Hi Jeremie,
just for testing I could fetch the username and password variables passed by the client by setting the folllowing lines in my openvpn.conf:
tmp-dir /dev/shm
auth-user-pass-verify connect.sh via-file
In the connect.sh shell script I put the following line:
cat $1 > /some_file/somewhere
username and password values will be stored as clear text in the output file.
I hope it helps.
ROM