Viktor Dukhovni via Postfix-users <[email protected]> writes:

> On Sat, Apr 11, 2026 at 11:01:33AM -0400, Wietse Venema via Postfix-users 
> wrote:
>
>> 20260323
>> 
>>      Feature: specify "tls_trust_server_ccerts = yes" to trust
>>      client certificates whose extended key usage (EKU) lists
>>      only serverAuth and not clientAuth as valid TLS client
>>      certificates. This parameter is used only in the Postfix
>>      SMTP server, when client certificates are requested via
>>      smtpd_tls_ask_ccert or smtpd_tls_req_ccert. It is a workaround
>>      for policy changes at the major WebPKI CAs that preclude
>>      the issuance of certificates with a clientAuth EKU. Viktor
>>      Dukhovni. Files: proto/postconf.proto, global/mail_params.h,
>>      tls/tls_misc.c, tls/tls_server.c.
>
> But do read the parameter documentation, often the right solution is to
> not trust CA-issued client certs at all.

Thanks for verification, Viktor and Wietse!


Sincerely, Byunghee

-- 
^고맙습니다 _布德天下_ 감사합니다_^))//

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