com.spotify.helios.authentication.crtauth.LdapKeyProvider.java Source code

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Here is the source code for com.spotify.helios.authentication.crtauth.LdapKeyProvider.java

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/*
 * Copyright (c) 2015 Spotify AB.
 *
 * 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 com.spotify.helios.authentication.crtauth;

import com.google.common.base.Preconditions;

import com.spotify.crtauth.exceptions.KeyNotFoundException;
import com.spotify.crtauth.keyprovider.KeyProvider;
import com.spotify.crtauth.utils.TraditionalKeyParser;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.ldap.core.AttributesMapper;
import org.springframework.ldap.core.LdapTemplate;

import java.security.InvalidKeyException;
import java.security.KeyFactory;
import java.security.NoSuchAlgorithmException;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.RSAPublicKeySpec;
import java.util.List;

import javax.naming.NamingException;
import javax.naming.directory.Attributes;

import static org.springframework.ldap.query.LdapQueryBuilder.query;

/**
 * Returns user data from an LDAP directory.
 */
public class LdapKeyProvider implements KeyProvider {

    private static final Logger log = LoggerFactory.getLogger(LdapKeyProvider.class);

    private final LdapTemplate ldapTemplate;
    private final String baseSearchPath;

    public LdapKeyProvider(final LdapTemplate ldapTemplate, final String baseSearchPath) {
        this.ldapTemplate = Preconditions.checkNotNull(ldapTemplate);
        this.baseSearchPath = Preconditions.checkNotNull(baseSearchPath);
    }

    @Override
    public RSAPublicKey getKey(final String username) throws KeyNotFoundException {
        final List<String> result = ldapTemplate.search(query().base(baseSearchPath).where("uid").is(username),
                new AttributesMapper<String>() {
                    @Override
                    public String mapFromAttributes(final Attributes attributes) throws NamingException {
                        log.debug("got ldap stuff for uid {}", username);
                        return attributes.get("sshPublicKey").toString();
                    }
                });

        if (result.isEmpty()) {
            throw new KeyNotFoundException();
        } else if (result.size() == 1) {
            final String r = result.get(0);
            RSAPublicKeySpec publicKeySpec;
            try {
                final String sshPublicKey = r.replace("sshPublicKey: ", "");
                publicKeySpec = TraditionalKeyParser.parsePemPublicKey(sshPublicKey);
                final KeyFactory keyFactory = KeyFactory.getInstance("RSA");
                return (RSAPublicKey) keyFactory.generatePublic(publicKeySpec);
            } catch (InvalidKeyException | InvalidKeySpecException | NoSuchAlgorithmException e) {
                e.printStackTrace();
            }

        }

        throw new IllegalStateException("Found more than one LDAP user for name: " + username);
    }
}