/*
* 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.security.Principal;
import java.io.File;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
import org.apache.catalina.LifecycleException;
import org.apache.catalina.util.StringManager;
import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;
import org.apache.tomcat.util.digester.Digester;
/**
* Simple implementation of <b>Realm</b> that reads an XML file to configure
* the valid users, passwords, and roles. The file format (and default file
* location) are identical to those currently supported by Tomcat 3.X.
* <p>
* <strong>IMPLEMENTATION NOTE</strong>: It is assumed that the in-memory
* collection representing our defined users (and their roles) is initialized
* at application startup and never modified again. Therefore, no thread
* synchronization is performed around accesses to the principals collection.
*
* @author Craig R. McClanahan
*
*/
public class MemoryRealm extends RealmBase {
private static Log log = LogFactory.getLog(MemoryRealm.class);
// ----------------------------------------------------- Instance Variables
/**
* The Digester we will use to process in-memory database files.
*/
private static Digester digester = null;
/**
* Descriptive information about this Realm implementation.
*/
protected final String info =
"org.apache.catalina.realm.MemoryRealm/1.0";
/**
* Descriptive information about this Realm implementation.
*/
protected static final String name = "MemoryRealm";
/**
* The pathname (absolute or relative to Catalina's current working
* directory) of the XML file containing our database information.
*/
private String pathname = "conf/tomcat-users.xml";
/**
* The set of valid Principals for this Realm, keyed by user name.
*/
private Map<String,GenericPrincipal> principals =
new HashMap<String,GenericPrincipal>();
/**
* The string manager for this package.
*/
private static StringManager sm =
StringManager.getManager(Constants.Package);
// ------------------------------------------------------------- Properties
/**
* Return descriptive information about this Realm implementation and
* the corresponding version number, in the format
* <code><description>/<version></code>.
*/
public String getInfo() {
return info;
}
/**
* Return the pathname of our XML file containing user definitions.
*/
public String getPathname() {
return pathname;
}
/**
* Set the pathname of our XML file containing user definitions. If a
* relative pathname is specified, it is resolved against "catalina.base".
*
* @param pathname The new pathname
*/
public void setPathname(String pathname) {
this.pathname = pathname;
}
// --------------------------------------------------------- Public Methods
/**
* Return the Principal associated with the specified username and
* credentials, if there is one; otherwise return <code>null</code>.
*
* @param username Username of the Principal to look up
* @param credentials Password or other credentials to use in
* authenticating this username
*/
@Override
public Principal authenticate(String username, String credentials) {
// No user or no credentials
// Can't possibly authenticate, don't bother the database then
if (username == null || credentials == null) {
return null;
}
GenericPrincipal principal = principals.get(username);
boolean validated = false;
String dbCredentials = null;
if (principal != null) {
dbCredentials = principal.getPassword();
}
if (hasMessageDigest()) {
// Hex hashes should be compared case-insensitive
validated = (digest(credentials).equalsIgnoreCase(dbCredentials));
} else {
validated = (digest(credentials).equals(dbCredentials));
}
if (validated) {
if (log.isDebugEnabled())
log.debug(sm.getString("memoryRealm.authenticateSuccess", username));
return (principal);
} else {
if (log.isDebugEnabled())
log.debug(sm.getString("memoryRealm.authenticateFailure", username));
return (null);
}
}
// -------------------------------------------------------- Package Methods
/**
* Add a new user to the in-memory database.
*
* @param username User's username
* @param password User's password (clear text)
* @param roles Comma-delimited set of roles associated with this user
*/
void addUser(String username, String password, String roles) {
// Accumulate the list of roles for this user
ArrayList<String> list = new ArrayList<String>();
roles += ",";
while (true) {
int comma = roles.indexOf(',');
if (comma < 0)
break;
String role = roles.substring(0, comma).trim();
list.add(role);
roles = roles.substring(comma + 1);
}
// Construct and cache the Principal for this user
GenericPrincipal principal =
new GenericPrincipal(this, username, password, list);
principals.put(username, principal);
}
// ------------------------------------------------------ Protected Methods
/**
* Return a configured <code>Digester</code> to use for processing
* the XML input file, creating a new one if necessary.
*/
protected synchronized Digester getDigester() {
if (digester == null) {
digester = new Digester();
digester.setValidating(false);
try {
digester.setFeature(
"http://apache.org/xml/features/allow-java-encodings",
true);
} catch (Exception e) {
log.warn(sm.getString("memoryRealm.xmlFeatureEncoding"), e);
}
digester.addRuleSet(new MemoryRuleSet());
}
return (digester);
}
/**
* Return a short name for this Realm implementation.
*/
protected String getName() {
return (name);
}
/**
* Return the password associated with the given principal's user name.
*/
protected String getPassword(String username) {
GenericPrincipal principal =
(GenericPrincipal) principals.get(username);
if (principal != null) {
return (principal.getPassword());
} else {
return (null);
}
}
/**
* Return the Principal associated with the given user name.
*/
protected Principal getPrincipal(String username) {
return (Principal) principals.get(username);
}
/**
* Returns the principals for this realm.
*
* @return The principals, keyed by user name (a String)
*/
protected Map getPrincipals() {
return principals;
}
// ------------------------------------------------------ Lifecycle Methods
/**
* Prepare for active use of the public methods of this Component.
*
* @exception LifecycleException if this component detects a fatal error
* that prevents it from being started
*/
public synchronized void start() throws LifecycleException {
// Perform normal superclass initialization
super.start();
// Validate the existence of our database file
File file = new File(pathname);
if (!file.isAbsolute())
file = new File(System.getProperty("catalina.base"), pathname);
if (!file.exists() || !file.canRead())
throw new LifecycleException
(sm.getString("memoryRealm.loadExist",
file.getAbsolutePath()));
// Load the contents of the database file
if (log.isDebugEnabled())
log.debug(sm.getString("memoryRealm.loadPath",
file.getAbsolutePath()));
Digester digester = getDigester();
try {
synchronized (digester) {
digester.push(this);
digester.parse(file);
}
} catch (Exception e) {
throw new LifecycleException
(sm.getString("memoryRealm.readXml"), e);
} finally {
digester.reset();
}
}
/**
* Gracefully shut down active use of the public methods of this Component.
*
* @exception LifecycleException if this component detects a fatal error
* that needs to be reported
*/
public synchronized void stop() throws LifecycleException {
// Perform normal superclass finalization
super.stop();
// No shutdown activities required
}
}