/*
* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
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package sun.net.www.protocol.http.spnego;
import java.io.IOException;
import java.net.Authenticator;
import java.net.PasswordAuthentication;
import java.util.Arrays;
import javax.security.auth.callback.Callback;
import javax.security.auth.callback.CallbackHandler;
import javax.security.auth.callback.NameCallback;
import javax.security.auth.callback.PasswordCallback;
import javax.security.auth.callback.UnsupportedCallbackException;
import sun.net.www.protocol.http.HttpCallerInfo;
/**
* @since 1.6
* Special callback handler used in JGSS for the HttpCaller.
*/
public class NegotiateCallbackHandler implements CallbackHandler {
private String username;
private char[] password;
/**
* Authenticator asks for username and password in a single prompt,
* but CallbackHandler checks one by one. So, no matter which callback
* gets handled first, make sure Authenticator is only called once.
*/
private boolean answered;
private final HttpCallerInfo hci;
public NegotiateCallbackHandler(HttpCallerInfo hci) {
this.hci = hci;
}
private void getAnswer() {
if (!answered) {
answered = true;
PasswordAuthentication passAuth =
Authenticator.requestPasswordAuthentication(
hci.host, hci.addr, hci.port, hci.protocol,
hci.prompt, hci.scheme, hci.url, hci.authType);
/**
* To be compatible with existing callback handler implementations,
* when the underlying Authenticator is canceled, username and
* password are assigned null. No exception is thrown.
*/
if (passAuth != null) {
username = passAuth.getUserName();
password = passAuth.getPassword();
}
}
}
public void handle(Callback[] callbacks) throws
UnsupportedCallbackException, IOException {
for (int i=0; i<callbacks.length; i++) {
Callback callBack = callbacks[i];
if (callBack instanceof NameCallback) {
getAnswer();
((NameCallback)callBack).setName(username);
} else if (callBack instanceof PasswordCallback) {
getAnswer();
((PasswordCallback)callBack).setPassword(password);
if (password != null) Arrays.fill(password, ' ');
} else {
throw new UnsupportedCallbackException(callBack,
"Call back not supported");
}
}
}
}