/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE
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* or https://OpenDS.dev.java.net/OpenDS.LICENSE.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE. If applicable,
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* add the following below this CDDL HEADER, with the fields enclosed
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* by brackets "[]" replaced with your own identifying information:
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* Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*
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*
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* Copyright 2006-2008 Sun Microsystems, Inc.
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*/
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package org.opends.server.extensions;
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import static org.opends.messages.ExtensionMessages.*;
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import static org.opends.server.loggers.ErrorLogger.*;
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import static org.opends.server.loggers.debug.DebugLogger.*;
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import static org.opends.server.util.ServerConstants.*;
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import static org.opends.server.util.StaticUtils.*;
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import java.io.BufferedWriter;
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import java.io.File;
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import java.io.FileWriter;
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import java.io.IOException;
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import java.net.InetAddress;
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import java.net.UnknownHostException;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.List;
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import javax.security.auth.callback.Callback;
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import javax.security.auth.callback.CallbackHandler;
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import javax.security.auth.callback.UnsupportedCallbackException;
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import javax.security.auth.login.LoginContext;
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import javax.security.auth.login.LoginException;
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import javax.security.sasl.Sasl;
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import javax.security.sasl.SaslException;
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import org.opends.messages.Message;
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import org.opends.server.admin.server.ConfigurationChangeListener;
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import org.opends.server.admin.std.meta.
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GSSAPISASLMechanismHandlerCfgDefn.QualityOfProtection;
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import org.opends.server.admin.std.server.GSSAPISASLMechanismHandlerCfg;
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import org.opends.server.admin.std.server.SASLMechanismHandlerCfg;
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import org.opends.server.api.ClientConnection;
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import org.opends.server.api.IdentityMapper;
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import org.opends.server.api.SASLMechanismHandler;
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import org.opends.server.config.ConfigException;
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import org.opends.server.core.BindOperation;
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import org.opends.server.core.DirectoryServer;
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import org.opends.server.loggers.debug.DebugTracer;
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import org.opends.server.types.ConfigChangeResult;
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import org.opends.server.types.DN;
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import org.opends.server.types.DebugLogLevel;
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import org.opends.server.types.DirectoryException;
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import org.opends.server.types.Entry;
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import org.opends.server.types.InitializationException;
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import org.opends.server.types.ResultCode;
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/**
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* This class provides an implementation of a SASL mechanism that
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* authenticates clients through Kerberos over GSSAPI.
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*/
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public class GSSAPISASLMechanismHandler extends
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SASLMechanismHandler<GSSAPISASLMechanismHandlerCfg> implements
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ConfigurationChangeListener<GSSAPISASLMechanismHandlerCfg>, CallbackHandler
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{
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// The tracer object for the debug logger.
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private static final DebugTracer TRACER = getTracer();
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// The DN of the configuration entry for this SASL mechanism
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// handler.
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private DN configEntryDN;
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// The current configuration for this SASL mechanism handler.
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private GSSAPISASLMechanismHandlerCfg configuration;
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// The identity mapper that will be used to map identities.
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private IdentityMapper<?> identityMapper;
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// The properties to use when creating a SASL server to process the
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// GSSAPI authentication.
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private HashMap<String, String> saslProps;
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// The fully qualified domain name used when creating the SASL
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// server.
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private String serverFQDN;
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// The login context used to perform server-side authentication.
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private LoginContext loginContext;
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/**
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* Creates a new instance of this SASL mechanism handler. No
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* initialization should be done in this method, as it should all be
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* performed in the <CODE>initializeSASLMechanismHandler</CODE>
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* method.
