[squid-users] SSL3_READ_BYTES:sslv3 alert certificate unknown

Yuri Voinov yvoinov at gmail.com
Wed Oct 28 14:09:44 UTC 2015

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It seems to me that all this functionality must be enabled by default in
the SSL proxies. As the base. Do not I have to wrestle with where (and
how) to take intermediate certificates. Or how to define an unknown CA root.

 A proxy.

At a minimum, it should write the information on them in the log - in an
understandable form - that I was not engaged in telepathic guessing and
did not use the method of Edison, turning over hundreds of log records.

28.10.15 19:55, Amos Jeffries пишет:
> On 28/10/2015 11:57 p.m., Yuri Voinov wrote:
>> 28.10.15 16:47, Amos Jeffries пишет:
>>> On 28/10/2015 11:35 p.m., Yuri Voinov wrote:
>>>> Hi gents.
>>>> I think, all of you who use Bump, seen much this messages in your
>>>> cache.log.
>>>> SSL3_READ_BYTES:sslv3 alert certificate unknown
>>>> AFAIK, no way to identify which CA is absent in your setup.
>>>> I propose to consider the following questions: how do properly support
>>>> SSL proxy, if you can not identify the problem certificates? Telepaths
>>>> sunbathing in Bali. The procedure, which currently can not quickly and
>>>> in any way to effectively determine such a certificate.
>>>> At the moment, the situation is as follows. SSL library - a thing in
>>>> itself, it runs by itself and does not write any logs. Squid - itself
>>>> and any useful information on the library does not receive but obscure
>>>> diagnostic messages. The possibility in any way specify the SSL library
>>>> diagnostic messages we have, and, as I understand it, will not.
>>>> So, any ideas?
>>> Make sure Squid is sending the whole CA chain to the remote end?
>> I think so, "From the remote end". If we have web-server with CA, which
>> is not exists on our proxy, we must install it (which means "trust
>> them", yea?) in our proxy manually.
>> I have idiotic idea - Squid fetch remote CA and offer us to trust and
>> install interactively. :) This is, of course, clinically idiotism. :)
> That is what the Browsers do. It has been suggested to write a cert
> validator that does it too.
>> But - to support real Squid installation with thoursands users, I really
>> want to know, which CA's not exists from my side.
>> Intermediate CA's is no matter - if we have root CA already, fetch
>> intermediate chain is not big problem.
>> In this case, however, we faced unknown root CA exactly.
>> Yes?
> I doubt. Chains do not have length limits and IIRC you can't know that
> it is a root CA until you actually have it and see that it is
> self-signed. At which point it is not "certificate unknown" anymore.
> What is missing is just some CA in the chain. It needs to be located
> somehow, only then can the decision happen about whether to trust or not
> and see if another up the chain is needed too.
>> And so what?
> So by walking the chain and filling in as needed the cert validator
> helper can probably fill the whole sequence in and reach a root CA that
> is already trusted and tells you the found ones can be too. That is what
> the Browsers do.
> Amos
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