This project is an authentication backend for Dokuwiki, which allows it to use Drupal 7's authentication. If the user logs in via Drupal, they will also be authenticated to Dokuwiki, however they can also log into Dokuwiki on its own. I've tested it with Dokuwiki 'Rincewind', and Drupal 7.7-10 myself, so please contact me if you have any successes/failures with other installations. This plugin will not work for Drupal 6 or less, and I have not tested it with 8, and will not do so until a final release is made.
If you have any problems, whether usage or compatibility based, feel free to contact me by opening an issue on Github.
The code is available here.
n00b