auth_tkt is a Roundcube webmail plugin that sets and clears cookies for the Apache mod_auth_tkt module.
This allows Apache authenticate users to other systems by merit of their Roundcube login in a simple SSO manner.
It also redirects to the 'back' URL that mod_auth_tkt provides, if present.
See https://github.com/gavincarr/mod_auth_tkt for more about mod_auth_tkt.
This code includes the hash construction function from PHP contributions to that project.
Released under ASL. See LICENSE for details.
Jon Stuart, jon@zomo.co.uk, Zomo Technology Ltd, 2014.