keywhiz.auth.cookie.CookieAuthenticator.java Source code

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Here is the source code for keywhiz.auth.cookie.CookieAuthenticator.java

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/*
 * Copyright (C) 2015 Square, Inc.
 *
 * 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 keywhiz.auth.cookie;

import com.fasterxml.jackson.databind.ObjectMapper;
import io.dropwizard.java8.auth.Authenticator;
import java.time.ZonedDateTime;
import java.util.Base64;
import java.util.Optional;
import javax.crypto.AEADBadTagException;
import javax.inject.Inject;
import javax.ws.rs.core.Cookie;
import keywhiz.auth.User;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class CookieAuthenticator implements Authenticator<Cookie, User> {
    private static final Logger logger = LoggerFactory.getLogger(CookieAuthenticator.class);

    private final ObjectMapper mapper;
    private final GCMEncryptor encryptor;

    @Inject
    public CookieAuthenticator(ObjectMapper mapper, GCMEncryptor encryptor) {
        this.mapper = mapper;
        this.encryptor = encryptor;
    }

    @Override
    public Optional<User> authenticate(Cookie cookie) {
        User user = null;

        if (cookie != null) {
            Optional<UserCookieData> cookieData = getUserCookieData(cookie);
            if (cookieData.isPresent()) {
                user = cookieData.get().getUser();
            }
        }

        return Optional.ofNullable(user);
    }

    private Optional<UserCookieData> getUserCookieData(Cookie sessionCookie) {
        byte[] ciphertext = Base64.getDecoder().decode(sessionCookie.getValue());
        UserCookieData cookieData = null;

        try {
            cookieData = mapper.readValue(encryptor.decrypt(ciphertext), UserCookieData.class);
            if (cookieData.getExpiration().isBefore(ZonedDateTime.now())) {
                cookieData = null;
            }
        } catch (AEADBadTagException e) {
            logger.warn("Cookie with bad MAC detected");
        } catch (Exception e) {
            /* this cookie ain't gettin decrypted, it's bad */ }

        return Optional.ofNullable(cookieData);
    }
}