1 /*
2 * Copyright (c) 2008, 2011, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 import java.io.File;
25 import java.io.FileOutputStream;
26 import java.io.IOException;
27 import java.security.Security;
28 import javax.security.auth.callback.Callback;
29 import javax.security.auth.callback.CallbackHandler;
30 import javax.security.auth.callback.NameCallback;
31 import javax.security.auth.callback.PasswordCallback;
32 import sun.security.krb5.Config;
33
34 /**
35 * This class starts a simple KDC with one realm, several typical principal
36 * names, generates delete-on-exit krb5.conf and keytab files, and setup
37 * system properties for them. There's also a helper method to generate a
38 * JAAS login config file that can be used for JAAS or JGSS apps.
39 * <p>
40 * Just call this line to start everything:
41 * <pre>
42 * new OneKDC(null).writeJaasConf();
43 * </pre>
44 */
45 public class OneKDC extends KDC {
46
47 public static final String USER = "dummy";
48 public static final char[] PASS = "bogus".toCharArray();
49 public static final String USER2 = "foo";
50 public static final char[] PASS2 = "bar".toCharArray();
51 public static final String KRB5_CONF = "localkdc-krb5.conf";
52 public static final String KTAB = "localkdc.ktab";
53 public static final String JAAS_CONF = "localkdc-jaas.conf";
54 public static final String REALM = "RABBIT.HOLE";
55 public static String SERVER = "server/host." + REALM.toLowerCase();
56 public static String BACKEND = "backend/host." + REALM.toLowerCase();
57 public static String KDCHOST = "kdc." + REALM.toLowerCase();
58 /**
59 * Creates the KDC and starts it.
60 * @param etype Encryption type, null if not specified
61 * @throws java.lang.Exception if there's anything wrong
62 */
63 public OneKDC(String etype) throws Exception {
64 super(REALM, KDCHOST, 0, true);
65 addPrincipal(USER, PASS);
66 addPrincipal(USER2, PASS2);
67 addPrincipalRandKey("krbtgt/" + REALM);
68 addPrincipalRandKey(SERVER);
69 addPrincipalRandKey(BACKEND);
70 KDC.saveConfig(KRB5_CONF, this,
71 "forwardable = true",
72 "default_keytab_name = " + KTAB,
73 etype == null ? "" : "default_tkt_enctypes=" + etype + "\ndefault_tgs_enctypes=" + etype);
74 System.setProperty("java.security.krb5.conf", KRB5_CONF);
75 // Whatever krb5.conf had been loaded before, we reload ours now.
76 Config.refresh();
77
78 writeKtab(KTAB);
79 Security.setProperty("auth.login.defaultCallbackHandler",
80 "OneKDC$CallbackForClient");
81 }
82
83 /**
84 * Writes a JAAS login config file, which contains as many as useful
85 * entries, including JGSS style initiator/acceptor and normal JAAS
86 * entries with names using existing OneKDC principals.
87 * @throws java.lang.Exception if anything goes wrong
88 */
89 public void writeJAASConf() throws IOException {
90 System.setProperty("java.security.auth.login.config", JAAS_CONF);
91 File f = new File(JAAS_CONF);
92 FileOutputStream fos = new FileOutputStream(f);
93 fos.write((
94 "com.sun.security.jgss.krb5.initiate {\n" +
95 " com.sun.security.auth.module.Krb5LoginModule required;\n};\n" +
96 "com.sun.security.jgss.krb5.accept {\n" +
97 " com.sun.security.auth.module.Krb5LoginModule required\n" +
98 " principal=\"*\"\n" +
99 " useKeyTab=true\n" +
100 " isInitiator=false\n" +
101 " storeKey=true;\n};\n" +
102 "client {\n" +
103 " com.sun.security.auth.module.Krb5LoginModule required;\n};\n" +
104 "server {\n" +
105 " com.sun.security.auth.module.Krb5LoginModule required\n" +
106 " principal=\"" + SERVER + "\"\n" +
107 " useKeyTab=true\n" +
108 " storeKey=true;\n};\n" +
109 "backend {\n" +
110 " com.sun.security.auth.module.Krb5LoginModule required\n" +
111 " principal=\"" + BACKEND + "\"\n" +
112 " useKeyTab=true\n" +
113 " storeKey=true\n" +
114 " isInitiator=false;\n};\n"
115 ).getBytes());
116 fos.close();
117 }
118
119 /**
120 * The default callback handler for JAAS login. Note that this handler is
121 * hard coded to provide only info for USER1. If you need to provide info
122 * for another principal, please use Context.fromUserPass() instead.
123 */
124 public static class CallbackForClient implements CallbackHandler {
125 public void handle(Callback[] callbacks) {
126 String user = OneKDC.USER;
127 char[] pass = OneKDC.PASS;
128 for (Callback callback : callbacks) {
129 if (callback instanceof NameCallback) {
130 System.out.println("Callback for name: " + user);
131 ((NameCallback) callback).setName(user);
132 }
133 if (callback instanceof PasswordCallback) {
134 System.out.println("Callback for pass: "
135 + new String(pass));
136 ((PasswordCallback) callback).setPassword(pass);
137 }
138 }
139 }
140 }
141 }