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Exerimental Minimal Tomcat for Programmatic Use
/*
* 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 org.apache.catalina.realm;
import java.io.ObjectStreamException;
import java.security.Principal;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;
import javax.naming.Context;
import org.apache.catalina.Group;
import org.apache.catalina.LifecycleException;
import org.apache.catalina.Role;
import org.apache.catalina.Server;
import org.apache.catalina.User;
import org.apache.catalina.UserDatabase;
import org.apache.naming.ContextBindings;
import org.apache.tomcat.util.ExceptionUtils;
/**
* Implementation of {@link org.apache.catalina.Realm} that is based on an implementation of {@link UserDatabase} made
* available through the JNDI resources configured for this instance of Catalina. Set the resourceName
* parameter to the JNDI resources name for the configured instance of UserDatabase that we should consult.
*
* @author Craig R. McClanahan
*
* @since 4.1
*/
public class UserDatabaseRealm extends RealmBase {
// ----------------------------------------------------- Instance Variables
/**
* The UserDatabase we will use to authenticate users and identify associated roles.
*/
protected volatile UserDatabase database = null;
private final Object databaseLock = new Object();
/**
* The global JNDI name of the UserDatabase resource we will be utilizing.
*/
protected String resourceName = "UserDatabase";
/**
* Obtain the UserDatabase from the context (rather than global) JNDI.
*/
private boolean localJndiResource = false;
/**
* Use a static principal disconnected from the database. This prevents live updates to users and roles having an
* effect on authenticated principals, but reduces use of the database.
*/
private boolean useStaticPrincipal = false;
// ------------------------------------------------------------- Properties
/**
* @return the global JNDI name of the UserDatabase resource we will be using.
*/
public String getResourceName() {
return resourceName;
}
/**
* Set the global JNDI name of the UserDatabase resource we will be using.
*
* @param resourceName The new global JNDI name
*/
public void setResourceName(String resourceName) {
this.resourceName = resourceName;
}
/**
* @return the useStaticPrincipal flag
*/
public boolean getUseStaticPrincipal() {
return this.useStaticPrincipal;
}
/**
* Allows using a static principal disconnected from the user database.
*
* @param useStaticPrincipal the new value
*/
public void setUseStaticPrincipal(boolean useStaticPrincipal) {
this.useStaticPrincipal = useStaticPrincipal;
}
/**
* Determines whether this Realm is configured to obtain the associated {@link UserDatabase} from the global JNDI
* context or a local (web application) JNDI context.
*
* @return {@code true} if a local JNDI context will be used, {@code false} if the the global JNDI context will be
* used
*/
public boolean getLocalJndiResource() {
return localJndiResource;
}
/**
* Configure whether this Realm obtains the associated {@link UserDatabase} from the global JNDI context or a local
* (web application) JNDI context.
*
* @param localJndiResource {@code true} to use a local JNDI context, {@code false} to use the global JNDI context
*/
public void setLocalJndiResource(boolean localJndiResource) {
this.localJndiResource = localJndiResource;
}
// ------------------------------------------------------ Protected Methods
/**
* Calls {@link UserDatabase#backgroundProcess()}.
*/
@Override
public void backgroundProcess() {
UserDatabase database = getUserDatabase();
if (database != null) {
database.backgroundProcess();
}
}
@Override
protected String getPassword(String username) {
UserDatabase database = getUserDatabase();
if (database == null) {
return null;
}
User user = database.findUser(username);
if (user == null) {
return null;
}
return user.getPassword();
}
public static String[] getRoles(User user) {
Set roles = new HashSet<>();
Iterator uroles = user.getRoles();
while (uroles.hasNext()) {
Role role = uroles.next();
roles.add(role.getName());
}
Iterator groups = user.getGroups();
while (groups.hasNext()) {
Group group = groups.next();
uroles = group.getRoles();
while (uroles.hasNext()) {
Role role = uroles.next();
roles.add(role.getName());
}
}
return roles.toArray(new String[0]);
}
@Override
protected Principal getPrincipal(String username) {
UserDatabase database = getUserDatabase();
if (database == null) {
return null;
}
User user = database.findUser(username);
if (user == null) {
return null;
} else {
if (useStaticPrincipal) {
return new GenericPrincipal(username, Arrays.asList(getRoles(user)));
} else {
return new UserDatabasePrincipal(user, database);
}
}
}
/*
* Can't do this in startInternal() with local JNDI as the local JNDI context won't be initialised at this point.
