package com.mycompany.myapp.security;
import com.mycompany.myapp.domain.PersistentToken;
import com.mycompany.myapp.domain.User;
import com.mycompany.myapp.repository.PersistentTokenRepository;
import com.mycompany.myapp.repository.UserRepository;
import org.joda.time.LocalDate;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.env.Environment;
import org.springframework.dao.DataAccessException;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.crypto.codec.Base64;
import org.springframework.security.web.authentication.rememberme.AbstractRememberMeServices;
import org.springframework.security.web.authentication.rememberme.CookieTheftException;
import org.springframework.security.web.authentication.rememberme.InvalidCookieException;
import org.springframework.security.web.authentication.rememberme.RememberMeAuthenticationException;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import javax.inject.Inject;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.security.SecureRandom;
import java.util.Arrays;
/**
* Custom implementation of Spring Security's RememberMeServices.
* <p/>
* Persistent tokens are used by Spring Security to automatically log in users.
* <p/>
* This is a specific implementation of Spring Security's remember-me authentication, but it is much
* more powerful than the standard implementations:
* <ul>
* <li>It allows a user to see the list of his currently opened sessions, and invalidate them</li>
* <li>It stores more information, such as the IP address and the user agent, for audit purposes<li>
* <li>When a user logs out, only his current session is invalidated, and not all of his sessions</li>
* </ul>
* <p/>
* This is inspired by:
* <ul>
* <li><a href="http://jaspan.com/improved_persistent_login_cookie_best_practice">Improved Persistent Login Cookie
* Best Practice</a></li>
* <li><a href="https://github.com/blog/1661-modeling-your-app-s-user-session">Github's "Modeling your App's User Session"</a></li></li>
* </ul>
* <p/>
* The main algorithm comes from Spring Security's PersistentTokenBasedRememberMeServices, but this class
* couldn't be cleanly extended.
* <p/>
*/
@Service
public class CustomPersistentRememberMeServices extends
AbstractRememberMeServices {
private final Logger log = LoggerFactory.getLogger(CustomPersistentRememberMeServices.class);
// Token is valid for one month
private static final int TOKEN_VALIDITY_DAYS = 31;
private static final int TOKEN_VALIDITY_SECONDS = 60 * 60 * 24 * TOKEN_VALIDITY_DAYS;
private static final int DEFAULT_SERIES_LENGTH = 16;
private static final int DEFAULT_TOKEN_LENGTH = 16;
private SecureRandom random;
@Inject
private PersistentTokenRepository persistentTokenRepository;
@Inject
private UserRepository userRepository;
@Inject
public CustomPersistentRememberMeServices(Environment env,
org.springframework.security.core.userdetails.UserDetailsService userDetailsService) {
super(env.getProperty("jhipster.security.rememberme.key"), userDetailsService);
random = new SecureRandom();
}
@Override
@Transactional
protected UserDetails processAutoLoginCookie(String[] cookieTokens, HttpServletRequest request, HttpServletResponse response) {
PersistentToken token = getPersistentToken(cookieTokens);
String login = token.getUser().getLogin();
// Token also matches, so login is valid. Update the token value, keeping the *same* series number.
log.debug("Refreshing persistent login token for user '{}', series '{}'", login, token.getSeries());
token.setTokenDate(new LocalDate());
token.setTokenValue(generateTokenData());
token.setIpAddress(request.getRemoteAddr());
token.setUserAgent(request.getHeader("User-Agent"));
try {
persistentTokenRepository.saveAndFlush(token);
addCookie(token, request, response);
} catch (DataAccessException e) {
log.error("Failed to update token: ", e);
throw new RememberMeAuthenticationException("Autologin failed due to data access problem: " + e.getMessage());
}
return getUserDetailsService().loadUserByUsername(login);
}
@Override
protected void onLoginSuccess(HttpServletRequest request, HttpServletResponse response, Authentication successfulAuthentication) {
String login = successfulAuthentication.getName();
log.debug("Creating new persistent login for user {}", login);
User user = userRepository.findOne(login);
PersistentToken token = new PersistentToken();
token.setSeries(generateSeriesData());
token.setUser(user);
token.setTokenValue(generateTokenData());
token.setTokenDate(new LocalDate());
token.setIpAddress(request.getRemoteAddr());
token.setUserAgent(request.getHeader("User-Agent"));
try {
persistentTokenRepository.saveAndFlush(token);
addCookie(token, request, response);
} catch (DataAccessException e) {
log.error("Failed to save persistent token ", e);
}
}
/**
* When logout occurs, only invalidate the current token, and not all user sessions.
* <p/>
* The standard Spring Security implementations are too basic: they invalidate all tokens for the
* current user, so when he logs out from one browser, all his other sessions are destroyed.
*/
@Override
@Transactional
public void logout(HttpServletRequest request, HttpServletResponse response, Authentication authentication) {
String rememberMeCookie = extractRememberMeCookie(request);
if (rememberMeCookie != null && rememberMeCookie.length() != 0) {
try {
String[] cookieTokens = decodeCookie(rememberMeCookie);
PersistentToken token = getPersistentToken(cookieTokens);
persistentTokenRepository.delete(token);
} catch (InvalidCookieException ice) {
log.info("Invalid cookie, no persistent token could be deleted");
} catch (RememberMeAuthenticationException rmae) {
log.debug("No persistent token found, so no token could be deleted");
}
}
super.logout(request, response, authentication);
}
/**
* Validate the token and return it.
*/
private PersistentToken getPersistentToken(String[] cookieTokens) {
if (cookieTokens.length != 2) {
throw new InvalidCookieException("Cookie token did not contain " + 2 +
" tokens, but contained '" + Arrays.asList(cookieTokens) + "'");
}
final String presentedSeries = cookieTokens[0];
final String presentedToken = cookieTokens[1];
PersistentToken token = persistentTokenRepository.findOne(presentedSeries);
if (token == null) {
// No series match, so we can't authenticate using this cookie
throw new RememberMeAuthenticationException("No persistent token found for series id: " + presentedSeries);
}
// We have a match for this user/series combination
log.info("presentedToken={} / tokenValue={}", presentedToken, token.getTokenValue());
if (!presentedToken.equals(token.getTokenValue())) {
// Token doesn't match series value. Delete this session and throw an exception.
persistentTokenRepository.delete(token);
throw new CookieTheftException("Invalid remember-me token (Series/token) mismatch. Implies previous cookie theft attack.");
}
if (token.getTokenDate().plusDays(TOKEN_VALIDITY_DAYS).isBefore(LocalDate.now())) {
persistentTokenRepository.delete(token);
throw new RememberMeAuthenticationException("Remember-me login has expired");
}
return token;
}
private String generateSeriesData() {
byte[] newSeries = new byte[DEFAULT_SERIES_LENGTH];
random.nextBytes(newSeries);
return new String(Base64.encode(newSeries));
}
private String generateTokenData() {
byte[] newToken = new byte[DEFAULT_TOKEN_LENGTH];
random.nextBytes(newToken);
return new String(Base64.encode(newToken));
}
private void addCookie(PersistentToken token, HttpServletRequest request, HttpServletResponse response) {
setCookie(
new String[]{token.getSeries(), token.getTokenValue()},
TOKEN_VALIDITY_SECONDS, request, response);
}
}