/*
* Copyright (c) 2008, 2011, 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.
*
* 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.
*/
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.security.Security;
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 sun.security.krb5.Config;
/**
* This class starts a simple KDC with one realm, several typical principal
* names, generates delete-on-exit krb5.conf and keytab files, and setup
* system properties for them. There's also a helper method to generate a
* JAAS login config file that can be used for JAAS or JGSS apps.
* <p>
* Just call this line to start everything:
* <pre>
* new OneKDC(null).writeJaasConf();
* </pre>
*/
public class OneKDC extends KDC {
public static final String USER = "dummy";
public static final char[] PASS = "bogus".toCharArray();
public static final String USER2 = "foo";
public static final char[] PASS2 = "bar".toCharArray();
public static final String KRB5_CONF = "localkdc-krb5.conf";
public static final String KTAB = "localkdc.ktab";
public static final String JAAS_CONF = "localkdc-jaas.conf";
public static final String REALM = "RABBIT.HOLE";
public static String SERVER = "server/host." + REALM.toLowerCase();
public static String BACKEND = "backend/host." + REALM.toLowerCase();
public static String KDCHOST = "kdc." + REALM.toLowerCase();
/**
* Creates the KDC and starts it.
* @param etype Encryption type, null if not specified
* @throws java.lang.Exception if there's anything wrong
*/
public OneKDC(String etype) throws Exception {
super(REALM, KDCHOST, 0, true);
addPrincipal(USER, PASS);
addPrincipal(USER2, PASS2);
addPrincipalRandKey("krbtgt/" + REALM);
addPrincipalRandKey(SERVER);
addPrincipalRandKey(BACKEND);
String extraConfig = "";
if (etype != null) {
extraConfig += "default_tkt_enctypes=" + etype
+ "\ndefault_tgs_enctypes=" + etype;
if (etype.startsWith("des")) {
extraConfig += "\nallow_weak_crypto = true";
}
}
KDC.saveConfig(KRB5_CONF, this,
"forwardable = true",
"default_keytab_name = " + KTAB,
extraConfig);
System.setProperty("java.security.krb5.conf", KRB5_CONF);
// Whatever krb5.conf had been loaded before, we reload ours now.
Config.refresh();
writeKtab(KTAB);
Security.setProperty("auth.login.defaultCallbackHandler",
"OneKDC$CallbackForClient");
}
/**
* Writes a JAAS login config file, which contains as many as useful
* entries, including JGSS style initiator/acceptor and normal JAAS
* entries with names using existing OneKDC principals.
* @throws java.lang.Exception if anything goes wrong
*/
public void writeJAASConf() throws IOException {
System.setProperty("java.security.auth.login.config", JAAS_CONF);
File f = new File(JAAS_CONF);
FileOutputStream fos = new FileOutputStream(f);
fos.write((
"com.sun.security.jgss.krb5.initiate {\n" +
" com.sun.security.auth.module.Krb5LoginModule required;\n};\n" +
"com.sun.security.jgss.krb5.accept {\n" +
" com.sun.security.auth.module.Krb5LoginModule required\n" +
" principal=\"*\"\n" +
" useKeyTab=true\n" +
" isInitiator=false\n" +
" storeKey=true;\n};\n" +
"client {\n" +
" com.sun.security.auth.module.Krb5LoginModule required;\n};\n" +
"server {\n" +
" com.sun.security.auth.module.Krb5LoginModule required\n" +
" principal=\"" + SERVER + "\"\n" +
" useKeyTab=true\n" +
" storeKey=true;\n};\n" +
"backend {\n" +
" com.sun.security.auth.module.Krb5LoginModule required\n" +
" principal=\"" + BACKEND + "\"\n" +
" useKeyTab=true\n" +
" storeKey=true\n" +
" isInitiator=false;\n};\n"
).getBytes());
fos.close();
}
/**
* The default callback handler for JAAS login. Note that this handler is
* hard coded to provide only info for USER1. If you need to provide info
* for another principal, please use Context.fromUserPass() instead.
*/
public static class CallbackForClient implements CallbackHandler {
public void handle(Callback[] callbacks) {
String user = OneKDC.USER;
char[] pass = OneKDC.PASS;
for (Callback callback : callbacks) {
if (callback instanceof NameCallback) {
System.out.println("Callback for name: " + user);
((NameCallback) callback).setName(user);
}
if (callback instanceof PasswordCallback) {
System.out.println("Callback for pass: "
+ new String(pass));
((PasswordCallback) callback).setPassword(pass);
}
}
}
}
}