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Date: Mon, 3 Feb 2025 08:09:32 -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>
In-Reply-To: <GV0P278MB00997E04E572BE316E544B048BF52@GV0P278MB0099.CHEP278.PROD.OUTLOOK.COM>
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On 2/3/25 02:14, Zwettler Markus (OIZ) wrote:

>> bash-4.4$ cat pg_hba.conf
>> # Do not edit this file manually!
>> # It will be overwritten by Patroni!
>> local all "postgres" peer
>> hostssl replication "_crunchyrepl" all cert hostssl "postgres" "_crunchyrepl" all
>> cert host all "_crunchyrepl" all reject host all "ccp_monitoring" "127.0.0.0/8"
>> scram-sha-256 host all "ccp_monitoring" "::1/128" scram-sha-256 host all
>> "ccp_monitoring" all reject
>> hostssl all all all md5                                     <<== user connection matching this
>> line gives the error
>>
>>
> 
> 
> Seems that I found the root cause in the docs:
> "When clientcert is not specified, the server verifies the client certificate against its CA file only if a client certificate is presented and the CA is configured."
> https://www.postgresql.org/docs/17/ssl-tcp.html#SSL-CLIENT-CERTIFICATES
> a CA is configured on the server and the client presents a client certificate.
> 
> 
> Is it possible to configure "clientcert=disable" in pg_hba.conf or disable the client verification otherwise?
> The docs only mention "verify-ca" and "verify-full".
> "In addition to the method-specific options listed below, there is a method-independent authentication option clientcert, which can be specified in any hostssl record. This option can be set to verify-ca or verify-full."
> https://www.postgresql.org/docs/current/auth-pg-hba-conf.html
>

 From what I understand your client has to either not have the client 
certificates or create them correctly.

-- 
Adrian Klaver
adrian.klaver@aklaver.com