Hi all! How are you?
I have a kamailio instance and some users are having issues connecting via websocket using TLS. The logs show SSLv3 errors. Cannot find why that error would show up if SSLv2/3 is not enabled. Double checked it via SSLLabs that only TLSv1.2 is allowed in the service.
Error sample: ``` 15(36) ERROR: tls [tls_util.h:42]: tls_err_ret(): TLS accept:error:14094416:SSL routines:ssl3_read_bytes:sslv3 alert certificate unknown 15(36) ERROR: <core> [core/tcp_read.c:1512]: tcp_read_req(): ERROR: tcp_read_req: error reading - c: 0x7fafc8768190 r: 0x7fafc8768278 (-1) ```
This instance has close to 400 websocket connections opened during the day. I have a high log level enabled. I was not able to identify any reason why this happens. The certificate is a Letsencrypt certificate.
The issue is that sometimes clients have a hard time connecting to the websocket and that maybe related. Below are a few more details about the config. Please let me know if you have any pointers on how to debug those connection issues.
8<----- TLS config:
modparam("tls", "tls_method", "TLSv1.2+") modparam("tls", "verify_certificate", 0) modparam("tls", "require_certificate", 0) modparam("tls", "low_mem_threshold1", 0) modparam("tls", "low_mem_threshold2", 0) modparam("tls", "private_key", "/etc/certs/tls.key") modparam("tls", "certificate", "/etc/certs/tls.crt")
version: kamailio 5.3.9 (x86_64/linux) 8<-----
This is related to the issue https://github.com/kamailio/kamailio/issues/3085 (as pointed out it is not a problem in Kamailio code).
Thanks, Vinicius
Hello,
as pointed out before, the SSLv3 error message is misleading.
You need to be a bit more precise regarding your issue, "having a hard time" is a bit too vague. Did you already made some analysis if it happens only during a certain time of the day, or only certain clients etc..?
A bit of general advice, you could also consider doing an Kamailio update, 5.3.9 is end of life.
Cheers,
Henning
Hi Henning, How are you? Thanks for the fast reply.
I understand the report is vague (sorry), and that is the reason I'm asking for help. I don't see any other errors in the logs except the SSL errors, and as this happens sporadically (had happened two times only) during high connection numbers (over 400), I could not get more relevant information. The symptom is the browser not being able to open new connections. Restarting kamailio solves the issue, but that is a burden because it disrupts usage for a few minutes.
I'll take your advice and upgrade the version and keep a close eye on it.
Thanks, Vinicius
On Fri, Apr 22, 2022 at 11:50 AM Henning Westerholt hw@gilawa.com wrote:
Hello,
as pointed out before, the SSLv3 error message is misleading.
You need to be a bit more precise regarding your issue, "having a hard time" is a bit too vague. Did you already made some analysis if it happens only during a certain time of the day, or only certain clients etc..?
A bit of general advice, you could also consider doing an Kamailio update, 5.3.9 is end of life.
Cheers,
Henning
-- Henning Westerholt - https://skalatan.de/blog/ Kamailio services - https://gilawa.com
-----Original Message----- From: sr-users sr-users-bounces@lists.kamailio.org On Behalf Of Vinicius Kwiecien Ruoso Sent: Friday, April 22, 2022 4:14 PM To: Kamailio (SER) - Users Mailing List sr-users@lists.kamailio.org Subject: [SR-Users] SSL errors with websocket clients
Hi all! How are you?
I have a kamailio instance and some users are having issues connecting via websocket using TLS. The logs show SSLv3 errors. Cannot find why that error would show up if SSLv2/3 is not enabled. Double checked it via SSLLabs that only TLSv1.2 is allowed in the service.
Error sample:
15(36) ERROR: tls [tls_util.h:42]: tls_err_ret(): TLS accept:error:14094416:SSL routines:ssl3_read_bytes:sslv3 alert certificate unknown 15(36) ERROR: <core> [core/tcp_read.c:1512]: tcp_read_req(): ERROR: tcp_read_req: error reading - c: 0x7fafc8768190 r: 0x7fafc8768278 (-1) ``` This instance has close to 400 websocket connections opened during the day. I have a high log level enabled. I was not able to identify any reason why this happens. The certificate is a Letsencrypt certificate. The issue is that sometimes clients have a hard time connecting to the websocket and that maybe related. Below are a few more details about the config. Please let me know if you have any pointers on how to debug those connection issues. 8<----- TLS config: modparam("tls", "tls_method", "TLSv1.2+") modparam("tls", "verify_certificate", 0) modparam("tls", "require_certificate", 0) modparam("tls", "low_mem_threshold1", 0) modparam("tls", "low_mem_threshold2", 0) modparam("tls", "private_key", "/etc/certs/tls.key") modparam("tls", "certificate", "/etc/certs/tls.crt") version: kamailio 5.3.9 (x86_64/linux) 8<----- This is related to the issue https://github.com/kamailio/kamailio/issues/3085 (as pointed out it is not a problem in Kamailio code). Thanks, Vinicius __________________________________________________________ Kamailio - Users Mailing List - Non Commercial Discussions * sr-users@lists.kamailio.org Important: keep the mailing list in the recipients, do not reply only to the sender! Edit mailing list options or unsubscribe: * https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
-
Henning Westerholt -
Vinicius Kwiecien Ruoso