722 lines
26 KiB
Java
722 lines
26 KiB
Java
/*
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* Copyright (c) 2008, 2022, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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import com.sun.security.auth.module.Krb5LoginModule;
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import java.io.IOException;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Method;
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import java.util.Arrays;
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import java.util.HashMap;
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import java.util.Map;
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import javax.security.auth.Subject;
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import javax.security.auth.callback.Callback;
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import javax.security.auth.callback.CallbackHandler;
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import javax.security.auth.callback.NameCallback;
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import javax.security.auth.callback.PasswordCallback;
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import javax.security.auth.callback.UnsupportedCallbackException;
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import javax.security.auth.kerberos.KerberosKey;
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import javax.security.auth.kerberos.KerberosTicket;
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import javax.security.auth.login.LoginContext;
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import org.ietf.jgss.GSSContext;
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import org.ietf.jgss.GSSCredential;
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import org.ietf.jgss.GSSException;
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import org.ietf.jgss.GSSManager;
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import org.ietf.jgss.GSSName;
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import org.ietf.jgss.MessageProp;
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import org.ietf.jgss.Oid;
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import sun.security.jgss.krb5.Krb5Util;
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import sun.security.krb5.Credentials;
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import sun.security.krb5.internal.ccache.CredentialsCache;
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import java.io.ByteArrayInputStream;
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import java.io.ByteArrayOutputStream;
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import java.security.Principal;
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import java.util.Set;
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import java.util.concurrent.Callable;
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import java.util.concurrent.CompletionException;
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/**
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* Context of a JGSS subject, encapsulating Subject and GSSContext.
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*
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* Three "constructors", which acquire the (private) credentials and fill
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* it into the Subject:
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*
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* 1. static fromJAAS(): Creates a Context using a JAAS login config entry
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* 2. static fromUserPass(): Creates a Context using a username and a password
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* 3. delegated(): A new context which uses the delegated credentials from a
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* previously established acceptor Context
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*
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* Two context initiators, which create the GSSContext object inside:
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*
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* 1. startAsClient()
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* 2. startAsServer()
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*
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* Privileged action:
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* doAs(): Performs an action in the name of the Subject
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*
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* Handshake process:
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* static handShake(initiator, acceptor)
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*
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* A four-phase typical data communication which includes all four GSS
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* actions (wrap, unwrap, getMic and veryfyMiC):
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* static transmit(message, from, to)
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*/
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public class Context {
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private Subject s;
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private GSSContext x;
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private String name;
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private GSSCredential cred; // see static method delegated().
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static boolean usingStream = false;
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private Context() {}
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/**
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* Using the delegated credentials from a previous acceptor
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*/
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public Context delegated() throws Exception {
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Context out = new Context();
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out.s = s;
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try {
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out.cred = Subject.callAs(s, new Callable<GSSCredential>() {
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@Override
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public GSSCredential call() throws Exception {
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GSSCredential cred = x.getDelegCred();
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if (cred == null && x.getCredDelegState() ||
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cred != null && !x.getCredDelegState()) {
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throw new Exception("getCredDelegState not match");
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}
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return cred;
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}
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});
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} catch (CompletionException ce) {
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throw (Exception) ce.getCause();
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}
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out.name = name + " as " + out.cred.getName().toString();
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return out;
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}
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/**
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* No JAAS login at all, can be used to test JGSS without JAAS
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*/
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public static Context fromThinAir() throws Exception {
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Context out = new Context();
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out.s = new Subject();
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return out;
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}
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/**
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* Logins with a JAAS login config entry name
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*/
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public static Context fromJAAS(final String name) throws Exception {
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Context out = new Context();
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out.name = name;
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LoginContext lc = new LoginContext(name);
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lc.login();
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out.s = lc.getSubject();
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return out;
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}
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/**
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* Logins with username/password as a new Subject
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*/
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public static Context fromUserPass(
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String user, char[] pass, boolean storeKey) throws Exception {
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return fromUserPass(new Subject(), user, pass, storeKey);
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}
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/**
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* Logins with username/password as an existing Subject. The
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* same subject can be used multiple times to simulate multiple logins.
