/*
* 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.File;
import java.io.IOException;
import java.security.Principal;
import java.util.Map;
import java.util.Map.Entry;
import javax.security.auth.Subject;
import javax.security.auth.callback.Callback;
import javax.security.auth.callback.CallbackHandler;
import javax.security.auth.callback.NameCallback;
import javax.security.auth.callback.PasswordCallback;
import javax.security.auth.callback.TextInputCallback;
import javax.security.auth.callback.UnsupportedCallbackException;
import javax.security.auth.login.FailedLoginException;
import javax.security.auth.login.LoginException;
import javax.security.auth.spi.LoginModule;
import javax.servlet.http.HttpServletRequest;
import org.apache.catalina.CredentialHandler;
import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;
import org.apache.tomcat.util.IntrospectionUtils;
import org.apache.tomcat.util.digester.Digester;
/**
* <p>Implementation of the JAAS <strong>LoginModule</strong> interface,
* primarily for use in testing <code>JAASRealm</code>. It utilizes an
* XML-format data file of username/password/role information identical to
* that supported by <code>org.apache.catalina.realm.MemoryRealm</code>.</p>
*
* <p>This class recognizes the following string-valued options, which are
* specified in the configuration file and passed to {@link
* #initialize(Subject, CallbackHandler, Map, Map)} in the <code>options</code>
* argument:</p>
* <ul>
* <li><strong>pathname</strong> - Relative (to the pathname specified by the
* "catalina.base" system property) or absolute pathname to the
* XML file containing our user information, in the format supported by
* {@link MemoryRealm}. The default value matches the MemoryRealm
* default.</li>
* <li><strong>credentialHandlerClassName</strong> - The fully qualified class
* name of the CredentialHandler to use. If not specified, {@link
* MessageDigestCredentialHandler} will be used.</li>
* <li>Any additional options will be used to identify and call setters on the
* {@link CredentialHandler}. For example, <code>algorithm=SHA256</code>
* would result in a call to {@link
* MessageDigestCredentialHandler#setAlgorithm(String)} with a parameter of
* <code>"SHA256"</code></li>
* </ul>
*
* <p><strong>IMPLEMENTATION NOTE</strong> - This class implements
* <code>Realm</code> only to satisfy the calling requirements of the
* <code>GenericPrincipal</code> constructor. It does not actually perform
* the functionality required of a <code>Realm</code> implementation.</p>
*
* @author Craig R. McClanahan
*/
public class JAASMemoryLoginModule extends MemoryRealm implements LoginModule {
// We need to extend MemoryRealm to avoid class cast
private static final Log log = LogFactory.getLog(JAASMemoryLoginModule.class);
// ----------------------------------------------------- Instance Variables
/**
* The callback handler responsible for answering our requests.
*/
protected CallbackHandler callbackHandler = null;
/**
* Has our own <code>commit()</code> returned successfully?
*/
protected boolean committed = false;
/**
* The configuration information for this <code>LoginModule</code>.
*/
protected Map<String,?> options = null;
/**
* The absolute or relative pathname to the XML configuration file.
*/
protected String pathname = "conf/tomcat-users.xml";
/**
* The <code>Principal</code> identified by our validation, or
* <code>null</code> if validation failed.
*/
protected Principal principal = null;
/**
* The state information that is shared with other configured
* <code>LoginModule</code> instances.
*/
protected Map<String,?> sharedState = null;
/**
* The subject for which we are performing authentication.
*/
protected Subject subject = null;
// --------------------------------------------------------- Public Methods
public JAASMemoryLoginModule() {
if (log.isDebugEnabled()) {
log.debug("MEMORY LOGIN MODULE");
}
}
/**
* Phase 2 of authenticating a <code>Subject</code> when Phase 1
* fails. This method is called if the <code>LoginContext</code>
* failed somewhere in the overall authentication chain.
