public class SessionFixationProtectionStrategy extends Object
SessionAuthenticationStrategywhen using < Servlet 3.1.
Creates a new session for the newly authenticated user if they already have a session (as a defence against
session-fixation protection attacks), and copies their session attributes across to the new session.
The copying of the attributes can be disabled by setting
(note that even in this case, internal Spring Security attributes will still be migrated to the new session).
This approach will only be effective if your servlet container always assigns a new session Id when a session is
invalidated and a new session created by calling
The migration of existing attributes to the newly-created session may cause problems if any of the objects
HttpSessionBindingListener interface in a way which makes assumptions about the life-cycle of
the object. An example is the use of Spring session-scoped beans, where the initial removal of the bean from the
session will cause the
DisposableBean interface to be invoked, in the assumption that the bean is no longer
We'd recommend that you take account of this when designing your application and do not store attributes which
may not function correctly when they are removed and then placed back in the session. Alternatively, you should
SessionAuthenticationStrategy to deal with the issue in an application-specific way.
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Called to extract the existing attributes from the session, prior to invalidating it.
Called when a user is newly authenticated.
Called when the session has been changed and the old attributes have been migrated to the new session.
Defines whether attributes should be migrated to a new session or not.
migrateAttributesis set to
false, only Spring Security attributes will be retained. All application attributes will be discarded.
You can override this method to control exactly what is transferred to the new session.
session- the session from which the attributes should be extracted
public void setMigrateSessionAttributes(boolean migrateSessionAttributes)
Attributes used by Spring Security (to store cached requests, for example) will still be retained by default,
even if you set this value to
migrateSessionAttributes- whether the attributes from the session should be transferred to the new, authenticated session.
public void onAuthentication(Authentication authentication, javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response)
If a session already exists, and matches the session Id from the client, a new session will be created, and the
session attributes copied to it (if
migrateSessionAttributes is set).
If the client's requested session Id is invalid, nothing will be done, since there is no need to change the
session Id if it doesn't match the current session.
If there is no session, no action is taken unless the
alwaysCreateSession property is set, in which
case a session will be created if one doesn't already exist.
protected void onSessionChange(String originalSessionId, javax.servlet.http.HttpSession newSession, Authentication auth)
The default implementation of this method publishes a
SessionFixationProtectionEvent to notify
the application that the session ID has changed. If you override this method and still wish these events to be
published, you should call
super.onSessionChange() within your overriding method.
originalSessionId- the original session identifier
newSession- the newly created session
auth- the token for the newly authenticated principal
public void setApplicationEventPublisher(ApplicationEventPublisher applicationEventPublisher)
ApplicationEventPublisherto use for submitting
SessionFixationProtectionEvent. The default is to not submit the
public void setAlwaysCreateSession(boolean alwaysCreateSession)