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*/
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public static Context fromUserPass(Subject s,
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String user, char[] pass, boolean storeKey) throws Exception {
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Context out = new Context();
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out.name = user;
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out.s = s;
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Krb5LoginModule krb5 = new Krb5LoginModule();
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Map<String, String> map = new HashMap<>();
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Map<String, Object> shared = new HashMap<>();
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if (storeKey) {
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map.put("storeKey", "true");
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}
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if (pass != null) {
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krb5.initialize(out.s, new CallbackHandler() {
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@Override
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public void handle(Callback[] callbacks)
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throws IOException, UnsupportedCallbackException {
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for (Callback cb: callbacks) {
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if (cb instanceof NameCallback) {
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((NameCallback)cb).setName(user);
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} else if (cb instanceof PasswordCallback) {
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((PasswordCallback)cb).setPassword(pass);
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}
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}
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}
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}, shared, map);
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} else {
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map.put("doNotPrompt", "true");
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map.put("useTicketCache", "true");
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if (user != null) {
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map.put("principal", user);
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}
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krb5.initialize(out.s, null, shared, map);
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}
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krb5.login();
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krb5.commit();
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return out;
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}
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/**
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* Logins with username/keytab as an existing Subject. The
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* same subject can be used multiple times to simulate multiple logins.
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*/
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public static Context fromUserKtab(
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String user, String ktab, boolean storeKey) throws Exception {
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return fromUserKtab(new Subject(), user, ktab, storeKey);
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}
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/**
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* Logins with username/keytab as a new subject,
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*/
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public static Context fromUserKtab(Subject s,
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String user, String ktab, boolean storeKey) throws Exception {
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return fromUserKtab(s, user, ktab, false, storeKey);
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}
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/**
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* Logins with username/keytab as a client.
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*/
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public static Context fromUserKtabAsClient(
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String user, String ktab, boolean storeKey) throws Exception {
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return fromUserKtab(new Subject(), user, ktab, true, storeKey);
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}
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private static Context fromUserKtab(Subject s,
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String user, String ktab, boolean isInitiator, boolean storeKey) throws Exception {
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Context out = new Context();
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out.name = user;
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out.s = s;
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Krb5LoginModule krb5 = new Krb5LoginModule();
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Map<String, String> map = new HashMap<>();
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map.put("isInitiator", Boolean.toString(isInitiator));
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map.put("doNotPrompt", "true");
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map.put("useTicketCache", "false");
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map.put("useKeyTab", "true");
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map.put("keyTab", ktab);
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map.put("principal", user);
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if (storeKey) {
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map.put("storeKey", "true");
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}
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krb5.initialize(out.s, null, null, map);
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krb5.login();
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krb5.commit();
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return out;
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}
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/**
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* Starts as a client
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* @param target communication peer
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* @param mech GSS mech
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* @throws java.lang.Exception
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*/
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public void startAsClient(final String target, final Oid mech) throws Exception {
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doAs(new Action() {
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@Override
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public byte[] run(Context me, byte[] dummy) throws Exception {
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GSSManager m = GSSManager.getInstance();
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me.x = m.createContext(
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target.indexOf('@') < 0 ?
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m.createName(target, null) :
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m.createName(target, GSSName.NT_HOSTBASED_SERVICE),
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mech,
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cred,
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GSSContext.DEFAULT_LIFETIME);
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return null;
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}
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}, null);
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}
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/**
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* Starts as a server
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* @param mech GSS mech
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* @throws java.lang.Exception
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*/
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public void startAsServer(final Oid mech) throws Exception {
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startAsServer(null, mech, false);
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}
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public void startAsServer(final String name, final Oid mech) throws Exception {
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startAsServer(name, mech, false);
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}
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/**
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* Starts as a server with the specified service name
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* @param name the service name
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* @param mech GSS mech
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* @throws java.lang.Exception
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*/
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public void startAsServer(final String name, final Oid mech, final boolean asInitiator) throws Exception {
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doAs(new Action() {
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@Override
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public byte[] run(Context me, byte[] dummy) throws Exception {
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GSSManager m = GSSManager.getInstance();
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me.cred = m.createCredential(
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name == null ? null :
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(name.indexOf('@') < 0 ?
