security - Codeigniter and Multiple Concurrent Logins -


i come security background infosec consultant , tested webapps vulnerabilities. i've started working webdev , i'm busy first project, written codeigniter.

i'm trying solve problem of multiple concurrent logins, user can have 2 (or more) concurrent sessions both valid , active. have idea how i'm not experienced ci want know if there's better or more "official" way. involves making changes db's ci_sessions table, not sure how ci handle it.

at moment i'm using db session data, plan add additional coloum ci_sessions table, 1 stores email address of user (post authentication). in other words null until user logs in, @ point email address of user stored in it.

the plan confirm validity of credentials provided during login , if they're correct search sessions table other sessions corresponding same email address , delete those. once other sessions user have removed email , session data indicating valid authenticated session set.

is best way this?

edit: of course, won't work when ci creates new session id current session, instead of updating, ci won't set email address new session. i'd have make modifications source...

i looking through source code sessions.php , found line @ end of sess_update(), called if db sessions in use:

$this->ci->db->query($this->ci->db->update_string($this->sess_table_name, array('last_activity' => $this->now, 'session_id' => $new_sessid), array('session_id' => $old_sessid)));

in other words current session_id updated new session_id, instead of inserting new entry, leaving other information (except last_activity) intact. decided try original plan, added user_id column table (instead of email) defaults null. on login check credentials , return (amongst others) user_id of email address specified. delete sessions have specific id in user_id column , update line associated current session_id contain user_id of user.

i have tested logging in chrome , safari , chrome session killed. still need more testing ensure there no loopholes looks solves problem.

many suggestions. samutz, i'm sure method have worked, found mine had less overhead.


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