io.micronaut.configuration.security.ldap.LdapAuthenticationProvider Maven / Gradle / Ivy

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/*
 * Copyright 2017-2020 original authors
 *
 * 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 io.micronaut.configuration.security.ldap;

import io.micronaut.configuration.security.ldap.configuration.LdapConfiguration;
import io.micronaut.configuration.security.ldap.context.ContextBuilder;
import io.micronaut.configuration.security.ldap.context.LdapSearchResult;
import io.micronaut.configuration.security.ldap.context.LdapSearchService;
import io.micronaut.configuration.security.ldap.group.LdapGroupProcessor;
import io.micronaut.security.authentication.*;
import io.reactivex.Flowable;
import org.reactivestreams.Publisher;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.naming.AuthenticationException;
import javax.naming.NamingException;
import javax.naming.directory.DirContext;
import java.io.Closeable;
import java.util.Collections;
import java.util.Optional;
import java.util.Set;

/**
 * Authenticates against an LDAP server using the configuration provided through
 * {@link LdapConfiguration}. One provider will be created for each configuration.
 *
 * @author James Kleeh
 * @since 1.0
 */
public class LdapAuthenticationProvider implements AuthenticationProvider, Closeable {

    private static final Logger LOG = LoggerFactory.getLogger(LdapAuthenticationProvider.class);

    private final LdapConfiguration configuration;
    private final LdapSearchService ldapSearchService;
    private final ContextBuilder contextBuilder;
    private final ContextAuthenticationMapper contextAuthenticationMapper;
    private final LdapGroupProcessor ldapGroupProcessor;

    /**
     * @param configuration               The configuration to use to authenticate
     * @param ldapSearchService           The search service
     * @param contextBuilder              The context builder
     * @param contextAuthenticationMapper The authentication mapper
     * @param ldapGroupProcessor          The group processor
     */
    public LdapAuthenticationProvider(LdapConfiguration configuration,
                                      LdapSearchService ldapSearchService,
                                      ContextBuilder contextBuilder,
                                      ContextAuthenticationMapper contextAuthenticationMapper,
                                      LdapGroupProcessor ldapGroupProcessor) {
        this.configuration = configuration;
        this.ldapSearchService = ldapSearchService;
        this.contextBuilder = contextBuilder;
        this.contextAuthenticationMapper = contextAuthenticationMapper;
        this.ldapGroupProcessor = ldapGroupProcessor;
    }

    @Override
    public Publisher authenticate(AuthenticationRequest authenticationRequest) {
        String username = authenticationRequest.getIdentity().toString();
        String password = authenticationRequest.getSecret().toString();

        if (LOG.isDebugEnabled()) {
            LOG.debug("Starting authentication with configuration [{}]", configuration.getName());
        }

        if (LOG.isDebugEnabled()) {
            LOG.debug("Attempting to initialize manager context");
        }
        DirContext managerContext;
        try {
            managerContext = contextBuilder.build(configuration.getManagerSettings());
            if (LOG.isDebugEnabled()) {
                LOG.debug("Manager context initialized successfully");
            }
        } catch (NamingException e) {
            if (LOG.isDebugEnabled()) {
                LOG.debug("Failed to create manager context. Returning unknown authentication failure. Encountered {}", e);
            }
            return Flowable.just(new AuthenticationFailed(AuthenticationFailureReason.UNKNOWN));
        }

        if (LOG.isDebugEnabled()) {
            LOG.debug("Attempting to authenticate with user [{}]", username);
        }

        AuthenticationResponse response = new AuthenticationFailed(AuthenticationFailureReason.USER_NOT_FOUND);

        try {
            Optional optionalResult = ldapSearchService.searchFirst(managerContext, configuration.getSearch().getSettings(new Object[]{username}));

            if (optionalResult.isPresent()) {
                LdapSearchResult result = optionalResult.get();
                if (LOG.isDebugEnabled()) {
                    LOG.debug("User found in context [{}]. Attempting to bind.", result.getDn());
                }

                DirContext userContext = null;
                try {
                    String dn = result.getDn();
                    userContext = contextBuilder.build(configuration.getSettings(result.getDn(), password));
                    if (result.getAttributes() == null) {
                        result.setAttributes(userContext.getAttributes(dn));
                    }
                } finally {
                    contextBuilder.close(userContext);
                }

                if (LOG.isDebugEnabled()) {
                    LOG.debug("Successfully bound user [{}]. Attempting to retrieving groups.", result.getDn());
                }

                Set groups = Collections.emptySet();

                LdapConfiguration.GroupConfiguration groupSettings = configuration.getGroups();
                if (groupSettings.isEnabled()) {
                    groups = ldapGroupProcessor.process(groupSettings.getAttribute(), result, () -> {
                        return ldapSearchService.search(managerContext, groupSettings.getSearchSettings(new Object[]{result.getDn()}));
                    });

                    if (LOG.isDebugEnabled()) {
                        LOG.debug("Group search returned [{}] for user [{}]", groups, username);
                    }
                } else {
                    if (LOG.isDebugEnabled()) {
                        LOG.debug("Group search is disabled for configuration [{}]", configuration.getName());
                    }
                }

                if (LOG.isTraceEnabled()) {
                    LOG.trace("Attempting to map [{}] with groups [{}] to an authentication response.", username, groups);
                }

                response = contextAuthenticationMapper.map(result.getAttributes(), username, groups);

                if (LOG.isDebugEnabled()) {
                    LOG.debug("Response successfully created for [{}]. Response is authenticated: [{}]", username, response.isAuthenticated());
                }
            } else {
                if (LOG.isDebugEnabled()) {
                    LOG.debug("User not found [{}]", username);
                }
            }
        } catch (NamingException e) {
            if (LOG.isDebugEnabled()) {
                LOG.debug("Failed to authenticate with user [{}].  {}", username, e);
            }
            if (e instanceof AuthenticationException) {
                response = new AuthenticationFailed(AuthenticationFailureReason.CREDENTIALS_DO_NOT_MATCH);
            }
        } finally {
            contextBuilder.close(managerContext);
        }
        return Flowable.just(response);
    }

    @Override
    public void close() { }
}