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*/
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public GSSAPISASLMechanismHandler()
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{
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super();
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}
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/**
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* {@inheritDoc}
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*/
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@Override()
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public void initializeSASLMechanismHandler(
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GSSAPISASLMechanismHandlerCfg configuration) throws ConfigException,
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InitializationException
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{
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configuration.addGSSAPIChangeListener(this);
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this.configuration = configuration;
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configEntryDN = configuration.dn();
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try
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{
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DN identityMapperDN = configuration.getIdentityMapperDN();
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identityMapper = DirectoryServer.getIdentityMapper(identityMapperDN);
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serverFQDN = getFQDN(configuration);
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Message msg = INFO_GSSAPI_SERVER_FQDN.get(serverFQDN);
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logError(msg);
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saslProps = new HashMap<String, String>();
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saslProps.put(Sasl.QOP, getQOP(configuration));
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saslProps.put(Sasl.REUSE, "false");
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String configFileName = configureLoginConfFile(configuration);
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System.setProperty(JAAS_PROPERTY_CONFIG_FILE, configFileName);
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System.setProperty(JAAS_PROPERTY_SUBJECT_CREDS_ONLY, "false");
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getKdcRealm(configuration);
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DirectoryServer.registerSASLMechanismHandler(SASL_MECHANISM_GSSAPI, this);
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login();
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}
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catch (UnknownHostException unhe)
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{
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if (debugEnabled())
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{
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TRACER.debugCaught(DebugLogLevel.ERROR, unhe);
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}
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Message message = ERR_SASL_CANNOT_GET_SERVER_FQDN.get(String
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.valueOf(configEntryDN), getExceptionMessage(unhe));
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throw new InitializationException(message, unhe);
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}
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catch (IOException ioe)
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{
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if (debugEnabled())
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{
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TRACER.debugCaught(DebugLogLevel.ERROR, ioe);
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}
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Message message = ERR_SASLGSSAPI_CANNOT_CREATE_JAAS_CONFIG
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.get(getExceptionMessage(ioe));
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throw new InitializationException(message, ioe);
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}
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catch (LoginException le)
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{
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if (debugEnabled())
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{
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TRACER.debugCaught(DebugLogLevel.ERROR, le);
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}
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Message message = ERR_SASLGSSAPI_CANNOT_CREATE_LOGIN_CONTEXT
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.get(getExceptionMessage(le));
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throw new InitializationException(message, le);
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}
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}
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/**
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* Checks to make sure that the ds-cfg-kdc-address and dc-cfg-realm
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* are both defined in the configuration. If only one is set, then
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* that is an error. If both are defined, or, both are null that is
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* fine.
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*
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* @param configuration
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* The configuration to use.
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* @throws InitializationException
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* If the properties violate the requirements.
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*/
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private void getKdcRealm(GSSAPISASLMechanismHandlerCfg configuration)
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throws InitializationException
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{
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String kdcAddress = configuration.getKdcAddress();
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String realm = configuration.getRealm();
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if ((kdcAddress != null && realm == null)
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|| (kdcAddress == null && realm != null))
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{
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Message message = ERR_SASLGSSAPI_KDC_REALM_NOT_DEFINED.get();
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throw new InitializationException(message);
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}
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else if (kdcAddress != null && realm != null)
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{
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System.setProperty(KRBV_PROPERTY_KDC, kdcAddress);
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System.setProperty(KRBV_PROPERTY_REALM, realm);
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}
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}
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/**
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* During login, callbacks are usually used to prompt for passwords.
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* All of the GSSAPI login information is provided in the properties
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* and login.conf file, so callbacks are ignored.
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*
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* @param callbacks
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* An array of callbacks to process.
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* @throws UnsupportedCallbackException
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* if an error occurs.
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*/
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public void handle(Callback[] callbacks) throws UnsupportedCallbackException
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{
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}
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/**
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* Returns the fully qualified name either defined in the
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* configuration, or, determined by examining the system
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* configuration.
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*
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* @param configuration
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* The configuration to check.
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* @return The fully qualified hostname of the server.
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* @throws UnknownHostException
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* If the name cannot be determined from the system
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* configuration.
