/*
* Copyright 1999,2004 The Apache Software Foundation.
*
* 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.apache.catalina.realm;
import java.security.Principal;
import java.sql.Connection;
import java.sql.Driver;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.Properties;
import org.apache.catalina.LifecycleException;
import org.apache.catalina.util.StringManager;
/**
*
* Implmentation of <b>Realm</b> that works with any JDBC supported database.
* See the JDBCRealm.howto for more details on how to set up the database and
* for configuration options.
*
* <p><strong>TODO</strong> - Support connection pooling (including message
* format objects) so that <code>authenticate()</code> does not have to be
* synchronized and would fix the ugly connection logic. </p>
*
* @author Craig R. McClanahan
* @author Carson McDonald
* @author Ignacio Ortega
* @version $Revision: 1.7 $ $Date: 2004/05/26 15:51:08 $
*/
public class JDBCRealm
extends RealmBase {
// ----------------------------------------------------- Instance Variables
/**
* The connection username to use when trying to connect to the database.
*/
protected String connectionName = null;
/**
* The connection URL to use when trying to connect to the database.
*/
protected String connectionPassword = null;
/**
* The connection URL to use when trying to connect to the database.
*/
protected String connectionURL = null;
/**
* The connection to the database.
*/
protected Connection dbConnection = null;
/**
* Instance of the JDBC Driver class we use as a connection factory.
*/
protected Driver driver = null;
/**
* The JDBC driver to use.
*/
protected String driverName = null;
/**
* Descriptive information about this Realm implementation.
*/
protected static final String info =
"org.apache.catalina.realm.JDBCRealm/1.0";
/**
* Descriptive information about this Realm implementation.
*/
protected static final String name = "JDBCRealm";
/**
* The PreparedStatement to use for authenticating users.
*/
protected PreparedStatement preparedCredentials = null;
/**
* The PreparedStatement to use for identifying the roles for
* a specified user.
*/
protected PreparedStatement preparedRoles = null;
/**
* The column in the user role table that names a role
*/
protected String roleNameCol = null;
/**
* The string manager for this package.
*/
protected static final StringManager sm =
StringManager.getManager(Constants.Package);
/**
* The column in the user table that holds the user's credintials
*/
protected String userCredCol = null;
/**
* The column in the user table that holds the user's name
*/
protected String userNameCol = null;
/**
* The table that holds the relation between user's and roles
*/
protected String userRoleTable = null;
/**
* The table that holds user data.
*/
protected String userTable = null;
// ------------------------------------------------------------- Properties
/**
* Return the username to use to connect to the database.
*
*/
public String getConnectionName() {
return connectionName;
}
/**
* Set the username to use to connect to the database.
*
* @param connectionName Username
*/
public void setConnectionName(String connectionName) {
this.connectionName = connectionName;
}
/**
* Return the password to use to connect to the database.
*
*/
public String getConnectionPassword() {
return connectionPassword;
}
/**
* Set the password to use to connect to the database.
*
* @param connectionPassword User password
*/
public void setConnectionPassword(String connectionPassword) {
this.connectionPassword = connectionPassword;
}
/**
* Return the URL to use to connect to the database.
*
*/
public String getConnectionURL() {
return connectionURL;
}
/**
* Set the URL to use to connect to the database.
*
* @param connectionURL The new connection URL
*/
public void setConnectionURL( String connectionURL ) {
this.connectionURL = connectionURL;
}
/**
* Return the JDBC driver that will be used.
*
*/
public String getDriverName() {
return driverName;
}
/**
* Set the JDBC driver that will be used.
*
* @param driverName The driver name
*/
public void setDriverName( String driverName ) {
this.driverName = driverName;
}
/**
* Return the column in the user role table that names a role.
*
*/
public String getRoleNameCol() {
return roleNameCol;
}
/**
* Set the column in the user role table that names a role.
*
* @param roleNameCol The column name
*/
public void setRoleNameCol( String roleNameCol ) {
this.roleNameCol = roleNameCol;
}
/**
* Return the column in the user table that holds the user's credentials.
*
*/
public String getUserCredCol() {
return userCredCol;
}
/**
* Set the column in the user table that holds the user's credentials.