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m.createName(name, null) :
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m.createName(name, GSSName.NT_HOSTBASED_SERVICE)),
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GSSCredential.INDEFINITE_LIFETIME,
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mech,
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asInitiator?
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GSSCredential.INITIATE_AND_ACCEPT:
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GSSCredential.ACCEPT_ONLY);
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me.x = m.createContext(me.cred);
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return null;
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}
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}, null);
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}
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/**
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* Accesses the internal GSSContext object. Currently it's used for --
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*
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* 1. calling requestXXX() before handshake
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* 2. accessing source name
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*
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* Note: If the application needs to do any privileged call on this
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* object, please use doAs(). Otherwise, it can be done directly. The
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* methods listed above are all non-privileged calls.
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*
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* @return the GSSContext object
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*/
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public GSSContext x() {
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return x;
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}
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/**
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* Accesses the internal subject.
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* @return the subject
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*/
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public Subject s() {
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return s;
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}
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/**
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* Returns the cred inside, if there is one
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*/
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public GSSCredential cred() {
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return cred;
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}
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/**
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* Disposes the GSSContext within
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* @throws org.ietf.jgss.GSSException
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*/
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public void dispose() throws GSSException {
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x.dispose();
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}
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/**
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* Does something using the Subject inside
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* @param action the action
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* @param in the input byte
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* @return the output byte
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* @throws java.lang.Exception
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*/
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public byte[] doAs(final Action action, final byte[] in) throws Exception {
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try {
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return Subject.callAs(s, new Callable<byte[]>() {
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@Override
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public byte[] call() throws Exception {
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return action.run(Context.this, in);
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}
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});
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} catch (CompletionException ce) {
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throw (Exception) ce.getCause();
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}
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}
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/**
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* Prints status of GSSContext and Subject
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* @throws java.lang.Exception
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*/
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public void status() throws Exception {
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System.out.println("STATUS OF " + name.toUpperCase());
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if (x != null) {
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StringBuffer sb = new StringBuffer();
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if (x.getAnonymityState()) {
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sb.append("anon, ");
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}
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if (x.getConfState()) {
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sb.append("conf, ");
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}