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*/
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private String getFQDN(GSSAPISASLMechanismHandlerCfg configuration)
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throws UnknownHostException
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{
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String serverName = configuration.getServerFqdn();
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if (serverName == null)
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{
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serverName = InetAddress.getLocalHost().getCanonicalHostName();
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}
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return serverName;
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}
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/**
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* Create a login context or login using the principal and keytab
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* information specified in the configuration.
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*
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* @throws LoginException
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* If a login context cannot be created.
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*/
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private void login() throws LoginException
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{
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loginContext = new LoginContext(GSSAPISASLMechanismHandler.class.getName(),
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this);
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loginContext.login();
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}
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/**
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* Logout of the current login context.
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*/
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private void logout()
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{
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try
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{
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loginContext.logout();
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}
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catch (LoginException e)
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{
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if (debugEnabled())
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{
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TRACER.debugCaught(DebugLogLevel.ERROR, e);
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}
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}
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}
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/**
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* Creates an login.conf file from information in the specified
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* configuration. This file is used during the login phase.
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*
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* @param configuration
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* The new configuration to use.
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* @return The filename of the new configuration file.
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* @throws IOException
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* If the configuration file cannot be created.
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*/
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private String configureLoginConfFile(
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GSSAPISASLMechanismHandlerCfg configuration) throws IOException
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{
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String configFileName;
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File tempFile = File.createTempFile("login", "conf");
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configFileName = tempFile.getAbsolutePath();
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tempFile.deleteOnExit();
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BufferedWriter w = new BufferedWriter(new FileWriter(tempFile, false));
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w.write(getClass().getName() + " {");
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w.newLine();
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w.write(" com.sun.security.auth.module.Krb5LoginModule required "
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+ "storeKey=true useKeyTab=true ");
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String keyTabFile = configuration.getKeytab();
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if (keyTabFile != null)
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{
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w.write("keyTab=\"" + keyTabFile + "\" ");
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}
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StringBuilder principal = new StringBuilder();
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String principalName = configuration.getPrincipalName();
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String realm = configuration.getRealm();
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if (principalName != null)
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{
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principal.append("principal=\"" + principalName);
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}
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else
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{
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principal.append("principal=\"ldap/" + serverFQDN);
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}
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if (realm != null)
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{
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principal.append("@" + realm);
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}
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w.write(principal.toString());
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Message msg = INFO_GSSAPI_PRINCIPAL_NAME.get(principal.toString());
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logError(msg);
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w.write("\";");
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w.newLine();
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w.write("};");
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w.newLine();
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w.flush();
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w.close();
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return configFileName;
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}
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/**
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* {@inheritDoc}
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*/
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@Override()
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public void finalizeSASLMechanismHandler()
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{
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logout();
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configuration.removeGSSAPIChangeListener(this);
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DirectoryServer.deregisterSASLMechanismHandler(SASL_MECHANISM_GSSAPI);
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}
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/**
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* {@inheritDoc}
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*/
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@Override()
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public void processSASLBind(BindOperation bindOp)
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{
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ClientConnection clientConnection = bindOp.getClientConnection();
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if (clientConnection == null)
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{
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Message message = ERR_SASLGSSAPI_NO_CLIENT_CONNECTION.get();
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bindOp.setAuthFailureReason(message);
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bindOp.setResultCode(ResultCode.INVALID_CREDENTIALS);
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return;
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}
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ClientConnection clientConn = bindOp.getClientConnection();
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SASLContext saslContext = (SASLContext) clientConn.getSASLAuthStateInfo();
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if (saslContext == null)
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{
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try
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{
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//If the connection is secure already (i.e., TLS), then make the
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//receive buffers sizes match.
