[Twisted-Python] Block TLS 1.0 and TLS 1.1 support on windows

[John Aherne]

 I'm using twisted 20.3 and python3.6.8 and Windows 10

I'm using endpoint_description with a tac file to start up a server.

But I need to disable tls 1.0 and 1.1.

I was hoping to find a parameter I could pass in to make the system only
recognise 1.2 and 1.3. But could not find anything that would do that. I
thought sslmethod would be what I wanted but that is limited to :

Must be one of: "SSLv23_METHOD", "SSLv2_METHOD", "SSLv3_METHOD",
"TLSv1_METHOD". If I choose TLSv1_METHOD, TLS1.0 and 1.1 are still enabled
and QUALYS complains and downgrades the rating to B
In the end I found _defaultMinimumTLSVersion in _sslverify.py.

I set this to TLSVersion.TLSv1_2 and that seemed to do the trick.

But I don't think I should be doing that. I think I've missed some obvious
place where I can pass in a value to change this.

Anyone  know where I should be looking.

Thanks for any info

-- 
*John Aherne*




*www.rocs.co.uk <http://www.rocs.co.uk>*
020 7223 7567
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