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if (x.getCredDelegState()) {
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sb.append("deleg, ");
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}
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if (x.getIntegState()) {
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sb.append("integ, ");
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}
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if (x.getMutualAuthState()) {
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sb.append("mutual, ");
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}
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if (x.getReplayDetState()) {
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sb.append("rep det, ");
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}
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if (x.getSequenceDetState()) {
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sb.append("seq det, ");
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}
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System.out.println(" Context status of " + name + ": " + sb.toString());
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if (x.isProtReady() || x.isEstablished()) {
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System.out.println(" " + x.getSrcName() + " -> " + x.getTargName());
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}
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}
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xstatus();
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if (s != null) {
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System.out.println("====== START SUBJECT CONTENT =====");
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for (Principal p : s.getPrincipals()) {
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System.out.println(" Principal: " + p);
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}
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for (Object o : s.getPublicCredentials()) {
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System.out.println(" " + o.getClass());
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System.out.println(" " + o);
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}
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System.out.println("====== Private Credentials Set ======");
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for (Object o : s.getPrivateCredentials()) {
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System.out.println(" " + o.getClass());
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if (o instanceof KerberosTicket) {
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KerberosTicket kt = (KerberosTicket) o;
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System.out.println(" " + kt.getServer() + " for " + kt.getClient());
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} else if (o instanceof KerberosKey) {
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KerberosKey kk = (KerberosKey) o;
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System.out.print(" " + kk.getKeyType() + " " + kk.getVersionNumber() + " " + kk.getAlgorithm() + " ");
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for (byte b : kk.getEncoded()) {
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System.out.printf("%02X", b & 0xff);
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}
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System.out.println();
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} else if (o instanceof Map) {
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Map map = (Map) o;
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for (Object k : map.keySet()) {
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System.out.println(" " + k + ": " + map.get(k));
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}
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} else {
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System.out.println(" " + o);
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}
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}
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System.out.println("====== END SUBJECT CONTENT =====");
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}
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}
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public void xstatus() throws Exception {
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System.out.println(" Extended context status:");
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if (x != null) {
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try {
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Class<?> clazz = Class.forName("com.sun.security.jgss.ExtendedGSSContext");
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if (clazz.isAssignableFrom(x.getClass())) {
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if (clazz.getMethod("getDelegPolicyState").invoke(x) == Boolean.TRUE) {
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System.out.println(" deleg policy");
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}
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if (x.isEstablished()) {
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Class<?> inqType = Class.forName("com.sun.security.jgss.InquireType");
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Method inqMethod = clazz.getMethod("inquireSecContext", inqType);
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for (Object o : inqType.getEnumConstants()) {
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System.out.println(" " + o + ":");
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try {
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System.out.println(" " + inqMethod.invoke(x, o));
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} catch (Exception e) {
