.
That's why we return null instead of throwing the Exception */
return null;
}
}
return null;
}
@Override
public String[] getMechanismNames(Map<String, ?> props) {
return new String[] {PLAIN_METHOD};
}
}
public static class SaslPlainProvider extends Provider {
public SaslPlainProvider() {
super("HiveSaslPlain", 1.0, "Hive Plain SASL provider");
put("SaslServerFactory.PLAIN", SaslPlainServerFactory.class.getName());
}
}
}
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