/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2013, Red Hat, Inc., and individual contributors
 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

package org.jboss.as.domain.management.security.realms;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;

import java.io.IOException;
import java.util.List;
import java.util.Set;

import javax.naming.directory.DirContext;
import javax.security.auth.callback.Callback;
import javax.security.auth.callback.NameCallback;
import javax.security.sasl.RealmCallback;

import org.jboss.as.domain.management.AuthMechanism;
import org.jboss.as.domain.management.AuthorizingCallbackHandler;
import org.jboss.as.domain.management.SecurityRealm;
import org.jboss.as.domain.management.connections.ldap.LdapConnectionManager;
import org.jboss.as.domain.management.security.operations.SecurityRealmAddBuilder;
import org.jboss.as.domain.management.security.operations.CacheBuilder.By;
import org.jboss.dmr.ModelNode;
import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Test;
import org.wildfly.security.auth.callback.EvidenceVerifyCallback;
import org.wildfly.security.evidence.PasswordGuessEvidence;

/**
 * A test case to test authentication against an LDAP server.
 *
 * @see LdapTestSuite
 *
 * @author <a href="mailto:darran.lofthouse@jboss.com">Darran Lofthouse</a>
 */
public class LdapAuthenticationSuiteTest extends BaseLdapSuiteTest {

    private static final String ADVANCED_REALM = "AdvancedRealm";

    private static final String BASE_DN = "dc=simple,dc=wildfly,dc=org";
    private static final String ADVANCED_FILTER = "(&(uid={0})(departmentNumber=1))";
    private static final String USERNAME_FILTER = "uid";

    private static final String USER_ONE = "user_one";
    private static final String USER_ONE_PASSWORD = "one_password";
    private static final String USER_TWO = "user_two";
    private static final String USER_TWO_PASSWORD = "two_password";
    private static final String USER_THREE = "referral_user_three";
    private static final String USER_THREE_PASSWORD = "three_password";

    private static boolean initialised;

    @BeforeClass
    public static void startLdapServer() throws Exception {
        initialised = LdapTestSuite.startLdapServers(false);
    }

    @AfterClass
    public static void stopLdapServer() throws Exception {
        if (initialised) {
            LdapTestSuite.stopLdapServers();
        }
    }

    @Test
    public void testConnection() throws Exception {
        LdapConnectionManager connectionManager = getConnectionManager(MASTER_CONNECTION_NAME);
        assertNotNull("Connection Manager.", connectionManager);
        // Configured Credentials.
        DirContext connection = connectionManager.getConnection();
        assertNotNull("Connection with configured credentials.", connection);
        connection.close();
        // Supplied Credentials.
        connectionManager.verifyIdentity("uid=UserOne,dc=simple,dc=wildfly,dc=org","one_password");

        // Bad Supplied Credentials.
        try {
            connectionManager.verifyIdentity("uid=UserOne,dc=simple,dc=wildfly,dc=org","bad_password");
            fail("Expected exception not thrown.");
        } catch (Exception ignored) {}
    }

    @Test
    public void testSupportedMechanism() {
        Set<AuthMechanism> supportedMechs = securityRealm.getSupportedAuthenticationMechanisms();
        assertEquals("Number of mechanims", 1, supportedMechs.size());
        assertTrue("Supports Digest", supportedMechs.contains(AuthMechanism.PLAIN));
    }


    @Test
    public void testVerifyGoodPassword() throws Exception {
        AuthorizingCallbackHandler cbh = securityRealm.getAuthorizingCallbackHandler(AuthMechanism.PLAIN);

        NameCallback ncb = new NameCallback("Username", USER_ONE);
        RealmCallback rcb = new RealmCallback("Realm", TEST_REALM);
        EvidenceVerifyCallback evc = new EvidenceVerifyCallback(new PasswordGuessEvidence(USER_ONE_PASSWORD.toCharArray()));

        cbh.handle(new Callback[] { ncb, rcb, evc });

        assertTrue("Password Verified", evc.isVerified());
    }

    @Test
    public void testVerifyGoodPassword_UserTwo() throws Exception {
        /*
         * Essentially a duplicate of the previous test but we want to be sure this works as we later
         * test that this user can be excluded using an advanced filter.
         */
        AuthorizingCallbackHandler cbh = securityRealm.getAuthorizingCallbackHandler(AuthMechanism.PLAIN);

        NameCallback ncb = new NameCallback("Username", USER_TWO);
        RealmCallback rcb = new RealmCallback("Realm", TEST_REALM);
        EvidenceVerifyCallback evc = new EvidenceVerifyCallback(new PasswordGuessEvidence(USER_TWO_PASSWORD.toCharArray()));

        cbh.handle(new Callback[] { ncb, rcb, evc });

        assertTrue("Password Verified", evc.isVerified());
    }

    @Test
    public void testVerifyBadPassword() throws Exception {
        AuthorizingCallbackHandler cbh = securityRealm.getAuthorizingCallbackHandler(AuthMechanism.PLAIN);

        NameCallback ncb = new NameCallback("Username", USER_ONE);
        RealmCallback rcb = new RealmCallback("Realm", TEST_REALM);
        EvidenceVerifyCallback evc = new EvidenceVerifyCallback(new PasswordGuessEvidence(USER_TWO_PASSWORD.toCharArray()));

        cbh.handle(new Callback[] { ncb, rcb, evc });

        assertFalse("Password Not Verified", evc.isVerified());
    }


    @Test
    public void testVerifyNonExistentUser() throws Exception {
        AuthorizingCallbackHandler cbh = securityRealm.getAuthorizingCallbackHandler(AuthMechanism.PLAIN);

