/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.sun.jini.discovery.kerberos;
import com.sun.jini.discovery.UnicastDiscoveryClient;
import com.sun.jini.discovery.UnicastResponse;
import com.sun.jini.discovery.internal.EndpointBasedClient;
import com.sun.jini.discovery.internal.EndpointInternals;
import com.sun.jini.discovery.internal.KerberosEndpointInternalsAccess;
import java.io.IOException;
import java.net.Socket;
import java.nio.ByteBuffer;
import java.security.AccessController;
import java.security.Principal;
import java.security.PrivilegedAction;
import java.util.Collection;
import java.util.Iterator;
import java.util.Set;
import javax.net.SocketFactory;
import javax.security.auth.kerberos.KerberosPrincipal;
import net.jini.core.constraint.InvocationConstraint;
import net.jini.core.constraint.InvocationConstraints;
import net.jini.core.constraint.ServerMinPrincipal;
import net.jini.io.UnsupportedConstraintException;
import net.jini.jeri.Endpoint;
import net.jini.jeri.kerberos.KerberosEndpoint;
/**
* Implements the client side of the <code>net.jini.discovery.kerberos</code>
* unicast discovery format.
*
* @author Sun Microsystems, Inc.
* @since 2.0
*/
public class Client implements UnicastDiscoveryClient {
// Internal implementation. We dont want to expose the internal base
// classes to the outside.
private final ClientImpl impl;
/**
* Creates a new instance.
*/
public Client() {
impl = new ClientImpl();
}
// javadoc inherited from DiscoveryFormatProvider
public String getFormatName() {
return impl.getFormatName();
}
// javadoc inherited from UnicastDiscoveryClient
public void checkUnicastDiscoveryConstraints(
InvocationConstraints constraints)
throws UnsupportedConstraintException
{
impl.checkUnicastDiscoveryConstraints(constraints);
}
// javadoc inherited from UnicastDiscoveryClient
public UnicastResponse doUnicastDiscovery(Socket socket,
InvocationConstraints constraints,
ClassLoader defaultLoader,
ClassLoader verifierLoader,
Collection context,
ByteBuffer sent,
ByteBuffer received)
throws IOException, ClassNotFoundException
{
return impl.doUnicastDiscovery(socket, constraints, defaultLoader,
verifierLoader, context, sent, received);
}
private static final class ClientImpl extends EndpointBasedClient {
private static EndpointInternals epi = (EndpointInternals)
AccessController.doPrivileged(new PrivilegedAction() {
public Object run() {
return KerberosEndpointInternalsAccess.get();
}
});
ClientImpl() {
super("net.jini.discovery.kerberos", epi);
}
// documentation inherited from EndpointBasedClient
protected Endpoint getEndpoint(SocketFactory factory,
InvocationConstraints constraints)
throws UnsupportedConstraintException
{
return KerberosEndpoint.getInstance(
"ignored", 1, getKerberosPrincipal(constraints), factory);
}
/**
* Returns the kerberos principal specified in the ServerMinPrincipal
* requirements or preferences of the given constraints. Throws
* UnsupportedConstraintException if no kerberos principal is specified, a
* non-kerberos server principal is required, or multiple server principals
* are required.
*/
private static KerberosPrincipal getKerberosPrincipal(
InvocationConstraints constraints)
throws UnsupportedConstraintException
{
KerberosPrincipal principal = null;
for (Iterator i = constraints.requirements().iterator(); i.hasNext(); )
{
InvocationConstraint c = (InvocationConstraint) i.next();
if (c instanceof ServerMinPrincipal) {
Set s = ((ServerMinPrincipal) c).elements();
if (s.size() > 1) {
throw new UnsupportedConstraintException(
"multiple server principals");
}
Principal p = (Principal) s.iterator().next();
if (!(p instanceof KerberosPrincipal)) {
throw new UnsupportedConstraintException(
"non-kerberos server principal");
}
if (principal == null) {
principal = (KerberosPrincipal) p;
} else if (!principal.equals(p)) {
throw new UnsupportedConstraintException(
"multiple server principals");
}
}
// NYI: support ConstraintAlternatives with ServerMinPrincipals
}
if (principal != null) {
return principal;
}
for (Iterator i = constraints.preferences().iterator(); i.hasNext(); )
{
InvocationConstraint c = (InvocationConstraint) i.next();
if (c instanceof ServerMinPrincipal) {
Set s = ((ServerMinPrincipal) c).elements();
for (Iterator j = s.iterator(); j.hasNext(); ) {
Principal p = (Principal) j.next();
if (p instanceof KerberosPrincipal) {
return (KerberosPrincipal) p;
}
}
}
// NYI: support ConstraintAlternatives with ServerMinPrincipals
}
throw new UnsupportedConstraintException("no kerberos principal");
}
}
}