Hi,

why not simply using a CRL file and revoke the unneeded certificate?

To debug the issue, I think we'll need some logs with 'verb 4' - at least
from the server side.

Cheers,

        Tom

-----Original Message-----
From: richard lucassen [mailto:mailingli...@lucassen.org] 
Sent: Thursday, April 16, 2020 12:02 PM
To: openvpn-users@lists.sourceforge.net
Subject: [Openvpn-users] crl-verify

Hello list,

Debian Buster, OpenVPN 2.4.0-6

In the man page there is an flag 'dir' to the option 'crl-verify':

<quote>
If the optional dir flag is specified, enable a different mode where crl is
a directory containing files named as revoked serial numbers (the files may
be empty, the contents are never read). If a client requests a connection,
where the client certificate serial number (decimal string) is the  name of
a file present in the directory, it will be rejected.
</quote>

Ok, here we go:

# grep crl-verify /etc/openvpn/server.conf crl-verify /etc/openvpn/crl dir

I'd like to block cert with serial number 0B:

# openssl x509 -noout -serial -in test.crt | \
  sed 's/.*=//g;s/../&:/g;s/:$//'
0B

AFAIU the manpage I only have to touch the file:

# touch /etc/openvpn/crl/0B

to prevent the cert with serial number 0B from connecting, but no way, I am
still able to connect using this cert with serial 0B.

Have I missed something crucial somwhere?

R.

--
richard lucassen
http://contact.xaq.nl/


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