| /** |
| * 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 backtype.storm.messaging.netty; |
| |
| import java.io.IOException; |
| |
| 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.RealmCallback; |
| import javax.security.sasl.RealmChoiceCallback; |
| import javax.security.sasl.Sasl; |
| import javax.security.sasl.SaslClient; |
| import javax.security.sasl.SaslException; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * Implements SASL logic for storm worker client processes. |
| */ |
| public class SaslNettyClient { |
| |
| private static final Logger LOG = LoggerFactory |
| .getLogger(SaslNettyClient.class); |
| |
| /** |
| * Used to respond to server's counterpart, SaslServer with SASL tokens |
| * represented as byte arrays. |
| */ |
| private SaslClient saslClient; |
| |
| /** |
| * Create a SaslNettyClient for authentication with servers. |
| */ |
| public SaslNettyClient(String topologyName, byte[] token) { |
| try { |
| LOG.debug("SaslNettyClient: Creating SASL {} client to authenticate to server ", |
| SaslUtils.AUTH_DIGEST_MD5); |
| |
| saslClient = Sasl.createSaslClient( |
| new String[] { SaslUtils.AUTH_DIGEST_MD5 }, null, null, |
| SaslUtils.DEFAULT_REALM, SaslUtils.getSaslProps(), |
| new SaslClientCallbackHandler(topologyName, token)); |
| |
| } catch (IOException e) { |
| LOG.error("SaslNettyClient: Could not obtain topology token for Netty " |
| + "Client to use to authenticate with a Netty Server."); |
| saslClient = null; |
| } |
| } |
| |
| public boolean isComplete() { |
| return saslClient.isComplete(); |
| } |
| |
| /** |
| * Respond to server's SASL token. |
| * |
| * @param saslTokenMessage |
| * contains server's SASL token |
| * @return client's response SASL token |
| */ |
| public byte[] saslResponse(SaslMessageToken saslTokenMessage) { |
| try { |
| return saslClient.evaluateChallenge(saslTokenMessage.getSaslToken()); |
| } catch (SaslException e) { |
| LOG.error( |
| "saslResponse: Failed to respond to SASL server's token:", |
| e); |
| return null; |
| } |
| } |
| |
| /** |
| * Implementation of javax.security.auth.callback.CallbackHandler that works |
| * with Storm topology tokens. |
| */ |
| private static class SaslClientCallbackHandler implements CallbackHandler { |
| /** Generated username contained in TopologyToken */ |
| private final String userName; |
| /** Generated password contained in TopologyToken */ |
| private final char[] userPassword; |
| |
| /** |
| * Set private members using topology token. |
| */ |
| public SaslClientCallbackHandler(String topologyToken, byte[] token) { |
| this.userName = SaslUtils |
| .encodeIdentifier(topologyToken.getBytes()); |
| this.userPassword = SaslUtils.encodePassword(token); |
| } |
| |
| /** |
| * Implementation used to respond to SASL tokens from server. |
| * |
| * @param callbacks |
| * objects that indicate what credential information the |
| * server's SaslServer requires from the client. |
| * @throws UnsupportedCallbackException |
| */ |
| public void handle(Callback[] callbacks) |
| throws UnsupportedCallbackException { |
| NameCallback nc = null; |
| PasswordCallback pc = null; |
| RealmCallback rc = null; |
| for (Callback callback : callbacks) { |
| if (callback instanceof RealmChoiceCallback) { |
| continue; |
| } else if (callback instanceof NameCallback) { |
| nc = (NameCallback) callback; |
| } else if (callback instanceof PasswordCallback) { |
| pc = (PasswordCallback) callback; |
| } else if (callback instanceof RealmCallback) { |
| rc = (RealmCallback) callback; |
| } else { |
| throw new UnsupportedCallbackException(callback, |
| "handle: Unrecognized SASL client callback"); |
| } |
| } |
| if (nc != null) { |
| LOG.debug("handle: SASL client callback: setting username: {}", |
| userName); |
| nc.setName(userName); |
| } |
| if (pc != null) { |
| LOG.debug("handle: SASL client callback: setting userPassword"); |
| pc.setPassword(userPassword); |
| } |
| if (rc != null) { |
| LOG.debug("handle: SASL client callback: setting realm: {}", |
| rc.getDefaultText()); |
| rc.setText(rc.getDefaultText()); |
| } |
| } |
| } |
| } |