If you need a way to launch an openvpn client that uses auth-user-pass without having to recompile openvpn with --enable-password-save you could use a simple shell script.
#!/usr/bin/expect
spawn openvpn –config /etc/openvpn/configforclient.conf
expect “*Username:*”
send “userhere\r”
expect “*Password:*”
send “passhere\r”
interact
Just replace userhere and passhere with your vpn username and password. Saving your login credentials in plain text may be a security risk. Keep that in mind!
You also have to have the expect package installed on your computer.