Re: Enable SSLv3 in Postfix

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On 10/05/17 10:45, Samuel Sieb wrote:
> On 10/04/2017 04:15 PM, Nelson Crosby wrote:
>> Because Legacy Software, I need to be able to support SSLv3 on my
>> Postfix server. From what I can figure, however, this is disabled
>> in the SSL library itself, as I still cannot get a successful
>> handshake with the following configuration line, which seems to me
>> like it should be enough to enable it:
>>
>>      smtpd_tls_mandatory_protocols = !SSLv2
>
> Just speculating, but if SSLv3 is disabled by default in the library, this is not
> likely to work.  What happens if you put SSLv3 on that line instead?
>

FWIW, in examining the changelogs for openssl-libs it would appear that while SSv3 is
disabled by default it is designed such that an application can override the settings.

* Mon Jun 30 2014 Tomáš Mráz <tmraz@xxxxxxxxxx> 1.0.1h-5
- disable SSLv2 and SSLv3 protocols by default (can be enabled
  via appropriate SSL_CTX_clear_options() call)

So, it would seem to be a configuration issue or bug with postfix


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