/*
* $Header: /home/cvs/jakarta-commons/httpclient/src/java/org/apache/commons/httpclient/auth/NTLMScheme.java,v 1.6.2.3 2004/02/22 18:21:15 olegk Exp $
* $Revision: 1.6.2.3 $
* $Date: 2004/02/22 18:21:15 $
*
* ====================================================================
*
* Copyright 2002-2004 The Apache Software Foundation
*
* 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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
* [Additional notices, if required by prior licensing conditions]
*
*/
package org.apache.commons.httpclient.auth;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.NTLM;
import org.apache.commons.httpclient.Credentials;
import org.apache.commons.httpclient.NTCredentials;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/** An implementation of the Microsoft proprietary NTLM authentication scheme. For a detailed
* explanation of the NTLM scheme please see <a href="http://davenport.sourceforge.net/ntlm.html">
* http://davenport.sourceforge.net/ntlm.html</a>.
*
* @author <a href="mailto:remm@apache.org">Remy Maucherat</a>
* @author Rodney Waldhoff
* @author <a href="mailto:jsdever@apache.org">Jeff Dever</a>
* @author Ortwin Gl�ck
* @author Sean C. Sullivan
* @author <a href="mailto:adrian@ephox.com">Adrian Sutton</a>
* @author <a href="mailto:mbowler@GargoyleSoftware.com">Mike Bowler</a>
* @author <a href="mailto:oleg@ural.ru">Oleg Kalnichevski</a>
*/
public class NTLMScheme extends AuthSchemeBase {
/** Log object for this class. */
private static final Log LOG = LogFactory.getLog(NTLMScheme.class);
/** NTLM challenge string. */
private String ntlmchallenge = null;
/**
* Constructor for the NTLM authentication scheme.
*
* @param challenge The authentication challenge
*
* @throws MalformedChallengeException is thrown if the authentication challenge
* is malformed
*/
public NTLMScheme(final String challenge) throws MalformedChallengeException {
super(challenge);
String s = AuthChallengeParser.extractScheme(challenge);
if (!s.equalsIgnoreCase(getSchemeName())) {
throw new MalformedChallengeException("Invalid NTLM challenge: " + challenge);
}
int i = challenge.indexOf(' ');
if (i != -1) {
s = challenge.substring(i, challenge.length());
this.ntlmchallenge = s.trim();
} else {
this.ntlmchallenge = "";
}
}
/**
* Returns textual designation of the NTLM authentication scheme.
*
* @return <code>ntlm</code>
*/
public String getSchemeName() {
return "ntlm";
}
/**
* The concept of an authentication realm is not supported by the NTLM
* authentication scheme. Always returns <code>null</code>.
*
* @return <code>null</code>
*/
public String getRealm() {
return null;
}
/**
* Returns a String identifying the authentication challenge. This is
* used, in combination with the host and port to determine if
* authorization has already been attempted or not. Schemes which
* require multiple requests to complete the authentication should
* return a different value for each stage in the request.
*
* <p>Additionally, the ID should take into account any changes to the
* authentication challenge and return a different value when appropriate.
* For example when the realm changes in basic authentication it should be
* considered a different authentication attempt and a different value should
* be returned.</p>
*
* @return String a String identifying the authentication challenge. The
* returned value may be null.
*/
public String getID() {
return ntlmchallenge;
}
/**
* Returns the authentication parameter with the given name, if available.
*
* <p>There are no valid parameters for NTLM authentication so this method always returns
* <tt>null</tt>.</p>
*
* @param name The name of the parameter to be returned
*
* @return the parameter with the given name
*/
public String getParameter(String name) {
if (name == null) {
throw new IllegalArgumentException("Parameter name may not be null");
}
return null;
}
/**
* Create a NTLM authorization string for the given
* challenge and NT credentials.
*
* @param challenge The challenge.
* @param credentials {@link NTCredentials}
*
* @return a ntlm authorization string
* @throws AuthenticationException is thrown if authentication fails
*/
public static String authenticate(
final NTCredentials credentials, final String challenge)
throws AuthenticationException {
LOG.trace("enter NTLMScheme.authenticate(NTCredentials, String)");
if (credentials == null) {
throw new IllegalArgumentException("Credentials may not be null");
}
NTLM ntlm = new NTLM();
String s = null;
try {
s = ntlm.getResponseFor(challenge,
credentials.getUserName(), credentials.getPassword(),
credentials.getHost(), credentials.getDomain());
} catch (HttpException e) {
throw new AuthenticationException(e.getMessage());
}
return "NTLM " + s;
}
/**
* Produces NTLM authorization string for the given set of
* {@link Credentials}.
*
* @param credentials The set of credentials to be used for athentication
* @param method Method name is ignored by the NTLM authentication scheme
* @param uri URI is ignored by the NTLM authentication scheme
* @throws AuthenticationException if authorization string cannot
* be generated due to an authentication failure
*
* @return an NTLM authorization string
*/
public String authenticate(Credentials credentials, String method, String uri)
throws AuthenticationException {
LOG.trace("enter NTLMScheme.authenticate(Credentials, String, String)");
NTCredentials ntcredentials = null;
try {
ntcredentials = (NTCredentials) credentials;
} catch (ClassCastException e) {
throw new AuthenticationException(
"Credentials cannot be used for NTLM authentication: "
+ credentials.getClass().getName());
}
return NTLMScheme.authenticate(ntcredentials, this.ntlmchallenge);
}
}