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/*
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* Copyright 2008 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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import com.sun.security.auth.module.Krb5LoginModule;
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import java.security.PrivilegedActionException;
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import java.security.PrivilegedExceptionAction;
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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.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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/**
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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 boolean f; // context established?
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private String name;
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private GSSCredential cred; // see static method delegated().
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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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* @param c
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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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out.cred = x.getDelegCred();
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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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* 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 a username and a password, using Krb5LoginModule directly
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* @param storeKey true if key should be saved, used on acceptor side
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*/
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public static Context fromUserPass(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 = new Subject();
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Krb5LoginModule krb5 = new Krb5LoginModule();
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Map<String, String> map = new HashMap<String, String>();
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map.put("tryFirstPass", "true");
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if (storeKey) {
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map.put("storeKey", "true");
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}
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Map<String, Object> shared = new HashMap<String, Object>();
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shared.put("javax.security.auth.login.name", user);
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shared.put("javax.security.auth.login.password", pass);
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krb5.initialize(out.s, null, shared, 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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f = false;
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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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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(m.createCredential(
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null,
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GSSCredential.INDEFINITE_LIFETIME,
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mech,
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GSSCredential.ACCEPT_ONLY));
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return null;
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}
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}, null);
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f = false;
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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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* 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.doAs(s, new PrivilegedExceptionAction<byte[]>() {
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@Override
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public byte[] run() 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 (PrivilegedActionException pae) {
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throw pae.getException();
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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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try {
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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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System.out.println(x.getSrcName() + " -> " + x.getTargName());
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} catch (Exception e) {
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;// Don't care
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}
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System.out.println("=====================================");
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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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}
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}
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}
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/**
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* Transmits a message from one Context to another. The sender wraps the
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* message and sends it to the receiver. The receiver unwraps it, creates
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* a MIC of the clear text and sends it back to the sender. The sender
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* verifies the MIC against the message sent earlier.
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* @param message the message
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* @param s1 the sender
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* @param s2 the receiver
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* @throws java.lang.Exception If anything goes wrong
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*/
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static public void transmit(final String message, final Context s1,
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final Context s2) throws Exception {
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final byte[] messageBytes = message.getBytes();
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System.out.printf("-------------------- TRANSMIT from %s to %s------------------------\n",
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s1.name, s2.name);
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byte[] t = s1.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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System.out.println("wrap");
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MessageProp p1 = new MessageProp(0, true);
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byte[] out = me.x.wrap(messageBytes, 0, messageBytes.length, p1);
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System.out.println(printProp(p1));
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return out;
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}
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}, null);
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t = s2.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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MessageProp p1 = new MessageProp(0, true);
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byte[] bytes = me.x.unwrap(input, 0, input.length, p1);
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if (!Arrays.equals(messageBytes, bytes))
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throw new Exception("wrap/unwrap mismatch");
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System.out.println("unwrap");
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System.out.println(printProp(p1));
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p1 = new MessageProp(0, true);
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System.out.println("getMIC");
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bytes = me.x.getMIC(bytes, 0, bytes.length, p1);
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System.out.println(printProp(p1));
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return bytes;
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}
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}, t);
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// Re-unwrap should make p2.isDuplicateToken() returns true
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s1.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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MessageProp p1 = new MessageProp(0, true);
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System.out.println("verifyMIC");
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me.x.verifyMIC(input, 0, input.length,
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messageBytes, 0, messageBytes.length,
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p1);
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System.out.println(printProp(p1));
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return null;
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}
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}, t);
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}
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/**
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* Returns a string description of a MessageProp object
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* @param prop the object
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* @return the description
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*/
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static public String printProp(MessageProp prop) {
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StringBuffer sb = new StringBuffer();
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sb.append("MessagePop: ");
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sb.append("QOP="+ prop.getQOP() + ", ");
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sb.append(prop.getPrivacy()?"privacy, ":"");
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sb.append(prop.isDuplicateToken()?"dup, ":"");
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sb.append(prop.isGapToken()?"gap, ":"");
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sb.append(prop.isOldToken()?"old, ":"");
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sb.append(prop.isUnseqToken()?"unseq, ":"");
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sb.append(prop.getMinorString()+ "(" + prop.getMinorStatus()+")");
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return sb.toString();
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}
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/**
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* Handshake (security context establishment process) between two Contexts
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* @param c the initiator
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* @param s the acceptor
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* @throws java.lang.Exception
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*/
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static public void handshake(final Context c, final Context s) throws Exception {
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byte[] t = new byte[0];
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while (!c.f || !s.f) {
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t = c.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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if (me.x.isEstablished()) {
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me.f = true;
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System.out.println(c.name + " side established");
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if (input != null) {
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throw new Exception("Context established but " +
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"still receive token at " + c.name);
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}
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return null;
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} else {
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System.out.println(c.name + " call initSecContext");
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return me.x.initSecContext(input, 0, input.length);
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}
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}
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}, t);
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t = s.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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if (me.x.isEstablished()) {
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me.f = true;
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System.out.println(s.name + " side established");
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if (input != null) {
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throw new Exception("Context established but " +
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"still receive token at " + s.name);
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}
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return null;
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} else {
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System.out.println(s.name + " called acceptSecContext");
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return me.x.acceptSecContext(input, 0, input.length);
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}
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}
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}, t);
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}
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}
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}
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