OpenVPN + PAM + Freeradius

Situation: I have fully configured and working Freeradius server. Installed OVPN 2.6.4 on other server. And goal is auth through Radius. Installed pam-radius-auth. Configured (confs below). Authentication is working just fine, but there are no Accounting packets from OVPN. When I'm trying pamtester - everyting is ok, accounting is here, but when I connected OVPN - no.

/etc/pam.d/ovpn

account required      pam_radius_auth.so
auth    required      pam_radius_auth.so conf=/etc/pam.d/pam_radius_auth.conf debug
session required      pam_radius_auth.so

/etc/pam.d/pam_radius_auth.conf

<My Radius server ip>  <Shared secret>       3

/etc/openvpn/server/server.conf

setenv deferred_auth_pam 1
plugin /usr/lib/x86_64-linux-gnu/openvpn/plugins/openvpn-plugin-auth-pam.so ovpn
verify-client-cert none
key-direction 0
local *<IPaddr>*
port 1194
proto udp
dev tun
ca ca.crt
cert server.crt
key server.key
dh dh.pem
auth SHA256
tls-crypt tc.key
topology subnet
server 10.8.0.0 255.255.255.0
server-ipv6 fddd:1194:1194:1194::/64
push "redirect-gateway def1 ipv6 bypass-dhcp"
ifconfig-pool-persist ipp.txt
push "dhcp-option DNS 67.207.67.3"
push "dhcp-option DNS 67.207.67.2"
push "block-outside-dns"
push "explicit-exit-notify 3"
keepalive 10 120
cipher AES-128-GCM
user nobody
group nogroup
persist-key
persist-tun
verb 3
crl-verify crl.pem
explicit-exit-notify 1
management 127.0.0.1 7555
log-append /var/log/openvpn/openvpn.log
txqueuelen 4000
mute-replay-warnings

What I missing?

I did several implementations like yours of Freeradius and learned a lot during that time. And I probably know what you are "missing" if I understood your question/problem correctly.

Here we go:

Your configuration looks fine.
However, authentication and accounting are two separate components of the Radius Protocol. The plugin/module you use pam-radius-auth only does authentication. The plugin/module does not have the capability to send Radius accounting packets.

If you check the following website of OpenVPN Plugin Overview, you will see in the plugin overview, the topic radiusplugin.
I used: ValdikSS openvpn-radiusplugin which worked for me at the time. It also had, still has I see, a nice readme with configuration examples. But I see there are more radius plugins available on the OpenVPN website, so check the plugins out and find the best one which suits your quality standards and needs.

Also a nice article that explains Radius Accounting: How does Radius accounting work

Good Luck!

Well, ok, I've found this patch https://github.com/ValdikSS/openvpn-radiusplugin/issues/14

And after recompiling accounting works, at least on Acc-Start. But on closing session from client there is no changes in DB. I have unclosed session in radius.