After installing openvpn, /etc/passwd doesn't contain openvpn user. The default configuration file contains user nobody to run under. I suggest user openvpn to be added and the default configuration file patched to contain openvpn instead of nobody. Using nobody decreases the security because if more programs use nobody, exploiting one means exploiting the other as well (for example the gained user can stop and attach the process and read out key material from semiconductor memory).
Fixed in openvpn-2.1_beta14