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System.out.println(e.getCause());
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}
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}
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}
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}
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} catch (ClassNotFoundException cnfe) {
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System.out.println(" -- ExtendedGSSContext not available");
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}
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}
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if (cred != null) {
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try {
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Class<?> clazz2 = Class.forName("com.sun.security.jgss.ExtendedGSSCredential");
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if (!clazz2.isAssignableFrom(cred.getClass())) {
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throw new Exception("cred is not extended");
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}
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} catch (ClassNotFoundException cnfe) {
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System.out.println(" -- ExtendedGSSCredential not available");
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}
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}
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}
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public byte[] wrap(byte[] t, final boolean privacy)
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throws Exception {
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return doAs(new Action() {
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@Override
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public byte[] run(Context me, byte[] input) throws Exception {
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System.out.printf("wrap %s privacy from %s: ", privacy?"with":"without", me.name);
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MessageProp p1 = new MessageProp(0, privacy);
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byte[] out;
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if (usingStream) {
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ByteArrayOutputStream os = new ByteArrayOutputStream();
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me.x.wrap(new ByteArrayInputStream(input), os, p1);
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out = os.toByteArray();
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} else {
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out = me.x.wrap(input, 0, input.length, p1);
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}
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System.out.println(printProp(p1));
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if ((x.getConfState() && privacy) != p1.getPrivacy()) {
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throw new Exception("unexpected privacy status");
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}
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return out;
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}
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}, t);
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}
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public byte[] unwrap(byte[] t, final boolean privacyExpected)
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throws Exception {
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return doAs(new Action() {
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@Override
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public byte[] run(Context me, byte[] input) throws Exception {
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System.out.printf("unwrap from %s", me.name);
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MessageProp p1 = new MessageProp(0, true);
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byte[] bytes;
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if (usingStream) {
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ByteArrayOutputStream os = new ByteArrayOutputStream();
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me.x.unwrap(new ByteArrayInputStream(input), os, p1);
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bytes = os.toByteArray();
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} else {
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bytes = me.x.unwrap(input, 0, input.length, p1);
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}
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System.out.println(printProp(p1));
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if (p1.getPrivacy() != privacyExpected) {
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throw new Exception("Unexpected privacy: " + p1.getPrivacy());
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}
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return bytes;
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}
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}, t);
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}
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public byte[] getMic(byte[] t) throws Exception {
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return doAs(new Action() {
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@Override
|
|
public byte[] run(Context me, byte[] input) throws Exception {
|
|
MessageProp p1 = new MessageProp(0, true);
|
|
byte[] bytes;
|
|
p1 = new MessageProp(0, true);
|
|
System.out.printf("getMic from %s: ", me.name);
|
|
if (usingStream) {
|
|
ByteArrayOutputStream os = new ByteArrayOutputStream();
|
|
me.x.getMIC(new ByteArrayInputStream(input), os, p1);
|
|
bytes = os.toByteArray();
|
|
} else {
|
|
bytes = me.x.getMIC(input, 0, input.length, p1);
|
|
}
|
|
System.out.println(printProp(p1));
