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/*
* JBoss, Home of Professional Open Source.
* Copyright 2014 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* Licensed 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 org.wildfly.security.sasl.util;
import static org.wildfly.security.provider.util.ProviderUtil.INSTALLED_PROVIDERS;
import java.security.InvalidParameterException;
import java.security.NoSuchAlgorithmException;
import java.security.Provider;
import java.security.Provider.Service;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.Map;
import java.util.Set;
import java.util.function.BiPredicate;
import java.util.function.Supplier;
import javax.security.auth.callback.CallbackHandler;
import javax.security.sasl.SaslClient;
import javax.security.sasl.SaslClientFactory;
import javax.security.sasl.SaslException;
import static org.wildfly.security.sasl._private.ElytronMessages.log;
/**
* A {@link SaslClientFactory} which uses the currently installed security providers to acquire a delegate
* {@code SaslClientFactory}. The provider service instances may or may not be cached.
*
* @author David M. Lloyd
*/
public final class SecurityProviderSaslClientFactory implements SaslClientFactory {
private static final String SERVICE_TYPE = SaslClientFactory.class.getSimpleName();
private final Supplier providerSupplier;
/**
* Construct a new instance.
*
* @param providerSupplier the provider supplier
*/
public SecurityProviderSaslClientFactory(final Supplier providerSupplier) {
this.providerSupplier = providerSupplier;
}
/**
* Construct a new instance. The currently installed system providers are used.
*/
public SecurityProviderSaslClientFactory() {
this(INSTALLED_PROVIDERS);
}
@Override
public SaslClient createSaslClient(final String[] mechanisms, final String authorizationId, final String protocol, final String serverName, final Map props, final CallbackHandler cbh) throws SaslException {
class Pair {
final Provider provider;
final SaslClientFactory saslClientFactory;
Pair(Provider provider, SaslClientFactory saslClientFactory) {
this.provider = provider;
this.saslClientFactory = saslClientFactory;
}
}
final BiPredicate mechFilter = SaslFactories.getProviderFilterPredicate(props);
final ArrayList clientFactoryList = new ArrayList<>();
for (Provider currentProvider : providerSupplier.get()) {
if (currentProvider == null) {
continue;
}
Set services = currentProvider.getServices();
if (services != null) {
for (Service service : currentProvider.getServices()) {
if (SERVICE_TYPE.equals(service.getType())) {
try {
clientFactoryList.add(new Pair(currentProvider, (SaslClientFactory) service.newInstance(null)));
} catch (NoSuchAlgorithmException | ClassCastException | InvalidParameterException e) {
log.debug("Unable to create instance", e);
}
}
}
}
}
SaslClient saslClient;
final String[] mechArray = new String[1];
for (String mechanism : mechanisms) {
mechArray[0] = mechanism;
for (Pair pair : clientFactoryList) {
// this is more efficient than it looks: the only possible returns are mechArray or a constant empty array
String[] filtered = SaslFactories.filterMechanismsByProvider(mechArray, 0, 0, pair.provider, mechFilter);
if (filtered.length > 0) {
saslClient = pair.saslClientFactory.createSaslClient(mechArray, authorizationId, protocol, serverName, props, cbh);
if (saslClient != null) {
if (log.isTraceEnabled()) {
log.tracef("Created SaslClient for mechanism %s, using Provider %s and protocol %s", saslClient.getMechanismName(), pair.provider.getName(), protocol);
}
return saslClient;
}
}
}
}
if (log.isTraceEnabled()) {
log.tracef("No %s provided by providers in %s: %s", SERVICE_TYPE, getClass().getSimpleName(), Arrays.toString(providerSupplier.get()));
}
return null;
}
@Override
public String[] getMechanismNames(final Map props) {
final BiPredicate mechFilter = SaslFactories.getProviderFilterPredicate(props);
final Set names = new LinkedHashSet<>();
for (Provider currentProvider : providerSupplier.get()) {
Set services = currentProvider.getServices();
if (services != null) {
for (Service service : services) {
if (SERVICE_TYPE.equals(service.getType())) {
try {
final String[] mechanismNames = ((SaslClientFactory) service.newInstance(null)).getMechanismNames(props);
Collections.addAll(names, SaslFactories.filterMechanismsByProvider(mechanismNames, 0, 0, currentProvider, mechFilter));
} catch (NoSuchAlgorithmException | ClassCastException | InvalidParameterException e) {
log.debug("Unable to create instance", e);
}
}
}
}
}
if (names.size() == 0 && log.isTraceEnabled()) {
log.tracef("No %s provided by providers in %s: %s", SERVICE_TYPE, getClass().getSimpleName(), Arrays.toString(providerSupplier.get()));
}
return names.toArray(new String[names.size()]);
}
}
