/*
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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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* Portions Copyright 2006-2007 Sun Microsystems, Inc.
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*/
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package org.opends.server.extensions;
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import java.security.PrivilegedExceptionAction;
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import java.util.HashMap;
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import javax.security.auth.Subject;
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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.NameCallback;
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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.sasl.AuthorizeCallback;
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import javax.security.sasl.Sasl;
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import javax.security.sasl.SaslServer;
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import org.opends.server.api.ClientConnection;
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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.protocols.asn1.ASN1OctetString;
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import org.opends.server.types.AuthenticationInfo;
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import org.opends.server.types.ByteString;
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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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import static org.opends.server.loggers.debug.DebugLogger.debugCaught;
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import static org.opends.server.loggers.debug.DebugLogger.debugEnabled;
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import org.opends.server.types.DebugLogLevel;
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import static org.opends.server.messages.ExtensionsMessages.*;
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import static org.opends.server.messages.MessageHandler.*;
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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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/**
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* This class defines a data structure that holds state information needed for
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* processing a SASL GSSAPI bind from a client.
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*/
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public class GSSAPIStateInfo
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implements PrivilegedExceptionAction<Boolean>, CallbackHandler
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{
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// The bind operation with which this state is associated.
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private BindOperation bindOperation;
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// The client connection with which this state is associated.
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private ClientConnection clientConnection;
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// The entry of the user that authenticated in this session.
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private Entry userEntry;
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// The GSSAPI authentication handler that created this state information.
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private GSSAPISASLMechanismHandler gssapiHandler;
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// The login context used to perform server-side authentication.
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private LoginContext loginContext;
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// The SASL server that will be used to actually perform the authentication.
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private SaslServer saslServer;
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// The protocol that the client is using to communicate with the server.
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private String protocol;
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// The FQDN of this system to use in the authentication process.
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private String serverFQDN;
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/**
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* Creates a new GSSAPI state info structure with the provided information.
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*
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* @param gssapiHandler The GSSAPI authentication handler that created this
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* state information.
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* @param bindOperation The bind operation with which this state is
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* associated.
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* @param serverFQDN The fully-qualified domain name for the server to
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* use in the authentication process.
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*
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* @throws InitializationException If it is not possible to authenticate to
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* the KDC to verify the client credentials.
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*/
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public GSSAPIStateInfo(GSSAPISASLMechanismHandler gssapiHandler,
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BindOperation bindOperation, String serverFQDN)
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throws InitializationException
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{
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this.gssapiHandler = gssapiHandler;
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this.bindOperation = bindOperation;
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this.serverFQDN = serverFQDN;
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clientConnection = bindOperation.getClientConnection();
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protocol = toLowerCase(clientConnection.getProtocol());
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userEntry = null;
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// Create the LoginContext and do the server-side authentication.
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// FIXME -- Can this be moved to a one-time call in the GSSAPI handler
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// rather than once per GSSAPI bind attempt?
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try
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{
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loginContext =
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new LoginContext(GSSAPISASLMechanismHandler.class.getName(), this);
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}
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catch (Exception e)
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{
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if (debugEnabled())
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{
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debugCaught(DebugLogLevel.ERROR, e);
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}
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int msgID = MSGID_SASLGSSAPI_CANNOT_CREATE_LOGIN_CONTEXT;
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String message = getMessage(msgID, stackTraceToSingleLineString(e));
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throw new InitializationException(msgID, message, e);
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}
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try
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{
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loginContext.login();
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}
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catch (Exception e)
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{
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if (debugEnabled())
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{
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debugCaught(DebugLogLevel.ERROR, e);
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}
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int msgID = MSGID_SASLGSSAPI_CANNOT_AUTHENTICATE_SERVER;
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String message = getMessage(msgID, stackTraceToSingleLineString(e));
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throw new InitializationException(msgID, message, e);
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}
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saslServer = null;
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}
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/**
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* Sets the bind operation for the next stage of processing in the GSSAPI
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* authentication. This must be called before the processing is performed so
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* that the appropriate response may be sent to the client.
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*
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* @param bindOperation The bind operation for the next stage of processing
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* in the GSSAPI authentication.
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*/
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public void setBindOperation(BindOperation bindOperation)
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{
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this.bindOperation = bindOperation;
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}
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/**
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* Retrieves the entry of the user that has authenticated on this GSSAPI
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* session. This should only be available after a successful GSSAPI
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* authentication. The return value of this method should be considered
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* unreliable if GSSAPI authentication has not yet completed successfully.
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*
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* @return x
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*/
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public Entry getUserEntry()
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{
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return userEntry;
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}
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/**
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* Destroys any sensitive information that might be associated with the SASL
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* server instance.
