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/**
* Copyright (C) 2004-2009 Jive Software. All rights reserved.
*
* Licensed 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.jivesoftware.openfire.clearspace;
import static org.jivesoftware.openfire.clearspace.ClearspaceManager.HttpType.GET;
import java.util.StringTokenizer;
import javax.security.sasl.SaslException;
import javax.security.sasl.SaslServer;
import org.dom4j.Element;
import org.jivesoftware.util.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.xmpp.packet.JID;
/**
* Implements the CLEARSPACE server-side SASL mechanism.
*
* @author Armando Jagucki
*/
public class ClearspaceSaslServer implements SaslServer {
private static final Logger Log = LoggerFactory.getLogger(ClearspaceSaslServer.class);
private boolean completed;
private String jid;
public ClearspaceSaslServer() {
this.completed = false;
}
/**
* Returns the mechanism name of this SASL server.
* (e.g. "CRAM-MD5", "GSSAPI").
*
* @return A non-null string representing the mechanism name.
*/
public String getMechanismName() {
return "CLEARSPACE";
}
/**
* Evaluates the response data and generates a challenge.
* <p>
* If a response is received from the client during the authentication
* process, this method is called to prepare an appropriate next
* challenge to submit to the client. The challenge is null if the
* authentication has succeeded and no more challenge data is to be sent
* to the client. It is non-null if the authentication must be continued
* by sending a challenge to the client, or if the authentication has
* succeeded but challenge data needs to be processed by the client.
* <tt>isComplete()</tt> should be called
* after each call to <tt>evaluateResponse()</tt>,to determine if any further
* response is needed from the client.</p>
*
* @param response The non-null (but possibly empty) response sent
* by the client.
* @return The possibly null challenge to send to the client.
* It is null if the authentication has succeeded and there is
* no more challenge data to be sent to the client.
* @throws javax.security.sasl.SaslException
* If an error occurred while processing
* the response or generating a challenge.
*/
public byte[] evaluateResponse(byte[] response) throws SaslException {
ClearspaceManager csManager = ClearspaceManager.getInstance();
String responseStr = new String(response);
// Parse data and obtain jid & random string
StringTokenizer tokens = new StringTokenizer(responseStr, "\u0000");
if (tokens.countTokens() != 2) {
// Info was not provided correctly
completed = false;
return null;
}
jid = tokens.nextToken();
int atIndex = jid.lastIndexOf("@");
String node = jid.substring(0, atIndex);
jid = JID.escapeNode(node) + "@" + jid.substring(atIndex + 1);
try {
responseStr = StringUtils.encodeBase64(responseStr);
Element resultElement =
csManager.executeRequest(GET, "groupChatAuthService/isAuthTokenValid/" + responseStr);
if ("true".equals(WSUtils.getReturn(resultElement))) {
completed = true;
}
else {
// Failed to authenticate the user so throw an error so SASL failure is returned
throw new SaslException("SASL CLEARSPACE: user not authorized: " + jid);
}
} catch (SaslException e) {
// rethrow exception
throw e;
} catch (Exception e) {
Log.error("Failed communicating with Clearspace", e);
throw new SaslException("SASL CLEARSPACE: user not authorized due to an error: " + jid);
}
return null;
}
/**
* Determines whether the authentication exchange has completed.
* This method is typically called after each invocation of
* <tt>evaluateResponse()</tt> to determine whether the
* authentication has completed successfully or should be continued.
*
* @return true if the authentication exchange has completed; false otherwise.
*/
public boolean isComplete() {
return completed;
}
/**
* Reports the authorization ID in effect for the client of this
* session.
* This method can only be called if isComplete() returns true.
*
* @return The authorization ID of the client.
* @throws IllegalStateException if this authentication session has not completed
*/
public String getAuthorizationID() {
if (completed) {
return jid;
}
else {
throw new IllegalStateException("CLEARSPACE authentication not completed");
}
}
/**
* Unwraps a byte array received from the client.
* This method can be called only after the authentication exchange has
* completed (i.e., when <tt>isComplete()</tt> returns true) and only if
* the authentication exchange has negotiated integrity and/or privacy
* as the quality of protection; otherwise,
* an <tt>IllegalStateException</tt> is thrown.
* <p>
* <tt>incoming</tt> is the contents of the SASL buffer as defined in RFC 2222
* without the leading four octet field that represents the length.
* <tt>offset</tt> and <tt>len</tt> specify the portion of <tt>incoming</tt>
* to use.</p>
*
* @param incoming A non-null byte array containing the encoded bytes
* from the client.
* @param offset The starting position at <tt>incoming</tt> of the bytes to use.
* @param len The number of bytes from <tt>incoming</tt> to use.
* @return A non-null byte array containing the decoded bytes.
* @throws javax.security.sasl.SaslException
* if <tt>incoming</tt> cannot be successfully
* unwrapped.
* @throws IllegalStateException if the authentication exchange has
* not completed, or if the negotiated quality of protection
* has neither integrity nor privacy
*/
public byte[] unwrap(byte[] incoming, int offset, int len) throws SaslException {
return new byte[0];
}
/**
* Wraps a byte array to be sent to the client.
* This method can be called only after the authentication exchange has
* completed (i.e., when <tt>isComplete()</tt> returns true) and only if
* the authentication exchange has negotiated integrity and/or privacy
* as the quality of protection; otherwise, a <tt>SaslException</tt> is thrown.
* <p>
* The result of this method
* will make up the contents of the SASL buffer as defined in RFC 2222
* without the leading four octet field that represents the length.
* <tt>offset</tt> and <tt>len</tt> specify the portion of <tt>outgoing</tt>
* to use.</p>
*
* @param outgoing A non-null byte array containing the bytes to encode.
* @param offset The starting position at <tt>outgoing</tt> of the bytes to use.
* @param len The number of bytes from <tt>outgoing</tt> to use.
* @return A non-null byte array containing the encoded bytes.
* @throws javax.security.sasl.SaslException
* if <tt>outgoing</tt> cannot be successfully
* wrapped.
* @throws IllegalStateException if the authentication exchange has
* not completed, or if the negotiated quality of protection has
* neither integrity nor privacy.
*/
public byte[] wrap(byte[] outgoing, int offset, int len) throws SaslException {
return new byte[0];
}
/**
* Retrieves the negotiated property.
* This method can be called only after the authentication exchange has
* completed (i.e., when <tt>isComplete()</tt> returns true); otherwise, an
* <tt>IllegalStateException</tt> is thrown.
*
* @param propName the property
* @return The value of the negotiated property. If null, the property was
* not negotiated or is not applicable to this mechanism.
* @throws IllegalStateException if this authentication exchange has not completed
*/
public Object getNegotiatedProperty(String propName) {
return null;
}
/**
* Disposes of any system resources or security-sensitive information
* the SaslServer might be using. Invoking this method invalidates
* the SaslServer instance. This method is idempotent.
*
* @throws javax.security.sasl.SaslException
* If a problem was encountered while disposing
* the resources.
*/
public void dispose() throws SaslException {
completed = false;
}
}