        NameCallback ncb = new NameCallback("Username", "UserThree");
        RealmCallback rcb = new RealmCallback("Realm", TEST_REALM);
        EvidenceVerifyCallback evc = new EvidenceVerifyCallback(new PasswordGuessEvidence("three-password".toCharArray()));

        try {
            cbh.handle(new Callback[] { ncb, rcb, evc });
            fail("Expected exception not thrown");
        } catch (IOException e) {
        }
    }

    @Test
    public void testVerifyEmptyPassword() throws Exception {
        AuthorizingCallbackHandler cbh = securityRealm.getAuthorizingCallbackHandler(AuthMechanism.PLAIN);

        NameCallback ncb = new NameCallback("Username", USER_ONE);
        RealmCallback rcb = new RealmCallback("Realm", TEST_REALM);
        EvidenceVerifyCallback evc = new EvidenceVerifyCallback(new PasswordGuessEvidence("".toCharArray()));

        try {
            cbh.handle(new Callback[] { ncb, rcb, evc });
            fail("Expected exception not thrown");
        } catch (IOException e) {
        }
    }

    @Test
    public void testVerifyIgnoredReferral() throws Exception {
        AuthorizingCallbackHandler cbh = securityRealm.getAuthorizingCallbackHandler(AuthMechanism.PLAIN);

        NameCallback ncb = new NameCallback("Username", USER_THREE);
        RealmCallback rcb = new RealmCallback("Realm", TEST_REALM);
        EvidenceVerifyCallback evc = new EvidenceVerifyCallback(new PasswordGuessEvidence(USER_THREE_PASSWORD.toCharArray()));

        cbh.handle(new Callback[] { ncb, rcb, evc });
        assertFalse("Password Not Verified", evc.isVerified());
    }

    /*
     * Custom Realm, also filter by additional attribute.
     */

    private AuthorizingCallbackHandler getAdvancedCallbackHandler() {
        return SecurityRealmHelper.getSecurityRealm(getContainer(), SecurityRealm.ServiceUtil.createServiceName(ADVANCED_REALM))
                .getAuthorizingCallbackHandler(AuthMechanism.PLAIN);
    }

    @Test
    public void testVerifyGoodPassword_Advanced() throws Exception {
        AuthorizingCallbackHandler cbh = getAdvancedCallbackHandler();

        NameCallback ncb = new NameCallback("Username", USER_ONE);
        RealmCallback rcb = new RealmCallback("Realm", TEST_REALM);
        EvidenceVerifyCallback evc = new EvidenceVerifyCallback(new PasswordGuessEvidence(USER_ONE_PASSWORD.toCharArray()));

        cbh.handle(new Callback[] { ncb, rcb, evc });

        assertTrue("Password Verified", evc.isVerified());
    }

    @Test
    public void testVerifyBadPassword_Advanced() throws Exception {
        AuthorizingCallbackHandler cbh = getAdvancedCallbackHandler();

        NameCallback ncb = new NameCallback("Username", USER_ONE);
        RealmCallback rcb = new RealmCallback("Realm", TEST_REALM);
        EvidenceVerifyCallback evc = new EvidenceVerifyCallback(new PasswordGuessEvidence(USER_TWO_PASSWORD.toCharArray()));

        cbh.handle(new Callback[] { ncb, rcb, evc });

        assertFalse("Password Not Verified", evc.isVerified());
    }

    @Test
    public void testVerifyFilteredOutUser() throws Exception {
        AuthorizingCallbackHandler cbh = getAdvancedCallbackHandler();

        NameCallback ncb = new NameCallback("Username", USER_TWO);
        RealmCallback rcb = new RealmCallback("Realm", TEST_REALM);
        EvidenceVerifyCallback evc = new EvidenceVerifyCallback(new PasswordGuessEvidence(USER_TWO_PASSWORD.toCharArray()));

        try {
            cbh.handle(new Callback[] { ncb, rcb, evc });
            fail("Expected exception not thrown");
        } catch (IOException e) {
        }
    }

    @Override
    protected void addBootOperations(List<ModelNode> bootOperations) throws Exception {
        // The super implementation of this method calls initialiseRealm for the realm
        // being used for testing, however the connection to the LDAP server should be
        // defined here.
        super.addBootOperations(bootOperations);

        // We define a second realm here as well.
        bootOperations.add(SecurityRealmAddBuilder.builder(ADVANCED_REALM)
                .authentication().ldap()
                .setConnection(MASTER_CONNECTION_NAME)
                .setBaseDn(BASE_DN)
                .setAdvancedFilter(ADVANCED_FILTER)
                .cache()
                .setBy(By.ACCESS_TIME)
                .setEvictionTime(1)
                .setMaxCacheSize(1)
                .build().build().build().build());
    }

    @Override
    protected void initialiseRealm(SecurityRealmAddBuilder builder) throws Exception {
        builder.authentication()
                .ldap()
                .setConnection(MASTER_CONNECTION_NAME)
                .setBaseDn(BASE_DN)
                .setUsernameFilter(USERNAME_FILTER)
                .cache()
                .setBy(By.SEARCH_TIME)
                .setEvictionTime(1)
                .setMaxCacheSize(1)
                .build().build().build();
    }

}