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*/
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public void dispose()
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{
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try
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{
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saslServer.dispose();
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}
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catch (Exception e)
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{
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if (debugEnabled())
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{
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debugCaught(DebugLogLevel.ERROR, e);
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}
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}
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}
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/**
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* Processes the next stage of the GSSAPI bind process. This may be used for
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* the first stage or any stage thereafter until the authentication is
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* complete. It will automatically take care of the JAAS processing behind
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* the scenes as necessary.
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*/
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public void processAuthenticationStage()
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{
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try
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{
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Subject.doAs(loginContext.getSubject(), this);
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}
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catch (Exception e)
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{
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if (debugEnabled())
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{
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debugCaught(DebugLogLevel.ERROR, e);
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}
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}
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}
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/**
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* Processes a stage of the SASL GSSAPI bind request. The
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* <CODE>setBindOperation</CODE> method must have been called to update the
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* reference to the latest bind request before invoking this method through
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* <CODE>doAs</CODE> or <CODE>doAsPrivileged</CODE>.
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*
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* @return <CODE>true</CODE> if there was no error during this stage of the
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* bind and processing can continue, or <CODE>false</CODE> if an
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* error occurred and and processing should not continue.
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*/
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public Boolean run()
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{
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if (saslServer == null)
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{
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// Create the SASL server instance for use with this authentication
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// attempt.
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try
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{
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HashMap<String,String> saslProperties = new HashMap<String,String>();
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// FIXME -- We need to add support for auth-int and auth-conf.
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// propertyMap.put(Sasl.QOP, "auth,auth-int,auth-conf");
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saslProperties.put(Sasl.QOP, "auth");
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saslProperties.put(Sasl.REUSE, "false");
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saslServer = Sasl.createSaslServer(SASL_MECHANISM_GSSAPI, protocol,
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serverFQDN, saslProperties, this);
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}
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catch (Exception e)
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{
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if (debugEnabled())
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{
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debugCaught(DebugLogLevel.ERROR, e);
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}
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int msgID = MSGID_SASLGSSAPI_CANNOT_CREATE_SASL_SERVER;
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String message = getMessage(msgID, stackTraceToSingleLineString(e));
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clientConnection.setSASLAuthStateInfo(null);
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bindOperation.setAuthFailureReason(msgID, message);
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bindOperation.setResultCode(ResultCode.INVALID_CREDENTIALS);
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return false;
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}
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}
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// Get the SASL credentials from the bind request.
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byte[] clientCredBytes;
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ByteString clientCredentials = bindOperation.getSASLCredentials();
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if (clientCredentials == null)
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{
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clientCredBytes = new byte[0];
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}
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else
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{
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clientCredBytes = clientCredentials.value();
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}
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// Process the client SASL credentials and get the data to include in the
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// server SASL credentials of the response.
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ASN1OctetString serverSASLCredentials;
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try
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{
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byte[] serverCredBytes = saslServer.evaluateResponse(clientCredBytes);
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if (serverCredBytes == null)
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{
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serverSASLCredentials = null;
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}
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else
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{
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serverSASLCredentials = new ASN1OctetString(serverCredBytes);
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}
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}
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catch (Exception e)
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{
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if (debugEnabled())
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{
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debugCaught(DebugLogLevel.ERROR, e);
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}
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try
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{
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saslServer.dispose();
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}
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catch (Exception e2)
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{
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if (debugEnabled())
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{
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debugCaught(DebugLogLevel.ERROR, e2);
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}
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}
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int msgID = MSGID_SASLGSSAPI_CANNOT_EVALUATE_RESPONSE;
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String message = getMessage(msgID, stackTraceToSingleLineString(e));
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clientConnection.setSASLAuthStateInfo(null);
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bindOperation.setAuthFailureReason(msgID, message);
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bindOperation.setResultCode(ResultCode.INVALID_CREDENTIALS);
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return false;
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}
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// If the authentication is not yet complete, then send a "SASL bind in
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// progress" response to the client.
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if (! saslServer.isComplete())
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{
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clientConnection.setSASLAuthStateInfo(saslServer);
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bindOperation.setResultCode(ResultCode.SASL_BIND_IN_PROGRESS);
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bindOperation.setServerSASLCredentials(serverSASLCredentials);
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return true;
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}
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// If the authentication is complete, then get the authorization ID from the
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// SASL server and map that to a user in the directory.
