If you've lost your password and can't recover it via email but have access to the doku file system, you're still good.
Open up conf/user.auth.php
and replace the password of your user with 21232f297a57a5a743894a0e4a801fc3
, that will make the password be admin
.
this has been tested in 2015-08-10a "Detritus" version.
in /inc there is a file PassHash.class.php that does the password verification.
go to "verify_hash($clear, $hash)" function and simply add a "return true;" after the beginning.
then login with the user you want to recover. don't worry about the password you enter.
after login has succeded, go to "Update Profile" and change your password normally.
finally, go to "verify_hash($clear, $hash)" function and delete the "return true;" you added before.
from this point, everything will be back to normal: you know your new password and your wiki works as usual.