*/
private UserDatabase getUserDatabase() {
// DCL so database MUST be volatile
if (database == null) {
synchronized (databaseLock) {
if (database == null) {
try {
Context context = null;
if (localJndiResource) {
context = ContextBindings.getClassLoader();
context = (Context) context.lookup("comp/env");
} else {
Server server = getServer();
if (server == null) {
containerLog.error(sm.getString("userDatabaseRealm.noNamingContext"));
return null;
}
context = getServer().getGlobalNamingContext();
}
database = (UserDatabase) context.lookup(resourceName);
} catch (Throwable e) {
ExceptionUtils.handleThrowable(e);
if (containerLog != null) {
containerLog.error(sm.getString("userDatabaseRealm.lookup", resourceName), e);
}
database = null;
}
}
}
}
return database;
}
// ------------------------------------------------------ Lifecycle Methods
@Override
protected void startInternal() throws LifecycleException {
// If the JNDI resource is global, check it here and fail the context
// start if it is not valid. Local JNDI resources can't be validated
// this way because the JNDI context isn't available at Realm start.
if (!localJndiResource) {
UserDatabase database = getUserDatabase();
if (database == null) {
throw new LifecycleException(sm.getString("userDatabaseRealm.noDatabase", resourceName));
}
}
super.startInternal();
}
@Override
protected void stopInternal() throws LifecycleException {
// Perform normal superclass finalization
super.stopInternal();
// Release reference to our user database
database = null;
}
@Override
public boolean isAvailable() {
return (database == null) ? false : database.isAvailable();
}
public static final class UserDatabasePrincipal extends GenericPrincipal {
private static final long serialVersionUID = 1L;
private final transient UserDatabase database;
public UserDatabasePrincipal(User user, UserDatabase database) {
super(user.getName());
this.database = database;
}
@Override
public String[] getRoles() {
if (database == null) {
return new String[0];
}
User user = database.findUser(name);
if (user == null) {
return new String[0];
}
Set roles = new HashSet<>();
Iterator uroles = user.getRoles();
while (uroles.hasNext()) {
Role role = uroles.next();
roles.add(role.getName());
}
Iterator groups = user.getGroups();
while (groups.hasNext()) {
Group group = groups.next();
uroles = group.getRoles();
while (uroles.hasNext()) {
Role role = uroles.next();
roles.add(role.getName());
}
}
return roles.toArray(new String[0]);
}
@Override
public boolean hasRole(String role) {
if ("*".equals(role)) {
return true;
} else if (role == null) {
return false;
}
if (database == null) {
return super.hasRole(role);
}
Role dbrole = database.findRole(role);
if (dbrole == null) {
return false;
}
User user = database.findUser(name);
if (user == null) {
return false;
}
if (user.isInRole(dbrole)) {
return true;
}
Iterator groups = user.getGroups();
while (groups.hasNext()) {
Group group = groups.next();
if (group.isInRole(dbrole)) {
return true;
}
}
return false;
}
/**
* Magic method from {@link java.io.Serializable}.
*
* @return The object to serialize instead of this object
*
* @throws ObjectStreamException Not thrown by this implementation
*/
private Object writeReplace() throws ObjectStreamException {
// Replace with a static principal disconnected from the database
return new GenericPrincipal(getName(), Arrays.asList(getRoles()));
}
}
}