Thanks Daniel and Ding Ma.

I have Certificate Authority, who signed the server certificate and client certificate. 

Server certificate and root CA is added to server. 

Client certificate and root CA is added to client.

Now CRL file path is update with server and it's own server certificate is revoked. In this case what should be kamailio server behavior, if any client wants to establish TLS connection? or Since it's own server certificate is revoked TLS should be disabled on server side?

As per my understanding, TLS should be disabled on server side, as it does not have valid certificate. Please share your thoughts on this.

Regards,

Amarnath

On Tue, Jul 3, 2018 at 5:22 PM Ding Ma <mading087@gmail.com> wrote:

The CRL with revoked server certificate needs to be loaded in the sip client. TLS server doesn’t send CRL to client during handshake.

Sent from my iPhone

On Jul 3, 2018, at 6:16 AM, Daniel-Constantin Mierla <miconda@gmail.com> wrote:

Hello,

haven't played with CRL lately, but kamailio should just call libssl functions for validating the certificates, after initializing the context with CRL file.

Maybe you can open an issue on github.com/kamailio/kamailio tracker, add there all log messages printed by kamailio with debug=3 in kamailio.cfg. In this way we do not forget about it and can be investigated properly.

Cheers,
Daniel

On 28.06.18 08:47, Amarnath Kanchivanam wrote:

Hi All,

I'm trying to configured kamailio as TLS server with below configuration (tls.cfg) and TLS server is started successfully.

[server:default]

method = TLSv1+

verify_certificate = yes

require_certificate = yes

private_key = ./sip/server.key

certificate = ./sip/server.crt

ca_list = ./bundle.crt

crl = ./sip_crl.pem

verify_depth = 9

[client:default]

verify_certificate = no

require_certificate = no

TLS connection works fine.

Later i have updated the sip_crl.pem with server certificate revoked details and performed tls.reload command to load the latest update. 

After this I expect any TLS client trying to establish TLS connection should fail, as the client and server certificates are signed by same authority and server certificate is revoked. But the clients are able to establish TLS connection without any errors.

I'm not getting any traces to confirm CRL validation has been performed before accepting the TLS connection. 

Any advice would be help to proceed with evaluating CRL functionality.

-Amar

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