[Twisted-Python] Block TLS 1.0 and TLS 1.1 support on windows
Glyph
glyph at twistedmatrix.com
Mon Aug 31 22:47:41 MDT 2020
Super glad you got this working!
However, what L. Daniel Burr suggested is correct - whether there's an existing ticket or not, the string endpoint should support all of these features.
(However, using pem is fine, too.)
-g
> On Aug 31, 2020, at 1:16 PM, John Aherne <johnaherne at rocs.co.uk> wrote:
>
> Thanks for looking all this up.
>
> I'd already decided to drop the endpoint server from string.
>
> So I'm using Hynek Schlaweck PEM package to build the certificate options.
>
> That seems to be working. Anyway I'm getting an A from Qualys at the moment having reset the _defaultMinimumTLSVersion back to its default of tlsv1_0 and passing the raiseMinimumTo as TLSVersion.TLS1_2
>
> Thanks for the pointers.
>
> John
>
>
>
> On Mon, Aug 31, 2020 at 7:26 PM L. Daniel Burr <ldanielburr at me.com <mailto:ldanielburr at me.com>> wrote:
> Hi John,
>
> I don't think you can accomplish it via a change to the description string, because serverFromString relies on the existing _parseSSL function is only passing the deprecated ssl method argument to CertificateOptions.
>
> I haven't tried this myself, but I think the solution is to provide your own plugin, implementing IPlugin and IStreamServerEndpointStringParser, e.g. "MyTLSParser" and use your own description string, e.g., "tls:443:raiseMinimumTo=...".
>
> Or maybe there's a ticket somewhere about updating the existing ssl description and parser to handle the new CertificateOptions arguments. That might be the right thing to implement.
>
> Hope this helps,
>
> L. Daniel Burr
>
>> On Aug 31, 2020, at 12:02 PM, John Aherne <johnaherne at rocs.co.uk <mailto:johnaherne at rocs.co.uk>> wrote:
>>
>> Thanks. That was quick.
>>
>> Just wondering how I can add that to my endpoint_description create serverfromstring.
>>
>> Or will I have to drop that.
>>
>> Let me take a look.
>>
>> Cheers
>>
>> John
>>
>> On Mon, Aug 31, 2020 at 4:58 PM L. Daniel Burr <ldanielburr at me.com <mailto:ldanielburr at me.com>> wrote:
>> 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 <mailto: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/>
>>> 020 7223 7567
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>>
>> --
>> John Aherne
>>
>>
>>
>> www.rocs.co.uk <http://www.rocs.co.uk/>
>> 020 7223 7567
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>
> --
> John Aherne
>
>
>
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