From: Tom Lane <tgl@sss.pgh.pa.us>
To: Yambu <hyambu@gmail.com>
cc: Pgsql-admin <pgsql-admin@lists.postgresql.org>
Subject: Re: change TLS version in postgres
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Comments: In-reply-to Yambu <hyambu@gmail.com>
	message dated "Sun, 20 Jun 2021 23:25:46 +0200"
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Yambu <hyambu@gmail.com> writes:
> I'm using postgres version 10, may i know how to change the tls version
> from 1.0 to a higher version?

If you have a new enough OpenSSL library, it should automatically
prefer more recent protocol versions.

If what you're concerned about is actively preventing use of lower
protocol versions, the only way to do that within PG itself is the
ssl_min_protocol_version setting, which exists in v12 and later.
However, you ought to be able to achieve the same effect by
adjusting the system-wide OpenSSL configuration: set
MinProtocol=TLSv1.2 in openssl.cnf (wherever that is on your
machine).  You might find your distro already did that, btw.

I am not sure, but it might be possible to use a private openssl
config file if you want to only affect Postgres and not other
daemons on the machine.  See the OpenSSL documentation.

			regards, tom lane