*
* @return <code>true</code> if this method succeeded, or
* <code>false</code> if this <code>LoginModule</code> should be
* ignored
*
* @exception LoginException if the abort fails
*/
@Override
public boolean abort() throws LoginException {
// If our authentication was not successful, just return false
if (principal == null) {
return false;
}
// Clean up if overall authentication failed
if (committed) {
logout();
} else {
committed = false;
principal = null;
}
if (log.isDebugEnabled()) {
log.debug("Abort");
}
return true;
}
/**
* Phase 2 of authenticating a <code>Subject</code> when Phase 1
* was successful. This method is called if the <code>LoginContext</code>
* succeeded in the overall authentication chain.
*
* @return <code>true</code> if the authentication succeeded, or
* <code>false</code> if this <code>LoginModule</code> should be
* ignored
*
* @exception LoginException if the commit fails
*/
@Override
public boolean commit() throws LoginException {
if (log.isDebugEnabled()) {
log.debug("commit " + principal);
}
// If authentication was not successful, just return false
if (principal == null) {
return false;
}
// Add our Principal to the Subject if needed
if (!subject.getPrincipals().contains(principal)) {
subject.getPrincipals().add(principal);
// Add the roles as additional subjects as per the contract with the
// JAASRealm
if (principal instanceof GenericPrincipal) {
String roles[] = ((GenericPrincipal) principal).getRoles();
for (int i = 0; i < roles.length; i++) {
subject.getPrincipals().add(new GenericPrincipal(roles[i], null, null));
}
}
}
committed = true;
return true;
}
/**
* Initialize this <code>LoginModule</code> with the specified
* configuration information.
*
* @param subject The <code>Subject</code> to be authenticated
* @param callbackHandler A <code>CallbackHandler</code> for communicating
* with the end user as necessary
* @param sharedState State information shared with other
* <code>LoginModule</code> instances
* @param options Configuration information for this specific
* <code>LoginModule</code> instance
*/
@Override
public void initialize(Subject subject, CallbackHandler callbackHandler,
Map<String,?> sharedState, Map<String,?> options) {
if (log.isDebugEnabled()) {
log.debug("Init");
}
// Save configuration values
this.subject = subject;
this.callbackHandler = callbackHandler;
this.sharedState = sharedState;
this.options = options;
// Perform instance-specific initialization
Object option = options.get("pathname");
if (option instanceof String) {
this.pathname = (String) option;
}
CredentialHandler credentialHandler = null;
option = options.get("credentialHandlerClassName");
if (option instanceof String) {
try {
Class<?> clazz = Class.forName((String) option);
credentialHandler = (CredentialHandler) clazz.newInstance();
} catch (InstantiationException | IllegalAccessException | ClassNotFoundException e) {
throw new IllegalArgumentException(e);
}
}
if (credentialHandler == null) {
credentialHandler = new MessageDigestCredentialHandler();
}
for (Entry<String,?> entry : options.entrySet()) {
if ("pathname".equals(entry.getKey())) {
continue;
}
if ("credentialHandlerClassName".equals(entry.getKey())) {
continue;
}
// Skip any non-String values since any value we are interested in
// will be a String.
if (entry.getValue() instanceof String) {
IntrospectionUtils.setProperty(credentialHandler, entry.getKey(),
(String) entry.getValue());
}
}
setCredentialHandler(credentialHandler);
// Load our defined Principals
load();
}
/**
* Phase 1 of authenticating a <code>Subject</code>.
