dovecot 2.3.x, ECC and wildcard certificates, any issues

[ѽ҉ᶬḳ℠]

That is one of the reasons I do not bother since long with public CAs
but rather deploy my own, including own OSCP responder.

Which has of course has some drawbacks like redundancy, resilience,
bandwidth provision, geographical spread, implementing CA security
standards and CA trust in clients. Latter though could be easily
overcome if browser and email clients were to support DNSSEC/DANE
validation.

It may not help you in the short term now but perhaps something to
consider long term for the benefit of controlling the certificate
handling/signing, depending on the CA scale.

> Hello,
>
> I have discovered what I believe is the issue after hearing back from
> Aquamail. And that is that android 7 which I'm running 7.0 that is,
> only supports up to the p256 ecc curve. This brings up a question to
> users of letsencrypt, when you revoke a certificate does it take it
> out on the usage as well? I've got one domain that says i've issued to
> many certificates for it and no more can be issued, thought I was
> using the staging server. I'd like to get those certs off the
> letsencrypt servers so I can make a new one using the p256 curve. Does
> anyone know if this is doable? Using acme.sh I tried --revoke which
> revoked one cert but letsencrypt still would not let me issue another.
>
> Thanks.
> Dave.
>
>
> On 7/30/18, Aki Tuomi <aki.tuomi at dovecot.fi> wrote:
>> I don't know how to get both RSA and ECC cert from letsencrypt.
>>
>> Aki
>>
>>> On 30 July 2018 at 20:43 David Mehler <dave.mehler at gmail.com> wrote:
>>>
>>>
>>> Hello,
>>>
>>> What acme implementation do you use for your letsencrypt certificates?
>>> If it's acme.sh how do you get both rsa and ecc certificates? What
>>> configuration options are you using in your configuration of services
>>> to allow access to both rsa and ecc?
>>>
>>> Thanks.
>>> Dave.
>>>
>>>
>>> On 7/30/18, David Mehler <dave.mehler at gmail.com> wrote:
>>>> Hello,
>>>>
>>>> The client in question is the latest version of AquaMail running on
>>>> android.
>>>>
>>>> Thanks.
>>>> Dave.
>>>>
>>>>
>>>> On 7/30/18, Aki Tuomi <aki.tuomi at dovecot.fi> wrote:
>>>>> You should, in practice, enable both. This gives best client
>>>>> compability.
>>>>> It
>>>>> is possible you have clients that cannot understand ECC certificates?
>>>>> You
>>>>> can use ssl_alt_cert to provide RSA cert too.
>>>>>
>>>>> Aki
>>>>>
>>>>>> On 30 July 2018 at 20:05 David Mehler <dave.mehler at gmail.com> wrote:
>>>>>>
>>>>>>
>>>>>> Hi,
>>>>>>
>>>>>> Thanks, good news is that worked. Bad news is it all looks good which
>>>>>> means I do not know hwhy my remote clients can't get their email,
>>>>>> looked like from the logs it was that.
>>>>>>
>>>>>> Would 143 be better or 993 for the external clients?
>>>>>>
>>>>>> Thanks.
>>>>>> Dave.
>>>>>>
>>>>>>
>>>>>> On 7/30/18, Aki Tuomi <aki.tuomi at dovecot.fi> wrote:
>>>>>>>> On 30 July 2018 at 19:16 David Mehler <dave.mehler at gmail.com>
>>>>>>>> wrote:
>>>>>>>>
>>>>>>>>
>>>>>>>> Hello,
>>>>>>>>
>>>>>>>> Does dovecot 2.3.x have any issues recognizing or using
>>>>>>>> certificates
>>>>>>>> that are ECC and wildcard? I'm trying to switch my letsencrypt
>>>>>>>> implementation from acme-client which does not support either of
>>>>>>>> those
>>>>>>>> capabilities to acme.sh which does. Since then external clients
>>>>>>>> checking their email has not worked. A manual telnet to
>>>>>>>> mail.example.com 993 gives a connected message but then nothing no
>>>>>>>> greeting or capabilities.
>>>>>>>>
>>>>>>>> The certificate is for example.com with an alt name of
>>>>>>>> *.example.com
>>>>>>>> if that's not right let me know, i'm not sure about that one,
>>>>>>>> connecting to the web sites of these pages seems noticeably
>>>>>>>> slower,
>>>>>>>> I'm wondering if both of these issues aren't key related?
>>>>>>>>
>>>>>>>> Thanks.
>>>>>>>> Dave.
>>>>>>> These both should be fine.
>>>>>>>
>>>>>>> Port 993 is TLS encrypted, you should use openssl s_client -connect
>>>>>>> server:993
>>>>>>>
>>>>>>> Aki
>>>>>>>