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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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* 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).
*
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* 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 com.sun.jndi.ldap.sasl;
import javax.security.auth.callback.*;
import javax.security.sasl.RealmCallback;
import javax.security.sasl.RealmChoiceCallback;
import java.io.IOException;
/**
* DefaultCallbackHandler for satisfying NameCallback and
* PasswordCallback for an LDAP client.
* NameCallback is used for getting the authentication ID and is
* gotten from the java.naming.security.principal property.
* PasswordCallback is gotten from the java.naming.security.credentials
* property and must be of type String, char[] or byte[].
* If byte[], it is assumed to have UTF-8 encoding.
*
* If the caller of getPassword() will be using the password as
* a byte array, then it should encode the char[] array returned by
* getPassword() into a byte[] using UTF-8.
*
* @author Rosanna Lee
*/
final class DefaultCallbackHandler implements CallbackHandler {
private char[] passwd;
private String authenticationID;
private String authRealm;
DefaultCallbackHandler(String principal, Object cred, String realm)
throws IOException {
authenticationID = principal;
authRealm = realm;
if (cred instanceof String) {
passwd = ((String)cred).toCharArray();
} else if (cred instanceof char[]) {
passwd = (char[])((char[])cred).clone();
} else if (cred != null) {
// assume UTF-8 encoding
String orig = new String((byte[])cred, "UTF8");
passwd = orig.toCharArray();
}
}
public void handle(Callback[] callbacks)
throws IOException, UnsupportedCallbackException {
for (int i = 0; i < callbacks.length; i++) {
if (callbacks[i] instanceof NameCallback) {
((NameCallback)callbacks[i]).setName(authenticationID);
} else if (callbacks[i] instanceof PasswordCallback) {
((PasswordCallback)callbacks[i]).setPassword(passwd);
} else if (callbacks[i] instanceof RealmChoiceCallback) {
/* Deals with a choice of realms */
String[] choices =
((RealmChoiceCallback)callbacks[i]).getChoices();
int selected = 0;
if (authRealm != null && authRealm.length() > 0) {
selected = -1; // no realm chosen
for (int j = 0; j < choices.length; j++) {
if (choices[j].equals(authRealm)) {
selected = j;
}
}
if (selected == -1) {
StringBuffer allChoices = new StringBuffer();
for (int j = 0; j < choices.length; j++) {
allChoices.append(choices[j] + ",");
}
throw new IOException("Cannot match " +
"'java.naming.security.sasl.realm' property value, '" +
authRealm + "' with choices " + allChoices +
"in RealmChoiceCallback");
}
}
((RealmChoiceCallback)callbacks[i]).setSelectedIndex(selected);
} else if (callbacks[i] instanceof RealmCallback) {
/* 1 or 0 realms specified in challenge */
RealmCallback rcb = (RealmCallback) callbacks[i];
if (authRealm != null) {
rcb.setText(authRealm); // Use what user supplied
} else {
String defaultRealm = rcb.getDefaultText();
if (defaultRealm != null) {
rcb.setText(defaultRealm); // Use what server supplied
} else {
rcb.setText(""); // Specify no realm
}
}
} else {
throw new UnsupportedCallbackException(callbacks[i]);
}
}
}
void clearPassword() {
if (passwd != null) {
for (int i = 0; i < passwd.length; i++) {
passwd[i] = '\0';
}
passwd = null;
}
}
protected void finalize() throws Throwable {
clearPassword();
}
}