Openvpn
From DWIKI
HOWTO
Using easyrsa
https://community.openvpn.net/openvpn/wiki/EasyRSA3-OpenVPN-Howto
Revoke certificate
https://openvpn.net/community-resources/revoking-certificates/
If you don't want to restart openvpn after revoking a cert add to server config:
crl-verify crl.pem
./easyrsa revoke someclient ./easyrsa gen-crl
Check crl (TODO this is incorrect)
openssl crl -in -text pki/crl.pem
Check the serial numbers of the revoke certs
grep ^R pki/index.txt
You might need to copy crl.pem to /etc/openvpn/
cp ~/easy-rsa/pki/crl.pem /etc/openvpn
Renew expiry dates using easyrsa
./easyrsa gen-crl
and most likely
cp ~/easy-rsa/pki/crl.pem /etc/openvpn/
Push DNS to linux clients
http://blog.milford.io/2011/02/setting-up-an-openvpn-client-for-ubuntudebianmint-cli-edition/
echo "up /etc/openvpn/update-resolv-conf" >> ~/client/client.conf echo "down /etc/openvpn/update-resolv-conf" >> ~/client/client.conf
Openvpn and systemd
https://ubuntu.com/server/docs/service-openvpn
Update crl
openssl ca -gencrl -keyfile keys/ca.key -cert keys/ca.crt -out keys/crl.pem -config ./openssl.cnf
FAQ
NOTE: FlushIpNetTable failed on interface
This happens on windows, ignore it.
TLS Error: local/remote TLS keys are out of sync
First give it some time
WARNING: 'link-mtu' is used inconsistently
?
VERIFY ERROR: depth=0, error=CRL has expired
easyrsa gen-crl
and copy that to /etc/openvpn
