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I want OpenVPN to run a script when a client connects, but it seems to ignore my client-connect directive.

I am running OpenVPN 2.4.0 on Raspbian. In my server.conf, I have

...
script-security 3
# this is the "up" directive but the issue is the same as with client-connect
up /etc/openvpn/up.sh
...

/etc/openvpn/up.sh is owned by root by world-executable (rwxr-xr-x), and it is as simple as

#!/bin/sh
whoami >> /tmp/connect.txt
exit 0

I can successfully connect to my server, /var/log/daemon.log even states ovpn-server[2050]: /etc/openvpn/up.sh tun0 1500 1621 10.100.0.1 10.100.0.2 init without stating any error, yet nothing appears on /tmp, as if my script was not called.

What is going wrong?

  • FWIW, here is my full server.conf port 1194 proto udp dev tun ca /etc/openvpn/certs/keys/ca.crt cert /etc/openvpn/certs/keys/....crt key /etc/openvpn/certs/keys/...key dh /etc/openvpn/certs/....pem server 10.100.0.0 255.255.255.0 ifconfig-pool-persist ipp.txt push "redirect-gateway def1" push "dhcp-option DNS ..." push "dhcp-option DNS ..." script-security 3 up /etc/openvpn/up.sh keepalive 10 120 tls-auth /etc/openvpn/certs/keys/ta.key 0 cipher AES-256-CBC persist-key persist-tun status openvpn-status.log verb 9 explicit-exit-notify 1 auth ... tls-cipher ... – Daladim Jan 6 at 14:32
  • Sorry for the missing newlines :D – Daladim Jan 6 at 14:32
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I'm eventually replying to myself.

OpenVPN was launched as a systemd service (target?), and its config file stated PrivateTmp=true. So it did work and the script was actually run, but it did not write in the actual /tmp folder.

And by the way, one should also use the full path to the binaries (e.g. /usr/bin/whoami), since the $PATH of the executed script may not be the same as the one of regular shells.

  • And, for a production system, script-security 2 is enough. And the script does not need to be world-executable, just executable by openvpn's user. – Daladim Jan 6 at 21:48

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