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/*
* ====================================================================
*
* 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.
* ====================================================================
*
* 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/>.
*
*/
package ch.boye.httpclientandroidlib.impl.auth;
import ch.boye.httpclientandroidlib.annotation.NotThreadSafe;
import ch.boye.httpclientandroidlib.Header;
import ch.boye.httpclientandroidlib.HttpRequest;
import ch.boye.httpclientandroidlib.auth.AUTH;
import ch.boye.httpclientandroidlib.auth.AuthenticationException;
import ch.boye.httpclientandroidlib.auth.Credentials;
import ch.boye.httpclientandroidlib.auth.InvalidCredentialsException;
import ch.boye.httpclientandroidlib.auth.MalformedChallengeException;
import ch.boye.httpclientandroidlib.auth.NTCredentials;
import ch.boye.httpclientandroidlib.impl.auth.AuthSchemeBase;
import ch.boye.httpclientandroidlib.message.BufferedHeader;
import ch.boye.httpclientandroidlib.util.CharArrayBuffer;
/**
* NTLM is a proprietary authentication scheme developed by Microsoft
* and optimized for Windows platforms.
*
* @since 4.0
*/
@NotThreadSafe
public class NTLMScheme extends AuthSchemeBase {
enum State {
UNINITIATED,
CHALLENGE_RECEIVED,
MSG_TYPE1_GENERATED,
MSG_TYPE2_RECEVIED,
MSG_TYPE3_GENERATED,
FAILED,
}
private final NTLMEngine engine;
private State state;
private String challenge;
public NTLMScheme(final NTLMEngine engine) {
super();
if (engine == null) {
throw new IllegalArgumentException("NTLM engine may not be null");
}
this.engine = engine;
this.state = State.UNINITIATED;
this.challenge = null;
}
public String getSchemeName() {
return "ntlm";
}
public String getParameter(String name) {
// String parameters not supported
return null;
}
public String getRealm() {
// NTLM does not support the concept of an authentication realm
return null;
}
public boolean isConnectionBased() {
return true;
}
@Override
protected void parseChallenge(
final CharArrayBuffer buffer,
int beginIndex, int endIndex) throws MalformedChallengeException {
String challenge = buffer.substringTrimmed(beginIndex, endIndex);
if (challenge.length() == 0) {
if (this.state == State.UNINITIATED) {
this.state = State.CHALLENGE_RECEIVED;
} else {
this.state = State.FAILED;
}
this.challenge = null;
} else {
this.state = State.MSG_TYPE2_RECEVIED;
this.challenge = challenge;
}
}
public Header authenticate(
final Credentials credentials,
final HttpRequest request) throws AuthenticationException {
NTCredentials ntcredentials = null;
try {
ntcredentials = (NTCredentials) credentials;
} catch (ClassCastException e) {
throw new InvalidCredentialsException(
"Credentials cannot be used for NTLM authentication: "
+ credentials.getClass().getName());
}
String response = null;
if (this.state == State.CHALLENGE_RECEIVED || this.state == State.FAILED) {
response = this.engine.generateType1Msg(
ntcredentials.getDomain(),
ntcredentials.getWorkstation());
this.state = State.MSG_TYPE1_GENERATED;
} else if (this.state == State.MSG_TYPE2_RECEVIED) {
response = this.engine.generateType3Msg(
ntcredentials.getUserName(),
ntcredentials.getPassword(),
ntcredentials.getDomain(),
ntcredentials.getWorkstation(),
this.challenge);
this.state = State.MSG_TYPE3_GENERATED;
} else {
throw new AuthenticationException("Unexpected state: " + this.state);
}
CharArrayBuffer buffer = new CharArrayBuffer(32);
if (isProxy()) {
buffer.append(AUTH.PROXY_AUTH_RESP);
} else {
buffer.append(AUTH.WWW_AUTH_RESP);
}
buffer.append(": NTLM ");
buffer.append(response);
return new BufferedHeader(buffer);
}
public boolean isComplete() {
return this.state == State.MSG_TYPE3_GENERATED || this.state == State.FAILED;
}
}
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