*
* @return <code>true</code> if the authentication succeeded, or
* <code>false</code> if this <code>LoginModule</code> should be
* ignored
*
* @exception LoginException if the authentication fails
*/
@Override
public boolean login() throws LoginException {
// Set up our CallbackHandler requests
if (callbackHandler == null)
throw new LoginException("No CallbackHandler specified");
Callback callbacks[] = new Callback[9];
callbacks[0] = new NameCallback("Username: ");
callbacks[1] = new PasswordCallback("Password: ", false);
callbacks[2] = new TextInputCallback("nonce");
callbacks[3] = new TextInputCallback("nc");
callbacks[4] = new TextInputCallback("cnonce");
callbacks[5] = new TextInputCallback("qop");
callbacks[6] = new TextInputCallback("realmName");
callbacks[7] = new TextInputCallback("md5a2");
callbacks[8] = new TextInputCallback("authMethod");
// Interact with the user to retrieve the username and password
String username = null;
String password = null;
String nonce = null;
String nc = null;
String cnonce = null;
String qop = null;
String realmName = null;
String md5a2 = null;
String authMethod = null;
try {
callbackHandler.handle(callbacks);
username = ((NameCallback) callbacks[0]).getName();
password =
new String(((PasswordCallback) callbacks[1]).getPassword());
nonce = ((TextInputCallback) callbacks[2]).getText();
nc = ((TextInputCallback) callbacks[3]).getText();
cnonce = ((TextInputCallback) callbacks[4]).getText();
qop = ((TextInputCallback) callbacks[5]).getText();
realmName = ((TextInputCallback) callbacks[6]).getText();
md5a2 = ((TextInputCallback) callbacks[7]).getText();
authMethod = ((TextInputCallback) callbacks[8]).getText();
} catch (IOException | UnsupportedCallbackException e) {
throw new LoginException(e.toString());
}
// Validate the username and password we have received
if (authMethod == null) {
// BASIC or FORM
principal = super.authenticate(username, password);
} else if (authMethod.equals(HttpServletRequest.DIGEST_AUTH)) {
principal = super.authenticate(username, password, nonce, nc,
cnonce, qop, realmName, md5a2);
} else if (authMethod.equals(HttpServletRequest.CLIENT_CERT_AUTH)) {
principal = super.getPrincipal(username);
} else {
throw new LoginException("Unknown authentication method");
}
if (log.isDebugEnabled()) {
log.debug("login " + username + " " + principal);
}
// Report results based on success or failure
if (principal != null) {
return true;
} else {
throw new FailedLoginException("Username or password is incorrect");
}
}
/**
* Log out this user.
*
* @return <code>true</code> in all cases because the
* <code>LoginModule</code> should not be ignored
*
* @exception LoginException if logging out failed
*/
@Override
public boolean logout() throws LoginException {
subject.getPrincipals().remove(principal);
committed = false;
principal = null;
return true;
}
// ---------------------------------------------------------- Realm Methods
// ------------------------------------------------------ Protected Methods
/**
* Load the contents of our configuration file.
*/
protected void load() {
// Validate the existence of our configuration file
File file = new File(pathname);
if (!file.isAbsolute()) {
String catalinaBase = getCatalinaBase();
if (catalinaBase == null) {
log.warn("Unable to determine Catalina base to load file " + pathname);
return;
} else {
file = new File(catalinaBase, pathname);
}
}
if (!file.canRead()) {
log.warn("Cannot load configuration file " + file.getAbsolutePath());
return;
}
// Load the contents of our configuration file
Digester digester = new Digester();
digester.setValidating(false);
digester.addRuleSet(new MemoryRuleSet());
try {
digester.push(this);
digester.parse(file);
} catch (Exception e) {
log.warn("Error processing configuration file " + file.getAbsolutePath(), e);
} finally {
digester.reset();
}
}
private String getCatalinaBase() {
// Have to get this via a callback as that is the only link we have back
// to the defining Realm. Can't use the system property as that may not
// be set/correct in an embedded scenario
if (callbackHandler == null) {
return null;
}
Callback callbacks[] = new Callback[1];
callbacks[0] = new TextInputCallback("catalinaBase");
String result = null;
try {
callbackHandler.handle(callbacks);
result = ((TextInputCallback) callbacks[0]).getText();
} catch (IOException | UnsupportedCallbackException e) {
return null;
}
return result;
}
}