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Date: Fri, 31 Jan 2025 08:37:24 -0800
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Subject: Re: could not accept ssl connection tlsv1 alert unknown ca
To: "Zwettler Markus (OIZ)" <Markus.Zwettler@zuerich.ch>,
 Tom Lane <tgl@sss.pgh.pa.us>,
 "pgsql-general@lists.postgresql.org" <pgsql-general@lists.postgresql.org>
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From: Adrian Klaver <adrian.klaver@aklaver.com>
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On 1/31/25 00:57, Zwettler Markus (OIZ) wrote:
>> Von: Tom Lane <tgl@sss.pgh.pa.us>

>> Those cause some additional checks to be made, but it's not like you can expect a
>> completely broken certificate to work without them.
>>
>>                          regards, tom lane
> 
> 
> 
> I don't understand why Postgres does a certificate validation with “sslmode=prefer”. Postgres should simply ignore every presented client certificate here. Regardless of whether it is trusted or not.

What are the relevant lines in pg_hba.conf?

> 
> A certificate validation should only take place in the modes “sslmode=verify-ca” and “ssmode=verify-full”. Only here should Postgres refuse a connection with non-trusted certificates.
> 
> At least that's what I read in the documentation. No?
> 
> Regards, Markus
> 

-- 
Adrian Klaver
adrian.klaver@aklaver.com