Re: ssl_crl_file Certificate Revocation List doesn't work for postgresql 11

Hi.

At Thu, 2 Dec 2021 11:31:26 +0800, Yi Sun <yinan81@gmail.com> wrote in 
> Hi Kyotaro
> 
> From the description, seems  ~/.postgresql/root.crl  is store client
> revoked certificate

No.  Revocation is checked on the peer. There's no point for a server
to check for revocation of its own certificate, and actually that
doesn't happen. Revocation of a client certificate is checked on
server side referencing server.crl. Revocation of a server certificate
is checked on client side referencing postgresql.crl. For example,
some web browsers make use of CRL of web *servers*, which is
automatically maintained in background.

You will see it work if you duped the server.crl as
~/.postgresql/root.crl on the client.  (I spelled this wrongly in the
previous message..)

> https://www.postgresql.org/docs/11/libpq-ssl.html
> ~/.postgresql/root.crl certificates revoked by certificate authorities server
> certificate must not be on this list
> Just don't know why server parameter ssl_crl_file parameter configured but
> don't take affect

As explained above, it is because the CRL specified by ssl_crl_file
can only be used to verify client certificates.

> https://www.postgresql.org/docs/11/runtime-config-connection.html#GUC-SSL-CRL-FILE
> 
> ssl_crl_file (string)
> 
> Specifies the name of the file containing the SSL server certificate
> revocation list (CRL). Relative paths are relative to the data directory.
> This parameter can only be set in the postgresql.conf file or on the server
> command line. The default is empty, meaning no CRL file is loaded.

Ah, the "server" in "SSL server certificate revocation list" looks
like a noise word, rather misleading, or plain wrong, I'm not sure
which one it actually is.


Anyway I propose change the rephrase as "SSL client certification
revocation list" as attached.

regards.

-- 
Kyotaro Horiguchi
NTT Open Source Software Center