[OpenSIPS-Users] TLS - How exactly decide to use require_cert equals to 1 or 0 ? The SIP client must trust the SIP server, not vice-versa.

[Rodrigo Pimenta Carvalho]

Great!

Thank you.


RODRIGO PIMENTA CARVALHO
Inatel Competence Center
Software
Ph: +55 35 3471 9200 RAMAL 979
________________________________
De: users-bounces at lists.opensips.org <users-bounces at lists.opensips.org> em nome de Podrigal, Aron <aronp at guaranteedplus.com>
Enviado: quarta-feira, 29 de julho de 2015 11:25
Para: OpenSIPS users mailling list
Assunto: Re: [OpenSIPS-Users] TLS - How exactly decide to use require_cert equals to 1 or 0 ? The SIP client must trust the SIP server, not vice-versa.

0 means  *do not* force the client to present a certificate where as 1 means *do* ask the client to present a cert.

rejected by client interprets as so, Opensips asks the client I need you to present a certificate and the client rejects that request.

Cheers.

On Wed, Jul 29, 2015 at 9:51 AM, Rodrigo Pimenta Carvalho <pimenta at inatel.br<mailto:pimenta at inatel.br>> wrote:

Dear OpenSIPS-users,


I am configuring my OpenSIPS 2.2 to communicate to SIP clients using TLS.  The SIP client must trust the SIP server, but the inverse is not needed. I want to avoid a fake SIP server collecting data from the SIP clients, for example collecting login/ID and passwords.


For that, I suspect that I must to use the configuration:  modparam("proto_tls","require_cert", "X"). But, what does exactly mean 1 or 0 for X?


When I use X equals to 0 and run the test "openssl s_client -showcerts -debug -connect <OpenSIPS_IP>:5061  -no_ssl2 -bugs -CAfile ./cacert.pem", I can see the following OpenSIPS log:


--------------------------------------------------------------------------------------------------------------

Jul 29 10:02:27 [11929] DBG:proto_tls:tls_conn_init: entered: Creating a whole new ssl connection
Jul 29 10:02:27 [11929] DBG:proto_tls:tls_conn_init: looking up socket based TLS server domain [<OpenSIPS_IP>:5061]
Jul 29 10:02:27 [11929] DBG:proto_tls:tls_find_server_domain: virtual TLS server domain not found, Using default TLS server domain settings
Jul 29 10:02:27 [11929] DBG:proto_tls:tls_conn_init: found socket based TLS server domain [0.0.0.0:0<http://0.0.0.0:0>]

...

...

Jul 29 10:02:27 [11921] INFO:proto_tls:tls_accept: New TLS connection from <OpenSIPS_IP>:45457 accepted
Jul 29 10:02:27 [11921] DBG:proto_tls:tls_accept: new TLS connection from <OpenSIPS_IP>:45457 using TLSv1/SSLv3 AES256-SHA 256
Jul 29 10:02:27 [11921] DBG:proto_tls:tls_accept: local socket: <OpenSIPS_IP>:5061
Jul 29 10:02:27 [11921] INFO:proto_tls:tls_accept: Client did not present a TLS certificate

...

...

Jul 29 10:02:31 [11929] DBG:proto_tls:tls_conn_shutdown: first phase of 2-way handshake completed succesfuly

-----------------------------------------------------------------------------------------------------------------------




However, when I use X equals to 1, I get:


--------------------------------------------------------------------------------------------------------------------------

Jul 29 10:05:36 [11978] ERROR:proto_tls:tls_accept: New TLS connection from <OpenSIPS_IP>:45460 failed to accept: rejected by client
Jul 29 10:05:36 [11978] ERROR:proto_tls:tls_read_req: failed to do pre-tls reading

--------------------------------------------------------------------------------------------------------------------------


So, It seems that the client refuses the connection from the server. What is happening here? Is the client refusing some cert presented by the server?

I'm a bit confused because the TLS Module documentation says that  'require_cert' parameter is used for incoming TLS connections, where OpenSIPS acts as server. So, how could it affect the client side?


P.S.: the result of "openssl s_client ..." command is "Verify return code: 0 (ok)".


Any hint will be very helpful!


Best regards.



RODRIGO PIMENTA CARVALHO
Inatel Competence CenterVerify return code: 0 (ok)
Software
Ph: +55 35 3471 9200<tel:%2B55%2035%203471%209200> RAMAL 979

_______________________________________________
Users mailing list
Users at lists.opensips.org<mailto:Users at lists.opensips.org>
http://lists.opensips.org/cgi-bin/mailman/listinfo/users




--
Aron Podrigal
-
'1000001', '1110010', '1101111', '1101110'   '1010000', '1101111', '1100100', '1110010', '1101001', '1100111', '1100001', '1101100'

P: '2b', '31', '33', '34', '37', '34', '35', '38', '36', '30', '39', '39'

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.opensips.org/pipermail/users/attachments/20150729/33b37008/attachment.htm>