Add a method to SimpleSAMLphp_SessionHandlerPHP to restore a session existing previously to our own session. This can be used in SimpleSAML_Session to restore the PHP session status previous to calling our API, while also guaranteeing that our session is correctly saved. The documentation has been updated to reflect this and recommend how to deal with conflicting PHP sessions. This closes #244 and resolves #349.

Bugfixes: the PHP session handler only fetches the cookie configuration parameters if session_id() returns a non-empty ID. This won't happen if the application initialized a session previously, hijacking the session and causing all kinds of trouble. Instead, we need to detect if there's an active session, save its parameters and close it. After closing it, we can name a new session and set the cookie parameters.

Bugfix: when using PHP sessions, if there's already a session, session_id() will return the identifier of that session, not our session. In that case, we need to make sure it is our session so that we don't hijack the one of the application.

Avoid the PHP session handler to generate errors when we try to retrieve a session after the headers being sent to the browser.

It's obviously more secure and therefore better as a default.

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Thanks to Synacor, Inc. for providing this patch!

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Adds options to control the various session cookie parameters, and
changes users of setcookie to use those options instead.

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This patch removes the autodetection of the secure flag for the cookie
based on whether the user is accessing simpleSAMLphp through https. The
reason for this is that the user can often access an SP through both
https and http. If the user starts with http, everything will work, but
if the user starts with https, the user will get two separate cookies,
one for https and one for http.

This patch introduces a new configuration option in config.php:

    /*
     * Set the secure flag in the cookie.
     *
     * Set this to TRUE if the user only accesses your service
     * through https. If the user can access the service through
     * both http and https, this must be set to FALSE.
     */
    'session.cookie.secure' => FALSE,

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Allow session_save_path to be overridden by setting the session.phpsession.savepath option in config.php.


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SessionHandlerPHP: Check if a key exists in the session before trying to access it (in order to avoid notice-messages in the log).


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