25 Oct
2012
25 Oct
'12
5:13 p.m.
Hi Kamal!
Are you familiar with SSL/TLS and certificates? With TLS the trust
between TLS server and TLS client is usually via a trusted certification
authority (CA). For example, if the intermediate proxy uses a
certificate which is issued by CA FOOBAR-XYZ, the you have to configure
Kamailio to accept certificates singed by FOOBAR-XYZ. This is done by
copying the public root certificate of FOOBAR-XYZ to the Kamailio server
and configure Kamailio to use the FOOBAR-XYZ certificate as trusted CA.
Of course then you automatically also trust all others certificates
issued by FOOBAR-XYZ.
To configure the trusted CAs use:
http://kamailio.org/docs/modules/3.3.x/modules/tls.html#ca_list
You could also disable the certificate validation with:
http://kamailio.org/docs/modules/3.3.x/modules/tls.html#verify_certificate
But of course this reduces TLS benefits to encryption-only.
regards
Klaus
On 22.10.2012 13:53, Kamal Palei wrote:
Dear All
I have modified kamailio,cfg and compiled all the modules with TLS
enabled, and able to bring up the kamailio proxy properly.
Kamailio proxy will receive the REGISTER message from endpoints in UDP ,
and want to send this REGISTER message to another intermediate proxy in
TLS. For this purpose, I have added few lines in kamailio.cfg file as below.
I have created the certificates, private keys as explained by README
file in kamailio-3.1.5/modules/tls/ path.
if(is_method("REGISTER"))
{
t_relay_to("tls:115.114.48.75:443
<http://115.114.48.75:443>");
exit();
}
Looks like this is taking effect. When Kamailio receives REGISTER
message it is trying to do handshake with intermediate proxy.
I used wireshark to see the handshake messages.
1. From Kamailio proxy, a TCP SYNC message is going to intermediate proxy.
2. intermediate proxy sends SYNC + ACK
3. Kamailio sends CLIENT HELLO
4. intermediate proxy sends SERVER HELLO, CERTIFICATE and SERVER HELLO DONE
5. The Kamailio sends ALERT (Level: Fatal, Description: Unknown CA)
---> IS something going wrong here..............
6. Then Kamailio sends FIN + ACK
Can somebody please let me know why the certificate verification fails
(I get this log in console).
How can I put a work around to avoid certification verification failure.
Best Regards
kamal
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