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

L. Daniel Burr ldanielburr at me.com
Mon Aug 31 09:57:36 MDT 2020


Hi John,

I think you want https://twistedmatrix.com/documents/20.3.0/api/twisted.internet.ssl.CertificateOptions.html <https://twistedmatrix.com/documents/20.3.0/api/twisted.internet.ssl.CertificateOptions.html>, specifically, you want to pass the "raiseMinimumTo" parameter,

Hope this helps,

L. Daniel Burr

> On Aug 31, 2020, at 10:47 AM, John Aherne <johnaherne at rocs.co.uk> wrote:
> 
>  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/>
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