[SR-Users] SSL errors with websocket clients

[Henning Westerholt]

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 at 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 at 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

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