[SR-Users] SSL errors with websocket clients

[Vinicius Kwiecien Ruoso]

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 at 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 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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