Github user sudheeshkatkam commented on a diff in the pull request:
https://github.com/apache/drill/pull/578#discussion_r85853038
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/rpc/security/plain/PlainServer.java
---
@@ -0,0 +1,175 @@
+/**
+ * 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.drill.exec.rpc.security.plain;
+
+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.Sasl;
+import javax.security.sasl.SaslException;
+import javax.security.sasl.SaslServer;
+import javax.security.sasl.SaslServerFactory;
+import java.io.IOException;
+import java.security.Provider;
+import java.util.Map;
+
+/**
+ * Plain SaslServer implementation. See https://tools.ietf.org/html/rfc4616
+ */
+public class PlainServer implements SaslServer {
+ private static final org.slf4j.Logger logger =
org.slf4j.LoggerFactory.getLogger(PlainServer.class);
+
+ public static class PlainServerFactory implements SaslServerFactory {
+
+ @Override
+ public SaslServer createSaslServer(final String mechanism, final
String protocol, final String serverName,
+ final Map<String, ?> props, final
CallbackHandler cbh)
+ throws SaslException {
+ return "PLAIN".equals(mechanism) ?
+ props == null ||
"false".equals(props.get(Sasl.POLICY_NOPLAINTEXT)) ?
+ new PlainServer(cbh) :
+ null :
+ null;
+ }
+
+ @Override
+ public String[] getMechanismNames(final Map<String, ?> props) {
+ return props == null ||
"false".equals(props.get(Sasl.POLICY_NOPLAINTEXT)) ?
+ new String[]{"PLAIN"} :
+ new String[0];
+ }
+ }
+
+ @SuppressWarnings("serial")
+ public static class PlainServerProvider extends Provider {
+
+ public PlainServerProvider() {
+ super("PlainServer", 1.0, "PLAIN SASL Server Provider");
+ put("SaslServerFactory.PLAIN", PlainServerFactory.class.getName());
+ }
+ }
+
+ private CallbackHandler cbh;
+ private boolean completed = false;
+ private String authorizationID;
+
+ PlainServer(final CallbackHandler cbh) throws SaslException {
+ if (cbh == null) {
+ throw new SaslException("PLAIN: A callback handler must be
specified");
+ }
+ this.cbh = cbh;
+ }
+
+ @Override
+ public String getMechanismName() {
+ return "PLAIN";
+ }
+
+ @Override
+ public byte[] evaluateResponse(byte[] response) throws SaslException {
+ if (completed) {
+ throw new IllegalStateException("PLAIN authentication already
completed");
+ }
+
+ if (response == null) {
+ throw new SaslException("Received null response");
+ }
+
+ final String payload;
+ try {
+ payload = new String(response, "UTF-8");
+ } catch (final Exception e) {
--- End diff --
Done.
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