management/server/src/main/java/org/apache/karaf/management/JaasAuthenticator.java

/*
 * 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.karaf.management;

import javax.security.auth.callback.Callback;

import com.sun.jdmk.security.sasl.AuthenticateCallback;
import org.apache.karaf.jaas.boot.principal.ClientPrincipal;
import org.apache.karaf.jaas.boot.principal.RolePrincipal;

import java.io.IOException;
import java.rmi.server.RemoteServer;
import java.security.Principal;

import javax.management.remote.JMXAuthenticator;
import javax.security.auth.Subject;
import javax.security.auth.callback.CallbackHandler;
import javax.security.auth.callback.NameCallback;
import javax.security.auth.callback.PasswordCallback;
import javax.security.auth.callback.UnsupportedCallbackException;
import javax.security.auth.login.FailedLoginException;
import javax.security.auth.login.LoginContext;
import javax.security.auth.login.LoginException;
import javax.security.sasl.AuthorizeCallback;

public class JaasAuthenticator implements JMXAuthenticator, CallbackHandler {

    private String realm;

    public String getRealm() {
        return realm;
    }

    public void setRealm(String realm) {
        this.realm = realm;
    }

    public Subject authenticate(Object credentials) throws SecurityException {
        if (!(credentials instanceof String[])) {
            throw new IllegalArgumentException("Expected String[2], got "
                            + (credentials != null ? credentials.getClass().getName() : null));
        }

        final String[] params = (String[]) credentials;
        if (params.length != 2) {
            throw new IllegalArgumentException("Expected String[2] but length was " + params.length);
        }
        try {
            Subject subject = new Subject();
            try {
                subject.getPrincipals().add(new ClientPrincipal("jmx", RemoteServer.getClientHost()));
            } catch (Throwable t) {
                // Ignore
            }
            LoginContext loginContext = new LoginContext(realm, subject, callbacks -> {
                for (Callback callback : callbacks) {
                    if (callback instanceof NameCallback) {
                        ((NameCallback) callback).setName(params[0]);
                    } else if (callback instanceof PasswordCallback) {
                        ((PasswordCallback) callback).setPassword((params[1].toCharArray()));
                    } else {
                        throw new UnsupportedCallbackException(callback);
                    }
                }
            });
            loginContext.login();

            int roleCount = 0;
            for (Principal principal : subject.getPrincipals()) {
                if (principal instanceof RolePrincipal) {
                    roleCount++;
                }
            }

            if (roleCount == 0) {
                throw new FailedLoginException("User doesn't have role defined");
            }

            return subject;
        } catch (LoginException e) {
            throw new SecurityException("Authentication failed", e);
        }
    }

    @Override
    public void handle(Callback[] callbacks) throws IOException, UnsupportedCallbackException {
        for (int i = 0; i < callbacks.length; i++) {
            if (callbacks[i] instanceof AuthenticateCallback) {
                AuthenticateCallback acb = (AuthenticateCallback) callbacks[i];
                Subject subject = new Subject();
                try {
                    subject.getPrincipals().add(new ClientPrincipal("jmx", RemoteServer.getClientHost()));
                } catch (Throwable t) {
                    // Ignore
                }
                try {
                    LoginContext loginContext = new LoginContext(realm, subject, cb -> {
                        for (Callback callback : cb) {
                            if (callback instanceof NameCallback) {
                                ((NameCallback) callback).setName(acb.getAuthenticationID());
                            } else if (callback instanceof PasswordCallback) {
                                ((PasswordCallback) callback).setPassword((acb.getPassword()));
                            } else {
                                throw new UnsupportedCallbackException(callback);
                            }
                        }
                    });
                    loginContext.login();
                } catch (Exception e) {
                    throw new SecurityException("Authentication failed", e);
                }
                int roleCount = 0;
                for (Principal principal : subject.getPrincipals()) {
                    if (principal instanceof RolePrincipal) {
                        roleCount++;
                    }
                }

                if (roleCount == 0) {
                    throw new SecurityException("User doesn't have role defined");
                }
                acb.setAuthenticated(true);
            } else if (callbacks[i] instanceof AuthorizeCallback) {
                AuthorizeCallback acb = (AuthorizeCallback) callbacks[i];
                acb.setAuthorized(true);
            } else {
                throw new UnsupportedCallbackException(callbacks[i]);
            }
        }
    }

}