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package org.apache.catalina.realm;
import java.security.Principal;
import java.io.File;
import java.util.ArrayList;
import java.util.HashMap;
import org.apache.catalina.LifecycleException;
import org.apache.catalina.util.StringManager;
import com.sun.org.apache.commons.digester.Digester;
import com.sun.org.apache.commons.logging.Log;
import com.sun.org.apache.commons.logging.LogFactory;
/**
* 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
* @version $Revision: 1.5 $ $Date: 2007/05/05 05:32:17 $
*/
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 HashMap principals = new HashMap();
/**
* The string manager for this package.
*/
private static StringManager sm =
StringManager.getManager(Constants.Package);
/**
* Has this component been started?
*/
private boolean started = false;
// ------------------------------------------------------------- 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
*/
public Principal authenticate(String username, String credentials) {
GenericPrincipal principal =
(GenericPrincipal) principals.get(username);
boolean validated = false;
if (principal != null) {
if (hasMessageDigest()) {
// Hex hashes should be compared case-insensitive
validated = (digest(credentials)
.equalsIgnoreCase(principal.getPassword()));
} else {
validated =
(digest(credentials).equals(principal.getPassword()));
}
}
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 list = new ArrayList();
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.setDebug(this.debug);
digester.setValidating(false);
digester.addRuleSet(new MemoryRuleSet());
}
return (digester);
}
/**
* Return a short name for this Realm implementation.
*/
protected String getName() {
return (this.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);
}
// ------------------------------------------------------ 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 {
// 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("memoryRealm.readXml", e);
}
// Perform normal superclass initialization
super.start();
}
/**
* 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
}
}
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