|
|
return bytes;
|
|
}
|
|
}, t);
|
|
}
|
|
|
|
public void verifyMic(byte[] t, final byte[] msg) throws Exception {
|
|
doAs(new Action() {
|
|
@Override
|
|
public byte[] run(Context me, byte[] input) throws Exception {
|
|
MessageProp p1 = new MessageProp(0, true);
|
|
System.out.printf("verifyMic from %s: ", me.name);
|
|
if (usingStream) {
|
|
me.x.verifyMIC(new ByteArrayInputStream(input),
|
|
new ByteArrayInputStream(msg), p1);
|
|
} else {
|
|
me.x.verifyMIC(input, 0, input.length,
|
|
msg, 0, msg.length,
|
|
p1);
|
|
}
|
|
System.out.println(printProp(p1));
|
|
if (p1.isUnseqToken() || p1.isOldToken()
|
|
|| p1.isDuplicateToken() || p1.isGapToken()) {
|
|
throw new Exception("Wrong sequence number detected");
|
|
}
|
|
return null;
|
|
}
|
|
}, t);
|
|
}
|
|
|
|
/**
|
|
* Transmits a message from one Context to another. The sender wraps the
|
|
* message and sends it to the receiver. The receiver unwraps it, creates
|
|
* a MIC of the clear text and sends it back to the sender. The sender
|
|
* verifies the MIC against the message sent earlier.
|
|
* @param message the message
|
|
* @param s1 the sender
|
|
* @param s2 the receiver
|
|
* @throws java.lang.Exception If anything goes wrong
|
|
*/
|
|
static public void transmit(String message, final Context s1,
|
|
final Context s2) throws Exception {
|
|
transmit(message.getBytes(), s1, s2);
|
|
}
|
|
|
|
/**
|
|
* Transmits a message from one Context to another. The sender wraps the
|
|
* message and sends it to the receiver. The receiver unwraps it, creates
|
|
* a MIC of the clear text and sends it back to the sender. The sender
|
|
* verifies the MIC against the message sent earlier.
|
|
* @param messageBytes the message
|
|
* @param s1 the sender
|
|
* @param s2 the receiver
|
|
* @throws java.lang.Exception If anything goes wrong
|
|
*/
|
|
static public void transmit(byte[] messageBytes, final Context s1,
|
|
final Context s2) throws Exception {
|
|
System.out.printf("-------------------- TRANSMIT from %s to %s------------------------\n",
|
|
s1.name, s2.name);
|
|
byte[] wrapped = s1.wrap(messageBytes, true);
|
|
byte[] unwrapped = s2.unwrap(wrapped, s2.x.getConfState());
|
|
if (!Arrays.equals(messageBytes, unwrapped)) {
|
|
throw new Exception("wrap/unwrap mismatch");
|
|
}
|
|
byte[] mic = s2.getMic(unwrapped);
|
|
s1.verifyMic(mic, messageBytes);
|
|
}
|
|
|
|
/**
|
|
* Returns a string description of a MessageProp object
|
|
* @param prop the object
|
|
* @return the description
|
|
*/
|
|
static public String printProp(MessageProp prop) {
|
|
StringBuffer sb = new StringBuffer();
|
|
sb.append("MessagePop: ");
|
|
sb.append("QOP="+ prop.getQOP() + ", ");
|
|
sb.append(prop.getPrivacy()?"privacy, ":"");
|
|
sb.append(prop.isDuplicateToken()?"dup, ":"");
|
|
sb.append(prop.isGapToken()?"gap, ":"");
|
|
sb.append(prop.isOldToken()?"old, ":"");
|
|
sb.append(prop.isUnseqToken()?"unseq, ":"");
|
|
if (prop.getMinorStatus() != 0) {
|
|
sb.append(prop.getMinorString()+ "(" + prop.getMinorStatus()+")");
|
|
}
|
|
return sb.toString();
|
|
}
|
|
|
|
public Context impersonate(final String someone) throws Exception {
|
|
try {
|
|
GSSCredential creds = Subject.callAs(s, new Callable<GSSCredential>() {
|
|
@Override
|
|
public GSSCredential call() throws Exception {
|
|
GSSManager m = GSSManager.getInstance();
|
|
GSSName other = m.createName(someone, GSSName.NT_USER_NAME);
|
|
if (Context.this.cred == null) {
|
|
Context.this.cred = m.createCredential(GSSCredential.INITIATE_ONLY);
|
|
}
|
|
return (GSSCredential)
|
|
Class.forName("com.sun.security.jgss.ExtendedGSSCredential")
|
|
.getMethod("impersonate", GSSName.class)
|
|
.invoke(Context.this.cred, other);
|
|
}
|
|
});
|
|
Context out = new Context();
|
|
out.s = s;
|
|
out.cred = creds;
|
|
out.name = name + " as " + out.cred.getName().toString();
|
|
return out;
|
|
} catch (CompletionException ce) {
|
|
Exception e = (Exception) ce.getCause();
|
|
if (e instanceof InvocationTargetException) {
|
|
throw (Exception)((InvocationTargetException) e).getTargetException();
|
|
} else {
|
|
throw e;
|
|
}
|
|
}
|
|
}
|
|
|
|
public byte[] take(final byte[] in) throws Exception {
|
|
return doAs(new Action() {
|
|
@Override
|
|
public byte[] run(Context me, byte[] input) throws Exception {
|
|
if (me.x.isEstablished()) {
|
|
System.out.println(name + " side established");
|
|
if (input != null) {
|
|
throw new Exception("Context established but " +
|
|
"still receive token at " + name);
|
|
}
|
|
return null;
|
|
} else {
|
|
if (me.x.isInitiator()) {
|
|
System.out.println(name + " call initSecContext");
|
|
return me.x.initSecContext(input, 0, input.length);
|
|
} else {
|
|
System.out.println(name + " call acceptSecContext");
|
|
return me.x.acceptSecContext(input, 0, input.length);
|
|
}
|
|
}
|
|
}
|
|
}, in);
|
|
}
|
|
|
|
/**
|
|
* Saves the tickets to a ccache file.
|
|
*
|
|
* @param file pathname of the ccache file
|
|
* @return true if created, false otherwise.
|
|
*/
|
|
public boolean ccache(String file) throws Exception {
|
|
Set<KerberosTicket> tickets
|
|
= s.getPrivateCredentials(KerberosTicket.class);
|
|
if (tickets != null && !tickets.isEmpty()) {
|
|
CredentialsCache cc = null;
|
|
for (KerberosTicket t : tickets) {
|
|
Credentials cred = Krb5Util.ticketToCreds(t);
|
|
if (cc == null) {
|
|
cc = CredentialsCache.create(cred.getClient(), file);
|
|
}
|
|
cc.update(cred.toCCacheCreds());
|
|
}
|
|
if (cc != null) {
|
|
cc.save();
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Handshake (security context establishment process) between two Contexts
|
|
* @param c the initiator
|
|
* @param s the acceptor
|
|
* @throws java.lang.Exception
|
|
*/
|
|
static public void handshake(final Context c, final Context s) throws Exception {
|
|
byte[] t = new byte[0];
|
|
while (true) {
|
|
if (t != null || !c.x.isEstablished()) t = c.take(t);
|
|
if (t != null || !s.x.isEstablished()) t = s.take(t);
|
|
if (c.x.isEstablished() && s.x.isEstablished()) break;
|
|
}
|
|
}
|
|
}
|