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String authzID = saslServer.getAuthorizationID();
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if ((authzID == null) || (authzID.length() == 0))
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{
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try
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{
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saslServer.dispose();
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}
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catch (Exception e)
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{
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if (debugEnabled())
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{
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debugCaught(DebugLogLevel.ERROR, e);
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}
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}
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int msgID = MSGID_SASLGSSAPI_NO_AUTHZ_ID;
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String message = getMessage(msgID);
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clientConnection.setSASLAuthStateInfo(null);
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bindOperation.setAuthFailureReason(msgID, message);
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bindOperation.setResultCode(ResultCode.INVALID_CREDENTIALS);
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return false;
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}
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try
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{
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userEntry = gssapiHandler.getUserForAuthzID(bindOperation, authzID);
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}
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catch (DirectoryException de)
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{
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if (debugEnabled())
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{
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debugCaught(DebugLogLevel.ERROR, de);
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}
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try
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{
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saslServer.dispose();
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}
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catch (Exception e)
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{
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if (debugEnabled())
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{
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debugCaught(DebugLogLevel.ERROR, e);
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}
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}
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bindOperation.setResultCode(ResultCode.INVALID_CREDENTIALS);
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bindOperation.setAuthFailureReason(de.getErrorMessageID(),
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de.getErrorMessage());
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clientConnection.setSASLAuthStateInfo(null);
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return false;
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}
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// If the user entry is null, then we couldn't map the authorization ID to
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// a user.
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if (userEntry == null)
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{
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try
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{
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saslServer.dispose();
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}
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catch (Exception e)
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{
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if (debugEnabled())
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{
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debugCaught(DebugLogLevel.ERROR, e);
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}
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}
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int msgID = MSGID_SASLGSSAPI_CANNOT_MAP_AUTHZID;
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String message = getMessage(msgID, authzID);
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clientConnection.setSASLAuthStateInfo(null);
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bindOperation.setAuthFailureReason(msgID, message);
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bindOperation.setResultCode(ResultCode.INVALID_CREDENTIALS);
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return false;
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}
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else
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{
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bindOperation.setSASLAuthUserEntry(userEntry);
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}
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// The authentication was successful, so set the proper state information
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// in the client connection and return success.
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AuthenticationInfo authInfo =
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new AuthenticationInfo(userEntry, SASL_MECHANISM_GSSAPI,
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DirectoryServer.isRootDN(userEntry.getDN()));
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bindOperation.setAuthenticationInfo(authInfo);
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bindOperation.setResultCode(ResultCode.SUCCESS);
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// FIXME -- If we're using integrity or confidentiality, then we can't do
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// this.
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clientConnection.setSASLAuthStateInfo(null);
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try
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{
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saslServer.dispose();
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}
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catch (Exception e)
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{
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if (debugEnabled())
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{
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debugCaught(DebugLogLevel.ERROR, e);
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}
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}
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return true;
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}
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/**
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* Handles any callbacks that might be required in order to process a SASL
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* GSSAPI bind on the server. In this case, if an authorization ID was
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* provided, then a callback may be used to determine whether it is
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* acceptable.
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*
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* @param callbacks The callbacks needed to provide information for the
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* GSSAPI authentication process.
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*
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* @throws UnsupportedCallbackException If an unexpected callback is
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* included in the provided set.
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*/
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public void handle(Callback[] callbacks)
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throws UnsupportedCallbackException
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{
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for (Callback callback : callbacks)
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{
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if (callback instanceof NameCallback)
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{
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String authID = toLowerCase(clientConnection.getProtocol()) + "/" +
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serverFQDN;
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((NameCallback) callback).setName(authID);
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}
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else if (callback instanceof AuthorizeCallback)
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{
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// FIXME -- Should we allow an authzID different from the authID?
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// FIXME -- Do we need to do anything else here?
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AuthorizeCallback authzCallback = (AuthorizeCallback) callback;
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String authID = authzCallback.getAuthenticationID();
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String authzID = authzCallback.getAuthorizationID();
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if (authID.equals(authzID))
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{
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authzCallback.setAuthorizedID(authzID);
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authzCallback.setAuthorized(true);
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}
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else
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{
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int msgID = MSGID_SASLGSSAPI_DIFFERENT_AUTHID_AND_AUTHZID;
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String message = getMessage(msgID, authID, authzID);
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bindOperation.setAuthFailureReason(msgID, message);
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authzCallback.setAuthorized(false);
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}
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}
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else
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{
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// We weren't prepared for this type of callback.
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int msgID = MSGID_SASLGSSAPI_UNEXPECTED_CALLBACK;
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String message = getMessage(msgID, String.valueOf(callback));
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throw new UnsupportedCallbackException(callback, message);
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}
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}
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}
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}
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