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/*
* 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.cassandra.auth;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import javax.security.auth.Subject;
import javax.security.auth.callback.*;
import javax.security.auth.login.FailedLoginException;
import javax.security.auth.login.LoginException;
import javax.security.auth.spi.LoginModule;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.cassandra.config.DatabaseDescriptor;
import org.apache.cassandra.exceptions.AuthenticationException;
import org.apache.cassandra.service.StorageService;
/**
* LoginModule which authenticates a user towards the Cassandra database using
* the internal authentication mechanism.
*/
public class CassandraLoginModule implements LoginModule
{
private static final Logger logger = LoggerFactory.getLogger(CassandraLoginModule.class);
// initial state
private Subject subject;
private CallbackHandler callbackHandler;
// the authentication status
private boolean succeeded = false;
private boolean commitSucceeded = false;
// username and password
private String username;
private char[] password;
private CassandraPrincipal principal;
/**
* Initialize this {@code}LoginModule{@code}.
*
* @param subject the {@code}Subject{@code} to be authenticated.
* @param callbackHandler a {@code}CallbackHandler{@code} for communicating
* with the end user (prompting for user names and passwords, for example)
* @param sharedState shared {@code}LoginModule{@code} state. This param is unused.
* @param options options specified in the login {@code}Configuration{@code} for this particular
* {@code}LoginModule{@code}. This param is unused
*/
@Override
public void initialize(Subject subject,
CallbackHandler callbackHandler,
Map sharedState,
Map options)
{
this.subject = subject;
this.callbackHandler = callbackHandler;
}
/**
* Authenticate the user, obtaining credentials from the CallbackHandler
* supplied in {@code}initialize{@code}. As long as the configured
* {@code}IAuthenticator{@code} supports the optional
* {@code}legacyAuthenticate{@code} method, it can be used here.
*
* @return true in all cases since this {@code}LoginModule{@code}
* should not be ignored.
* @exception FailedLoginException if the authentication fails.
* @exception LoginException if this {@code}LoginModule{@code} is unable to
* perform the authentication.
*/
@Override
public boolean login() throws LoginException
{
// prompt for a user name and password
if (callbackHandler == null)
{
logger.info("No CallbackHandler available for authentication");
throw new LoginException("Authentication failed");
}
NameCallback nc = new NameCallback("username: ");
PasswordCallback pc = new PasswordCallback("password: ", false);
try
{
callbackHandler.handle(new Callback[]{nc, pc});
username = nc.getName();
char[] tmpPassword = pc.getPassword();
if (tmpPassword == null)
tmpPassword = new char[0];
password = new char[tmpPassword.length];
System.arraycopy(tmpPassword, 0, password, 0, tmpPassword.length);
pc.clearPassword();
}
catch (IOException | UnsupportedCallbackException e)
{
logger.info("Unexpected exception processing authentication callbacks", e);
throw new LoginException("Authentication failed");
}
// verify the credentials
try
{
authenticate();
}
catch (AuthenticationException e)
{
// authentication failed -- clean up
succeeded = false;
cleanUpInternalState();
throw new FailedLoginException(e.getMessage());
}
succeeded = true;
return true;
}
private void authenticate()
{
if (!StorageService.instance.isAuthSetupComplete())
throw new AuthenticationException("Cannot login as server authentication setup is not yet completed");
IAuthenticator authenticator = DatabaseDescriptor.getAuthenticator();
Map credentials = new HashMap<>();
credentials.put(PasswordAuthenticator.USERNAME_KEY, username);
credentials.put(PasswordAuthenticator.PASSWORD_KEY, String.valueOf(password));
AuthenticatedUser user = authenticator.legacyAuthenticate(credentials);
// Only actual users should be allowed to authenticate for JMX
if (user.isAnonymous() || user.isSystem())
throw new AuthenticationException(String.format("Invalid user %s", user.getName()));
// The LOGIN privilege is required to authenticate - c.f. ClientState::login
if (!DatabaseDescriptor.getRoleManager().canLogin(user.getPrimaryRole()))
throw new AuthenticationException(user.getName() + " is not permitted to log in");
}
/**
* This method is called if the LoginContext's overall authentication succeeded
* (the relevant REQUIRED, REQUISITE, SUFFICIENT and OPTIONAL LoginModules
* succeeded).
*
* If this LoginModule's own authentication attempt succeeded (checked by
* retrieving the private state saved by the {@code}login{@code} method),
* then this method associates a {@code}CassandraPrincipal{@code}
* with the {@code}Subject{@code}.
* If this LoginModule's own authentication attempted failed, then this
* method removes any state that was originally saved.
*
* @return true if this LoginModule's own login and commit attempts succeeded, false otherwise.
* @exception LoginException if the commit fails.
*/
@Override
public boolean commit() throws LoginException
{
if (!succeeded)
{
return false;
}
else
{
// add a Principal (authenticated identity)
// to the Subject
principal = new CassandraPrincipal(username);
if (!subject.getPrincipals().contains(principal))
subject.getPrincipals().add(principal);
cleanUpInternalState();
commitSucceeded = true;
return true;
}
}
/**
* This method is called if the LoginContext's overall authentication failed.
* (the relevant REQUIRED, REQUISITE, SUFFICIENT and OPTIONAL LoginModules
* did not succeed).
*
* If this LoginModule's own authentication attempt succeeded (checked by
* retrieving the private state saved by the {@code}login{@code} and
* {@code}commit{@code} methods), then this method cleans up any state that
* was originally saved.
*
* @return false if this LoginModule's own login and/or commit attempts failed, true otherwise.
* @throws LoginException if the abort fails.
*/
@Override
public boolean abort() throws LoginException
{
if (!succeeded)
{
return false;
}
else if (!commitSucceeded)
{
// login succeeded but overall authentication failed
succeeded = false;
cleanUpInternalState();
principal = null;
}
else
{
// overall authentication succeeded and commit succeeded,
// but someone else's commit failed
logout();
}
return true;
}
/**
* Logout the user.
*
* This method removes the principal that was added by the
* {@code}commit{@code} method.
*
* @return true in all cases since this {@code}LoginModule{@code}
* should not be ignored.
* @throws LoginException if the logout fails.
*/
@Override
public boolean logout() throws LoginException
{
subject.getPrincipals().remove(principal);
succeeded = false;
cleanUpInternalState();
principal = null;
return true;
}
private void cleanUpInternalState()
{
username = null;
if (password != null)
{
for (int i = 0; i < password.length; i++)
password[i] = ' ';
password = null;
}
}
}