*
* @param userCredCol The column name
*/
public void setUserCredCol( String userCredCol ) {
this.userCredCol = userCredCol;
}
/**
* Return the column in the user table that holds the user's name.
*
*/
public String getUserNameCol() {
return userNameCol;
}
/**
* Set the column in the user table that holds the user's name.
*
* @param userNameCol The column name
*/
public void setUserNameCol( String userNameCol ) {
this.userNameCol = userNameCol;
}
/**
* Return the table that holds the relation between user's and roles.
*
*/
public String getUserRoleTable() {
return userRoleTable;
}
/**
* Set the table that holds the relation between user's and roles.
*
* @param userRoleTable The table name
*/
public void setUserRoleTable( String userRoleTable ) {
this.userRoleTable = userRoleTable;
}
/**
* Return the table that holds user data..
*
*/
public String getUserTable() {
return userTable;
}
/**
* Set the table that holds user data.
*
* @param userTable The table name
*/
public void setUserTable( String userTable ) {
this.userTable = userTable;
}
// --------------------------------------------------------- Public Methods
/**
* Return the Principal associated with the specified username and
* credentials, if there is one; otherwise return <code>null</code>.
*
* If there are any errors with the JDBC connection, executing
* the query or anything we return null (don't authenticate). This
* event is also logged, and the connection will be closed so that
* a subsequent request will automatically re-open it.
*
*
* @param username Username of the Principal to look up
* @param credentials Password or other credentials to use in
* authenticating this username
*/
public synchronized Principal authenticate(String username, String credentials) {
// Number of tries is the numebr of attempts to connect to the database
// during this login attempt (if we need to open the database)
// This needs rewritten wuth better pooling support, the existing code
// needs signature changes since the Prepared statements needs cached
// with the connections.
// The code below will try twice if there is a SQLException so the
// connection may try to be opened again. On normal conditions (including
// invalid login - the above is only used once.
int numberOfTries = 2;
while (numberOfTries>0) {
try {
// Ensure that we have an open database connection
open();
// Acquire a Principal object for this user
Principal principal = authenticate(dbConnection,
username, credentials);
// Return the Principal (if any)
return (principal);
} catch (SQLException e) {
// Log the problem for posterity
log(sm.getString("jdbcRealm.exception"), e);
// Close the connection so that it gets reopened next time
if (dbConnection != null)
close(dbConnection);
}
numberOfTries--;
}
// Worst case scenario
return null;
}
// -------------------------------------------------------- Package Methods
// ------------------------------------------------------ Protected Methods
/**
* Return the Principal associated with the specified username and
* credentials, if there is one; otherwise return <code>null</code>.
*
* @param dbConnection The database connection to be used
* @param username Username of the Principal to look up
* @param credentials Password or other credentials to use in
* authenticating this username
*
* @exception SQLException if a database error occurs
*/
public synchronized Principal authenticate(Connection dbConnection,
String username,
String credentials)
throws SQLException {
// Look up the user's credentials
String dbCredentials = null;
PreparedStatement stmt = null;
ResultSet rs = null;
try {
stmt = credentials(dbConnection, username);
rs = stmt.executeQuery();
if (rs.next()) {
dbCredentials = rs.getString(1);
}
rs.close();
rs = null;
if (dbCredentials == null) {
return (null);
}
dbCredentials = dbCredentials.trim();
// Validate the user's credentials
boolean validated = false;
if (hasMessageDigest()) {
// Hex hashes should be compared case-insensitive
validated = (digest(credentials).equalsIgnoreCase(dbCredentials));
} else {
validated = (digest(credentials).equals(dbCredentials));
}
if (validated) {
if (debug >= 2)
log(sm.getString("jdbcRealm.authenticateSuccess",
username));
} else {
if (debug >= 2)
log(sm.getString("jdbcRealm.authenticateFailure",
username));
return (null);
}
// Accumulate the user's roles
ArrayList roleList = new ArrayList();
stmt = roles(dbConnection, username);
rs = stmt.executeQuery();
while (rs.next()) {
String role = rs.getString(1);
if (null!=role) {
roleList.add(role.trim());
}
}
rs.close();
rs = null;
// Create and return a suitable Principal for this user
return (new GenericPrincipal(this, username, credentials, roleList));
} finally {
if (rs!=null) {
try {
rs.close();
} catch(SQLException e) {
log(sm.getString("jdbcRealm.abnormalCloseResultSet"));
}
}
dbConnection.commit();
}
}
/**
* Close the specified database connection.
