Class TokenBasedRememberMeServices

  • All Implemented Interfaces:
    org.springframework.beans.factory.Aware, org.springframework.beans.factory.InitializingBean, org.springframework.context.MessageSourceAware, LogoutHandler, RememberMeServices

    public class TokenBasedRememberMeServices
    extends AbstractRememberMeServices
    Identifies previously remembered users by a Base-64 encoded cookie.

    This implementation does not rely on an external database, so is attractive for simple applications. The cookie will be valid for a specific period from the date of the last AbstractRememberMeServices.loginSuccess(HttpServletRequest, HttpServletResponse, Authentication). As per the interface contract, this method will only be called when the principal completes a successful interactive authentication. As such the time period commences from the last authentication attempt where they furnished credentials - not the time period they last logged in via remember-me. The implementation will only send a remember-me token if the parameter defined by AbstractRememberMeServices.setParameter(String) is present.

    An UserDetailsService is required by this implementation, so that it can construct a valid Authentication from the returned UserDetails. This is also necessary so that the user's password is available and can be checked as part of the encoded cookie.

    The cookie encoded by this implementation adopts the following form:

     username + ":" + expiryTime + ":"
                    + Md5Hex(username + ":" + expiryTime + ":" + password + ":" + key)

    As such, if the user changes their password, any remember-me token will be invalidated. Equally, the system administrator may invalidate every remember-me token on issue by changing the key. This provides some reasonable approaches to recovering from a remember-me token being left on a public machine (e.g. kiosk system, Internet cafe etc). Most importantly, at no time is the user's password ever sent to the user agent, providing an important security safeguard. Unfortunately the username is necessary in this implementation (as we do not want to rely on a database for remember-me services). High security applications should be aware of this occasionally undesired disclosure of a valid username.

    This is a basic remember-me implementation which is suitable for many applications. However, we recommend a database-based implementation if you require a more secure remember-me approach (see PersistentTokenBasedRememberMeServices).

    By default the tokens will be valid for 14 days from the last successful authentication attempt. This can be changed using AbstractRememberMeServices.setTokenValiditySeconds(int). If this value is less than zero, the expiryTime will remain at 14 days, but the negative value will be used for the maxAge property of the cookie, meaning that it will not be stored when the browser is closed.

    • Constructor Detail

      • TokenBasedRememberMeServices

        public TokenBasedRememberMeServices​(java.lang.String key,
                                            UserDetailsService userDetailsService)
    • Method Detail

      • processAutoLoginCookie

        protected UserDetails processAutoLoginCookie​(java.lang.String[] cookieTokens,
                                                     javax.servlet.http.HttpServletRequest request,
                                                     javax.servlet.http.HttpServletResponse response)
        Description copied from class: AbstractRememberMeServices
        Called from autoLogin to process the submitted persistent login cookie. Subclasses should validate the cookie and perform any additional management required.
        Specified by:
        processAutoLoginCookie in class AbstractRememberMeServices
        cookieTokens - the decoded and tokenized cookie value
        request - the request
        response - the response, to allow the cookie to be modified if required.
        the UserDetails for the corresponding user account if the cookie was validated successfully.
      • makeTokenSignature

        protected java.lang.String makeTokenSignature​(long tokenExpiryTime,
                                                      java.lang.String username,
                                                      java.lang.String password)
        Calculates the digital signature to be put in the cookie. Default value is MD5 ("username:tokenExpiryTime:password:key")
      • isTokenExpired

        protected boolean isTokenExpired​(long tokenExpiryTime)
      • onLoginSuccess

        public void onLoginSuccess​(javax.servlet.http.HttpServletRequest request,
                                   javax.servlet.http.HttpServletResponse response,
                                   Authentication successfulAuthentication)
        Description copied from class: AbstractRememberMeServices
        Called from loginSuccess when a remember-me login has been requested. Typically implemented by subclasses to set a remember-me cookie and potentially store a record of it if the implementation requires this.
        Specified by:
        onLoginSuccess in class AbstractRememberMeServices
      • calculateLoginLifetime

        protected int calculateLoginLifetime​(javax.servlet.http.HttpServletRequest request,
                                             Authentication authentication)
        Calculates the validity period in seconds for a newly generated remember-me login. After this period (from the current time) the remember-me login will be considered expired. This method allows customization based on request parameters supplied with the login or information in the Authentication object. The default value is just the token validity period property, tokenValiditySeconds.

        The returned value will be used to work out the expiry time of the token and will also be used to set the maxAge property of the cookie. See SEC-485.

        request - the request passed to onLoginSuccess
        authentication - the successful authentication object.
        the lifetime in seconds.
      • retrieveUserName

        protected java.lang.String retrieveUserName​(Authentication authentication)
      • retrievePassword

        protected java.lang.String retrievePassword​(Authentication authentication)