[Xymon] Monitoring websites using TLS1.3

martin at savcom.co.uk martin at savcom.co.uk
Wed Mar 25 16:15:03 CET 2020

Thank you.  The Sni has worked.




From: Matthew Goebel <mgoebel at emich.edu> 
Sent: 25 March 2020 13:16
To: martin at savcom.co.uk
Cc: xymon at xymon.com
Subject: Re: [Xymon] Monitoring websites using TLS1.3


Try adding sni to your hosts.cfg line for that server.





On Wed, Mar 25, 2020 at 8:45 AM <martin at savcom.co.uk <mailto:martin at savcom.co.uk> > wrote:

I’m trying to monitor a website that is operated on part of Cloudflare’s setup and I am failing to get a positive result.  The website uses TLS1.3 and Xymonnet tells me that it was built USING OpenSSL v 1.1.0g (Xymon version 4.3.28) which only handles TLS variants 1.0, 1.1, and 1.2.


I’m monitoring the server using the hosts.cfg entry:     Website    # noconn nosslcert https3://www.website.com/ <http://www.website.com/> 


I’ve tried other httpsX variants and no joy.  The result I get from the website test is the rather sparse “- SSL error”

Digging into Xymonnet gives a more cryptic 
Unspecified SSL error in SSL_connect to https (47873/tcp) on host xx.xx.xx.xx: error:14094410:SSL routines:ssl3_read_bytes:sslv3 alert handshake failure
I’m assuming the issue is around the version of OpenSSL, as the OpenSSL v1.1.1 beta version manages TLS1.3 whereas OpenSSL v1.1.0g does not.
I have three questions:
-          Is there a way of setting Xymon up to manage this monitoring?
-          When is it planned to include OpenSSL v1.1.1 in a Xymon build?
-          In the meantime, is it worth writing a simple script to test the HTTPS response I need and feed this to Xymon separately?
Many thanks
Martin Davies

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Matthew Goebel : goebel at emunix.emich.edu <mailto:goebel at emunix.emich.edu>  : Unix Jockey @ EMU : Hail Eris
Neo-Student, Net Lurker, Donut consumer, and procrastinating medher...
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