*
* @param dbConnection The connection to be closed
*/
protected void close(Connection dbConnection) {
// Do nothing if the database connection is already closed
if (dbConnection == null)
return;
// Close our prepared statements (if any)
try {
preparedCredentials.close();
} catch (Throwable f) {
;
}
this.preparedCredentials = null;
try {
preparedRoles.close();
} catch (Throwable f) {
;
}
this.preparedRoles = null;
// Close this database connection, and log any errors
try {
dbConnection.close();
} catch (SQLException e) {
log(sm.getString("jdbcRealm.close"), e); // Just log it here
} finally {
this.dbConnection = null;
}
}
/**
* Return a PreparedStatement configured to perform the SELECT required
* to retrieve user credentials for the specified username.
*
* @param dbConnection The database connection to be used
* @param username Username for which credentials should be retrieved
*
* @exception SQLException if a database error occurs
*/
protected PreparedStatement credentials(Connection dbConnection,
String username)
throws SQLException {
if (preparedCredentials == null) {
StringBuffer sb = new StringBuffer("SELECT ");
sb.append(userCredCol);
sb.append(" FROM ");
sb.append(userTable);
sb.append(" WHERE ");
sb.append(userNameCol);
sb.append(" = ?");
preparedCredentials =
dbConnection.prepareStatement(sb.toString());
}
if (username == null) {
preparedCredentials.setNull(1,java.sql.Types.VARCHAR);
} else {
preparedCredentials.setString(1, username);
}
return (preparedCredentials);
}
/**
* 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) {
return (null);
}
/**
* Return the Principal associated with the given user name.
*/
protected Principal getPrincipal(String username) {
return (null);
}
/**
* Open (if necessary) and return a database connection for use by
* this Realm.
*
* @exception SQLException if a database error occurs
*/
protected Connection open() throws SQLException {
// Do nothing if there is a database connection already open
if (dbConnection != null)
return (dbConnection);
// Instantiate our database driver if necessary
if (driver == null) {
try {
Class clazz = Class.forName(driverName);
driver = (Driver) clazz.newInstance();
} catch (Throwable e) {
throw new SQLException(e.getMessage());
}
}
// Open a new connection
Properties props = new Properties();
if (connectionName != null)
props.put("user", connectionName);
if (connectionPassword != null)
props.put("password", connectionPassword);
dbConnection = driver.connect(connectionURL, props);
dbConnection.setAutoCommit(false);
return (dbConnection);
}
/**
* Release our use of this connection so that it can be recycled.
*
* @param dbConnection The connection to be released
*/
protected void release(Connection dbConnection) {
; // NO-OP since we are not pooling anything
}
/**
* Return a PreparedStatement configured to perform the SELECT required
* to retrieve user roles for the specified username.
*
* @param dbConnection The database connection to be used
* @param username Username for which roles should be retrieved
*
* @exception SQLException if a database error occurs
*/
protected PreparedStatement roles(Connection dbConnection, String username)
throws SQLException {
if (preparedRoles == null) {
StringBuffer sb = new StringBuffer("SELECT ");
sb.append(roleNameCol);
sb.append(" FROM ");
sb.append(userRoleTable);
sb.append(" WHERE ");
sb.append(userNameCol);
sb.append(" = ?");
preparedRoles =
dbConnection.prepareStatement(sb.toString());
}
preparedRoles.setString(1, username);
return (preparedRoles);
}
// ------------------------------------------------------ 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 void start() throws LifecycleException {
// Validate that we can open our connection - but let tomcat
// startup in case the database is temporarily unavailable
try {
open();
} catch (SQLException e) {
log(sm.getString("jdbcRealm.open"), 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 void stop() throws LifecycleException {
// Perform normal superclass finalization
super.stop();
// Close any open DB connection
close(this.dbConnection);
}
}
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