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if(clientConn.isSecure()) {
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HashMap<String, String>secProps =
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new HashMap<String,String>(saslProps);
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int maxBuf = clientConn.getAppBufferSize();
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secProps.put(Sasl.MAX_BUFFER, Integer.toString(maxBuf));
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saslContext = SASLContext.createSASLContext(secProps, serverFQDN,
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SASL_MECHANISM_GSSAPI, identityMapper);
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} else {
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saslContext = SASLContext.createSASLContext(saslProps, serverFQDN,
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SASL_MECHANISM_GSSAPI, identityMapper);
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}
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}
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catch (SaslException ex)
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{
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if (debugEnabled())
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{
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TRACER.debugCaught(DebugLogLevel.ERROR, ex);
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}
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Message msg = ERR_SASL_CONTEXT_CREATE_ERROR.get(SASL_MECHANISM_GSSAPI,
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getExceptionMessage(ex));
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clientConn.setSASLAuthStateInfo(null);
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bindOp.setAuthFailureReason(msg);
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bindOp.setResultCode(ResultCode.INVALID_CREDENTIALS);
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return;
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}
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}
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saslContext.performAuthentication(loginContext, bindOp);
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}
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/**
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* Retrieves the user account for the user associated with the
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* provided authorization ID.
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*
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* @param bindOperation
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* The bind operation from which the provided authorization
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* ID was derived.
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* @param authzID
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* The authorization ID for which to retrieve the
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* associated user.
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* @return The user entry for the user with the specified
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* authorization ID, or {@code null} if none is identified.
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* @throws DirectoryException
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* If a problem occurs while searching the directory for
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* the associated user, or if multiple matching entries
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* are found.
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*/
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public Entry getUserForAuthzID(BindOperation bindOperation, String authzID)
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throws DirectoryException
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{
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return identityMapper.getEntryForID(authzID);
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}
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/**
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* {@inheritDoc}
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*/
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@Override()
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public boolean isPasswordBased(String mechanism)
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{
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// This is not a password-based mechanism.
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return false;
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}
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/**
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* {@inheritDoc}
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*/
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@Override()
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public boolean isSecure(String mechanism)
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{
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// This may be considered a secure mechanism.
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return true;
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}
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/**
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* {@inheritDoc}
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*/
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@Override()
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public boolean isConfigurationAcceptable(
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SASLMechanismHandlerCfg configuration, List<Message> unacceptableReasons)
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{
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GSSAPISASLMechanismHandlerCfg config =
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(GSSAPISASLMechanismHandlerCfg) configuration;
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return isConfigurationChangeAcceptable(config, unacceptableReasons);
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}
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/**
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* {@inheritDoc}
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*/
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public boolean isConfigurationChangeAcceptable(
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GSSAPISASLMechanismHandlerCfg configuration,
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List<Message> unacceptableReasons)
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{
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return true;
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}
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/**
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* {@inheritDoc}
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*/
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public ConfigChangeResult applyConfigurationChange(
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GSSAPISASLMechanismHandlerCfg configuration)
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{
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ResultCode resultCode = ResultCode.SUCCESS;
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boolean adminActionRequired = false;
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ArrayList<Message> messages = new ArrayList<Message>();
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DN identityMapperDN = configuration.getIdentityMapperDN();
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IdentityMapper<?> newIdentityMapper = DirectoryServer
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.getIdentityMapper(identityMapperDN);
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identityMapper = newIdentityMapper;
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saslProps = new HashMap<String, String>();
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saslProps.put(Sasl.QOP, getQOP(configuration));
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saslProps.put(Sasl.REUSE, "false");
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this.configuration = configuration;
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return new ConfigChangeResult(resultCode, adminActionRequired, messages);
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}
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/**
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* Retrieves the QOP (quality-of-protection) from the specified
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* configuration.
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*
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* @param configuration
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* The new configuration to use.
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* @return A string representing the quality-of-protection.
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*/
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private String getQOP(GSSAPISASLMechanismHandlerCfg configuration)
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{
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QualityOfProtection QOP = configuration.getQualityOfProtection();
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if (QOP.equals(QualityOfProtection.CONFIDENTIALITY))
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return "auth-conf";
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else if (QOP.equals(QualityOfProtection.INTEGRITY))
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return "auth-int";
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else
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return "auth";
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}
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}
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