/*
 * Copyright (c) 2005, 2017, 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.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

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;
import sun.security.jgss.LoginConfigImpl;

Since:1.6 Special callback handler used in JGSS for the HttpCaller.
/** * @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.
/** * 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; Authenticator auth; if (hci.authenticator != null) { auth = hci.authenticator; } else { auth = LoginConfigImpl.HTTP_USE_GLOBAL_CREDS ? Authenticator.getDefault() : null; } if (auth != null) { PasswordAuthentication passAuth = auth.requestPasswordAuthenticationInstance( 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"); } } } }